Patent ID: 7087474

Claim:
A method of manufacturing a semiconductor device including a field effect transistor comprising the steps of: forming a gate electrode by way of a gate insulating film above a main surface of a semiconductor substrate; ion implanting first impurities from the main surface of the semiconductor substrate to inside thereof to form a first semiconductor region that is aligned with the gate electrode; after the step of forming the gate electrode, ion implanting a group IV element to a level shallower than the implantation depth of the impurities in the step of forming the first semiconductor region from the main surface of the semiconductor substrate to inside thereof, forming a side wall spacer to the side wall of the gate electrode after forming the first semiconductor region; ion implanting second impurities to the main surface of the semiconductor substrate to form a second semiconductor region so as to be aligned with the side wall spacer, wherein the ion implantation for the group IV element is conducted to a level shallower than an implantation depth of the second impurities in the step of forming the second semiconductor region, and forming a refractory metal film on the second semiconductor region, then applying a heat treatment for reacting silicon of the second semiconductor region and the metal of the refractory metal film to form a metal semiconductor reaction layer on the second semiconductor region.