Multi-localization transport behaviour in bulk thermoelectric materials

Wenyu Zhao, Ping Wei, Qingjie Zhang (), Hua Peng, Wanting Zhu, Dingguo Tang, Jian Yu, Hongyu Zhou, Zhiyuan Liu, Xin Mu, Danqi He, Jichao Li, Chunlei Wang, Xinfeng Tang and Jihui Yang ()
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Wenyu Zhao: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Ping Wei: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Qingjie Zhang: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Hua Peng: School of Physics, State key Laboratory of Crystal Materials, Shandong University
Wanting Zhu: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Dingguo Tang: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Jian Yu: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Hongyu Zhou: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Zhiyuan Liu: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Xin Mu: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Danqi He: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Jichao Li: School of Physics, State key Laboratory of Crystal Materials, Shandong University
Chunlei Wang: School of Physics, State key Laboratory of Crystal Materials, Shandong University
Xinfeng Tang: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology
Jihui Yang: University of Washington

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Simultaneously optimizing electrical and thermal transport properties of bulk thermoelectric materials remains a key challenge due to the conflicting combination of material traits. Here, we have explored the electrical and thermal transport features of In-filled CoSb3 through X-ray absorption fine structure, X-ray photoemission spectra, transport measurement and theoretical calculation. The results provide evidence of three types of coexisting multi-localization transport behaviours in the material; these are heat-carrying phonon-localized resonant scattering, accelerated electron movement and increase in density of states near the Fermi level. The 5p-orbital hybridization between In and Sb is discovered in the In-filled CoSb3 compound, which results in a charge transfer from Sb to In and the enhancement of p–d orbital hybridization between Co and Sb. Our work demonstrates that the electrical and thermal properties of filled skutterudite bulk thermoelectric materials can be simultaneously optimized through the three types of coexisting multi-localization transport behaviours in an independent way.

Date: 2015
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DOI: 10.1038/ncomms7197

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