JPS63166787A - Pulling up device for silicon single crystal - Google Patents

Pulling up device for silicon single crystal

Info

Publication number
JPS63166787A
JPS63166787A JP61315579A JP31557986A JPS63166787A JP S63166787 A JPS63166787 A JP S63166787A JP 61315579 A JP61315579 A JP 61315579A JP 31557986 A JP31557986 A JP 31557986A JP S63166787 A JPS63166787 A JP S63166787A
Authority
JP
Japan
Prior art keywords
crucible
carbon
heater
single crystal
silicon
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.)
Granted
Application number
JP61315579A
Other languages
Japanese (ja)
Other versions
JPH0751472B2 (en
Inventor
Hideyasu Matsuo
松尾 秀逸
Kazuo Ito
和男 伊藤
Masayuki Saito
正行 斎藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Coorstek KK
Original Assignee
Toshiba Ceramics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Ceramics Co Ltd filed Critical Toshiba Ceramics Co Ltd
Priority to JP31557986A priority Critical patent/JPH0751472B2/en
Priority to DE19873743952 priority patent/DE3743952A1/en
Priority to KR1019870015147A priority patent/KR910009131B1/en
Publication of JPS63166787A publication Critical patent/JPS63166787A/en
Publication of JPH0751472B2 publication Critical patent/JPH0751472B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Crystals, And After-Treatments Of Crystals (AREA)

Abstract

PURPOSE:To enable prolongation life of a carbon heater on the outer periphery of a crucible for charging an Si raw material as well as production of single crystal with a low carbon concentration and hardly any occurrence of crystal defects, by providing a cylindrical shielding material made of a carbon composite material between the crucible and the carbon heater. CONSTITUTION:A crucible 5 made of quartz glass is provided in the interior of a carbon protective unit 4 fixed to the upper end of a rotating shaft 3 inserted into a chamber 1 and a cylindrical carbon heater 6 is provided on the outer periphery of the protective unit 4. A thin cylindrical gas shielding material 8 consisting of a carbon composite prepared by winding carbon fibers is provided between the protective unit 4 and the heater 6. An Si raw material in the crucible 5 is melted by the heater 6 and a seed crystal 13 is dipped in an Si melt 10 and then pulled up to pull up the aimed Si single crystal 14. In the process, since SiO gas formed by reaction of the crucible 5 with the melt 10 reacts with the shielding material 8, reaction of the SiO with the heater 6 can be prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はシリコン単結晶引上装置の改良に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in silicon single crystal pulling equipment.

〔従来の技術〕[Conventional technology]

半導体デバイスの基板として用いられるシリコン単結晶
は、主にチョクラルスキー’z(cz法)により製造さ
れている。このCZ法は、原理的には、チャンバー内に
ルツボを回転自在に支持し、このルツボにシリコン原料
を装填し、ルツボ外周に設けられたカーボンヒータでル
ツボ内のシリコン原料を溶融し、シリコン融液に上方か
ら回転自在に吊下された種結晶を浸してこれを引上げる
ことによりシリコン単結晶インゴットを引上げるもので
ある。
Silicon single crystals used as substrates for semiconductor devices are mainly manufactured by Czochralski'z (cz method). In principle, this CZ method supports a crucible rotatably in a chamber, loads silicon raw material into the crucible, melts the silicon raw material in the crucible with a carbon heater provided around the crucible, and then melts the silicon. A silicon single crystal ingot is pulled up by dipping a seed crystal, which is rotatably suspended from above, into a liquid and pulling it up.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

ところで、実用的にはルツボとしては石英ガラス製のも
のが使用されている。この石英ルツボはシリコン融液と
反応し、以下のようにSiOガスが発生する。
Incidentally, in practice, crucibles made of quartz glass are used. This quartz crucible reacts with the silicon melt, and SiO gas is generated as described below.

5i02+Si→2SiO このSiOガスは最も高温となるカーボンヒータと反応
し、以下のようにCOガスが発生する。
5i02+Si→2SiO This SiO gas reacts with the carbon heater which has the highest temperature, and CO gas is generated as shown below.

