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Abstract

A manufacturing method of an epitaxial silicon wafer uses a silicon wafer containing phosphorus, having a resistivity of less than 1.0 mΩ·cm. The silicon wafer has a main surface to which a (100) plane is inclined and a [100] axis that is perpendicular to the (100) plane and inclined at an angle ranging from 0°5′ to 0°25′ with respect to an axis orthogonal to the main surface. The manufacturing method includes: annealing the silicon wafer at a temperature from 1200 degrees C. to 1220 degrees C. for 30 minutes or more under argon gas atmosphere (argon-annealing step); etching a surface of the silicon wafer (prebaking step); and growing the epitaxial film at a growth temperature ranging from 1100 degrees C. to 1165 degrees C. on the surface of the silicon wafer (epitaxial film growth step).

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First Claim