Non-equilibrium processing leads to record high thermoelectric figure of merit in PbTe-SrTe

Gangjian Tan, Fengyuan Shi, Shiqiang Hao, Li Dong Zhao, Hang Chi, Xiaomi Zhang, Ctirad Uher, Chris Wolverton, Vinayak P. Dravid, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

141 Citations (Scopus)

Abstract

The broad-based implementation of thermoelectric materials in converting heat to electricity hinges on the achievement of high conversion efficiency. Here we demonstrate a thermoelectric figure of merit ZT of 2.5 at 923 K by the cumulative integration of several performance-enhancing concepts in a single material system. Using non-equilibrium processing we show that hole-doped samples of PbTe can be heavily alloyed with SrTe well beyond its thermodynamic solubility limit of -1 K-2. Exceeding the 5 mol% solubility limit leads to endotaxial SrTe nanostructures which produce extremely low lattice thermal conductivity of 0.5 W m-1 K-1 but preserve high hole mobilities because of the matrix/precipitate valence band alignment. The best composition is hole-doped PbTe-8%SrTe.

Original languageEnglish
Article number12167
JournalNature Communications
Volume7
DOIs
Publication statusPublished - Jul 26 2016

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figure of merit
Solubility
solubility
Thermal Conductivity
Electricity
Hole mobility
thermoelectric materials
Nanostructures
hinges
hole mobility
Hinges
Processing
Valence bands
electricity
Thermodynamics
Conversion efficiency
Precipitates
precipitates
Thermal conductivity
thermal conductivity

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Non-equilibrium processing leads to record high thermoelectric figure of merit in PbTe-SrTe. / Tan, Gangjian; Shi, Fengyuan; Hao, Shiqiang; Zhao, Li Dong; Chi, Hang; Zhang, Xiaomi; Uher, Ctirad; Wolverton, Chris; Dravid, Vinayak P.; Kanatzidis, Mercouri G.

In: Nature Communications, Vol. 7, 12167, 26.07.2016.

Research output: Contribution to journalArticle

Tan, G, Shi, F, Hao, S, Zhao, LD, Chi, H, Zhang, X, Uher, C, Wolverton, C, Dravid, VP & Kanatzidis, MG 2016, 'Non-equilibrium processing leads to record high thermoelectric figure of merit in PbTe-SrTe', Nature Communications, vol. 7, 12167. https://doi.org/10.1038/ncomms12167
Tan, Gangjian ; Shi, Fengyuan ; Hao, Shiqiang ; Zhao, Li Dong ; Chi, Hang ; Zhang, Xiaomi ; Uher, Ctirad ; Wolverton, Chris ; Dravid, Vinayak P. ; Kanatzidis, Mercouri G. / Non-equilibrium processing leads to record high thermoelectric figure of merit in PbTe-SrTe. In: Nature Communications. 2016 ; Vol. 7.
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AU - Zhang, Xiaomi

AU - Uher, Ctirad

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