WO2012164803A1 - 多結晶シリコン棒の選択方法および単結晶シリコンの製造方法 - Google Patents
多結晶シリコン棒の選択方法および単結晶シリコンの製造方法 Download PDFInfo
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- WO2012164803A1 WO2012164803A1 PCT/JP2012/002361 JP2012002361W WO2012164803A1 WO 2012164803 A1 WO2012164803 A1 WO 2012164803A1 JP 2012002361 W JP2012002361 W JP 2012002361W WO 2012164803 A1 WO2012164803 A1 WO 2012164803A1
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- polycrystalline 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
- C30B13/00—Single-crystal growth by zone-melting; Refining by zone-melting
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C30B35/007—Apparatus for preparing, pre-treating the source material to be used for crystal growth
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/207—Diffractometry using detectors, e.g. using a probe in a central position and one or more displaceable detectors in circumferential positions
Definitions
- the present invention relates to a method for selecting polycrystalline silicon rods used as a raw material for producing single crystal silicon, and more specifically, to non-oriented polycrystalline silicon rods suitable for stably producing single crystal silicon. Regards how to choose.
- Single crystal silicon which is essential for the production of semiconductor devices and the like, is crystal-grown by the CZ method or FZ method, and a polycrystalline silicon rod or a polycrystalline silicon block is used as a raw material at that time.
- Such polycrystalline silicon materials are often manufactured by the Siemens method (see Patent Document 1 etc.).
- the Siemens method refers to vapor phase growth (deposition) of polycrystalline silicon on the surface of a silicon core wire by bringing a silane source gas such as trichlorosilane or monosilane into contact with the heated silicon core wire by CVD (Chemical Vapor Deposition) method. It is a way to
- a polycrystalline silicon block is charged in a quartz crucible, and a seed crystal is dipped in a silicon melt obtained by heat melting this to eliminate dislocation lines and cause no After the dislocation, the crystal is pulled by gradually enlarging the diameter until it reaches a predetermined diameter. At this time, if unmelted polycrystalline silicon remains in the silicon melt, this unmelted polycrystalline piece floats in the vicinity of the solid-liquid interface by convection, causing the occurrence of dislocations and causing the crystal lines to disappear. It becomes a cause.
- the present inventors are studying the quality improvement of polycrystalline silicon in order to stably manufacture single crystal silicon, and according to various conditions at the time of polycrystalline silicon deposition, the crystal grains in the polycrystalline silicon rod We have obtained the finding that differences occur in the randomness of orientation. Unlike single crystal silicon, a block of polycrystalline silicon contains many crystal grains, but it is likely that these many crystal grains are randomly oriented. However, according to the study by the present inventors, the crystal grains contained in the polycrystalline silicon block are not always completely randomly oriented.
- the present inventors took a plate-like sample whose main surface is a cross section perpendicular to the long axis direction from many different polycrystalline silicon rods grown by deposition by the chemical vapor deposition method, According to the result of X-ray diffraction measurement in all directions in the inside, any of X-ray diffraction peaks from crystal planes of Miller indices of ⁇ 111>, ⁇ 220>, ⁇ 311>, and ⁇ 400> It has been found that the diffraction intensity may have a noticeable dependence on the direction of incidence of the X-rays.
- Such remarkable X-ray incident direction dependence means that the crystal grains contained in the polycrystalline silicon block are not randomly oriented, and the crystal grains are easily aligned in the direction of the crystal plane of a specific Miller index. There is.
- the present invention was made based on the new finding that the randomness of the orientation of crystal grains in polycrystalline silicon is caused by the various conditions at the time of deposition when growing polycrystalline silicon rods by the chemical vapor deposition method.
- An object of the present invention is to provide a highly randomly oriented polycrystalline silicon material, that is, a non-oriented polycrystalline silicon rod and a polycrystalline silicon block, and to contribute to stable production of single crystal silicon.
- the method for selecting polycrystalline silicon rods according to the present invention is a method for selecting polycrystalline silicon rods used as a raw material for producing single crystal silicon, wherein the polycrystalline silicon rods are chemically A plate-like sample which is grown by deposition by a vapor phase method and whose main surface is a cross section perpendicular to the long axis direction of the polycrystalline silicon rod is taken, and X in all directions in the plane of the plate-like sample.
- the polycrystalline silicon rod selected in this manner or the polycrystalline silicon block obtained by grinding the same is obtained for any of Miller indices of ⁇ 111>, ⁇ 220>, ⁇ 311>, and ⁇ 400>.
