CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Influences of Pr and Ta doping concentration on the characteristic features of FTO thin film deposited by spray pyrolysis |
Güven Turguta, Adem Koçyiğitb, Erdal Sönmezc |
a Erzurum Technical University, Science Faculty, Department of Basic Sciences, Erzurum 25240, Turkey; b Igdir University, Engineering Faculty, Department of Electrical Electronic Engineering, Igdir 7600, Turkey; c Ataturk University, Kazım Karabekir Education Faculty, Department of Physics, Erzurum 25240, Turkey |
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Abstract The Pr and Ta separately doped FTO (10 at.% F incorporated SnO2) films are fabricated via spray pyrolysis. The microstructural, topographic, optical, and electrical features of fluorine-doped TO (FTO) films are investigated as functions of Pr and Ta dopant concentrations. The x-ray diffraction (XRD) measurements reveal that all deposited films show polycrystalline tin oxide crystal property. FTO film has (200) preferential orientation, but this orientation changes to (211) direction with Pr and Ta doping ratio increasing. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) analyses show that all films have uniform and homogenous nanoparticle distributions. Furthermore, morphologies of the films depend on the ratio between Pr and Ta dopants. From ultraviolet-visible (UV-Vis) spectrophotometer measurements, it is shown that the transmittance value of FTO film decreases with Pr and Ta doping elements increasing. The band gap value of FTO film increases only at 1 at.% Ta doping level, it drops off with Pr and Ta doping ratio increasing at other doped FTO films. The electrical measurements indicate that the sheet resistance value of FTO film initially decreases with Pr and Ta doping ratio decreasing and then it increases with Pr and Ta doping ratio increasing. The highest value of figure of merit is obtained for 1 at.% Ta- and Pr-doped FTO film. These results suggest that Pr- and Ta-doped FTO films may be appealing candidates for TCO applications.
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Received: 01 April 2015
Revised: 02 May 2015
Accepted manuscript online:
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PACS:
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73.20.At
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(Surface states, band structure, electron density of states)
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78.20.-e
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(Optical properties of bulk materials and thin films)
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78.68.+m
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(Optical properties of surfaces)
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Corresponding Authors:
Güven Turgut, Adem Koçyiğit
E-mail: guventrgt@gmail.com;adem.kocyigit@igdir.edu.tr
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Cite this article:
Güven Turgut, Adem Koçyiğit, Erdal Sönmez Influences of Pr and Ta doping concentration on the characteristic features of FTO thin film deposited by spray pyrolysis 2015 Chin. Phys. B 24 107301
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