Patent ID: 8343618
Filing Date: 2013-01-01
Classification: C30B,Y10T

Abstract:
1. A silicon wafer having a nitrogen concentration which is from ≧5×10 14 atoms/cm 3 to ≦1×10 16 atoms/cm 3 , a carbon concentration which is from ≧1×10 15 atoms/cm 3 to ≦8.1×10 15 atoms/cm 3 , and containing BMDs having an octahedral shape, wherein BMDs located at a position below the silicon wafer surface at a depth of less than 20 μm and having a diagonal length of 200 nm or more are present in a concentration of ≦2×10 9 /cm 3 , and BMDs located at a depth of more than 50 μm from the wafer surface and having a diagonal length of ≧10 nm to ≦50 nm are present in a concentration of ≧1×10 12 /cm 3 .