Patent ID: 9099465
Filing Date: 2015-08-04
Classification: H01L

Abstract:
1. A method, comprising: forming a first and a second metal track overlying a substrate; forming a first dielectric layer of a first dielectric material overlying the first and second metal tracks and the substrate; forming a trench having a T-shaped profile overlying the first and the second metal tracks by etching the first dielectric layer; depositing a second dielectric material after the forming of the trench and the first dielectric layer, the second dielectric material forming a fin of the second dielectric material in the center of the T-shaped trench, the fin dividing the T-shaped trench into two parts, each part defining a metal plug width; and forming first and second metal plugs by depositing a first conductive material in the first and second parts of the T-shaped trench, the first and second metal plugs being electrically isolated from each other by the fin, the first metal plug contacting the first metal track, the second metal plug contacting the second metal track, the metal plugs each having an aspect ratio of height to width that exceeds 2.5.