Patent ID: 9305996
Filing Date: 2016-04-05
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a semiconductor substrate; a first insulating film formed on the semiconductor substrate; an etching stopper film formed on the first insulating film; a second insulating film formed on the etching stopper film; a first plug, that is connected to the semiconductor substrate, formed in the first insulating film, the etching stopper film and the second insulating film; a capacitor formed on the second insulating film; a third insulating film formed on the second insulating film and the capacitor; and a second plug, that is connected to the first plug, formed in the third insulating film, wherein: the first plug includes a first part located in the first insulating film and the etching stopper film; the first plug includes a second part located only in the second insulating film; and a diameter of the second part is larger than a diameter of the first part.