Quantum Confinement-Tunable Ultrafast Charge Transfer in a PbS Quantum Dots/WSe2 0D–2D Hybrid Structure: Transition from the Weak to Strong Coupling Regime

0D–2D mixed-dimensional hybrid structures, which combine tunable optical properties of 0D quantum dots (QDs) and high transport mobilities of 2D layered materials, have shown great potential in optoelectronic applications. Understanding charge transfer dynamics at the 0D–2D interface is essential but still lacking. Here, using PbS QD/WSe2 system, by simply controlling PbS QD size, we show a tunable hole transfer (HT) rate by more than 4 orders of magnitude (from ∼1 ns to