Abstract Inorganic CsPbBr3 perovskite has emerged as a promising material for fabricating highly stable perovskite solar cell devices. However, during the formation of thermally evaporated CsPbBr3 film, an all-solid reaction between CsBr and PbBr2 leads to non-uniform interfaces and high defect density in the perovskite film. In this work, we utilize a two-step sintering (TSS) method which successfully modifies the morphologies of thermally evaporated CsPbBr3 films and the power conversion efficiency of a champion CsPbBr3 perovskite solar cell achieves 9.35%. Steady-state photoluminescence, time-resolved photoluminescence and space-charge-limited-current results prove that the TSS process can effectively reduce defect densities also. Besides these improvements, the TSS device maintains 94% of initial efficiency after being heated at 100 °C without encapsulation for over 40 days under ambient lab condition. In comparison, the untreated device reduces about 15%. Transmission electron microscope results further prove the reduction of line defects in CsPbBr3 crystals after TSS treatment.

中文翻译：

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高性能热蒸发 CsPbBr3 钙钛矿太阳能电池的通用缺陷消除

摘要 无机 CsPbBr3 钙钛矿已成为制造高度稳定的钙钛矿太阳能电池器件的有前途的材料。然而，在热蒸发 CsPbBr3 薄膜的形成过程中，CsBr 和 PbBr2 之间的全固态反应导致钙钛矿薄膜中的界面不均匀和缺陷密度高。在这项工作中，我们利用两步烧结 (TSS) 方法成功地改变了热蒸发 CsPbBr3 薄膜的形态，并且冠军 CsPbBr3 钙钛矿太阳能电池的功率转换效率达到 9.35%。稳态光致发光、时间分辨光致发光和空间电荷限制电流结果证明 TSS 工艺也可以有效降低缺陷密度。除了这些改进，TSS 器件在环境实验室条件下在 100 °C 下加热超过 40 天后仍保持初始效率的 94%。相比之下，未经处理的设备减少了约 15%。透射电子显微镜结果进一步证明 TSS 处理后 CsPbBr3 晶体中的线缺陷减少。