Discovery of high-performance low-cost n-type Mg3Sb2-based thermoelectric materials with multi-valley conduction bands

被引：541

作者：

Zhang, Jiawei ^{[1
,2
]}

Song, Lirong ^{[1
,2
]}

Pedersen, Steffen Hindborg ^{[1
,2
]}

Yin, Hao ^{[1
,2
,3
]}

Le Thanh Hung ^{[4
]}

Iversen, Bo Brummerstedt ^{[1
,2
]}

机构：

[1] Aarhus Univ, Dept Chem, Ctr Mat Crystallog, DK-8000 Aarhus, Denmark

[2] Aarhus Univ, INANO, DK-8000 Aarhus, Denmark

[3] TEGnology ApS, Lundagervej 102, DK-8722 Hedensted, Denmark

[4] Tech Univ Denmark, Dept Energy Convers & Storage, 399 Frederiksborgvej, DK-4000 Roskilde, Denmark

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

基金：

新加坡国家研究基金会;

关键词：

ZINTL COMPOUND;

D O I：

10.1038/ncomms13901

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Widespread application of thermoelectric devices for waste heat recovery requires low-cost high-performance materials. The currently available n-type thermoelectric materials are limited either by their low efficiencies or by being based on expensive, scarce or toxic elements. Here we report a low-cost n-type material, Te-doped Mg3Sb1.5Bi0.5, that exhibits a very high figure of merit zT ranging from 0.56 to 1.65 at 300 - 725 K. Using combined theoretical prediction and experimental validation, we show that the high thermoelectric performance originates from the significantly enhanced power factor because of the multivalley band behaviour dominated by a unique near-edge conduction band with a sixfold valley degeneracy. This makes Te-doped Mg3Sb1.5Bi0.5 a promising candidate for the low-and intermediate-temperature thermoelectric applications.

引用

页数：8

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