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Thermoelectric Properties of Nano-structure Controlled Sm2−xCexCuO4 Thin Films

Published online by Cambridge University Press:  01 February 2011

Yusuke Ichino ,
Koji Yamazaki ,
Tomoki Yoshikawa ,
Yutaka Yoshida  and
Yoshiaki Takai
Yusuke Ichino
Affiliation:
ichino@nuee.nagoya-u.ac.jp, Nagoya University, Dept. of Energy Engineering and Science, Furo-cho, Chikusa-ku, Nagoya, N/A, 464-8603, Japan, +81-52-789-3777, +81-52-789-3777
Koji Yamazaki
Affiliation:
k_yamaza@nuee.nagoya-u.ac.jp, Nagoya University, Dept. of Energy Engineering and Science, Furo-cho, Chikusa-ku, Nagoya, N/A, 464-8603, Japan
Tomoki Yoshikawa
Affiliation:
t-yoshikawa@ees.nagoya-u.ac.jp, Nagoya University, Dept. of Energy Engineering and Science, Furo-cho, Chikusa-ku, Nagoya, N/A, 464-8603, Japan
Yutaka Yoshida
Affiliation:
yoshida@nuee.nagoya-u.ac.jp, Nagoya University, Dept. of Energy Engineering and Science, Furo-cho, Chikusa-ku, Nagoya, N/A, 464-8603, Japan
Yoshiaki Takai
Affiliation:
takai@nuee.nagoya-u.ac.jp, Nagoya University, Dept. of Energy Engineering and Science, Furo-cho, Chikusa-ku, Nagoya, N/A, 464-8603, Japan
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Abstract

Sm2−xCexCuO4 (SCCO) is well known as an n-type superconductor with large physical anisotropies. In order to enhance the thermoelectric conversion performance, we have prepared the SCCO epitaxial films and controlled a crystallographic orientation, a carrier concentration and an introduction of nano-structures. The SCCO films and nano-structures consisting of CeO2 were fabricated using pulsed laser deposition method on SrTiO3 single crystalline substrates. Due to the orientation control and the optimization of carrier concentration, a low resistivity and a high Seebeck coefficient were achieved, and a power factor (PF) reached 1.14×10−3 W/mK2 at 323 K in the SCCO film with x × = 0.02. In addition, we measured the nano-structural effect on the PF of SCCO films. As a result, the PF showed a maximum in the film on a certain shape of the nano-structures. We speculate that the low resistivity was achieved by a formation of high Ce concentration layer near the interface between film and nano-structure.

Keywords

thermoelectricityfilmnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 928: Symposium GG – Current and Future Trends of Functional Oxide Films , 2006 , 0928-GG14-17
Copyright
Copyright © Materials Research Society 2006

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