Highly Absorbing Coatings Using Graded Refractive Indices And Textured Surfaces

H. G. Craighead

doi:10.1117/12.935538

28 November 1983 Highly Absorbing Coatings Using Graded Refractive Indices And Textured Surfaces

H. G. Craighead

Proceedings Volume 0401, Thin Film Technologies I; (1983) https://doi.org/10.1117/12.935538
Event: 1983 International Technical Conference/Europe, 1983, Geneva, Switzerland

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.

Citation Download Citation

H. G. Craighead "Highly Absorbing Coatings Using Graded Refractive Indices And Textured Surfaces", Proc. SPIE 0401, Thin Film Technologies I, (28 November 1983); https://doi.org/10.1117/12.935538

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