JP6810696B2 - ハードマスク組成物および半導体基板上での微細パターンの形成方法 - Google Patents
ハードマスク組成物および半導体基板上での微細パターンの形成方法 Download PDFInfo
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- JP6810696B2 JP6810696B2 JP2017542066A JP2017542066A JP6810696B2 JP 6810696 B2 JP6810696 B2 JP 6810696B2 JP 2017542066 A JP2017542066 A JP 2017542066A JP 2017542066 A JP2017542066 A JP 2017542066A JP 6810696 B2 JP6810696 B2 JP 6810696B2
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Classifications
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Description
a)以下の構造(I)の可溶性マルチ−リガンド−置換された金属化合物:
ここで、
1)は有機部分(II)であり、
ここで、R11は、水素、C1〜C8アルキル部分、ヒドロキシル基で置換されたC1〜C8アルキル部分、またはアリール部分であり、
R12およびR13は、C1〜C8アルキル部分、C3−C12分岐アルキル部分、またはアリール部分から独立して選択され、式中、pはシロキサン部分(V)中の繰り返し単位の数を表し、そして
c)溶媒。
本明細書中で使用される場合、連結部「および」は包括的であることを意図しており、連結部「または」は他に指示がない限り排他的であることを意図していない。例えば、「またはその代わりに」という語句は排他的であることが意図されている。
a)以下の構造(I)の可溶性マルチ−リガンド−置換された金属化合物:
ここで、
1)は有機部分(II)であり、
ここで、R11は、水素、C1〜C8アルキル部分、ヒドロキシル基で置換されたC1〜C8アルキル部分、またはアリール部分であり、
R12およびR13は、C1〜C8アルキル部分、C3−C12分岐アルキル部分、またはアリール部分から独立して選択され、式中、pはシロキサン部分(V)中の繰り返し単位の数を表し、そして
c)溶媒。
ここで、
1)は有機部分(II)であり、
ここで、R11は、水素、C1〜C8アルキル部分、ヒドロキシル基で置換されたC1〜C8アルキル部分、またはアリール部分であり、
R12およびR13は、C1〜C8アルキル部分、C3−C12分岐アルキル部分、またはアリール部分から独立して選択され、式中、pはシロキサン部分(V)中の繰り返し単位の数を表し、そして
ここで、rは少なくとも2であり、qは0−2の範囲であり、XがCである場合、qとrの合計は4であり、XがNである場合、qとrの合計が3であり、
さらに、R14は水素、C1〜C8アルキル部分またはC2〜C8ヒドロキシアルキレン部分であり;XがNである場合、YはC2〜C8アルキレン部分であり;XがCである場合、Yは、直接原子価結合、C2〜C8アルキレン部分、構造(VII)を有するアルコキシアルキレン鎖を含む部分から独立して選択され、ここで、R15がC2〜C8アルキレン部分であり、tはアルコキシアルキレン鎖中に存在するアルコキシアルキレン単位の数を表し、tが0〜2であり、t’は1〜2である。
40gのTi(IV)BTP(ブトキシドポリマー)ポリマーを52gのArF希釈溶媒(70%PGMEA、30%PGME)に溶解し、N2下で反応容器に注いだ。撹拌しながら温度を50℃に上げ、一方、トリメチルシラノール12gを上記TiBTPに滴下した。反応を60℃で2時間維持した。次いで、20gの1,2−シクロヘキサンジカルボン酸無水物とA20gのrF希釈溶媒を上記反応混合物と混合し、60℃で約1時間反応させた。室温まで一晩冷却した後、生成物を茶色の瓶に貯蔵し、注意深く密閉した。シクロヘキサン中で生成物溶液のFT−IRスペクトルを取った。970cm−1のFT−IR共鳴をTi−O−Si伸縮振動数に割り当てた。
