期刊
APPLIED PHYSICS LETTERS
卷 96, 期 15, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3400222
关键词
electrical conductivity transitions; electrical resistivity; interface states; Schottky barriers; semiconductor materials; semiconductor thin films; titanium compounds
资金
- National Research Program for the Nano Semiconductor Apparatus Development
- Korean Ministry of Knowledge and Economy
- Ministry of Education, Science and Technology [R31-2008-000-10075-0]
The electrical conduction mechanism within a resistive switching TiO2 film in its bipolar high resistance state was examined by ac impedance spectroscopy and dc current-voltage measurements. Bipolar switching, which can be initiated from a unipolar high resistance state, was attributed to both modulation of the Schottky barrier height at the film-electrode interface and the electronic energy state in the film. Numerical fittings of the impedance data revealed two distinct RC domains in series, which were attributed to an interfacial barrier (activation energy similar to 0.1 eV) and a nonconducting layer (activation energy similar to 0.5 eV), respectively.
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