WO2002064866A1 - Procede de fabrication d"un monocristal de silicium - Google Patents
Procede de fabrication d"un monocristal de silicium Download PDFInfo
- Publication number
- WO2002064866A1 WO2002064866A1 PCT/JP2002/001388 JP0201388W WO02064866A1 WO 2002064866 A1 WO2002064866 A1 WO 2002064866A1 JP 0201388 W JP0201388 W JP 0201388W WO 02064866 A1 WO02064866 A1 WO 02064866A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- single crystal
- silicon single
- silicon
- crystal
- magnetic field
- Prior art date
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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
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- 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
- C30B15/20—Controlling or regulating
- C30B15/203—Controlling or regulating the relationship of pull rate (v) to axial thermal gradient (G)
-
- 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
- C30B15/30—Mechanisms for rotating or moving either the melt or the crystal
- C30B15/305—Stirring of the melt
Definitions
- the present invention relates to a method for efficiently producing a silicon single crystal having excellent device characteristics such as an oxide film breakdown voltage characteristic by using the Czochralski method (hereinafter referred to as “CZ method”).
- CZ method Czochralski method
- Silicon wafers used in the manufacture of semiconductor devices are mainly manufactured from single crystal silicon grown by the CZ method.
- a seed crystal is immersed in a silicon melt melted in a quartz crucible, and the seed crystal is pulled up while rotating the quartz crucible and the seed crystal, thereby growing a cylindrical silicon single crystal at the lower end of the seed crystal. It is a way to make it.
- defects called COP or dislocation class may be formed. These defects are not newly formed in the crystal due to heat treatment after pulling up by the CZ method, but are formed in the crystal during the process of growing a single crystal, and are called ground-in defects. .
- FIG. 1 is a diagram schematically showing a typical distribution state of the grow-in defects formed in the crystal plane during the process of growing a single crystal. Observation of the state of distribution of the grown-in defects was carried out based on an X-ray topography method after cutting a wafer from a single crystal just after growth, immersing the wafer in an aqueous solution of copper nitrate and attaching Cu, and after heat treatment.
- an oxidation-induced stacking fault (“0 SF”), which is a type of heat-induced defect, appears in a ring shape. I have. Inside the ring-shaped oxidation-induced stacking fault (hereinafter referred to as “R-OSF”) that appears in the wafer plane, C 0 P is generated among the grown-in defects observed in the evaluation after single crystal growth. There is a defect-free area in the area near the inside of the R-0 SF area. In this defect-free area, COPs of 0.1 lm or more are not detected.
- a portion near the outside of the R-OSF region includes an oxygen precipitation promoting region in which oxygen precipitation easily occurs, and an oxygen precipitation suppression region in which oxygen precipitation hardly occurs exists outside the region.
- oxygen precipitation accelerating regions and oxygen precipitation suppressing regions there are no gown-in defects.
- the outside of these regions is where the grown-in defects occur, and these are the defects called dislocation class Yuichi.
- the distribution of the above-mentioned grown-in defects is greatly affected by the pulling speed in the process of growing a single crystal by the CZ method.
- the region where R-0 SF is potentially generated is the outer periphery of the single crystal, and the region where R-0 SF appears as the pulling speed decreases decreases from the outside to the inside of the crystal. It contracts and eventually disappears at the center of the single crystal.
- S F appearing in the wafer plane is an interstitial type dislocation loop generated during oxidation heat treatment.
- OSF is generated and grown on the surface of the wafer, which is the active region of the device, it causes a leak current and degrades the device characteristics.
- the pulling speed during single crystal growth was set as high as possible, for example, by setting the pulling speed to 0.8 mm / min or more, R-OSF could potentially occur.
- the region to be moved was controlled to move to the outer peripheral side of the crystal. As a result, the area where OSFs are generated at a high density was pushed to the outer peripheral side of the 18th face.
- the R-OSF generation region can be moved to the outer periphery of the crystal, so that the single crystal obtained by increasing the pulling speed has excellent productivity and dislocation class Can be obtained.
- large-sized COPs are formed at a high density inside R-0SF, which deteriorates the gate oxide breakdown voltage characteristics of the M0S device.
- Japanese Patent Application Laid-Open No. 2000-327486 discloses a method of growing a silicon single crystal that does not contain COP or dislocation class that degrades the device characteristics by using an axial temperature gradient G in the crystal and a bow I lifting speed.
