WO2018164197A1 - 多結晶シリコン加工品の製造方法 - Google Patents
多結晶シリコン加工品の製造方法 Download PDFInfo
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- WO2018164197A1 WO2018164197A1 PCT/JP2018/008827 JP2018008827W WO2018164197A1 WO 2018164197 A1 WO2018164197 A1 WO 2018164197A1 JP 2018008827 W JP2018008827 W JP 2018008827W WO 2018164197 A1 WO2018164197 A1 WO 2018164197A1
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- WIPO (PCT)
- Prior art keywords
- polycrystalline silicon
- carbon member
- silicon rod
- rod
- coating material
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/02—Silicon
- C01B33/021—Preparation
- C01B33/027—Preparation by decomposition or reduction of gaseous or vaporised silicon compounds other than silica or silica-containing material
- C01B33/035—Preparation by decomposition or reduction of gaseous or vaporised silicon compounds other than silica or silica-containing material by decomposition or reduction of gaseous or vaporised silicon compounds in the presence of heated filaments of silicon, carbon or a refractory metal, e.g. tantalum or tungsten, or in the presence of heated silicon rods on which the formed silicon is deposited, a silicon rod being obtained, e.g. Siemens process
Definitions
- the present invention relates to a novel method for producing a processed polycrystalline silicon product. Specifically, when handling a polycrystalline silicon rod obtained by the Siemens method, a process for preventing polycrystalline silicon rod contamination by a carbon member present at the end of the polycrystalline silicon rod is included.
- the present invention provides a novel method for manufacturing a product.
- Polycrystalline silicon used as a raw material for semiconductor or solar cell wafers is usually a Siemens method, as shown in FIG. 1, a silicon core wire assembled in an inverted U-shape as a seed rod in a reactor 1. 2 is held by the carbon member 4 connected to the electrode 3, and polycrystalline silicon is deposited on the surface of the silicon core wire to obtain a polycrystalline silicon rod 5. Thereafter, the polycrystalline silicon rod is removed from the electrode in a state where the carbon member is present at the end thereof, and, for example, as shown in FIG. Disconnect. After that, if necessary, the polycrystalline silicon rod is crushed to an appropriate size, and washed to remove contaminants attached to the surface of the polycrystalline silicon, resulting in a processed product such as a nugget or cut rod. Turn into.
- the carbon member is naturally accommodated in the plastic bag.
- the broken pieces of the carbon member may come into contact with the surface of the polycrystalline silicon rod in the plastic bag, thereby causing carbon contamination.
- the rod may be housed in a plastic bag, but when the carbon member is removed, part of the carbon is scattered and reacted. May contaminate the vessel and rod.
- an object of the present invention is to prevent a carbon contamination on the surface of the polycrystalline silicon rod by the carbon member existing at the end of the polycrystalline silicon rod when handling the polycrystalline silicon rod obtained by the Siemens method.
- Another object of the present invention is to provide a novel method for producing a processed polycrystalline silicon product.
- the inventors of the present invention have intensively studied to achieve the above object. As a result, the inventors have found that the above object can be achieved by coating the carbon member existing at the end of the polycrystalline silicon rod with a coating material, and have completed the present invention.
- the present invention provides a polycrystalline silicon rod obtained by depositing polycrystalline silicon on a silicon core wire held by a carbon member connected to an electrode in a reactor by a Siemens method, and the carbon member at the end thereof.
- the carbon member present at the end of the polycrystalline silicon rod is removed using the coating material until the polycrystalline silicon rod is removed from the electrode and processed.
- a method for producing a processed polycrystalline silicon product comprising a step of handling the polycrystalline silicon rod and the carbon member in a separated state by coating.
- the lower part of the polycrystalline silicon rod is preferably covered with a covering material together with the carbon member. In this case, it is preferable to cover a region of 200 mm or less from the end of the polycrystalline silicon rod.
- the lower part of the polycrystalline silicon rod is covered with a coating material together with the carbon member, and the upper part or the whole of the polycrystalline silicon rod is covered with another coating material.
- the processing method of the present invention includes a step of removing the carbon member from the polycrystalline silicon rod, and in this case, it is preferable to remove the carbon member in a state where the carbon member is covered with a coating material.
- the covering material is preferably a resin covering material, and more preferably a polyethylene film or a bag.
