Study on the broad spectral absorption property of monolayer MoS2 based on hybrid structures

The poor light absorption property in monolayer MoS2 limits its applications such as in photonics, optoelectronics and energy utilizations. Here, we propose a hybrid structure, consisting of a Fabry-Perot (F-P) cavity, plasmonic silver (Ag) gratings and an Ag/Al2O3/Al gap-plasmon resonator, to impro...

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Bibliographic Details
Published in:Europhysics letters 2019-11, Vol.128 (3), p.37002
Main Authors: Lu, Zheng-Kai, Tan, Hong, Han, Yu-Ge
Format: Article
Language:English
Subjects:
42.25.Bs
78.67.-n
Absorption spectra
Aluminum oxide
Cavity resonators
Electromagnetic absorption
Fabry-Perot interferometers
Gratings (spectra)
Hybrid structures
Low dimensional semiconductors
Molybdenum disulfide
Monolayers
Optoelectronics
Silver
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Summary:The poor light absorption property in monolayer MoS2 limits its applications such as in photonics, optoelectronics and energy utilizations. Here, we propose a hybrid structure, consisting of a Fabry-Perot (F-P) cavity, plasmonic silver (Ag) gratings and an Ag/Al2O3/Al gap-plasmon resonator, to improve the light absorption of monolayer MoS2 in the wavelength region from 400 to 700 nm. We theoretically investigate the spectral absorption of monolayer MoS2 placed on top of different hybrid structures by FDTD simulations. The simulation results show that monolayer MoS2 in the MoS2/Ag grating/Al2O3/Al structure can absorb about 27.6% of the incident solar light integrated from 400 to 700 nm. The absorption peaks can be tuned in a wide spectral range by changing the geometrical parameters of the structure. We further design Ag gratings with interlaced stripes to enhance the absorption from 500 to 700 nm. The proposed structures in this study also can be applied to other two-dimensional semiconductors to achieve strong absorption in the visible spectral region.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/128/37002