TWI627220B - 用於圖案處理之組合物及方法 - Google Patents
用於圖案處理之組合物及方法 Download PDFInfo
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- TWI627220B TWI627220B TW105116936A TW105116936A TWI627220B TW I627220 B TWI627220 B TW I627220B TW 105116936 A TW105116936 A TW 105116936A TW 105116936 A TW105116936 A TW 105116936A TW I627220 B TWI627220 B TW I627220B
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- 239000000203 mixture Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title abstract description 52
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- 229920001400 block copolymer Polymers 0.000 claims abstract description 47
- 239000004065 semiconductor Substances 0.000 claims abstract description 17
- 239000003960 organic solvent Substances 0.000 claims abstract description 16
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 12
- 239000001257 hydrogen Substances 0.000 claims abstract description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 125000001931 aliphatic group Chemical group 0.000 claims abstract description 9
- 238000003672 processing method Methods 0.000 claims abstract description 9
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 8
- 229920002120 photoresistant polymer Polymers 0.000 claims description 61
- 239000002253 acid Substances 0.000 claims description 33
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- 125000000217 alkyl group Chemical group 0.000 claims description 8
- 150000001412 amines Chemical class 0.000 claims description 6
- 125000003118 aryl group Chemical group 0.000 claims description 6
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 claims description 5
- 238000005530 etching Methods 0.000 claims description 5
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 5
- VZXTWGWHSMCWGA-UHFFFAOYSA-N 1,3,5-triazine-2,4-diamine Chemical compound NC1=NC=NC(N)=N1 VZXTWGWHSMCWGA-UHFFFAOYSA-N 0.000 claims description 3
- 125000005073 adamantyl group Chemical group C12(CC3CC(CC(C1)C3)C2)* 0.000 claims description 3
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 claims description 3
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- 238000005406 washing Methods 0.000 claims description 3
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical group CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 claims description 2
- 125000002950 monocyclic group Chemical group 0.000 claims description 2
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- ZQMHJBXHRFJKOT-UHFFFAOYSA-N methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate Chemical compound COC(=O)C(C)(C)N=NC(C)(C)C(=O)OC ZQMHJBXHRFJKOT-UHFFFAOYSA-N 0.000 description 7
