WO2015151412A1 - SiC種結晶の加工変質層の除去方法、SiC種結晶及びSiC基板の製造方法 - Google Patents
SiC種結晶の加工変質層の除去方法、SiC種結晶及びSiC基板の製造方法 Download PDFInfo
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- 239000013078 crystal Substances 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 61
- 239000000758 substrate Substances 0.000 title claims description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 10
- 239000002904 solvent Substances 0.000 claims abstract description 6
- 238000000407 epitaxy Methods 0.000 claims abstract description 5
- 238000005530 etching Methods 0.000 claims description 46
- 238000010438 heat treatment Methods 0.000 claims description 30
- 229910052799 carbon Inorganic materials 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 5
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- 238000010586 diagram Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
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- 230000000694 effects Effects 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009036 growth inhibition Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000004943 liquid phase epitaxy Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 238000007666 vacuum forming Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
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- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910003468 tantalcarbide Inorganic materials 0.000 description 1
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- 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
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
- C30B33/08—Etching
- C30B33/12—Etching in gas atmosphere or plasma
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- 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
- C30B19/00—Liquid-phase epitaxial-layer growth
- C30B19/02—Liquid-phase epitaxial-layer growth using molten solvents, e.g. flux
- C30B19/04—Liquid-phase epitaxial-layer growth using molten solvents, e.g. flux the solvent being a component of the crystal composition
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- 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
- C30B19/00—Liquid-phase epitaxial-layer growth
- C30B19/12—Liquid-phase epitaxial-layer growth characterised by the substrate
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- 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
- C30B29/10—Inorganic compounds or compositions
- C30B29/36—Carbides
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- 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
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
- C30B33/02—Heat treatment
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
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Definitions
- the present invention mainly relates to a method for removing a work-affected layer of a SiC seed crystal produced by cutting.
- SiC is attracting attention as a new semiconductor material because it is superior in heat resistance and electrical characteristics as compared to Si and the like.
- an SiC substrate SiC bulk substrate
- an epitaxial layer is grown on the SiC substrate to produce an epitaxial wafer.
- a semiconductor element is manufactured from this epitaxial wafer.
- an MSE method is known as a method for growing a SiC single crystal using a seed crystal.
- Patent Document 1 discloses a method of growing a SiC single crystal using the MSE method.
- the MSE method uses a SiC seed crystal composed of a SiC single crystal, a feed substrate having a higher free energy than the SiC seed crystal, and a Si melt.
- An SiC single crystal can be grown on the surface of the SiC seed crystal by disposing the SiC seed crystal and the feed substrate so as to face each other, positioning the Si melt therebetween, and heating under vacuum.
- Non-Patent Document 1 discloses that the growth of an SiC single crystal by the MSE method is inhibited by crystal defects.
- the screw dislocation (TSD) has the largest growth inhibition degree
- the basal plane dislocation (BPD) has the small growth inhibition degree
- the edge dislocation (TED) hardly inhibits the growth.
- Patent Document 2 discloses a processing method for removing a surface alteration layer generated on a SiC substrate.
- the surface-affected layer is described as a damaged layer having a crystal structure generated in a step of producing a SiC substrate (mechanical processing such as mechanical polishing).
- Patent Document 2 describes hydrogen etching as a method for removing the surface-modified layer.
- the applicant of the present application has found that when the MSE method is performed using an SiC single crystal cut by a diamond saw or the like as the SiC seed crystal, the growth rate is extremely slow.
- the MSE method is expected because it can produce a SiC substrate having higher quality than the sublimation recrystallization method, and it is required to eliminate this point.
- Patent Document 2 only discloses that there is a work-affected layer on the SiC substrate grown from the SiC seed crystal and that it is removed, and does not mention the work-affected layer of the SiC seed crystal.
- the present invention has been made in view of the above circumstances, and its main object is to provide a method in which the growth rate does not decrease even when the MSE method is performed using a cut SiC seed crystal. It is in.
