Apollon Solar

Cyberstar

Efd Induction Sa

Siltronix

Roland Einhaus

Francois Claude Lissalde

Pascal Rivat

Hubert Lauvray

Maxime Forster

Erwann Fourmond

Jacky Stadler

François Lissalde

A feedstock of semiconductor material is placed in a crucible. A closed sacrificial recipient containing a dopant material is placed in the crucible. The content of the crucible is melted resulting in incorporation of the dopant in the molten material bath. The temperature increase is performed under a reduced pressure.

Method for doping a semiconductor material

A temperature gradient is established in a crystallization crucible by means of a heat source and a cooling system. The cooling system comprises a heat exchanger and an adjustable additional heat source. The cooling system is preferably formed by an induction coil cooled by a coolant liquid circulating in the induction coil and by an electrically conductive induction susceptor positioned between the crucible and induction coil. The fabrication process comprises heating the crucible via the top and controlling heat extraction from the crucible downwards by means of the heat exchanger and by means of regulation of the adjustable additional heat source.

Device and process for producing a block of crystalline material

The bottom of the crucible has much greater thermal transfer properties, parallel to an axis substantially perpendicular to the bottom, than those of the side walls. The bottom and side walls are formed by materials having the same main chemical constituents. The bottom can be transparent to infrared radiation and the side walls opaque to infrared radiation. The bottom can be made of amorphous silica and the side walls of opaque quartz ceramic. The crucible can also be made of graphite. The device can comprise a graphite felt, arranged between the bottom of the crucible and cooling means, and compression means of the graphite felt. It is thus possible to define a temperature gradient comprised between 8&#xb0; C./cm and 30&#xb0; C./cm in the liquid phase.

Crucible for a device for producing a block of crystalline material and method for producing same

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Bourgoin Jallieu, France

Roland Einhaus