Criteria for extending the operation periods of thermoelectric converters based on IV-VI compounds

Yatir Sadia, Tsion Ohaion-Raz, Ohad Ben-Yehuda, Meidad Korngold, Yaniv Gelbstein

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

The recent energy demands affected by the dilution of conventional energy resources and the growing awareness of environmental considerations, had positioned the research of renewable energy conversion methods in general and of thermoelectric direct conversion of thermal into electrical energies in particular, in the forefront of the currently active applicative sciences. IV-VI thermoelectric compounds (e.g. GeTe, PbTe and SnTe) and their alloys comprise some of the most efficient thermoelectric compositions ever reported. Yet a proper utilization of such materials in practical thermoelectric devices, still requires an overcoming the so-called technological "valley of death", including among others, transport properties' degradation, due to sublimation of volatile Te rich species, while being subjected to elevated temperatures for long periods of time. In an attempt to establish practical operation criteria for extending the operation periods of such thermoelectric converters, it is currently shown based on thermal gravimetric and metallurgical considerations that such harmful sublimation can be practically bridged over by limiting the maximal operating temperatures to the 410-430 °C range for GeTe rich alloys and to 510-530 °C for PbTe and SnTe rich alloys, depending of the thermoelectric leg's diameter.

Original languageEnglish
Pages (from-to)79-85
Number of pages7
JournalJournal of Solid State Chemistry
Volume241
DOIs
StatePublished - 1 Sep 2016

Keywords

  • Degradation
  • Evaporation
  • Germanium telluride
  • Lead telluride
  • Thermoelectric

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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