WO2014017648A1 - 坩堝、結晶成長装置および結晶成長方法 - Google Patents
坩堝、結晶成長装置および結晶成長方法 Download PDFInfo
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- WO2014017648A1 WO2014017648A1 PCT/JP2013/070369 JP2013070369W WO2014017648A1 WO 2014017648 A1 WO2014017648 A1 WO 2014017648A1 JP 2013070369 W JP2013070369 W JP 2013070369W WO 2014017648 A1 WO2014017648 A1 WO 2014017648A1
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- solution
- crucible
- seed crystal
- crystal
- hole
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- 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
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
- C30B15/10—Crucibles or containers for supporting the melt
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1032—Seed pulling
- Y10T117/1052—Seed pulling including a sectioned crucible [e.g., double crucible, baffle]
Definitions
- the present invention relates to a crucible provided with a solution adjusting member, a crystal growth apparatus using the crucible, and a crystal growth method for growing crystals using the crucible.
- silicon carbide As a crystal currently attracting attention, there is silicon carbide (SiC) which is a compound of carbon and silicon. Silicon carbide has a wider band gap than silicon, has a high electric field strength that leads to dielectric breakdown (good withstand voltage characteristics), high thermal conductivity, high heat resistance, and excellent chemical resistance. It attracts attention from various advantages such as excellent radiation resistance and attention in a wide range of fields such as heavy electricity including nuclear power, transportation including automobiles and aviation, and home appliances.
- the silicon carbide crystal can be grown on the surface of the seed crystal by, for example, a solution growth method or a sublimation method. A method for growing a silicon carbide crystal by a solution growth method is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-264790.
- the present invention has been devised in view of such circumstances, and an object thereof is to provide a crucible capable of increasing the crystal growth rate, a crystal growth apparatus using the crucible, and a crystal growth method. To do.
- a crucible according to an embodiment of the present invention accommodates a silicon-containing solution in the interior thereof, contacts the lower surface of the seed crystal with the solution from above, and then pulls up the seed crystal.
- a crystal growth apparatus includes the above-described crucible and a holding member that holds the seed crystal and can put or pull the seed crystal from the opening of the crucible.
- the crystal growth method includes the above-described crucible, a holding member that holds the seed crystal and can put the seed crystal into and out of the opening of the crucible, and an upper surface of the holding member.
- the present invention when a silicon carbide crystal is grown by the solution growth method, a convection containing a large amount of carbon is easily applied to the lower surface of the seed crystal in the solution inside the crucible, and the crystal grows on the lower surface of the seed crystal. There is an effect that the growth rate of the crystal can be increased.
- FIG. 4 is an enlarged cross-sectional view of the crucible and the holding member shown in FIG. 1 and corresponds to a cross section taken along the line A-A ′ of FIG. 3. It is a top view when the crucible shown in FIG. 1 and FIG. 2 is seen through a plane.
- FIG. 2 is a cross-sectional view schematically showing convection generated when a crystal is grown on the lower surface of a seed crystal by a solution growth method in the crucible shown in FIG. 1.
- FIG. 4 is a cross-sectional view illustrating one step of the crystal growth method according to the embodiment of the present invention, and corresponds to a cross section taken along the line A-A ′ of FIG. 3.
- FIG. 4 is a cross-sectional view illustrating one step of the crystal growth method according to the embodiment of the present invention, and corresponds to a cross section taken along the line A-A ′ of FIG. 3.
- FIG. 4 is a cross-sectional view illustrating one step of the crystal growth method according to the embodiment of the present invention, and corresponds to a cross section taken along the line A-A ′ of FIG. 3.
- FIG. 4 is a cross-sectional view illustrating one step of the crystal growth method according to the embodiment of the present invention, and corresponds to a cross section taken along the line A-A ′ of FIG. 3.
- FIG. 1 is a cross-sectional view schematically showing a crystal growth apparatus according to this embodiment, and shows an outline of the crystal growth apparatus.
- FIG. 2 is an enlarged view of a part of a longitudinal section obtained by cutting the crucible and the holding member according to the present embodiment in the vertical direction, and shows the structure of the crucible and the holding member.
- FIG. 3 shows the upper surface of the crucible according to the present embodiment excluding the solution, and shows the shape of the crucible and the solution adjusting member.
- FIG. 4 shows an example of the state of convection in the crucible 1 according to this embodiment.
- the crucible 1 contains a silicon-containing solution 2 containing carbon, contacts the lower surface 3B of the seed crystal 3 with the solution 2 from above, and then pulls the seed crystal 3 up, This is used for a solution growth method in which a silicon carbide crystal 3 ′ is grown from the solution 2 on the lower surface 3 B of the seed crystal 3.
- the crucible 1 is a seed disposed on the upper side, which is fixed to the inner wall surface 1A so as to be positioned between the bottom surface 1B of the crucible 1 and the liquid surface 2A of the solution 2 when the solution 2 is stored in the crucible 1.
- a solution adjusting member 4 having a through hole 4 a overlapping the inside of the crystal 3 is provided.
- the crucible 1 of this embodiment is used by being mounted on a crystal growth apparatus 100 as shown in FIG.
- the crystal growth apparatus 100 according to an embodiment of the present invention includes a crucible 1 and a holding member 5.
