Patent ID: 7294565
Filing Date: 2007-11-13
Classification: H01L

Abstract:
1. A method for forming a semiconductor structure comprising: providing a structure having at least one wire bond pad in contact with a metal line of an interconnect structure, said at least one wire bond pad having an exposed surface portion that is not protected by a passivation stack; forming a metallic cap on at least the exposed upper surface portion of the wire bond pad, said metallic cap comprises a TiN seed layer with an Al layer atop and is resistant to alkaline attack; performing a clean/pretreatment step on said Al layer; and forming Ni/Au metallization on said metallic cap, wherein said Ni/Au metallization comprises a Ni layer overlaid by an Au layer, wherein said Ni layer is formed by electroless deposition of Ni, and said Au layer is formed by immersion deposition of Au wherein said Ni/Au metallization and said metallic cap do not extend onto an upper surface of said passivation stack followed by electroless deposition of Au.