WO2006064797A1 - 半導体単結晶製造装置および製造方法 - Google Patents
半導体単結晶製造装置および製造方法 Download PDFInfo
- Publication number
- WO2006064797A1 WO2006064797A1 PCT/JP2005/022867 JP2005022867W WO2006064797A1 WO 2006064797 A1 WO2006064797 A1 WO 2006064797A1 JP 2005022867 W JP2005022867 W JP 2005022867W WO 2006064797 A1 WO2006064797 A1 WO 2006064797A1
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- WIPO (PCT)
- Prior art keywords
- exhaust pipe
- heater
- exhaust
- single crystal
- heat shield
- Prior art date
Links
- 239000013078 crystal Substances 0.000 title claims abstract description 66
- 239000004065 semiconductor Substances 0.000 title claims description 24
- 238000000034 method Methods 0.000 title description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 33
- 238000005192 partition Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 24
- 229910002804 graphite Inorganic materials 0.000 abstract description 21
- 239000010439 graphite Substances 0.000 abstract description 21
- 239000007795 chemical reaction product Substances 0.000 abstract description 14
- 239000000463 material Substances 0.000 abstract description 6
- 238000009833 condensation Methods 0.000 abstract description 3
- 230000005494 condensation Effects 0.000 abstract description 3
- 230000008021 deposition Effects 0.000 abstract 1
- 239000012774 insulation material Substances 0.000 abstract 1
- 239000000155 melt Substances 0.000 description 20
- 239000007789 gas Substances 0.000 description 18
- 239000010453 quartz Substances 0.000 description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 229910052710 silicon Inorganic materials 0.000 description 11
- 239000010703 silicon Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 239000011810 insulating material Substances 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 9
- 230000005855 radiation Effects 0.000 description 9
- 239000011261 inert gas Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
Classifications
-
- H01L29/04—
-
- 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
- C30B15/14—Heating of the melt or the crystallised materials
-
- 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
-
- 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
- C30B29/02—Elements
- C30B29/06—Silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
-
- 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
-
- 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]
-
- 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
- Y10T117/106—Seed pulling including sealing means details
-
- 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
- Y10T117/1076—Apparatus for crystallization from liquid or supercritical state having means for producing a moving solid-liquid-solid zone
- Y10T117/108—Including a solid member other than seed or product contacting the liquid [e.g., crucible, immersed heating element]
Definitions
- the present invention relates to a semiconductor single crystal manufacturing apparatus and manufacturing method.
- High-purity silicon single crystals are mainly used for substrates of semiconductor elements.
- One of the methods for producing a silicon single crystal is the Chiyoklarsky method (CZ method).
- CZ method As shown in FIG. 8 as an example, the quartz crucible 5 installed in the chamber 1 of the semiconductor single crystal manufacturing apparatus is filled with silicon polycrystal, and the heater 6 provided around the quartz crucible 5 is charged. Therefore, the silicon polycrystal is heated and melted to form the melt 4, and the seed crystal attached to the seed chuck 14 is immersed in the melt 4, and the seed chuck 14 and the quartz crucible 5 are rotated while rotating in the same direction or in the opposite direction. By pulling up the chuck 14, the silicon single crystal 9 grows.
- the heat insulating cylinder 7 is formed of a heat insulating material.
- the inert gas introduced from the upper part of the chamber 1 flows down along the single crystal 9 and then flows along the inner wall of the quartz crucible 5 from the melt surface. Ascended, flows down the gap between the graphite crucible 3 and the heater 6, or the gap between the heater 6 and the heat insulating cylinder 7, passes through the exhaust port at the bottom of the chamber 1 and the external exhaust pipe, along with the evaporant and reaction products. It is discharged outside the furnace.
- the evaporated product and reaction product adhere to the graphite crucible 3, the heater 6, the heat insulating cylinder 7 and the like while being carried out of the furnace together with the inert gas.
- the inert gas containing evaporated SiO comes into contact, and SiO and graphite react to promote SiC conversion.
- the graphite crucible 3 is deformed as the number of uses increases due to the difference in thermal expansion coefficient between the formed SiC and graphite.
