WO2009119896A1 - AlNバルク単結晶及び半導体デバイス並びにAlN単結晶バルクの製造方法 - Google Patents
AlNバルク単結晶及び半導体デバイス並びにAlN単結晶バルクの製造方法 Download PDFInfo
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- WO2009119896A1 WO2009119896A1 PCT/JP2009/056841 JP2009056841W WO2009119896A1 WO 2009119896 A1 WO2009119896 A1 WO 2009119896A1 JP 2009056841 W JP2009056841 W JP 2009056841W WO 2009119896 A1 WO2009119896 A1 WO 2009119896A1
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- single crystal
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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
- 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
- C30B29/40—AIIIBV compounds wherein A is B, Al, Ga, In or Tl and B is N, P, As, Sb or Bi
- C30B29/403—AIII-nitrides
-
- 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
- C30B23/00—Single-crystal growth by condensing evaporated or sublimed materials
- C30B23/02—Epitaxial-layer growth
- C30B23/025—Epitaxial-layer growth characterised by the substrate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- the present invention relates to a semiconductor device such as a light-emitting element, an electronic element, or a semiconductor sensor, and also to a method for manufacturing an A1N single crystal, and particularly to a method for manufacturing a large-diameter A1N single crystal bulk by a sublimation method.
- A1N crystals have attracted attention as substrate materials for semiconductor devices such as various optical devices and electronic devices because of their wide energy band gap, high thermal conductivity, and high electrical resistance. .
- Patent Document 1 As a conventional method for producing an A1N single crystal, as disclosed in Patent Document 1, for example, there is a sublimation method in which an A1N crystal material is placed in a crucible and the sublimated A1N is grown as a single crystal.
- a single crystal material substance powder and an oxide powder that reacts with the material substance under heating to decompose and vaporize A1N are mixed, and the obtained mixed powder is mixed in a nitrogen atmosphere or hydrogen.
- a nitrogen atmosphere containing carbon or carbon by heating at a temperature lower than the sublimation temperature or melting temperature of the material, the mixed powder is decomposed and vaporized to A1N, and this decomposed and vaporized component is crystal-grown on the substrate. is there.
- the conventional A1N single crystal manufacturing method using the sublimation method requires the preparation of a seed crystal composed of an A1N single crystal having a size close to the diameter of the target single crystal.
- Such an A1N single crystal is expensive. Therefore, there is a problem that it is extremely difficult to obtain A1N single crystal butter of large size (diameter 10mm or more) at present.
- As a method for solving the above problem there is a method of growing an A1N single crystal on a single crystal made of a different material. For example, as disclosed in Non-Patent Documents 1 and 2, an SiC crystal is used as an alternative seed crystal, and an A1N single crystal is grown on the SiC seed crystal by a sublimation method. According to this method, an A1N single crystal as a seed crystal is not required, and an A1N single crystal can be grown.
- Non-Patent Document 3 in a method for growing a SiC single crystal, a surface having an arbitrary inclination other than 90 ° with respect to the C plane of the seed crystal (SiC single crystal) (In the following, a technology that uses the “r-plane” as the crystal growth surface has been reported. According to this technology, it is possible to grow a SiC single crystal in an orientation other than the C axis, so that defects propagating along the C axis are ejected out of the crystal as the crystal grows, and a SiC single crystal with few defects is obtained. It becomes possible.
- Patent Document 1 Japanese Patent Laid-Open No. 10-0 5 3 4 9 5
- Non-Patent Document 1 V. Noveski, "MRS Internet J. Nitride Semicond. Res.”, Vol. 9, 2, 2004
- Non-Patent Document 2 S. Wang, “Mater. Res. Soc. Symp. Proc. J, Vol. 892, FF30-06, 1, 2006
- Non-Patent Document 3 Z.G.Herro, B.M.Epelbaum, M. Bickermann, C. Seitz, A. Magerl,
- the present inventors simply applied A1N on the specific r-plane of the SiC single crystal as the seed crystal.
- the present inventor used a hexagonal single crystal such as SiC as a seed crystal, and a plane inclined by 10 to 80 ° with respect to the C plane of the seed crystal.
- A1N single crystal is grown and seeded by growing A1N single crystal in an orientation other than the C plane.
- the lattice constant between the SiC single crystal and the A1N single crystal (C axis: + 1.1%, A axis: 1.0%) It was also found that the generation of new defects due to poor matching at the seed crystal and A1N single crystal interface can be effectively suppressed.
- the gist of the present invention is as follows.
