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Many-body effect and strong Coulomb interaction in monolayer transition metaldichalcogenides lead to shrink the intrinsic bandgap, originating from therenormalization of electrical/optical bandgap, exciton binding energy, andspin-orbit splitting. This renormalization phenomenon has been commonlyobserved at low temperature and requires high photon excitation density. Here,we present the augmented bandgap renormalization in monolayer MoS_2 anchored onCsPbBr_3 perovskite quantum dots at room temperature via charge transfer. Theamount of electrons significantly transferred from perovskite gives rise to thelarge plasma screening in MoS_2. The bandgap in heterostructure is red-shiftedby 84 meV with minimal pump fluence, the highest bandgap renormalization inmonolayer MoS_2 at room temperature, which saturates with further increase ofpump fluence. We further find that the magnitude of bandgap renormalizationinversely relates to Thomas-Fermi screening length. This provides plenty ofroom to explore the bandgap renormalization within existing vast libraries oflarge bandgap van der Waals heterostructure towards practical devices such assolar cells, photodetectors and light-emitting-diodes.

Bandgap renormalization in monolayer MoS_2 on CsPbBr_3 quantum dot via charge transfer at room temperature