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. 2019 Oct 13;2019:6494565. doi: 10.34133/2019/6494565

Figure 3.

Figure 3

Symmetry and structural characterizations. (a) Top view of the stick-and-ball lattice structure of trilayer 3R WS2. The blue and yellow spheres represent W and S atoms, respectively. (b) Atomic resolution ADF-STEM image of 3R-stacked trilayer WS2. (c, d) Layer-dependent (c) and power-dependent (d) SHG spectra of WS2 with 3R stacking under excitation of λex = 820 nm. The insets in (c) and (d) show the parabolic increase of the SHG intensity with increasing the number of layer and power density, respectively.