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Suppression of phase segregation in wide-bandgap perovskites with thiocyanate ions for perovskite/organic tandems with 25.06% efficiency

Author

Listed:
  • Zhichao Zhang

    (Soochow University)

  • Weijie Chen

    (Soochow University)

  • Xingxing Jiang

    (Hunan University)

  • Jianlei Cao

    (Soochow University)

  • Haidi Yang

    (Soochow University)

  • Haiyang Chen

    (Soochow University)

  • Fu Yang

    (Soochow University
    Friedrich-Alexander University Erlangen-Nürnberg)

  • Yunxiu Shen

    (Soochow University)

  • Heyi Yang

    (Soochow University)

  • Qinrong Cheng

    (Soochow University)

  • Xining Chen

    (Soochow University)

  • Xiaohua Tang

    (Soochow University)

  • Shuaiqing Kang

    (Soochow University)

  • Xue-mei Ou

    (Soochow University)

  • Christoph J. Brabec

    (Friedrich-Alexander University Erlangen-Nürnberg
    Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (HI ERN))

  • Yaowen Li

    (Soochow University
    Soochow University
    Soochow University)

  • Yongfang Li

    (Soochow University
    Soochow University
    Chinese Academy of Sciences)

Abstract

Mixed halide wide-bandgap perovskites are suitable for integration in tandem photovoltaics such as perovskite/organic tandem solar cells. However, halide phase segregation originating from halogen vacancy-assisted ion migration in wide-bandgap perovskites limits the device efficiency and lifetime. Here we incorporate pseudo-halogen thiocyanate (SCN) ions in iodide/bromide mixed halide perovskites and show that they enhance crystallization and reduce grain boundaries. Trace amount of SCN ions in the bulk enter the perovskite lattice, forming an I/Br/SCN alloy, and occupy iodine vacancies, blocking halide ion migration via steric hindrance. Taken together, these effects retard halide phase segregation under operation and reduce energy loss in the wide-bandgap perovskite cells. The resulting perovskite/organic tandem solar cell achieves a power conversion efficiency of 25.82% (certified 25.06%) and an operational stability of 1,000 h.

Suggested Citation

  • Zhichao Zhang & Weijie Chen & Xingxing Jiang & Jianlei Cao & Haidi Yang & Haiyang Chen & Fu Yang & Yunxiu Shen & Heyi Yang & Qinrong Cheng & Xining Chen & Xiaohua Tang & Shuaiqing Kang & Xue-mei Ou & , 2024. "Suppression of phase segregation in wide-bandgap perovskites with thiocyanate ions for perovskite/organic tandems with 25.06% efficiency," Nature Energy, Nature, vol. 9(5), pages 592-601, May.
    • Handle: RePEc:nat:natene:v:9:y:2024:i:5:d:10.1038_s41560-024-01491-0
    DOI: 10.1038/s41560-024-01491-0
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