We report the discovery of a very large thermoelectric power over –400 μV K−1 in the whisker crystals of a one-dimensional telluride Ta4SiTe4, while maintaining a low electrical resistivity of ρ = 2 mΩ cm, yielding a very large power factor of P = 80 μW cm−1 K−2 at an optimum temperature of 130 K. This temperature is widely controlled from the cryogenic temperature of 50 K to room temperature by chemical doping, resulting in the largest P of 170 μW cm−1 K−2 at 220–280 K. These P values far exceed those of the Bi2Te3-Sb2Te3 alloys at around room temperature, offering an avenue for realizing the practical-level thermoelectric cooling at low temperatures. The coexistence of a one-dimensional electronic structure and a very small band gap appearing in the vicinity of the Dirac semimetals probably causes the very large power factors in Ta4SiTe4, indicating that the “one-dimensional Dirac semimetal” is a promising way to find high-performance thermoelectric materials for the low temperature applications.
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1 May 2017
Research Article|
May 01 2017
Large thermoelectric power factor at low temperatures in one-dimensional telluride Ta4SiTe4
Takumi Inohara;
Takumi Inohara
1Department of Applied Physics,
Nagoya University
, Nagoya 464-8603, Japan
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Yoshihiko Okamoto;
Yoshihiko Okamoto
a)
1Department of Applied Physics,
Nagoya University
, Nagoya 464-8603, Japan
2Institute for Advanced Research,
Nagoya University
, Nagoya 464-8601, Japan
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Youichi Yamakawa;
Youichi Yamakawa
2Institute for Advanced Research,
Nagoya University
, Nagoya 464-8601, Japan
3Department of Physics,
Nagoya University
, Nagoya 464-8602, Japan
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Ai Yamakage;
Ai Yamakage
1Department of Applied Physics,
Nagoya University
, Nagoya 464-8603, Japan
2Institute for Advanced Research,
Nagoya University
, Nagoya 464-8601, Japan
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Koshi Takenaka
Koshi Takenaka
1Department 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. 110, 183901 (2017)
Article history
Received:
March 13 2017
Accepted:
April 09 2017
Citation
Takumi Inohara, Yoshihiko Okamoto, Youichi Yamakawa, Ai Yamakage, Koshi Takenaka; Large thermoelectric power factor at low temperatures in one-dimensional telluride Ta4SiTe4. Appl. Phys. Lett. 1 May 2017; 110 (18): 183901. https://doi.org/10.1063/1.4982623
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