- V is set
- a method has been proposed to control the in-plane distribution of these ratios V / G and V / G within a certain range.
- the hot zone structure in the CZ furnace is adjusted to increase the axial temperature gradient G in the crystal, but there is a limit in adjusting the hot zone structure from the furnace structure.
- the crystal pulling speed must be considerably reduced, and the production efficiency of the silicon single crystal is low.
- a defect-free region free of COP and dislocation classes can be formed by employing a magnetic field application CZ method, even if a relatively high pulling speed is adopted. It is disclosed that the allowable range of the pulling speed at which this defect-free region can be formed can be expanded. However, even with the method disclosed in this publication, the pulling speed is not sufficient for efficient production in actual single crystal pulling, and the allowable range of the pulling speed at which a defect-free region can be formed is narrow. Was enough. Disclosure of the invention
- a pulling method has been proposed in which a silicon single crystal having a uniform impurity concentration in a crystal plane is obtained by rotating only the silicon melt in the crucible without forcibly rotating the crucible (for example, see Patent No. 2,959,543).
- a method is used in which a magnetic field is applied to the silicon melt and a current perpendicular to the magnetic field is applied to the silicon melt to rotate the melt by the generated Lorentz force.
- This is a method for producing a silicon single crystal called the Electromagnetic-CZ method (hereinafter, referred to as the “EMCZ method”).
- the rotation speed of the melt can be set arbitrarily by rotating the silicon melt by Lorentz force without rotating the crucible and adjusting the applied current. Therefore, the concentration of the impurity element mixed into the crystal can be easily controlled.
- the present inventors have aimed at producing a silicon single crystal in which no grown-in defects are formed or whose density is extremely low even if formed, with high productivity and under a wide allowable range of pulling speed.
- Intensive research was conducted on various silicon single crystal growth methods.
- applying a magnetic field to the silicon melt and pulling the single crystal while applying a current containing a component perpendicular to the magnetic field of the bracket to the silicon melt, that is, using the EMCZ method The present invention has been found to be effective in suppressing the formation of whiskers and at the same time to improve the pulling speed.
- the gist of the present invention is to adjust the pulling speed in the process of growing a single crystal by using the EMCZ method so that the outer diameter of the latent region of OSF appearing in the crystal plane is in the range of 70% to 0% of the crystal diameter.
- This is a method for producing a silicon single crystal grown under the following conditions.
- a wafer cut from a crystal region where the outer diameter of the latent region of 0 SF appearing in the crystal plane is in the range of 70% to 0% of the crystal diameter is a crystal product with excellent oxide film breakdown voltage characteristics It will be a quality wafer. If the outer diameter of the OSF latent area exceeds 70%, a relatively large COP will be generated at a high density at the center of the crystal, and it is necessary to adjust the pulling speed so as not to exceed this. is there.
- the method of the present invention is characterized in that a silicon single crystal in which the outer diameter of the latent region of the OSF is in the range of 70% to 0% of the crystal diameter can be manufactured with high productivity. Absent. However, in the ordinary CZ method or the magnetic field application CZ method, the crucible is rotated, so that the convection of the melt in the crucible is larger near the crucible wall and smaller immediately below the single crystal growth interface. On the other hand, in the EMCZ method, since the silicon melt is directly rotated by the low force, it is expected that relatively large melt convection can be obtained directly under the crystal during growth.
- the temperature gradient in the melt just below the crystal in the EMCZ method becomes smaller than that in the ordinary CZ method or the magnetic field application CZ method, so that the bow I lifting speed and its allowable range increase. It is presumed that.
- the single crystal portion where the outer diameter of the OSF latent region is 70% to 0% of the crystal diameter is It is desirable that the length be 1/3 or more of the length of the straight body of the single crystal.
- the portion of the single crystal in which the outer diameter of the latent region of 0 SF appearing in the crystal plane is 70% to 0% of the crystal diameter is substantially 0. It is desirable to consist of a region that does not contain COPs and dislocation clusters of 1 m or more in size.o
- COPs generated inside the R-0 SF those with a diameter of 0.1 lm or more are extremely stable thermally, so they do not disappear even when subjected to high-temperature heat treatment in the device manufacturing process. It may remain in the active region near the surface and degrade the junction leakage characteristics.
