Growth and Optoelectronic Properties of Large-Scale Bilayer WS2 Ribbons with Unusual Shapes via Chemical Vapor Deposition

Atomically thin transition metal dichalcogenides (TMDCs) have attracted worldwide interest for their prospective potential in electronic and optoelectronic fields. However, TMDCs tend to grow into two-dimensional (2D) flakes rather than one-dimensional (1D) micro/nanoribbons due to their intrinsic layered structure. Here, large-scale bilayer WS2 ribbons with unusual shapes have been achieved through the space-confined chemical vapor deposition method via utilizing WO3 and S powders as the precursors. The microstructures and optical and electronic properties of as-grown bilayer WS2 ribbons have been systematically researched. Moreover, the possible growth mechanism of such special structures is revealed by the growth-time-dependent morphological evolution of the WS2 crystals. Our results emphasize the prospects for the successful fabrication of novel 1D TMDC structures for high-performance optoelectronic devices at nanoscale, including transistors, photocatalysts, photovoltaic cells, and spintronic devices.