JP6466650B2 - レジスト組成物の製造方法 - Google Patents
レジスト組成物の製造方法 Download PDFInfo
- Publication number
- JP6466650B2 JP6466650B2 JP2014076653A JP2014076653A JP6466650B2 JP 6466650 B2 JP6466650 B2 JP 6466650B2 JP 2014076653 A JP2014076653 A JP 2014076653A JP 2014076653 A JP2014076653 A JP 2014076653A JP 6466650 B2 JP6466650 B2 JP 6466650B2
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- Prior art keywords
- resist composition
- producing
- cleaning liquid
- resist
- silicon
- Prior art date
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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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
- G03F7/004—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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- G—PHYSICS
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- 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
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- G03F7/004—Photosensitive materials
- G03F7/075—Silicon-containing compounds
- G03F7/0752—Silicon-containing compounds in non photosensitive layers or as additives, e.g. for dry lithography
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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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- G—PHYSICS
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- 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
- G03F7/004—Photosensitive materials
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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
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
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- 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
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- 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
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- 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
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- G03F7/32—Liquid compositions therefor, e.g. developers
- G03F7/325—Non-aqueous compositions
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
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- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
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- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31127—Etching organic layers
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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Description
半導体装置製造工程で使用されるレジスト組成物の製造方法であって、
