Comparison of writing methods of single memory cell with volatile and nonvolatile memory functions

摘要

A single memory cell having both volatile memory (VM) and nonvolatile memory (NVM) functions with an independent asymmetric dual-gate structure is reported, as well as its programming methods. In the case of operating the device as a VM cell, a higher sensing margin is obtained, and an undesirable soft-programming issue is suppressed when a gate-induced drain leakage programming method is used. Additionally, the sensing margin and hold retention time of the VM operation are improved in a programmed state of the NVM function. These results indicate that the proposed device has potential for high-density embedded-memory applications. (C) 2017 The Japan Society of Applied Physics