- a hexagonal single crystal material whose surface is a crystal plane inclined at an angle of 10 to 80 ° with respect to the C plane is used as a seed crystal, and an A1N single crystal is grown on the surface by a sublimation method.
- the obtained A1N single crystal parc is used as a new seed crystal, and an A1N single crystal is grown on the surface of the seed crystal by a sublimation method to obtain an A1N single crystal bulk.
- FIG. 1 is a flow diagram showing a method for producing an A1N single crystal parc according to the present invention.
- FIG. 2 is a perspective view for explaining a habit plane of a hexagonal single crystal used as a seed crystal.
- FIG. 3 is a cross-sectional view of a single crystal growth furnace used for manufacturing the A1N single crystal barrier of the present invention. Explanation of symbols
- FIG. 1 is a flowchart schematically showing a process for producing an A1N single crystal pulc by the production method of the present invention.
- a hexagonal single crystal material is used as seed crystal 1, and a crystal plane inclined at an angle of 10 to 80 ° with respect to the C plane of the hexagonal single crystal material is selected as surface 1a.
- Fig. 1 (a) a crystal plane inclined at an angle of 10 to 80 ° with respect to the C plane of the hexagonal single crystal material is selected as surface 1a.
- Fig. L (b) a sublimation method
- Fig. L (c) a high quality A1N single crystal Balta 4 with few defects
- the surface of seed crystal 1 (FIG. 1 (a)) inclined at 10 to 80 ° with respect to the C plane needs to be the surface 1 a.
- FIG. 2 is a diagram for explaining the crystal habit plane of the seed crystal 1.
- the A1N single crystal 2 is grown using a hexagonal SiC single crystal as the seed crystal 1
- the surface X is inclined by 10 to 80 ° (angle ⁇ in Fig. 2) with respect to the C plane, the surface 1 a is used, and defects generated in the seed crystal 1 (SiC) propagate into the A1N single crystal. Even As the AIN single crystal grows, it disappears. Finally, it becomes possible to obtain a bulk A1N single crystal with reduced defects and reduced defect propagation.
- the surface X is the surface la, matching at the interface 1a between the seed crystal 1 (SiC) and the AIN single crystal is good, and the generation of new defects can be reduced.
- the angle ⁇ is in the range of 10 to 80 ° with respect to the C plane.
- the reason is that if the inclination angle of the crystal plane to be the seed surface 1a with respect to the C plane is smaller than 10 °, defects propagate. This is because the possibility of easy C-plane growth increases, and if it is larger than 80 °, the growth rate is extremely slow, which increases the possibility of a-plane or m-plane growth, which is not preferable.
- the surface X of the seed crystal 1 inclined by 10 to 80 ° with respect to the C plane is not particularly limited as long as the surface satisfies the condition of the inclination angle.
- (0 1 _ ln) plane (n is 1 to: 1 5), (1-1 0 n) plane (n is:! To 1 5) or (1 1 1 2 n) Surface (n:! ⁇ 15).
- the inclination with respect to C-plane is roughly 80 °, 70 °, 62 °, 54 °, 48 °, respectively. ⁇ It changes with 20 °.
- the seed crystal 1 is not particularly limited as long as it is a hexagonal single crystal, but it is preferable to use a single crystal of A1N, SiC, GaN or ZnO.
- a single crystal other than the above is used as a seed crystal, the matching with the A1N single crystal is poor, and the seed crystal and A1
- the A1N single crystal 2 is grown with the (0 1-15) plane as the surface 1 a.
- the (0 1–1 5) plane is neither parallel nor perpendicular to the C plane where defects are likely to propagate, and is a stable plane that also appears on the free-standing SiC single crystal.
- the A1N single crystal 2 is grown on a crystal plane other than the (0 1–1 5) plane, the generation of defects cannot be sufficiently suppressed, and new defects may be generated due to the deterioration of matching. There is. Note that the (0 1-15) plane of the SiC single crystal is inclined by approximately 48 ° with respect to the C plane.
- the growth plane of the obtained A1N single crystal pulc Is a (1 0-1 2) plane in which the inclination between the crystal growth plane 2 of the SiC single crystal and the C plane in crystallography is close to within 10 °.
- This (1 0- 1 2) plane is a crystal growth surface that occurs naturally in A1N single crystals. If this plane is used as the crystal growth plane, an A1 N single crystal with a flat growth plane with few defects can be obtained. It can be easily obtained, and a high-quality A1N single crystal bulk with few defects can be obtained.
