title: Kinetic Nature of Grain Boundary Formation in As-Grown MoS2 Monolayers.
abstract: Grain boundaries in as-grown polycrystalline MoS2 monolayers are revealed by second-harmonic-generation microscopy. Through the anisotropic polarization pattern and phase interference at the grain boundary, grain edge termination and boundary types are identified. Statistical analysis on hundreds of grains shows that grain-boundary formation is driven by kinetics and can be nicely described by the edge attachment growth model.
authors.affiliation: State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (MOE), Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Fudan University, Shanghai, 200433, China.
authors.forename: Jingxin
authors.initials: J
authors.lastname: Cheng
authors.affiliation: State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (MOE), Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Fudan University, Shanghai, 200433, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Jiang
authors.affiliation: Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China.
authors.forename: Qingqing
authors.initials: Q
authors.lastname: Ji
authors.affiliation: Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China.|Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Surface Physics, Key Laboratory of Computational Physical Sciences (MOE), Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Fudan University, Shanghai, 200433, China.
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Li
authors.affiliation: State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (MOE), Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Fudan University, Shanghai, 200433, China.
authors.forename: Yuwei
authors.initials: Y
authors.lastname: Shan
authors.affiliation: Center for Nanochemistry (CNC), Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China.|Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Surface Physics, Key Laboratory of Computational Physical Sciences (MOE), Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Fudan University, Shanghai, 200433, China.
authors.forename: Xingao
authors.initials: X
authors.lastname: Gong
authors.affiliation: State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (MOE), Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Fudan University, Shanghai, 200433, China.
authors.forename: Weitao
authors.initials: W
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (MOE), Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Fudan University, Shanghai, 200433, China.
authors.forename: Shiwei
authors.initials: S
authors.lastname: Wu
keywords: chemical vapor deposition; grain boundaries; molybdenum disulfide; polycrystalline; second harmonic generation