Transition from nonvolatile bipolar memory switching to bidirectional threshold switching in layered MoO3 nanobelts

被引:24
作者
Du, Huiying [1 ]
Chen, Jinghong [1 ]
Tu, Meilin [1 ]
Luo, Songwen [1 ]
Li, Shangdong [2 ]
Yuan, Shuoguo [3 ]
Gong, Tianxun [2 ]
Huang, Wen [2 ]
Jie, Wenjing [1 ]
Hao, Jianhua [3 ]
机构
[1] Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610066, Sichuan, Peoples R China
[2] Univ Elect Sci & Technol China, Sch Elect Sci & Engn, State Key Lab Electmn Thin Films & Integrated Dev, Chengdu 610054, Sichuan, Peoples R China
[3] Hong Kong Polytech Univ, Dept Appl Phys, Hung Ham, Kowloon, Hong Kong, Peoples R China
基金
中国国家自然科学基金;
关键词
MOLYBDENUM; MEMRISTOR; MEMTRANSISTORS;
D O I
10.1039/c9tc03842f
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Resistive switching (RS) can be divided into two categories, namely nonvolatile memory switching and volatile threshold switching, depending on the volatility. MoO3 is one type of versatile transition metal oxide with a high work function, large electron affinity and wide band gap for potential applications in electronics, optoelectronics, batteries and electrochromic devices. Herein, we report the transition from nonvolatile memory to volatile threshold switching in single MoO3 nanobelts simply by changing the electrodes from Au to Ag. The one-dimensional (1D) alpha-MoO3 nanobelts are synthesized by a hydrothermal method and annealed under different atmospheres to adjust the concentration of oxygen vacancies. The prepared single MoO3 nanobelt is used to serve as the RS layer to construct lateral two-terminal RS devices. By using Au as the electrodes, the MoO3 nanobelts exhibit typical nonvolatile bipolar memory RS behaviors. On the other hand, bidirectional threshold RS properties can be achieved by employing Ag as the electrodes due to the large contact resistance between Ag and MoO3. More importantly, the threshold RS performance is significantly enhanced by annealing the nanobelts in N-2. The ON/OFF current ratio is increased up to 3 x 10(5) while the threshold voltage is decreased down to 0.75 V. These results demonstrate the diverse RS behaviors in single 1D MoO3 nanobelts and potential applications in volatile and non-volatile switching devices. In addition, the finding provides guidelines for improvement and/or alternation of RS behaviors through defect engineering and/or device modification in the multifunctional emerging devices.
引用
收藏
页码:12160 / 12169
页数:10
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