- a method for removing a work-affected layer generated by cutting a SiC single crystal used as a seed crystal in a metastable solvent epitaxy method the surface of the SiC seed crystal being
- a method for removing a work-affected layer of a SiC seed crystal comprising an etching step of etching by heating in a Si atmosphere.
- the SiC seed crystal is plate-shaped, and in the etching step, at least a plane parallel to the thickness direction of the SiC seed crystal is etched.
- the etching amount in the etching step is preferably 10 ⁇ m or more.
- a SiC seed crystal from which the work-affected layer has been removed by the process of removing the work-affected layer of the SiC seed crystal.
- a method for manufacturing a SiC substrate including the step of removing the work-affected layer of the SiC seed crystal and a growth step.
- a SiC single crystal is grown by a metastable solvent epitaxy method using the SiC seed crystal from which the work-affected layer has been removed in the removal step.
- the SiC substrate can be efficiently manufactured.
- the schematic diagram which shows the structural example when growing a SiC single crystal by MSE method.
- the perspective view and sectional drawing which show a mode when etching a SiC seed crystal.
- the graph which shows the etching time and etching amount of a SiC seed crystal.
- FIG. 1 is a diagram for explaining the outline of a high-temperature vacuum furnace used in the surface treatment method of the present invention.
- the high-temperature vacuum furnace 10 includes a main heating chamber 21 and a preheating chamber 22.
- the main heating chamber 21 can heat an object whose surface is composed of at least a SiC single crystal to a temperature of 1000 ° C. or higher and 2300 ° C. or lower.
- the preheating chamber 22 is a space for performing preheating before the object to be processed is heated in the main heating chamber 21.
- a vacuum forming valve 23 and a vacuum gauge 25 are connected to the main heating chamber 21.
- the degree of vacuum in the main heating chamber 21 can be adjusted by the vacuum forming valve 23.
- With the vacuum gauge 25, the degree of vacuum in the main heating chamber 21 can be measured.
- a heater 26 is provided inside the heating chamber 21. Further, a heat reflecting metal plate (not shown) is fixed to the side wall and ceiling of the main heating chamber 21, and the heat reflecting metal plate reflects the heat of the heater 26 toward the central portion of the main heating chamber 21. It is configured. Thereby, a to-be-processed object can be heated powerfully and uniformly, and it can be heated up to the temperature of 1000 to 2300 degreeC.
- a resistance heating type heater or a high frequency induction heating type heater can be used as the heater 26, for example.
- the object to be processed is heated while being accommodated in the crucible (accommodating container) 30.
- the crucible 30 is placed on an appropriate support base or the like, and is configured to be movable at least from the preheating chamber to the main heating chamber by moving the support base.
- the crucible 30 includes an upper container 31 and a lower container 32 that can be fitted to each other.
- the crucible 30 is made of tantalum metal and is configured to expose the tantalum carbide layer to the internal space.
- Si serving as a Si supply source is arranged in an appropriate form.
- the crucible 30 When heat-treating the workpiece, first, as shown by a chain line in FIG. 1, the crucible 30 is placed in the preheating chamber 22 of the high-temperature vacuum furnace 10 and preliminarily maintained at an appropriate temperature (for example, about 800 ° C.). Heat. Next, the crucible 30 is moved to the main heating chamber 21 that has been heated to a preset temperature (for example, about 1800 ° C.) in advance, and the object to be processed is heated. Note that preheating may be omitted.
- a preset temperature for example, about 1800 ° C.
- FIG. 2 is a schematic diagram showing a configuration example when a SiC single crystal is grown by the MSE method.
- an SiC seed crystal 40, two Si plates 41, and two carbon feed substrates 42 are arranged inside the crucible 30. These are supported by a support base 33.
- the SiC seed crystal 40 is used as a substrate (seed side) for liquid phase epitaxial growth.
