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Enhanced thermoelectric performance in Na-dopedp-type nonstoichiometric AgSbTe2compound

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
509
Issue
5
Identifiers
DOI: 10.1016/j.jallcom.2010.10.131
Keywords
  • Thermoelectric Material
  • Silver Antimony Telluride
  • Na
  • Thermoelectric Property

Abstract

Abstract Polycrystalline Na-doped p-type AgSbTe 2+ y ( y = 0, 0.02) compounds were prepared from high purity elements by a melt-quench technique followed by spark plasma sintering. The influences of Na doping and excess Te on the thermoelectric transport properties were investigated. Both Na and Te act as acceptor in AgSbTe 2 compound. Substituting Ag with Na has great influence on electron band structure and can enhance the Seebeck coefficient effectively. Adding excess Te in Na-doped samples plays a great role in optimizing the electrical and thermal conductivity. Overall, the thermoelectric performance of the Na doped nonstoichiometric AgSbTe 2 samples is greatly improved and a ZT of 1.50 is achieved at about 570 K for Ag 0.99Na 0.01SbTe 2.02 sample, representing a 30% enhancement with respect to an undoped sample at the same temperature.

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