In-depth analysis of core-shell filaments in nonvolatile NbO_(x) memristive device as an artificial synapse for multifunctional bionic applications  

作　　者：JIANG Bei KE ShanWu TAO ZiPei JIN YaoYao MENG JiaHao SONG XingJuan XIAO YongYue JIANG Li WANG JinZhao CHEN Yong LI YueBin WEN Xin YE Cong 

机构地区：[1]School of Microelectronics,Key Laboratory of Intelligent Sensing System and Security,Ministry of Education,Hubei University,Wuhan 430062,China [2]Belt and Road Joint Laboratory on Measurement and Control Technology,Huazhong University of Science and Technology,Wuhan 430074,China [3]School of Science,Hubei University of Technology,Wuhan 430068,China [4]Faculty of Chemical Technology and Engineering,West Pomeranian University of Technology in Szczecin,Szczecin 71-065,Poland

出　　处：《Science China(Technological Sciences)》2023年第12期3596-3603,共8页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.62274058,62104065);the Open Project of China-Poland Belt and Road Joint Laboratory of Measurement and Control Technology (Grant No.MCT202104);the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDB44000000);the Hubei Province Key Research and Development Program (Grant No.2022BAA020);the Wuhan Key Research and Development Program (Grant Nos.2022012202015055,2023010402010612)。

摘　　要：As a key building block of the biological cortex,synapses are powerful information processing units that enable highly complex nonlinear computations.The realization of artificial synapses with similar capabilities has important implications for building intelligent,neuromorphic systems.Here,we demonstrate an artificial synapse based on NbO_(x) nonvolatile memristor to mimic multifunctional bionic applications such as nociceptor and associative learning.Combined experimental characterization with COMSOL simulation,the traditional resistance switching characteristics,which are the decisive factor for the synapse properties are in-depth analyzed.It can be proposed that the I-V characteristics of Pt/NbO_(x)/TiN memristor are governed by core-shell filaments consisting of the shell region of sub-stoichiometric Nb_(2)O_(5-δ)and the core of NbO_(2).On the basis of the core-shell filament model,it can be reasonably explained that Ohmic conduction and Poole-Frenkel conduction take turns to dominate the current flowing in the memristive device,leading to the zigzag evolution of current during the operation process of NbO_(x)-based device.The simulations of synaptic plasticity,including long-term potentiation/depression(LTP/LTD),paired-pulse facilitation(PPF),and spike-timing-dependent plasticity(STDP),exhibiting that the NbO_(x) can be utilized for an artificial synapse.Furthermore,bionic functions such as hyperalgesia and allodynia of a nociceptor and a series of associative learning behaviors in Pavlovian dog experiment are mimicked,illustrating that the Pt/NbO_(x)/TiN have great potential for highly simplified artificial neural network applications.

关 键 词：memristor core-shell filament synaptic plasticity NOCICEPTOR associative learning 

分 类 号：TN60[电子电信—电路与系统]