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Proceedings Paper

Aging of solar selective Cr-SiO absorbers
Author(s): M. Djahanbakhsh; J. Eldring; Boris Kluge; Ludwig K. Thomas
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Paper Abstract

Thin films of CR-SiO-cermets produced by evaporation on metal substrates show spectral selectivity. This property depends not only on the substrate material,m the average composition and the thickness of the film but also on the conditions of the preparation. In particular the temperature of the substrate during preparation has a strong influence on the change of selectivity during ageing. Ageing processes have been investigated in the temperature range 400 to 800 degree(s)C in Ar-atmosphere for time periods up to 42 days by means of optical measurements, X-ray analysis and other properties. The main effect is the decrease of the thickness of the film and a change of the structure. By dissociation of the SiO into Si and SiO2 all chromium-silicides have been observed which are known from the binary Cr-Si-constitution diagram with the exception of CrSi. Some formation of Cr2O3 was observed not because of the development of oxygen by the reduction of SiO2 but by residual oxygen in the Ar-atmosphere.

Paper Details

Date Published: 9 September 1994
PDF: 10 pages
Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185363
Show Author Affiliations
M. Djahanbakhsh, Technische Univ. Berlin (Germany)
J. Eldring, Technische Univ. Berlin (Germany)
Boris Kluge, Technische Univ. Berlin (Germany)
Ludwig K. Thomas, Technische Univ. Berlin (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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