High thermoelectric figure of merit ZT in PbTe and Bi2Te3-based superlattices by a reduction of the thermal conductivity

被引：85

作者：

Beyer, H

Nurnus, J

Böttner, H

Lambrecht, A

Wagner, E

Bauer, G

机构：

[1] Frainhofer Inst Phys Messtech, D-79110 Freiburg, Germany

[2] Johannes Kepler Univ Linz, Inst Halbleiterphys, A-4040 Linz, Austria

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2002年 / 13卷 / 2-4期

关键词：

thermoelectrics; superlattices; thermal conductivity; figure of merit;

D O I：

10.1016/S1386-9477(02)00246-1

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Experimental evidence is presented for an enhanced thermoelectric figure of merit ZT = sigmaS(2)T/lambda. (where sigma is the electrical conductivity, S the thermopower, T the temperature, and lambda is the thermal conductivity) by a reduction of the thermal conductivity lambda in PbTe- and Bi2Te3-superlattices (SLs) parallel to the layer planes. Data on thermoelectric properties of Bi2Te3/Bi-2,(SexTe1-x)(3)-SLs. of PbTe-based doping SLs, and PbTe/PbSe0.2Te0.8-SLs are presented. In these structures. a decrease of lambda was measured compared to the corresponding bulk compounds or homogeneous alloys. Despite a drop of the total power factor sigmaS(2) in the SLs in total an enhancement of the figure of merit ZT is found in these highly-doped PbTe and Bi2Te3-based SLs. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：965 / 968

页数：4

共 20 条

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