JP2007103942A - 炭素系ハードマスクを開く方法 - Google Patents
炭素系ハードマスクを開く方法 Download PDFInfo
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Abstract
【解決手段】 好ましくは少なくとも60%の炭素及び10から40%の水素を含むアモルファス炭素で構成され且つ誘電体層16の上に横たわる炭素系ハードマスク層(18)を開く方法。ハードマスクは、H、N及びCOで構成されるエッチングガスを使用するプラズマエッチングにより開かれる。エッチングは、HFバイアスされるペデスタル電極と、容量性VHFバイアスされるシャワーヘッドとを有するプラズマエッチングリアクタにおいて実行されるのが好ましい。
【選択図】 図1
Description
ハードマスクを開くプロセスは、APF層を300mmシリコンウェハ上に400℃で900nmの厚みに成長させ、その後、ARC層及びパターン化フォトレジストで覆うように最適化した。300mmウェハ用に構成された図2のエッチングチャンバーにウェハを入れる。ペデスタル電極が13.56MHzのRF電源の600Wでバイアスされる間に200sccmのCF4が150ミリトールの圧力で供給される従来のエッチングによりARC層を除去する。
第2の実施例では、内側コイルに供給する電流を2Aに減少したが、外側コイルへの電流は5Aのままとする。他の条件は、第1の実施例と同じままにする。平均エッチングレートは、469nm/分に増加したが、非均一性も11.5%に増加することが観察される。
第3の実施例では、162MHz電源を2000Wに増加したが、他の条件は、第1の実施例と同じままにする。平均エッチングレートは、約549nm/分であり、非均一性が3.1%に減少することが観察される。
第4の実施例では、162MHz電源を2000Wにセットし、N2の供給を300sccmに増加する一方、H2の供給を300sccmに減少する。その他は、第1実施例の条件を使用する。平均エッチングレートは、516.5nmで、非均一性は2.1%であることが観察される。ウェハにわたりホールプロフィールに若干の非均一性がある。
第5の実施例では、2つのプロセス条件を比較して、窒素と酸素の比を変化させることの作用を決定する。1組のテストでは、水素の流量が450sccmで、窒素の流量が150sccmである。他の組では、水素の流量が300sccmで、窒素の流量が300sccmである。即ち、主としてエッチングの役割を果たすと考えられる2つのガスの合計流量を同じに維持する。一酸化炭素は、主として、側壁を不動態化し、ひいては、プロフィールを改善するのに有用であると考えられる。
第7の実施例では、内側ゾーンと外側ゾーンとの間のプロセスガスの流量比を変化させる一方、その他は、第1実施例のプロセス条件を維持する。図4のチャートの結果は、ウェハ上の6つのポイントにおけるBCDを、外側ゾーンにプロセスガスがない場合、及び外側と内側の流量の比が1/4、1、及び4の場合について示している。縁の流量が多いと、特に中心におけるBCDを増加するが、プロフィールの頂部における残留ポリマーを解決することが明らかである。この作用は、中心に供給されるガスが少なく、ポンピングが増加することから得られる。又、ガス滞留時間も増加する。又、縁の流量が高くなると、均一性も改善される。一般に、1/2から2の流量比は、良好な結果を生じるが、1の流量比におけるAPFは、約10%低くなる。
第8の実施例では、チャンバー圧力を変化するが、その他は、第1実施例の条件に従う。図5の結果は、50ミリトールより高い圧力において、垂直プロフィールが改善され、且つBCDの均一性が著しく改善されることを示している。異なる仕方で最適化されるレシピに対して、最適な圧力範囲の最小値を20ミリトールに減少できると考えられる。
Claims (19)
- 基板上に形成されて、少なくとも40at%の炭素を含む炭素系の層をエッチングする方法において、上記炭素系の層を、水素、窒素及び一酸化炭素を含むエッチングガスのプラズマに露出させるステップを備えた方法。
- 上記炭素系の層は、少なくとも60at%の炭素を含む、請求項1に記載の方法。
- 上記炭素系の層は、10から40at%の水素を含む、請求項2に記載の方法。
- 上記炭素系の層は、10から40at%の水素を含む、請求項1に記載の方法。
- 上記エッチングガスの活性成分は、本質的に、水素、窒素及び一酸化炭素より成る、請求項1に記載の方法。
- 上記エッチングガスは、本質的に、水素、窒素及び一酸化炭素より成る、請求項1に記載の方法。
- 上記水素の流れは、上記窒素の流れの50%から300%である、請求項1から6のいずれかに記載の方法。
