School of Materials Science and Engineering, South China University of Technology , Guangzhou 510641, China.
State Key Laboratory of Luminescent Materials and Devices, and Institute of Optical Communication Materials, South China University of Technology , Guangzhou 510641, China.
ACS Appl Mater Interfaces. 2017 Sep 13;9(36):30821-30831. doi: 10.1021/acsami.7b08313. Epub 2017 Aug 28.
Vertically stacked and laterally stitched heterostructures consisting of two-dimensional (2D) transition metal dichalcogenides (TMDCs) are predicted to possess novel electronic and optical properties, which offer opportunities for the development of next-generation electronic and optoelectronic devices. In the present work, we report the temperature-dependent synthesis of 2D TMDC heterostructures on Si/SiO substrates, including MoS-WS, WS-MoS-WS, MoWS-WS, and MoWS alloyed bilayer heterostructures by ambient pressure chemical vapor deposition (CVD). Raman and photoluminescence mapping studies demonstrate that the as-produced heterostructures show distinct structural and optical modulation. Our results indicate that the evolution of various 2D heterostructures originates from the competition between the adsorption and desorption of Mo atoms and the diffusion of W atoms under various growth temperatures. This work sheds light on the design and fabrication of heterostructures using controllable interfaces and junctions of diverse TMDC atomic layers.
垂直堆叠和横向缝合的二维（2D）过渡金属二卤化物（TMDC）异质结构预计具有新颖的电子和光学性质，为开发下一代电子和光电子器件提供了机会。在本工作中，我们通过常压化学气相沉积（CVD）报告了在 Si/SiO 衬底上合成 2D TMDC 异质结构，包括 MoS-WS、WS-MoS-WS、MoWS-WS 和 MoWS 合金双层异质结构。拉曼和光致发光映射研究表明，所制备的异质结构表现出明显的结构和光学调制。我们的结果表明，各种 2D 异质结构的演变源于在不同生长温度下 Mo 原子的吸附和解吸以及 W 原子的扩散之间的竞争。这项工作为使用各种 TMDC 原子层的可控界面和连接设计和制造异质结构提供了思路。
