JP5025109B2 - 基板載置機構、基板処理装置、および基板載置機構の製造方法 - Google Patents
基板載置機構、基板処理装置、および基板載置機構の製造方法 Download PDFInfo
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- 239000000758 substrate Substances 0.000 title claims description 95
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000000919 ceramic Substances 0.000 claims description 53
- 238000000034 method Methods 0.000 claims description 42
- 230000002093 peripheral effect Effects 0.000 claims description 40
- 238000005245 sintering Methods 0.000 claims description 40
- 238000010438 heat treatment Methods 0.000 claims description 35
- 239000000654 additive Substances 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 17
- 230000000996 additive effect Effects 0.000 description 20
- 239000002994 raw material Substances 0.000 description 8
- 238000005192 partition Methods 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 6
- 229910010293 ceramic material Inorganic materials 0.000 description 5
- 230000008602 contraction Effects 0.000 description 5
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- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910017083 AlN Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000009766 low-temperature sintering Methods 0.000 description 2
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- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229910025794 LaB6 Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- 229910052804 chromium Inorganic materials 0.000 description 1
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- 229910052736 halogen Inorganic materials 0.000 description 1
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- 230000017525 heat dissipation Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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Description
ここでは、本発明に係るセラミック部材をCVD成膜装置の基板載置機構に適用した例について説明する。
図1は、本発明の一実施形態に係るウエハ載置機構を適用したCVD成膜装置を示す概略断面図である。このCVD成膜装置100は、気密に構成された略円筒状のチャンバー2と、チャンバー2の底壁2bから下方に突出して設けられた排気室3とを有しており、これらチャンバー2と排気室3により一体的な処理容器が構成される。チャンバー2内には被処理体である半導体ウエハ(以下、単にウエハと記す)Wを水平状態にして載置し、かつ加熱するための、ウエハ載置機構10が設けられている。このウエハ載置機構10は、ウエハ載置面を有し、セラミック部材からなる基体と、基体に埋設された発熱体とを有するウエハ載置台11と、処理容器を構成する排気室3の底部から上方に延びウエハ載置台11の中央を支持する円筒状の支持部材12とを有している。また、チャンバー2の外側にはウエハ載置台11の発熱体等に給電するための電源5が設けられており、この電源5から接続室20を介して発熱体等に給電される。電源5にはコントローラ7が接続されており、電源5からの給電量を制御してウエハ載置台11等の温度制御を行うようになっている。この制御系の詳細については後述する。さらに、ウエハ載置台11の外縁部にはウエハWをガイドするためのガイドリング6が設けられている。
上述したように、ウエハ載置機構10は、ウエハ載置台11と、ウエハ載置台11を支持する円筒状の支持部材12とを有している。ウエハ載置台11は、セラミックヒーターとして構成されており、AlN、Al2O3、SiC、SiO2等のセラミック材料からなるセラミック部材として構成される基体11aと、基体11a内に埋設された、例えばW、Mo、V、Cr、Mn、Nb、Ta等の高融点金属またはこれらの化合物からなる発熱体13とを有している。発熱体13は2ゾーンに分かれており、ウエハ載置台11の中央部分において、各ゾーンの発熱体13は、それに給電するための給電端子部14に接続されている。なお、給電端子部14は、各ゾーンの発熱体13に2つずつ設けられているが、図2では便宜上、各ゾーンの発熱体13について1つずつ合計2つのみ描いている。
成膜装置100の各構成部は、プロセスコントローラ60に接続されて制御される構成となっている。プロセスコントローラ60には、工程管理者が成膜装置100を管理するためにコマンドの入力操作等を行うキーボードや、成膜装置100の稼働状況を可視化して表示するディスプレイ等からなるユーザーインターフェイス61が接続されている。
第1の方法は、セラミック部材であるウエハ載置台11を製造する際に、中央部分と周辺部分の焼結温度に分布をつける方法である。通常、セラミック焼結体は、焼結温度により収縮率が異なるから、意図的に中央部分の焼結温度を周辺部分と異ならせることにより、中央部分に圧縮応力を発生させることが可能である。
中央部分の焼結温度<周辺部分の焼結温度
の場合、
中央部分の収縮率<周辺部分の収縮率
となるから、中央部に対して周辺部から締め付ける力が加わり、圧縮応力が発生する。
