J. Phys. III France
Volume 2, Numéro 8, August 1992
Page(s) 1453 - 1459
DOI: 10.1051/jp3:1992190
J. Phys. III France 2 (1992) 1453-1459

Black tungsten selective optical coatings for photothermal solar energy conversion

K.A. Gesheva, D.S. Gogova and G. Stoyanov

Central Laboratory for Solar Energy and New Energy Sources, Bulgarian Academy of Sciences, 72 Blvrd Trakia, 1784 Sofia, Bulgaria

(Received 1st February, accepted 18 April 1992)

By pyrolytic decomposition of W(CO) 6 in the presence of an oxygen bleed black tungsten solar selective coatings have been deposited on different substrates - quartz, silicon and stainless steel. Quartz substrates were used to check the opacity of the films deposited; the silicon substrates were used to study the possibility of obtaining low-resistance material when fully annealed and the steel substrates to study the properties of the films on substrates suitable for a large scale application. The films were obtained at a temperature of 400°C and further partially annealed in a reducing atmosphere. The dependence of the structure and chemical composition on the annealing temperature was studied, as well as reflectance measurements in the visible and in the infrared region.

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