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JP2004039743A - Substrate processing equipment - Google Patents

Substrate processing equipment Download PDF

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Publication number
JP2004039743A
JP2004039743A JP2002192361A JP2002192361A JP2004039743A JP 2004039743 A JP2004039743 A JP 2004039743A JP 2002192361 A JP2002192361 A JP 2002192361A JP 2002192361 A JP2002192361 A JP 2002192361A JP 2004039743 A JP2004039743 A JP 2004039743A
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Prior art keywords
reaction chamber
temperature
film thickness
wall
deposited
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JP2002192361A
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Japanese (ja)
Inventor
Satoshi Takano
高野  智
Hiroyuki Takadera
高寺 浩之
Ikuhiro Maeda
前田 育寛
Yukiari Hirochi
広地 志有
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Kokusai Denki Electric Inc
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Hitachi Kokusai Electric Inc
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Priority to JP2002192361A priority Critical patent/JP2004039743A/en
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Abstract

【課題】反応室内壁に付着・堆積する膜厚量の情報をリアルタイムに測定し、クリーニング時期の検出を容易、かつ的確に行える手段を提供する。
【解決手段】ウエハ(基板)2a、2bを反応室1内に収容した状態で所望のガスを供給し、所望の処理を行う基板処理装置において、反応室1内の所定部位の温度を監視する温度測定手段(温度計測用熱電対11)と、温度測定手段から得た温度情報に基づき、反応室1内の所定部位に堆積した付着物の膜厚量を検出する制御部とを、備えた基板処理装置とするものであって、反応室1の内壁に付着・堆積した膜厚量に起因する反応室の壁温度の変化量を測定し、壁温度の変化量から反応室1内に付着・堆積した付着物の膜厚量を求め、この膜厚量と、あらかじめ設定された膜厚量の限界値とを比較して、膜厚量が膜厚量の限界値に到達した時点を反応室のクリーニング時期とする。
【選択図】図1
An object of the present invention is to provide a means for measuring, in real time, information on the amount of film thickness adhering / depositing on the inner wall of a reaction chamber to easily and accurately detect a cleaning time.
Kind Code: A1 In a substrate processing apparatus which supplies a desired gas while a wafer (substrate) 2a, 2b is accommodated in a reaction chamber 1 and performs a desired process, a temperature of a predetermined portion in the reaction chamber 1 is monitored. A temperature measuring means (thermocouple for temperature measurement 11); and a control unit for detecting a film thickness of the deposit deposited on a predetermined portion in the reaction chamber 1 based on temperature information obtained from the temperature measuring means. A substrate processing apparatus, which measures a change in the wall temperature of the