Effect of iodine on the corrosion of Au-Al wire bonds

Vadimas Verdingovas, Lutz Müller, Morten Stendahl Jellesen, Flemming Bjerg Grumsen, Rajan Ambat

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    Abstract

    Corrosion study was performed on Au-Al wire bonds, thin layers of sputter deposited Au and Al, and Au-Al intermetallic nuggets. The test environment was iodine-vapour in air (1. mg/L) at 85 °C with varying relative humidity, and 500 mg/L of KI in water. GDOES, XRD, SEM EDS, wire bond shear, and electrochemical testing were used to characterize the samples. Failures of Au-Al wire bonds were found to be primarily attributed to the corrosion of Al via formation of Al iodides and consequent formation of Al oxides and/or hydroxides. Most susceptible to corrosion are Al metallization and Al rich intermetallic phases.
    Original languageEnglish
    JournalCorrosion Science
    Volume97
    Pages (from-to)161-171
    ISSN0010-938X
    DOIs
    Publication statusPublished - 2015

    Keywords

    • A. Aluminium
    • A. Electronic materials
    • A. Intermetallics
    • B. Polarisation
    • B. X-ray diffraction
    • C. Interfaces

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