Patent ID: 6593179
Filing Date: 2003-07-15
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising a transistor and a capacitor, both being formed in a single substrate, the method comprising the steps of:forming an isolation oxide film on a silicon substrate so as to protrude from an active region of the silicon substrate by only a predetermined distance; forming a pad oxide film on the active region of the silicon substrate; forming a lower electrode of the capacitor on the isolation oxide film; forming a silicon nitride film on entire surface of the silicon substrate so as to cover the lower electrode; forming a mask on the silicon nitride film so as to cover only the area in the vicinity of the lower electrode; patterning the silicon nitride film through use of the mask by means of wet etching capable of selectively removing a silicon nitride film without recession of an upper surface of the isolation oxide film; removing the pad oxide film through wet etching capable of selectively removing silicon oxide, after patterning of the silicon nitride film; forming a gate oxide film on the active region, after removal of the pad oxide film; forming a gate electrode on the gate oxide film; and forming an upper electrode of the capacitor on the patterned silicon nitride film.