Liu Kaikai, Luo Yujie, Jin Yongbin, Liu Tianxiao, Liang Yuming, Yang Liu, Song Peiquan, Liu Zhiyong, Tian Chengbo, Xie Liqiang, Wei Zhanhua
Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing, Institute of Luminescent Materials and Information Displays, College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, P.R. China.
Henan Key Laboratory of Photovoltaic Materials, School of Physics, Henan Normal University, Xinxiang, 453007, P.R. China.
Nat Commun. 2022 Aug 19;13(1):4891. doi: 10.1038/s41467-022-32482-y.
Understanding the function of moisture on perovskite is challenging since the random environmental moisture strongly disturbs the perovskite structure. Here, we develop various N-protected characterization techniques to comprehensively study the effect of moisture on the efficient cesium, methylammonium, and formamidinium triple-cation perovskite (CsFAMA)Pb(IBr). In contrast to the secondary measurements, the established air-exposure-free techniques allow us directly monitor the influence of moisture during perovskite crystallization. We find a controllable moisture treatment for the intermediate perovskite can promote the mass transportation of organic salts, and help them enter the buried bottom of the films. This process accelerates the quasi-solid-solid reaction between organic salts and PbI, enables a spatially homogeneous intermediate phase, and translates to high-quality perovskites with much-suppressed defects. Consequently, we obtain a champion device efficiency of approaching 24% with negligible hysteresis. The devices exhibit an average T-lifetime of 852 h (maximum 1210 h) working at the maximum power point.
由于随机的环境湿度会强烈干扰钙钛矿结构，了解湿度对钙钛矿的作用具有挑战性。在此，我们开发了各种N保护表征技术，以全面研究湿度对高效铯、甲基铵和甲脒三阳离子钙钛矿（CsFAMA）Pb(IBr)的影响。与二次测量不同，已建立的无空气暴露技术使我们能够直接监测钙钛矿结晶过程中湿度的影响。我们发现，对中间相钙钛矿进行可控的湿度处理可以促进有机盐的质量传输，并帮助它们进入薄膜的埋底层。这一过程加速了有机盐与PbI之间的准固-固反应，形成了空间均匀的中间相，并转化为具有大大抑制缺陷的高质量钙钛矿。因此，我们获得了接近24%的冠军器件效率，滞后现象可忽略不计。这些器件在最大功率点工作时的平均T寿命为852小时（最长1210小时）。
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