Thermoelectric properties of SrTiO_3 nano-particles dispersed indium selenide bulk composites

摘要

We investigated the thermoelectric properties of the InSe, InSe/In_4Se_3 composite, and SrTiO_3 (STO) nano-particles dispersed InSe/In_4Se_3 bulk composites. The electrical conductivity of the InSe/In_4Se_3 composite with self-assembled phase separation is significantly increased compared with those of InSe and In_4Se_(3-δ) implying the enhancement of surface conductivity between grain boundaries. The thermal conductivity of InSe/In_4Se_3 composite is decreased compared to those of InSe. When the STO nano-particle dispersion was employed in the InSe/In_4Se_3 composite, a coherent interface was observed between nano-particle precipitates and the InSe bulk matrix with a reduction of the thermal conductivity.