Journal
ACS NANO
Volume 9, Issue 2, Pages 1955-1963Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn506864k
Keywords
perovskites; relative humidity; moisture; decomposition; GIXRD
Categories
Funding
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Saskatchewan
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- NSERC
- Canada Research Chair program
- Inorganic Chemistry Exchange (ICE) program
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Perovskite solar cells have rapidly advanced to the forefront of solution-processable photovoltaic devices, but the CH3NH3PbI3 semiconductor decomposes rapidly in moist air, limiting their commercial utility. In this work, we report a quantitative and systematic investigation of perovskite degradation processes. By carefully controlling the relative humidity of an environmental chamber and using in situ absorption spectroscopy and in situ grazing incidence X-ray diffraction to monitor phase changes in perovskite degradation process, we demonstrate the formation of a hydrated intermediate containing isolated PbI64- octahedra as the first step of the degradation mechanism. We also show that the identity of the hole transport layer can have a dramatic impact on the stability of the underlying perovskite film, suggesting a route toward perovskite solar cells with long device lifetimes and a resistance to humidity.
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