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Non-Hydrazine Solutions in Processing CuIn(S,Se)2 Photovoltaic Devices from Hydrazinium Precursors

Authors

  • Huanping Zhou,

    1. Department of Materials Science and Engineering, California NanosSystem Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
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  • Chia-Jung Hsu,

    1. Department of Materials Science and Engineering, California NanosSystem Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
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  • Wan-Ching Hsu,

    1. Department of Materials Science and Engineering, California NanosSystem Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
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  • Hsin-Sheng Duan,

    1. Department of Materials Science and Engineering, California NanosSystem Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
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  • Choong-Heui Chung,

    1. Department of Materials Science and Engineering, California NanosSystem Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
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  • Wenbing Yang,

    1. Department of Materials Science and Engineering, California NanosSystem Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
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  • Yang Yang

    Corresponding author
    1. Department of Materials Science and Engineering, California NanosSystem Institute, University of California Los Angeles, Los Angeles, CA 90095, USA
    • Department of Materials Science and Engineering, California NanosSystem Institute, University of California Los Angeles, Los Angeles, CA 90095, USA.
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Abstract

We report an approach for the fabrication of CuIn(S,Se)2-based photovoltaic devices from hydrazinium precursors in non-hydrazine solvents, specifically a ethanolamine/dimethyl sulfoxide (EA/DMSO) mixture. For the first time, both Cu hydrazinium precursor and Cu-In hydrazinium precursor are found with good solubility in non-hydrazine solvents, producing molecular-level blending of metal precursors. Sulfur loss in Cu hydrazinium precursor is compensated for by either introduction of excessive S/Se or the formation of S/Se-bridged Cu-In compounds. The success of dissolving Cu-In hydrazinium precursor is ascribed to the coordinated S group and strong intramolecular interaction within non-hydrazine solvents. X-ray diffraction (XRD) and Raman characterization indicate the formation of the CuIn(S,Se)2 phase after annealing. Through introducing different amounts of excess S/Se, the ratio between CuInS2 and CuInSe2, as well as the morphology of the resulted CuIn(S,Se)2 film can be controlled. Optimized devices exhibit a power conversion efficiency of 3.8% with a CISS absorber layer of only around 300 nm thickness, which is comparable to N2H4-based devices of similar thickness.

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