Patent ID: 7074702

Claim:
A method of manufacturing a semiconductor device, comprising: forming a first insulating layer having an opening on a semiconductor substrate, wherein the first insulating layer is formed of a first material; depositing a metal layer on the first insulating layer to sufficiently fill the opening; planarizing the metal layer to expose the first insulating layer; etching the first insulating layer to cause the surface of the metal layer to protrude from a surface of the first insulating layer, wherein the first insulating layer is etched at a depth of 50 to 200 â„«; forming a second insulating layer in contact with the exposed first insulating layer and the metal layer after etching the first insulating layer, wherein the second insulating layer is formed of a second material that is the same material as the first material; selectively etching and removing the second insulating layer to expose the metal layer; and forming a metallization layer on the metal layer.