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Influence of group IV-Te alloying on nanocomposite structure and thermoelectric properties of Bi2Te3 compounds

 
: Ebling, D.G.; Jacquot, A.; Böttner, H.; Kirste, L.; Schmidt, J.; Aguirre, M.

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Journal of Electronic Materials 38 (2009), No.7, pp.1450-1455
ISSN: 0361-5235
ISSN: 1543-186X
English
Journal Article
Fraunhofer IPM ()
Fraunhofer IAF ()
Fraunhofer IFAMDD ()
melt spin; spin casting; spark plasma sintering; nanocomposite; Bi2Te3; compound; PbTe; SnTe

Abstract
Thermoelectric compounds based on doped bismuth telluride and its alloys have recently attracted increasing interest. Due to their structural features they show increased values of the thermoelectric figure of merit (ZT). A promising approach to improve the thermoelectric properties is to manufacture nanocomposite materials exhibiting lower thermal conductivities and higher ZT. The ZT value of compounds can be shifted reasonably to higher values (> 1) by alloying with IV-Te materials and adequate preparation methods to form stable nanocomposites. The influence of PbTe and Sn on the thermoelectric properties is studied as a function of concentration and preparation methods. Melt spinning and spark plasma sintering were applied to form nanocomposite materials that were mechanically and thermodynamically stable for applications in thermoelectric devices. The structural properties are discussed based on analysis by transmission electron microscopy and x-ray diffraction.

: http://publica.fraunhofer.de/documents/N-101696.html