Patent ID: 9129964
Filing Date: 2015-09-08
Classification: H01L

Abstract:
1. A method comprising: forming a first metal line and a second metal line in a first interconnect level, wherein the first metal line is electrically insulated from the second metal line; forming a single via in a second interconnect level above the first interconnect level, the via is made from the same material as either the first metal line or the second metal line, and the via is in direct contact with both the first metal line and the second metal line, wherein a contact area between the via and the first metal line or a contact area between the via and the second metal line ranges from about 5% to about 25% of a total cross-sectional area of the via, the contact area and the cross-sectional area of the via being measured at a top surface of the first and second metal lines, and wherein the via has a height to width ratio greater than 1; and forming a third metal line in the second interconnect level in direct contact with the via.