- the heater 6 also comes into contact with the evaporated inert gas containing SiO and reacts with SiO and graphite, so that the central portion of the heater 6 and the end of the slit that are at a high temperature are quickly reduced in thickness.
- the temperature distribution of the melt 4 changes and adversely affects the quality of the single crystal, for example, the oxygen concentration.
- Patent Document 1 As shown in FIG. 9, an inner cylinder (heat shield) 11 is provided in the vicinity of the outer peripheral surface of the heater 6 and heat insulation is performed. An outer cylinder (heat shield) 12 that covers the inner peripheral surface of the cylinder 7 is provided, and the inert gas is exhausted using the exhaust path between the inner cylinder 11 and the outer cylinder 12.
- the Ar gas introduced from the upper part of the chamber 1 passes through the gap between the lower end of the radiation screen 10 and the melt 4, and then the quartz crucible. Ascends along the inner surface of 4 and flows down the gap between the inner cylinder 11 and the outer cylinder 12 and is discharged out of the furnace.
- Patent Document 2 describes a single crystal manufacturing apparatus having a structure in which a heat insulating material is provided outside a heater, and an exhaust pipe is provided outside the heat insulating material.
- Patent Document 3 describes a single crystal manufacturing apparatus having a structure in which a heat insulating material is provided outside a heater and an exhaust pipe is provided so as to penetrate the heat insulating material.
- Patent Document 1 Japanese Patent Laid-Open No. 7-223894
- Patent Document 2 JP-A-9-2892
- Patent Document 3 Japanese Patent Laid-Open No. 2001-10893
- the heat generated by the heater 6 is blocked by the inner cylinder 11,
- the temperature of the outer cylinder 12 becomes extremely low, for example, about 1600K or less.
- the exhaust gas and reaction products generated in the furnace due to contact with the exhaust gas easily adhere to and condense on the outer cylinder 12.
- the exhaust passage between the inner cylinder 11 and the outer cylinder 12 may be clogged due to accumulation, and the exhaust capacity may be hindered. In some cases, the process may not be continued.
- the low temperature outer cylinder 12 is easily converted to SiC, so that the number of times and time until breakage are shortened due to SiC conversion, and it is necessary to replace it early, which may increase the cost.
- the outer cylinder 12 has a structure that supports the radiating screen 10. Therefore, when exhaust gas comes into contact with the outer cylinder 12 and the SiC conversion is promoted, the coefficient of thermal expansion is increased at the site where the SiC is converted. Change.
- the coefficient of thermal expansion of the outer cylinder 12 changes as the number of times of use and usage time increase, the height position of the radiation screen 10 supported by the outer cylinder 12 changes.
- the distance between the lower end position of the radiating screen 10 and the melt surface greatly affects the quality of the single crystal 9 to be pulled up.
- the present invention has been made in view of such a situation, and allows the evaporated product and reaction product generated in the furnace to be exhausted without touching the graphite crucible and the heater, and the exhaust pipe itself is provided. It can be maintained at a high temperature to prevent clogging of the exhaust pipe by suppressing the attachment and condensation of evaporates and reaction products, and to prevent the exhaust pipe itself from becoming SiC, thereby improving the durability of the exhaust pipe.
- the first problem to be solved is to improve the single crystal by suppressing the change in the coefficient of thermal expansion of the member that supports the radiation screen.
- the present invention has a second problem to be solved by reducing the manufacturing cost by configuring the exhaust pipe with a small amount of material. It is.
- the first invention is:
- a crucible that melts the raw material of the semiconductor single crystal and a heater around the crucible that heats the raw material in the crucible are placed in the chamber, and the seed crystal is immersed in the melted raw material to pull up the single crystal.
- a plurality of exhaust pipes are provided outside the heater and along a circumferential direction of the heater.
- the second invention is the first invention
- a heat shield is provided outside the heater
- a plurality of exhaust pipes are provided along the circumferential direction of the heater between the heater and the heat shield.
- a third invention is the first invention
- a heat insulation cylinder is provided outside the heater
- a plurality of exhaust pipes are provided between the heater and the heat insulating cylinder along the circumferential direction of the heater.
