JP2008124464A - Ru膜および金属配線構造の形成方法 - Google Patents
Ru膜および金属配線構造の形成方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0272—Deposition of sub-layers, e.g. to promote the adhesion of the main coating
- C23C16/0281—Deposition of sub-layers, e.g. to promote the adhesion of the main coating of metallic sub-layers
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
- C23C16/45536—Use of plasma, radiation or electromagnetic fields
- C23C16/45542—Plasma being used non-continuously during the ALD reactions
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Abstract
【解決手段】 ルテニウム(Ru)薄膜を基板上に堆積する方法は、(i)基板表面を有機金属前駆体で処理する工程と、(ii)処理した基板表面にルテニウム前駆体を吸着させる工程と、(iii)吸着させたルテニウム前駆体を励起させた還元性ガスで処理する工程と、そして(iv)工程(ii)および(iii)を繰り返すことにより、ルテニウム薄膜を基板上に形成する工程とを含む。
【選択図】図1
Description
C−Cユング等(C-C Yong et. Al.), IITC 2006, pp. 187-189, 「フィジカル・エレクトリカル・アンド・リアイアビリティ・キャラクタライゼーション・オブ・Ru・フォア・Cu・インターコネクツ」(Physical Electrical, and Reliability Characterization of Ru for Cu Interconnects)
通じ、TaNC膜などをRu膜中へと含有させることが可能となり、これによりRu膜のCu拡散バリア特性が向上する。上述の方法により形成したRu膜の厚さはわずか2nmである。これは、Ru膜中の結晶粒界へのTa原子の進入が、Cuの拡散を阻止するためであると思われる(この説明は本発明をいかなる形にも限定することを意図したものではない)。
2:上部リッド
3:分散プレート
4:排出ダクト
5:下部チャンバ
6:基板移送ゲート
7:排出ポート
8:基板ヒーター
9:基板ヒーター上下ベローズ
10:ガス導入配管
11:ガス導入部
12:ラジカル源
13:ガス分散ガイド
14:ガス分散ガイド13と分散プレート3との間の空間
15:基板
16:ラジカル源接続バルブ
17:ガス分散ガイドから排出ポートへと続くスリット
18:排出ポートへと続く空間
19:排出口への接続フランジ
20:シャワーヘッドへと続く排出バルブ
21:分散プレート3上に設けられたガス排出ポート
22:分散プレート3と基板の間にある空間
23:リングスリット
24:リングスリットに続く排出パイプ
25:高周波導入端子
26:圧力制御部
27:分子ポンプゲートバルブ
28:排出ゲートバルブ
29:分子ポンプ
30:ドライポンプ
31:ベローズ用パージガス導入バルブ
201:下層銅配線
202:銅拡散バリア膜
203:層間絶縁膜1
204:エッチストップ層
205:層間絶縁膜2
206:銅拡散バリア膜
207:バイア
208:トレンチ
209:WNxCy膜
210:Ru−ALD膜
211:Cuシード膜
212:銅配線
300:シリコン基板導入ポート
301:シリコン基板移送ユニット
302:ロードロックチャンバ
303:真空移送チャンバ
304:プレクリーニングモジュール
305:Taimata前処理モジュール
306:Ru−ALD形成モジュール
409:TaNC膜
410:Ru膜
505:Ta、TiまたはW膜を形成するためのALDモジュール
506:Ru−ALDモジュール
101:チャンバ
102:ゲートバルブ
103:排出ダクト
104:シャワープレート
105:下部ガス分散チャンバへのガス導入ポート
106:下部ガス分散チャンバからのガス排出ポート
107:下部ガス分散チャンバ
108:上部ガス分散チャンバのガス用ガイド
109:上部ガス分散チャンバの排出バルブ
110:ガス混合用センターガスパイプ
111:ガス分散プレート
112:上部ガス分散チャンバからのガス分散ポート
113:上部リッドプレート
114:基板ヒーターテーブル上下ベローズ
115:基板
120:Ru材料ガスパージバルブ
121:Ru材料ガス導入バルブ
122:ガス混合用センターガスパイプをパージするためのガス
123:材料ガス(NH3またはO2)パージガスバルブ
124:材料ガス(NH3またはO2)導入バルブ
125:排出側メインバルブ
126:圧力制御部
127:分子ポンプゲートバルブ
128:排出ゲートバルブ
129:分子ポンプ
130:ドライポンプ
131:ベローズ用パージガス導入バルブ
132:分散チャンバへと続く排出バルブ
133:Ru材料容器へのキャリアガス導入バルブ
134:Ru材料容器からのRu材料供給バルブ
135:Ru材料容器
136:Taimata材料容器へのキャリアガス導入バルブ
