Semiconductor device having capacitor capable of reducing additional processes and its manufacture method

摘要

A first capacitor recess and a wiring trench are formed through an interlayer insulating film. A lower electrode fills the first capacitor recess, and a first wiring fills the wiring trench. An etching stopper film and a via layer insulating film are disposed over the interlayer insulating film. A first via hole extends through the via layer insulating film and etching stopper film and reaches the first wiring, and a first plug fills the first via hole. A second capacitor recess is formed through the via layer insulating film, the second capacitor recess at least partially overlapping the lower electrode, as viewed in plan. The upper electrode covers the bottom and side surfaces of the second capacitor recess. A capacitor is constituted of the upper electrode, etching stopper film and lower electrode. A second wring connected to the first plug is formed over the via layer insulating film.

主权项

1. A semiconductor device comprising:
a first interlayer insulating film formed over a semiconductor substrate; a first capacitor recess and a wiring trench formed through the first interlayer insulating film; a lower electrode embedded in the first capacitor recess; a first wiring embedded in the wiring trench; a first etching stopper film disposed over the first interlayer insulating film; a second interlayer insulating film disposed over the first etching stopper film and made of insulating material having an etching resistance different from an etching resistance of the first etching stopper film; a first hole formed through the second interlayer insulating film and the first etching stopper film and reaching an upper surface of the first wiring; a first conductor formed in the first hole; a second capacitor recess formed through the second interlayer insulating film and reaching the first etching stopper film, the second capacitor recess at least partially overlapping the lower electrode as viewed in plan; an upper electrode including a first barrier metal film and a first conductive film, the first barrier metal film formed over a bottom surface and a side surface of the second capacitor recess and an upper surface of the via layer insulating film continuously, the first conductive film being deposited on the first barrier metal film and being continuous from a portion filing the second capacitor recess to a portion deposited on the barrier metal film covering the partial upper surface of the via layer insulating film, the upper electrode and the lower electrode constituting a capacitor comprising the first etching stopper film as a capacitor dielectric film; a second wiring formed over the second interlayer insulating film and connected to the first conductor, the second wiring including a second barrier metal film and a second conductive film, the second barrier metal film being deposited on the first conductor and made of a same material as the first barrier metal film, and the second conductive film being deposited on the second barrier metal film and made of a same material as the first conductive film; a pad formed over the second interlayer insulating film, the pad having a same lamination structure as a lamination structure of the upper electrode; a cover film formed over the second interlayer insulating film, the cover film covering the upper electrode, the second wiring and the pad; and an opening formed through the cover film, a part of the pad being exposed at a bottom of the opening.