- a fourth invention is any one of the first to third inventions.
- the plurality of exhaust pipes communicate with a plurality of exhaust ports provided at the bottom of the chamber.
- the fifth invention is the second invention, wherein
- the plurality of exhaust pipes may be exhaust pipes having a partition wall independent of the heat shield.
- a sixth invention is the second invention, wherein
- the plurality of exhaust pipes are exhaust pipes having a partition wall shared with the heat shield.
- a seventh invention uses the semiconductor single crystal manufacturing apparatus according to any one of the first to sixth inventions.
- the exhaust pipe 20 has an upper end opening located above the upper end of the heater 6 and a lower end opening communicating with the exhaust port 8b. It flows only in the exhaust pipe 20 where it hardly touches the graphite crucible 3 and the heater 6. For this reason, as in the prior art described in FIG. 9, the graphite crucible 3 and the heater 6 are avoided from being made of SiC, and the service life can be greatly extended.
- the exhaust pipe 20 of the present invention is provided between the heater 6 and the heat shield 12 and is made of a material having good heat conductivity. Retained. For this reason, according to the present invention, the deposits and condensation of the evaporant and reaction product on the exhaust pipe 20 are suppressed, and clogging of the exhaust pipe 20 is prevented. Further, the exhaust pipe 20 can be prevented from being made of SiC. For this reason, it is possible to lengthen the time until the exhaust pipe 20 is replaced, and to reduce the cost. Further, even if the heat insulating cylinder 7 is not covered with the heat shield 12, the heat insulating cylinder 7 hardly comes into contact with the evaporated SiO. Therefore, the heat shield 12 becomes unnecessary, and the cost can be further reduced.
- exhaust gas hardly comes into contact with the heat shield 12, so that the heat shield 12 is prevented from being made of SiC.
- the time until the heat shield 12 is replaced can be lengthened, and the cost can be reduced.
- the distance between the lower end position of the radiation screen 10 supported by the heat shield 12 and the melt surface can be maintained at the initially set value, and can be simply lifted.
- the crystal 9 can be maintained in high quality, and the product yield can be improved.
- the exhaust pipe 20 is provided with the exhaust port 8b (exhaust port 2) having a relatively small area.
- the present invention is not limited to the configuration shown in Fig. 1, and is provided outside the heater 6 and provided with a plurality of exhaust pipes 20 along the circumferential direction of the heater 6. Any configuration is possible (first invention).
- a plurality of exhaust pipes 20 may be provided between the heater 6 and the heat sink 12 along the circumferential direction of the heater 6 (second invention).
- the plurality of exhaust pipes 20 may be exhaust pipes 20 having partition walls independent of the heat shield 12 (fifth invention), or may be exhaust pipes 20 sharing the partition walls with the heat shield 12.
- a plurality of exhaust pipes 20 are provided along the circumferential direction of the heater 6 between the heater 6 and the heat sink 12 (second invention).
- the exhaust pipe 20 may be an exhaust pipe having a partition wall shared with the heat shield 12 (sixth invention).
- a plurality of exhaust pipes 20 are provided outside the heat shield 12 along the circumferential direction of the heat shield 12, and the plurality of exhaust pipes 20 are shared with the heat shield 12. You may comprise with the exhaust pipe which has a partition used.
- the semiconductor single crystal manufacturing method of the present invention since the change in the coefficient of thermal expansion of the heat shield 12 can be suppressed, the distance between the lower end position of the radiation screen 10 and the melt surface was initially set. Value, the high-quality single crystal can be stably pulled up and manufactured, and the service life of the parts used can be greatly extended, so the production cost of the single crystal can be kept low (Seventh invention).
- FIG. 1 is a cross-sectional view showing the configuration of the silicon single crystal manufacturing apparatus of the embodiment.
- FIG. 1 (a) is a side view
- FIG. 1 (b) is a top view.
- the cross-section corresponds to the top view of Fig. 1 (b), and the BB 'cross-section of Fig. 1 (b) corresponds to the side view of Fig. 1 (a). I win.
- a crucible shaft 2 is provided at the center of the chamber 1.
