WO2008007637A1 - Protective sheet for crucible and crucible device using the same - Google Patents
Protective sheet for crucible and crucible device using the same Download PDFInfo
- Publication number
- WO2008007637A1 WO2008007637A1 PCT/JP2007/063661 JP2007063661W WO2008007637A1 WO 2008007637 A1 WO2008007637 A1 WO 2008007637A1 JP 2007063661 W JP2007063661 W JP 2007063661W WO 2008007637 A1 WO2008007637 A1 WO 2008007637A1
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- WO
- WIPO (PCT)
- Prior art keywords
- crucible
- protective sheet
- less
- thermal conductivity
- thickness
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/10—Crucibles
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
-
- 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
- Y10T117/1004—Apparatus with means for measuring, testing, or sensing
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1032—Seed pulling
- Y10T117/1052—Seed pulling including a sectioned crucible [e.g., double crucible, baffle]
Definitions
- the present invention relates to a crucible protective sheet and a crucible device using the crucible protective sheet. More specifically, the crucible device includes an outer crucible and an inner crucible, and both crucibles arranged between the crucibles. The crucible protection sheet used to protect
- a force known to be a floating zone melting method (FZ method) and a Tyokrasky method (CZ method) is generally used.
- FZ method floating zone melting method
- CZ method Tyokrasky method
- a crucible device having an outer crucible heated by a heater or the like and an inner crucible containing raw materials such as silicon single crystal is used.
- quartz crucibles are used for the inner crucible due to problems with silicon reactivity and purity
- graphite crucibles are used for the outer crucible due to problems with purity, heat resistance and strength.
- the inner crucible is inserted into the outer crucible and used for manufacturing silicon single crystals.
- the crucible device has the following problems (1) and (2).
- the sheet or the like has a certain degree of flexibility, so that it functions as a cushioning material, and the SiO 2 is generated from the inner crucible with pyrolytic carbon coated on the surface. Since it reacts with gas etc., it is stated that reaction between SiO gas etc. and outer crucible can be prevented.
- the expanded graphite sheet is a material that has flexibility and high compression rate and high recovery rate, and because it has good thermal conductivity in the plane direction, it is effective in making the temperature in the vertical direction of the crucible uniform. Yes, it helps to relieve expansion and contraction stress due to thermal shock and thermal expansion.
- Patent Document 3 describes that expanded graphite sheet is very low in gas permeability, strong in anisotropic, and has resistance to gas permeability.
- Single crystal silicon is produced from polycrystalline silicon containing doping elements.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-261481
- Patent Document 2 Japanese Patent Laid-Open No. 2002-226292
- Patent Document 3 Japanese Patent No. 2528285
- Patent Document 4 Japanese Patent Laid-Open No. 2003-267781
- Patent Document 5 Japanese Patent Application Laid-Open No. 2004-75521
- Patent Document 6 Japanese Patent Publication No. 6-2637
- Patent Document 7 Patent No. 2923260
- Patent Document 8 Patent 3410380
- the crucible device has the following problems.
- carbon fibers are said to have a certain degree of flexibility, so they are arranged while being deformed along the outer surface of the inner crucible or the inner surface of the outer crucible. be able to.
- the carbon fiber members disclosed in Patent Documents 1 and 2 have a very high compressibility, the impact when inserting the inner crucible into the outer crucible cannot be sufficiently absorbed, and the force is also reduced when the crucible is cooled.
- the expansion / contraction stress generated between both crucibles cannot be sufficiently relaxed.
- Patent Documents 3 to 5 only the thickness and impurity concentration of the expanded graphite sheet are considered in specifying the properties of the expanded graphite sheet, and both thermal conductivity and compressibility are considered. Not done.
- the gas shielding property is described to some extent in Patent Document 3, and is hardly taken into account for specifying the properties of the expanded graphite sheet.
- the expansion between the outer crucible and the inner crucible is not considered.
- graphite sheets there are no examples of examining gas permeability suitable for such sheets together with thermal conductivity and compressibility.
- a crucible device with a very low amount of impurities in other words, the use of a very high quality crucible device, can suppress the entry of impurities into the molten silicon. It is expensive and causes an increase in the price of silicon production facilities, leading to an increase in the production cost of single crystal silicon.
- a high-quality crucible device requires strict quality control to prevent contamination after the device is manufactured, but this management cost is difficult to maintain the quality at a certain level or higher. Is also reflected in the production cost of single crystal silicon.
- the crucible protective sheet is difficult to reuse, and it is fundamental to use a new one almost every time. For this reason, the sheet cost required for one melting operation is not so high, but in the long run, the use of high quality sheets increases the production cost of single crystal silicon.
- the crucible protective sheet also has a problem that the working efficiency of purifying the crucible is not as good as that of the graphite crucible, which is difficult to purify. This is because a normal graphite crucible is a so-called porous material with microscopic pores, and impurities are released through these pores. In contrast, the black lead sheet has an extremely layered structure and is a material with no holes on the surface. If you try to do it, it will take a long time.
- the crucible protection sheet is flexible and requires care when handling large-area products. The efficiency of the work of purifying the sheet is higher than that of purifying the graphite crucible. This is one of the causes of the evil.
