Influence of Cu-Doping on Linear and Nonlinear Optical Properties of High-Quality ZnO Thin Films Obtained by Spin-Coating Technique
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Date
2022
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Publisher
Université de M'sila
Abstract
To study the effect of Cu concentration on morphological, structural, linear and
nonlinear optical properties, copper-doped ZnO thin films are grown by sol–gel/
spin-coating technique on the glass substrates. Scanning electron microscopy
(SEM) images reveal that the surface morphology is homogeneous with good
adhesion to the glass substrate. The energy dispersive X-ray spectroscopy (EDS)
spectra confirm that Zn, O, and Cu elements are present in ZnO films. The X-ray
diffraction (XRD) pattern of Cu-doped ZnO is dominated by (002) peak, indicating
an upstanding ZnO nanorods array growing along the c-axis. The optical
bandgap of Cu-doped ZnO thin films, calculated from optical transmission
spectra, is found to decrease with the increase in copper concentration. The
refractive index dispersion curve of ZnO films is subjected to the single-oscillator
model. The optical dispersion parameters Eo, Ed, and n∞, the nonlinear refractive
index, and nonlinear optical susceptibility are calculated and interpreted