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Elimination of Au-embrittlement in solder joints on Au/Ni metallization

  • M.O. Alam (a1), Y.C. Chan (a1) and K.N. Tu (a2)
  • DOI: http://dx.doi.org/10.1557/JMR.2004.0170
  • Published online: 01 March 2011
Abstract

Systematic experimental work was carried out to understand the mechanism of Au diffusion to the solder interface, and a novel method was proposed to eliminate Au embrittlement by circumventing the continuous layer of (Au,Ni)Sn4 at the solder interface. Contrary to the usual expectation, it was determined that utilization of a very thin Ni metallization in the Au/Ni/Cu under bump metallization (UBM) was an effective means of maintaining mechanical integrity of the solder joint. It was found that the out-diffusion of Cu during the aging period changes the chemistry and morphology of the intermetallic compounds at the interface.

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a)Address all correspondence to this author.e-mail: EEYCCHAN@cityu.edu.hk
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