WO2022091635A1 - 単結晶製造装置 - Google Patents
単結晶製造装置 Download PDFInfo
- Publication number
- WO2022091635A1 WO2022091635A1 PCT/JP2021/034488 JP2021034488W WO2022091635A1 WO 2022091635 A1 WO2022091635 A1 WO 2022091635A1 JP 2021034488 W JP2021034488 W JP 2021034488W WO 2022091635 A1 WO2022091635 A1 WO 2022091635A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- chamber
- single crystal
- dope
- shielding member
- Prior art date
Links
- 239000013078 crystal Substances 0.000 title claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 239000002019 doping agent Substances 0.000 claims abstract description 91
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 35
- 239000010453 quartz Substances 0.000 claims description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 230000001154 acute effect Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 45
- 229910052710 silicon Inorganic materials 0.000 description 45
- 239000010703 silicon Substances 0.000 description 45
- 239000002994 raw material Substances 0.000 description 20
- 239000007789 gas Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 238000004804 winding Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 5
- 238000011109 contamination Methods 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/06—Silicon
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
- C30B15/02—Single-crystal growth by pulling from a melt, e.g. Czochralski method adding crystallising materials or reactants forming it in situ to the melt
- C30B15/04—Single-crystal growth by pulling from a melt, e.g. Czochralski method adding crystallising materials or reactants forming it in situ to the melt adding doping materials, e.g. for n-p-junction
Definitions
- the present invention relates to a single crystal manufacturing apparatus, and more particularly to a dopant supply apparatus used for supplying a dopant before or during the pulling step of a single crystal by the Czochralski method (CZ method).
- CZ method Czochralski method
- the silicon single crystals used as substrate materials for semiconductor devices are manufactured by the CZ method.
- a seed crystal is immersed in a silicon melt contained in a quartz turret, and the seed crystal and the quartet are gradually pulled up while rotating to form a single crystal having a large diameter below the seed crystal. It is something that grows.
- the CZ method it is possible to produce a high quality silicon single crystal ingot with a high yield.
- Typical dopants are phosphorus (P), arsenic (As), antimony (Sb), boron (B) and the like. These dopants are put into a quartz crucible together with, for example, a polycrystalline silicon raw material, and are melted together with the silicon raw material by heating with a heater. As a result, a silicon melt containing a predetermined amount of dopant is produced.
- the dopant may be added to the silicon melt during crystal pulling.
- antimon has a lower melting point than phosphorus and boron, and the evaporation rate is very fast under reduced pressure. Therefore, when melted together with a polysaccharide silicon raw material like phosphorus and boron, from the dissolution of the raw material to the beginning of the crystal pulling process
- the dopant evaporates in large quantities, and the dopant concentration in the silicon melt cannot be increased. Therefore, an additional dopant is supplied during crystal pulling, thereby suppressing a decrease in the dopant concentration in the silicon melt.
- Patent Document 1 describes a dope supply pipe that penetrates the upper part of the chamber and reaches above the rutsubo in the chamber, and the dope supply pipe connects the chamber. It is equipped with a sealing cap that seals the penetrating part, a dope hopper attached to the dope supply pipe outside the chamber via a dope supply cock, and a communication pipe that communicates the dope hopper and the inside of the chamber.
- the dope addition device to be used is described.
- the inside of the chamber has an argon gas atmosphere under reduced pressure, but according to this doping agent adding device, the inside of the doping agent adding device can be adjusted to the same atmosphere as the inside of the chamber.
- Patent Document 2 in order to enable the dopant to be supplied to the raw material melt in the crucible without any problem even when the heat shielding member is arranged above the crucible, the inside of the heat shielding member is above the heat shielding member.
- a structure is described in which the dope supply pipe arranged in the above is led out from the middle to the outside of the heat shield member, and at least the lower end portion of the dope supply pipe faces the outside of the heat shield member.
- the conventional dopant supply device has a structure in which a single dopant supply tube is fixed to the chamber or the heat shield member, the parts are often broken or dropped. Further, the conventional dopant supply device cannot cope with a structure in which the heat shielding member can move in the vertical direction, or limits the movement of the heat shielding member.
- an object of the present invention is to provide a single crystal manufacturing apparatus provided with a dopant supply apparatus capable of moving the heat shielding member in the vertical direction without breaking or falling off the parts.
