Structural and optical properties of phosphorous and antimony doped ZnO thin films deposited by spray pyrolysis: a comparative study
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Date
2017Author
Nyarige, Justine S
Sebastian, Waita
Simiyu, Justus
Mureramanzi, Silas
Aduda, Benard
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
A study of structural and properties of pure (undoped) Zinc oxide (ZnO) and phosphorous (P) and Antimony
(Sb) doped Zinc Oxide films has been carried out. The films were deposited by an automated spray pyrolysis
equipment on both microscope glass at various elevated temperatures (270 oC - 420 oC) and on fluorine doped tin
Oxide (FTO) substrates at 420 oC. Structural characterization using Raman spectroscopy showed the presence of the
main peak for ZnO at 437 cm-1
for all the films. Antimony doped films showed other peaks associated with the doping
but phosphorous doping did not show extra peaks. Optical characterization using a UV-VIS-NIR Shimadzu (Model
DUV 3700) double beam spectrophotometer provided both reflectance and transmittance data and Scout software was
used to compute the band gap. At a wavelength of 600 nm, the average transmittance of the pure ZnO films was ~62
% while it was transmittance was ~85 % and ~80 % for Sb and P doped films respectively, an increase of ~23 % and
~18 % respectively. For the undoped ZnO films, high deposition temperatures led to band gap narrowing from 3.25eV
to 3.10eVwhile doping resulted in band gap widening from 3.10 eV to 3.30 eV (for P-doped) and 3.10 eV to 3.33 eV
(for Sb-doped),an observation confirmed by the increased transmittance on doping. The band gap narrowing for ZnO
films makes the film become a better materials for visible light absorption which is good for photovoltaic applications.
The wide gap broadening on doping makes the film more transparent to solar radiation making it suitable for
transparent conducting oxide applications.
Citation
Nyarige, Justine Sageka, et al. "Structural and Optical Properties of Phosphorous and Antimony doped ZnO thin films Deposited by Spray Pyrolysis: A Comparative Study."Publisher
University of Nairobi
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Attribution-NonCommercial-NoDerivs 3.0 United StatesUsage Rights
http://creativecommons.org/licenses/by-nc-nd/3.0/us/Collections
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