- the holding member 5 holds the seed crystal 3 fixed to the lower end surface 5A via an adhesive or the like. That is, the holding member 5 is positioned on the seed crystal 3 with an adhesive interposed therebetween.
- the adhesive for example, a carbon adhesive can be used.
- the lower direction is the D1 direction and the upper direction is the D2 direction.
- the holding member 5 has a lower end surface 5A for holding the seed crystal 3.
- the lower end surface 5A has a polygonal shape such as a quadrangular shape or a planar view shape such as a circular shape. Therefore, the holding member 5 has a three-dimensional shape such as a rod shape such as a polygonal column shape or a cylindrical shape, or a rectangular parallelepiped shape.
- the material for the holding member 5 can be selected as appropriate, and for example, an oxide having a melting point higher than that of the solution 2 such as zirconium oxide or magnesium oxide, or a material made of carbon can be used.
- the holding member 5 is made of carbon
- a polycrystalline carbon or a fired body obtained by firing carbon can be used as the holding member 5, for example, a polycrystalline carbon or a fired body obtained by firing carbon can be used.
- what consists of carbon is not restricted to what consists only of carbon. It consists of carbon, for example, as long as it contains 98% by mass or more of carbon, and may contain a small amount of impurities such as aluminum, copper and magnesium in addition to carbon.
- the seed crystal 3 for example, a silicon carbide single crystal or polycrystal can be used.
- the seed crystal 3 can be set so that the thickness is, for example, not less than 0.1 mm and not more than 10 mm.
- the seed crystal 3 has an outer shape when viewed in plan, for example, a polygonal shape or a circular shape.
- the maximum width dimension of the seed crystal 3 can be set to be, for example, 5 mm or more and 20 cm or less.
- the seed crystal 3 has an upper surface 3A that is larger than the lower end surface 5A of the holding member 5, as shown in FIG. That is, the seed crystal 3 is used in which the area of the upper surface 3A is larger than the area of the lower end surface 5A of the holding member 5. A part of the upper surface 3A of the seed crystal 3 is fixed to the lower end surface 5A of the holding member 5 via an adhesive.
- the area of the upper surface 3A of the seed crystal 3 can be set to be 110% or more and 400% or less with respect to the lower end surface 5A, for example.
- the seed crystal 3 may be fixed at any position on the upper surface 3 ⁇ / b> A with respect to the lower end surface 5 ⁇ / b> A of the holding member 5.
- the seed crystal 3 can be held in a balanced manner. Therefore, for example, the crystal growth can be performed while maintaining the lower surface 3B of the seed crystal 3 stably and horizontally with respect to the liquid surface 2A of the solution 2.
- the crucible 1 is made of carbon.
- the crucible 1 has a function as a vessel for melting a raw material of a silicon carbide single crystal to be grown.
- a solution 2 in which carbon is dissolved therein is stored using molten silicon as a solvent.
- a solution growth method is employed, and crystals are grown by creating a state close to thermal equilibrium inside the crucible 1.
- the solution 2 is arranged inside the crucible 1.
- the solution 2 is obtained by dissolving carbon, which is an element that forms a silicon carbide crystal grown on the lower surface 3B of the seed crystal 3, in a solution of silicon that is also an element that forms a silicon carbide crystal.
- the solubility of the element that becomes the solute increases as the temperature of the element that becomes the solvent increases. For this reason, by making the temperature of the lower surface 3B of the seed crystal 3 slightly lower than the temperature of the solution 2, the temperature of the solution 2 in which many solutes are dissolved in the solvent at a high temperature is lowered in the vicinity of the seed crystal 3, Solute begins to precipitate at the thermal equilibrium.
- a silicon carbide crystal can be grown on the lower surface 3B of the seed crystal 3 by utilizing precipitation due to this thermal equilibrium.
- the crucible 1 of the present embodiment includes a solution adjusting member 4 fixed to the inner wall surface 1A.
- the solution adjusting member 4 of this embodiment is formed in a plate shape.
- the solution adjusting member 4 may be any material that does not dissolve into the solution 2 as much as possible using a material having a melting point higher than that of the solution 2.
- the solution adjusting member 4 can be made of, for example, a material made of carbon or an oxide having a melting point higher than that of the solution 2 such as zirconium oxide.
- the crucible 1 and the solution adjusting member 4 are made of carbon, they can be fixed with, for example, a carbon adhesive or can be integrally formed.
- the thickness of the solution adjusting member 4 may be set so as not to dissolve and disappear.
- the thickness of the solution adjustment member 4 can be set to be 1 mm or more and 5 cm or less, for example. Further, the thickness of the solution adjusting member 4 can be set to be 2% or more and 15% or less of the distance between the bottom surface 1B and the liquid surface 2A, for example.
- the solution adjusting member 4 may be thinner than the crucible 1 and thicker than the seed crystal 3.
- the solution adjusting member 4 is disposed between the bottom surface 1B and the liquid surface 2A of the solution 2 when the crucible 1 is used.
- the solution adjusting member 4 is disposed such that the height from the bottom surface 1B is 30% or more and 95% or less of the height from the bottom surface 1B to the liquid surface 2A.
- the height of the liquid surface 2A when the seed crystal 3 is brought into contact with the solution 2 can be used.
