Great enhancements in the thermoelectric power factor of BiSbTe nanostructured films with well-ordered interfaces

Hsiu Cheng Chang, Chun-Hua Chen*, Yung Kang Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

An innovative concept of twin-enhanced thermoelectricity was proposed to fundamentally resolve the high electrical resistance while not degrading the phonon scattering of the thermoelectric nanoassemblies. Under this frame, a variety of highly oriented and twinned bismuth antimony telluride (BixSb2−xTe3) nanocrystals were successfully fabricated by a large-area pulsed-laser deposition (PLD) technique on insulated silicon substrates at various deposition temperatures. The significant presence of the nonbasal- and basal-plane twins across the hexagonal BiSbTe nanocrystals, which were experimentally and systematically observed for the first time, evidently contributes to the unusually high electrical conductivity of 2700 S cm−1 and the power factor of 25 μW cm−1 K−2 as well as the relatively low thermal conductivity of 1.1 W m−1 K−1 found in these nanostructured films.

Original languageEnglish
Pages (from-to)7017-7025
Number of pages9
JournalNanoscale
Volume5
Issue number15
DOIs
StatePublished - 11 Jul 2013

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