Figure 1. TMDs heterostructures prepared by the PS film transfer technique.

(a,f,k) Optical microscope image of MoS₂-WS₂, MoS₂-WSe₂, and WS₂-WSe₂ heterostructures. (b,g,l) Raman mapping in the confocal measurements for the heterostructures in the dashed frame region in panels (a), (f), and (k). The yellow parts correspond to the substrates, the green, blue parts refer to the single TMDs regions, and red parts refer to heterogeneous regions. (c,h,m) Single color mapping of Raman intensity at the 385 cm⁻¹ ( mode in MoS₂) and 356 cm⁻¹ ( mode in WSe₂). (d,i,n) Pseudo-color mapping of Raman intensity at 356 cm ( mode in WS₂) and 254 cm⁻¹ ( mode in WSe₂). (e,j,o) The Raman spectra of the MoS₂-WS₂, MoS₂-WSe₂, and WS₂-WSe₂ heterostructures corresponding to the different region in panels (b), (g), and (l). Scale bars of panels (a), (f), and (k) are 20 μm, 4 μm, and 6 μm, respectively. Scale bar of panels (b-d) are 4 μm; that of panels (g–i) and (l–n) are 2 μm. The colour scale bars in the bottom of (b–d), (g–i), and (l–n) correspond to the intensity of the Raman spectra.