High thermoelectric figure-of-merit in p-type nanostructured (Bi,Sb) 2Te 3 fabricated via hydrothermal synthesis and evacuated-and-encapsulated sintering

Chia Jyi Liu, Hsin Chang Lai, Yen Liang Liu, Liang Ru Chen

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70 Citations (Scopus)

Abstract

High ZT values of nanostructured Bi 2-xSb xTe 3 for energy conversion are fabricated by hydrothermal methods followed by cold-pressing and sintering in an evacuated and encapsulated ampoule. We show that the sample with a nominal composition of x = 1.55 exhibits a dimensionless figure of merit ZT = 1.65 at 290 K and 1.75 at 270 K with significant 60-70% improvement of that of the commercial state-of-the-art Bi 2Te 3 materials around room temperature. The significant ZT improvement arises from the much-reduced thermal conductivity. The low thermal conductivity is mainly due to the increased phonon scattering in the nanostructured materials.

Original languageEnglish
Pages (from-to)4825-4831
Number of pages7
JournalJournal of Materials Chemistry
Volume22
Issue number11
DOIs
Publication statusPublished - 2012 Mar 21

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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