WO2022249571A1 - 石英ガラスルツボ及びその製造方法並びにシリコン単結晶の製造方法 - Google Patents
石英ガラスルツボ及びその製造方法並びにシリコン単結晶の製造方法 Download PDFInfo
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- WO2022249571A1 WO2022249571A1 PCT/JP2022/005166 JP2022005166W WO2022249571A1 WO 2022249571 A1 WO2022249571 A1 WO 2022249571A1 JP 2022005166 W JP2022005166 W JP 2022005166W WO 2022249571 A1 WO2022249571 A1 WO 2022249571A1
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- Prior art keywords
- crucible
- coating film
- quartz glass
- crystallization accelerator
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 188
- 239000013078 crystal Substances 0.000 title claims abstract description 120
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 112
- 239000010703 silicon Substances 0.000 title claims abstract description 112
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000000576 coating method Methods 0.000 claims abstract description 190
- 239000011248 coating agent Substances 0.000 claims abstract description 189
- 238000002425 crystallisation Methods 0.000 claims abstract description 146
- 230000008025 crystallization Effects 0.000 claims abstract description 146
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 58
- 229910052799 carbon Inorganic materials 0.000 claims description 58
- 125000004429 atom Chemical group 0.000 claims description 51
- 239000007788 liquid Substances 0.000 claims description 46
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 20
- 239000000758 substrate Substances 0.000 claims description 20
- 239000002904 solvent Substances 0.000 claims description 17
- 229910052788 barium Inorganic materials 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 10
- 230000003746 surface roughness Effects 0.000 claims description 10
- 238000009835 boiling Methods 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 229910052712 strontium Inorganic materials 0.000 claims description 6
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 230000001737 promoting effect Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 61
- 239000000843 powder Substances 0.000 description 30
- 239000002994 raw material Substances 0.000 description 20
- 239000007789 gas Substances 0.000 description 18
- 239000010453 quartz Substances 0.000 description 18
- 230000002829 reductive effect Effects 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 13
- 238000002844 melting Methods 0.000 description 11
- 230000008018 melting Effects 0.000 description 11
- 239000000377 silicon dioxide Substances 0.000 description 11
- 238000011156 evaluation Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 238000005755 formation reaction Methods 0.000 description 8
- 230000001965 increasing effect Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 7
- 239000000155 melt Substances 0.000 description 7
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 239000012298 atmosphere Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000004031 devitrification Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 4
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 3
- 229910001863 barium hydroxide Inorganic materials 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- IUVCFHHAEHNCFT-INIZCTEOSA-N 2-[(1s)-1-[4-amino-3-(3-fluoro-4-propan-2-yloxyphenyl)pyrazolo[3,4-d]pyrimidin-1-yl]ethyl]-6-fluoro-3-(3-fluorophenyl)chromen-4-one Chemical compound C1=C(F)C(OC(C)C)=CC=C1C(C1=C(N)N=CN=C11)=NN1[C@@H](C)C1=C(C=2C=C(F)C=CC=2)C(=O)C2=CC(F)=CC=C2O1 IUVCFHHAEHNCFT-INIZCTEOSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000005350 fused silica glass Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical group [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010314 arc-melting process Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 150000001553 barium compounds Chemical class 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical group 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000001175 rotational moulding Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- -1 silicon alkoxide Chemical class 0.000 description 1
- 239000005049 silicon tetrachloride Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 229910021489 α-quartz Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/09—Other methods of shaping glass by fusing powdered glass in a shaping mould
- C03B19/095—Other methods of shaping glass by fusing powdered glass in a shaping mould by centrifuging, e.g. arc discharge in rotating mould
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/001—General methods for coating; Devices therefor
- C03C17/003—General methods for coating; Devices therefor for hollow ware, e.g. containers
- C03C17/004—Coating the inside
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/02—Pure silica glass, e.g. pure fused quartz
Definitions
- the present invention relates to a silica glass crucible and its manufacturing method, and more particularly to a silica glass crucible used for pulling silicon single crystals by the Czochralski method (CZ method).
- the present invention also relates to a method for producing a silicon single crystal using such a quartz glass crucible.
- Most of the silicon single crystals are manufactured by the CZ method.
- a polycrystalline silicon raw material is melted in a silica glass crucible to generate a silicon melt, a seed crystal is immersed in the silicon melt, and the seed crystal is gradually pulled up while rotating the silica glass crucible and the seed crystal.
- a large single crystal is grown at the lower end of the seed crystal.
- the CZ method it is possible to increase the yield of large-diameter silicon single crystals.
- a silica glass crucible is a silica glass container that holds silicon melt during the silicon single crystal pulling process. Therefore, quartz glass crucibles are required to have high durability so as to withstand long-term use without being deformed at high temperatures equal to or higher than the melting point of silicon. In addition, high purity is required to prevent impurity contamination of the silicon single crystal.
- brown rings grow on the inner surface of the quartz glass crucible that comes into contact with the silicon melt when the silicon single crystal is pulled. If the brown ring is separated from the crucible surface and mixed into the silicon melt, it may be transported to the solid-liquid interface on the melt convection and incorporated into the single crystal. It causes dislocation. Therefore, a crystallization accelerator is used to actively crystallize the inner surface of the crucible to prevent the peeling of the crystal pieces.
- Patent Document 1 describes a devitrification agent for crucibles with improved efficiency compared to conventional methods.
- the devitrification agent which includes barium and tantalum, tungsten, germanium, tin, or a combination of two or more thereof, is dissolved into the crucible during construction, applied to the final crucible surface, and/or Or it is added to the silicon melt used for crystal pulling.
- Patent Document 2 describes a surface-treated crucible with improved dislocation-free performance.
- the crucible includes first and second devitrification accelerators distributed on the inner and outer surfaces, respectively, of the side wall formations of the body of vitreous silica.
- the first devitrification accelerator is such that when the semiconductor material melts in the crucible during crystal growth, a first layer of substantially devitrified silica is formed on the inner surface of the crucible in contact with the molten semiconductor material. is distributed as
- the second devitrification accelerator is also distributed such that a second layer of substantially devitrified silica forms on the outer surface of the crucible when the semiconductor material melts in the crucible during crystal growth. be.
- Patent Document 3 describes a quartz glass crucible that can withstand a very long single crystal pulling process such as multi-pulling.
- This quartz glass crucible includes a crucible body made of quartz glass, and first and second crystallization accelerator-containing coating films formed on the inner and outer surfaces of the crucible body, respectively.
- the first and second crystallization accelerator-containing coating films contain a polymer, and the crystallization accelerator is a water-insoluble barium compound. Due to the action of the crystallization accelerator, a crystal layer consisting of an aggregate of dome-shaped or columnar crystal grains is formed on the surface layers of the inner and outer surfaces of the crucible body.
- the method of applying the crystallization accelerator is effective in uniformly crystallizing the inner surface of the crucible.
- the crucible is filled with a large amount of polycrystalline silicon lumps, and not only is a considerably large load applied to the bottom surface of the crucible, but also individual silicon lumps are finely crushed during the manufacturing process and have sharp corners. , damage to the coating film of the crystallization accelerator becomes a problem. If part of the coating film of the crystallization accelerator peels off during the time from when the crucible is filled with the polycrystalline silicon raw material until it is completely melted, it is difficult to uniformly crystallize the inner surface of the crucible. Therefore, there is a strong demand for the formation of a coating film that is difficult to peel off.
- an object of the present invention is to provide a silica glass crucible and a method for manufacturing the same, which can prevent peeling of the coating film of the crystallization accelerator and maintain the in-plane distribution of the concentration of the crystallization accelerator as uniform as possible. That's what it is.
- Another object of the present invention is to provide a method for producing a silicon single crystal using such a quartz glass crucible.
- a quartz glass crucible according to the present invention includes a crucible base made of silica glass, and a coating film containing a crystallization accelerator formed on the inner surface of the crucible base, wherein the coating film comprises: It is characterized by having a peel strength of 0.3 kN/m or more.
