JP2007019187A - 半導体集積回路装置および半導体集積回路装置の製造方法 - Google Patents
半導体集積回路装置および半導体集積回路装置の製造方法 Download PDFInfo
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- JP2007019187A JP2007019187A JP2005197938A JP2005197938A JP2007019187A JP 2007019187 A JP2007019187 A JP 2007019187A JP 2005197938 A JP2005197938 A JP 2005197938A JP 2005197938 A JP2005197938 A JP 2005197938A JP 2007019187 A JP2007019187 A JP 2007019187A
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Abstract
【解決手段】 層間絶縁膜45上に形成したフォトレジスト膜51をマスクにして層間絶縁膜45をドライエッチングし、層間絶縁膜45の中途部に形成したストッパ膜46の表面でエッチングを停止することによって配線溝52、53を形成する。ここで、ストッパ膜46を光反射率の低いSiCN膜によって構成し、フォトレジスト膜51を露光する際の反射防止膜として機能させることにより、フォトレジスト膜51の下層に反射防止膜を形成する工程が不要となる。
【選択図】 図19
Description
(工程1)まず、従来周知の方法を用いて半導体基板上に半導体素子を形成し、半導体素子の上部に下層配線を形成する。
(工程2)次に、下層配線の上部に層間絶縁膜を堆積し、層間絶縁膜上に反射防止膜を形成した後、反射防止膜上にフォトレジスト膜を形成する。フォトレジスト膜は、ビアホールパターンが形成されたフォトマスクを使って露光を行い、続いて現像を行うことにより、ビアホール形成領域が開口されたパターンを転写する。反射防止膜は、フォトレジスト膜を露光する際、下層配線の表面で反射した露光光がフォトレジスト膜に入射して、解像度の低下を防ぐために形成する。フォトレジスト膜の下層に形成する反射防止膜は、BARC(Bottom Anti Reflective Coating)とも呼ばれる。
(工程3)次に、フォトレジスト膜をマスクにして反射防止膜および層間絶縁膜をドライエッチングすることにより、層間絶縁膜にビアホールを形成する。続いて、フォトレジスト膜と反射防止膜とを除去し、ビアホールの内部に埋め込み剤を充填する。埋め込み剤は、反射防止膜とほぼ同一組成の絶縁材料からなる。ビアホールの内部に埋め込み剤を充填するには、ビアホールの内部を含む層間絶縁膜上に埋め込み剤を堆積した後、ビアホールの外部の埋め込み剤をエッチバックにより除去する。このエッチバックを行うと、ビアホールに充填された埋め込み剤の表面は、ほぼ平坦になり、かつ層間絶縁膜の表面とほぼ同じ高さになる。
(工程4)次に、層間絶縁膜上に第2の反射防止膜を形成し、この反射防止膜上に第2のフォトレジスト膜を形成する。第2のフォトレジスト膜は、配線溝パターンが形成されたフォトマスクを使って露光を行い、続いて現像を行うことにより、配線溝形成領域が開口されたパターンを転写する。次に、第2のフォトレジスト膜をマスクにして第2の反射防止膜をドライエッチングし、続いて層間絶縁膜をその途中までドライエッチングすることにより、ビアホールの上部に配線溝を形成する。
(工程5)次に、第2のフォトレジスト膜を除去した後、第2の反射防止膜を除去する。第2の反射防止膜を除去する際は、ビアホールに充填された埋め込み剤も除去し、ビアホールの底部に下層配線の表面を露出させる。その後、配線溝およびビアホールの内部にCu配線を形成する。Cu配線を形成するには、配線溝およびビアホールの内部を含む層間絶縁膜上にスパッタリング法またはメッキ法でCu膜を堆積した後、配線溝の外部のCu膜を化学的機械研磨法によって除去する。以下、上記した工程2〜工程5を繰り返すことによって、半導体基板上に多層Cu配線を形成する。
本実施の形態は、例えば、4層Cu配線とヒューズとを有する半導体集積回路装置であり、その製造方法を図1〜図26を用いて工程順に説明する。
前記実施の形態1では、層間絶縁膜にビアホールを形成した後、配線溝を形成する場合について説明したが、本実施の形態では、層間絶縁膜に配線溝を形成した後、ビアホールを形成する場合について説明する。
2 素子分離溝
