Sample records for multijunction solar cells

  1. Multi-junction solar cell device

    DOE Patents [OSTI]

    Friedman, Daniel J. (Lakewood, CO); Geisz, John F. (Wheat Ridge, CO)

    2007-12-18T23:59:59.000Z

    A multi-junction solar cell device (10) is provided. The multi-junction solar cell device (10) comprises either two or three active solar cells connected in series in a monolithic structure. The multi-junction device (10) comprises a bottom active cell (20) having a single-crystal silicon substrate base and an emitter layer (23). The multi-junction device (10) further comprises one or two subsequent active cells each having a base layer (32) and an emitter layer (23) with interconnecting tunnel junctions between each active cell. At least one layer that forms each of the top and middle active cells is composed of a single-crystal III-V semiconductor alloy that is substantially lattice-matched to the silicon substrate (22). The polarity of the active p-n junction cells is either p-on-n or n-on-p. The present invention further includes a method for substantially lattice matching single-crystal III-V semiconductor layers with the silicon substrate (22) by including boron and/or nitrogen in the chemical structure of these layers.

  2. Formation of Porous Layers by Electrochemical Etching of Germanium and Gallium Arsenide for Cleave Engineered Layer Transfer (CELT) Application in High Efficiency Multi-Junction Solar Cells

    E-Print Network [OSTI]

    Fong, David Michael

    2012-01-01T23:59:59.000Z

    III! V Multijunction Solar Cells,” (2003). J. F. Geisz, etEfficiency Multi-Junction Solar Cells A thesis submitted inEfficiency Multi-Junction Solar Cells By David Michael Fong

  3. Multijunction solar cell efficiencies: effect of spectral window, optical environment and radiative

    E-Print Network [OSTI]

    Atwater, Harry

    Multijunction solar cell efficiencies: effect of spectral window, optical environment and radiative,9 The optical environment of a solar cell controls where the radiated photons from a subcell are directed*a Solar cell efficiency is maximized through multijunction architectures that minimize carrier

  4. Aberration-corrected transmission electron microscopy analyses of GaAs/Si interfaces in wafer-bonded multi-junction solar cells

    E-Print Network [OSTI]

    Dunin-Borkowski, Rafal E.

    -bonded multi-junction solar cells Dietrich Häussler a , Lothar Houben b , Stephanie Essig c , Mert Kurttepeli online 20 July 2013 Keywords: Multi-junction solar cell Wafer bonding Interfaces Aberration corrected and composition fluctuations near interfaces in wafer-bonded multi-junction solar cells. Multi-junction solar

  5. NREL Spurred the Success of Multijunction Solar Cells (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2013-08-01T23:59:59.000Z

    Many scientists once believed that high-quality gallium indium phosphide (GaInP) alloys could not be grown for use as semiconductors because the alloys would separate. However, researchers at the National Renewable Energy Laboratory (NREL) thought differently, and they employed GaInP in a material combination that allowed the multijunction cell to flourish. The multijunction cell is now the workhorse that powers satellites and the catalyst for renewed interest in concentrator photovoltaic products.

  6. DESIGN APPROACHES AND MATERIALS PROCESSES FOR ULTRAHIGH EFFICIENCY LATTICE MISMATCHED MULTI-JUNCTION SOLAR CELLS

    E-Print Network [OSTI]

    Atwater, Harry

    -JUNCTION SOLAR CELLS Melissa J. Griggs 1 , Daniel C. Law 2 , Richard R. King 2 , Arthur C. Ackerman 3 , James M heterostructures grown in a multi-junction solar cell-like structure by MOCVD. Initial solar cell data are also of the minority carrier lifetime. INTRODUCTION High efficiency triple junction solar cells have recently been

  7. A market analysis for high efficiency multi-junction solar cells grown on SiGe

    E-Print Network [OSTI]

    Judkins, Zachara Steele

    2007-01-01T23:59:59.000Z

    Applications, markets and a cost model are presented for III-V multi-junction solar cells built on compositionally graded SiGe buffer layers currently being developed by professors Steven Ringell of Ohio State University ...

  8. innovati nNREL Scientists Spurred the Success of Multijunction Solar Cells

    E-Print Network [OSTI]

    innovati nNREL Scientists Spurred the Success of Multijunction Solar Cells Before 1984, many a solar cell can convert into electricity. Olson thought the focus should change to finding materials-winning gallium indium phosphide/gallium arsenide tandem solar cell, which had achieved record efficiencies, con

  9. Design of Semiconductor-Based Back Reflectors for High Voc Monolithic Multijunction Solar Cells: Preprint

    SciTech Connect (OSTI)

    Garcia, I.; Geisz, J.; Steiner, M.; Olson, J.; Friedman, D.; Kurtz, S.

    2012-06-01T23:59:59.000Z

    State-of-the-art multijunction cell designs have the potential for significant improvement before going to higher number of junctions. For example, the Voc can be substantially increased if the photon recycling taking place in the junctions is enhanced. This has already been demonstrated (by Alta Devices) for a GaAs single-junction cell. For this, the loss of re-emitted photons by absorption in the underlying layers or substrate must be minimized. Selective back surface reflectors are needed for this purpose. In this work, different architectures of semiconductor distributed Bragg reflectors (DBR) are assessed as the appropriate choice for application in monolithic multijunction solar cells. Since the photon re-emission in the photon recycling process is spatially isotropic, the effect of the incident angle on the reflectance spectrum is of central importance. In addition, the DBR structure must be designed taking into account its integration into the monolithic multijunction solar cells, concerning series resistance, growth economics, and other issues. We analyze the tradeoffs in DBR design complexity with all these requirements to determine if such a reflector is suitable to improve multijunction solar cells.

  10. Boosting Accuracy of Testing Multijunction Solar Cells (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2015-01-01T23:59:59.000Z

    This NREL Highlight describes research into a more precise technology for measuring efficiency of concentrating solar cells, which will enable the industry to advance.

  11. NREL Scientists Spurred the Success of Multijunction Solar Cells (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2012-09-01T23:59:59.000Z

    Before 1984, many scientists believed that high-quality gallium indium phosphide (GaInP) alloys could not be grown for use as semiconductors because the alloys would separate. One researcher at the Solar Energy Research Institute (SERI) thought differently. His name was Jerry Olson, and his innovative thinking changed solar history. Olson identified a material combination that allowed the multijunction cell to flourish. It is now the workhorse that powers satellites and the catalyst for renewed interest in concentrator photovoltaic (CPV) products.

  12. Wide-band-gap InAlAs solar cell for an alternative multijunction approach Marina S. Leite,1,a

    E-Print Network [OSTI]

    Atwater, Harry

    Wide-band-gap InAlAs solar cell for an alternative multijunction approach Marina S. Leite,1,a Robyn; published online 28 February 2011 We have fabricated an In0.52Al0.48As solar cell lattice-matched to In-free InxAl1-xAs alloyed layers were used to fabricate the single junction solar cell. Photoluminescence

  13. Current-matched high-efficiency, multijunction monolithic solar cells

    DOE Patents [OSTI]

    Olson, Jerry M. (Lakewood, CO); Kurtz, Sarah R. (Golden, CO)

    1993-01-01T23:59:59.000Z

    The efficiency of a two-junction (cascade) tandem photovoltaic device is improved by adjusting (decreasing) the top cell thickness to achieve current matching. An example of the invention was fabricated out of Ga.sub.0.52 In.sub.0.48 P and GaAs. Additional lattice-matched systems to which the invention pertains include Al.sub.x Ga.sub.1-x /GaAS (x= 0.3-0.4), GaAs/Ge and Ga.sub.y In.sub.l-y P/Ga.sub.y+0.5 In.sub.0.5-y As (0

  14. Temperature-Dependent Measurements of an Inverted Metamorphic Multijunction (IMM) Solar Cell: Preprint

    SciTech Connect (OSTI)

    Steiner, M. A.; Geisz, J. F.; Friedman, D. J.; Olavarria, W. J.; Duda, A.; Moriarty, T. E.

    2011-07-01T23:59:59.000Z

    The inverted metamorphic multijunction (IMM) solar cell has demonstrated efficiencies as high as 40.8% at 25 degrees C and 326 suns concentration. The actual operating temperature in a commercial module, however, is likely to be as much as 50-70 degrees C hotter, reaching as high as 100 degrees C. In order to be able to evaluate the cell performance under these real-world operating conditions, we have measured the open-circuit voltage, short-circuit current density and efficiency at temperatures up to 125 degrees C and concentrations up to 1000 suns, as well as the temperature coefficients of these parameters. Spectral response and one-sun current-voltage characteristics were measured by carefully adjusting the incident spectrum to selectively current-limit the different subcells. Concentrator measurements were taken on a pulsed solar simulator to minimize any additional heating due to the high intensity illumination. We compare our measured values to predictions based on detailed models of various triple junction solar cells. By choosing the optimum bandgaps for high temperature operation, the IMM can potentially result in greater energy production and lower temperature sensitivity under real operating conditions than a Ge-based solar cell.

  15. Advances on multijunction solar cell characterization aimed at the optimization of real concentrator performance

    SciTech Connect (OSTI)

    Garcia-Linares, Pablo, E-mail: pablo.garcia-linares@cea.fr; Dominguez, César, E-mail: pablo.garcia-linares@cea.fr; Voarino, Philippe, E-mail: pablo.garcia-linares@cea.fr; Besson, Pierre, E-mail: pablo.garcia-linares@cea.fr; Baudrit, Mathieu, E-mail: pablo.garcia-linares@cea.fr [CEA-LITEN, LCPV, INES, Le Bourget du Lac (France)

    2014-09-26T23:59:59.000Z

    Multijunction solar cells (MJSC) are usually developed to maximize efficiency under test conditions and not under real operation. This is the case of anti-reflective coatings (ARC), which are meant to minimize Fresnel reflection losses for a family of incident rays at room temperature. In order to understand and quantify the discrepancies between test and operation conditions, we have experimentally analyzed the spectral response of MJSC for a variety of incidence angles that are in practice received by a concentrator cell in high-concentration photovoltaic (HCPV) receiver designs. Moreover, we characterize this angular dependence as a function of temperature in order to reproduce real operation conditions. As the refractive index of the silicone is dependent on temperature, an optical mismatch is expected. Regarding other characterization techniques, a method called Relative EL Homogeneity Analysis (RELHA) is applied to processed wafers prior to dicing, allowing to diagnose the wafer crystalline homogeneity for each junction. Finally, current (I)-voltage (V) characterization under strongly unbalanced light spectra has also been carried out for a number of low-level irradiances, providing insight on each junction shunt resistance and corresponding radiative coupling.

  16. InGaAsN/GaAs heterojunction for multi-junction solar cells

    DOE Patents [OSTI]

    Kurtz, Steven R. (Albuquerque, NM); Allerman, Andrew A. (Albuquerque, NM); Klem, John F. (Albuquerque, NM); Jones, Eric D. (Edgewood, NM)

    2001-01-01T23:59:59.000Z

    An InGaAsN/GaAs semiconductor p-n heterojunction is disclosed for use in forming a 0.95-1.2 eV bandgap photodetector with application for use in high-efficiency multi-junction solar cells. The InGaAsN/GaAs p-n heterojunction is formed by epitaxially growing on a gallium arsenide (GaAs) or germanium (Ge) substrate an n-type indium gallium arsenide nitride (InGaAsN) layer having a semiconductor alloy composition In.sub.x Ga.sub.1-x As.sub.1-y N.sub.y with 070%.

  17. High-performance broadband optical coatings on InGaN/GaN solar cells for multijunction device integration

    SciTech Connect (OSTI)

    Young, N. G., E-mail: ngyoung@engineering.ucsb.edu; Farrell, R. M.; Iza, M.; Speck, J. S. [Materials Department, University of California, Santa Barbara, California 93106 (United States); Perl, E. E.; Keller, S. [Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106 (United States); Bowers, J. E.; Nakamura, S.; DenBaars, S. P. [Materials Department, University of California, Santa Barbara, California 93106 (United States); Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106 (United States)

    2014-04-21T23:59:59.000Z

    We demonstrate InGaN/GaN multiple quantum well solar cells grown by metalorganic chemical vapor deposition on a bulk (0001) substrate with high-performance broadband optical coatings to improve light absorption. A front-side anti-reflective coating and a back-side dichroic mirror were designed to minimize front surface reflections across a broad spectral range and maximize rear surface reflections only in the spectral range absorbed by the InGaN, making the cells suitable for multijunction solar cell integration. Application of optical coatings increased the peak external quantum efficiency by 56% (relative) and conversion efficiency by 37.5% (relative) under 1 sun AM0 equivalent illumination.

  18. Multi-junction, monolithic solar cell using low-band-gap materials lattice matched to GaAs or Ge

    DOE Patents [OSTI]

    Olson, Jerry M. (Lakewood, CO); Kurtz, Sarah R. (Golden, CO); Friedman, Daniel J. (Lakewood, CO)

    2001-01-01T23:59:59.000Z

    A multi-junction, monolithic, photovoltaic solar cell device is provided for converting solar radiation to photocurrent and photovoltage with improved efficiency. The solar cell device comprises a plurality of semiconductor cells, i.e., active p/n junctions, connected in tandem and deposited on a substrate fabricated from GaAs or Ge. To increase efficiency, each semiconductor cell is fabricated from a crystalline material with a lattice constant substantially equivalent to the lattice constant of the substrate material. Additionally, the semiconductor cells are selected with appropriate band gaps to efficiently create photovoltage from a larger portion of the solar spectrum. In this regard, one semiconductor cell in each embodiment of the solar cell device has a band gap between that of Ge and GaAs. To achieve desired band gaps and lattice constants, the semiconductor cells may be fabricated from a number of materials including Ge, GaInP, GaAs, GaInAsP, GaInAsN, GaAsGe, BGaInAs, (GaAs)Ge, CuInSSe, CuAsSSe, and GaInAsNP. To further increase efficiency, the thickness of each semiconductor cell is controlled to match the photocurrent generated in each cell. To facilitate photocurrent flow, a plurality of tunnel junctions of low-resistivity material are included between each adjacent semiconductor cell. The conductivity or direction of photocurrent in the solar cell device may be selected by controlling the specific p-type or n-type characteristics for each active junction.

  19. Ultrahigh Efficiency Multiband Solar Cells Final Report for Director's Innovation Initiative Project DII-2005-1221

    E-Print Network [OSTI]

    Ager III, Joel W.; Walukiewicz, W.; Yu, Kin Man

    2006-01-01T23:59:59.000Z

    of Multijunction Solar Cell Performance in RadiationIgari, and W. Warta, “Solar Cell Efficiency Tables (Versionof Multijunction Solar Cell Performance in Radiation

  20. III-V Growth on Silicon Toward a Multijunction Cell

    SciTech Connect (OSTI)

    Geisz, J.; Olson, J.; McMahon, W.; Friedman, D.; Kibbler, A.; Kramer, C.; Young, M.; Duda, A.; Ward, S.; Ptak, A.; Kurtz, S.; Wanlass, M.; Ahrenkiel, P.; Jiang, C. S.; Moutinho, H.; Norman, A.; Jones, K.; Romero, M.; Reedy, B.

    2005-11-01T23:59:59.000Z

    A III-V on Si multijunction solar cell promises high efficiency at relatively low cost. The challenges to epitaxial growth of high-quality III-Vs on Si, though, are extensive. Lattice-matched (LM) dilute-nitride GaNPAs solar cells have been grown on Si, but their performance is limited by defects related to the nitrogen. Advances in the growth of lattice-mismatched (LMM) materials make more traditional III-Vs, such as GaInP and GaAsP, very attractive for use in multijunction solar cells on silicon.

  1. A 2-terminal perovskite/silicon multijunction solar cell enabled by a silicon tunnel junction

    E-Print Network [OSTI]

    Mailoa, Jonathan P.

    With the advent of efficient high-bandgap metal-halide perovskite photovoltaics, an opportunity exists to make perovskite/silicon tandem solar cells. We fabricate a monolithic tandem by developing a silicon-based interband ...

  2. Light-Biasing Electron-Beam-Induced-Current Measurements for Multijunction Solar Cells: Preprint

    SciTech Connect (OSTI)

    Romero, M. J.; Olson, J. M.; Al-Jassim, M. M.

    2001-10-01T23:59:59.000Z

    Presented at the 2001 NCPV Program Review Meeting: Results using light-biasing EBIC are illustrated for dual-junction InGaP/InGaAs solar cells.

  3. Broadband and omnidirectional anti-reflection layer for III/V multi-junction solar cells

    E-Print Network [OSTI]

    Diedenhofen, Silke L; Haverkamp, Erik; Bauhuis, Gerard; Schermer, John; Rivas, Jaime Gómez; 10.1016/j.solmat.2012.02.022

    2012-01-01T23:59:59.000Z

    We report a novel graded refractive index antireflection coating for III/V quadruple solar cells based on bottom-up grown tapered GaP nanowires. We have calculated the photocurrent density of an InGaP-GaAs-InGaAsP-InGaAs solar cell with a MgF2/ZnS double layer antireflection coating and with a graded refractive index coating. The photocurrent density can be increased by 5.9 % when the solar cell is coated with a graded refractive index layer with a thickness of 1\\mu m. We propose to realize such a graded refractive index layer by growing tapered GaP nanowires on III/V solar cells. For a first demonstration of the feasibility of the growth of tapered nanowires on III/V solar cells, we have grown tapered GaP nanowires on AlInP/GaAs substrates. We show experimentally that the reflection from the nanowire coated substrate is reduced and that the transmission into the substrate is increased for a broad spectral and angular range.

  4. Optimized III-V Multijunction Concentrator Solar Cells on Patterned Si and Ge Substrates: Final Technical Report, 15 September 2004--30 September 2006

    SciTech Connect (OSTI)

    Ringel, S. A.

    2008-11-01T23:59:59.000Z

    Goal is to demo realistic path to III-V multijunction concentrator efficiencies > 40% by substrate-engineering combining compositional grading with patterned epitaxy for small-area cells for high concentration.

  5. Calcium niobate nanosheets as a novel electron transport material for solution-processed multi-junction polymer solar cells

    E-Print Network [OSTI]

    Osterloh, Frank

    from a common solvent. Nanoscale interpenetrating networks are formed as the donor and acceptor phase-junction polymer solar cells Lilian Chang,a Michael A. Holmes,b Mollie Waller,b Frank E. Osterlohb and Adam J-processed tandem polymer solar cells are demonstrated using stacked perovskite, (TBA,H) Ca2Nb3O10 (CNO

  6. Performance of CPV System Using Three Types of III-V Multi-Junction Solar Cells: Preprint

    SciTech Connect (OSTI)

    Hashimoto, J.; Kurtz, S.; Sakurai, K.; Muller, M.; Otani, K.

    2012-04-01T23:59:59.000Z

    The performance of sister CPV systems is compared in Japan and the U.S. The conclusion is that the alignment of the systems can affect the design of the solar cells.

  7. Quantum well multijunction photovoltaic cell

    DOE Patents [OSTI]

    Chaffin, R.J.; Osbourn, G.C.

    1983-07-08T23:59:59.000Z

    A monolithic, quantum well, multilayer photovoltaic cell comprises a p-n junction comprising a p-region on one side and an n-region on the other side, each of which regions comprises a series of at least three semiconductor layers, all p-type in the p-region and all n-type in the n-region; each of said series of layers comprising alternating barrier and quantum well layers, each barrier layer comprising a semiconductor material having a first bandgap and each quantum well layer comprising a semiconductor material having a second bandgap when in bulk thickness which is narrower than said first bandgap, the barrier layers sandwiching each quantum well layer and each quantum well layer being sufficiently thin that the width of its bandgap is between said first and second bandgaps, such that radiation incident on said cell and above an energy determined by the bandgap of the quantum well layers will be absorbed and will produce an electrical potential across said junction.

  8. Boosting Accuracy of Testing Multijunction Solar Cells (Fact Sheet), NREL Highlights in Research & Development, NREL (National Renewable Energy Laboratory)

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWPSuccess Stories Site MapSolarAbout Neutrinos Generalhas developed a

  9. Formation of Porous Layers by Electrochemical Etching of Germanium and Gallium Arsenide for Cleave Engineered Layer Transfer (CELT) Application in High Efficiency Multi-Junction Solar Cells

    E-Print Network [OSTI]

    Fong, David Michael

    2012-01-01T23:59:59.000Z

    film photovoltaics [1]. This roughly doubling of efficiencyMJ photovoltaics. MJ solar cells achieve higher efficiencies

  10. High efficiency, radiation-hard solar cells

    E-Print Network [OSTI]

    Ager III, J.W.; Walukiewicz, W.

    2004-01-01T23:59:59.000Z

    J. F. Geisz, “Superior radiation resistance of In 1-x Ga x Nand H. Itoh, “Proton radiation analysis of multi-junction56326 High efficiency, radiation-hard solar cells Final

  11. Commercialization of New Lattice-Matched Multi-Junction Solar Cells Based on Dilute Nitrides: July 8, 2010 - March 7, 2012

    SciTech Connect (OSTI)

    Herb, J.

    2012-04-01T23:59:59.000Z

    Final Technical Progress Report for PV Incubator subcontract NAT-0-99013-03. The overall objective of this Incubator subcontract was to complete the work necessary to make commercial ready solar cells using the dilute nitride technology. The specific objectives of this program were aimed at completing the development of a triple-junction solar cell that incorporates a GaInNAs {approx}1eV subcell to the point of commercial readiness, and determining the cell reliability and, if necessary, identifying and eliminating process or material related issues that lead to early-life cell failures. There were three major objectives for Phase 1, each of which focuses on a key element of the solar cell that determines its performance in a commercial CPV system. One objective was to optimize the quality and performance of the key individual components making up the solar cell structure and then to optimize the integration of these components into a complete triple-junction cell. A second objective was to design and test anti-reflective coating that maximizes the light coupled into a 3J cell with a {approx}1 eV bottom cell bandgap. The third objective was to develop Highly Accelerated Life Tests (HALT) protocols and tools for identifying and correcting potential reliability problems. The Phase 2 objectives were a continuation of the work begun in Phase 1 but aimed at optimizing cell performance for commercial requirements. Phase 2 had four primary objectives: (1) develop a glass-matched anti-reflective coating (ARC) and optimize the cell/ARC to give good performance at 60C operating temperature, (2) optimize the cell for good operation at 60C and high concentration, and (3) complete the light biased HALT system and use it to determine what, if any, failures are observed, and (4) determine the reliability limits of the optimized cell.

  12. Scientists Confirm Robustness of Key Component in Ultra-High-Efficiency Solar Cell (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2011-05-01T23:59:59.000Z

    Scientists developed and tested a new, stable 1-eV metamorphic junction for a high efficiency multijunction III-V solar cell for CPV application.

  13. GaAs, AlGaAs and InGaP Tunnel Junctions for Multi-Junction Solar Cells Under Concentration: Resistance Study

    SciTech Connect (OSTI)

    Wheeldon, Jeffrey F.; Valdivia, Christopher E.; Walker, Alex; Kolhatkar, Gitanja; Hall, Trevor J.; Hinzer, Karin [Centre for Research in Photonics, University of Ottawa, Ottawa, ON (Canada); Masson, Denis; Riel, Bruno; Fafard, Simon [Cyrium Technologies Inc., Ottawa, ON (Canada); Jaouad, Abdelatif; Turala, Artur; Ares, Richard; Aimez, Vincent [Centre de Recherche en Nanofabrication et en Nanocaracterisation CRN2, Universite de Sherbrooke, Sherbrooke, QC (Canada)

    2010-10-14T23:59:59.000Z

    The following four TJ designs, AlGaAs/AlGaAs, GaAs/GaAs, AlGaAs/InGaP and AlGaAs/GaAs are studied to determine minimum doping concentration to achieve a resistance of <10{sup -4} {omega}{center_dot}cm{sup 2} and a peak tunneling current suitable for MJ solar cells up to 1500-suns concentration (operating current of 21 A/cm{sup 2}). Experimentally calibrated numerical models are used to determine how the resistance changes as a function of doping concentration. The AlGaAs/GaAs TJ design is determined to require the least doping concentration to achieve the specified resistance and peak tunneling current, followed by the GaAs/GaAs, and AlGaAs/AlGaAs TJ designs. The AlGaAs/InGaP TJ design can only achieve resistances >5x10{sup -4} {omega}cm{sup 2}.

  14. Bandgap Engineering in High-Efficiency Multijunction Concentrator Cells

    SciTech Connect (OSTI)

    King, R. R.; Sherif, R. A.; Kinsey, G. S.; Kurtz, S.; Fetzer, C. M.; Edmondson, K. M.; Law, D. C.; Cotal, H. L.; Krut, D. D.; Ermer, J. H.; Karam, N. H.

    2005-08-01T23:59:59.000Z

    This paper discusses semiconductor device research paths under investigation with the aim of reaching the milestone efficiency of 40%. A cost analysis shows that achieving very high cell efficiencies is crucial for the realization of cost-effective photovoltaics, because of the strongly leveraging effect of efficiency on module packaging and balance-of systems costs. Lattice-matched (LM) GaInP/ GaInAs/ Ge 3-junction cells have achieved the highest independently confirmed efficiency at 175 suns, 25?C, of 37.3% under the standard AM1.5D, low-AOD terrestrial spectrum. Lattice-mismatched, or metamorphic (MM), materials offer still higher potential efficiencies, if the crystal quality can be maintained. Theoretical efficiencies well over 50% are possible for a MM GaInP/ 1.17-eV GaInAs/ Ge 3-junction cell limited by radiative recombination at 500 suns. The bandgap - open circuit voltage offset, (Eg/q) - Voc, is used as a valuable theoretical and experimental tool to characterize multijunction cells with subcell bandgaps ranging from 0.7 to 2.1 eV. Experimental results are presented for prototype 6-junction cells employing an active {approx}1.1-eV dilute nitride GaInNAs subcell, with active-area efficiency greater than 23% and over 5.3 V open-circuit voltage under the 1-sun AM0 space spectrum. Such cell designs have theoretical efficiencies under the terrestrial spectrum at 500 suns concentration exceeding 55% efficiency, even for lattice-matched designs.

  15. EE Times: Semi News Groups claim breakthroughs in solar cells

    E-Print Network [OSTI]

    Rogers, John A.

    -based, multi-junction solar cells. Module cost is minimized by using high concentration ratio. XEE Times: Semi News Groups claim breakthroughs in solar cells Mark LaPedus Page 1 of 2 EE Times (05 separately claimed breakthroughs in solar cell production. Gallium arsenide (GaAs) and related compounds

  16. Broad spectrum solar cell

    DOE Patents [OSTI]

    Walukiewicz, Wladyslaw (Kensington, CA); Yu, Kin Man (Lafayette, CA); Wu, Junqiao (Richmond, CA); Schaff, William J. (Ithaca, NY)

    2007-05-15T23:59:59.000Z

    An alloy having a large band gap range is used in a multijunction solar cell to enhance utilization of the solar energy spectrum. In one embodiment, the alloy is In.sub.1-xGa.sub.xN having an energy bandgap range of approximately 0.7 eV to 3.4 eV, providing a good match to the solar energy spectrum. Multiple junctions having different bandgaps are stacked to form a solar cell. Each junction may have different bandgaps (realized by varying the alloy composition), and therefore be responsive to different parts of the spectrum. The junctions are stacked in such a manner that some bands of light pass through upper junctions to lower junctions that are responsive to such bands.

  17. Current and lattice matched tandem solar cell

    DOE Patents [OSTI]

    Olson, Jerry M. (Lakewood, CO)

    1987-01-01T23:59:59.000Z

    A multijunction (cascade) tandem photovoltaic solar cell device is fabricated of a Ga.sub.x In.sub.1-x P (0.505.ltoreq.X.ltoreq.0.515) top cell semiconductor lattice matched to a GaAs bottom cell semiconductor at a low-resistance heterojunction, preferably a p+/n+ heterojunction between the cells. The top and bottom cells are both lattice matched and current matched for high efficiency solar radiation conversion to electrical energy.

  18. Enhanced Photon Recycling in Multijunction Solar Cells

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisitingContractElectron-StateEnergyHeavyDepartmentebba Sign In About |

  19. Producing Solar Cells By Surface Preparation For Accelerated Nucleation Of Microcrystalline Silicon On Heterogeneous Substrates.

    DOE Patents [OSTI]

    Yang, Liyou (Plainsboro, NJ); Chen, Liangfan (Langhorne, PA)

    1998-03-24T23:59:59.000Z

    Attractive multi-junction solar cells and single junction solar cells with excellent conversion efficiency can be produced with a microcrystalline tunnel junction, microcrystalline recombination junction or one or more microcrystalline doped layers by special plasma deposition processes which includes plasma etching with only hydrogen or other specified etchants to enhance microcrystalline growth followed by microcrystalline. nucleation with a doped hydrogen-diluted feedstock.

  20. Multijunction Photovoltaic Technologies for High-Performance Concentrators: Preprint

    SciTech Connect (OSTI)

    McConnell, R.; Symko-Davies, M.

    2006-05-01T23:59:59.000Z

    Multijunction solar cells provide high-performance technology pathways leading to potentially low-cost electricity generated from concentrated sunlight. The National Center for Photovoltaics at the National Renewable Energy Laboratory has funded different III-V multijunction solar cell technologies and various solar concentration approaches. Within this group of projects, III-V solar cell efficiencies of 41% are close at hand and will likely be reported in these conference proceedings. Companies with well-developed solar concentrator structures foresee installed system costs of $3/watt--half of today's costs--within the next 2 to 5 years as these high-efficiency photovoltaic technologies are incorporated into their concentrator photovoltaic systems. These technology improvements are timely as new large-scale multi-megawatt markets, appropriate for high performance PV concentrators, open around the world.

  1. Ultra-High-Efficiency Multijunction Cell and Receiver Module, Phase 1B: High Performance PV Exploring and Accelerating Ultimate Pathways; Final Subcontract Report, 13 May 2005 - 10 December 2008

    SciTech Connect (OSTI)

    King, R. R.

    2010-03-01T23:59:59.000Z

    Spectrolab's two High Performance Photovoltaics primary objectives: (1) develop ultra-high-efficiency concentrator multijunction cells and (2) develop a robust concentrator cell receiver package.

  2. Upside-Down Solar Cell Achieves Record Efficiencies (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2010-12-01T23:59:59.000Z

    The inverted metamorphic multijunction (IMM) solar cell is an exercise in efficient innovation - literally, as the technology boasted the highest demonstrated efficiency for converting sunlight into electrical energy at its debut in 2005. Scientists at the National Renewable Energy Laboratory (NREL) inverted the conventional photovoltaic (PV) structure to revolutionary effect, achieving solar conversion efficiencies of 33.8% and 40.8% under one-sun and concentrated conditions, respectively.

  3. Nanocrystal Solar Cells

    E-Print Network [OSTI]

    Gur, Ilan

    2006-01-01T23:59:59.000Z

    Nov, 2005). Chapter 4 Hybrid solar cells with 3-dimensionalinorganic nanocrystal solar cells 5.1 Introduction In recentoperation of organic based solar cells and distinguish them

  4. The IMM solar cell's advanced ultra-light, highly flexible design earned it a 2008 R&D 100 Award and a 2009 Award for Excellence in Technology Transfer by the Federal Laboratory

    E-Print Network [OSTI]

    innovati n The IMM solar cell's advanced ultra-light, highly flexible design earned it a 2008 R. The cell's inventors pioneered a new class of solar cells with marked advantages in performance--particularly for complex multijunction cells. These cells convert solar energy more efficiently than single- junction cells

  5. Current- and lattice-matched tandem solar cell

    DOE Patents [OSTI]

    Olson, J.M.

    1985-10-21T23:59:59.000Z

    A multijunction (cascade) tandem photovoltaic solar cell device is fabricated of a Ga/sub x/In/sub 1-x/P (0.505 equal to or less than x equal to or less than 0.515) top cell semiconductor lattice-matched to a GaAs bottom cell semiconductor at a low resistance heterojunction, preferably a p/sup +//n/sup +/ heterojunction between the cells. The top and bottom cells are both lattice-matched and current-matched for high efficiency solar radiation conversion to electrical energy.

  6. Optimal Materials and Deposition Technique Lead to Cost-Effective Solar Cell with Best-Ever Conversion Efficiency (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2012-07-01T23:59:59.000Z

    This fact sheet describes how the SJ3 solar cell was invented, explains how the technology works, and why it won an R&D 100 Award. Based on NREL and Solar Junction technology, the commercial SJ3 concentrator solar cell - with 43.5% conversion efficiency at 418 suns - uses a lattice-matched multijunction architecture that has near-term potential for cells with {approx}50% efficiency. Multijunction solar cells have higher conversion efficiencies than any other type of solar cell. But developers of utility-scale and space applications crave even better efficiencies at lower costs to be both cost-effective and able to meet the demand for power. The SJ3 multijunction cell, developed by Solar Junction with assistance from foundational technological advances by the National Renewable Energy Laboratory, has the highest efficiency to date - almost 2% absolute more than the current industry standard multijunction cell-yet at a comparable cost. So what did it take to create this cell having 43.5% efficiency at 418-sun concentration? A combination of materials with carefully designed properties, a manufacturing technique allowing precise control, and an optimized device design.

  7. Current flow and efficiencies of concentrator InGaP/GaAs/Ge solar cells at temperatures below 300K

    SciTech Connect (OSTI)

    Kalinovsky, Vitaly S., E-mail: vitak.sopt@mail.ioffe.ru; Kontrosh, Evgeny V., E-mail: vitak.sopt@mail.ioffe.ru; Dmitriev, Pavel A., E-mail: vitak.sopt@mail.ioffe.ru; Pokrovsky, Pavel V., E-mail: vitak.sopt@mail.ioffe.ru; Chekalin, Alexander V., E-mail: vitak.sopt@mail.ioffe.ru; Andreev, Viacheslav M., E-mail: vitak.sopt@mail.ioffe.ru [Ioffe Physical-Technical Institute, St. Petersburg, Politekhicheskaya st. 26 (Russian Federation)

    2014-09-26T23:59:59.000Z

    The forward dark current density – voltage (J-V) characteristic is one of the most important characteristics of multi-junction solar cells. It indicates that the mechanisms of current flow in the space charge region of photoactive p-n junctions. If one is to idealize the optical and electrical (coupling) elements of the solar cells, it is the J-V characteristic that determines the theoretically possible efficiency of the solar cell. In this paper, using the connection between the dark J-V and photovoltaic (?-J{sub g}) efficiency – generated current density characteristics, the effect of current transport mechanisms in the space charge on the efficiency of multi-junction solar cells was investigated in the temperature range of 300 – 80 K. In the experimental J-V and ?-J{sub g} curves of the multi-junction solar cells, segments corresponding to the dominant current transport mechanisms were identified. The developed method, based on the analysis of forward dark J-V characteristics, makes it possible to identify the parameters affecting the efficiency of the multi-junction solar cells in a wide range of temperatures and solar radiation concentration.

