Patent ID: 7800155
Filing Date: 2010-09-21
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate; a gate insulating film formed on the semiconductor substrate; a first gate electrode formed on the gate insulating film, the first gate electrode including a first upper surface and a first side surface; a contact plug formed on the semiconductor substrate; a second gate electrode formed on the gate insulating film between the first gate electrode and the contact plug, the second gate electrode including a second upper surface and a pair of second side surfaces, the second upper surface of the second gate electrode being equal to a height of the first upper surface of the first gate electrode relative to the semiconductor substrate, either one of the second side surfaces facing to the first side surface of the first gate electrode and the other second side surface facing to the contact plug; a first silicon oxide film formed above the semiconductor substrate between the first and second gate electrodes, the first silicon oxide film including a first upper end, the first upper end having a height smaller than the height of the first upper surface of the first gate electrode relative to the semiconductor substrate; a first silicon nitride film formed along the semiconductor substrate and the other of second side surface of the second gate electrode between the contact plug and the second gate electrode, the first silicon nitride film including a second upper end, the second upper end having a smaller height smaller than the first upper surface of the first gate electrode relative to the semiconductor substrate; a second silicon oxide film formed on the first silicon oxide film, the first gate electrode and the second gate electrode, the second silicon oxide film including a third upper surface having a height greater than the height of the first upper surface of the first gate electrode relative to the semiconductor substrate; and a second silicon nitride film formed on the second silicon oxide film.