Intermixing reactions in electrodeposited Cu/Sn and Cu/Ni/Sn multilayer interconnects during room temperature and high temperature aging

Chia, P.Y. and Haseeb, A.S. Md. Abdul (2015) Intermixing reactions in electrodeposited Cu/Sn and Cu/Ni/Sn multilayer interconnects during room temperature and high temperature aging. Journal of Materials Science: Materials in Electronics, 26 (1). pp. 294-299. ISSN 0957-4522, DOI https://doi.org/10.1007/s10854-014-2398-9.

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Abstract

Current push for miniaturization and 3D packaging makes it important to understand reactions in interconnects with ultra small volume. In order to reduce processing time and to have more homogeneous interconnects, solder can be designed in a multilayer form with components layer thickness in the sub-micron or even nanometer range. In this work, reaction kinetics in multilayer interconnects consisting stacks of Cu/Sn/Cu and Cu/Ni/Sn/Ni/Sn deposited by electrodeposition were investigated at room temperature and 150 A degrees C. The progress of the reaction in the multilayers was monitored by using XRD, SEM and EDX. Results show that by inserting a 70 nm thick nickel layer between copper and tin, premature reaction between Cu and Sn at room temperature can be avoided. The addition of the nickel layers also allows the selective formation of Cu6Sn5 which is considered to have better properties compared to Cu3Sn. Details of the reaction sequence and mechanisms are discussed.

Item Type:	Article
Funders:	High Impact Research (HIR) Grant, University of Malaya UM.C/625/1/HIR/MOHE/ENG/26 , Postgraduate Research Grant, University of Malaya PG031-2012B
Additional Information:	Ay6td Times Cited:0 Cited References Count:19
Uncontrolled Keywords:	Lead-free solder, cu-sn, intermetallic compounds, ni addition, growth, diffusion, alloys,
Subjects:	T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Engineering
Depositing User:	Mr Jenal S
Date Deposited:	04 Aug 2015 02:15
Last Modified:	16 Apr 2019 02:52
URI:	http://eprints.um.edu.my/id/eprint/13857

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