Progress in Photovoltaics: Research and Applications

Cover image for Vol. 19 Issue 1

January 2011

Volume 19, Issue 1

Pages 1–126

  1. Research Articles

    1. Top of page
    2. Research Articles
    3. Research: Short Communication: Accelerated Publications
    4. Research: Short Communications
    5. Applications
    6. Literature Surveys
    1. The effects of spectral evaluation of c-Si modules (pages 1–10)

      Michael Simon and Edson L. Meyer

      Article first published online: 14 JUL 2010 | DOI: 10.1002/pip.973

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      The concept of Weighted Useful Fraction (WUF) has been used to evaluate the effect of outdoor spectrum on crystalline module. The figure illustrates typical seasonal WUF profile against time.

      For mc-Si modules, it was observed that WUF in summer peaks at 10h30 at a value of 0.8099 corresponding to an AM = 2.19, different from AM1.5 expected at solar noon, 12h30. The WUF was found to peak at 13h00 at a value of 0.7125, corresponding to AM1.83 during winter seasons.

    2. Comparison of indoor and outdoor performance measurements of recent commercially available solar modules (pages 11–20)

      A. Virtuani, H. Müllejans and E. D. Dunlop

      Article first published online: 29 APR 2010 | DOI: 10.1002/pip.977

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      The strong growth of the PV market is accompanied by an increasing number of “new” PV technologies now mature for commercialization. A correct calibration of these devices is in some cases very difficult, because indoor and outdoor performance measurements often lead to different results. In this work we compare the indoor and outdoor performance measurements of a set of recent commercially available PV modules. The major effects which lead to discrepancies between measurements are identified, as follows: (a) spectral mismatch errors; (b) measurement-related sweep-time effects, and (c) short-time light soaking effects.

    3. Drift-diffusion model for intermediate band solar cells including photofilling effects (pages 21–32)

      Rune Strandberg and Turid Worren Reenaas

      Article first published online: 14 MAY 2010 | DOI: 10.1002/pip.983

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      A new mathematical model for the Intermediate Band Solar Cell that allows the carriers in all three bands to vary spatially is presented. It is investigated how illumination and material properties affects the carrier profiles and cell performance. Band diagrams, optimal IB-filling and the optimal thickness of the field-damping layers are also discussed.

    4. Neural network-based model for dual-junction solar cells (pages 33–44)

      Jagdish C. Patra

      Article first published online: 24 MAY 2010 | DOI: 10.1002/pip.985

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      In this paper we have provided a novel neural network (NN)-based technique to model dualjunction (DJ) solar cells. With extensive computer simulations we have shown the effectiveness of the NN-based model and demonstrated its superior performance over the device simulator ATLAS in terms of accuracy of prediction of DJ solar cell parameters.

    5. Investigation of bulk and solar cell properties of ingots cast from compensated solar grade silicon (pages 45–53)

      Chiara Modanese, Marisa Di Sabatino, Anne-Karin Søiland, Kristian Peter and Lars Arnberg

      Article first published online: 14 MAY 2010 | DOI: 10.1002/pip.986

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      The effect of concurrent presence of B and P on bulk- and solar cell properties of directionally solidified multicrystalline ingots from commercial, compensated solar grade silicon feedstock was investigated. Solar cells made from the compensated ingots and processed under standard process conditions show efficiency values up to 15.5% and fill factor values up to 78%, comparable to conventional multicrystalline silicon cells.

    6. Investigations on the temperature dependence of CPV modules equipped with triple-junction solar cells (pages 54–60)

      Gerhard Peharz, Juan P. Ferrer Rodríguez, Gerald Siefer and Andreas W. Bett

      Article first published online: 10 JUN 2010 | DOI: 10.1002/pip.987

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      A method for the investigation of temperature influences on CPV modules is presented. The electrical parameters of three FLATCON® type CPV modules are investigated using a sun simulator, where the module temperatures are varied by heating with infrared bulbs. It is found that all electrical parameters vary linearly to a change of temperature.

    7. Four-junction spectral beam-splitting photovoltaic receiver with high optical efficiency (pages 61–72)

      Bernhard Mitchell, Gerhard Peharz, Gerald Siefer, Marius Peters, Tobias Gandy, Jan Christoph Goldschmidt, Jan Benick, Stefan W. Glunz, Andreas W. Bett and Frank Dimroth

      Article first published online: 14 JUL 2010 | DOI: 10.1002/pip.988

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      A photovoltaic receiver using the geometry of a 45°-parallelepiped to realize a light trapping, spectral beam-splitting architecture that includes three solar cells and two beam-splitters is presented. The receiver splits the solar spectrum into smaller energy parts and converts each of these parts with a solar cell of an appropriate band gap. The paper discusses band gap engineering, optical design and shows extended characterization data of the receiver including the used beam splitters and solar cells.