前記レジスト組成物の製造装置を洗浄液で洗浄し、該洗浄液を前記製造装置から取り出して分析し、該洗浄液中に含まれる金属成分の濃度が5ppb以下となるまで洗浄した後に、前記製造装置で前記レジスト組成物を製造するレジスト組成物の製造方法を提供する。
前記レジスト組成物の製造方法により製造されたレジスト組成物を用いて被加工体にパターンを形成する方法であって、
被加工体上に前記製造方法で製造した有機レジスト組成物を用いて有機下層膜を形成し、該有機下層膜上に前記製造方法で製造したケイ素含有レジスト組成物を用いてケイ素含有レジスト下層膜を形成し、該ケイ素含有レジスト下層膜上にレジスト上層膜を形成し、該レジスト上層膜にパターンを形成し、該パターンが形成されたレジスト上層膜をマスクにして前記ケイ素含有レジスト下層膜にパターン転写し、該パターンが転写されたケイ素含有レジスト下層膜をマスクにして前記有機下層膜にパターンを転写し、さらに該パターンが転写された有機下層膜をマスクにして前記被加工体にパターンを転写するパターン形成方法を提供する。
半導体装置製造工程で使用されるレジスト組成物の製造方法であって、
前記レジスト組成物の製造装置を洗浄液で洗浄し、該洗浄液を前記製造装置から取り出して分析し、該洗浄液中に含まれる金属成分の濃度が5ppb以下となるまで洗浄した後に、前記製造装置で前記レジスト組成物を製造するレジスト組成物の製造方法である。
以下、図面を参照しながら、本発明を説明する。
まず、工程(a)において、図2に示されるような製造装置10で予めレジスト組成物の製造を行う。
製造装置10は、攪拌機2及び供給口6を備える調製タンク1と、調製タンク1からタンクバルブV1を備える配管を通じてつながる送液ポンプ3と、送液ポンプ3から送り出された洗浄液又はレジスト組成物をろ過するろ過機4と、ろ過機4でろ過されたレジスト組成物を製品容器5に供給する抜出バルブV2を備え、洗浄時に調製タンク1の供給口6から供給された洗浄液を循環させるための循環バルブV3及び洗浄液を通す配管を備えるものである。このうち、ろ過機4には、異物の除去を目的として製造用フィルターを設置してもよいし、洗浄で使用したフィルターとは異なるフィルターを製造用として使用するために、製造時に別のフィルターに交換してもよい。
図2に示される製造装置10から洗浄液を取り出す方法としては、抜出バルブV2の解放による洗浄液の抜き出しや、調製タンク1の供給口6からの洗浄液の採取による方法を例示できる。
この金属成分は、レジスト組成物の製造装置を洗浄した洗浄液中に含まれるものであり、製造装置の各機器に由来するものや、前回の製造にて装置内に流入した装置外の環境に由来するものを挙げることができる。具体的なものとしては、鉄、クロム、ニッケル、ナトリウム、マグネシウム、アルミニウム、カリウム、カルシウム、銅、亜鉛を挙げることができる。
この製造用のフィルターの孔径は、製品(レジスト組成物)に求められる清浄度に合わせて適宜選択できる。例えば、塗布欠陥を減らす必要があれば、孔径が20nm以下のものを用いても良く、さらに高い清浄度が求められている場合は孔径が10nm以下のものを用いることができる。
前述のレジスト組成物の製造方法により製造されたレジスト組成物を用いて被加工体にパターンを形成する方法であって、
被加工体上に前記製造方法で製造した有機レジスト組成物を用いて有機下層膜を形成し、該有機下層膜上に前記製造方法で製造したケイ素含有レジスト組成物を用いてケイ素含有レジスト下層膜を形成し、該ケイ素含有レジスト下層膜上にレジスト上層膜を形成し、該レジスト上層膜にパターンを形成し、該パターンが形成されたレジスト上層膜をマスクにして前記ケイ素含有レジスト下層膜にパターン転写し、該パターンが転写されたケイ素含有レジスト下層膜をマスクにして前記有機下層膜にパターンを転写し、さらに該パターンが転写された有機下層膜をマスクにして前記被加工体にパターンを転写するパターン形成方法を提供する。
また、被加工体(半導体基板を含む)を構成する金属としては、ケイ素、チタン、タングステン、ハフニウム、ジルコニウム、クロム、ゲルマニウム、銅、アルミニウム、インジウム、ガリウム、ヒ素、パラジウム、鉄、タンタル、イリジウム、又はモリブデンのいずれか、あるいはこれらの合金を用いることができ、このような金属を含む被加工層としては、例えば、Si、SiO2、SiN、SiON、SiOC、p−Si、α−Si、TiN、WSi、BPSG、SOG、Cr、CrO、CrON、MoSi、W、W−Si、Al、Cu、Al−Si等及び種々の低誘電膜及びそのエッチングストッパー膜が用いられ、通常、50〜10,000nm、特に100〜5,000nmの厚さに形成し得る。
図2に示す製造装置10を以下の手順で洗浄した。ろ過機4に孔径が20nmのポリエチレン製フィルターカートリッジをセットし、次に100Lの調整タンク1の供給口6から洗浄液としてプロピレングリコールメチルエーテルアセテート(以下、PGMEA)を20L供給した。攪拌機2で1時間撹拌した後、攪拌機2を停止してタンクバルブV1と循環バルブV3を開、抜出バルブV2を閉としてから送液ポンプ3を起動し、PGMEAを24時間循環した。このPGMEAを、抜出バルブV2を開として、装置外に排出した。これと同じ操作をもう一度繰り返し、装置外にPGMEAを排出する際に、清浄なガラス瓶で捕集した。アジレント・テクノロジー社製7700s(ICP−MS)を用いて捕集したPGMEA中の金属成分の濃度を測定、算出した。
ろ過機4にセットするポリエチレン製フィルターカートリッジの孔径を10nmにした以外は洗浄例1と全く同様の構成の装置を用い、洗浄例1と同様の方法で洗浄した後に金属成分の濃度を測定、算出した。
