Thermoelectric Performance of Single-Phase Tellurium-Reduced Quaternary (PbTe)(0.55)(PbS)(0.1)(PbSe)(0.35)

Laaya Shaabani, Graeme R. Blake, Andrew Manettas, Shokat Keshavarzi, Sima Aminorroaya Yamini*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Lead chalcogenide quaternary systems have been shown to provide high thermoelectric (TE) efficiency superior to those of binary and ternary lead chalcogenides, arising from both altered electronic band structures and a reduction in lattice thermal conductivity. Here, we have synthesized single-phase samples of the quaternary compound (PbTe)(0.55)(PbS)(0.1)(PbSe)(0.35) doped with Na and characterized their TE properties. We show that the dopant solubility is limited to 1 at. %. A very low lattice thermal conductivity of similar to 0.6 W m(-1) K-1 at 850 K is achieved at all dopant concentrations because of phonon scattering from point defects associated with solute atoms with high contrast atomic mass. As a result, a high TE figure of merit of approximately 1.5 is achieved at 823 K in heavily doped samples. Moreover, the figure of merit is greater than 1 over a wide temperature range above 675 K.

Original languageEnglish
Pages (from-to)9235-9240
Number of pages6
JournalACS Omega
Volume4
Issue number5
DOIs
Publication statusPublished - May-2019

Keywords

  • P-TYPE PBTE
  • FIGURE
  • PBSE
  • CONVERGENCE
  • EFFICIENCY
  • DESIGN
  • MERIT
  • HEAT

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