Patent ID: 6214719
Filing Date: 2001-04-10
Classification: H01L

Abstract:
A method for establishing a low dielectric constant material between metal lines in a damascene scheme, comprising the steps of:a) providing a polished substrate;b) depositing a first dielectric layer on said substrate at a predetermined height and having a top surface;c) patterning and etching said first dielectric layer to form lines;d) depositing a second dielectric layer between the first dielectric layer lines and forming air gaps in said second dielectric layer, said air gaps formed below said predetermined height;e) polishing said second dielectric layer until the top surface of said first dielectric layer lines are exposed, while leaving lines of said second dielectric layer therebetween;f) etching and removing said first dielectric layer; and,g) depositing metal at said predetermined height and between said second dielectric layer lines.