Synergistically optimizing thermoelectric transport properties of n-type PbTe via Se and Sn co-alloying

Xiao, Yu1; Li, Wei2; Chang, Cheng1; Chen, Yuexing2; Huang, Li2; He, Jiaqing2; Zhao, Li-Dong1

2017-11-15

10.1016/j.jallcom.2017.06.296

JOURNAL OF ALLOYS AND COMPOUNDS   影响因子和分区

0925-8388

1873-4669

We report n-type PbTe with a maximum ZT similar to 1.2 at 673 K and an average ZT(ave) similar to 0.84 at 300-823 K, which was achieved through a Sn and Se co-alloying approach. We find that the lattice thermal conductivity can be largely reduced through introducing Se in Te sites, and the power factor can be enhanced through introducing Sn in the Pb sites. Combining two strategies via Se and Sn co-alloying in PbTe, results show that the lattice thermal conductivity at 300 K can be reduced from similar to 3.1 Wm(-1)K(-1) to similar to 1.2 Wm(-1)K(-1) after alloying 15% Se, which is consistent with the Callaway model. Meanwhile, we find that both carrier concentration and mobility can be enhanced through alloying small amount of Sn, which are supported by DFT calculation with emphasis on the defect formation energies. The improvement on electrical conductivity elucidates an enhanced power factor at 300 K increasing from similar to 6.4 mu Wcm(-1)K(-2) to similar to 14.6 mu Wcm(-1)K(-2). Through synergistically optimizing electrical and thermal transport properties of n-type PbTe via Sn and Se co-alloying, the ZT value is distinctly enhanced to 1.2 at 673 K, and the average ZT(ave) value is improved by similar to 35%, from similar to 0.62 in PbTe0.997I0.003 to similar to 0.84 in Pb0.995Sn0.005Te0.847Se0.15I0.003, ensuring a high maximum thermoelectric conversion efficiency similar to 10.7%. (C) 2017 Elsevier B.V. All rights reserved.

n-type PbTe Electrical conductivity Seebeck coefficient Thermal conductivity ZT(ave)

SCI ; EI

英语

通讯

Beijing Municipal Science & Technology Commission[Z171100002017002]

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000407848400026

ELSEVIER SCIENCE SA

20172803901102

Alloying ; Carrier concentration ; Crystal lattices ; Electric conductivity ; Electric power factor ; IV-VI semiconductors ; Seebeck coefficient ; Thermal conductivity ; Tin alloys

Metallurgy:531.1 ; Lead and Alloys:546.1 ; Tin and Alloys:546.2 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Crystal Lattice:933.1.1

MATERIALS SCIENCE

Web of Science

1.Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
2.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China

Xiao, Yu,Li, Wei,Chang, Cheng,et al. Synergistically optimizing thermoelectric transport properties of n-type PbTe via Se and Sn co-alloying[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2017,724:208-221.

Xiao, Yu.,Li, Wei.,Chang, Cheng.,Chen, Yuexing.,Huang, Li.,...&Zhao, Li-Dong.(2017).Synergistically optimizing thermoelectric transport properties of n-type PbTe via Se and Sn co-alloying.JOURNAL OF ALLOYS AND COMPOUNDS,724,208-221.

Xiao, Yu,et al."Synergistically optimizing thermoelectric transport properties of n-type PbTe via Se and Sn co-alloying".JOURNAL OF ALLOYS AND COMPOUNDS 724(2017):208-221.