Monolayer transition metal dichalcogenides tunable broadband absorber based on ring-disc structure

Abstract

In this paper, a solar absorber is designed which combines monolayer molybdenum disulfide and titanium resonator. The finite difference time domain (FDTD) method is used for theoretical simulation in this paper. By discussing the geometrical parameters, surface structure shape and incident light parameters of the surface resonator, an ideal scheme is obtained. It can be found that this structure shows excellent absorption performance. The average absorption efficiency of the optimized absorber is close to 90% within 300–2000 nm. The two peaks values appear at 709 nm and 1144 nm respectively, and the maximum values are 98% and 99%, respectively. This structure is polarization-insensitive and can work at a wide range of incident angles. Beyond that, other transition metal dichalcogenides (TMDCs) have been simulated and shown to have similar photoelectric properties. The above excellent properties show that this new absorber has a broad application in efficient light absorption.