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Proceedings Paper

Highly Absorbing Coatings Using Graded Refractive Indices And Textured Surfaces
Author(s): H. G. Craighead
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Paper Abstract

Films with spatially graded refractive indices can be formed by a variety of techniques to produce high efficiency coatings. Cermet films with graded compositions are useful as selective surfaces and their absorptivity can be enhanced by coating with a microscopically textured surface to provide solar absorptivities approaching 0.99. High temperature stable Mo-Al20 and Pt-Al203 have been formed with this enhancement. Microscopically textured but chemically homogeneous materials can also be used for simple and effective selective surfaces. Semiconductors have intrinsic selectivity in addition to that induced by the structure. The use of reactive ion etching and selective chemical etching to produce the desired microstructure of submicron sized cones or columns in semiconductor and other materials is described.

Paper Details

Date Published: 28 November 1983
PDF: 7 pages
Proc. SPIE 0401, Thin Film Technologies I, (28 November 1983); doi: 10.1117/12.935538
Show Author Affiliations
H. G. Craighead, Bell Laboratories (United States)

Published in SPIE Proceedings Vol. 0401:
Thin Film Technologies I
J. Roland Jacobsson, Editor(s)

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