Publication date: 25th September 2020
A major hurdle for commercialization of perovskite solar cells remains, the degradation of this class of materials under a range of environmental factors. Ion migration has been identified as one of the main drivers for degradation, decreasing the power conversion efficiency of the devices over time.
It was shown that MAPbBr3 is more stable under environmental conditions when compared to MAPbI3. Using transient ion drift, we show that this stems from key changes in ion migration when going from MAPbI3 to MAPbBr3: methylammonium migration is suppressed, while bromide migration is reduced. Composition engineering can thus be used as a tool to mitigate ion migration. We extend our investigation to the evolution of ion migration in different MAPbBr3 solar cells as a function of the grain size of the active perovskite film. We show that beyond composition engineering, crystallinity can be another effective tool to control ion migration.
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