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- RDOXTESZEPMUJZ-UHFFFAOYSA-N anisole Chemical compound COC1=CC=CC=C1 RDOXTESZEPMUJZ-UHFFFAOYSA-N 0.000 description 4
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- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 125000002843 carboxylic acid group Chemical group 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
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- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
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- 150000004714 phosphonium salts Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- DOIRQSBPFJWKBE-UHFFFAOYSA-N phthalic acid di-n-butyl ester Natural products CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 1
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- 239000010453 quartz Substances 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
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- 150000003335 secondary amines Chemical class 0.000 description 1
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- FVEFRICMTUKAML-UHFFFAOYSA-M sodium tetradecyl sulfate Chemical compound [Na+].CCCCC(CC)CCC(CC(C)C)OS([O-])(=O)=O FVEFRICMTUKAML-UHFFFAOYSA-M 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
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- COBURCRUNDBUGQ-UHFFFAOYSA-N tert-butyl 2-ethylimidazole-1-carboxylate Chemical compound CCC1=NC=CN1C(=O)OC(C)(C)C COBURCRUNDBUGQ-UHFFFAOYSA-N 0.000 description 1
- SJMYWORNLPSJQO-UHFFFAOYSA-N tert-butyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(C)(C)C SJMYWORNLPSJQO-UHFFFAOYSA-N 0.000 description 1
- PWQLFIKTGRINFF-UHFFFAOYSA-N tert-butyl 4-hydroxypiperidine-1-carboxylate Chemical compound CC(C)(C)OC(=O)N1CCC(O)CC1 PWQLFIKTGRINFF-UHFFFAOYSA-N 0.000 description 1
- RUPAXCPQAAOIPB-UHFFFAOYSA-N tert-butyl formate Chemical compound CC(C)(C)OC=O RUPAXCPQAAOIPB-UHFFFAOYSA-N 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 125000005147 toluenesulfonyl group Chemical group C=1(C(=CC=CC1)S(=O)(=O)*)C 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
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- FAYMLNNRGCYLSR-UHFFFAOYSA-M triphenylsulfonium triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 FAYMLNNRGCYLSR-UHFFFAOYSA-M 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
- C08L23/142—Copolymers of propene at least partially crystalline copolymers of propene with other olefins
-
- 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
- G03F7/405—Treatment with inorganic or organometallic reagents after imagewise removal
-
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Abstract
