Enhanced Thermoelectric Properties in the Counter-Doped SnTe System with Strained Endotaxial SrTe

Li Dong Zhao, Xiao Zhang, Haijun Wu, Gangjian Tan, Yanling Pei, Yu Xiao, Cheng Chang, Di Wu, Hang Chi, Lei Zheng, Shengkai Gong, Ctirad Uher, Jiaqing He, Mercouri G. Kanatzidis

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158 Citations (Scopus)

Abstract

We report enhanced thermoelectric performance in SnTe, where significantly improved electrical transport properties and reduced thermal conductivity were achieved simultaneously. The former was obtained from a larger hole Seebeck coefficient through Fermi level tuning by optimizing the carrier concentration with Ga, In, Bi, and Sb dopants, resulting in a power factor of 21 μW cm-1 K-2 and ZT of 0.9 at 823 K in Sn0.97Bi0.03Te. To reduce the lattice thermal conductivity without deteriorating the hole carrier mobility in Sn0.97Bi0.03Te, SrTe was chosen as the second phase to create strained endotaxial nanostructures as phonon scattering centers. As a result, the lattice thermal conductivity decreases strongly from ∼2.0 Wm-1 K-1 for Sn0.97Bi0.03Te to ∼1.2 Wm-1 K-1 as the SrTe content is increased from 0 to 5.0% at room temperature and from ∼1.1 to ∼0.70 Wm-1 K-1 at 823 K. For the Sn0.97Bi0.03Te-3% SrTe sample, this leads to a ZT of 1.2 at 823 K and a high average ZT (for SnTe) of 0.7 in the temperature range of 300-823 K, suggesting that SnTe is a robust candidate for medium-temperature thermoelectric applications.

Original languageEnglish
Pages (from-to)2366-2373
Number of pages8
JournalJournal of the American Chemical Society
Volume138
Issue number7
DOIs
Publication statusPublished - Mar 2 2016

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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  • Cite this

    Zhao, L. D., Zhang, X., Wu, H., Tan, G., Pei, Y., Xiao, Y., Chang, C., Wu, D., Chi, H., Zheng, L., Gong, S., Uher, C., He, J., & Kanatzidis, M. G. (2016). Enhanced Thermoelectric Properties in the Counter-Doped SnTe System with Strained Endotaxial SrTe. Journal of the American Chemical Society, 138(7), 2366-2373. https://doi.org/10.1021/jacs.5b13276