Université Grenoble Alpes, FR-38000 Grenoble, CEA LETI, Minatec Campus, Grenoble Cedex 9, France, Université de Lyon, Laboratoire C2P2, UMR 5265, CNRS, Université Claude Bernard Lyon 1 - CPE Lyon, École Supérieure de Chimie, Physique et Électronique de Lyon, 43 Boulevard du 11 Novembre 1918, Villeurbanne Cedex, France

Tungsten disulfide (WS2) monolayers are promising for next-generation flat electronics, but few scalable deposition methods are currently available. Here, the authors report the fabrication of tungsten disulfide monolayers through a novel two-step chemical vapor deposition process involving the deposition of an amorphous tungsten sulfide layer at a relatively mild temperature from the W(CO)6 and 1,2-ethanedithiol precursors, followed by a short annealing at 800 °C under an inert atmosphere. This two-step process allows the fabrication of a crystalline WS2 deposit with a low thermal budget. Raman, x-ray photoelectron, and wavelength dispersive x-ray fluorescence spectroscopic studies performed before and after annealing confirmed the deposition of a sulfur-rich amorphous intermediate, and further confirmed its conversion upon annealing toward oriented 2D WS2 crystals in the 1-2 monolayer range, as corroborated by high-resolution transmission electron microscopy. © 2017 American Vacuum Society.