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Proceedings Paper

Chemical composition of TiNxOy solar selective absorbers
Author(s): J. Eitle; P. Oelhafen; Michel P. Lazarov; R. Sizmann
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Paper Abstract

TiNxOy films were prepared by activated reactive evaporation (ARE) on copper to produce a tandem solar absorber exhibiting a low emissivity (epsilon) (250 degree(s)C) 2/PO2) gas pressure ratios, show that maximum (epsilon) is obtained when the ratio PN2/PO2 is held approximately equals eight. The chemical composition of these TiNxOy films was determined by x-ray photoelectron spectroscopy (XPS) and related to solar selective properties. The investigated samples consist of about 38 - 42 atomic % titanium, 35 - 37 at% oxygen and 21 - 23 at% nitrogen (bulk values), depending on preparation conditions. A depth profile indicates an oxygen enrichment at the surface, partially due to the exposure of the samples to atmosphere. After sputtering the photoelectron spectra show a marked peak at the TiO and TiN positions and a weaker one at the TiO2 position. Therefore, with regard to the known composition, the film is mainly a TiO(-N) compound with a small admixture of TiO2. The surface layer is almost entirely consisting of TiO2. Additionally, there might also be a small amount of TiC (3 at% carbon impurity was detected).

Paper Details

Date Published: 25 November 1992
PDF: 9 pages
Proc. SPIE 1727, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows, (25 November 1992); doi: 10.1117/12.130486
Show Author Affiliations
J. Eitle, Univ. Basel (Switzerland)
P. Oelhafen, Univ. Basel (Switzerland)
Michel P. Lazarov, Ludwig-Maximilians-Univ. Muenchen (Germany)
R. Sizmann, Ludwig-Maximilians-Univ. Muenchen (Germany)


Published in SPIE Proceedings Vol. 1727:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows

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