The control of film morphology is crucial in achieving high‐performance perovskite solar cells (PSCs). Herein, the crystals of the perovskite films are reconstructed by post‐treating the MAPbI₃ devices with methylamine gas, yielding a homogeneous nucleation and crystallization of the perovskite in the triple mesoscopic inorganic layers structured PSCs. As a result, a uniform, compact, and crystalline perovskite layer is obtained after the methylamine gas post‐treatment, yielding high power conversion efficiency (PCE) of 15.26%, 128.8% higher than that of the device before processing. More importantly, this post‐treatment process allows the regeneration of the photodegraded PSCs via the crystal reconstruction and the PCE can recover to 91% of the initial value after two cycles of the photodegradation‐recovery process. This simple method allows for the regeneration of perovskite solar cells on site without reconstruction or replacing any components, thus prolonging the service life of the perovskite solar cells and distinguishing from any other photovoltaic devices in practice.

中文翻译：

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甲胺气体后处理对钙钛矿太阳能电池的改善和再生

薄膜形态的控制对于实现高性能钙钛矿太阳能电池（PSC）至关重要。在这里，钙钛矿膜的晶体是通过对MAPbI ₃进行后处理而重建的装置具有甲胺气体，可在三层介观无机层结构的PSC中产生钙钛矿的均匀形核和结晶。结果，在甲胺气体后处理后获得了均匀，致密且结晶的钙钛矿层，产生了15.26％的高功率转换效率（PCE），比加工前的器件高128.8％。更重要的是，这种后处理过程允许通过晶体重建来再生光降解的PSC，而PCE可以在两个光降解恢复过程之后恢复到初始值的91％。这种简单的方法可以现场还原钙钛矿型太阳能电池，而无需重建或更换任何组件，