- the product quality of the single crystal silicon can be improved by improving the quality of the crucible device as described above, the production cost is increased. In particular, a high-quality sheet is used. As a result, the increase in the production cost of single crystal silicon is promoted, and therefore it is desired to develop a crucible device that can prevent the product quality of single crystal silicon from being lowered and suppress the production cost.
- the present invention suppresses damage to the inner crucible and suppresses the formation of SiC in the outer crucible, and the crucible protection capable of uniformly transferring heat from the outer crucible to the inner crucible.
- the purpose is to provide a sheet.
- Another object of the present invention is to provide a crucible protective sheet and a crucible device that can suppress an increase in production cost, and can effectively suppress a reduction in the strength of a manufactured product. To do.
- the present invention provides a crucible protective sheet disposed between an inner crucible containing a key and an outer crucible containing graphite and having an expanded graphite force.
- Q is the gas flow rate (Pa'cm 3 Zs)
- ⁇ ⁇ is the pressure difference between the two chambers (Pa)
- A is the gas permeation area of the crucible protection sheet, that is, 2 The area of the passage communicating with one chamber (cm 2 )
- L is the thickness (cm) of the crucible protection sheet.
- t is the thickness after applying preload (0.686 MPa ⁇ l%) for 15 seconds.
- t is the thickness (mm) after applying the total pressure (34.3 MPa ⁇ l%) for 60 seconds.
- the compression ratio when compressed under pressure under a predetermined condition is as high as 20% or more. Therefore, when the inner crucible is inserted into the outer crucible, the inner crucible is easily broken and easily damaged. As a result, the workability when inserting the inner crucible into the outer crucible is dramatically improved. Because of the high compressibility, the crucible protective sheet acts as a cushioning material even if the inner bottom surface of the outer crucible is uneven, so that the inclination of the inner crucible in the outer crucible is suppressed. Can do.
- the gas permeability is maintained to such an extent that the permeation of SiO gas generated when the inner crucible is heated, so that the outer crucible can be made SiC or thinned. Can be prevented.
- the compression ratio is based on the joint sheet JIS R 3453.
- the upper limit of the compression rate is preferably 60% or less. If the upper limit of the compression ratio exceeds 60%, the crucible protective sheet becomes hard, so that the effect of preventing the inner crucible from being damaged cannot be fully exhibited.
- the present invention provides a protective sheet for a crucible that is disposed between an inner crucible containing a cage and an outer crucible containing graphite, and is an expanded graphite shell.
- the thermal conductivity in the plane direction is 120 WZ (mK) or more, and the compression rate represented by the following formula (2) is 20% or more.
- t is the thickness after applying preload (0.686 MPa ⁇ l%) for 15 seconds.
- t is the thickness (mm) after applying the total pressure (34.3 MPa ⁇ l%) for 60 seconds.
- the compression rate is as high as 20% or more. Workability can be dramatically improved and the tilt of the inner crucible in the outer crucible can be prevented. Even if the compression ratio is high, the thermal conductivity in the surface direction is 120 WZ (m 'K) or more, so the inner crucible can be heated uniformly, resulting in reduced product quality. Can be prevented.
- the thermal conductivity in the plane direction is 120 WZ (m * K) or more.
- the compression ratio is high, it is possible to dramatically improve workability and suppress the inclination of the inner crucible in the outer crucible, and the gas permeability is low, so the inner crucible can be removed.
- the thermal conductivity in the surface direction is 120 WZ (mK) or more, so the inner crucible can be heated uniformly, As a result, deterioration of product quality can be prevented.
- the thickness of the crucible protection sheet is preferably 0.2 mm or more and 0.6 mm or less.
- the thickness of the crucible protection sheet is regulated as described above for the following reason. If the thickness of the crucible protective sheet is 0.2 mm or more, even if the crucible protective sheet is compressed when the inner crucible is inserted, the cushioning property of the crucible protective sheet can be maintained (the flexibility can be maintained). Therefore, the function of relaxing the expansion and contraction stress generated between both crucibles when the crucible is cooled is sufficiently exerted. In addition, if the thickness of the crucible protective sheet is 0.2 mm or more, it is possible to suppress a decrease in tensile strength and bending strength.
- the crucible protective sheet can be prevented from cracking.
- the thickness of the protective sheet for crucible is 0.6 mm or less, it is possible to prevent the bending property from being deteriorated, so when bending stress is applied to the protective sheet for crucible when the crucible is attached. Even so, the crucible protection sheet can be prevented from being cracked or chipped.
- the force density is preferably 0.5 Mg / m 3 or more and 1.5 Mg / m 3 or less.
- the strength density is less than 0.5 MgZm 3
- the strength of the crucible protective sheet is reduced, or cracking occurs when the crucible protective sheet is deformed.
- the bulk density exceeds 1.5 MgZm 3
- the impact absorbability and deformation capacity absorbability may decrease.
- the restoration rate shown in the following formula (3) is 5% or more.
- t is the thickness after applying preload (0.686 MPa ⁇ l%) for 15 seconds.
