Patent ID: 6690093
Filing Date: 2004-02-10
Classification: H01L

Abstract:
A metal contact structure of a semiconductor device, comprising:a lower conductive layer; an interlayer dielectric film, which is formed on the lower conductive layer and in which is formed a contact hole having a bottom and a top and sidewalls and which exposes a portion of the lower conductive layer; at least one barrier metal layer formed on the bottom and the sidewalls of the contact hole, and extending beyond the width of the contact hole at the top of the contact hole; an upper conductive layer formed of a metal on the interlayer dielectric film and connected to the lower conductive layer through the contact hole; first spacers formed of an insulating material on the sidewalls of the upper conductive layer protruding above the interlayer dielectric film; second spacers formed of an insulating material on the sidewalls of the first spacers and exposed side surfaces of the barrier metal layers and whose bottoms are in contact with the interlayer dielectric film; wherein the at least one barrier metal layer that extends beyond the width of the contact hole at the top of the contact hole is aligned with the first spacers, and thus extends beyond a width of the upper conductive layer and below the first spacers.