Patent ID: 7858483
Filing Date: 2010-12-28
Classification: H01L

Abstract:
1. A method for fabricating a capacitor of a semiconductor device, the method comprising the steps of: forming a first insulation layer having a storage node plug over a semiconductor substrate, the storage node plug having a top surface; forming an etch stop layer and a second insulation layer sequentially over an upper surface of the first insulation layer including the top surface of the storage node plug; forming a hole exposing less than the entire top surface of the storage node plug and exposing less than the entire upper surface of the first insulation layer by selectively etching the second insulation layer using the etch stop layer; recessing a portion of the storage node plug exposed by the hole to form a recessed portion of the storage node plug, the first insulating layer that is exposed by the hole being unaffected by the formation of the recessed portion of the storage node plug such that an integrity of the first insulating layer is maintained, wherein the recessed portion of the storage node plug is provided adjacent to the exposed first insulation layer and a non-recessed portion of the storage node plug; forming a barrier metal layer on a surface of the recessed portion of the storage node plug; forming a storage node electrode connected to the storage node plug through the barrier metal layer in the hole, wherein the storage node electrode is formed over the exposed first insulating layer; and forming a dielectric layer and a metal layer for a plate electrode sequentially on the storage node electrode.