Patent ID: 6191042
Filing Date: 2001-02-20
Classification: H01L

Abstract:
A method of forming a node contact opening, which is suitable for a substrate having a dielectric layer formed thereon, comprising the steps of:performing a first etching step on the dielectric layer to form an opening, wherein a polymer layer is formed on a sidewall of the opening during the first etching step, and wherein the first etching step comprises using an etchant comprising C.sub.4 F.sub.8, Ar and CH.sub.2 F.sub.2 so as to form the polymer layer during the first etching step; andperforming a second etching step with the polymer layer on the sidewall of the opening used as a mask, wherein the dielectric layer exposed by the polymer layer is etched until the substrate is exposed so as to form a node contact opening.