title: Layer Dependence and Light Tuning Surface Potential of 2D MoS2on Various Substrates.
abstract: Here surface potential of chemical vapor deposition (CVD) grown 2D MoS2with various layers is reported, and the effect of adherent substrate and light illumination on surface potential of monolayer MoS2are investigated. The surface potential of MoS2on Si/SiO2substrate decreases from 4.93 to 4.84 eV with the increase in the number of layer from 1 to 4 or more. Especially, the surface potentials of monolayer MoS2are strongly dependent on its adherent substrate, which are determined to be 4.55, 4.88, 4.93, 5.10, and 5.50 eV on Ag, graphene, Si/SiO2, Au, and Pt substrates, respectively. Light irradiation is introduced to tuning the surface potential of monolayer MoS2, with the increase in light intensity, the surface potential of MoS2on Si/SiO2substrate decreases from 4.93 to 4.74 eV, while increases from 5.50 to 5.56 eV on Pt substrate. The I-V curves on vertical of monolayer MoS2/Pt heterojunction show the decrease in current with the increase of light intensity, and Schottky barrier height at MoS2/Pt junctions increases from 0.302 to 0.342 eV. The changed surface potential can be explained by trapped charges on surface, photoinduced carriers, charge transfer, and local electric field.
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.|Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.|Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Qi
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.|Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
authors.forename: Minxuan
authors.initials: M
authors.lastname: Xu
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.|Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
authors.forename: Jiankun
authors.initials: J
authors.lastname: Xiao
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.|Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
authors.forename: Yuliang
authors.initials: Y
authors.lastname: Xu
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.|Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
authors.forename: Xiankun
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.|Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
authors.forename: Shuo
authors.initials: S
authors.lastname: Liu
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.|Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhang
keywords: 2D materials; MoS2; light illumination; surface potential