Synthesis of SnTe/AgSbSe2 nanocomposite as a promising lead-free thermoelectric material

摘要

A series of SnTe-AgSbSe₂ composites were synthesized by a zone-melting method. The nanostructure of the composites was determined by the high resolution transmission electron microscope. The results show that the lattice thermal conductivity is decreased to ～0.6?W/m·K at 820?K due to the intense scattering of phonon. Also, the carrier concentration increases with AgSbSe₂ amounts, and a large effective mass of ～ 4m₀ at room temperature appears at a high carrier concentration of ～2?×?1021/cm3. A relatively high thermoelectric figure of merit ZT of 0.92?at 820?K is obtained by composition optimization. It is indicated that the SnTe-AgSbSe₂ composite should be a promising thermoelectric material.