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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

171 Scopus citations

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 (US)
Pages (from-to)2366-2373
Number of pages8
JournalJournal of the American Chemical Society
Volume138
Issue number7
DOIs
StatePublished - Mar 2 2016

ASJC Scopus subject areas

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

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