具有宽带高吸收特性的吸收器是太阳能利用的关键。设计了一种含有抗反射层的基于二维光子晶体结构的太阳能吸收器,其中砷化镓(GaAs)作为吸收介质,被填充到具有四方晶格结构的二维光子晶体的钨(W)基底圆形空腔中。采用有限元法进行了模拟计算分析,结果表明,在300~2500 nm的波长范围内,吸收器的平均吸收率为92.5%,有效吸收率高达94.9%,入射仰角为50°时,有效吸收率仍有90.13%。该结构具有全太阳光谱高吸收、偏振不敏感和广角吸收等特点。研究结果为高性能太阳能吸收器的设计提供了参考。

The absorber with broadband and high absorption is the key for the utilization of solar energy. We designed a solar absorber based on a two-dimensional photonic crystal structure including an antireflective layer, in which Gallium arsenide (GaAs) is used as the absorbing medium and filled in the tungsten (W)-based circular empty cavity of two-dimensional photonic crystal with tetragonal lattice. The finite element method is used for the simulation and calculation, and the results show that in the wavelength range of 300--2500 nm, the average absorptivity of the absorber is 92.5% and the effective absorptivity is up to 94.9%. Moreover, the effective absorptivity of the absorber is 90.13% when the incident angle is 50°. The proposed structure has the characteristics of high absorption in the full solar spectrum, polarization-insensitivity and wide-angle absorption. These research results can provide a certain reference for the high-performance solar absorber.