Mg-Ion-Based Electrochemical Synapse With Superior Retention

Abstract

We introduce a novel all-solid-state Mg-ion-based electrochemical RAM (Mg-ECRAM) that utilizes a highly stable MgF2 electrolyte known for its high ionic conductivity ( $\sigma _{\text {ion}}\text {)}$ and low electrical conductivity ( $\sigma \text {)}$ . Additionally, crystalline WO $_{{2}.{8}}$ (C-WO $_{{2}.{8}}\text {)}$ is used as the channel material because of its excellent ion diffusivity (D $_{\text {ion}}\text {)}$ . Comprehensively, our findings reveal nearly perfect weight update linearity and exceptional retention capabilities, lasting approximately six years. These results indicate that Mg-ions are suitable for ECRAM systems, offering desirable and dependable synaptic properties. Moreover, the physical intercalation of Mg-ions into the WO $_{{2}.{8}}$ channel is confirmed in real-time by the sequential modulation of Raman peaks, which correspond to the levels of potentiation or depression.