JP5305744B2 - 有機反射防止膜用共重合体および組成物 - Google Patents
有機反射防止膜用共重合体および組成物 Download PDFInfo
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- JP5305744B2 JP5305744B2 JP2008147792A JP2008147792A JP5305744B2 JP 5305744 B2 JP5305744 B2 JP 5305744B2 JP 2008147792 A JP2008147792 A JP 2008147792A JP 2008147792 A JP2008147792 A JP 2008147792A JP 5305744 B2 JP5305744 B2 JP 5305744B2
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- antireflection film
- organic antireflection
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- 230000001788 irregular Effects 0.000 description 1
- 125000004184 methoxymethyl group Chemical group [H]C([H])([H])OC([H])([H])* 0.000 description 1
- 238000001393 microlithography Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Substances [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 1
- 238000001029 thermal curing Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- HADKRTWCOYPCPH-UHFFFAOYSA-M trimethylphenylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C1=CC=CC=C1 HADKRTWCOYPCPH-UHFFFAOYSA-M 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
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- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/04—Anhydrides, e.g. cyclic anhydrides
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- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
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- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1807—C7-(meth)acrylate, e.g. heptyl (meth)acrylate or benzyl (meth)acrylate
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- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
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- C09D131/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Coating compositions based on derivatives of such polymers
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- C09D135/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical, and containing at least another carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D135/06—Copolymers with vinyl aromatic monomers
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- 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
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
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- 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
