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1

Study of organic solar cells with stacked bulk heterojunction structure  

Science Journals Connector (OSTI)

Organic solar cells with stacked bulk heterojunction(BHJ) are investigated ... as inter-layer to connect the upper BHJ cell and the lower cell. The structures are ITO/PEDOT:PSS/MEH...V OC) of a st...

Xin-fang Zhang; Zheng Xu; Su-ling Zhao; Fu-jun Zhang; Yan Li…

2008-07-01T23:59:59.000Z

2

Recombination in polymer-fullerene bulk heterojunction solar cells  

Science Journals Connector (OSTI)

Recombination of photogenerated charge carriers in polymer bulk heterojunction (BHJ) solar cells reduces the short circuit current (Jsc) and the fill factor (FF). Identifying the mechanism of recombination is, therefore, fundamentally important for increasing the power conversion efficiency. Light intensity and temperature-dependent current-voltage measurements on polymer BHJ cells made from a variety of different semiconducting polymers and fullerenes show that the recombination kinetics are voltage dependent and evolve from first-order recombination at short circuit to bimolecular recombination at open circuit as a result of increasing the voltage-dependent charge carrier density in the cell. The “missing 0.3 V” inferred from comparison of the band gaps of the bulk heterojunction materials and the measured open-circuit voltage at room-temperature results from the temperature dependence of the quasi-Fermi levels in the polymer and fullerene domains—a conclusion based on the fundamental statistics of fermions.

Sarah R. Cowan; Anshuman Roy; Alan J. Heeger

2010-12-16T23:59:59.000Z

3

Bulk Heterojunction Polymer Solar Cells  

Science Journals Connector (OSTI)

Recent developments on bulk-heterojunction polymer photovoltaic diodes will be presented, focusing on the mechanism of charge generation, low bandgap polymers for increased photon...

Janssen, René

4

The influence of molecular orientation on organic bulk heterojunction...  

NLE Websites -- All DOE Office Websites (Extended Search)

The influence of molecular orientation on organic bulk heterojunction solar cells The influence of molecular orientation on organic bulk heterojunction solar cells Print Monday, 28...

5

Inorganic Nanocrystal Bulk Heterojunctions - Energy Innovation...  

NLE Websites -- All DOE Office Websites (Extended Search)

This Technology

Schematic illustration of a nanocrystal bulk heterojunction solar cell with an active layer in which the concentration of n-type and p-type nanocrystals is...

6

Solar Cells: Spin-Cast Bulk Heterojunction Solar Cells: A Dynamical...  

NLE Websites -- All DOE Office Websites (Extended Search)

Solar Cells: Spin-Cast Bulk Heterojunction Solar Cells: A Dynamical Investigation Solar Cells: Spin-Cast Bulk Heterojunction Solar Cells: A Dynamical Investigation Print Wednesday,...

7

Morphological Characterization of a LowBandgap Crystalline Polymer:PCBM Bulk Heterojunction Solar Cells  

NLE Websites -- All DOE Office Websites (Extended Search)

2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Full paper 1 wileyonlinelibrary.com Adv. Energy Mater. 2011, XX, 1-9 www.MaterialsViews.com www.advenergymat.de 1. Introduction Bulk heterojunction (BHJ) organic photovoltaic (OPV) sys- tems have attracted increasing interest due to their low-cost and potential for highly scalable solution processing. How- ever, achieving efficiencies in excess of 10% is an important milestone in making OPV devices viable economically. While there have been advances in the synthesis of novel low bandgap polymers and block copolymers with tailored morphologies, translating these advances to large scale production mandates understanding the morphology of the active layer developed during processing, the relationship of the

8

Organic hybrid planar-nanocrystalline bulk heterojunctions  

DOE Patents (OSTI)

A photosensitive optoelectronic device having an improved hybrid planar bulk heterojunction includes a plurality of photoconductive materials disposed between the anode and the cathode. The photoconductive materials include a first continuous layer of donor material and a second continuous layer of acceptor material. A first network of donor material or materials extends from the first continuous layer toward the second continuous layer, providing continuous pathways for conduction of holes to the first continuous layer. A second network of acceptor material or materials extends from the second continuous layer toward the first continuous layer, providing continuous pathways for conduction of electrons to the second continuous layer. The first network and the second network are interlaced with each other. At least one other photoconductive material is interspersed between the interlaced networks. This other photoconductive material or materials has an absorption spectra different from the donor and acceptor materials.

Forrest, Stephen R. (Ann Arbor, MI); Yang, Fan (Piscataway, NJ)

2011-03-01T23:59:59.000Z

9

Organic hybrid planar-nanocrystalline bulk heterojunctions  

DOE Patents (OSTI)

A photosensitive optoelectronic device having an improved hybrid planar bulk heterojunction includes a plurality of photoconductive materials disposed between the anode and the cathode. The photoconductive materials include a first continuous layer of donor material and a second continuous layer of acceptor material. A first network of donor material or materials extends from the first continuous layer toward the second continuous layer, providing continuous pathways for conduction of holes to the first continuous layer. A second network of acceptor material or materials extends from the second continuous layer toward the first continuous layer, providing continuous pathways for conduction of electrons to the second continuous layer. The first network and the second network are interlaced with each other. At least one other photoconductive material is interspersed between the interlaced networks. This other photoconductive material or materials has an absorption spectra different from the donor and acceptor materials.

Forrest, Stephen R.; Yang, Fan

2013-04-09T23:59:59.000Z

10

Material Profile Influences in Bulk-Heterojunctions  

SciTech Connect

he morphology in mixed bulk-heterojunction films are compared using three different quantitative measurement techniques. We compare the vertical composition changes using high-angle annular dark-field scanning transmission electron microscopy with electron tomography and neutron and x-ray reflectometry. The three measurement techniques yield qualita-tively comparable vertical concentration measurements. The presence of a metal cathode during thermal annealing is observed to alter the fullerene concentration throughout the thickness of the film for all measurements. However, the abso-lute vertical concentration of fullerene is quantitatively different for the three measurements. The origin of the quantitative measurement differences is discussed. The authors thank Luna Innovations, Inc. for donating the endohedral fullerenes used in this study and Plextronics for the P3HT. They are gratefully thank the National Science Foundation Energy for Sustainability Program, Award No. 0933435. This work benefited from the use of the Lujan Neutron Scattering Center at Los Alamos Neutron Science Center funded by the DOE Office of Basic Energy Sciences and Los Alamos National Laboratory under DOE Contract DE-AC52-06NA25396. This research was also supported in part by Laboratory Directed Research & Development program at PNNL. The Pacific Northwest National Laboratory is operated by Battelle for the US Department of Energy under contract DE-AC05-76RL01830.

Roehling, John D.; Rochester, Christopher W.; Ro, Hyun W.; Wang, Peng; Majewski, Jaroslaw; Batenburg, Kees J.; Arslan, Ilke; Delongchamp, Dean M.; Moule, Adam J.

2014-10-01T23:59:59.000Z

11

MORPHOLOGY DEPENDENT SHORT CIRCUIT CURRENT IN BULK HETEROJUNCTION SOLAR CELL  

E-Print Network (OSTI)

a relatively inexpensive option for the future solar cell technology, provided its efficiency increases beyondMORPHOLOGY DEPENDENT SHORT CIRCUIT CURRENT IN BULK HETEROJUNCTION SOLAR CELL Biswajit Ray, Pradeep, West Lafayette, Indiana, USA ABSTRACT Polymer based bulk heterostructure (BH) solar cell offers

Alam, Muhammad A.

12

Solution processable organic polymers and small molecules for bulk?heterojunction solar cells: A review  

Science Journals Connector (OSTI)

Solution processed bulk heterojunction (BHJ) organic solar cells (OSCs) have gained wide interest in past few years and are established as one of the leading next generation photovoltaic technologies for low cost power production. Power conversion efficiencies up to 6% and 6.5% have been reported in the literature for single layer and tandem solar cells respectively using conjugated polymers. A recent record efficiency about 8.13% with active area of 1.13 cm 2 has been reported. However Solution processable small molecules have been widely applied for photovoltaic (PV) devices in recent years because they show strong absorption properties and they can be easily purified and deposited onto flexible substrates at low cost. Introducing different donor and acceptor groups to construct donor—acceptor (D—A) structure small molecules has proved to be an efficient way to improve the properties of organic solar cells (OSCs). The power conversion efficiency about 4.4 % has been reported for OSCs based on the small molecules. This review deals with the recent progress of solution processable D—A structure small molecules and discusses the key factors affecting the properties of OSCs based on D—A structure small molecules: sunlight absorption charge transport and the energy level of the molecules.

G. D. Sharma

2011-01-01T23:59:59.000Z

13

Method of fabricating an optoelectronic device having a bulk heterojunction  

DOE Patents (OSTI)

A method of fabricating an optoelectronic device comprises: depositing a first layer having protrusions over a first electrode, in which the first layer comprises a first organic small molecule material; depositing a second layer on the first layer such that the second layer is in physical contact with the first layer; in which the smallest lateral dimension of the protrusions are between 1 to 5 times the exciton diffusion length of the first organic small molecule material; and depositing a second electrode over the second layer to form the optoelectronic device. A method of fabricating an organic optoelectronic device having a bulk heterojunction is also provided and comprises: depositing a first layer with protrusions over an electrode by organic vapor phase deposition; depositing a second layer on the first layer where the interface of the first and second layers forms a bulk heterojunction; and depositing another electrode over the second layer.

Shtein, Max (Ann Arbor, MI); Yang, Fan (Princeton, NJ); Forrest, Stephen R. (Princeton, NJ)

2008-10-14T23:59:59.000Z

14

Sputtered Nickel Oxide Thin Film for Efficient Hole Transport Layer in Polymer-Fullerene Bulk-Heterojunction Organic Solar Cell  

SciTech Connect

Bulk-heterojunction (BHJ) organic photovoltaics (OPV) are very promising thin film renewable energy conversion technologies due to low production cost by high-throughput roll-to-roll manufacturing, an expansive list of compatible materials, and flexible device fabrication. An important aspect of OPV device efficiency is good contact engineering. The use of oxide thin films for this application offers increased design flexibility and improved chemical stability. Here we present our investigation of radio frequency magnetron sputtered nickel oxide (NiO{sub x}) deposited from oxide targets as an efficient, easily scalable hole transport layer (HTL) with variable work-function, ranging from 4.8 to 5.8 eV. Differences in HTL work-function were not found to result in statistically significant changes in open circuit voltage (V{sub oc}) for poly(3-hexylthiophene):[6,6]-phenyl-C{sub 61}-butyric acid methyl ester (P3HT:PCBM) BHJ device. Ultraviolet photoemission spectroscopy (UPS) characterization of the NiO{sub x} film and its interface with the polymer shows Fermi level alignment of the polymer with the NiO{sub x} film. UPS of the blend also demonstrates Fermi level alignment of the organic active layer with the HTL, consistent with the lack of correlation between V{sub oc} and HTL work-function. Instead, trends in j{sub sc}, V{sub oc}, and thus overall device performance are related to the surface treatment of the HTL prior to active layer deposition through changes in active layer thickness.

Widjonarko, N. E.; Ratcliff, E. L.; Perkins, C. L.; Sigdel, A. K.; Zakutayev, A.; Ndione, P. F.; Gillaspie, D. T.; Ginley, D. S.; Olson, D. C.; Berry, J. J.

2012-03-01T23:59:59.000Z

15

Detailed balance theory of excitonic and bulk heterojunction solar cells  

Science Journals Connector (OSTI)

A generalized solar cell model for excitonic and classical bipolar solar cells describes the combined transport and interaction of electrons, holes, and excitons in accordance with the principle of detailed balance. Conventional inorganic solar cells, single-phase organic solar cells and bulk heterojunction solar cells, i.e., nanoscale mixtures of two organic materials, are special cases of this model. For high mobilities, the compatibility with the principle of detailed balance ensures that our model reproduces the Shockley-Queisser limit irrespective of how the energy transport is achieved. For less ideal devices distinct differences become visible between devices that are described by linear differential equations and those with nonlinear effects, such as a voltage-dependent collection in bipolar p-i-n-type devices. These differences in current-voltage characteristics are also decisive for the validity of the reciprocity theorem between photovoltaic quantum efficiency and electroluminescent emission. Finally, we discuss the effect of band offset at the heterointerface in a bulk heterojunction cell and the effect of the average distances between these heterointerfaces on the performance of a solar cell in order to show how our detailed balance model includes also these empirically important quantities.

Thomas Kirchartz; Julian Mattheis; Uwe Rau

2008-12-29T23:59:59.000Z

16

Method of fabricating an optoelectronic device having a bulk heterojunction  

DOE Patents (OSTI)

A method of fabricating an organic optoelectronic device having a bulk heterojunction comprises the steps of: depositing a first layer over a first electrode by organic vapor phase deposition, wherein the first layer comprises a first organic small molecule material; depositing a second layer on the first layer such that the second layer is in physical contact with the first layer, wherein the interface of the second layer on the first layer forms a bulk heterojunction; and depositing a second electrode over the second layer to form the optoelectronic device. In another embodiment, a first layer having protrusions is deposited over the first electrode, wherein the first layer comprises a first organic small molecule material. For example, when the first layer is an electron donor layer, the first electrode is an anode, the second layer is an electron acceptor layer, and the second electrode is a cathode. As a further example, when the first layer is an electron acceptor layer, the first electrode is a cathode, the second layer is an electron donor layer, and the second electrode is an anode.

Shtein, Max (Princeton, NJ); Yang, Fan (Princeton, NJ); Forrest, Stephen R. (Princeton, NJ)

2008-09-02T23:59:59.000Z

17

Processing Additives for Improved Efficiency from Bulk Heterojunction Solar Cells  

Science Journals Connector (OSTI)

Add to ACS ChemWorx ... Herein, we clarify the mechanism by which processing additives control the morphology, and using the insight provided by the mechanism, we identify an entire class of processing additives which yields still higher efficiency solar cells than those fabricated with 1,8-octanedithiol as the processing additive. ... AFM images of the BHJ films processed with the additive exhibit larger interconnected regions of PCPDTBT and larger porous domains (the C71-PCBM regions prior to selective removal) compared with images of the BHJ film cast without using the processing additive. ...

Jae Kwan Lee; Wan Li Ma; Christoph J. Brabec; Jonathan Yuen; Ji Sun Moon; Jin Young Kim; Kwanghee Lee; Guillermo C. Bazan; Alan J. Heeger

2008-02-21T23:59:59.000Z

18

Influence of organic salt concentration on the performance of bulk heterojunction organic solar cell  

Science Journals Connector (OSTI)

The effect of organic salt on the performance of bulk heterojunction organic solar cell was investigated by varying the concentration of...6). Organic solar cells based on TBAPF6-blended poly[2-methoxy-5-(2-ethyl...

Nasehah Syamin Sabri; Chi Chin Yap…

2013-07-01T23:59:59.000Z

19

Effect of Contacts in Organic Bulk Heterojunction Solar Cells  

Science Journals Connector (OSTI)

Interfaces play an important role in emerging organic electronic applications. In order to optimize and control the performance in organic devices such as organic solar cells, a comprehensive understanding of the contacts is essential. However, despite the vast progress made, a fundamental theory of the physical processes taking place at the contacts is still lacking. In this work, a numerical device model is used to clarify the effect of imperfect contacts in organic bulk heterojunction solar cells. The effect of increased injection barriers, reduced surface recombination, interfacial minority carrier doping, and traps for majority carriers at the electrodes causing reduced efficiencies is simulated. Two distinctly different underlying mechanisms leading to different S-shaped features are found, both leading to an effective shift of the built-in voltage. In the case of an extraction barrier to majority carriers at the contact, such as reduced surface recombination, the S kink is due to an induced diffusion potential. In the case of interfacial doping or traps, the S kink results from band bending caused by the fixed or trapped space charge. We derive analytical expressions describing the effective reduction of the built-in voltage and the (effective) open-circuit voltage providing means to quantify and distinguish the mechanisms. We show how to experimentally differentiate between these effects and provide tools to extract the relevant physical parameters.

Oskar J. Sandberg; Mathias Nyman; Ronald Österbacka

2014-03-27T23:59:59.000Z

20

P3HT:PCBM Bulk Heterojunction Organic Solar Cell.  

E-Print Network (OSTI)

?? Organic solar cells have emerged as an important cheap photovoltaic technology. In this thesis work, a study of P3HT:PCBM heterojunction solar cells was presented.… (more)

Liu, Jiang

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Mechanism of Recombination Losses in Bulk Heterojunction P3HT:PCBM Solar Cells Studied Using Intensity Modulated Photocurrent Spectroscopy  

Science Journals Connector (OSTI)

Mechanism of Recombination Losses in Bulk Heterojunction P3HT:PCBM Solar Cells Studied Using Intensity Modulated Photocurrent Spectroscopy ... † Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada ...

Joshua C. Byers; Scott Ballantyne; Konstantin Rodionov; Alex Mann; O. A. Semenikhin

2011-02-07T23:59:59.000Z

22

Photocurrent in bulk heterojunction solar cells with similar electron and hole mean free path  

SciTech Connect

We present photocurrents at several temperatures carried out in a bulk heterojunction photovoltaic device. To explain the results, we developed an analytical model assuming non-injecting contacts and equal mean free paths for electrons and holes. The fitting of the equation to the experimental data provided the temperature evolution of the charge transfer state dissociation probability (P) and ??, where ? is the charge carrier mobility and ? is the charge carrier lifetime. The photocurrent expression tends towards a saturation value of eGPL for high electric fields, where GP is the generation rate of charge carriers.

Coutinho, Douglas José; Faria, Roberto Mendonça, E-mail: faria@ifsc.usp.br [Instituto de Física de São Carlos, Universidade de São Paulo, C.P. 369, 13560-970 São Carlos, SP (Brazil)

2013-11-25T23:59:59.000Z

23

Relationship between energetic disorder and open-circuit voltage in bulk heterojunction organic solar cells  

Science Journals Connector (OSTI)

We simulate organic bulk heterojunction solar cells. The effects of energetic disorder are incorporated through a Gaussian or exponential model of density of states. Analytical models of open-circuit voltage (VOC) are derived from the splitting of quasi-Fermi potentials. Their predictions are backed up by more complex numerical device simulations including effects such as carrier-density–dependent charge-carrier mobilities. It is predicted that the VOC depends on: (1) the donor-acceptor energy gap; (2) charge-carrier recombination rates; (3) illumination intensity; (4) the contact work functions (if not in the pinning regime); and (5) the amount of energetic disorder. A large degree of energetic disorder, or a high density of traps, is found to cause significant reductions in VOC. This can explain why VOC is often less than expected in real devices. Energetic disorder also explains the nonideal temperature and intensity dependence of VOC and the superbimolecular recombination rates observed in many real bulk heterojunction solar cells.

James C. Blakesley and Dieter Neher

2011-08-12T23:59:59.000Z

24

Modeling and Optimization of Polymer based Bulk Heterojunction (BH) Solar cell * Biswajit Ray, Pradeep R. Nair, R. Edwin Garca1  

E-Print Network (OSTI)

of the morphology can double the efficiency of BH cells. 1. Introduction Polymer based organic solar cell remains/devices of organic cells to achievable efficiency. The cartoon of a BH solar cell in Fig. 1a illustrates four keyModeling and Optimization of Polymer based Bulk Heterojunction (BH) Solar cell * Biswajit Ray

Alam, Muhammad A.

25

Nanostructured electrodes for organic bulk heterojunction solar cells: Model study using carbon nanotube dispersed polythiophene-fullerene  

E-Print Network (OSTI)

Nanostructured electrodes for organic bulk heterojunction solar cells: Model study using carbon for organic pseudo-bilayer solar cells J. Appl. Phys. 112, 084511 (2012) Addition of regiorandom poly(3 (2012) Tunable open-circuit voltage in ternary organic solar cells Appl. Phys. Lett. 101, 163302 (2012

Hone, James

26

Solvent polarity and nanoscale morphology in bulk heterojunction organic solar cells: A case study  

SciTech Connect

Organic bulk heterojunction solar cells were fabricated under identical experimental conditions, except by varying the solvent polarity used for spin coating the active layer components and their performance was evaluated systematically. Results showed that presence of nitrobenzene-chlorobenzene composition governs the morphology of active layer formed, which is due to the tuning of solvent polarity as well as the resulting solubility of the P3HT:PCBM blend. Trace amount of nitrobenzene favoured the formation of better organised P3HT domains, as evident from conductive AFM, tapping mode AFM and surface, and cross-sectional SEM analysis. The higher interfacial surface area thus generated produced cells with high efficiency. But, an increase in the nitrobenzene composition leads to a decrease in cell performance, which is due to the formation of an active layer with larger size polymer domain networks with poor charge separation possibility.

Thomas, Ajith [Centre for Nano-Bio-Polymer Science and Technology, Department of Physics, St. Thomas College, Pala, Kerala 686574 (India); Research and Development Centre, Bharathiar University, Coimbatore, Tamilnadu 641046 (India); Elsa Tom, Anju; Ison, V. V., E-mail: isonvv@yahoo.in, E-mail: praveen@materials.iisc.ernet.in [Centre for Nano-Bio-Polymer Science and Technology, Department of Physics, St. Thomas College, Pala, Kerala 686574 (India); Rao, Arun D.; Varman, K. Arul; Ranjith, K.; Ramamurthy, Praveen C., E-mail: isonvv@yahoo.in, E-mail: praveen@materials.iisc.ernet.in [Department of Materials Engineering, Indian Institute of Science Bangalore, Karnataka 560012 (India); Vinayakan, R. [Department of Chemistry, SVR NSS College Vazhoor, Kerala 686505 (India)

2014-03-14T23:59:59.000Z

27

A C70-carbon nanotube complex for bulk heterojunction photovoltaic cells  

SciTech Connect

A C70 fullerene-multi-walled carbon nanotube (C70-CNT) complex has been used as a component of the photoactive layer in a bulk heterojunction photovoltaic cell. As compared to a control device with only C70, the addition of CNTs led to improvements in short circuit current density (J{sub sc}), open circuit voltage (V{sub oc}), and power conversion efficiency by 31.8, 17.5, and 69.5%, respectively. This device takes advantage of both the electron accepting feature of C70 and the high electron transport capability of CNTs. These results indicate that C70 decorated CNT is a promising additive for performance enhancement of polymer photovoltaic cells.

Lau, Xinbo C.; Wang, Zhiqian; Mitra, Somenath, E-mail: Somenath.Mitra@njit.edu [Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102 (United States)] [Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102 (United States)

2013-12-09T23:59:59.000Z

28

Polymer defect states modulate open-circuit voltage in bulk-heterojunction solar cells  

SciTech Connect

Defect states influence the operation of organic solar cells altering transport, recombination, and energetic mechanisms. This work investigates how processing conditions induce morphology-related, electrically active defects in the donor polymer of bulk-heterojunction solar cells. Structural order is inferred from absorption and X-ray diffraction data, while defect density is determined from capacitance methods. A correlation is observed between the polymer nanocrystallite size, the defect concentration, and the output voltage. For the case of poly(3-hexylthiophene), processing that promote crystallinity is beneficial for the device performance as it decreases the defect density (energy disorder) that finally enlarges the maximum achievable open-circuit voltage. Defect states within the effective bandgap modulate the downshift of the hole Fermi level upon illumination that in turn establishes the achievable open-circuit voltage.

Ripolles, Teresa S.; Guerrero, Antonio; Garcia-Belmonte, Germà, E-mail: garciag@uji.es [Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló (Spain)] [Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló (Spain)

2013-12-09T23:59:59.000Z

29

Effect of organic salt doping on the performance of single layer bulk heterojunction organic solar cell  

SciTech Connect

The effect of organic salt, tetrabutylammonium hexafluorophosphate (TBAPF{sub 6}) doping on the performance of single layer bulk heterojunction organic solar cell with ITO/MEHPPV:PCBM/Al structure was investigated where indium tin oxide (ITO) was used as anode, poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEHPPV) as donor, (6,6)-phenyl-C61 butyric acid methyl ester (PCBM) as acceptor and aluminium (Al) as cathode. In contrast to the undoped device, the electric field-treated device doped with TBAPF{sub 6} exhibited better solar cell performance under illumination with a halogen projector lamp at 100 mW/cm{sup 2}. The short circuit current density and the open circuit voltage of the doped device increased from 0.54 {mu}A/cm{sup 2} to 6.41 {mu}A/cm{sup 2} and from 0.24 V to 0.50 V, respectively as compared to those of the undoped device. The significant improvement was attributed to the increase of built-in electric field caused by accumulation of ionic species at the active layer/electrode interfaces. (author)

Yap, C.C.; Yahaya, M. [School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor (Malaysia); Salleh, M.M. [Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor (Malaysia)

2011-01-15T23:59:59.000Z

30

Ferroelectric field effect of the bulk heterojunction in polymer solar cells  

SciTech Connect

A ferroelectric field effect in the bulk heterojunction was found when an external electric field (EEF) was applied on the active layer of polymer solar cells (PSCs) during the annealing process of the active layer spin-coated with poly(3-hexylthiophene):[6,6]-phenyl-C{sub 61} butyric acid methyl ester. For one direction field, the short circuit current density of PSCs was improved from 7.2 to 8.0?mA/cm{sup 2}, the power conversion efficiency increased from 2.4% to 2.8%, and the incident photon-to-current conversion efficiency increased from 42% to 49% corresponding to the different EEF magnitude. For an opposite direction field, the applied EEF brought a minus effect on the performance mentioned above. EEF treatment can orientate molecular ordering of the polymer, and change the morphology of the active layer. The authors suggest a explanation that the ferroelectric field has been built in the active layer, and therefore it plays a key role in PSCs system. A needle-like surface morphology of the active film was also discussed.

Li, Meng; Ma, Heng, E-mail: hengma@henannu.edu.cn; Liu, Hairui; Jiang, Yurong [College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007 (China); Henan Key Laboratory of Photovoltaic Materials, Xinxiang 453007 (China); Niu, Heying; Amat, Adil [College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007 (China)

2014-06-23T23:59:59.000Z

31

Efficient solution-processed small molecule: Cadmium selenide quantum dot bulk heterojunction solar cells  

SciTech Connect

We report bulk heterojunction solar cells based on blends of solution-processed small molecule [7,7?-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b?]dithiophene-2,6-diyl) bis(6-fluoro-4-(5?-hexyl-[2,2?-bithiophen]-5yl)benzo[c] [1,2,5] thiadiazole)] p-DTS(FBTTh{sub 2}){sub 2}: Cadmium Selenide (CdSe) (70:30, 60:40, 50:50, and 40:60) in the device configuration: Indium Tin Oxide /poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/p-DTS(FBTTh{sub 2}){sub 2}: CdSe/Ca/Al. The optimized ratio of p-DTS(FBTTh{sub 2}){sub 2}:CdSe::60:40 leads to a short circuit current density (J{sub sc})?=?5.45?mA/cm{sup 2}, open circuit voltage (V{sub oc})?=?0.727?V, and fill factor (FF)?=?51%, and a power conversion efficiency?=?2.02% at 100 mW/cm{sup 2} under AM1.5G illumination. The J{sub sc} and FF are sensitive to the ratio of p-DTS(FBTTh{sub 2}){sub 2}:CdSe, which is a crucial factor for the device performance.

Gupta, Vinay, E-mail: drvinaygupta@netscape.net [Physics of Energy Harvesting Division, Organic and Hybrid Solar Cell Group, CSIR-National Physical Laboratory, New Delhi-110012 (India) [Physics of Energy Harvesting Division, Organic and Hybrid Solar Cell Group, CSIR-National Physical Laboratory, New Delhi-110012 (India); Department of Physics, University of California, Santa Barbara, California 93106 (United States); Upreti, Tanvi; Chand, Suresh [Physics of Energy Harvesting Division, Organic and Hybrid Solar Cell Group, CSIR-National Physical Laboratory, New Delhi-110012 (India)] [Physics of Energy Harvesting Division, Organic and Hybrid Solar Cell Group, CSIR-National Physical Laboratory, New Delhi-110012 (India)

2013-12-16T23:59:59.000Z

32

Carrier recombination flux in bulk heterojunction polymer:fullerene solar cells: Effect of energy disorder on ideality factor  

Science Journals Connector (OSTI)

Energy disorder reduces the achievable open-circuit voltage in organic bulk-heterojunction solar cells. Here the effect of disorder on charge carrier recombination flux is numerically modeled. The recombination current follows an exponential dependence on voltage (Fermi level splitting) parameterized by ? (inverse of the diode ideality factor), which reduces the power conversion efficiency through lower fill factors. ?-Parameter approaches unity (Boltzmann approximation) at room temperature only in the case of weak disorder (? ? 50 meV). For larger disorder values (? ? 100 meV) usually encountered in real devices, a huge reduction in ? (open-circuit voltage, and fill factor) is predicted following a relationship as ? ? ln ??1.

Germà Garcia-Belmonte

2013-01-01T23:59:59.000Z

33

Spin signatures of photogenerated radical anions in polymer-[70] fullerene bulk-heterojunctions : high-frequency pulsed EPR spectroscopy.  

SciTech Connect

Charged polarons in thin films of polymer-fullerene composites are investigated by light-induced electron paramagnetic resonance (EPR) at 9.5 GHz (X-band) and 130 GHz (D-band). The materials studied were poly(3-hexylthiophene) (PHT), [6,6]-phenyl-C61-butyric acid methyl ester (C{sub 60}-PCBM), and two different soluble C{sub 70}-derivates: C{sub 70}-PCBM and diphenylmethano[70]fullerene oligoether (C{sub 70}-DPM-OE). The first experimental identification of the negative polaron localized on the C{sub 70}-cage in polymer-fullerene bulk heterojunctions has been obtained. When recorded at conventional X-band EPR, this signal is overlapping with the signal of the positive polaron, which does not allow for its direct experimental identification. Owing to the superior spectral resolution of the high frequency D-band EPR, we were able to separate light-induced signals from P{sup +} and P{sup -} in PHT-C{sub 70} bulk heterojunctions. Comparing signals from C{sub 70}-derivatives with different side-chains, we have obtained experimental proof that the polaron is localized on the cage of the C{sub 70} molecule.

Poluektov, O. G.; Filippone, S.; Martin, N.; Sperlich, A.; Deibel, C.; Dyakonov, V. (Chemical Sciences and Engineering Division); (Univ. Complutense de Madrid); (Univ. of Wurzburg)

2010-01-01T23:59:59.000Z

34

Spin Signatures of Photogenerated Radical Anions in Polymer-[70]Fullerene Bulk Heterojunctions: High Frequency Pulsed EPR Spectroscopy  

E-Print Network (OSTI)

Charged polarons in thin films of polymer-fullerene composites are investigated by light-induced electron paramagnetic resonance (EPR) at 9.5 GHz (X-band) and 130 GHz (D-band). The materials studied were poly(3-hexylthiophene) (PHT), [6,6]-phenyl-C61-butyric acid methyl ester (C60-PCBM), and two different soluble C70-derivates: C70-PCBM and diphenylmethano[70]fullerene oligoether (C70-DPM-OE). The first experimental identification of the negative polaron localized on the C70-cage in polymer-fullerene bulk heterojunctions has been obtained. When recorded at conventional X-band EPR, this signal is overlapping with the signal of the positive polaron, which does not allow for its direct experimental identification. Owing to the superior spectral resolution of the high frequency D-band EPR, we were able to separate light-induced signals from P+ and P- in PHT-C70 bulk heterojunctions. Comparing signals from C70-derivatives with different side-chains, we have obtained experimental proof that the polaron is localized on the cage of the C70 molecule.

Oleg G. Poluektov; Salvatore Filippone; Nazario Martin; Andreas Sperlich; Carsten Deibel; Vladimir Dyakonov

2011-10-07T23:59:59.000Z

35

Spin Signatures of Photogenerated Radical Anions in Polymer?[70]Fullerene Bulk Heterojunctions: High Frequency Pulsed EPR Spectroscopy  

SciTech Connect

Charged polarons in thin films of polymer?fullerene composites are investigated by light-induced electron paramagnetic resonance (EPR) at 9.5 GHz (X-band) and 130 GHz (D-band). The materials studied were poly(3-hexylthiophene) (PHT), [6,6]-phenyl-C61-butyric acid methyl ester (C{sub 60}-PCBM), and two different soluble C{sub 70}-derivates: C{sub 70}-PCBM and diphenylmethano[70]fullerene oligoether (C{sub 70}-DPM-OE). The first experimental identification of the negative polaron localized on the C{sub 70}-cage in polymer?fullerene bulk heterojunctions has been obtained. When recorded at conventional X-band EPR, this signal is overlapping with the signal of the positive polaron, which does not allow for its direct experimental identification. Owing to the superior spectral resolution of the high frequency D-band EPR, we were able to separate light-induced signals from P{sup +} and P{sup ?} in PHT?C{sub 70} bulk heterojunctions. Comparing signals from C{sub 70}-derivatives with different side-chains, we have obtained experimental proof that the polaron is localized on the cage of the C{sub 70} molecule.

Poluektov, Oleg G.; Pilippone, Salvatore; Martin, C. R.; Sperlich, Andreas; Deibel, Carsten; Dyakonov, Vladimir

2010-01-01T23:59:59.000Z

36

Spin signatures of photogenerated radical anions in polymer-[70]fullerene bulk-heterojunctions : high-frequency pulsed EPR spectroscopy.  

SciTech Connect

Charged polarons in thin films of polymer-fullerene composites are investigated by light-induced electron paramagnetic resonance (EPR) at 9.5 GHz (X-band) and 130 GHz (D-band). The materials studied were poly(3-hexylthiophene) (PHT), [6,6]-phenyl-C61-butyric acid methyl ester (C{sub 60}-PCBM), and two different soluble C{sub 70}-derivates: C{sub 70}-PCBM and diphenylmethano[70]fullerene oligoether (C{sub 70}-DPM-OE). The first experimental identification of the negative polaron localized on the C{sub 70}-cage in polymer-fullerene bulk heterojunctions has been obtained. When recorded at conventional X-band EPR, this signal is overlapping with the signal of the positive polaron, which does not allow for its direct experimental identification. Owing to the superior spectral resolution of the high frequency D-band EPR, we were able to separate light-induced signals from P{sup +} and P{sup -} in PHT-C{sub 70} bulk heterojunctions. Comparing signals from C{sub 70}-derivatives with different side-chains, we have obtained experimental proof that the polaron is localized on the cage of the C{sub 70} molecule.

Poluektov, O. G.; Filippone, S.; Martin, N.; Sperlich, A.; Deibel, C.; Dyakonov, V. (Chemical Sciences and Engineering Division); (Univ. Complutense de Madrid); (Univ. of Wurzburg)

2010-04-14T23:59:59.000Z

37

A compact physical model for morphology induced intrinsic degradation of organic bulk heterojunction solar cell  

E-Print Network (OSTI)

challenge for economic viability of any solar cell technology. Well known examples include light heterojunction solar cell Biswajit Raya) and Muhammad A. Alamb) School of Electrical and Computer Engineering-OPV literature shows that the degradation mechanisms of BH solar cell are complex, diverse, and poorly understood

Alam, Muhammad A.

38

Organic bulk heterojunction solar cells using poly,,2,5-bis,,3-tetradecyllthiophen-2-yl...thieno3,2,-bthiophene...  

E-Print Network (OSTI)

. While the cost per watt of solar cell technology has steadily decreased in the past decade, an estimatedOrganic bulk heterojunction solar cells using poly,,2,5-bis,,3-tetradecyllthiophen-2-yl...thieno3 By transitioning to semicrystalline polymers, the performance of polymer-based solar cells has recently increased

McGehee, Michael

39

Effects of cathode modification using spin-coated lithium acetate on the performances of polymer bulk-heterojunction solar cells  

Science Journals Connector (OSTI)

In this report we show that the performances of polymer bulk-heterojunction solar cells were improved by inserting thin films of lithium acetate layers between the active layer and the cathode using a spin-coating process. Comparing with the device without the cathode modification significant enhancements of Voc (open circuit voltage) from 0.42?V to 0.55?V and device efficiency from 1.4% to 4.1% were achieved. X-ray and ultraviolet photoelectron spectroscopic studies indicate that both the improved damage tolerance of the active layer under the thermally evaporated metal and an n-type doping at the metal/organic interface play the crucial roles in the enhanced performances.

Liang Jiang; Aiyuan Li; Shizhao Zheng; King-Young Wong

2013-01-01T23:59:59.000Z

40

Efficient Organic Solar Cells Based on a Stacked Bulk Heterojunction Structure  

Science Journals Connector (OSTI)

Bulk generated charge carriers need to percolate within the bulk blend toward their specific electrodes. That may lead to reduced charge carrier mobility by the intermixing of two compounds which again limits the...

Zhang Xinfang; Xu Zheng; Chen Yuening…

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

A Bifunctional Copolymer Additive to Utilize Photoenergy Transfer and To Improve Hole Mobility for Organic Ternary Bulk-Heterojunction Solar Cell  

Science Journals Connector (OSTI)

A Bifunctional Copolymer Additive to Utilize Photoenergy Transfer and To Improve Hole Mobility for Organic Ternary Bulk-Heterojunction Solar Cell ... Over the past decade, organic photovoltaics (OPVs) have attracted significant attention for the production of solar energy owing to their potential advantages, such as low cost, flexibility, lightweight, large area, and simple processability. ... within the active layer blend and produce solar cells with high series resistances and low overall PCEs. ...

Cheng-Yu Chi; Ming-Chung Chen; Der-Jang Liaw; Han-Yu Wu; Ying-Chi Huang; Yian Tai

2014-07-17T23:59:59.000Z

42

Method to analyze the ability of bulk heterojunctions of organic and hybrid solar cells to dissociate photogenerated excitons and collect free carriers  

SciTech Connect

We have developed a model to predict and analyze the photocurrent generation and resulting charge carrier Dissociation and Collection Efficiency (DCE) through reflectivity and quantum efficiency spectra. The DCE is regarded as a function of the morphology and exciton transport properties of the bulk heterojunction and is therefore a way to investigate the final properties of photoactive layer in a solar cell. Method proposed allows determination of the efficiency at which photogenerated excitons are dissociated in a working device with respect to the position in the cell at which the generation occurs. The method is tested on our results as well as on a number of results already present in the literature.

Basta, M.; Dusza, M.; Palewicz, M.; Nawrot, U.; Granek, F., E-mail: filip.granek@eitplus.pl [Wroclaw Research Centre EIT, Stablowicka 147, 54-066 Wroclaw (Poland)

2014-05-07T23:59:59.000Z

43

The impact of thermal annealing temperature on the low-frequency noise characteristics of P3HT:PCBM bulk heterojunction organic solar cells  

Science Journals Connector (OSTI)

Abstract We investigate the dark low-frequency noise characteristics of P3HT:PCBM bulk heterojunction organic solar cells in both forward and reverse bias conditions. The current noise power spectral density (SI) is “1/f”-like and is compared among cells annealed at different temperatures (60 °C to 140 °C). The asymmetric relationship of SI versus DC dark current (IDC) can be explained by the competition between the recombination current noise and tunneling current noise. Among the different annealing temperatures, we find that higher annealing temperature yields smaller ratio of the Hooge parameter to the carrier recombination lifetime, which is reflected in the forward bias SI versus IDC relationship. We demonstrate that the low-frequency noise can serve as a non-destructive diagnostic indicator of the performance of organic solar cells.

Lijun Li; Yang Shen; Joe C. Campbell

2014-01-01T23:59:59.000Z

44

Effect of Metal Nanoparticles on Absorption Enhancement in Organic Solar Cells  

Science Journals Connector (OSTI)

In this study, for increasing absorption of the active layer in bulk heterojunction (BHJ) organic solar cells (OSCs), we used surface Plasmon effect. For showing the results, we...

Rostami, A; Andalibi, Sh

45

Absence of Structural Impact of Noble Nanoparticles on P3HT: PCBM Blends for Plasmon Enhanced Bulk-Heterojunction Organic Solar Cells Probed by Synchrotron Grazing Incidence X-Ray Diffraction  

E-Print Network (OSTI)

The incorporation of noble metal nanoparticles, displaying localized surface plasmon resonance, in the active area of donor-acceptor bulk-heterojunction organic photovoltaic devices is an industrially compatible light trapping strategy, able to guarantee better absorption of the incident photons and give an efficiency improvement between 12% and 38%. In the present work, we investigate the effect of Au and Ag nanoparticles blended with P3HT: PCBM on the P3HT crystallization dynamics by synchrotron grazing incidence X-ray diffraction. We conclude that the presence of (1) 80nm Au, (2) mix of 5nm, 50nm, 80nm Au, (3) 40nm Ag, and (4) 10nm, 40nm, 60nm Ag colloidal nanoparticles, at different concentrations below 0.3 wt% in P3HT: PCBM blends, does not affect the behaviour of the blends themselves.

Samuele Lilliu; Mejd Alsari; Oier Bikondoa; J. Emyr Macdonald; Marcus S. Dahlem

2014-10-18T23:59:59.000Z

46

Innovative approaches to improve bulk heterojuction organic photovoltaic device performance.  

E-Print Network (OSTI)

??In this thesis we studied the electrical properties of bulk heterojunction organic photovoltaic (OPV) devices fabricated using a variety of conjugated polymers, including regioregular P3HT,… (more)

Zhang, Ye

2010-01-01T23:59:59.000Z

47

Heterojunction solar cell  

DOE Patents (OSTI)

A high-efficiency single heterojunction solar cell is described wherein a thin emitter layer (preferably Ga[sub 0.52]In[sub 0.48]P) forms a heterojunction with a GaAs absorber layer. The conversion efficiency of the solar cell is at least 25.7%. The solar cell preferably includes a passivating layer between the substrate and the absorber layer. An anti-reflection coating is preferably disposed over the emitter layer. 1 fig.

Olson, J.M.

1994-08-30T23:59:59.000Z

48

Nanocrystalline Heterojunction Materials  

DOE Patents (OSTI)

Mesoporous nanocrystalline titanium dioxide heterojunction materials and methods of making the same are disclosed. In one disclosed embodiment, materials comprising a core of titanium dioxide and a shell of a molybdenum oxide exhibit a decrease in their photoadsorption energy as the size of the titanium dioxide core decreases.

Elder, Scott H. (Portland, OR); Su, Yali (Richland, WA); Gao, Yufei (Blue Bell, PA); Heald, Steve M. (Downers Grove, IL)

2004-02-03T23:59:59.000Z

49

Heterojunction Silicon Microwire Solar Cells  

Science Journals Connector (OSTI)

Heterojunction Silicon Microwire Solar Cells ... § Center for Advanced Photovoltaic Devices and Systems, University of Waterloo, 200 University Ave W, Waterloo, Ontario N2L 3G1, Canada ...

Majid Gharghi; Ehsanollah Fathi; Boubacar Kante; Siva Sivoththaman; Xiang Zhang

2012-11-21T23:59:59.000Z

50

Monolayer MoS2 Heterojunction Solar Cells  

Science Journals Connector (OSTI)

Monolayer MoS2 Heterojunction Solar Cells ... molybdenum disulfide; heterojunction solar cell; 2D material; monolayer; chemical vapor deposition ...

Meng-Lin Tsai; Sheng-Han Su; Jan-Kai Chang; Dung-Sheng Tsai; Chang-Hsiao Chen; Chih-I Wu; Lain-Jong Li; Lih-Juann Chen; Jr-Hau He

2014-07-21T23:59:59.000Z

51

Controlling Axial p-n Heterojunction Abruptness Through Catalyst...  

NLE Websites -- All DOE Office Websites (Extended Search)

Axial p-n Heterojunction Abruptness Through Catalyst Alloying in Vapor-Liquid-Solid Grown Semiconductor Nanowires. Controlling Axial p-n Heterojunction Abruptness Through Catalyst...

52

Semiconductor Aspects of Organic Bulk Heterojunction Solar Cells  

Science Journals Connector (OSTI)

During the last few years organic solar cells have been discussed as a promising alternative to inorganic semiconductors for renewable energy production. These organic photovoltaic devices offer the possibility o...

Christoph J. Brabec

2003-01-01T23:59:59.000Z

53

Decohesion Kinetics in Polymer Organic Solar Cells  

Science Journals Connector (OSTI)

Decohesion Kinetics in Polymer Organic Solar Cells ... We investigate the role of molecular weight (MW) of the photoactive polymer poly(3-hexylthiophene) (P3HT) on the temperature-dependent decohesion kinetics of bulk heterojunction (BHJ) organic solar cells (OSCs). ... fullerenes; solar cells; thin films; fracture; polymer ...

Christopher Bruner; Fernando Novoa; Stephanie Dupont; Reinhold Dauskardt

2014-11-04T23:59:59.000Z

54

Enhanced Performance of Polymer Solar Cells using PEDOT:PSS Doped with Fe3O4 Magnetic Nanoparticles Aligned by an External Magnetostatic Field as an Anode Buffer Layer  

Science Journals Connector (OSTI)

Bulk heterojunction (BHJ) polymer solar cells (PSCs) have shown great potential as one of the renewable and cost-effective energy sources. ... (14) Compared with p-type metal oxides, PEDOT:PSS shows advantages in fabrication simplicity and device efficiency but disadvantages on stability due to its acidic nature. ...

Kai Wang; Chao Yi; Xiaowen Hu; Chang Liu; Yan Sun; Jianhui Hou; Yongfang Li; Jie Zheng; Steven Chuang; Alamgir Karim; Xiong Gong

2014-07-01T23:59:59.000Z

55

Solution-Processed Organic Solar Cells with Power Conversion Efficiencies of 2.5% using Benzothiadiazole/Imide-Based Acceptors  

E-Print Network (OSTI)

Solution-Processed Organic Solar Cells with Power Conversion Efficiencies of 2.5% using achieved 0.1% power-conversion efficiency. KEYWORDS: organic electronics, solar cells, photovoltaic devices significantly different behav- iors in bulk heterojunction (BHJ) solar cells using poly(3-hexylthiophene) (P3HT

McGehee, Michael

56

Polyaniline on crystalline silicon heterojunction solar cells Weining Wanga  

E-Print Network (OSTI)

-Si have long been of fundamental interest, and amorphous silicon a-Si:H /c-Si heterojunctions are now is about the current limit achieved with a-Si:H/c-Si heterojunctions. The largest VOC we ob- tained was 0Polyaniline on crystalline silicon heterojunction solar cells Weining Wanga and E. A. Schiff

Schiff, Eric A.

57

Exclusively Thermal Donor-doped Cz Wafers for Silicon Heterojunction Solar Cell Technology  

Science Journals Connector (OSTI)

Abstract In this paper, a first evaluation of the compatibility between thermal donor-doped Czochralski silicon and the hydrogenated amorphous Silicon/crystalline Silicon heterojunction technology, is presented. The wafers resistivity was adjusted thanks to the controlled thermal donors generation through 450 °C anneals of calculated durations, following a model detailed in this paper. Minority carrier lifetimes higher than 2 milliseconds, matching the requirements of the heterojunction technology used, were demonstrated. The solar cells were manufactured and efficiencies comparable to cells based on “high quality” Float-Zone substrates were obtained. The stability of the solar cells performances under illumination and temperature was also assessed, and revealed no degradation of the bulk quality even after prolonged illumination.

Frédéric Jay; Jordi Veirman; Nora Najid; Delfina Muñoz; Sébastien Dubois; Anis Jouini

2014-01-01T23:59:59.000Z

58

Heterojunction solar cell with passivated emitter surface  

DOE Patents (OSTI)

A high-efficiency heterojunction solar cell is described wherein a thin emitter layer (preferably Ga[sub 0.52]In[sub 0.48]P) forms a heterojunction with a GaAs absorber layer. A passivating window layer of defined composition is disposed over the emitter layer. The conversion efficiency of the solar cell is at least 25.7%. The solar cell preferably includes a passivating layer between the substrate and the absorber layer. An anti-reflection coating is preferably disposed over the window layer. 1 fig.

Olson, J.M.; Kurtz, S.R.

1994-05-31T23:59:59.000Z

59

Crystalline-Silicon/Organic Heterojunctions for Solar  

E-Print Network (OSTI)

-semiconductors is potentially cheaper, but the organic solar cells are not very efficient. In this thesis we explore if organic semiconductors can be integrated with silicon to form hybrid organic/silicon solar cells that are both efficient, a silicon/organic heterojunction solar cell with an open-circuit voltage of 0.59 V and power conversion

60

Rational Design of Zinc Phosphide Heterojunction Photovoltaics  

E-Print Network (OSTI)

Rational Design of Zinc Phosphide Heterojunction Photovoltaics Thesis by Jeffrey Paul Bosco would meet me with the same energy and enthusiasm regarding the topic of zinc phosphide photovoltaics to the field of earth-abundant photovoltaics has been indispensable to my work. Greg also made a great mentor

Winfree, Erik

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Vacuum-Deposited Planar Heterojunction Polymer Solar Cells  

Science Journals Connector (OSTI)

Vacuum-Deposited Planar Heterojunction Polymer Solar Cells ... Bilayer heterojunction solar cells were fabricated by sequential deposition of P3HT and C60 and the photovoltaic response measured. ... organic solar cells; conjugated polymers; poly(3-hexylthiophene); vacuum thermal deposition; thin films ...

Peter Kovacik; Giuseppe Sforazzini; Andrew G. Cook; Shawn M. Willis; Patrick S. Grant; Hazel E. Assender; Andrew A. R. Watt

2010-12-14T23:59:59.000Z

62

Structure, Dynamics, and Power Conversion Efficiency Correlations in a New Low Bandgap Polymer: PCBM Solar Cell  

Science Journals Connector (OSTI)

Since their discovery about 15 years ago, bulk heterojunction (BHJ) organic photovoltaic (OPV) devices made from semiconducting polymers have shown promise for future commercialization due to their low cost, ease of fabrication, and small environmental impact relative to silicon and heavy metal based semiconductor solar cells. ... (1-3) To achieve a high power conversion efficiency (PCE) in solar cells based on BHJ OPV materials, the semiconducting polymer composites must be efficient in light harvesting, exciton splitting, charge carrier generation, and transport. ... The white light continuum probe pulses were generated by focusing a few microjoules of the Ti:sapphire amplifier output onto a sapphire disk. ...

Jianchang Guo; Yongye Liang; Jodi Szarko; Byeongdu Lee; Hae Jung Son; Brian S. Rolczynski; Luping Yu; Lin X. Chen

2009-12-28T23:59:59.000Z

63

Heterojunction solar cells produced by porous silicon layer transfer technology  

Science Journals Connector (OSTI)

In this paper, we present the result of heterojunction solar cells based on porous silicon layer transfer technology. a-Si/c-Si structured solar cells were prepared in which the c-Si ... was investigated. The spe...

Zhihao Yue; Honglie Shen; Lei Zhang; Bin Liu; Chao Gao; Hongjie Lv

2012-09-01T23:59:59.000Z

64

Indium oxide/n-silicon heterojunction solar cells  

DOE Patents (OSTI)

A high photo-conversion efficiency indium oxide/n-silicon heterojunction solar cell is spray deposited from a solution containing indium trichloride. The solar cell exhibits an Air Mass One solar conversion efficiency in excess of about 10%.

