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Photo-homogenization assisted segregation easing technique (PHASET) for highly efficient and stable wide-bandgap perovskite solar cells

Author

Listed:
  • Liming Du

    (Northwestern Polytechnical University
    Northwestern Polytechnical University)

  • Fangfang Cao

    (Chinese Academy of Sciences)

  • Rui Meng

    (Northwestern Polytechnical University
    Northwestern Polytechnical University)

  • Yueying Zhang

    (Chinese Academy of Sciences)

  • Junchuan Zhang

    (Chinese Academy of Sciences)

  • Zhiyu Gao

    (Ministry of Education, Sichuan University)

  • Cong Chen

    (Ministry of Education, Sichuan University)

  • Can Li

    (Northwestern Polytechnical University
    Northwestern Polytechnical University)

  • Dewei Zhao

    (Ministry of Education, Sichuan University)

  • Jichun Ye

    (Chinese Academy of Sciences)

  • Zhen Li

    (Northwestern Polytechnical University
    Northwestern Polytechnical University)

  • Chuanxiao Xiao

    (Chinese Academy of Sciences
    Ningbo New Materials Testing and Evaluation Center CO. Ltd)

Abstract

Wide-bandgap (WBG) perovskite solar cells (PSCs) can exceed the Shockley–Queisser limit in tandem solar cells (TSCs), but phase segregation under continuous illumination limits their stability. Using in-situ microscopic characterizations, we investigate the dynamics of photon-induced phase segregation. Initial light soaking drives iodide diffusion into a metastable state, but continued redistribution increases the phase separation energy barrier, resulting in a more stable, segregation-resistant state. Inspired by stabilization methods in silicon photovoltaics, we develop the Photo-Homogenization Assisted Segregation Easing Technique (PHASET), which combines light soaking with 2-ThEABr surface passivation to suppress halide segregation. PHASET enhances efficiency and stability, enabling an efficiency of 20.23% for 1.79 eV WBG-PSCs, with 97% of the initial efficiency retained after 1200 hours of continuous illumination. Integration with a 1.25 eV narrow-bandgap subcell results in a two-terminal all-perovskite TSC with 28.64% efficiency, retaining 77% of its initial performance after 1200 hours of maximum power point tracking.

Suggested Citation

  • Liming Du & Fangfang Cao & Rui Meng & Yueying Zhang & Junchuan Zhang & Zhiyu Gao & Cong Chen & Can Li & Dewei Zhao & Jichun Ye & Zhen Li & Chuanxiao Xiao, 2025. "Photo-homogenization assisted segregation easing technique (PHASET) for highly efficient and stable wide-bandgap perovskite solar cells," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-63176-w
    DOI: 10.1038/s41467-025-63176-w
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