Tunability of the Energy Transfer Process in Type-II Heterostructures

The modulation of energy transfer processes in transition metal dichalcogenide heterostructures signifies a promising avenue for the precise control of energy distribution and flow at the nanoscale. Typically, in type-II heterostructures, energy transfer is overshadowed by ultrafast charge processes. However, in this study, the manipulation of an energy transfer process in the MoS₂/WS₂ heterostructure has been accomplished through the introduction of a resonant state. By employing optical techniques with energy, temporal, and spatial resolutions, we discern both charge and additional energy transfer processes. The energy transfer is ascribed to the resonant energy alignment between the WS₂ A exciton and the newfound resonant state of MoS₂. Through the modulation of the energy of the resonant state, this study introduces a novel approach to fine-tune the energy transfer process. This endeavor not only sheds light on the fundamental mechanisms of charge and energy transfer at interfaces but also provides a straightforward yet robust method to regulate energy flow in type-II heterostructures. The findings bear significant implications for advancing the comprehension of these processes and offer practical insights for the development of electronic devices with tailored functionalities.