Browsing by Author "Kuo, Yung-Kang"

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Great enhancements in the thermoelectric power factor of BiSbTe nanostructured films with well-ordered interfaces
(2013)
Chang, Hsiu-Cheng
;
Chen, Chun-Hua
;
Kuo, Yung-Kang
;
材料科學與工程學系
;
Department of Materials Science and Engineering
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 similar to 2700 S cm(-1) and the power factor of similar to 25 mu W cm(-1) K-2 as well as the relatively low thermal conductivity of similar to 1.1 W m(-1) K-1 found in these nanostructured films.