Nanowatt-level optoelectronic GaN-based heterostructure artificial synaptic device for associative learning and neuromorphic computing  

作　　者：Teng Zhan Jianwen Sun Jin Lin Banghong Zhang Guanwan Liao Zewen Liu Junxi Wang Jinmin Li Xiaoyan Yi 

机构地区：[1]Research and Development Center for Wide Bandgap Semiconductors,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Integrated Circuits,Tsinghua University,Beijing 100084,China [4]Beijing Wanlongjingyi Technology Co.,Ltd.,Beijing 101318,China

出　　处：《Journal of Semiconductors》2025年第2期114-120,共7页半导体学报(英文版)

基　　金：supported by the National Key R&D Program of China(2021YFB3601000,2021YFB3601004);the National Key R&D Program of China(2022YFB3604702);the Chinese Academy of Sciences.

摘　　要：In recent years,research focusing on synaptic device based on phototransistors has provided a new method for asso-ciative learning and neuromorphic computing.A TiO_(2)/AlGaN/GaN heterostructure-based synaptic phototransistor is fabricated and measured,integrating a TiO_(2)nanolayer gate and a two-dimensional electron gas(2DEG)channel to mimic the synaptic weight and the synaptic cleft,respectively.The maximum drain to source current is 10 nA,while the device is driven at a reverse bias not exceeding-2.5 V.A excitatory postsynaptic current(EPSC)of 200 nA can be triggered by a 365 nm UVA light spike with the duration of 1 s at light intensity of 1.35μW·cm^(-2).Multiple synaptic neuromorphic functions,including EPSC,short-term/long-term plasticity(STP/LTP)and paried-pulse facilitation(PPF),are effectively mimicked by our GaN-based het-erostructure synaptic device.In the typical Pavlov’s dog experiment,we demonstrate that the device can achieve"retraining"process to extend memory time through enhancing the intensity of synaptic weight,which is similar to the working mecha-nism of human brain.

关 键 词：GAN HETEROSTRUCTURE neuromorphic SYNAPTIC OPTOELECTRONIC phototransisitor pavlov 

分 类 号：TN386[电子电信—物理电子学]