WO2004106596A1 - 炭化ケイ素単結晶並びにその製造方法及び製造装置 - Google Patents
炭化ケイ素単結晶並びにその製造方法及び製造装置 Download PDFInfo
- Publication number
- WO2004106596A1 WO2004106596A1 PCT/JP2004/007775 JP2004007775W WO2004106596A1 WO 2004106596 A1 WO2004106596 A1 WO 2004106596A1 JP 2004007775 W JP2004007775 W JP 2004007775W WO 2004106596 A1 WO2004106596 A1 WO 2004106596A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- silicon carbide
- single crystal
- carbide single
- sublimation
- producing
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/36—Carbides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/90—Carbides
- C01B32/914—Carbides of single elements
- C01B32/956—Silicon carbide
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/90—Carbides
- C01B32/914—Carbides of single elements
- C01B32/956—Silicon carbide
- C01B32/963—Preparation from compounds containing silicon
- C01B32/977—Preparation from organic compounds containing silicon
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B23/00—Single-crystal growth by condensing evaporated or sublimed materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Definitions
- the present invention relates to a silicon carbide single crystal particularly suitable as an electronic device, an optical device, and the like, and a method and an apparatus capable of efficiently producing the silicon carbide single crystal.
- Silicon carbide has a larger band gap than silicon and has excellent dielectric breakdown characteristics, heat resistance, radiation resistance, etc., so it can be used as a small, high-output electronic device material for semiconductors, etc. Due to its excellent properties, it has been attracting attention as an optical device material.
- silicon carbide single crystals have the advantage over silicon carbide polycrystals in that they are particularly excellent in uniformity of in-wafer characteristics when applied to devices such as wafers. is there.
- any of the obtained silicon carbide single crystals may be mixed with polycrystals or polymorphs or hollow pipe-shaped crystal defects ( There was a problem that a so-called micropipe would occur.
- This silicon carbide single crystal manufacturing apparatus 80 It can be attached to and detached from the reaction vessel main body 12 and the reaction vessel main body 12 that can accommodate the raw material for flower 40, and is housed in the reaction vessel main body 12 when attached to the reaction vessel main body 12.
- the silicon carbide single crystal manufacturing apparatus 80 when a current is applied to the induction heating coil 25 to heat it, the sublimation raw material 40 is heated by the heat.
- the sublimation material 40 sublimates when heated to a predetermined temperature.
- the sublimated sublimation raw material 40 does not recrystallize unless cooled to the recrystallization temperature.
- the seed crystal 50 The silicon carbide is recrystallized on top, and silicon carbide crystals grow.
- the silicon carbide single crystal 60 recrystallizes and grows on the silicon carbide single crystal seed crystal 50, and the silicon carbide single crystal The crystal 70 recrystallizes and grows.
- a concave portion 71 depressed on the lid portion 11 side is formed in a ring shape, and the vicinity of the concave portion 71 to the outer peripheral edge side of the lid portion 11 is a micro pipe. Defects such as are generated, and foreign substances such as polycrystals and polymorphs are mixed and present in a large amount.
- the entire surface of the lid portion 11 on the side facing the inside of the reaction vessel body 12 is covered with silicon carbide crystal, and polycrystalline silicon carbide 70 is provided on the outer peripheral edge of the lid portion 11.
- the silicon carbide single crystal 60 may be damaged such as a crack, or may be mixed with a polycrystal or polymorph or may have a defect such as a pipe of a mouth opening. Large Diameter Silicon Carbide In recent times when the production of crystals is required, this has become a serious problem that must be overcome.
- a high-quality silicon carbide single crystal free from damage such as cracks and the like, and free of polycrystals and polymorphs and defects such as a pipe at a mouth opening, and such a high-quality silicon carbide single crystal.
- a method and an apparatus for efficiently and easily producing a crystal having a large diameter have not yet been provided, and it is presently desired to provide them.
- Patent Documents 1 and 2 Although some techniques have been proposed as means for solving the above problems, there is still room for improvement (see, for example, Patent Documents 1 and 2).
- Patent Document 1 International Publication: WO 02/05 3 8 13 A1
- Patent Document 2 Japanese Unexamined Patent Application Publication No. 2002-620297 Disclosure of the Invention
- a sublimation substance is accommodated at a first end in a reaction vessel, and a silicon carbide single crystal seed is disposed at a second end substantially opposite to the sublimation material in the reaction vessel.
- a method is provided.
- a method for producing the above-mentioned silicon carbide single crystal, wherein the thermal S Peng coefficient of the sealing portion is substantially the same as that of the seed crystal is provided.
- the raw material for sublimation is a silicon source of at least one selected from high-purity alkoxysilane and alkoxysilane polymer, and a carbon source is a high-purity organic conjugate that generates carbon by heating.
- the mixture obtained by mixing these uniformly is 2004/007775
- the present invention provides a method for producing the above silicon carbide single crystal, which is a silicon carbide powder obtained by heating and firing in a non-oxidizing atmosphere.
- a silicon carbide single crystal production apparatus for growing a silicon carbide single crystal by recrystallizing a sublimated sublimation raw material, wherein the sublimation raw material can be accommodated.
- a lid portion detachably provided on the reaction container body; and a thermal expansion coefficient that enables a seed crystal of silicon carbide single crystal to be set up is substantially the same as that of the seed crystal.
- FIG. 1 is a schematic diagram for explaining an initial state in the method for manufacturing a silicon carbide single crystal according to the embodiment of the present invention.
- FIG. 2 is a schematic diagram for explaining a state in which a silicon carbide single crystal is manufactured by the method for manufacturing a silicon carbide single crystal according to the embodiment of the present invention.
- FIG. 3 is a schematic view of the silicon carbide single crystal of the present invention manufactured by the method for manufacturing a silicon carbide single crystal according to the embodiment of the present invention.
- FIG. 4 is a schematic explanatory view showing another example of the crucible used in the method for producing a silicon carbide single crystal according to the embodiment of the present invention.
- FIG. 5 is a schematic explanatory view showing another example of the crucible used for the method for producing a silicon carbide single crystal according to the embodiment of the present invention.
- FIG. 6 is a schematic explanatory view showing another example of the crucible used in the method for producing a silicon carbide single crystal according to the embodiment of the present invention.
- FIG. 7 is a schematic explanatory view showing another example of the crucible used in the method for producing a silicon carbide single crystal according to the embodiment of the present invention.
- FIG. 8 shows the method for producing a silicon carbide single crystal according to the embodiment of the present invention. It is a schematic explanatory drawing which shows the other example of the crucible used.
- FIG. 9 is a schematic view of a silicon carbide single crystal manufactured by a conventional method for manufacturing a silicon carbide single crystal.
- FIG. 10 is a schematic diagram for explaining a final state in the method for manufacturing a silicon carbide single crystal according to the embodiment of the present invention.
- FIG. 11 is a schematic diagram for explaining a state in which a silicon carbide single crystal is being manufactured by a conventional method for manufacturing a silicon carbide single crystal.
- An object of the present invention is to solve the above-mentioned various problems in the related art, meet the above-mentioned demands, and achieve the following objects. .
- the present invention is excellent in insulation rupture characteristics, heat resistance, radiation resistance, etc., and is particularly suitable for electronic devices such as semiconductor wafers, optical devices such as light emitting diodes, etc.
- the present inventors have found that the above problem can be solved by preventing the sublimation material from leaking from the sublimation atmosphere.
- the present inventors have found that the above problem can be solved by disposing the seed crystal on a member having the same coefficient of thermal expansion as the seed crystal.