- the dislocation class is a factor that degrades device characteristics. For this reason, in consideration of the growth of higher-quality silicon single crystals, it is effective to adjust the growth conditions so that they substantially consist of a region that does not contain COPs and dislocation classes larger than 0.1 ⁇ m in size. It is.
- the pulling speed is 0.6 to 1. It is desirable to adjust within the range of 6 mm / min. If the pulling speed is slower than 0.6 mm / min, dislocation classes occur at the outer periphery of the crystal, degrading device characteristics. If the pulling speed exceeds 1.6 mm / min, it becomes impossible to adjust the R-OSF generation area to the range of 70% of the crystal diameter. And the oxide breakdown voltage characteristics and the junction leakage characteristics are degraded.
- the temperature gradient at the center of the single crystal in the direction of the bow I lift axis is Gc
- the temperature at the outer periphery of the single crystal is
- the gradient is Ge
- the magnetic field applied to the silicon melt contains a longitudinal magnetic field component.
- the oxygen concentration distribution and the oxygen concentration distribution in the wafer plane are preferable. From the viewpoint of uniformity of the resistivity distribution, it is desirable to apply a cusp magnetic field.
- the method for producing a silicon single crystal according to the present invention it is desirable to apply a magnetic field of 0.03 T or more as the strength of the force sp field applied to the silicon melt. If it is smaller than 0.03 T, the lifting speed cannot be increased because the stirring effect of the silicon melt by the Lorentz force is small.
- the strength of the magnetic field is preferably higher from the viewpoint of crystal quality, but there are restrictions on the structure and performance of the apparatus.
- the current value flowing through the silicon melt is It is desirable that the current be supplied within a range of 1 to 2 OA.
- the current value is smaller than 1 A, the rotation of the silicon melt due to Lorentz force is reduced, and the melt convection just below the single crystal is reduced, so that the pulling speed cannot be increased.
- the current value exceeds 2 OA, the diameter of the neck portion serving as a current passage is usually about 3 mm, and the current resistor becomes large, causing Joule heat to be generated in the neck portion and the strength of the neck portion. There is a problem that decreases.
- the crucible is not rotated during the process of producing the silicon single crystal straight body.
- the convection of the melt immediately below the single crystal growth interface becomes small, and the pulling speed cannot be improved.
- FIG. 1 is a diagram schematically illustrating a typical distribution state of grown-in defects formed in a crystal plane during a single crystal growing process.
- FIG. 2 is a cross-sectional view schematically showing a configuration of a single crystal pulling apparatus used for producing a silicon single crystal of the present invention.
- Fig. 3 shows the pulling rate at which a crystal region (N region) that does not contain COP of 0 .0 or more and a dislocation class is formed on the 18th surface based on the evaluation test results in the examples.
- FIG. 2 is a cross-sectional view schematically showing a configuration of a single crystal pulling apparatus used for producing a silicon single crystal of the present invention.
- the seed crystal 3 is brought into contact with the melt 4 filled in the crucible 1 composed of the quartz crucible 1a and the graphite crucible 1b, and the single crystal 5 is pulled while pulling the seed crystal 3.
- the seed crystal 3 is brought into contact with the surface of the melt 2 by the bow I raising shaft 7, the seed crystal 3 is united while rotating.
- the crystal 5 is pulled up, and a heat shield 9 is provided so as to surround the single crystal to be pulled up.
- the crucible 1 is supported by a crucible elevating shaft 11, and around the crucible 1, a heater 2 for heating the melt 4 and a heat insulating material 10 are provided.
- a pair of upper and lower coils 6a and 6a for applying a magnetic field are provided around the furnace body 8 of the single crystal pulling apparatus so as to face upward and downward with the crucible 1 as a center.
- the coil 6b has a structure in which currents rotating in opposite directions are applied to each other to form a force sp magnetic field in the melt 4 in the crucible.
- the electrode 12 is immersed in the silicon melt 4 in the crucible 1 so that a current flows between the silicon melt 4 and the single crystal 5 from a power supply device 13 provided outside the furnace body 8.
- An electric current is applied to the electrode 12 and the lifting shaft 7 immersed in the melt 4.
- a current is applied in a direction perpendicular to the magnetic field, and the silicon melt 4 is rotated by the generated Lorentz force.
- the average temperature gradient of the central portion of the single crystal in the pulling axis direction in this temperature range is defined as G c in advance by comprehensive heat transfer calculation.