Feng, Tom (Morris Plains, NJ); Ghosh, Amal K. (New Providence, NJ)

1982-12-28T23:59:59.000Z

65

SYNTHESIS AND CHARACTERIZATION OF PYRIDINE END-FUNCTIONALIZED POLY (3-HEXYLTHIOPHENE)s: POTENTIAL LIGANDS FOR SQD/P3HT BHJs  

SciTech Connect

Extensive research has been done to optimize donor-acceptor properties of bulk heterojunction organic photovoltaics (BHJ OPVs) leading to devices with relatively high power conversion efficiencies (>5%). Polymer-nanoparticle hybrid solar cells are one class of BHJ OPVs that incorporate nanoparticles (electron carrier) in a polymer matrix (hole carrier). Blending inorganic nanoparticles with an organic polymer matrix is challenging due to unfavorable interactions between the nanoparticle and polymer leading to aggregation and poor charge separation. One method to improve ordering of the BHJ is by use of ligands on the inorganic nanoparticles that facilitate homogenous dispersion within the polymer matrix. This paper will discuss the preparation of pyridine end-functionalized P3HTs by in situ quenching of the Grignard Metathesis Polymerization with functional Grignard reagents. The degree of functionality of the polymers is determined by MALDI-TOF MS. In addition, methods to optimize the functionality of the resulting polymer will also be discussed.

Pickel, Deanna L [ORNL] [ORNL; Kochemba, William Michael [ORNL] [ORNL; Kilbey, II, S Michael [ORNL

2011-01-01T23:59:59.000Z

66

Interfacial Engineering for Highly Efficient-Conjugated Polymer-Based Bulk Heterojunction Photovoltaic Devices  

SciTech Connect

The aim of our proposal is to apply interface engineering approach to improve charge extraction, guide active layer morphology, improve materials compatibility, and ultimately allow the fabrication of high efficiency tandem cells. Specifically, we aim at developing: i. Interfacial engineering using small molecule self-assembled monolayers ii. Nanostructure engineering in OPVs using polymer brushes iii. Development of efficient light harvesting and high mobility materials for OPVs iv. Physical characterization of the nanostructured systems using electrostatic force microscopy, and conducting atomic force microscopy v. All-solution processed organic-based tandem cells using interfacial engineering to optimize the recombination layer currents vi. Theoretical modeling of charge transport in the active semiconducting layer The material development effort is guided by advanced computer modeling and surface/ interface engineering tools to allow us to obtain better understanding of the effect of electrode modifications on OPV performance for the investigation of more elaborate device structures. The materials and devices developed within this program represent a major conceptual advancement using an integrated approach combining rational molecular design, material, interface, process, and device engineering to achieve solar cells with high efficiency, stability, and the potential to be used for large-area roll-to-roll printing. This may create significant impact in lowering manufacturing cost of polymer solar cells for promoting clean renewable energy use and preventing the side effects from using fossil fuels to impact environment.

Alex Jen; David Ginger; Christine Luscombe; Hong Ma

2012-04-02T23:59:59.000Z

67

Sodium bromide electron-extraction layers for polymer bulk-heterojunction solar cells  

SciTech Connect

Inexpensive and non-toxic sodium bromide (NaBr) was introduced into polymer solar cells (PSCs) as the cathode buffer layer (CBL) and the electron extraction characteristics of the NaBr CBL were investigated in detail. The PSCs based on NaBr CBL with different thicknesses (i.e., 0?nm, 0.5?nm, 1?nm, and 1.5?nm) were prepared and studied. The optimal thickness of NaBr was 1?nm according to the photovoltaic data of PSCs. The open-circuit voltage (V{sub oc}), short-circuit current density (J{sub sc}), fill factor (FF), and power conversion efficiency (PCE) of the PSC with 1?nm NaBr were evaluated to be 0.58?V, 7.36?mA/cm{sup 2}, 0.63, and 2.70%, respectively, which were comparable to those of the reference device with the commonly used LiF. The optimized photovoltaic performance of PSC with 1?nm NaBr was ascribed to the improved electron transport and extraction capability of 1?nm NaBr in PSCs. In addition, the NaBr CBL could prevent the diffusion of oxygen and water vapor into the active layer and prolong the lifetime of the devices to some extent. Therefore, NaBr layer could be considered as a promising non-toxic CBL for PSCs in future.

Gao, Zhi; Qu, Bo, E-mail: bqu@pku.edu.cn; Xiao, Lixin; Chen, Zhijian [State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 (China) [State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 (China); New Display Device and System Integration Collaborative Innovation Center of the West Coast of the Taiwan Strait, Fuzhou 350002 (China); Zhang, Lipei [State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 (China)] [State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 (China); Gong, Qihuang [State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 (China) [State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 (China); Collaborative Innovation Center of Quantum Matter, Beijing 100871 (China)

2014-03-10T23:59:59.000Z

68

Low Band Gap Poly(thienylene vinylene)/Fullerene Bulk Heterojunction Photovoltaic Cells  

Science Journals Connector (OSTI)

This work was funded by the Initiative for Renewable Energy and the Environment (IREE) at the University of Minnesota (UMN) and the Xcel Energy Renewable Development Fund. ...

Jung Yong Kim; Yang Qin; Derek M. Stevens; Ozan Ugurlu; Vivek Kalihari; Marc A. Hillmyer; C. Daniel Frisbie

2009-05-21T23:59:59.000Z

69

Bulk heterojunction organic solar cell based on a novel fluorescent fluorine–boron complex  

Science Journals Connector (OSTI)

Organic materials in solar cells are a promising alternative to inorganic ones...1–4...]. Moreover, the chemical flexibility for modifications on organic materials via chemical synthesis methods drives the...5–7....

Fen Qiao; Aimin Liu; Ying Zhou; Yi Xiao; Ping Ou Yang

2009-03-01T23:59:59.000Z

70

Investigation of pentaarylazafullerenes as acceptor systems for bulk-heterojunction organic solar cells  

Science Journals Connector (OSTI)

Abstract In a comparative study a novel class of pentaarylazafullerene derivatives is investigated as acceptor material in solution-processed organic solar cells. Due to their raised lowest unoccupied molecular orbital (LUMO) compared to phenyl-C61-butyric acid methyl ester (PC61BM) the orbital matching to P3HT is optimized so that an increased open-circuit voltage (VOC) compared to the standard PC61BM acceptor is gained. However, the performance of pentaarylazafullerene solar cells is limited by rather low short circuit currents (JSC) and fill factors (FF) which can be partially improved by using 1-methylnaphtalene as additive. Within this series the azafullerenes with phenoxyphenyl and phenoxymethyl addends 1 and 3 show the best results with encouraging \\{VOCs\\} of >800 mV and power conversion efficiencies (PCEs) of 0.9%.

Cordula D. Wessendorf; Regina Eigler; Siegfried Eigler; Jonas Hanisch; Andreas Hirsch; Erik Ahlswede

2015-01-01T23:59:59.000Z

71

Bulk Heterojunction Organic Solar Cells utilizing a Benzothiadiazole-based Oligomer  

E-Print Network (OSTI)

Advantages over silicon solar cells · Roll-to-roll manufacturing lowers costs through a faster rate cells, which have issues of their own, will remain the dominant solar energy provider and the world to find a viable option to alleviate global energy concerns. One proposed solution, the organic solar cell

Collins, Gary S.

72

Tuning of defects in ZnO nanorod arrays used in bulk heterojunction solar cells  

E-Print Network (OSTI)

in nanostructured form [9-13]. Low-cost manufacturing routes for metal oxides, such as electrochemical deposition and hydrothermal pro- treatments are necessary to reduce defect concentrations and to prevent high series resistance in the final photo- voltaic device... being around 5%). Scanning electron microscopy images were taken using a LEO VP-1530 field emission scanning electron micro- scope (Peabody, MA, USA). Photovoltaic cell processing ZnO nanorod arrays were incorporated in inverted poly (3-hexylthiophene...

Iza, Diana C; Muñoz-Rojas, David; Jia, Quanxi; Swartzentruber, Brian; MacManus-Driscoll, Judith L

2012-11-27T23:59:59.000Z

73

Predicting Vertical Phase Segregation in Polymer-Fullerene Bulk Heterojunction Solar Cells by Free Energy Analysis  

Science Journals Connector (OSTI)

In this work, for the first time, interaction free energies of the device constituents are determined using surface energy analysis as extrapolated from contact angle measurements. ... Angle resolved survey spectra were collected in hybrid lens mode using 160 eV pass energy in the 0–1200 eV range with a 1 eV step size and dwell time of 1 s. ... Sporadic dark spots are also featured in the blend films (red circles), which are attributed to sparse PCBM clusters at the exposed surface. ...

Michael D. Clark; Michael L. Jespersen; Romesh J. Patel; Benjamin J. Leever

2013-05-20T23:59:59.000Z

74

Copper oxide/N-silicon heterojunction photovoltaic device  

DOE Patents (OSTI)

A photovoltaic device having characteristics of a high efficiency solar cell comprising a Cu.sub.x O/n-Si heterojunction. The Cu.sub.x O layer is formed by heating a deposited copper layer in an oxygen containing ambient.

Feng, Tom (Morris Plains, NJ); Ghosh, Amal K. (New Providence, NJ)

1982-01-01T23:59:59.000Z

75

Depleted-Heterojunction Colloidal Quantum Dot Solar Cells  

E-Print Network (OSTI)

Depleted-Heterojunction Colloidal Quantum Dot Solar Cells Andras G. Pattantyus-Abraham,, Illan J and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada-circuit voltage (Voc) and fill factor (FF). The power conversion efficiency ( ) for an in- put solar intensity

76

Hanford ETR Bulk Vitrification System - Demonstration Bulk Vitrification  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Bulk Vitrification System - Demonstration Bulk Bulk Vitrification System - Demonstration Bulk Vitrification System (DBVS) Review Report Hanford ETR Bulk Vitrification System - Demonstration Bulk Vitrification System (DBVS) Review Report Full Document and Summary Versions are available for download Hanford ETR Bulk Vitrification System - Demonstration Bulk Vitrification System (DBVS) Review Report Summary - Demonstration Bulk Vitrification System (DBVS) for Low-Actvity Waste at Hanford More Documents & Publications Independent Oversight Activity Report, Hanford Waste Treatment and Immobilization Plant - November 2013 SRS Tank 48H Waste Treatment Project Technology Readiness Assessment External Technical Review for Evaluation of System Level Modeling and Simulation Tools in Support of Hanford Site Liquid Waste Process

77

Effect of an in-plane magnetic field on the photoluminescence spectrum of modulation-doped quantum wells and heterojunctions  

Science Journals Connector (OSTI)

The photoluminescence (PL) spectrum of modulation-doped GaAs?AlGaAs quantum wells and heterojunctions (HJ) is studied under a magnetic field (B?) applied parallel to the two-dimensional electron gas (2DEG) layer. The effect of B? strongly depends on the electron-hole separation, and we revealed remarkable B?-induced modifications of the PL spectra in both types of heterostructures. A model considering the direct optical transitions between the conduction and valence subbands that are shifted in k-space under B?, accounts qualitatively for the observed spectral modifications. In the HJs, the 2DEG-hole PL intensity is strongly enhanced relatively to the bulk exciton PL with increasing B?. This means that the distance between the photoholes and the 2DEG decreases with increasing B?, and thus free holes are responsible for the 2DEG-hole PL.

B. M. Ashkinadze, E. Linder, E. Cohen, and L. N. Pfeiffer

2005-01-06T23:59:59.000Z

78

Junction Transport in Epitaxial Film Silicon Heterojunction Solar Cells: Preprint  

SciTech Connect

We report our progress toward low-temperature HWCVD epitaxial film silicon solar cells on inexpensive seed layers, with a focus on the junction transport physics exhibited by our devices. Heterojunctions of i/p hydrogenated amorphous Si (a-Si) on our n-type epitaxial crystal Si on n++ Si wafers show space-charge-region recombination, tunneling or diffusive transport depending on both epitaxial Si quality and the applied forward voltage.

Young, D. L.; Li, J. V.; Teplin, C. W.; Stradins, P.; Branz, H. M.

2011-07-01T23:59:59.000Z

79

Highmobility inverted selectively doped heterojunctions Hadas Shtrikman, M. Heiblum, K. Seo, D. E. Galbi, and L. Osterling  

E-Print Network (OSTI)

Highmobility inverted selectively doped heterojunctions Hadas Shtrikman, M. Heiblum, K. Seo, D. E in inverted GaAsAlGaAs heterojunctions Appl. Phys. Lett. 52, 1268 (1988); 10.1063/1.99176 High mobility: 132.76.50.6 On: Thu, 10 Apr 2014 16:05:40 #12;High-mobility inverted selectively doped heterojunctions

Heiblum, Mordehai "Moty"

80

Analysis of a-Si:H/TCO contact resistance for the Si heterojunction back-contact solar cell  

E-Print Network (OSTI)

Analysis of a-Si:H/TCO contact resistance for the Si heterojunction back-contact solar cell Seung- circuit voltage (Voc) and the conversion efficiency of the Si solar cell. Recently, a-Si:H heterojunction (heterojunction with intrinsic thin layer) cell [1] even with practical-sized Czochralski-grown (CZ) wafer. The a-Si:H

Park, Byungwoo

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

COMMUNICATIONS Cd doping at the CuInSe2 CdS heterojunction  

E-Print Network (OSTI)

COMMUNICATIONS Cd doping at the CuInSe2 �CdS heterojunction Dongxiang Liaoa) and Angus Rockett that CIGS could be doped with Cd during chemical bath deposition CBD of CdS.6 However, Cd doping of CIGS October 2002; accepted 7 March 2003 The chemical composition of the CuInSe2 /CdS heterojunction interface

Rockett, Angus

82

CNT-SI HETEROJUNCTION SOLAR CELLS WITH STRUCTURE-CONTROLLED SINGLE-WALL CARBON NANOTUBE FILMS  

E-Print Network (OSTI)

CNT-SI HETEROJUNCTION SOLAR CELLS WITH STRUCTURE- CONTROLLED SINGLE-WALL CARBON NANOTUBE FILMS. The heterojunction solar cell was fabricated by dry depositing the SWNT film to the 3 mm by 3 mm n-type silicon solar cells. We proposed a water-vapor treatment to build up SWNTs to a self-assembled micro- honeycomb

Maruyama, Shigeo

83

Bulk Hydrogen Strategic Directions for  

E-Print Network (OSTI)

Bulk Hydrogen Storage Strategic Directions for Hydrogen Delivery Workshop May 7-8, 2003 Crystal City, Virginia #12;Breakout Session - Bulk Hydrogen Storage Main Themes/Caveats Bulk Storage = Anything storage is an economic solution to address supply/demand imbalance #12;Breakout Session - Bulk Hydrogen

84

Auctioning Bulk Mobile Messages  

Science Journals Connector (OSTI)

The search for enablers of continued growth of SMS traffic, as well as the take-off of the more diversified MMS message contents, open up for enterprises the potential of bulk use of mobile messaging, instead of essentially one-by-one use. In parallel, ... Keywords: EMS, MMS, SMS, auctions, mobile commerce, mobile operators, multi-attribute auctions

S. Meij; L. -F. Pau

2006-05-01T23:59:59.000Z

85

High-Performance Nanostructured Inorganic?Organic Heterojunction Solar Cells  

Science Journals Connector (OSTI)

High-Performance Nanostructured Inorganic?Organic Heterojunction Solar Cells ... Although single-crystalline Si-based solar cells are successfully used to harvest solar energy, inexpensive production of photovoltaic (PV) devices at a cost comparable to the energy production cost of fossil fuels has become a critical issue to meet the global energy crisis. ... The photocurrent output of a solar cell based on exciton dissociation from sensitized solar cells depends on the quantum efficiencies of light harvesting (?lh), electron injection (?inj), and electron collection (?cc), which is determined by the competition between recombination and charge collection. ...

Jeong Ah Chang; Jae Hui Rhee; Sang Hyuk Im; Yong Hui Lee; Hi-jung Kim; Sang Il Seok; Md. K. Nazeeruddin; Michael Gratzel

2010-05-28T23:59:59.000Z

86

Band offsets at heterojunctions and the charge neutrality condition  

E-Print Network (OSTI)

. Transitivity test for several (110) heterojunctions assuming that Ek & EB & E+ g g g Heterojunction Sequence A/C Ge/A1As Ge/A1Sb Ge/Gaks Ge/Gap Ge/InP Ge/Si Si/A1As Si/GaAs Si/GaP Si/InAs Si/InSb Gaks/InAs GaSb/InAs InP/InAs InP /Alks A/8 Ge.../GaAs Ge/InP Ge/Si Ge/Si Ge/InP Ge/Si Ge/GaAs Ge/Si Ge/Si Ge/GaSb Si/Gaks Si/InP Si/InP Si/GaAs Si/Ge Si/GaSb Si/Ge GaAs/InP Gaks/Si Gaks/Ge GaSb/Ge InP/Si InP/Ge InP/GaAs B/C GaAs/A1As InP/A1As Si/A1As Si/klSb InP/GaAs Si...

Taferner, Waltraud Teresa

1990-01-01T23:59:59.000Z

87

Influence of oriented topological defects on the mechanical properties of carbon nanotube heterojunctions  

SciTech Connect

The mechanical properties of finite-length (5,0)/(8,0) single-walled carbon nanotube (SWCNT) heterojunctions with manipulated topological defects are investigated using molecular dynamics simulation calculations. The results show that the mechanical properties and deformation behavior of SWCNT heterojunctions are mainly affected not only by the diameter of the thinner segment of the SWCNT heterojunction but also by the orientation of the heptagon-heptagon (7-7) pair in the junction region. Moreover, the orientation of the 7-7 pair strongly affects those properties in the compression loading than those in tensile loading. Finally, it is found that the location of buckling deformation in the heterojunctions is dependent on the orientation of the 7-7 pair in the compression.

Lee, We-Jay [National Center for High-Performance Computing; Chang, Jee-Gong [National Center for High-Performance Computing; Yang, An-Cheng [National Center for High-Performance Computing; Wang, Yeng-Tseng [National Center for High-Performance Computing; Su, Wan-Sheng [National Center for High-Performance Computing; Wang, Cai-Zhuang [Ames Laboratory; Ho, Kai-Ming [Ames Laboratory

2013-10-10T23:59:59.000Z

88

Method for forming indium oxide/n-silicon heterojunction solar cells  

DOE Patents (OSTI)

A high photo-conversion efficiency indium oxide/n-silicon heterojunction solar cell is spray deposited from a solution containing indium trichloride. The solar cell exhibits an Air Mass One solar conversion efficiency in excess of about 10%.

Feng, Tom (Morris Plains, NJ); Ghosh, Amal K. (New Providence, NJ)

1984-03-13T23:59:59.000Z

89

Creating bulk nanocrystalline metal.  

SciTech Connect

Nanocrystalline and nanostructured materials offer unique microstructure-dependent properties that are superior to coarse-grained materials. These materials have been shown to have very high hardness, strength, and wear resistance. However, most current methods of producing nanostructured materials in weapons-relevant materials create powdered metal that must be consolidated into bulk form to be useful. Conventional consolidation methods are not appropriate due to the need to maintain the nanocrystalline structure. This research investigated new ways of creating nanocrystalline material, new methods of consolidating nanocrystalline material, and an analysis of these different methods of creation and consolidation to evaluate their applicability to mesoscale weapons applications where part features are often under 100 {micro}m wide and the material's microstructure must be very small to give homogeneous properties across the feature.

Fredenburg, D. Anthony (Georgia Institute of Technology, Atlanta, GA); Saldana, Christopher J. (Purdue University, West Lafayette, IN); Gill, David D.; Hall, Aaron Christopher; Roemer, Timothy John (Ktech Corporation, Albuquerque, NM); Vogler, Tracy John; Yang, Pin

2008-10-01T23:59:59.000Z

90

High efficiency silicon nanohole/organic heterojunction hybrid solar cell  

SciTech Connect

High efficiency hybrid solar cells are fabricated based on silicon with a nanohole (SiNH) structure and poly (3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS). The SiNH structure is fabricated using electroless chemical etching with silver catalyst, and the heterojunction is formed by spin coating of PEDOT on the SiNH. The hybrid cells are optimized by varying the hole depth, and a maximum power conversion efficiency of 8.3% is achieved with a hole depth of 1??m. The SiNH hybrid solar cell exhibits a strong antireflection and light trapping property attributed to the sub-wavelength dimension of the SiNH structure.

Hong, Lei [Novitas, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore); Singapore Institute of Manufacturing Technology, A-STAR (Agency for Science, Technology and Research), 71 Nanyang Drive, Singapore 638075 (Singapore); Wang, Xincai; Zheng, Hongyu [Singapore Institute of Manufacturing Technology, A-STAR (Agency for Science, Technology and Research), 71 Nanyang Drive, Singapore 638075 (Singapore); He, Lining; Wang, Hao; Rusli, E-mail: yu.hy@sustc.edu.cn, E-mail: erusli@ntu.edu.sg [Novitas, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore); Yu, Hongyu, E-mail: yu.hy@sustc.edu.cn, E-mail: erusli@ntu.edu.sg [South University of Science and Technology of China, Shenzhen (China)

2014-02-03T23:59:59.000Z

91

Fast photovoltaic effects tuned by vicinal interface microstructure in manganite-based all-perovskite-oxide heterojunctions  

Science Journals Connector (OSTI)

Interfacial microstructure tunable photovoltaic effects have been reported in heterojunctions of La1?xCaxMnO3 thin films and tilted or exact cut...

Lu, Zhi-qing; Ni, Hao; Zhao, Kun; Leng, Wen-xiu; Kong, Yu-Chau; Wong, Hong-Kuen

2011-01-01T23:59:59.000Z

92

Band alignment engineering in organized rrP3HT/C60 bulk heterojunction Arnaud Maillard  

E-Print Network (OSTI)

photovoltaic devices with large-scale and low-cost print- ing techniques associated with the facility to process poly- mer could overcome the cost limitation of traditional inorganic photovoltaic cells [2 multiple technologies, including photovoltaic cells, with the aim of replacing more tradi- tional energy

Rochefort, Alain

93

Enhancement of short-circuit current density in polymer bulk heterojunction solar cells comprising plasmonic silver nanowires  

SciTech Connect

We demonstrate that the influence of plasmonic effects based on silver nanowires (Ag NWs) on the characteristics of polymer solar cells (PSCs). The solution-processed Ag NWs are situated at the interface of anode buffer layer and active layer, which could enhance the performance especially the photocurrent of PSCs by scattering, localized surface plasmon resonance, and surface plasmon polaritons. Plasmonic effects are confirmed by the enhancement of extinction spectra, external quantum efficiency, and steady state photoluminescence. Consequently, the short-circuit current density (J{sub sc}) and power conversion efficiency enhance about 24% and 18%, respectively, under AM1.5 illumination when Ag NWs plasmonic nanostructure incorporated into PSCs.

Yang, Yuzhao; Lin, Xiaofeng; Ou, Jiemei; Chen, Xudong, E-mail: cescxd@mail.sysu.edu.cn, E-mail: stszx@mail.sysu.edu.cn, E-mail: chenyj69@mail.sysu.edu.cn [Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education of China, Sun Yat-sen University, Guangzhou 510275 (China); Qing, Jian; Zhong, Zhenfeng; Zhou, Xiang, E-mail: cescxd@mail.sysu.edu.cn, E-mail: stszx@mail.sysu.edu.cn, E-mail: chenyj69@mail.sysu.edu.cn; Chen, Yujie, E-mail: cescxd@mail.sysu.edu.cn, E-mail: stszx@mail.sysu.edu.cn, E-mail: chenyj69@mail.sysu.edu.cn [State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275 (China); Hu, Chenglong [Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056 (China)

2014-03-24T23:59:59.000Z

94

p-Type semiconducting nickel oxide as an efficiency-enhancing anodal interfacial layer in bulk heterojunction solar cells  

DOE Patents (OSTI)

The present invention, in one aspect, relates to a solar cell. In one embodiment, the solar cell includes an anode, a p-type semiconductor layer formed on the anode, and an active organic layer formed on the p-type semiconductor layer, where the active organic layer has an electron-donating organic material and an electron-accepting organic material.

Irwin, Michael D; Buchholz, Donald B; Marks, Tobin J; Chang, Robert P. H.

2014-11-25T23:59:59.000Z

95

Effect of simultaneous electrical and thermal treatment on the performance of bulk heterojunction organic solar cell blended with organic salt  

SciTech Connect

This work presents the influence of simultaneous electrical and thermal treatment on the performance of organic solar cell blended with organic salt. The organic solar cells were composed of indium tin oxide as anode, poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]: (6,6)-phenyl-C61 butyric acid methyl ester: tetrabutylammonium hexafluorophosphate blend as organic active layer and aluminium as cathode. The devices underwent a simultaneous fixed-voltage electrical and thermal treatment at different temperatures of 25, 50 and 75 °C. It was found that photovoltaic performance improved with the thermal treatment temperature. Accumulation of more organic salt ions in the active layer leads to broadening of p-n doped regions and hence higher built-in electric field across thin intrinsic layer. The simultaneous electrical and thermal treatment has been shown to be able to reduce the electrical treatment voltage.

Sabri, Nasehah Syamin; Yap, Chi Chin; Yahaya, Muhammad [School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor (Malaysia); Salleh, Muhamad Mat [Institute of Microengineering and Nanoelectronics (IMEN), Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor (Malaysia)

2013-11-27T23:59:59.000Z

96

Bulk Heterojunction versus Diffused Bilayer: The Role of Device Geometry in Solution p-Doped Polymer-Based Solar Cells  

Science Journals Connector (OSTI)

KPFM images were acquired with a commercial AFM system (Bruker-AXS) MultiMode AFM with a Nanoscope V controller operating in lift mode (typical lift height 20 nm) by using silicon tips with PtIr coating (SCM-PIT) with k ? 3?N?m–1, tip radius ? 20 nm, and resonant frequency ? 80 Khz. ... Lee, K. H.; Schwenn, P. E.; Smith, A. R. G.; Cavaye, H.; Shaw, P. E.; James, M.; Krueger, K. B.; Gentle, I. R.; Meredith, P.; Burn, P. L.Morphology of All-Solution-Processed “Bilayer” Organic Solar Cells Adv. ...

Anna Loiudice; Aurora Rizzo; Mariano Biasiucci; Giuseppe Gigli

2012-07-09T23:59:59.000Z

97

Tuning the Morphology and Performance of Low Bandgap Polymer: Fullerene Heterojunctions via Solvent Annealing in Selective Solvents  

SciTech Connect

Low bandgap polymer (LBG):fullerene mixtures are some of the most promising organic photovoltaic active layers. Unfortunately, there are no post-deposition treatments available to rationally improve the morphology and performance of as-cast LBG:fullerene OPV active layers, where thermal annealing usually fails. Therefore, there is a glaring need to develop postdeposition methods to guide the morphology of LBG:fullerene bulk heterojunctions towards targeted structures and performance. In this paper, the structural evolution of PCPDTBT:PCBM mixtures with solvent annealing (SA) is examined, focusing on the effect of solvent quality of the fullerene and polymer in the annealing vapor on morphological evolution and device performance. The results indicate that exposure of this active layer to the solvent vapor controls the ordering of PCPDTBT and PCBM phase separation very effectively, presumably by inducing component mobility as the solvent plasticizes the mixture. These results also unexpectedly indicate that solvent annealing in a selective solvent provides a method to invert the morphology of the LBG:fullerene mixture from a polymer aggregate dispersed in a polymer:fullerene matrix to fullerene aggregates dispersed in a polymer:fullerene matrix. The judicious choice of solvent vapor, therefore, provides a unique method to exquisitely control and optimize the morphology of LBG conjugated polymer/fullerene mixtures.

Chen, Huipeng [ORNL; Hsiao, Yu-Che [ORNL; Hu, Bin [ORNL; Dadmun, Mark D [ORNL

2014-01-01T23:59:59.000Z

98

Self-Assembled Micro-Honeycomb Network of Single-Walled Carbon Nanotubes for Heterojunction Solar Cells  

E-Print Network (OSTI)

Self-Assembled Micro-Honeycomb Network of Single-Walled Carbon Nanotubes for Heterojunction Solar@photon.t.u-tokyo.ac.jp Keywords: Self-assembly, micro-honeycomb network, single-walled carbon nanotubes, heterojunction solar cell-assembled micro-honeycomb network (-HN) of SWNTs obtained by water or ethanol vapor treatment of as

Maruyama, Shigeo

99

Controlled Growth of Single-Walled Carbon Nanotubes and Application to CNT-Si Heterojunction Solar Cells  

E-Print Network (OSTI)

assembly of SWNTs for SWNT-Si heterojunction solar cells will be discussed. We found the reversible to a self-assembled micro- honeycomb network for the application of solar cells [4]. The micro is very efficient to collect holes from the interface of Si. The heterojunction solar cell was fabricated

Maruyama, Shigeo

100

Fabrication of ZnO/Cu2O heterojunctions in atmospheric conditions: improved interface quality and solar cell performance  

E-Print Network (OSTI)

Zn_1-xMg_xO/Cu_2O heterojunctions were successfully fabricated in open-air at low temperatures via atmospheric atomic layer deposition of Zn_1-xMg_xO on thermally oxidized cuprous oxide. Solar cells employing these heterojunctions demonstrated a...

Ievskaya, Y.; Hoye, R. L. Z.; Sadhanala, A.; Musselman, K.; MacManus-Driscoll, J. L.

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

A small-signal generator based on a multi-layer graphene/molybdenum disulfide heterojunction  

SciTech Connect

In this work, we fabricate a heterojunction small-signal generator (HSSG) based on a graphene-molybdenum disulfide (MoS{sub 2}) heterojunction. The HSSG is fundamentally different from any analog device developed previously. The HSSG is composed of two quasi-2D heterojunctions and has three terminals named injector (I), recombinator (R), and generator (G). MoS{sub 2} serves as I and G, and graphene works as R in the HSSG. The scale coefficient (??=?I{sub G}/I{sub R}) of the HSSG is 1.14?×?10{sup ?4} (V{sub IG,?IR}?=?0.2?V) to 1.95?×?10{sup ?4} (V{sub IG,?IR}?=?1?V). The current generated from G could be as low as pA scale, which reveals the good performance of the HSSG.

Tan, Zhen; Tian, He; Feng, Tingting; Zhao, Lianfeng; Xie, Dan; Yang, Yi; Xiao, Lei; Wang, Jing; Ren, Tian-Ling, E-mail: RenTL@tsinghua.edu.cn, E-mail: JunXu@tsinghua.edu.cn; Xu, Jun, E-mail: RenTL@tsinghua.edu.cn, E-mail: JunXu@tsinghua.edu.cn [Institute of Microelectronics, Tsinghua University, Beijing 100084, China and Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084 (China)] [Institute of Microelectronics, Tsinghua University, Beijing 100084, China and Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084 (China)

2013-12-23T23:59:59.000Z

102

bulk power | OpenEI  

Open Energy Info (EERE)

bulk power bulk power Dataset Summary Description The Form EIA-411, "Coordinated Bulk Power Supply Program Report," collects information from the Nation's power system planners about the electricity supply, both capacity and energy, that is needed to serve current demand and for future growth. Source Energy Information Administration (EIA) Date Released December 03rd, 2010 (3 years ago) Date Updated December 03rd, 2010 (3 years ago) Keywords bulk power EIA Electricity Generation Data application/vnd.ms-excel icon Net Energy for Load - Historic, Actual and Projected Five-Years (xls, 26.1 KiB) application/vnd.ms-excel icon Noncoincident Peak Load - Historic, Actual and Projected Five-Years (xls, 25.6 KiB) application/vnd.ms-excel icon Noncoincident Peak Load - Historic, Actual and Projected Five-Years (xls, 0 bytes)

103

Bulk Hauling Equipment for CHG  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

load of CHG Semitrailer Mass Trailer or ModuleChassis Module Mass Hydrogen Gas Mass CAPITAL EXPENDITURE FOR BULK HAULING EQUIPMENT For large consumption, total CapEx for...

104

NIR-Absorbing Merocyanine Dyes for BHJ Solar Cells  

Science Journals Connector (OSTI)

This new generation of photovoltaic modules excel with low production costs and the ability to manufacture lighter, highly flexible(4-7) and semitransparent devices,(8, 9) which open avenues for new application areas such as building integrated photovoltaics(10) for sun shading and electricity generating glass facades. ...

André Zitzler-Kunkel; Martin R. Lenze; Nils M. Kronenberg; Ana-Maria Krause; Matthias Stolte; Klaus Meerholz; Frank Würthner

2014-08-12T23:59:59.000Z

105

Micro-Honeycomb Network Structure of Single-Walled Carbon Nanotubes for Heterojunction Solar Cell  

E-Print Network (OSTI)

Micro-Honeycomb Network Structure of Single-Walled Carbon Nanotubes for Heterojunction Solar Cell, The University of Tokyo, Tokyo 113-8656, Japan We propose a self-organized micro-honeycomb network structure in Fig. 2. The micro-honeycomb SWNTs network film was placed on top of the substrate which has a 3 mm Ã? 3

Maruyama, Shigeo

106

Photoconductive Decay Lifetime and Suns-Voc Diagnostics of Efficient Heterojunction Solar Cells: Preprint  

SciTech Connect

We report results of minority carrier lifetime measurements for double-sided p-type Si heterojunction devices and compare Suns-Voc results to Light I-V measurements on 1 cm2 solar cell devices measured on an AM1.5 calibrated XT-10 solar simulator.

Page, M. R.; Iwaniczko, E.; Xu, Y.; Roybal L.; Bauer, R.; Yan, H.-C.; Wang, Q.; Meier, D. L.

2008-05-01T23:59:59.000Z

107

EARTH ABUNDANT MATERIALS FOR HIGH EFFICIENCY HETEROJUNCTION THIN FILM SOLAR CELLS  

E-Print Network (OSTI)

EARTH ABUNDANT MATERIALS FOR HIGH EFFICIENCY HETEROJUNCTION THIN FILM SOLAR CELLS Yun Seog Lee 1; * Corresponding author: buonassisi@mit.edu; ABSTRACT We investigate earth abundant materials for thin- film solar cuprous oxide (Cu2O) as a prototype candidate for investigation as an absorber layer in thin film solar

Ceder, Gerbrand

108

Atomic Structure of Interface States in Silicon Heterojunction Solar Cells B. M. George,1  

E-Print Network (OSTI)

silicon (a-Si:H=c-Si) heterojunction solar cells. We find that (i) the interface exhibits microscopic identify the microscopic origin of the conduction band tail state in the a-Si:H layer, and (iv) present-efficiency solar cells, is formed at the a-Si: H=c-Si interface [8]. Here, similar to other crystalline- amorphous

Schmidt, Wolf Gero

109

Bulk Viscosity of Interacting Hadrons  

E-Print Network (OSTI)

We show that first approximations to the bulk viscosity $\\eta_v$ are expressible in terms of factors that depend on the sound speed $v_s$, the enthalpy, and the interaction (elastic and inelastic) cross section. The explicit dependence of $\\eta_v$ on the factor $(\\frac 13 - v_s^2)$ is demonstrated in the Chapman-Enskog approximation as well as the variational and relaxation time approaches. The interesting feature of bulk viscosity is that the dominant contributions at a given temperature arise from particles which are neither extremely nonrelativistic nor extremely relativistic. Numerical results for a model binary mixture are reported.

A. Wiranata; M. Prakash

2009-06-30T23:59:59.000Z

110

Charm contribution to bulk viscosity  

E-Print Network (OSTI)

In the range of temperatures reached in future heavy ion collision experiments, hadronic pair annihilations and creations of charm quarks may take place within the lifetime of the plasma. As a result, charm quarks may increase the bulk viscosity affecting the early stages of hydrodynamic expansion. Assuming thermalization, we estimate the charm contribution to bulk viscosity within the same effective kinetic theory framework in which the light parton contribution has been computed previously. The time scale at which this physics becomes relevant is related to the width of the transport peak associated with the trace anomaly correlator, and is found to be 600 MeV.

Laine, M

2014-01-01T23:59:59.000Z

111

Charm contribution to bulk viscosity  

E-Print Network (OSTI)

In the range of temperatures reached in future heavy ion collision experiments, hadronic pair annihilations and creations of charm quarks may take place within the lifetime of the plasma. As a result, charm quarks may increase the bulk viscosity affecting the early stages of hydrodynamic expansion. Assuming thermalization, we estimate the charm contribution to bulk viscosity within the same effective kinetic theory framework in which the light parton contribution has been computed previously. The time scale at which this physics becomes relevant is related to the width of the transport peak associated with the trace anomaly correlator, and is found to be 600 MeV.

M. Laine; Kiyoumars A. Sohrabi

2014-10-24T23:59:59.000Z

112

Integrated optical and electrical modeling of plasmon-enhanced thin film photovoltaics: A case-study on organic devices  

SciTech Connect

The nanoscale light control for absorption enhancement of organic photovoltaic (OPV) devices inevitably produces strongly non-uniform optical fields. These non-uniformities due to the localized optical modes are a primary route toward absorption enhancement in OPV devices. Therefore, a rigorous modeling tool taking into account the spatial distribution of optical field and carrier generation is necessary. Presented here is a comprehensive numerical model to describe the coupled optical and electrical behavior of plasmon-enhanced polymer:fullerene bulk heterojunction (BHJ) solar cells. In this model, a position-dependent electron-hole pair generation rate that could become highly non-uniform due to photonic nanostructures is directly calculated from the optical simulations. By considering the absorption and plasmonic properties of nanophotonic gratings included in two different popular device architectures, and applying the Poisson, current continuity, and drift/diffusion equations, the model predicts quantum efficiency, short-circuit current density, and desired carrier mobility ratios for bulk heterojunction devices incorporating nanostructures for light management. In particular, the model predicts a significant degradation of device performance when the carrier species with lower mobility are generated far from the collecting electrode. Consequently, an inverted device architecture is preferred for materials with low hole mobility. This is especially true for devices that include plasmonic nanostructures. Additionally, due to the incorporation of a plasmonic nanostructure, we use simulations to theoretically predict absorption band broadening of a BHJ into energies below the band gap, resulting in a 4.8% increase in generated photocurrent.

Rourke, Devin [Department of Physics, University of Colorado, Boulder, Colorado 80309-0390 (United States); Ahn, Sungmo [Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado 80309-0425 (United States); Nardes, Alexandre M.; Lagemaat, Jao van de; Kopidakis, Nikos [National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401 (United States); Park, Wounjhang, E-mail: won.park@colorado.edu [Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado 80309-0425 (United States); Materials Science and Engineering Program, University of Colorado, Boulder, Colorado 80303 (United States)

2014-09-21T23:59:59.000Z

113

Bulk viscosity and deflationary universes  

E-Print Network (OSTI)

We analyze the conditions that make possible the description of entropy generation in the new inflationary model by means of a nearequilibrium process. We show that there are situations in which the bulk viscosity cannot describe particle production during the coherent field oscillations phase.

J. A. S. Lima; R. Portugal; I. Waga

2007-08-24T23:59:59.000Z

114

Bulk Hauling Equipment for CHG  

NLE Websites -- All DOE Office Websites (Extended Search)

BULK HAULING EQUIPMENT FOR CHG BULK HAULING EQUIPMENT FOR CHG Don Baldwin Director of Product Development - Hexagon Lincoln HEXAGON LINCOLN TITAN(tm) Module System Compressed Hydrogen Gas * Capacity 250 bar - 616 kg 350 bar - 809 kg 540 bar - 1155 kg * Gross Vehicle Weight (with prime mover) 250 bar - 28 450 kg 350 bar - 30 820 kg 540 bar - 39 440 kg * Purchase Cost 250 bar - $510,000 350 bar - $633,750 540 bar - $1,100,000 Compressed Natural Gas * Capacity (250 bar at 15 C) - 7412 kg * GVW (With prime mover) - 35 250 kg * Purchase Cost (+/- 5%) - $510,000 HEXAGON LINCOLN TITAN(tm) V Magnum Trailer System Compressed Hydrogen Gas * Capacity 250 bar - 800 kg 350 bar - 1050 kg 540 bar - 1500 kg * Gross Vehicle Weight (with prime mover) 250 bar - 31 000 kg 350 bar - 34 200 kg 540 bar - 45 700 kg * Purchase Cost (+/-

115

Bulk viscosity in hybrid stars  

Science Journals Connector (OSTI)

We compute the bulk viscosity of a mixed quark-hadron phase. In the first scenario to be discussed, the mixed phase occurs at large densities and we assume that it is composed of a mixing of hyperonic matter and quarks in the Color Flavor Locked phase. In a second scenario, the mixed phase occurs at lower densities and it is composed of a mixing of nucleons and unpaired quark matter. We have also investigated the effect of a nonvanishing surface tension at the interface between hadronic and quark matter. In both scenarios, the bulk viscosity is large when the surface tension is absent, while the value of the viscosity reduces in the second scenario when a finite value for the surface tension is taken into account. In all cases, the r-mode instabilities of the corresponding hybrid star are suppressed.

A. Drago; A. Lavagno; G. Pagliara

2005-05-16T23:59:59.000Z

116

Silicon heterojunction solar cell with passivated hole selective MoO{sub x} contact  

SciTech Connect

We explore substoichiometric molybdenum trioxide (MoO{sub x}, x?heterojunction cell. Our results emphasize the strong potential for oxides as carrier selective heterojunction partners to inorganic semiconductors.

Battaglia, Corsin; Yin, Xingtian; Zheng, Maxwell; Javey, Ali, E-mail: ajavey@eecs.berkeley.edu [Electrical Engineering and Computer Sciences Department, University of California, Berkeley, California 94720 (United States); Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Martín de Nicolás, Silvia; De Wolf, Stefaan; Ballif, Christophe [Photovoltaics and Thin Film Electronics Laboratory, Ecole Polytechnique Fédérale de Lausanne, 2000 Neuchâtel (Switzerland)

2014-03-17T23:59:59.000Z

117

Diffusive shielding stabilizes bulk nanobubble clusters  

E-Print Network (OSTI)

Using molecular dynamics, we study the nucleation and stability of bulk nanobubble clusters. We study the formation, growth, and final size of bulk nanobubbles. We find that, as long as the bubble-bubble interspacing is small enough, bulk nanobubbles are stable against dissolution. Simple diffusion calculations provide an excellent match with the simulation results, giving insight into the reason for the stability: nanobubbles in a cluster of bulk nanobubbles "protect" each other from diffusion by a shielding effect.

Weijs, Joost H; Lohse, D

2011-01-01T23:59:59.000Z

118

Design and realization of a GaAs FET integrated with a heterojunction photodiode  

E-Print Network (OSTI)

1595 Design and realization of a GaAs FET integrated with a heterojunction photodiode F. Therez, M, accepté le 6 juillet 1987) Résumé. 2014 L'association d'une photodiode à hétérojonction et d'un circuit circuits intégrant l'amplificateur et la photodiode. Les divers dispositifs sont caractérisés et analysés

Paris-Sud XI, Université de

119

Fabrication of heterojunction solar cells by improved tin oxide deposition on insulating layer  

DOE Patents (OSTI)

Highly efficient tin oxide-silicon heterojunction solar cells are prepared by heating a silicon substrate, having an insulating layer thereon, to provide a substrate temperature in the range of about 300.degree. C. to about 400.degree. C. and thereafter spraying the so-heated substrate with a solution of tin tetrachloride in a organic ester boiling below about 250.degree. C. Preferably the insulating layer is naturally grown silicon oxide layer.

Feng, Tom (Morris Plains, NJ); Ghosh, Amal K. (New Providence, NJ)

1980-01-01T23:59:59.000Z

120

CVD Graphene as Interfacial Layer to Engineer the Organic Donor–Acceptor Heterojunction Interface Properties  

Science Journals Connector (OSTI)

CVD Graphene as Interfacial Layer to Engineer the Organic Donor–Acceptor Heterojunction Interface Properties ... § Institute of Materials Research & Engineering, 3 Research Link, 117602, Singapore ... Current density–voltage (J–V) measurements were carried out in an inert environment (Braun glovebox, N2 atmosphere) under 1 sun (AM 1.5G) conditions using a solar simulator with a light intensity of 100 mW/cm2. ...

Shu Zhong; Jian Qiang Zhong; Hong Ying Mao; Rui Wang; Yu Wang; Dong Chen Qi; Kian Ping Loh; Andrew Thye Shen Wee; Zhi Kuan Chen; Wei Chen

2012-06-04T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

RAPID/BulkTransmission/Siting/California | Open Energy Information  

Open Energy Info (EERE)

Information Desktop Toolkit BETA RAPID Toolkit About Bulk Transmission Geothermal Solar Resources Contribute Contact Us RAPID Bulk Transmission Siting California Bulk...

122

Bulk Hydrogen Storage - Strategic Directions for Hydrogen Delivery...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Bulk Hydrogen Storage Strategic Directions for Hydrogen Delivery Workshop May 7-8, 2003 Crystal City, Virginia Breakout Session - Bulk Hydrogen Storage Main ThemesCaveats Bulk...

123

RAPID/BulkTransmission/Power Plant | Open Energy Information  

Open Energy Info (EERE)

BulkTransmissionPower Plant < RAPID | BulkTransmission Jump to: navigation, search RAPID Regulatory and Permitting Information Desktop Toolkit BETA RAPID Toolkit About Bulk...

124

Nanofluidics, from bulk to interfaces  

E-Print Network (OSTI)

Nanofluidics has emerged recently in the footsteps of microfluidics, following the quest of scale reduction inherent to nanotechnologies. By definition, nanofluidics explores transport phenomena of fluids at the nanometer scales. Why is the nanometer scale specific ? What fluid properties are probed at nanometric scales ? In other words, why 'nanofluidics' deserves its own brand name ? In this critical review, we will explore the vast manifold of length scales emerging for the fluid behavior at the nanoscales, as well as the associated mechanisms and corresponding applications. We will in particular explore the interplay between bulk and interface phenomena. The limit of validity of the continuum approaches will be discussed, as well as the numerous surface induced effects occuring at these scales, from hydrodynamic slippage to the various electro-kinetic phenomena originating from the couplings between hydrodynamics and electrostatics. An enlightening analogy between ion transport in nanochannels and transport in doped semi-conductors will be discussed.

Lyderic Bocquet; Elisabeth Charlaix

2009-09-03T23:59:59.000Z

125

Energy Level Alignment in PCDTBT:PC70BM Solar Cells: Solution Processed NiOx for Improved Hole Collection and Efficiency  

SciTech Connect

Solution-based NiO{sub x} outperforms PEDOT:PSS in device performance and stability when used as a hole-collection layer in bulk-heterojunction (BHJ) solar cells formed with poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT) and PC70BM. The origin of the enhancement is clarified by studying the interfacial energy level alignment between PCDTBT or the 1:4 blended heterojunctions and PEDOT:PSS or NiO{sub x} using ultraviolet and inverse photoemission spectroscopies. The 1.6 eV electronic gap of PEDOT:PSS and energy level alignment with the BHJ result in poor hole selectivity of PEDOT:PSS and allows electron recombination at the PEDOT:PSS/BHJ interface. Conversely, the large band gap (3.7 eV) of NiO{sub x} and interfacial dipole (0.6 eV) with the organic active layer leads to a hole-selective interface. This interfacial dipole yields enhanced electron blocking properties by increasing the barrier to electron injection. The presence of such a strong dipole is predicted to further promote hole collection from the organic layer into the oxide, resulting in increased fill factor and short circuit current. An overall decrease in recombination is manifested in an increase in open circuit voltage and power conversion efficiency of the device on NiO{sub x} versus PEDOT:PSS interlayers.

Ratcliff, E. L.; Meyer, J.; Steirer, K. X.; Armstrong, N. R.; Olson, D.; Kahn, A.

2012-05-01T23:59:59.000Z

126

Synthesis and Characterization of Bulk Vitreous Cadmium Germanium...  

NLE Websites -- All DOE Office Websites (Extended Search)

Bulk Vitreous Cadmium Germanium Arsenide. Synthesis and Characterization of Bulk Vitreous Cadmium Germanium Arsenide. Abstract: Abstract Cadmium-germanium-diarsenide...

127

Bulk viscosity of a pion gas  

Science Journals Connector (OSTI)

We compute the bulk viscosity of a gas of pions at temperatures below the QCD crossover temperature, for the physical value of m?, to lowest order in chiral perturbation theory. Bulk viscosity is controlled by number-changing processes which become exponentially slow at low temperatures when the pions become exponentially dilute, leading to an exponentially large bulk viscosity ?~(F08/m?5)exp(2m?/T), where F0?93?MeV is the pion decay constant.

Egang Lu and Guy D. Moore

2011-04-07T23:59:59.000Z

128

Hyperon bulk viscosity in strong magnetic fields  

SciTech Connect

We study the bulk viscosity of neutron star matter including {lambda} hyperons in the presence of quantizing magnetic fields. Relaxation time and bulk viscosity due to both the nonleptonic weak process involving {lambda} hyperons and direct Urca processes are calculated here. In the presence of a strong magnetic field of 10{sup 17} G, the hyperon bulk viscosity coefficient is reduced, whereas bulk viscosity coefficients due to direct Urca processes are enhanced compared with their field free cases when many Landau levels are populated by protons, electrons, and muons.

Sinha, Monika; Bandyopadhyay, Debades [Theory Division and Centre for Astroparticle Physics, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata-700064 (India)

2009-06-15T23:59:59.000Z

129

Bulk viscosity in kaon condensed matter  

E-Print Network (OSTI)

We investigate the effect of $K^-$ condensed matter on bulk viscosity and r-mode instability in neutron stars. The bulk viscosity coefficient due to the non-leptonic process $n \\rightleftharpoons p + K^-$ is studied here. In this connection, equations of state are constructed within the framework of relativistic field theoretical models where nucleon-nucleon and kaon-nucleon interactions are mediated by the exchange of scalar and vector mesons. We find that the bulk viscosity coefficient due to the non-leptonic weak process in the condensate is suppressed by several orders of magnitude. Consequently, kaon bulk viscosity may not damp the r-mode instability in neutron stars.

Debarati Chatterjee; Debades Bandyopadhyay

2007-02-09T23:59:59.000Z

130

Oxygen penetration into the bulk of palladium  

Science Journals Connector (OSTI)

Oxygen penetration into the bulk of palladium ... During heating, the reaction rate exhibited an activity maximum at 650 K, whereas no activity maximum was found during the ... ...

C. T. Campbell; D. C. Foyt; J. M. White

1977-01-01T23:59:59.000Z

131

Commercialization of Bulk Thermoelectric Materials for Power...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

& Publications Commercialization of Bulk Thermoelectric Materials for Power Generation Hydrogen Embrittlement of Pipeline Steels: Causes and Remediation Distributed Bio-Oil...

132

Nanostructured High Temperature Bulk Thermoelectric Energy Conversion...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Efficient Automotive Waste Heat Recovery Multi-physics modeling of thermoelectric generators for waste heat recovery applications Nanostructured High-Temperature Bulk...

133

Applications of bulk high-temperature superconductors  

SciTech Connect

The development of high-temperature superconductors (HTSs) can be broadly generalized into thin-film electronics, wire applications, and bulk applications. We consider bulk HTSs to include sintered or crystallized forms that do not take the geometry of filaments or tapes, and we discuss major applications for these materials. For the most part applications may be realized with the HTSs cooled to 77 K, and the properties of the bulk HTSs are often already sufficient for commercial use. A non-exhaustive list of applications for bulk HTSs includes trapped field magnets, hysteresis motors, magnetic shielding, current leads, and magnetic bearings. These applications are briefly discussed in this paper.

Hull, J.R.

