Global band convergence design for high-performance thermoelectric power generation in Zintls.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38753787.
- Also identified by DOI 10.1126/science.adn7265.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Electronic band convergence can have a beneficial impact on thermoelectric performance, but finding the right band-converged compositions is still time-consuming. We propose a method for designing a series of compositions with simultaneous band convergence in the high-entropy Yb<i><sub>x</sub></i>Ca<sub>1-</sub><i><sub>x</sub></i>Mg<i><sub>y</sub></i>Zn<sub>2-</sub><i><sub>y</sub></i>Sb<sub>2</sub> material by zeroing the weighted sum of crystal-field splitting energies of the parent compounds. We found that so-designed compositions have both larger power factors and lower thermal conductivities and that one of these compositions exhibits a large thermoelectric figure of merit value in comparison with to other p-type Zintls. Our material shows high stability both thermally and temporally. We then assembled an all-Zintl single-stage module, nontoxic and free of tellurium, that demonstrates an exceptional heat-to-electricity conversion efficiency exceeding 10% at a temperature difference of 475 kelvin.