  8. Structural Studies of Potential 1 eV Solar Cell Materials

    SciTech Connect (OSTI)

    Norman, A.; Al-Jassim, M.; Friedman, D.; Geisz, J.; Olson, J.; Kurtz, S.

    2000-01-01T23:59:59.000Z

    Structural studies using transmission electron microscopy have been made on 1-eV band-gap materials, lattice-matched to GaAs and Ge substrates, grown by metal-organic vapor-phase epitaxy for use in multijunction, high-efficiency solar cells.

  9. Heterojunction for Multi-Junction Solar Cells - Energy Innovation Portal

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cn SunnybankD.jpgHanfordDepartment ofHeatHenry Hurwitz,HermannPhotovoltaic

  10. Voltage-matched multijunction solar cell architectures for integrating PV

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron SpinPrincetonUsing Maps1 -Visualizing Brain Metals in Healthtechnologies

  11. High-Efficiency Solar Cell Concepts: Physics, Materials, and Devices

    SciTech Connect (OSTI)

    Mascarenhas, A.; Francoeur, S.; Seong, M. J.; Fluegel, B.; Zhang, Y.; Wanlass, M. W.

    2005-01-01T23:59:59.000Z

    Over the past three decades, significant progress has been made in the area of high-efficiency multijunction solar cells, with the effort primarily directed at current-matched solar cells in tandem. The key materials issues here have been obtaining semiconductors with the required bandgaps for sequential absorption of light in the solar spectrum and that are lattice matched to readily available substrates. The GaInP/GaAs/Ge cell is a striking example of success achieved in this area. Recently, several new approaches for high-efficiency solar cell design have emerged, that involve novel methods for tailoring alloy bandgaps, as well as alternate technologies for hetero-epitaxy of III-V's on Si. The advantages and difficulties expected to be encountered with each approach will be discussed, addressing both the materials issues and device physics whilst contrasting them with other fourth-generation solar cell concepts.

  12. Nanocrystal Solar Cells

    E-Print Network [OSTI]

    Gur, Ilan

    2006-01-01T23:59:59.000Z

    of organic based solar cells and distinguish them from theirof nanocrystal-based solar cells. No one approach orNov, 2005). Chapter 4 Hybrid solar cells with 3-dimensional

  13. Nanocrystal Solar Cells

    E-Print Network [OSTI]

    Gur, Ilan

    2006-01-01T23:59:59.000Z

    Nov, 2005). Chapter 4 Hybrid solar cells with 3-dimensional5 All-inorganic nanocrystal solar cells 5.1 Introduction Inoperation of organic based solar cells and distinguish them

  14. Limiting and realistic efficiencies of multi-junction solar Photonic Materials Group, FOM institute AMOLF, Amsterdam

    E-Print Network [OSTI]

    Polman, Albert

    analysis of the single junction c-Si cell and the 5-junction Ge-(c-Si)-CZTS-(a-SiC)-GaP cell is performed

  15. Inverted Metamorphic Cell Development: Cooperative Research and Development Final Report, CRADA Number CRD-05-156

    SciTech Connect (OSTI)

    Wanlass, M.

    2012-05-01T23:59:59.000Z

    This CRADA targeted technology transfer of the inverted metamorphic multi-junction (IMM) solar cell innovation from NREL to Emcore Photovoltaics. The technology transfer was successfully completed. Additionally, NREL provided materials characterization of solar cell structures produced at Emcore.

  16. High Performance Photovoltaic Solar Cells: Cooperative Research and Development Final Report, CRADA Number CRD-05-169

    SciTech Connect (OSTI)

    Steiner, M.

    2012-07-01T23:59:59.000Z

    NREL will provide certified measurements of the conversion efficiency at high concentration for several multijunction solar cells that were fabricated by Cyrium Technologies. In an earlier phase of the CRADA, Cyrium provided epitaxially-grown material and NREL processed the samples into devices and measured the performance.

  17. NANOCOMPOSITE ENABLED SENSITIZED SOLAR CELL

    E-Print Network [OSTI]

    Phuyal, Dibya

    2012-01-01T23:59:59.000Z

    Solar Energy Materials and Solar Cells 93(10): 1728-1723,Solar Energy Materials and Solar Cells 92(8) 39. Sima, C.Y. , Warta, W. , Dunlop, E.D. Solar Cell efficiency tables (

  18. Thermal Management of Solar Cells

    E-Print Network [OSTI]

    Saadah, Mohammed Ahmed

    2013-01-01T23:59:59.000Z

    heat exchangers, and solar cells," Sci-Tech News, vol. 65,Solar Energy Materials and Solar Cells, vol. 86, pp. 451-Nanostructured Silicon- Based Solar Cells, 2013. X. C. Tong,

  19. Lattice-Mismatched GaAs/InGaAs Two-Junction Solar Cells by Direct Wafer Bonding

    SciTech Connect (OSTI)

    Tanabe, K.; Aiken, D. J.; Wanlass, M. W.; Morral, A. F.; Atwater, H. A.

    2006-01-01T23:59:59.000Z

    Direct bonded interconnect between subcells of a lattice-mismatched III-V compound multijunction cell would enable dislocation-free active regions by confining the defect network needed for lattice mismatch accommodation to tunnel junction interfaces, while metamorphic growth inevitably results in less design flexibility and lower material quality than is desirable. The first direct-bond interconnected multijunction solar cell, a two-terminal monolithic GaAs/InGaAs two-junction solar cell, is reported and demonstrates viability of direct wafer bonding for solar cell applications. The tandem cell open-circuit voltage was approximately the sum of the subcell open-circuit voltages. This achievement shows direct bonding enables us to construct lattice-mismatched III-V multijunction solar cells and is extensible to an ultrahigh efficiency InGaP/GaAs/InGaAsP/InGaAs four-junction cell by bonding a GaAs-based lattice-matched InGaP/GaAs subcell and an InP-based lattice-matched InGaAsP/InGaAs subcell. The interfacial resistance experimentally obtained for bonded GaAs/InP smaller than 0.10 Ohm-cm{sup 2} would result in a negligible decrease in overall cell efficiency of {approx}0.02%, under 1-sun illumination.

  20. Thermal Management of Solar Cells

    E-Print Network [OSTI]

    Saadah, Mohammed Ahmed

    2013-01-01T23:59:59.000Z

    cells by cooling and concentration techniques," inheat. Different techniques of cooling solar cells have been

  1. Standard Test Methods for Measurement of Electrical Performance and Spectral Response of Nonconcentrator Multijunction Photovoltaic Cells and Modules

    E-Print Network [OSTI]

    American Society for Testing and Materials. Philadelphia

    2010-01-01T23:59:59.000Z

    1.1 These test methods provide special techniques needed to determine the electrical performance and spectral response of two-terminal, multijunction photovoltaic (PV) devices, both cell and modules. 1.2 These test methods are modifications and extensions of the procedures for single-junction devices defined by Test Methods E948, E1021, and E1036. 1.3 These test methods do not include temperature and irradiance corrections for spectral response and current-voltage (I-V) measurements. Procedures for such corrections are available in Test Methods E948, E1021, and E1036. 1.4 These test methods may be applied to cells and modules intended for concentrator applications. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and ...

  2. Heterojunction solar cell

    DOE Patents [OSTI]

    Olson, J.M.

    1994-08-30T23:59:59.000Z

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

  3. Heterojunction solar cell

    DOE Patents [OSTI]

    Olson, Jerry M. (Lakewood, CO)

    1994-01-01T23:59:59.000Z

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

  4. NANOCOMPOSITE ENABLED SENSITIZED SOLAR CELL

    E-Print Network [OSTI]

    Phuyal, Dibya

    2012-01-01T23:59:59.000Z

    Y. , Warta, W. , Dunlop, E.D. Solar Cell efficiency tables (in dye-sensitized solar cells based on Tio2 nanocrystal/R. J. ; Nozik, A. J. Schottky Solar Cells Based on Colloidal

  5. Thermal Management of Solar Cells

    E-Print Network [OSTI]

    Saadah, Mohammed Ahmed

    2013-01-01T23:59:59.000Z

    Nanostructured Silicon- Based Solar Cells, 2013. X. C. Tong,heat exchangers, and solar cells," Sci-Tech News, vol. 65,in crystalline silicon solar cells," Renewable Energy, vol.

  6. Thermal Management of Solar Cells

    E-Print Network [OSTI]

    Saadah, Mohammed Ahmed

    2013-01-01T23:59:59.000Z

    output electricity. Solar cells panels that employ opticalsurfaces such as the solar cell back panel and a heat panelbe shaped as a flat panel below a solar cells array with fin

  7. NREL Measures IMM Solar Cell Performance for CPV (Fact Sheet), NREL Highlights, Science

    SciTech Connect (OSTI)

    Not Available

    2011-09-01T23:59:59.000Z

    New measurement capability supports the development of high-efficiency solar cells for concentrating photovoltaic (CPV) application. NREL scientists recently completed a set of measurements on the performance of an inverted metamorphic multijunction (IMM) solar cell as a function of concentration and cell operating temperature. The triple-junction cell had subcell bandgaps of 1.81, 1.40, and 1.00. Much of the work focused on developing and validating the measurement techniques (i.e., the spectral response of the three subcells was measured at five temperatures, and those data were used to properly adjust the solar simulators at each temperature). Multijunction concentrator solar cells are typically evaluated under flash illumination at 25 C, but this condition significantly underestimates the thermal load on the cell in an actual real-world module, where the steady-state concentrated illumination can raise the operating temperature to as high as 100 C. The NREL-developed measurement technique addresses this issue. This work demonstrated that the IMM cell has better temperature coefficients than its traditional upright, germanium-based, lattice-matched counterpart and will thus perform better in actual CPV applications. This new measurement capability will support NREL's development of IMM cells that are optimally designed for operation at temperatures relevant to actual systems operation.

  8. Bifacial solar cell with SnS absorber by vapor transport deposition

    SciTech Connect (OSTI)

    Wangperawong, Artit [Stanford University, Stanford, California 94305 (United States); Department of Electrical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangkok 10140 (Thailand); Hsu, Po-Chun; Yee, Yesheng; Herron, Steven M.; Clemens, Bruce M.; Cui, Yi; Bent, Stacey F., E-mail: sbent@stanford.edu [Stanford University, Stanford, California 94305 (United States)

    2014-10-27T23:59:59.000Z

    The SnS absorber layer in solar cell devices was produced by vapor transport deposition (VTD), which is a low-cost manufacturing method for solar modules. The performance of solar cells consisting of Si/Mo/SnS/ZnO/indium tin oxide (ITO) was limited by the SnS layer's surface texture and field-dependent carrier collection. For improved performance, a fluorine doped tin oxide (FTO) substrate was used in place of the Mo to smooth the topography of the VTD SnS and to make bifacial solar cells, which are potentially useful for multijunction applications. A bifacial SnS solar cell consisting of glass/FTO/SnS/CdS/ZnO/ITO demonstrated front- and back-side power conversion efficiencies of 1.2% and 0.2%, respectively.

  9. High-efficiency solar cell and method for fabrication

    DOE Patents [OSTI]

    Hou, H.Q.; Reinhardt, K.C.

    1999-08-31T23:59:59.000Z

    A high-efficiency 3- or 4-junction solar cell is disclosed with a theoretical AM0 energy conversion efficiency of about 40%. The solar cell includes p-n junctions formed from indium gallium arsenide nitride (InGaAsN), gallium arsenide (GaAs) and indium gallium aluminum phosphide (InGaAlP) separated by n-p tunnel junctions. An optional germanium (Ge) p-n junction can be formed in the substrate upon which the other p-n junctions are grown. The bandgap energies for each p-n junction are tailored to provide substantially equal short-circuit currents for each p-n junction, thereby eliminating current bottlenecks and improving the overall energy conversion efficiency of the solar cell. Additionally, the use of an InGaAsN p-n junction overcomes super-bandgap energy losses that are present in conventional multi-junction solar cells. A method is also disclosed for fabricating the high-efficiency 3- or 4-junction solar cell by metal-organic chemical vapor deposition (MOCVD). 4 figs.

  10. High-efficiency solar cell and method for fabrication

    DOE Patents [OSTI]

    Hou, Hong Q. (Albuquerque, NM); Reinhardt, Kitt C. (Albuquerque, NM)

    1999-01-01T23:59:59.000Z

    A high-efficiency 3- or 4-junction solar cell is disclosed with a theoretical AM0 energy conversion efficiency of about 40%. The solar cell includes p-n junctions formed from indium gallium arsenide nitride (InGaAsN), gallium arsenide (GaAs) and indium gallium aluminum phosphide (InGaAlP) separated by n-p tunnel junctions. An optional germanium (Ge) p-n junction can be formed in the substrate upon which the other p-n junctions are grown. The bandgap energies for each p-n junction are tailored to provide substantially equal short-circuit currents for each p-n junction, thereby eliminating current bottlenecks and improving the overall energy conversion efficiency of the solar cell. Additionally, the use of an InGaAsN p-n junction overcomes super-bandgap energy losses that are present in conventional multi-junction solar cells. A method is also disclosed for fabricating the high-efficiency 3- or 4-junction solar cell by metal-organic chemical vapor deposition (MOCVD).

  11. Superior radiation-resistant properties of InGaP/GaAs tandem solar cells

    SciTech Connect (OSTI)

    Yamaguchi, M.; Okuda, T.; Taylor, S.J.; Takamoto, T. [Toyota Technological Institute 2-12-1 Hisakata, Tempaku, Nagoya 468 (Japan)] [Toyota Technological Institute 2-12-1 Hisakata, Tempaku, Nagoya 468 (Japan); Ikeda, E.; Kurita, H. [Central Resource Laboratory, Japan Energy Company, Niizo-Minami, Toda, Saitama 335 (Japan)] [Central Resource Laboratory, Japan Energy Company, Niizo-Minami, Toda, Saitama 335 (Japan)

    1997-03-01T23:59:59.000Z

    The observation of minority-carrier injection-enhanced annealing of radiation damage to InGa{sub 0.5}P{sub 0.5}/GaAs tandem solar cells is reported. Radiation resistance of InGaP/GaAs tandem solar cells as is similar with GaAs-on-Ge cells have been confirmed with 1 MeV electron irradiations. Moreover, minority-carrier injection under light illumination and forward bias conditions is shown to enhance defect annealing in InGaP and to result in the recovery of InGaP/GaAs tandem solar cell properties. These results suggest that the InGaP/GaAs(/Ge) multijunction solar cells and InGaP-based devices have great potential for space applications. {copyright} {ital 1997 American Institute of Physics.}

  12. Thermal Management of Solar Cells

    E-Print Network [OSTI]

    Saadah, Mohammed Ahmed

    2013-01-01T23:59:59.000Z

    D. Mills, "Cooling of photovoltaic cells under concentratedelectric performance of a photovoltaic cells by cooling andSolar Cell A photovoltaic cell is a semiconductor that

  13. NANOCOMPOSITE ENABLED SENSITIZED SOLAR CELL

    E-Print Network [OSTI]

    Phuyal, Dibya

    2012-01-01T23:59:59.000Z

    551, 2005. 2. Graztel, M. Solar Energy Conversion by Dye-Y. , Warta, W. , Dunlop, E.D. Solar Cell efficiency tables (efficiency in dye-sensitized solar cells based on Tio2

  14. Intermediate Mirrors to Reach Theoretical Efficiency Limits of Multi-Bandgap Solar Cells

    E-Print Network [OSTI]

    Ganapati, Vidya; Yablonovitch, Eli

    2014-01-01T23:59:59.000Z

    Creating a single bandgap solar cell that approaches the Shockley-Queisser limit requires a highly reflective rear mirror. This mirror enhances the voltage of the solar cell by providing photons with multiple opportunities for escaping out the front surface. Efficient external luminescence is a pre-requisite for high voltage. Intermediate mirrors in a multijunction solar cell can enhance the voltage for each cell in the stack. These intermediate mirrors need to have the added function of transmitting the below bandgap photons to the next cell in the stack. In this work, we quantitatively establish the efficiency increase possible with the use of intermediate selective reflectors between cells in a tandem stack. The absolute efficiency increase can be up to ~6% in dual bandgap cells with optimal intermediate and rear mirrors. A practical implementation of an intermediate selective mirror is an air gap sandwiched by antireflection coatings. The air gap provides perfect reflection for angles outside the escape c...

  15. Nanocrystal Solar Cells

    SciTech Connect (OSTI)

    Gur, Ilan

    2006-12-15T23:59:59.000Z

    This dissertation presents the results of a research agenda aimed at improving integration and stability in nanocrystal-based solar cells through advances in active materials and device architectures. The introduction of 3-dimensional nanocrystals illustrates the potential for improving transport and percolation in hybrid solar cells and enables novel fabrication methods for optimizing integration in these systems. Fabricating cells by sequential deposition allows for solution-based assembly of hybrid composites with controlled and well-characterized dispersion and electrode contact. Hyperbranched nanocrystals emerge as a nearly ideal building block for hybrid cells, allowing the controlled morphologies targeted by templated approaches to be achieved in an easily fabricated solution-cast device. In addition to offering practical benefits to device processing, these approaches offer fundamental insight into the operation of hybrid solar cells, shedding light on key phenomena such as the roles of electrode-contact and percolation behavior in these cells. Finally, all-inorganic nanocrystal solar cells are presented as a wholly new cell concept, illustrating that donor-acceptor charge transfer and directed carrier diffusion can be utilized in a system with no organic components, and that nanocrystals may act as building blocks for efficient, stable, and low-cost thin-film solar cells.

  16. Photovoltaic solar cell

    DOE Patents [OSTI]

    Nielson, Gregory N; Okandan, Murat; Cruz-Campa, Jose Luis; Resnick, Paul J

    2013-11-26T23:59:59.000Z

    A photovoltaic solar cell for generating electricity from sunlight is disclosed. The photovoltaic solar cell comprises a plurality of spaced-apart point contact junctions formed in a semiconductor body to receive the sunlight and generate the electicity therefrom, the plurality of spaced-apart point contact junctions having a first plurality of regions having a first doping type and a second plurality of regions having a second doping type. In addition, the photovoltaic solar cell comprises a first electrical contact electrically connected to each of the first plurality of regions and a second electrical contact electrically connected to each of the second plurality of regions, as well as a passivation layer covering major surfaces and sidewalls of the photovoltaic solar cell.

  17. Photovoltaic solar cell

    DOE Patents [OSTI]

    Nielson, Gregory N; Cruz-Campa, Jose Luis; Okandan, Murat; Resnick, Paul J

    2014-05-20T23:59:59.000Z

    A photovoltaic solar cell for generating electricity from sunlight is disclosed. The photovoltaic solar cell comprises a plurality of spaced-apart point contact junctions formed in a semiconductor body to receive the sunlight and generate the electricity therefrom, the plurality of spaced-apart point contact junctions having a first plurality of regions having a first doping type and a second plurality of regions having a second doping type. In addition, the photovoltaic solar cell comprises a first electrical contact electrically connected to each of the first plurality of regions and a second electrical contact electrically connected to each of the second plurality of regions, as well as a passivation layer covering major surfaces and sidewalls of the photovoltaic solar cell.

  18. Solar cell array interconnects

    DOE Patents [OSTI]

    Carey, P.G.; Thompson, J.B.; Colella, N.J.; Williams, K.A.

    1995-11-14T23:59:59.000Z

    Electrical interconnects are disclosed for solar cells or other electronic components using a silver-silicone paste or a lead-tin (Pb-Sn) no-clean fluxless solder cream, whereby the high breakage of thin (<6 mil thick) solar cells using conventional solder interconnect is eliminated. The interconnects of this invention employs copper strips which are secured to the solar cells by a silver-silicone conductive paste which can be used at room temperature, or by a Pb-Sn solder cream which eliminates undesired residue on the active surfaces of the solar cells. Electrical testing using the interconnects of this invention has shown that no degradation of the interconnects developed under high current testing, while providing a very low contact resistance value. 4 figs.

  19. Solar cell array interconnects

    DOE Patents [OSTI]

    Carey, Paul G. (Mountain View, CA); Thompson, Jesse B. (Brentwood, CA); Colella, Nicolas J. (Livermore, CA); Williams, Kenneth A. (Livermore, CA)

    1995-01-01T23:59:59.000Z

    Electrical interconnects for solar cells or other electronic components using a silver-silicone paste or a lead-tin (Pb-Sn) no-clean fluxless solder cream, whereby the high breakage of thin (<6 mil thick) solar cells using conventional solder interconnect is eliminated. The interconnects of this invention employs copper strips which are secured to the solar cells by a silver-silicone conductive paste which can be used at room temperature, or by a Pb-Sn solder cream which eliminates undesired residue on the active surfaces of the solar cells. Electrical testing using the interconnects of this invention has shown that no degradation of the interconnects developed under high current testing, while providing a very low contact resistance value.

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

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

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

  1. Fabrication and Characterization of Organic Solar Cells

    E-Print Network [OSTI]

    Yengel, Emre

    2010-01-01T23:59:59.000Z

    Solar Energy Materials and Solar Cells. 2005;86(2):197-205.in LEDs [18-20] and solar cells [ 20, 21]. What makes thesesolar cells, hybrid solar cells and dye-sensitized solar

  2. Thermal Management of Solar Cells

    E-Print Network [OSTI]

    Saadah, Mohammed Ahmed

    2013-01-01T23:59:59.000Z

    is the ratio of the solar cell output power to the incidentmaximum power output at: The fill factor of a solar cell FFsolar cell temperature by about 15°C, which increases the output power

  3. Thermal Management of Solar Cells

    E-Print Network [OSTI]

    Saadah, Mohammed Ahmed

    2013-01-01T23:59:59.000Z

    ratio of the solar cell output power to the incident lightpower to operate the fan. Natural cooling is preferred for solar

  4. EE580 Solar Cells Todd J. Kaiser

    E-Print Network [OSTI]

    Kaiser, Todd J.

    7/21/2010 1 EE580 ­ Solar Cells Todd J. Kaiser · Lecture 06 · Solar Cell Materials & Structures 1Montana State University: Solar Cells Lecture 6: Solar Cells Solar Cell Technologies · A) Crystalline Silicon · B) Thin Film · C) Group III-IV Cells 2Montana State University: Solar Cells Lecture 6: Solar

  5. NANOCOMPOSITE ENABLED SENSITIZED SOLAR CELL

    E-Print Network [OSTI]

    Phuyal, Dibya

    2012-01-01T23:59:59.000Z

    efficiency in dye-sensitized solar cells based on Tio2Conversion by Dye-Sensitized Photovoltaic cells. InorganicConversion by Dye-Sensitized Photovoltaic Cells. Inorganic

  6. Fabrication and Characterization of Organic Solar Cells

    E-Print Network [OSTI]

    Yengel, Emre

    2010-01-01T23:59:59.000Z

    electrodes  for  dye? sensitized solar cells.  Nano solar cells and dye-sensitized solar cells. Figure 1-3 The

  7. Monolithic tandem solar cell

    SciTech Connect (OSTI)

    Wanlass, M.W.

    1989-11-03T23:59:59.000Z

    It is an object of the invention to provide a monolithic tandem photovoltaic solar cell which is highly radiation resistant and efficient; in which the energy bandgap of the lower subcell can be tailored for specific applications; solar cell comprising layers of InP and GaInAsP (or GaInAs), where said photovoltaic cell is useful, for example, in space power applications; having an improved power-to-mass ratio; in which subcells are lattice-matches; and are both two terminal and three terminal monolithic tandem photovoltaic solar cells. To achieve the foregoing and other objects and in accordance with the purpose of the present invention, as embodied and broadly described herein, the monolithic tandem photovoltaic solar cell may comprise; (a) an InP substrate having an upper surface; (b) a first photoactive subcell on the upper surface of the InP substrate; wherein the first subcell comprises GaInAs (which could include GaInAsP) and includes a homojunction; and (c) a second photoactive subcell on the first subcell; wherein the second subcell comprises InP and includes a homojunction. The cell is described in detail. 5 figs., 2 tabs.

  8. Monolithic tandem solar cell

    SciTech Connect (OSTI)

    Wanlass, M.W.

    1991-05-28T23:59:59.000Z

    This patent describes a single-crystal, monolithic, tandem, photovoltaic solar cell which includes an InP substrate having an upper and lower surfaces, a first photoactive subcell on the upper surface of the InP substrate, and a second photoactive subcell on the first subcell. The first photovoltaic subcell is GaInAsP of defined composition. The second subcell is InP. The two subcells are lattice matched. The solar cell can be provided as a two- terminal device or a three-terminal device.

  9. Monolithic tandem solar cell

    DOE Patents [OSTI]

    Wanlass, Mark W. (Golden, CO)

    1991-01-01T23:59:59.000Z

    A single-crystal, monolithic, tandem, photovoltaic solar cell is described which includes (a) an InP substrate having upper and lower surfaces, (b) a first photoactive subcell on the upper surface of the InP substrate, and (c) a second photoactive subcell on the first subcell. The first photoactive subcell is GaInAsP of defined composition. The second subcell is InP. The two subcells are lattice matched. The solar cell can be provided as a two-terminal device or a three-terminal device.

  10. Device characterization for design optimization of 4 junction inverted metamorphic concentrator solar cells

    SciTech Connect (OSTI)

    Geisz, John F.; France, Ryan M.; Steiner, Myles A.; Friedman, Daniel J. [National Renewable Energy Laboratory, Golden, CO 80401 (United States); García, Iván [National Renewable Energy Laboratory, Golden, CO 80401 USA and Instituto de Energía Solar, Universidad Politécnica de Madrid, Avda Complutense s/n, 28040 Madrid (Spain)

    2014-09-26T23:59:59.000Z

    Quantitative electroluminescence (EL) and luminescent coupling (LC) analysis, along with more conventional characterization techniques, are combined to completely characterize the subcell JV curves within a fourjunction (4J) inverted metamorphic solar cell (IMM). The 4J performance under arbitrary spectral conditions can be predicted from these subcell JV curves. The internal radiative efficiency (IRE) of each junction has been determined as a function of current density from the external radiative efficiency using optical modeling, but this required the accurate determination of the individual junction current densities during the EL measurement as affected by LC. These measurement and analysis techniques can be applied to any multijunction solar cell. The 4J IMM solar cell used to illustrate these techniques showed excellent junction quality as exhibited by high IRE and a one-sun AM1.5D efficiency of 36.3%. This device operates up to 1000 suns without limitations due to any of the three tunnel junctions.

  11. EE580 Solar Cells Todd J. Kaiser

    E-Print Network [OSTI]

    Kaiser, Todd J.

    7/21/2010 1 EE580 ­ Solar Cells Todd J. Kaiser · Lecture 08 · Solar Cell Characterization 1Montana State University: Solar Cells Lecture 8: Characterization Solar Cell Operation n Emitter p Base Rear completing the circuit 2Montana State University: Solar Cells Lecture 8: Characterization Solar Cell

  12. Nighttime solar cell

    SciTech Connect (OSTI)

    Parise, R.J.

    1998-07-01T23:59:59.000Z

    Currently photovoltaic (PV) cells convert solar energy into electrical energy at an efficiency of about 18%, with the maximum conversion rate taking place around noon on a cloudless day. In many applications, the PV cells are utilized to recharge a stand-by battery pack that provides electrical energy at night or on cloudy days. Increasing the utilization of the panel array area by producing electrical power at night will reduce the amount of required electrical energy storage for a given array size and increase system reliability. Thermoelectric generators (TEG) are solid state devices that convert thermal energy into electrical energy. Using the nighttime sky, or deep space, with an effective temperature of 3.5 K as a cold sink, the TEG presented here can produce electrical power at night. The hot junction is supplied energy by the ambient air temperature or some other warm temperature source. The cold junction of the TEG is insulated from the surroundings by a vacuum cell, improving its overall effectiveness. Combining the TEG with the PV cell, a unique solid state device is developed that converts electromagnetic radiant energy into usable electrical energy. The thermoelectric-photovoltaic (TEPV) cell, or the Nighttime Solar Cell, is a direct energy conversion device that produces electrical energy both at night and during the day.

  13. High efficiency, radiation-hard solar cells

    E-Print Network [OSTI]

    Ager III, J.W.; Walukiewicz, W.

    2004-01-01T23:59:59.000Z

    Solar Energy Mat. and Solar Cells 75, 261-9 (2003) andD. J. , “Advanced Space Solar Cells,” Prog. Photovolt: Res.Igari, and W. Warta, “Solar Cell Efficiency Tables (Version

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

    E-Print Network [OSTI]

    Romeo, Alessandro

    2007-01-01T23:59:59.000Z

    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

  15. Superlattice cascade solar cell

    SciTech Connect (OSTI)

    Wanlass, M.W.; Blakeslee, A.E.

    1982-09-01T23:59:59.000Z

    This paper reports progress toward realization of a new cascade solar cell structure whose chief advantages over other present concepts are: use of silicon for the substrate and low bandgap cell; avoidance of the necessity of lattice matching; and incorporation of a GaAs/GaP superlattice to enhance efficiency and provide a low-resistance connecting junction. Details of the design and operation of an OMCVD system for growing this structure are presented. Results of experiments to optimize layer thickness, compositional uniformity, and surface morphology are described.

  16. Multijunction photovoltaic device and fabrication method

    DOE Patents [OSTI]

    Arya, Rajeewa R. (Jamison, PA); Catalano, Anthony W. (Furlong, PA)

    1993-09-21T23:59:59.000Z

    A multijunction photovoltaic device includes first and second amorphous silicon PIN photovoltaic cells in a stacked arrangement. An interface layer, composed of a doped silicon compound, is disposed between the two cells and has a lower bandgap than the respective n- and p-type adjacent layers of the first and second cells. The interface layer forms an ohmic contact with the one or the adjacent cell layers of the same conductivity type, and a tunnel junction with the other of the adjacent cell layers. The disclosed device is fabricated by a glow discharge process.

  17. Solar cell module lamination process

    DOE Patents [OSTI]

    Carey, Paul G. (Mountain View, CA); Thompson, Jesse B. (Brentwood, CA); Aceves, Randy C. (Tracy, CA)

    2002-01-01T23:59:59.000Z

    A solar cell module lamination process using fluoropolymers to provide protection from adverse environmental conditions and thus enable more extended use of solar cells, particularly in space applications. A laminate of fluoropolymer material provides a hermetically sealed solar cell module structure that is flexible and very durable. The laminate is virtually chemically inert, highly transmissive in the visible spectrum, dimensionally stable at temperatures up to about 200.degree. C. highly abrasion resistant, and exhibits very little ultra-violet degradation.

  18. Improving Solar-Cell Efficiency

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

    2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed Improving Solar Cell Efficiency October 7, 2014 Bookmark and Share The two-dimensional grazing...

  19. NANOCOMPOSITE ENABLED SENSITIZED SOLAR CELL

    E-Print Network [OSTI]

    Phuyal, Dibya

    2012-01-01T23:59:59.000Z

    Gap NIR – Near Infrared DSSC – Dye Sensitized Solar Cell TiOinterplay among various DSSC components. DSSCs consist of ainvestigated. In a conventional DSSC, a thick semiconducting

  20. Monolithic tandem solar cell

    SciTech Connect (OSTI)

    Wanlass, Mark W. (Golden, CO)

    1994-01-01T23:59:59.000Z

    A single-crystal, monolithic, tandem, photovoltaic solar cell is described which includes (a) an InP substrate having upper and lower surfaces, (b) a first photoactive subcell on the upper surface of the InP substrate, (c) a second photoactive subcell on the first subcell; and (d) an optically transparent prismatic cover layer over the second subcell. The first photoactive subcell is GaInAsP of defined composition. The second subcell is InP. The two subcells are lattice matched.

  1. Monolithic tandem solar cell

    DOE Patents [OSTI]

    Wanlass, M.W.

    1994-06-21T23:59:59.000Z

    A single-crystal, monolithic, tandem, photovoltaic solar cell is described which includes (a) an InP substrate having upper and lower surfaces, (b) a first photoactive subcell on the upper surface of the InP substrate, (c) a second photoactive subcell on the first subcell; and (d) an optically transparent prismatic cover layer over the second subcell. The first photoactive subcell is GaInAsP of defined composition. The second subcell is InP. The two subcells are lattice matched. 9 figs.

  2. Minority-carrier injection-enhanced annealing of radiation damage to InGaP solar cells

    SciTech Connect (OSTI)

    Yamaguchi, M.; Okuda, T.; Taylor, S.J. [Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468 (Japan)] [Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468 (Japan)

    1997-04-01T23:59:59.000Z

    The observation of minority-carrier injection-enhanced annealing of radiation-induced defects in InGaP is reported. 1-MeV electron irradiation results demonstrate superior radiation-resistance of InGa{sub 0.5}P{sub 0.5} solar cells compared to GaAs-on-Ge cells. Moreover, minority-carrier injection under forward bias conditions is shown to enhance defect annealing in InGaP and to result in the recovery of InGaP solar cell properties. These results suggest that the radiation-resistance of InGaP-based devices such as InGaP/GaAs(/Ge) multijunction solar cells and InGaP(As) light-emitting devices is further improved under minority-carrier injection condition. {copyright} {ital 1997 American Institute of Physics.}

  3. The challenges of organic polymer solar cells

    E-Print Network [OSTI]

    Saif Addin, Burhan K. (Burhan Khalid)

    2011-01-01T23:59:59.000Z

    The technical and commercial prospects of polymer solar cells were evaluated. Polymer solar cells are an attractive approach to fabricate and deploy roll-to-roll processed solar cells that are reasonably efficient (total ...

