Interlayer Coupling and Exciton Dynamics in 2D Hybrid Structures based on an InGaN Quantum Well coupled to a MoSe2 Monolayer
Hybrid structures incorpora1ng both III-nitride and Transi1on Metal Dichalcogenide (TMD) semiconductors have strong applica1on poten1al for light harves1ng and optoelectronics. Here we have inves1gated the proper1es of hybrid structures based on a MoSe2 monolayer coupled to an InGaN quantum well (QW). The coupling efficiency is controlled by a thin GaN barrier of variable thickness located between them. Time-integrated and 1me-resolved micro-photoluminescence experiments show a quenching of the InGaN QW exciton emission which increases with the decrease of the GaN barrier thickness d: the PL intensity is reduced by a factor 3 for d=1 nm as a consequence of carrier transfer to the MoSe2 monolayer. This interplay between the two semiconductors is confirmed by 1meresolved photoluminescence spectroscopy highligh1ng a clear reduc1on of the QW exciton life1me in the presence of the monolayer. Interes1ngly the coupling between the QW and the TMD monolayer is also demonstrated by measuring op1cally the excitonic transport proper1es in the quantum well: the exciton diffusion length decreases in the presence of the MoSe2 monolayer. The measured dependences as a func1on of temperature highlight the role played by localiza1on effects in the QW. All these results can be well interpreted by a type II band alignment between the InGaN QW and the MoSe2 monolayer and a tunneling process between the two semiconductors.