JP6809843B2 - パターン形成方法 - Google Patents
パターン形成方法 Download PDFInfo
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- JP6809843B2 JP6809843B2 JP2016160898A JP2016160898A JP6809843B2 JP 6809843 B2 JP6809843 B2 JP 6809843B2 JP 2016160898 A JP2016160898 A JP 2016160898A JP 2016160898 A JP2016160898 A JP 2016160898A JP 6809843 B2 JP6809843 B2 JP 6809843B2
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- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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Description
(a)上記パターン露光工程における電離放射線又は非電離放射線の照射によって、酸と、一括露光工程における非電離放射線を吸収する感放射線性増感体とを発生し、かつ上記一括露光工程の際、上記パターン露光工程の未露光部において上記酸及び感放射線性増感体が実質的に発生しない感放射線性酸−増感体発生剤
(b)上記パターン露光工程における電離放射線又は非電離放射線の照射によって、一括露光工程における非電離放射線を吸収する感放射線性増感体を発生し、かつ上記一括露光工程の際、上記パターン露光工程の未露光部において上記感放射線性増感体が実質的に発生しない感放射線性増感体発生剤
(c)上記パターン露光工程における電離放射線又は非電離放射線の照射によって、酸を発生し、かつ上記一括露光工程の際、上記パターン露光工程の未露光部において上記酸が実質的に発生しない感放射線性酸発生剤
本実施形態のパターン形成方法は、基板上に形成された反射防止膜上に化学増幅型レジスト材料を使用してレジスト材料膜を形成する膜形成工程と、上記レジスト材料膜に、電離放射線又は400nm以下の波長を有する非電離放射線(以下、「第一の放射線」ともいう。)を照射するパターン露光工程と、上記パターン露光工程後の上記レジスト材料膜に、上記パターン露光における非電離放射線より長く、かつ200nmを超える波長を有する非電離放射線(以下、「第二の放射線」ともいう。)を照射する一括露光工程と、上記一括露光工程後の上記レジスト材料膜を加熱するベーク工程と、上記ベーク工程後の上記レジスト材料膜を現像液に接触させる現像工程とを主に備える。
工程S1:加工対象の基板を準備する工程
工程S2:下層膜及びレジスト材料膜を形成する工程(膜形成工程)
工程S3:パターン露光により、露光部に酸を発生させる工程(パターン露光工程)
工程S4:一括露光により、パターン露光部のみに酸を増殖させる工程(一括露光工程)
工程S5:露光後ベークにより、パターン露光部に酸触媒による極性変化反応を生じさせる工程(ベーク工程)
工程S6:現像処理によってレジストパターンを形成する工程(現像工程)
工程S7:エッチングによってパターンを転写する工程
以下の工程において加工対象となる基板(被加工基板)は、シリコン基板、二酸化シリコン基板、ガラス基板、及びITO基板等の半導体ウエハから構成されたものであってもよく、上記半導体ウエハ上に絶縁膜層が形成されたものであってもよい。
本工程では、上記基板上に形成された反射防止膜上にレジスト材料膜を形成する。反射防止膜を形成することにより、パターン露光工程S3において放射線が基板等で反射することによる定在波の発生を抑制することができる。このような反射防止膜としては、公知の反射防止膜を用いることができる。
本実施形態に係る化学増幅型レジスト材料はポジ型レジスト材料又はネガ型レジスト材料のいずれであってもよく、後述するベース成分及び現像液等を選択することにより適宜選択される。露光により、パターン露光部が溶け出しパターン未露光部(遮光部)が残るレジスト材料のことをポジ型レジスト材料といい、反対に未露光部が溶け出し、露光部(遮光部)が残るレジスト材料のことをネガ型レジスト材料という。
本実施形態において、上記(1)ベース成分は有機化合物であってもよく、無機化合物であってもよい。この有機化合物は高分子化合物であってもよく、低分子化合物であってもよい。また、上記高分子化合物は、酸の作用により現像液への溶解性が変化する重合体であってもよい。このような重合体はレジスト材料のベース成分として広く用いられている。さらに、(1)ベース成分は、パターン露光における第一の放射線を過度に吸収せず、十分垂直性が高い形状のレジストパターンの形成を実現できるものであることが望ましい。また、(1)ベース成分では、一括露光における第二の放射線の吸収が低く、一括露光時に未露光部で不要な増感反応の誘発が起こりにくいものであることが望ましい。また、(1)ベース成分は、後述する(d)酸−感放射線性増感体発生基、(e)感放射線性増感体前駆体基及び(f)感放射線性酸発生基を有する(1’)ベース成分であってもよい。
