以 ZnO∶Al为底电极, Cu为顶电极, 在同种工艺条件下分别制备了类电容结构的纯ZnO 阻变器件和ZnO∶2%Cu阻变器件, 分析比较了两种器件的典型I-V特性曲线、置位电压(VSet)和复位电压(VReset)的分布范围、器件的耐久性。结果显示, ZnO∶Cu阻变器件较纯ZnO阻变器件有更大的开关比和更稳定的循环性能。另外, 研究了 ZnO∶Cu阻变器件的阻变机理, 通过对其I-V特性曲线分析得出以下结论: ZnO∶Cu阻变器件在高阻态遵循空间电荷限制电流效应, 低阻态符合欧姆定律。

Pure ZnO resistive switching and ZnO∶2%Cu resistive switching with sandwich structure were fabricated in the same conditions. The bottom electrode was ZnO∶Al, and the top electrode was Cu for the resistive switchings. The switching characteristics such as endurance, variations of threshold voltage as well as distribution of resistance were investigated. The results demonstrate that the ZnO∶Cu devices exhibit more excellent switching performance than ZnO devices. In addition, the switching mechanism of ZnO∶Cu resistive device were also studied in this paper. The I-V characteristics of the device indicate that the conduction mechanisms of high and low resistance states can be explained by trap-controlled space charge limited current (SCLC) and Ohmics law, respectively.