- 上記炭素系の層の上に形成されたフォトレジスト層を光学的にパターン化するステップを更に備えた、請求項1から6のいずれかに記載の方法。
- エッチングされた炭素系の層をハードマスクとして使用して上記炭素系の層の下に横たわる誘電体層をエッチングするステップを更に備えた、請求項8に記載の方法。
- 上記基板をプラズマエッチングチャンバーに入れるステップを更に備え、該プラズマエッチングチャンバーは、基板を支持するペデスタル電極であって、HF周波数で動作するRF電源によりマッチング回路を経てバイアスされるペデスタル電極と、該ペデスタルに対向し、エッチングガスが貫通供給されるシャワーヘッド電極であって、上記HF周波数より高いVHF周波数で動作し且つシャワーヘッド電極に容量性結合されたスタブ回路に適用される第2のRF電源によりバイアスされるようなシャワーヘッド電極とを有する、請求項1から6のいずれかに記載の方法。
- 上記シャワーヘッドの後方において上記チャンバーの中心軸から異なる半径に配置された2つの同軸コイルを経て電流を通過させるステップを更に備えた、請求項10に記載の方法。
- 上記基板をプラズマエッチングチャンバーに入れ、該チャンバーの圧力をエッチング中に50ミリトールより高く維持するステップを更に備えた、請求項1から6のいずれかに記載の方法。
- 上記チャンバーの圧力は、エッチング中に20ミリトール以下である、請求項12に記載の方法。
- 誘電体層と、該誘電体層の上に横たわり、少なくとも40at%の炭素及び10から60at%の水素を含む炭素系の層とを備えた誘電体層構造体をエッチングする方法において、
上記炭素系の層の上に横たわるフォトレジスト層をパターン化するステップと、
上記フォトレジスト層のパターン化に基づき水素ガス、窒素ガス及び一酸化炭素ガスを含むエッチングガスで上記炭素系の層をプラズマエッチングする第1ステップと、
フルオロカーボンを含むエッチングガスで上記プラズマエッチングされた炭素系の層を通して上記誘電体層をプラズマエッチングする第2ステップと、
を備えた方法。 - 上記炭素系の層は、少なくとも60at%の炭素と、10から40at%の水素とを含む、請求項14に記載の方法。
- 上記炭素系の層は、厚みが少なくとも400nmである、請求項15に記載の方法。
- 上記第1及び第2ステップは、誘電体層構造体が形成される基板を支持するRFバイアスされるペデスタル電極と、エッチングガスが貫通して流れると共に、VHF電源により容量性バイアスされるシャワーヘッド電極とを有するプラズマエッチングリアクタにおいて実行される、請求項14から16のいずれかに記載の方法。
- 上記誘電体層構造体は、上記炭素系の層の上に横たわる反射防止層であって、その上にフォトレジスト層がパターン化される反射防止層も含み、更に、該反射防止層をプラズマエッチングする第3ステップを備えた、請求項14から16のいずれかに記載の方法。
- 上記第1、第2及び第3ステップは、誘電体層構造体が形成される基板を支持するRFバイアスされるペデスタル電極と、エッチングガスが貫通して流れると共に、VHF電源により容量性バイアスされるシャワーヘッド電極とを有するプラズマエッチングリアクタにおいて実行される、請求項14から16のいずれかに記載の方法。
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US11/244,422 US7432210B2 (en) | 2005-10-05 | 2005-10-05 | Process to open carbon based hardmask |
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TWI320203B (en) | 2010-02-01 |
CN1953146A (zh) | 2007-04-25 |
KR20070038444A (ko) | 2007-04-10 |
KR101318898B1 (ko) | 2013-10-17 |
JP5265100B2 (ja) | 2013-08-14 |
US7432210B2 (en) | 2008-10-07 |
TW200717649A (en) | 2007-05-01 |
US20080286977A1 (en) | 2008-11-20 |
KR20130100072A (ko) | 2013-09-09 |
US20070077780A1 (en) | 2007-04-05 |
CN1953146B (zh) | 2011-04-13 |
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