JP5251433B2 - レジスト下層膜形成用組成物及びパターン形成方法 - Google Patents
レジスト下層膜形成用組成物及びパターン形成方法 Download PDFInfo
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- JP5251433B2 JP5251433B2 JP2008280651A JP2008280651A JP5251433B2 JP 5251433 B2 JP5251433 B2 JP 5251433B2 JP 2008280651 A JP2008280651 A JP 2008280651A JP 2008280651 A JP2008280651 A JP 2008280651A JP 5251433 B2 JP5251433 B2 JP 5251433B2
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- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- DLFVBJFMPXGRIB-UHFFFAOYSA-N thioacetamide Natural products CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 description 1
- UWIVZLWKBOZJFG-UHFFFAOYSA-N thiolan-1-ium trifluoromethanesulfonate Chemical compound C1CC[SH+]C1.[O-]S(=O)(=O)C(F)(F)F UWIVZLWKBOZJFG-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
- FAYMLNNRGCYLSR-UHFFFAOYSA-M triphenylsulfonium triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 FAYMLNNRGCYLSR-UHFFFAOYSA-M 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 150000007934 α,β-unsaturated carboxylic acids Chemical class 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
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Description
本発明のレジスト下層膜形成用組成物は、2つ以上のフェノール性水酸基、及び、アルキルチエニル基を有する芳香族環を繰り返し構造単位として含むノボラック樹脂(A)と、有機溶剤(B)と、を含有するものである。このようなレジスト下層膜形成用組成物は、パターン転写性(特に、反応性イオンエッチング(RIE)でのレジスト曲がり耐性)に優れた下層膜を形成することができる。即ち、エッチング耐性に優れ、特に、ドライエッチングプロセスにおいて、オーバーエッチングが少なく、下層膜パターンが折れ曲がり難い(曲がり耐性を有する)下層膜を形成することができ、レジストパターンを忠実に再現性よく被加工基板に転写することができる。従って、本発明のレジスト下層膜形成用組成物によれば、各種の放射線を用いるリソグラフィープロセスにおける微細加工、特に高集積回路素子の製造において歩留りの向上が期待できる。
ノボラック樹脂(A)の有するフェノール性水酸基は、2つ以上であり、2〜4個であることが好ましい。フェノール性水酸基の数が1つであると、曲がり耐性が十分に得られない。
有機溶剤(B)は、ノボラック樹脂(A)を溶解させることができるものであれば特に限定されるものではない。例えば、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールモノ−n−プロピルエーテル、エチレングリコールモノ−n−ブチルエーテル等のエチレングリコールモノアルキルエーテル類;エチレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテルアセテート、エチレングリコールモノ−n−プロピルエーテルアセテート、エチレングリコールモノ−n−ブチルエーテルアセテート等のエチレングリコールモノアルキルエーテルアセテート類;ジエチレングリコールジメチルエーテル、ジエチレングリコールジエチルエーテル、ジエチレングリコールジ−n−プロピルエーテル、ジエチレングリコールジ−n−ブチルエーテル等のジエチレングリコールジアルキルエーテル類;トリエチレングリコールジメチルエーテル、トリエチレングリコールジエチルエーテル等のトリエチレングリコールジアルキルエーテル類;
