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QD/2D Hybrid Nanoscrolls: A New Class of Materials for High‐Performance Polarized Photodetection and Ultralow Threshold Laser Action
Author(s) -
Ghosh Rapti,
Lin HungI,
Chen YuSiang,
Singh Mukesh,
Yen ZhiLong,
Chiu Shengkuei,
Lin HsiaYu,
Bera Krishna P.,
Liao YuMing,
Hofmann Mario,
Hsieh YaPing,
Chen YangFang
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202003944
Subject(s) - lasing threshold , materials science , optoelectronics , nanotechnology , exciton , quantum dot , monolayer , laser , heterojunction , optics , physics , condensed matter physics , wavelength
Nanoscrolls are a class of nanostructures where atomic layers of 2D materials are stacked consecutively in a coaxial manner to form a 1D spiral topography. Self‐assembly of chemical vapor deposition grown 2D WS 2 monolayer into quasi‐1D van der Waals scroll structure instigates a plethora of unique physiochemical properties significantly different from its 2D counterparts. The physical properties of such nanoscrolls can be greatly manipulated upon hybridizing them with high‐quantum‐yield colloidal quantum dots, forming 0D/2D structures. The efficient dissociation of excitons at the heterojunctions of QD/2D hybridized nanoscrolls exhibits a 3000‐fold increased photosensitivity compared to the pristine 2D‐material‐based nanoscroll. The synergistic effects of confined geometry and efficient QD scatterers produce a nanocavity with multiple feedback loops, resulting in coherent lasing action with an unprecedentedly low lasing threshold. Predominant localization of the excitons along the circumference of this helical scroll results in a 12‐fold brighter emission for the parallel‐polarized transition compared to the perpendicular one, as confirmed by finite‐difference time‐domain simulation. The versatility of hybridized nanoscrolls and their unique properties opens up a powerful route for not‐yet‐realized devices toward practical applications.