Self-powered flexible artificial synapse for near-infrared light detection

In the era of artificial intelligence, photonic artificial synapses that are capable of light detection and information storage are attracting much attention, although complex device configuration and high energy consumption are two remaining challenges. Here, a flexible polymer-based optical synapse for infrared light detection in the absence of applied voltage is fabricated to emulate human synaptic photoplasticity. Investigation into the mechanism of the self-powered properties demonstrates that both the localized electric field of the polyethylene terephthalate (PET) substrate and the high dielectric constant of narrow-band conjugated polymer contribute to spontaneous exciton dissociation. Moreover, array imaging and data encryption are achieved by modulating light for the flexible devices, which exhibit excellent mechanical flexibility and long-term air stability. Thus, this work may provide a strategy to develop self-powered artificial synapses for infrared light detection.