Thermochromic and opacity behaviors in vanadium dioxide nanofilms: a theoretical study

Vanadium dioxide nanofilms are one of the most essential materials in electronic applications like smart windows. Therefore, studying and understanding the optical properties of such films is crucial to modify the parameters that control these properties. To this end, this work focuses on investigat...

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Bibliographic Details
Published in:Materials research express 2022-01, Vol.9 (1), p.15007
Main Authors: Shallal, Ikhlas H, Abdul-Ameer, Nidhal M, Abdul-Hasan, Shaymaa Q, Abdulrida, Moafak C
Format: Article
Language:English
Subjects:
absorption coefficient
extinction coefficient
Insulation
Opacity
Optical properties
Parameter modification
Red shift
refractive index
Refractivity
Smart materials
Thickness
Vanadium dioxide
vanadium dioxides nanofilm
Windows (apertures)
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Summary:Vanadium dioxide nanofilms are one of the most essential materials in electronic applications like smart windows. Therefore, studying and understanding the optical properties of such films is crucial to modify the parameters that control these properties. To this end, this work focuses on investigating the opacity as a function of the energy directed at the nanofilms with different thicknesses (1–100) nm. Effective mediator theories (EMTs), which are considered as the application of Bruggeman’s formalism and the Looyenga mixing rule, have been used to estimate the dielectric constant of VO 2 nanofilms. The results show different opacity behaviors at different wavelength ranges (ultraviolet, visible, and infrared). The results depict that the highest opacity of the insulating phase is achieved at the ultraviolet region and it reduces for the metal phase. Besides, the results demonstrate that the opacity possesses a redshift during the changes at the three phases. Regarding the infrared region, the lowest opacity value is achieved at the insulator phase and it increases to the highest value at the metal phase. In the visible region, the opacity behavior remains similar in the three phases. It is worth noting that the lowest opacity is found for thinner nanofilm. Since both the refractive index and the extinction index are among the most essential optical constants, hence, both of them were compared with the experiment results, and an excellent agreement is achieved between them.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/ac4733