Fig. 7: Performance evaluation of SnSe, SnSe-0.75%Te, and SnSe-0.75%Te-0.7%Mo.

a Quality factor (B) as a function of temperatures. b The average ZT (ZTave) at 300–723 K. c Single-leg conversion efficiencies (η) of SnSe-0.75%Te-0.7%Mo as functions of current at different hot-end temperatures (Th), with the constant cold-end temperature (Tc) of ~ 300 K. d The comparison of η between samples in this work and other n-type thermoelectric materials58,59,60,61,62,63,64,65.