Extending the temperature range of the <i>Cmcm</i> phase of SnSe for high thermoelectric performance.
basic_science · Level V
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- Record sourced from PubMed, PMID 41411440.
- Also identified by DOI 10.1126/science.adt0831.
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Abstract
Thermoelectric power generation requires high dimensionless figure of merit <i>ZT</i> across broad temperatures. The two-dimensional phonon and three-dimensional charge transports enable n-type-<i>Pnma</i> tin selenide (SnSe) crystals to show a peak <i>ZT</i> of ~3.0 at 748 kelvin. In this work, we focused on the high-symmetry <i>Cmcm</i> phase to boost two-dimensional phonon and three-dimensional charge transports and extended the high-performance (<i>ZT</i> ~ 3.0) plateau. By simultaneously broadening the <i>Cmcm</i>-phase stability window and enhancing lattice symmetry through lead alloying, we extended the high performance from a single temperature point to a wide temperature range of ~250 kelvin in rock salt-like <i>Cmcm</i> SnSe crystals rendered n-type through chlorine doping. An average <i>ZT</i> of ~3.0 was achieved between 673 and 923 kelvin, with a conversion efficiency of ~19.1% under a temperature difference of ~572 kelvin.