Solar cells based on metal halide perovskites have reached a power conversion efficiency as high as 25%. Their booming efficiency, feasible processability, and good compatibility with large‐scale deposition techniques make perovskite solar cells (PSCs) desirable candidates for next‐generation photovoltaic devices. Despite these advantages, the lifespans of solar cells are far below the industry‐needed 25 years. In fact, numerous PSCs throughout the literature show severely hampered stability under illumination. Herein, several photoinduced degradation mechanisms are discussed. With light radiation, the organic–inorgainc perovskites are prone to phase segregation or chemical decomposition; the oxide electron transport layers (ETLs) tend to introduce new defects at the interface; the commonly used small molecules‐based hole transport layers (HTLs) typically suffer from poor photostability and dopant diffusion during device operation. It has been demonstrated the photoinduced degradation can take place in every functional layer, including the active layer, ETL, HTL, and their interfaces. An overview of these degradation categories is provided in this review, in the hope of encouraging further research and optimization of relevant devices.

中文翻译：

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钙钛矿太阳能电池中光诱导降解的机理和抑制

基于金属卤化物钙钛矿的太阳能电池的功率转换效率高达25％。它们的蓬勃发展的效率，可行的加工性能以及与大规模沉积技术的良好兼容性，使钙钛矿太阳能电池（PSC）成为下一代光伏设备的理想之选。尽管具有这些优点，但太阳能电池的寿命仍远远低于行业所需的25年。实际上，整个文献中的许多PSC在光照下都表现出严重的稳定性问题。在此，讨论了几种光致降解机理。在光辐射下，有机-无机钙钛矿易相分离或化学分解。氧化物电子传输层（ETL）倾向于在界面处引入新的缺陷。常用的基于小分子的空穴传输层（HTL）通常在设备运行期间遭受光稳定性和掺杂剂扩散的影响。已经证明光诱导的降解可发生在每个功能层中，包括活性层，ETL，HTL及其界面。这篇综述提供了这些降解类别的概述，以期鼓励对相关设备进行进一步的研究和优化。