Thermoelectric Properties of Cl-Doped BiCuSeO Oxyselenides

BiCuSeO oxyselenide has been reported as a promising thermoelectric material because of its special layered structure. Here, we attempt to synthesize n -type BiCuSeO using chlorine to substitute the Se site with the modification of (Cu 2 Se 2 ) 2− layers. Our results indicate that Cl doping can influence the electrical and thermal transport properties of BiCuSeO bulk materials. The significant reduction in electrical conductivity (from 40 S cm −1 to 10 S cm −1 ) demonstrates that Cl doping can indeed affect (Cu 2 Se 2 ) 2− conducting layers. It may be desirable to obtain n -type BiCuSeO by heavy doping of Cl or other elements.