期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 45, 页码 42751-42759出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b14577
关键词
2D TMDCs; MoS2; chemical vapor deposition (CVD); Mo concentration gradient; diffusion-limited growth
资金
- National Natural Science Foundation of China [11974048, 11474022, 11774192, 11674031]
- National Basic Research Program of China [2014CB920903, 2013CB921701]
- State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University
- DUT [3005-82232015]
- Science and Engineering Research Council [152-70-00017]
The domain morphology in the growth of transition-metal dichalcogenides (TMDCs) is mostly triangular but rarely dendritic. Here, we report a robust chemical vapor deposition method to fabricate atomic-thin 2H-phase MoS2 dendrites on several single-crystalline substrates with different lattice structures, such as rutile-TiO2(001), SrTiO3(001), and sapphire(0001). It is found that by tuning the concentration of Mo adatoms, the morphology of MoS2 domains on these substrates evolves from tridentate dendrites at a low Mo concentration to semicompact fractal domains at an intermediate Mo concentration, and to a compact triangular shape at a high Mo concentration. First-principles calculations reveal that the edge diffusion barrier of Mo is comparable to the attachment barrier, inhibiting fast Mo atom diffusion along the edge. Kinetics Monte Carlo simulations with varying Mo concentrations well reproduce the experimental results. Our combined experimental and theoretical analyses evidently show that the growth of MoS2 dendritic domains at a low Mo concentration is a nonequilibrium process, which is dominated by the kinetics of Mo adatoms. Our study presents an effective route to control the morphology of TMDCs by simply tuning the transition-metal adatom concentration.
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