JP4414433B2 - SiC薄膜におけるエピ前表面処理方法 - Google Patents
SiC薄膜におけるエピ前表面処理方法 Download PDFInfo
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- JP4414433B2 JP4414433B2 JP2006520864A JP2006520864A JP4414433B2 JP 4414433 B2 JP4414433 B2 JP 4414433B2 JP 2006520864 A JP2006520864 A JP 2006520864A JP 2006520864 A JP2006520864 A JP 2006520864A JP 4414433 B2 JP4414433 B2 JP 4414433B2
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- polishing
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- 238000000034 method Methods 0.000 title claims description 49
- 239000010409 thin film Substances 0.000 title description 11
- 238000004381 surface treatment Methods 0.000 title 1
- 238000005498 polishing Methods 0.000 claims abstract description 45
- 238000000137 annealing Methods 0.000 claims abstract description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 7
- 239000008119 colloidal silica Substances 0.000 claims abstract description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 30
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 30
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- 238000000992 sputter etching Methods 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 230000001590 oxidative effect Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000006392 deoxygenation reaction Methods 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 238000005406 washing Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 12
- 239000000758 substrate Substances 0.000 description 8
- 238000000407 epitaxy Methods 0.000 description 5
- 229910003460 diamond Inorganic materials 0.000 description 4
- 239000010432 diamond Substances 0.000 description 4
- 238000004377 microelectronic Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910002704 AlGaN Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001534 heteroepitaxy Methods 0.000 description 1
- 238000001657 homoepitaxy Methods 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000004441 surface measurement Methods 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
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
-
- 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
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
-
- 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
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/07—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool
- B24B37/10—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for single side lapping
-
- 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
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
- H01L21/0201—Specific process step
- H01L21/02024—Mirror polishing
-
- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- 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
- 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
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02373—Group 14 semiconducting materials
- H01L21/02378—Silicon carbide
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/02428—Structure
- H01L21/0243—Surface structure
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02524—Group 14 semiconducting materials
- H01L21/02529—Silicon carbide
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02538—Group 13/15 materials
- H01L21/0254—Nitrides
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02656—Special treatments
- H01L21/02658—Pretreatments
