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Materials 2017, 10(4), 328; doi:10.3390/ma10040328

Thermoelectric Properties of Highly-Crystallized Ge-Te-Se Glasses Doped with Cu/Bi

1
Équipe Verres et Céramiques, ISCR CNRS UMR 6226, Université de Rennes 1, Rennes 35042, France
2
PRATS, ISCR CNRS UMR 6226, Université de Rennes 1, Rennes 35042, France
3
New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India
4
ENSICAEN, UNICAEN, CNRS, IUT-Caen, CRISMAT, Normandie Université, Caen 14050, France
5
Institut de Physique de Rennes, CNRS UMR 6251-Université de Rennes 1, Rennes 35042, France
6
School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Paz Vaqueiro
Received: 10 January 2017 / Revised: 17 March 2017 / Accepted: 20 March 2017 / Published: 23 March 2017
(This article belongs to the Special Issue Advances in Thermoelectric Materials)
View Full-Text   |   Download PDF [4726 KB, uploaded 23 March 2017]   |  

Abstract

Chalcogenide semiconducting systems are of growing interest for mid-temperature range (~500 K) thermoelectric applications. In this work, Ge20Te77Se3 glasses were intentionally crystallized by doping with Cu and Bi. These effectively-crystallized materials of composition (Ge20Te77Se3)100−xMx (M = Cu or Bi; x = 5, 10, 15), obtained by vacuum-melting and quenching techniques, were found to have multiple crystalline phases and exhibit increased electrical conductivity due to excess hole concentration. These materials also have ultra-low thermal conductivity, especially the heavily-doped (Ge20Te77Se3)100−xBix (x = 10, 15) samples, which possess lattice thermal conductivity of ~0.7 Wm−1 K−1 at 525 K due to the assumable formation of nano-precipitates rich in Bi, which are effective phonon scatterers. Owing to their high metallic behavior, Cu-doped samples did not manifest as low thermal conductivity as Bi-doped samples. The exceptionally low thermal conductivity of the Bi-doped materials did not, alone, significantly enhance the thermoelectric figure of merit, zT. The attempt to improve the thermoelectric properties by crystallizing the chalcogenide glass compositions by excess doping did not yield power factors comparable with the state of the art thermoelectric materials, as these highly electrically conductive crystallized materials could not retain the characteristic high Seebeck coefficient values of semiconducting telluride glasses. View Full-Text
Keywords: chalcogenide glasses; heavy doping; complete crystallization; thermal conductivity; power factor; thermoelectrics chalcogenide glasses; heavy doping; complete crystallization; thermal conductivity; power factor; thermoelectrics
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MDPI and ACS Style

Srinivasan, B.; Boussard-Pledel, C.; Dorcet, V.; Samanta, M.; Biswas, K.; Lefèvre, R.; Gascoin, F.; Cheviré, F.; Tricot, S.; Reece, M.; Bureau, B. Thermoelectric Properties of Highly-Crystallized Ge-Te-Se Glasses Doped with Cu/Bi. Materials 2017, 10, 328.

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