Multilayered gold, MgF2 and tungsten based ultra wide band infrared absorber for solar cell applications

In this study, we propose a multilayered gold-, MgF2-, and tungsten-based ultra wideband solar absorber for the infrared frequency spectrum. This absorber's structure was numerically investigated for the two-unit-cell structure to identify similarities and differences in absorption values. The structure of the solar cell was studied over 100-1200 THz of the frequency spectrum. The proposed structure was analyzed, and the numerical results were derived in terms of absorption, transmittance, and reflectance. The effects of different physical parameters, such as height, and oblique angle incidence were also explored to identify the appropriate absorption spectra. The proposed structure provided more than 60% of the average absorption for the entire solar spectrum band. Furthermore, this structure was also compared with the standard AM 1.5 solar absorption spectrum to identify the absorption behavior in the solar spectrum. The proposed results and comparative analysis can be used for designing wideband and short band solar cells and infrared absorbers.