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- 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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- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
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- 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
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/091—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by antireflection means or light filtering or absorbing means, e.g. anti-halation, contrast enhancement
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
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- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
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- C08L31/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid; Compositions of derivatives of such polymers
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- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
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- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S438/00—Semiconductor device manufacturing: process
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Description
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、
、
から選択され、R2及びR3は互いに独立であり、水素,炭素原子1〜10のアルキル基または炭素原子1〜10のアルコキシ基を表す。
無水マレイン酸29.4g、メチルメタクリレート30g、AIBN2.97gを1,4−ジオキサン120gに溶解させた後、70℃で12時間にわたり重合反応させた。反応が完了した後に反応溶液をメチルアルコールに落下して生成された沈殿物を濾過し、メチルアルコールで何度も洗浄し、真空乾燥させた(Mw=17,200、PDI=2.95、収率=58%)。真空乾燥された重合体72g及びトルエンスルホン酸モノハイドレート0.55gをメチルアルコール725gに混合した後、70℃で48時間にわたり反応させた。反応が完了した後、反応溶液を蒸留水に落下して生成された沈殿物を濾過し、蒸留水で何度も洗浄して真空乾燥させた(収率58%)。
無水マレイン酸56.5g、ベンジルメタクリレート100g、AIBN4.67gを1,4−ジオキサン480.94gに溶解させた後、80℃で20時間にわたり重合反応させた。反応が完了した後、反応溶液をメチルアルコールに落下して生成された沈殿物を濾過し、メチルアルコールで何度も洗浄して真空乾燥させた(Mw=17,200、PDI=2.95、収率=53%)。真空乾燥された重合体82.95g及びトルエンスルホン酸モノハイドレート4.23gをメチルアルコール71200gに混合した後、80℃で48時間にわたり反応させた。反応が完了した後に反応溶液を蒸留水に落下して生成された沈殿物を濾過し、蒸留水で何度も洗浄して真空乾燥させた(収率53%)。
シグマアルドリッチから購買したスチレン−無水マレイン酸重合体(Mn=1600、スチレンのモル数:無水マレイン酸のモル数=1.3:1)100g及びトルエンスルホン酸モノハイドレート0.77gをメチルアルコール1000gに混ぜ、70℃で48時間にわたり反応させる。反応の完了した後に反応溶液を蒸留水に落下して生成された沈殿物を濾過し、蒸留水で何度も洗浄して真空乾燥させる。
ビスフェノールAジグリシジルエーテル21.80g、4−ヒドロキシベンゾ酸17.69g、及びトリエチルアミン0.37gをプロピレングリコールモノメチルエーテルアセテート78.98gに溶解させた後、120℃で18時間にわたり反応させる。反応が終わった後に常温までに反応溶液を冷やし、容器に盛り入れる。
トリス(2−カルボキシエチル)イソシアヌレート200g、1,2−エポキシ−3−フェノキシ−プロパン260.9g、及びトリエチルアミン3.52gを1,4−ジオキサン928.8gに混ぜた後、120℃で18時間にわたり反応させる。反応が完了した後、溶媒を蒸発機で除去しメチレンクロライドに溶解させて2%塩酸水溶液と蒸留水で何度も洗浄する。蒸発機を用いて溶媒を除去して反応物を得る。
