JP2021143091A5 - - Google Patents
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- JP2021143091A5 JP2021143091A5 JP2020042895A JP2020042895A JP2021143091A5 JP 2021143091 A5 JP2021143091 A5 JP 2021143091A5 JP 2020042895 A JP2020042895 A JP 2020042895A JP 2020042895 A JP2020042895 A JP 2020042895A JP 2021143091 A5 JP2021143091 A5 JP 2021143091A5
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- JP
- Japan
- Prior art keywords
- raw material
- silicon
- silicon raw
- container
- cleaning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 31
- 229910052710 silicon Inorganic materials 0.000 description 31
- 239000010703 silicon Substances 0.000 description 31
- 239000002994 raw material Substances 0.000 description 21
- 238000004140 cleaning Methods 0.000 description 11
- 239000011347 resin Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 239000013078 crystal Substances 0.000 description 5
- -1 (trademark) Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Images
Description
前記シリコン原料Sの洗浄では、洗浄液Lとして例えばフッ酸、硝酸、或いは過酸化水素水等の薬液が使用されるため、シリコン原料Sを収容する樹脂製容器50としては耐薬液性のテフロン(登録商標)、ポリプロピレン、或いは塩化ビニール等の樹脂が一般に用いられている。 In the cleaning of the silicon raw material S , a chemical solution such as hydrofluoric acid, nitric acid, or hydrogen peroxide solution is used as the cleaning solution L. Therefore, the resin container 50 for accommodating the silicon raw material S is a chemical resistant Teflon (registered). Resins such as (trademark), polypropylene, or vinyl chloride are generally used.
しかしながら、前記シリコン原料Sの収容容器として樹脂材料を使用すると、シリコン原料Sと樹脂との擦れにより樹脂異物がシリコン原料Sに付着する。そのため、この原料を溶解した際にシリコン溶融液に炭素成分が混入し、結晶の炭素濃度が上昇するという課題があった。 However, when the resin material is used as the container for the silicon raw material S , the resin foreign matter adheres to the silicon raw material S due to the rubbing between the silicon raw material S and the resin. Therefore, when this raw material is melted, a carbon component is mixed in the silicon melt, and there is a problem that the carbon concentration of the crystal increases.
以下、本発明の好適な実施形態について図面を参照して説明する。
図1は、本発明のシリコン原料の洗浄装置の概略構成を示すブロック図である。図2は、図1のシリコン原料洗浄装置が備えるシリコン原料収容容器の斜視図であり、図3はその断面図である。
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of the silicon raw material cleaning device of the present invention. FIG. 2 is a perspective view of a silicon raw material storage container included in the silicon raw material cleaning device of FIG. 1, and FIG. 3 is a cross-sectional view thereof.
シリコン原料を収容するシリコン原料収容装置20は、図2、図3に示すように外側容器を形成する樹脂製容器(例えばPTFE製)21と、この樹脂製容器21の内側の全面に配置されたシリコン製板部材22とを備えている。
前記樹脂製容器21は、酸洗浄槽1に浸漬されることになるため、耐薬液性の例えばPTFE(ポリテトラフルオロエチレン)により形成されている。
前記樹脂製容器21とシリコン製板部材22とには、複数の貫通孔21a、22aが形成されており、シリコン原料収容容器20が酸洗浄槽1中に浸漬された場合には、前記貫通孔21a、22aから容器20中に浸入した洗浄液によりシリコン原料Sが洗浄されることになる。
As shown in FIGS. 2 and 3, the silicon raw material accommodating device 20 accommodating the silicon raw material is arranged on a resin container (for example, made of PTFE) 21 forming an outer container and the entire inner surface of the resin container 21. It is provided with a silicon plate member 22.
Since the resin container 21 is immersed in the pickling tank 1, it is formed of a chemical resistant liquid, for example, PTFE (polytetrafluoroethylene).
A plurality of through holes 21a and 22a are formed in the resin container 21 and the silicon plate member 22, and when the silicon raw material storage container 20 is immersed in the acid cleaning tank 1, the through holes are formed. The silicon raw material S is cleaned by the cleaning liquid that has entered the container 20 from 21a and 22a.
実施例1、比較例1の結果を図4のグラフに示す。
図4のグラフにおいて横軸は固化率、縦軸は炭素濃度(E16atoms/cm3)である。
図4のグラフに示すように、シリコン単結晶中の炭素濃度は、比較例1(実線で示す)に対し実施例1(破線で示す)では40%低減したことが確認できた。
具体的には、ネック部形成以降では、炭素汚染が無いと仮定した場合の、初期融液中の炭素濃度に換算すると、比較例1では、5E15atoms/cm3に対し、実施例1では、3E15atoms/cm3となり、シリコン原料に付着する炭素異物を低減することにより、2E15atoms/cm3の炭素汚染を抑制することができた。
The results of Example 1 and Comparative Example 1 are shown in the graph of FIG.
