Abstract
As a postprograming resistance shift, the relaxation effect could be a major issue for resistive random access memory (RRAM) applications. To understand the physical mechanisms of the relaxation effect, temperature-related ion and charge movements are analyzed using the incremental-step-pulse program (ISPP) and repeat-cycle program (RCP). Pre-electron detrapping (PED) operation is found to minimize the amount of interfacial trapped charges and thus to greatly reduce the resistance relaxation effect. Our experimental results demonstrate the improved data retention and tight distribution of RRAM arrays as a result of the above optimized program operations.
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