- a sublimation raw material is accommodated in a first end of a reaction vessel. And the raw material for sublimation in the reaction vessel -6-A silicon carbide single crystal seed crystal is placed at the second end almost opposite to the above, and the sublimated material for sublimation is recrystallized on the seed crystal to grow the silicon carbide single crystal.
- a method for producing a silicon single crystal wherein a sealing portion is provided inside the reaction vessel, and leakage of a sublimated sublimation material from a sublimation atmosphere is prevented by the sealing portion.
- the present invention provides a method for producing a silicon carbide single crystal in which a silicon carbide single crystal is grown on a seed crystal.
- the thermal expansion coefficient of the sealing portion is substantially the same as that of the seed crystal, and it is more preferable that the material of the sealing portion is black bell. More preferably, the sealing portion covers a region where a single crystal can be grown in a sublimation atmosphere.
- the thermal expansion coefficient of the sealing portion By making the thermal expansion coefficient of the sealing portion approximately the same as that of the seed crystal, cracks caused by the temperature difference between the grown single crystal and the growth temperature are prevented, and the high quality large single crystal Manufacturing becomes possible. Further, by making the sealing portion cover a region where single crystal can be grown in a sublimation atmosphere, cracks caused by a temperature difference between a crucible and a growth temperature are more effectively prevented, and the above-mentioned effects are further improved. It will be. Next, regarding the above-mentioned method for producing a silicon carbide single crystal, an apparatus for producing a silicon carbide single crystal is preferred! This will be described in more detail through the description of embodiments.
- the production apparatus used for carrying out the above-mentioned method for producing a silicon carbide single crystal is not particularly limited.
- the first embodiment of the production apparatus for a silicon carbide single crystal contains a sublimation raw material.
- the crucible as the reaction vessel is not particularly limited, and may be a crucible having at least a reaction vessel main body and a lid appropriately selected from known ones and further provided with a sealing portion. Can be.
- the site for accommodating the sublimation raw material is the end opposite to the end where the seed crystal of the silicon carbide single crystal can be arranged.
- the inside of the reaction vessel has a cylindrical shape, and the axis of the cylindrical shape may be a linear shape or a curved shape, and a cross section perpendicular to the axial direction of the cylindrical shape.
- the shape may be circular or polygonal.
- Preferable examples of the circular shape include those whose axis is linear and whose cross-sectional shape perpendicular to the axial direction is circular.
- the sublimation raw material is accommodated at the first end, and the seed crystal of the silicon carbide single crystal is arranged at the second end.
- the first end portion may be referred to as a “sublimation material storage portion”, and the second end portion may be referred to as a “seed crystal disposition portion”.
- the shape of the first end portion (sublimation material accommodating portion), and the shape may be a flat surface, or a structure (for example, a convex portion or the like) for promoting soaking may be appropriately provided. Is also good.
- the second end (seed crystal disposition portion) side is designed to be detachable.
- the second end portion is designed such that a lid portion is detachable from the reaction container main body, and a sealing portion described later is arranged so as to seal a joint portion between the reaction container main body and the lid portion.
- the sealing portion is designed to be housed inside the reaction container when the lid portion is attached to the reaction container. In this case, the grown silicon carbide single crystal can be easily separated from the reaction vessel simply by 'removing the lid and the sealing part attached to the second end (seed crystal placement part). This is advantageous in that it can be performed.
- the positional relationship is not particularly limited and may be appropriately selected depending on the intended purpose.
- the positional relationship is such that the first end is a lower end and the second end is an upper end.
- the first end and the second end are located in the direction of gravity.
- the sublimation of the raw material for sublimation is performed smoothly, and the growth of the silicon carbide single crystal is performed in a state where no extra load is applied downward, that is, in the direction of gravity. Is preferred.
- a member formed of a material having excellent heat conductivity may be disposed on the first end side for the purpose of efficiently sublimating the raw material for sublimation.
- an inverted cone shape or an inverted truncated cone shape whose outer periphery can be in close contact with the peripheral side surface portion in the reaction vessel and whose inside gradually increases in diameter as approaching the second end portion. And the like are preferred.
- the portion exposed to the outside of the reaction vessel may be provided with a thread, a concave portion for temperature measurement, or the like, according to the purpose. Preferably, it is provided on at least one of the two ends.
- the material of the reaction vessel is not particularly limited and may be appropriately selected depending on the intended purpose.
- the material is preferably formed of a material having excellent durability, heat resistance, heat conductivity, and the like. It is particularly preferable that the material is made of graphite in that the mixture of polycrystals and polymorphs due to the generation of impurities is less, and the sublimation and recrystallization of the above-mentioned sublimation material are easy to control.
- the reaction vessel may be formed of a single member, or may be formed of two or more members, and can be appropriately selected depending on the purpose.
- the second end is formed of two or more members
- the second end is preferably formed of two or more members, and the center of the second end and the outer periphery thereof are separate members. It is more preferable that the temperature difference or the temperature gradient can be formed.
- the above reaction vessel grows a silicon carbide single crystal at the second end.
- a seal in which an inner region adjacent to the region where the inner region is performed and an outer peripheral region located on the outer periphery of the inner region are formed of different members, and one end of the member forming the inner region is provided in the reaction container. It is particularly preferable that the other end is exposed to the outside of the reaction vessel in contact with the reaction vessel.
- a reaction vessel having a lid composed of two or more types of members as described later with reference to FIGS. 7 and 8 in the column of Reference Examples can be used.
- the form in which the other end of the member forming the inside region is exposed to the outside of the reaction vessel is such that the inside region is a bottom surface and is continuous toward the outside of the reaction container.
- a shape in which the diameter changes discontinuously that is, a shape in which the diameter becomes large or small is given.
- Such a shape include a column shape having the inside region as a bottom surface, for example, a column shape, a prism shape, and the like, and a column shape is preferable;
- a truncated cone shape having the inside region as a bottom surface for example, a truncated cone shape, a truncated pyramid shape, an inverted truncated cone shape, an inverted truncated pyramid shape, and the like, is preferable.
- a contact portion is adhered, or a ⁇ -shaped portion is formed on one or both sides of the contact portion. It is also preferable to provide an uneven portion or the like from the viewpoint that heat radiation in the inner region is increased and silicon carbide is easily recrystallized. A similar idea is above Needless to say, this is also effective when the second end is formed of a single member.
- the surface of the inner peripheral side surface of the sealing portion at the second end is glassy carbon or amorphous carbon.
- the surface of the portion including the peripheral edge of the bottom portion where the seed crystal is placed in the sealing portion is made of the glassy carbon or amorphous carbon.
- the reaction vessel body is not particularly limited as long as it has a function of accommodating the above-mentioned sublimation raw material, and a known one can be employed.
- the lid is preferably detachable from the reaction vessel main body, and a known lid can be used.
- the reaction vessel main body and the lid may be designed to be detachable by any of fitting, screwing, and the like, but is preferably formed by screwing.
- the material of the reaction vessel body and the lid constituting the crucible as the reaction vessel is as follows.
- the sealing portion is not particularly limited as long as it is capable of installing a seed crystal of a silicon carbide single crystal and can prevent leakage of the sublimated material for sublimation. It is preferable that the material is substantially the same as the seed crystal, and it is particularly preferable that the material of the sealing portion is black bell.
- the thermal expansion coefficient of the sealing portion is 0 to
- thermal expansion coefficient in ° C is 3. 2 X 1 0- 6 ( / K) is preferably those wherein V,. With this value, the thermal expansion coefficient at 250 ° C. from the growth temperature of the single crystal is approximately the same as the thermal expansion coefficient of the seed crystal.
- the sealing portion is made of graphite, the bulk density of the graphite is preferably about 1.82 g / cm 3 .
