Patent ID: 7301238
Filing Date: 2007-11-27
Classification: H01L,Y10S

Abstract:
1. An electrical connection structure, comprising: a first layer having a conductive region; an insulating layer having an aperture formed therethrough, the aperture having a lower region and an upper region, the lower region having generally parallel side walls and the upper region having sloped sidewalls, the upper region having a cross-sectional area that is larger than a cross-sectional area of the lower region by a delta value, the upper region and the lower region being self-aligned with each other; a first conductive layer having a first thickness, the first conductive layer being positioned within the aperture and in contact with the insulating layer and the conductive region of the first layer, the delta value relative to the first thickness of the first conductive layer forming a ratio; a second conductive layer within the aperture, the second conductive layer being in contact with the first conductive layer and being made of a material that protects the first conductive layer from etching, said second conductive layer within said aperture substantially filling said self-aligned upper and lower regions of said aperture so that a top surface of said second conductive layer is approximately planar with a top surface of said insulating layer; and a third conductive layer in electrical contact with the second conductive layer and overlying at least a portion of the second conductive layer.