| 초록 |
In order to expand the commercial market of thermoelectric (TE) technology, it is necessary to develop high-performance TE materials capable of mass production. Recently, single crystal SnSe showed the best TE performance, which is composed of eco-friendly and abundant elements. However, single crystal SnSe is difficult to commercialize due to difficult manufacturing process and poor mechanical stability. On the contrary, despite polycrystalline SnSe materials are mechanically stable and capable of mass production, the performance of those are significantly lower than that of a single crystal material, especially n-type materials. Here we report our synthesis of n-type polycrystalline SnSe system by PbSe alloying and chlorine-cadmium co-doping, namely, Cdx(Pb0.2Sn0.8)1-xSe0.98Cl0.02 (0 ≤ x ≤ 0.01). By optimizing Cd concentration, lattice thermal conductivity was significantly reduced, leading to thermoelectric figure of merit (ZT) of ~1.7 at 873K for optimized sample. |
