Defect-Engineering-Stabilized AgSbTe2 with High Thermoelectric Performance
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.
This is the peer reviewed version of the following article: [Defect‐Engineering‐Stabilized AgSbTe2 with High Thermoelectric Performance. Advanced Materials 35, 11 (2023)], which has been published in final form at https://doi.org/10.1002/adma.202208994. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions: https://authorservices.wiley.com/author-resources/Journal-Authors/licensing/self-archiving.html#3.
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Work Title | Defect-Engineering-Stabilized AgSbTe2 with High Thermoelectric Performance |
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License | In Copyright (Rights Reserved) |
Work Type | Article |
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Publication Date | December 24, 2022 |
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Deposited | December 19, 2023 |
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