High performance photodetector based on few-layer MoTe_(2)/CdS_(0.42)Se_(0.58) flake heterojunction  

作　　者：Ran Ma Qiuhong Tan Peizhi Yang Yingkai Liu Qianjin Wang 

机构地区：[1]College of Physics and Electronic Information,Yunnan Normal University,Kunming 650500,China [2]Yunnan Provincial Key Laboratory for Photoelectric Information Technology,Yunnan Normal University,Kunming 650500,China [3]Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials,Ministry of Education,Yunnan Normal University,Kunming 650500,China

出　　处：《Frontiers of physics》2024年第4期91-101,共11页物理学前沿（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.11864046 and 11764046);the Basic Research Program of Yunnan Province(Nos.202001AT070064 and 202101AT070124);the Spring City Plan(Highlevel Talent Promotion and Training Project of Kunming)(No.2022SCP005);Yunnan Expert Workstation(No.202205AF150008).

摘　　要：Two-dimensional(2D)transition metal dichalcogenides have been extensively studied due to their fascinating physical properties for constructing high-performance photodetectors.However,their relatively low responsivities,current on/off ratios and response speeds have hindered their widespread application.Herein,we fabricated a high-performance photodetector based on few-layer MoTe_(2) and CdS_(0.42)Se_(0.58) flake heterojunctions.The photodetector exhibited a high responsivity of 7221 A/W,a large current on/off ratio of 1.73×10^(4),a fast response speed of 90/120μs,external quantum efficiency(EQE)reaching up to 1.52×10^(6)%and detectivity(D*)reaching up to 1.67×10^(15) Jones.The excellent performance of the heterojunction photodetector was analyzed by a photocurrent mapping test and first-principle calculations.Notably,the visible light imaging function was successfully attained on the MoTe_(2)/CdS_(0.42)Se_(0.58) photodetectors,indicating that the device had practical imaging application prospects.Our findings provide a reference for the design of ultrahighperformance MoTe_(2)-based photodetectors.

关 键 词：PHOTODETECTOR MoTe_(2) HETEROJUNCTION visible light imaging first-principles calculations 

分 类 号：TN15[电子电信—物理电子学]