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Charge transfer engineering to achieve extraordinary power generation in GeTe-based thermoelectric materials
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DOI：10.1126/sciadv.adh0713.png)
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Abstract
En 中文
By the fine manipulation of the exceptional long-range germanium-telluride (GeTe) 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 zT to a record value of similar to 1.73 in the temperature range of 323 to 773 K with ultrahigh maximum zT similar to 2.7. In addition, we significantly enhanced the Vickers microhardness numbers (Hv) to an extraor-dinarily high value of 247 Hv and effectively eliminated the thermal expansion fluctuation at the phase transi-tion, 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 con -version efficiency of similar to 13.4% at the temperature difference of 463 Kona commercial instrument, which is located at the pinnacle of TE conversion.
Keywords:
THERMAL-CONDUCTIVITY
BAND CONVERGENCE
PERFORMANCE
FIGURE
MERIT
SUPPRESSION
SB
BI
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