A5090825798- 2D Materials and Applications
- Graphene research and applications
- Perovskite Materials and Applications
- Advanced Thermoelectric Materials and Devices
- MXene and MAX Phase Materials
- Quantum Dots Synthesis And Properties
University at Buffalo, State University of New York
2021-2022
Realizing van der Waals (vdW) epitaxy in the 1980s represents a breakthrough that circumvents stringent lattice matching and processing compatibility requirements conventional covalent heteroepitaxy. However, due to weak vdW interactions, there is little control over film qualities by substrate. Typically, discrete domains with spread of misorientation angles are formed, limiting applicability epitaxy. Here, epitaxial growth monocrystalline, Cr5 Te8 2D crystals on monolayer WSe2 chemical...
Understanding the growth mechanisms of two-dimensional (2D) van der Waals (vdW) heterostructures is great importance in exploring their functionalities and device applications. A custom-built system integrating physical vapor deposition optical microscopy/Raman spectroscopy was employed to study dynamic processes 2D vdW situ. This allows us identify a new mode with distinctly different rate morphology from those conventional linear mode. We propose model that explains difference morphologies...
In this work, a chemical vapor deposition (CVD) method was developed for the synthesis of transition metal dichalcogenide alloy monolayers, with composition gradient in radial direction. The achieved by controlling substrate cooling rate during CVD growth. two types alloys, namely, WS2(1-x)Se2x and MoS2(1-x)Se2x, were found to exhibit an opposite gradient. This is attributed their different cohesive energies. A two-dimensional Ising model used explain growth mechanism, where ends modeled as...