Issue 8, 2021

Anomalous enhancement of thermoelectric power factor by thermal management with resonant level effect

Abstract

Obtaining high thermoelectric performance has been the biggest historical challenge for thermoelectric power generation. Here, we propose a methodology for thermoelectric power factor enhancement: thermal management with resonant level effect for simultaneous increase of electrical conductivity σ and Seebeck coefficient S. Au crystals and Au impurities are introduced into SiGe. Therein, (1) highly-conductive Au crystals increased σ. (2) Au impurities brought about resonant level effect and phonon scattering, resulting in enhanced S and lowered thermal conductivity κ of SiGe. (3) This κ distribution control brings the focus of temperature difference on SiGe parts with lowered κ, resulting in the availability of the enhanced S of SiGe parts as effective S of the entire nanocomposite. Consequently, we achieved the highest S2σ at room temperature among SiGe-related materials ever reported. Electronic structure calculation and measurement support the existence of resonant levels, which enhances S and lowers κ. These results provide a new route to thermoelectric performance enhancement.

Graphical abstract: Anomalous enhancement of thermoelectric power factor by thermal management with resonant level effect

Supplementary files

Article information

Article type
Paper
Submitted
03 Sep 2020
Accepted
30 Dec 2020
First published
28 Jan 2021

J. Mater. Chem. A, 2021,9, 4851-4857

Anomalous enhancement of thermoelectric power factor by thermal management with resonant level effect

S. Sakane, T. Ishibe, K. Mizuta, T. Fujita, Y. Kiyofuji, J. Ohe, E. Kobayashi and Y. Nakamura, J. Mater. Chem. A, 2021, 9, 4851 DOI: 10.1039/D0TA08683E

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