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Enhanced Phonon Scattering in Oxide Superlattices to Improve Laser Induced Thermoelectric Voltages

Published online by Cambridge University Press:  01 February 2011

Hanns-Ulrich Habermeier ,
Peng Xiang Zhang  and
Hui Zhang
Hanns-Ulrich Habermeier
Affiliation:
huh@fkf.mpg.de, Max-Planck-Institute FKF, Technology, Heisenbergstr 1, Stuttgart, D 70569, Germany
Peng Xiang Zhang
Affiliation:
p.zhang@fkf.mpg.de, Kunming University of Science and Technology, IAMPE, Kunming, N/A, China, People's Republic of
Hui Zhang
Affiliation:
zhang@public.km.yn.cn, Kunming University of Science and Technology, IAMPE, Kunming, N/A, China, People's Republic of
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Abstract

Optimizing the figure of merit for thermoelectric applications, ZT = S2σ2T/κ is currently at the core of materials oriented research in thermoelectricity. Here, one promising approach is to reduce ther thermal conductivity without sacrificing the electrical conductivity. Constructing superlattices of structurally compatible materials is one way to accomplish this goal. We report an enhanced laser induced thermoelectric voltage (LITV) effect observed in (YBa2Cu3O7/La1-xPbxMnO3)n multilayer thin films for the first time. Two groups of multilayer thin films grown on vicinal cut LaAlO3 substrates were prepared by pulsed laser deposition technique. The first group were grown on different substrates vicinal cut at different angles, and were used for checking the mechanism of the induced voltages. The second group samples were made at different period number n and for studying the number dependence of the peak values of LITV. The substrate angle dependence proved that this is a thermoelectric effect [1]. It was found that the LITV signals were enhanced significantly for these multilayer thin films comparing with the single layer ones. It is natural that the conductivity is going to be anisotropic due to the layered structure, and the same holds for the Seebeck coefficients. The enlarged Seebeck anisotropy will lead to higher induced voltages. Another possible reason is the reduced thermal conductivity in the layered structure. The maximum enhancement of LITV signals takes place at period number of 7, which seems in agreement with the prediction of minimum thermal conductivity in superlattices by Simkin and Mahan.

Keywords

thin filmthermoelectricityelectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1053: Symposium EE – Phonon Engineering–Theory and Applications , 2007 , 1053-EE01-05
Copyright
Copyright © Materials Research Society 2008

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References

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