JP7236315B2 - 処理方法およびプラズマ処理装置 - Google Patents
処理方法およびプラズマ処理装置 Download PDFInfo
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- JP7236315B2 JP7236315B2 JP2019076364A JP2019076364A JP7236315B2 JP 7236315 B2 JP7236315 B2 JP 7236315B2 JP 2019076364 A JP2019076364 A JP 2019076364A JP 2019076364 A JP2019076364 A JP 2019076364A JP 7236315 B2 JP7236315 B2 JP 7236315B2
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- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02274—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition in the presence of a plasma [PECVD]
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- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
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- C23C16/52—Controlling or regulating the coating process
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
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Description
工程ST5では、工程ST2aにおいて、ウエハWの表面における前駆体層の形成を飽和させないことにより、および/または、工程ST2cにおいて、前駆体層の第2膜M2への変換を飽和させないことにより、第2膜M2をサブコンフォーマルに形成し得る。すなわち、工程ST5における第2膜M2の形成は、不飽和原子堆積により行ってもよい。不飽和原子堆積は、下記(a)~(c)の何れかを満たす。
(a)ウエハWの第1膜M1が存在しない領域に前駆体層を形成するための第2のガスG1の吸着を飽和させない。
(b)ウエハWの第1膜M1が存在しない領域に吸着した第2のガスG1の改質を飽和させない。
(c)第2のガスG1の吸着とウエハWの第1膜M1が存在しない領域に吸着した第2のガスG1の改質を飽和させない。
不飽和原子堆積は、第2のガスG1を表面の全体に吸着させない場合の他、完全に改質させない場合もある。不飽和原子堆積によれば、第2膜をサブコンフォーマルに形成することができる。より具体的には、パターン上部では第2膜M2を厚く形成し、当該パターンの底部に向かうにつれて第2膜M2を薄く形成することができる。なお、上記の(a)~(c)の事項を除いて、不飽和原子堆積の工程および条件等については、上述した通常の原子堆積の工程および条件等と同様とすることができる。このため、工程ST5において、通常の原子堆積に代えて不飽和原子堆積を実行した場合であっても、工程ST2cにおける第3のガスにより第1膜M1の一部が除去され、第1膜M1の膜厚が減少または消滅する。
工程ST5と工程ST5の後に処理容器12内でウエハWをエッチングする工程(後述する図14に示す工程ST6)とを繰り返し実行する場合に、工程ST5のプロセス条件を変更することで、第2膜M2の位置及び厚みを変更し得る。すなわち、上記では状態CD10の後さらに第1膜M1を形成し、第2膜M2を形成する例を示したが、この例に限られず、状態CD10の後に領域R2をエッチングしてもよい。また、領域R2のエッチングと、シーケンスSQ1またはシーケンスSQ2を繰り返し実行してもよい。この構成によれば、構造の側壁(表面SF3)に第2膜M2が形成されているので、エッチングの際のボーイング等の形状異常を抑制することができる。
