Journal
PHYSICAL REVIEW B
Volume 68, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.68.233204
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We find, from first principles calculations, that an oxygen (anion) vacancy in WO3 not only generates a donorlike state near the fundamental band gap, derived from the top valence bands, but also gives rise to an additional pair of defect states: a hyper-deep resonant state in the valence band and a high-lying resonant state in the conduction band, derived from s-like bonding and antibonding bands, respectively. These states show distinctively different properties from their counterparts in other conventional semiconductors. With a change in the charge state of the vacancy, a strong lattice relaxation is found for the W ions nearest to the vacancy, accompanied by large changes in the energies of all the defect states.
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