The inverted perovskite solar cells have drawn considerable attention owing to their low cost, good compatibility, and easy production processes. However, the device performance is still limited by some important factors, such as surface imperfections and interfacial nonradiative recombination losses. Here, N-acetylethylenediamine (N-AE) is introduced to bind to the surface of the perovskite film via an ammonia condensation reaction. This process creates a stable interfacial layer with n-type doping to enhance the open-circuit voltage (V_OC). Moreover, during post-treatment, N-AE dissolves a portion of the perovskite on the surface, leading to perovskite recrystallization. This process enhances the surface quality of the perovskite film and reduces nonradiative recombination. As a result, the inverted perovskite solar cell exhibits a power conversion efficiency approaching 20%, with a rise in V_OC from 0.96 to 1.05 V. More impressively, the unencapsulated devices display excellent stability at 85 °C annealing and retained 88% of the initial PCE for 816 h.

中文翻译：

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通过伯胺分子反应提高倒置钙钛矿太阳能电池的效率和稳定性

倒置钙钛矿太阳能电池因其成本低、兼容性好、生产工艺简单而受到广泛关注。然而，器件性能仍然受到一些重要因素的限制，例如表面缺陷和界面非辐射复合损失。在这里，引入N-乙酰基乙二胺（N-AE）通过氨缩合反应结合到钙钛矿薄膜的表面。该工艺通过 n 型掺杂创建稳定的界面层，以提高开路电压 ( _VOC )。此外，在后处理过程中，N-AE溶解了表面的部分钙钛矿，导致钙钛矿重结晶。该过程提高了钙钛矿薄膜的表面质量并减少了非辐射复合。结果，倒置钙钛矿太阳能电池的功率转换效率接近20％，VOC从0.96V上升到1.05V。更令人印象深刻的是，未封装的器件在85℃退火时表现出优异的稳定性，并保留了88％的性能_。初始 PCE 为 816 小时。