Patent ID: 7550344
Filing Date: 2009-06-23
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor device, comprising the steps of: forming a plurality of cell-selecting transistors in a semiconductor substrate; forming bit lines, which are electrically connected with the cell-selecting transistors, over the semiconductor substrate; forming an insulative lower hydrogen-barrier film over the bit lines; forming a plurality of first contact plugs, which pass through the insulative lower hydrogen-barrier film to reach the cell-selecting transistors; selectively forming a plurality of conductive lower hydrogen-barrier films on, and in contact with, the insulative lower hydrogen-barrier film so that the conductive lower hydrogen-barrier films cover the upper faces of the first contact plugs; forming capacitor rows over the conductive lower hydrogen-barrier films, the capacitor rows including a plurality of capacitors each having a capacitive insulating film made of a ferroelectric material or a high dielectric material; and forming an upper hydrogen-barrier film over the capacitor rows, wherein the upper-hydrogen-barrier-film formation step includes the step of forming the upper hydrogen-barrier film in such a manner that the upper hydrogen-barrier film is in contact with the insulative lower hydrogen-barrier film where the insulative lower hydrogen-barrier film is located outside the capacitor rows.