Patent ID: 7846809
Filing Date: 2010-12-07
Classification: H01L

Abstract:
1. A method for forming a capacitor of a semiconductor device, comprising the steps of: forming a first sacrificial insulation layer and a second sacrificial insulation layer over a semiconductor substrate which is divided into a first region and a second region; etching the second sacrificial insulation layer and the first sacrificial insulation layer in the first region to define holes in the first region of the semiconductor substrate; forming storage nodes on surfaces of the holes; etching a partial thickness of the second sacrificial insulation layer to partially expose upper portions of the storage nodes; forming a mask pattern selectively covering the first region on the etched second sacrificial insulation layer, wherein the second sacrificial insulation layer remaining in the second region is not covered by the mask pattern; removing the second sacrificial insulation layer remaining in the second region to expose the first sacrificial insulation layer in the second region; after removing the second sacrificial insulation layer remaining in the second region, removing the exposed first sacrificial insulation layer in the second region and the first sacrificial insulation layer in the first region, the second sacrificial insulation layer remaining in the first region to support an upper portion of the storage nodes; removing the mask pattern; and removing the second sacrificial insulation layer remaining in the first region.