- t is the thickness (mm) after 60 seconds of total pressure (34.3 MPa ⁇ l%), t
- the restorability as described above is as high as 5% or more, even if it occurs between both crucibles due to the difference in expansion and contraction generated between both crucibles, the crucible protection sheet It is possible to keep the cushioning property of the crucible protective sheet.
- the restoration rate is based on the joint sheet JIS R 3453.
- the protective sheet for a crucible having a square shape with a side of 200 mm is divided into a square shape with a side of 25 mm and the thermal conductivity in each region is measured, the test that maximizes the thermal conductivity is performed.
- the difference between the value of the thermal conductivity in the region and the value of the thermal conductivity in the test region where the thermal conductivity is minimum divided by the average value of the thermal conductivity in all the test regions is 0.1. It is desirable to be defined as follows.
- the total amount of impurities is lOmassppm or less! /.
- the total amount of impurities is lOOmassppm or less, and the amount of at least one element among boron, phosphorus, arsenic, antimony, bismuth, and metal elements among a plurality of impurities contained therein is Desirably less than 3 massppm!
- the metal element is iron or indium.
- the amount of boron, phosphorus, arsenic, antimony, bismuth, iron, and indium be 3 massppm or less each! /.
- the total amount of boron, phosphorus, arsenic, iron, antimony, indium, and bismuth be lOmassppm or less! /.
- a structure in which a plurality of the crucible protection sheets described above are laminated may be employed.
- the strength of the crucible protective sheet body can be improved even if the thickness of each sheet is thin. Sheet damage can be suppressed, and even if one crucible protective sheet is damaged, the function of the crucible protective sheet is maintained due to the presence of the other crucible protective sheet.
- the interface resistance at the interface between each crucible protective sheet it is more difficult to pass SiO gas than when only one crucible protective sheet is used. As a result, it becomes more difficult for the SiO gas to reach the outer crucible, and the gas shielding property is further improved.
- the present invention provides a crucible protective sheet having an expanded graphite force disposed between both crucibles in a crucible having an inner crucible and an outer crucible.
- the total amount is less than lOOmassppm, and the amount of at least one element among boron, phosphorus, arsenic, antimony, bismuth, and metal elements among the mixed impurities is less than 3 massppm
- the amount of at least one element among boron, phosphorus, arsenic, antimony, bismuth, and metal elements among the mixed impurities is less than 3 massppm
- the specific element is boron, phosphorus, arsenic, antimony, bismuth, and metal elements
- boron, phosphorus, arsenic, antimony, and bismuth are elements that are used as dopants in the manufacture of semiconductors. If these elements are mixed into the product, they can be doped even in subsequent steps. This is because the inconvenience cannot be obtained when the characteristics cannot be obtained.
- a metal element when a metal element is mixed, it takes into account the disadvantage that it may become a conductor instead of a semiconductor.
- the metal element is iron or indium.
- the amounts of boron, phosphorus, arsenic, antimony, bismuth, iron, and indium are each 3 mass ppm or less! /.
- the total amount of boron, phosphorus, arsenic, iron, antimony, indium, and bismuth is lOmassppm or less! /.
- the total amount of the specific element as described above is also regulated, the effect of suppressing the occurrence of quality abnormality in the product can be further exhibited.
- the present invention provides a crucible including a crucible having an inner crucible and an outer crucible, and a crucible protective sheet having an expanded graphite force disposed between both crucibles.
- the total amount of impurities in the crucible protection sheet and the crucible is reduced, so that the amount of impurities mixed into the material can be suppressed.
- the production and quality control of each member are easy, and the product quality can be kept high while suppressing the production cost of the product.
- the outer crucible it is desirable to use a graphite crucible having a total amount of impurities of 20 massppm or less.
- the outer crucible is a graphite crucible, and its impurity ratio is low. Since the total amount of impurities in the entire system is reduced, the occurrence of product quality abnormalities can be suppressed. Since it is not necessary to make the quality of the protective sheet for the crucible, which is difficult to purify, compared to the outer crucible, it is easy to manufacture the protective sheet for the crucible and to control the quality of the protective sheet for the crucible. Therefore, the product quality can be kept high while the production cost of the product is suppressed.
- the outer crucible it is desirable to use a carbon composite crucible having a total amount of impurities of 20 massppm or less.
- the outer crucible is a carbon composite (czc) crucible, and the ratio of impurities is kept low, so the total amount of impurities in the entire system decreases and product quality abnormalities occur. Can be suppressed.
- the crucible protection sheet which is difficult to purify as compared to the outer crucible, is no longer required to have a high quality, so it is easy to manufacture the crucible protection sheet and to control the quality of the crucible protection sheet. As a result, the product quality can be kept high while suppressing the manufacturing cost of the product.
- FIG. 1 is a schematic explanatory diagram of equipment for producing silicon single crystals and the like
- FIG. 2 is a partially enlarged explanatory diagram of the crucible 1.
- reference numeral 1 denotes a crucible for accommodating polycrystalline silicon which is a raw material such as a silicon single crystal.
