Highly efficient tunable photodetector with a bipolar response in van der Waals heterojunctions

SHI ChaoFan ¹ZHANG Shi ²XIAO KeNing ¹ZHANG LiBo ²HAN Li ²ZHU YuLin ¹TANG WeiWei ¹LIU ChangLong ¹LI GuanHai ²CHEN XiaoShuang²

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作者信息

1. College of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China
2. College of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China;State Key Laboratory of Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China
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Abstract

The heterojunction integration of two-dimensional(2D)materials via van der Waals(vdW)forces,unencumbered by lattice and processing constraints,constitutes an efficacious approach to enhance the overall optoelectronic performance of photodetectors,due to an assortment of distinctive light-matter interactions.Nonetheless,vdW heterojunction photodetectors based on transition metal dichalcogenides(TMDs)face an inevitable trade-off between low dark currents and high responsivity,curtailing the application potential of myriad novel optoelectronic components in sensing,spectral,and communication systems.In this study,we present the successful actualization of a highly sensitive,self-powered,and gate-tunable bipolar response photodetector.The mechanisms underlying photocurrent generation were scrutinized via bias-,power-,and position-dependent mapping photo-response measurements,identifying the photovoltaic effect,which is attributable to the Schottky junction's built-in electric field,as the predominant mechanism.The prototype Au-WS2-graphene photodetector exhibits a remarkable light on/off ratio of 1.2 x 106,a specific detectivity of 6.12 × 1011 cmHz1/2W 1 with 20 μs response time at 638 nm.The wide gate-tunable responsivity provides an adjustability scope,ranging from 0.9 to 3.1 A W 1.Notably,the device demonstrates an exceptional linear photocurrent response,with a linear dynamic range(LDR)value approximating 130 dB,which significantly surpasses that of other photodetectors based on TMDs.

Key words

WS2/graphene/van der Waals heterojunction/gate-tunable/bipolar response

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基金项目

National Natural Science Foundation of China(62305077)

National Natural Science Foundation of China(62222514)

National Natural Science Foundation of China(61991440)

National Natural Science Foundation of China(62005249)

Youth Innovation Promotion Association of Chinese Academy of Sciences(Y2021070)

Strategic Priority Research Program of Chinese Academy of Sciences(XDB43010200)

Shanghai Rising-Star Program(20QA1410400)

Shanghai Science and Technology Committee(23ZR1482000)

Shanghai Science and Technology Committee(20JC1416000)

Shanghai Science and Technology Committee(22JC1402900)

Natural Science Foundation of Zhejiang Province(LR22F050004)

Shanghai Municipal Science and Technology Major Project(2019SHZDZX01)

Hangzhou West Science and Technology Innovation Corridor Youth Project()

Excellent Postdoctoral Research Projects of Zhejiang Province(ZJ2021019)

Open Fund of State Key Laboratory of Infrared Physics(SITP-NLIST-YB-2023-13)

Zhejiang Provincial Natural Science Foundation(LQ20F050005)

Westlake Center for Micro/Nano Fabrication()

出版年

2024

中国科学:技术科学(英文版)

中国科学院

中国科学:技术科学(英文版)

CSTPCDEI

影响因子：1.056

ISSN：1674-7321

参考文献量38

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