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

被引：32
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
收藏
页码：396 / 400
页数：5
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