Interconnections between Electronic Structure and Optical Properties of Multilayer Nanolaminate TiAlN/Ag and Al2O3/Ag Coatings

Multilayer nanolaminate TiAlN/Ag and Al2O3/Ag metal-insulator-metal (MIM) coatings with thicknesses of individual layers from a few to several hundreds of nanometers were fabricated by direct current magnetron sputtering. Their optical transmittance and reflectance spectra were measured for photon e...

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Bibliographic Details
Published in:Coatings (Basel) 2018-08, Vol.8 (8), p.290
Main Authors: Wainstein, Dmitry, Kovalev, Anatoly, Vakhrushev, Vladimir, Gago, Raul, Endrino, Jose
Format: Article
Language:English
Subjects:
Aluminum oxide
Architectural engineering
Banded structure
Coatings
Correlation analysis
Direct current
Electronic structure
Heat conductivity
Infrared reflection
Insulators
Light
Light reflection
Localization
Magnetron sputtering
Microelectromechanical systems
Multilayers
Nanocomposites
Nanostructured materials
Optical properties
Optics
Parameters
Photovoltaic cells
Plasmons
Reflectance
Silver
Solar energy
Statistical analysis
Thickness
Thin film coatings
Transmittance
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Summary:Multilayer nanolaminate TiAlN/Ag and Al2O3/Ag metal-insulator-metal (MIM) coatings with thicknesses of individual layers from a few to several hundreds of nanometers were fabricated by direct current magnetron sputtering. Their optical transmittance and reflectance spectra were measured for photon energies 1–5 eV (1240–248 nm). The spectra were non-monotonous as their transmission and reflection bands were strongly dependent on the coating architecture. A set of advanced electron spectroscopy methods was used to analyse the electronic structure of the coatings controlling optical properties. Energies of plasmons peaks and the distribution of their intensities are functions of the Ag layers thickness as well as the composition and thickness of the dielectric nanolayers in the MIM nanocomposite. Statistical analysis established the cross-correlations between geometrical parameters of the coatings, transmissions and reflection bands on the optical spectra and parameters of the electronic structure. Particularly, the blue side of the transmittance band is controlled by plasmons while the dielectric band gap determines the transmittance of the red side. The obtained experimental results allowed us to fulfil the computed architectural design of a multilayer Al2O3/Ag coating with a narrow bandwidth in the visible light region and strong reflection in the infrared and ultraviolet regions.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings8080290