Macroscopic surface roughness in metal-dielectric composite films: Photothermal absorber applications
- 15 January 1982
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 40 (2) , 129-131
- https://doi.org/10.1063/1.93012
Abstract
Previous studies have shown that coevaporated metal-dielectric composite films are quite smooth. But a substantially higher deposition temperature results in the surface roughness of Mo/Al2O3 composite films becoming larger than the mean film thickness. This effect was applied to photothermal solar absorbers where, for the first time, a stable selective absorber was produced which absorbs over 99% of the solar spectrum. These results have implications for other surface roughness dependent effects.Keywords
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