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High thermoelectric efficiency in co-doped degenerate p-type PbTe

Published online by Cambridge University Press:  01 February 2011

Ioannis Androulakis ,
Ilyia Todorov ,
Duck Young Chung ,
Sedat Ballikaya ,
Guoyu Wang ,
Ctirad Uher  and
Mercouri Kanatzidis
Ioannis Androulakis
Affiliation:
i-androulakis@northwestern.edu, Northwestern University, Evanston, United States
Ilyia Todorov
Affiliation:
istodorov@yahoo.com, Argonne National Laboratory, Materials Science Division, Argonne, Illinois, United States
Duck Young Chung
Affiliation:
dychung@anl.gov, Argonne National Laboratory, Materials Science Division, Argonne, Illinois, United States
Sedat Ballikaya
Affiliation:
sballikaya@umich.edu, University of Michigan, Ann Arbor, United States
Guoyu Wang
Affiliation:
gywang@umich.edu, University of Michigan, Ann Arbor, United States
Ctirad Uher
Affiliation:
cuher@umich.edu, University of Michigan, Ann Arbor, United States
Mercouri Kanatzidis
Affiliation:
m-kanatzidis@northwester.edu, Northwestern University, Evanston, United States
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Abstract

We explored the effect of K and K-Na substitution for Pb atoms in the lattice of PbTe, in an effort to test a hypothesis for the development of a resonant state that may enhance the thermoelectric power. At 300K the data can adequately be explained by a combination of a single and two-band model for the valence band of PbTe depending on hole density that varies in the range 1-15 × 1019 cm-3. A change in scattering mechanism was observed in the temperature dependence of the electrical conductivity, σ, for samples concurrently doped with K and Na which results in significantly enhanced σ at elevated temperatures and hence power factors. Thermal conductivity data provide evidence of a strong interaction between the light- and the heavy-hole valence bands at least up to 500K. Figure of merits as high as 1.3 at 700K were measured as a result of the enhanced power factors.

Keywords

electrical propertiesthermal conductivitythermoelectricity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1267: Symposium DD – Thermoelectric Materials 2010-Growth, Properties, Novel Characterization Methods and Applications , 2010 , 1267-DD04-03
Copyright
Copyright © Materials Research Society 2010

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