JP7367103B2 - 高分子処理用工程液組成物 - Google Patents
高分子処理用工程液組成物 Download PDFInfo
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Description
(前記化学式1において、
R1およびR2は、それぞれ独立して、C1~C18の直鎖もしくは分枝鎖炭化水素基、またはC3~C18の環状脂肪族炭化水素基であり、R1とR2は、環を形成してもよい。)
(前記化学式2において、
R3およびR5は、それぞれ独立して、C1~C18の直鎖もしくは分枝鎖の脂肪族炭化水素基、またはC3~C18の環状脂肪族炭化水素基であり、
R4は、C1~C18の直鎖もしくは分枝鎖の2価の脂肪族炭化水素基である。)
δD:15.5~19.0[MPa1/2]
δP:7.5~15.5[MPa1/2]
δH:4.5~9.5[MPa1/2]
本発明の高分子処理用工程液組成物は、フッ素化合物;ケトン系溶媒;および極性非プロトン性溶媒を含むことができ、その他の添加剤をさらに含むことができる。本発明の高分子処理用工程液組成物は、フッ素化合物に、特定化学式構造のケトン系溶媒および極性非プロトン性溶媒をすべて含み、特に、特定構造のケトン系溶媒を用いる時、極性非プロトン性溶媒とシナジー効果があることに特徴がある。
δD:15.5~19.0[MPa1/2]
δP:7.5~15.5[MPa1/2]
δH:4.5~9.5[MPa1/2]
δblend=Σ[φcomponentn×δcomponentn]
本発明の高分子処理用工程液は、1種以上のフッ素系化合物を含み、前記フッ素系化合物は、シリコーン高分子の環を切って分子量を減少させる役割を果たす。
前記化学式3において、R6~R9は、それぞれ独立して、炭素数3~10のアルキル基である。前記R6~R9が炭素数2以下のアルキル基の場合、溶媒に対するフッ素系化合物の溶解度が低下して、混合してすぐに析出が発生したり、やや時間が経過した後に析出が発生する問題が発生する。
前記化学式4において、R10~R12は、それぞれ独立して、炭素数1~10のアルキル基である。
前記化学式5において、R13~R16は、それぞれ独立して、炭素数1~22の脂肪族炭化水素、または炭素数6~20の芳香族炭化水素である。
前記化学式6において、R17~R19は、それぞれ独立して、炭素数1~22の脂肪族炭化水素、炭素数6~20の芳香族炭化水素である。
本発明において、ケトン系溶媒は、シリコーン高分子を膨張させ、フッ素化合物と分解されたシリコーン高分子を溶解させる役割を果たし、後述する極性非プロトン性溶媒との組み合わせにより多様な種類の金属に対する腐食抑制効果を向上させることができる。特に、本発明の特定構造を有するケトン系溶媒は、UVまたは熱によって硬化したシリコーン高分子表面の浸透性を向上させる役割に優れている。
前記化学式1において、R1およびR2は、それぞれ独立して、C1~C18の直鎖もしくは分枝鎖炭化水素基、またはC3~C18の環状脂肪族炭化水素基であり、R1とR2は、環を形成してもよい。R1およびR2は、同一でも異なっていてもよく、同一であることがより好ましい。
前記化学式2において、R3およびR5は、それぞれ独立して、C1~C18の直鎖もしくは分枝鎖の脂肪族炭化水素基、またはC3~C18の環状脂肪族炭化水素基であり、R4は、C1~C18の直鎖もしくは分枝鎖の2価の脂肪族炭化水素基である。R3およびR5は、同一でも異なっていてもよく、同一であることがより好ましい。
シリコーン高分子を膨張させ、フッ素化合物と分解されたシリコーン高分子を溶解させる役割を果たし、当該溶媒は、特にフッ素化合物によって分解されたシリコーンオリゴマーを溶解させる役割に優れている。
前記化学式7において、R20~R22は、それぞれ独立して、水素、C1~C10の直鎖もしくは分枝鎖の脂肪族炭化水素基、ハロゲン(例えば、F、Cl、Br、またはI)、アルデヒド基(-CHO)、アセトアルデヒド基(-COCH3)、C1~C4のアルコキシ基、ビニル基、アセチレン基、シアノ基(-CN)、またはメチルスルフィド基(-SCH3)であってもよい。
前記化学式8において、R23は、水素;C1~C6の直鎖もしくは分枝鎖の脂肪族炭化水素基;ビニル基;シアノ基(-CN);3級アミンによって置換されたC1~C4の脂肪族炭化水素基;C1~C4のアルキル基、シアノ基(-CN)、ハロゲン基(例えば、F、Cl、Br、I)、またはアルデヒド基(-CHO)によって置換されたフェニル基またはピリジン基であり、Xは、酸素または-NR24-であり、R24は、C1~C4の脂肪族炭化水素基である。
