INFLUENCE OF ROTATION RATE ON OPTICAL PROPERTIES OF ZnS THIN FILMS ANALYZED BY SPECTROSCOPIC ELLIPSOMETRY METHOD

Batool Ahmadi Khanegahi and Hassan Sedghi ()
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Batool Ahmadi Khanegahi: Department of Physics, Urmia University, Urmia, Iran
Hassan Sedghi: Department of Physics, Urmia University, Urmia, Iran

Surface Review and Letters (SRL), 2020, vol. 27, issue 01, 1-7

Abstract: In the present work, zinc sulfide thin films were deposited on glass substrates by sol–gel process with different coating speeds 3600, 4800, 6000 and 7200rpm. Zinc acetate (Zn(CH3COO)2⋅2H2O) and thiourea (CH4N2S) were used as precursors. Two-methoxyethanol and monoethanolamine were used as solvent and stabilizer, respectively. The optical properties of ZnS thin films such as refractive index, extinction coefficient, dielectric function and optical band gap energy of the films were obtained by spectroscopic ellipsometry (SE) analysis method in the wavelength range of 300–800nm. The incidence angle of the layers was kept at 70∘. The measured SE parameters Ψexp and Δexp are fitted against the designed model by minimizing the mean square error (MSE). Considering the data obtained, it can be deduced that the optical properties of ZnS films are highly influenced by rotation rates. The extinction coefficients of the films were increased with increasing rotation rates of the films. From these results, it is found that the energy gap of the ZnS films increases with increasing rotation rates of the films in the range of 3.13–3.20eV.

Keywords: Spectroscopic ellipsometry; rotation rate; thin film; zinc sulfide; optical properties (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19500926

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