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The influence of electron injection on the electric-pulse-induced resistive switching of Pt∕TiO2 thin film/Pt structure was studied by current-voltage (I-V) measurements. The electron injection was increased by annealing the sample in a N2 atmosphere or measuring the I-V characteristics at high temperatures (100°C). The switching from the high-resistance state (HRS) to the low-resistance state by a filamentary mechanism was suppressed when the carrier injection by Schottky emission or space-charge-limited conduction (SCLC) was excessive. Interfacial potential barrier played a crucial role in determining the carrier injection. Switching was observed (not observed) when the HRS resistance was low (high) although SCLC was observed.
Kim et al. (Mon,) studied this question.