1995-06-01T23:59:59.000Z

134

Recent Device Developments with Advanced Bulk Thermoelectric...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

at RTI Reviews work in engineered thin-film nanoscale thermoelectric materials and nano-bulk materials with high ZT undertaken by RTI in collaboration with its research...

135

Phonon blocking by two dimensional electron gas in polar CdTe/PbTe heterojunctions  

SciTech Connect

Narrow-gap lead telluride crystal is an important thermoelectric and mid-infrared material in which phonon functionality is a critical issue to be explored. In this Letter, efficient phonon blockage by forming a polar CdTe/PbTe heterojunction is explicitly observed by Raman scattering. The unique phonon screening effect can be interpreted by recent discovery of high-density two dimensional electrons at the polar CdTe/PbTe(111) interface which paves a way for design and fabrication of thermoelectric devices.

Zhang, Bingpo; Cai, Chunfeng; Zhu, He; Wu, Feifei; Ye, Zhenyu; Chen, Yongyue; Li, Ruifeng; Kong, Weiguang; Wu, Huizhen, E-mail: hzwu@zju.edu.cn [Department of Physics and State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, Zhejiang 310027 (China)

2014-04-21T23:59:59.000Z

136

Indium tin oxide and indium phosphide heterojunction nanowire array solar cells  

SciTech Connect

Heterojunction solar cells were formed with a position-controlled InP nanowire array sputtered with indium tin oxide (ITO). The ITO not only acted as a transparent electrode but also as forming a photovoltaic junction. The devices exhibited an open-circuit voltage of 0.436?V, short-circuit current of 24.8?mA/cm{sup 2}, and fill factor of 0.682, giving a power conversion efficiency of 7.37% under AM1.5?G illumination. The internal quantum efficiency of the device was higher than that of the world-record InP cell in the short wavelength range.

Yoshimura, Masatoshi, E-mail: yoshimura@rciqe.hokudai.ac.jp; Nakai, Eiji; Fukui, Takashi [Graduate School of Information Science and Technology, and Research Center for Integrated Quantum Electronics (RCIQE), Hokkaido University, Kita 13 Nishi 8, Sapporo 060–8628 (Japan)] [Graduate School of Information Science and Technology, and Research Center for Integrated Quantum Electronics (RCIQE), Hokkaido University, Kita 13 Nishi 8, Sapporo 060–8628 (Japan); Tomioka, Katsuhiro [Graduate School of Information Science and Technology, and Research Center for Integrated Quantum Electronics (RCIQE), Hokkaido University, Kita 13 Nishi 8, Sapporo 060–8628 (Japan) [Graduate School of Information Science and Technology, and Research Center for Integrated Quantum Electronics (RCIQE), Hokkaido University, Kita 13 Nishi 8, Sapporo 060–8628 (Japan); PRESTO, Japan Science and Technology Agency (JST), Honcho Kawaguchi, 332–0012 Saitama (Japan)

2013-12-09T23:59:59.000Z

137

Crystal Silicon Heterojunction Solar Cells by Hot-Wire CVD: Preprint  

SciTech Connect

Hot-wire chemical vapor deposition (HWCVD) is a promising technique for fabricating Silicon heterojunction (SHJ) solar cells. In this paper we describe our efforts to increase the open circuit voltage (Voc) while improving the efficiency of these devices. On p-type c-Si float-zone wafers, we used a double heterojunction structure with an amorphous n/i contact to the top surface and an i/p contact to the back surface to obtain an open circuit voltage (Voc) of 679 mV in a 0.9 cm2 cell with an independently confirmed efficiency of 19.1%. This is the best reported performance for a cell of this configuration. We also made progress on p-type CZ wafers and achieved 18.7% independently confirmed efficiency with little degradation under prolong illumination. Our best Voc for a p-type SHJ cell is 0.688 V, which is close to the 691 mV we achieved for SHJ cells on n type c-Si wafers.

Wang, Q.; Page, M. R.; Iwaniczko, E.; Xu, Y. Q.; Roybal, L.; Bauer, R.; To, B.; Yuan, H. C.; Duda, A.; Yan, Y. F.

2008-05-01T23:59:59.000Z

138

Self-Assembled Micro-Honeycomb Network of Single-Walled Carbon Nanotubes for Heterojunction Solar Cell  

E-Print Network (OSTI)

Self-Assembled Micro-Honeycomb Network of Single-Walled Carbon Nanotubes for Heterojunction Solar. Here, we propose a self-organized micro- honeycomb network structure of SWNTs obtained by water@photon.t.u-tokyo.ac.jp) Various forms of nano-carbon films such as random network of single-walled carbon nanotubes (SWNTs

Maruyama, Shigeo

139

19.2% Efficient InP Heterojunction Solar Cell with Electron-Selective TiO2 Contact  

E-Print Network (OSTI)

19.2% Efficient InP Heterojunction Solar Cell with Electron-Selective TiO2 Contact Xingtian Yin of California, Berkeley, California 94720, United States Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States § Electronic Materials Research Laboratory

Javey, Ali

140

Controlled CVD Growth of Single-Walled Carbon Nanotubes and Application to CNT-Si Heterojunction Solar Cells  

E-Print Network (OSTI)

Solar Cells Shigeo Maruyama Department of Mechanical Engineering, The University of Tokyo 113 controlled assembly of SWNTs for SWNT-Si heterojunction solar cells will be discussed. We found SWNTs to a self-assembled micro- honeycomb network for the application of solar cells [4]. The micro

Maruyama, Shigeo

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Hole-conductor-free perovskite organic lead iodide heterojunction thin-film solar cells: High efficiency and junction property  

E-Print Network (OSTI)

Hole-conductor-free perovskite organic lead iodide heterojunction thin-film solar cells: High-conductor-free organic lead iodide thin film solar cells have been fabricated with a sequential deposition method are comparable to that of the high-efficiency thin-film solar cells. VC 2014 AIP Publishing LLC. [http

Wang, Wei Hua

142

Robust Superlubricity in Graphene/hBN Heterojunctions Itai Leven, Dana Krepel, Ortal Shemesh, and Oded Hod*  

E-Print Network (OSTI)

Robust Superlubricity in Graphene/hBN Heterojunctions Itai Leven, Dana Krepel, Ortal Shemesh: The sliding energy landscape of the heterogeneous graphene/h- BN interface is studied by means of the registry index. For a graphene flake sliding on top of h-BN, the anisotropy of the sliding energy corrugation

Hod, Oded

143

Built-in voltage of organic bulk heterojuction p-i-n solar cells measured by electroabsorption spectroscopy  

SciTech Connect

We investigate the influence of the built-in voltage on the performance of organic bulk heterojuction solar cells that are based on a p-i-n structure. Electrical doping in the hole and the electron transport layer allows to tune their work function and hence to adjust the built-in voltage: Changing the doping concentration from 0.5 to 32 wt% induces a shift of the work function towards the transport levels and increases the built-in voltage. To determine the built-in voltage, we use electroabsorption spectroscopy which is based on an evaluation of the spectra caused by a change in absorption due to an electric field (Stark effect). For a model system with a bulk heterojunction of BF-DPB and C{sub 60}, we show that higher doping concentrations in both the electron and the hole transport layer increase the built-in voltage, leading to an enhanced short circuit current and solar cell performance.

Siebert-Henze, E., E-mail: ellen.siebert@iapp.de; Lyssenko, V. G.; Fischer, J.; Tietze, M.; Brueckner, R.; Schwarze, M.; Vandewal, K.; Ray, D.; Riede, M.; Leo, K. [Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden (Germany)] [Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden (Germany)

2014-04-15T23:59:59.000Z

144

Bulk viscosity of a pion gas  

SciTech Connect

We compute the bulk viscosity of a gas of pions at temperatures below the QCD crossover temperature, for the physical value of m{sub {pi}}, to lowest order in chiral perturbation theory. Bulk viscosity is controlled by number-changing processes which become exponentially slow at low temperatures when the pions become exponentially dilute, leading to an exponentially large bulk viscosity {zeta}{approx}(F{sub 0}{sup 8}/m{sub {pi}}{sup 5})exp(2m{sub {pi}}/T), where F{sub 0}{approx_equal}93 MeV is the pion decay constant.

Lu Egang; Moore, Guy D. [Department of Physics, McGill University, 3600 rue University, Montreal, Quebec, H3A 2T8 (Canada)

2011-04-15T23:59:59.000Z

145

The Bulk Viscosity of a Pion Gas  

E-Print Network (OSTI)

We compute the bulk viscosity of a gas of pions at temperatures below the QCD crossover temperature, for the physical value of pion mass, to lowest order in chiral perturbation theory. Bulk viscosity is controlled by number-changing processes which become exponentially slow at low temperatures when the pions become exponentially dilute, leading to an exponentially large bulk viscosity zeta ~ (F_0^8/m_\\pi^5) exp(2m_\\pi/T), where F_0 = 93 MeV is the pion decay constant.

Egang Lu; Guy D. Moore

2011-01-31T23:59:59.000Z

146

Band alignment and interfacial structure of ZnO/Si heterojunction with Al{sub 2}O{sub 3} and HfO{sub 2} as interlayers  

SciTech Connect

Energy band alignment of ZnO/Si heterojunction with thin interlayers Al{sub 2}O{sub 3} and HfO{sub 2} grown by atomic layer deposition has been studied using x-ray photoelectron spectroscopy. The valence band offsets of ZnO/Al{sub 2}O{sub 3} and ZnO/HfO{sub 2} heterojunctions have been determined to be 0.43 and 0.22?eV, respectively. Accordingly, the band alignment ZnO/Si heterojunction is then modified to be 0.34 and 0.50?eV through inserting a thin Al{sub 2}O{sub 3} and HfO{sub 2} layer, respectively. The feasibility to tune the band structure of ZnO/Si heterojunction by selecting a proper interlayer shows great advantage in improving the performance of the ZnO-based optoelectronic devices.

Lu, Hong-Liang, E-mail: honglianglu@fudan.edu.cn; Yang, Ming; Xie, Zhang-Yi; Geng, Yang; Zhang, Yuan; Wang, Peng-Fei; Sun, Qing-Qing; Ding, Shi-Jin; Wei Zhang, David [State Key Laboratory of ASIC and System, Institute of Advanced Nanodevices, School of Microelectronics, Fudan University, Shanghai 200433 (China)

2014-04-21T23:59:59.000Z

147

Definition: Bulk Electric System | Open Energy Information  

Open Energy Info (EERE)

Bulk Electric System Bulk Electric System Jump to: navigation, search Dictionary.png Bulk Electric System As defined by the Regional Reliability Organization, the electrical generation resources, transmission lines, interconnections with neighboring systems, and associated equipment, generally operated at voltages of 100 kV or higher. Radial transmission facilities serving only load with one transmission source are generally not included in this definition.[1] Related Terms Regional Reliability Organization, transmission lines, transmission line References ↑ Glossary of Terms Used in Reliability Standards An in LikeLike UnlikeLike You like this.Sign Up to see what your friends like. line Glossary Definition Retrieved from "http://en.openei.org/w/index.php?title=Definition:Bulk_Electric_System&oldid=48030

148

Bulk Viscosity of a Pion Gas  

SciTech Connect

We calculate the bulk viscosity of a pion gas at low energies within the kinetic theory approach and show the importance of dealing properly with the zero modes of this transport coefficient.

Dobado, Antonio; Torres-Rincon, Juan M. [Dpto. Fisica Teorica I, Universidad Complutense de Madrid, 28040 Madrid (Spain)

2011-05-23T23:59:59.000Z

149

Effects of bulk viscosity at freezeout  

SciTech Connect

We investigate particle spectra and elliptic flow coefficients in relativistic heavy-ion collisions by taking into account the distortion of phase space distributions by bulk viscosity at freezeout. We first calculate the distortion of phase space distributions in a multicomponent system with Grad's 14-moment method. We find some subtle issues when macroscopic variables are matched with microscopic momentum distributions in a multicomponent system, and we develop a consistent procedure to uniquely determine the corrections to the phase space distributions. Next, we calculate particle spectra by using the Cooper-Frye formula to see the effect of the bulk viscosity. Despite the relative smallness of the bulk viscosity, we find that it is likely to have a visible effect on particle spectra and elliptic flow coefficients. This indicates the importance of taking into account bulk viscosity together with shear viscosity to constrain the transport coefficients with better accuracy from comparison with experimental data.

Monnai, Akihiko; Hirano, Tetsufumi [Department of Physics, University of Tokyo, Tokyo 113-0033 (Japan)

2009-11-15T23:59:59.000Z

150

Texas Bulk Power Study-- An Overview  

E-Print Network (OSTI)

TEXAS BULK POWER STUDY -- AN OVERVIEW BIll MOORE Economist Publ ic Utility Commission of Texas Austin, Texas ABSTRACT In the 1980' s, several signi ficant changes have evolved in markets for electric power in Texas. Cogeneration, fuel... of bulk power transactions may reduce some uncertainty and result in cost savings to the util ities involved. However, both the transactions potential and any corresponding changes in operating costs are quite sensitive to assumptions about the price...

Moore, B.

151

Enhancing the Performance of Solution-Processed Bulk-Heterojunction Solar Cells Using Hydrogen-Bonding-Induced Self-Organization of Small Molecules  

Science Journals Connector (OSTI)

Small-molecule solar-cell performance is highly sensitive to the crystallinity and intermolecular connectivity of the molecules. In order to enhance the crystallinity for the solution-processed small molecule, it is possible to make use of carboxylic acid ...

Kwan Hang Lam; Thelese Ru Bao Foong; Zi En Ooi; Jie Zhang; Andrew Clive Grimsdale; Yeng Ming Lam

2013-11-11T23:59:59.000Z

152

RAPID/BulkTransmission/Land Access | Open Energy Information  

Open Energy Info (EERE)

Information Desktop Toolkit BETA RAPID Toolkit About Bulk Transmission Geothermal Solar Tools Contribute Contact Us RAPID Bulk Transmission Land Access Regulatory...

153

RAPID/BulkTransmission/Siting/New Mexico | Open Energy Information  

Open Energy Info (EERE)

Solar Resources Contribute Contact Us RAPID Bulk Transmission Siting New Mexico Bulk Transmission Siting in New Mexico Regulatory Information Overviews Search for...

154

High Heat Flux Thermoelectric Module Using Standard Bulk Material...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Heat Flux Thermoelectric Module Using Standard Bulk Material High Heat Flux Thermoelectric Module Using Standard Bulk Material Presents high heat flux thermoelectric module design...

155

RAPID/Overview/BulkTransmission/Siting/Colorado | Open Energy...  

Open Energy Info (EERE)

Colorado < RAPID | Overview | BulkTransmission | Siting(Redirected from RAPIDAtlasBulkTransmissionSitingColorado) Redirect page Jump to: navigation, search REDIRECT...

156

Bulk Hydrogen Storage - Strategic Directions for Hydrogen Delivery...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Bulk Hydrogen Storage - Strategic Directions for Hydrogen Delivery Workshop Bulk Hydrogen Storage - Strategic Directions for Hydrogen Delivery Workshop Targets, barriers and...

157

Nanostructured High-Temperature Bulk Thermoelectric Energy Conversion...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Nanostructured High-Temperature Bulk Thermoelectric Energy Conversion for Efficient Automotive Waste Heat Recovery Nanostructured High-Temperature Bulk Thermoelectric Energy...

158

RAPID/BulkTransmission/Water Use | Open Energy Information  

Open Energy Info (EERE)

RAPIDBulkTransmissionWater Use < RAPID | BulkTransmission Jump to: navigation, search RAPID Regulatory and Permitting Information Desktop Toolkit BETA RAPID Toolkit About Bulk...

159

InGaAs/InP heterojunction bipolar transistors for ultra-low power circuit applications  

SciTech Connect

For many modern day portable electronic applications, low power high speed devices have become very desirable. Very high values of f{sub T} and f{sub MAX} have been reported with InGaAs/InP heterojunction bipolar transistors (HBTs), but only under high bias and high current level operating conditions. An InGaAs/InP ultra-lowpower HBT with f{sub MAX} greater than 10 GHz operating at less than 20 {micro}A has been reported for the first time in this work. The results are obtained on a 2.5 x 5 {micro}m{sup 2} device, corresponding to less than 150 A/cm{sup 2} of current density. These are the lowest current levels at which f{sub MAX} {ge} 10 GHz has been reported.

Chang, P.C.; Baca, A.G.; Hafich, M.J.; Ashby, C.I.

1998-08-01T23:59:59.000Z

160

Photocurrent enhancement of perovskite heterojunction by plasmonic nanoparticles and ferroelectric polarization  

SciTech Connect

Perovskite oxides—Pb{sub 0.86}La{sub 0.14}TiO{sub 3} (PLT), AgNbO{sub 3} (ANO), and SrTiO{sub 3} (STO)—were deposited consecutively on ITO/glass substrates to form layered composite photoelectrodes. These materials were chosen for their specific electronic band structures to form efficient photocatalytic heterojunctions and similar crystalline structures to minimize interface defects. Two additional methods were adopted to increase the photocurrent density of the composites: (1) plasmonic gold nanoparticles were introduced at the PLT/ITO interface to enhance light scattering and absorption while not becoming electron trapping centers and (2) the ferroelectric PLT layer was electrically poled toward the ANO layer to create a favorable band bending for electron transfer.

Shieh, J., E-mail: jayshieh@ntu.edu.tw; Chen, S. W.; Fang, C. Y.; Chen, C. H. [Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan (China)

2014-02-17T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Thin film heterojunction photovoltaic cells and methods of making the same  

DOE Patents (OSTI)

A method of fabricating a thin film heterojunction photovoltaic cell which comprises depositing a film of a near intrinsic or n-type semiconductor compound formed of at least one of the metal elements of Class II B of the Periodic Table of Elements and at least tellurium and then heating said film at a temperature between about 250.degree. C. and 500.degree. C. for a time sufficient to convert said film to a suitably low resistivity p-type semiconductor compound. Such film may be deposited initially on the surface of an n-type semiconductor substrate. Alternatively, there may be deposited on the converted film a layer of n-type semiconductor compound different from the film semiconductor compound. The resulting photovoltaic cell exhibits a substantially increased power output over similar cells not subjected to the method of the present invention.

Basol, Bulent M. (Los Angeles, CA); Tseng, Eric S. (Los Angeles, CA); Rod, Robert L. (Los Angeles, CA)

1983-06-14T23:59:59.000Z

162

Infrared electroluminescence from GeSn heterojunction diodes grown by molecular beam epitaxy  

SciTech Connect

Infrared electroluminescence was observed from GeSn/Ge p-n heterojunction diodes with 8% Sn, grown by molecular beam epitaxy. The GeSn layers were boron doped, compressively strained, and pseudomorphic on Ge substrates. Spectral measurements indicated an emission peak at 0.57 eV, about 50 meV wide, increasing in intensity with applied pulsed current, and with reducing device temperatures. The total integrated emitted power from a single edge facet was 54 {mu}W at an applied peak current of 100 mA at 100 K. These results suggest that GeSn-based materials maybe useful for practical light emitting diodes operating in the infrared wavelength range near 2 {mu}m.

Gupta, Jay Prakash; Bhargava, Nupur; Kim, Sangcheol; Kolodzey, James [Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716 (United States)] [Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716 (United States); Adam, Thomas [Nanofab, University of Albany, SUNY, Albany, New York 12203 (United States)] [Nanofab, University of Albany, SUNY, Albany, New York 12203 (United States)

2013-06-24T23:59:59.000Z

163

Quantum dot Ge/TiO{sub 2} heterojunction photoconductor fabrication and performance  

SciTech Connect

Spun cast TiO{sub 2}-Ge quantum dot (QD) heterojunction type photodetectors have been fabricated and characterized, with interest paid to photocurrent enhancements related to device design. Performance as a function of absorber layer thickness, QD size, and back contact is investigated. We have achieved ultra-thin (?200?nm) devices with photocurrents at 0.5?V of 10{sup ?4} A cm{sup ?2} while the thickest devices have photocurrents at 0.5?V of 10{sup ?2} A cm{sup ?2} with on-off ratios >100, which represents 5 orders of magnitude increase in photocurrents over previously fabricated Ge QD devices. At 0.5?V bias, the currents in our devices are competitive with thin-film Ge photovoltaics.

Church, Carena P.; Carter, Sue A., E-mail: sacarter@ucsc.edu [Department of Physics, University of California Santa Cruz, Santa Cruz, California 95064 (United States); Muthuswamy, Elayaraja; Kauzlarich, Susan M. [Department of Chemistry, University of California Davis, Davis, California 95616 (United States)] [Department of Chemistry, University of California Davis, Davis, California 95616 (United States); Zhai, Guangmei [Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Science and Technology, Taiyuan, Shanxi 030024 (China)] [Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Science and Technology, Taiyuan, Shanxi 030024 (China)

2013-11-25T23:59:59.000Z

164

Organic thin film prehistory: looking towards solution phase aggregation |  

NLE Websites -- All DOE Office Websites (Extended Search)

Organic thin film prehistory: looking towards solution phase aggregation Organic thin film prehistory: looking towards solution phase aggregation Wednesday, November 6, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Christopher Tassone, SSRL Polymer bulk heterojunction (BHJ) solar cells have attracted significant attention in industry and academia because of their potential for achieving large-area, light-weight, and flexible photovoltaic devices through cost-effective solution deposition techniques. These devices consist of a blend of an absorbing polymer and an electron accepting fullerene, the molecular packing and phase segregation of which heavily influence power conversion efficiency by effecting important processes such as exciton splitting, charge transport, and recombination. Understanding and utilization of molecular interactions to predicatively control the

165

A New Center for Organic Electronics at Masdar Institute | Stanford  

NLE Websites -- All DOE Office Websites (Extended Search)

A New Center for Organic Electronics at Masdar Institute A New Center for Organic Electronics at Masdar Institute Friday, August 2, 2013 - 10:00am SLAC, Conference Room 137-322 Presented by Samuele Lilliu Masdar Institute is a graduate level, research-oriented university, which is focused on alternative energy, sustainability, and the environment. It is located in Masdar City in Abu Dhabi, United Arab Emirates. The project here outlined focuses on improving the performance of organic/hybrid bulk heterojunction (BHJ) photodetectors, both solar cells (OPVs) and photodiodes (OPDs). The program involves several professors at Masdar Institute with diverse background. It exploits collaborations with several academic institutions and companies. The project has unofficially started in the late 2012 under the direction of Dr. Samuele Lilliu. The

166

4 - Bulk high temperature superconductor (HTS) materials  

Science Journals Connector (OSTI)

Abstract: This chapter concentrates on bulk materials. A bulk superconductor is one in which the superconductor has been formed into a lump, usually cylindrically shaped, but can also be hexagonal, rectangular or even square. Bulk superconductors are typically 3–5 cm across and 1 cm thick. They have many uses but the principal one is as extremely compact high-field permanent magnets in superconducting machines. A 2.6 cm (RE)BCO puck has been magnetised to 17.24 T: this is an order of magnitude greater than the flux density available from a conventional permanent magnet. This chapter describes the materials, manufacturing process, magnetisation process and some examples of machines.

T. Coombs

2012-01-01T23:59:59.000Z

167

Features of the electroluminescence spectra of quantum-confined silicon p{sup +}-n heterojunctions in the infrared spectral region  

SciTech Connect

The results of studying the characteristics of optical emission in various regions of quantum-confined silicon p{sup +}-n heterojunctions heavily doped with boron are analyzed. The results obtained allow one to conclude that near-infrared electroluminescence arises near the heterointerface between the nanostructured wide-gap silicon p{sup +}-barrier heavily doped with boron and n-type silicon (100), the formation of which included the active involvement of boron dipole centers.

Bagraev, N. T.; Klyachkin, L. E.; Kuzmin, R. V., E-mail: roman.kuzmin@mail.ioffe.ru; Malyarenko, A. M. [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation)] [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation); Mashkov, V. A. [Saint Petersburg State Polytechnical University (Russian Federation)] [Saint Petersburg State Polytechnical University (Russian Federation)

2013-11-15T23:59:59.000Z

168

Well-Passivated a-Si:H Back Contacts for Double-Heterojunction Silicon Solar Cells: Preprint  

SciTech Connect

We have developed hydrogenated amorphous silicon (a Si:H) back contacts to both p- and n-type silicon wafers, and employed them in double-heterojunction solar cells. These contacts are deposited entirely at low temperature (<250 C) and replace the standard diffused or alloyed back-surface-field contacts used in single-heterojunction (front-emitter only) cells. High-quality back contacts require excellent surface passivation, indicated by a low surface recombination velocity of minority-carriers (S) or a high open-circuit voltage (Voc). The back contact must also provide good conduction for majority carriers to the external circuit, as indicated by a high light I-V fill factor. We use hot-wire chemical vapor deposition (HWCVD) to grow a-Si:H layers for both the front emitters and back contacts. Our improved a-Si:H back contacts contribute to our recent achievement of a confirmed 18.2% efficiency in double-heterojunction silicon solar cells on p type textured silicon wafers.

Page, M. R.; Iwaniczko, E.; Xu, Y.; Wang, Q.; Yan, Y.; Roybal, L.; Branz, H. M.; Wang, T. H.

2006-05-01T23:59:59.000Z

169

Bulk viscosity in a cold CFL superfluid  

E-Print Network (OSTI)

We compute one of the bulk viscosity coefficients of cold CFL quark matter in the temperature regime where the contribution of mesons, quarks and gluons to transport phenomena is Boltzmann suppressed. In that regime dissipation occurs due to collisions of superfluid phonons, the Goldstone modes associated to the spontaneous breaking of baryon symmetry. We first review the hydrodynamics of relativistic superfluids, and remind that there are at least three bulk viscosity coefficients in these systems. We then compute the bulk viscosity coefficient associated to the normal fluid component of the superfluid. In our analysis we use Son's effective field theory for the superfluid phonon, amended to include scale breaking effects proportional to the square of the strange quark mass m_s. We compute the bulk viscosity at leading order in the scale breaking parameter, and find that it is dominated by collinear splitting and joining processes. The resulting transport coefficient is zeta=0.011 m_s^4/T, growing at low temperature T until the phonon fluid description stops making sense. Our results are relevant to study the rotational properties of a compact star formed by CFL quark matter.

Cristina Manuel; Felipe Llanes-Estrada

2007-05-26T23:59:59.000Z

170

Next-Generation Photovoltaic Technologies  

NLE Websites -- All DOE Office Websites (Extended Search)

Next-Generation Photovoltaic Next-Generation Photovoltaic Technologies Next-Generation Photovoltaic Technologies Print Monday, 06 February 2012 15:48 Organic solar cells based on the polymer/fullerene bulk heterojunction (BHJ) model represent one of the most promising technologies for next-generation solar energy conversion due to their low cost and scalability. Traditional organic photovoltaics (OPVs) are thought to have interpenetrating networks of pure polymer and fullerene layers with discrete interfaces. Researchers at Argonne National Laboratory, working with collaborators from the University of Chicago, LBNL, and NIST, used ALS Beamline 11.0.1.2 to perform resonant soft x-ray scattering (RSoXS) on PTB7/fullerene BHJ solar cells to probe performance-related structures at different length scales. These solar cells set a historic record of conversion efficiency (7.4%). The RSoXS demonstrated that the superior performance of PTB7/fullerene solar cells is attributed to surprising hierarchical nanomorphologies ranging from several nanometers of crystallites to tens of nanometers of nanocrystallite aggregates in intermixed PTB7-rich and fullerene-rich domains, themselves hundreds of nanometers in size. This work will lead the research community to rethink ideal OPV morphologies, reconsider which structures should be targeted in OPVs, and enable the rational design of even higher-performance organic solar cells.

171

Photoconductivity measurements of the electronic structure of organic solar cells  

Science Journals Connector (OSTI)

Experimental and theoretical studies of the electronic structure of bulk heterojunction (BHJ) organic solar cells are reported. The photoconductivity spectral response of the solar cells has a weak absorption band extending from the band-gap energy down to <1 eV due to charge-transfer optical excitation at the interface between the polymer and the fullerene. The low-energy absorption indicates an exponential band tail of localized states and an absorption model based on the one-electron joint density of electronic states accounts for the data. Transient photoconductivity measurements of the carrier mobility exhibit a temperature-dependent carrier dispersion. Data analysis for the particular case of transport in the BHJ structure is developed. A multiple trapping model of the dispersive transport is consistent with localized band tail states having a comparable density-of-states distribution to those observed by optical absorption. Theoretical calculations of the density of states including disorder in the ?-? spacing of the polymer chains also shows exponential band tailing. A density-of-states model is developed from the data and is discussed.

R. A. Street; K. W. Song; J. E. Northrup; S. Cowan

2011-04-25T23:59:59.000Z

172

Analyzing local exciton generation profiles as a means to extract transport lengths in organic solar cells  

Science Journals Connector (OSTI)

In this work, we determine the carrier-transport lengths of electrons and holes (Le,h) for bulk heterojunction (BHJ) organic solar cells using a method applicable to functional devices. By linking the local exciton generation profile [G(x)] in the photoactive layer to photocurrent losses, we are able to determine the onset of bimolecular recombination, which is the dominate loss process of free carrier transport. Even though many factors affect photocurrent generation, we single out bimolecular recombination by measuring the scaling of photocurrent with light intensity as a function of applied voltage. For the common BHJ system, annealed poly-3-hexylthiophene:[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM), a minimum for Le in PCBM is found to be 340 nm while Lh is estimated to be 90 nm for P3HT. The relationship between G(x) and carrier transport is further exemplified by demonstrating a scaling exponent below that for traditional space-charge-limited photocurrent. Likewise, by incorporating a drift/diffusion model, an intuitive link between G(x) and charge transport is established where recombination is shown to occur in regions of the photoactive layer far from the electrode of the slowest carrier species. Finally, the consequences of Le,h on device design for operation under 1 Sun conditions are described.

John R. Tumbleston; Doo-Hyun Ko; Edward T. Samulski; Rene Lopez

2010-11-19T23:59:59.000Z

173

Layered insulator hexagonal boron nitride for surface passivation in quantum dot solar cell  

SciTech Connect

Single crystalline, two dimensional (2D) layered insulator hexagonal boron nitride (h-BN), is demonstrated as an emerging material candidate for surface passivation on mesoporous TiO{sub 2}. Cadmium selenide (CdSe) quantum dot based bulk heterojunction (BHJ) solar cell employed h-BN passivated TiO{sub 2} as an electron acceptor exhibits photoconversion efficiency ?46% more than BHJ employed unpassivated TiO{sub 2}. Dominant interfacial recombination pathways such as electron capture by TiO{sub 2} surface states and recombination with hole at valence band of CdSe are efficiently controlled by h-BN enabled surface passivation, leading to improved photovoltaic performance. Highly crystalline, confirmed by transmission electron microscopy, dangling bond-free 2D layered h-BN with self-terminated atomic planes, achieved by chemical exfoliation, enables efficient passivation on TiO{sub 2}, allowing electronic transport at TiO{sub 2}/h-BN/CdSe interface with much lower recombination rate compared to an unpassivated TiO{sub 2}/CdSe interface.

Shanmugam, Mariyappan; Jain, Nikhil; Jacobs-Gedrim, Robin; Yu, Bin, E-mail: byu@albany.edu [College of Nanoscale Science and Engineering, State University of New York, Albany, New York 12203 (United States)] [College of Nanoscale Science and Engineering, State University of New York, Albany, New York 12203 (United States); Xu, Yang [Institute of Microelectronics and Optoelectronics, Zhejiang University, Hangzhou 310027 (China)] [Institute of Microelectronics and Optoelectronics, Zhejiang University, Hangzhou 310027 (China)

2013-12-09T23:59:59.000Z

174

Achieving High Performance Polymer Tandem Solar Cells via Novel Materials Design  

E-Print Network (OSTI)

assisted preparation of narrow-bandgap conjugated polymers for high performance bulk heterojunction solar

Dou, Letian

2014-01-01T23:59:59.000Z

175

Bulk viscosity in heavy ion collision  

E-Print Network (OSTI)

The effect of a temperature dependent bulk viscosity to entropy density ratio~($\\zeta/s$) along with a constant shear viscosity to entropy density ratio~($\\eta/s$) on the space time evolution of the fluid produced in high energy heavy ion collisions have been studied in a relativistic viscous hydrodynamics model. The boost invariant Israel-Stewart theory of causal relativistic viscous hydrodynamics is used to simulate the evolution of the fluid in 2 spatial and 1 temporal dimension. The dissipative correction to the freezeout distribution for bulk viscosity is calculated using Grad's fourteen moment method. From our simulation we show that the method is applicable only for $\\zeta/s<0.004$.

Victor Roy; A. K. Chaudhuri

2012-01-20T23:59:59.000Z

176

Low temperature front surface passivation of interdigitated back contact silicon heterojunction solar cell  

SciTech Connect

The interdigitated back contact silicon heterojunction (IBC-SHJ) solar cell requires a low temperature front surface passivation/anti-reflection structure. Conventional silicon surface passivation using SiO2 or a-SiNx is performed at temperature higher than 400°C, which is not suitable for the IBC-SHJ cell. In this paper, we propose a PECVD a-Si:H/a-SiNx:H/a-SiC:H stack structure to passivate the front surface of crystalline silicon at low temperature. The optical properties and passivation quality of this structure are characterized and solar cells using this structure are fabricated. With 2 nm a-Si:H layer, the stack structure exhibits stable passivation with effective minority carrier lifetime higher than 2 ms, and compatible with IBC-SHJ solar cell processing. A critical advantage of this structure is that the SiC allows it to be HF resistant, thus it can be deposited as the first step in the process. This protects the a-Si/c-Si interface and maintains a low surface recombination velocity.

Shu, Brent; Das, Ujjwal; Jani, Omkar; Hegedus, Steve; Birkmire, Robert

2009-06-08T23:59:59.000Z

177

Methods for forming thin-film heterojunction solar cells from I-III-VI{sub 2}  

DOE Patents (OSTI)

An improved thin-film, large area solar cell, and methods for forming the same are disclosed, having a relatively high light-to-electrical energy conversion efficiency and characterized in that the cell comprises a p-n type heterojunction formed of: (i) a first semiconductor layer comprising a photovoltaic active material selected from the class of I-III-VI{sub 2} chalcopyrite ternary materials which is vacuum deposited in a thin ``composition-graded`` layer ranging from on the order of about 2.5 microns to about 5.0 microns ({approx_equal}2.5 {mu}m to {approx_equal}5.0 {mu}m) and wherein the lower region of the photovoltaic active material preferably comprises a low resistivity region of p-type semiconductor material having a superimposed region of relatively high resistivity, transient n-type semiconductor material defining a transient p-n homojunction; and (ii) a second semiconductor layer comprising a low resistivity n-type semiconductor material; wherein interdiffusion occurs (a) between the elemental constituents of the two discrete juxtaposed regions of the first semiconductor layer defining a transient p-n homojunction layer, and (b) between the transient n-type material in the first semiconductor layer and the second n-type semiconductor layer. 16 figs.

Mickelsen, R.A.; Chen, W.S.

1985-08-13T23:59:59.000Z

178

Asymmetric Electron Transport at Monolayer-Bilayer Heterojunctions of Epitaxial Graphene  

SciTech Connect

The symmetry of the graphene honeycomb lattice is a key element determining many of graphene s unique electronic properties, such as the linear energy-momentum dispersion and the suppressed backscattering 1,2. However, line defects in large-scale epitaxial graphene films, such as grain boundaries, edges, surface steps, and changes in layer thickness, often break the sublatttice symmetry and can impact transport properties of graphene profoundly 3-6. Here we report asymmetric electron transport upon polarity reversal at individual monolayer-bilayer (ML-BL) boundaries in epitaxial graphene on SiC (0001), revealed by scanning tunneling potentiometry. A greater voltage drop is observed when the current flows from BL to ML graphene than in the reverse direction, and the difference remains nearly unchanged with increasing current. This is not a typical nonlinear conductance due to electron transmission through an asymmetric potential. Rather, it indicates the opening of a dynamic energy gap at the Fermi energy due to the Coulomb interaction between the injected nonequilibrium electron density and the pseudospin polarized Friedel oscillation charge density at the boundary. This intriguing heterojunction transport behavior opens a new avenue towards novel quantum functions such as quantum switching.

Li, An-Ping [ORNL] [ORNL; Clark, Kendal W [ORNL] [ORNL; Zhang, Xiaoguang [ORNL] [ORNL; Gu, Gong [University of Tennessee, Knoxville (UTK)] [University of Tennessee, Knoxville (UTK); He, Guowei [Carnegie Mellon University (CMU)] [Carnegie Mellon University (CMU); Feenstra, Randall [Carnegie Mellon University (CMU)] [Carnegie Mellon University (CMU)

2014-01-01T23:59:59.000Z

179

Hetero-junction photovoltaic device and method of fabricating the device  

DOE Patents (OSTI)

A hetero-junction device and fabrication method in which phase-separated n-type and p-type semiconductor pillars define vertically-oriented p-n junctions extending above a substrate. Semiconductor materials are selected for the p-type and n-type pillars that are thermodynamically stable and substantially insoluble in one another. An epitaxial deposition process is employed to form the pillars on a nucleation layer and the mutual insolubility drives phase separation of the materials. During the epitaxial deposition process, the orientation is such that the nucleation layer initiates propagation of vertical columns resulting in a substantially ordered, three-dimensional structure throughout the deposited material. An oxidation state of at least a portion of one of the p-type or the n-type semiconductor materials is altered relative to the other, such that the band-gap energy of the semiconductor materials differ with respect to stoichiometric compositions and the device preferentially absorbs particular selected bands of radiation.

Aytug, Tolga; Christen, David K; Paranthaman, Mariappan Parans; Polat, Ozgur

2014-02-10T23:59:59.000Z

180

Methods for forming thin-film heterojunction solar cells from I-III-VI.sub. 2  

DOE Patents (OSTI)

An improved thin-film, large area solar cell, and methods for forming the same, having a relatively high light-to-electrical energy conversion efficiency and characterized in that the cell comprises a p-n type heterojunction formed of: (i) a first semiconductor layer comprising a photovoltaic active material selected from the class of I-III-VI.sub.2 chalcopyrite ternary materials which is vacuum deposited in a thin "composition-graded" layer ranging from on the order ot about 2.5 microns to about 5.0 microns (.congruent.2.5 .mu.m to .congruent.5.0 .mu.m) and wherein the lower region of the photovoltaic active material preferably comprises a low resistivity region of p-type semiconductor material having a superimposed region of relatively high resistivity, transient n-type semiconductor material defining a transient p-n homojunction; and (ii), a second semiconductor layer comprising a low resistivity n-type semiconductor material; wherein interdiffusion (a) between the elemental constituents of the two discrete juxtaposed regions of the first semiconductor layer defining a transient p-n homojunction layer, and (b) between the transient n-type material in the first semiconductor layer and the second n-type semiconductor layer, causes the The Government has rights in this invention pursuant to Contract No. EG-77-C-01-4042, Subcontract No. XJ-9-8021-1 awarded by the U.S. Department of Energy.

Mickelsen, Reid A. (Bellevue, WA) [Bellevue, WA; Chen, Wen S. (Seattle, WA) [Seattle, WA

1985-08-13T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Measurement of the valence band-offset in a PbSe/ZnO heterojunction by x-ray photoelectron spectroscopy  

SciTech Connect

A heterojunction of PbSe/ZnO has been grown by molecular beam epitaxy. X-ray photoelectron spectroscopy was used to directly measure the valence-band offset (VBO) of the heterojunction. The VBO, {Delta}E{sub V}, was determined as 2.51 {+-} 0.05 eV using the Pb 4p{sup 3/2} and Zn 2p{sup 3/2} core levels as a reference. The conduction-band offset, {Delta}E{sub C}, was, therefore, determined to be 0.59 {+-} 0.05 eV based on the above {Delta}E{sub V} value. This analysis indicates that the PbSe/ZnO heterojunction forms a type I (Straddling Gap) heterostructure.

Li Lin; Qiu Jijun; Weng Binbin; Yuan Zijian; Shi Zhisheng [School of Electrical and Computer Engineering, University of Oklahoma, Norman, Oklahoma 73019 (United States); Li Xiaomin; Gan Xiaoyan [State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China); Sellers, Ian R. [Deparment of Physics, University of Oklahoma, Norman, Oklahoma 73019 (United States)

2012-12-24T23:59:59.000Z

182

Influence of the backward-pump process on photon-number squeezing in a constant-current-driven heterojunction LED: Transition from thermionic emission to diffusion limits  

Science Journals Connector (OSTI)

Physical mechanisms which limit the squeezing bandwidth in a heterojunction light-emitting diode (LED) have been extensively studied both theoretically and experimentally. It is proven that our experimental results of pump-current dependence of the squeezing bandwidth in the constant-current-driven heterojunction LED at room temperature cannot be explained by previous theoretical predictions. We present a theoretical framework, including the effects of a microscopic backward-pump (BP) process, generally applicable to a heterojunction LED. Parameters describing the relative significance of the BP process are determined by the measurements of current-versus-voltage characteristic and differential resistance of the LED, independent of the noise measurements. As a consequence, the experimental results can be explained by our model in a unified manner over a whole range of injection current, and it is clarified that the pump situation of the LED moves continuously from thermionic emission to diffusion limits with increasing pump current.

Masahide Kobayashi; Masamichi Yamanishi; Hiroyuki Sumitomo; Yutaka Kadoya

1999-12-15T23:59:59.000Z

183

Determination of subband energies and 2DEG characteristics of Al{sub x}Ga{sub 1?x}N/GaN heterojunctions using variational method  

SciTech Connect

A physics-based model based on the variational method for analyzing the two dimensional electron gas (2DEG) characteristics of polar AlGaN/GaN heterojunctions is developed. The 2DEG carrier concentration, the first and second energy subbands, and the position of the Fermi energy level are calculated for various barrier thicknesses, Al mole fractions, background dopant concentrations, and gate voltages for gated AlGaN/GaN heterojunctions. The results are in good agreement with the data reported based on self-consistent method. Whereas the aforementioned report has dealt with specific values of Al mole fraction, barrier thickness, and unintentional doping level, the present work provides a basis for calculating the 2DEG characteristics for the full range of these parameters. Furthermore, according to the proposed model, the applicability of the triangular approximation of the quantum well in AlGaN/GaN heterojunctions is evaluated.

Manouchehri, Farzin; Valizadeh, Pouya; Kabir, M. Z., E-mail: kabir@encs.concordia.ca [Department of Electrical and Computer Engineering, Concordia University, Montreal, H3G 1M8 (Canada)

2014-03-15T23:59:59.000Z

184

High-Quality, Low-Cost Bulk Gallium Nitride Substrates  

Energy.gov (U.S. Department of Energy (DOE))

To develop ESG into a viable bulk growth process for GaN that is more scalable to large-area wafer manufacturing and able to produce cost-effective, high-quality bulk GaN substrates.

185

Nanostructured High-Temperature Bulk Thermoelectric Energy Conversion...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

More Documents & Publications Nanostructured High-Temperature Bulk Thermoelectric Energy Conversion for Efficient Automotive Waste Heat Recovery Vehicle Technologies Office...

186

Structural and photovoltaic properties of a-Si (SNc)/c-Si heterojunction fabricated by EBPVD technique  

SciTech Connect

In last two decades sculptured thin films are very attractive for researches. Some properties of these thin films, like high porosity correspondingly high large surface area, controlled morphology; bring into prominence on them. Sculptured thin films have wide application areas as electronics, optics, mechanics, magnetic and chemistry. Slanted nano-columnar (SnC) thin films are a type of sculptured thin films. In this investigation SnC thin films were growth on n-type crystalline Si(100) and p-type crystalline Si(111) via ultra-high vacuum electron beam evaporation technique. The structural and morphological properties of the amorphous silicon thin films were investigated by XRD, Raman and FE-SEM analysis. According to the XRD and Raman analysis the structure of thin film was amorphous and FE-SEM analysis indicated slanted nano-columns were formed smoothly. Slanted nano-columns a-Si/c-Si heterojunction were prepared as using a photovoltaic device. In this regard we were researched photovoltaic properties of these heterojunction with current-voltage characterization under dark and illumination conditions. Electrical parameters were determined from the current-voltage characteristic in the dark conditions zero-bias barrier height ?{sub B0}?=?0.83?1.00eV; diode ideality factor ??=?11.71?10.73; series resistance R{sub s}?=?260?31.1 k? and shunt resistance R{sub sh}?=?25.71?63.5 M? SnC a-Si/n-Si and SnC a-Si/p-Si heterojunctions shows a pretty good photovoltaic behavior about 10{sup 3}- 10{sup 4} times. The obtained photovoltaic parameters are such as short circuit current density J{sub sc} 83-40 mA/m{sup 2}, open circuit voltage V{sub oc} 900-831 mV.

Demiro?lu, D.; Kazmanli, K.; Urgen, M. [Department of Metallurgical and Materials Engineering, Istanbul Technical University, Ayaza?a 34469, Istanbul (Turkey); Tatar, B. [Faculty of Arts and Sciences, Department of Physics, Nam?k Kemal University, De?irmenalt?, Tekirda? (Turkey)

2013-12-16T23:59:59.000Z

187

The Economic Case for Bulk Energy Storage in Transmission Systems  

E-Print Network (OSTI)

The Economic Case for Bulk Energy Storage in Transmission Systems with High Percentages to Engineer the Future Electric Energy System #12;#12;The Economic Case for Bulk Energy Storage Economic Case for Bulk Energy Storage in Transmission Sys- tems with High Percentages of Renewable

188

Bulk viscosity and r-modes of neutron stars  

E-Print Network (OSTI)

The bulk viscosity due to the non-leptonic process involving hyperons in $K^-$ condensed matter is discussed here. We find that the bulk viscosity is modified in a superconducting phase. Further, we demonstrate how the exotic bulk viscosity coefficient influences $r$-modes of neutron stars which might be sources of detectable gravitational waves.

Debarati Chatterjee; Debades Bandyopadhyay

2008-08-08T23:59:59.000Z

189

Bulk viscosity of gauge theory plasma at strong coupling  

E-Print Network (OSTI)

We propose a lower bound on bulk viscosity of strongly coupled gauge theory plasmas. Using explicit example of the N=2^* gauge theory plasma we show that the bulk viscosity remains finite at a critical point with a divergent specific heat. We present an estimate for the bulk viscosity of QGP plasma at RHIC.

Alex Buchel

2007-08-27T23:59:59.000Z

190

Rescheduling Bulk Gas Production and Distribution Wasu Glankwamdee  

E-Print Network (OSTI)

customer demand at minimum cost? #12;Bulk Gas Wrinkles Production Most sites operate in two modes: RegularRescheduling Bulk Gas Production and Distribution Wasu Glankwamdee Jackie Griffin Jeff Linderoth March 15, 2006 #12;Liquid Bulk Gas Production-Distribution Sites S Products P = {LOX, LNI} Customers C

Grossmann, Ignacio E.

191

Hanford ETR Bulk Vitrification System - Demonstration Bulk Vitrification System (DBVS) Review Report  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

A Comprehensive Technical A Comprehensive Technical Review of the Demonstration Bulk Vitrification System Technical Assessment Conducted by an Independent and External Team of Experts Volume 1 September 28, 2006 Chartered by CH2M HILL Hanford Group, Inc. Richland, Washington 99352 RPP-31314 Executive Summary In May 2006, CH2M HILL Hanford Group, Inc. chartered an Expert Review Panel (ERP) to review the current status of the Demonstration Bulk Vitrification System (DBVS). It is the consensus of the ERP that bulk vitrification is a technology that requires further development and evaluation to determine its potential for meeting the Hanford waste stabilization mission. No fatal flaws (issues that would jeopardize the overall DBVS mission that cannot be mitigated) were found, given the current state of the project.

192

Bulk viscosity effects on elliptic flow  

E-Print Network (OSTI)

The effects of bulk viscosity on the elliptic flow $v_{2}$ are studied using realistic equation of state and realistic transport coefficients. We find that thebulk viscosity acts in a non trivial manner on $v_{2}$. At low $p_{T}$, the reduction of $v_{2}$ is even more effective compared to the case of shear viscosity, whereas at high $p_{T}$, an enhancement of $v_{2}$ compared to the ideal case is observed. We argue that this is caused by the competition of the critical behavior of the equation of state and the transport coefficients.

G. S. Denicol; T. Kodama; T. Koide; Ph. Mota

2009-07-24T23:59:59.000Z

193

A New Approach to Cosmological Bulk Viscosity  

E-Print Network (OSTI)

We examine the cosmological consequences of an alternative to the standard expression for bulk viscosity, one which was proposed to avoid the propagation of superluminal signals without the necessity of extending the space of variables of the theory. The Friedmann equation is derived for this case, along with an expression for the effective pressure. We find solutions for the evolution of the density of a viscous component, which differs markedly from the case of conventional Eckart theory; our model evolves toward late-time phantom-like behavior with a future singularity. Entropy production is addressed, and some similarities and differences to approaches based on the Mueller-Israel-Stewart theory are discussed.

Disconzi, Marcelo M; Scherrer, Robert J

2014-01-01T23:59:59.000Z

194

Magnetic structures of hcp bulk gadolinium  

Science Journals Connector (OSTI)

We present results of self-consistent linear-muffin-tin-orbital calculations with the atomic-sphere approximation for hcp bulk Gd, using the local spin-density approximation (LSDA) and gradient correction (GC) for the description of exchange and correlation. In the LSDA calculation antiferromagnetic order is favored over the ferromagnetic, and experimentally observed, structure. The GC weakens the bonding, leading to a higher equilibrium lattice parameter. At the new equilibrium volume the ground state is ferromagnetic. Our results point towards a magnetic phase transition under pressure.

Martina Heinemann and Walter M. Temmerman

1994-02-01T23:59:59.000Z

195

The Bulk Channel in Thermal Gauge Theories  

E-Print Network (OSTI)

We investigate the thermal correlator of the trace of the energy-momentum tensor in the SU(3) Yang-Mills theory. Our goal is to constrain the spectral function in that channel, whose low-frequency part determines the bulk viscosity. We focus on the thermal modification of the spectral function, $\\rho(\\omega,T)-\\rho(\\omega,0)$. Using the operator-product expansion we give the high-frequency behavior of this difference in terms of thermodynamic potentials. We take into account the presence of an exact delta function located at the origin, which had been missed in previous analyses. We then combine the bulk sum rule and a Monte-Carlo evaluation of the Euclidean correlator to determine the intervals of frequency where the spectral density is enhanced or depleted by thermal effects. We find evidence that the thermal spectral density is non-zero for frequencies below the scalar glueball mass $m$ and is significantly depleted for $m\\lesssim\\omega\\lesssim 3m$.

Harvey B. Meyer

2010-02-17T23:59:59.000Z

196

Hybrid Solar Cells with Prescribed Nanoscale Morphologies Based on Hyperbranched Semiconductor Nanocrystals  

E-Print Network (OSTI)

bulk heterojunction photovoltaic cells. Mrs Bulletin 30, 37-A. J. Polymer Photovoltaic Cells - Enhanced Efficiencies ViaC[sub 60] heterojunction photovoltaic cell. Applied Physics

Gur, Ilan; Fromer, Neil A.; Chen, Chih-Ping; Kanaras, Antonios G.; Alivisatos, A. Paul

2006-01-01T23:59:59.000Z

197

Photovoltaic devices based on high density boron-doped single-walled carbon nanotube/n-Si heterojunctions  

A simple and easily processible photovoltaic device has been developed based on borondoped single-walled carbon nanotubes (B-SWNTs) and n-type silicon (n-Si) heterojunctions. The single-walled carbon nanotubes (SWNTs) were substitutionally doped with boron atoms by thermal annealing, in the presence of B2O3. The samples used for these studies were characterized by Raman spectroscopy, thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), and x-ray photoelectron spectroscopy (XPS). The fully functional solar cell devices were fabricated by airbrush deposition that generated uniform B-SWNT films on top of the n-Si substrates. The carbon nanotube films acted as exciton-generation sites, charge collection and transportation, while the heterojunctions formed between B-SWNTs and n-Si acted as charge dissociation centers. The current-voltage characteristics in the absence of light and under illumination, as well as optical transmittance spectrum are reported here. It should be noted that the device fabrication process can be made amenable to scalability by depositing direct and uniform films using airbrushing, inkjet printing, or spin-coating techniques.

