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Reduction of bulk and surface defects in inverted methylammonium- and bromide-free formamidinium perovskite solar cells

Author

Listed:
  • Rui Chen

    (Huazhong University of Science and Technology)

  • Jianan Wang

    (Huazhong University of Science and Technology)

  • Zonghao Liu

    (Huazhong University of Science and Technology
    Optics Valley Laboratory)

  • Fumeng Ren

    (Huazhong University of Science and Technology)

  • Sanwan Liu

    (Huazhong University of Science and Technology)

  • Jing Zhou

    (Huazhong University of Science and Technology)

  • Haixin Wang

    (Huazhong University of Science and Technology)

  • Xin Meng

    (Huazhong University of Science and Technology)

  • Zheng Zhang

    (Huazhong University of Science and Technology)

  • Xinyu Guan

    (Huazhong University of Science and Technology)

  • Wenxi Liang

    (Huazhong University of Science and Technology)

  • Pavel A. Troshin

    (Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences
    Zhengzhou Research Institute of HIT
    Harbin Institute of Technology)

  • Yabing Qi

    (Okinawa Institute of Science and Technology Graduate University (OIST))

  • Liyuan Han

    (Shanghai Jiao Tong University)

  • Wei Chen

    (Huazhong University of Science and Technology
    Optics Valley Laboratory)

Abstract

Power conversion efficiencies of inverted perovskite solar cells (PSCs) based on methylammonium- and bromide-free formamidinium lead triiodide (FAPbI3) perovskites still lag behind PSCs with a regular configuration. Here we improve the quality of both the bulk and surface of FA0.98Cs0.02PbI3 perovskite films to reduce the efficiency gap. First, we use dibutyl sulfoxide, a Lewis base additive, to improve the crystallinity and reduce the defect density and internal residual stress of the perovskite bulk. Then, we treat the surface of the perovskite film with trifluorocarbon-modified phenethylammonium iodide to optimize the energy levels, passivate defects and protect the film against moisture. The inverted PSCs simultaneously achieve 25.1% efficiency (24.5% from the reverse current–voltage scan measured by a third-party institution) and improved stability. The devices maintained 97.4% and 98.2% of their initial power conversion efficiencies after operating under continuous 1-sun air mass 1.5 G illumination for 1,800 h and under damp heat conditions (85 °C and 85% relative humidity) for 1,000 h, respectively.

Suggested Citation

  • Rui Chen & Jianan Wang & Zonghao Liu & Fumeng Ren & Sanwan Liu & Jing Zhou & Haixin Wang & Xin Meng & Zheng Zhang & Xinyu Guan & Wenxi Liang & Pavel A. Troshin & Yabing Qi & Liyuan Han & Wei Chen, 2023. "Reduction of bulk and surface defects in inverted methylammonium- and bromide-free formamidinium perovskite solar cells," Nature Energy, Nature, vol. 8(8), pages 839-849, August.
    • Handle: RePEc:nat:natene:v:8:y:2023:i:8:d:10.1038_s41560-023-01288-7
    DOI: 10.1038/s41560-023-01288-7
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    Cited by:

    1. Yongyan Pan & Jianan Wang & Zhenxing Sun & Jiaqi Zhang & Zheng Zhou & Chenyang Shi & Sanwan Liu & Fumeng Ren & Rui Chen & Yong Cai & Huande Sun & Bin Liu & Zhongyong Zhang & Zhengjing Zhao & Zihe Cai , 2024. "Surface chemical polishing and passivation minimize non-radiative recombination for all-perovskite tandem solar cells," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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