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<p>The long-term stability of polycrystalline perovskite solar cells (PSCs) remains a major hurdle despite their high power conversion efficiencies (PCEs), underscoring the importance of eliminating all potential photodegradation pathways. While efforts have been devoted to address bulk and interfacial defect-induced photodegradation, those correlate to the microscale inter-grain carrier reactions intrinsic to the polycrystalline nature of PSCs remain unsolved. Here we uncover a defect-dependent asymmetric inter-grain recombination pathway that governs photodegradation in mixed-facet PSCs. By resolving the nature and evolution of facet-specific defects for the first time, we reveal that hetero-facet grain boundaries induce non-equilibrium hole accumulation at (111)-facet grain boundaries that unexpectedly accelerates their photodegradation, despite their superior intrinsic photostability. By introducing 3-fluorophenylethylammonium bromide that targets identified formamidinium vacancy defects at the (111)-facet grain boundaries, we homogenize the inter-grain recombination, yielding PSCs with PCEs approaching 26.55% and T90 lifetimes over 2200&#xa0;h under continuous 1-sun illumination.</p>

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Stabilizing high-efficiency perovskite solar cells by homogenizing inter-grain recombination

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月20日

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  • Hengyu Zhang,
  • Bingcheng Yu,
  • Daoyong Zhang,
  • Fuyi Zhou,
  • Yueyuan Gao,
  • Pengjie Hang,
  • Haimeng Xin,
  • Fan Zhang,
  • Jie Jiang,
  • Pok Fung Chan,
  • Yuwei Zhang,
  • Rui Zhou,
  • Xiaolong Ma,
  • Hengkai Zhang,
  • Xinhui Lu,
  • Xuegong Yu,
  • Gang Li,
  • Guang Yang,
  • Zhenyi Ni,
  • Deren Yang

摘要

The long-term stability of polycrystalline perovskite solar cells (PSCs) remains a major hurdle despite their high power conversion efficiencies (PCEs), underscoring the importance of eliminating all potential photodegradation pathways. While efforts have been devoted to address bulk and interfacial defect-induced photodegradation, those correlate to the microscale inter-grain carrier reactions intrinsic to the polycrystalline nature of PSCs remain unsolved. Here we uncover a defect-dependent asymmetric inter-grain recombination pathway that governs photodegradation in mixed-facet PSCs. By resolving the nature and evolution of facet-specific defects for the first time, we reveal that hetero-facet grain boundaries induce non-equilibrium hole accumulation at (111)-facet grain boundaries that unexpectedly accelerates their photodegradation, despite their superior intrinsic photostability. By introducing 3-fluorophenylethylammonium bromide that targets identified formamidinium vacancy defects at the (111)-facet grain boundaries, we homogenize the inter-grain recombination, yielding PSCs with PCEs approaching 26.55% and T90 lifetimes over 2200 h under continuous 1-sun illumination.