Patent ID: 7919412

Claim:
A method for forming a semiconductor chip, comprising: providing a silicon substrate, a first circuit layer over said silicon substrate, a second circuit layer over said silicon substrate and said first circuit layer, a dielectric layer between said first and second circuit layers, and a passivation layer over said silicon substrate, said first and second circuit layers and said dielectric layer, wherein said passivation layer comprises a nitride layer; forming a metal layer over said passivation layer; forming a photoresist layer on said metal layer, wherein an opening in said photoresist layer exposes a region of said metal layer; after said forming said photoresist layer, electroplating a copper layer on said region; after said electroplating said copper layer, removing said photoresist layer; after said removing said photoresist layer, removing said metal layer not under said copper layer; after said removing said metal layer not under said copper layer, forming a first polyimide layer over said copper layer; and curing said first polyimide layer with a temperature profile having a peak temperature between 200 and 320 degrees Celsius.