JP6763750B2 - 被処理体を処理する方法 - Google Patents
被処理体を処理する方法 Download PDFInfo
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- JP6763750B2 JP6763750B2 JP2016217163A JP2016217163A JP6763750B2 JP 6763750 B2 JP6763750 B2 JP 6763750B2 JP 2016217163 A JP2016217163 A JP 2016217163A JP 2016217163 A JP2016217163 A JP 2016217163A JP 6763750 B2 JP6763750 B2 JP 6763750B2
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- 238000000034 method Methods 0.000 title claims description 66
- 239000007789 gas Substances 0.000 claims description 246
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 31
- 229910052710 silicon Inorganic materials 0.000 claims description 31
- 239000010703 silicon Substances 0.000 claims description 31
- 150000002500 ions Chemical class 0.000 claims description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims description 20
- 238000010926 purge Methods 0.000 claims description 20
- 150000004767 nitrides Chemical class 0.000 claims description 14
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 12
- 229910052731 fluorine Inorganic materials 0.000 claims description 12
- 239000011737 fluorine Substances 0.000 claims description 12
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 9
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 210000002381 plasma Anatomy 0.000 description 70
- 238000005530 etching Methods 0.000 description 36
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 21
- 239000003507 refrigerant Substances 0.000 description 12
- 229910004298 SiO 2 Inorganic materials 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 101001090150 Equus caballus Sperm histone P2a Proteins 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000009616 inductively coupled plasma Methods 0.000 description 5
- 125000004429 atom Chemical group 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000003486 chemical etching Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 238000004380 ashing Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- -1 nitrogen ions Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 101001016600 Equus caballus Sperm histone P2b Proteins 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000007261 regionalization Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
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Description
<工程ST2a>
・処理容器192内の圧力[mTorr]:30[mTorr]
・高周波電源150Aおよび高周波電源150Bの高周波電力の値[W]:0[W](27[MHz])
