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<p>Lead halide perovskites containing organic–inorganic cations are commonly used as absorber materials in high-performance perovskite solar cells. However, these materials are susceptible to degradation under device operational conditions, where illumination and/or bias trigger photo/electrochemical redox reactions that drive halide segregation, ion migration and ultimately perovskite decomposition and device failure. Here we discuss the effect of these photo/electrochemical redox reactions, taking into account not only commonly discussed halide oxidation but also irreversible reactions involving organic cations. We summarize possible oxidation and reduction reactions and outline key degradation pathways of organic cations under illumination and bias, highlighting their critical impact on the long-term stability of perovskite solar cells and the existing gaps in understanding. Finally, we discuss approaches to inhibit these undesirable reactions through organic cation design, additive incorporation and device architecture optimization.</p>

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Irreversible organic cations chemistry limits organic–inorganic halide perovskite stability under illumination or bias

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Zhilin Ren,
  • Stjepan Dolić,
  • Vedran Kojić,
  • Zhengtian Yuan,
  • Pavel Troshin,
  • Andreja Gajović,
  • Jasminka Popović,
  • Aleksandra B. Djurišić

摘要

Lead halide perovskites containing organic–inorganic cations are commonly used as absorber materials in high-performance perovskite solar cells. However, these materials are susceptible to degradation under device operational conditions, where illumination and/or bias trigger photo/electrochemical redox reactions that drive halide segregation, ion migration and ultimately perovskite decomposition and device failure. Here we discuss the effect of these photo/electrochemical redox reactions, taking into account not only commonly discussed halide oxidation but also irreversible reactions involving organic cations. We summarize possible oxidation and reduction reactions and outline key degradation pathways of organic cations under illumination and bias, highlighting their critical impact on the long-term stability of perovskite solar cells and the existing gaps in understanding. Finally, we discuss approaches to inhibit these undesirable reactions through organic cation design, additive incorporation and device architecture optimization.