Fabrication and Thermoelectric Properties of Single-Crystal Argyrodite Ag₈SnSe₆

Recently, polycrystalline argyrodite Ag8SnSe6 has shown promising thermoelectric performance, which largely relies on the ultralow lattice thermal conductivity. However, the thermoelectric properties of single-crystalline Ag8SnSe6 have been unavailable so far. In this work, Ag8SnSe6 single crystals, with a highly preferred orientation of (110), are grown by a vertical Bridgman technique. Thermoelectric properties parallel and perpendicular to...