Journal
APPLIED SURFACE SCIENCE
Volume 307, Issue -, Pages 558-565Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2014.04.073
Keywords
ZnO Ellipsometric parameters; Optical constants; Depolarization Bandgap energy; Gaussian oscillator
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Funding
- Deanship of Scientific Research at the University of Dammam [2012155]
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Zinc oxide (ZnO) films were prepared on Si(1 1 1) and quartz substrates using RF-magnetron sputtering in N2 plasma at room temperature. From the X-ray diffraction observations, it was found that all films are polycrystalline with a preferred orientation of (1 0 1). X ray photoelectron spectroscopy was used to analyze the chemical composition of the films by observing the behavior of the Zn2p3, Ols, N1 s, and Cl s lines. The thicknesses and optical constants of the ZnO thin films were determined using variable angle spectroscopic ellipsometry through the GenoscTM Herzinger-Johs parameterized semiconductor oscillator functions and multiple Gaussian oscillator models. Combining multiple oscillator types provided a very flexible approach to fitting optical constants over a wavelength range 190-1400 nm while simultaneously enforcing Kramers-Kronig consistency in the fitted ellipsometric parameters. Refractive indices of the films were determined to be in the range 1.68-1.93 and extinction coefficients in the range 4.56 10-6-0.23.A direct bandgap of 3.38 + 0.03 eV was calculated from the extinction coefficient. Low temperature photoluminescence studies of the films exhibited one prominent peak at 3.41 eV. The equality of the ZnO thin films was obtained through the depolarization measurements. C) 2014 Elsevier B.V. All rights reserved.
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