Patent ID: 7618887
Filing Date: 2009-11-17
Classification: H01L

Abstract:
1. A method of forming a metal line in a semiconductor device, comprising: sequentially forming a first etch stop layer, a first insulation layer, and a second etch stop layer on a conductive layer; forming a first photosensitive layer pattern having a first opening on the second etch stop layer; etching the second etch stop layer by using the first photosensitive layer pattern as a mask to a degree that the first insulation layer is exposed, and then removing the first photosensitive layer pattern; sequentially forming a second insulation layer and a third etch stop layer on the first insulation layer and the etched second etch stop layer, and forming a second photosensitive layer pattern having a second opening on the third etch stop layer; etching the third etch stop layer by using the second photosensitive layer pattern as a mask to a degree that the second insulation layer is exposed, and removing the second photosensitive layer pattern; simultaneously forming an inter-connection groove and a portion of a via hole by sequentially etching the second insulation layer and only a portion of the first insulation layer using the etched third etch stop layer and the etched second etch stop layer as a mask; forming a spacer insulation layer on an entire surface of a substrate including the inter-connection groove and the portion of the via hole; forming a spacer only at both sidewalls of the inter-connection groove and both sidewalls of the portion of the via hole by performing an etch back process using the thickness of the spacer insulation layer as a target; forming the via hole by additionally etching the first insulation layer to a degree that the first etch stop layer is exposed; simultaneously forming the inter-connection groove and the via hole by removing the exposed first etch stop layer, the etched second etch stop layer, the etched third etch stop layer, and the spacer; and forming a metal line by performing a CMP process for polishing conductive materials which fill in the inter-connection groove and the via hole.