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Note: This page contains sample records for the topic "te grated analy" from the National Library of EnergyBeta (NLEBeta).
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1

Tunable, oblique incidence resonant grating filter for telecommunications  

Science Journals Connector (OSTI)

We have designed a tunable, oblique-incidence resonant grating filter that covers the C band as an add-drop device for incident TE-polarized light. We tune the filter by tilting a...

Niederer, Guido; Herzig, Hans Peter; Shamir, Joseph; Thiele, Hans; Schnieper, Marc; Zschokke, Christian

2004-01-01T23:59:59.000Z

2

Are gratings invisible?  

Science Journals Connector (OSTI)

I show that laser grating accelerators may encounter serious difficulties in operating near or even below the damage threshold caused by the formation of a dense plasma above the grating which obscures the grating shape.

Paul J. Channell

1982-01-01T23:59:59.000Z

3

Multilayer dielectric diffraction gratings  

DOE Patents [OSTI]

The design and fabrication of dielectric grating structures with high diffraction efficiency used in reflection or transmission is described. By forming a multilayer structure of alternating index dielectric materials and placing a grating structure on top of the multilayer, a diffraction grating of adjustable efficiency, and variable optical bandwidth can be obtained. Diffraction efficiency into the first order in reflection varying between 1 and 98 percent has been achieved by controlling the design of the multilayer and the depth, shape, and material comprising the grooves of the grating structure. Methods for fabricating these gratings without the use of ion etching techniques are described.

Perry, Michael D. (Livermore, CA); Britten, Jerald A. (Oakley, CA); Nguyen, Hoang T. (Livermore, CA); Boyd, Robert (Livermore, CA); Shore, Bruce W. (Livermore, CA)

1999-01-01T23:59:59.000Z

4

Multilayer dielectric diffraction gratings  

DOE Patents [OSTI]

The design and fabrication of dielectric grating structures with high diffraction efficiency used in reflection or transmission is described. By forming a multilayer structure of alternating index dielectric materials and placing a grating structure on top of the multilayer, a diffraction grating of adjustable efficiency, and variable optical bandwidth can be obtained. Diffraction efficiency into the first order in reflection varying between 1 and 98 percent has been achieved by controlling the design of the multilayer and the depth, shape, and material comprising the grooves of the grating structure. Methods for fabricating these gratings without the use of ion etching techniques are described. 7 figs.

Perry, M.D.; Britten, J.A.; Nguyen, H.T.; Boyd, R.; Shore, B.W.

1999-05-25T23:59:59.000Z

5

The Mutton Snapper (Lutjanus analis) Spawning Aggregation Fishery at Gladden Spit, Belize: Inter-annual and Within-season Dynamics  

E-Print Network [OSTI]

.............................................................................................. 33 2.5. Summary ................................................................................................ 40 CHAPTER III WITHIN-SEASON DYNAMICS OF THE MUTTON SNAPPER (Lutjanus analis) SPAWNING AGGREGATION FISHERY AT GLADDEN SPIT... ............................................................................. 45 3.3. Results .................................................................................................... 54 3.4. Discussion .............................................................................................. 60 3.5. Summary...

Granados-Dieseldorff, Pablo

2013-11-07T23:59:59.000Z

6

Incinerator Grate Combustion Phenomena  

Science Journals Connector (OSTI)

The predominant MSW incinerators burn wastes of a wide range of calorific values on a moving grate, without any waste preprocessing. However, in some countries, these incineration systems suffer from unfavora...

Prof. J. Swithenbank; Prof. Vida N. Sharifi

2013-01-01T23:59:59.000Z

7

Supersymmetric Bragg gratings  

E-Print Network [OSTI]

The supersymmetric (SUSY) structure of coupled-mode equations that describe scattering of optical waves in one-dimensional Bragg gratings is highlighted. This property can find applications to the synthesis of special Bragg filters and distributed-feedback (DFB) optical cavities. In particular, multiple SUSY (Darboux-Crum) transformations can be used to synthesize DFB filters with any desired number of resonances at target frequencies. As an example, we describe the design of a DFB structure with a set of equally-spaced resonances, i.e. a frequency comb transmission filter.

Longhi, Stefano

2015-01-01T23:59:59.000Z

8

Gratings Inc | Open Energy Information  

Open Energy Info (EERE)

Gratings Inc Gratings Inc Jump to: navigation, search Name Gratings, Inc. Place Albuquerque, New Mexico Zip 87107 Product R&D firm that specialises in microstructural and nanostructural approaches to different challenges facing the microelectronics and power industries. Coordinates 35.08418°, -106.648639° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":35.08418,"lon":-106.648639,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

9

Compact Imaging Spectrometer Utilizing Immersed Gratings  

DOE Patents [OSTI]

A compact imaging spectrometer with an immersive diffraction grating that compensates optical distortions. The imaging spectrometer comprises an entrance slit for transmitting light, a system for receiving the light and directing the light, an immersion grating, and a detector array. The entrance slit, the system for receiving the light, the immersion grating, and the detector array are positioned wherein the entrance slit transmits light to the system for receiving the light and the system for receiving the light directs the light to the immersion grating and the immersion grating receives the light and directs the light through an optical element to the detector array.

Chrisp, Michael P. (Danville, CA); Lerner, Scott A. (Corvallis, OR); Kuzmenko, Paul J. (Livermore, CA); Bennett, Charles L. (Livermore, CA)

2006-03-21T23:59:59.000Z

10

Electromagnetically induced grating with maximal atomic coherence  

SciTech Connect (OSTI)

We describe theoretically an atomic diffraction grating that combines an electromagnetically induced grating with a coherence grating in a double-{Lambda} atomic system. With the atom in a condition of maximal coherence between its lower levels, the combined gratings simultaneously diffract both the incident probe beam as well as the signal beam generated through four-wave mixing. A special feature of the atomic grating is that it will diffract any beam resonantly tuned to any excited state of the atom accessible by a dipole transition from its ground state.

Carvalho, Silvania A.; Araujo, Luis E. E. de [Instituto de Fisica ''Gleb Wataghin'', Universidade Estadual de Campinas, Campinas-SP, 13083-859 Sao Paulo (Brazil)

2011-10-15T23:59:59.000Z

11

Immersion diffractometry for determining nanoscale grating pitch  

Science Journals Connector (OSTI)

The laser diffractometer is an effective instrument for calibrating pitch standard of a grating structure. A conventional diffractometer based on the Littrow configuration cannot...

Lu, Sheng-Hua; Tseng, Li-Cheng; Kao, Ching-Fen; Pan, Shang-Peng; Chang, Liang-Chih

2006-01-01T23:59:59.000Z

12

Heat treatment for reduction of surface roughness on holographic gratings  

Science Journals Connector (OSTI)

Controlled postdevelopment heat treatment of the photoresist polymer used in the preparation of holographic gratings has been shown to enhance the diffraction efficiency of gratings...

Rabady, Rabi; Frankstein, Dmitry; Avrutsky, Ivan

2003-01-01T23:59:59.000Z

13

Pitch-variable blazed grating consisting of freestanding silicon beams  

Science Journals Connector (OSTI)

Theoretical analysis is presented for a pitch-variable blazed grating which consists of freestanding silicon beams. The pitch-variable blazed grating is implemented by combining...

Wang, Yongjin; Kanamori, Yoshiaki; Hane, Kazuhiro

2009-01-01T23:59:59.000Z

14

Compact imaging spectrometer utilizing immersed gratings  

DOE Patents [OSTI]

A compact imaging spectrometer with an immersive diffraction grating that compensates optical distortions. The imaging spectrometer comprises an entrance slit for transmitting light, means for receiving the light and directing the light, an immersion grating, and a detector array. The entrance slit, the means for receiving the light, the immersion grating, and the detector array are positioned wherein the entrance slit transmits light to the means for receiving the light and the means for receiving the light directs the light to the immersion grating and the immersion grating receives the light and directs the light to the means for receiving the light, and the means for receiving the light directs the light to the detector array.

Chrisp, Michael P. (Danville, CA); Lerner, Scott A. (Corvallis, OR); Kuzmenko, Paul J. (Livermore, CA); Bennett, Charles L. (Livermore, CA)

2007-07-03T23:59:59.000Z

15

FDM Helmholtz modeling of finite grating and waveguide width effects on resonant subwavelength grating reflectivity.  

SciTech Connect (OSTI)

Resonant subwavelength gratings (RSGs) may be used as narrow-band wavelength and angular reflectors. Rigorous coupled wave analysis (RCWA) predicts 100% reflectivity at the resonant frequency of an incident plane wave from an RSG of infinite extent. For devices of finite extent or for devices illuminated with a finite beam, the peak reflectivity drops, coupled with a broadening of the peak. More complex numerical methods are required to model these finite effects. We have modeled finite devices and finite beams with a two-dimensional finite difference Helmholtz equation. The effect of finite grating aperture and finite beam size are investigated. Specific cases considered include Gaussian beam illumination of an infinite grating, Gaussian illumination of a finite grating, and plane wave illumination of an apertured grating. For a wide grating with a finite Gaussian beam, it is found that the reflectivity is an exponential function of the grating width. Likewise, for an apertured grating the reflectivity shows an exponential decay with narrowing aperture size. Results are compared to other methods, including plane wave decomposition of Gaussian beams using RCWA for the case of a finite input beam, and a semi-analytical techniques for the case of the apertured grating.

Kemme, Shanalyn A.; Peters, David William; Hadley, G. Ronald

2003-07-01T23:59:59.000Z

16

Grating enhanced solid-state laser amplifiers  

DOE Patents [OSTI]

A novel method and apparatus for suppressing ASE and parasitic oscillation modes in a high average power laser is introduced. Such an invention, as disclosed herein, uses diffraction gratings to increase gain, stored energy density, and pumping efficiency of solid-state laser gain media, such as, but not limited to rods, disks and slabs. By coupling predetermined gratings to solid-state gain media, such as crystal or ceramic laser gain media, ASE and parasitic oscillation modes can be effectively suppressed.

Erlandson, Alvin C. (Livermore, CA); Britten, Jerald A. (Clayton, CA)

2010-11-09T23:59:59.000Z

17

125Te NMR chemical-shift trends in PbTeGeTe and PbTeSnTe alloys  

SciTech Connect (OSTI)

Complex tellurides, such as doped PbTe, GeTe, and their alloys, are among the best thermoelectric materials. Knowledge of the change in 125Te NMR chemical shift due to bonding to dopant or solute atoms is useful for determination of phase composition, peak assignment, and analysis of local bonding. We have measured the 125Te NMR chemical shifts in PbTe-based alloys, Pb1?xGexTe and Pb1?xSnxTe, which have a rocksalt-like structure, and analyzed their trends. For low x, several peaks are resolved in the 22-kHz MAS 125Te NMR spectra. A simple linear trend in chemical shifts with the number of Pb neighbors is observed. No evidence of a proposed ferroelectric displacement of Ge atoms in a cubic PbTe matrix is detected at low Ge concentrations. The observed chemical shift trends are compared with the results of DFT calculations, which confirm the linear dependence on the composition of the first-neighbor shell. The data enable determination of the composition of various phases in multiphase telluride materials. They also provide estimates of the 125Te chemical shifts of GeTe and SnTe (+970 and +400150 ppm, respectively, from PbTe), which are otherwise difficult to access due to Knight shifts of many hundreds of ppm in neat GeTe and SnTe.

Njegic, Bosiljka [Ames Laboratory; Levin, Evgenii M. [Ames Laboratory; Schmidt-Rohr, Klaus [Ames Laboratory

2013-10-08T23:59:59.000Z

18

Electro-optic Phase Grating Streak Spectrometer  

SciTech Connect (OSTI)

The electro-optic phase grating streak spectrometer (EOPGSS) generates a time-resolved spectra equivalent to that obtained with a conventional spectrometer/streak camera combination, but without using a streak camera (by far the more expensive and problematic component of the conventional system). The EOPGSS is based on a phase, rather than an amplitude grating. Further, this grating is fabricated of electro-optic material such as, for example, KD*P, by either etching grooves into an E-O slab, or by depositing lines of the E-O material onto an optical flat. An electric field normal to the grating alters the materials index of refraction and thus affects a shift (in angle) of the output spectrum. Ramping the voltage streaks the spectrum correspondingly. The streak and dispersion directions are the same, so a second (static, conventional) grating disperses the spectrum in the orthogonal direction to prevent different wavelengths from overwriting each other. Because the streaking is done by the grating, the streaked output spectrum is recorded with a time-integrating device, such as a CCD. System model, typical design, and performance expectations will be presented.

Goldin, F. J.

2012-08-02T23:59:59.000Z

19

Grating tuned unstable resonator laser cavity  

DOE Patents [OSTI]

An unstable resonator to be used in high power, narrow line CO.sub.2 pump lasers comprises an array of four reflectors in a ring configuration wherein spherical and planar wavefronts are separated from each other along separate optical paths and only the planar wavefronts are impinged on a plane grating for line tuning. The reflector array comprises a concave mirror for reflecting incident spherical waves as plane waves along an output axis to form an output beam. A plane grating on the output axis is oriented to reflect a portion of the output beam off axis onto a planar relay mirror spaced apart from the output axis in proximity to the concave mirror. The relay mirror reflects plane waves from the grating to impinge on a convex expanding mirror spaced apart from the output axis in proximity to the grating. The expanding mirror reflects the incident planar waves as spherical waves to illuminate the concave mirror. Tuning is provided by rotating the plane grating about an axis normal to the output axis.

Johnson, Larry C. (Princeton, NJ)

1982-01-01T23:59:59.000Z

20

Fabrication and characterization of the source grating for visibility improvement of neutron phase imaging with gratings  

SciTech Connect (OSTI)

The fabrication of gratings including metal deposition processes for highly neutron absorbing lines is a critical issue to achieve a good visibility of the grating-based phase imaging system. The source grating for a neutron Talbot-Lau interferometer is an array of Gadolinium (Gd) structures that are generally made by sputtering, photo-lithography, and chemical wet etching. However, it is very challenging to fabricate a Gd structure with sufficient neutron attenuation of approximately more than 20 {mu}m using a conventional metal deposition method because of the slow Gd deposition rate, film stress, high material cost, and so on. In this article, we fabricated the source gratings for neutron Talbot-Lau interferometers by filling the silicon structure with Gadox particles. The new fabrication method allowed us a very stable and efficient way to achieve a much higher Gadox filled structure than a Gd film structure, and is even more suitable for thermal polychromatic neutrons, which are more difficult to stop than cold neutrons. The newly fabricated source gratings were tested at the polychromatic thermal neutron grating interferometer system of HANARO at the Korea Atomic Energy Research Institute, and the visibilities and images from the neutron phase imaging system with the new source gratings were compared with those fabricated by a Gd deposition method.

Kim, Jongyul [Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea, Republic of); Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of); Lee, Kye Hong; Lim, Chang Hwy; Kim, Taejoo [Neutron Science Division, Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea, Republic of); Ahn, Chi Won [Nano Fusion Technology Division, National Nanofab Center, Daejeon 305-701 (Korea, Republic of); Cho, Gyuseong [Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of); Lee, Seung Wook [School of Mechanical Engineering, Pusan National University, Pusan 609-735 (Korea, Republic of)

2013-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

Ultra-high density diffraction grating  

SciTech Connect (OSTI)

A diffraction grating structure having ultra-high density of grooves comprises an echellette substrate having periodically repeating recessed features, and a multi-layer stack of materials disposed on the echellette substrate. The surface of the diffraction grating is planarized, such that layers of the multi-layer stack form a plurality of lines disposed on the planarized surface of the structure in a periodical fashion, wherein lines having a first property alternate with lines having a dissimilar property on the surface of the substrate. For example, in one embodiment, lines comprising high-Z and low-Z materials alternate on the planarized surface providing a structure that is suitable as a diffraction grating for EUV and soft X-rays. In some embodiments, line density of between about 10,000 lines/mm to about 100,000 lines/mm is provided.

Padmore, Howard A.; Voronov, Dmytro L.; Cambie, Rossana; Yashchuk, Valeriy V.; Gullikson, Eric M.

2012-12-11T23:59:59.000Z

22

Application of spherical gratings in synchrotron radiation spectroscopy  

SciTech Connect (OSTI)

The recent development in gracing incidence grating monochromator design is discussed and the performance limiting for such instruments are examined. Especially the aberrations of toroidal and spherical gratings are investigated using the optical path function concept. It is shown that large radius spherical gratings, which can be produced with better slope tolerances than aspherics, also yield smaller overall line curvature than toroids. Therefore, a new simple spherical grating monochromator design is proposed and its performance is analyzed.

Hogrefe, H.; Howells, M.R.; Hoyer, E.

1986-05-01T23:59:59.000Z

23

Nanoparticle-Enhanced Diffraction Gratings for Ultrasensitive Surface Plasmon Biosensing  

E-Print Network [OSTI]

Nanoparticle-Enhanced Diffraction Gratings for Ultrasensitive Surface Plasmon Biosensing Alastair W by the adsorption of gold nanoparticles onto gold diffraction gratings. An enhanced diffraction obtained in the grating to the localized surface plasmons in the gold nanoparticles. As a first example

24

A New Multilayer-Based Grating for Hard X-ray Grating Interferometry |  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

The Most Detailed Picture Yet of a Key AIDS Protein The Most Detailed Picture Yet of a Key AIDS Protein Superconductivity with Stripes How HIV Infects Cells Simulating Deep Earthquakes in the Laboratory A "Sponge" Path to Better Catalysts and Energy Materials Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed A New Multilayer-Based Grating for Hard X-ray Grating Interferometry November 20, 2013 Bookmark and Share An image of the phase shift in the mouse kidney from a Bonse-Hart interferometer built utilizing the new micro-multilayer grating provides a projection view of the blood vessels. A new kind of x-ray multilayer grating that could open a pathway for high-sensitivity, hard x-ray phase contrast full-field imaging of large

25

A computational inverse diffraction grating problem  

E-Print Network [OSTI]

Mar 2, 2012 ... od and a variational (finite element) method have been developed in [3,4]. ... problems in diffractive optics, which is to design a grating structure that .... where the free-space quasiperiodic Green function is given ex- plicitly as.

2012-02-29T23:59:59.000Z

26

Fluidized bed boiler having a segmented grate  

DOE Patents [OSTI]

A fluidized bed furnace (10) is provided having a perforate grate (9) within a housing which supports a bed of particulate material including some combustibles. The grate is divided into a plurality of segments (E2-E6, SH1-SH5, RH1-RH5), with the airflow to each segment being independently controlled. Some of the segments have evaporating surface imbedded in the particulate material above them, while other segments are below superheater surface or reheater surface. Some of the segments (E1, E7) have no surface above them, and there are ignitor combustors (32, 34) directed to fire into the segments, for fast startup of the furnace without causing damage to any heating surface.

Waryasz, Richard E. (Longmeadow, MA)

1984-01-01T23:59:59.000Z

27

Compact reflective imaging spectrometer utilizing immersed gratings  

DOE Patents [OSTI]

A compact imaging spectrometer comprising an entrance slit for directing light, a first mirror that receives said light and reflects said light, an immersive diffraction grating that diffracts said light, a second mirror that focuses said light, and a detector array that receives said focused light. The compact imaging spectrometer can be utilized for remote sensing imaging spectrometers where size and weight are of primary importance.

Chrisp, Michael P. (Danville, CA)

2006-05-09T23:59:59.000Z

28

Ultrafast transient grating radiation to optical image converter  

DOE Patents [OSTI]

A high sensitivity transient grating ultrafast radiation to optical image converter is based on a fixed transmission grating adjacent to a semiconductor substrate. X-rays or optical radiation passing through the fixed transmission grating is thereby modulated and produces a small periodic variation of refractive index or transient grating in the semiconductor through carrier induced refractive index shifts. An optical or infrared probe beam tuned just below the semiconductor band gap is reflected off a high reflectivity mirror on the semiconductor so that it double passes therethrough and interacts with the radiation induced phase grating therein. A small portion of the optical beam is diffracted out of the probe beam by the radiation induced transient grating to become the converted signal that is imaged onto a detector.

Stewart, Richard E; Vernon, Stephen P; Steel, Paul T; Lowry, Mark E

2014-11-04T23:59:59.000Z

29

Imaging Spectrometer Designs Utilizing Immersed Gratings With Accessible Entrance Slit  

DOE Patents [OSTI]

A compact imaging spectrometer comprises an entrance slit, a catadioptric lens with a mirrored surface, a grating, and a detector array. The entrance slit directs light to the mirrored surface of the catadioptric lens; the mirrored surface reflects the light back through the lens to the grating. The grating receives the light from the catadioptric lens and diffracts the light to the lens away from the mirrored surface. The lens transmits the light and focuses it onto the detector array.

Chrisp, Michael P. (Danville, CA); Lerner, Scott A. (Corvallis, OR)

2006-03-21T23:59:59.000Z

30

Synthesis of all-pass filters by codirectional grating couplers  

Science Journals Connector (OSTI)

It is well known that soliton shapes result from reflectionless potentials. We propose a new technique for the synthesis of all-pass codirectional filter gratings that yields...

Peral, E; Capmany, J; Marti, J

1997-01-01T23:59:59.000Z

31

Abnormal spectral evolution of fiber Bragg gratings in hydrogenated fibers  

Science Journals Connector (OSTI)

We report the observation of abnormal spectral evolution in regenerated fiber Bragg gratings in hydrogenated BGe-codoped and standard telecom fiber with UV overexposure. The...

Liu, Y; Williams, J A R; Zhang, L; Bennion, I

2002-01-01T23:59:59.000Z

32

Enhanced type IIA gratings for high-temperature operation  

Science Journals Connector (OSTI)

The inscription of type IIA fiber Bragg gratings in standard boron-codoped germanosilicate fiber has been demonstrated to show marked differences from that reported in the literature....

Groothoff, Nathaniel; Canning, John

2004-01-01T23:59:59.000Z

33

Diffraction Gratings for High-Intensity Laser Applications  

SciTech Connect (OSTI)

The scattering of light into wavelength-dependent discrete directions (orders) by a device exhibiting a periodic modulation of a physical attribute on a spatial scale similar to the wavelength of light has been the subject of study for over 200 years. Such a device is called a diffraction grating. Practical applications of diffraction gratings, mainly for spectroscopy, have been around for over 100 years. The importance of diffraction gratings in spectroscopy for the measurement of myriad properties of matter can hardly be overestimated. Since the advent of coherent light sources (lasers) in the 1960's, applications of diffraction gratings in spectroscopy have further exploded. Lasers have opened a vast application space for gratings, and apace, gratings have enabled entirely new classes of laser systems. Excellent reviews of the history, fundamental properties, applications and manufacturing techniques of diffraction gratings up to the time of their publication can be found in the books by Hutley (1) and more recently Loewen and Popov (2). The limited scope of this chapter can hardly do justice to such a comprehensive subject, so the focus here will be narrowly limited to characteristics required for gratings suitable for high-power laser applications, and methods to fabricate them. A particular area of emphasis will be on maximally-efficient large-aperture gratings for short-pulse laser generation.

Britten, J

2008-01-23T23:59:59.000Z

34

Gratings for Increasing Solid-State Laser Gain and Efficiency  

SciTech Connect (OSTI)

We introduce new concepts for increasing the efficiency of solid state lasers by using gratings deposited on laser slabs or disks. The gratings improve efficiency in two ways: (1) by coupling out of the slab deleterious amplified spontaneous emission (ASE) and (2) by increasing the absorption efficiency of pump light. The gratings also serve as antireflective coatings for the extracting laser beam. To evaluate the potential for such coatings to improve laser performance, we calculated optical properties of a 2500 groove/mm, tantala-silica grating on a 1cm x 4cm x 8cm titanium-doped sapphire slab and performed ray-trace calculations for ASE and pump light. Our calculations show substantial improvements in efficiency due to grating ASE-coupling properties. For example, the gratings reduce pump energy required to produce a 0.6/cm gain coefficient by 9%, 20% and 35% for pump pulse durations of 0.5 {micro}s, 1{micro}s and 3{micro}s, respectively. Gratings also increase 532-nm pump-light absorption efficiency, particularly when the product slab overall absorption is small. For example, when the single-pass absorption is 1 neper, absorption efficiency increases from 66%, without gratings, to 86%, when gratings are used.

Erlandson, A C; Britten, J A; Bonlie, J D

2010-04-16T23:59:59.000Z

35

Nanoparticle diffraction gratings for DNA detection on photopatterned glass substrates  

E-Print Network [OSTI]

Sendroiu and R. M. Corn: Nanoparticle diffraction gratingsSendroiu and R. M. Corn: Nanoparticle diffraction gratingsthe principle of the nanoparticle-based DNA detection assay

Sendroiu, Luliana E; Corn, Robert M

2008-01-01T23:59:59.000Z

36

Fabrication and performance of blazed transmission gratings for x-ray astronomy  

E-Print Network [OSTI]

We have developed a new type of soft x-ray diffraction grating. This critical-angle transmission (CAT) grating combines the advantages of traditional transmission gratings (low mass, extremely relaxed alignment and flatness ...

Schattenburg, Mark Lee

37

Study on drying and combustion process in grate-CFB incinerator  

Science Journals Connector (OSTI)

The drying and combustion process in the combined grate and circulating fluidized bed (grate-CFB) municipal solid waste (MSW) incinerator was ... was proposed. A 260 t/d grate-CFB incinerator was modeled and the ...

QingHai Li; YanGuo Zhang; MeiQian Chen

2009-05-01T23:59:59.000Z

38

Magnetoluminescence of CdTe/MnTe/CdMgTe heterostructures with ultrathin MnTe layers  

SciTech Connect (OSTI)

CdTe/MnTe/CdMgTe quantum-well structures with one or two monolayers of MnTe inserted at CdTe/CdMgTe interfaces were fabricated. The spectra of the excitonic luminescence from CdTe quantum wells and their variation with temperature indicate that introduction of ultrathin MnTe layers improves the interface quality. The effect of a magnetic field in the Faraday configuration on the spectral position of the exciton-emission peaks indicates that frustration of magnetic moments in one-monolayer MnTe insertions is weaker than in two-monolayer insertions. The effect of a magnetic field on the exciton localization can be explained in terms of the exciton wave-function shrinkage and obstruction of the photoexcited charge-carrier motion in the quantum well.

Agekyan, V. F., E-mail: vfag@rambler.ru [St. Petersburg State University, Fock Institute of Physics (Russian Federation); Holz, P. O. [Polish Academy of Sciences, Institute of Physics (Poland); Karczewski, G. [Linkoeping University (Sweden); Katz, V. N. [St. Petersburg State University, Fock Institute of Physics (Russian Federation); Moskalenko, E. S. [Russian Academy of Sciences, Ioffe Physical Technical Institute (Russian Federation); Serov, A. Yu.; Filosofov, N. G. [St. Petersburg State University, Fock Institute of Physics (Russian Federation)

2011-10-15T23:59:59.000Z

39

Graphene-based absorber exploiting guided mode resonances in one-dimensional gratings  

E-Print Network [OSTI]

A one-dimensional dielectric grating, based on a simple geometry, is proposed and investigated to enhance light absorption in a monolayer graphene exploiting guided mode resonances. Numerical findings reveal that the optimized configuration is able to absorb up to 60% of the impinging light at normal incidence for both TE and TM polarizations resulting in a theoretical enhancement factor of about 26 with respect to the monolayer graphene absorption (about 2.3%). Experimental results confirm this behaviour showing CVD graphene absorbance peaks up to about 40% over narrow bands of few nanometers. The simple and flexible design paves the way for the realization of innovative, scalable and easy-to-fabricate graphene-based optical absorbers.

Grande, M; Stomeo, T; Bianco, G V; de Ceglia, D; Akozbek, N; Petruzzelli, V; Bruno, G; De Vittorio, M; Scalora, M; Orazio, A D

2014-01-01T23:59:59.000Z

40

Planar Bragg Gratings - Fabrication and Applications from Engineering to Quantum Information  

Science Journals Connector (OSTI)

Research on planar Bragg gratings will be described including: sensors for chemical and biological materials, on the use of gratings within cantilevers and ...

Smith, Peter G

Note: This page contains sample records for the topic "te grated analy" 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

CdTe/CdZnTe pixellated radiation detector.  

E-Print Network [OSTI]

??The work in this thesis is focused on the study of CdTe/CdZnTe pixellated detectors. During this research, three main aspects have been covered in the (more)

Mohd Zain, Rasif

2015-01-01T23:59:59.000Z

42

Weak topological insulators in PbTe/SnTe superlattices  

E-Print Network [OSTI]

It is desirable to realize topological phases in artificial structures by engineering electronic band structures. In this paper we investigate (PbTe)[subscript m](SnTe)[subscript 2n?m] superlattices along the [001] direction ...

Yang, Gang

43

ON THE GAGE FACTOR FOR OPTICAL FIBER GRATING STRAIN GAGES  

E-Print Network [OSTI]

of grating and fiber types. KEY WORDS: Fiber-Optic Gratings, Fiber-Optic Sensors, Strain Gage Factor 1 theoretical background. Then, in Section 3, we discuss measurement methods followed by the experimental tests and results in Section 4, before concluding in Section 5. 2. THEORETICAL BACKGROUND Consider an FBG fabricated

Park, Yong-Lae

44

Compact Catadioptric Imaging Spectrometer Designs Utilizing Immersed Gratings  

DOE Patents [OSTI]

An imaging spectrometer comprising an entrance slit for directing light, a lens that receives said light and reflects said light, a grating that defracts said light back onto said lens which focuses said light, and a detector array that receives said focused light. In one embodiment the grating has rulings immersed into a germanium surface.

Lerner, Scott A. (Livermore, CA)

2006-02-28T23:59:59.000Z

45

Te INCLUSIONS IN CdTe GROWN FROM A SLOWLY COOLED Te SOLUTION AND BY THE TRAVELLING SOLVENT METHOD  

E-Print Network [OSTI]

135 Te INCLUSIONS IN CdTe GROWN FROM A SLOWLY COOLED Te SOLUTION AND BY THE TRAVELLING SOLVENT. Abstract. 2014 CdTe crystals have been grown from a slowly cooled Te solution and with the travelling. Introduction. - CdTe crystals for nuclear radia- tion detectors are usually grown from a slowly cooled solution

Paris-Sud XI, Université de

46

ALS Scientists Patent Technique To Dramatically Advance Grating-Based  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ALS Scientists Patent Technique To ALS Scientists Patent Technique To Dramatically Advance Grating-Based Spectroscopy ALS Scientists Patent Technique To Dramatically Advance Grating-Based Spectroscopy Print Tuesday, 29 January 2013 16:28 Gratings - optical elements used to separate light in spectroscopy applications - have been in use since the early 19th century. Developments in the late 19th century led to the manufacture of gratings by highly precise ruling with a diamond onto a metallic surface. Many gratings are still produced today using the same technique. Holographic methods and ion etching are also used, but all of these techniques result in gratings that contain significant imperfections, which limits resolution. Watch a video about this topic... However, a new type of ultra-high diffraction grating recently patented by members of the ALS Experimental Systems Group (ESG), working with colleagues from Berkeley Lab's Center for X-ray Optics, stands to revolutionize the resolution capabilities of soft x-ray spectroscopy. The key to the new technique is the production of a near atomically perfect substrate, using the anisotropic etching of silicon.

47

ALS Scientists Patent Technique To Dramatically Advance Grating-Based  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ALS Scientists Patent Technique To Dramatically ALS Scientists Patent Technique To Dramatically Advance Grating-Based Spectroscopy ALS Scientists Patent Technique To Dramatically Advance Grating-Based Spectroscopy Print Gratings - optical elements used to separate light in spectroscopy applications - have been in use since the early 19th century. Developments in the late 19th century led to the manufacture of gratings by highly precise ruling with a diamond onto a metallic surface. Many gratings are still produced today using the same technique. Holographic methods and ion etching are also used, but all of these techniques result in gratings that contain significant imperfections, which limits resolution. Watch a video about this topic... However, a new type of ultra-high diffraction grating recently patented by members of the ALS Experimental Systems Group (ESG), working with colleagues from Berkeley Lab's Center for X-ray Optics, stands to revolutionize the resolution capabilities of soft x-ray spectroscopy. The key to the new technique is the production of a near atomically perfect substrate, using the anisotropic etching of silicon.

48

Increase of the grating coupler bandwidth with a graphene overlay  

SciTech Connect (OSTI)

We present theoretical and experimental results that demonstrate an increase in the grating bandwidth by placing a graphene on the chip. A focusing subwavelength grating with coupling efficiency of ?4.3?dB and 1?dB bandwidth of ?60?nm was demonstrated. After a graphene sheet was transferred onto the chip, the maximum 1?dB bandwidth was increased to ?72?nm. Experimental results are consistent with the calculated graphene induced waveguide refractive index and dispersion changes, and the bandwidth improvement may be attributed to the reduction of grating dispersion. This study may be of interest for graphene-on-silicon photonic integrated circuit applications.

Cheng, Zhenzhou; Li, Zhen; Xu, Ke; Tsang, Hon Ki, E-mail: hktsang@ee.cuhk.edu.hk [Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin (Hong Kong)

2014-03-17T23:59:59.000Z

49

Measures to Reduce Grate Material Wear in Fixed-Bed Combustion  

Science Journals Connector (OSTI)

In a grate furnace the fuel forms a burning bed resting on a grate. ... The grate is typically sloping from the fuel inlet to the ash pit and the fuel is transported by reciprocating or vibrating movements of the grate or by adjusting the slope to allow the fuel to be transported by gravity (fixed grates). ... The symbol () is the measured temperature between the grate and the bed during burn-out of wood char(15) and the symbol (+) is the measured temperature inside a grate rod during combustion of wood chips. ...

Sven Hermansson; Henrik Thunman

2011-03-15T23:59:59.000Z

50

Grate assembly for fixed-bed coal gasifier  

DOE Patents [OSTI]

A grate assembly for a coal gasifier of a moving-bed or fixed-bed type is provided for crushing agglomerates of solid material such as clinkers, tailoring the radial distribution of reactant gases entering the gasification reaction zone, and control of the radial distribution of downwardly moving solid velocities in the gasification and combustion zone. The clinker crushing is provided by pinching clinkers between vertically oriented stationary bars and angled bars supported on the upper surface of a rotating conical grate. The distribution of the reactant gases is provided by the selective positioning of horizontally oriented passageways extending through the grate. The radial distribution of the solids is provided by mounting a vertically and generally radially extending scoop mechanism on the upper surface of the grate near the apex thereof.

Notestein, John E. (Morgantown, WV)

1993-01-01T23:59:59.000Z

51

Design of a high index contrast arrayed waveguide grating  

E-Print Network [OSTI]

Arrayed waveguide gratings (AWGs) are useful structures for the implementation of wavelength division multiplexing. The AWG consists of an input splitter, a dispersive waveguide array which creates the wavelength demultiplexing ...

Lang, Ryan N. (Ryan Nathan)

2003-01-01T23:59:59.000Z

52

Photo-Thermal Effects in Fiber Bragg Gratings  

Science Journals Connector (OSTI)

The photo-thermal effect describes the absorption of light and a change in grating characteristics via dn/dT, which can mask fast non-linear optical effects. The effect is...

Littler, Ian C; Grujic, Thomas; Eggleton, Benjamin J

53

Compact Refractive Imaging Spectrometer Designs Utilizing Immersed Gratings  

DOE Patents [OSTI]

A compact imaging spectrometer comprising an entrance slit for directing light, a first means for receiving the light and focusing the light, an immersed diffraction grating that receives the light from the first means and defracts the light, a second means for receiving the light from the immersed diffraction grating and focusing the light, and an image plane that receives the light from the second means

Lerner, Scott A. (Livermore, CA); Bennett, Charles L. (Livermore, CA); Bixler, Jay V. (Oakland, CA); Kuzmenko, Paul J. (Livermore, CA); Lewis, Isabella T. (San Jose, CA)

2005-07-26T23:59:59.000Z

54

Image-line voltage controlled oscillators and grating antennas  

E-Print Network [OSTI]

IMAGE-LINE VOLTAGE CONTROLLED OSCILLATORS AND GRATING ANTENNAS A Thesis by ALEXANDER MacDONALD KIRK Submitted to the Office of Graduate Studies of Texas ABM University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE May 1991 Major Subject: Electrical Engineering IMAGE-LINE VOLTAGE CONTROLLED OSCILLATORS AND GRATING ANTENNAS A Thesis by ALEXANDER MacDONALD KIRK Approved as to style and content by: Kai Chang (Chair of Committee) Robert D. Nevels...

Kirk, Alexander MacDonald

1991-01-01T23:59:59.000Z

55

Low efficiency gratings for 3rd harmonic diagnostics applications  

SciTech Connect (OSTI)

The baseline design of the National Ignition Facility (NIF) calls for sampling gratings to provide third-harmonic energy diagnostics in the highly constrained area of the target chamber. These 40 {times} 4O cm transmission gratings are to diffract at (order +1) nominally 0.3% of the incident 351 run light at a small angle on to a focusing mirror and into a calorimeter. The design calls for a plane grating of 500 lines/mm, and approximately 30 run deep, etched into a fused silica focusing lens and subsequently overcoated with a solgel anti reflective coating. Gratings of similar aperture and feature size have been produced for other applications by ion etching processes, but, in an effort to reduce substantially the cost of such optics, we are studying the feasibility of making these gratings by wet chemical etching techniques. Experimentation with high-quality fused silica substrates on 5 and 15 cm. scale has led to a wet etching process which can meet the design goals and which offers no significant scaleup barriers to full sized optics. The grating is produced by holographic exposure and a series of processing steps using only a photoresist mask and a final hydrofluoric acid etch. Gratings on 15 cm diameter test substrates exhibit absolute diffraction efficiencies from 0.2--0.4% with a standard deviation of about 15% of the mean over the full aperture. The efficiency variation is due to variation in linewidth caused by spatial nonuniformities in exposure energy. Uniformity improvements can be realized by using a smaller, more uniform portion of the exposure beam and exposing for longer times. The laser damage threshold for these gratings has been measured at LLNL and found to be identical to that of the fused silica substrate.

Britten, J.A.; Boyd, R.D.; Perry, M.D.; Shore, B.W.; Thomas, I.M.

1995-08-09T23:59:59.000Z

56

Use of dual-grating sensors formed by different types of fiber Bragg gratings for simultaneous temperature and strain measurements  

Science Journals Connector (OSTI)

We report on a systematic investigation of the dependence of both temperature and strain sensitivities on the fiber Bragg grating type, including the well-known Type I, Type IIA, and a...

Shu, Xuewen; Zhao, Donghui; Zhang, Lin; Bennion, Ian

2004-01-01T23:59:59.000Z

57

Luminescence Enhancement of CdTe Nanostructures in LaF3:Ce/CdTe...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Enhancement of CdTe Nanostructures in LaF3:CeCdTe Nanocomposites. Luminescence Enhancement of CdTe Nanostructures in LaF3:CeCdTe Nanocomposites. Abstract: Radiation detection...

58

TE Connectivity Finds Answers in Tomography  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

TE Connectivity Finds Answers in Tomography TE Connectivity Finds Answers in Tomography Print Thursday, 22 August 2013 10:50 TE Connectivity is a world leader in connectivity-the...

59

Town Known for First Thanksgiving Grateful for Energy Savings | Department  

Broader source: Energy.gov (indexed) [DOE]

Town Known for First Thanksgiving Grateful for Energy Savings Town Known for First Thanksgiving Grateful for Energy Savings Town Known for First Thanksgiving Grateful for Energy Savings November 22, 2011 - 3:55pm Addthis Since January, when energy efficiency improvements were made to Memorial Hall, the civic center for the Plymouth, Mass., community, the building's energy savings have been nearly $1,200 per month. | Photo courtesy of the city of Plymouth. Since January, when energy efficiency improvements were made to Memorial Hall, the civic center for the Plymouth, Mass., community, the building's energy savings have been nearly $1,200 per month. | Photo courtesy of the city of Plymouth. Chris Galm Marketing & Communications Specialist, Office of Energy Efficiency & Renewable Energy What does this project do?

60

Applications of laser-induced gratings to spectroscopy and dynamics  

SciTech Connect (OSTI)

This program has traditionally emphasized two principal areas of research. The first is the spectroscopic characterization of large-amplitude motion on the ground-state potential surface of small, transient molecules. The second is the reactivity of carbonaceous clusters and its relevance to soot and fullerene formation in combustion. Motivated initially by the desire to find improved methods of obtaining stimulated emission pumping (SEP) spectra of transients, most of our recent work has centered on the use of laser-induced gratings or resonant four-wave mixing in free-jet expansions. These techniques show great promise for several chemical applications, including molecular spectroscopy and photodissociation dynamics. The author describes recent applications of two-color laser-induced grating spectroscopy (LIGS) to obtain background-free SEP spectra of transients and double resonance spectra of nonfluorescing species, and the use of photofragment transient gratings to probe photodissociation dynamics.

Rohlfing, E.A. [Sandia National Laboratories, Livermore, CA (United States)

1993-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

Silicon buried gratings for dielectric laser electron accelerators  

SciTech Connect (OSTI)

This paper describes design and simulations of dielectric laser electron accelerators that achieve Gigavolt-per-meter (GV/m) accelerating gradients and wide electron channels (>1??m). The accelerator design is based on a silicon buried grating structure that enables flexible phase synchronization, large electron channel fields, and low standing-wave ratio in the material. This design increases the accelerating gradients to more than double those of reported quartz grating accelerators, thereby reducing the input laser fluence by 60% for the same accelerating gradient. With a 100 fs pulsed laser, our silicon buried gratings can achieve a maximum gradient of 1.1 GV/m, indicating that these accelerators have potential for numerous electron-accelerator applications.

Chang, Chia-Ming, E-mail: cachang@alumni.stanford.edu [Bell Labs, Alcatel-Lucent, 791 Holmdel Road, Holmdel, New Jersey 07733 (United States); Solgaard, Olav [E. L. Ginzton Lab., Stanford University, Stanford, California 94305 (United States)

2014-05-05T23:59:59.000Z

62

Development of Fiber Bragg Grating Strain, Thermal, and Magnetic Sensors for Smart Structure Applications  

E-Print Network [OSTI]

fiber Bragg gratings, Troutdale, OR, USA, 1996, pp. 24-in AD072 fibercore fiber, Troutdale, OR, USA, 1998, pp. 79-

Emmons, Michael

2012-01-01T23:59:59.000Z

63

Time resolved measurements of gratings photo-induced by femtosecond pulses in a  

E-Print Network [OSTI]

gratings with suppressed cladding modes made in SMF-28 with a femtosecond IR laser and a phase mask," IEEE on the formation of gratings photo-induced by femtosecond laser pulses in SF59 glass. Depending on the number. We demonstrate that the grating formation is not instantaneous and is produced by laser

Paris-Sud XI, Université de

64

IR spectroscopy of lattice vibrations and comparative analysis of the ZnTe/CdTe quantum-dot superlattices on the GaAs substrate and with the ZnTe and CdTe buffer layers  

SciTech Connect (OSTI)

A comparative analysis of multiperiod ZnTe/CdTe superlattices with the CdTe quantum dots grown by molecular beam epitaxy on the GaAs substrate with the ZnTe and CdTe buffer layers is carried out. The elastic-stress-induced shifts of eigenfrequencies of the modes of the CdTe- and ZnTe-like vibrations of materials forming similar superlattices but grown on different buffer ZnTe and CdTe layers are compared. The conditions of formation of quantum dots in the ZnTe/CdTe superlattices on the ZnTe and CdTe buffer layers differ radically.

Kozyrev, S. P. [Russian Academy of Sciences, Lebedev Institute of Physics (Russian Federation)], E-mail: skozyrev@sci.lebedev.ru

2009-07-15T23:59:59.000Z

65

Merged vector gratings recorded in a photocrosslinkable polymer liquid crystal film for polarimetry  

SciTech Connect (OSTI)

A merged vector grating, which is holographically fabricated in an anisotropic medium by irradiation with interference light with intensity modulation and polarization modulation, was designed to detect the polarization of light. The merged vector grating is recorded by the interference of two elliptically polarized beams with equal intensities, parallel azimuths, equal ellipticities, and different directions of rotation. We clarified theoretically that the Stokes parameters of the incident light beam are described by the diffraction efficiency of the merged vector grating. Also, to apply this property to formation of a polarimeter without any moving parts or mechanisms, two merged vector gratings with different grating vectors were recorded in a photocrosslinkable polymer liquid crystal film by angle-multiplexed holography. By investigation of the diffraction properties of the gratings obtained, we demonstrated the applicability of the merged vector gratings for use in polarimetry.

Sasaki, Tomoyuki, E-mail: sasaki-tomoy@vos.nagaokaut.ac.jp; Wada, Takumi; Noda, Kohei; Ono, Hiroshi [Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 (Japan); Kawatsuki, Nobuhiro [Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 (Japan)

2014-01-14T23:59:59.000Z

66

Upconversion Luminescence of CdTe Nanoparticles. | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of CdTe Nanoparticles. Upconversion Luminescence of CdTe Nanoparticles. Abstract: Efficient upconversion luninescence is observed from CdTe nanoparticles in solution and...

67

Diffusion of Te vacancy and interstitials of Te, Cl, O, S, P and Sb in CdTe: A density functional theory study  

E-Print Network [OSTI]

Diffusion of Te vacancy and interstitials of Te, Cl, O, S, P and Sb in CdTe: A density functional profiles in CdTe of native, Te adatom and vacancy, and anionic non-native interstitial adatoms P, Sb, O, S B.V. All rights reserved. 1. Introduction Cadmium telluride (CdTe) based thin films have emerged

Khare, Sanjay V.

68

Grating monochromator for electron cyclotron resonance ion source operation  

SciTech Connect (OSTI)

Recently, we started to observe optical line spectra from an ECR plasma using a grating monochromator with a photomultiplier. The light intensity of line spectrum from the ECR plasma had a strong correlation with ion beam intensity measured by a magnetic mass analyzer. This correlation is a significant information for beam tuning because it allows the extraction of the desired ion species from the ECR plasma. Separation of ion species of the same charge to mass ratio with an electromagnetic mass analyzer is known to be an exceptionally complex process, but this research gives new insights into its simplification. In this paper, the grating monochromator method for beam tuning of a Hyper-ECR ion source as an injector for RIKEN azimuthal varying field (AVF) cyclotron is described.

Muto, Hideshi [Center of General Education, Tokyo University of Science, Suwa, 5000-1 Toyohira, Chino Nagano 391-0292 (Japan)] [Center of General Education, Tokyo University of Science, Suwa, 5000-1 Toyohira, Chino Nagano 391-0292 (Japan); Ohshiro, Yukimitsu; Yamaka, Shouichi; Watanabe, Shin-ichi; Yamaguchi, Hidetoshi; Shimoura, Susumu [Center for Nuclear Study, University of Tokyo, 2-1 Hirosawa, Riken Campus, Wako Saitama 351-0198 (Japan)] [Center for Nuclear Study, University of Tokyo, 2-1 Hirosawa, Riken Campus, Wako Saitama 351-0198 (Japan); Oyaizu, Michihiro; Kase, Masayuki [RIKEN Nishina Center for Accelerator-Based Science, Wako Saitama 351-0198 (Japan)] [RIKEN Nishina Center for Accelerator-Based Science, Wako Saitama 351-0198 (Japan); Kubono, Shigeru [Center for Nuclear Study, University of Tokyo, 2-1 Hirosawa, Riken Campus, Wako Saitama 351-0198 (Japan) [Center for Nuclear Study, University of Tokyo, 2-1 Hirosawa, Riken Campus, Wako Saitama 351-0198 (Japan); RIKEN Nishina Center for Accelerator-Based Science, Wako Saitama 351-0198 (Japan); Institute of Modern Physics, Chinese Academy of Sciences, Nanchang Road 509, Lanzhou 730000 (China); Hattori, Toshiyuki [Heavy Ion Cancer Therapy Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage Chiba 263-855 (Japan)] [Heavy Ion Cancer Therapy Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage Chiba 263-855 (Japan)

2013-07-15T23:59:59.000Z

69

A 6-beam combiner using superimposed volume index holographic gratings  

E-Print Network [OSTI]

splitter, MR: mirror, NDF: neutral density filter?????.??.44 Figure 21. The fringe patterns by interference of each pair of beams. The number below the images notes the numbers of two input beams??.46 Figure 22. Schematic diagrams of ramp... the light source is expanded and collimated, and is split into two beams. The incident angle of the reference wave is fixed and the rotation of two mirrors changes the incident angles of the object waves so that the hologram gratings have different Bragg...

