Reduced Barrier for Ion Migration in Mixed-Halide Perovskites.
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Authors
Schmidt, Moritz C
Publication Date
2021-12-27Journal Title
ACS Appl Energy Mater
ISSN
2574-0962
Publisher
American Chemical Society (ACS)
Volume
4
Issue
12
Pages
13431-13437
Language
eng
Type
Article
This Version
VoR
Metadata
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McGovern, L., Grimaldi, G., Futscher, M. H., Hutter, E. M., Muscarella, L. A., Schmidt, M. C., & Ehrler, B. (2021). Reduced Barrier for Ion Migration in Mixed-Halide Perovskites.. ACS Appl Energy Mater, 4 (12), 13431-13437. https://doi.org/10.1021/acsaem.1c03095
Abstract
Halide alloying in metal halide perovskites is a useful tool for optoelectronic applications requiring a specific bandgap. However, mixed-halide perovskites show ion migration in the perovskite layer, leading to phase segregation and reducing the long-term stability of the devices. Here, we study the ion migration process in methylammonium-based mixed-halide perovskites with varying ratios of bromide to iodide. We find that the mixed-halide perovskites show two separate halide migration processes, in contrast to pure-phase perovskites, which show only a unique halide migration component. Compared to pure-halide perovskites, these processes have lower activation energies, facilitating ion migration in mixed versus pure-phase perovskites, and have a higher density of mobile ions. Under illumination, we find that the concentration of mobile halide ions is further increased and notice the emergence of a migration process involving methylammonium cations. Quantifying the ion migration processes in mixed-halide perovskites shines light on the key parameters allowing the design of bandgap-tunable perovskite solar cells with long-term stability.
Sponsorship
Engineering and Physical Sciences Research Council (EP/S030638/1)
Identifiers
34977472, PMC8715422
External DOI: https://doi.org/10.1021/acsaem.1c03095
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333587
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: https://creativecommons.org/licenses/by-nc-nd/4.0/
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