Abstract Scope |
Thermoelectric conversion leaves minimal impact on the environment. Thermoelectric (TE) alloys with a high figure of merit (ZT) are desirable. There has been a growing interest in Half-Heusler (HH) phases considering their scalability and compositional flexibility for tuning TE properties for high ZT. In conventional HH compounds, we show that by employing the high-entropy alloy approach to stabilize compositionally complex compounds and exploiting the band structure effects, exceptional ZT can be obtained. Well-studied p-type Hf0.3Zr0.7CoSn0.3Sb0.7 compounds, resonantly doped with <1 at.% Al, have shown ZT~1.5 (ref.1). Recently, band structure calculation and entropy engineering indicate that n-type HH compounds may also lead to high ZT (ref.2), which opens a new pathway for exploring high thermoelectric performance in conventional alloy systems.
In collaboration with researchers at UVa and T.U. Darmstadt.
1. M.Mousumi etal, Mater. Today Phys. 28, 100900 (2022).
2. M.Mitra, C.Shen, R.Xie, H.Zhang, A.Weidenkaff, W.Xie, S.J Poon, in preparation. |