An organic artificial optoelectronic synapse based on MEH-PPV:PCBM bulk heterojunction
Integrating optical sensing and synaptic functions in artificial optoelectronic synapses demonstrates significant advantages in processing visual information and performing complex learning,recognition,and memory tasks.Existing reported photonic synapse devices exhibit relatively limited and unstable functional implementations.Hence,exploring synaptic devices with novel materials and structures becomes crucial for handling complex and variable sensory information.In this study,we employed poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene](MEH-PPV)and[6,6]-Phenyl C61 butyric acid methyl ester(PCBM)organic semiconductor materials to construct a vertical optically modulated resistive switching device.The device exhibited outstanding performance in processing visual information and simulating neural morphological behaviors.Through the use of a bulk heterojunction structure,the device achieved stable and gradual resistive changes,successfully simulating voltage-controlled long-term potentiation/inhibition and presenting diverse synaptic plasticity under combined optical and electrical modulation.Furthermore,the device successfully emulated pattern recognition and memory functions observed in the human visual nervous system.This work provides a potential optoelectronic device solution for processing complex and variable sensory information.
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