JP2012141614A - 塩基反応性成分を含む組成物およびフォトリソグラフィのための方法 - Google Patents
塩基反応性成分を含む組成物およびフォトリソグラフィのための方法 Download PDFInfo
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- JP2012141614A JP2012141614A JP2012000221A JP2012000221A JP2012141614A JP 2012141614 A JP2012141614 A JP 2012141614A JP 2012000221 A JP2012000221 A JP 2012000221A JP 2012000221 A JP2012000221 A JP 2012000221A JP 2012141614 A JP2012141614 A JP 2012141614A
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0046—Photosensitive materials with perfluoro compounds, e.g. for dry lithography
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
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- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
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Landscapes
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Materials For Photolithography (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
Abstract
【解決手段】塩基反応性基を有する1種以上の材料を含み、ドライリソグラフィに特に有用な新規フォトレジスト組成物が提供される。特に好ましいフォトレジストはレジストの塗膜層の現像後の欠陥を低減できる。塩基反応性基は、典型的なフォトレジスト現像条件、例えば、0.26Nのテトラブチルアンモニウムヒドロキシド現像剤組成物でのシングルパドル現像下で典型的に反応性である。
【選択図】なし
Description
より具体的には、本発明の好ましいフォトレジストは
(i)1種以上の樹脂、
(ii)1種以上の光酸発生剤化合物を適切に含むことができる光活性成分、並びに
(iii)1以上の塩基反応性基を含む1種以上の材料
を含むことができ、塩基反応性基は露光および露光後リソグラフィ処理工程の後で反応性である。好ましくは、塩基反応性基は0.26Nのテトラメチルアンモニウムヒドロキシド水性現像剤組成物のような水性アルカリ現像剤組成物での処理の際に反応性である。好ましくは、塩基反応性基を含むこのような材料は1種以上の樹脂と実質的に非混和性である。好ましい塩基反応性材料は1以上の塩基反応性基、例えば、フッ素化エステルなどを含む樹脂である。
1)248nmでの像形成に特に好適な化学増幅ポジ型レジストを提供できる、酸不安定基を含むフェノール系樹脂。この種の特に好ましい樹脂には、以下のものが挙げられる:i)ビニルフェノールおよびアクリル酸アルキルの重合単位を含むポリマー、ここにおいて、重合されたアクリル酸アルキル単位は光酸の存在下でデブロッキング(deblocking)反応を受けうる。光酸誘起デブロッキング反応を受けうる代表的なアクリル酸アルキルには、例えば、アクリル酸t−ブチル、メタクリル酸t−ブチル、アクリル酸メチルアダマンチル、メタクリル酸メチルアダマンチル、および光酸誘起反応を受けうる他の非環式アルキルおよび脂環式アクリラートが挙げられ、例えば、米国特許第6,042,997号および第5,492,793号におけるポリマーが挙げられ、これら文献は参照によって本明細書に組み込まれる:ii)ビニルフェノール、場合によって置換されている(ヒドロキシもしくはカルボキシ環置換基を含まない)ビニルフェニル(例えばスチレン)、および上記ポリマーi)で記載されたデブロッキング基を有するもののようなアクリル酸アルキルの重合単位を含むポリマー、例えば、米国特許第6,042,997号に記載されたポリマー、この文献は参照によって本明細書に組み込まれる:およびiii)光酸と反応しうるアセタールもしくはケタール部分を含む繰り返し単位、および場合によってフェニルもしくはフェノール性基のような芳香族繰り返し単位を含むポリマー;このようなポリマーは、米国特許第5,929,176号および第6,090,526号に記載されており、これら文献は参照によって本明細書に組み込まれる:並びにi)および/またはii)および/またはiii)のブレンド。
本発明の他の形態が以下に開示される。
上述のように、本発明の特に好ましいフォトレジストは水性アルカリ現像の後での欠点の低減を示すことができる。
