JP5568845B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP5568845B2 JP5568845B2 JP2008172166A JP2008172166A JP5568845B2 JP 5568845 B2 JP5568845 B2 JP 5568845B2 JP 2008172166 A JP2008172166 A JP 2008172166A JP 2008172166 A JP2008172166 A JP 2008172166A JP 5568845 B2 JP5568845 B2 JP 5568845B2
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- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76877—Filling of holes, grooves or trenches, e.g. vias, with conductive material
- H01L21/76883—Post-treatment or after-treatment of the conductive material
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- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76822—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc.
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76822—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc.
- H01L21/76826—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc. by contacting the layer with gases, liquids or plasmas
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76843—Barrier, adhesion or liner layers formed in openings in a dielectric
- H01L21/76846—Layer combinations
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76843—Barrier, adhesion or liner layers formed in openings in a dielectric
- H01L21/76849—Barrier, adhesion or liner layers formed in openings in a dielectric the layer being positioned on top of the main fill metal
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- H—ELECTRICITY
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76853—Barrier, adhesion or liner layers characterized by particular after-treatment steps
- H01L21/76855—After-treatment introducing at least one additional element into the layer
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76853—Barrier, adhesion or liner layers characterized by particular after-treatment steps
- H01L21/76855—After-treatment introducing at least one additional element into the layer
- H01L21/76856—After-treatment introducing at least one additional element into the layer by treatment in plasmas or gaseous environments, e.g. nitriding a refractory metal liner
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/7687—Thin films associated with contacts of capacitors
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Description
導体装置の製造方法に関する。
装置の製造方法を提供することにある。
体キャパシタを有する半導体装置の製造方法を提供することができる。
本発明の一実施形態による半導体装置及びその製造方法について図1乃至図20を用いて説明する。図1は、本実施形態による半導体装置の構造を示す断面図である。図2乃至図20は、本実施形態による半導体装置の製造方法を示す工程断面図である。
まず、本実施形態による半導体装置について図1を用いて説明する。
次に、本実施形態による半導体装置の製造方法について図2乃至図20を用いて説明する。
本発明は上記実施形態に限らず種々の変形が可能である。
前記絶縁膜に埋め込まれた導体プラグと、
前記導体プラグ上及び前記絶縁膜上に形成された上面が平坦な下地導電膜と、
前記下地導電膜上に形成された強誘電体キャパシタと、
を有し、
前記下地導電膜中の窒素濃度は、少なくとも前記導体プラグ上の領域において、上面側から内部に向けて徐々に低くなっている
ことを特徴とする半導体装置。
前記下地導電膜は、前記導体プラグ上の領域において、上層部のみが窒化されている
ことを特徴とする半導体装置。
前記導体プラグの上面は、前記絶縁膜の上面よりも低い
ことを特徴とする半導体装置。
前記下地導電膜は、前記絶縁膜上の領域において下層部が窒化されている
ことを特徴とする半導体装置。
前記下地導電膜中の窒素濃度は、前記絶縁膜上の領域において、上面側から内部に向けて徐々に低くなるとともに、下面側から内部に向けて徐々に低くなっている
ことを特徴とする半導体装置。
前記導体プラグ上の領域における前記下地導電膜中の窒素濃度は、前記絶縁膜上の領域における前記下地導電膜中の窒素濃度よりも低い
ことを特徴とする半導体装置。
前記絶縁膜は、窒素を含んでいる
ことを特徴とする半導体装置。
前記絶縁膜中の窒素濃度は、上面側から内部に向けて徐々に低くなっている
ことを特徴とする半導体装置。
前記下地導電膜は、チタン又はタンタルを含む
ことを特徴とする半導体装置。
前記下地導電膜と前記強誘電体キャパシタとの間に形成され、上層部が窒化された他の下地導電膜を更に有する
ことを特徴とする半導体装置。
前記絶縁膜に導体プラグを埋め込む工程と、
前記導体プラグ上及び前記絶縁膜上に高融点金属膜を形成する工程と、
前記高融点金属膜の上面を研磨することにより、前記高融点金属膜の上面を平坦化する工程と、