- the above-mentioned sealing portion forms the inner peripheral side surface of the reaction vessel when the bottom for allowing the seed crystal to be installed is installed inside the reaction vessel so as to substantially face the material for sublimation.
- the sealing portion is detachable from the reaction container body.
- the material of the sealing portion is particularly preferably black.
- the sealing portion when the sealing portion is attached to the reaction vessel main body, the surface of the surface facing the sublimation raw material accommodated in the reaction vessel main body is generally formed.
- the seed crystal of the silicon carbide single crystal is arranged at the center.
- the reaction vessel is preferably surrounded by a heat insulating material or the like.
- substantially the center of the first end (sublimation raw material accommodating section) and the second end (seed crystal disposing section) of the reaction vessel is provided with the heat insulating material for the purpose of forming a temperature measuring window. It is preferable that no such information is provided.
- a graphite power member for preventing the heat insulating material powder or the like from dropping is provided. It is also preferred that it is further provided.
- reaction vessel is arranged in a quartz tube. In this case, it is preferable in that loss of heating energy for sublimation and recrystallization of the above-mentioned sublimation raw material is small.
- a high-purity product is available for the quartz tube, and using a high-purity product is advantageous in that contamination with metal impurities is reduced.
- a second embodiment of a silicon carbide single crystal manufacturing apparatus used in carrying out the above-described silicon carbide single crystal manufacturing method includes: a reaction vessel main body capable of storing a sublimation raw material; A lid detachably provided on the reaction vessel main body; and a sealing part capable of setting a seed crystal of a silicon carbide single crystal and preventing leakage of the sublimated raw material for sublimation;
- a first induction heating coil arranged in a wound state around the portion of the crucible in which the sublimation material is accommodated, and forming a sublimation atmosphere so that the sublimation material can be sublimated.
- the sublimation material sublimated by the first induction heating coil is disposed as a seed around the portion of the crucible in which the seed crystal is disposed, and is sublimated by the first induction heating coil.
- a recrystallization atmosphere is formed so that recrystallization can be performed only in the vicinity of the crystal, and the sublimation material is carbonized.
- a second induction heating coil for recrystallizing on a silicon single crystal seed crystal.
- an induction current can be further applied between the first induction heating coil (first heating means) and the second induction heating coil (second heating means).
- an interference prevention coil interference prevention means for preventing interference between the first induction heating coil and the second induction heating coil is provided. More preferably, the interference prevention coil is a coil through which cooling water can flow.
- the first induction heating coil is not particularly limited as long as it can be heated by energization to form a sublimation atmosphere so that the sublimation material can be sublimated, and a coil capable of induction heating is preferably used.
- a coil capable of induction heating is preferably used.
- the first induction heating coil is arranged so as to be wound around an outer periphery of a portion of the crucible in which the sublimation material is stored.
- the second induction heating coil forms a recrystallization atmosphere such that the sublimation material sublimated by the first induction heating coil can be recrystallized only in the vicinity of the silicon carbide seed crystal.
- the raw material can be recrystallized on the seed crystal of the above-mentioned silicon carbide, and examples thereof include a coil capable of induction heating. .
- the second induction heating coil is arranged in a state of being wound around the outer periphery of a portion of the crucible where the seed crystal of silicon carbide is arranged.
- the first induction heating coil forms a sublimation atmosphere so that the sublimation material can be sublimated, and sublimates the sublimation material.
- the second induction heating coil forms a recrystallization atmosphere such that the sublimation material sublimated by the first induction heating coil can be recrystallized only in the vicinity of the seed crystal.
- the raw material is recrystallized on the seed crystal.
- the raw material for sublimation is not particularly limited with respect to the polymorphism of the crystal, the amount used, the purity, the production method thereof, etc., as long as it is silicon carbide, and can be appropriately selected depending on the purpose.
- Examples of the polymorph of the crystal of the raw material for sublimation include 4H, 6H, 15R, and 3C, and among them, 6H and the like are preferable. These are preferably used alone, but may be used in combination of two or more.
- the amount of the sublimation raw material used can be appropriately selected according to the size of the silicon carbide single crystal to be produced, the size of the container, and the like.
- the purity of the above-mentioned sublimation raw material is preferably high from the viewpoint of preventing polycrystalline or polymorphic impurities from being mixed into the silicon carbide single crystal to be produced as much as possible. Is preferably not more than 0.5 ppm.
- the content of the impurity element is an impurity content obtained by chemical analysis, and has only a meaning as a reference value.
- the impurity element is contained in the silicon carbide single crystal.
- the evaluation differs depending on the uniformly distributed power and the locally uneven force.
- the term “impurity element” refers to a group from the 1st group in the periodic table of the revised IUPAC inorganic chemical nomenclature in 1980.
- dopant elements such as nitrogen and aluminum are intentionally added to impart ⁇ -type or ⁇ -type conductivity to the growing silicon carbide single crystal, these are also excluded.
- the silicon carbide powder as the raw material for sublimation includes, for example, at least one silicon compound as a silicon source, at least one organic compound that generates carbon by heating as a carbon source, and a polymerization catalyst or It is obtained by dissolving a crosslinking catalyst in a solvent and drying and calcining the resulting powder in a non-acidic atmosphere.
- a silicon compound and a solid compound can be used in combination, and at least one kind is selected from liquid compounds.
- alkoxysilane and alkoxysilane polymers are preferably used.
- alkoxysilane examples include methoxysilane, ethoxysilane, propoxysilane, butoxysilane, and the like. Among them, ethoxysilane is preferable in terms of handling.
- the alkoxysilane may be any of monoalkoxysilane, dialkoxysilane, trialkoxysilane, and tetraalkoxysilane, with tetraalkoxysilane being preferred.
- alkoxysilane polymer examples include a low-molecular-weight polymer (oligomer) having a degree of polymerization of about 2 to 15 and a silicate polymer.
- oligomer low-molecular-weight polymer
- silicate polymer An example is a tetraethoxysilane oligomer.
- Examples of the above solid substances include silicon oxides, silica sols (liquid containing colloidal ultrafine silicic acid, containing OH groups and alkoxyl groups inside), and silicon dioxides (silica gel, fine silica, quartz powder) and the like. Is mentioned.
- the above silicon compounds may be used alone or in combination of two or more.
- Preferred is a mixture of an oligomer of ethoxysilane, an oligomer of tetraethoxysilane and ⁇ [a mixture of powdered silica, and the like.
- the silicon compound is preferably of high purity, and preferably has an initial content of each impurity of 20 ppm or less, more preferably 5 ppm or less.
- a liquid one may be used alone, or a liquid one and a solid one may be used in combination.
- an organic compound which has a high residual carbon ratio and is polymerized or cross-linked by a catalyst or heating is preferable.
- a phenol resin, a furan resin, a polyimide, a polyurethane Preferred are resin-prepolymers of resins such as polyvinyl alcohol, and liquid substances such as cellulose, sucrose, pitch, and tar.
- resins such as polyvinyl alcohol
- liquid substances such as cellulose, sucrose, pitch, and tar.
- those having high purity are preferred, phenol resins are more preferred, and resole-type phenol resins are particularly preferred.
- the organic compound which generates carbon by heating may be used alone or in combination of two or more.
- the purity of the organic compound that produces carbon by heating can be selected as appropriate according to the purpose, but when high-purity silicon carbide powder is required, each metal should not contain more than 5 ppm It is preferable to use an organic compound.
- the polymerization catalyst and the cross-linking catalyst can be appropriately selected according to the organic compound that generates carbon by heating.
- the organic compound that generates carbon by heating is a phenol resin or a furan resin
- toluene sulfonic acid and toluene carboxylate are used.