- the solution adjusting member 4 has a through-hole 4 a that overlaps the inside of the seed crystal 3 disposed above. That is, when the seed crystal 3 and the solution adjusting member 4 are seen through from above or below (planar see-through), the through hole 4 a is located inside the seed crystal 3.
- the inside of the seed crystal 3 refers to the inside of the outer periphery when the seed crystal 3 is viewed in plan.
- a planar view shape of the through-hole 4a for example, a polygonal shape such as a quadrangular shape or a circular shape can be used.
- the area of the through-hole 4a when the through-hole 4a is viewed in plan can be set to be, for example, 60% or more and 90% or less with respect to the area of the lower surface 3B of the seed crystal 3. Moreover, the area of the through-hole 4a can be set so that it may be 20% or more and 40% or less with respect to the area of the opening part 1a, for example.
- the crucible 1 of the present embodiment has a through hole 4 a that overlaps the inside of the seed crystal 3 in the solution adjusting member 4.
- the convection blocked by the solution adjusting member 4 is concentrated in the through hole 4a, and as shown in FIG. 4, convection CC is generated that flows upward from the solution 2 positioned below the solution adjusting member 4 through the through hole 4a. It becomes easy to do.
- the concentration distribution of carbon in the solution 2 is higher in the lower portion than in the upper portion. Therefore, the lower solution 2 containing a large amount of carbon can easily hit the lower surface 3B of the seed crystal 3 by the convection CC. As a result, a silicon carbide crystal can be easily grown on the lower surface 3B of the seed crystal 3, and the growth rate of the crystal can be increased.
- the inner wall surface 1A It is possible to suppress the growth of miscellaneous crystals near the interface with the liquid surface 2A. That is, the solution adjusting member 4 can suppress generation of miscellaneous crystals in the solution 2 positioned above the solution adjusting member 4. As a result, the crystal growth can be made difficult to be hindered by the miscellaneous crystal, so that the crystal can be grown on the lower surface 3B of the seed crystal 3 for a longer time.
- the through-hole 4a overlaps the center of the lower surface 3B of the seed crystal 3 disposed above when the seed crystal 3 and the solution adjusting member 4 are seen through, and more than half of the lower surface 3B. You may be located so that it may overlap.
- the center of the lower surface 3B refers to the center of the figure when the lower surface 3B is viewed in plan
- “more than half of the lower surface 3B” refers to more than half of the area of the lower surface 3B.
- the through hole 4a By setting the through hole 4a in this way, the flow of convection CC containing a lot of carbon passing through the through hole 4a can be easily directed toward the center of the lower surface 3B. As a result, the convection CC flowing toward the center of the lower surface 3B spreads from the center of the lower surface 3B to the periphery, and can be uniformly applied to the lower surface 3B. Therefore, a crystal with high flatness can be grown on the lower surface 3B. it can. As a result, it is possible to suppress the occurrence of bunching or the like in the crystal growing on the lower surface 3B.
- the plan view shape of the through hole 4a may be set to be similar to the plan view shape of the lower surface 3B of the seed crystal 3.
- FIG. 5 is a cross-sectional view showing a modification of the crucible 1 according to this embodiment, and shows a cross-sectional structure of the crucible 1.
- the solution adjusting member 4 is positioned above an intermediate position Th1 between the bottom surface 1B and the liquid surface 2A of the solution 2 when the crucible 1 is used, and the thickness of the seed crystal 3 from the liquid surface 2A. It may be located below Th2.
- FIG. 6 is a cross-sectional view showing a modification of the crucible 1 according to this embodiment, and shows a cross-sectional structure of the crucible 1.
- the cross-sectional area of the through-hole 4 a may become smaller as it goes upward.
- CC can be applied to the lower surface 3B.
- crystals can be grown faster on the lower surface 3B.
- the “cross-sectional area” of the through hole 4a refers to a “cross-sectional area cut in the horizontal direction” when the through hole 4a is arranged in the vertical direction.
- FIG. 7 is a cross-sectional view showing a modification of the crucible 1 according to this embodiment, and shows a cross-sectional structure of the crucible 1.
- the solution adjusting member 4 may be composed of a plurality of members as shown in FIG.
- the plurality of solution adjusting members 4 are arranged at intervals in the vertical direction, and are arranged so that the respective through holes 4a overlap each other when seen in a plan view.
- the interval between the solution adjustment members 4 may be an interval at which convection hardly occurs between the solution adjustment members 4, and may be set to be 2 mm or more and 10 mm or less, for example.
- the plurality of solution adjustment members 4 are the two solution adjustment members 4 adjacent in the vertical direction among the plurality of solution adjustment members 4. It is preferable that the opening of the through hole 4a of the adjustment member 4 is smaller than the opening of the through hole 4a of the solution adjustment member 4 located on the lower side (lateral width of the through hole).
- the directivity of the convection CC can be enhanced by arranging the through hole 4a so that the through hole 4a is smaller as the through hole 4a is located at the upper side.
- FIG. 8 is a plan view showing a modification of the crucible 1 according to this embodiment, and shows a structure when the crucible 1 excluding the solution 2 is viewed from above.
- FIG. 9 is a cross-sectional view showing a modification of the crucible 1 according to this embodiment, and shows a cross-sectional structure of the crucible 1.
