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

210 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

ASJC Scopus subject areas

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

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    Tan, G., Shi, F., Hao, S., Zhao, L. D., Chi, H., Zhang, X., Uher, C., Wolverton, C., Dravid, V. P., & Kanatzidis, M. G. (2016). Non-equilibrium processing leads to record high thermoelectric figure of merit in PbTe-SrTe. Nature Communications, 7, [12167]. https://doi.org/10.1038/ncomms12167