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Electron and Phonon Transport in n- and p-type Skutterudites

Published online by Cambridge University Press:  22 February 2013

Jiong Yang
Affiliation:
Materials Science and Engineering Department, University of Washington, Seattle, WA 98195-2120, USA
S. Wang
Affiliation:
Materials Science and Engineering Department, University of Washington, Seattle, WA 98195-2120, USA
Jihui Yang*
Affiliation:
Materials Science and Engineering Department, University of Washington, Seattle, WA 98195-2120, USA
W. Zhang
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
L. Chen
Affiliation:
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
*
a)Author to whom correspondence should be addressed, Electronic mail: jihuiy@uw.edu
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Abstract

Filled skutterudites are one of the most promising materials for thermoelectric (TE) power generation applications at intermediate temperatures due to their superior TE and thermomechanical performance as compared to other materials. In the past, we have demonstrated that n-type skutterudites can be optimized so that their maximum TE figure of merit reaches 1.7 at 850 K. TE performance of the p-type, however, is lagging behind, which hinders the optimization of skutterudites-based TE module development. In this paper we reveal that the underlying reasons for inferior TE properties of the p-type root in their electronic band structures, which result in higher thermal conductivity at elevated temperatures due to bipolar lattice thermal conduction and lower power factor because of heavy valance bands induced strong electron-phonon interactions. We also identify means of improving the power factor and reducing bipolar effect.

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Articles
Copyright
Copyright © Materials Research Society 2013 

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