Saini, Viney [Univ. of Arkansas, Little Rock, AR (United States); Li, Zhongrui [Univ. of Arkansas, Little Rock, AR (United States); Bourdo, Shawn [Univ. of Arkansas, Little Rock, AR (United States); Kunets, Vasyl P. [Univ. of Arkansas, Fayetteville, AR (United States); Trigwell, Steven [ASRC Aerospace Corp., Kennedy Space Center, FL (United States); Couraud, Arthur [Univ. of Arkansas, Little Rock, AR (United States) and Ecole d'Ingenieurs de CESI-EIA, La Couronne (France); Rioux, Julien [Univ. of Arkansas, Little Rock, AR (United States) and Ecole d'Ingenieurs du CESI-EIA, La Couronne (France); Boyer, Cyril [Univ. of Arkansas, Little Rock, AR (United States) and Ecole d'Ingenieurs du CESI-EIA, La Couronne (France); Nteziyaremye, Valens [Univ. of Arkansas, Little Rock, AR (United States); Dervishi, Enkeleda [Univ. of Arkansas, Little Rock, AR (United States); Biris, Alexandru R. [National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca (Romania); Salamo, Gregory J. [Univ. of Arkansas, Fayetteville, AR (United States); Viswanathan, Tito [Univ. of Arkansas, Little Rock, AR (United States); Biris, Alexandru S. [Univ. of Arkansas, Little Rock, AR (United States)

2011-01-13T23:59:59.000Z

198

CuIn1-xGaxS2 thin film solar cells with ZnxCd1-xS as heterojunction partner Bhaskar Kumar  

E-Print Network (OSTI)

CuIn1-xGaxS2 thin film solar cells with ZnxCd1-xS as heterojunction partner Bhaskar Kumar 1 , Parag). i:ZnO/Al:ZnO transparent and conducting window bilayer was deposited by RF magnetron sputtering

Sites, James R.

199

On bulk viscosity and moduli decay  

E-Print Network (OSTI)

This pedagogically intended lecture, one of four under the header "Basics of thermal QCD", reviews an interesting relationship, originally pointed out by Bodeker, that exists between the bulk viscosity of Yang-Mills theory (of possible relevance to the hydrodynamics of heavy ion collision experiments) and the decay rate of scalar fields coupled very weakly to a heat bath (appearing in some particle physics inspired cosmological scenarios). This topic serves, furthermore, as a platform on which a number of generic thermal field theory concepts are illustrated. The other three lectures (on the QCD equation of state and the rates of elastic as well as inelastic processes experienced by heavy quarks) are recapitulated in brief encyclopedic form.

M. Laine

2010-07-15T23:59:59.000Z

200

Electron transport in the bulk photovoltaic effect  

Science Journals Connector (OSTI)

The spontaneous motion of electrons in the bulk photovoltaic effect in pyroelectric materials may be explained by separating the processes into two steps: the generation of photoelectrons whose distribution is asymmetric in momentum and a subsequent normal diffusion of the carriers. Asymmetric generation violates time-reversal symmetry and is shown to be only possible for local states in polar systems. Transport properties are calculated for the short-circuit and the open-end case. It is shown that in high-resistivity materials the short-circuit current is not affected by impurities other than those supplying the asymmetric photoelectrons. The open-end saturation field is proportional to the short-circuit current Es=Jsc?, where ? is the photoconductivity. Both results agree with experiment.

H. Heyszenau

1978-08-15T23:59:59.000Z

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201

DEPLOYMENT OF THE BULK TRITIUM SHIPPING PACKAGE  

SciTech Connect

A new Bulk Tritium Shipping Package (BTSP) was designed by the Savannah River National Laboratory to be a replacement for a package that has been used to ship tritium in a variety of content configurations and forms since the early 1970s. The BTSP was certified by the National Nuclear Safety Administration in 2011 for shipments of up to 150 grams of Tritium. Thirty packages were procured and are being delivered to various DOE sites for operational use. This paper summarizes the design features of the BTSP, as well as associated engineered material improvements. Fabrication challenges encountered during production are discussed as well as fielding requirements. Current approved tritium content forms (gas and tritium hydrides), are reviewed, as well as, a new content, tritium contaminated water on molecular sieves. Issues associated with gas generation will also be discussed.

Blanton, P.

2013-10-10T23:59:59.000Z

202

Hetero-junctions of Boron Nitride and Carbon Nanotubes: Synthesis and Characterization  

SciTech Connect

Hetero-junctions of boron nitride nanotubes (BNNTs) and carbon nanotubes (CNTs) are expected to have appealing new properties that are not available from pure BNNTs and CNTs. Theoretical studies indicate that BNNT/CNT junctions could be multifunctional and applicable as memory, spintronic, electronic, and photonics devices with tunable band structures. This will lead to energy and material efficient multifunctional devices that will be beneficial to the society. However, experimental realization of BNNT/CNT junctions was hindered by the absent of a common growth technique for BNNTs and CNTs. In fact, the synthesis of BNNTs was very challenging and may involve high temperatures (up to 3000 degree Celsius by laser ablation) and explosive chemicals. During the award period, we have successfully developed a simple chemical vapor deposition (CVD) technique to grow BNNTs at 1100-1200 degree Celsius without using dangerous chemicals. A series of common catalyst have then been identified for the synthesis of BNNTs and CNTs. Both of these breakthroughs have led to our preliminary success in growing two types of BNNT/CNT junctions and two additional new nanostructures: 1) branching BNNT/CNT junctions and 2) co-axial BNNT/CNT junctions, 3) quantum dots functionalized BNNTs (QDs-BNNTs), 4) BNNT/graphene junctions. We have started to understand their structural, compositional, and electronic properties. Latest results indicate that the branching BNNT/CNT junctions and QDs-BNNTs are functional as room-temperature tunneling devices. We have submitted the application of a renewal grant to continue the study of these new energy efficient materials. Finally, this project has also strengthened our collaborations with multiple Department of Energy�s Nanoscale Science Research Centers (NSRCs), including the Center for Nanophase Materials Sciences (CNMS) at Oak Ridge National Laboratory, and the Center for Integrated Nanotechnologies (CINTs) at Sandia National Laboratories and Los Alamos National Laboratory. Results obtained during the current funding period have led to the publication of twelve peer reviewed articles, three review papers, two book and one encyclopedia chapters, and thirty eight conference/seminar presentation. One US provisional patent and one international patent have also been filed.

Yap, Yoke Khin

2013-03-14T23:59:59.000Z

203

RAPID/BulkTransmission/General Construction | Open Energy Information  

Open Energy Info (EERE)

RAPIDBulkTransmissionGeneral Construction < RAPID | BulkTransmission Jump to: navigation, search RAPID Regulatory and Permitting Information Desktop Toolkit BETA RAPID Toolkit...

204

On Eling-Oz formula for the holographic bulk viscosity  

E-Print Network (OSTI)

Recently Eling and Oz [1] proposed a simple formula for the bulk viscosity of holographic plasma. They argued that the formula is valid in the high temperature (near-conformal) regime, but is expected to break down at low temperatures. We point out that the formula is in perfect agreement with the previous computations of the bulk viscosity of the cascading plasma [2,3], as well as with the previous computations of the bulk viscosity of N=2^* plasma [4,5]. In the latter case it correctly reproduces the critical behaviour of the bulk viscosity in the vicinity of the critical point with the vanishing speed of sound.

Alex Buchel

2011-03-19T23:59:59.000Z

205

Bulk viscosity of QCD matter near the critical temperature  

E-Print Network (OSTI)

Kubo's formula relates bulk viscosity to the retarded Green's function of the trace of the energy-momentum tensor. Using low energy theorems of QCD for the latter we derive the formula which relates the bulk viscosity to the energy density and pressure of hot matter. We then employ the available lattice QCD data to extract the bulk viscosity as a function of temperature. We find that close to the deconfinement temperature bulk viscosity becomes large, with viscosity-to-entropy ratio zeta/s about 1.

D. Kharzeev; K. Tuchin

2007-05-29T23:59:59.000Z

206

Regulatory Roadmap Workshop for Federal Bulk Transmission Regulations...  

Open Energy Info (EERE)

Regulatory Roadmapping Pgower's picture Submitted by Pgower(45) Member 7 August, 2014 - 13:19 One-day workshop to review regulatory roadmaps for bulk transmission. Date:...

207

RAPID/BulkTransmission/Arizona | Open Energy Information  

Open Energy Info (EERE)

Entity responsible for coordinating and promoting Bulk Electric System reliability in the Western Interconnection, including Arizona. WECC also provides an environment for...

208

Light-Emitting Diodes on Semipolar Bulk Gallium Nitride Substrate  

Energy.gov (U.S. Department of Energy (DOE))

This project is producing high-efficiency semipolar light-emitting diodes (LEDs) on low-defect bulk gallium nitride (GaN) substrates.

209

RAPID/BulkTransmission/New Mexico | Open Energy Information  

Open Energy Info (EERE)

Information Desktop Toolkit BETA RAPID Toolkit About Bulk Transmission Geothermal Solar Resources Contribute Contact Us Regulatory Information Overviews Search for other...

210

Bulk Fuel Procurement Process & Alternative Drop-in Fuel  

Energy.gov (U.S. Department of Energy (DOE))

Jeanne Binder, DLA Energy, presentation on Bulk Fuel Procurement Process & Alternative Drop-in Fuel at the Advanced Biofuels Industry Roundtable.

211

Strategies for High Thermoelectric zT in Bulk Materials  

Energy.gov (U.S. Department of Energy (DOE))

Zintl principle in chemistry, complex electronic band structures, and incorporation of nanometer sized particles were used to explore, optimize and improve bulk thermoelectric materials

212

Recent Device Developments with Advanced Bulk Thermoelectric Materials at RTI  

Energy.gov (U.S. Department of Energy (DOE))

Reviews work in engineered thin-film nanoscale thermoelectric materials and nano-bulk materials with high ZT undertaken by RTI in collaboration with its research partners

213

High Heat Flux Thermoelectric Module Using Standard Bulk Material  

Energy.gov (U.S. Department of Energy (DOE))

Presents high heat flux thermoelectric module design for cooling using a novel V-shaped shunt configuration with bulk TE elements achieving high area packing fractions

214

Control Center and Data Management Improvements Modernize Bulk...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Operations Corporation's (GSOC) Smart Grid Investment Grant (SGIG) project modernized bulk power management and control center operations for 38 electric membership...

215

RAPID/BulkTransmission/Air Quality | Open Energy Information  

Open Energy Info (EERE)

RAPIDBulkTransmissionAir Quality < RAPID | BulkTransmission Jump to: navigation, search RAPID Regulatory and Permitting Information Desktop Toolkit BETA RAPID Toolkit About...

216

Nanostructured High-Temperature Bulk Thermoelectric Energy Conversion...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

High Temperature Bulk Thermoelectric Energy Conversion for Efficient Waste Heat Recovery Project Overview 2 * Start: October 2011 * End: September 2015 * Percent complete -...

217

RAPID/BulkTransmission/About | Open Energy Information  

Open Energy Info (EERE)

Contribute Contact Us About Bulk Transmission Lattice.jpg High-voltage transmission lines form the backbone of electricity systems. Transmission lines are designed to carry...

218

RAPID/BulkTransmission/Water Quality | Open Energy Information  

Open Energy Info (EERE)

RAPIDBulkTransmissionWater Quality < RAPID | BulkTransmission Jump to: navigation, search RAPID Regulatory and Permitting Information Desktop Toolkit BETA RAPID Toolkit About...

219

Improving Bulk Microphysics Parameterizations in Simulations of Aerosol Effects  

SciTech Connect

To improve the microphysical parameterizations for simulations of the aerosol indirect effect (AIE) in regional and global climate models, a double-moment bulk microphysical scheme presently implemented in the Weather Research and Forecasting (WRF) model is modified and the results are compared against atmospheric observations and simulations produced by a spectral bin microphysical scheme (SBM). Rather than using prescribed aerosols as in the original bulk scheme (Bulk-OR), a prognostic doublemoment aerosol representation is introduced to predict both the aerosol number concentration and mass mixing ratio (Bulk-2M). The impacts of the parameterizations of diffusional growth and autoconversion and the selection of the embryonic raindrop radius on the performance of the bulk microphysical scheme are also evaluated. Sensitivity modeling experiments are performed for two distinct cloud regimes, maritime warm stratocumulus clouds (SC) over southeast Pacific Ocean from the VOCALS project and continental deep convective clouds (DCC) in the southeast of China from the Department of Energy/ARM Mobile Facility (DOE/AMF) - China field campaign. The results from Bulk-2M exhibit a much better agreement in the cloud number concentration and effective droplet radius in both the SC and DCC cases with those from SBM and field measurements than those from Bulk-OR. In the SC case particularly, Bulk-2M reproduces the observed drizzle precipitation, which is largely inhibited in Bulk-OR. Bulk-2M predicts enhanced precipitation and invigorated convection with increased aerosol loading in the DCC case, consistent with the SBM simulation, while Bulk-OR predicts the opposite behaviors. Sensitivity experiments using four different types of autoconversion schemes reveal that the autoconversion parameterization is crucial in determining the raindrop number, mass concentration, and drizzle formation for warm 2 stratocumulus clouds. An embryonic raindrop size of 40 ?m is determined as a more realistic setting in the autoconversion parameterization. The saturation adjustment employed in calculating condensation/evaporation in the bulk scheme is identified as the main factor responsible for the large discrepancies in predicting cloud water in the SC case, suggesting that an explicit calculation of diffusion growth with predicted supersaturation is necessary for further improvements of the bulk microphysics scheme. Lastly, a larger rain evaporation rate below cloud is found in the bulk scheme in comparison to the SBM simulation, which could contribute to a lower surface precipitation in the bulk scheme.

Wang, Yuan; Fan, Jiwen; Zhang, Renyi; Leung, Lai-Yung R.; Franklin, Charmaine N.

2013-06-05T23:59:59.000Z

220

Interfacial chemical bonding state and band alignment of CaF{sub 2}/hydrogen-terminated diamond heterojunction  

SciTech Connect

CaF{sub 2} films are deposited on hydrogen-terminated diamond (H-diamond) by a radio-frequency sputter-deposition technique at room temperature. Interfacial chemical bonding state and band alignment of CaF{sub 2}/H-diamond heterojunction are investigated by X-ray photoelectron spectroscopy. It is confirmed that there are only C-Ca bonds at the CaF{sub 2}/H-diamond heterointerface. Valence and conductance band offsets of the CaF{sub 2}/H-diamond heterojunciton are determined to be 3.7 {+-} 0.2 and 0.3 {+-} 0.2 eV, respectively. It shows a type I straddling band configuration. The large valence band offset suggests advantage of the CaF{sub 2}/H-diamond heterojunciton for the development of high power and high frequency field effect transistors.

Liu, J. W.; Liao, M. Y.; Cheng, S. H.; Imura, M. [Optical and Electronic Materials Unit, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Koide, Y. [Optical and Electronic Materials Unit, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan); Nanofabrication Platform, NIMS, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan); Center of Materials Research for Low Carbon Emission (CMRLC), NIMS, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)

2013-03-28T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Photon-number squeezing by the nonlinear backward pump process in a constant-voltage heterojunction LED  

Science Journals Connector (OSTI)

We investigated extensively the sub-Poissonian-photon-state generation by the microscopic backward-pump (BP) process in a semiconductor heterojunction light-emitting diode (LED) under constant-voltage operation. In particular, the BP rate relative to the forward pump rate has been carefully evaluated from the dc characteristics of the LED and shown to depend strongly on the injection current and the device temperature. We then compare the experimental results of the photon-number squeezing performed at various temperatures in the constant-voltage-drive setup with the theoretical prediction estimated numerically using the parameter values determined from the dc measurements. As a consequence, it was proven that the observed squeezing at room temperature is successfully interpreted only in terms of the nonlinear BP model, while that at low temperature (?100?K) is explained simply by the conventional model based on macroscopic Coulomb-blockade effect for the pump-noise suppression.

Hiroyuki Sumitomo; Masamichi Yamanishi; Yutaka Kadoya

2002-04-10T23:59:59.000Z

222

Rectification properties of n-type nanocrystalline diamond heterojunctions to p-type silicon carbide at high temperatures  

SciTech Connect

Highly rectifying heterojunctions of n-type nanocrystalline diamond (NCD) films to p-type 4H-SiC substrates are fabricated to develop p-n junction diodes operable at high temperatures. In reverse bias condition, a potential barrier for holes at the interface prevents the injection of reverse leakage current from the NCD into the SiC and achieves the high rectification ratios of the order of 10{sup 7} at room temperature and 10{sup 4} even at 570?K. The mechanism of the forward current injection is described with the upward shift of the defect energy levels in the NCD to the conduction band of the SiC by forward biasing. The forward current shows different behavior from typical SiC Schottky diodes at high temperatures.

Goto, Masaki; Amano, Ryo; Shimoda, Naotaka [Graduate School of Automotive Science, Kyushu University, Nishiku, Fukuoka 819-0395 (Japan); Kato, Yoshimine, E-mail: yoshimine.kato@zaiko.kyushu-u.ac.jp [Department of Materials Science and Engineering, Kyushu University, Nishiku, Fukuoka 819-0395 (Japan); Teii, Kungen [Department of Applied Science for Electronics and Materials, Kyushu University, Kasuga, Fukuoka 816-8580 (Japan)

2014-04-14T23:59:59.000Z

223

Self-powered solid-state photodetector based on TiO{sub 2} nanorod/spiro-MeOTAD heterojunction  

SciTech Connect

A nanostructured solid-state photodetector based on an inorganic/organic semiconductor heterojunction of TiO{sub 2} nanorod/spiro-MeOTAD is constructed. Spiro-MeOTAD serves as the active absorption layer and TiO{sub 2} offers a direct pathway for electron transport. A maximum photoresponsivity of 0.01?A/W was observed under illumination of 410?nm at 0?V bias. The time response (decay time is 0.06?s and rise time is 0.12?s) was observed to be rapid. The self-powered device is a promising candidate for application in high-sensitivity and high-speed blue light photodetectors. These results provided a simple way to fabricate low-cost, high spectrum selectivity hybrid photodetector with large area.

Xie, Yanru; Li, Qinghao; Wei, Guodong; Wang, Dong; Chen, Yanxue, E-mail: cyx@sdu.edu.cn; Yan, Shishen; Liu, Guolei; Mei, Liangmo [School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 (China)] [School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 (China); Wei, Lin [School of Information Science and Engineering, Shandong University, Jinan 250100 (China)] [School of Information Science and Engineering, Shandong University, Jinan 250100 (China); Jiao, Jun [Department of Mechanical and Materials Engineering, Portland State University, P.O. Box 751, Portland, Oregon 97207-0751 (United States)] [Department of Mechanical and Materials Engineering, Portland State University, P.O. Box 751, Portland, Oregon 97207-0751 (United States)

2013-12-23T23:59:59.000Z

224

Leptonic contribution to the bulk viscosity of nuclear matter  

SciTech Connect

For {beta}-equilibrated nuclear matter we estimate the contribution to the bulk viscosity from purely leptonic processes, namely the conversion of electrons to and from muons. For oscillation frequencies in the kilohertz range, we find that this process provides the dominant contribution to the bulk viscosity when the temperature is well below the critical temperature for superconductivity or superfluidity of the nuclear matter.

Alford, Mark G.; Good, Gerald [Physics Department, Washington University, St. Louis, Missouri 63130 (United States)

2010-11-15T23:59:59.000Z

225

BULK TITANIUM MICROFLUIDIC NETWORKS FOR PROTEIN SELF-ASSEMBLY STUDIES  

E-Print Network (OSTI)

BULK TITANIUM MICROFLUIDIC NETWORKS FOR PROTEIN SELF-ASSEMBLY STUDIES E.R. Parker1 , L.S. Hirst2 developed micromachining technique to fabricate microfluidic networks in thin titanium foils. These devices relevant conditions. Keywords: bulk titanium, cytoskeleton proteins, microfluidics, surface modification 1

MacDonald, Noel C.

226

Bulk Hydrogen Storage - Strategic Directions for Hydrogen Delivery Workshop  

NLE Websites -- All DOE Office Websites (Extended Search)

Hydrogen Hydrogen Storage Strategic Directions for Hydrogen Delivery Workshop May 7-8, 2003 Crystal City, Virginia Breakout Session - Bulk Hydrogen Storage Main Themes/Caveats Bulk Storage = Anything not on the vehicle 10's of Tons -- End use point 50-100 Tons - Terminals/City Gates 1000's Tons - Between Production Facility and Terminal/City Gate Bulk storage requirements less restrictive and different from on-board storage Uncertainty about evolution of infrastructure requires multiple pathways to be considered Bulk storage is an economic solution to address supply/demand imbalance Breakout Session - Bulk Hydrogen Storage Targets/Objectives Hard to quantify - scenario & end-use dependent Storage Materials (solid state) and container require different targets

227

Carbon nanotubes grown on bulk materials and methods for fabrication  

DOE Patents (OSTI)

Disclosed are structures formed as bulk support media having carbon nanotubes formed therewith. The bulk support media may comprise fibers or particles and the fibers or particles may be formed from such materials as quartz, carbon, or activated carbon. Metal catalyst species are formed adjacent the surfaces of the bulk support material, and carbon nanotubes are grown adjacent the surfaces of the metal catalyst species. Methods employ metal salt solutions that may comprise iron salts such as iron chloride, aluminum salts such as aluminum chloride, or nickel salts such as nickel chloride. Carbon nanotubes may be separated from the carbon-based bulk support media and the metal catalyst species by using concentrated acids to oxidize the carbon-based bulk support media and the metal catalyst species.

Menchhofer, Paul A. (Clinton, TN); Montgomery, Frederick C. (Oak Ridge, TN); Baker, Frederick S. (Oak Ridge, TN)

2011-11-08T23:59:59.000Z

228

Silicon bulk micromachined hybrid dimensional artifact.  

SciTech Connect

A mesoscale dimensional artifact based on silicon bulk micromachining fabrication has been developed and manufactured with the intention of evaluating the artifact both on a high precision coordinate measuring machine (CMM) and video-probe based measuring systems. This hybrid artifact has features that can be located by both a touch probe and a video probe system with a k=2 uncertainty of 0.4 {micro}m, more than twice as good as a glass reference artifact. We also present evidence that this uncertainty could be lowered to as little as 50 nm (k=2). While video-probe based systems are commonly used to inspect mesoscale mechanical components, a video-probe system's certified accuracy is generally much worse than its repeatability. To solve this problem, an artifact has been developed which can be calibrated using a commercially available high-accuracy tactile system and then be used to calibrate typical production vision-based measurement systems. This allows for error mapping to a higher degree of accuracy than is possible with a glass reference artifact. Details of the designed features and manufacturing process of the hybrid dimensional artifact are given and a comparison of the designed features to the measured features of the manufactured artifact is presented and discussed. Measurement results from vision and touch probe systems are compared and evaluated to determine the capability of the manufactured artifact to serve as a calibration tool for video-probe systems. An uncertainty analysis for calibration of the artifact using a CMM is presented.

Claudet, Andre A.; Tran, Hy D.; Bauer, Todd Marks; Shilling, Katherine Meghan; Oliver, Andrew David

2010-03-01T23:59:59.000Z

229

Theoretical investigation of direct and phonon-assisted tunneling currents in InAlGaAs/InGaAs bulk and quantum-well interband tunnel junctions for multijunction solar cells  

Science Journals Connector (OSTI)

Direct and phonon-assisted tunneling currents in InAlGaAs-InGaAs bulk and double-quantum-well interband tunnel heterojunctions are simulated rigorously using the nonequilibrium Green's function formalism for coherent and dissipative quantum transport in combination with a simple two-band tight-binding model for the electronic structure. A realistic band profile and the associated built-in electrostatic field are obtained via self-consistent coupling of the transport formalism to Poisson's equation. The model reproduces experimentally observed features in the current-voltage characteristics of the devices, such as the pronounced current enhancement in the quantum-well junction as compared to the bulk junction and the structure appearing in the negative-differential resistance regime due to quantization of emitter states. Local maps of density of states and the current spectrum reveal the impact of quasibound states, electric fields, and electron-phonon scattering on the interband tunneling current. In this way, resonances appearing in the current through the double-quantum-well structure in the negative-differential resistance regime can be related to the alignment of subbands in the coupled quantum wells.

U. Aeberhard

2013-02-05T23:59:59.000Z

230

Determining band offsets using surface photovoltage spectroscopy: The InP/In0.53Ga0.47As heterojunction  

E-Print Network (OSTI)

applied to the In2O3 /InP4 and CdS/Cu In,Ga Se2 5 heterojunctions. However, it requires an accurate the top layer doping is sufficiently low. The technique is based on surface photovoltage spectroscopy consisted of 1 m thick n-type Si-doped 1017 cm 3 In0.53Ga0.47As layers grown by metalorganic vapor phase

Shapira, Yoram

231

Bulk viscosity, chemical equilibration and flow at RHIC  

E-Print Network (OSTI)

We study the effects of bulk viscosity on p_T spectra and elliptic flow in heavy ion collisions at RHIC. We argue that direct effect of the bulk viscosity on the evolution of the velocity field is small, but corrections to the freezeout distributions can be significant. These effects are dominated by chemical non-equilibration in the hadronic phase. We show that a non-zero bulk viscosity in the range $\\zeta/s \\lsim 0.05$ improves the description of spectra and flow at RHIC.

Thomas Schaefer; Kevin Dusling

2012-10-15T23:59:59.000Z

232

Brane-Bulk energy exchange and agegraphic dark energy  

E-Print Network (OSTI)

We consider the agegraphic models of dark energy in a braneworld scenario with brane-bulk energy exchange. We assume that the adiabatic equation for the dark matter is satisfied while it is violated for the agegraphic dark energy due to the energy exchange between the brane and the bulk. Our study shows that with the brane-bulk interaction, the equation of state parameter of agegraphic dark energy on the brane, $w_D$, can have a transition from normal state where $w_D >-1 $ to the phantom regime where $w_D energy always satisfies $w^{\\mathrm{eff}}_D\\geq-1$.

Ahmad Sheykhi

2010-02-06T23:59:59.000Z

233

ARM - Campaign Instrument - ec-convair580-bulk  

NLE Websites -- All DOE Office Websites (Extended Search)

govInstrumentsec-convair580-bulk govInstrumentsec-convair580-bulk Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign Instrument : Environment Canada Convair 580 Bulk Parameters (EC-CONVAIR580-BULK) Instrument Categories Aerosols, Cloud Properties, Airborne Observations Campaigns Indirect and Semi-Direct Aerosol Campaign (ISDAC) [ Download Data ] North Slope Alaska, 2008.04.01 - 2008.04.30 Primary Measurements Taken The following measurements are those considered scientifically relevant. Refer to the datastream (netcdf) file headers for the list of all available measurements, including those recorded for diagnostic or quality assurance purposes. Ice water content Liquid water content Hydrometeor size Cloud particle number concentration Aerosol concentration

234

Bulk Energy Storage Webinar Rescheduled for February 9, 2012 | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Bulk Energy Storage Webinar Rescheduled for February 9, 2012 Bulk Energy Storage Webinar Rescheduled for February 9, 2012 Bulk Energy Storage Webinar Rescheduled for February 9, 2012 February 1, 2012 - 12:48pm Addthis The U.S. Department of Energy (DOE) and the Iowa Stored Energy Park (ISEP) are conducting a free, 1-hour webinar, Lessons from Iowa: The Economic, Market, and Organizational Issues in Making Bulk Energy Storage Work, on Thursday, February 9, 2012 at 1 p.m. ET. Presenters include Dr. Imre Gyuk of DOE's Office of Electricity Deliverability and Energy Reliability and Bob Schulte from ISEP. The webinar was original scheduled for January 20, 2012, but experienced technical difficulties due to the large number of participants and was rescheduled. All participants must reregister. Funded by a DOE grant and managed by Sandia National Laboratories, ISEP's

235

Design of Bulk Nanocomposites as High Efficiency Thermoelectric Materials |  

Office of Science (SC) Website

Design of Bulk Nanocomposites as High Design of Bulk Nanocomposites as High Efficiency Thermoelectric Materials Energy Frontier Research Centers (EFRCs) EFRCs Home Centers Research Science Highlights Highlight Archives News & Events Publications Contact BES Home 04.27.12 Design of Bulk Nanocomposites as High Efficiency Thermoelectric Materials Print Text Size: A A A RSS Feeds FeedbackShare Page Scientific Achievement A newly synthesized bulk thermoelectric material that contains nanocrystals with the same orientation and structure as the host material breaks thermoelectric efficiency records by blocking thermal, but not electrical, conductivity. Significance and Impact A new strategy to design inexpensive materials that more efficiently convert heat to electricity. Research Details Thermoelectric materials directly generate electrical power from heat, but

236

Producing bulk residual stresses in gas turbine blades  

Science Journals Connector (OSTI)

Inhomogeneous plastic strain has been used to produce a pattern of bulk compressive stresses that counteract macrodefect formation and growth in machine components, which increases the working life. Studies ha...

V. A. Boguslaev; A. P. Lopatenko; N. B. Makarenko; N. I. Obodan

1993-02-01T23:59:59.000Z

237

Bulk viscosity of anisotropically expanding hot QCD plasma  

SciTech Connect

The bulk viscosity, {zeta} and its ratio with the shear viscosity, {zeta}/{eta} have been studied in an anisotropically expanding pure glue plasma in the presence of turbulent color fields. It has been shown that the anisotropy in the momentum distribution function of gluons, which has been determined from a linearized transport equation eventually leads to the bulk viscosity. For the isotropic (equilibrium) state, a recently proposed quasiparticle model of pure SU(3) lattice QCD equation of state has been employed where the interactions are encoded in the effective fugacity. It has been argued that the interactions present in the equation of state, significantly contribute to the bulk viscosity. Its ratio with the shear viscosity is significant even at 1.5T{sub c}. Thus, one needs to take in account the effects of the bulk viscosity while studying the hydrodynamic expansion of quark-gluon plasma in the Relativistic Heavy Ion Collider and the Large Hadron Collider.

Chandra, Vinod [Department of Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai-400005 (India)

2011-11-01T23:59:59.000Z

238

Bulk viscosity in nuclear and quark matter: A short review  

E-Print Network (OSTI)

The history and recent progresses in the study of bulk viscosity in nuclear and quark matter are reviewed. The constraints from baryon number conservation and electric neutrality in quark matter on particle densities and fluid velocity divergences are discussed.

Hui Dong; Nan Su; Qun Wang

2007-02-07T23:59:59.000Z

239

Solar Heating Test Design Facility for Bulk PCM Storage  

Science Journals Connector (OSTI)

This experimentation, conducted by the “Centre d’Energétique de l’ENSMP”, was designed to analyze the interest of bulk PCM storage centralized in a real water active solar heating system consisting of a low tempe...

P. Achard; B. Amann; D. Mayer

1984-01-01T23:59:59.000Z

240

Stresses resulting from compression of bulk cotton lint fibers  

E-Print Network (OSTI)

The modulus of elasticity, Poisson's ratio and shear modulus of bulk cotton lint fibers were determined. The cotton lint was compressed in an MTS machine to a predetermined density, and the resilient forces induced by the cotton lint after being...

Chimbombi, Ezekiel Maswe

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

A bulk-flow model of angled injection Lomakin bearings  

E-Print Network (OSTI)

A bulk-flow model for determination of the leakage and dynamic force characteristics of angled injection Lomakin bearings is presented. Zeroth- and first-order equations describe the equilibrium flow for a centered bearing and the perturbed flow...

Soulas, Thomas Antoine Theo

2001-01-01T23:59:59.000Z

242

Photonic integration in a commercial scaled bulk-CMOS process  

E-Print Network (OSTI)

We demonstrate the first photonic chip designed for a commercial bulk CMOS process (65 nm-node) using standard process layers combined with post-processing, enabling dense photonic integration with high-performance ...

Kaertner, Franz X.

243

Proposal of a Bulk HTSC Staggered Array Undulator  

SciTech Connect

We proposed a new type of undulator based on bulk high-T{sub c} superconductors (HTSC) which consists of a single solenoid and a stacked array of bulk HTSC. The main advantage of this configuration is that a mechanical structure is not required to produce and control the undulator field. In order to perform a proof of principle experiment, we have developed a prototype of bulk HTSC staggered array undulator using 11 pairs of DyBaCuO bulk superconductors and a normal conducting solenoid. Experimental results obtained by using the prototype undulator and numerical results obtained by a loop current model based on the Bean mode for a type-II superconductor were compared.

Kii, Toshiteru; Kinjo, Ryota; Bakr, Mahmoud A.; Sonobe, Taro; Higashimura, Keisuke; Masuda, Kai; Ohgaki, Hideaki; Yoshida, Kyohei [Institute of Advanced Energy, Kyoto University, Kyoto, 611-0011 (Japan); Zen, Heisyun [Institute for Molecular Science, National Institute of Natural Sciences, Aichi 444-8585 (Japan)

2010-06-23T23:59:59.000Z

244

CMI Unique Facility: Bulk Combinatoric Materials Synthesis Facility...  

NLE Websites -- All DOE Office Websites (Extended Search)

is in the form of a thin film. CMI researchers at The Ames Laboratory have adapted an additive manufacturing tool (sometimes known as a "3-D printer") to produce arrays of bulk...

245

Bulk viscosity and the conformal anomaly in the pion gas  

E-Print Network (OSTI)

We calculate the bulk viscosity of the massive pion gas within Unitarized Chiral Perturbation Theory. We obtain a low temperature peak arising from explicit conformal breaking due to the pion mass and another peak near the critical temperature, dominated by the conformal anomaly through gluon condensate terms. The correlation between bulk viscosity and conformal breaking supports a recent QCD proposal. We discuss the role of resonances, heavier states and large-$N_c$ counting.

D. Fernandez-Fraile; A. Gomez Nicola

2008-09-26T23:59:59.000Z

246

Costs, Savings and Financing Bulk Tanks on Texas Dairy Farms.  

E-Print Network (OSTI)

\\ BULLETIN 904 MAY 1958 .t(. :a ,s - / cwdh\\@ Costs, Savi~gs;.itd Financing Bulk Tanks on Texas Dairy Farms . ?. I I 1 i I I ! ,:ravings in hauling - 10 cents I \\ \\ 1 \\ savings in hauling - 15 cents -----------____--- 'savings... in hauling - 20 cents Annual production, 1,000 pounds Estimated number of years required for savings from a bulk tank to equal additional costs at different levels of production and savings in hauling costs. TEXAS AGRICULTURAL EXPERIMEN'T STATION R. D...

Moore, Donald S.; Stelly, Randall; Parker, Cecil A.

1958-01-01T23:59:59.000Z

247

Compositional ordering and stability in nanostructured, bulk thermoelectric alloys.  

SciTech Connect

Thermoelectric materials have many applications in the conversion of thermal energy to electrical power and in solid-state cooling. One route to improving thermoelectric energy conversion efficiency in bulk material is to embed nanoscale inclusions. This report summarize key results from a recently completed LDRD project exploring the science underpinning the formation and stability of nanostructures in bulk thermoelectric and the quantitative relationships between such structures and thermoelectric properties.

Hekmaty, Michelle A.; Faleev, S.; Medlin, Douglas L.; Leonard, F.; Lensch-Falk, J.; Sharma, Peter Anand; Sugar, J. D.

2009-09-01T23:59:59.000Z

248

Hydrogeologic investigation of petrochemical contamination at a bulk storage facility  

E-Print Network (OSTI)

in 1953 and began receiving petroleum products through a pipeline in 1954. Other industrial facilities which developed in the area include Duke City Distributing, a food distributor; the Texaco Refining and Marketing bulk terminal; General Electric... in 1953 and began receiving petroleum products through a pipeline in 1954. Other industrial facilities which developed in the area include Duke City Distributing, a food distributor; the Texaco Refining and Marketing bulk terminal; General Electric...

Fryar, Dennis Gene

2012-06-07T23:59:59.000Z

249

Finsler geometric perspective on the bulk flow in the universe  

E-Print Network (OSTI)

Astronomical observations showed that there may exist a bulk flow with peculiar velocities in the universe, which contradicts with the (\\Lambda)CDM model. The bulk flow reveals that the observational universe is anisotropic at large scales. In fact, a more reliable observation on the anisotropy of spacetime comes from the CMB power spectra. The WMAP and Planck satellites both show that there is a hemispherical power asymmetry at large-angular scales. In this paper, we propose a "wind" scenario to the bulk flow (or the anisotropy of spacetime). Under the influence of the "wind", the spacetime metric could become a Finsler structure. By resolving the null geodesic equation, we obtain the modified luminosity distance, which has a dipolar form at the leading order. Thus, the "wind" describes well the bulk flow. In addition, we perform a least-(\\chi^2) fit to the data of type Ia supernovae (SNe Ia) in the Union2.1 compilation. The peculiar velocity of the bulk flow has an upper limit (v_{bulk}\\lesssim 4000 \\rm{km/s}), which is compatible with all the existing observational values.

Zhe Chang; Ming-Hua Li; Sai Wang

2013-03-07T23:59:59.000Z

250

,"U.S. Refinery, Bulk Terminal, and Natural Gas Plant Stocks...  

U.S. Energy Information Administration (EIA) Indexed Site

Stocks at Refineries, Bulk Terminals, and Natural Gas Plants (Thousand Barrels)","U.S. Gasoline Blending Components Stocks at Refineries, Bulk Terminals, and Natural Gas Plants...

251

A Combined FTIR and TPD Study on the Bulk and Surface Dehydroxylation...  

NLE Websites -- All DOE Office Websites (Extended Search)

and TPD Study on the Bulk and Surface Dehydroxylation and Decarbonation of Synthetic Goethite. A Combined FTIR and TPD Study on the Bulk and Surface Dehydroxylation and...

252

The Role of Surface Chemistry and Bulk Properties on the Cycling...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

The Role of Surface Chemistry and Bulk Properties on the Cycling and Rate Capability of Lithium Positive Electrode Materials The Role of Surface Chemistry and Bulk Properties on...

253

Effect of Mg ionization efficiency on performance of Npn AlGaN/GaN heterojunction bipolar transistors  

SciTech Connect

A drift-diffusion transport model has been used to examine the performance capabilities of AlGaN/GaN Npn heterojunction bipolar transistors (HBTs). The Gummel plot from the first GaN-based HBT structure recently demonstrated is adjusted with simulation by using experimental mobility and lifetime reported in the literature. Numerical results have been explored to study the effect of the p-type Mg doping and its incomplete ionization in the base. The high base resistance induced by the deep acceptor level is found to be the cause of limiting current gain values. Increasing the operating temperature of the device activates more carriers in the base. An improvement of the simulated current gain by a factor of 2 to 4 between 25 and 300 C agrees well with the reported experimental results. A preliminary analysis of high frequency characteristics indicates substantial progress of predicted rf performances by operating the device at higher temperature due to a reduced extrinsic base resistivity.

MONIER,C.; PEARTON,S.J.; CHANG,PING-CHIH; BACA,ALBERT G.

2000-03-10T23:59:59.000Z

254

Simulation of Npn and Pnp AlGaN/GaN heterojunction bipolar transistors performances: Limiting factors and optimum design  

SciTech Connect

The performance capabilities of Npn and Pnp AlGaN/GaN heterojunction bipolar transistors have been investigated by using a drift-diffusion transport model. Numerical results have been employed to study the effect of the p-type Mg doping and its incomplete ionization on device performance. The high base resistance induced by the deep acceptor level is found to be the cause of limited current gain values for Npn devices. Several computation approaches have been considered to improve their performance. Reasonable improvement of the DC current gain {beta} is observed by realistically reducing the base thickness in accordance with processing limitations. Base transport enhancement is also predicted by the introduction of a quasi-electric field in the base. The impact of the base resistivity on high-frequency characteristics is investigated for Npn AlGaN/GaN devices. Optimized predictions with maximum oscillation frequency value as high as f{sub MAX} = 20 GHz and a unilateral power gain--U = 25 dB make this bipolar GaN-based technology compatible with communication applications. Simulation results reveal that the restricted amount of free carriers from the p-doped emitter limits Pnp's DC performances operating in common emitter configuration. A preliminary analysis of r.f. characteristics for the Pnp counterpart indicates limited performance mainly caused by the degraded hole mobility.

MONIER,C.; REN,F.; HAN,JUNG; CHANG,PING-CHIH; SHUL,RANDY J.; LEE,K.P.; ZHANG,A.P.; BACA,ALBERT G.; PEARTON,S.J.

2000-04-25T23:59:59.000Z

255

Twofold spin-triplet pairing states and tunneling conductance in ferromagnet/ferromagnet/iron pnictide superconductor heterojunctions  

SciTech Connect

By applying an extended eight-component Bogoliubov–de Gennes equation, we study theoretically the tunneling conductance in clean ferromagnet/ferromagnet/iron pnictide superconductor (FM/FM/iron-based SC) heterojunctions. Under the condition of noncollinear magnetizations, twofold novel Andreev reflections exist due to the existence of two bands in the SC, in which the incident electron and the two Andreev-reflected holes, belonging to the same spin subband, form twofold spin-triplet pairing states near the FM/iron-based SC interface. It is shown that the conversions of the conductance not only between the zero-bias peak and valley at zero energy but also between the peaks and dips at two gap energies are strongly dependent on both the interband coupling strength in the SC and the spin polarization in the FM. The qualitative differences from tunneling into a conventional s-wave SC are also presented, which may help with experimentally probing and identifying the antiphase s-wave pairing symmetry in the iron-based SC. -- Highlights: •An eight-component Bogoliubov–de Gennes (BDG) equation. •Twofold novel ARs and twofold usual ARs. •Conversions of conductance between the zero-bias peak and valley at zero energy. •Conversions of conductance between peaks and dips at two gap energies. •The importance of the interband coupling strength in the SC.

Yang, X. [Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023 (China)] [Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023 (China); Tao, Y.C., E-mail: yctao88@163.com [Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing 210023 (China); Dong, Z.C. [Department of Physics, Nantong University, Nantong 226001 (China)] [Department of Physics, Nantong University, Nantong 226001 (China); Hu, J.G. [Department of Physics, Yangzhou University, Yangzhou 225002 (China)] [Department of Physics, Yangzhou University, Yangzhou 225002 (China)

2013-06-15T23:59:59.000Z

256

Dark goo: bulk viscosity as an alternative to dark energy  

SciTech Connect

We present a simple (microscopic) model in which bulk viscosity plays a role in explaining the present acceleration of the universe. The effect of bulk viscosity on the Friedmann equations is to turn the pressure into an 'effective' pressure containing the bulk viscosity. For a sufficiently large bulk viscosity, the effective pressure becomes negative and could mimic a dark energy equation of state. Our microscopic model includes self-interacting spin-zero particles (for which the bulk viscosity is known) that are added to the usual energy content of the universe. We study both background equations and linear perturbations in this model. We show that a dark energy behavior is obtained for reasonable values of the two parameters of the model (i.e. the mass and coupling of the spin-zero particles) and that linear perturbations are well-behaved. There is no apparent fine tuning involved. We also discuss the conditions under which hydrodynamics holds, in particular that the spin-zero particles must be in local equilibrium today for viscous effects to be important.

Gagnon, Jean-Sebastien [Technische Universität Darmstadt, Schlossgartenstrasse 2, 64289, Darmstadt (Germany); Lesgourgues, Julien, E-mail: jean-sebastien.gagnon@physik.tu-darmstadt.de, E-mail: julien.lesgourgues@cern.ch [École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne (Switzerland)

2011-09-01T23:59:59.000Z

257

Bulk emission of scalars by a rotating black hole  

E-Print Network (OSTI)

We study in detail the scalar-field Hawking radiation emitted into the bulk by a higher-dimensional, rotating black hole. We numerically compute the angular eigenvalues, and solve the radial equation of motion in order to find transmission factors. The latter are found to be enhanced by the angular momentum of the black hole, and to exhibit the well-known effect of superradiance. The corresponding power spectra for scalar fields show an enhancement with the number of dimensions, as in the non-rotating case. We compute the total mass loss rate of the black hole for a variety of black-hole angular momenta and bulk dimensions, and find that, in all cases, the bulk emission remains significantly smaller than the brane emission. The angular-momentum loss rate is also computed and found to have a smaller value in the bulk than on the brane. We present accurate bulk-to-brane emission ratios for a range of scenarios.

M. Casals; S. R. Dolan; P. Kanti; E. Winstanley

2008-07-17T23:59:59.000Z

258

High Accuracy Predictions of the Bulk Properties of Water | Argonne  

NLE Websites -- All DOE Office Websites (Extended Search)

High Accuracy Predictions of the Bulk Properties of Water High Accuracy Predictions of the Bulk Properties of Water High Accuracy Predictions of the Bulk Properties of Water PI Name: Mark Gordon PI Email: mark@si.msg.chem.iastate.edu Institution: Iowa State University Allocation Program: ESP Allocation Hours at ALCF: 150 Million Year: 2010 to 2013 Research Domain: Chemistry Among the ab initio methods, second-order perturbation theory (MP2) predicts highly accurate structures and relative energies for water clusters. Researchers will carry out molecular dynamics simulations of water at the MP2 level. However, full MP2 calculations of even modest-sized water clusters are far too time-consuming for dynamical simulations, even on the next-generation Blue Gene. Therefore, a key element of the current approach will be the use of MP2 in conjunction with the Fragment Molecular

259

Bulk Viscosity, Decaying Dark Matter, and the Cosmic Acceleration  

E-Print Network (OSTI)

We discuss a cosmology in which cold dark-matter particles decay into relativistic particles. We argue that such decays could lead naturally to a bulk viscosity in the cosmic fluid. For decay lifetimes comparable to the present hubble age, this bulk viscosity enters the cosmic energy equation as an effective negative pressure. We investigate whether this negative pressure is of sufficient magnitude to account fo the observed cosmic acceleration. We show that a single decaying species in a flat, dark-matter dominated cosmology without a cosmological constant cannot reproduce the observed magnitude-redshift relation from Type Ia supernovae. However, a delayed bulk viscosity, possibly due to a cascade of decaying particles may be able to account for a significant fraction of the apparent cosmic acceleration. Possible candidate nonrelativistic particles for this scenario include sterile neutrinos or gauge-mediated decaying supersymmetric particles.

James R. Wilson; Grant J. Mathews; George M. Fuller

2006-09-25T23:59:59.000Z

260

The origin of efficiency enhancement of inorganic/organic Hybrid solar Cells by robust samarium phosphate nanophosphors  

Science Journals Connector (OSTI)

Abstract An effective energy level regulation of acceptor by doping samarium phosphate nanophosphors (SmPO4 NPs) was reported for inorganic/organic hybrid solar cell applications. SmPO4 \\{NPs\\} doped TiO2/P3HT bulk heterojunction (BHJ) solar cell shows an enhanced power conversion efficiency of approaching 3% as compared with that of its counterpart without SmPO4 \\{NPs\\} (1.98%). The underlying photophysical mechanism was probed by applying femtosecond transient absorption spectroscopy and the results show that the efficiency enhancement was ascribed to the improved hot electron, less energetic electron, hole transports at the interface of BHJ apart from down-conversion photoluminescence of SmPO4 NPs. It has been evidenced that the hot electron transfer life time was shortened by more than 40% (i.e., from ?hot-e=30.2 to 17.9 ps) than pure TiO2 acceptor while the hole transfer lifetime was boosted by almost 20% (i.e., from 6.92 to 5.58 ns). Such charge carrier improvements stem from the efficient energy level regulations by SmPO4 NPs. In detail, the conduction band (CB) edge of TiO2 has been elevated by 0.57 eV while the valence band (VB) edge has been elevated by 0.32 eV, thus not only narrowing down the energy offset between CB energy levels of acceptor TiO2 and donor P3HT, but also meanwhile enlarging the band gap of TiO2 itself that permits to inhibit electron-hole recombination within TiO2. This work demonstrates that samarium ions can efficiently facilitate exciton generation, dissociation and charge transport and have an important role in enhancing photovoltaic performance.

Qinghua Li; Yongbiao Yuan; Taihuei Wei; Yue Li; Zihan Chen; Xiao Jin; Yuancheng Qin; Weifu Sun

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Properties of Bulk Sintered Silver As a Function of Porosity  

SciTech Connect

This report summarizes a study where various properties of bulk-sintered silver were investigated over a range of porosity. This work was conducted within the National Transportation Research Center's Power Device Packaging project that is part of the DOE Vehicle Technologies Advanced Power Electronics and Electric Motors Program. Sintered silver, as an interconnect material in power electronics, inherently has porosity in its produced structure because of the way it is made. Therefore, interest existed in this study to examine if that porosity affected electrical properties, thermal properties, and mechanical properties because any dependencies could affect the intended function (e.g., thermal transfer, mechanical stress relief, etc.) or reliability of that interconnect layer and alter how its performance is modeled. Disks of bulk-sintered silver were fabricated using different starting silver pastes and different sintering conditions to promote different amounts of porosity. Test coupons were harvested out of the disks to measure electrical resistivity and electrical conductivity, thermal conductivity, coefficient of thermal expansion, elastic modulus, Poisson's ratio, and yield stress. The authors fully recognize that the microstructure of processed bulk silver coupons may indeed not be identical to the microstructure produced in thin (20-50 microns) layers of sintered silver. However, measuring these same properties with such a thin actual structure is very difficult, requires very specialized specimen preparation and unique testing instrumentation, is expensive, and has experimental shortfalls of its own, so the authors concluded that the herein measured responses using processed bulk sintered silver coupons would be sufficient to determine acceptable values of those properties. Almost all the investigated properties of bulk sintered silver changed with porosity content within a range of 3-38% porosity. Electrical resistivity, electrical conductivity, thermal conductivity, elastic modulus, Poisson's ratio, and yield stress all depended on the porosity content in bulk-sintered silver. The only investigated property that was independent of porosity in that range was coefficient of thermal expansion.

Wereszczak, Andrew A [ORNL; Vuono, Daniel J [ORNL; Wang, Hsin [ORNL; Ferber, Mattison K [ORNL; Liang, Zhenxian [ORNL

2012-06-01T23:59:59.000Z

262

Bulk viscosity of strongly coupled plasmas with holographic duals  

E-Print Network (OSTI)

We explain a method for computing the bulk viscosity of strongly coupled thermal plasmas dual to supergravity backgrounds supported by one scalar field. Whereas earlier investigations required the computation of the leading dissipative term in the dispersion relation for sound waves, our method requires only the leading frequency dependence of an appropriate Green's function in the low-frequency limit. With a scalar potential chosen to mimic the equation of state of QCD, we observe a slight violation of the lower bound on the ratio of the bulk and shear viscosities conjectured in arXiv:0708.3459.

