JP6088800B2 - パターン形成方法 - Google Patents
パターン形成方法 Download PDFInfo
- Publication number
- JP6088800B2 JP6088800B2 JP2012245531A JP2012245531A JP6088800B2 JP 6088800 B2 JP6088800 B2 JP 6088800B2 JP 2012245531 A JP2012245531 A JP 2012245531A JP 2012245531 A JP2012245531 A JP 2012245531A JP 6088800 B2 JP6088800 B2 JP 6088800B2
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- Prior art keywords
- layer
- pattern
- block copolymer
- film
- resist
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 150000001721 carbon Chemical class 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
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- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 125000005233 alkylalcohol group Chemical group 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
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- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
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- GPTJTTCOVDDHER-UHFFFAOYSA-N cyclononane Chemical compound C1CCCCCCCC1 GPTJTTCOVDDHER-UHFFFAOYSA-N 0.000 description 1
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- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
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- 230000001678 irradiating effect Effects 0.000 description 1
- 229940117955 isoamyl acetate Drugs 0.000 description 1
- DOULWWSSZVEPIN-UHFFFAOYSA-N isoproturon-monodemethyl Chemical compound CNC(=O)NC1=CC=C(C(C)C)C=C1 DOULWWSSZVEPIN-UHFFFAOYSA-N 0.000 description 1
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- BDJSOPWXYLFTNW-UHFFFAOYSA-N methyl 3-methoxypropanoate Chemical compound COCCC(=O)OC BDJSOPWXYLFTNW-UHFFFAOYSA-N 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- DIOQZVSQGTUSAI-UHFFFAOYSA-N n-butylhexane Natural products CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 1
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 description 1
- 229910021334 nickel silicide Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- LKEDKQWWISEKSW-UHFFFAOYSA-N nonyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCOC(=O)C(C)=C LKEDKQWWISEKSW-UHFFFAOYSA-N 0.000 description 1
- MDYPDLBFDATSCF-UHFFFAOYSA-N nonyl prop-2-enoate Chemical compound CCCCCCCCCOC(=O)C=C MDYPDLBFDATSCF-UHFFFAOYSA-N 0.000 description 1
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- ANISOHQJBAQUQP-UHFFFAOYSA-N octyl prop-2-enoate Chemical compound CCCCCCCCOC(=O)C=C ANISOHQJBAQUQP-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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- 229920000196 poly(lauryl methacrylate) Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
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- NHARPDSAXCBDDR-UHFFFAOYSA-N propyl 2-methylprop-2-enoate Chemical compound CCCOC(=O)C(C)=C NHARPDSAXCBDDR-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005389 semiconductor device fabrication Methods 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- WQJQOUPTWCFRMM-UHFFFAOYSA-N tungsten disilicide Chemical compound [Si]#[W]#[Si] WQJQOUPTWCFRMM-UHFFFAOYSA-N 0.000 description 1
- 229910021342 tungsten silicide Inorganic materials 0.000 description 1
- RRLMGCBZYFFRED-UHFFFAOYSA-N undecyl prop-2-enoate Chemical compound CCCCCCCCCCCOC(=O)C=C RRLMGCBZYFFRED-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0334—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/0337—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers 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
-
- 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
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist 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
