An Array of Light‐Stimulated Two‐Terminal Synaptic Devices with the Modulation of Electric Polarity

Neuromorphic visual systems based on optoelectronic synaptic devices have been recently studied to simulate the retina and visual cortex of a human being. Now it is shown that an array of optoelectronic synaptic devices based on the two-terminal structure of Si/perovskite/Au may mimic the functionalities of lateral geniculate nucleus (LGN) cells. Benefiting from the photovoltaic effect, the devices can work under a self-powered mode. Diverse synaptic functionalities such as postsynaptic current, paired-pulse facilitation/depression, spike duration-dependent plasticity, spike number-dependent plasticity, and spike rate-dependent plasticity have been simulated. By modulating the electric bias of the devices in the array the simulation of the positional and orientational recognition of the LGN cells is demonstrated.