| 초록 |
SnTe is the lead-free rock-salt analogue of PbTe. It appears to be promising for thermoelectric applications than PbTe because SnTe is environment-friendly. However, pristine SnTe has high electrical and thermal conductivity due to its high hole concentration from inherent Sn vacancies in the lattice, small band gap (~0.18 eV) and large separation between light-heavy hole valance bands. As a result, these lead to poor thermoelectric performance. In this presentation, we report an enhancement of electrical properties of p-type SnTe through inducing vacancy and charge balance it by doping trivalent cations, Indium. Specifically, Electrical conductivity reduced from 8000 S/cm to 2000 S/cm and Seebeck coefficient increased from low temperature. Thermoelectric performance improved over a broad temperature with a peak figure of merit (ZT) value of ~1.0 at 873K for dense pellets of SnTe prepared by spark plasma sintering. |
