Journal of Inorganic Materials ›› 2016, Vol. 31 ›› Issue (7): 751-755.DOI: 10.15541/jim20150599

• Orginal Article • Previous Articles     Next Articles

Synthesis and Thermoelectric Properties of Ag-doped SnSe

LI Song-Hao1, ZHANG Xin1, LIU Hong-Liang1, ZHENG Liang1, ZHANG Jiu-Xing1,2   

  1. (1. The Key Laboratory of Advanced Functional Material of Education Ministry, School of Materials Science and Engineering, Beijing University of technology, Beijing 100124, China. 2. School of Materials Science and Engineering, Hefei University of technology, Hefei 230009, China)
  • Received:2015-12-01 Revised:2016-01-13 Published:2016-07-20 Online:2016-06-22
  • About author:LI Song-Hao. E-mail:


SnSe material is one of the most promising state-of-art thermoelectric materials. The polycrystalline Ag-doped Sn1-xAgxSe (0.005≤x≤0.03) bulks were prepared by mechanical alloying and spark plasma sintering technique, and the composition, microstructure and thermoelectric properties were systematically studied by XRD, SEM and thermoelectric performance measurement. XRD results show that single-phase orthorhombic SnSe-based compounds can be prepared with small amount of Ag-doping (0.005≤x≤0.01), but with Ag doping amount increasing, small quantity of secondary phase, SnAgSe2, can be detected in the matrix. The carrier concentration and overall electrical properties (power factor) are significantly enhanced as a result of Ag doping. The power factor of Sn0.98Ag0.02Se increases up to 0.495×10-3 W/(m·K2), which is about 36% higher than that of SnSe material. Although the thermal conductivity increases slightly, the dimensionless figure of merit, ZT is still optimized for the Ag-doped samples. Sn0.98Ag0.02Se bulk shows optimal ZT value and the highest ZT of 0.82 is obtained at 823 K, which is the highest value reported for the polycrystalline SnSe-based thermoelectric materials.

Key words: SnSe, Ag-doped, Spark plasma sintering, thermoelectric property

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