Patent ID: 7550375
Filing Date: 2009-06-23
Classification: H01L,H05K

Abstract:
1. A method for forming metal bumps, comprising: providing a substrate with a plurality of pads formed thereon; forming a first photoresist on the substrate to cover the plurality of pads; conducting a planarization process to remove a portion of the first photoresist to expose the plurality of pads; forming a conductive layer on the first photoresist and the plurality of pads; electroplating a metal layer on the conductive layer; forming a patterned second photoresist on the metal layer; removing the portions of the metal layer and the conductive layer that are not covered by the patterned second photoresist by using the patterned second photoresist as a mask; removing the patterned second photoresist; and forming a solder mask on the substrate, wherein the solder mask has a plurality of openings to expose the metal layer located on the plurality of pads.