Carrier-phonon decoupling in perovskite thermoelectrics via entropy engineering.

ABSTRACT: Thermoelectrics converting heat and electricity directly attract broad attentions. To enhance the thermoelectric figure of merit, zT, one of the key points is to decouple the carrier-phonon transport. Here, we propose an entropy engineering strategy to realize the carrier-phonon decoupling in the typical SrTiO₃-based perovskite thermoelectrics. By high-entropy design, the lattice thermal conductivity could be reduced nearly to the amorphous limit, 1.25 W m^-1 K^-1. Simultaneously, entropy engineering can tune the Ti displacement, improving the weighted mobility to 65 cm² V^-1 s^-1. Such carrier-phonon decoupling behaviors enable the greatly enhanced μ_W/κ_L of ~5.2 × 10³ cm³ K J^-1</

SUBMITTER: Zheng Y 

PROVIDER: S-EPMC11369264 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature