JP7170521B2 - SiC単結晶の評価用サンプル取得方法 - Google Patents
SiC単結晶の評価用サンプル取得方法 Download PDFInfo
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- 239000013078 crystal Substances 0.000 title claims description 76
- 238000011156 evaluation Methods 0.000 title claims description 35
- 238000000034 method Methods 0.000 title claims description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 86
- 229910010271 silicon carbide Inorganic materials 0.000 description 85
- 235000012431 wafers Nutrition 0.000 description 31
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000002994 raw material Substances 0.000 description 8
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000001066 destructive effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000013441 quality evaluation Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000004854 X-ray topography Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000005092 sublimation method Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- C30B23/00—Single-crystal growth by condensing evaporated or sublimed materials
- C30B23/002—Controlling or regulating
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/205—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials using diffraction cameras
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- G—PHYSICS
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- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/2055—Analysing diffraction patterns
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- C—CHEMISTRY; METALLURGY
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- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
Description
Vapor Deposition:CVD)によって設けられたエピタキシャル膜が、SiC半導体デバイスの活性領域となる。
例えば、SiCインゴットの品質は、評価用ウェハを切断加工した後に、X線トポグラフ解析(XRT)等の非破壊検査及び、KOHエッチング等の破壊検査によって評価する(例えば、特許文献1を参照)。SiCインゴットの転位密度及び転位分布をより正確に評価するには破壊検査であるエッチングによるエッチピット検査が不可欠である。SiCインゴットの品質を充分評価してから取得するSiCウェハ枚数及び種結晶数を決定すると、SiC単結晶のロス量を低減できる。
図1は、SiCインゴットの製造装置の一例を示す模式図である。
SiCインゴットの製造装置100は、昇華法を利用したSiC単結晶の製造装置であり、原料を加熱することによって生じた原料ガスを単結晶(種結晶)上で再結晶化し、大きな単結晶(インゴット)を得ることができる。
なお、図1においては、理解を容易にするために、原料G、種結晶5及び種結晶から成長したSiCインゴット6を同時に図示しているが、実際の製造時にはこうした状態が存在するとは限らない。
図2は、SiCインゴット(SiC単結晶)の一例を示す模式図である。
なお、図2に示すSiCインゴットは、下側から上側に向けてc軸方向に沿って結晶成長させたものであり、図1の状態とは逆になっている。
その結果、従来は評価用サンプルとして用いていたSiCウェハ1枚分を製品ウェハとして用いることが可能になった。特に、このSiCウェハは、SiCインゴットの円錐台部の先端側から切り出されたものであり、高品質のSiCウェハを従来よりも1枚分多く得ることができた。
6…SiCインゴット(SiC単結晶)
6A…円錐台部
6B…ヘッド部
40…ヘッド部材
Claims (5)
- 種結晶からc軸に沿ってSiCを結晶成長させたSiCインゴットを用い、
結晶成長方向の先端面を成す湾曲面から前記種結晶に向かう所定の厚み位置で前記SiCインゴットを径方向に切断し、前記湾曲面を含むヘッド部材を得る工程と、
前記ヘッド部材のシリコン面を研磨して評価用サンプルを得る工程と、を有することを特徴とするSiC単結晶の評価用サンプル取得方法。 - 前記厚み位置は、前記SiCインゴットの直径が結晶成長方向に向かうにつれて縮径し始める位置よりも前記種結晶寄りに設定されることを特徴とする請求項1記載のSiC単結晶の評価用サンプル取得方法。
- 前記厚み位置は、前記湾曲面の先端と前記種結晶との間の長さであるSiC単結晶の全長に対して、前記湾曲面の先端から前記種結晶に向かって1%以上、30%以下の長さ範囲に設定されることを特徴とする請求項1記載のSiC単結晶の評価用サンプル取得方法。
- 前記湾曲面の先端を含む部分を研削して平坦面を形成する工程を更に備えることを特徴とする請求項1ないし3いずれか一項記載のSiC単結晶の評価用サンプル取得方法。
- 前記湾曲面の形状を象った支持面を有するサンプル支持部材に前記評価用サンプルを載置する工程を更に備えることを特徴とする請求項1ないし4いずれか一項記載のSiC単結晶の評価用サンプル取得方法。
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JP2018227984A JP7170521B2 (ja) | 2018-12-05 | 2018-12-05 | SiC単結晶の評価用サンプル取得方法 |
CN201911220551.8A CN111272505A (zh) | 2018-12-05 | 2019-12-03 | SiC单晶的评价用样品取得方法 |
US16/702,180 US11815437B2 (en) | 2018-12-05 | 2019-12-03 | Method of acquiring sample for evaluation of SiC single crystal |
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JP2016052961A (ja) | 2014-09-03 | 2016-04-14 | 三菱電機株式会社 | 炭化珪素単結晶、及びその製造方法 |
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US4912064A (en) * | 1987-10-26 | 1990-03-27 | North Carolina State University | Homoepitaxial growth of alpha-SiC thin films and semiconductor devices fabricated thereon |
JP2002228805A (ja) * | 2000-11-30 | 2002-08-14 | Nikon Corp | 樹脂接合型光学素子及びその成形型並びに光学物品 |
JP4818754B2 (ja) | 2006-03-01 | 2011-11-16 | 新日本製鐵株式会社 | 炭化珪素単結晶インゴットの製造方法 |
JP5250321B2 (ja) * | 2008-07-04 | 2013-07-31 | 昭和電工株式会社 | 炭化珪素単結晶成長用種結晶の製造方法並びに炭化珪素単結晶の製造方法 |
JP2010247305A (ja) * | 2009-04-20 | 2010-11-04 | Bridgestone Corp | 単結晶の研磨方法 |
JP5750363B2 (ja) * | 2011-12-02 | 2015-07-22 | 株式会社豊田中央研究所 | SiC単結晶、SiCウェハ及び半導体デバイス |
EP2851456A1 (en) * | 2012-04-20 | 2015-03-25 | II-VI Incorporated | Large Diameter, High Quality SiC Single Crystals, Method and Apparatus |
JP5668724B2 (ja) * | 2012-06-05 | 2015-02-12 | トヨタ自動車株式会社 | SiC単結晶のインゴット、SiC単結晶、及び製造方法 |
JP6046405B2 (ja) * | 2012-07-19 | 2016-12-14 | トヨタ自動車株式会社 | SiC単結晶のインゴット、その製造装置及びその製造方法 |
JP6197722B2 (ja) * | 2014-03-26 | 2017-09-20 | 新日鐵住金株式会社 | SiC板状体における転位の面内分布評価方法 |
JP6755524B2 (ja) * | 2015-09-30 | 2020-09-16 | 国立研究開発法人産業技術総合研究所 | p型4H−SiC単結晶及びp型4H−SiC単結晶の製造方法 |
CN108138359A (zh) * | 2015-10-02 | 2018-06-08 | 昭和电工株式会社 | SiC单晶锭 |
CN105525350A (zh) * | 2015-12-22 | 2016-04-27 | 中国电子科技集团公司第二研究所 | 一种生长大尺寸低缺陷碳化硅单晶和晶片的方法 |
JP6664133B2 (ja) * | 2016-04-27 | 2020-03-13 | 学校法人関西学院 | 傾斜支持台付き標準試料、その製造方法、走査型電子顕微鏡の評価方法、及びSiC基板の評価方法 |
US10576585B1 (en) * | 2018-12-29 | 2020-03-03 | Cree, Inc. | Laser-assisted method for parting crystalline material |
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