Thermoelectric performance enhancement of Cu 2 S by Se doping leading to a simultaneous power factor increase and thermal conductivity reduction

A series of single-phased Cu 2 S 1−x Se x bulks were prepared by using mechanical alloying (MA) combined with spark plasma sintering (SPS). Our results suggest that the TE properties of Cu 2 S can be greatly enhanced by simultaneously increasing PF and decreasing κ via doping a sole Se element.