Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3604811
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Funding
- EPSRC [EP/F067496]
- Engineering and Physical Sciences Research Council [EP/F067496/1] Funding Source: researchfish
- EPSRC [EP/F067496/1] Funding Source: UKRI
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Metal oxides are typically insulating materials that can be made conductive through aliovalent doping and/or non-stoichiometry. Recent studies have identified conductive states at surfaces and interfaces of pure oxide materials; high electron concentrations are present, resulting in a high-mobility two-dimensional electron gas. We demonstrate for In2O3 that the energy required to form an oxygen vacancy decreases rapidly towards the (111) surface, where the coordination environment is lowered. This is a general feature of metal oxide systems that can result in a metal-insulator transition where donors are produced at chemically reduced extended defects. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3604811]
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