Helical Nanofiber Photoelectric Synaptic Devices for an Artificial Vision Nervous System

摘要

Inspired by the helical structure and the resultant exquisitefunctionsof biomolecules, helical polymers have received increasing attention.Here, a series of poly(3-hexylthiophene)-block-poly(phenylisocyanide) (P3HT-b-PPI) copolymers were prepared using a simple one-pot living polymerization method. Interestingly,the P3HT(80)-b-PPI30 films werefound to have a helical nanofiber structure. The corresponding devicehas superior optoelectronic properties, such as a broadened spectralresponse range from the visible band to the deep ultraviolet (DUV)and an approximately 5-fold longer carrier decay time after DUV lightstimulation. An energy consumption of 1.44 fJ per synaptic event wasobtained, which is the lowest energy consumption achieved so far withDUV light stimulation. The encryption and decryption of images areimplemented using an array of devices. Finally, a photoreceptor neuralpathway was constructed to achieve early warning for the recognitionof the display of harmful light. This research provides an effectivestrategy for the development of a novel optoelectronic synaptic device.

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