- a heater 5 is disposed around the crucible device 1, and the crucible device 1 is heated by radiant heat from the heater 5. For this reason When the crucible device 1 is heated by the heater 5, the polycrystalline silicon is heated and melted by heat conduction from the crucible device 1, so that the seed crystal is brought into contact with the molten silicon and pulled up.
- a silicon single crystal can be manufactured.
- the above crucible 1 apparatus is usually arranged between an inner crucible 2 made of quartz, an outer crucible 3 made of graphite (for example, its weight is about 20 to: LOOkg), and these crucibles 2, 3
- the crucible protective sheet 4 is provided. This crucible protective sheet 4 also prevents the outer crucible 3 from becoming SiC, prevents damage when the inner crucible 2 is inserted into the outer crucible 3, and cools the crucible device 1 after completion of production such as silicon single crystal.
- This crucible protective sheet 4 also prevents the outer crucible 3 from becoming SiC, prevents damage when the inner crucible 2 is inserted into the outer crucible 3, and cools the crucible device 1 after completion of production such as silicon single crystal.
- the crucible protective sheet of the present invention used in the above-described state is required to have the following characteristics in addition to the force that can naturally conduct heat from the outer crucible to the inner crucible.
- the first crucible protection sheet according to the invention is formed of graphite, the tooth forces is also smaller than the gas permeability force 1.
- the tooth forces is also smaller than the gas permeability force 1.
- 0 X 10- 4 cm 2 Zs represented by the aforementioned formula (1) Since the compression ratio expressed by the above-mentioned equation (2) is 20% or more, the above characteristics (a) to (c) can be satisfied.
- the crucible protective sheet according to the second invention is formed of expanded graphite and has a tensile force of 120 WZ (m'K) or more in the surface direction, and the above-mentioned formula (2) Since the compression ratio indicated by (2) is 20% or more, the characteristics (a), (b), and (d) as described above can be satisfied.
- the third protective sheet according crucible to the invention is formed from expanded graphite, and mosquitoes ⁇ also gas permeability force represented by the aforementioned formula (1) 1.
- 0 X 10- 4 cm 2 Since the compressibility expressed by the above formula (2), which is smaller than Zs, is 20% or more and the thermal conductivity in the plane direction is 120 WZ (m-K) or more, the above characteristics (a) All of (d) can be satisfied.
- the relationship between the parameters of the crucible protection sheet of the present invention and the characteristics (a) to (d) will be described below.
- the crucible protective sheet according to the present invention is a sheet of expanded graphite formed by immersing natural graphite, quiche graphite, or the like in a liquid such as sulfuric acid or nitric acid, followed by heat treatment at 400 ° C or higher. It is formed in a shape.
- Expanded graphite has a flocculent or fibrous shape, that is, its axial length is longer than its radial length. For example, its axial length is about 1 to 3 mm, and its radial direction. The length is about 300-600 m. And in the crucible protective sheet of the present invention, the above expanded graphite is entangled with each other.
- the crucible protective sheet of the present invention may be formed of only expanded graphite as described above, and a binder (such as about 5%), such as a force phenolic resin or rubber component, may be mixed.
- the crucible protective sheet according to the first to third inventions having the expanded graphite force as described above is restricted to a compression rate of 20% or more expressed by the above formula (1).
- the crucible protective sheet can be compressed and absorbed.
- the impact generated when the inner crucible is inserted is absorbed by the crucible protective sheet, the inner crucible can be prevented from being damaged, and accordingly, the workability of the insertion work is improved. Can do it.
- the crucible protection sheet has a sufficient compressibility, even if the inner bottom surface of the outer crucible has irregularities, the irregularities are in a state where the crucible protection sheet is recessed. Then, fill the gap between the outer surface of the inner crucible and the inner surface of the outer crucible with the crucible protection sheet. Can do. Therefore, when the inner crucible is inserted into the outer crucible, the inner crucible can be prevented from tilting even if the inner bottom surface of the outer crucible is uneven. Therefore, it is possible to prevent molten silicon from leaking due to the inclination of the inner crucible in the outer crucible.
- the crucible protective sheet has a compression rate as described above, if the thickness is too thin, it may not be possible to remove sufficient cushioning. In other words, there is a possibility that the crucible protection sheet may not be able to absorb the impact when the inner crucible is inserted, or the crucible protection sheet may be in close contact with the outer surface of the inner crucible and the inner surface of the outer crucible. There is. When the crucible protection sheet is sandwiched between the inner crucible and the outer crucible, the crucible protective sheet is bent and deformed so as to be in close contact with the bottom surface of the inner crucible and the inner surface of the outer crucible.
- the strength of the crucible protective sheet itself is weak or the flexibility is small, even if the crucible protective sheet has the compression rate as described above, the inner crucible and the outer crucible are not in contact with each other. When sandwiched between them, the crucible protective sheet itself may be cracked, chipped or torn.
- the thickness of the crucible protection sheet is preferably 0.2 to 0.6 mm. If the thickness of the protective sheet for the crucible is within this range, sufficient cushioning can be taken, and the protective sheet for the crucible is in close contact with the outer surface of the inner crucible and the inner surface of the outer crucible (for the crucible between both crucibles This is because the crucible protection sheet itself can be prevented from being cracked, chipped or torn.
