Thermopower enhancement in Pb1-xMnxTe alloys and its effect on thermoelectric efficiency

被引：214

作者：

Pei, Yanzhong ^{[1
]}

Wang, Heng ^{[2
]}

Gibbs, Zachary M. ^{[2
]}

LaLonde, Aaron D. ^{[2
]}

Snyder, G. Jeffrey ^{[1
,2
]}

机构：

[1] Tongji Univ, Sch Mat Sci & Engn, Shanghai 201804, Peoples R China

[2] CALTECH, Dept Mat Sci, Pasadena, CA 91125 USA

来源：

NPG ASIA MATERIALS | 2012年 / 4卷

关键词：

band engineering; resonant states; thermoelectric; TRANSITION ELEMENT TI; 2ND VALENCE-BAND; OPTICAL-PROPERTIES; LEAD-TELLURIDE; THERMAL-CONDUCTIVITY; TRANSPORT-PROPERTIES; RESONANCE STATES; PBTE; PERFORMANCE; THALLIUM;

D O I：

10.1038/am.2012.52

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Seebeck coefficient of p-type PbTe can be enhanced at 300 K, either due to the addition of Tl-resonant states or by manipulation of the multiple valence bands by alloying with isovalent compounds, such as MgTe. PbTe alloyed with MnTe shows a similar thermopower enhancement that could be due to either mechanism. Here we investigate the characteristics that distinguish the resonant state mechanism from that due to multiple valence bands and their effect on the thermoelectric figure of merit, zT. Ultimately, we find that the transport properties of PbTe alloyed with MnTe can be explained by alloy scattering and multiple band model that result in a zT as high as 1.6 at 700 K, and additionally a similar to 30% enhancement of the average zT. NPG Asia Materials (2012) 4, e28; doi:10.1038/am.2012.52; published online 21 September 2012

引用

页码：e28 / e28

页数：6

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