reaction chamber due to the thickness of the film deposited and deposited on the inner wall of the reaction chamber 1 and adheres to the inside of the reaction chamber 1 based on the change in the wall temperature. -Calculate the film thickness of the deposited material, compare this film thickness with the preset limit of the film thickness, and react when the film thickness reaches the film thickness limit. It is time to clean the room.
[Selection diagram] Fig. 1

Description

【0001】
【発明の属する技術分野】
本発明は半導体薄膜の気相成長等を行う基板処理装置に関する。
【0002】
【従来の技術】
従来、半導体薄膜等の気相成長を行う反応室(処理室)において、基板(ウエハ)以外の反応室の内壁等に付着した薄膜や中間生成物、あるいは二次副生成物等の膜を除去して、ウエハ処理時のパーティクルの発生等による汚染を防止するクリーニング(清掃)時期の検出法として、あらかじめ、それぞれの成膜シーケンスごとに、基板および反応室の内壁に堆積する膜厚量を実験により求め、それぞれの成膜シーケンスの実行回数と各シーケンスごとの堆積膜厚量の積により、反応室の内壁の積算膜厚量(膜厚合計量)を求め、この積算膜厚量と、あらかじめ決められているクリーニングを必要とする積算膜厚量の閾値(積算膜厚の限界値)との比較を行い、反応室のクリーニング時期の判定を行っている。
【0003】
【発明が解決しようとする課題】
上述した反応室の内壁の積算膜厚量の情報は、反応室のクリーニング時期の判定と、反応室のクリーニング作業時間の算定にも利用されている。従来、基板への堆積膜厚は反応室内壁の堆積膜厚とほぼ等しいと解釈されている場合が多く、反応室の内壁の積算膜厚の管理はオペレータ自身が行うか、あるいは膜厚の積算装置で制御することにより行われている。
【0004】
しかしながら、上記反応室の堆積膜厚の管理方法では、用いる成膜シーケンスすべての堆積膜厚量の情報(データ)を事前に取得しておかねばならず、その管理方法を実施するまでには多大のデータ収集と処理時間を必要とするなど問題がある。
【0005】
これまでに、反応室のクリーニング時期の検出法として、反応室内の温度やガス成分の状態変化の情報を基に判定する方法が、いくつか提案されているが、反応室内の堆積膜厚の情報を即時に検出する方法がなく、堆積膜厚の情報をリアルタイムで検出できる方法が望まれている。
【0006】
本発明の目的は、上記従来技術における問題点を解消するものであって、反応室内壁に付着・堆積する膜厚量の情報をリアルタイムに測定し、クリーニング時期の検出を正確に行うことができる基板処理装置を提供することにある。
【0007】
【課題を解決するための手段】
上記目的を達成するため、本発明は特許請求の範囲に記載のような構成とするものである。すなわち、
請求項1に記載のように、基板を反応室内に収容した状態で所望のガスを供給し、所望の処理を行う基板処理装置において、
上記反応室内の所定部位の温度を監視する温度測定手段と、
上記温度測定手段から得た温度情報に基づき、上記反応室内の所定部位に付着した堆積物の膜厚量を検出する制御部とを、備えた基板処理装置とするものである。
【0008】
【発明の実施の形態】
以下に本発明の実施の形態の一例を挙げ、図面を用いて詳細に説明する。
本発明の基板処理装置は、例えば図1に示す2枚葉処理装置を用い、ウエハ(基板)2a、2bを反応室(処理室)1内に収容した状態で、所望のガスを反応ガス供給管6a、7aから供給し、所望の処理、例えば所望の膜の成長を行う基板処理装置において、上記反応室1内の所定部位(反応室1内で膜堆積が最も多い部位である反応室1のほぼ中央部の反応室外壁部)の温度を監視する温度測定手段(温度計測用熱電対11等)と、上記温度測定手段から得られた温度情報に基づき、上記反応室1内の所定部位に堆積した付着物の膜厚量を検出する制御部とを、備えた基板処理装置とするものである。
【0009】
本発明の基板処理装置(半導体製造装置)の反応室(処理室)のクリーニング時期の検出法は、反応室の全体および反応室の一部に、基板と同等の成膜もしくは成膜ガスに起因した中間生成物および二次副生成物の膜が付着・堆積する反応室において、上記反応室の内壁に付着・堆積した膜厚量に起因する反応室の壁温度の変化量を測定し、上記壁温度の変化量から反応室1内に付着・堆積した付着物の膜厚量を求め、上記膜厚量と、あらかじめ設定された膜厚量の限界値(これ以上膜厚量が増加するとパーティクル等の汚染物質が発生しやすくなる限界値)とを比較して、上記膜厚量が上記膜厚量の限界値に到達した時点を反応室のクリーニング時期とするものである。
【0010】
ここで、図1に示す成膜処理を行う基板処理装置の反応室の構造について説明する。これは、ウエハ2a、2bを一度に処理(薄膜形成処理)する反応室1を有する基板処理装置である。反応室1は横断面が矩形となった石英製の反応管3を有し、その外側には反応管3を加熱するための上段ヒータ4と下段ヒータ5が配置されている。反応管3の両端には、それぞれ反応ガス供給管6a、7aが設けられ、反応処理後の排気ガスを外部に排出するために排気管6b、7bがそれぞれ設けられている。なお、反応ガスを反応ガス供給管6aから供給した場合は、排気管6bから排出し、反応ガスを反応ガス供給管7aから供給した場合は、排気管7bから排出するよう構成されている。