    8. Validated front contact grid simulation for GaAs solar cells under concentrated sunlight (pages 73–83)

      Marc Steiner, Simon P. Philipps, Martin Hermle, Andreas W. Bett and Frank Dimroth

      Article first published online: 24 MAY 2010 | DOI: 10.1002/pip.989

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      The validated network simulation model allows determining the optimum size and concentration ratio at which a solar cell operates at its maximum efficiency. In the case of a GaAs single-junction solar cell this global efficiency maximum was found for an area of 1 mm2 and at a concentration ratio of 450 suns. Under these conditions the largest loss mechanisms are the finger shading with 36.1 % and the emitter resistance losses with 21.5 % of the total power losses.

  2. Research: Short Communication: Accelerated Publications

    1. Top of page
    2. Research Articles
    3. Research: Short Communication: Accelerated Publications
    4. Research: Short Communications
    5. Applications
    6. Literature Surveys
    1. You have free access to this content
      Solar cell efficiency tables (version 37) (pages 84–92)

      Martin A. Green, Keith Emery, Yoshihiro Hishikawa and Wilhelm Warta

      Article first published online: 28 DEC 2010 | DOI: 10.1002/pip.1088

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      Consolidated tables showing an extensive listing of the highest independently confirmed efficiencies for solar cells and modules are presented. Guidelines for inclusion of results into these tables are outlined and new entries since June 2010 are reviewed.

  3. Research: Short Communications

    1. Top of page
    2. Research Articles
    3. Research: Short Communication: Accelerated Publications
    4. Research: Short Communications
    5. Applications
    6. Literature Surveys
    1. You have free access to this content
      Cu2ZnSnS4 thin film solar cells by fast coevaporation (pages 93–96)

      Björn-Arvid Schubert, Björn Marsen, Sonja Cinque, Thomas Unold, Reiner Klenk, Susan Schorr and Hans-Werner Schock

      Article first published online: 31 MAY 2010 | DOI: 10.1002/pip.976

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      Searching for alternatives not containing indium, the Cu(In,Ga)(S,Se)2 related thin-film material Cu2ZnSnS4 (CZTS) consisting of abundant materials is investigated. Near-stoichiometric single-phased polycrystalline CZTS layers are prepared by a fast coevaporation process under copper-rich growth conditions and subsequent KCN etch which removes the CuS secondary phase. A CZTS/CdS/ZnO solar cell device based on such an absorber layer shows an open-circuit voltage of 541 mV, short-circuit current density of 13.0 mA/cm2, and efficiency of 4.1%.

  4. Applications

    1. Top of page
    2. Research Articles
    3. Research: Short Communication: Accelerated Publications
    4. Research: Short Communications
    5. Applications
    6. Literature Surveys
    1. You have free access to this content
      A self-calibrating led-based solar test platform (pages 97–112)

      Frederik C. Krebs, Kristian O. Sylvester-Hvid and Mikkel Jørgensen

      Article first published online: 11 MAR 2010 | DOI: 10.1002/pip.963

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      A compact solar test platform that comprises a self calibrating high intensity multiwavelength LED array with up to 30 sun equivalents at some wavelengths and up to 3 suns under synthesized AM1.5G. The lamp was built for the field of polymer and organic solar cells to enable identical and reproducible measurement conditions in different laboratories. PCE, IPCE, inverse IPCE, light biased IPCE, saturation and stability can be studied under controlled atmosphere for normal and inverted devices using top and bottom contacting.

    2. You have free access to this content
      Real-time reliability test for a CPV module based on a power degradation model (pages 113–122)

      J.R. González, M. Vázquez, C. Algora and N. Núñez

      Article first published online: 4 AUG 2010 | DOI: 10.1002/pip.991

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      This paper presents a procedure for assessing the reliability of concentrator photovoltaic modules operating outdoors in real-time conditions. With this model, the main reliability functions are predicted. This model has been applied to a real case.

  5. Literature Surveys

    1. Top of page
    2. Research Articles
    3. Research: Short Communication: Accelerated Publications
    4. Research: Short Communications
    5. Applications
    6. Literature Surveys

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