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Prolonging exciton lifetime of WSe2 monolayer through image dipole interaction leading to huge enhancement of photocurrent

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Title
Prolonging exciton lifetime of WSe2 monolayer through image dipole interaction leading to huge enhancement of photocurrent
Author(s)
Kwang Jin Lee; So, Jae-Pil; Chamoli, Sandeep Kumar; Lee, Hoo-Cheol; Hong-Gyu Park; Minhaeng Cho
Publication Date
2023-02
Journal
NANOPHOTONICS, v.12, no.4
Publisher
WALTER DE GRUYTER GMBH
Abstract
Two-dimensional transition metal dichalcogenides (2D TMDs) have been demonstrated as one of the most outstanding materials not only for fundamental science but also for a wide range of photonic applications. However, an efficient way to control their excitonic properties is still needed for advanced applications with superior device performance. Here, we show that the exciton lifetime of WSe2 monolayer can be prolonged using metamaterials. We observe a similar to 100% reduction in the electron-hole recombination rate of WSe2 monolayer placed on a hyperbolic metamaterial substrate and demonstrate that such a remarkable change results from the destructive image dipole interaction with the in-plane exciton transition dipole. Furthermore, this substantial increase in exciton lifetime leads to order-of-magnitude (10-fold) enhancement of photocurrent in the 2D WSe2-based hybrid photodetector with metamaterials. Tailoring the optical transition properties of 2D TMD materials with specially designed metamaterials, demonstrated here, will pave the way for developing 2D material-based optoelectronics.
URI
https://pr.ibs.re.kr/handle/8788114/13965
DOI
10.1515/nanoph-2022-0590
ISSN
2192-8606
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > 1. Journal Papers (저널논문)
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