Patent ID: 6921693

Claim:
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 on the second insulation film a third insulation film having different etching characteristics from the second insulation film; etching the third insulation film and the second insulation film to form a first opening which arrives at the first insulation film; etching the first insulation film and the third insulation film to expose a bottom of the second insulation film and a top of the second insulation film; forming a storage electrode on an inside wall of the first opening, the storage electrode being electrically connected to the base substrate, the storage electrode having a lower end portion intruded below the second insulation film; and etching the third insulation film with the second insulation film as an etching stopper.