JP2016506902A - SiC結晶及び低転位密度結晶から切断したウェハ - Google Patents
SiC結晶及び低転位密度結晶から切断したウェハ Download PDFInfo
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Abstract
Description
2.関連技術
Claims (22)
- 種結晶上への気相輸送によってSiC結晶を形成する方法であって、
a.ケイ素及び炭素原子源を黒鉛製容器内に配置する工程であって、前記ケイ素及び炭素原子源がSiC結晶を成長させるために前記種結晶へ輸送するためのものである、工程と、
b.前記種結晶を前記黒鉛製容器内に配置し、前記種結晶を前記黒鉛製容器内のいかなる部分にも物理的に取り付けることなく、前記種結晶を前記黒鉛製容器内のシェルフ上で支持する、工程と、
c.蓋が前記種結晶と接触しないように前記容器に蓋を配置し、前記黒鉛製容器を真空炉内に配置する工程と、
d.前記炉を真空排気し、不活性ガスの流れを確立し、バルブにおける圧力を>600トルに制御する、工程と、
e.前記炉を2,000℃〜約2,500℃の温度に加熱する工程と、
f.前記炉を10トル〜約100トルの圧力に真空排気する工程と、
g.前記圧力を0.1及び100トルに制御する工程と、
h.結晶成長プロセス全体を通して前記種が前記蓋と接触するのを防止しながら、結晶成長を支持するように前記炉を維持し、それによってSiC結晶を形成する工程と、を含む、方法。 - 窒素ガスを前記炉内に流す工程を更に含む、請求項1に記載の方法。
- 前記真空炉が、結晶成長を支持し、それによって約0.1mm〜約50mmの厚さを有するSiC結晶を形成するように維持され、前記窒素流が、成長したSiC結晶の窒素濃度が1×1015/cm3〜1×1019/cm3であるように維持される、請求項2に記載の方法。
- 前記種結晶が、(11−20)結晶配向に向って0〜4度のオフ角を有する4H−SiC結晶であり、前記種結晶の窒素濃度が1×1016/cm3〜8×1018/cm3である、請求項1に記載の方法。
- 前記種結晶が、請求項1に記載の方法によって成長したSiC結晶をスライスすることによって形成される、請求項1に記載の方法によって作製されたSiC結晶。
- 前記シェルフと前記種との間にクッションリングを配置する工程を更に含む、請求項1に記載の方法。
- 前記種と前記蓋との間にクッションリングを配置する工程を更に含む、請求項1に記載の方法。
- 前記種が前記蓋と接触するのを防止する工程が、前記種と前記蓋との間に保持リングを配置する工程を含む、請求項1に記載の方法。
- 下部クッションリングを前記シェルフと前記種との間に配置し、上部クッションリングを前記種と前記蓋との間に配置し、保持リングを前記上部クッションリングと前記蓋との間に配置する工程を更に含む、請求項1に記載の方法。
- 前記上部クッションリングが前記下部クッションリングよりも厚い、請求項9に記載の方法。
- SiC結晶から切断され、4H−SiC基材で実施された少なくとも9の測定から求めたときに、約1/cm2未満の平均マイクロパイプ密度と、約5,000/cm2未満のらせん転位密度と、約5,000/cm2未満の基底面転位と、を有する4H−SiC基材。
- 1×1015/cm3〜1×1019/cm3の窒素濃度を更に有する、請求項11に記載の4H−SiCウェハ。
- 0.012〜0.030Ω・cmの抵抗率を更に有する、請求項12に記載の4H−SiCウェハ。
- SiC結晶を形成するためのシステムであって、
a.蓋と、その上に種を位置付けるためのシェルフと、を有する黒鉛製容器と、
b.全成長サイクルで前記種が前記蓋と接触するのを防ぎながら前記種の伸縮を可能とするクッションリングと、
c.誘導炉を約2,000℃〜約2,500℃の温度に加熱するためのヒーターと、
d.前記誘導炉を0.1トル〜>600トルの圧力に真空排気するためのポンプと、
e.前記誘導炉に不活性ガスを充満するためのガス入口と、を備える、システム。 - 前記クッションリングが、前記種の下に位置付けされた第1のクッションリングと、前記種の上に位置付けされた第2のクッションリングとを含む、請求項14に記載のシステム。
- 前記第2のクッションリングの上に位置付けされた黒鉛製保持リングを更に含む、請求項15に記載のシステム。
- 前記蓋が前記蓋の底面から延出する黒鉛製保持リングを含む、請求項14に記載のシステム。
- 既知の直径を有するディスク状の種上でSiC結晶成長を実施するための炉に使用する黒鉛製容器であって、
側壁と、黒鉛製の蓋を受け入れるように構成された開口上部と、を有する黒鉛製円筒形容器と、
前記側壁の上部に形成され、前記種の直径よりもわずかに小さい内径を有する円筒形シェルフであって、該円筒形シェルフが開口上部から規定距離下方に形成されており、それによってその上に前記種を配置及び支持することを可能にする、円筒形シェルフと、
前記開口上部と共に閉鎖を形成するように構成された黒鉛製の蓋と、
前記種が前記蓋と接触するのを防ぐ手段と、を含む、黒鉛製容器。 - 前記円筒形シェルフが前記側壁と一体に形成される、請求項18に記載の黒鉛製容器。
