JP6484631B2 - 有機金属溶液に基づいた高解像度パターニング組成物 - Google Patents
有機金属溶液に基づいた高解像度パターニング組成物 Download PDFInfo
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- JP6484631B2 JP6484631B2 JP2016536100A JP2016536100A JP6484631B2 JP 6484631 B2 JP6484631 B2 JP 6484631B2 JP 2016536100 A JP2016536100 A JP 2016536100A JP 2016536100 A JP2016536100 A JP 2016536100A JP 6484631 B2 JP6484631 B2 JP 6484631B2
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Description
本明細書に記載される本発明の開発は、米国国立科学財団(U.S.National Science Foundation)助成金IIP−0912921による政府支援によって少なくとも部分的に資金提供され、米国政府は本発明において特定の権利を有する。
レジストコーティングを形成するための前駆体溶液は、一般的に、有機溶媒(一般的には、有機溶媒)中に適切な有機安定化配位子を有する金属カチオンを含む。前駆体溶液および最終的なレジストコーティングは金属酸化物化学に基づいており、有機配位子を有する金属ポリカチオンの有機溶液は、良好なレジスト特性を有する安定した溶液を提供する。配位子は放射線感受性を提供し、配位子の特定の選択は放射線感受性に影響し得る。特に、前駆体溶液は、金属カチオンおよび関連の配位子の選択に基づいて選択された放射線に対して所望のレベルの放射線吸収を達成するように設計され得る。溶液中の配位子安定化金属カチオンの濃度は、特定の付着手段(例えば、スピンコーティングなど)のために適切な溶液特性を提供するように選択され得る。安定性および加工の有効性に関して特に有効性を有する金属は、第13族、第14族および第15族の金属である。対応して、パターニングのために一般的に使用される放射線の高い吸収を提供するために、前駆体溶液中にSn、InおよびSb金属を含むことが望ましいが、これらの金属は、特性、特に放射線吸収を調整するために他の金属と組み合わせることも可能である。前駆体溶液は非常に高レベルの安定性を達成するように配合されており、従って、前駆体溶液は商品のために適切な貯蔵寿命を有する。以下のセクションに記載されるように、前駆体溶液は基板表面に塗布され、乾燥され、さらに処理されて、効果的な放射線レジストを形成することができる。前駆体溶液は、少なくとも部分的に溶媒が除去されたときにコーティング組成物を形成するように設計され、最終的には、無機固体は、照射および/または熱処理、プラズマへの暴露、または同様の処理の際に金属酸化物が大半を占める。
nRCl+Sn→RnSnCl4−n+残渣
4RMgBr+SnCl4→R4Sn+4MgBrCl
3SnCl4+4R3Al→3R4Sn+4AlCl3
R4Sn+SnCl4→2R2SnCl2
式中、Rは有機配位子を表す。一般的に、異なる適切なハロゲン化物は、上記反応において置換され得る。反応は、反応物が合理的な溶解度を有する適切な有機溶媒中で実行され得る。
コーティング材料は、選択された基板への前駆体溶液の付着、およびそれに続く加工によって形成される。基板は一般的にコーティング材料が付着され得る表面を示し、そして基板は、表面が最上層に関連している複数の層を含み得る。いくつかの実施形態では、基板表面は、コーティング材料の接着のための表面を作製するために処理することができる。また、必要に応じて表面は清浄化および/または平滑化され得る。適切な基板表面は、任意の合理的な材料を含むことができる。特に興味深いいくつかの基板は、基板の表面にわたっておよび/または層内に、例えば、シリコンウェハ、シリカ基板、他の無機材料、ポリマー基板、例えば有機ポリマーなど、これらの複合体、およびこれらの組み合わせを含む。比較的薄い円筒形構造などのウェハが便利であり得るが、任意の合理的な形状の構造を使用することができる。ポリマー基板または非ポリマー構造上にポリマー層を有する基板は、その低コストおよび柔軟性に基づいて、特定の用途のために望ましいことがあり、適切なポリマーは、本明細書に記載されるパターニング可能な材料の加工のために使用され得る比較的低い加工温度に基づいて選択され得る。適切なポリマーは、例えば、ポリカーボネート、ポリイミド、ポリエステル、ポリアルケン、そのコポリマーおよびその混合物を含むことができる。一般に、基板は、特に高解像度用途のために、平坦な表面を有することが望ましい。
