Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 46, Issue 7, Pages 4384-4391Publisher
SPRINGER
DOI: 10.1007/s11664-017-5355-6
Keywords
Palladium-coated copper wire; flash gold layer; wire bonding; sulfidation
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Funding
- Instrument Center of National Cheng Kung University
- National Science Council of Taiwan [MOST 105-2628-E-006-001-MY2]
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Palladium-coated copper wire with flash gold (PCA) is a fine wire with an oxidation resistance layer. A new sulfidation test has been assessed in this work, confirming that PCA wires show better sulfidation corrosion resistance than either palladium-coated or bare copper wires. The sulfided surface of PCA was analyzed, along with its bonding strength and electrical properties. The metallurgic mechanism for formation of free air balls during the electric flame-off (EFO) process was identified. The flash gold layer of PCA wires can improve certain shortcomings, including: (1) efficiently promoting sulfidation corrosion resistance, (2) solving the problem of palladium segregation during the EFO process, (3) reducing the starting voltage, and (4) stabilizing the electrical resistivity of the bonding interface.
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