Patent ID: 7745331
Filing Date: 2010-06-29
Classification: H01L

Abstract:
1. A method for fabricating a contact plug in a semiconductor device, comprising: forming an insulation layer over a substrate, the insulation layer including a landing plug; forming an amorphous carbon layer over the insulation layer; forming a photoresist pattern over the amorphous carbon layer; etching the amorphous carbon layer and a certain thickness of the insulation layer using the photoresist pattern as an etch barrier to form an amorphous carbon hard mask and a remaining insulation layer, respectively; removing the photoresist pattern; etching the remaining insulation layer using the amorphous carbon hard mask to form a storage node contact hole exposing the landing plug; and forming a conductive material in the storage node contact hole to form a storage node contact plug, wherein an upper portion of the storage node contact hole includes a vertical profile, and a lower portion beneath the upper portion of the storage node contact hole includes a sloped profile.