A mesoporous anisotropic n-type Bi2Te3 monolith with low thermal conductivity as an efficient thermoelectric material

Yichi Zhang, Tristan Day, Matthew L. Snedaker, Heng Wang, Stephan Krämer, Christina S. Birkel, Xiulei Ji, Deyu Liu, G. Jeffrey Snyder, Galen D. Stucky

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

A mesoporous Bi2Te3 monolith with ≈20% porosity is fabricated by hot-pressing mesoporous powders. The mesostructures are able to transport carriers and scatter phonons efficiently. The reduction (≈60%) of the thermal conductivity is sufficient to compensate for the loss of electrical conductivity perpendicular to the direction of applied pressure, leading to an enhanced zT of 0.7, highest among all reported self-doped, n-type Bi 2Te3 at similar temperatures.

Original languageEnglish (US)
Pages (from-to)5065-5070
Number of pages6
JournalAdvanced Materials
Volume24
Issue number37
DOIs
StatePublished - Sep 25 2012
Externally publishedYes

Keywords

  • anisotropic materials
  • bismuth telluride
  • mesoporous materials
  • thermal conductivity
  • thermoelectric materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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