圖案處理組合物包括嵌段共聚物及有機溶劑。所述嵌段共聚物包括第一嵌段及第二嵌段。所述第一嵌段包括由第一單體形成之單元,所述第一單體包括烯系不飽和可聚合基團及氫受體基團,其中所述氫受體基團為含氮基團。所述第二嵌段包括由第二單體形成之單元,所述第二單體包括烯系不飽和可聚合基團及環狀脂族基團。其中:(i)所述第二嵌段包括由第三單體形成之單元,所述第三單體包括烯系不飽和可聚合基團,且所述第二單體與所述第三單體不同;及/或(ii)所述嵌段共聚物包括第三嵌段,所述第三嵌段包括由第四單體形成之單元,所述第四單體包括烯系不飽和可聚合基團,其中所述第四單體與所述第一單體及所述第二單體不同。亦提供使用所描述之組合物的圖案處理方法。所述圖案處理組合物及方法尤其適用於製造提供高解析度圖案之半導體裝置。
Description
本發明大體上係關於電子裝置之製造。更特定言之,本發明係關於用於處理圖案之組合物及使用所述組合物之圖案處理方法。所述組合物及方法發現在用於形成精細圖案之負型顯影收縮製程中製造半導體裝置之特定用途。
在半導體製造業中,使用光阻材料將圖案轉移至安置在半導體基板上之一或多個底層,諸如金屬、半導體及介電層,以及所述基板本身。為了提高半導體裝置之集成密度及允許形成尺寸在奈米範圍內之結構,已開發且繼續開發具有高解析度能力之光阻及光微影處理工具。
正型化學放大光阻習知地用於使用正型顯影(PTD)方法之高解析度處理。在PTD方法中,光阻層之曝光區域可溶於顯影劑溶液(通常水性鹼性顯影劑)中,且自基板表面移除,而不溶於顯影劑之未曝光區在顯影之後保留以形成正像。為了改良光微影效能,已開發浸沒光微影工具以有效地提高成像裝置,例如具有KrF或ArF光源之掃描儀之鏡頭之數值孔徑(NA)。此藉由在成像裝置之最後一個表面與半導體晶片之上表面之間使用相對高折射率流體(亦即浸沒
流體)實現。
自材料及處理觀點已作出大量努力使實際解析度延伸超過正型顯影實現之解析度。一個此類實例為負型顯影(NTD)方法。NTD方法藉由利用使用亮場遮罩印刷臨界暗場層獲得之優良成像品質而允許相比於標準正型成像改良之解析度及製程窗口。NTD抗蝕劑通常採用具有酸不穩定(在本文中亦稱為酸可裂解)基團及光酸產生劑之樹脂。暴露於光化輻射使得光酸產生劑形成酸,其在曝光後烘烤期間導致酸不穩定基團裂解,在曝光區域中產生極性開關。因此,在抗蝕劑之曝光區域與未曝光區域之間產生可溶性特徵之差異,使得抗蝕劑之未曝光區域可藉由有機溶劑顯影劑移除,留下由不溶性曝光區域產生之圖案。
為了進一步將解析能力延伸至藉由標準抗蝕圖案化技術通常獲得之彼等之外,已提出各種用於圖案收縮之方法。此等方法係關於增加抗蝕圖案側壁之有效厚度以減小(亦即「收縮」)例如相鄰刻線之間或溝槽或穿孔圖案內之間距。以此方式,可使得例如由圖案形成之溝槽及接觸孔之特徵較小。已知收縮技術包含例如化學氣相沈積(CVD)輔助、酸擴散抗蝕生長、熱流動及聚合物摻合物自組裝。
CVD輔助收縮方法(參見K.Oyama等人,「朝向22nm節點之強化光阻收縮方法技術(The enhanced photoresist shrink process technique toward 22nm node)」《國際光學工程學會會刊7972(Proc.SPIE 7972)》,抗蝕材料及處理技術之進步(Advances in Resist Materials and Processing Technology)XXVIII,79722Q(2011))使用在包含例如接觸
孔、刻線/間隔或溝槽圖案之光阻圖案上方形成之CVD沈積層。CVD材料經回蝕(etch back),留下抗蝕圖案之側壁上之材料。此增加抗蝕圖案之有效橫向尺寸,進而減少曝光待蝕刻之底層之開放區。CVD輔助收縮技術需要使用成本高之CVD及蝕刻工具,提高方法之複雜度且就方法通量而言不利。
在酸擴散抗蝕生長方法(亦稱為RELACS方法)(參見L.Peters,「抗蝕劑加入次λ革命(Resists Join the Sub-λ Revolution)」,《半導體國際(Semiconductor International)》,1999.9)中,在PTD產生之抗蝕圖案化表面上塗佈酸催化可交聯材料。材料之交聯藉由在烘烤步驟期間擴散至可交聯材料中之存在於抗蝕圖案中之酸組分催化。交聯在酸擴散區中之抗蝕圖案附近之材料中進行以在圖案側壁上形成塗層,進而減小圖案之開放區之橫向尺寸。此方法通常遭受疏密線寬偏差(iso-dense bias;IDB),其中視鄰近抗蝕圖案之密度(其之間的距離)而定,抗蝕圖案上之交聯層跨越模具表面不均勻地生長。因此,基於圖案密度,模具上相同特徵之「收縮」程度可能變化。此可能對於欲成為相同裝置之裝置導致跨越模具之圖案化缺陷及電特徵變化。
聚合物摻合物自組裝(參見Y.Namie等人,「用於定向自組裝之聚合物摻合物(Polymer blends for directed self-assembly)」,《國際光學工程學會會刊8680》,替代光微影技術V(Alternative Lithographic Technologies V),86801M(2013))係關於在光阻圖案上塗佈含有親水性及疏水性聚合物之不可混溶摻合物之組合物。組合物隨後經退火,使得聚合物相分離,其中親水性聚合物優先分離至抗蝕圖案
側壁且疏水性聚合物填充抗蝕圖案側壁之間之體積之其餘部分。疏水性聚合物隨後藉由溶劑顯影移除,留下抗蝕圖案側壁上之親水性聚合物。已發現聚合物摻合物自組裝遭受鄰近及尺寸效應。由於收縮比由兩種聚合物之體積比決定,因此所有特徵藉由相同相對百分比而非藉由相同絕對量收縮。此可能導致與關於酸擴散抗蝕生長技術描述之相同問題。
此項技術中持續需要解決與現有技術水平有關之一或多個問題且允許在電子裝置製造中形成精細圖案之改良圖案處理組合物及圖案處理方法。
根據本發明之第一態樣,提供圖案處理組合物。所述組合物包括嵌段共聚物及有機溶劑。所述嵌段共聚物包括第一嵌段及第二嵌段,其中所述第一嵌段包括由第一單體形成之單元,所述第一單體包括烯系不飽和可聚合基團及氫受體基團,其中氫受體基團為含氮基團。第二嵌段包括由第二單體形成之單元,所述第二單體包括烯系不飽和可聚合基團及環狀脂族基團,且其中:(i)第二嵌段包括由第三單體形成之單元,所述第三單體包括烯系不飽和可聚合基團,且所述第二單體與所述第三單體不同;及/或(ii)嵌段共聚物包括第三嵌段,所述第三嵌段包括由第四單體形成之單元,所述第四單體包括烯系不飽和可聚合基團,其中所述第四單體與所述第一單體及所述第二單體不同。
根據本發明之另一態樣,提供圖案處理方法。所述方法包括:(a)提供半導體基板,其在表面上包括圖案化特徵;(b)向圖案化特徵施用如本文所描述之圖案處理組合
