A Study on Effect of Sol Aging Time on Optical Properties of ZnO Thin Films: Spectroscopic Ellipsometry Method

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Author(s): Ehsan Motallebi Aghkonbad, Maryam Motallebi Aghgonbad, Hassan Sedghi.

Journal Name: Micro and Nanosystems

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In the current work, a series of ZnO thin films were deposited on glass substrates using solgel method to investigate the change in optical behavior of the film with sol aging time (as-prepared, 8, 16, 24 and 32 hours) and the annealing temperature (300ᵒC and 500ᵒC). The optical properties of thin films were explored using spectroscopic ellipsometry method including the real and imaginary part of refractive index (n,k), real and imaginary part of dielectric function (!!, !!) and band gap energy of the layers in the 300-900 nanometer wavelength range. It can be deduced from the results that sol aging time and annealing temperature, affect the optical properties of the samples. The films prepared using 24 h aged solution, had the highest transmittance and the largest band gap energy. Using single oscillator energy model of Wemple and Di Domenico parameters such as free charge carrier concentration ratio to effective mass N/m*, and plasma frequency ωp, were calculated.

Keywords: ZnO, spectroscopic ellipsometry, sol aging time, annealing temperature

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(E-pub Ahead of Print)
DOI: 10.2174/1876402911666190313155304