上記成分は、露光(放射線照射)により感放射線性増感体と酸を発生する成分である。上記成分は、(a)感放射線性酸−増感体発生剤、(b)感放射線性増感体発生剤、及び(c)感放射線性酸発生剤の3つの成分のうち、(a)成分、(a)〜(c)成分中の任意の2つの成分、又は(a)〜(c)成分の全てを含有する。すなわち、レジスト材料中で、上記(2)成分は上記(1)ベース成分とブレンドされている。
(a)感放射線性酸−増感体発生剤は、第一の放射線の照射によって、酸と、第二の放射線を吸収する感放射線性増感体とを発生し、かつ上記パターン露光工程で第一の放射線が照射されない未露光部では、第二の放射線の照射により上記酸及び感放射線性増感体が実質的に発生しない。(a)感放射線性酸−増感体発生剤は、上記性質を有するので、一括露光工程における第二の放射線の照射による上記酸及び感放射線性増感体の発生を抑制することができる。
(b)感放射線性増感体発生剤は、第一の放射線の照射によって、第二の放射線を吸収する感放射線性増感体を発生し、かつ上記パターン露光工程で第一の放射線が照射されない未露光部では、第二の放射線の照射により上記感放射線性増感体が実質的に発生しない成分であり、上記(a)感放射線性酸−増感体発生剤とは異なるものである。本実施形態に係るパターン形成方法では、パターン露光工程で、(b)感放射線性増感体発生剤の化学構造が直接的又は間接的な反応により変換し、一括露光工程で酸発生を補助する感放射線性増感体を生成する。吸収される非電離放射線の波長のピークがパターン露光工程前後でシフトすることにより、感放射線性増感体が発生した露光部と未露光部との間で、一括露光工程における第二の放射線の吸収のコントラストが得られやすくなる。さらに、上記吸収波長のピークシフトが大きい場合、一括露光工程における第二の放射線の吸収のコントラストがより大きくなる。
(c)感放射線性酸発生剤は、第一の放射線の照射によって、酸を発生し、かつ上記パターン露光工程で第一の放射線が照射されない未露光部では、第二の放射線の照射により上記酸が実質的に発生しない成分であり、上記(a)感放射線性酸−増感体発生剤とは異なるものである。(c)感放射線性酸発生剤は上記性質を有するので、一括露光時に放射線増感反応によりレジスト材料膜のパターン露光部だけで酸を発生させることができる。
(1’)ベース成分は、酸の作用により現像液に可溶又は不溶となる成分である。すなわち、一括露光工程後のベーク工程(図1参照)中の酸触媒反応により、現像工程においてパターン露光部が現像液に可溶又は不溶となるものである。この(1’)ベース成分は有機化合物であってもよく、無機化合物であってもよい。また、有機化合物は高分子化合物であってもよく、低分子化合物であってもよい。さらに、上記高分子化合物は重合体であってもよい。(1’)ベース成分における有機化合物及び無機化合物としては、上記(1)ベース成分におけるものと同様の化合物が挙げられる。
(d)酸−感放射線性増感体発生基は、第一の放射線の照射によって、酸と、第二の放射線を吸収する感放射線性増感体とを発生し、かつ上記パターン露光工程で第一の放射線が照射されない未露光部では、第二の放射線の照射により上記酸及び感放射線性増感体が実質的に発生しない基である。上記(d)酸−感放射線性増感体発生基は、上記性質を有するので、一括露光工程における第二の放射線の照射による上記酸及び上記感放射線性増感体の発生を抑制することができる。
(e)感放射線性増感体前駆体基は、第一の放射線の照射によって、第二の放射線を吸収する感放射線性増感体の機能を有する基となるものであり、かつ上記パターン露光工程で第一の放射線が照射されない未露光部では、第二の放射線の照射により上記感放射線性増感体が実質的に発生しない基である。また、(e)感放射線性増感体前駆体基は上記(d)で示される基とは異なるものである。本実施形態のパターン形成方法ではパターン露光工程において(e)感放射線性増感体前駆体基の構造が直接的或いは間接的な反応で変換し、一括露光工程で酸発生を補助する感放射線性増感体の機能を有する基となる。特に(e)感放射線性増感体前駆体基が高分子化合物に結合している場合、上記感放射線性増感体の機能を有する基は高分子化合物に固定されているため、パターン露光部からの拡散が抑制され、一括露光を行った後のパターン露光部と未露光部との間の酸の潜像のコントラストがより大きくなるという効果が得られる。