好ましい塩基反応性基には、塩基(例えば、水性アルカリ現像剤組成物)での処理の際に単一のヒドロキシル基を提供できる部分が挙げられる。より具体的には、このような塩基反応性基を含む好適なモノマーには、以下の式(I)のものが挙げられる:
さらなる好ましい塩基反応性基には、塩基(例えば、水性アルカリ現像剤組成物)での処理の際に複数のヒドロキシル基を提供できる部分が挙げられる。より具体的には、このような塩基反応性基を含む好適なモノマーには、以下の式(II)のものが挙げられる:
さらなる好ましい塩基反応性基には、塩基(例えば、水性アルカリ現像剤組成物)での処理の際に1以上のカルボン酸基を提供できる部分が挙げられる。より具体的には、このような塩基反応性基を含む好適なモノマーには、以下の式(III)のものが挙げられる:
さらなる好ましい塩基反応性基には、塩基反応性材料(例えば、塩基反応性樹脂の繰り返し単位)の1つの繰り返し単位が複数の塩基反応性部分、例えば、2、3、4もしくは5個の塩基反応性部分、より典型的には2もしくは3個の塩基反応性部分を含む様な部分を含む。この種の典型的な好ましいモノマーには以下の構造が挙げられる。以下の構造においては、塩基反応性基を有するモノマーが左側に描かれ、塩基との反応後のヒドロキシル基を提供するモノマーは右側に描かれる。以下のモノマーも、現像の際に複数の極性(特に、ヒドロキシ)基を提供する典型的なモノマーである。
以下の実施例においては、モノマー1〜29のいずれかについての言及は保護された形態での先に示されたモノマー構造を含む(すなわち、アルカリ現像剤での後処理の前の構造が示される)。
A.モノマーおよび開始剤混合物:7.00gの
(CH=CH(CH3))C(=O)O(CH2)2)O(C=O)CF3(第1のモノマー)、および4.80gの
(CH2=CH)C(=O)OC(CH(CH3))2C(CH3)3(第2のモノマー)、0.42gのトリグノックス(Trignox)−23(開始剤)、並びに17.0gのPGMEA(溶媒)を供給バイアルに秤量。
B.反応器:反応器中に30gのPGMEA、85℃に維持。
C.AをBに供給:120分間一定の供給速度でAがBに供給される。
D.温度保持:AをBに供給した後で、反応器の温度は85℃でさらに2時間維持され、次いでこの反応器温度は自然に室温まで冷却された。
実施例1の手順に従って、以下のターポリマーおよびテトラポリマーが製造され、重合モノマー単位は以下に特定される:
35/55/10とはポリマー合成におけるそれぞれのモノマーの添加重量パーセントをいい、すなわち、この樹脂は35重量パーセントのGMA−DFAA、55重量パーセントのGMA−MDFA、および10重量パーセントの233tMBAからなるモノマー混合物を重合することにより製造される。
この樹脂は15重量パーセントのGMA−2233TFPA、20重量パーセントのGMA−DFAA、55重量パーセントのGMA−MDFA、および10重量パーセントの233tMBAからなるモノマー混合物を重合することにより製造される。
パート1:フォトレジスト製造
以下の表1に特定される材料を混合することにより、3種類のフォトレジスト組成物(以下に、レジストA、レジストBおよびレジストCとして特定)が製造された。全ての量は重量パーセントである。
ポリ−2:M5/M2/M6=35/40/25
PAG−1:4−tert−ブチルフェニルジフェニルスルホニウムペルフルオロブタンスルホナート
PAG−2:トリフェニルスルホニウムトリフラート
Q−1:トリイソプロパノールアミン
SLA−1:PolyFox656(フルオロジオール界面活性剤 サウスカロライナ州チャールストンのオムノバソリューションズから入手可能)
溶媒:A=PGMEA、B=シクロヘキサノン、C=メチル2−ヒドロキシイソブチラート
M1:2−メチルアダマンチルメタクリラート
M2:アルファ−ガンマ−ブチロラクトンメタクリラート
M3:5(または6)−シアノビシクロ[2.2.1]ヘプタン−2−イル−メタクリラート
M4:エタン−1,2−ジイルビス(オキシ)エタン−1,1−ジイル)ビス(2−メチルアクリラート)
M5:1−エチルシクロペンチルメタクリラート
M6:2−ヒドロキシアダマンチルメタクリラート
上記パート1で特定されるレジストA、BおよびCが、有機反射防止組成物の第1の層を有する別々のシリコンウェハ上にコーティングされ、そして110℃で60秒間プリベークされた。ASML1100 193nmスキャナ(NA=0.75)を用いて、ドライ露光が行われた。露光および未露光領域が造り出すためにチェッカーボードディフェクトマスクが使用され、75nmの1:1ラインアンドスペースパターンをプリントするためのサイジングエネルギー(26mJ)が露光のために使用された。露光後、膜は110℃で60秒間ベークされ、2.38重量%の水性テトラメチルアンモニウムヒドロキシド現像剤で現像された。KLA2351欠陥検査ツールによって欠陥カウントが測定され、結果は以下の表2に示される。
示された量で下記材料を混合することによりフォトレジスト組成物が製造される:
1.樹脂成分:フォトレジスト組成物の全重量を基準にして6.79重量%の量の(2−メチル−2−アダマンチルメタクリラート/ベータ−ヒドロキシ−ガンマ−ブチロラクトンメタクリラート/シアノ−ノルボルニルメタクリラート)のターポリマー;
