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Superoxide radical derived metal-free spiro-OMeTAD for highly stable perovskite solar cells

Author

Listed:
  • Linfeng Ye

    (Northwestern Polytechnical University
    Shaanxi Joint Laboratory of Graphene (NPU))

  • Jiahao Wu

    (Northwestern Polytechnical University
    Shaanxi Joint Laboratory of Graphene (NPU))

  • Sergio Catalán-Gómez

    (Universidad Politécnica de Madrid)

  • Li Yuan

    (Northwestern Polytechnical University
    Shaanxi Joint Laboratory of Graphene (NPU))

  • Riming Sun

    (Northwestern Polytechnical University
    Shaanxi Joint Laboratory of Graphene (NPU))

  • Ruihao Chen

    (Northwestern Polytechnical University
    Shaanxi Joint Laboratory of Graphene (NPU))

  • Zhe Liu

    (Northwestern Polytechnical University
    Shaanxi Joint Laboratory of Graphene (NPU))

  • Jose María Ulloa

    (Universidad Politécnica de Madrid)

  • Adrian Hierro

    (Universidad Politécnica de Madrid)

  • Pengfei Guo

    (Northwestern Polytechnical University
    Shaanxi Joint Laboratory of Graphene (NPU)
    Research & Development Institute of Northwestern Polytechnical University in Shenzhen)

  • Yuanyuan Zhou

    (The Hong Kong University of Science and Technology, Clear Water Bay)

  • Hongqiang Wang

    (Northwestern Polytechnical University
    Shaanxi Joint Laboratory of Graphene (NPU))

Abstract

Lithium salt-doped spiro-OMeTAD is widely used as a hole-transport layer (HTL) for high-efficiency n-i-p perovskite solar cells (PSCs), but unfortunately facing awkward instability for commercialization arising from the intrinsic Li+ migration and hygroscopicity. We herein demonstrate a superoxide radicals (•O2−) derived HTL of metal-free spiro-OMeTAD with remarkable capability of avoiding the conventional tedious oxidation treatment in air for highly stable PSCs. Present work explores the employing of variant-valence Eu(TFSI)2 salts that could generate •O2− for facile and adequate pre-oxidation of spiro-OMeTAD, resulting in the HTL with dramatically increased conductivity and work function. Comparing to devices adopting HTL with LiTFSI doping, the •O2−-derived spiro-OMeTAD increases the PSCs efficiency up to 25.45% and 20.76% for 0.05 cm2 active area and 6 × 6 cm2 module, respectively. State-of-art PSCs employing such metal-free HTLs are also demonstrated to show much-improved environmental stability even under harsh conditions, e.g., maintaining over 90% of their initial efficiency after 1000 h of operation at the maximum power point and after 80 light-thermal cycles under simulated low earth orbit conditions, respectively, indicating the potentials of developing metal-free spiro-OMeTAD for low-cost and shortened processing of perovskite photovoltaics.

Suggested Citation

  • Linfeng Ye & Jiahao Wu & Sergio Catalán-Gómez & Li Yuan & Riming Sun & Ruihao Chen & Zhe Liu & Jose María Ulloa & Adrian Hierro & Pengfei Guo & Yuanyuan Zhou & Hongqiang Wang, 2024. "Superoxide radical derived metal-free spiro-OMeTAD for highly stable perovskite solar cells," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52199-4
    DOI: 10.1038/s41467-024-52199-4
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    1. Jaemin Kong & Yongwoo Shin & Jason A. Röhr & Hang Wang & Juan Meng & Yueshen Wu & Adlai Katzenberg & Geunjin Kim & Dong Young Kim & Tai-De Li & Edward Chau & Francisco Antonio & Tana Siboonruang & Soo, 2021. "CO2 doping of organic interlayers for perovskite solar cells," Nature, Nature, vol. 594(7861), pages 51-56, June.
    2. Jaemin Kong & Yongwoo Shin & Jason A. Röhr & Hang Wang & Juan Meng & Yueshen Wu & Adlai Katzenberg & Geunjin Kim & Dong Young Kim & Tai-De Li & Edward Chau & Francisco Antonio & Tana Siboonruang & Soo, 2021. "Author Correction: CO2 doping of organic interlayers for perovskite solar cells," Nature, Nature, vol. 597(7877), pages 12-12, September.
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