- the single crystal manufacturing apparatus includes a chamber, a crucible installed in the crucible, a heat shielding member arranged above the crucible, and the inside of the crucible from the outside of the chamber.
- the dopant supply device includes a dopant supply tube that penetrates the chamber and reaches above the crucible, and the dopant supply tube is a first dope that penetrates the chamber. It has a tube and a second dope tube separated and independent from the first dope tube and arranged directly under the lower end of the first dope tube, and the first dope tube is separated and independent from the heat shielding member.
- the second dope tube is separated from the chamber and is installed in the heat shield member.
- the present invention it is possible to provide a single crystal manufacturing apparatus that can easily install a dopant supply pipe, does not break or fall off parts, and can cope with the vertical movement of a heat shielding member.
- the first-doped tube and the second-doped tube may be completely separated from each other, or a part of the first-doped tube may be inserted inside the second-doped tube.
- the second dope tube is installed so as to be movable up and down with respect to the heat shield member. According to this configuration, the second dope tube can be easily installed, the parts are not broken or dropped, and the heat shielding member can be moved in the vertical direction.
- the second dope tube has a large diameter portion having an opening diameter larger than the inner diameter of the lower end of the first dope tube, a small diameter portion having an opening diameter smaller than the large diameter portion, and the large diameter portion. It is preferable to have a tapered portion that connects the portion and the small diameter portion.
- the large-diameter portion is arranged above the small-diameter portion, that is, on the first-doped tube side. According to this configuration, the dopant can be reliably transferred from the first-doped tube to the second-doped tube, and the second-doped tube can be easily installed on the heat-shielding member.
- the taper angle (acute angle) of the outer surface of the tapered portion with respect to the vertical axis is preferably equal to or less than the inclination angle of the inner wall surface of the heat shielding member facing the tapered portion with respect to the vertical axis. It is particularly preferable that it is substantially equal to the inclination angle of the inner wall surface of the member.
- the axis of the second dope tube extends linearly from the upper end to the lower end of the second dope tube. This makes it possible to use a second doped tube that is easy to manufacture and inexpensive.
- the dopant supply tube is preferably made of quartz.
- the carbon concentration in the silicon single crystal may increase due to carbon contamination of the dopant.
- the dopant supply tube is made of quartz, it is possible to prevent impurity contamination of the dopant. Quartz tubes are fragile at room temperature and may be thermally deformed at high temperatures. However, when the second doped tube is simply inserted into the through hole of the heat shielding member, it is possible to prevent the dopant supply tube from being damaged or deformed.
- the heat-shielding member is configured to be able to move up and down in the chamber, and the relative positional relationship between the first-doped tube and the second-doped tube changes according to the elevation of the heat-shielding member. It is preferable to do so. According to this, the total length of the dopant supply pipe can be adjusted according to the vertical movement of the heat shielding member, and the vertical movement of the heat shielding member is not limited by the dopant supply pipe. Further, when the heat shielding member is movable up and down, even if the crucible is filled with a pile of solid raw materials, the heat shielding member can be retracted upward to avoid interference between the heat shielding member and the solid raw material. The initial charge amount of the melt can be increased.
- the chamber has a main chamber in which the rutsubo is installed and a top chamber that covers the upper opening of the main chamber, and the top chamber is configured to be detachable from the main chamber and is configured to be removable from the main chamber. It is preferable that the relative positional relationship between the first-doped tube and the second-doped tube changes according to the attachment / detachment of the chamber. In this case, since the first dope tube is fixed to the top chamber side and the second dope tube is attached to the heat shield member in the main chamber, the top chamber is attached to or removed from the main chamber. The work is easy.
- the second-doped tube is inserted into a through hole formed in the heat-shielding member, and the lower end of the second-doped tube is not exposed and is inside the lower opening end of the through hole. It is preferably terminated and the lower end of the second dope tube is preferably covered with a carbon ring cap. Since the second dope tube is only inserted into the through hole of the heat shielding member, its installation is easy. Further, since the lower end of the second dope tube is covered with the ring cap without being exposed, the lower end of the second dope tube can be protected from heat, and thermal deformation and the like can be prevented.
- the outer opening of the ring cap is diagonally downward and faces the side wall portion of the crucible.
