物理化学学报 >> 2010, Vol. 26 >> Issue (01): 230-236.doi: 10.3866/PKU.WHXB20100138

材料物理化学 上一篇    下一篇

硫氰酸银钾复合薄膜的制备及其电存储特性

季欣, 董元伟, 徐伟   

  1. 复旦大学材料科学系, 上海 200433
  • 收稿日期:2009-07-19 修回日期:2009-11-02 发布日期:2009-12-29
  • 通讯作者: 徐伟 E-mail:wexu@fudan.edu.cn

Preparation and Electrical Memory Characteristics of Potassium Thiocyanate Argentite Composite Films

JI Xin, DONG Yuan-Wei, XU Wei   

  1. Department of Materials Science, Fudan University, Shanghai 200433, P. R. China
  • Received:2009-07-19 Revised:2009-11-02 Published:2009-12-29
  • Contact: XU Wei E-mail:wexu@fudan.edu.cn

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摘要：

采用真空热蒸镀法在银电极上蒸镀硫氰酸钾薄膜, 并通过界面反应在银电极表面上形成AgK2(SCN)3复合薄膜. 采用可见光谱、X射线光电子能谱(XPS)、激光拉曼光谱和X射线多晶衍射谱(XRD)对薄膜进行表征. 研究发现, Al/AgK2(SCN)3/Ag器件具有稳定的可逆电双稳特性, 高、低电阻状态的电阻比高达106, 并能实现连续“写-读-擦-读”操作. 器件的可逆擦写特性归因于外电场作用下AgK2(SCN)3复合介质层内导电通道的形成-断裂; 电流-电压曲线拟合显示, 低电阻状态符合欧姆传输, 而高电阻状态表现出空间电荷限制电流传输模式. 在导电通道断裂的过程中, 电离作用和焦耳热效应会共同起作用.

关键词: 电化学电离, 电双稳态, 导电通道, 界面反应, 真空热蒸发, 焦耳热效应

Abstract:

The vacuum thermal evaporation of KSCN onto the surface of a Ag electrode results in a AgK2(SCN)3 composite film through an interfacial reaction between the Ag and KSCN films. Visible spectroscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and X-ray diffraction (XRD) were used to investigate the film. The Al/AgK2(SCN)3/Ag device exhibited reversible electrical bistability with a resistance ratio of 106 and it was successively operated in a“write-read-erase-read”mode. The reversible writing and erasing performance of the device is attributed to the formation and rupture of conducting channels through the AgK2(SCN)3 composite layer. By fitting the currentvoltage curves, the low-and high-resistance states are shown to follow ohmic conduction and space charge limited current conduction, respectively. We suggest that the annihilation of conducting channels is caused by the electrochemical ionization together with the Joule heating effect.

Key words: Electrochemical ionization, Electrical bistable states, Conducting channel, Interface reaction, Vacuum thermal evaporation, Joule heating effect