ORCID Profile
0000-0002-8088-3485
Current Organisation
University of Southampton
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Publisher: Wiley
Date: 05-03-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1EE02650J
Abstract: We identify the limiting factors of wide bandgap metal halide perovskite solar cells. To overcome these losses, we developed an efficient optimisation strategy and outline the necessary steps for the continued development of these perovskites.
Publisher: Springer Science and Business Media LLC
Date: 29-11-2021
DOI: 10.1038/S41467-021-26930-4
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.
Publisher: American Chemical Society (ACS)
Date: 05-05-2022
Publisher: American Chemical Society (ACS)
Date: 09-05-2019
Publisher: American Chemical Society (ACS)
Date: 09-05-2022
Publisher: American Chemical Society (ACS)
Date: 17-04-2020
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Silvia G. Motti.