  4. Organic Tandem Solar Cells: Design and Formation

    E-Print Network [OSTI]

    Chen, Chun-Chao

    2015-01-01T23:59:59.000Z

    Y. Wu, and G. Li, ?Polymer solar cells with enhanced open-tandem and triple-junction solar cells,? Materials, 2012, 5(molecules for high performance solar cells,” Advanced Energy

  5. Fabrication and Characterization of Organic Solar Cells

    E-Print Network [OSTI]

    Yengel, Emre

    2010-01-01T23:59:59.000Z

    Würfel P. Physics of solar cells : from principles to newgeneration photovoltaics: solar cells for 2020 and beyond.MB. INDIUM-PHOSPHIDE SOLAR-CELLS MADE BY ION- IMPLANTATION.

  6. Fabrication and Characterization of Organic Solar Cells

    E-Print Network [OSTI]

    Yengel, Emre

    2010-01-01T23:59:59.000Z

    Würfel P.  Physics of solar cells : from principles to new generation  photovoltaics:  solar  cells  for  2020  and Spitzer  MB.   INDIUM?PHOSPHIDE  SOLAR?CELLS  MADE  BY  ION?

  7. Commercialization of Novel Organic Solar Cells

    E-Print Network [OSTI]

    Kassegne, Samuel Kinde

    Commercialization of Novel Organic Solar Cells Master of Engineering Final Report Shanel C. Miller................................................................................................................... 12 2.1 How do Solar Cells Work?.................................................................................................. 12 2.2 Types of Solar Cells that Exist Today

  8. Nontoxic quantum dot research improves solar cells

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

    Nontoxic quantum dot research improves solar cells Nontoxic quantum dot research improves solar cells Solar cells made with low-cost, nontoxic copper-based quantum dots can achieve...

  9. Nanocrystal Solar Cells

    E-Print Network [OSTI]

    Gur, Ilan

    2006-01-01T23:59:59.000Z

    improving efficiencies of solar photovoltaic technologies.quantum efficiency (EQE) of the associated photovoltaic

  10. area solar cells: Topics by E-print Network

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

    Cells Lecture 6: Solar Cells Solar Cell Technologies A) Crystalline Silicon B) Thin Film C) Group III-IV Cells 2Montana State University: Solar Cells Lecture 6:...

  11. aluminium arsenide solar cells: Topics by E-print Network

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

    Cells Lecture 6: Solar Cells Solar Cell Technologies A) Crystalline Silicon B) Thin Film C) Group III-IV Cells 2Montana State University: Solar Cells Lecture 6:...

  12. Bulb mounting of solar cell

    SciTech Connect (OSTI)

    Thompson, M.E.

    1983-04-05T23:59:59.000Z

    An energy converting assembly is provided for parasiting of light from a fluorescent light bulb utilizing a solar cell. The solar cell is mounted on a base member elongated in the dimension of elongation of the fluorescent bulb, and electrical interconnections to the cell are provided. A flexible sheet of opaque material having a flat white interior reflective surface surrounds the fluorescent bulb and reflects light emitted from the bulb back toward the bulb and the solar cell. The reflective sheet is tightly held in contact with the bottom of the bulb by adhesive, a tie strap, an external clip, or the like.

  13. Solar Energy Materials & Solar Cells 90 (2006) 664677 Invited article

    E-Print Network [OSTI]

    Romeo, Alessandro

    2006-01-01T23:59:59.000Z

    Solar Energy Materials & Solar Cells 90 (2006) 664­677 Invited article Recent developments in evaporated CdTe solar cells G. Khrypunova , A. Romeob , F. Kurdesauc , D.L. Ba¨ tznerd , H. Zogge , A Abstract Recent developments in the technology of high vacuum evaporated CdTe solar cells are reviewed

  14. Un-Nanostructuring Solar Cells | ANSER Center | Argonne-Northwestern...

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

    Un-Nanostructuring Solar Cells Home > Research > ANSER Research Highlights > Un-Nanostructuring Solar Cells...

  15. Module level solutions to solar cell polarization

    DOE Patents [OSTI]

    Xavier, Grace (Fremont, CA), Li; Bo (San Jose, CA)

    2012-05-29T23:59:59.000Z

    A solar cell module includes interconnected solar cells, a transparent cover over the front sides of the solar cells, and a backsheet on the backsides of the solar cells. The solar cell module includes an electrical insulator between the transparent cover and the front sides of the solar cells. An encapsulant protectively packages the solar cells. To prevent polarization, the insulator has resistance suitable to prevent charge from leaking from the front sides of the solar cells to other portions of the solar cell module by way of the transparent cover. The insulator may be attached (e.g., by coating) directly on an underside of the transparent cover or be a separate layer formed between layers of the encapsulant. The solar cells may be back junction solar cells.

  16. Materials en Multi-junction Solar Cells to Push CPV Efficiencies Beyond 50%

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItemResearch > The EnergyCenter (LMI-EFRC) -PublicationsMaterialsceem.ucsb.edu/rss

  17. High-Intensity Silicon Vertical Multi-Junction Solar Cells | Department of

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't YourTransport(Fact Sheet), GeothermalGridHYDROGEND D e e p p a a r r t

  18. Nanowire-based All Oxide Solar Cells

    E-Print Network [OSTI]

    Yang, Peidong

    2009-01-01T23:59:59.000Z

    1999; 7: 471. 6) Rai, B.P. Solar Cells, 1988, 25, 265. 7)Paul, G.K. , Sakurai, T. , Solar Energy, 2006, 80, 715. 9)1999, 2) Green, M.A. , Solar Cells, 1982, Prentice-Hall,

  19. Solar Energy Materials & Solar Cells 91 (2007) 15991610 Improving solar cell efficiency using photonic band-gap materials

    E-Print Network [OSTI]

    Dowling, Jonathan P.

    Solar Energy Materials & Solar Cells 91 (2007) 1599­1610 Improving solar cell efficiency using) solar energy conversion systems (or solar cells) are the most widely used power systems. However and reliable solar-cell devices is presented. We show that due their ability to modify the spectral and angular

  20. EE580 Solar Cells Todd J. Kaiser

    E-Print Network [OSTI]

    Kaiser, Todd J.

    7/21/2010 1 EE580 ­ Solar Cells Todd J. Kaiser · Lecture 10 · Summary 1Montana State University: Solar Cells Lecture 10: Summary Summer 2010 Class Montana State University: Solar Cells Lecture 10: Summary 2 Solar Cell Operation n Emitter p Base Rear Contact Antireflection coating Absorption of photon

  1. Solar cell with back side contacts

    DOE Patents [OSTI]

    Nielson, Gregory N; Okandan, Murat; Cruz-Campa, Jose Luis; Resnick, Paul J; Wanlass, Mark Woodbury; Clews, Peggy J

    2013-12-24T23:59:59.000Z

    A III-V solar cell is described herein that includes all back side contacts. Additionally, the positive and negative electrical contacts contact compoud semiconductor layers of the solar cell other than the absorbing layer of the solar cell. That is, the positive and negative electrical contacts contact passivating layers of the solar cell.

  2. Dye-Sensitized Solar Cells

    Broader source: Energy.gov [DOE]

    DOE supports research and development projects aimed at increasing the efficiency and lifetime of dye-sensitized solar cells (DSSCs). Below are a list of current projects, summary of the benefits,...

  3. Multijunction photovoltaic device and method of manufacture

    DOE Patents [OSTI]

    Arya, Rejeewa R. (Jamison, PA); Catalano, Anthony W. (Boulder, CO); Bennett, Murray (Longhorne, PA)

    1995-04-04T23:59:59.000Z

    A multijunction photovoltaic device includes first, second, and third amorphous silicon p-i-n photovoltaic cells in a stacked arrangement. The intrinsic layers of the second and third cells are formed of a-SiGe alloys with differing ratios of Ge such that the bandgap of the intrinsic layers respectively decrease from the first uppermost cell to the third lowermost cell. An interface layer, composed of a doped silicon compound, is disposed between the two cells and has a lower bandgap than the respective n- and p-type adjacent layers of the first and second cells. The interface layer forms an ohmic contact with the one of the adjacent cell layers of the same conductivity type, and a tunnel junction with the other of the adjacent cell layers.

  4. Nanocrystal Solar Cells

    E-Print Network [OSTI]

    Gur, Ilan

    2006-01-01T23:59:59.000Z

    research on organic photovoltaic cells since small molecule10 years prior (4). Photovoltaic cells with an active layerof the associated photovoltaic cells. 2.4 Charge transport

  5. Optimized Designs and Materials for Nanostructure Based Solar Cells

    E-Print Network [OSTI]

    Shao, Qinghui

    2009-01-01T23:59:59.000Z

    band impact ionization and solar cell efficiency,” J. Appl.Solar Energy Materials and Solar Cells 92, 273, (2008). [28]third generation solar cells Solar cells may be formed using

  6. Solar-Hydrogen Fuel-Cell Vehicles

    E-Print Network [OSTI]

    DeLuchi, Mark A.; Ogden, Joan M.

    1993-01-01T23:59:59.000Z

    M. A. (1992). Hydrogen Fuel-Cell Vehicles. Re- koebensteinthan both. Solar-hydrogen and fuel-cell vehicles wouldberegulation. Solar-Hydrogen Fuel-Cell Vehicles MarkA. DeLuchi

  7. Solar cells with a twist Comments ( 35)

    E-Print Network [OSTI]

    Rogers, John A.

    Solar cells with a twist Article Comments ( 35) JULIE STEENHUYSEN REUTERS OCTOBER 7, 2008 AT 9:58 AM EDT CHICAGO -- U.S. researchers have found a way to make efficient silicon-based solar cells of buildings as opportunities for solar energy," Prof. Rogers said in a telephone interview. Solar cells, which

  8. Solar Energy Materials & Solar Cells 78 (2003) 567595 Low-mobility solar cells: a device physics primer

    E-Print Network [OSTI]

    Schiff, Eric A.

    Solar Energy Materials & Solar Cells 78 (2003) 567­595 Low-mobility solar cells: a device physics, Syracuse, New York 13244-1130, USA Abstract The properties of pin solar cells based on photogeneration for the solar conversion efficiency of amorphous silicon-based cells that are limited by valence bandtail

  9. Thermodynamics, Entropy, Information and the Efficiency of Solar Cells

    E-Print Network [OSTI]

    Abrams, Zeev R.

    2012-01-01T23:59:59.000Z

    of analytical expressions for solar cell fill factors.Solar Cells 7, 31. A. Luque and V. Andreev, Concentratorenergy gap terrestrial solar cells. J. Appl. Phys. 51,

  10. Berkeley Lab Sheds Light on Improving Solar Cell Efficiency

    E-Print Network [OSTI]

    Lawrence Berkeley National Laboratory

    2007-01-01T23:59:59.000Z

    light on improving solar cell efficiency Ernest Orlandomanufacturing methods produce solar cells with an efficiencythe impaired performance of solar cells manufactured from

  11. Oligo and Poly-thiophene/Zno Hybrid Nanowire Solar Cells

    E-Print Network [OSTI]

    Briseno, Alejandro L.

    2010-01-01T23:59:59.000Z

    ZnO Hybrid Nanowire Solar Cells Alejandro L. Briseno, Thomashybrid single nanowire solar cell. End-functionalized oligo-Individual nanowire solar cell devices exhibited well-

  12. Organic Solar Cells: Absolute Measurement of Domain Composition...

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

    Organic Solar Cells: Absolute Measurement of Domain Composition and Nanoscale Size Distribution Explains Performance in Solar Cells Organic Solar Cells: Absolute Measurement of...

  13. Development of concentrator solar cells

    SciTech Connect (OSTI)

    Not Available

    1994-08-01T23:59:59.000Z

    A limited pilot production run on PESC silicon solar cells for use at high concentrations (200 to 400 suns) is summarized. The front contact design of the cells was modified for operation without prismatic covers. The original objective of the contract was to systematically complete a process consolidation phase, in which all the, process improvements developed during the contract would be combined in a pilot production run. This pilot run was going to provide, a basis for estimating cell costs when produced at high throughput. Because of DOE funding limitations, the Photovoltaic Concentrator Initiative is on hold, and Applied Solar`s contract was operated at a low level of effort for most of 1993. The results obtained from the reduced scope pilot run showed the effects of discontinuous process optimization and characterization. However, the run provided valuable insight into the technical areas that can be optimized to achieve the original goals of the contract.

  14. (Melanin-Sensitized Solar Cell) : 696220016

    E-Print Network [OSTI]

    the majority dye-sensitized solar cell research all uses the Ruthenium-complex as a light harvester. Dye-sensitized solar cell, DSSC 1991GrätzelDSSC[1] DSSCGrätzel cellDSSC polypyridyl complexes (Melanin-Sensitized Solar Cell) : : : 696220016 #12; #12;#12; #12;I PLD

  15. Advanced Materials and Nano Technology for Solar Cells

    E-Print Network [OSTI]

    Han, Tao

    2014-01-01T23:59:59.000Z

    Solar Energy Materials and Solar Cells 93.6 (2009): 670-673.1-3: The structure diagram of c-Si solar cell and HIT solarof flexible CIGS solar cells and modules." Solar Energy

  16. The Growth of InGaAsN for High Efficiency Solar Cells by Metalorganic Chemical Vapor Deposition

    SciTech Connect (OSTI)

    ALLERMAN,ANDREW A.; BANKS,JAMES C.; GEE,JAMES M.; JONES,ERIC D.; KURTZ,STEVEN R.

    1999-09-16T23:59:59.000Z

    InGaAsN alloys are a promising material for increasing the efficiency of multi-junction solar cells now used for satellite power systems. However, the growth of these dilute N containing alloys has been challenging with further improvements in material quality needed before the solar cell higher efficiencies are realized. Nitrogen/V ratios exceeding 0.981 resulted in lower N incorporation and poor surface morphologies. The growth rate was found to depend on not only the total group III transport for a fixed N/V ratio but also on the N/V ratio. Carbon tetrachloride and dimethylzinc were effective for p-type doping. Disilane was not an effective n-type dopant while SiCl4 did result in n-type material but only a narrow range of electron concentrations (2-5e17cm{sup -3}) were achieved.

  17. Fabrication and Characterization of Organic Solar Cells

    E-Print Network [OSTI]

    Yengel, Emre

    2010-01-01T23:59:59.000Z

    CdTe/CdS thin-film solar cells. Sol Energ Mat Sol C. 2000;p/n-junction solar cells. Sol Energ Mat Sol C. Wohrle D,

  18. Biomimetic Dye Molecules for Solar Cells

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

    provide opportunities for solid-state physicists and chemists to solve a major challenge: solar cell adoption. Though solar cells can use energy directly from the Sun to produce...

  19. Key Physical Mechanisms in Nanostructured Solar Cells

    SciTech Connect (OSTI)

    Dr Stephan Bremner

    2010-07-21T23:59:59.000Z

    The objective of the project was to study both theoretically and experimentally the excitation, recombination and transport properties required for nanostructured solar cells to deliver energy conversion efficiencies well in excess of conventional limits. These objectives were met by concentrating on three key areas, namely, investigation of physical mechanisms present in nanostructured solar cells, characterization of loss mechanisms in nanostructured solar cells and determining the properties required of nanostructured solar cells in order to achieve high efficiency and the design implications.

  20. EE580 Solar Cells Todd J. Kaiser

    E-Print Network [OSTI]

    Kaiser, Todd J.

    7/21/2010 1 EE580 ­ Solar Cells Todd J. Kaiser · Lecture 05 · P-N Junction 1Montana State University: Solar Cells Lecture 5: P-N Junction P-N Junction · Solar Cell is a large area P-N junction electron (hole) positive) 2Montana State University: Solar Cells Lecture 5: P-N Junction p-n Junction p n P

  1. Pokeberries Provide Boost for Solar Cells

    Broader source: Energy.gov [DOE]

    Red dye from the pokeberry weed makes their low-cost, fiber-based solar cells even more energy efficient.

  2. Process of making solar cell module

    DOE Patents [OSTI]

    Packer, M.; Coyle, P.J.

    1981-03-09T23:59:59.000Z

    A process is presented for the manufacture of solar cell modules. A solution comprising a highly plasticized polyvinyl butyral is applied to a solar cell array. The coated array is dried and sandwiched between at last two sheets of polyvinyl butyral and at least two sheets of a rigid transparent member. The sandwich is laminated by the application of heat and pressure to cause fusion and bonding of the solar cell array with the rigid transparent members to produce a solar cell module.

  3. Core-Shell Nanopillar Array Solar Cells using Cadmium Sulfide Coating on Indium Phosphide Nanopillars

    E-Print Network [OSTI]

    Tu, Bor-An Clayton

    2013-01-01T23:59:59.000Z

    Monocrystalline silicon solar cells, polycrystalline silicon solar cells, and amorphous silicon (thin-film) solar

  4. EE580 Solar Cells Todd J. Kaiser

    E-Print Network [OSTI]

    Kaiser, Todd J.

    7/21/2010 1 EE580 ­ Solar Cells Todd J. Kaiser · Lecture 09 · Photovoltaic Systems 1Montana State University: Solar Cells Lecture 9: PV Systems Several types of operating modes · Centralized power plant or wanted Montana State University: Solar Cells Lecture 9: PV Systems 2 Residential Side Mounted Montana

  5. EE580 Solar Cells Todd J. Kaiser

    E-Print Network [OSTI]

    Kaiser, Todd J.

    7/21/2010 1 EE580 ­ Solar Cells Todd J. Kaiser · Lecture 02 Microfabrication ­ A combination · Photolithograpy · Depostion · Etching 1 Montana State University: Solar Cells Lecture 2: Microfabrication Flow Montana State University: Solar Cells Lecture 2: Microfabrication Questions · What is heat? · Heat

  6. Accurate performance measurement of silicon solar cells

    E-Print Network [OSTI]

    accuracy. The light source is very important when calibrating solar cells. Commonly used light sourcesAccurate performance measurement of silicon solar cells William Murray Keogh July 2001 A thesis is an important part of the solar cell manufacturing process. Two classes of measurement can be considered

  7. Nanowire-based All Oxide Solar Cells

    E-Print Network [OSTI]

    Yang, Peidong

    2009-01-01T23:59:59.000Z

    7: 471. 6) Rai, B.P. Solar Cells, 1988, 25, 265. 7) Minami,1999, 2) Green, M.A. , Solar Cells, 1982, Prentice-Hall,of ZnO nanowire array used in solar cells, prior to Cu 2 O

  8. EE580 Solar Cells Todd J. Kaiser

    E-Print Network [OSTI]

    Kaiser, Todd J.

    7/21/2010 1 EE580 ­ Solar Cells Todd J. Kaiser · Lecture 07 · EE Fundamentals 1Montana State University: Solar Cells Lecture 7: EE Fundamentals What is Electrical Engineering · Opposite of lightning · Symbolic information: electronics Montana State University: Solar Cells Lecture 7: EE Fundamentals 2 Review

  9. EE580 Solar Cells Todd J. Kaiser

    E-Print Network [OSTI]

    Kaiser, Todd J.

    7/21/2010 1 EE580 ­ Solar Cells Todd J. Kaiser · Lecture 04 · Semiconductor Materials · Chapter 1 1Montana State University: Solar Cells Lecture 4: Semiconductor Materials Semiconductor Bond Model · Bohr electrons interact to form bonds 2Montana State University: Solar Cells Lecture 4: Semiconductor Materials

  10. Detailed balance analysis of nanophotonic solar cells

    E-Print Network [OSTI]

    Fan, Shanhui

    Detailed balance analysis of nanophotonic solar cells Sunil Sandhu, Zongfu Yu, and Shanhui Fan-voltage characteristic modeling of nanophotonic solar cells. This approach takes into account the intrinsic material non-idealities, and is useful for determining the theoretical limit of solar cell efficiency for a given structure. Our approach

  11. EE580 Solar Cells Todd J. Kaiser

    E-Print Network [OSTI]

    Kaiser, Todd J.

    7/21/2010 1 EE580 ­ Solar Cells Todd J. Kaiser · Lecture 03 · Nature of Sunlight 1Montana State University: Solar Cells Lecture 3: Nature of Sunlight Wave-Particle Duality · Light acts as ­ Waves University: Solar Cells Lecture 3: Nature of Sunlight Properties of Light · Sunlight contains photons of many

  12. Optimized Designs and Materials for Nanostructure Based Solar Cells

    E-Print Network [OSTI]

    Shao, Qinghui

    2009-01-01T23:59:59.000Z

    electrodes for dye-sensitized solar cells,” Nano Lett. 8 (electrodes for dye-sensitized solar cells,” Nano Letters 8,

  13. When Function Follows Form: Plastic Solar Cells | ANSER Center...

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

    When Function Follows Form: Plastic Solar Cells Home > Research > ANSER Research Highlights > When Function Follows Form: Plastic Solar Cells...

  14. Ames Lab 101: Improving Solar Cell Efficiency

    ScienceCinema (OSTI)

    Biswas, Rana

    2012-08-29T23:59:59.000Z

    Rana Biswas, a scientist with the Ames Laboratory, discusses his team's research in creating more efficient solar cells and working with Iowa Thin Film to produce these cells.

  15. NANO REVIEW Enhancing Solar Cell Efficiencies through 1-D Nanostructures

    E-Print Network [OSTI]

    Chen, Junhong

    include dye-sensitized solar cells, quantum- dot-sensitized solar cells, and p-n junction solar cells their efficiencies more practical. Now the third-generation solar cells, such as dye-sensitized solar cells (DSSCsNANO REVIEW Enhancing Solar Cell Efficiencies through 1-D Nanostructures Kehan Yu Ă? Junhong Chen

  16. Mixed ternary heterojunction solar cell

    DOE Patents [OSTI]

    Chen, Wen S. (Seattle, WA); Stewart, John M. (Seattle, WA)

    1992-08-25T23:59:59.000Z

    A thin film heterojunction solar cell and a method of making it has a p-type layer of mixed ternary I-III-VI.sub.2 semiconductor material in contact with an n-type layer of mixed binary II-VI semiconductor material. The p-type semiconductor material includes a low resistivity copper-rich region adjacent the back metal contact of the cell and a composition gradient providing a minority carrier mirror that improves the photovoltaic performance of the cell. The p-type semiconductor material preferably is CuInGaSe.sub.2 or CuIn(SSe).sub.2.

  17. High-Efficiency Solar Cells for Large-Scale Electricity Generation & Design Considerations for the Related Optics (Presentation)

    SciTech Connect (OSTI)

    Kurtz, S.; Olson, J.; Geisz, J.; Friedman, D.; McMahon, W.; Ptak, A.; Wanlass, M.k; Kibbler, A.; Kramer, C.; Ward, S.; Duda, A.; Young, M.; Carapella, J.

    2007-09-17T23:59:59.000Z

    The photovoltaic industry has been growing exponentially at an average rate of about 35%/year since 1979. Recently, multijunction concentrator cell efficiencies have surpassed 40%. Combined with concentrating optics, these can be used for electricity generation.

  18. Solar cells Improved Hybrid Solar Cells via in situ UV Polymerization

    E-Print Network [OSTI]

    Sibener, Steven

    Solar cells Improved Hybrid Solar Cells via in situ UV Polymerization Sanja Tepavcevic, Seth B-enhanced solar energy conversion. By using this simple in situ UV polymerization method that couples mobility of the photoactive layer can be enhanced. 1. Introduction Hybrid solar cells have been developed

  19. Solar Cells, 3 (1981) 337 -340 337 HIGH EFFICIENCY BIFACIAL BACK SURFACE FIELD SOLAR CELLS

    E-Print Network [OSTI]

    del Alamo, JesĂşs A.

    . CUEVAS, A. LUQUE, J. EGUREN and J. DEL ALAMO Instituto de Energia Solar, Escuela Tdcnica Superior deSolar Cells, 3 (1981) 337 - 340 337 HIGH EFFICIENCY BIFACIAL BACK SURFACE FIELD SOLAR CELLS A solar cells are presented. Effi- ciencies of 15.7% and 13.6% were measured under front and back air mass

  20. Spectral sensitization of nanocrystalline solar cells

    DOE Patents [OSTI]

    Spitler, Mark T. (Concord, MA); Ehret, Anne (Malden, MA); Stuhl, Louis S. (Bedford, MA)

    2002-01-01T23:59:59.000Z

    This invention relates to dye sensitized polycrystalline photoelectrochemical solar cells for use in energy transduction from light to electricity. It concerns the utility of highly absorbing organic chromophores as sensitizers in such cells and the degree to which they may be utilized alone and in combination to produce an efficient photoelectrochemical cell, e.g., a regenerative solar cell.

  1. Three-junction solar cell

    DOE Patents [OSTI]

    Ludowise, Michael J. (Cupertino, CA)

    1986-01-01T23:59:59.000Z

    A photovoltaic solar cell is formed in a monolithic semiconductor. The cell contains three junctions. In sequence from the light-entering face, the junctions have a high, a medium, and a low energy gap. The lower junctions are connected in series by one or more metallic members connecting the top of the lower junction through apertures to the bottom of the middle junction. The upper junction is connected in voltage opposition to the lower and middle junctions by second metallic electrodes deposited in holes 60 through the upper junction. The second electrodes are connected to an external terminal.

  2. Final Report: Tunable Narrow Band Gap Absorbers For Ultra High Efficiency Solar Cells

    SciTech Connect (OSTI)

    Bedair, Salah M. [NCSU; Hauser, John R. [NCSU; Elmasry, Nadia [NCSU; Colter, Peter C. [NCSU; Bradshaw, G. [NCSU; Carlin, C. Z. [NCSU; Samberg, J. [NCSU; Edmonson, Kenneth [Spectrolab

    2012-07-31T23:59:59.000Z

    We report on a joint research program between NCSU and Spectrolab to develop an upright multijunction solar cell structure with a potential efficiency exceeding the current record of 41.6% reported by Spectrolab. The record efficiency Ge/GaAs/InGaP triple junction cell structure is handicapped by the fact that the current generated by the Ge cell is much higher than that of both the middle and top cells. We carried out a modification of the record cell structure that will keep the lattice matched condition and allow better matching of the current generated by each cell. We used the concept of strain balanced strained layer superlattices (SLS), inserted in the i-layer, to reduce the bandgap of the middle cell without violating the desirable lattice matched condition. For the middle GaAs cell, we have demonstrated an n-GaAs/i-(InGaAs/GaAsP)/p-GaAs structure, where the InxGa1-xAs/GaAs1-yPy SLS is grown lattice matched to GaAs and with reduced bandgap from 1.43 eV to 1.2 eV, depending upon the values of x and y.

  3. Planar micro-optic solar concentration

    E-Print Network [OSTI]

    Karp, Jason Harris

    2010-01-01T23:59:59.000Z

    35), "Progress in Photovoltaics: Research and Applications1 GW of concentrator photovoltaics using multijunction solarG. , “Technology Focus: Photovoltaics”, Nature Photonics, 2,

  4. Investigation of the Role of Trap States in Solar Cell Reliability using Photothermal Deflection Spectroscopy

    E-Print Network [OSTI]

    Bezryadina, Anna Sergeyevna

    2012-01-01T23:59:59.000Z

    organic, hybrid and dye sensitized solar cells took place insolar cells, dye-sensitized solar cells, solar inks using

  5. Bypass diode for a solar cell

    DOE Patents [OSTI]

    Rim, Seung Bum (Palo Alto, CA); Kim, Taeseok (San Jose, CA); Smith, David D. (Campbell, CA); Cousins, Peter J. (Menlo Park, CA)

    2012-03-13T23:59:59.000Z

    Bypass diodes for solar cells are described. In one embodiment, a bypass diode for a solar cell includes a substrate of the solar cell. A first conductive region is disposed above the substrate, the first conductive region of a first conductivity type. A second conductive region is disposed on the first conductive region, the second conductive region of a second conductivity type opposite the first conductivity type.

  6. Solar Cell Modules With Improved Backskin

    DOE Patents [OSTI]

    Gonsiorawski, Ronald C. (Danvers, MA)

    2003-12-09T23:59:59.000Z

    A laminated solar cell module comprises a front light transmitting support, a plurality of interconnected solar cells encapsulated by a light-transmitting encapsulant material, and an improved backskin formed of an ionomer/nylon alloy. The improved backskin has a toughness and melting point temperature sufficiently great to avoid any likelihood of it being pierced by any of the components that interconnect the solar cells.

  7. Very High Efficiency Solar Cell Modules

    SciTech Connect (OSTI)

    Barnett, A.; Kirkpatrick, D.; Honsberg, C.; Moore, D.; Wanlass, M.; Emery, K.; Schwartz, R.; Carlson, D.; Bowden, S.; Aiken, D.; Gray, A.; Kurtz, S.; Kazmerski, L., et al

    2009-01-01T23:59:59.000Z

    The Very High Efficiency Solar Cell (VHESC) program is developing integrated optical system - PV modules for portable applications that operate at greater than 50% efficiency. We are integrating the optical design with the solar cell design, and have entered previously unoccupied design space. Our approach is driven by proven quantitative models for the solar cell design, the optical design, and the integration of these designs. Optical systems efficiency with an optical efficiency of 93% and solar cell device results under ideal dichroic splitting optics summing to 42.7 {+-} 2.5% are described.

  8. Fabrication and Characterization of Organic Solar Cells

    E-Print Network [OSTI]

    Yengel, Emre

    2010-01-01T23:59:59.000Z

    MA. Third generation photovoltaics: solar cells for 2020 andNS. Organic photovoltaics : mechanisms, materials, andtables (Version 27). Prog Photovoltaics. 2006;14(1):45-51.

  9. Fabrication and Characterization of Organic Solar Cells

    E-Print Network [OSTI]

    Yengel, Emre

    2010-01-01T23:59:59.000Z

    York: Wiley; 1998. Short circuit current of a solar cell [circuit voltage, short circuit current and maximum powerinterface. (ii) Short circuit current (I sc ); In the ideal

  10. Pennsylvania Company Develops Solar Cell Printing Technology

    Broader source: Energy.gov [DOE]

    The technology uses Plextronics’ conductive inks that can be printed by manufacturers worldwide to make solar cells, potentially as easily as they might print a newspaper.

  11. Improved monolithic tandem solar cell

    SciTech Connect (OSTI)

    Wanlass, M.W.

    1991-04-23T23:59:59.000Z

    A single-crystal, monolithic, tandem, photovoltaic solar cell is described which includes (a) an InP substrate having upper and lower surfaces, (b) a first photoactive subcell on the upper surf ace of the InP substrate, (c) a second photoactive subcell on the first subcell; and (d) an optically transparent prismatic cover layer over the second subcell. The first photoactive subcell is GaInAsP of defined composition. The second subcell is InP. The two subcells are lattice matched.

  12. Solar Cells | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnualProperty Edit with form HistoryRistmaSinosteel CorporationSocovoltaicSolaer saSolar Cells Jump

  13. Direct-bonded GaAs/InGaAs tandem solar cell Katsuaki Tanabe,a

    E-Print Network [OSTI]

    Atwater, Harry

    , Pasadena, California 91125 Daniel J. Aiken Emcore Photovoltaics, Albuquerque, New Mexico 87123 Mark W. The direct-bonded interconnect between subcells of this two-junction cell enables monolithic interconnection- proach is to employ direct-bonded interconnects between subcells of a multijunction cell, which enables

  14. Front contact solar cell with formed emitter

    DOE Patents [OSTI]

    Cousins, Peter John

    2014-11-04T23:59:59.000Z

    A bipolar solar cell includes a backside junction formed by an N-type silicon substrate and a P-type polysilicon emitter formed on the backside of the solar cell. An antireflection layer may be formed on a textured front surface of the silicon substrate. A negative polarity metal contact on the front side of the solar cell makes an electrical connection to the substrate, while a positive polarity metal contact on the backside of the solar cell makes an electrical connection to the polysilicon emitter. An external electrical circuit may be connected to the negative and positive metal contacts to be powered by the solar cell. The positive polarity metal contact may form an infrared reflecting layer with an underlying dielectric layer for increased solar radiation collection.

  15. Front contact solar cell with formed emitter

    DOE Patents [OSTI]

    Cousins, Peter John (Menlo Park, CA)

    2012-07-17T23:59:59.000Z

    A bipolar solar cell includes a backside junction formed by an N-type silicon substrate and a P-type polysilicon emitter formed on the backside of the solar cell. An antireflection layer may be formed on a textured front surface of the silicon substrate. A negative polarity metal contact on the front side of the solar cell makes an electrical connection to the substrate, while a positive polarity metal contact on the backside of the solar cell makes an electrical connection to the polysilicon emitter. An external electrical circuit may be connected to the negative and positive metal contacts to be powered by the solar cell. The positive polarity metal contact may form an infrared reflecting layer with an underlying dielectric layer for increased solar radiation collection.

  16. High-Efficiency, Self-Concentrating Nanoscale Solar Cell - Energy...

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

    Solar Photovoltaic Solar Photovoltaic Find More Like This Return to Search High-Efficiency, Self-Concentrating Nanoscale Solar Cell Lawrence Berkeley National Laboratory Contact...

  17. Method for processing silicon solar cells

    DOE Patents [OSTI]

    Tsuo, Y. Simon (Golden, CO); Landry, Marc D. (Lafayette, CO); Pitts, John R. (Lakewood, CO)

    1997-01-01T23:59:59.000Z

    The instant invention teaches a novel method for fabricating silicon solar cells utilizing concentrated solar radiation. The solar radiation is concentrated by use of a solar furnace which is used to form a front surface junction and back-surface field in one processing step. The present invention also provides a method of making multicrystallline silicon from amorphous silicon. The invention also teaches a method of texturing the surface of a wafer by forming a porous silicon layer on the surface of a silicon substrate and a method of gettering impurities. Also contemplated by the invention are methods of surface passivation, forming novel solar cell structures, and hydrogen passivation.

  18. Method for processing silicon solar cells

    DOE Patents [OSTI]

    Tsuo, Y.S.; Landry, M.D.; Pitts, J.R.

    1997-05-06T23:59:59.000Z

    The instant invention teaches a novel method for fabricating silicon solar cells utilizing concentrated solar radiation. The solar radiation is concentrated by use of a solar furnace which is used to form a front surface junction and back-surface field in one processing step. The present invention also provides a method of making multicrystalline silicon from amorphous silicon. The invention also teaches a method of texturing the surface of a wafer by forming a porous silicon layer on the surface of a silicon substrate and a method of gettering impurities. Also contemplated by the invention are methods of surface passivation, forming novel solar cell structures, and hydrogen passivation. 2 figs.

