降级(电信)
钙钛矿(结构)
氢键
碘化物
化学
无机化学
分解
化学工程
碘化氢
氢
材料科学
光化学
分子
有机化学
电信
工程类
计算机科学
作者
Ryan Taoran Wang,Alex Fan Xu,Jason Yuanzhe Chen,Liteng Yang,Gu Xu,Victoria Jarvis,James F. Britten
标识
DOI:10.1021/acs.jpclett.9b02972
摘要
The moisture instability of organic-inorganic hybrid perovskite solar cells has been a major obstacle to the commercialization, calling for mechanistic understanding of the degradation process, which has been under debate. Here we present a surprising discovery that the degradation is actually reversible, via in situ observation of X-ray diffraction, supported by FTIR and SEM. To isolate the hydrogen bond effect, water was replaced by methanol during the in situ experiment, revealing the decomposition to be initiated by the breakdown of N-H-I hydrogen bonds. This is followed by the step of organic iodide hydrolyzing, which can be inhibited in the neutral environment, making the whole process reversible under variable pH.
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