(f)感放射線性酸発生基は、第一の放射線の照射によって、酸を発生し、かつ上記パターン露光工程で第一の放射線が照射されない未露光部では、第二の放射線の照射により上記酸が実質的に発生しない基であり、上記(d)で示される基とは異なるものである。
上記レジスト材料は、上述の(1)ベース成分及び(2)成分の他に、(3)第一の捕捉剤、(4)第二の捕捉剤、(5)架橋剤、(6)添加剤、(7)溶剤等を適宜含んでもよい。
第一の捕捉剤は酸とカチオンを捕捉するものであり、クエンチャーとして機能するものである。レジスト材料が上記第一の捕捉剤を含むことにより、レジスト材料中で発生した酸を中和して、パターン露光部とパターン未露光部との間における酸の潜像の化学コントラストを上げることができる。上記(a)感放射線性酸−増感体発生剤がケタール化合物基若しくはアセタール化合物基を有する、又は上記(b)感放射線性増感体発生剤がケタール化合物若しくはアセタール化合物を含む場合、常温での酸触媒反応で感放射線性増感体が生成する。レジスト材料が上記第一の捕捉剤を含むことにより、この第一の捕捉剤が感放射線性増感体発生反応の触媒として働く酸を捕捉するため、アセタール化合物等から生じる感放射線性増感体の生成量のコントラストも向上できる。また、パターン露光工程において発生するカチオン中間体を経て放射線増感する反応機構により感放射線性増感体が発生する場合には、上記第一の捕捉剤が上記カチオン中間体を捕捉することで、一括露光時により選択的にパターン露光部だけで酸を増殖でき、その結果酸の潜像の化学コントラストをより改善するという効果も得られる。第一の捕捉剤は、放射線反応性を有する捕捉剤と放射線反応性を有しない捕捉剤とに分けることができる。
第二の捕捉剤は遊離ラジカルを捕捉するものであり、遊離ラジカルスカベンジャーとして機能するものである。レジスト材料が上記第二の捕捉剤を含むことにより、レジスト材料中のラジカルによる反応を経由した感放射線性増感体の発生がパターン露光量の少ないところでより小さく抑えられ、感放射線性増感体の潜像のコントラストをさらに上げるという効果が得られる。その結果、一括露光を行った後のパターン露光部と未露光部との間の酸の潜像のコントラストがより大きくなるという効果が得られる。
架橋剤は、一括露光後のベーク工程中において、酸触媒反応によりベース成分間で架橋反応を引き起こし、ベース成分の分子量を増加させ、現像液に対して不溶化するためのものであり、上記(1)ベース成分とは異なるものである。レジスト材料が架橋剤を含むことにより、架橋と同時に極性部位が非極性化し、現像液に対して不溶化するため、ネガ型レジスト材料を提供することができる。
添加剤としては、例えば界面活性剤、酸化防止剤、溶解抑制剤、可塑剤、安定剤、着色剤、ハレーション防止剤、染料等が挙げられる。界面活性剤、酸化防止剤、溶解抑制剤、可塑剤、安定剤、着色剤、ハレーション防止剤及び染料には公知の材料を選択することができる。界面活性剤としては、例えばイオン性や非イオン性のフッ素系界面活性剤、シリコン系界面活性剤等を用いることができる。酸化防止剤としては、例えばフェノール系酸化防止剤、有機酸誘導体からなる酸化防止剤、硫黄含有酸化防止剤、リン系酸化防止剤、アミン系酸化防止剤、アミン−アルデヒド縮合物からなる酸化防止剤、アミン−ケトン縮合物からなる酸化防止剤等が挙げられる。
溶剤は、レジスト材料の組成物を溶解し、スピンコーティング法等での塗布機によるレジスト材料膜の形成を容易とするためのものである。なお、上記(b)感放射線性増感体発生剤等に包含される化合物は溶剤からは除くものとする。溶剤としては、例えばシクロへキサノン、メチル−2−アミルケトン等のケトン類;3−メトキシブタノール、3−メチル−3−メトキシブタノール、1−メトキシ−2−プロパノール、1−エトキシ−2−プロパノール等のアルコール類;プロピ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メチルエーテル、プロピ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エチルエーテル、プロピ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メチルエーテル等のエーテル類;並びにプロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート、乳酸エチル、ピルビン酸エチル、酢酸ブチル、3−メトキシプロピオン酸メチル、3−エトキシプロピオン酸エチル、酢酸tert−ブチル、プロピオン酸tert−ブチル、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノtert−ブチルエーテルアセテート等のエステル類などが挙げられる。
