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標題: Solid-state interfacial reactions at the solder joints employing Au/Pd/Ni and Au/Ni as the surface finish metallizations
作者: Lin, C.P.
Chen, C.M.
關鍵字: intermetallic compound formation;sn-ag-cu;black pad;wire bonds;au;couples;growth;palladium;substrate;behavior
Project: Microelectronics Reliability
期刊/報告no:: Microelectronics Reliability, Volume 52, Issue 2, Page(s) 385-390.
A tri-layer of nickel/palladium/gold (Au/Pd/Ni) is a promising candidate to replace the conventional Au/Ni bi-layer as the surface finish metallization for lead-free packaging. A surface finish metallization (Au/Pd/Ni or Au/Ni) and a Sn layer are sequentially deposited on a Cu substrate and then are subjected to thermal aging at 150 and 200 degrees C to investigate the interfacial reactions in the stacking multilayer structure made by low-temperature solid-state bonding. Because of the absence of the reflow process, the Pd and Au layers do not dissolve in the Sn matrix but remain at the interface and participate in the interfacial reaction to form the (Pd,Ni,Au)Sn-4 and (Au,Ni)Sn-4 phases at the Au/Pd/Ni- and Au/Ni-based interfaces, respectively. Though the Pd layer was only 0.4 mu m, its resulting (Pd,Ni,Au)Sn-4 phase is much thicker than the (Au,Ni)Sn-4 phase. These two intermetallic compounds exhibit very different microstructural evolution which significantly affects the interfacial microstructures and growth rate of other intermetallic compound formed at the same interfaces. (C) 2011 Elsevier Ltd. All rights reserved.
ISSN: 0026-2714
DOI: 10.1016/j.microrel.2011.03.007
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