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A new thermoelectric material Ag_8SnS_6,with ultra-low thermal conductivity in thin film shape,is prepared on indium tin oxide coated glass(ITO) substrates using a chemical process via the electrodeposition technique.The structural,thermal and electrical properties are studied and presented in detail,which demonstrate that the material is of semiconductor type,orthorhombic structure,with a band gap in the order of 1.56 eV and a free carrier concentration of 1.46 × 10~(17) cm~(-3).The thermal conductivity,thermal diffusivity,thermal conduction mode,Seebeck coefficient and electrical conductivity are determined using the photo-thermal deflection technique combined with the Boltzmann transport theory and Cahill’s model,showing that the Ag_8SnS_6 material has a low thermal conductivity of 3.8 Wm~(-1)K~(-1),high electrical conductivity of 2.4 × 10~5 Sm~(-1),Seebeck coefficient of-180 μVK~(-1) and a power factor of 6.9mWK~(-2)m~(_1),implying that it is more efficient than those obtained in recently experimental investigations for thermoelectric devices.
A new thermoelectric material Ag_8SnS_6, with ultra-low thermal conductivity in thin film shape, is prepared on indium tin oxide coated glass (ITO) substrates using a chemical process via the electrodeposition technique. The structural, thermal and electrical properties are studied and presented in detail, which demonstrates that the material is of semiconductor type, orthorhombic structure, with a band gap in the order of 1.56 eV and a free carrier concentration of 1.46 × 10 ~ (17) cm ~ (-3). diffusivity, thermal conduction mode, Seebeck coefficient and electrical conductivity are determined using the photo-thermal deflection technique combined with the Boltzmann transport theory and Cahill’s model, showing that the Ag_8SnS_6 material has a low thermal conductivity of 3.8 Wm -1 K ~ (-1), high electrical conductivity of 2.4 × 10 -5 Sm -1, Seebeck coefficient of-180 μVK -1 and a power factor of 6.9 mWK -2 -2 m -1, implying that it is more efficient than those obtained i n recently experimental investigations for thermoelectric devices.