4,4’−オキシビスベンゾ酸100g、1,2−エポキシ−3−フェノキシ−プロパン116.31g、及びテトラブチルアンモニウムブロマイド6.24gをプロピレングリコールモノメチルエーテルアセテート457.58gに混ぜた後、120℃で18時間反応させる。反応が終わった後、常温まで反応溶液を冷やし、容器に盛り入れる。
スルホニルジベンゾ酸50g、1,2−エポキシ−3−フェノキシ−プロパン49.03g、及びテトラブチルアンモニウムブロマイド5.26gを、ジメチルホルムアミド208.58gに混ぜた後、120℃で18時間反応させる。反応の終わった後、常温まで反応溶液を冷やし、ヘキサンと水を用いて固体を生成させた後に水で何度も洗浄する。真空オーブンで乾燥して反応物を得る。
合成例1で製造された有機反射防止膜用重合体7g、合成例3で製造された吸光剤A6g、テトラメトキシメチルグリコールウリル2gと、化学式23の構造を有する熱酸発生剤1gをプロピレングリコールモノメチルエーテルアセテート966gに溶解させた後、孔径0.2μmメンブレインフィルターで濾過することにより、有機反射防止膜組成物Aを製造した。
合成例1で製造された有機反射防止膜用重合体7g、合成例3で製造された吸光剤A8gとテトラメトキシメチルグリコールウリル2.1g、化学式23の構造を有する熱酸発生剤1gをエチルラクテート981.9gに溶解させた後、孔径0.2μmメンブレインフィルターで濾過することにより、有機反射防止膜組成物Bを製造した。
合成例1で製造された有機反射防止膜用重合体8g、合成例4で製造された吸光剤B10g、テトラメトキシメチルグリコールウリル2.7g、及び化学式23の構造を有する熱酸発生剤0.54gをプロピレングリコールモノメチルエーテルアセテート978.76gに溶解させた後、孔径0.2μmメンブレインフィルターで濾過することにより、有機反射防止膜組成物Cを製造した。
合成例1で製造された有機反射防止膜用重合体8g、合成例5で製造された吸光剤C 6g、テトラメトキシメチルグリコールウリル2.8g、及び化学式23の構造を有する熱酸発生剤0.54gをプロピレングリコールモノメチルエーテルアセテート982.66gに溶解させた後、孔径0.2μmメンブレインフィルターで濾過することにより、有機反射防止膜組成物Dを製造した。
合成例1で製造された有機反射防止膜用重合体8g、合成例6で製造された吸光剤D 4g、テトラメトキシメチルグリコールウリル1.7g、及び化学式23の構造を有する熱酸発生剤0.4gをプロピレングリコールモノメチルエーテルアセテート985.9gに溶解させた後、孔径0.2μmメンブレインフィルターで濾過することにより、有機反射防止膜組成物Eを製造した。
合成例1で製造された有機反射防止膜用重合体8g、合成例7で製造された吸光剤E 4g、テトラメトキシメチルグリコールウリル1.7g、及び化学式23の構造を有する熱酸発生剤0.4gをプロピレングリコールモノメチルエーテルアセテート985.9gに溶解させた後、孔径0.2μmメンブレインフィルターで濾過することにより、有機反射防止膜組成物Fを製造した。
合成例2で製造された有機反射防止膜用重合体5g、合成例7で製造された吸光剤E 5g、テトラメトキシメチルグリコールウリル1.4g、及び化学式23の構造を有する熱酸発生剤0.3gをプロピレングリコールモノメチルエーテルアセテート988.3gに溶解させた後、孔径0.2μmメンブレインフィルターで濾過することにより、有機反射防止膜組成物Gを製造した。
実施例1〜7で製造された有機反射防止膜組成物をシリコンウェハ上にスピン塗布させた後、230℃のホットプレート上で1分間ベーキングして架橋させて有機反射防止膜を形成した。有機反射防止膜の厚さを測定し、有機反射防止膜がコーティングされたウェハを溶媒のエチルラクテートに1分間浸けた。その後、エチルラクテートを完全に除去し100℃のホットプレート上で1分間ベーキングした後、再度有機反射防止膜の厚さを測定した。測定の結果、エチルラクテート処理後の膜の厚さと処理前の膜の厚さの変化は観察できなかった。即ち、製造された有機反射防止膜組成物はベーク工程中に完全硬化され、リソグラフィ工程進行中にフォトレジストとのインターミキシングが起こらないことが確認された。
実施例1〜7で製造された有機反射防止膜組成物をシリコンウェハ上にスピン塗布させた後、230℃のホットプレート上で1分間ベーキングして架橋させて有機反射防止膜を形成した。反射防止膜に関して、分光エリプソメーターを用いて193nmで屈折率(n)と消光係数(k)を測定した。測定の結果、有機反射防止膜組成物Aの屈折率(n)は1.66であり、消光係数(k)は0.32であり、有機反射防止膜組成物Bの屈折率(n)は1.73であり、消光係数(k)は0.30であった。また、有機反射防止膜組成物Cの屈折率(n)は1.78であり、消光係数(k)は0.32であった。
実施例1で製造された有機反射防止膜組成物を、シリコンオキシナイトライドの蒸着されたシリコンウェハ上にスピン塗布させた後、230℃のホットプレート上で1分間ベーキングして架橋させて有機反射防止膜を形成した。その後、反射防止膜上にJSR(株)製のフォトレジストを塗布し、130℃で90秒間ベーキングした。ベーキングが終了した後、ASML1400スキャナー装置(0.85NA)と、80nm1:1 L/Sパターンマスクを用いて露光させ、130℃で90秒間再度ベーキングした。露光したウェハをTMAH2.38質量%の現像液を用いて現像し、最終のフォトレジストパターンを得た。
