Patent ID: 7682971

Claim:
A method for manufacturing a semiconductor device, the method comprising: sequentially forming a gate oxide layer, a gate polysilicon layer, and a capping oxide layer on a semiconductor substrate; forming a photoresist pattern on the capping oxide layer; sequentially etching the capping oxide layer, the gate polysilicon layer, and the gate oxide layer using the photoresist pattern as an etch mask; implanting first ions into the semiconductor substrate using the photoresist pattern as an ion implantation mask; forming spacers on lateral sides of the etched capping oxide layer, the etched gate polysilicon layer, and the etched gate oxide layer; performing a thermal diffusion process on the semiconductor substrate into which the ions have been implanted to form source/drain regions; removing the capping oxide layer and portions of the spacers to expose the gate polysilicon layer; implanting second ions into the gate polysilicon layer; and depositing a first metal on the gate polysilicon layer, then forming a metal silicide from the metal and the gate polysilicon layer.