TY - JOUR
T1 - The effect of Zn 2+ on the anion vacancies in ZnO thin-films grown using chemical bath deposition.
AU - Molefe, F. V.
AU - Mofokeng, S. J.
AU - Khenfouch, M.
AU - Achehboune, M.
AU - Dhlamini, M. S.
AU - Mothudi, B. M.
AU - Koao, L. F.
N1 - Funding Information:
This work was supported financially by the National research Foundation (NRF) of South Africa in the College of Science Engineering and Technology (CSET) at the University of South Africa (UNISA).
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2019/9/3
Y1 - 2019/9/3
N2 - Zinc Oxide (ZnO) thin-films were grown on glass substrate using chemical bath deposition method (CBD) from precursors containing varying molar concentrations of zinc acetate. The structure, morphology, optical and luminescence properties of the films were investigated using X-ray diffraction (XRD), Scanning electron microscopy (SEM), Ultraviolet visible spectroscopy (UV/VIS/NIR) and Photoluminescence spectroscopy (PL). The XRD result showed that at low molar concentrations of zinc acetate the structure consists of Zn(OH)2 and ZnO phases. As the molar concentration of zinc acetate increases the well-known hexagonal wurtzite structure of ZnO was developed. The average crystalite size estimated using Scherrer's formula was about 41.19 nm. It was found that the average crystallite size increased with an increase in the molar concentration of zinc acetate. SEM observations showed the presence of nanoparticles forming aggregated nanoflakes. The surface morphology was found to be dependent on the concentration of zinc acetate. The UV-Vis spectra showed that the absorption band edge shift to the higher wavelength with an increase in molar concentration of zinc acetate. The band gap energy of ZnO thin-films determined from UV reflectance spectra was found to decrease from 3.17 to 2.73 eV with an increase in the zinc acetate concentration. The PL results showed that the luminescence intensities decrease with an increase in the molar concentration of zinc acetate without any noticeable shift in position.
AB - Zinc Oxide (ZnO) thin-films were grown on glass substrate using chemical bath deposition method (CBD) from precursors containing varying molar concentrations of zinc acetate. The structure, morphology, optical and luminescence properties of the films were investigated using X-ray diffraction (XRD), Scanning electron microscopy (SEM), Ultraviolet visible spectroscopy (UV/VIS/NIR) and Photoluminescence spectroscopy (PL). The XRD result showed that at low molar concentrations of zinc acetate the structure consists of Zn(OH)2 and ZnO phases. As the molar concentration of zinc acetate increases the well-known hexagonal wurtzite structure of ZnO was developed. The average crystalite size estimated using Scherrer's formula was about 41.19 nm. It was found that the average crystallite size increased with an increase in the molar concentration of zinc acetate. SEM observations showed the presence of nanoparticles forming aggregated nanoflakes. The surface morphology was found to be dependent on the concentration of zinc acetate. The UV-Vis spectra showed that the absorption band edge shift to the higher wavelength with an increase in molar concentration of zinc acetate. The band gap energy of ZnO thin-films determined from UV reflectance spectra was found to decrease from 3.17 to 2.73 eV with an increase in the zinc acetate concentration. The PL results showed that the luminescence intensities decrease with an increase in the molar concentration of zinc acetate without any noticeable shift in position.
UR - http://www.scopus.com/inward/record.url?scp=85073732280&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/1292/1/012016
DO - 10.1088/1742-6596/1292/1/012016
M3 - Article
AN - SCOPUS:85073732280
SN - 1742-6588
VL - 1292
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012016
T2 - 2nd International Online Conference on Nanoscience and Nanotechnology, NANO 2018
Y2 - 29 December 2018 through 30 December 2018
ER -