Patent ID: 7728435

Claim:
A semiconductor device, comprising: a semiconductor substrate including an active area; a gate insulating film formed on the semiconductor substrate in the active area; a gate electrode formed on the gate insulating film, the gate electrode including an upper surface and a first side surface; an insulator formed above the gate electrode; a wiring layer formed on the insulator; a contact plug formed on the semiconductor substrate in the active area and located adjacent to the gate electrode, the contact plug including a first portion having a second side surface facing to the first side surface of the gate electrode and a second portion located in the second insulator, the first portion contacted to the semiconductor substrate, the second portion having a third side surface contacted to the wiring layer; a first silicon nitride film formed between the second side surface of the contact plug and the first side surface of the gate electrode; and a second silicon nitride film formed between the upper surface of the gate electrode and the insulator, and formed above the first silicon nitride film.