fig4

Figure 4. Planar lattice mismatch-induced strain for 2D materials. (A) Schematic illustrating the growth process of monolayer WSe₂-MoS₂ heterostructures; (B) PL spectra and its spatial mapping of MoS₂ at different locations; (A-B): quoted with permission from Li et al.^[76]; (C) Schematic of 2D superlattices growth process composed of different TMDs; (D) False-color SEM images of a superlattice with different thickness configurations from I to V, Scale bars, 200 nm; (E) The plot of WS₂/WSe₂ superlattices with thickness configurations from I to V; (F) Normalized PL spectra of intrinsic WS₂ and WS₂ in the superlattices I to V; (C-F): quoted with permission from Xie et al.^[77]. PL: Photoluminescence; TMDs: transition metal dichalcogenides; 2D: two-dimensional.