Abstract

In order to obtain broadband, highly efficient, wide-angle, and polarization-insensitive solar absorbers, we propose a universal configuration consisting of monolayer molybdenum disulfide (${{\rm MoS}_2}$) and the metal-insulator-metal structure, which gives rise to significant absorption enhancement of the ${{\rm MoS}_2}$ layer. Light trapping structures with silver square-, circle-, and crossed-shaped resonators are investigated. The localized surface plasmon resonances among the silver resonators induce prominent interaction between the incident photon and ${{\rm MoS}_2}$ layer, contributing to efficient absorption of light energy. Simulation results show that the absorber made of square patches enables the best performance and realizes absorptance higher than 90% from 400 to 666 nm and an average absorptance greater than 91% in the range of 400–700 nm. The average light absorption within the ${{\rm MoS}_2}$ layer reaches 74% in the visible spectrum, which is one of the highest levels for the existing ${{\rm MoS}_2}$-based absorbers. Meanwhile, the polarization-independent designs exhibit good angle tolerance within 50° incidences. Such a universal structure can also obtain broadband and highly efficient absorption by using other transition metal dichalcogenides such as ${{\rm MoSe}_2}$, ${{\rm WS}_2}$, and ${{\rm WSe}_2}$, which indicates that the configuration has great applicability in solar energy absorption of 2D materials. The proposed solar absorbers with simple configuration and broadband absorption in wide incident angles have potential in applications such as solar cells, photovoltaic devices, and blackbody materials.

© 2020 Optical Society of America

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