化学
卤化物
钙钛矿(结构)
分解
降级(电信)
水分
相对湿度
氧气
动力学
光化学
光伏
无机化学
热力学
光伏系统
电信
生态学
物理
有机化学
量子力学
生物
计算机科学
结晶学
作者
Timothy D. Siegler,Wiley A. Dunlap-Shohl,Yuhuan Meng,Yuhang Yang,Wylie Kau,Preetham Sunkari,Chang En Tsai,Zachary Armstrong,Yu‐Chia Chen,David A. C. Beck,Marina Meilӑ,Hugh W. Hillhouse
摘要
Halide perovskites have the potential to disrupt the photovoltaics market based on their high performance and low cost. However, the decomposition of perovskites under moisture, oxygen, and light raises concerns about service lifetime, especially because degradation mechanisms and the corresponding rate laws that fit the observed data have thus far eluded researchers. Here, we report a water-accelerated photooxidation mechanism dominating the degradation kinetics of archetypal perovskite CH3NH3PbI3 in air under >1% relative humidity at 25 °C. From this mechanism, we develop a kinetic model that quantitatively predicts the degradation rate as a function of temperature, ambient O2 and H2O levels, and illumination. Because water is a possible product of dry photooxidation, these results highlight the need for encapsulation schemes that rigorously block oxygen ingress, as product water may accumulate beneath the encapsulant and initiate the more rapid water-accelerated photooxidative decomposition.
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