“…Moreover, reducing the higher carrier concentration from the donor-like effect is also important for shifting the best thermoelectric performance to room temperature. 10,27 Strategies like solution-processed nanostructuring, 28−30 compositional control (such as doping Cu, 31−33 Ag, 34,35 Ge, 36 K 37 ) and mechanical deformation (mostly hot deformation, HD) 15,24,26,27,34,38−42 have been reported to manipulate the carrier concentration and other thermoelectric properties of the n-type Bi 2 Te 3 -based compounds. Various HD processes have been widely developed to optimize the carrier concentration and to reduce κ lat for enhancing the ZT, 15,24,26,27,34,38−43 and a state-of-the-art ZT of ∼1.3 at 450 K in the n-type Bi 2 Te 3−y Se y samples is realized by an HD approach.…”