Patent ID: 6197670
Filing Date: 2001-03-06
Classification: H01L

Abstract:
A method for forming a self-aligned contact comprising:forming a first insulating layer on a semiconductor substrate where a transistor is formed;forming a first self-aligned contact pad in said first insulating layer to be electrically connected to said semiconductor substrate outside of said transistor;forming a second insulating layer on said first insulating layer, including said first self-aligned contact pad;forming a conductive architecture on said second insulating layer, said conductive architecture being covered with a material layer having an etch selectivity with respect to said second insulating layer;forming a third insulating layer on said second insulating layer, including said conductive architecture;using a photoresist pattern and sequentially etching said third insulating layer and said second insulating layer down to a top surface of said first self-aligned contact pad, to form a first opening;forming a second self-aligned contact pad electrically connected to said first self-aligned contact pad via said first opening;forming a fourth insulating layer on said third insulating layer including said second self-aligned contact pad;etching said fourth insulating layer down to a top surface of said second self-aligned contact pad, to form a second opening; andforming a storage node electrically connected to said second self-aligned contact pad via said second opening.