2D Material Based Hybrid Nanoscroll for Enhanced Polarized Photodetection and Lasing*

The free-standing of 2D materials by buckling^[1] or twisting^[2] them, enhance their carrier mobility and stimulates multiple photonic modes which are significantly absent in planar 2D sheets. The flexural strength of 2D material has been exploited to fabricate an encapsulated spirally rolled quasi unidirectional nanoscroll (NS) structure. This self-encapsulating structure can confine the motion of the electron in the 1D axis without having any external perturbation. Upon hybridizing with high yield QDs the physiochemical properties of the NS can get immensely manipulated. The photo-generated excitons after getting dissociated at the QD/2D interfaces enhance the photosensitivity almost 3000 fold compared to the pristine scroll. The subsequent presence of QDs as a scatterer at the inner wall of the NS stimulates lasing action. The multiple internal reflections inside this nanocavity generate coherent lasing action with an unprecedently low threshold. This helical structure predominately localizes the excitons along the circumference of the scroll instigating 12-fold brighter parallel polarized emission compared to the perpendicular one.

References:
[1] Ghosh, R., et al. DOI:10.1021/acsami.9b08294

[2] Ghosh, R., et al.DOI:10.1002/smll.202003944