Realizing the Ultralow Lattice Thermal Conductivity of Cu₃SbSe₄ Compound via Sulfur Alloying Effect.

ABSTRACT: Cu₃SbSe₄ is a potential p-type thermoelectric material, distinguished by its earth-abundant, inexpensive, innocuous, and environmentally friendly components. Nonetheless, the thermoelectric performance is poor and remains subpar. Herein, the electrical and thermal transport properties of Cu₃SbSe₄ were synergistically optimized by S alloying. Firstly, S alloying widened the band gap, effectively alleviating the bipolar effect. Additionally, the substitution of S in the lattice significantly increased the carrier effective mass, leading to a large Seebeck coefficient of ~730 μVK^-1. Moreover, S alloying yielded point defect and Umklapp scattering to significantly depress the lattice thermal conductivity, and thus brought about an ultralow

SUBMITTER: Zhao L 

PROVIDER: S-EPMC10574639 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature