Enhancing the Figure of Merit of Heavy-Band Thermoelectric Materials Through Hierarchical Phonon Scattering

摘要

Abstract Hierarchical scattering is suggested as an effective strategy to enhance the figure of merit zT of heavy-band thermoelectric materials. Heavy-band FeNbSb half-Heusler system with intrinsically low carrier mean free path is demonstrated as a paradigm. An enhanced zT of 1.34 is obtained at 1150 K for the Fe 1.05 Nb 0.75 Ti 0.25 Sb compound with intentionally designed hierarchical scattering centers.