JP2018093139A - プラズマ処理装置及びプラズマ処理方法 - Google Patents
プラズマ処理装置及びプラズマ処理方法 Download PDFInfo
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- JP2018093139A JP2018093139A JP2016237635A JP2016237635A JP2018093139A JP 2018093139 A JP2018093139 A JP 2018093139A JP 2016237635 A JP2016237635 A JP 2016237635A JP 2016237635 A JP2016237635 A JP 2016237635A JP 2018093139 A JP2018093139 A JP 2018093139A
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- Prior art keywords
- gas
- supply unit
- gas supply
- etching
- plasma processing
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Classifications
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Abstract
【解決手段】処理容器と、前記処理容器内に設けられ、基板を保持する載置台と、前記載置台と対向する位置から第1のガスを供給可能な第1のガス供給部と、前記第1のガスをプラズマ化する高周波電源と、前記載置台の周囲を囲むように設けられ、プラズマ化された前記第1のガスを遮蔽する遮蔽部と、前記遮蔽部を介して前記処理容器内を排気する排気部と、前記遮蔽部と前記排気部との間の空間に第2のガスを供給可能な第2のガス供給部と、を有することを特徴とするプラズマ処理装置により上記課題を解決する。
【選択図】図1
Description
本発明の実施形態に係るプラズマ処理装置について説明する。図1は、本発明の実施形態に係るプラズマ処理装置を示す概略断面図である。
次に、本発明の実施形態に係るプラズマ処理装置の動作について説明する。図2は、図1のプラズマ処理装置の動作を説明するためのフローチャートである。
次に、ペクレ数について説明する。図3は、図1のプラズマ処理装置の要部の構成を示す部分断面図である。
次に、本発明の実施形態に係るプラズマ処理方法について説明する。本発明の実施形態に係るプラズマ処理方法は、成膜工程と、エッチング工程とを有する。成膜工程は、吸着工程と反応工程とを含む。吸着工程は、排気空間Bにプリカーサガスを供給し、処理空間Aに不活性ガスを供給することにより、ウエハWの表面にプリカーサガスを吸着させる工程である。反応工程は、処理空間Aにプリカーサガスと反応する反応ガスを供給することにより、プリカーサガスと反応ガスとの反応生成物を生成する工程である。エッチング工程は、処理空間Aにエッチングガスを供給することにより、エッチングを行う工程である。また、それぞれの工程を切り替える際、処理空間Aにパージガスを供給することにより、処理空間Aに残存するプリカーサガス、反応ガス及びエッチングガスをパージガスで置換するパージ工程を行ってもよい。
実施例1では、下記に示すエッチング条件により、エッチング対象膜であるシリコン含有反射防止膜(SiARC)にプラズマエッチングを行った。
(エッチング条件)
第1のガス供給部 O2/CF4=5sccm/55sccm
第2のガス供給部 Ar=200sccm
第1の高周波電源 400W、連続波
第2の高周波電源 50W、連続波
このとき、実施例1の比較のために、パージガスであるArガスを供給する空間を排気空間Bに代えて処理空間Aとした点以外は、実施例1と同様のエッチング条件でSiARCにプラズマエッチングを行った(比較例1)。また、パージガスであるArガスを供給することなく、他のエッチング条件を実施例1と同様の条件でSiARCにプラズマエッチングを行った(参考例1)。
比較例1では、下記に示すエッチング条件により、エッチング対象膜であるSiARCにプラズマエッチングを行った。
(エッチング条件)
第1のガス供給部: O2/CF4=5sccm/55sccm
第2のガス供給部: ガスの供給なし(Ar=0sccm)
処理空間Aにガスを供給可能なガス供給部: Ar=200sccm
第1の高周波電源: 400W、連続波
第2の高周波電源: 50W、連続波
参考例1では、下記に示すエッチング条件により、エッチング対象膜であるSiARCにプラズマエッチングを行った。
(エッチング条件)
第1のガス供給部: O2/CF4=5sccm/55sccm
第2のガス供給部: ガスの供給なし(Ar=0sccm)
第1の高周波電源: 400W、連続波
第2の高周波電源: 50W、連続波
実施例2では、下記に示すエッチング条件により、エッチング対象膜であるスピンオンカーボン(SOC)にプラズマエッチングを行った。
