Patent ID: 6426176
Filing Date: 2002-07-30
Classification: H01L

Abstract:
A method of forming a conductive structure on an integrated circuit substrate comprising:forming a photoresist layer over the substrate; patterning the photoresist layer to define an opening extending to a metal part on the substrate; plating a metal bump of a first material on the substrate so that the metal bump electrically contacts the metal part on the substrate, the metal bump having a stem in the opening in the photoresist layer and a head on the stem and over the photoresist layer; removing the photoresist layer to expose the stem; and plating a protective layer on the metal bump, the protective layer forming on the head and on the exposed stem, the protective layer being of a second material, wherein the first material has a first conductivity and the second material has a second conductivity which is higher than the first conductivity.