- G e the average temperature gradient at the outer periphery of the single crystal
- a hot zone condition that satisfies the temperature gradient of G c / G e ⁇ 1.0 is determined.
- the single crystal pulling apparatus used in the production method of the present invention includes a relative position between the crucible 1 and the heater 2, a thickness of the heat shield 9, and a tip of the heat shield 9 so as to satisfy a predetermined condition. The distance from the surface of the silicon melt 4 and the structure of the heat insulating material 10 are adjusted.
- the silicon single crystal to be manufactured had an oxygen concentration of 24 ppma, a diameter of 200 mm, a straight body length of 1200 mm, and a crystal orientation of 0 1>.
- 120 kg of polycrystalline silicon material was placed in a 26-inch-diameter quartz crucible, and p-type boron was added so that the electrical resistivity in the single crystal was 10 ⁇ cm.
- the polycrystalline silicon material in the quartz crucible 1a was heated and melted in a cylindrical graphite heater 2 installed around the lead crucible 1b.
- the lower end of the seed crystal 3 is immersed in the melt 4 and the crucible lifting shaft 11 and the raising shaft 7 are rotated in opposite directions, while the bow I lifting shaft 7 is pulled upward to raise the seed crystal.
- a silicon single crystal 5 is grown.
- the surface position of the melt 4 is always kept constant with respect to the positions of the heat sink 2 and the cusp application coil 6.
- a current of ⁇ was applied to generate a circumferential Lorentz force in the silicon melt, thereby rotating the melt in the quartz crucible 1a.
- the crystal rotation speed at this time was 6 rpm, and the crucible rotation speed was 0 rpm.
- the pulling speed is adjusted to 1.0 mm / min, and then the pulling speed is decreased almost linearly according to the pulling length.
- it reached 600 mm it was adjusted to 0.3 mm / min, after which the growth was terminated at the same lifting speed.
- a silicon single crystal was grown by a normal CZ method under the same conditions as the above-described process except that no cusp magnetic field was applied to the silicon melt and no current was applied.
- a silicon single crystal was grown while applying a transverse magnetic field of 0.3 T to the silicon melt. In both cases, the number of rotations of the crucible for forming the straight body of the single crystal was 5 rpm.
- a plurality of wafers perpendicular to the bow I lifting axis were cut out from the axial direction and produced.
- the number of COPs with a size of 0.1 m or more was measured using a surface inspection machine (KLA—Tencor SP-1). Furthermore, dislocation classes present these ⁇ E one tooth after Edzuchin grayed the ⁇ E one tooth surface crushed immersed in Secco solution (K 2 Cr 2 0 7 + HF + H 2 0), the Ueha surface by an optical microscope The evening was inspected.
- FIG. 3 is a diagram showing a pulling speed at which a crystalline region (N region) containing no COP and dislocation clusters having a size of 0.1 ⁇ m or more is formed on the wafer surface based on the above evaluation test results.
- the speed range was about 0.55 ⁇ 0.05 mm / min.
- the pulling speed is in the range of 0.8 ⁇ 0.0 SmmZmin, and it can be seen that the allowable range of the pulling speed is widened as the pulling speed is increased.
- the pulling speed at which the silicon layer 18 consisting of only the oxygen precipitation suppression region was obtained under the conditions of the present invention example was 0.75 ⁇ 0.03 mm / min. Therefore, in the actual process of forming the straight body of the single crystal, the silicon single crystal was pulled at a pulling rate of 0.75 ⁇ 0. The distribution of the occurrence of defects in the straight body of the single crystal was investigated.
- the pulling speed in the process of growing the single crystal is set so that the outer diameter of the latent region of 0 SF is in the range of 70% to 0% of the crystal diameter.
- the degree it is possible to produce silicon single crystals with excellent device characteristics such as oxide film breakdown voltage characteristics without forming COP or dislocation classes of 0.1 ⁇ m or more in the crystal plane. Can be.
- these silicon single crystals can be produced with good productivity and under growing conditions with a wide range of allowable bow I lifting rates, they can be widely used for semiconductor devices.
