JP2008543565A - 溶融物質を精錬するための方法及び装置 - Google Patents
溶融物質を精錬するための方法及び装置 Download PDFInfo
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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
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/06—Silicon
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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
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
- C30B15/10—Crucibles or containers for supporting the melt
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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
- C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
- C30B11/003—Heating or cooling of the melt or the crystallised material
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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
- C30B35/00—Apparatus not otherwise provided for, specially adapted for the growth, production or after-treatment of single crystals or of a homogeneous polycrystalline material with defined structure
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- 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
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
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- 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
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
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- 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
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1032—Seed pulling
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- 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
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1032—Seed pulling
- Y10T117/1036—Seed pulling including solid member shaping means other than seed or product [e.g., EDFG die]
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- 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
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1032—Seed pulling
- Y10T117/1036—Seed pulling including solid member shaping means other than seed or product [e.g., EDFG die]
- Y10T117/1044—Seed pulling including solid member shaping means other than seed or product [e.g., EDFG die] including means forming a flat shape [e.g., ribbon]
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- 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
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1032—Seed pulling
- Y10T117/1068—Seed pulling including heating or cooling details [e.g., shield configuration]
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- 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
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1032—Seed pulling
- Y10T117/1072—Seed pulling including details of means providing product movement [e.g., shaft guides, servo means]
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- 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
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1076—Apparatus for crystallization from liquid or supercritical state having means for producing a moving solid-liquid-solid zone
- Y10T117/108—Including a solid member other than seed or product contacting the liquid [e.g., crucible, immersed heating element]
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- 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
- Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
- Y10T117/10—Apparatus
- Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
- Y10T117/1076—Apparatus for crystallization from liquid or supercritical state having means for producing a moving solid-liquid-solid zone
- Y10T117/1088—Apparatus for crystallization from liquid or supercritical state having means for producing a moving solid-liquid-solid zone including heating or cooling details
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- Crystallography & Structural Chemistry (AREA)
