The conduction mechanism and resistive switching properties in a resistive-random-access-memory device composed of Al(top)/TiOx/TiO2/Al( bottom) are investigated in this paper. The active-top-electrode (TE) material aluminum interacted with the TiO2layer and induced an oxygen-deficient TiOxlayer near the TE. The naturally formed oxygen-deficient TiOxlayer was confirmed by a transmission-electron-microscope energy-dispersive X-ray spectrometry analysis. The oxygen-deficient TiOxregion acted as a trap for electrons and contributed to the resistive switching. The proposed mechanism and measured data are verified through simulation of a two-variable resistor model.
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Kim et al. (2009) studied this question.
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