Patent ID: 8211797
Filing Date: 2012-07-03
Classification: H01L

Abstract:
1. A metal wiring layer comprising: a substrate on which a trench is formed, a cross sectional area of the trench decreasing with increasing distance into the substrate; a dielectric layer pattern and a hole therein formed on the substrate, wherein the hole in the dielectric layer pattern is connected with the trench, and a cross sectional area of the hole decreases with increasing distance away from the substrate; and a metal layer that fills the trench and the hole in the dielectric layer pattern, wherein a cross sectional area of the metal layer decreases with increasing distance into the substrate in the trench and with increasing distance away from the substrate in the hole, the metal layer contacts a first side wall of the hole and a second side wall of the hole, and the metal layer has a uniform height from the first side wall of the hole to the second side wall of the hole.