S io+2c +sic+c。S io+2c +sic+c.

この結果、カーボンヒータの寿命が短くなる。また、C
Oガスはシリコン融液中に取込まるため、シリコン単結
晶インゴット中の炭素濃度が高くなって結晶欠陥が増大
する原因となる。
As a result, the life of the carbon heater is shortened. Also, C
Since O gas is taken into the silicon melt, the carbon concentration in the silicon single crystal ingot increases, causing an increase in crystal defects.

本発明は上記問題点を解決するためになされたものであ
り、SiOガスとカーボンヒータとの反応を防止し、カ
ーボンヒータを長寿命化するとともに炭素濃度が低く結
晶欠陥の発生が少ないシリコン単結晶を製造することが
できるシリコン結晶引上装置を提供することを目的とす
る。
The present invention was made to solve the above problems, and it prevents the reaction between SiO gas and the carbon heater, extends the life of the carbon heater, and uses a silicon single crystal with low carbon concentration and few crystal defects. An object of the present invention is to provide a silicon crystal pulling apparatus that can produce silicon crystals.

〔問題点を解決するための手段〕[Means for solving problems]

本発明のシリコン単結晶引上装置は、チャンバー内にル
ツボを回転自在に支持して該ルツボ内にシリコン原料を
装填し、該ルツボ外周に設けられたヒータにより加熱し
てルツボ内のシリコン原料を溶融し、シリコン融液に上
方から回転自在に吊下された種結晶を浸してこれを引上
げることによりシリコン単結晶を引上げる装置において
、少なくともルツボとヒータとの間に、カーボン繊維を
ワインディングしたカーボン複合材からなる薄い円筒状
のガス遮蔽材を設けたことを特徴とするものである。
In the silicon single crystal pulling apparatus of the present invention, a crucible is rotatably supported in a chamber, a silicon raw material is loaded into the crucible, and the silicon raw material in the crucible is heated by a heater provided on the outer periphery of the crucible. In an apparatus for pulling a silicon single crystal by dipping a seed crystal rotatably suspended from above into a melted silicon melt and pulling it up, carbon fiber is wound at least between a crucible and a heater. It is characterized by the provision of a thin cylindrical gas shielding material made of carbon composite material.

本発明において用いられるガス遮蔽材を構成するカーボ
ン複合材は、カーボン繊維を円筒状にワインディングし
てフェノール樹脂等を含浸させてこれを硬化させ、更に
焼成することにより製造することができる。
The carbon composite material constituting the gas shielding material used in the present invention can be manufactured by winding carbon fiber into a cylindrical shape, impregnating it with phenol resin or the like, curing it, and then firing it.

〔作用〕[Effect]

上述したようなシリコン単結晶引上装置によれば、ガス
遮蔽材とSiOガスとを反応させて、SiOガスとカー
ボンヒータとの反応を防止することができ、カーボンヒ
ータを長寿命化することができる。
According to the silicon single crystal pulling apparatus as described above, it is possible to prevent the reaction between the SiO gas and the carbon heater by causing the gas shielding material to react with the SiO gas, and it is possible to extend the life of the carbon heater. can.

なお、ガス遮蔽材は繊維径の小さいカーボン繊維を用い
ることにより非常に薄くすることができるので、カーボ
ンヒータからルツボへの熱伝達を妨げることはない。し
かも、薄いガス遮蔽材は容易に高純度とすることができ
るので、シリコン単結晶中の結晶欠陥を減少させるのに
有利である。
Note that since the gas shielding material can be made very thin by using carbon fibers with a small fiber diameter, it does not impede heat transfer from the carbon heater to the crucible. Furthermore, since the thin gas shielding material can be easily made to have a high purity, it is advantageous in reducing crystal defects in silicon single crystals.

〔実施例〕〔Example〕

以下、本発明の実施例を第1図を参照して説明する。 Embodiments of the present invention will be described below with reference to FIG.

