Scrolling bilayer WS2/MoS2 heterostructures for high-performance photo-detection  

作　　者：Lin Wang Qiuyan Yue Chengjie Pei Huacheng Fan Jie Dai Xiao Huang Hai Li Wei Huang 

机构地区：[1]Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials,Nanjing Tech University,Nanjing 211816,China [2]Shaanxi Institute of Flexible Electronics(SIFE),Northwestern Polytechnical University,Xian 710072,China

出　　处：《Nano Research》2020年第4期959-966,共8页纳米研究（英文版）

基　　金：This work was supported by the National Key Research and Development Program of China(No.2017YFB1002900);the National Natural Science Foundation of China(Nos.21571101,51322202,51832001);the Natural Science Foundation of Jiangsu Province in China(No.BK20161543);the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.15KJB430016).

摘　　要：Recently,transition metal dichalcogenides(TMDCs)nanoscrolls have exhibited unique electronic and optical properties due to their spiral tubular structures,which are formed by rolling up monolayer TMDCs nanosheets.Inspired by the excellent physical and chemical properties of TMDCs van der Waals heterostructures(vdWHs),it is highly desirable to scroll TMDCs vdWHs for potential optoelectronic applications.In this work,WS2/MoS2 vdWHs nanoscrolls were massively prepared by dropping aqueous alkaline droplet on chemical vapor deposition(CVD)-grown bilayer WS2/MoS2 vdWHs,which were formed by growing monolayer WS2 islands on top of monolayer MoS2 nanosheets simultaneously.The optical microscopy(OM),atomic force microscopy(AFM),ultralow frequency(ULF)Raman spectroscopy and transmission electron microscopy(TEM)were utilized to characterize the WS2/MoS2 vdWHs nanoscrolls.As-obtained WS2/MoS2 vdWHs nanoscrolls exhibited new ULF breathing mode as well as shear mode peaks due to the strong interlayer interaction.Notably,the photosensitivities of WS2/MoS2 vdWHs nanoscrolls-based devices were about ten times higher than those of WS2/MoS2 vdWHs-based devices under blue,green and red lasers,respectively,which could be attributed to the ultrafast charge transfer at alternative WS2/MoS2 and MoS2/WS2 multi-interfaces in scrolled structure.Our work suggested that TMDCs vdWHs scrolls could be promising candidates for optoelectronic applications.

关 键 词：van der Waals heterostmctures chemical vapor deposition WS2/M0S2 nanoscroll PHOTOSENSITIVITY aqueous alkaline droplet multi-interfaces 

分 类 号：TB383[一般工业技术—材料科学与工程]