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Title: Water-Accelerated Photooxidation of CH3NH3PbI3 Perovskite

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.2c00391· OSTI ID:1855599

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.

Research Organization:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
Grant/Contract Number:
EE0008563; EE0009351
OSTI ID:
1855599
Alternate ID(s):
OSTI ID: 1905271
Journal Information:
Journal of the American Chemical Society, Vol. 144, Issue 12; Related Information: Siegler, Timothy D.; Dunlap-Shohl, Wiley A.; Meng, Yuhuan; Yang, Yuhang; Kau, Wylie F.; Sunkari, Preetham P.; et al. (2022): Water-Accelerated Photooxidation of CH3NH3PbI3 Perovskite. ACS Publications. Collection. https://doi.org/10.1021/jacs.2c00391; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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