Graphene/SrTiO3 interface-based UV photodetectors with high responsivity

作     者：Heng Yue Anqi Hu Qiaoli Liu Huijun Tian Chengri Hu Xiansong Ren Nianyu Chen Chen Ge Kuijuan Jin Xia Guo 岳恒;胡安琪;刘巧莉;田慧军;胡成日;任显松;陈年域;葛琛;金奎娟;郭霞

作者机构：State Key Laboratory for Information Photonics and Optical CommunicationsSchool of Electronic EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2021年第30卷第3期

页      面：540-545页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0803[工学-光学工程] 

基　　金：Project supported by the National Key Research and Development Program of China(Grant Nos.2017YFF0104801 and 2018YFB0406601) the National Natural Science Foundation of China(Grant Nos.61804012 and 11721404) 

主　　题：interface SrTiO3 ultraviolet photodetector high responsivity 

摘      要：Strontium titanate(SrTiO3),which is a crucial perovskite oxide with a direct energy band gap of 3.2 eV,holds great promise for ultraviolet(UV)***,the response performance of the conventional SrTiO3-based photodetectors is limited by the large relative dielectric constant of the material,which reduces the internal electric field for electron-hole pair separation to form a current collected by ***,graphene/semiconductor hybrid photodetectors by van-der-Waals heteroepitaxy method demonstrate ultrahigh sensitivity,which is benefit from the interface junction architecture and then prolonged lifetime of photoexcited ***,a graphene/SrTiO3 interface-based photodetector is demonstrated with an ultrahigh responsivity of 1.2×106 A/W at the wavelength of 325 nm and∼2.4×104 A/W at 261 *** corresponding response time is in the order of∼*** with graphene/GaN interface junctionbased hybrid photodetectors,∼2 orders of magnitude improvement of the ultrahigh responsivity originates from a gain mechanism which correlates with the large work function difference induced long photo-carrier lifetime as well as the low background carrier *** performance of high responsivity and fast response speed facilitates SrTiO3 material for further efforts seeking practical applications.