High thermoelectric figure of merit in heavy hole dominated PbTe

Yanzhong Pei, Aaron Lalonde, Shiho Iwanaga, G. Jeffrey Snyder

Research output: Contribution to journalArticle

441 Scopus citations

Abstract

Thermoelectric transport properties of p-type PbTe:Na, with high hole concentrations of approximately 1020 cm-3, are reinvestigated from room temperature to 750 K. The greatly enhanced Seebeck coefficient at these doping levels can be understood by the presence of a sharp increase in the density of states around the Fermi level. As a result, the thermoelectric figure of merit, zT, reaches ∼1.4 at 750 K. The influence of these heavy hole carriers may contribute to a similarly high zT observed in related p-type PbTe-based systems such as Tl-doped PbTe and nanostructured composite materials.

Original languageEnglish (US)
Pages (from-to)2085-2089
Number of pages5
JournalEnergy and Environmental Science
Volume4
Issue number6
DOIs
StatePublished - Jun 2011

ASJC Scopus subject areas

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

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