Patent ID: 8853103

Claim:
A method of manufacturing a silicon wafer doped with a predetermined concentration of nitrogen and oxygen, comprising: obtaining a heat treatment condition where an oxygen concentration is to become a critical concentration at a predetermined depth D from a surface before the silicon wafer is heat treated in a non-oxidizing atmosphere; heat treating the silicon wafer in a heat treatment condition including a higher temperature or a longer duration time (hereinafter, referred to as “high/long heat treatment”) than that of the obtained heat treatment condition; and polishing the surface to remove up to the predetermined depth D after the high/long treatment for device processing on the polished surface afterward, wherein the predetermined depth D is determined by a diffusion equation: ∂ C/∂t=D (∂ 2 C/∂x 2 ), where C=(C(x)−C0)/C1, z=x/(2×(D·t) 0.5 ), C is a concentration of oxygen, C0 is a surface oxygen concentration, C1 is a bulk oxygen concentration, D is a diffusion coefficient, and x is a distance in depth.