- the present invention peeling of the coating film of the crystallization accelerator can be prevented. Therefore, the inner surface of the crucible base can be uniformly crystallized during the single crystal pulling process, and the generation of dislocations and pinholes in the silicon single crystal can be prevented to increase the yield.
- the concentration of the crystallization accelerator is 2.5 ⁇ 10 15 atoms/cm 2 or less, and the peel strength of the coating film is 0.6 kN/m or more. If the coating film has a peel strength of 0.6 kN/m or more, the inner surface of the crucible base is uniformly crystallized even if the concentration of the crystallization accelerator is 2.5 ⁇ 10 15 atoms/cm 2 or less. can be made
- the concentration of the crystallization accelerator is preferably higher than 2.5 ⁇ 10 15 atoms/cm 2 .
- the concentration of the crystallization accelerator is higher than 2.5 ⁇ 10 15 atoms/cm 2 , even if part of the coating film is peeled off due to the low peeling strength of the coating film, the strong crystallization accelerator is removed. Due to the action, crystallization also progresses in the lateral direction, making it possible to crystallize the peeled portion. Therefore, the inner surface of the crucible base can be uniformly crystallized.
- the range of the coating film on the bottom of the crucible base is preferably in the range of 0.25 to 1 times the outer diameter of the crucible.
- the peel strength of the coating film formed within a range of 0.5 times or less the outer diameter of the crucible base from the center of the bottom is 0.9 kN/m or more.
- the crystallization accelerator is preferably a water-soluble compound of group 2a elements (Mg, Ca, Sr, Ba) having no carbon atoms in the molecule.
- group 2a elements Mg, Ca, Sr, Ba
- the carbon concentration in the coating film can be reduced, and the carbon contamination of the silicon single crystal can be reduced.
- the solubility in water is high and the aqueous solution can be easily handled, it is possible to easily realize uniform application of the crystallization accelerator to the crucible surface.
- the thickness of the coating film is preferably 0.1 ⁇ m or more and 50 ⁇ m or less. Thereby, a uniform coating film can be formed on the inner surface of the crucible base.
- the surface roughness (Ra) of the coating film is preferably 0.1 ⁇ m or more and 0.25 ⁇ m or less. As a result, peeling of the coating film can be prevented, and the inner surface of the crucible base can be uniformly crystallized.
- the average carbon concentration in the range of 0 ⁇ m or more and 300 ⁇ m or less in depth from the inner surface of the coating film and the crucible base is preferably 1.0 ⁇ 10 12 atoms/cc or more and 3.0 ⁇ 10 19 atoms/cc or less. .
- the concentration of carbon not only in the vicinity of the inner surface of the crucible base but also in the coating film containing the crystallization accelerator is reduced, so that the amount of carbon taken into the silicon single crystal can be reduced. .
- the average carbon concentration in the coating film is preferably 3.0 ⁇ 10 18 atoms/cc or less. This makes it possible to further reduce the amount of carbon taken into the silicon single crystal.
- the average carbon concentration in the coating film can be measured by SIMS (Secondary Ion Mass Spectrometry).
- the method for producing a silica glass crucible according to the present invention includes the steps of producing a crucible substrate made of silica glass, and spraying a coating liquid containing a crystallization accelerator onto the inner surface of the crucible substrate.
- the average droplet diameter is 5 ⁇ m or more and 1000 ⁇ m or less using a two-fluid nozzle that mixes and sprays gas and liquid at the spray tip.
- the crystallization accelerator can be uniformly applied while preventing the coating liquid from dripping on the crucible surface. Therefore, a uniform coating film can be formed on the inner surface of the crucible substrate, and the peel strength of the coating film can be increased.
- the maximum thickness of the coating film formed by one coating is set to 0.5 ⁇ m or less, and drying and recoating of the coating film are alternately repeated. It is preferable to form the coating film in multiple layers. As a result, a dense and uniform coating film can be formed, and the peel strength of the coating film can be increased.
- the spray amount of the coating liquid is preferably 300 mL/min or less.
- the spray amount of the coating liquid is preferably 300 mL/min or less.
- the crystallization accelerator is preferably a water-soluble compound of group 2a elements (Mg, Ca, Sr, Ba) having no carbon atoms in the molecule.
- group 2a elements Mg, Ca, Sr, Ba
- the carbon concentration in the coating film can be reduced, and the carbon contamination of the silicon single crystal can be reduced.
- the solubility in water is high and the aqueous solution can be easily handled, it is possible to easily realize uniform application of the crystallization accelerator to the crucible surface.
- the coating liquid is preferably sprayed while heating the crucible substrate at a temperature of 60° C. or higher and 500° C. or lower, and heating at a temperature of 100° C. or higher and 180° C. or lower is particularly preferred. preferable.
- the coating liquid is preferably sprayed while heating the crucible base so that the temperature difference between the boiling point of the solvent in the coating liquid and the crucible base is ⁇ 40.0° C. or more and 100° C. or less. It is more preferable to set the heating temperature of the crucible base to the boiling point of the solvent or higher and 80° C. or lower. As a result, the carbon concentration in the coating film can be reduced by suppressing the generation of carbonate.
- the step of spraying the coating liquid is preferably performed under a low vacuum of 1 ⁇ 10 2 Pa or more and 1 ⁇ 10 5 Pa or less.
- a low vacuum of 1 ⁇ 10 2 Pa or more and 1 ⁇ 10 5 Pa or less.
- the method for producing a silicon single crystal according to the present invention is characterized by pulling a silicon single crystal by the CZ method using the quartz glass crucible according to the present invention. According to the present invention, it is possible to prevent a decrease in yield due to dislocations in a silicon single crystal.
- the present invention it is possible to provide a silica glass crucible in which the coating film of the crystallization accelerator is not easily peeled off, and a method for manufacturing the same. Moreover, according to the present invention, it is possible to provide a method for producing a silicon single crystal using such a quartz glass crucible.
- FIG. 1 is a schematic perspective view showing the configuration of a quartz glass crucible according to an embodiment of the invention.
- FIG. 2 is a schematic side sectional view and a partially enlarged view of the quartz glass crucible shown in FIG.
- FIG. 3 is a schematic diagram showing a method for measuring the peel strength of a coating film.
- FIG. 4 is a schematic plan view showing measurement positions of the carbon concentration at the bottom of the crucible.
- FIG. 5 is a schematic diagram showing a method for manufacturing a silica glass crucible by a rotating mold method.
- FIG. 6 is a schematic diagram showing a method of applying a crystallization accelerator to the inner surface of the crucible base.
- FIG. 7 is a diagram for explaining the single crystal pulling process using the quartz glass crucible according to the present embodiment, and is a schematic cross-sectional view showing the configuration of the single crystal pulling apparatus.
- FIG. 1 is a schematic perspective view showing the configuration of a silica glass crucible according to an embodiment of the invention.
- 2 is a schematic side cross-sectional view and a partially enlarged view of the quartz glass crucible shown in FIG.
- the silica glass crucible 1 is a silica glass container for holding a silicon melt, and is provided with a cylindrical side wall portion 10a and a It has a bottom portion 10b and a corner portion 10c provided between the side wall portion 10a and the bottom portion 10b.
- the bottom portion 10b preferably has a so-called round bottom that is gently curved, but it may have a so-called flat bottom.
- the corner portion 10c is a portion having a larger curvature than the bottom portion 10b.
- the aperture (diameter) of the quartz glass crucible 1 varies depending on the diameter of the silicon single crystal ingot pulled from the silicon melt, but is 18 inches (approximately 450 mm) or more, preferably 22 inches (approximately 560 mm), and 32 inches (approximately 800 mm) or more is particularly preferred. This is because such a large crucible is used for pulling a large silicon single crystal ingot having a diameter of 300 mm or more, and is required not to affect the quality of the single crystal even when used for a long period of time.
- the thickness of the crucible varies slightly depending on its location, but the thickness of the side wall 10a of the crucible of 18 inches or more is 6 mm or more, the thickness of the side wall 10a of the crucible of 22 inches or more is 7 mm or more, and the thickness of the crucible of 32 inches or more.
