Ionic Liquid-doped Organic Polymer Memristors for Low-voltage Artificial Optoelectronic Synapses
Memristor-based neuromorphic computing showcases great potential for overcoming the von Neumann bottleneck and enabling energy-efficient data processing.Organic polymers,due to their excellent semiconductor and optoelectronic properties as well as solution processability,are ideal candidates for low-cost memristor and synap-tic applications.However,the high operating voltage and random switching of resistive states in polymer memristors limit their performance in neuromorphic chips and increase the complexity of peripheral circuits.In this study,the polymer MEH-PPV doped with ionic liquid[EMIM][PF6]was used as the active layer to construct a vertically struc-tured memristor.This design provides a variety of short-term and long-term synaptic plasticity behaviors,which can be modulated by electrical and optical inputs,achieving a significant reduction in operating voltage and an expanded range of tunable conductance states.The memristor exhibited key features of optically modulated biological synapse and brain-inspired learning and memory characteristics at mV-level voltage while integrating photodetection,memo-ry,and processing functions into a single compact device.Additionally,this organic synaptic array was applied to image recognition and memory tasks in the human visual neural system.The promising results provide important in-sights for the design of next-generation low-power and high-performance organic neuromorphic devices.
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