Patent ID: 6194302
Filing Date: 2001-02-27
Classification: H01L

Abstract:
A method of fabrication of spacers on a gate structure for a self aligned contact (SAC) process; comprising the steps of:a) forming a plurality of spaced gate structures on a substrate; said gate structures having a top and sidewalls;b) forming first spacers on said sidewalls of said gate structures; said first spacers having sidewalls;c) forming a first insulating layer over said substrate; said sidewalls of said first spacers having a upper area above said first insulating layer;d) forming a dielectric layer over said gate structures, said first spacers and said first insulating layer;e) etching back said dielectric layer to form top spacers on said sidewalls of said first spacers; said top spacers having a top and a bottom; said first spacers and said top spacers form combined top spacers;f) forming a second insulating layer over said first insulating layer, said top spacers and said gate structures;g) forming a photoresist layer over said second insulating layer, said photoresist layer having a opening over said top spacers and first spacers; etching said first and second insulating layers using said photoresist layer and said top spacers as etch masks to form self aligned contact (SAC) openings;h) forming self aligned contacts (SAC) by filling said self aligned contact (SAC) openings with a conductive material.