Charge transfer engineering to achieve extraordinary power generation in GeTe-based thermoelectric materials.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37126545.
- Also identified by DOI 10.1126/sciadv.adh0713 and PMC identifier 10132743.
- Licence recorded as CC BY-NC.
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Abstract
By the fine manipulation of the exceptional long-range germanium-telluride (Ge─Te) bonding through charge transfer engineering, we have achieved exceptional thermoelectric (TE) and mechanical properties in lead-free GeTe. This chemical bonding mechanism along with a semiordered zigzag nanostructure generates a notable increase of the average <i>zT</i> to a record value of ~1.73 in the temperature range of 323 to 773 K with ultrahigh maximum <i>zT</i> ~ 2.7. In addition, we significantly enhanced the Vickers microhardness numbers (<i>H</i><sub>v</sub>) to an extraordinarily high value of 247 <i>H</i><sub>v</sub> and effectively eliminated the thermal expansion fluctuation at the phase transition, which was problematic for application, by the present charge transfer engineering process and concomitant formation of microstructures. We further fabricated a single-leg TE generator and obtained a conversion efficiency of ~13.4% at the temperature difference of 463 K on a commercial instrument, which is located at the pinnacle of TE conversion.