Energy filtering-induced ultrahigh thermoelectric power factors in Ni<sub>3</sub>Ge.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40749065.
- Also identified by DOI 10.1126/sciadv.adv7113 and PMC identifier 12315978.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Traditional thermoelectric materials rely on low thermal conductivity to enhance their efficiency but suffer from inherently limited power factors. Innovative pathways to optimize electronic transport are thus crucial. Here, we achieve ultrahigh power factors in Ni<sub>3</sub>Ge-based systems through an unconventional thermoelectric materials design principle. When overlapping flat and dispersive bands are engineered to the Fermi level, charge carriers can undergo intense interband scattering, yielding an energy filtering effect similar to what has long been predicted in certain nanostructured materials. Via a multistep DFT-based screening method developed here, we find a family of L1<sub>2</sub>-ordered binary compounds with ultrahigh power factors up to 11 mW m<sup>-1</sup> K<sup>-2</sup> near room temperature, which are driven by an intrinsic phonon-mediated energy filtering mechanism. Our comprehensive experimental and theoretical study of these intriguing materials paves the way for understanding and designing high-performance scattering-tuned metallic thermoelectrics.