Figure 6.

(a) Correlative plot of the ω_A1g and ω_E2g values (blue circles) extracted from all the Raman spectra in the array of Figure 5. The red line represents the ideal ω_A1g vs. ω_E2g dependence (i.e., the strain line) for a purely strained 3L-MoS₂ film. The red square corresponds to the frequencies ${\mathsf{\omega }}_{{\mathrm{E}}_{2\mathrm{g}}^0}$ and ${\mathsf{\omega }}_{{\mathrm{A}}_{1\mathrm{g}}^0}$ for an ideally unstrained and undoped 3L-MoS₂, while the two red arrows with opposite directions along the strain line indicate the tensile (red-shift) and compressive strain (blue-shift), respectively. (b) Map and (c) corresponding histogram of the compressive strain on a 10 μm × 10 μm area.