Zhou Wei-Xi, Shen Yan, Hu Er-Tao, Zhao Yuan, Sheng Ming-Yu, Zheng Yu-Xiang, Wang Song-You, Lee Young-Pak, Wang Cai-Zhuang, Lynch David W, Chen Liang-Yao
Department of Optical science & Engineering, Fudan University, Shanghai 200433, Shanghai.
Opt Express. 2012 Dec 17;20(27):28953-62. doi: 10.1364/OE.20.028953.
Optical properties and thermal stability of the solar selective absorber based on the metal/dielectric four-layer film structure were investigated in the variable temperature region. Numerical calculations were performed to simulate the spectral properties of multilayer stacks with different metal materials and film thickness. The typical four-layer film structure using the transition metal Cr as the thin solar absorbing layer [SiO(2)(90nm)/Cr(10nm)/SiO(2)(80nm)/Al (≥100nm)] was fabricated on the Si or K9 glass substrate by using the magnetron sputtering method. The results indicate that the metal/dielectric film structure has a good spectral selective property suitable for solar thermal applications with solar absorption efficiency higher than 95% in the 400-1200nm wavelength range and a very low thermal emittance in the infrared region. The solar selective absorber with the thin Cr layer has shown a good thermal stability up to the temperature of 873K under vacuum atmosphere. The experimental results are in good agreement with the calculated spectral results.
在可变温度区域研究了基于金属/电介质四层膜结构的太阳能选择性吸收器的光学性质和热稳定性。进行了数值计算以模拟具有不同金属材料和膜厚度的多层堆叠的光谱特性。采用磁控溅射法在Si或K9玻璃基板上制备了以过渡金属Cr作为薄太阳能吸收层的典型四层膜结构[SiO₂(90nm)/Cr(10nm)/SiO₂(80nm)/Al(≥100nm)]。结果表明，金属/电介质膜结构具有良好的光谱选择性，适用于太阳能热应用，在400 - 1200nm波长范围内太阳能吸收效率高于95%，在红外区域热发射率极低。具有薄Cr层的太阳能选择性吸收器在真空气氛下高达873K的温度下表现出良好的热稳定性。实验结果与计算得到的光谱结果吻合良好。