  19. Enhancing solar cells with plasmonic nanovoids

    E-Print Network [OSTI]

    Lal, Niraj Narsey

    2012-07-03T23:59:59.000Z

    This thesis explores the use of plasmonic nanovoids for enhancing the efficiency of thin-film solar cells. Devices are fabricated inside plasmonically resonant nanostructures, demonstrating a new class of plasmonic photovoltaics. Novel cell...

  20. Low-Cost Photovoltaics: Luminescent Solar Concentrators And Colloidal Quantum Dot Solar Cells

    E-Print Network [OSTI]

    Leow, Shin Woei

    2014-01-01T23:59:59.000Z

    enhancing the efficiency of solar cells and extending theirA. J. Nozik, “Quantum dot solar cells,” Phys. E Low-Dimens.oxide PbS quantum dot solar cells at low temperature,” Appl.

  1. Low-Cost Photovoltaics: Luminescent Solar Concentrators And Colloidal Quantum Dot Solar Cells

    E-Print Network [OSTI]

    Leow, Shin Woei

    2014-01-01T23:59:59.000Z

    1.6 Schematic of a solar panel with PV cells connected inand installation cost of solar panels and enhance PV cell1.6 Schematic of a solar panel with PV cells connected in

  2. Sensitized energy transfer for organic solar cells, optical solar concentrators, and solar pumped lasers

    E-Print Network [OSTI]

    Reusswig, Philip David

    2014-01-01T23:59:59.000Z

    The separation of chromophore absorption and excitonic processes, such as singlet exciton fission and photoluminescence, offers several advantages to the design of organic solar cells and luminescent solar concentrators ...

  3. Thermodynamics, Entropy, Information and the Efficiency of Solar Cells

    E-Print Network [OSTI]

    Abrams, Zeev R.

    2012-01-01T23:59:59.000Z

    At Silicon Solar Cell Performance. Energ. Conv. 11, 63 (efficiency of solar cells. Sol. Energ. Mat. Sol. C. 139. E.Solar Cells: Comparison between Carrier Multiplication and Down- Conversion, Sol. Energ.

  4. Highly Mismatched Alloys for Intermediate Band Solar Cells

    E-Print Network [OSTI]

    2005-01-01T23:59:59.000Z

    for Intermediate Band Solar Cells W. Walukiewicz 1 , K. M.single-junction intermediate band solar cells. Figure 5:conversion efficiency for a solar cell fabricated from a Zn

  5. Molecular solution processing of metal chalcogenide thin film solar cells

    E-Print Network [OSTI]

    Yang, Wenbing

    2013-01-01T23:59:59.000Z

    3-6,3-7] Chalcopyrite CIGS solar cells, without introducingperformance CISS and CIGS solar cells with efficiencies uptellurium might impede CIGS/CdTe solar cells from reaching

  6. CRADA Final Report: Process development for hybrid solar cells

    E-Print Network [OSTI]

    Ager, Joel W

    2011-01-01T23:59:59.000Z

    development for hybrid solar cells Summary of the specific20 wafers with full tandem solar cell test structure perNitride/Silicon Tandem Solar Cell,” Appl. Phys. Express 2

  7. Thermodynamics, Entropy, Information and the Efficiency of Solar Cells

    E-Print Network [OSTI]

    Abrams, Zeev R.

    2012-01-01T23:59:59.000Z

    91, 43. T. Markvart, Solar cell as a heat engine: energy–Tiedje, Physical Limits to Solar Cell Efficiency, in EnergyThe Carnot Factor in Solar-Cell Theory. Solid State

  8. Optimized Designs and Materials for Nanostructure Based Solar Cells

    E-Print Network [OSTI]

    Shao, Qinghui

    2009-01-01T23:59:59.000Z

    the intermediate band solar cell under nonideal space chargeInGaP/GaAs tandem solar cells,” Appl. Phys. Lett. 70, 381 (band impact ionization and solar cell efficiency,” J. Appl.

  9. Quantum Junction Solar Cells Jiang Tang,,

    E-Print Network [OSTI]

    Quantum Junction Solar Cells Jiang Tang,, Huan Liu,, David Zhitomirsky,§ Sjoerd Hoogland,§ Xihua, 1037 Luoyu Road, Wuhan, Hubei 430074, China § Department of Electrical and Computer Engineering-type and p-type materials to create the first quantum junction solar cells. We present a family

  10. Nanowire-based All Oxide Solar Cells

    SciTech Connect (OSTI)

    Yang*, Benjamin D. Yuhas and Peidong; Yang, Peidong

    2008-12-07T23:59:59.000Z

    We present an all-oxide solar cell fabricated from vertically oriented zinc oxide nanowires and cuprous oxide nanoparticles. Our solar cell consists of vertically oriented n-type zinc oxide nanowires, surrounded by a film constructed from p-type cuprous oxide nanoparticles. Our solution-based synthesis of inexpensive and environmentally benign oxide materials in a solar cell would allow for the facile production of large-scale photovoltaic devices. We found that the solar cell performance is enhanced with the addition of an intermediate oxide insulating layer between the nanowires and the nanoparticles. This observation of the important dependence of the shunt resistance on the photovoltaic performance is widely applicable to any nanowire solar cell constructed with the nanowire array in direct contact with one electrode.

  11. Advanced Materials and Nano Technology for Solar Cells

    E-Print Network [OSTI]

    Han, Tao

    2014-01-01T23:59:59.000Z

    price has been reduced by 3/4. 1.2.2 SOLAR CELL CLASSIFICATION Generally, solar cells achieve the Photovoltaic

  12. New Morphological Paradigm Uncovered in Organic Solar Cells

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

    complexity. Improving Solar Cell Models Organic photovoltaics (OPVs), or solar cells, have the potential to provide a low-cost and renewable source of environmentally...

  13. Hybrid Solar Cells via UV Polymerization of Polymer Precursor...

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

    Solar Cells via UV Polymerization of Polymer Precursor Technology available for licensing: A method to create improved hybrid solar cells through the ultraviolet (UV)...

  14. Understanding Collection-Related Losses in Organic Solar Cells...

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

    Understanding Collection-Related Losses in Organic Solar Cells Home > Research > ANSER Research Highlights > Understanding Collection-Related Losses in Organic Solar Cells...

  15. Sandia National Laboratories: dye-sensitized solar cell

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

    dye-sensitized solar cell Combining 'Tinkertoy' Materials with Solar Cells for Increased Photovoltaic Efficiency On December 4, 2014, in Energy, Materials Science, News, News &...

  16. The Design of Organic Polymers and Small Molecules to Improve the Efficiency of Excitonic Solar Cells

    E-Print Network [OSTI]

    Armstrong, Paul Barber

    2010-01-01T23:59:59.000Z

    J. The physics of solar cells; Imperial College Press,for organic polymer solar cells investigated to date. Theincluding organic solar cells and dye-sensitized solar

  17. Core-Shell Nanopillar Array Solar Cells using Cadmium Sulfide Coating on Indium Phosphide Nanopillars

    E-Print Network [OSTI]

    Tu, Bor-An Clayton

    2013-01-01T23:59:59.000Z

    Monocrystalline silicon solar cells, polycrystalline silicon solar cells, and amorphous silicon (thin-film)

  18. Bypass diode for a solar cell

    DOE Patents [OSTI]

    Rim, Seung Bum; Kim, Taeseok; Smith, David D; Cousins, Peter J

    2013-11-12T23:59:59.000Z

    Methods of fabricating bypass diodes for solar cells are described. In once embodiment, a method includes forming a first conductive region of a first conductivity type above a substrate of a solar cell. A second conductive region of a second conductivity type is formed on the first conductive region. In another embodiment, a method includes forming a first conductive region of a first conductivity type above a substrate of a solar cell. A second conductive region of a second conductivity type is formed within, and surrounded by, an uppermost portion of the first conductive region but is not formed in a lowermost portion of the first conductive region.

  19. Heterojunction solar cell with passivated emitter surface

    DOE Patents [OSTI]

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

    1994-05-31T23:59:59.000Z

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

  20. Heterojunction solar cell with passivated emitter surface

    DOE Patents [OSTI]

    Olson, Jerry M. (Lakewood, CO); Kurtz, Sarah R. (Golden, CO)

    1994-01-01T23:59:59.000Z

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

  1. Design, fabrication, and analysis of crystalline Si-SiGe heterostructure thin-film solar cells

    SciTech Connect (OSTI)

    Said, K.; Poortmans, J.; Caymax, M.; Nijs, J.; Debarge, L.; Christoffel, E.; Slaoui, A.

    1999-10-01T23:59:59.000Z

    One possible method to improve the efficiency of crystalline silicon (Ci) solar cells is by alloying with germanium (Ge). Although the improved absorption of the alloy leads to a gain in the current, the reduction of the alloy bandgap causes a loss in voltage, which overrides the increased current of the SiGe alloy solar cell. There has been a number of theoretical studies to circumvent this behavior. However, to date there has been no detailed study, which discusses the technological implementation of these concepts in solar cells. In this paper, the design issues of crystalline Si-SiGe heterostructure will be dealt with in an attempt to reduce the effect of the increased dark current of the alloyed cells, while at the same time sustaining the enhancement in the current. The enhanced back surface field at the back p{sup +}-Si/p-SiGe interface reduces the base component of the recombination current of the heterostructure cell if recombination caused by dislocations is neglected. A higher infrared (IR) response which results in a higher short-circuit current (2 mA/cm{sup 2} higher than a reference Si cell) has been recorded for the Si-Si{sub .9}Ge{sub .1}-thin-film structure of 15 {micro}m thickness. The reduction in dark saturation current, which has been predicted based on the theoretical calculations could not be realized in the heterostructure SiGe/Si cell due to the degradation effect of the misfit dislocations that decreases the bulk lifetime, and increases the interface recombination velocity. In a structure which contains a p{sup +}-SiGe buffer layer, and efficiency of 12.5% is achieved for a SiGe cell with 15 {micro}m thickness without texturing or optical confinement, which is about the same as the Si reference cell with equal active thickness, but with a higher short-circuit current. These results, for the first time, experimentally prove that alloying with Ge offers a higher current and might have a room for improving the efficiency of the multijunction solar cells or dual bandgap cells when SiGe is used to convert the IR-part of the spectrum.

  2. Indium oxide/n-silicon heterojunction solar cells

    DOE Patents [OSTI]

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

    1982-12-28T23:59:59.000Z

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

  3. * Corresponding author. Solar Energy Materials & Solar Cells 58 (1999) 209}218

    E-Print Network [OSTI]

    Romeo, Alessandro

    * Corresponding author. Solar Energy Materials & Solar Cells 58 (1999) 209}218 A highly e$cient and stable CdTe/CdS thin "lm solar cell N. Romeo, A. Bosio, R. Tedeschi*, A. Romeo, V. Canevari Dipartimento$cient and stable CdTe/CdS thin "lm solar cells. Our cells are prepared in three subsequent phases. Firstly, we

  4. Solar Energy Materials & Solar Cells 71 (2002) 261271 Photoelectric behavior of nanocrystalline TiO2

    E-Print Network [OSTI]

    Huang, Yanyi

    . A sandwich-type solar cell fabricated by this dye-sensitized nanocrystalline TiO2 film generated 6:1 mA cmĂ?2; Nanocrystalline TiO2; Dye sensitized solar cell; Terpyridyl ruthenium dyes; Photoelectrochemical solar cells unmatched performance in dye staff studied as solar cell sensitizer before 1997. Only recently, a black dye

  5. Microstructured surface design for omnidirectional antireflection coatings on solar cells

    E-Print Network [OSTI]

    Zhou, Weidong

    Microstructured surface design for omnidirectional antireflection coatings on solar cells Weidong to current crystalline silicon solar cells, as well as future thin film, quantum dot, and organic solar cells for light collection is vital in achieving high performance solar cells.1 An ideal antireflec- tion AR

  6. Rational design of hybrid organic solar cells

    E-Print Network [OSTI]

    Lentz, Levi (Levi Carl)

    2014-01-01T23:59:59.000Z

    In this thesis, we will present a novel design for a nano-structured organic-inorganic hybrid photovoltaic material that will address current challenges in bulk heterojunction (BHJ) organic-based solar cell materials. ...

  7. Colloidal cluster phases and solar cells 

    E-Print Network [OSTI]

    Mailer, Alastair George

    2012-11-28T23:59:59.000Z

    The arrangement of soft materials through solution processing techniques is a topic of profound importance for next generation solar cells; the resulting morphology has a major influence on construction, performance and ...

  8. Texturization of multicrystalline silicon solar cells

    E-Print Network [OSTI]

    Li, Dai-Yin

    2010-01-01T23:59:59.000Z

    A significant efficiency gain for crystalline silicon solar cells can be achieved by surface texturization. This research was directed at developing a low-cost, high-throughput and reliable texturing method that can create ...

  9. Dye-sensitized solar cells

    DOE Patents [OSTI]

    Skotheim, Terje A. [Berkeley, CA

    1980-03-04T23:59:59.000Z

    A low-cost dye-sensitized Schottky barrier solar cell comprised of a substrate of semiconductor with an ohmic contact on one face, a sensitizing dye adsorbed onto the opposite face of the semiconductor, a transparent thin-film layer of a reducing agent over the dye, and a thin-film layer of metal over the reducing agent. The ohmic contact and metal layer constitute electrodes for connection to an external circuit and one or the other or both are made transparent to permit light to penetrate to the dye and be absorbed therein for generating electric current. The semiconductor material chosen to be the substrate is one having a wide bandgap and which therefore is transparent; the dye selected is one having a ground state within the bandgap of the semiconductor to generate carriers in the semiconductor, and a first excited state above the conduction band edge of the semiconductor to readily conduct electrons from the dye to the semiconductor; the reducing agent selected is one having a ground state above the ground state of the sensitizer to provide a plentiful source of electrons to the dye during current generation and thereby enhance the generation; and the metal for the thin-film layer of metal is selected to have a Fermi level in the vicinity of or above the ground state of the reducing agent to thereby amply supply electrons to the reducing agent.

  10. Dye-sensitized solar cells

    DOE Patents [OSTI]

    Skotheim, T.A.

    1980-03-04T23:59:59.000Z

    A low-cost dye-sensitized Schottky barrier solar cell is comprised of a substrate of semiconductor with an ohmic contact on one face, a sensitizing dye adsorbed onto the opposite face of the semiconductor, a transparent thin-film layer of a reducing agent over the dye, and a thin-film layer of metal over the reducing agent. The ohmic contact and metal layer constitute electrodes for connection to an external circuit and one or the other or both are made transparent to permit light to penetrate to the dye and be absorbed therein for generating electric current. The semiconductor material chosen to be the substrate is one having a wide bandgap and which therefore is transparent; the dye selected is one having a ground state within the bandgap of the semiconductor to generate carriers in the semiconductor, and a first excited state above the conduction band edge of the semiconductor to readily conduct electrons from the dye to the semiconductor; the reducing agent selected is one having a ground state above the ground state of the sensitizer to provide a plentiful source of electrons to the dye during current generation and thereby enhance the generation; and the metal for the thin-film layer of metal is selected to have a Fermi level in the vicinity of or above the ground state of the reducing agent to thereby amply supply electrons to the reducing agent. 3 figs.

  11. Limit of light coupling into solar cells

    E-Print Network [OSTI]

    Naqavi, A; Ballif, C; Scharf, T; Herzig, H P

    2013-01-01T23:59:59.000Z

    We introduce a limit for the strength of coupling light into the modes of solar cells. This limit depends on both a cell's thickness and its modal properties. For a cell with refractive index n and thickness d, we obtain a maximal coupling rate of 2c*sqrt(n^2-1)/d where c is speed of light. Our method can be used in the design of solar cells and in calculating their efficiency limits; besides, it can be applied to a broad variety of resonant phenomena and devices.

  12. NANOCOMPOSITE ENABLED SENSITIZED SOLAR CELL

    E-Print Network [OSTI]

    Phuyal, Dibya

    2012-01-01T23:59:59.000Z

    by Dye-Sensitized Photovoltaic cells. Inorganic Chemistry,by Dye-Sensitized Photovoltaic Cells. Inorganic ChemistryThe characteristics of a photovoltaic cell. Generally,

  13. Plastic Schottky-barrier solar cells

    DOE Patents [OSTI]

    Waldrop, J.R.; Cohen, M.J.

    1981-12-30T23:59:59.000Z

    A photovoltaic cell structure is fabricated from an active medium including an undoped polyacetylene, organic semiconductor. When a film of such material is in rectifying contact with a metallic area electrode, a Schottky-barrier junction is obtained within the body of the cell structure. Also, a gold overlayer passivates a magnesium layer on the undoped polyacetylene film. With the proper selection and location of elements a photovoltaic cell structure and solar cell are obtained.

  14. Nanoscale Charge Transport in Excitonic Solar Cells

    SciTech Connect (OSTI)

    Venkat Bommisetty, South Dakota State University

    2011-06-23T23:59:59.000Z

    Excitonic solar cells, including all-organic, hybrid organic-inorganic and dye-sensitized solar cells (DSSCs), offer strong potential for inexpensive and large-area solar energy conversion. Unlike traditional inorganic semiconductor solar cells, where all the charge generation and collection processes are well understood, these excitonic solar cells contain extremely disordered structures with complex interfaces which results in large variations in nanoscale electronic properties and has a strong influence on carrier generation, transport, dissociation and collection. Detailed understanding of these processes is important for fabrication of highly efficient solar cells. Efforts to improve efficiency are underway at a large number of research groups throughout the world focused on inorganic and organic semiconductors, photonics, photophysics, charge transport, nanoscience, ultrafast spectroscopy, photonics, semiconductor processing, device physics, device structures, interface structure etc. Rapid progress in this multidisciplinary area requires strong synergetic efforts among researchers from diverse backgrounds. Such effort can lead to novel methods for development of new materials with improved photon harvesting and interfacial treatments for improved carrier transport, process optimization to yield ordered nanoscale morphologies with well defined electronic structures.

  15. Nanoparticle Solar Cell Final Technical Report

    SciTech Connect (OSTI)

    Breeze, Alison, J; Sahoo, Yudhisthira; Reddy, Damoder; Sholin, Veronica; Carter, Sue

    2008-06-17T23:59:59.000Z

    The purpose of this work was to demonstrate all-inorganic nanoparticle-based solar cells with photovoltaic performance extending into the near-IR region of the solar spectrum as a pathway towards improving power conversion efficiencies. The field of all-inorganic nanoparticle-based solar cells is very new, with only one literature publication in the prior to our project. Very little is understood regarding how these devices function. Inorganic solar cells with IR performance have previously been fabricated using traditional methods such as physical vapor deposition and sputtering, and solution-processed devices utilizing IR-absorbing organic polymers have been investigated. The solution-based deposition of nanoparticles offers the potential of a low-cost manufacturing process combined with the ability to tune the chemical synthesis and material properties to control the device properties. This work, in collaboration with the Sue Carter research group at the University of California, Santa Cruz, has greatly expanded the knowledge base in this field, exploring multiple material systems and several key areas of device physics including temperature, bandgap and electrode device behavior dependence, material morphological behavior, and the role of buffer layers. One publication has been accepted to Solar Energy Materials and Solar Cells pending minor revision and another two papers are being written now. While device performance in the near-IR did not reach the level anticipated at the beginning of this grant, we did observe one of the highest near-IR efficiencies for a nanoparticle-based solar cell device to date. We also identified several key parameters of importance for improving both near-IR performance and nanoparticle solar cells in general, and demonstrated multiple pathways which showed promise for future commercialization with further research.

  16. Investigating the efficiency of Silicon Solar cells at

    E-Print Network [OSTI]

    Attari, Shahzeen Z.

    Investigating the efficiency of Silicon Solar cells at different temperatures and wavelengths to study the characteristics of silicon photovoltaic cells (solar cells). We vary the wavelength of light as well as the temperature of the solar cell to investigate how the open voltage across the cell varies

  17. Solar Energy Materials & Solar Cells 88 (2005) 6573 Investigation of pulsed non-melt laser annealing

    E-Print Network [OSTI]

    Anderson, Timothy J.

    Solar Energy Materials & Solar Cells 88 (2005) 65­73 Investigation of pulsed non-melt laser annealing on the film properties and performance of Cu(In,Ga)Se2 solar cells Xuege Wanga , Sheng S. Lia,�, C time to modify near- surface defects and related junction properties in Cu(In,Ga)Se2 (CIGS) solar cells

  18. Solar Energy Materials & Solar Cells 75 (2003) 307312 Extreme radiation hardness and light-weighted

    E-Print Network [OSTI]

    Woodall, Jerry M.

    Solar Energy Materials & Solar Cells 75 (2003) 307­312 Extreme radiation hardness and light-weighted thin-film indium phosphide solar cell and its computer simulation Guohua Lia, *, Qingfen Yanga+ -i-p+ InP solar cell is developed. The total thickness of its epitaxial layer is only 0.22 mm

  19. Questions I will answer What is a solar cell?

    E-Print Network [OSTI]

    McGehee, Michael

    grid 4 #12;5 #12;Solar panels on the Interna9onal Space Sta9on 6 #12;Area#12;Questions I will answer · What is a solar cell? · How are solar cells are solar cells made? · How do they work? · How efficient can they be? · How

  20. Sandia National Laboratories: high-efficiency solar cells

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

    cells Sandia and EMCORE: Solar Photovoltaics, Fiber Optics, MODE, and Energy Efficiency On March 29, 2013, in Concentrating Solar Power, Energy, Partnership, Photovoltaic,...

  1. Liquid cooled, linear focus solar cell receiver

    DOE Patents [OSTI]

    Kirpich, Aaron S. (Broomall, PA)

    1985-01-01T23:59:59.000Z

    Separate structures for electrical insulation and thermal conduction are established within a liquid cooled, linear focus solar cell receiver for use with parabolic or Fresnel optical concentrators. The receiver includes a V-shaped aluminum extrusion having a pair of outer faces each formed with a channel receiving a string of solar cells in thermal contact with the extrusion. Each cell string is attached to a continuous glass cover secured within the channel with spring clips to isolate the string from the external environment. Repair or replacement of solar cells is effected simply by detaching the spring clips to remove the cover/cell assembly without interrupting circulation of coolant fluid through the receiver. The lower surface of the channel in thermal contact with the cells of the string is anodized to establish a suitable standoff voltage capability between the cells and the extrusion. Primary electrical insulation is provided by a dielectric tape disposed between the coolant tube and extrusion. Adjacent solar cells are soldered to interconnect members designed to accommodate thermal expansion and mismatches. The coolant tube is clamped into the extrusion channel with a releasably attachable clamping strip to facilitate easy removal of the receiver from the coolant circuit.

  2. Method of restoring degraded solar cells

    DOE Patents [OSTI]

    Staebler, D.L.

    1983-02-01T23:59:59.000Z

    Amorphous silicon solar cells have been shown to have efficiencies which degrade as a result of long exposure to light. Annealing such cells in air at a temperature of about 200 C for at least 30 minutes restores their efficiency. 2 figs.

  3. Method of restoring degraded solar cells

    DOE Patents [OSTI]

    Staebler, David L. (Lawrenceville, NJ)

    1983-01-01T23:59:59.000Z

    Amorphous silicon solar cells have been shown to have efficiencies which degrade as a result of long exposure to light. Annealing such cells in air at a temperature of about 200.degree. C. for at least 30 minutes restores their efficiency.

  4. Liquid cooled, linear focus solar cell receiver

    DOE Patents [OSTI]

    Kirpich, A.S.

    1983-12-08T23:59:59.000Z

    Separate structures for electrical insulation and thermal conduction are established within a liquid cooled, linear focus solar cell receiver for use with parabolic or Fresnel optical concentrators. The receiver includes a V-shaped aluminum extrusion having a pair of outer faces each formed with a channel receiving a string of solar cells in thermal contact with the extrusion. Each cell string is attached to a continuous glass cover secured within the channel with spring clips to isolate the string from the external environment. Repair or replacement of solar cells is effected simply by detaching the spring clips to remove the cover/cell assembly without interrupting circulation of coolant fluid through the receiver. The lower surface of the channel in thermal contact with the cells of the string is anodized to establish a suitable standoff voltage capability between the cells and the extrusion. Primary electrical insulation is provided by a dielectric tape disposed between the coolant tube and extrusion. Adjacent solar cells are soldered to interconnect members designed to accommodate thermal expansion and mismatches. The coolant tube is clamped into the extrusion channel with a releasably attachable clamping strip to facilitate easy removal of the receiver from the coolant circuit.

  5. The Kanatzidis - Chang Cell: dye sensitized all solid state solar...

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

    The Kanatzidis - Chang Cell: dye sensitized all solid state solar cell Home > Research > ANSER Research Highlights > The Kanatzidis - Chang Cell: dye sensitized all solid state...

  6. Method of fabricating a solar cell array

    DOE Patents [OSTI]

    Lazzery, Angelo G. (Oaklyn, NJ); Crouthamel, Marvin S. (Pennsauken, NJ); Coyle, Peter J. (Oaklyn, NJ)

    1982-01-01T23:59:59.000Z

    A first set of pre-tabbed solar cells are assembled in a predetermined array with at least part of each tab facing upward, each tab being fixed to a bonding pad on one cell and abutting a bonding pad on an adjacent cell. The cells are held in place with a first vacuum support. The array is then inverted onto a second vacuum support which holds the tabs firmly against the cell pads they abut. The cells are exposed to radiation to melt and reflow the solder pads for bonding the tab portions not already fixed to bonding pads to these pads.

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

    E-Print Network [OSTI]

    Rollins, Andrew M.

    Semitransparent ultrathin CdTe solar cells Semitransparent ultrathin CdTe solar cells lines · Thinfilm CIGS--not available in transparent form · Dye sensitized solar thin films· Dye.E. McCandless, W.A. Buchanan. "High throughput processing of CdTe/CdS solar cells with thin absorber

  8. Core-Shell Nanopillar Array Solar Cells using Cadmium Sulfide Coating on Indium Phosphide Nanopillars

    E-Print Network [OSTI]

    Tu, Bor-An Clayton

    2013-01-01T23:59:59.000Z

    Nanocrystalline dye-sensitized solar cell/copper indium3, pp. M. Grätzel, “Dye-sensitized solar cells,” Journal ofefficiency solar cell based on dye- sensitized colloidal

  9. Air stable all-inorganic nanocrystal solar cells processed from solution

    E-Print Network [OSTI]

    Gur, Ilan; Fromer, Neil A.; Geier, Michael L.; Alivisatos, A. Paul

    2005-01-01T23:59:59.000Z

    Bube, Fundamentals of Solar Cells (Academic Press, New York,of organic based solar cells and distinguish them from theirinorganic nanocrystal solar cells processed from solution

  10. Achieving High Performance Polymer Tandem Solar Cells via Novel Materials Design

    E-Print Network [OSTI]

    Dou, Letian

    2014-01-01T23:59:59.000Z

    polymers for organic solar cell applications. Chem. Rev.Hummelen, J. C. , Plastic solar cells. Adv. Funct. Mater.polymer design for tandem solar cells and achieved certified

  11. Design of Nanostructured Solar Cells Using Coupled Optical and Electrical Modeling

    E-Print Network [OSTI]

    Deceglie, Michael G

    2014-01-01T23:59:59.000Z

    Energy  Materials  and  Solar  Cells   39.   Spinelli,  J. ,   The  physics  of  solar  cells.  Imperial  College  Si   wire   array   solar   cells,   Proceeding   of   the  

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

    E-Print Network [OSTI]

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

    2006-01-01T23:59:59.000Z

    polymer bulk heterojunction solar cells. Journal of PhysicalS. & Meissner, D. Hybrid solar cells based on nanoparticlesmodelling of organic solar cells: The dependence of internal

  13. Catching some rays: Organic solar cells make a leap forward ...

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

    resources Primer on solar power Solar Car Lesson Plan Catching some rays: Organic solar cells make a leap forward By Jared Sagoff * June 13, 2012 Tweet EmailPrint Drawn...

  14. Fabricating solar cells with silicon nanoparticles

    DOE Patents [OSTI]

    Loscutoff, Paul; Molesa, Steve; Kim, Taeseok

    2014-09-02T23:59:59.000Z

    A laser contact process is employed to form contact holes to emitters of a solar cell. Doped silicon nanoparticles are formed over a substrate of the solar cell. The surface of individual or clusters of silicon nanoparticles is coated with a nanoparticle passivation film. Contact holes to emitters of the solar cell are formed by impinging a laser beam on the passivated silicon nanoparticles. For example, the laser contact process may be a laser ablation process. In that case, the emitters may be formed by diffusing dopants from the silicon nanoparticles prior to forming the contact holes to the emitters. As another example, the laser contact process may be a laser melting process whereby portions of the silicon nanoparticles are melted to form the emitters and contact holes to the emitters.

  15. Fundamental limit of nanophotonic light trapping in solar cells

    E-Print Network [OSTI]

    Fan, Shanhui

    -generation solar cells. The ultimate success of photovoltaic (PV) cell technology requires great advancementsFundamental limit of nanophotonic light trapping in solar cells Zongfu Yu1 , Aaswath Raman and is becoming increasingly urgent for current solar cell research. The standard theory of light trapping

  16. EELE408 Photovoltaics Lecture 16: Silicon Solar Cell Fabrication Techniques

    E-Print Network [OSTI]

    Kaiser, Todd J.

    ;3 Screen Printed Solar Cells · Firing the contacts ­ The furnace heats the cell to a high temperature by Efficiency 22 Rear Panel before Lamination 23 Buried Contact Solar Cells · High Efficiency · Laser groved1 EELE408 Photovoltaics Lecture 16: Silicon Solar Cell Fabrication Techniques Dr. Todd J. Kaiser

  17. Accounting for Localized Defects in the Optoelectronic Design of Thin-Film Solar Cells

    E-Print Network [OSTI]

    Deceglie, Michael G.

    2014-01-01T23:59:59.000Z

    silicon thin film solar cells," Solar Energy, vol. 77, pp.nano-crystalline silicon n–i–p solar cells," Solar EnergyMaterials and Solar Cells, vol. 93, pp. H. Sakai, T.

  18. Core-Shell Nanopillar Array Solar Cells using Cadmium Sulfide Coating on Indium Phosphide Nanopillars

    E-Print Network [OSTI]

    Tu, Bor-An Clayton

    2013-01-01T23:59:59.000Z

    for the improvement of CdTe solar cells,” Solar EnergySolar Energy Materials and Solar Cells, vol. 93, no. 4, pp.Materials and Solar Cells, vol. 95, no. 3, pp. 816–820, Mar.

  19. Structural Integration of Silicon Solar Cells and Lithium-ion Batteries Using Printed Electronics

    E-Print Network [OSTI]

    Kang, Jin Sung

    2012-01-01T23:59:59.000Z

    Solar Energy Materials and Solar Cells, vol. 93, 2009, pp.Solar energy materials and solar cells, vol. 91, 2007, pp.to integrate thin-film solar cells and batteries (2)

  20. Approaches To Integrating A HIgh Penertration Of Solar PV and CPV Onto The Electrical Grid

    E-Print Network [OSTI]

    Hill, Steven Craig

    2013-01-01T23:59:59.000Z

    of the absorber or photovoltaic cell. Color behavior, oras ln (A.27) For a photovoltaic cell under concentrated2 day Multijunction photovoltaic cells are used with medium

  1. Flexible implementation of rigid solar cell technologies.

    SciTech Connect (OSTI)

    Hollowell, Andrew E.

    2010-08-01T23:59:59.000Z

    As a source of clean, remote energy, photovoltaic (PV) systems are an important area of research. The majority of solar cells are rigid materials with negligible flexibility. Flexible PV systems possess many advantages, such as being transportable and incorporable on diverse structures. Amorphous silicon and organic PV systems are flexible; however, they lack the efficiency and lifetime of rigid cells. There is also a need for PV systems that are light weight, especially in space and flight applications. We propose a solution to this problem by arranging rigid cells onto a flexible substrate creating efficient, light weight, and flexible devices. To date, we have created a working prototype of our design using the 1.1cm x 1cm Emcore cells. We have achieved a better power to weight ratio than commercially available PowerFilm{reg_sign}, which uses thin film silicon yielding .034W/gram. We have also tested our concept with other types of cells and verified that our methods are able to be adapted to any rigid solar cell technology. This allows us to use the highest efficiency devices despite their physical characteristics. Depending on the cell size we use, we can rival the curvature of most available flexible PV devices. We have shown how the benefits of rigid solar cells can be integrated into flexible applications, allowing performance that surpasses alternative technologies.

  2. High throughput solar cell ablation system

    DOE Patents [OSTI]

    Harley, Gabriel; Pass, Thomas; Cousins, Peter John; Viatella, John

    2012-09-11T23:59:59.000Z

    A solar cell is formed using a solar cell ablation system. The ablation system includes a single laser source and several laser scanners. The laser scanners include a master laser scanner, with the rest of the laser scanners being slaved to the master laser scanner. A laser beam from the laser source is split into several laser beams, with the laser beams being scanned onto corresponding wafers using the laser scanners in accordance with one or more patterns. The laser beams may be scanned on the wafers using the same or different power levels of the laser source.

  3. Solar cell contact formation using laser ablation

    DOE Patents [OSTI]

    Harley, Gabriel; Smith, David D.; Cousins, Peter John

    2014-07-22T23:59:59.000Z

    The formation of solar cell contacts using a laser is described. A method of fabricating a back-contact solar cell includes forming a poly-crystalline material layer above a single-crystalline substrate. The method also includes forming a dielectric material stack above the poly-crystalline material layer. The method also includes forming, by laser ablation, a plurality of contacts holes in the dielectric material stack, each of the contact holes exposing a portion of the poly-crystalline materiat layer; and forming conductive contacts in the plurality of contact holes.

