Controlling sulfurization of 2D Mo_(2)C crystal for Mo_(2)C/MoS_(2)-based memristor and artificial synapse  

作　　者：Xin Tang Leilei Yang Junhua Huang Wenjun Chen Baohua Li Shaodian Yang Rongliang Yang Zhiping Zeng Zikang Tang Xuchun Gui 

机构地区：[1]State Key Laboratory of Optoelectronic Materials and Technologies,School of Electronics and Information Technology,Sun Yat-sen University,Guangzhou 510275,China [2]Department of physics,Guangxi Minzu University,Nanning 530006,China [3]School of Electronic Information Engineering,Foshan University,Foshan 528000,P.R.China [4]School of Materials Science and Engineering,Sun Yat-sen University,Guangzhou 510275,China [5]Institute of Applied Physics and Materials Engineering,University of Macao,Avenida da Universidade,Taipa,Macao 999078,China

出　　处：《npj Flexible Electronics》2022年第1期917-924,共8页npj-柔性电子（英文）

基　　金：financially supported by the National Natural Science Foundation of China (grant no.52072415);Guangdong Basic and Applied Basic Research Foundation (grant nos.2021A1515012387,and 2021A1515110980)。

摘　　要：Owing to the conductance-adjustable performance,the emerging two-terminal memristors are promising candidates for artificial synapses and brain-spired neuromorphic computing.Although memristors based on molybdenum disulfide(MoS_(2))have displayed outstanding performance,such as thermal stability and high energy efficiency,reports on memristors based on MoS_(2) as the functional layer to simulate synaptic behavior are limited.Herein,a homologous Mo_(2)C/MoS_(2)-based memristor is prepared by partially sulfuring two-dimensional Mo_(2)C crystal.The memristor shows good stability,excellent retention(~104 s)and endurance(>100 cycles),and a high ON/OFF ratio(>10^(3)).Moreover,for comprehensively mimicking biological synapses,the essential synaptic functions of the device are systematically analyzed,including paired-pulse facilitation(PPF),short-term plasticity(STP),long-term plasticity(LTP),long-term depression(LTD),and the transitions from STP to LTP.Notably,this artificial synapse could keep a highlevel stable memory for a long time(60 s)after repeated stimulation.These results prove that our device is highly desirable for biological synapses,which show great potential for application in future high-density storage and neuromorphic computing systems.

关 键 词：artificial SULFUR stability 

分 类 号：TB383[一般工业技术—材料科学与工程]