【0011】
反応管3内には、2枚のウエハ2a、2bをそれぞれ水平状態として相互に所定の間隔を隔てて保持するために、ウエハ保持具8a、8bが設置されている。薄膜形成処理前のウエハ2a、2bをウエハ保持具8a、8bに載置すると共に、処理後に反応管3内から搬出するために、反応管3に対してその一端部からウエハ搬送アーム9a、9bが進退自在となっている。反応管3の一端部にはウエハ搬送アーム9a、9bが進退移動する際に反応管3を開くためのゲートバルブ10が開閉自在に設けられている。
【0012】
図2は、上記図1に示す構造の反応室壁温度(℃)と反応室内積算膜厚(任意単位、例えばμm)との関係を模式的に示すグラフである。反応室壁温度は反応室内積算膜厚の増加に伴い、ほぼリニアに増加し、両者の間には相関があることが分かる。そこで、あらかじめ堆積膜に応じた反応室内の積算膜厚の増加量と反応室壁温度の上昇量との関係を求め、初期反応室壁温度と反応室壁温度上昇量のモニタ値を管理することで、反応室内の積算膜厚リミットを検出(クリーニング時期の検出)することができる。
【0013】
上記反応室(処理室)1において、成膜処理に伴いウエハ2a、2bと同様に薄膜が形成される反応室外壁部に温度計測手段11を設け、図2に示すように、反応室壁温度(℃)と反応室内積算膜厚(任意単位)との関係を求めると、反応室壁温度Tに基づき、反応室内積算膜厚tを検出することができる。また、反応室内積算膜厚に応じた反応室壁温度変化量(反応室壁温度T−初期反応室壁温度T=反応室壁温度上昇量ΔT)を測定し、その反応室壁温度変化量(上昇量)ΔTが、規定する反応室内積算膜厚リミットtに対応する反応室壁温度上昇量リミットΔTとなれば、反応室内に堆積、付着した膜等の汚染物質の除去を目的とするクリーニング時期であると判定することができる。
反応室壁の温度計測部位としては、積算膜厚リミットtの検出を容易にするため、堆積した膜による温度変化量が最も大きくなる反応室内で膜堆積が最も多い部位に配置することが望ましい。本発明の実施の形態においては、図1に示すように石英製の反応管3のほぼ中心部に温度計測用熱電対11を配置して反応室壁の温度計測を行った。
【0014】
図1に示した2枚葉処理装置において、反応ガスとして、SiH、Si、SiHCl、PH、B、GeH等を用い、ドープトポリシリコン(doped polysilicon)を成膜した場合、図2に示す反応室壁温度と反応室内積算膜厚との関係は、初期反応室壁温度Tを約625℃、反応室内積算膜厚リミットtを約10μmとした時、反応室壁温度リミットTは約630℃を示し、反応室壁温度変化量(上昇量)リミットΔTは約5℃となる。そして、〔反応室壁温度変化量(上昇量)〕ΔT=ΔT〔反応室壁温度変化量(上昇量)リミット〕の時、反応室のクリーニング時期が到来したことを意味するものであり、ΔTを測定するだけでクリーニング時期を容易に検出することができる。なお、本実施の形態ではポリシリコンの成膜において具体的数値を用いて説明したが、上記の依存度を明らかにすることにより、SiH、SiHCl、NH等を用いた、Si膜等の種々の成膜プロセスに適用可能であることは言うまでもない。
【0015】
図3に、他の実施の形態として、半導体製造装置であるコールドウォール(COLD WALL)枚葉処理装置に用いられるヒータユニットの構造を模式的に示す。図3において、15はヒータユニット、16はヒータ、17は反射板、18はヒータユニット支持台、19はヒータ電極、20はヒータユニット支柱、21は反射板支柱、22はヒータ用支柱、23は石英ロッド、24はヒータユニット側面の温度監視用石英ロッド、25はウエハである。
【0016】
この枚葉処理装置用のヒータユニット15の構造上の特徴は、ヒータユニット15の内部に、例えば図3に示すヒータユニット15側面の温度監視用石英ロッド24を設け、ヒータユニット15の内部の温度を監視することで、反応室の成膜圧力において、成膜に使用する原料ガスがヒータユニットの側面にて再液化(凝縮)しているか、または、ヒータユニットの側面にて、上記原料ガスの反応生成物等が生成されているかを監視しているものであり、上記ヒータユニットの側面にパーティクル等のウエハ汚染物質が生じない温度範囲か否かを監視するものである。なお、上記ヒータユニット15側面の温度監視用石英ロッド24は、一箇所設けた場合について図示しているが、上記石英ロッドは複数箇所設置しても良い。
【0017】
上記枚葉処理装置のヒータユニット15を用いて、例えば、酸化ルテニウム(RuO)膜を成膜する場合は、原料ガスとして、ビス(エチルシクロペンタジエニル)ルテニウム〔Ru(C〕を用い、また、酸化タンタル(Ta)膜を成膜する場合は原料ガスとして、ペンタエトキシタンタル〔Ta(OC〕を用い、減圧CVD法で成膜している。
【0018】
この場合、図4に示すように、反応室の圧力は100〜200Paで、上記ヒータユニット側面の温度が約120℃以下になると、上記ヒータユニット側面において上記原料ガスが凝縮し、再液化した物質がヒータユニット側面に付着物として形成される。また、300℃以上となると、ヒータユニット側面に上記原料ガスの反応物質が付着し、ウエハ処理時にパーティクルとして発生しウエハ汚染の原因となっている。
【0019】
