ORCID Profile
0000-0001-9174-8601
Current Organisations
University College London
,
University of Birmingham
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Publisher: American Chemical Society (ACS)
Date: 11-11-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1SC03775G
Abstract: Mixed valence Sn doping of Cs 3 Bi 2 Br 9 leads to broad visible light absorption.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3RA46558F
Publisher: American Physical Society (APS)
Date: 08-10-2014
Publisher: Springer Science and Business Media LLC
Date: 24-08-2022
DOI: 10.1038/S41467-022-32669-3
Abstract: I-V-VI 2 ternary chalcogenides are gaining attention as earth-abundant, nontoxic, and air-stable absorbers for photovoltaic applications. However, the semiconductors explored thus far have slowly-rising absorption onsets, and their charge-carrier transport is not well understood yet. Herein, we investigate cation-disordered NaBiS 2 nanocrystals, which have a steep absorption onset, with absorption coefficients reaching 5 cm −1 just above its pseudo-direct bandgap of 1.4 eV. Surprisingly, we also observe an ultrafast (picosecond-time scale) photoconductivity decay and long-lived charge-carrier population persisting for over one microsecond in NaBiS 2 nanocrystals. These unusual features arise because of the localised, non-bonding S p character of the upper valence band, which leads to a high density of electronic states at the band edges, ultrafast localisation of spatially-separated electrons and holes, as well as the slow decay of trapped holes. This work reveals the critical role of cation disorder in these systems on both absorption characteristics and charge-carrier kinetics.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA01485H
Abstract: The reversibility of oxygen anion redox is remarkably improved for partially Ti-substituted Na 4/7 [□ 1/7 Ti 1/7 Mn 5/7 ] and operates at a higher potential ( vs. Na/Na + ) compared with the parent material Na 4/7 [□ 1/7 Mn 6/7 ].
Publisher: American Chemical Society (ACS)
Date: 03-04-2017
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for David Scanlon.