Yum, HoNam

2005-11-01T23:59:59.000Z

70

Echelle grating multi-order imaging spectrometer utilizing a catadioptric lens  

DOE Patents [OSTI]

A cryogenically cooled imaging spectrometer that includes a spectrometer housing having a first side and a second side opposite the first side. An entrance slit is on the first side of the spectrometer housing and directs light to a cross-disperser grating. An echelle immersions grating and a catadioptric lens are positioned in the housing to receive the light. A cryogenically cooled detector is located in the housing on the second side of the spectrometer housing. Light from the entrance slit is directed to the cross-disperser grating. The light is directed from the cross-disperser grating to the echelle immersions grating. The light is directed from the echelle immersions grating to the cryogenically cooled detector on the second side of the spectrometer housing.

Chrisp, Michael P; Bowers, Joel M

2014-05-27T23:59:59.000Z

71

Apparatus comprising a tunable nanomechanical near-field grating and method for controlling far-field emission  

DOE Patents [OSTI]

A tunable nanomechanical near-field grating is disclosed which is capable of varying the intensity of a diffraction mode of an optical output signal. The tunable nanomechanical near-field grating includes two sub-gratings each having line-elements with width and thickness less than the operating wavelength of light with which the grating interacts. Lateral apertures in the two sub-gratings are formed from the space between one line-element of the first sub-grating and at least one line-element of the second sub-grating. One of the sub-gratings is capable of motion such that at least one of aperture width and aperture depth changes, causing a perturbation to the near-field intensity distribution of the tunable nanomechanical near-field grating and a corresponding change to the far-field emission of thereof.

Carr, Dustin Wade (Albuquerque, NM); Bogart, Gregory Robert (Corrales, NM)

2007-02-06T23:59:59.000Z

72

Compact Reflective Imaging Spectrometer Design Utilizing An Immersed Grating And Anamorphic Mirror  

DOE Patents [OSTI]

A compact imaging spectrometer comprising an entrance slit, an anamorphic mirror, a grating, and a detector array. The entrance slit directs light to the anamorphic mirror. The anamorphic mirror receives the light and directs the light to the grating. The grating receives the light from the anamorphic mirror and defracts the light back onto the anamorphic mirror. The anamorphic mirror focuses the light onto a detector array.

Lerner, Scott A. (Corvalis, OR)

2006-01-10T23:59:59.000Z

73

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

74

Thermal hypersensitisation and grating evolution in Ge-doped optical fibre  

Science Journals Connector (OSTI)

Low temperature (sub 1000C) thermal hypersensitisation is reported in germanosilicate optical waveguides. Gratings are written using a CW 266nm laser source. In contrast to laser...

Srensen, H; Canning, J; Kristensen, M

2005-01-01T23:59:59.000Z

75

Optical power transversely scattered from fiber Bragg gratings:?far-field measurements and modeling  

Science Journals Connector (OSTI)

Far-field properties of the optical power scattered from type IIA Bragg gratings photowritten within high-N.A. germanosilicate fibers have been studied under various experimental...

Pureur, D; Martinelli, G; Bernage, P; Niay, P; Douay, M; Monerie, M

1997-01-01T23:59:59.000Z

76

All-nanoparticle concave diffraction grating fabricated by self-assembly onto magnetically-recorded templates  

Science Journals Connector (OSTI)

Using the enormous magnetic field gradients present near the surface of magnetic recording media, we assemble diffraction gratings with lines consisting entirely of self-assembled...

Ye, L; Terry, B; Mefford, O T; Rinaldi, C; Crawford, T M

2013-01-01T23:59:59.000Z

77

Comparing plasmonic and dielectric gratings for absorption enhancement in thin-film organic solar cells  

Science Journals Connector (OSTI)

We theoretically investigate and compare the influence of square silver gratings and one-dimensional photonic crystal (1D PC) based nanostructures on the light absorption of organic...

Le, Khai Q; Abass, Aimi; Maes, Bjorn; Bienstman, Peter; Al, Andrea

2012-01-01T23:59:59.000Z

78

Plasmonic gratings for enhanced light-trapping in thin-film organic solar cells  

Science Journals Connector (OSTI)

We discuss optimized silver gratings to enhance absorption in organic solar cells. The enhancement is attributed to generated surface plasmon (SP) polaritons and localized SP...

Le, Khai Q; Al, Andrea

79

Broadband light absorption enhancement in polymer photovoltaics using metal nanowall gratings as transparent electrodes  

SciTech Connect (OSTI)

The authors investigate light absorption in organic solar cells in which indium tin oxide (ITO) is replaced by a new metallic architecture (grating) as a transparent electrode. Different from typical metal nanowire gratings, our gratings consist of metal nanowalls with nanoscale footprint and (sub)microscale height [Adv. Mater. 23, 2469 (2011)], thus ensuring high optical transmittance and electrical conductivity. Simulations reveal that a broadband and polarization-insensitive light absorption enhancement is achieved via two mechanisms, when such silver nanowall gratings are employed in P3HT:PCBM based solar cells. Overall absorption enhanced by ~23% compared to a reference cell with ITO electrode.

Ye, Zhuo; Chaudhary, Sumit; Kuang, Ping; Ho, Kai-Ming

2012-05-15T23:59:59.000Z

80

E-Print Network 3.0 - advanced bragg gratings Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bragg grating in the cavity... . Hellstrm, V. Pasiskevicius, and F. Laurell, "Widely tunable Yb:KYW laser with a volume Bragg ... Source: Van Stryland, Eric - School of Optics...

Note: This page contains sample records for the topic "te grated analy" 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

X-ray standing wave study of CdTe/MnTe/CdTe(001) heterointerfaces J. C. Boulliard,a)  

E-Print Network [OSTI]

features of the first stages of growth of ultrathin pseudomorphic MnTe 001 strained layers buried in CdTe on CdTe 001 substrates. Experiments with 004 and 113 reflecting planes show evidence of the presenceTe layers grown in CdTe 001 by molecular beam epitaxy. The results will be compared to high resolution

Boyer, Edmond

82

Observation de super-rseaux CdTe-HgTe par microscopie lectronique en transmission  

E-Print Network [OSTI]

-conducteurs II-VI a été beaucoup plus tardive [2]. Dans cette dernière famille, le système CdTe- HgTe présente l'avantage d'un accord de maille quasi parfait entre les deux composés (a = 0,648 nm pour CdTe contre a = 0 JET MOL?CULAIRE. - Les super- réseaux CdTe-HgTe ont été épitaxiés sur un substrat CdTe d

Paris-Sud XI, Université de

83

Inscription of Thermally Durable Type IIA Gratings in B/Ge-codoped Optical Fibres Using 248nm, 500fs Radiation  

Science Journals Connector (OSTI)

Results on the inscription of Type IIA Bragg gratings in B-germanosilicate fibres using 248nm, 500fs laser radiation are presented. The gratings recorded exhibit index changes ?n?10-3,...

Violakis, George; Konstantaki, Maria; Pissadakis, Stavros

84

998 JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 13, NO. 6, DECEMBER 2004 Analog Piezoelectric-Driven Tunable Gratings  

E-Print Network [OSTI]

actuation, as predicted by device modeling. The actuators demonstrate a piezo- electric 31 coefficient as "digital": for example, the Polychromator [1], the Grating Light Valve [2], the MEMS Compound Grating [3

Kim, Sang-Gook

85

Femtosecond laser-inscribed fiber Bragg gratings for strain monitoring in power cables of offshore wind turbines  

Science Journals Connector (OSTI)

A fiber Bragg grating sensor system used for monitoring the effects of strain on the power cable of an offshore wind turbine is presented. The Bragg grating structure was inscribed...

Burgmeier, Jrg; Schippers, Wolfgang; Emde, Nico; Funken, Peter; Schade, Wolfgang

2011-01-01T23:59:59.000Z

86

The Constellation-X RGS options: Raytrace Modeling of the Off-plane Gratings  

E-Print Network [OSTI]

The Constellation-X RGS options: Raytrace Modeling of the Off-plane Gratings K.A. Flanagan, J The Reflection Grating Spectrometer of the Constellation-X mission has two strong candidate configurations resolving powers in excess of 1000 (defined with half-energy width) are achievable for sufficiently long

87

Shaping of Thin Grazing-Incidence Reflection Grating Substrates via Magnetorheological Finishing  

E-Print Network [OSTI]

for sub-arcsecond reflection optics. Keywords: x-ray optics, Constellation-X, reflection gratings, thin, such as Constellation-X,1 rely on grazing-incidence reflection gratings to provide the necessary high diffraction efficiency and dispersion for soft x-ray photons in the energy range of approximately 0.25 - 2.0 keV (0.6 - 5

88

Optimizing and characterizing grating efficiency for a soft X-ray emission spectrometer  

Science Journals Connector (OSTI)

The efficiency of soft X-ray diffraction gratings is examined using theoretical calculations with new open-source software, and insights to design a high-performance emission spectrometer are applied. The calculated and measured efficiencies of real-world gratings are compared, and discrepancies are explained by incorporating real-world effects into the calculations.

Boots, M.

2013-02-06T23:59:59.000Z

89

EDFA Gain Flattening Using Long-Period Fibre Gratings Based on the Electric Arc Technique  

E-Print Network [OSTI]

of new stresses during the electric arc discharges as the main mechanism for their formation [5]. #12EDFA Gain Flattening Using Long-Period Fibre Gratings Based on the Electric Arc Technique O. Frazão of the long-period fibre grating is based on the electric arc technique. 1. Introduction. The gain flattening

Haddadi, Hamed

90

Plasmonic backcontact grating for P3HT:PCBM organic solar cells enabling strong optical  

E-Print Network [OSTI]

Plasmonic backcontact grating for P3HT:PCBM organic solar cells enabling strong optical absorption organic solar cells we propose and demonstrate numerically plasmonic backcontact grating architectures. Simon, L. Escoubas, P. Torchio, J. L. Rouzo, and S. Vedraine, "Light harvesting in organic solar cells

Demir, Hilmi Volkan

91

Study on Characteristics of Ultra-Long-Period Fiber Gratings Written by High-Frequency CO2 Laser Pulses  

Science Journals Connector (OSTI)

A novel ultra-long-period fiber grating with periods of up to several millimeters induced by high-frequency

Zhu, Tao; Rao, Yunjiang; Mo, Qiu-Ju

92

A simple scanning spectrometer based on a stretchable elastomeric reflective grating  

SciTech Connect (OSTI)

We report a scanning optical spectrometer based on the use of a stretchable elastomeric reflective grating. The grating is obtained by supersonic cluster beam implantation of silver nanoparticles on polydimethylsiloxane previously grooved by molding to create a replica of a commercial digital versatile disk grating. The use of a stretchable grating allows the spectrometer spanning the whole optical wavelength range by solely extending the diffraction element by more than 100% of its original dimensions. The stretchable reflective optical grating shows excellent performances and stability upon thousands of stretching cycles. The use of this elastomeric element makes the optical layout and the mechanics of the spectrometer extremely simple and advantageous for those applications where spectral resolution is not a major requirement. As a proof of principle, we present the absorption spectrum of Rhodamine B in solution obtained by our spectrometer and compared to commercial instruments.

Ghisleri, C.; Milani, P., E-mail: paolo.milani@mi.infn.it [CIMAINA and Dipartimento di Fisica, Universit di Milano, via Celoria 16, 20133 Milano (Italy); WISE srl, Piazza Duse 2, 20122 Milano (Italy); Potenza, M. A. C.; Bellacicca, A. [CIMAINA and Dipartimento di Fisica, Universit di Milano, via Celoria 16, 20133 Milano (Italy); Ravagnan, L. [WISE srl, Piazza Duse 2, 20122 Milano (Italy)

2014-02-10T23:59:59.000Z

93

Flexible organic solar cells including efficiency enhancing grating structures  

Science Journals Connector (OSTI)

In this work, a new method for the fabrication of organic solar cells containing functional light-trapping nanostructures on flexible substrates is presented. Polyimide is spin-coated on silicon support substrates, enabling standard micro- and nanotechnology fabrication techniques, such as photolithography and electron-beam lithography, besides the steps required for the bulk-heterojunction organic solar cell fabrication. After the production steps, the solar cells on polyimide are peeled off the silicon support substrates, resulting in flexible devices containing nanostructures for light absorption enhancement. Since the solar cells avoid using brittle electrodes, the performance of the flexible devices is not affected by the peeling process. We have investigated three different nanostructured grating designs and conclude that gratings with a 500?nm pitch distance have the highest light-trapping efficiency for the selected active layer material (P3HT:PCBM), resulting in an enhancement of about 34% on the solar cell efficiency. The presented method can be applied to a large variety of flexible nanostructured devices in future applications.

Roana Melina de Oliveira Hansen; Yinghui Liu; Morten Madsen; Horst-G?nter Rubahn

2013-01-01T23:59:59.000Z

94

TE Connectivity Finds Answers in Tomography  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

TE Connectivity Finds Answers in TE Connectivity Finds Answers in Tomography TE Connectivity Finds Answers in Tomography Print Thursday, 22 August 2013 10:50 TE Connectivity is a world leader in connectivity-the $13 billion global company designs and manufactures more than 500,000 different electronic connectivity products for the automotive, energy, industrial, broadband communications, consumer device, healthcare, aerospace, and defense industries. TE Connectivity has a long-standing commitment to innovation and engineering excellence. Their products help address challenges arising from companies' need for energy efficiency, always-on communications, and ever-increasing productivity. Recently, a team led by TE's senior manager of materials development, Dr. Jerzy Gazda (at left), has been investigating how ALS tomography capabilities can help the company develop more efficient connectors.

95

Transmission Grating Spectrometer for Constellation-X White paper response to NASA solicitation 210S-GBG-06-001  

E-Print Network [OSTI]

1 Transmission Grating Spectrometer for Constellation-X White paper response to NASA solicitation proposes a transmission grating spectrometer to provide high spectral resolution at low energies, extending down below 0.2 keV. The transmission grating is blazed, concentrating the energy among a single set

Heilmann, Ralf

96

2346 IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 17, NO. 11, NOVEMBER 2005 Polarization Properties of Long-Period Gratings  

E-Print Network [OSTI]

-photon absorption mechanism. Due to energy deposition in the fiber cladding, such gratings are similar to those fabricated by CO2 laser induced heating, mechanical pres- sure, or electric arc. We found that these gratings exhibit significant polarization properties. Index Terms--Gratings, laser excitation, neodimiun : glass

Nikogosyan, David N.

97

Mathematical Modeling and Experimental Study of Biomass Combustion in a Thermal 108 MW Grate-Fired Boiler  

E-Print Network [OSTI]

Mathematical Modeling and Experimental Study of Biomass Combustion in a Thermal 108 MW Grate, the noncontinuous biomass feeding and grate movement, the combustion instabilities inside the fuel bed used to fire biomass for heat and power production. However, grate-firing systems are often reported

Rosendahl, Lasse

98

Si, CdTe and CdZnTe radiation detectors for imaging applications.  

E-Print Network [OSTI]

??The structure and operation of CdTe, CdZnTe and Si pixel detectors based on crystalline semiconductors, bump bonding and CMOS technology and developed mainly at Oy (more)

Schulman, Tom

2006-01-01T23:59:59.000Z

99

High efficiency multilayer blazed gratings for EUV and soft X-rays: Recent developments  

SciTech Connect (OSTI)

Multilayer coated blazed gratings with high groove density are the best candidates for use in high resolution EUV and soft x-ray spectroscopy. Theoretical analysis shows that such a grating can be potentially optimized for high dispersion and spectral resolution in a desired high diffraction order without significant loss of diffraction efficiency. In order to realize this potential, the grating fabrication process should provide a perfect triangular groove profile and an extremely smooth surface of the blazed facets. Here we report on recent progress achieved at the Advanced Light Source (ALS) in fabrication of high quality multilayer coated blazed gratings. The blazed gratings were fabricated using scanning beam interference lithography followed by wet anisotropic etching of silicon. A 200 nm period grating coated with a Mo/Si multilayer composed with 30 bi-layers demonstrated an absolute efficiency of 37.6percent in the 3rd diffraction order at 13.6 nm wavelength. The groove profile of the grating was thoroughly characterized with atomic force microscopy before and after the multilayer deposition. The obtained metrology data were used for simulation of the grating efficiency with the vector electromagnetic PCGrate-6.1 code. The simulations showed that smoothing of the grating profile during the multilayer deposition is the main reason for efficiency losses compared to the theoretical maximum. Investigation of the grating with cross-sectional transmission electron microscopy revealed a complex evolution of the groove profile in the course of the multilayer deposition. Impact of the shadowing and smoothing processes on growth of the multilayer on the surface of the sawtooth substrate is discussed.

Voronov, Dmitriy; Ahn, Minseung; Anderson, Erik; Cambie, Rossana; Chang, Chih-Hao; Goray, Leonid; Gullikson, Eric; Heilmann, Ralf; Salmassi, Farhad; Schattenburg, Mark; Warwick, Tony; Yashchuk, Valeriy; Padmore, Howard

2011-07-26T23:59:59.000Z

100

Recycling of CdTe photovoltaic waste  

DOE Patents [OSTI]

A method for extracting and reclaiming metals from scrap CdTe photovoltaic cells and manufacturing waste by leaching the waste with a leaching solution comprising nitric acid and water, skimming any plastic material from the top of the leaching solution, separating the glass substrate from the liquid leachate and electrolyzing the leachate to separate Cd from Te, wherein the Te is deposits onto a cathode while the Cd remains in solution.

Goozner, Robert E. (Charlotte, NC); Long, Mark O. (Charlotte, NC); Drinkard, Jr., William F. (Charlotte, NC)

1999-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

Recycling ZnTe, CdTe, and Other Compound Semiconductors by Ambipolar Electrolysis  

E-Print Network [OSTI]

The electrochemical behavior of ZnTe and CdTe compound semiconductors dissolved in molten ZnCl[subscript 2] and equimolar CdCl[subscript 2]KCl, respectively, was examined. In these melts dissolved Te is present as the ...

Osswald, Sebastian

102

Semitransparent ultrathin CdTe solar cells Semitransparent ultrathin CdTe solar cells and durabilityand durability  

E-Print Network [OSTI]

Semitransparent ultrathin CdTe solar cells Semitransparent ultrathin CdTe solar cells core technology is built around · sputter deposition · CdS/CdTe cell structure · Extensive IPTe cellsultrathin CdTe cells X26 stateoftheart compared with other CdTe deposition: [X26 technology has been

Rollins, Andrew M.

103

Response of Cds/CdTe Devices to Te Exposure of Back Contact: Preprint  

SciTech Connect (OSTI)

Theoretical predictions of thin-film CdS/CdTe photovoltaic (PV) devices have suggested performance may be improved by reducing recombination due to Te-vacancy (VTe) or Te-interstitial (Tei) defects. Although formation of these intrinsic defects is likely influenced by CdTe deposition parameters, it also may be coupled to formation of beneficial cadmium vacancy (VCd) defects. If this is true, reducing potential effects of VTe or Tei may be difficult without also reducing the density of VCd. In contrast, post-deposition processes can sometimes afford a greater degree of defect control. Here we explore a post-deposition process that appears to influence the Te-related defects in polycrystalline CdTe. Specifically, we have exposed the CdTe surface to Te prior to ZnTe:Cu/Ti contact-interface formation with the goal of reducing VTe but without significantly reducing VCd. Initial results show that when this modified contact is used on a CdCl2-treated CdS/CdTe device, significantly poorer device performance results. This suggests two things: First, the amount of free-Te available during contact formation (either from chemical etching or CuTe or ZnTe deposition) may be a more important parameter to device performance than previously appreciated. Second, if processes have been used to reduce the effect of VTe (e.g., oxygen and chlorine additions to the CdTe), adding even a small amount of Te may produce detrimental defects.

Gessert, T. A.; Burst, J. M.; Ma, J.; Wei, S. H.; Kuciauskas, D.; Barnes, T. M.; Duenow, J. N.; Young, M. R.; Rance, W. L.; Li, J. V.; Dippo, P.

2012-06-01T23:59:59.000Z

104

Nanomechanical near-field grating apparatus and acceleration sensor formed therefrom  

DOE Patents [OSTI]

A nanomechanical near-field grating device is disclosed which includes two sub-gratings vertically spaced by a distance less than or equal to an operating wavelength. Each sub-grating includes a plurality of line-elements spaced apart by a distance less than or equal to the operating wavelength. A light source (e.g., a VCSEL or LED) can provide light at the operating wavelength for operation of the device. The device can operate as an active grating, with the intensity of a reflected or transmitted portion of the light varying as the relative positions of the sub-gratings are controlled by an actuator. The device can also operate as a passive grating, with the relative positions of the sub-gratings changing in response to an environmentally-induced force due to acceleration, impact, shock, vibration, gravity, etc. Since the device can be adapted to sense an acceleration that is directed laterally or vertically, a plurality of devices can be located on a common substrate to form a multi-axis acceleration sensor.

Carr, Dustin Wade (Albuquerque, NM); Bogart, Gregory Robert (Corrales, NM); Keeler, Bianca E. N. (Albuquerque, NM)

2008-03-04T23:59:59.000Z

105

High-efficiency, dielectric multilayer gratings optimized for manufacturability and laser damage threshold  

SciTech Connect (OSTI)

Ultrashort pulse, high-intensity lasers offer new opportunities for the study of light-matter interaction and for inertial confinement fusion. A 100 Terawatt laser operating 400 fs and 1.053 {mu}m is operational at LLNL, and a 1000 Terawatt (Petawatt) laser will come online in early 1996. These lasers use large-aperture (40 cm and 94 cm diameter, respectively) diffraction gratings to compress the amplified laser pulse. At present, hologrphically produced, gold overcoated photoresist gratings are used: these gratings represent the fuse in the laser chain. Higher laser damage thresholds and higher diffraction efficiencies are theoretically possible with multilayer dielectric gratings (MDG`s). A number of design parameters regarding both the multilayer stack and the etched grating structure can be optimized to maximize the laser damage threshold and also improve the processing latitude for the interference lithography and reactive ion etching steps used during manufacture of these gratings. This paper presents model predictions for the behavior of hafnia/silica MDG`s both during processing and in operation, and presents experimental data on the diffraction efficiency and short- pulse laser damage threshold for optimized witness gratings.

Britten, J.A.; Perry, M.D.; Shore, B.W.; Boyd, R.D.; Loomis, G.E.; Chow, R.

1995-11-29T23:59:59.000Z

106

Improvement of Laser Damage Resistance and Diffraction Efficiency of Multilayer Dielectric Diffraction Gratings by HF-Etchback Linewidth Tailoring  

SciTech Connect (OSTI)

Multilayer dielectric (MLD) diffraction gratings for Petawatt-class laser systems possess unique laser damage characteristics. Details of the shape of the grating lines and the concentration of absorbing impurities on the surface of the grating structures both have strong effects on laser damage threshold. It is known that electric field enhancement in the solid material comprising the grating lines varies directly with the linewidth and inversely with the line height for equivalent diffraction efficiency. Here, they present an overview of laser damage characteristics of MLD gratings, and describe a process for post-processing ion-beam etched grating lines using very dilute buffered hydrofluoric acid solutions. This process acts simultaneously to reduce grating linewidth and remove surface contaminants, thereby improving laser damage thresholds through two pathways.

Nguyen, H T; Larson, C C; Britten, J A

2010-10-28T23:59:59.000Z

107

Second-order Bragg gratings in single-mode chalcogenide fibres  

SciTech Connect (OSTI)

Bragg gratings with a second-order resonance wavelength in the near-IR spectral region have been inscribed into single-mode chalcogenide (As{sub 2}S{sub 3}) glass fibre by a He - Ne laser beam using a configuration typical of Bragg grating fabrication in germanosilicate fibre, with the use of a phase mask that ensures effective diffraction of the writing light into the +1 and -1 orders. The spectra of the inscribed gratings show no resonances due to cladding mode excitation because the cladding material is photosensitive. (fibre optics)

Bernier, M; Asatryan, K E; Vallee, R; Galstian, T M; Vasil'ev, Sergei A; Medvedkov, O I; Plotnichenko, V G; Gnusin, P I; Dianov, Evgenii M

2011-05-31T23:59:59.000Z

108

High performance Zintl phase TE materials with embedded nanoparticles...  

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

performance Zintl phase TE materials with embedded nanoparticles High performance Zintl phase TE materials with embedded nanoparticles Performance of zintl phase thermoelectric...

109

CdSxTe1-x Alloying in CdS/CdTe Solar Cells  

SciTech Connect (OSTI)

A CdS{sub x}Te{sub 1-x} layer forms by interdiffusion of CdS and CdTe during the fabrication of thin film CdTe photovoltaic (PV) devices. The CdS{sub x}Te{sub 1-x} layer is thought to be important because it relieves strain at the CdS/CdTe interface that would otherwise exist due to the 10% lattice mismatch between these two materials. Our previous work has indicated that the electrical junction is located in this interdiffused CdS{sub x}Te{sub 1-x} region. Further understanding, however, is essential to predict the role of this CdS{sub x}Te{sub 1-x} layer in the operation of CdS/CdTe devices. In this study, CdS{sub x}Te{sub 1-x} alloy films were deposited by radio-frequency magnetron sputtering and coevaporation from CdTe and CdS sources. Both radio-frequency-magnetron-sputtered and coevaporated CdS{sub x}Te{sub 1-x} films of lower S content (x < 0.3) have a cubic zincblende (ZB) structure akin to CdTe, whereas those of higher S content have a hexagonal wurtzite (WZ) structure like that of CdS. Films become less preferentially oriented as a result of a CdCl{sub 2} heat treatment at {approx}400 C for 5 min. Films sputtered in a 1% O{sub 2}/Ar ambient are amorphous as deposited, but show CdTe ZB, CdS WZ, and CdTe oxide phases after a CdCl{sub 2} heat treatment. Films sputtered in O{sub 2} partial pressure have a much wider bandgap than expected. This may be explained by nanocrystalline size effects seen previously for sputtered oxygenated CdS (CdS:O) films.

Duenow, J. N.; Dhere, R. G.; Moutinho, H. R.; To, B.; Pankow, J. W.; Kuciauskas, D.; Gessert, T. A.

2011-01-01T23:59:59.000Z

110

Energy loss rate of a charged particle in HgTe/(HgTe, CdTe) quantum wells  

SciTech Connect (OSTI)

The energy loss rate (ELR) of a charged particle in a HgTe/(HgTe, CdTe) quantum well is investigated. We consider scattering of a charged particle by the bulk insulating states in this type of topological insulator. It is found that the ELR characteristics due to the intraband excitation have a linear energy dependence while those due to interband excitation depend on the energy exponentially. An interesting quantitative result is that for a large range of the incident energy, the mean inelastic scattering rate is around a few terahertz.

Chen, Qinjun; Sin Ang, Yee [School of Physics, University of Wollongong, New South Wales 2522 (Australia)] [School of Physics, University of Wollongong, New South Wales 2522 (Australia); Wang, Xiaolin [Institute for Superconducting and Electronic Materials, University of Wollongong, New South Wales 2522 (Australia)] [Institute for Superconducting and Electronic Materials, University of Wollongong, New South Wales 2522 (Australia); Lewis, R. A.; Zhang, Chao [School of Physics, University of Wollongong, New South Wales 2522 (Australia) [School of Physics, University of Wollongong, New South Wales 2522 (Australia); Institute for Superconducting and Electronic Materials, University of Wollongong, New South Wales 2522 (Australia)

2013-11-04T23:59:59.000Z

111

Microfabrication of Optically Flat Silicon Micro-Mirrors for Fully Programmable Micro-Diffraction Gratings  

E-Print Network [OSTI]

We have fabricated and characterized a Fully Programmable Micro-Diffraction Grating (FPMDG) with 64 silicon micro-mirrors for spectral shaping in the visible and near-infrared wavelength range. The FPMDG arrays of 50 ?m ...

Timotijevic, B.

2012-01-01T23:59:59.000Z

112

Small blaze angle gratings with various surface treatments for use in the extreme ultraviolet  

Science Journals Connector (OSTI)

Three replica gratings were made from a single master; two were epoxy overcoated with different thicknesses of gold, and one was replicated directly in gold. Their performance in EUV...

Miller, Anne; Jelinsky, Patrick; Bowyer, Stuart; Welsh, Barry Y

1989-01-01T23:59:59.000Z

113

High-order diffraction gratings for high-power semiconductor lasers  

SciTech Connect (OSTI)

A deep diffraction grating with a large period ({approx}2 {mu}m) within one of the cladding layers is proposed for the implementation of selective feedback in a semiconductor laser. Frequency dependences of reflectance in the 12th diffraction order for rectangular, triangular, and trapezoidal diffraction gratings are calculated. It is shown that the maximum reflectance of the waveguide mode is attained using a rectangular or trapezoidal grating {approx}2 {mu}m deep in the laser structure. Deep trapezoidal diffraction gratings with large periods are fabricated in the Al{sub 0.3}Ga{sub 0.7}As cladding layer of a GaAs/AlGaAs laser structure using photolithography and reactive ion etching.

Vasil'eva, V. V.; Vinokurov, D. A.; Zolotarev, V. V.; Leshko, A. Yu.; Petrunov, A. N.; Pikhtin, N. A.; Rastegaeva, M. G.; Sokolova, Z. N., E-mail: Zina.Sokolova@mail.ioffe.ru; Shashkin, I. S.; Tarasov, I. S. [Russian Academy of Sciences, Ioffe Physical Technical Institute (Russian Federation)

2012-02-15T23:59:59.000Z

114

Simulation of Energy Conversion Efficiency of a Solar Cell with Gratings  

Science Journals Connector (OSTI)

In this work, a numerical analysis of a CIGS (CuIn1-xGaxSex) solar cell with a rectangular grating on the electrode is presented. The effects of...

Kim, Sung-Chul; Sohn, In-Soo

2010-01-01T23:59:59.000Z

115

A Soft X-ray Spectrometer using a Highly Dispersive Multilayer Grating  

SciTech Connect (OSTI)

There is a need for higher resolution spectrometers as a tool for inelastic x-ray scattering. Currently, resolving power around R = 10,000 is advertised. Measured RIXS spectra are often limited by this instrumental resolution and higher resolution spectrometers using conventional gratings would be prohibitively large. We are engaged in a development program to build blazed multilayer grating structures for diffracting soft x-rays in high order. This leads to spectrometers with dispersion much higher than is possible using metal coated-gratings. The higher dispersion then provides higher resolution and the multilayer gratings are capable of operating away from grazing incidence as required. A spectrometer design is presented with a total length 3.8 m and capable of 10{sup 5} resolving power.

Warwick, Tony; Padmore, Howard; Voronov, Dmitriy; Yashchuk, Valeriy [Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA94720 (United States)

2010-06-23T23:59:59.000Z

116

Energy Exchange between Light Waves on Local Photorefractive Grating in a Cubic Gyrotropic Crystal  

Science Journals Connector (OSTI)

Steady-state two-wave interaction on a local photorefractive grating formed in a cubic gyrotropic crystal with applied constant electric field is considered. The analytical solution is...

Litvinov, R V

117

Elimination of higher-order diffraction using zigzag transmission grating in soft x-ray region  

SciTech Connect (OSTI)

We present a realization of the sinusoidal transmission function using a series of zigzag-profiled strips where the transmission takes on the binary values 0 and 1 in a two-dimensional distribution. A zigzag transmission grating of 1000 line/mm has been fabricated and demonstrated on the soft x-ray beam of synchrotron radiation. The axial single-order diffraction indicates that the zigzag transmission grating is adequate for spectroscopic application.

Zang, H. P.; Wang, C. K. [Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan 621900 (China); Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065 (China); Gao, Y. L.; Zhou, W. M.; Kuang, L. Y.; Wei, L.; Fan, W.; Zhang, W. H.; Zhao, Z. Q.; Cao, L. F.; Gu, Y. Q.; Zhang, B. H. [Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan 621900 (China); Jiang, G. [Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065 (China); Zhu, X. L.; Xie, C. Q. [Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029 (China); Zhao, Y. D.; Cui, M. Q. [Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)

2012-03-12T23:59:59.000Z

118

Recycling of CdTe photovoltaic waste  

DOE Patents [OSTI]

A method for extracting and reclaiming metals from scrap CdTe photovoltaic cells and manufacturing waste by leaching the metals in dilute nitric acid, leaching the waste with a leaching solution comprising nitric acid and water, skimming any plastic material from the top of the leaching solution, separating the glass substrate from the liquid leachate, adding a calcium containing base to the leachate to precipitate Cd and Te, separating the precipitated Cd and Te from the leachate, and recovering the calcium-containing base.

Goozner, Robert E. (Charlotte, NC); Long, Mark O. (Charlotte, NC); Drinkard, Jr., William F. (Charlotte, NC)

1999-04-27T23:59:59.000Z

119

Experimental observation of acoustic sub-harmonic diffraction by a grating  

SciTech Connect (OSTI)

A diffraction grating is a spatial filter causing sound waves or optical waves to reflect in directions determined by the frequency of the waves and the period of the grating. The classical grating equation is the governing principle that has successfully described the diffraction phenomena caused by gratings. However, in this work, we show experimental observation of the so-called sub-harmonic diffraction in acoustics that cannot be explained by the classical grating equation. Experiments indicate two physical phenomena causing the effect: internal scattering effects within the corrugation causing a phase shift and nonlinear acoustic effects generating new frequencies. This discovery expands our current understanding of the diffraction phenomenon, and it also makes it possible to better design spatial diffraction spectra, such as a rainbow effect in optics with a more complicated color spectrum than a traditional rainbow. The discovery reveals also a possibly new technique to study nonlinear acoustics by exploitation of the natural spatial filtering effect inherent to an acoustic diffraction grating.

Liu, Jingfei, E-mail: benjamin.jf.liu@gatech.edu; Declercq, Nico F., E-mail: declercqdepatin@gatech.edu [Laboratory for Ultrasonic Nondestructive Evaluation LUNE, Georgia Tech Lorraine, Georgia Tech-CNRS UMI2958, Georgia Institute of Technology, 2, rue Marconi, Metz 57070 (France)

2014-06-28T23:59:59.000Z

120

Infrared spectroscopy of lattice vibrations in ZnTe/CdTe superlattices with quantum dots on the GaAs substrate with the ZnTe buffer layer  

SciTech Connect (OSTI)

The results of the analysis of the infrared lattice reflectance spectra of multiperiod ZnTe/CdTe superlattices with CdTe quantum dots are reported. The samples are grown by molecular beam epitaxy on the GaAs substrate with the ZnTe buffer layer. Due to the large number of periods of the superlattices, it is possible to observe CdTe-like vibration modes in the quantum dots, i.e., the dislocation-free stressed islands formed during the growth due to relaxation of elastic stresses between the ZnTe and CdTe layers are markedly different in their lattice parameters. From the frequency shifts of the CdTe- and ZnTe-like vibration modes with respect to the corresponding modes in the unstressed materials, it is possible to estimate the level of elastic stresses.

Kozyrev, S. P. [Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)], E-mail: skozyrev@sci.lebedev.ru

2009-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

Formation and optical properties of CdTe/ZnTe nanostructures with different CdTe thicknesses grown on Si (100) substrates  

SciTech Connect (OSTI)

Atomic force microscopy (AFM) and photoluminescence (PL) measurements were carried out to investigate the formation and the optical properties of CdTe/ZnTe nanostructures with various CdTe thicknesses grown on Si (100) substrates by using molecular beam epitaxy and atomic layer epitaxy. AFM images showed that uniform CdTe/ZnTe quantum dots with a CdTe layer thickness of 2.5 ML (monolayer) were formed on Si (100) substrates. The excitonic peaks corresponding to transitions from the ground electronic subband to the ground heavy-hole band in the CdTe/ZnTe nanostructures shifted to a lower energy with increasing thickness of the CdTe layer. The activation energies of the carriers confined in the CdTe/ZnTe nanostructures grown on Si (100) substrates were obtained from the temperature-dependent PL spectra. The present observations can help improve understanding of the formation and the optical properties in CdTe/ZnTe nanostructures with different CdTe thicknesses grown on Si (100) substrates.

Lee, H. S.; Park, H. L.; Lee, I.; Kim, T. W. [Department of Physics, Yonsei University, Seoul 120-749 (Korea, Republic of); Advanced Semiconductor Research Center, Division of Electronics and Computer Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791 (Korea, Republic of)

2007-11-15T23:59:59.000Z

122

Growth and optical properties of CdTe quantum dots in ZnTe nanowires  

SciTech Connect (OSTI)

We report on the formation of optically active CdTe quantum dots in ZnTe nanowires. The CdTe/ZnTe nanostructures have been grown by a gold nanocatalyst assisted molecular beam epitaxy in a vapor-liquid solid growth process. The presence of CdTe insertions in ZnTe nanowire results in the appearance of a strong photoluminescence band in the 2.0 eV-2.25 eV energy range. Spatially resolved photoluminescence measurements reveal that this broad emission consists of several sharp lines with the spectral width of about 2 meV. The large degree of linear polarization of these individual emission lines confirms their nanowire origin, whereas the zero-dimensional confinement is proved by photon correlation spectroscopy.

Wojnar, Piotr; Janik, Elzbieta; Baczewski, Lech T.; Kret, Slawomir; Karczewski, G.; Wojtowicz, Tomasz [Institute of Physics, Polish Academy of Sciences, Al Lotnikow 32/46, 02-668 Warsaw (Poland); Goryca, Mateusz; Kazimierczuk, Tomasz; Kossacki, Piotr [Institute of Experimental Physics, Faculty of Physics, University of Warsaw, ul Hoza 69, 00-681 Warsaw (Poland)

2011-09-12T23:59:59.000Z

123

Charge transfer in liquid semiconductors: The K-Te system  

Science Journals Connector (OSTI)

The neutron diffraction patterns of molten KxTe1-x alloys for x=0.12 and x-0.50 demonstrate the persistence of covalently bonded tellurium in the liquid. In the case of liquid K0.12Te0.88, the measured structure is domianted by the Te-Te contribution, and is remarkably similar to that of pure liquid tellurium. The equiatomic alloy K0.50Te0.50 is shown to contain mostly Te pairs which are identified with Zintl ions, Te22-. The presence of these ions explains the semiconducting behavior of these alloys deduced from recent electrical transport measurements.

J. Fortner, Marie-Louise Saboungi, and J. E. Enderby

1992-08-31T23:59:59.000Z

124

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

SciTech Connect (OSTI)

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

125

ZnTe: Gibbs free energy  

Science Journals Connector (OSTI)

This document is part of Volume 44 Semiconductors, Subvolume B New Data and Updates for II-VI Compounds of Landolt-Brnstein Group III Condensed Matter. It contains data on ZnTe (zinc telluride), Element...

J. Gutowski; K. Sebald; T. Voss

2009-01-01T23:59:59.000Z

126

Exposure Time Calculator for Immersion Grating Infrared Spectrograph: IGRINS  

E-Print Network [OSTI]

We present an exposure-time calculator (ETC) for the Immersion Grating Infrared Spectrograph (IGRINS). The signal and noise values are calculated by taking into account the telluric background emission and absorption, the emission and transmission of the telescope and instrument optics, and the dark current and read noise of the infrared detector arrays. For the atmospheric transmission, we apply models based on the amount of precipitable water vapor along the line of sight to the target. The ETC produces the expected signal-to-noise ratio (S/N) for each resolution element, given the exposure-time and number of exposures. In this paper, we compare the simulated continuum S/N for the early-type star HD 124683 and the late-type star GSS 32, and the simulated emission line S/N for the H2 rovibrational transitions from the Iris Nebula NGC 7023 with the observed IGRINS spectra. The simulated S/N from the ETC is overestimate by 10 - 15 % for the sample continuum targets.

Le, Huynh Anh N; Jaffe, Daniel T; Lee, Jae-Joon; Im, Myungshin; Kaplan, Kyle; Seifahrt, Andreas

2015-01-01T23:59:59.000Z

127

Active resonant subwavelength grating for scannerless range imaging sensors.  

SciTech Connect (OSTI)

In this late-start LDRD, we will present a design for a wavelength-agile, high-speed modulator that enables a long-term vision for the THz Scannerless Range Imaging (SRI) sensor. It takes the place of the currently-utilized SRI micro-channel plate which is limited to photocathode sensitive wavelengths (primarily in the visible and near-IR regimes). Two of Sandia's successful technologies--subwavelength diffractive optics and THz sources and detectors--are poised to extend the capabilities of the SRI sensor. The goal is to drastically broaden the SRI's sensing waveband--all the way to the THz regime--so the sensor can see through image-obscuring, scattering environments like smoke and dust. Surface properties, such as reflectivity, emissivity, and scattering roughness, vary greatly with the illuminating wavelength. Thus, objects that are difficult to image at the SRI sensor's present near-IR wavelengths may be imaged more easily at the considerably longer THz wavelengths (0.1 to 1mm). The proposed component is an active Resonant Subwavelength Grating (RSG). Sandia invested considerable effort on a passive RSG two years ago, which resulted in a highly-efficient (reflectivity greater than gold), wavelength-specific reflector. For this late-start LDRD proposal, we will transform the passive RSG design into an active laser-line reflector.

Kemme, Shanalyn A.; Nellums, Robert O.; Boye, Robert R.; Peters, David William

2006-11-01T23:59:59.000Z

128

Arrayed resonant subwavelength gratings : LDRD 38618 final report.  

SciTech Connect (OSTI)

This report describes a passive, optical component called resonant subwavelength gratings (RSGs), which can be employed as one element in an RSG array. An RSG functions as an extremely narrow wavelength and angular band reflector, or mode selector. Theoretical studies predict that the infinite, laterally-extended RSG can reflect 100% of the resonant light while transmitting the balance of the other wavelengths. Experimental realization of these remarkable predictions has been impacted primarily by fabrication challenges. Even so, we will present large area (1.0mm) RSG reflectivity as high as 100.2%, normalized to deposited gold. Broad use of the RSG will only truly occur in an accessible micro-optical system. This program at Sandia is a normal incidence array configuration of RSGs where each array element resonates with a distinct wavelength to act as a dense array of wavelength- and mode-selective reflectors. Because of the array configuration, RSGs can be matched to an array of pixels, detectors, or chemical/biological cells for integrated optical sensing. Micro-optical system considerations impact the ideal, large area RSG performance by requiring finite extent devices and robust materials for the appropriate wavelength. Theoretical predictions and experimental measurements are presented that demonstrate the component response as a function of decreasing RSG aperture dimension and off-normal input angular incidence.

Grotbeck, Carter L.; Kemme, Shanalyn A.; Wendt, Joel Robert; Warren, Mial E.; Samora, Sally; Carter, Tony Ray; Hadley, G. Ronald; Peters, David William

2003-11-01T23:59:59.000Z

129

Facultad de Ciencias Departamento de Fsica Te  

E-Print Network [OSTI]

Facultad de Ciencias Departamento de F??�sica Te ?? orica Jet production in charged current deep Ciencias F??�sicas'' by M ?? onica Luisa V ?? azquez Acosta Director : Juan Terr ?? on Cuadrado 16/12/2002 #12; #12; Facultad de Ciencias Departamento de F??�sica Te ?? orica Producci ?? on de chorros hadr ?? onicos en

130

GaTe semiconductor for radiation detection  

DOE Patents [OSTI]

GaTe semiconductor is used as a room-temperature radiation detector. GaTe has useful properties for radiation detectors: ideal bandgap, favorable mobilities, low melting point (no evaporation), non-hygroscopic nature, and availability of high-purity starting materials. The detector can be used, e.g., for detection of illicit nuclear weapons and radiological dispersed devices at ports of entry, in cities, and off shore and for determination of medical isotopes present in a patient.

Payne, Stephen A. (Castro Valley, CA); Burger, Arnold (Nashville, TN); Mandal, Krishna C. (Ashland, MA)

2009-06-23T23:59:59.000Z

131

CdTe AND CdTe : Hg ALLOYS CRYSTAL GROWTH USING STOICHIOMETRIC AND OFF-STOICHIOMETRIC  

E-Print Network [OSTI]

123 CdTe AND CdTe : Hg ALLOYS CRYSTAL GROWTH USING STOICHIOMETRIC AND OFF-STOICHIOMETRIC ZONE.-Briand, 92190 Meudon/Bellevue, France Résumé. 2014 En vue de la croissance de cristaux de CdTe de haute cristaux semi-isolants Cd0, 9Hg0, 1Te. Abstract. 2014 Some aspects of the thermodynamic state of CdTe

Paris-Sud XI, Université de

132

Mass production of volume phase holographic gratings for the VIRUS spectrograph array  

E-Print Network [OSTI]

The Visible Integral-field Replicable Unit Spectrograph (VIRUS) is a baseline array of 150 copies of a simple, fiber-fed integral field spectrograph that will be deployed on the Hobby-Eberly Telescope (HET). VIRUS is the first optical astronomical instrument to be replicated on an industrial scale, and represents a relatively inexpensive solution for carrying out large-area spectroscopic surveys, such as the HET Dark Energy Experiment (HETDEX). Each spectrograph contains a volume phase holographic (VPH) grating with a 138 mm diameter clear aperture as its dispersing element. The instrument utilizes the grating in first-order for 350-550 nm. Including witness samples, a suite of 170 VPH gratings has been mass produced for VIRUS. Here, we present the design of the VIRUS VPH gratings and a discussion of their mass production. We additionally present the design and functionality of a custom apparatus that has been used to rapidly test the first-order diffraction efficiency of the gratings for various discrete wav...

Chonis, Taylor S; Hill, Gary J; Clemens, J Christopher; Lee, Hanshin; Tuttle, Sarah E; Adams, Joshua J; Marshall, J L; DePoy, D L; Prochaska, Travis

2014-01-01T23:59:59.000Z

133

Improved algorithm for processing grating-based phase contrast interferometry image sets  

SciTech Connect (OSTI)

Grating-based X-ray and neutron interferometry tomography using phase-stepping methods generates large data sets. An improved algorithm is presented for solving for the parameters to calculate transmissions, differential phase contrast, and dark-field images. The method takes advantage of the vectorization inherent in high-level languages such as Mathematica and MATLAB and can solve a 16 1k 1k data set in less than a second. In addition, the algorithm can function with partial data sets. This is demonstrated with processing of a 16-step grating data set with partial use of the original data chosen without any restriction. Also, we have calculated the reduced chi-square for the fit and notice the effect of grating support structural elements upon the differential phase contrast image and have explored expanded basis set representations to mitigate the impact.

Marathe, Shashidhara, E-mail: marathe@aps.anl.gov; Assoufid, Lahsen, E-mail: assoufid@aps.anl.gov; Xiao, Xianghui, E-mail: xhxiao@aps.anl.gov [Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439 (United States)] [Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439 (United States); Ham, Kyungmin, E-mail: kham1@lsu.edu [CAMD, LSU, Baton Rouge, Louisiana 70806 (United States)] [CAMD, LSU, Baton Rouge, Louisiana 70806 (United States); Johnson, Warren W., E-mail: johnson@ligo.phys.lsu.edu [Department of Physics and Astronomy, LSU, Baton Rouge, Louisiana 70803 (United States); Butler, Leslie G., E-mail: lbutler@lsu.edu [Department of Chemistry, LSU, Baton Rouge, Louisiana 70803 (United States)

2014-01-15T23:59:59.000Z

134

Effective Absorption Enhancement in Small Molecule Organic Solar Cells by Employing Trapezoid Gratings  

E-Print Network [OSTI]

We demonstrate the optical absorption has been enhanced in the small molecule organic solar cells by employing trapezoid grating structure. The enhanced absorption is mainly attributed to both waveguide modes and surface plasmon modes, which has been simulated by using finite-difference time-domain method. The simulated results show that the surface plasmon along the semitransparent metallic Ag anode is excited by introducing the periodical trapezoid gratings, which induce high intensity field increment in the donor layer. Meanwhile, the waveguide modes result a high intensity field in acceptor layer. The increment of field improves the absorption of organic solar cells, significantly, which has been demonstrated by simulating the electrical properties. The simulated results exhibiting 31 % increment of the short-circuit current has been achieved in the optimized device, which is supported by the experimental measurement. The power conversion efficiency of the grating sample obtained in experiment exhibits an...

Chun-Ping, Xiang; Yu, Jin; Bin-Zong, Xu; Wei-Min, Wang; Xin, Wei; Guo-Feng, Song; Yun, Xu

2013-01-01T23:59:59.000Z

135

Bend-insensitive ultra short long-period gratings by the electric arc method and their applications to harsh environment sensing and communication  

Science Journals Connector (OSTI)

Ultra short long-period gratings (LPGs) fabricated using the electric arc discharge method are demonstrated with regular single-mode fibers. The gratings were as short as two...