レジスト材料は、上記成分を含む感放射線性樹脂組成物である。レジスト材料を調製するに際しては、レジスト材料の用途、使用条件等において各成分の配合比率を適宜設定すればよい。
パターン露光工程S3では、上記膜形成工程S2で形成されたレジスト材料膜上に、所定のパターンの遮光マスクを配置する。その後、上記レジスト材料膜に、投影レンズ、電子光学系ミラー、又は反射ミラーを有する露光装置(放射線照射モジュール)から、上記マスクを介して第一の放射線が照射(パターン露光)される。
一括露光工程S4では、上記パターン露光工程S3後のレジスト材料膜全面(パターン露光部とパターン未露光部とを併せた全面)に、上記パターン露光における非電離放射線より長く、かつ200nmを超える波長を有する非電離放射線を照射する。
ベーク工程S5では、上記一括露光工程S4後のレジスト材料膜が加熱(以下、「ポストフラッドエクスポージャベーク(PFEB)」又は「ポストエスポージャーベーク(PEB)」ともいう。)される。なお、本実施形態のパターン形成方法が、上記パターン露光工程S3後上記一括露光工程S4前にベーク工程S3aを備える場合、上記ベーク工程S3aを1stPEB工程、上記ベーク工程S5を2ndPEB工程ということがある(図2参照)。加熱条件としては、例えば大気中、窒素やアルゴン等の不活性ガス雰囲気下で、50℃以上200℃以下、10秒以上300秒以下とすることができる。加熱条件を上記範囲とすることにより、酸の拡散を制御でき、また、半導体ウエハの処理速度を確保できる傾向がある。ベーク工程S5では、上記パターン露光工程S3及び一括露光工程S4で発生した酸により、(1)ベース成分及び(1’)ベース成分の脱保護反応等の極性変化反応及び架橋反応等が起こる。また、レジスト材料膜内における放射線の定在波の影響によりレジスト側壁が波打つことがあるが、ベーク工程S5では反応物の拡散により上記波打ちを低減できる。
現像工程S6では、上記ベーク工程S5後のレジスト材料膜を現像液に接触させる。上記ベーク工程S5におけるレジスト材料膜内の反応により、パターン露光部で選択的に現像液への溶解性が変わることを利用して現像し、レジストパターンが形成される。現像液はポジ型現像液とネガ型現像液とに分けることができる。
工程S7では、上記現像工程S6後のレジストパターンをマスクとして下地である基板がエッチング又はイオン注入されることによってパターンが形成される。エッチングはプラズマ励起等の雰囲気下でのドライエッチングであってもよく、薬液中に浸漬するウェットエッチングであってもよい。エッチングにより基板にパターンが形成された後、レジストパターンが除去される。
以下、本実施形態に係るリソグラフィプロセスにおいて起こる反応のメカニズムについて説明する。
パターン露光工程S3では、レジスト材料膜に第一の放射線が照射(パターン露光)される。上記第一の放射線が電離放射線である場合に想定される反応例を第二の反応体系を中心に以下に示す。ただし、想定される反応は以下に記載する反応に限定されない。
一括露光工程S4では、レジスト材料膜に第二の放射線が照射(一括露光)される。感放射線性増感体発生剤は、パターン露光時にはパターン露光のエネルギーの吸収が十分小さい必要があるが、パターン露光のエネルギーで化学構造変換が起こり感放射線性増感体を発生する。上記化学構造変換により紫外線領域で光吸収のスペクトルがシフトし、感放射線性増感体は感放射線性増感体発生剤よりも長い波長側で光を吸収するようになる。この化学構造変換による光吸収シフトが大きくなるように感放射線性増感体発生剤の材料を選択することが望ましい。このような化学構造変換としては、例えばアルコール化合物又はケタール化合物がケトン化合物に変わる化学変化が挙げられる。以下に一括露光工程S4における反応を示す。以下では(b)成分及び(c)成分を例に挙げて説明するが、(a)成分及び(d)〜(f)で示される基においても同様の反応が起こる。つまり、第一〜第三の反応体系に共通して起こる放射線増感による酸の発生量の増幅について、まず、第二及び第三の反応体系の例を中心に示す。これらの反応は、一括露光による感放射線性増感体の励起と、励起状態の感放射線性増感体が引き起こす感放射線性酸発生剤の分解による酸の発生とからなる。励起状態の感放射線性増感体が感放射線性酸発生剤を分解する反応機構としては主に電子移動によるものと励起移動によるものとに大きく分けられる。これらの増感反応は連鎖的に起こるため、一括露光による酸の発生量を大幅に増幅でき、レジストの感度が大きく向上する。
本実施形態に係る半導体デバイスは、上記方法によって形成されたパターンを用いて製造される。図3(a)〜(c)は本実施形態の半導体デバイスの製造工程の一例を示した断面図である。
