期刊
ACS NANO
卷 15, 期 4, 页码 6839-6848出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c10474
关键词
MoS2; chemical vapor deposition; MoS2 dendrite; morphology engineering; phase-field simulation
类别
资金
- Hong Kong Research Grants Council (RGC) under the General Research Fund (GRF) [CityU 11216119]
- Innovation and Technology Commission [ITS/166/19]
This study investigates the control of MoS2 crystal morphologies through a unified spatial-temporal model and the concept of adatom concentration profile. Experimental results demonstrate that different shapes of MoS2 crystals can be synthesized by controlling growth conditions. By comparing experimental and simulation results, the significance of adatom concentration profile and its role in the crystal growth process are highlighted.
The two-dimensional (2D) transition metal dichalcogenide (TMD) MoS2 possesses many intriguing electronic and optical properties. Potential technological applications have focused much attention on tuning MoS2 properties through control of its morphologies during growth. In this paper, we present a unified spatial-temporal model for the growth of MoS2 crystals with a full spectrum of shapes from triangles, concave triangles, three-point stars, to dendrites through the concept of the adatom concentration profile (ACP). We perform a series of chemical vapor deposition (CVD) experiments controlling adatom concentration on the substrate and growth temperature and present a method for experimentally measuring the ACP in the vicinity of growing islands. We apply a phase-field model of growth that explicitly considers similar variables (adatom concentration, adatom diffusion, and noise effects) and cross-validate the simulations and experiments through the ACP and island morphologies as a function of physically controllable variables. Our calculations reproduce the experimental observations with high fidelity. The ACP is an alternative paradigm to conceptualize the growth of crystals through time, which is expected to be instrumental in guiding the rational shape engineering of MoS2 crystals.
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