- the solution adjusting member 4 may be fixed to the inner wall surface 1 ⁇ / b> A by only a part of the solution adjusting member 4. In other words, there may be a gap 4 b between the solution adjusting member 4 and the inner wall surface 1 ⁇ / b> A of the crucible 1 when seen through the plane.
- the solution 2 can flow in the direction D1 (downward) from the gap 4b by convection, and the solution 2 can flow in the direction D2 (upward) from the through hole 4a.
- the amount of the solution 2 flowing from the through hole 4a to the lower surface 3B of the seed crystal 3 can be increased, and the crystal can be grown faster on the lower surface 3B.
- the gaps 4b may be arranged such that the plurality of gaps 4b have the same distance between the adjacent gaps 4b. That is, the plurality of gaps 4b may be arranged at equal intervals in the circumferential direction.
- the gap 4b may have a shape along the through hole 4a when the crucible 1 and the solution adjusting member 4 are viewed from above. By forming the gap 4b along the through hole 4a in this way, it is possible to reduce the occurrence of extreme unevenness in the flow of the solution 2 in the plane direction, and to easily apply the convection to the lower surface 3B. be able to.
- the gap 4b may be formed so that the distance from the edge of the through hole 4a to the edge of the gap 4b is uniform. By forming the gap 4b in this way, it is possible to reduce the occurrence of extreme unevenness in the flow of the solution 2 in the planar direction.
- the length of the gap 4b along the inner wall surface 1A of the crucible 1 is longer than the length along the inner wall surface 1A of the fixing portion of the solution adjusting member 4 to the crucible 1. It can be large. Thus, by making the length of the gap 4b along the inner wall surface 1A larger than the length of the fixed portion, it is possible to reduce the occurrence of extreme unevenness of the flow of the solution 2 in the plane direction.
- the area of the gap 4b can be set to be, for example, 20% to 50% in total with respect to the area of the opening 1a of the crucible 1. Moreover, you may set the area of the clearance gap 4b so that it may become larger than the area of the through-hole 4a.
- the solution adjusting member 4 may be formed in a column shape.
- the thickness of the solution adjusting member 4 may be set to, for example, 50% or more of the distance between the bottom surface 1B of the crucible 1 and the liquid surface 2A of the solution 2 in use.
- the thickness of the solution adjusting member 4 may be more than half of the distance between the bottom surface 1B and the liquid surface 2A, the distance between the through hole 4a and the seed crystal 3 can be reduced.
- the flow of the flowing solution 2 can be easily applied to the lower surface 3B.
- the thickness of the solution adjusting member 4 may be set to 60% or more of the distance between the bottom surface 1B and the liquid surface 2A. As described above, when the thickness of the solution adjusting member 4 is set, when the solution 2 convects from the through hole 4a to the gap 4b and from the gap 4b to the through hole 4a, the flow path of the solution 2 as a whole. Can be reduced. As a result, the generation of local vortices in the solution 2 can be reduced. For example, the carbon in the solution 2 is locally retained and the carbon in the solution 2 is easily supplied to the lower surface 3B. be able to.
- the maximum thickness of the solution adjusting member 4 is set to 85% or less of the distance between the bottom surface 1B and the liquid surface 2A, for example, so as not to hinder crystal growth. In such a case, part of the lower surface 3 d of the solution adjusting member 4 may be fixed even on the bottom surface 1 ⁇ / b> B of the crucible 1.
- the solution adjusting member 4 may be positioned such that the distance between the upper surface 4c of the solution adjusting member 4 and the liquid surface 2A of the solution 2 is smaller than the distance between the lower surface 4d of the solution adjusting member 4 and the bottom surface 1B of the crucible 1. Good. That is, the solution adjustment member 4 may be fixed to the inner wall surface 1A in a state of being close to the liquid surface 2A side.
- the solution adjusting member 4 may be fixed to the inner wall surface 1A in a state of being close to the liquid surface 2A side.
- FIG. 10 is a cross-sectional view showing a modification of the crucible 1 according to this embodiment, and shows a cross-sectional structure of the crucible 1.
- the through-hole 4a may be formed so that the cross-sectional area increases as it goes upward. As described above, the cross-sectional area gradually increases as the through-hole 4a moves upward, so that compared with the case where the cross-sectional area of the through-hole 4a does not change, the opening of the upper surface 4c of the through-hole 4a suddenly increases. The expansion of the flow path of the solution 2 can be reduced. As a result, the occurrence of local vortices in the solution 2 at the edge of the opening of the upper surface 4c can be reduced.
- FIG. 11 is a cross-sectional view showing a modification of the crucible 1 according to the present embodiment, and shows a cross-sectional structure of the crucible 1.
- the through-hole 4a may be positioned so that the center of the through-hole 4a does not overlap with the center of the lower surface 3B of the seed crystal 3 disposed above when the seed crystal 3 and the solution adjusting member 4a are seen through the plane. .
- the through hole 4a so as to be shifted from the center of the lower surface 3B when viewed in plan, it is possible to easily apply convection containing a large amount of carbon to the edge of the lower surface 3B. Crystals can be step flow grown inward from the edge of 3B.
- the through-hole 4a is the midpoint of the distance from the center of the bottom surface 3B of the seed crystal 3 to the edge of the bottom surface 3B when the seed crystal 3 and the solution adjusting member 4 are seen through the plane. It may be arranged so as to be located on the edge side of the lower surface 3b.
