To understand degradation routes and improve the stability of perovskite solar cells (PSCs), accelerated aging tests are needed. Here, we use elevated temperatures (up to 110 Celsius) to quantify the accelerated degradation of encapsulated CsPbI 3 PSCs under constant illumination. Incorporating a 2D Cs 2 PbI 2 Cl 2 capping layer between the perovskite active layer and hole-transport layer stabilizes the interface while increasing power conversion efficiency of the all-inorganic PSCs from 14.9% to 17.4%. Devices with this 2D capping layer did not degrade at 35 Celsius and required >2100 hours at 110 Celsius under constant illumination to degrade by 20% of their initial efficiency. Degradation acceleration factors based on the observed Arrhenius temperature dependence predict intrinsic lifetimes of 51,000 ± 7,000 hours (>5 years) operating continuously at 35 Celsius.

中文翻译：

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全无机、界面稳定的钙钛矿太阳能电池加速老化

为了了解降解路线并提高钙钛矿太阳能电池 (PSC) 的稳定性，需要进行加速老化测试。在这里，我们使用高温（高达 110 摄氏度）来量化封装 CsPbI 的加速降解3恒定照明下的 PSC。包含 2D Cs2铅2氯2钙钛矿活性层和空穴传输层之间的覆盖层稳定了界面，同时将全无机 PSC 的功率转换效率从 14.9% 提高到 17.4%。具有这种 2D 覆盖层的器件在 35 摄氏度时不会退化，并且需要在 110 摄氏度和恒定光照下超过 2100 小时才能降低其初始效率的 20%。基于观察到的 Arrhenius 温度依赖性的降解加速因子预测在 35 摄氏度下连续运行的内在寿命为 51,000 ± 7,000 小时（> 5 年）。