Patent ID: 6291355
Filing Date: 2001-09-18
Classification: H01L

Abstract:
A fabrication method for a self-aligned contact opening, the method comprising steps of:forming a conductive line on a substrate, wherein a nitride cap layer is formed on the conductive line, and a nitride spacer is formed on a sidewall of both the conductive line and the nitride cap layer;covering the substrate with a silicon oxide layer, and subsequently removing a part of the silicon oxide layer, so that the nitride cap layer is exposed;selectively forming a polysilicon layer on the exposed nitride cap layer and the nitride spacer;forming a photoresist layer which covers a part of the polysilicon layer and a remaining part of the silicon oxide layer;performing an etching process, with the photoresist layer serving as a principal etching mask and the polysilicon layer as a secondary mask, to form a self-aligned contact opening;removing the photoreist layer; andremoving the polysilicon layer.