40gのTi(IV)BTPポリマーを58gのArF希釈溶媒に溶解し、N2下で反応容器に注いだ。撹拌しながら温度を50℃に上げ、トリメチルシラノール18gを上記TiBTP溶液に滴下した。反応を60℃で2時間維持した。次いで、1,2−シクロヘキサンジカルボン酸無水物30gおよびArF希釈溶媒30gを上記反応混合物と混合し、60℃で約1時間反応を続けた。室温まで一晩冷却した後、生成物を茶色の瓶に貯蔵し、注意深く密封した。シクロヘキサン中で生成物溶液のFT−IRスペクトルを取った。970cm−1のFT−IR共鳴をTi−O−Si伸縮振動数に割り当てた。
40gのTi(IV)BTPポリマーを58gのArF希釈溶媒に溶解し、N2下で反応容器に注いだ。撹拌しながら50℃に昇温し、トリメチルシラノール18gを上記TiBTP溶液に滴下した。反応を60℃で2時間維持した。次いで、無水シトラコン酸22gおよびArF希釈溶媒22gを上記反応混合物と混合し、反応を60℃で約1時間続けた。室温まで一晩冷却した後、生成物を茶色の瓶に貯蔵し、注意深く密封した。シクロヘキサン中で生成物溶液のFT−IRスペクトルを取った。970cm−1のFT−IR共鳴をTi−O−Si伸縮振動数に割り当てた。
450gのシトラコン酸無水物、600gのTi(IV)ブトキシドポリマーおよび1050gのArF希釈を撹拌して混合し、フラスコ内で窒素下で加熱した。反応を50℃で約4時間維持した。室温まで一晩冷却した後、固形分50%の生成物を茶色の瓶に貯蔵した。プロトンNMRは生成物中に無水カルボニルを示さなかった。シクロヘキサン中のFT−IRスペクトルは、Ti−OBu共鳴に起因する〜1100cm−1でのピークの減少を示し、Ti−OC(=O)R共鳴による1570cm−1での新しいブロードなピークを示した。
40gのTi(IV)BTPポリマー、22.5gのシトラコン酸無水物および50gのPGMEA/PGME70:30を撹拌して混合し、フラスコ内で窒素下で加熱した。反応を50℃で約2時間維持した。PGMEA/PGME70:30の15g中のノナフルオロブタン−1−スルホン酸2.5gを反応容器にゆっくりと加えた。50℃でさらに2時間反応させた。室温まで冷却した後、固形分50%の生成物を茶色の瓶に貯蔵した。シクロヘキサン中で採取したFT−IRスペクトルは、Ti−OBu共鳴に起因する〜1100cm−1のピークの減少、およびTi−OC(=O)R共鳴に起因する1570cm−1の新しいブロードなピークを示した。
シトラコン酸無水物15g、Ti(IV)ブトキシドポリマー40gおよびArF希釈55gを撹拌混合し、フラスコ内で窒素下で加熱した。反応を50℃で約4時間維持した。室温まで一晩冷却した後、固形分50%の生成物を茶色の瓶に貯蔵した。プロトンNMRは生成物中に無水物を示さなかった。シクロヘキサン中で採取したFT−IRスペクトルは、Ti−OBu共鳴に起因する〜1100cm−1のピークの減少、およびTi−OC(=O)R共鳴に起因する1570cm−1の新しいブロードなピークを示した。
200gのHf(IV)テトラn−ブトキシドを276gのArF希釈溶媒に溶解し、N2下で反応容器に注いだ。攪拌しながら温度を50℃に上げ、トリメチルシラノール76gを上記溶液に滴下した。反応を60℃で2時間維持した。127gの1,2−シクロヘキサンジカルボン酸無水物と127gのArF希釈溶媒とを上記反応混合物と混合し、反応を60℃で約1時間続けた。室温まで一晩冷却した後、生成物を茶色の瓶に貯蔵し、注意深く密封した。
