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Back Contact Engineering to Improve CZTSSe Solar Cell Performance by Inserting MoO 3 Sacrificial Nanolayers

Author

Listed:
  • Cheng-Ying Chen

    (Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung City 202301, Taiwan
    Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
    These authors contributed equally to this work.)

  • Septia Kholimatussadiah

    (Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
    Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
    Department of Physics, National Taiwan University, Taipei 10617, Taiwan
    Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei 115, Taiwan)

  • Wei-Chao Chen

    (Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
    Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan)

  • Yi-Rung Lin

    (Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
    Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
    Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan)

  • Jia-Wei Lin

    (Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
    Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
    Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan)

  • Po-Tuan Chen

    (Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
    Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
    Department of Vehicle Engineering, National Taipei University of Technology, Taipei 10608, Taiwan)

  • Ruei-San Chen

    (Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10617, Taiwan)

  • Kuei-Hsien Chen

    (Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
    Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan)

  • Li-Chyong Chen

    (Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
    Center of Atomic Initiative for New Materials, National Taiwan University, Taipei 10617, Taiwan
    Department of Physics, National Taiwan University, Taipei 10617, Taiwan)

Abstract

Earth-abundant Cu 2 ZnSn(S,Se) 4 (CZTSSe) is a promising nontoxic alternative compound for commercially available Cu(In,Ga)(S,Se) 2 thin-film solar cells. In this study, a MoO 3 nanolayer was applied as a sacrificial layer to optimize the quality of the interface between the CZTSSe and Mo back contact. MoO 3 nanolayers can greatly improve CZTSSe grain growth and suppress the formation of some harmful secondary phases, especially the undesirable MoS(e) 2 . In terms of device performance, the series resistance was reduced from 1.83 to 1.54 Ω·cm 2 , and the fill factor was significantly enhanced from 42.67% to 52.12%. Additionally, MoO 3 nanolayers improved CZTSSe absorber quality by lowering the defect energy levels from 228 to 148 meV. Furthermore, first-principles calculations demonstrate that the partial sulfoselenized MoO 3 nanolayers may function as the ( p -type) hole-selective contacts at Mo/CZTSSe interfaces, leading to an overall improvement in device performance. Lastly, a CZTSSe solar cell with about 26% improvement (compared with reference cells) in power conversion efficiency was achieved by inserting 5 nm MoO 3 sacrificial layers.

Suggested Citation

  • Cheng-Ying Chen & Septia Kholimatussadiah & Wei-Chao Chen & Yi-Rung Lin & Jia-Wei Lin & Po-Tuan Chen & Ruei-San Chen & Kuei-Hsien Chen & Li-Chyong Chen, 2022. "Back Contact Engineering to Improve CZTSSe Solar Cell Performance by Inserting MoO 3 Sacrificial Nanolayers," Sustainability, MDPI, vol. 14(15), pages 1-11, August.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:15:p:9511-:d:879145
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    References listed on IDEAS

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    1. Declan Butler, 2008. "Thin films: ready for their close-up?," Nature, Nature, vol. 454(7204), pages 558-559, July.
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