本発明のレジスト下層膜形成用組成物は、所望の効果を損なわない範囲で、必要に応じて、酸発生剤(C)、架橋剤(D)、及び添加剤(E)等のその他の成分を含有させることができる。
本発明のパターン形成方法は、本発明のレジスト下層膜形成用組成物を被加工基板上に塗布してレジスト下層膜を形成する(1)工程と、形成されたレジスト下層膜上に、レジスト組成物を塗布してレジスト被膜を形成する(2)工程と、形成されたレジスト被膜に、所定のマスクパターンが形成されたフォトマスクを介して選択的に放射線を照射してレジスト被膜を露光する(3)工程と、露光したレジスト被膜を現像して、レジストパターンを形成する(4)工程と、レジストパターンをマスクとして用い、レジスト下層膜及び被加工基板をドライエッチングして、被加工基板に所定のパターンを形成する(5)工程と、を備えるものである。
(1)工程は、本発明のレジスト下層膜形成用組成物を被加工基板上に塗布してレジスト下層膜を形成する工程である。この工程によって、被加工基板上にレジスト下層膜が形成されたレジスト下層膜付き基板を得ることができる。
(2)工程は、形成されたレジスト下層膜上に、レジスト組成物を塗布してレジスト被膜を形成する工程である。なお、上記した(1−1)工程を行って中間層を形成した場合には、中間層上にレジスト被膜を形成する。
(3)工程は、形成されたレジスト被膜に、選択的に放射線を照射してレジスト被膜を露光する工程である。選択的に放射線を照射する方法としては、例えば、所定のマスクパターンが形成されたフォトマスクを介して、レジスト被膜に放射線を照射する方法を挙げることができる。
(4)工程は、露光したレジスト被膜を現像して、レジストパターンを形成する工程である。
(5)工程は、レジストパターンをマスクとして用い、レジスト下層膜及び被加工基板をドライエッチングして、被加工基板に所定のパターンを形成する工程である。なお、レジスト下層膜上に中間層を形成した場合には、レジスト下層膜及び被加工基板とともに中間層もドライエッチングする。
コンデンサー、温度計及び攪拌装置を備えた反応装置に、2,7−ジヒドロキシナフタレン100部、プロピレングリコールモノメチルエーテルアセテート100部、及びパラホルムアルデヒド50部を仕込み、蓚酸2部を添加し、脱水しながら120℃に昇温、5時間反応させることにより重合体(縮合反応物)(a1)を得た。重合体(a1)は、1H−NMR分析によって下記式(2)で表される構造を有することを確認した。また、重合体(a1)の重量平均分子量(Mw)は1500であった。
コンデンサー、温度計及び攪拌装置を備えた反応装置に、合成例1で得られた重合体(a1)125部、チオフェンメタノール25部、p−トルエンスルホン酸20部、及び、メチルイソブチルケトン150部を仕込み、100℃に昇温、4時間反応させることにより重合体(縮合反応物)(A1)を得た。重合体(A1)は、1H−NMR分析によって下記式(3)で表される構造を有することを確認した。また、重合体(A1)の重量平均分子量(Mw)は2800であった。
2,6−ジヒドロキシナフタレンを用いた以外は、合成例1と同様の手法にて、重合体(縮合反応物)(a2)を得た。重合体(a2)は、1H−NMR分析によって下記式(4)で表される構造を有することを確認した。また、重合体(a2)の重量平均分子量(Mw)は1500であった。
合成例3で得られた重合体(a2)を用いた以外は、合成例2と同様の手法にて、重合体(縮合反応物)(A2)を得た。重合体(A2)は、1H−NMR分析によって下記式(5)で表される構造を有することを確認した。また、重合体(A2)の重量平均分子量(Mw)は2800であった。
重合体(A1)100部及び界面活性剤0.005部を、シクロヘキサノン(有機溶剤(B))450部に溶解した。その後、この溶液を孔径0.1μmのメンブランフィルターでろ過することにより、レジスト下層膜形成用組成物を調製した。調製したレジスト下層膜形成用組成物について、以下の評価を行った。
直径8インチのシリコンウエハ上に、レジスト下層膜形成用組成物をスピンコート法により塗布した。その後、酸素濃度20容量%のホットプレート内にて、180℃で60秒間加熱した。引き続き、350℃で120秒間加熱して、膜厚0.3μmの下層膜を形成した。
(1)下層膜の形成で形成した下層膜について、炭素・水素・窒素同時定量装置「JM10」(ジェイ・サイエンス・ラボ社製)を用いて、各元素の質量換算値を算出した。その後、膜中に含まれる各元素(炭素・水素・窒素)の原子数を、式:各元素の質量換算値(質量%)/各元素の質量(g)により算出した。次いで、式:膜中の原子数/膜中の全原子数により、下層膜中の元素(炭素・水素・窒素)組成(atom%)を算出した。表1中、「元素組成(atom%)」と示す。