In the graph of FIG. 4, the horizontal axis is the solidification rate and the vertical axis is the carbon concentration (E16atoms / cm 3 ).
As shown in the graph of FIG. 4, it was confirmed that the carbon concentration in the silicon single crystal was reduced by 40% in Example 1 (indicated by the broken line ) as compared with Comparative Example 1 (indicated by the solid line ).
Specifically, when converted to the carbon concentration in the initial melt assuming that there is no carbon contamination after the neck portion is formed, it is 5E15atoms / cm3 in Comparative Example 1 and 3E15atoms in Example 1. By reducing the amount of carbon foreign matter adhering to the silicon raw material to / cm3 , it was possible to suppress carbon contamination at 2E15atoms / cm3 .
シリコン単結晶の抵抗率の目標値は100Ωcm以下に設定することが多い。そのため、シリコン製板部材の抵抗率を少なくとも1000Ωcmに形成することにより(即ち、ドーパント濃度を、抵抗率が100Ωcmのときのドーパント濃度よりも低くすることにより)、シリコン製板材から発生する欠片が混入した場合でも、シリコン単結晶製品の目標とする抵抗率への影響を小さく抑えることができる。
例えば、シリコン製板部材の抵抗率を少なくとも1000Ωcmに形成した場合、30kgのシリコン原料を洗浄処理中にシリコン製板部材が欠損して仮に3kg(10分の1の量)が混入してもシリコン単結晶の濃度の変化を10%以下に抑えることができる。
The target value of the resistivity of a silicon single crystal is often set to 100 Ωcm or less. Therefore, by forming the resistivity of the silicon plate member to at least 1000 Ωcm (that is, by making the dopant concentration lower than the dopant concentration when the resistivity is 100 Ωcm) , fragments generated from the silicon plate material are mixed. Even in this case, the influence on the target resistivity of the silicon single crystal product can be suppressed to a small extent.
For example, when the resistivity of the silicon plate member is formed to be at least 1000 Ωcm, even if the silicon plate member is damaged during the cleaning process of 30 kg of silicon raw material and 3 kg (1/10 amount) is mixed, silicon is mixed. The change in the concentration of the single crystal can be suppressed to 10% or less.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020042895A JP7458833B2 (en) | 2020-03-12 | 2020-03-12 | Silicon raw material cleaning equipment |
PCT/JP2021/008778 WO2021182341A1 (en) | 2020-03-12 | 2021-03-05 | Device for cleaning silicon raw material |
TW110108806A TWI778543B (en) | 2020-03-12 | 2021-03-12 | Silicon raw material cleaning device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020042895A JP7458833B2 (en) | 2020-03-12 | 2020-03-12 | Silicon raw material cleaning equipment |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2021143091A JP2021143091A (en) | 2021-09-24 |
JP2021143091A5 true JP2021143091A5 (en) | 2022-02-18 |
JP7458833B2 JP7458833B2 (en) | 2024-04-01 |
Family
ID=77671734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2020042895A Active JP7458833B2 (en) | 2020-03-12 | 2020-03-12 | Silicon raw material cleaning equipment |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP7458833B2 (en) |
TW (1) | TWI778543B (en) |
WO (1) | WO2021182341A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114890429A (en) * | 2022-05-18 | 2022-08-12 | 江苏新效新材料科技有限公司 | Purification method for removing resin impurities from solar silicon wafer cutting waste residues |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5445679A (en) * | 1992-12-23 | 1995-08-29 | Memc Electronic Materials, Inc. | Cleaning of polycrystalline silicon for charging into a Czochralski growing process |
JP4686824B2 (en) * | 2000-07-28 | 2011-05-25 | Jfeスチール株式会社 | Method and apparatus for removing quartz adhering to silicon |
JP3723502B2 (en) | 2001-01-25 | 2005-12-07 | 住友チタニウム株式会社 | Cleaning method of polycrystalline silicon for semiconductor |
DE10204176A1 (en) * | 2002-02-01 | 2003-08-14 | Wacker Chemie Gmbh | Device and method for the automatic, low-contamination packaging of broken polysilicon |
JP5494360B2 (en) * | 2009-08-31 | 2014-05-14 | 三菱マテリアル株式会社 | Cleaning device for polycrystalline silicon lump |
JP6184906B2 (en) * | 2014-06-20 | 2017-08-23 | 信越化学工業株式会社 | Cleaning method for polycrystalline silicon lump |
US11428685B2 (en) | 2016-12-16 | 2022-08-30 | Tokuyama Corporation | Method of analyzing resins adhering to crushed polysilicon |
-
2020
- 2020-03-12 JP JP2020042895A patent/JP7458833B2/en active Active
-
2021
- 2021-03-05 WO PCT/JP2021/008778 patent/WO2021182341A1/en active Application Filing
- 2021-03-12 TW TW110108806A patent/TWI778543B/en active
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