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<p>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.</p>

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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月29日

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  • Liming Du,
  • Fangfang Cao,
  • Rui Meng,
  • Yueying Zhang,
  • Junchuan Zhang,
  • Zhiyu Gao,
  • Cong Chen,
  • Can Li,
  • Dewei Zhao,
  • Jichun Ye,
  • Zhen Li,
  • Chuanxiao Xiao

摘要

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.