Two-terminal organic optoelectronic synapse based on poly(3-hexylthiophene) for neuromorphic computing

Abstract

Owe to their advantages of unique electronic structure, physical flexibility and easy processability, conducting polymers are considered as one of the most competitive candidates for organic synaptic devices. However, conventional organic synaptic devices are based on electric modulation or three-terminal structure which are not conducive to construction of neural networks with high integration density. Here, a two-terminal organic optoelectronic device based on poly(3-hexylthiophene) (P3HT) is prepared via a simple spin-coating method. The fabricated synaptic device shows sensitive response to the light stimuli and successfully simulates the basic functions of biological synapse, such as excitatory postsynaptic current (EPSC), pair-pulse facilitation (PPF). Furthermore, the capabilities of simulating “learning-experience” behavior, detecting and memorizing the integrated optical information are also realized by this artificial synapse. • A two-terminal optoelectronic device with a structure of ITO/P3HT/Au is prepared. • The device successfully simulates biological synaptic functions under light stimuli. • The device shows the capability of simulating learning-experience behavior.