- the force density is 0.5 MgZm 3 or more, the crucible protective sheet has a certain level of strength, so that even if the crucible protective sheet is deformed, cracks and the like can be prevented. However, if the bulk density exceeds 1.5 MgZm 3 , the impact absorbability and deformation capacity absorbability may decrease.
- the thickness is 0.2 to 0.6 mm and the force density is 0.5 to 1.5 MgZm 3 .
- the crucible protective sheet cracks. This is preferable because it is possible to more reliably prevent the impact and absorb the shock and absorb the deformation.
- the crucible protective sheet has a thickness of 0.2 to 0.6 mm, particularly 0.4 to 0.6 mm.
- the crucible protective sheet is maintained in a state where it can be further compressed and deformed. Then, when the entire crucible is cooled after the production of single crystal silicon, the difference in the amount of contraction is different even if the amount of contraction of the outer crucible is larger than the amount of contraction of the inner crucible due to the difference in the thermal expansion coefficient of the material.
- the crucible protective sheet can be absorbed. In other words, the force that can relieve the expansion and contraction stress generated between the crucibles when the crucible is cooled, and the crucible can be prevented from being damaged during the crucible cooling.
- a plurality of crucible protective sheets are used in an overlapping manner, the strength can be improved even if the thickness of a single crucible protective sheet is small, and the buffer opening is enlarged. Therefore, cracking of the crucible protective sheet can be prevented, and cushioning properties can be improved.
- a single crucible protective sheet may be used in an overlapping manner, or a multi-layer sheet formed in advance by overlapping a plurality of crucible protective sheets may be used.
- the gap fluctuation amount restores the thickness of the crucible protective sheet.
- the space between the inner crucible and the outer crucible can be always filled with the protective sheet for crucible.
- the restoration rate is based on the joint sheet JIS R 3453.
- t is the thickness after applying preload (0.686 MPa ⁇ l%) for 15 seconds.
- t is the thickness (mm) after 60 seconds of total pressure (34.3 MPa ⁇ l%), t
- Crucible protection sheet of the present invention is adjusted to be smaller so the gas permeability force 1. 0 X 10- 4 cm 2 Zs .
- Tends to the compression ratio is high gas permeability increases (see FIG. 9), if set to be smaller than 1. 0 X 10- 4 cm 2 / s the gas permeability, the protective sheet for crucibles Compression ratio Even within the above-described range, it is possible to prevent the SiO gas generated when the inner crucible is heated from passing through the crucible protective sheet. As a result, it is possible to prevent the outer crucible from becoming SiC by reacting with the outer crucible through the SiO gas that has passed through the protective sheet for the crucible, so that the life of the outer crucible can be extended and the production cost of the silicon single crystal can be increased. You can reduce IJ.
- the SiO gas permeates the crucible protective sheet, it flows between the crucible protective sheet and the outer crucible, and the SiO gas is heated. Then, SiO gas convection is generated between the crucible protection sheet and the outer crucible, and the outer crucible may be scraped by this convection, and the outer crucible may be thinned. In particular, this phenomenon is often seen in the R part of the crucible (see the curve part, see part A in Fig. 2), and the outer crucible may be formed when such thinning progresses.
- the crucible protective sheet has a gas permeability as described above, it is difficult to completely prevent gas permeation.
- the crucible protective sheet has the compression rate and the restoration rate as described above, the crucible protective sheet can always be buried between the inner crucible and the outer crucible. Then, since there is no gap for convection of SiO gas between both crucibles, the effect of suppressing the thinning of the outer crucible can be enhanced.
- the crucible of the present invention can be used only to prevent the strong convection.
- the protective sheet may be provided only near the part.
- a plurality of crucible protective sheets are stacked or a multilayer sheet consisting of a plurality of crucible protective sheets is used, even if the gas shielding performance of a single sheet is not so high, the gas shielding performance can be improved. Can do.
- the quartz inner crucible has a thermal conductivity of about 2 WZ (mK)
- the crucible protective sheet of the present invention has a thermal conductivity of 120 WZ (m'K) or more in the surface direction. is there. Since the temperature of the inner surface of the outer crucible does not necessarily have a uniform temperature distribution at the start of heating, there is a possibility that a temperature distribution will also occur during the heating of the crucible protective sheet. However, if the thermal conductivity in the surface direction of the protective sheet for crucibles of the present invention is 120 WZ (m′K) or more as described above, a uniform temperature distribution is obtained in a very short time. Accordingly, since the quartz inner crucible having a very low thermal conductivity in the surface direction can be heated almost uniformly, the temperature of the silicon in the inner crucible can also be made substantially uniform. Crystal quality can be dramatically improved.
- the crucible protective sheet of the present invention is adjusted so that the thermal conductivity in the plane direction is 120 WZ (mK) or more, and the thermal conductivity in the plane direction is substantially uniform in the plane.
- a part of the crucible protective sheet is cut out to form a square test piece having a side of 200 mm, and in this test piece, a plurality of square test pieces having a side of 25 mm are formed.