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a 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 Table
- H01L29/1608—Silicon carbide
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S438/00—Semiconductor device manufacturing: process
- Y10S438/931—Silicon carbide semiconductor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Formation Of Insulating Films (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Surface Treatment Of Glass (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Description
・酸化雰囲気中でアニール工程を実施し(例えば1150℃で2時間)、その後、10%HF中で表面の脱酸素処理を行った。
・続いてCMPにより表面を研磨した。研磨は、次の条件にて実施した。
*研磨ヘッドを上に配置した回転研磨定盤を使用し、60rpm(この速度は10rpm〜100rpmの範囲内とすることができる)のオーダーの回転速度を適用するとともに、0.75bars(0.1bar〜1barの範囲内とすることができる)の圧力を加えた。
*使用したパッドは、RODELによって販売されている“ハード”型IC1000であり、SYTON W30型コロイダルシリカであるスラリーを用いた。
Claims (16)
- 炭化珪素ウェーハの表面を製造する方法であって、
前記ウェーハの表面における粗さを減ずるために、研磨を予定している表面の全体を酸化雰囲気に曝しつつ、前記ウェーハを酸化雰囲気中でアニールする工程と、
前記アニール工程を経て粗さが減じられた前記表面を、コロイダルシリカ粒子に基づく研磨剤を用いて研磨する工程と、
を含む、方法。 - 前記アニール工程を、1000℃〜1300℃の範囲の温度で実施する、請求項1記載の方法。
- 前記アニール工程を、1時間〜2.5時間の期間実施する、請求項1または請求項2記載の方法。
- 前記アニール工程と前記研磨工程との間に、前記表面の脱酸素工程をさらに含む、請求項1ないし請求項3のいずれか1項に記載の方法。
- 前記脱酸素工程を、フッ化水素酸中で実施する、請求項4記載の方法。
- 研磨後、化学洗浄工程を実施する、請求項1ないし請求項5のいずれか1項に記載の方法。
- 前記洗浄工程を、フッ化水素酸を用いて実施する、請求項6記載の方法。
- 前記アニール工程の前に、前記表面に対してイオンエッチング工程をさらに実施する、請求項1ないし請求項3のいずれか1項に記載の方法。
- 前記アニール工程と前記研磨工程との間に、前記表面に対してイオンエッチング工程をさらに実施する、請求項1ないし請求項3のいずれか1項に記載の方法。
- 前記アニール工程と前記イオンエッチング工程との間に、前記表面に対してRCA(SC1,SC2)形式の化学洗浄工程をさらに実施する、請求項9記載の方法。
- 前記研磨を、10rpm〜100rpmの範囲の速度で研磨ヘッドを回転させて実施する、請求項1ないし請求項10のいずれか1項に記載の方法。
- 0.1bar〜1barの範囲内の圧力を前記研磨ヘッドに加える、請求項1ないし請求項11のいずれか1項に記載の方法。
- 前記研磨を、15分〜30分の期間実施する、請求項1ないし請求項12のいずれか1項に記載の方法。
- 前記研磨を、IC1000型研磨パッドを用いて実施する、請求項1ないし請求項13のいずれか1項に記載の方法。
- 前記表面が前記ウェーハのシリコン面である、請求項1ないし請求項14のいずれか1項に記載の方法。
- 前記アニール工程で前記表面の粗さを20Årmsまたはそれ未満まで減らし、
前記研磨工程で前記表面の粗さを3Årmsまたはそれ未満までさらに減らす、請求項1ないし請求項15のいずれか1項に記載の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0308969A FR2857895B1 (fr) | 2003-07-23 | 2003-07-23 | Procede de preparation de surface epiready sur films minces de sic |
PCT/FR2004/001949 WO2005009684A1 (fr) | 2003-07-23 | 2004-07-22 | Procede de preparation de surface epiready sur films minces de sic |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2006528423A JP2006528423A (ja) | 2006-12-14 |
JP4414433B2 true JP4414433B2 (ja) | 2010-02-10 |
Family
ID=33561010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2006520864A Expired - Fee Related JP4414433B2 (ja) | 2003-07-23 | 2004-07-22 | SiC薄膜におけるエピ前表面処理方法 |
Country Status (9)
Country | Link |
---|---|
US (1) | US7060620B2 (ja) |
EP (1) | EP1646478B9 (ja) |
JP (1) | JP4414433B2 (ja) |
KR (1) | KR100792057B1 (ja) |
CN (1) | CN100496893C (ja) |
AT (1) | ATE353269T1 (ja) |
DE (1) | DE602004004658T4 (ja) |
FR (1) | FR2857895B1 (ja) |
WO (1) | WO2005009684A1 (ja) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3881562B2 (ja) * | 2002-02-22 | 2007-02-14 | 三井造船株式会社 | SiCモニタウェハ製造方法 |
WO2005099388A2 (en) * | 2004-04-08 | 2005-10-27 | Ii-Vi Incorporated | Chemical-mechanical polishing of sic surfaces using hydrogen peroixde or ozonated water solutions in combination with colloidal abrasive |
US7459702B2 (en) * | 2004-10-26 | 2008-12-02 | Jayant Neogi | Apparatus and method for polishing gemstones and the like |
FR2884647B1 (fr) * | 2005-04-15 | 2008-02-22 | Soitec Silicon On Insulator | Traitement de plaques de semi-conducteurs |
US7528040B2 (en) * | 2005-05-24 | 2009-05-05 | Cree, Inc. | Methods of fabricating silicon carbide devices having smooth channels |