第1図において、チャンバ−1上部にはプルチャンバー
2が設けられている。チャンバー1の下部開口からは回
転軸3が挿入され、この回転軸3上端にはカーボン酸の
保護体4が固定され、内部の石英ガラス製のルツボ5を
保護している。上記保護体4の外周には円筒状のカーボ
ンヒータ6が設けられ、チャンバ−1下部から挿入され
た電極7.7に接続されている。上記保護体4とカーボ
ンヒータ6との間には、カーボン繊維をワインディング
したカーボン複合材からなる薄い円筒状のガス遮蔽材8
が設けられている。このガス遮蔽材8はカーボン繊維を
円筒状にワインディングした後、フェノール樹脂を含浸
させ、熱処理により硬化させ、更に焼成することにより
製造されたものであり、その厚さは3IIIである。ま
た、カーボンヒータ6の外周には保温筒9が設けられて
いる。
In FIG. 1, a pull chamber 2 is provided above a chamber 1. A rotating shaft 3 is inserted through the lower opening of the chamber 1, and a carbon acid protector 4 is fixed to the upper end of the rotating shaft 3 to protect a crucible 5 made of quartz glass inside. A cylindrical carbon heater 6 is provided on the outer periphery of the protector 4, and is connected to an electrode 7.7 inserted from the bottom of the chamber 1. Between the protector 4 and the carbon heater 6, a thin cylindrical gas shielding material 8 made of a carbon composite material wound with carbon fibers is provided.
is provided. This gas shielding material 8 is manufactured by winding carbon fiber into a cylindrical shape, impregnating it with phenol resin, hardening it by heat treatment, and firing it, and has a thickness of 3III. Further, a heat retaining tube 9 is provided on the outer periphery of the carbon heater 6.

このシリコン単結晶引上装置を用い、以下のようにして
シリコン単結晶インゴットの引上げが行なわれる。すな
わち、ルツボ5内に多結晶シリコン原料を装填した後、
カーボンヒーター6に通電することによりルツボ5内の
シリコン原料を溶融し、シリコン融液10にプルチャン
バー2上方から吊下された引上軸11下端のシードチャ
ック12に取付けられた種結晶13を浸し、これを引上
げることによりシリコン単結晶インゴット14を引上げ
る。
Using this silicon single crystal pulling apparatus, a silicon single crystal ingot is pulled in the following manner. That is, after loading the polycrystalline silicon raw material into the crucible 5,
The silicon raw material in the crucible 5 is melted by energizing the carbon heater 6, and the seed crystal 13 attached to the seed chuck 12 at the lower end of the pulling shaft 11 suspended from above the pull chamber 2 is immersed in the silicon melt 10. , by pulling up the silicon single crystal ingot 14.

このようなシリコン単結晶引上装置によれば、カーボン
繊維をワインディングしたカーボン複合材からなるガス
遮蔽材8と石英ガラス製のルツボ5とシリコン融液10
とが反応して発生したSiOガスとを反応させることに
より、SiOガスとカーボンヒータ6とが反応するのを
防止することができ、カーボンヒータ6を長寿命化する
ことができる。また、ガス遮蔽材8は薄いカーボン複合
体であるため、純化処理が容易で、高純度であることか
ら、シリコン単結晶中の結晶欠陥を減少させるのに有利
である。そして、ガス遮蔽材8はカーボンヒータ6に比
べてはるかに低コストで製造でき、頻繁に交換してもコ
スト上昇を招くことはないので、常に良好なシリコン単
結晶を引上ることができる。
According to such a silicon single crystal pulling apparatus, a gas shielding material 8 made of a carbon composite material wound with carbon fibers, a crucible 5 made of quartz glass, and a silicon melt 10 are used.
By reacting with the SiO gas generated by the reaction, it is possible to prevent the SiO gas from reacting with the carbon heater 6, and the life of the carbon heater 6 can be extended. Furthermore, since the gas shielding material 8 is a thin carbon composite, it can be easily purified and has high purity, which is advantageous for reducing crystal defects in silicon single crystals. Furthermore, the gas shielding material 8 can be manufactured at a much lower cost than the carbon heater 6, and even if it is replaced frequently, the cost will not increase, so that good silicon single crystals can always be pulled.

