Ultra-low power MoS_(2)optoelectronic synapse with wavelength sensitivity for color target recognition  

作　　者：Bo WEI Yabo CHEN Xiaotong HAN Yan KANG Bujia LIANG Cheng LI Xiaokuo YANG Liang FANG Yuanxi PENG 

机构地区：[1]Institute for Quantum Information&State Key Laboratory of High Performance Computing,College of Computer,National University of Defense Technology,Changsha 410073,China [2]Fundamentals Department,Air Force Engineering University,Xi’an 710051,China [3]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China [4]Institute of Quantum Information Science and Technology,College of Science,National University of Defense Technology,Changsha 410073,China [5]College of Computer,National University of Defense Technology,Changsha 410073,China

出　　处：《Science China(Information Sciences)》2025年第4期183-192,共10页中国科学(信息科学)(英文版)

基　　金：supported by National Natural Science Foundation of China(Grant Nos.61832007,62274183);Key Program of National Natural Science Foundation of China(Grant No.U22A2027);National Key Research and Development Program of China(Grant No.2023YFB4502100)。

摘　　要：Optoelectronic synapses that integrate visual perception and pre-processing hold significant potential for neuromorphic vision systems(NVSs).However,due to a lack of wavelength sensitivity,existing NVS mainly focuses on gray-scale image processing,making it challenging to recognize color images.Additionally,the high power consumption of optoelectronic synapses,compared to the 10 fJ energy consumption of biological synapses,limits their broader application.To address these challenges,an energy-efficient NVS capable of color target recognition in a noisy environment was developed,utilizing a MoS_(2) optoelectronic synapse with wavelength sensitivity.Benefiting from the distinct photon capture capabilities of 450,535,and 650 nm light,the optoelectronic synapse exhibits wavelength-dependent synaptic plasticity,including excitatory postsynaptic current(EPSC),paired-pulse facilitation(PPF),and long-term plasticity(LTP).These properties can effectively mimic the visual memory and color discrimination functions of the human vision system.Results demonstrate that the NVS,based on MoS_(2)optoelectronic synapses,can eliminate the color noise at the sensor level,increasing color image recognition accuracy from 50% to 90%.Importantly,the optoelectronic synapse operates at a low voltage spike of 0.0005 V,consuming only 0.075 fJ per spike,surpassing the energy efficiency of both existing optoelectronic and biological synapses.This ultra-low power,color-sensitive device eliminates the need for color filters and offers great promise for future deployment in filter-free NVS.

关 键 词：optoelectronic synapse neuromorphic vision system color recognition 2D materials image pre-processing 

分 类 号：TN29[电子电信—物理电子学]