2.光酸発生剤化合物:フォトレジスト組成物の全重量を基準にして0.284重量%の量のt−ブチルフェニルテトラメチレンスルホニウムペルフルオロブタンスルホナート;
3.塩基添加剤:フォトレジスト組成物の全重量を基準にして0.017重量%の量のN−アルキルカプロラクタム;
4.実質的に非混和性の添加剤(すなわち、塩基反応性樹脂):フォトレジスト組成物の全重量を基準にして0.213重量%の量の、上記実施例1で記載されるように製造された実施例1のポリマー;
5.溶媒成分:約90パーセントの流体組成物を提供するプロピレングリコールモノメチルエーテルアセタート。
このフォトレジスト層は次いで(約120℃などで)露光後ベークされ、そして0.26Nのアルカリ現像剤水溶液で現像される。
塩基反応性基を有する上記モノマーを用いたポリマーは、良好な現像剤切り替え能力を有しており、それにより当該ポリマーで増大された所望の親水性をレジスト表面に提供したことを示した。以下の表3に示されるのは、現像剤に曝露される前と後でのこのように増大したレジスト表面の接触角の例である。試験は、実質的に非混和性のポリマーの3%(レジストの全固形分に対して)添加量で60秒間の単純なパドル現像時間で、0.26Nのテトラメチルアンモニウムヒドロキシド現像剤組成物を用いて行われ、レジストは4.4%の全固形分量を有していた。
塩基反応性樹脂1が、実施例4に特定される種類のフォトレジスト組成物の全固形分(溶媒キャリアを除く全ての成分)の3重量パーセントで添加された(塩基反応性樹脂1が実施例3の実質的に非混和性の添加剤と交換された)。以下の表4に示されるのは、0.26Nのテトラメチルアンモニウムヒドロキシド現像剤組成物で処理される前と後でのこのフォトレジスト表面の接触角である。
上記実施例2で記載されるように製造された塩基反応性樹脂2が、実施例4に特定される種類のフォトレジスト組成物の全固形分(溶媒キャリアを除く全ての成分)の3重量パーセントで添加された(塩基反応性樹脂2が実施例4の実質的に非混和性の添加剤と交換された)。以下の表5に示されるのは、0.26Nのテトラメチルアンモニウムヒドロキシド現像剤組成物で処理される前と後でのこのフォトレジスト表面の接触角である。
Claims (12)
- (a)(i)1種以上の樹脂
(ii)光活性成分、および
(iii)前記1種以上の樹脂とは異なっており、塩基反応性基を含む1種以上の材料、
を含むフォトレジスト組成物を基体上に適用し、並びに
(b)適用されたフォトレジスト層を前記フォトレジスト組成物を活性化する放射線でドライ露光する
ことを含む、フォトレジスト組成物を処理する方法。 - 前記1種以上の材料が前記1種以上の樹脂と実質的に非混和性である請求項1に記載の方法。
- 前記1種以上の材料が、前記適用工程中にフォトレジスト組成物層の上部に向かって移動する請求項1または2に記載の方法。
- 前記(iii)1種以上の材料が、前記(i)1種以上の樹脂よりも低い表面エネルギーを有する請求項1〜3のいずれか1項に記載の方法。
- 塩基と反応してヒドロキシ、カルボキシもしくはスルホン酸基を提供する基を前記1種以上の材料が含む請求項1〜4のいずれか1項に記載の方法。
- 前記塩基反応性基を含む1種以上の材料が樹脂を含み、当該塩基反応性樹脂が複数の塩基反応性部分を含む繰り返し単位を含む、請求項1〜5のいずれか1項に記載の方法。
- 塩基反応性基がフッ素化エステルを含む請求項1〜6のいずれか1項に記載の方法。
- 前記1種以上の材料が1以上のフッ素基もしくはフッ素置換基を含む請求項1〜6のいずれか1項に記載の方法。
- 前記1種以上の材料が樹脂である請求項1〜8のいずれか1項に記載の方法。
- 前記1種以上の材料が光酸不安定基を含む請求項1〜9のいずれか1項に記載の方法。
- 露光されたフォトレジスト層を水性アルカリ現像剤で現像し、それにより1以上の塩基反応性基が結合開裂反応を受けて1以上の極性基を提供することをさらに含む、請求項1〜10のいずれか1項に記載の方法。
- 現像後のフォトレジスト層が30°未満の水後退接触角を有し、および/または現像前のフォトレジスト層が40°を超える水後退接触角を有する請求項11に記載の方法。
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KR20120078660A (ko) | 2012-07-10 |
US20120171626A1 (en) | 2012-07-05 |
EP2472320A2 (en) | 2012-07-04 |
TWI486711B (zh) | 2015-06-01 |
CN102681336A (zh) | 2012-09-19 |
US9436082B2 (en) | 2016-09-06 |
JP6108662B2 (ja) | 2017-04-05 |
TW201234109A (en) | 2012-08-16 |
CN102681336B (zh) | 2017-04-12 |
KR101841454B1 (ko) | 2018-03-23 |
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