- the difference between the thermal conductivity value in the test region where the thermal conductivity is maximum and the thermal conductivity value in the test region where the thermal conductivity is minimum is calculated as the thermal conductivity in all test regions.
- the value divided by the average rate is adjusted to be 0.1 or less.
- the thermal conductivity of the crucible protective sheet is not uniform, there is a possibility that a heat spot having a low thermal conductivity is formed at a part and a heat spot having a higher temperature than the other part.
- a heat spot is formed on the crucible protection sheet, only the portion of the inner quartz crucible that is in contact with the heat spot may be hotter than the other portions. Then, if the silicon in the inner crucible does not reach a uniform temperature, the quality of the silicon single crystal deteriorates, or the softness advances only in that part of the inner crucible and the inner crucible is removed. It can happen.
- the protective sheet for crucible of the present invention is manufactured so that the thermal conductivity has the characteristics as described above. Therefore, the poor quality of the silicon single crystal prevents the softness of the inner crucible and the like. It can be done.
- the crucible protective sheet of the present invention can be manufactured so that the thermal conductivity is substantially uniform in the plane as described above.
- the expanded graphite is compressed by roll rolling at a feed rate of 20. OmZmin, it is possible to prevent wrinkles and the like from being generated on the surface of the protective sheet for the crucible. It is possible to prevent the formation of a portion having a reduced thermal conductivity. Therefore, a crucible protective sheet with uniform thermal conductivity can be produced.
- the feed rate is less than 0.1 lm / min, the productivity of expanded graphite decreases. Therefore, it is preferable that the feed rate is 0.1 to 20.0 mZmin. In particular, it is preferable that the feed rate is regulated to 0.5-15. OmZmin.
- the crucible protective sheet 4 is preferably adjusted so that the amount of the specific element among the plurality of impurities mixed in the crucible is 3 massppm or less, preferably lmassppm or less.
- the specific element refers to a metalloid element and a metal element. Examples of the metalloid element include boron, phosphorus, arsenic, antimony, and bismuth. Examples of the metal element include iron and indium. The reason for this restriction is that these elements, when mixed in polycrystalline silicon, which is the raw material for single crystal silicon, have a large effect on the quality of the manufactured single crystal silicon and its manufacturing process. .
- the amount of the specific element that greatly affects the quality of the single crystal silicon is suppressed. If the protective sheet 4 is used, the overall quality of the protective sheet 4 for the crucible is not so high, but it is possible to effectively suppress the occurrence of product quality anomalies and defects in the manufacturing process. Therefore, the production of the crucible protective sheet 4 and the quality control of the crucible protective sheet 4 are facilitated, and the product quality can be kept high while suppressing the production cost of the product.
- the total amount of the selected plurality of specific elements should be lOmassppm or less, preferably 5 massppm or less. I like it!
- the outer crucible 3 is adjusted (purified) so that the content of impurities (total ash content) is 20 massppm or less, more preferably lOmassppm or less.
- the crucible protective sheet 4 is mixed. It is adjusted (purified) so that the content of impurities (total ash content) is lOOmassppm or less, preferably 50 massppm or less.
- the crucible device of the present invention by setting the ash content of the outer crucible 3 to 20 massppm or less, a high purity product with a ash content equivalent to the conventional crucible protection sheet 4, for example, more than 50 massppm and less than lOOmassppm. It became possible to get.
- the weight is about 30 kg. Therefore, if the ash content is 20 massppm, the ash content is about 0.6 g. And when the entire inner surface of this outer crucible 3 is covered with the crucible protection sheet 4, the size of the crucible protection sheet 4 is about ⁇ 480mm, so the thickness is lmm and the force density is 1.5Mg Zm. If it is 3 , its weight is about 270g.
- the ash content of the crucible protection sheet 4 If the strength is SlOOmassppm, the amount of ash contained in the crucible protection sheet 4 is about 0.03 g, and the total amount of ash in the whole crucible device is about 0.63 g. It becomes.
- the total amount of ash combined with the ash contained in the outer crucible 3 and the protective crucible 4 for crucible should be small, so that the amount of impurities mixed in the material can be suppressed. Yes. Also, it is not necessary to increase the quality of each member more than necessary. In particular, the quality of the crucible protection sheet 4 that is difficult to purify does not need to be increased more than necessary. Therefore, the manufacture and quality control of the outer crucible 3 and the crucible protection sheet 4 are easy, and the product manufacturing cost Product quality can be kept high while suppressing
- the outer crucible 3 has an ash content of 20 massppm or less, preferably less than lOmassppm, because the production and quality control of the outer crucible 3 and product quality maintenance can be performed efficiently.
- the ash content of the crucible protection sheet 4 is about lOOmassp pm, preferably about 50 massppm, it is preferable because the production, quality control and product quality maintenance of the crucible protection sheet 4 can be performed efficiently.
- the method of adjusting the outer crucible 3 and the crucible protective sheet 4 to ash as described above is not particularly limited.
- the outer crucible 3 and the crucible protective sheet 4 are brought into contact with halogen gas.
- impurities can be removed.