それで、図3に示すごとく、ヒータユニット15に、ヒータユニット側面の温度監視用石英ロッド24を設け、ヒータユニット15側面の温度を、上記原料ガス等の凝縮物質や反応物質が付着しない温度範囲である120℃を超え、300℃未満の温度範囲に入っているかを監視することにより、ウエハ処理時の汚染物質となる上記凝縮物質や反応物質の付着を防止することができる。
【0020】
また、上記原料ガスは、100〜200Paの圧力で、120℃以下になると再液化することが分かっているため、例えば、常に150℃を基準にして温度を監視モニタしても良い。なお、ヒータユニット側面の温度を監視するのみではなく、ヒータユニット側面の温度が上述した120℃〜300℃の範囲に入るように、ヒータユニット側面の温度を制御しても良い。この場合、ヒータ16とは別に、ヒータユニット側面を専用に加熱するヒータを設けても良い。
【0021】
上述においては、原料ガスとして、ビス(エチルシクロペンタジエニル)ルテニウム〔Ru(C〕と、ペンタエトキシタンタル〔Ta(OC〕の場合について述べたが、これ以外の原料ガスを用いる場合についても、設定された任意の圧力で、再液化する温度を超え、反応物質が生成する温度未満の温度範囲に入っているかを監視すれば、本発明と同様の効果が得られることは言うまでもない。
【0022】
【発明の効果】
本発明の基板処理装置によれば、あらかじめ堆積膜に応じた反応室内の積算膜厚増加量と反応室壁温度上昇量(変化量)の関係を求め、初期反応室壁温度と反応室壁温度上昇量(変化量)のモニタ値を管理することで、反応室内の積算膜厚リミットの検出(クリーニング時期の検出)をリアルタイムに検出することが可能となり、反応室のクリーニング等を的確に行うことができるので、基板(ウエハ)処理時の汚染物質の発生を防止することができる。
【図面の簡単な説明】
【図1】本発明の実施の形態で例示した基板処理装置の反応室の構成を示す模式図。
【図2】本発明の実施の形態で例示した反応室壁温度と反応室内積算膜厚との関係を示す図。
【図3】枚葉処理装置のヒータユニットの構成を示す模式図。
【図4】図3に示したヒータユニットへの付着物質と温度の関係を示す図。
【符号の説明】
1…反応室(処理室)
2a…ウエハ(基板)
2b…ウエハ(基板)
3…反応管
4…上段ヒータ
5…下段ヒータ
6a…反応ガス供給管
6b…排気管
7a…反応ガス供給管
7b…排気管
8a…ウエハ保持具
8b…ウエハ保持具
9a…ウエハ搬送アーム
9b…ウエハ搬送アーム
10…ゲートバルブ
11…温度計測用熱電対
15…ヒータユニット
16…ヒータ
17…反射板
18…ヒータユニット支持台
19…ヒータ電極
20…ヒータユニット支柱
21…反射板支柱
22…ヒータ用支柱
23…石英ロッド
24…ヒータユニット側面の温度監視用石英ロッド
25…ウエハ
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a substrate processing apparatus for performing, for example, vapor phase growth of a semiconductor thin film.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a reaction chamber (processing chamber) for performing vapor phase growth of a semiconductor thin film or the like, a film such as a thin film, an intermediate product, or a secondary by-product adhered to an inner wall of the reaction chamber other than the substrate (wafer) is removed. Then, as a method of detecting a cleaning (cleaning) time to prevent contamination due to generation of particles or the like during wafer processing, the amount of film thickness deposited on the substrate and the inner wall of the reaction chamber was previously tested for each film forming sequence. The integrated film thickness of the inner wall of the reaction chamber (total film thickness) is obtained from the product of the number of executions of each film forming sequence and the deposited film thickness for each sequence. A comparison with a predetermined threshold value of the integrated film thickness that requires cleaning (limit value of the integrated film thickness) is performed to determine the cleaning time of the reaction chamber.
