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Role of the ferroelastic strain in the optical absorption of BiVO4
Hill, Christina; Weber, Mads C.; Lehmann, Jannis et al.
2020In APL Materials, 8 (8)
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Abstract :
[en] Bismuth vanadate (BiVO4) has recently been under focus for its potential use in photocatalysis thanks to its well-suited absorption edge in the visible light range. Here, we characterize the optical absorption of a BiVO4 single crystal as a function of temperature and polarization direction by reflectance and transmittance spectroscopy. The optical bandgap is found to be very sensitive to the temperature, and to the tetragonal-to-monoclinic ferroelastic transition at 523 K. The anisotropy, as measured by the difference in the absorption edge for the light polarized parallel and perpendicular to the principal axis, is reduced from 0.2 eV in the high-temperature tetragonal phase to 0.1 eV at ambient temperature. We show that this evolution is dominantly controlled by the ferroelastic shear strain. These findings provide a route for further optimization of bismuth vanadate-based light absorbers in photocatalytic devices.
Disciplines :
UNKNOWN KEY #A99
Author, co-author :
Hill, Christina
Weber, Mads C.
Lehmann, Jannis
Leinen, Tariq
Fiebig, Manfred
Kreisel, Jens ;  University of Luxembourg > CRC > Vice-rectorate for Research (VR Research)
Guennou, Mael  ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
External co-authors :
yes
Language :
English
Title :
Role of the ferroelastic strain in the optical absorption of BiVO4
Publication date :
2020
Journal title :
APL Materials
ISSN :
2166-532X
Publisher :
American Institute of Physics Publising LLC, United States - New York
Volume :
8
Issue :
8
Peer reviewed :
Peer Reviewed verified by ORBi
FnR Project :
FNR10935404 - Materials For Sensing And Energy Harvesting, 2015 (01/10/2016-31/03/2023) - Emmanuel Defay
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