- Acids such as acid, acetic acid, oxalic acid, maleic acid and sulfuric acid are preferred, and maleic acid is particularly preferred.
- C / Si ratio The ratio of carbon contained in the organic compound that produces carbon by the heating to silicon contained in the silicon compound (hereinafter abbreviated as “C / Si ratio”) is defined as 100% of the mixture of the two. Elemental analysis of carbide intermediate obtained by carbonization at 0 ° C Defined by Stoichiometrically, the free carbon in the silicon carbide powder obtained when the above C / S i ratio is 3.0 should be 0%. Free carbon is generated at low CZ Si ratio due to gas volatilization. It is preferable to determine the combination ratio in advance so that the amount of free carbon in the obtained silicon carbide powder becomes an appropriate amount.
- the free carbon can be suppressed by setting the CZSi ratio to 2.0 to 2.5.
- the CZSi ratio exceeds 2.5, the free carbon increases remarkably.
- the atmosphere is fired at low or high pressure, the CZSi ratio for obtaining pure silicon carbide powder fluctuates. In this case, the ratio should be limited to the above C / Si ratio. Not something.
- the silicon carbide powder can also be obtained, for example, by curing a mixture of the silicon compound and an organic compound that generates carbon by heating.
- the curing method include a method of crosslinking by heating, a method of curing with a curing catalyst, and a method of electron beam or radiation.
- the curing catalyst can be appropriately selected according to the kind of the organic compound that generates carbon by heating, and in the case of a phenol resin-furan resin, toluene sulfonic acid, toluene carboxylic acid, acetic acid, oxalic acid, Acids such as hydrochloric acid, sulfuric acid and maleic acid, and amine acids such as hexamine are preferred.
- the curing catalyst is dissolved or dispersed in a solvent.
- the catalyst include lower alcohols (for example, ethyl alcohol and the like), ethyl ether, acetone and the like.
- the silicon carbide powder obtained as described above is fired at 80 ° to 100 ° C. for 30 to 120 minutes in a non-oxidizing atmosphere such as nitrogen or argon.
- the above-mentioned firing turns the above-mentioned silicon carbide powder into a carbide.By firing the above-mentioned carbide in a non-oxidizing atmosphere such as argon at 135 to 200 ° C., a silicon carbide powder is produced. Is done.
- the firing temperature and time are determined according to the particle size of the silicon carbide powder to be obtained.
- the temperature is preferably from 160 to 190 ° C. from the viewpoint of more effective production of the silicon carbide powder.
- a heat treatment for the purpose of removing impurities and obtaining a high-purity silicon carbide powder after the above-mentioned calcination, for example, it is preferable to perform a heat treatment at 200 to 240 ° C. for 3 to 8 hours. .
- the silicon carbide powder obtained as described above has a non-uniform size, it can be made to have a desired particle size by performing pulverization, classification, and the like.
- the average particle size of the above-mentioned silicon carbide powder is preferably from 100 to 700 ⁇ m, more preferably from 100 to 400 ⁇ m.
- the silicon carbide is sublimated at a temperature of 180 ° C. (up to 270 ° C.) for growing a silicon carbide single crystal. This may cause the sublimation surface area to be small, and the growth of silicon carbide single crystal to be slowed down.Also, when the silicon carbide powder is stored in the above-mentioned reaction vessel, or for adjusting the growth rate.
- carbide Ke I containing powder is likely to scatter.
- the average particle size exceeds 5 0 0 M m, the specific surface area of the carbide Kei-containing powder itself is reduced
- the growth of silicon carbide single crystal may be slow.
- the above-mentioned silicon carbide powder may be any of 4H, 6H, 15R, 3C, a mixture thereof and the like.
- the same polymorph as the single crystal to be grown is preferable, and high purity Preferably, it is
- nitrogen or aluminum can be introduced, respectively.
- the above-mentioned silicon source, the above-mentioned carbon source, an organic substance comprising a nitrogen source or aluminum, and the above-mentioned polymerization or crosslinking catalyst may be uniformly mixed. .
- a carbon source such as a phenol resin, an organic substance consisting of a nitrogen source such as hexamethylenetetramamine, and a polymerization or cross-linking catalyst such as maleic acid
- a solvent such as ethanol
- a silicon source such as an oligomer of tetraethoxycin.
- the organic substance comprising the nitrogen source a substance that generates nitrogen by heating is preferable.
- a polymer compound specifically, a polyimide resin, a nylon resin, or the like
- an organic amine specifically, Hexamethylenetetramine, ammonia, and triethylamine, and various amines of these compounds and salts. Of these, hexamethylenetetramine is preferred.
- a phenol resin synthesized using hexamine as a catalyst and containing nitrogen derived from the synthesis process in an amount of 2.0 mm0 or more per 1 g of the resin is also suitable as an organic substance composed of the nitrogen source. Can be used.
- These organic substances composed of a nitrogen source may be used alone or in combination of two or more.
- the organic substance composed of the above aluminum source is not particularly uniform, and can be appropriately selected according to the purpose.
- the amount of the organic substance composed of the nitrogen source is preferably lmmo1 or more per 1 g of the silicon source, It is preferably from 80 to 100/2 g per 1 g of the above-mentioned calcium source.
- a sublimation raw material a high-purity alkoxysilane is used as a silicon source, a high-purity organic compound that generates carbon by heating is used as a carbon source, and a mixture obtained by uniformly mixing these is used as a non-oxidizing atmosphere. It is preferable to use a silicon carbide powder obtained by heating and baking below.
- a raw material for sublimation a polymer of high-purity alkoxysilane and high-purity alkoxysilane is used as a silicon source, and a high-purity organic compound that generates carbon by heating is used as a carbon source.
- a silicon carbide powder obtained by heating and firing a mixture obtained by mixing in a non-oxidizing atmosphere It is preferable to use a silicon carbide powder obtained by heating and firing a mixture obtained by mixing in a non-oxidizing atmosphere.
- the raw materials for sublimation include high-purity methoxysilane, high-purity ethoxysilane, high-purity propoxysilane, and high-purity butoxy.
- ⁇ 19-At least one member selected from the group consisting of xysilanes is used as a silicon source, a high-purity organic compound that generates carbon by heating is used as a carbon source, and a mixture obtained by uniformly mixing these is non-acidic. It is preferable to use a silicon carbide powder obtained by heating and baking in an atmosphere of nature.
- a raw material for sublimation at least one selected from the group consisting of high-purity methoxysilane, high-purity ethoxysilane, high-purity propoxysilane, high-purity butoxysilane, and their polymers having a degree of polymerization of 2 to 15
- a seed as a silicon source
- a high-purity organic compound that generates carbon by heating as a carbon source, and uniformly mixing these, heating the mixture under a non-oxidizing atmosphere to obtain a silicon carbide
- a powder is used.
- High-purity monoalkoxysilane and high-purity dialkoxysilane as materials for sublimation
- the sublimation of the above-mentioned sublimation raw material is performed using a heating means separate from the heating means for heating required for recrystallization, precise control of heating means, independent control, and interference prevention It is preferable from the point of view.
- the number of heating means is two or more, but two is preferable in the present embodiment.
- a heating means for forming a sublimation atmosphere capable of sublimating the sublimation raw material is a first heating means, and the sublimated sublimation raw material is in the vicinity of a seed crystal of the silicon carbide single crystal.
- the heating means for forming the recrystallization atmosphere in which only the recrystallization can be performed is the second heating means.
- the first heating means is arranged on a first end portion (sublimation material accommodating portion) side of the reaction vessel, and forms a sublimation atmosphere so that the sublimation material can be sublimated. 2004/007775
- the first heating means is not particularly limited and can be appropriately selected depending on the purpose.
