Abstract
The ZnSb intermetallic compound may have thermoelectric applications because it is low in cost and environmentally friendly. In this study, a Zn4Sb3 thermoelectric element coated with a Ni barrier layer and a Ag reaction layer was bonded with a Ag-coated Cu electrode using a Ag/Sn/Ag solid–liquid interdiffusion bonding process. The results indicated that a Ni5Zn21 intermetallic phase formed easily at the Zn4Sb3/Ni interface, leading to sound adhesion. In addition, Sn film was found to react completely with the Ag layer to form a Ag3Sn intermetallic layer having a melting point of 480°C. The resulting Zn4Sb3 thermoelectric module can be applied at the optimized operation temperature (400°C) of Zn4Sb3 material as a thermoelectric element. The bonding strengths ranged from 14.9 MPa to 25.0 MPa, and shear tests revealed that the Zn4Sb3/Cu-joints fractured through the interior of the thermoelectric elements.
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Acknowledgements
The authors are grateful for the financial support of this study by the Ministry of Science and Technology, Taiwan, under Grant No. NSC 102-2221-E-002-057-MY3, and by the Industrial Technology Research Institute, under Grant No. 104-S-A28.
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Lin, Y.C., Lee, K.T., Hwang, J.D. et al. Solid Liquid Interdiffusion Bonding of Zn4Sb3 Thermoelectric Material with Cu Electrode. J. Electron. Mater. 45, 4935–4942 (2016). https://doi.org/10.1007/s11664-016-4645-8
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DOI: https://doi.org/10.1007/s11664-016-4645-8