JP6757624B2 - 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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- JP6757624B2 JP6757624B2 JP2016158659A JP2016158659A JP6757624B2 JP 6757624 B2 JP6757624 B2 JP 6757624B2 JP 2016158659 A JP2016158659 A JP 2016158659A JP 2016158659 A JP2016158659 A JP 2016158659A JP 6757624 B2 JP6757624 B2 JP 6757624B2
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- H—ELECTRICITY
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
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- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
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Description
・処理容器12内の圧力[mTorr]:50[mTorr]
・第1の高周波電源62の高周波電力の値[W]:500[W]
・第2の高周波電源64の高周波電力の値[W]:300[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス:CF4ガス
・処理ガスの流量[sccm]:600[sccm]
・処理時間[s]:28[s]
・処理容器12内の圧力[mTorr]:20[mTorr]
・第1の高周波電源62の高周波電力の値[W]:500[W]
・第2の高周波電源64の高周波電力の値[W]:400[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGA):N2/H2
・処理ガスの流量[sccm]:(N2ガス)200[sccm]、(H2ガス)200[sccm]
・処理時間[s]:40[s]
・処理容器12内の圧力[mTorr]:50[mTorr]
・第1の高周波電源62の高周波電力の値[W]:300[W]
・第2の高周波電源64の高周波電力の値[W]:0[W]
・電源70の直流電圧の値[V]:−900[V]
・処理ガス:H2/Arガス
・処理ガスの流量[sccm]:(H2ガス)100[sccm]、(Arガス)800[sccm]
・処理時間[s]:60[s]
・処理容器12内の圧力[mTorr]:100[mTorr]
・第1の高周波電源62の高周波電力の値[W]:0[W]
・第2の高周波電源64の高周波電力の値[W]:0[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGB):モノアミノシラン(H3−Si−R(Rはアミノ基))
・処理ガスの流量[sccm]:50[sccm]
・処理時間[s]:15[s]
・処理容器12内の圧力[mTorr]:200[mTorr]
・第1の高周波電源62の高周波電力の値[W]:300[W]、10[kHz]、Duty50
・第2の高周波電源64の高周波電力の値[W]:0[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGC):CO2ガス
・処理ガスの流量[sccm]:300[sccm]
・処理時間[s]:5[s]
なお、工程ST5cでは、上記のプロセス条件のもとで行う処理の実行前に、以下の処理が実行される。
・処理容器12内の圧力[mTorr]:0[mTorr]
・第1の高周波電源62の高周波電力の値[W]:0[W]
・第2の高周波電源64の高周波電力の値[W]:0[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGC):CO2ガス
・処理ガスの流量[sccm]:300[sccm]
・処理時間[s]:10[s]
・処理容器12内の圧力[mTorr]:20[mTorr]
・第1の高周波電源62の高周波電力の値[W]:100[W]
・第2の高周波電源64の高周波電力の値[W]:100[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGD):CF4/Arガス
・処理ガスの流量[sccm]:(CF4ガス)50[sccm]、(Arガス)300[sccm]
・処理時間[s]:25[s]
(条件Cond1)
・処理容器12内の圧力[mTorr]:50[mTorr]
・第1の高周波電源62の高周波電力の値[W]:100[W]
・第2の高周波電源64の高周波電力の値[W]:300[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGE):CH3F/Ar/O2ガス
・処理ガスの流量[sccm]:(CH3Fガス)40[sccm]、(Arガス)90[sccm]、(O2ガス)22[sccm]
・処理時間[s]:45[s]
なお、工程ST8のプロセス条件の実施例は、上記の条件Cond1に代えて、下記の条件Cond2,Cond3の何れかを含み得る。
(条件Cond2)
・処理容器12内の圧力[mTorr]:100[mTorr]
・第1の高周波電源62の高周波電力の値[W]:500[W]
・第2の高周波電源64の高周波電力の値[W]:300[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGE):CF4ガス
・処理ガスの流量[sccm]:200[sccm]
・処理時間[s]:30[s]
(条件Cond3)
・処理容器12内の圧力[mTorr]:200[mTorr]
・第1の高周波電源62の高周波電力の値[W]:100[W]
・第2の高周波電源64の高周波電力の値[W]:400[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGE):Cl2/Ar/O2ガス
・処理ガスの流量[sccm]:(Cl2ガス)70[sccm]、(Arガス)500[sccm]、(O2ガス)18[sccm]
・処理時間[s]:30[s]
・処理容器12内の圧力[mTorr]:20[mTorr]
・第1の高周波電源62の高周波電力の値[W]:600[W]
・第2の高周波電源64の高周波電力の値[W]:400[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGF):N2/H2ガス
