Patent ID: 8173553

Claim:
A production method of an epitaxial wafer comprising: implanting oxygen ions from a surface of a silicon wafer, and thus forming an ion-implanted layer in an area having a depth of 0.05 μm to 0.5 μm from the surface of the silicon wafer at a heating temperature of the silicon wafer of 200° C. or higher with an oxygen ion implantation amount of 1×10 15 atoms/cm 2 to 4×10 17 atoms/cm 2 ; growing a silicon epitaxial film on the surface of the silicon wafer immediately after the ion implantation at a temperature of 1,000° C. to 1,200° C. for a period of 1 to 20 minutes; and concurrently heating the wafer in the epitaxial growth, and whereby an incomplete implanted oxide film is formed from the ion-implanted layer, the incomplete implanted oxide film having a predetermined thickness and being mixedly provided with a predetermined ratio of silicon oxides consisting of SiO x including SiO 2 , and silicon particles comprising granulated silicon in the silicon wafer produced by the oxygen ion implantation, the incomplete implanted oxide film being intermittently formed in an entire area of the ion-implanted layer, and an active layer is formed on a surface side of the silicon wafer relative to the incomplete implanted oxide film.