Silicon-Based Hybrid Optoelectronic Devices with Synaptic Plasticity and Stateful Photoresponse

Neuromorphic optoelectronic devices with new functionality have attracted much attention since they can be applied in energy-efficient computing and recognition. Here, a silicon optoelectronic device with a designed configuration resembling the retinal circuitry is reported. This kind of device composed of a silicon photoreceptor and a hafnium metal oxide synapse supports optoelectronic spike-timing-dependent plasticity that is manipulated completely by both optical and electrical stimuli. The optoelectronic plasticity allows the lasting modulation of photoresponses by using a transient optoelectronic stimulus. Stateful photoresponses can thus be regulated according to either the illumination intensity or the electrical compliance current.