Energy band and charge-carrier engineering in skutterudite thermoelectric materials

doi:10.1088/1674-1056/ac6ee8

Abstract The binary CoSb₃ skutterudite thermoelectric material has high thermal conductivity due to the covalent bond between Co and Sb, and the thermoelectric figure of merit, ZT, is very low. The thermal conductivity of CoSb₃ materials can be significantly reduced through phonon engineering, such as low-dimensional structure, the introduction of nano second phases, nanointerfaces or nanopores, which greatly improves their ZT values. The phonon engineering can optimize significantly the thermal transport properties of CoSb₃-based materials. However, the improvement of the electronic transport properties is not obvious, or even worse. Energy band and charge-carrier engineering can significantly improve the electronic transport properties of CoSb₃-based materials while optimizing the thermal transport properties. Therefore, the decoupling of thermal and electronic transport properties of CoSb₃-based materials can be realized by energy band and charge-carrier engineering. This review summarizes some methods of optimizing synergistically the electronic and thermal transport properties of CoSb₃ materials through the energy band and charge-carrier engineering strategies. Energy band engineering strategies include band convergence or resonant energy levels caused by doping/filling. The charge-carrier engineering strategy includes the optimization of carrier concentration and mobility caused by doping/filling, forming modulation doped structures or introducing nano second phase. These strategies are effective means to improve performance of thermoelectric materials and provide new research ideas of development of high-efficiency thermoelectric materials.

Keywords: CoSb₃-based skutterudite materials energy band engineering charge-carrier engineering thermoelectric properties

Received: 29 March 2022
Revised: 02 May 2022
Accepted manuscript online:

PACS:	73.50.Lw	(Thermoelectric effects)
	84.60.Rb	(Thermoelectric, electrogasdynamic and other direct energy conversion)
	74.25.F-	(Transport properties)
	74.25.fc	(Electric and thermal conductivity)

Fund: This review was supported by the National Natural Science Foundation of China (Grant No. 51872006) and the Excellent Youth Project of Natural Science Foundation of Anhui Province of China (Grant No. 2208085Y17).

Corresponding Authors: Zhiyuan Liu
E-mail: zhiyuanliu826@ahut.edu.cn

Cite this article:

Zhiyuan Liu(刘志愿), Ting Yang(杨婷), Yonggui Wang(王永贵), Ailin Xia(夏爱林), and Lianbo Ma(马连波) Energy band and charge-carrier engineering in skutterudite thermoelectric materials 2022 Chin. Phys. B 31 107303

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