Realizing high thermoelectric performance in N-type Bi2Te3 compounds by Sb nano-precipitates

Sun, Jiepu1,2; Shu, Zhong1,2; Yang, Jianmin1,2; Wang, Tiancheng1,2; Zhu, Bin1,2; He, Jiaqing1,2,3

2021-10-07

10.1063/5.0066932

JOURNAL OF APPLIED PHYSICS   影响因子和分区

0021-8979

1089-7550

Driven by the prospective application of thermoelectric (TE) materials, massive efforts have been devoted to improving its performance. However, strong-coupled thermal and electrical transport is still the largest block for the promotion of TE techniques. Here, we report a peak ZT over 1.2 at 400 K in an n-type Bi2Te2.7Se0.3 sample doped by 5 wt. % Sb under the spark plasma sintering method. This high performance is attributed to the synergistically optimized thermal and electrical transport properties. Sb nano-precipitates, which have been observed directly by spherical aberration-corrected transmission electron microscopy, substantially decrease the lattice thermal conductivity of the sample, leading to a low value of 0.35 W m(-1 )K(-1). Meanwhile, band bending caused by the nano-precipitates significantly enhances the Seebeck coefficient, resulting in a high PF of 35 mu W cm(-1) K-2. The study about optimizing electrical and thermal properties simultaneously opens the door to the high performance of Bi2Te3-based materials.

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China (NNSFC)[11934007,11874194,51632005] ; leading talents of the Guangdong Province Program[00201517] ; Science, Technology and Innovation Committee Foundation of Shenzhen["KQTD2016022619565991","JCYJ20200109141205978"] ; Guangdong-Hong Kong-Macao Joint Laboratory[2019B121205001]

Physics

Physics, Applied

WOS:000703358200001

AIP Publishing

20214211031777

Aberrations ; Antimony ; Antimony compounds ; Bismuth compounds ; High resolution transmission electron microscopy ; Selenium ; Selenium compounds ; Spark plasma sintering ; Tellurium compounds ; Thermal conductivity

Antimony and Alloys:546.4 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Optical Devices and Systems:741.3

PHYSICS

Web of Science

1.Southern Univ Sci & Technol, Shenzhen Key Lab Thermoelect Mat, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Guangdong Hong Kong Macao Joint Lab Photon Therma, Shenzhen 518055, Peoples R China

Sun, Jiepu,Shu, Zhong,Yang, Jianmin,et al. Realizing high thermoelectric performance in N-type Bi2Te3 compounds by Sb nano-precipitates[J]. JOURNAL OF APPLIED PHYSICS,2021,130(13).

Sun, Jiepu,Shu, Zhong,Yang, Jianmin,Wang, Tiancheng,Zhu, Bin,&He, Jiaqing.(2021).Realizing high thermoelectric performance in N-type Bi2Te3 compounds by Sb nano-precipitates.JOURNAL OF APPLIED PHYSICS,130(13).

Sun, Jiepu,et al."Realizing high thermoelectric performance in N-type Bi2Te3 compounds by Sb nano-precipitates".JOURNAL OF APPLIED PHYSICS 130.13(2021).