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

doi:10.3724/SP.J.1077.2011.00680

Abstract

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, AgNa_0.01SbTe₂, AgNa_0.01SbTe₂Se_0.04; Ⅱ: replacing corresponding elements by Na or Na/Se, Ag_0.99Na_0.01SbTe₂, Ag_0.99Na_0.01SbTe_1.96Se_0.04). 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 Ag_0.99Na_0.01SbTe_1.96Se_0.04, representing a 17% enhancement with respect to the undoped sample at the same temperature.

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

CLC Number:

TB34

DU Bao-Li, LI Han, TANG Xin-Feng. Enhanced Thermoelectric Performance in Na/Se Doped p-type AgSbTe₂ Compound[J]. Journal of Inorganic Materials, 2011, 26(7): 680-684.

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

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