- an induction heating means, a resistance heating means, etc. can be used, but the induction heating means is easy in temperature control.
- Means are preferable, and among the above-mentioned induction heating means, a coil capable of induction heating is preferable.
- the number of turns wound therewith is not particularly limited, and the heating efficiency and the temperature depend on the distance from the second heating means, the material of the anti-container, and the like. Can be determined for optimal efficiency
- the growth of the silicon carbide single crystal is performed on a seed crystal of the silicon carbide single crystal arranged on the sealing portion attached to the second end of the reaction vessel.
- the polymorphism, size, etc. of the crystal can be appropriately selected depending on the purpose. Is selected as the polymorphism of the silicon carbide single crystal.
- the temperature is set lower than the temperature at which the above-described sublimation material sublimes, and the sublimated sublimation material is re-formed only near the seed crystal. It is preferable to form a recrystallization atmosphere that enables crystallization.
- the formation of the recrystallization atmosphere can be suitably performed by the second heating means.
- a second heating means is disposed on the second end (seed crystal disposition portion) side of the reaction vessel, and the sublimation material sublimated by the first heating means is a seed crystal of a silicon carbide single crystal. Shape the recrystallization atmosphere so that recrystallization is possible only in the vicinity The sublimation material is recrystallized on the seed crystal of the silicon carbide single crystal.
- the second heating means is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include an induction heating means and a resistance heating means, but the induction heating means is easy in temperature control. It is preferable that the induction heating means be a coil capable of induction heating.
- the number of windings is not particularly limited, and the heating efficiency and the number of windings may be determined depending on the distance from the first heating means, the material of the reaction vessel, and the like.
- the amount of the induction heating current supplied to the second heating means can be determined so that the temperature efficiency is optimized.
- the amount of the induction heating current supplied to the first heating means is appropriately determined in relation to the amount of the induction heating current supplied to the first heating means.
- the relationship between the two is preferably set so that the current value of the induction heating current in the first heating means is larger than the current value of the induction heating current in the second heating means. .
- the temperature of the recrystallization atmosphere in the vicinity of the seed crystal is maintained lower than the temperature of the atmosphere in which the sublimation material is sublimated, which is advantageous in that recrystallization is easily performed.
- the amount of heating by the second heating means is controlled to be small as the silicon carbide single crystal grows, so that recrystallization is performed only in the vicinity of the silicon carbide single crystal that continues to grow, and This is advantageous in that the generation of polycrystals around the silicon single crystal is effectively suppressed.
- the current value of the induction heating current in the second heating means is controlled to be small when the diameter of the seed crystal of the silicon carbide single crystal is large, and large when the diameter is small. It tends to be preferable to control so that Since the second heating means can perform the control independently of the first heating means, the heating amount of the second heating means is appropriately adjusted according to the growth rate of the silicon carbide single crystal. Thus, a favorable growth rate can be maintained throughout the entire growth process of the silicon carbide single crystal.
- the temperature of the recrystallization atmosphere formed by the second heating means is preferably 30 to 300 ° C. lower than the temperature of the sublimation atmosphere formed by the first heating means, and 30 to 300 ° C. More preferably, it is lower by 150 ° C.
- the pressure of the recrystallization atmosphere formed by the second heating means is preferably from 10 to 100 Torr (133 to 130 Pa).
- the pressure condition instead of heating while maintaining the reduced pressure, heat to the set temperature and then reduce the pressure, and adjust the pressure condition so that it is within the above specified numerical range. Is preferred.
- the recrystallization atmosphere is preferably an inert gas atmosphere such as an argon gas.
- the temperature of the center at the second end (seed crystal placement part) side where the seed crystal of the silicon carbide single crystal is arranged, and the outer peripheral side of the reaction vessel located outside the center It is preferable to control the temperature of the adjacent portion to the following relationship from the viewpoint of obtaining a large-diameter silicon carbide single crystal.
- the silicon carbide single crystal is recrystallized and grown in the following first and second embodiments.
- a silicon carbide single crystal is grown throughout its growth process while maintaining the entire growth surface in a convex shape.
- the concave portion depressed inside the single crystal is not formed in a ring shape over the entire growth surface of the silicon carbide single crystal.
- the silicon carbide single crystal is brought into contact with the sealing portion throughout the entire growth process while maintaining the entire growth surface in a convex shape and excluding the growth surface. Grow while letting.
- a concave portion depressed inside the single crystal of the reaction vessel is not formed in a ring shape over the entire growth surface of the silicon carbide single crystal, and defects and the like are formed from portions other than the growth surface. It does not occur and diffuse.
- the sealing portion since the sealing portion has substantially the same coefficient of thermal expansion as silicon carbide, when the grown silicon carbide single crystal is cooled to room temperature, it moves from the side of the silicon carbide polycrystal to the side of the silicon carbide single crystal. The stress based on the difference in thermal expansion is not applied in a concentrated manner, and the resulting silicon carbide single crystal does not suffer from damage such as cracking.
- the entire surface of the growth surface is convex toward the growth direction, and the first end portion (sublimation material accommodating portion) and the second end portion When they face each other, it is preferable that the entire surface of the growth surface is convex toward the sublimation raw material side, that is, the first end side.
- the entire surface of the growth surface is convex toward the sublimation raw material side, that is, the first end side.
- polycrystals and polymorphs are often mixed, and stress due to a difference in thermal expansion is likely to be concentrated.
- the shape of the silicon carbide single crystal to be grown is not limited to the above-mentioned convex shape unless the entire surface of the growth surface includes a concave portion on the side opposite to the growth direction. A flat portion may be partially included.
- the shape of the silicon carbide crystal including the silicon carbide single crystal is preferably substantially mountain-like toward the above-mentioned sublimation raw material side, that is, the above-mentioned first end side, and the diameter thereof is gradually reduced. More preferably, the shape is substantially a mountain shape. In other words, it is preferable to grow a silicon carbide crystal including a silicon carbide single crystal throughout the entire growth process while maintaining a substantially mountain shape whose diameter gradually decreases as approaching the sublimation raw material side.
- polycrystalline silicon carbide and polymorphs may be mixed in the foot portion of the substantially mountain-shaped silicon carbide crystal, that is, in the outer peripheral portion, but this mixing is caused by the thickness and size of the seed crystal.
- the occurrence can be prevented by a combination of the conditions such as the shape and the amount of heating by the second heating means.
- Prevention of the above-mentioned polycrystalline silicon carbide and polymorphism is preferable because the silicon carbide crystal containing the above-mentioned silicon carbide can be composed of only a silicon carbide single crystal.
- a ring-shaped plate member may be fixedly arranged on the peripheral side surface portion in the reaction vessel substantially in parallel with the second end portion (seed crystal arrangement portion).
- the silicon carbide single crystal when the silicon carbide single crystal is recrystallized and grown on the seed crystal, only the silicon carbide single crystal can be recrystallized and grown on the seed crystal. Crystals are not generated, or they can be selectively precipitated on the ring-shaped plate member. In this case, the diameter of the obtained silicon carbide single crystal is limited by the ring-shaped plate member.
- the first heating means In order to efficiently grow the silicon carbide single crystal, the first heating means and It is preferable to use interference prevention means for preventing interference with the second heating means.
- the interference preventing means is not particularly limited and can be appropriately selected according to the type of the first heating means and the second heating means. Examples thereof include an interference prevention coil and an interference prevention plate. When the first heating means and the second heating means are coils capable of induction heating, an anti-interference coil or the like is preferably used.