- the present invention it is possible to provide a single crystal manufacturing apparatus provided with a dopant supply apparatus capable of moving the heat shielding member in the vertical direction without breaking or falling off of parts.
- FIG. 1 is a schematic side sectional view showing a configuration of a single crystal manufacturing apparatus according to an embodiment of the present invention.
- FIG. 2 is an enlarged view of the dopant supply device of FIG.
- FIG. 3 is a schematic cross-sectional view showing a state in which the heat shielding member is raised in the preparatory stage before starting the crystal pulling step.
- FIG. 4 is a schematic side sectional view showing a state in which the chamber is disassembled.
- FIG. 1 is a schematic side sectional view showing a configuration of a single crystal manufacturing apparatus according to an embodiment of the present invention.
- the single crystal manufacturing apparatus 1 can raise and lower and rotate the chamber 10, the quartz crucible 12 installed in the chamber 10, the graphite susceptor 13 supporting the quartz crucible 12, and the susceptor 13.
- a shaft 14 supported on the surface, a heater 15 arranged around the susceptor 13, a heat shielding member 16 arranged above the quartz crucible 12, and a heat shielding member 16 arranged above the quartz crucible 12 coaxially with the shaft 14.
- the single crystal pulling wire 17 is provided, a wire winding mechanism 18 arranged above the chamber 10, and a dopant supply device 20 for supplying a dopant in the quartz crucible 12.
- the chamber 10 is composed of a main chamber 10a, a top chamber 10b that covers the upper opening of the main chamber 10a, and an elongated cylindrical pull chamber 10c connected to the upper opening of the top chamber 10b.
- the susceptor 13, the heater 15, and the heat shielding member 16 are provided in the main chamber 10a.
- the susceptor 13 is fixed to the upper end of a shaft 14 provided in the vertical direction through the center of the bottom of the chamber 10, and the shaft 14 is moved up and down and rotationally driven by the shaft drive mechanism 19.
- the heater 15 is used to melt the polycrystalline silicon raw material filled in the quartz crucible 12 to generate the silicon melt 3.
- the heater 15 is a carbon resistance heating type heater, and is provided so as to surround the quartz crucible 12 in the susceptor 13.
- a heat insulating material 11 is provided on the outside of the heater 15. The heat insulating material 11 is arranged along the inner wall surface of the main chamber 10a, whereby the heat retaining property in the main chamber 10a is enhanced.
- the heat shielding member 16 is provided to prevent the silicon single crystal 2 from being heated by the radiant heat from the heater 15 and the quartz crucible 12 and to suppress the temperature fluctuation of the silicon melt 3.
- the heat shielding member 16 is a substantially cylindrical member whose diameter decreases from the upper side to the lower side, and is provided so as to cover the upper part of the silicon melt 3 and surround the growing silicon single crystal 2. It is preferable to use graphite as the material of the heat shielding member 16. Since the lower end of the heat shielding member 16 is located inside the quartz crucible 12, even if the quartz crucible 12 is raised, it does not interfere with the heat shielding member 16. An opening larger than the diameter of the silicon single crystal 2 is provided in the center of the heat shielding member 16, and the silicon single crystal 2 is pulled upward through the opening.
- the heat shielding member 16 is configured to be able to move up and down in the chamber 10.
- the heat shielding member 16 may be lifted by a jack or the like, or may be pulled up by a wire or the like.
- the heat shielding member 16 is movable up and down, even if the quartz crucible 12 is filled with a pile of solid silicon raw materials, the heat shielding member 16 is retracted upward to avoid interference between the heat shielding member 16 and the solid silicon raw material.
- the initial charge amount of the silicon melt 3 in the quartz crucible 12 can be increased.
- FIG. 1 shows a state in which the silicon single crystal 2 being grown is suspended from the wire 17.
- a gas intake port 10d for introducing argon gas into the chamber 10 is provided in the upper part of the pull chamber 10c, and a gas exhaust port 10e for exhausting the argon gas in the chamber 10 is provided at the bottom of the main chamber 10a. Is provided. Argon gas is introduced into the chamber 10 from the gas intake port 10d, and the introduction amount thereof is controlled by a valve. Further, since the argon gas in the closed chamber 10 is exhausted to the outside of the chamber from the gas exhaust port 10e, it is possible to recover the SiO gas and CO gas in the chamber 10 and keep the inside of the chamber 10 clean. ..