Nam, Sung; Zhan, Chun; Lee, Jon; Hahn, Corey; Reichard, Karl; Ruffin, Paul; Deng, Kung-Li; Yin, Shizhuo

2005-01-01T23:59:59.000Z

136

Fabrication of large area 100 nm pitch grating by spatial frequency doubling and nanoimprint lithography for subwavelength  

E-Print Network [OSTI]

Fabrication of large area 100 nm pitch grating by spatial frequency doubling and nanoimprint nm pitch gratings over a large area 10 cm2 using a simple, low-cost, fast process. This method doubling and 2 pattern replication using nanoimprint lithography. The form birefringence of a 100 nm pitch

137

Cryogenic tests of volume-phase holographic gratings: results at 100 K  

E-Print Network [OSTI]

We present results from cryogenic tests of Volume-Phase Holographic(VPH) gratings at 100 K. The aims of these tests are to see whether the diffraction efficiency as a function of wavelength is significantly different at a low temperature from that at room temperature and to see how the performance of a VPH grating is affected by a number of thermal cycles. We have completed 10 cycles between room temperature and 100 $K$, and find no clear evidence that the diffraction efficiency changes with temperature or with successive thermal cycle.

Naoyuki Tamura; Graham J. Murray; Peter Luke; Colin Blackburn; David J. Robertson; Nigel A. Dipper; Ray M. Sharples; Jeremy R. Allington-Smith

2006-09-04T23:59:59.000Z

138

X-ray Phase Imaging Microscopy using a Fresnel Zone Plate and a Transmission Grating  

SciTech Connect (OSTI)

We report on a hard X-ray phase imaging microscopy (a phase-difference microscopy) that consists of an objective and a transmission grating. The simple optical system provides a quantitative phase image, and does not need a wave field mostly coherent on the objective. Our method has a spatial resolution almost same as that of the absorption contrast microscope image obtained by removing the grating. We demonstrate how our approach provides a phase image from experimentally obtained images. Our approach is attractive for easily appending a quantitative phase-sensitive mode to normal X-ray microscopes, and has potentially broad applications in biology and material sciences.

Yashiro, Wataru; Momose, Atsushi [Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba, 277-8561 (Japan); Takeuchi, Akihisa; Suzuki, Yoshio [Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198 (Japan)

2010-06-23T23:59:59.000Z

139

Temperature dependence of plasmonic terahertz absorption in grating-gate gallium-nitride transistor structures  

Science Journals Connector (OSTI)

Strong plasmon resonances have been observed in the terahertz transmission spectra (15 THz) of large-area slit-grating-gate AlGaN/GaN-based high-electron-mobility transistor(HEMT) structures at temperatures from 10 to 170 K. The resonance frequencies correspond to the excitation of plasmons with wave vectors equal to the reciprocal lattice vectors of the metal grating which serves both as a gate electrode for the HEMT and a coupler between plasmons and incident terahertz radiation. Wide tunability of the resonances by the applied gate voltage demonstrates potential of these devices for terahertz applications.

A. V. Muravjov; D. B. Veksler; V. V. Popov; O. V. Polischuk; N. Pala; X. Hu; R. Gaska; H. Saxena; R. E. Peale; M. S. Shur

2010-01-01T23:59:59.000Z

140

Average resonance capture study of Te124  

Science Journals Connector (OSTI)

An average resonance capture study of Te124 was carried out by bombarding samples of Te123 with 2- and 24-keV neutron beams. The complete set of 0+, 1+, 2+ states disclosed by the experiment is consistent with the data of Robinson, Hamilton, and Snelling, demonstrating that there are no undetected states of these spins (especially 0+ states) below about 2500 keV. In particular, proposed 0+ levels at 1156 and 1290 keV are ruled out. This impacts various attempted interpretations in terms of intruder states, U(5), and O(6) symmetries.

R. F. Casten; J.-Y. Zhang; B.-C. Liao

1991-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

THE DEFECT STRUCTURE OF CdTe (*) F. A. KRGER  

E-Print Network [OSTI]

THE DEFECT STRUCTURE OF CdTe (*) F. A. KR?GER David Packard Professor of Electrical Engineering haute résistivité. Abstract. 2014 Evidence concerning the defect structure of CdTe is reviewed

Paris-Sud XI, Université de

142

PRESENT LIMITATIONS OF CdTe DETECTORS IN NUCLEAR MEDICINE  

E-Print Network [OSTI]

365 PRESENT LIMITATIONS OF CdTe DETECTORS IN NUCLEAR MEDICINE R. ALLEMAND, P. BOUTEILLER, M. LAVAL quality criteria, it is necessary to compare Cd-Te detectors results (or estimated characteristics) with other methods (i. e. 8cintillation cameras) in order to know the effective interest of Cd-Te in nuclear

Boyer, Edmond

143

Hybrid functional calculations of a Te antisite in bulk CdTe.  

E-Print Network [OSTI]

?? The detection of gamma-rays is an important issue in a cast array ofindustries. CdTe is a semiconductor used for gamma-ray detectors whichcan operate at (more)

rdal, Kristinn Bjrgvin

2013-01-01T23:59:59.000Z

144

Excited states of acceptors in CdTe and ZnTe  

Science Journals Connector (OSTI)

Higher excited states of acceptors in CdTe and ZnTe are obtained by using the Baldereschi and Lipari spherical model including the cubic correction and the central-cell effect. This is done by solving the coupled radial equations by the finite-element method with Arnoldi's algorithm, which gives several (?20) low-lying states simultaneously. Our procedure allows one to determine very accurately the host band-structure parameters. In the case of CdTe we obtain the Luttinger parameters ?1 = 5.30, ?2 = 1.62, ?3 = 2.10 and the dielectric constant ?0 = 9.3. For ZnTe we obtain ?1 = 3.80, ?2 = 0.86, ?3 = 1.32 and ?0 = 9.4.

M. Said; M.A. Kanehisa

1990-01-01T23:59:59.000Z

145

The PeTroleum InsTITuTe Annual report 2009 The PeTroleum InsTITuTe  

E-Print Network [OSTI]

The PeTroleum InsTITuTe Annual report 2009 The PeTroleum InsTITuTe Annual report - 2009 online version #12;The PeTroleum InsTITuTe Annual report 2009 #12;The PeTroleum InsTITuTe Annual report 2009 overvIew Annual Report 2009 THE PETROLEUM INSTITUTE Office of the President 4 OFFICE OF THE PRESIDENT DR

146

Influence of CdTe thickness on structural and electrical properties of CdTe/CdS solar cells  

E-Print Network [OSTI]

Influence of CdTe thickness on structural and electrical properties of CdTe/CdS solar cells A a b s t r a c ta r t i c l e i n f o Available online xxxx Keywords: Solar cells CdCl2 CdTe Thin absorbers Due to its high scalability and low production cost, CdTe solar cells have shown a very strong

Romeo, Alessandro

147

Typesetting Posters withTypesetting Posters with LaTeXLaTeX  

E-Print Network [OSTI]

Typesetting Posters withTypesetting Posters with LaTeXLaTeX:: A Practical GuideA Practical Guide?What is the Problem? ·· Posters are used to present technicalPosters are used to present technical material at some conferencesmaterial at some conferences ­­ In some cases these posters may be very largeIn some cases these posters

Stephenson, Ben

148

Mechanism of terahertz photoconductivity in semimetallic HgTe/CdHgTe quantum wells  

SciTech Connect (OSTI)

Terahertz photoconductivity in magnetic fields in semimetallic HgTe/CdHgTe quantum wells has been studied. The main contribution to photoconductivity comes from a signal that appears as a result of electron-gas heating. It is shown that, with the cyclotron resonance conditions satisfied, the photoconductivity signal is composed of cyclotron-resonance and bolometric components. However, in this case too, the bolometric contribution predominates.

Vasilyev, Yu. B., E-mail: yu.vasilyev@mail.ioffe.ru [Russian Academy of Sciences, Ioffe Physical-Technical Institute (Russian Federation); Mikhailov, N. N. [Russian Academy of Sciences, Rzhanov Institute of Semiconductor Physics, Siberian Branch (Russian Federation); Gouider, F. [Institut fuer Angewandte Physik (Germany); Vasilyeva, G. Yu. [St. Petersburg State Polytechnic University (Russian Federation); Nachtwei, G. [Institut fuer Angewandte Physik (Germany)

2012-05-15T23:59:59.000Z

149

Development of two-grating spectrometer for the charge exchange spectroscopy system on KSTAR  

SciTech Connect (OSTI)

The charge exchange spectroscopy (CES) system on Korea Superconducting Tokamak Advanced Research (KSTAR) was installed last year and had been applied to measure the C VI ion temperature and rotation velocity profiles. The ion temperature and rotation velocity profiles had been estimated from the C VI 5290.5 A (n = 8-7) charge-exchange spectrum signal measured by a Czerny-Turner type spectrometer and a thinned back-illuminated charge coupled device (CCD) camera. However, the Czerny-Turner type spectrometer used for the KSTAR CES system showed so low signal to noise ratio for KSTAR plasmas in the 2010 experimental campaign that the time resolution of the CES system had been limited to 100 ms due to the increased exposure time of the attached CCD camera. Then, new two-grating spectrometer had been developed in order to improve the time resolution of the CES system. The spectrometer consists of two gratings (1200 g/mm and 1800 g/mm each) with additive configuration, concave mirrors (f = 50 cm), and a cylindrical lens (f = 50 cm). The time resolution of the CES system increases by a factor of 2-4 with the two-grating spectrometer. The C VI ion temperature and rotation velocity profiles obtained by the two-grating spectrometer are compared to those by Czerny-Turner type spectrometer in this paper.

Lee, Hyungho [Department of Nuclear Fusion and Plasma Science, University of Science and Technology (UST), Gajungro 217, Daejeon 305-350 (Korea, Republic of); National Fusion Research Institute (NFRI), Gwahangno113, Daejeon 305-333 (Korea, Republic of); Song, Eun-ji; Oh, Soo-ghee [Division of Energy Systems Research, Ajou University, Suwon 443-749 (Korea, Republic of); Park, Young-dong [Department of Chemistry, Ajou University, Suwon 443-749 (Korea, Republic of); Ko, Won-Ha [National Fusion Research Institute (NFRI), Gwahangno113, Daejeon 305-333 (Korea, Republic of)

2011-06-15T23:59:59.000Z

150

Constructions and Analyses of Nonblocking WDM Switches Based on Arrayed Waveguide Grating and  

E-Print Network [OSTI]

(and heat dissipation) and large footprint (or space consump­ tion). As the optical device1 Constructions and Analyses of Nonblocking WDM Switches Based on Arrayed Waveguide Grating, qiao}@cse.buffalo.edu Abstract--- Constructing fast wavelength division multi­ plexing (WDM) switches

Ngo, Hung Q.

151

Force Sensing Robot Fingers using Embedded Fiber Bragg Grating Sensors and Shape Deposition Manufacturing  

E-Print Network [OSTI]

Force Sensing Robot Fingers using Embedded Fiber Bragg Grating Sensors and Shape Deposition@ifos.com Abstract-- Force sensing is an essential requirement for dexterous robot manipulation. Although strain robustness, design flexibility and immunity to electromagnetic noise. An exoskeletal force sensing robot

Park, Yong-Lae

152

Incorporation of nanovoids into metallic gratings for broadband plasmonic organic solar  

E-Print Network [OSTI]

Incorporation of nanovoids into metallic gratings for broadband plasmonic organic solar cells investigation and optimization of a newly proposed plasmonic organic solar cell geometry based. Kietzke, "Recent advances in organic solar cells," Adv. Optoelectron. 2007, 40285 (2007). 2. P. E. Shaw, A

Park, Namkyoo

153

Emergence of self-organized long-period fiber gratings in supercontinuum-generating  

E-Print Network [OSTI]

-order fiber cladding mode associated with the grating gains amplification at the expense of the fiber core the cladding mode(s) into which the waveguide scatters away the core mode [4]. The cladding mode(s) should, the cou- pling efficiency (CE) of cw probe light (produced by the cw operation of the writing laser

Boppart, Stephen

154

Discriminability of Real and Virtual Surfaces with Triangular Gratings Matthew Kocsis*  

E-Print Network [OSTI]

be achieved with an electrical discharge machining (EDM) procedure, but the process is time consuming processes (machined with a cutting tool, and electrical discharge machining, or EDM) and, therefore-defined sinusoidal and triangular gratings by wire EDM entails a post-machining polishing step. This process, which

Tan, Hong Z.

155

Experimental observation of a traveling plasma grating formed by two crossing filaments in gases  

SciTech Connect (OSTI)

The spatial motion and effective duration of a traveling plasma grating formed by two interfering femtosecond laser filaments in gases is characterized by its Doppler effect imparted on a probe pulse. The shift velocity determined experimentally agrees with the theoretical calculations.

Durand, Magali [Laboratoire d'Optique Appliquee, ENSTA ParisTech-Ecole Polytechnique-CNRS, 91761 Palaiseau (France); ONERA, Chemin de la Huniere, 91761 Palaiseau (France); Liu Yi; Forestier, Benjamin; Houard, Aurelien; Mysyrowicz, Andre [Laboratoire d'Optique Appliquee, ENSTA ParisTech-Ecole Polytechnique-CNRS, 91761 Palaiseau (France)

2011-03-21T23:59:59.000Z

156

Passive Spectroscopy Bolometers, Grating- And X-Ray Imaging Crystal Spectrometers  

SciTech Connect (OSTI)

This tutorial gives a brief introduction into passive spectroscopy and describes the working principles of bolometers, a high-resolution grating spectrometer, and a novel X-ray imaging crystal spectrometer, which is of particular interest for profile measurements of the ion temperature and plasma rotation velocity on ITER and future burning plasma experiments.

Bitter, M; Hill, K W; Scott, S; Paul, S; Ince-Cushmann, A; Reinke, M; Rice, J; Beiersdorfer, P; Gu, M F; Lee, S G; Broennimann, C; Eikenberry, E F

2007-11-07T23:59:59.000Z

157

Europhysics Letters PREPRINT Lipid membranes on a surface grating studied by neutron  

E-Print Network [OSTI]

Europhysics Letters PREPRINT Lipid membranes on a surface grating studied by neutron reflectometry by neutron reflectometry, we determine the smectic penetration length = K/B from the relative intensity 37073 Goettingen, Germany PACS. 87.16.Dg ­ Membranes, bilayers, and vesicles. PACS. 61.12.Ha ­ Neutron

Paris-Sud XI, Université de

158

COMPARISON OF CSS-CdTe AND PVD-CdTe WITH DIFFERENT ACTIVATION PROCESSES , G. Khrypunov2,4  

E-Print Network [OSTI]

University, Leicestershire, LE11 3TU, UK ABSTRACT: CdTe polycrystalline thin film solar cells have a strong AM1.5 illumination. Amongst several attractive features high chemical stability of CdTe and a simple simplification has been done by substituting the CdCl2 step by treating CdTe films in an atmosphere containing

Romeo, Alessandro

159

THE PERFORMANCE OF THIN FILM SOLAR CELLS EMPLOYING PHOTOVOLTAIC Cu22014x Te-CdTe HETEROJUNCTIONS (1)  

E-Print Network [OSTI]

195 THE PERFORMANCE OF THIN FILM SOLAR CELLS EMPLOYING PHOTOVOLTAIC Cu22014x Te This paper is a short status report on the continuing development of Cu22014xTe-CdTe thin film solar cells Company has had a conti- nuous effort on thin film solar cells for the past four and a half years

Paris-Sud XI, Université de

160

First-principles study of the electronic and structural properties of (CdTe)n/(ZnTe)n superlattices  

Science Journals Connector (OSTI)

Abstract We present the results of a first-principles study of the electronic and structural properties of binary CdTe and ZnTe compounds and their (CdTe)n/(ZnTe)n superlattices (SLs). The computational method is based on the full-potential linear muffin tin orbitals method (FP-LMTO) augmented by a plane-wave basis (PLW). The exchange and correlation energy is described in the local density approximation (LDA) using the PerdewWang parameterization including a generalized gradient approximation (GGA). The calculated structural properties of CdTe and ZnTe compounds are in good agreement with available experimental and theoretical data. We have also carried out band-structure calculations for the binary CdTe and ZnTe compounds and their (CdTe)n/(ZnTe)n superlattices (SLs). From the results of the electronic properties, we find that the parent material CdTe and ZnTe and their superlattices have a direct band gaps. The fundamental band gap decreases with increasing the number of monolayer n.

M. Boucharef; S. Benalia; D. Rached; M. Merabet; L. Djoudi; B. Abidri; N. Benkhettou

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

A Precision Comparison of Calculated and Observed Grating Constants of Crystals  

Science Journals Connector (OSTI)

A precision comparison of the calculated and observed grating constants of calcite, rocksalt, artificial KCl, and diamond crystals is made with calcite as standard. The calculated values are determined from density measurements, while the observed values are calculated from the angles of reflection for the Mo K?1 line obtained by means of a precision double-crystal spectrometer. The value of ? obtained from the calculated grating constant of calcite is used to determine the observed grating constants of the other crystals. The density of rocksalt and KCl is measured by immersion in Russian mineral oil whose density and change of density with temperature was found to be 0.88011 at 24C. and 0.000064 per 0.1 respectively. The density of diamond is determined by weighing a solution of thallous formate and thallous malonate, in which the diamond just floats, in a calibrated specific gravity bottle of approximately 50 cc capacity. Two methods are used in the x-ray measurements, namely, the calcite method, de scribed by A. H. Compton and S. K. Allison and J. H. Williams, and the rocksalt method. The latter consists of measuring the peak position of the beam reflected from crystal B by swinging the ionization chamber past the beam, with two narrow slits between it and the crystal, ranging in width from 0.04 to 0.08 mm and separated by a distance of 18 cm. Calculated and observed values of the grating constants of these crystals are found to agree within experimental error, ranging from 0.004 to 0.011 percent, showing no evidence of Zwicky's "secondary structure," which he offered as a possible explanation of the discrepancy between x-ray wave-lengths obtained by the crystal method and those by the ruled grating method. Measurements on two quartz crystals showed a decided variation in the internal structure of the crystal, and indicate that quartz is unsuitable for precise wave-length measurements.

Yuching Tu

1932-06-01T23:59:59.000Z

162

Effect of plasmonic losses on light emission enhancement in quantum-wells coupled to metallic gratings  

SciTech Connect (OSTI)

Recent experimental work has shown significant luminescence enhancement from near-surface quantum-well (QW) structures using metallic grating to convert surface plasmon (SP) modes into radiative modes. This work introduces a detailed theoretical study of plasmonic losses and the role of SPs in improving light extraction from grated light-emitting QW structures, using the fluctuational electrodynamics method. The method explains experimental results demonstrating emission enhancement, light scattering, and plasmonic coupling in the structures. We study these effects in angle-resolved reflectometry and luminescence setups in InGaN QW structures with silver grating. In contrast to experiments, our model allows direct calculation of the optical losses. The model predicts that the plasmonic coupling and scattering increases light emission by a factor of up to three compared to a flat semiconductor structure. This corresponds to reducing the absorption losses from approximately 93% in the ungrated metallic structure to 75% in the grated structure. Lower losses are associated with a significant emission enhancement enabled by the SPs of silver/GaN interfaces, which are present in the blue/green wavelength range, and can be optimized by carefully nanostructuring the metal layer and by the positioning of the QW. In general, the enhancement results from the interplay of mode scattering, conversion of SP energy directly into light, and losses in the metallic grating. The reported losses are very high when compared to the losses present in modern light-emitting diodes (LEDs). Albeit, our work provides tools needed for further optimization of plasmonic light extraction, eventually leading to highly efficient LEDs.

Sadi, Toufik; Oksanen, Jani; Tulkki, Jukka [Department of Biomedical Engineering and Computational Sciences, Aalto University, P.O. Box 12200, FI-00076 Aalto (Finland)

2013-12-14T23:59:59.000Z

163

Formation of binary phase gratings in photopolymer-liquid crystal composites by a surface-controlled anisotropic phase separation  

SciTech Connect (OSTI)

We report on formation of binary phase gratings in photopolymer-liquid crystal (PLC) composites using a surface-controlled phase separation method. The binary nature of the PLC phase gratings is produced by employing a single step photo-ablation through an amplitude photomask which precisely controls the interfacial interactions between the LC and the photopolymer on the alignment layer. A subsequent illumination of the ultraviolet light onto the whole PLC promotes an anisotropic phase separation resulting in the formation of distinct binary patterns for the PLC structure. The electrically tunable diffraction properties of the binary phase gratings are presented.

Park, Jae-Hong; Khoo, Iam Choon; Yu, Chang-Jae; Jung, Min-Sik; Lee, Sin-Doo [216 Electrical Engineering East, Pennsylvania State University, University Park, Pennsylvania 16802 (United States); School of Electrical Engineering no. 32, Seoul National University, Kwanak P.O. Box 34, Seoul 151-600 (Korea, Republic of)

2005-01-10T23:59:59.000Z

164

Milestones and basic principles of grating-based x-ray and neutron phase-contrast imaging  

SciTech Connect (OSTI)

This is a review of the most important milestones in the last ten years of development in the field of grating-based x-ray and neutron imaging. It provides a description of the basic imaging principles of grating-based phase-contrast and dark-field radiography and present some exemplary multimodal radiography results obtained with x-rays and neutrons. Furthermore, it reviews the theory of grating-based quantitative transmission, phase-contrast, and dark-field scattering computed tomography.

Pfeiffer, Franz [Technical University Munich, 85748 Garching (Germany)

2012-07-31T23:59:59.000Z

165

Luminescence Enhancement of CdTe Nanostructures in LaF3:Ce/CdTe Nanocomposites  

SciTech Connect (OSTI)

Radiation detection demands new scintillators with high quantum efficiency, high energy resolution and short luminescence lifetimes. Nanocomposites consisting of quantum dots and Ce3+ doped nanophosphors may be able to meet these requirements. Here we report the luminescence of LaF3:Ce/CdTe nanocomposites which were synthesized by a wet chemistry method. In LaF3:Ce/CdTe nanocomposites the CdTe quantum dots are converted into nanowires, while in LaF3/CdTe nanocomposites no such conversion is observed. The CdTe luminescence in LaF3:Ce/CdTe nanocomposites is enhanced about 5 times, while in LaF3/CdTe nanocomposites no enhancement was observed. Energy transfer, light-re-absorption and surface passivation are likely the reasons for the luminescence enhancement.

Yao, Mingzhen; Zhang, Xing; Ma, Lun; Chen, Wei; Joly, Alan G.; Huang, Jinsong; Wang, Qingwu

2010-11-15T23:59:59.000Z

166

New chalcogenide glasses in the CdTe-AgI-As{sub 2}Te{sub 3} system  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer Determination of the glass-forming region in the pseudo-ternary CdTe-AgI-As{sub 2}Te{sub 3} system. Black-Right-Pointing-Pointer Characterization of macroscopic properties of the new CdTe-AgI-As{sub 2}Te{sub 3} glasses. Black-Right-Pointing-Pointer Characterization of the total conductivity of CdTe-AgI-As{sub 2}Te{sub 3} glasses. Black-Right-Pointing-Pointer Comparison between the selenide and telluride equivalent systems. -- Abstract: Chalcogenide glasses in the pseudo-ternary CdTe-AgI-As{sub 2}Te{sub 3} system were synthesized and the glass-forming range was determined. The maximum content of CdTe in this glass system was found to be equal to 15 mol.%. The macroscopic characterizations of samples have consisted in Differential Scanning Calorimetry, density, and X-ray diffraction measurements. The cadmium telluride addition does not generate any significant change in the glass transition temperature but the resistance of binary AgI-As{sub 2}Te{sub 3} glasses towards crystallisation is estimated to be decreasing on the base of {Delta}T = T{sub x} - T{sub g} parameter. The total electrical conductivity {sigma} was measured by complex impedance spectroscopy. First, the CdTe additions in the (AgI){sub 0.5}(As{sub 2}Te{sub 3}){sub 0.5} host glass, (CdTe){sub x}(AgI){sub 0.5-x/2}(As{sub 2}Te{sub 3}){sub 0.5-x/2} lead to a conductivity decrease at x {<=} 0.05. Then, the behaviour is reversed at 0.05 {<=} x {<=} 0.15. The obtained results are discussed by comparison with the equivalent selenide system.

Kassem, M. [Univ. Picardie Jules Verne, F-80000 Amiens (France)] [Univ. Picardie Jules Verne, F-80000 Amiens (France); Le Coq, D., E-mail: david.lecoq@univ-littoral.fr [Univ. Lille Nord de France, F-59000 Lille (France); ULCO, LPCA, EA 4493, F-59140 Dunkerque (France); Boidin, R.; Bychkov, E. [Univ. Lille Nord de France, F-59000 Lille (France) [Univ. Lille Nord de France, F-59000 Lille (France); ULCO, LPCA, EA 4493, F-59140 Dunkerque (France)

2012-02-15T23:59:59.000Z

167

Relations between structural parameters and physical properties in CdTe and Cd0.96Zn0.04Te alloys  

E-Print Network [OSTI]

481 Relations between structural parameters and physical properties in CdTe and Cd0.96Zn0.04Te cristaux de CdTe et de Cd0,96Zn0,04Te, de densité de dislocations variant entre 5 x 104 et 6 x 105 cm-2. La and photoluminescence experiments were performed on several CdTe and Cd0.96Zn0.04Te crystals with dislocation density

Paris-Sud XI, Université de

168

An ethanol vapor detection probe based on a ZnO nanorod coated optical fiber long period grating  

Science Journals Connector (OSTI)

A new ethanol vapor detection probe based on an optical fiber long period grating overlaid with a zinc oxide (ZnO) nanorods layer is presented. The ZnO nanorod layer was developed onto...

Konstantaki, Maria; Klini, Argyro; Anglos, Demetrios; Pissadakis, Stavros

2012-01-01T23:59:59.000Z

169

Annealing of UV Ar+ and ArF excimer laser fabricated Bragg gratings: SMF-28e fiber  

Science Journals Connector (OSTI)

Fiber Bragg gratings fabricated in pristine SMF-28e fibers using pulsed ArF-excimer and cw 244-nm Ar+ laser were annealed using tempering rates from 0.0038 to 0.25 K/s....

Violakis, Georgios; Limberger, Hans G

2014-01-01T23:59:59.000Z

170

Fabrication of high-throughput critical-angle X-ray transmission gratings for wavelength-dispersive spectroscopy  

E-Print Network [OSTI]

The development of the critical-angle transmission (CAT) grating seeks both an order of magnitude improvement in the effective area, and a factor of three increase in the resolving power of future space-based, soft x-ray ...

Bruccoleri, Alexander Robert

2013-01-01T23:59:59.000Z

171

Optimization of nonbinary slanted surface-relief gratings as high-efficiency broadband couplers for light guides  

Science Journals Connector (OSTI)

We propose and investigate the use of slanted surface-relief gratings with nonbinary profiles as high-efficiency broadband couplers for light guides. First, a Chandezon-method-based...

Bai, Benfeng; Laukkanen, Janne; Kuittinen, Markku; Siitonen, Samuli

2010-01-01T23:59:59.000Z

172

Detection of adulteration in virgin olive oil using a fiber optic long period grating based sensor  

Science Journals Connector (OSTI)

A fiber optic sensing system for the detection of adulteration of virgin olive oil by less expensive sunflower oil is presented. The fundamental principle of detection is the sensitive dependence of the resonance peaks of a long period grating (LPG) on the changes in the refractive index of the environmental medium surrounding the cladding surface of the grating. The performance of the sensor has been tested by monitoring the amplitude changes of the attenuation bands of the LPG in response to variation of adulteration level. With good repeatability, the detection limit of adulteration is 4% and the sensor sensitivity is around 0.07dBvol%?1 of adulterant in the measurement range. The developed sensor is user-friendly, reusable and allows instantaneous measurement of the amount of adulteration without involving any reagents.

T M Libish; M C Bobby; J Linesh; S Mathew; C Pradeep; V P N Nampoori; P Biswas; S Bandyopadhyay; K Dasgupta; P Radhakrishnan

2013-01-01T23:59:59.000Z

173

Cascading metallic gratings for broadband absorption enhancement in ultrathin plasmonic solar cells  

SciTech Connect (OSTI)

The incorporation of plasmonic nanostructures in the thin-film solar cells (TFSCs) is a promising route to harvest light into the nanoscale active layer. However, the light trapping scheme based on the plasmonic effects intrinsically presents narrow-band resonant enhancement of light absorption. Here we demonstrate that by cascading metal nanogratings with different sizes atop the TFSCs, broadband absorption enhancement can be realized by simultaneously exciting multiple localized surface plasmon resonances and inducing strong coupling between the plasmonic modes and photonic modes. As a proof of concept, we demonstrate of 66.5% in the photocurrent in an ultrathin amorphous silicon TFSC with two-dimensional cascaded gratings over the reference cell without gratings.

Wen, Long; Sun, Fuhe [Key Laboratory of Nanodevices and Applications-CAS and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123 (China); Chen, Qin, E-mail: qchen2012@sinano.ac.cn [Key Laboratory of Nanodevices and Applications-CAS and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123 (China); Peking University Shenzhen SOC Key Laboratory, PKU-HKUST Shenzhen-Hong Kong Institute, Hi-Tech Industrial Park South, Shenzhen 518057 (China)

2014-04-14T23:59:59.000Z

174

Grating formation by a high power radio wave in near-equator ionosphere  

SciTech Connect (OSTI)

The formation of a volume grating in the near-equator regions of ionosphere due to a high power radio wave is investigated. The radio wave, launched from a ground based transmitter, forms a standing wave pattern below the critical layer, heating the electrons in a space periodic manner. The thermal conduction along the magnetic lines of force inhibits the rise in electron temperature, limiting the efficacy of heating to within a latitude of few degrees around the equator. The space periodic electron partial pressure leads to ambipolar diffusion creating a space periodic density ripple with wave vector along the vertical. Such a volume grating is effective to cause strong reflection of radio waves at a frequency one order of magnitude higher than the maximum plasma frequency in the ionosphere. Linearly mode converted plasma wave could scatter even higher frequency radio waves.

Singh, Rohtash; Sharma, A. K.; Tripathi, V. K. [Department of Physics, Indian Institute of Technology Delhi, New Delhi-110016 (India)

2011-11-15T23:59:59.000Z

175

Reverse Doppler effect of magnons with negative group velocity scattered from a moving Bragg grating  

Science Journals Connector (OSTI)

We demonstrate experimentally and theoretically the reverse Doppler effect when magnons with negative group velocity are reflected off a moving Bragg grating. This grating, which represents a moving magnonic crystal, is created in an yttrium-iron-garnet film by the periodic strain induced by a traveling surface acoustic wave. As reflection occurs from a crystal rather than from a single reflecting surface, the wave number of the scattered wave is strictly determined by a momentum conservation law. Magnons scattered from the approaching (receding) magnonic crystal are found to be shifted down (up) in frequency. This result, together with an earlier report of reverse Doppler shift from moving sources [D. D. Stancil et al., Phys. Rev. B, 74, 060404(R) (2006)], establishes that the reverse Doppler effect is a universal phenomenon in systems with negative group velocity and not restricted to left-handed materials.

A. V. Chumak; P. Dhagat; A. Jander; A. A. Serga; B. Hillebrands

2010-04-16T23:59:59.000Z

176

Surface shape resonances and surface plasmon polariton excitations in bottle-shaped metallic gratings  

Science Journals Connector (OSTI)

We study surface plasmon polariton excitations and surface shape resonances in a lossy metallic grating with bivalued cavities. The modal formalism is used to solve the diffraction problem for the infinite grating and the homogeneous problem for a single cavity in a plane surface. Both polarization modes are considered. We provide curves of reflected efficiency versus wavelength as well as near-field plots. The resonances are identified as dips in the reflected efficiency, which imply significant power absorptions. Results for various depths of the cavities and for several angles of incidence are shown, where the different types of resonant behavior can be appreciated. Particular attention is paid to the changes introduced by the finite conductivity of the metal in relation to the results obtained for a perfect conductor.

Diana C. Skigin and Ricardo A. Depine

2001-03-27T23:59:59.000Z

177

An experimental study of low-frequency amplitude noise in a fibre Bragg grating laser diode  

SciTech Connect (OSTI)

We have studied the amplitude noise in a fibre Bragg grating laser diode. It has been shown that discontinuities in noise characteristics correlate with those in the power current and spectral characteristics of the laser diode, whereas the noise characteristics of the pump source have no such discontinuities. The highest noise level has been observed at pump currents corresponding to concurrent generation of two longitudinal modes. (lasers)

Zholnerov, V S [Russian Institute of Radionavigation and Time, St.Petersburg (Russian Federation); Ivanov, A V; Kurnosov, V D; Kurnosov, K V; Romantsevich, V I; Chernov, R V [Open Joint-Stock Company M.F. Stel'makh Polyus Research Institute, Moscow (Russian Federation)

2013-09-30T23:59:59.000Z

178

Ytterbium-doped fibre laser with a Bragg grating reflector written in a multimode fibre  

SciTech Connect (OSTI)

An efficient cladding-pumped Yb-doped fibre laser with a Bragg grating written in a multimode graded-index fibre is fabricated for the first time. The laser emits one transverse mode with a slope efficiency of 60%. The resonator design proposed in the paper can be used for the development of high-power fibre lasers with an increased fibre core diameter. (lasers)

Kurkov, Andrei S; Grukh, Dmitrii A; Medvedkov, O I; Paramonov, Vladimir M; Dianov, Evgenii M [Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation)

2005-04-30T23:59:59.000Z

179

Modeling On-Grate MSW Incineration with Experimental Validation in a Batch Incinerator  

Science Journals Connector (OSTI)

This knowledge cannot be readily obtained from direct experimental studies on industrial-scale incinerators; in contrast, mathematical modeling and numerical simulation appear to be an attractive approach for quantitative insight into the mechanisms and variables of waste-bed incineration. ... This approach was successfully employed for grate(6) or rotary kiln(7) plants. ... Gasification of carbon (char or coke) by steam is a well-known process for producing syngas. ...

Abhishek Asthana; Yannick Me?nard; Philippe Sessiecq; Fabrice Patisson

2010-07-12T23:59:59.000Z

180

Characterization of CdZnTe ambient temperature detectors  

SciTech Connect (OSTI)

A great deal of interest has been generated in the use of cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe) detectors for ambient temperature detection of radionuclides. The addition of zinc to CdTe provides several benefits that enhance the materials operational characteristics at ambient temperature. Recent movement in the industry is to produce larger volume detectors using CdZnTe without much known about the effects of larger geometry on performance. The purpose of this study is to get an idea of the relationship of detector performance to both area and thickness variations.

Lavietes, A.

1994-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

High Performance Zintl Phase TE Materials with Embedded Particles...  

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

TE Materials with Embedded Particles Presents results from embedding nanoparticles in magnesium silicide alloy matrix reducing thermal conductivity by phonon scattering and...

182

A Search for Neutrinoless Double Beta Decay of Te-130.  

E-Print Network [OSTI]

??This dissertation describes an experimental search for neutrinoless double beta (0???) decay of 130Te. An observation of 0??? decay would establish that neutrinos are Majorana (more)

Bryant, Adam Douglas

2010-01-01T23:59:59.000Z

183

Effect of Manganese Concentration in the Cd1-xMnxTe/CdTe Tandem Structure on Photovoltaic Energy Conversion  

Science Journals Connector (OSTI)

Abstract The photovoltaic electricity is obtained by direct conversion of sunlight into electricity by solar cells. The objective of this work is the study and simulation of a Tandem photovoltaic structure based on Cd1-xMnxTe as top material cell. This paper describes the optimization of energy efficiency for Cd1-xMnxTe thin films deposited by epitaxy on CdTe substrat. We present the impact of the manganese concentration in Cd1-xMnxTe thin films on solar cells performances. Our study includes simulation results to show the conversion efficiency and main performances factors as function of the manganese concentration.

A. Aissat; M. El Bey; M. Fathi; J.P. Vilcot

2013-01-01T23:59:59.000Z

184

Atomistic simulation of CdTe solid-liquid coexistence equilibria...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

simulation of CdTe solid-liquid coexistence equilibria. Atomistic simulation of CdTe solid-liquid coexistence equilibria. Abstract: Atomistic simulations of CdTe using a...

185

Strain relaxation of CdTe films growing on lattice-mismatched substrates  

E-Print Network [OSTI]

gap approaches the value of bulk CdTe crystals. This makesbulk crystals with crystalline CdTe ?lms for the purpose ofthe top layer of thick CdTe ?lms grown on Si(001) substrate

Ma, Zhixun; Yu, Kin Man; Walukiewicz, Wladek; Yu, Peter Y.; Mao, Samuel S.

2009-01-01T23:59:59.000Z

186

Mechanical and Electrical Properties of CdTe Tetrapods Studied by Atomic Force Microscopy  

E-Print Network [OSTI]

Electrical Properties of CdTe Tetrapods Studied by Atomicelectrical properties of CdTe tetrapod-shaped nanocrystalsIntroduction CdSe and CdTe nanocrystals possess interesting

2008-01-01T23:59:59.000Z

187

E-Print Network 3.0 - amorphous ge-sb-te films Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

times in GeSbTe films irradiated... commercial phase-change optical recording systems, such as those based on GeSbTe Ref. 3 or AglnSbTe,4 use... the crystalline and...

188

Raman Microscopy and Mapping as a Probe for Photodegradation in Surface Relief Gratings Recorded on Layer-by-Layer Films of Congo Red/Polyelectrolyte  

Science Journals Connector (OSTI)

Raman microscopy, mapping, and surface-enhanced Raman scattering techniques have been applied to investigate the degradation of Congo Red (CR) in a surface relief grating (SRG)...

Constantino, C J L; Aroca, R F; He, J -A; Zucolotto, V; Li, L; Oliveira, O N; Kumar, J; Tripathy, S K

2002-01-01T23:59:59.000Z

189

Interfacial Reaction Between Nb Foil and n-Type PbTe Thermoelectric Materials During Thermoelectric Contact Fabrication  

Science Journals Connector (OSTI)

PbTe is a high-conversion-efficiency thermoelectric (TE) material that is commonly used in space exploration applications. Integration of PbTe in TE devices has a significant impact on the conversion efficienc...

Haiyang Xia; Cheng-Lung Chen; Fivos Drymiotis; Aiping Wu

2014-11-01T23:59:59.000Z

190

CdS/CdTe Solar Cells Containing Directly-Deposited CdSxTe1-x Alloy Layers  

SciTech Connect (OSTI)

A CdS{sub x}Te{sub 1-x} layer forms by interdiffusion of CdS and CdTe during the fabrication of thin-film CdTe photovoltaic (PV) devices. The CdS{sub x}Te{sub 1-x} layer is thought to be important because it relieves strain at the CdS/CdTe interface that would otherwise exist due to the 10% lattice mismatch between these two materials. Our previous work [1] has indicated that the electrical junction is located in this interdiffused CdS{sub x}Te{sub 1-x} region. Further understanding, however, is essential to predict the role of this CdS{sub x}Te{sub 1-x} layer in the operation of CdS/CdTe devices. In this study, CdS{sub x}Te{sub 1-x} alloy films were deposited by radio-frequency (RF) magnetron sputtering and co-evaporation from CdTe and CdS sources. Both RF-magnetron-sputtered and co-evaporated CdS{sub x}Te{sub 1-x} films of lower S content (x<;0.3) have a cubic zincblende (ZB) structure akin to CdTe, whereas those of higher S content have a hexagonal wurtzite (WZ) structure like that of CdS. Films become less preferentially oriented as a result of a CdCl{sub 2} heat treatment (HT) at {approx}400 C for 5 min. Films sputtered in a 1% O{sub 2}/Ar ambient are amorphous as deposited, but show CdTe ZB, CdS WZ, and CdTe oxide phases after a CdCl{sub 2} HT. Films sputtered in O{sub 2} partial pressure have a much wider bandgap than expected. This may be explained by nanocrystalline size effects seen previously [2] for sputtered oxygenated CdS (CdS:O) films. Initial PV device results show that the introduction of a directly-deposited CdS{sub x}Te{sub 1-x} alloy layer into the device structure produces devices of comparable performance to those without the alloy layer when a CdCl{sub 2} HT is performed. Further investigation is required to determine whether the CdCl{sub 2} heat treatment step can be altered or eliminated through direct deposition of the alloy layer.

Duenow, J. N.; Dhere, R. G.; Moutinho, H. R.; To, B.; Pankow, J. W.; Kuciauskas, D.; Gessert, T. A.

2011-01-01T23:59:59.000Z

191

NONLINEAR OPTICAL EFFECTS IN ROTATIONALLY-TWINNED CRYSTALS: AN EVALUATION OF CdTe, ZnTe AND ZnSe  

E-Print Network [OSTI]

405 NONLINEAR OPTICAL EFFECTS IN ROTATIONALLY-TWINNED CRYSTALS: AN EVALUATION OF CdTe, ZnTe AND Zn une loi en N2. On discutera les avantages potentiels en optique non linéaire des cristaux de CdTe, Zn-spaced twin planes the enhancement is proportional to N2. A comparison is made between CdTe, ZnTe, and Zn

Boyer, Edmond

192

TE Link Dormant Mode Used in GMPLS Optical Transport Networks for Energy Saving  

Science Journals Connector (OSTI)

This paper evaluates power efficiency of TE link dormant mode in optical transport network, considering daily traffic variability and GMPLS protocol. The proposed TE link dormant mode...

Li, Xin; Huang, Shanguo; Guo, Bingli; Zhang, Jie; Gu, Wanyi

193

Numerical and theoretical study of the generation of extreme ultraviolet radiation by relativistic laser interaction with a grating  

SciTech Connect (OSTI)

The generation of harmonics by the interaction of a femtosecond, relativistic intensity laser pulse with a grating of subwavelength periodicity was studied numerically and theoretically. For normal incidence, strong, coherent emission at the wavelength of the grating period and its harmonics is obtained, nearly parallel to the target surface, due to relativistic electron bunches emanating from each protuberance. For oblique incidence (30 deg.), only even harmonics of the grating periodicity are seen, but with an even higher intensity. This is due to constructive interference of the emission from the grating protuberances. The emission along the grating surface is composed of trains of attosecond pulses; therefore there is no need to use a filter. An efficiency greater than 10{sup -4} is obtained for the 24th harmonic. The conversion efficiency is fairly constant when the similarity parameter S=n{sub e}/(a{sub 0}n{sub c})({proportional_to}n{sub e{lambda}L}/I{sub L}{sup 1/2}) is held fixed, and is optimum when S{approx_equal}4. Here, n{sub e} and n{sub c} are the electron density and the critical density; a{sub 0}=eE{sub L}/(m{sub e{omega}L}c) is the quiver momentum in the laser field E{sub L} normalized to m{sub e}c.

Lavocat-Dubuis, X.; Matte, J.-P. [INRS-Energie, Materiaux et Telecommunications, Varennes, Quebec J3X 1S2 (Canada)

2010-09-15T23:59:59.000Z

194

Laser irradiation effects on the CdTe/ZnTe quantum dot structure studied by Raman and AFM spectroscopy  

SciTech Connect (OSTI)

Micro-Raman spectroscopy has been applied to investigate the impact of laser irradiation on semiconducting CdTe/ZnTe quantum dots (QDs) structures. A reference sample (without dots) was also studied for comparison. Both samples were grown by molecular beam epitaxy technique on the p-type GaAs substrate. The Raman spectra have been recorded for different time of a laser exposure and for various laser powers. The spectra for both samples exhibit peak related to the localized longitudinal (LO) ZnTe phonon of a wavenumber equal to 210 cm{sup -1}. For the QD sample, a broad band corresponding to the LO CdTe phonon related to the QD-layer appears at a wavenumber of 160 cm{sup -1}. With increasing time of a laser beam exposure and laser power, the spectra get dominated by tellurium-related peaks appearing at wavenumbers around 120 cm{sup -1} and 140 cm{sup -1}. Simultaneously, the ZnTe surface undergoes rising damage, with the formation of Te aggregates at the pinhole edge as reveal atomic force microscopy observations. Local temperature of irradiated region has been estimated from the anti-Stokes/Stokes ratio of the Te modes intensity and it was found to be close or exceeding ZnTe melting point. Thus, the laser damage can be explained by the ablation process.

Zielony, E.; Placzek-Popko, E.; Henrykowski, A.; Gumienny, Z.; Kamyczek, P.; Jacak, J. [Institute of Physics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw (Poland); Nowakowski, P.; Karczewski, G. [Institute of Physics, Polish Academy of Sciences, al. Lotnikow 32/46, 02-668 Warsaw (Poland)

2012-09-15T23:59:59.000Z

195

Use of separate ZnTe interface layers to form ohmic contacts to p-CdTe films  

DOE Patents [OSTI]

A method of is disclosed improving electrical contact to a thin film of a p-type tellurium-containing II-VI semiconductor comprising: depositing a first undoped layer of ZnTe on a thin film of p-type tellurium containing II-VI semiconductor with material properties selected to limit the formation of potential barriers at the interface between the p-CdTe and the undoped layer, to a thickness sufficient to control diffusion of the metallic-doped ZnTe into the p-type tellurium-containing II-VI semiconductor, but thin enough to minimize affects of series resistance; depositing a second heavy doped p-type ZnTe layer to the first layer using an appropriate dopant; and depositing an appropriate metal onto the outer-most surface of the doped ZnTe layer for connecting an external electrical conductor to an ohmic contact. 11 figs.

Gessert, T.A.

1999-06-01T23:59:59.000Z

196

Use of separate ZnTe interface layers to form OHMIC contacts to p-CdTe films  

DOE Patents [OSTI]

A method of improving electrical contact to a thin film of a p-type tellurium-containing II-VI semiconductor comprising: depositing a first undoped layer of ZnTe on a thin film of p-type tellurium containing II-VI semiconductor with material properties selected to limit the formation of potential barriers at the interface between the p-CdTe and the undoped layer, to a thickness sufficient to control diffusion of the metallic-doped ZnTe into the p-type tellurim-containing II-VI semiconductor, but thin enough to minimize affects of series resistance; depositing a second heavy doped p-type ZnTe layer to the first layer using an appropriate dopant; and depositing an appropriate metal onto the outer-most surface of the doped ZnTe layer for connecting an external electrical conductor to an ohmic contact.

Gessert, Timothy A. (Conifer, CO)

1999-01-01T23:59:59.000Z

197

Properties of the cladding modes of an optical fibre excited by refractive-index gratings  

SciTech Connect (OSTI)

The properties of the cladding modes of an optical fibre, excited by photoinduced long-period fibre gratings, were investigated by the near- and far-field methods. It is shown that the cladding modes considered are of the HE{sub 1m} type. A satisfactory agreement between the experimental and calculated distributions of the electromagnetic field of the modes is demonstrated. It was found that the propagation length of a cladding mode in the unperturbed fibre reaches 1 m. (laser applications and other topics in quantum electronics)

Vasil'ev, Sergei A; Dianov, Evgenii M; Medvedkov, O I; Protopopov, V N [Fiber Optics Research Center, Russian Academy of Sciences, Moscow (Russian Federation); Costantini, D M; Iocco, A; Limberger, H G; Salathe, R-P [Institute of Applied Optics, Swiss Federal Institute of Technology, Lausanne (Switzerland)

1999-01-31T23:59:59.000Z

198

Combustion process in a biomass grate fired industry furnace: a CFD study  

Science Journals Connector (OSTI)

This paper presents a CFD investigation of the combustion process in a 50 MW grate fired furnace. The CFD results were compared with available experimental data at the furnace outlet to validate the models for the volatile oxidation and NOx formation. The models were then used to predict the effect of an 'ECO' tube system on NOx emissions. It was shown that with an improved flow structure and air distribution, 30% NOx reduction can be obtained. CFD results revealed the impact of load and fuel moisture on the flow structure, the temperature distribution and the flow residence time.

