Patent ID: 7157330
Filing Date: 2007-01-02
Classification: H01L

Abstract:
1. A process for fabricating a semiconductor device comprising the steps of: forming a first insulation film above a base substrate; forming on the first insulation film a second insulation film having different etching characteristics from the first insulation film; forming in the second insulation film a first opening which arrives at the first insulation film; etching the first insulation film to expose a bottom of the second insulation film; forming a sidewall film on an inside wall of the first opening, the sidewall film having different etching characteristics from the first insulation film, the sidewall film having a lower end portion intruded below the second insulation film; forming on the first insulation film and the second insulation film a third insulation film having different etching characteristics from the second insulation film; selectively etching the third insulation film and the first insulation film in a region containing the region where the first opening formed, with the second insulation film and the sidewall film as an etching stopper to form a second opening in the third insulation film and to form a contact hole in the first insulation film; forming on inside walls of the second opening and in the contact hole a storage electrode electrically connected to the base substrate; and etching the third insulation film with the second insulation film as an etching stopper.