Efficient light-confinement in heterostructured transition metal dichalcogenide-based nanoscrolls for high-performance photonic devices

The light-matter interaction in the 2D materials can greatly be enhanced by spirally rolling them into nanoscroll (NS) structures. Hybridization of such 2D material NSs with high yield quantum dots produces type-II band alignment at the heterostructure interface. The combination of enhanced photoabsorption and occurrence of internal reflections at NS wall stimulates coherent lasing action with an unprecedently low lasing threshold and enhances the photoresponsivity by almost 3000 fold compared to its planar counterpart. Furthermore, the NS morphology imparts photosensors with an inherent ability to detect polarization. Finally, the charge transfer efficiency in NSs is enhanced by the formation of heterojunctions after intercalation of graphene. Our approach enables novel ways to develop high-performance flexible devices toward future applications. Graphical abstract