Steven S. Gubser; Silviu S. Pufu; Fabio D. Rocha

2008-06-02T23:59:59.000Z

263

Bulk viscosity of the gluon plasma in a holographic approach  

E-Print Network (OSTI)

A gravity-scalar model in 5-dim. Riemann space is adjusted to the thermodynamics of SU(3) gauge field theory in the temperature range 1 - 10 $T/T_c$ to calculate holographically the bulk viscosity in 4-dim. Minkowski space. Various settings are compared, and it is argued that, upon an adjustment of the scalar potential to reproduce exactly the lattice data within a restricted temperature interval above $T_c$, rather robust values of the bulk viscosity to entropy density ratio are obtained.

R. Yaresko; B. Kampfer

2014-03-14T23:59:59.000Z

264

Stress tensor and bulk viscosity in relativistic nuclear collisions  

E-Print Network (OSTI)

We discuss the influence of different initial conditions for the stress tensor and the effect of bulk viscosity on the expansion and cooling of the fireball created in relativistic heavy ion collisions. In particular, we explore the evolution...however, it does not significantly increase the entropy produced....

Fries, Rainer J.; Mueller, Berndt; Schaefer, Andreas.

2008-01-01T23:59:59.000Z

265

Development of Bulk Nanocrystalline Cemented Tungsten Carbide for Industrial Applicaitons  

SciTech Connect

This report contains detailed information of the research program entitled "Development of Bulk Nanocrystalline Cemented Tungsten Carbide Materials for Industrial Applications". The report include the processes that were developed for producing nanosized WC/Co composite powders, and an ultrahigh pressure rapid hot consolidation process for sintering of nanosized powders. The mechanical properties of consolidated materials using the nanosized powders are also reported.

Z. Zak Fang, H. Y. Sohn

2009-03-10T23:59:59.000Z

266

Bulk Metallic Glass Nanowire Architecture for Electrochemical Applications  

Science Journals Connector (OSTI)

bulk metallic glasses; nanowires; electrocatalysts; fuel cells; PEMFC; DAFC ... (8) Thus, there has been considerable interest in the development of nanowire fuel cell catalysts. ... To develop such catalysts, several characteristics have to be taken into consideration for their synthesis and assembly. ...

Marcelo Carmo; Ryan C. Sekol; Shiyan Ding; Golden Kumar; Jan Schroers; André D. Taylor

2011-03-03T23:59:59.000Z

267

Differentiating surface and bulk interactions in nanoplasmonic interferometric sensor arrays  

E-Print Network (OSTI)

Detecting specific target analytes and differentiating them from interfering background effects is a crucial but challenging task in complex multi-component solutions commonly encountered in environmental, chemical, biological, and medical sensing applications. Here we present a simple nanoplasmonic interferometric sensor platform that can differentiate the adsorption of a thin protein layer on the sensor surface (surface effects) from bulk refractive index changes (interfering background effects) at a single sensing spot, exploiting the different penetration depths of multiple propagating surface plasmon polaritons excited in the ring-hole nanostructures. A monolayer of bovine serum albumin (BSA) molecules with an effective thickness of 1.91nm is detected and differentiated from a 10-3 change in the bulk refractive index unit of the solution. The noise level of the retrieved real-time sensor output compares favorably with traditional prism-based surface plasmon resonance sensors, but is achieved using a sign...

Zeng, Beibei; Bartoli, Filbert J

2014-01-01T23:59:59.000Z

268

Coefficients of the second viscosity in bulk liquid helium  

Science Journals Connector (OSTI)

The coefficients of the second viscosity in bulk liquid helium are evaluated explicitly as a function of temperature via interactions between the anomalous excitation spectrums. The four coefficients of the second viscosity exhibit a T-1 dependence at low temperatures (well below 0.6 K), which is due to three-phonon processes originating from the anomalous dispersion at very low momenta and temperatures.

Chung-In Um; Chul-Won Jun; Thomas F. George

1992-09-01T23:59:59.000Z

269

Standard practice for bulk sampling of liquid uranium hexafluoride  

E-Print Network (OSTI)

1.1 This practice covers methods for withdrawing representative samples of liquid uranium hexafluoride (UF6) from bulk quantities of the material. Such samples are used for determining compliance with the applicable commercial specification, for example Specification C787 and Specification C996. 1.2 It is assumed that the bulk liquid UF6 being sampled comprises a single quality and quantity of material. This practice does not address any special additional arrangements that might be required for taking proportional or composite samples, or when the sampled bulk material is being added to UF6 residues already in a container (“heels recycle”). 1.3 The number of samples to be taken, their nominal sample weight, and their disposition shall be agreed upon between the parties. 1.4 The scope of this practice does not include provisions for preventing criticality incidents. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of th...

American Society for Testing and Materials. Philadelphia

2001-01-01T23:59:59.000Z

270

File:08COaBulkTransmissionSitingProcess.pdf | Open Energy Information  

Open Energy Info (EERE)

COaBulkTransmissionSitingProcess.pdf Jump to: navigation, search File File history File usage Metadata File:08COaBulkTransmissionSitingProcess.pdf Size of this preview: 463 599...

271

Notes 10. A thermohydrodynamic bulk-flow model for fluid film bearings  

E-Print Network (OSTI)

The complete set of bulk-flow equations for the analysis of turbulent flow fluid film bearings. Importance of thermal effects in process fluid applications. A CFD method for solution of the bulk-flow equations....

San Andres, Luis

2009-01-01T23:59:59.000Z

272

Bulk viscosity of superfluid hyperon stars Mikhail E. Gusakov and Elena M. Kantor  

E-Print Network (OSTI)

Bulk viscosity of superfluid hyperon stars Mikhail E. Gusakov and Elena M. Kantor Ioffe Physical; published 14 October 2008) We calculate the bulk viscosity due to nonequilibrium weak processes bulk viscosity coefficients, with only three of them being independent. In addition, we correct

273

Corrosion of, and cellular responses to MgZnCa bulk metallic glasses Xuenan Gu a  

E-Print Network (OSTI)

Corrosion of, and cellular responses to Mg­Zn­Ca bulk metallic glasses Xuenan Gu a , Yufeng Zheng a: Magnesium alloy Bulk metallic glass Mechanical property Corrosion Cytotoxicity a b s t r a c t Mg­Zn­Ca bulk, mechanical testing, corrosion and cytotoxicity tests. It was found that the Mg66Zn30Ca4 sample presents

Zheng, Yufeng

274

Identification of Avalanche Precursors by Acoustic Probing in the Bulk of Tilted Granular Layers  

E-Print Network (OSTI)

Identification of Avalanche Precursors by Acoustic Probing in the Bulk of Tilted Granular Layers M simultaneously caracterize precursors on the free surface with an optical method and in the bulk with acoustic to probe rearrangements in the bulk of the granular material. A linear method can also be used provided

Paris-Sud XI, Université de

275

Bulk Viscosity of a Gas of Massless Pions  

E-Print Network (OSTI)

In the hadronic phase, the dominant configuration of QCD with two flavors of massless quarks is a gas of massless pions. We calculate the bulk viscosity (zeta) using the Boltzmann equation with the kinetic theory generalized to incorporate the trace anomaly. We find that the dimensionless ratio zeta/s, s being the entropy density, is monotonic increasing below T=120 MeV, where chiral perturbation theory is applicable. This, combined with previous results, shows that zeta/s reaches its maximum near the phase transition temperature Tc, while eta/s, eta being the shear viscosity, reaches its minimum near Tc in QCD with massless quarks.

Jiunn-Wei Chen; Juven Wang

2007-11-30T23:59:59.000Z

276

Bulk Handling of Milk on Texas Dairy Farms.  

E-Print Network (OSTI)

areas dur- tem of handling milk. ing the spring and summer of 1957 on dairy - farms which have converted their operations to Dairymen interviewed in North Texas had tanks ranging from 150 gallons to 1,000 gallons, , the bulk system of producing... and handling milk. while tanks in the Corous Christi area raneDd Texas dairy farmers are operating larger from 200 gallons to 1,000 gallons. The average units, milking more cows, selling more milk and tank in North Texas had a capacity of 400 gal. generally...

Parker, Cecil A.; Stelly, Randall, Moore, Donald S.

1958-01-01T23:59:59.000Z

277

Multifunctional bulk plasma source based on discharge with electron injection  

SciTech Connect

A bulk plasma source, based on a high-current dc glow discharge with electron injection, is described. Electron injection and some special design features of the plasma arc emitter provide a plasma source with very long periods between maintenance down-times and a long overall lifetime. The source uses a sectioned sputter-electrode array with six individual sputter targets, each of which can be independently biased. This discharge assembly configuration provides multifunctional operation, including plasma generation from different gases (argon, nitrogen, oxygen, acetylene) and deposition of composite metal nitride and oxide coatings.

Klimov, A. S.; Medovnik, A. V. [Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050 (Russian Federation); Tyunkov, A. V. [Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050 (Russian Federation); Institute of High Current Electronics, Tomsk 634055 (Russian Federation); Savkin, K. P.; Shandrikov, M. V.; Vizir, A. V. [Institute of High Current Electronics, Tomsk 634055 (Russian Federation)

2013-01-15T23:59:59.000Z

278

Radiative cooling of bulk silicon by incoherent light pump  

SciTech Connect

In contrast to radiative cooling by light up conversion caused exclusively by a low-entropy laser pump and employing thermally assisted fluorescence/luminescence as a power out, we demonstrate light down conversion cooling by incoherent pumps, 0.47–0.94??m light emitting diodes, and employing thermal emission (TE) as a power out. We demonstrate ?3.5?K bulk cooling of Si at 450?K because overall energy of multiple below bandgap TE photons exceeds the energy of a single above bandgap pump photon. We show that using large entropy TE as power out helps avoid careful tuning of an incoherent pump wavelength and cool indirect-bandgap semiconductors.

Malyutenko, V. K., E-mail: malyut@isp.kiev.ua; Bogatyrenko, V. V.; Malyutenko, O. Yu. [V. E. Lashkaryov Institute of Semiconductor Physics, 03028 Kiev (Ukraine)] [V. E. Lashkaryov Institute of Semiconductor Physics, 03028 Kiev (Ukraine)

2013-12-23T23:59:59.000Z

279

New Morphological Paradigm Uncovered in Organic Solar Cells  

NLE Websites -- All DOE Office Websites (Extended Search)

New Morphological Paradigm New Morphological Paradigm Uncovered in Organic Solar Cells New Morphological Paradigm Uncovered in Organic Solar Cells Print Wednesday, 27 April 2011 00:00 Organic solar cells are made of light, flexible, renewable materials; they require simple and inexpensive processing steps and could produce an economically competitive and environmentally friendly energy source. Understanding the fundamentals of organic solar cell function is therefore vital to uncovering their maximum potential. Models describing critical device functions such as charge separation and transport often depend on simplistic morphological assumptions, including discrete interfaces between pure electron donor and acceptor materials. In contrast, recent spectroscopy and scattering studies conducted by North Carolina State University and Cambridge University researchers at ALS Beamlines 5.3.2 and 7.3.3 found a substantial amount of molecular mixing between model materials (polymers and fullerenes) currently used in bulk heterojunction (BHJ) organic solar cells. This suggests that the amorphous portions of these devices do not have pure domains, and the paradigm of device operation may need to be refined to accommodate this newly discovered complexity.

280

New Morphological Paradigm Uncovered in Organic Solar Cells  

NLE Websites -- All DOE Office Websites (Extended Search)

New Morphological Paradigm Uncovered in Organic Solar Cells Print New Morphological Paradigm Uncovered in Organic Solar Cells Print Organic solar cells are made of light, flexible, renewable materials; they require simple and inexpensive processing steps and could produce an economically competitive and environmentally friendly energy source. Understanding the fundamentals of organic solar cell function is therefore vital to uncovering their maximum potential. Models describing critical device functions such as charge separation and transport often depend on simplistic morphological assumptions, including discrete interfaces between pure electron donor and acceptor materials. In contrast, recent spectroscopy and scattering studies conducted by North Carolina State University and Cambridge University researchers at ALS Beamlines 5.3.2 and 7.3.3 found a substantial amount of molecular mixing between model materials (polymers and fullerenes) currently used in bulk heterojunction (BHJ) organic solar cells. This suggests that the amorphous portions of these devices do not have pure domains, and the paradigm of device operation may need to be refined to accommodate this newly discovered complexity.

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

New Morphological Paradigm Uncovered in Organic Solar Cells  

NLE Websites -- All DOE Office Websites (Extended Search)

New Morphological Paradigm Uncovered in Organic Solar Cells Print New Morphological Paradigm Uncovered in Organic Solar Cells Print Organic solar cells are made of light, flexible, renewable materials; they require simple and inexpensive processing steps and could produce an economically competitive and environmentally friendly energy source. Understanding the fundamentals of organic solar cell function is therefore vital to uncovering their maximum potential. Models describing critical device functions such as charge separation and transport often depend on simplistic morphological assumptions, including discrete interfaces between pure electron donor and acceptor materials. In contrast, recent spectroscopy and scattering studies conducted by North Carolina State University and Cambridge University researchers at ALS Beamlines 5.3.2 and 7.3.3 found a substantial amount of molecular mixing between model materials (polymers and fullerenes) currently used in bulk heterojunction (BHJ) organic solar cells. This suggests that the amorphous portions of these devices do not have pure domains, and the paradigm of device operation may need to be refined to accommodate this newly discovered complexity.

282

New Morphological Paradigm Uncovered in Organic Solar Cells  

NLE Websites -- All DOE Office Websites (Extended Search)

New Morphological Paradigm Uncovered in Organic Solar Cells Print New Morphological Paradigm Uncovered in Organic Solar Cells Print Organic solar cells are made of light, flexible, renewable materials; they require simple and inexpensive processing steps and could produce an economically competitive and environmentally friendly energy source. Understanding the fundamentals of organic solar cell function is therefore vital to uncovering their maximum potential. Models describing critical device functions such as charge separation and transport often depend on simplistic morphological assumptions, including discrete interfaces between pure electron donor and acceptor materials. In contrast, recent spectroscopy and scattering studies conducted by North Carolina State University and Cambridge University researchers at ALS Beamlines 5.3.2 and 7.3.3 found a substantial amount of molecular mixing between model materials (polymers and fullerenes) currently used in bulk heterojunction (BHJ) organic solar cells. This suggests that the amorphous portions of these devices do not have pure domains, and the paradigm of device operation may need to be refined to accommodate this newly discovered complexity.

283

Scanning Tunneling Macroscopy, Black Holes, and AdS/CFT Bulk Locality  

E-Print Network (OSTI)

We establish resolution bounds on reconstructing a bulk field from boundary data on a timelike hypersurface. If the bulk only supports propagating modes, reconstruction is complete. If the bulk also supports evanescent modes, local reconstruction is not achievable unless one has exponential precision in knowledge of the boundary data. Without exponential precision, for a Minkowski bulk, one can reconstruct a spatially coarse-grained bulk field, but only out to a depth set by the coarse-graining scale. For an asymptotically AdS bulk, reconstruction is limited to a spatial coarse-graining proper distance set by the AdS scale. AdS black holes admit evanescent modes. We study the resolution bound in the large AdS black hole background and provide a dual CFT interpretation. Our results demonstrate that, if there is a black hole of any size in the bulk, then sub-AdS bulk locality is no longer well-encoded in boundary data in terms of local CFT operators. Specifically, in order to probe the bulk on sub-AdS scales using only boundary data in terms of local operators, one must either have such data to exponential precision or make further assumptions about the bulk state.

Soo-Jong Rey; Vladimir Rosenhaus

2014-06-02T23:59:59.000Z

284

Methods of synthesizing hydroxyapatite powders and bulk materials  

DOE Patents (OSTI)

Methods are provided for producing non-porous controlled morphology hydroxyapatite granules of less than 8 .mu.m by a spray-drying process. Solid or hollow spheres or doughnuts can be formed by controlling the volume fraction and viscosity of the slurry as well as the spray-drying conditions. Methods of providing for homogenous cellular structure hydroxyapatite granules are also provided. Pores or channels or varying size and number can be formed by varying the temperature at which a hydroxyapatite slurry formed in basic, saturated ammonium hydroxide is spray-dried. Methods of providing non-porous controlled morphology hydroxyapatite granules in ammonium hydroxide are also provided. The hydroxyapatite granules and bulk materials formed by these methods are also provided.

Luo, Ping (2843A Forest Ave., Berkeley, CA 94705)

1999-01-12T23:59:59.000Z

285

Methods of synthesizing hydroxyapatite powders and bulk materials  

DOE Patents (OSTI)

Methods are provided for producing non-porous controlled morphology hydroxyapatite granules of less than 8 {micro}m by a spray-drying process. Solid or hollow spheres or doughnuts can be formed by controlling the volume fraction and viscosity of the slurry as well as the spray-drying conditions. Methods of providing for homogeneous cellular structure hydroxyapatite granules are also provided. Pores or channels or varying size and number can be formed by varying the temperature at which a hydroxyapatite slurry formed in basic, saturated ammonium hydroxide is spray-dried. Methods of providing non-porous controlled morphology hydroxyapatite granules in ammonium hydroxide are also provided. The hydroxyapatite granules and bulk materials formed by these methods are also provided. 26 figs.

Luo, P.

1999-01-12T23:59:59.000Z

286

FINITE ELEMENT ANALYSIS OF BULK TRITIUM SHIPPING PACKAGE  

SciTech Connect

The Bulk Tritium Shipping Package was designed by Savannah River National Laboratory. This package will be used to transport tritium. As part of the requirements for certification, the package must be shown to meet the scenarios of the Hypothetical Accident Conditions (HAC) defined in Code of Federal Regulations Title 10 Part 71 (10CFR71). The conditions include a sequential 30-foot drop event, 30-foot dynamic crush event, and a 40-inch puncture event. Finite Element analyses were performed to support and expand upon prototype testing. Cases similar to the tests were evaluated. Additional temperatures and orientations were also examined to determine their impact on the results. The peak stress on the package was shown to be acceptable. In addition, the strain on the outer drum as well as the inner containment boundary was shown to be acceptable. In conjunction with the prototype tests, the package was shown to meet its confinement requirements.

Jordan, J.

2010-06-02T23:59:59.000Z

287

Scenario Projections for Future Market Potentials of Biobased Bulk Chemicals  

Science Journals Connector (OSTI)

Product values are production costs plus profits, and they include variable costs, fixed costs, taxes, insurance fees, plant overheads, allowance for marketing, administration, and R&D, as well as a so-called capital charge representing depreciation and profits. ... Future fossil fuel prices depend on (global) political developments, developments of reserves, exploitation of different fossil resources, and demand. ... This research was partly supported by the European Commission (Research Directorate General), 5th Framework European Network (GROWTH) Program by support of the project “BREW” with the full title “Medium and long-term opportunities and risks of the biotechnological production of bulk chemicals from renewable resources” (Contract No. G5MA-CT-2002-00014). ...

Veronika Dornburg; Barbara G. Hermann; Martin K. Patel

2008-02-23T23:59:59.000Z

288

Bulk viscous FWR with time varying constants revisited  

E-Print Network (OSTI)

We study a full causal bulk viscous cosmological model with flat FRW symmetries and where the ``constants'' $G,c$ and $\\Lambda $ vary. We take into account the possible effects of a $c-$variable into the curvature tensor in order to outline the field equations. Using the Lie method we find the possible forms of the ``constants'' $G$ and $c$ that make integrable the field equations as well as the equation of state for the viscous parameter. It is found that $G,c$ and $\\Lambda $ follow a power law solution verifying the relationship $G/c^{2}=\\kappa .$ Once these possible forms have been obtained we calculate the thermodynamical quantities of the model in order to determine the possible values of the parameters that govern the quantities, finding that only a growing $G$ and $c$ are possible while $% \\Lambda $ behaves as a negative decreasing function.

J. A. Belinchón

2005-01-07T23:59:59.000Z

289

Factors affecting characterization of bulk high-temperature superconductors  

SciTech Connect

Three major factors affect the characterization of bulk high-temperature superconductors in terms of their levitation properties during interaction with permanent magnets. First, the appropriate parameter for the permanent magnet is internal magnetization, not the value of the magnetic field measured at the magnet`s surface. Second, although levitation force grows with superconductor thickness and surface area, for a given permanent magnet size, comparison of levitation force between samples is meaningful when minimum values are assigned to the superconductor size parameters. Finally, the effect of force creep must be considered when time-averaging the force measurements. In addition to levitational force, the coefficient of friction of a levitated rotating permanent magnet may be used to characterize the superconductor.

Hull, J.R. [Argonne National Lab., IL (United States). Energy Technology Div.

1997-11-01T23:59:59.000Z

290

Freeze-out by bulk viscosity driven instabilities  

E-Print Network (OSTI)

We describe a new scenario (first introduced in [G. Torrieri, B. Tom\\'a\\v{s}ik and I. Mishustin, Phys. Rev. C \\textbf{77}, 034903 (2008)]) for freezeout in heavy ion collisions that could solve the lingering problems associated with the so-called HBT puzzle. We argue that bulk viscosity increases as $T$ approaches $T_c$. The fluid {then} becomes unstable against small perturbations, and fragments into clusters of a size much smaller than the total size of the system. These clusters maintain the pre-existing outward-going flow, as a spray of droplets, but develop no flow of their own, and hadronize by evaporation. We show that this scenario can explain HBT data and suggest how it can be experimentally tested.

Torrieri, Giorgio; Mishustin, Igor

2008-01-01T23:59:59.000Z

291

Application of surface and bulk characterization techniques for coal preparation  

SciTech Connect

With the recent acceleration of development of surface-property-based processes for the beneficiation of ultrafine coal, it is essential to establish their underlying scientific principles and to develop mathematical models able to predict how the process will perform on an unknown coal. Various surface properties of importance, surface characterization techniques, and application of these techniques to coal are reviewed. Instrumental techniques used for analyzing bulk composition of organic and/or inorganic matter are also reviewed. The differences in coal and mineral matter properties are highlighted. The effect of particle history, including grinding and oxidation, on the surface properties of coal is discussed. The mechanisms of advanced physical beneficiation processes are reviewed, and the influence of surface properties on the effectiveness of separation between coal and the liberated mineral matter is discussed. Finally, recommendations for future areas of research are made. 121 refs., 19 figs., 17 tabs.

Gala, H.B. (Burns and Roe Services Corp., Pittsburgh, PA (USA)); Hucko, R.E. (USDOE Pittsburgh Energy Technology Center, PA (USA). Coal Preparation and Solids Transportation Div.)

1990-01-01T23:59:59.000Z

292

Effect of bulk density of coking coal on swelling pressure  

Science Journals Connector (OSTI)

Abstract Coking coals are the important raw materials for the iron and steel industries and play an important role on its sustainable development, especially on the stamp-charging coke making with the characteristics of increasing the bulk density. There is a significance on the reasonable usage of the coking coal resource with the reduced production cost, improved efficiency of the economy to develop the stamp-charging coke making technology. Important effects of the density of coking coal on the coking and caking properties were investigated. In the article, the maximum values of swelling pressure and variation of Laowan gas coal and Xinjian 1/3 coking coal, Longhu fat coal and Didao coking coal, which were mined at Shenyang and Qitaihe respectively, were investigated under different bulk densities during the coking. The results showed that when the values of density increased from 0.85 ton/m3 to 1.05 ton/m3, for the Laowan gas coal, swelling pressure variation and even the maximum value changed slightly. The swelling pressure was 3.63 \\{KPa\\} when the density was improved to 1.05 ton/m3; for the Xinjian 1/3 coking coal, the values of swelling pressure changed significantly and the maximum values was 82.88 \\{KPa\\} with the density improved to 1.05 when the coal was heated to 600°C. The coke porosity, which was investigated by automatic microphotometer, decreased from 47.4% to 33.1% with the increasing of the density from 0.85 ton/m3 to 1.05 ton/m3, and the decreased value was 14.3%. Meanwhile, the pore structures of four cokes were characterized by an optical microscope.

Jinfeng Bai; Chunwang Yang; Zhenning Zhao; Xiangyun Zhong; Yaru Zhang; Jun Xu; Bai Xi; Hongchun Liu

2013-01-01T23:59:59.000Z

293

Bulk viscosity of strange matter and r-modes in neutron stars  

E-Print Network (OSTI)

We discuss bulk viscosity due to non-leptonic processes involving hyperons and Bose-Einstein condensate of negatively charged kaons in neutron stars. It is noted that the hyperon bulk viscosity coefficient is a few order of magnitude larger than that of the case with the condensate. Further it is found that the hyperon bulk viscosity is suppressed in a superconducting phase. The hyperon bulk viscosity efficiently damps the r-mode instability in neutron stars irrespective of whether a superconducting phase is present or not in neutron star interior.

Debarati Chatterjee; Debades Bandyopadhyay

2008-12-30T23:59:59.000Z

294

Bulk photovoltaic effect and photorefractive grating formation in lithium niobate with picosecond light pulses  

Science Journals Connector (OSTI)

I investigated photorefractive grating formation in materials exhibiting the bulk photovoltaic effect on illumination with weak, very short light pulses. For a light pulse shorter...

Okamura, Hideki

2001-01-01T23:59:59.000Z

295

Evaluation of ANSI compression in a bulk data file transfer system.  

E-Print Network (OSTI)

??This report evaluates the use of a newly proposed American National Standard Institute (ANSI) standard for data compression in a bulk data transmission system. An… (more)

Chaulklin, Douglas Gary

2010-01-01T23:59:59.000Z

296

E-Print Network 3.0 - air-processed polymer-fullerene bulk Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

are currently seen as attractive materials for optoelectronic applications such as light-emitting diodes and solar cells. Excitonic processes play Summary: phase of bulk...

297

The Role of Surface Chemistry and Bulk Properties on the Cycling...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

(ANL) Research Objectives: To develop fundamental understanding of surface chemistry and bulk cation distributions on cycling performance and rate capability To...

298

The Role of Surface Chemistry and Bulk Properties on the Cycling...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

and Rate Capability of Lithium Positive Electrode Materials The Role of Surface Chemistry and Bulk Properties on the Cycling and Rate Capability of Lithium Positive Electrode...

299

Suppression of bulk conductivity in InAs/GaSb broken gap composite quantum wells  

SciTech Connect

The two-dimensional topological insulator state in InAs/GaSb quantum wells manifests itself by topologically protected helical edge channel transport relying on an insulating bulk. This work investigates a way of suppressing bulk conductivity by using gallium source materials of different degrees of impurity concentrations. While highest-purity gallium is accompanied by clear conduction through the sample bulk, intentional impurity incorporation leads to a bulk resistance over 1 M?, independent of applied magnetic fields. In addition, ultra high electron mobilities for GaAs/AlGaAs structures fabricated in a molecular beam epitaxy system used for the growth of Sb-based samples are reported.

Charpentier, Christophe; Fält, Stefan; Reichl, Christian; Nichele, Fabrizio; Nath Pal, Atindra; Pietsch, Patrick; Ihn, Thomas; Ensslin, Klaus; Wegscheider, Werner [Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich (Switzerland)] [Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich (Switzerland)

2013-09-09T23:59:59.000Z

300

Multi-parameter on-line coal bulk analysis  

SciTech Connect

This was a four-year grant that was given a no cost extension for one more year. The purpose of the grant was to develop a pulsed neutron-based technique that could measure on-line all the major and minor elements in coal. Such measurements would allow the continuous monitoring of bulk parameters such as coal heating value (BTU/lb), volatile matter, moisture etc., deemed important to the coal industry. Such parameters, along with the continuous measurement of elements such as sulfur and sodium, are of major economic and environmental concern, and their measurement would assist in a more efficient use of the coal-fired boilers, as well as limiting emissions controlled by the 1990 Clean Air Act Amendments. It was hoped that this study would lead to the development of a technique able to create a marketable product, an On-Line Elemental Coal Analyzer. The study was separated in the following major parts: (1) Devise an efficient system for the detection of gamma rays; (2) Prior to experimentation, perform modeling and simulations for items such as detector shielding, coal sample configuration, and neutron tube collimation; (3) Develop a computer code for data reduction and analysis; (4) Measure the elemental composition of various coal samples; and (5) Design a prototype, on-line elemental coal analyzer, based on the PFTNA principle.

NONE

1999-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

International Round-Robin Testing of Bulk Thermoelectrics  

SciTech Connect

Two international round-robin studies were conducted on transport properties measurements of bulk thermoelectric materials. The study discovered current measurement problems. In order to get ZT of a material four separate transport measurements must be taken. The round-robin study showed that among the four properties Seebeck coefficient is the one can be measured consistently. Electrical resistivity has +4-9% scatter. Thermal diffusivity has similar +5-10% scatter. The reliability of the above three properties can be improved by standardizing test procedures and enforcing system calibrations. The worst problem was found in specific heat measurements using DSC. The probability of making measurement error is great due to the fact three separate runs must be taken to determine Cp and the baseline shift is always an issue for commercial DSC. It is suggest the Dulong Petit limit be always used as a guide line for Cp. Procedures have been developed to eliminate operator and system errors. The IEA-AMT annex is developing standard procedures for transport properties testing.

Wang, Hsin [ORNL; Porter, Wallace D [ORNL; Bottner, Harold [Fraunhofer-Institute, Freiburg, Germany; Konig, Jan [Fraunhofer-Institute, Freiburg, Germany; Chen, Lidong [Chinese Academy of Sciences; Bai, Shengqiang [Chinese Academy of Sciences; Tritt, Terry M. [Clemson University; Mayolett, Alex [Corning, Inc; Smith, Charlene [Corning, Inc; Harris, Fred [ZT-Plus; Sharp, Jeff [Marlow Industries, Inc; Lo, Jason [CANMET - Materials Technology Laboratory, Natural Resources of Canada; Keinke, Holger [University of Waterloo, Canada; Kiss, Laszlo I. [University of Quebec at Chicoutimi

2011-11-01T23:59:59.000Z

302

Nanochannel-Directed Growth of One-Dimensional Multi-Segment Heterojunctions of Metallic Au1-xGex and Semiconducting Ge  

SciTech Connect

We report on the synthesis of multi-segment nanowire (NW) junctions of Au{sub 1-x}Ge{sub x} and Ge inside the nanochannels of porous anodic aluminum oxide template. The one-dimensional heterostructures are grown with a low-temperature chemical vapor deposition process, assisted by electrodeposited Au nanowires (AuNWs). The Au-catalyzed vapor-liquid-solid growth process occurs simultaneously in multiple locations along the nanochannel, which leads to multi-segment Au{sub 1-x}Ge{sub x}/Ge heterojunctions. The structures of the as-grown hybrid NWs, analyzed by using transmission electron microscopy and energy-dispersive X-ray spectroscopy elemental mapping, show clear compositional modulation with variable modulation period and controllable junction numbers. Remarkably, both GeNW and Au{sub 1-x}Ge{sub x}NW segments are single crystalline with abrupt interfaces and good crystallographic coherences. The electronic and transport properties of individual NW junctions are measured by using a multi-probe scanning tunneling microscope, which confirms the semiconducting nature of Ge segments and the metallic behavior of Au{sub 1-x}Ge{sub x} segments, respectively. The high yield of multiple segment NW junctions of a metal-semiconductor can facilitate the applications in nanoelectronics and optoelectronics that harness multiple functionalities of heterointerfaces.

Li, Xiangdong [Chinese Academy of Sciences; Meng, Guowen [Chinese Academy of Sciences; Qin, Shengyong [ORNL; Xu, Qiaoling [Chinese Academy of Sciences; Chu, Zhaoqin [Chinese Academy of Sciences; Zhu, Xiaoguang [Chinese Academy of Sciences; Kong, Mingguang [Chinese Academy of Sciences; Li, An-Ping [ORNL

2012-01-01T23:59:59.000Z

303

Explosive shock processing of Pr2Fe14B/ Fe exchange-coupled nanocomposite bulk magnets  

E-Print Network (OSTI)

Explosive shock processing of Pr2Fe14B/ ­Fe exchange-coupled nanocomposite bulk magnets Z.Q. Jin between neigh- boring magnetic phases.1,2 The prerequisite for effective exchange coupling is a small are usually used to produce single-phase microcrystalline permanent magnets, are not favored in making bulk

Liu, J. Ping

304

Corrosion performances in simulated body fluids and cytotoxicity evaluation of Fe-based bulk metallic glasses  

E-Print Network (OSTI)

Corrosion performances in simulated body fluids and cytotoxicity evaluation of Fe-based bulk December 2011 Available online 27 December 2011 Keywords: Bulk metallic glass Corrosion Biocompatibility Electrochemical characterization Biomedical applications The aim of this work is to investigate the corrosion

Zheng, Yufeng

305

ADAPTIVE TRANSFER ADJUSTMENT IN EFFICIENT BULK DATA TRANSFER MANAGEMENT FOR CLIMATE DATASET  

E-Print Network (OSTI)

ADAPTIVE TRANSFER ADJUSTMENT IN EFFICIENT BULK DATA TRANSFER MANAGEMENT FOR CLIMATE DATASET Alex,mbalman,ashoshani,vnatarajan}@lbl.gov, williams13@llnl.gov ABSTRACT Many scientific applications and experiments, such as high energy and nuclear is the limited network capacity for moving large datasets. A tool that addresses this challenge is the Bulk Data

306

Spectroscopic Imaging of Single AtomsWithin a Bulk Solid S. D. Findlay,2  

E-Print Network (OSTI)

identification of single atoms on surfaces, but they cannot probe individual atoms within the bulk environmentSpectroscopic Imaging of Single AtomsWithin a Bulk Solid M.Varela,1 S. D. Findlay,2 A. R. Lupini,1, but their spectroscopic identification, with spatial resolution at the atomic scale. This substan- tial improvement

Pennycook, Steve

307

Equality of bulk and edge Hall conductances for continuous magnetic random Schrödinger operators  

E-Print Network (OSTI)

In this note, we prove the equality of the quantum bulk and the edge Hall conductances in mobility edges and in presence of disorder. The bulk and edge perturbations can be either of electric or magnetic nature. The edge conductance is regularized in a suitable way to enable the Fermi level to lie in a region of localized states.

Amal Taarabt

2014-03-30T23:59:59.000Z

308

Bulk viscosity-driven suppression of shear viscosity effects on the flow harmonics at RHIC  

E-Print Network (OSTI)

The interplay between shear and bulk viscosities on the flow harmonics, $v_n$'s, at RHIC is investigated using the newly developed relativistic 2+1 hydrodynamical code v-USPhydro that includes bulk and shear viscosity effects both in the hydrodynamic evolution and also at freeze-out. While shear viscosity is known to attenuate the flow harmonics, we find that the inclusion of bulk viscosity decreases the shear viscosity-induced suppression of the flow harmonics bringing them closer to their values in ideal hydrodynamical calculations. Depending on the value of the bulk viscosity to entropy density ratio, $\\zeta/s$, in the quark-gluon plasma, the bulk viscosity-driven suppression of shear viscosity effects on the flow harmonics may require a re-evaluation of the previous estimates of the shear viscosity to entropy density ratio, $\\eta/s$, of the quark-gluon plasma previously extracted by comparing hydrodynamic calculations to heavy ion data.

J. Noronha-Hostler; J. Noronha; F. Grassi

2014-06-12T23:59:59.000Z

309

An overview of rotating machine systems with high-temperature bulk superconductors  

Science Journals Connector (OSTI)

The paper contains a review of recent advancements in rotating machines with bulk high-temperature superconductors (HTS). The high critical current density of bulk HTS enables us to design rotating machines with a compact configuration in a practical scheme. The development of an axial-gap-type trapped flux synchronous rotating machine together with the systematic research works at the Tokyo University of Marine Science and Technology since 2001 are briefly introduced. Developments in bulk HTS rotating machines in other research groups are also summarized. The key issues of bulk HTS machines, including material progress of bulk HTS, in situ magnetization, and cooling together with AC loss at low-temperature operation are discussed.

Difan Zhou; Mitsuru Izumi; Motohiro Miki; Brice Felder; Tetsuya Ida; Masahiro Kitano

2012-01-01T23:59:59.000Z

310

Stability of Bulk Metallic Glass Structure. Final Report  

SciTech Connect

The fundamental origins of the stability of the (Pd-Ni){sub 80}P{sub 20} bulk metallic glasses (BMGs), a prototype for a whole class of BMG formers, were explored. While much of the properties of their BMGs have been characterized, their glass-stability have not been explained in terms of the atomic and electronic structure. The local structure around all three constituent atoms was obtained, in a complementary way, using extended X-ray absorption fine structure (EXAFS), to probe the nearest neighbor environment of the metals, and extended energy loss fine structure (EXELFS), to investigate the environment around P. The occupied electronic structure was investigated using X-ray photoelectron spectroscopy (XPS). The (Pd-Ni){sub 80}P{sub 20} BMGs receive their stability from cumulative, and interrelated, effects of both atomic and electronic origin. The stability of the (Pd-Ni){sub 80}P{sub 20} BMGs can be explained in terms of the stability of Pd{sub 60}Ni{sub 20}P{sub 20} and Pd{sub 30}Ni{sub 50}P{sub 20}, glasses at the end of BMG formation. The atomic structure in these alloys is very similar to those of the binary phosphide crystals near x=0 and x=80, which are trigonal prisms of Pd or Ni atoms surrounding P atoms. Such structures are known to exist in dense, randomly-packed systems. The structure of the best glass former in this series, Pd{sub 40}Ni{sub 40}P{sub 20} is further described by a weighted average of those of Pd{sub 30}Ni{sub 50}P{sub 20} and Pd{sub 60}Ni{sub 20}P{sub 20}. Bonding states present only in the ternary alloys were found and point to a further stabilization of the system through a negative heat of mixing between Pd and Ni atoms. The Nagel and Tauc criterion, correlating a decrease in the density of states at the Fermi level with an increase in the glass stability, was consistent with greater stability of the Pd{sub x}Ni{sub 80-x}P{sub 20} glasses with respect to the binary alloys of P. A valence electron concentration of 1.8 e/a, which ensures the superpositioning of the first peak in the structure factor with twice the Fermi momentum, was used to calculate the interatomic potential of these alloys. The importance of Pd to the stability of the alloys is evidenced by the fact that replacing Ni and Pd places the nearest neighbor distances at more attractive positions in this potential.

Jain, H.; Williams, D. B.

2003-06-01T23:59:59.000Z

311

Bulk Nanostructured FCC Steels With Enhanced Radiation Tolerance  

SciTech Connect

The objective of this project is to increase radiation tolerance in austenitic steels through optimization of grain size and grain boundary (GB) characteristics. The focus will be on nanocrystalline austenitic Fe-Cr-Ni alloys with an fcc crystal structure. The long-term goal is to design and develop bulk nanostructured austenitic steels with enhanced void swelling resistance and substantial ductility, and to enhance their creep resistance at elevated temperatures via GB engineering. The combination of grain refinement and grain boundary engineering approaches allows us to tailor the material strength, ductility, and resistance to swelling by 1) changing the sink strength for point defects, 2) by increasing the nucleation barriers for bubble formation at GBs, and 3) by changing the precipitate distributions at boundaries. Compared to ferritic/martensitic steels, austenitic stainless steels (SS) possess good creep and fatigue resistance at elevated temperatures, and better toughness at low temperature. However, a major disadvantage of austenitic SS is that they are vulnerable to significant void swelling in nuclear reactors, especially at the temperatures and doses anticipated in the Advanced Burner Reactor. The lack of resistance to void swelling in austenitic alloys led to the switch to ferritic/martensitic steels as the preferred material for the fast reactor cladding application. Recently a type of austenitic stainless steel, HT-UPS, was developed at ORNL, and is expected to show enhanced void swelling resistance through the trapping of point defects at nanometersized carbides. Reducing the grain size and increasing the fraction of low energy grain boundaries should reduce the available radiation-produced point defects (due to the increased sink area of the grain boundaries), should make bubble nucleation at the boundaries less likely (by reducing the fraction of high-energy boundaries), and improve the strength and ductility under radiation by producing a higher density of nanometer sized carbides on the boundaries. This project will focus on void swelling but advances in processing of austenitic steels are likely to also improve the radiation response of the mechanical properties.

Xinghang Zhang; Hartwig, K. Ted; Todd Allen; Yong Yang

2012-10-27T23:59:59.000Z

312

Effect of demagnetization on magnetic resonance line shapes in bulk samples: Application to tungsten  

Science Journals Connector (OSTI)

A calculation of the contribution of a bulk specimen's nonuniform demagnetizing field to the inhomogeneous broadening of magnetic resonance lines is described. Demagnetization effects are of particular importance for substances with large bulk magnetic susceptibilities located in large static magnetic fields. Application is made to the nuclear acoustic resonance of W183 spins in a bulk cylindrical specimen of tungsten. In addition to explaining the observed inhomogeneous line broadening, the calculation predicts a "satellite" line which is also observed experimentally. Although attention is paid to specifically acoustic considerations, the calculation is applicable to magnetic resonance in general.

George Mozurkewich; H. I. Ringermacher; D. I. Bolef

1979-07-01T23:59:59.000Z

313

Muon (g-2) from the bulk neutrino field in a warped extra dimensional model  

E-Print Network (OSTI)

In the Randall-Sundrum model, a bulk neutrino field in the 5-dimensional space-time can give rise to tiny Dirac masses to neutrinos. In such a scenario, we have computed the contribution of the bulk neutrino field to the anomalous magnetic moment $(g-2)_\\mu$ of muon. We have computed this contribution in the 't Hooft-Feynman gauge and have found that the contribution has the right sign to fit the current discrepancy between the experiment and the standard model value of $(g-2)_\\mu$. We have also studied possible constraints on the model parameters by including contributions to $(g-2)_\\mu$ from other sources such as bulk gravitons.

R. S. Hundi; Sourov Roy; Soumitra SenGupta

2012-06-22T23:59:59.000Z

314

Dynamical and Microphysical Evolution during Mixed-Phase Cloud Glaciation Simulated Using the Bulk Adaptive Habit Prediction Model  

Science Journals Connector (OSTI)

A bulk microphysics scheme predicting ice particle habit evolution has been implemented in the Weather Research and Forecasting Model. Large-eddy simulations are analyzed to study the effects of ice habit and number concentration on the bulk ice ...

Kara J. Sulia; Hugh Morrison; Jerry Y. Harrington

2014-11-01T23:59:59.000Z

315

Understanding Bulk Power Reliability: The Importance of Good Data and A Critical Review of Existing Sources  

NLE Websites -- All DOE Office Websites (Extended Search)

Understanding Bulk Power Reliability: Understanding Bulk Power Reliability: The Importance of Good Data and A Critical Review of Existing Sources Emily Fisher Lawrence Berkeley National Laboratory esfisher@lbl.gov Joseph H. Eto Lawrence Berkeley National Laboratory jheto@lbl.gov Kristina Hamachi LaCommare Lawrence Berkeley National Laboratory kshamachi@lbl.gov Abstract Bulk power system reliability is of critical importance to the electricity sector. Complete and accurate information on events affecting the bulk power system is essential for assessing trends and efforts to maintain or improve reliability. Yet, current sources of this information were not designed with these uses in mind. They were designed, instead, to support real-time emergency notification to industry and government first-responders. This

316

Strontium Titanate DC Electric Field Switchable and Tunable Bulk Acoustic Wave Solidly Mounted Resonator  

E-Print Network (OSTI)

Strontium Titanate DC Electric Field Switchable and Tunable Bulk Acoustic Wave Solidly Mounted Abstract - A voltage switchable/tunable strontium titanate solidly mounted BAW resonator was implemented films, piezoelectric resonators. I. INTRODUCTION Strontium titanate (STO) and barium strontium titanate

York, Robert A.

317

A new class of high ZT doped bulk nanothermoelectrics through bottom-up synthesis  

Energy.gov (U.S. Department of Energy (DOE))

Reports on synthesis of large quantities of p- and n-type nanocrystals then sintered into bulk samples with high power factors and low thermal conductivity through impurity doping and nanostructuring

318

E-Print Network 3.0 - activity-dependent bulk endocytosis Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

results for: activity-dependent bulk endocytosis Page: << < 1 2 3 4 5 > >> 1 VESICLE RECYCLING AT RIBBON SYNAPSES IN THE FINELY BRANCHED AXON TERMINALS OF MOUSE RETINAL BIPOLAR...

319

Photovoltaics for Bulk Power Applications: Cost/Performance Targets and Technology Prospects  

Science Journals Connector (OSTI)

Photovoltaic (PV) power technology has shown steady progress over the past ten years toward its ultimate use in bulk — i.e., energy-significant — electric power applications, including demonstration of highly ...

Edgar A. DeMeo

1991-01-01T23:59:59.000Z

320

Bulk Migration of Ni/NiO in Ni-YSZ during Reducing Conditions...  

NLE Websites -- All DOE Office Websites (Extended Search)

random grain orientation. The surface analysis and mapping were carried out using ToF-SIMS and AES whereas EDS maps on FIB sliced areas on Ni-YSZ were utilized for the bulk...

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Correlation Between Structure and Thermoelectric Properties of Bulk High Performance Materials for Energy Conversion  

Energy.gov (U.S. Department of Energy (DOE))

Rapid solidified precursor converted into crystalline bulks under pressure produced thermoelectric materials of nano-sized grains with strongly coupled grain boundaries, achieving reduced lattice thermal conductivity and increased power factor

322

Evaluation of Residual Stresses in the Bulk of Materials by High Energy Synchrotron Diffraction  

Science Journals Connector (OSTI)

High energy synchrotron diffraction is introduced as a new ... for residual stress analysis in the bulk of materials. It is shown that energy dispersive measurements are sufficiently precise so that...?4...can be...

W. Reimers; M. Broda; G. Brusch; D. Dantz…

1998-09-01T23:59:59.000Z

323

Evaluation of residual stresses in the bulk of materials by high energy synchrotron diffraction  

Science Journals Connector (OSTI)

High energy synchrotron diffraction is introduced as a new ... for residual stress analysis in the bulk of materials. It is shown that energy dispersive measurements are sufficiently precise so that...?4...can be...

W. Reimers; M. Broda; G. Brusch; D. Dantz…

1998-09-01T23:59:59.000Z

324

Bulk power risk analysis : ranking infrastructure elements according to their risk significance  

E-Print Network (OSTI)

Disruptions in the bulk power grid can result in very diverse consequences that include economic, social, physical, and psychological impacts. In addition, power outages do not affect all end-users of the system in the ...

Koonce, Anthony M

2006-01-01T23:59:59.000Z

325

Nonequilibrium molecular dynamics simulations of confined fluids in contact with the bulk  

E-Print Network (OSTI)

Nonequilibrium molecular dynamics simulations of confined fluids in contact with the bulk Luzheng Zhang, Ramkumar Balasundaram,a) and Stevin H. Gehrke Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506 Shaoyi Jiangb) Department of Chemical Engineering, University

Zhang, Luzheng

326

Residential Bulk-Fed Wood-Pellet Central Boilers and Furnace Rebate Program  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Residential Bulk-Fed Wood-Pellet Central Boilers and Furnace Rebate Residential Bulk-Fed Wood-Pellet Central Boilers and Furnace Rebate Program Residential Bulk-Fed Wood-Pellet Central Boilers and Furnace Rebate Program < Back Eligibility Multi-Family Residential Residential Savings Category Heating & Cooling Commercial Heating & Cooling Heating Maximum Rebate $6,000 Program Info Funding Source New Hampshire Renewable Energy Fund (FY 2013) Start Date 04/14/2010 Expiration Date When progr State New Hampshire Program Type State Rebate Program Rebate Amount 30% Provider New Hampshire Public Utilities Commission The New Hampshire Public Utilities Commission (PUC) is offering rebates of 30% of the installed cost of qualifying new residential bulk-fed, wood-pellet central heating boilers or furnaces. The maximum rebate is $6,000. To qualify, systems must (1) become operational on or after May 1,

327

High-Energy, Low-Frequency Risk to the North American Bulk Power System  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

High-Energy, Low-Frequency Risk to the North American Bulk Power High-Energy, Low-Frequency Risk to the North American Bulk Power System (June 2010) High-Energy, Low-Frequency Risk to the North American Bulk Power System (June 2010) A Jointly-Commissioned Summary Report of the North American Electric Reliability Corporation and the U.S. Department of Energy's November 2009 Workshop. The North American Electric Reliability Corporation (NERC) and the U.S. Department of Energy (DOE) partnered in July of 2009 on an effort to address High-Impact, Low-Frequency risks to the North American bulk power system. In August, NERC formed a steering committee made up of industry and risk experts to lead the development of an initial workshop on the subject, chaired by Scott Moore, VP Transmission System & Region Operations for American Electric Power, and Robert Stephan, Former Assistant Secretary for

328

E-Print Network 3.0 - al bulk crystals Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

are homogeneously dispersed in the residual glass of the bulk for Tc... consists of titanite (CaTiSiO5) and anorthite (CaAl2Si2O8) crystals that have nucleated heterogeneously......

329

Using first principles Destiny Functional Theory methods to model the Seebeck coefficient of bulk silicon  

E-Print Network (OSTI)

Thermoelectrics are gaining significant amounts of attention considering their relevance today in the areas of sustainable energy generation and energy efficiency. In this thesis, the thermoelectric properties of bulk ...

Mehra, Saahil

2008-01-01T23:59:59.000Z

330

Bulk and track etch properties of CR-39 SSNTD etched in NaOH/ethanol  

E-Print Network (OSTI)

Bulk and track etch properties of CR-39 SSNTD etched in NaOH/ethanol K.F. Chan, F.M.F. Ng, D. described the use of NaOH/ethanol as an etchant for the CR-39 detector, and have determined the corre and track etch properties of CR- 39 in NaOH/ethanol were derived from direct measurements. The bulk etch

Yu, K.N.

331

An analysis of bulk agricultural commodity buying behavior in selected developing economies  

E-Print Network (OSTI)

AN ANALYSIS OF BULK AGRICULTURAL COMMODITY BUYING BEHAVIOR IN SELECTED DEVELOPING ECONOMIES A Thesis by Kimberly Renee Moore Submitted to the Graduate College of Texas AAM University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE May 1982 Major Subject: Agricultural Economics AN ANALYSIS OF BULK AGRICULTURAL COMMODITY BUYING BEHAVIOR IN SELECTED DEVELOPING ECONOMIES A Thesis by Kimberly Renee Moore Approved as to style and content by: ( i n o Committee...

Moore, Kimberly Renee

1982-01-01T23:59:59.000Z

332

Vibration-Induced Conductivity Fluctuation Measurement for Soil Bulk Density Analysis  

E-Print Network (OSTI)

Soil bulk density affects water storage, water and nutrient movement, and plant root activity in the soil profile. Its measurement is difficult in field conditions. Vibration-induced conductivity fluctuation was investigated to quantify soil bulk density with possible field applications in the future. The AC electrical conductivity of soil was measured using a pair of blade-like electrodes while exposing the soil to periodic vibration. The blades were positioned longitudinally and transversally to the direction of the induced vibration to enable the calculation of a normalized index. The normalized index was expected to provide data independent from the vibration strength and to reduce the effect of soil salinity and water content. The experiment was conducted on natural and salinized fine sand at two moisture conditions and four bulk densities. The blade-shaped electrodes improved electrode-soil contact compared to cylindrical electrodes, and thereby, reduced measurement noise. Simulations on a simplified resistor lattice indicate that the transversal effect increases as soil bulk density decreases. Measurement of dry sand showed a negative correlation between the normalized conductivity fluctuation and soil bulk density for both longitudinal and transversal settings. The decrease in the transversal signal was smaller than expected. The wet natural and salinized soils performed very similarly as hypothesized, but their normalized VICOF response was not significant to bulk density changes.