  4. High throughput solar cell ablation system

    DOE Patents [OSTI]

    Harley, Gabriel; Pass, Thomas; Cousins, Peter John; Viatella, John

    2014-10-14T23:59:59.000Z

    A solar cell is formed using a solar cell ablation system. The ablation system includes a single laser source and several laser scanners. The laser scanners include a master laser scanner, with the rest of the laser scanners being slaved to the master laser scanner. A laser beam from the laser source is split into several laser beams, with the laser beams being scanned onto corresponding wafers using the laser scanners in accordance with one or more patterns. The laser beams may be scanned on the wafers using the same or different power levels of the laser source.

  5. Solar cell contact formation using laser ablation

    DOE Patents [OSTI]

    Harley, Gabriel; Smith, David; Cousins, Peter

    2012-12-04T23:59:59.000Z

    The formation of solar cell contacts using a laser is described. A method of fabricating a back-contact solar cell includes forming a poly-crystalline material layer above a single-crystalline substrate. The method also includes forming a dielectric material stack above the poly-crystalline material layer. The method also includes forming, by laser ablation, a plurality of contacts holes in the dielectric material stack, each of the contact holes exposing a portion of the poly-crystalline material layer; and forming conductive contacts in the plurality of contact holes.

  6. November 21, 2000 PV Lesson Plan 1 Solar Cells

    E-Print Network [OSTI]

    Oregon, University of

    November 21, 2000 PV Lesson Plan 1 ­ Solar Cells Prepared for the Oregon Million Solar Roofs Coalition By Frank Vignola ­ University of Oregon Solar Radiation Monitoring Lab John Hocken ­ South Eugene High School Gary Grace ­ South Eugene High School In Schools #12;1 Solar Cells Lesson Plan Content

  7. Electrical overstress failure in silicon solar cells

    SciTech Connect (OSTI)

    Pease, R.L.; Barnum, J.R.; van Lint, V.A.J.; Vulliet, W.V.; Wrobel, T.F.

    1982-11-01T23:59:59.000Z

    A solar-cell electrical-overstress-failure model and the results of experimental measurements of threshold pulsed failure currents on four types of silicon solar cells are presented. The transient EMP field surrounding a lightning stroke has been identified as a potential threat to a photovoltaic array, yet failure analysis of solar cells in a pulsed environment had not previously been reported. Failure in the low-resistivity concentrator cells at pulse widths between 1 ..mu..s and 1 ms occurred initially in the junction. Finger damage in the form of silver melting occurs at currents only slightly greater than that required for junction damage. The result of reverse-bias transient-overstress tests on high-resistivity (10 ..cap omega..cm) cells demonstrated that the predominant failure mode was due to edge currents. These flat-plate cells failed at currents of only 4 to 20 A, which is one or two orders of magnitude below the model predictions. It thus appears that high-resistivity flat-plate cells are quite vulnerable to electrical overstress which could be produced by a variety of mechanisms.

  8. Photovoltaic nanocrystal scintillators hybridized on Si solar cells

    E-Print Network [OSTI]

    Demir, Hilmi Volkan

    Photovoltaic nanocrystal scintillators hybridized on Si solar cells for enhanced conversion@bilkent.edu.tr Abstract: We propose and demonstrate semiconductor nanocrystal based photovoltaic scintillators integrated on solar cells to enhance photovoltaic device parameters including spectral responsivity, open circuit

  9. Solar cell efficiency enhancement via light trapping in printable resonant

    E-Print Network [OSTI]

    Atwater, Harry

    Solar cell efficiency enhancement via light trapping in printable resonant dielectric nanosphere´de´rale de Lausanne (EPFL), Institute of Microengineering (IMT), Photovoltaics and Thin Film Electronics, photovoltaics, resonant dielectric structures, solar cells * Corresponding author: e-mail jgrandid

  10. Minding the Gap Makes for More Efficient Solar Cells

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

    Minding the Gap Makes for More Efficient Solar Cells Minding the Gap Makes for More Efficient Solar Cells Print Thursday, 19 December 2013 11:01 Using novel materials to develop...

  11. High temperature investigations of crystalline silicon solar cell materials

    E-Print Network [OSTI]

    Hudelson, George David Stephen, III

    2009-01-01T23:59:59.000Z

    Crystalline silicon solar cells are a promising candidate to provide a sustainable, clean energy source for the future. In order to bring about widespread adoption of solar cells, much work is needed to reduce their cost. ...

  12. Investigation of the Role of Trap States in Solar Cell Reliability using Photothermal Deflection Spectroscopy

    E-Print Network [OSTI]

    Bezryadina, Anna Sergeyevna

    2012-01-01T23:59:59.000Z

    dye-sensitized solar cells, solar inks using conventionalof degradation of solar cells, since a material structure,higher effect on the solar cell’s stability and performance.

  13. Method of fabricating a solar cell

    DOE Patents [OSTI]

    Pass, Thomas; Rogers, Robert

    2014-02-25T23:59:59.000Z

    Methods of fabricating solar cells are described. A porous layer may be formed on a surface of a substrate, the porous layer including a plurality of particles and a plurality of voids. A solution may be dispensed into one or more regions of the porous layer to provide a patterned composite layer. The substrate may then be heated.

  14. Metal electrode for amorphous silicon solar cells

    DOE Patents [OSTI]

    Williams, Richard (Princeton, NJ)

    1983-01-01T23:59:59.000Z

    An amorphous silicon solar cell having an N-type region wherein the contact to the N-type region is composed of a material having a work function of about 3.7 electron volts or less. Suitable materials include strontium, barium and magnesium and rare earth metals such as gadolinium and yttrium.

  15. Plastic Schottky barrier solar cells

    DOE Patents [OSTI]

    Waldrop, James R. (Thousand Oaks, CA); Cohen, Marshall J. (Thousand Oaks, CA)

    1984-01-24T23:59:59.000Z

    A photovoltaic cell structure is fabricated from an active medium including an undoped, intrinsically p-type organic semiconductor comprising polyacetylene. When a film of such material is in rectifying contact with a magnesium electrode, a Schottky-barrier junction is obtained within the body of the cell structure. Also, a gold overlayer passivates the magnesium layer on the undoped polyacetylene film.

  16. Assessing Possibilities & Limits for Solar Cells

    E-Print Network [OSTI]

    Nayak, Pabitra K; Cahen, David

    2011-01-01T23:59:59.000Z

    What are the solar cell efficiencies that we can strive towards? We show here that several simple criteria, based on cell and module performance data, serve to evaluate and compare all types of today's solar cells. Analyzing these data allows to gauge in how far significant progress can be expected for the various cell types and, most importantly from both the science and technology points of view, if basic bounds, beyond those known today, may exist, that can limit such progress. This is important, because half a century after Shockley and Queisser (SQ) presented limits, based on detailed balance calculations for single absorber solar cells, those are still held to be the only ones, we need to consider; most efforts to go beyond SQ are directed towards attempts to circumvent them, primarily via smart optics, or optoelectronics. After formulating the criteria and analyzing known loss mechanisms, use of such criteria suggests - additional limits for newer types of cells, Organic and Dye-Sensitized ones, and th...

  17. High-Efficiency Amorphous Silicon Alloy Based Solar Cells and Modules; Final Technical Progress Report, 30 May 2002--31 May 2005

    SciTech Connect (OSTI)

    Guha, S.; Yang, J.

    2005-10-01T23:59:59.000Z

    The principal objective of this R&D program is to expand, enhance, and accelerate knowledge and capabilities for development of high-efficiency hydrogenated amorphous silicon (a-Si:H) and amorphous silicon-germanium alloy (a-SiGe:H) related thin-film multijunction solar cells and modules with low manufacturing cost and high reliability. Our strategy has been to use the spectrum-splitting triple-junction structure, a-Si:H/a-SiGe:H/a-SiGe:H, to improve solar cell and module efficiency, stability, and throughput of production. The methodology used to achieve the objectives included: (1) explore the highest stable efficiency using the triple-junction structure deposited using RF glow discharge at a low rate, (2) fabricate the devices at a high deposition rate for high throughput and low cost, and (3) develop an optimized recipe using the R&D batch large-area reactor to help the design and optimization of the roll-to-roll production machines. For short-term goals, we have worked on the improvement of a-Si:H and a-SiGe:H alloy solar cells. a-Si:H and a-SiGe:H are the foundation of current a-Si:H based thin-film photovoltaic technology. Any improvement in cell efficiency, throughput, and cost reduction will immediately improve operation efficiency of our manufacturing plant, allowing us to further expand our production capacity.

  18. Solar Cells in 2009 and Beyond Mike McGehee

    E-Print Network [OSTI]

    McGehee, Michael

    ;Inorganic Thin Film Solar Cells CdTe CIGS (CuInGaSe2) amorphous Si · A thin film of semiconductorSolar Cells in 2009 and Beyond Mike McGehee Materials Science and Engineering These slides parity cost depends on location #12;Conventional p-n junction photovoltaic (solar) cell #12;Efficiency

  19. Flexible thermal cycle test equipment for concentrator solar cells

    DOE Patents [OSTI]

    Hebert, Peter H. (Glendale, CA); Brandt, Randolph J. (Palmdale, CA)

    2012-06-19T23:59:59.000Z

    A system and method for performing thermal stress testing of photovoltaic solar cells is presented. The system and method allows rapid testing of photovoltaic solar cells under controllable thermal conditions. The system and method presents a means of rapidly applying thermal stresses to one or more photovoltaic solar cells in a consistent and repeatable manner.

  20. 50% EFFICIENT SOLAR CELL ARCHITECTURES AND DESIGNS Allen Barnett1

    E-Print Network [OSTI]

    Honsberg, Christiana

    paths to low cost. Our central innovation is to co-design the optical, interconnect and solar cell cost drivers through novel solar cell architectures and optical elements. LOW CONCENTRATION50% EFFICIENT SOLAR CELL ARCHITECTURES AND DESIGNS Allen Barnett1 , Christiana Honsberg1 , Douglas

  1. MILESTONES TOWARD 50% EFFICIENT SOLAR CELL MODULES Allen Barnett1

    E-Print Network [OSTI]

    Honsberg, Christiana

    and a new silicon solar cell for the mid-energy photons, all while circumventing existing cost driversMILESTONES TOWARD 50% EFFICIENT SOLAR CELL MODULES Allen Barnett1 , Douglas Kirkpatrick2 LightSpin Technologies ABSTRACT: The Very High Efficiency Solar Cell (VHESC) program is developing

  2. A plasmonically enhanced polymer solar cell with goldsilica coreshell nanorods

    E-Print Network [OSTI]

    Xiong, Qihua

    to conventional silicon solar cells due to the low-cost materi- als, mechanical flexibility and solutionA plasmonically enhanced polymer solar cell with gold­silica core­shell nanorods Xiaoyan Xu: Polymer solar cells Au nanorods Metallic nanoparticles Plasmonic effects a b s t r a c t We report the use

  3. Hybrid Silicon Nanocone-Polymer Solar Cells Sangmoo Jeong,

    E-Print Network [OSTI]

    Cui, Yi

    ABSTRACT: Recently, hybrid Si/organic solar cells have been studied for low-cost Si photovoltaic devices solar cell. Additionally, about 26% of the module cost comes from the fabrication processes of a SiHybrid Silicon Nanocone-Polymer Solar Cells Sangmoo Jeong, Erik C. Garnett, Shuang Wang, Zongfu Yu

  4. Simulations of solar cell absorption enhancement using resonant modes

    E-Print Network [OSTI]

    Grandidier, Jonathan

    Simulations of solar cell absorption enhancement using resonant modes of a nanosphere array Jonathan Grandidier Michael G. Deceglie Dennis M. Callahan Harry A. Atwater #12;Simulations of solar cell for enhancing the absorption of thin-film amorphous silicon solar cells using periodic arrangements of resonant

  5. MORPHOLOGY DEPENDENT SHORT CIRCUIT CURRENT IN BULK HETEROJUNCTION SOLAR CELL

    E-Print Network [OSTI]

    Alam, Muhammad A.

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

  6. EELE408 Photovoltaics Lecture 13: Solar Cell Design I

    E-Print Network [OSTI]

    Kaiser, Todd J.

    1 EELE408 Photovoltaics Lecture 13: Solar Cell Design I Dr. Todd J. Kaiser tjkaiser@ece.montana.edu Department of Electrical and Computer Engineering Montana State University - Bozeman Solar Cell Design · Specify the parameters of solar cell structure in order to maximize efficiency given a set of constraints

  7. EELE408 Photovoltaics Lecture 10 Solar Cell Operation

    E-Print Network [OSTI]

    Kaiser, Todd J.

    1 EELE408 Photovoltaics Lecture 10 Solar Cell Operation Dr. Todd J. Kaiser tjkaiser@ece.montana.edu Department of Electrical and Computer Engineering Montana State University - Bozeman P-N Junction Solar CellVbi Charge Density Electrostatic Potential Vbi Solar Cell Operation n Emitter p Base Rear Contact

  8. ZnO Nanotube Based Dye-Sensitized Solar Cells

    E-Print Network [OSTI]

    ZnO Nanotube Based Dye-Sensitized Solar Cells Alex B. F. Martinson,, Jeffrey W. Elam, Joseph T templated by anodic aluminum oxide for use in dye-sensitized solar cells (DSSCs). Atomic layer deposition of the best dye- sensitized solar cells (DSSCs) is the product of a dye with moderate extinction

  9. Plasmonic Nanostructure Design for Efficient Light Coupling into Solar Cells

    E-Print Network [OSTI]

    Atwater, Harry

    Plasmonic Nanostructure Design for Efficient Light Coupling into Solar Cells Vivian E. Ferry, Luke sunlight into guided modes in thin film Si and GaAs plasmonic solar cells whose back interface is coated. These findings show promise for the design of ultrathin solar cells that exhibit enhanced absorption

  10. Dielectric nanostructures for broadband light trapping in organic solar cells

    E-Print Network [OSTI]

    Fan, Shanhui

    Dielectric nanostructures for broadband light trapping in organic solar cells Aaswath Raman, Zongfu@stanford.edu Abstract: Organic bulk heterojunction solar cells are a promising candidate for low-cost next lying on top of the organic solar cell stack produce a 8-15% increase in photocurrent for a model

  11. Nanopillar Photovoltaics: Photon Management and Junction Engineering for Next-Generation Solar Cells

    E-Print Network [OSTI]

    Mariani, Giacomo

    2013-01-01T23:59:59.000Z

    plasmon-enhanced dye- sensitized solar cells through metalnanostructure- based or dye-sensitized solar cells represent

  12. Method of fabricating a solar cell with a tunnel dielectric layer

    DOE Patents [OSTI]

    Dennis, Tim; Harrington, Scott; Manning, Jane; Smith, David; Waldhauer, Ann

    2012-12-18T23:59:59.000Z

    Methods of fabricating solar cells with tunnel dielectric layers are described. Solar cells with tunnel dielectric layers are also described.

  13. Method of fabricating a solar cell with a tunnel dielectric layer

    DOE Patents [OSTI]

    Dennis, Tim; Harrington, Scott; Manning, Jane; Smith, David D; Waldhauer, Ann

    2014-04-29T23:59:59.000Z

    Methods of fabricating solar cells with tunnel dielectric layers are described. Solar cells with tunnel dielectric layers are also described.

  14. Solar Cell Simulation | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOriginEducationVideo »UsageSecretary ofSmallConfidential,2 Solar Background Document 2Solar Cell

  15. Deng & Schiff, Amorphous Silicon Based Solar Cells rev. 7/30/2002, Page 1 Amorphous Silicon Based Solar Cells

    E-Print Network [OSTI]

    Deng, Xunming

    Deng & Schiff, Amorphous Silicon Based Solar Cells rev. 7/30/2002, Page 1 Amorphous Silicon Based Solar Cells Xunming Deng and Eric A. Schiff Table of Contents 1 Overview 3 1.1 Amorphous Silicon: The First Bipolar Amorphous Semiconductor 3 1.2 Designs for Amorphous Silicon Solar Cells: A Guided Tour 6

  16. Highly efficient light management for perovskite solar cells

    E-Print Network [OSTI]

    Wang, Dong-Lin; Hou, Guo-Jiao; Zhu, Zhen-Gang; Yan, Qing-Bo; Su, Gang

    2015-01-01T23:59:59.000Z

    Organic-inorganic halide perovskite solar cells have enormous potential to impact the existing photovoltaic industry. As realizing a higher conversion efficiency of the solar cell is still the most crucial task, a great number of schemes were proposed to minimize the carrier loss by optimizing the electrical properties of the perovskite solar cells. Here, we focus on another significant aspect that is to minimize the light loss by optimizing the light management to gain a high efficiency for perovskite solar cells. In our scheme, the slotted and inverted prism structured SiO2 layers are adopted to trap more light into the solar cells, and a better transparent conducting oxide layer is employed to reduce the parasitic absorption. For such an implementation, the efficiency and the serviceable angle of the perovskite solar cell can be promoted impressively. This proposal would shed new light on developing the high-performance perovskite solar cells.

  17. ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C. Honsberg Solar Cell Operation

    E-Print Network [OSTI]

    Honsberg, Christiana

    is lost as heat. energy Eg 2 31 Absorption process #12;ELEG620: Solar Electric Systems UniversityELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C. Honsberg Solar Cell and shunt resistance). #12;ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2008 C

  18. Modeling and control of thin film surface morphology: application to thin film solar cells

    E-Print Network [OSTI]

    Huang, Jianqiao

    2012-01-01T23:59:59.000Z

    Solar Energy Materials and Solar Cells, 86:207–216, 2005. [silicon thin films and solar cells. Journal of Appliedof a p-i-n thin-film solar cell with front transparent con-

  19. Compensated amorphous-silicon solar cell

    DOE Patents [OSTI]

    Devaud, G.

    1982-06-21T23:59:59.000Z

    An amorphous silicon solar cell including an electrically conductive substrate, a layer of glow discharge deposited hydrogenated amorphous silicon having regions of differing conductivity with at least one region of intrinsic hydrogenated amorphous silicon. The layer of hydrogenated amorphous silicon has opposed first and second major surfaces where the first major surface contacts the elecrically conductive substrate and an electrode for electrically contacting the second major surface. The intrinsic hydrogenated amorphous silicon region is deposited in a glow discharge with an atmosphere which includes not less than about 0.02 atom percent mono-atomic boron. An improved N.I.P. solar cell is disclosed using a BF/sub 3/ doped intrinsic layer.

  20. Green Solar In 2009 researchers at Berkeley helped shift research into new solar cell materials by

    E-Print Network [OSTI]

    Iglesia, Enrique

    ­2077). Given the proposed scales of PV adoption, the health and environmental impacts of PV technology shouldGreen Solar In 2009 researchers at Berkeley helped shift research into new solar cell materials also be considered. This project would examine the proposed solar cell materials and designs and create

  1. US polycrystalline thin film solar cells program

    SciTech Connect (OSTI)

    Ullal, H.S.; Zweibel, K.; Mitchell, R.L. (Solar Energy Research Inst., Golden, CO (USA)) [Solar Energy Research Inst., Golden, CO (USA)

    1989-11-01T23:59:59.000Z

    The Polycrystalline Thin Film Solar Cells Program, part of the United States National Photovoltaic Program, performs R D on copper indium diselenide and cadmium telluride thin films. The objective of the Program is to support research to develop cells and modules that meet the US Department of Energy's long-term goals by achieving high efficiencies (15%-20%), low-cost ($50/m{sup 2}), and long-time reliability (30 years). The importance of work in this area is due to the fact that the polycrystalline thin-film CuInSe{sub 2} and CdTe solar cells and modules have made rapid advances. They have become the leading thin films for PV in terms of efficiency and stability. The US Department of Energy has increased its funding through an initiative through the Solar Energy Research Institute in CuInSe{sub 2} and CdTe with subcontracts to start in Spring 1990. 23 refs., 5 figs.

  2. Solar Energy Materials & Solar Cells 71 (2002) 511522 In situ Raman spectroscopy of the

    E-Print Network [OSTI]

    Nabben, Reinhard

    Solar Energy Materials & Solar Cells 71 (2002) 511­522 In situ Raman spectroscopy. In this situation, a low energy excitation (e.g. visible light) is needed to excite an electron to a neighboring

  3. Optimized Designs and Materials for Nanostructure Based Solar Cells

    E-Print Network [OSTI]

    Shao, Qinghui

    2009-01-01T23:59:59.000Z

    efficiency of solar panels and power to weight ratio insolar cells, there exist two basic processes to convert sunlight power topower to a load connected when charged by Sun. The typical output voltage of a silicon based solar

  4. Evaluation of concentration solar cells for terrestrial applications

    E-Print Network [OSTI]

    An, Tao, M. Eng. Massachusetts Institute of Technology

    2008-01-01T23:59:59.000Z

    Solar energy has become a hot prospect for the future replacement of fossil fuels, which have limited reserves and cause environmental problems. Solar cell is such a device to directly generate electricity from this clean ...

  5. OPVs and Solar Cells: The Basics | University of Texas Energy...

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

    OPVs AND SOLAR CELLS: THE BASICS Harvesting solar energy is a key endeavor for this century as we face ever-decreasing fossil fuel world reserves and ever-increasing environmental...

  6. ORNL researchers make strides toward a copper oxide solar cell...

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

    researchers make strides toward a copper oxide solar cell (hi-res image) Amit Goyal and his team of research scientists are using copper oxide to redesign the face of solar power....

  7. Solar module having reflector between cells

    DOE Patents [OSTI]

    Kardauskas, Michael J. (Billerica, MA)

    1999-01-01T23:59:59.000Z

    A photovoltaic module comprising an array of electrically interconnected photovoltaic cells disposed in a planar and mutually spaced relationship between a light-transparent front cover member in sheet form and a back sheet structure is provided with a novel light-reflecting means disposed between adjacent cells for reflecting light falling in the areas between cells back toward said transparent cover member for further internal reflection onto the solar cells. The light-reflecting comprises a flexible plastic film that has been embossed so as to have a plurality of small V-shaped grooves in its front surface, and a thin light-reflecting coating on said front surface, the portions of said coating along the sides of said grooves forming light-reflecting facets, said grooves being formed so that said facets will reflect light impinging thereon back into said transparent cover sheet with an angle of incidence greater than the critical angle, whereby substantially all of the reflected light will be internally reflected from said cover sheet back to said solar modules, thereby increasing the current output of the module.

  8. TRANSPARENT COATINGS FOR SOLAR CELLS RESEARCH

    SciTech Connect (OSTI)

    Glatkowski, P.J.; Landis, D.A.

    2013-04-16T23:59:59.000Z

    Todays solar cells are fabricated using metal oxide based transparent conductive coatings (TCC) or metal wires with optoelectronic performance exceeding that currently possible with Carbon Nanotube (CNT) based TCCs. The motivation for replacing current TCC is their inherent brittleness, high deposition cost, and high deposition temperatures; leading to reduced performance on thin substrates. With improved processing, application and characterization techniques Nanofiber and/or CNT based TCCs can overcome these shortcomings while offering the ability to be applied in atmospheric conditions using low cost coating processes At todays level of development, CNT based TCC are nearing commercial use in touch screens, some types of information displays (i.e. electronic paper), and certain military applications. However, the resistivity and transparency requirements for use in current commercial solar cells are more stringent than in many of these applications. Therefore, significant research on fundamental nanotube composition, dispersion and deposition are required to reach the required performance commanded by photovoltaic devices. The objective of this project was to research and develop transparent conductive coatings based on novel nanomaterial composite coatings, which comprise nanotubes, nanofibers, and other nanostructured materials along with binder materials. One objective was to show that these new nanomaterials perform at an electrical resistivity and optical transparency suitable for use in solar cells and other energy-related applications. A second objective was to generate new structures and chemistries with improved resistivity and transparency performance. The materials also included the binders and surface treatments that facilitate the utility of the electrically conductive portion of these composites in solar photovoltaic devices. Performance enhancement venues included: CNT purification and metallic tube separation techniques, chemical doping, CNT patterning and alignment, advances in commercial and research materials and field effect schemes. In addition, Eikos continued to develop improved efficiency coating materials and transfer methods suitable for batch and continuous roll-to-roll fabrication requirements. Finally, Eikos collaborated with NREL and the PV-community at large in fabricating and characterizing Invisicon���® enabled solar cells.

  9. Valuing the Time-Varying Electricity Production of Solar Photovoltaic Cells

    E-Print Network [OSTI]

    Borenstein, Severin

    2005-01-01T23:59:59.000Z

    Production of Solar Photovoltaic Cells Severin BorensteinProduction of Solar Photovoltaic Cells Severin Borenstein 1concerns is so- lar photovoltaic cells (PVs), which capture

  10. Photonic Design: From Fundamental Solar Cell Physics to Computational Inverse Design

    E-Print Network [OSTI]

    Miller, Owen Dennis

    2012-01-01T23:59:59.000Z

    Surface Textures for Sub-Wavelength Solar Cells 7.1 Problemhigh-efficiency III-V cells,” Solar Cells, vol. 30, pp. 337–Limit 4 Analysis of next-generation solar cells 4.1 Carrier

  11. Investigation of the Role of Trap States in Solar Cell Reliability using Photothermal Deflection Spectroscopy

    E-Print Network [OSTI]

    Bezryadina, Anna Sergeyevna

    2012-01-01T23:59:59.000Z

    of degradation of solar cells, since a material structure,higher effect on the solar cell’s stability and performance.en.wikipedia.org/wiki/Solar_cell_efficiency, accessed 10) J.

  12. Solare Cell Roof Tile And Method Of Forming Same

    DOE Patents [OSTI]

    Hanoka, Jack I. (Brookline, MA); Real, Markus (Oberberg, CH)

    1999-11-16T23:59:59.000Z

    A solar cell roof tile includes a front support layer, a transparent encapsulant layer, a plurality of interconnected solar cells and a backskin layer. The front support layer is formed of light transmitting material and has first and second surfaces. The transparent encapsulant layer is disposed adjacent the second surface of the front support layer. The interconnected solar cells has a first surface disposed adjacent the transparent encapsulant layer. The backskin layer has a first surface disposed adjacent a second surface of the interconnected solar cells, wherein a portion of the backskin layer wraps around and contacts the first surface of the front support layer to form the border region. A portion of the border region has an extended width. The solar cell roof tile may have stand-offs disposed on the extended width border region for providing vertical spacing with respect to an adjacent solar cell roof tile.

  13. Solar Cells DOI: 10.1002/ange.201203330

    E-Print Network [OSTI]

    Hone, James

    of Science, Office of Basic Energy Sciences under award number DE-SC0001085) and the FENA (Grant 2009-NTSolar Cells DOI: 10.1002/ange.201203330 A Supramolecular Complex in Small-Molecule Solar Cells solution can create the active layer in solar cells. We found that there is self-organization between

  14. Solar Cell Nanotechnology Final Technical Report

    SciTech Connect (OSTI)

    Das, Biswajit [University of Nevada, Las Vegas

    2014-05-07T23:59:59.000Z

    The objective of this project is to develop a low cost nonlithographic nanofabrication technology for the fabrication of thin film porous templates as well as uniform arrays of semiconductor nanostructures for the implementation of high efficiency solar cells. Solar cells based on semiconductor nanostructures are expected to have very high energy conversion efficiencies due to the increased absorption coefficients of semiconductor nanostructures. In addition, the thin film porous template can be used for optimum surface texturing of solar cells leading to additional enhancement in energy conversion efficiency. An important requirement for these applications is the ability to synthesize nanostructure arrays of different dimensions with good size control. This project employed nanoporous alumina templates created by the anodization of aluminum thin films deposited on glass substrates for the fabrication of the nanostructures and optimized the process parameters to obtain uniform pore diameters. An additional requirement is uniformity or regularity of the nanostructure arrays. While constant current anodization was observed to provide controlled pore diameters, constant voltage anodization was needed for regularity of the nanostructure arrays. Thus a two-step anodization process was investigated and developed in this project for improving the pore size distribution and pore periodicity of the nanoporous alumina templates. CdTe was selected to be the active material for the nanowires, and the process for the successful synthesis of CdTe nanowires was developed in this project. Two different synthesis approaches were investigated in this project, electrochemical and electrophoretic deposition. While electrochemical synthesis was successfully employed for the synthesis of nanowires inside the pores of the alumina templates, the technique was determined to be non-optimum due to the need of elevated temperature that is detrimental to the structural integrity of the nanoporous alumina templates. In order to eliminate this problem, electrophoretic deposition was selected as the more appropriate technique, which involves the guided deposition of semiconductor nanoparticles in the presence of ultrasonic energy to form the crystalline nanowires. Extensive experimental research was carried out to optimize the process parameters for formation of crystalline nanowires. It was observed that the environmental bath temperature plays a critical role in determining the structural integrity of the nanowires and hence their lengths. Investigation was carried out for the formation of semitransparent ohmic contacts on the nanowires to facilitate photocurrent spectroscopy measurements as well as for solar cell implementation. Formation of such ohmic contacts was found to be challenging and a process involving mechanical and electrochemical polishing was developed to facilitate such contacts. The use of nanoporous alumina templates for the surface texturing of mono- and multi-crystalline solar cells was extensively investigated by electrochemical etching of the silicon through the pores of the nanoporous templates. The processes for template formation as well as etching were optimized and the alumina/silicon interface was investigated using capacitance-voltage characterization. The process developed was found to be viable for improving solar cell performance.

  15. Simple Method Quantifies Recombination Pathways in Solar Cells (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2013-09-01T23:59:59.000Z

    NREL's analytic equation uses open-circuit voltage data to determine how much recombination occurs via different channels in a solar cell.

  16. Sandia National Laboratories: control key solar cell material...

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

    with metal-organic framework (MOF) materials by combining them with dye-sensitized solar cells (DSSCs). ... Last Updated: December 4, 2014 Go To Top Exceptional service...

  17. Sandia National Laboratories: control key solar cell interfaces

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

    with metal-organic framework (MOF) materials by combining them with dye-sensitized solar cells (DSSCs). ... Last Updated: December 4, 2014 Go To Top Exceptional service...

  18. Controlled Structure of Organic-Nanomaterial Solar Cells - Energy...

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

    Controlled Structure of Organic-Nanomaterial Solar Cells Lawrence Berkeley National Laboratory Contact LBL About This Technology Technology Marketing SummaryOrganic, polymer-based...

  19. amorphous solar cell: Topics by E-print Network

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

    The convergence Schiff, Eric A. 20 Fully Solution-Processed Copper Chalcopyrite Thin Film Solar Cells: Materials Chemistry, Processing, and Device Physics University of...

  20. arsenide solar cells: Topics by E-print Network

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

    Pankaj J Edla; Dr. Bhupendra Gupta 92 Fully Solution-Processed Copper Chalcopyrite Thin Film Solar Cells: Materials Chemistry, Processing, and Device Physics University of...

  1. alingap solar cell: Topics by E-print Network

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

    Pankaj J Edla; Dr. Bhupendra Gupta 84 Fully Solution-Processed Copper Chalcopyrite Thin Film Solar Cells: Materials Chemistry, Processing, and Device Physics University of...

  2. automated solar cell: Topics by E-print Network

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

    Pankaj J Edla; Dr. Bhupendra Gupta 103 Fully Solution-Processed Copper Chalcopyrite Thin Film Solar Cells: Materials Chemistry, Processing, and Device Physics University of...

  3. arsenide solar cell: Topics by E-print Network

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

    Pankaj J Edla; Dr. Bhupendra Gupta 92 Fully Solution-Processed Copper Chalcopyrite Thin Film Solar Cells: Materials Chemistry, Processing, and Device Physics University of...

  4. alloy solar cells: Topics by E-print Network

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

    Pankaj J Edla; Dr. Bhupendra Gupta 91 Fully Solution-Processed Copper Chalcopyrite Thin Film Solar Cells: Materials Chemistry, Processing, and Device Physics University of...

  5. Method of fabricating bifacial tandem solar cells

    DOE Patents [OSTI]

    Wojtczuk, Steven J; Chiu, Philip T; Zhang, Xuebing; Gagnon, Edward; Timmons, Michael

    2014-10-07T23:59:59.000Z

    A method of fabricating on a semiconductor substrate bifacial tandem solar cells with semiconductor subcells having a lower bandgap than the substrate bandgap on one side of the substrate and with subcells having a higher bandgap than the substrate on the other including, first, growing a lower bandgap subcell on one substrate side that uses only the same periodic table group V material in the dislocation-reducing grading layers and bottom subcells as is present in the substrate and after the initial growth is complete and then flipping the substrate and growing the higher bandgap subcells on the opposite substrate side which can be of different group V material.

  6. Solar Energy Materials & Solar Cells 77 (2003) 319330 Structure and photoelectrochemical properties

    E-Print Network [OSTI]

    Huang, Yanyi

    Solar Energy Materials & Solar Cells 77 (2003) 319­330 Letters Structure and photoelectrochemical a promis- ing strategy for solar energy conversion, with energy conversion efficiency as high monochromatic photon to current conversion efficiency, overall energy conversion yield (Z) and transient

  7. An Overview of Solar Cell Technology Mike McGehee

    E-Print Network [OSTI]

    McGehee, Michael

    An Overview of Solar Cell Technology Mike McGehee Materials Science and Engineering Global ClimateWatt and Evergreen Solar went bankrupt Jon Stewart, The Daily Show Solyndra, SpectraWatt and Evergreen Solar went provide 20 % of that. It takes a panel rated at 5 W, to average 1 W of power through the day and year, sog

  8. Efficiency limits of quantum well solar cells

    E-Print Network [OSTI]

    Connolly, J P; Barnham, K W J; Bushnell, D B; Tibbits, T N D; Roberts, J S

    2010-01-01T23:59:59.000Z

    The quantum well solar cell (QWSC) has been proposed as a flexible means to ensuring current matching for tandem cells. This paper explores the further advantage afforded by the indication that QWSCs operate in the radiative limit because radiative contribution to the dark current is seen to dominate in experimental data at biases corresponding to operation under concentration. The dark currents of QWSCs are analysed in terms of a light and dark current model. The model calculates the spectral response (QE) from field bearing regions and charge neutral layers and from the quantum wells by calculating the confined densities of states and absorption coefficient, and solving transport equations analytically. The total dark current is expressed as the sum of depletion layer and charge neutral radiative and non radiative currents consistent with parameter values extracted from QE fits to data. The depletion layer dark current is a sum of Shockley-Read-Hall non radiative, and radiative contributions. The charge neu...

  9. Reducing the Cost of Solar Cells

    SciTech Connect (OSTI)

    Scanlon, B.