- the interference prevention coil (sometimes simply referred to as “coil”) is capable of passing an induced current, and by passing the induced current, an interference between the first heating means and the second heating means is provided. It is preferable that the interference prevention coil is disposed between the first heating means and the second heating means. In this case, when induction heating by the first heating means and the second heating means is performed simultaneously, a dielectric current flows through the interference prevention coil, and the interference prevention coil minimizes and prevents interference between the two. It is preferable because it can be performed.
- the interference prevention coil is preferably designed so as not to be heated by an induced current flowing through itself, more preferably capable of cooling itself, and particularly preferably capable of flowing a cooling medium such as water. In this case, even if the induced current in the first heating means and the second heating means flows through the interference prevention coil, the interference prevention coil is not heated and does not cause damage or malfunction of peripheral parts. preferable.
- the number of windings of the interference prevention coil is not particularly limited, and differs depending on the types of the first heating means and the second heating means, the amount of current supplied to these, and the like, and is stipulated. You can't do that, but a single suffice is enough.
- a high-quality silicon carbide single crystal can be easily produced efficiently and without breakage such as cracks.
- the silicon carbide single crystal is manufactured by the method for manufacturing a silicon carbide single crystal according to the embodiment of the present invention.
- the silicon carbide single crystal preferably has a crystal defect (pipe defect) of 100 non-destructive and optically detected images, preferably no more than 100 Z cm 2 , more preferably no more than 50 cm 2. , 10 / cm 2 or less.
- the crystal defect can be detected, for example, as follows. That is, the silicon carbide single crystal was illuminated with reflection light plus an appropriate amount of transmitted illumination, and the microscope was focused on the opening of the crystal defect (pipe defect) on the surface of the silicon carbide single crystal. At this time, the entire surface of the silicon carbide single crystal is scanned under a condition that a portion leading into the inside of the pipe defect can be connected to the opening and observed as a shadow weaker than the image of the opening. After obtaining a microscope image by performing the above process, the above-mentioned microscope image is subjected to image processing, and only the characteristic shape of the above-mentioned pipe defect is extracted and the number thereof is measured, whereby the above-mentioned pipe defect can be detected.
- the above detection among the defects other than the above-mentioned pipe defects, such as foreign substances, polishing scratches, and void defects, which adhere to the surface of the above-mentioned silicon carbide single crystal, only the above-mentioned pipe defects are non-broken. Accurate detection can be performed, and even a minute pipe defect of, for example, about 0.35 Azm can be accurately detected.
- a method has been performed in which the above-mentioned pipe defect portion is selectively etched with a molten alkali, and then enlarged and detected. In this method, the adjacent pipe defects are mutually etched by etching. As a result, there is a problem that a small number of the pipe defects are detected.
- the total content of the impurity elements in the silicon carbide single crystal is 10 It is preferably at most ppm.
- the silicon carbide single crystal of the present invention is free of polycrystals and polymorphs and has no crystal defects such as micropipes, and is of extremely high quality, and thus has excellent dielectric breakdown characteristics, heat resistance, radiation resistance, etc. It is particularly suitably used for an electronic device such as an electronic device and an optical device such as a light emitting diode.
- a high-quality silicon carbide single crystal can be efficiently manufactured easily without breakage such as cracks.
- a silicon carbide single crystal was manufactured using a silicon carbide single crystal manufacturing apparatus 1 shown in FIG.
- the apparatus 1 for producing a silicon carbide single crystal is implemented, the method for producing a silicon carbide single crystal of the present invention is also implemented.
- the apparatus 1 for producing a silicon carbide single crystal comprises: a reaction vessel main body 12 capable of storing a sublimation raw material 40; a lid 11 provided detachably by screwing to the reaction vessel main body 12;
- the thermal expansion coefficient that allows the seed crystal 50 of elementary crystal to be installed is substantially the same as that of the seed crystal, and the cap 90 serving as a sealing portion for preventing the sublimation raw material 40 from leaking is used.
- the graphite crucible 10 is covered with a heat insulating material (not shown).
- the cap 90 as the above-mentioned sealing portion substantially faces the sublimation raw material 40 when provided in the reaction vessel main body 12 and has a seed crystal.
- the cap 90 has a bottom part 90a on which the base 50 can be installed, and a wall part 90b which stands upright from the peripheral edge of the bottom part and forms a hollow part together with the bottom part 90a.
- the cap 90 is held by a hinge 18 provided on the inner periphery of the inner wall of the reaction vessel main body 12, and when attached to the reaction vessel main body 12, a single crystal growth area on the peripheral side surface of the reaction vessel main body 12 is provided. It covers.
- the longitudinal distance from the lower end to the upper end of the wall portion 90b indicated by H in Fig. 1, that is, the cap height was 50 mm.
- the cap 90 has a thermal expansion coefficient definitive to 0 to 100 ° C is 3. 2X 10- 6 ⁇ / ⁇ , ) a and, bulk density, 1. 82 g
- the sublimation raw material 40 is obtained by heating and baking a mixture obtained by uniformly mixing the high-purity tetraethoxysilane polymer described above as a silicon source and a resol-type phenol resin as a carbon source under an argon atmosphere.
- the obtained silicon carbide powder (6H (including some 3C), average particle size 200 ⁇ m) was obtained.
- the seed crystal 50 of the silicon carbide single crystal was a 6H Acheson crystal having a seed crystal thickness of 0.9 mm and a diameter of 20 mm.
- the apparatus 1 for producing a silicon carbide single crystal an electric current was applied to the first induction heating coil 21 to heat it, and the sublimation raw material 40 was heated by the heat. At that time, the bottom of the reaction vessel body 12 was heated to 2540 ° C., and the pressure was maintained at 50 Torr (6645 Pa) in an argon gas atmosphere. The sublimation raw material 40 was heated to a predetermined temperature (2540 ° C) and sublimated.
- the lid 11 side is heated by the second induction heating coil 20.
- the set temperature of the lid 11 by the second induction heating coil was 2540 ° C.
- the silicon carbide single crystal 60 is recrystallized and grows on the silicon carbide single crystal seed crystal 50, and is outside the silicon carbide single crystal seed crystal 50.
- polycrystalline silicon carbide 70 is recrystallized and grows.
- the convex shape is maintained toward the sublimation raw material 40 side in the entire growth process, and the concave portion depressed on the lid portion 11 side is not formed in a ring shape, Further, the silicon carbide polycrystal 70 did not grow in a state of being in contact with the peripheral side surface portion 13 in the reaction vessel main body 12.
- the crystal defects of the micropipe were detected by cutting the obtained silicon carbide single crystal 60 to a thickness of 0.4 mm and polishing it to a wafer having a surface roughness of 0.4 nm by mirror polishing. After removing foreign matter on the surface as much as possible by washing, detection was performed as described below. That is, when the above-mentioned wafer after alkali cleaning is illuminated with reflected light and an appropriate amount of transmitted light added thereto, and the microscope is focused on the opening of the micropipe on the surface of the wafer, the wafer enters the inside of the micropipe.
- Example 1 was repeated except that the experimental conditions listed in Table 1 (seed crystal thickness, cap height, set temperatures of the first induction heating coil and the second induction heating coil) were changed. Experiments. The same results as in Example 1 were obtained. Table 1 shows the obtained results.
- Example 2 An experiment was performed in the same manner as in Example 1, except that the diameter of the seed crystal was changed from 20 mm to 50 mm.
- Example 1 As a result, a crystal was obtained in which the entire surface was a single crystal without generation of polycrystalline portions. As for the crystal defect, the same result as in Example 1 was obtained.
- the experiment was performed as in Example 4, except that the growth time was extended from 20 hours to 40 hours.
