JP5392215B2 - 成膜方法及び成膜装置 - Google Patents
成膜方法及び成膜装置 Download PDFInfo
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- JP5392215B2 JP5392215B2 JP2010217895A JP2010217895A JP5392215B2 JP 5392215 B2 JP5392215 B2 JP 5392215B2 JP 2010217895 A JP2010217895 A JP 2010217895A JP 2010217895 A JP2010217895 A JP 2010217895A JP 5392215 B2 JP5392215 B2 JP 5392215B2
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- 229910052751 metal Inorganic materials 0.000 claims description 72
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- 238000007747 plating Methods 0.000 claims description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052802 copper Inorganic materials 0.000 claims description 18
- 239000010409 thin film Substances 0.000 claims description 16
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 5
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
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- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
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- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
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- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76871—Layers specifically deposited to enhance or enable the nucleation of further layers, i.e. seed layers
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- H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
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Description
本発明は、以上のような問題点に着目し、これを有効に解決すべく創案されたものである。本発明は、ボイド等の発生を防止できるように凹部内に金属膜の成膜を施すことができる成膜方法及び成膜装置である。
また、凹部内に十分に金属の薄膜を堆積させるこができることから、その後工程に行われるメッキ法による埋め込み処理の時間を短くしたり、或いはこのメッキ処理自体を不要にすることができる。
また、凹部内に十分に金属の薄膜を堆積させるこができることから、その後工程に行われるメッキ法による埋め込み処理の時間を短くしたり、或いはこのメッキ処理自体を不要にすることができる。
真空引き可能になされた処理容器内でプラズマにより金属のターゲットをイオン化させて金属イオンを発生させ、前記金属イオンを前記処理容器内の載置台上に載置した被処理体にバイアスにより引き込んで凹部が形成されている前記被処理体に金属の薄膜を堆積させるようにした成膜方法において、線幅やホール径が小さくなっても、或いはアスペクト比が大きくなっても、下地膜形成工程、エッチング工程、成膜リフロー工程を行うことで、被処理体の表面の凹部内に十分に金属の薄膜を堆積させることが可能となり、ボイドフリーで凹部内に金属膜の成膜を施すことができる。
次に、以上のように構成されたプラズマ成膜装置の動作について図2乃至図6も参照して説明する。図2は本発明の成膜方法の第1実施例を説明するための工程図、図3は本発明の成膜方法の特徴的工程を詳しく説明するための拡大工程図、図4はバイアス電力とウエハ上面上へのCu成膜量との関係を示すグラフ、図5は成膜量の最大値Tdとエッチング量Teとの比(Te/Td)と埋め込み結果との関係を示す図、図6は比(Te/Td)が0.33以上の領域を示すグラフである。尚、図2及び図3において、図9に示す構成部分と同一構成部分については同一参照符号を付してある。
