疏水耐环境型SiO2/TiO2/SiO2-TiO2太阳能宽光谱增透膜的制备及性能研究

利用TFCcal设计软件构建膜系结构, 采用溶胶-凝胶工艺和提拉法在超白玻璃上制备出厚度精确可控的宽光谱、高增透型SiO₂/TiO₂/SiO₂-TiO₂减反膜, 同时结合甲基三乙氧基硅烷(MTES)改性碱催化的SiO₂溶胶, 通过提拉法一次制备出高透过率疏水型薄膜。研究表明, 高增透型三层宽光谱减反膜的理论膜层厚度依次为: 80.9 nm(内层SiO₂-TiO₂)、125.0 nm(中间层TiO₂)、95.5 nm(外层SiO₂), 其在400~700 nm可见光范围内平均透过率实际可高达97.03%以上。多层膜经过退火处理后, 膜面的水接触角高达131.5°, 同时陈化两个月以后的多层膜透过率仅下降0.143%, 表明制备的SiO₂/TiO₂/ SiO₂-TiO₂多层减反膜具有优良的疏水和耐环境性能。

Hydrophobic and Environment-resistant Properties of SiO2/TiO2/SiO2-TiO2 Multilayer Antireflective Films in Wide Solar Spectra Range

In the help of coatings optimization design using TFCcal program, wide spectrum antireflective SiO₂/ TiO₂/SiO₂-TiO₂ multilayer films with thickness precisely controlled were prepared on low iron glass using sol gel process and Czochralski method. The thickness of above layers were separately set as 80.9 nm (SiO₂-TiO₂, inner layer), 125.0 nm (TiO₂, inter-layer) and 95.5 nm (SiO₂, outer layer) according to the results of calculation. A high transmission and highly hydrophobic film was prepared by Czochralski method combined with methyl triethoxysilane (MTES) SiO₂ modified base-catalyzed sol. The average optical transmittance could reach 97.03% in the wavelength range of 400-700 nm. After annealing treatment, the surface water contact angles were almost around 131.5°. Furthermore, the optical transmittance only reduced 0.143% after aging for two months, showing that the prepared SiO₂/TiO₂/SiO₂-TiO₂ multilayer antireflective films had excellent hydrophobic and environment resistant properties.