- the crystal growth is performed by the FZ method using the polycrystalline silicon rod according to the present invention, or the crystal growth is performed by the CZ method using the polycrystalline silicon block obtained by crushing, and thus the local remaining of the partial melting residue The occurrence is suppressed, which can contribute to the stable production of single crystal silicon.
- FIGS. 1A and 1B are diagrams for explaining an example of extraction of a plate-like sample 20 for X-ray diffraction profile measurement from a polycrystalline silicon rod 10 grown by precipitation by a chemical vapor deposition method such as Siemens. It is.
- reference numeral 1 denotes a silicon core wire for depositing polycrystalline silicon on the surface to form a silicon rod.
- CTR a portion close to the silicon core wire 1
- EDG a portion close to the side surface of the polycrystalline silicon rod 10 to confirm presence or absence of non-orientation radial direction dependency of the polycrystalline silicon rod R / 2:
- a plate-like sample 20 is taken from a site between CTR and EGD), but it is not limited to the taking from such a site.
- the diameter of the polycrystalline silicon rod 10 illustrated in FIG. 1A is approximately 120 mm, and three portions from the side of the polycrystalline silicon rod 10 to the silicon core 1 side (CTR: a portion near the silicon core 1, EDG: many A rod 11 having a diameter of approximately 10 mm and a length of approximately 60 mm is cut out parallel to the silicon core wire 10 from a portion close to the side surface of the crystalline silicon rod 10, R / 2: a portion between CTR and EGD). Then, as illustrated in FIG. 1B, a plate-like sample 20 having a main surface that is a cross section perpendicular to the long axis direction of these rods 11 is collected with a thickness of approximately 2 mm.
- part which picks up the rod 11 expresses property of the whole silicon rod 10 well when it is said three site
- the method of collecting the plate-like sample 20 is also not particularly limited.
- a plate-like sample 12 with a thickness of approximately 2 mm having a main surface perpendicular to the long axis direction of the polycrystalline silicon rod 10 is taken, and a portion near the silicon core 1 of this plate-like sample 12 (
- a plate-like sample 20 having a diameter of approximately 10 mm may be taken from CTR), a portion (EDG) close to the side surface of polycrystalline silicon rod 10, and a portion (R / 2) between CTR and EGD ( Figure 1D).
- the diameter of the plate-like sample 20 is merely an example, and the diameter may be appropriately determined within a range that does not cause any problem in X-ray diffraction measurement.
- FIG. 2 is a view for explaining the X-ray diffraction measurement from the plate-like sample 20 collected in this manner.
- the collimated X-ray beam 40 emitted from the slit 30 enters the plate-like sample 20, and the intensity of the diffracted X-ray beam for each sample rotation angle ( ⁇ ) in the XY plane is detected by a detector (not shown) Thus, an X-ray diffraction chart is obtained.
- Such profile measurement is performed by rotating the plate-like sample 20 little by little in the YZ plane, and a profile is obtained for each rotation angle ( ⁇ ) in the YZ plane.
- a sample obtained by pulverizing polycrystalline silicon into a powder can be treated as completely randomly oriented, and an X-ray diffraction chart obtained from such a powder sample is, for example, as shown in FIG. This chart does not change substantially with any rotation of the sample relative to the incident x-rays. And, in the radar chart obtained by plotting the rotation angle ⁇ dependency of the diffraction intensity, any mirror surface index is substantially a true circle.
- plate-like samples 20 are taken from three parts by the collection method shown in FIGS. 1C and 1D, all three plate-like samples 20CTR, 20R / 2, and 20EDG are in-plane omnidirectional X-ray diffraction measurement is performed, and the polycrystalline silicon rod is selected as a raw material for producing single crystal silicon when there is no sample which does not satisfy the determination criteria.
- Non-oriented polycrystalline silicon showing no X-ray diffraction peak having a diffraction intensity deviating from an average value ⁇ 2 standard deviation ( ⁇ ⁇ 2 ⁇ ), which is a method of producing single crystal silicon according to the present invention Is used as a raw material for producing single crystal silicon.
- Partial crystal growth by crystal growth by the FZ method using the above non-oriented polycrystalline silicon rod or CZ method using the non-oriented polycrystalline silicon mass obtained by crushing Localized generation of the unmelted portion can be suppressed, which can contribute to stable production of single crystal silicon.
