title: Large-Scale Synthesis of a Uniform Film of Bilayer MoS2 on Graphene for 2D Heterostructure Phototransistors.
abstract: The large-scale synthesis of atomically thin, layered MoS2/graphene heterostructures is of great interest in optoelectronic devices because of their unique properties. Herein, we present a scalable synthesis method to prepare centimeter-scale, continuous, and uniform films of bilayer MoS2 using low-pressure chemical vapor deposition. This growth process was utilized to assemble a heterostructure by growing large-scale uniform films of bilayer MoS2 on graphene (G-MoS2/graphene). Atomic force microscopy, Raman spectra, and transmission electron microscopy characterization demonstrated that the large-scale bilayer MoS2 film on graphene exhibited good thickness uniformity and a polycrystalline nature. A centimeter-scale phototransistor prepared using the G-MoS2/graphene heterostructure exhibited a high responsivity of 32 mA/W with good cycling stability; this value is 1 order of magnitude higher than that of transferred MoS2 on graphene (2.5 mA/W). This feature results from efficient charge transfer at the interface enabled by intimate contact between the grown bilayer MoS2 (G-MoS2) and graphene. The ability to integrate multilayer materials into atomically thin heterostructures paves the way for fabricating multifunctional devices by controlling their layer structure.
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin University , Tianjin 300072, P.R. China.
authors.forename: Chuanmeng
authors.initials: C
authors.lastname: Chen
authors.affiliation: College of Precision Instrument and Optoelectronics Engineering, State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University , Tianjin 300072, P.R. China.
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Feng
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin University , Tianjin 300072, P.R. China.
authors.forename: Yiyu
authors.initials: Y
authors.lastname: Feng
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin University , Tianjin 300072, P.R. China.
authors.forename: Yuchen
authors.initials: Y
authors.lastname: Yue
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin University , Tianjin 300072, P.R. China.
authors.forename: Chengqun
authors.initials: C
authors.lastname: Qin
authors.affiliation: College of Precision Instrument and Optoelectronics Engineering, State Key Laboratory of Precision Measuring Technology & Instruments, Tianjin University , Tianjin 300072, P.R. China.
authors.forename: Daihua
authors.initials: D
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin University , Tianjin 300072, P.R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Feng
keywords: bilayer MoS2; graphene; heterostructure; large-scale; uniformity