[0003]
[Problems to be solved by the invention]
The information on the integrated film thickness of the inner wall of the reaction chamber described above is also used for determining the cleaning time of the reaction chamber and calculating the cleaning operation time of the reaction chamber. Conventionally, the film thickness deposited on the substrate is often interpreted as being substantially equal to the film thickness deposited on the inner wall of the reaction chamber. This is performed by controlling the apparatus.
[0004]
However, in the above-described method for controlling the deposited film thickness in the reaction chamber, it is necessary to acquire information (data) of the deposited film thickness amount in all the film forming sequences to be used in advance, and it takes a great deal of time to implement the method. It requires data collection and processing time.
[0005]
As a method of detecting the cleaning time of the reaction chamber, several methods have been proposed so far based on the information on the change in the temperature and the state of the gas components in the reaction chamber. There is no method for instantaneously detecting the thickness, and a method capable of detecting information on the deposited film thickness in real time is desired.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the related art, and it is possible to measure information on the amount of film thickness adhering / depositing on the inner wall of a reaction chamber in real time and accurately detect a cleaning time. It is to provide a substrate processing apparatus.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as described in the claims. That is,
As described in claim 1, in a substrate processing apparatus that supplies a desired gas while a substrate is accommodated in a reaction chamber and performs a desired process.
Temperature measuring means for monitoring the temperature of a predetermined portion in the reaction chamber,
A substrate processing apparatus comprising: a control unit configured to detect a film thickness of a deposit attached to a predetermined portion in the reaction chamber based on temperature information obtained from the temperature measuring unit.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
The substrate processing apparatus of the present invention uses a two-wafer processing apparatus shown in FIG. 1, for example, and supplies a desired gas to a reaction gas while the wafers (substrates) 2a and 2b are accommodated in a reaction chamber (processing chamber) 1. In a substrate processing apparatus that supplies from the tubes 6a and 7a and performs desired processing, for example, growth of a desired film, a predetermined part in the reaction chamber 1 (the reaction chamber 1 where the film deposition is the largest in the reaction chamber 1). A temperature measuring means (temperature measuring thermocouple 11 or the like) for monitoring the temperature of the outer wall of the reaction chamber substantially at the center, and a predetermined portion in the reaction chamber 1 based on the temperature information obtained from the temperature measuring means. And a controller for detecting the film thickness of the deposits deposited on the substrate.
[0009]
The method for detecting the cleaning time of a reaction chamber (processing chamber) of a substrate processing apparatus (semiconductor manufacturing apparatus) according to the present invention is based on the fact that a film equivalent to a substrate or a film forming gas is formed on the entire reaction chamber and a part of the reaction chamber. In the reaction chamber where the film of the intermediate product and the secondary by-product adhered and deposited, the amount of change in the wall temperature of the reaction chamber due to the thickness of the film deposited and deposited on the inner wall of the reaction chamber was measured. The thickness of the adhered substance deposited in the reaction chamber 1 is obtained from the change in the wall temperature, and the above-mentioned thickness and a predetermined limit value of the thickness (particles are increased if the thickness is further increased). The point at which the film thickness reaches the limit of the film thickness is defined as the cleaning time of the reaction chamber.
[0010]
Here, the structure of the reaction chamber of the substrate processing apparatus that performs the film forming process shown in FIG. 1 will be described. This is a substrate processing apparatus having a reaction chamber 1 for processing wafers 2a and 2b at a time (thin film formation processing). The reaction chamber 1 has a reaction tube 3 made of quartz and having a rectangular cross section. An outer heater 4 and a lower heater 5 for heating the reaction tube 3 are arranged outside the reaction tube 3. Reaction gas supply pipes 6a and 7a are provided at both ends of the reaction tube 3, respectively, and exhaust pipes 6b and 7b are provided respectively for discharging exhaust gas after the reaction processing to the outside. When the reaction gas is supplied from the reaction gas supply pipe 6a, the reaction gas is discharged from the exhaust pipe 6b. When the reaction gas is supplied from the reaction gas supply pipe 7a, the reaction gas is discharged from the exhaust pipe 7b.
