Patent ID: 7151012

Claim:
A method for fabricating a redistribution layer of a wafer, comprising steps of: providing a wafer having a conductor and a first passivation layer, the first passivation layer covering part of the wafer and exposing the surface of the conductor; forming a second passivation layer on the first passivation layer; forming an aperture relative to a pre-designed line by selectively removing part of the second passivation layer, the surface of the conductor exposed through the aperture; forming a lower metal layer in the aperture and on the second passivation layer; forming a photoresist layer on the lower metal layer; forming an opening on the photoresist layer relatively to the aperture to expose the lower metal layer in the aperture; forming a first metallic layer on the lower metal layer in the aperture; forming a upper metal layer to fill the aperture and cover on the first metallic layer, the lower metal layer and the upper metal layer constituting the second metallic layer, whereby a redistribution layer is formed in the aperture, and the redistribution layer comprises a first metal layer in the center and a second metallic layer, peripherally covering the first metallic layer and connected to the inner wall of the aperture formed by the first passivation layer, the second passivation layer, and the conductor; and forming a third passivation layer on the second passivation layer and the redistribution layer.