Controllable Interlayer Charge and Energy Transfer in Perovskite Quantum Dots/ Transition Metal Dichalcogenide Heterostructures

Abstract Efficient interlayer charge and energy transfer are explored in CsPbBr 2 I quantum dots/MoS 2 heterostructure. When perovskite QDs directly contact MoS 2 , charge transfer from QDs to MoS 2 dominates the nonradiative exciton relaxation in QDs/MoS 2 heterostructure. With the layer number of MoS 2 reducing to a monolayer, nonradiative exciton relaxation rate increases due to reduced dielectric effect and changed energy band structure of MoS 2 . Then an hexagonal boron nitride (h‐BN) spacer is inserted between QDs and a monolayer MoS 2 , in which nonradiative exciton relaxation rate is dominated by excitonic energy transfer from QDs to MoS 2 . With the spacer thickness increasing, nonradiative exciton relaxation rate decays as 1/ d 3.03 that is slower than the result 1/ d 4 of Förster theory. This is attributed to strong near‐field dipole–dipole coupling interaction in QDs/h‐BN/MoS 2 heterostructure. Controllable interlayer charge and energy transfer potentially enable new avenues for designing optoelectronic devices, as well as for studying fundamental issue of tunable light–matter interaction at nanoscale vision.