DE102005024073A1 (de) * | 2005-05-25 | 2006-11-30 | Siltronic Ag | Halbleiter-Schichtstruktur und Verfahren zur Herstellung einer Halbleiter-Schichtstruktur |
JP5277722B2 (ja) * | 2008-05-21 | 2013-08-28 | 新日鐵住金株式会社 | 炭化珪素単結晶ウェハ表面の研磨方法 |
EP2172967A1 (en) | 2008-08-04 | 2010-04-07 | Siltronic AG | Method for manufacturing silicon carbide |
FR2954585B1 (fr) * | 2009-12-23 | 2012-03-02 | Soitec Silicon Insulator Technologies | Procede de realisation d'une heterostructure avec minimisation de contrainte |
JP5772635B2 (ja) * | 2012-02-02 | 2015-09-02 | 三菱電機株式会社 | 炭化珪素単結晶基板の製造方法 |
JP5990444B2 (ja) * | 2012-11-01 | 2016-09-14 | 昭和電工株式会社 | 炭化珪素半導体装置の製造方法 |
ES2869275T3 (es) | 2015-04-24 | 2021-10-25 | Int Flavors & Fragrances Inc | Sistemas de suministro y procedimientos de preparación del mismo |
ES2950434T3 (es) | 2016-09-16 | 2023-10-10 | Int Flavors & Fragrances Inc | Composiciones de microcápsula estabilizadas con agentes de control de la viscosidad |
CN117202986A (zh) | 2021-04-16 | 2023-12-08 | 国际香精香料公司 | 水凝胶封装物及其制造方法 |
WO2024026225A1 (en) | 2022-07-26 | 2024-02-01 | International Flavors & Fragrances Inc. | Robust flavor emulsions |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5895583A (en) * | 1996-11-20 | 1999-04-20 | Northrop Grumman Corporation | Method of preparing silicon carbide wafers for epitaxial growth |
US5877070A (en) * | 1997-05-31 | 1999-03-02 | Max-Planck Society | Method for the transfer of thin layers of monocrystalline material to a desirable substrate |
JP3085272B2 (ja) * | 1997-12-19 | 2000-09-04 | 富士電機株式会社 | 炭化けい素半導体装置の熱酸化膜形成方法 |
JP3762144B2 (ja) * | 1998-06-18 | 2006-04-05 | キヤノン株式会社 | Soi基板の作製方法 |
JP3975047B2 (ja) * | 2000-04-21 | 2007-09-12 | 泰弘 谷 | 研磨方法 |
JP4902088B2 (ja) * | 2000-07-10 | 2012-03-21 | ティーイーエル エピオン インク. | ガスクラスターイオンビーム処理による薄膜を改良するためのシステムおよび方法 |
JP3881562B2 (ja) * | 2002-02-22 | 2007-02-14 | 三井造船株式会社 | SiCモニタウェハ製造方法 |
FR2843061B1 (fr) | 2002-08-02 | 2004-09-24 | Soitec Silicon On Insulator | Procede de polissage de tranche de materiau |
-
2003
- 2003-07-23 FR FR0308969A patent/FR2857895B1/fr not_active Expired - Fee Related
- 2003-09-25 US US10/671,812 patent/US7060620B2/en not_active Expired - Fee Related
-
2004
- 2004-07-22 WO PCT/FR2004/001949 patent/WO2005009684A1/fr active IP Right Grant
- 2004-07-22 JP JP2006520864A patent/JP4414433B2/ja not_active Expired - Fee Related
- 2004-07-22 AT AT04767750T patent/ATE353269T1/de not_active IP Right Cessation
- 2004-07-22 DE DE602004004658T patent/DE602004004658T4/de not_active Expired - Lifetime
- 2004-07-22 CN CNB2004800209990A patent/CN100496893C/zh not_active Expired - Fee Related
- 2004-07-22 KR KR1020067001210A patent/KR100792057B1/ko not_active IP Right Cessation
- 2004-07-22 EP EP04767750A patent/EP1646478B9/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2857895A1 (fr) | 2005-01-28 |
FR2857895B1 (fr) | 2007-01-26 |
DE602004004658T2 (de) | 2007-11-22 |
ATE353269T1 (de) | 2007-02-15 |
EP1646478B1 (fr) | 2007-02-07 |
DE602004004658D1 (de) | 2007-03-22 |
WO2005009684A1 (fr) | 2005-02-03 |
US20050020084A1 (en) | 2005-01-27 |
US7060620B2 (en) | 2006-06-13 |
CN100496893C (zh) | 2009-06-10 |
DE602004004658T4 (de) | 2008-08-21 |
EP1646478B9 (fr) | 2008-07-16 |
EP1646478A1 (fr) | 2006-04-19 |
CN1826210A (zh) | 2006-08-30 |
KR100792057B1 (ko) | 2008-01-04 |
JP2006528423A (ja) | 2006-12-14 |
KR20060033806A (ko) | 2006-04-19 |
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