Study on the electrical conduction mechanism of bipolar resistive switching TiO2 thin films using impedance spectroscopy

Min Hwan Lee; Kyung Min Kim; Gun Hwan Kim; Jun Yeong Seok; Seul Ji Song; Jung Ho Yoon; Cheol Seong Hwang
April 2010
Applied Physics Letters;4/12/2010, Vol. 96 Issue 15, p152909
Academic Journal
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 ∼0.1 eV) and a nonconducting layer (activation energy ∼0.5 eV), respectively.


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