In halide perovskite solar cells the formation of secondary-phase excess lead iodide (PbI 2 ) has some positive effects on power conversion efficiency (PCE) but can be detrimental to device stability and lead to large hysteresis effects in voltage sweeps. We converted PbI 2 into an inactive (PbI 2 ) 2 RbCl compound by RbCl doping, which effectively stabilizes the perovskite phase. We obtained a certified PCE of 25.6% for FAPbI 3 (FA, formamidinium) perovskite solar cells on the basis of this strategy. Devices retained 96% of their original PCE values after 1000 hours of shelf storage and 80% after 500 hours of thermal stability testing at 85°C.

中文翻译：

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非活性 (PbI 2 ) 2 RbCl 稳定钙钛矿薄膜，用于高效太阳能电池

在卤化物钙钛矿太阳能电池中形成第二相过量碘化铅（PbI2) 对功率转换效率 (PCE) 有一些积极影响，但可能不利于器件稳定性并导致电压扫描中的大滞后效应。我们转换了 PbI2进入非活动状态（PbI2)2通过 RbCl 掺杂的 RbCl 化合物，有效地稳定了钙钛矿相。我们为 FAPbI 获得了 25.6% 的认证 PCE3（FA，formamidinium）钙钛矿太阳能电池就是基于这种策略。设备在 85°C 的货架存储 1000 小时后保持其原始 PCE 值的 96%，在 85°C 下进行 500 小时热稳定性测试后保持 80%。