JP2008186926A - 半導体装置とその製造方法 - Google Patents
半導体装置とその製造方法 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 89
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- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 3
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Abstract
【解決手段】第1ホールの21a内面と、該第1ホール21aに露出する金属シリサイドパターン(導電パターン)17aの上面に、高融点金属よりなる第1バリアメタル膜22aを形成する工程と、第1バリアメタル膜22aの上に、高融点金属の窒化物よりなる第2バリアメタル膜22bを形成する工程と、第2バリアメタル膜22bをアニールする工程と、アニールの後に、第2バリアメタル膜22bの上にプラグ用導電膜23を形成する工程と、プラグ用導電膜23、及び第1、第2バリアメタル膜22a、22bを第1ホール21a内に第1導電性プラグ24として残す工程とを有する半導体装置の製造方法による。
【選択図】図5
Description
前記半導体基板と前記導電パターンの上に形成され、該導電パターンの上にホールを備えた絶縁膜と、
前記ホール内に形成され、高融点金属を含む第1バリアメタル膜、高融点金属の窒化物よりなる第2バリアメタル膜、及びプラグ用導電膜を順に形成してなる導電性プラグとを有し、
前記第1バリアメタル膜における窒素濃度が該第1バリアメタルの上面から下面に向かって単調に減少し、且つ、該下面における窒素濃度が、前記導電パターンの上面における窒素濃度よりも高いことを特徴とする半導体装置。
前記半導体基板と前記導電パターンの上に第1絶縁膜を形成する工程と、
前記導電パターンの上の前記第1絶縁膜に第1ホールを形成する工程と、
前記第1ホールの内面と、該第1ホールに露出する前記導電パターンの上面に、高融点金属よりなる第1バリアメタル膜を形成する工程と、
前記第1バリアメタル膜の上に、高融点金属の窒化物よりなる第2バリアメタル膜を形成する工程と、
前記第2バリアメタル膜をアニールする工程と、
前記アニールの後に、前記第2バリアメタル膜の上にプラグ用導電膜を形成する工程と、
を有することを特徴とする半導体装置の製造方法。
前記第1バリアメタル膜をアニールする工程における最高基板温度と、前記第2バリアメタル膜をアニールする工程における最高基板温度の少なくとも一方を、前記金属シリサイドパターンを形成するときの最高基板温度よりも低くすることを特徴とする付記7に記載の半導体装置の製造方法。
前記半導体基板を加熱しながら金属膜をシリコンと反応させて金属シリサイド膜を形成する工程と、
前記金属膜の未反応部分を除去し、残された前記金属シリサイド膜を前記金属シリサイドパターンとする工程と、
前記金属シリサイドパターンをアニールして低抵抗化する工程とを含むことを特徴とする付記9に記載の半導体装置の製造方法。
前記チタンシリサイドパターンを形成する場合、前記第2バリアメタル膜をアニールする工程における前記最高基板温度を800℃以下とし、
前記コバルトシリサイドパターンを形成する場合、前記第2バリアメタル膜をアニールする工程における前記最高基板温度を840℃以下とすることを特徴とする付記9に記載の半導体装置の製造方法。
前記不純物領域上に前記金属シリサイドパターンを形成することを特徴とする付記9に記載の半導体装置の製造方法。
前記半導体パターンの表層に前記シリサイドパターンを形成することを特徴とする付記9に記載の半導体装置の製造方法。
前記第1絶縁膜の上に第1導電膜を形成する工程と、
前記第1導電膜の上に強誘電体膜を形成する工程と、
前記強誘電体膜の上に第2導電膜を形成する工程と、
前記第1導電膜、前記強誘電体膜、及び前記第2導電膜をパターニングして、それぞれ前記下部電極、前記キャパシタ誘電体膜、及び前記上部電極を形成する工程とを有することを特徴とする付記17に記載の半導体装置の製造方法。
