Patent ID: 6579790
Filing Date: 2003-06-17
Classification: H01L

Abstract:
A method of manufacturing a dual damascene opening in a dielectric layer above a substrate, comprising the steps of:forming a first photoresist layer over the dielectric layer, wherein the first photoresist layer has a first opening, and the first opening exposes position of the desired via opening in the dielectric layer; forming a buffer layer to cover the first photoresist layer and the first opening; forming a second photoresist layer over the buffer layer, wherein the second photoresist layer has a second opening, the second opening exposes position of a desired conductive wire trench in the dielectric layer; and etching the dielectric layer using the first photoresist layer and the second photoresist layer as a mask-to form a dual damascene opening having a via opening and a conductive wire trench in the dielectric layer.