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Electroless nickel bumping of aluminium bondpads. Part 2 - electroless nickel plating

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journal contribution
posted on 22.10.2008 by David Hutt, Changqing Liu, Paul Conway, David Whalley, Samjid H. Mannan
Electroless nickel has been used for many decades to provide a hard, corrosion resistant surface finish to engineering components. In recent years its application has been extended to the electronics industry for the production of solderable surfaces on printed circuit boards, which utilize a further thin gold coating to prevent oxidation of the nickel surface. The recent interest in the use of flip-chip technology in electronics manufacture has required the development of low cost methods for solder bumping of semiconductor wafers. The electroless nickel process has been considered as a suitable candidate for the deposition of a solderable under bump metallization (UBM) layer onto the Al bondpads. However, the extension of existing electroless nickel plating processes to this new application requires greater understanding of the technique. In particular, the coating of the small isolated bondpads on the wafer surface introduces difficulties that make the use of many commercially available solutions impossible. This paper reports the results of a number of experiments carried out to investigate the electroless nickel bumping of Al bondpads and highlights the issues that need to be considered when selecting materials and techniques.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

HUTT, D. A. ...et al, 2002. Electroless nickel bumping of aluminium bondpads. Part 2 - electroless nickel plating. IEEE transactions on components and packaging technologies, 25 (1), pp. 98-105

Publication date

2002

Notes

This is a journal article. It was published in the journal IEEE transactions on components, packaging and manufacturing technologies [© IEEE], and is available from: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6144. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

ISSN

1521-3331

Language

en

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