Effect of Pd-P Layer on the Bonding Strength of Bi-Te Thermoelectric Elements

In this study, the effect of electroless Pd-P plating on the bonding strength of the Bi-Te thermoelectric elements was investigated. The bonding strength was approximately doubled by electroless Pd-P plating. Brittle Sn-Te intermetallic compounds were formed on the bonding interface of the thermoele...

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Veröffentlicht in:Archives of metallurgy and materials 2019-01, Vol.64 (3), p.963-968
Hauptverfasser: Bae, Sung Hwa, Han, Se Hun, Son, Injoon, Kim, Kyung Tae
Format: Artikel
Sprache:eng
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Zusammenfassung:In this study, the effect of electroless Pd-P plating on the bonding strength of the Bi-Te thermoelectric elements was investigated. The bonding strength was approximately doubled by electroless Pd-P plating. Brittle Sn-Te intermetallic compounds were formed on the bonding interface of the thermoelectric elements without electroless Pd-P plating, and the fracture of the bond originated from these intermetallic compounds. A Pd-Sn solder reaction layer with a thickness of approximately 20 µm was formed under the Pd-P plating layer in the case of the electroless Pd-P plating, and prevented the diffusion of Bi and Te. In addition, the fracture did not occur on the bonding interface but in the thermoelectric elements for the electroless Pd-P plating because the bonding strength of the Pd-Sn reaction layer was higher than the shear strength of the thermoelectric elements.
ISSN:1733-3490
2300-1909
DOI:10.24425/amm.2019.129481