JP5052771B2 - 塩基性物質拡散障壁膜を使用する微細電子素子のデュアルダマシン配線の製造方法 - Google Patents
塩基性物質拡散障壁膜を使用する微細電子素子のデュアルダマシン配線の製造方法 Download PDFInfo
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- 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
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- H01L21/76807—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 by forming openings in dielectrics for dual damascene structures
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- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02126—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
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Description
(RSiO3/2)x(HSiO3/2)y
前記式中、前記x、yは、x+y=1&0<x<y<1を満し、
前記Rは、C4−C24のアルキル、C4−C2のアルケニル、C4−C24のアルコキシ、C8−C24のアルケンオキシ、C4−C24の置換炭化水素、C1−C4の非置換炭化水素、C1−C4の置換炭化水素である。
基板上に層間絶縁膜としてOCVD OSG(k=2.9)を7000Åの厚さに形成した後、ビアを形成し、窒素系列のプラズマアッシング処理をして層間絶縁膜内に窒素、アミンなどの塩基性物質N:が残留するようにした。次いで、CVD OSG上にHSQ系物質(前記式1で、Rはオクタデシル、xは0.24、yは0.76の物質)を2000Åの厚さに形成した後、ArF用のフォトレジストをその上に形成した後、193nm波長の露光源を使用する露光及びテトラメチルアンモニウムヒドロキシド現像液を使用した現像を経てトレンチを定義するフォトレジストパターンを形成することによって、テストサンプルを準備した。
テストサンプルと対照サンプルとのフォトレジストパターンをSEMで観察した結果、テストサンプルでは良好なフォトレジストパターンが得られたが、一方、対照サンプルではフォトレジスト損傷が発生したことが分かった。
前述した本発明の第1実施例によって90nmのデザインルールで1.1μm26Tr−SRAMセルがエンベデッドされ、デュアルダマシン配線を有するロジック素子の製造工程に本発明の第1実施例を適用して、デュアルダマシン配線のトレンチを定義するフォトレジストパターンを形成した後、その結果物をSEMで測定した結果が、図24に示されている。従来とは違って、フォトレジストの損傷が全くないことが分かる。
105 下部層間絶縁膜
110 下部配線
120 エッチング停止膜
130 低誘電率層間絶縁膜
140 キャッピング膜
150 ビア
190 トレンチ
195 デュアルダマシン領域
210 デュアルダマシン配線
Claims (20)
- (a)基板上に下部配線を形成する段階と、
(b)前記下部配線上にエッチング停止膜を形成する段階と、
(c)前記エッチング停止膜上に低誘電率層間絶縁膜を形成する段階と、
(d)前記層間絶縁膜内にビアを形成する段階と、
(e)前記ビアを満たすスピンオンポリマーよりなり、前記層間絶縁膜を覆うマスク用の充填材を形成する段階と、
(f)前記充填材の上部に、HSQまたは(RSiO3/2)x(HSiO3/2)yで表示され、x+y=1であり、0<x<y<1を満足させ、RがC4−C24のアルキル、C4−C2のアルケニル、C4−C24のアルコキシ、C8−C24のアルケンオキシ、C4−C24の置換炭化水素、C1−C4の非置換炭化水素またはC1−C4の置換炭化水素であるHSQ系物質で塩基性物質拡散障壁膜を形成し、前記拡散障壁膜上に反射防止膜を形成する段階と、
(g)前記反射防止膜上に配線が形成されるトレンチ領域を定義するフォトレジストパターンを形成する段階と、
(h)前記フォトレジストパターンをエッチングマスクとして前記反射防止膜及び前記塩基性物質拡散障壁膜をエッチングして反射防止膜パターン及び拡散障壁膜パターンを形成する段階と、
(i)前記フォトレジストパターンと前記反射防止膜パターンと前記拡散障壁膜パターンとをエッチングマスクとして使用して、前記層間絶縁膜上の前記充填材をエッチングして前記拡散障壁膜パターンと前記充填材パターンとからなるマルチスタックマスクを形成する段階と、
(j)前記マルチスタックマスクをエッチングマスクとして前記層間絶縁膜を一部エッチングして、前記ビアと連結され、配線が形成されるトレンチを形成する段階と、
(k)前記マルチスタックマスク及び前記ビア内に残留する前記充填材を除去する段階と、
(l)前記ビアにより露出された前記エッチング停止膜を除去して前記下部配線を露出させる段階と、