T. Klason; X.S. Bai

2006-01-01T23:59:59.000Z

199

Real-time observation of nanoscale topological transitions in epitaxial PbTe/CdTe heterostructures  

SciTech Connect (OSTI)

The almost completely immiscible PbTe/CdTe heterostructure has recently become a prototype system for self-organized quantum dot formation based on solid-state phase separation. Here, we study by real-time transmission electron microscopy the topological transformations of two-dimensional PbTe-epilayers into, first, a quasi-one-dimensional percolation network and subsequently into zero-dimensional quantum dots. Finally, the dot size distribution coarsens by Ostwald ripening. The whole transformation sequence occurs during all stages in the fully coherent solid state by bulk diffusion. A model based on the numerical solution of the Cahn-Hilliard equation reproduces all relevant morphological and dynamic aspects of the experiments, demonstrating that this standard continuum approach applies to coherent solids down to nanometer dimensions. As the Cahn-Hilliard equation does not depend on atomistic details, the observed morphological transformations are general features of the model. To confirm the topological nature of the observed shape transitions, we developed a parameter-free geometric model. This, together with the Cahn-Hilliard approach, is in qualitative agreement with the experiments.

Groiss, H., E-mail: heiko.groiss@jku.at, E-mail: istvan.daruka@jku.at; Daruka, I., E-mail: heiko.groiss@jku.at, E-mail: istvan.daruka@jku.at; Springholz, G.; Schffler, F. [Institute of Semiconductor and Solid State Physics, Johannes Kepler University, Linz 4040 (Austria); Koike, K.; Yano, M. [Nanomaterials Microdevices Research Center, Osaka Institute of Technology, Asahi-ku Ohmiya, Osaka 535-8585 (Japan); Hesser, G. [Center for Surface- and Nanoanalytics (ZONA), Johannes Kepler University, Linz 4040 (Austria); Zakharov, N.; Werner, P. [Max Planck Institute of Microstructure Physics, Halle 06120 (Germany)

2014-01-01T23:59:59.000Z

200

Long-period fiber grating as wavelength selective element in double-clad Yb-doped fiber-ring lasers  

E-Print Network [OSTI]

Selection of operating wavelength of the Yb-doped fiber-ring lasers using longperiod fiber gratings (LPFGs) is suggested. In the proposed method, customized LPFG that sustains high powers serves as a broad-band rejection filter. It modifies the net gain profile of the laser, enabling the peak gain to occur at a designed wavelength. Spectral range of oscillation between 1050-1110 nm was experimentally demonstrated. This range can be extended to both shorter and longer wavelengths with proper design of the LPFG and length of the Yb-doped fiber. The gratings were inscribed by CO2 laser and the grating period down to 175 ?m was achieved being, to our best knowledge, the shortest reported LPFG period using this technique.

Peterka, P; Dussardier, Bernard; Slavik, R; Honzatko, P; Kubecek, V

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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.


201

Simultaneous maximum-likelihood reconstruction for x-ray grating based phase-contrast tomography avoiding intermediate phase retrieval  

E-Print Network [OSTI]

Phase-wrapping artifacts, statistical image noise and the need for a minimum amount of phase steps per projection limit the practicability of x-ray grating based phase-contrast tomography, when using filtered back projection reconstruction. For conventional x-ray computed tomography, the use of statistical iterative reconstruction algorithms has successfully reduced artifacts and statistical issues. In this work, an iterative reconstruction method for grating based phase-contrast tomography is presented. The method avoids the intermediate retrieval of absorption, differential phase and dark field projections. It directly reconstructs tomographic cross sections from phase stepping projections by the use of a forward projecting imaging model and an appropriate likelihood function. The likelihood function is then maximized with an iterative algorithm. The presented method is tested with tomographic data obtained through a wave field simulation of grating based phase-contrast tomography. The reconstruction result...

Ritter, Andr; Durst, Jrgen; Gdel, Karl; Haas, Wilhelm; Michel, Thilo; Rieger, Jens; Weber, Thomas; Wucherer, Lukas; Anton, Gisela

2013-01-01T23:59:59.000Z

202

FROM THE ANAlyST'S COUCH Trends in the globalization  

E-Print Network [OSTI]

, including clinical-trial capacity (the average number of sites per trial); trial density per population regions (Eastern Europe, Latin America, Asia, Middle East and Africa) are mostly small players when

Sinskey, Anthony J.

203

Process Development for High Voc CdTe Solar Cells  

SciTech Connect (OSTI)

This is a cumulative and final report for Phases I, II and III of this NREL funded project (subcontract # XXL-5-44205-10). The main research activities of this project focused on the open-circuit voltage of the CdTe thin film solar cells. Although, thin film CdTe continues to be one of the leading materials for large-scale cost-effective production of photovoltaics, the efficiency of the CdTe solar cells have been stagnant for the last few years. This report describes and summarizes the results for this 3-year research project.

Ferekides, C. S.; Morel, D. L.

2011-05-01T23:59:59.000Z

204

Large birefringence and polarization holographic gratings formed in photocross-linkable polymer liquid crystals comprising bistolane mesogenic side groups  

SciTech Connect (OSTI)

Polarization gratings with large birefringence are formed in photoreactive polymer liquid crystals with bistolane moiety and terminal cinnamic acid moiety by the use of polarized ultraviolet interference light and subsequent annealing. The polarized ultraviolet light causes the axis-selective photoreaction between the cinnamic acid groups and subsequent annealing induce the reorientation of peripheral molecules without cross-linking along the cross-linked groups. Long bistolane mesogenic moiety exhibits large birefringence in comparison with a biphenyl mesogenic moiety, the value of the induced birefringence in the bistolane mesogenic liquid crystalline (LC) polymer is strongly dependent on both the grating constant and the wavelength of the reconstruction light.

Emoto, Akira; Matsumoto, Taro; Shioda, Tatsutoshi; Ono, Hiroshi [Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 (Japan); Yamashita, Ayumi; Kawatsuki, Nobuhiro [Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2201 (Japan)

2009-10-01T23:59:59.000Z

205

Optical properties of wide single-mode strip and grating loaded channel waveguides  

SciTech Connect (OSTI)

New wide single-mode strip and grating loaded (SGL) channel waveguides made of silicon nitride on the oxide buffer layer of a planar silicon-on-insulator waveguide are studied. The central 10-lm-wide strip produces a multi-mode channel waveguide and diffraction gratings with a period 0.6 lm built on the structure edges produce mode-dependent additional losses due to radiation to the surrounding medium. The optical properties of these waveguides are discussed using the results of a three-dimensional numerical simulation by the FDTD and BPM methods. It is shown that a wide SGL waveguide is quasi-single-mode one because it has a small propagation loss ({approx} 0.3 dB cm{sup -1}) for the fundamental mode and a high (up to -20 dB cm{sup -1}) loss for the higher order modes. The new SGL waveguides are CMOS compatible and can become basic for fabricating new photonic elements, including tunable optical filters and multi-plexers based on the multireflector technology. (waveguides)

Tsarev, Andrei V [Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk (Russian Federation)

2009-12-31T23:59:59.000Z

206

Linear diffraction grating interferometer with high alignment tolerance and high accuracy  

SciTech Connect (OSTI)

We present an innovative structure of a linear diffraction grating interferometer as a long stroke and nanometer resolution displacement sensor for any linear stage. The principle of this diffractive interferometer is based on the phase information encoded by the {+-}1st order beams diffracted by a holographic grating. Properly interfering these two beams leads to modulation similar to a Doppler frequency shift that can be translated to displacement measurements via phase decoding. A self-compensation structure is developed to improve the alignment tolerance. LightTool analysis shows that this new structure is completely immune to alignment errors of offset, standoff, yaw, and roll. The tolerance of the pitch is also acceptable for most installation conditions. In order to compact the structure and improve the signal quality, a new optical bonding technology by mechanical fixture is presented so that the miniature optics can be permanently bonded together without an air gap in between. For the output waveform signals, a software module is developed for fast real-time pulse counting and phase subdivision. A laser interferometer HP5529A is employed to test the repeatability of the whole system. Experimental data show that within 15 mm travel length, the repeatability is within 15 nm.

Cheng Fang; Fan, Kuang-Chao

2011-08-01T23:59:59.000Z

207

physica status solidi, 19 June 2012 Amorphous structures of Ge/Sb/Te  

E-Print Network [OSTI]

physica status solidi, 19 June 2012 Amorphous structures of Ge/Sb/Te alloys: Density functional functional simulations, Ge/Sb/Te alloys. Corresponding author: e-mail r.jones@fz-juelich.de, Phone: +49 discussed the alloy As30Ge10Si12Te48, and Te-based alloys have been well represented ever since. Alloys

208

Paul Sellin, Radiation Imaging Group The role of defects on CdTe detector performance  

E-Print Network [OSTI]

Paul Sellin, Radiation Imaging Group The role of defects on CdTe detector performance P.J. Sellin1-destructive material characterisation techniques have been applied to CdTe wafers grown by the Travelling Heater Method Imaging Group PL mapping of whole CdTe wafers PL ( =819 nm) scan for two CdTe wafers, (left: wafer L700

Sellin, Paul

209

Self-Assembly of CdTe Tetrapods into Network Monolayers at the Air/Water  

E-Print Network [OSTI]

Self-Assembly of CdTe Tetrapods into Network Monolayers at the Air/Water Interface Matthew D present a versatile method for cadmium telluride (CdTe) tetrapod syn- thesis by utilizing multiple Te the tetrapod shape. CdTe tetra- pods are a promising inorganic semicon- ductor for photovoltaic cells due

Lin, Zhiqun

210

Energy measurement of muons above 1 TeV  

Science Journals Connector (OSTI)

Pair production and bremsstrahlung cross-sections have sufficient magnitude and energy-dependence for muons above 1 TeV to suggest the use of these cross-sections for measurement of muon energies. A series of Mon...

M. K. Moe

1970-03-11T23:59:59.000Z

211

Selective Area Epitaxy of CdTe on Nanopatterned Substrates.  

E-Print Network [OSTI]

?? HgCdTe/Si devices can potentially be significantly improved by the use of nanopatterned substrate structures on Si to control point and extended crystal defects. This (more)

Fahey, Stephen

2013-01-01T23:59:59.000Z

212

Selective Area Epitaxy of CdTe on Nanopatterned Substrates.  

E-Print Network [OSTI]

??HgCdTe/Si devices can potentially be significantly improved by the use of nanopatterned substrate structures on Si to control point and extended crystal defects. This thesis (more)

Fahey, Stephen D.

2012-01-01T23:59:59.000Z

213

A Search for Neutrinoless Double Beta Decay of Te-130  

E-Print Network [OSTI]

Bolometric experiments for neutrinoless double beta 3.2.1A Search for Neutrinoless Double Beta Decay of Te by AdamSpring 2010 A Search for Neutrinoless Double Beta Decay of

Bryant, Adam Douglas

2010-01-01T23:59:59.000Z

214

INTERACTION OF DEFECTS IN CdTe-CRYSTALS HEAVILY DOPED WITH CHLORINE  

E-Print Network [OSTI]

ClTe) and (VCd 2 ClTe)] form, but larger clusters as well. Thus, the compensation process in Cl doped CdTe, PAGE In order to clarify the mechanism of compensation in semi-insulating crystals of CdTe doped.1051/rphysap:01977001202023500 #12;236 FIG. 1. - Photoluminescence spectra of In and Cl doped CdTe. ND = 10 17

Paris-Sud XI, Université de

215

REVUE DE PHYSIQUE APPLIQUE PHASE DIAGRAM CALCULATION IN THE Te-Bi-Sb TERNARY SYSTEM  

E-Print Network [OSTI]

by the stoichio- metric compounds Bi2Te3-Sb2Te3 and SnTe-PbTe [16, 17] exhibit complete miscibility in both liquid 1976) Résumé. 2014 On calcule le diagramme de l'équilibre liquide-solide dans le système ternaire Te be achieved either by means of time- and labor-consuming measurements which permit plotting the equilibrium

Boyer, Edmond

216

Electrical characteristics of the CdTe-n-CdHgTe structure fabricated in a single molecular-beam epitaxy process  

SciTech Connect (OSTI)

An extraordinary shape of the capacitance-voltage characteristics of CdTe-CdHgTe structures has been detected; these characteristics include a specific 'hump' in the inversion region, the height of which increased severalfold under illumination. Additional measurements using an optical probe, measurements of current-voltage characteristics, and an analysis of the energy-band diagram of the structure showed the following. CdTe, in contrast to CdHgTe, is a p-type semiconductor with an acceptor concentration of 1 x 10{sup 16} cm{sup -3}; there is a hole inversion layer in CdHgTe at the boundary with CdTe, which causes the 'hump'; and the barrier height for holes at the CdTe-Cd{sub 0.43}Hg{sub 0.57}Te interface was determined as 0.13 eV.

Mashukov, Yu. P., E-mail: dr_mashukov@mail.ru; Mikhailov, N. N.; Vasilyev, V. V. [Russian Academy of Sciences, Rzhanov Institute of Semiconductor Physics, Siberian Branch (Russian Federation)

2010-09-15T23:59:59.000Z

217

Phonon self-energy and origin of anomalous neutron scattering spectra in SnTe and PbTe thermoelectrics  

SciTech Connect (OSTI)

The anharmonic lattice dynamics of rock-salt thermoelectric compounds SnTe and PbTe are investigated with inelastic neutron scattering (INS) and first-principles calculations. The experiments show that, surprisingly, although SnTe is closer to the ferroelectric instability, phonon spectra in PbTe exhibit a more anharmonic character. This behavior is reproduced in first-principles calculations of the temperature-dependent phonon self-energy. Our simulations reveal how the nesting of phonon dispersions induces prominent features in the self-energy, which account for the measured INS spectra and their temperature dependence. We establish that the phase-space for three-phonon scattering processes, rather than just the proximity to the lattice instability, is the mechanism determining the complex spectrum of the transverse-optical ferroelectric mode.

Li, Chen [ORNL] [ORNL; Ma, Jie [ORNL] [ORNL; May, Andrew F [ORNL] [ORNL; Cao, Huibo [ORNL] [ORNL; Christianson, Andrew D [ORNL] [ORNL; Ehlers, Georg [ORNL] [ORNL; Singh, David J [ORNL] [ORNL; Sales, Brian C [ORNL] [ORNL; Delaire, Olivier A [ORNL] [ORNL

2014-01-01T23:59:59.000Z

218

A 3 TeV on 3 TeV proton-proton dedicated collider for Fermilab  

SciTech Connect (OSTI)

The Fermilab Dedicated Collider proposed in May 1983 is a 2 TeV on 2 TeV p)bar p) collider. The expected luminosity is )approximately) 10/sup 31/ cm/sup (minus/2)sec/sup )minus/1) and the estimated cost is )approximately) $362M (FY-83 dollars). Since 1983 both the superconducting magnet and the particle detector technologies have advanced and the countenance of physics, hence the desired characteristics of new facilities have also altered somewhat. We want to show here that with the new magnet technology used for the SSC one can construct a 3 TeV on 3 TeV pp collider on the Fermilab site. This pp Dedicated Collider )PPDC) will have a luminosity of about 10/sub 33/cm/sup )minus/2)sec)sup)minus)1) and a cost only )approximately) 50)percent) more than that of the p)bar p) Dedicated Collider. 3 figs

Teng, L.C.

1988-03-30T23:59:59.000Z

219

Experiences from a Novel Sensor for Fireside Corrosion Monitoring during Grate Combustion of Corn Stover/Wood Chip Blends  

Science Journals Connector (OSTI)

The operation of a pilot-scale online corrosion sensor system was studied at VTTs 100 kW grate pilot plant. The feedstock composition in tests was varied from 100% wood chips to a blend that also contained 40 en-% d.b. corn stover. The mass flow of ...

Timo J. Leino; Martti J. Aho; S. Juhani Gynther; Tommi A. Ruuskanen; Matti H. Hkkinen

2013-08-27T23:59:59.000Z

220

Holographic Storage of Multiple Coherence Gratings in a Bose-Einstein Condensate Yutaka Yoshikawa,1,2,* Kazuyuki Nakayama,2  

E-Print Network [OSTI]

of the condensate, a high conversion efficiency of >70% and a long storage time of >120 s were achieved. DOI: 10Holographic Storage of Multiple Coherence Gratings in a Bose-Einstein Condensate Yutaka Yoshikawa,1 in an elongated cloud of Bose-condensed atoms. Two off-resonant write beams induce superradiant Raman scattering

Torii, Yoshio

Note: This page contains sample records for the topic "te grated analy" 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

Novel Subwavelength Grating Surface Emitting Laser Michael C.Y. Huang, Ye Zhou, and Connie J. Chang-Hasnain  

E-Print Network [OSTI]

Novel Subwavelength Grating Surface Emitting Laser Michael C.Y. Huang, Ye Zhou, and Connie J. Chang, USA e-mails: cch@eecs.berkeley.edu Abstract: We present a new class of surface emitting lasers cladding layers (e.g. SiO2 or air) on the top and below. The simplicity of the design and versatility

California at Irvine, University of

222

Long-period fiber grating as wavelength selective element in double-clad Yb-doped fiber-ring lasers  

E-Print Network [OSTI]

Long-period fiber grating as wavelength selective element in double-clad Yb-doped fiber-ring lasers, 42.79.Dj, 42.81.-i 1. Introduction Cladding-pumped ytterbium-doped fiber lasers belong presently fiber laser with the cladding-pumped YDF a significant increase of the average output power can

Paris-Sud XI, Université de

223

Enhanced radiation of an invisible array of sources through a sub-wavelength metal-strip grating and applications  

Science Journals Connector (OSTI)

We experimentally demonstrate dramatically increased radiation from an invisible source placed next to a sub-wavelength metal strip grating. The invisible source is a novel highly reactive array of antennas excited by a common feed which weakly radiates in the far-zone. The metal grating used is sub-wavelength and non-resonant which typically attenuates the overall radiation of a nearby source especially in the transverse electric polarization. However we show that such a grating screen with proper dimensions placed next to the invisible source can in fact significantly enhance the radiated field strength far beyond the free space radiation of this invisible radiator by an order of magnitude. This radiation enhancement is facilitated through the conversion of evanescent waves of the specially designed reactive source into propagating waves and its level is inversely related to the source-grating distance. The physical phenomenon is shown in simulations and measurements at microwaves. This novel radiation enhancement effect is shown to have potential applications in various areas such as proximity sensing detection and measurement of distance.

M. Memarian

2013-01-01T23:59:59.000Z

224

Optoelectronic Interconnects XIII (OE112) Conference Chairs: Alexei L. Glebov, OptiGrate Corp. (USA); Ray T. Chen, The Univ.  

E-Print Network [OSTI]

Optoelectronic Interconnects XIII (OE112) Conference Chairs: Alexei L. Glebov, OptiGrate Corp. (USA); Ray T. Chen, The Univ. of Texas at Austin (USA) Program Committee: Bill Blubaugh, US Conec Ltd. (USA); Swapnajit Chakravarty, Omega Optics, Inc. (USA); John E. Cunningham, Oracle (USA); Allen M. Earman, Intersil

Jahns, Jürgen

225

Coulomb interaction of acceptors in Cd{sub 1?x}Mn{sub x}Te/CdTe quantum dot  

SciTech Connect (OSTI)

The investigation on the effect of confining potential like isotropic harmonic oscillator type potential on the binding and the Coulomb interaction energy of the double acceptors in the presence of magnetic field in a Cd{sub 1?x}Mn{sub x}Te/CdTe Spherical Quantum Dot has been made for the Mn ion composition x=0.3 and compared with the results obtained from the square well type potential using variational procedure in the effective mass approximation.

Kalpana, P.; Nithiananthi, P., E-mail: kjkumar-gri@rediffmail.com; Jayakumar, K., E-mail: kjkumar-gri@rediffmail.com [Department of Physics, Gandhigram Rural University, Gandhigram-624302, TamilNadu (India); Reuben, A. Merwyn Jasper D. [Department of Physics, School of Engineering, Saveetha University, Thandalam, Chennai- 600104, TamilNadu (India)

2014-04-24T23:59:59.000Z

226

Effects of Cu Diffusion from ZnTe:Cu/Ti Contacts on Carrier Lifetime of CdS/CdTe Thin Film Solar Cells: Preprint  

SciTech Connect (OSTI)

We study the performance of CdS/CdTe thin film PV devices processed with a ZnTe:Cu/Ti contact to investigate how carrier lifetime in the CdTe layer is affected by Cu diffusion from the contact.

Gessert, T. A.; Metzger, W. K.; Asher, S. E.; Young, M. R.; Johnston, S.; Dhere, R. G.; Duda, A.

2008-05-01T23:59:59.000Z

227

An effective medium study of surface plasmon polaritons in nanostructured gratings using attenuated total reflection  

SciTech Connect (OSTI)

Recent work studied surface plasmon resonances in structured materials by the method of attenuated total reflection using a prism on top of a metallic grating. That calculation considered Transverse Magnetic polarized radiation, involved an expansion in 121 Fourier modes, and found a number of interesting features. Many of these features were attributed to localized plasmons or other factors, which arise from a discrete structure. We use a simple effective medium theory to address the same problem, and find many of the same reflection features observed in the more complex calculation, indicating that localization is not an important factor. We also evaluate the possibility of using some of the new features in the reflection spectrum for bio-sensing and find that the sensitivity of the system to small changes in relative permittivity is increased compared to some standard methods.

Tyboroski, M. H.; Anderson, N. R.; Camley, R. E. [UCCS BioFrontiers Center, University of Colorado at Colorado Springs, Colorado Springs, Colorado 80918 (United States)

2014-01-07T23:59:59.000Z

228

Solvent-side observation on vibrational energy transfer by transient grating spectroscopy: Bridged azulene-anthracene  

E-Print Network [OSTI]

Transient grating acoustic spectroscopy has been applied to studies on the vibrational energy relaxation process of the electronic ground state of azulene, two 1-alkylazulenes, and five bridged azulene-anthracenes in three different solvents: 1,1,1-trichloro-1,2,2-trifluoroethane, acetonitrile, and xenon. The solute molecule was vibrationally excited by the photo-excitation of the auzlenyl group to the S1 state through the fast internal conversion, and the rate of solvent thermalization due to the vibrational energy relaxation was determined. The thermalization rates for 1-alkylazulenes and bridged azulene-anthracenes were faster than that of azulene. Based on the results of the thermalization rates of 1-alkylazulenes, we concluded that the acceleration of the energy dissipation from the azulenyl group induced the faster energy dissipation from the solute to the solvent. The vibrational normal mode analysis suggests that the density of the vibrational modes and anharmonic coupling between the vibrational mode...

Fujiwara, Hiroki

2014-01-01T23:59:59.000Z

229

Adaptation of UVSOR-Type Plane-Grating Monochromator in Saga  

SciTech Connect (OSTI)

The plane grating monochromator (PGM) is one of the most useful monochromators in the world. The design concept of the PGM originates from the characteristics of synchrotron radiation itself, namely parallel rays and small source size. Since the performance of the PGM depends on the beam emittance of the storage ring, it is expected that even the used PGM may be utilized in recent facility. Therefore, the UVSOR-type PGM that had been used for more than twenty years in UVSOR was adapted to the university's branch beamline in Saga-LS with several modifications. The performance tests were carried out with a photoelectron spectrometer, and the observed values were compared with the ray-tracing calculation. The results show that the adaptation of the UVSOR-type PGM is good enough to study new functional materials.

Sugiyama, H.; Takahashi, K.; Ogawa, K.; Azuma, J.; Kamada, M. [Synchrotron Light Application Center, Saga University, Saga 840-8502 (Japan)

2010-06-23T23:59:59.000Z

230

A transmission grating spectrograph and its application in both laser plasma and plasma focus  

Science Journals Connector (OSTI)

A new transmission gratingspectrograph for soft x-raymeasurement in pulsed plasmas was designed and studied. The spectrograph has an adjustment system with three degrees of freedom together with an electronic-controlled camera. This design makes it easy to align and use for laser-produced plasmas or the plasma focus. The spectrograph provides spatially resolved spectrum in two dimensions and has a wavelength range of 0.330 nm. A transmission grating was used to obtain spatially resolved spectra from plasmas produced by laser-irradiated solid target and gas filled plasma focus. Such a spectrograph is suitable for coupling with a soft x-ray streak camera or a soft x-ray charge coupled device detector for time-resolved studies.

X. Feng; M. H. Liu; S. Lee

1997-01-01T23:59:59.000Z

231

A soft x-ray transmission grating imaging-spectrometer for the National Ignition Facility  

SciTech Connect (OSTI)

A soft x-ray transmission grating spectrometer has been designed for use on high energy-density physics experiments at the National Ignition Facility (NIF); coupled to one of the NIF gated x-ray detectors (GXD) it records sixteen time-gated spectra between 250 and 1000eV with 100ps temporal resolution. The trade-off between spectral and spatial resolution leads to an optimized design for measurement of emission around the peak of a 100-300eV blackbody spectrum. Performance qualification results from the NIF, the Trident Laser Facility and VUV beamline at the National Synchrotron Light Source (NSLS), evidence a <100{micro}m spatial resolution in combination with a source-size limited spectral resolution that is <10eV at photon energies of 300eV.

Moore, A S; Guymer, T M; Kline, J L; Morton, J; Taccetti, M; Lanier, N E; Bentley, C; Workman, J; Peterson, B; Mussack, K; Cowan, J; Prasad, R; Richardson, M; Burns, S; Kalantar, D H; Benedetti, L R; Bell, P; Bradley, D; Hsing, W; Stevenson, M

2012-05-01T23:59:59.000Z

232

A soft x-ray transmission grating imaging-spectrometer for the National Ignition Facility  

SciTech Connect (OSTI)

A soft x-ray transmission grating spectrometer has been designed for use on high energy-density physics experiments at the National Ignition Facility (NIF); coupled to one of the NIF gated x-ray detectors it records 16 time-gated spectra between 250 and 1000 eV with 100 ps temporal resolution. The trade-off between spectral and spatial resolution leads to an optimized design for measurement of emission around the peak of a 100-300 eV blackbody spectrum. Performance qualification results from the NIF, the Trident Laser Facility and vacuum ultraviolet beamline at the National Synchrotron Light Source, evidence a <100 {mu}m spatial resolution in combination with a source-size limited spectral resolution that is <10 eV at photon energies of 300 eV.

Moore, A. S.; Guymer, T. M.; Morton, J.; Bentley, C.; Stevenson, M. [Directorate Science and Technology, AWE Aldermaston, Reading, RG7 4PR (United Kingdom); Kline, J. L.; Taccetti, M.; Lanier, N. E.; Workman, J.; Peterson, B.; Mussack, K.; Cowan, J. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Prasad, R.; Richardson, M.; Burns, S.; Kalantar, D. H.; Benedetti, L. R.; Bell, P.; Bradley, D.; Hsing, W. [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551-0808 (United States)

2012-10-15T23:59:59.000Z

233

X-Atlas: An Online Archive of Chandra's Stellar High Energy Transmission Gratings Observations  

E-Print Network [OSTI]

The high-resolution X-ray spectroscopy made possible by the 1999 deployment of the Chandra X-ray Observatory has revolutionized our understanding of stellar X-ray emission. Many puzzles remain, though, particularly regarding the mechanisms of X-ray emission from OB stars. Although numerous individual stars have been observed in high-resolution, realizing the full scientific potential of these observations will necessitate studying the high-resolution Chandra dataset as a whole. To facilitate the rapid comparison and characterization of stellar spectra, we have compiled a uniformly processed database of all stars observed with the Chandra High Energy Transmission Grating (HETG). This database, known as X-Atlas, is accessible through a web interface with searching, data retrieval, and interactive plotting capabilities. For each target, X-Atlas also features predictions of the low-resolution ACIS spectra convolved from the HETG data for comparison with stellar sources in archival ACIS images. Preliminary analyses of the hardness ratios, quantiles, and spectral fits derived from the predicted ACIS spectra reveal systematic differences between the high-mass and low-mass stars in the atlas and offer evidence for at least two distinct classes of high-mass stars. A high degree of X-ray variability is also seen in both high and low-mass stars, including Capella, long thought to exhibit minimal variability. X-Atlas contains over 130 observations of approximately 25 high-mass stars and 40 low-mass stars and will be updated as additional stellar HETG observations become public. The atlas has recently expanded to non-stellar point sources, and Low Energy Transmission Grating (LETG) observations are currently being added as well.

Owen W. Westbrook; Nancy Remage Evans; Scott J. Wolk; Vinay L. Kashyap; Joy S. Nichols; Peter J. Mendygral; Jonathan D. Slavin; Bradley Spitzbart; Wayne L. Waldron

2007-12-04T23:59:59.000Z

234

Influencing factors on NOX emission level during grate conversion of three pelletized energy crops  

Science Journals Connector (OSTI)

Abstract NOX emission behavior of three different pelletized energy crops, a herbaceous one, Brassica carinata, a short rotation coppice, Populus sp., and a blend of them, was assessed during fixed grate conversion. Measurements of NOX emissions were done at combustion conditions that yielded both thermal efficiency and CO emissions according to the European norm (EN 303-5:2012), and results compared to limits established by the Austrian deviations. Based on the experimental data, NOX results fulfilled the Austrian restrictions except during combustion of brassica, which exhibited the highest Fuel-N content. The Fuel-NOX was identified as the main formation mechanism. An opposite relation was determined between the specific NOX emissions and the Fuel-N conversion ratio obtained between the N-rich and the N-lean fuels tested here. The influence of the air supply (amount and distribution) on the NOX formation was also noticeable. In general, a higher proportion of air increased the specific NOX emissions and the Fuel-N conversion ratio. Possibilities to control the NOX emissions level by air staging were rather limited, particularly, during combustion of brassica and the blend because of their peculiarities as ash-rich fuels with high slag formation risk. For attaining an appropriate conversion of these fuels, primary air requirements substantially increased. Due to limitations found during the energy crops conversion, efforts to minimize the level of NOX emissions identified here for the troublesome fuels tested should be mainly focused on attaining both a properly designed air supply system and the grate temperature control as well as on conditioning the Fuel-N content, for instance, by blending.

Maryori Daz-Ramrez; Fernando Sebastin; Javier Royo; Adeline Rezeau

2014-01-01T23:59:59.000Z

235

High Neutron Fluence Survivability Testing of Advanced Fiber Bragg Grating Sensors  

SciTech Connect (OSTI)

The motivation for the reported research was to support NASA space nuclear power initiatives through the development of advanced fiber optic sensors for space-based nuclear power applications. The purpose of the high-neutron fluence testing was to demonstrate the survivability of fiber Bragg grating (FBG) sensors in a fission reactor environment. 520 FBGs were installed in the Ford reactor at the University of Michigan. The reactor was operated for 1012 effective full power hours resulting in a maximum neutron fluence of approximately 5x1019 n/cm2, and a maximum gamma dose of 2x103 MGy gamma. This work is significant in that, to the knowledge of the authors, the exposure levels obtained are approximately 1000 times higher than for any previously published experiment. Four different fiber compositions were evaluated. An 87% survival rate was observed for fiber Bragg gratings located at the fuel centerline. Optical Frequency Domain Reflectometry (OFDR), originally developed at the NASA Langley Research Center, can be used to interrogate several thousand low-reflectivity FBG strain and/or temperature sensors along a single optical fiber. A key advantage of the OFDR sensor technology for space nuclear power is the extremely low mass of the sensor, which consists of only a silica fiber 125{mu}m in diameter. The sensors produced using this technology will fill applications in nuclear power for current reactor plants, emerging Generation-IV reactors, and for space nuclear power. The reported research was conducted by Luna Innovations and was funded through a Small Business Innovative Research (SBIR) contract with the NASA Glenn Research Center.

Fielder, Robert S.; Klemer, Daniel; Stinson-Bagby, Kelly L. [Luna Innovations, Inc., 2851 Commerce Street, Blacksburg, VA 24060 (United States)

2004-02-04T23:59:59.000Z

236

Influence of EDTA{sup 2-} on the hydrothermal synthesis of CdTe nanocrystallites  

SciTech Connect (OSTI)

Transformation from Te nanorods to CdTe nanoparticles was achieved with the assistance of EDTA as a ligand under hydrothermal conditions. Experimental results showed that at the beginning of reaction Te nucleated and grew into nanorods. With the proceeding of reaction, CdTe nucleus began to emerge on the surface, especially on the tips of Te nanorods. Finally, nearly monodispersed hexagonal CdTe nanoparticles with diameters of about 200 nm were obtained. The effects of EDTA on the morphology and formation of CdTe nanoparticles were discussed in consideration of the strong ligand-effect of EDTA, which greatly decreased the concentration of Cd{sup 2+}. Furthermore, the possible formation process of CdTe nanoparticles from Te nanorods was further proposed. The crystal structure and morphology of the products were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). - Graphical Abstract: Firstly, Te nucleated and grew into nanorods in the presence of EDTA{sup 2-}. Then CdTe nucleus began to emerge on Te nanorods and finally monodispersed CdTe nanoparticles were obtained. Highlights: Black-Right-Pointing-Pointer EDTA serves as a strong ligand with Cd{sup 2+}. Black-Right-Pointing-Pointer The existence of EDTA constrains the nucleation of CdTe and promotes the formation of Te nanorods. Black-Right-Pointing-Pointer With the proceeding of reaction, CdTe nucleus began to emerge on the surface, especially on the tips of Te nanorods. Black-Right-Pointing-Pointer Nearly monodispersed hexagonal CdTe nanoparticles with diameters of about 200 nm were finally obtained.

Gong Haibo [Center of Bio and Micro/nano Functional Materials, State Key Lab of Crystal Materials, Shandong University, Jinan 250100 (China); School of Materials Science and Engineering, University of Jinan, Jinan 250022 (China); Hao Xiaopeng, E-mail: xphao@sdu.edu.cn [Center of Bio and Micro/nano Functional Materials, State Key Lab of Crystal Materials, Shandong University, Jinan 250100 (China); Wu Yongzhong [Center of Bio and Micro/nano Functional Materials, State Key Lab of Crystal Materials, Shandong University, Jinan 250100 (China); Cao Bingqiang; Xu Hongyan [School of Materials Science and Engineering, University of Jinan, Jinan 250022 (China); Xu Xiangang [Center of Bio and Micro/nano Functional Materials, State Key Lab of Crystal Materials, Shandong University, Jinan 250100 (China)

2011-12-15T23:59:59.000Z

237

Electrical Characterization of Cu Composition Effects in CdS/CdTe Thin-Film Solar Cells with a ZnTe:Cu Back Contact: Preprint  

SciTech Connect (OSTI)

We study the effects of Cu composition on the CdTe/ZnTe:Cu back contact and the bulk CdTe. For the back contact, its potential barrier decreases with Cu concentration while its saturation current density increases. For the bulk CdTe, the hole density increases with Cu concentration. We identify a Cu-related deep level at {approx}0.55 eV whose concentration is significant when the Cu concentration is high. The device performance, which initially increases with Cu concentration then decreases, reflects the interplay between the positive influences and negative influences (increasing deep levels in CdTe) of Cu.

Li, J. V.; Duenow, J. N.; Kuciauskas, D.; Kanevce, A.; Dhere, R. G.; Young, M. R.; Levi, D. H.

2012-07-01T23:59:59.000Z

238

Metallurgy, thermal stability, and failure mode of the commercial Bi-Te-based thermoelectric modules.  

SciTech Connect (OSTI)

Bi-Te-based thermoelectric (TE) alloys are excellent candidates for power generation modules. We are interested in reliable TE modules for long-term use at or below 200 C. It is known that the metallurgical characteristics of TE materials and of interconnect components affect the performance of TE modules. Thus, we have conducted an extensive scientific investigation of several commercial TE modules to determine whether they meet our technical requirements. Our main focus is on the metallurgy and thermal stability of (Bi,Sb){sup 2}(Te,Se){sup 3} TE compounds and of other materials used in TE modules in the temperature range between 25 C and 200 C. Our study confirms the material suite used in the construction of TE modules. The module consists of three major components: AlN cover plates; electrical interconnects; and the TE legs, P-doped (Bi{sub 8}Sb{sub 32})(Te{sub 60}) and N-doped (Bi{sub 37}Sb{sub 3})(Te{sub 56}Se{sub 4}). The interconnect assembly contains Sn (Sb {approx} 1wt%) solder, sandwiched between Cu conductor with Ni diffusion barriers on the outside. Potential failure modes of the TE modules in this temperature range were discovered and analyzed. The results show that the metallurgical characteristics of the alloys used in the P and N legs are stable up to 200 C. However, whole TE modules are thermally unstable at temperatures above 160 C, lower than the nominal melting point of the solder suggested by the manufacture. Two failure modes were observed when they were heated above 160 C: solder melting and flowing out of the interconnect assembly; and solder reacting with the TE leg, causing dimensional swelling of the TE legs. The reaction of the solder with the TE leg occurs as the lack of a nickel diffusion barrier on the side of the TE leg where the displaced solder and/or the preexisting solder beads is directly contact the TE material. This study concludes that the present TE modules are not suitable for long-term use at temperatures above 160 C due to the reactivity between the Sn-solder and the (Bi,Sb){sup 2}(Te,Se){sup 3} TE alloys. In order to deploy a reliable TE power generator for use at or below 200 C, alternate interconnect materials must be used and/or a modified module fabrication technique must be developed.

Yang, Nancy Y. C.; Morales, Alfredo Martin

2009-02-01T23:59:59.000Z

239

Effect of solvents on morphologies of PbTe nanostructures: Controllable synthesis of hollow and solid PbTe nanocubes by a solvothermal method  

SciTech Connect (OSTI)

We demonstrate a facile solvothermal route to grow hollow and solid PbTe nanocubes. The hollow PbTe nanocubes were successfully achieved when EtOH was used as solvent in the presence of nonionic polymer PEG, while the solid PbTe nanocubes were obtained when EG was used as solvent in the presence of PEG, whilst keeping the other experimental conditions constant. The results indicate that the solvents used in reaction system play a key role to determine the interior structure of PbTe nanocubes. On the basis of the experimental results and analysis, a possible growth mechanism has been discussed in detail for the hollow and solid PbTe nanocubes. - Graphical abstract: A facile solution-phase route has been developed to synthesize hollow and solid PbTe nanocubes. The possible growth mechanism of hollow and solid PbTe nanocubes was discussed in detail. Highlights: Black-Right-Pointing-Pointer A facile controllable route was described for hollow and solid PbTe nanocubes. Black-Right-Pointing-Pointer The hollow PbTe nanocubes were achieved using EtOH as solvent. Black-Right-Pointing-Pointer The solid PbTe nanocubes were obtained using EG as solvent. Black-Right-Pointing-Pointer The solvent played a key role for the formation of hollow and solid PbTe nanocubes.

Wang Wenzhong, E-mail: wzhwang@aphy.iphy.ac.cn [School of Science, Minzu University of China, Beijing 100081 (China); Wang Lijuan [School of Science, Minzu University of China, Beijing 100081 (China); Zhou Qing [College of Science, Guizhou University, Guiyang 550025 (China)

2012-04-15T23:59:59.000Z

240

Hadron supercolliders: The 1-TeV scale and beyond  

SciTech Connect (OSTI)

Greater understanding of the connection between the weak and electromagnetic interactions is central to progress in elementary-particle physics. A definitive exploration of the mechanism for electroweak symmetry breaking will require collisions between fundamental constituents at energies on the order of 1 TeV. This goal drives the design of high-energy, high-luminosity hadron colliders that will be commissioned during the next decade, but by no means completely defines their scientific potential. These three lectures are devoted to a review of the standard-model issues that motivated an experimental assault on the 1-TeV scale, an introduction to the machines and the experimental environment they will present, and a survey of possibilities for measurement and discovery with a multi-TeV hadron collider. 72 refs., 29 figs.

Quigg, C.

1990-08-10T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

Plane grating as polar heliostat in eclipse observations of the chromosphere and prominences with special application to studies of Doppler-widened Thomson-scattered Fraunhofer lines  

Science Journals Connector (OSTI)

Attention is drawn to a very simple instrumental arrangement for eclipse observations of the spectra of the chromosphere and prominences using a plane grating as polar heliostat and a short focus camera. A discus...

Yngve hman

1979-06-01T23:59:59.000Z

242

To grate a liquid into tiny droplets by its impact on a hydrophobic micro-grid F. Lapierre, F. Zoueshtiagh, V. Thomy, and A. Merlen  

E-Print Network [OSTI]

To grate a liquid into tiny droplets by its impact on a hydrophobic micro-grid P. Brunet, F (Dated: November 30, 2009) We report on experiments of drop impacting a hydrophobic micro-grid

Brunet, Philippe

243

What causes high resistivity in CdTe  

SciTech Connect (OSTI)

Shallow donors are often introduced into semiconductor materials to enhance n-type conductivity. However, they can sometimes also be used to obtain compensation between donors and acceptors, resulting in high resistivity in semiconductors. For example, CdTe can be made semi-insulating by shallow donor doping. This is routinely done to obtain high resistivity in CdTe-based radiation detectors. However, it is widely believed that the shallow donor alone cannot be responsible for the high resistivity in CdTe. This is based on the argument that it is practically impossible to control the shallow donor doping level so precisely that the free carrier density can be brought below the desired value suitable for radiation detection applications. Therefore, a deep native donor is usually assumed to exist in CdTe and pin the Fermi level near midgap. In this paper, we present our calculations on carrier statistics and energetics of shallow donors and native defects in CdTe and illustrate different donor-specific mechanisms for achieving carrier compensation. Our results show that the shallow donor can be used to reliably obtain high resistivity in CdTe without requiring additional deep donors. Since radiation detection applications require both high resistivity and good carrier transport, one should generally use shallow donors and shallow acceptors for carrier compensation and avoid deep centers that are effective carrier traps. This study highlights how the interaction between impurities and native defects intricately affects the Fermi level pinning in the semiconductor band gap and the associated resistivity of the material.

Biswas, Koushik [ORNL; Du, Mao-Hua [ORNL

2012-01-01T23:59:59.000Z

244

Optically induced magnetic polarons in EuTe  

SciTech Connect (OSTI)

Direct measurements of the photoinduced magnetization in EuTe, using a two color pump-and-probe technique, are presented. The photoinduced effect was pumped using photons of above-the-bandgap energy, and detected by the Faraday rotation of a probe beam of energy below-the-bandgap. The photoinduced Faraday rotation changes sign, as expected from our model for the optically induced magnetic polaron. The EuTe spin-flop transition at low fields is also detected as a sharp step in the photoinduced Faraday rotation, and its observation provides additional supports for the photoinduced polaron model.

Henriques, A. B.; Galgano, G. D. [Instituto de Fsica, Universidade de So Paulo, Caixa Postal 66318, 05315-970, So Paulo (Brazil); Abramof, E.; Rappl, P. H. O. [LAS - INPE, Av. Dos Astronautas, 1758, 12227-010, So Jos dos Campos (Brazil)

2013-12-04T23:59:59.000Z

245

Precision Calibration of the NuTeV Calorimeter  

E-Print Network [OSTI]

NuTeV is a neutrino-nucleon deep-inelastic scattering experiment at Fermilab. The detector consists of an iron-scintillator sampling calorimeter interspersed with drift chambers, followed by a muon toroidal spectrometer. We present determinations of response and resolution functions of the NuTeV calorimeter for electrons, hadrons, and muons over an energy range of 4.8 to 190 GeV. The absolute hadronic energy scale is determined to an accuracy of 0.43%. We compare our measurements to predictions from calorimeter theory and GEANT3 simulations.

The NuTeV Collaboration; D. A. Harris; J. Yu

1999-08-20T23:59:59.000Z

246

Relativistic calculations of electronic states of TeH  

Science Journals Connector (OSTI)

Relativistic configuration interaction calculations of five ?? states [3/2 1/2 1/2(II) 3/2(II) 5/2] of TeH are carried out. Comparison calculations of the 2? and 4? ?s states are also carried out with the objective of understanding the effect of spinorbit interaction on the electronic states of TeH. These calculations enable assignment of some of the experimentally observed spectra. The 1/2(II) 3/2(II) and 5/2 states exhibit interesting avoided crossings.

K. Balasubramanian; Ming Han; M. Z. Liao

1987-01-01T23:59:59.000Z

247

Measurement method for roll angular displacement with a high resolution by using diffraction gratings and a heterodyne interferometer  

SciTech Connect (OSTI)

The roll angle measurement is difficult to be achieved directly using a typical commercial interferometer due to its low sensitivity in axial direction, where the axial direction is orthogonal to the plane of the roll angular displacement. A roll angle measurement method combined diffraction gratings with a laser heterodyne interferometer is discussed in this paper. The diffraction grating placed in the plane of a roll angular displacement and the interferometer arranged in the plane's orthogonal direction, constitute the measurement pattern for the roll angle with high resolution. The roll angular displacement, considered as the linear, can be tested precisely when the corresponding angle is very small. Using the proposed method, the angle roll measurement obtains the high resolution of 0.002{sup ?}. Experiment has proved its feasibility and practicability.

Tang, Shanzhi, E-mail: shanzhit@gmail.com [Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China) [Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China); School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049 (China); Wang, Zhao [School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049 (China)] [School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049 (China); Gao, Jianmin; Guo, Junjie [State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710054 (China)] [State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710054 (China)

2014-04-15T23:59:59.000Z

248

Spectrally enhancing near-field radiative heat transfer by exciting magnetic polariton in SiC gratings  

E-Print Network [OSTI]

In the present work, we theoretically demonstrate, for the first time, that near field radiative transport between 1D periodic grating microstructures separated by subwavelength vacuum gaps can be significantly enhanced by exciting magnetic resonance or polariton. Fluctuational electrodynamics that incorporates scattering matrix theory with rigorous coupled wave analysis is employed to exactly calculate the near field radiative heat flux between two SiC gratings. Besides the well known coupled surface phonon polaritons (SPhP), an additional spectral radiative heat flux peak, which is due to magnetic polariton, is found within the phonon absorption band of SiC. The mechanisms, behaviors and interplays between magnetic polariton, coupled SPhP, single interface SPhP, and Wood's anomaly in the near field radiative transport are elucidated in detail. The findings will open up a new way to control near field radiative heat transfer by magnetic resonance with micro or nanostructured metamaterials.

Yang, Yue

2015-01-01T23:59:59.000Z

249

Euler-Euler simulation of wood chip combustion on a grate - effect of fuel moisture content and full scale application  

Science Journals Connector (OSTI)

Nowadays, it is common practice to perform CFD calculations for optimisation purposes of technical biomass combustion applications. A numerical model for wood chip combustion on grate firing arrangements has been developed. The model is based on an Euler-Euler approach, enabling a detailed multiphase description of the combustion chamber in terms of flow, turbulence and heat transfer. The model explicitly accounts for interactions between bed and freeboard region and comprises a global description of the whole incineration process associated with wood combustion. For validation purposes, the effect of fuel moisture content in a 240 kWth test facility has been observed experimentally and the results are opposed to the model predictions. Additionally, measurements within a 58 MWth full scale grate firing system have been conducted and the scalability of the numerical model towards industrial applications is investigated.

D. Kurz; U. Schnell; G. Scheffknecht

2013-01-01T23:59:59.000Z

250

Resonant modes of a bottle-shaped cavity and their effects in the response of finite and infinite gratings  

Science Journals Connector (OSTI)

The resonant frequencies of a one-dimensional bottle-shaped cavity embedded in a ground plane are calculated using a modal approach for s and p polarizations. The same formalism is used to solve the problem of scattering from a surface with a finite number of cavities and from an infinite periodic grating. We show numerical results where the resonant behavior is evidenced as dips in the curve of intensity specularly reflected from a surface with one or several bottle-shaped grooves. The surface shape resonances of a single cavity are also shown to have a great influence on the efficiency distribution of the diffracted orders from infinite gratings made of bottle-shaped cavities. The excitation of even and odd modes is analyzed for both polarizations.

Ricardo A. Depine and Diana C. Skigin

2000-04-01T23:59:59.000Z

251

PRECONTACT SURFACE CHEMISTRY EFFECTS ON CdWCdTe SOLAR CELL PERFORMANCE AND STABILITY  

E-Print Network [OSTI]

PRECONTACT SURFACE CHEMISTRY EFFECTS ON CdWCdTe SOLAR CELL PERFORMANCE AND STABILITY Dave Albin (CBD) and close spaced sublimation (CSS) respectively. CdTe growth is followed by either solution

Sites, James R.

252

Impurity and back contact effects on CdTe/CdS thin film solar cells.  

E-Print Network [OSTI]

??CdTe/CdS thin film solar cells are the most promising cost-effective solar cells. The goal of this project is to improve the performance for CdS/CdTe devices (more)

Zhao, Hehong

2008-01-01T23:59:59.000Z

253

Resonant Level Enhancement of the Thermoelectric Power of Bi2Te3...  

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

Power of Bi2Te3 with Tin Application to practical p-type thermoelectric tin alloys for heat pumps. heremans.pdf More Documents & Publications The tin impurity in Bi0.5Sb1.5Te3...

