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Influence of Composition on the Performance of Sintered Cu(In,Ga)Se2 Nanocrystal Thin-Film Photovoltaic Devices

Authors

  • Dr. Vahid A. Akhavan,

    1. Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712 (USA), Fax: (+1) 512-471-7060
    2. Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712 (USA)
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  • Taylor B. Harvey,

    1. Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712 (USA), Fax: (+1) 512-471-7060
    2. Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712 (USA)
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  • C. Jackson Stolle,

    1. Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712 (USA), Fax: (+1) 512-471-7060
    2. Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712 (USA)
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  • Dr. David P. Ostrowski,

    1. Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712 (USA)
    2. Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712 (USA)
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  • Micah S. Glaz,

    1. Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712 (USA)
    2. Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712 (USA)
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  • Dr. Brian W. Goodfellow,

    1. Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712 (USA), Fax: (+1) 512-471-7060
    2. Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712 (USA)
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  • Dr. Matthew G. Panthani,

    1. Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712 (USA), Fax: (+1) 512-471-7060
    2. Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712 (USA)
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  • Dariya K. Reid,

    1. Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712 (USA), Fax: (+1) 512-471-7060
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  • Prof. David A. Vanden Bout,

    1. Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712 (USA)
    2. Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712 (USA)
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  • Prof. Brian A. Korgel

    Corresponding author
    1. Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712 (USA), Fax: (+1) 512-471-7060
    2. Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712 (USA)
    • Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712 (USA), Fax: (+1) 512-471-7060
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Abstract

Thin-film photovoltaic devices (PVs) were prepared by selenization using oleylamine-capped Cu(In,Ga)Se2 (CIGS) nanocrystals sintered at a high temperature (>500 °C) under Se vapor. The device performance varied significantly with [Ga]/[In+Ga] content in the nanocrystals. The highest power conversion efficiency (PCE) observed in the devices studied was 5.1 % under air mass 1.5 global (AM 1.5 G) illumination, obtained with [Ga]/[In+Ga]=0.32. The variation in PCE with composition is partly a result of bandgap tuning and optimization, but the main influence of nanocrystal composition appeared to be on the quality of the sintered films. The [Cu]/[In+Ga] content was found to be strongly influenced by the [Ga]/[In+Ga] concentration, which appears to be correlated with the morphology of the sintered film. For this reason, only small changes in the [Ga]/[In+Ga] content resulted in significant variations in device efficiency.

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