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SPECTROSCOPIC ELLIPSOMETRY INVESTIGATION ON OPTICAL PROPERTIES OF Fe:SNO₂ THIN FILMS: EFFECTS OF IRON CONCENTRATION

SAHAR MORADI

Department of Physics, Urmia University, Urmia, Iran

E-mail Address: moradisahar884@gmail.com

Corresponding author.

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and

HASSAN SEDGHI

Department of Physics, Urmia University, Urmia, Iran

E-mail Address: H.sedghi@urmia.ac.ir

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https://doi.org/10.1142/S0218625X20500444Cited by:2 (Source: Crossref)

Abstract

Nanostructured Fe:SnO₂ thin films were deposited on glass substrates through sol–gel spin coating method. Films were synthesized with different iron quantities including 0%, 4%, 8% and 12% (wt.%). The effects of Fe concentration on optical properties of films were investigated by spectroscopic ellipsometry (SE) technique. SE measured ( $Ψ, Δ$ $Ψ, Δ$ ) parameters for films in the wavelength range between 300nm to 800nm. Optical properties including the refractive index, extinction coefficient, transmittance, dielectric constants and optical conductivity were determined by fitting the SE measured ( $Ψ, Δ$ $Ψ, Δ$ ) parameters and data obtained from the optical model-based analysis. Results showed that the transmittance values increase by increment of Fe concentration from 0% to 12%. The bandgap energy ( $E_{g})$ $E_{g})$ of prepared thin films was also calculated. $E_{g}$ $E_{g}$ values were between 3.44 and 3.58eV. Dispersion parameters including the high frequency dielectric constant ( $ε_{\infty})$ $ε_{\infty})$ and the ratio of free carrier concentration to effective mass (N/m $^{*})$ $^{*})$ were then obtained for the prepared films.

Keywords:

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