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Issue 27, 2016
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Role of oxygen vacancies in crystalline WO3

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Oxygen vacancies have been invoked to explain electrochromic behavior in WO3, but the microscopic mechanism behind this phenomenon remains under debate. We use hybrid density functional theory to investigate the local atomic relaxations, formation energy, and possible charge states of the various configurations of the oxygen vacancy in the monoclinic and cubic phase of WO3. Our results indicate that the oxygen vacancy is a shallow donor, most stable in the +2 charge state (V2+O), and does not introduce deep levels in the band gap. We therefore conclude that the oxygen vacancy in WO3 simply introduces carriers to the conduction band, and discuss its implications on observed material properties, including electrical conductivity and electrochromism.

Graphical abstract: Role of oxygen vacancies in crystalline WO3

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Article information

22 Apr 2016
20 Jun 2016
First published
20 Jun 2016

J. Mater. Chem. C, 2016,4, 6641-6648
Article type

Role of oxygen vacancies in crystalline WO3

W. Wang, A. Janotti and C. G. Van de Walle, J. Mater. Chem. C, 2016, 4, 6641
DOI: 10.1039/C6TC01643J

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