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Proceedings Paper

Characterization of a-C:H/W and a-C:H/Cr solar selective absorber coatings
Author(s): R. Gampp; P. Gantenbein; Y. Kuster; Paul P. Reimann; R. Steiner; P. Oelhafen; Stefan Brunold; Ulrich Frei; Andreas Gombert; Ralph Joerger; Wolfgang Graf; Michael Koehl
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Paper Abstract

Tungsten and chromium containing hydrogenated amorphous carbon films were deposited in a process which combines plasma activated chemical vapor deposition of methane and r.f.- sputtering of a metallic target. The metal content of the deposits can be adjusted by the ratio of gas flow between argon and methane and was determined by X-ray Photoelectron Spectroscopy (XPS). For the a-C:H/W composites the XPS data are presented in detail and supply information about the chemical state of carbon and tungsten. The presence of W in carbidic state could be proven. Furthermore the optical constants n and k of a-C:H/W were obtained in the wavelength range between 0.4 and 2.6micrometers and for W concentrations of up to 33 at.%. The morphology of the deposits, determined by atomic force microscopy, ranges from very porous to compact and can be controlled by the substrate bias voltage. Accelerated ageing investigations were performed in air in order to characterize the deterioration mechanisms of a-C:H/W and a-C:H/Cr films deposited on different substrate materials. The significance of the morphology of the coating and the roughness of the substrate for the ageing mechanisms could be shown. Very promising results concerning the film stability were obtained for a-C:H/Cr.

Paper Details

Date Published: 9 September 1994
PDF: 15 pages
Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185360
Show Author Affiliations
R. Gampp, Univ. Basel (Switzerland)
P. Gantenbein, Univ. Basel (Switzerland)
Y. Kuster, Univ. Basel (Switzerland)
Paul P. Reimann, Univ. Basel (Switzerland)
R. Steiner, Univ. Basel (Switzerland)
P. Oelhafen, Univ. Basel (Switzerland)
Stefan Brunold, Solarenergie Pruef- und Forschungsstelle, Ingenieurschule ITR (Switzerland)
Ulrich Frei, Solarenergie Pruef- und Forschungsstelle, Ingenieurschule ITR (Switzerland)
Andreas Gombert, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Ralph Joerger, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Wolfgang Graf, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Michael Koehl, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)

Published in SPIE Proceedings Vol. 2255:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII
Volker Wittwer; Claes G. Granqvist; Carl M. Lampert, Editor(s)

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