Patent ID: 7001836
Filing Date: 2006-02-21
Classification: H01L

Abstract:
1. A method of forming an opening in a stack of insulator layers, comprising the steps of: providing a conductive structure; forming said stack of insulator layers on said conductive structure, with said stack of insulator layers comprised of a first liner layer, an overlying first insulator layer, a second liner layer, an overlying second insulator layer, an antireflective coating (ARC), layer; and a capping, third insulator layer; forming a via opening in a first portion of said stack of insulator layer, with said via opening extending downwardly from a top surface of said capping, third insulator layer and terminating in said first liner layer; forming a photoresist shape including a trench-defining shape and a photoresist plug that completely fills said via opening up to said top surface, said trench-defining shape exposing a second portion of said stack of insulator layers; forming a trench opening in said second portion of said stack of insulator layers using said trench-defining shape as an etch mask, with said trench opening extending downwardly from a top surface of said capping, third insulator layer and terminating on top surface of said second liner layer, removing a portion of said second liner layer exposed in said trench opening; removing said photoresist shape including said photoresist plug; and removing a portion of said first liner layer exposed in said via opening, exposing a portion of a top surface of said conductive structure.