The criteria for beneficial disorder in thermoelectric solid solutions

Heng Wang, Aaron D. Lalonde, Yanzhong Pei*, G. Jeffery Snyder

*Corresponding author for this work

Research output: Contribution to journalArticle

193 Scopus citations

Abstract

Forming solid solutions has long been considered an effective approach for good thermoelectrics because the lattice thermal conductivities are lower than those of the constituent compounds due to phonon scattering from disordered atoms. However, this effect could also be compensated by a reduction in carrier mobility due to electron scattering from the same disorder. Using a detailed study of n-type (PbTe)1-x (PbSe)x solid solution (0 ≤ x ≤ 1) as a function of composition, temperature, and doping level, quantitative modeling of transport properties reveals the important parameters characterizing these effects. Based on this analysis, a general criterion for the improvement of zT due to atomic disorder in solid solutions is derived and can be applied to several thermoelectric solid solutions, allowing a convenient prediction of whether better thermoelectric performance could be achieved in a given solid solution. Alloying is shown to be most effective at low temperatures and in materials that are unfavorable for thermoelectrics in their unalloyed forms: high lattice thermal conductivity (stiff materials with low Grüneisen parameters) and high deformation potential.

Original languageEnglish (US)
Pages (from-to)1586-1596
Number of pages11
JournalAdvanced Functional Materials
Volume23
Issue number12
DOIs
StatePublished - Mar 25 2013

Keywords

  • alloys
  • figure of merit
  • solid solutions
  • thermoelectrics

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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