Patent ID: 6426298
Filing Date: 2002-07-30
Classification: H01L

Abstract:
A method of patterning a dual damascene structure, comprising:providing a substrate; forming a first dielectric layer on said substrate; forming an etching stop layer on said first dielectric layer; forming a second dielectric layer on said etching stop layer; forming an anti-reflection layer on said second dielectric layer; forming a first photoresist layer having a first pattern on said anti-reflection layer; etching portions of said anti-reflection layer, said second dielectric layer, said etching stop layer and said first dielectric layer to form a via hole by using said first photoresist layer as a mask; removing said first photoresist layer; filling a gap-filling material on said anti-reflection layer and into said via hole; etching back said gap-filling material until said etching stop layer to expose surface of said second dielectric layer on said via hole, and therefore to form a photoresist plug disposed below said etching stop layer; forming a barrier layer; forming a second photoresist layer having a second pattern on said barrier layer; etching portions of said barrier layer to form a trench having larger lateral size than said via hole; removing said second photoresist layer; removing said barrier layer; and removing said photoresist plug to form an opening of a damascene.