Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 22, Pages 7245-7250Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b02972
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Funding
- Natural Sciences and Engineering Research Council of Canada
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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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