Preparation of seed crystal from semiconductor material, contains slip zones used for drawing single crystals by Czochralski method or by zone drawing where crystal block is silicon rod of specific diameter

摘要

The preparation of a seed crystal involves: (a) preparation of a cylindrical crystal block, from a semiconductor material, containing slip zones (sic, Gleitungen) in the direction; (b) separation of a crystal piece (sic) involving the slip zones from the crystal block; (c) drilling or sawing out of the unfinished product from separated crystal piece; and (d) forming of the unfinished product. Independent claims are also included for the following: (1) a seed crystal obtained as above; and (2) a process for drawing a single crystal by the Czochralski method or by zone drawing using a seed crystal having slip zones.