Andrea Sz. Kishne; Cristine L. S. Morgan; Hung-Chih Chang; Laszlo B. Kish

2007-05-03T23:59:59.000Z

333

Chemical reactions at Cu/ZnS(001) and In/ZnS(001) heterojunctions: A comparison of photoelectron and S L{sub 2,3} x-ray emission spectroscopy  

SciTech Connect

Occurrence and extent of chemical reactions at Cu/ZnS(001) and In/ZnS(001) heterojunctions have been investigated by S L{sub 2,3} x-ray emission spectroscopy as well as photoelectron spectroscopy. With the formation of metal-sulfur bonds, spectral features originating from shallow metal d core levels (Zn 3d, In 4d) or valence states (Cu 3d)) may appear in the S L{sub 2,3} emission spectra. Thus the x-ray emission spectroscopy was employed to detect chemical reactions at the heterojunctions, together with conventional photoelectron spectroscopy. Considerable reactions at the Cu/ZnS(001) interface are more clearly indicated in the S L emission spectrum than in the Cu 2p{sub 3sol2} or S 2p core level spectra, whereas relatively confined reactions at the In/ZnS(001) interface can only be probed in the In 3d{sub 5sol2} core level spectra. The partial densities of states calculated for a reference CuInS{sub 2} on the basis of density functional theory agree well with features occurring in its S L{sub 2,3} emission spectrum.

Zhang, L.; Wett, D.; Schulze, D.; Szargan, R.; Nagel, M.; Peisert, H.; Chasse, T. [Institut fuer Physikalische und Theoretische Chemie, Universitaet Tuebingen, Auf der Morgenstelle 8, 72076 Tuebingen (Germany); Wilhelm-Ostwald-Institut fuer Physikalische und Theoretische Chemie, Universitaet Leipzig, Linnestrasse 2, 04103 Leipzig (Germany); Wilhelm-Ostwald-Institut fuer Physikalische und Theoretische Chemie, Universitaet Leipzig, Linnestrasse 2, 04103 Leipzig (Germany); Institut fuer Physikalische und Theoretische Chemie, Universitaet Tuebingen, Auf der Morgenstelle 8, 72076 Tuebingen (Germany)

2005-01-03T23:59:59.000Z

334

Oligo and Poly-thiophene/Zno Hybrid Nanowire Solar Cells  

E-Print Network (OSTI)

less than organic bulk heterojunction solar cells. Knowledgeof individual organic/inorganic hybrid nanowire solar cells.an organic/inorganic hybrid single nanowire solar cell. End-

Briseno, Alejandro L.

2010-01-01T23:59:59.000Z

335

Dielectric nanostructures for broadband light trapping in organic solar cells  

Science Journals Connector (OSTI)

Organic bulk heterojunction solar cells are a promising candidate for low-cost next-generation photovoltaic systems. However, carrier extraction limitations necessitate thin active...

Raman, Aaswath; Yu, Zongfu; Fan, Shanhui

2011-01-01T23:59:59.000Z

336

Fabrication and Characterization of Organic Solar Cells.  

E-Print Network (OSTI)

??Bulk heterojunction organic solar cells have recently drawn tremendous attention because of their technological advantages for actualization of large-area and cost effective fabrication. Two important… (more)

Yengel, Emre

2010-01-01T23:59:59.000Z

337

ALSNews Vol. 354  

NLE Websites -- All DOE Office Websites (Extended Search)

Heisenberg antiferromagnet The influence of molecular orientation on organic bulk heterojunction solar cells A stable three-dimensional topological Dirac semimetal Cd3As2 The...

338

Supramolecular Photosystems Based on Dye Aggregates | MIT-Harvard...  

NLE Websites -- All DOE Office Websites (Extended Search)

processes in dye vesicles,3 and photovoltaic performance of dye-based bulk heterojunction solar cells4 will be discussed. Bio: Frank Wrthner received his education in...

339

E-Print Network 3.0 - accurate band gaps Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Technological University Collection: Physics 7 Improving the efficiency of bulk heterojunction solar cells Summary: the amount of photons absorbed by the film by decreasing the...

340

Soft magnetic composites manufactured by warm co-extrusion of bulk metallic glass and steel powders  

SciTech Connect

Soft magnetic composites of Fe-based bulk metallic glass and low-alloy steel have been manufactured by warm co-extrusion of precursor powders at temperatures within the supercooled liquid region of the glass. Composites were manufactured with amorphous volume fractions of 75%, 67%, and 100%. Full consolidation of the constituent powders was observed with the bulk metallic glass remaining substantially amorphous. The composite electrical resistivity was observed to be anisotropic with a resistivity of 79 {mu}{Omega} cm measured transverse to the extrusion axis in a sample with 75% amorphous volume fraction. A 0-3 connectivity pattern with the low-resistivity steel phase embedded in a 3-dimensionally connected high-resistivity bulk metallic glass phase was observed with scanning electron microscopy. This confirms that the flow characteristics of the bulk metallic glass and the steel powders were comparable during extrusion at these temperatures. The saturation magnetization of 1.3 T was consistent with the volume weighted average of the saturation magnetization of the two phases. A relatively high quasistatic coercivity of 8 Oe was measured and is likely due to slight crystallization of the bulk metallic glass as well as domain wall pinning at prior particle boundaries. Careful control of the thermal environment during the extrusion process is required to minimize glass crystallization and achieve the desired balance of magnetic and electrical properties.

Johnson, Francis; Raber, Thomas R.; Zabala, Robert J.; Buresh, Steve J.; Tanico, Brian [GE Global Research, Ceramic and Metallurgy Technologies, One Research Circle, Niskayuna, New York 12309 (United States)

2013-05-07T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Understanding Bulk Power Reliability: The Importance of Good Data and A  

NLE Websites -- All DOE Office Websites (Extended Search)

Understanding Bulk Power Reliability: The Importance of Good Data and A Understanding Bulk Power Reliability: The Importance of Good Data and A Critical Review of Existing Sources Title Understanding Bulk Power Reliability: The Importance of Good Data and A Critical Review of Existing Sources Publication Type Report Year of Publication 2012 Authors Fisher, Emily, Joseph H. Eto, and Kristina Hamachi LaCommare Pagination 11 Date Published 01/2012 Publisher LBNL City Berkeley Keywords electricity markets and policy group, energy analysis and environmental impacts department, power system reliability, power system reliability metrics, transmission system reliability Abstract Bulk power system reliability is of critical importance to the electricity sector. Complete and accurate information on events affecting the bulk power system is essential for assessing trends and efforts to maintain or improve reliability. Yet, current sources of this information were not designed with these uses in mind. They were designed, instead, to support real-time emergency notification to industry and government first-responders. This paper reviews information currently collected by both industry and government sources for this purpose and assesses factors that might affect their usefulness in supporting the academic literature that has relied upon them to draw conclusions about the reliability of the US electric power system.

342

Summary - Demonstration Bulk Vitrification System (DBVS) for Low-Actvity Waste at Hanford  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

DBVS DBVS ETR Report Date: September 2006 ETR-3 United States Department of Energy Office of Environmental Management (DOE-EM) External Technical Review of the Demonstration Bulk Vitrification System (DBVS) for Low Activity Waste (LAW) at Hanford Why DOE-EM Did This Review The Department of Energy (DOE) is charged with the safe retrieval, treatment and disposal of 53 million gallons of Hanford radioactive waste. The Waste Treatment Plant (WTP) is being designed to treat and vitrify the High Level Waste (HLW) fraction in 20-25 years. The WTP is undersized for vitrifying the LAW fraction over the same time frame. The DOE is evaluating Bulk Vitrification as an alternative to increasing the size of the WTP LAW treatment process. Bulk vitrification is an in-container melting

343

Bulk Flows and End of the Dark Ages with the SKA  

E-Print Network (OSTI)

The early Universe is a precious probe of the birth of primordial objects, first star formation events and consequent production of photons and heavy elements. Higher-order corrections to the cosmological linear perturbation theory predicts the formation of coherent supersonic gaseous streaming motions at decoupling time. These bulk flows impact the gas cooling process and determine a cascade effect on the whole baryon evolution. By analytical estimates and N-body hydrodynamical chemistry numerical simulations including atomic and molecular evolution, gas cooling, star formation, feedback effects and metal spreading for individual species from different stellar populations according to the proper yields and lifetimes, we discuss the role of these primordial bulk flows at the end of the dark ages and their detectable impacts during the first Gyr in view of the upcoming SKA mission. Early bulk flows can inhibit molecular gas cooling capabilities, suppressing star formation, metal spreading and the abundance of ...

Maio, Umberto; Koopmans, Leon V E

2015-01-01T23:59:59.000Z

344

Sedimentation stacking diagram of binary colloidal mixtures and bulk phases in the plane of chemical potentials  

E-Print Network (OSTI)

We give a full account of a recently proposed theory that explicitly relates the bulk phase diagram of a binary colloidal mixture to its phase stacking phenomenology under gravity [Soft Matter 9, 8636 (2013)]. As we demonstrate, the full set of possible phase stacking sequences in sedimentation-diffusion equilibrium originates from straight lines (sedimentation paths) in the chemical potential representation of the bulk phase diagram. From the analysis of various standard topologies of bulk phase diagrams, we conclude that the corresponding sedimentation stacking diagrams can be very rich, even more so when finite sample height is taken into account. We apply the theory to obtain the stacking diagram of a mixture of nonadsorbing polymers and colloids. We also present a catalog of generic phase diagrams in the plane of chemical potentials in order to facilitate the practical application of our concept, which also generalizes to multi component mixtures.

Daniel de las Heras; Matthias Schmidt

2014-11-19T23:59:59.000Z

345

Towards a Unified Picture of Spin Dependent Transport in and Perpendicular Giant Magnetoresistance and Bulk Alloys  

SciTech Connect

From data on (Fe{sub 1-x}V{sub x}/Cu/Co/Cu){sub N} multilayers, we show that Fe doped with V gains a negative spin asymmetry for bulk scattering ({beta}{lt}0), which, combined with the positive asymmetry of Co, accounts for the inverse current perpendicular to the plane (CPP) giant magnetoresistance (GMR) we observe. More precisely, the competition between positive and negative asymmetries for interface and bulk scatterings in FeV leads to inverse (normal) GMR for layers thicker (thinner) than a compensation thickness. The negative {beta} of FeV is consistent with theoretical predictions and bulk alloy data. The current in the plane (CIP) GMR is not reversed, which illustrates the role of channeling in CIP. {copyright} {ital 1997} {ital The American Physical Society}

Hsu, S.; Holody, P.; Loloee, R.; Schroeder, P. [Department of Physics, Michigan State University, East Lasing, Michigan 48824 (United States)] [Department of Physics, Michigan State University, East Lasing, Michigan 48824 (United States); Barthelemy, A.; Fert, A. [UMR CNRS-Thomson CSF, LCR, 91404 Orsay (France)] [UMR CNRS-Thomson CSF, LCR, 91404 Orsay (France)

1997-03-01T23:59:59.000Z

346

Form EIA-411, "Coordinated Bulk Power Supply Program Report," | OpenEI  

Open Energy Info (EERE)

411, "Coordinated Bulk Power Supply Program Report," 411, "Coordinated Bulk Power Supply Program Report," Dataset Summary Description The Form EIA-411, "Coordinated Bulk Power Supply Program Report," collects information from the Nation's power system planners about the electricity supply, both capacity and energy, that is needed to serve current demand and for future growth. The reported data can be used to examine such issues as: the reliability of the U.S. electricity system; projections which assess future demand growth and plans for constructing new generating and transmission facilities; and consequences of unavailable or constrained capacity on usage of the existing generation base. Reliability of the electric power system covers three areas: the security of the electrical systems; the usage of

347

Bulk-edge correspondence in (2?+?1)-dimensional Abelian topological phases  

Science Journals Connector (OSTI)

The same bulk two-dimensional topological phase can have multiple distinct, fully chiral edge phases. We show that this can occur in the integer quantum Hall states at ?=8 and 12, with experimentally testable consequences. We show that this can occur in Abelian fractional quantum Hall states as well, with the simplest examples being at ?=87,1211,815,165. We give a general criterion for the existence of multiple distinct chiral edge phases for the same bulk phase and discuss experimental consequences. Edge phases correspond to lattices while bulk phases correspond to genera of lattices. Since there are typically multiple lattices in a genus, the bulk-edge correspondence is typically one-to-many; there are usually many stable fully chiral edge phases corresponding to the same bulk. We explain these correspondences using the theory of integral quadratic forms. We show that fermionic systems can have edge phases with only bosonic low-energy excitations and discuss a fermionic generalization of the relation between bulk topological spins and the central charge. The latter follows from our demonstration that every fermionic topological phase can be represented as a bosonic topological phase, together with some number of filled Landau levels. Our analysis shows that every Abelian topological phase can be decomposed into a tensor product of theories associated with prime numbers p in which every quasiparticle has a topological spin that is a pnth root of unity for some n. It also leads to a simple demonstration that all Abelian topological phases can be represented by U(1)N Chern-Simons theory parameterized by a K matrix.

Jennifer Cano; Meng Cheng; Michael Mulligan; Chetan Nayak; Eugeniu Plamadeala; Jon Yard

2014-03-14T23:59:59.000Z

348

Evaluation of a probabilistic model for bulk-power system security  

E-Print Network (OSTI)

-gower system. By use of this program with appropriate modifications the probabilistic model for any bulk-power system may be evaluated. Management and operator criteria may be derived so that the costs associated with the risk are now deterministic. 32..."UCE Nay 'f970 Major Subjeot: Statistics EVALUATION OF A PROBABILISZIC NGDEL FOR BULK-POWER SYSTEM'4 SE"URITY A Thesis by WILLIAM ALOYS SCMIDT Approved as to style and content by: Chairma of teej 7Head of Department) 7 Lember) Nay tc70 ABSTRACT...

Schmidt, William Aloys

1970-01-01T23:59:59.000Z

349

Shear bands in a bulk metallic glass after large plastic deformation  

SciTech Connect

A transmission electron microscopy investigation is conducted to trace shear bands in a Zr{sub 53}Cu{sub 18.7}Ni{sub 12}Al{sub 16.3} bulk metallic glass after experiencing 4% plastic deformation. Shear band initiation, secondary shear band interactions, mature shear band broadening and the interactions of shear bands with shear-induced nanocrystals are captured. Results suggest that the plasticity of the bulk metallic glass is enhanced by complex shear bands and their interactions which accommodate large plastic strain and prevent catastrophic shear band propagation.

Qu, D.D.; Wang, Y.B.; Liao, X.Z.; Shen, J. (Harbin); (Sydney)

2012-10-23T23:59:59.000Z

350

THE EFFECT OF SUBBANDGAP ILLUMINATION ON THE BULK RESISTIVITY OF CDZNTE  

SciTech Connect

The variation in bulk resistivity during infrared (IR) illumination above 950 nm of state-of-the-art CdZnTe (CZT) crystals grown using the traveling heating method or the modified Bridgman method is documented. The change in steady-state current with and without illumination is also evaluated. The influence of secondary phases (SP) on current?voltage (I?V) characteristics is discussed using IR transmission microscopy to determine the defect concentration within the crystal bulk. SP present within the CZT are connected to the existence of deep, IR-excitable traps within the bandgap.

Wright, J.; Washington, A.; Duff, M.; Burger, A.; Groza, M.; Buliga, V.

2013-08-13T23:59:59.000Z

351

Shubnikov-de Haas Oscillations in the Bulk Rashba Semiconductor BiTeI  

SciTech Connect

Bulk magnetoresistance quantum oscillations are observed in high quality single crystal samples of BiTeI. This compound shows an extremely large internal spin-orbit coupling, associated with the polarity of the alternating Bi, Te, and I layers perpendicular to the c-axis. The corresponding areas of the inner and outer Fermi surfaces around the A-point show good agreement with theoretical calculations, demonstrating that the intrinsic bulk Rashba-type splitting is nearly 360 meV, comparable to the largest spin-orbit coupling generated in heterostructures and at surfaces.

Bell, C.; Bahramy, M.S.; Murakawa, H.; Checkelsky, J.G.; Arita, R.; Kaneko, Y.; Onose, Y.; Nagaosa, N.; Tokura, Y.; Hwang, H.Y.

2012-07-11T23:59:59.000Z

352

Identification of Bacteria in Biofilm and Bulk Water Samples from a Nonchlorinated Model Drinking Water Distribution System: Detection of a Large Nitrite-Oxidizing Population Associated with Nitrospira spp.  

E-Print Network (OSTI)

Identification of Bacteria in Biofilm and Bulk Water SamplesNo. 12 Identification of Bacteria in Biofilm and Bulk Water

Martiny, A. C; Albrechtsen, H.-J.; Arvin, E.; Molin, S.

2005-01-01T23:59:59.000Z

353

Bulk nanocomposite magnets produced by dynamic shock compaction K. H. Chen and Z. Q. Jin  

E-Print Network (OSTI)

single-phaselike behavior, indicating effective exchange coupling between hard and soft magnetic phases. © 2004 American Institute of Physics. DOI: 10.1063/1.1760834 The figure of merit for a permanent magnet of bulk exchange-coupled nanocomposite magnets still remains a great challenge. Shock compaction employs

Wang, Zhong L.

354

Design of Bulk Railway Terminals for the Shale Oil and Gas Industry C. Tyler Dick1  

E-Print Network (OSTI)

Page 1 Design of Bulk Railway Terminals for the Shale Oil and Gas Industry C. Tyler Dick1 , P.E., M: Railway transportation is playing a key role in the development of many new shale oil and gas reserves in North America. In the rush to develop new shale oil and gas plays, sites for railway transload terminals

Barkan, Christopher P.L.

355

Bulk viscosity, particle spectra and flow in heavy-ion collisions  

E-Print Network (OSTI)

We study the effects of bulk viscosity on pT spectra and elliptic flow in heavy ion collisions. For this purpose we compute the dissipative correction df to the single particle distribution functions in leading-log QCD, and in several simplified models. We consider, in particular, the relaxation time approximation and a kinetic model for the hadron resonance gas. We implement these distribution functions in a hydrodynamic simulation of Au + Au collisions at RHIC. We find significant corrections due to bulk viscosity in hadron pT spectra and the differential elliptic flow parameter v2(pT). These corrections are dominated by viscous corrections to the distribution function. We find that the relation between df and the bulk viscosity is different in the quark gluon plasma and hadronic phases. Reliable bounds on the bulk viscosity require accurate calculations of df in a hadronic resonance gas. Based on v2 spectra at RHIC we conservatively estimate zeta/s viscosity on the pT integrated v2 are small.

Kevin Dusling; Thomas Schaefer

2011-09-23T23:59:59.000Z

356

Bulk viscosity of quark-gluon matter in a magnetic field  

SciTech Connect

On the basis of low-energy QCD theorems, the bulk viscosity {zeta}(T, Micro-Sign , H) is expressed in terms of basic thermodynamic quantities that characterizes quark-gluon matter at finite temperature and a finite baryon density in a magnetic field. Various limiting cases are considered.

Agasian, N. O., E-mail: agasian@itep.ru [Institute of Theoretical and Experimental Physics (Russian Federation)

2013-11-15T23:59:59.000Z

357

Bulk viscosity and the phase transition of the linear sigma model  

E-Print Network (OSTI)

In this work we deal with the critical behavior of the bulk viscosity in the linear sigma model (LSM) as an example of a system which can be treated by using different techniques. Starting from the Boltzmann-Uehling-Uhlenbeck equation we compute the bulk viscosity over entropy density of the LSM in the large-N limit. We search for a possible maximum of the bulk viscosity over entropy density at the critical temperature of the chiral phase transition. The information about this critical temperature, as well as the effective masses, is obtained from the effective potential. We find that the expected maximum (as a measure of the conformality loss) is absent in the large N in agreement with other models in the same limit. However, this maximum appears when, instead of the large-N limit, the Hartree approximation within the Cornwall-Jackiw-Tomboulis (CJT) formalism is used. Nevertheless, this last approach to the LSM does not give rise to the Goldstone theorem and also predicts a first order phase transition instead of the expected second order one. Therefore both, the large-N limit and the CJT-Hartree approximations, should be considered as complementary for the study of the critical behavior of the bulk viscosity in the LSM.

Antonio Dobado; Juan M. Torres-Rincon

2012-06-06T23:59:59.000Z

358

Surface chemistry of bulk nanocrystalline pure iron and electrochemistry study in gas-flow physiological saline  

E-Print Network (OSTI)

,9 was about an early failure owing to insufficient strength caused by hydrogen embrittlement or agingSurface chemistry of bulk nanocrystalline pure iron and electrochemistry study in gas. The contact angle test with water and glycerol droplets shows a smaller angle (though >90 ) of NC-Fe than

Zheng, Yufeng

359

APPLIED HTS BULKS AND WIRES TO ROTATING MACHINES FOR MARINE PROPULSION  

Science Journals Connector (OSTI)

High?temperature superconductors allow a compact and efficient way to provide high?torque density to rotating machines with excellent operation. A field pole providing flux density of more than 1.5 T around the armature was initially designed for an axial?gap type with the flux parallel to the rotor axis. Melt?growth Gd?123 bulks as well as Bi?2223 wire windings have been successfully assembled on the rotor disk. No iron core was used though being an auxiliary flux control found in most HTS motors. Both bulk and wire types have realized a practical motor operation within a limited output range. For bulks a 15 kW 720 rpm synchronous motor was designed and tested in the group of TUMSAT Kitano Seiki and University of Fukui. A bulk field pole was cooled down by liquid nitrogen and was magnetized in the motor. To enhance the output power to more than 30 kW we developed a thermosyphon system using condensed neon. Another field pole with HTS wire for large?scale marine propulsion is also discussed on a 100 kW 230 rpm tested machine. A closed?cycle condensed neon associated with thermal insulation is also reported.

M. Miki; B. Felder; Y. Kimura; K. Tsuzuki; R. Taguchi; Y. Shiliang; Y. Xu; T. Ida; M. Izumi

2010-01-01T23:59:59.000Z

360

CORD: Energy-efficient Reliable Bulk Data Dissemination in Sensor Networks  

E-Print Network (OSTI)

and outdoor sensor network testbed and via extensive simulations. Our results show that in comparisonCORD: Energy-efficient Reliable Bulk Data Dissemination in Sensor Networks Leijun Huang Sanjeev is to minimize energy consumption. To achieve its goals CORD employs a two phase approach in which the object

Setia, Sanjeev

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Processing and optimization of bulk La??[x]Ca[x]MnO?[±][delta  

E-Print Network (OSTI)

The following explores the first systematic research conducted at Texas A&M University studying preparation techniques of the bulk La1-x-Cax-Mn-O3"d colossal magnetoresistance (CMR) family. Three sample sets of La1-x-Cax-Mn-O3"d were fabricated...

Ybarra, Ignacio

2013-02-22T23:59:59.000Z

362

The efficiency of bulk and fine/flavor cocoa markets: the case of Trinidad and Tobago  

E-Print Network (OSTI)

Time-series methods are used to study the dynamics of bulk and fine/flavor (FF) cocoa bean prices among the markets. The study focuses on establishing where cocoa bean prices are discovered and whether FF cocoa price for Trinidad and Tobago (T...

Kalloo, Margaret Surujdai

2002-01-01T23:59:59.000Z

363

Bulk-Flow analysis for force and moment coefficients of a shrouded centrifugal compressor impeller  

E-Print Network (OSTI)

An analysis is developed for a compressible bulk-flow model of the leakage path between a centrifugal compressor's impeller shroud and housing along the front and back side of the impeller. This is an extension of analysis performed first by Childs...

Gupta, Manoj Kumar

2005-08-29T23:59:59.000Z

364

The transfer between electron bulk kinetic energy and thermal energy in collisionless magnetic reconnection  

SciTech Connect

By performing two-dimensional particle-in-cell simulations, we investigate the transfer between electron bulk kinetic and electron thermal energy in collisionless magnetic reconnection. In the vicinity of the X line, the electron bulk kinetic energy density is much larger than the electron thermal energy density. The evolution of the electron bulk kinetic energy is mainly determined by the work done by the electric field force and electron pressure gradient force. The work done by the electron gradient pressure force in the vicinity of the X line is changed to the electron enthalpy flux. In the magnetic island, the electron enthalpy flux is transferred to the electron thermal energy due to the compressibility of the plasma in the magnetic island. The compression of the plasma in the magnetic island is the consequence of the electromagnetic force acting on the plasma as the magnetic field lines release their tension after being reconnected. Therefore, we can observe that in the magnetic island the electron thermal energy density is much larger than the electron bulk kinetic energy density.

Lu, San; Lu, Quanming; Huang, Can; Wang, Shui [CAS Key Lab of Basic Plasma Physics, University of Science and Technology of China, Hefei 230026 (China)] [CAS Key Lab of Basic Plasma Physics, University of Science and Technology of China, Hefei 230026 (China)

2013-06-15T23:59:59.000Z

365

Intercomparison of Bulk Microphysics Schemes in Model Simulations of Polar Lows  

Science Journals Connector (OSTI)

Four spiraliform polar lows, two over the Sea of Japan and two over the Nordic Seas, were simulated with the Weather Research and Forecasting (WRF) model. Five mixed-phase bulk microphysics schemes (BMS) provided with WRF were run respectively in ...

Longtao Wu; Grant W. Petty

2010-06-01T23:59:59.000Z

366

Bulk ACCVD Generation of SWNTs with Narrow Chirality Distribution Shigeo Maruyama1)  

E-Print Network (OSTI)

Bulk ACCVD Generation of SWNTs with Narrow Chirality Distribution Shigeo Maruyama1) , Yuhei-1, Sonoyama 1-chome, Otsu, Shiga 520-8558, Japan By scaling up the alcohol CCVD (ACCVD) generation technique to determine the chirality distribution of SWNTs, dispersed and centrifuged SWNTs in NaDDBS/D2O was examined

Maruyama, Shigeo

367

BULK VITRIFICATION TECHNOLOGY FOR THE TREATMENT AND IMMOBILIZATION OF LOW-ACTIVITY WASTE  

SciTech Connect

This report is one of four reports written to provide background information regarding immobilization technologies under consideration for supplemental immobilization of Hanford's low-activity waste. This paper is intended to provide the reader with general understanding of Bulk Vitrification and how it might be applied to immobilization of Hanford's low-activity waste.

ARD KE

2011-04-11T23:59:59.000Z

368

Penetration of ac magnetic field into bulk high-temperature superconductors: Experiment and simulation  

E-Print Network (OSTI)

Penetration of ac magnetic field into bulk high-temperature superconductors: Experiment from these models for high-temperature superconductors are observed at the op- eration in ac fields condi- tions is very important for correct modeling magnetic prop- erties of high-temperature

Paperno, Eugene

369

Bulk Electricity Generating Technologies This appendix describes the technical characteristics and cost and performance  

E-Print Network (OSTI)

and technologies expected to be available to meet bulk power generation needs during the period of the power plan PRICES The price forecasts for coal, fuel oil and natural gas are described in Appendix B. COAL-FIRED STEAM-ELECTRIC PLANTS Coal-fired steam-electric power plants are a mature technology, in use for over

370

Colloidal electroconvection in a thin horizontal cell: II. Bulk electroconvection of water during parallelplate electrolysis  

E-Print Network (OSTI)

Colloidal electroconvection in a thin horizontal cell: II. Bulk electroconvection of water during parallel­plate electrolysis Yilong Han Department of Physics and Astronomy, University of Pennsylvania 209, they appear to result from an underlying electroconvective instability during electrolysis in the parallel

Grier, David

371

Colloidal electroconvection in a thin horizontal cell: II. Bulk electroconvection of water during parallelplate electrolysis  

E-Print Network (OSTI)

Colloidal electroconvection in a thin horizontal cell: II. Bulk electroconvection of water during parallel­plate electrolysis Yilong Han Department of Physics and Astronomy, University of Pennsylvania 209 electrolysis in the parallel plate geometry. This contrasts with recent theoretical results suggesting

Grier, David

372

New Pinning Centres in YBCO Bulk Supreconductors with Depleted Uranium Addition  

Science Journals Connector (OSTI)

The microstructural characterisation of single-grain YBa2Cu3O7/Y2BaCuO5 (Y123/ Y211) bulk superconductors with complex alloying based on U and Al was performed by optical and scanning electron microscope with EDA...

K. Zmorayová; M. Šef?íková; P. Diko; N.H. Babu…

2004-12-01T23:59:59.000Z

373

Biomass-Derived Platform Chemicals: Thermodynamic Studies on the Conversion of 5-Hydroxymethylfurfural into Bulk Intermediates  

Science Journals Connector (OSTI)

Biomass-Derived Platform Chemicals: Thermodynamic Studies on the Conversion of 5-Hydroxymethylfurfural into Bulk Intermediates ... This work was undertaken to obtain new thermochemical data for 5-hydroxymethylfurfural (HMF) and parent compounds. ... Cellulose and other carbohydrates (e.g., glucose and fructose) can be converted into furanic biofuels via 5-hydroxymethylfurfural (HMF), using relatively simple processes such as condensation and hydrogenation reactions. ...

Sergey P. Verevkin; Vladimir N. Emel’yanenko; Elena N. Stepurko; Richardas V. Ralys; Dmitry H. Zaitsau; Annegret Stark

2009-09-11T23:59:59.000Z

374

Stress-corrosion fatiguecrack growth in a Zr-based bulk amorphous metal  

E-Print Network (OSTI)

of the work was to determine the rate and mechanisms of subcritical crack growth in this metallic glassStress-corrosion fatigue­crack growth in a Zr-based bulk amorphous metal V. Schroeder 1 , R. Results indicate that crack growth in aqueous solution in this alloy is driven by a stress-assisted anodic

Ritchie, Robert

375

Adaptation and policy-based resource allocation for efficient bulk data transfers in high performance computing environments  

Science Journals Connector (OSTI)

Many science applications increasingly make use of data-intensive methods that require bulk data movement such as staging of large datasets in preparation for analysis on shared computational resources, remote access to large data sets, and data dissemination. ... Keywords: bulk data transfer, performance-based adaptation, policy-based resource allocation, resource constrained, throughput

Ann L. Chervenak, Alex Sim, Junmin Gu, Robert E. Schuler, Nandan Hirpathak

2014-11-01T23:59:59.000Z

376

Abstract--Temperature, current density and magnetic field distributions in YBCO bulk superconductor during a pulsed-field  

E-Print Network (OSTI)

-- bulk YBaCuO, stored magnetic energy, thermal coupling, magnetization, modelling. I. INTRODUCTION HE as cryo-permanent magnets [1], [2]. To magnetize the HTS, pulsed field magnetization (PFM) process1 Abstract-- Temperature, current density and magnetic field distributions in YBCO bulk

Paris-Sud XI, Université de

377

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic glasses  

E-Print Network (OSTI)

Correlation between corrosion performance and surface wettability in ZrTiCuNiBe bulk metallic June 2010 The corrosion properties of two Zr-based bulk metallic glass, Zr41Ti14Cu12Ni10Be23 LM1 and Zr potential, LM1b showed superior corrosion resistance to LM1. Under identical sample preparation and testing

Zheng, Yufeng

378

Water in a Crowd In many situations, form biology to geology, water occurs not as the pure bulk  

E-Print Network (OSTI)

Water in a Crowd In many situations, form biology to geology, water occurs not as the pure bulk species, and interacting with large organic molecules. In such situations, water does not behave in the same manner as it does in the pure bulk liquid. Water dynamics are fundamental to many processes

Fayer, Michael D.

379

Photocatalytic Activity of Bulk TiO{sub 2} Anatase and Rutile Single Crystals Using Infrared Absorption Spectroscopy  

SciTech Connect

A systematic study on the photocatalytic activity of well-defined, macroscopic bulk single-crystal TiO{sub 2} anatase and rutile samples has been carried out, which allows us to link photoreactions at surfaces of well-defined oxide semiconductors to an important bulk property with regard to photochemistry, the life time of e-h pairs generated in the bulk of the oxides by photon absorption. The anatase (101) surface shows a substantially higher activity, by an order of magnitude, for CO photo-oxidation to CO{sub 2} than the rutile (110) surface. This surprisingly large difference in activity tracks the bulk e-h pair lifetime difference for the two TiO{sub 2} modifications as determined by contactless transient photoconductance measurements on the corresponding bulk materials.

Xu Mingchun; Gao Youkun [Department of Physical Chemistry I, Ruhr-Universitaet Bochum, 44780 (Germany); Moreno, Elias Martinez; Kunst, Marinus [Hahn-Meitner-Institut, Glienicker Strasse 100, D-1000 Berlin 39 (Germany); Muhler, Martin [Laboratory of Industrial Chemistry, Ruhr-Universitaet Bochum, 44780 (Germany); Wang Yuemin [Department of Physical Chemistry I, Ruhr-Universitaet Bochum, 44780 (Germany); Laboratory of Industrial Chemistry, Ruhr-Universitaet Bochum, 44780 (Germany); Idriss, Hicham [Department of Chemistry, University of Aberdeen and School of Engineering, Robert Gordon University, AB24 3EU Aberdeen, Scotland (United Kingdom); Woell, Christof [Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe (Germany)

2011-04-01T23:59:59.000Z

380

How do I push or pull bulk wiki pages from OpenEI mediawiki instance? |  

Open Energy Info (EERE)

How do I push or pull bulk wiki pages from OpenEI mediawiki instance? How do I push or pull bulk wiki pages from OpenEI mediawiki instance? Home > Groups > Developer Submitted by Rmckeel on 10 October, 2012 - 10:00 1 answer Points: 0 Jay did a great write-up with code samples on this! Please check out http://en.openei.org/community/blog/openei-downloadupload-automation-scripts Rmckeel on 10 October, 2012 - 10:00 Groups Menu You must login in order to post into this group. Recent content Timo,My apologies for the ... Browse by region (RaphaelSVGMap) The utility rate database version 1 API is now deprecated Probably the best reference on... New Robust References! more Group members (18) Managers: Rmckeel Recent members: Sangduen Timo.Kouwenhoven Jwkropf KingJahfy Graham7781 Ianjkalin Autumn1 Mvdv Sprzesmi Satish Cdonnelly Wzeng Twong Jayhuggins

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Renewable Electricity Futures Study. Volume 4: Bulk Electric Power Systems: Operations and Transmission Planning  

NLE Websites -- All DOE Office Websites (Extended Search)

Bulk Electric Power Systems: Bulk Electric Power Systems: Operations and Transmission Planning Volume 4 of 4 Volume 2 PDF Volume 3 PDF Volume 1 PDF Volume 4 PDF NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. Renewable Electricity Futures Study Edited By Hand, M.M. National Renewable Energy Laboratory Baldwin, S. U.S. Department of Energy DeMeo, E. Renewable Energy Consulting Services, Inc. Reilly, J.M. Massachusetts Institute of Technology Mai, T. National Renewable Energy Laboratory Arent, D. Joint Institute for Strategic Energy Analysis Porro, G. National Renewable Energy Laboratory Meshek, M. National Renewable Energy Laboratory Sandor, D. National Renewable

382

Synthesis and characterization of bulk and coatings of hydroxyapatite using methanol precursor  

SciTech Connect

Hydroxyapatite, an important bioceramic was synthesized in the bulk form and developed as a coating by a sol-gel route using alcoholic precursor. The bioactive coating was developed on bio-inert {alpha}-alumina and yttria stabilized zirconia substrates. The apatite phase began to form after the heat treatment of the precursor at 500 deg. C for 10 min. The complete crystallization of the apatite was obtained at 800 deg. C heat treatment for 10 min. The phase composition of the bulk and the coatings was identified by FT-IR spectroscopic and powder X-ray diffraction (XRD) techniques. Surface morphology was determined by scanning electron microscopy. The study indicates different surface textures for the powder and for the coatings on {alpha}-alumina and yttria stabilized zirconia substrates.

Khongwar, Jasper K. [Chemistry Division, School of Science and Humanities, Vellore Institute of Technology University, Vellore 632014, Tamil Nadu (India); Kannan, K.R. [SSCU, Indian Institute of Science, Bangalore 560012 (India); Buvaneswari, G. [Chemistry Division, School of Science and Humanities, Vellore Institute of Technology University, Vellore 632014, Tamil Nadu (India)], E-mail: gopalbhu@yahoo.com

2008-02-05T23:59:59.000Z

383

Sonically produced heat in a fluid with bulk viscosity and shear viscosity  

Science Journals Connector (OSTI)

In a viscous fluid sound produces heat in a spatial pattern which in general depends on the relative magnitudes of the shear viscosity coefficient ? and the bulk viscosity coefficient B’. It is well known that when the particle velocity components u i relative to Cartesian coordinates x i are given for an arbitrary sound field or any field of flow the volume rate of heat production q v can be determined from a dissipation function in the form B’T 1+?T 2. Here T 1 and T 2 are quadratic functions involving derivatives of the type ?u i /?x j . In this paper examples are discussed for continuous monofrequency sound fields including crossed plane waves as well as focused and unfocused fields. In these examples spatial distributions of the time?averaged quantity ?q v ? for media in which the loss mechanism is primarily bulk viscosity are compared to those for media in which shear viscosity dominates.

Wesley L. Nyborg

1986-01-01T23:59:59.000Z

384

Spinodal decomposition and dislocation lines in thin films and bulk materials  

Science Journals Connector (OSTI)

Phase separation of alloys around dislocation lines due to edge- and screw-type dislocations is studied using a continuum model. The dependence of the lattice constant, bulk modulus, and shear modulus on composition is shown to determine the distribution of the alloy components in the stress fields of the dislocations. Numerical simulation results are also presented for single dislocation lines, arrays of dislocations, and random distributions of dislocations in bulk mixtures in a context relevant to quench-work-age thermomechanical treatment of alloys. The effects of dislocations on the phase separation occurring at the surface of growing films is also discussed, showing that misfit dislocations can create a compositionally patterned layer. The equilibrium position of misfit dislocations is also calculated for compositionally modulated overlayers, and it is shown that the critical thickness for the introduction of dislocations is reduced due to the composition modulation.

François Léonard and Rashmi C. Desai

1998-10-01T23:59:59.000Z

385

Intense femtosecond photoexcitation of bulk and monolayer MoS2  

E-Print Network (OSTI)

The effect of femtosecond laser irradiation on bulk and single-layer MoS2 on silicon oxide is studied. Optical, Field Emission Scanning Electron Microscopy (FESEM) and Raman microscopies were used to quantify the damage. The intensity of A1g and E2g1 vibrational modes was recorded as a function of the number of irradiation pulses. The observed behavior was attributed to laser-induced bond breaking and subsequent atoms removal due to electronic excitations. The single-pulse optical damage threshold was determined for the monolayer and bulk under 800nm and 1030nm pulsed laser irradiation and the role of two-photon versus one photon absorption effects is discussed.

Paradisanos, I; Fotakis, C; Kioseoglou, G; Stratakis, E

2015-01-01T23:59:59.000Z

386

Hot-carrier cooling in GaAs: Quantum wells versus bulk  

Science Journals Connector (OSTI)

Hot-electron cooling dynamics in photoexcited bulk and quantum-well GaAs structures were determined using time-correlated single-photon counting of photoluminescence (PL) decay. Hot-electron cooling curves were generated from analyses of the time-resolved PL spectra. The time constant characterizing the hot-electron energy-loss rate, ?avg, was then determined, taking into account electron degeneracy and the time dependence of the quasi-Fermi-level. This analysis was also applied to earlier data obtained by Pelouch et al. with the same samples, but based on PL up-conversion experiments with carrier density) to bulk GaAs when this density is above a critical value. This critical density was found to range from high 1017 to low 1018 cm-3, depending upon the experimental technique; at the highest carrier densities, values of ?avg for quantum wells were found to be many hundreds of ps.

Y. Rosenwaks; M. C. Hanna; D. H. Levi; D. M. Szmyd; R. K. Ahrenkiel; A. J. Nozik

1993-11-15T23:59:59.000Z

387

Report on Analysis of Forest Floor Bulk Density and Depth at the Savannah River Site.  

SciTech Connect

The forest floor data from the Savannah River Site consists of two layers, the litter layer and the duff layer. The purpose for the study was to determine bulk density conversion factors to convert litter and duff depth values in inches to forest floor fuel values in tons per acre. The primary objective was to collect litter and duff samples to adequately characterize forest floor depth and bulk density for combinations of 4 common forest types (loblolly/slash pine, longleaf pine, pine and hardwood mix, upland hardwood), 3 age classes (5-20, 20-40, 40+ years old) and 3 categories of burning history (0-3, 3-10, 10+ years since last burn).

Bernard R. Parresol

2005-10-01T23:59:59.000Z

388

Deformation behavior in bulk nanocrystalline-ultrafine aluminum :in situ evidence of plastic strain recovery.  

SciTech Connect

The plastic deformation behavior of bulk nanocrystalline-ultrafine Al was investigated under in situ compressive loading using high-energy synchrotron X-ray diffraction. After one loading-unloading cycle, to 2% strain, we find reversible peak broadening within the nanocrystalline grain volume and tensile residual stress (80 MPa) within the ultrafine grain volume. Upon unloading, we detect recovery of 12% of the plastic strain, and this recovery increases up to 28% at even higher applied deformations to 4%.

Lonardelli, I.; Almer, J.; Ischia, G; Menapace, C.; Molinari, A.; Univ. of Trento

2009-04-01T23:59:59.000Z

389

Effect of Viscosity on the Microformability of Bulk Amorphous Alloy in Supercooled Liquid Region  

SciTech Connect

Previously published results have shown that viscosity greatly influences on the deformation behavior of the bulk amorphous alloy in supercooled liquid region during microforming process. And viscosity is proved to be a component of the evaluation index which indicating microformability. Based on the fluid flow theory and assumptions, bulk amorphous alloy can be regarded as the viscous materials with a certain viscosity. It is helpful to understand how the viscosity plays an important role in viscous materials with various viscosities by numerical simulation on the process. Analysis is carried out by linear state equation in FEM with other three materials, water, lubricant oil and polymer melt, whose viscosities are different obviously. The depths of the materials flow into the U-shaped groove during the microimprinting process are compared in this paper. The result shows that the deformation is quite different when surface tension effect is not considered in the case. With the lowest viscosity, water can reach the bottom of micro groove in a very short time. Lubricant oil and polymer melt slower than it. Moreover bulk amorphous alloys in supercooled liquid state just flow into the groove slightly. Among the alloys of different systems including Pd-, Mg- and Zr-based alloy, Pd-based alloy ranks largest in the depth. Mg-based alloy is the second. And Zr-based alloy is the third. Further more the rank order of the viscosities of the alloys is Pd-, Mg- and Zr-based. It agrees well with the results of calculation. Therefore viscosity plays an important role in the microforming of the bulk amorphous alloy in the supercooled liquid state.

Cheng Ming; Zhang Shihong; Wang Ruixue [Institute of Metal Research, Chinese Academy of Sciences Shenyang 110016, Liaoning Province (China)

2010-06-15T23:59:59.000Z

390

Magnetic property of a staggered-array undulator using a bulk high-temperature superconductor  

Science Journals Connector (OSTI)

The magnetic field of a staggered-array undulator using a bulk high-temperature superconductor is calculated by analytical and numerical methods. Analytical formulas for the undulator field and the solenoid field required to generate the undulator field are derived from a simple two-dimensional model. The analytical calculation shows the degree of dependence of these fields on the undulator parameters, the generation of a high undulator field proportional to the critical current density of the bulk superconductor, and the good tunability of the undulator field over a wide range of values. The numerical calculation is performed in a three-dimensional geometry by two methods: the center field and energy minimization methods. The latter treats the current distribution inside the bulk, whereas the former neglects it as a natural extension of the analytical model. The calculation also reveals the dependence of the fields on the undulator parameters arising from the current distribution. From the comparison with experimental results, we find that the latter method reproduces the experimental results well, which indicates the importance of the current distribution inside the bulk. Therefore, we derive a semiempirical formula for the required solenoid field by modifying the analytical formula using the numerical results so as to include the effect of the current distribution. The semiempirical formula reproduces the numerical result with an error of 3%. Finally, we estimate the magnetic performance of the undulator as an example of using the formulas and values presented in this paper. The estimation shows that an undulator field twice as large as that of the present in-vacuum undulator but with an equal period and gap can be obtained at a temperature of approximately 20–40 K, and that deflection parameters (K values) of 1 and 2 can be achieved with periods of 5 and 10 mm at approximately 4–20 K.

Ryota Kinjo; Kenta Mishima; Yong-Woon Choi; Mohamed Omer; Kyohei Yoshida; Hani Negm; Konstantin Torgasin; Marie Shibata; Kyohei Shimahashi; Hidekazu Imon; Kensuke Okumura; Motoharu Inukai; Heishun Zen; Toshiteru Kii; Kai Masuda; Kazunobu Nagasaki; Hideaki Ohgaki

2014-02-26T23:59:59.000Z

391

Surface Science Letters Bulk-defect dependent adsorption on a metal oxide surface  

E-Print Network (OSTI)

-6028(01)01067-6 #12;Titanium dioxide is a wide-band gap semicon- ductor (Egap 3 eV) that can easily be reducedSurface Science Letters Bulk-defect dependent adsorption on a metal oxide surface: S/TiO2(1 1 0) E Abstract The adsorption of molecular sulfur on TiO2(1 1 0)(1 Ã? 1) has been studied with scanning tunneling

Diebold, Ulrike

392

Oxygen impurity and microalloying effect in a Zr-based bulk metallic glass alloy  

E-Print Network (OSTI)

Oxygen impurity and microalloying effect in a Zr-based bulk metallic glass alloy C.T. Liu*, M composition Zr­10 at.%Al­5% Ti­17.9% Cu­14.6% Ni (BAM-11) was used to study the effects of oxygen impurities and microalloying on the microstructure and mechanical properties. Oxygen impurity at a level of 3000 appm

Pennycook, Steve

393

Impact of Improved Solar Forecasts on Bulk Power System Operations in ISO-NE (Presentation)  

SciTech Connect

The diurnal nature of solar power is made uncertain by variable cloud cover and the influence of atmospheric conditions on irradiance scattering processes. Its forecasting has become increasingly important to the unit commitment and dispatch process for efficient scheduling of generators in power system operations. This presentation is an overview of a study that examines the value of improved solar forecasts on Bulk Power System Operations.

Brancucci Martinez-Anido, C.; Florita, A.; Hodge, B.M.

2014-11-01T23:59:59.000Z

394

Effect of nanoclay loading on the thermal decomposition of nanoclay polyurethane elastomers obtained by bulk polymerization  

Science Journals Connector (OSTI)

Thermoplastic urethane (TPU) nanocomposite was prepared successfully by dispersion at high shear stress of the nanoclay in polyol and further bulk polymerization. Our results from DSC studies showed an increase in decomposition temperature when nanoclay was loaded at 3,5% on elastomeric PU made from TDI, PTMEG and BDO, while not when nanoclay content was lower (1,5%). The exotherms at 370-375°C could be adscribed to the decomposition of the hard segments according to previous work.

Javier Quagliano; Javier Bocchio

2014-01-01T23:59:59.000Z

395

Probing bulk viscous matter-dominated models with gamma-ray bursts  

SciTech Connect

In this paper we extend the range of consistency of a constant bulk viscosity model to redshifts up to z ? 8.1. In this model the dark sector of the cosmic substratum is a viscous fluid with pressure p = ???, where ? is the fluid-expansion scalar and ? is the coefficient of bulk viscosity. Using the sample of 59 high-redshift GRBs reported by Wei (2010), we calibrate GRBs at low redshifts with the Union 2 sample of SNe Ia, thus avoiding the circularity problem. Testing the constant bulk viscosity model with GRBs we found the best fit for the viscosity parameter ?-tilde in the range 0 < ?-tilde < 3, so that it be consistent with previous probes; we also determined the deceleration parameter q{sub 0} and the redshift of transition to accelerated expansion. Besides, we present an updated analysis of the model with CMB5-year data and CMB7-year data, as well as with the baryon acoustic peak BAO. From the statistics with CMB it turns out that the model does not describe in a feasible way to such a far epoch of recombination of the universe, but is in very good concordance for epochs as far as z ? 8.1 till present.

Montiel, A.; Bretón, N., E-mail: amontiel@fis.cinvestav.mx, E-mail: nora@fis.cinvestav.mx [Dpto. de Física, Centro de Investigación y de Estudios Avanzados del I. P. N., Av. IPN 2508, D.F. (Mexico)

2011-08-01T23:59:59.000Z

396

Probing bulk viscous matter-dominated models with Gamma-ray bursts  

E-Print Network (OSTI)

In this paper we extend the range of consistency of a constant bulk viscosity model to redshifts up to $z\\sim 8.1$. In this model the dark sector of the cosmic substratum is a viscous fluid with pressure $p= -\\zeta \\theta$, where $\\theta$ is the fluid-expansion scalar and $\\zeta$ is the coefficient of bulk viscosity. Using the sample of 59 high-redshift GRBs reported by Wei (2010), we calibrate GRBs at low redshifts with the Union 2 sample of SNe Ia, avoiding then the circularity problem. Testing the constant bulk viscosity model with GRBs we found the best fit for the viscosity parameter $\\tilde{\\zeta}$ in the range $0<\\tilde{\\zeta}<3$, being so consistent with previous probes; we also determined the deceleration parameter $q_0$ and the redshift of transition to accelerated expansion. Besides we present an updated analysis of the model with CMB5-year data and CMB7-year data, as well as with the baryon acoustic peak BAO. From the statistics with CMB it turns out that the model does not describe in a feasible way the far far epoch of recombination of the universe, but is in very good concordance for epochs as far as $z\\sim 8.1$ till present.

A. Montiel; N. Bretón

2011-07-01T23:59:59.000Z

397

The effects of particle dynamics on the calculation of bulk stress in granular media  

Science Journals Connector (OSTI)

Abstract Expressions for bulk stress within a granular material in a dynamic setting are reviewed and explicitly derived for assemblies of three dimensional arbitrary shaped particles. By employing classical continuum and rigid body mechanics, the mean stress tensor for a single particle is separated into three distinct components; the familiar Love–Webber formula describing the direct effect of contacts, a component due to the net unbalanced moment arising from contact and a symmetric term due to the centripetal acceleration of material within the particle. A case is made that the latter term be ignored without exception when determining bulk stress within an assembly of particles. In the absence of this centripetal term an important observation is made regarding the nature of the symmetry in the stress tensor for certain types of particles; in the case of particles with cubic symmetry, the effects of dynamics on the bulk stress in an assembly is captured by an entirely skew-symmetric tensor. In this situation, it is recognised that the symmetric part of the Love–Webber formula is all that is required for defining the mean stress tensor within an assembly – regardless of the dynamics of the system.

