Ionotronic oxide neuromorphic transistor with pair-, triplet-, and quadruplet-spike-timing-dependent plasticity activities

Electrolyte-gating poses a unique strategy to modulate physical characteristics and electronic transport properties of condensed materials. Here, solution-processed chitosan-based electrolyte-gated oxide ionotronic neuromorphic transistors are fabricated. Benefitting from unique protonic interfacial coupling processes, the ionotronic transistors can mimic different kinds of spike-timing-dependent plasticity (STDP), including the classical pair-STDP rule, triplet-STDP, and quadruplet-STDP. The triplet-STDP activities could be well explained with Froemke's triplet-STDP model, which proved to be effective in the biological nerve system. The oxide ionotronic neuromorphic transistors could act as fundamental building blocks in neuromorphic platforms.