- the thickness of the side wall portion 10a is preferably 10 mm or more.
- the quartz glass crucible 1 includes a crucible base 10 made of silica glass and a coating film 13 of a crystallization accelerator formed on the inner surface 10i of the crucible base 10 .
- the crucible substrate 10 mainly has a two-layer structure, and has a transparent layer 11 (non-bubble layer) containing no bubbles and a bubble layer 12 (opaque layer) containing many fine bubbles, and the coating film 13 is It is provided inside the transparent layer 11 .
- the transparent layer 11 is a layer that constitutes the inner surface 10i of the crucible base 10 that comes into contact with the silicon melt, and is provided to prevent the yield of silicon single crystals from decreasing due to air bubbles in the silica glass. ing. Since the inner surface 10i of the crucible reacts with the silicon melt and melts away, the bubbles in the vicinity of the inner surface of the crucible cannot be confined in the silica glass, and the bubbles burst due to thermal expansion, resulting in crucible fragments (silica fragments). ) may peel off. When crucible fragments released into the silicon melt are transported to the growth interface of the silicon single crystal by melt convection and incorporated into the silicon single crystal, they cause dislocations in the single crystal. In addition, if bubbles released into the silicon melt float and reach the solid-liquid interface and are taken into the single crystal, they cause pinholes in the silicon single crystal.
- the transparent layer 11 does not contain air bubbles
- the air bubble content and air bubble size are such that the single crystallization rate does not decrease due to air bubbles.
- Such a bubble content is, for example, 0.1 vol % or less
- the bubble diameter is, for example, 100 ⁇ m or less.
- the transparent layer 11 preferably has a thickness of 0.5 to 10 mm. set to thickness.
- the transparent layer 11 is preferably provided over the entire crucible from the crucible side wall 10a to the bottom 10b. be.
- the bubble layer 12 is a main layer of the crucible substrate 10 located outside the transparent layer 11, and enhances heat retention of the silicon melt in the crucible, and disperses radiant heat from the heater of the single crystal pulling apparatus. It is provided to heat the silicon melt in the crucible as uniformly as possible. Therefore, the bubble layer 12 is provided over the entire crucible from the side wall portion 10a to the bottom portion 10b.
- the bubble content rate of the bubble layer 12 is higher than that of the transparent layer 11, preferably larger than 0.1 vol% and 5 vol% or less. This is because if the bubble content of the bubble layer 12 is 0.1 vol % or less, the bubble layer 12 cannot exhibit the required heat retention function. Moreover, if the bubble content of the bubble layer 12 exceeds 5 vol %, the crucible may be deformed due to thermal expansion of the bubbles, and the yield of the single crystal may be lowered. From the viewpoint of the balance between heat retention and heat transfer, the bubble content of the bubble layer 12 is particularly preferably 1 to 4 vol %.
- the above-mentioned bubble content rate is a value obtained by measuring the crucible before use under a room temperature environment.
- the crucible base 10 preferably has a two-layer structure of a synthetic silica glass layer (synthetic layer) made of synthetic silica powder and a natural silica glass layer (natural layer) made of natural silica powder.
- Synthetic quartz powder can be produced by vapor-phase oxidation of silicon tetrachloride (SiCl 4 ) (dry synthesis method) or hydrolysis of silicon alkoxide (sol-gel method).
- Natural quartz powder is produced by pulverizing natural minerals containing ⁇ -quartz as a main component into granules.
- a two-layer structure of a synthetic silica glass layer and a natural silica glass layer is obtained by depositing natural silica powder along the inner surface of a mold for manufacturing crucibles, depositing synthetic silica powder on top of this, and heating these layers by Joule heat generated by arc discharge. It can be produced by melting raw quartz powder.
- the transparent layer 11 is formed by removing air bubbles by strongly vacuuming the deposited layer of the raw material quartz powder from the outside, and the air bubble layer 12 is formed by stopping or weakening the vacuum.
- the interface between the synthetic silica glass layer and the natural silica glass layer does not necessarily coincide with the interface between the transparent layer 11 and the bubble layer 12, but the synthetic silica glass layer, like the transparent layer 11, It is preferable to have a thickness that does not completely disappear due to erosion of the inner surface of the crucible during the single crystal pulling process.
- the quartz glass crucible 1 has a configuration in which the inner surface 10i of the crucible base 10 is covered with a coating film 13 of a crystallization accelerator.
- the crystallization accelerator is a compound of Group 2a elements (Mg, Ca, Sr, Ba) and plays a role in promoting crystallization of the inner surface 10i of the crucible base 10 during the single crystal pulling process.
- the crystallization accelerator is preferably a hydroxide or oxide having no carbon atoms in the molecule, and particularly preferably a hydroxide that is highly soluble in water and easy to handle.
- Barium (Ba) is particularly preferable as the Group 2a element as the crystallization accelerator. This is because barium has a smaller segregation coefficient than silicon, is stable at room temperature, and is easy to handle. In addition, barium has the advantage that the crystallization speed does not decrease with crystallization, and it induces oriented growth more strongly than other elements.
- the coating film 13 of the crystallization accelerator is formed in a range of 0.25 to 1 times the outer diameter of the crucible.
- the coating film 13 of the crystallization accelerator is preferably formed on the entire inner surface 10i of the crucible base body 10 excluding the vicinity of the upper end of the rim.
- the reason for excluding the vicinity of the upper end of the rim is that the vicinity of the upper end of the rim does not come into contact with the silicon melt and does not necessarily need to be crystallized. This is because the crystal pieces cause dislocations in the silicon single crystal.
- the thickness of the coating film 13 is not particularly limited, it is preferably 0.1 to 50 ⁇ m, particularly preferably 1 to 20 ⁇ m. This is because if the thickness of the coating film 13 is too thin, the peeling strength of the coating film is weak, and the peeling of the coating film 13 causes uneven crystallization. If the coating film 13 is too thick, the peel strength will be lowered and the crystallization will be non-uniform.
- the coating film 13 does not peel off, and for that purpose a peel strength of 0.3 kN/m or more is required.
- the coating film 13 needs to satisfy such peel strength at least in the bottom central region of the crucible substrate 10, and preferably satisfies such peel strength over the entire region where the coating film 13 is formed.
- the central region of the bottom of the crucible base 10 means a region within a range of 0.5r (r is the outer diameter (radius) of the crucible) from the center of the bottom of the crucible base 10 .
- FIG. 3 is a schematic diagram showing a method for measuring the peel strength of the coating film 13.
- the peel strength of the coating film 13 can be measured using a SAICAS (Surface And Interfacial Cutting Analysis System) 30 .
- the SAICAS 30 can obtain the assumed shear strength from the vertical load F Z (vertical force) and the horizontal load F Y (horizontal force) when the diamond blade 31 obliquely cuts the film, The peel strength can be obtained from the horizontal load F Y (horizontal force) when parallel cutting is performed on the interface with .
- the peel strength of the coating film 13 was measured by placing a crucible piece sample 1 s on which the coating film 13 was formed on a stage and measuring the interface between the coating film 13 and the crucible base 10 (the inner surface 10 i of the crucible base 10 ) with the diamond blade 31 . can be obtained from the horizontal load F Y when cutting .
- the concentration of the crystallization accelerator contained in the coating film 13 is preferably 2.5 ⁇ 10 15 atoms/cm 2 or more.
- concentration of the crystallization accelerator is relatively high, even if a part of the crystallization accelerator is peeled off, the crystallization is promoted in the surface direction, and the inner surface 10i of the crucible base 10 is uniformly formed. Crystallization can be achieved.
- the concentration of the crystallization accelerator on the crucible surface is high, the crystallization speed on the crucible surface is high, and crystallization also proceeds in the lateral direction (surface direction), so the required peel strength is higher than when the concentration is low. is also alleviated. Therefore, when the concentration of the crystallization accelerator on the crucible surface is higher than 2.6 ⁇ 10 15 atoms/cm 2 , the peel strength of the crystallization accelerator should be 0.3 kN/m or more.