プロセス圧力:50〜200mTorrの範囲内が好ましく、65〜100mTorrがより好ましい。例えば90mTorrに設定する。
プラズマ用高周波電力:3〜6kWの範囲内が好ましく、4〜5kWがより好ましい。例えば4kWに設定する。
ターゲットへの直流電力:4〜20kWの範囲内が好ましく、8〜12kWがより好ましい。例えば10kWに設定する。
バイアス電力:25〜300Wの範囲内が好ましく、100〜200Wがより好ましい。例えば200Wに設定する。
ウエハ温度:50〜200℃の範囲内が好ましく、50〜175℃がより好ましい。例えば50℃に設定する。
プロセス圧力:0.4〜10mTorrの範囲内が好ましく、1〜2.5mTorrがより好ましい。例えば2.5mTorrに設定する。
プラズマ用高周波電力:ゼロ
ターゲットへの直流電力:ゼロ
バイアス電力:1000〜3000Wの範囲内が好ましく、2000〜2500Wがより好ましい。例えば2400Wに設定する。
ウエハ温度:25〜200℃の範囲内が好ましく、50〜100℃がより好ましい。例えば50℃に設定する。
プロセス圧力:50〜200mTorrの範囲内が好ましく、65〜100mTorrがより好ましい。例えば90mTorrに設定する。
プラズマ用高周波電力:3〜6kWの範囲内が好ましく、4〜5kWがより好ましい。例えば4kWに設定する。
ターゲットへの直流電力:2〜12kWの範囲内が好ましく、3〜6kWがより好ましい。例えば5kWに設定する。
バイアス電力:300〜1000Wの範囲内が好ましい。例えば600Wに設定する。
ウエハ温度:25〜200℃の範囲内が好ましく、50〜100℃がより好ましい。例えば80℃に設定する。
次に、上記成膜リフロー工程における凹部の埋め込み特性について実験を行ったので、その評価結果について説明する。図5は成膜量の最大値Tdとエッチング量Teとの比(Te/Td)と埋め込み結果との関係を示す図、図6は比(Te/Td)が0.33以上の領域を示すグラフである。
次に本発明の成膜方法の第2実施例について説明する。図2を参照して説明した先の第1実施例では、凹部4の特にホール4B内の側壁部分に十分な厚さの下地膜90を形成するために、下地膜形成工程(図2(C))とエッチング工程(図2(D))の2工程を行うようにしたが、上記2つの工程に替えて、成膜エッチング工程を1工程だけ行うようにしてもよい。この成膜エッチング工程では、金属イオンをバイアスにより引き込んで下地膜を形成しつつ上記下地膜をエッチングするようにしている。図8は本発明の成膜方法の第2実施例の特徴である成膜エッチング工程を説明する図である。
プロセス圧力:50〜200mTorrの範囲内が好ましく、65〜100mTorrがより好ましい。例えば90mTorrに設定する。
プラズマ用高周波電力:3〜6kWの範囲内が好ましく、4〜5kWがより好ましい。例えば4kWに設定する。
ターゲットへの直流電力:4〜20kWの範囲内が好ましく、8〜12kWがより好ましい。例えば10kWに設定する。
バイアス電力:400〜2000Wの範囲内が好ましく、400〜1200Wがより好ましい。例えば1000Wに設定する。
ウエハ温度:25〜200℃の範囲内が好ましく、25〜100℃がより好ましい。例えば50℃に設定する。
4 凹部
4A 溝
4B ホール
6 配線層
8 バリヤ層
20 成膜装置
22 処理容器
32 載置台構造
34 載置台
42 静電チャック
42A 電極
58 チャック用電源
62 バイアス用高周波電源
68 プラズマ発生源
70 誘導コイル部
72 高周波電源
76 ターゲット
78 直流電源
84 装置制御部
90 下地膜
92 本膜
W 半導体ウエハ(被処理体)
Claims (12)
- 真空引き可能になされた処理容器内でプラズマにより金属のターゲットをイオン化させて金属イオンを発生させ、前記処理容器内の載置台にバイアス電力を供給して、その載置した被処理体にバイアスを印加して、前記金属イオンを前記被処理体に引き込んで前記被処理体に形成する凹部内に金属の薄膜を堆積させるようにした成膜方法において、
前記金属イオンをバイアスにより引き込んで、前記凹部内に金属を含む下地膜を形成する下地膜形成工程と、
前記被処理体にバイアスを印加しつつ、前記金属イオンを発生させない条件でプラズマを生成して、希ガスをイオン化させると共に生成した希ガスのイオンを引き込んで前記下地膜をエッチングするエッチング工程と、
前記被処理体の温度を25〜200℃の範囲内に設定すると共に、前記被処理体に印加したバイアスにより前記金属イオンを引き込んで金属膜よりなる本膜を堆積しつつ前記本膜を加熱リフローさせる成膜リフロー工程と、
を有することを特徴とする成膜方法。 - 前記エッチング工程におけるバイアス電力は、前記下地膜形成工程におけるバイアス電力よりも大きく設定されていることを特徴とする請求項1記載の成膜方法。
- 前記エッチング工程における前記処理容器内の圧力は、前記下地膜形成工程における前記処理容器内の圧力よりも低く設定されていることを特徴とする請求項1又は2記載の成膜方法。
