Investigation of double-patterned TiN architecture for Ultra-Wideband Solar Absorption and Thermal Emission

Abstract

In this study, we designed a broadband solar absorber based on dual-layer stacked nanostructures of TiN. Our entire research is based on the analysis results of the FDTD method. We set the wavelength in the range of 250 - 3500 nm for simulation. Through the simulation results, we can get the band. The absorption rate in the wavelength range of 250 - 3110 nm is greater than 90%, and the corresponding bandwidth is 2860 nm. The average absorption rate of this structure is 96.42%; in the case of AM1.5, the absorption efficiency is 95.7%, and the energy loss is 4.3%. We can see that this structure has the ability to absorb the solar spectrum very efficiently. We then show through electromagnetic field distribution analysis that this structure has surface plasmon resonance, FP resonance, and multi-mode coupling. Angle sensitivity analysis shows that the absorption efficiency is greater than 90% in the incident angle range from 0° to 60°, proving polarization independence. At the same time, we also performed relevant calculations and analyzes on the thermal radiation efficiency of the absorber. The thermal radiation performance of the structure shows that the structure has good characteristics, making it suitable for working in high temperature environments.