- the concentration of the crystallization accelerator may be 2.5 ⁇ 10 15 atoms/cm 2 or less, and the peel strength of the coating film 13 in that case is preferably 0.6 kN/m or more.
- the peel strength of the coating film is high, the inner surface 10i of the crucible base 10 can be crystallized reliably without using a high-concentration crystallization accelerator.
- the concentration of the crystallization accelerator on the surface of the crucible is as low as 2.6 ⁇ 10 15 atoms/cm 2 or less, the crystal nuclei of brown rings cannot be uniformly formed when the crystallization accelerator peels off.
- the peel strength of the crystallization accelerator is required to be 0.6 kN/m or more.
- the coating film 13 has a peel strength of 0.9 kN/m or more in the bottom central region of the crucible base body 10 .
- the coating film 13 tends to peel off.
- the coating film 13 on the bottom of the crucible base 10 has a peel strength of 0.9 kN/m or more, peeling can be prevented even when such a large load is applied.
- the surface roughness (Ra) of the coating film 13 is preferably 0.1 ⁇ m or more and 0.25 ⁇ m or less. If the surface roughness (Ra) of the coating film is larger than 0.25 ⁇ m, the coating film is likely to peel off, and it is difficult to make the surface roughness (Ra) of the coating film smaller than 0.1 ⁇ m from the viewpoint of manufacturing. be.
- the carbon concentration in the silicon single crystal grown by the CZ method is as low as possible. It is also necessary to pay attention to the carbon concentration inside. Therefore, in the silica glass crucible 1 according to the present embodiment, the average carbon concentration within the range of 0 ⁇ m to 300 ⁇ m in depth from the coating film 13 and the inner surface 10i of the crucible substrate 10 (that is, the surface layer portion of the crucible substrate 10) is 1.0. x10 12 atoms/cc or more and 3.0 x 10 19 atoms/cc or less. As a result, the amount of carbon dissolved in the silicon melt from the quartz glass crucible 1 can be reduced, making it possible to manufacture a silicon single crystal with a low carbon concentration.
- the average carbon concentration in the coating film 13 is preferably 3.0 ⁇ 10 18 atoms/cc or less. If the average oxygen concentration in the coating film is 3.0 ⁇ 10 18 atoms/cc or less, the amount of carbon supplied from the coating film to the silicon melt can be reduced.
- Both the average carbon concentration in the coating film 13 and the average carbon concentration within the depth range of 0 ⁇ m to 300 ⁇ m from the inner surface of the crucible base 10 are preferably 1.3 ⁇ 10 16 atoms/cc or less. Furthermore, the average carbon concentration within the range of 300 ⁇ m or more and 2000 ⁇ m or less in depth from the inner surface of the crucible substrate 10 is preferably 1.1 ⁇ 10 19 atoms/cc or less. This makes it possible to manufacture a silicon single crystal with a sufficiently low carbon concentration.
- the average carbon density within the range of 300 ⁇ m to 2000 ⁇ m deep from the inner surface of the crucible substrate 10 may be higher than the average carbon density of the surface layer within the range of 0 ⁇ m to 300 ⁇ m, but is 1.1 ⁇ 10 19 atoms/ It is preferably cc or less.
- Variation in the in-plane distribution of carbon concentration on the inner surface of the crucible causes in-plane variation in the thickness of the cristobalite layer formed on the inner surface of the crucible, which causes separation of the cristobalite crystals.
- the crystal layer is uneven at the bottom of the crucible, it causes pinholes in the silicon single crystal. Therefore, it is desirable that the variation in the in-plane distribution of the carbon concentration is small at the bottom of the crucible.
- the coefficient of variation is 1.1 or less when measuring the carbon concentration at five points P1 to P5 on the bottom of the crucible.
- the five points on the bottom of the crucible are the center P1 of the bottom and four points P2 to P5 that are the same distance away from the center P1 in four directions.
- the other four points P2 to P5 other than the center P1 of the bottom are located 0.08r to 0.7r away from the center P1 (first measurement point) of the bottom of the crucible base 10 in the radial direction (r is the crucible base 10 is preferably set to the radius of the outer diameter of
- the third to fifth measurement points P3 to P5 are positions obtained by rotating the second to fourth measurement points P2 to P4 clockwise by 90° in the circumferential direction.
- the quartz glass crucible 1 according to the present embodiment can be manufactured by applying a crystallization accelerator to the inner surface of the crucible base 10 after manufacturing the crucible base 10 by a so-called rotational molding method.
- FIG. 5 is a schematic diagram showing a method for manufacturing a silica glass crucible by a rotating mold method.
- a mold 14 having a cavity matching the outer shape of the crucible is prepared, and natural quartz powder 16a and synthetic quartz powder 16b are filled in order along the inner surface 14i of the rotating mold 14. to form a deposited layer 16 of raw material quartz powder.
- the raw material silica powder remains in a fixed position while sticking to the inner surface 14i of the mold 14 by centrifugal force, and is maintained in a crucible shape.
- silica glass crucible 1 In manufacturing the silica glass crucible 1, crystalline or amorphous silica powder having a carbon content of less than 6 ppm is prepared, and the silica glass crucible 1 is manufactured using this silica powder as a raw material near the inner surface.
- silica powder having a very low carbon content As the raw material near the inner surface of the quartz glass crucible, the carbon concentration near the inner surface of the crucible can be reduced.
- an arc electrode 15 is placed inside the mold 14 and the deposited layer 16 of raw material silica powder is arc-melted from the inside of the mold 14 .
- Specific conditions such as heating time and heating temperature are appropriately determined in consideration of the properties of the raw material quartz powder, the size of the crucible, and the like.
- a carbon electrode having a bulk specific gravity of 1.50 g/cc to 1.75 g/cc and a specific resistance of 330 ⁇ cm to 600 ⁇ cm as the arc electrode 15.
- CO 2 gas is generated by oxidative wear of the carbon electrode from the surface.
- the specific gravity or resistivity of the electrode is below the above range, the electrode will be rapidly consumed, generating a large amount of CO 2 gas and adversely affecting the shape of the crucible.
- the specific gravity and specific resistance of the carbon electrode exceed the above ranges, carbon particles may scatter from the electrode surface and be taken into the crucible before they are burned out by the arc heat.
- a carbon electrode having a specific gravity and a specific resistance within the above ranges is used, so an increase in CO 2 gas and scattering of carbon particles can be suppressed. Therefore, the carbon concentration near the inner surface of the crucible base 10 can be reduced.
- the amount of air bubbles in the molten silica glass is controlled by evacuating the deposited layer 16 of the raw material quartz powder from a large number of air holes 14a provided on the inner surface 14i of the mold 14. Specifically, at the start of arc melting, the raw quartz powder is evacuated to form the transparent layer 11 , and after the formation of the transparent layer 11 , the evacuation of the raw quartz powder is stopped to form the bubble layer 12 .
- the transparent layer 11 and the The bubble layer 12 can be produced separately. That is, if reduced-pressure melting is performed by increasing the reduced pressure at the timing when the raw material silica powder is melted, the gas in the arc atmosphere is not confined in the glass, so that the fused silica becomes silica glass containing no air bubbles. Also, if normal melting (atmospheric pressure melting) is performed by weakening the reduced pressure at the timing of melting the raw material quartz powder, the arc atmosphere gas is confined in the glass, so the fused silica becomes silica glass containing many bubbles.
- normal melting atmospheric pressure melting
- the arc melting is terminated and the crucible is cooled.
- the crucible base body 10 having the transparent layer 11 and the bubble layer 12 provided in order from the inside to the outside of the crucible wall is completed.
- the cleaning liquid is preferably prepared by diluting hydrofluoric acid of semiconductor grade or higher with pure water of TOC ⁇ 2 ppb to 10 to 40 w %.
- the inner surface 10i of the crucible base 10 is coated with a crystallization accelerator.