- an expanded graphite sheet having a predetermined bulk density in the presence of a halogenated organic substance under a reduced pressure of 100 to 1 Torr or less, 800 ° It can be prepared by heat-treating for 5 to 24 hours at C or more, and then compression-molding after cooling.
- the ash (impurity) concentration of the crucible protection sheet was adjusted to 10 massppm or less.
- protective sheet for the crucible the bulk density 0.1, 0.3, 0.5, 0.7, 1.0, 1.5, 1. and 7 mg / m 3 0. thickness 1 , 0.2, 0.4, 0.6, 1. Omm.
- the ash (impurity) concentration of the crucible protective sheet was adjusted to 10 massppm or less.
- the crucible protection sheet placed on the inner surface of the outer crucible, insert the inner crucible into the outer crucible and visually check for damage to the crucible protection sheet to evaluate bending and cushioning. did.
- the crucible protection sheet does not crack, break or chip, and the cracks are also excellent in cushioning. Is shown in Table 1 as ⁇ when the tolerance is acceptable, ⁇ when any of the flexibility and shock absorbing properties are bad, and ⁇ when both are bad.
- the strength of the crucible protection sheet generally increases as the bulk density increases, but as shown in Table 1, the thickness of the crucible protection sheet is thin. If it is too large (0.1 mm), sufficient strength cannot be obtained even if the height density is increased. For this reason, when a crescent crucible is applied to the crucible protective sheet, it may be broken, cracked or chipped. Also, there are not enough buffer holes. On the other hand, if the thickness of the crucible protective sheet is too thick (lmm), there are sufficient buffer holes and sufficient strength, so workability will not deteriorate, but flexibility will deteriorate. When the crucible is attached to the crucible protective sheet, cracking or chipping will occur.
- the crucible protective sheet thickness is lmm because the strength is insufficient, and when the crucible protective sheet is subjected to bending force, cracking or chipping occurs.
- the force density is 1.7 Mg / m 3 , the compressibility is low and the thickness is large, so that there is no sufficient buffer opening.
- the protective sheet thickness for the crucible is 0.2 to 0.6 mm and the strength density is 0.5 to 1.5 MgZm 3 , a sufficient cushioning force can be obtained.
- the strength of the crucible protection sheet can be increased while maintaining flexibility.
- the thickness of the protective sheet for the crucible is 0.4 to 0 In the case of 6 mm, the buffer mouth becomes large and the sheet strength increases, which is preferable. Further, when a plurality of such crucible protective sheets are stacked, the crucible protective sheet itself is thin, so that cracks and chips do not occur, and the cushioning property and gas shielding property can be further improved.
- the gas permeability represented by the above formula (1) the gas permeability represented by the above formula (2), and the thermal conductivity were examined.
- Force density is 0.1, 0.3, 0.5, 0.7, 1.0, 1.5, 1 . definitive when the 7 mg / m 3, compression rate, gas permeability and Make a thermal conductivity 0
- a passage (diameter 10 mm) communicating both chambers CA and CB is closed with the crucible protection sheet (diameter 30 mm) of the present invention.
- air does not flow between the pair of sealed chambers CA and CB unless they pass through the crucible protection sheet.
- both chambers one CA the air pressure in the CB is 1. 0 X 10- 4 Pa become until both Chiya members CA, evacuated the CB. While evacuating one chamber CA, N gas is supplied until the other chamber CB reaches a predetermined pressure (1.0 X 10 5 Pa).
- Q is the gas flow rate (Pa'cm 3 Zs), ⁇ ⁇ is the same for both chambers CA, C Pressure difference between B (Pa), A is the gas permeation area of the crucible protection sheet, that is, the area of the passage that communicates both chambers CA and CB (cm 2 ), L is the crucible protection sheet (test piece) Thickness (cm).
- the gas flow rate Q is calculated as follows: the evacuation in one chamber CA is stopped, and the force rises in one chamber CA for about 100 seconds, and the volume force of one chamber CA is calculated.
- the variation in thermal conductivity is obtained by cutting nine 25 x 25 mm test pieces from the 200 x 200 mm crucible protective sheet of the present invention, and the maximum (Max) and minimum values of the thermal conductivity in the surface direction of each test piece. The value obtained by dividing the difference in (Min) by the average thermal conductivity (Ave.) was compared.
- the variation in thermal conductivity is 0.1. It was as follows, and it was confirmed that the thermal uniformity was excellent.
- the protective sheet for crucible of the present invention is suitable for a sheet used for protecting outer crucibles and inner crucibles for soaking silicon single crystals or the like by the CZ method, or for soaking.
- FIG. 1 is a schematic explanatory diagram of equipment for producing a silicon single crystal or the like.
- FIG. 2 is a partially enlarged explanatory view of FIG.
- FIG. 3 A graph showing the relationship between the strength density, compression rate, and restoration rate of the crucible protection sheet.
- FIG. 4 is a graph showing the relationship between the compression rate and the restoration rate in the crucible protective sheet.
- FIG. 5 is a graph showing the relationship between the force density and the compressibility of the crucible protective sheet.
- FIG. 6 is a graph showing the relationship between the force density and the thermal conductivity in the crucible protective sheet.
