Patent ID: 7816213

Claim:
A process of producing a semiconductor device, said process comprising: forming an isolation film on a semiconductor substrate; introducing an impurity into surfaces of a plurality of active device regions isolated by the isolation film; forming a gate-insulating film in each of the active device regions; forming a polycrystalline film on the gate-insulating film, and selectively etching the polycrystalline film to form a plurality of gate electrodes; forming source-drain regions with the polycrystalline film placed therebetween; selectively forming, on a surface of a source-drain region, an electroconductive film of a metal semiconductor compound containing an element of the polycrystalline film; forming an interlayer insulation film which covers the polycrystalline film and the electroconductive film; selectively removing the interlayer insulation film to expose an upper side of the polycrystalline film; forming a metallic film on the exposed upper side of the polycrystalline film; reacting the polycrystalline film with the metallic film under heating to form a plurality of gate electrodes of a metal semiconductor compound containing an element constituting the metallic film and an element constituting the polycrystalline film; selectively disposing a film of a same element as that constituting the polycrystalline film on a gate electrode of the plurality of gate electrodes; reacting the gate electrodes with the selectively disposed film of the element under heating, to reduce a compositional metal ratio in the gate electrodes, and selectively removing the films of the element remaining unreacted, wherein the element which constitutes the polycrystalline film comprises silicon or germanium.