- the processed polycrystalline silicon product of the present invention is obtained by the above-described method, and is preferably a crushed product of polycrystalline silicon called chunk, nugget, chip or the like.
- the manufacturing method of the present invention includes a step of handling the carbon member with a coating material so that the polycrystalline silicon rod and the carbon member are isolated from each other.
- Carbon contamination on the surface of the crystalline silicon rod specifically, when the polycrystalline silicon rod is taken out of the reactor or loaded on the carriage, the carbon member existing at the end directly contacts the surface of the neighboring polycrystalline silicon rod Carbon contamination caused by the operation, or while the polycrystalline silicon rod is being transported by the carriage, a part of the carbon member is broken down, and the broken pieces of the carbon member are brought into contact with the surface of the polycrystalline silicon rod on the carriage.
- the resulting carbon contamination can be effectively avoided, resulting in stable and clean polycrystalline silicon It is possible to obtain the processed goods.
- the polycrystalline silicon rod is a polycrystalline silicon columnar product obtained using a Siemens reactor as shown in FIG. 1, and is made of polycrystalline silicon deposited on the surface of the silicon core wire. According to the Siemens method, an inverted U-shaped shape can be obtained.
- the polycrystalline silicon rod of the present invention may have an L-shaped shape lacking a part of the inverted U-shaped shape or a rod shape. May be.
- the end portion of the polycrystalline silicon rod is a portion in contact with the upper end portion of the carbon member.
- the rod at the end portion and the vicinity thereof may be referred to as a “lower portion” of the rod.
- the upper part of the polycrystalline silicon rod means a part other than the lower part, and means a part away from the carbon member.
- the polycrystalline silicon rod and the carbon member at the end thereof may be collectively referred to as “the whole”.
- the polycrystalline silicon rod obtained by the Siemens method is obtained by depositing polycrystalline silicon on the surface of the silicon core wire held by the carbon member as described above. At this time, polycrystalline silicon is partially deposited not only on the surface of the silicon core wire but also on the surface of the carbon member, and the carbon member and the polycrystalline silicon rod are integrated. Therefore, after the precipitation reaction, in the reactor, the polycrystalline silicon rod is removed from the electrode in a state including a carbon member at the end thereof.
- the removed polycrystalline silicon rod is an inverted U-shaped object (FIG. 3 (a)), and is an inverted L-shaped that is broken from the portions corresponding to the upper ends of the silicon core wire assembled in an inverted U-shape. It is a shaped object (FIG. 3B) or a rod-shaped object (FIG. 3C).
- the greatest feature of the present invention is that the polycrystalline silicon rod and the carbon member are coated with a coating material after the precipitation reaction until the polycrystalline silicon rod is removed from the electrode and processed. And a process of handling them in an isolated state.
- the period from when the polycrystalline silicon rod is removed from the electrode and processed until the polycrystalline silicon rod includes a carbon member at the end in the reactor. It refers to the period from immediately after removal from the electrode until the carbon member is separated from the polycrystalline silicon rod and is not in contact. In order to fully exhibit the effects of the present invention, it is preferable to coat the carbon member that causes carbon contamination on the surface of the polycrystalline silicon rod at an early stage because the contamination can be avoided.
- the time of the coating is as follows: when the polycrystalline silicon rod is removed from the electrode in the reactor, when the polycrystalline silicon rod is taken out of the reactor, when the polycrystalline silicon rod is lowered onto the carriage, The rod is loaded on a carriage, and the most preferable is immediately after removing the polycrystalline silicon rod from the electrode in the reactor.
- the aspect in which the carbon member present at the end of the polycrystalline silicon rod is coated with a coating material is used to isolate the polycrystalline silicon rod from the carbon member. All aspects that result in the above state are included.
- the “isolated state” refers to a state where the surface of a certain rod and the carbon member at the other end of the rod are not in direct contact. For example, it includes a mode of covering at least the entire surface of the carbon member and covering the broken pieces of the carbon member so that they do not scatter and come into contact with the surface of the polycrystalline silicon rod. Therefore, the aspect which coat
- the material of the covering material is not particularly limited, and may be made of resin, cloth, or paper.
- a resin coating material that is low in contamination, flexible, and easy to handle is preferably used.
- an example of using the resin coating material will be described.