- the upper end of the silicon carbide single crystal 60 reaches the vicinity of the lower end of the sublimation raw material 40 side having the cap height H, and the silicon carbide single crystal 60 The crystal 60 grew until a portion thereof contacted the wall 90 b of the cap 90 in the reaction vessel 10. Finally, a crystal with a growth height of 3 lmm and a growth diameter of about 100 mm and a single crystal over the entire surface was obtained. Crystal defects have a center diameter of about 8 O mm The degree was almost the same as that of Example 1, but the micropipe was slightly generated in the portion of about 1 Omm in contact with the peripheral side surface.
- a silicon carbide single crystal was manufactured in the same manner as in Example 1, except that the silicon carbide single crystal manufacturing apparatus 80 shown in FIG. 10 was used.
- the cap 90 was not used as a sealing portion. Further, the first induction heating coil 21 and the second induction heating coil 20 which are arranged on the outer periphery of the quartz tube 30 and where the lid 11 of the graphite crucible 10 is located are connected to the outer periphery of the quartz tube 30.
- the interference prevention coil 22 was not used in place of the induction heating coil 25 which was spirally wound around the portion where the graphite crucible 10 was positioned at substantially equal intervals.
- Comparative Example 1 As shown in FIG. 10, the entire surface of the lid 11 facing the inside of the reaction vessel body 12 was covered with silicon carbide crystals, and the outer peripheral edge of the lid 11 was formed.
- the polycrystalline silicon carbide 70 grew at the portion in contact with the inner peripheral side surface of the reaction vessel body 12. In this state, when cooling to room temperature, stress based on the difference in thermal expansion is concentrated and applied from the silicon carbide polycrystal 70 side to the silicon carbide single crystal 60 side, as shown in FIG. 11. However, defects such as cracks occurred in the silicon carbide single crystals 6,0.
- the shape of the sealing portion in the device for manufacturing a silicon carbide single crystal is not particularly limited as long as it has the above-described function. Therefore, the manufacturing apparatuses shown in FIGS. 4 to 6 which are the same as the manufacturing apparatus shown in FIG. 1 except that the sealing portion is replaced can be used.
- the first surface at the bottom of the sealing portion is used as a material for sublimation.
- the end of the wall 91b may reach the bottom of the reaction vessel main body to support the sealing portion.
- the sealing portion may have a substantially C-shaped cross section, and may be held by a hinge portion 18 provided on the inner wall of the reaction vessel.
- the present invention has excellent dielectric breakdown characteristics, heat resistance, radiation resistance, etc., and is particularly suitable for electronic devices such as semiconductor wafers, optical devices such as light emitting diodes, etc.
- High quality silicon carbide single crystal free from defects such as pipes, and a method for efficiently and easily manufacturing the above high quality silicon carbide single crystal in a large diameter without breakage such as cracks.
- An extension device can be provided.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Recrystallisation Techniques (AREA)
- Led Devices (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04745581A EP1659198A4 (en) | 2003-05-30 | 2004-05-28 | SILICON CARBIDE MONOCRYSTAL, AND METHOD AND APPARATUS FOR PRODUCING THE SAME |
US10/558,369 US7387679B2 (en) | 2003-05-30 | 2004-05-28 | Silicon carbide single crystal and method and apparatus for producing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003154616A JP4480349B2 (ja) | 2003-05-30 | 2003-05-30 | 炭化ケイ素単結晶の製造方法及び製造装置 |
JP2003-154616 | 2003-05-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004106596A1 true WO2004106596A1 (ja) | 2004-12-09 |
Family
ID=33487324
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/007775 WO2004106596A1 (ja) | 2003-05-30 | 2004-05-28 | 炭化ケイ素単結晶並びにその製造方法及び製造装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7387679B2 (ja) |
EP (1) | EP1659198A4 (ja) |
JP (1) | JP4480349B2 (ja) |
WO (1) | WO2004106596A1 (ja) |
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1752567B1 (en) * | 2004-05-27 | 2011-09-14 | Bridgestone Corporation | Process for producing wafer of silicon carbide single-crystal |
US7314521B2 (en) | 2004-10-04 | 2008-01-01 | Cree, Inc. | Low micropipe 100 mm silicon carbide wafer |
US7387680B2 (en) * | 2005-05-13 | 2008-06-17 | Cree, Inc. | Method and apparatus for the production of silicon carbide crystals |
CN101536168A (zh) | 2006-09-14 | 2009-09-16 | 科锐有限公司 | 无微管碳化硅及其相关制备方法 |
JP4850807B2 (ja) * | 2007-10-22 | 2012-01-11 | 新日本製鐵株式会社 | 炭化珪素単結晶育成用坩堝、及びこれを用いた炭化珪素単結晶の製造方法 |
JP5250321B2 (ja) * | 2008-07-04 | 2013-07-31 | 昭和電工株式会社 | 炭化珪素単結晶成長用種結晶の製造方法並びに炭化珪素単結晶の製造方法 |
DE102008064642A1 (de) * | 2008-09-30 | 2010-04-01 | Evonik Degussa Gmbh | Zusammensetzung oder Kit für ein Verfahren zur Herstellung von hochreinem Siliciumcarbid aus Kohlenhydraten und Siliciumoxid sowie darauf basierende Artikel |
JP4985625B2 (ja) * | 2008-12-02 | 2012-07-25 | 三菱電機株式会社 | 炭化珪素単結晶の製造方法 |
JP2012066959A (ja) * | 2010-09-22 | 2012-04-05 | Bridgestone Corp | 単結晶製造装置 |
KR101365483B1 (ko) * | 2011-12-13 | 2014-02-25 | 동의대학교 산학협력단 | 단결정 성장 장치 및 방법 |
JP5839117B2 (ja) | 2012-04-20 | 2016-01-06 | トヨタ自動車株式会社 | SiC単結晶及びその製造方法 |
US8860040B2 (en) | 2012-09-11 | 2014-10-14 | Dow Corning Corporation | High voltage power semiconductor devices on SiC |
US9018639B2 (en) | 2012-10-26 | 2015-04-28 | Dow Corning Corporation | Flat SiC semiconductor substrate |
US9738991B2 (en) | 2013-02-05 | 2017-08-22 | Dow Corning Corporation | Method for growing a SiC crystal by vapor deposition onto a seed crystal provided on a supporting shelf which permits thermal expansion |
US9797064B2 (en) | 2013-02-05 | 2017-10-24 | Dow Corning Corporation | Method for growing a SiC crystal by vapor deposition onto a seed crystal provided on a support shelf which permits thermal expansion |
