Affiliation:
1. Department of physics, Faculty of science, Urmia University, Urmia, Iran
Abstract
Background:
Due to wide band gap and large excitonic binding energy, being inexpensive,
abundance in nature and easy synthesis ZnO is a promising candidate in many applications such as solar
cells.
Experimental:
In the current work a series of ZnO thin films were deposited on glass substrates using
sol-gel method to investigate the change in optical behavior of the film with sol aging time (asprepared,
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, real and imaginary part of dielectric function and band gap energy of
the layers in the 300-900 nanometer wavelength range.
Results:
It can be deduced from the results that sol aging time and annealing temperature, affect the optical
properties of the samples. Using single oscillator energy model of Wemple and Di Domenico parameters
such as free charge carrier concentration ratio to effective mass, and plasma frequency, were calculated.
Conclusion:
The films prepared using 24 h aged solution, had the highest transmittance and the largest
band gap energy.
Publisher
Bentham Science Publishers Ltd.
Subject
Building and Construction
Cited by
3 articles.
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