本実施形態に係るリソグラフィ用マスクは、上記方法によって形成されたレジストパターンを用い、基板を加工して製造される。この製造方法としては、例えばガラス基板表面又はガラス基板表面に形成されたハードマスクを、レジストパターンを用いてエッチングする方法が挙げられる。ここで、リソグラフィ用マスクには、紫外線又は電子線を用いた透過型マスク、EUV光を用いた反射型マスク等が含まれる。リソグラフィ用マスクが透過型マスクの場合、遮光部又は位相シフト部をレジストパターンでマスクして、エッチングで加工することで製造できる。また、リソグラフィ用マスクが反射型のマスクの場合、レジストパターンをマスクにして、エッチングで吸光体を加工することで製造できる。。
本実施形態に係るナノインプリント用テンプレートも、上記方法によって形成されたレジストパターンを用いて製造できる。この製造方法としては、例えばガラス基板表面又はガラス基板表面形成されたハードマスク表面にレジストパターンを形成し、エッチングで加工する方法等が挙げられる。
重合体のMw及びMnは、GPCカラム(G2000HXL 2本、G3000HXL 1本、G4000HXL 1本、以上東ソー社)を用い、流量1.0mL/分、溶出溶媒テトラヒドロフラン、試料濃度1.0質量%、試料注入量100μL、カラム温度40℃の分析条件で、検出器として示差屈折計を使用し、単分散ポリスチレンを標準とするゲルパーミエーションクロマトグラフィー(GPC)により測定した。
重合体の構造単位の含有割合を求めるための13C−NMR分析は、核磁気共鳴装置(日本電子社の「JNM−ECX400」)を使用し、測定溶媒としてCDCl3を用い、テトラメチルシラン(TMS)を内部標準として行った。
(1)ベース成分の合成に用いた単量体を下記に示す。
上記化合物(M−1)55g(50モル%)、上記化合物(M−2)45g(50モル%)及びアゾビスイソブチロニトリル(AIBN)3gを、メチルエチルケトン300gに溶解した後、窒素雰囲気下、反応温度を78℃に保持して、6時間重合させた。重合後、反応溶液を2,000gのメタノール中に滴下して、重合体を凝固させた。次いで、この重合体を300gのメタノールで2回洗浄し、得られた白色粉末をろ過して、減圧下50℃で一晩乾燥し、(1)ベース成分としての重合体(S−1)を得た。重合体(S−1)は、Mwが7,000、Mw/Mnが2.10であった。また、13C−NMR分析の結果、化合物(M−1)及び化合物(M−2)に由来する各構造単位の含有割合は、それぞれ52モル%及び48モル%であった。
上記化合物(M−3)55g(42モル%)、上記化合物(M−1)45g(58モル%)、AIBN3g及びt−ドデシルメルカプタン1gを、プロピレングリコールモノメチルエーテル150gに溶解した後、窒素雰囲気下、反応温度を70℃に保持して、16時間重合させた。重合後、反応溶液を1,000gのn−ヘキサン中に滴下して、重合体を凝固精製した。次いで、この重合体に、再度プロピレングリコールモノメチルエーテル150gを加えた後、さらに、メタノール150g、トリエチルアミン37g及び水7gを加えて、沸点にて還流させながら、8時間加水分解反応を行って、(M−3)に由来する構造単位の脱アセチル化を行った。反応後、溶媒及びトリエチルアミンを減圧留去し、得られた重合体をアセトン150gに溶解した後、2,000gの水中に滴下して凝固させ、生成した白色粉末をろ過して、減圧下50℃で一晩乾燥し、(1)ベース成分としての重合体(S−2)を得た。重合体(S−2)は、Mwが6,000、Mw/Mnが1.90であった。また、13C−NMR分析の結果、p−ヒドロキシスチレンに由来する構造単位及び化合物(M−1)に由来する構造単位の含有割合は、それぞれ50モル%及び50モル%であった。
[(b)感放射線性増感体発生剤]
(b)感放射線性増感体発生剤としては、以下の化合物を使用した。
B−1:下記式(B−1)で表される化合物
B−2:下記式(B−2)で表される化合物
表3に、(b)成分及びこの(b)成分に由来する増感剤を併せて示す。また、これらの(b)成分及び(b)成分に由来する増感剤を、それぞれ0.0001質量%のシクロヘキサン溶液となるように調製した。この調製溶液について、シクロヘキサンを参照溶媒として分光光度計(日本分光社の「V−670」)を用いて吸光度を測定した。
C−1:下記式(C−1)で表される化合物
化学増幅型レジスト材料の調製に用いた(1)ベース成分及び(2)成分以外の各成分を以下に示す。
E−1:下記式(E−1)で表される化合物
E−2:下記式(E−2)で表される化合物
G−1:酢酸プロピレングリコールモノメチルエーテル
G−2:乳酸エチル
(1)ベース成分としての(S−1)100質量部、(b)感放射線性増感体発生剤としての(B−1)5質量部、(c)感放射線性酸発生剤としての(C−1)20質量部、第一の捕捉剤としての(E−1)2.5質量部、並びに溶剤としての(G−1)4,300質量部及び(G−2)1,900質量部を混合し、得られた混合液を孔径0.20μmのメンブランフィルターでろ過し、化学増幅型レジスト材料(R−1)を調製した。
