Patent ID: 8101508

Claim:
A method of manufacturing a first silicon substrate, comprising: a preparation step of growing a single crystal silicon that is doped with phosphorus (P) and has a carbon concentration that is greater than or equal to 1.0×10 16 atoms/cm 3 and less than or equal to 1.0×10 17 atoms/cm 3 and an initial oxygen concentration that is greater than or equal to 1.4×10 18 atoms/cm 3 and less than or equal to 1.6×10 18 atoms/cm 3 using a CZ method, and slicing the single crystal silicon; a step of forming an n+ epitaxial layer that is doped with phosphorus (P) at a concentration greater than or equal to 1.0×10 19 atoms/cm 3 on the sliced single crystal silicon; and a step of forming a n epitaxial layer that is doped with phosphorus (P) at a concentration greater than or equal to 1.0×10 16 atoms/cm 3 and less than or equal to 1.0×10 18 atoms/cm 3 on the n+ epitaxial layer, wherein the thickness of the n+ epitaxial layer is greater than or equal to 0.2 μm and less than or equal to 0.6 μm, and the thickness of the n epitaxial layer is greater than or equal to 2 μm and less than or equal to 10 μm.