孤对电子对碲热电传输性能的影响

doi:10.11896/j.issn.1005-023X.2018.21.007

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Abstract Tellurium is an excellent thermoelectric (TE) material, has very high Seebeck coefficient, mobility and extra low thermal conductivity. In this paper, polycrystalline samples of pure Te and Sb_xTe_1-_x were prepared using melt-alloying and hot-pressing techniques, and Te crystals were prepared by vertical Bridgman-Stockbarge method. Then thermoelectric properties of the obtained crystals were studied. The results show that Te has a high Seebeck coefficient and conductivity, and Sb doping effectively improves the thermoelectric properties of Te, the conductivity of Te crystals prepared by vertical Bridgman-Stockbarge method shows obvious anisotropy. These results are mainly attributed to degenerate band in valance band, step-like DOS distribution near Fermi level and large phonon scattering phase. This effect can be attributed to the lone-pair electrons in Te lattice, which enable these characters benefiting TE transport properties. This study illustrates the lone-pair electrons of Te are origins of these properties by decoupling σ, α and κ, which also offer a new character to look for good TE materials.

Key words： tellurium lone-pair electrons thermoelectric transmission antimony doping vertical Bridgman-Stockbarge method anisotropy

Published: 21 November 2018

CLC number:

TB34

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	Articles by authors
	LI Rong
	CHEN Shaoping
	FAN Wenhao
	CHEN Yanzuo
	XU Libin
	WANG Wenxian
	WU Yucheng

Cite this article:

LI Rong,CHEN Shaoping,FAN Wenhao, et al. Effect of Lone-pair Electron on Thermoelectric Transmission Performance of Tellurium[J]. Materials Reports, 2018, 32(21): 3726-3730.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.21.007 OR http://www.mater-rep.com/EN/Y2018/V32/I21/3726

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