Demonstration of valley anisotropy utilized to enhance the thermoelectric power factor.

ABSTRACT: Valley anisotropy is a favorable electronic structure feature that could be utilized for good thermoelectric performance. Here, taking advantage of the single anisotropic Fermi pocket in p-type Mg₃Sb₂, a feasible strategy utilizing the valley anisotropy to enhance the thermoelectric power factor is demonstrated by synergistic studies on both single crystals and textured polycrystalline samples. Compared to the heavy-band direction, a higher carrier mobility by a factor of 3 is observed along the light-band direction, while the Seebeck coefficient remains similar. Together with lower lattice thermal conductivity, an increased room-temperature zT by a factor of 3.6 is found. Moreover, the first-principles calculations of 66 isostructural Zintl phase compounds are conduc

SUBMITTER: Li A 

PROVIDER: S-EPMC8448840 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature