JP6471873B2 - レジスト下層膜形成組成物 - Google Patents
レジスト下層膜形成組成物 Download PDFInfo
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- JP6471873B2 JP6471873B2 JP2016529156A JP2016529156A JP6471873B2 JP 6471873 B2 JP6471873 B2 JP 6471873B2 JP 2016529156 A JP2016529156 A JP 2016529156A JP 2016529156 A JP2016529156 A JP 2016529156A JP 6471873 B2 JP6471873 B2 JP 6471873B2
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- underlayer film
- resist underlayer
- film forming
- forming composition
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- 229940100515 sorbitan Drugs 0.000 description 1
- 229940035044 sorbitan monolaurate Drugs 0.000 description 1
- 239000001593 sorbitan monooleate Substances 0.000 description 1
- 235000011069 sorbitan monooleate Nutrition 0.000 description 1
- 229940035049 sorbitan monooleate Drugs 0.000 description 1
- 239000001570 sorbitan monopalmitate Substances 0.000 description 1
- 235000011071 sorbitan monopalmitate Nutrition 0.000 description 1
- 229940031953 sorbitan monopalmitate Drugs 0.000 description 1
- 239000001587 sorbitan monostearate Substances 0.000 description 1
- 235000011076 sorbitan monostearate Nutrition 0.000 description 1
- 229940035048 sorbitan monostearate Drugs 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 229960000790 thymol Drugs 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
- 150000003672 ureas Chemical class 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- 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
- G03F7/09—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
-
- 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
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/02—Condensation polymers of aldehydes or ketones with phenols only of ketones
-
- 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
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
- C09D161/16—Condensation polymers of aldehydes or ketones with phenols only of ketones with phenols
-
- 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
-
- 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
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/094—Multilayer resist systems, e.g. planarising layers
-
- 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
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/162—Coating on a rotating support, e.g. using a whirler or a spinner
-
- 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
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/168—Finishing the coated layer, e.g. drying, baking, soaking
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- 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
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3081—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their composition, e.g. multilayer masks, materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- 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
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/3086—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
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- General Physics & Mathematics (AREA)
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- Condensed Matter Physics & Semiconductors (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials For Photolithography (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
Description
本発明の課題は耐エッチング性を有し且つ、凹部及び/又は凸部を有する表面の埋め込み性に優れるレジスト下層膜を形成できる下層膜形成組成物を提供することにある。
(式中、Xはアリーレン基を表し、nは1又は2を表し、R1、R2、R3及びR4はそれぞれ独立に水素原子、ヒドロキシ基、炭素原子数1乃至3のアルキル基又はフェニル基を表す。)
で表される構造単位を有するポリマー、及び溶剤を含むレジスト下層膜形成組成物である。
前記架橋剤としては、また、少なくとも2つのブロックイソシアネート基を有する化合物を使用することもできる。このような化合物として、例えば、三井化学(株)製のタケネート〔登録商標〕B−830、同B−870N、エボニックデグサ社製のVESTANAT〔登録商標〕B1358/100が挙げられる。
GPCカラム:TSKgel SuperMultipore〔登録商標〕Hz−N(東ソー(株))
カラム温度:40℃
溶媒:テトラヒドロフラン(THF)
流量:0.35ml/分
標準試料:ポリスチレン(東ソー(株))
窒素下、100mL三口フラスコに2,7−ジヒドロキシナフタレン(8.00g、0.0499mol、東京化成工業(株)製)、9−フルオレノン(9.00g、0.0499mol、東京化成工業(株)製)、パラトルエンスルホン酸一水和物(2.5803g、0.0150mol、東京化成工業(株)製)及び助触媒として3−メルカプトプロピオン酸(0.4776g、0.0045mol、東京化成工業(株)製)を加え、さらにプロピレングリコールモノメチルエーテル(19.58g、関東化学(株)製)を仕込み、撹拌し、120℃まで昇温して各成分を溶解し、重合を開始した。96時間後得られたポリマー液を室温まで放冷し、メタノール(500g、関東化学(株)製)中に加え、再沈殿させた。得られた沈殿物を濾過して集め、減圧乾燥機で50℃、10時間乾燥し、目的とする下記式(2−16)で表される構造単位を有するポリマー(以下、本明細書では2,7−DHN−Flと略称する。)16.32gを得た。2,7−DHN−Flの、GPCによるポリスチレン換算で測定される重量平均分子量Mwは1400、多分散度Mw/Mnは1.95であった。
窒素下、100mL三口フラスコに2,7−ジヒドロキシナフタレン(8.00g、0.0499mol、東京化成工業(株)製)、ベンゾフェノン(9.10g、0.0499mol、東京化成工業(株)製)、パラトルエンスルホン酸一水和物(2.5803g、0.0150mol、東京化成工業(株)製)及び助触媒として3−メルカプトプロピオン酸(0.4776g、0.0045mol、東京化成工業(株)製)を加え、さらにプロピレングリコールモノメチルエーテル(19.68g、関東化学(株)製)を仕込み、撹拌し、120℃まで昇温して各成分を溶解し、重合を開始した。96時間後得られたポリマー液を室温まで放冷し、メタノール(500g、関東化学(株)製)中に加え再沈殿させた。得られた沈殿物を濾過して集め、減圧乾燥機で50℃、10時間乾燥し、目的とする下記式(1−16)で表される構造単位を有するポリマー(以下、本明細書では2,7−DHN−BzPnと略称する。)11.97gを得た。2,7−DHN−BzPnの、GPCによるポリスチレン換算で測定される重量平均分子量Mwは1800、多分散度Mw/Mnは1.89であった。
窒素下、100mL三口フラスコに2,7−ジヒドロキシナフタレン(6.50g、0.0406mol、東京化成工業(株)製)、4−ヒドロキシベンゾフェノン(8.04g、0.0406mol、東京化成工業(株)製)、メタンスルホン酸(1.1701g、0.0122mol、東京化成工業(株)製)及び助触媒として3−メルカプトプロピオン酸(0.3927g、0.0037mol、東京化成工業(株)製)を加え、さらにプロピレングリコールモノメチルエーテル(15.71g、関東化学(株)製)を仕込み、撹拌し、120℃まで昇温して各成分を溶解し、重合を開始した。96時間後得られたポリマー液を室温まで放冷し、メタノール(500g、関東化学(株)製)中に加え再沈殿させた。得られた沈殿物を濾過して集め、減圧乾燥機で50℃、10時間乾燥し、目的とする下記式(1−19)で表される構造単位を有するポリマー(以下、本明細書では2,7−DHN−4−HBzPnと略称する。)5.82gを得た。2,7−DHN−4−HBzPnの、GPCによるポリスチレン換算で測定される重量平均分子量Mwは2900、多分散度Mw/Mnは1.87であった。
窒素下、100mL三口フラスコに2,7−ジヒドロキシナフタレン(6.50g、0.0406mol、東京化成工業(株)製)、3−メチルベンゾフェノン(7.96g、0.0406mol、東京化成工業(株)製)、メタンスルホン酸(1.1701g、0.0122mol、東京化成工業(株)製)及び助触媒として3−メルカプトプロピオン酸(0.3927g、0.0037mol、東京化成工業(株)製)を加え、さらにプロピレングリコールモノメチルエーテル(15.71g、関東化学(株)製)を仕込み、撹拌し、120℃まで昇温して各成分を溶解し、重合を開始した。96時間後得られたポリマー液を室温まで放冷し、メタノール(500g、関東化学(株)製)中に加え再沈殿させた。得られた沈殿物を濾過して集め、減圧乾燥機で50℃、10時間乾燥し、目的とする下記式(1−17)で表される構造単位を有するポリマー(以下、本明細書では2,7−DHN−4−MBzPnと略称する。)7.23gを得た。2,7−DHN−4−MBzPnの、GPCによるポリスチレン換算で測定される重量平均分子量Mwは4600、多分散度Mw/Mnは2.40であった。
窒素下、100mL三口フラスコに2,7−ジヒドロキシナフタレン(6.50g、0.0406mol、東京化成工業(株)製)、2−メチルベンゾフェノン(7.96g、0.0406mol、東京化成工業(株)製)、メタンスルホン酸(1.1701g、0.0122mol、東京化成工業(株)製)及び助触媒として3−メルカプトプロピオン酸(0.3927g、0.0037mol、東京化成工業(株)製)を加え、さらにプロピレングリコールモノメチルエーテル(15.71g、関東化学(株)製)を仕込み、撹拌し、120℃まで昇温して各成分を溶解し、重合を開始した。96時間後得られたポリマー液を室温まで放冷し、メタノール(500g、関東化学(株)製)中に加え再沈殿させた。得られた沈殿物を濾過して集め、減圧乾燥機で50℃、10時間乾燥し、目的とする下記式(1−18)で表される構造単位を有するポリマー(以下、本明細書では2,7−DHN−2−MBzPnと略称する。)4.34gを得た。2,7−DHN−2−MBzPnの、GPCによるポリスチレン換算で測定される重量平均分子量Mwは2200、多分散度Mw/Mnは1.68であった。
100mlナスフラスコにフロログルシノール(東京化成工業(株)製)5.51g、ベンズアルデヒド(東京化成工業(株)製)4.27g、1,4−ジオキサン(関東化学(株)製)10.09g、p−トルエンスルホン酸一水和物(東京化成工業(株)製)0.76gを入れた。その後これらを110℃まで加熱し、約2時間還流撹拌した。反応終了後、反応物をテトラヒドロフラン(関東化学製)7.54gで希釈し、沈殿物を濾過により除去した。回収した濾液をメタノール/水混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引濾過し、ろ物を85℃で一晩減圧乾燥し、下記式で表される構造単位を有する、茶褐色粉末のフロログルシノール樹脂を7.25g得た。GPCによりポリスチレン換算で測定される重量平均分子量Mwは3,600、多分散度Mw/Mnは1.34であった。
合成例1で得たポリマー1gに、界面活性剤としてメガファックR−30(DIC(株)製)0.003gを混合し、これをプロピレングリコールモノメチルエーテルアセテート4gに溶解して溶液とした。その後、該溶液を孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、リソグラフィープロセスに用いるレジスト下層膜形成組成物を調製した。
合成例2で得たポリマー1gに、界面活性剤としてメガファックR−30(DIC(株)製)0.003gを混合し、これをプロピレングリコールモノメチルエーテルアセテート4gに溶解して溶液とした。その後、該溶液を孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、リソグラフィープロセスに用いるレジスト下層膜形成組成物を調製した。
合成例3で得たポリマー1gに、界面活性剤としてメガファックR−30(DIC(株)製)0.003gを混合し、これをプロピレングリコールモノメチルエーテルアセテート4gに溶解して溶液とした。その後、該溶液を孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、リソグラフィープロセスに用いるレジスト下層膜形成組成物を調製した。
合成例4で得たポリマー1gに、界面活性剤としてメガファックR−30(DIC(株)製)0.003gを混合し、これをプロピレングリコールモノメチルエーテルアセテート4gに溶解して溶液とした。その後、該溶液を孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、リソグラフィープロセスに用いるレジスト下層膜形成組成物を調製した。
合成例5で得たポリマー1gに、界面活性剤としてメガファックR−30(DIC(株)製)0.003gを混合し、これをプロピレングリコールモノメチルエーテルアセテート4gに溶解して溶液とした。その後、該溶液を孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、リソグラフィープロセスに用いるレジスト下層膜形成組成物を調製した。
比較合成例1で得たポリマー1gに、界面活性剤としてメガファックR−30(DIC(株)製)0.003gを混合し、これをプロピレングリコールモノメチルエーテルアセテート4gに溶解して溶液とした。その後、該溶液を孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、リソグラフィープロセスに用いるレジスト下層膜形成組成物を調製した。
市販のクレゾールノボラック樹脂(クレゾールとホルムアルデヒドを用いて得られたノボラック樹脂)1gに、界面活性剤としてメガファックR−30(DIC(株)製)0.003gを混合し、これをプロピレングリコールモノメチルエーテルアセテート4gに溶解して溶液とした。その後、該溶液を孔径0.10μmのポリエチレン製ミクロフィルターを用いて濾過し、更に、孔径0.05μmのポリエチレン製ミクロフィルターを用いて濾過して、リソグラフィープロセスに用いるレジスト下層膜形成組成物を調製した。本比較例で使用したクレゾールノボラック樹脂の、GPCによるポリスチレン換算で測定される重量平均分子量Mwは4000、多分散度Mw/Mnは2.1であった。
実施例1乃至実施例5、比較例1及び比較例2で調製したレジスト下層膜形成組成物を、それぞれスピンコーターを用いてシリコンウェハー上に塗布した。それらをホットプレート上で350℃の温度で1分間ベークし、レジスト下層膜(膜厚0.25μm)を形成した。このレジスト下層膜をレジストに使用する溶剤(乳酸エチル、プロピ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メチルエーテルアセテート及びシクロヘキサノン)に浸漬し、これらの溶剤に不溶であることを確認した。
ドライエッチング速度の測定に用いたエッチャー及びエッチングガスは以下のものである。
エッチャー:RIE−10NR(サムコ(株)製)
エッチングガス:CF4
実施例1乃至実施例5、比較例1及び比較例2で調製したレジスト下層膜形成組成物を、それぞれスピンコーターを用いてシリコンウェハー上に塗布した。それらをホットプレート上で350℃の温度で1分間ベークし、レジスト下層膜(膜厚0.25μm)を形成した。エッチングガスとしてCF4ガスを使用して、これらのレジスト下層膜のドライエッチング速度を測定した。また、フェノールノボラック樹脂(市販品、GPCによるポリスチレン換算で測定される重量平均分子量Mwは2000、多分散度Mw/Mnは2.5)の溶液を、スピンコーターを用いてシリコンウェハー上に塗布し、ホットプレート上で205℃1分間ベークしてフェノールノボラック樹脂膜(膜厚0.25μm)を形成した。エッチングガスとしてCF4ガスを使用して、そのフェノールノボラック樹脂膜のドライエッチング速度を測定した。このフェノールノボラック樹脂膜のドライエッチング速度を1.00とした時の、実施例1乃至実施例5、比較例1及び比較例2で調製したレジスト下層膜形成組成物から形成したレジスト下層膜のドライエッチング速度を、ドライエッチング速度比として算出した結果を表1に示す。ドライエッチング速度比が小さいほど、CF4ガスに対する耐エッチング性が高いことを示す。
ドライエッチング速度比=(レジスト下層膜のドライエッチング速度)/(フェノールノボラック樹脂膜のドライエッチング速度)
実施例1乃至実施例5及び比較例1で調製したレジスト下層膜形成組成物を、それぞれスピンコーターを用いてホールウェハー上に塗布した。それらをホットプレート上で350℃の温度で1分間ベークし、レジスト下層膜(ホールパターン未形成部の膜厚0.25μm)を形成した。前記ホールウェハーとして、直径100nm、高さ400nmのホールパターンが形成されたウェハーを用いた。実施例1乃至実施例5で調製したレジスト下層膜形成組成物を、スピンコーターを用いてホールウェハー上に塗布し、350℃の温度で1分間ベークした後のホールウェハーの断面を、走査型電子顕微鏡(SEM)で観察した。その結果、図1乃至図5に示す断面SEM写真が示すように、ホール内部まで十分にレジスト下層膜で充填されていた。一方、比較例1で調製したレジスト下層膜形成組成物を、スピンコーターを用いてホールウェハー上に塗布し、350℃の温度で1分間ベークした後のホールウェハーの断面を、走査型電子顕微鏡で観察した。その結果、図6に示す断面SEM写真が示すように、ホール内部にボイド(空洞)が存在していた。
Claims (6)
- 下記式(1):
(式中、Xはアリーレン基を表し、nは1又は2を表し、R1、R2、R3及びR4はそれぞれ独立に水素原子、ヒドロキシ基、炭素原子数1乃至3のアルキル基又はフェニル基を表す。)
で表される構造単位を有するポリマー、及び溶剤を含むレジスト下層膜形成組成物。 - 前記アリーレン基はフェニレン基又はナフチレン基である請求項1に記載のレジスト下層膜形成組成物。
- 前記式(1)で表される構造単位は、下記式(1−1)乃至(1−20)
で表される構造単位からなる群から選択される構造単位である、請求項1又は請求項2に記載のレジスト下層膜形成組成物。 - 架橋剤をさらに含む請求項1乃至請求項3のいずれか一項に記載のレジスト下層膜形成組成物。
- 架橋反応を促進させる酸性化合物をさらに含む請求項4に記載のレジスト下層膜形成組成物。
- 界面活性剤をさらに含む請求項1乃至請求項5のいずれか一項に記載のレジスト下層膜形成組成物。
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