- a cloth or paper coating material may be used.
- Specific embodiments of covering the carbon member with the resin coating material include (1) an embodiment in which a carbon film is covered with a resin film or a resin bag, and (2) a resin cap is used. Then, an aspect of mounting on a carbon member, (3) an aspect of immersing the carbon member in a resin solution, and forming a film on the surface of the carbon member, and the like.
- the end of the polycrystalline silicon rod on the side where the carbon member is present is placed in the center of the substantially square resin film, and the opposite ends of the resin film are raised.
- a bag formed from a resin film is covered from the end of the polycrystalline silicon rod.
- the resin film may be in close contact with the carbon member, or there may be a gap between the resin film and the carbon member.
- a mode in which a belt-shaped resin film is covered around a carbon member is also exemplified.
- the resin film is not particularly limited as long as it has mechanical properties that do not cause breakage during the removal or transportation.
- the resin film is made of polyethylene having a thickness of 100 to 1000 ⁇ m. Examples include films and polyethylene bags.
- the resin cap (2) is made of a material having elasticity such as rubber, for example, and is a molded body formed in accordance with the shape of the end of the polycrystalline silicon rod on the side where the carbon member is present. One end is closed and the other end forms an opening.
- the inner surface the surface in contact with the carbon member
- the washing is preferably acid washing.
- a rubber material selected from urethane rubber, latex rubber, butadiene resin, polyvinyl alcohol, liquid butyl rubber, liquid rubber, natural rubber, nitrile rubber, chloroprene rubber, vinyl acetate rubber, etc.
- organic solvents such as tetrahydrofuran, acetonitrile, a trichloroethane, a trichloroethylene, a methylene chloride, toluene, xylene, is mentioned.
- the length L of the covered region of the rod is set to the polycrystalline silicon rod as shown in the figure. It is preferably 200 mm or less from the end, and more preferably 100 mm or less, in the region wrapped with the coating material, carbon member fragments and the like are generated inside, and the rod is easily subjected to carbon contamination.
- the yield of polycrystalline silicon with little carbon contamination can be increased by reducing the length L of the coating region, and the rod in the region wrapped in the coating material can be used for applications where carbon contamination is not a problem. Can be used.
- the manner of covering with the covering material is not limited to these, and in order to avoid the polycrystalline silicon rod from directly contacting various members or the like, the lower portion of the polycrystalline silicon rod, While covering with a carbon member with a coating material, you may coat
- a bag made of a resin film is placed on the end of the polycrystalline silicon rod on the side where the carbon member exists, and another resin bag is placed on the top of the polycrystalline silicon rod or the carbon member and the polycrystal.
- a mode of covering the whole including the silicon rod is also adopted.
- the processing method of the present invention preferably includes a step of removing the carbon member in a state where the carbon member is covered with the covering material.
- a preferred method for producing a processed polycrystalline silicon product of the present invention as described above, after the polycrystalline silicon rods in which the carbon member is coated with a coating material are transported together to the processing chamber by a carriage or the like, the above-mentioned The carbon member is removed.
- the removal of the carbon member is performed, for example, by cutting off the lower end portion of the rod or by knocking off the carbon member with a high hardness tool such as a hammer.
- the polycrystalline silicon rod is transported to the processing chamber in a state where the carbon member is covered with the covering material, and the carbon member is removed in the covered state. It is preferable to remove the carbon member in a state where the carbon member is entirely covered with a covering material. Furthermore, it is preferable to remove the carbon member in a state where the lower part of the polycrystalline silicon rod is covered with a covering material and all the carbon member is covered with the covering material. By doing so, it is possible to prevent the carbon member from being broken and the fragments from being scattered due to an impact when the carbon member is separated or an impact when the separated carbon member falls on the ground. For this reason, for example, secondary contamination of the surface of the polycrystalline silicon rod caused by the above-mentioned fragments scattered throughout the processing chamber can be prevented.
- the coating material is detached from the carbon member as necessary after separating the carbon member from the polycrystalline silicon rod so as not to contact.
- the method of the present invention carbon contamination of the surface of the polycrystalline silicon rod by the carbon member can be effectively avoided, and as a result, a polycrystalline silicon processed product having a stable and high cleanliness can be obtained.
- the processed polycrystalline silicon product include a crushed polycrystalline silicon obtained by crushing a polycrystalline silicon rod. This crushed material is sometimes called a chunk, nugget, chip or the like depending on its size. Further, a cut rod obtained by cutting a polycrystalline silicon rod into a columnar shape may be used.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Silicon Polymers (AREA)
Abstract
Description
多結晶シリコンロッドとは、図1に示すようなジーメンス反応炉を用いて得られる多結晶シリコンの柱状物であり、シリコン芯線の表面に析出した多結晶シリコンからなる。ジーメンス法によれば、逆U字型形状で得られるが、本発明の多結晶シリコンロッドは、逆U字型形状の一部が欠けたL字型形状であってもよく、また棒状であってもよい。
また、多結晶シリコンロッドの端部とは、カーボン部材の上端部に接する部分である。この端部およびその近傍領域のロッドを、ロッドの「下部」と表記することもある。
多結晶シリコンロッドの上部とは、前記下部以外の部分を示し、カーボン部材からの離れた部分をいう。
また、多結晶シリコンロッドと、その端部のカーボン部材とを合わせて、「全体」と呼ぶことがある。
多結晶シリコン加工品としては、多結晶シリコンロッドを破砕して得られる多結晶シリコンの破砕物が挙げられる。この破砕物は、そのサイズに応じてチャンク、ナゲット、チップなどと呼ばれることがある。また多結晶シリコンロッドを柱状に切断して得られるカットロッドであってもよい。
2 シリコン芯線
3 電極
4 カーボン部材
5 多結晶シリコンロッド
6 台車
7 被覆材
Claims (9)
- ジーメンス法による反応器内で電極に接続したカーボン部材に保持されたシリコン芯線に多結晶シリコンを析出せしめて得られた多結晶シリコンロッドを、その端部に上記カーボン部材を含む状態で取り出し、これを加工する方法において、上記多結晶シリコンロッドを上記電極から取り外し、加工するまでの間に、上記多結晶シリコンロッドの端部に存在するカーボン部材を、被覆材を用いて被覆することにより、多結晶シリコンロッドとカーボン部材とを隔離した状態で取り扱う工程を含むことを特徴とする、多結晶シリコン加工品の製造方法。
- 前記多結晶シリコンロッドの下部を、カーボン部材とともに被覆材で被覆する請求項1に記載の多結晶シリコン加工品の製造方法。
- 前記多結晶シリコンロッドの下部を、カーボン部材とともに被覆材で被覆する際に、該多結晶シリコンロッドの端部から200mm以下までの領域を被覆する、請求項1に記載の多結晶シリコン加工品の製造方法。
- 前記多結晶シリコンロッドの下部を、カーボン部材とともに被覆材で被覆するとともに、該多結晶シリコンロッドの上部または全体を他の被覆材で被覆する請求項1に記載の多結晶シリコン加工品の製造方法。
- カーボン部材が被覆材により被覆された状態で、カーボン部材を除去する工程を含む請求項1~4のいずれかに記載の多結晶シリコン加工品の製造方法。
- 前記被覆材が樹脂製被覆材である請求項1~5のいずれかに記載の多結晶シリコン加工品の製造方法。
- 前記樹脂製被覆材が、ポリエチレン製フィルムまたはバッグである請求項6に記載の多結晶シリコン加工品の製造方法。
- 請求項1~7のいずれかに記載の方法により得られる多結晶シリコン加工品。
- 多結晶シリコンの破砕品である、請求項8に記載の多結晶シリコン加工品。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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EP18763924.0A EP3578514A4 (en) | 2017-03-08 | 2018-03-07 | METHOD OF MANUFACTURING A POLYCRYSTALLINE SILICON PROCESSED ARTICLE |
KR1020197024686A KR102361373B1 (ko) | 2017-03-08 | 2018-03-07 | 다결정 실리콘 가공품의 제조방법 |
CN201880013910.XA CN110352177B (zh) | 2017-03-08 | 2018-03-07 | 多晶硅加工品的制造方法 |
JP2019504647A JP6998936B2 (ja) | 2017-03-08 | 2018-03-07 | 多結晶シリコン加工品の製造方法 |
SG11201907860QA SG11201907860QA (en) | 2017-03-08 | 2018-03-07 | Method for producing polycrystalline silicon processed article |
US16/488,960 US11332377B2 (en) | 2017-03-08 | 2018-03-07 | Method for producing polycrystalline silicon processed article |
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JP2017-044202 | 2017-03-08 | ||
JP2017044202 | 2017-03-08 |
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WO2018164197A1 true WO2018164197A1 (ja) | 2018-09-13 |
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PCT/JP2018/008827 WO2018164197A1 (ja) | 2017-03-08 | 2018-03-07 | 多結晶シリコン加工品の製造方法 |
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US (1) | US11332377B2 (ja) |
