Starch gated IGZO photoelectric neuromorphic transistors. (a) Schematic diagram of the device. (b) A typical post-synaptic current. (c) Typical PSC triggered with paired light pulses. (d) Schematic diagram of synergic effect in neurons activated by electric and light stimuli. (e) Absolute EPSC amplitude at zero time (t = 0) as a function of ΔT_Pre2-Pre1. Reprinted with permission from Ref. [92], Copyright 2020, Royal Society of Chemistry.