    2012-04-01T23:59:59.000Z

    Solar-powered electricity prices could soon approach those of power from coal or natural gas thanks to collaborative research with solar startup Ampulse Corporation at the National Renewable Energy Laboratory. Silicon wafers account for almost half the cost of today's solar photovoltaic panels, so reducing or eliminating wafer costs is essential to bringing prices down. Current crystalline silicon technology converts energy in a highly efficient manner; however, that technology is manufactured with processes that could stand some improvement. The industry needs a method that is less complex, creates less waste and uses less energy. First, half the refined silicon is lost as dust in the wafer-sawing process, driving module costs higher. Wafers are sawn off of large cylindrical ingots, or boules, of silicon. A typical 2-meter boule loses as many as 6,000 potential wafers during sawing. Second, the wafers produced are much thicker than necessary. To efficiently convert sunlight into electricity, the wafers need be only one-tenth the typical thickness. NREL, the Oak Ridge National Laboratory and Ampulse have partnered on an approach to eliminate this waste and dramatically lower the cost of the finished solar panels. By using a chemical vapor deposition process to grow the silicon on inexpensive foil, Ampulse is able to make the solar cells just thick enough to convert most of the solar energy into electricity. No more sawdust - and no more wasting refined silicon materials. NREL developed the technology to grow high-quality silicon and ORNL developed the metal foil that has the correct crystal structure to support that growth. Ampulse is installing a pilot manufacturing line in NREL's Process Development Integration Laboratory, where solar companies can work closely with lab scientists on integrated equipment to answer pressing questions related to their technology development, as well as rapidly overcoming R and D challenges and risk. NREL's program is focused on transformative innovation in the domestic PV industry. With knowledge and expertise acquired from the PDIL pilot production line tools, Ampulse plans to design a full-scale production line to accommodate long rolls of metal foil. The Ampulse process 'goes straight from pure silicon-containing gas to high-quality crystal silicon film,' said Brent Nelson, the operational manager for the Process Development Integration Laboratory. 'The advantage is you can make the wafer just as thin as you need it - 10 microns or less.' Most of today's solar cells are made out of wafer crystalline silicon, though thin-film cells made of more exotic elements such as copper, indium, gallium, arsenic, cadmium, tellurium and others are making a strong push into the market. The advantage of silicon is its abundance, because it is derived from sand. Silicon's disadvantage is that purifying it into wafers suitable for solar cells can be expensive and energy intensive. Manufacturers add carbon and heat to sand to produce metallurgical-grade silicon, which is useful in other industries, but not yet suitable for making solar cells. So this metallurgical-grade silicon is then converted to pure trichlorosilane (SiCl3) or silane (SiH4) gas. Typically, the purified gas is then converted to create a silicon feedstock at 1,000 degrees Celsius. This feedstock is melted at 1,414 C and recrystallized into crystal ingots that are finally sawed into wafers. The Ampulse method differs in that it eliminates the last two steps in the traditional process and works directly with the silane gas growing only the needed silicon right onto a foil substrate. A team of NREL scientists had developed a way to use a process called hot-wire chemical vapor deposition to thicken silicon wafers with near perfect crystal structure. Using a hot tungsten filament much like the one found in an incandescent light bulb, the silane gas molecules are broken apart and deposited onto the wafer using the chemical vapor deposition technique at about 700 C - a much lower temperature than needed to make the wafer. The hot filament dec

  10. Laser beam apparatus and method for analyzing solar cells

    DOE Patents [OSTI]

    Staebler, David L. (Lawrenceville, NJ)

    1980-01-01T23:59:59.000Z

    A laser beam apparatus and method for analyzing, inter alia, the current versus voltage curve at the point of illumination on a solar cell and the open circuit voltage of a solar cell. The apparatus incorporates a lock-in amplifier, and a laser beam light chopper which permits the measurement of the AC current of the solar cell at an applied DC voltage at the position on the solar cell where the cell is illuminated and a feedback scheme which permits the direct scanning measurements of the open circuit voltage. The accuracy of the measurement is a function of the intensity and wavelength of the laser light with respect to the intensity and wavelength distribution of sunlight and the percentage the dark current is at the open circuit voltage to the short circuit current of the solar cell.

  11. Microbial Fuel Cells -Solar Times http://solar.rain-barrel.net/microbial-fuel-cells/ 1 of 3 6/28/2006 11:32 AM

    E-Print Network [OSTI]

    Lovley, Derek

    Microbial Fuel Cells - Solar Times http://solar.rain-barrel.net/microbial-fuel-cells/ 1 of 3 6/28/2006 11:32 AM Microbial Fuel Cells Posted in Alternative Energy by admin. The other end of solar energy? As the search for fuel cells goes on, many environmentalists give all their attention to solar energy

  12. Core/Shell heterojunction nanowire solar cell fabricated by lithographically patterned nanowire electrodeposition method

    E-Print Network [OSTI]

    Ghosh, Somnath

    2012-01-01T23:59:59.000Z

    width dependent study of Solar Cell parameters Mott-SchotkyCore/Shell NW based solar cells and NIR photodetectors. Thep-n heterojunction NW solar cells and detailed study of the

  13. Fully Solution-Processed Copper Chalcopyrite Thin Film Solar Cells: Materials Chemistry, Processing, and Device Physics

    E-Print Network [OSTI]

    Chung, Choong-Heui

    2012-01-01T23:59:59.000Z

    CuInS x Se 2-x solar cells and its effect on defectabundant Cu 2 ZnSn(S,Se) 4 solar cells”, submitted 5. B. K.Visibly transparent polymer solar cells produced by solution

  14. Lead selenide nanowire solar cells via LPNE and its new found derivatives

    E-Print Network [OSTI]

    Hujdic, Justin

    2012-01-01T23:59:59.000Z

    associated with producing a solar cell and will therefore beabsorber layer in my solar cell, and proceed to chapter 3 ofdevices, including my solar cells, and how I have begun

  15. Panoramic view of electrochemical pseudocapacitor and organic solar cell research in molecularly engineered energy materials (MEEM)

    E-Print Network [OSTI]

    2014-01-01T23:59:59.000Z

    al. The State of Organic Solar Cells?A Meta Analysis. Sol.Efficiency in Polymer Solar Cells. Adv. Funct. Mater. 2009,Bulk- Heterojunction Solar Cells. J. Phys. Chem. C 2011,

  16. Structural Integration of Silicon Solar Cells and Lithium-ion Batteries Using Printed Electronics

    E-Print Network [OSTI]

    Kang, Jin Sung

    2012-01-01T23:59:59.000Z

    better mechanical durability. CIGS solar cell has about 20%5]. However, CIGS solar cells degrade with humidity andSelenide (CIGS)[3] and organic polymer[4] solar cells are

  17. Fully Solution-Processed Copper Chalcopyrite Thin Film Solar Cells: Materials Chemistry, Processing, and Device Physics

    E-Print Network [OSTI]

    Chung, Choong-Heui

    2012-01-01T23:59:59.000Z

    cm 2 ) efficiency CIGS solar cells taken from reference [and 20.3% efficiency CIGS solar cells [6] through the use ofcm 2 ) efficiency CIGS solar cells taken from reference [6].

  18. 1D Modeling of Solar Cells ELEN E9501 Course Project

    E-Print Network [OSTI]

    Lavaei, Javad

    1D Modeling of Solar Cells ELEN E9501 Course Project Columbia University Department of Electrical.............................................................................................................8 4.3 Simulation Results of the Solar Cell Model......................................................................................................13 #12;2 ILLUSTRATIONS Figure 1. IV Characteristic of the solar cell

  19. Nanopillar Photovoltaics: Photon Management and Junction Engineering for Next-Generation Solar Cells

    E-Print Network [OSTI]

    Mariani, Giacomo

    2013-01-01T23:59:59.000Z

    silicon nanowires as solar cells and nanoelectronic powerTowards efficient hybrid solar cells based on fully polymerSariciftci, N. S. Hybrid solar cells, Inorg. Chim. Acta 361,

  20. Kelvin Probe Force Microscopy for in situ Electrical Characterization of Organic Solar Cells

    E-Print Network [OSTI]

    Fisher, Frank

    Kelvin Probe Force Microscopy for in situ Electrical Characterization of Organic Solar Cells., University of Pittsburgh The most efficient organic solar cell today is made from blending conjugated donors and acceptors in bulk heterojunction organic solar cells. Most microscopic characterization

  1. In Situ X-Ray Scattering Helps Optimize Printed Solar Cells

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

    In Situ X-Ray Scattering Helps Optimize Printed Solar Cells In Situ X-Ray Scattering Helps Optimize Printed Solar Cells Print Wednesday, 25 February 2015 00:00 Plastic solar cells...

  2. The Design of Organic Polymers and Small Molecules to Improve the Efficiency of Excitonic Solar Cells

    E-Print Network [OSTI]

    Armstrong, Paul Barber

    2010-01-01T23:59:59.000Z

    J. The physics of solar cells; Imperial College Press,for organic polymer solar cells investigated to date. Thebulk heterojunction organic solar cells, blends of a p-type

  3. Nanopillar Photovoltaics: Photon Management and Junction Engineering for Next-Generation Solar Cells

    E-Print Network [OSTI]

    Mariani, Giacomo

    2013-01-01T23:59:59.000Z

    Towards efficient hybrid solar cells based on fully polymerSariciftci, N. S. Hybrid solar cells, Inorg. Chim. Acta 361,Y. , Warta, W. , Dunlop, E.D. Solar cell efficiency table (

  4. Modeling and control of thin film surface morphology: application to thin film solar cells

    E-Print Network [OSTI]

    Huang, Jianqiao

    2012-01-01T23:59:59.000Z

    of a p-i-n thin-film solar cell with front transparent con-for thin-film a-si:h solar cells. Progress in Photovoltaics,in thin-film silicon solar cells. Optics Communications,

  5. Theory of Current Transients in Planar Semiconductor Devices: Insights and Applications to Organic Solar Cells

    E-Print Network [OSTI]

    Hawks, SA; Finck, BY; Schwartz, BJ

    2015-01-01T23:59:59.000Z

    a polythiophene:fullerene solar cell, Appl. Phys. Lett. 92,polymer: fullerene solar cells made by solution-sequentialmeasurements of P3HT:PCBM solar cells, Adv. Energy Mater. 2,

  6. Thermodynamics, Entropy, Information and the Efficiency of Solar Cells

    E-Print Network [OSTI]

    Abrams, Zeev R.

    2012-01-01T23:59:59.000Z

    CIGS, so the addition of the dc layer would not alter the material choice for a solar cell.solar cell, the use of GaAs has recently become feasible due to scalable manufacturing techniques, and compound materials such as CIGS (

  7. SUPPORTING INFORMATION Si Microwire Solar Cells: Improved Efficiency with a

    E-Print Network [OSTI]

    S1 SUPPORTING INFORMATION Si Microwire Solar Cells: Improved Efficiency with a Conformal SiO2 Layer Technologies, 174 Haverhill Road, Topsfield, MA 01983 School of Engineering and Applied Sciences, Harvard improvements (%) of Si microwire solar cells (6 µµµµm height) after conformal SiO2 coating SiO2 thickness Jsc

  8. Hierarchically structured photoelectrodes for dye-sensitized solar cells

    E-Print Network [OSTI]

    Cao, Guozhong

    Hierarchically structured photoelectrodes for dye-sensitized solar cells Qifeng Zhang and Guozhong or one-dimensional assemblies. Introduction Dye-sensitized solar cells (DSCs) are a category Cao* DOI: 10.1039/c0jm04345a This paper highlights several significant achievements in dye-sensitized

  9. Radial Electron Collection in Dye-Sensitized Solar Cells

    E-Print Network [OSTI]

    Radial Electron Collection in Dye-Sensitized Solar Cells Alex B. F. Martinson,, Jeffrey W. Elam photoelectrode architecture consisting of concentric conducting and semiconducting nanotubes for use in dye-sensitized solar cells (DSSCs). Atomic layer deposition is employed to grow indium tin oxide (ITO) within a porous

  10. CRADA Final Report: Process development for hybrid solar cells

    SciTech Connect (OSTI)

    Ager, Joel W

    2011-02-14T23:59:59.000Z

    TCF funding of a CRADA between LBNL and RSLE leveraged RSLE's original $1M investment in LBNL research and led to development of a solar cell fabrication process that will bring the high efficiency, high voltage hybrid tandem solar cell closer to commercialization. RSLE has already built a pilot line at its Phoenix, Arizona site.

  11. Light Trapping in Solar Cells Using Resonant Nanostructures P. Spinelli

    E-Print Network [OSTI]

    van Rooij, Robert

    and by improving their photovoltaic conversion efficiency. For Si solar cells, both challenges can be achievedLight Trapping in Solar Cells Using Resonant Nanostructures P. Spinelli #12;Summary Photovoltaics of energy for our society. In order for this to happen, photovoltaics needs to be economically competitive

  12. ADOPT-A-CELL PROGRAM Help support the success of the CalSol solar team by

    E-Print Network [OSTI]

    Mofrad, Mohammad R. K.

    . $20: Solar Encapsulation High-tech solar lamination improves solar energy collection and increasesADOPT-A-CELL PROGRAM Help support the success of the CalSol solar team by adopting a small part the durability of solar cells. The money will go towards laminating one single solar cell. $50: Solar Cell Solar

  13. Review paper: Toward highly efficient quantum-dot-and dye-sensitized solar cells

    E-Print Network [OSTI]

    Park, Byungwoo

    Review paper: Toward highly efficient quantum-dot- and dye-sensitized solar cells Hongsik Choi Interface control Light harvesting Tandem solar cell a b s t r a c t Dye- and quantum-dot-sensitized solar technologies of silicon-based solar cells should be resolved [7]. Dye-sensitized solar cells (DSSCs) have been

  14. Amorphous silicon/crystalline silicon heterojunctions: The future of high-efficiency silicon solar cells

    E-Print Network [OSTI]

    Firestone, Jeremy

    ;5 Record efficiencies #12;6 Diffused-junction solar cells Diffused-junction solar cell Chemical passivation to ~650 mV #12;7 Silicon heterojunction solar cells a-Si:H provides excellent passivation of c-Si surface Heterojunction solar cell Chemical passivation Chemical passivation #12;8 Voc and silicon heterojunction solar

  15. Limiting Emission Angle for Improved Solar Cell

    E-Print Network [OSTI]

    cooling, waste heat recovery and solar electricity generation, low values of the thermoelectric figure

  16. III-V High-Efficiency Multijunction Photovoltaics (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2011-06-01T23:59:59.000Z

    Capabilities fact sheet that includes scope, core competencies and capabilities, and contact/web information for III-V High-Efficiency Multijunction Photovoltaics at the National Center for Photovoltaics.

  17. 0.7-eV GaInAs Junction for a GaInP/GaAs/GaInAs(1eV)/GaInAs(0.7eV) Four-Junction Solar Cell

    SciTech Connect (OSTI)

    Friedman, D. J.; Geisz, J. F.; Norman, A. G.; Wanlass, M. W.; Kurtz, S. R.

    2006-01-01T23:59:59.000Z

    We discuss recent developments in III-V multijunction solar cells, focusing on adding a fourth junction to the Ga{sub 0.5}In{sub 0.5} P/GaAs/Ga{sub 0.75}In{sub 0.25}As inverted three-junction cell. This cell, grown inverted on GaAs so that the lattice-mismatched Ga{sub 0.75}In{sub 0.25}As third junction is the last one grown, has demonstrated 38% efficiency, and 40% is likely in the near future. To achieve still further gains, a lower-bandgap Ga{sub x}In{sub 1-x}As fourth junction could be added to the three-junction structure for a four-junction cell whose efficiency could exceed 45% under concentration. Here, we present the initial development of the Ga{sub x}In{sub 1-x}As fourth junction. Junctions of various bandgaps ranging from 0.88 to 0.73 eV were grown, in order to study the effect of the different amounts of lattice mismatch. At a bandgap of 0.88 eV, junctions were obtained with very encouraging {approx}80% quantum efficiency, 57% fill factor, and 0.36 eV open-circuit voltage. The device performance degrades with decreasing bandgap (i.e., increasing lattice mismatch). We model the four-junction device efficiency vs. fourth junction bandgap to show that an 0.7-eV fourth-junction bandgap, while optimal if it could be achieved in practice, is not necessary; an 0.9-eV bandgap would still permit significant gains in multijunction cell efficiency while being easier to achieve than the lower-bandgap junction.

  18. Efficiency of silicon solar cells containing chromium

    DOE Patents [OSTI]

    Frosch, Robert A. Administrator of the National Aeronautics and Space (New Port Beach, CA); Salama, Amal M. (New Port Beach, CA)

    1982-01-01T23:59:59.000Z

    Efficiency of silicon solar cells containing about 10.sup.15 atoms/cm.sup.3 of chromium is improved about 26% by thermal annealing of the silicon wafer at a temperature of 200.degree. C. to form chromium precipitates having a diameter of less than 1 Angstrom. Further improvement in efficiency is achieved by scribing laser lines onto the back surface of the wafer at a spacing of at least 0.5 mm and at a depth of less than 13 micrometers to preferentially precipitate chromium near the back surface and away from the junction region of the device. This provides an economical way to improve the deleterious effects of chromium, one of the impurities present in metallurgical grade silicon material.

  19. Solar cells incorporating light harvesting arrays

    DOE Patents [OSTI]

    Lindsey, Jonathan S. (Raleigh, NC); Meyer, Gerald J. (Baltimore, MD)

    2002-01-01T23:59:59.000Z

    A solar cell incorporates a light harvesting array that comprises: (a) a first substrate comprising a first electrode; and (b) a layer of light harvesting rods electrically coupled to the first electrode, each of the light harvesting rods comprising a polymer of Formula I: X.sup.1.paren open-st.X.sup.m+1).sub.m (I) wherein m is at least 1, and may be from two, three or four to 20 or more; X.sup.1 is a charge separation group (and preferably a porphyrinic macrocycle, which may be one ligand of a double-decker sandwich compound) having an excited-state of energy equal to or lower than that of X.sup.2 ; and X.sup.2 through X.sup.m+1 are chromophores (and again are preferably porphyrinic macrocycles).

  20. Solar cells incorporating light harvesting arrays

    DOE Patents [OSTI]

    Lindsey, Jonathan S.; Meyer, Gerald J.

    2003-07-22T23:59:59.000Z

    A solar cell incorporates a light harvesting array that comprises: (a) a first substrate comprising a first electrode; and (b) a layer of light harvesting rods electrically coupled to the first electrode, each of the light harvesting rods comprising a polymer of Formula I: ##EQU1## wherein m is at least 1, and may be from two, three or four to 20 or more; X.sup.1 is a charge separation group (and preferably a porphyrinic macrocycle, which may be one ligand of a double-decker sandwich compound) having an excited-state of energy equal to or lower than that of X.sup.2 ; and X.sup.2 through X.sup.m+1 are chromophores (and again are preferably porphyrinic macrocycles).

  1. The analysis and optimization of a spherical silicon solar cell

    E-Print Network [OSTI]

    McKee, William Randall

    1976-01-01T23:59:59.000Z

    silicon solar cell has been estimated using a cylindrical solar cell with some modifications as an approximate model. Calculations were made for both the cylindrical model and the conventional planar cell with the aid of a Fortran IV computer program... ln the p nnd n layers, respect lvely (cm I) N(X) monochromatic photon flux incident on the solar cell (cm g sec ~ o ) N 0 number of photons/cm sec with wavelengths shorter than l. lp (cm sec ) n po' no thermal equilibrium concentration...

  2. Effects of cell area on the performance of dye sensitized solar cell

    SciTech Connect (OSTI)

    Khatani, Mehboob, E-mail: mkhatani@hotmail.com, E-mail: noranimuti-mohamed@petronas.com.my, E-mail: hishmid@petronas.com.my, E-mail: azclement@yahoo.com, E-mail: aeska07@gmail.com; Mohamed, Norani Muti, E-mail: mkhatani@hotmail.com, E-mail: noranimuti-mohamed@petronas.com.my, E-mail: hishmid@petronas.com.my, E-mail: azclement@yahoo.com, E-mail: aeska07@gmail.com; Hamid, Nor Hisham, E-mail: mkhatani@hotmail.com, E-mail: noranimuti-mohamed@petronas.com.my, E-mail: hishmid@petronas.com.my, E-mail: azclement@yahoo.com, E-mail: aeska07@gmail.com; Sahmer, Ahmad Zahrin, E-mail: mkhatani@hotmail.com, E-mail: noranimuti-mohamed@petronas.com.my, E-mail: hishmid@petronas.com.my, E-mail: azclement@yahoo.com, E-mail: aeska07@gmail.com; Samsudin, Adel, E-mail: mkhatani@hotmail.com, E-mail: noranimuti-mohamed@petronas.com.my, E-mail: hishmid@petronas.com.my, E-mail: azclement@yahoo.com, E-mail: aeska07@gmail.com [Centre of Innovative Nanostructures and Nanodevices (COINN), UTP (Malaysia)

    2014-10-24T23:59:59.000Z

    Dye sensitized solar cells (DSCs) have significant advantage over the current silicon cells by having low manufacturing cost and potentially high conversion efficiency. Therefore, DSCs are expected to be used as the next generation solar cell device that covers wide range of new applications. In order to achieve highly efficient DSCs for practical application, study on the effect of increasing the cell’s area on the performance of dye sensitized solar need to be carried out. Three different DSC cell areas namely, 1, 12.96 and 93.5 cm{sup 2} respectively were fabricated and analyzed through solar simulator and electrochemical impedance spectroscopy (EIS). From the analysis of electrochemical impedance spectroscopy (EIS), it was observed that the cell’s electron lifetime was influenced significantly by the cell’s area. Although the collection efficiency of all cells recorded to be approximately 100% but higher recombination rate with increased cell area reduced the performance of the cell.

  3. Solar Energy Materials & Solar Cells 58 (1999) 199}208 The behaviour of Na implanted into Mo thin "lms

    E-Print Network [OSTI]

    Rockett, Angus

    Solar Energy Materials & Solar Cells 58 (1999) 199}208 The behaviour of Na implanted into Mo thin, As ngstro( m Solar Center, P.O. Box 534, SE-751 21 Uppsala, Sweden Department of Materials Science Mo thin "lms used as back contacts for Cu(In,Ga)Se solar cells. The samples were analysed

  4. Neural Network Modeling of Degradation of Solar Cells

    SciTech Connect (OSTI)

    Gupta, Himanshu; Ghosh, Bahniman [Department of Electrical Engineering, Indian Institute of Technology, Kanpur, 208016 (India); Banerjee, Sanjay K. [Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX, 78758 (United States)

    2011-05-25T23:59:59.000Z

    Neural network modeling has been used to predict the degradation in conversion efficiency of solar cells in this work. The model takes intensity of light, temperature and exposure time as inputs and predicts the conversion efficiency of the solar cell. Backpropagation algorithm has been used to train the network. It is found that the neural network model satisfactorily predicts the degradation in efficiency of the solar cell with exposure time. The error in the computed results, after comparison with experimental results, lies in the range of 0.005-0.01, which is quite low.

  5. Presented at the 2nd International Meeting on Electrochromism, IME2, (San Diego, CA, October, 1996), to be published in Solar Energy Materials and Solar Cells. LBNL #39633

    E-Print Network [OSTI]

    ), to be published in Solar Energy Materials and Solar Cells. LBNL #39633 ANALYSIS OF DURABILITY IN LITHIUM NICKEL

  6. Solar Energy Materials & Solar Cells 91 (2007) 17261732 Optical and structural properties of Ta2O5CeO2 thin films

    E-Print Network [OSTI]

    Thirumalai, Devarajan

    Solar Energy Materials & Solar Cells 91 (2007) 1726­1732 Optical and structural properties of Ta2O5

  7. The Shockley-Queisser limit for nanostructured solar cells

    E-Print Network [OSTI]

    Xu, Yunlu; Munday, Jeremy N

    2014-01-01T23:59:59.000Z

    The Shockley-Queisser limit describes the maximum solar energy conversion efficiency achievable for a particular material and is the standard by which new photovoltaic technologies are compared. This limit is based on the principle of detailed balance, which equates the photon flux into a device to the particle flux (photons or electrons) out of that device. Nanostructured solar cells represent a new class of photovoltaic devices, and questions have been raised about whether or not they can exceed the Shockley-Queisser limit. Here we show that single-junction nanostructured solar cells have a theoretical maximum efficiency of 42% under AM 1.5 solar illumination. While this exceeds the efficiency of a non- concentrating planar device, it does not exceed the Shockley-Queisser limit for a planar device with optical concentration. We conclude that nanostructured solar cells offer an important route towards higher efficiency photovoltaic devices through a built-in optical concentration.

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

    DOE Patents [OSTI]

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

    1984-03-13T23:59:59.000Z

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

  9. Experiment Based Teaching of Solar Cell Operation and Characterization Using the SolarLab Platform

    E-Print Network [OSTI]

    Sera, Dezso

    of Energy Technology, Aalborg University. Keywords: characterization, experiment based, modelling, solar (MSc and PhD level) taught at the Department of Energy Technology, Aalborg University. SOLAR CELL S. V. Spataru, D. Sera, T. Kerekes, R. Teodorescu Department of Energy Technology Aalborg University

  10. 24th European Photovoltaic Solar Energy Conference, Hamburg, Germany, Sept. 2009 THE BURIED EMITTER SOLAR CELL CONCEPT

    E-Print Network [OSTI]

    area buried emitter solar cell structure circumvents the problem that at present there are no cost EMITTER SOLAR CELL CONCEPT: INTERDIGITATED BACK-JUNCTION STRUCUTRE WITH VIRTUALLY 100% EMITTER COVERAGE back contacted solar cell combines large area emitter allocation with effective insulation of emitter

  11. Infrared modulation spectroscopy of interfaces in amorphous silicon solar cells

    E-Print Network [OSTI]

    Schiff, Eric A.

    Infrared modulation spectroscopy of interfaces in amorphous silicon solar cells Kai Zhu a,1 , E Solar, Toano, VA 23168, USA Abstract We report infrared depletion modulation spectra for near an infrared modulation spectroscopy technique that probes the optical spectra of dopants and defects

  12. Strongly Correlated Electron Systems Functionalized for Solar Cells and Memristors

    E-Print Network [OSTI]

    " #12;Grand Energy Challenge Gap between production and demand: ~14TW by 2050 Install one 1GW new power Demand total industrial developing US ee/fsu Energy source World Capacity Solar Geothermal Biomass Hydro Optimization of gap: max efficiency: 31% (Shockley Queisser 1961) In real PV cells 80-85% of incident solar

  13. Investigation of the Role of Trap States in Solar Cell Reliability using Photothermal Deflection Spectroscopy

    E-Print Network [OSTI]

    Bezryadina, Anna Sergeyevna

    2012-01-01T23:59:59.000Z

    solar cell lead to a higher fill factor, therefore resulting in greater efficiency value, and bringing the cell's output power

  14. Synchrotron-based investigations of the nature and impact of iron contamination in multicrystalline silicon solar cell materials

    E-Print Network [OSTI]

    2004-01-01T23:59:59.000Z

    Solar Energy Materials & Solar Cells 72, 441 (2002). O. F.discussions about solar cells and defects in cast mc-Si;on Crystalline Silicon Solar Cell Materials and Processes (

  15. 1. INTRODUCTION Polycrystalline CdTe thin films solar cells have shown long

    E-Print Network [OSTI]

    Romeo, Alessandro

    for the solar cell, therefore high specific power (ratio of out- put power to the weight) solar cells]. The high specific power is an important issue for space solar cells: if satellites are lighter1. INTRODUCTION Polycrystalline CdTe thin films solar cells have shown long term stable performance

  16. DISSERTATION THE EFFECT OF TRAPPING DEFECTS ON CIGS SOLAR-CELL

    E-Print Network [OSTI]

    Sites, James R.

    DISSERTATION THE EFFECT OF TRAPPING DEFECTS ON CIGS SOLAR-CELL PERFORMANCE Submitted by Pamela K ENTITLED THE EFFECT OF TRAPPING DEFECTS ON CIGS SOLAR-CELL PERFORMANCE BE ACCEPTED AS FULFILLING IN PART RE OF DISSERTATION THE EFFECT OF TRAPPING DEFECTS ON CIGS SOLAR-CELL PERFORMANCE The relationship between basic solar-cell

  17. Ultrathin, high-efficiency, broad-band, omni-acceptance, organic solar cells enhanced by

    E-Print Network [OSTI]

    Ultrathin, high-efficiency, broad-band, omni- acceptance, organic solar cells enhanced by plasmonic: Three of central challenges in solar cells are high light coupling into solar cell, high light trapping and demonstration of a new ultra-thin high- efficiency organic solar cell (SC), termed "plasmonic cavity

  18. NREL Makes Substantial Progress in Developing CZTSe Solar Cells (Fact Sheet) (Revised)

    SciTech Connect (OSTI)

    Not Available

    2011-11-01T23:59:59.000Z

    By defining the deposition process, NREL has significantly improved the conversion efficiency of CZTSe solar cells.

  19. Laser processing of nanocrystalline TiO2 films for dye-sensitized solar cells

    E-Print Network [OSTI]

    Arnold, Craig B.

    Laser processing of nanocrystalline TiO2 films for dye-sensitized solar cells H. Kim,a) G. P­20 m thick) layers incorporated in dye-sensitized solar cells. Laser direct-write is a laser techniques to produce porous nc- TiO2 films required for dye-sensitized solar cells. The dye solar cells

  20. Planar Waveguide-Nanowire Integrated Three-Dimensional Dye-Sensitized Solar Cells

    E-Print Network [OSTI]

    Wang, Zhong L.

    Planar Waveguide-Nanowire Integrated Three-Dimensional Dye-Sensitized Solar Cells Yaguang Wei, Chen to fabricate three-dimensional (3D) dye-sensitized solar cells (DSSCs) by integrating planar optical waveguide cells that can be expanded to organic- and inorganic-based solar cells. KEYWORDS Dye-sensitized solar

  1. Increased light harvesting in dye-sensitized solar cells with energy relay dyes

    E-Print Network [OSTI]

    McGehee, Michael

    Increased light harvesting in dye-sensitized solar cells with energy relay dyes Brian E. Hardin1 factors. However, dye-sensitized solar cells do not completely absorb all of the photons from the visible pathway to develop more efficient dye-sensitized solar cells. D ye-sensitized solar cells (DSCs) work

  2. The construction of tandem dye-sensitized solar cells from chemically-derived nanoporous photoelectrodes

    E-Print Network [OSTI]

    Park, Byungwoo

    The construction of tandem dye-sensitized solar cells from chemically-derived nanoporous Available online 24 October 2014 Keywords: Tandem solar cell Selective etching Dye-sensitized solar cell Nanoporous electrode a b s t r a c t A tandem dye-sensitized solar cell (tandem-DSSC) was synthesized

  3. Rational design of hybrid dye-sensitized solar cells composed of double-layered photoanodes with

    E-Print Network [OSTI]

    Lin, Zhiqun

    Rational design of hybrid dye-sensitized solar cells composed of double-layered photoanodes,a Bailiang Xue,b Wei Liu,c Zhiqun Lina and Yulin Deng*bc A uniquely structured dye-sensitized solar cell tandem solar cells, leading to higher power conversion efficiency. Dye-sensitized solar cells (DSSCs

  4. Enhanced Photovoltaic Performance of Nanostructured Hybrid Solar Cell Using Highly Oriented TiO2 Nanotubes

    E-Print Network [OSTI]

    Cao, Guozhong

    -called third generation of solar cells including dye-sensitized solar cells, DSCs2,3 and organic phoEnhanced Photovoltaic Performance of Nanostructured Hybrid Solar Cell Using Highly Oriented TiO2 nanotubes can be effectively controlled for the suitable use for a hybrid solar cell by varying the diameter

  5. Organic solar cells: An overview focusing on active layer morphology Travis L. Benanti & D. Venkataraman*

    E-Print Network [OSTI]

    Venkataraman, Dhandapani "DV"

    Review Organic solar cells: An overview focusing on active layer morphology Travis L. Benanti & D/acceptor blend, morphology, photovoltaic devices, plastic solar cells, thin films Abstract Solar cells heterojunction concept. This review provides an overview of organic solar cells. Topics covered include: a brief

  6. Microstructured anti-reflection surface design for the omni-directional solar cells

    E-Print Network [OSTI]

    Zhou, Weidong

    Microstructured anti-reflection surface design for the omni-directional solar cells Li Chen for the formation of hemispherical structures as an omni-directional anti-reflection (omni-AR) coating in solar cell current in such hemispherical solar cells hence enhanced to 1.5 times of bulk silicon solar cells

  7. DISSERTATION DEVICE PHYSICS OF Cu(In,Ga)Se2 THIN-FILM SOLAR CELLS

    E-Print Network [OSTI]

    Sites, James R.

    DISSERTATION DEVICE PHYSICS OF Cu(In,Ga)Se2 THIN-FILM SOLAR CELLS Submitted by Markus Gloeckler PHYSICS OF Cu(In,Ga)Se2 THIN-FILM SOLAR CELLS BE ACCEPTED AS FULFILLING IN PART REQUIREMENTS OF Cu(In,Ga)Se2 THIN-FILM SOLAR CELLS Thin-film solar cells have the potential to be an important

  8. DISSERTATION Investigation of Spatial Variations in Collection Efficiency of Solar Cells

    E-Print Network [OSTI]

    Sites, James R.

    DISSERTATION Investigation of Spatial Variations in Collection Efficiency of Solar Cells Submitted BY JASON F. HILTNER ENTITLED INVESTIGATION OF SPATIAL VARIATIONS IN COLLECTION EFFICIENCY OF SOLAR CELLS OF SOLAR CELLS In an effort to investigate spatial variations in solar cells, an apparatus which is capable

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

    E-Print Network [OSTI]

    Sites, James R.

