Fig. 1. Structural phases and van der Waals heterostructures of WSe2(1−x) Te2x.
Side and top view of a monolayer 1H-WSe2 and b monolayer 1Td-WTe2. c Composition-dependent phase diagram determined from density functional theory calculations indicating a phase boundary at x = 0.4. d Optical image of a hexagonal boron nitride (hBN)-encapsulated x = 0.33 monolayer deposited onto a SiO2/Si substrate. The transition metal dichalcogenide (TMD) alloy is outlined in red and the monolayer (1L) portion of that flake is outlined in black. The top layer of hBN is outlined in yellow. The white scale bar is 20 μm.