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N-type Mg3Sb2 alloys show great potential for wasted heat energy harvesting due to their promising thermoelectric properties. In this work, we discover that doping transition element Ag into the n-type Mg3Sb2 alloy can effectively optimize the power factor and suppress the lattice thermal conductivity simultaneously. A high power factor of 19.6 μW cm−1 K−2 is obtained at 673 K owing to the increased electrical conductivity. At the same time, the lattice thermal conductivity is reduced to 0.50 W m-1 K-1 as a result of enhanced phonon scattering induced Ag atoms. These improvements lead to a peak figure of merit (ZT) of 1.64 at 673 K as well as a high average ZT of 1.27 is obtained from 323K to 673K. Furthermore, a thermoelectric single leg device with a competitive conversion efficiency of ~11% under a hot-side temperature of 673 K is fabricated successfully, suggesting an exceptional potential in the future application for in waste heat energy harvesting and thermoelectric power generation.

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  This is the peer reviewed version of the following article: J. Li, R. Chetty, Z. Liu, W. Gao, T. Mori, Enhancing the Thermoelectric Performance of n-Type Mg3Sb2-Based Materials via Ag Doping. Small 2024, 21, 2408059, which has been published in final form at https://doi.org/10.1002/smll.202408059. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

Keyword: thermoelectric

Date published: 2024-11-13

Publisher: Wiley

Journal:

• Small (ISSN: 16136810) vol. 2 2408059

Funding:

• JST-Mirai Program JPMJMI19A1

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5887

First published URL: https://doi.org/10.1002/smll.202408059

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Updated at: 2025-11-13 08:30:27 +0900

Published on MDR: 2025-11-13 08:22:10 +0900