Unusual n-type thermoelectric properties of Bi2Te3 doped with divalent alkali earth metals

被引：34

作者：

Byun, Sejin ^{[1
,2
,3
]}

Cha, Joonil ^{[1
,2
,3
]}

Zhou, Chongjian ^{[2
,3
]}

Lee, Yong Kyu ^{[1
,2
,3
]}

Lee, Hyungseok ^{[1
,2
,3
]}

Park, Sang Hyun ^{[5
]}

Lee, Won Bo ^{[2
,3
]}

Chung, In ^{[1
,2
,3
,4
]}

机构：

[1] Inst for Basic Sci Korea, Ctr Nanoparticle Res, Seoul 08826, South Korea

[2] Sch Chem & Biol Engn, Seoul 08826, South Korea

[3] Seoul Natl Univ, Seoul 08826, South Korea

[4] Seoul Natl Univ, Inst Engn Res, Seoul 08826, South Korea

[5] Korea Inst Energy Res, Adv Mat & Devices Lab, Daejeon 34129, South Korea

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2019年 / 269卷

基金：

新加坡国家研究基金会;

关键词：

Thermoelectric; Bismuth telluride; Alkaline earth metal doping; n-type conduction; Waste heat; THERMAL TRANSPORT; FIGURE; RESISTIVITY; MERIT;

D O I：

10.1016/j.jssc.2018.10.012

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Bi2Te3-based materials are a representative thermoelectric system operating near ambient temperature. Their n-type family is very limited and underperforms the p-type counterpart, which is a major concern in the thermoelectric community. Here we report that alkali earth metals (AE = Mg, Ca, Sr, Ba) in Group 2 unusually induce n-type thermoelectric properties in Bi2Te3. Mg is the most efficient electron donor among them. The x = 0.01 sample of MgxBi2-xTe3 (x = 0.005, 0.01, 0.015) system exhibits remarkably enhanced power factor and ZT of similar to 0.8 at 350 K in comparison with pristine Bi2Te3. The improved performance is attributed to simultaneously enhanced electrical conductivity and reduced lattice thermal conductivity. Remarkably, MgxBi2-xTe3 materials show larger Seebeck coefficients than those expected by the theoretical Pisarenko relation.

引用

页码：396 / 400

页数：5

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