JP5500810B2 - 多層配線構造に空隙を形成する方法 - Google Patents
多層配線構造に空隙を形成する方法 Download PDFInfo
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- JP5500810B2 JP5500810B2 JP2008263151A JP2008263151A JP5500810B2 JP 5500810 B2 JP5500810 B2 JP 5500810B2 JP 2008263151 A JP2008263151 A JP 2008263151A JP 2008263151 A JP2008263151 A JP 2008263151A JP 5500810 B2 JP5500810 B2 JP 5500810B2
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Description
[0001]本発明の実施形態は概して集積回路の製作に関する。より具体的には、本発明の実施形態は、低誘電定数を有する誘電材料を含む多層配線構造を形成する方法に関する。
[0002]集積回路形状は、このようなデバイスが数十年前に最初に導入されて以来、劇的に縮小している。これ以来、集積回路は概して(しばしばムーアの法則と称される)18ヶ月サイズルールに従っており、これは、2年ごとにチップのデバイス数が2倍になるということを意味している。今日の製作設備は、0.1μm形状サイズを有するデバイスを定期的に製造しており、将来の設備はやがて、より小型の形状サイズを有するデバイスを製造しているだろう。
[0020]図1A〜図1Jは、本発明の実施形態に従って多層配線構造を形成する処理シーケンス中の基板スタックの断面図を概略的に図示している。図4は、図1A〜図1Jに示されている処理シーケンスに従ったプロセス200を図示している。
[0035]シリコンカーバイドを有する多孔性誘電バリアを堆積するためのPECVD堆積プロセスは、トリメチルシラン(TMS、(CH3)3SiH)およびエチレン(C2H4)の組み合わせを備える前駆体を使用するステップを備えている。TMS/エチレン比を含むプロセス条件は、炭素の原子パーセンテージが15%以上になるように設定される。一実施形態では、エチレン/TMS比は約1:1〜約8:1であり、TMS/エチレン前駆体およびキャリアガスの流量は約5sccm〜約10,000sccmであり、温度は約350℃でる。これらの条件について、チャンバ圧力は約10ミリトール〜約1気圧であり、プラズマ生成の無線周波数(RF)電力は約15W〜約3,000Wであり、処理中の基板に前駆体を提供するように構成されている、基板とシャワーヘッド間の間隔は約200ミル〜約2000ミルである。
[0052]本発明の実施形態はまた、導電ライン間のトレンチに非コンフォーマル誘電層を堆積することによって空隙を生成する方法を提供する。角度付き側壁を具備するトレンチは、コントロールエッチングプロセスによって誘電層に形成されてもよい。側壁は、トレンチが底部より広い開口を有するように角度が付けられている。コンフォーマル誘電バリアが、ウェットエッチング化学薬品からのバリアを提供するためにトレンチ表面に堆積される。角度付き側壁を具備するトレンチは次いで、導電ラインを形成する導電材料で充填される。導電ライン周辺の誘電層は除去されて、導電ライン間に逆トレンチを残す。導電ライン間の逆トレンチは、底部より狭い開口を具備する角度付き側壁を有する。非コンフォーマル誘電層は次いで、導電ライン間のトレンチに堆積される。堆積プロセスは、空隙が狭いトレンチ内に形成するようにコントロールされてもよい。固体誘電層が形成されるが、この場合トレンチは広い。したがって、空隙形成は、マスクを使用せずに当然選択的である。2つの例示的処理シーケンスについて後述する。
[0053]図2A〜図2Jは、本発明の一実施形態に従って多層配線構造を形成する処理シーケンス240中の基板スタックの断面図を概略的に図示している。図5は、図2A〜図2Jに示されている処理シーケンス240に従った処理ステップを図示している。
[0074]図3A〜図3Fは、本発明の別の実施形態に従って多層配線構造を形成する処理シーケンス280中の基板スタックの断面図を概略的に図示している。図6は、図3A〜図3Fに示されている処理シーケンス280に従った処理ステップを図示している。
Claims (10)
- 半導体構造に導電ラインを形成する方法であって、
第1の誘電層にトレンチを形成するステップと、
前記トレンチにコンフォーマル低k誘電バリア膜を堆積するステップであって、前記コンフォーマル低k誘電バリア膜がプラズマ化学気相堆積(PECVD)プロセスにより形成された窒化ホウ素(BN)膜を備え、前記コンフォーマル低k誘電バリア膜を堆積するステップが、
ホウ素含有前駆体からホウ素含有膜を形成する工程と、
窒素を前記ホウ素含有膜に取り込んで窒化ホウ素膜を形成するために、前記ホウ素含有膜を窒素含有前駆体で処置する工程と、を備えるステップと、
前記コンフォーマル低k誘電バリア膜上に金属拡散バリア膜を堆積するステップと、
前記トレンチを充填するために導電材料を堆積するステップと、
前記第1の誘電層を露出するために前記導電材料を平坦化するステップと、
前記導電材料上に自己整合型キャップ層を形成するステップと、