A.L. Smith; C.M. Wensrich

2014-01-01T23:59:59.000Z

398

Effect of bulk viscosity in low density, hypersonic blunt body flows  

SciTech Connect

A computational fluids dynamics scheme is presented to solve the unsteady Thin-Layer Navier-Stokes (TLNS) equations over a blunt body at high altitude, high Mach number atmospheric reentry flow conditions. This continuum approach is directed to low density hypersonic flows by accounting for non-zero bulk viscosity effects in near frozen flow conditions. The TLNS equations are solved over an axisymmetric body at zero incidence relative to the free stream. The time dependent axisymmetric governing equations are transformed into a computational plane, then cast into weak conservative form and solved using a first-order fully implicit scheme in time with second-order flux vector splitting for spatial derivatives. The physical domain is defined over representative sphere and sphere/cone geometries using a body-fitted clustered algebraic grid within a fixed domain (i.e., shock capturing). At the present time, nonequilibrium thermo-chemistry effects are not modeled. Catalytic wall, ionization and radiation effects are also excluded from the current analysis. However, the significant difference from previous studies is the inclusion of the capability to model non-zero bulk viscosity effects. The importance of bulk viscosity is reviewed and blunt body flow field solutions are presented to illustrate the potential contribution of this phenomena at high altitude hypersonic conditions. The current technique is compared with experimental data and other approximate continuum solutions. A variety of test cases are also presented for a wide range of free stream Mach conditions. 18 refs., 42 figs.

Rutledge, W.H. (Sandia National Labs., Albuquerque, NM (USA)); Hoffmann, K.A. (Texas Univ., Austin, TX (USA))

1991-01-01T23:59:59.000Z

399

On the equation of state of a flat FRW model filled with a bulk viscous fluid  

E-Print Network (OSTI)

In this paper, we study the equation of state admissible for a flat FRW models filled with a bulk viscous fluid by using the Lie group method. It is founded that the model admits scaling symmetries iff the bulk viscous parameter $\\gamma =1/2$. In this case, it is found that the main quantities follow a power law solution and in particular the bulk viscous pressure $\\Pi $ has the same order of magnitude as the energy density $\\rho ,$ in such a way that it is possible to formulate the equation of state $\\Pi =\\varkappa \\rho ,$ where $\\varkappa \\in \\mathbb{R}^{-}$ (i.e. is a negative numerical constant)$.$ If we assume such relationship we find again that the model is scale invariant iff $\\gamma =1/2.$ We conclude that the model accepts a scaling symmetry iff $\\gamma =1/2$ and that for this value of the viscous parameter, $\\Pi =\\varkappa \\rho ,$ but the hypothesis $\\Pi =\\varkappa \\rho $ does not imply $\\gamma =1/2,$ and that the model is scale invariant.

J. A. Belinchón

2004-12-19T23:59:59.000Z

400

ENVIRONMENTAL SAMPLING USING LOCATION SPECIFIC AIR MONITORING IN BULK HANDLING FACILITIES  

SciTech Connect

Since the introduction of safeguards strengthening measures approved by the International Atomic Energy Agency (IAEA) Board of Governors (1992-1997), international nuclear safeguards inspectors have been able to utilize environmental sampling (ES) (e.g. deposited particulates, air, water, vegetation, sediments, soil and biota) in their safeguarding approaches at bulk uranium/plutonium handling facilities. Enhancements of environmental sampling techniques used by the IAEA in drawing conclusions concerning the absence of undeclared nuclear materials or activities will soon be able to take advantage of a recent step change improvement in the gathering and analysis of air samples at these facilities. Location specific air monitoring feasibility tests have been performed with excellent results in determining attribute and isotopic composition of chemical elements present in an actual test-bed sample. Isotopic analysis of collected particles from an Aerosol Contaminant Extractor (ACE) collection, was performed with the standard bulk sampling protocol used throughout the IAEA network of analytical laboratories (NWAL). The results yielded bulk isotopic values expected for the operations. Advanced designs of air monitoring instruments such as the ACE may be used in gas centrifuge enrichment plants (GCEP) to detect the production of highly enriched uranium (HEU) or enrichments not declared by a State. Researchers at Savannah River National Laboratory in collaboration with Oak Ridge National Laboratory are developing the next generation of ES equipment for air grab and constant samples that could become an important addition to the international nuclear safeguards inspector's toolkit. Location specific air monitoring to be used to establish a baseline environmental signature of a particular facility employed for comparison of consistencies in declared operations will be described in this paper. Implementation of air monitoring will be contrasted against the use of smear ES when used during unannounced inspections, design information verification, limited frequency unannounced access, and complementary access visits at bulk handling facilities. Analysis of technical features required for tamper indication and resistance will demonstrate the viability of successful application of the system in taking ES within a bulk handling location. Further exploration of putting this technology into practice is planned to include mapping uranium enrichment facilities for the identification of optimal for installation of air monitoring devices.

Sexton, L.; Hanks, D.; Degange, J.; Brant, H.; Hall, G.; Cable-Dunlap, P.; Anderson, B.

2011-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

The Effect of Inaccuracies in Weather-Ship Data on Bulk-Derived Estimates of Flux, Stability and Sea-Surface Roughness  

Science Journals Connector (OSTI)

An analytical error analysis (or sensitivity study) is performed for the momentum, heat, and humidity flux estimates made from weather-ship observations by using the bulk flux method. Bulk-derived stability and roughness errors are also examined. ...

Theodore V. Blanc

1986-03-01T23:59:59.000Z

402

Precision in-plane hand assembly of bulk microfabricated components for high-voltage MEMS arrays applications  

E-Print Network (OSTI)

This paper reports the design and experimental validation of an in-plane assembly method for centimeter-scale bulk-microfabricated components. The method uses mesoscaled deep-reactive-ion-etching (DRIE)-patterned cantilevers ...

Akinwande, Akintunde Ibitayo

403

Power-law rheology in the bulk and at the interface: quasi-properties and fractional constitutive equations  

E-Print Network (OSTI)

Consumer products, such as foods, contain numerous polymeric and particulate additives that play critical roles in maintaining their stability, quality and function. The resulting materials exhibit complex bulk and interfacial ...

Jaishankar, Aditya

404

Bulk chemicals from biomass Jacco van Haveren, Agrotechnology and Food Innovations B.V., Wageningen, The Netherlands  

E-Print Network (OSTI)

41 Review Bulk chemicals from biomass Jacco van Haveren, Agrotechnology and Food Innovations B production, and available biomass conversion technologies, biomass-based routes are expected to make and -caprolactam. Technologies involving direct isolation of aromatic building blocks from biomass

Grossmann, Ignacio E.

405

Electronic States and Optical Transitions in Bulk and Quantum Well Structures of III-V Compound Semiconductors  

E-Print Network (OSTI)

In this work we apply the methods of band structure calculation combined with self-consistent treatment of the light-matter interaction to a variety of problems in bulk semiconductors and semiconductor heterostructures as well as in new...

Cho, Yong Hee 1976-

2011-05-06T23:59:59.000Z

406

Critical analysis of plume containment modeling in a thin heterogeneous unconfined aquifer: application to a bulk fuel storage terminal  

E-Print Network (OSTI)

The reported hydrocarbon contamination and subsequent consultant work at a bulk fuel storage terminal has instigated the need to critically analyze modeling techniques in thin, heterogeneous, unconfined aquifers. This study provides an aquifer...

Mejia, Karl Edward

1997-01-01T23:59:59.000Z

407

Prevalence and spatial distribution of antibodies to Salmonella enterica serovar Typhimurium O antigens in bulk milk from Texas dairy herds.  

E-Print Network (OSTI)

The purpose of this study was to describe the herd antibody status to Salmonella Typhimurium as estimated from co-mingled milk samples and to describe the resulting geographical patterns found in Texas dairy herds. Bulk tank milk samples were...

Graham, Sherry Lynn

2004-09-30T23:59:59.000Z

408

Grain refinement using equal channel angular extrusion in bulk sections of copper 101 and aluminum alloys 3003 and 6061  

E-Print Network (OSTI)

GRAIN REFINEMENT USING EQUAL CHANNEL ANGULAR EXTRUSION IN BULK SECTIONS OF COPPER 101 AND ALUMINUM ALLOYS 3003 AND 6061 A Thesis by STEPHANE FERRASSE Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE May 1995 Major Subject: Mechanical Engineering GRAIN REFINEMENT USING EQUAL CHANNEL ANGULAR EXTRUSION IN BULK SECTIONS OF COPPER 101 AND ALUMINUM ALLOYS 3003 AND 6061 A Thesis by STEPHANE FERRASSE...

Ferrasse, Stephane

1995-01-01T23:59:59.000Z

409

Novel Mg-rich materials for hydrogen storage: bulk and nanoconfined Mg6Pd1-xTMx  

E-Print Network (OSTI)

Novel Mg-rich materials for hydrogen storage: bulk and nanoconfined Mg6Pd1-xTMx (TM = Ni, Ag, Cu for hydrogen storage: bulk and nanoconfined Mg6Pd1-xTMx (TM = Ni, Ag, Cu) compounds and MgH2-TiH2 on Hydrogen Storage) and in Warsaw (E-MRS Fall Meeting). I would like to share this PhD thesis with all

Paris-Sud XI, Université de

410

Bulk viscosity-driven freeze-out in heavy ion collisions  

E-Print Network (OSTI)

We give an review the HBT puzzle, and argue that its resolution requires the introduction of new physics close to the phase transition scale. We argue that a candidate for this new physics is bulk viscosity, recently postulated to peak, and even diverge, close to the phase transition temperature. We show that such a viscosity peak can force the system created in heavy ion collisions to become unstable, and filament into fragments whose size is weakly dependent on the global size of the system, thereby triggering freeze-out.

Giorgio Torrieri; Igor Mishustin; Boris Tomášik

2009-01-02T23:59:59.000Z

411

Nonlinear bulk viscosity and the stability of accelerated expansion in FRW spacetime  

E-Print Network (OSTI)

In the context of dark energy solutions, we consider a Friedmann-Robertson-Walker spacetime filled with a non-interacting mixture of dust and a viscous fluid, whose bulk viscosity is governed by the nonlinear model proposed in [15]. Through a phase space analysis of the equivalent dynamical system, existence and stability of critical solutions are established and the respective scale factors are computed. The results point towards the possibility of describing the current accelerated expansion of the Universe by means of the abovementioned nonlinear model for viscosity.

G. Acquaviva; A. Beesham

2014-05-14T23:59:59.000Z

412

Bulk Vitrification Performance Enhancement: Refractory Lining Protection Against Molten Salt Penetration  

SciTech Connect

Bulk vitrification (BV) is a process that heats a feed material that consists of glass-forming solids and dried low-activity waste (LAW) in a disposable refractory-lined metal box using electrical power supplied through carbon electrodes. The feed is heated to the point that the LAW decomposes and combines with the solids to generate a vitreous waste form. This study supports the BV design and operations by exploring various methods aimed at reducing the quantities of soluble Tc in the castable refractory block portion of the refractory lining, which limits the effectiveness of the final waste form.

Hrma, Pavel R.; Bagaasen, Larry M.; Schweiger, Michael J.; Evans, Michael B.; Smith, Benjamin T.; Arrigoni, Benjamin M.; Kim, Dong-Sang; Rodriguez, Carmen P.; Yokuda, Satoru T.; Matyas, Josef; Buchmiller, William C.; Gallegos, Autumn B.; Fluegel, Alexander

2007-08-06T23:59:59.000Z

413

Randall-Sundrum Model in the Presence of a Brane Bulk Viscosity  

E-Print Network (OSTI)

The presence of a bulk viscosity for the cosmic fluid on a single Randall-Sundrum brane is considered. The spatial curvature is assumed to be zero. The five-dimensional Friedmann equation is derived, together with the energy conservation equation for the viscous fluid. These governing equations are solved for some special cases: (i) in the low-energy limit when the matter energy density is small compared with brane tension; (ii) for a matter-dominated universe, and (iii) for a radiation-dominated universe. Rough numerical estimates, for the extreme case when the universe is at its Planck time, indicate that the viscous effect can be significant.

Brevik, I

2004-01-01T23:59:59.000Z

414

Full causal bulk viscous LRS Bianchi I with time varying constants  

E-Print Network (OSTI)

In this paper we study the evolution of a LRS Bianchi I Universe, filled with a bulk viscous cosmological fluid in the presence of time varying constants "but" taking into account the effects of a c-variable into the curvature tensor. We find that the only physical models are those which ``constants'' $G$ and $c$ are growing functions on time $t$, while the cosmological constant $\\Lambda$ is a negative decreasing function. In such solutions the energy density obeys the ultrastiff matter equation of state i.e. $\\omega=1$.

J. A. Belinchón

2004-10-15T23:59:59.000Z

415

Super-acceleration on the Brane by Energy Flow from the Bulk  

E-Print Network (OSTI)

We consider a brane cosmological model with energy exchange between brane and bulk. Parameterizing the energy exchange term by the scale factor and Hubble parameter, we are able to exactly solve the modified Friedmann equation on the brane. In this model, the equation of state for the effective dark energy has a transition behavior changing from $w_{de}^{eff}>-1$ to $w_{de}^{eff}dark energy on the brane has $w>-1$. Fitting data from type Ia supernova, Sloan Digital Sky Survey and Wilkinson Microwave Anisotropy Probe, our universe is predicted now in the state of super-acceleration with $w_{de0}^{eff}=-1.21$.

Rong-Gen Cai; Yungui Gong; Bin Wang

2005-11-30T23:59:59.000Z

416

Radiation detector using a bulk high T[sub c] superconductor  

DOE Patents (OSTI)

A radiation detector is provided, wherein a bulk high T[sub c] superconducting sample is placed in a magnetic field and maintained at a superconducting temperature. Photons of incident radiation will cause localized heating in superconducting loops of the sample destroying trapped flux and redistributing the fluxons, and reducing the critical current of the loops. Subsequent cooling of the sample in the magnetic field will cause trapped flux redistributed Abrikosov fluxons and trapped Josephson fluxons. The destruction and trapping of the fluxons causes changes in the magnetization of the sample inducing currents in opposite directions in a pickup coil which is coupled by an input coil to an rf SQUID. 4 figures.

Artuso, J.F.; Franks, L.A.; Hull, K.L.; Symko, O.G.

1993-12-07T23:59:59.000Z

417

Ultrafast magneto-photocurrents in GaAs: Separation of surface and bulk contributions  

E-Print Network (OSTI)

We induce ultrafast magneto-photocurrents in a GaAs crystal employing interband excitation with femtosecond laser pulses at room temperature and non-invasively separate surface and bulk contributions to the overall current response. The separation between the different symmetry contributions is achieved by measuring the simultaneously emitted terahertz radiation for different sample orientations. Excitation intensity and photon energy dependences of the magneto-photocurrents for linearly and circularly polarized excitations reveal an involvement of different microscopic origins, one of which we believe is the inverse Spin-Hall effect. Our experiments are important for a better understanding of the complex momentum-space carrier dynamics in magnetic fields.

Schmidt, Christian B; Tarasenko, Sergey A; Bieler, Mark

2015-01-01T23:59:59.000Z

418

Forest floor bulk density and depth at Savannah River - Draft Final Report.  

SciTech Connect

Knowing the amount of biomass across a landscape is becoming increasingly important to fire managers as new fuel and fire management decision support systems come on line. Fire managers rarely have the time or funding available to sample fuels operationally and often depend upon mean values for critical variables whose variation is often associated with simple stand characteristics such as age, forest type, time since last burn, stocking, or site, and other easily measured variables. This report outlines a study to collect and analyze litter and duff bulk density samples for developing a simple predictive tool to estimate forest floor fuel loading based on simple stand characteristics.

Maier, Brian; Ottmar, Roger; Wright, Clint

2004-12-28T23:59:59.000Z

419

Bulk Thermodynamics of SU(N) Lattice Gauge Theories at Large-N  

E-Print Network (OSTI)

We present a study of bulk thermodynamical quantities in the deconfined phase of pure lattice SU(N) gauge theories. We find that the deficit in pressure and entropy with respect to their free-gas values, for N=4,8, is remarkably close to that of SU(3). Th is suggests that understanding the strongly interacting nature of the deconfined phase, which is crucial for RHIC physics, can be done at large N. There, different analytical approaches simplify or become soluble, and one can check their predictions and point to their important ingredients.

Barak Bringoltz

2005-11-04T23:59:59.000Z

420

Heat treatment of bulk gallium arsenide using a phosphosilicate glass cap  

SciTech Connect

n-type bulk GaAs crystals, capped with chemically vapor-deposited phosphosilicate glass, were heat treated at temperatures in the range of 600 to 950 /sup 0/C. Measurements on Schottky diodes and solar cells fabricated on the heat-treated material, after removal of a damaged surface layer, show an increase in free-carrier concentration, in minority-carrier-diffusion length, and in solar-cell short-circuit current. The observed changes are attributed to a removal of lifetime-reducing acceptorlike impurities, defects, or their complexes.

Mathur, G.; Wheaton, M.L.; Borrego, J.M.; Ghandhi, S.K.

1985-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

A new damage testing system for detailed evaluation of damage behavior of bulk KDP and DKDP  

SciTech Connect

We describe a new damage testing approach and instrumentation that provides quantitative measurements of bulk damage performance versus fluence for several frequencies. A major advantage of this method is that it can simultaneously provide direct information on pinpoint density and size, and beam obscuration. This allows for more accurate evaluation of material performance under operational conditions. Protocols for laser conditioning to improve damage performance can also be easily and rapidly evaluated.This damage testing approach has enabled us to perform complex experiments toward probing the fundamental mechanisms of damage initiation and conditioning.

DeMange, P; Negres, R A; Carr, C W; Radousky, H B; Demos, S G

2004-11-17T23:59:59.000Z

422

Local and bulk susceptibilities of Np intermetallics in their paramagnetic state  

Science Journals Connector (OSTI)

Mössbauer-effect investigations under applied magnetic field and magnetization studies of neptunium intermetallics in their paramagnetic state are reported. It is shown that the bulk and local susceptibilities at 4.2 K (?B and ?L, respectively) agree even for highly hybridized 5f-electron systems. The results indicate dominant orbital contributions to the magnetic moment also for paramagnetic neptunium heavy-fermion compounds. For these Np systems proportionalities between ?L, ?B, density of states at the Fermi energy, and the isomer shift are pointed out.

J. Gal; F. J. Litterst; W. Potzel; J. Moser; U. Potzel; S. Fredo; S. Tapuchi; G. Shani; J. Jove; A. Cousson; M. Pages; G. M. Kalvius

1989-11-20T23:59:59.000Z

423

ANALYSES AND COMPARISON OF BULK AND COIL SURFACE SAMPLES FROM THE DWPF SLURRY MIX EVAPORATOR  

SciTech Connect

Sludge samples from the DWPF Slurry Mix Evaporator (SME) heating coil frame and coil surface were characterized to identify differences that might help identify heat transfer fouling materials. The SME steam coils have seen increased fouling leading to lower boil-up rates. Samples of the sludge were taken from the coil frame somewhat distant from the coil (bulk tank material) and from the coil surface (coil surface sample). The results of the analysis indicate the composition of the two SME samples are very similar with the exception that the coil surface sample shows {approx}5-10X higher mercury concentration than the bulk tank sample. Elemental analyses and x-ray diffraction results did not indicate notable differences between the two samples. The ICP-MS and Cs-137 data indicate no significant differences in the radionuclide composition of the two SME samples. Semi-volatile organic analysis revealed numerous organic molecules, these likely result from antifoaming additives. The compositions of the two SME samples also match well with the analyzed composition of the SME batch with the exception of significantly higher silicon, lithium, and boron content in the batch sample indicating the coil samples are deficient in frit relative to the SME batch composition.

Hay, M.; Nash, C.; Stone, M.

2012-02-17T23:59:59.000Z

424

Preparation of extrusions of bulk mixed oxide compounds with high macroporosity and mechanical strength  

DOE Patents (OSTI)

A simple and effective method for producing bulk single and mixed oxide absorbents and catalysts is disclosed. The method yields bulk single oxide and mixed oxide absorbent and catalyst materials which combine a high macroporosity with relatively high surface area and good mechanical strength. The materials are prepared in a pellet form using as starting compounds, calcined powders of the desired composition and physical properties these powders are crushed to broad particle size distribution, and, optionally may be combined with an inorganic clay binder. The necessary amount of water is added to form a paste which is extruded, dried and heat treated to yield and desired extrudate strength. The physical properties of the extruded materials (density, macroporosity and surface area) are substantially the same as the constituent powder is the temperature of the heat treatment of the extrudates is approximately the same as the calcination temperature of the powder. If the former is substantially higher than the latter, the surface area decreases, but the macroporosity of the extrusions remains essentially constant.

Flytzani-Stephanopoulos, Maria (Winchester, MA); Jothimurugesan, Kandaswami (Baton Rouge, LA)

1990-01-01T23:59:59.000Z

425

Measuring the bulk Lorentz factors of gamma-ray bursts with Fermi  

E-Print Network (OSTI)

Gamma-ray bursts (GRBs) are powered by ultra-relativistic jets. Usually a minimum value of the Lorentz factor of the relativistic bulk motion is obtained based on the argument that the observed high energy photons ($\\gg {\\rm MeV}$) can escape without suffering from absorption due to pair production. The exact value, rather than a lower limit, of the Lorentz factor can be obtained if the spectral cutoff due to such absorption is detected. With the good spectral coverage of the Large Area Telescope (LAT) on {\\em Fermi}, measurements of such cutoff become possible, and two cases (GRB 090926A and GRB 100724B) have been reported to have high-energy cutoffs or breaks. We systematically search for such high energy spectral cutoffs/breaks from LAT and GBM observations of the prompt emission of GRBs detected since August 2011. Seven more GRBs are found to have cutoff-like spectral feature at energies of $\\sim20-300$ MeV. Assuming that these cutoffs are caused by pair-production absorption within the source, the bulk L...

Tang, Qing-Wen; Wang, Xiang-Yu; Tam, Pak-Hin Thomas

2014-01-01T23:59:59.000Z

426

Erosion behaviour of ceramic bulk and coating materials caused by water droplet impingement  

Science Journals Connector (OSTI)

Turbine blades in the low-steam environment of energy generation systems suffer severe erosion due to the impingement of water droplets. Erosion resistance of metallic substrates to droplet impingement could possibly be improved with ceramic coating. However, the erosion resistance of ceramic material has not been sufficiently evaluated with respect to selection and maintenance of component materials in power plant systems. A water-jet apparatus, for which impingement velocity and number of water droplets have been well characterized, was used in this study. Erosion tests were conducted on various ceramic bulk and coating materials and on the metallic substrates to investigate erosion behaviour and resistance. Erosion behaviour was characterized by the incubation period and the subsequent damage depth rate. Some ceramic bulk materials had short incubation periods and significant damage depth rates. Zirconia normally had the longest incubation periods and the lowest damage depths. The erosion rate was calculated from the relationship between logarithms of damage depth and impact velocity. The incubation period was also correlated with the logarithm of impact velocity. Both velocity constants in erosion damage and incubation periods of these ceramic materials were strongly correlated with fracture toughness, but not with hardness of the materials. Damage depth rates calculated from the relationship with impact velocity and fracture toughness were comparable to experimentally measured damage depth rates for various ceramic materials.

Y.I. Oka; H. Miyata

2009-01-01T23:59:59.000Z

427

Constraining a bulk viscous matter-dominated cosmological model using SNe Ia, CMB and LSS  

E-Print Network (OSTI)

We present and constrain a cosmological model which component is a pressureless fluid with bulk viscosity as an explanation for the present accelerated expansion of the universe. We study the particular model of a constant bulk viscosity coefficient \\zeta_m. The possible values of \\zeta_m are constrained using the cosmological tests of SNe Ia Gold 2006 sample, the CMB shift parameter R from the three-year WMAP observations, the Baryon Acoustic Oscillation (BAO) peak A from the Sloan Digital Sky Survey (SDSS) and the Second Law of Thermodynamics (SLT). It was found that this model is in agreement with the SLT using only the SNe Ia test. However when the model is submitted to the three cosmological tests together (SNe+CMB+BAO) the results are: 1.- the model violates the SLT, 2.- predicts a value of H_0 \\approx 53 km sec^{-1} Mpc^{-1} for the Hubble constant, and 3.- we obtain a bad fit to data with a \\chi^2_{min} \\approx 400 (\\chi^2_{d.o.f.} \\approx 2.2). These results indicate that this model is ruled out by the observations.

Arturo Avelino; U. Nucamendi; F. S. Guzmán

2008-01-10T23:59:59.000Z

428

Void asymmetries in the cosmic web: a mechanism for bulk flows  

E-Print Network (OSTI)

Bulk flows of galaxies moving with respect to the cosmic microwave background are well established observationally and seen in the most recent LCDM simulations. With the aid of an idealised Gadget-2 simulation, we show that void asymmetries in the cosmic web can exacerbate local bulk flows of galaxies. The Cosmicflows-2 survey, which has mapped in detail the 3D structure of the Local Universe, reveals that the Local Group resides in a "local sheet" of galaxies that borders a "local void" with a diameter of about 40 Mpc. The void is emptying out at a rate of 16 km/s/Mpc. In a co-moving frame, the Local Sheet is found to be moving away from the Local Void at ~ 260 km/s. Our model shows how asymmetric collapse due to unbalanced voids on either side of a developing sheet or wall can lead to a systematic movement of the sheet. We conjectured that asymmetries could lead to a large-scale separation of dark matter and baryons, thereby driving a dependence of galaxy properties with environment, but we do not find any ...

Bland-Hawthorn, Joss

2014-01-01T23:59:59.000Z

429

Bulk diffusion induced structural modifications of carbon-transition metal nanocomposite films  

SciTech Connect

The influence of transition metal (TM = V,Co,Cu) type on the bulk diffusion induced structural changes in carbon:TM nanocomposite films is investigated. The TMs have been incorporated into the carbon matrix via ion beam co-sputtering, and subsequently the films have been vacuum annealed in the temperature range of 300 - 700 deg. C. The structure of both the dispersed metal rich and the carbon matrix phases has been determined by a combination of elastic recoil detection analysis, x-ray diffraction, transmission electron microscopy, and Raman spectroscopy. The as-grown films consist of carbidic (V and Co) and metallic (Cu) nanoparticles dispersed in the carbon matrix. Thermal annealing induces surface segregation of Co and Cu starting at {>=} 500 deg. C, preceded by the carbide-metal transformation of Co-carbide nanoparticles at {approx} 300 deg. C. No considerable morphological changes occur in C:V films. In contrast to the surface diffusion dominated regime where all the metals enhance the six-fold ring clustering of C, in the bulk diffusion controlled regime only Co acts as a catalyst for the carbon graphitization. These results are consistent with the metal-induced crystallization mechanism in the C:Co films. The results are discussed on the basis of the metal-carbide phase stability, carbon solubility in metals or their carbides, and interface species.

Berndt, M.; Abrasonis, G.; Kovacs, Gy. J.; Krause, M.; Munnik, F.; Heller, R.; Kolitsch, A.; Moeller, W.

2011-03-15T23:59:59.000Z

430

High Efficiency m-plane LEDs on Low Defect Density Bulk GaN Substrates  

SciTech Connect

Solid-state lighting is a key technology for reduction of energy consumption in the US and worldwide. In principle, by replacing standard incandescent bulbs and other light sources with sources based on light-emitting diodes (LEDs), ultimate energy efficiency can be achieved. The efficiency of LEDs has improved tremendously over the past two decades, however further progress is required for solid- state lighting to reach its full potential. The ability of an LED at converting electricity to light is quantified by its internal quantum efficiency (IQE). The material of choice for visible LEDs is Gallium Nitride (GaN), which is at the basis of blue-emitting LEDs. A key factor limiting the performance of GaN LEDs is the so-called efficiency droop, whereby the IQE of the LED decreases significantly at high current density. Despite decades of research, efficiency droop remains a major issue. Since high-current operation is necessary for practical lighting applications, reducing droop is a major challenge for the scientific community and the LED industry. Our approach to solving the droop issue is the use of newly available low-defect-density bulk GaN non-polar substrates. In contrast to the standard foreign substrates (sapphire, silicon carbide, silicon) used in the industry, we have employed native bulk GaN substrates with very low defect density, thus ensuring exquisite material quality and high IQE. Whereas all commercial LEDs are grown along the c-plane crystal direction of GaN, we have used m-plane non-polar substrates; these drastically modify the physical properties of the LED and enable a reduction of droop. With this approach, we have demonstrated very high IQE performance and low droop. Our results focused on violet and blue LEDs. For these, we have demonstrated very high peak IQEs and current droops of 6% and 10% respectively (up to a high current density of 200A.cm-2). All these results were obtained under electrical operation. These high IQE and low droop values are in line with the program’s milestones. They demonstrate that bulk non-polar GaN substrates represent a disruptive technology for LED performance. Application of this technology to real-world products is feasible, provided that the cost of GaN substrates is compatible with the market’s requirement.

David, Aurelien

2012-10-15T23:59:59.000Z

431

Power balance in ELMO Bumpy Torus: bulk electrons and ions in a 37 kW discharge  

SciTech Connect

The power balance of the bulk electrons and ions in discharges with 37 kW of applied microwave power in the ELMO Bumpy Torus (EBT) is examined in a zero-dimensional model using data on the intensity and linewidth of the molecular and atomic hydrogen emission. At least 60% of the applied power is ultimately dissipated by processes involving the neutral particles, including dissociation of molecules, ionization of and radiation from atoms, and heating of cold electrons produced during atomic ionization. The molecular influx rate and the density of atoms are used independently to determine the bulk electron particle confinement time, and an upper bound estimate is made of the diffusional power loss from the bulk plasma electrons. Parameters derived from the basic spectroscopic data presented in this paper include the neutral atom density 2 - 5x10/sup 10/ cm/sup -3/, incident molecular flux 3 - 5x10/sup 15/ cm/sup -2/s/sup -1/, bulk ion temperature approx. =3 eV, and particle confinement time <1.1 ms. The bulk electron energy confinement time is 0.7 ms or less in the standard operating regime. Published data on the nonthermal electron and ion populations in the plasma are used to evaluate approximately the overall energy flow in the discharge. 54 refs.

McNeill, D.H.

1985-10-01T23:59:59.000Z

432

Changing Trends in the Bulk Chemicals and Pulp and Paper Industries (released in AEO2005)  

Reports and Publications (EIA)

Compared with the experience of the 1990s, rising energy prices in recent years have led to questions about expectations of growth in industrial output, particularly in energy-intensive industries. Given the higher price trends, a review of expected growth trends in selected industries was undertaken as part of the production of Annual Energy Outlook 2005 (AEO). In addition, projections for the industrial value of shipments, which were based on the Standard Industrial Classification (SIC) system in AEO2004, are based on the North American Industry Classification System (NAICS) in AEO2005. The change in industrial classification leads to lower historical growth rates for many industrial sectors. The impacts of these two changes are highlighted in this section for two of the largest energy-consuming industries in the U.S. industrial sector-bulk chemicals and pulp and paper.

2005-01-01T23:59:59.000Z

433

Bulk matter physics and its future at the Large Hadron Collider  

E-Print Network (OSTI)

Measurements at low transverse momentum will be performed at the LHC for studying particle production mechanisms in $pp$ and heavy-ion collisions. Some of the experimental capabilities for bulk matter physics are presented, focusing on tracking elements and particle identification. In order to anticipate the study of baryon production for both colliding systems at multi-TeV energies, measurements for identified species and recent model extrapolations are discussed. Several mechanisms are expected to compete for hadro-production in the low momentum region. For this reason, experimental observables that could be used for investigating multi-parton interactions and help understanding the "underlying event" content in the first $pp$ collisions at the LHC are also mentioned.

B. Hippolyte

2009-01-21T23:59:59.000Z

434

Experimental determination of strain partitioning among individual grains in the bulk of an aluminium multicrystal  

SciTech Connect

A recently developed marker-based technique for mapping of the displacement gradient tensor and the strain throughout the bulk of optically opaque specimens is presented and applied to an aluminium alloy multicrystal. Through investigations at 4%, 10% and 14% axial strains, the internal strain field is observed to be non-homogenous with the observed patterns present throughout the range of strains investigated. The morphology of the strain field is visualized with a resolution better than 50{mu}m and variations are tentatively associated with the grain structure as recorded by EBSD. Future applications of the technique in combination with other 3-dimensional approaches are discussed with respect to comparison with Finite Element modelling approaches.

Haldrup, K. [Metal Structures in 4D, Materials Research Department, Riso National Laboratory/ DTU, Frederiksborgvej 399, 4000, Roskilde Denmark (Denmark)], E-mail: kristoffer.haldrup@risoe.dk; Beckmann, F. [GKSS-Research Center Geesthacht, 21502 Geesthacht (Germany); Nielsen, S.F. [Materials Research Department, Riso National Laboratory/ DTU, Frederiksborgvej 399, 4000, Roskilde Denmark (Denmark); Wert, J.A. [Metal Structures in 4D, Materials Research Department, Riso National Laboratory/ DTU, Frederiksborgvej 399, 4000, Roskilde Denmark (Denmark); Materials Research Department, Riso National Laboratory/ DTU, Frederiksborgvej 399, 4000, Roskilde Denmark (Denmark)

2008-07-15T23:59:59.000Z

435

Excitonic enhancement of nonradiative energy transfer to bulk silicon with the hybridization of cascaded quantum dots  

SciTech Connect

We report enhanced sensitization of silicon through nonradiative energy transfer (NRET) of the excitons in an energy-gradient structure composed of a cascaded bilayer of green- and red-emitting CdTe quantum dots (QDs) on bulk silicon. Here NRET dynamics were systematically investigated comparatively for the cascaded energy-gradient and mono-dispersed QD structures at room temperature. We show experimentally that NRET from the QD layer into silicon is enhanced by 40% in the case of an energy-gradient cascaded structure as compared to the mono-dispersed structures, which is in agreement with the theoretical analysis based on the excited state population-depopulation dynamics of the QDs.

Yeltik, Aydan; Guzelturk, Burak; Akhavan, Shahab [Department of Physics and Department of Electrical and Electronics Engineering, UNAM—Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800 (Turkey)] [Department of Physics and Department of Electrical and Electronics Engineering, UNAM—Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800 (Turkey); Ludwig Hernandez-Martinez, Pedro; Volkan Demir, Hilmi, E-mail: volkan@stanfordalumni.org [Department of Physics and Department of Electrical and Electronics Engineering, UNAM—Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800 (Turkey); Luminous Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering and School of Physical and Mathematical Sciences, Nanyang Technological University, Nanyang Avenue, Singapore 639798 (Singapore)

2013-12-23T23:59:59.000Z

436

Short time proton dynamics in bulk ice and in porous anode solid oxide fuel cell materials  

SciTech Connect

Oxygen reduction and incorporation into solid electrolytes and the reverse reaction of oxygen evolution play a cru-cial role in Solid Oxide Fuel Cell (SOFC) applications. However a detailed un derstanding of the kinetics of the cor-responding reactions, i.e. on reaction mechanisms, rate limiting steps, reaction paths, electrocatalytic role of materials, is still missing. These include a thorough characterization of the binding potentials experienced by protons in the lattice. We report results of Inelastic Neutron Scattering (INS) measurements of the vibrational state of the protons in Ni- YSZ highly porous composites (75% to 90% ), a ceramic-metal material showing a high electrical conductivity and ther mal stability, which is known to be most effectively used as anodes for solid ox ide fuel cells. The results are compared with INS and Deep Inelastic Neutron Scattering (DINS) experiments on the proton binding states in bulk ice.

Basoli, Francesco [Università degli Studi di Roma Tor Vergata, Italy] [Università degli Studi di Roma Tor Vergata, Italy; Senesi, Roberto [ORNL] [ORNL; Kolesnikov, Alexander I [ORNL] [ORNL; Licoccia, Silvia [NAST Center, University of Roma "Tor Vergata"] [NAST Center, University of Roma "Tor Vergata"

2014-01-01T23:59:59.000Z

437

Radiation detector using a bulk high T.sub.c superconductor  

DOE Patents (OSTI)

A radiation detector (10) is provided, wherein a bulk high T.sub.c superconducting sample (11) is placed in a magnetic field and maintained at a superconducting temperature. Photons of incident radiation will cause localized heating in superconducting loops of the sample destroying trapped flux and redistributing the fluxons, and reducing the critical current of the loops. Subsequent cooling of the sample in the magnetic field will cause trapped flux redistributed Abrikosov fluxons and trapped Josephson fluxons. The destruction and trapping of the fluxons causes changes in the magnetization of the sample inducing currents in opposite directions in a pickup coil (12) which is coupled by an input coil (15) to an rf SQUID (16).

Artuso, Joseph F. (Santa Barbara, CA); Franks, Larry A. (Santa Barbara, CA); Hull, Kenneth L. (Ventura, CA); Symko, Orest G. (Salt Lake City, UT)

1993-01-01T23:59:59.000Z

438

Ambient-Pressure Bulk Superconductivity Deep in the Magnetic State of CeRhIn5  

SciTech Connect

Specific heat, magnetic susceptibility and electrical transport measurements were performed at ambient pressure on high-quality single crystal specimens of CeRhIn5 down to ultra-low temperatures. We report signatures of an anomaly observed in all measured quantities consistent with a bulk phase transition to a superconducting state at T{sub c}=110 mK. Occurring far below the onset of antiferromagnetism at T{sub N}=3.8 K, this transition appears to involve a significant portion of the available low-temperature density of electronic states, exhibiting an entropy change in line with that found in other members of the 115 family of superconductors tuned away from quantum criticality.

Paglione,J.; Ho, P.; Maple, M.; Tanatar, M.; Taillefer, L.; Lee, Y.; Petrovic, C.

2008-01-01T23:59:59.000Z

439

Diffusivity determination in bulk materials on nanometric length scales using neutron reflectometry  

Science Journals Connector (OSTI)

An approach based on neutron reflectometry and isotope heterostructures is presented in order to determine self-diffusivities in bulk materials on small length scales of 1–10 nm. The method is demonstrated for lithium self-diffusion in LiNbO3 single crystals at low temperatures of 200 and 250?°C using 6LiNbO3 (amorphous film)/natLiNbO3 (single crystal) structures for analysis. Lithium diffusivities are derived from neutron reflectivity patterns in good agreement with results obtained by secondary ion mass spectrometry on the same type of samples but on larger length scales up to 90 nm, as given in literature. In addition, neutron reflectivity simulations were performed in order to investigate the influence of diffusion length and scattering length density on the quality of the results. The limitation of the method is discussed.

E. Hüger; J. Rahn; J. Stahn; T. Geue; H. Schmidt

2012-06-04T23:59:59.000Z

440

Thermodynamic Relationships for Bulk Crystalline and Liquid Phases in the Phase-Field Crystal Model  

E-Print Network (OSTI)

We present thermodynamic relationships between the free energy of the phase-field crystal (PFC) model and thermodynamic state variables for bulk phases under hydrostatic pressure. This relationship is derived based on the thermodynamic formalism for crystalline solids of Larch\\'e and Cahn [Larch\\'e and Cahn, Acta Metallurgica, Vol. 21, 1051 (1973)]. We apply the relationship to examine the thermodynamic processes associated with varying the input parameters of the PFC model: temperature, lattice spacing, and the average value of the PFC order parameter, $\\bar{n}$. The equilibrium conditions between bulk crystalline solid and liquid phases are imposed on the thermodynamic relationships for the PFC model to obtain a procedure for determining solid-liquid phase coexistence. The resulting procedure is found to be in agreement with the method commonly used in the PFC community, justifying the use of the common-tangent construction to determine solid-liquid phase coexistence in the PFC model. Finally, we apply the procedure to an eighth-order-fit (EOF) PFC model that has been parameterized to body-centered-cubic ($bcc$) Fe [Jaatinen et al., Physical Review E 80, 031602 (2009)] to demonstrate the procedure as well as to develop physical intuition about the PFC input parameters. We demonstrate that the EOF-PFC model parameterization does not predict stable $bcc$ structures with positive vacancy densities. This result suggests an alternative parameterization of the PFC model, which requires the primary peak position of the two-body direct correlation function to shift as a function of $\\bar{n}$.

Victor W. L. Chan; Nirand Pisutha-Arnond; Katsuyo Thornton

2015-02-06T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Annealing behavior of the hydrogen-vacancy complex in bulk indium phosphide crystals  

SciTech Connect

In order to explain the effects of hydrogen on the electrical properties of bulk indium phosphide crystals, they have performed a series of high temperature annealing studies with both undoped and iron-doped indium phosphide crystals. The samples were annealed at 900 C for 6, 36, and 72 hours, respectively, under a phosphorus overpressure of five atmospheres. Samples were characterized at 10 K by Fourier transform infrared absorption spectroscopy which allowed us to measure the concentrations of both the Fe{sup 2+} and V{sub In}-H{sub 4} defects simultaneously. Undoped samples were further characterized by the Hall effect measurements. The authors find in the iron-doped samples that the [Fe{sup 2+}]/[Fe{sup 3+}] ratio decreases gradually with increasing annealing time, indicating a reduction in the number of donors in the samples. In the undoped samples, annealing leads to a reduction of the free electron concentration accompanied by an increase in the 77 K mobility. The increase of the sample`s mobility eliminates the possibility that the reduction of the free electron concentration is due to an increase in the concentration of the compensating acceptors. The explanation for the observed behavior in all samples is that hydrogen acts as a donor and it diffuses out of the crystal during the annealing process. Based on the experimental data, they propose a calibration equation of [V{sub In}-H{sub 4}] = 4.2 {times} 10{sup 16} cm{sup {minus}1} {times} Absorbance (cm{sup {minus}1}) which is used to correlate the hydrogen-vacancy complex concentrations with the changes of the V{sub In}-H{sub 4} absorption peak in both the iron-doped and the undoped samples. Their results confirm the donor nature of the hydrogen-vacancy complex and provide strong evidence regarding the reduction mechanism of free carrier concentrations in bulk indium phosphide crystals during high temperature annealing under a phosphorus atmosphere.

Ye, Q.; Wolk, J.A.; Bourret-Courchesne, E.D. [Lawrence Berkeley National Lab., CA (United States). Materials Sciences Div.; Bliss, D.F. [Air Force Rome Lab., Hanscom AFB, MA (United States)

1998-12-31T23:59:59.000Z

442

The microhardness and microstructural characteristics of bulk molybdenum samples obtained by consolidating nanopowders by plasma pressure compaction  

Science Journals Connector (OSTI)

In this paper is presented consolidation of nanometer-sized molybdenum powders to form bulk samples by the technique of Plasma Pressure Compaction (P2C). The nanocrystalline powders, consolidated at a temperature of 1400 °C and pressure of 48 \\{MPa\\} for a time period of 3 min, had a theoretical density of 97%. The presence of distributed agglomerates in the nanocrystalline powders has an influence on density and microstructure of the bulk metal sample. To facilitate comparison micrometer-sized powders of molybdenum were also consolidated, at a temperature of 1650 °C, and had a theoretical density of 98.5%. The bulk sample obtained by consolidating nanocrystalline powders had a higher microhardness (2.95 GPa) than the sample obtained by consolidating from micron-sized powders (2.16 GPa).

T.S Srivatsan; B.G Ravi; M Petraroli; T.S Sudarshan

2002-01-01T23:59:59.000Z

443

Direct measurement of the kinetics of volume and enthalpy relaxation of an Au-based bulk metallic glass  

SciTech Connect

Structural relaxation of glasses below their glass transition is a well-studied phenomenon that still poses several open issues. With the advent of bulk metallic glasses with exceptionally low glass transition temperatures, new options are available that are based on the experimental assessment of the time dependence of several different thermodynamic quantities by direct measurements with high accuracy. In this contribution the first direct measurement of the isothermal relaxation of the volume and the enthalpy of an Au-based bulk metallic glassformer are reported and discussed with respect of the characteristics describing the underlying processes.

Bünz, J.; Wilde, G. [Institute of Materials Physics, University of Münster, 48149 Münster (Germany)] [Institute of Materials Physics, University of Münster, 48149 Münster (Germany)

2013-12-14T23:59:59.000Z

444

Evaluation of X-ray Diffraction of Bit Cuttings as a Proxy for Core Data in Determining Bulk Mineralogy and Clay Species, Bakken Formation, Williston Basin.  

E-Print Network (OSTI)

??The principal question addressed in this study concerns the applicability of x-ray diffractometry to determine bulk rock mineralogy and clay species in the absence of… (more)

Barnes, Stuart Lee

2011-01-01T23:59:59.000Z

445

Bulk ion acceleration and particle heating during magnetic reconnection in a laboratory plasma  

SciTech Connect

Bulk ion acceleration and particle heating during magnetic reconnection are studied in the collisionless plasma of the Magnetic Reconnection Experiment (MRX). The plasma is in the two-fluid regime, where the motion of the ions is decoupled from that of the electrons within the ion diffusion region. The reconnection process studied here is quasi-symmetric since plasma parameters such as the magnitude of the reconnecting magnetic field, the plasma density, and temperature are compatible on each side of the current sheet. Our experimental data show that the in-plane (Hall) electric field plays a key role in ion heating and acceleration. The electrostatic potential that produces the in-plane electric field is established by electrons that are accelerated near the electron diffusion region. The in-plane profile of this electrostatic potential shows a “well” structure along the direction normal to the reconnection current sheet. This well becomes deeper and wider downstream as its boundary expands along the separatrices where the in-plane electric field is strongest. Since the in-plane electric field is 3–4 times larger than the out-of-plane reconnection electric field, it is the primary source of energy for the unmagnetized ions. With regard to ion acceleration, the Hall electric field causes ions near separatrices to be ballistically accelerated toward the outflow direction. Ion heating occurs as the accelerated ions travel into the high pressure downstream region. This downstream ion heating cannot be explained by classical, unmagnetized transport theory; instead, we conclude that ions are heated by re-magnetization of ions in the reconnection exhaust and collisions. Two-dimensional (2-D) simulations with the global geometry similar to MRX demonstrate downstream ion thermalization by the above mechanisms. Electrons are also significantly heated during reconnection. The electron temperature sharply increases across the separatrices and peaks just outside of the electron diffusion region. Unlike ions, electrons acquire energy mostly from the reconnection electric field, and the energy gain is localized near the X-point. However, the increase in the electron bulk flow energy remains negligible. These observations support the assertion that efficient electron heating mechanisms exist around the electron diffusion region and that the heat generated there is quickly transported along the magnetic field due to the high parallel thermal conductivity of electrons. Classical Ohmic dissipation based on the perpendicular Spitzer resistivity is too small to balance the measured heat flux, indicating the presence of anomalous electron heating.

Yoo, Jongsoo; Yamada, Masaaki; Ji, Hantao; Jara-Almonte, Jonathan; Myers, Clayton E. [Center for Magnetic Self-Organization, Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)] [Center for Magnetic Self-Organization, Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

2014-05-15T23:59:59.000Z

446

Bulk SmCo5/a-Fe nanocomposite permanent magnets fabricated by mould-free Joule-heating compaction  

E-Print Network (OSTI)

Bulk SmCo5/a-Fe nanocomposite permanent magnets fabricated by mould-free Joule-heating compaction and soft magnetic phases.1­3 The prerequisite for effective exchange coupling is a small grain size, which are used to produce single-phase microcrystalline permanent magnets, are ineffective in producing

Liu, J. Ping

447

Terahertz radiation and second-harmonic generation from InAs: Bulk versus surface electric-field-induced contributions  

E-Print Network (OSTI)

Terahertz radiation and second-harmonic generation from InAs: Bulk versus surface electric-harmonic generation and terahertz radiation emission indicates that the observed dominant surface electric-field-induced contributions Matthew Reid, Igor V. Cravetchi, and Robert Fedosejevs Department of Electrical and Computer

Reid, Matthew

448

Production of Cyclic Lipopeptides by Pseudomonas fluorescens Strains in Bulk Soil and in the Sugar Beet Rhizosphere  

Science Journals Connector (OSTI)

...degraded the viscosinamide in the soil. When P. fluorescens strains...and DSS73 were added to bulk soil, the CFU counts were nearly...producing cells (17), and washing the inocula before adding them to the soil therefore results in very low...

Tommy Harder Nielsen; Jan Sørensen

2003-02-01T23:59:59.000Z

449

Colloidal electroconvection in a thin horizontal cell: II. Bulk electroconvection of water during parallel-plate electrolysis  

E-Print Network (OSTI)

Colloidal electroconvection in a thin horizontal cell: II. Bulk electroconvection of water during parallel-plate electrolysis Yilong Han Department of Physics and Astronomy, University of Pennsylvania 209, they appear to result from an underlying electroconvective instability during electrolysis in the parallel

Grier, David

450

Colloidal electroconvection in a thin horizontal cell: II. Bulk electroconvection of water during parallel-plate electrolysis  

E-Print Network (OSTI)

Colloidal electroconvection in a thin horizontal cell: II. Bulk electroconvection of water during parallel-plate electrolysis Yilong Han Department of Physics and Astronomy, University of Pennsylvania 209 electrolysis in the parallel plate geometry. This contrasts with recent theoretical results suggesting

Grier, David

451

Non-equivalence between temperature and energy content: existence of states with non-Maxwellian bulks induced by ECH  

E-Print Network (OSTI)

Cyclotron Heating on the electron distribution function in tokamak plasmas.1-3 One of the motivations-Paul-lez-Durance, France Electron temperature profiles measured by Electron Cyclotron Emission and Thomson Scattering V. Krivenski, Electron Cyclotron Emission by non-Maxwellian Bulk Distribution Functions (Proc. 11th

452

Bulk Dislocation Core Dissociation Probed by Coherent X Rays in Silicon V. L. R. Jacques,1,2  

E-Print Network (OSTI)

a route for the study of dislocation cores in the bulk in a static or dynamical regime, and under various a few techniques can probe such a discontinuity of space. Transmission electron microscopy (TEM that sheds light on isolated dislocation lines deep inside samples and provides valuable information about

Paris-Sud 11, Université de

453

,"Finished Motor Gasoline Refinery, Bulk Terminal, and Natural Gas Plant Stocks"  

U.S. Energy Information Administration (EIA) Indexed Site

Monthly","9/2013","1/15/1993" Monthly","9/2013","1/15/1993" ,"Release Date:","11/27/2013" ,"Next Release Date:","Last Week of December 2013" ,"Excel File Name:","pet_stoc_st_a_epm0f_str_mbbl_m.xls" ,"Available from Web Page:","http://www.eia.gov/dnav/pet/pet_stoc_st_a_epm0f_str_mbbl_m.htm" ,"Source:","Energy Information Administration" ,"For Help, Contact:","infoctr@eia.gov" ,,"(202) 586-8800",,,"11/25/2013 11:32:19 AM" "Back to Contents","Data 1: Finished Motor Gasoline Refinery, Bulk Terminal, and Natural Gas Plant Stocks" "Sourcekey","MGFSXUS1","MGFSXP11","MGFSXCT1","MGFS3_SDE_1","MGFSXFL1","MGFSXGA1","MGFS3_SME_1","MGFS3_SMD_1","MGFSXMA1","MGFS3_SNH_1","MGFSXNJ1","MGFSXNY1","MGFSXNC1","MGFSXPA1","MGFSXRI1","MGFSXSC1","MGFS3_SVT_1","MGFSXVA1","MGFSXWV1","MGFSXP21","MGFSXIL1","MGFSXIN1","MGFSXIA1","MGFS3_SKS_1","MGFSXKY1","MGFSXMI1","MGFSXMN1","MGFSXMO1","MGFS3_SNE_1","MGFS3_SND_1","MGFSXOH1","MGFSXOK1","MGFS3_SSD_1","MGFSXTN1","MGFSXWI1","MGFSXP31","MGFSXAL1","MGFSXAR1","MGFSXLA1","MGFSXMS1","MGFSXNM1","MGFSXTX1","MGFSXP41","MGFSXCO1","MGFSXID1","MGFSXMT1","MGFSXUT1","MGFSXWY1","MGFSXP51","MGFSXAK1","MGFSXAZ1","MGFSXCA1","MGFSXHI1","MGFSXNV1","MGFSXOR1","MGFSXWA1"

454

,"Finished Motor Gasoline Refinery, Bulk Terminal, and Natural Gas Plant Stocks"  

U.S. Energy Information Administration (EIA) Indexed Site

Annual",2012,"6/30/1993" Annual",2012,"6/30/1993" ,"Release Date:","9/27/2013" ,"Next Release Date:","9/26/2014" ,"Excel File Name:","pet_stoc_st_a_epm0f_str_mbbl_a.xls" ,"Available from Web Page:","http://www.eia.gov/dnav/pet/pet_stoc_st_a_epm0f_str_mbbl_a.htm" ,"Source:","Energy Information Administration" ,"For Help, Contact:","infoctr@eia.gov" ,,"(202) 586-8800",,,"11/25/2013 11:32:18 AM" "Back to Contents","Data 1: Finished Motor Gasoline Refinery, Bulk Terminal, and Natural Gas Plant Stocks" "Sourcekey","MGFSXUS1","MGFSXP11","MGFSXCT1","MGFS3_SDE_1","MGFSXFL1","MGFSXGA1","MGFS3_SME_1","MGFS3_SMD_1","MGFSXMA1","MGFS3_SNH_1","MGFSXNJ1","MGFSXNY1","MGFSXNC1","MGFSXPA1","MGFSXRI1","MGFSXSC1","MGFS3_SVT_1","MGFSXVA1","MGFSXWV1","MGFSXP21","MGFSXIL1","MGFSXIN1","MGFSXIA1","MGFS3_SKS_1","MGFSXKY1","MGFSXMI1","MGFSXMN1","MGFSXMO1","MGFS3_SNE_1","MGFS3_SND_1","MGFSXOH1","MGFSXOK1","MGFS3_SSD_1","MGFSXTN1","MGFSXWI1","MGFSXP31","MGFSXAL1","MGFSXAR1","MGFSXLA1","MGFSXMS1","MGFSXNM1","MGFSXTX1","MGFSXP41","MGFSXCO1","MGFSXID1","MGFSXMT1","MGFSXUT1","MGFSXWY1","MGFSXP51","MGFSXAK1","MGFSXAZ1","MGFSXCA1","MGFSXHI1","MGFSXNV1","MGFSXOR1","MGFSXWA1"

455

One-Electron Theory of the Bulk Properties of Crystalline Ar, Kr, and Xe  

Science Journals Connector (OSTI)

The cohesive energy as a function of lattice constant and the P-V relation for Ar, Kr, and Xe have been calculated at T=0 K in the static-lattice limit. The calculation employed the self-consistent augmented-plane-wave statistical-exchange (APW-X?) method, which, except for our own preliminary work, has not heretofore been applied to the study of the bulk properties of a van der Waals crystal. The agreement with experiment is at least semiquantitative with respect to the cohesive energies. The comparison with extant P V data is acceptable. By use of a static-lattice sum of a pair-potential function with undetermined parameters, an effective pair potential is determined, with fairly realistic parameter values as a result. Comparison with other energy-band calculations shows that the occupied one-electron energies found in this calculation are in good agreement with those found by other workers. The conduction-band energies are not a result that is usual in X? calculations. The over-all trends found in this calculation are related to those found by Averill in a recent APW-X? calculation on the alkali metals.