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
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Description
なお、図面は模式的または概念的なものであり、各部分の厚みと幅との関係、部分間の大きさの比率などは、必ずしも現実のものと同一とは限らない。また、同じ部分を表す場合であっても、図面により互いの寸法や比率が異なって表される場合もある。
図2(a)〜図2(c)は、実施形態に係るパターン形成方法を例示する模式的平面図である。
ブロック共重合体は、例えば、同一種類のモノマーが連続して複数結合したもの(ブロック)を含む。各々のブロックは、互いに化学結合している。ブロック共重合体において、ブロック状になった複数種類のポリマーが互いに化学結合している。ポリマー間の斥力によりミクロ相分離させることで、微細な周期パターンが形成される。ブロック共重合体相分離構造のモルフォロジー(形態)は、ブロックの体積分率により決まる。モルフォロジーは、例えば、シリンダ構造及びラメラ構造などを含む。
図5(a)〜図5(f)は、実施形態に係るパターン形成を例示する模式的平面図である。
したがって、PSよりも疎水性のポリマーのとしてアクリルを選択した。
図6は、アクリルの側鎖の炭素数における水の接触角を表すグラフ図である。
図6には、ポリnヘキシルメタクリレート(PnHMA)、ポリスチレン(PS)、ポリnブチルメタクリレート(PnBMA)、ポリnプロピルメタクリレート(PnPMA)、およびポリメチルメタクリレート(PMMA)のそれぞれの水に対する接触角が表されている。水の接触角を表面エネルギーの指標とした。水の接触角が大きくなると表面エネルギーが小さくなる。一方、水の接触角が小さくなると表面エネルギーが大きくなる。
図7(a)〜図7(f)には、塗布直後のブロック共重合体の平面AFM像(上段)と、アニール処理後のブロック共重合体の平面AFM像(下段)と、が例示されている。また、AFM像では、物理ガイドが設けられていない。すなわち、このAFM像では、2種類のポリマーA、Bを含むブロック共重合体層が所定の温度でポリマーAを含む層とポリマーBを含む層とに相分離するかが確認されている。なお、それぞれのアニール時間は、8時間とした。
図7(b)及び図7(e)には、PS−b−PnBMA層の平面AFM像が例示されている。アニール前(図7(b))のPS−b−PnBMA層においては、相分離パターンが現れなかった。また、図7(e)に示すようにアニール処理後においても、相分離パターンが現れなかった。アニール温度は、180℃である。なお、熱重量分析により180℃以上ではPnBMAが分解してしまうので、アニール温度は、180℃が上限である。従って、PS−b−PnBMA層は、180℃においても相分離しにくいことが分かった。
<実施例1>
Si基板上にArF露光用のフォトレジスト(JSR社製AR2395)を1500rpm、30秒間の条件で回転塗布する。続いて120℃、90秒でプリベイクした後、C/Hパターンのレチクルを用いてArFエキシマレーザでパターン露光を行う。露光量は25mJ/cm2とする。PEB(Post Exposure Bake)を125℃、60秒で行い、2.38%TMAH(テトラメチルアンモニウムヒドロキシド)で現像を行う。続いて現像後のフォトレジストをArFエキシマレーザで全面露光を行う。露光量は25mJ/cm2とする。続いて185℃、120秒でのアニールによりフォトレジストを硬化させる。フォトレジストを全面露光し、アニールすることによりブロック共重合体溶液に対して不溶化させる。ここで全面露光に用いる光源をKrFエキシマレーザ、低圧水銀灯、あるいは高圧水銀灯に変えても同様な結果が得られる。ただし、低圧水銀灯と高圧水銀灯の露光量は波長254nmに換算した値を用いる。このようにしてフォトレジストの膜厚が125nm、開口した径が70nmのC/Hパターン(物理ガイド)を得る。
相分離後のPS−b−PnHMAを選択的に除去する方法をウェットエッチングにした場合を示す。
最上層にW(タングステン)配線(配線幅100nm)とそれを被覆したTEOS膜(膜厚150nm)で構成されている半導体回路基板上にSOC層(膜厚150nm)、SOG層(膜厚45nm)の順に積層させる。JSR社製CT08を用いて1500rpm、30秒でTEOS膜上に回転塗布してSOC層を形成する。その後、JSR社製SOG080を用いて1500rpm、30秒でSOC上に回転塗布してSOG層を形成する。続いて、その多層膜上にArF露光用のフォトレジスト(JSR社製AR2395)を1500rpm、30秒間の条件で回転塗布する。続いて120℃、90秒でプリベイクした後、C/Hパターンのレチクルを用いてArFエキシマレーザでパターン露光を行う。露光量は25mJ/cm2とする。PEBを125℃、60秒で行い、2.38%TMAHで現像を行う。続いて現像後のフォトレジストをArFエキシマレーザで全面露光を行う。露光量は25mJ/cm2とする。続いて185℃、120秒でのアニールによりフォトレジストを硬化させる。フォトレジストを全面露光し、アニールすることによりブロック共重合体溶液に対して不溶化させる。ここで全面露光に用いる光源をKrFエキシマレーザ、低圧水銀灯、高圧水銀灯に変えても同様な結果が得られる。ただし、低圧水銀灯と高圧水銀灯の露光量は波長254nmに換算した値を用いる。このようにしてフォトレジストの膜厚が125nm、開口した径が70nmのC/Hパターン(物理ガイド)を得る。
用いるブロック共重合体をPS−b−PnHMAからPS−b−PnOMA(ポリスチレン−ポリオクタデシルメタクリレートブロック共重合体)に変更した場合を示す。
用いるブロック共重合体をPS−b−PMMAにする場合、PS−b−PnHMAのような適切なC/Hパターンができない例を示す。
用いるブロック共重合体をPS−b−PnBMAにする場合、PS−b−PnHMAのような微細なC/Hパターンができない例を示す。
Claims (4)
- 下地層の上に設けられ開口部を有するレジスト層の前記開口部内に、ポリスチレン誘導体と、側鎖の炭素数が6以上18以下のアクリルと、を含むブロック共重合体層を形成する工程と、
前記ブロック共重合体層を相分離させて、前記開口部内に前記ポリスチレン誘導体を含む第1の層と前記アクリルを含む第2の層とを形成する工程と、
前記第2の層を除去する工程と、
を備え、
前記第1の層と前記第2の層とを形成する工程は、前記開口部内に、前記第1の層と前記第2の層とを含むシリンダ構造を形成することを含み、
前記ポリスチレン誘導体は、ポリスチレンを含み、前記アクリルは、ポリヘキシルメタクリレートを含む、パターン形成方法。 - 前記ブロック共重合体層を形成する前に、前記レジスト層を形成する工程をさらに備え、
前記レジスト層の前記形成は、前記レジスト層に前記開口部が形成された後に、前記レジスト層を架橋させて、前記レジスト層を、前記ブロック共重合体層を溶解する溶媒に対して不溶化させることを含む請求項1記載のパターン形成方法。 - 前記下地層は、シリコン化合物を含む第3の層と、前記第3の層の下に設けられた被加工膜と、を含み、
前記レジスト層と前記第1の層をマスクにして前記第3の層をエッチングする工程と、
前記エッチングされた前記第3の層をマスクにして前記第3の層の下に設けられた前記被加工膜をエッチングして、前記エッチングされた前記被加工膜のパターンを形成する工程と、
をさらに備えた請求項1または2に記載のパターン形成方法。 - 前記下地層は、シリコン化合物を含む第3の層と、前記第3の層の下に設けられた被加工膜と、を含み、
前記第3の層と前記被加工膜との間に有機膜を形成する工程と、
前記レジスト層と前記第1の層をマスクにして前記第3の層をエッチングする工程と、
前記第3の層をマスクに前記有機膜をエッチングする工程と、
をさらに備えた請求項1または2に記載のパターン形成方法。
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CN108511388B (zh) * | 2017-02-27 | 2023-07-21 | Imec 非营利协会 | 使目标层图案化的方法 |
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