Optimization of TiAlN/TiAlON/Si^sub 3^N^sub 4^ solar absorber coatings

A procedure to optimize a solar absorber coating stack with layers of TiAlN, TiAlON, and Si...N..., prepared using direct current magnetron sputtering on stainless steel with a Mo buffer layer, is presented. As input for this procedure the optical constants of individual layers of TiAlN, TiAlON, and...

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Bibliographic Details
Published in:Solar energy 2015-08, Vol.118, p.410
Main Authors: An, Liqiong, Ali, Syed Talat, Søndergaard, Thomas, Nørgaard, Jeppe, Tsao, Yao-Chung, Pedersen, Kjeld
Format: Article
Language:English
Subjects:
Design optimization
Geometry
Simulation
Spectrum analysis
Stainless steel
Substrates
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Summary:A procedure to optimize a solar absorber coating stack with layers of TiAlN, TiAlON, and Si...N..., prepared using direct current magnetron sputtering on stainless steel with a Mo buffer layer, is presented. As input for this procedure the optical constants of individual layers of TiAlN, TiAlON, and Si...N..., deposited on Si substrates were obtained using spectroscopic ellipsometry and reflectance spectra for each material were calculated by the transfer matrix method using the obtained optical constants, showing good agreement with measured spectra. The optical constants were then used to design an optimized three-layer absorber coating by numerical simulations. Focused-Ion-Beam cross-sectioning showed that the individual layers of an actual fabricated three-layer absorber had a total thickness of 255 nm (92 nm of TiAlN, 78 nm of TiAlON, and 85 nm of Si...N..., for individual layers) with a 100-nm-thick Mo buffer layer. For this experimental geometry we found a solar absorptance and thermal emittance of 94.6% and 5.2% at 400 K by analyzing the experimental reflectance spectrum of the whole stack. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0038-092X
1471-1257