Spectrally selective energy-saving coatings based on reactively sputtered bismuth oxide thin films

M. F. Al-Kuhaili*, M. E. Daoud, M. B. Mekki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Spectrally selective coatings are multilayer structures that are deposited on glass. These structures consist of a metal/dielectric bi-layer, in which the metal is silver and the dielectric is a wide-bandgap semiconductor with a high refractive index. These layers are typically very thin (> 30 nm), and thus may be etched away if deposited by a sputtering process. This work has two objectives. First, a new design is fabricated that can sustain the sputtering process. Second, a high-refractive-index material (i.e., bismuth oxide) is selected to serve as the dielectric. Bismuth oxide is deposited by reactive direct-current sputtering, and the deposition parameters are optimized to yield films that are suitable for use in spectrally selective coatings. When used in a silver-based multilayer structure, the resulting peak visible transmittance was 68%, and the maximum infrared reflectance was 85%.

Original languageEnglish
Pages (from-to)449-463
Number of pages15
JournalOptical Materials Express
Issue number2
StatePublished - 1 Feb 2020

Bibliographical note

Funding Information:
This work was supported by the Physics Department of King Fahd University of Petroleum and Minerals.

Publisher Copyright:
© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials


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