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AssigneesApollon Solar, CyberStar, L.P., EFD Induction SA
InventorsRoland Einhaus, Francois C. Lissalde, Pascal Rivat
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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° C./cm and 30° C./cm in the liquid phase.
A crucible for a device for producing a block of crystalline material by directed crystallization, said crucible presenting side walls opaque to infrared radiation and a bottom transparent to infrared radiation, the bottom having, parallel to a direction substantially perpendicular to the bottom, much greater heat transfer properties than those of the side walls along said direction.
A crucible for a device for producing a block of crystalline material by directed crystallization, Presenting side walls and a bottom, the bottom and side walls are formed by plates made from the same material having anisotropic thermal conduction properties, the thermal conductivity of the plates, in the plane of the plates, being much lower than their thermal conductivity perpendicularly to this plane.
Dependencies are inferred from the claim text.