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The vast majority of research on PbTe thermoelectrics has focused merely on advancing medium-temperature power generator, often neglecting near-room-temperature thermoelectric properties, thus constraining its potential applications at low temperatures. Here, we realize the prominent improvement of the ratio of weighted mobility and lattice thermal conductivity in n-type PbTe thermoelectrics by manipulating the configurational entropy of the material. The severe lattice distortion induced by entropy increase causes a remarkable strain field, which powerfully scatters phonon and significantly lowers the lattice thermal conductivity. Simultaneously, entropy engineering effectively elevates the solubility limit of S in PbTe, which accelerates the flattening of the conduction band, leading to a larger Seebeck coefficient. As a result, we obtain an impressive near-room-temperature zT in the entropy-driven stabilized n-type PbTe. Based on this, we further fabricated a seven-pair thermoelectric module by integrating commercial p-type Bi2Te3, achieving a exceptional cooling temperature difference of 36.8 K at 300 K, and a maximum conversion efficiency of 3.2 % when the hot-side temperature is 540 K. Our present finding demonstrates promising thermoelectric applications for PbTe-based materials near room temperature. © 2025 Elsevier B.V.
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Chemical Engineering Journal
ISSN: 1385-8947
Year: 2025
Volume: 506
1 3 . 4 0 0
JCR@2023
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 1
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