Niobium doping induced mirror twin boundaries in MBE grown WSe2 monolayers

作     者：Bo Wang Yipu Xia Junqiu Zhang Hannu-Pekka Komsa Maohai Xie Yong Peng Chuanhong Jin Bo Wang;Yipu Xia;Junqiu Zhang;Hannu-Pekka Komsa;Maohai Xie;Yong Peng;Chuanhong Jin

作者机构：Key Laboratory for Magnetism and Magnetic Materials of Ministry of EducationSchool of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China State Key Laboratory of Silicon MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310024China Physics DepartmentThe University of Hong KongPokfulam RoadHong Kong 999077China Department of Applied PhysicsAalto University00076 AaltoFinland Hunan Institute of Advanced Sensing and Information TechnologyXiangtan UniversityXiangtan 411201China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2020年第13卷第7期

页      面：1889-1896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 National Natural Science Foundation of China(Nos.51761165024,51772265,and 61721005) the Zhejiang Provincial Natural Science Foundation(No.D19E020002) the 111 project(No.Bl6042) Zhejiang University Education Foundation Global Partnership Fund M.H.X.acknowledges the financial support from a Collaborative Research Fund(C7036-17W) a General Research Grant(No.17327316)from the Research Grant Cuncil,Hong Kong special Administrative Region,China We also acknowledge the support from the NSFC/RGC joint research grant(Nos.N_HKU732/17 and 51761165024) H.P.K.acknowledges financial support from the Academy of Finland through Project No.31105&and CSC-IT Center for Science Ltd.for generous grants of computer time 

主　　题：mirror twin boundaries niobium doping molecular beam epitaxy transition metal dichalcogenides niobium tungsten diselenide 

摘      要：Mirror twin boundary(MTB)brings unique one-dimensional(1D)physics and properties into two-dimensional(2D)transition metal dichalcogenides(TMDCs),but they were rarely observed in non-Mo-based ***,by post growth Nb doping,high density 4|4E-W and 4|4P-Se mirror twin boundaries(MTBs)were introduced into molecular beam epitaxy(MBE)grown WSe2 *** them,4|4E-W MTB with a novel structure was discovered experimentally for the first time,while 4|4P-Se MTBs present a random permutations of W and Nb,forming a 1D alloy *** between the doped and non-doped WSe2 confirmed that Nb dopants are essential for MTB ***,quantitative statistics reveal the areal density of MTBs is directly proportional to the concentration of Nb *** unravel the injection pathway of Nb dopants,first-principles calculations about a set of formation energies for excess Nb atoms with different configurations were conducted,based on which a model explaining the origin of MTBs introduced by excess metal was *** conclude that the formation of MTBs is mainly driven by the collective evolution of excess Nb atoms introduced into the lttice of host WSe2 crystal and subsequent displacement of metal atoms(W or Nb).This study provides a novel way to tailor the MTBs in 2D TMDC materials via proper metal doping and presents new opportunities for exploring the intriguing properties.