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Design and evaluation of n-type Si1-xGex as a thermoelectric-conversion material

Published online by Cambridge University Press:  01 February 2011

Tomohiro Imai
Affiliation:
T.Imai@sep.rikadai.jp, Tokyo University of Science, Department of Physics, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
Tsutomu Iida
Affiliation:
T.Imai@sep.rikadai.jp, Tokyo University of Science, Department of Materials Science and Technology, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
Yuki Miyata
Affiliation:
T.Imai@sep.rikadai.jp, Tokyo University of Science, Department of Materials Science and Technology, 2641 Yamazaki, Noda -shi, Chiba, 278-8510, Japan
Takashi Itoh
Affiliation:
T.Imai@sep.rikadai.jp, Tokyo University of Science, Department of Materials Science and Technology, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
Hiroki Funashima
Affiliation:
T.Imai@sep.rikadai.jp, Tokyo University of Science, Department of Physics, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
Yoshifumi Takanashi
Affiliation:
T.Imai@sep.rikadai.jp, Tokyo University of Science, Department of Materials Science and Technology, 2641 Yamazaki, Noda -shi, Chiba, 278-8510, Japan
Noriaki Hamada
Affiliation:
hamada@ph.noda.tus.ac.jp, Tokyo University of Science, Department of Physics, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
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Abstract

Si1-xGex alloys show the high power generating efficiency as a thermoelectric- conversion material. We evaluate the thermoelectric power of the n-type SiGe system on the basis of the first principles calculations. The electronic-band-structure calculation is performed using all-electron full-potential linearized augmented-plane-wave (FLAPW) method within the local density approximation (LDA). The Seebeck coefficient is analyzed by the Bloch-Boltzmann equation. We find that the ordered rhombohedral SiGe has high Seebeck coefficient in comparison with zincblende SiGe. The efficiency of the thermoelectric power in Si1-xGex is gained by the local atomic configuration rather than the Ge concentration.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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