Patent ID: 8110463

Claim:
A method of fabricating a semiconductor device comprising: a first step of forming a defect suppression film suppressing increase in a defect due to implantation of an impurity on a semiconductor substrate so as to cover a surface of a gate electrode of a field-effect transistor and a surface of said semiconductor substrate where a junction transistor and said field-effect transistor are formed; a second step of forming an active region on a surface of said semiconductor substrate by implanting said impurity through said defect suppression film; a third step of removing said defect suppression film; and a fourth step of forming an interface state suppression film suppressing increase in an interface state density of said active region on said active region, wherein said defect suppression film is capable of suppressing increase in said defect as compared with said interface state suppression film, said interface state suppression film is capable of suppressing increase in said interface state density as compared with said defect suppression film, said second step includes: a step of implanting an impurity for forming a source region and a drain region of said field-effect transistor; and a step of implanting an impurity for forming any of an emitter region, a collector region, and a base region of said junction transistor, and said fourth step includes a step of forming said interface state suppression film by depositing an oxide film on said semiconductor substrate on which a gate electrode of said field-effect transistor has been formed, so as to be directly in contact with the surface of said gate electrode, said source region, and said drain region of said field-effect transistor, and, said emitter region, said collector region, and said base region of said junction transistor, respectively, and then annealing said oxide film under an oxygen atmosphere.