- the central axis of the crucible axis 2 corresponds to the central axis of the chamber 1.
- the upper end of the crucible shaft 2 supports the graphite crucible 3 via a crucible holder not shown.
- a quartz crucible 5 is accommodated in the graphite crucible 3. Quartz crucible 5 stores melt 4.
- a cylindrical heater 6 is provided so as to surround the periphery of the graphite crucible 3. Furthermore, a cylindrical heat insulating cylinder 7 is provided outside the heater 6 so as to surround the heater 6.
- the heat insulating cylinder 7 is made of a heat insulating material and is provided along the inner wall of the side surface of the chamber 1. The heater 6 and the heat insulating cylinder 7 are provided concentrically with respect to the center of the quartz crucible 5 (central axis 2c).
- the single crystal 9 is pulled up by the central force of the quartz crucible 5. That is, the seed crystal attached to the seed chuck 14 is immersed in the melt 4, and the seed chuck 14 is pulled up while the seed chuck 14 and the quartz crucible 5 are rotated in the same direction or in the opposite direction, so that the silicon single crystal 9 Grow.
- the bottom of the chamber 1 is provided with a heat insulating bottom 8 that is also formed of a heat insulating material.
- a hole 8 a through which the crucible shaft 2 is passed is formed at the center position of the heat insulating bottom 8.
- exhaust ports 8 b are formed at four locations at equal intervals along the circumferential direction of the heat insulating bottom 8.
- the exhaust port 8b is provided to exhaust the gas in the furnace described later.
- annular plate-like heat insulating member 13 which is also made of a heat insulating material is provided.
- An upper end of the radiation screen 10 is connected to the heat insulating member 13.
- the radiant screen 10 is a heat shield surrounding the single crystal pulling region, and is a conical or cylindrical member in which the diameter of the lower end opening is smaller than the diameter of the upper end opening.
- the radiant screen 10 blocks the radiant heat applied to the single crystal 9 from the melt 4, the quartz crucible 5 and the like to accelerate the cooling of the single crystal 9, thereby increasing the single crystal pulling speed and generating crystal defects. To prevent.
- the radiant screen 10 guides an inert gas (Ar gas) introduced from above the chamber 1 to the periphery of the single crystal 9, and passes through the peripheral portion from the center of the quartz crucible 5 to the exhaust port at the bottom of the chamber. Generated from melt 4 by forming a gas flow up to 8b It has a function to eliminate evaporants and reaction products that inhibit single crystallization such as SiO.
- the inner peripheral surface of the heat insulating cylinder 7 is covered with a cylindrical heat shield 12 made of a heat insulating material.
- This heat-sinored 12 corresponds to the outer cylinder 12 described in the prior art in FIG.
- the heat-sinored 12 is made of, for example, carbon or carbon fiber reinforced carbon.
- the heat shield 12 may be provided in close proximity to the inner peripheral surface of the heat insulating cylinder 7 or close thereto.
- an exhaust pipe 20 made of a material having good thermal conductivity is further provided between the heater 6 and the heat sink 12.
- a plurality (four) of exhaust pipes 20 are provided so as to communicate with a plurality (four) of exhaust ports 8b formed in the heat insulating bottom 8 at the bottom of the chamber 1, respectively.
- the exhaust pipe 20 is a cylindrical member whose upper end is located above the heater 6 and whose lower end is located at the exhaust port 8b of the heat insulating bottom 8, and is located outside the heater 6. It is located inside the heat shield 12.
- the cross section of the exhaust pipe 20 (exhaust passage cross section) is formed in a rectangular shape, for example.
- the exhaust pipe 20 is provided at a predetermined distance from the heater 6 and at a predetermined distance from the heat shield 12.
- the exhaust pipe 20 is made of a heat-resistant material with relatively good thermal conductivity, such as graphite, carbon fiber reinforced carbon, or ceramics.
- the upper end of the exhaust pipe 20 is supported by the heat shield 12 via the exhaust pipe fixing ring 21 and the lower end is supported by the support member 22.
- an annular plate-like exhaust pipe fixing ring 21 formed so as to cover the upper end of the heater 6 is provided above the heater 6.
