Journal
CRYSTAL GROWTH & DESIGN
Volume 18, Issue 2, Pages 1012-1019Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.7b01486
Keywords
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Funding
- National Natural Science Foundation of China [61775201, 11404309, 51402275]
- Fund of Shanghai Science and Technology Foundation [13JC1408800]
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The deep understanding of nucleation and growth mechanisms is fundamental for the precise control of the size, layer number, and crystal quality of two-dimensional (2D) transition-metal dichalcogenides (TMDs) with the chemical vapor deposition (CVD) method. In this work, we present a systematic spectroscopic study of CVD-grown MoS2, and two types of MoS2 flakes have been identified: one type of flake contains a central nanoparticle with the multilayer MoS2 structure, and the other is dominated by triangular flakes with monolayer or bilayer structures. Our results demonstrate that two types of flakes can be tuned by changing the growth temperature and carrier-gas flux, which originates from their different nucleation mechanisms that essentially depends on the concentration of MoO3-x and S vapor precursors: a lower reactant concentration facilitates the 2D planar nucleation leads to the monolayer/bilayer MoS2 and a higher reactant concentration induces the self-seeding nucleation which easily produces few-layer and multilayer MoS2. The reactant-concentration dependence of nucleation can be used to control the growth of MoS2 and understand the growth mechanism of other TMDs.
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