Graded-index Pt-Al2O3 composite solar absorbers

H. G. Craighead; R. E. Howard; J. E. Sweeney; R. A. Buhrman

doi:10.1063/1.92552

Graded-index Pt-Al₂O₃ composite solar absorbers

H. G. Craighead, R. E. Howard, J. E. Sweeney, R. A. Buhrman

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43 Scopus citations

Abstract

The solar absorption properties of thin composite films of coevaporated Pt and Al₂O₃, formed with a graded composition-depth profile, are compared to those of an identical film overcoated with a microscopically textured layer of SiO_x. The composition grade of the metal-dielectric composite and the surface texturing of the SiO_x produces a film with a refractive index slowly varying to unity at the front surface. This results in a very low reflectance of the film. The solar absorptivity of this graded refractive index surface is shown to be a high as 0.98. The production and structure of these surfaces are described as well as a general method of absorptivity enhancement using a microscopically textured surface formed by reactive ion etching.

Original language	English (US)
Pages (from-to)	29-31
Number of pages	3
Journal	Applied Physics Letters
Volume	39
Issue number	1
DOIs	https://doi.org/10.1063/1.92552
State	Published - 1981

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.92552

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abstract = "The solar absorption properties of thin composite films of coevaporated Pt and Al2O3, formed with a graded composition-depth profile, are compared to those of an identical film overcoated with a microscopically textured layer of SiOx. The composition grade of the metal-dielectric composite and the surface texturing of the SiOx produces a film with a refractive index slowly varying to unity at the front surface. This results in a very low reflectance of the film. The solar absorptivity of this graded refractive index surface is shown to be a high as 0.98. The production and structure of these surfaces are described as well as a general method of absorptivity enhancement using a microscopically textured surface formed by reactive ion etching.",

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AU - Craighead, H. G.

AU - Howard, R. E.

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N2 - The solar absorption properties of thin composite films of coevaporated Pt and Al2O3, formed with a graded composition-depth profile, are compared to those of an identical film overcoated with a microscopically textured layer of SiOx. The composition grade of the metal-dielectric composite and the surface texturing of the SiOx produces a film with a refractive index slowly varying to unity at the front surface. This results in a very low reflectance of the film. The solar absorptivity of this graded refractive index surface is shown to be a high as 0.98. The production and structure of these surfaces are described as well as a general method of absorptivity enhancement using a microscopically textured surface formed by reactive ion etching.

AB - The solar absorption properties of thin composite films of coevaporated Pt and Al2O3, formed with a graded composition-depth profile, are compared to those of an identical film overcoated with a microscopically textured layer of SiOx. The composition grade of the metal-dielectric composite and the surface texturing of the SiOx produces a film with a refractive index slowly varying to unity at the front surface. This results in a very low reflectance of the film. The solar absorptivity of this graded refractive index surface is shown to be a high as 0.98. The production and structure of these surfaces are described as well as a general method of absorptivity enhancement using a microscopically textured surface formed by reactive ion etching.

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Graded-index Pt-Al₂O₃ composite solar absorbers

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