物;以及(c)將殘餘圖案處理組合物自基板洗去,留下結合於圖案化特徵之第一聚合物部分。
亦提供由本文中所描述之方法形成之塗佈之基板及電子裝置。本發明尤其適用於製造提供高解析度圖案之半導體裝置。
本文中所使用之術語僅出於描述特定實施例之目的,且不欲限制本發明。除非上下文另作明確指示,否則如本文所使用,單數形式「一(a/an)」及「所述(the)」欲包含單數形式及複數形式。如聚合物結構中所用之縮寫「b」及「r」分別指嵌段聚合物及隨機聚合物。
100‧‧‧基板
102‧‧‧蝕刻層
104‧‧‧光阻層
104'‧‧‧抗蝕劑圖案
106‧‧‧活化輻射
108‧‧‧圖案化光遮罩
112‧‧‧圖案處理組合物層
112'‧‧‧抗蝕劑圖案之聚合物層
將參考以下附圖描述本發明,其中相同參考標號指示相同特徵,且其中:圖1A-F為用於根據本發明之圖案處理方法之製程流程;及圖2為用根據本發明之圖案處理組合物處理之前及之後CD隨光阻線條/空間圖案之劑量變化之曲線。
本發明之圖案處理組合物包含嵌段共聚物及有機溶劑。所述嵌段共聚物包括第一嵌段及第二嵌段,其中所述第一嵌段包括由第一單體形成之單元,所述第一單體包括烯系不飽和可聚合基團及氫受體基團,所述氫受體基團為含氮基團。所述第二嵌段包括由第二單體形成之單元,所述第二單體包括烯系不飽和可聚合基團及環狀脂族基團。第二嵌
段包括由第三單體形成之單元,所述第三單體包括烯系不飽和可聚合基團,且所述第二單體與第三單體不同;及/或嵌段共聚物包括第三嵌段,所述第三嵌段包括由第四單體形成之單元,所述第四單體包括烯系不飽和可聚合基團,其中所述第四單體與所述第一單體及所述第二單體不同。
當塗佈於圖案(例如NTD形成之光阻圖案,例如接觸孔、溝槽或刻線及間隔圖案)時,所述組合物無論特徵尺寸或密度皆允許一致收縮值。亦即,組合物允許獲得具有最小接近性偏差或無接近性偏差之收縮圖案。另外,圖案處理組合物可使用旋塗工具塗佈,進而允許在與光阻圖案化方法之整合中之簡化處理及簡易性。
嵌段共聚物通常由具有烯系不飽和可聚合基團之單體形成之單元製成。較佳此類單體為具有獨立地選自乙烯基之可聚合基團之彼等單體,例如視情況經氟化之(C1至C3烷基或鹵烷基)丙烯酸酯。適合鹵基烷基丙烯酸酯包含例如氟烷基丙烯酸酯、氯烷基丙烯酸酯、溴烷基丙烯酸酯及碘烷基丙烯酸酯,較佳為氟烷基丙烯酸酯。嵌段共聚物可視情不含鹵烷基,例如不含氟烷基、氯烷基、溴烷基及/或碘烷基。
適於圖案處理組合物之嵌段共聚物可包含兩個或更多個嵌段,例如兩個、三個、四個或更多個嵌段。構成共聚物之一或多個嵌段可獨立地選自例如直鏈嵌段、分支鏈嵌段、星形嵌段、樹枝狀嵌段以及其組合。通常,嵌段共聚物為直鏈共聚物,其中共聚物之各嵌段為直鏈嵌段。共聚物之嵌段可形成例如含有兩個或更多個不同單元、例如兩個、三個、四個或更多個不同單元之均聚物或共聚物。
嵌段共聚物由於抗蝕圖案化處理期間之脫除保護基而能夠例如藉由與存在於抗蝕圖案上之酸基及/或醇基鍵結而黏附至NTD形成之光阻圖案。嵌段共聚物具有第一嵌段,所述第一嵌段包括用於將嵌段共聚物連接至抗蝕圖案之經脫除保護基之基團之錨定基團。錨定組分包含包括含氮氫受體基團之單元。嵌段共聚物具有第二嵌段,所述第二嵌段直接或間接連接至第一嵌段以向嵌段共聚物添加額外長度,從而有效增加抗蝕圖案之尺寸。第二嵌段包含包括環狀脂族部分之單元。第二嵌段較佳有效提供具有低線寬粗糙度(LWR)之平滑表面。
第一嵌段之錨定基團側接至聚合物主鏈。第一嵌段之聚合物主鏈通常由具有烯系不飽和可聚合基團(較佳為乙烯基)之單體(例如(C1至C3烷基或鹵烷基)丙烯酸酯,諸如氟烷基丙烯酸酯,以及乙烯基吡啶)形成之單元製成。含有氫受體之基團與抗蝕圖案之表面處之經脫除保護基之酸基及/或醇基有效形成鍵,較佳為離子鍵或氫鍵。含有氫受體之基團為含氮基團。適合含氮基團可與抗蝕圖案表面處之酸基形成離子鍵。適合含氮基團包含例如一或多個選自以下之基團:胺,例如一級胺,例如N-甲基胺、N-乙基胺、1-胺基丙烷、2-胺基丙烷以及N-第三丁基胺,二級胺,例如二甲基胺、甲基乙基胺以及二乙基胺,以及三級胺,例如三甲胺;醯胺,例如烷基醯胺,例如N-甲基醯胺、N-乙基醯胺、N-苯基醯胺以及N,N-二甲基醯胺;亞胺,例如第一及第二醛亞胺及酮亞胺;二嗪,例如視情況經取代之吡嗪、哌嗪、吩嗪;二唑,例如視情況經取代之吡唑、噻二唑及咪唑;視情況經取代之
吡啶,例如吡啶、2-乙烯基吡啶及4-乙烯基吡啶;吡錠;視情況經取代之吡咯啶酮,例如2-吡咯啶酮、N-乙烯基吡咯啶酮及環己基吡咯啶;以及其組合。其中,較佳為胺、醯胺及乙烯基吡啶。含氮基團可視情況呈側接至聚合物主鏈之環形式,例如吡啶、吲哚、咪唑、三嗪、吡咯啶、氮雜環丙烷、氮雜環丁烷、哌啶、吡咯、嘌呤、二氮雜環丁烷、二噻嗪、氮雜環辛烷、氮雜環壬烷、喹啉、咔唑、吖啶、吲唑以及苯并咪唑。較佳地,出於空間原因,含氮基團在關於氮原子之α位置處具有少於三個、少於兩個或少於一個(亦即無)分支鏈碳。第一嵌段通常不含酸不穩定基團。
適於第一嵌段之單體單元包含例如甲基丙烯酸2-(N,N-二甲胺基)乙酯、甲基丙烯酸2-(N,N-二乙胺基)乙酯、甲基丙烯酸2-(第三丁胺基)乙酯、丙烯酸2-N-嗎啉基乙酯、甲基丙烯酸2-N-嗎啉基乙酯、丙烯酸3-二甲胺基新戊酯、N-(t-BOC-胺基丙基)甲基丙烯醯胺、N-[2-(N,N-二甲胺基)乙基]甲基丙烯醯胺、N-[3-(N,N-二甲胺基)丙基]丙烯醯胺、N-[3-(N,N-二甲胺基)丙基]甲基丙烯醯胺、2-乙烯基吡啶、4-乙烯基吡啶、N-(3-胺基丙基)甲基丙烯醯胺、甲基丙烯酸2-胺基乙酯、2-(二甲胺基)苯乙烯、哌啶-1-甲基丙烯酸4-N-第三丁氧羰基酯、4-(二甲胺基)苯乙烯以及N-乙烯基吡咯啶酮。
第二嵌段包含包括環狀脂族部分之單元。適合之環狀脂族部分包含單環及多環結構。多環結構可為例如稠合、橋連或繫留結構,且可為飽和或不飽和的。適合之環狀脂族部分包含例如視情況經取代之C3至C20環狀部分,例如選自視情況經取代之環丙基、環戊基、環己基、金剛烷基、
2-甲基-2-金剛烷基、降冰片基、冰片基、異冰片基、三環癸基、二環戊烯基、降冰片烷環氧基、薄荷基、異薄荷基、新薄荷基及四環十二烷基之部分。其中,視情況經取代之環己基、金剛烷基及降冰片基較佳。
適用於形成含有環狀脂族部分之第二嵌段的適合之單體包含例如以下:
適用於嵌段共聚物之第二嵌段包含例如上述單體之均聚物。包含一或多個由如上文所述之單體形成之單元之隨機及嵌段共聚物亦適合,例如選自以下之共聚物:
