Patent ID: 6124200
Filing Date: 2000-09-26
Classification: H01L

Abstract:
A method of fabricating an unlanded via adapted for use on a substrate having a metal layer formed thereon, the metal layer having an anti-reflective-coating (ARC) layer thereon, the method comprising:forming a liner dielectric layer on the ARC layer and a sidewall of the metal layer;forming an insulating material layer on the liner dielectric layer;etching back the insulating material layer so that a top surface of the insulating material layer is lower than a top surface of the ARC layer;forming a protective layer on the insulating material layer wherein the protective layer is different from the liner dielectric layer;forming an IMD layer on the protective layer;forming an opening in the IMD layer and the protective layer wherein the liner dielectric layer on the sidewall of the metal layer is thicker than that on the metal; andremoving the liner dielectric layer on the metal layer to form an unlanded via opening.