- the outer periphery of the exhaust pipe fixing ring 21 is fixed to the heat shield 12, and a graphite crucible 3 (quartz crucible 5) is located in the central hole of the exhaust pipe fixing ring 21.
- the exhaust pipe fixing ring 21 is formed with a rectangular hole 21 a corresponding to the outer shape of the exhaust pipe 20. By passing the exhaust pipe 20 through the rectangular hole 21a, the upper end of the exhaust pipe 20 is supported by the heat shield 21 via the exhaust pipe fixing ring 21, and the top of the exhaust pipe 20 is The end is fixed in chamber 1.
- the outer surface of the heat insulating bottom 8 is covered with a disk-like support member 22.
- the support member 22 has four exhaust holes 22b at positions corresponding to the four exhaust ports 8b described above.
- a rectangular flange 22a corresponding to the outer shape of the exhaust pipe 20 is formed around the exhaust hole 22b.
- the rectangular flange 22a is inserted into the exhaust port 8b, and the lower end portion of the exhaust pipe 20 is fitted into the flange 22a, whereby the lower end portion of the exhaust pipe 20 is supported by the support member 22,
- the lower end of the exhaust pipe 20 is fixed in the chamber 1.
- the exhaust passage sectional area of the exhaust pipe 20 is set to be the same as the area of the exhaust hole 22b.
- the cross-sectional area of the exhaust pipe in the present invention is preferably larger than the cross-sectional area of the exhaust port in order to reduce pressure loss, but the exhaust port cross-sectional area depends on the pump capacity, furnace pressure, and gas flow rate. It's smaller and better.
- an inert gas (Ar gas) flows from the upper part of the chamber 1 into the chamber.
- Ar gas flows down to the outer peripheral surface of the single crystal 9 as shown by an arrow gl in FIG. 1, passes through the gap between the lower end of the radiation screen 10 and the melt 4, and then rises along the inner surface of the quartz crucible 5. To do. Then, it flows down in the exhaust pipe 20 as indicated by an arrow g2, and is discharged out of the chamber 1 through an exhaust hole 22b (exhaust port 8b) as indicated by an arrow g3.
- the exhaust pipe 20 has an upper end opening located above the upper end of the heater 6 and a lower end opening communicating with the exhaust outlet 8b. Therefore, Ar gas is introduced into the graphite crucible 3 and the heater 6. It flows only inside the exhaust pipe 20, which is almost touching. For this reason, similar to the conventional technology described in FIG. 9, the graphite crucible 3 and the heater 6 are avoided from being made of SiC, and the service life can be greatly extended.
- the exhaust pipe 20 of the present embodiment is provided between the heater 6 and the heat sink 12 and is made of a material having good thermal conductivity. It is kept at a high temperature, and the exhaust force does not go around the heat shield 12 directly. That is, in the case of the prior art described in FIG. 9, since the heat shield 12 itself constitutes the outer cylinder of the exhaust pipe, the temperature of the exhaust pipe itself is low, and the outer cylinder 12 has evaporated and reaction products. Will adhere and condense easily. In the experiment, the outer cylinder 12 is a place where evaporants and reaction products are likely to adhere. Was confirmed to be 1600K. Furthermore, it was confirmed that the outer cylinder 12 would be less than 1500K at a depth of 10mm.
- the heat generated by the heater 6 directly goes around the exhaust pipe 20 and is maintained at a high temperature.
- the temperature of the exhaust pipe 20 was maintained before and after 1800K. For this reason, the adhering and condensing of evaporates and reaction products to the exhaust pipe 20 are avoided. Therefore, according to the present embodiment, clogging of the exhaust pipe 20 is prevented. Further, the exhaust pipe 20 is prevented from being made of SiC. For this reason, it is possible to lengthen the time until the exhaust pipe 20 is replaced, and to reduce the cost.
- the exhaust gas hardly comes into contact with the heat shield 12, so that the heat shield 12 is prevented from being made of SiC.
- the time until the heat shield 12 is replaced can be lengthened, and the cost can be reduced.
- the distance between the lower end position of the radiation screen 10 supported by the heat shield 12 and the melt surface can be initially maintained at the set value and pulled up.