嵌段共聚物中可視情況包含一或多個額外嵌段。額外嵌段可包含一或多個關於第一及第二嵌段所述類型之額外嵌段,及/或可包含其他類型之嵌段。可使用額外嵌段例如修改嵌段共聚物之特徵,諸如收縮(圖案生長)量、抗蝕刻性、溶解度、Tg以及在顯影劑中之溶解速率中之一或多者。額外嵌段較佳由如上文關於第一及第二嵌段所述之具有烯系不飽和可聚合基團(例如乙烯基)之單體形成。若存在,則額外嵌段通常鍵結於第二嵌段。
在一個較佳態樣中,含有芳族部分之額外嵌段可包含於嵌段共聚物中。包含芳族部分可有益於例如增強嵌段共聚物之耐蝕刻性及/或溶解度特性。含有適合之芳族部分之嵌段包含例如由以下具有烯系不飽和雙鍵之單體中之一或多個視情況與一或多種額外單體形成之彼等嵌段:
藉由選擇適合嵌段共聚物,可以精確控制聚合物在抗蝕圖案側壁上之生長量。此厚度可以例如藉由選擇第一、第二及視情況選用之額外嵌段之適合分子量來控制,較高分子量通常導致較大厚度且較低分子量通常導致較小厚度。嵌段共聚物之化學組成亦可影響生長量。舉例而言,具有較長無擾末端距(unperturbed end-to-end distance)或特徵比之聚合物針對給定分子量提供較大收縮。
嵌段共聚物應在用於組合物中之有機溶劑及用於自基板沖洗及移除過量聚合物(亦即未附接至抗蝕圖案之聚合物)之有機溶劑中具有良好溶解度。抗蝕劑處理組合物中嵌段共聚物之含量將取決於例如抗蝕劑處理組合物之所需塗佈厚度。嵌段共聚物通常以組合物之總固體計以80至99重量%,更通常90至99重量%之量存在於組合物中。聚合物之重量平均分子量通常小於400,000,較佳為5000至
200,000,更佳為1000至125,000g/mol。
聚合物較佳具有良好抗蝕刻性以促進圖案轉移。對於基於碳之聚合物,「大西參數(Ohnishi parameter)」一般可以用作聚合物之抗蝕刻性之指標(《電化學學會志(J.Electrochem Soc)》,143,130(1983),H.Gokan、S.Esho及Y.Ohnishi)。大西參數一般用於指示聚合物之碳密度且藉由以下等式專門測定:N/(NC-NO)=大西參數
其中N為碳原子、氫原子及氧原子之組合總數,NC為碳原子數目,且NO為氧原子數目。每單位體積之聚合物之碳密度之增加(亦即大西參數之減小)可改良其抗蝕刻性。適用於本發明之基於碳之聚合物之大西參數通常小於4.5,較佳小於4且更佳小於3.5。
適用於本發明之組合物之適合嵌段共聚物包含例如以下:
圖案處理組合物通常包含單個嵌段共聚物,但可視情況包含一或多個如上文所述之額外嵌段共聚物及/或其他聚合物。用於圖案處理組合物中之適合嵌段共聚物可商購及/或熟習此項技術者容易製得。嵌段共聚物在與圖案處理組合物之其他組分組合之前可進行純化以移除金屬及/或非金屬雜質。純化可關於例如以下中之一或多者:洗滌、漿化、離心、過濾、蒸餾、傾析、蒸發以及用離子交換珠粒處理。
圖案處理組合物進一步包含有機溶劑,其可呈單種有機溶劑或有機溶劑混合物之形式。調配及澆鑄圖案處理組合物之適合溶劑材料呈現相對於組合物之非溶劑組分之極佳溶解度特徵,但不明顯地溶解底層光阻圖案。用於圖案處
理組合物之適合有機溶劑包含例如:烷基酯,諸如乙酸正丁酯、丙酸正丁酯、丙酸正戊酯、丙酸正己酯以及丙酸正庚酯,及丁酸烷基酯,諸如丁酸正丁酯、丁酸異丁酯以及異丁酸異丁酯;酮,諸如2-庚酮、2,6-二甲基-4-庚酮及2,5-二甲基-4-己酮;脂族烴,諸如正庚烷、正壬烷、正辛烷、正癸烷、2-甲基庚烷、3-甲基庚烷、3,3-二甲基己烷以及2,3,4-三甲基戊烷,及氟化脂族烴,諸如全氟庚烷;以及醇,例如直鏈、分支鏈或環狀C4-C9一元醇,諸如1-丁醇、2-丁醇、3-甲基-1-丁醇、異丁醇、第三丁醇、1-戊醇、2-戊醇、1-己醇、1-庚醇、1-辛醇、2-己醇、2-庚醇、2-辛醇、3-己醇、3-庚醇、3-辛醇以及4-辛醇;2,2,3,3,4,4-六氟-1-丁醇、2,2,3,3,4,4,5,5-八氟-1-戊醇以及2,2,3,3,4,4,5,5,6,6-十氟-1-己醇,以及C5-C9氟化二醇,諸如2,2,3,3,4,4-六氟-1,5-戊二醇、2,2,3,3,4,4,5,5-八氟-1,6-己二醇以及2,2,3,3,4,4,5,5,6,6,7,7-十二氟-1,8-辛二醇;甲苯、苯甲醚以及含有此等溶劑中之一或多者之混合物。在此等有機溶劑中,丙酸烷基酯、丁酸烷基酯及酮,較佳分支鏈酮為較佳的,且更佳為丙酸C8-C9烷基酯、丙酸C8-C9烷基酯、C8-C9酮以及含有此等溶劑中之一或多者之混合物。適合混合溶劑包含例如烷基酮及丙酸烷基酯,例如上文所述之烷基酮及丙酸烷基酯之混合物。組合物之溶劑組分通常以總組合物計90至99重量%之量存在。
圖案處理組合物可包含一或多種視情況選用之添加劑,包含例如界面活性劑及抗氧化劑。此類視情況選用之添加劑若使用,則各自通常以例如以組合物之總固體計0.01重量%至10重量%之微量存在於組合物中。
典型界面活性劑包含呈現兩親性之界面活性劑,意謂其可同時具有親水性及疏水性。兩親性界面活性劑具有一或多個對水有較強親和力之親水性頭基,以及親有機物質且排斥水之長疏水性尾。適合界面活性劑可以為離子性(即陰離子性、陽離子性)或非離子性。界面活性劑之其他實例包含矽酮界面活性劑、聚(環氧烷)界面活性劑及含氟界面活性劑。適合非離子性界面活性劑包含(但不限於)辛基苯酚及壬基苯酚乙氧基化物,例如TRITON® X-114、X-100、X-45、X-15,以及分支鏈二級醇乙氧基化物,例如TERGITOLTM TMN-6(The Dow Chemical Company,Midland,Michigan USA)。其他例示性界面活性劑包含醇(一級醇及二級醇)乙氧基化物、胺乙氧基化物、葡糖苷、還原葡糖胺、聚乙二醇、聚(乙二醇-共-丙二醇),或由新澤西州格倫洛克(Glen Rock,N.J.)之Manufacturers Confectioners Publishing Co.於2000年出版之北美版《麥卡琴乳化劑及清潔劑(McCutcheon's Emulsifiers and Detergents)》中所公開之其他界面活性劑。炔系二醇衍生物類非離子性界面活性劑亦為適合的。此類界面活性劑可自賓夕法尼亞州艾倫鎮(Allentown,PA)之Air Products and Chemicals,Inc.購得且以商品名SURFYNOL及DYNOL出售。額外適合界面活性劑包含其他聚合化合物,例如三嵌段EO-PO-EO共聚物PLURONIC 25R2、L121、L123、L31、L81、L101及P123(BASF,Inc.)。