ろ過機4にセットするポリエチレン製フィルターカートリッジの孔径を3nmにした以外は洗浄例1と全く同様の構成の装置を用い、洗浄例1と同様の方法で洗浄した後に金属成分の濃度を測定、算出した。
ろ過機4にセットするフィルターカートリッジを孔径が10nmのナイロン製フィルターカートリッジにした以外は洗浄例1と全く同様の構成の装置を用い、洗浄例1と同様の方法で洗浄した後に金属成分の濃度を測定、算出した。
ろ過機4にセットするフィルターカートリッジを孔径が20nmのテフロン(登録商標)製フィルターカートリッジにした以外は洗浄例1と全く同様の構成の装置を用い、洗浄例1と同様の方法で洗浄した後に金属成分の濃度を測定、算出した。
洗浄液をプロピレングリコールメチルエーテル(以下、PGME)にした以外は洗浄例1と全く同様の構成の装置を用い、洗浄例1と同様の方法で洗浄した後に金属成分の濃度を測定、算出した。
洗浄例1と同様の構成の製造装置10を用い、PGMEAによる洗浄を1度のみ(繰り返さずに)行い、排出されたPGMEAを用いて洗浄例1と同様に金属成分の濃度を測定、算出した。
100nm膜厚の窒化ケイ素膜が形成されているシリコンウエハー上に、S2−1〜7、S3−1〜7、S4−1〜7、S5−1〜7を塗布して350℃で60秒間加熱して、膜厚200nmの有機下層膜を作成した。次に、その上にS1−1〜7を塗布して240℃で60秒間加熱して、膜厚35nmのケイ素含有レジスト下層膜を作成した。続いて、表2に記載のポジ現像用ArFレジスト溶液(PR−1)を塗布し、110℃で60秒間ベークして膜厚100nmのフォトレジスト膜を形成した。さらにフォトレジスト膜上に表3に記載の液浸保護膜(TC−1)を塗布し90℃で60秒間ベークし膜厚50nmの保護膜を形成した。
上記、パターニング試験で作成しレジストパターンをマスクにしてケイ素含有レジスト下層膜の加工を条件(1)でドライエッチングし、次いで条件(2)でドライエッチングし有機下層膜にパターンを転写し、さらに、条件(3)でドライエッチングし窒化ケイ素膜にパターン転写した。得られたパターンの断面形状を(株)日立製作所製電子顕微鏡(S−9380)で、KLA−Tencor社製明視野欠陥検査装置KLA2800でパターン欠陥を観測し、その結果を表5にまとめた。
装置:東京エレクトロン(株)製ドライエッチング装置Telius SP
エッチング条件(1):
チャンバー圧力 15Pa
Upper/Lower RFパワー 500W/300W
CHF3ガス流量 50ml/min
CF4ガス流量 150ml/min
処理時間 40sec
チャンバー圧力 2Pa
Upper/Lower RFパワー 1000W/300W
CO2ガス流量 320ml/min
N2ガス流量 80ml/min
処理時間 30sec
チャンバー圧力 20Pa
Upper/Lower RFパワー 500W/300W
CHF3ガス流量 30ml/min
CF4ガス流量 170ml/min
処理時間 40sec
これらのことから、本発明のレジスト組成物の製造方法で製造されたレジスト組成物を用いれば、従来のものよりもエッチング欠陥を低減できるが、多層レジスト法において、従来のものと組み合わせて用いた場合は、エッチング欠陥の低減効果が若干落ちてしまうことが明らかになった。また、多層レジスト法において、用いるレジスト組成物を全て本発明の製造方法で製造したものとした場合、エッチング欠陥を大幅に低減できることが明らかになった。
6…供給口、 10…製造装置、 V1…タンクバルブ、 V2…抜出バルブ、
V3…循環バルブ。
Claims (9)
- 半導体装置製造工程で使用されるレジスト組成物の製造方法であって、
調製タンク、配管、ポンプ、ろ過機、及びバルブを含むレジスト組成物の製造装置の該調製タンク、配管、ポンプ、ろ過機、及びバルブを、洗浄液を循環させて洗浄し、該洗浄液を前記製造装置から取り出して分析し、該洗浄液中に含まれる金属成分の濃度が5ppb以下となるまで洗浄液を循環させて洗浄した後に、該洗浄液を前記レジスト組成物の製造装置から排出し、その後、前記製造装置で前記レジスト組成物を製造することを特徴とするレジスト組成物の製造方法。 - 前記洗浄液の分析において、誘導結合プラズマ質量分析機、誘導結合プラズマ発光分析機、及び原子吸光分析機のいずれかを用いて前記金属成分の濃度を算出することを特徴とする請求項1に記載のレジスト組成物の製造方法。
- 前記洗浄液中に含まれる金属成分のうち、鉄、クロム、ニッケルの濃度の合計が2ppb以下となるまで循環させて洗浄することを特徴とする請求項1又は請求項2に記載のレジスト組成物の製造方法。
- 前記レジスト組成物として、芳香族化合物を繰り返し単位として有する有機レジスト組成物を用いることを特徴とする請求項1から請求項3のいずれか一項に記載のレジスト組成物の製造方法。
- 前記芳香族化合物が、フェノール誘導体、ナフタレン誘導体、ナフトール誘導体、アントラセン誘導体、ピレン誘導体のいずれか一つ以上を含むものであることを特徴とする請求項4に記載のレジスト組成物の製造方法。
- 前記有機レジスト組成物が、フェノール誘導体又はナフトール誘導体もしくはその両方とアルデヒド誘導体を反応して得られる化合物および溶剤を含むものであることを特徴とする請求項4又は請求項5に記載のレジスト組成物の製造方法。
- 前記レジスト組成物として、ケイ素含有レジスト組成物を用いることを特徴とする請求項1から請求項3のいずれか一項に記載のレジスト組成物の製造方法。
- 前記ケイ素含有レジスト組成物が、ポリシロキサンを含むものであることを特徴とする請求項7に記載のレジスト組成物の製造方法。
- 前記ケイ素含有レジスト組成物中のケイ素分が10%以上であることを特徴とする請求項7又は請求項8に記載のレジスト組成物の製造方法。
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