変形例1および変形例2では、処理条件の調整により第2膜M2の被覆率と膜厚とを調整した。ところで、工程ST2aおよび工程ST2cにおける処理条件は以下の二つの観点で調整できる。
(1)ドーズ量を制御することでパターンの深さ方向における成膜位置を制御する。
(2)形成する第2膜M2の膜厚を制御する。
<工程ST1>
・処理空間Sp内の圧力:20[mTorr]
・第1の高周波電源62による電力:300[W]
・第2の高周波電源64による電力:0[W]
・第1のガス流量:C4F6ガス(30[sccm])/Arガス(300[sccm])
・ウエハWの温度:40[℃]
・実行時間:15[秒]
<工程ST2a>
・処理空間Spの圧力:100[mTorr]
・第1の高周波電源62による電力:0[W]
・第2の高周波電源64による電力:0[W]
・第1のガス流量:アミノシラン系ガス(50[sccm])
・ウエハWの温度:10[℃]
・実行時間:15[秒]
<工程ST2c>
・処理空間Spの圧力:200[mTorr]
・第1の高周波電源62による電力:300[W]
・第2の高周波電源64による電力:0[W]
・第1のガス流量:CO2ガス(300[sccm])
・ウエハWの温度:10[℃]
・実行時間:10[秒]
<工程ST1>
・処理空間Spの圧力:30[mTorr]
・第1の高周波電源62による電力:0[W]
・第2の高周波電源64による電力:25[W]
・第1のガス流量:C4F6ガス(40[sccm])/Arガス(1000[sccm])
・ウエハWの温度:60[℃]
・実行時間:15[秒]
<工程ST2a>
・処理空間Spの圧力:200[mTorr]
・第1の高周波電源62による電力:0[W]
・第2の高周波電源64による電力:0[W]
・第1のガス流量:アミノシラン系ガス(100[sccm])
・ウエハWの温度:60[℃]
・実行時間:15[秒]
<工程ST2c>
・処理空間Spの圧力:200[mTorr]
・第1の高周波電源62による電力:500[W]
・第2の高周波電源64による電力:0[W]
・第1のガス流量:CO2ガス(300[sccm])
・ウエハWの温度:60[℃]
・実行時間:2[秒]
Claims (24)
- 処理容器内にパターンが形成された被処理体を提供する工程と、
前記パターンの上部及び底部にプラズマ化学気相成長により選択的に第1膜を形成する第1工程と、
前記第1膜が存在しない領域に第2膜を形成する第2工程と、を有し、
前記第2膜を形成する前記第2工程は、
前駆体ガスを前記被処理体に供給して前記被処理体の表面に前駆体層を形成する工程と、
前記前駆体層の改質のために前記前駆体層をプラズマに晒すことにより前記前駆体層を前記第2膜に変換する工程と、
を含む、被処理体の処理方法。 - 前記第2工程の後に、前記被処理体をエッチングする工程をさらに含む請求項1に記載の処理方法。
- 前記第1工程は、前記第1膜を形成した後に、前記パターンの底部に形成された該第1膜を除去する、
請求項1または2に記載の処理方法。 - 処理容器内にパターンが形成された被処理体を提供する工程と、
前記パターンの上部にプラズマ化学気相成長により選択的に第1膜を形成する第1工程と、
前記パターンの前記第1膜が存在しない領域に第2膜を形成する第2工程と、
前記パターンの底部をエッチングする工程と、を有し、
前記第2膜を形成する前記第2工程は、
前駆体ガスを前記被処理体に供給して前記被処理体の表面に前駆体層を形成する工程と、
前記前駆体層の改質のために前記前駆体層をプラズマに晒すことにより前記前駆体層を前記第2膜に変換する工程と、
を含む、被処理体の処理方法。 - 前記第2膜を形成する工程において、前記第2膜を形成する間、前記第1膜の膜厚は減少する、請求項1~4の何れか一項に記載の被処理体の処理方法。
- 前記第1工程と、前記第2工程とは繰り返される、請求項1~5の何れか一項に記載の処理方法。