- the SiC seed crystal 40 is produced, for example, by dicing (cutting) a 4H—SiC single crystal having a predetermined size.
- the SiC seed crystal 40 of this embodiment is a hexagonal plate-shaped member as shown in FIG. 3, the shape is arbitrary. Further, 6H—SiC can be used instead of 4H—SiC.
- Si plates 41 are arranged above and below the SiC seed crystal 40.
- the Si plate 41 is a Si plate-like member. Since the melting point of Si is about 1400 ° C., the Si plate 41 is melted by heating in the high-temperature vacuum furnace 10 described above. Carbon feed substrates 42 are arranged above and below the Si plate 41.
- the carbon feed substrate 42 is used as a raw material for supplying carbon, that is, a feed side.
- the carbon feed substrate 42 is made of polycrystalline 3C—SiC and has a higher free energy than the SiC seed crystal 40.
- the SiC seed crystal 40, the Si plate 41, and the carbon feed substrate 42 are disposed as described above and heated at, for example, 1800 ° C., the Si plate 41 disposed between the SiC seed crystal 40 and the carbon feed substrate 42 is melted.
- the silicon melt acts as a solvent for moving carbon.
- a SiC single crystal can be grown on the surface of the SiC seed crystal 40 by the MSE method. Thereby, it is possible to manufacture a SiC substrate flat at an atomic level with few micropipes and crystal defects.
- an epitaxial layer is grown by CVD (chemical vapor deposition) or LPE (liquid phase epitaxy), an ion implantation process, an annealing process (heating process) for activating ions. Etc. are performed, and a semiconductor element is manufactured.
- the present applicant has discovered that even if the MSE method is performed using the SiC seed crystal 40, the growth rate of the SiC single crystal may be extremely slow. Furthermore, the present applicant has also discovered that this phenomenon occurs when the SiC seed crystal 40 produced by cutting such as dicing is used. Based on these findings, the applicant of the present application considers that a stress is applied to the SiC seed crystal 40 during the cutting process to generate a work-affected layer, and this work-affected layer inhibits growth, and the work-affected layer is removed. A method was proposed.
- FIG. 3 is a perspective view and a cross-sectional view showing a state when the SiC seed crystal 40 is etched.
- the etching of the SiC seed crystal 40 is performed by accommodating the SiC seed crystal 40 in the crucible 30 and heating the crucible 30 in the high temperature vacuum furnace 10. As shown in FIG. 3, the SiC seed crystal 40 is disposed inside the crucible 30 described above. In this embodiment, the SiC seed crystal 40 is supported by the support base 34, but the support base 34 may be omitted. However, it is considered that the work-affected layer of SiC seed crystal 40 is formed on the side surface (surface parallel to the thickness direction) and its vicinity, so it is preferable to expose this portion.
- a Si supply source is arranged in the crucible 30 in order to place the crucible 30 in a Si atmosphere during heating.
- the Si supply source include solid Si pellets, Si fixed to the inner wall of the crucible 30, or an inner wall made of tantalum silicide. This etching is performed by heating the crucible 30 (SiC seed crystal 40) in an environment of 1500 ° C. to 2200 ° C., preferably 1800 ° C. to 2000 ° C. By heating, the inside of the crucible 30 becomes a Si atmosphere by the Si supply source.
- SiC seed crystal 40 When SiC seed crystal 40 is heated under Si vapor pressure, SiC in SiC seed crystal 40 becomes Si 2 C or SiC 2 and sublimates, and Si in the Si atmosphere becomes C and C on the surface of SiC seed crystal 40. Combine and self-organize. Thereby, the work-affected layer considered to be generated on the side surface of SiC seed crystal 40 and in the vicinity thereof can be removed. Thereby, even if it is the SiC seed crystal 40 produced by cutting processes, such as a dicing process, it can prevent that a growth rate falls at the time of implementation of MSE method.