コーティング材料は、放射線を用いて微細にパターン化され得る。上記のように、前駆体溶液の組成、従って対応するコーティング材料の組成は、所望の形態の放射線を十分に吸収するように設計され得る。放射線の吸収は、金属と有機配位子間の結合を破壊できるエネルギーを生じ、その結果、有機ベースの配位子の少なくとも一部はもはや材料を安定化するために利用できない。十分な量の放射線の吸収により、暴露されたコーティング材料は凝縮し、すなわち増強された金属オキソ/ヒドロキソネットワークを形成し、これは、周囲大気から吸収された水を含み得る。放射線は、一般に、選択されたパターンに従って送達され得る。放射線パターンは、照射領域および非照射領域を有するコーティング材料において対応するパターンまたは潜像に転写される。照射領域は、化学的に変化されたコーティング材料を含み、非照射領域は一般的に形成されたままのコーティング材料を含む。下記のように、非照射コーティング材料の除去あるいは照射コーティング材料の選択的除去によるコーティング材料の現像の際、非常に鋭いエッジが形成され得る。
画像の現像は、潜像を含むパターン化コーティング材料を現像剤組成物に接触させて、非照射コーティング材料を除去してネガ画像を形成するか、または照射コーティングを除去してポジ画像を形成するかのいずれかを含む。本明細書に記載されるレジスト材料を用いると、一般的には同じコーティングに基づいて適切な現像溶液を用いて、望ましい解像度を有する効果的なネガティブパターニングまたはポジティブパターニングを実施することができる。特に、照射領域は少なくとも部分的に凝縮されて金属酸化物の特性が増大され、その結果、照射材料は有機溶媒による溶解に対して耐性であり、非照射組成物は有機溶媒に可溶性のままである。凝縮したコーティング材料への言及は、材料の酸化物特性が初期材料に対して増大するという意味において少なくとも部分的な凝縮を指す。一方、非照射材料は、材料が疎水性であるために弱い塩基または酸水溶液に溶解せず、従って、ポジティブパターニングのために塩基水溶液を使用して、非照射材料を保持しながら照射材料を除去することができる。
パターン化コーティング材料を形成した後、コーティング材料は、選択されたデバイスの形成を容易にするためにさらに加工され得る。さらに、構造を完成させるために、一般的にさらなる材料の付着、エッチングおよび/またはパターニングが実施され得る。コーティング材料は、最終的に除去されてもされなくてもよい。パターン化コーティング材料の品質は、いずれの場合も、改善されたデバイス(例えば、より小さい設置面積を有するデバイスなど)の形成のために前進され得る。
この実施例は、スズベースの有機金属組成物を付着して放射線レジストコーティングを形成するための前駆体溶液の調製について記載された。
この実施例は、電子ビーム暴露または極紫外線暴露に基づいて、ネガ型画像形成に基づくレジストパターンの形成を実証する。
この実施例は、実施例1からのレジスト溶液を用いて、ポジ型画像の形成を実証した。
この実施例は、レジスト前駆体溶液およびエージング後の被覆膜の一貫した画像形成性能によってレジスト前駆体の安定性を実証する。
この実施例は、適切な有機配位子を選択することによってレジストの放射線感受性の調節が観察されることを実証する。
この実施例は、スズイオンに対してアルキルおよびカルボキシラート配位子を用いて形成された放射線レジストの有効性を実証する。
Claims (20)
- 放射線により基板をパターン化するための方法であって、
選択されたパターンに沿って被覆基板を照射して、約5nm〜約200nmの平均厚さを有する照射コーティングの領域および非照射コーティングの領域を有する照射構造を形成するステップであって、前記被覆基板が、金属炭素結合および/または金属カルボキシラート結合により有機配位子(過酸化物配位子を除く)を有する金属イオンを有する金属オキソ−ヒドロキソネットワークを含むコーティングを含むステップと、
前記照射構造を約45℃〜約250℃の温度で約0.1分〜約30分加熱し、アニーリングされた照射構造を形成するステップと、
前記照射構造を選択的に現像して、前記照射コーティングまたは前記非照射コーティングの大部分を除去してパターン化基板を形成するステップと
を含み、
前記金属イオンが、スズイオン、アンチモンイオン、インジウムイオンまたはこれらの組み合わせを含む、方法。 - 前記照射構造が二者択一的にポジ型画像形成またはネガ型画像形成を受けることができるように、前記照射構造が、塩基水溶液に可溶性である照射コーティングと、有機溶媒に可溶性である非照射コーティングとを有する、請求項1に記載の方法。