この第2の方法は、セラミック部材である基体11aの中央部分と周辺部分とで添加物(焼結助剤)の種類、量、および組成の1以上を変える方法である。通常、セラミック焼結体は、添加物(焼結助剤)の種類、量、および組成により収縮率が異ならせることができるから、意図的に中央部分と周辺部分とで焼結助剤の種類、量、組成の1以上を変えることにより、中央部に圧縮応力を発生させることが可能である。
中央部の収縮率<周辺部の収縮率
を実現することができ、中央部に対して周辺部から締め付ける力が加わり、圧縮応力が発生する。
この第3の方法は、図9に示すように、ウエハ載置台11(セラミック部材)の周辺部分(図9の(a))またはウエハ載置台11(セラミック部材)の外周部分(図9の(b))にリング状をなす張力発生エレメント82を設け、これと基体11aとの熱膨張差により基体11aに圧縮応力を付与することができる。簡便なのは、図9の(b)であるが、張力発生エレメント82が腐食しやすい場合には、図9(a)のようにウエハ載置台11の中に埋め込むことが好ましい。このような状態にするには、張力発生エレメント82として大きな塑性変形が可能な金属材料を原料に埋め込んでおいて焼結する方法、ウエハ載置台11の張力発生エレメント82の内側部分のみを先に途中まで焼結させてから張力発生エレメント82を装着し、その後外側部分の原料を装入し、全体を焼結させる方法等を採用することができる。
上述した実施形態のような熱CVDでは、基板であるウエハ温度に例えば700℃という高温が要求されるため、上述したようなセラミックヒーターとして構成されるウエハ載置台11が要求されるが、高い温度が要求されない処理、例えばプラズマ処理等を行う装置の場合は、このような高温に昇温されないため、発熱体が存在しない全体がセラミック部材で形成された図10に示すようなウエハ載置台84が用いられる。この場合には、ウエハ載置台84は積極的には加熱されないため、その中央部分にはほとんど引張応力が発生せず、中央部分で割れる危険性は小さい。この場合には、むしろウエハ支持ピンが挿通する挿通孔53aにおいて割れが発生する可能性が高くなる。つまり、ウエハ支持ピン53の挿通孔53aは加工により形成されているため破壊起点になりやすく、その部分で引張応力が発生する可能性があるので、割れが発生する可能性がある。このような場合にはウエハ支持ピンの挿通孔53aが形成されている周辺部分に圧縮応力を付与することにより、上述のような効果を得ることができる。
中央部分の収縮率>周辺部分の収縮率
となるようにする。
3;排気室
5;電源
7;コントローラ
10;ウエハ載置機構
11;ウエハ載置台
11a;基体
12;支持部材
13;発熱体
14;給電端子部
15;給電ロッド
20;接続室
60;プロセスコントローラ
100;成膜装置
W;半導体ウエハ
Claims (7)
- 基板処理装置の処理容器内において基板を載置する基板載置機構であって、
セラミック部材からなる基体と基体に設けられた発熱体とを有し、基板を載置する基板載置台と、
一端が前記基板載置台に接合され、前記処理容器内で前記基板載置台を支持する支持部材と、
前記発熱体に給電する給電部と
を具備し、
前記発熱体に給電して前記基体が加熱された際に、前記基体における、熱膨張差に起因する引張応力がかかって破壊起点となり得る部位である前記給電部および/または前記支持部材が接合される部位に、前記加熱された温度において、前記引張応力を相殺して圧縮応力が残存する程度の圧縮応力が予め付与されていることを特徴とする基板載置機構。 - 前記支持部材は前記基板載置台の中央に設けられていることを特徴とする請求項1に記載の基板載置機構。
- 基板を収容し、内部が減圧保持される処理容器と、
前記処理容器内に設けられ、前記基板が載置され、請求項1または請求項2に記載された構成を有する基板載置機構と、
前記処理容器内で基板に所定の処理を施す処理機構と
を具備することを特徴とする基板処理装置。 - セラミック部材からなる基体と基体に設けられた発熱体とを有し、基板を載置する基板載置台と、一端が前記基板載置台に接合され、前記基板載置台を支持する支持部材と、前記発熱体に給電する給電部とを具備する基板載置機構の製造方法であって、
前記セラミック部材からなる基体の製造過程で、前記発熱体に給電して前記基体が加熱された際に、前記基体における、熱膨張差に起因する引張応力がかかって破壊起点となり得る部位である前記給電部および/または前記支持部材が接合される部位に、前記加熱された温度において、前記引張応力を相殺して圧縮応力が残存する程度の圧縮応力を発生させることを特徴とする基板載置機構の製造方法。 - 前記圧縮応力は、前記破壊起点になり得る部位を含む部分と、他の部分とで温度を変えて焼結することにより発生させることを特徴とする請求項4に記載の基板載置機構の製造方法。
- 前記圧縮応力は、前記破壊起点になり得る部位を含む部分と、他の部分とで添加物の種類、量、および組成の1以上を変えて焼結することにより発生させることを特徴とする請求項4に記載の基板載置機構の製造方法。
- 前記圧縮応力は、前記セラミック部材からなる基体の周辺部分または外周部分にリング状をなす張力発生エレメントを設け、当該張力発生エレメントと前記セラミック部材からなる基体との熱膨張差により発生させることを特徴とする請求項4に記載の基板載置機構の製造方法。
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PCT/JP2006/316452 WO2007023831A1 (ja) | 2005-08-26 | 2006-08-23 | セラミック部材、セラミックヒーター、基板載置機構、基板処理装置、およびセラミック部材の製造方法 |
CN2006800009052A CN101031527B (zh) | 2005-08-26 | 2006-08-23 | 陶瓷部件及其制造方法、加热器、载置机构、处理装置 |
US12/064,908 US20090241837A1 (en) | 2005-08-26 | 2006-08-23 | Ceramic member, ceramic heater, substrate placing mechanism, substrate processing apparatus and method for manufacturing ceramic member |
TW095131382A TWI407821B (zh) | 2005-08-26 | 2006-08-25 | A substrate mounting mechanism and a substrate processing device |
KR20087004330A KR100990020B1 (ko) | 2005-08-26 | 2008-02-22 | 세라믹부재, 세라믹히터, 기판탑재기구, 기판 처리 장치,및 세라믹부재의 제조 방법 |
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CN202796877U (zh) * | 2012-04-16 | 2013-03-13 | 京东方科技集团股份有限公司 | 一种基板支撑梢 |
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