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Proceedings Paper

Roughened, Graded-Index, Cermet Photothermal Absorbers With Very High Absorptivities
Author(s): Glen A. Nyberg; H. G. Craighead; R. A. Buhrman
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Paper Abstract

Mo/A1203, composite coatings are shown to be useful in the fabrication of stable, effi-cient, selective solar absorbers. One such absorber deposited at 400°C showed no decrease in its solar absorptivity after 33 days in 500°C air. It was found that a higher substrate temperature during deposition can induce a surprisingly large surface roughness in these co-evaporated Mo/Al203 composites. This effect, when combined with grading the cermet composition, was used to produce solar absorptivities greater than 0.99 with a calculated thermal emissivity of 0.20 at 500°C, but it also resulted in a decrease in thermal stability in air. Regardless of the degree of surface roughness, all absorbers were stable in vacuum, to 750°C.

Paper Details

Date Published: 12 April 1982
PDF: 7 pages
Proc. SPIE 0324, Optical Coatings for Energy Efficiency and Solar Applications, (12 April 1982); doi: 10.1117/12.933263
Show Author Affiliations
Glen A. Nyberg, Cornell University (United States)
H. G. Craighead, Cornell University (United States)
R. A. Buhrman, Cornell University (United States)


Published in SPIE Proceedings Vol. 0324:
Optical Coatings for Energy Efficiency and Solar Applications
Carl M. Lampert, Editor(s)

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