254

Pressure-induced Phase Transition in Thiol-capped CdTe Nanoparticles  

SciTech Connect (OSTI)

Phase transitions for CdTe nanoparticles (NPs) under high pressure up to 37.0 GPa have been studied using fluorescence measurements. The phase transition from cinnarbar to rocksalt phase has been observed in CdTe NPs solution at 5.8 GPa, which is much higher than the phase transition pressure of bulk CdTe (3.8 GPa) and that of CdTe NPs in solid form (0.8 GPa). CdTe NPs solution therefore shows elevated phase transition pressure and enhanced stability against pressure compared with bulk CdTe and CdTe NPs in solid forms. The enhanced stability of CdTe NPs solution has been attributed to possible shape change in the phase transition and/or inhomogeneous strains in nanoparticle solutions.

Wu, F; Zaug, J; Young, C; Zhang, J Z

2006-11-29T23:59:59.000Z

255

Ligand Mediated Surface Reconstruction of Photoluminescent CdTe Quantum Dots.  

E-Print Network [OSTI]

??Enhancement of photoluminescence (PL) is observed for light-shielded dodecylamine-capped colloidal CdTe quantum dots (CdTe/DDA QDs) dispersed in toluene after washing and recapping. The PL quantum (more)

Onnink, A.J.

2013-01-01T23:59:59.000Z

256

Development of Materials and Structures for p-type Contacts in CdTe Solar Cells.  

E-Print Network [OSTI]

??Solar cells based on CdTe absorbers are attractive due to the optimal direct band gap energy and large absorption coefficient of CdTe, however, their performance (more)

Ferizovic, Dino

2012-01-01T23:59:59.000Z

257

WAVELENGTH DEPENDENT EFFECTIVE TRAP DENSITY IN CdTe : EVIDENCE FOR THE PRESENCE OF TWO  

E-Print Network [OSTI]

1 WAVELENGTH DEPENDENT EFFECTIVE TRAP DENSITY IN CdTe : EVIDENCE FOR THE PRESENCE OF TWO.1016/S0030-4018(96)00516-0 #12;2 Photorefractive semiconductors like CdTe are characterized by a low

258

Change in the current-carrier concentration upon doping PbTe with gallium  

SciTech Connect (OSTI)

Upon doping PbTe with gallium, both high-resistivity samples with intrinsic conductivity and low-resistivity samples with electronic conductivity (n/sub e/ = 10/sup 18/ cm/sup -3/) are produced on the PbTe-GaTe section. A thorough investigation of the dependence of the thermo-emf of Pb/sub 1-x/Ga/sub x/Te on the excess Pb and Te side showed the presence of a wide region with intrinsic conductivity. The experimental data can be explained by the fact that impure gallium in PbTe has negative Hubbard energy and stabilizes the Fermi level almost at the center of the forbidden band. At high gallium concentrations, Ga/sub 2/Te/sub 3/ precipitates at first, and then GaTe precipitates as well. The lead forming in excess transforms Ga/sup 3 +/ to Ga/sup +/, which produces the electronic conductivity in the material.

Bushmarina, G.S.; Gruzinov, B.F.; Drabkin, I.A.; Lev, E.Ya.; Moizhes, B.Ya; Suprun, S.G.

1987-07-01T23:59:59.000Z

259

Junction Evolution During Fabrication of CdS/CdTe Thin-film PV Solar Cells (Presentation)  

SciTech Connect (OSTI)

Discussion of the formation of CdTe thin-film PV junctions and optimization of CdTe thin-film PV solar cells.

Gessert, T. A.

2010-09-01T23:59:59.000Z

260

1. INTRODUCTION CdTe/CdS solar cells are among the most promising  

E-Print Network [OSTI]

Te/CdS SOLAR CELLS A.Romeo, A.N. Tiwari, and H. Zogg Thin Films Physics Group, Institute of Quantum ElectronicsTe/CdS thin film solar cells. The merits of different TCOs and the properties of the CdTe/CdS solar cells1. INTRODUCTION CdTe/CdS solar cells are among the most promising devices for low cost and high

Romeo, Alessandro

Note: This page contains sample records for the topic "te grated analy" 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

Detector Performance of Ammonium-Sulfide-Passivated CdZnTe and CdMnTe Materials  

SciTech Connect (OSTI)

Dark currents, including those in the surface and bulk, are the leading source of electronic noise in X-ray and gamma detectors, and are responsible for degrading a detector's energy resolution. The detector material itself determines the bulk leakage current; however, the surface leakage current is controllable by depositing appropriate passivation layers. In previous research, we demonstrated the effectiveness of surface passivation in CZT (CdZnTe) and CMT (CdMnTe) materials using ammonium sulfide and ammonium fluoride. In this research, we measured the effect of such passivation on the surface states of these materials, and on the performances of detectors made from them.

Kim, K.H.; Bolotnikov, A.E.; Camarda, G.S.; Marchini, L.; Yang, G.; Hossain, A.; Cui, Y.; Xu, L.; and James, R.B.

2010-08-01T23:59:59.000Z

262

Nanoscale Imaging of Photocurrent and Efficiency in CdTe Solar Cells  

Science Journals Connector (OSTI)

Nanoscale Imaging of Photocurrent and Efficiency in CdTe Solar Cells ... The local collection characteristics of grain interiors and grain boundaries in thin-film CdTe polycrystalline solar cells are investigated using scanning photocurrent microscopy. ... photovoltaics; CdTe; scanning photocurrent microscopy; solar cells; NSOM ...

Marina S. Leite; Maxim Abashin; Henri J. Lezec; Anthony Gianfrancesco; A. Alec Talin; Nikolai B. Zhitenev

2014-10-15T23:59:59.000Z

263

Carbon Sequestration in Terrestrial Ecosystems (CSiTE) PRINCIPAL INVESTIGATOR: Stan D. Wullschleger  

E-Print Network [OSTI]

Carbon Sequestration in Terrestrial Ecosystems (CSiTE) PRINCIPAL INVESTIGATOR: Stan D. Wullschleger://csite.eds.ornl.gov PROJECT DESCRIPTION The Carbon Sequestration in Terrestrial Ecosystems (CSiTE) project conducts research of switchgrass growing in the field. #12;Carbon Sequestration in Terrestrial Ecosystems (CSiTE) tion of inputs

264

NREL study may provide future guidance in improving CdS/CdTe photovoltaic device performance.  

E-Print Network [OSTI]

NREL study may provide future guidance in improving CdS/CdTe photovoltaic device performance. The majority of minority carrier lifetime (MCL) studies performed on CdS/CdTe photovoltaic (PV) devices have Carrier Lifetime Measurements in Superstrate and Substrate CdTe PV Devices." Proc. 37th IEEE Photovoltaic

265

Low temperature growth of ZnTe by synchroton radiation using metalorganic sources  

Science Journals Connector (OSTI)

The use of synchrotron radiation to convert diethylzinc and diethyltelluride molecules into ZnTe has been employed for ZnTe growth. The formation of ZnTe epitaxial layer on (100) oriented GaAs substrate at room temperature is experimentally demonstrated. It is shown by x?ray photoelectron spectroscopy that no carbon is included in the film. ?

Makoto Ikejiri; Toshihiro Ogata; Hiroshi Ogawa; Mitsuhiro Nishio; Akira Yoshida

1994-01-01T23:59:59.000Z

266

Solar Energy Materials & Solar Cells 91 (2007) 13881391 Bifacial configurations for CdTe solar cells  

E-Print Network [OSTI]

Solar Energy Materials & Solar Cells 91 (2007) 1388­1391 Bifacial configurations for CdTe solar We present a different back contact for CdTe solar cell by the application of only a transparent that acts as a free-Cu stable back contact and at the same time allows to realize bifacial CdTe solar cells

Romeo, Alessandro

267

PHOTOSCANNING OF CdTe DETECTORS FOR INVESTIGATION OF CRYSTAL QUALITY  

E-Print Network [OSTI]

349 PHOTOSCANNING OF CdTe DETECTORS FOR INVESTIGATION OF CRYSTAL QUALITY AND CONTACT BEHAVIOUR P. A. Preliminary results are reported on light scanning of CdTe detectors with a mechanical scanning system using is absorbed in CdTe with an absorption length of appro- ximately 10 gm. The two mirrors were driven

Paris-Sud XI, Université de

268

Optical implementation of entangled multi-spin states in a CdTe quantum well  

E-Print Network [OSTI]

Optical implementation of entangled multi-spin states in a CdTe quantum well J.M. Baoa , A in a CdTe quantum well. Our method, relying on the exchange interaction between optically excited holes; 78.67.De; 42.50.Md Keywords: A. CdTe quantum wells; D. Ultrafast optics; D. Quantum computation; D

Bao, Jiming

269

Structural tuning of color chromaticity through nonradiative energy transfer by interspacing CdTe nanocrystal monolayers  

E-Print Network [OSTI]

Structural tuning of color chromaticity through nonradiative energy transfer by interspacing CdTe transfer in the heterostructure of layer-by-layer spaced CdTe nanocrystal NC solids. We achieved highly demonstrated efficient FRET in LbL assembled bilayers of CdTe NCs. In another structure, alternating layers

Demir, Hilmi Volkan

270

USE OF VARIOUS DEVICE GEOMETRIES TO IMPROVE THE PERFORMANCE OF CdTe DETECTORS (*)  

E-Print Network [OSTI]

343 USE OF VARIOUS DEVICE GEOMETRIES TO IMPROVE THE PERFORMANCE OF CdTe DETECTORS (*) K. ZANIO. - The most direct method of increasing the resolution of CdTe gamma ray and x-ray detectors is to increase of Environmental and Biomedical Research. doped CdTe. Devices do not polarize as those having blocking contacts

Paris-Sud XI, Université de

271

NUMERICAL MODELING OF CIGS AND CdTe SOLAR CELLS: SETTING THE BASELINE  

E-Print Network [OSTI]

NUMERICAL MODELING OF CIGS AND CdTe SOLAR CELLS: SETTING THE BASELINE M. Gloeckler, A. Consequently specific baseline parameters for CIGS and CdTe are proposed. The modeling results important complications that are often found in experimental CIGS and CdTe solar cells. 1. INTRODUCTION

Sites, James R.

272

USE OF CdTe DETECTORS IN BONE MINERAL MEASUREMENTS J. VOGEL, J. ULLMAN  

E-Print Network [OSTI]

375 USE OF CdTe DETECTORS IN BONE MINERAL MEASUREMENTS J. VOGEL, J. ULLMAN Nuclear Medicine. Cet ensemble emploie des détecteurs CdTe mesurant la transmission d'un faisceau collimaté de rayons X periods of prolonged bedrest or weightlessness. The unit employs CdTe detectors to mea- sure

Paris-Sud XI, Université de

273

Nonresonant four-wave mixing in photorefractive CdTe crystals using a picosecond parametric generator  

E-Print Network [OSTI]

Nonresonant four-wave mixing in photorefractive CdTe crystals using a picosecond parametric at nonresonant interaction, thus allowing a study of time-resolved carrier transport in CdTe crystals to be made space-charge SC electric fields have been studied in vanadium or germanium doped semi-insulating CdTe

Boyer, Edmond

274

IMPROVEMENTS IN THE MANUFACTURE OF CdTe GAMMA RAY DETECTORS  

E-Print Network [OSTI]

141 IMPROVEMENTS IN THE MANUFACTURE OF CdTe GAMMA RAY DETECTORS S. BRELANT The Aerospace been made in the quality of chlorine-doped CdTe crystals manufactured by the traveling heater method applications of CdTe gamma ray detectors has been the continuous measurement of ablating materials

Paris-Sud XI, Université de

275

CRYSTAL GROWTH BY SOLVENT TECHNIQUES AND CHARACTERISTIC PROPERTIES OF CdTe  

E-Print Network [OSTI]

117 CRYSTAL GROWTH BY SOLVENT TECHNIQUES AND CHARACTERISTIC PROPERTIES OF CdTe T. TAGUCHI, J and holes are obtained. REVUE DE PHYSIQUE APPLIQU?E TOME 12, F?VRIER 1977, PAGE 117 1. Introduction. - CdTe during donor doping since CdTe has a strong tendency for self compensation However, in spite of a great

Paris-Sud XI, Université de

276

APPLICATIONS OF CdTe. A REVIEW Mobil Tyco Solar Energy Corporation, 16 Hickory Drive  

E-Print Network [OSTI]

APPLICATIONS OF CdTe. A REVIEW F. V. WALD Mobil Tyco Solar Energy Corporation, 16 Hickory Drive sont également données. Abstract. 2014 The review considers the history of CdTe in short form advanced. II. APPLICATIONS OF CADMIUM TELLURIDE AND DEVICES BASED ON THIS MATERIAL. Section II. 1 : CdTe

Paris-Sud XI, Université de

277

CHARACTERIZATION OF CdTe WITH PHOTOELECTRONIC TECHNIQUES A. M. MANCINI and C. MANFREDOTTI  

E-Print Network [OSTI]

255 CHARACTERIZATION OF CdTe WITH PHOTOELECTRONIC TECHNIQUES A. M. MANCINI and C. MANFREDOTTI seront discutés dans le cas où elles sont mises en 0153uvre sur CdTe. Abstract. 2014 Thermally stimulated current (TSC) and space-charge limited current (SCLC) measurements have been performed in CdTe grown

Paris-Sud XI, Université de

278

BIOTELEMETRY BASED ON CdTe-DETECTORS J. BOJSEN, N. ROSSING, O. SOEBERG and S. VADSTRUP  

E-Print Network [OSTI]

radionuclide detectors (CdTe) 2-3 mm3 (developed by C. R. N. Strasbourg) have been tested with special to the skin for surface detection [2, 3]. Among several new semiconductor materials the cadmium telluride (CdTe. - The detector probe, developed by C. R. N., Strasbourg, France, consists of a CdTe- crystal (2-3 mm

Paris-Sud XI, Université de

279

EFFECT OF BACK-CONTACT COPPER CONCENTRATION ON CdTe CELL OPERATION  

E-Print Network [OSTI]

EFFECT OF BACK-CONTACT COPPER CONCENTRATION ON CdTe CELL OPERATION A.O. Pudov, M. Gloeckler, S of Mechanical Engineering Colorado State University, Ft. Collins, CO 80523 ABSTRACT CdTe solar cells were Copper is commonly used to form low-barrier contacts to p-type CdTe absorbers. Copper, however, is a fast

Sites, James R.

280

CHARACTERIZATION OF UNDOPED HIGH RESISTIVITY CdTe GROWN BY A THM METHOD  

E-Print Network [OSTI]

185 CHARACTERIZATION OF UNDOPED HIGH RESISTIVITY CdTe GROWN BY A THM METHOD R. STUCK, J. C. MULLER techniques of cadmium tellu- ride crystals (CdTe) allowed to obtain high resistivity crystals of detector shape of the phase diagram of CdTe, it seemed interesting to characterize these materials in order

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "te grated analy" 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

Exploring the Potential for High-Quality Epitaxial CdTe Solar Cells , Ana Kanevce2  

E-Print Network [OSTI]

Exploring the Potential for High-Quality Epitaxial CdTe Solar Cells Tao Song1 , Ana Kanevce2 National Renewable Energy Laboratory, Golden, CO, 80401, USA Abstract -- Traditional polycrystalline CdTeV and ~ 20%. Epitaxial CdTe with high-quality, low defect-density, and high carrier density, could yield

Sites, James R.

282

Biaxial CdTe/CaF2 films growth on amorphous surface , F. Tang a  

E-Print Network [OSTI]

electron microscopy Metal organic chemical vapor deposition A continuous and highly biaxially textured CdTe nanorods as a buffer layer. The interface between the CdTe film and CaF2 nanorods and the morphology of the CdTe film were studied by transmission electron microscopy (TEM) and scanning electron microscopy

Wang, Gwo-Ching

283

DISSERTATION ELECTRON-REFLECTOR STRATEGY FOR CdTe THIN-FILM SOLAR CELLS  

E-Print Network [OSTI]

DISSERTATION ELECTRON-REFLECTOR STRATEGY FOR CdTe THIN-FILM SOLAR CELLS Submitted by Kuo-Jui Hsiao ELECTRON- REFLECTOR STRATEGY FOR CdTe THIN-FILM SOLAR CELLS BE ACCEPTED AS FULFILLING IN PART REQUIREMENTS SOLAR CELLS The CdTe thin-film solar cell has a large absorption coefficient and high theoretical

Sites, James R.

284

Trace formula for dielectric cavities III: TE modes  

E-Print Network [OSTI]

The construction of the semiclassical trace formula for the resonances with the transverse electric (TE) polarization for two-dimensional dielectric cavities is discussed. Special attention is given to the derivation of the two first terms of Weyl's series for the average number of such resonances. The obtained formulas agree well with numerical calculations for dielectric cavities of different shapes.

E. Bogomolny; R. Dubertrand

2012-06-15T23:59:59.000Z

285

STAFF POSITION DESCRIPTION SAN JOSE STA TE HUMAN RESOURCES  

E-Print Network [OSTI]

STAFF POSITION DESCRIPTION SAN JOSE STA TE HUMAN RESOURCES UNIVERSITY Workforce Planning l: 408-924-2250 I408-924-1784 (fax) Job Description Staff Date: Workforce Planning, Human Resources (Name [Workforce Planning reviews the CSU classification standards with essential duties of the positions] F

Su, Xiao

286

Results of a Si/CdTe Compton Telescope  

E-Print Network [OSTI]

We have been developing a semiconductor Compton telescope to explore the universe in the energy band from several tens of keV to a few MeV. We use a Si strip and CdTe pixel detector for the Compton telescope to cover an energy range from 60 keV. For energies above several hundred keV, the higher efficiency of CdTe semiconductor in comparison with Si is expected to play an important role as an absorber and a scatterer. In order to demonstrate the spectral and imaging capability of a CdTe-based Compton Telescope, we have developed a Compton telescope consisting of a stack of CdTe pixel detectors as a small scale prototype. With this prototype, we succeeded in reconstructing images and spectra by solving the Compton equation from 122 keV to 662 keV. The energy resolution (FWHM) of reconstructed spectra is 7.3 keV at 511 keV and 3.1 keV at 122 keV, respectively. The angular resolution obtained at 511 keV is measured to be 12.2 degree (FWHM).

Kousuke Oonuki; Takaaki Tanaka; Shin Watanabe; Shin'ichiro Takeda; Kazuhiro Nakazawa; Takefumi Mitani; Tadayuki Takahashi; Hiroyasu Tajima; Yasushi Fukazawa; Masaharu Nomachi

2005-09-21T23:59:59.000Z

287

Ion-beam-induced damage formation in CdTe  

SciTech Connect (OSTI)

Damage formation in <111>- and <112>-oriented CdTe single crystals irradiated at room temperature and 15 K with 270 keV Ar or 730 keV Sb ions was investigated in situ using Rutherford backscattering spectroscopy (RBS) in channeling configuration. Defect profiles were calculated from the RBS spectra using the computer code DICADA and additional energy-dependent RBS measurements were performed to identify the type of defects. At both temperatures no formation of a buried amorphous layer was detected even after prolonged irradiation with several 10{sup 16} ions/cm{sup 2}. The fact that CdTe is not rendered amorphous even at 15 K suggests that the high resistance to amorphization is caused by the high ionicity of CdTe rather than thermal effects. The calculated defect profiles show the formation of a broad defect distribution that extends much deeper into the crystal than the projected range of the implanted ions at both temperatures. The post-range defects in CdTe thus do not seem to be of thermal origin either, but are instead believed to result from migration driven by the electronic energy loss.

Rischau, C. W.; Schnohr, C. S.; Wendler, E.; Wesch, W. [Institut fuer Festkoerperphysik, Friedrich-Schiller-Universitaet Jena, Max-Wien-Platz 1, D-07743 Jena (Germany)

2011-06-01T23:59:59.000Z

288

Diffuse TeV Emission at the Galactic Centre  

E-Print Network [OSTI]

The High-Energy Stereoscopic System (HESS) has detected intense diffuse TeV emission correlated with the distribution of molecular gas along the galactic ridge at the centre of our Galaxy. Earlier HESS observations of this region had already revealed the presence of several point sources at these energies, one of them (HESS J1745-290) coincident with the supermassive black hole Sagittarius A*. It is still not entirely clear what the origin of the TeV emission is, nor even whether it is due to hadronic or leptonic interactions. It is reasonable to suppose, however, that at least for the diffuse emission, the tight correlation of the intensity distribution with the molecular gas indicates a pionic-decay process involving relativistic protons. In this paper, we explore the possible source(s) of energetic hadrons at the galactic centre, and their propagation through a turbulent medium. We conclude that though Sagittarius A* itself may be the source of cosmic rays producing the emission in HESS J1745-290, it cannot be responsible for the diffuse emission farther out. A distribution of point sources, such as pulsar wind nebulae dispersed along the galactic plane, similarly do not produce a TeV emission profile consistent with the HESS map. We conclude that only a relativistic proton distribution accelerated throughout the inter-cloud medium can account for the TeV emission profile measured with HESS.

Elizabeth Wommer; Fulvio Melia; Marco Fatuzzo

2008-04-18T23:59:59.000Z

289

TheerbInsTITuTeSectionname The Erb Institute  

E-Print Network [OSTI]

Conservation & Policy 17 Green Markets 20 Entrepreneurship 24 Corporate Sustainability & Public Policy 27 [ ]Year in Review 2012 #12;ii TheerbInsTITuTeSectionname Social Enterprise 4 Local Impact 7 Energy 10 Education 31 Climate Change & Communication 34 The Erb Institute for Global Sustainable Enterprise Erb Inst

Edwards, Paul N.

290

TeV Particle Astrophysics II: Summary comments  

E-Print Network [OSTI]

A unifying theme of this conference was the use of different approaches to understand astrophysical sources of energetic particles in the TeV range and above. In this summary I review how gamma-ray astronomy, neutrino astronomy and (to some extent) gravitational wave astronomy provide complementary avenues to understanding the origin and role of high-energy particles in energetic astrophysical sources.

Thomas K. Gaisser

2006-12-11T23:59:59.000Z

291

Carrier dynamics and activation energy of CdTe quantum dots in a Cd{sub x}Zn{sub 1-x}Te quantum well  

SciTech Connect (OSTI)

We investigate the optical properties of CdTe quantum dots (QDs) in a Cd{sub 0.3}Zn{sub 0.7}Te quantum well (QW) grown on GaAs (100) substrates. Carrier dynamics of CdTe/ZnTe QDs and quantum dots-in-a-well (DWELL) structure is studied using time-resolved photoluminescence (PL) measurements, which show the longer exciton lifetime of the DWELL structure. The activation energy of the electrons confined in the DWELL structure, as obtained from the temperature-dependent PL spectra, was also higher than that of electrons confined in the CdTe/ZnTe QDs. This behavior is attributed to the better capture of carriers into QDs within the surrounding QW.

Han, W. I.; Lee, J. H.; Yu, J. S.; Choi, J. C. [Department of Physics, Yonsei University, Wonju 220-710 (Korea, Republic of); Lee, H. S. [Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 500-712 (Korea, Republic of)

2011-12-05T23:59:59.000Z

292

Exploring Resonance Levels and Nanostructuring in the PbTe?CdTe System and Enhancement of the Thermoelectric Figure of Merit  

SciTech Connect (OSTI)

We explored the effect of Cd substitution on the thermoelectric properties of PbTe in an effort to test a theoretical hypothesis that Cd atoms on Pb sites of the rock salt lattice can increase the Seebeck coefficient via the formation of a resonance level in the density of states near the Fermi energy. We find that the solubility of Cd is less than previously reported, and CdTe precipitation occurs to create nanostructuring, which strongly suppresses the lattice thermal conductivity. We present detailed characterization including structural and spectroscopic data, transmission electron microscopy, and thermoelectric transport properties of samples of PbTe?x% CdTe?0.055% PbI{sub 2} (x = 1, 3, 5, 7, 10), PbTe?1% CdTe?y% PbI{sub 2} (y = 0.03, 0.045, 0.055, 0.08, 0.1, 0.2), PbTe?5% CdTe?y% PbI{sub 2} (y = 0.01, 0.03, 0.055, 0.08), and PbTe?1% CdTe?z% Sb (z = 0.3, 0.5, 1, 1.5, 2, 3, 4, 5, 6). All samples follow the Pisarenko relationship, and no enhancement of the Seebeck coefficient was observed that could be attributed to a resonance level or a distortion in the density of states. A maximum ZT of 1.2 at 720 K was achieved for the PbTe?1% CdTe?0.055% PbI{sub 2} sample arising from a high power factor of 17 ?W/(cm K{sup 2}) and a very low lattice thermal conductivity of 0.5 W/(m K) at 720 K.

Ahn, Kyunghan; Han, Mi-Kyung; He, Jiaqing; Androulakis, John; Ballikaya, Sedat; Uher, Ctirad; Dravid, Vinayak; Kanatzidis, Mercouri G.

2010-01-01T23:59:59.000Z

293

29th International Cosmic Ray Conference Pune (2005) 00, 101-104 TeV Observations of EGRET Unidentified Sources  

E-Print Network [OSTI]

29th International Cosmic Ray Conference Pune (2005) 00, 101-104 TeV Observations of EGRET sr), high (>90%) duty factor, TeV gamma-ray observatory is ideal for searching for TeV emission from Milagro has sufficient exposure. Of these 68 sources, 29 are within 10 degrees of the Galactic plane. Te

California at Santa Cruz, University of

294

Electrical, optical, and thermal properties of Sn-doped phase change material Ge2Sb2Te5  

Science Journals Connector (OSTI)

In this article, effect of Sn on the electrical, optical, and thermal properties of Ge2Sb2Te5 is studied. Ge2Sb2Te5, Ge1.55Sb2Te5Sn0.45, and Ge1.1Sb2Te5Sn0.9...alloys are prepared by melt quenching technique and ...

Gurinder Singh; Aman Kaura; Monika Mukul; S. K. Tripathi

2013-01-01T23:59:59.000Z

295

High efficiency photodetectors fabricated by electrostatic layer-by-layer self-assembly of CdTe quantum dots  

E-Print Network [OSTI]

High efficiency photodetectors fabricated by electrostatic layer-by-layer self-assembly of CdTe 20 October 2008 We demonstrate high-performance photodetectors from multilayers of CdTe quantum dots. The synthesis of CdTe QDs in aqueous solution using cadmium perchlorate hydrate and Al2Te3 was previously re

Lin, Lih Y.

296

ROLE OF COPPER IN THE PERFORMANCE OF CdS/CdTe SOLAR CELLS * , D. Albin2  

E-Print Network [OSTI]

simulations to reproduce and explain some of the experimental results. Introduction The performance of CdTe Cucd in CdTe [1,2]. Cu can also migrate along grain boundaries toward the main junction. The standard with a relatively simpler one in which Cu metal of varying thickness is evaporated on Te-rich CdTe surfaces

Sites, James R.

297

1. INTRODUCTION CdTe/CdS is one of the most promising solar cell for low  

E-Print Network [OSTI]

with CdTe grown by close space sublimation, electrodeposition, spray pyrolysis, vacuum evaporation and RF conversion of CdTe layers, as well as for the intermixing of CdS-CdTe. An optimum annealing condition is required for the formation of an appropriate CdTe1-x-Sx intermixed interface. It is desirable to separately

Romeo, Alessandro

298

Conformal growth of Mo/Si multilayers on grating substrates using collimated ion beam sputtering  

SciTech Connect (OSTI)

Deposition of multilayers on saw-tooth substrates is a key step in the fabrication of multilayer blazed gratings (MBG) for extreme ultraviolet and soft x-rays. Growth of the multilayers can be perturbed by shadowing effects caused by the highly corrugated surface of the substrates, which results in distortion of the multilayer stack structure and degradation of performance of MBGs. To minimize the shadowing effects we used an ionbeam sputtering machine with a highly collimated atomic flux to deposit Mo/Si multilayers on saw-tooth substrates. The sputtering conditions were optimized by finding a balance between smoothening and roughening processes in order to minimize degradation of the groove profile in the course of deposition and at the same time to keep the interfaces of a multilayer stack smooth enough for high efficiency. An optimal value of energy of 200 eV for sputtering Kr{sup +} ions was found by deposition of test multilayers on flat substrates at a range of ion energies. Two saw-tooth substrates were deposited at energies of 200 eV and 700 eV for the sputtering ions. It was found that reduction of the ion energy improved the blazing performance of the MBG and resulted in a 40% gain in the diffraction efficiency due to better replication of the groove profile by the multilayer. As a result of the optimization performed, an absolute diffraction efficiency of 28.8% was achieved for the 2nd blaze order of the MBG with a groove density of 7350 lines/mm at a wavelength of 13.5 nm. Details of the growth behavior of the multilayers on flat and saw-tooth substrates are discussed in terms of the Linear Continuous Model of film growth.

Gawlitza, Peter; Cambie, Rossana; Dhuey, Scott; Gullikson, Eric; Warwick, Tony; Braun, Stefan; Yashchuk, Valeriy; Padmore, Howard

2012-01-23T23:59:59.000Z

299

Variable Spaced Grating (VSG) Snout, Rotator and Rails for use at LLE  

SciTech Connect (OSTI)

The Variable Spaced Grating (VSG) is a spectrometer snout mounted to an X-Ray Framing Camera (XRFC) through the Unimount flange. This equipment already exists and is used at the University of Rochester, Laboratory for Laser Energetics (LLE) facility. The XRFC and the Unimount flange are designed by LLE. The Tilt Rotator fixture that mounts next to the XRFC and the cart rails are designed by LLNL, and are included in this safety note. The other related components, such as the TIM rails and the Unimount flange, are addressed in a separate safety note, EDSN09-500005-AA. The Multipurpose Spectrometer (MSPEC) and VSG are mounted on the TIM Boat through the cart rails that are very similar in design. The tilt rotator combination with the Unimount flange is also a standard mounting procedure. The later mounting system has been included in this safety note. Figure-1 shows the interface components and the VSG snout. Figure-2 shows the VSG assembly mounted on the Unimount flange. The calibration pointer attachment is shown in place of the snout. There are two types of VSG, one made of 6061-T6 aluminum, weighing approximately 3 pounds, and the other made of 304 stainless steel, weighing approximately 5.5 pounds. This safety note examines the VSG steel design. Specific experiments may require orienting the VSG snout in 90 degrees increment with respect to the Unimount flange. This is done by changing the bolts position on the VSG-main body adapter flange to the Unimount adapter plate. There is no hazard involved in handling the VSG during this procedure as it is done outside the target chamber on the cart rail before installing on the TIM. This safety note addresses the mechanical integrity of the VSG structure, the tilt rotating fixture, the cart rails with handle and their connections. Safety Factors are also calculated for the MSPEC in place of the VSG.

Mukherjee, S K; Emig, J A; Griffith, L V; Heeter, R F; House, F A; James, D L; Schneider, M B; Sorce, C M

2010-01-25T23:59:59.000Z

300

High Efficiency CdTe/CdS Thin Film Solar Cells Prepared by Treating CdTe Films with a Freon Gas in Substitution of CdCl2  

E-Print Network [OSTI]

High Efficiency CdTe/CdS Thin Film Solar Cells Prepared by Treating CdTe Films with a Freon Gas delle Scienze, 37/A-43010 Fontanini, Parma, Italy ABSTRACT: CdTe/CdS thin film solar cells have reached in the preparation of high efficiency CdTe/CdS solar cells is the activation treatment of CdTe film. Most research

Romeo, Alessandro

Note: This page contains sample records for the topic "te grated analy" 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

Charge transport properties of CdMnTe radiation detectors  

SciTech Connect (OSTI)

Growth, fabrication and characterization of indium-doped cadmium manganese telluride (CdMnTe)radiation detectors have been described. Alpha-particle spectroscopy measurements and time resolved current transient measurements have yielded an average charge collection efficiency approaching 100 %. Spatially resolved charge collection efficiency maps have been produced for a range of detector bias voltages. Inhomogeneities in the charge transport of the CdMnTe crystals have been associated with chains of tellurium inclusions within the detector bulk. Further, it has been shown that the role of tellurium inclusions in degrading chargecollection is reduced with increasing values of bias voltage. The electron transit time was determined from time of flight measurements. From the dependence of drift velocity on applied electric field the electron mobility was found to be n = (718 55) cm2/Vs at room temperature.

Kim K.; Rafiel, R.; Boardman, M.; Reinhard, I.; Sarbutt, A.; Watt, G.; Watt, C.; Uxa, S.; Prokopovich, D.A.; Belas, E.; Bolotnikov, A.E.; James, R.B.

2012-04-11T23:59:59.000Z

302

Characterization of isothermal vapor phase epitaxial (Hg,Cd)Te  

Science Journals Connector (OSTI)

We report on the characterization of mercury cadmium telluride (Hg 1?x Cd x Te) film grown by the isothermal vapor phase epitaxial method (ISOVPE) and on the surface conversion of bulk Hg 1?xCd x Te to larger bandgap material. The crystal perfection is evaluated using defect etching electron beam and electrolyte electroreflectance (EBER and EER) and Rutherford backscattering spectrometry (RBS). Hall measurements are used to measure carrier densities and mobilities. Surface concentrations and concentration profiles are measured for the ISOVPE grown layers by transmission Fourier transform infrared spectroscopy (FTIR) and electron?probe microanalysis (EPMA) to establish quantitative informations about composition control. Metalinsulator?semiconductor (MIS) structures were made and the properties important to device performance such as compositional uniformity storage time and carrier concentration are measured. The ISOVPE layers are compared in quality to films grown by other methods and show promise for MIS devices.

S. B. Lee; L. K. Magel; M. F. S. Tang; D. A. Stevenson; J. H. Tregilgas; M. W. Goodwin; R. L. Strong

1990-01-01T23:59:59.000Z

303

Point Defect Characterization in CdZnTe  

SciTech Connect (OSTI)

Measurements of the defect levels and performance testing of CdZnTe detectors were performed by means of Current Deep Level Transient Spectroscopy (I-DLTS), Transient Charge Technique (TCT), Current versus Voltage measurements (I-V), and gamma-ray spectroscopy. CdZnTe crystals were acquired from different commercial vendors and characterized for their point defects. I-DLTS studies included measurements of defect parameters such as energy levels in the band gap, carrier capture cross sections, and defect densities. The induced current due to laser-generated carriers was measured using TCT. The data were used to determine the transport properties of the detectors under study. A good correlation was found between the point defects in the detectors and their performance.

Gul,R.; Li, Z.; Bolotnikov, A.; Keeter, K.; Rodriguez, R.; James, R.

2009-03-24T23:59:59.000Z

304

MHK Projects/TE4 | Open Energy Information  

Open Energy Info (EERE)

TE4 TE4 < MHK Projects Jump to: navigation, search << Return to the MHK database homepage Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"350px","centre":false,"title":"","label":"","icon":"File:Aquamarine-marker.png","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":52.3247,"lon":1.68765,"alt":0,"address":"","icon":"http:\/\/prod-http-80-800498448.us-east-1.elb.amazonaws.com\/w\/images\/7\/74\/Aquamarine-marker.png","group":"","inlineLabel":"","visitedicon":""}]}

305

RARE B MESON DECAYS T.E. Browder \\Lambda  

E-Print Network [OSTI]

Supported by the US Department of Energy c fl 2002 by T.E. Browder #12; 1 Introduction, Motivation on the construction of the Standard Model of particle physics. Recall that in a physical picture with only three. As a result, the weak neutral current, J 0 NC , J 0 NC = u¯u + d c ¯ d c + s c ¯ s c (2) = u¯u + d ¯ d cos 2

Browder, Tom

306

Photoluminescence upconversion in colloidal CdTe quantum dots  

Science Journals Connector (OSTI)

Efficient photoluminescence (PL) up-conversion has been observed in colloidal CdTe quantum dots with an energy gain of as high as 360 meV. Compared with the normal PL, the peak energy of this up-converted PL (UCPL) shows a redshift of about 80 meV, and the corresponding radiative lifetime becomes nearly twice as long. This UCPL is attributed to the carrier recombination involving surface states mainly through a thermal excitation process.

Xiaoyong Wang; W. William Yu; Jiayu Zhang; Jose Aldana; Xiaogang Peng; Min Xiao

2003-09-22T23:59:59.000Z

307

Mr. John E. Kieling, Chief Hazardous Was te Bureau  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

John E. Kieling, Chief John E. Kieling, Chief Hazardous Was te Bureau Depa rtment of Energy Carlsbad Field Office P. O. Box 3090 Carlsbad , New Mexico 88221 NOV 0 5 2013 New Mexico Environment Department 2905 Rodeo Park Drive East. Building 1 Santa Fe, New Mexico 87505-6303 Subject: Panel 6 Closure and Final Waste Emplacement Notifications Dear Mr. Kieling : The purpose of this leiter is 1 0 notify th e New Mexico Environment Department (NMEO) that the

308

Density functional simulations of phase change materials: disordered phases of Ge8Sb2Te11 and Ag/In/Sb/Te alloys  

E-Print Network [OSTI]

E*PCOS2009 Density functional simulations of phase change materials: disordered phases of Ge8Sb2Te75.0Te17.7 (AIST). These represent two families used widely as phase change materials: pseudobinary and more flexible than those of Ag. Key words: Phase change materials, density functional calculations

309

ELUTIONS Inc formerly TeCom | Open Energy Information  

Open Energy Info (EERE)

ELUTIONS Inc formerly TeCom ELUTIONS Inc formerly TeCom Jump to: navigation, search Name ELUTIONS Inc (formerly TeCom) Place Tampa, Florida Zip 33605 Sector Efficiency Product Tampa-based wireless enterprise automation solutions firm. Elutions provides an Active Energy Management service allowing users to increase efficiency by monitoring, forecasting and analyzing utility resource consumption. Coordinates 27.94653°, -82.459269° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":27.94653,"lon":-82.459269,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

310

A New Limit on the Neutrinoless DBD of 130Te  

E-Print Network [OSTI]

We report the present results of CUORICINO a cryogenic experiment on neutrinoless double beta decay (DBD) of 130Te consisting of an array of 62 crystals of TeO2 with a total active mass of 40.7 kg. The array is framed inside of a dilution refrigerator, heavily shielded against environmental radioactivity and high-energy neutrons, and operated at a temperature of ~8 mK in the Gran Sasso Underground Laboratory. Temperature pulses induced by particle interacting in the crystals are recorded and measured by means of Neutron Transmutation Doped thermistors. The gain of each bolometer is stabilized with voltage pulses developed by a high stability pulse generator across heater resistors put in thermal contact with the absorber. The calibration is performed by means of two thoriated wires routinely inserted in the set-up. No evidence for a peak indicating neutrinoless DBD of 130Te is detected and a 90% C.L. lower limit of 1.8E24 years is set for the lifetime of this process. Taking largely into account the uncertainties in the theoretical values of nuclear matrix elements, this implies an upper boud on the effective mass of the electron neutrino ranging from 0.2 to 1.1 eV. This sensitivity is similar to those of the 76Ge experiments.

C. Arnaboldi; D. R. Artusa; F. T. Avignone III; M. Balata; I. Bandac; M. Barucci; J. W. Beeman; C. Brofferio; C. Bucci; S. Capelli; L. Carbone; S. Cebrian; O. Cremonesi; R. J. Creswick; A. de Waard; H. A. Farach; E. Fiorini; G. Frossati; E. Guardincerri; A. Giuliani; P. Gorla; E. E. Haller; J. McDonald; E. B. Norman; A. Nucciotti; E. Olivieri; M. Pallavicini; E. Palmieri; E. Pasca; M. Pavan; M. Pedretti; G. Pessina; S. Pirro; E. Previtali; L. Risegari; C. Rosenfeld; S. Sangiorgio; M. Sisti; A. R. Smith; L. Torres; G. Ventura

2005-01-13T23:59:59.000Z

311

A grating-based single-shot x-ray phase contrast and diffraction method for in vivo imaging  

SciTech Connect (OSTI)

Purpose: The purpose of this study is to develop a single-shot version of the grating-based phase contrast x-ray imaging method and demonstrate its capability of in vivo animal imaging. Here, the authors describe the principle and experimental results. They show the source of artifacts in the phase contrast signal and optimal designs that minimize them. They also discuss its current limitations and ways to overcome them. Methods: A single lead grid was inserted midway between an x-ray tube and an x-ray camera in the planar radiography setting. The grid acted as a transmission grating and cast periodic dark fringes on the camera. The camera had sufficient spatial resolution to resolve the fringes. Refraction and diffraction in the imaged object manifested as position shifts and amplitude attenuation of the fringes, respectively. In order to quantify these changes precisely without imposing a fixed geometric relationship between the camera pixel array and the fringes, a spatial harmonic method in the Fourier domain was developed. The level of the differential phase (refraction) contrast as a function of hardware specifications and device geometry was derived and used to guide the optimal placement of the grid and object. Both ex vivo and in vivo images of rodent extremities were collected to demonstrate the capability of the method. The exposure time using a 50 W tube was 28 s. Results: Differential phase contrast images of glass beads acquired at various grid and object positions confirmed theoretical predictions of how phase contrast and extraneous artifacts vary with the device geometry. In anesthetized rats, a single exposure yielded artifact-free images of absorption, differential phase contrast, and diffraction. Differential phase contrast was strongest at bone-soft tissue interfaces, while diffraction was strongest in bone. Conclusions: The spatial harmonic method allowed us to obtain absorption, differential phase contrast, and diffraction images, all from a single raw image and is feasible in live animals. Because the sensitivity of the method scales with the density of the gratings, custom microfabricated gratings should be superior to off-the-shelf lead grids.

Bennett, Eric E.; Kopace, Rael; Stein, Ashley F.; Wen Han [National Heart, Lung, and Blood Institute, National Institutes of Health, Imaging Physics Section, Translational Medicine Branch, 10 Center Drive, MSC 1061, Bethesda, Maryland 20892 (United States)

2010-11-15T23:59:59.000Z

312

Optimized Si/SiO2 high contrast grating mirror design for mid-infrared wavelength range: robustness enhancement  

E-Print Network [OSTI]

A high reflectivity and polarization selective high contrast grating mirror has been designed with the use of an automated optimization algorithm. Through a precise study of the tolerance of the different lengths of the structure, the robustness with respect to the fabrication errors has been enhanced to high tolerance values between 5 % and 210 %. This adjustment of the dimensions of the structure leads to a 250 nm large bandwidth mirror well adapted for a VCSEL application at \\lambda = 2.65 $\\mu$m and can easily be scaled for other wavelengths.

Chevallier, Christyves; Jacquet, Joel; Fressengeas, Nicolas; 10.1016/j.optlastec.2011.09.010

2011-01-01T23:59:59.000Z

313

Electronic and thermal transport in GeTe: A versatile base for thermoelectric materials  

SciTech Connect (OSTI)

GeTe is a narrow-band gap semiconductor, where Ge vacancies generate free charge carriers, holes, forming a self-dopant degenerate system with p-type conductivity, and serves as a base for high-performance multicomponent thermoelectric materials. There is a significant discrepancy between the electronic and thermal transport data for GeTe-based materials reported in the literature, which obscures the baseline knowledge and prevents a clear understanding of the effect of alloying GeTe with various elements. A comprehensive study including XRD, SEM, EDS, Seebeck coefficient, electrical resistivity, thermal conductivity, and 125Te NMR of several GeTe samples was conducted. Similar Seebeck coefficient and electrical resistivity are observed for all GeTe samples used showing that the concentration of Ge vacancies generating charge carriers is constant along the ingot. Very short 125Te NMR spin-relaxation time agrees well with high carrier concentration obtained from the Hall effect measurements. Our data show that at ~700 K, GeTe has a very large power factor, 42 ?Wcm-1K-2, much larger than that of any high efficiency thermoelectric telluride at these temperatures. Electronic and thermal properties of GeTe are compared to PbTe, another well-known thermoelectric material, where free charge carriers, holes or electrons, are generated by vacancies on Pb or Te sites, respectively. Discrepancy in the data for GeTe reported in literature can be attributed to the variation in the Ge:Te ratio of solidified samples as well as to different conditions of measurements.

None

2013-08-29T23:59:59.000Z

314

Electronic and thermal transport in GeTe: A versatile base for thermoelectric materials  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

GeTe is a narrow-band gap semiconductor, where Ge vacancies generate free charge carriers, holes, forming a self-dopant degenerate system with p-type conductivity, and serves as a base for high-performance multicomponent thermoelectric materials. There is a significant discrepancy between the electronic and thermal transport data for GeTe-based materials reported in the literature, which obscures the baseline knowledge and prevents a clear understanding of the effect of alloying GeTe with various elements. A comprehensive study including XRD, SEM, EDS, Seebeck coefficient, electrical resistivity, thermal conductivity, and 125Te NMR of several GeTe samples was conducted. Similar Seebeck coefficient and electrical resistivity are observed for all GeTe samples used showing that the concentration of Ge vacancies generating charge carriers is constant along the ingot. Very short 125Te NMR spin-relaxation time agrees well with high carrier concentration obtained from the Hall effect measurements. Our data show that at ~700 K, GeTe has a very large power factor, 42 ?Wcm-1K-2, much larger than that of any high efficiency thermoelectric telluride at these temperatures. Electronic and thermal properties of GeTe are compared to PbTe, another well-known thermoelectric material, where free charge carriers, holes or electrons, are generated by vacancies on Pb or Te sites, respectively. Discrepancy in the data for GeTe reported in literature can be attributed to the variation in the Ge:Te ratio of solidified samples as well as to different conditions of measurements.

None

2013-08-29T23:59:59.000Z

315

Development of ZnTe:Cu Contacts for CdTe Solar Cells: Cooperative Research and Development Final Report, CRADA Number CRD-08-320  

SciTech Connect (OSTI)

The main focus of the work at NREL was on the development of Cu-doped ZnTe contacts to CdTe solar cells in the substrate configuration. The work performed under the CRADA utilized the substrate device structure used at NREL previously. All fabrication was performed at NREL. We worked on the development of Cu-doped ZnTe as well as variety of other contacts such as Sb-doped ZnTe, CuxTe, and MoSe2. We were able to optimize the contacts to improve device parameters. The improvement was obtained primarily through increasing the open-circuit voltage, to values as high as 760 mV, leading to device efficiencies of 7%.

Dhere, R.

2012-04-01T23:59:59.000Z

316

GNOSIS: THE FIRST INSTRUMENT TO USE FIBER BRAGG GRATINGS FOR OH SUPPRESSION  

SciTech Connect (OSTI)

The near-infrared is an important part of the spectrum in astronomy, especially in cosmology because the light from objects in the early universe is redshifted to these wavelengths. However, deep near-infrared observations are extremely difficult to make from ground-based telescopes due to the bright background from the atmosphere. Nearly all of this background comes from the bright and narrow emission lines of atmospheric hydroxyl (OH) molecules. The atmospheric background cannot be easily removed from data because the brightness fluctuates unpredictably on short timescales. The sensitivity of ground-based optical astronomy far exceeds that of near-infrared astronomy because of this long-standing problem. GNOSIS is a prototype astrophotonic instrument that utilizes 'OH suppression fibers' consisting of fiber Bragg gratings and photonic lanterns to suppress the 103 brightest atmospheric emission doublets between 1.47 and 1.7 {mu}m. GNOSIS was commissioned at the 3.9 m Anglo-Australian Telescope with the IRIS2 spectrograph to demonstrate the potential of OH suppression fibers, but may be potentially used with any telescope and spectrograph combination. Unlike previous atmospheric suppression techniques GNOSIS suppresses the lines before dispersion and in a manner that depends purely on wavelength. We present the instrument design and report the results of laboratory and on-sky tests from commissioning. While these tests demonstrated high throughput ( Almost-Equal-To 60%) and excellent suppression of the skylines by the OH suppression fibers, surprisingly GNOSIS produced no significant reduction in the interline background and the sensitivity of GNOSIS+IRIS2 is about the same as IRIS2. It is unclear whether the lack of reduction in the interline background is due to physical sources or systematic errors as the observations are detector noise dominated. OH suppression fibers could potentially impact ground-based astronomy at the level of adaptive optics or greater. However, until a clear reduction in the interline background and the corresponding increasing in sensitivity is demonstrated optimized OH suppression fibers paired with a fiber-fed spectrograph will at least provide a real benefit at low resolving powers.