- the (0 1-15) plane of the SiC single crystal and the (1 0-12) plane of the A1N single crystal are inclined at approximately 48 ° and 43 ° with respect to the C plane, respectively.
- the growth step (FIG. 1 (b)) of the A1N single crystal 2 is performed by a sublimation method.
- the growth furnace used for the sublimation method is not particularly limited as long as it is a commonly used single crystal growth furnace.
- the A1N single crystal 2 is effectively obtained from the viewpoint of obtaining the large-diameter A1N single crystal bulk 5. It is preferable to cut out in parallel with the growth surface 2a, but the cutting may be performed on other crystal planes. Thereafter, the A1N single crystal bulk 5 of the present invention is obtained by polishing the surface of the cut A1N single crystal portion 4.
- the A1N single crystal parc 5 produced by the above-mentioned steps is newly used as a seed crystal 5 (second seed crystal), and the surface of the seed crystal 5 is used. Furthermore, it is preferable to grow A1N single crystal 6 (second A1N single crystal) by a sublimation method to obtain A1N single crystal parc.
- the A1N single crystal Parc 5 as a new seed crystal 5 ′, it is possible to prevent the inclusion of Si and C into the A IN single crystal 6, and the seed crystal 5 and the crystal 6 grown on it. This is because homoepitaxial growth of both the force S and A1N single crystal makes it possible to effectively suppress the generation of new defects due to matching defects at the growth crystal interface 5 a with the seed crystal 5. .
- the size of the A1N single crystal barrier 5 obtained by the production method of the present invention can be freely changed depending on the size of the single crystal growth furnace, the use of the A1N single crystal, etc.
- a single crystal of a large size is preferable because most of the defects generated from the interface disappear and the disorder of crystal orientation is reduced.
- the defect density of the A1N single crystal Balta is as low as 1.0 ⁇ 10 6 cm 2 or less. If the diameter is less than 20 ⁇ ⁇ , the area is not sufficient for practical use, and if the thickness is less than 2 mm, defects in the A1N single crystal bulk cannot be sufficiently suppressed.
- There is no particular upper limit on the diameter and thickness but it is determined by restrictions on the manufacturing equipment such as the size of the holder 13 used during crystal growth.
- a high-quality semiconductor device can be obtained using the A1N crystal barrier according to the present invention.
- Examples of the semiconductor device containing an A1N crystal bulk according to the present invention include light emitting elements such as light emitting diodes and laser diodes, power transistors, and high frequency transistors.
- Example 1 a single crystal growth furnace as shown in FIG. 3 was used, and a commercially available A1N powder (average particle size: 1.2 / im) was preliminarily placed in a nitrogen atmosphere at about 1500-2000 ° C. Add with C The A1N agglomerate obtained by heat treatment and agglomeration is charged as a raw material 15, and a single crystal SiC having a diameter of 25 mm and a thickness of 1.0 mm is placed in the holder 13 as a seed crystal substrate 12, and the surface (crystal surface 2 1) Installed with force S (0 1— 1 5) surface and covered with a tungsten plate (not shown).
- A1N powder average particle size: 1.2 / im
- the atmospheric gas of the single crystal growth furnace 1 1, using the exhaust pump, 1.0X10- 3 Pa was evacuated to become less, in order to facilitate the evaporation of the adsorbed oxygen in the raw material 1 5
- the crucible 16 was heated to about 400 ° C.
- a nitrogen gas was introduced, where the single crystal growth furnace 1 1 reaches a predetermined pressure (in this case 5.0 ⁇ 10 4 Pa), reheated, the SiC substrate 1 2
- the temperature was raised to 1800-2000 ° C and the temperature on the raw material side was 2000-2300 ° C.
- the growth of the A1N single crystal begins on the crystal habit plane 21 of the substrate 12 and the crystal growth process (FIG. 1 (b)) is changed to a desired thickness (10 mm in this embodiment). It took 4 days to grow.
- the A1N single crystal 2 grown on the SiC substrate 12 is moved to a position of ⁇ ⁇ m from the interface between the SiC substrate 12 and the A1N single crystal 2 to the A1N single crystal side by using an inner peripheral cutting machine.
- the A1N single crystal portion 4 was cut from the SiC substrate 12 (FIG. 1 (c)). Polishing the cut surface of the separated A1N single crystal portion 4 yielded a sample A1N single crystal bulk 5 (Fig. L (d)).