    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-FILM SOLAR CELLS The CdTe thin-film solar cell has a large absorption coefficient and high theoretical

  10. innovati nNREL Designs Promising New Oxides for Solar Cells

    E-Print Network [OSTI]

    innovati nNREL Designs Promising New Oxides for Solar Cells High-efficiency, thin-film solar cells material. The upper TCO contact in a solar cell allows light to reach the absorber material below, which by the TCO to an external circuit, forming the negative terminal of the solar cell. TCOs used in this fashion

  11. Design and fabrication of photonic crystals in epitaxial free silicon for ultrathin solar cells

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Design and fabrication of photonic crystals in epitaxial free silicon for ultrathin solar cells photovoltaic solar cell. Optical simulations performed on a complete solar cell revealed that patterning to obtain ultrathin patterned solar cells. Keywords: Photonic crystals; Epitaxial crystalline silicon; Thin

  12. RANDOM DEPOSITION MODEL OF CDS LAYER IN CDS/CDTE THINFILM SOLAR CELLS

    E-Print Network [OSTI]

    Sites, James R.

    THESIS RANDOM DEPOSITION MODEL OF CDS LAYER IN CDS/CDTE THIN­FILM SOLAR CELLS Submitted by Lei Chen LAYER IN CDS/CDTE THIN­FILM SOLAR CELLS BE AC- CEPTED AS FULFILLING IN PART REQUIREMENTS FOR THE DEGREE MODEL OF CDS LAYER IN CDS/CDTE THIN­FILM SOLAR CELLS Thin­film solar cells are developing dramatically

  13. X-ray absorption spectroscopy of biomimetic dye molecules for solar cells Peter L. Cook,1

    E-Print Network [OSTI]

    Himpsel, Franz J.

    X-ray absorption spectroscopy of biomimetic dye molecules for solar cells Peter L. Cook,1 Xiaosong November 2009 Dye-sensitized solar cells are potentially inexpensive alternatives to traditional semiconductor solar cells. In order to optimize dyes for solar cells we systematically investigate

  14. Polymer Solar Cells: New Materials, 3D Morphology, and Tandem...

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

    Polymer Solar Cells: New Materials, 3D Morphology, and Tandem Devices March 2, 2010 at 3pm36-428 Ren Janssen Molecular Materials and Nanosystems, Eindhoven University of...

  15. New functional polymers for sensors, smart materials and solar cells

    E-Print Network [OSTI]

    Lobez Comeras, Jose Miguel

    2012-01-01T23:59:59.000Z

    Organic polymers can be used as the active component of sensors, smart materials, chemical-delivery systems and the active layer of solar cells. The rational design and modification of the chemical structure of polymers ...

  16. Nanostructured architectures for colloidal quantum dot solar cells

    E-Print Network [OSTI]

    Jean, Joel, S.M. Massachusetts Institute of Technology

    2013-01-01T23:59:59.000Z

    This thesis introduces a novel ordered bulk heterojunction architecture for colloidal quantum dot (QD) solar cells. Quantum dots are solution-processed nanocrystals whose tunable bandgap energies make them a promising ...

  17. Simulation of iron impurity gettering in crystalline silicon solar cells

    E-Print Network [OSTI]

    Powell, Douglas M. (Douglas Michael)

    2012-01-01T23:59:59.000Z

    This work discusses the Impurity-to-Efficiency (12E) simulation tool and applet. The 12E simulator models the physics of iron impurity gettering in silicon solar cells during high temperature processing. The tool also ...

  18. Thermodynamics, Entropy, Information and the Efficiency of Solar Cells

    E-Print Network [OSTI]

    Abrams, Zeev R.

    2012-01-01T23:59:59.000Z

    IR Infra-Red I sc Short-circuit current I-V Current vs.contributes to the short-circuit current of the solar cell.term. Since the short-circuit current is directly

  19. The renaissance of hybrid solar cells: progresses, challenges, and perspectives

    E-Print Network [OSTI]

    Feng, Gao; Ren, Shenqiang; Jianpu, Wang

    2013-06-12T23:59:59.000Z

    Solution-processed hybrid solar cells, a blend of conjugated polymers and semiconducting nanocrystals, are a promising candidate for next-generation energy-conversion devices. The renaissance of this field in recent years has yielded a much deeper...

  20. Light trapping limits in plasmonic solar cells: an analytical investigation

    E-Print Network [OSTI]

    Sheng, Xing

    We analytically investigate the light trapping performance in plasmonic solar cells with Si/metallic structures. We consider absorption enhancements for surface plasmon polaritons (SPPs) at planar Si/metal interfaces and ...

  1. Enhanced light absorption of solar cells and photodetectors by diffraction

    DOE Patents [OSTI]

    Zaidi, Saleem H.; Gee, James M.

    2005-02-22T23:59:59.000Z

    Enhanced light absorption of solar cells and photodetectors by diffraction is described. Triangular, rectangular, and blazed subwavelength periodic structures are shown to improve performance of solar cells. Surface reflection can be tailored for either broadband, or narrow-band spectral absorption. Enhanced absorption is achieved by efficient optical coupling into obliquely propagating transmitted diffraction orders. Subwavelength one-dimensional structures are designed for polarization-dependent, wavelength-selective absorption in solar cells and photodetectors, while two-dimensional structures are designed for polarization-independent, wavelength-selective absorption therein. Suitable one and two-dimensional subwavelength periodic structures can also be designed for broadband spectral absorption in solar cells and photodetectors. If reactive ion etching (RIE) processes are used to form the grating, RIE-induced surface damage in subwavelength structures can be repaired by forming junctions using ion implantation methods. RIE-induced surface damage can also be removed by post RIE wet-chemical etching treatments.

  2. Efficient light trapping structure in thin film silicon solar cells

    E-Print Network [OSTI]

    Sheng, Xing

    Thin film silicon solar cells are believed to be promising candidates for continuing cost reduction in photovoltaic panels because silicon usage could be greatly reduced. Since silicon is an indirect bandgap semiconductor, ...

  3. June 2009 UWMREPORT 15 solar cells turn Bolton roof

    E-Print Network [OSTI]

    Saldin, Dilano

    of the grid, renew- able generation and energy storage to determine how solar cells can support the grid, it will be the largest urban wind turbine in Wisconsin. There currently is one at the MATC campus in Mequon. T Assistant

  4. The analysis and optimization of a spherical silicon solar cell 

    E-Print Network [OSTI]

    McKee, William Randall

    1976-01-01T23:59:59.000Z

    the minority carriers. This differential equation must be solved for the appropriate geometry and boundary conditions to find the distribu- tion of photon generated carriers in the solar cell. Knowing this, the current density at any point in a given... by solving eq. (3) subject to boundary conditions (5) and (6). Knowing the distribution of the photon generated carriers, we can find the current ? voltage charac- teristics and the theoretical efficiency of the solar cell. However, before solving...

  5. Recent technological advances in thin film solar cells

    SciTech Connect (OSTI)

    Ullal, H.S.; Zwelbel, K.; Surek, T.

    1990-03-01T23:59:59.000Z

    High-efficiency, low-cost thin film solar cells are an exciting photovoltaic technology option for generating cost-effective electricity in 1995 and beyond. This paper reviews the substantial advances made by several thin film solar cell technologies, namely, amorphous silicon, copper indium diselenide, cadmium telluride, and polycrystalline silicon. Recent examples of utility demonstration projects of these emerging materials are also discussed. 8 refs., 4 figs.

  6. Nanoantennas for enhanced light trapping in transparent organic solar cells

    E-Print Network [OSTI]

    Voroshilov, Pavel M; Belov, Pavel A

    2014-01-01T23:59:59.000Z

    We propose a light-trapping structure offering a significant enhancement of photovoltaic absorption in transparent organic solar cells operating at infrared while the visible light transmission keeps sufficiently high. The main mechanism of light trapping is related with the excitation of collective oscillations of the metal nanoantenna arrays, characterized by advantageous field distribution in the volume of the solar cell. It allows more than triple increase of infrared photovoltaic absorption.

  7. Thermodynamics of photon-enhanced thermionic emission solar cells

    SciTech Connect (OSTI)

    Reck, Kasper, E-mail: kasper.reck@nanotech.dtu.dk [Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech Building 345E, Kgs. Lyngby 2800 (Denmark); Hansen, Ole, E-mail: ole.hansen@nanotech.dtu.dk [Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech Building 345E, Kgs. Lyngby 2800 (Denmark); CINF Center for Individual Nanoparticle Functionality, Technical University of Denmark, Kgs. Lyngby 2800 (Denmark)

    2014-01-13T23:59:59.000Z

    Photon-enhanced thermionic emission (PETE) cells in which direct photon energy as well as thermal energy can be harvested have recently been suggested as a new candidate for high efficiency solar cells. Here, we present an analytic thermodynamical model for evaluation of the efficiency of PETE solar cells including an analysis of the entropy production due to thermionic emission of general validity. The model is applied to find the maximum efficiency of a PETE cell for given cathode and anode work functions and temperatures.

  8. Mode Splitting for Efficient Plasmoinc Thin-film Solar Cell

    E-Print Network [OSTI]

    Li, Tong; Jiang, Chun

    2010-01-01T23:59:59.000Z

    We propose an efficient plasmonic structure consisting of metal strips and thin-film silicon for solar energy absorption. We numerically demonstrate the absorption enhancement in symmetrical structure based on the mode coupling between the localized plasmonic mode in Ag strip pair and the excited waveguide mode in silicon slab. Then we explore the method of symmetry-breaking to excite the dark modes that can further enhance the absorption ability. We compare our structure with bare thin-film Si solar cell, and results show that the integrated quantum efficiency is improved by nearly 90% in such thin geometry. It is a promising way for the solar cell.

  9. Fabrication and Characterization of Organic Solar Cells

    E-Print Network [OSTI]

    Yengel, Emre

    2010-01-01T23:59:59.000Z

    processable polymer photovoltaic cells by self?organization Photodiodes,  and  Photovoltaic  Cells.   Applied Physics F,  Heeger  AJ.   Polymer  Photovoltaic  Cells  ?  Enhanced 

  10. Fabrication and Characterization of Organic Solar Cells

    E-Print Network [OSTI]

    Yengel, Emre

    2010-01-01T23:59:59.000Z

    AJ. Polymer Photovoltaic Cells - Enhanced Efficiencies Via afor high-efficiency polymer photovoltaic cells usingfactors. The photovoltaic power conversion efficiency (?) [

  11. California: TetraCell Silicon Solar Cell Improves Efficiency...

    Energy Savers [EERE]

    at the SunShot Grand Challenge Summit in Denver, Colorado. | Photo by John De La Rosa. Solar Companies Go for the Gold with SunShot Incubator The Story of a Cutting-Edge Solar...

  12. Planar micro-optic solar concentration

    E-Print Network [OSTI]

    Karp, Jason Harris

    2010-01-01T23:59:59.000Z

    The photovoltaic measured 51.26% efficiency, confirming theSignificant efficiency increases in photovoltaic powerefficiency scaling of performance ratio for multijunction cells," in 2009 34th IEEE Photovoltaic

  13. The mission of the UC Davis Solar Collaborative is simple: to find ways to make solar cells more efficient. Even in theory, the efficiency of conventional solar cells is limited to a disappointing 31%. However, this limit is based

    E-Print Network [OSTI]

    Mission The mission of the UC Davis Solar Collaborative is simple: to find ways to make solar cells more efficient. Even in theory, the efficiency of conventional solar cells is limited to a disappointing 31%. However, this limit is based on the traditional operation of solar cells, where an incoming

  14. Formation of Porous Layers by Electrochemical Etching of Germanium and Gallium Arsenide for Cleave Engineered Layer Transfer (CELT) Application in High Efficiency Multi-Junction Solar Cells

    E-Print Network [OSTI]

    Fong, David Michael

    2012-01-01T23:59:59.000Z

    photovoltaic devices with a world record efficiency ofhigh efficiencies as compared to traditional photovoltaic

  15. Formation of Porous Layers by Electrochemical Etching of Germanium and Gallium Arsenide for Cleave Engineered Layer Transfer (CELT) Application in High Efficiency Multi-Junction Solar Cells

    E-Print Network [OSTI]

    Fong, David Michael

    2012-01-01T23:59:59.000Z

    matched materials of Ge/GaInAs/InGaP commonly used in triplesee that Ge, GaInAs, and InGaP all have a similar latticeinitial substrate to grow an InGaP top layer followed by a

  16. Development of an electronic device quality aluminum antimonide (AlSb) semiconductor for solar cell applications

    DOE Patents [OSTI]

    Sherohman, John W; Yee, Jick Hong; Combs, III, Arthur W

    2014-11-11T23:59:59.000Z

    Electronic device quality Aluminum Antimonide (AlSb)-based single crystals produced by controlled atmospheric annealing are utilized in various configurations for solar cell applications. Like that of a GaAs-based solar cell devices, the AlSb-based solar cell devices as disclosed herein provides direct conversion of solar energy to electrical power.

  17. Identification, Characterization, and Implications of Shadow Degradation in Thin Film Solar Cells

    E-Print Network [OSTI]

    Alam, Muhammad A.

    cells [4]. The problem of shadowing of solar panels has been studied for quite some time; however of a solar cell, showing the dark and light current components. (b) The series connection in a solar panelIdentification, Characterization, and Implications of Shadow Degradation in Thin Film Solar Cells

  18. Modeling of dual-metal Schottky contacts based silicon micro and nano wire solar cells

    E-Print Network [OSTI]

    Anantaram, M. P.

    Modeling of dual-metal Schottky contacts based silicon micro and nano wire solar cells M. Golam Work function Lifetime Diffusion length Interdigitated solar cell a b s t r a c t We study solar cell nanowires and nanotubes are considered to be potential candidates for low cost and high efficiency solar

  19. NREL scientists develop near-field optical microscopy techniques for imaging solar cell junctions and identify

    E-Print Network [OSTI]

    Solar cell producers are facing urgent pressures to lower module production cost.This achievementNREL scientists develop near-field optical microscopy techniques for imaging solar cell junctions is an increasingly important issue for silicon solar cells. The issue has taken center stage now that the solar

  20. Plasmonic Enhancement of Dye-Sensitized Solar Cells Using Core-Shell-Shell Nanostructures

    E-Print Network [OSTI]

    Plasmonic Enhancement of Dye-Sensitized Solar Cells Using Core- Shell-Shell Nanostructures Stafford and demonstrate near-field plasmonic enhancement of dye-sensitized solar cells (DSSCs) incorporating them being researched, dye-sensitized solar cells (DSSCs) are a promising alternative to traditional solar

  1. Dye-Sensitized Solar Cells DOI: 10.1002/anie.201300070

    E-Print Network [OSTI]

    Dye-Sensitized Solar Cells DOI: 10.1002/anie.201300070 Stable Dye-Sensitized Solar Cell,* and Udo Bach* Dye-sensitized solar cells (DSCs) can be fabricated from low- cost components with simple fields, including renewable energy research focusing on DSCs and solar-driven hydrogen generation from

  2. Electronic structure of QD arrays: Application to intermediate-band solar cells

    E-Print Network [OSTI]

    )Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK Abstract-Intermediate band solar cells (IBSC) have the thermodynamic efficiency limits of solar energy conversion. While tandem solar cells can the- oretically exceedNUSOD 2007 Electronic structure of QD arrays: Application to intermediate-band solar cells S

  3. Lead selenide nanowire solar cells via LPNE and its new found derivatives

    E-Print Network [OSTI]

    Hujdic, Justin

    2012-01-01T23:59:59.000Z

    Abstract of the Dissertation Lead selenide nanowire solarOF CALIFORNIA, MERCED Lead selenide nanowire solar cells viatrapping…………………………………………………………16 2. Lead Selenide Nanowires

  4. Enabling Thin Silicon Solar Cell Technology

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

    effort to shift U.S. energy reliance from fossil fuels to renewable sources has spurred companies to reduce the cost and increase the reliability of their solar photovoltaics...

  5. Method Of Making Solar Collectors By In-Situ Encapsulation Of Solar Cells

    DOE Patents [OSTI]

    Carrie, Peter J. (Toronto, CA); Chen, Kingsley D. D. (Markham, CA)

    2000-10-24T23:59:59.000Z

    A method of making solar collectors by encapsulating photovoltaic cells within a base of an elongated solar collector wherein heat and pressure are applied to the cells in-situ, after an encapsulating material has been applied. A tool is fashioned having a bladder expandable under gas pressure, filling a region of the collector where the cells are mounted. At the same time, negative pressure is applied outside of the bladder, enhancing its expansion. The bladder presses against a platen which contacts the encapsulated cells, causing outgassing of the encapsulant, while heat cures the encapsulant. After curing, the bladder is deflated and the tool may be removed from the collector and base and reflective panels put into place, if not already there, thereby allowing the solar collector to be ready for use.

  6. Thin film solar cell configuration and fabrication method

    DOE Patents [OSTI]

    Menezes, Shalini

    2009-07-14T23:59:59.000Z

    A new photovoltaic device configuration based on an n-copper indium selenide absorber and a p-type window is disclosed. A fabrication method to produce this device on flexible or rigid substrates is described that reduces the number of cell components, avoids hazardous materials, simplifies the process steps and hence the costs for high volume solar cell manufacturing.

  7. IMPLEMENTATION OF PLANARIZING LAYERS IN TANDEM SOLAR CELLS Hamed Achour

    E-Print Network [OSTI]

    Candea, George

    °C H2 and CO2 Plasma treatment of deposited films Characterization: Transmittance, FTIR, SEM properties were found to be dependent on temperature. Good top cell surface planarization was observed temperature for application as an intermediate reflector (ZIR) in micromorph solar cells The ZIR layer should

  8. Laminated photovoltaic modules using back-contact solar cells

    DOE Patents [OSTI]

    Gee, James M. (Albuquerque, NM); Garrett, Stephen E. (Albuquerque, NM); Morgan, William P. (Albuquerque, NM); Worobey, Walter (Albuquerque, NM)

    1999-09-14T23:59:59.000Z

    Photovoltaic modules which comprise back-contact solar cells, such as back-contact crystalline silicon solar cells, positioned atop electrically conductive circuit elements affixed to a planar support so that a circuit capable of generating electric power is created. The modules are encapsulated using encapsulant materials such as EVA which are commonly used in photovoltaic module manufacture. The module designs allow multiple cells to be electrically connected in a single encapsulation step rather than by sequential soldering which characterizes the currently used commercial practices.

  9. Three dimensional amorphous silicon/microcrystalline silicon solar cells

    DOE Patents [OSTI]

    Kaschmitter, J.L.

    1996-07-23T23:59:59.000Z

    Three dimensional deep contact amorphous silicon/microcrystalline silicon (a-Si/{micro}c-Si) solar cells are disclosed which use deep (high aspect ratio) p and n contacts to create high electric fields within the carrier collection volume material of the cell. The deep contacts are fabricated using repetitive pulsed laser doping so as to create the high aspect p and n contacts. By the provision of the deep contacts which penetrate the electric field deep into the material where the high strength of the field can collect many of the carriers, thereby resulting in a high efficiency solar cell. 4 figs.

  10. Three dimensional amorphous silicon/microcrystalline silicon solar cells

    DOE Patents [OSTI]

    Kaschmitter, James L. (Pleasanton, CA)

    1996-01-01T23:59:59.000Z

    Three dimensional deep contact amorphous silicon/microcrystalline silicon (a-Si/.mu.c-Si) solar cells which use deep (high aspect ratio) p and n contacts to create high electric fields within the carrier collection volume material of the cell. The deep contacts are fabricated using repetitive pulsed laser doping so as to create the high aspect p and n contacts. By the provision of the deep contacts which penetrate the electric field deep into the material where the high strength of the field can collect many of the carriers, thereby resulting in a high efficiency solar cell.

  11. Investigation of the Role of Trap States in Solar Cell Reliability using Photothermal Deflection Spectroscopy

    E-Print Network [OSTI]

    Bezryadina, Anna Sergeyevna

    2012-01-01T23:59:59.000Z

    as coal or oil. The photovoltaic cells which constitute mostand conventional inorganic photovoltaic cells is that lightand Characterization Photovoltaic (PV) cells convert solar

  12. Core-Shell Nanopillar Array Solar Cells using Cadmium Sulfide Coating on Indium Phosphide Nanopillars

    E-Print Network [OSTI]

    Tu, Bor-An Clayton

    2013-01-01T23:59:59.000Z

    for efficient photovoltaic cells. ,” Nature Nanotechnology,Part II – Photovoltaic Cell I-V Characterization Theory andof the photovoltaic effect in the 19 th century, solar cells

  13. Single nanowire solar cells beyond the Shockley-Queisser limit

    E-Print Network [OSTI]

    Krogstrup, Peter; Heiss, Martin; Demichel, Olivier; Holm, Jeppe V; Aagesen, Martin; Nygard, Jesper; Morral, Anna Fontcuberta i

    2013-01-01T23:59:59.000Z

    Light management is of great importance to photovoltaic cells, as it determines the fraction of incident light entering the device. An optimal pn-junction combined with an optimal light absorption can lead to a solar cell efficiency above the Shockley-Queisser limit. Here, we show how this is possible by studying photocurrent generation for a single core-shell p-i-n junction GaAs nanowire solar cell grown on a silicon substrate. At one sun illumination a short circuit current of 180 mA/cm^2 is obtained, which is more than one order of magnitude higher than what would be predicted from Lambert-Beer law. The enhanced light absorption is shown to be due to a light concentrating property of the standing nanowire as shown by photocurrent maps of the device. The results imply new limits for the maximum efficiency obtainable with III-V based nanowire solar cells under one sun illumination.

  14. Solar-Hydrogen Fuel-Cell Vehicles

    E-Print Network [OSTI]

    DeLuchi, Mark A.; Ogden, Joan M.

    1993-01-01T23:59:59.000Z

    nosulfur. fA methanol/fuel-cell vehicle wouldhaveno tailpipeanalysis of fuel cell vehicles using methanol and hy- drogenused fuel-cell vehicles and (d) biomass-derived methanol

  15. INCREASED CELL EFFICIENCY IN InGaAs THIN FILM SOLAR CELLS WITH DIELECTRIC AND METAL BACK REFLECTORS

    E-Print Network [OSTI]

    Atwater, Harry

    INCREASED CELL EFFICIENCY IN InGaAs THIN FILM SOLAR CELLS WITH DIELECTRIC AND METAL BACK REFLECTORS solar cells enable very high photovoltaic efficiencies by virtue of employing different band gap materials in series- connected tandem cells to access the full solar spectrum. Researchers focused

  16. Solar Energy Materials & Solar Cells 91 (2007) 924930 Plasma-enhanced chemical vapor deposition of zinc oxide at

    E-Print Network [OSTI]

    Hicks, Robert F.

    2007-01-01T23:59:59.000Z

    Solar Energy Materials & Solar Cells 91 (2007) 924­930 Plasma-enhanced chemical vapor deposition (CIGS) or plastic substrates [1,2,8]. In this paper, we report on the deposition of aluminum- doped zinc

  17. Structured SWNTs and Graphene for Solar Cells Kehang Cui, Takaaki Chiba, Xiao Chen, Shohei Chiashi and Shigeo Maruyama*

    E-Print Network [OSTI]

    Maruyama, Shigeo

    of heterojunction solar cells and dye-sensitized solar cells (DSSCs). The structure of SWNTs was controlled nanotubes, Micro-honeycomb, SWNT-Si solar cell, Dye-sensitized solar cell, Graphene 1. Introduction Single and structural simplicity. Dye-sensitized solar cells (DSSCs)6 have the advantages of relatively high PCE values

  18. Influence of solar heating on the performance of integrated solar cell microstrip patch antennas

    SciTech Connect (OSTI)

    Roo-Ons, M.J.; Shynu, S.V.; Ammann, M.J. [Antenna and High Frequency Research Centre, School of Electronic and Communications Engineering, Dublin Institute of Technology (Ireland); Seredynski, M. [Institute of Heat Engineering, Warsaw University of Technology (Poland); McCormack, S.J. [Dept. of Civil, Structural and Environmental Engineering, Trinity College Dublin (Ireland); Norton, B. [Dublin Energy Lab., Focas Institute, Dublin Institute of Technology (Ireland)

    2010-09-15T23:59:59.000Z

    The integration of microstrip patch antennas with photovoltaics has been proposed for applications in autonomous wireless communication systems located on building facades. Full integration was achieved using polycrystalline silicon solar cells as both antenna ground plane and direct current power generation in the same device. An overview of the proposed photovoltaic antenna designs is provided and the variation characterised of the electromagnetic properties of the device with temperature and solar radiation. Measurements for both copper and solar antennas are reported on three different commercial laminates with contrasting values for thermal coefficient of the dielectric constant. (author)

  19. Method of making quasi-grain boundary-free polycrystalline solar cell structure and solar cell structure obtained thereby

    DOE Patents [OSTI]

    Gonzalez, Franklin N. (Gainesville, FL); Neugroschel, Arnost (Gainesville, FL)

    1984-02-14T23:59:59.000Z

    A new solar cell structure is provided which will increase the efficiency of polycrystalline solar cells by suppressing or completely eliminating the recombination losses due to the presence of grain boundaries. This is achieved by avoiding the formation of the p-n junction (or other types of junctions) in the grain boundaries and by eliminating the grain boundaries from the active area of the cell. This basic concept can be applied to any polycrystalline material; however, it will be most beneficial for cost-effective materials having small grains, including thin film materials.

  20. Electron Transfer Dynamics in Efficient Molecular Solar Cells

    SciTech Connect (OSTI)

    Meyer, Gerald John

    2014-10-01T23:59:59.000Z

    This research provided new mechanistic insights into surface mediated photochemical processes relevant to solar energy conversion. In this past three years our research has focused on oxidation photo-redox chemistry and on the role surface electric fields play on basic spectroscopic properties of molecular-semiconductor interfaces. Although this research as purely fundamental science, the results and their interpretation have relevance to applications in dye sensitized and photogalvanic solar cells as well as in the storage of solar energy in the form of chemical bonds.

  1. Method of making a back contacted solar cell

    DOE Patents [OSTI]

    Gee, J.M.

    1995-11-21T23:59:59.000Z

    A back-contacted solar cell is described having laser-drilled vias connecting the front-surface carrier-collector junction to an electrode grid on the back surface. The structure may also include a rear surface carrier-collector junction connected to the same grid. The substrate is connected to a second grid which is interdigitated with the first. Both grids are configured for easy series connection with neighboring cells. Several processes are disclosed to produce the cell. 2 figs.

  2. Method of making a back contacted solar cell

    DOE Patents [OSTI]

    Gee, James M. (Albuquerque, NM)

    1995-01-01T23:59:59.000Z

    A back-contacted solar cell having laser-drilled vias connecting the front-surface carrier-collector junction to an electrode grid on the back surface. The structure may also include a rear surface carrier-collector junction connected to the same grid. The substrate is connected to a second grid which is interdigitated with the first. Both grids are configured for easy series connection with neighboring cells. Several processes are disclosed to produce the cell.

  3. Comparing matched polymer:Fullerene solar cells made by solution-sequential processing and traditional blend casting: Nanoscale structure and device performance

    E-Print Network [OSTI]

    2014-01-01T23:59:59.000Z

    Bulk Heterojunction Solar Cells. J. Phys. Chem. C 2014, 118,Polythiophene:Fullerene Solar Cells. Phys. Rev. B 2008, 78,Polymer: Fullerene Solar Cells Using the External Quantum

  4. Investigation of the Role of Trap States in Solar Cell Reliability using Photothermal Deflection Spectroscopy

    E-Print Network [OSTI]

    Bezryadina, Anna Sergeyevna

    2012-01-01T23:59:59.000Z

    was achieved by First Solar company in 2011 (Figure 1.3).future solar cells by providing information to PV companies,companies can eliminate degradation process and ensure stability. Different solar

  5. Optimized scalable stack of fluorescent solar concentrator systems with bifacial silicon solar cells

    SciTech Connect (OSTI)

    Martínez Díez, Ana Luisa, E-mail: a.martinez@itma.es [Fundación ITMA, Parque Empresarial Principado de Asturias, C/Calafates, Parcela L-3.4, 33417 Avilés (Spain); Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg (Germany); Gutmann, Johannes; Posdziech, Janina; Rist, Tim; Goldschmidt, Jan Christoph [Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg (Germany); Plaza, David Gómez [Fundación ITMA, Parque Empresarial Principado de Asturias, C/Calafates, Parcela L-3.4, 33417 Avilés (Spain)

    2014-10-21T23:59:59.000Z

    In this paper, we present a concentrator system based on a stack of fluorescent concentrators (FCs) and a bifacial solar cell. Coupling bifacial solar cells to a stack of FCs increases the performance of the system and preserves its efficiency when scaled. We used an approach to optimize a fluorescent solar concentrator system design based on a stack of multiple fluorescent concentrators (FC). Seven individual fluorescent collectors (20 mm×20 mm×2 mm) were realized by in-situ polymerization and optically characterized in regard to their ability to guide light to the edges. Then, an optimization procedure based on the experimental data of the individual FCs was carried out to determine the stack configuration that maximizes the total number of photons leaving edges. Finally, two fluorescent concentrator systems were realized by attaching bifacial silicon solar cells to the optimized FC stacks: a conventional system, where FC were attached to one side of the solar cell as a reference, and the proposed bifacial configuration. It was found that for the same overall FC area, the bifacial configuration increases the short-circuit current by a factor of 2.2, which is also in agreement with theoretical considerations.

  6. N-PERT BACK JUNCTION SOLAR CELLS: AN OPTION FOR THE NEXT INDUSTRIAL TECHNOLOGY GENERATION?

    E-Print Network [OSTI]

    are introducing a new solar cell design: the Passivated Emitter and Rear Cell (PERC), which features a full-PERT (Passivated Emitter, Rear Totally Diffused) solar cells with a processing sequence based on an industrialN-PERT BACK JUNCTION SOLAR CELLS: AN OPTION FOR THE NEXT INDUSTRIAL TECHNOLOGY GENERATION? Bianca

  7. LBIC ANALYSIS OF THIN-FILM POLYCRYSTALLINE SOLAR CELLS James R. Sites and Timothy J. Nagle

    E-Print Network [OSTI]

    Sites, James R.

    -film polycrystalline solar cells, such as CdTe and CIGS, and the overall performance of these cells. LBIC is uniquelyLBIC ANALYSIS OF THIN-FILM POLYCRYSTALLINE SOLAR CELLS James R. Sites and Timothy J. Nagle Physics response map, was developed and used to map defects in thin-film solar cells [4]. Improvements to the two

  8. Polyx multicrystalline silicon solar cells processed by PF+5 unanalysed ion implantation and rapid thermal annealing

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    695 Polyx multicrystalline silicon solar cells processed by PF+5 unanalysed ion implantation of terrestrial solar cells as compared to classical furnace or pulsed laser annealing. Unfortunately, drawbacks for the fabrication of solar cells. It offers the possibility of achieving strong reduction of cell cost in spite

  9. innovati nAward-Winning Etching Process Cuts Solar Cell Costs

    E-Print Network [OSTI]

    innovati nAward-Winning Etching Process Cuts Solar Cell Costs In general, when it comes to photovoltaic (PV) solar cells, the higher their efficiency, the higher their price tag. To increase cell-efficiency crystalline silicon solar cells based on an innovative antireflection approach that promises to significantly

  10. Silicon Solar Cell Light-Trapping Using Defect Mode Photonic Kelsey A. Whitesell*a

    E-Print Network [OSTI]

    Atwater, Harry

    Silicon Solar Cell Light-Trapping Using Defect Mode Photonic Crystals Kelsey A. Whitesell to enhance performance of thin film solar cells because of their unique ability to control light. We show crystalline silicon solar cells of up to 205% from = 300nm to 1100nm compared to a planar cell

  11. Light-trapping in dye-sensitized solar cells Stephen Foster* and Sajeev John

    E-Print Network [OSTI]

    John, Sajeev

    Light-trapping in dye-sensitized solar cells Stephen Foster* and Sajeev John We demonstrate numerically that photonic crystal dye-sensitized solar cells (DSSCs) can provide at least a factor of one researched is the dye-sensitized solar cell (DSSC). These cells are inexpensive to make and boast power

  12. Preprint 24th EU PVSEC, 2009, Hamburg FITTING OF LATERAL RESISTANCES IN SILICON SOLAR CELLS

    E-Print Network [OSTI]

    Junk, Michael

    Preprint 24th EU PVSEC, 2009, Hamburg FITTING OF LATERAL RESISTANCES IN SILICON SOLAR CELLS cell from electroluminescence (EL) is introduced. A two-dimensional model of the solar cell screen printed monocrystalline silicon solar cell are shown and the influence of lateral diffusion

  13. New approaches for high-efficiency solar cells. Final report

    SciTech Connect (OSTI)

    Bedair, S.M.; El-Masry, N.A. [North Carolina State Univ., Raleigh, NC (United States)

    1997-12-01T23:59:59.000Z

    This report summarizes the activities carried out in this subcontract. These activities cover, first the atomic layer epitaxy (ALE) growth of GaAs, AlGaAs and InGaP at fairly low growth temperatures. This was followed by using ALE to achieve high levels of doping both n-type and p-type required for tunnel junctions (Tj) in the cascade solar cell structures. Then the authors studied the properties of AlGaAs/InGaP and AlGaAs/GaAs tunnel junctions and their performances at different growth conditions. This is followed by the use of these tunnel junctions in stacked solar cell structures. The effect of these tunnel junctions on the performance of stacked solar cells was studied at different temperatures and different solar fluences. Finally, the authors studied the effect of different types of black surface fields (BSF), both p/n and n/p GaInP solar cell structures, and their potential for window layer applications. Parts of these activities were carried in close cooperation with Dr. Mike Timmons of the Research Triangle Institute.

  14. Fabrication of solar cells with counter doping prevention

    DOE Patents [OSTI]

    Dennis, Timothy D; Li, Bo; Cousins, Peter John

    2013-02-19T23:59:59.000Z

    A solar cell fabrication process includes printing of dopant sources over a polysilicon layer over backside of a solar cell substrate. The dopant sources are cured to diffuse dopants from the dopant sources into the polysilicon layer to form diffusion regions, and to crosslink the dopant sources to make them resistant to a subsequently performed texturing process. To prevent counter doping, dopants from one of the dopant sources are prevented from outgassing and diffusing into the other dopant source. For example, phosphorus from an N-type dopant source is prevented from diffusing to a P-type dopant source comprising boron.

