Picosecond electrical response in graphene/MoTe_(2) heterojunction with high responsivity in the near infrared region

作     者：Zhouxiaosong Zeng Kai Braun Cuihuan Ge Martin Eberle Chenguang Zhu Xingxia Sun Xin Yang Jiali Yi Delang Liang Yufan Wang Lanyu Huang Ziyu Luo Dong Li Anlian Pan Xiao Wang Zhouxiaosong Zeng;Kai Braun;Cuihuan Ge;Martin Eberle;Chenguang Zhu;Xingxia Sun;Xin Yang;Jiali Yi;Delang Liang;Yufan Wang;Lanyu Huang;Ziyu Luo;Dong Li;Anlian Pan;Xiao Wang

作者机构：School of Physics and ElectronicsHunan UniversityChangsha 410082China Institute of Physical and Theoretical Chemistry and LISA+University of TübingenAuf der Morgenstelle 18Tübingen 72076Germany Key Laboratory for Micro-Nano Physics and Technology of Hunan ProvinceCollege of Materials Science and EngineeringHunan UniversityChangsha 410082China 

出 版 物：《Fundamental Research》 (自然科学基础研究（英文版）)

年 卷 期：2022年第2卷第3期

页      面：405-411页

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：This work was supported by the National Natural Science Foundation of China(Grants No.52022029,91850116,51772084,and U19A2090) the Sino-German Center for Research Promotion(Grant No.GZ1390) the Hunan Provincial Natural Science Foundation of China(Grants No.2018RS3051 and 2019XK2001) 

主　　题：Two-dimension material Graphene/MoTe_(2)heterojunction Near infrared photodetector Scanning photocurrent microscopy Time-resolved photocurrent 

摘      要：Understanding the fundamental charge carrier dynamics is of great significance for photodetectors with both high speed and high *** based on two-dimensional(2D)transition metal dichalcogenides can exhibit picosecond photoresponse ***,2D materials naturally have low absorption,and when increasing thickness to gain higher responsivity,the response time usually slows to nanoseconds,limiting their photodetection ***,by taking time-resolved photocurrent measurements,we demonstrated that graphene/MoTe_(2) van der Waals heterojunctions realize a fast 10 ps photoresponse time owing to the reduced average photocurrent drift time in the heterojunction,which is fundamentally distinct from traditional Dirac semimetal photodetectors such as graphene or Cd_(3)As_(2) and implies a photodetection bandwidth as wide as 100 ***,we found that an additional charge carrier transport channel provided by graphene can ef-fectively decrease the photocurrent recombination loss to the entire device,preserving a high responsivity in the near-infrared *** study provides a deeper understanding of the ultrafast electrical response in van der Waals heterojunctions and offers a promising approach for the realization of photodetectors with both high responsivity and ultrafast electrical response.