- the crystal growth apparatus 100 mainly has a crucible 1 and a holding member 5.
- the crucible 1 is disposed inside the crucible container 6.
- the crucible container 6 has a function of holding the crucible 1.
- a heat insulating material 7 is disposed between the crucible container 6 and the crucible 1. This heat insulating material 7 surrounds the crucible 1.
- the heat insulating material 7 suppresses heat radiation from the crucible 1 and contributes to maintaining the temperature of the crucible 1 stably.
- the crucible 1 may be rotatably provided.
- the crucible 1 is heated by the heating mechanism 8.
- the heating mechanism 8 of the present embodiment employs an induction heating method in which the crucible 1 is heated by electromagnetic induction, and includes a coil 9 and an AC power supply 10.
- the coil 9 is formed of a conductor and wound around the periphery of the crucible 1.
- the AC power supply 10 is for flowing an alternating current through the coil 9, and the heating time to the set temperature in the crucible 1 can be shortened by flowing a larger alternating current.
- the crucible 1 is heated by an induction heating method. However, even if the thickness of the crucible 1 is reduced, an induction current is caused to flow through the solution 2 itself by this electromagnetic field to generate heat. Good.
- the seed crystal 3 is put into the solution 2 of the crucible 1 from the opening of the crucible 1 by the transport mechanism 11, and is loaded so that the lower surface of the seed crystal 3 is in contact with the liquid level of the solution 2.
- the transport mechanism 11 also has a function of pulling up the crystal grown on the lower surface of the seed crystal 3 and carrying it out of the crucible 1.
- the transport mechanism 11 includes a holding member 5 and a power source 12. Via this holding member 5, the seed crystal 3 is carried in and the crystal grown on the lower surface of the seed crystal 3 is carried out.
- the seed crystal 3 is attached to the lower end surface of the holding member 5, and the movement of the holding member 5 in the vertical direction (D 1, D 2 direction) is controlled by the power source 12. That is, the holding member 5 holds the seed crystal 3 at the lower end surface, and allows the seed crystal 3 to be put in or pulled up from the opening of the crucible 1.
- the holding member 5 may be rotatably provided.
- the AC power source 10 of the heating mechanism 8 and the power source 12 of the transport mechanism 11 are connected to the control unit 13 and controlled. That is, in the crystal growth apparatus 100, the heating and temperature control of the solution 2 and the carry-in / out of the seed crystal 3 are controlled by the control unit 13 in conjunction with each other.
- the control unit 13 includes a central processing unit and a storage device such as a memory, and is composed of, for example, a known computer.
- the holding member 5 described above is attached to the transport mechanism 11 of the crystal growth apparatus 100 of the present embodiment. Then, the lower surface of the seed crystal 3 fixed to the lower end surface of the holding member 5 can be brought into contact with the solution 2 to grow a crystal on the lower surface of the seed crystal 3.
- the crystal growth apparatus 100 having the above-described crucible 1 makes it easy for the silicon solution 2 containing carbon to hit the convection of the solution 2 containing a large amount of carbon on the lower surface of the seed crystal 3.
- silicon carbide crystals can be grown quickly.
- a crystal growth method according to an embodiment of the present invention includes a preparation process, a solution storage process, a contact process, and a crystal growth process.
- FIG. 12 is a diagram showing an example of a preparation process of the crystal growth method, and shows the crucible 1, the seed crystal 3, and the holding member 5.
- FIG. 13 is a diagram showing an example of the solution storage step of the crystal growth method, and shows a state in which the solution 2 is stored inside the crucible 1.
- FIG. 14 is a diagram illustrating an example of the contact step of the crystal growth method, and shows a state in which the lower surface 3B of the seed crystal 3 is brought into contact with the liquid surface 2A of the solution 2.
- FIG. 15 is a diagram showing an example of a crystal growth process of the crystal growth method, and shows a state where the crystal 3 ′ is growing on the lower surface 3 ⁇ / b> B of the seed crystal 3.
- the preparation step As shown in FIG. 12, the crucible 1 is held by the holding member 5, the holding member 5 capable of putting the seed crystal 3 in and out of the opening 1 a of the crucible 1, and the holding member 5.
- a seed crystal 3 made of silicon carbide having an upper surface 3A is prepared.
- the solution 2 is accommodated in the crucible 1 so that the liquid level 2 ⁇ / b> A is positioned above the solution adjusting member 4.
- particles containing silicon as a main component are put in the crucible 1, and the crucible 1 or the particles are heated by the heating mechanism 8 to dissolve the particles.
- the silicon solution 2 containing carbon is accommodated in the crucible 1 by mixing carbon particles or by dissolving carbon from a part of the crucible 1.
- the seed crystal 3 is put inside the opening 1 a of the crucible 1 by the holding member 5, and the lower surface 3 ⁇ / b> B of the seed crystal 3 is brought into contact with the liquid level 2 ⁇ / b> A of the solution 2. At this time, the seed crystal 3 may be once immersed in the solution 2 and meltback may be performed.
- the lower surface 3 ⁇ / b> B is arranged with the lower surface 3 ⁇ / b> B of the seed crystal 3 overlapping the through hole 4 a of the solution adjusting member 4.
