Patent ID: 6916732
Filing Date: 2005-07-12
Classification: H01L

Abstract:
1. A method of forming a plurality of bumps on a silicon wafer having an active surface, wherein the wafer further includes a plurality of contact pads distributed over the active surface and a passivation layer over the active surface that exposes the contact pads, the method comprising the steps of: forming an adhesion layer over the active surface of the wafer, wherein the adhesion layer covers both the contact pads and the passivation layer; forming at least one metallic layer over the adhesion layer; patterning the adhesion layer and the metallic layer so that a residual portion of the adhesion layer and a residual portion of the metallic layer are formed over each contact pad; forming a photoresist layer over the active surface of the wafer, wherein the photoresist layer has a plurality of openings that expose the metallic layer; filling the openings with a flux material; disposing a solder block into each opening; conducting a reflow process so that the solder blocks are bonded to the metallic layer; and removing the flux material and the photoresist layer.