Issue 40, 2015

Fabrication of thermoelectric materials – thermal stability and repeatability of achieved efficiencies

Abstract

Metal chalcogenides have delivered the highest efficiencies among thermoelectric materials. Although the thermal stability of thermoelectric materials at device operating temperatures has been of concern, recent studies have reported the efficiencies of materials prepared with different fabrication techniques. Here, we have fabricated a p-type, multiphase lead chalcogenide compound of (PbTe)0.55(PbS)0.35(PbSe)0.1, with three common fabrication techniques of quenched, quenched–annealed and furnace cooled followed by spark plasma sintering. The compound contains PbS-rich precipitates within a PbTe-rich matrix. The achieved samples from various fabrication procedures demonstrate distinct microstructures that evolve with thermal cycling. We have shown that the thermoelectric efficiency of metastable compound is irreversible during thermal cycling, and changes by only three thermal cycles during measurements. Our findings highlight the importance of the choice of fabrication and post-processing techniques for thermoelectric materials.

Graphical abstract: Fabrication of thermoelectric materials – thermal stability and repeatability of achieved efficiencies

Supplementary files

Article information

Article type
Paper
Submitted
21 jul. 2015
Accepted
25 ago. 2015
First published
27 ago. 2015

J. Mater. Chem. C, 2015,3, 10610-10615

Author version available

Fabrication of thermoelectric materials – thermal stability and repeatability of achieved efficiencies

S. Aminorroaya Yamini, M. Brewis, J. Byrnes, R. Santos, A. Manettas and Y. Z. Pei, J. Mater. Chem. C, 2015, 3, 10610 DOI: 10.1039/C5TC02210J

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