High-performance UV detectors based on 2D CVD bismuth oxybromide single-crystal nanosheets
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第13期
论文作者：Long Chen Chengtao Yang Chaoyi Yan
文章页码：100 - 104
摘 要：Two-dimensional（2D） ternary wide-bandgap semiconducting materials have great potential in power device,flexible electronic device,short-wavelength light emitting diodes（LEDs） and photodetectors due to the controllable bandgap,strong light-material interaction,and controlled freedom degree of stoichiometry variation.However,it is still a great challenge to precisely control the growth of high-quality 2D ternary wide-bandgap semiconducting materials due to the variety of components,which hinders their development for practical applications.In this work,high-quality 2D ternary bismuth oxybromide single-crystal nanosheets with a high yield were prepared by space-confined chemical vapor deposition（CVD） method.The devices based on 2D ultrathin BiOBr single-crystal nanoflakes show a high UV detecting performance including low dark current(Idark) of 1.46pA and high re s ponsivity（R）,external quantum efficiency（EQE） and detectivity（D*） of 14.96 A W-1,5460%,and 5.74 x 1010 Jones,respectively,as well as fast response process(τrise=80 ms,τdecay=40 ms).The excellent UV performance can be ascribed to the photogating effect by trapped states,which endow it with great potential for high-performance UV detectors.
Long Chen，Chengtao Yang，Chaoyi Yan
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China
摘 要：Two-dimensional（2D） ternary wide-bandgap semiconducting materials have great potential in power device,flexible electronic device,short-wavelength light emitting diodes（LEDs） and photodetectors due to the controllable bandgap,strong light-material interaction,and controlled freedom degree of stoichiometry variation.However,it is still a great challenge to precisely control the growth of high-quality 2D ternary wide-bandgap semiconducting materials due to the variety of components,which hinders their development for practical applications.In this work,high-quality 2D ternary bismuth oxybromide single-crystal nanosheets with a high yield were prepared by space-confined chemical vapor deposition（CVD） method.The devices based on 2D ultrathin BiOBr single-crystal nanoflakes show a high UV detecting performance including low dark current(Idark) of 1.46pA and high re s ponsivity（R）,external quantum efficiency（EQE） and detectivity（D*） of 14.96 A W-1,5460%,and 5.74 x 1010 Jones,respectively,as well as fast response process(τrise=80 ms,τdecay=40 ms).The excellent UV performance can be ascribed to the photogating effect by trapped states,which endow it with great potential for high-performance UV detectors.
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