Zrテトラn−ブトキシド200gをArF希釈溶媒246.5gに溶解し、N2下で反応容器に注いだ。撹拌しながら温度を50℃に上げ、トリメチルシラノール77.5gを上記溶液に滴下した。反応を60℃で2時間維持した。次いで、1,2−シクロヘキサンジカルボン酸無水物103gおよびArF希釈溶媒103gを上記反応混合物と混合し、反応を60℃で約1時間続けた。室温まで一晩冷却した後、生成物を茶色の瓶に貯蔵し、注意深く密封した。
200gのZrテトラ−t−ブトキシドを262gのArF希釈溶媒に溶解し、N2下で反応容器に注いだ。攪拌しながら温度を50℃に上げ、トリメチルシラノール62gを上記溶液に滴下した。反応を60℃で2時間維持した。次いで、1,2−シクロヘキサンジカルボン酸無水物103gおよびArF希釈溶媒103gを上記反応混合物と混合し、60℃で約1時間反応を続けた。室温まで一晩冷却した後、生成物を茶色の瓶に貯蔵し、注意深く密封した。
40gのHf(IV)テトラn−ブトキシドを56gのAZ(登録商標)ArF希釈溶媒に溶解し、N2下で反応容器に注いだ。撹拌しながら温度を50℃に上げ、トリメチルシラノール15.4gをN2下で撹拌しながら上記溶液に滴下した。反応混合物を60℃で2時間維持した。その後、75.6gのAZ(登録商標)ArF希釈溶媒中の32.4gのp−トルエンスルホン酸一水和物を反応混合物に加え、反応を60℃で1時間続けた。室温まで一晩冷却した後、生成物を茶色の瓶に貯蔵し、注意深く密封した。
合成例1(または合成例2−6のいずれか)の金属ポリマー14.6質量%およびトリエタノールアミン5.4質量%を含有する20質量/質量%溶液をPGMEA/PGME70:30溶媒中で調製した。十分に混合した後、溶液をシリコンウェハ上にスピンコートし、250℃で60秒間ベークした。コーティングされたウェハは、XSEM画像によって良好なコーティング品質を示した。
合成例1の金属ポリマー12質量%とペンタエリスリトールエトキシレート(3/4EO/OH)8質量%を含有する20質量/質量%溶液をPGMEA/PGME70:30溶媒中で調製した。十分に混合した後、溶液をシリコンウェハ上にスピンコートし、250℃で60秒間ベークした。コーティングされたウェハは、XSEM画像によって良好なコーティング品質を示した。
合成例4の金属ポリマー10質量%とペンタエリスリトールエトキシレート(3/4EO/OH)10質量%を含む20質量/質量%溶液をPGMEA/PGME70:30溶媒中で調製した。十分に混合した後、溶液をシリコンウェハ上にスピンコートし、250℃で60秒間ベークした。コーティングされたウェハは、XSEM画像によって良好なコーティング品質を示した。
合成例7(または合成例7のいずれか)の金属ポリマー22.0質量%およびトリエタノールアミン3.0質量%を含有する25質量/質量%溶液をPGMEA/PGME70:30溶媒中で調製した。十分に混合した後、溶液をシリコンウェハ上にスピンコートし、250℃で60秒間ベークした。コーティングされたウェハは、XSEM画像によって良好なコーティング品質を示した。
合成例8(または合成例9)の金属ポリマー21.8質量%およびトリエタノールアミン3.2質量%を含有する25質量%溶液を、PGMEA/PGME70:30溶媒中で調製した。十分に混合した後、溶液をシリコンウェハ上にスピンコートし、250℃で60秒間ベークした。コーティングされたウェハは、XSEM画像によって良好なコーティング品質を示した。
合成例8の20質量%の金属ポリマーと5質量%のトリエタノールアミンを含む25質量%溶液をPGMEA/PGME70:30溶媒中で調製した。十分に混合した後、溶液をシリコンウェハ上にスピンコートし、250℃で60秒間ベークした。コーティングされたウェハは、XSEM画像によって良好なコーティング品質を示した。
合成例10の金属ポリマー14.6質量%およびトリエタノールアミン5.4質量%を含有する20質量%溶液を、PGMEA/PGME70:30溶媒中で調製した。十分に混合した後、溶液をシリコンウェハ上にスピンコートし、250℃で60秒間ベークした。コーティングされたウェハは、XSEM画像によって良好なコーティング品質を示した。
