Scattering anisotropy effect on layered thermoelectric materials

Kazuma Ikeda, Toshihisa Yago, Masanori Matoba

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effect of scattering anisotropy caused by mass anisotropy on the thermoelectric figure of merit is investigated. The simplest electron transport model is considered assuming a single-band, parabolic energy dispersion relation and ionized impurity scattering, which is assumed to be elastic. The wave-vector dependence of the relaxation time is fully considered within the relaxation-time approximation. Transport coefficients are calculated using the anisotropic relaxation time at finite temperatures. The figure of merit perpendicular to the axis with the largest effective mass is shown to decrease as the effective mass ratio increases. This result indicates that the weak confinement of electrons into layers of bulk materials cannot be the direct cause of the enhancement of the figure of merit along the layers.

Original languageEnglish
Pages (from-to)4184-4188
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume46
Issue number7 A
DOIs
Publication statusPublished - 2007 Jul 4

Keywords

  • Anisotropy
  • Effective mass
  • Figure of merit
  • Layer
  • Scattering
  • Thermoelectric

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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