ウェットエッチング化学薬品を使用して前記第1の誘電層を除去するステップであって、前記コンフォーマル低k誘電バリア膜の前記窒化ホウ素膜が、前記ウェットエッチング化学薬品に対する前記導電材料のバリアとして作用するステップと、
を備える方法。 - 前記第1の誘電層を除去する前に、前記導電材料および前記第1の誘電層上に多孔性誘電バリアを堆積するステップであって、前記第1の誘電層が、前記多孔性誘電バリアを介して前記ウェットエッチング化学薬品を使用して除去されるステップをさらに備える、請求項1に記載の方法。
- 前記多孔性誘電バリアが、シリコンカーバイド(SiC)結合、窒化シリコンカーバイド(SiCN)結合またはこれらの組み合わせを備えており、かつシリコン酸素結合を具備していない、請求項2に記載の方法。
- 前記多孔性誘電バリアを堆積するステップが、トリメチルシラン(TMS、(CH3)3SiH)およびエチレン(C2H4)の組み合わせを備える前駆体を使用してシリコンカーバイド層を堆積する工程を備える、請求項3に記載の方法。
- 前記第1の誘電層を除去した後に非コンフォーマル誘電層を堆積するステップをさらに備えており、前記トレンチを形成するステップが角度付き側壁を具備するトレンチを形成する工程を備えており、前記トレンチが底部では狭くかつ開口では広く、前記第1の誘電層を除去するステップが前記導電材料周辺に逆トレンチを形成し、前記非コンフォーマル誘電層を堆積するステップが、特定の値より大きなアスペクト比を有する前記逆トレンチに空隙を形成する、請求項1に記載の方法。
- 前記トレンチの対向する角度付き側壁間の角度は約5°〜130°である、請求項5に記載の方法。
- 前記非コンフォーマル誘電層を堆積する前に前記逆トレンチ上にコンフォーマル誘電バリア膜を堆積するステップをさらに備える、請求項5に記載の方法。
- 空隙を有する誘電構造を形成する方法であって、
第1の誘電層にトレンチを形成するステップであって、前記トレンチが導電材料をこの中に保有するように構成されているステップと、
前記トレンチに第1のコンフォーマル誘電バリア膜を堆積するステップであって、前記第1のコンフォーマル誘電バリア膜がプラズマ化学気相堆積(PECVD)プロセスにより形成された窒化ホウ素(BN)膜を備え、前記窒化ホウ素膜が5未満のk値を有し、前記第1のコンフォーマル誘電バリア膜を堆積するステップが、
ホウ素含有前駆体からホウ素含有膜を形成する工程と、
窒素を前記ホウ素含有膜に取り込んで窒化ホウ素膜を形成するために、前記ホウ素含有膜を窒素含有前駆体で処置する工程と、を備えるステップと、
前記トレンチを充填するために第1の導電材料を堆積するステップと、
前記第1の誘電層を露出するために前記第1の導電材料を平坦化するステップと、
前記導電材料上に第1の自己整合型キャップ層を形成するステップと、
前記第1の導電材料および前記第1の誘電層上に第1の多孔性誘電バリアを堆積するステップと、
前記第1の多孔性誘電バリアを介してウェットエッチング溶液を使用して前記第1の誘電層を除去することによって前記トレンチ間に空隙を形成するステップであって、前記第1のコンフォーマル誘電バリア膜が前記ウェットエッチング溶液に対するバリアおよびエッチングストップとして作用するステップと、
を備える方法。 - 前記第1の多孔性誘電バリアが、シリコンカーバイド(SiC)結合、窒化シリコンカーバイド(SiCN)結合またはこれらの組み合わせを備えており、また一酸化シリコン(SiO)を具備していない、請求項8に記載の方法。
- 空隙を有する誘電構造を形成する方法であって、
第1の誘電層にトレンチを形成するステップであって、角度付き側壁を具備する前記トレンチが底部で狭くかつ開口で広いステップと、
前記トレンチに第1のコンフォーマル誘電バリア膜を堆積するステップあって、前記第1のコンフォーマル誘電バリア膜がプラズマ化学気相堆積(PECVD)プロセスにより形成された窒化ホウ素(BN)膜を備え、前記窒化ホウ素膜が5未満のk値を有し、前記第1のコンフォーマル誘電バリア膜を堆積するステップが、
ホウ素含有前駆体からホウ素含有膜を形成する工程と、
窒素を前記ホウ素含有膜に取り込んで窒化ホウ素膜を形成するために、前記ホウ素含有膜を窒素含有前駆体で処置する工程と、を備えるステップと、
前記トレンチを充填するために第1の導電材料を堆積するステップと、
前記第1の誘電層を露出するために前記第1の導電材料を平坦化するステップと、
前記第1の導電材料周辺に逆トレンチを形成するために前記第1の誘電層を除去するステップであって、前記逆トレンチが角度付き側壁を有しており、また開口で狭くかつ底部で広いステップと、
前記逆トレンチに第1の非コンフォーマル誘電層を堆積することによって空隙を形成するステップであって、前記空隙が、少なくとも部分的に、特定の値より大きなアスペクト比を有する前記逆トレンチに形成されるステップと、
を備える方法。
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KR101027216B1 (ko) | 2011-04-06 |
US20090093100A1 (en) | 2009-04-09 |
TW200939394A (en) | 2009-09-16 |
CN101431047B (zh) | 2011-03-30 |
KR20090036524A (ko) | 2009-04-14 |
CN101431047A (zh) | 2009-05-13 |
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