Trinh, Christopher Q.; Ellis, Simon C.; Bland-Hawthorn, Joss; Bryant, Julia; O'Byrne, John [Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006 (Australia); Lawrence, Jon S.; Horton, Anthony J.; Shortridge, Keith; Case, Scott; Colless, Matthew; Gers, Luke; Lee, Steve; Miziarski, Stan [Australian Astronomical Observatory, 105 Delhi Road, North Ryde, P.O. Box 915, NSW 1670 (Australia); Leon-Saval, Sergio G. [Institute of Photonics and Optical Science, School of Physics, University of Sydney, NSW 2006 (Australia); Couch, Warrick; Glazebrook, Karl [Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122 (Australia); Freeman, Kenneth [Research School of Astronomy and Astrophysics, Australian National University, Weston Creek, ACT 2611 (Australia); Loehmannsroeben, Hans-Gerd [innoFSPEC-Institut fuer Chemie/Physikalische Chemie, Universitaet Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm (Germany); Haynes, Roger; Roth, Martin M., E-mail: c.trinh@physics.usyd.edu.au [innoFSPEC-Leibniz-Institut fuer Astrophysik Potsdam, An der Sternwarte 16, D-14482 Potsdam (Germany); and others

2013-02-01T23:59:59.000Z

317

Development of pseudo-random binary gratings and arrays for calibration of surface profile metrology tools  

SciTech Connect (OSTI)

Optical Metrology tools, especially for short wavelength (EUV and X-Ray), must cover a wide range of spatial frequencies from the very low, which affects figure, to the important mid-spatial frequencies and the high spatial frequency range, which produces undesirable flair. A major difficulty in using surface profilometers arises due to the unknown Modulation Transfer Function (MTF) of the instruments. Therefore, accurate calibration of profilometers, the understanding of their MTF limitations, and cross calibration between tools represents a considerable challenge for quantitative optical metrology. In previous work the instrumental MTF of a surface profiler was precisely measured using reference test surfaces based on binary pseudo-random (BPR) gratings. Here, they present results of fabricating and using two-dimensional (2D) BPR arrays that allow for a direct 2D calibration of the instrumental MTF. BPR sequences are widely used in engineering and communication applications such as Global Position System, and wireless communication protocol. The ideal BPR pattern has a flat 'white noise' response over the entire range of spatial frequencies of interest. The BPR array used here is based on the Uniformly Redundant Array prescription initially used for x-ray and gamma ray astronomy applications. The URA's superior imaging capability originates from the fact that its cyclical autocorrelation function very closely approximates a delta function, which produces a flat Power Spectrum Density (PSD). Three different BPR array patterns were fabricated by electron beam lithography and ICP etching of silicon. The basic size unit was 200 nm, 400 nm, and 600 nm. Figure 1 shows the fabrication sequence. The 2D BPR arrays were used as standard test surfaces for MTF calibration of the MicroMap{trademark}-570 interferometric microscope with all available objectives. Figure 2 shows representative scanning probe height data for the 400 nm BPR sample. Figure 2 shows the raw Power Spectral Density for 5 different objectives. They demonstrate that the two dimensional BPR array is a very effective calibration standard. However, departures from ideal, such as square sidewall, and uniform etch depth ultimately can limit the accuracy of the calibration. The effects of fabrication imperfections on the efficiency of calibration will be discussed.

Barber, Samuel K.; Soldate, Paul; Anderson, Erik; Cambie, Rosanna; McKinney, Wayne R.; Takacs, Peter Z.; Voronov, Dmytro L.; Yashchuk, Valeriy V.

2009-01-16T23:59:59.000Z

318

First-Principles Study of Back Contact Effects on CdTe Thin Film Solar Cells  

SciTech Connect (OSTI)

Forming a chemically stable low-resistance back contact for CdTe thin-film solar cells is critically important to the cell performance. This paper reports theoretical study of the effects of the back-contact material, Sb{sub 2}Te{sub 3}, on the performance of the CdTe solar cells. First-principles calculations show that Sb impurities in p-type CdTe are donors and can diffuse with low diffusion barrier. There properties are clearly detrimental to the solar-cell performance. The Sb segregation into the grain boundaries may be required to explain the good efficiencies for the CdTe solar cells with Sb{sub 2}Te{sub 3} back contacts.

Du, Mao-Hua [ORNL

2009-01-01T23:59:59.000Z

319

Multi-TeV flaring from blazars: Markarian 421 a case study  

E-Print Network [OSTI]

The TeV blazar Markarian 421 underwent multi-TeV flaring during April 2004 and simultaneously observed in x-ray and TeV energies. It was observed that the TeV outbursts had no counterparts in the lower energies, which implies that this might be an orphan flare. In the context of hadronic model, we have shown that this multi-TeV flaring can be produced due to the interaction of Fermi-accelerated protons of energy $\\lesssim 168$ TeV with the background photons in the low energy tail of the synchrotron self-Compton spectrum of the blazar jet. We fit very well the flaring spectrum with this model. Based on this study, we speculate that Mrk 501 and PG 1553+113 are possible candidates for orphan flaring in the future.

Sahu, Sarira; Rajpoot, Subhash

2015-01-01T23:59:59.000Z

320

The Effect of Structural Vacancies on the Thermoelectric Properties of (Cu2Te)1-x(Ga2Te3)x  

SciTech Connect (OSTI)

We have studied the effects of structural vacancies on the thermoelectric properties of the ternary compounds (Cu2Te)1-x(Ga2Te3)x (x = 0.5, 0.55, 0.571, 0.6, 0.625, 0.667 and 0.75), which are solid solutions found in the pseudo-binary phase diagram for Cu2Te and Ga2Te3. This system possesses tunable structural vacancy concentrations. The x= 0.5 phase, CuGaTe2, is nominally devoid of structural vacancies, while the rest of the compounds contain varying amounts of these features, and the volume density of vacancies increases with Ga2Te3 content. The sample with x = 0.5, 0.55, 0.571, 0.6, 0.625 crystallize in the chalcopyrite structure while the x = 0.667 and 0.75 adopt the Ga2Te3 defect zinc blende structure. Strong scattering of heat carrying phonons by structural defects, leads to the reduction of thermal conductivity, which is beneficial to the thermoelectric performance of materials. On the other hand, these defects also scatter charge carriers and reduce the electrical conductivity. All the samples investigated are p-type semiconductors as inferred by the signs of their respective Hall (RH) and Seebeck (S) coefficients. The structural vacancies were found to scatter phonons strongly, while a combination of increased carrier concentration, and vacancies decreases the Hall mobility ( H), degrading the overall thermoelectric performance. The room temperature H drops from 90 cm2/V s for CuGaTe2 to 13 cm2/V s in Cu9Ga11Te21 and 4.6 cm2/V s in CuGa3Te5. The low temperature thermal conductivity decreases significantly with higher Ga2Te3 concentrations (higher vacancy concentration) due to increased point defect scattering which dominate thermal resistance terms. At high temperatures, the dependence of thermal conductivity on the Ga2Te3 content is less significant. The presence of strong Umklapp scattering leads to low thermal conductivity at high temperatures for all samples investigated. The highest ZT among the samples in this study was found for the defect-free CuGaTe2 with ZT ~ 1.0 at 840K.

Ye, Zuxin [GM Research and Development Center; Cho, Jung Y [GM R& D and Planning, Warren, Michigan; Tessema, Misle [GM Research and Development Center; Salvador, James R. [GM R& D and Planning, Warren, Michigan; Waldo, Richard [GM R& D and Planning, Warren, Michigan; Wang, Hsin [ORNL; Cai, Wei [ORNL

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
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321

2D grating simulation for X-ray phase-contrast and dark-field imaging with a Talbot interferometer  

SciTech Connect (OSTI)

Talbot interferometry is a recently developed and an extremely powerful X-ray phase-contrast imaging technique. Besides giving access to ultra-high sensitivity differential phase contrast images, it also provides the dark field image, which is a map of the scattering power of the sample. In this paper we investigate the potentialities of an improved version of the interferometer, in which two dimensional gratings are used instead of standard line grids. This approach allows to overcome the difficulties that might be encountered in the images produced by a one dimensional interferometer. Among these limitations there are the phase wrapping and quantitative phase retrieval problems and the directionality of the differential phase and dark-field signals. The feasibility of the 2D Talbot interferometer has been studied with a numerical simulation on the performances of its optical components under different circumstances. The gratings can be obtained either by an ad hoc fabrication of the 2D structures or by a superposition of two perpendicular linear grids. Through this simulation it has been possible to find the best parameters for a practical implementation of the 2D Talbot interferometer.

Zanette, Irene; Weitkamp, Timm [European Synchrotron Radiation Facility, 6 rue Jules Horowitz, 38043 Grenoble (France); David, Christian; Rutishauser, Simon [Paul Scherrer Insitute, 5232 Villigen PSI (Switzerland)

2010-04-06T23:59:59.000Z

322

DETERMINATION AND CHARACTERIZATION OF DEEP LEVELS IN p-CdTe(Cl)  

E-Print Network [OSTI]

photons de 122 keV (57Co) et de 5 keV pour des photons de 59 keV (241Am). Abstract. 2014 CdTe single doped CdTe single crystals grown from tellurium solvent have a good resolution for gamma-rays, when. The investigation of the energy levels system of charged centres in CdTe, as well as in other II-VI compounds

Paris-Sud XI, Université de

323

ELECTRIC PROPERTIES OF SEMI-INSULATING CRYSTALS CdTe : Cl  

E-Print Network [OSTI]

239 ELECTRIC PROPERTIES OF SEMI-INSULATING CRYSTALS CdTe : Cl E. N. ARKADYEVA and O. A. MATVEEV A Des mesures d'effet Hall et de conductivité sont effectuées sur des cristaux de CdTe, dopé au chlore and conductivity measurement are carried out on chlorine doped semi- insulating CdTe crystals, of p and n electric

Boyer, Edmond

324

Voltage Dependent Carrier Collection in CdTe Solar Cells D.L. Btzner1  

E-Print Network [OSTI]

Voltage Dependent Carrier Collection in CdTe Solar Cells D.L. Bätzner1 , Guido Agostinelli2 , A to 1000nm, i.e. the band edge region of CdTe. Region I is further divided in a `blue' part between 300 nm III is as well subdivided in region IIIa from about 800 nm to the band gap of CdTe (~850 nm

Romeo, Alessandro

325

CdTe OPTICAL WAVEGUIDE MODULATORS (*) D. L. SPEARS and A. J. STRAUSS  

E-Print Network [OSTI]

401 CdTe OPTICAL WAVEGUIDE MODULATORS (*) D. L. SPEARS and A. J. STRAUSS Lincoln Laboratory guides d'ondes opto-acoustiques et opto-électriques ont été réalisés dans des guides d'ondes n-/n+ CdTe-électriques de faible tension ont été réalisés en appliquant des électrodes en or sur des plaquettes n+ de CdTe

Paris-Sud XI, Université de

326

ELECTROABSORPTION BY IMPURITIES AND DEFECTS IN SEMI-INSULATING CdTe  

E-Print Network [OSTI]

263 ELECTROABSORPTION BY IMPURITIES AND DEFECTS IN SEMI-INSULATING CdTe G. NEU, Y. MARFAING, R des défauts dans CdTe compensé non dopé et dopé au chlore de 1,2 à 1,6 eV. Trois groupes de symétrie. Abstract. 2014 Electroabsorption experiments have been conducted on semi-insulating CdTe prepared

Paris-Sud XI, Université de

327

CdTe-Cu(OH){sub 2} nanocomposite: Aqueous synthesis and characterization  

SciTech Connect (OSTI)

CdTe-Cu(OH){sub 2} nanocomposites were synthesized in aqueous solution by a seed-mediated growth approach. The effect of refluxing time and the concentration of Cu{sup 2+} on the preparation of these samples were measured using UV-visible absorption and photoluminescence analysis. The emission peak of the synthesized nanocomposites (CdTe-Cu(OH){sub 2}) was shifted from 605 (CdTe seed) to 621 nm. The size of CdTe nanoparticles were averaged about 3.22 nm, and the CdTe-Cu(OH){sub 2} nanocomposites were averaged as 5.19 nm. The synthesized CdTe-Cu(OH){sub 2} nanocomposite were characterized with XRD, EDAX, TEM, FT-IR, EPR, and thermal analysis (TG/DTG curves). The results indicate that as-prepared nanoparticles with core/shell structure exhibit interesting optical properties. -- Graphical Abstract: Schematic of aqueous synthesis route for CdTe-Cu(OH){sub 2} nanocomposite and The Stokes shift of CdTe nanocrystals and CdTe-Cu(OH){sub 2} Nanocomposites, (CdTe: emission at 605 nm, CdTe-Cu(OH){sub 2}: emission at 621 nm). Display Omitted Highlights: {yields} CdTe-Cu(OH){sub 2} nanocomposites were synthesized by a seed-mediated growth approach. {yields} The synthetic procedure is simple, and can be easily scaled up. {yields} The effect of refluxing time on the preparation of these samples was measured. {yields} The Cu(OH){sub 2} shell thickness was controlled by the amount of Cu in the solution. {yields} TEM images demonstrated homogeneous size distribution for these nanocomposites.

Abd El-sadek, M.S., E-mail: el_sadek_99@yahoo.co [Nanomaterial Laboratory, Physics Department, Faculty of Science, South Valley University, Qena 83523 (Egypt); Crystal Growth Centre, Anna University Chennai, Chennai 600025 (India); Moorthy Babu, S. [Crystal Growth Centre, Anna University Chennai, Chennai 600025 (India)

2011-05-15T23:59:59.000Z

328

DISSERTATION Role of the Cu-O Defect in CdTe Solar Cells  

E-Print Network [OSTI]

OF THE CU-O DEFECT COMPLEX IN CDTE SOLAR CELLS Thin-film CdTe is one of the leading materials used the defects present in thin-film CdTe deposited for solar cells. One key defect seen in the thin-film CdDISSERTATION Role of the Cu-O Defect in CdTe Solar Cells Submitted by Caroline R. Corwine

Sites, James R.

329

Superficies y Vacio 8, 69-72(1999) Sociedad Mexicana de Ciencias de Superficies y de Vaco. Electronic properties of (CdTe)x(In2Te3)1-x thin films grown by close spaced vapor  

E-Print Network [OSTI]

(CSVT-FE); CdTe and In2Te3 were employed as sources. The temperature of evaporation of the CdTe and In2 the band gap energy from a value as low as 0.6 eV up to 1.5 eV, the band gap of CdTe. It has been reported I. INTRODUCTION The ternary compound CdIn2Te4 is of interest since all compounds formed by mixing CdTe

Meléndez Lira, Miguel Angel

330

Electrical properties of PbTe single crystals with excess tellurium  

SciTech Connect (OSTI)

The effects of excess (up to 0.1 at %) Te atoms and heat treatment at 473 and 573 K for 120 h on the conductivity {sigma}, thermopower {alpha}, and Hall coefficient R of PbTe single crystals are studied. It is shown that excess Te atoms and annealing strongly affect the values and character of the temperature dependences of these parameters and the signs of {alpha} and R at low temperatures, which is caused by the acceptor effect of these atoms and the formation of antisite defects due to localization of Te in vacancies of the lead sublattice upon annealing.

Bagiyeva, G. Z., E-mail: bagieva-gjulandam@rambler.ru; Mustafayev, N. B.; Abdinova, G. Dj.; Abdinov, D. Sh. [National Academy of Sciences of Azerbaijan, Abdullaev Institute of Physics (Azerbaijan)

2011-11-15T23:59:59.000Z

331

Characterization and Analysis of CIGS and CdTE Solar Cells: December 2004 - July 2008  

SciTech Connect (OSTI)

The work reported here embodies a device-physics approach based on careful measurement and interpretation of data from CIGS and CdTe solar cells.

Sites, J. R.

2009-01-01T23:59:59.000Z

332

Some possible sources of IceCube TeV-PeV neutrino events  

E-Print Network [OSTI]

The IceCube Collaboration has observed 37 neutrino events in the energy range $30\\, {\\text TeV}\\lesssim E_{\

Sarira Sahu; Luis Salvador Miranda

2014-08-21T23:59:59.000Z

333

Review of Photovoltaic Energy Production Using CdTe Thin-Film Modules: Extended Abstract Preprint  

SciTech Connect (OSTI)

CdTe has near-optimum bandgap, excellent deposition traits, and leads other technologies in commercial PV module production volume. Better understanding materials properties will accelerate deployment.

Gessert, T. A.

2008-09-01T23:59:59.000Z

334

Fabrication of ultra thin CdS/CdTe solar cells by magnetron sputtering.  

E-Print Network [OSTI]

?? CdTe is a nearly perfect absorber material for second generation polycrystalline solar cells because the bandgap closely matches the peak of the solar spectrum, (more)

Plotnikov, Victor

2009-01-01T23:59:59.000Z

335

Construo e caracterizao de clula solar tipo barreira Schottky CdTe/Al.  

E-Print Network [OSTI]

??In this work the techniques of hot wall epitaxy (HWE) and molecular beam epitaxy (MBE) on thin films of CdTe (cadmium telluride) were used in (more)

Denis Rafael de Oliveira Pereira

2011-01-01T23:59:59.000Z

336

E-Print Network 3.0 - arond te dual-axis Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Michigan University Collection: Mathematics 62 BunchTiming Measurement in the Muon Cooling Experiment Summary: Bunch-Timing Measurement in the Muon Cooling Experiment Via TE...

337

~~~~: Gmt Lakes Cat-bar) ALTERNaTE I  

Office of Legacy Management (LM)

~~~: Gmt Lakes Cat-bar) ~~~: Gmt Lakes Cat-bar) ALTERNaTE I --------------------------------------- NAME: 333 Iv. Mkhi qr) Aw. thka o ~~~---~~~--~~~_-----__ C I TV : 8 Morim 'Love 82 10 bhh &Q Ir -+----------- STATE- fL I - ------ l OWNER(S) -__----_ past: Current: I --------------------____ Owner contacted q yes p no; _____--_____-____------~~~l if yes, data contacted -_--------__- TYPE OF OPERATION ---_------------- 0 Research & Development q Production scale testing 0 Pilot Scale 0 Bench Scale process 0 Theoretical Studies 0 Sample & Analysis Facility Type p Manufacturing I ! fJ University 0 Research Organization ! 0 Government Sponsored F+ci li ty 0 Other ----~~-~~~----~------ 0 Production 0 Disposal/Storage TYPE OF CUNTRKT ----~---~__----_ / w Prime

338

Simple shear processing of bulk BI?TE? alloys  

E-Print Network [OSTI]

diagram of the ECAE process. 26 FIGURE Page 14. Optical photomicrograph of p-type Biz Te& alloy grains before extrusion. . . . . 29 15. Optical photomicrograph of n-type Bi&Tet alloy grains before extrusion . . . . . 30 16. Schematic of ECAE tool... route C at 0. 3 in/min and 500'C 26. Optical photomicrograph of p-type BisTes alloy grains, after two passes 41 via route C at 0. 01 in/min and 500'C 42 FIGURE 27. Optical photomicrograph of p-type Biz Teq alloy grains, after four passes via route...

Im, Jae-taek

2012-06-07T23:59:59.000Z

339

TeV Astrophysics Constraints on Planck Scale Lorentz Violation  

E-Print Network [OSTI]

We analyze observational constraints from TeV astrophysics on Lorentz violating nonlinear dispersion for photons and electrons without assuming any a priori equality between the photon and electron parameters. The constraints arise from thresholds for vacuum Cerenkov radiation, photon decay and photo-production of electron-positron pairs. We show that the parameter plane for cubic momentum terms in the dispersion relations is constrained to an order unity region in Planck units. We find that the threshold configuration can occur with an asymmetric distribution of momentum for pair creation, and with a hard photon for vacuum Cerenkov radiation.

Ted Jacobson; Stefano Liberati; David Mattingly

2002-09-24T23:59:59.000Z

340

Electromagnetic leptogenesis at the TeV scale  

E-Print Network [OSTI]

We construct an explicit model implementing electromagnetic leptogenesis. In a simple extension of the Standard Model, a discrete symmetry forbids the usual decays of the right-handed neutrinos, while allowing for an effective coupling between the left-handed and right-handed neutrinos through the electromagnetic dipole moment. This generates correct leptogenesis with resonant enhancement and also the required neutrino mass via a TeV scale seesaw mechanism. The model is consistent with low energy phenomenology and would have distinct signals in the next generation colliders, and, perhaps even the LHC.

Debajyoti Choudhury; Namit Mahajan; Sudhanwa Patra; Utpal Sarkar

2011-04-11T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

Effect of shells on photoluminescence of aqueous CdTe quantum dots  

SciTech Connect (OSTI)

Graphical abstract: Size-tunable CdTe coated with several shells using an aqueous solution synthesis. CdTe/CdS/ZnS quantum dots exhibited high PL efficiency up to 80% which implies the promising applications for biomedical labeling. - Highlights: CdTe quantum dots were fabricated using an aqueous synthesis. CdS, ZnS, and CdS/ZnS shells were subsequently deposited on CdTe cores. Outer ZnS shells provide an efficient confinement of electron and hole inside the QDs. Inside CdS shells can reduce the strain on the QDs. Aqueous CdTe/CdS/ZnS QDs exhibited high stability and photoluminescence efficiency of 80%. - Abstract: CdTe cores with various sizes were fabricated in aqueous solutions. Inorganic shells including CdS, ZnS, and CdS/ZnS were subsequently deposited on the cores through a similar aqueous procedure to investigate the effect of shells on the photoluminescence properties of the cores. In the case of CdTe/CdS/ZnS quantum dots, the outer ZnS shell provides an efficient confinement of electron and hole wavefunctions inside the quantum dots, while the middle CdS shell sandwiched between the CdTe core and ZnS shell can be introduced to obviously reduce the strain on the quantum dots because the lattice parameters of CdS is situated at the intermediate-level between those of CdTe and ZnS. In comparison with CdTe/ZnS coreshell quantum dots, the as-prepared water-soluble CdTe/CdS/ZnS quantum dots in our case can exhibit high photochemical stability and photoluminescence efficiency up to 80% in an aqueous solution, which implies the promising applications in the field of biomedical labeling.

Yuan, Zhimin; Yang, Ping, E-mail: mse_yangp@ujn.edu.cn

2013-07-15T23:59:59.000Z

342

All-Optical Modulation of Localized Surface Plasmon Coupling in a Hybrid System Composed of Photoswitchable Gratings and Au Nanodisk Arrays  

Science Journals Connector (OSTI)

All-Optical Modulation of Localized Surface Plasmon Coupling in a Hybrid System Composed of Photoswitchable Gratings and Au Nanodisk Arrays ... Components of this work were conducted at the Penn State node of the NSF-funded National Nanotechnology Infrastructure Network. ...

Yan Jun Liu; Yue Bing Zheng; Justin Liou; I-Kao Chiang; Iam Choon Khoo; Tony Jun Huang

2011-03-04T23:59:59.000Z

343

April 1, 2002 / Vol. 27, No. 7 / OPTICS LETTERS 485 Light trapping in a fiber grating defect by four-wave mixing  

E-Print Network [OSTI]

the structures have a slow frequency response. Our approach is somewhat reminiscent of that of Winful and Perlin9 light in a defect state in a nonuniform fiber grating. The amount of energy deposited is estimated and the optical push broom.5 Here we propose another such demonstra- tion, namely, the storage of light

Sipe,J. E.

344

Advanced CdTe Photovoltaic Technology: September 2007 - March 2009  

SciTech Connect (OSTI)

During the last eighteen months, Abound Solar (formerly AVA Solar) has enjoyed significant success under the SAI program. During this time, a fully automated manufacturing line has been developed, fabricated and commissioned in Longmont, Colorado. The facility is fully integrated, converting glass and semiconductor materials into complete modules beneath its roof. At capacity, a glass panel will enter the factory every 10 seconds and emerge as a completed module two hours later. This facility is currently undergoing trials in preparation for large volume production of 120 x 60 cm thin film CdTe modules. Preceding the development of the large volume manufacturing capability, Abound Solar demonstrated long duration processing with excellent materials utilization for the manufacture of high efficiency 42 cm square modules. Abound Solar prototype modules have been measured with over 9% aperture area efficiency by NREL. Abound Solar demonstrated the ability to produce modules at industry leading low costs to NREL representatives. Costing models show manufacturing costs below $1/Watt and capital equipment costs below $1.50 per watt of annual manufacturing capacity. Under this SAI program, Abound Solar supported a significant research and development program at Colorado State University. The CSU team continues to make progress on device and materials analysis. Modeling for increased device performance and the effects of processing conditions on properties of CdTe PV were investigated.

Barth, K.

2011-05-01T23:59:59.000Z

345

Electrolyte electroreflectance study of laser annealing effects on the CdTe/Hg0.8Cd0.2Te (111) system  

Science Journals Connector (OSTI)

We have investigated the effects of laser annealing on the CdTe/Hg0.8Cd0.2Te?(111) system by measuring the electrolyte electroreflectance (EER) spectra from both the CdTe layer as well as the interface region. The sample was a Hg0.8Cd0.2Te?(111) single crystal with a 500??thick polycrystallineCdTefilmdeposited on it; a section of the interface was annealed using the neodymium: yttrium aluminum garnet (Nd:YAG) laser 1.06??m line. Our observations indicate the presence of strain due to lattice mismatch at the interface; laser annealing relieves this strain. In addition the annealing also causes the diffusion of Hg ions from the interfacial region into the passivant layer. The changes in the line shapes of the EER spectra also show an improvement in the crystalline quality of the passivant layer.

P. M. Amirtharaj; Fred H. Pollak; J. R. Waterman; P. R. Boyd

1982-01-01T23:59:59.000Z

346

Superficies y Vaco 12, 16-19, Junio 2001 Sociedad Mexicana de Ciencia de Superficies y de Vaco. Near-IR bandgap engineering employing the alloy (CdTe)x(In2Te3)1-x  

E-Print Network [OSTI]

the closed space vapor transport technique combined with free evaporation. As sources we employed CdTe and In thin films 1. Introduction CdTe and its alloys are versatile optoelectronic materials, some of 1.19 eV and 1.15 eV have been reported [5, 6], suggest the use of the compounds In2Te3 and CdTe

Meléndez Lira, Miguel Angel

347

New limits on the $?^{+}$EC and ECEC processes in $^{120}$Te  

E-Print Network [OSTI]

New limits on the double beta processes for $^{120}$Te have been obtained using a 400 cm$^3$ HPGe detector and a source consisting of natural Te0$_2$ powder. At a confidence level of 90% the limits are $0.19\\times 10^{18}$ y for the $\\beta^+$EC$(0\

A S Barabash; F Hubert; Ph Hubert; V Umatov

2007-03-13T23:59:59.000Z

348

A Proposal of the Method for Energy Measurements of Muons over 10 TeV  

Science Journals Connector (OSTI)

......energy determination method of high energy muons, which is based upon an observation...TeV. The uncertainty of the muon energy to be measured can be reduced if...the Editor paratus when a high energy muon in TeV region traverses through......

Tomonori Wada; Takashi Kitamura

1969-06-01T23:59:59.000Z

349

Photocurrent Mapping of 3D CdSe/CdTe Windowless Solar Cells  

Science Journals Connector (OSTI)

Photocurrent Mapping of 3D CdSe/CdTe Windowless Solar Cells ... back contact; CdSe; CdTe; photovoltaic; 3D solar cells; SPCM ... Scanning photocurrent microscopy (SPCM) has been used to evaluate the local performance of solar cells by scanning a finely focused optical beam across the surface while monitoring device response. ...

Carlos M. Hangarter; Ratan Debnath; Jong Y. Ha; Mehmet A. Sahiner; Christopher J. Reehil; William A. Manners; Daniel Josell

2013-08-22T23:59:59.000Z

350

Unravelling the atomic structure of AgInSbTe phase change materials: Theoretical perspective  

E-Print Network [OSTI]

E*PCOS2011 Unravelling the atomic structure of AgInSbTe phase change materials: Theoretical-GST. Key words: phase change materials, Ag/In/Sb/Te alloys, density functional, molecular dynamics 1. INTRODUCTION Phase change (PC) materials are chalcogenide alloys that switch very rapidly between the amorphous

351

Search for Short Duration Bursts of TeV Gamma Rays with the Milagrito Telescope  

E-Print Network [OSTI]

OG 2.3.07 Search for Short Duration Bursts of TeV Gamma Rays with the Milagrito Telescope Gus for short duration bursts of TeV photons. Such bursts may result from "traditional" gamma-ray bursts to gamma-ray bursts, the final stages of black hole evaporation) the most compelling reason may

California at Santa Cruz, University of

352

Unusual Otto excitation dynamics and enhanced coupling of light to TE plasmons in graphene  

E-Print Network [OSTI]

Unusual Otto excitation dynamics and enhanced coupling of light to TE plasmons in graphene Daniel R are a unique and unusual aspect of graphene's plasmonic response that are predicted to manifest when the sign plasmons in graphene. We show that TE plasmons supported by graphene in an Otto configuration unusually

Park, Namkyoo

353

Development of Nanostructures in Thermoelectric Pb-Te-Sb Alloys , L. A. Collins2  

E-Print Network [OSTI]

in the figure of merit of thermoelectric materials. Fabrication of nanostructured thermoelectric materials via the discovery of materials with a high thermoelectric figure of merit, zT, defined as S2 T/, where immiscible thermoelectric materials: PbTe-Sb2Te3. This ternary system was selected for investigation because

354

Bandgap engineering of CdxZn1xTe nanowires Keivan Davami,a  

E-Print Network [OSTI]

junction. These structures have been used in solar cells2,3 and eld effect transistors.4 Alloy nanowires device fabrication. Alloy nano- wires in various systems have been used to construct solar cells into a furnace. In a set of trial experiments, ZnTe (99.99% Aldrich) and CdTe (99.99% Aldrich) source powders

Cuniberti, Gianaurelio

355

Epitaxial growth of CdTe thin film on cube-textured Ni by metal-organic chemical vapor deposition  

SciTech Connect (OSTI)

CdTe thin film has been grown by metalorganic chemical vapor deposition (MOCVD) on Ni(100) substrate. Using x-ray pole figure measurements we observed the epitaxial relationship of {111}CdTe// {001}Ni with [110]CdTe//[010]Ni and [112] CdTe//[100]Ni. The 12 diffraction peaks in the (111) pole figure of CdTe film and their relative positions with respect to the four peak positions in the (111) pole figure of Ni substrate are consistent with four equivalent orientational domains of CdTe with three to four superlattice match of about 0.7% in the [110] direction of CdTe and the [010] direction of Ni. The electron backscattered diffraction (EBSD) images show that the CdTe domains are 30 degrees orientated from each other.

GIARE, C [Rensselaer Polytechnic Institute (RPI); RAO, S [Rensselaer Polytechnic Institute (RPI); RILEY, M [Rensselaer Polytechnic Institute (RPI); CHEN, L [Rensselaer Polytechnic Institute (RPI); Goyal, Amit [ORNL; BHAT, I [Rensselaer Polytechnic Institute (RPI); LU, T [Rensselaer Polytechnic Institute (RPI); WANG, G [Rensselaer Polytechnic Institute (RPI)

2012-01-01T23:59:59.000Z

356

ZnO/Sn:In2O3 and ZnO/CdTe band offsets for extremely thin absorber...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ZnOSn:In2O3 and ZnOCdTe band offsets for extremely thin absorber photovoltaics . ZnOSn:In2O3 and ZnOCdTe band offsets for extremely thin absorber photovoltaics . Abstract: Band...

357

Temporal characteristics of polarization holographic gratings formed in a photosensitive polymeric film containing N-benzylideneaniline derivative side groups  

SciTech Connect (OSTI)

A polarization holographic grating was recorded in a transparent thin film formed from polymethacrylate with N-benzylideneaniline (NBA) derivative side groups. We measured the real time diffraction properties. The data were analyzed based on a theoretical model that accounted for the distribution of optical anisotropy caused by molecular reorientation as well as for surface relief (SR) deformation caused by molecular motion. Optical anisotropy rapidly increased and then slowly decreased, with increasing recording time. This phenomenon was described based on photoisomerization and photocleavage reactions of the NBA side groups. SR deformation was also induced in the film by polarization holographic recording, without any subsequent processes. The photoinduced optical anisotropy and SR deformation were retained after the recording was turned off.

Sasaki, Tomoyuki, E-mail: sasaki-tomoy@vos.nagaokaut.ac.jp; Shoho, Takashi; Noda, Kohei; Ono, Hiroshi [Department of Electrical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 (Japan); Kawatsuki, Nobuhiro [Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 (Japan)

2014-04-21T23:59:59.000Z

358

Polarization gratings in the short-pitch approximation: electro-optics of deformed helix ferroelectric liquid crystals  

E-Print Network [OSTI]

Electro-optical properties of deformed helix ferroelectric liquid crystal (DHFLC) cells are studied by using a general theoretical approach to polarization gratings in which the transmission and reflection matrices of diffraction orders are explicitly related to the evolution operator of equations for the Floquet harmonics. In the short-pitch approximation, a DHFLC cell is shown to be optically equivalent to a uniformly anisotropic biaxial layer where one of the optical axes is normal to the substrates. For in-plane anisotropy, orientation of the optical axes and birefringence are both determined by the voltage applied across the cell and represent the parameters that govern the transmittance of normally incident light passing through crossed polarizers. We calculate the transmittance as a function of the applied voltage and compare the computed curves with the experimental data. The theoretical and experimental results are found to be in good agreement.

Alexei D. Kiselev; Eugene P. Pozhidaev; Vladimir G. Chigrinov; Hoi-Sing Kwok

2010-11-19T23:59:59.000Z

359

Optical Transient-Grating Measurements of Spin Diffusion andRelaxation in a Two-Dimensional Electron Gas  

SciTech Connect (OSTI)

Spin diffusion in n-GaAs quantum wells, as measured by our optical transient-grating technique, is strongly suppressed relative to that of charge. Over a broad range of temperatures and dopings, the suppression of Ds relative to Dc agrees quantitatively with the prediction of ''spin Coulomb dra'' theory, which takes into account the exchange of spin in electron-electron collisions. Moreover, the spin-diffusion length, Ls, is a nearly constant 1 micrometer over the same range of T and n, despite Ds's varying by nearly two orders of magnitude. This constancy supports the D'yakonov-Perel'-Kachorovskii model of spin relaxation through interrupted precessional dephasing in the spin-orbit field.

Weber, Christopher P.

2005-12-15T23:59:59.000Z

360

Band gap of CdTe and Cd{sub 0.9}Zn{sub 0.1}Te crystals  

SciTech Connect (OSTI)

The band gap E{sub g} of the CdTe and Cd{sub 0.9}Zn{sub 0.1}Te crystals and its temperature dependence are determined by optical methods. This is motivated by considerable contradictoriness of the published data, which hampers the interpretation and calculation of characteristics of detectors of X-ray and {gamma} radiation based on these materials (E{sub g} = 1.39-1.54 and 1.51-1.6 eV for CdTe and Cd{sub 0.9}Zn{sub 0.1}Te, respectively). The used procedure of determination of E{sub g} is analyzed from the viewpoint of the influence of the factors leading to inaccuracies in determination of its value. The measurements are performed for well-purified high-quality samples. The acquired data for CdTe (E{sub g} = 1.47-1.48 eV) and Cd{sub 0.9}Zn{sub 0.1}Te (E{sub g} = 1.52-1.53 eV) at room temperature substantially narrow the range of accurate determination of E{sub g}.

Kosyachenko, L. A., E-mail: lakos@chv.ukrpact.net; Sklyarchuk, V. M.; Sklyarchuk, O. V.; Maslyanchuk, O. L. [Chernovtsy National University (Ukraine)

2011-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

Phase formation and phase transformations in Bi-Te films with nanoscale thickness  

SciTech Connect (OSTI)

The processes of phase formation are studied in a binary Bi-Te system using the kinematic electron diffraction technique. It is established that, in the case of both simultaneous and layer-by-layer deposition of bismuth and tellurium and irrespective of the order of their deposition, phases with compositions Bi{sub 2}Te{sub 3} and BiTe are formed at the condensation plane in the amorphous and crystalline state, respectively. The amorphous Bi{sub 2}Te{sub 3} phase is stable at room temperature and crystallizes at a temperature of 423 K. It is shown that ordering of the phase BiTe is not a consequence of atomic order of the structure; rather, it is caused by the real structure of the object (by blocks)

Akhmedov, K. M. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)], E-mail: axmedovqurban@rambler.ru

2008-09-15T23:59:59.000Z

362

Growth of CdTe thin films on graphene by close-spaced sublimation method  

SciTech Connect (OSTI)

CdTe thin films grown on bi-layer graphene were demonstrated by using the close-spaced sublimation method, where CdTe was selectively grown on the graphene. The density of the CdTe domains was increased with increasing the number of the defective sites in the graphene, which was controlled by the duration of UV exposure. The CdTe growth rate on the bi-layer graphene electrodes was 400?nm/min with a bandgap energy of 1.451.49?eV. Scanning electron microscopy, micro-Raman spectroscopy, micro-photoluminescence, and X-ray diffraction technique were used to confirm the high quality of the CdTe thin films grown on the graphene electrodes.

Jung, Younghun; Yang, Gwangseok; Kim, Jihyun, E-mail: hyunhyun7@korea.ac.kr [Department of Chemical and Biological Engineering, Korea University, Seoul 136-701 (Korea, Republic of)] [Department of Chemical and Biological Engineering, Korea University, Seoul 136-701 (Korea, Republic of); Chun, Seungju; Kim, Donghwan [Department of Materials Science and Engineering, Korea University, Seoul 136-701 (Korea, Republic of)] [Department of Materials Science and Engineering, Korea University, Seoul 136-701 (Korea, Republic of)

2013-12-02T23:59:59.000Z

363

Cd-rich and Te-rich low-temperature photoluminescence in cadmium telluride  

SciTech Connect (OSTI)

Low-temperature photoluminescence emission spectra were measured in cadmium telluride (CdTe) samples in which composition was varied to promote either Cd or Te-rich stoichiometry. The ability to monitor stoichiometry is important, since it has been shown to impact carrier recombination. Te-rich samples show transitions corresponding to acceptor-bound excitons (?1.58?eV) and free-electron to acceptor transitions (?1.547?eV). In addition to acceptor-bound excitons, Cd-rich samples show transitions assigned to donor-bound excitons (1.591?eV) and Te vacancies at 1.552?eV. Photoluminescence is a noninvasive way to monitor stoichiometric shifts induced by post-deposition anneals in polycrystalline CdTe thin films deposited by close-spaced sublimation.

Albin, D. S., E-mail: david.albin@nrel.gov; Kuciauskas, D.; Ma, J.; Metzger, W. K.; Burst, J. M.; Moutinho, H. R.; Dippo, P. C. [National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)

2014-03-03T23:59:59.000Z

364

TenTen: A New Array of Multi-TeV Imaging Cherenkov Telescopes  

E-Print Network [OSTI]

The exciting results from H.E.S.S. point to a new population of gamma-ray sources at energies E > 10 TeV, paving the way for future studies and new discoveries in the multi-TeV energy range. Connected with these energies is the search for sources of PeV cosmic-rays (CRs) and the study of multi-TeV gamma-ray production in a growing number of astrophysical environments. TenTen is a proposed stereoscopic array (with a suggested site in Australia) of modest-sized (10 to 30m^2) Cherenkov imaging telescopes with a wide field of view (8 to 10deg diameter) optimised for the E~10 to 100 TeV range. TenTen will achieve an effective area of ~10 km^2 at energies above 10 TeV. We outline here the motivation for TenTen and summarise key performance parameters.

Rowell, G; Clay, R; Dawson, B; Denman, J; Protheroe, R; Smith, A G K; Thornton, G; Wild, N

2007-01-01T23:59:59.000Z

365

TenTen: A New Array of Multi-TeV Imaging Cherenkov Telescopes  

E-Print Network [OSTI]

The exciting results from H.E.S.S. point to a new population of gamma-ray sources at energies E > 10 TeV, paving the way for future studies and new discoveries in the multi-TeV energy range. Connected with these energies is the search for sources of PeV cosmic-rays (CRs) and the study of multi-TeV gamma-ray production in a growing number of astrophysical environments. TenTen is a proposed stereoscopic array (with a suggested site in Australia) of modest-sized (10 to 30m^2) Cherenkov imaging telescopes with a wide field of view (8 to 10deg diameter) optimised for the E~10 to 100 TeV range. TenTen will achieve an effective area of ~10 km^2 at energies above 10 TeV. We outline here the motivation for TenTen and summarise key performance parameters.

G. Rowell; V. Stamatescu; R. Clay; B. Dawson; J. Denman; R. Protheroe; A. G. K. Smith; G. Thornton; N. Wild

2007-10-10T23:59:59.000Z

366

V-183: Cisco TelePresence TC and TE Bugs Let Remote Users Deny Service and  

Broader source: Energy.gov (indexed) [DOE]

3: Cisco TelePresence TC and TE Bugs Let Remote Users Deny 3: Cisco TelePresence TC and TE Bugs Let Remote Users Deny Service and Remote Adjacent Authenticated Users Gain Root Shell Access V-183: Cisco TelePresence TC and TE Bugs Let Remote Users Deny Service and Remote Adjacent Authenticated Users Gain Root Shell Access June 21, 2013 - 6:00am Addthis PROBLEM: Three vulnerabilities were reported in Cisco TelePresence TC and TE PLATFORM: The following product models are affected by the vulnerabilities: Cisco TelePresence MX Series Cisco TelePresence System EX Series Cisco TelePresence Integrator C Series Cisco TelePresence Profiles Series running Cisco TelePresence Quick Set Series Cisco IP Video Phone E20 ABSTRACT: Cisco TelePresence TC and TE Software contain two vulnerabilities in the implementation of the Session Initiation Protocol (SIP) that could allow an

367

Investigation of ultrafast photothermal surface expansion and diffusivity in GaAs via laser-induced dynamic gratings  

SciTech Connect (OSTI)

This thesis details the first direct ultrafast measurements of the dynamic thermal expansion of a surface and the temperature dependent surface thermal diffusivity using a two-color reflection transient grating technique. Studies were performed on p-type, n-type, and undoped GaAs(100) samples over a wide range of temperatures. By utilizing a 90 fs ultraviolet probe with visible excitation beams, the effects of interband saturation and carrier dynamics become negligible; thus lattice expansion due to heating and subsequent contraction caused by cooling provided the dominant influence on the probe. At room temperature a rise due to thermal expansion was observed, corresponding to a maximum net displacement of {approximately} 1 {Angstrom} at 32 ps. The diffracted signal was composed of two components, thermal expansion of the surface and heat flow away from the surface, thus allowing a determination of the rate of expansion as well as the surface thermal diffusivity, D{sub S}. By varying the fringe spacing of the grating, this technique has the potential to separate the signal contributions to the expansion of the lattice in the perpendicular and parallel directions. In the data presented here a large fringe spacing was used, thus the dominant contribution to the rising edge of the signal was expansion perpendicular to the surface. Comparison of he results with a straightforward thermal model yields good agreement over a range of temperatures (20--300{degrees}K). Values for D{sub S} in GaAs were measured and found to be in reasonable agreement with bulk values above 50{degrees}K. Below 50{degrees}K, D{sub S} were determined to be up to an order of magnitude slower than the bulk diffusivity due to increased phonon boundary scattering. The applicability and advantages of the TG technique for studying photothermal and photoacoustic phenomena are discussed.

Pennington, D.M.

1992-04-01T23:59:59.000Z

368

CdTe Feedstock Development and Validation: Cooperative Research and Development Final Report, CRADA Number CRD-08-00280  

SciTech Connect (OSTI)

The goal of this work was to evaluate different CdTe feedstock formulations (feedstock provided by Redlen) to determine if they would significantly improve CdTe performance with ancillary benefits associated with whether changes in feedstock would affect CdTe cell processing and possibly reliability of cells. Feedstock also included attempts to intentionally dope the CdTe with pre-selected elements.

Albin, D.

2011-05-01T23:59:59.000Z

369

Investigation of Junction Properties of CdS/CdTe Solar Cells and their Correlation to Device Properties (Presentation)  

SciTech Connect (OSTI)

The objective of the Junction Studies are: (1) understand the nature of the junction in the CdTe/CdS device; (2) correlate the device fabrication parameters to the junction formation; and (3) develop a self consistent device model to explain the device properties. Detailed analysis of CdS/CdTe and SnO{sub 2}/CdTe devices prepared using CSS CdTe is discussed.

Dhere, R. G.; Zhang, Y.; Romero, M. J.; Asher, S. E.; Young, M.; To, B.; Noufi, R.; Gessert, T. A.

2008-05-01T23:59:59.000Z

370

HIGH EFFICIENCY CdTe/CdS THIN FILM SOLAR CELLS WITH A NOVEL BACK-CONTACT Nicola Romeoa  

E-Print Network [OSTI]

HIGH EFFICIENCY CdTe/CdS THIN FILM SOLAR CELLS WITH A NOVEL BACK-CONTACT Nicola Romeoa , Alessio in the fabrication of high efficiency CdTe/CdS thin film solar cells. Usually, it is done first by etching the Cd: Back Contact, CdTe, Thin Film 1 INTRODUCTION The back contact in the CdTe/CdS thin film solar cell

Romeo, Alessandro

371

OPTIMIZATION OF GRADED BAND GAP CdHgTe SOLAR CELLS A. BOUAZZI (*), Y. MARFAING and J. MIMILA-ARROYO  

E-Print Network [OSTI]

limited to 6 % in Cu2Te/CdTe junctions [4, 5], 7.9 % in CdS/CdTe heterojunctions and 6 % in homojunc with uniform doping followed by a base region with uni- form gap and doping. Our goal is to find the optimum

Boyer, Edmond

372

PHONONS-DEFECTS INTERACTIONS IN CdTe J. L. TISSOT, P. L. VUILLERMOZ and A. LAUGIER  

E-Print Network [OSTI]

267 PHONONS-DEFECTS INTERACTIONS IN CdTe J. L. TISSOT, P. L. VUILLERMOZ and A. LAUGIER Laboratoire Einstein, 69621 Villeurbanne Cedex, France Résumé. 2014 Les défauts électriquement inactifs dans CdTe ont of electrically inactive defects has been performed on CdTe single crystals by two different experimental

Boyer, Edmond

373

Interference effects in photoreflectance and contactless electroreflectance spectra of CdTe films grown on Si substrate  

E-Print Network [OSTI]

Interference effects in photoreflectance and contactless electroreflectance spectra of CdTe films and contactless electroreflectance CER spectra of CdTe films grown on Si substrate, at energies below the band gap of CdTe. The simultaneous observation of OF in the reflectance (R) spectrum having the same period

Ghosh, Sandip

374

PHYSICAL REVIEW B 84, 205305 (2011) Spin-phonon coupling in single Mn-doped CdTe quantum dot  

E-Print Network [OSTI]

PHYSICAL REVIEW B 84, 205305 (2011) Spin-phonon coupling in single Mn-doped CdTe quantum dot C. L dynamics of a single Mn atom in a laser driven CdTe quantum dot is addressed theoretically. Recent of single Mn-doped CdTe dots, information about the quantum spin state of a single Mn atom is extracted from

Paris-Sud XI, Université de

375

Quantifying electron-phonon coupling in CdTe12xSex nanocrystals via coherent phonon manipulation  

E-Print Network [OSTI]

Quantifying electron-phonon coupling in CdTe12xSex nanocrystals via coherent phonon manipulation B to manipulate coherent phonon excitation and quantify the strength of electron-phonon coupling in CdTe1?xSex nanocrystals (NCs). Raman active CdSe and CdTe longitudinal optical phonon (LO) modes are excited and probed

Xu, Xianfan

376

Effect of Shunts on Thin-Film CdTe Module Performance. Galymzhan T. Koishiyev, James R. Sites  

E-Print Network [OSTI]

Effect of Shunts on Thin-Film CdTe Module Performance. Galymzhan T. Koishiyev, James R. Sites circuit model is used to analyze the impact of shunts on basic performance parameters of a CdTe thin with each other in their effect on the module. To address these questions, a 2-D circuit model of a CdTe

Sites, James R.

