Patent ID: 7273780
Filing Date: 2007-09-25
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising: forming an interlayer insulating layer on a semiconductor substrate; forming buried contact plugs penetrating the interlayer insulating layer; sequentially forming a molding layer and a photoresist layer on the semiconductor substrate having the buried contact plugs formed thereon; exposing the photoresist layer using a first phase shift mask having line-and-space type patterns, to form first exposure regions; exposing the photoresist layer having the first exposure regions, using a second phase shift mask having line-and-space type patterns, to form second exposure regions intersecting the first exposure regions; developing the photoresist layer having the first and the second exposure regions, to form a photoresist pattern having rectangular-shaped openings, the rectangular-shaped openings being formed at cross points of the first and the second exposure regions; using the photoresist pattern in a process of etching the molding layer to form storage node holes exposing the buried contact plugs; and forming storage nodes inside the storage node holes.