High thermoelectric efficiency in co-doped degenerate p-type PbTe

John Androulakis, Ilyia Todorov, Duck Young Chung, Sedat Ballikaya, Guoyu Wang, Ctirad Uher, Mercouri Kanatzidis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


We explored the effect of K and K-Na substitution for Pb atoms in the lattice of PbTe, in an effort to test a hypothesis for the development of a resonant state that may enhance the thermoelectric power. At 300K the data can adequately be explained by a combination of a single and two-band model for the valence band of PbTe depending on hole density that varies in the range 1-15 × 1019 cm-3. A change in scattering mechanism was observed in the temperature dependence of the electrical conductivity, σ, for samples concurrently doped with K and Na which results in significantly enhanced σ at elevated temperatures and hence power factors. Thermal conductivity data provide evidence of a strong interaction between the light- and the heavy-hole valence bands at least up to 500K. Figure of merits as high as 1.3 at 700K were measured as a result of the enhanced power factors.

Original languageEnglish
Title of host publicationThermoelectric Materials 2010 - Growth, Properties, Novel Characterization Methods and Applications
PublisherMaterials Research Society
Number of pages6
ISBN (Print)9781605112442
Publication statusPublished - 2010

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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