Graphene has high light transmittance of 97.7％and ultrafast carrier mobility,which means it has attracted widespread attention in two-dimensional materials.However,the optical absorptivity of single-layer graphene is only 2.3％,and the corresponding photoresponsivity is difficult to produce at normal light irradiation.And the low on-off ratio resulting from the zero bandgap makes it unsuitable for many electronic devices,hindering potential development.The graphene-based heterojunction composed of graphene and other materials has outstanding optical and electrical properties,which can mutu-ally modify the defects of both the graphene and material making it then suitable for optoelectronic devices.In this review,the advantages of graphene-based heterojunctions in the enhancement of the performance of photodetectors are reviewed.Firstly,we focus on the photocurrent generation mechanism of a graphene-based heterojunction photodetector,especially photovoltaic,photoconduction and photogating effects.Secondly,the classification of graphene-based heterojunctions in different directions is summarized.Meanwhile,the latest research progress of graphene-transition metal dichalcogenide(TMD)heterojunction photodetectors with excellent performance in graphene-based heterostructures is introduced.Finally,the difficulties faced by the existing technologies of graphene-based photodetectors are discussed,and further prospects are proposed.

Haiting Yao;Xin Guo;Aida Bao;Haiyang Mao;Youchun Ma;Xuechao Li

National Key Laboratory for Electronic Measurement Technology,North University of China,Taiyuan 030051,China;Institute of Microelectronics of Chinese Academy of Sciences,Beijing 100029,China

中国物理B（英文版）

[1]Haiting Yao;Xin Guo;Aida Bao;Haiyang Mao;Youchun Ma;Xuechao Li-.Graphene-based heterojunction for enhanced photodetectors)[J].中国物理B（英文版）,2022(03):106-118

mutu,photoconduction

Graphene,enhanced,photodetectors,has,high,light,transmittance,ultrafast,carrier,mobility,which,means,attracted,widespread,attention,two,dimensional,materials,However,optical,absorptivity,single,layer,graphene,only,corresponding,photoresponsivity,produce,normal,irradiation,And,low,off,resulting,from,zero,bandgap,makes,unsuitable,many,devices,hindering,potential,development,composed,other,outstanding,electrical,properties,can,modify,defects,both,making,then,optoelectronic,In,this,advantages,heterojunctions,enhancement,performance,are,reviewed,Firstly,focus,photocurrent,generation,mechanism,especially,photovoltaic,photogating,effects,Secondly,classification,different,directions,summarized,Meanwhile,latest,research,progress,transition,metal,dichalcogenide,TMD,excellent,heterostructures,introduced,Finally,difficulties,faced,by,existing,technologies,discussed,further,prospects,proposed

0.57294