设计了一种基于耐火材料氮化钛(TiN)和二氧化钛(TiO2)的光栅型超宽带太阳能吸收器,采用有限元方法研究了其吸收特性,并分析了其结构参数、工作波长和入射角度对吸收性能的影响。结果表明:通过调整结构参数,可以有效地控制其吸收特性。当波长为500~2000 nm,入射角度为0°~75°时,吸收效率可以达到80%以上,所设计的吸收器表现出了超宽带吸收的特性。单元结构的顶层采用半球形结构,可以提高吸收器的平均吸收率。所设计的吸收器在热光伏等方面有潜在的应用前景。

A grating-type ultra-wide-band solar absorber was designed based on the refractory titanium nitride (TiN) and titanium dioxide (TiO₂). The absorption characteristics of this absorber were studied using the finite element method and the effects of its structural parameters, working wavelength and incident angle on its absorption performance were analyzed. The results show that the absorption characteristics can be effectively controlled by adjusting the structural parameters. In the wavelength range of 500-2000 nm and the incident angle range of 0°-75°, the absorption efficiency is larger than 80%, indicating that the designed absorber possesses the characteristic of ultra-broadband absorption. In addition, the top layer of the unit structure adopts a hemispherical structure, which can increase the average absorption rate of the absorber. The absorber designed in this paper has a potential application prospect in the thermo-photovoltaic and other fields.