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Two-dimensional (2D) transition metal dichalcogenides (TMDs), especially MoS2and WS2 recently attract extensive attentions due to their rich physics andgreat potential applications. Superior to graphene, MS2 (M = Mo/W) monolayershave a native direct energy gap in visible frequency range. This promises greatfuture of MS2 for optoelectronics. To exploit properties and further developmore applications, producing large-scale single crystals of MS2 by a facilemethod is highly demanded. Here, we report the synthesis of large-scaletriangular single crystals of WS2 monolayer from a chemical vapor depositionprocess and systematic optical studies of such WS2 monolayers. The observationsof high yield of light emission and valley-selective circular dichroismexperimentally evidence the high optical quality of the WS2 monolayers. Thiswork paves the road to fabricate large-scale single crystalline 2Dsemiconductors and study their fundamentals. It must be very meaningful forexploiting great potentials of WS2 for future optoelectronics.

Synthesis and optical properties of large-scale single-crystalline two-dimensional semiconductor WS2 monolayer from chemical vapor deposition