137:Taimata材料容器からのTaimata材料供給バルブ
139:Taimata材料容器
140:Taimata導入バルブ
611:1〜30サイクルで形成されたTaNC膜
612:Ru膜
605:Ru−PEALD、TaNCまたはTiNC−PEALDを形成することが可能なモジュール
606:Ru−PEALD、TaNCまたはTiNC−PEALDを形成することが可能なモジュール
Claims (19)
- 基板上にルテニウム(Ru)薄膜を堆積するための方法であって、
(i)前記基板の表面を有機金属前駆体で処理する工程と、
(ii)ルテニウム前駆体を前記基板の前記処理された表面に吸着させる工程と、
(iii)前記吸着させたルテニウム前駆体を励起させた還元性ガスで処理する工程と、
(iv)前記工程(ii)および(iii)を繰り返すことにより、前記基板上にルテニウム薄膜を形成する工程と、を含む方法。 - 前記工程(i)が、前記基板の表面を前記有機金属前駆体のガスに暴露することにより、前記有機金属前駆体を前記基板表面上に吸着させることを含むことを特徴とする請求項1に記載の方法。
- 前記有機金属前駆体が、Ta、Hf、Zr、NbまたはTiを含むものであることを特徴とする請求項2に記載の方法。
- 前記工程(i)が、
(a)前記有機金属前駆体を前記基板表面へと吸着させる工程と、
(b)前記吸着させた有機金属前駆体を反応性ガスで処理する工程と、
(c)前記工程(a)および(b)を繰り返すことにより、前記基板上に金属膜を形成する工程と、を含むことを特徴とする請求項1に記載の方法。 - 前記金属膜が、W、Ta、Hf、Zr、NbまたはTiを含むものであることを特徴とする請求項4に記載の方法。
- 前記金属膜が、原子層成長法(ALD)により形成されることを特徴とする請求項4に記載の方法。
- 前記金属膜が、TaN、TaNC、TiNおよびTiNCからなるグループから選択されたものであることを特徴とする請求項5に記載の方法。
- 前記ルテニウム前駆体が、非環状ジエニルを含むルテニウム錯体であることを特徴とする請求項1に記載の方法。
- 前記ルテニウム錯体が、Xa−Ru−Xbの構造を持ち、XaまたはXbの少なくとも一方が非環状ジエニルであることを特徴とする請求項8に記載の方法。
- 前記非環状ジエニルが、非環状ペンタジエニルであることを特徴とする請求項9に記載の方法。
- 前記励起させた還元性ガスが、高周波電力を還元性ガスに印加することにより活性化されることを特徴とする請求項1に記載の方法。
- 前記還元性ガスが、アンモニア、水素、または窒素および水素の混合物であることを特徴とする請求項11に記載の方法。
- 前記励起させた還元性ガスが、アンモニアプラズマまたは水素プラズマであることを特徴とする請求項11に記載の方法。
- 前記工程(ii)の後に前記ルテニウム前駆体ガスを反応炉からパージする工程と、前記工程(iii)の後に前記励起させた還元性ガスを前記反応炉からパージする工程とを、さらに含む請求項1に記載の方法。
- 前記工程(ii)および(iii)を繰り返すことにより、0.5nm以上、2.0nm以下の厚さを持つ前記ルテニウム薄膜を、原子層成長法(ALD)により形成することを特徴とする請求項1に記載の方法。
- 前記ルテニウム薄膜が、前記工程(i)により形成された下地層の上に、これと接触して形成され、前記ルテニウム薄膜の厚さが、前記下地層の厚さよりも厚いことを特徴とする請求項1に記載の方法。
- 前記工程(iv)の後に、前記基板表面を有機金属前駆体で処理する工程をさらに含み、前記工程(iv)を再開することを特徴とする請求項1に記載の方法。
- 前記有機金属前駆体が、Al、Ti、Ta、Hf、NbまたはZrを含むことを特徴とする請求項17に記載の方法。
- 前記工程(i)〜(iv)を繰り返すことにより積層構造体を形成することを特徴とする請求項1に記載の方法。
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/557,891 US20080124484A1 (en) | 2006-11-08 | 2006-11-08 | Method of forming ru film and metal wiring structure |
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| JP2008124464A true JP2008124464A (ja) | 2008-05-29 |
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| JP2007289731A Pending JP2008124464A (ja) | 2006-11-08 | 2007-11-07 | Ru膜および金属配線構造の形成方法 |
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| JP2012517101A (ja) * | 2009-02-02 | 2012-07-26 | エーエスエム アメリカ インコーポレイテッド | 導電材料の誘電体層上へのプラズマ増強原子層堆積 |
| JP5399421B2 (ja) * | 2009-01-30 | 2014-01-29 | Jx日鉱日石金属株式会社 | バリア機能を有する金属元素と触媒能を有する金属元素との合金膜を有する基板 |
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