- Example 2 the A1N single crystal Balta obtained in Example 1 is used as a new seed crystal 5, and the holder 1 has a crystal habit plane 2 1 force S (0 1 ⁇ 1 2) plane.
- A1N single crystal barta was obtained in the same manner as in Example 1 except that the step of growing A1N single crystal 6 (Fig. 1 (e)) was performed by setting it at 3. Comparative example
- Comparative Example 1 a commercially available SiC single crystal was cut out, and the crystal habit plane 21 was (000 1) A1N A1N was prepared in the same manner as in Example 1 except that the SiC single crystal used as the surface was placed on the holder 1 3 as a seed crystal substrate 1 2 and an A1N single crystal was grown on this habit plane 2 1. Single crystal parc was obtained. The evaluation methods of the tests conducted in this example and comparative example are shown below.
- the presence or absence of impurities was evaluated according to the following criteria by measuring the concentrations of Si and C contained in the A1N single crystals of Example 1 and Comparative Example 1 by GDMS (Glow Discharge Mass Spectrometry).
- defect density is determined by etching the polished wafer for 30 minutes using a eutectic of hydroxide power and sodium hydroxide, and then using an electron microscope. The number of defects in the range of ⁇ m was evaluated at five arbitrary locations, and the average value was evaluated according to the following criteria.
- Table 1 shows the evaluation results of the above tests.
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- Crystallography & Structural Chemistry (AREA)
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- Inorganic Chemistry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2719826A CA2719826C (en) | 2008-03-28 | 2009-03-26 | Aln bulk single crystal, semiconductor device using the same and method for producing the same |
EP09725314.0A EP2264228A4 (en) | 2008-03-28 | 2009-03-26 | ALN SOLID MONOCRYSTAL, SEMICONDUCTOR DEVICE, AND METHOD FOR PRODUCING ALN MASSIVE MONOCRYSTAL |
CN2009801190778A CN102046857B (zh) | 2008-03-28 | 2009-03-26 | AlN块状单晶、使用该单晶的半导体装置和生产该单晶的方法 |
US12/736,312 US20110081549A1 (en) | 2008-03-28 | 2009-03-26 | Ain bulk single crystal, semiconductor device using the same and method for producing the same |
KR1020107023377A KR101362014B1 (ko) | 2008-03-28 | 2009-03-26 | AlN 벌크 단결정 및 반도체 디바이스 그리고 AlN 단결정 벌크의 제조방법 |
Applications Claiming Priority (4)
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JP2008088059 | 2008-03-28 | ||
JP2008-088059 | 2008-03-28 | ||
JP2009063127A JP5461859B2 (ja) | 2008-03-28 | 2009-03-16 | AlNバルク単結晶及び半導体デバイス並びにAlN単結晶バルクの製造方法 |
JP2009-063127 | 2009-03-16 |
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WO2009119896A1 true WO2009119896A1 (ja) | 2009-10-01 |
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PCT/JP2009/056841 WO2009119896A1 (ja) | 2008-03-28 | 2009-03-26 | AlNバルク単結晶及び半導体デバイス並びにAlN単結晶バルクの製造方法 |
Country Status (8)
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US (1) | US20110081549A1 (ja) |
EP (1) | EP2264228A4 (ja) |
JP (1) | JP5461859B2 (ja) |
KR (1) | KR101362014B1 (ja) |
CN (1) | CN102046857B (ja) |
CA (1) | CA2719826C (ja) |
TW (1) | TWI558862B (ja) |
WO (1) | WO2009119896A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013133274A (ja) * | 2011-12-27 | 2013-07-08 | Fujikura Ltd | 種結晶保持部材、窒化アルミニウム単結晶の製造方法およびその製造装置 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5303941B2 (ja) * | 2008-01-31 | 2013-10-02 | 住友電気工業株式会社 | AlxGa1−xN単結晶の成長方法 |
JP5732288B2 (ja) * | 2011-03-18 | 2015-06-10 | 学校法人 名城大学 | 自立基板の製造方法 |
