Salt-assisted growth and ultrafast photocarrier dynamics of large-sized monolayer ReSe2

作     者：Shaolong Jiang Jin Yang Yuping Shi Jing Zhao Chunyu Xie Liyun Zhao Jiatian Fu Pengfei Yang Yahuan Huan Qin Xie Huachao Jiang Qing Zhang Xianlong Wang Fuhai Su Yanfeng Zhang Shaolong Jiang;Jin Yang;Yuping Shi;Jing Zhao;Chunyu Xie;Liyun Zhao;Jiatian Fu;Pengfei Yang;Yahuan Huan;Qin Xie;Huachao Jiang;Qing Zhang;Xianlong Wang;Fuhai Su;Yanfeng Zhang

作者机构：Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing100871China Key Laboratory of Materials PhysicsInstitute of Solid State PhysicsChinese Academy of SciencesHefei230031China University of Science and Technology of ChinaHefei230026China Center for Nanochemistry(CNC)Beijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2020年第13卷第3期

页      面：667-675页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

基　　金：The work was supported by the National Key Research and Development Program of China(Nos.2018YFA0703700,2017YFA0304600,and 2017YFA0205700) the National Natural Science Foundation of China(Nos.51861135201,21473001,11774354,11674329,and 51727806) Beijing Natural Science Foundation(No.2192021) the Project funded by China Postdoctoral Science Foundation(No.2018M640023) Chinese Academy of Science(No.YZJJ201705) Open Research Fund Program of the State Key Laboratory of Low-dimensional Quantum Physics(No.KF201907) Start-up Funding of Peking University 

主　　题：ReSe2 chemical vapor deposition sodium chloride large size ultrafast photocarrier dynamics 

摘      要：Owing to its anisotropic optical and electrical properties,rhenium diselenide(ReSe2)has garnered considerable attention recently as a candidate material for polarization-sensitive ***,the direct and controllable synthesis of large-sized ReSe2 with a uniform thickness is still a great ***,we have refined the synthesis method to obtain uniform monolayer ReSe2 flakes with a size of up to^106μm on sapphire via an ambient-pressure chemical vapor deposition technique using Na promoter from sodium ***,optical pump-probe spectroscopy revealed a fast switching from saturable absorption(SA)to absorption enhancement(AE)in subpicosecond time scale,followed by a slower decay induced by exciton ***,both AE and SA signals exhibited clear angular dependence with a periodicity of 180°,which reflected the dichroism in nonlinear absorption *** addition,the photocarrier dynamics including free-carrier transport and subpicosecond relaxation due to exciton formation or surface trapping was probed using time resolved terahertz *** believe that our study serves as a reference for atomically controlled synthesis of large-sized ReSe2 and provides useful insights on its optoelectronic properties for novel device applications.