Composites of Bi2-xSbxTe3 nanocrystals and fullerene molecules for thermoelectricity

► C60 doping of Bi-Sb-Te has acceptor effect. ► Fullerene molecules prevent recrystallization in Bi-Sb-Te nanocomposites. ► C60 in Bi-Sb-Te nanocomposites essentially reduces lattice thermal conductivity. ► Thermoelectric figure of merit in nanocomposite C60-Bi-Sb-Te enhanced.