Enhanced thermopower via carrier energy filtering in solution-processable Pt-Sb2Te3 nanocomposites

Dong Kyun Ko, Yijin Kang, Christopher B. Murray

Research output: Contribution to journalArticlepeer-review

180 Scopus citations

Abstract

This work demonstrates the first solution-processable metal-semiconductor nanocomposites with enhanced thermoelectric properties via carrier energy filtering. Platinum nanocrystals are embedded in a p-type antimony(III) telluride (Sb2Te3) semiconductor matrix, thus introducing band-bending potentials for holes. By scattering low energy holes, an increase in thermopower is observed. Introduction of Pt nanocrystals also increases carrier concentration thereby partially compensating for reduced electrical conductivity due to the decreased mobility. At room temperature, an improvement in thermoelectric power factor was achieved compared to that of the Sb 2Te3 films. This work highlights the possibility of combining a diverse set of n- and p-type semiconductor matrices with nanocrystals to engineer and optimize energy-dependent carrier scattering with the ease of materials processing.

Original languageEnglish (US)
Pages (from-to)2841-2844
Number of pages4
JournalNano Letters
Volume11
Issue number7
DOIs
StatePublished - Jul 13 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Keywords

  • Thermoelectrics
  • antimony telluride
  • energy filter
  • nanocomposites
  • solution process

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