(m)前記トレンチ及び前記ビアを配線物質で充填してデュアルダマシン配線を完成する段階と、を含むデュアルダマシン配線の製造方法。 - 前記低誘電率層間絶縁膜は、有機物と無機物とを含む、誘電率3.3以下のハイブリッド型絶縁膜である請求項1に記載のデュアルダマシン配線の製造方法。
- 前記ハイブリッド型絶縁膜は、有機シリケートガラス膜である請求項2に記載のデュアルダマシン配線の製造方法。
- 前記(c)段階は、化学気相蒸着法で行う請求項2に記載のデュアルダマシン配線の製造方法。
- 前記塩基性物質拡散障壁膜は、フォトレジスト現像液に対する溶解抑制剤をさらに備える請求項1に記載のデュアルダマシン配線の製造方法。
- 前記(d)段階は、前記エッチング停止膜を露出させる前記ビアを形成する段階である請求項1に記載のデュアルダマシン配線の製造方法。
- 前記エッチング停止膜は、SiC、SiNまたはSiCNよりなる請求項6に記載のデュアルダマシン配線の製造方法。
- 前記(d)段階前に、前記層間絶縁膜上にキャッピング膜を形成する段階をさらに含み、前記(d)段階は、前記キャッピング膜及び前記層間絶縁膜内にビアを形成する段階である請求項1に記載のデュアルダマシン配線の製造方法。
- 前記キャッピング膜は、SiO2、SiOF、SiON、SiC、SiNまたはSiCNよりなる請求項8に記載のデュアルダマシン配線の製造方法。
- 前記(i)段階時、前記フォトレジストパターン及び前記反射防止膜パターンは除去され、前記マルチスタックマスクは、前記拡散障壁膜パターンと前記充填材パターンとを含む請求項1に記載のデュアルダマシン配線の製造方法。
- 前記(h)段階は、CxFyまたはCxHyFzガスをメインエッチングガスとして使用する請求項1に記載のデュアルダマシン配線の製造方法。
- 前記(i)段階の完了後、残留する充填材の上面が前記トレンチの底より低くなるように残留させる請求項1に記載のデュアルダマシン配線の製造方法。
- 前記(i)段階時、前記フォトレジストパターンも除去される請求項1に記載のデュアルダマシン配線の製造方法。
- 前記(i)段階は、H2、N2/H2、NH3/H2、He/H2またはそれらの混合ガスをメインガスとして使用し、CxHyFzガスを補助ガスとして使用する乾式エッチングにより進行される請求項1に記載のデュアルダマシン配線の製造方法。
- 前記(j)段階時、前記拡散障壁膜パターンもエッチングされて除去される請求項1に記載のデュアルダマシン配線の製造方法。
- 前記(j)段階は、CxFyガスをメインエッチングガスとして使用する乾式エッチングにより進む請求項1に記載のデュアルダマシン配線の製造方法。
- 前記(k)段階は、水素系プラズマを使用する段階である請求項1に記載のデュアルダマシン配線の製造方法。
- 前記(l)段階の前に、前記トレンチが形成された基板を湿式エッチングする段階をさらに含む請求項1に記載のデュアルダマシン配線の製造方法。
- 前記(m)段階で前記配線は、銅配線である請求項1に記載のデュアルダマシン配線の製造方法。
- (a)基板上に下部配線を形成する段階と、
(b)前記下部配線上にエッチング停止膜を形成する段階と、
(c)前記エッチング停止膜上に有機シリケートガラス膜を形成する段階と、
(d)前記有機シリケートガラス膜内に前記エッチング停止膜を露出させるビアを形成する段階と、
(e)前記ビアを満たすスピンオンポリマーよりなり、前記有機シリケートガラス膜を覆うマスク用充填材を形成する段階と、
(f)前記充填材の上部にHSQまたは(RSiO3/2)x(HSiO3/2)yで表示され、x+y=1であり、0<x<y<1を満足させ、RがC4−C24のアルキル、C4−C2のアルケニル、C4−C24のアルコキシ、C8−C24のアルケンオキシ、C4−C24の置換炭化水素、C1−C4の非置換炭化水素またはC1−C4の置換炭化水素であるHSQ系物質で塩基性物質拡散障壁膜を形成し、前記拡散障壁膜上に反射防止膜を形成する段階と、
(g)前記反射防止膜上に配線が形成されるトレンチ領域を定義するフォトレジストパターンを形成する段階と、
(h)前記フォトレジストパターンをエッチングマスクとして前記反射防止膜及び前記塩基性物質拡散障壁膜をエッチングして反射防止膜パターン及び拡散障壁膜パターンを形成する段階と、
(i)前記フォトレジストパターンと前記反射防止膜パターンと前記拡散障壁膜パターンとをエッチングマスクとして使用して前記層間絶縁膜上の充填材をエッチングし、前記拡散障壁膜パターンと前記充填材パターンよりなるマルチスタックマスクを形成すると同時に前記フォトレジストパターン及び前記反射防止膜パターンも除去する段階と、
(j)前記マルチスタックマスクをエッチングマスクとして前記層間絶縁膜を一部エッチングして、前記ビアと連結され、配線が形成されるトレンチを形成すると同時に、前記拡散障壁膜パターンも除去する段階と、
(k)前記充填材パターンと前記ビア内に残留する前記充填材とを除去する段階と、
(l)前記結果物を湿式エッチングして残留する不純物を除去する段階と、
(m)前記ビアにより露出された前記エッチング停止膜を除去して前記下部配線を露出させる段階と、
(n)前記トレンチ及び前記ビアを配線物質で充填してデュアルダマシン配線を完成する段階と、を含むデュアルダマシン配線の製造方法。
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