ZnGeSb 2 : a promising thermoelectric material with tunable ultra-high conductivity

First principles calculations predict the promising thermoelectric material ZnGeSb 2 with a huge power factor ( S 2 σ / τ ) on the order of 3 × 10 17 W m −1 K −2 s −1 , due to the ultra-high electrical conductivity scaled by a relaxation time of around 8.5 × 10 25 Ω −1 m −1 s −1 , observed in its massive Dirac state.