- Table 1 shows, for each of the eight polycrystalline silicon rods grown by deposition by the chemical vapor phase method, the above-mentioned for 20 CTR out of three plate-like samples collected by the method shown in FIG. 1C and FIG. 1D.
- ⁇ ⁇ 2 ⁇ standard deviations
- FIG. 4A shows an example of an X-ray diffraction profile obtained from sample A (ie, plate-like sample 20CTR taken from polycrystalline silicon rod A), and FIG. 4B shows the rotation angle ⁇ of the sample A and the diffraction intensity cps It is a radar chart created.
- sample A ie, plate-like sample 20CTR taken from polycrystalline silicon rod A
- FIG. 4B shows the rotation angle ⁇ of the sample A and the diffraction intensity cps It is a radar chart created.
- the diffraction intensity from the lattice plane of any of the mirror indexes of ⁇ 111>, ⁇ 220>, ⁇ 311>, and ⁇ 400> of this sample A also shows a shape close to a perfect circle, and ⁇ 111>, No X-ray diffraction peak deviating from the mean value ⁇ 2 standard deviations ( ⁇ ⁇ 2 ⁇ ) does not appear for any of Miller indices of 220>, ⁇ 311>, and ⁇ 400>.
- FIG. 5B is a radar chart created from the rotation angle ⁇ of the sample h and the diffraction intensity cps.
- the diffraction intensity from the lattice plane of any of ⁇ 111>, ⁇ 220>, and ⁇ 311> mirror index of this sample h also shows a shape close to a perfect circle, and ⁇ 111>, ⁇ 220>, and For any Miller index of ⁇ 311>, X-ray diffraction peaks deviating from the mean value ⁇ 2 standard deviations ( ⁇ ⁇ 2 ⁇ ) do not appear.
- FIG. 6B is a radar chart created from the rotation angle ⁇ of the sample g and the diffraction intensity cps.
- the diffraction intensity from the lattice plane of any ⁇ 400>, ⁇ 220>, and ⁇ 311> mirror index of this sample g shows a shape close to a perfect circle
- ⁇ 400> In any of Miller indices of ⁇ 220> and ⁇ 311>, X-ray diffraction peaks deviating from the mean value ⁇ 2 standard deviations ( ⁇ ⁇ 2 ⁇ ) do not appear.
- non-oriented polycrystalline silicon rods examples and the “oriented” polycrystalline silicon rods (comparative examples) are classified according to the procedure as described above, and each polycrystalline silicon rod is used as a raw material by the FZ method.
- a manufacturing experiment of a single crystal silicon ingot was conducted to investigate the presence or absence of crystal line disappearance.
- Three polycrystalline silicon rods (non-oriented product) of the example and three polycrystalline silicon rods (oriented product) of the comparative example were respectively used, and the crystal growth conditions other than the polycrystalline silicon rods were the same. The results are summarized in Table 2.
- the present invention contributes to the stable production of single crystal silicon.
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Abstract
Description
10 多結晶シリコン棒
11 ロッド
12、20 板状試料
30 スリット
40 X線ビーム
Claims (6)
- 単結晶シリコン製造用原料として用いる多結晶シリコン棒を選択するための方法であって、
前記多結晶シリコン棒は化学気相法による析出で育成されたものであり、
該多結晶シリコン棒の長軸方向に垂直な断面を主面とする板状試料を採取し、
該板状試料の面内の全方向につきX線回折測定を行い、
<111>、<220>、<311>、及び、<400>の何れのミラー指数についても、平均値±2標準偏差(μ±2σ)から逸脱する回折強度をもつX線回折ピークが認められない多結晶シリコン棒を単結晶シリコン製造用原料として選択する、
