Understanding the Stability of MAPbBr3 versus MAPbI3: Suppression of Methylammonium Migration and Reduction of Halide Migration
Open Access
- 7 August 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 11 (17), 7127-7132
- https://doi.org/10.1021/acs.jpclett.0c01822
Abstract
Solar cells based on metal halide perovskites often show excellent efficiency but poor stability. This degradation of perovskites devices has been associated with the migration of mobile ions. MAPbBr3 perovskite materials are significantly more stable under ambient conditions than MAPbI3. In this work we use Transient Ion Drift (TID) to quantify the key characteristics of ion migration in MAPbBr3 perovskite solar cells. We then proceed to compare them with those of MAPbI3. We find that in MAPbBr3, bromide migration is the main process at play, and that contrary to the case of MAPbI3, there is no evidence for methylammonium migration. Quantitatively, we find a reduced activation energy, reduced diffusion coefficient, and reduced concentration for halide ions in MAPbBr3 compared to MAPbI3. Understanding this difference in the mobile ion migration is a crucial step in understanding the enhanced stability of MAPbBr3 versus MAPbI3.Keywords
Funding Information
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (016.Vidi.179.005, 15PR3202)
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