(1)下層膜の形成で形成した下層膜上に、3層レジストプロセス用中間層形成組成物溶液(JSR社製の商品名「NFC SOG508」)をスピンコートし、200℃のホットプレート上で60秒間加熱した。引き続き、300℃のホットプレート上で60秒間加熱して、膜厚0.05μmの中間層被膜を形成した。その後、中間層被膜上に、ArF用レジスト組成物溶液(JSR社製の商品名「NFC AIM5056」)をスピンコートし、130℃のホットプレート上で90秒間プレベークして、膜厚0.2μmのレジスト被膜を形成した。
○:下層膜のパターンが立っている状態
×:下層膜のパターンが倒れたり、曲がったりしている状態
(1)下層膜の形成で形成した下層膜を、エッチング装置(神鋼精機社製の「EXAM」)を使用して、CF4/Ar/O2(CF4:40mL/分、Ar:20mL/分、O2:5mL/分;圧力:20Pa;RFパワー:200W;処理時間:40秒;温度:15℃)の条件でエッチング処理した。このときのエッチング処理前後の膜厚を測定して、エッチングレートを算出し、エッチング耐性を評価した。評価基準は以下の通りである。なお、表1中、「エッチングレート」と示す。
○:エッチングレートが150nm/分以下の場合
△:エッチングレートが150nm/分を超え、200nm/分未満の場合
×:エッチングレートが200nm/分以上の場合
シリコン基板上に、スピンコート法によりレジスト下層膜形成用組成物を塗布し、200℃で60秒間焼成して膜厚300nmの下層膜を得た。その後、分光エリプソメーター「VUV−VASE」(J.A.Woollam社製)を用いて、波長193nmにおける光学定数(屈折係数)を算出した(表1中、「屈折係数」と示す)。なお、屈折係数が1.40〜1.60の範囲内であると、ArF露光レジスト工程において、反射防止膜として十分な機能を有するものと判断することができる。
シリコン基板上に、スピンコート法によりレジスト下層膜形成用組成物を塗布し、200℃で60秒間焼成して膜厚300nmの下層膜を得た。その後、分光エリプソメーター「VUV−VASE」(J.A.Woollam社製)を用いて、波長193nmにおける光学定数(消衰係数)を算出した(表1中、「消衰係数」と示す)。なお、消衰係数が0.25〜0.40の範囲内であると、ArF露光レジスト工程において、反射防止膜として十分な機能を有するものと判断することができる。
重合体(A2)を用いた以外は、実施例1と同じ手法にて、レジスト下層膜形成用組成物を調製した。調製したレジスト下層膜形成用組成物について、実施例1と同様にして各評価を行った。評価結果を表1に示す。
合成例1で得られた重合体(a1)100部及び界面活性剤0.005部を、シクロヘキサノン(有機溶剤(B))450部に溶解して溶液を得た。その後、この溶液を孔径0.1μmのメンブランフィルターでろ過することによりレジスト下層膜形成用組成物を調製した。調製したレジスト下層膜形成用組成物について、実施例1と同様にして各評価を行った。評価結果を表1に示す。
Claims (5)
- 2つ以上のフェノール性水酸基、及び、アルキルチエニル基を有する芳香族環を繰り返し構造単位として含むノボラック樹脂(A)と、
有機溶剤(B)と、を含有するレジスト下層膜形成用組成物。 - 前記ノボラック樹脂は、分子中にフェノール性水酸基を2つ以上有する化合物、及び、縮合剤の反応により得られた縮合反応物と、チエニル基を有するアルコールまたはアルデヒドとの反応により得られたものである請求項1に記載のレジスト下層膜形成用組成物。
- 前記分子中にフェノール性水酸基を2つ以上有する化合物が、ジヒドロキシベンゼン誘導体、ジヒドロキシナフタレン誘導体、及び、ジヒドロキシアントラセン誘導体からなる群より選択される少なくとも1種の化合物である請求項2に記載のレジスト下層膜形成用組成物。
- 前記縮合剤がアルデヒドである請求項2または3に記載のレジスト下層膜形成用組成物。
- 請求項1〜4のいずれか一項に記載のレジスト下層膜形成用組成物を被加工基板上に塗布してレジスト下層膜を形成する(1)工程と、
形成された前記レジスト下層膜上に、レジスト組成物を塗布してレジスト被膜を形成する(2)工程と、
形成された前記レジスト被膜に、選択的に放射線を照射して前記レジスト被膜を露光する(3)工程と、
露光した前記レジスト被膜を現像して、レジストパターンを形成する(4)工程と、
前記レジストパターンをマスクとして用い、前記レジスト下層膜及び前記被加工基板をドライエッチングして、前記被加工基板に所定のパターンを形成する(5)工程と、を備えるパターン形成方法。
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