- a silicon carbide crystal is grown.
- the seed crystal 3 may be disposed so as to overlap the through hole 4a of the solution adjusting member 4 at the same time that the lower surface 3b is brought into contact with the solution 2 in the contact step described above, or the lower surface 3b is brought into contact with the solution 2. You may arrange
- the crystal 3 ′ is grown on the lower surface 3B of the seed crystal 3 using the crucible 1 described above, convection of the solution 2 containing a large amount of carbon on the lower surface 3B of the seed crystal 3 is performed. It is possible to increase the growth rate of the crystal 3 ′ with respect to the lower surface 3B. As a result, the productivity of the crystal 3 'grown on the lower surface 3B can be improved.
- the crystal 3 ′ may be grown while rotating the crucible 1 or the holding member 5.
- the temperature T1 of the solution 2 positioned below the solution adjusting member 4 is set higher than the temperature T2 of the solution 2 positioned above the solution adjusting member 4. Also good.
- the temperature of the solution 2 positioned below the solution adjusting member 4 positioned at the lowermost end can be used as the temperature T1, and the temperature T2 is the highest.
- the temperature of the solution 2 positioned above the solution adjusting member 4 positioned at the upper end can be used.
- the temperature difference can be given in the solution 2 by making the temperature T1 higher than the temperature T2.
- convection can be easily generated from the high temperature T2 to the low temperature T1.
- convection toward the lower surface 3B of the seed crystal 3 can be strengthened, and the growth rate of the crystal 3 'grown on the lower surface 3B can be increased.
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- Inorganic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
本発明の一実施形態に係る坩堝1は、炭素を含む珪素の溶液2を内部に収容し、上方から種結晶3の下面3Bを溶液2に接触させた後、種結晶3を引き上げることによって、種結晶3の下面3Bに溶液2から炭化珪素の結晶3’を成長させる溶液成長法に用いられるものである。坩堝1は、坩堝1に溶液2が収容された際に、坩堝1の底面1Bと溶液2の液面2Aとの間に位置するように内壁面1Aに固定された、上方に配置される種結晶3の内側に重なる貫通孔4aを有する溶液調整部材4を備えたものである。本実施形態の坩堝1は、図1に示すような結晶成長装置100に搭載されて用いられるものである。なお、本発明の一実施形態に係る結晶成長装置100は、坩堝1および保持部材5を有している。
本実施形態に係る坩堝の一変形例について、図5を参照しつつ説明する。図5は、本実施形態に係る坩堝1の変形例を示す断面図であり、坩堝1の断面の構造を示している。
本実施形態に係る坩堝の他の変形例について、図6を参照しつつ説明する。図6は、本実施形態に係る坩堝1の変形例を示す断面図であり、坩堝1の断面の構造を示している。
本実施形態に係る坩堝のさらに他の変形例について、図7を参照しつつ説明する。図7は、本実施形態に係る坩堝1の変形例を示す断面図であり、坩堝1の断面の構造を示している。
本実施形態に係る坩堝のさらに他の変形例について、図8および図9を参照しつつ説明する。図8は、本実施形態に係る坩堝1の変形例を示す平面図であり、溶液2を除いた坩堝1を上方から見たときの構造を示している。図9は、本実施形態に係る坩堝1の変形例を示す断面図であり、坩堝1の断面の構造を示している。
本実施形態に係る坩堝のさらに他の変形例について、図10を参照しつつ説明する。図10は、本実施形態に係る坩堝1の変形例を示す断面図であり、坩堝1の断面の構造を示している。
本実施形態に係る坩堝のさらに他の変形例について、図11を参照しつつ説明する。図11は、本実施形態に係る坩堝1の変形例を示す断面図であり、坩堝1の断面の構造を示している。
次に、本実施形態に係る結晶成長装置100の各構成について図1を参照しつつ説明する。結晶成長装置100は、主に坩堝1および保持部材5を有するものである。坩堝1は、坩堝容器6の内部に配置されている。坩堝容器6は、坩堝1を保持する機能を担っている。この坩堝容器6と坩堝1との間には、保温材7が配置されている。この保温材7は、坩堝1の周囲を囲んでいる。保温材7は、坩堝1からの放熱を抑制し、坩堝1の温度を安定して保つことに寄与している。なお、坩堝1は回転可能に設けられていてもよい。