- the single crystal 9 can be maintained in high quality and the product yield can be improved.
- the exhaust pipe 20 of the embodiment is a small-diameter, small-sized member formed in a cylindrical shape with a small cross-sectional area that communicates with the exhaust port 8b (exhaust port 22b) having a relatively small area.
- a hook member 20 a having an L-shaped cross section is formed at the upper end portion of the exhaust pipe 20, and the hook member 20 a is engaged with the upper end of the heater 6.
- the exhaust pipe 20 is fixed in the chamber 1.
- the force with which the exhaust pipe 20 is in contact with the heater 6, and the exhaust pipe 20 is supported by the heater 6 via a non-conductive member, for example, without bringing the exhaust pipe 20 into contact with the heater 6. It is good also as a structure to be held.
- a hook member 20b having an L-shaped cross section is formed at the upper end portion of the exhaust pipe 20, and the hook member 20b is formed on the hook receiving member 12a having an L-shaped cross section formed on the heat shield 12.
- the exhaust pipe 20 is supported by the heat shield 12, and the exhaust pipe 20 is fixed in the chamber 1.
- the side surface of the exhaust pipe 20 is separated from the inner peripheral surface of the heat shield 12. However, the side surface of the exhaust pipe 20 is disposed so as to contact the inner peripheral surface of the heat shield 12. Moyore.
- both guide members 12b, 12c having a cross-section of a cross-section are provided intermittently along the longitudinal direction of the exhaust pipe 20, and as indicated by arrow C, each guide member 12b, 12c During this time, the exhaust pipe 20 is passed through and engaged with the guide members 12 b and 12 c, so that the exhaust pipe 20 is supported by the heat shield 12 and fixed in the chamber 1.
- both guide members 12d and 12e having a cross-sectional shape of a cross-section are formed continuously along the longitudinal direction of the exhaust pipe 20, and as indicated by an arrow D, the guide members 12d and 12e The exhaust pipe 20 is inserted therebetween and engaged with the guide members 12d and 12e, whereby the exhaust pipe 20 is supported by the heat shield 12 and fixed in the chamber 1.
- the exhaust pipe 20 may be structured so as to be divided into two parts, as shown in FIGS. 6 and 7, so that the upper part and the lower part can be replaced.
- FIG. 6 shows a perspective view of a cylindrical exhaust pipe 20 that can be divided into an upper exhaust pipe 20U and a lower exhaust pipe 20L.
- a fitting recess 20La is formed at the upper end of the lower exhaust pipe 20L, and a fitting projection 20Ua that can be fitted into the fitting recess 2 OLa at the lower end of the upper exhaust pipe 20U.
- the upper exhaust pipe 20U and the lower exhaust pipe 20L are connected to each other in such a manner that the upper exhaust pipe 20U and the lower exhaust pipe 20L can be divided into Fixed.
- FIG. 7 is a longitudinal sectional view showing a cylindrical exhaust pipe 20 having a two-divided structure of an upper exhaust pipe 20U and a lower exhaust pipe 20L.
- a flange 20Lb that can fit the lower end of the upper exhaust pipe 20U is formed at the upper end of the lower exhaust pipe 20L.
- FIGS. 6 and 7 illustrate the exhaust pipe 20 having a two-divided structure, but the exhaust pipe 20 may be divided into three or more. In any case, it is desirable that the dividing position is in a temperature range where no evaporant or reaction product is attached or condensed.
- the exhaust pipe 20 has been illustrated with a cross-sectional shape of a rectangular shape (Fig. 1) and a circular shape (Figs. 6 and 7).
- Fig. 1 a rectangular shape
- Figs. 6 and 7 a circular shape
- the present invention is not limited to these shapes. It can also be a cross-sectional shape.
- the case where the exhaust passage cross-sectional area of the exhaust pipe 20 is approximately the same area as the exhaust hole 22b (exhaust port 8b) at the bottom of the chamber 1 is exemplified, but the pressure loss is reduced.
