Thermoelectric properties of n-type Cu 4 Sn 7 S 16 -based compounds.

Copper-based chalcogenides have ultralow thermal conductivity and ultrahigh thermoelectric performance, but most of them are p-type semiconductors. It is urgent to develop n-type counterparts for high efficiency thermoelectric modules based on these copper based-chalcogenides. Cu 4 Sn 7 S 16 is an intrinsically n-type semiconductor with complex crystal structure and low thermal conductivity. However, its thermoelectric properties have not been well studied when compared to the well-known n-type CuFeS 2 . In this work, high-quality Cu 4 Sn 7 S 16 -based compounds are fabricated and their thermoelectric properties are systematically studied. Using Ag and Sb as dopants, the carrier concentration is tuned over a wide range. The electrical transport properties can be well described by the single parabolic band model with carrier acoustic phonons scattering. It is revealed that Cu 4 Sn 7 S 16 exhibits a low effective mass and relatively high mobility. The thermal conductivity is lower than 0.8 W m -1 K -1 from 300 to 700 K and shows a weak dependence on temperature. A maximum zT of 0.27 is obtained in Cu 3.97 Ag 0.03 Sn 7 S 16 at 700 K. Further enhancement of thermoelectric performance is possible when a more efficient n-type dopant is used.