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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