・高周波電源64の高周波電力の値[W]:0〜200[W](13[MHz])
・第1の処理ガス:N2ガス
・第1の処理ガスの流量[sccm]:500[sccm]
・処理時間[s]:10〜60[s]
高周波電源64の高周波電力の値は、20〜100[W]が好適であり得る。高周波電源64の高周波電力の値がこの範囲にある場合、被エッチング層ELにおいてシリコンの酸化物に対するシリコンの窒化物のエッチング量を比較的に多く維持しつつ、被エッチング層ELに対する第1の処理ガスのプラズマによるスパッタ量を十分に低減し得ることが発明者によって見出された。
・処理容器192内の圧力[mTorr]:50〜400[mTorr]
・高周波電源150Aおよび高周波電源150Bの高周波電力の値[W]:0〜800[W](27[MHz])
・高周波電源64の高周波電力の値[W]:0[W](13[MHz])
・第2の処理ガス:NF3ガスおよびO2ガスを含む混合ガス
・第2の処理ガスの流量[sccm]:120[sccm](NF3ガス)、40[sccm](O2ガス)
・処理時間[s]:10〜50[s]
なお、処理容器192内の圧力が高いほど、シリコンの酸化物に対するシリコンの窒化物のエッチング量(選択比)が多く(高く)なり、さらに、エッチングによって混合層MXが全て除去された後には、工程ST2cを継続しても被エッチング層ELに対するエッチング量が少なくなる、という現象が発明者によって見出された。
・処理容器192内の圧力[mTorr]:350[mTorr]
・高周波電源150Aおよび高周波電源150Bの高周波電力の値[W]:200[W](27[MHz])
・高周波電源64の高周波電力の値[W]:0[W](13[MHz])
・第2の処理ガス:NF3ガスおよびO2ガスを含む混合ガス
・第2の処理ガスの流量[sccm]:45[sccm](NF3ガス)、300[sccm](O2ガス)、40[sccm](H2ガス)、100[sccm](Arガス)
・処理時間[s]:10[s]
・繰り返し回数:20〜50回
なお、シーケンスSQの繰り返し回数が多いほど、被エッチング層ELに対するエッチング量も多くなる。
<工程ST2a>
・処理容器192内の圧力[mTorr]:10[mTorr]
・処理容器192の天井部に設けられる高周波電源の高周波電力の値[W]:500[W](60[MHz])
・高周波電源64の高周波電力の値[W]:100[W](13[MHz])
・第1の処理ガス:N2ガス
・第1の処理ガスの流量[sccm]:500[sccm]
・処理時間[s]:60[s]
<工程ST2c>
・処理容器192内の圧力[mTorr]:50[mTorr]
・処理容器192の天井部に設けられる高周波電源の高周波電力の値[W]:1000[W](60[MHz])
・高周波電源64の高周波電力の値[W]:0〜100[W](13[MHz])
・第2の処理ガス:CH3Fガス、O2ガスおよびArガスを含む混合ガス
・第2の処理ガスの流量[sccm]:25[sccm](CH3Fガス)、20[sccm](O2ガス)、700[sccm](Arガス)
・処理時間[s]:60[s]
<アッシング処理>
・処理容器192内の圧力[mTorr]:100[mTorr]
・処理容器192の天井部に設けられる高周波電源の高周波電力の値[W]:600[W](60[MHz])
・高周波電源64の高周波電力の値[W]:0[W](13[MHz])
・第2の処理ガス:O2ガス
・第2の処理ガスの流量[sccm]:750[sccm]
・処理時間[s]:60[s]
Claims (8)
- 被処理体を処理する方法であって、該被処理体は被エッチング層と該被エッチング層上に設けられたマスクと該マスクに設けられた溝とを備え、該溝は該マスクの表面から該被エッチング層に至り該被エッチング層を露出し、該方法は、
前記被処理体が収容されているプラズマ処理装置の処理容器内において窒素ガスを含む第1の処理ガスのプラズマを生成し、窒素原子のイオンを含む混合層を、前記溝を介して前記被エッチング層の表面の原子層に形成する第1の工程と、
前記第1の工程の実行後に、前記処理容器内の空間をパージする第2の工程と、
前記第2の工程の実行後に、前記処理容器内においてフッ素を含む第2の処理ガスのプラズマを生成し、該第2の処理ガスのプラズマに含まれるラジカルによって前記混合層を除去する第3の工程と、
前記第3の工程の実行後に、前記処理容器内の空間をパージする第4の工程と、
を含むシーケンスを繰り返し実行し、前記被エッチング層を原子層毎に除去することによって、該被エッチング層をエッチングし、
前記被エッチング層は、シリコンの酸化物を含み、
前記第3の工程において生成される前記第2の処理ガスのプラズマは、シリコンの窒化物を含む前記混合層を除去する前記ラジカルを含む、
方法。 - 被処理体を処理する方法であって、該被処理体は被エッチング層と該被エッチング層上に設けられたマスクと該マスクに設けられた溝とを備え、該溝は該マスクの表面から該被エッチング層に至り該被エッチング層を露出し、該方法は、
前記被処理体が収容されているプラズマ処理装置の処理容器内において第1の処理ガスのプラズマを生成し、該第1の処理ガスのプラズマに含まれるイオンを含む混合層を、前記溝を介して前記被エッチング層の表面の原子層に形成する第1の工程と、
前記第1の工程の実行後に、前記処理容器内の空間をパージする第2の工程と、
前記第2の工程の実行後に、前記処理容器内において第2の処理ガスのプラズマを生成し、該第2の処理ガスのプラズマに含まれるラジカルによって前記混合層を除去する第3の工程と、
