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Title: Defect-engineering-stabilized AgSbTe2 with high thermoelectric performance
Authors: Zhang, Yu
Li, Zhi
Singh, Saurabh
Nozariasbmarz, Amin
Li, Wenjie
Genç, Aziz
Xia, Yi
Keywords: Band flattening
Defect engineering
Mid-temperature region
Waste heat recovery
Publisher: Wiley
Abstract: Thermoelectric (TE) generators enable the direct and reversible conversion between heat and electricity, providing applications in both refrigeration and power generation. In the last decade, several TE materials with relatively high figures of merit (zT) have been reported in the low- and high-temperature regimes. However, there is an urgent demand for high-performance TE materials working in the mid-temperature range (400–700 K). Herein, p-type AgSbTe2 materials stabilized with S and Se co-doping are demonstrated to exhibit an outstanding maximum figure of merit (zTmax) of 2.3 at 673 K and an average figure of merit (zTave) of 1.59 over the wide temperature range of 300–673 K. This exceptional performance arises from an enhanced carrier density resulting from a higher concentration of silver vacancies, a vastly improved Seebeck coefficient enabled by the flattening of the valence band maximum and the inhibited formation of n-type Ag2Te, and ahighly improved stability beyond 673 K. The optimized material is used to fabricate a single-leg device with efficiencies up to 13.3% and a unicouple TE device reaching energy conversion efficiencies up to 12.3% at a temperature difference of 370 K. These results highlight an effective strategy to engineer high-performance TE material in the mid-temperature range.
Description: Y.Z. acknowledges the support from SBIR program from NanoOhmics. W.L. and B.P. acknowledge the financial support from the Army RIF program. A.N. acknowledges the financial support through Office of Naval Research through grant number N00014‐20‐1‐2602. N.L. acknowledges the support from SBIR program through Nextgen. S.P. acknowledges the financial support from NSF CREST CREAM program through Norfolk State University. Work at Northwestern was supported in part by award 70NANB19H005 from U.S. Department of Commerce, National Institute of Standards and Technology as part of the Center for Hierarchical Materials Design (CHiMaD). The Northwestern Quest computational resources are also acknowledged.
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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