Patent ID: 8658493

Claim:
A manufacturing method of a semiconductor device comprising: forming a ferroelectric capacitor above a semiconductor substrate; forming a first hydrogen barrier film directly on the ferroelectric capacitor; forming a first opening where a portion of an electrode of the ferroelectric capacitor is exposed in the first hydrogen barrier film; after the forming the first opening, forming a first insulating film whose surface is flat on the first hydrogen barrier film; forming a second hydrogen barrier film directly on the first insulating film; forming a second insulating film on the second hydrogen barrier film; forming a first conductive plug in contact with the semiconductor substrate through the second insulating film, the second hydrogen barrier film, and the first insulting film; forming an oxidation preventing film on the first conductive plug and the second insulating film; and forming a second conductive plug in contact with the electrode of the ferroelectric capacitor through the oxidation preventing film, the second insulating film, the second hydrogen barrier film, the first insulating film, and the first opening, wherein the manufacturing method further comprises, before the forming the ferroelectric capacitor: forming a third insulating film whose surface is flat above the semiconductor substrate; forming a third conductive plug in contact with the semiconductor substrate in the third insulating film; forming a fourth insulating film on the third insulating film and the third conductive plug; and thinning a portion of the fourth insulating film in a region above the third conductive plug contemporaneously with the time period in which the first opening is formed, and the ferroelectric capacitor is formed on the fourth insulating film.