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Fe-doped SnO2 transparent semi-conducting thin films deposited by spray pyrolysis technique : Thermoelectric and p-type conductivity properties
In this paper, we report structural, electrical, optical, and especially thermoelectrical characterization of iron (Fe) doped tin oxide films, which have been deposited by spray pyrolysis technique. The doping level has changed from 0 to 10 wt% in solution ([Fe]/[Sn] = 0 -40 at% in solution). The th...
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Published in: | Solid state sciences 2009, Vol.11 (1), p.233-239 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | In this paper, we report structural, electrical, optical, and especially thermoelectrical characterization of iron (Fe) doped tin oxide films, which have been deposited by spray pyrolysis technique. The doping level has changed from 0 to 10 wt% in solution ([Fe]/[Sn] = 0 -40 at% in solution). The thermoelectric response versus temperature difference has exhibited a nonlinear behavior, and the Seebeck coefficient has been calculated from its slope in temperature range of 300 -500 K. The Hall effect and thermoelectric measurements have shown p-type conductivity in SnO2:Fe films with [Fe]/[Sn] > = 7.8 at%. In doping levels lower than 7.8 at%, SnO2:Fe films have been n-type with a negative thermoelectric coefficient. The Seebeck coefficient for SnO2:Fe films with 7.8 at% doping level has been obtained to be as high as +1850 muV/K. The analysis of as-deposited samples with thicknesses 350 nm by X-ray diffraction (XRD) and scanning electron microscopy (SEM) has shown polycrystalline structure with clear characteristic peak of SnO2 cassiterite phase in all films. The optical transparency (T%) of SnO2:Fe films in visible spectra decreases from 90% to 75% and electrical resistivity (rho) increases from 1.2 X 10-2 to 3 X 103 Omega cm for Fe-doping in the range 0 -40 at%. |
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ISSN: | 1293-2558 1873-3085 |
DOI: | 10.1016/j.solidstatesciences.2008.05.005 |