Realizing high performance n-type PbTe by synergistically optimizing effective mass and carrier mobility and suppressing bipolar thermal conductivity

Xiao, Yu1; Wu, Haijun2; Cui, Juan3,4; Wang, Dongyang1; Fu, Liangwei3; Zhang, Yang2; Chen, Yue4; He, Jiaqing3; Pennycook, Stephen J.2; Zhao, Li-Dong1

2018-09

10.1039/c8ee01151f

Energy & Environmental Science   影响因子和分区

1754-5692

1754-5706

Thermoelectric materials enable direct inter-conversion between electrical energy and thermal energy. The conversion efficiency is limited by their complex interdependent thermoelectric parameters. Here, we report that the electrical and thermal transport properties of n-type PbTe can be simultaneously improved by introducing just one component, MnTe. We obtained a maximum ZT of similar to 1.6 at 773 K and an average ZT(ave) of > 1.0 at 300-873 K in n-type MnTe alloyed PbTe. This remarkably enhanced performance arises from the triple functions of MnTe alloying: (1) making the conduction band flatter to increase the effective mass from 0.31 m(e) to 0.45 m(e); (2) enlarging the band gap of PbTe to suppress the bipolar thermal conductivity; and (3) introducing point defects instead of nanoprecipitates to reduce the lattice thermal conductivity while maintaining a relatively high carrier mobility. Our results indicate that high performance can be achieved in n-type PbTe by integrating different but synergistic concepts.

SCI ; EI

英语

其他

RGC[27202516] ; RGC[17200017]

Chemistry ; Energy & Fuels ; Engineering ; Environmental Sciences & Ecology

Chemistry, Multidisciplinary ; Energy & Fuels ; Engineering, Chemical ; Environmental Sciences

WOS:000445215400015

ROYAL SOC CHEMISTRY

20183905855159

Carrier mobility ; Energy gap ; IV-VI semiconductors ; Lead alloys ; Manganese alloys ; Point defects ; Precipitation (chemical) ; Thermoelectricity

Manganese and Alloys:543.2 ; Lead and Alloys:546.1 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Semiconducting Materials:712.1 ; Chemical Operations:802.3 ; Crystal Lattice:933.1.1

Web of Science

1.Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
2.Natl Univ Singapore, Dept Mat Sci & Engn, 7 Engn Dr 1, Singapore 117575, Singapore
3.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
4.Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China

Xiao, Yu,Wu, Haijun,Cui, Juan,et al. Realizing high performance n-type PbTe by synergistically optimizing effective mass and carrier mobility and suppressing bipolar thermal conductivity[J]. Energy & Environmental Science,2018,11(9):2486-2495.

Xiao, Yu.,Wu, Haijun.,Cui, Juan.,Wang, Dongyang.,Fu, Liangwei.,...&Zhao, Li-Dong.(2018).Realizing high performance n-type PbTe by synergistically optimizing effective mass and carrier mobility and suppressing bipolar thermal conductivity.Energy & Environmental Science,11(9),2486-2495.

Xiao, Yu,et al."Realizing high performance n-type PbTe by synergistically optimizing effective mass and carrier mobility and suppressing bipolar thermal conductivity".Energy & Environmental Science 11.9(2018):2486-2495.