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- Organic Chemistry (AREA)
- Silicon Compounds (AREA)
Abstract
Description
本発明は種々の方法で実施することができ、以下においては、幾つかの態様を、図面を参照して例示する。
図1及び2は溶融シリカの指向性凝固用の装置を示す。この装置は加熱底部12、加熱端部壁13及び加熱側壁14を有する容器11からなる。容器11は外部ライニング15及び内部ライニング16で内張りされている。これらのライニング用の材料は熱伝導性であるが、化学的に安定なかつ耐熱性のものであるべきであり、適当な材料としては、グラファイト、炭化珪素、窒化珪素、シリカ、アルミナ、オキシ窒化珪素又は他のセラミック酸化物が挙げられる。内部ライニング16は珪素溶融物18用の囲い17を形成している。
太陽電池用のウエファーの製造用のインゴットを製造するために再溶融するためのインゴット、又は、太陽電池用のウエファーの直接的製造用のインゴットを更に製造するために使用する。接触層を交換し、プロセスを反復する。
Claims (18)
- 物質を精錬する方法において、容器内で物質の溶融物を形成させ;温度制御接触面を溶融物の表面と接触させ;溶融物質を凝固させかつ温度制御接触面に密着させ;ついで、溶融物質を下方に向けて次第に凝固させて、接触面に密着している物質の固体インゴットを形成させることを特徴とする物質の精錬方法。
- 温度制御接触面を冷却する、請求項1に記載の方法。
- 容器の壁及び底部を加熱する、請求項1又は2に記載の方法。
- 溶融物を不活性な又は制御された雰囲気中に保持する、前記請求項のいずれかに記載の方法。
- インゴットの凝固の後に残留する液状物質は原料物質より高い水準の不純物を含有しており、これを容器から除去する、前記請求項のいずれかに記載の方法。
- 物質は珪素である、前記請求項のいずれかに記載の方法。
- 珪素をドープして、最終凝固インゴットに必要とされる抵抗率を提供する、請求項6に記載の方法。
- 溶融状態の物質を収容するために配置された、底部と側壁を有する容器及び容器の頂部へ及び容器の頂部から移動し得る温度制御板とからなる物質の精錬装置。
- 容器は加熱された壁及び/又は底部を有する、請求項8に記載の装置。
- 容器は窒化珪素、グラファイト、炭化珪素、シリカ、アルミナ、オキシ窒化珪素又はセラミック酸化物で内張りされている、請求項8又は9に記載の装置。
- 温度制御板は、操作の際に冷却装置と接触させる熱伝導性層及び溶融物質と接触させるための接触層を包含する多数の層を有する、請求項8〜10のいずれかに記載の装置。
- 熱伝導性層は銅、アルミニウム又はこれらの金属の一方又は両者の合金から構成される、請求項11に記載の装置。
- 接触層はグラファイト、窒化珪素、炭化珪素、シリカ、アルミナ、オキシ窒化珪素又はセラミック酸化物から構成される、請求項11又は12に記載の装置。
- 熱伝導性層に取り付けられたかつ接触層とのスライディング又はスナップ嵌めを形成させる中間層を更に有する、請求項11〜13のいずれかに記載の装置。
- 温度制御板は加熱層を有する、請求項8〜14のいずれかに記載の装置。
- 温度制御板は単一の板又は平行な一連の板からなる、請求項8〜15のいずれかに記載の装置。
- 使用時に溶融物質と接触する温度制御板の表面は、粗面化されているか又は不連続的に形成されている、請求項8〜16のいずれかに記載の装置。
- 制御された又は不活性な雰囲気を許容するために容器全体を覆う気密カバーを有する、請求項8〜17のいずれかに記載の装置。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20052832 | 2005-06-10 | ||
| NO20052832A NO326797B1 (no) | 2005-06-10 | 2005-06-10 | Fremgangsmate og apparat for raffinering av smeltet materiale |
| PCT/NO2006/000174 WO2006132536A1 (en) | 2005-06-10 | 2006-05-10 | Method and apparatus for refining a molten material |
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| Publication Number | Publication Date |
|---|---|
| JP2008543565A true JP2008543565A (ja) | 2008-12-04 |
| JP5039696B2 JP5039696B2 (ja) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2008515642A Active JP5039696B2 (ja) | 2005-06-10 | 2006-05-10 | 溶融物質を精錬するための方法及び装置 |
Country Status (12)
| Country | Link |
|---|---|
| US (2) | US8580036B2 (ja) |
| EP (1) | EP1922437B1 (ja) |
| JP (1) | JP5039696B2 (ja) |
| KR (1) | KR100984926B1 (ja) |
| CN (2) | CN105088330A (ja) |
| AU (1) | AU2006255886B2 (ja) |
| BR (1) | BRPI0611809B1 (ja) |
| EA (1) | EA011381B1 (ja) |
| ES (1) | ES2723750T3 (ja) |
| NO (1) | NO326797B1 (ja) |
| UA (1) | UA86168C2 (ja) |
| WO (1) | WO2006132536A1 (ja) |
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| JP2013253298A (ja) * | 2012-06-08 | 2013-12-19 | Ulvac Japan Ltd | ターゲットユニットの製造方法及びターゲットユニットの製造装置 |
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| JP4748187B2 (ja) * | 2007-12-27 | 2011-08-17 | 国立大学法人東北大学 | Si結晶インゴットの製造方法 |
| EP2116637A3 (en) * | 2008-05-07 | 2012-03-21 | Covalent Materials Corporation | Crucible for melting silicon and release agent used to the same |
| US8545624B2 (en) * | 2008-06-20 | 2013-10-01 | Varian Semiconductor Equipment Associates, Inc. | Method for continuous formation of a purified sheet from a melt |
| WO2010025397A2 (en) * | 2008-08-31 | 2010-03-04 | Inductotherm Corp. | Directional solidification of silicon by electric induction susceptor heating in a controlled environment |
| US8317920B2 (en) | 2008-09-19 | 2012-11-27 | Memc Singapore Pte. Ltd. | Directional solidification furnace for reducing melt contamination and reducing wafer contamination |
| DE212009000126U1 (de) * | 2008-09-30 | 2011-12-20 | Nikolay N. Skaldin | Kristallisator |
| DE102008051492A1 (de) * | 2008-10-13 | 2010-04-15 | Pva Tepla Ag | Vorrichtung zum Kristallisieren von Nicht-Eisen-Metallen |
| NO20092797A1 (no) * | 2009-07-31 | 2011-02-01 | Nordic Ceramics As | Digel |
