| 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 higher than that of PbTe, which was the best TE material, while being 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, in the case of polycrystalline SnSe, which is mechanically stable and capable of mass production, there is a problem that the performance is 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 Cl, Cd co-doping. 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 |
