Journal of Inorganic Materials ›› 2011, Vol. 26 ›› Issue (7): 680-684.DOI: 10.3724/SP.J.1077.2011.00680

• Research Paper • Previous Articles     Next Articles

Enhanced Thermoelectric Performance in Na/Se Doped p-type AgSbTe2 Compound

DU Bao-Li1, 2, LI Han1, TANG Xin-Feng1   

  1. (1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China; 2. School of Physics and Chemistry, Henan Polytechnic University, Jiaozuo 453000, China)
  • Received:2010-09-20 Revised:2010-12-12 Published:2011-07-20 Online:2011-06-20
  • Supported by:

    National Basic Research Program of China (2007CB607501); Fundamental Research Funds for the Central Universities (2010-IV-046)

Abstract: Two types of Na-doped and Na/Se co-doped polycrystalline, sintered samples of p-type AgSbTe2 thermo- electric compounds were prepared from high purity elements by a melt-quench technique followed by spark plasma sintering (Ⅰ: with excess Na or Na/Se, AgNa0.01SbTe2, AgNa0.01SbTe2Se0.04; Ⅱ: replacing corresponding elements by Na or Na/Se, Ag0.99Na0.01SbTe2, Ag0.99Na0.01SbTe1.96Se0.04). The impacts of Na-doping, Na/Se co-doping and doping form on electrical and thermal transport properties were investigated. Meanwhile, by comparing the thermoelectric performance of samples with different kinds of doping form, the optimal doping method is obtained. That is Na replacing Ag, Se replacing Te with appropriate amount of excess Se. Due to the elevation of Seebeck coefficient by Na-doping and optimization of electrical and thermal conductivities by Se-doping, a maximum of ZT merit of 1.4 is achieved at 620 K for sample Ag0.99Na0.01SbTe1.96Se0.04, representing a 17% enhancement with respect to the undoped sample at the same temperature.

Key words: AgSbTe2, thermoelectric property, Se, Na, doping

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