Abstract
Bismuth telluride (BT) displays one of the highest thermoelectric performances between ambient temperature and 473 K. In general, although a thermoelectric material is connected to a metal electrode through soldering when thermoelectric modules are assembled, the solder components diffuse into the thermoelectric element at operating temperatures and under current stress. It is widely known that p-type bismuth telluride (p-BT) with a composition similar to that of Bi0.5Sb1.5Te3 includes a pure Te phase when the material is made using a melt growth process. Because the eutectic temperature of the pseudo-binary Bi0.5Sb1.5Te3–Te system is close to 693 K, a Te-rich liquid should be produced from p-BT at elevated temperatures above the eutectic point. It is possible for the produced liquid to be utilized as a flux to allow direct bonding between the metallic electrode material and p-BT without using solder. In this study, the reactivity between p-BT and selected metallic substrates (Cu, Ni, or 99.7 Ni–0.3 Cu (at.%)) was investigated at 773 K in an argon atmosphere, as a fundamental study of the joining process. Cu is strongly reactive to p-BT, whereas Ni has a modest reactivity against p-BT. Furthermore, the addition of a small amount of Cu to Ni drastically enhanced the diffusivity of Te in the Ni substrate. Our findings suggest that Cu addition plays a key role in controlling the reactivity, which is directly linked to the bonding strength, interfacial resistivity, and thermal stability.
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Acknowledgements
This study was conducted under the “Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials” from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT). We thank Mr. Takashi Kamaya and Mr. Toshikatsu Terui (Tohoku University) for the EPMA analyses and for creating the alloy through arc melting, respectively. We are pleased to acknowledge the financial support by Panasonic Corporation.
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Tashiro, M., Sukenaga, S., Ikemoto, K. et al. Interfacial reactions between pure Cu, Ni, and Ni–Cu alloys and p-type Bi2Te3 bulk thermoelectric material. J Mater Sci 56, 16545–16557 (2021). https://doi.org/10.1007/s10853-021-06358-3
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DOI: https://doi.org/10.1007/s10853-021-06358-3