Fig. 2

PL inhomogeneity in strained MoSe₂–WSe₂ lateral HJs. a Optical image of a monolayer MoSe₂–WSe₂ HJ. b The PL spectra of the inner MoSe₂ and the outer WSe₂. c, d Contour color maps of the PL peak energy (c) and intensity (d) of outer WSe₂. e Five selected PL spectra from the outer WSe₂. (f) Integrated PL intensity as a function of peak energy (black dots). Solid line is the model fitting curve. The top axis is the PL peak energy shift with respect to the unstrained WSe₂. g Schematics for the band structures of monolayer WSe₂ without (black) and with (gray) tensile strain. h Schematics for the direct (K-K) and indirect (Q-K) excitonic states with energies of E _X,D and E _X,I, respectively