Assessment of Strain-Generated Oxygen Vacancies Using SrTiO3 Bicrystals

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Atomic-scale defects strongly influence the electrical and optical properties of materials, and their impact can be more pronounced in localized dimensions. Here, we directly demonstrate that strain triggers the formation of oxygen vacancies in complex oxides by examining the tilt boundary of SrTiO3 bicrystals. Through transmission electron microscopy and electron energy loss spectroscopy, we identify strains along the tilt boundary and oxygen vacancies in the strain-imposed regions between dislocation cores. First-principles calculations support that strains, irrespective of their type or sign, lower the formation energy of oxygen vacancies, thereby enhancing vacancy formation. Finally, current-voltage measurements confirm that such oxygen vacancies at the strained boundary result in a decrease of the nonlinearity of the I-V curve as well as the resistivity. Our results strongly indicate that oxygen vacancies are preferentially formed and are segregated at the regions where strains accumulate, such as heterogeneous interfaces and grain boundaries.
Publisher
AMER CHEMICAL SOC
Issue Date
2015-06
Language
English
Article Type
Article
Keywords

GRAIN-BOUNDARIES; ROOM-TEMPERATURE; STRONTIUM-TITANATE; ELECTRON-GAS; INTERFACE; CHEMISTRY; DEFECTS

Citation

NANO LETTERS, v.15, no.6, pp.4129 - 4134

ISSN
1530-6984
DOI
10.1021/acs.nanolett.5b01245
URI
http://hdl.handle.net/10203/200096
Appears in Collection
MS-Journal Papers(저널논문)
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