[0011]
Wafer holders 8a and 8b are installed in the reaction tube 3 to hold the two wafers 2a and 2b in a horizontal state at a predetermined interval from each other. In order to place the wafers 2a and 2b before the thin film forming process on the wafer holders 8a and 8b, and to unload the wafer 2a from the reaction tube 3 after the process, the wafer transfer arms 9a and 9b are connected to the reaction tube 3 from one end thereof. Is free to advance and retreat. At one end of the reaction tube 3, a gate valve 10 for opening the reaction tube 3 when the wafer transfer arms 9a and 9b move forward and backward is provided so as to be openable and closable.
[0012]
FIG. 2 is a graph schematically showing the relationship between the reaction chamber wall temperature (° C.) and the integrated film thickness of the reaction chamber (arbitrary unit, for example, μm) of the structure shown in FIG. The reaction chamber wall temperature increases almost linearly with the increase in the integrated film thickness of the reaction chamber, indicating that there is a correlation between the two. Therefore, it is necessary to determine in advance the relationship between the amount of increase in the integrated film thickness in the reaction chamber and the amount of increase in the temperature of the reaction chamber wall corresponding to the deposited film, and to manage the monitor values of the initial reaction chamber wall temperature and the increase in the temperature of the reaction chamber wall temperature. Thus, the integrated film thickness limit in the reaction chamber can be detected (detection of the cleaning time).
[0013]
In the reaction chamber (processing chamber) 1, a temperature measuring means 11 is provided on an outer wall portion of the reaction chamber where a thin film is formed in the same manner as the wafers 2a and 2b in accordance with the film forming process, and as shown in FIG. When the relationship between (° C.) and the integrated film thickness in the reaction chamber (arbitrary unit) is obtained, the integrated film thickness t in the reaction chamber can be detected based on the reaction chamber wall temperature T. In addition, the amount of change in the reaction chamber wall temperature (reaction chamber wall temperature T−initial reaction chamber wall temperature T 0 = reaction chamber wall temperature rise ΔT) according to the integrated film thickness of the reaction chamber was measured, and the amount of change in the reaction chamber wall temperature was measured. When the (increase amount) ΔT becomes the reaction chamber wall temperature increase amount limit ΔT 1 corresponding to the specified reaction chamber integrated film thickness limit t 1 , the purpose is to remove contaminants such as films deposited and adhered in the reaction chamber. It can be determined that it is time to perform cleaning.
The temperature measurement portion of the reaction chamber wall, in order to facilitate detection of integration thickness limit t 1, it is desirable that the deposited film due to a temperature change amount becomes largest reaction chamber in the film deposition is disposed largest site . In the embodiment of the present invention, as shown in FIG. 1, a temperature measuring thermocouple 11 is arranged at a substantially central portion of a quartz reaction tube 3 to measure the temperature of the reaction chamber wall.
[0014]
In the two-wafer processing apparatus shown in FIG. 1, doped polysilicon is used as a reactive gas by using SiH 4 , Si 2 H 6 , SiH 2 Cl 2 , PH 3 , B 2 H 6 , GeH 4 or the like. 2), the relationship between the reaction chamber wall temperature and the integrated film thickness in the reaction chamber shown in FIG. 2 is as follows: the initial reaction chamber wall temperature T 0 is about 625 ° C., and the integrated film thickness limit t 1 in the reaction chamber is about 10 μm. when the reaction chamber wall temperature limit T 1 indicates about 630 ° C., the reaction chamber wall temperature change amount (increase amount) limit [Delta] T 1 is about 5 ° C.. Then, when [reaction chamber wall temperature change (increase)] ΔT = ΔT 1 [reaction chamber wall temperature change (increase) limit], it means that the reaction chamber cleaning time has come. The cleaning time can be easily detected only by measuring ΔT. Although the present embodiment has been described using specific numerical values in forming a polysilicon film, by clarifying the above-described dependence, SiN using SiH 4 , SiH 2 Cl 2 , NH 3, or the like can be used. It can naturally be applied to various film forming processes such as 3 N 4 film.
[0015]
FIG. 3 schematically shows a structure of a heater unit used in a cold wall (COLD WALL) single wafer processing apparatus as a semiconductor manufacturing apparatus as another embodiment. In FIG. 3, 15 is a heater unit, 16 is a heater, 17 is a reflector, 18 is a heater unit support, 19 is a heater electrode, 20 is a heater unit support, 21 is a reflector support, 22 is a heater support, and 23 is a heater support. A quartz rod, 24 is a temperature monitoring quartz rod on the side of the heater unit, and 25 is a wafer.
