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Influence of yttrium doping on the structural, morphological and optical properties of nanostructured ZnO thin films grown by spray pyrolysis

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Bazta, Otman and Urbieta Quiroga, Ana Irene and Piqueras de Noriega, Javier and Fernández Sánchez, Paloma and Addou, M. and Calvino, J.J. and Hungría, A.B. (2019) Influence of yttrium doping on the structural, morphological and optical properties of nanostructured ZnO thin films grown by spray pyrolysis. Ceramics international, 45 (6). pp. 6842-6852. ISSN 0272-8842

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Official URL: http://dx.doi.org/10.1016/j.ceramint.2018.12.178


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Abstract

This study reports on the deposition of highly transparent, n-type ZnO thin films on glass substrate at 450 C using spray pyrolysis processing, with the simultaneous insertion of yttrium (Y) at different percentages (0, 2, 5, 7 at%) as a dopant. The effect of Y doping on the structure, morphology and optical properties of Y doped ZnO (ZnO:Y) was investigated for optoelectronic applications. The obtained thin films were characterized by means of X-ray diffraction, field-emission scanning electron microscopy (FESEM), UV visible absorbance measurements, photoluminescence (PL) and cathodoluminescence (CL) spectroscopy. The as-prepared films exhibit well-defined hexagonal wurtzite structure grown along [002]. Field emission scanning electron microscope micrographs of the pure ZnO and ZnO:Y showed that the films acquired a dominance of hexagonal-like grains, the morphology was influenced by Y incorporation. All the films showed high transparency in the visible domain with an average transmittance of 83%. The band gap energy, Eg, increased from 3.12 eV to 3.18 eV by increasing the Y doping concentration up to 5 at% and then decreased to 3.15 eV for 7 at% Y content. The PL and CL measurements reveal a strong ultraviolet (UV) emission, suggesting that the as-prepared ZnO:Y thin films can potentially be used in optoelectronic devices.


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©2019 Elsevier Science
This work was supported by MINECO/FEDER (MAT 2016-81118-P and MAT 2015-65274-R). O.B. thanks Aula del Estrecho fellowship.

Uncontrolled Keywords:Zinc-oxide; Electrical-properties; Photoluminescence properties; Hydrothermal synthesis; Al; Microstructure; Luminescence; Optimization; Temperature; Dependence; Films; Optical properties; Zno; Y doped; Spray pyrolysis
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:55074
Deposited On:08 May 2019 18:17
Last Modified:08 May 2019 18:17

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