- 前記種よりもわずかに小さい直径を有する少なくとも1つのクッションリングを更に含み、前記種の下又は上に配置されるように構成された、請求項18に記載の黒鉛製容器。
- 前記側壁の内径内に適合する外径を有し、前記種の直径よりもわずかに小さい内径を有する黒鉛製保持リングを更に含み、前記保持リングが容器内部での前記種の垂直移動を制約するように上記種を配置するように構成されている、請求項20に記載の黒鉛製容器。
- 前記蓋が前記蓋の底面から延出する黒鉛製保持リングを含む、請求項18に記載の容器。
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361761171P | 2013-02-05 | 2013-02-05 | |
| US61/761,171 | 2013-02-05 | ||
| US14/058,167 US9797064B2 (en) | 2013-02-05 | 2013-10-18 | Method for growing a SiC crystal by vapor deposition onto a seed crystal provided on a support shelf which permits thermal expansion |
| US14/058,167 | 2013-10-18 | ||
| PCT/US2013/077285 WO2014123635A1 (en) | 2013-02-05 | 2013-12-20 | Sic crystal and wafer cut from crystal with low dislocation density |
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| JP2016506902A true JP2016506902A (ja) | 2016-03-07 |
| JP6663548B2 JP6663548B2 (ja) | 2020-03-13 |
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| Country | Link |
|---|---|
| US (2) | US9797064B2 (ja) |
| EP (1) | EP2954101B1 (ja) |
| JP (1) | JP6663548B2 (ja) |
| KR (1) | KR102137672B1 (ja) |
| CN (2) | CN105051268A (ja) |
| WO (1) | WO2014123635A1 (ja) |
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| US10435810B2 (en) | 2013-02-05 | 2019-10-08 | Dow Silicones Corporation | Graphite crucible for sublimation growth of SiC crystal |
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2013
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- 2013-12-20 CN CN201380074914.6A patent/CN105051268A/zh active Pending
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| US10435810B2 (en) | 2013-02-05 | 2019-10-08 | Dow Silicones Corporation | Graphite crucible for sublimation growth of SiC crystal |
Also Published As
| Publication number | Publication date |
|---|---|
| KR102137672B1 (ko) | 2020-07-24 |
| US9797064B2 (en) | 2017-10-24 |
| US20170137963A1 (en) | 2017-05-18 |
| WO2014123635A1 (en) | 2014-08-14 |
| US10435810B2 (en) | 2019-10-08 |
| CN105051268A (zh) | 2015-11-11 |
| JP6663548B2 (ja) | 2020-03-13 |
| EP2954101A1 (en) | 2015-12-16 |
| EP2954101B1 (en) | 2020-02-19 |
| US20140220296A1 (en) | 2014-08-07 |
| CN111676513A (zh) | 2020-09-18 |
| KR20150115902A (ko) | 2015-10-14 |
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