JP6524388B2 - 光増感化学増幅レジストで酸ショットノイズとして複製されるeuvショットノイズの軽減 - Google Patents
光増感化学増幅レジストで酸ショットノイズとして複製されるeuvショットノイズの軽減 Download PDFInfo
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Classifications
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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
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2022—Multi-step exposure, e.g. hybrid; backside exposure; blanket exposure, e.g. for image reversal; edge exposure, e.g. for edge bead removal; corrective exposure
-
- 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
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/40—Treatment after imagewise removal, e.g. baking
-
- 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
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70008—Production of exposure light, i.e. light sources
- G03F7/70033—Production of exposure light, i.e. light sources by plasma extreme ultraviolet [EUV] sources
-
- 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
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
Description
本出願は、2014年2月24日出願の“MITIGATION OF EUV SHOT NOISE REPLICATING INTO ACID SHOT NOISE IN PHOTO−SENSITIZED CHEMICALLY AMPLIFIED RESIST(PS−CAR)”という名称の同時係属米国仮特許出願第61/944,044号明細書(参照番号CT−121PROV)に依拠し、その利益および優先権を主張するものであり、その内容はすべて参照により本明細書に組み込まれる。
715 光の第1の波長で光増感化学増幅レジスト(PS−CAR)をパターン化露光するステップ
720 光増感剤分子(PS)を拡散させるステップ
725 光の第2の波長で光増感化学増幅レジスト(PS−CAR)をフラッド露光するステップ
730 基板を加熱するステップ(任意)
735 PS−CARを現像するステップ
740 下層をエッチング、インプラント、または改質するステップ
Claims (18)
- 基板を処理する方法であって、
前記基板を受け取るステップであって、前記基板が、
前記基板上の下層と、
前記下層上の感放射線性材料層と
を含み、前記感放射線性材料層が、
前記感放射線性材料層中の酸の生成を第1の酸濃度に制御し、かつ前記感放射線性材料層中の光増感剤分子の生成を制御する第1の光波長活性化閾値であって、300nm未満である前記第1の光波長活性化閾値と、
前記感放射線性材料層の前記光増感剤分子を励起することができ、それにより前記第1の酸濃度より大きい第2の酸濃度を含む酸をもたらす第2の光波長活性化閾値であって、300nm超である第2の光波長活性化閾値と、
前記光増感剤分子の熱活性化エネルギーよりも高い熱活性化エネルギーを有する、光酸発生剤(PAG)と、
を含む、ステップと、
前記感放射線性材料層内に光増感剤分子を生成するため、パターン化マスクを介して光の第1の波長を前記感放射線性材料層上に露光するステップであって、前記光の第1の波長が、前記第1の光波長活性化閾値以上であり、且つ、前記第2の光波長活性化閾値未満である、EUVスペクトルにおける波長を含む、ステップと、
前記感放射線性材料層におけるEUVショットノイズに起因する不均一性を低減するために、前記感放射線性材料層内で生成された前記光増感剤分子を拡散させるステップと、
光の第2の波長を前記感放射線性材料層にフラッド露光するステップであって、前記光の第2の波長が、前記第2の光波長活性化閾値以上である、ステップと、
を含む、方法。 - 光の第2の波長をフラッド露光する前記ステップに続き、前記基板を加熱するステップと、
前記感放射線性材料層を現像するステップと、
前記現像された感放射線性材料層をマスクとして用いて、前記下層をエッチング、インプラント、または改質するステップと、
をさらに含む、請求項1に記載の方法。 - 前記感放射線性材料層で生成された光増感剤分子を拡散させる前記ステップが、前記基板を加熱するステップを含む、請求項1に記載の方法。
- 前記基板を加熱するステップが、ホットプレート上で、対流熱源を用いて、または電磁放射線源からの電磁放射線への暴露により前記基板を加熱するステップを含む、請求項3に記載の方法。
- 前記電磁放射線が、可視線、UV線、赤外線、もしくはマイクロ波放射線、またはそれらの組合せを含む、請求項4に記載の方法。
- 前記電磁放射線源が、広帯域フラッシュランプ、発光ダイオード、レーザー、紫外(UV)フラッシュランプ、またはマイクロ波源である、請求項4に記載の方法。
- 前記基板が120秒以下にわたり30℃〜130℃の温度に加熱される、請求項3に記載の方法。
- パターン化マスクを介して光の第1の波長を露光する前記ステップで生成された酸の拡散を最小限に抑えつつ、EUVショットノイズに関連するライン幅ラフネス(LWR)を改善するために、前記感放射線性材料層で生成された光増感剤分子を拡散させる前記ステップの1つ以上のパラメーターが最適化される、請求項1に記載の方法。
- 前記感放射線性材料層で生成された光増感剤分子を拡散させる前記ステップが、液体溶媒または溶媒蒸気の少なくとも一方に前記感放射線性材料層を暴露するステップを含む、請求項1に記載の方法。
- 前記溶媒蒸気が、N−メチルピロリドン(NMP)、ジメチルスルホキシド(DMSO)、およびジプロピレングリコールジメチルエーテル、イソプロパノール、またはそれらの2種以上の混合物からなる群から選択される溶媒を含む、請求項9に記載の方法。
- 前記液体溶媒が、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、ガンマブチロラクトン、メチルアミルケトン、エチルラクテート、n−ブチルアセテート、メチルイソブチルケトン(MIBK)、アニソール、2−ヘプタノン、および水酸化テトラメチルアンモニウム(TMAH)水性溶液、水、メタノール、4−メチル−2−ペンタノール、イソプロパノール、エタノール、プロパノール、ブタノール、またはそれらの2種以上の混合物からなる群から選択される溶媒を含む、請求項9に記載の方法。
- 前記感放射線性材料層で生成された光増感剤分子を拡散させる前記ステップが、前記感放射線性材料層の前記液体溶媒および前記溶媒蒸気への複数回の交互暴露を含む、請求項9に記載の方法。
- 溶媒蒸気への前記感放射線性材料層の前記暴露中、前記基板が20℃〜100℃の温度に維持される、請求項9に記載の方法。
- 溶媒蒸気への前記感放射線性材料層の前記暴露中、前記溶媒蒸気の分圧が5mTorr〜100mTorrに維持される、請求項9に記載の方法。
- 溶媒蒸気への前記感放射線性材料層の前記暴露中、圧力が、前記溶媒蒸気への前記暴露時に選択された温度のための溶媒飽和蒸気圧に維持される、請求項9に記載の方法。
- 前記感放射線性材料層で生成された光増感剤分子を拡散させる前記ステップが、前記感放射線性材料層を真空環境に暴露するステップを含む、請求項1に記載の方法。
- 前記真空環境の圧力が0.1mTorr〜500mTorrに維持される、請求項16に記載の方法。
- 前記真空環境の圧力が5mTorr〜100mTorrに維持される、請求項16に記載の方法。
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