表5に示す種類及び配合量の各成分を用いた以外は調製例1と同様に操作して各化学増幅型レジスト材料を調製した。なお「−」はその成分を添加しなかったことを示す。
[調製例5]
コンデンサー、温度計、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質量部、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質量部及びパラホルムアルデヒド50質量部を仕込み、蓚酸2質量部を添加した。その後、この混合物を脱水しながら120℃に昇温し5時間反応させることで、下記式(K−1)で表される構造単位を有する樹脂(T−1)を得た。この樹脂(T−1)の重量平均分子量(Mw)は2,000であった。
温度計を備えたセパラブルフラスコに、アセナフチレン100質量部、トルエン78質量部、ジオキサン52質量部部及びAIBN3質量部を仕込み、窒素雰囲気下、70℃で5時間攪拌した。次いで、p−トルエンスルホン酸1水和物5.2質量部及びパラホルムアルデヒド40質量部を添加し、120℃に昇温して6時間攪拌した。得られた反応溶液を多量のイソプロパノール中に投入し、沈殿した樹脂をろ過により採取した。この沈殿物を40℃で減圧乾燥することで、下記式(K−2)で表される構造単位を有する樹脂(T−2)を得た。得られた樹脂(T−2)の重量平均分子量(Mw)は20,000であった。
[調製例7]
シュウ酸1.27gを水12.72gに加熱溶解させシュウ酸水溶液を調製した。その後、テトラメトキシシラン14.05g、メチルトリメトキシシラン5.03g、フェニルトリメトキシシラン10.99g、及びプロピレングリコールモノエチルエーテル58.04gを入れたフラスコに、冷却管と、上記調製したシュウ酸水溶液を入れた滴下ロートとを配設した。次いで、上記フラスコをオイルバスにて60℃に加熱し、上記シュウ酸水溶液を10分かけて滴下した後、60℃で4時間反応させた。反応終了後、反応溶液の入ったフラスコを放冷してからエバポレーターに配設し、反応により生成したメタノールを除去することでポリシロキサン(A−1)含有溶液75.0gを得た。このポリシロキサン(A−1)含有溶液の固形分濃度は、18.0質量%であった。また、このポリシロキサン(A−1)のMwは2,100であった。
(反射防止膜及びシリコン含有膜の形成)
東京エレクトロン社の「クリーントラックACT−8」内で、シリコンウエハ上に上記反射防止膜形成用組成物(U−1)をスピンコートし、180℃で60秒焼成した後、350℃で120秒焼成することで平均厚み160nmの反射防止膜を形成した。次いで、この反射防止膜上に上記シリコン含有膜形成用組成物(P−1)をスピンコートし、215℃で60秒焼成することで平均厚み33nmのシリコン含有膜を形成した。
その後、上記シリコン含有膜上に化学増幅型レジスト材料(R−1)をスピンコートし、110℃、60秒の条件でPBを行うことで平均厚み50nmのレジスト材料膜を形成した。
続いて、簡易型の電子線描画装置(日立製作所社の「HL800D」、出力50KeV、電流密度5.0アンペア/cm2)を用いてレジスト材料膜に電子線を照射し、パターニングを行った。このパターニングとしては、マスクを用い、線幅150nmのライン部と、隣り合うライン部によって形成される間隔が150nmのスペース部とからなるライン・アンド・スペースパターン(1L1S)とした。電子線の照射後、続いて以下(a)又は(b)の操作を行った。
電子線の照射後、上記クリーントラックACT−8内で、110℃、60秒の条件でPEBを行い、次いで上記クリーントラックACT−8内で、2.38質量%テトラメチルアンモニウムヒドロキシド(TMAH)水溶液を用い、23℃で1分間、パドル法により現像した。現像後、純水での水洗及び乾燥によりポジ型レジストパターンを形成した。
電子線の照射後、ブラックライト(東芝社、波長320nm)を用い、レジスト材料膜の全面を10分間一括露光した。次いで、上記クリーントラックACT−8内で、110℃、60秒の条件でPEBを行った。その後、上記操作(a)と同様にして現像、水洗及び乾燥を行いポジ型レジストパターンを形成した。
表7に記載した反射防止膜形成用組成物及び化学増幅型レジスト材料を用いた以外は、上記実施例1と同様に操作して各レジストパターンを形成した。また、これらの実施例及び比較例について、シリコン含有膜の有無を表7に併せて示す。
[反射防止膜及びシリコン含有膜の消衰係数測定]
上記基板に、表6に示す上記反射防止膜形成用組成物を用いて平均厚み160nmの反射防止膜を形成した。また、別の上記基板に、表6に示すシリコン含有膜形成用組成物を用いて平均厚み33nmのシリコン含有膜を形成した。これらの反射防止膜及びシリコン含有膜の193nm及び320nmにおける消衰係数を表6に示す。この消衰係数は、シリコンウエハ上に塗布した各材料の膜について高速分光エリプソメーター(ジェー・エー・ウーラム社の「M−2000」)を用いて測定した値である。
