JP5060129B2 - ビア・ファースト・デュアルダマシン相互接続配線形成のための構造体充填方法 - Google Patents
ビア・ファースト・デュアルダマシン相互接続配線形成のための構造体充填方法 Download PDFInfo
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Description
本発明は部分硬化工程、溶剤エッチング工程、および最終硬化工程を用いた新規デュアルダマシンプロセスに関するものである。これらの方法により起伏に富んだ表面上でも偏向の小さい、極めて薄い硬化処理層が得られる。
PGMEAを溶剤として用いた完全充填の場合
異なるピッチと直径のエッチング済ビア配列を有するウェハ上をDUV52N(ミズーリー州、ローラ、Brewer Science Inc.社製)で被覆した。被覆したウェハを140℃で130秒間焼成し、DUV52N層を部分硬化させた。続いてウェハを21℃で30秒間冷却した。PGMEAを35秒間ウェハ上に付加した後、ウェハを2,000rpmで30秒間回転させ溶剤を除去した。最後に205℃で60秒間焼成し、DUV52Nの層を完全に硬化した。図4の走査型電子顕微鏡写真から、溶剤エッチ工程前のDUV52N層の厚さは250nm径、1:1ビア配列では120nm、また250nmの低密度ピッチビア配列では180nmであり、偏向は60nmとなった。溶剤エッチ工程後、厚さは高密度配列において68nmまで、低密度配列においては125nmまで薄くなり、偏向は57nmとなった。
PGMEを溶剤として用いた部分充填の場合
DUV52Nでビア配列を被覆し、160℃で60秒間焼成し、底部反射防止膜に部分硬化処理を施した。次にウェハを21℃で30秒間冷却した。引き続きPGMEを15秒間ウェハ上に付加した後、ウェハを2,000rpmで30秒間回転させ溶剤を除去し、205℃で60秒間、焼成による最終硬化処理を行った。溶剤エッチ工程前のDUV52Nの厚さは高密度ビア配列では174nm、低密度ビア配列では190nmとなり、偏向は16nmとなった。溶剤のエッチバックと最終硬化処理工程の後、底部反射防止膜はビアの底部にだけ残った。ビアに残った底部反射防止膜の厚さは高密度ビア配列では52nmで、低密度ビア配列では120nmとなり、偏向は78nmとなった。
PGMEを溶剤として用いた部分充填の場合
DUV52Nでビア配列を被覆し、160℃で60秒間焼成した。次にウェハを21℃で30秒間冷却した。引き続きPGMEを45秒間ウェハ上に付加した。ウェハを2,000rpmで30秒間回転させ溶剤を除去し、205℃で60秒間、焼成による最終硬化処理を行った。溶剤エッチ工程前のDUV52Nの厚さは高密度ビア配列では174nm、低密度ビア配列では190nmとなり、偏向は16nmとなった。溶剤のエッチバックと最終硬化処理工程の後、底部反射防止膜はビアの底部にだけ残った。ビアに残った底部反射防止膜の厚さは高密度ビア配列では30nmで、低密度ビア配列では90nmとなり、偏向は60nmとなった。
比較のためのビア充填材
DUV52(ミズーリー州、ローラ、Brewer Science Inc.社製)をビア配列に塗布し、溶剤エッチバック工程の後、DUV52Nと同じ厚さ(140nm)の層を得た。完全充填工程ではDUV52の厚さは低密度ビア配列で128nm、高密度配列では12nmとなった。偏向は116nmであり、実施例1の完全充填溶剤エッチバック工程の偏向である57nmより遥かに大きい値となった。完全ビア充填工程においては溶剤エッチバック工程によりビア配列の厚さ偏向は少なくとも50%減少した。部分充填工程では、DUV52の低密度・高密度配列間偏向は酸化物面上では81nm、ビア内では274nmであった。従来の底部反射防止膜ビア充填法に比べ、本願実施例2の方法では低密度・高密度ビア偏向が72%低減している。
ここでは溶剤エッチバック処理において異なる溶剤(PGME,GMEA,乳酸エチル)を用いて比較した。溶剤が異なるとエッチング率が著しく変わるかどうかを確認するため、各溶剤に対し部分硬化処理のための焼成マトリックスを行った。最終焼成は205℃で行った。この工程においては2度の焼成の時間はそれぞれ60秒に固定し、溶剤付加時間は30秒に固定して行った。ウェハは溶剤接触の前に21℃で30秒間冷却し、溶剤接触の後、30秒間かけて2,000rpmで溶剤を除去した。図6の高密度ビア充填率を示す実線から、ビア内のエッチ率は極めて類似しており、ほぼ同一であることがわかる。点線は低密度・高密度間充填偏向をナノメータ単位で表している。溶剤間の偏向は類似しており、典型的に約30〜40nmであった。またこれらの結果は部分ビア充填での最も好ましい処理温度帯は約180〜190℃であることを示している。
乳酸エチルを用いた場合
この実施例では焼成時間を焼成温度(180〜190℃)により15〜120秒の間で変化させ、焼成温度はより細かい区切で切り替えた。組成物はDUV52Nを用いた。その他の条件として、冷却は21℃で30秒、溶剤の付加は30秒、溶剤の除去は2,000rpmで30秒、最終焼成は205℃で60秒間それぞれ行った。
Claims (26)
- ビア・ファースト・デュアルダマシンプロセスを用いてダマシン構造体を製造する方法であって、
誘電層中にビア孔を有し、高密度領域と低密度領域を形成する複数の表面形状を含む表面を有する基板を作る工程と、
前記ビア孔の少なくとも一部分に組成物を塗布する工程と、
前記組成物を部分的に硬化させる工程と、
部分硬化組成物の一部を除去するように部分硬化組成物に溶剤を接触させる工程と、
部分硬化組成物を第2の硬化工程で処理する工程を含み、
前記塗布工程が前記表面形状の少なくともいくつかに前記組成物を塗布することを含み、