377

CdTe EPITAXIAL FILMS AND THEIR PROPERTIES S. N. MAXIMOVSKY, I. P. REVOCATOVA, V. M. SALMAN,  

E-Print Network [OSTI]

161 CdTe EPITAXIAL FILMS AND THEIR PROPERTIES S. N. MAXIMOVSKY, I. P. REVOCATOVA, V. M. SALMAN, M CdTe films of p and n type conductivity with a given devia- tion of film composition from PHYSIQUE APPLIQU?E TOME 12, F?VRIER 1977, PAGE 161 The design of reliable CdTe nuclear radiation counters

Paris-Sud XI, Université de

378

Post-Synthesis Crystallinity Tailoring of Water-Soluble Polymer Encapsulated CdTe Nanoparticles using Rapid Thermal Annealing  

E-Print Network [OSTI]

Post-Synthesis Crystallinity Tailoring of Water-Soluble Polymer Encapsulated CdTe Nanoparticles The crystallinity of colloidal CdTe nanoparticles has been enhanced post synthesis. This control over CdTe NPs have been demonstrated suitable for use in applications involving efficient solar cells

379

A SMALL PORTABLE DETECTOR HEAD USING MIS-CONTACTED CdTe FOR X-RAY SPECTROMETRY  

E-Print Network [OSTI]

339 A SMALL PORTABLE DETECTOR HEAD USING MIS-CONTACTED CdTe FOR X-RAY SPECTROMETRY P. EICHINGER for semiconductor radiation detectors is discussed. A versatile head consisting of a 2 mm thick, 10 mm diameter CdTe and its applica- tion to CdTe and CdS has already been published [2, 3], but because of the many

Paris-Sud XI, Université de

380

Substrate effect on CdTe layers grown by metalorganic vapor phase N. V. Sochinskiia),b)  

E-Print Network [OSTI]

Substrate effect on CdTe layers grown by metalorganic vapor phase epitaxy N. V. Sochinskiia for publication 30 December 1996 CdTe layers were grown by metalorganic vapor phase epitaxy MOVPE on different substrates like sapphire, GaAs, and CdTe wafers. The growth was carried out at the temperature 340 °C

Viña, Luis

Note: This page contains sample records for the topic "te grated analy" 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

Photoluminescence Studies on Cu and O Defects in Crystalline and Thin-film CdTe Caroline R. Corwine,1  

E-Print Network [OSTI]

Photoluminescence Studies on Cu and O Defects in Crystalline and Thin-film CdTe Caroline R. Corwine Laboratory, Golden, CO 80401 ABSTRACT Polycrystalline thin-film CdTe is one of the leading materials used various process steps alter defect states in the CdTe layer. Low-temperature photoluminescence (PL

Sites, James R.

382

CARRIER TRANSPORT AND TRAPPING PROCESS IN HIGH-RESISTIVITY CdTe GROWN BY A MODIFIED THM  

E-Print Network [OSTI]

189 CARRIER TRANSPORT AND TRAPPING PROCESS IN HIGH-RESISTIVITY CdTe GROWN BY A MODIFIED THM T, PAGE 189 1. Introduction. - Recent results of studies on carrier transport in high-purity CdTe crystals current measure- ments. This paper discusses trapping and detrapping effects in high-resistivity CdTe

Paris-Sud XI, Université de

383

Micron-Resolution Photocurrent of CdTe Solar Cells Using Multiple Wavelengths Jason F. Hiltner1  

E-Print Network [OSTI]

Micron-Resolution Photocurrent of CdTe Solar Cells Using Multiple Wavelengths Jason F. Hiltner1 variations in the quantum efficiency near the CdTe band gap, which track intermixing of Cd wavelengths with energies near and slightly below the CdTe band gap (1.5 eV) to be used. Temperature tuning

Sites, James R.

384

Paul Sellin, Centre for Nuclear and Radiation Physics Charge transport and mobility mapping in CdTe  

E-Print Network [OSTI]

Paul Sellin, Centre for Nuclear and Radiation Physics Charge transport and mobility mapping in CdTe, JAP 92 (2002) 3198-3206 Introduction Motivation for this Work: r THM-grown CdTe supplied by Eurorad signal response? r Pulse shape analysis can identify regions of trapping or reduced mobility r Does CdTe

Sellin, Paul

385

ATLAS SUSY search prospects at 10 TeV  

E-Print Network [OSTI]

The search for physics beyond the Standard Model (BSM) is one of the most important goals for the general purpose detector ATLAS at the Large Hadron Collider at CERN. Already with early LHC data, the ATLAS experiment should be sensitive to discover physics beyond the Standard Model. This paper summarizes the prospects of the ATLAS experiment to find experimental evidence for Supersymmetry (SUSY) and Universal Extra Dimensions (UED) in channels with jets, leptons and missing transverse energy for an integrated luminosity of L = 200pb-1 at a centre-of-mass energy sqrt s = 10 TeV. Only a selection of the results is presented focussing on the the discovery reach for inclusive searches.

Janet Dietrich

2009-10-29T23:59:59.000Z

386

Prospects for Electroweakino Discovery at a 100 TeV Hadron Collider  

E-Print Network [OSTI]

We investigate the prospects of discovering split Supersymmetry at a future 100 TeV proton-proton collider through the direct production of electroweakino next-to-lightest-supersymmetric-particles (NLSPs). We focus on signatures with multi-lepton and missing energy: $3\\ell$, opposite-sign dileptons and same-sign dileptons. We perform a comprehensive study of different electroweakino spectra. A 100 TeV collider with 3000/fb data is expected to exclude Higgsino thermal dark matter candidates with $m_{\\rm{LSP}}\\sim 1 $ TeV if Wino NLSPs are lighter than about 3.2 TeV. The $3\\ell$ search usually offers the highest mass reach, which varies in the range of (2-4) TeV depending on scenarios. In particular, scenarios with light Higgsinos have generically simplified parameter dependences. We also demonstrate that, at a 100 TeV collider, lepton collimation becomes a crucial issue for NLSPs heavier than about 2.5 TeV. We finally compare our results with the discovery prospects of gluino pair productions and deduce which ...

Gori, Stefania; Wang, Lian-Tao; Wells, James D

2014-01-01T23:59:59.000Z

387

Prospects for Electroweakino Discovery at a 100 TeV Hadron Collider  

E-Print Network [OSTI]

We investigate the prospects of discovering split Supersymmetry at a future 100 TeV proton-proton collider through the direct production of electroweakino next-to-lightest-supersymmetric-particles (NLSPs). We focus on signatures with multi-lepton and missing energy: $3\\ell$, opposite-sign dileptons and same-sign dileptons. We perform a comprehensive study of different electroweakino spectra. A 100 TeV collider with 3000/fb data is expected to exclude Higgsino thermal dark matter candidates with $m_{\\rm{LSP}}\\sim 1 $ TeV if Wino NLSPs are lighter than about 3.2 TeV. The $3\\ell$ search usually offers the highest mass reach, which varies in the range of (2-4) TeV depending on scenarios. In particular, scenarios with light Higgsinos have generically simplified parameter dependences. We also demonstrate that, at a 100 TeV collider, lepton collimation becomes a crucial issue for NLSPs heavier than about 2.5 TeV. We finally compare our results with the discovery prospects of gluino pair productions and deduce which SUSY breaking model can be discovered first by electroweakino searches.

Stefania Gori; Sunghoon Jung; Lian-Tao Wang; James D. Wells

2014-10-23T23:59:59.000Z

388

Studies on optoelectronic properties of DC reactive magnetron sputtered CdTe thin films  

SciTech Connect (OSTI)

Cadmium telluride continues to be a leading candidate for the development of cost effective photovoltaics for terrestrial applications. In the present work two individual metallic targets of Cd and Te were used for the deposition of CdTe thin films on mica substrates from room temperature to 300 C by DC reactive magnetron sputtering method. XRD patterns of CdTe thin films deposited on mica substrates exhibit peaks at 2? = 27.7, 46.1 and 54.6, which corresponds to reflection on (1 1 1), (2 2 0) and (3 1 1) planes of CdTe cubic structure. The intensities of XRD patterns increases with the increase of substrate temperature upto 150 C and then it decreases at higher substrate temperatures. The conductivity of CdTe thin films measured from four probe method increases with the increase of substrate temperature. The activation energies (?E) are found to be decrease with the increase of substrate temperature. The optical transmittance spectra of CdTe thin films deposited on mica have a clear interference pattern in the longer wavelength region. The films have good transparency (T > 85 %) exhibiting interference pattern in the spectral region between 1200 2500 nm. The optical band gap of CdTe thin films are found to be in the range of 1.48 1.57. The refractive index, n decreases with the increase of wavelength, ?. The value of n and k increases with the increase of substrate temperature.

Kumar, B. Rajesh, E-mail: rajphyind@gmail.com [Department of Physics, Sri Venkateswara University, Tirupati - 517 502, A.P, India and Department of Physics, Sri Krishnadevaraya University, Anantapur - 515 003, A.P (India); Hymavathi, B.; Rao, T. Subba [Department of Physics, Sri Krishnadevaraya University, Anantapur - 515 003, A.P (India)

2014-01-28T23:59:59.000Z

389

Simulation of relaxation times and energy spectra of the CdTe/Hg{sub 1-x}Cd{sub x}Te/CdTe quantum well for variable valence band offset, well width, and composition x  

SciTech Connect (OSTI)

The dependences of relaxation times and energy spectrum of the CdTe/Hg{sub 1-x}Cd{sub x}Te/CdTe quantum well (QW) on its parameters were simulated in the cadmium molar fraction range 0 < x < 0.16. It was found that the x increase from 0 to 0.16 changes electron wave function localization in the QW. A criterion for determining the number of interface levels of localized electrons depending on QW parameters was obtained. The effect of a sharp (by two orders of magnitude) increase in the relaxation time of localized electrons was detected at small QW widths and x close to 0.16.

Melezhik, E. O., E-mail: emelezhik@gmail.com; Gumenjuk-Sichevska, J. V.; Sizov, F. F. [National Academy of Sciences, Lashkariev Institute of Semiconductor Physics (Ukraine)

2010-10-15T23:59:59.000Z

390

Effect of low energy ion irradiation on CdTe crystals: Luminescence enhancement  

SciTech Connect (OSTI)

In this work we show that low energy ion sputtering is a very efficient technique as a cleaning process for CdTe substrates. We demonstrate, by using several techniques like grazing-angle x-ray diffraction, cathodoluminescence, microluminescence, and micro-Raman spectroscopy that the luminescent properties of CdTe substrates can be very much increased when CdTe surfaces are irradiated with low energy Argon ions. We postulate that this enhancement is mainly due to the removal of surface damage induced by the cutting and polishing processes. The formation of a low density of nonluminescent aggregates after the sputtering process has also been observed.

Olvera, J.; Plaza, J. L.; Dios, S. de; Dieguez, E. [Departamento de Fisica de Materiales, Laboratorio de Crecimiento de Cristales, Facultad de Ciencias, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid (Spain); Martinez, O.; Avella, M. [Departamento Fisica Materia Condensada, GdS-Optronlab Group, Universidad de Valladolid, Edificio I-D, Paseo de Belen 1, 47011 Valladolid (Spain)

2010-12-15T23:59:59.000Z

391

Chapter 1.19: Cadmium Telluride Photovoltaic Thin Film: CdTe  

SciTech Connect (OSTI)

The chapter reviews the history, development, and present processes used to fabricate thin-film, CdTe-based photovoltaic (PV) devices. It is intended for readers who are generally familiar with the operation and material aspects of PV devices but desire a deeper understanding of the process sequences used in CdTe PV technology. The discussion identifies why certain processes may have commercial production advantages and how the various process steps can interact with each other to affect device performance and reliability. The chapter concludes with a discussion of considerations of large-area CdTe PV deployment including issues related to material availability and energy-payback time.

Gessert, T. A.

2012-01-01T23:59:59.000Z

392

Search for Neutral Heavy Leptons in the NuTeV Experiment at Fermilab  

E-Print Network [OSTI]

Preliminary results from a search for neutral heavy leptons in the NuTeV experiment at Fermilab. The upgraded NuTeV neutrino detector for the 1996-1997 run included an instrumented decay region for the NHL search which, combined with the NuTeV calorimeter, allows detection in several decay modes (mu-mu-nu, mu-e-nu, mu-pi, e-pi, and e-e-nu). We see no evidence for neutral heavy leptons in our current search in the mass range from 0.3 GeV to 2.0 GeV decaying into final states containing a muon.

NuTeV Collaboration; R. B. Drucker

1998-11-23T23:59:59.000Z

393

Development of a soft x-ray diffractometer for a wideband multilayer grating with a novel layer structure in the 2-4 keV range  

SciTech Connect (OSTI)

We have been developing a wavelength-dispersive soft x-ray spectrograph covering an energy region of 50-4000 eV to attach to a conventional electron microscope. Observation of soft x-ray emission in the 2-4 keV range needs a multilayer coated grating. In order to evaluate the performance of the optical component in the energy region, a goniometric apparatus has been newly developed and the preliminary performance has been tested using synchrotron radiation.

Imazono, Takashi; Koike, Masato; Kawachi, Tetsuya; Hasegawa, Noboru; Koeda, Masaru; Nagano, Tetsuya; Sasai, Hiroyuki; Oue, Yuki; Yonezawa, Zeno; Kuramoto, Satoshi; Terauchi, Masami; Takahashi, Hideyuki; Handa, Nobuo; Murano, Takanori [Quantum Beam Science Directorate, Japan Atomic Energy Agency, 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215 (Japan); Device Dept., Shimadzu Corp., 1 Nishinokyo-Kuwabara-cho, Nakagyo-ku, Kyoto 604-8511 (Japan); IMRAM, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan); ECBU, JEOL Ltd., 3-1-2 Musashino, Akishima, Tokyo 196-8558 (Japan)

2012-07-11T23:59:59.000Z

394

Measurement of electron-hole friction in an n-doped GaAs/AlGaAs quantum well using optical transient-grating spectroscopy  

SciTech Connect (OSTI)

We use phase-resolved transient grating spectroscopy to measure the drift and diffusion of electron-hole density waves in a semiconductor quantum well. The unique aspects of this optical probe allow us to determine the frictional force between a two-dimensional Fermi liquid of electrons and a dilute gas of holes. Knowledge of electron-hole friction enables prediction of ambipolar dynamics in high-mobility electron systems.

Yang, Luyi; Koralek, J. D.; Orenstein, J.; Tibbetts, D. R.; Reno, J. L.; Lilly, M. P.

2011-04-26T23:59:59.000Z

395

The TE Wave Transmission Method for Electron Cloud Measurements at Cesr-TA  

E-Print Network [OSTI]

CLOUD MEASUREMENTS AT CESR-TA* S. De Santis # , J. Byrd,Wave measurements at the Cesr-TA ring at Cornell University.CBP-836 THE TE WAVE TRANSMISSION METHOD FOR

Desantis, S.

2010-01-01T23:59:59.000Z

396

Energy spectrum of cosmic ray muons above 10 TeV according to BUST data  

Science Journals Connector (OSTI)

The energy spectrum of cosmic ray muons in the range of several TeV to ... obtained through the analysis of multiple interactions of muons (the pair meter technique) in the ... are compared with prior BUST data o...

A. G. Bogdanov; R. P. Kokoulin

2011-03-01T23:59:59.000Z

397

TeV scale left-right symmetry with spontaneous D-parity breaking  

SciTech Connect (OSTI)

The different scenarios of spontaneous breaking of D parity have been studied in both the nonsupersymmetric and the supersymmetric version of the left-right symmetric models (LRSM). We explore the possibility of a TeV scale SU(2){sub R} breaking scale M{sub R} and hence TeV scale right-handed neutrinos from both minimization of the scalar potential as well as the coupling constant unification point of view. We show that, although minimization of the scalar potential allows the possibility of a TeV scale M{sub R} and tiny neutrino masses in LRSM with spontaneous D-parity breaking, the gauge coupling unification at a high scale {approx}10{sup 16} GeV does not favor a TeV scale symmetry breaking except in the supersymmetric left-right model with Higgs doublet and bidoublet. The phenomenology of neutrino mass is also discussed.

Borah, Debasish [Indian Institute of Technology Bombay, Mumbai-400076 (India); Patra, Sudhanwa; Sarkar, Utpal [Physical Research Laboratory, Ahmedabad-380009 (India)

2011-02-01T23:59:59.000Z

398

Molybdenum Nitride Films in the Back Contact Structure of Flexible Substrate CdTe Solar Cells.  

E-Print Network [OSTI]

??CdTe solar cells in the superstrate configuration have achieved record efficiencies of 16% but those in the substrate configuration have reached efficiencies of only 7.8%. (more)

Guntur, Vasudha

2011-01-01T23:59:59.000Z

399

Optical properties of single ZnTe nanowires grown at low temperature  

SciTech Connect (OSTI)

Optically active gold-catalyzed ZnTe nanowires have been grown by molecular beam epitaxy, on a ZnTe(111) buffer layer, at low temperature (350 C) under Te rich conditions, and at ultra-low density (from 1 to 5 nanowires per ?m{sup 2}). The crystalline structure is zinc blende as identified by transmission electron microscopy. All nanowires are tapered and the majority of them are <111> oriented. Low temperature micro-photoluminescence and cathodoluminescence experiments have been performed on single nanowires. We observe a narrow emission line with a blue-shift of 2 or 3 meV with respect to the exciton energy in bulk ZnTe. This shift is attributed to the strain induced by a 5 nm-thick oxide layer covering the nanowires, and this assumption is supported by a quantitative estimation of the strain in the nanowires.

Artioli, A.; Stepanov, P.; Den Hertog, M.; Bougerol, C.; Genuist, Y.; Donatini, F.; Andr, R.; Nogues, G.; Tatarenko, S.; Ferrand, D.; Cibert, J. [Inst NEEL, Universiy of Grenoble Alpes, F-38042 Grenoble (France) [Inst NEEL, Universiy of Grenoble Alpes, F-38042 Grenoble (France); Inst NEEL, CNRS, F-38042 Grenoble (France); Rueda-Fonseca, P. [Inst NEEL, Universiy of Grenoble Alpes, F-38042 Grenoble (France) [Inst NEEL, Universiy of Grenoble Alpes, F-38042 Grenoble (France); Inst NEEL, CNRS, F-38042 Grenoble (France); INAC, CEA and Universit de Grenoble, 17 rue des Martyrs, 38054 Grenoble (France); Bellet-Amalric, E.; Kheng, K. [INAC, CEA and Universit de Grenoble, 17 rue des Martyrs, 38054 Grenoble (France)] [INAC, CEA and Universit de Grenoble, 17 rue des Martyrs, 38054 Grenoble (France)

2013-11-25T23:59:59.000Z

400

UNIVERSITY OF CALIFORNIA, TeV Energy Spectra of the Crab Nebula, Mrk 421 and  

E-Print Network [OSTI]

UNIVERSITY OF CALIFORNIA, IRVINE TeV Energy Spectra of the Crab Nebula, Mrk 421 and the Cygnus . . . . . . . . . . . . . . . . . . . . 2 i Cosmic Rays . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ii The Search for the Origin with Milagro . . . . . . . . . . . . . . . . . . . . . 69 IVThe Milagro Energy Reconstruction Algorithm 73 I

California at Santa Cruz, University of

Note: This page contains sample records for the topic "te grated analy" 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

V-183: Cisco TelePresence TC and TE Bugs Let Remote Users Deny...  

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

Cisco TelePresence Profiles Series running Cisco TelePresence Quick Set Series Cisco IP Video Phone E20 ABSTRACT: Cisco TelePresence TC and TE Software contain two vulnerabilities...

402

Collimation and Radiative Deceleration of Jets in TeV AGNs  

E-Print Network [OSTI]

We consider some implications of the rapid X-ray and TeV variability observed in M87 and the TeV blazars. We outline a model for jet focusing and demonstrate that modest radiative cooling can lead to recollimation of a relativistic jet in a nozzle having a very small cross-sectional radius. Such a configuration can produce rapid variability at large distances from the central engine and may explain recent observations of the HST-1 knot in M87. Possible applications of this model to TeV blazars are discussed. We also discuss a scenario for the very rapid TeV flares observed with HESS and MAGIC in some blazars, that accommodates the relatively small Doppler factors inferred from radio observations.

Amir Levinson; Omer Bromberg

2007-12-17T23:59:59.000Z

403

p-CdTe/n-CdS photovoltaic cells in the substrate configuration.  

E-Print Network [OSTI]

??In this thesis, p-CdTe/n-CdS solar cells in the substrate configuration have been studied. The focus is on device fabrication, performance optimization, and the development of (more)

Wu, Hsiang Ning (1984 - )

2014-01-01T23:59:59.000Z

404

Development of high efficieny CdTe thin-film solar cell.  

E-Print Network [OSTI]

??CdTe films were deposited by sputtering technique and were then carried out by CdCl2 treatment. The SEM micrographs show that the grain sizes of the (more)

Huang, Yein-rein

2011-01-01T23:59:59.000Z

405

Stability Issues in Sputtered CdS/CdTe Solar Cells.  

E-Print Network [OSTI]

?? Magnetron sputtering is a well-established thin-film deposition technique which is particularly well-suited for sub-micron layers. We use this method to deposit ultra-thin CdS/CdTe layers (more)

Paudel, Naba Raj

2011-01-01T23:59:59.000Z

406

Studies of sputtered CdTe and CdSe solar cells.  

E-Print Network [OSTI]

??CdTe has recently become the most commercially successful polycrystalline thin filmsolar module material. Its low cost, large-area solar module is reshaping the silicondominatedsolar panel market; (more)

Kwon, Dohyoung

2012-01-01T23:59:59.000Z

407

Development of CdTe thin film solar cells on flexible foil substrates.  

E-Print Network [OSTI]

??Cadmium telluride (CdTe) is a leading thin film photovoltaic (PV) material due to its near ideal band gap of 1.45 eV, its high optical absorption (more)

Hodges, Deidra Ranel

2009-01-01T23:59:59.000Z

408

CdTe/CdS Thin Film Solar Cells Fabricated on Flexible Substrates.  

E-Print Network [OSTI]

??Cadmium Telluride (CdTe) is a leading thin film photovoltaic (PV) material due to its near ideal bandgap of 1.45 eV and its high optical absorption (more)

Palekis, Vasilios

2011-01-01T23:59:59.000Z

409

Photoluminescence and Extended X-ray Absorption Fine Structure Studies on CdTe Material.  

E-Print Network [OSTI]

??The direct-band-gap semiconductor CdTe is an important material for fabricating high efficiency, polycrystalline thin-film solar cells in a heterojunction configuration. The outstanding physical properties of (more)

Liu, Xiangxin

2006-01-01T23:59:59.000Z

410

Electron-reflector strategy for CdTe thin-film solar cells.  

E-Print Network [OSTI]

??The CdTe thin-film solar cell has a large absorption coefficient and high theoretical efficiency. Moreover, large-area photovoltaic panels can be economically fabricated. These features potentially (more)

Hsiao, Kuo-Jui

2010-01-01T23:59:59.000Z

411

Approaches to fabricating high-efficiency ultra-thin CdTe solar cells.  

E-Print Network [OSTI]

??This thesis is an investigation of the fabrication, characterization and performance of high-efficiency and ultra-thin CdTe solar cells with an aim of reducing the material (more)

Xia, Wei (1981 - )

2013-01-01T23:59:59.000Z

412

Room temperature ferromagnetism in Co defused CdTe nanocrystalline thin films  

SciTech Connect (OSTI)

Nanocrystalline Co defused CdTe thin films were prepared using electron beam evaporation technique by depositing CdTe/Co/CdTe stacked layers with different Co thickness onto glass substrate at 373 K followed by annealing at 573K for 2 hrs. Structural, morphological and magnetic properties of of all the Co defused CdTe thin films has been investigated. XRD pattern of all the films exhibited zinc blende structure with <111> preferential orientation without changing the crystal structure of the films. The grain size of the films increased from 31.5 nm to 48.1 nm with the increase of Co layer thickness from 25nm to 100nm. The morphological studies showed that uniform texture of the films and the presence of Co was confirmed by EDAX. Room temperature magnetization curves indicated an improved ferromagnetic behavior in the films with increase of the Co thickness.

Rao, N. Madhusudhana; Kaleemulla, S.; Begam, M. Rigana [Materials Physics Division, School of Advanced Sciences, VIT University, Vellore - 632 014 (India)

2014-04-24T23:59:59.000Z

413

Shunt Passivation Process for CdTe Solar Cell - New Post Deposition Technique.  

E-Print Network [OSTI]

?? A cadmium sulfide / cadmium telluride (CdS/CdTe) solar cell consists of thedevice stack: Glass substrate / SnO2:F (TCO, transparent conductive oxide) / CdS (n-type (more)

Tessema, Misle Mesfin

2009-01-01T23:59:59.000Z

414

Effect of Cu doping on Hole Mobility in CdTe  

SciTech Connect (OSTI)

High quality CdTe thin films grown by laser deposition technique and heavily doped with Cu have recently been reported to have resistivity and hole mobility comparable to those of bulk single crystals. To explain the experimental results we have calculated the effect of Cu on the band structure and phonon spectrum of CdTe using the density functional theory (DFT) and the linearized augmented plane wave (LAPW) method. We found that the introduction of a high density of Cu can lead to a reduction in the hole-LO phonon scattering. In addition, Cu doping can remove Cd vacancies in CdTe and thereby enhance the hole mobility in CdTe.

Ma Zhixun; Mao, Samuel S. [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Liu Lei; Yu, Peter Y. [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Department of Physics, University of California at Berkeley, Berkeley, CA 94720 (United States)

2010-01-04T23:59:59.000Z

415

Efficiency, Cost and Weight Trade-off in TE Power Generation System for Vehicle Exhaust Applications  

Broader source: Energy.gov [DOE]

It contains a detailed co-optimization of the thermoelectric module with the heat sink and a study of the tradeoff between the material cost and efficiency for the TE module and the heat sink. An optimum design is found.

416

The tin impurity in Bi0.5Sb1.5Te3 alloys  

Broader source: Energy.gov [DOE]

Extends work on tin to p-type thermoelectric alloys of formula Bi(2-x)Sb(x)Te(3) doped with Sn. Both single crystals and polycrystals prepared using powder metallurgical techniques are studied and properties reported.

417

TeC: end-user development of software systems for smart spaces  

Science Journals Connector (OSTI)

This paper presents TeC, a framework for end-user design, deployment, and evolution of applications for smart spaces. This work is motivated by the current gap between traditional software development approaches and end user desire to easily personalise and evolve their systems for smart spaces. TeC is precise enough to support the fully automated deployment of systems designed by end users, and it addresses important characteristics of ubiquitous computing, namely, the ability to describe dynamic adaptations and to relate system features to physical location and to the presence and identity of users. TeC is described by example, with four home automation systems concerning surveillance and energy management. The paper also discusses the implementation of the TeC middleware and preliminary evaluation concerning usability and engineering effort.

João P. Sousa; Daniel Keathley; Mong Le; Luan Pham; Daniel Ryan; Sneha Rohira; Samuel Tryon; Sheri Williamson

2011-01-01T23:59:59.000Z

418

Combined SIMS, AES and XPS Study of CdxHg1-xTe  

Science Journals Connector (OSTI)

The ternary compound CdxHg1_xTe is of great importance in infrared technology. The band gap of this material depends critically on the concentration x. Therefore, a detailed knowledge of the surface and bulk comp...

O. Ganschow; H. M. Nitz; L. Wiedmann

1979-01-01T23:59:59.000Z

419

Aqueous Synthesis of Zinc Blende CdTe/CdS Magic-Core/Thick-Shell...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

CdTeCdS Magic-CoreThick-Shell Tetrahedral Shaped Nanocrystals with Emission Tunable to Near-Infrared Authors: Deng, Z., Schulz, O., Lin, S., Ding, B., Liu, X., Wei, X., Ros, R.,...

420

First results on neutrinoless double beta decay of Te-130 with the calorimetric cuoricino experiment  

E-Print Network [OSTI]

Evidence for Neutrinoless Double Beta Decay arXiv:hep-on Evidence for neutrinoless double beta decay- arXiv:hep-Results on Neutrinoless Double Beta Decay of 130 Te with the

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "te grated analy" 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

Surveying The TeV Sky With Milagro G. P. Walker for the Milagro Collaboration  

E-Print Network [OSTI]

Surveying The TeV Sky With Milagro G. P. Walker for the Milagro Collaboration Los Alamos National been reported by the Milagro collaboration [5]. In this analysis, the emission is resolved into regions

California at Santa Cruz, University of

422

Synthesis, characterization and performance of Cd1xInxTe compound for solar cell applications  

E-Print Network [OSTI]

), Tebbin, P.O. Box 87 Helwan, Cairo 11412, Egypt b Department of Physics, University of Central Florida­vis­NIR spectrophotometer and band gap energy of 1.37 eV for Cd0.6In0.4Te was obtained. The best photovoltaic conversion efficiency of 1.89% was obtained for the Cd0.6In0.4Te sample with a short circuit current density (Jsc) of 15

Chow, Lee

423

Simultaneous TE{sub 1} and TE{sub 2} mode lasing yielding dual-wavelength oscillation in a semiconductor laser with a tunnel junction  

SciTech Connect (OSTI)

Dual-frequency oscillation is obtained and investigated in a new type of injection heterolaser, an interband two-stage cascade laser with a tunneling p-n junction separating two active regions with quantum wells located in a common waveguide. The laser design provides for simultaneous oscillation at the first-order TE mode of wavelength {lambda} = 1.086 {mu}m and the second-order TE mode of wavelength {lambda} = 0.96 {mu}m in the continuous-wave regime at room temperature.

Aleshkin, V. Ya., E-mail: aleshkin@ipm.sci.nnov.ru [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation); Babushkina, T. S.; Birykov, A. A. [Nizhni Novgorod State University, Physicotechnical Institute (Russian Federation); Dubinov, A. A. [Russian Academy of Sciences, Institute for Physics of Microstructures (Russian Federation); Zvonkov, B. N.; Kolesnikov, M. N.; Nekorkin, S. M. [Nizhni Novgorod State University, Physicotechnical Institute (Russian Federation)

2011-05-15T23:59:59.000Z

424

CATHODOLUMINESCENCE STUDIES OF THE 1.4 eV BANDS IN CdTe (*) C. B. NORRIS and C. E. BARNES  

E-Print Network [OSTI]

219 CATHODOLUMINESCENCE STUDIES OF THE 1.4 eV BANDS IN CdTe (*) C. B. NORRIS and C. E. BARNESV luminescence bands in nominally undoped, nominally stoichiometric CdTe and in donor-compensated, Te-rich CdTe.4 eV transitions in CdTe arose from the fact that this transition is of a more complex nature than

Paris-Sud XI, Université de

425

Optical Stark Effect and Dressed Exciton States in a Mn-Doped CdTe Quantum Dot C. Le Gall,1  

E-Print Network [OSTI]

Optical Stark Effect and Dressed Exciton States in a Mn-Doped CdTe Quantum Dot C. Le Gall,1 A spin in a CdTe QD, like the strain- induced magnetic anisotropy or hyperfine coupling to the nuclei in this study is grown on a ZnTe substrate and contains CdTe QDs. A 6.5 monolayer thick CdTe layer is deposited

Boyer, Edmond

426

X-ray grating interferometer for materials-science imaging at a low-coherent wiggler source  

Science Journals Connector (OSTI)

X-ray phase-contrast radiography and tomography enable to increase contrast for weakly absorbing materials. Recently x-raygratinginterferometers were developed that extend the possibility of phase-contrast imaging from highly brilliant radiation sources like third-generation synchrotron sources to non-coherent conventional x-ray tube sources. Here we present the first installation of a three gratingx-rayinterferometer at a low-coherence wigglersource at the beamline W2 (HARWI II) operated by the Helmholtz-Zentrum Geesthacht at the second-generation synchrotron storage ring DORIS (DESY Hamburg Germany). Using this type of the wiggler insertion device with a millimeter-sized source allows monochromatic phase-contrast imaging of centimeter sized objects with high photon flux. Thus biological and materials-science imaging applications can highly profit from this imaging modality. The specially designed gratinginterferometer currently works in the photon energy range from 22 to 30 keV and the range will be increased by using adapted x-ray optical gratings. Our results of an energy-dependent visibility measurement in comparison to corresponding simulations demonstrate the performance of the new setup.

Julia Herzen; Tilman Donath; Felix Beckmann; Malte Ogurreck; Christian David; Jrgen Mohr; Franz Pfeiffer; Andreas Schreyer

2011-01-01T23:59:59.000Z

427

DISCOVERY OF A NEW TeV GAMMA-RAY SOURCE: VER J0521+211  

SciTech Connect (OSTI)

We report the detection of a new TeV gamma-ray source, VER J0521+211, based on observations made with the VERITAS imaging atmospheric Cherenkov Telescope Array. These observations were motivated by the discovery of a cluster of >30 GeV photons in the first year of Fermi Large Area Telescope observations. VER J0521+211 is relatively bright at TeV energies, with a mean photon flux of (1.93 0.13{sub stat} 0.78{sub sys}) 10{sup 11} cm{sup 2} s{sup 1} above 0.2 TeV during the period of the VERITAS observations. The source is strongly variable on a daily timescale across all wavebands, from optical to TeV, with a peak flux corresponding to ?0.3 times the steady Crab Nebula flux at TeV energies. Follow-up observations in the optical and X-ray bands classify the newly discovered TeV source as a BL Lac-type blazar with uncertain redshift, although recent measurements suggest z = 0.108. VER J0521+211 exhibits all the defining properties of blazars in radio, optical, X-ray, and gamma-ray wavelengths.

Archambault, S. [Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada); Arlen, T.; Aune, T. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Behera, B.; Federici, S. [DESY, Platanenallee 6, D-15738 Zeuthen (Germany); Beilicke, M.; Buckley, J. H.; Bugaev, V. [Department of Physics, Washington University, St. Louis, MO 63130 (United States); Benbow, W. [Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States); Bird, R. [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Bouvier, A. [Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064 (United States); Byrum, K. [Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439 (United States); Cesarini, A.; Connolly, M. P. [School of Physics, National University of Ireland Galway, University Road, Galway (Ireland); Ciupik, L. [Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States); Cui, W.; Feng, Q.; Finley, J. P. [Department of Physics, Purdue University, West Lafayette, IN 47907 (United States); Errando, M. [Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027 (United States); Falcone, A., E-mail: fortin@veritas.sao.arizona.edu, E-mail: errando@astro.columbia.edu, E-mail: jholder@physics.udel.edu, E-mail: sfegan@llr.in2p3.fr [Department of Astronomy and Astrophysics, 525 Davey Lab, Pennsylvania State University, University Park, PA 16802 (United States); Collaboration: VERITAS Collaboration; and others

2013-10-20T23:59:59.000Z

428

X-ray Studies of Unidentified Galactic TeV Gamma-ray Sources  

SciTech Connect (OSTI)

Many of the recently discovered Galactic TeV sources remain unidentified to date. A large fraction of the sources is possibly associated with relic pulsar wind nebula (PWN) systems. One key question here is the maximum energy (beyond TeV) attained in the compact PWNe. Hard X-ray emission can trace those particles, but current non-focussing X-ray instruments above 10 keV have difficulties to deconvolve the hard pulsar spectrum from its surrounding nebula.Some of the new TeV sources are also expected to originate from middle-aged and possibly even from old supernova remnants (SNR). But no compelling case for such an identification has been found yet. In established young TeV-emitting SNRs, X-ray imaging above 10 keV could help to disentangle the leptonic from the hadronic emission component in the TeV shells, if secondary electrons produced in hadronic collisions can be effectively detected. As SNRs get older, the high energy electron component is expected to fade away. This may allow to verify the picture through X-ray spectral evolution of the source population.Starting from the lessons we have learned so far from X-ray follow-up observations of unidentified TeV sources, prospects for Simbol-X to resolve open questions in this field will be discussed.

Puehlhofer, Gerd [Institut fuer Astronomie und Astrophysik, Sand 1, 72076 Tuebingen (Germany)

2009-05-11T23:59:59.000Z

429

Abundance determinations in HII regions: model fitting versus Te-method  

E-Print Network [OSTI]

The discrepancy between the oxygen abundances in high-metallicity HII regions determined through the Te-method (and/or through the corresponding "strong lines - oxygen abundance" calibration) and that determined through the model fitting (and/or through the corresponding "strong lines - oxygen abundance" calibration) is discussed. It is suggested to use the interstellar oxygen abundance in the solar vicinity, derived with very high precision from the high-resolution observations of the weak interstellar absorption lines towards the stars, as a "Rosetta stone" to verify the validity of the oxygen abundances derived in HII regions with the Te-method at high abundances. The agreement between the value of the oxygen abundance at the solar galactocentric distance traced by the abundances derived in HII regions through the Te-method and that derived from the interstellar absorption lines towards the stars is strong evidence in favor of that i) the two-zone model for Te seems to be a realistic interpretation of the temperature structure within HII regions, and ii) the classic Te-method provides accurate oxygen abundances in HII regions. It has been concluded that the "strong lines - oxygen abundance" calibrations must be based on the HII regions with the oxygen abundances derived with the Te-method but not on the existing grids of the models for HII regions.

L. S. Pilyugin

2002-11-14T23:59:59.000Z

430

Enhanced thermoelectric performance in Cd doped CuInTe{sub 2} compounds  

SciTech Connect (OSTI)

CuIn{sub 1?x}Cd{sub x}Te{sub 2} materials (x?=?0, 0.02, 0.05, and 0.1) are prepared using melting-annealing method and the highly densified bulk samples are obtained through Spark Plasma Sintering. The X-ray diffraction data confirm that nearly pure chalcopyrite structures are obtained in all the samples. Due to the substitution of Cd at In sites, the carrier concentration is greatly increased, leading to much enhanced electrical conductivity and power factor. The single parabolic band model is used to describe the electrical transport properties of CuInTe{sub 2} and the low temperature Hall mobility is also modeled. By combing theoretical model and experiment data, the optimum carrier concentration in CuInTe{sub 2} is proposed to explain the greatly enhanced power factors in the Cd doped CuInTe{sub 2}. In addition, the thermal conductivity is reduced by extra phonon scattering due to the atomic mass and radius fluctuations between Cd and In atoms. The maximum zTs are observed in CuIn{sub 0.98}Cd{sub 0.02}Te{sub 2} and CuIn{sub 0.9}Cd{sub 0.1}Te{sub 2} samples, which are improved by over 100% at room temperature and around 20% at 600?K.

Cheng, N. [State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050 (China); CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050 (China); University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049 (China); Liu, R. [State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050 (China); Bai, S. [CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050 (China); Shi, X., E-mail: xshi@mail.sic.ac.cn; Chen, L. [State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050 (China); CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050 (China)

2014-04-28T23:59:59.000Z

431

Strong lensing probability in TeVeS theory  

E-Print Network [OSTI]

We recalculate the strong lensing probability as a function of the image separation in TeVeS (tensor-vector-scalar) cosmology, which is a relativistic version of MOND (MOdified Newtonian Dynamics). The lens is modeled by the Hernquist profile. We assume an open cosmology with $\\Omega_b=0.04$ and $\\Omega_\\Lambda=0.5$ and three different kinds of interpolating functions. Two different galaxy stellar mass functions (GSMF) are adopted: PHJ (Panter-Heavens-Jimenez, 2004) determined from SDSS data release one and Fontana (Fontana et al., 2006) from GOODS-MUSIC catalog. We compare our results with both the predicted probabilities for lenses by Singular Isothermal Sphere (SIS) galaxy halos in LCDM (lambda cold dark matter) with Schechter-fit velocity function, and the observational results of the well defined combined sample of Cosmic Lens All-Sky Survey (CLASS) and Jodrell Bank/Very Large Array Astrometric Survey (JVAS). It turns out that the interpolating function $\\mu(x)=x/(1+x)$ combined with Fontana GSMF matches the results from CLASS/JVAS quite well.

Da-Ming Chen

2007-12-11T23:59:59.000Z

432

DEVELOPMENT OF CdZnTe RADIATION DETECTORS  

SciTech Connect (OSTI)

Cadmium Zinc Telluride (CdZnTe or CZT) is a very attractive material for room-temperature semiconductor detectors because of its wide band-gap and high atomic number. Despite these advantages, CZT still presents some material limitations and poor hole mobility. In the past decade most of the developing CZT detectors focused on designing different electrode configurations, mainly to minimize the deleterious effect due to the poor hole mobility. A few different electrode geometries were designed and fabricated, such as pixelated anodes and Frisch-grid detectors developed at Brookhaven National Lab (BNL). However, crystal defects in CZT materials still limit the yield of detector-grade crystals, and, in general, dominate the detector's performance. In the past few years, our group's research extended to characterizing the CZT materials at the micro-scale, and to correlating crystal defects with the detector's performance. We built a set of unique tools for this purpose, including infrared (IR) transmission microscopy, X-ray micro-scale mapping using synchrotron light source, X-ray transmission- and reflection-topography, current deep level transient spectroscopy (I-DLTS), and photoluminescence measurements. Our most recent work on CZT detectors was directed towards detailing various crystal defects, studying the internal electrical field, and delineating the effects of thermal annealing on improving the material properties. In this paper, we report our most recent results.

BOLOTNIKOV, A.; CAMARDA, G.; HOSSAIN, A.; KIM, K.H.; YANG, G.; GUL, R.; CUI, Y.; AND JAMES, R.B.

2011-10-23T23:59:59.000Z

433

Note on XMM-Newton observations of the first unidentified TeV gamma-ray source TeV J2032+4130 by Horns et al. astro-ph/0705.0009  

E-Print Network [OSTI]

I comment on the -- apparent -- diffuse X-ray emission reported by Horns et al. in their XMM observations of TeV J2032+4130

Yousaf Butt

2007-05-02T23:59:59.000Z

434

DISCOVERY OF TeV GAMMA-RAY EMISSION FROM CTA 1 BY VERITAS  

SciTech Connect (OSTI)

We report the discovery of TeV gamma-ray emission coincident with the shell-type radio supernova remnant (SNR) CTA 1 using the VERITAS gamma-ray observatory. The source, VER J0006+729, was detected as a 6.5 standard deviation excess over background and shows an extended morphology, approximated by a two-dimensional Gaussian of semimajor (semiminor) axis 0. Degree-Sign 30 (0. Degree-Sign 24) and a centroid 5' from the Fermi gamma-ray pulsar PSR J0007+7303 and its X-ray pulsar wind nebula (PWN). The photon spectrum is well described by a power-law dN/dE = N {sub 0}(E/3 TeV){sup -{Gamma}}, with a differential spectral index of {Gamma} = 2.2 {+-} 0.2{sub stat} {+-} 0.3{sub sys}, and normalization N {sub 0} = (9.1 {+-} 1.3{sub stat} {+-} 1.7{sub sys}) Multiplication-Sign 10{sup -14} cm{sup -2} s{sup -1} TeV{sup -1}. The integral flux, F {sub {gamma}} = 4.0 Multiplication-Sign 10{sup -12} erg cm{sup -2} s{sup -1} above 1 TeV, corresponds to 0.2% of the pulsar spin-down power at 1.4 kpc. The energetics, colocation with the SNR, and the relatively small extent of the TeV emission strongly argue for the PWN origin of the TeV photons. We consider the origin of the TeV emission in CTA 1.

Aliu, E.; Errando, M. [Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027 (United States)] [Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027 (United States); Archambault, S. [Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada)] [Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada); Arlen, T. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)] [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Aune, T.; Bouvier, A. [Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064 (United States)] [Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064 (United States); Beilicke, M.; Buckley, J. H.; Bugaev, V.; Dickherber, R. [Department of Physics, Washington University, St. Louis, MO 63130 (United States)] [Department of Physics, Washington University, St. Louis, MO 63130 (United States); Benbow, W. [Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States)] [Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States); Cesarini, A.; Connolly, M. P. [School of Physics, National University of Ireland Galway, University Road, Galway (Ireland)] [School of Physics, National University of Ireland Galway, University Road, Galway (Ireland); Ciupik, L. [Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States)] [Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States); Collins-Hughes, E. [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland)] [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Cui, W. [Department of Physics, Purdue University, West Lafayette, IN 47907 (United States)] [Department of Physics, Purdue University, West Lafayette, IN 47907 (United States); Duke, C. [Department of Physics, Grinnell College, Grinnell, IA 50112-1690 (United States)] [Department of Physics, Grinnell College, Grinnell, IA 50112-1690 (United States); Dumm, J. [School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 (United States)] [School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 (United States); Dwarkadas, V. V. [Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637 (United States)] [Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637 (United States); Falcone, A., E-mail: muk@astro.columbia.edu, E-mail: smcarthur@ulysses.uchicago.edu [Department of Astronomy and Astrophysics, 525 Davey Lab, Pennsylvania State University, University Park, PA 16802 (United States); and others

2013-02-10T23:59:59.000Z

435

Key experimental information on intermediate-range atomic structures in amorphous Ge2Sb2Te5 phase change material  

E-Print Network [OSTI]

.1063/1.3657139 Nature of phase transitions in crystalline and amorphous GeTe-Sb2Te3 phase change materials J. Chem. Phys on intermediate-range atomic structures in amorphous Ge2Sb2Te5 phase change material Shinya Hosokawa,1,2,a) Wolf change material Shinya Hosokawa, Wolf-Christian Pilgrim, Astrid Höhle, Daniel Szubrin, Nathalie Boudet

Paris-Sud XI, Université de

436

DETERMINATION OF BACK CONTACT BARRIER HEIGHT IN Cu(In,Ga)(Se,S)2 AND CdTe SOLAR CELLS  

E-Print Network [OSTI]

DETERMINATION OF BACK CONTACT BARRIER HEIGHT IN Cu(In,Ga)(Se,S)2 AND CdTe SOLAR CELLS Galymzhan T to quantify the energy barrier for holes between a Cu(In,Ga)(Se,S)2 (CIGSeS) or CdTe absorber and the back effectively kill the performance of the cell. Many CIGSeS and CdTe cells, however, do have a back

Sites, James R.

437

X-RAY ESCAPE PEAK VARIATIONS IN DIODES MADE FROM DOUBLY TRAVELLING SOLVENT GROWN p-TYPE CdTe  

E-Print Network [OSTI]

293 X-RAY ESCAPE PEAK VARIATIONS IN DIODES MADE FROM DOUBLY TRAVELLING SOLVENT GROWN p-TYPE CdTe H On a étudié la variation de l'intensité du pic d'échappement d'un compteur CdTe en fonction de la tension de height on the applied diode voltage was measured at diodes made from doubly travelling solvent grown CdTe

Paris-Sud XI, Université de

438

COMPARATIVE STUDY OF CdTe AND GaAs PHOTOREFRACTIVE PERFORMANCES FROM 1m TO 1.55m  

E-Print Network [OSTI]

1 COMPARATIVE STUDY OF CdTe AND GaAs PHOTOREFRACTIVE PERFORMANCES FROM 1µm TO 1.55µm L.A. de CdTe at different wavelengths from 1.06µm to 1.55µm. The sensitivity and performances of different for the extension of the photorefractive effect towards the wavelength region of 1.3-1.5µm. CdTe appears

Paris-Sud XI, Université de

439

Growth of CdTe Films on Amorphous Substrates Using CaF2 Nanorods as a Buffer Layer  

E-Print Network [OSTI]

Growth of CdTe Films on Amorphous Substrates Using CaF2 Nanorods as a Buffer Layer NICHOLAS LICAUSI biaxially textured CdTe films were grown on biaxial CaF2 buffer layers. The CaF2 nanorods were grown by oblique angle vapor deposition and possessed a {111}h121i biaxial texture. The CdTe film was deposited

Wang, Gwo-Ching

440

REVIEW OF CdTe MEDICAL APPLICATIONS Radiation Monitoring Devices, Inc. 44 Hunt St., Watertown, Massachusetts 02172, U. S. A.  

E-Print Network [OSTI]

REVIEW OF CdTe MEDICAL APPLICATIONS G. ENTINE Radiation Monitoring Devices, Inc. 44 Hunt St place de dents synthé- tiques. Par ailleurs, les détecteurs CdTe ont été utilisés pour le diagnostic d développer des photo- conducteurs X à base de CdTe pour les tomo-densitomètres ; toutefois, des progrès

Paris-Sud XI, Université de

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441

Epitaxial growth of CdTe oriented thin films, infrared characterization and possible applications to photo-voltaic cells  

E-Print Network [OSTI]

573 Epitaxial growth of CdTe oriented thin films, infrared characterization and possible décembre 1979, accepté le 12 décembre 1979) Résumé. 2014 Des films minces orientés de CdTe, d de CdTe cubique dont la face (111), polie mécaniquement et décapée chimiquement, est préalablement

Paris-Sud XI, Université de

442

CONTRIBUTION TO THE DETERMINATION OF DEEP TRAPPING LEVELS IN HIGH RESISTIVITY FILMS OF n-TYPE CdTe  

E-Print Network [OSTI]

-TYPE CdTe C. LHERMITTE, D. CARLES and C. VAUTIER Laboratoire de Physique des couches minces, Faculté des conduction à l'obscurité et de la photoconductivité des couches minces de CdTe de type n nous permet de and the photoconductivity of n-type CdTe films enables us to emphasize the existence of a distribution of traps located

Boyer, Edmond

443

The Roles of Cu Impurity States in CdTe Thin Film Solar Cells Ken K. Chin1  

E-Print Network [OSTI]

1 The Roles of Cu Impurity States in CdTe Thin Film Solar Cells Ken K. Chin1 , T.A. Gessert2 of Cu impurity inclusion in CdTe thin film solar cells, such as degradation caused by Cu diffusion , and Su-Huai Wei2 1 Department of Physics and Apollo CdTe Solar Energy Research Center, NJIT, Newark, NJ

444

A Search for a Light Charged Higgs Boson Decaying to cs at ?s = 7 TeV.  

