Patent ID: 7144801

Claim:
A method of forming a plurality of bumps on a wafer having an active surface, wherein the wafer further includes a plurality of bonding pads formed on the active surface and a passivation layer formed on the active surface that exposes the bonding pads, the method comprising the steps of: forming an adhesive layer on the bonding pads and the passivation layer; forming a barrier layer above the wafer to cover the adhesive layer; removing the barrier layer to leave portions of the barrier layer disposed over the bonding pads to form a patterned barrier layer; forming a wetting layer above the wafer to cover the patterned barrier layer and the adhesive layer; forming a plurality of bumps on portions of the wetting layer located over the bonding pads; and removing the wetting layer not covered by the bumps to leave the portions of the wetting layer covered by the bumps so as to form a patterned wetting layer.