- a coating liquid in which the crystallization accelerator is dissolved in pure water (15° C. to 25° C., 17.2 M ⁇ or more, TOC ⁇ 2 ppb) or a high-purity organic solvent to prepare.
- the solution is stirred with a stirrer in order to increase the solubility of the particles of the crystallization accelerator and make the concentration of the solution uniform.
- the crystallization accelerator is a compound of group 2a elements (Mg, Ca, Sr, Ba), and in particular, highly hydrophilic hydroxides are most suitable for enhancing fixability to the crucible.
- Hydroxides of Group 2a elements react with carbon dioxide gas in the atmosphere to form carbonates (for example, in the case of barium hydroxide, 2.5% becomes barium carbonate).
- Carbon on the inner surface of the quartz glass crucible is directly incorporated into the silicon melt when the polysilicon is melted.
- the carbon element incorporated into the silicon single crystal promotes oxygen precipitation and affects device performance such as current leakage. It is important to keep the temperature below 200°C.
- the heating temperature of the crucible base 10 In order to evaporate the solvent in a short time and reduce the formation of carbonate, it is more preferable to set the heating temperature of the crucible base 10 to 80° C. or higher from the boiling point of the solvent. If the temperature of the crucible substrate 10 is lower than the boiling point of the solvent, the evaporation time of the solvent will be long, and the thickness of the coating film and the concentration distribution of the crystallization accelerator will become non-uniform, thereby reducing the peel strength of the coating film. is. Moreover, if the evaporation time of the solvent is long, condensation of the coating liquid may occur on the surface of the crucible, which may cause the carbon concentration to become high and non-uniform. If the temperature of the crucible substrate 10 is 80° C. or less, the carbon concentration in the coating film can be reduced by sufficiently suppressing the generation of carbonate.
- the average droplet diameter is 200 ⁇ m or less.
- the spray amount of the coating liquid is preferably 300 mL/min or less. This is because if the spray amount of the coating liquid is more than 300 mL/min, the coating liquid tends to drip on the coating surface, making it difficult to uniformly fix the crystallization accelerator.
- the coating liquid it is preferable to spray the coating liquid under a low vacuum of 1 ⁇ 10 2 Pa to 1 ⁇ 10 5 Pa. Evaporation of the solvent is accelerated under low pressure (vacuum), and the crystallization accelerator can be fixed uniformly, thereby forming a coating film with high peel strength. In addition, since the solvent can be evaporated in a short time, the heating time can be shortened, so the generation of carbonate can be suppressed.
- the thickness of the crystallization accelerator formed in one application it is preferable to set the thickness of the crystallization accelerator formed in one application to a maximum of about 0.5 ⁇ m, and to apply it in multiple steps until the desired concentration is achieved. Thereby, the strength of the coating film can be increased.
- FIG. 6 is a schematic diagram showing a method of applying a crystallization accelerator to the inner surface 10i of the crucible base 10.
- the crucible base 10 is placed on the rotation support 17A with the opening facing upward, and attached to the tip of the robot arm 18 placed inside the crucible base 10.
- the coating liquid 6 is sprayed from the spray nozzle 19 .
- a heater 17B outside the crucible base 10 and apply while heating the crucible base 10 to 60°C to 500°C, preferably 100°C to 180°C. is particularly preferred. If the surface temperature of the crucible base 10 is 60° C. or higher, the solvent instantly evaporates on the surface of the crucible base 10 , so that the crystallization accelerator can be uniformly fixed on the inner surface 10 i of the crucible base 10 .
- the crystallization accelerator When the crystallization accelerator is a metal hydroxide, it reacts with carbon dioxide gas in the atmosphere to form a carbonate. For example, 2.5% of barium hydroxide becomes barium carbonate in the atmosphere and normal pressure. Carbonate in the coating film 13 causes an increase in the carbon concentration of the silicon single crystal. In order to suppress the formation of such carbonates, it is preferable to set the surface temperature of the crucible when applying the crystallization accelerator to 500° C. or lower, and particularly preferably to the boiling point of the solvent or higher and 80° C. or lower. . As a result, the weight ratio of carbonate in the total weight of the coating film can be suppressed to 20.0 wt % or less.
- FIG. 7 is a diagram for explaining the single crystal pulling process using the silica glass crucible 1 according to the present embodiment, and is a schematic cross-sectional view showing the configuration of the single crystal pulling apparatus.
- a single crystal pulling apparatus 20 is used in the step of pulling a silicon single crystal by the CZ method.
- the single-crystal pulling apparatus 20 includes a water-cooled chamber 21, a quartz glass crucible 1 holding silicon melt in the chamber 21, a carbon susceptor 22 holding the quartz glass crucible 1, and capable of rotating and lifting the carbon susceptor 22.
- a rotating shaft 23 supported by a rotating shaft 23, a shaft driving mechanism 24 for rotating and vertically driving the rotating shaft 23, a heater 25 disposed around the carbon susceptor 22, and a rotating shaft above the quartz glass crucible 1 of the heater 25
- a single crystal pulling wire 28 is arranged coaxially with 23 , and a wire winding mechanism 29 is arranged above the chamber 21 .
- the chamber 21 is composed of a main chamber 21a and an elongated cylindrical pull chamber 21b connected to an upper opening of the main chamber 21a.
- the quartz glass crucible 1, the carbon susceptor 22 and the heater 25 are placed in the main chamber 21a. is provided.
- a gas introduction port 21c for introducing an inert gas (purge gas) such as argon gas or a dopant gas into the main chamber 21a is provided in the upper part of the pull chamber 21b, and the main chamber 21a is provided in the lower part of the main chamber 21a.
- a gas outlet 21d is provided for discharging the atmospheric gas inside.
- the carbon susceptor 22 is used to maintain the shape of the quartz glass crucible 1 softened under high temperature, and holds the quartz glass crucible 1 so as to wrap it.
- the quartz glass crucible 1 and the carbon susceptor 22 form a double-structured crucible that supports the silicon melt in the chamber 21 .
- the carbon susceptor 22 is fixed to the upper end of the rotating shaft 23 , and the lower end of the rotating shaft 23 penetrates the bottom of the chamber 21 and is connected to the shaft driving mechanism 24 provided outside the chamber 21 .
- the heater 25 melts the polycrystalline silicon raw material filled in the quartz glass crucible 1 to generate the silicon melt 3 and is used to maintain the melted state of the silicon melt 3 .
- the heater 25 is a resistance heating type carbon heater, and is provided so as to surround the quartz glass crucible 1 in the carbon susceptor 22 .
- the quartz glass crucible 1 Although the amount of silicon melt in the quartz glass crucible 1 decreases as the silicon single crystal 2 grows, the quartz glass crucible 1 is raised so that the height of the melt surface is constant.
- the wire winding mechanism 29 is arranged above the pull chamber 21b, the wire 28 extends downward through the inside of the pull chamber 21b from the wire winding mechanism 29, and the tip of the wire 28 extends inside the main chamber 21a. reaching the space.
- This figure shows a state in which a silicon single crystal 2 in the process of growing is suspended from a wire 28 .
- the wire 28 is gradually pulled up while rotating the silica glass crucible 1 and the silicon single crystal 2 to grow the silicon single crystal 2 .
- the inner surface of the crucible crystallizes, but the crystallization of the inner surface of the crucible proceeds uniformly due to the action of the crystallization accelerator, preventing dislocations in the silicon single crystal due to exfoliation of brown rings. can do.
- the silica glass crucible 1 is softened, crystallization of the inner surface of the crucible proceeds uniformly, so that the strength of the crucible can be secured and deformation can be suppressed. Therefore, it is possible to prevent the crucible from deforming and coming into contact with the in-furnace members, or from changing the volume of the crucible and causing the surface position of the silicon melt 3 to fluctuate.
