Graphite crucible for sublimation growth of SiC crystal
First Claim
1. A graphite container and lid for use in a furnace for performing SiC crystal growth on a disk-shaped seed having a known diameter, comprising:
- a graphite cylindrical container having a sidewall and an open top configured for accepting a graphite lid;
a cylindrical shelf formed on an upper part of the sidewall and having an interior diameter smaller than the diameter of the seed, the cylindrical shelf being formed at a defined distance below the open top, thereby enabling placing and supporting the seed thereupon keeping the seed sufficiently far from the graphite lid thereby forming empty space between the seed and the graphite lid and reducing the thermal influence of the graphite lid on the seed;
the graphite lid configured for forming a closure with the open top; and
,means for preventing the seed from contacting the graphite lid.
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Accused Products
Abstract
A method of forming an SiC crystal including placing in an insulated graphite container a seed crystal of SiC, and supporting the seed crystal on a shelf, wherein cushion rings contact the seed crystal on a periphery of top and bottom surfaces of the seed crystal, and where the graphite container does not contact a side surface of the seed crystal; placing a source of Si and C atoms in the insulated graphite container, where the source of Si and C atoms is for transport to the seed crystal to grow the SiC crystal; placing the graphite container in a furnace; heating the furnace; evacuating the furnace; filling the furnace with an inert gas; and maintaining the furnace to support crystal growth to thereby form the SiC crystal.
13 Citations
19 Claims
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1. A graphite container and lid for use in a furnace for performing SiC crystal growth on a disk-shaped seed having a known diameter, comprising:
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a graphite cylindrical container having a sidewall and an open top configured for accepting a graphite lid; a cylindrical shelf formed on an upper part of the sidewall and having an interior diameter smaller than the diameter of the seed, the cylindrical shelf being formed at a defined distance below the open top, thereby enabling placing and supporting the seed thereupon keeping the seed sufficiently far from the graphite lid thereby forming empty space between the seed and the graphite lid and reducing the thermal influence of the graphite lid on the seed; the graphite lid configured for forming a closure with the open top; and
,means for preventing the seed from contacting the graphite lid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for forming an SiC crystal, the system comprising:
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a. a graphite cylindrical container having a sidewall and an open top configured for accepting a graphite lid;
a cylindrical shelf formed on an upper part of the sidewall and having an interior diameter smaller than the diameter of the seed, the cylindrical shelf being formed at a defined distance below the open top, thereby enabling placing and supporting the seed thereupon keeping the seed sufficiently far from the graphite lid thereby forming empty space between the seed and the graphite lid and reducing the thermal influence of the graphite lid on the seed; and
the graphite lid configured for forming a closure with the open top; and
, means for preventing the seed from contacting the graphite lid;b. a heater for heating an induction furnace to a temperature from 2,000°
C. to 2,500°
C.;c. a pump for evacuating the induction furnace to a pressure from 0.1 Torr to >
600 Torr; andd. gas inlet for filling the induction furnace with an inert gas. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification