Growth of large size SnSe single crystal and comparison of its thermoelectric property with polycrystal

In this work, SnSe thermoelectric (TE) single crystals with size of 100 × 50 × 15 mm3 was grown by a Horizontal Bridgman method. The as-grown crystals had standard Pnma space group at room temperature and its measured stoichiometric ratio (Sn:Se) was nearly 1:1. Besides, polycrystalline SnSe was also prepared by a hot-pressing technique for comparison. The largest power factor PFcrystal along (100) facet was 5.08 μWcm−1 K−2 and the maximum...