- 前記成膜リフロー工程における前記処理容器内の圧力は、前記エッチング工程における前記処理容器内の圧力よりも高く設定されていることを特徴とする請求項1乃至3のいずれか一項に記載の成膜方法。
- 前記エッチング工程においては、前記ターゲットに印加される直流電力はゼロに設定され、前記金属イオンを発生させるための高周波電力がゼロに設定されることを特徴とする請求項1乃至4のいずれか一項に記載の成膜方法。
- 真空引き可能になされた処理容器内でプラズマにより金属のターゲットをイオン化させて金属イオンを発生させ、前記処理容器内の載置台にバイアス電力を供給して、その載置した被処理体にバイアスを印加して、前記金属イオンを前記被処理体に引き込んで前記被処理体に形成する凹部内に金属の薄膜を堆積させるようにした成膜方法において、
前記金属イオンをバイアスにより引き込んで前記凹部内に金属を含む下地膜を形成しつつ前記下地膜をエッチングする成膜エッチング工程と、
前記被処理体の温度を25〜200℃の範囲内に設定すると共に、前記金属イオンをバイアスにより引き込んで金属膜よりなる本膜を堆積しつつ前記本膜を加熱リフローさせる成膜リフロー工程と、
を有することを特徴とする成膜方法。 - 前記成膜リフロー工程においては、バイアス電力の大きさに依存する成膜量の最大値Tdと前記本膜がエッチングされるエッチング量Teとの比(Te/Td)は0.33以上になるように設定されていることを特徴とする請求項1乃至6のいずれか一項に記載の成膜方法。
- 前記成膜リフロー工程におけるプロセス圧力は、50〜200mTorrの範囲内に設定されていることを特徴とする請求項1乃至7のいずれか一項に記載の成膜方法。
- 前記各工程は、同一の処理容器内で行われることを特徴とする請求項1乃至8のいずれか一項に記載の成膜方法。
- 前記金属は銅よりなることを特徴とする請求項1乃至9のいずれか一項に記載の成膜方法。
- 前記成膜リフロー工程の後に、前記凹部内にメッキにより前記金属を埋め込むメッキ工程が行われることを特徴とする請求項1乃至10のいずれか一項に記載の成膜方法。
- 真空引き可能になされた処理容器と、
凹部の形成された被処理体を載置するための載置台と、
前記処理容器内へ所定のガスを導入するガス導入手段と、
前記処理容器内へプラズマを発生させるためのプラズマ発生源と、
前記処理容器内に設けられて前記プラズマによりイオン化されるべき金属のターゲットと、
前記載置台に対して高周波のバイアス電力を供給するバイアス電源と、
請求項1乃至10のいずれか一項に記載の成膜方法を実施するように装置全体を制御する装置制御部と、
を備えたことを特徴とする成膜装置。
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US13/876,682 US20130237053A1 (en) | 2010-09-28 | 2011-09-26 | Film forming method and film forming apparatus |
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KR1020137010785A KR101481924B1 (ko) | 2010-09-28 | 2011-09-26 | 성막 방법 및 성막 장치 |
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JP5719212B2 (ja) * | 2011-03-30 | 2015-05-13 | 東京エレクトロン株式会社 | 成膜方法およびリスパッタ方法、ならびに成膜装置 |
JP5969306B2 (ja) * | 2012-08-08 | 2016-08-17 | 東京エレクトロン株式会社 | Cu配線の形成方法 |
JP2014075398A (ja) | 2012-10-03 | 2014-04-24 | Tokyo Electron Ltd | プラズマ処理方法及びプラズマ処理装置 |
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JP6268036B2 (ja) * | 2014-05-16 | 2018-01-24 | 東京エレクトロン株式会社 | Cu配線の製造方法 |
JP2016111047A (ja) * | 2014-12-02 | 2016-06-20 | 東京エレクトロン株式会社 | Cu配線の形成方法および半導体装置の製造方法 |
KR102324826B1 (ko) | 2015-04-02 | 2021-11-11 | 삼성전자주식회사 | 배선 구조물, 배선 구조물 형성 방법 및 반도체 장치의 제조 방법 |
JP6748491B2 (ja) * | 2016-06-27 | 2020-09-02 | 東京エレクトロン株式会社 | 基板に形成された凹部に銅配線を形成するための前処理を行う方法、及び、処理装置 |
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