3 酸化シリコン膜
4 p型ウエル
5 n型ウエル
6 ゲート絶縁膜
7 ゲート電極
8 サイドウォールスペーサ
9 Coシリサイド膜
11 n型半導体領域(ソース、ドレイン)
12 p型半導体領域(ソース、ドレイン)
13 エッチングストッパ膜
14 絶縁膜
15 コンタクトホール
16 プラグ
17 絶縁膜(SiOC膜)
18 絶縁膜
19 第1層配線
20 配線溝
21、22 バリア絶縁膜
23 層間絶縁膜
24 絶縁膜
25 反射防止膜
26 フォトレジスト膜
27 ビアホール
28 埋め込み剤
30 反射防止膜
31 フォトレジスト膜
32 配線溝
33 第2層配線
34 バリア絶縁膜
35 層間絶縁膜
36 反射防止膜
37 フォトレジスト膜
38 ビアホール
39 埋め込み剤
40 反射防止膜
41 フォトレジスト膜
42 配線溝
43 第3層配線
44 バリア絶縁膜
45 層間絶縁膜
46 ストッパ膜
47 反射防止膜
48 フォトレジスト膜
49 ビアホール
50 埋め込み剤
51 フォトレジスト膜
52、53 配線溝
54 第4層配線
55 ヒューズ
56 バリア絶縁膜
57 層間絶縁膜
58 スルーホール
59 プラグ
60 最上層配線(第5層配線)
60B ボンディングパッド
61 表面保護膜
62 開口
63 ポリイミド樹脂膜
64 引き出し配線
65 ポリイミド樹脂膜
66 Au膜
67 半田バンプ
Qn:nチャネル型MISFET
Qp:pチャネル型MISFET
Claims (18)
- (a)半導体基板の主面に半導体素子を形成し、前記半導体素子の上部に1層または複数層の第1配線を形成する工程と、
(b)前記第1配線の上部に第1層間絶縁膜を形成し、前記第1層間絶縁膜の中途部に第1ストッパ膜を形成する工程と、
(c)前記第1層間絶縁膜の上部に第1反射防止膜を形成し、前記第1反射防止膜の上部に第1フォトレジスト膜を形成する工程と、
(d)前記第1フォトレジスト膜をマスクにして、前記第1反射防止膜、前記第1層間絶縁膜および前記第1ストッパ膜をエッチングすることにより、前記第1層間絶縁膜に第1ビアホールを形成する工程と、
(e)前記第1フォトレジスト膜および前記第1反射防止膜を除去した後、前記第1ビアホールの内部に第1埋め込み剤を充填する工程と、
(f)前記工程(e)の後、前記第1層間絶縁膜の上部に、反射防止膜を介することなく、第2フォトレジスト膜を形成する工程と、
(g)前記第2フォトレジスト膜をマスクにして、前記第1ビアホールが形成された領域を含む領域の前記第1層間絶縁膜をエッチングすることにより、前記第1ストッパ膜の上部の前記第1層間絶縁膜に第1配線溝を形成する工程と、
(h)前記第2フォトレジスト膜および前記第1埋め込み剤を除去した後、前記第1配線溝および前記第1ビアホールの内部に金属膜を埋め込んで第2配線を形成する工程とを含み、
前記第1ストッパ膜を光反射率の低い材料で構成することにより、前記第1層間絶縁膜の上部に形成した前記第2フォトレジスト膜を露光して前記第1配線溝のパターンを転写する際、前記第1ストッパ膜を反射防止膜として機能させることを特徴とする半導体集積回路装置の製造方法。 - 前記第1配線を形成する工程は、
(i)前記第1配線よりも下層の配線の上部に第2層間絶縁膜を形成する工程と、
(j)前記第2層間絶縁膜の上部に第2反射防止膜を形成し、前記第2反射防止膜の上部に第3フォトレジスト膜を形成する工程と、
(k)前記第3フォトレジスト膜をマスクにして、前記第2反射防止膜および前記第2層間絶縁膜をエッチングすることにより、前記第2層間絶縁膜に第2ビアホールを形成する工程と、
(l)前記第3フォトレジスト膜および前記第2反射防止膜を除去した後、前記第2ビアホールの内部に第2埋め込み剤を充填する工程と、
(m)前記工程(l)の後、前記第2層間絶縁膜の上部に第3反射防止膜を形成し、前記第3反射防止膜の上部に第4フォトレジスト膜を形成する工程と、
(n)前記第4フォトレジスト膜をマスクにして、前記第2ビアホールが形成された領域を含む領域の前記第2層間絶縁膜をその中途部までエッチングすることにより、前記第2層間絶縁膜に第2配線溝を形成する工程と、
(o)前記第4フォトレジスト膜および前記第2埋め込み剤を除去した後、前記第2配線溝および前記第2ビアホールの内部に金属膜を埋め込んで前記第1配線を形成する工程とを含むことを特徴とする請求項1記載の半導体集積回路装置の製造方法。 - 前記第1ストッパ膜は、SiCN膜であることを特徴とする請求項1記載の半導体集積回路装置の製造方法。
