Design of ultra-high absorptivity solar absorber based on Ti and TiN multilayer ring structure

The goal of this project is to design a solar absorber that can achieve better absorption spectrum range and absorption. We adopt TiN and Si3N4 laminated ring structure, and after adding two layers of Ti-Si3N4 film, the absorption efficiency of the absorber is greater than 90% and the absorption bandwidth was great than 2450 nm. More noteworthy is that the weighted average absorption rate under AM1.5 is more than 98% (280 nm-3000 nm). On the basis of polarization independence, the solar absorber proposed by us also had strong stability to angular polarization of incident. When the incident angle reaches 60, the absorption of TE wave and TM wave remains above 90%. We also analyzed the effects of different metal materials on the solar absorber, and calculated the emission efficiency of the solar energy absorber at 375 K is 89.82%. Ultra-high absorption solar absorbers have great potential in energy utilization fields, such as converting solar light and heat into public electricity, infrared thermal imaging and information detection.