S. B. Trickey; F. R. Green; Jr.; Frank W. Averill

1973-11-15T23:59:59.000Z

456

CLEARANCE OF BULK MATERIALS FROM D&D - LIFE AFTER THE NAS REPORT  

SciTech Connect

Lack of consistent free release standards for solid materials has been an issue that has been around for several decades. The Nuclear Regulatory Commission (NRC) has had specific and dose-based standards for the release of liquids and gases for several decades, but no regulatory mechanisms for the release of solid materials from a nuclear power plant. Even though free releases of small quantities of solid materials continue under existing guidelines from operating plants, the regulatory void creates major difficulties for the bulk materials that result from decommissioning projects. For the nation's fleet of nuclear reactors the cost of this regulatory void could be as high as $10 billion. The NRC has recently resumed the enhanced rulemaking process that was originally initiated in 1999 but was deferred pending a study by the National Academy of Sciences (NAS)/National Research Council. The NAS report and recommendations were issued in March 2002 and the NRC decided in October 2002 to resume the rulemaking process. This paper provides an overview of the developments in this area. It specifically discusses the applicability of ANSI N13.12 as a consensus standard that should be seriously considered for adoption as a regulatory standard.

Devgun, Jas S., Ph.D.

2003-02-27T23:59:59.000Z

457

Infrared birefringence imaging of residual stress and bulk defects in multicrystalline silicon  

SciTech Connect

This manuscript concerns the application of infrared birefringence imaging (IBI) to quantify macroscopic and microscopic internal stresses in multicrystalline silicon (mc-Si) solar cell materials. We review progress to date, and advance four closely related topics. (1) We present a method to decouple macroscopic thermally-induced residual stresses and microscopic bulk defect related stresses. In contrast to previous reports, thermally-induced residual stresses in wafer-sized samples are generally found to be less than 5 MPa, while defect-related stresses can be several times larger. (2) We describe the unique IR birefringence signatures, including stress magnitudes and directions, of common microdefects in mc-Si solar cell materials including: {beta}-SiC and {beta}-Si{sub 3}N{sub 4} microdefects, twin bands, nontwin grain boundaries, and dislocation bands. In certain defects, local stresses up to 40 MPa can be present. (3) We relate observed stresses to other topics of interest in solar cell manufacturing, including transition metal precipitation, wafer mechanical strength, and minority carrier lifetime. (4) We discuss the potential of IBI as a quality-control technique in industrial solar cell manufacturing.

Ganapati, Vidya; Schoenfelder, Stephan; Castellanos, Sergio; Oener, Sebastian; Koepge, Ringo; Sampson, Aaron; Marcus, Matthew A.; Lai, Barry; Morhenn, Humphrey; Hahn, Giso; Bagdahn, Joerg; Buonassisi1, Tonio

2010-05-05T23:59:59.000Z

458

Graviton Emission in the Bulk by a Simply Rotating Black Hole  

E-Print Network (OSTI)

In this work, we study the emission of tensor-type gravitational degrees of freedom from a higher-dimensional, simply rotating black hole in the bulk. The decoupled radial part of the corresponding field equation is first solved analytically in the limit of low-energy emitted particles and low-angular momentum of the black hole in order to derive the absorption probability. Both the angular and radial equations are then solved numerically, and the comparison of the analytical and numerical results show a very good agreement in the low and intermediate energy regimes. By using our exact, numerical results we compute the energy and angular momentum emission rates and their dependence on the spacetime parameters such as the number of additional spacelike dimensions and the angular momentum of the black hole. Particular care is given to the convergence of our results in terms of the number of modes taken into account in the calculation, and the multiplicity of graviton tensor modes that correspond to the same angular-momentum numbers.

P. Kanti; Hideo Kodama; R. A. Konoplya; N. Pappas; A. Zhidenko

2010-06-07T23:59:59.000Z

459

Bulk YBCO seeded with 45°–45° bridge-seeds of different lengths  

Science Journals Connector (OSTI)

Single grain, (RE)BCO (rare earth–barium–copper oxide) bulk superconductors in large or complicated geometries are required for a variety of potential applications, such as in motors and generators and magnetic shielding devices. As a result, top, multi-seeded, melt growth has been investigated over the past 15 years in an attempt to enlarge the size of (RE)BCO single grains specifically for such applications. Of these multi-seeding techniques, so-called bridge-seeding provides the best alignment of two seeds in a single grain growth process. Here we report, for the first time, the successful growth of YBCO (yttrium–barium–copper oxide) using a special, 45°–45°, arrangement of bridge-seeds. The superconducting properties, including trapped field, of the multi-seeded YBCO grains have been measured for different bridge lengths of the 45°–45° bridge-seeds. The boundaries at the impinging growth front and the growth features of the top, multi-seeded surface and cross-section of the multi-seeded, samples have been analysed using optical microscopy. The results suggest that an impurity-free boundary between the two seeds of each leg of the bridge-seed can form when 45°–45° bridge-seeds are used to enlarge the size of YBCO grains.

Y-H Shi; J H Durrell; A R Dennis; D A Cardwell

2013-01-01T23:59:59.000Z

460

Thermal and Bulk Comptonization in Accretion-powered X-Ray Pulsars  

Science Journals Connector (OSTI)

We develop a new theoretical model for the spectral formation process in accretion-powered X-ray pulsars based on a detailed treatment of the bulk and thermal Comptonization occurring in the accreting, shocked gas. A rigorous eigenfunction expansion method is employed to obtain the analytical solution for the Green's function describing the scattering of radiation injected into the column from a monochromatic source located at an arbitrary height above the stellar surface. The emergent spectrum is calculated by convolving the Green's function with source terms corresponding to bremsstrahlung, cyclotron, and blackbody emission. The energization of the photons in the shock, combined with cyclotron absorption, naturally produces an X-ray spectrum with a relatively flat continuum shape and a high-energy quasi-exponential cutoff. We demonstrate that the new theory successfully reproduces the phase-averaged spectra of the bright pulsars Her X-1, LMC X-4, and Cen X-3. In these luminous sources, it is shown that the emergent spectra are dominated by Comptonized bremsstrahlung emission.

Peter A. Becker; Michael T. Wolff

2007-01-01T23:59:59.000Z

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461

In-situ ductile metal/bulk metallic glass matrix composites formed by chemical partitioning  

DOE Patents (OSTI)

A composite metal object comprises ductile crystalline metal particles in an amorphous metal matrix. An alloy is heated above its liquidus temperature. Upon cooling from the high temperature melt, the alloy chemically partitions, forming dendrites in the melt. Upon cooling the remaining liquid below the glass transition temperature it freezes to the amorphous state, producing a two-phase microstructure containing crystalline particles in an amorphous metal matrix. The ductile metal particles have a size in the range of from 0.1 to 15 micrometers and spacing in the range of from 0.1 to 20 micrometers. Preferably, the particle size is in the range of from 0.5 to 8 micrometers and spacing is in the range of from 1 to 10 micrometers. The volume proportion of particles is in the range of from 5 to 50% and preferably 15 to 35%. Differential cooling can produce oriented dendrites of ductile metal phase in an amorphous matrix. Examples are given in the Zr--Ti--Cu--Ni--Be alloy bulk glass forming system with added niobium.

Kim, Choong Paul (Northridge, CA); Hays, Charles C. (Pasadena, CA); Johnson, William L. (Pasadena, CA)

2007-07-17T23:59:59.000Z

462

Metallic magnetism and change of conductivity in the nano to bulk transition of cobalt ferrite  

SciTech Connect

Variations in conductivity with particle size have been observed in cobalt ferrite, when synthesized by solgel auto-combustion method. Impedance analysis reveals metallic and semiconducting behavior at room temperature for a particle size of 6?nm and 52?nm, respectively. Upon thermal activation, metallic to semiconducting phase transition has been observed as a function of particle size and vice-versa. Grainboundary Resistance (R{sub gb}), increased drastically with particle size (19?M? for 6?nm and 259?M? for 52?nm) at room temperature. AC conductivity and dielectric constants exhibit similar metallic to semiconducting phase transition at 6?nm and semiconducting behavior at 52?nm with temperature in the selected frequencies. Enhanced magnetic moment with an increase in the grain size along with decreased coercivity (1444?G to 1146?G) reveals transition from single domain to multi-domain. Increased inter-particle interaction is responsible for metallicity at the nano level and on the contrary semiconductivity is attributed to bulk.

Arunkumar, A.; Vanidha, D.; Kannan, R., E-mail: kannan@pec.edu [Department of Physics, Pondicherry Engineering College, Puducherry–605 014 (India); Oudayakumar, K. [Department of Physics, Sri Manakula Vinayagar Engineering College, Puducherry–605 107 (India); Rajagopan, S. [Department of Chemistry, Pondicherry Engineering College, Puducherry–605 014 (India)

2013-11-14T23:59:59.000Z

463

Roles of nanoclusters in shear banding and plastic deformation of bulk metallic glasses  

SciTech Connect

During the course of this research we published 33 papers in various physics/material journals. We select four representing papers in this report and their results are summarized as follows. I. To study shear banding process, it is pertinent to know the intrinsic shear strain rate within a propagating shear band. To this aim, we used nanoindentation technique to probe the mechanical response of a Au49Ag5.5Pd2.3Cu26.9Si16.3 bulk metallic glass in locality and found notable pop-in events associated with shear band emission. Using a free volume model and under the situation when temperature and stress/hardness are fixed result in an equation, which predicts that hardness serration caused by pop-in decreases exponentially with the strain rate. Our data are in good agreement with the prediction. The result also predicts that, when strain rate is higher than a critical strain rate of 1700 s^-1, there will be no hardness serration, thereby no pop-in. In other words, multiple shear bandings will take place and material will flow homogeneously. The critical strain rate of 1700 s^-1 can be treated as the intrinsic strain rate within a shear band. We subsequently carried out a simulation study and showed that, if the imposed strain rate was over , the shear band spacing would become so small that the entire sample would virtually behave like one major shear band. Using the datum strain rate =1700 s^-1 and based on a shear band nucleation model proposed by us, the size of a shear-band nucleus in Au-BMG was estimated to be 3 ���� 10^6 atoms, or a sphere of ~30 nm in diameter. II. Inspired by the peculiar result published in a Science article �¢����Super Plastic Bulk Metallic Glasses at Room Temperature�¢���, we synthesized the Zr-based bulk metallic glass with a composition identical to that in the paper (Zr64.13Cu15.75Ni10.12Al10) and, subsequently, tested in compression at the same slow strain rate (~10^-4 s^-1). We found that the dominant deformation mode is always single shear. The stress-strain curve exhibited serrated pattern in the plastic region, which conventionally has been attributed to individual shear band propagation. The scanning electron micrographs taken from the deformed sample surface revealed regularly spaced striations. Analysis indicates that the observed stress-strain serrations are intimately related to the striations on the shear surface, suggesting the serrations were actually caused slip-and-stick shear along the principal shear plane. We further use video camera to conduct in situ compression experiments to unambiguously confirm the one-to-one temporal and spatial correspondence between the intermittent sliding and flow serration. This preferential shear band formation along the principal shear plane is, in fact, a natural consequence of Mode II crack, independent of strain softening or hardening, usually claimed in the literature. III. Flow serration in compression of metallic glasses is caused by the formation and propagation of localized shear bands. These shear bands propagate at an extremely high speed, so high that a load cell and load frame were unable to capture the details of the dynamic event. To subdue this problem, we conducted uniaxial compression on Zr64.13Cu15.75Ni10.12Al10 bulk metallic glass using a high-speed camera to capture the sample image and also high-sensitivity strain gauges attached to the test samples to directly measure the strain. The displacement-time curves obtained from the test and a magnified version of the displacement burst reveals clearly a three-step (acceleration, steady-state, and deceleration) process during shear band propagation. The fastest propagating speed occurring at the steady state is calculated as 8����10^2 ���µm/s. This speed is about 1,000 times faster than the crosshead speed. This explains the gradual disappearance of flow serration at higher strain rates previously reported during compression of

Nieh, T.G.

2012-07-31T23:59:59.000Z

464

Bulk thermodynamics and charge fluctuations at non-vanishing baryon density  

E-Print Network (OSTI)

We present results on bulk thermodynamic quantities as well as net baryon number, strangeness and electric charge fluctuations in QCD at non-zero density and temperature obtained from lattice calculations with almost physical quark masses for two values of the lattice cut-off $aT=1/4$ and 1/6 . We show that with our improved p4fa3-action the cut-off effects are under control when using lattices with a temporal extent of 6 or larger and that the contribution to the equation of state, which is due to a finite chemical potential is small for $\\mu_q/T<1$. Moreover, at vanishing chemical potential, i.e. under conditions almost realized at RHIC and the LHC, quartic fluctuations of net baryon number and strangeness are large in a narrow temperature interval characterizing the transition region from the low to high temperature phase. At non-zero baryon number density, strangeness fluctuations are enhanced and correlated to fluctuations of the net baryon number. If strangeness is furthermore forced to vanish, as it may be the case in systems created in heavy ion collisions, strangeness fluctuations are significantly smaller than baryon number fluctuations.

Chuan Miao; Christian Schmidt

2007-10-23T23:59:59.000Z

465

A study of radiation damage effects on the magnetic structure of bulk Iron  

SciTech Connect

Defects, defect interactions, and defect dynamics in solids created by fast neutrons are known to have significant impact on the performance and lifetime of structural materials. A fundamental understanding of the radiation damage effects in solids is therefore of great importance in assisting the development of improved materials - materials with ultrahigh strength, toughness, and radiation resistance. In this presentation, we show our recent theoretical investigation on the magnetic structure evolution of bulk iron in the region of the radiation defects. We applied a linear scaling ab-initio method based on density functional theory with local spin density approximation, namely the locally self-consistent multiple scattering method (LSMS), to the study of magnetic moment distributions in a cascade at the damage peak and for a series of time steps as the interstitials and vacancies recombined. Atomic positions correspond to those in a low energy cascade in a 10|000 atom sample, in which the primary damage state and the evolution of all defects produced were simulated using molecular dynamics with empirical, embedded-atom inter-atomic potentials. We will discuss how a region of affected moments expands and then recedes in response to a cascade evolution.

Wang Yang [Pittsburgh Supercomputing Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States); Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Nicholson, D. M. C.; Stocks, G. M.; Rusanu, Aurelian; Eisenbach, Markus; Stoller, R. E. [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

2011-04-01T23:59:59.000Z

466

MSSM dark matter and a light slepton sector: The Incredible Bulk  

E-Print Network (OSTI)

Recent experimental results from the LHC have placed strong constraints on the masses of colored superpartners. The MSSM parameter space is also constrained by the measurement of the Higgs boson mass, and the requirement that the relic density of lightest neutralinos be consistent with observations. Although large regions of the MSSM parameter space can be excluded by these combined bounds, leptophilic versions of the MSSM can survive these constraints. In this paper we consider a scenario in which the requirements of minimal flavor violation, vanishing $CP$-violation, and mass universality are relaxed, specifically focusing on scenarios with light sleptons. We find a large region of parameter space, analogous to the original bulk region, for which the lightest neutralino is a thermal relic with an abundance consistent with that of dark matter. We find that these leptophilic models are constrained by measurements of the magnetic and electric dipole moments of the electron and muon, and that these models have interesting signatures at a variety of indirect detection experiments.

Keita Fukushima; Chris Kelso; Jason Kumar; Pearl Sandick; Takahiro Yamamoto

2014-12-10T23:59:59.000Z

467

Corrosion and ion release behavior of ultra-fine grained bulk pure copper fabricated by ECAP in Hanks solution as potential biomaterial for contraception  

E-Print Network (OSTI)

Corrosion and ion release behavior of ultra-fine grained bulk pure copper fabricated by ECAP-fine grained copper ECAP Corrosion behavior Ion release Ultra-fine grained (UFG) bulk pure copper has been revealed that the corrosion current of UFG copper ishigherthan that of the coarse grained copper

Zheng, Yufeng

468

Quantum Monte Carlo benchmark of exchange-correlation functionals for bulk water  

SciTech Connect

The accurate description of the thermodynamic and dynamical properties of liquid water from first-principles is a very important challenge to the theoretical community. This represents not only a critical test of the predictive capabilities of first-principles methods, but it will also shed light into the microscopic properties of such an important substance. Density Functional Theory, the main workhorse in the field of first-principles methods, has been so far unable to properly describe water and its unusual properties in the liquid state. With the recent introduction of exact exchange and an improved description of dispersion interaction, the possibility of an accurate description of the liquid is finally within reach. Unfortunately, there is still no way to systematically improve exchange-correlation functionals and the number of available functionals is very large. In this article we use highly accurate quantum Monte Carlo calculations to benchmark a selection of exchange-correlation functionals typically used in Density Functional Theory simulations of bulk water. This allows us to test the predictive capabilities of these functionals in water, giving us a way not only to choose optimal functionals for first-principles simulations, but also giving us a route for the optimization of the functionals for the system at hand. We compare and contrast the importance of different features of functionals, including the hybrid component, the vdW component, and their importance within different aspects of the PES. In addition, we test a recently introduce scheme that combines Density Functional Theory with Coupled Cluster Calculations through a Many-Body expansion of the energy, in order to correct the inaccuracies in the description of short range interactions in the liquid.

Morales, Miguel A [Lawrence Livermore National Laboratory (LLNL); Gergely, John [University of Illinois, Urbana-Champaign; McMinis, Jeremy [Lawrence Livermore National Laboratory (LLNL); McMahon, Jeffrey [University of Illinois, Urbana-Champaign; Kim, Jeongnim [ORNL; Ceperley, David M. [University of Illinois, Urbana-Champaign

2014-01-01T23:59:59.000Z

469

ORCED: A model to simulate the operations and costs of bulk-power markets  

SciTech Connect

Dramatic changes in the structure and operation of US bulk-power markets require new analytical tools. The authors developed the Oak Ridge Competitive Electricity Dispatch (ORCED) model to analyze a variety of public-policy issues related to the many changes underway in the US electricity industry. Such issues include: policy and technology options to reduce carbon emissions from electricity production; the effects of electricity trading between high- and low-cost regions on consumers and producers in both regions; the ability of the owners of certain generating units to exercise market power as functions of the transmission link between two regions and the characteristics of the generating units and loads in each region; and the market penetration of new energy-production and energy-use technologies and the effects of their adoption on fuel use, electricity use and costs, and carbon emissions. ORCED treats two electrical systems connected by a single transmission link ORCED uses two load-duration curves to represent the time-varying electricity consumption in each region. The two curves represent peak and offpeak seasons. User specification of demand elasticities permits ORCED to estimate the effects of changes in electricity price, both overall and hour by hour, on overall electricity use and load shapes. ORCED represents the electricity supply in each region with 26 generating units. The two regions are connected by a single transmission link. This link is characterized by its capacity (MW), cost ({cents}/kWh), and losses (%). This report explains the inputs to, outputs from, and operation of ORCED. It also presents four examples showing applications of the model to various public-policy issues related to restructuring of the US electricity industry.

Hadley, S.; Hirst, E.

1998-06-01T23:59:59.000Z

470

Effect of high strain rates on peak stress in a Zr-based bulk metallic glass  

SciTech Connect

The mechanical behavior of Zr{sub 41.25}Ti{sub 13.75}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5} (LM-1) has been extensively characterized under quasistatic loading conditions; however, its mechanical behavior under dynamic loading conditions is currently not well understood. A Split-Hopkinson pressure bar (SHPB) and a single-stage gas gun are employed to characterize the mechanical behavior of LM-1 in the strain-rate regime of 10{sup 2}-10{sup 5}/s. The SHPB experiments are conducted with a tapered insert design to mitigate the effects of stress concentrations and preferential failure at the specimen-insert interface. The higher strain-rate plate-impact compression-and-shear experiments are conducted by impacting a thick tungsten carbide (WC) flyer plate with a sandwich sample comprising a thin bulk metallic glass specimen between two thicker WC target plates. Specimens employed in the SHPB experiments failed in the gage-section at a peak stress of approximately 1.8 GPa. Specimens in the high strain-rate plate-impact experiments exhibited a flow stress in shear of approximately 0.9 GPa, regardless of the shear strain-rate. The flow stress under the plate-impact conditions was converted to an equivalent flow stress under uniaxial compression by assuming a von Mises-like material behavior and accounting for the plane strain conditions. The results of these experiments, when compared to the previous work conducted at quasistatic loading rates, indicate that the peak stress of LM-1 is essentially strain rate independent over the strain-rate range up to 10{sup 5}/s.

Sunny, George; Yuan Fuping; Prakash, Vikas [Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7222 (United States); Lewandowski, John [Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7222 (United States)

2008-11-01T23:59:59.000Z

471

The influence of bi-metal interfaces on deformation mechanisms in bulk nanolaminar composites  

SciTech Connect

In this presentation, we report on the plastic deformation mechanisms in Ag-Cu and Cu-Nb nanocomposites rolled to large reductions. Starting with an Ag-Cu alloy with eutectic lamellar bilayer thickness of 200 nm, we roll the as-cast rods from 9.5 mm diameter to sheets of final thickness varying from 2.4 mm to 500 {micro}m, corresponding to 75% to 95% nominal reduction in thickness. Cu(111) X-ray pole figures of the rolled nanocomposites indicate a measured texture similar to that of Ag but different from that expected during rolling of pure bulk Cu involving dislocation slip alone. Visco-Plastic Self Consistent (VPSC) polycrystal modeling indicate that both silver and copper deformed by slip and twinning and the twin fraction reached over 30%, depending on rolling reduction. Because pure Cu is not expected to twin under these processing conditions, we hypothesize that twinning in Cu is induced by twinning in Ag, aided by the presence of high Ag-Cu interfacial content. Molecular Dynamics (MD) simulations are then carried out on perfect and defective Ag-Cu interfaces and the results support this hypothesis. In the Cu-Nb system, it has been found that at individual layer thicknesses of 40 nm and above, physical vapor deposited foils can be rolled to large strains. However, when the layer thickness decreases to {approx}5nm, shear instability during rolling limits ductility. In this work, we show the effects of cladding 5nm CuINb multilayers with 40 nm CuINb multilayers to limit the onset of geometric instability, thereby facilitating the deformation of 5nm Cu/Nb multi layers to large rolling strains. Results will be discussed in terms of the effects of the interface on deformation processes at diminishing length scales.

Mara, Nathan Allan [Los Alamos National Laboratory; Ledonne, Jon [Los Alamos National Laboratory; Wynn, Thomas A [Los Alamos National Laboratory; Rollett, Anthony D [Los Alamos National Laboratory; Beyerlein, I. J. [Los Alamos National Laboratory; Misra, Amit [Los Alamos National Laboratory

2011-01-04T23:59:59.000Z

472

Ultrasound and nuclear magnetism in bulk and confined liquid sup 3 He  

SciTech Connect

Two different experiments on liquid {sup 3}He in open and confined geometries were performed. In the first, the attenuation and velocity of 5 MHz ultra-sound were measured in both the bulk normal and superfluid phases as a function of temperature (0.3 to 30 mK) and pressure (0.3 to 34 bars). The zero temperature limiting behavior was observed in the B-phase superfluid at temperatures below T/{Tc} = 0.4. The velocity was found to return to its ordinary first-sound value as was theoretically expected. Using precise measurements of the difference between the zero-and first-sound velocities, the second symmetric Landau parameter, F{sub 2}{sup s}, was deduced as a function of pressure. In the other experiment, nuclear magnetic resonance (NMR) was used to probe the magnetic susceptibility, {chi}, transverse spin dephasing time, {tau}{sub 2}, and spin-lattice relaxation time, {tau}{sub 1}. Measurements were performed as a function of temperature (0.3 mK to 2K), pressure (0 to 9 bars), and frequency (231,345,462,692, and 924 kHz). The magnetic susceptibility was found to obey a Curie-Weiss law with a pressure-dependent ferromagnetic Weiss temperature. The spin dephasing time was found to be a strong function of temperature at low temperature, with its slope determined by the resonance frequency. This frequency dependence of {tau}{sub 2} was exploited, using a simple model, to obtain the true spin-spin relaxation time, {tau}{sub 2}, as a function of temperature. This was found to obey the same inverse temperature dependence as the susceptibility, diverging at the extrapolated ferromagnetic transition.

Engel, B.N.

1988-01-01T23:59:59.000Z

473

Process parameters, orientation, and functional properties of melt-processed bulk Y-Ba-Cu-O superconductors  

SciTech Connect

This study compared the microstructure, texturing, and functional properties (critical currents) of YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}-based bulk pellets that were prepared by the quench-melt-growth-process (QMGP), melt-textured growth (MTG), and conventional solid-state reaction (SSR) approaches. Using two X-ray diffraction (XRD) methods, {theta}-2{theta}, and rocking curves, the authors found that the individual grains of two melt-processed pellets exhibited remarkable preferred orientational alignment (best rocking curve width = 3.2{degree}). However, the direction of the preferred orientation among the grains was random. Among the three types of bulk materials studied, the QMGP sample was found to have the best J{sub c} values, {approx} 4,500 A/cm{sup 2} at 77 K in a field of 2 kG, as determined from SQUID magnetic data.

Zakharchenko, I.V.; Terryll, K.M.; Rao, K.V. [Royal Inst. of Tech., Stockholm (Sweden). Dept. of Condensed Matter Physics; Balachandran, U. [Argonne National Lab., IL (United States). Energy Technology Div.

1995-03-01T23:59:59.000Z

474

Classical Tests of General Relativity: Probing Topologically Charged Black Holes on Brane Worlds in f(R) Bulk  

E-Print Network (OSTI)

The perihelion precession, the deflection of light, and the radar echo delay are classical tests of General Relativity here used to probe brane world topologically charged black holes in a f(R) bulk and to constrain the parameter that arises from the Shiromizu-Maeda-Sasaki procedure applied to a f(R) bulk as well. The existing Solar system observational data constrain the possible values of the tidal charge parameter and the effective cosmological constant including f(R) brane world effects. We show that the observational/experimental data for both perihelion precession and radar echo delay make the black hole space of parameters to be more strict than the ones for the Dadhich, Maartens, Papadopoulos and Rezania (DMPR) black hole geometry. Furthermore, the deflection of light constrains the tidal charge parameter similarly as the DMPR black holes due to a peculiarity in the equation of motion.

Roldao da Rocha; A. M. Kuerten

2014-07-08T23:59:59.000Z

475

Femtosecond and coherent effects in bulk CdSe and CdSexS1-x doped glasses  

E-Print Network (OSTI)

researchers have produced crystallites of CdS, CdSe and CuCI, as small at 12 A in diameter, with relatively1711 Femtosecond and coherent effects in bulk CdSe and CdSexS1-x doped glasses N. Peyghambarian-1715 DÃ?CEMBRE 1987, PAGE 1711 Classification Physics Abstracts 42.65 - 42.70G Glasses doped with Cd

Boyer, Edmond

476

DEVELOPMENT OF A TAMPER RESISTANT/INDICATING AEROSOL COLLECTION SYSTEM FOR ENVIRONMENTAL SAMPLING AT BULK HANDLING FACILITIES  

SciTech Connect

Environmental sampling has become a key component of International Atomic Energy Agency (IAEA) safeguards approaches since its approval for use in 1996. Environmental sampling supports the IAEA's mission of drawing conclusions concerning the absence of undeclared nuclear material or nuclear activities in a Nation State. Swipe sampling is the most commonly used method for the collection of environmental samples from bulk handling facilities. However, augmenting swipe samples with an air monitoring system, which could continuously draw samples from the environment of bulk handling facilities, could improve the possibility of the detection of undeclared activities. Continuous sampling offers the opportunity to collect airborne materials before they settle onto surfaces which can be decontaminated, taken into existing duct work, filtered by plant ventilation, or escape via alternate pathways (i.e. drains, doors). Researchers at the Savannah River National Laboratory and Oak Ridge National Laboratory have been working to further develop an aerosol collection technology that could be installed at IAEA safeguarded bulk handling facilities. The addition of this technology may reduce the number of IAEA inspector visits required to effectively collect samples. The principal sample collection device is a patented Aerosol Contaminant Extractor (ACE) which utilizes electrostatic precipitation principles to deposit particulates onto selected substrates. Recent work has focused on comparing traditional swipe sampling to samples collected via an ACE system, and incorporating tamper resistant and tamper indicating (TRI) technologies into the ACE system. Development of a TRI-ACE system would allow collection of samples at uranium/plutonium bulk handling facilities in a manner that ensures sample integrity and could be an important addition to the international nuclear safeguards inspector's toolkit. This work was supported by the Next Generation Safeguards Initiative (NGSI), Office of Nonproliferation and International Security (NIS), National Nuclear Security Administration (NNSA).

Sexton, L.

2012-06-06T23:59:59.000Z

477

'Magnetoscan': a modified Hall probe scanning technique for the detection of inhomogeneities in bulk high temperature superconductors  

Science Journals Connector (OSTI)

We present a novel technique for the investigation of local variations of the critical current density in large bulk superconductors. In contrast to the usual Hall probe scanning technique, the sample is not magnetized as a whole before the scan, but locally by a small permanent magnet, which is fixed near the Hall probe, during the scanning process. The resulting signal can be interpreted as a qualitative measure of the local shielding currents flowing at the surface.

M Eisterer; S Haindl; T Wojcik; H W Weber

2003-01-01T23:59:59.000Z

478

Two-dimensional Vlasov solution for a collisionless plasma jet across transverse magnetic field lines with a sheared bulk velocity  

Science Journals Connector (OSTI)

We consider a two-dimensional (2D) stationary stream of a collisionless plasma injected across an external stationary magnetic field and a background stagnant plasma. The solution is found by solving the Vlasov equation for each species (electrons and protons), the Maxwell-Ampere equation for the magnetic vector potential, and the equation of plasma quasineutrality for the electrostatic potential. The solution of the stationary Vlasov equation is given in terms of two constants of motion and one adiabatic invariant. The partial charge and current densities are given by analytical expressions of the moments of the velocity distribution functions for each particle species. The 2D distribution of the plasma bulk velocity, Vx(y,z), is roughly uniform inside the jet. There is no plasma bulk flow in the direction of the magnetic field. Inside the boundary layer interfacing the jet and the stagnant plasma, the bulk velocity has gradients (i.e., shears) in the direction parallel as well perpendicular to the magnetic field. The parallel component of this gradient, ??V?, produces a nonzero electric field component parallel to the magnetic field lines, E?B?0. The parallel electric field within the transition layer is a basic element allowing plasma elements to be transported across magnetic field lines in astrophysical systems as well as in laboratory experiments where plasmoids are injected across magnetic fields.

Marius M. Echim and Joseph F. Lemaire

2005-09-13T23:59:59.000Z

479

Control of Y2BaCuO5 particle formation in bulk, single grain Y–Ba–Cu–O  

Science Journals Connector (OSTI)

The trapped field of undoped, bulk, single grain Y–Ba–Cu–O (YBCO) fabricated by top seeded melt growth (TSMG) has been measured to investigate the field generating potential of this material. Bulk samples were prepared from precursor powders that incorporated Y2O3 of particle size 20–50 nm, rather than Y2BaCuO5 (Y-211), which is used more commonly, in order to introduce nano-Y-211 inclusions in the superconducting YBa2Cu3Oy (Y-123) matrix. Relatively small bulk samples of diameter 20 mm processed from this precursor are observed to trap a peak magnetic flux density of nearly 0.8 T at 77 K. This is the first time that such a trapped field of this magnitude has been observed in undoped YBCO (i.e. in the absence of chemical additions). The increase in trapped field is accompanied by an associated enhancement in Jc by up to a factor of five over the applied magnetic field up to 4 T at 77 K compared to standard single grain YBCO fabricated from precursor powders that contain the Y-211 phase.

W K Yeoh; S K Pathak; Y-H Shi; A R Dennis; D A Cardwell; N Hari Babu; K Iida; M Strasik

2009-01-01T23:59:59.000Z

480

Control filamentous bulking caused by chlorine-resistant Type 021N bacteria through adding a biocide CTAB  

Science Journals Connector (OSTI)

Filamentous bulking sludge due to excessive growth of filamentous bacteria is a serious operational problem in activated sludge plants. The addition of chemicals is one of widespread ways to control filamentous bulking. In this study, filamentous bulking in a continuous activated sludge system was found to be mainly caused by Eikelboom Type 021N filamentous bacteria likely due to low substrate concentration gradients. These Type 021N bacteria were found to be resistant to chlorination, maintaining cell integrity at a dosage of up to 80 mg Cl/gSS. An alternative biocidal agent, cetyltrimethyl ammonium bromide (CTAB), exhibited a much stronger biocidal effect on these filaments, which significantly improved sludge settleability. Type 021N with filamentous index of 5 was selectively killed, but floc-formers recovery their activity after CTAB termination. The study implied that CTAB might have more penetration capacity to cell wall of chlorine-resistant Type 021N bacteria. We therefore suggest the penetration property of filament cell wall should be considered or tested before the selection of biocide type in practice.

Jianhua Guo; Yongzhen Peng; Zhongwei Wang; Zhiguo Yuan; Xiong Yang; Shuying Wang

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "bulk heterojunction bhj" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


481

Effect of milling time on magnetic properties and structures of bulk Sm-Co/{alpha}-(Fe, Co) nanocomposite magnets  

SciTech Connect

Bulk Sm-Co/{alpha}-(Fe,Co) nanocomposite magnets were fabricated by hot pressing composite powders prepared by high-energy ball milling of magnetically hard SmCo{sub 5} powder and magnetically soft Fe powder. The bulk magnets had a nanocomposite structure consisting of Sm-Co matrix (1:5 H and 1:7 H phases) and {alpha}-(Fe,Co) phases. The Fe-Co particles were distributed uniformly in the Sm-Co matrix. The milling time strongly affects the structures and the magnetic properties of the bulk magnets. Increasing milling time led to a decrease of the amount of 1:5 H phase, an increase in the phase fraction of the 1:7 H phase, and a decrease in the amount of soft phase, which resulted in an increase in magnetization and a decrease in coercivity. Scanning electron microscopy (SEM)/energy dispersive spectroscopy (EDS) analyses revealed that inter-diffusion took place between the Sm-Co matrix and Fe particles during the processing.

Shen, Y. [UDRI, University of Dayton, Dayton, Ohio 45469 (United States); AFRL, Wright-Patterson Air Force Base, Ohio 45433 (United States); Huang, M. Q.; Turgut, Z. [AFRL, Wright-Patterson Air Force Base, Ohio 45433 (United States); UES Inc., Dayton, Ohio 45432 (United States); Lucas, M. S. [AFRL, Wright-Patterson Air Force Base, Ohio 45433 (United States); UTC, Dayton, Ohio 45432 (United States); Michel, E. [AFRL, Wright-Patterson Air Force Base, Ohio 45433 (United States); Wright State University, Dayton, Ohio 45435 (United States); Horwath, J. C. [AFRL, Wright-Patterson Air Force Base, Ohio 45433 (United States)

2012-04-01T23:59:59.000Z

482

The renaissance of hybrid solar cells: progresses, challenges, and perspectives  

E-Print Network (OSTI)

understanding of optoelectronic interactions in organic–inorganic hybrid systems. In this article, we review the state-of-the-art progress in hybrid bulk heterojunction solar cells, covering new materials design, interfacial interaction, and processing control...

Feng, Gao; Ren, Shenqiang; Jianpu, Wang

2013-06-12T23:59:59.000Z

483

Journal Covers  

NLE Websites -- All DOE Office Websites (Extended Search)

Journal Covers The influence of molecular orientation on organic bulk heterojunction solar cells Print Monday, 28 April 2014 09:03 Work done on ALS Beamlines 11.0.1.2, 7.3.3,...

484

High-performance organic solar cells based on a low-bandgap poly-thienothiophene-benzodithiophene polymer and fullerene composite prepared by using the airbrush spray-coating technique  

Science Journals Connector (OSTI)

In the present work, we have demonstrated high-performance organic solar cells with spray coated active layers. The influence ... butyric acid (PC71BM) methyl ester bulk heterojunction solar cells is presented. A...

Palanisamy Kumar; Santhakumar Kannappan…

2013-04-01T23:59:59.000Z

485

The Design of Organic Polymers and Small Molecules to Improve the Efficiency of Excitonic Solar Cells  

E-Print Network (OSTI)

bulk heterojunction organic solar cells, blends of a p-typecells, including organic solar cells and dye-sensitizedin a bilayer organic solar cell. At top is a cross section

Armstrong, Paul Barber

2010-01-01T23:59:59.000Z

486

Optimum ratio of electron-to-hole mobility in P3HT:PCBM organic solar cells  

Science Journals Connector (OSTI)

We investigate the influence of different electron-to-hole mobility ratios on the performance of a P3HT:PCBM bulk heterojunction organic solar cell by using numerical simulations. We show that...

Omar Ramírez; Víctor Cabrera; Luis Martín Reséndiz

2014-10-01T23:59:59.000Z

487

Solvent effects on gravure-printed organic layers of nanoscale thickness for organic solar cells  

Science Journals Connector (OSTI)

The effects of different solvents on the fabrication of organic photovoltaic cells by gravure printing are reported. Polymer bulk heterojunction solar cells were fabricated with ITO/PEDOT: PSS/P3HT ... of solvent...

Jiyeon Lee; Aran Kim; Sung Min Cho; Heeyeop Chae

2012-03-01T23:59:59.000Z

488

Semitransparent organic solar cells  

Science Journals Connector (OSTI)

The organic solar cell technology has attracted great interests due to ... low cost solution process capability. Bulk heterojunction organic solar cells offer a potentially much cheaper alternative way to harness...

Furong Zhu

2014-03-01T23:59:59.000Z

489

Metallic Nanoantennae and their Use in Organic-Polymer Photovoltaics  

Science Journals Connector (OSTI)

Organic photovoltaics, particularly bulk heterojunction devices, have shown...1, 2]. One of the main limitations of these designs is the low charge carrier mobility of the polymer blend. This leads to losses due ...

Eric Peterson; Patrick N. Sisco; Catherine J. Murphy…

2011-03-01T23:59:59.000Z

490

Thermal stability of organic solar cells: the decay in photocurrent linked with changes in active layer morphology  

Science Journals Connector (OSTI)

Nowadays bulk heterojunction polymer:fullerene (PCBM) solar cells reach efficiencies of 5% through the ... . One of the general bottlenecks of organic solar cells is their poor stability. Organic solar cells have...

S. Bertho; I. Haeldermans; A. Swinnen…

2008-01-01T23:59:59.000Z

491

Bulk Power System Dynamics and Control -VII, August 19-24 2007, Charleston, South Carolina, USA Towards Quantifying Cascading Blackout Risk  

E-Print Network (OSTI)

Bulk Power System Dynamics and Control - VII, August 19-24 2007, Charleston, South Carolina, USA Department, University of Wisconsin, Madison, WI 53706 USA Abstract Blackouts become widespread by initial

492

Density scaling of the diffusivity in viscous liquids: Identification of the scaling exponent with the pressure derivative of the isothermal bulk modulus  

E-Print Network (OSTI)

A density scaled diffusivity function for viscous liquids derived earlier [Phys. Rev. E 79, 032501 (2009)] is revisited, based on an improved equation of state assuming that the isothermal bulk modulus increases linearly with pressure. Without making any assumption on the interconnection between the scaling exponent and the Gruneisen parameter, we prove that the scaling exponent is identical with the pressure derivative of the isothermal bulk modulus. We further discuss probable interconnection between the scaling exponent and the Gruneisen parameter.meter.

Anthony N. Papathanassiou; Ilias Sakellis

2009-09-20T23:59:59.000Z

493

Phase behavior of carbon dioxide confined in silica aerogel in the vicinity of the bulk critical point  

SciTech Connect

The small angle neutron scattering intensities from silica aerogel filled with carbon dioxide at different loading densities of the bulk fluid (0.3-0.65 g/cm{sup 3}) were measured at fixed volume condition as a function of decreasing temperature, from 35 to 25 C, to characterize the phase behavior of the confined CO2 about the critical point of the bulk CO{sub 2}. The data present no evidence of a bulklike phase transition of the confined CO{sub 2} in the explored parameter region. They show that the confined CO{sub 2} may be approximated as a two phase system. The first phase (liquid film) is formed by CO{sub 2} molecules at the silica surface, and the second phase (confined fluid) fills up the rest of the pore volume. The thickness {delta} of the liquid film as well as the scattering-length densities of the two phases were obtained by analyzing the Porod invariants and the oscillations observed in the Porod plots at each loading density and temperature. The resulting {delta} values vary in the range 25-45 {angstrom} depending on the temperature and loading density. The density of the liquid film is 1.5-2 times larger than that of the confined fluid, which in its turn exceeds the density of bulk CO{sub 2} at similar temperature and pressure. At the lowest temperature (25 C), the densities of the liquid film and confined fluid respectively approach 1.25 g/cm{sup 3} and 0.8 g/cm{sup 3} independently of the loading conditions.

Ciccariello, Salvino [Universita di Padova; Melnichenko, Yuri B [ORNL; He, Lilin [ORNL

2011-01-01T23:59:59.000Z

494

Anomalous peak at low fields in the magnetization versus temperature curve in bulk ceramic high-temperature superconductors  

Science Journals Connector (OSTI)

When a bulk ceramic high-temperature superconductor is cooled in a small field and the magnetic moment of the sample is measured as the sample is warmed, an anomalous peak in the magnetic moment is observed. This peak can be as high as 50% of the low-temperature moment for fields less than 1 Oe, but it rapidly decreases as the magnetic field increases. We show that this anomaly is due to the interrelationship between flux trapping by intergranular weak links and the irreversible flux trapping properties of the superconducting grains as recently described by Hao and Clem.

J. P. Wang and W. C. H. Joiner

1994-07-01T23:59:59.000Z

495

“Giant” Enhancement of the Upper Critical Field and Fluctuations above the Bulk Tc in Superconducting Ultrathin Lead Nanowire Arrays  

Science Journals Connector (OSTI)

superconductivity; nanowires; mesoporous silica matrixes; thermodynamic properties; electric transport ... In a quasi-1D superconducting material thermally induced phase slips in the order parameter will cause finite resistance at T > 0 K.(15, 16) However, when many quasi-1D elements are parallel and form arrays, it was predicted from theory(17-24) and experimentally demonstrated(25, 26) that a 3D long-range-ordered state can be formed, if these elements are weakly coupled in the lateral plane. ... Bulk Pb is a well-known elementary superconductor with 83 nm coherence length. ...

Mingquan He; Chi Ho Wong; Pok Lam Tse; Yuan Zheng; Haijing Zhang; Frank L. Y. Lam; Ping Sheng; Xijun Hu; Rolf Lortz

2013-04-08T23:59:59.000Z

496

On the Klein-Gordon equation near a De Sitter brane in an Anti-de Sitter bulk  

E-Print Network (OSTI)

In this paper we investigate the Klein-Gordon equation in the past causal domain of a De Sitter brane imbedded in a Anti-de Sitter bulk. We solve the global mixed hyperbolic problem. We prove that any finite energy solution can be expressed as a Kaluza-Klein tower that is a superposition of free fields in the Steady State Universe, of which we study the asymptotic behaviours. We show that the leading term of a gravitational fluctuation is a massless graviton, i.e. the De Sitter brane is linearly stable.

Alain Bachelot

2014-02-05T23:59:59.000Z

497

Semiconductor heterojunction band offsets and charge neutrality  

E-Print Network (OSTI)

on semi- conductors A and B like Figure 3. 1, and commutativity of semiconductors A and B, i. e. , DEs(A ? B) = DE?(B ? A). (3. 33) We predict the charge neutrality levels &b, 4is and 4i, might align in semiconductors A, B and C as shown in Figure 3...

Lee, Chomsik

2012-06-07T23:59:59.000Z

498

CONSTRAINING THE BULK LORENTZ FACTOR OF GAMMA-RAY BURST OUTFLOW IN THE MAGNETIC-DOMINATED JET MODEL  

SciTech Connect

Recent observations by the Fermi-LAT showed that there are delayed arrivals of GeV photons relative to the onset of MeV photons in some gamma-ray bursts (GRBs). In order to avoid a large optical depth, the minimal value of the Lorentz factor has been estimated to be higher than 1000 in some of the brightest bursts. In this paper, we present a detailed calculation of the time delay between the MeV and GeV photons in the framework of the magnetic-dominated jet model. We find that the time delay strongly depends on the saturated bulk Lorentz factor of the jet. Inspired by this fact, we use this model to calculate the Lorentz factors of the four brightest Fermi bursts. The results indicate that the Lorentz factors are much smaller than those obtained from the 'single-zone' scenario. The short burst GRB 090510 has a minimal Lorentz factor of 385, while the three long bursts, GRB 080916c, GRB 090902b, and GRB 090926, have almost the same Lorentz factors with an average value near 260. Another interesting result is that, for long bursts, GeV photons are emitted after the bulk Lorentz factor saturates. For the short GRB, however, MeV and GeV photons are emitted at the same phase, i.e., either in the expansion phase or in the coasting phase.

Chang Zhe; Lin Hainan; Jiang Yunguo, E-mail: changz@ihep.ac.cn, E-mail: linhn@ihep.ac.cn, E-mail: jiangyg@ihep.ac.cn [Institute of High Energy Physics, Chinese Academy of Sciences, 100049 Beijing (China)

2012-11-10T23:59:59.000Z

499

Experimental determination of bulk modulus of 14 A tobermorite using high pressure synchrotron X-ray diffraction  

SciTech Connect

Using a diamond anvil cell, 14 A tobermorite, a structural analogue of calcium silicate hydrates (C-S-H), was examined by high-pressure synchrotron X-ray diffraction up to 4.8 GPa under hydrostatic conditions. The bulk modulus of 14 A tobermorite was calculated, K{sub o} = 47 GPa. Comparison of the current results with previous high pressure studies on C-S-H(I) indicates that: (1) the compression behavior of the lattice parameters a and b of 14 A tobermorite and C-S-H(I) are very similar, implying that both materials may have very similar Ca-O layers, and also implying that an introduction of structural defects into the Ca-O layers may not substantially change in-plane incompressibility of the ab plane of 14 A tobermorite; and (2) the bulk modulus values of 14 A tobermorite and C-S-H(I) are dominated by the incompressibility of the lattice parameter c, which is directly related to the interlayer spacing composed of dreierketten silicate chains, interlayer Ca, and water molecules.

Oh, Jae Eun [Department of Civil and Environmental Engineering, University of California, Berkeley, 94720, CA USA (United States); School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan Metropolitan City, 689-798 (Korea, Republic of); Clark, Simon M. [Department of Earth and Planetary Sciences, Maquarie University, Sydney, NSW 2109 (Australia); Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, 20015, CA (United States); Wenk, Hans-Rudolf [Department of Earth and Planetary Sciences, Maquarie University, Sydney, NSW 2109 (Australia); Monteiro, Paulo J.M., E-mail: monteiro@berkeley.edu [Department of Civil and Environmental Engineering, University of California, Berkeley, 94720, CA USA (United States)

2012-02-15T23:59:59.000Z

500

Growth of InGaAs and SiGe homogeneous bulk crystals which have complete miscibility in the phase diagrams  

Science Journals Connector (OSTI)

Growth of binary and ternary single crystals which have complete miscibility in the phase diagrams, have been studied by several newly developed methods such as the liquid encapsulated Czochralski, Bridgman, and multi-component zone melting methods for InGaAs bulk crystals, and the multi-component zone melting methods and Bridgman methods for Ge-rich and Si-rich SiGe bulk crystals. Crystals grown by these methods are compared with each other, to find the proper growth conditions to obtain single crystals with uniform composition. Techniques for the precise control of the temperature at the growing interface and for the continuous supply of the depleted solute elements to the growth melt were developed. InGaAs bulk crystals with uniform composition were obtained by the multicomponent zone melting method. Si-rich and Ge-rich SiGe bulk crystals with uniform composition were obtained in the Ge compositional range from 10 to 78%. The advanced technologies to obtain the InGaAs and SiGe bulk crystals with much higher-quality are discussed in this paper.

Kazuo Nakajima; Yukinaga Azuma; Noritaka Usami; Gen Sazaki; Toru Ujihara; Kozo Fujiwara; Toetsu Shishido; Yoshito Nishijima; Toshihiro Kusunoki

2005-01-01T23:59:59.000Z