Fully Light‐Modulated Organic Artificial Synapse with the Assistance of Ferroelectric Polarization

Abstract Optoelectronic synapses integrating synaptic and sensing functions have great potential in visual information processing and neuromorphic computing. Here, an artificial optoelectronic synapse based on copper‐phthalocyanine (CuPc) and poly(vinylidene fluoridetrifluoroethylene) (P(VDF‐TrFE)) is reported. The fabricated two‐terminal device exhibits bidirectional responses to light pulses with different wavelengths, which endows the device the capability to implement both excitatory and inhibitory synaptic behaviors in an optical pathway. The introduction of P(VDF‐TrFE) greatly improves the performance of the device as an artificial synapse, because the ferroelectric polarization of P(VDF‐TrFE) can control the relaxation behavior of the device. After mimicking some basic functions of biological synapses, the device is successfully applied to simulate the action and relaxation process of nociceptors when suffering from external harmful stimuli.