- the quartz glass crucible 1 includes the crucible base 10 made of silica glass and the coating film 13 of the crystallization accelerator formed on the inner surface 10i of the crucible base 10. Since the peel strength of 13 is 0.3 kN/m or more, it is possible to reduce roughening of the crucible inner surface due to peeling of the coating film 13, generation of pinholes, and generation of dislocations in the single crystal.
- a two-fluid nozzle is used that mixes and sprays the gas and the liquid at the spray tip.
- the coating liquid is sprayed with an average droplet diameter of 5 ⁇ m or more and 1000 ⁇ m or less, it is possible to form a dense coating film with a small droplet diameter, thereby increasing the peel strength of the coating film.
- the coating liquid containing the crystallization accelerator when the coating liquid containing the crystallization accelerator is sprayed onto the inner surface of the crucible base 10 to form the coating film of the crystallization accelerator, the coating liquid is applied once.
- the maximum thickness of the coating film formed in is 0.5 ⁇ m or less, and the coating film 13 is multilayered by alternately repeating drying and recoating of the coating film until the desired carbon concentration is reached. A film can be formed.
- the inner surface 10i of the crucible substrate 10 is covered with the coating film 13 of the crystallization accelerator, and the outer surface 10o is not covered with the coating film, but both the inner surface 10i and the outer surface 10o may be covered with a coating film of a crystallization accelerator. That is, it is sufficient that the coating film of the crystallization accelerator covers at least the inner surface 10i of the crucible base 10 .
- the coating film 13 does not necessarily have to be formed on the entire inner surface of the crucible base except for the vicinity of the upper end of the rim, and the coating film on the inner surface of the side wall portion 10a may be omitted. That is, the coating film 13 may be provided at least on the inner surface of the bottom center region (within a range of 0.5r from the center of the bottom) of the crucible base body 10 .
- the crucible base 10 is oriented upward when the coating liquid is sprayed onto the inner surface of the crucible base 10.
- the coating liquid is applied while the crucible base 10 is turned upside down and oriented downward.
- the heating of the crucible base 10 may be performed while applying the crystallization accelerator, the application may be performed after preheating the crucible base 10, or the crystallization accelerator may be applied after preheating the crucible base 10.
- the crucible is continuously heated using a heating means different from that for preheating while the crystallization accelerator is applied. It is also possible to implement
- a crucible base constituting a 32-inch quartz glass crucible was produced by a rotary mold method.
- the crucible substrates according to Examples 1-4 and Comparative Examples 1-4 were produced under the same conditions using the same kind of polycrystalline silicon raw material.
- a carbon electrode with a bulk specific gravity of 1.50 g/cc to 1.75 g/cc and a specific resistance of 330 ⁇ cm to 600 ⁇ cm was used during arc melting of quartz powder.
- the raw material powder was evacuated from the outside of the rotating mold that supported the raw material powder to form a transparent layer, and then the vacuum was stopped or the suction force was weakened to form a bubble layer. .
- the rim portion of the crucible base was cut, washed with a cleaning liquid, rinsed with pure water, and then a crystallization accelerator was applied to the inner surface of the crucible.
- Semiconductor grade hydrofluoric acid was diluted with pure water (17.2 M ⁇ or more, 15 to 25° C.) of TOC ⁇ 2 ppb to prepare 10 to 40 w % for the cleaning solution.
- An aqueous solution of barium hydroxide was used as the crystallization accelerator, and was uniformly applied by a spray method.
- the crystallization accelerator the crucible substrate was heated with a halogen heater, and the application was performed while measuring the surface temperature of the crucible.
- a two-fluid nozzle was used to spray the crystallization accelerator, and the spraying conditions were adjusted so that the average droplet diameter was about 200 ⁇ m.
- a laser diffraction particle size distribution analyzer (AEROTRACII manufactured by Microtrack Bell Co., Ltd.) was used to confirm the droplet size.
- the thickness of the coating film of the crystallization accelerator formed by one coating was set to about 0.5 ⁇ m, and the coating was repeated in multiple steps until the desired concentration was achieved. In this way, as shown in Table 1, a quartz glass crucible having a coating film of a crystallization accelerator formed on the inner surface of the crucible base was completed.
- the concentration of the crystallization accelerator at the bottom of the crucible (range within 0.5 times the outer diameter of the crucible from the center of the bottom of the crucible) was 2.6 ⁇ 10 15 atoms/cm.
- the coating conditions were adjusted so that the value was 2 or less.
- the application conditions were adjusted so that the concentration of the crystallization accelerator was different between the bottom and the non-bottom.
- the peel strength of the coating film of the crystallization accelerator was measured by SAICAS in each quartz glass crucible.
- the peel strength the peel strength of the crucible bottom and the peel strength of the portion other than the bottom were measured.
- the measurement position of the peel strength at the bottom of the crucible was one point at the center of the bottom of the crucible.
- the peel strength measurement position other than the bottom of the crucible was an arbitrary point within the range of 0.55 to 0.6 times the outer diameter of the crucible from the center of the bottom.
- the concentration of the crystallization accelerator on the inner surface of the silica glass crucible according to Comparative Example A1 was 2.6 ⁇ 10 14 atoms/cm 2 at the bottom and 3.1 ⁇ 10 14 atoms/cm 2 at other than the bottom. cm2 .
- the peel strength of the coating film of the crystallization accelerator was 0.2 kN/m at the bottom and 0.3 kN/m at other than the bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. It was common in both the bottom and non-bottom of . In addition, the inner surface of the used crucible was often rough.
- the yield of silicon single crystals pulled using the quartz glass crucible was 61.5%, which was less than 80%.
- the concentration of the crystallization accelerator on the inner surface of the silica glass crucible according to Comparative Example A2 was 2.4 ⁇ 10 14 atoms/cm 2 at the bottom and 2.1 ⁇ 10 15 atoms/cm 2 at the other portions.
- the peel strength of the coating film of the crystallization accelerator was 0.2 kN/m at the bottom and 0.5 kN/m at other than the bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. It was high at the bottom of the , but was moderate at other than the bottom. Also, the inner surface of the used crucible was moderately rough.
- the yield of silicon single crystals pulled using the quartz glass crucible was 62.2%, which was lower than 80%.
- the concentration of the crystallization accelerator on the inner surface of the quartz glass crucible according to Comparative Example A3 was 2.6 ⁇ 10 15 atoms/cm 2 at the bottom and 2.5 ⁇ 10 15 atoms/cm 2 at the rest.
- the peel strength of the coating film of the crystallization accelerator was 0.5 kN/m at the bottom and 0.6 kN/m at other than the bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. It was moderate at the bottom of the , but low outside the bottom. Also, the inner surface of the used crucible was moderately rough.
- the yield of silicon single crystals pulled using the quartz glass crucible was 69.1%, which was lower than 80%.
- the concentration of the crystallization accelerator on the inner surface of the silica glass crucible according to Comparative Example A4 was 2.3 ⁇ 10 15 atoms/cm 2 at the bottom portion and 2.8 ⁇ 10 14 atoms/cm 2 at the portion other than the bottom portion.
- the peel strength of the coating film of the crystallization accelerator was 0.4 kN/m at the bottom and 0.2 kN/m at other than the bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. It was moderate at the bottom of the , but was abundant outside the bottom. Also, the inner surface of the used crucible was moderately rough.
- the yield of silicon single crystals pulled using the quartz glass crucible was 65.2%, which was less than 80%.
- the concentration of the crystallization accelerator on the inner surface of the quartz glass crucible according to Example A1 was 2.0 at the bottom. It was 5 ⁇ 10 14 atoms/cm 2 and 2.4 ⁇ 10 14 atoms/cm 2 except for the bottom.
- the peel strength of the coating film of the crystallization accelerator was 0.6 kN/m on the bottom portion and 0.6 kN/m on portions other than the bottom portion.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. was low both at the bottom and off the bottom of the In addition, the inner surface of the used crucible was less roughened.
- the yield of silicon single crystals pulled using the quartz glass crucible was 81.2%, which was a good result exceeding 80%.
