Physical model for electroforming process in valence change resistive random access memory
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A physical model is developed for electroforming process in valence change resistive random access memory. In the developed model, electric field- and temperature-dependent vacancy generation, drift/diffusion in the forming process are considered. Based on the proposed model, the intrinsic nature of pulse amplitude dependence of forming time is attributed to combined effects of vacancy generation and migration. The evolution of microscopic vacancy concentration during forming operation is calculated and the effect of vacancy migration on forming process is quantitatively evaluated. The simulated pulse amplitude dependence of forming time agrees well with the experimental data.
KeywordsValence change memory (VCM) Physical model Electroforming process Vacancy migration Hopping transport
This work was supported by the National Natural Science Foundation of China (Grant No. 61306117, 61322408, 61221004, 61334007, 61274091, 61106119, and 61106082) and the National Basic Research Program of China (973 Program) (Grant No. 2010CB934200 and 2011CBA00602) and National High Technology Research and Development Program (863 Program) (Grant No. 2014AA032900, 2011AA010401 and 2011AA010402)
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