Patent ID: 6153504
Filing Date: 2000-11-28
Classification: H01L,Y10S

Abstract:
A method of manufacturing a multi-metal layer semiconductor device, the method comprising:forming an uppermost metal layer over a substrate;forming a silicon oxynitride layer on the uppermost metal layer;forming a photoresist pattern on the silicon oxynitride layer;patterning the uppermost metal layer by etching to form a plurality of uppermost metal features, wherein the silicon oxynitride layer serves as an anti-reflective coating and a hard mask;depositing a topside protective dielectric layer on the patterned uppermost metal layer;etching through the topside protective dielectric layer and silicon oxynitride layer to form a bonding pad opening to an uppermost metal feature for external electrical connection; andforming a bonding pad and external electrical connection in the bonding pad opening;wherein the silicon oxynitride layer functions as both an antireflective coating and an etch stop layer in the patterning the uppermost metal layer step.