Patent ID: 7176080

Claim:
A method of fabricating a semiconductor device including a plurality of active areas formed on a surface of a semiconductor substrate, each active area extending in a first direction and being adjacent to each other in a second direction perpendicular to the first direction, respectively, a plurality of trench capacitors disposed in ends of the active areas respectively, a plurality of gate electrodes disposed on the active areas and being adjacent to the trench capacitors of adjacent active areas in the second direction, respectively, the method comprising: forming a plurality of trenches in the active areas respectively, the trenches having sidewalls and upper openings respectively; forming a plurality of first conductive regions in the trenches so that the first conductive regions serve as electrodes of the trench capacitors respectively, each first conductive region including first impurity of a predetermined conductive type; forming sidewall insulating films on the sidewalls located over the first conductive regions respectively; forming a plurality of second conductive regions inside the sidewall insulating films respectively; removing the sidewall insulating film located the second conductive regions respectively; doping regions of the substrate located under the gate electrodes with second impurity of a reverse conduction type relative to the first impurity in the second direction from the upper openings through portions of the trenches form which the sidewall insulating films have been removed respectively; and forming a plurality of third conductive regions in said portions of the trenches.