Phonon scattering through a local anisotropic structural disorder in the thermoelectric solid solution Cu2Zn1- xFe xGeSe4

Wolfgang G. Zeier, Yanzhong Pei, Gregory Pomrehn, Tristan Day, Nicholas Heinz, Christophe P. Heinrich, G. Jeffrey Snyder*, Wolfgang Tremel

*Corresponding author for this work

Research output: Contribution to journalArticle

75 Scopus citations

Abstract

Inspired by the promising thermoelectric properties of chalcopyrite-like quaternary chalcogenides, here we describe the synthesis and characterization of the solid solution Cu2Zn1-xFexGeSe 4. Upon substitution of Zn with the isoelectronic Fe, no charge carriers are introduced in these intrinsic semiconductors. However, a change in lattice parameters, expressed in an elongation of the c/a lattice parameter ratio with minimal change in unit cell volume, reveals the existence of a three-stage cation restructuring process of Cu, Zn, and Fe. The resulting local anisotropic structural disorder leads to phonon scattering not normally observed, resulting in an effective approach to reduce the lattice thermal conductivity in this class of materials.

Original languageEnglish (US)
Pages (from-to)726-732
Number of pages7
JournalJournal of the American Chemical Society
Volume135
Issue number2
DOIs
StatePublished - Jan 16 2013

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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