配合物例1,2または3を別々にコーティングし、適切な温度、通常はシリコンウェハ上で250℃/60秒〜300℃/60秒でベークした。フィルム中の金属質量%は、元素分析およびTGA質量損失測定によって測定した。2つの方法の結果は一致していた。測定された総金属酸化物含有量は、250℃/60s〜300℃/60s焼成条件でフィルム中20〜40質量%の範囲であった。このフィルムは、主に、すべての場合に元素分析に基づいてケイ素含量の少ないチタン化合物で構成されていた。
配合例4および6をシリコンウェハ上に塗布して250℃/60秒で焼成し、膜厚200nmの金属酸化物膜を得た。外部HP3890Aメーターを100kHzで使用した容量測定に基づいて、金属酸化物フィルムの誘電体定数Kを算出した。配合例4はK=4.5のフィルムをもたらし、配合例6は有機化合物のK値(<4)より高いK=5.1のフィルムを生じた。
配合例1〜7を、650nmの深さを有する70,80,90および100nmサイズのビアホールを有するシリコンウェハ上に個別にコーティングし、250℃/60秒で焼成した。ここで、ビアホールは半密集で隔離され、それぞれ1:1,1:1.4,1:6のホール対スペース比を有する独立したパターンである。被覆されたウェハを走査型電子顕微鏡で検査したところ、いずれの場合においても良好な充填性能がボイドなしで観察された。
合成例1〜10の金属ポリマーを含有する個々の20質量%溶液を、PGMEA/PGME70:30溶媒中で調製した。金属ポリマーの完全な溶解のために混合した後、溶液を個別にスピンコートし、650nmの深さを有する70,80,90および100nmのサイズのビアホールを有するシリコンウェハ上で250℃/60秒でベーキングした。ビアホールは、1:1,1:1.4,1:6のそれぞれのホール対スペース比で半密集し孤立したパターンで配置されていた。個々にコーティングされたウェハを走査型電子顕微鏡で検査した。すべての場合において、有意な空隙が観察された。これらの比較例は、「ビア充填性能評価例1」に示されているように、類似の条件下で良好なビア充填性能を付与した、新規な組成物中のポリオールの存在により予期されない結果を示した。
Claims (18)
- a)構造(I)の可溶性マルチ−リガンド−置換された金属化合物:
nは1〜20であり、そして、R1、R2、R3およびR4は、
部分2)が、構造(I)中の部分R 1 、R 2 、R 3 およびR 4 の全モルの30モル%〜60モル%の範囲となり、さらに、構造(II)の有機部分1)が構造(I)中の部分R 1 、R 2 、R 3 およびR 4 の全モルの30モル%〜60モル%の範囲となるように、
1)、2)、3)またはそれらの混合物から独立して選択される部分であり、
ここで、
1)は有機部分(II)であり、
ここで、R11は、水素、C1〜C8アルキル部分、ヒドロキシル基で置換されたC1〜C8アルキル部分、またはアリール部分であり、
R12およびR13は、C1〜C8アルキル部分、C3−C12分岐アルキル部分、またはアリール部分から独立して選択され、式中、pはシロキサン部分(V)中の繰り返し単位の数を表し、そして
b)構造(VI)を有するポリオール化合物
さらに、R14は水素、C1〜C8アルキル部分またはC2〜C8ヒドロキシアルキレン部分であり;XがNである場合、YはC2〜C8アルキレン部分であり;XがCである場合、Yは、直接原子価結合、C2〜C8アルキレン部分、または構造(VII)を有するアルコキシアルキレン鎖を含む部分から独立して選択され、ここで、R15はC2〜C8アルキレン部分であり、tが0〜2であり、t’は1〜2である;
c)溶媒
を含む組成物。 - 前記金属が、チタン(4)、ジルコニウム(4)、ハフニウム(4)からなる群から選択される、請求項1に記載の組成物。
