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Thermoelectric properties of Ca3Co4O9 and Ca2.8Bi0.2Co4O9 thin films in their island formation mode

Published online by Cambridge University Press:  17 June 2013

Priyanka Jood ,
Germanas Peleckis ,
Xiaolin Wang  and
Shi Xue Dou
Priyanka Jood*
Affiliation:
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2519, Australia
Germanas Peleckis
Affiliation:
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2519, Australia
Xiaolin Wang
Affiliation:
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2519, Australia
Shi Xue Dou
Affiliation:
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, New South Wales 2519, Australia
*
a)Address all correspondence to this author. e-mail: [email protected], [email protected]
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Abstract

Ca3Co4O9 and Ca2.8Bi0.2Co4O9 thin films were fabricated on LaAlO3 (LAO) substrate using pulsed laser deposition technique and were studied for their thermoelectric (TE) properties in Stranski–Krastanov mode for the first time. The thin films consisted of 3D clusters/islands on a ∼14-nm thick 2D layer with cluster density being higher for Ca2.8Bi0.2Co4O9 thin films. The clusters also represent areas of dislocation and therefore act as carrier scattering centers, which leads to a temperature-activated type conductivity. Seebeck coefficient as high as 136 and 163 μ V/K was measured for the Ca3Co4O9 and Ca2.8Bi0.2Co4O9 thin films, respectively, which is among the highest reported values for this system. The 3D island formation was also found to be useful in reducing the thermal conductivity of the thin film/substrate system by increased phonon scattering. This work shows that the island formation in thin films can be utilized as a means of enhancing TE properties of a thin film system, however, a detailed work including optimization of the film thickness and cluster/inland density is required.

Keywords

thermoelectric materialsoxidesthin filmspulsed laser deposition
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 14 , 28 July 2013 , pp. 1932 - 1939
Copyright
Copyright © Materials Research Society 2013 

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References

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