Patent ID: 6077767
Filing Date: 2000-06-20
Classification: H01L

Abstract:
A modified implementation of air-gap low-K dielectric for unlanded via, comprising steps of:providing a substrate with a first conducting wire and a second conducting wire formed thereon, wherein a part of the substrate between the first and the second conducting wires is exposed;forming a first dielectric layer to cover the substrate, the first and the second conducting wires, wherein an air gap is formed in the first dielectric layer between the first and the second conducting wires;forming an anti-etch layer on the first dielectric layer above the air gap;forming a second dielectric layer on the anti-etch layer an the first dielectric layer;forming a via opening which exposes the first conducting wire, without removing the anti-etch layer and the first dielectric layer above the air gap even when a misalignment occurs during formation of the via opening;forming a barrier layer which covers a profile of the via opening and the exposed surface of the first conducting wire; andforming a via plug to fill the via opening.