Fig. 1: Interlayer Exciton formation in MoSe₂/WSe₂ HS.

a Type II band alignment diagram of the MoSe₂/WSe₂ HS. The relevant intralayer and interlayer exciton transitions are depicted with arrows. b ILX formation in the MoSe₂/WSe₂ HS. An intralayer exciton is resonantly excited in the MoSe₂ layer (1). IHT to WSe₂ causes the formation an optically bright ILX (2). c Linear absorption (black trace) and PL (green trace) spectra of the HS at 77 K. The PL spectrum was measured in a confocal Raman microscope (inVia, Renishaw) using 530 nm continuous wave excitation at 9 × 10⁷μW/cm². The four peaks in the linear absorption, marked by vertical dashed lines, correspond to A/B intralayer excitons. The PL spectrum reveals a spectral feature below the intralayer exciton absorption edge, which corresponds to ILX emission peak.