可添加抗氧化劑以防止圖案處理組合物中之有機材料氧化或將其氧化減至最少。適合抗氧化劑包含例如基於酚之抗氧化劑、由有機酸衍生物構成之抗氧化劑、含硫抗
氧化劑、基於磷之抗氧化劑、基於胺之抗氧化劑、由胺-醛縮合物構成之抗氧化劑以及由胺-酮縮合物構成之抗氧化劑。基於酚之抗氧化劑之實例包含經取代之酚,例如1-氧基-3-甲基-4-異丙基苯、2,6-二第三丁基苯酚、2,6-二第三丁基-4-乙基苯酚、2,6-二第三丁基-4-甲基苯酚、4-羥甲基-2,6-二第三丁基苯酚、丁基˙羥基苯甲醚、2-(1-甲基環己基)-4,6-二甲基苯酚、2,4-二甲基-6-第三丁基苯酚、2-甲基-4,6-二壬基苯酚、2,6-二第三丁基-α-二甲胺基-對甲酚、6-(4-羥基-3,5-二第三丁基˙苯胺基)2,4-雙˙辛基-硫基-1,3,5-三嗪、正十八烷基-3-(4'-羥基-3',5'-二第三丁基˙苯基)丙酸酯、辛基酚、經芳烷基取代之苯酚、烷基化對甲酚及受阻酚;雙酚、三酚及多酚,例如4,4'-二羥基˙聯苯、亞甲基˙雙(二甲基-4,6-苯酚)、2,2'-亞甲基-雙-(4-甲基-6-第三丁基苯酚)、2,2'-亞甲基-雙-(4-甲基-6-環己基˙苯酚)、2,2'-亞甲基-雙-(4-乙基-6-第三丁基苯酚)、4,4'-亞甲基-雙-(2,6-二第三丁基苯酚)、2,2'-亞甲基-雙-(6-α-甲基-苯甲基-對甲酚)、亞甲基交聯之多價烷基酚、4,4'-亞丁基雙-(3-甲基-6-第三丁基苯酚)、1,1-雙-(4-羥苯基)-環己烷、2,2'-二羥基-3,3'-二-(α-甲基環己基)-5,5'-二甲基˙二苯基甲烷、烷基化雙酚、受阻雙酚、1,3,5-三甲基-2,4,6-三(3,5-二第三丁基-4-羥基苯甲基)苯、三-(2-甲基-4-羥基-5-第三丁基苯基)丁烷及四-[亞甲基-3-(3',5'-二第三丁基-4'-羥苯基)丙酸酯]甲烷。適合抗氧化劑可商購,例如IrganoxTM抗氧化劑(Ciba Specialty Chemicals Corp.)。
圖案處理組合物較佳不含諸如通常用於酸擴散抗蝕劑生長製程之交聯劑。已知此等方法面臨接近性及尺寸
偏差,其中例如分離孔收縮大於緻密孔,其由剩餘光阻中之酸濃度所致。除不含交聯劑以外,圖案處理組合物較佳不含酸、酸產生劑化合物,例如熱酸產生劑化合物及光酸產生劑化合物,因為此類化合物可藉由與具有組合物之錨定官能基之抗蝕劑之酸/醇競爭來限制組合物可達至之溝槽/孔收縮量。
圖案處理組合物可遵循已知程序製備。舉例而言,組合物可藉由將嵌段共聚物及組合物之其他視情況選用之固體組分溶解於溶劑組分中來製備。組合物之所需總固體含量將取決於諸如組合物中之特定聚合物及所需最終層厚度之因素。較佳地,圖案處理組合物之固體含量以組合物之總重量計為1至10重量%,更佳為1至5重量%。
適用於本發明之光阻組合物包含包括酸敏感之基質樹脂之化學放大光阻組合物,意謂作為光阻組合物之層之一部分,樹脂及組合物層經歷有機顯影劑之溶解度變化,此為由與由光酸產生劑在軟烘烤、暴露於活化輻射及曝光後烘烤之後產生之酸之反應所致。可溶性之變化為在基質聚合物中之酸可裂解離去基(如光酸不穩定酯或縮醛基)在暴露於活化輻射及熱處理時經歷光酸促進去保護反應以產生酸或醇基時引起。適用於本發明之適合光阻組合物為可商購的。
對於在某些次200nm波長(諸如193nm)下成像,基質聚合物典型地實質上不含(例如小於15莫耳%)或完全不含苯基、苯甲基或其他芳族基,其中此類基團可高度吸收輻射。較佳酸不穩定基團包含例如含有共價連接至基質聚合物之酯之羧基氧之第三非環烷基碳(例如第三丁基)或
第三脂環族碳(例如甲基金剛烷基)之縮醛基或酯基。適合基質聚合物進一步包含聚合物,其含有(烷基)丙烯酸酯單元,較佳包含酸不穩定(烷基)丙烯酸酯單元,諸如丙烯酸第三丁酯、甲基丙烯酸第三丁酯、丙烯酸甲基金剛烷基酯、甲基丙烯酸甲基金剛烷基酯、丙烯酸乙基對酯、甲基丙烯酸乙基對酯及其類似物,及其他非環狀烷基及脂環族(烷基)丙烯酸酯。其他適合基質聚合物包含例如含有非芳族環烯烴(內環雙鍵),如視情況經取代之降冰片烯之聚合單元之基質聚合物。上述基質聚合物中之兩種或更多種之摻合物可適當地用於光阻組合物中。
用於光阻組合物中之適合基質聚合物為可商購的且可以由熟習此項技術者容易地製得。基質聚合物以足以使得抗蝕劑之曝光塗層在適合之顯影劑溶液中可顯影之量存在於抗蝕劑組合物中。通常,基質聚合物以抗蝕劑組合物之總固體計50至95重量%之量存在於組合物中。基質聚合物之重均分子量Mw典型地小於100,000,例如為5000至100,000,更典型地為5000至15,000。
光阻組合物進一步包括以足以在暴露於活化輻射時產生組合物之塗層中之潛像之量使用之光酸產生劑(PAG)。舉例而言,光酸產生劑將適當地以光阻組合物之總固體計約1至20重量%之量存在。典型地,相比於非化學放大材料,較少量之PAG將適合於化學放大抗蝕劑。
適合PAG為化學放大光阻領域中已知的且包含例如:鎓鹽,例如三氟甲烷磺酸三苯基鋶、三氟甲烷磺酸(對第三丁氧基苯基)二苯基鋶、三氟甲烷磺酸三(對第三丁氧基苯
基)鋶、對甲苯磺酸三苯基鋶;硝基苯甲基衍生物,例如2-硝基苯甲基-對甲苯磺酸鹽、2,6-二硝基苯甲基-對甲苯磺酸鹽及2,4-二硝基苯甲基-對甲苯磺酸鹽;磺酸酯,例如1,2,3-三(甲烷磺醯基氧基)苯、1,2,3-三(三氟甲烷磺醯基氧基)苯及1,2,3-三(對甲苯磺醯基氧基)苯;重氮甲烷衍生物,例如雙(苯磺醯基)重氮甲烷、雙(對甲苯磺醯基)重氮甲烷;乙二肟衍生物,諸如雙-O-(對甲苯磺醯基)-α-二甲基乙二肟及雙-O-(正丁烷磺醯基)-α-二甲基乙二肟;N-羥基醯亞胺化合物之磺酸酯衍生物,例如N-羥基丁二醯亞胺甲磺酸酯、N-羥基丁二醯亞胺三氟甲磺酸酯;以及含鹵素之三嗪化合物,例如2-(4-甲氧基苯基)-4,6-雙(三氯甲基)-1,3,5-三嗪以及2-(4-甲氧基萘基)-4,6-雙(三氯甲基)-1,3,5-三嗪。可使用此類PAG中之一或多者。
