Abstract Inorganic perovskite solar cell (PSC) has been emerging as one of the most promising photovoltaic technologies for future application due to its excellent thermal stability and high power conversion efficiency (PCE). However, the efficiency of state-of-the-art CsPbIBr2–based PSCs is not satisfactory due to the poor quality of CsPbIBr2 perovskite film. Herein, by combining both substrate preheat treatment (SPT) and NH4PF6 precursor additive engineering, we prepared the high-quality CsPbIBr2 perovskite film featuring full coverage, high crystallinity and large crystal grain size, resulting in improved light harvest and reduced nonradiative charge recombination. With these morphology optimizaitons, the PSCs demonstrate a champion efficiency of 10.1% under 100 mW cm−2 illumination. Moreover, CsPbIBr2-based PSC without encapsulation exhibits excellent moisture stability by showing negligible drop in PCE under 40% relative humidity for 30 days.

中文翻译：

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用于高效 CsPbIBr2 基无机钙钛矿太阳能电池的钙钛矿薄膜的形貌控制

摘要 无机钙钛矿太阳能电池（PSC）由于其优异的热稳定性和高功率转换效率（PCE），已成为未来应用最有前途的光伏技术之一。然而，由于 CsPbIBr2 钙钛矿薄膜的质量差，最先进的基于 CsPbIBr2 的 PSC 的效率并不令人满意。在此，通过结合基板预热处理 (SPT) 和 NH4PF6 前驱体添加剂工程，我们制备了具有全覆盖、高结晶度和大晶粒尺寸的高质量 CsPbIBr2 钙钛矿薄膜，从而改善了光收集并减少了非辐射电荷复合。通过这些形态优化，PSC 在 100 mW cm−2 照明下表现出 10.1% 的冠军效率。而且，