- 前記第1配線と前記第1層間絶縁膜との間に、前記第1配線を構成する金属の拡散を防ぐバリア絶縁膜を形成することを特徴とする請求項1記載の半導体集積回路装置の製造方法。
- 前記バリア絶縁膜は、SiCN膜であることを特徴とする請求項4記載の半導体集積回路装置の製造方法。
- 前記第1層間絶縁膜は、酸化シリコンを主体とする絶縁膜であり、前記バリア絶縁膜は、SiCN膜、またはSiCN膜上にSiCO膜を積層した2層膜であることを特徴とする請求項4記載の半導体集積回路装置の製造方法。
- 前記第1ビアホールの径は、前記第2ビアホールの径よりも大きいことを特徴とする請求項2記載の半導体集積回路装置の製造方法。
- 前記第1層間絶縁膜の膜厚は、前記第2層間絶縁膜の膜厚よりも大きいことを特徴とする請求項2記載の半導体集積回路装置の製造方法。
- 前記金属膜は、銅を主体とする金属膜であることを特徴とする請求項2記載の半導体集積回路装置の製造方法。
- (a)半導体基板の主面上に第1配線を形成する工程、
(b)前記第1配線上に第1層間絶縁膜を形成する工程、
(c)前記第1層間絶縁膜中に前記第1配線に接続するための第1ビアホールを形成する工程、
(d)前記第1ビアホールが形成された領域を含む領域の前記第1層間絶縁膜中に第1配線溝を形成する工程、
(e)前記第1配線溝および前記第1ビアホールの内部に金属膜を埋め込んで第2配線を形成する工程
(f)前記第2配線上に第1絶縁膜を有する第2層間絶縁膜を形成する工程、
(g)前記第2層間絶縁膜中に前記第2配線に接続するための第2ビアホールを形成する工程、
(h)前記第2ビアホールが形成された領域を含む領域の前記第2層間絶縁膜中に第2配線溝を形成する工程、
(i)前記第2配線溝および前記第2ビアホールの内部に金属膜を埋め込んで第3配線を形成する工程、
を有し、
前記第2層間絶縁膜の膜厚は前記第1層間絶縁膜の膜厚よりも厚く、
前記(h)工程において、前記第2配線溝は前記第1絶縁膜をエッチングストッパ膜として用いることによって形成し、
前記(d)工程において、前記第1配線溝はエッチングストッパ膜を用いることなく形成することを特徴とする半導体集積回路装置の製造方法。 - 前記(d)工程において、前記第1配線溝は、前記第1層間絶縁膜のエッチング時間を制御することによって行われることを特徴とする請求項10記載の半導体集積回路装置の製造方法。
- 前記第1配線溝の深さは前記第1ビアホールの深さよりも浅く、前記第2配線溝の深さは前記第2ビアホールの深さよりも浅いことを特徴とする請求項10記載の半導体集積回路装置の製造方法。
- 前記第2ビアホールの深さは前記第1ビアホールの深さよりも深く、前記第2配線溝の深さは前記第1配線溝の深さよりも深いことを特徴とする請求項10記載の半導体集積回路装置の製造方法。
- (a)半導体基板の主面上に形成された第1配線、
(b)前記第1配線上に形成された第1層間絶縁膜、
(c)前記第1層間絶縁膜中に形成された第1ビアホールであって、前記第1配線に接続する第1ビアホール、
(d)前記第1ビアホールが形成された領域を含む領域の前記第1層間絶縁膜中に形成された第1配線溝、
(e)前記第1配線溝および前記第1ビアホールの内部に金属膜が埋め込まれて形成された第2配線
(f)前記第2配線上に形成された第2層間絶縁膜、
(g)前記第2層間絶縁膜中に形成された第2ビアホールであって、前記第2配線に接続する第2ビアホール、
(h)前記第2ビアホールが形成された領域を含む領域の前記第2層間絶縁膜中に形成された第2配線溝、
(i)前記第2配線溝および前記第2ビアホールの内部に金属膜が埋め込まれて形成された第3配線、
を有し、
前記第2層間絶縁膜の膜厚は前記第1層間絶縁膜の膜厚よりも厚く、前記第2層間絶縁膜には、第1エッチングストッパ膜が形成されていることを特徴とする半導体集積回路装置。 - 前記第1層間絶縁膜には、エッチングストッパ膜が形成されていないことを特徴とする請求項14記載の半導体集積回路装置。
- 前記第1配線溝の深さは前記第1ビアホールの深さよりも浅く、前記第2配線溝の深さは前記第2ビアホールの深さよりも浅いことを特徴とする請求項14記載の半導体集積回路装置。
- 前記第2ビアホールの深さは前記第1ビアホールの深さよりも深く、前記第2配線溝の深さは前記第1配線溝の深さよりも深いことを特徴とする請求項14記載の半導体集積回路装置。
- 前記金属膜は銅を主体とする膜であることを特徴とする請求項14記載の半導体集積回路装置。
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