Patent ID: 7122458
Filing Date: 2006-10-17
Classification: H01L

Abstract:
1. A method for fabricating a pad redistribution layer, comprising: providing a substrate having at least one bonding pad exposed by a first passivation layer formed thereon; conformably forming a diffusion barrier layer and a seed layer over the first passivation layer and the bonding pad; forming a patterned mask layer over the seed layer to expose a portion of the seed layer electrically connecting the bonding pad; forming a metal layer over the seed layer exposed by the patterned mask layer; forming a sacrificial layer over the metal layer and the patterned mask layer; removing the patterned mask layer and the sacrificial layer thereon to expose the seed layer thereunder such that the sacrificial layer remains over the metal layer; and removing the seed layer exposed by the metal layer, the diffusion barrier layer thereunder and the remaining sacrificial layer to leave a pad redistribution layer.