title: Growth of large-area and highly crystalline MoS2 thin layers on insulating substrates.
abstract: The two-dimensional layer of molybdenum disulfide (MoS(2)) has recently attracted much interest due to its direct-gap property and potential applications in optoelectronics and energy harvesting. However, the synthetic approach to obtain high-quality and large-area MoS(2) atomic thin layers is still rare. Here we report that the high-temperature annealing of a thermally decomposed ammonium thiomolybdate layer in the presence of sulfur can produce large-area MoS(2) thin layers with superior electrical performance on insulating substrates. Spectroscopic and microscopic results reveal that the synthesized MoS(2) sheets are highly crystalline. The electron mobility of the bottom-gate transistor devices made of the synthesized MoS(2) layer is comparable with those of the micromechanically exfoliated thin sheets from MoS(2) crystals. This synthetic approach is simple, scalable, and applicable to other transition metal dichalcogenides. Meanwhile, the obtained MoS(2) films are transferable to arbitrary substrates, providing great opportunities to make layered composites by stacking various atomically thin layers.
authors.affiliation: Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.
authors.forename: Keng-Ku
authors.initials: KK
authors.lastname: Liu
authors.forename: Wenjing
authors.initials: W
authors.lastname: Zhang
authors.forename: Yi-Hsien
authors.initials: YH
authors.lastname: Lee
authors.forename: Yu-Chuan
authors.initials: YC
authors.lastname: Lin
authors.forename: Mu-Tung
authors.initials: MT
authors.lastname: Chang
authors.forename: Ching-Yuan
authors.initials: CY
authors.lastname: Su
authors.forename: Chia-Seng
authors.initials: CS
authors.lastname: Chang
authors.forename: Hai
authors.initials: H
authors.lastname: Li
authors.forename: Yumeng
authors.initials: Y
authors.lastname: Shi
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Chao-Sung
authors.initials: CS
authors.lastname: Lai
authors.forename: Lain-Jong
authors.initials: LJ
authors.lastname: Li
mesh_terms: D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D008982:Molybdenum / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D008567:Membranes, Artificial; D013440:Sulfides; D008982:Molybdenum