Journal
SOLAR ENERGY
Volume 68, Issue 4, Pages 357-360Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0038-092X(00)00022-0
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Promising solutions for low-cost antireflective (AR) covers for solar receivers are based on the principle of mixing bulk material with air on a subwavelength scale in order to obtain very low effective refractive indices. Possibilities to achieve this are given by porous media and by periodic or stochastic subwavelength surface-relief structures. In this work, the mentioned approaches were investigated experimentally. Subwavelength surface-relief structures were embossed in organically modified sol-ger materials or in acrylic materials, and porous sol-gel coatings were produced by dip-coating. It is shown that the solar transmittance of a transparent cover can be improved by up to 6% with a porous sol-gel coating at normal incidence. This improvement of the solar transmittance increases with larger angles of incidence. (C) 2000 Elsevier Science Ltd. All rights reserved.
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