Patent ID: 8920560

Claim:
A method for manufacturing an epitaxial wafer, comprising: pulling a silicon single crystal from a boron-doped silicon melt in a chamber based on a Czochralski process; and forming an epitaxial layer on a surface of a silicon wafer sliced from the silicon single crystal; wherein the silicon single crystal is allowed to grow while passed through a temperature region of 800 to 600° C. in the chamber in 250 minutes or less and 180 minutes or more without a cooling device during the pulling; wherein the grown silicon single crystal has an oxygen concentration less than a range of 10×10 17 to 12×10 17 atoms/cm 3 (ASTMF121-1979) and a resistivity of 0.03 to 0.01 Ωcm; and wherein the silicon wafer is subjected to pre-annealing prior to the forming of the epitaxial layer on the surface of the silicon wafer, for 10 minutes to 4 hours at a predetermined temperature within a temperature region of 650 to 900° C. in an inert gas atmosphere, and BMDs generated in the wafer except for the epitaxial layer are at a density of 1×10 4 /cm 2 to 5×10 6 /cm 2 .