Patent ID: 7514014
Filing Date: 2009-04-07
Classification: H01L

Abstract:
1. A method for forming conducting structures separated by gaps on a substrate comprising: providing a substrate and a wiring line layer above the substrate; providing a conductive layer on the wiring line layer; forming a cap layer directly on the conductive layer, wherein the cap layer has a particular thickness to create destructive interference and the cap layer has a composition adapted to provide a graded index of refraction between said conductive layer and a photoresist layer during a photolithographic process, the photoresist layer being formed on top of the cap layer; etching through a portion of the cap layer and portions of the conductive layer and wiring line layer to form wiring lines separated by gaps, the wiring lines having a remaining portion of the cap layer thereon; and depositing a dielectric material on surfaces exposed by the etching process including exposed surfaces of the cap layer to substantially fill the gaps between the wiring lines, said dielectric material including a layer formed by high density plasma chemical vapor deposition, wherein the cap layer acts to protect the wiring lines and portions of the cap layer are sacrificially removed during the process of depositing the dielectric material.