US9017804B2 (en) | 2013-02-05 | 2015-04-28 | Dow Corning Corporation | Method to reduce dislocations in SiC crystal growth |
US8940614B2 (en) | 2013-03-15 | 2015-01-27 | Dow Corning Corporation | SiC substrate with SiC epitaxial film |
US11091370B2 (en) | 2013-05-02 | 2021-08-17 | Pallidus, Inc. | Polysilocarb based silicon carbide materials, applications and devices |
US9657409B2 (en) | 2013-05-02 | 2017-05-23 | Melior Innovations, Inc. | High purity SiOC and SiC, methods compositions and applications |
US10322936B2 (en) | 2013-05-02 | 2019-06-18 | Pallidus, Inc. | High purity polysilocarb materials, applications and processes |
US9919972B2 (en) | 2013-05-02 | 2018-03-20 | Melior Innovations, Inc. | Pressed and self sintered polymer derived SiC materials, applications and devices |
JP5854013B2 (ja) | 2013-09-13 | 2016-02-09 | トヨタ自動車株式会社 | SiC単結晶の製造方法 |
KR102272431B1 (ko) * | 2014-06-11 | 2021-07-02 | (주)에스테크 | 탄화규소 분말, 이의 제조방법 및 탄화규소 단결정 |
DE102015212323A1 (de) | 2014-07-04 | 2016-01-07 | Sumitomo Electric Industries, Ltd. | Schmelztiegel und Verfahren zur Herstellung eines Einkristalls |
US9279192B2 (en) | 2014-07-29 | 2016-03-08 | Dow Corning Corporation | Method for manufacturing SiC wafer fit for integration with power device manufacturing technology |
RU2707772C2 (ru) * | 2014-09-25 | 2019-11-29 | Мелиор Инновейшнз, Инк. | Кремниевокарбидные материалы на основе поликарбосилоксана, варианты применения и устройства |
US10753010B2 (en) * | 2014-09-25 | 2020-08-25 | Pallidus, Inc. | Vapor deposition apparatus and techniques using high puritiy polymer derived silicon carbide |
TWI830039B (zh) * | 2020-07-27 | 2024-01-21 | 環球晶圓股份有限公司 | 碳化矽晶碇的製造方法 |
CN115491768A (zh) * | 2022-08-29 | 2022-12-20 | 浙江富芯微电子科技有限公司 | 一种籽晶粘结装置及籽晶粘结方法 |
CN117535788B (zh) * | 2024-01-10 | 2024-04-05 | 乾晶半导体(衢州)有限公司 | 一种单晶生长方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000219595A (ja) * | 1999-01-28 | 2000-08-08 | Shikusuon:Kk | 坩堝、結晶成長装置、および、結晶成長方法 |
JP2001158697A (ja) * | 1999-11-29 | 2001-06-12 | Toyota Central Res & Dev Lab Inc | 炭化珪素単結晶及びその製造方法 |
US20020083891A1 (en) * | 1999-07-20 | 2002-07-04 | Vodakov Yury Alexandrovich | Method for growing single crystal silicon carbide |
JP2002255693A (ja) * | 2000-12-28 | 2002-09-11 | Bridgestone Corp | 炭化ケイ素単結晶並びにその製造方法及び製造装置 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2747401B1 (fr) * | 1996-04-10 | 1998-05-15 | Commissariat Energie Atomique | Dispositif et procede pour la formation de carbure de silicium (sic) monocristallin sur un germe |
JP3725268B2 (ja) * | 1996-11-14 | 2005-12-07 | 株式会社豊田中央研究所 | 単結晶の製造方法 |
US5667587A (en) * | 1996-12-18 | 1997-09-16 | Northrop Gruman Corporation | Apparatus for growing silicon carbide crystals |
JP4052678B2 (ja) * | 1997-01-31 | 2008-02-27 | ノースロップ グラマン コーポレーション | 大形炭化珪素単結晶成長装置 |
US6056820A (en) * | 1998-07-10 | 2000-05-02 | Northrop Grumman Corporation | Advanced physical vapor transport method and apparatus for growing high purity single crystal silicon carbide |
EP1200650B1 (de) * | 1999-07-07 | 2003-04-09 | Siemens Aktiengesellschaft | Vorrichtung zur sublimationszüchtung eines sic-einkristalls mit folienausgekleidetem tiegel |
JP3961750B2 (ja) | 2000-08-21 | 2007-08-22 | 独立行政法人産業技術総合研究所 | 単結晶の成長装置および成長方法 |
US6863728B2 (en) * | 2001-02-14 | 2005-03-08 | The Fox Group, Inc. | Apparatus for growing low defect density silicon carbide |
JP4162923B2 (ja) * | 2001-06-22 | 2008-10-08 | 株式会社ブリヂストン | 炭化ケイ素単結晶の製造方法 |
JP4731766B2 (ja) * | 2001-09-19 | 2011-07-27 | 株式会社ブリヂストン | 炭化ケイ素単結晶及びその製造方法 |
-
2003
- 2003-05-30 JP JP2003154616A patent/JP4480349B2/ja not_active Expired - Fee Related
-
2004
- 2004-05-28 WO PCT/JP2004/007775 patent/WO2004106596A1/ja active Application Filing
- 2004-05-28 US US10/558,369 patent/US7387679B2/en not_active Expired - Fee Related
- 2004-05-28 EP EP04745581A patent/EP1659198A4/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000219595A (ja) * | 1999-01-28 | 2000-08-08 | Shikusuon:Kk | 坩堝、結晶成長装置、および、結晶成長方法 |
US20020083891A1 (en) * | 1999-07-20 | 2002-07-04 | Vodakov Yury Alexandrovich | Method for growing single crystal silicon carbide |
JP2001158697A (ja) * | 1999-11-29 | 2001-06-12 | Toyota Central Res & Dev Lab Inc | 炭化珪素単結晶及びその製造方法 |
JP2002255693A (ja) * | 2000-12-28 | 2002-09-11 | Bridgestone Corp | 炭化ケイ素単結晶並びにその製造方法及び製造装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1659198A4 * |
Also Published As
Publication number | Publication date |
---|---|
JP4480349B2 (ja) | 2010-06-16 |
JP2004352590A (ja) | 2004-12-16 |
US20070034145A1 (en) | 2007-02-15 |
US7387679B2 (en) | 2008-06-17 |
EP1659198A1 (en) | 2006-05-24 |
EP1659198A4 (en) | 2010-12-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2004106596A1 (ja) | 炭化ケイ素単結晶並びにその製造方法及び製造装置 | |
EP2574690B1 (en) | A method of producing silicon carbide single crystal | |
KR101618474B1 (ko) | SiC 에피택셜 웨이퍼 및 그 제조 방법, 및 SiC 에피택셜 웨이퍼의 제조 장치 | |
JP2018039715A (ja) | 大径炭化ケイ素単結晶及び装置、並びに、これらの製造方法 | |
JP2007204309A (ja) | 単結晶成長装置及び単結晶成長方法 | |
JP4162923B2 (ja) | 炭化ケイ素単結晶の製造方法 | |
JP2004099340A (ja) | 炭化珪素単結晶育成用種結晶と炭化珪素単結晶インゴット及びその製造方法 | |
JP2001072491A (ja) | 単結晶の製造方法およびその装置 | |
JP2010090012A (ja) | 炭化珪素単結晶の製造方法 | |
JP7258355B2 (ja) | 炭化珪素インゴットの製造方法、炭化珪素ウエハの製造方法及びその成長システム | |
JP5171571B2 (ja) | 炭化珪素単結晶の製造方法 | |
US20020189536A1 (en) | Silicon carbide single crystal and production thereof | |
JP4619567B2 (ja) | 炭化ケイ素単結晶及びその製造方法 | |
JP4708746B2 (ja) | 炭化ケイ素単結晶の製造方法及び製造装置 | |
JP4654030B2 (ja) | SiCウェハおよびその製造方法 | |
JP2007223867A (ja) | 粉体表面平坦化治具及び炭化ケイ素単結晶の製造方法 | |
JP4731766B2 (ja) | 炭化ケイ素単結晶及びその製造方法 | |
JP2009084071A (ja) | 炭化ケイ素単結晶の製造方法 | |
JP2010090013A (ja) | 炭化珪素単結晶の製造方法 | |
JP2007112661A (ja) | 炭化ケイ素単結晶の製造方法及び製造装置 | |
JP4986342B2 (ja) | 炭化ケイ素単結晶及びその製造方法 | |
JP6107308B2 (ja) | シリコン単結晶製造方法 | |
JP2012046424A (ja) | 炭化ケイ素単結晶 | |
JP2010030828A (ja) | 炭化ケイ素単結晶の製造方法および装置 | |
JP2008260665A (ja) | 炭化ケイ素単結晶の製造方法および製造装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DPEN | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed from 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2004745581 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2004745581 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007034145 Country of ref document: US Ref document number: 10558369 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 10558369 Country of ref document: US |