  15. Thin film solar cell including a spatially modulated intrinsic layer

    DOE Patents [OSTI]

    Guha, Subhendu (Troy, MI); Yang, Chi-Chung (Troy, MI); Ovshinsky, Stanford R. (Bloomfield Hills, MI)

    1989-03-28T23:59:59.000Z

    One or more thin film solar cells in which the intrinsic layer of substantially amorphous semiconductor alloy material thereof includes at least a first band gap portion and a narrower band gap portion. The band gap of the intrinsic layer is spatially graded through a portion of the bulk thickness, said graded portion including a region removed from the intrinsic layer-dopant layer interfaces. The band gap of the intrinsic layer is always less than the band gap of the doped layers. The gradation of the intrinsic layer is effected such that the open circuit voltage and/or the fill factor of the one or plural solar cell structure is enhanced.

  16. Process Development for High Voc CdTe Solar Cells

    SciTech Connect (OSTI)

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

    2011-05-01T23:59:59.000Z

    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.

  17. Copper doped polycrystalline silicon solar cell

    DOE Patents [OSTI]

    Lovelace, Alan M. Administrator of the National Aeronautics and Space (La Canada, CA); Koliwad, Krishna M. (La Canada, CA); Daud, Taher (La Crescenta, CA)

    1981-01-01T23:59:59.000Z

    Photovoltaic cells having improved performance are fabricated from polycrystalline silicon containing copper segregated at the grain boundaries.

  18. Moon's Radiation Environment and Expected Performance of Solar Cells during Future Lunar Missions

    E-Print Network [OSTI]

    T. E Girish; S Aranya

    2010-12-03T23:59:59.000Z

    Several lunar missions are planned ahead and there is an increasing demand for efficient photovoltaic power generation in the moon. The knowledge of solar cell operation in the lunar surface obtained during early seventies need to be updated considering current views on solar variability and emerging space solar cell technologies. In this paper some aspects of the solar cell performance expected under variable lunar radiation environment during future space missions to moon are addressed. We have calculated relative power expected from different types of solar cells under extreme solar proton irradiation conditions and high lunar daytime temperature. It is also estimated that 2-3 % of annual solar cell degradation is most probable during the future lunar missions. We have also discussed photovoltaic power generation in long term lunar bases emphasizing technological needs such as sunlight concentration, solar cell cooling and magnetic shielding of radiation for improving the efficiency of solar cells in the lunar environment.

  19. Moon's Radiation Environment and Expected Performance of Solar Cells during Future Lunar Missions

    E-Print Network [OSTI]

    Girish, T E

    2010-01-01T23:59:59.000Z

    Several lunar missions are planned ahead and there is an increasing demand for efficient photovoltaic power generation in the moon. The knowledge of solar cell operation in the lunar surface obtained during early seventies need to be updated considering current views on solar variability and emerging space solar cell technologies. In this paper some aspects of the solar cell performance expected under variable lunar radiation environment during future space missions to moon are addressed. We have calculated relative power expected from different types of solar cells under extreme solar proton irradiation conditions and high lunar daytime temperature. It is also estimated that 2-3 % of annual solar cell degradation is most probable during the future lunar missions. We have also discussed photovoltaic power generation in long term lunar bases emphasizing technological needs such as sunlight concentration, solar cell cooling and magnetic shielding of radiation for improving the efficiency of solar cells in the l...

  20. SIMULATION OF GEOMETRY AND SHADOW EFFECTS IN 3D ORGANIC POLYMER SOLAR CELLS

    E-Print Network [OSTI]

    Kassegne, Samuel Kinde

    levels of Solar panels and new production capacity is driving solar PV prices lower and thereby, bringingSIMULATION OF GEOMETRY AND SHADOW EFFECTS IN 3D ORGANIC POLYMER SOLAR CELLS OF THE THESIS Simulation of Geometry and Shadow Effects in 3D Organic Polymer Solar Cells by Mihir Prakashbhai

  1. Probing the Electronic Structure of a Photoexcited Solar Cell Dye with Transient X-ray Absorption Spectroscopy

    E-Print Network [OSTI]

    Kuiken, Benjamin E. Van

    2014-01-01T23:59:59.000Z

    Pettersson, H.Dye-Sensitized Solar Cells Chem. Rev. 2010,Photo-Sensitizers in Grätzel Solar Cells: Quantum-ChemicalSensitizing Dyes in Solar Cells J. Phys. Chem. C 2008, 113,

  2. Band Gap Energy of Chalcopyrite Thin Film Solar Cell Absorbers Determined by Soft X-Ray Emission and Absorption Spectroscopy

    E-Print Network [OSTI]

    Bar, M.

    2010-01-01T23:59:59.000Z

    8] J.R. Tuttle et al. , Solar Cells 30, 21 (1991). [9] D.OF CHALCOPYRITE THIN FILM SOLAR CELL ABSORBERS DETERMINED BYchalcopyrite thin film solar cell absorbers significantly

  3. Substrate for thin silicon solar cells

    DOE Patents [OSTI]

    Ciszek, Theodore F. (Evergreen, CO)

    1995-01-01T23:59:59.000Z

    A photovoltaic device for converting solar energy into electrical signals comprises a substrate, a layer of photoconductive semiconductor material grown on said substrate, wherein the substrate comprises an alloy of boron and silicon, the boron being present in a range of from 0.1 to 1.3 atomic percent, the alloy having a lattice constant substantially matched to that of the photoconductive semiconductor material and a resistivity of less than 1.times.10.sup.-3 ohm-cm.

  4. Substrate for thin silicon solar cells

    DOE Patents [OSTI]

    Ciszek, T.F.

    1995-03-28T23:59:59.000Z

    A photovoltaic device for converting solar energy into electrical signals comprises a substrate, a layer of photoconductive semiconductor material grown on said substrate, wherein the substrate comprises an alloy of boron and silicon, the boron being present in a range of from 0.1 to 1.3 atomic percent, the alloy having a lattice constant substantially matched to that of the photoconductive semiconductor material and a resistivity of less than 1{times}10{sup {minus}3} ohm-cm. 4 figures.

  5. Design of Zinc Oxide Based Solid-State Excitonic Solar Cell with Improved Efficiency 

    E-Print Network [OSTI]

    Lee, Tao Hua

    2012-02-14T23:59:59.000Z

    Excitonic photovoltaic devices, including organic, hybrid organic/inorganic, and dye-sensitized solar cells, are attractive alternatives to conventional inorganic solar cells due to their potential for low cost and low temperature solution...

  6. Development of low-temperature solution-processed colloidal quantum dot-based solar cells

    E-Print Network [OSTI]

    Chang, Liang-Yi, Ph. D. Massachusetts Institute of Technology

    2013-01-01T23:59:59.000Z

    Solution-processed solar cells incorporating organic semiconductors and inorganic colloidal quantum dots (QDs) are potential alternatives to conventional solar cells fabricated via vacuum or high-temperature sintering ...

  7. Effective Panchromatic Sensitization of Electrochemical Solar Cells: Strategy and Organizational Rules for Spatial Separation of

    E-Print Network [OSTI]

    -neutral sources. Dye- sensitized solar cells (DSCs), comprising chromophores, redox shuttles, and nanoporousEffective Panchromatic Sensitization of Electrochemical Solar Cells: Strategy and Organizational National Laboratory, Argonne, Illinois 60439, United States *S Supporting Information ABSTRACT: Dye-sensitized

  8. Design of Zinc Oxide Based Solid-State Excitonic Solar Cell with Improved Efficiency

    E-Print Network [OSTI]

    Lee, Tao Hua

    2012-02-14T23:59:59.000Z

    Excitonic photovoltaic devices, including organic, hybrid organic/inorganic, and dye-sensitized solar cells, are attractive alternatives to conventional inorganic solar cells due to their potential for low cost and low temperature solution...

  9. a-si solar cells: Topics by E-print Network

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

    for the development of amorphous Si solar cells Seung May 2010 Keywords: a-Si:H Thin film Si solar cell Spectroscopic ellipsometry (SE) a b s t r a c t We Park, Byungwoo...

  10. a-si solar cell: Topics by E-print Network

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

    for the development of amorphous Si solar cells Seung May 2010 Keywords: a-Si:H Thin film Si solar cell Spectroscopic ellipsometry (SE) a b s t r a c t We Park, Byungwoo...

  11. Optical system for determining physical characteristics of a solar cell

    DOE Patents [OSTI]

    Sopori, Bhushan L. (Denver, CO)

    2001-01-01T23:59:59.000Z

    The invention provides an improved optical system for determining the physical characteristics of a solar cell. The system comprises a lamp means for projecting light in a wide solid-angle onto the surface of the cell; a chamber for receiving the light through an entrance port, the chamber having an interior light absorbing spherical surface, an exit port for receiving a beam of light reflected substantially normal to the cell, a cell support, and an lower aperture for releasing light into a light absorbing baffle; a means for dispersing the reflection into monochromatic components; a means for detecting an intensity of the components; and a means for reporting the determination.

  12. Amorphous Siliconbased Solar Cells Xunming Deng1

    E-Print Network [OSTI]

    Schiff, Eric A.

    semiconductors proved unsuitable for making efficient cells. Handbook of Photovoltaic Science and Engineering properties; they were building on earlier work by Chittick, Sterling, and Alexander [3]. Glow discharges

  13. PhotovoltaicsPhotovoltaics: the equations for solar: the equations for solar--cell designcell design

    E-Print Network [OSTI]

    Pulfrey, David L.

    design LECTURE 5 · photovoltaic effect · the equation set · simplifying the equation set · absorption, Germany 90 MW Sarnia, Ontario 5kW Boston Massachusetts http://256.com/solar/ #12;3 The Photovoltaic EffectThe Photovoltaic EffectSec. 7.0 Is the full Device Equation Set needed to design and analyze a cell like this one

  14. Internal quantum efficiency analysis of solar cell by genetic algorithm

    SciTech Connect (OSTI)

    Xiong, Kanglin; Yang, Hui [Institute of Semiconductors, CAS, No. A35, Qing Hua East Road, Beijing 100083 (China); Suzhou Institute of Nano-tech and Nano-bionics, CAS, Ruoshui Road 398, Suzhou 215125 (China); Lu, Shulong; Zhou, Taofei; Wang, Rongxin; Qiu, Kai; Dong, Jianrong [Suzhou Institute of Nano-tech and Nano-bionics, CAS, Ruoshui Road 398, Suzhou 215125 (China); Jiang, Desheng [Institute of Semiconductors, CAS, No. A35, Qing Hua East Road, Beijing 100083 (China)

    2010-11-15T23:59:59.000Z

    To investigate factors limiting the performance of a GaAs solar cell, genetic algorithm is employed to fit the experimentally measured internal quantum efficiency (IQE) in the full spectra range. The device parameters such as diffusion lengths and surface recombination velocities are extracted. Electron beam induced current (EBIC) is performed in the base region of the cell with obtained diffusion length agreeing with the fit result. The advantage of genetic algorithm is illustrated. (author)

  15. 0.7-eV GaInAs Junction for a GaInP/GaAs/GaInAs(1-eV)/GaInAs(0.7-eV) Four-Junction Solar Cell: Preprint

    SciTech Connect (OSTI)

    Friedman, D. J.; Geisz, J. F.; Norman, A. G.; Wanlass, M. W.; Kurtz, S. R.

    2006-05-01T23:59:59.000Z

    We discuss recent developments in III-V multijunction solar cells, focusing on adding a fourth junction to the Ga0.5In0.5P/GaAs/Ga0.75In0.25As inverted three-junction cell. This cell, grown inverted on GaAs so that the lattice-mismatched Ga0.75In0.25As third junction is the last one grown, has demonstrated 38% efficiency, and 40% is likely in the near future. To achieve still further gains, a lower-bandgap GaxIn1-xAs fourth junction could be added to the three-junction structure for a four-junction cell whose efficiency could exceed 45% under concentration. Here, we present the initial development of the GaxIn1-xAs fourth junction. Junctions of various bandgaps ranging from 0.88 to 0.73 eV were grown, in order to study the effect of the different amounts of lattice mismatch. At a bandgap of 0.88 eV, junctions were obtained with very encouraging {approx}80% quantum efficiency, 57% fill factor, and 0.36 eV open-circuit voltage. The device performance degrades with decreasing bandgap (i.e., increasing lattice mismatch). We model the four-junction device efficiency vs. fourth junction bandgap to show that an 0.7-eV fourth-junction bandgap, while optimal if it could be achieved in practice, is not necessary; an 0.9-eV bandgap would still permit significant gains in multijunction cell efficiency while being easier to achieve than the lower-bandgap junction.

  16. Panoramic view of electrochemical pseudocapacitor and organic solar cell research in molecularly engineered energy materials (MEEM)

    E-Print Network [OSTI]

    2014-01-01T23:59:59.000Z

    Photodiodes from Interpenetrating Polymer Networks. NaturePolymer Solar Cells with Nanoscale Control of the Interpenetrating Network

  17. High throughput parallel backside contacting and periodic texturing for high-efficiency solar cells

    DOE Patents [OSTI]

    Daniel, Claus; Blue, Craig A.; Ott, Ronald D.

    2014-08-19T23:59:59.000Z

    Disclosed are configurations of long-range ordered features of solar cell materials, and methods for forming same. Some features include electrical access openings through a backing layer to a photovoltaic material in the solar cell. Some features include textured features disposed adjacent a surface of a solar cell material. Typically the long-range ordered features are formed by ablating the solar cell material with a laser interference pattern from at least two laser beams.

  18. Manufacturing-Friendly Advance Seen in CIGS Solar Cell Processing (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2011-05-01T23:59:59.000Z

    Scientists developed a robust, high-performance amorphous InZnO transparent contact for CIGS solar cells.

  19. Photovoltaic Measurements in Single-Nanowire Silicon Solar Cells

    E-Print Network [OSTI]

    Atwater, Harry

    Photovoltaic Measurements in Single-Nanowire Silicon Solar Cells Michael D. Kelzenberg, Daniel B-voltage measurements were made under simulated Air Mass 1.5 global illumination. Photovoltaic spectral response work by our group has shown that macroscopic Si wire arrays (>1 cm2 in area) suitable for photovoltaic

  20. NREL Success Stories - Quest for Inexpensive Silicon Solar Cells

    ScienceCinema (OSTI)

    Branz, Howard

    2013-05-29T23:59:59.000Z

    Scientists at the National Renewable Energy Laboratory (NREL) share their story about a successful partnership with Oak Ridge National Laboratory and the Ampulse Corporation and how support from the US Department of Energy's Technology Commercialization & Deployment Fund has helped it and their silicon solar cell research thrive.

  1. Enhanced regeneration of degraded polymer solar cells by thermal annealing

    SciTech Connect (OSTI)

    Kumar, Pankaj, E-mail: pankaj@mail.nplindia.ernet.in [CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012 (India); Centre for Organic Electronics, Physics, University of Newcastle, Callaghan NSW-2308 (Australia); Bilen, Chhinder; Zhou, Xiaojing; Belcher, Warwick J.; Dastoor, Paul C., E-mail: Paul.Dastoor@newcastle.edu.au [Centre for Organic Electronics, Physics, University of Newcastle, Callaghan NSW-2308 (Australia); Feron, Krishna [Centre for Organic Electronics, Physics, University of Newcastle, Callaghan NSW-2308 (Australia); CSIRO Energy Technology, P. O. Box 330, Newcastle NSW 2300 (Australia)

    2014-05-12T23:59:59.000Z

    The degradation and thermal regeneration of poly(3-hexylethiophene) (P3HT):[6,6]-phenyl-C{sub 61}-butyric acid methyl ester (PCBM) and P3HT:indene-C{sub 60} bisadduct (ICBA) polymer solar cells, with Ca/Al and Ca/Ag cathodes and indium tin oxide/poly(ethylene-dioxythiophene):polystyrene sulfonate anode have been investigated. Degradation occurs via a combination of three primary pathways: (1) cathodic oxidation, (2) active layer phase segregation, and (3) anodic diffusion. Fully degraded devices were subjected to thermal annealing under inert atmosphere. Degraded solar cells possessing Ca/Ag electrodes were observed to regenerate their performance, whereas solar cells having Ca/Al electrodes exhibited no significant regeneration of device characteristics after thermal annealing. Moreover, the solar cells with a P3HT:ICBA active layer exhibited enhanced regeneration compared to P3HT:PCBM active layer devices as a result of reduced changes to the active layer morphology. Devices combining a Ca/Ag cathode and P3HT:ICBA active layer demonstrated ?50% performance restoration over several degradation/regeneration cycles.

  2. Unraveling the Role of Morphology on Organic Solar Cell Performance

    E-Print Network [OSTI]

    Biswajit Ray; Pradeep R. Nair; Muhammad A. Alam

    2010-11-03T23:59:59.000Z

    Polymer based organic photovoltaic (OPV) technology offers a relatively inexpensive option for solar energy conversion provided its efficiency increases beyond the current level (6-7%) along with significant improvements in operational lifetime. The critical aspect of such solar cells is the complex morphology of distributed bulk heterojunctions, which plays the central role in the conversion of photo-generated excitons to electron-hole pairs. However, the fabrication conditions that can produce the optimal morphology are still unknown due to the lack of quantitative understanding of the effects of process variables on the cell morphology. In this article, we develop a unique process-device co-simulation framework based on phase-field model for phase separation coupled with self-consistent drift-diffusion transport to quantitatively explore the effects of the process conditions (e.g., annealing temperature, mixing ratio, anneal duration) on the organic solar cell performance. Our results explain experimentally observed trends of open circuit voltage and short circuit current that would otherwise be deemed anomalous from the perspective of conventional solar cells. In addition to providing an optimization framework for OPV technology, our morphology-aware modeling approach is ideally suited for a wide class of problems involving porous materials, block co-polymers, polymer colloids, OLED devices etc.

  3. Emerging High-Efficiency Low-Cost Solar Cell Technologies

    E-Print Network [OSTI]

    McGehee, Michael

    Emerging High-Efficiency Low-Cost Solar Cell Technologies Mike McGehee Materials Science and Engineering Center for Advanced Molecular Photovoltaics Bay Area Photovoltaic Consortium Precourt Institute for Energy Stanford University #12;Source: US DOE report "$1/W Photovoltaic Systems," August 2010. DOE

  4. EELE408 Photovoltaics Lecture 11: Solar Cell Parameters

    E-Print Network [OSTI]

    Kaiser, Todd J.

    mV ­ Commercial silicon solar cells 500-600 mV 11 Power & IV Curve · Power (Watts) is the rate · The power output by a source is the product of the current supplied and the voltage at which the current was supplied 12 · Power output = Source voltage x Source current ­ P=V x I (Watts = Joules/second) = (Volts

  5. Biomimetic Dye Molecules for Solar Cells

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041clothAdvanced Materials Advanced Materials Find Find MoreTechnicalBiomimetic Dye Molecules for Solar

  6. Intermediate-band solar cells based on quantum dot supracrystals Q. Shao and A. A. Balandina

    E-Print Network [OSTI]

    parameter in the photovoltaic PV solar cell technology. It is defined as = FFVocJsc Pin , 1 where FFIntermediate-band solar cells based on quantum dot supracrystals Q. Shao and A. A. Balandina Nano to implement the intermediate-band solar cell with the efficiency exceeding the Shockley-Queisser limit

  7. Solar Cells from Earth-Abundant Semiconductors with Plasmon-Enhanced Light Absorption

    SciTech Connect (OSTI)

    Atwater, Harry

    2012-04-30T23:59:59.000Z

    Progress is reported in these areas: Plasmonic Light Trapping in Thin Film a-Si Solar Cells; Plasmonic Light Trapping in Thin InGaN Quantum Well Solar Cells; and Earth Abundant Cu{sub 2}O and Zn{sub 3}P{sub 2} Solar Cells.

  8. Light trapping in solar cells at the extreme coupling limit Ali Naqavi,1,2,

    E-Print Network [OSTI]

    Petitpierre, Claude

    Light trapping in solar cells at the extreme coupling limit Ali Naqavi,1,2, * Franz-Josef Haug,1 thin film silicon solar cells in the low absorption regime. We consider simultaneously wavelength.1950, 130.2790. 1. INTRODUCTION Enhancing light absorption in solar cells has been a topic of research

  9. Semiconductor heterostructures and optimization of light-trapping structures for efficient thin-film solar cells

    E-Print Network [OSTI]

    Yu, Edward T.

    applications. However, one of the most persistent issues in solar cell design continues to be how to most and integration of active and passive media in solar cells. Myriad photonic structures containing sub of semiconductor nanostructures have inspired a host of new solar cell structures, including designs based

  10. CIGS Solar Cell on Flexible Stainless Steel Substrate Fabricated by Sputtering Method: Simulation and Experimental Results

    E-Print Network [OSTI]

    Kanicki, Jerzy

    CIGS Solar Cell on Flexible Stainless Steel Substrate Fabricated by Sputtering Method: Simulation-electronic properties of the Cu(InGa)Se2(CIGS) solar cell fabricated by sputtering method on stainless steel substrate are consistent with each other. 1. Introduction Flexible Cu In Ga Se (CIGS) solar cells are very attractive

  11. EARTH ABUNDANT MATERIALS FOR HIGH EFFICIENCY HETEROJUNCTION THIN FILM SOLAR CELLS

    E-Print Network [OSTI]

    Ceder, Gerbrand

    materials for thin film solar cells such as CdTe and CIGS suffer from concerns over resource scarcity (eEARTH ABUNDANT MATERIALS FOR HIGH EFFICIENCY HETEROJUNCTION THIN FILM SOLAR CELLS Yun Seog Lee 1 conversion efficiencies should be increased. In terms of reducing module cost, thin film solar cells

  12. Numerical Modeling of CIGS Solar Cells: Definition of the Baseline and

    E-Print Network [OSTI]

    Sites, James R.

    Thesis Numerical Modeling of CIGS Solar Cells: Definition of the Baseline and Explanation our supervision by Markus Gloeckler entitled "Numerical Modeling of CIGS Solar Cells: Definition. A three-layer structure, simulating a Cu(InGa)Se2 (CIGS) heterojunction solar cell, was set up using

  13. Effects of Series Resistance and Inductance on Solar Cell Admittance Measurements(a)

    E-Print Network [OSTI]

    Scofield, John H.

    on a variety of 0.43 cm2 area, copper indium gallium diselenide (CIGS) polycrystalline thin film solar cellsEffects of Series Resistance and Inductance on Solar Cell Admittance Measurements(a) John H Energy Materials and Solar Cells on April 17, 1994) Admittance measurements have been performed

  14. Diffusion of indium and gallium in Cu(In,Ga)Se2 thin film solar cells

    E-Print Network [OSTI]

    Rockett, Angus

    conversion efficiency of solar cells made from this material [1]. One of the special qualities of the CIGS improve the solar cell performance. In many of the different CIGS fabrication techniques, an in depthDiffusion of indium and gallium in Cu(In,Ga)Se2 thin film solar cells O. Lundberga,*, J. Lua , A

  15. Measuring sheet resistance of CIGS solar cell's window layer by spatially resolved electroluminescence imaging

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1/12 Measuring sheet resistance of CIGS solar cell's window layer by spatially resolved model to simulate the behavior of CIGS solar cells based on the spread sheet resistance effect on the determination of the window layer sheet resistance in CIGS solar cells, but our approach could be transferred

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

    E-Print Network [OSTI]

    Sites, James R.

    NUMERICAL MODELING OF CIGS AND CdTe SOLAR CELLS: SETTING THE BASELINE M. Gloeckler, A important complications that are often found in experimental CIGS and CdTe solar cells. 1. INTRODUCTION Numerical modeling of polycrystalline thin-film solar cells is an important strategy to test the viability

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

    E-Print Network [OSTI]

    Maruyama, Shigeo

    CNT-SI HETEROJUNCTION SOLAR CELLS WITH STRUCTURE- CONTROLLED SINGLE-WALL CARBON NANOTUBE FILMS solar cells. We proposed a water-vapor treatment to build up SWNTs to a self-assembled micro- honeycomb network for the application of solar cells [1]. The micro-honeycomb network consists of vertical

  18. Device Characteristics of Bulk-Heterojunction Polymer Solar Cells (DMR-0819860)

    E-Print Network [OSTI]

    Petta, Jason

    Device Characteristics of Bulk-Heterojunction Polymer Solar Cells (DMR-0819860) H. Wang, E. Gomez University Polymer solar cells are important candidates for sustainable, low-cost energy generation of vertical compositional heterogeneities on charge transport in polymer solar cells via modular construction

  19. DISSERTATION ANTICIPATED PERFORMANCE OF Cu(In,Ga)Se2 SOLAR CELLS IN THE

    E-Print Network [OSTI]

    Sites, James R.

    i DISSERTATION ANTICIPATED PERFORMANCE OF Cu(In,Ga)Se2 SOLAR CELLS IN THE THIN-FILM LIMIT Submitted ENTITLED `ANTICIPATED PERFORMANCE OF Cu(In,Ga)Se2 SOLAR CELLS IN THE THIN-FILM LIMIT' BE ACCEPTED(In,Ga)Se2 SOLAR CELLS IN THE THIN-FILM LIMIT The demand for alternative sources of energy is rapidly

  20. Silicon epitaxy below 200C: Towards thin crystalline solar cells R. Carioua,b

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Silicon epitaxy below 200°C: Towards thin crystalline solar cells R. Carioua,b , R. Ruggeria,c , P spectroscopic ellipsometry and HRTEM measurements. Moreover, we build heterojunction solar cells with intrinsic of current devices. KEYWORDS Silicon epitaxy, RF-PECVD, low temperature, thin crystalline solar cells

  1. Evaluation of Circular-Shaped Features on the Surface of Solar Cells from the

    E-Print Network [OSTI]

    Evaluation of Circular-Shaped Features on the Surface of Solar Cells from the Hubble Space by the manufacturer of the CMX coverglass of the HST solar cells, circular shaped features of unknown origin were The Hubble Space Telescope is powered by solar cells which are arranged on two flexible wings. During

  2. SOLAR CELL BASED PYRANOMETERS: EVALUATION OF THE DIFFUSE RESPONSE Frank Vignola

    E-Print Network [OSTI]

    Oregon, University of

    260 SOLAR CELL BASED PYRANOMETERS: EVALUATION OF THE DIFFUSE RESPONSE Frank Vignola Department The responsivity to diffuse radiation of a solar cell based pyranometer is studied. Diffuse measurements are made of the LiCor pyranometer is presented. Implication of the spectral dependence of the solar cell based

  3. Optimization of the absorption efficiency of an amorphous-silicon thin-film tandem solar cell

    E-Print Network [OSTI]

    to bring down the cost of photovoltaic (PV) solar cells has gained huge momentum, and many strategiesOptimization of the absorption efficiency of an amorphous-silicon thin-film tandem solar cell-wave approach was used to compute the plane-wave absorptance of a thin-film tandem solar cell with a metallic

  4. NANOSTRUCTURED SOLAR CELLS FOR HIGH EFFICIENCY PHOTOVOLTAICS Christiana B. Honsberg1

    E-Print Network [OSTI]

    Honsberg, Christiana

    mechanisms and device structures and materials to implement nanostructured solar cells, and low cost to lattice matching and; (3) the potential for low cost solar cell structures using self to circumvent both existing efficiency and cost drivers. While nanostructured solar cells have significant

  5. Coupled optical and electrical modeling of solar cell based on conical pore silicon photonic crystals

    E-Print Network [OSTI]

    John, Sajeev

    a significant part of silicon solar cell cost. Thin film technology is a promising way to avoid these costCoupled optical and electrical modeling of solar cell based on conical pore silicon photonic://jap.aip.org/authors #12;Coupled optical and electrical modeling of solar cell based on conical pore silicon photonic

  6. Nanowire-Based All-Oxide Solar Cells Benjamin D. Yuhas and Peidong Yang*

    E-Print Network [OSTI]

    Yang, Peidong

    electricity cost from a silicon solar cell well above that which comes from coal- or gas-burning power plantsNanowire-Based All-Oxide Solar Cells Benjamin D. Yuhas and Peidong Yang* Department of Chemistry present an all-oxide solar cell fabricated from vertically oriented zinc oxide nanowires and cuprous oxide

  7. Angular constraint on light-trapping absorption enhancement in solar cells and Shanhui Fan

    E-Print Network [OSTI]

    Fan, Shanhui

    trapping results in a thinner active region in a solar cell, which lowers the pro- duction cost by reducingAngular constraint on light-trapping absorption enhancement in solar cells Zongfu Yua and Shanhui 2010; accepted 5 December 2010; published online 4 January 2011 Light trapping for solar cells can

  8. Conventional and 360 degree electron tomography of a micro-crystalline silicon solar cell

    E-Print Network [OSTI]

    Dunin-Borkowski, Rafal E.

    for use as the active absorber layer in low cost solar cells [1], for which efficiencies higher than 8Conventional and 360 degree electron tomography of a micro- crystalline silicon solar cell M thereafter) in micro-crystalline silicon (µc-Si:H) solar cell. The limitations of inferring the 3D geometry

  9. The ultra-thin solar cells that could generate power through windows

    E-Print Network [OSTI]

    Rogers, John A.

    international companies are making thin-film solar cells, but they are typically less efficient at convertingThe ultra-thin solar cells that could generate power through windows By Claire Bates Last updated at 11:11 AM on 06th October 2008 Solar cells that are transparent enough to be used to tint windows

  10. EE580 Solar Cell Basics for Teachers Dr. Todd J. Kaiser

    E-Print Network [OSTI]

    Kaiser, Todd J.

    1 EE580 Solar Cell Basics for Teachers Dr. Todd J. Kaiser Cobleigh 531 994-7276 tjkaiser and Protocol 1Montana State University: Solar Cells Lecture 1: Introduction Course Objectives · Train Teachers in the Science behind Solar Cells · Introduce the student to the techniques and equipment used

  11. CNT-Si heterojunction solar cell with single-walled carbon nanotubes Shigeo Maruyama

    E-Print Network [OSTI]

    Maruyama, Shigeo

    CNT-Si heterojunction solar cell with single-walled carbon nanotubes Shigeo Maruyama Department solar cells. We proposed a water vapor treatment to build up SWNTs to a self-assembled micro-honeycomb network for the application of solar cells [1]. The micro- honeycomb network consists of vertical

  12. FABRICATION AND CHARACTERIZATION OF 3-D ALL POLYMER FLEXIBLE SOLAR CELL

    E-Print Network [OSTI]

    Kassegne, Samuel Kinde

    FABRICATION AND CHARACTERIZATION OF 3-D ALL POLYMER FLEXIBLE SOLAR CELL _______________ A Thesis and Characterization of 3-D All Polymer Flexible Solar Cell by Krishna Ashwinbhai Desai Master of Science in Mechanical (Polyethylene terephthalate) as a flexible substrate, a potentially wearable organic solar cell is enabled

  13. Molecular Packing and Solar Cell Performance in Blends of Polymers with a Bisadduct Fullerene

    E-Print Network [OSTI]

    McGehee, Michael

    Molecular Packing and Solar Cell Performance in Blends of Polymers with a Bisadduct Fullerene States *S Supporting Information ABSTRACT: We compare the solar cell performance of several polymers the efficiency of the solar cells only when they do not intercalate between the polymer side chains. When

  14. Demo: Organic Solar Cell-equipped Energy Harvesting Active Networked Tag (EnHANT) Prototypes

    E-Print Network [OSTI]

    Carloni, Luca

    Demo: Organic Solar Cell-equipped Energy Harvesting Active Networked Tag (EnHANT) Prototypes Gerald harvesting and communications hardware, namely organic solar cells and ultra-wide-band impulse radio (UWB harvesting, organic solar cells, ultra-low-power com- munications, ultra-wideband impulse radio, energy

  15. Controlled Growth of Single-Walled Carbon Nanotubes for CNT-Si heterojunction solar cell

    E-Print Network [OSTI]

    Maruyama, Shigeo

    Controlled Growth of Single-Walled Carbon Nanotubes for CNT-Si heterojunction solar cell Shigeo two different SWNT assemblies for SWNT-Si heterojuction solar cells. We proposed a water vapor treatment to build up SWNTs to a self-assembled micro-honeycomb network for the application of solar cells

  16. Simulations of solar cell absorption enhancement using resonant modes of a nanosphere array

    E-Print Network [OSTI]

    Grandidier, Jonathan

    Simulations of solar cell absorption enhancement using resonant modes of a nanosphere array an approach for enhancing the absorption of thin-film amorphous silicon solar cells using periodic on the temporal coupled mode theory. Keywords: Resonant Dielectric Structures, Solar cells, Nanospheres

  17. CVD growth control and solar cell application of single-walled carbon nanotubes

    E-Print Network [OSTI]

    Maruyama, Shigeo

    CVD growth control and solar cell application of single-walled carbon nanotubes ( CVD ) #12;#12; Doctoral Dissertation CVD Growth Control and Solar Cell Application of Single is supposed to be a very promising candidate for next-generation solar cell applications. However, three main

  18. A highly efficient (>6%) Cd1xMnxSe quantum dot sensitized solar cell

    E-Print Network [OSTI]

    Cao, Guozhong

    A highly efficient (>6%) Cd1ŔxMnxSe quantum dot sensitized solar cell Jianjun Tian,*a Lili Lv,a Chengbin Fei,b Yajie Wang,b Xiaoguang Liua and Guozhong Cao*bc Quantum dot sensitized solar cells (QDSCs-effective solar cell. The design and synthesis of quantum dots (QDs) for achieving high photoelectric performance

  19. Advancing beyond current generation dye-sensitized solar cells Thomas W. Hamann,ab

    E-Print Network [OSTI]

    Advancing beyond current generation dye-sensitized solar cells Thomas W. Hamann,ab Rebecca A The most efficient dye-sensitized solar cells (DSSCs) have had essentially the same configuration on the fabrication and character- ization of new architectures for dye-sensitized solar cells. He now holds

  20. Spectroscopy of Donor--Acceptor Porphyrins for Dye-Sensitized Solar Cells

    E-Print Network [OSTI]

    Himpsel, Franz J.

    Spectroscopy of Donor--Acceptor Porphyrins for Dye-Sensitized Solar Cells Ioannis Zegkinoglou improvement in the design of dye- sensitized solar cells has been the combination of light- absorbing the energy conversion efficiency. INTRODUCTION Dye-sensitized solar cells (DSSCs) are promising alternatives