- the dopant supply device 20 has a dopant supply tube 21 whose lower end reaches above the quartz rut 12 through the chamber 10 and a dopant hopper 22 installed outside the chamber 10 and connected to the upper end of the dopant supply tube 21. And a seal cap 23 for sealing the opening 10f of the top chamber 10b through which the dopant supply pipe 21 penetrates.
- a polycrystalline silicon raw material is filled in the quartz crucible 12 and a seed crystal is attached to the tip of the wire 17.
- the silicon raw material in the quartz crucible 12 is heated by the heater 15 to generate the silicon melt 3.
- the seed crystal is necked by the dash neck method in order to make the single crystal dislocation-free.
- a shoulder portion whose diameter is gradually expanded in order to obtain a single crystal having a required diameter is grown, and a body portion whose diameter is maintained constant is grown when the single crystal reaches a desired diameter.
- the tail portion is grown in order to separate the single crystal from the silicon melt 3 in a dislocation-free state.
- the dopant 5 is supplied from the dopant supply device 20 to the silicon melt 3 immediately before the start of pulling up the silicon single crystal 2 or during the crystal pulling process.
- FIG. 2 is an enlarged view of the dopant supply device 20 of FIG.
- the dopant supply device 20 includes a dopant supply tube 21 that penetrates the chamber 10 and reaches above the quartz crucible 12, and a dopant hopper 22 connected to the upper end of the dopant supply tube 21. It is provided with a seal cap 23 for sealing the opening 10f formed in the top chamber 10b.
- the dopant raw material supplied from the dopant hopper 22 is transferred into the chamber 10 through the dopant supply pipe 21.
- the dopant supply tube 21 is made of quartz glass, and has a first dope tube 24 drawn into the main chamber 10a through the opening 10f of the top chamber 10b and a lower end of the first dope tube 24 in the main chamber 10a. It is composed of a second dope tube 25 arranged directly under the above.
- the first dope tube 24 is a quartz glass tube that winds so as to reach directly above the second dope tube 25 from the installation position of the dopant hopper 22 through the opening 10f of the top chamber 10b.
- the first dope tube 24 is fixed to the top chamber 10b via the seal cap 23.
- the first dope tube 24 is separated and independent from the heat shielding member 16.
- the second dope tube 25 has a large diameter portion 25a having an opening diameter larger than that of the lower end of the first dope tube 24, a tapered portion 25b having a gradually smaller opening diameter, and an opening diameter smaller than that of the large diameter portion 25a. It has a small diameter portion 25c. That is, the second dope tube 25 has a funnel shape in which the opening size at the upper end thereof is wider than the opening size at the lower end portion.
- the central axis of the second dope tube 25 extends linearly from the upper end to the lower end and does not have a bent portion. Therefore, the second dope tube 25 can be attached to the heat shielding member 16 simply by inserting the small diameter portion 25c of the second dope tube 25 into the through hole 16a. Since the shape of such a second dope tube 25 is relatively simple, it is easy to manufacture and the manufacturing cost is low.
- the second dope tube 25 is only inserted into the through hole 16a of the heat shield member 16 and is installed so as to be movable up and down with respect to the heat shield member 16. Further, the second dope tube 25 is separated and independent from the chamber 10.
- the heat shielding member 16 is provided with a through hole 16a that penetrates vertically from the inner peripheral surface side to the outer peripheral surface side thereof, and the small diameter portion 25c of the second dope tube 25 is inserted into the through hole 16a. Since the small diameter portion 25c of the second dope tube 25 is surrounded by the heat shielding member 16, the influence of radiant heat from the heater 15 and the silicon melt 3 is suppressed to prevent thermal deformation of the second dope tube 25. Can be done.
- the taper angle (acute angle) of the outer surface of the tapered portion 25b of the second doped tube 25 with respect to the vertical axis is substantially equal to the inclination angle of the inner wall surface 16b of the heat shielding member 16 facing the tapered portion 25b with respect to the vertical axis.
- the apex of the taper angle is the lower end of the taper portion 25b.
- the taper angle of the outer surface of the tapered portion 25b may be smaller than the inclination angle of the inner wall surface 16b facing the tapered portion 25b.
- the second dope tube 25 is supported by the heat shield member 16 at one point at the base of the tapered portion 25b, but can be supported without any problem.
