Improvement of thermoelectric performance by optimizing chemical composition in single crystalline Ba8CuxSi46-x clathrate

Zilong Zhang; Yuko Matsukawa; Masahide Yasuda; Chiho Inoue; Yusuke Kimura; Shigeto Yamasaki; Makoto Arita; Shinji Munetoh

doi:10.14957/fgms.35.8

Original paper

Improvement of thermoelectric performance by optimizing chemical composition in single crystalline Ba₈Cu_xSi_46-_x clathrate

Zilong Zhang, Yuko Matsukawa, Masahide Yasuda, Chiho Inoue, Yusuke Kimura, Shigeto Yamasaki, Makoto Arita, Shinji Munetoh

Author information

Zilong Zhang
Department of Materials Science and Engineering, Kyushu University [Japan]
Yuko Matsukawa
Department of Materials Science and Engineering, Kyushu University [Japan]
Masahide Yasuda
Department of Materials Science and Engineering, Kyushu University [Japan]
Chiho Inoue
Department of Materials Science and Engineering, Kyushu University [Japan]
Yusuke Kimura
Department of Materials Science and Engineering, Kyushu University [Japan]
Shigeto Yamasaki
Department of Materials Science and Engineering, Kyushu University [Japan]
Makoto Arita
Department of Materials Science and Engineering, Kyushu University [Japan]
Shinji Munetoh [Japan] Corresponding author
Department of Materials Science and Engineering, Kyushu University [Japan]

Keywords: Thermoelectric material, Ba8CuxSi46-x clathrate, power factor, single crystal, Czochralski method

JOURNAL FREE ACCESS

2021 Volume 35 Pages 8-12

DOI https://doi.org/10.14957/fgms.35.8

Details

Abstract

A series of single crystalline Ba₈Cu_xSi_46-_x clathrate semiconductors with different Cu contents were successfully fabricated via Czochralski (CZ) method. The actual Cu content can increase with nominal Cu ratio, resulting in the higher values of Seebeck coefficient and electrical resistivity. Among the series, Ba_7.89Cu_4.66Si_41.34 sample shows a relatively high power factor of 0.688 mW/K² m at 500 °C. These results support that control of the Cu content leads to improvement of the power factor in Ba₈Cu_xSi_46-_x clathrate thermoelectric materials.

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