Simulation Research on Broadband and High‐Efficiency Solar Absorber Based on Spiral Metasurface

This article describles a new type of highly efficient solar absorber. The average absorption coefficient of this model under the condition of 1000 K temperature and within the spectral range of 280–3000 nm, which is as high as 97.9%, is obtained. Under the AM1.5 condition, the weighted average absorption rate of this model is as high as 97.8%. By analyzing the electric and magnetic field conditions of several absorption peaks, the high‐efficiency absorption of this model is not only limited to the materials it uses, but also related to the resonance caused by its geometric structure. This absorber has excellent thermal stability. It is found that this model has excellent thermal conversion efficiency performance and shows a continuous increase trend as the temperature rises. Using the control variable method to analyze, the adjustments of structural parameters of this model are obtained. Finally, the angle of the incident light is analyzed. The results show that the absorption rate of this model remains very high at different angles. Therefore, it is concluded that this model is angle insensitive. From the above analysis, it can be concluded that this model has an absolutely promising future application.