・処理ガスの流量[sccm]:(N2ガス)200[sccm]、(H2ガス)200[sccm]
・処理時間[s]:15[s]
・処理容器12内の圧力[mTorr]:30[mTorr]
・第1の高周波電源62の高周波電力の値[W]:100[W]
・第2の高周波電源64の高周波電力の値[W]:350[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGG):C4F6/Ar/O2ガス
・処理ガスの流量[sccm]:(C4F6ガス)4(5)[sccm]、(Arガス)750[sccm]、(O2ガス)3.5[sccm]
・処理時間[s]:3[s]
・処理容器12内の圧力[mTorr]:30[mTorr]
・第1の高周波電源62の高周波電力の値[W]:100[W]
・第2の高周波電源64の高周波電力の値[W]:350[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGH):Arガス
・処理ガスの流量[sccm]:750[sccm]
・処理時間[s]:4.5[s]
・処理容器12内の圧力[mTorr]:80[mTorr]
・第1の高周波電源62の高周波電力の値[W]:500[W]
・第2の高周波電源64の高周波電力の値[W]:150[W]
・電源70の直流電圧の値[V]:0[V]
・処理ガス(ガスGI):O2ガス
・処理ガスの流量[sccm]:375[sccm]
・処理時間[s]:90s]
・繰り返し回数:10回
<シーケンスSQ2>
・繰り返し回数:30回
Claims (17)
- 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有機膜と該有機膜上に設けられたマスクとを備え、該有機膜は第1の層と第2の層とによって構成され、該マスクは該第1の層上に設けられ、該第1の層は該第2の層上に設けられ、該第2の層は該被エッチング層上に設けられ、該方法は、
前記被処理体が収容されたプラズマ処理装置の処理容器内において、第1のガスのプラズマを生成し、該プラズマと前記マスクとを用いて前記第1の層を前記第2の層に至るまでエッチングした後に、該エッチングによって形成された該第1の層の側面に保護膜をコンフォーマルに形成する工程と、
前記処理容器内において、第2のガスのプラズマを生成し、該プラズマを用いて前記マスクを除去する工程と、
を備え、
前記保護膜は、酸化膜であり、
前記マスクを除去する前記工程は、前記被エッチング層をエッチングする処理の実行前に実行される、
方法。 - 前記第2のガスは、ハイドロフルオロカーボンガス、フルオロカーボンガス、塩素ガスのうち何れか一のガスを含む、請求項1に記載の方法。
- 前記第1のガスは、水素ガスと窒素ガスとを含む、
請求項1または請求項2に記載の方法。 - 前記保護膜をコンフォーマルに形成する前記工程は、前記第1の層を前記第2の層に至るまでエッチングした後において、
前記処理容器内に第3のガスを供給する工程と、
前記第3のガスを供給する前記工程の実行後に、前記処理容器内の空間をパージする工程と、
前記空間をパージする前記工程の実行後に、前記処理容器内において第4のガスのプラズマを生成する工程と、
前記第4のガスのプラズマを生成する前記工程の実行後に、前記処理容器内の空間をパージする工程と、
を含む第1シーケンスを繰り返し実行することによって、前記第1の層の前記側面に前記保護膜をコンフォーマルに形成し、
前記第3のガスを供給する前記工程は、該第3のガスのプラズマを生成しない、
請求項1〜3の何れか一項に記載の方法。 - 前記第3のガスは、アミノシラン系ガスを含む、
請求項4に記載の方法。 - 前記第3のガスは、モノアミノシランを含む、
請求項5に記載の方法。 - 前記第3のガスに含まれるアミノシラン系ガスは、1〜3個のケイ素原子を有するアミノシランを含む、
請求項5に記載の方法。 - 前記第3のガスに含まれるアミノシラン系ガスは、1〜3個のアミノ基を有するアミノシランを含む、
請求項5または請求項7に記載の方法。 - 前記第4のガスは、酸素原子を含む、
請求項4〜8の何れか一項に記載の方法。 - 前記第4のガスは、二酸化炭素ガスまたは酸素ガスを含む、
請求項9に記載の方法。 - 前記保護膜をコンフォーマルに形成する前記工程は、
前記第1シーケンスを繰り返し実行した後に前記処理容器内において第5のガスのプラズマを生成し、該第1シーケンスを繰り返し実行したことによって前記第2の層の表面に形成された膜を、該プラズマを用いて除去する工程を更に含み、
前記第5のガスは、フッ素を含む、
請求項4〜10の何れか一項に記載の方法。 - 前記第5のガスは、フルオロカーボンガスを含む、
請求項11に記載の方法。 - 前記保護膜をコンフォーマルに形成する前記工程は、前記第1の層を前記第2の層に至るまでエッチングした後であって該第1の層の前記側面に該保護膜をコンフォーマルに形成する前において、前記処理容器内でプラズマを発生させて該処理容器に設けられた上部電極に負の直流電圧を印可することにより、該第1の層に二次電子を照射する工程を備える、
請求項1〜12の何れか一項に記載の方法。 - 前記マスクを除去する前記工程の実行後において、前記処理容器内において、第6のガスのプラズマを生成し、該プラズマと前記第1の層と前記保護膜とを用いて、エッチング後の前記第1の層の形状を維持しつつ、前記第2の層を前記被エッチング層に至るまでエッチングする工程を更に備える、
請求項1〜13の何れか一項に記載の方法。 - 前記第6のガスは、窒素ガスと水素ガスとを含む、
請求項14に記載の方法。 - 前記第2の層をエッチングする前記工程の実行後において、前記被エッチング層をエッチングする工程を更に備え、
前記被エッチング層をエッチングする前記工程は、
前記処理容器内において第7のガスのプラズマを生成し、該プラズマに含まれるラジカルを含む混合層を前記被エッチング層の表面の原子層に形成する工程と、
前記混合層を形成する前記工程の実行後に、前記処理容器内の空間をパージする工程と、
前記空間をパージする前記工程の実行後に、前記処理容器内において第8のガスのプラズマを生成し、該プラズマにバイアス電圧を印加して、前記混合層を除去する工程と、
前記混合層を除去する前記工程の実行後に、前記処理容器内の空間をパージする工程と、
を含む第2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、
前記第7のガスは、フルオロカーボンガスと希ガスと酸素ガスとを含み、
前記第8のガスは、希ガスを含む、
請求項14または請求項15に記載の方法。 - 前記マスクを除去する前記工程の実行前において、前記第2の層の厚みは、10nm以上20nm以下である、
請求項1〜16の何れか一項に記載の方法。
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