Hou, Q;
Buckeridge, J;
Lazauskas, T;
Mora-Fonz, D;
Sokol, AA;
Woodley, SM;
Catlow, CRA;
(2018)
Defect formation in In2O3 and SnO2: a new atomistic approach based on accurate lattice energies.
Journal of Materials Chemistry C
, 6
(45)
pp. 12386-12395.
10.1039/c8tc04760j.
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Abstract
We present a consistent interatomic force field for indium sesquioxide (In2O3) and tin dioxide (SnO2) that has been derived to reproduce lattice energies and, consequently, the oxygen vacancy formation energies in the respective binary compounds. The new model predicts the dominance of Frenkel-type disorder in SnO2 and In2O3, in good agreement with ab initio defect calculations. The model is extended to include free electron and hole polarons, which compete with charged point defects to maintain charge neutrality in a defective crystal. The stability of electrons and instability of holes with respect to point defect formation rationalises the efficacy of n-type doping in tin doped indium oxide (ITO), a widely employed transparent conducting oxide in optoelectronic applications. We investigate the clustering of Sn substitutional and oxygen interstitial sites in ITO, finding that the dopants substitute preferentially on the cation crystallographic d site in the bixbyite unit cell, in agreement with experiment. The force field described here provides a useful avenue for the investigation of the defect properties of extended transparent conducting oxide systems, including solid solutions.
Type: | Article |
---|---|
Title: | Defect formation in In2O3 and SnO2: a new atomistic approach based on accurate lattice energies |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1039/c8tc04760j |
Publisher version: | https://doi.org/10.1039/c8tc04760j |
Language: | English |
Additional information: | This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/). |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
URI: | https://discovery.ucl.ac.uk/id/eprint/10063980 |
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