Solid-state thermoelectric cooling is expected to be widely used in various cryogenic applications such as local cooling of superconducting devices. At present, however, thermoelectric cooling using p- and n-type Bi2Te3-based materials has been put to practical use only at room temperature. Recently, M4SiTe4 (M = Ta, Nb) has been found to show excellent n-type thermoelectric properties down to 50 K. This paper reports on the synthesis of high-performance p-type M4SiTe4 by Ti doping, which can be combined with n-type M4SiTe4 in a cooling device at low temperatures. The thermoelectric power factor of p-type M4SiTe4 reaches a maximum value of approximately 60 μW cm−1 K−2 at 210 K and exceeds the practical level in a wide temperature range of 130–270 K. A finite temperature drop by Peltier cooling was also achieved in a cooling device made of p- and n-type Ta4SiTe4 whisker crystals. These results clearly indicate that M4SiTe4 is promising to realize a practical thermoelectric cooler for use at low temperatures, which is not covered by Bi2Te3-based materials.
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22 July 2019
Research Article|
July 24 2019
Hole-doped M4SiTe4 (M = Ta, Nb) as an efficient p-type thermoelectric material for low-temperature applications
Yoshihiko Okamoto;
Yoshihiko Okamoto
a)
Department of Applied Physics, Nagoya University
, Nagoya 464-8603, Japan
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Yuma Yoshikawa;
Yuma Yoshikawa
Department of Applied Physics, Nagoya University
, Nagoya 464-8603, Japan
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Taichi Wada
;
Taichi Wada
Department of Applied Physics, Nagoya University
, Nagoya 464-8603, Japan
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Koshi Takenaka
Koshi Takenaka
Department of Applied Physics, Nagoya University
, Nagoya 464-8603, Japan
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a)
Electronic mail: yokamoto@nuap.nagoya-u.ac.jp
Appl. Phys. Lett. 115, 043901 (2019)
Article history
Received:
May 10 2019
Accepted:
June 30 2019
Citation
Yoshihiko Okamoto, Yuma Yoshikawa, Taichi Wada, Koshi Takenaka; Hole-doped M4SiTe4 (M = Ta, Nb) as an efficient p-type thermoelectric material for low-temperature applications. Appl. Phys. Lett. 22 July 2019; 115 (4): 043901. https://doi.org/10.1063/1.5109590
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