- the total of the exhaust passage cross-sectional areas of the plurality of exhaust pipes 20 is larger than the total area of the plurality of exhaust holes 22b (exhaust ports 8b) of the chamber 1, which is more desirable.
- the number of force exhaust pipes 20 exemplifying the case where a plurality of exhaust pipes 20 are provided along the circumferential direction of the heat insulating bottom 8 is equal to the number of exhaust holes 22b (exhaust holes It can be set arbitrarily according to the number of ports 8b).
- the plurality of exhaust pipes 20 necessarily correspond to the plurality of exhaust holes 22b on the bottom of the chamber 1 in a one-to-one correspondence, and the number of exhaust holes 22b is less than the number of exhaust pipes 20 that do not need to communicate with each other.
- the number of exhaust holes 22b may be smaller than the number of exhaust pipes 20.
- two exhaust pipes 20 may be assembled to communicate with one exhaust hole 22b, or one exhaust pipe 20 may be branched to communicate with two exhaust holes 22b. Good.
- the length of the exhaust pipe 20 in the circumferential direction can also be set to an arbitrary length. Further, in the above description, it is assumed that a plurality of exhaust pipes 20 are intermittently provided in the circumferential direction of the heat insulating bottom 8, but the exhaust pipe 20 is formed in a ring shape (continuously) along the circumferential direction of the heat insulating bottom 8. May be formed).
- the exhaust pipe 20 is arranged to be separated from the heat sink 12 and the heater 6.
- the exhaust pipe 20 is connected to one or both of the heat sink 12 and the heater 6. Let it be placed in contact.
- the present invention is not limited to the configuration shown in FIG. As long as a plurality of exhaust pipes 20 are provided on the outside of the heater 6 along the circumferential direction of the heater 6, any configuration can be used.
- FIG. 10 is top views corresponding to FIG. 1 (b).
- a plurality of exhaust pipes 20 are provided along the circumferential direction of the heater 6 between the heater 6 and the heat sink 12, and the plurality of exhaust pipes 20 are connected to the heater 6. You may provide in the position which contacts.
- the plurality of exhaust pipes 20 may be exhaust pipes 20 having partition walls independent of the heat shield 12, or may be exhaust pipes 20 sharing the heat shield 12 and partition walls.
- a plurality of exhaust pipes 20 are provided along the circumferential direction of the heater 6 between the heater 6 and the heat sink 12, and the plurality of exhaust pipes 20 are An exhaust pipe having a partition wall shared with the heat shield 12 may be used.
- a plurality of exhaust pipes 20 are provided outside the heat shield 12 along the circumferential direction of the heat shield 12, and the plurality of exhaust pipes 20 are shared with the heat shield 12. You may comprise with the exhaust pipe which has a partition used.
- the semiconductor single crystal manufacturing method of the present invention since the change in the coefficient of thermal expansion of the heat shield 12 can be suppressed, the distance between the lower end position of the radiation screen 10 and the melt surface is initially maintained at a set value. As a result, high-quality single crystals can be stably pulled up and manufactured, and the service life of the parts used can be greatly extended, so the production costs of single crystals can be kept low.
- the present invention is based on a melt in which a dopant such as phosphorus, arsenic, and antimony is added at a high concentration.
- the dopant evaporation is deposited on the in-furnace component and causes crystal defects.
- compound-based and oxide-based crystals can be grown using the Tyoklalsky method, where evaporates accumulate on or deteriorate the components in the furnace. Oh, it ’s a power S to apply.
- FIG. 1 is a cross-sectional view showing a configuration of a silicon single crystal manufacturing apparatus according to an embodiment, FIG. 1 (a) is a side view, and FIG. 1 (b) is a top view.
- FIG. 2 is a diagram illustrating an exhaust pipe fixing method.
- FIG. 3 is a diagram illustrating an exhaust pipe fixing method.
- FIG. 4 is a diagram illustrating an exhaust pipe fixing method.
- FIG. 5 is a diagram illustrating an exhaust pipe fixing method.
- FIG. 6 is a perspective view illustrating the structure of an exhaust pipe that can be divided into two parts, upper and lower.
- FIG. 7 is a vertical cross-sectional view illustrating the structure of an exhaust pipe that can be divided into two parts, upper and lower.
