Abstract
Bismuth-telluride (Bi2Te3)-based compounds are common thermoelectric materials used for low-temperature applications, and nickel (Ni) is usually deposited on the Bi2Te3 substrates as a diffusion barrier. Deposition of Ni on the p-type (Sb-doped) and n-type (Se-doped) Bi2Te3 substrates using electroplating and interfacial reactions between Sn and Ni-coated Bi2Te3 substrates are investigated. Electrodeposition of Ni on different Bi2Te3 substrates is characterized based on cyclic voltammetry and Tafel measurements. Microstructural characterizations of the Ni deposition and the Sn/Ni/Bi2Te3 interfacial reactions are performed using scanning electron microscopy. A faster growth rate is observed for the Ni deposition on the n-type Bi2Te3 substrate which is attributed to a lower activation energy of reduction due to a higher density of free electrons in the n-type Bi2Te3 material. The common Ni3Sn4 phase is formed at the Sn/Ni interfaces on both the p-type and n-type Bi2Te3 substrates, while the NiTe phase is formed at a faster rate at the interface between Ni and n-type Bi2Te3 substrates.
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Acknowledgements
The authors gratefully acknowledge Dr. J.-D. Hwang from the Industrial Technology Research Institute of Taiwan for providing the TE materials. The authors gratefully acknowledge the financial support from the Ministry of Science and Technology, Taiwan (MOST-105-2221-E-005-087).
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Tseng, YC., Lee, H., Hau, N.Y. et al. Electrodeposition of Ni on Bi2Te3 and Interfacial Reaction Between Sn and Ni-Coated Bi2Te3 . J. Electron. Mater. 47, 27–34 (2018). https://doi.org/10.1007/s11664-017-5777-1
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DOI: https://doi.org/10.1007/s11664-017-5777-1