9 September 1994 Characterization of a-C:H/W and a-C:H/Cr solar selective absorber coatings
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Proceedings Volume 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII; (1994) https://doi.org/10.1117/12.185360
Event: Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, 1994, Freiburg, Germany
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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. Gampp, R. Gampp, P. Gantenbein, P. Gantenbein, Y. Kuster, Y. Kuster, Paul P. Reimann, Paul P. Reimann, R. Steiner, R. Steiner, P. Oelhafen, P. Oelhafen, Stefan Brunold, Stefan Brunold, Ulrich Frei, Ulrich Frei, Andreas Gombert, Andreas Gombert, Ralph Joerger, Ralph Joerger, Wolfgang Graf, Wolfgang Graf, Michael Koehl, Michael Koehl, } "Characterization of a-C:H/W and a-C:H/Cr solar selective absorber coatings", Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185360; https://doi.org/10.1117/12.185360
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