- 前記第1膜が存在しない領域は、前記第1工程において前記第1膜が形成されない領域である、請求項1~6の何れか一項に記載の処理方法。
- 前記第1膜が存在しない領域は、前記第1工程において形成された前記第1膜が前記第2工程前のプラズマ処理、または前記第2工程において除去された領域をさらに含む、請求項7に記載の処理方法。
- 前記第2工程は、
前記処理容器内に前駆体ガスを供給し前記被処理体の表面に前駆体層を形成する第3工程と、
前記第3工程の後に前記処理容器内の空間をパージする第4工程と、
前記第4工程の後に前記処理容器内において改質プラズマを前記前駆体に晒すことにより前記前駆体層を前記第2膜に変換する第5工程と、
前記第5工程の後に前記処理容器内の空間をパージする第6工程と、
を含むシーケンスを繰り返し実行して前記第2膜を形成する、
請求項1~8の何れか一項に記載の処理方法。 - 処理容器内に被処理体を提供する工程と、
前記被処理体の表面にプラズマ化学気相成長により選択的に第1膜を形成する第1工程と、
前記第1膜が存在しない領域に第2膜を形成する第2工程と、を有し、
前記第2膜を形成する前記第2工程は、
前駆体ガスを前記被処理体に供給して前記被処理体の表面に前駆体層を形成する工程と、
前記前駆体層の改質のために前記前駆体層をプラズマに晒すことにより前記前駆体層を前記第2膜に変換する工程と、
を含み、
前記第2工程は、
前記処理容器内に前駆体ガスを供給し前記被処理体の表面に前駆体層を形成する第3工程と、
前記第3工程の後に前記処理容器内の空間をパージする第4工程と、
前記第4工程の後に前記処理容器内において改質プラズマを前記前駆体に晒すことにより前記前駆体層を前記第2膜に変換する第5工程と、
前記第5工程の後に前記処理容器内の空間をパージする第6工程と、
を含むシーケンスを繰り返し実行する工程であり、
前記第3工程において、前記被処理体の表面における前記前駆体層の形成を飽和させないことにより、および/または、前記第5工程において、前記前駆体層の前記第2膜への変換を飽和させないことにより、前記第2膜をサブコンフォーマルに形成する、
処理方法。 - 前記前駆体ガスは、アミノシラン系ガス、シリコンを含有するガス、チタンを含有するガス、ハフニウムを含有するガス、タンタルを含有するガス、ジルコニウムを含有するガス、または有機物を含有するガスの何れかであり、
前記改質プラズマは、酸素を含むガス、窒素を含むガス、または水素を含むガスの何れかから生成される、
請求項9または10に記載の処理方法。 - 処理容器内に被処理体を提供する工程と、
前記被処理体の表面にプラズマ化学気相成長により選択的に第1膜を形成する第1工程と、
前記第1膜が存在しない領域に第2膜を形成する第2工程と、を有し、
前記第2膜を形成する前記第2工程は、
前駆体ガスを前記被処理体に供給して前記被処理体の表面に前駆体層を形成する工程と、
前記前駆体層の改質のために前記前駆体層をプラズマに晒すことにより前記前駆体層を前記第2膜に変換する工程と、
を含み、
前記第2工程は、
前記処理容器内に前駆体ガスを供給し前記被処理体の表面に前駆体層を形成する第3工程と、
前記第3工程の後に前記処理容器内の空間をパージする第4工程と、
前記第4工程の後に前記処理容器内において改質プラズマを前記前駆体に晒すことにより前記前駆体層を前記第2膜に変換する第5工程と、
前記第5工程の後に前記処理容器内の空間をパージする第6工程と、
を含むシーケンスを繰り返し実行して前記第2膜を形成し、
前記シーケンスを繰り返し実行する場合に、前記第5工程の条件は第n回目(nは正の整数)の実行時と第n+1回目の実行時とにおいて異なる、
処理方法。 - 前記第1工程と前記第2工程とは同一の処理容器内で真空を保ったまま連続して行われる請求項1~12の何れか一項に記載の処理方法。
- 前記第2工程において、前記被処理体が載置される載置台の温度を位置に応じて異なる温度に制御して、形成する前記第2膜の厚みを前記載置台の温度に応じて変化させる、請求項1~13の何れか一項に記載の処理方法。
- 前記第1工程の前に、前記被処理体をエッチングする工程をさらに含む請求項1~14の何れか一項に記載の処理方法。
