Large area, low cost anti-reflective coating for solar glasses
Large area, low cost anti-reflective coating for solar glasses
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DOI：
10.1016/j.solmat.2014.05.034
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发表时间：
2014-09-01
影响因子：
6.9
通讯作者：
Wondraczek, Lothar
中科院分区：
文献类型：
--
作者：
Nielsen, Karsten H.;Orzol, Dominik K.;Wondraczek, Lothar
我们提出从湿沉积的硅酸钾水溶液在线形成溶胶，作为在用于太阳能转换的玻璃上生成高性能大面积抗反射（AR）表面的新途径。与替代技术相比，本方法能够以非常低的成本进行处理。评估了涂层形成和固结的机制。沉积后，硅酸钾水溶液干燥成相互连接的 SiO2 胶体和分散的氢氧化钾和碳酸盐的凝胶。在此阶段已经建立了类似于 20-40 nm 的典型胶体尺寸，而在后续过程中没有显着增长。钾物质在随后的清洗过程中被去除，仅在纳米多孔二氧化硅层中的涂层和基材之间的界面处留下少量残留钾。在最后的退火步骤中，物理和化学结合的水物质被从涂层中去除。通过这种方式，可以轻松创建厚度约为 100-150 nm 的纳米多孔二氧化硅 AR 层。 AR效应是由该层的两束干涉引起的，使得c-Si太阳能玻璃和薄膜模块的单面镀膜在550 nm波长下的绝对透射率增加3.6%，在400-1100 nm光谱范围内相对透射率增加3.1%。 (C) 2014 Elsevier B.V. 保留所有权利。
We present on line formation of a sol from wet-deposited aqueous potassium silicate solutions as a novel route for the generation of highly performing large-area anti-reflective (AR) surfaces on glasses for solar energy conversion. Compared to alternative technologies, the present approach enables processing at very low cost. The mechanism of coating formation and consolidation was evaluated. Following deposition, the aqueous potassium silicate solution dries into a gel of interconnected SiO2 colloids and dispersed potassium hydroxides and carbonates. A typical size of similar to 20-40 nm of the colloids is established already at this stage without significant growth in the later process. Potassium species are removed in a subsequent washing procedure, leaving only a minor amount of residual potassium at the interface between coating and substrate in an otherwise nanoporous silica layer. Physically and chemically bound water species are driven-out of the coating in a final annealing step. In this way, an AR layer of nanoporous silica with a thickness of similar to 100-150 nm is easily created. The AR effect is caused by two-beam interference at this layer, enabling an absolute transmission increase of 3.6% at a wavelength of 550 nm and a relative transmission increase of 3.1% over the spectral range of 400-1100 nm for a single-side coating on solar glass for c-Si as well as thin-film modules. (C) 2014 Elsevier B.V. All rights reserved.