Patent ID: 6793902
Filing Date: 2004-09-21
Classification: C30B

Abstract:
A silicon seed crystal for a production of a silicon single crystal by the Czochralski method, comprising a boron concentration in the silicon single crystal as a matrix from which a silicon seed crystal is excised is not less than 4Ã—1018 atoms/cm3 and not more than 4Ã—1019 atoms/cm3; andsaid silicon seed crystal is excised from the silicon single crystal as the matrix, ground, and lapped, and subsequently subjected to surface etching, providing an amount to be etched of at least a part of said silicon seed crystal that is contiguous to a melt of silicon and satisfying a following formula (I), Formula IY&gE;exp(âˆ’4.96Ã—log A+18.7)â€ƒâ€ƒ(I) wherein Y denotes an amount to be etched (&mgr;m) and A denotes a size of particles (#) of a grindstone for a grinding specified in JIS (Japanese industrial standards) R 6001.