Evaluation of optical band gaps and dopant state energies in transition metal oxides using oxidation-state constrained density functional theory

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Article number365901
Journal / PublicationJournal of Physics: Condensed Matter
Volume33
Issue number36
Online published8 Jul 2021
Publication statusPublished - 8 Sep 2021

Abstract

We report the use of oxidation-state constrained density functional theory (OS-CDFT) to calculate the optical band gaps of transition metal oxides and dopant state energies of different doped anatase. OS-CDFT was used to control electron transfer from the valence band maximum of the transition metal system to the conduction band minimum or to the dopant state in order to calculate the band gap or the dopant state energies respectively. The calculation of the dopant state energies also allows identification of the transition responsible for the reduced band gap of the doped system in ambiguous cases. We applied this approach to the band gap calculation in TiO2 anatase and rutile, vanadium pentoxide (V2O5), chromium(III) oxide (Cr2O3), manganese(IV) oxide (MnO2), ferric oxide (Fe2O3), ferrous oxide (FeO) and cobalt(II) oxide (CoO). The dopant state energies calculations were carried out in the V-, Cr-, Mn-, and Fe-doped anatase.

Research Area(s)

  • constrained density functional theory, transition metal oxides, band gaps

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