- FIG. 8 is a diagram for explaining the prior art.
- FIG. 9 is a diagram for explaining the prior art.
- FIG. 10 is a diagram showing another embodiment.
- FIG. 11 is a diagram showing another embodiment.
- FIG. 12 is a diagram showing another embodiment.
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Abstract
Description
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Priority Applications (2)
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EP05816745.3A EP1840248B1 (en) | 2004-12-13 | 2005-12-13 | Semiconductor single crystal producing device and producing method |
US11/792,664 US8753446B2 (en) | 2004-12-13 | 2005-12-13 | Semiconductor single crystal production device and producing method therefor |
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JP2004-360094 | 2004-12-13 | ||
JP2004360094A JP4730937B2 (ja) | 2004-12-13 | 2004-12-13 | 半導体単結晶製造装置および製造方法 |
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US (1) | US8753446B2 (ja) |
EP (1) | EP1840248B1 (ja) |
JP (1) | JP4730937B2 (ja) |
KR (1) | KR101216313B1 (ja) |
TW (1) | TWI281521B (ja) |
WO (1) | WO2006064797A1 (ja) |
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CN103334153A (zh) * | 2013-06-26 | 2013-10-02 | 英利能源(中国)有限公司 | 一种单晶炉 |
CN105525342A (zh) * | 2015-12-22 | 2016-04-27 | 英利集团有限公司 | 一种直拉法制备大尺寸单晶硅棒的方法及单晶炉 |
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PL1983284T3 (pl) * | 2006-02-10 | 2013-12-31 | Ngk Insulators Ltd | Sposób wyprowadzania gazu z pieca przelotowego i struktura wyprowadzająca gaz |
US9664448B2 (en) * | 2012-07-30 | 2017-05-30 | Solar World Industries America Inc. | Melting apparatus |
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JP6257483B2 (ja) | 2014-09-05 | 2018-01-10 | グローバルウェーハズ・ジャパン株式会社 | シリコン単結晶製造方法 |
US10378121B2 (en) * | 2015-11-24 | 2019-08-13 | Globalwafers Co., Ltd. | Crystal pulling system and method for inhibiting precipitate build-up in exhaust flow path |
US10487418B2 (en) | 2016-01-06 | 2019-11-26 | Globalwafers Co., Ltd. | Seed chuck assemblies and crystal pulling systems for reducing deposit build-up during crystal growth process |
JP6881214B2 (ja) * | 2017-10-16 | 2021-06-02 | 株式会社Sumco | シリコン単結晶の製造方法 |
JP6922831B2 (ja) * | 2018-04-27 | 2021-08-18 | 株式会社Sumco | シリコン単結晶の製造方法およびシリコン単結晶の引き上げ装置 |
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CN110592660A (zh) * | 2019-09-11 | 2019-12-20 | 上海新昇半导体科技有限公司 | 一种晶体生长装置 |
CN113755944A (zh) * | 2020-06-05 | 2021-12-07 | 西安奕斯伟材料科技有限公司 | 一种单晶炉热场结构、单晶炉及晶棒 |
CN112144105A (zh) * | 2020-09-24 | 2020-12-29 | 西安奕斯伟硅片技术有限公司 | 一种组合排气管和单晶炉 |
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CN105525342A (zh) * | 2015-12-22 | 2016-04-27 | 英利集团有限公司 | 一种直拉法制备大尺寸单晶硅棒的方法及单晶炉 |
Also Published As
Publication number | Publication date |
---|---|
KR101216313B1 (ko) | 2012-12-27 |
EP1840248A4 (en) | 2009-07-01 |
EP1840248A1 (en) | 2007-10-03 |
JP2006169010A (ja) | 2006-06-29 |
KR20070086546A (ko) | 2007-08-27 |
US20080110394A1 (en) | 2008-05-15 |
US8753446B2 (en) | 2014-06-17 |
TWI281521B (en) | 2007-05-21 |
TW200628641A (en) | 2006-08-16 |
JP4730937B2 (ja) | 2011-07-20 |
EP1840248B1 (en) | 2015-02-18 |
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