JP2014075380A - 炭化珪素半導体基板およびその製造方法 - Google Patents
炭化珪素半導体基板およびその製造方法 Download PDFInfo
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 117
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 116
- 239000004065 semiconductor Substances 0.000 title claims description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000000758 substrate Substances 0.000 title claims description 13
- 239000013078 crystal Substances 0.000 claims abstract description 179
- 230000007547 defect Effects 0.000 claims abstract description 24
- 230000000644 propagated effect Effects 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000005468 ion implantation Methods 0.000 claims description 3
- 230000001902 propagating effect Effects 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 2
- 239000010432 diamond Substances 0.000 claims description 2
- 238000001312 dry etching Methods 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 238000007373 indentation Methods 0.000 claims 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 238000012790 confirmation Methods 0.000 abstract description 3
- 235000012431 wafers Nutrition 0.000 description 59
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
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Abstract
【解決手段】種結晶1の状態から識別表示とされた刻印2を形成しておき、SiC単結晶3に結晶欠陥として刻印2が伝播されるようにする。これにより、SiC単結晶3を使用してSiCウェハ4を形成したときに、各SiCウェハ4には既に刻印2が形成された状態にすることができる。したがって、不正な手段により入手された高品質な種結晶1もしくはSiCウェハ4を種結晶として用いて結晶成長を行って更にSiCウェハ4を作成した場合であっても、その種結晶を使用したことを確認することが可能なSiCウェハ4にできる。
【選択図】図1
Description
本発明の第1実施形態について説明する。図1に示すように、高品質なSiCウェハからなる種結晶1を用意する。高品質なSiCからなる種結晶1の形成方法としては、従来より公知となっているどのような手法を用いても構わない。また、このとき用意する種結晶1の多形については6H、4H、3Hなどどのような多形であっても良く、面方位についてもa面、c面のSi面、c面のC面などどのような面方位であっても良い。
本発明の第2実施形態について説明する。本実施形態は、第1実施形態に対して刻印2の数を変更したものであり、それ以外の部分については第1実施形態と同様であるため、第1実施形態と異なる部分についてのみ説明する。
本発明の第3実施形態について説明する。本実施形態も、第1実施形態に対して刻印2の数を変更したものであり、それ以外の部分については第1実施形態と同様であるため、第1実施形態と異なる部分についてのみ説明する。
本発明の第4実施形態について説明する。本実施形態も、第1実施形態に対して刻印2の数を変更したものであり、それ以外の部分については第1実施形態と同様であるため、第1実施形態と異なる部分についてのみ説明する。
上記各実施形態では、刻印2の配置場所として様々な場所の例を挙げたが、上記各実施形態に示した場所以外であっても構わない。また、上記各実施形態で説明した配置場所を組み合わせて刻印2を形成するようにしても良い。
1a 段差
2 刻印
3 SiC単結晶
4 SiCウェハ
Claims (8)
- 炭化珪素単結晶にて構成され、少なくとも表面に結晶欠陥にて構成された識別表示としての刻印(2)が形成されていることを特徴とする炭化珪素半導体基板。
- 前記刻印のうちの全部もしくは一部が前記表面から前記裏面に掛けて貫通した結晶欠陥にて構成されていることを特徴とする請求項1に記載の炭化珪素半導体基板。
- 前記刻印は、外縁部の1箇所もしくは複数箇所に形成されていることを特徴とする請求項1または2に記載の炭化珪素半導体基板。
- 前記刻印のうちの全部もしくは一部は、文字、数字、バーコードおよびQRコードのうちの1つもしくは複数の組み合わせによって構成されていることを特徴とする請求項1ないし3のいずれか1つに記載の炭化珪素半導体基板。
- 請求項1ないし4のいずれか1つに記載の炭化珪素半導体基板を種結晶として用いて形成された炭化珪素単結晶であって、
前記刻印が結晶の成長方向に伝播されていると共に、結晶の表面から裏面に掛けて貫通した構造の結晶欠陥であることを特徴とする炭化珪素単結晶。 - 単結晶の炭化珪素にて構成される種結晶(1)を用意する工程と、
前記種結晶の少なくとも表面に結晶欠陥にて構成される識別表示としての刻印(2)を形成する工程と、
前記刻印を形成した前記種結晶の表面に、炭化珪素単結晶(3)を成長させることで、該成長方向において前記刻印を伝播させつつ前記炭化珪素単結晶を成長させる工程と、
前記刻印が伝播された前記炭化珪素単結晶を切り出してスライスすることで、前記刻印が形成された状態の炭化珪素半導体基板(4)を形成する工程と、を含んでいることを特徴とする炭化珪素半導体基板の製造方法。 - 前記刻印を形成する工程では、前記刻印をレーザ加工、ダイヤモンド刃具による切削加工、ドライエッチングもしくはイオン注入によって形成することを特徴とする請求項6に記載の炭化珪素半導体基板の製造方法。
- 前記炭化珪素単結晶を切り出した後の前記種結晶もしくは前記炭化珪素半導体基板を種結晶として、再度、炭化珪素単結晶を成長させることで、該成長方向において前記刻印を伝播させつつ前記炭化珪素単結晶を成長させる工程と、
さらに、前記刻印が伝播された前記炭化珪素単結晶を切り出してスライスすることで、再度、前記刻印が形成された状態の炭化珪素半導体基板を形成する工程と、を含んでいることを特徴とする請求項6または7に記載の炭化珪素半導体基板の製造方法。
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JP2012220403A JP5692195B2 (ja) | 2012-10-02 | 2012-10-02 | 炭化珪素単結晶、炭化珪素半導体基板およびその製造方法 |
PCT/JP2013/005415 WO2014054228A1 (ja) | 2012-10-02 | 2013-09-12 | 炭化珪素半導体基板およびその製造方法 |
DE112013004844.2T DE112013004844B4 (de) | 2012-10-02 | 2013-09-12 | Siliziumcarbidhalbleitersubstrat und Verfahren zur Herstellung hiervon |
CN201380051807.1A CN104704607B (zh) | 2012-10-02 | 2013-09-12 | 碳化硅半导体基板及其制造方法 |
KR1020157008203A KR101658506B1 (ko) | 2012-10-02 | 2013-09-12 | 탄화규소 단결정, 탄화규소 반도체 기판 및 탄화규소 반도체 기판의 제조 방법 |
US14/430,644 US9269576B2 (en) | 2012-10-02 | 2013-09-12 | Silicon carbide semiconductor substrate and method for manufacturing same |
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US20230344660A1 (en) * | 2022-04-20 | 2023-10-26 | EllansaLabs Inc. | System and Method for Etching Internal Surfaces of Transparent Gemstones with Information Pertaining to a Blockchain |
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DE10247017B4 (de) | 2001-10-12 | 2009-06-10 | Denso Corp., Kariya-shi | SiC-Einkristall, Verfahren zur Herstellung eines SiC-Einkristalls, SiC-Wafer mit einem Epitaxiefilm und Verfahren zur Herstellung eines SiC-Wafers, der einen Epitaxiefilm aufweist |
JP3745668B2 (ja) | 2001-10-12 | 2006-02-15 | 株式会社豊田中央研究所 | SiC単結晶の製造方法並びにSiC種結晶の製造方法 |
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