Mg-Ion-Based Electrochemical Synapse With Superior Retention

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 (<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\sigma _{\text {ion}}\text {)}$ </tex-math></inline-formula> and low electrical conductivity (<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\sigma \text {)}$ </tex-math></inline-formula>. Additionally, crystalline WO<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$_{{2}.{8}}$ </tex-math></inline-formula> (C-WO<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$_{{2}.{8}}\text {)}$ </tex-math></inline-formula> is used as the channel material because of its excellent ion diffusivity (D<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$_{\text {ion}}\text {)}$ </tex-math></inline-formula>. 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<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$_{{2}.{8}}$ </tex-math></inline-formula> channel is confirmed in real-time by the sequential modulation of Raman peaks, which correspond to the levels of potentiation or depression.