- FIGS. 4 and 5 are diagrams showing results when the SiC seed crystal 40 is etched.
- four SiC seed crystals 40 having the same configuration were prepared, and three of the SiC seed crystals 40 were subjected to heat treatment at 1800 ° C. and 10 ⁇ 5 Pa for 3 minutes, 7 minutes, and 11 minutes, respectively. .
- the SiC seed crystal 40 having a heating time of 3 minutes has an etching amount of 11 ⁇ m
- the SiC seed crystal 40 having a heating time of 7 minutes has an etching amount of 25 ⁇ m.
- the etching amount of the SiC seed crystal 40 having a time of 11 minutes was 32 ⁇ m. Note that the etching amount increased as the etching time was increased, and the etching time and the etching amount were in a proportional relationship.
- the SiC seed crystal 40 can be etched by a desired amount by measuring the etching time.
- FIG. 5 is a view showing a micrograph when the etched SiC seed crystal 40 is viewed from above (from one side in the thickness direction).
- the measurement point 1 is a hexagonal side portion
- the measurement point 2 is a hexagonal apex portion.
- the number at the top of FIG. 5B is the etching amount.
- a part of the end portion of the SiC seed crystal 40 is missing and uneven.
- the SiC seed crystal 40 having a larger etching amount the chipping at the end portion is removed, and a considerable improvement is observed when the etching amount is 10 ⁇ m.
- the etching amount is 25 ⁇ m and 32 ⁇ m, the chipping at the end portion is almost completely completed. It can be seen that the end face is flattened.
- the Si plate 41 and the carbon feed substrate 42 were disposed as described with reference to FIG. 2, and heating was performed at 1800 ° C. with an inert gas pressure of 10 torr for a predetermined time. Thereafter, the SiC seed crystal 40 was taken out, and the length in the a-axis direction (epitaxial growth direction) was measured.
- the SiC seed crystal 40 having an etching amount of 10 ⁇ m clearly has a higher growth rate than the SiC seed crystal 40 that has not been etched. Further, the SiC seed crystal 40 having an etching amount of 25 ⁇ m has a higher growth rate. Note that the growth rates of the SiC seed crystals 40 having an etching amount of 25 ⁇ m and 32 ⁇ m were almost the same.
- the etching amount is preferably 10 ⁇ m or more, and more preferably 25 ⁇ m or more. As described above, by etching the SiC seed crystal 40, a situation in which the growth rate of the MSE method is slow can be avoided.
- a method for removing the work-affected layer of the SiC substrate is generally chemical mechanical polishing or hydrogen etching.
- chemical mechanical polishing it is easy to polish the upper surface or the lower surface of the SiC seed crystal 40, but it is difficult to polish the side surface of the SiC seed crystal 40.
- the polishing rate of chemical mechanical polishing is 1 ⁇ m / h or less.
- the etching rate of hydrogen etching is several tens nm to several hundreds nm / h. Therefore, it takes a long time to remove a general work-affected layer.
- the altered layer can be removed.
- the SiC seed crystal 40 manufactured by dicing and used as a seed crystal for the MSE method is heated in an Si atmosphere to etch the surface, and the SiC seed crystal 40 The process-affected layer generated in the step is removed.
- the SiC seed crystal 40 is plate-shaped, and at least a surface parallel to the thickness direction of the SiC seed crystal 40 is etched.
- etching amount not only etching time but also temperature, inert gas pressure, Si pressure, etc. may be used.
- the temperature conditions and pressure conditions described above are examples and can be changed as appropriate. Further, a heating device other than the high-temperature vacuum furnace 10 described above may be used, or a container having a shape or material different from that of the crucible 30 may be used.
- the cutting process may be a cutting process by an appropriate method such as a mechanical process such as a dicing process or a process using an energy wave such as a laser process.
