An overview of the switching parameter variation of RRAM

作     者：Meiyun Zhang Shibing Long Guoming Wang Yang Li Xiaoxin Xu Hongtao Liu Ruoyu Liu Ming Wang Congfei Li Pengxiao Sun Haitao Sun Qi Liu Hangbing L Ming Liu 

作者机构：Laboratory of Nanofabrication and Novel Device IntegrationInstitute of Microelectronics Chinese Academy of Sciences 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2014年第59卷第36期

页      面：5324-5337页

核心收录：

学科分类：08[工学] 081201[工学-计算机系统结构] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(61322408,61221004,61334007,61274091,61106119 and 61106082) National Basic Research Program of China(2010CB934200 and 2011CBA00602) National High Technology Research and Development Program of China(2011AA010401 and 2011AA010402) 

主　　题：切换 参数变化 非易失性存储器 随机存取存储器 统计分析模型 操作速度 统计方法 渗流模型 

摘      要：Resistive random access memory(RRAM) has been considered as one of the most promising candidates for next-generation nonvolatile memory, due to its advantages of simple device structure, excellent scalability, fast operation speed and low power consumption. Deeply understanding the physical mechanism and effectively controlling the statistical variation of switching parameters are the basis of fostering RRAM into commercial application. In this paper, based on the deep understanding on the mechanism of the formation and rupture of conductive filament, we summarize the methods of analyzing and modeling the statistics of switching parameters such as SET/RESET voltage, current, speed or time. Then, we analyze the distributions of switching parameters and the influencing factors. Additionally, we also sum up the analytical model of resistive switching statistics composed of the cell-based percolation model and SET/RESET switching dynamics. The results of the model can successfully explain the experimental distributions of switching parameters of the Ni O- and Hf O2-based RRAM devices. The model also provides theoretical guide on how to improve the uniformity and reliability such as disturb immunity. Finally, some experimental approaches to improve the uniformity of switching parameters are discussed.