用于太阳集热器的sol-gel宽带SiO_2减反膜  

SOL-GEL DERIVED WIDE-BAND ANTIREFLECTIVE SiO_2 COATING USED FOR SOLAR HEAT COLLECTOR

作　　者：杨天河[1] 吴广明[1] 赖珍荃[1] 张拥华[1] 张会林[1] 沈军[1] 王珏[1] 范滨[2] 周东平[2] 

机构地区：[1]同济大学波耳固体物理研究所,上海200092 [2]中国科学院上海技术物理研究所,上海200083

出　　处：《太阳能学报》2000年第3期253-257,共5页Acta Energiae Solaris Sinica

摘　　要：为了提高太阳集热器的集热效率 ,必须抑制透明盖板表面的反射 ,纳米多孔 Si O2 薄膜可以达到宽带减反射效果。理论分析获得了优化的纳米多孔复合 Si O2 宽带减反膜的光学参数 ,实验上通过 TEOS水解与缩聚反应 ,控制不同的催化剂、反应剂配比等条件 ,成功获得了不同颗粒的 Si O2溶胶 ,制得具有折射率可调的 sol- gel薄膜以及台阶折射率变化的双层纳米复合 Si O2 薄膜。薄膜的光学参数采用椭偏仪和台阶仪进行测量 ,薄膜形貌特征及结构通过 SEM观测 ,基底和薄膜的反射率则用分光光度计测量。在 30 0— 2 5 0 0 nm波段内玻璃表面的平均反射率 ,从未镀膜的 0 .0 6 9降低到镀膜后的 0 .0 12 ,实验结果与理论计算基本吻合。To improve efficiency of the solar heat collector,a wide band antireflective (AR) coating composed of nanostructure porous SiO 2 particles was designed and coated on the transparent glazing of a solar collector to reduce its reflectivity.In this paper,the optimal optical parameters of the coating was determined by theoretical calculation of the reflectivity by using optical principle of this films.Using different catalysts and controlling the molar ratio of reactors and other experimental parameters,SiO 2 sols with different particles were prepared by hydrolysis and condensation reaction of TEOS diluted in ethanol.SiO 2 coatings derived from such sols were prepared with the desired optical parameters of AR coating.The optical parameters of the coating is measured by ellipsometer and alpha step apparatus,the microstructure by SEM and the reflectivity by spectrophotometer.Over the range of 300～2500nm wavelength,the mean reflectivity of the glass substrate was 0.069,while that of glass with bilayer nanostructured SiO 2 coating is reduced to 0.012.

关 键 词：SOL-GEL 减反膜 宽带 太阳能集热器 

分 类 号：TK512[动力工程及工程热物理—热能工程]