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Abstract
Description
30 坩堝
40 SiC種結晶
41 Siプレート
42 炭素フィード基板
Claims (5)
- 準安定溶媒エピタキシー法の種結晶として用いられるSiC単結晶について、切断加工により生じた加工変質層を除去するための方法であって、
SiC種結晶の表面をSi雰囲気下で加熱することでエッチングするエッチング工程を含むことを特徴とするSiC種結晶の加工変質層の除去方法。 - 請求項1に記載のSiC種結晶の加工変質層の除去方法であって、
前記SiC種結晶は板状であり、
前記エッチング工程では、少なくとも前記SiC種結晶の厚み方向に平行な面がエッチングされることを特徴とするSiC種結晶の加工変質層の除去方法。 - 請求項1に記載のSiC種結晶の加工変質層の除去方法であって、
前記エッチング工程のエッチング量が10μm以上であることを特徴とするSiC種結晶の加工変質層の除去方法。 - 請求項1に記載のSiC種結晶の加工変質層の除去方法により加工変質層が除去されたSiC種結晶。
- 請求項1に記載のSiC種結晶の加工変質層の除去方法で前記SiC種結晶の加工変質層を除去する除去工程と、
前記除去工程で前記加工変質層が除去された前記SiC種結晶を用いて、準安定溶媒エピタキシー法によりSiC単結晶を成長させる成長工程と、
を含むことを特徴とするSiC基板の製造方法。
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CN201580009773.9A CN106029960B (zh) | 2014-03-31 | 2015-03-10 | SiC籽晶的加工变质层的除去方法、SiC籽晶和SiC基板的制造方法 |
US15/300,597 US20170114475A1 (en) | 2014-03-31 | 2015-03-10 | METHOD FOR REMOVING WORK-AFFECTED LAYER ON SiC SEED CRYSTAL, SiC SEED CRYSTAL, AND SiC SUBSTRATE MANUFACTURING METHOD |
EP15773120.9A EP3128047B1 (en) | 2014-03-31 | 2015-03-10 | Method for removing work-affected layer of sic seed crystal, and sic substrate manufacturing method |
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US10388536B2 (en) * | 2014-11-18 | 2019-08-20 | Toyo Tanso Co., Ltd. | Etching method for SiC substrate and holding container |
JP6621304B2 (ja) * | 2015-11-10 | 2019-12-18 | 学校法人関西学院 | 半導体ウエハの製造方法 |
US11261539B2 (en) | 2017-03-22 | 2022-03-01 | Toyo Tanso Co., Ltd. | Method for manufacturing reformed sic wafer, epitaxial layer-attached sic wafer, method for manufacturing same, and surface treatment method |
JP2018199591A (ja) * | 2017-05-25 | 2018-12-20 | 東洋炭素株式会社 | SiCウエハの製造方法、エピタキシャルウエハの製造方法、及びエピタキシャルウエハ |
WO2020022391A1 (ja) * | 2018-07-25 | 2020-01-30 | 株式会社デンソー | SiCウェハ及びSiCウェハの製造方法 |
JP7300248B2 (ja) * | 2018-07-25 | 2023-06-29 | 株式会社デンソー | SiCウェハ及びSiCウェハの製造方法 |
CN112930422A (zh) * | 2018-09-21 | 2021-06-08 | 东洋炭素株式会社 | 器件制作用晶圆的制造方法 |
CN114174566A (zh) * | 2019-03-05 | 2022-03-11 | 学校法人关西学院 | SiC衬底的制造方法及其制造装置和减少SiC衬底的加工变质层的方法 |
US11932967B2 (en) | 2019-09-27 | 2024-03-19 | Kwansei Gakuin Educational Foundation | SiC single crystal manufacturing method, SiC single crystal manufacturing device, and SiC single crystal wafer |
US20220344152A1 (en) * | 2019-09-27 | 2022-10-27 | Kwansei Gakuin Educational Foundation | Method for manufacturing sic substrate |
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