- both the first dope tube 24 and the second dope tube 25 are made of quartz.
- the carbon concentration in the silicon single crystal increases due to carbon contamination of the dopant.
- both the first dope tube 24 and the second dope tube 25 are made of quartz, impurity contamination of the dopant can be prevented.
- the quartz tube is easily broken at room temperature and may be thermally deformed at high temperature, but the second doped tube 25 is simply inserted into the through hole 16a of the heat shielding member 16 and is firmly screwed or the like. Not only is it easy to install, but it is also possible to prevent damage and deformation of the second dope tube 25.
- the lower end of the small diameter portion 25c of the second dope tube 25 inserted into the through hole 16a of the heat shielding member 16 is terminated inside the lower opening end of the through hole 16a without being exposed, and the second dope tube 25 is terminated.
- the lower end of the ring cap 16c is covered with a SiC-coated carbon ring cap. Therefore, the lower end portion of the second dope tube 25 can be protected from heat, and thermal deformation and the like can be prevented.
- the outer opening of the ring cap 16c faces diagonally downward toward the side wall of the quartz crucible 12.
- the dopant 5 can be charged as close to the inner wall surface as possible in the quartz crucible 12 (see FIG. 1), and the liquid of the melt at the time of charging can be charged. It is possible to prevent bounce and dislocation of a single crystal.
- the granular dopant 5 is additionally supplied from the dopant supply device 20 to the silicon melt 3 in the quartz crucible 12 immediately before the start of pulling up the silicon single crystal 2 and during the crystal pulling step.
- the dopant 5 discharged from the dopant hopper 22 is supplied to the silicon melt 3 through the first-doped tube 24 and the second-doped tube 25.
- FIG. 3 is a schematic cross-sectional view showing a state in which the heat shielding member 16 is raised in the preparatory stage before starting the crystal pulling process.
- FIG. 4 is a schematic side sectional view showing a state in which the chamber 10 is disassembled.
- the chamber 10 is composed of a combination of a main chamber 10a, a top chamber 10b, and a pull chamber 10c, which can be disassembled as shown in the figure.
- the dopant supply tube 21 is divided into a first dope tube 24 and a second dope tube 25, the top chamber 10b can be easily removed and attached to the main chamber 10a.
- the relative positional relationship between the first dope tube 24 and the second dope tube 25 changes according to the attachment / detachment of the top chamber 10b.
- the single crystal manufacturing apparatus 1 since the dopant supply pipe 21 for sending the dopant from the outside to the inside of the chamber 10 is divided into two, the single crystal manufacturing apparatus 1 moves in the vertical direction of the heat shielding member 16.
- the total length of the dopant supply pipe 21 can be adjusted according to the above.
- the second dope tube 25 is only inserted into the through hole 16a of the heat shielding member 16, not only the installation thereof is easy, but also damage and deformation can be prevented.
- the dopant supply tube 21 is composed of two independent dope tubes 24 and 25, but it is also possible to use three or more dope tubes.
- the first dope tube 24 and the second dope tube 25 are separated from each other without overlapping in the vertical direction, but it is also possible to overlap them.