前記第3の工程の実行後に、前記処理容器内の空間をパージする第4の工程と、
を含むシーケンスを繰り返し実行し、前記被エッチング層を原子層毎に除去することによって、該被エッチング層をエッチングし、
前記被エッチング層は、シリコンの酸化物を含み、
前記第1の処理ガスは、窒素を含み、
前記第2の処理ガスは、フッ素を含み、
前記第3の工程において生成される前記第2の処理ガスのプラズマは、シリコンの窒化物を含む前記混合層を除去する前記ラジカルを含み、
前記第1の工程では、前記第1の処理ガスのプラズマにバイアス電圧を印加して、前記被エッチング層の表面の原子層に前記イオンを含む前記混合層を形成する、
方法。 - 被処理体を処理する方法であって、該被処理体は被エッチング層と該被エッチング層上に設けられたマスクと該マスクに設けられた溝とを備え、該溝は該マスクの表面から該被エッチング層に至り該被エッチング層を露出し、該方法は、
前記被処理体が収容されているプラズマ処理装置の処理容器内において第1の処理ガスのプラズマを生成し、該第1の処理ガスのプラズマに含まれるイオンを含む混合層を、前記溝を介して前記被エッチング層の表面の原子層に形成する第1の工程と、
前記第1の工程の実行後に、前記処理容器内の空間をパージする第2の工程と、
前記第2の工程の実行後に、前記処理容器内において第2の処理ガスのプラズマを生成し、該第2の処理ガスのプラズマに含まれるラジカルによって前記混合層を除去する第3の工程と、
前記第3の工程の実行後に、前記処理容器内の空間をパージする第4の工程と、
を含むシーケンスを繰り返し実行し、前記被エッチング層を原子層毎に除去することによって、該被エッチング層をエッチングし、
前記被エッチング層は、シリコンの酸化物を含み、
前記第1の処理ガスは、窒素を含み、
前記第2の処理ガスは、フッ素を含み、
前記第3の工程において生成される前記第2の処理ガスのプラズマは、シリコンの窒化物を含む前記混合層を除去する前記ラジカルを含み、
前記第2の処理ガスは、NF3ガスおよびO2ガスを含む混合ガスである、
方法。 - 被処理体を処理する方法であって、該被処理体は被エッチング層と該被エッチング層上に設けられたマスクと該マスクに設けられた溝とを備え、該溝は該マスクの表面から該被エッチング層に至り該被エッチング層を露出し、該方法は、
前記被処理体が収容されているプラズマ処理装置の処理容器内において第1の処理ガスのプラズマを生成し、該第1の処理ガスのプラズマに含まれるイオンを含む混合層を、前記溝を介して前記被エッチング層の表面の原子層に形成する第1の工程と、
前記第1の工程の実行後に、前記処理容器内の空間をパージする第2の工程と、
前記第2の工程の実行後に、前記処理容器内において第2の処理ガスのプラズマを生成し、該第2の処理ガスのプラズマに含まれるラジカルによって前記混合層を除去する第3の工程と、
前記第3の工程の実行後に、前記処理容器内の空間をパージする第4の工程と、
を含むシーケンスを繰り返し実行し、前記被エッチング層を原子層毎に除去することによって、該被エッチング層をエッチングし、
前記被エッチング層は、シリコンの酸化物を含み、
前記第1の処理ガスは、窒素を含み、
前記第2の処理ガスは、フッ素を含み、
前記第3の工程において生成される前記第2の処理ガスのプラズマは、シリコンの窒化物を含む前記混合層を除去する前記ラジカルを含み、
前記第2の処理ガスは、NF3ガス、O2ガス、H2ガスおよびArガスを含む混合ガスである、
方法。 - 被処理体を処理する方法であって、該被処理体は被エッチング層と該被エッチング層上に設けられたマスクと該マスクに設けられた溝とを備え、該溝は該マスクの表面から該被エッチング層に至り該被エッチング層を露出し、該方法は、
前記被処理体が収容されているプラズマ処理装置の処理容器内において第1の処理ガスのプラズマを生成し、該第1の処理ガスのプラズマに含まれるイオンを含む混合層を、前記溝を介して前記被エッチング層の表面の原子層に形成する第1の工程と、
前記第1の工程の実行後に、前記処理容器内の空間をパージする第2の工程と、
前記第2の工程の実行後に、前記処理容器内において第2の処理ガスのプラズマを生成し、該第2の処理ガスのプラズマに含まれるラジカルによって前記混合層を除去する第3の工程と、
前記第3の工程の実行後に、前記処理容器内の空間をパージする第4の工程と、
を含むシーケンスを繰り返し実行し、前記被エッチング層を原子層毎に除去することによって、該被エッチング層をエッチングし、
前記被エッチング層は、シリコンの酸化物を含み、
前記第1の処理ガスは、窒素を含み、
前記第2の処理ガスは、フッ素を含み、
前記第3の工程において生成される前記第2の処理ガスのプラズマは、シリコンの窒化物を含む前記混合層を除去する前記ラジカルを含み、
前記第2の処理ガスは、CH3Fガス、O2ガスおよびArガスを含む混合ガスである、
方法。 - 前記第2の処理ガスは、NF 3 ガスおよびO 2 ガスを含む混合ガスである、
請求項1または請求項2に記載の方法。 - 前記第2の処理ガスは、NF 3 ガス、O 2 ガス、H 2 ガスおよびArガスを含む混合ガスである、
請求項1または請求項2に記載の方法。 - 前記第2の処理ガスは、CH 3 Fガス、O 2 ガスおよびArガスを含む混合ガスである、
請求項1または請求項2に記載の方法。
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