Patent ID: 8454746

Claim:
A method for producing a single crystal composed of silicon from molten granules, comprising producing a first volume of molten silicon between a growing single crystal and the lower end of a conical tube of silicon, the tube closed off at a lower end thereof and enclosing a central opening of a rotating plate composed of silicon, below which the tube extends, the first volume of molten silicon produced by means of a first induction heating coil which is arranged below the plate; producing a second volume of molten silicon with the aid of a second induction heating coil which is arranged above the plate; melting the lower end of the tube to an extent such that a passage opening for the second volume of molten silicon is formed, the passage opening being produced at a point in time at which the second volume of molten silicon is not yet present or is less than double the volume of the first volume of molten silicon; and crystallizing monocrystalline silicon on the growing single crystal with consumption of molten silicon from the first and the second volumes.