Production of semiconductor single crystals

摘要

The production of single crystals of semiconductor material comprises producing a melt in an ampoule by melting solid starting material and optionally dopants. The melt is subjected to a combined magnetic field before and during crystal growth. The magnetic field consists of a rotating and a static magnetic field. Also claimed is an apparatus for carrying out the above process comprising: (a) a housing (1) with an ampoule (2) containing the starting material; (b) a heating system (4) producing the temperature profile necessary for crystal growth; (c) a mechanism or control for the relative movement between ampoule and temperature profile; and (d) a combined magnet system (9) arranged around the housing consisting of two inductors (13,14) for the rotating (11) and static (10) magnetic fields.