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Modeling the absorption behavior of solar thermal collector coatings utilizing graded alpha-C:H/TiC layers.

Authors
  • Gruber, D P
  • Engel, G
  • Sormann, H
  • Schüler, A
  • Papousek, W
Type
Published Article
Journal
Applied Optics
Publisher
The Optical Society
Publication Date
Mar 10, 2009
Volume
48
Issue
8
Pages
1514–1519
Identifiers
PMID: 19277084
Source
Medline
License
Unknown

Abstract

Wavelength selective coatings are of common use in order to enhance the efficiency of devices heated by radiation such as solar thermal collectors. The use of suitable materials and the optimization of coating layer thicknesses are advisable ways to maximize the absorption. Further improvement is achievable by embedding particles in certain layers in order to modify material properties. We focus on optimizing the absorption behavior of a solar collector setup using copper as substrate, a layer of amorphous hydrogenated carbon with embedded titanium carbide particles (a-C:H/TiC), and an antireflection coating of amorphous silicon dioxide (aSiO(2)). For the setup utilizing homogeneous particle distribution, a relative absorption of 90.98% was found, while inhomogeneous particle embedding yielded 98.29%. These results are particularly interesting since until now, absorption of more than 95% was found only by using embedded Cr but not by using the more biocompatible Ti.

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