(エッチング条件)
第1のガス供給部: H2/N2=350sccm/350sccm
第2のガス供給部: Ar=200sccm
第1の高周波電源: 500W、連続波
第2の高周波電源: 100W、連続波
このとき、実施例2の比較のために、パージガスであるArガスを供給する空間を排気空間Bに代えて処理空間Aとした点以外は、実施例2と同様のエッチング条件でSOCにプラズマエッチングを行った(比較例2)。また、パージガスであるArガスを供給することなく、他のエッチング条件を実施例1と同様の条件でSOCにプラズマエッチングを行った(参考例2)。
比較例2では、下記に示すエッチング条件により、エッチング対象膜であるSOCにプラズマエッチングを行った。
(エッチング条件)
第1のガス供給部: H2/N2=350sccm/350sccm
第2のガス供給部: ガスの供給なし(Ar=0sccm)
処理空間Aにガスを供給可能なガス供給部: Ar=200sccm
第1の高周波電源: 500W、連続波
第2の高周波電源: 100W、連続波
参考例2では、下記に示すエッチング条件により、エッチング対象膜であるSOCにプラズマエッチングを行った。
(エッチング条件)
第1のガス供給部: H2/N2=350sccm/350sccm
第2のガス供給部: ガスの供給なし(Ar=0sccm)
第1の高周波電源: 500W、連続波
第2の高周波電源: 100W、連続波
実施例3では、まず、図7に示されるように、シリコンウエハ101上に成膜されたエッチング対象膜であるSOC102の上に、SiARC層103及びレジストパターン104を形成した。そして、レジストパターン104をエッチングマスクとして、下記に示すエッチング条件により、SOC104にプラズマエッチングを行った。
(エッチング条件)
第1のガス供給部: H2/N2=350sccm/350sccm
第2のガス供給部: Ar=200sccm
第1の高周波電源: 500W、連続波
第2の高周波電源: 100W、連続波
このとき、実施例3の比較のために、パージガスであるArガスを供給する空間を排気空間Bに代えて処理空間Aとした点以外は、実施例3と同様のエッチング条件でSOC104にプラズマエッチングを行った(比較例3)。
比較例3では、下記に示すエッチング条件により、エッチング対象膜であるSOC104にプラズマエッチングを行った。
(エッチング条件)
第1のガス供給部: H2/N2=350sccm/350sccm
第2のガス供給部: ガスの供給なし(Ar=0sccm)
処理空間Aにガスを供給可能なガス供給部: Ar=200sccm
第1の高周波電源: 500W、連続波
第2の高周波電源: 100W、連続波
図8は、プラズマエッチング後のエッチング対象膜を示す図である。図8(a)はArガスを第2のガス供給部から排気空間Bに供給した場合(実施例3)の結果を示し、図8(b)はArガスを処理空間Aに供給した場合(比較例3)の結果を示している。また、図8(a)及び図8(b)において、左側の図(Center)はウエハの中央部、右側の図(Edge)はウエハの端部、中央の図(Middle)はウエハの中央部と端部との間におけるエッチング対象膜を示している。
実施例4では、下記に示す吸着工程と反応工程とを繰り返し行うことで、ウエハの表面シリコン酸化膜を成膜した。
(吸着工程)
第1のガス供給部: N2
第2のガス供給部: アミノシランガス
(反応工程)
第1のガス供給部: O2
第2のガス供給部: ガスの供給なし
第1の高周波電源: 300W、連続波
第2の高周波電源: 0W
このとき、参考例4として、プリカーサガスであるアミノシランガスを供給する空間を排気空間Bに代えて処理空間Aとした点以外は、実施例4と同様の成膜条件でウエハの表面にシリコン酸化膜を成膜した。
参考例4では、下記に示す吸着工程と反応工程とを繰り返し行うことで、ウエハの表面にシリコン酸化膜を成膜した。
(吸着工程)
第1のガス供給部: アミノシランガス
第2のガス供給部: ガスの供給なし
(反応工程)
第1のガス供給部: O2
第2のガス供給部: ガスの供給なし
第1の高周波電源: 300W、連続波
第2の高周波電源: 0W
12 処理容器
40 第1のガス供給部
48 バッフル板
50 排気装置
62 第1の高周波電源
64 第2の高周波電源
80 第2のガス供給部
90 制御部
PD 載置台
A 処理空間
B 排気空間
W ウエハ
Claims (10)
- 処理容器と、
前記処理容器内に設けられ、基板を保持する載置台と、
前記載置台と対向する位置から第1のガスを供給可能な第1のガス供給部と、
前記第1のガスをプラズマ化する高周波電源と、
前記載置台の周囲を囲むように設けられ、プラズマ化された前記第1のガスを遮蔽する遮蔽部と、
前記遮蔽部を介して前記処理容器内を排気する排気部と、
前記遮蔽部と前記排気部との間の空間に第2のガスを供給可能な第2のガス供給部と、
を有することを特徴とするプラズマ処理装置。 - 前記第1のガス供給部及び前記第2のガス供給部の動作を制御する制御部を有することを特徴とする請求項1に記載のプラズマ処理装置。
