Enhancing Thermoelectric Performance of n-Type Hot Deformed Bismuth-Telluride-Based Solid Solutions by Nonstoichiometry-Mediated Intrinsic Point Defects

Zhai, Renshuang1; Hu, Lipeng1; Wu, Haijun2,3,4; Xu, Zhaojun1; Zhu, Tie Jun1; Zhao, Xin-Bing1

2017-08-30

10.1021/acsami.7b08537

ACS Applied Materials & Interfaces   影响因子和分区

1944-8244

1944-8252

Bismuth-telluride-based solid solutions are the unique thermoelectric (TE) materials near room temperature. Various approaches have been applied to enhance the thermoelectric performance, and much progress has been made in their p-type materials. However, for the n-type counterparts, little breakthrough has been obtained. We herein report on, enhancing thermoelectric performance of n-type bismuth-telluride-based alloys by nonstoichiometry to mediate the point defects, combined with one-time hot deformation. The improved power factor of 3.3 X 10(-3) W m(-1) K-2 and reduced lattice thermal conductivity contribute to a high figure-of merit, zT, of 1.2 at 450 K for n-type Bi2Te2.3Se0.69 alloys with Se deficiency. The high zT is comparable to that of Bi2Te2.3Se0.7 hot deformed three times, which is a practically complicated process. The results demonstrate that nonstoichiometry can be an effective and simple strategy in mediating intrinsic point defects and enhancing the thermoelectric performance of bismuth-telluride-based alloys.

thermoelectric materials nonstoichiometry bismuth telluride hot deformation point defect Se deficiency

SCI ; EI

英语

其他

Natural Science Foundation of China[61534001] ; Natural Science Foundation of China[11574267] ; Natural Science Foundation of China[51571177]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000409395500048

AMER CHEMICAL SOC

20173604122987

Bismuth alloys ; Deformation ; Hot working ; Point defects ; Single crystals ; Solid solutions ; Thermal conductivity ; Thermoelectricity

Metal Forming:535.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Solid State Physics:933

Web of Science

1.Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China
2.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China
3.South Univ Sci & Technol China, Shenzhen Key Lab Thermoelect Mat, Shenzhen 518055, Peoples R China
4.Natl Univ Singapore, Dept Mat Sci & Engn, 7 Engn Dr 1, Singapore 117575, Singapore

Zhai, Renshuang,Hu, Lipeng,Wu, Haijun,et al. Enhancing Thermoelectric Performance of n-Type Hot Deformed Bismuth-Telluride-Based Solid Solutions by Nonstoichiometry-Mediated Intrinsic Point Defects[J]. ACS Applied Materials & Interfaces,2017,9(34):28577-28585.

Zhai, Renshuang,Hu, Lipeng,Wu, Haijun,Xu, Zhaojun,Zhu, Tie Jun,&Zhao, Xin-Bing.(2017).Enhancing Thermoelectric Performance of n-Type Hot Deformed Bismuth-Telluride-Based Solid Solutions by Nonstoichiometry-Mediated Intrinsic Point Defects.ACS Applied Materials & Interfaces,9(34),28577-28585.

Zhai, Renshuang,et al."Enhancing Thermoelectric Performance of n-Type Hot Deformed Bismuth-Telluride-Based Solid Solutions by Nonstoichiometry-Mediated Intrinsic Point Defects".ACS Applied Materials & Interfaces 9.34(2017):28577-28585.