Combination of large nanostructures and complex band structure for high performance thermoelectric lead telluride

Yanzhong Pei, Nicholas A. Heinz, Aaron Lalonde, G. Jeffrey Snyder*

*Corresponding author for this work

Research output: Contribution to journalArticle

122 Scopus citations

Abstract

The complexity of the valence band structure in p-type PbTe has been shown to enable a significant enhancement of the average thermoelectric figure of merit (zT) when heavily doped with Na. It has also been shown that when PbTe is nanostructured with large nanometer sized Ag 2Te precipitates there is an enhancement of zT due to phonon scattering at the interfaces. The enhancement in zT resulting from these two mechanisms is of similar magnitude but, in principle, decoupled from one another. This work experimentally demonstrates a successful combination of the complexity in the valence band structure with the addition of nanostructuring to create a high performance thermoelectric material. These effects lead to a high zT over a wide temperature range with peak zT > 1.5 at T > 650 K in Na-doped PbTe/Ag 2Te. This high average zT produces 30% higher efficiency (300-750 K) than pure Na-doped PbTe because of the nanostructures, while the complex valence band structure leads to twice the efficiency as the related n-type La-doped PbTe/Ag 2Te without such band structure complexity.

Original languageEnglish (US)
Pages (from-to)3640-3645
Number of pages6
JournalEnergy and Environmental Science
Volume4
Issue number9
DOIs
StatePublished - Sep 2011

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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