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Thermoelectric cooling materials based on Bi2Te3 have a long history of unsurpassed performance near room temperature. Recently, research into price-competitive Mg3(Bi, Sb)2-based materials have been focused on replacing traditional cooling materials. Here, we investigated the thermoelectric properties of Mg3.2Bi1.998−xSbxTe0.002Cu0.005 (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) polycrystalline compounds. In all temperature regions, electrical resistivity and Seebeck coefficient are increased with Sb concentration. The electronic transport properties of Sb-alloyed compounds are maximized by synergistically combined band engineering approaches such as band structure change caused by lattice strain, increased electronic density of states, and chemical potential shift, leading to exceptionally high-power factor values of over 3.0 mW m−1 K−2 at room temperature. Furthermore, with increasing Sb content, thermal conductivity values are systematically reduced due to the promotion of alloy scattering of phonons and suppression of the bipolar contribution. Consequently, these multiple approaches significantly enhance thermoelectric performance, resulting in an enhancement of thermoelectric figure-of-merit zT above 1.1 at 348–423 K. Additionally, a 〖zT〗_avg of 1.1 is recorded at 300–450 K, making it an unrivaled value among the reported n-type Mg3Bi2-based thermoelectric materials. Overall, this work demonstrates that Mg3Bi2-based materials are more promising for thermoelectric cooling applications compared to Bi2Te3-based materials.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: thermoelectric

刊行年月日: 2024-08-01

出版者: Wiley

掲載誌:

• Advanced Functional Materials (ISSN: 16163028) vol. 34 issue. 44 2407017

研究助成金:

• JST-Mirai Program JPMJMI19A1

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/adfm.202407017

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更新時刻: 2024-11-25 16:30:32 +0900

MDRでの公開時刻: 2024-11-25 16:30:32 +0900