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Influence of Cu‐Doping on Linear and Nonlinear Optical Properties of High‐Quality ZnO Thin Films Obtained by Spin‐Coating Technique
Author(s) -
Mohammedi Abdelkader,
Ibrir Miloud,
Meglali Omar,
Berri Saadi
Publication year - 2021
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000472
Subject(s) - materials science , spin coating , refractive index , thin film , scanning electron microscope , nanorod , doping , band gap , copper , dispersion (optics) , substrate (aquarium) , analytical chemistry (journal) , energy dispersive x ray spectroscopy , spectroscopy , optics , optoelectronics , composite material , nanotechnology , chemistry , metallurgy , oceanography , physics , chromatography , geology , quantum mechanics
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 E o , E d , and n ∞ , the nonlinear refractive index, and nonlinear optical susceptibility are calculated and interpreted.