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A systematic investigation on physical properties of spray pyrolysis–fabricated CdS thin films for opto-nonlinear applications: An effect of Na doping

Published online by Cambridge University Press:  10 February 2020

M. Aslam Manthrammel
Affiliation:
Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, Saudi Arabia; and Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia
Mohd. Shkir*
Affiliation:
Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, Saudi Arabia; and Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia
S. Shafik
Affiliation:
Thin Film Physics Laboratory, Department of Physics, Electronics and Photonics, Rajarshi Shahu Mahavidyalaya, Latur, Maharashtra 413512, India
Mohd. Anis
Affiliation:
Department of Physics and Electronics, Maulana Azad College of Arts, Science and Commerce, Aurangabad,, Maharashtra 431001, India
S. AlFaify*
Affiliation:
Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha 61413, Saudi Arabia; and Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia
*
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

The present work investigates the influence of sodium doping on structural, morphological, photoluminescence, linear, nonlinear (NL), and optical limiting (OL) parameters of NaxCd1−xS thin films (where x= 0.0, 0.5, 1.0, 2.5, and 5.0 wt%) deposited on glass substrates using spray pyrolysis route. X-ray diffraction and Raman analyses confirmed the hexagonal polycrystalline nature of films. Crystallite sizes were decreased from 30 to 17 nm with doping. Scanning electron microscopy (SEM) micrographs also confirmed the nanocrystalline spherical growth. Energy dispersive X-ray spectroscopy (EDS) and SEM mapping studies revealed the presence and homogeneous distribution of individual elements. Transmission of films is found to lie between 45 and 60%. Although the low doping caused the reduction of the effective band gap, higher doping caused a blue shift in band gap, with an associated reduction in crystallite sizes. The refractive index values are found within 1–2 in visible and their maximum values (in range 2.65–3.16) are observed at 2500 nm. Photoluminescence (PL) spectra showed broad emission peak at 520 ± 10 nm. Dielectric and NL analyses were also carried out. OL results were promising for the systematic gradual decrease of intensity from 100 to 72%, with doping for power regulating applications.

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Copyright © Materials Research Society 2020

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