Graded-index Pt-Al2O3 composite solar absorbers

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

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)29-31
Number of pages3
JournalApplied Physics Letters
Issue number1
StatePublished - 1981

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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