- 前記非照射コーティングを除去するために、前記現像が有機溶媒を用いて実施される、請求項1または2に記載の方法。
- 前記選択的な現像が塩基水溶液を用いて実施される、請求項1または2に記載の方法。
- 前記照射が、電子ビーム、紫外線、極紫外線、ArFレーザーからの照射、KrFレーザーからの照射、またはUVランプを用いて実施される、請求項1〜4のいずれか一項に記載の方法。
- 前記パターン化された基板が、約60nm以下の平均ピッチを有するフィーチャを含む、請求項1〜5のいずれか一項に記載の方法。
- 前記非照射コーティングは、金属カチオンに対する有機配位子のモル比が約0.1〜約4であり、そして約1ミクロン以下の平均コーティング厚さを有する、請求項1〜6のいずれか一項に記載の方法。
- 前記金属イオンがスズイオン、アンチモンイオン、インジウムイオンまたはこれらの組み合わせを含み、前記有機配位子が金属炭素結合、金属−カルボキシル結合、または、該金属炭素結合と該金属−カルボキシル結合との双方を形成し、
金属炭素結合を形成する配位子がアルキル配位子、アルケニル配位子、アリール配位子、またはこれらの組み合わせを含んで成り、該配位子は1〜16個の炭素原子を含有し、
金属−カルボキシル結合を形成する配位子が、アルキルカルボキシラート配位子、アルケニルカルボキシラート配位子、アリールカルボキシラート配位子またはこれらの組み合わせによって形成され、該配位子が1〜16個の炭素原子を有する、請求項1〜7のいずれか一項に記載の方法。 - 液体前駆体溶液を付着させ、溶媒を蒸発させてコーティングを凝固させることによって前記コーティングを形成するステップをさらに含む、請求項1〜8のいずれか一項に記載の方法。
- 約5nm〜約200nmの平均厚さと、コーティングに沿った任意の点において前記平均から約50%以下である厚さ変動とを有する放射線感受性コーティングを含む被覆基板であって、前記コーティングが、金属炭素結合および/または金属カルボキシラート結合により有機配位子(過酸化物配位子を除く)を有する金属イオンを有する金属オキソ−ヒドロキソネットワークを含み、
前記金属イオンが、スズイオン、アンチモンイオン、インジウムイオンまたはこれらの組み合わせを含む、被覆基板。 - 前記金属イオンに対する前記有機配位子のモル比が約0.1〜約4である、請求項10に記載の被覆基板。
- 前記金属イオンに対する前記有機配位子のモル比が約0.5〜約3である、請求項10に記載の被覆基板。
- 約1ミクロン以下の平均コーティング厚さを有する、請求項10〜12のいずれか一項に記載の被覆基板。
- 前記金属イオンがさらに、金属および半金属の全含有量の約50モル%以下である別の金属元素および/または半金属元素のイオンを含む、請求項10〜13のいずれか一項に記載の被覆基板。
- 前記有機配位子が金属炭素結合を形成し、前記金属炭素結合を形成する配位子が、アルキル配位子、アルケニル配位子、アリール配位子またはこれらの組み合わせを含み、それぞれの配位子が1〜16個の炭素原子を含有する、請求項10〜14のいずれか一項に記載の被覆基板。
- 前記有機配位子が金属カルボキシル結合を形成し、前記金属カルボキシル結合が、アルキルカルボキシラート配位子、アルケニルカルボキシラート配位子、アリールカルボキシラート配位子またはこれらの組み合わせによって形成され、それぞれの配位子が1〜16個の炭素原子を有する、請求項10〜14のいずれか一項に記載の被覆基板。
- 表面を有する基板と、前記表面に沿って選択された領域に存在し、前記表面に沿って他の領域には存在しない第1のコーティングとを含むパターン化基板であって、前記第1のコーティングが金属オキソ−ヒドロキソネットワークおよび有機配位子を含み、金属イオンが金属炭素結合によって有機配位子を有しており、二者択一的に、前記第1のコーティングが有機液体に可溶性であるか、または前記第1のコーティングが塩基水溶液に可溶性であり、
前記金属イオンが、スズイオン、アンチモンイオン、インジウムイオンまたはこれらの組み合わせを含む、パターン化基板。 - 前記コーティングが存在しない前記基板の領域において前記基板表面が露出される、請求項17に記載のパターン化基板。
- 前記コーティングが有機液体に効果的に可溶性であり、第1のコーティングが存在しない領域において前記表面に沿って第2のコーティングをさらに含み、前記第2のコーティングが塩基水溶液に可溶性である、請求項17または18に記載のパターン化基板。
- 前記パターン化された基板が、約60nm以下の平均ピッチを有するフィーチャを含む、請求項17〜19のいずれか一項に記載のパターン化基板。
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