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Au wire bond strength on Cu interconnects printed wiring boards was investigated for electroless Au/Pd/Ni-P pads plating prepared with knocking substrates in plating baths. A scanning electron microscope revealed that the surface of Ni-P plating formed with knocking was smoother than that of Ni-P plating formed without knocking. Furthermore, X-ray photoelectron spectroscopy indicated that no a Ni peak was recognized on Au/Pd/Ni-P plating formed with knocking, while a Ni peak was observed on ones formed without knocking. The wire bond strength to Au/Pd/Ni-P plating pads formed with knocking was larger than that to ones formed without knocking. These findings are due to removing hydrogen from a Ni-P surface by knocking substrates during formation of Ni-P plating. © The Electrochemical Society of Japan, All rights reserved.

Improvement of Wire Bond Strength to Electroless Au/Pd/Ni-P Plating Pads on Printed Wiring Boards by Knocking in Plating Bath