また、上記実施例及び比較例のポジ型レジストパターンについて、下記に示す手順により感度の評価を行った。線幅150nmのライン部と、隣り合うライン部によって形成される間隔が150nmのスペース部とからなるライン・アンド・スペースパターン(1L1S)を1対1の線幅に形成する露光量を最適露光量とし、この最適露光量を感度の指標とした。最適露光量が25μC/cm2未満の場合は「AA(極めて良好)」と、25μC/cm2以上35μC/cm2以下の場合は「A(良好)」と、35μC/cm2超の場合は「B(不良)」と、パターン倒れが生じ150nmの1L1Sパターンが得られなかった場合は「C(パターン形成不可)」と判断した。最適露光量の測定値及び感度の評価結果を表7に示す。
さらに、上記実施例及び比較例のポジ型レジストパターンについて、下記に示す手順によりナノエッジラフネスについての評価を行った。上記ライン・アンド・スペースパターン(1L1S)のラインパターンを、高分解能FEB測長装置(日立製作所社の「S−9220」)を用いて観察した。ラインパターンの任意の20点において形状を観察し、それぞれの点について図8及び図9に示すように、基材(シリコンウエハ)11上に形成したパターンにおけるライン部12の横側面12aに沿って生じた凹凸が最も著しい箇所における線幅と、設計線幅150nmとの差「ΔCD」を測定した。20点のΔCDの平均値をナノエッジラフネスの指標とした。ΔCDの平均値(nm)が15.0nm以下の場合は「AA(極めて良好)」と、15.0nm超16.5nm以下の場合は「A(良好)」と、16.5nm超の場合は「B(不良)」と判断した。なお、図8及び図9で示す凹凸は、実際より誇張して記載している。ΔCDの平均値及びナノエッジラフネスの評価結果を表7に示す。ここで、比較例1及び比較例3ではパターン倒れが生じたためナノエッジラフネスは測定できなかった。
(ArFレーザーの照射)
表8に記載した下層膜形成用組成物及び化学増幅型レジスト材料を用いた以外は、上記実施例1と同様に操作して平均厚み70nmのレジスト材料膜を形成した。また、これらの実施例及び比較例について、シリコン含有膜の有無を表8に併せて示す。
電子線の照射後、上記クリーントラックACT−8内で、110℃、60秒の条件でPEBを行い、次いで上記クリーントラックACT−8内で、2.38質量%テトラメチルアンモニウムヒドロキシド(TMAH)水溶液を用い、23℃で1分間、パドル法により現像した。現像後、純水での水洗及び乾燥によりポジ型レジストパターンを形成した。
電子線の照射後、ブラックライト(東芝社、波長320nm)を用い、レジスト材料膜の全面を10分間一括露光した。次いで、上記クリーントラックACT−8内で、110℃、60秒の条件でPEBを行った。その後、上記操作(a)と同様にして現像、水洗及び乾燥を行いポジ型レジストパターンを形成した。
上記実施例及び比較例のポジ型レジストパターンについて、下記に示す手順により感度及びナノエッジラフネスについての評価を行った。
線幅45nmのライン部と、隣り合うライン部によって形成される間隔が45nmのスペース部とからなるライン・アンド・スペースパターン(1L1S)を1対1の線幅に形成する露光量を最適露光量とし、この最適露光量を感度の指標とした。最適露光量が25μC/cm2未満の場合は「AA(極めて良好)」と、25μC/cm2以上35μC/cm2以下の場合は「A(良好)」と、35μC/cm2超の場合は「B(不良)」と、パターン倒れが生じ45nmの1L1Sパターンが得られなかった場合は「C(パターン形成不可)」と判断した。最適露光量の測定値及び感度の評価結果を表8に示す。
上記ライン・アンド・スペースパターン(1L1S)のラインパターンを、高分解能FEB測長装置(日立製作所社の「S−9220」)を用いて観察した。ラインパターンの任意の20点において形状を観察し、それぞれの点について図8及び図9に示すように、基材(シリコンウエハ)11上に形成したパターンにおけるライン部12の横側面12aに沿って生じた凹凸が最も著しい箇所における線幅と、設計線幅45nmとの差「ΔCD」を測定した。20点のΔCDの平均値をナノエッジラフネスの指標とした。ΔCDの平均値(nm)が3.0nm以下の場合は「AA(極めて良好)」と、3.0nm超5.0nm以下の場合は「A(良好)」と、5.0nm超の場合は「B(不良)」と判断した。なお、図8及び図9で示す凹凸は、実際より誇張して記載している。ΔCDの平均値及びナノエッジラフネスの評価結果を表8に示す。ここで、比較例5ではパターン倒れが生じたためナノエッジラフネスは測定できなかった。
