Patent ID: 7964491
Filing Date: 2011-06-21
Classification: H01L

Abstract:
1. A method of forming metal wirings of a nonvolatile memory device, the method comprising: forming a first insulating layer over a semiconductor substrate including a first junction area and a second junction area; forming first and second contact holes through the first insulating layer, thereby exposing the first and second junction areas, respectively; forming first and second contact plugs within the first and second contact holes; etching an exposed upper portion of the second contact plug by using a mask layer as an etching mask, thus forming a recess and a protruding portion, wherein a remaining upper portion of the second contact plug becomes the protruding portion; filling the recess, thereby forming a second insulating layer; and forming first and second metal wirings respectively coupled to the first contact plug and the protruding portion of the second contact plug, over the resultant semiconductor structure.