Patent ID: 7045448

Claim:
A semiconductor device fabrication method, comprising: forming a gate electrode on a substrate via a gate insulating film by using a silicon-containing material; depositing an insulating material on the gate electrode and the substrate, and etching back the insulating material, thereby forming a first insulating film so as to expose a surface of the substrate, and cover surfaces of the gate electrode; ion-implanting an impurity by using the gate electrode and the first insulating film as masks, thereby selectively forming a diffusion layer in a surface portion of the substrate; forming a first metal film on at least the substrate, and allowing the first metal film to react with the substrate by annealing, thereby forming a silicide film in a surface portion of the diffusion layer; forming a second insulating film so as to cover the gate electrode, which is covered with the first insulating film, and the substrate; forming a third insulating film as an interlayer insulating film on the second insulating film; planarizing the first, second, and third insulating films to a height at which upper surfaces of the gate electrode are exposed; removing the third insulating film such that a predetermined selectivity to the second insulating film is obtained; forming a second metal film on at least the gate electrode, and allowing the second metal film to react with the gate electrode by annealing, thereby converting the material of the gate electrode into a metal silicide; forming a fourth insulating film so as to cover the gate electrode and second insulating film; forming a fifth insulating film as an interlayer insulating film on the fourth insulating film; planarizing the fifth insulating film; processing the fifth insulating film into a shape of a desired contact pattern such that a predetermined selectivity to the fourth insulating film is obtained; selectively removing the fourth and second insulating films present on a bottom surface of the contact pattern of the fifth insulating film; and forming a contact by burying a conductive material in the contact pattern of the fifth insulating film.