We investigated the thermoelectric properties of the InSe, InSe/In 4Se3 composite, and SrTiO3 (STO) nano-particles dispersed InSe/In4Se3 bulk composites. The electrical conductivity of the InSe/In4Se3 composite with self-assembled phase separation is significantly increased compared with those of InSe and In4Se3-δ implying the enhancement of surface conductivity between grain boundaries. The thermal conductivity of InSe/In4Se3 composite is decreased compared to those of InSe. When the STO nano-particle dispersion was employed in the InSe/In 4Se3 composite, a coherent interface was observed between nano-particle precipitates and the InSe bulk matrix with a reduction of the thermal conductivity.
Bibliographical noteFunding Information:
This research was supported by the Basic Science Research Program (2011-0021335), the Nano-Material Technology Development Program (2011-0030147), the Mid-Career Research Program (Strategy) (No. 2012R1A2A1A03005174) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology, and a grant from the Energy Efficiency & Resources program of the Korea Institute of Energy Technology Evaluation Planning (KETEP) funded by the Korea government Ministry of Knowledge Economy (No. 20112010100100), and SK Innovation.