次に、本発明の一実施形態にかかる結晶成長方法を説明する。本発明の一実施形態にかかる結晶成長方法は、準備工程、溶液収容工程、接触工程および結晶成長工程を有している。なお、図12は、結晶成長方法の準備工程の一例を示す図であり、坩堝1、種結晶3および保持部材5を示している。図13は、結晶成長方法の溶液収容工程の一例を示す図であり、坩堝1の内部に溶液2を収容した様子を示している。図14は、結晶成長方法の接触工程の一例を示す図であり、溶液2の液面2Aに種結晶3の下面3Bを接触させた様子を示している。図15は、結晶成長方法の結晶成長工程の一例を示す図であり、種結晶3の下面3Bに結晶3’が成長している様子を示している。
準備工程では、図12に示すように、上述した坩堝1と、坩堝1の開口部1aから内部に種結晶3を入れたり引き上げたりが可能な保持部材5と、保持部材5によって保持されている上面3Aを有する、炭化珪素からなる種結晶3を準備する。
次に、図13に示すように、溶液調整部材4よりも上方に液面2Aが位置するように、坩堝1の内部に溶液2を収容する。溶液2を坩堝1に収容する方法としては、坩堝1内に珪素を主成分とする粒子を入れて、坩堝1または当該粒子を加熱機構8で加熱して粒子を溶解させる。この際、炭素の粒子を混ぜたり、坩堝1の一部から炭素が溶け出したりすることによって、炭素を含む珪素の溶液2が坩堝1の内部に収容されることとなる。
その後、図14に示すように、保持部材5によって坩堝1の開口部1aから内部に種結晶3を入れて、種結晶3の下面3Bを溶液2の液面2Aに接触させる。このとき、種結晶3を一度、溶液2内にすべて浸漬してメルトバックを行なってもよい。
しかる後、図15に示すように、種結晶3および溶液調整部材4を平面透視したとき、種結晶3の下面3Bを溶液調整部材4の貫通孔4aに重なるように配置した状態で、下面3Bに炭化珪素の結晶を成長させる。そして、少しずつ保持部材5を上方に引き上げることによって、下面3Bに結晶3’をD1方向(下方向)に連続して成長させることができる。なお、種結晶3は、上述した接触工程にて、下面3bを溶液2に接触させると同時に溶液調整部材4の貫通孔4aに重なるように配置させてもよいし、下面3bを溶液2に接触させた後に貫通孔4aに重なるように配置させてもよい。また、下面3Bに結晶3’が成長している場合には、成長につれて結晶3’の下端面が下面3Bに相当するものとなる。
結晶成長工程において、図15に示すように、溶液調整部材4よりも下方に位置する溶液2の温度T1を、溶液調整部材4よりも上方に位置する溶液2の温度T2に比べて高くしてもよい。ここで、溶液調整部材4が上下方向に複数存在する場合には、温度T1として最下端に位置する溶液調整部材4よりも下方に位置する溶液2の温度を用いることができ、温度T2として最上端に位置する溶液調整部材4よりも上方に位置する溶液2の温度を用いることができる。
Claims (8)
- 炭素を含む珪素の溶液を内部に収容し、上方から種結晶の下面を前記溶液に接触させた後、前記種結晶を引き上げることによって、前記種結晶の下面に前記溶液から炭化珪素の結晶を成長させる溶液成長法に使用する坩堝であって、
使用時に底面と前記溶液の液面との間に位置するように内壁面に固定された、上方に配置される前記種結晶の内側に重なる貫通孔を有する溶液調整部材を備えた、炭素からなる坩堝。 - 前記貫通孔は、上方に配置される前記種結晶の下面の中心に重なるとともに、前記種結晶の下面の半分以上に重なる請求項1に記載の坩堝。
- 前記貫通孔は、横断面積が上方向に向かうにつれて小さくなっている、請求項1または2に記載の坩堝。
- 前記溶液調整部材を複数備えており、
複数の前記溶液調整部材は、上下方向に互いに間隔をあけて、それぞれの前記貫通孔が重なるように配置されている、請求項1~3のいずれかに記載の坩堝。 - 複数の前記溶液調整部材のうち上下に隣接する2つの前記溶液調整部材において上下に重なる前記貫通孔は、上側に位置する前記貫通孔の上側の開口が、下側に位置する前記貫通孔の上側の開口よりも小さい、請求項4に記載の坩堝。
- 請求項1~5のいずれかに記載の坩堝と、
種結晶を保持して前記坩堝の開口部から前記種結晶を入れたり引き上げたりが可能な保持部材と
を有する結晶成長装置。 - 請求項1~5のいずれかに記載の坩堝、種結晶を保持して前記坩堝の開口部から前記種結晶を入れたり引き上げたりが可能な保持部材、および該保持部材によって上面が保持されている炭化珪素からなる前記種結晶を準備する工程と、
前記坩堝の内部に、前記溶液調整部材よりも上方に液面が位置するように、炭素を含む珪素の溶液を収容する工程と、
前記保持部材によって前記坩堝の開口部から前記種結晶を入れて、該種結晶の下面を前記溶液に接触させる工程と、
前記種結晶を下面が前記溶液調整部材の前記貫通孔に重なるように配置した状態で前記保持部材によって前記種結晶を引き上げて、該種結晶の下面に炭化珪素の結晶を成長させる工程と
を備える結晶成長方法。 - 前記炭化珪素の結晶を成長させる工程において、前記溶液調整部材よりも下方に位置する前記溶液の温度を、前記溶液調整部材よりも上方に位置する前記溶液の温度に比べて高くする請求項7に記載の結晶成長方法。
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| US14/417,529 US20150211147A1 (en) | 2012-07-27 | 2013-07-26 | Crucible, crystal growing apparatus, and crystal growing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150225872A1 (en) * | 2012-09-04 | 2015-08-13 | Toyota Jidosha Kabushiki Kaisha | Single crystal production apparatus, crucible for use therein, and method of producing single crystal |
| CN114808109A (zh) * | 2022-05-27 | 2022-07-29 | 眉山博雅新材料股份有限公司 | 一种连接装置 |
| TWI892148B (zh) * | 2022-06-07 | 2025-08-01 | 大陸商眉山博雅新材料股份有限公司 | 晶體製備裝置及晶體製備方法 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101966696B1 (ko) * | 2017-08-31 | 2019-08-13 | 한국세라믹기술원 | 용액성장법에서 단결정 성장속도를 증가시키기 위한 도가니 내장형 구조부재 |
| CN116136029B (zh) * | 2023-04-04 | 2023-06-09 | 北京青禾晶元半导体科技有限责任公司 | 一种碳化硅晶体的生长装置和生长方法 |