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
2 シリコン単結晶
3 シリコン融液
4 固体シリコン原料
5 ドーパント粒
10 チャンバー
10a メインチャンバー
10b トップチャンバー
10c プルチャンバー
10d ガス吸気口
10e ガス排気口
10f 開口部
11 断熱材
12 石英ルツボ
13 サセプタ
14 シャフト
15 ヒータ
15b テーパー部
16 熱遮蔽部材
16a 熱遮蔽部材の貫通穴
16b 熱遮蔽部材の内壁面
16c リングキャップ
17 ワイヤー
18 ワイヤー巻き取り機構
19 シャフト駆動機構
20 ドーパント供給装置
21 ドーパント供給管
22 ドーパントホッパー
23 シールキャップ
24 第1ドープ管
25 第2ドープ管
25a 大径部
25b テーパー部
25c 小径部
Claims (10)
- チャンバーと、
前記チャンバー内に設置されたルツボと、
前記ルツボの上方に配置された熱遮蔽部材と、
前記チャンバーの外側から前記ルツボ内にドーパントを供給するドーパント供給装置とを備え、
前記ドーパント供給装置は、前記チャンバーを貫通して前記ルツボの上方に達するドーパント供給管を含み、
前記ドーパント供給管は、前記チャンバーを貫通する第1ドープ管と、前記第1ドープ管から分離独立して前記第1ドープ管の下端の直下に配置された第2ドープ管とを有し、
前記第1ドープ管は、前記熱遮蔽部材から分離独立しており、
前記第2ドープ管は、前記チャンバーから分離独立しかつ前記熱遮蔽部材に設置されていることを特徴とする単結晶製造装置。 - 前記第2ドープ管は前記熱遮蔽部材に対して上下動可能に設置されている、請求項1に記載の単結晶製造装置。
- 前記第2ドープ管は、前記第1ドープ管の下端の内径よりも大きな開口径を有する大径部と、前記大径部よりも小さな開口径を有する小径部と、前記大径部と前記小径部とを接続するテーパー部とを有する、請求項1又は2に記載の単結晶製造装置。
- 前記テーパー部の外面の鉛直軸に対するテーパー角度(鋭角)は、前記テーパー部と対向する前記熱遮蔽部材の内壁面の前記鉛直軸に対する傾斜角度以下である、請求項3に記載の単結晶製造装置。
- 前記第2ドープ管の軸線が当該第2ドープ管の上端から下端まで直線状に伸びている、請求項1乃至4のいずれか一項に記載の単結晶製造装置。
- 前記ドーパント供給管は石英製である、請求項1乃至5のいずれか一項に記載の単結晶製造装置。
- 前記熱遮蔽部材は前記チャンバー内で昇降自在に構成されており、前記熱遮蔽部材の昇降に応じて、前記第1ドープ管と前記第2ドープ管の相対的な位置関係が変化する、請求項1乃至6のいずれか一項に記載の単結晶製造装置。
- 前記チャンバーは、前記ルツボが設置されるメインチャンバーと、前記メインチャンバーの上部開口を覆うトップチャンバーとを有し、前記トップチャンバーは前記メインチャンバーから着脱可能に構成されており、前記トップチャンバーの着脱に応じて、前記第1ドープ管と前記第2ドープ管の相対的な位置関係が変化する、請求項1乃至7のいずれか一項に記載の単結晶製造装置。
- 前記第2ドープ管は前記熱遮蔽部材に形成された貫通穴に挿入されており、前記第2ドープ管の下端は露出することなく前記貫通穴の下側開口端よりも内側で終端されており、前記第2ドープ管の下端はカーボン製のリングキャップに覆われている、請求項1乃至8のいずれか一項に記載の単結晶製造装置。
- 前記リングキャップの外側開口は、斜め下方であって前記ルツボの側壁部側を向いている、請求項9に記載の単結晶製造装置。
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH03290392A (ja) * | 1990-04-03 | 1991-12-20 | Nkk Corp | 単結晶製造装置 |
JP2001010892A (ja) * | 1999-06-22 | 2001-01-16 | Mitsubishi Materials Silicon Corp | シリコン単結晶引上げ装置の多結晶シリコンの融解方法 |
JP2010143777A (ja) * | 2008-12-17 | 2010-07-01 | Sumco Techxiv株式会社 | シリコン単結晶引上装置 |
JP2018070428A (ja) * | 2016-11-01 | 2018-05-10 | 信越半導体株式会社 | 単結晶引上げ装置 |
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JPH09227275A (ja) | 1996-02-28 | 1997-09-02 | Sumitomo Sitix Corp | ドープ剤添加装置 |
JP4075136B2 (ja) | 1998-06-01 | 2008-04-16 | 株式会社Sumco | 単結晶育成装置 |
JP5329143B2 (ja) * | 2008-07-30 | 2013-10-30 | Sumco Techxiv株式会社 | シリコン単結晶引上装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH03290392A (ja) * | 1990-04-03 | 1991-12-20 | Nkk Corp | 単結晶製造装置 |
JP2001010892A (ja) * | 1999-06-22 | 2001-01-16 | Mitsubishi Materials Silicon Corp | シリコン単結晶引上げ装置の多結晶シリコンの融解方法 |
JP2010143777A (ja) * | 2008-12-17 | 2010-07-01 | Sumco Techxiv株式会社 | シリコン単結晶引上装置 |
JP2018070428A (ja) * | 2016-11-01 | 2018-05-10 | 信越半導体株式会社 | 単結晶引上げ装置 |
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