- the concentration of the crystallization accelerator on the inner surface of the quartz glass crucible according to Example A2 was 2.0 at the bottom. It was 6 ⁇ 10 14 atoms/cm 2 and 2.4 ⁇ 10 15 atoms/cm 2 except for the bottom part.
- the peel strength of the coating film of the crystallization accelerator was 0.7 kN/m at the bottom and 1.2 kN/m at other than the bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. was low both at the bottom and off the bottom of the In addition, the inner surface of the used crucible was less roughened. The yield of silicon single crystals pulled using the quartz glass crucible was 83.6%, which was a good result exceeding 80%.
- the concentration of the crystallization accelerator on the inner surface of the quartz glass crucible according to Example A3 was 2.0 at the bottom. 0 ⁇ 10 15 atoms/cm 2 and 2.6 ⁇ 10 15 atoms/cm 2 except for the bottom.
- the peel strength of the coating film of the crystallization accelerator was 1.0 kN/m on the bottom and 1.1 kN/m on the other portions.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. was low both at the bottom and off the bottom of the In addition, the inner surface of the used crucible was less roughened.
- the yield of silicon single crystals pulled using the quartz glass crucible was 85.3%, which was a good result exceeding 80%.
- the concentration of the crystallization accelerator on the inner surface of the quartz glass crucible according to Example A4 was 2.0 at the bottom. 0 ⁇ 10 15 atoms/cm 2 and 2.6 ⁇ 10 15 atoms/cm 2 except for the bottom.
- the peel strength of the coating film of the crystallization accelerator was 1.0 kN/m on the bottom and 1.1 kN/m on the other portions.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. was low both at the bottom and off the bottom of the In addition, the inner surface of the used crucible was less roughened.
- the yield of silicon single crystals pulled using the quartz glass crucible was 85.3%, which was a good result exceeding 80%.
- the concentration of the crystallization accelerator on the inner surface of the silica glass crucible according to Comparative Example B1 was 5.2 ⁇ 10 15 atoms/cm 2 both at the bottom and at the non-bottom.
- the peel strength of the coating film of the crystallization accelerator was 0.2 kN/m both on the bottom and on the non-bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. It was common in both the bottom and non-bottom of . In addition, the inner surface of the used crucible was often rough.
- the yield of silicon single crystals pulled using the quartz glass crucible was 70.2%, which was less than 80%.
- the concentration of the crystallization accelerator on the inner surface of the quartz glass crucible according to Comparative Example B2 was 5.2 ⁇ 10 15 atoms/cm 2 at the bottom and 2.8 ⁇ 10 16 atoms/cm 2 at the rest.
- the peel strength of the coating film of the crystallization accelerator was 0.1 kN/m at the bottom and 0.4 kN/m at other than the bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. It was high at the bottom of the , but was moderate at other than the bottom. Also, the inner surface of the used crucible was moderately rough.
- the yield of silicon single crystals pulled using the silica glass crucible was 72.3%, which was less than 80%.
- the concentration of the crystallization accelerator on the inner surface of the quartz glass crucible according to Comparative Example B3 was 4.9 ⁇ 10 17 atoms/cm 2 at the bottom and 2.4 ⁇ 10 15 atoms/cm 2 at the rest.
- the peel strength of the coating film of the crystallization accelerator was 0.2 kN/m at the bottom and 0.3 kN/m at other than the bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. It was high at the bottom of the , but was moderate at other than the bottom. Also, the inner surface of the used crucible was moderately rough.
- the yield of silicon single crystals pulled using the quartz glass crucible was 71.5%, which was less than 80%.
- the concentration of the crystallization accelerator on the inner surface of the quartz glass crucible according to Example B1 was 5.2 ⁇ 10 15 atoms/cm 2 both at the bottom and at the non-bottom.
- the peel strength of the coating film of the crystallization accelerator was 0.3 kN/m at the bottom and 0.4 kN/m at other than the bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. It was moderate on both the bottom and off-bottom of the .
- the inner surface of the used crucible was less roughened.
- the yield of silicon single crystals pulled using the quartz glass crucible was 80.2%, which was a good result exceeding 80%.
- the concentration of the crystallization accelerator on the inner surface of the quartz glass crucible according to Example B2 was 2.0 at the bottom. 8 ⁇ 10 16 atoms/cm 2 and 5.2 ⁇ 10 15 atoms/cm 2 except for the bottom.
- the peel strength of the coating film of the crystallization accelerator was 1.0 kN/m at the bottom and 0.3 kN/m at other than the bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. It was low at the bottom of , and medium at the bottom. In addition, the inner surface of the used crucible was less roughened. The yield of silicon single crystals pulled using the quartz glass crucible was 87.6%, which was a good result exceeding 80%.
- the concentration of the crystallization accelerator on the inner surface of the quartz glass crucible according to Example B3 was 2.6 ⁇ 10 16 atoms/cm 2 at the bottom and 4.9 ⁇ 10 17 atoms/cm 2 at the other portions.
