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Article http://dx.doi.org/10.26855/oajrcms.2024.03.001

Optical Constants of Nanofilms for Spectrally Selective Windows

Winston T. Ireeta1, Edward Bwayo1,2,*, Daniel Mukiibi1, Denis Okello1, Willy Okullo1, Robert Lugolole1

1Department of Physics, School of Physical Sciences, College of Natural Sciences, Makerere University, Kampala, Uganda.

2Department of Physics, Faculty of Science, Muni University, Arua, Uganda.

*Corresponding author:Edward Bwayo

Published: April 2,2024

Abstract

In this work, a spectral analysis of the effect of deposition angle on the optical constants for optically selective windows was carried out. The coatings of ZnS/Ag nanostructures were deposited on glass substrates from 0o to 60o. The measured transmittance increased with an increase in the deposition angle of silver nanofilms in the visible region but decreased with an increase in the deposition of silver in the infrared region. The transmittance decreased with an increase in the deposition angle of zinc sulfide in the visible region. Still, it increased with an increase in the deposition angle of zinc sulfide in the infrared region. The reflectance decreased with an increase in the deposition angle of silver nanoparticles in the visible region but decreased with an increase in the deposition angle of zinc sulfide. The effective refractive index increased from 3.25 in the visible spectrum to 6.2 in the infrared spectrum. The low values of the effective refractive index at visible wavelengths imply that the nanofilms were transparent to visible light. The extinction coefficient increased from an average of 0.2 at a wavelength of 400nm toward the infrared spectral band. The increase in deposition of ZnS did not significantly affect the energy band gap. However, the increase in the deposition angle of silver increased the energy band of the nanofilms from 3.52 to 3.99 eV.

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How to cite this paper

Optical Constants of Nanofilms for Spectrally Selective Windows

How to cite this paper: Winston T. Ireeta, Edward Bwayo, Daniel Mukiibi, Denis Okello, Willy Okullo, Robert Lugolole. (2024) Optical Constants of Nanofilms for Spectrally Selective WindowsOAJRC Material Science, 6(1), 1-11.

DOI: http://dx.doi.org/10.26855/oajrcems.2024.03.001