| WO2012073876A1 (ja) * | 2010-11-29 | 2012-06-07 | 株式会社アルバック | シリコン精錬装置及びシリコン精錬方法 |
| WO2012075306A2 (en) * | 2010-12-01 | 2012-06-07 | 1366 Technologies Inc. | Making semiconductor bodies from molten material using a free-standing interposer sheet |
| TWI532890B (zh) * | 2012-06-25 | 2016-05-11 | 希利柯爾材料股份有限公司 | 矽之控制定向固化 |
| FR3010716B1 (fr) | 2013-09-16 | 2015-10-09 | Commissariat Energie Atomique | Substrat pour la solidification de lingot de silicium |
| BR102013032779A2 (pt) * | 2013-12-19 | 2015-12-08 | Cia Ferroligas Minas Gerais Minasligas | processo e equipamento para purificação de silício por solidificação direcional |
| CN106591946A (zh) * | 2016-12-20 | 2017-04-26 | 大连理工大学 | 一种逆向离心提高多晶硅定向凝固提纯得率的设备和方法 |
| CN106757336A (zh) * | 2016-12-20 | 2017-05-31 | 大连理工大学 | 一种横向提高多晶硅定向凝固提纯得率的设备和方法 |
| CN107881555A (zh) * | 2017-10-24 | 2018-04-06 | 佛山市三水兴达涂料有限公司 | 一种半导体材料的加工装置及加工工艺 |
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| CN110205672B (zh) * | 2019-06-17 | 2021-06-01 | 常州常晶科技有限公司 | 一种类单晶硅晶体生长方法和热场结构 |
| CN112807733A (zh) * | 2020-12-29 | 2021-05-18 | 华祥(中国)高纤有限公司 | 一种低熔点聚酯切片的水搅拌结晶设备 |
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| US6824611B1 (en) | 1999-10-08 | 2004-11-30 | Cree, Inc. | Method and apparatus for growing silicon carbide crystals |
| CN1109778C (zh) * | 2000-08-16 | 2003-05-28 | 浙江大学 | 直拉硅单晶生长的重掺杂方法 |
| JP2002308616A (ja) * | 2001-04-06 | 2002-10-23 | Kawasaki Steel Corp | 多結晶シリコンの製造方法 |
| DE10124423A1 (de) * | 2001-05-18 | 2003-01-02 | Schott Glas | Züchten von orientierten Einkristallen mit wiederverwendbaren Kristallkeimen |
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| JP4307142B2 (ja) * | 2003-05-01 | 2009-08-05 | シャープ株式会社 | 薄板製造装置および薄板製造方法 |
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2005
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- 2006-05-10 JP JP2008515642A patent/JP5039696B2/ja active Active
- 2006-05-10 ES ES06733126T patent/ES2723750T3/es active Active
- 2006-05-10 CN CN201510342796.3A patent/CN105088330A/zh active Pending
- 2006-05-10 KR KR1020077029880A patent/KR100984926B1/ko active Active
- 2006-05-10 EP EP06733126.4A patent/EP1922437B1/en active Active
- 2006-05-10 CN CNA2006800207320A patent/CN101194051A/zh active Pending
- 2006-05-10 AU AU2006255886A patent/AU2006255886B2/en active Active
- 2006-05-10 US US11/916,898 patent/US8580036B2/en active Active
- 2006-05-10 BR BRPI0611809-7A patent/BRPI0611809B1/pt active IP Right Grant
- 2006-05-10 WO PCT/NO2006/000174 patent/WO2006132536A1/en not_active Ceased
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| JPS58217416A (ja) * | 1982-05-28 | 1983-12-17 | シ−メンス・アクチエンゲゼルシヤフト | 多結晶シリコン棒の製造方法および装置 |
| JP2000001308A (ja) * | 1998-06-15 | 2000-01-07 | Sharp Corp | 多結晶シリコン鋳塊の製造方法及びその製造装置 |
| JP2003048798A (ja) * | 2001-08-06 | 2003-02-21 | Sharp Corp | 結晶シートの製造装置、結晶シートの製造方法、それを用いて得られる結晶シートおよび太陽電池 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013253298A (ja) * | 2012-06-08 | 2013-12-19 | Ulvac Japan Ltd | ターゲットユニットの製造方法及びターゲットユニットの製造装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| US20080196209A1 (en) | 2008-08-21 |
| EP1922437A1 (en) | 2008-05-21 |
| BRPI0611809A2 (pt) | 2008-12-09 |
| WO2006132536A1 (en) | 2006-12-14 |
| NO326797B1 (no) | 2009-02-16 |
| EP1922437A4 (en) | 2014-10-29 |
| EA200800009A1 (ru) | 2008-04-28 |
| AU2006255886B2 (en) | 2010-03-25 |
| ES2723750T3 (es) | 2019-08-30 |
| KR100984926B1 (ko) | 2010-10-01 |
| CN101194051A (zh) | 2008-06-04 |
| KR20080015457A (ko) | 2008-02-19 |
| NO20052832L (no) | 2006-12-11 |
| JP5039696B2 (ja) | 2012-10-03 |
| AU2006255886A1 (en) | 2006-12-14 |
| BRPI0611809B1 (pt) | 2020-11-03 |
| EP1922437B1 (en) | 2019-02-20 |
| UA86168C2 (uk) | 2009-03-25 |
| NO20052832D0 (no) | 2005-06-10 |
| EA011381B1 (ru) | 2009-02-27 |
| US8580036B2 (en) | 2013-11-12 |
| US20100034723A1 (en) | 2010-02-11 |
| CN105088330A (zh) | 2015-11-25 |
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