Patent ID: 8035227
Filing Date: 2011-10-11
Classification: H01L

Abstract:
1. A semiconductor chip comprising: a silicon substrate; a first dielectric layer over said silicon substrate; a transistor under said first dielectric layer; a first interconnecting layer over said first dielectric layer; a second interconnecting layer over said first interconnecting layer and said first dielectric layer; a second dielectric layer between said first and second interconnecting layers; a first contact pad over said silicon substrate; a second contact pad over said silicon substrate; a passivation layer over said first and second interconnecting layers and said first and second dielectric layers, wherein said passivation layer comprises a nitride layer, wherein a first opening in said passivation layer is over a first contact point of said first contact pad, and said first contact point is at a bottom of said first opening, and wherein a second opening in said passivation layer is over a second contact point of said second contact pad, and said second contact point is at a bottom of said second opening; a polymer layer on said passivation layer, wherein a third opening in said polymer layer is over said first contact point, and wherein a fourth opening in said polymer layer is over said second contact point, wherein said polymer layer has a thickness between 2 and 50 micrometers; a third interconnecting layer on said polymer layer, on said first and second contact points and in said third and fourth openings, wherein said first contact point is connected to said second contact point through said third interconnecting layer, wherein said third interconnecting layer comprises an adhesion metal layer with a thickness between 0.01 and 3 micrometers, a copper-containing seed layer with a thickness between 0.05 and 3 micrometers over said adhesion metal layer, and an electroplated copper layer with a thickness between 2 and 100 micrometers over said copper-containing seed layer; and a metal bump on said third interconnecting layer.