前記第2の硬化工程の後、前記組成物が前記表面形状上でひとつの層の形態となり、高密度領域での層の平均厚みと低密度領域での層の平均厚みとの相違が80nm未満となる方法。 - 前記基板がシリコン、アルミニウム、タングステン、ケイ化タングステン、ガリウム砒素、ゲルマニウム、タンタル、亜硝酸タンタル、およびシリコンゲルマニウムから成るグループから選択されることを特徴とする請求項1に記載の方法。
- 前記組成物が硬化温度を有し、前記部分硬化工程が前記組成物を前記硬化温度の65〜95%の温度で加熱することを含むことを特徴とする請求項1に記載の方法。
- 前記部分硬化工程で前記組成物を90%未満だけ硬化することを特徴とする請求項1に記載の方法。
- 前記組成物を15〜90秒間加熱することを特徴とする請求項3に記載の方法。
- 前記組成物を140〜180℃の温度で加熱することを特徴とする請求項3に記載の方法。
- 前記組成物が前記部分硬化工程後に部分硬化層を含み、前記接触工程が前記層上に溶剤を付加することを含むことを特徴とする請求項1に記載の方法。
- 前記接触工程が溶剤を前記組成物に10〜60秒間接触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。
- 前記溶剤が乳酸エチル、プロピレン・グリコール・モノメチル・エーテル、プロピレン・グリコール・モノメチル・エーテル・アセテート、およびこれらの混合物から成るグループから選択されることを特徴とする請求項1に記載の方法。
- 前記組成物が前記接触工程前に平均厚さを有する層を含み、前記接触工程により前記層が溶剤接触の1秒当たり40〜80Åの率で除去されることを特徴とする請求項1に記載の方法。
- 更に前記部分硬化工程の後、前記組成物を冷却する工程を含むことを特徴とする請求項1に記載の方法。
- 前記冷却工程が前記組成物を周囲条件内に放置することを含むことを特徴とする請求項11に記載の方法。
- 前記放置は20〜40秒間行うことを特徴とする請求項12に記載の方法。
- 前記第2の硬化工程が部分硬化組成物を更に硬化させるために、充分な時間、充分な温度まで加熱することを含むことを特徴とする請求項1に記載の方法。
- 前記第2の硬化工程で部分硬化組成物を少なくとも98%硬化させることを特徴とする請求項14に記載の方法。
- 前記第2の硬化工程が部分硬化組成物を195〜250℃の温度まで加熱することを含むことを特徴とする請求項1に記載の方法。
- 前記第2の硬化工程が部分硬化組成物を30〜90秒間加熱することを特徴とする請求項1に記載の方法。
- 前記ビア孔のそれぞれが側壁および底部壁を含み、また前記塗布工程が組成物を前記ビア孔側壁と底部壁の少なくとも一部に塗布することを含むことを特徴とする請求項1に記載の方法。
- 前記塗布工程の後、前記ビア孔が前記組成物により少なくとも95%充填されることを特徴とする請求項18に記載の方法。
- 前記層が、100nm未満の平均厚さを有することを特徴とする請求項1に記載の方法。
- 請求項1に記載された方法によって得られるダマシン構造体であって、
誘電層中にビア孔を有し、高密度領域と低密度領域とを形成する複数の表面形状を含む表面を有する基板と、前記基板表面に隣接し、100nm未満の平均厚さで、高密度領域での層の平均厚みと低密度領域での層の平均厚みとの相違が80nm未満となる組成物層とを含むことを特徴とするダマシン構造体。 - 前記平均厚さが80nm未満であることを特徴とする請求項21に記載のダマシン構造体。
- 前記相違が65nm未満であることを特徴とする請求項21に記載のダマシン構造体。
- 前記基板がシリコン、アルミニウム、タングステン、ケイ化タングステン、ガリウム砒素、ゲルマニウム、タンタル、亜硝酸タンタル、およびシリコンゲルマニウムから成るグループから選択されることを特徴とする請求項21に記載のダマシン構造体。
- 前記ビア孔が少なくとも95%だけ前記組成物により充填されていることを特徴とする請求項21に記載のダマシン構造体。
- 前記層が、硬化組成物よりなる請求項21に記載のダマシン構造体。
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US50436803P | 2003-09-19 | 2003-09-19 | |
US60/504,368 | 2003-09-19 | ||
US10/943,033 US7348281B2 (en) | 2003-09-19 | 2004-09-16 | Method of filling structures for forming via-first dual damascene interconnects |
US10/943,033 | 2004-09-16 | ||
PCT/US2004/030816 WO2005029556A2 (en) | 2003-09-19 | 2004-09-17 | Method of filling structures for forming via-first dual damascene interconnects |
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US20050118800A1 (en) | 2005-06-02 |
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US7602066B2 (en) | 2009-10-13 |
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US20070123036A1 (en) | 2007-05-31 |
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