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The impacts of HfO_x inserting layer thickness on the electrical properties of the ZnO-based transparent resistance random access memory(TRRAM) device were investigated in this paper. The bipolar resistive switching behavior of a single ZnO film and bilayer HfO_x/ZnO films as active layers for TRRAM devices was demonstrated. It was revealed that the bilayer TRRAM device with a 10-nm HfO_x inserted layer had a more stable resistive switching behavior than other devices including the single layer device, as well as being forming free, and the transmittance was more than 80% in the visible region. For the HfO_x/ZnO devices, the current conduction behavior was dominated by the space-charge-limited current mechanism in the low resistive state(LRS) and Schottky emission in the high resistive state(HRS), while the mechanism for single layer devices was controlled by ohmic conduction in the LRS and Poole–Frenkel emission in the HRS. 相似文献
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