前記化学式9において、Xは、酸素または-NR24-であり、R24およびR25は、それぞれ独立して、C1~C6の直鎖、分枝鎖もしくは環状脂肪族炭化水素基;またはビニル基、フェニル基、アセチレン基、メトキシ基、またはジメチルアミノ基が置換されたC1~C4の脂肪族炭化水素基である。
前記化学式10において、R26~R28は、それぞれ独立して、C1~C8の直鎖もしくは分枝鎖の脂肪族炭化水素基;隣接する酸素と共に環を形成するC3~C8の2価の脂肪族炭化水素基;非置換またはC1~C4の脂肪族炭化水素基によって置換されたフェニル基;ハロゲン(例えば、F、Cl、Br、I)によって置換されたC2~C4の脂肪族炭化水素基またはハロゲンによって置換されたフェニル基である。
本発明の高分子処理用工程液の高分子除去性能を阻害しない範囲で、前記成分のほか、この分野にて通常使用される腐食防止剤、界面活性剤などの成分をさらに含むことができる。
下記表1に記載の成分および組成比によって高分子処理用工程液組成物を調製した。
A)TBAF・HF:テトラブチルアンモニウムビフルオライド
B)TBAF:テトラブチルアンモニウムフルオライドトリハイドレート
C)BTMAF:ベンジルテトラメチルアンモニウムフルオライドハイドレート
D)テトラブチルホスホニウムフルオライド
E)トリブチルスルホニウムフルオライド
前記実施例および比較例の高分子処理用工程液組成物に対してそれぞれ次の方法で実験を進行させて、その結果を下記表3に示した。
硬化したシリコーン高分子が50μmの厚さにコーティングされたウエハを2×2cm2の大きさに切断して用い、25℃の組成液を400rpmで回転させながら用意されたサンプルを1分間浸漬し、IPA洗浄後、乾燥した。評価後、SEMで硬化したシリコーン高分子の膜厚を測定した。その後、走査電子顕微鏡(scanning electron microscope、SEM)で残存するシリコーン系樹脂の膜厚を測定して、除去速度を下記数式1のように算出して、下記の評価基準により表3にまとめた。
除去速度(μm/min)=[評価前の厚さ(μm)-評価後の厚さ(μm)]/評価時間(min)
<評価基準>
○:除去速度20μm/min以上
△:除去速度10μm/min以上20μm/min未満
X:除去速度10μm/min未満
ポリジメチルシロキサンのプレポリマーと硬化剤とを所定の質量比で混合したブレンドをシリコンウエハ上にスピンコーティングし、2×2cm2の大きさに切断して用い、25℃の組成液を400rpmで回転させながら用意させたサンプルを1分間浸漬し、IPA洗浄後、乾燥した。評価後、光学顕微鏡とSEMでウエハ表面の残留物を観察した。
<評価基準>
○:残留物無し
X:残留物有り
本発明の高分子処理用工程液組成物が防食効果を示す金属は、Sn、Sn-Ag合金、Sn-Au合金、Sn-Ag-Cu合金を含むSn合金であるか、Sn/Cu、Sn/Ni、Sn/Ni/Cu、Sn-Ag/Cu、Sn-Ag/Ni、Sn-Ag/Ni/Cu、Sn-Au/Cu、Sn-Au/Ni、Sn-Au/Ni/Cu、Sn-Ag-Cu/Ni、Sn-Ag-Cu/Ni/Cu、Sn-Ag-Cu/Cuなどで構成された二重膜または三重膜、またはCu単独からなる金属膜であってもよいし、これに限定されない。
<評価基準>
○:5個未満
△:5個以上20個未満
X:20個以上発生
また、ニッケルめっき膜、銅薄膜、アルミニウム薄膜がそれぞれ形成されたウエハを2×2cm2の大きさに切断して用い、25℃の組成液を400rpmで回転させながら用意されたサンプルを60分間浸漬し、IPA洗浄後、乾燥した。そして、評価後、光学顕微鏡でパッドディフェクト(Defect)を確認した後、下記の基準により下記表3に表記した。
<評価基準>
○:表面モルフォロジー変化および変色無し
△:変色有り
X:変色および表面モルフォロジー変化有り
フッ素化合物と溶媒混合物の相安定性を判断するために、40℃の条件で1週間保管後、層分離または析出物の発生の有無を追加確認して、下記の基準により下記表3に表記した。
<評価基準>
○:相安定性問題無し
△:時間経過時に析出物発生
X:層分離または析出物発生
Claims (8)
- フッ素化合物;
ケトン系溶媒;および
極性非プロトン性溶媒を含み、
前記ケトン系溶媒は、下記化学式1または下記化学式2で表される化合物からなる群より選択される1種以上であり、
(前記化学式1において、
R1およびR2は、それぞれ独立して、C1~C18の直鎖もしくは分枝鎖炭化水素基、またはC3~C18の環状脂肪族炭化水素基であり、R1とR2は、環を形成してもよい。)
