基于圆顶锥壳阵列的超宽带太阳能吸收器研究

Research on Ultra-Wideband Solar Absorber Based on Dome-Conical-Shell Array

摘要:

提出了一种顶锥壳阵列超宽带全向超材料吸收器,研究了圆顶锥壳的几何参数、顶部的几何形状以及不同密排方式对宽带吸收的影响。研究了包覆金属薄膜的圆顶锥壳阵列在太阳辐射能谱区的超宽带吸收特性,结果显示在250~2500nm范围内的平均吸收率达到95.39%。在0°~65°的大角度入射下,对于TE和TM偏振的平均吸收率分别为92.7%和94.59%,表明所提出的结构具有偏振无关和入射角不敏感性。空气质量1.5加权平均吸收率为95.24%,证明能够有效地吸收地球上的太阳辐射。通过结合胶体球光刻技术和表面镀膜成功制备了所提出的吸收器,初步测试结果表明,其吸收性能存在提升空间。

Abstract:

An ultra-wideband omni-directional metamaterial absorber based on dome-cone-shell array was proposed. The influences of the geometric parameters of dome-cone-shell, the shape of the top and the different packing modes on the wideband absorption were studied. The ultra-wideband absorption characteristics of a metal-coated dome-cone shell array in the solar radiation spectrum are studied. The results show that the average absorption rate in the range of 250~2500nm reaches 95.39%. The average absorptivity for TE and TM polarization is 92.7% and 94.59%, respectively, at a large incidence angle from 0° to 65°, indicating that the proposed structure is polarization independent and incident angle insensitive. The weighted average absorption rate of air mass 1.5 is 95.24%, proving that it can effectively absorb solar radiation on earth. The proposed absorber was successfully prepared by combining colloidal ball lithography and surface coating. Primary test results show that the absorption performance still needs to be improved.