Abstract

Recreatingthe visual-perception properties using organic electronic devices is highlydesired for visual prosthetics and artificial intelligence. Although theintegration of organic light-sensing components with synaptic devices canrealize the recognition and memory functions for perceived images, complicatedproblems in device integration for practical applications are generallyencountered. Here we demonstrate a new type of organic photosynaptic devicebased on organic molecular crystals, which can provide optical-sensing andsynaptic functions together in one device by means of a unique photon-inducedcharge transfer effect. This device successfully emulates the workingprinciples of human visual perception in terms of short-term plasticity,long-term potentiation, and spike-timing-dependent plasticity. Moreover, aproof-of-concept artificial image-perception system is demonstrated byintegrating the photosynapses on a flexible substrate. The new devices usingorganic semiconductors may open up innovative application areas, such as artificiallyintelligent electronic and perception systems, and facilitate the integrationof such devices into nextgeneration flexible and stretchable electronics.

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