Patent ID: 7091121

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 steps of: forming a first dielectric layer above the active surface of the wafer, wherein the first dielectric layer has a plurality of first openings and second openings exposing the bonding pads and portions of the passivation layer respectively; forming a first electrically conductive layer over the first dielectric layer, the bonding pads and the portions of passivation layer exposed out of the first dielectric layer through the second openings; removing portions of the first electrically conductive layer covering the first dielectric layer to form a patterned first electrically conductive layer; forming a second electrically conductive layer above the patterned first electrically conductive layer and the first dielectric layer, wherein the second electrically conductive layer is made of a material selected from one of nickel-vanadium, nickel, chromium-copper and nickel-titanium; removing portions of the second electrically conductive layer which do not cover the patterned first electrically conductive layer to expose the first dielectric layer so as to form a patterned second electrically conductive layer; and forming a second dielectric layer above the first dielectric layer and the patterned second electrically conductive layer and exposing portions of the patterned second electrically conductive layer disposed above the second openings, wherein the portions of the patterned second electrically conductive layer exposed through the second openings are regarded as bump pads, and the bump pads are electrically connected to the bonding pads through the patterned first electrically conductive layer and the patterned second electrically conductive layer.