Conversion Efficiency Improvement of Te-Based Thermoelectric Devices through Introduction of the SnTe Alloy Barrier Layer

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2025-05-01 DOI:10.1021/acsaem.5c0073410.1021/acsaem.5c00734

Chao Wu, Xin Miao, Aojie Zhang, Mingxing Guo, Jianxiang Lin, Anjun Jin*, Wenhao Fan* and Shaoping Chen*,

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Abstract

Despite the excellent thermoelectric properties of Te, the element diffusion and reaction at the interface with the metal electrodes introduce a large contact resistivity (ρ_c), significantly reducing the conversion efficiency (η) of the device. Therefore, suitable barrier layers are being sought to optimize the connection between Te and metal electrodes. In this study, a Sn–Te alloy barrier layer is reported based on interfacial reaction. The results indicate that there is no reaction layer or microscopic defects at the interface of the SnTe/Te_0.985Sb_0.015 device. Additionally, the η of the single-leg device is approximately 4.7% at a temperature difference of 230 K. Notably, this η_max is 100% higher than that of the Ni/Te_0.985Sb_0.0₁₅/Ni device. Meanwhile, the interface exhibits good thermal stability, with no significant changes observed in ρ_c, η, and interface microstructure after aging at 523 K for 18 days. This work provides valuable insights into optimizing the interface between thermoelectric materials and metal electrodes, which could lead to the development of more efficient and stable thermoelectric devices.

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引入SnTe合金势垒层提高te基热电器件的转换效率

尽管Te具有优异的热电性能，但元素在与金属电极界面的扩散和反应会导致较大的接触电阻率（ρc），从而显著降低器件的转换效率（η）。因此，人们正在寻找合适的阻挡层来优化Te和金属电极之间的连接。本研究报道了一种基于界面反应的Sn-Te合金阻挡层。结果表明：在SnTe/Te0.985Sb0.015器件的界面处不存在反应层和微观缺陷；此外，在温差为230 K时，单腿装置的η约为4.7%。该ηmax比Ni/Te0.985Sb0.015/Ni器件的ηmax高100%。同时，界面表现出良好的热稳定性，在523 K时效18 d后，ρc、η和界面微观组织均无明显变化。这项工作为优化热电材料和金属电极之间的界面提供了有价值的见解，这可能导致开发更高效和稳定的热电器件。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.