- R7が構造(V)を有する、請求項1〜3のいずれか一つに記載の組成物。
- 構造(VI)を有する前記ポリオールが構造(VII)を有するYを有し、さらにこのポリオールが500未満の質量平均分子量および250℃より高い沸点を有する、請求項1〜5のいずれか一つに記載の組成物。
- 構造(VI)を有する前記ポリオールが、テトラエチレングリコール、トリエチレングリコール、グリセロール、トリエタノールアミン、ジエタノールアミン、ネオペンチルグリコール、グリセロールプロポキシレートおよびペンタエリスリトールエトキシレートからなる群から選択される、請求項1〜6のいずれか一つに記載の組成物。
- 前記ポリオールが、前記組成物中の全固形分の60質量%未満かつ5質量%超の含有量を有する、請求項1〜8のいずれか一つに記載の組成物。
- 前記溶媒が、アルコール、エステル、ケトン、ラクトン、ジケトン、芳香族部分、カルボン酸、アミド、または、これらの混合物から選択される、請求項1〜9のいずれか一つに記載の組成物。
- 熱酸発生剤、熱塩基発生剤、および熱活性化過酸化物からなる群から選択される少なくとも一つの付加的な成分をさらに含む、請求項1〜10のいずれか一つに記載の組成物。
- 界面活性剤、表面平滑化剤、架橋添加剤、および熱活性化触媒からなる群から選択される少なくとも一つの付加的な成分をさらに含む、請求項1〜11のいずれか一つに記載の組成物。
- 構造(I)中のnが2〜20である、請求項1〜12のいずれか一つに記載の組成物。
- 構造(I)中のnが1である、請求項1〜12のいずれか一つに記載の組成物。
- 以下を含む電子デバイスの製造方法、
a.基板上に請求項1〜14のいずれか一つに記載の組成物を塗布すること;そして、
b.150℃〜400℃の温度でフィルムをベーク処理すること。 - 前記基板はトポグラフィ形態を含むパターン化基体であり、ここで、フィルムをベークした後、さらに、以下の工程を含む請求項15に記載の電子デバイスの製造方法:
c.パターン化された基板の上部を覆う組成物を化学剥離剤またはフッ素化プラズマエッチングで除去する。 - パターン化された基板はパターン化された有機ポリマー層であり、ここで、更に以下の工程を含む請求項16に記載の電子デバイスの製造方法;
d.パターン化された有機ポリマーを酸素プラズマで除去し、それによって元のパターン化されたフォトレジストのネガ型画像を形成する。 - 前記基板が、中空のトポグラフィ形態を含むパターン形成された基板であり、ここで、フィルムを焼成した後、当該方法は更に以下の工程を含む請求項15に記載の電子デバイスの製造方法;
c.前記中空のトポグラフィ形態が前記金属酸化物材料で部分的に充填されるように、組成物を化学剥離剤またはフッ素化プラズマエッチングで除去すること。
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US20160230019A1 (en) | 2016-08-11 |
CN107251203A (zh) | 2017-10-13 |
CN107251203B (zh) | 2019-05-17 |
SG11201705487QA (en) | 2017-08-30 |
TW201639927A (zh) | 2016-11-16 |
KR20170116134A (ko) | 2017-10-18 |
US9499698B2 (en) | 2016-11-22 |
JP2018507933A (ja) | 2018-03-22 |
TWI669353B (zh) | 2019-08-21 |
EP3257069B1 (en) | 2018-11-21 |
WO2016128252A1 (en) | 2016-08-18 |
EP3257069A1 (en) | 2017-12-20 |
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