Effects of Doping on the Thermoelectric Properties of Misfit Layer Sulfides

Abstract

We investigated the influence of doping on the (BiS)_1.2(TiS₂)₂ misfit layer sulfides as a novel thermoelectric material. The substitutional doping was attempted to improve its thermoelectric performance through decreasing the carrier concentration. The alkaline earth doping successfully reduced the carrier concentration. However, ZT value could not be optimized due to a slight decrease in Seebeck coefficient and an increase in lattice thermal conductivity. We analyzed this strange result and discussed the effect of structural change by doping on the thermoelectric properties of (BiS)_1.2(TiS₂)₂.