Patent ID: 7276451
Filing Date: 2007-10-02
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device comprising the steps of: (a) forming a first interlayer insulating film on a semiconductor substrate including a landing plug poly; (b) etching the fist interlayer insulating film using a contact mask as an etching mask until the landing plug poly is exposed to form a bit line contact hole and a lower part of a storage node contact hole; (c) forming a metal layer filling up the bit line contact hole and the lower part of a storage node contact hole on the entire surface of the semiconductor substrate and-selectively etching the metal layer using a bit line mask to form a storage node contact plug while a bit line is formed; (d) forming a second interlayer insulating film on the entire surface of the metal layer; and (e) selectively etching the second insulating film using a storage node contact mask as an etching mask until the metal layer is exposed to form a storage node contact hole.