CN102618930B (zh) * | 2012-03-31 | 2015-09-09 | 哈尔滨工业大学 | 一种AlN晶体的制备方法 |
JP6999101B2 (ja) * | 2017-02-16 | 2022-01-18 | 国立大学法人埼玉大学 | エッチング方法 |
CN108166059A (zh) * | 2017-12-21 | 2018-06-15 | 北京华进创威电子有限公司 | 一种氮化铝衬底制备及扩径生长方法 |
DE112020003863T5 (de) * | 2019-08-15 | 2022-05-19 | Crystal Is, Inc. | Durchmessererweiterung von aluminiumnitridkristallen |
JP7397760B2 (ja) * | 2020-06-09 | 2023-12-13 | 株式会社東芝 | 発電素子 |
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JPH1053495A (ja) | 1996-06-04 | 1998-02-24 | Sumitomo Electric Ind Ltd | 窒化物単結晶及びその製造方法 |
JP2004284869A (ja) * | 2003-03-20 | 2004-10-14 | Univ Waseda | 窒化物単結晶の製造方法およびその製造装置 |
JP2007214547A (ja) * | 2006-01-12 | 2007-08-23 | Sumitomo Electric Ind Ltd | 窒化アルミニウム結晶の製造方法、窒化アルミニウム結晶、窒化アルミニウム結晶基板および半導体デバイス |
JP2007277074A (ja) * | 2006-01-10 | 2007-10-25 | Ngk Insulators Ltd | 窒化アルミニウム単結晶の製造方法及び窒化アルミニウム単結晶 |
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US8545629B2 (en) * | 2001-12-24 | 2013-10-01 | Crystal Is, Inc. | Method and apparatus for producing large, single-crystals of aluminum nitride |
US7601441B2 (en) * | 2002-06-24 | 2009-10-13 | Cree, Inc. | One hundred millimeter high purity semi-insulating single crystal silicon carbide wafer |
JP2004284969A (ja) | 2003-03-20 | 2004-10-14 | Tokuyama Corp | 歯科用酸素遮断材 |
JP5186733B2 (ja) * | 2005-07-29 | 2013-04-24 | 住友電気工業株式会社 | AlN結晶の成長方法 |
US20090087645A1 (en) * | 2006-01-12 | 2009-04-02 | Sumitomo Electric Industries, Ltd. | Method for Manufacturing Aluminum Nitride Crystal, Aluminum Nitride Crystal, Aluminum Nitride Crystal Substrate and Semiconductor Device |
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2009
- 2009-03-16 JP JP2009063127A patent/JP5461859B2/ja not_active Expired - Fee Related
- 2009-03-26 CA CA2719826A patent/CA2719826C/en not_active Expired - Fee Related
- 2009-03-26 KR KR1020107023377A patent/KR101362014B1/ko not_active IP Right Cessation
- 2009-03-26 EP EP09725314.0A patent/EP2264228A4/en not_active Withdrawn
- 2009-03-26 CN CN2009801190778A patent/CN102046857B/zh not_active Expired - Fee Related
- 2009-03-26 US US12/736,312 patent/US20110081549A1/en not_active Abandoned
- 2009-03-26 WO PCT/JP2009/056841 patent/WO2009119896A1/ja active Application Filing
- 2009-03-27 TW TW098110166A patent/TWI558862B/zh not_active IP Right Cessation
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JPH1053495A (ja) | 1996-06-04 | 1998-02-24 | Sumitomo Electric Ind Ltd | 窒化物単結晶及びその製造方法 |
JP2004284869A (ja) * | 2003-03-20 | 2004-10-14 | Univ Waseda | 窒化物単結晶の製造方法およびその製造装置 |
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Z.G. HERRO; B.M. EPELBAUM; M. BICKERMANN; C. SEITZ; A. MAGERL; A. WINNACKER: "Growth of 6H-SIC crystals along the [01 15] direction", JOURNAL OF CRYSTAL GROWTH, vol. 275, 2005, pages 496 - 503, XP004798812, DOI: doi:10.1016/j.jcrysgro.2004.12.024 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013133274A (ja) * | 2011-12-27 | 2013-07-08 | Fujikura Ltd | 種結晶保持部材、窒化アルミニウム単結晶の製造方法およびその製造装置 |
Also Published As
Publication number | Publication date |
---|---|
JP5461859B2 (ja) | 2014-04-02 |
EP2264228A1 (en) | 2010-12-22 |
CA2719826A1 (en) | 2009-10-01 |
EP2264228A4 (en) | 2015-06-17 |
TWI558862B (zh) | 2016-11-21 |
CN102046857A (zh) | 2011-05-04 |
CN102046857B (zh) | 2013-04-17 |
CA2719826C (en) | 2013-05-28 |
TW201005137A (en) | 2010-02-01 |
KR101362014B1 (ko) | 2014-02-11 |
JP2009256192A (ja) | 2009-11-05 |
KR20110008184A (ko) | 2011-01-26 |
US20110081549A1 (en) | 2011-04-07 |
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