Rare three-valence-band convergence leading to ultrahigh thermoelectric performance in all-scale hierarchical cubic SnTe

Three-valence-band ( i.e. , L, Σ and Λ) charge transport and multiple-scale defects were simultaneously achieved in p-type SnTe through dual incorporation of MnCdTe 2 and Ge, which contributed to a record-high ZT of ∼1.97 at 900 K.