2、12 レジストパターン
3 被エッチング膜
10 パターン基板
11 基材
12a レジストパターンの横側面
Claims (5)
- 基板上に形成された反射防止膜上に化学増幅型レジスト材料を使用してレジスト材料膜を形成する膜形成工程と、
上記レジスト材料膜に、電離放射線又は400nm以下の波長を有する非電離放射線を照射するパターン露光工程と、
上記パターン露光工程後の上記レジスト材料膜に、上記パターン露光工程における非電離放射線より長く、かつ200nmを超える波長を有する非電離放射線を照射する一括露光工程と、
上記一括露光工程後の上記レジスト材料膜を加熱するベーク工程と、
上記ベーク工程後の上記レジスト材料膜を現像液に接触させる現像工程と
を備え、
上記一括露光工程で照射する上記非電離放射線における上記反射防止膜の消衰係数が0.1以上であり、
上記化学増幅型レジスト材料が、
(1)酸の作用により上記現像液に可溶又は不溶となるベース成分と、
(2)露光により感放射線性増感体及び酸を発生する成分と
を含み、
上記(2)成分が、下記(a)成分、下記(a)〜(c)成分中の任意の2つの成分、又は下記(a)〜(c)成分の全てを含有し、
上記膜形成工程前に、上記反射防止膜と上記レジスト材料膜との間に、上記一括露光工程の非電離放射線における消衰係数が0.1以下である透明膜を形成するパターン形成方法。
(a)上記パターン露光工程における電離放射線又は非電離放射線の照射によって、酸と、一括露光工程における非電離放射線を吸収する感放射線性増感体とを発生し、かつ上記一括露光工程の際、上記パターン露光工程の未露光部において上記酸及び感放射線性増感体が実質的に発生しない感放射線性酸−増感体発生剤
(b)上記パターン露光工程における電離放射線又は非電離放射線の照射によって、一括露光工程における非電離放射線を吸収する感放射線性増感体を発生し、かつ上記一括露光工程の際、上記パターン露光工程の未露光部において上記感放射線性増感体が実質的に発生しない感放射線性増感体発生剤
(c)上記パターン露光工程における電離放射線又は非電離放射線の照射によって、酸を発生し、かつ上記一括露光工程の際、上記パターン露光工程の未露光部において上記酸が実質的に発生しない感放射線性酸発生剤 - 上記膜形成工程前に、上記反射防止膜と上記レジスト材料膜との間にケイ素含有膜を形成する請求項1に記載のパターン形成方法。
- 基板上に形成された反射防止膜上に化学増幅型レジスト材料を使用してレジスト材料膜を形成する膜形成工程と、
上記レジスト材料膜に、電離放射線又は400nm以下の波長を有する非電離放射線を照射するパターン露光工程と、
上記パターン露光工程後の上記レジスト材料膜に、上記パターン露光工程における非電離放射線より長く、かつ200nmを超える波長を有する非電離放射線を照射する一括露光工程と、
上記一括露光工程後の上記レジスト材料膜を加熱するベーク工程と、
上記ベーク工程後の上記レジスト材料膜を現像液に接触させる現像工程と
を備え、
上記一括露光工程で照射する上記非電離放射線における上記反射防止膜の消衰係数が0.1以上であり、
上記化学増幅型レジスト材料が、
(1)酸の作用により上記現像液に可溶又は不溶となるベース成分と、
(2)露光により感放射線性増感体及び酸を発生する成分と
を含み、
上記(2)成分が、下記(a)成分、下記(a)〜(c)成分中の任意の2つの成分、又は下記(a)〜(c)成分の全てを含有し、
上記膜形成工程前に、上記反射防止膜と上記レジスト材料膜との間にケイ素含有膜を形成するパターン形成方法。
(a)上記パターン露光工程における電離放射線又は非電離放射線の照射によって、酸と、一括露光工程における非電離放射線を吸収する感放射線性増感体とを発生し、かつ上記一括露光工程の際、上記パターン露光工程の未露光部において上記酸及び感放射線性増感体が実質的に発生しない感放射線性酸−増感体発生剤
(b)上記パターン露光工程における電離放射線又は非電離放射線の照射によって、一括露光工程における非電離放射線を吸収する感放射線性増感体を発生し、かつ上記一括露光工程の際、上記パターン露光工程の未露光部において上記感放射線性増感体が実質的に発生しない感放射線性増感体発生剤
(c)上記パターン露光工程における電離放射線又は非電離放射線の照射によって、酸を発生し、かつ上記一括露光工程の際、上記パターン露光工程の未露光部において上記酸が実質的に発生しない感放射線性酸発生剤 - 上記反射防止膜が有機膜である請求項1、請求項2又は請求項3に記載のパターン形成方法。
- 上記パターン露光工程で照射する上記電離放射線又は非電離放射線における上記反射防止膜の消衰係数が0.3以上である請求項1から請求項4のいずれか1項に記載のパターン形成方法。
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