Journal article
Phase segregation in mixed-halide perovskites affects charge-carrier dynamics while preserving mobility
- Abstract:
- Mixed halide perovskites can provide optimal bandgaps for tandem solar cells which are key to improved cost-efficiencies, but can still suffer from detrimental illumination-induced phase segregation. Here we employ optical-pump terahertz-probe spectroscopy to investigate the impact of halide segregation on the charge-carrier dynamics and transport properties of mixed halide perovskite films. We reveal that, surprisingly, halide segregation results in negligible impact to the THz charge-carrier mobilities, and that charge carriers within the I-rich phase are not strongly localised. We further demonstrate enhanced lattice anharmonicity in the segregated I-rich domains, which is likely to support ionic migration. These phonon anharmonicity effects also serve as evidence of a remarkably fast, picosecond charge funnelling into the narrow-bandgap I-rich domains. Our analysis demonstrates how minimal structural transformations during phase segregation have a dramatic effect on the charge-carrier dynamics as a result of charge funnelling. We suggest that because such enhanced recombination is radiative, performance losses may be mitigated by deployment of careful light management strategies in solar cells.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, 2.3MB, Terms of use)
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- Publisher copy:
- 10.1038/s41467-021-26930-4
Authors
- Publisher:
- Springer Nature
- Journal:
- Nature Communications More from this journal
- Volume:
- 12
- Article number:
- 6955
- Place of publication:
- England
- Publication date:
- 2021-11-29
- Acceptance date:
- 2021-10-26
- DOI:
- EISSN:
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2041-1723
- Pmid:
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34845219
- Language:
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English
- Keywords:
- Pubs id:
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1214171
- Local pid:
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pubs:1214171
- Deposit date:
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2022-01-17
Terms of use
- Copyright holder:
- Motti et al.
- Copyright date:
- 2021
- Rights statement:
- ©2021 The Author(s). Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
- Licence:
- CC Attribution (CC BY)
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