Patent ID: 6300238
Filing Date: 2001-10-09
Classification: H01L

Abstract:
A fabrication method for a node contact opening which electrically couples a capacitor and a substrate, the method comprising the steps of:forming a first insulating layer on the substrate, wherein a bit line which contacts the substrate is formed on the first insulating layer;forming a conformal second insulating layer which covers the bit line and the first insulating layer; wherein the second insulating layer and the first insulating layer have different etching rates;forming a third insulating layer on the second insulating layer;forming a pattern mask on the third insulating layer, wherein the pattern mask has a thickness of about 100-200 .ANG.;performing an etching step, wherein a pattern of the pattern mask is transferred into the third insulating layer, with the second insulating layer serving as an etching stop layer, so that an opening is formed in the third insulating layer;removing the second insulating layer in the opening with the pattern mask serving as an etching mask;forming a spacer on a sidewall of the opening; andetching the first insulating layer, with the pattern mask and the spacer serving as etching masks, so that the opening is extended to expose the substrate to form a node contact opening.