| CN116397332A (zh) * | 2023-05-19 | 2023-07-07 | 通威微电子有限公司 | 一种碳化硅生长坩埚、装置及生长工艺 |
| US12404600B2 (en) * | 2023-05-31 | 2025-09-02 | Siemens Medical Solutions Usa, Inc. | Fins on crucible or gussets on refractory lining for facilitating exclusion of impurities from a boule |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05345700A (ja) * | 1992-06-12 | 1993-12-27 | Sanyo Electric Co Ltd | 炭化ケイ素単結晶の液相エピタキシャル成長装置 |
| JP2001106600A (ja) * | 1999-10-12 | 2001-04-17 | Mitsubishi Cable Ind Ltd | 炭化硅素結晶の液相成長方法 |
| JP2009274933A (ja) * | 2008-05-16 | 2009-11-26 | Mitsubishi Electric Corp | 単結晶成長装置および単結晶の製造方法 |
| JP2011098870A (ja) * | 2009-11-09 | 2011-05-19 | Toyota Motor Corp | SiC単結晶の製造装置及び製造方法 |
| JP2012136388A (ja) * | 2010-12-27 | 2012-07-19 | Sumitomo Metal Ind Ltd | SiC単結晶の製造装置及びそれに用いられる坩堝 |
| JP2013173645A (ja) * | 2012-02-24 | 2013-09-05 | Hitachi Chemical Co Ltd | 結晶成長装置及び結晶成長方法 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2813592B2 (ja) * | 1989-09-29 | 1998-10-22 | 住友シチックス株式会社 | 単結晶製造方法 |
| JPH03197386A (ja) * | 1989-12-26 | 1991-08-28 | Showa Denko Kk | 化合物半導体単結晶の製造方法 |
| JP2943430B2 (ja) * | 1990-10-05 | 1999-08-30 | 住友電気工業株式会社 | 単結晶の製造方法および製造装置 |
| KR20130002616A (ko) * | 2011-06-29 | 2013-01-08 | 에스케이이노베이션 주식회사 | 탄화규소 단결정 성장 장치 및 그 방법 |
| JP5828810B2 (ja) * | 2012-07-18 | 2015-12-09 | 新日鐵住金株式会社 | 溶液成長法に用いられるSiC単結晶の製造装置、当該製造装置に用いられる坩堝及び当該製造装置を用いたSiC単結晶の製造方法 |
-
2013
- 2013-07-26 WO PCT/JP2013/070369 patent/WO2014017648A1/ja not_active Ceased
- 2013-07-26 JP JP2014527034A patent/JP6001664B2/ja not_active Expired - Fee Related
- 2013-07-26 US US14/417,529 patent/US20150211147A1/en not_active Abandoned
-
2016
- 2016-09-01 JP JP2016170517A patent/JP6262819B2/ja not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05345700A (ja) * | 1992-06-12 | 1993-12-27 | Sanyo Electric Co Ltd | 炭化ケイ素単結晶の液相エピタキシャル成長装置 |
| JP2001106600A (ja) * | 1999-10-12 | 2001-04-17 | Mitsubishi Cable Ind Ltd | 炭化硅素結晶の液相成長方法 |
| JP2009274933A (ja) * | 2008-05-16 | 2009-11-26 | Mitsubishi Electric Corp | 単結晶成長装置および単結晶の製造方法 |
| JP2011098870A (ja) * | 2009-11-09 | 2011-05-19 | Toyota Motor Corp | SiC単結晶の製造装置及び製造方法 |
| JP2012136388A (ja) * | 2010-12-27 | 2012-07-19 | Sumitomo Metal Ind Ltd | SiC単結晶の製造装置及びそれに用いられる坩堝 |
| JP2013173645A (ja) * | 2012-02-24 | 2013-09-05 | Hitachi Chemical Co Ltd | 結晶成長装置及び結晶成長方法 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150225872A1 (en) * | 2012-09-04 | 2015-08-13 | Toyota Jidosha Kabushiki Kaisha | Single crystal production apparatus, crucible for use therein, and method of producing single crystal |
| CN114808109A (zh) * | 2022-05-27 | 2022-07-29 | 眉山博雅新材料股份有限公司 | 一种连接装置 |
| CN114808109B (zh) * | 2022-05-27 | 2023-08-18 | 眉山博雅新材料股份有限公司 | 一种连接装置 |
| TWI892148B (zh) * | 2022-06-07 | 2025-08-01 | 大陸商眉山博雅新材料股份有限公司 | 晶體製備裝置及晶體製備方法 |
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| US20150211147A1 (en) | 2015-07-30 |
| JP2017014105A (ja) | 2017-01-19 |
| JP6262819B2 (ja) | 2018-01-17 |
| JPWO2014017648A1 (ja) | 2016-07-11 |
| JP6001664B2 (ja) | 2016-10-05 |
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