- 前記第1のガス供給部は、第1のパージガスを供給可能であり、
前記制御部は、前記基板に対して前記第2のガスを供給する場合、前記第1のガス供給部から前記第1のパージガスを供給し、前記第2のガス供給部から前記第2のガスを供給するように、前記第1のガス供給部及び前記第2のガス供給部の動作を制御することを特徴とする請求項2に記載のプラズマ処理装置。 - 前記制御部は、前記第1のガス供給部から前記第2のガス供給部までの間のガスの輸送が流れよりも拡散が支配的となるように、前記第1のガス供給部から供給される前記第1のパージガスの流量及び前記載置台と前記第1のガス供給部との間の距離の少なくともいずれかを制御することを特徴とする請求項3に記載のプラズマ処理装置。
- 前記制御部は、前記基板の端部から前記第2のガス供給部までの距離をL1、前記第1のパージガスの流れに垂直となる空間断面積をS1(x)、前記第1のパージガスの供給流量をQ1、前記処理容器内の圧力をP1、前記第1のパージガスに対する前記第2のガスの拡散係数をD1としたとき、下記の数式(2)により算出されるペクレ数Pe1が1より小さくなるように、前記第1のガス供給部から供給される前記第1のパージガスの流量及び第1のパージガスの流れに垂直となる空間断面積S1(x)の少なくともいずれかを制御することを特徴とする請求項3に記載のプラズマ処理装置。
- 前記第2のガス供給部は、第2のパージガスを供給可能であり、
前記制御部は、前記基板に対して前記第1のガスを供給する場合、前記第1のガス供給部から前記第1のガスを供給し、前記第2のガス供給部から前記第2のパージガスを供給するように、前記第1のガス供給部及び前記第2のガス供給部の動作を制御することを特徴とする請求項2乃至5のいずれか一項に記載のプラズマ処理装置。 - 前記制御部は、前記第1のガス供給部から前記第2のガス供給部までの間のガスの輸送が拡散よりも流れが支配的となるように、前記第1のガス供給部から供給される前記第1のガスの流量及び前記載置台と前記第1のガス供給部との間の距離の少なくともいずれかを制御することを特徴とする請求項6に記載のプラズマ処理装置。
- 前記制御部は、前記基板の端部から前記第2のガス供給部までの距離をL2、前記第1のガスの流れに垂直となる空間断面積をS2(x)、前記第1のガスの供給流量をQ2、前記処理容器内の圧力をP2、前記第1のガスに対する前記第2のパージガスの拡散係数をD2としたとき、下記の数式(3)により算出されるペクレ数Pe2が1より大きくなるように、前記第1のガス供給部から供給される前記第1のガスの流量及び第1のガスの流れに垂直となる空間断面積S2(x)の少なくともいずれかを制御することを特徴とする請求項6に記載のプラズマ処理装置。
- 前記第2のガスは、アミノシラン系ガスであ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プラズマ処理装置。
- 処理容器内において基板にガスを供給し所定の処理を行う処理空間と、前記処理空間と連通し前記処理空間の圧力よりも小さい圧力を有する排気空間と、を有するプラズマ処理装置におけるプラズマ処理方法であって、
前記排気空間に第2のガスを供給し、前記処理空間にパージガスを供給することにより、前記基板の上に前記第2のガスを吸着させる吸着工程と、
前記処理空間に前記第2のガスと反応する第1のガスを供給することにより、前記第2のガスと前記第1のガスとの反応生成物を生成する反応工程と、
前記処理空間にエッチングガスを供給することにより、前記反応生成物の少なくとも一部をエッチングするエッチング工程と、
を有することを特徴とするプラズマ処理方法。
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JP2020123646A (ja) * | 2019-01-30 | 2020-08-13 | 東京エレクトロン株式会社 | エッチング方法、プラズマ処理装置、及び処理システム |
CN113357113A (zh) * | 2021-07-02 | 2021-09-07 | 兰州空间技术物理研究所 | 一种空间电推力器供气绝缘一体化结构 |
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JP6811202B2 (ja) * | 2018-04-17 | 2021-01-13 | 東京エレクトロン株式会社 | エッチングする方法及びプラズマ処理装置 |
CN110867365B (zh) * | 2019-11-04 | 2022-05-27 | 北京北方华创微电子装备有限公司 | 等离子体系统 |
KR102675856B1 (ko) * | 2020-01-20 | 2024-06-17 | 에이에스엠 아이피 홀딩 비.브이. | 박막 형성 방법 및 박막 표면 개질 방법 |
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