Patent ID: 9607998
Date: 2017-03-28
CPC Classifications: H01L

Claim:
1. A semiconductor storage device comprising: an insulating layer; a ferroelectric capacitor on the insulating layer, the ferroelectric capacitor including a lower electrode, a ferroelectric film, and an upper electrode; an interlayer insulating film formed on the insulating layer, the interlayer insulating film having an opening at a part thereof at which the ferroelectric capacitor is disposed; a first metal plug formed in the insulating layer and connected to the lower electrode via the opening of the interlayer insulating film; a second metal plug embedded in the insulating layer outside the ferroelectric capacitor when viewed planarly; and a hydrogen barrier film covering the ferroelectric capacitor and the interlayer insulating film, wherein an upper surface of the interlayer insulating film is in a level that is higher than a level of an upper surface of the first metal plug so that a step is provided between the upper surface of the interlayer insulating film and the upper surface of the first metal plug, the lower electrode is formed on the upper surface of the interlayer insulating film, the upper surface of the first metal plug and the step, and the upper surface of the interlayer insulating film and the upper surface of the first metal plug are interlinked via a recessed portion of the interlayer insulating film.