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Antisolvent seeding of self-assembled monolayers for flexible monolithic perovskite/Cu(In,Ga)Se2 tandem solar cells

Author

Listed:
  • Zhiqin Ying

    (Chinese Academy of Sciences (CAS))

  • Shiqian Su

    (Chinese Academy of Sciences (CAS))

  • Xin Li

    (Chinese Academy of Sciences (CAS))

  • Guoxin Chen

    (Chinese Academy of Sciences (CAS))

  • Chongyan Lian

    (Xuancheng Kaisheng New Energy Technology Company Ltd.)

  • Dikai Lu

    (Xuancheng Kaisheng New Energy Technology Company Ltd.)

  • Meili Zhang

    (Chinese Academy of Sciences (CAS))

  • Xuchao Guo

    (Chinese Academy of Sciences (CAS))

  • Hao Tian

    (Chinese Academy of Sciences (CAS))

  • Yihan Sun

    (Chinese Academy of Sciences (CAS))

  • Linhui Liu

    (Chinese Academy of Sciences (CAS))

  • Chuanxiao Xiao

    (Chinese Academy of Sciences (CAS))

  • Yuheng Zeng

    (Chinese Academy of Sciences (CAS))

  • Chao Zhang

    (Tianjin Institute of Power Sources)

  • Xi Yang

    (Chinese Academy of Sciences (CAS))

  • Jichun Ye

    (Chinese Academy of Sciences (CAS))

Abstract

Flexible perovskite/copper indium gallium selenide (CIGS) tandem solar cells hold great promise for lightweight, high-efficiency applications, yet achieving high-quality perovskite top cells on the rough surfaces of flexible CIGS bottom cells remains challenging. Accordingly, we developed an antisolvent-seeding strategy that decouples self-assembly monolayers (SAMs) adsorption from dissolution, while integrating perovskite seeding. A high-polarity solvent prevents SAMs clustering during dissolution, while a low-polarity antisolvent promotes high-density SAMs formation during adsorption. Additionally, a pre-mixed seed layer further improves perovskite wettability, crystallinity and adhesion. These advancements enable the fabrication of a 1.09-cm2 flexible monolithic perovskite/CIGS tandem with a stabilized efficiency of 24.6% (certified 23.8%), comparable to the best-performing rigid perovskite/CIGS tandems and representing one of the highest efficiencies among flexible thin-film solar cells. The flexible devices also demonstrate excellent durability, retaining over 90% of initial performance after 320 h of operation and 3,000 bending cycles at a 1-cm radius.

Suggested Citation

  • Zhiqin Ying & Shiqian Su & Xin Li & Guoxin Chen & Chongyan Lian & Dikai Lu & Meili Zhang & Xuchao Guo & Hao Tian & Yihan Sun & Linhui Liu & Chuanxiao Xiao & Yuheng Zeng & Chao Zhang & Xi Yang & Jichun, 2025. "Antisolvent seeding of self-assembled monolayers for flexible monolithic perovskite/Cu(In,Ga)Se2 tandem solar cells," Nature Energy, Nature, vol. 10(6), pages 737-749, June.
    • Handle: RePEc:nat:natene:v:10:y:2025:i:6:d:10.1038_s41560-025-01760-6
    DOI: 10.1038/s41560-025-01760-6
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