Patent ID: 6423627
Filing Date: 2002-07-23
Classification: H01L

Abstract:
A method of integrated circuit contact opening formation, comprising:(a) forming a first insulative layer on first and second conductive line structures at a surface of a substrate; (b) forming a first opening in said first insulative layer to expose a portion of said first conductive line structure while maintaining said first insulative layer on said second conductive line structure; (c) forming a second insulative layer on said first insulative layer and on said exposed portion of said first conductive line structure; (d) masking said second insulative layer and etching using said masking to form (i) a first contact opening through said second insulative layer to said first conductive line structure at said first opening in said first insulative layer plus (ii) a second contact opening through said second insulative layer and extending to said surface adjacent said second conductive line structure and said maintained first insulative layer; (e) wherein said etching etches said second insulative layer at a higher rate than said first insulative layer.