- FIG. 7 is a graph showing the relationship between force density and gas permeability in a crucible protective sheet.
- FIG. 8 is a graph showing the relationship between compressibility and thermal conductivity in a crucible protective sheet.
- FIG. 9 is a graph showing the relationship between compressibility and gas permeability in the crucible protective sheet.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020087028660A KR101498740B1 (ko) | 2006-07-14 | 2007-07-09 | 도가니용 보호 시트 및 이 도가니용 보호 시트를 이용한 도가니 장치 |
EP07790482.9A EP2042622A4 (en) | 2006-07-14 | 2007-07-09 | PROTECTIVE FOIL FOR LID AND LOCKING DEVICE THEREFOR |
US12/373,182 US8864908B2 (en) | 2006-07-14 | 2007-07-09 | Crucible protection sheet and crucible apparatus using the crucible protection sheet |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006193620A JP2008019139A (ja) | 2006-07-14 | 2006-07-14 | るつぼ用保護シート |
JP2006-193620 | 2006-07-14 | ||
JP2006-193618 | 2006-07-14 | ||
JP2006-193619 | 2006-07-14 | ||
JP2006193619A JP2008019138A (ja) | 2006-07-14 | 2006-07-14 | るつぼ用保護シート |
JP2006193618A JP2008019137A (ja) | 2006-07-14 | 2006-07-14 | るつぼ用保護シート |
JP2006-235255 | 2006-08-31 | ||
JP2006235255 | 2006-08-31 | ||
JP2006309491A JP4774355B2 (ja) | 2006-08-31 | 2006-11-15 | るつぼ用保護シートおよび溶融器具 |
JP2006-309491 | 2006-11-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008007637A1 true WO2008007637A1 (en) | 2008-01-17 |
Family
ID=38923196
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/063661 WO2008007637A1 (en) | 2006-07-14 | 2007-07-09 | Protective sheet for crucible and crucible device using the same |
Country Status (6)
Country | Link |
---|---|
US (1) | US8864908B2 (ja) |
EP (1) | EP2042622A4 (ja) |
KR (1) | KR101498740B1 (ja) |
CN (1) | CN103173851A (ja) |
TW (1) | TWI410533B (ja) |
WO (1) | WO2008007637A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2014207942A1 (ja) * | 2013-06-29 | 2014-12-31 | 株式会社Sumco | シリコン単結晶引き上げ方法 |
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PL2254940T3 (pl) * | 2008-03-20 | 2014-11-28 | Dsm Ip Assets Bv | Radiator z przewodzących materiałów z tworzyw sztucznych |
KR101483687B1 (ko) * | 2010-01-26 | 2015-01-19 | 주식회사 엘지실트론 | 단결정 성장장치용 흑연 도가니 |
CN103080389A (zh) * | 2010-09-06 | 2013-05-01 | 东洋炭素株式会社 | 碳制坩埚 |
DE102011007708A1 (de) * | 2011-04-19 | 2012-10-25 | Sgl Carbon Se | Tiegelanordnung |
WO2012149151A1 (en) * | 2011-04-29 | 2012-11-01 | Graftech International Holdings Inc. | Graphite crucible for silicon crystal production |
USD781942S1 (en) * | 2011-11-18 | 2017-03-21 | Toyo Tanso Co., Ltd. | Graphite sheet for protecting crucible |
CN107082644A (zh) * | 2017-06-28 | 2017-08-22 | 长兴鑫迪耐火材料厂 | 一种快捷连接的耐火砖 |
CN107338475B (zh) * | 2017-07-28 | 2023-08-22 | 晶科能源股份有限公司 | 坩埚护板 |
CN111719180A (zh) * | 2020-07-21 | 2020-09-29 | 江苏利泷半导体科技有限公司 | 适用于氧化镓晶体的生长设备 |
JP2023042297A (ja) * | 2021-09-14 | 2023-03-27 | 株式会社Sumco | ルツボ保護シート及びこれを用いたシリコン単結晶の製造方法 |
CN114873570B (zh) * | 2022-07-11 | 2022-09-27 | 山西中科潞安半导体技术研究院有限公司 | 一种采用pvt法提纯氮化铝粉末的方法及装置 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014207942A1 (ja) * | 2013-06-29 | 2014-12-31 | 株式会社Sumco | シリコン単結晶引き上げ方法 |
JPWO2014207942A1 (ja) * | 2013-06-29 | 2017-02-23 | 株式会社Sumco | シリコン単結晶引き上げ方法 |
US9863059B2 (en) | 2013-06-29 | 2018-01-09 | Sumco Corporation | Method for pulling silicon single crystal |
Also Published As
Publication number | Publication date |
---|---|
EP2042622A1 (en) | 2009-04-01 |
TW200804631A (en) | 2008-01-16 |
CN103173851A (zh) | 2013-06-26 |
KR101498740B1 (ko) | 2015-03-04 |
KR20090037389A (ko) | 2009-04-15 |
TWI410533B (zh) | 2013-10-01 |
US20090308307A1 (en) | 2009-12-17 |
EP2042622A4 (en) | 2014-06-11 |
US8864908B2 (en) | 2014-10-21 |
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