窒素を含む雰囲気中で熱処理を行うことにより、前記高融点金属膜を窒化して下地導電膜とする工程と、
前記下地導電膜上に、強誘電体キャパシタを形成する工程と
を有することを特徴とする半導体装置の製造方法。
請求項11記載の半導体装置の製造方法において、
前記下地導電膜は、前記導体プラグ上の領域において、上層部のみが窒化される
ことを特徴とする半導体装置の製造方法。
前記高融点金属膜の上面を平坦化する工程では、前記絶縁膜が露出するまで前記高融点金属膜を研磨する
ことを特徴とする半導体装置の製造方法。
前記絶縁膜に前記導体プラグを埋め込む工程の後、前記高融点金属膜を形成する工程の前に、前記絶縁膜中に窒素を拡散させる工程を更に有し、
前記下地導電膜を形成する工程では、前記絶縁膜中に拡散させた窒素により、前記高融点金属膜の下層部を更に窒化する
ことを特徴とする半導体装置の製造方法。
前記絶縁膜中に窒素を拡散させる工程では、窒素を含むプラズマに前記絶縁膜の上面を曝露することにより、前記絶縁膜中に窒素を拡散させる
ことを特徴とする半導体装置の製造方法。
前記窒素を含むプラズマは、NH3プラズマ又はN2プラズマを含む
ことを特徴とする半導体装置の製造方法。
前記絶縁膜に前記導体プラグを埋め込む工程の後、前記絶縁膜中に窒素を拡散させる工程の前に、前記絶縁膜の上面をプラズマでスパッタする工程を更に有する
ことを特徴とする半導体装置の製造方法。
前記下地導電膜は、チタン又はタンタルを含む
ことを特徴とする半導体装置の製造方法。
前記下地導電膜を形成する工程の後、前記強誘電体キャパシタを形成する工程の前に、前記下地導電膜上に他の高融点金属膜を形成する工程と;窒素を含む雰囲気中で熱処理を行うことにより、上層部が窒化された前記他の高融点金属膜である他の下地導電膜を形成する工程とを更に有する
ことを特徴とする半導体装置の製造方法。
前記下地導電膜を形成する工程の後、前記他の高融点金属膜を形成する工程の前に、前記下地導電膜の上面を、NH3プラズマを含むプラズマに曝露する工程を更に有する
ことを特徴とする半導体装置の製造方法。
12…素子分離領域
14…ウェル
16…ゲート絶縁膜
18…ゲート電極
20…サイドウォール絶縁膜
22…ソース/ドレイン拡散層
24a、24b…ソース/ドレイン電極
26…トランジスタ
28…カバー絶縁膜
30…層間絶縁膜
32…コンタクトホール
34…密着層
36…導体プラグ
38…酸化防止膜
40…層間絶縁膜
42…コンタクトホール
44…密着層
46…導体プラグ
48…凹部
50…Ti膜
51…酸化物層
52…第1の下地導電膜
54…Ti膜
56…第2の下地導電膜
58…酸素バリア膜
60…下部電極
62…強誘電体膜
62a…初期層
62b…コア層
62c…表層部
64…第1の導電膜
66…第2の導電膜
68…第3の導電膜
70…上部電極
72…強誘電体キャパシタ
74…水素バリア膜
76…水素バリア膜
78…層間絶縁膜
80…水素バリア膜
82…層間絶縁膜
84…コンタクトホール
86…密着層
88…導体プラグ
90…コンタクトホール
92…密着層
94…導体プラグ
96…配線
98…TiN膜
100…シリコン酸化膜
102…ハードマスク
Claims (5)
- 半導体基板の上方に絶縁膜を形成する工程と、
前記絶縁膜に導体プラグを埋め込む工程と、
前記導体プラグ上及び前記絶縁膜上に高融点金属膜を形成する工程と、
前記高融点金属膜の上面を研磨することにより、前記高融点金属膜の上面を平坦化する工程と、
前記高融点金属膜の上面を平坦化する工程を行った後に、窒素を含む雰囲気中で熱処理を行うことにより、前記高融点金属膜を窒化して下地導電膜とする工程と、
前記下地導電膜上に、強誘電体キャパシタを形成する工程とを有し、
前記下地導電膜中の窒素濃度は、前記導体プラグ上の領域において上面側から内部に向けて徐々に低くなっており、
前記下地導電膜と前記導体プラグとの界面の窒素濃度は、前記下地導電膜と前記絶縁膜との界面の窒素濃度よりも低くなっている
ことを特徴とする半導体装置の製造方法。 - 請求項1記載の半導体装置の製造方法において、
前記下地導電膜は、前記導体プラグ上の領域において、上層部のみが窒化される
ことを特徴とする半導体装置の製造方法。 - 請求項1又は2記載の半導体装置の製造方法において、
前記高融点金属膜の上面を平坦化する工程では、前記絶縁膜が露出するまで前記高融点金属膜を研磨する
ことを特徴とする半導体装置の製造方法。 - 請求項1乃至3のいずれか1項に記載の半導体装置の製造方法において、
前記絶縁膜に前記導体プラグを埋め込む工程の後、前記高融点金属膜を形成する工程の前に、前記絶縁膜中に窒素を拡散させる工程を更に有し、
前記下地導電膜を形成する工程では、前記絶縁膜中に拡散させた窒素により、前記高融点金属膜の下層部を更に窒化する
ことを特徴とする半導体装置の製造方法。 - 請求項1乃至4のいずれか1項に記載の半導体装置の製造方法において、
前記下地導電膜は、チタン又はタンタルを含む
ことを特徴とする半導体装置の製造方法。
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Application Number | Priority Date | Filing Date | Title |
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JP2008172166A JP5568845B2 (ja) | 2008-07-01 | 2008-07-01 | 半導体装置の製造方法 |
US12/495,211 US8120087B2 (en) | 2008-07-01 | 2009-06-30 | Ferroelectric capacitor with underlying conductive film |
US13/345,948 US20120107965A1 (en) | 2008-07-01 | 2012-01-09 | Semiconductor device and method for manufacturing the same |
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JP2008172166A JP5568845B2 (ja) | 2008-07-01 | 2008-07-01 | 半導体装置の製造方法 |
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JP2010016036A JP2010016036A (ja) | 2010-01-21 |
JP5568845B2 true JP5568845B2 (ja) | 2014-08-13 |
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JP4320679B2 (ja) * | 2007-02-19 | 2009-08-26 | セイコーエプソン株式会社 | 強誘電体メモリ装置の製造方法 |
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US8120087B2 (en) | 2012-02-21 |
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US20100001325A1 (en) | 2010-01-07 |
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