Journal of Electronic Materials

, Volume 47, Issue 1, pp 27–34 | Cite as

Electrodeposition of Ni on Bi2Te3 and Interfacial Reaction Between Sn and Ni-Coated Bi2Te3

  • Yu-Chen Tseng
  • Hsuan Lee
  • Nga Yu Hau
  • Shien-Ping Feng
  • Chih-Ming Chen
Article
  • 102 Downloads

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.

Keywords

Electroplating Ni thermoelectric intermetallic compound 

Notes

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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Copyright information

© The Minerals, Metals & Materials Society 2017

Authors and Affiliations

  1. 1.Department of Chemical EngineeringNational Chung Hsing UniversityTaichungTaiwan
  2. 2.Department of Mechanical EngineeringThe University of Hong KongHong KongHong Kong

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