Oxygen vacancies at the surface of SrTiO{sub 3} thin films

Journal Article · Tue Jan 21 00:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4861730· OSTI ID:22275749

Silva, Alexandre R., E-mail: [e-mail] ^[1]; Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-580 Santo André, SP ^[2]; Dalpian, Gustavo M., E-mail: [e-mail] ^[3]

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1. Colegiado de Engenharia Mecânica, Universidade Federal do Vale do São Francisco, 48902-300 Juazeiro, BA (Brazil)
2. (Brazil)
3. Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-580 Santo André, SP (Brazil)

The two-dimensional electron gas (2DEG) observed at the surface of oxide thin films and at the interface between two oxides has been widely discussed, but the mechanism responsible for this behavior is still not well understood. In this work, we study the properties of the SrTiO{sub 3} (001) surface and show that defects are necessary in order to explain this 2DEG. We study the properties of oxygen vacancies at the TiO{sub 2} and SrO terminated surface, and conclude they can explain the metallic behavior experimentally observed. There is a strong tendency for these vacancies to be localized at the surface, where the formation energy is less than 2.92 eV.

• OSTI ID: 22275749
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON GAS
FORMATION HEAT
INTERFACES
OXYGEN
STRONTIUM OXIDES
STRONTIUM TITANATES
SURFACES
THIN FILMS
TITANIUM OXIDES
TWO-DIMENSIONAL CALCULATIONS
VACANCIES