(前記化学式2において、
R3およびR5は、それぞれ独立して、C1~C18の直鎖もしくは分枝鎖の脂肪族炭化水素基、またはC3~C18の環状脂肪族炭化水素基であり、
R4は、C1~C18の直鎖もしくは分枝鎖の2価の脂肪族炭化水素基である。)
前記ケトン系溶媒と極性非プロトン性溶媒との混合溶媒のハンセン溶解度パラメータ(Hansen solubility parameter)値の範囲は、次を満たすことを特徴とする、高分子処理用工程液組成物。
δ D :15.5~19.0[MPa 1/2 ]
δ P :7.5~15.5[MPa 1/2 ]
δ H :4.5~9.5[MPa 1/2 ] - 前記ケトン系溶媒は、炭素数の合計が3個以上30個以下の化合物を含むことを特徴とする、請求項1に記載の高分子処理用工程液組成物。
- 前記ケトン系溶媒と極性非プロトン性溶媒との混合比率は、1:9~9:1であることを特徴とする、請求項1に記載の高分子処理用工程液組成物。
- 前記ケトン系溶媒は、2-ブタノン、ジシクロプロピルケトン、シクロプロピルメチルケトン、シクロペンタノン、シクロヘキサノン、シクロヘプタノン、3-ペンタノン、2-ペンタノン、3-メチル-2-ペンタノン、アセチルアセトン、4-メチル-2-ペンタノン、2-メチル-3-ペンタノン、3-ヘキサノン、2-ヘキサノン、ジシクロケトン、1-シクロペンチルエタノン、3-メチル-2-ヘキサノン、2-メチル-3-ヘキサノン、イソアミルケトン、アミルケトン、4-ヘプタノン、3-ヘプタノン、2-ヘプタノン、5-ノナノン、2,4-ジメチル-3-ペンタノン、エチル-イソブチルケトン、3,5-ジメチルシクロヘキサノン、2,6-ジメチルシクロヘキサノン、3-オクタノン、5-メチル-2-ヘキサノン、5-メチル-3-ヘプタノン、3-メチル-4-ヘプタノン、2,5-ジメチル-3-ヘキサノン、2,6-ジメチル-4-ヘキサノン、2-ウンデカノン、および2,6-ジメチル-4-ヘプタノンから選択される1種以上であることを特徴とする、請求項1に記載の高分子処理用工程液組成物。
- 前記フッ素化合物は、フッ化アルキルアンモニウム、フッ化アルキルホスホニウム、およびフッ化アルキルスルホニウムから選択される1種以上であることを特徴とする、請求項1に記載の高分子処理用工程液組成物。
- 極性非プロトン性溶媒は、アミド系溶媒、モルホリン系溶媒、ピロリジン系溶媒、ピロリドン系溶媒、ウレア系溶媒、ラクトン系溶媒、スルホキシド系溶媒、ホスフェート系溶媒、オキサゾリドン系溶媒、およびピペラジン系溶媒から選択される1種以上であることを特徴とする、請求項1に記載の高分子処理用工程液組成物。
- 組成物の総重量に対して、
前記フッ素化合物0.1~30重量%;および
前記ケトン系溶媒5~90重量%を含む、請求項1に記載の高分子処理用工程液組成物。 - 前記高分子処理用工程液組成物は、網状型高分子および線状高分子を除去するものである、請求項1に記載の高分子処理用工程液組成物。
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| US11009796B2 (en) * | 2017-09-22 | 2021-05-18 | Taiwan Semiconductor Manufacturing Co., Ltd. | Method for forming semiconductor structure |
| IL274880B2 (en) * | 2017-12-08 | 2024-04-01 | Basf Se | Composition and process for selectively etching a layer comprising an aluminium compound in the presence of layers of low-k materials, copper and/or cobalt |
| KR102192954B1 (ko) * | 2020-03-26 | 2020-12-18 | 동우 화인켐 주식회사 | 고분자 세정용 조성물 |
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| JP2020189927A (ja) | 2019-05-22 | 2020-11-26 | 信越化学工業株式会社 | 基板用仮接着剤の洗浄液、基板の洗浄方法および支持体または基板の洗浄方法 |
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