実施例で製造された有機反射防止膜組成物をシリコンウェハ上にスピン塗布させた後、230℃のホットプレート上で1分間ベーキングして架橋させ、有機反射防止膜を形成した。有機反射防止膜が形成されたシリコンウェハをドライエッチング装置上、CF4ガスを用いて10秒間エッチングした。エッチング速度は(エッチング前の膜の厚さ−エッチング後の膜の厚さ)/時間として定義した。これを乾式エッチング選択性で換算した結果、有機反射防止膜組成物A、B、CのそれぞれのCF4ガスエッチング速度はそれぞれ2.25、2.35、2.20であった。乾式エッチング選択性は、ArFリソグラフィ用フォトレジスト(金湖石油化学(株)製、商品名KUPR−A60)の乾式エッチング速度を1.00にした場合における有機反射防止膜の乾式エッチング速度を示したものである。
Claims (17)
- 化学式1で示される有機反射防止膜用共重合体。
- 化学式24で示される有機反射防止膜用共重合体、吸光剤、熱酸発生剤、および硬化剤を含む有機反射防止膜組成物。
- 前記吸光剤は、化学式8で示される共重合体であり、重量平均分子量が1000〜100000である請求項2に記載の有機反射防止膜組成物。
- 前記吸光剤は、化学式14、19または20で示される化合物である請求項2に記載の有機反射防止膜組成物。
- 前記硬化剤は、1化合物当たり2個以上の架橋形成官能基を有し、アミノプラスチック化合物、多官能性エポキシレジン、無水物およびこれらの混合物からなる群より選択されたものである請求項2から4のいずれかに記載の有機反射防止膜組成物。
- 前記架橋形成官能基は、グリコールウリル化合物、尿素化合物、ベンゾグアナミン化合物のメラミン化合物のアミノ基の水素原子がメチロール基またはアルコキシメチロール基、オキセタニル基、オキサゾリン基、シクロカーボネート基、アルコキシシリル基、アミノメチロール基、アルコキシメチル基、アジリジニル基、メチロール基、イソシアネート基、アルコキシメチルアミノ基、および多官能性エポキシ基からなる群より選択された1種以上のものである請求項5に記載の有機反射防止膜組成物。
- 前記熱酸発生剤は、化学式21〜23の化合物を含む請求項2に記載の有機反射防止膜組成物。
- プロピレングリコールモノメチルエーテル(PGME)、プロピレングリコールモノメチルエーテルアセテート(PGMEA)、シクロヘキサノン、エチルラクテート、プロピレングリコールn−プロピルエーテル、ジメチルホルムアミド(DMF)、γ−ブチロラクトン、エトキシエタノール、メトキシエタノール、メチル3−メトキシプロピオネート(MMP)、およびエチル3−エトキシプロピオネート(EEP)からなる群より選択された1種以上の溶媒を含む請求項2に記載の有機反射防止膜組成物。
- 前記有機反射防止膜用共重合体0.1〜40重量%、前記吸光剤0.1〜40重量%、前記熱酸発生剤0.01〜20重量%、および前記硬化剤0.01〜40重量%を含む請求項2に記載の有機反射防止膜組成物。
- 化学式1は、無水マレイン酸及びアルキルアクリレート系化合物を重合させて製造された化学式2の反応中間体と、炭素数1〜10のアルキルアルコールとを反応させてなる請求項1に記載の有機反射防止膜用共重合体。
- 前記アルキルアクリレート系化合物は、メチルアクリレート、エチルアクリレート、イソプロピルアクリレート、ノーマルプロピルアクリレート、ノーマルブチルアクリレート、イソブチルアクリレート、tert−ブチルアクリレート、シクロヘキシルアクリレート、イソボロニルアクリレート、2−エチルヘキシルアクリレート、メチルメタクリレート、エチルメタクリレート、イソプロピルメタクリレート、ノーマルプロピルメタクリレート、tert−ブチルメタクリレート、ノーマルブチルメタクリレート、イソブチルメタクリレート、シクロヘキシルメタクリレート、イソボロニルメタクリレート、及び2−エチルヘキシルメタクリレートからなる群より選択されたものである請求項10に記載の有機反射防止膜用共重合体。
- 前記化学式8は無水マレイン酸とスチレン化合物を重合させて製造された以下の化学式9の共重合体と、炭素数1−10のアルキルアルコールとを反応させて生成される吸光剤である請求項3に記載の有機反射防止膜組成物。
- 請求項2から4のいずれかに記載の有機反射防止膜組成物を被エッチング層上に塗布する工程と、
塗布された組成物を、ベーク工程を通じて硬化させ、架橋結合を形成させて有機反射防止膜を形成する防止膜形成工程と、
有機反射防止膜上にフォトレジストを塗布し、露光後に現像してフォトレジストパターンを形成する工程と、
フォトレジストパターンをエッチングマスクにして有機反射防止膜をエッチングした後、被エッチング層をエッチングして被エッチング層のパターンを形成する工程と、を含む半導体素子のパターン形成方法。 - 前記ベーク工程を150〜250℃で1〜5分間にわたって行う請求項13に記載の半導体素子のパターン形成方法。
- フォトレジストパターン形成工程のうち露光の前後において、第2ベーク工程をさらに含む請求項13または14に記載の半導体素子のパターン形成方法。
- 前記第2ベーク工程を70〜200℃で行う請求項15に記載の半導体素子のパターン形成方法。
- 請求項13から16のいずれかに記載のパターン形成方法によって製造された半導体素子。
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