Broadband absorption enhancement with ultrathin MoS_2 film in the visible regime |
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Authors: | Jun Wu |
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Affiliation: | (College of Electrical Engineering,Anhui Polytechnic University,Wuhu 241000,China;Department of Physics,Zhejiang University of Science and Technology,Hangzhou 310023,China) |
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Abstract: | The broadband absorption enhancement effect in ultrathin molybdenum disulfide(Mo S2) films is investigated. It is achieved by inserting the Mo S2 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. |
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