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High gain,broadband p-WSe_(2)/n-Ge van der Waals heterojunction phototransistor with a Schottky barrier collector

查看全文 作　　者：Shuo [1]Li;Qiang [1]Wu;Haokun [1]Ding;Songsong [1]Wu;Xinwei [1]Cai;Rui [1]Wang;Jun [1]Xiong;Guangyang [1]Lin;Wei [1]Huang;Songyan [1]Chen;Cheng [1]Li 高影响力作者 机构地区：[1]Department of Physics,Semiconductor Photonics Research Center,Xiamen University,Xiamen 361005,China高影响力机构 出　　处：《Nano Research》索引2023年第16卷第4期,共7页高影响力期刊 基　　金：supported by the National Key Research and Development Program of China(No.2018YFB2200103);the National Natural Science Foundation of China(No.62074134). 摘　　要：Mixed-dimensional van der Waals(vdW)heterostructures based on two-dimensional transition metal dichalcogenides and threedimensional semiconductors have led to a new era in next-generation optoelectronics due to the high-quality interfaces and energy band complementation,especially in broadband photodetectors which can be used for all-weather navigation,object identification,etc.However,the reported photodetectors conventionally operated in photodiode mode with low responsivity and a narrow response spectrum.In this study,we report a p-WSe_(2)/n-Ge vdW heterojunction phototransistor with a Schottky barrier collector on n-Ge for broadband photodetection.Large hole/electron injection ratio from p-WSe_(2)/n-Ge heterojunction under forward bias due to their large bandgap offset renders the high photocurrent gain,while the Ge Schottky barrier limits the dark current.The responsivities of the phototransistor at 1.0 V emitter-collector bias are 55,95,and 120 A·W−1 at 405,1,310,and 1,550 nm,respectively,which is superior to that of the corresponding p-WSe_(2)/n-Ge photodiodes.The phototransistor shows a high photocurrent gain of 80,a specific detectivity of 1011 Jones,as well as a fast response time of 290μs at 1,550 nm.The results suggest that the novel phototransistor being implemented with complementary metal-oxide-semiconductor processing is an ideal strategy for high-performance broadband photodetection. 关 键 词：BROADBAND van der Waals(vdW)heterojunction Schottky junction PHOTOTRANSISTOR
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