用於光阻組合物之適合溶劑包含例如:二醇醚,諸如2-甲氧基乙基醚(二乙二醇二甲醚)、乙二醇單甲醚及丙二醇單甲醚;丙二醇單甲基醚乙酸酯;乳酸酯,諸如乳酸甲酯及乳酸乙酯;丙酸酯,諸如丙酸甲酯、丙酸乙酯、乙氧基丙酸乙酯以及甲基-2-羥基異丁酸酯;溶纖劑酯,諸如溶纖劑乙酸甲酯;芳族烴,諸如甲苯及二甲苯;以及酮,諸如丙酮、甲基乙基酮、環己酮以及2-庚酮。溶劑之摻合物,如上文所述之溶劑中之兩種、三種或更多種之摻合物亦為合適的。溶劑典型地以光阻組合物之總重量計90至99重量%,更典型地95至98重量%之量存在於組合物中。
光阻組合物可以進一步包含其他視情況選用之材料。舉例而言,組合物可包含光化染料及對比染料、抗條紋劑、塑化劑、增速劑、敏化劑及其類似物中之一或多種。
此類視情況選用之添加劑若使用,則通常以微量,如以光阻組合物之總固體計0.1至10重量%之量存在於組合物中。
抗蝕劑組合物之較佳視情況選用之添加劑為添加之鹼。適合鹼包含例如:直鏈及環狀醯胺及其衍生物,諸如N,N-雙(2-羥乙基)棕櫚醯胺、N,N-二乙基乙醯胺、N1,N1,N3,N3-四丁基丙二醯胺、1-甲基氮雜環庚烷-2-酮、1-烯丙基氮雜環庚烷-2-酮以及1,3-二羥基-2-(羥甲基)丙-2-基胺基甲酸第三丁酯;芳族胺,諸如吡啶及二第三丁基吡啶;脂族胺,諸如三異丙醇胺、正第三丁基二乙醇胺、三(2-乙醯氧基-乙基)胺、2,2',2",2'''-(乙烷-1,2-二基雙(氮烷三基))四乙醇及2-(二丁基胺基)乙醇、2,2',2"-氮基三乙醇;環狀脂族胺,諸如1-(第三丁氧基羰基)-4-羥基哌啶、1-吡咯啶甲酸第三丁酯、2-乙基-1H-咪唑-1-甲酸第三丁酯、哌嗪-1,4-二甲酸二第三丁酯以及N(2-乙醯氧基-乙基)嗎啉。添加之鹼典型地以相對較小量,例如以光阻組合物之總固體計0.01至5重量%,較佳0.1至2重量%使用。
光阻可遵照已知程序製備。舉例而言,抗蝕劑可藉由將光阻之組分溶解於合適之溶劑,例如以下各者中之一或多種中而以塗層組合物形式製備:二醇醚,諸如2-甲氧基乙基醚(二乙二醇二甲醚)、乙二醇單甲醚、丙二醇單甲醚;丙二醇單甲基醚乙酸酯;乳酸酯,諸如乳酸乙酯或乳酸甲酯,其中乳酸乙酯為較佳的;丙酸酯,確切地說丙酸甲酯、丙酸乙酯及乙氧基丙酸乙酯;溶纖劑酯,諸如溶纖劑乙酸甲酯;芳族烴,諸如甲苯或二甲苯;或酮,諸如甲基乙基酮、環己酮及2-庚酮。光阻之所需總固體含量將取決於諸如組合物中
之特定聚合物、最終層厚度及曝光波長之因素。通常,光阻之固體含量在以光阻組合物之總重量計之1至10重量%,更通常2至5重量%之範圍內變化。
適合NTD光阻為此項技術中已知的且包含例如美國專利公開案US20130115559A1、US20110294069A1、US20120064456A1、US20120288794A1、US20120171617A1、US20120219902A1以及US7998655B2中描述之光阻。
現將參考圖1A-F描述根據本發明之方法,所述圖式說明藉由負型顯影形成光微影圖案之例示性方法流程。
圖1A以橫截面描繪可包含各種層及特徵之基板100。所述基板可由諸如半導體(如矽或化合物半導體(例如III-V或II-VI))、玻璃、石英、陶瓷、銅之材料製成。通常,基板為半導體晶片,如單晶矽或化合物半導體晶片,且可具有形成於其表面上之一或多個層及圖案化特徵。一或多個待圖案化之層102可提供於基板100上。視情況地,下伏基底基板材料本身可經圖案化,例如,當需要在基板材料中形成槽時。在對基底基板材料本身進行圖案化之情況下,圖案應視為形成於基板之層中。
層可包含例如一或多個導電層,例如鋁、銅、鉬、鉭、鈦、鎢、合金、此類金屬之氮化物或矽化物、摻雜非晶矽或摻雜多晶矽之層,一或多個介電層,例如氧化矽、氮化矽、氮氧化矽或金屬氧化物之層,半導體層,例如單晶矽,以及其組合。待蝕刻之層可藉由各種技術形成,例如化學氣相沈積(CVD),如電漿增強CVD、低壓CVD或外延生長,
物理氣相沈積(PVD),如濺鍍或蒸發,或電鍍。待蝕刻之一或多個層102之特定厚度將視材料及形成之特定裝置而變化。
取決於待蝕刻之特定層、膜厚度及待使用之光微影材料及方法,可能需要在層102上安置硬遮罩層及/或底部抗反射塗層(BARC),在其上塗佈光阻層104。例如在極薄抗蝕劑層之情況下可能需要使用硬遮罩層,其中待蝕刻之層需要顯著蝕刻深度,及/或其中特定蝕刻劑之抗蝕劑選擇性差。當使用硬遮罩層時,待形成之抗蝕圖案可轉移至硬遮罩層,其又可用作蝕刻下伏層102之遮罩。適合之硬遮罩材料及形成方法在此項技術中已知。典型材料包含例如鎢、鈦、氮化鈦、氧化鈦、氧化鋯、氧化鋁、氮氧化鋁、氧化鉿、非晶碳、氮氧化矽及氮化矽。硬遮罩層可包含單個層或不同材料之多個層。硬遮罩層可例如藉由化學或物理氣相沈積技術形成。
當基板及/或下伏層將在光阻曝光期間另外反射大量入射輻射,使得形成之圖案之品質將受不利影響時,底部抗反射塗層可為合意的。此類塗層可改良聚焦深度、曝光寬容度、線寬均勻性及CD控制。當抗蝕劑曝露於深紫外光(300nm或更小),例如KrF準分子雷射(248nm)或ArF準分子雷射(193nm)時,通常使用抗反射塗層。抗反射塗層可包括單個層或多個不同層。適合之抗反射材料及形成方法為此項技術中已知的。抗反射材料為可商購的,例如由Dow Electronic Materials(Marlborough,MA USA)以ARTM商標出售之材料,如ARTM40A及ARTM124抗反射劑材料。
由如本文所述之組合物形成之光阻層104在抗反射層(若存在)上方安置於基板上。光阻組合物可藉由旋塗、
浸漬、輥塗或其他習知塗佈技術塗覆至基板。在此等技術中,旋塗為典型的。對於旋塗,塗料溶液之固體含量可基於所採用之特定塗佈設備、溶液之黏度、塗佈工具之速度以及允許旋轉之時間量進行調節來提供所需之膜厚度。光阻層104之典型厚度為約500至3000Å。
光阻層可隨後經軟烘烤以使層中之溶劑含量降至最低,由此形成無黏性塗層且改良層與基板之黏著。軟烘烤可在加熱板上或烘箱中進行,其中加熱板為典型的。軟烘烤溫度及時間將取決於例如光阻之特定材料及厚度。典型軟烘烤在約90至150℃之溫度下進行,且時間為約30至90秒。
光阻層104隨後藉由圖案化光遮罩108暴露於活化輻射106,以在曝光區域與未曝光區域之間產生可溶性差異。本文中提及將光阻組合物暴露於使組合物活化之輻射表明輻射能夠在光阻組合物中形成潛像。光遮罩具有對應於抗蝕劑層中在後續顯影步驟中分別保留及移除之區域之光學透明區及光學不透明區。曝光波長通常低於400nm、低於300nm或低於200nm,其中248nm、193nm及EUV波長(例如13.5nm)為典型的。所述方法應用於浸沒或乾式(非浸沒)光微影技術。曝光能量通常為約10至80mJ/cm2,其取決於曝光工具及光阻組合物之組分。
