Superior electron transport in the single-crystalline TiCoSb-based half-Heuslers.

ABSTRACT: Half-Heuslers emerged as promising candidates for medium- and high-temperature thermoelectric power generation. However, polycrystalline half-Heuslers inevitably suffer from the defect-dominated scattering of electrons that greatly limits the optimization of their electronic properties. Herein, high-quality TiCoSb-based single-crystals with a dimension above 1 cm have been obtained. Benefitting from the improved electron mobility, an average power factor of ~37 μW cm^-1 K^-2 in the temperature range between 307 and 973 K has been realized in the n-type single-crystalline Ti_1-xNb_xCoSb. In addition, Hf alloying results in the expansion of the weighted scattering phase space and enhances the anharmonic scattering rate, thereby effectively suppressing

SUBMITTER: Ye S 

PROVIDER: S-EPMC11850857 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature