US20130344775A1 - Wafer processing method - Google Patents
Wafer processing method Download PDFInfo
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- US20130344775A1 US20130344775A1 US13/945,479 US201313945479A US2013344775A1 US 20130344775 A1 US20130344775 A1 US 20130344775A1 US 201313945479 A US201313945479 A US 201313945479A US 2013344775 A1 US2013344775 A1 US 2013344775A1
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- wafer
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- processing method
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- 238000003672 processing method Methods 0.000 title claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 31
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 31
- 235000012431 wafers Nutrition 0.000 description 71
- 239000010408 film Substances 0.000 description 17
- 239000004065 semiconductor Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/065—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of thin, brittle parts, e.g. semiconductors, wafers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic System
- H01L29/1608—Silicon carbide
Definitions
- the present invention relates to a wafer processing method of processing a wafer having an epitaxial film formed on the front side.
- Epitaxial growth on the front side of a semiconductor crystal substrate (wafer) of silicon (Si) or the like causes undesirable formation of a ridge portion of an epitaxial film, called edge crown, along the peripheral edge of the wafer.
- the peripheral edge of the wafer is generally formed with a chamfered portion to suppress the occurrence of abnormal growth in the epitaxial growth, i.e., the formation of the edge crown and to also prevent the occurrence of cracking or chipping due to the contact of the peripheral edge of the wafer in handling or transporting the wafer.
- Japanese Patent Laid-open No. Hei 7-226349 discloses a technique of forming a tapering chamfered portion along the peripheral edge of the wafer to suppress the height of the edge crown.
- SiC semiconductor that has recently received attention has excellent physical and chemical properties and it is therefore expected that a smaller-size and lower-loss semiconductor device over a silicon (Si) semiconductor can be realized.
- SiC semiconductor is expected to be applied to power-conversion switching devices used in various fields such as electric power, automobile, railroad, and home electrical appliance and also applied to high-performance and large-power radio-frequency devices for communications.
- power-conversion switching devices used in various fields such as electric power, automobile, railroad, and home electrical appliance
- high-performance and large-power radio-frequency devices for communications there is a case that no chamfering is performed on an SiC wafer.
- edge crowns are formed on the front side and back side of the wafer along the peripheral edge thereof, causing the damage to the devices formed on the front side of the wafer or the faulty suction holding of the wafer in the subsequent step.
- a wafer processing method of processing a wafer having an epitaxial film formed on the front side including a holding step of holding the wafer on a holding table having a holding surface for holding the wafer and a rotational axis extending perpendicularly to the holding surface and passing through the center of the holding surface; and a removing step of pressing a grinding member on a ridge portion formed along the peripheral edge of the wafer held on the holding table and rotating the holding table about the rotational axis, thereby removing the ridge portion.
- the wafer is held on the holding table in the condition where the center of the wafer is deviated from the rotational axis of the holding table in the holding step.
- the wafer is formed of silicon carbide.
- the ridge portion (edge crown) formed along the peripheral edge of the wafer having the epitaxial film formed on the front side is removed by grinding. Accordingly, it is possible to prevent the damage to the devices and the faulty suction holding of the wafer in the subsequent step due to the ridge portion of the epitaxial film.
- FIG. 1 is a sectional view of an SiC wafer having an epitaxial film on the front side;
- FIG. 2 is a partially sectional side view showing a holding step
- FIG. 3 is a partially sectional side view showing a removing step
- FIG. 4 is a partially sectional side view showing another preferred embodiment of the removing step.
- FIG. 1 there is shown an SiC (silicon carbide) wafer 11 .
- the SiC wafer 11 is composed of an SiC bulk wafer (SiC substrate) 13 and an epitaxial film 15 formed on the SiC bulk wafer 13 by epitaxial growth. That is, the epitaxial film 15 is formed as a single-crystal SiC thin film.
- the epitaxial film 15 of the SiC wafer 11 is formed by CVD (Chemical Vapor Deposition) or the like.
- the SiC wafer 11 has a front side 11 a (upper surface), a back side 11 b (lower surface), and a peripheral surface 11 e substantially perpendicular to both the front side 11 a and the back side 11 b. That is, the peripheral surface 11 e of the SiC wafer 11 is not formed with a chamfered portion.
- edge crowns (ridge portions) 17 and 19 are formed on the front side 11 a and the back side 11 b near the peripheral surface 11 e.
- the wafer processing method of the present invention is a method of removing the edge crowns 17 and 19 from such a wafer having the edge crowns 17 and 19 .
- a holding step is first performed in such a manner that the SiC wafer 11 is held under suction on a holding table 10 having a holding surface 10 a and a rotational axis 10 b.
- the rotational axis 10 b extends perpendicularly to the holding surface 10 a and passes through the center of the holding surface 10 a.
- the holding surface 10 a is selectively connected to a vacuum source (not shown).
- the SiC wafer 11 is held under suction on the holding surface 10 a of the holding table 10 in the condition where the center 11 c of the SiC wafer 11 does not coincide with the rotational axis 10 b of the holding table 10 , that is, in the condition where the center 11 c of the SiC wafer 11 is deviated from the rotational axis 10 b of the holding table 10 .
- a removing step is performed as shown in FIG. 3 in the following manner. In this removing step, a grinding member 20 of a grinding jig 16 is pressed on the edge crown 17 of the SiC wafer 11 held on the holding table 10 .
- the grinding jig 16 is composed of a base 18 and the grinding member 20 fixed to the lower surface of the base 18 .
- the grinding member 20 is provided by a grinding wheel, for example.
- the grinding member 20 is not limited to a grinding wheel, but abrasive grains dispersed in a nonwoven fabric or polyurethane foam may be used, for example. Further, the term of “grinding” used in this description is regarded as also including polishing.
- the grinding jig 16 is mounted through a coil spring 14 to the front end portion of an L-shaped support member 12 . Accordingly, the grinding member 20 is pressed on the edge crown 17 by the biasing force of the coil spring 14 . In the condition where the grinding member 20 is pressed on the edge crown 17 by the biasing force of the coil spring 14 , the holding table 10 is rotated in the direction shown by an arrow a at 300 rpm, for example, so that the edge crown 17 is ground to be removed by the grinding member 20 .
- the SiC wafer 11 is eccentrically held on the holding table 10 , so that when the holding table 10 is rotated, the edge crown 17 is oscillated in the radial direction of the wafer 11 . Accordingly, the edge crown 17 is ground by the grinding member 20 as moving both in the circumferential direction of the wafer 11 and in the radial direction of the wafer 11 . As a result, the grinding of the edge crown 17 is performed effectively. Further, if the SiC wafer 11 is concentrically held on the holding table 10 , a part of the grinding member 20 always abuts against the edge crown 17 in the grinding operation, causing local wearing of the grinding member 20 . However, since the SiC wafer 11 is eccentrically held on the holding table 10 in this preferred embodiment, such local wearing of the grinding member 20 can be prevented.
- a protective tape (not shown) is attached to the front side 11 a of the wafer 11 .
- the wafer 11 is held under suction through the protective tape on the holding table 10 , and the grinding member 20 is pressed on the edge crown 19 formed on the back side 11 b of the SiC wafer 11 to grind the edge crown 19 , thereby removing the edge crown 19 .
- FIG. 4 there is shown a partially sectional side view illustrating another preferred embodiment of the removing step.
- a support member 22 for supporting the grinding jig 16 is used.
- the support member 22 is composed of a first arm 24 and a second arm 26 pivotably connected through a joint 28 to the front end of the first arm 24 .
- the grinding jig 16 is mounted to the front end of the second arm 26 .
- the grinding surface (lower surface) of the grinding member 20 can be inclined at a predetermined angle with respect to the epitaxial film 15 formed on the front side of the SiC bulk wafer 13 in grinding the edge crown 17 .
- the joint 28 is preferably provided with a spring for biasing the second arm 26 in a counterclockwise direction as viewed in FIG. 4 , thereby pressing the grinding member 20 on the edge crown 17 .
- the wafer processing method of the present invention is applied to the SiC wafer 11 having no chamfered portion along the peripheral edge in each preferred embodiment mentioned above, the workpiece to be processed by the present invention is not limited to the SiC wafer 11 , but the present invention is also applicable to any other wafers having no chamfered portion along the peripheral edge.
Abstract
A wafer processing method of processing a wafer having an epitaxial film formed on the front side. The wafer processing method includes a holding step of holding the wafer on a holding table having a holding surface for holding the wafer and a rotational axis extending perpendicularly to the holding surface and passing through the center of the holding surface, and a removing step of pressing a grinding member on a ridge portion formed along the peripheral edge of the wafer held on the holding table and rotating the holding table about the rotational axis, thereby removing the ridge portion.
Description
- 1. Field of the Invention
- The present invention relates to a wafer processing method of processing a wafer having an epitaxial film formed on the front side.
- 2. Description of the Related Art
- Epitaxial growth on the front side of a semiconductor crystal substrate (wafer) of silicon (Si) or the like causes undesirable formation of a ridge portion of an epitaxial film, called edge crown, along the peripheral edge of the wafer. To cope with this problem, the peripheral edge of the wafer is generally formed with a chamfered portion to suppress the occurrence of abnormal growth in the epitaxial growth, i.e., the formation of the edge crown and to also prevent the occurrence of cracking or chipping due to the contact of the peripheral edge of the wafer in handling or transporting the wafer.
- However, when the epitaxial film has a large thickness, the height of the edge crown is increased to more than 10 μm in some cases. In such a wafer, the formation of the edge crown cannot be suppressed by a conventional arcuate chamfered portion. To cope with this problem, Japanese Patent Laid-open No. Hei 7-226349 discloses a technique of forming a tapering chamfered portion along the peripheral edge of the wafer to suppress the height of the edge crown.
- In the case that such a sufficiently large chamfered portion is formed along the peripheral edge of the wafer as mentioned above, the height of the edge crown formed during the epitaxial growth can be suppressed. However, there is a case that the chamfered portion is small or no chamfering is performed depending on the kind of the wafer. In such a wafer, an edge crown (ridge portion of the epitaxial film) is undesirably formed along the peripheral edge of the wafer during the epitaxial growth. There is a possibility that the edge crown (ridge portion of the epitaxial film) formed on the front side of the wafer along the peripheral edge thereof may be broken during transportation of the wafer to cause damage to the devices formed on the front side of the wafer. Further, when an edge crown is formed on the back side of the wafer, there is a possibility that faulty suction holding of the wafer may occur in holding the back side of the wafer under suction in a subsequent step.
- An SiC semiconductor that has recently received attention has excellent physical and chemical properties and it is therefore expected that a smaller-size and lower-loss semiconductor device over a silicon (Si) semiconductor can be realized. Such an SiC semiconductor is expected to be applied to power-conversion switching devices used in various fields such as electric power, automobile, railroad, and home electrical appliance and also applied to high-performance and large-power radio-frequency devices for communications. However, there is a case that no chamfering is performed on an SiC wafer. When an epitaxial film is formed on the SiC wafer by epitaxial growth, edge crowns are formed on the front side and back side of the wafer along the peripheral edge thereof, causing the damage to the devices formed on the front side of the wafer or the faulty suction holding of the wafer in the subsequent step.
- It is therefore an object of the present invention to provide a wafer processing method which can prevent the damage to the devices and the faulty suction holding of the wafer in the subsequent step due to the ridge portion of the epitaxial film, regardless of the kind of the wafer.
- In accordance with an aspect of the present invention, there is provided a wafer processing method of processing a wafer having an epitaxial film formed on the front side, the wafer processing method including a holding step of holding the wafer on a holding table having a holding surface for holding the wafer and a rotational axis extending perpendicularly to the holding surface and passing through the center of the holding surface; and a removing step of pressing a grinding member on a ridge portion formed along the peripheral edge of the wafer held on the holding table and rotating the holding table about the rotational axis, thereby removing the ridge portion.
- Preferably, the wafer is held on the holding table in the condition where the center of the wafer is deviated from the rotational axis of the holding table in the holding step. Preferably, the wafer is formed of silicon carbide.
- According to the present invention, the ridge portion (edge crown) formed along the peripheral edge of the wafer having the epitaxial film formed on the front side is removed by grinding. Accordingly, it is possible to prevent the damage to the devices and the faulty suction holding of the wafer in the subsequent step due to the ridge portion of the epitaxial film.
- The above and other objects, features and advantages of the present invention and the manner of realizing them will become more apparent, and the invention itself will best be understood from a study of the following description and appended claims with reference to the attached drawings showing some preferred embodiments of the invention.
-
FIG. 1 is a sectional view of an SiC wafer having an epitaxial film on the front side; -
FIG. 2 is a partially sectional side view showing a holding step; -
FIG. 3 is a partially sectional side view showing a removing step; and -
FIG. 4 is a partially sectional side view showing another preferred embodiment of the removing step. - A preferred embodiment of the present invention will now be described in detail with reference to the drawings. Referring to
FIG. 1 , there is shown an SiC (silicon carbide)wafer 11. TheSiC wafer 11 is composed of an SiC bulk wafer (SiC substrate) 13 and anepitaxial film 15 formed on theSiC bulk wafer 13 by epitaxial growth. That is, theepitaxial film 15 is formed as a single-crystal SiC thin film. Usually, theepitaxial film 15 of theSiC wafer 11 is formed by CVD (Chemical Vapor Deposition) or the like. The SiCwafer 11 has afront side 11 a (upper surface), aback side 11 b (lower surface), and aperipheral surface 11 e substantially perpendicular to both thefront side 11 a and theback side 11 b. That is, theperipheral surface 11 e of theSiC wafer 11 is not formed with a chamfered portion. - In the case that the
epitaxial film 15 is formed by epitaxial growth on such a wafer having no chamfered portion, e.g., the SiC wafer 11 as mentioned above, edge crowns (ridge portions) 17 and 19 are formed on thefront side 11 a and theback side 11 b near theperipheral surface 11 e. The wafer processing method of the present invention is a method of removing theedge crowns edge crowns FIG. 2 , a holding step is first performed in such a manner that theSiC wafer 11 is held under suction on a holding table 10 having aholding surface 10 a and arotational axis 10 b. Therotational axis 10 b extends perpendicularly to theholding surface 10 a and passes through the center of theholding surface 10 a. Although not especially shown, theholding surface 10 a is selectively connected to a vacuum source (not shown). - In this holding step, the
SiC wafer 11 is held under suction on theholding surface 10 a of the holding table 10 in the condition where thecenter 11 c of theSiC wafer 11 does not coincide with therotational axis 10 b of the holding table 10, that is, in the condition where thecenter 11 c of theSiC wafer 11 is deviated from therotational axis 10 b of the holding table 10. Thereafter, a removing step is performed as shown inFIG. 3 in the following manner. In this removing step, a grindingmember 20 of agrinding jig 16 is pressed on theedge crown 17 of the SiCwafer 11 held on the holding table 10. Thegrinding jig 16 is composed of abase 18 and thegrinding member 20 fixed to the lower surface of thebase 18. The grindingmember 20 is provided by a grinding wheel, for example. However, thegrinding member 20 is not limited to a grinding wheel, but abrasive grains dispersed in a nonwoven fabric or polyurethane foam may be used, for example. Further, the term of “grinding” used in this description is regarded as also including polishing. - The
grinding jig 16 is mounted through acoil spring 14 to the front end portion of an L-shaped support member 12. Accordingly, thegrinding member 20 is pressed on theedge crown 17 by the biasing force of thecoil spring 14. In the condition where thegrinding member 20 is pressed on theedge crown 17 by the biasing force of thecoil spring 14, the holding table 10 is rotated in the direction shown by an arrow a at 300 rpm, for example, so that theedge crown 17 is ground to be removed by thegrinding member 20. - The SiC
wafer 11 is eccentrically held on the holding table 10, so that when the holding table 10 is rotated, theedge crown 17 is oscillated in the radial direction of thewafer 11. Accordingly, theedge crown 17 is ground by thegrinding member 20 as moving both in the circumferential direction of thewafer 11 and in the radial direction of thewafer 11. As a result, the grinding of theedge crown 17 is performed effectively. Further, if the SiCwafer 11 is concentrically held on the holding table 10, a part of the grindingmember 20 always abuts against theedge crown 17 in the grinding operation, causing local wearing of thegrinding member 20. However, since the SiCwafer 11 is eccentrically held on the holding table 10 in this preferred embodiment, such local wearing of the grindingmember 20 can be prevented. - After removing the
edge crown 17 formed on thefront side 11 a of theSiC wafer 11, a protective tape (not shown) is attached to thefront side 11 a of thewafer 11. In this condition, thewafer 11 is held under suction through the protective tape on the holding table 10, and thegrinding member 20 is pressed on theedge crown 19 formed on theback side 11 b of theSiC wafer 11 to grind theedge crown 19, thereby removing theedge crown 19. - Referring next to
FIG. 4 , there is shown a partially sectional side view illustrating another preferred embodiment of the removing step. In this preferred embodiment, asupport member 22 for supporting the grindingjig 16 is used. Thesupport member 22 is composed of afirst arm 24 and asecond arm 26 pivotably connected through a joint 28 to the front end of thefirst arm 24. The grindingjig 16 is mounted to the front end of thesecond arm 26. With this configuration, the grinding surface (lower surface) of the grindingmember 20 can be inclined at a predetermined angle with respect to theepitaxial film 15 formed on the front side of theSiC bulk wafer 13 in grinding theedge crown 17. Accordingly, it is possible to prevent a problem such that theepitaxial film 15 formed on the front side of thebulk wafer 13 may be damaged by the grindingmember 20 in grinding theedge crown 17. In this preferred embodiment, the joint 28 is preferably provided with a spring for biasing thesecond arm 26 in a counterclockwise direction as viewed inFIG. 4 , thereby pressing the grindingmember 20 on theedge crown 17. - While the wafer processing method of the present invention is applied to the
SiC wafer 11 having no chamfered portion along the peripheral edge in each preferred embodiment mentioned above, the workpiece to be processed by the present invention is not limited to theSiC wafer 11, but the present invention is also applicable to any other wafers having no chamfered portion along the peripheral edge. - The present invention is not limited to the details of the above described preferred embodiments. The scope of the invention is defined by the appended claims and all changes and modifications as fall within the equivalence of the scope of the claims are therefore to be embraced by the invention.
Claims (3)
1. A wafer processing method of processing a wafer having an epitaxial film formed on a front side, said wafer processing method comprising:
a holding step of holding said wafer on a holding table having a holding surface for holding said wafer and a rotational axis extending perpendicularly to said holding surface and passing through the center of said holding surface; and
a removing step of pressing a grinding member on a ridge portion formed along the peripheral edge of said wafer held on said holding table and rotating said holding table about said rotational axis, thereby removing said ridge portion.
2. The wafer processing method according to claim 1 , wherein said wafer is held on said holding table in the condition where the center of said wafer is deviated from said rotational axis of said holding table in said holding step.
3. The wafer processing method according to claim 1 , wherein said wafer is formed of silicon carbide.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012-163764 | 2012-06-24 | ||
JP2012163764A JP2014027006A (en) | 2012-07-24 | 2012-07-24 | Processing method of wafer |
Publications (1)
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US20130344775A1 true US20130344775A1 (en) | 2013-12-26 |
Family
ID=49774814
Family Applications (1)
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US13/945,479 Abandoned US20130344775A1 (en) | 2012-06-24 | 2013-07-18 | Wafer processing method |
Country Status (2)
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US (1) | US20130344775A1 (en) |
JP (1) | JP2014027006A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US20160086798A1 (en) * | 2013-05-29 | 2016-03-24 | Sumitomo Electric Industries, Ltd. | Silicon carbide substrate, silicon carbide semiconductor device, and methods for manufacturing silicon carbide substrate and silicon carbide semiconductor device |
CN108972209A (en) * | 2018-07-23 | 2018-12-11 | 江西省子轩科技有限公司 | A kind of processing mechanism based on the removal angle fender R hangnail |
CN112775757A (en) * | 2021-01-05 | 2021-05-11 | 长江存储科技有限责任公司 | Semiconductor machine and grinding method |
CN113182971A (en) * | 2021-05-12 | 2021-07-30 | 四川雅吉芯电子科技有限公司 | High-precision edge grinding device for monocrystalline silicon epitaxial wafer |
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CN107004583B (en) | 2014-12-02 | 2020-06-26 | 昭和电工株式会社 | Wafer support table, chemical vapor deposition apparatus, epitaxial wafer and method for manufacturing the same |
JP6947135B2 (en) * | 2018-04-25 | 2021-10-13 | 信越半導体株式会社 | Polishing equipment, wafer polishing method, and wafer manufacturing method |
WO2019208042A1 (en) * | 2018-04-25 | 2019-10-31 | 信越半導体株式会社 | Polishing device, wafer polishing method, and wafer manufacturing method |
JP7151688B2 (en) * | 2019-11-01 | 2022-10-12 | 三菱電機株式会社 | Silicon carbide epitaxial substrate manufacturing method and semiconductor device manufacturing method |
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