Physics Scripta, ( ISI ), Volume (85), No (1), Year (2012-1) , Pages (157031-157036)

Title : ( Structural, electrical, optical, thermoelectrical and photoconductivity properties of the SnO2–Al2O3 binary transparent conducting films deposited by the spray pyrolysis method )

Authors: F. Moharrami , M.-M. Bagheri-Mohagheghi , H. Azimi-Juybari , Mehrdad Shokooh-Saremi ,

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Abstract

In this paper, the SnO2–Al2O3 binary thin-film system has been deposited on a glass substrate by the spray pyrolysis technique. The effect of aluminum concentration on the structural, electrical, thermoelectrical, optical and photoconductivity properties of films was studied. The [Al]/[Sn] atomic ratio was in the range 0–100 at.% in solution. X-ray diffraction analysis shows that all films with different doping levels have polycrystalline SnO2 cassiterite phase. At doping levels of 40 at.% and above, the Al2O3 phase was observed and the sheet resistance of the films increased with increasing Al doping in the ranges from 5 at.% to less than 40 at.% and more than 60 at.% due to the substitution of Al3+ with Sn4+. Minimum sheet resistance of films was found in the range 40–60 at.%. Using Hall effect measurements, the majority carriers concentration obtained was of the order of 1018 cm−3. Hall effect and thermoelectrical measurements show that at doping levels between 10 and 20% and also higher than 60 at.%, majority carriers change from electrons (n-type conduction) to holes (p-type conduction). Also, a higher Seebeck coefficient value equal to −341μVK−1 was obtained for the 30 at.% Al-doping level. The average transmittance of the films at low doping levels was about 75–90%. The photoconductivity properties of SnO2–Al2O3 thin films increased with increasing doping level.

Keywords

, 78.40.Fy, 81.15.Fg, 87.85.jc, 73.61.Jc
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@article{paperid:1025160,
author = {F. Moharrami and M.-M. Bagheri-Mohagheghi and H. Azimi-Juybari and Shokooh-Saremi, Mehrdad},
title = {Structural, electrical, optical, thermoelectrical and photoconductivity properties of the SnO2–Al2O3 binary transparent conducting films deposited by the spray pyrolysis method},
journal = {Physics Scripta},
year = {2012},
volume = {85},
number = {1},
month = {January},
issn = {0031-8949},
pages = {157031--157036},
numpages = {5},
keywords = {78.40.Fy; 81.15.Fg; 87.85.jc; 73.61.Jc},
}

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%0 Journal Article
%T Structural, electrical, optical, thermoelectrical and photoconductivity properties of the SnO2–Al2O3 binary transparent conducting films deposited by the spray pyrolysis method
%A F. Moharrami
%A M.-M. Bagheri-Mohagheghi
%A H. Azimi-Juybari
%A Shokooh-Saremi, Mehrdad
%J Physics Scripta
%@ 0031-8949
%D 2012

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