title: Controllable growth of monolayer MoS2by chemical vapor deposition via close MoO2precursor for electrical and optical applications.
abstract: MoO2is used as a new source material for the growth of large area and high optical quality monolayer MoS2. However, a systematic study of the growth parameters is still missing and large-area growth of discreet single crystals is still challenging. Hereby, we report the shape evolution of monolayer growth of MoS2and develop a methodology to achieve centimeter-scaled discrete MoS2by adopting MoO2as Mo source material in an atmospheric-pressure chemical vapor deposition process. Our results indicate the growth of monolayer MoS2could benefit from the precise control of the introduction time of sulfur and the S/MoO2ratio in experiments. Micro-Raman and photoluminescence spectra confirm the properties of the material. E-beam lithography was utilized to make contact with the as-grown MoS2located at the selective area. The electrical properties of MoS2with different morphologies were compared. In the end, the persistent photoconductivity properties of monolayer MoS2were emphasized and the underlying mechanism was proposed. These studies demonstrate a better understanding of the growth and application of MoS2-based 2D materials.
authors.affiliation: School of Advanced Materials and Nanotechnology, Xidian University, Xi'an 710071, People's Republic of China. Key Laboratory of Wide Band-Gap Semiconductor Technology, Xidian University, Xi'an 710071, People's Republic of China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Xie
authors.forename: Zhan
authors.initials: Z
authors.lastname: Wang
authors.forename: Yongjie
authors.initials: Y
authors.lastname: Zhan
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Ruixue
authors.initials: R
authors.lastname: Wu
authors.forename: Teng
authors.initials: T
authors.lastname: Jiang
authors.forename: Shiwei
authors.initials: S
authors.lastname: Wu
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhao
authors.forename: Tang
authors.initials: T
authors.lastname: Nan
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Ma