Direct observation of anisotropic small-hole polarons in an orthorhombic structure of BiVO₄ films
Here, we report an anisotropic small-hole polaron in an orthorhombic structure of BiVO₄ films grown by pulsed-laser deposition on yttrium-doped zirconium oxide substrate. The polaronic state and electronic structure of BiVO₄ films are revealed using a combination of polarization-dependent x-ray abso...
| Main Authors: | , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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American Physical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/115989 |
| _version_ | 1826212309299625984 |
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| author | Chaudhuri, A. Mandal, L. Chi, X. Yang, M. Scott, M. C. Motapothula, M. Yu, X. J. Yang, P. Venkatesan, T. Wee, A. T. S. Rusydi, A. Shao-Horn, Yang |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Chaudhuri, A. Mandal, L. Chi, X. Yang, M. Scott, M. C. Motapothula, M. Yu, X. J. Yang, P. Venkatesan, T. Wee, A. T. S. Rusydi, A. Shao-Horn, Yang |
| author_sort | Chaudhuri, A. |
| collection | MIT |
| description | Here, we report an anisotropic small-hole polaron in an orthorhombic structure of BiVO₄ films grown by pulsed-laser deposition on yttrium-doped zirconium oxide substrate. The polaronic state and electronic structure of BiVO₄ films are revealed using a combination of polarization-dependent x-ray absorption spectroscopy at VL[subscript 3,2] edges, spectroscopic ellipsometry, x-ray photoemission spectroscopies, and high-resolution x-ray diffraction with the support of first-principles calculations. We find that in the orthorhombic phase, which is slightly different from the conventional pucherite structure, the unoccupied V 3d orbitals and charge inhomogeneities lead to an anisotropic small-hole polaron state. Our result shows the importance of the interplay of charge and lattice for the formation of a hole polaronic state, which has a significant impact in the electrical conductivity of BiVO₄, hence its potential use as a photoanode for water splitting. |
| first_indexed | 2024-09-23T15:19:41Z |
| format | Article |
| id | mit-1721.1/115989 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:19:41Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1159892022-10-02T02:11:20Z Direct observation of anisotropic small-hole polarons in an orthorhombic structure of BiVO₄ films Chaudhuri, A. Mandal, L. Chi, X. Yang, M. Scott, M. C. Motapothula, M. Yu, X. J. Yang, P. Venkatesan, T. Wee, A. T. S. Rusydi, A. Shao-Horn, Yang Massachusetts Institute of Technology. Department of Mechanical Engineering Shao-Horn, Yang Here, we report an anisotropic small-hole polaron in an orthorhombic structure of BiVO₄ films grown by pulsed-laser deposition on yttrium-doped zirconium oxide substrate. The polaronic state and electronic structure of BiVO₄ films are revealed using a combination of polarization-dependent x-ray absorption spectroscopy at VL[subscript 3,2] edges, spectroscopic ellipsometry, x-ray photoemission spectroscopies, and high-resolution x-ray diffraction with the support of first-principles calculations. We find that in the orthorhombic phase, which is slightly different from the conventional pucherite structure, the unoccupied V 3d orbitals and charge inhomogeneities lead to an anisotropic small-hole polaron state. Our result shows the importance of the interplay of charge and lattice for the formation of a hole polaronic state, which has a significant impact in the electrical conductivity of BiVO₄, hence its potential use as a photoanode for water splitting. 2018-05-30T18:36:55Z 2018-05-30T18:36:55Z 2018-05 2018-04 2018-05-26T18:00:19Z Article http://purl.org/eprint/type/JournalArticle 2469-9950 2469-9969 http://hdl.handle.net/1721.1/115989 Chaudhuri, A. et al. "Direct observation of anisotropic small-hole polarons in an orthorhombic structure of BiVO₄ films." Physical Review B 97, 19 (May 2018): 195150 © 2018 American Physical Society en http://dx.doi.org/10.1103/PhysRevB.97.195150 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Chaudhuri, A. Mandal, L. Chi, X. Yang, M. Scott, M. C. Motapothula, M. Yu, X. J. Yang, P. Venkatesan, T. Wee, A. T. S. Rusydi, A. Shao-Horn, Yang Direct observation of anisotropic small-hole polarons in an orthorhombic structure of BiVO₄ films |
| title | Direct observation of anisotropic small-hole polarons in an orthorhombic structure of BiVO₄ films |
| title_full | Direct observation of anisotropic small-hole polarons in an orthorhombic structure of BiVO₄ films |
| title_fullStr | Direct observation of anisotropic small-hole polarons in an orthorhombic structure of BiVO₄ films |
| title_full_unstemmed | Direct observation of anisotropic small-hole polarons in an orthorhombic structure of BiVO₄ films |
| title_short | Direct observation of anisotropic small-hole polarons in an orthorhombic structure of BiVO₄ films |
| title_sort | direct observation of anisotropic small hole polarons in an orthorhombic structure of bivo₄ films |
| url | http://hdl.handle.net/1721.1/115989 |
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