Patent ID: 6803327
Filing Date: 2004-10-12
Classification: H01L,Y10S

Abstract:
A method for forming bonding pads of a semiconductor substrate comprising the steps of:providing top level interconnecting metal for interconnecting lines and top level bond pad metal for bond pads, said top level metal being formed selectively on an insulating film overlying the main surface of a semiconductor substrate in which a desired circuit element is being formed, the surface of said insulating film being partially exposed; depositing a passivation layer over said top-level metal and over the partially exposed surface of said insulating layer, said passivation layer comprising a first and a second passivation layer; depositing a layer of photosensitive polyimide over said passivation layer, filling keyholes between closely spaced interconnect lines, preventing etching damage and damage of cracking and delamination to the surface of said passivation layer, further providing a stress buffer to said passivation layer, reducing stress impact on the passivation layer; patterning and etching said layer of photosensitive polyimide thereby forming a pattern for said bonding pads; patterning and etching said passivation layer thereby exposing said bond pad, said patterning and etching of said passivation layer to take place after said patterning and etching of said layer of photosensitive polyimide; and curing and cross-linking said photosensitive polyimide said curing and cross-linking of said photosensitive polyimide to take place after said patterning and etching of said passivation layer.