前記キャパシタと前記第1絶縁膜のそれぞれの上に第2絶縁膜を形成する工程と、
前記第1導電性プラグの上の前記第2絶縁膜に第2ホールを形成する工程と、
前記第2ホール内に、前記第1導電性プラグと電気的に接続された第2導電性プラグを形成する工程とを更に有することを特徴とする付記17に記載の半導体装置の製造方法。
Claims (10)
- 半導体基板上に形成された導電パターンと、
前記半導体基板と前記導電パターンの上に形成され、該導電パターンの上にホールを備えた絶縁膜と、
前記ホール内に形成され、高融点金属を含む第1バリアメタル膜、高融点金属の窒化物よりなる第2バリアメタル膜、及びプラグ用導電膜を順に形成してなる導電性プラグとを有し、
前記第1バリアメタル膜における窒素濃度が該第1バリアメタルの上面から下面に向かって単調に減少し、且つ、該下面における窒素濃度が、前記導電パターンの上面における窒素濃度よりも高いことを特徴とする半導体装置。 - 前記絶縁膜の上に、下部電極、強誘電体材料よりなるキャパシタ誘電体膜、及び上部電極を備えたキャパシタが形成されたことを特徴とする請求項1に記載の半導体装置。
- 半導体基板上に導電パターンを形成する工程と、
前記半導体基板と前記導電パターンの上に第1絶縁膜を形成する工程と、
前記導電パターンの上の前記第1絶縁膜に第1ホールを形成する工程と、
前記第1ホールの内面と、該第1ホールに露出する前記導電パターンの上面に、高融点金属よりなる第1バリアメタル膜を形成する工程と、
前記第1バリアメタル膜の上に、高融点金属の窒化物よりなる第2バリアメタル膜を形成する工程と、
前記第2バリアメタル膜をアニールする工程と、
前記アニールの後に、前記第2バリアメタル膜の上にプラグ用導電膜を形成する工程と、
を有することを特徴とする半導体装置の製造方法。 - 前記第2バリアメタル膜をアニールする工程は、酸素が排除された窒素含有雰囲気中で行われることを特徴とする請求項3に記載の半導体装置の製造方法。
- 前記第2バリアメタル膜を形成する工程の前に、前記第1バリアメタル膜をアニールする工程を有することを特徴とする請求項3に記載の半導体装置の製造方法。
- 前記第2バリアメタル膜をアニールする工程における最高基板温度を、前記第1バリアメタル膜をアニールする工程における最高基板温度よりも高くすることを特徴とする請求項5に記載の半導体装置の製造方法。
- 前記導電パターンとして金属シリサイドパターンを形成し、
前記第1バリアメタル膜をアニールする工程における最高基板温度と、前記第2バリアメタル膜をアニールする工程における最高基板温度の少なくとも一方を、前記金属シリサイドパターンを形成するときの最高基板温度よりも低くすることを特徴とする請求項5に記載の半導体装置の製造方法。 - 前記金属シリサイドパターンを形成する工程は、
前記半導体基板を加熱しながら金属膜をシリコンと反応させて金属シリサイド膜を形成する工程と、
前記金属膜の未反応部分を除去し、残された前記金属シリサイド膜を前記金属シリサイドパターンとする工程とを含むことを特徴とする請求項7に記載の半導体装置の製造方法。 - 前記第2バリアメタル膜をCVD法で形成することを特徴とする請求項3に記載の半導体装置の製造方法。
- 前記第1絶縁膜の上に、下部電極、強誘電体材料よりなるキャパシタ誘電体膜、及び上部電極を備えたキャパシタを形成する工程を更に有することを特徴とする請求項3に記載の半導体装置の製造方法。
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JP2011082235A (ja) * | 2009-10-05 | 2011-04-21 | Toshiba Corp | 半導体装置及びその製造方法 |
JP2015056601A (ja) * | 2013-09-13 | 2015-03-23 | 株式会社東芝 | 半導体装置およびその製造方法 |
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