Patent ID: 7989073

Claim:
An epitaxial silicon wafer in which an epitaxial layer is grown on a silicon wafer comprising a surface having a normal line MO' inclined by an inclination angle ξ from a normal line MO of a {110} plane toward an inclination angle azimuth ψ, wherein in the silicon wafer for growing the epitaxial layer thereon, the inclination angle azimuth ψ is in the range of 20 degrees or more and 30 degrees or less as measured from an <100> orientation parallel to the {110} plane toward an <110> orientation direction; the surface of the epitaxial silicon wafer has LPDs (light point defects) having a size of 65 nm or more and 100 nm or less; and the LPDs are detectable via roughness of the surface of the epitaxial silicon wafer by a laser-based surface inspection tool.