EP (1) | EP3578514A4 (ja) |
JP (1) | JP6998936B2 (ja) |
KR (1) | KR102361373B1 (ja) |
CN (1) | CN110352177B (ja) |
SG (1) | SG11201907860QA (ja) |
TW (1) | TWI781986B (ja) |
WO (1) | WO2018164197A1 (ja) |
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JP6373724B2 (ja) * | 2014-11-04 | 2018-08-15 | 株式会社トクヤマ | 芯線ホルダ及びシリコンの製造方法 |
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JP2011063471A (ja) * | 2009-09-16 | 2011-03-31 | Shin-Etsu Chemical Co Ltd | 多結晶シリコン塊および多結晶シリコン塊の製造方法 |
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IT1246735B (it) | 1990-06-27 | 1994-11-26 | Union Carbide Coatings Service | Mandrino di grafie per un filamento iniziatore nella fabbricazione di silicio policristallino e metodo di protezione. |
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DE102010003064A1 (de) * | 2010-03-19 | 2011-09-22 | Wacker Chemie Ag | Graphitelektrode |
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DE102014222883A1 (de) * | 2014-11-10 | 2016-05-12 | Wacker Chemie Ag | Polykristallines Siliciumstabpaar und Verfahren zur Herstellung von polykristallinem Silicium |
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2018
- 2018-03-07 WO PCT/JP2018/008827 patent/WO2018164197A1/ja unknown
- 2018-03-07 CN CN201880013910.XA patent/CN110352177B/zh active Active
- 2018-03-07 SG SG11201907860QA patent/SG11201907860QA/en unknown
- 2018-03-07 US US16/488,960 patent/US11332377B2/en active Active
- 2018-03-07 JP JP2019504647A patent/JP6998936B2/ja active Active
- 2018-03-07 KR KR1020197024686A patent/KR102361373B1/ko active IP Right Grant
- 2018-03-07 EP EP18763924.0A patent/EP3578514A4/en active Pending
- 2018-03-08 TW TW107107895A patent/TWI781986B/zh active
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JP2011051837A (ja) * | 2009-09-02 | 2011-03-17 | Toyo Tanso Kk | シード保持部材及びそのシード保持部材を用いた多結晶シリコン製造方法 |
JP2011063471A (ja) * | 2009-09-16 | 2011-03-31 | Shin-Etsu Chemical Co Ltd | 多結晶シリコン塊および多結晶シリコン塊の製造方法 |
JP2013159504A (ja) * | 2012-02-02 | 2013-08-19 | Shin-Etsu Chemical Co Ltd | 多結晶シリコン棒搬出冶具および多結晶シリコン棒の刈取方法 |
JP2017503747A (ja) * | 2014-01-22 | 2017-02-02 | ワッカー ケミー アクチエンゲゼルシャフトWacker Chemie AG | 多結晶シリコンの製造方法 |
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Non-Patent Citations (1)
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See also references of EP3578514A4 |
Also Published As
Publication number | Publication date |
---|---|
KR20190120758A (ko) | 2019-10-24 |
JP6998936B2 (ja) | 2022-01-18 |
CN110352177B (zh) | 2023-08-01 |
EP3578514A1 (en) | 2019-12-11 |
SG11201907860QA (en) | 2019-09-27 |
JPWO2018164197A1 (ja) | 2020-01-23 |
US20200010327A1 (en) | 2020-01-09 |
KR102361373B1 (ko) | 2022-02-10 |
TW201836979A (zh) | 2018-10-16 |
TWI781986B (zh) | 2022-11-01 |
CN110352177A (zh) | 2019-10-18 |
EP3578514A4 (en) | 2020-10-07 |
US11332377B2 (en) | 2022-05-17 |
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