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Chin. Phys. B, 2021, Vol. 30(2): 024208    DOI: 10.1088/1674-1056/abc3b5
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Broadband absorption enhancement with ultrathin MoS2 film in the visible regime

Jun Wu(吴俊)1,2,
1 College of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China; 2 Department of Physics, Zhejiang University of Science and Technology, Hangzhou 310023, China
Abstract  The broadband absorption enhancement effect in ultrathin molybdenum disulfide (MoS2) films is investigated. It is achieved by inserting the MoS2 film between a dielectric film and a one-dimensional silver grating backed with a silver mirror. The broadband absorption enhancement in the visible region is achieved, which exhibits large integrated absorption and short-circuit current density for solar energy under normal incidence. The optical properties of the proposed absorber are found to be superior to those of a reference planar structure, which makes the proposed structure advantageous for practical photovoltaic application. Moreover, the integrated absorption and short-circuit current density can be maintained high for a wide range of incident angles. A qualitative understanding of such broadband absorption enhancement effect is examined by illustrating the electromagnetic field distribution at some selected wavelengths. The results pave the way for developing high-performance optoelectronic devices, such as solar cells, photodetectors, and modulators.
Keywords:  two-dimensional (2D) materials      transition-metal dichalcogenide      plasmonics      absorption enhancement  
Received:  13 August 2020      Revised:  21 September 2020      Accepted manuscript online:  22 October 2020
PACS:  42.79.Dj (Gratings)  
  78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials)  
  42.25.Bs (Wave propagation, transmission and absorption)  
  25.70.Ef (Resonances)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61405217), the Zhejiang Provincial Natural Science Foundation, China (Grant No. LY20F050001), the Anhui Polytechnic University Research Startup Foundation, China (Grant No. 2020YQQ042), and the Pre-research Project of Natural Science Foundation of Anhui Polytechnic University, China (Grant No. Xjky2020021).
Corresponding Authors:  Corresponding author. E-mail: mailswj2011@163.com   

Cite this article: 

Jun Wu(吴俊) Broadband absorption enhancement with ultrathin MoS2 film in the visible regime 2021 Chin. Phys. B 30 024208

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