E-Print Network [OSTI]

??A search for a light charged Higgs boson decaying into cs is presented using data recorded in pp collisions at ?s = 7 TeV. The (more)

Martyniuk, Alex Christopher

2011-01-01T23:59:59.000Z

445

De herontwikkeling van het DSM terrein; naar een strategisch advies voor de ontwikkeling van het DSM terrein te Delft :.  

E-Print Network [OSTI]

??Het doel van het onderzoek is het traceren van het (bewust of onbewust) gevolgde strategisch proces voor de herontwikkeling van het DSM terrein te Delft, (more)

Schellekens, F.P.

2013-01-01T23:59:59.000Z

446

Calcul de la variation de mobilit des lectrons dans PbTe type n entre 50 et 300 K  

E-Print Network [OSTI]

, Classification Physics Abstracts 72.20F 1. Introduction. Les chalcog6nures tel le tellurure de plomb (PbTe) sont

Paris-Sud XI, Université de

447

Exploring alternative symmetry breaking mechanisms at the LHC with 7, 8 and 10 TeV total energy  

E-Print Network [OSTI]

In view of the annnouncement that in 2012 the LHC will run at 8 TeV, we study the possibility of detecting signals of alternative mechanisms of ElectroWeak Symmetry Breaking, described phenomenologically by unitarized models, at energies lower than 14 TeV. A complete calculation with six fermions in the final state is performed using the PHANTOM event generator. Our results indicate that at 8 TeV some of the scenarios with TeV scale resonances are likely to be identified while models with no resonances or with very heavy ones will be inaccessible, unless the available luminosity will be much higher than expected.

Alessandro Ballestrero; Diogo Buarque Franzosi; Ezio Maina

2012-03-13T23:59:59.000Z

448

Damage Detection of CFRP Plates by Full-Spectral Analysis of a Fibre Bragg Grating Sensor Signal  

SciTech Connect (OSTI)

This paper describes the measurement of average strain, strain distribution and vibration of cantilever beam made of Carbon Fiber Reinforced Plastics (CFRP), using a single Fibre Bragg Grating (FBG) sensor mounted on the beam surface. Average strain is determined from the displacement of the peak wavelength of reflected light from the FBG sensor. Unstrained reference FBG sensors were used to compensate for temperature drift and the photoelastic coefficient (P{sub e}), which was used to calculate the gauge factor. Measured strains agree with those measured by a resistance foil strain gauge attached to the sample. Stress distributions are measured by monitoring the variation in the full width half maximum (FWHM) values of the reflected spectrum, using a proposed optical analytical model, described in the paper. FWHM values were measured for both the cantilever test beam and a for a reference beam, loaded using a four-point bending rig. The trend of the stress distribution for the test beam matches with our analytical model, however with a relatively large noise present in the experimentally determined data. The vibration of cantilever beam was measured by temporal analysis of the peak reflection wavelength. This technique is very stable as measurements are not affected by variations in the signal amplitude. Finally an application of FBG sensors for damage detection of CFRP plates is demonstrated, by measuring the average strain and natural frequency. With small defects of different sizes applied to the CFRP plate, average strains were seen to increase with damage size and the natural frequency decreased with damage size.

Mizutani, Yoshihiro [Optical Non-Destructive Testing Laboratory, Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2600 GB Delft (Netherlands); Solid and Structures Engineering Laboratory, Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, Japan, 2-12-1-I1-70, Ookayama, Meguro-ku, Tokyo 152-8552 (Japan); Groves, Roger M. [Optical Non-Destructive Testing Laboratory, Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2600 GB Delft (Netherlands)

2010-05-28T23:59:59.000Z

449

Commissioning of a Soft X-ray Beamline PF-BL-16A with a Variable-Included-Angle Varied-Line-Spacing Grating Monochromator  

SciTech Connect (OSTI)

The design and commissioning of a new soft X-ray beamline, BL-16A, at the Photon Factory is presented. The beamline consists of a pre-focusing mirror, an entrance slit, a variable-included-angle varied-line-spacing plane grating monochromator, and a post-focusing system as usual, and provides circularly and linearly polarized soft X rays in the energy range 200-1500 eV with an APPLE-II type undulator. The commissioning procedure for the beamline optics is described in detail, especially the check of the focal position for the zero-th order and diffracted X rays.

Amemiya, Kenta; Toyoshima, Akio; Kikuchi, Takashi; Kosuge, Takashi; Nigorikawa, Kazuyuki; Sumii, Ryohei; Ito, Kenji [Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801 (Japan)

2010-06-23T23:59:59.000Z

450

High precision in-cylinder gas thermometry using Laser Induced Gratings: Quantitative measurement of evaporative cooling with gasoline/alcohol blends in a GDI optical engine  

Science Journals Connector (OSTI)

Abstract The first application of Laser Induced Thermal Gratings Spectroscopy (LITGS) for precision thermometry in a firing GDI optical engine is reported. Crank-angle resolved temperature values were derived from LITGS signals generated in fuel vapour with a pressure dependent precision in the range 0.11.0% allowing differences in evaporative or charge cooling effects arising from a variety of ethanol and methanol blends with a model gasoline fuel to be quantified. In addition, fluctuations in temperature arising from cyclic variations in compression were directly detected and measured.

Ben Williams; Megan Edwards; Richard Stone; John Williams; Paul Ewart

2014-01-01T23:59:59.000Z

451

Abidjan, Côte d'Ivoire: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Abidjan, Côte d'Ivoire: Energy Resources Abidjan, Côte d'Ivoire: Energy Resources Jump to: navigation, search Name Abidjan, Côte d'Ivoire Equivalent URI DBpedia GeoNames ID 2293538 Coordinates 5.341111°, -4.028056° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":5.341111,"lon":-4.028056,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

452

Suzanne G.E. te Velthuis - Argonne National Laboratories, Materials Sicence  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

NXRS > Suzanne G.E. te Velthuis NXRS > Suzanne G.E. te Velthuis Suzanne G.E. te Velthuis Physicist Bldg. 223, B-205 Phone 630-252-1075 This e-mail address is being protected from spambots. You need JavaScript enabled to view it. Quick Links Selected Publications Selected Invited Talks Present Position Physicist, Materials Science Division, Argonne National Laboratory (2005-Present). Education Ph.D. Degree, Deft University of Technology, The Netherlands (1999). Masters Degree in Applied Physics, Eindhoven University of Technology, The Netherlands (1993). Professional Expirence Assistant Scientist, Materials Science Division, Argonne National Laboratory, (2001-2005). Post-doctoral Scientist, Intense Pulsed Neutron Source, Argonne National Laboratory (1999-2001). Researcher in training (leading to PhD degree), Delft University of Technology, The Netherlands (1994 -1998).

453

Energy spectrum of charge carriers in Ag{sub 2}Te  

SciTech Connect (OSTI)

On the basis of investigations of the temperature and concentration dependences of kinetic coefficients (the Hall coefficientR, the electrical conductivity {sigma}, and thermopower {alpha}{sub 0}) in n-type Ag{sub 2}Te, it is established that Ag atoms in Ag{sub 2}Te create the shallow donor levels located at a distance of (0.002-7 x 10{sup -5}T) eV from the bottom of the conduction band. It is shown that silver telluride has n-type conductivity starting with the deficiency of Ag {>=} 0.01 at % in the stoichiometric composition, and it is practically impossible to achieve the stoichiometric composition in Ag{sub 2}Te.

Aliev, F. F., E-mail: farzali@physics.ab.az; Jafarov, M. B. [Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan)

2008-11-15T23:59:59.000Z

454

Optical characteristics of pulsed laser deposited Ge-Sb-Te thin films studied by spectroscopic ellipsometry  

SciTech Connect (OSTI)

Pulsed laser deposition technique was used for the fabrication of (GeTe){sub 1-x}(Sb{sub 2}Te{sub 3}){sub x} (x = 0, 0.33, 0.50, 0.66, and 1) amorphous thin films. Scanning electron microscopy with energy-dispersive x-ray analysis, x-ray diffraction, optical reflectivity, and sheet resistance temperature dependences as well as variable angle spectroscopic ellipsometry measurements were used to characterize as-deposited (amorphous) and annealed (rocksaltlike) layers. In order to extract optical functions of the films, the Cody-Lorentz model was applied for the analysis of ellipsometric data. Fitted sets of Cody-Lorentz model parameters are discussed in relation with chemical composition and the structure of the layers. The GeTe component content was found to be responsible for the huge optical functions and thickness changes upon amorphous-to-fcc phase transition.

Nemec, P. [Department of Graphic Arts and Photophysics, Faculty of Chemical Technology, University of Pardubice, Studentska 573, 53210 Pardubice (Czech Republic); Prikryl, J.; Frumar, M. [Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 573, 53210 Pardubice (Czech Republic); Nazabal, V. [Equipe Verres et Ceramiques, UMR-CNRS 6226, Sciences Chimiques de Rennes (SCR), Universite de Rennes 1, 35042 Rennes Cedex (France)

2011-04-01T23:59:59.000Z

455

Diffuse neutrinos from extragalactic supernova remnants: Dominating the 100 TeV IceCube flux  

E-Print Network [OSTI]

IceCube has measured a diffuse astrophysical flux of TeV-PeV neutrinos. The most plausible sources are unique high energy cosmic ray accelerators like hypernova remnants (HNRs) and remnants from gamma ray bursts in star-burst galaxies, which can produce primary cosmic rays with the required energies and abundance. In this case, however, ordinary supernova remnants (SNRs), which are far more abundant than HNRs, produce a comparable or larger neutrino flux in the ranges up to 100-150 TeV energies, implying a spectral break in the IceCube signal around these energies. The SNRs contribution in the diffuse flux up to these hundred TeV energies provides a natural baseline and then constrains the expected PeV flux.

Chakraborty, Sovan

2015-01-01T23:59:59.000Z

456

Phase assembly and photo-induced current in CdTe-ZnO nanocomposite thin films  

SciTech Connect (OSTI)

Sequential radio-frequency sputtering was used to produce CdTe-ZnO nanocomposite thin films with varied semiconductor-phase extended structures. Control of the spatial distribution of CdTe nanoparticles within the ZnO embedding phase was used to influence the semiconductor phase connectivity, contributing to both changes in quantum confinement induced spectral absorption and carrier transport characteristics of the resulting nanocomposite. An increased number density of CdTe particles deposited along the applied field direction produced an enhancement in the photo-induced current observed. These results highlight the opportunity to employ long-range phase assembly as a means to control optoelectronic properties of significant interest for photovoltaic applications.

Beal, R. J.; Kana Kana, J. B. [Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona 85721 (United States); Potter, B. G. Jr. [Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona 85721 (United States); College of Optical Sciences, University of Arizona, Tucson, Arizona 85721 (United States)

2012-07-16T23:59:59.000Z

457

Layer-by-Layer Assembly of Sintered CdSexTe1x Nanocrystal Solar Cells  

Science Journals Connector (OSTI)

solar cell; nanocrystal; CdTe; CdSexTe1?x; layer-by-layer; solution-processed; sintered ... For instance, devices fabricated using cadmium telluride (CdTe) and copper indium gallium selenide (CIGS) based active layers have exhibited laboratory scale power conversion efficiencies up to 17.3%(1) and 20.3%,(2) respectively, at commercial production costs as low as US $0.75/Watt. ... (20) More recently, the graded device concept has been extended to solution-processed organic solar cells, through a series of complementary donor materials(21) and to PbS quantum dot devices, where bandgap grading was accomplished through variation of the QD diameter. ...

Brandon I. MacDonald; Alessandro Martucci; Sergey Rubanov; Scott E. Watkins; Paul Mulvaney; Jacek J. Jasieniak

2012-06-12T23:59:59.000Z

458

Testing the plutonium isotopic analysis code FRAM with various CdTe detectors.  

SciTech Connect (OSTI)

The isotopic analysis code Fixed-energy Response-function Analysis with Multiple efficiency (FRAM)1,2 has been proven to successfully analyze plutonium spectra taken with a portable CdTe detector with Peltier cooling, the first results of this kind for a noncryogenic detector.3 These are the first wide-range plutonium gamma-ray isotopics analysis results obtained with other than Ge spectrometers. The CdTe spectrometer measured small plutonium reference samples in reasonable count times, covering the range from low to high burnup. This paper describes further testing of FRAM with two CdTe detectors of different sizes and resolutions using different analog and digital, portable multichannel analyzers (MCAs).

Vo, Duc T.; Russo, P. A. (Phyllis A.)

2002-01-01T23:59:59.000Z

459

Hybrid model of GeV-TeV gamma ray emission from Galactic Center  

E-Print Network [OSTI]

The observations of high energy $\\gamma$-ray emission from the Galactic center (GC) by HESS, and recently by Fermi, suggest the cosmic ray acceleration in the GC and possibly around the supermassive black hole. In this work we propose a lepton-hadron hybrid model to explain simultaneously the GeV-TeV $\\gamma$-ray emission. Both electrons and hadronic cosmic rays were accelerated during the past activity of the GC. Then these particles would diffuse outwards and interact with the interstellar gas and background radiation field. The collisions between hadronic cosmic rays with gas is responsible to the TeV $\\gamma$-ray emission detected by HESS. With fast cooling in the strong radiation field, the electrons would cool down and radiate GeV photons through inverse Compton scattering off the soft background photons. This scenario provides a natural explanation of the observed GeV-TeV spectral shape of $\\gamma$-rays.

Yi-Qing Guo; Qiang Yuan; Cheng Liu; Ai-Feng Li

2014-09-14T23:59:59.000Z

460

Retrospective Analysis (1998-2011) of the Mutton Snapper (Lutjanus analis) Landings  

E-Print Network [OSTI]

Caye, Gladden Spit & Silk Cayes Marine Reserve, Belize Executive Report By Pablo Granados-Dieseldorff Applied Biodiversity Science NSF-IGERT Doctoral Program Department of Geography Texas A&M University internship in fulfillment of an international conservation exercise for the Applied Biodiversity Science (ABS

Note: This page contains sample records for the topic "te grated analy" 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.


461

Skerhetstnkandet i Finland och Estland p 2000-talet - en jmfrande analys.  

E-Print Network [OSTI]

??Avsikten med denna pro gradu-avhandling var att underska hur den officiella skerhetspolitiken presenteras och artikuleras. Forskningsfrgan var fljande: Hur har skerheten artikulerats i Finland respektive (more)

Kotka-Bystedt, Anna

2006-01-01T23:59:59.000Z

462

E-Print Network 3.0 - analys med fokus Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Information Sciences 100 I. Projektinformation Projekttitel Summary: mulighederne for BIPV. Primrt i mindre skala og ikke udelukkende med fokus p, at det skulle vre i......

463

.' .~ J.:'Arh ApplkAflnn Analy&h SBand Trnntittt'r  

E-Print Network [OSTI]

documents the Parts Application Analysis (PAA) performed on the Data Transmitter and its Telemetry circuitry in the attached PAA worksheets refer to one Transmitter only. The PAA data show that all Transmitter electronicHis (PAA) has been updated to reflect the modifications to the Data Transmitter circuit since the original

Rathbun, Julie A.

464

Charge transport properties of p-CdTe/n-CdTe/n{sup +}-Si diode-type nuclear radiation detectors based on metalorganic vapor-phase epitaxy-grown epilayers  

SciTech Connect (OSTI)

Charge transport properties of p-CdTe/n-CdTe/n{sup +}-Si diode-type nuclear radiation detectors, fabricated by growing p-and n-type CdTe epilayers on (211) n{sup +}-Si substrates using metalorganic vapor-phase epitaxy (MOVPE), were studied by analyzing current-voltage characteristics measured at various temperatures. The diode fabricated shows good rectification properties, however, both forward and reverse biased currents deviate from their ideal behavior. The forward current exhibits typical feature of multi-step tunneling at lower biases; however, becomes space charge limited type when the bias is increased. On the other hand, the reverse current exhibits thermally activated tunneling-type current. It was found that trapping centers at the p-CdTe/n-CdTe junction, which were formed due to the growth induced defects, determine the currents of this diode, and hence limit the performance of the nuclear radiation detectors developed.

Niraula, M.; Yasuda, K.; Wajima, Y.; Yamashita, H.; Tsukamoto, Y.; Suzuki, Y.; Matsumoto, M.; Takai, N.; Tsukamoto, Y.; Agata, Y. [Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555 (Japan)] [Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555 (Japan)

2013-10-28T23:59:59.000Z

465

Ionic conductivity and dielectric relaxation in {gamma}-irradiated TlGaTe{sub 2} crystals  

SciTech Connect (OSTI)

The switching effect, field and temperature dependences of the permittivity and conductivity of TlGaTe{sub 2} crystals subjected to various {gamma}-irradiation doses are studied. Under rather low electric fields, the phenomenon of threshold switching with an S-shaped current-voltage characteristic containing a portion with negative differential resistance is observed in the crystals. In the region of critical voltages, current and voltage oscillations and imposed modulation are observed. Possible mechanisms of switching, ionic conductivity, disorder, and electrical instability in TlGaTe{sub 2} crystals are discussed.

Sardarli, R. M., E-mail: sardarli@yahoo.com; Samedov, O. A.; Abdullayev, A. P. [National Academy of Sciences of Azerbaijan, Institute of Radiation Problems (Azerbaijan); Huseynov, E. K. [National Academy of Sciences of Azerbaijan, Institute of Physics (Azerbaijan); Salmanov, F. T.; Alieva, N. A.; Agaeva, R. Sh. [National Academy of Sciences of Azerbaijan, Institute of Radiation Problems (Azerbaijan)

2013-05-15T23:59:59.000Z

466

Measurement of Dijet Azimuthal Decorrelations in pp Collisions at {radical}(s)=7 TeV  

SciTech Connect (OSTI)

Azimuthal decorrelations between the two central jets with the largest transverse momenta are sensitive to the dynamics of events with multiple jets. We present a measurement of the normalized differential cross section based on the full data set ({integral}Ldt=36 pb{sup -1}) acquired by the ATLAS detector during the 2010 {radical}(s)=7 TeV proton-proton run of the LHC. The measured distributions include jets with transverse momenta up to 1.3 TeV, probing perturbative QCD in a high-energy regime.

Aad, G.; Ahles, F.; Beckingham, M.; Bernhard, R.; Bitenc, U.; Bruneliere, R.; Caron, S.; Carpentieri, C.; Christov, A.; Dahlhoff, A.; Dietrich, J.; Eckert, S.; Fehling-Kaschek, M.; Flechl, M.; Glatzer, J. [Fakultaet fuer Mathematik und Physik, Albert-Ludwigs-Universitaet, Freiburg i.Br. (Germany); Abbott, B. [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman Oklahoma (United States); Abdallah, J.; Bosman, M.; Casado, M. P.; Cavalli-Sforza, M. [Institut de Fisica d'Altes Energies and Universitat Autonoma de Barcelona and ICREA, Barcelona (Spain)

2011-04-29T23:59:59.000Z

467

Improvement of the energy resolution of CdTe detectors by pulse height correction from waveform  

E-Print Network [OSTI]

Semiconductor detectors made of CdTe crystal have high gamma-ray detection efficiency and are usable at room temperature. However, the energy resolution of CdTe detectors for MeV gamma-rays is rather poor because of the significant hole trapping effect. We have developed a method to improve the energy resolution by correcting the pulse height using the waveform of the signal and achieved 2.0% (FWHM) energy resolution for 662keV gamma-rays. Best energy resolution was achieved at temperatures between -10 degrees C and 0 degrees C.

Kikawa, T; Hiraki, T; Nakaya, T

2011-01-01T23:59:59.000Z

468

Improvement of the energy resolution of CdTe detectors by pulse height correction from waveform  

E-Print Network [OSTI]

Semiconductor detectors made of CdTe crystal have high gamma-ray detection efficiency and are usable at room temperature. However, the energy resolution of CdTe detectors for MeV gamma-rays is rather poor because of the significant hole trapping effect. We have developed a method to improve the energy resolution by correcting the pulse height using the waveform of the signal and achieved 2.0% (FWHM) energy resolution for 662keV gamma-rays. Best energy resolution was achieved at temperatures between -10 degrees C and 0 degrees C.

T. Kikawa; A. K. Ichikawa; T. Hiraki; T. Nakaya

2011-12-21T23:59:59.000Z

469

Ultrahigh Energy Cosmic Rays and Prompt TeV Gamma Rays from Gamma Ray Bursts  

E-Print Network [OSTI]

Gamma Ray Bursts (GRBs) have been proposed as one {\\it possible} class of sources of the Ultrahigh Energy Cosmic Ray (UHECR) events observed up to energies $\\gsim10^{20}\\ev$. The synchrotron radiation of the highest energy protons accelerated within the GRB source should produce gamma rays up to TeV energies. Here we briefly discuss the implications on the energetics of the GRB from the point of view of the detectability of the prompt TeV gamma rays of proton-synchrotron origin in GRBs in the up-coming ICECUBE muon detector in the south pole.

Pijushpani Bhattacharjee; Nayantara Gupta

2003-05-12T23:59:59.000Z

470

A search for neutrinoless double beta decay of 130Te with a low temperature calorimeter  

Science Journals Connector (OSTI)

Possible impacts of the bolometric technique on Neutrinoless Double Beta Decay (0??DVD) search are discussed. In this approach the performances of two TeO2 low temperature calorimeters with masses of 73 g and 340 g are reported: the FWHM resolutions are respectively 6 keV and 20 keV at 2614 keV. The operation of these detectors in a low background environment in the Gran Sasso underground laboratory has allowed to set a limit on the half?life of 130Te 2??DBD of about 2.51021 and to study the residual radioactive background components.

A. Alessandrello; C. Brofferio; D. V. Camin; O. Cremonesi; G. Gervasio; E. Fiorini; A. Giuliani; M. Pavan; G. Pessina; E. Previtali; L. Zanotti

1992-01-01T23:59:59.000Z

471

Shubnikov-de Haas Oscillations in the Bulk Rashba Semiconductor BiTeI  

SciTech Connect (OSTI)

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

472

Use of a capillary X-ray focused beam to investigate the chemical composition of CdZnTe wafers with high resolution CdZnTe detectors  

SciTech Connect (OSTI)

The control of the concentration of Zn and its fluctuation in the high pressure Bridgman grown CdZnTe crystals is part of the characterization work on the ternary grown ingots grown in house. In order to reach both high sensitivity and high position resolution, the authors have developed a new system consisting of a X-ray generator, coupled to a focusing X-ray capillary, delivering intense beams in the micron scale, since the intensity gain is around a factor of 100 compared to conventional methods. The characteristic X-rays are measured through a high resolution CdZnTe detector (225 eV at 5.9 keV FWHM) cooled by a Peltier system. The results of the investigations on different kinds of crystals will be discussed.

Fougeres, P. [EURORAD, Strasbourg (France); Burggraf, Ch.; Burggraf, Chr.; Koebel, J.M.; Regal, R.; Hage-Ali, M.; Krauth, A.; Siffert, P. [CNRS, Strasbourg (France). Lab. PHASE; Koenig, C. [Univ. Louis Pasteur, Schiltigheim (France)

1998-12-31T23:59:59.000Z

473

Obtaining and investigation of Pb1-xMnxTe(Se, S) semimagnetic semiconductor nanolayers sesitive to infrared rays  

Science Journals Connector (OSTI)

In the given work the energy spectrum and wave functions have been theoretically calculated for quantum-sized films of Pb1-xMnxTe (Se,S) semimagnetic semiconductors. The photo-and electroluminescence properties of Pb1-xMnxTe ... Keywords: detector, electroluminescence, energy spectrum, infrared, nanolayer, photoluminescence, semimagnetic semiconductor, sensitive

M. A. Mehrabova; I. R. Nuriyev; R. M. Mamishova; T. I. Kerimova

2011-11-01T23:59:59.000Z

474

Search for resonances in the dijet mass spectrum from 7 TeV pp collisions at CMS  

E-Print Network [OSTI]

A search for narrow resonances with a mass of at least 1 TeV in the dijet mass spectrum is performed using pp collisions at ?s = 7 TeV corresponding to an integrated luminosity of 1 fb[superscript ?1], collected by the CMS ...

CMS Collaboration

475

The effect of impurities on the doping and VOC of CdTe/CdS thin film solar cells  

Science Journals Connector (OSTI)

The effect of introducing impurities in CdTe, namely antimony (Sb) and oxygen (O), on the net carrier concentration in CdS/CdTe solar cells and on their open-circuit voltage (VOC) has been investigated. Oxygen was introduced in the CdTe films during the deposition of this layer by the close-spaced sublimation process. The total pressure was held constant at 1330Pa (N2 and O2). The amount of oxygen was varied by varying its partial pressure. Antimony was introduced into CdTe using a post-deposition diffusion process. Following the deposition of CdTe a thin film (a few nm) of Sb was deposited onto the CdTe surface and subsequently heat-treated to cause in-diffusion of Sb. The temperature and time during the diffusion process were varied in the range of 300525C and 20160min respectively. In both instances it was possible to vary (increase) the doping concentration in CdTe. The increase in doping was accompanied by an increase in VOC. However, in all instances the doping in CdTe reached a maximum value, beyond which further increases were not possible leading to saturation in VOC. The highest VOC measured was similar to state-of-the-art values in the range of 800830mV, and the highest doping concentration measured was in the 1016cm?3 range.

H. Zhao; Alvi Farah; D. Morel; C.S. Ferekides

2009-01-01T23:59:59.000Z

476

PHOTOREFRACTIVE RESPONSE OF CdTe:V UNDER AC ELECTRIC FIELD FROM 1 TO 1.5m  

E-Print Network [OSTI]

for the extension of the photorefractive effect towards the wavelength region of 1.3-1.5µm. Cadmium Telluride (CdTe conduction (hole-electron competition). Sample and experimental set-up presentations : The CdTe sample we

477

Cadmium sulfate and CdTe-quantum dots alter DNA repair in zebrafish (Danio rerio) liver cells  

SciTech Connect (OSTI)

Increasing use of quantum dots (QDs) makes it necessary to evaluate their toxicological impacts on aquatic organisms, since their contamination of surface water is inevitable. This study compares the genotoxic effects of ionic Cd versus CdTe nanocrystals in zebrafish hepatocytes. After 24 h of CdSO{sub 4} or CdTe QD exposure, zebrafish liver (ZFL) cells showed a decreased number of viable cells, an accumulation of Cd, an increased formation of reactive oxygen species (ROS), and an induction of DNA strand breaks. Measured levels of stress defense and DNA repair genes were elevated in both cases. However, removal of bulky DNA adducts by nucleotide excision repair (NER) was inhibited with CdSO{sub 4} but not with CdTe QDs. The adverse effects caused by acute exposure of CdTe QDs might be mediated through differing mechanisms than those resulting from ionic cadmium toxicity, and studying the effects of metallic components may be not enough to explain QD toxicities in aquatic organisms. - Highlights: Both CdSO{sub 4} and CdTe QDs lead to cell death and Cd accumulation. Both CdSO{sub 4} and CdTe QDs induce cellular ROS generation and DNA strand breaks. Both CdSO{sub 4} and CdTe QDs induce the expressions of stress defense and DNA repair genes. NER repair capacity was inhibited with CdSO{sub 4} but not with CdTe QDs.

Tang, Song; Cai, Qingsong [The Institute of Environmental and Human Health, Texas Tech University, Lubbock, TX 79416 (United States); Chibli, Hicham [Department of Biomedical Engineering, McGill University, Montral, QC H3A 2B4 (Canada); Allagadda, Vinay [The Institute of Environmental and Human Health, Texas Tech University, Lubbock, TX 79416 (United States); Nadeau, Jay L. [Department of Biomedical Engineering, McGill University, Montral, QC H3A 2B4 (Canada); Mayer, Gregory D., E-mail: greg.mayer@ttu.edu [The Institute of Environmental and Human Health, Texas Tech University, Lubbock, TX 79416 (United States)

2013-10-15T23:59:59.000Z

478

STRUCTURAL AND CHEMICAL STUDIES ON CdTe/CdS THIN FILM SOLAR CELLS WITH ANALYTICAL TRANSMISSION ELECTRON MICROSCOPY  

E-Print Network [OSTI]

STRUCTURAL AND CHEMICAL STUDIES ON CdTe/CdS THIN FILM SOLAR CELLS WITH ANALYTICAL TRANSMISSION, A. N. Tiwari Thin Film Physics Group, Laboratory for Solid State Physics, Technopark ETH-Building, Technoparkstr. 1, CH-8005 Zurich, Switzerland ABSTRACT: CdTe/CdS thin £lm solar cells have been grown by closed

Romeo, Alessandro

479

Sonochemical and hydrothermal synthesis of PbTe nanostructures with the aid of a novel capping agent  

SciTech Connect (OSTI)

Graphical abstract: - Highlights: PbTe nanostructures were prepared with the aid of Schiff-base compound. Sonochemical and hydrothermal methods were employed to fabricate PbTe nanostrucrues. The effect of preparation parameters on the morphology of PbTe was investigated. - Abstract: In this work, a new Schiff-base compound derived from 1,8-diamino-3,6-dioxaoctane and 2-hydroxy-1-naphthaldehyde marked as (2-HyNa)-(DaDo) was synthesized, characterized, and then used as capping agent for the preparation of PbTe nanostructures. To fabricate PbTe nanostructures, two different synthesis methods; hydrothermal and sonochemical routes, were applied. To further investigate, the effect of preparation parameters like reaction time and temperature in hydrothermal synthesis and sonication time in the presence of ultrasound irradiation on the morphology and purity of the final products was tested. The products were analyzed with the aid of SEM, TEM, XRD, FT-IR, and EDS. Based on the obtained results, it was found that pure cubic phased PbTe nanostructures have been obtained by hydrothermal and sonochemical approaches. Besides, SEM images showed that cubic-like and rod-like PbTe nanostructures have been formed by hydrothermal and sonochemical methods, respectively. Sonochemical synthesis of PbTe nanostructures was favorable, because the synthesis time of sonochemical method was shorter than that of hydrothermal method.

Fard-Fini, Shahla Ahmadian [Department of Chemistry, Payame Noor University, P.O. Box 19395-3697, Tehran, Islamic Republic of Iran (Iran, Islamic Republic of); Salavati-Niasari, Masoud, E-mail: salavati@kashanu.ac.ir [Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, P.O. Box 87317-51167, Kashan, Islamic Republic of Iran (Iran, Islamic Republic of); Institute of Nano Science and Nano Technology, University of Kashan, P.O. Box 87317-51167, Kashan, Islamic Republic of Iran (Iran, Islamic Republic of); Mohandes, Fatemeh [Department of Inorganic Chemistry, Faculty of Chemistry, University of Kashan, P.O. Box 87317-51167, Kashan, Islamic Republic of Iran (Iran, Islamic Republic of)

2013-10-15T23:59:59.000Z

480

Hydrogen passivation of Se and Te in AlSb M. D. McCluskey and E. E. Haller  

E-Print Network [OSTI]

Hydrogen passivation of Se and Te in AlSb M. D. McCluskey and E. E. Haller Lawrence Berkeley observed local vibrational modes LVM's arising from DX-hydrogen complex in AlSb. Hydrogen was diffused into bulk AlSb:Se and AlSb:Te by annealing in sealed quartz ampoules with either hydrogen gas or methanol CH

McCluskey, Matthew

Note: This page contains sample records for the topic "te grated analy" 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.


481

A New LCA Methodology of Technology Evolution (TE-LCA) and its Application to the Production of Ammonia (1950-2000) (8 pp)  

Science Journals Connector (OSTI)

This paper presents a new LCA method of technology evolution (TE-LCA), and its application to the production ... over the last fifty years. The TE-LCA of a chemical process is the procedure ... then transformed ...

Ramon Mendivil; Ulrich Fischer

2006-03-01T23:59:59.000Z

482

Open-circuit voltage, fill factor, and efficiency of a CdS/CdTe solar cell  

SciTech Connect (OSTI)

The dependences of the open-circuit voltage, fill factor, and efficiency of the thin-film CdS/CdTe solar cell on the resistivity {rho} and carrier lifetime {tau} in the absorbing CdTe layer were studied. In the common case in which the uncompensated acceptor concentration and the electron lifetime in the CdTe layer are within 10{sup 15}-10{sup 16} cm{sup -3} and 10{sup -10}-10{sup -9} s, the calculation results correspond to the achieved efficiency of the best thin-film CdS/CdTe solar cells. It was shown that, by decreasing {rho} and increasing {tau} in the absorbing CdTe layer, the open-circuit voltage, fill factor, and efficiency can be substantially increased, with their values approaching the theoretical limit for such devices.

Kosyachenko, L. A., E-mail: lakos@chv.ukrpack.net; Grushko, E. V. [Yuriy Fedkovych Chernivtsi National University (Ukraine)

2010-10-15T23:59:59.000Z

483

MATERIALS FOR SOLAR PHOTOCELLS : PLACE OF CdTe Laboratoire de Physique des Solides C. N. R. S., 1, place Aristide-Briand, 92190 Meudon, France  

E-Print Network [OSTI]

MATERIALS FOR SOLAR PHOTOCELLS : PLACE OF CdTe M. RODOT Laboratoire de Physique des Solides C. N. R général, puis appliqués à CdTe. On montre que CdTe est l'un des matériaux les plus prometteurs. Une revue des cellules au CdTe doivent encore être obtenues. Abstract. 2014 The choice of the best materials

Paris-Sud XI, Université de

484

HOMOGENEITY ALONG Cl-COMPENSATED THM GROWN CdTe INGOT NGO-TICH-PHUOC, G. M. MARTIN, C. BELIN and E. FABRE  

E-Print Network [OSTI]

195 HOMOGENEITY ALONG Cl-COMPENSATED THM GROWN CdTe INGOT NGO-TICH-PHUOC, G. M. MARTIN, C. BELIN resistivity CdTe is believed to present some potentialities as a material for y-rays detection at room carried out [8-9]. This paper presents an assessment of Cl-compen- sated, THM grown CdTe ingots : emphasis

Paris-Sud XI, Université de

485

THE RELATIONSHIP OF CdS/CdTe CELL BAND PROFILES TO J-V CHARACTERISTICS AND BIAS-DEPENDENT QUANTUM EFFICIENCY  

E-Print Network [OSTI]

-over, and, in some cases, long J-V and capacitance transient effects. CdTe is highly compensated containing by charge in the bulk CdTe within the absorber. PATHWAYS TO INCREASED EFFICIENCY There are several general to realize in practice. One pathway is by increasing the net negative charge in the CdTe by "p-type doping

Sites, James R.

486

Investigation of the evolution of single domain ,,111...B CdTe films by molecular beam epitaxy on miscut ,,001...Si substrate  

E-Print Network [OSTI]

Investigation of the evolution of single domain ,,111...B CdTe films by molecular beam epitaxy; accepted for publication 22 July 1998 A comprehensive view of the microstructure of 111 B CdTe films grown and scanning transmission electron microscopy. It is found that in the initial growth stage, CdTe nucleates

Pennycook, Steve

487

The irradiation hardness of CdTe solar cells was inves-tigated for extremely high fluence of protons (up to  

E-Print Network [OSTI]

ABSTRACT The irradiation hardness of CdTe solar cells was inves- tigated for extremely high fluence high fluences. One general degradation characteristic for CdTe cells was calculated using a damage dose formulation, allowing a comprehen- sive comparison with other cell technologies. CdTe cells show an excellent

Romeo, Alessandro

488

FLEXIBLE CdTe SOLAR CELLS BY A LOW TEMPERATURE PROCESS ON ITO/ZnO COATED A. Salavei, I. Rimmaudo, F. Piccinelli1  

E-Print Network [OSTI]

FLEXIBLE CdTe SOLAR CELLS BY A LOW TEMPERATURE PROCESS ON ITO/ZnO COATED POLYMERS A. Salavei, I of a deposition process for flexible CdTe devices on ITO/ZnO coated polymers. Optimization of fabrication process will be discussed. Keywords: Flexible Substrate, CdTe, ITO, Laser Processing, Thin Film Solar Cell 1 INTRODUCTION

Romeo, Alessandro

489

TeV J2032+4130: a not-so-dark Accelerator?  

E-Print Network [OSTI]

The HEGRA gamma-ray source TeV J2032+4130 is considered the prototypical 'dark accelerator', since it was the first TeV source detected with no firm counterparts at lower frequencies. The Whipple collaboration observed this source in 2003-5 and the emission hotspot appears displaced about 9 arcminutes to the northeast of the HEGRA position, though given the large positional uncertainties the HEGRA and Whipple positions are consistent. Here we report on Westerbork Synthesis Radio Telescope (WSRT), Very Large Array (VLA), Chandra and INTEGRAL data covering the locations of the Whipple and HEGRA hotspots. We confirm a dual-lobed radio source (also see Marti et al., 2007) coincident with the Whipple hotspot, as well as a weak, partially non-thermal shell-like object, with a location and morphology very similar to the HEGRA source, in our WSRT and mosaicked VLA datasets, respectively. Due to its extended nature, it is likely that the latter structure is a more plausible counterpart of the reported very high energy (VHE) gamma-ray emissions in this region. If so, TeV J2032+4130 may not be a 'dark accelerator' after all. Further observations with the new generation of imaging Cherenkov telescopes are needed to pin down the precise location and morphology of the TeV emission region and thus clear up the confusion over its possible lower frequency counterparts.

Yousaf M. Butt; Jorge A. Combi; Jeremy Drake; John P. Finley; Alexander Konopelko; Matthew Lister; Jerome Rodriguez; Debra Shepherd

2006-11-23T23:59:59.000Z

490

Accelerated Stress Testing and Diagnostic Analysis of Degradation in CdTe Solar Cells  

SciTech Connect (OSTI)

The primary goal of this study was to ascertain the presence and types of mechanisms affecting CdS/CdTe device stability in the temperature range of 60 to 120 ..deg..C. It should be noted that the results presented were specific to cells made using the specific growth conditions described.

Albin, D. S.

2008-11-01T23:59:59.000Z

491

First measurement of hadronic event shapes in pp collisions at ?s = 7 TeV  

E-Print Network [OSTI]

Hadronic event shapes have been measured in protonproton collisions at ?s =7 TeV, with a data sample collected with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 3.2 pb-1. Event-shape ...

CMS Collaboration

492

Results on CP Violation from Belle T.E. Browder representing the Belle Collaboration  

E-Print Network [OSTI]

Results on CP Violation from Belle T.E. Browder representing the Belle Collaboration Department of Physics, University of Hawaii, Honolulu, Hawaii Abstract. I describe the recent measurement of the CP In 1973, Kobayashi and Maskawa (KM) first proposed a model where CP violation is incorporated

Browder, Tom

493

14%-efficient flexible CdTe solar cells on ultra-thin glass substrates  

SciTech Connect (OSTI)

Flexible glass enables high-temperature, roll-to-roll processing of superstrate devices with higher photocurrents than flexible polymer foils because of its higher optical transmission. Using flexible glass in our high-temperature CdTe process, we achieved a certified record conversion efficiency of 14.05% for a flexible CdTe solar cell. Little has been reported on the flexibility of CdTe devices, so we investigated the effects of three different static bending conditions on device performance. We observed a consistent trend of increased short-circuit current and fill factor, whereas the open-circuit voltage consistently dropped. The quantum efficiency under the same static bend condition showed no change in the response. After storage in a flexed state for 24 h, there was very little change in device efficiency relative to its unflexed state. This indicates that flexible glass is a suitable replacement for rigid glass substrates, and that CdTe solar cells can tolerate bending without a decrease in device performance.

Rance, W. L.; Burst, J. M.; Reese, M. O.; Gessert, T. A.; Metzger, W. K.; Barnes, T. M. [National Renewable Energy Laboratory, Golden, Colorado 80401 (United States); Meysing, D. M.; Wolden, C. A. [Colorado School of Mines, Golden, Colorado 80401 (United States); Garner, S.; Cimo, P. [Corning Incorporated, Corning, New York 14831 (United States)

2014-04-07T23:59:59.000Z

494

MilagroA TeV Observatory for Gamma Ray Bursts  

E-Print Network [OSTI]

Milagro­A TeV Observatory for Gamma Ray Bursts B.L. Dingus and the Milagro Collaboration Los energy gamma-rays from gamma-ray bursts. The highest energy gamma rays supply very strong constraints on the nature of gamma-ray burst sources as well as fundamental physics. Because the highest energy gamma-rays

California at Santa Cruz, University of

495

Rational Synthesis of Ultrathin n-Type Bi2Te3 Nanowires with Enhanced Thermoelectric Properties  

E-Print Network [OSTI]

, which can generate electricity by recovering waste heat or be used as solid-state cooling devices, have-based thermoelectric power generation and solid-state cooling devices with superior performance in a reliableRational Synthesis of Ultrathin n-Type Bi2Te3 Nanowires with Enhanced Thermoelectric Properties

Xu, Xianfan

496

Expectations for neutron-antineutron oscillation time from TeV scale baryogenesis  

SciTech Connect (OSTI)

A TeV scale extension of the standard model that incorporates the seesaw mechanism for neutrino masses along with quark-lepton unification is presented. It is shown that this model leads to the {Delta}B= 2 baryon number violating process of neutron-antineutron (n-bar n) oscillation. The model has all the ingredients to generate the observed baryon asymmetry of the universe using the B-violating decay of a scalar field involved in the seesaw mechanism. The B-violating decay arises from the exchange of color sextet scalars which have TeV scale masses. Baryogenesis occurs below the sphaleron decoupling temperature and has been termed post-sphaleron baryogenesis. Here we show that the constraints of TeV scale baryogenesis, when combined with the neutrino oscillation data and restrictions from flavor changing neutral currents mediated by the colored scalars imply an upper limit on the n-bar n oscillation time of 5 Multiplication-Sign 10{sup 10} sec. regardless of the quark-lepton unification scale. If this scale is relatively low, in the (200 - 250) TeV range, {tau}{sub n-bar} {sub n} is predicted to be less than 10{sup 10} sec., which is accessible to the next generation of proposed experiments.

Babu, K. S. [Department of Physics, Oklahoma State University, Stillwater, OK 74078 (United States); Bhupal Dev, P. S. [Consortium for Fundamental Physics, School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL (United Kingdom); Fortes, Elaine C. F. S. [Instituto de Fisica Teorica-Universidade Estadual Paulista, R. Dr. Bento Teobaldo Ferraz 271, Sao Paulo-SP, 01140-070 (Brazil); Mohapatra, Rabindra N. [Maryland Center for Fundamental Physics and Department of Physics, University of Maryland, College Park, MD 20742 (United States)

2013-05-23T23:59:59.000Z

497

REVIEW OF OPTICAL APPLICATIONS OF CdTe Mobil Tyco Solar Energy Corporation 16 Hickory Drive  

E-Print Network [OSTI]

REVIEW OF OPTICAL APPLICATIONS OF CdTe R. O. BELL Mobil Tyco Solar Energy Corporation 16 Hickory of optical applications. These include electrooptic modulation, high power laser windows, electroluminescence will be paid to the various optical absorption mechanisms and the effects of impurities on the optical behavior

Paris-Sud XI, Université de

498

Investigation of deep level defects in CdTe thin films  

SciTech Connect (OSTI)

In the past few years, a large body of work has been dedicated to CdTe thin film semiconductors, as the electronic and optical properties of CdTe nanostructures make them desirable for photovoltaic applications. The performance of semiconductor devices is greatly influenced by the deep levels. Knowledge of parameters of deep levels present in as-grown materials and the identification of their origin is the key factor in the development of photovoltaic device performance. Photo Induced Current Transient Spectroscopy technique (PICTS) has proven to be a very powerful method for the study of deep levels enabling us to identify the type of traps, their activation energy and apparent capture cross section. In the present work, we report the effect of growth parameters and LASER irradiation intensity on the photo-electric and transport properties of CdTe thin films prepared by Close-Space Sublimation method using SiC electrical heating element. CdTe thin films were grown at three different source temperatures (630, 650 and 700 C). The grown films were irradiated with Nd:YAG LASER and characterized by Photo-Induced Current Transient Spectroscopy, Photocurrent measurementand Current Voltage measurements. The defect levels are found to be significantly influenced by the growth temperature.

Shankar, H.; Castaldini, A. [Department of Physics and Astronomy, University of Bologna, Viale Berti Pichat 6/2, I-40127 Bologna (Italy); Dieguez, E.; Rubio, S. [Crystal Growth Lab, Department of Materials Physics, Faculty of Science, University Autonoma of Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid (Spain); Dauksta, E.; Medvid, A. [Institute of Technical Physics, Riga Technical University, 14 Azenes Str, Riga, Latvia, Department of Materials (Latvia); Cavallini, A. [Department of Physics and Astronomy,University of Bologna, Viale Berti Pichat 6/2, I-40127 Bologna (Italy)

2014-02-21T23:59:59.000Z

499

Comparison of Minority Carrier Lifetime Measurements in Superstrate and Substrate CdTe PV Devices  

SciTech Connect (OSTI)

We discuss typical and alternative procedures to analyze time-resolved photoluminescence (TRPL) measurements of minority carrier lifetime (MCL) with the hope of enhancing our understanding of how this technique may be used to better analyze CdTe photovoltaic (PV) device functionality. Historically, TRPL measurements of the fast recombination rate (t{sub 1}) have provided insightful correlation with broad device functionality. However, we have more recently found that t{sub 1} does not correlate as well with smaller changes in device performance, nor does it correlate well with performance differences observed between superstrate and substrate CdTe PV devices. This study presents TRPL data for both superstrate and substrate CdTe devices where both t{sub 1} and the slower TRPL decay (t{sub 2}) are analyzed. The study shows that changes in performance expected from small changes in device processing may correlate better with t{sub 2}. Numerical modeling further suggests that, for devices that are expected to have similar drift field in the depletion region, effects of changes in bulk MCL and interface recombination should be more pronounced in t{sub 2}. Although this technique may provide future guidance to improving CdS/CdTe device performance, it is often difficult to extract statistically precise values for t{sub 2}, and therefore t{sub 2} data may demonstrate significant scatter when correlated with performance parameters.

Gessert, T. A.; Dhere, R. G.; Duenow, J. N.; Kuciauskas, D.; Kanevce, A.; Bergeson, J. D.

2011-01-01T23:59:59.000Z

500

Nanoassembly control and optical absorption in CdTe-ZnO nanocomposite thin films  

SciTech Connect (OSTI)

The spatial distribution of CdTe nanoparticles within a ZnO thin-film matrix was manipulated using a dual-source, sequential radio-frequency (RF)-sputter deposition technique to produce nanocomposite materials with tuned spectral absorption characteristics. The relative substrate exposure time to each sputtering source was used to control the semiconductor phase connectivity, both within the film plane and along the film growth direction, to influence the degree of photocarrier confinement and the resulting optical transition energies exhibited by the CdTe phase. Significant changes (up to {Delta}E {approx_equal} 0.3 eV) in the absorption onset energy for the CdTe nanoparticle ensemble were produced through modification in the extended structure of the semiconductor phase. Raman spectroscopy, cross-sectional transmission electron microscopy, and x-ray diffraction were used to confirm the phase identity of the CdTe and ZnO and to characterize the nanostructures produced in these composite films. Isochronal annealing for 5 min at temperatures up to 800 deg. C further indicated the potential to improve film crystallinity as well as to establish the post-deposition thermal processing limits of stability for the semiconductor phase. The study highlights the significance of ensemble behavior as a means to influence quantum-scale semiconductor optical characteristics of import to the use of such materials as the basis for a variety of optoelectronic devices, including photosensitized heterojunction components in thin film photovoltaics.

Potter, B. G. Jr. [Materials Science and Engineering Department, University of Arizona, Tucson, Arizona 85721 (United States); College of Optical Sciences, University of Arizona, Tucson, Arizona 85721 (United States); Beal, R. J.; Allen, C. G. [Materials Science and Engineering Department, University of Arizona, Tucson, Arizona 85721 (United States)

2012-02-01T23:59:59.000Z