[0016]
A structural feature of the heater unit 15 for the single-wafer processing apparatus is that, for example, a temperature monitoring quartz rod 24 on the side surface of the heater unit 15 shown in FIG. Is monitored, the source gas used for film formation is reliquefied (condensed) on the side surface of the heater unit at the film formation pressure in the reaction chamber, or the source gas It monitors whether or not a reaction product or the like is generated, and monitors whether or not the temperature is within a temperature range in which wafer contaminants such as particles are not generated on the side surface of the heater unit. Although the temperature monitoring quartz rod 24 on the side surface of the heater unit 15 is shown as being provided at one place, the quartz rod may be provided at a plurality of places.
[0017]
For example, when a ruthenium oxide (RuO 2 ) film is formed using the heater unit 15 of the above-described single wafer processing apparatus, bis (ethylcyclopentadienyl) ruthenium [Ru (C 2 H 5 C) is used as a source gas. 5 H 4 ) 2 ], and when a tantalum oxide (Ta 2 O 5 ) film is formed, pentaethoxy tantalum [Ta (OC 2 H 5 ) 5 ] is used as a source gas and a low pressure CVD method is used. The film is formed.
[0018]
In this case, as shown in FIG. 4, when the pressure in the reaction chamber is 100 to 200 Pa and the temperature on the side of the heater unit becomes about 120 ° C. or less, the material gas condensed on the side of the heater unit and reliquefied Is formed as a deposit on the side surface of the heater unit. When the temperature exceeds 300 ° C., the reactant of the raw material gas adheres to the side surface of the heater unit and is generated as particles during wafer processing, causing wafer contamination.
[0019]
Therefore, as shown in FIG. 3, the heater unit 15 is provided with a temperature monitoring quartz rod 24 on the side of the heater unit, and the temperature on the side of the heater unit 15 is set within a temperature range in which condensed substances such as the raw material gas and reactive substances do not adhere. By monitoring whether the temperature falls within a certain temperature range of more than 120 ° C. and less than 300 ° C., it is possible to prevent the above-mentioned condensed substances and reactive substances that become contaminants during wafer processing from adhering.
[0020]
Further, since it is known that the above-mentioned raw material gas is reliquefied at a pressure of 100 to 200 Pa and a temperature of 120 ° C. or lower, the temperature may be constantly monitored and monitored based on 150 ° C., for example. In addition, the temperature of the heater unit side surface may be controlled so that the temperature of the heater unit side surface is within the above-described range of 120 ° C. to 300 ° C. in addition to monitoring the temperature of the heater unit side surface. In this case, a heater for heating the side surface of the heater unit exclusively may be provided separately from the heater 16.
[0021]
In the above, as a source gas, described for the case of a bis (the ethyl cyclopentadienyl) ruthenium [Ru (C 2 H 5 C 5 H 4) 2 ], pentaethoxytantalum [Ta (OC 2 H 5) 5] However, even in the case of using other source gases, the present invention can be implemented by monitoring whether the temperature is within a temperature range exceeding a reliquefaction temperature and a temperature lower than a temperature at which a reactant is generated at an arbitrary set pressure. Needless to say, the same effect as described above can be obtained.
[0022]
【The invention's effect】
According to the substrate processing apparatus of the present invention, the relationship between the integrated film thickness increase amount in the reaction chamber and the reaction chamber wall temperature increase amount (change amount) according to the deposited film is determined in advance, and the initial reaction chamber wall temperature and the reaction chamber wall temperature are determined. By managing the monitor value of the rise amount (change amount), detection of the accumulated film thickness limit in the reaction chamber (detection of cleaning time) can be detected in real time, and cleaning of the reaction chamber and the like can be accurately performed. Therefore, generation of contaminants during substrate (wafer) processing can be prevented.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a configuration of a reaction chamber of a substrate processing apparatus exemplified in an embodiment of the present invention.
FIG. 2 is a diagram showing a relationship between a reaction chamber wall temperature and an integrated film thickness of the reaction chamber exemplified in the embodiment of the present invention.
FIG. 3 is a schematic diagram illustrating a configuration of a heater unit of the single-wafer processing apparatus.
FIG. 4 is a diagram showing a relationship between substances attached to the heater unit shown in FIG. 3 and temperature.
