Polymer-Decorated 2D MoS₂ Synaptic Transistors for Biological Bipolar Metaplasticities Emulation*

Biological bipolar metaplasticities were successfully mimicked in two-dimensional (2D) MoS 2 transistors via the implementation of two different MoS 2 surface decorations, poly (vinyl alcohol) (PVA) and chitosan bio-polymers. Interestingly, the depressing metaplasticity was successfully mimicked when the PVA bio-polymer was used as the surface decoration layer, whereas the metaplasticity of long-term potentiation was realized when the chitosan bio-polymer was taken as the surface decoration layer. Furthermore, the electronic band structures of the 2D MoS 2 devices with different surface decorations were further investigated using first-principles calculations for understanding the underlying mechanisms of such bipolar metaplasticities. These results will deepen our understanding of metaplasticity, and have great potential in neuromorphic computing applications.