Role of the ferroelastic strain in the optical absorption of BiVO4
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 refle...
| Κύριοι συγγραφείς: | , , , , , , |
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| Μορφή: | Άρθρο |
| Γλώσσα: | English |
| Έκδοση: |
AIP Publishing LLC
2020-08-01
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| Σειρά: | APL Materials |
| Διαθέσιμο Online: | http://dx.doi.org/10.1063/5.0011507 |
| _version_ | 1828816568145936384 |
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| author | Christina Hill Mads C. Weber Jannis Lehmann Tariq Leinen Manfred Fiebig Jens Kreisel Mael Guennou |
| author_facet | Christina Hill Mads C. Weber Jannis Lehmann Tariq Leinen Manfred Fiebig Jens Kreisel Mael Guennou |
| author_sort | Christina Hill |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-12T11:06:21Z |
| format | Article |
| id | doaj.art-fff62246a9854afc901b6db157fa4d78 |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-12-12T11:06:21Z |
| publishDate | 2020-08-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-fff62246a9854afc901b6db157fa4d782022-12-22T00:26:24ZengAIP Publishing LLCAPL Materials2166-532X2020-08-0188081108081108-610.1063/5.0011507Role of the ferroelastic strain in the optical absorption of BiVO4Christina Hill0Mads C. Weber1Jannis Lehmann2Tariq Leinen3Manfred Fiebig4Jens Kreisel5Mael Guennou6Materials Research and Technology Department, Luxembourg Institute of Science and Technology, 41 rue du Brill, L-4422 Belvaux, LuxembourgDepartment of Materials, ETH Zurich, Vladimir-Prelog-Weg 4, 8093 Zurich, SwitzerlandDepartment of Materials, ETH Zurich, Vladimir-Prelog-Weg 4, 8093 Zurich, SwitzerlandDepartment of Materials, ETH Zurich, Vladimir-Prelog-Weg 4, 8093 Zurich, SwitzerlandDepartment of Materials, ETH Zurich, Vladimir-Prelog-Weg 4, 8093 Zurich, SwitzerlandDepartment of Physics and Materials Science, University of Luxembourg, 41 rue du Brill, L-4422 Belvaux, LuxembourgDepartment of Physics and Materials Science, University of Luxembourg, 41 rue du Brill, L-4422 Belvaux, LuxembourgBismuth 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.http://dx.doi.org/10.1063/5.0011507 |
| spellingShingle | Christina Hill Mads C. Weber Jannis Lehmann Tariq Leinen Manfred Fiebig Jens Kreisel Mael Guennou Role of the ferroelastic strain in the optical absorption of BiVO4 APL Materials |
| title | Role of the ferroelastic strain in the optical absorption of BiVO4 |
| title_full | Role of the ferroelastic strain in the optical absorption of BiVO4 |
| title_fullStr | Role of the ferroelastic strain in the optical absorption of BiVO4 |
| title_full_unstemmed | Role of the ferroelastic strain in the optical absorption of BiVO4 |
| title_short | Role of the ferroelastic strain in the optical absorption of BiVO4 |
| title_sort | role of the ferroelastic strain in the optical absorption of bivo4 |
| url | http://dx.doi.org/10.1063/5.0011507 |
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