Realized high power factor and thermoelectric performance in Cu2SnSe3

New thermoelectric compounds Cu2Sn1-xFexSe3 (0 <= x <= 0.2) have been investigated, and the results indicate that the electrical conductivity of Cu2Sn1-xFexSe3(x > 0) is obviously enhanced by Fe doping due to the increased carriers concentration, and then the significant improved power factor is obtained. As a result, the figure of merit reaches 1.1 at -820 K for Fe-doped compounds Cu2Sn1-xFexSe3 with x = 0.05 and 0.1 due to the higher power factor and moderate thermal conductivity, which is about 2.4 times that of pure Cu2SnSe3 at the same temperature. Our results indicate that Fe-doped compounds Cu2Sn1-xFexSe3 can be hoped to utilize as a potential environmental thermoelectric materials. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.