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The Effect on Thermoelectric Properties of Cd Substitution in PbTe

Published online by Cambridge University Press:  31 January 2011

Kyunghan Ahn ,
Mi-Kyung Han ,
Derek Vermeulen ,
Steven Moses ,
Ctirad Uher  and
Mercouri Kanatzidis
Kyunghan Ahn
Affiliation:
k-ahn@northwestern.edu, Northwestern University, Chemistry, Evanston, Illinois, United States
Mi-Kyung Han
Affiliation:
mikihan@snu.ac.kr, Northwestern University, Chemistry, Evanston, Illinois, United States
Derek Vermeulen
Affiliation:
dv@phys.ksu.edu, University of Michigan, Physics, Ann Arbor, Michigan, United States
Steven Moses
Affiliation:
smoses@umich.edu, University of Michigan, Physics, Ann Arbor, Michigan, United States
Ctirad Uher
Affiliation:
cuher@umich.edu, University of Michigan, Physics, Ann Arbor, Michigan, United States
Mercouri Kanatzidis
Affiliation:
m-kanatzidis@northwestern.edu, Northwestern University, Chemistry, Evanston, Illinois, United States
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Abstract

A recent theoretical study suggested that the substitution of Cd in PbTe can result in a distortion in the electronic density of states (DOS) near the bottom of the conduction band in PbTe. In this study we explored the effect of Cd doping on the thermoelectric properties of PbTe in an effort to test the theoretical prediction that DOS distortion can increase the Seebeck coefficient. We present detailed investigation of structural and spectroscopic data, transmission electron microscopy, as well as transport properties of samples of PbI2 doped PbTe-x% CdTe (x = 1, 3, 5, 7, 10). All samples follow the Pisarenko relationship and no enhancement of the Seebeck coefficient was observed due to DOS distortions. A low lattice thermal conductivity was achieved by nanostructuring observed via high resolution transmission electron microscopy. A maximum ZT of ˜1.2 at ˜720 K was achieved for the 1% CdTe sample.

Keywords

thermoelectricnanostructureCd
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1166: Symposium N – Materials and Devices for Thermal-to-Electric Energy Conversion , 2009 , 1166-N06-09
Copyright
Copyright © Materials Research Society 2009

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