Patent ID: 7253525

Claim:
A semiconductor device comprising: a semiconductor substrate; a plurality of word lines formed on the semiconductor substrate and extended in a first direction; a first insulation film formed on the word lines and the semiconductor substrate; a plurality of bit lines formed on the first insulation film and extended in a second direction; an etching stopper film covering upper surfaces of the bit lines; a contact hole located in a part of a region between the adjacent bit lines, having ends thereof defined by the bit lines; a second insulation film which film apace between said plurality of bit lines where the contact hole is not formed and not exceeding over the etching stopper film; a sidewall insulation film, formed in the contact hole, covering a side wall of the second insulation film, side walls of the bit lines and side walls of the etching stopper film; and a capacitor having one electrode connected to the semiconductor substrate through the contact hole.