Thermoelectric transport properties of diamond-like Cu1-xFe1+xS2 tetrahedral compounds

Yulong Li, Tiansong Zhang, Yuting Qin, Tristan Day, G. Jeffrey Snyder, Xun Shi, Lidong Chen

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

Polycrystalline samples with the composition of Cu1-xFe1+xS2 (x=0, 0.01, 0.03, 0.05, 0.1) were synthesized by a melting-annealing-sintering process. X-ray powder diffraction reveals all the samples are phase pure. The backscattered electron image and X-ray map indicate that all elements are distributed homogeneously in the matrix. The measurements of Hall coefficient, electrical conductivity, and Seebeck coefficient show that Fe is an effective n-type dopant in CuFeS2. The electron carrier concentration of Cu1-xFe1+xS2 is tuned within a wide range leading to optimized power factors. The lattice phonons are also strongly scattered by the substitution of Fe for Cu, leading to reduced thermal conductivity. We use Debye approximation to model the low temperature lattice thermal conductivity. It is found that the large strain field fluctuation introduced by the disordered Fe ions generates extra strong phonon scatterings for lowered lattice thermal conductivity.

Original languageEnglish (US)
Article number203705
JournalJournal of Applied Physics
Volume116
Issue number20
DOIs
StatePublished - Nov 28 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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