Fe-Ni-Cr diffusion barrier for high-temperature operation of Bi2Te3

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Bismuth-telluride (Bi2Te3)-based thermoelectric modules are widely used in practical applications at room temperature. However, to enable the utilization of waste heat sources, Bi2Te3-based thermoelectric modules need to operate at high efficiency levels over a medium temperature range (200–250 °C). To achieve high efficiency of Bi2Te3 modules operating at this temperature range, an optimal metallization layer should be inserted to minimize the electrical and thermal contact resistance and prevent elemental diffusion at the interface. In this work, we suggest a novel Fe-Ni-Cr layer to overcome the poor performance of the Ni layer, which is currently widely used as a metallization layer. The proposed Fe-Ni-Cr metallization resulted in a strong enough interface structure without any detachment even after thermal aging whereas the Ni-Cr metallization suffered from layer detachment problems. The specific electrical contact resistance of Fe-Ni-Cr metallization showed minor increase and remains at the ∼10−5 Ω·cm2 level after thermal aging at 250 ℃ for 100 h. The reliability of the Fe-Ni-Cr metallization layer was demonstrated with a 32-couples thermoelectric module, which showed a 5 % enhancement compared to Ni metallization thermoelectric module.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2023-01
Language
English
Article Type
Article
Citation

JOURNAL OF ALLOYS AND COMPOUNDS, v.932

ISSN
0925-8388
DOI
10.1016/j.jallcom.2022.167537
URI
http://hdl.handle.net/10203/299194
Appears in Collection
ME-Journal Papers(저널논문)
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