Patent ID: 8398766

Claim:
A semiconductor wafer having a front face, a rear face, and a bulk region therebetween, composed of monocrystalline silicon, containing oxygen at a concentration of from 4.4 to 5.2×10 17 atoms/cm 3 and being doped with nitrogen, wherein the concentration of nitrogen is not less than 3×10 13 atoms/cm 3 and not more than 2.5×10 14 atoms/cm 3 , comprising: an OSF region and a P v region, wherein the OSF region extends from the center of the semiconductor wafer radially toward the edge of the semiconductor wafer as far as the P v region; a BMD density in the bulk region of at least 3.5×10 8 cm −3 ; a radial distribution of the BMD density with a fluctuation range expressed by the quotient BMD max /BMD min of not more than 3, where BMD max and BMD min represent the maximum and minimum BMD density, respectively; and an OSF density of less than 10 cm −2 .