Volume 128, Number 3, November 2019
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 January 2020|
Study on the broad spectral absorption property of monolayer MoS2 based on hybrid structures
School of Energy and Power Engineering, Nanjing University of Science and Technology Nanjing 210094, China and MIIT Key Laboratory of Thermal Control of Electronic Equipment, Nanjing University of Science and Technology Nanjing 210094, China
Received: 5 July 2019
Accepted: 5 November 2019
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.
PACS: 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures / 42.25.Bs – Wave propagation, transmission and absorption
© EPLA, 2020
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