A novel thermoelectric Cd 3 P 2 is obtained via regulating carrier concentrations. Ultrahigh carrier mobilities over 1500 cm 2 V −1 s −1 are observed at room temperature, which is attributed to small band effective mass and confirmed by the electronic structure calculation. Meanwhile, the intrinsically low lattice thermal conductivity below 1.0 W m −1 K −1 in the investigated temperature range is found due to the complex crystal structure and low sound velocity. Combined with high mobility and low thermal conductivity, a peak zT of 0.91 at 673 K and an excellent average zT of 0.57 over 300−673 K are obtained in Cd 3 P 2 -based compounds, which are record-high values among phosphides. This study highlights the potential of exploring highperformance novel thermoelectric materials in compounds with high carrier mobility.

No abstract

No abstract