Patent ID: 7112523

Claim:
A method of forming a plurality of bumps on a wafer having an active surface, wherein the wafer further comprises a plurality of bonding pads formed on the active surface and a passivation layer formed on the active surface to expose the bonding pads, the method comprising the sequential steps of: forming an adhesive layer over the active surface of the wafer, wherein the adhesive layer covers the bonding pads and the passivation layer; removing only portions of the adhesive layer not covering the bonding pads to form a patterned adhesive layer; forming a barrier layer above the patterned adhesive layer and the passivation layer; forming a wetting layer on the barrier layer; removing portions of the wetting layer not disposed above the bonding pads to form a patterned wetting layer; and removing portions of the barrier layer not covered by the patterned wetting layer to form a patterned layer.