Patent ID: 6680538
Filing Date: 2004-01-20
Classification: H01L

Abstract:
A semiconductor device comprising:a first interlevel dielectric (ILD) film having a substantially cylindrical opening having a first single diameter C; a diffusion barrier layer formed along the opening of the first ILD film; a substantially cylindrical lower plug having a second single diameter, the lower plug having a substantially cylindrical recession having a third single diameter R, the lower plug being formed in the opening coated with the diffusion barrier layer, the lower plug having a top surface; a second ILD film formed over the first ILD film and at a height greater than or equal to a height of the top surface of the plug, the second ILD film having a groove located over at least the recession of the lower plug; an adhesive layer formed on the groove of the second ILD film and the recession of the lower plug; and a conductive layer deposited on the adhesive layer to fill the groove of the second ILD film and the recession of the lower plug, the conductive layer including an upper portion and a protrusion extending vertically underneath the upper portion into the interior of the lower plug.