A feasible approach to fabricate two-dimensional WS2 flakes: From monolayer to multilayer

作者：Chen, Fei^*; Ding, Su; Su, Weitao

来源：Ceramics International, 2018, 44(18): 22108-22112.

DOI：10.1016/j.ceramint.2018.08.322

• Tungsten disulfide
• Chemical vapor deposition
• Magnetron sputtering
• Optical property
• Growth mechanism

Tungsten disulfide (WS2), with indirect-direct bandgap transition when thinned down to atomically thin flake, provides intriguing applications in next-generation optoelectronics. Here, we develop a feasible approach to fabricate two-dimensional (2D) WS2 flakes by the evaporation and sulfurization of W film using S powder. The layer number and lateral dimension of the as-grown WS2 flakes are confirmed by Raman spectroscopy, photo-luminescence (PL), optical microscopy, and atomic force microscopy (AFM). The evolution of the layer number and edge length of the flakes is attributed to the concentration gradient of W vapor on the substrate surface in the atmosphere. Our result opens a novel pathway to fabricate other 2D transition metal dichalcogenides (TMDs) and construct 2D TMDs-based heterostructures.

• 出版日期2018-12-15
• 单位杭州电子科技大学