Linear and nonlinear optical investigations of N:ZnO/ITO thin films system for opto-electronic functions
authors Arif, M; Shkir, M; AlFaify, S; Sanger, A; Vilarinho, PM; Singh, A
nationality International
journal OPTICS AND LASER TECHNOLOGY
author keywords N:ZnO; X-ray diffraction; FT-Raman; Optical properties; Nonlinear properties
keywords ENHANCED FIELD-EMISSION; ZINC-OXIDE; ELECTRICAL-PROPERTIES; ZNO FILMS; PHOTOCATALYTIC ACTIVITY; AL; CONDUCTIVITY; GROWTH; HYDROGEN; FACILE
abstract Different concentrations of N (0, 1, 3 and 5 wt.%) added ZnO thin films were primed using spin coater. X-ray diffraction (XRD) patterns confirm the preferred growth orientation of all films along (0 0 2) plane, however, ITO has dominant features owing to low thickness of the films. XRD along with vibrational spectroscopy confirms the single hexagonal phase of ZnO. The crystallite size evaluated from Scherrer's equation increased with increase in N-doping concentrations and is found to lie in the range of 25-36 nm. The increased crystallite size reduces the dislocation density which confirms the reduction of defects in the films. The dislocation density (delta) is found to be 1.569, 1.369, 0.984, and 0.965 for 0, 1, 3 and 5 wt.% N doped ZnO films. N doping in ZnO was confirmed by EDX analysis and its homogeneous distribution was further confirmed by SEM mapping. AFM study confirms the formation of spherical nanoparticles whose size increase with increase in N doping, validating the XRD results. The films are found to have similar to 80% transparency which is quite impressive from window layer application point of view. Absorption edge is found to be red shifted owing to N doping, indicating a reduction in energy gap. Hence energy gap was evaluated using Tauc's relation and is found to reduce from 3.43 to 3.14 eV (Delta E = 0.29 eV) with in content of N-doping. The absorption index, refractive index, real and imaginary dielectric constants were also estimated. The values of chi((1)) and chi((3)) are estimated to be in range of 0.3-9 and 1.0 x 10(-11) -1.0 x 10(-8) , respectively. The Nanocrystalline films with spherical nanocrystallites, high optical transparency and non-linear properties recommend their application in opto-electronic technology.
publisher ELSEVIER SCI LTD
issn 0030-3992
isbn 1879-2545
year published 2019
volume 112
beginning page 539
ending page 547
digital object identifier (doi) 10.1016/j.optlastec.2018.11.006
web of science category Optics; Physics, Applied
subject category Optics; Physics
unique article identifier WOS:000458941800066
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journal analysis (jcr 2019):
journal impact factor 3.233
5 year journal impact factor 3.041
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