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High-performance Mg3Sb2-based thermoelectrics with reduced structural disorder and microstructure evolution
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DOI：10.1038/s41467-024-51120-3.png)
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Abstract
En 中文
Mg3Sb2-based thermoelectrics show great promise for next-generation thermoelectric power generators and coolers owing to their excellent figure of merit (zT) and earth-abundant composition elements. However, the complexity of the defect microstructure hinders the advancement of high performance. Here, the defect microstructure is modified via In doping and prolonged sintering time to realize the reduced structural disorder and microstructural evolution, synergistically optimizing electron and phonon transport via a delocalization effect. As a result, an excellent carrier mobility of similar to 174 cm(2) V-1 s(-1) and an ultralow kappa(lat) of similar to 0.42 W m(-1) K-1 are realized in this system, leading to an ultrahigh zT of similar to 2.0 at 723 K. The corresponding single-leg module demonstrates a high conversion efficiency of similar to 12.6% with a 425 K temperature difference, and the two-pair module of Mg3Sb2/MgAgSb displays similar to 7.1% conversion efficiency with a 276 K temperature difference. This work paves a pathway to improve the thermoelectric performance of Mg3Sb2-based materials, and represents a significant step forward for the practical application of Mg3Sb2-based devices.
Keywords:
CARRIER SCATTERING MECHANISM
THERMAL-CONDUCTIVITY
ZINTL COMPOUNDS
ENHANCEMENT
EFFICIENCY
TRANSPORT
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