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- Chemical & Material Sciences (AREA)
- 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 (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02712433A EP1365048B1 (en) | 2001-02-16 | 2002-02-18 | Method for fabricating silicon single crystal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001039556A JP4150167B2 (ja) | 2001-02-16 | 2001-02-16 | シリコン単結晶の製造方法 |
JP2001-39556 | 2001-02-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002064866A1 true WO2002064866A1 (fr) | 2002-08-22 |
Family
ID=18902318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/001388 WO2002064866A1 (fr) | 2001-02-16 | 2002-02-18 | Procede de fabrication d"un monocristal de silicium |
Country Status (5)
Country | Link |
---|---|
US (1) | US20030140843A1 (ja) |
EP (1) | EP1365048B1 (ja) |
JP (1) | JP4150167B2 (ja) |
KR (1) | KR100639177B1 (ja) |
WO (1) | WO2002064866A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7704318B2 (en) * | 2003-02-25 | 2010-04-27 | Sumco Corporation | Silicon wafer, SOI substrate, method for growing silicon single crystal, method for manufacturing silicon wafer, and method for manufacturing SOI substrate |
CN113825862A (zh) * | 2019-04-11 | 2021-12-21 | 环球晶圆股份有限公司 | 后段主体长度具有减小变形的锭的制备工艺 |
JP7124938B1 (ja) * | 2021-07-29 | 2022-08-24 | 信越半導体株式会社 | シリコン単結晶の製造方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000063195A (ja) * | 1998-08-18 | 2000-02-29 | Nec Corp | 半導体結晶育成装置及び育成方法 |
US6066306A (en) * | 1997-11-11 | 2000-05-23 | Shin-Etsu Handotai Co., Ltd. | Silicon single crystal wafer having few crystal defects, and method RFO producing the same |
EP1035234A1 (en) * | 1997-08-26 | 2000-09-13 | Sumitomo Metal Industries Limited | High-quality silicon single crystal and method of producing the same |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5653799A (en) * | 1995-06-02 | 1997-08-05 | Memc Electronic Materials, Inc. | Method for controlling growth of a silicon crystal |
JP3907727B2 (ja) * | 1995-12-26 | 2007-04-18 | 信越半導体株式会社 | 単結晶引き上げ装置 |
JP3747123B2 (ja) * | 1997-11-21 | 2006-02-22 | 信越半導体株式会社 | 結晶欠陥の少ないシリコン単結晶の製造方法及びシリコン単結晶ウエーハ |
JP2959543B2 (ja) * | 1997-12-12 | 1999-10-06 | 日本電気株式会社 | 半導体単結晶育成装置および結晶育成方法 |
JP2885240B1 (ja) * | 1998-03-16 | 1999-04-19 | 日本電気株式会社 | 半導体結晶育成装置および育成方法 |
JP3943717B2 (ja) * | 1998-06-11 | 2007-07-11 | 信越半導体株式会社 | シリコン単結晶ウエーハ及びその製造方法 |
-
2001
- 2001-02-16 JP JP2001039556A patent/JP4150167B2/ja not_active Expired - Fee Related
-
2002
- 2002-02-18 KR KR1020027011975A patent/KR100639177B1/ko not_active IP Right Cessation
- 2002-02-18 EP EP02712433A patent/EP1365048B1/en not_active Expired - Lifetime
- 2002-02-18 US US10/275,718 patent/US20030140843A1/en not_active Abandoned
- 2002-02-18 WO PCT/JP2002/001388 patent/WO2002064866A1/ja not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1035234A1 (en) * | 1997-08-26 | 2000-09-13 | Sumitomo Metal Industries Limited | High-quality silicon single crystal and method of producing the same |
US6066306A (en) * | 1997-11-11 | 2000-05-23 | Shin-Etsu Handotai Co., Ltd. | Silicon single crystal wafer having few crystal defects, and method RFO producing the same |
JP2000063195A (ja) * | 1998-08-18 | 2000-02-29 | Nec Corp | 半導体結晶育成装置及び育成方法 |
Non-Patent Citations (1)
Title |
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See also references of EP1365048A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1365048A1 (en) | 2003-11-26 |
JP2002249397A (ja) | 2002-09-06 |
EP1365048A4 (en) | 2009-01-21 |
EP1365048B1 (en) | 2012-05-09 |
US20030140843A1 (en) | 2003-07-31 |
KR20020081442A (ko) | 2002-10-26 |
JP4150167B2 (ja) | 2008-09-17 |
KR100639177B1 (ko) | 2006-10-27 |
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