Patent ID: 6890824

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: forming a gate electrode on a semiconductor substrate; forming low concentration impurity regions by performing ion implantation on said semiconductor substrate by using said gate electrode as a mask; depositing a first insulating film over said semiconductor substrate in which said low concentration impurity regions are formed; forming first sidewall insulating films on the side surfaces of said gate electrode by performing anisotropic dry etching on said first insulating film; forming high concentration impurity regions by performing ion implantation on said semiconductor substrate by using said gate electrode and said first sidewall insulating films as a mask; depositing a second insulating film over said semiconductor substrate in which said high concentration impurity regions are formed; forming second sidewall insulating films on the portions of said high concentration impurity regions located in proximity to said low concentration impurity regions and on the side surfaces of said first sidewall insulating films by performing anisotropic dry etching on said second insulating film; and selectively forming metal silicide layers on the exposed region of each surface of said semiconductor substrate and said gate electrode by using said first sidewall insulating films and said second sidewall insulating films as a mask.