<i>In Situ</i> Imaging of Two-Dimensional Crystal Growth Using a Heat-Resistant Optical Microscope.
basic_science · Level V
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- Record sourced from PubMed, PMID 38619556.
- Also identified by DOI 10.1021/acs.nanolett.4c00620.
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Abstract
Revealing low-dimensional material growth dynamics is critical for crystal growth engineering. However, in a practical high-temperature growth system, the crystal growth process is a black box because of the lack of heat-resistant imaging tools. Here, we develop a heat-resistant optical microscope and embed it in a chemical vapor deposition (CVD) system to investigate two-dimensional (2D) crystal growth dynamics. This <i>in</i> <i>situ</i> optical imaging CVD system can tolerate temperatures of ≤900 °C with a spatial resolution of ∼1 μm. The growth of monolayer MoS<sub>2</sub> crystals was studied as a model for 2D crystal growth. The nucleation and growth process have been imaged. Model analysis and simulation have revealed the growth rate, diffusion coefficient, and spatial distribution of the precursor. More importantly, a new vertex-kink-ledge model has been suggested for monolayer crystal growth. This work provides a new technique for <i>in</i> <i>situ</i> microscopic imaging at high temperatures and fundamental insight into 2D crystal growth.