ことを特徴とする多結晶シリコン棒の選択方法。 - 前記多結晶シリコン棒はシーメンス法で育成されたものである、請求項1に記載の方法。
- 請求項1又は2に記載の方法により選択された多結晶シリコン棒。
- 請求項3に記載の多結晶シリコン棒を破砕して得た多結晶シリコン塊。
- 請求項3に記載の多結晶シリコン棒をシリコン原料として用いる単結晶シリコンの製造方法。
- 請求項4に記載の多結晶シリコン塊を原料として用いる単結晶シリコンの製造方法。
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JP2013517819A JP5897001B2 (ja) | 2011-06-02 | 2012-04-04 | 多結晶シリコン棒の選択方法および単結晶シリコンの製造方法 |
US14/111,597 US9605356B2 (en) | 2011-06-02 | 2012-04-04 | Method for selecting polycrystalline silicon rod, and method for producing single crystalline silicon |
CN201280025081.XA CN103547713B (zh) | 2011-06-02 | 2012-04-04 | 多晶硅棒的选择方法及单晶硅的制造方法 |
EP12791960.3A EP2692909B1 (en) | 2011-06-02 | 2012-04-04 | Method for selecting polycrystalline silicon rod, and method for producing single-crystalline silicon |
KR1020137034922A KR20140034260A (ko) | 2011-06-02 | 2012-04-04 | 다결정 실리콘 봉의 선택 방법 및 단결정 실리콘의 제조 방법 |
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JP2011124439 | 2011-06-02 | ||
JP2011-124439 | 2011-06-02 |
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US (1) | US9605356B2 (ja) |
EP (1) | EP2692909B1 (ja) |
JP (1) | JP5897001B2 (ja) |
KR (1) | KR20140034260A (ja) |
CN (1) | CN103547713B (ja) |
WO (1) | WO2012164803A1 (ja) |
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WO2013150758A1 (ja) * | 2012-04-04 | 2013-10-10 | 信越化学工業株式会社 | 多結晶シリコンの結晶配向度評価方法、多結晶シリコン棒の選択方法、および単結晶シリコンの製造方法 |
WO2013190829A1 (ja) * | 2012-06-18 | 2013-12-27 | 信越化学工業株式会社 | 多結晶シリコンの結晶配向度評価方法、多結晶シリコン棒の選択方法、多結晶シリコン棒、多結晶シリコン塊、および、単結晶シリコンの製造方法 |
WO2014024388A1 (ja) * | 2012-08-10 | 2014-02-13 | 信越化学工業株式会社 | 多結晶シリコン棒の選択方法、多結晶シリコン塊の製造方法、及び、単結晶シリコンの製造方法 |
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WO2014192245A1 (ja) * | 2013-05-28 | 2014-12-04 | 信越化学工業株式会社 | 多結晶シリコン中の局所配向ドメインの評価方法 |
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WO2016103608A1 (ja) * | 2014-12-25 | 2016-06-30 | 信越化学工業株式会社 | 多結晶シリコン棒、多結晶シリコン棒の加工方法、多結晶シリコン棒の結晶評価方法、および、fz単結晶シリコンの製造方法 |
JP2016150885A (ja) * | 2015-02-19 | 2016-08-22 | 信越化学工業株式会社 | 多結晶シリコン棒とその製造方法およびfzシリコン単結晶 |
JP2017186190A (ja) * | 2016-04-04 | 2017-10-12 | 信越化学工業株式会社 | 多結晶シリコン、fz単結晶シリコン、およびその製造方法 |
DE112016003701T5 (de) | 2015-09-14 | 2018-04-26 | Shin-Etsu Chemical Co., Ltd. | Polykristalliner Siliciumstab |
CN116342613A (zh) * | 2023-06-01 | 2023-06-27 | 嘉兴视联智能科技股份有限公司 | 单晶硅棒晶线的自适应抗干扰机器视觉检测方法和系统 |
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JP6200857B2 (ja) * | 2014-06-03 | 2017-09-20 | 信越化学工業株式会社 | 多結晶シリコンロッドの製造方法、多結晶シリコンロッド、および、多結晶シリコン塊 |
KR102426015B1 (ko) * | 2015-09-24 | 2022-07-27 | 삼성디스플레이 주식회사 | 다결정 규소막 검사 장치 및 검사 방법 |
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2012
- 2012-04-04 EP EP12791960.3A patent/EP2692909B1/en not_active Not-in-force
- 2012-04-04 WO PCT/JP2012/002361 patent/WO2012164803A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
EP2692909A4 (en) | 2014-10-08 |
CN103547713A (zh) | 2014-01-29 |
US20140033966A1 (en) | 2014-02-06 |
KR20140034260A (ko) | 2014-03-19 |
JPWO2012164803A1 (ja) | 2014-07-31 |
EP2692909B1 (en) | 2016-10-19 |
JP5897001B2 (ja) | 2016-03-30 |
CN103547713B (zh) | 2016-01-20 |
US9605356B2 (en) | 2017-03-28 |
EP2692909A1 (en) | 2014-02-05 |
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