Towards coloured glazed thermal solar collectors
2004
Abstract Multilayers of TiO 2 and SiO 2 dielectric coatings deposited by reactive sputtering have been characterized by X-ray photoelectron spectroscopy, in situ real-time laser reflectometry, spectroscopic ellipsometry and spectrophotometry. Measurements have been performed on individual dielectric layers of TiO 2 , SiO 2 and multilayers. The experiments show a good agreement between the different techniques. Optical properties can be modelled properly using a Cauchy dispersion model. The optical constants of an individual layer are confirmed by the optical measurements on more complex multilayer structures. Reflectivity of the three-layer films fulfils the requirements for a first step towards coloured glazed thermal solar collectors.
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