〔発明の効果〕〔Effect of the invention〕

以上詳述したように本発明のシリコン単結晶引上装置に
よれば、カーボンヒータを長寿命化するとともに、シリ
コン単結晶中の結晶欠陥を減少できる等顕著な効果を奏
するものである。
As described in detail above, the silicon single crystal pulling apparatus of the present invention has remarkable effects such as extending the life of the carbon heater and reducing crystal defects in the silicon single crystal.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の実施例におけるシリコン単結晶引上装
置の断面図である。 1・・・チャンz<−12・・・プルチャンバー、3・
・・回転軸、4・・・保護体、5・・・ルツボ、6・・
・カーボンヒータ、7・・・電極、8・・・ガス遮蔽材
、9・・・保温筒、10・・・シリコン融液、11・・
・引上軸、12・・・シードチャック、13・・・種結
晶、14・・・シリコン単結晶インゴット。 出願人代理人 弁理士 鈴江武彦 第1図
FIG. 1 is a sectional view of a silicon single crystal pulling apparatus in an embodiment of the present invention. 1...Chan z<-12...Pull chamber, 3.
... Rotating shaft, 4... Protector, 5... Crucible, 6...
・Carbon heater, 7... Electrode, 8... Gas shielding material, 9... Heat insulation cylinder, 10... Silicon melt, 11...
- Pulling shaft, 12... Seed chuck, 13... Seed crystal, 14... Silicon single crystal ingot. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

【特許請求の範囲】[Claims] チャンバー内にルツボを回転自在に支持して該ルツボ内
にシリコン原料を装填し、該ルツボ外周に設けられたヒ
ータにより加熱してルツボ内のシリコン原料を溶融し、
シリコン融液に上方から回転自在に吊下された種結晶を
浸してこれを引上げることによりシリコン単結晶を引上
げる装置において、少なくともルツボとヒータとの間に
、カーボン繊維をワインディングしたカーボン複合材か
らなる薄い円筒状のガス遮蔽材を設けたことを特徴とす
るシリコン単結晶引上装置。
A crucible is rotatably supported in a chamber, a silicon raw material is loaded into the crucible, and the silicon raw material in the crucible is heated by a heater provided on the outer periphery of the crucible, and the silicon raw material in the crucible is melted.
A carbon composite material in which carbon fibers are wound at least between a crucible and a heater in an apparatus for pulling a silicon single crystal by dipping a seed crystal rotatably suspended from above into a silicon melt and pulling it up. A silicon single crystal pulling device characterized by having a thin cylindrical gas shielding material made of.
JP31557986A 1986-12-26 1986-12-26 Silicon single crystal pulling equipment Expired - Lifetime JPH0751472B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP31557986A JPH0751472B2 (en) 1986-12-26 1986-12-26 Silicon single crystal pulling equipment
DE19873743952 DE3743952A1 (en) 1986-12-26 1987-12-23 Apparatus for pulling silicon single crystals containing a heat-insulating cylinder, and method for preparing the material of the latter
KR1019870015147A KR910009131B1 (en) 1986-12-26 1987-12-26 Silicon single crystal pull-up apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31557986A JPH0751472B2 (en) 1986-12-26 1986-12-26 Silicon single crystal pulling equipment

Publications (2)

Publication Number Publication Date
JPS63166787A true JPS63166787A (en) 1988-07-09
JPH0751472B2 JPH0751472B2 (en) 1995-06-05

Family

ID=18067046

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31557986A Expired - Lifetime JPH0751472B2 (en) 1986-12-26 1986-12-26 Silicon single crystal pulling equipment

Country Status (1)

Country Link
JP (1) JPH0751472B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5207992A (en) * 1986-12-26 1993-05-04 Toshiba Ceramics Co., Ltd. Silicon single crystal pulling-up apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5207992A (en) * 1986-12-26 1993-05-04 Toshiba Ceramics Co., Ltd. Silicon single crystal pulling-up apparatus

Also Published As

Publication number Publication date
JPH0751472B2 (en) 1995-06-05

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