[Explanation of symbols]
1. Reaction chamber (processing chamber)
2a: Wafer (substrate)
2b: Wafer (substrate)
Numeral 3: Reaction tube 4: Upper heater 5: Lower heater 6a: Reaction gas supply tube 6b: Exhaust tube 7a: Reaction gas supply tube 7b: Exhaust tube 8a: Wafer holder 8b: Wafer holder 9a: Wafer transfer arm 9b: Wafer Transfer arm 10 Gate valve 11 Temperature measurement thermocouple 15 Heater unit 16 Heater 17 Reflector 18 Heater unit support 19 Heater electrode 20 Heater unit support 21 Reflector support 22 22 Heater support 23 ... Quartz rod 24 ... Temperature monitoring quartz rod 25 on the side of heater unit 25 ... Wafer

Claims (1)

基板を反応室内に収容した状態で所望のガスを供給し、所望の処理を行う基板処理装置において、
上記反応室内の所定部位の温度を監視する温度測定手段と、
上記温度測定手段から得た温度情報に基づき、上記反応室内の所定部位に付着した堆積物の膜厚量を検出する制御部とを、備えたことを特徴とする基板処理装置。
In a substrate processing apparatus that supplies a desired gas while the substrate is accommodated in the reaction chamber and performs a desired process,
Temperature measuring means for monitoring the temperature of a predetermined portion in the reaction chamber,
A substrate processing apparatus, comprising: a controller configured to detect a film thickness of a deposit attached to a predetermined portion in the reaction chamber based on temperature information obtained from the temperature measuring unit.
JP2002192361A 2002-07-01 2002-07-01 Substrate processing equipment Pending JP2004039743A (en)

Priority Applications (1)

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Country Status (1)

Country Link
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005347447A (en) * 2004-06-02 2005-12-15 Nec Electronics Corp Processing method in vapor phase growth apparatus, forming method of thin film and manufacturing method of semiconductor apparatus
WO2008105255A1 (en) * 2007-02-27 2008-09-04 Tokyo Electron Limited Method of cleaning plasma-treating apparatus, plasma-treating apparatus where the cleaning method is practiced, and memory medium memorizing program executing the cleaning method
CN102162089A (en) * 2010-02-15 2011-08-24 东京毅力科创株式会社 Film formation method, film formation apparatus, and method for using film formation apparatus
CN103014659A (en) * 2011-09-22 2013-04-03 硅电子股份公司 Method and apparatus for depositing a layer on a semiconductor wafer by vapor deposition in a process chamber
JP2023518945A (en) * 2020-03-18 2023-05-09 アイクストロン、エスイー Method for determining end of cleaning process for process chamber of MOCVD reactor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005347447A (en) * 2004-06-02 2005-12-15 Nec Electronics Corp Processing method in vapor phase growth apparatus, forming method of thin film and manufacturing method of semiconductor apparatus
WO2008105255A1 (en) * 2007-02-27 2008-09-04 Tokyo Electron Limited Method of cleaning plasma-treating apparatus, plasma-treating apparatus where the cleaning method is practiced, and memory medium memorizing program executing the cleaning method
US8419859B2 (en) 2007-02-27 2013-04-16 Tokyo Electron Limited Method of cleaning plasma-treating apparatus, plasma-treating apparatus where the cleaning method is practiced, and memory medium memorizing program executing the cleaning method
CN102162089A (en) * 2010-02-15 2011-08-24 东京毅力科创株式会社 Film formation method, film formation apparatus, and method for using film formation apparatus
JP2011187934A (en) * 2010-02-15 2011-09-22 Tokyo Electron Ltd Film formation method, and film formation apparatus and method for using the same
CN103014659A (en) * 2011-09-22 2013-04-03 硅电子股份公司 Method and apparatus for depositing a layer on a semiconductor wafer by vapor deposition in a process chamber
US9018021B2 (en) 2011-09-22 2015-04-28 Siltronic Ag Method and apparatus for depositing a layer on a semiconductor wafer by vapor deposition in a process chamber
JP2023518945A (en) * 2020-03-18 2023-05-09 アイクストロン、エスイー Method for determining end of cleaning process for process chamber of MOCVD reactor
JP7641983B2 (en) 2020-03-18 2025-03-07 アイクストロン、エスイー Method for determining completion of a cleaning process in a process chamber of a moCVD reactor - Patents.com

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