- 前記第2工程と前記第2工程の後に前記処理容器内で前記被処理体をエッチングする工程とを繰り返し実行する場合に、前記第2工程の条件を変更することで、前記第2膜の位置および厚みを変更する、請求項15に記載の処理方法。
- 前記第1工程と前記第2工程とを繰り返し実行する場合に、前記第1工程の条件は、第m回目(mは正の整数)の実行時と第m+1回目の実行時とにおいて異なる、
請求項9~15の何れか一項に記載の処理方法。 - 被処理体を提供する工程と、
前記被処理体の表面にプラズマ化学気相成長により選択的に第1膜を形成する第1工程と、
前記被処理体の前記第1膜が存在しない領域に第2膜をサブコンフォーマルに形成する第2工程と、
を含む、被処理体の処理方法。 - 被処理体を収容する少なくとも1つの処理容器と、該少なくとも1つの処理容器内において前記被処理体に対する処理を制御する制御部とを備え、
前記制御部は、
前記少なくとも1つの処理容器内で、前記被処理体に形成されたパターンの上部及び底部にプラズマ化学気相成長を用いて第1膜を選択的に形成する第1処理と、該パターンの該第1膜が存在しない領域に第2膜を形成する第2処理と、を含むシーケンスを繰り返し実行するシーケンス実行部を備え、
前記第2処理は、前駆体ガスを前記被処理体に供給して前記被処理体の表面に前駆体層を形成する処理と、
前記前駆体層の改質のために前記前駆体層をプラズマに晒すことにより前記前駆体層を前記第2膜に変換する処理と、
を含む、
プラズマ処理装置。 - 被処理体を収容する少なくとも1つの処理容器と、該少なくとも1つの処理容器内において前記被処理体に対する処理を制御する制御部とを備え、
前記制御部は、
前記少なくとも1つの処理容器内で、前記被処理体に形成されたパターンの表面にプラズマ化学気相成長を用いて第1膜を選択的に形成する第1処理と、該パターンの該第1膜が存在しない領域に第2膜を形成する第2処理と、前記パターンの底部をエッチングする工程と、を含むシーケンスを繰り返し実行するシーケンス実行部を備え、
前記第2処理は、前駆体ガスを前記被処理体に供給して前記被処理体の表面に前駆体層を形成する処理と、
前記前駆体層の改質のために前記前駆体層をプラズマに晒すことにより前記前駆体層を前記第2膜に変換する処理と、
を含む、
プラズマ処理装置。 - 被処理体を収容する少なくとも1つの処理容器と、該少なくとも1つの処理容器内において前記被処理体に対する処理を制御する制御部とを備え、
前記制御部は、
前記被処理体に形成されたパターンの上部及び底部に選択的に第1膜を形成する第1工程と、
前記第1膜が存在しない前記被処理体の表面に第2膜を形成する第2工程と、
を有し、
前記第2工程は、
前記処理容器内に前駆体ガスを供給し前記被処理体の前記第1膜が存在しない領域に前駆体層を形成し、
前記処理容器内において改質プラズマを前記前駆体に晒すことにより前記前駆体層を第2膜に変換し、
前記改質プラズマは、前記第1膜の膜厚を減少させる、
処理を実行するように構成される、
プラズマ処理装置。 - 被処理体を収容する少なくとも1つの処理容器と、該少なくとも1つの処理容器内において前記被処理体に対する処理を制御する制御部とを備え、
前記制御部は、
前記被処理体に形成されたパターンの上部に第1膜を形成する第1工程と、
前記第1膜が存在しない前記被処理体の表面に第2膜を形成する第2工程と、
前記パターンの底部をエッチングする工程と、
を有し、
前記第2工程は、
前記処理容器内に前駆体ガスを供給し前記被処理体の前記第1膜が存在しない領域に前駆体層を形成し、
前記処理容器内において改質プラズマを前記前駆体に晒すことにより前記前駆体層を第2膜に変換し、
前記改質プラズマは、前記第1膜の膜厚を減少させる、
処理を実行するように構成される、
プラズマ処理装置。 - 前記制御部は、前記第1工程と前記第2工程とを繰り返す処理を実行するように構成される、請求項21又は22に記載のプラズマ処理装置。
- 前記第2膜は前記表面の領域毎に異なる膜厚を有する、請求項21又は23に記載のプラズマ処理装置。
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