Figure 2

(a) Side view of the atomic structure of WS2 layers. (b) Raman spectra of WS2 films on Si substrate before and after annealing. (c) AFM image of annealed WS2 film with edge area. (d) Height information along the white line marked in (c).

(a) Side view of the atomic structure of WS2 layers. (b) Raman spectra of WS2 films on Si substrate before and after annealing. (c) AFM image of annealed WS2 film with edge area. (d) Height information along the white line marked in (c).