- the peel strength of the coating film of the crystallization accelerator was 1.3 kN/m at the bottom and 1.1 kN/m at other than the bottom.
- Another crucible sample with the same properties and manufactured under the same conditions as this crucible sample was used to pull a silicon single crystal. was low both at the bottom and off the bottom of the In addition, the inner surface of the used crucible was less roughened.
- the yield of silicon single crystals pulled using the quartz glass crucible was 87.8%, which was a good result exceeding 80%.
- quartz glass crucible 1s crucible sample 2 silicon single crystal 3 silicon melt 6 coating liquid 10 crucible base 10a side wall 10b bottom 10c corner 10i crucible base inner surface 10o crucible base outer surface 11 transparent layer 12 bubble layer 13 crystallization Accelerator coating film 14 Mold 14a Vent hole 14i Mold inner surface 15 Arc electrode 16 Quartz powder deposition layer 16a Natural quartz powder 16b Synthetic quartz powder 17A Rotary support 17B Heater 18 Robot arm 19 Spray nozzle 20 Single crystal pulling device 21 Chamber 21a Main chamber 21b Pull chamber 21c Gas inlet 21d Gas outlet 22 Carbon susceptor 23 Rotating shaft 24 Shaft driving mechanism 25 Heater 28 Single crystal pulling wire 29 Wire winding mechanism 30 SAICAS 31 diamond blade
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Abstract
Description
32インチ石英ガラスルツボを構成するルツボ基体を回転モールド法により作製した。実施例1~4並びに比較例1~4によるルツボ基体は、同種の多結晶シリコン原料を用いて同一条件下で作製した。
5×1014atoms/cm2、底部以外において2.4×1014atoms/cm2であった。結晶化促進剤の塗布膜の剥離強度は、底部において0.6kN/m、底部以外においても0.6kN/mであった。このルツボサンプルと同一条件で製造した同一特性の別のルツボサンプルを用いてシリコン単結晶の引き上げを行ったところ、使用済みルツボの内表面に形成されたクリストバライト(ブラウンリング)の剥離の程度はルツボの底部と底部以外の両方で少なかった。また使用済みルツボの内表面の肌荒れも少なかった。当該石英ガラスルツボを用いて引き上げられたシリコン単結晶の歩留まりは81.2%となり、80%を超える良好な結果となった。
6×1014atoms/cm2、底部以外において2.4×1015atoms/cm2であった。結晶化促進剤の塗布膜の剥離強度は、底部において0.7kN/m、底部以外においても1.2kN/mであった。このルツボサンプルと同一条件で製造した同一特性の別のルツボサンプルを用いてシリコン単結晶の引き上げを行ったところ、使用済みルツボの内表面に形成されたクリストバライト(ブラウンリング)の剥離の程度はルツボの底部と底部以外の両方で少なかった。また使用済みルツボの内表面の肌荒れも少なかった。当該石英ガラスルツボを用いて引き上げられたシリコン単結晶の歩留まりは83.6%となり、80%を超える良好な結果となった。
0×1015atoms/cm2、底部以外において2.6×1015atoms/cm2であった。結晶化促進剤の塗布膜の剥離強度は、底部において1.0kN/m、底部以外においても1.1kN/mであった。このルツボサンプルと同一条件で製造した同一特性の別のルツボサンプルを用いてシリコン単結晶の引き上げを行ったところ、使用済みルツボの内表面に形成されたクリストバライト(ブラウンリング)の剥離の程度はルツボの底部と底部以外の両方で少なかった。また使用済みルツボの内表面の肌荒れも少なかった。当該石英ガラスルツボを用いて引き上げられたシリコン単結晶の歩留まりは85.3%となり、80%を超える良好な結果となった。
0×1015atoms/cm2、底部以外において2.6×1015atoms/cm2であった。結晶化促進剤の塗布膜の剥離強度は、底部において1.0kN/m、底部以外においても1.1kN/mであった。このルツボサンプルと同一条件で製造した同一特性の別のルツボサンプルを用いてシリコン単結晶の引き上げを行ったところ、使用済みルツボの内表面に形成されたクリストバライト(ブラウンリング)の剥離の程度はルツボの底部と底部以外の両方で少なかった。また使用済みルツボの内表面の肌荒れも少なかった。当該石英ガラスルツボを用いて引き上げられたシリコン単結晶の歩留まりは85.3%となり、80%を超える良好な結果となった。
ルツボの底部における結晶化促進剤の濃度が2.6×1015atoms/cm2よりも高くなるように塗布条件を調整した点以外は「剥離強度の評価(1)」と同様にして比較例1~3並びに実施例1~3による石英ガラスルツボを完成させた。その後、「剥離強度の評価(1)」と同様の評価を行った。その結果を表2に示す。
8×1016atoms/cm2、底部以外において5.2×1015atoms/cm2であった。結晶化促進剤の塗布膜の剥離強度は、底部において1.0kN/m、底部以外において0.3kN/mであった。このルツボサンプルと同一条件で製造した同一特性の別のルツボサンプルを用いてシリコン単結晶の引き上げを行ったところ、使用済みルツボの内表面に形成されたクリストバライト(ブラウンリング)の剥離の程度はルツボの底部では少なく、底部以外では中程度であった。また使用済みルツボの内表面の肌荒れも少なかった。当該石英ガラスルツボを用いて引き上げられたシリコン単結晶の歩留まりは87.6%となり、80%を超える良好な結果となった。
石英ガラスルツボの内表面に形成された結晶化促進剤の塗布膜の厚さとシリコン単結晶の歩留まりとの相関を評価した。その結果を表3に示す。
石英ガラスルツボの内表面に形成された結晶化促進剤の塗布膜の表面粗さ(Ra)とシリコン単結晶の歩留まりとの相関を評価した。その結果を表4に示す。
1s ルツボサンプル
2 シリコン単結晶
3 シリコン融液
6 塗布液
10 ルツボ基体
10a 側壁部
10b 底部
10c コーナー部
10i ルツボ基体の内表面
10o ルツボ基体の外表面
11 透明層
12 気泡層
13 結晶化促進剤の塗布膜
14 モールド
14a 通気孔
14i モールドの内面
15 アーク電極
16 石英粉の堆積層
16a 天然石英粉
16b 合成石英粉
17A 回転支持体
17B ヒーター
18 ロボットアーム
19 スプレーノズル
20 単結晶引き上げ装置
21 チャンバー
21a メインチャンバー
21b プルチャンバー
21c ガス導入口
21d ガス排出口
22 カーボンサセプタ
23 回転シャフト
24 シャフト駆動機構
25 ヒーター
28 単結晶引き上げ用ワイヤー
29 ワイヤー巻き取り機構
30 SAICAS
31 ダイヤモンド刃
Claims (19)
- シリカガラスからなるルツボ基体と、
前記ルツボ基体の内表面に形成された結晶化促進剤を含有した塗布膜とを備え、
前記塗布膜の剥離強度が0.3kN/m以上であることを特徴とする石英ガラスルツボ。 - 前記結晶化促進剤の濃度が2.5×1015atoms/cm2以下であり、
前記塗布膜の剥離強度が0.6kN/m以上である、請求項1に記載の石英ガラスルツボ。 - 前記結晶化促進剤の濃度が2.5×1015atoms/cm2より高い、請求項1に記載の石英ガラスルツボ。
- 前記ルツボ基体の底部における前記塗布膜の範囲がルツボ外径の0.25倍以上1倍以下の範囲である、請求項1乃至3のいずれか一項に記載の石英ガラスルツボ。
- 前記底部の中心から前記ルツボ基体の外径の0.5倍以下の範囲内に形成された前記塗布膜の剥離強度が0.9kN/m以上である、請求項4に記載の石英ガラスルツボ。
- 前記結晶化促進剤は分子内に炭素原子をもたない2a族元素(Mg,Ca,Sr,Ba)の水溶性の化合物である、請求項1乃至5のいずれか一項に記載の石英ガラスルツボ。
- 前記塗布膜の厚さが0.1μm以上50μm以下である、請求項1乃至6のいずれか一項に記載の石英ガラスルツボ。
- 前記塗布膜の表面粗さ(Ra)が0.1μm以上0.25μm以下である、請求項1乃至7のいずれか一項に記載の石英ガラスルツボ。
- 前記塗布膜及び前記ルツボ基体の内表面から深さ0μm以上300μm以下の範囲内の平均炭素濃度が1.0×1012atoms/cc以上3.0×1019atoms/cc以下である、請求項1乃至8のいずれか一項に記載の石英ガラスルツボ。
- 前記塗布膜中の平均炭素濃度が3.0×1018atoms/cc以下である、請求項1乃至9のいずれか一項に記載の石英ガラスルツボ。
- シリカガラスからなるルツボ基体を作製する工程と、
結晶化促進剤を含有した塗布液を吹き付けることで前記ルツボ基体の内表面に結晶化促進剤の塗布膜を形成する工程とを備え、
前記塗布液を吹き付ける工程は、気体と液体をスプレー先で混合して噴霧する二流体ノズルを用いて平均液滴径を5μm以上1000μm以下として吹き付けることを特徴とする石英ガラスルツボの製造方法。 - 一回の塗布で形成する前記塗布膜の最大厚さを0.5μm以下とし、前記塗布膜の乾燥と再塗布とを交互に繰り返すことにより前記塗布膜を多層化する、請求項11に記載の石英ガラスルツボの製造方法。
- 前記塗布液の噴霧量が300mL/min以下である、請求項11又は12に記載の石英ガラスルツボの製造方法。
- 前記結晶化促進剤は分子内に炭素原子をもたない2a族元素(Mg,Ca,Sr,Ba)の水溶性の化合物である、請求項11乃至13のいずれか一項に記載の石英ガラスルツボの製造方法。
- 前記ルツボ基体を60℃以上500℃以下の温度で加熱しながら前記塗布液の吹き付けを行う、請求項11乃至14のいずれか一項に記載の石英ガラスルツボの製造方法。
- 前記塗布液中の溶媒の沸点と前記ルツボ基体との温度差が-40.0℃以上100℃以下になるように前記ルツボ基体を加熱しながら前記塗布液の吹き付けを行う、請求項11乃至15のいずれか一項に記載の石英ガラスルツボの製造方法。
- 前記ルツボ基体を100℃以上180℃以下の温度で加熱しながら前記塗布液の吹き付けを行う、請求項11乃至16のいずれか一項に記載の石英ガラスルツボの製造方法。
- 1×102Pa以上1×105Pa以下の低真空下で前記ルツボ基体を加熱しながら前記塗布液の吹き付けを行う、請求項11乃至17のいずれか一項に記載の石英ガラスルツボの製造方法。
- 請求項1乃至10のいずれか一項に記載の石英ガラスルツボを用いてシリコン単結晶をCZ法により引き上げることを特徴とするシリコン単結晶の製造方法。
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JP2021050139A (ja) * | 2017-05-02 | 2021-04-01 | 株式会社Sumco | シリコン単結晶の製造方法 |
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JP2022180696A (ja) | 2022-12-07 |
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