在光阻層104曝光後,進行曝光後烘烤(PEB)。由酸產生劑產生之酸引起酸可裂解離去基之裂解以形成酸基,通常為羧酸基及/或醇基。PEB可例如在加熱板上或烘箱中進行。PEB之條件將取決於例如特定光阻組合物及層厚度。PEB通常在約80至150℃之溫度下進行,且時間為約30
至90秒。
經曝光之光阻層隨後經顯影以移除未曝光之區域,使曝光區域形成如圖1B中所示之負型抗蝕劑圖案104'。抗蝕劑圖案104'包括羧酸基及/或醇基。負型顯影劑為有機溶劑顯影劑,例如選自酮、酯、醚、烴及其混合物之溶劑。適合之酮溶劑包含例如丙酮、2-己酮、5-甲基-2-己酮、2-庚酮、4-庚酮、1-辛酮、2-辛酮、1-壬酮、2-壬酮、二異丁基酮、環己酮、甲基環己酮、苯基丙酮、甲基乙基酮及甲基異丁基酮。適合之酯溶劑包含例如乙酸甲酯、乙酸丁酯、乙酸乙酯、乙酸異丙酯、乙酸戊酯、丙二醇單甲醚乙酸酯、乙二醇單乙醚乙酸酯、二乙二醇單丁醚乙酸酯、二乙二醇單乙醚乙酸酯、乙基-3-乙氧基丙酸酯、乙酸3-甲氧基丁酯、乙酸3-甲基-3-甲氧基丁酯、甲酸甲酯、甲酸乙酯、甲酸丁酯、甲酸丙酯、乳酸乙酯、乳酸丁酯以及乳酸丙酯。適合之醚溶劑包含例如二噁烷、四氫呋喃及二醇醚溶劑,例如乙二醇單甲醚、丙二醇單甲醚、乙二醇單乙醚、丙二醇單乙醚、二乙二醇單甲醚、三乙二醇單乙醚及甲氧基甲基丁醇。適合之醯胺溶劑包含例如N-甲基-2-吡咯啶酮、N,N-二甲基乙醯胺及N,N-二甲基甲醯胺。適合之烴溶劑包含例如芳族烴溶劑,如甲苯、苯甲醚及二甲苯。另外,可使用此等溶劑之混合物,或與除上文所述之彼等以外之溶劑混合或與水混合之所列溶劑中之一或多種。其他適合之溶劑包含用於光阻組合物中之溶劑。顯影劑較佳為2-庚酮或乙酸丁酯,如乙酸正丁酯。
有機溶劑通常以顯影劑之總重量計90重量%至100重量%,更通常大於95重量%、大於98重量%、大於99
重量%或100重量%之組合量存在於顯影劑中。
顯影劑材料可包含視情況選用之添加劑,例如界面活性劑,如上文關於光阻所述。此類視情況選用之添加劑典型地將以較小濃度,例如以顯影劑之總重量計約0.01至5重量%之量存在。
顯影劑可以藉由已知技術,例如藉由旋塗或覆液塗覆(puddle-coating)而塗覆於基板。顯影時間為可有效移除光阻之未曝光區域之時段,其中5至30秒之時間為典型的。顯影典型地在室溫下進行。
在顯影後,抗蝕劑圖案104'可視情況在硬烘烤方法中經熱處理,以自抗蝕劑圖案進一步移除溶劑。視情況選用之硬烘烤通常用加熱板或烘箱進行,且通常在約90℃或更高,例如約100至150℃之溫度下進行,且時間為約30至120秒。
參考圖1C,在抗蝕劑圖案104'上塗佈如本文所描述之圖案處理組合物,以形成圖案處理組合物層112。視特定過程而定,取決於特定應用,可施用圖案處理組合物以完全覆蓋抗蝕劑圖案,或達到小於或等於抗蝕劑圖案之厚度之高度,以覆蓋抗蝕劑圖案頂部表面。
隨後,圖案處理組合物層112通常經軟烘烤以自組合物移除溶劑且引起聚合物擴散及誘導聚合物之錨定部分與光阻圖案之去保護酸及/或醇基之間之結合。圖案處理組合物之典型軟烘烤在約90至150℃之溫度下進行,且時間為約30至120秒。
包含未結合於抗蝕劑圖案之聚合物之殘餘處理
組合物隨後藉由沖洗自基板移除,留下結合於抗蝕劑圖案之聚合物層112',如圖1D中所示。藉由移除殘餘圖案處理組合物,抗蝕劑圖案側壁之有效厚度增加,從而減小相鄰刻線之間或溝槽或穿孔圖案內之間距。適合之沖洗溶液包含有機溶劑顯影劑,其中聚合物為可溶的。適合之材料包含例如本文中關於NTD顯影劑所描述之顯影劑。在此等顯影劑中,乙酸正丁酯及2-庚酮為典型的。與在光阻層之顯影之後之抗蝕劑圖案相比,所得影像通常具有改良之(即降低之)表面粗糙度。
視情況地,可在高於嵌段共聚物之Tg之溫度下進行沖洗後烘烤。此烘烤可提供有益結果,例如呈由聚合物之熱力學驅動所引起之改良之圖案粗糙度或圓度以使其與空氣之界面面積最小化之形式。
可隨後使用抗蝕劑圖案104'選擇性地蝕刻一或多個下伏層102,其中經結合之嵌段共聚物112'作為蝕刻遮罩以使下伏基板100曝光,如圖1E中所示。用於蝕刻層102之適合之蝕刻技術及化學反應為此項技術中已知的,其中乾式蝕刻方法,如反應性離子蝕刻為典型的。隨後使用已知技術,例如氧電漿灰化,自基板移除抗蝕劑圖案104'及所結合之嵌段共聚物112'。
以下非限制性實例說明本發明。
在配備有折射率偵測器之沃特斯聯盟系統(Waters alliance system)上,藉由凝膠滲透層析法(GPC)量測不含氮嵌段聚合物之數目及重量平均分子量Mn及Mw以及
多分散性(PDI)值(Mw/Mn)。樣品以約1mg/mL之濃度溶解於HPCL級THF中,且藉由四個昭及(Shodex)管柱(KF805、KF804、KF803及KF802)注射。保持1mL/min之流動速率及35℃之溫度。管柱用窄分子量PS標準(EasiCal PS-2,Polymer Laboratories,Inc.)進行校準。對於最終嵌段共聚物上之含氮嵌段,基於反應物饋料電荷計算數目平均分子量Mn且報導為「Mn Target」。
使用Hitachi S9380 SEM在250K放大率下獲得自上向下之掃描電子顯微照片。在對晶片切片之後使用Amray 1910掃描電子顯微鏡獲得橫截面SEM影像。基於SEM影像測定臨界尺寸(CD)及間距。
光阻組合物B製備方法
混合17.73g基質聚合物A(15重量%於PGMEA中)、16.312g PAG A溶液(1重量%於甲基-2-羥基異丁酸酯中)、3.463g PAG B溶液(1重量%於PGMEA中)、6.986g PAG C溶液(2重量%於甲基-2-羥基異丁酸酯中)、4.185g三辛胺(於PGMEA中之1重量%溶液)、0.248g聚合物添加劑A(於PGMEA中之25重量%溶液)、25.63g PGMEA、9.69g γ-丁內酯及22.61g甲基-2-羥基異丁酸鹽且藉由0.2μm Nylon過濾器過濾。
圖案處理組合物製備方法
如下文所述,使用以下單體製備圖案處理組合物聚合物P-1至P-14。
反應物聚合物合成
實例1:
將0.019g二甲基2,2'-偶氮雙(2-甲基丙酸酯)(DMAMP)、10g單體M4、15g單體M10、0.114g苯并二硫
2-氰基丙-2-酯(CPBD)、32mL PGMEA及磁性攪拌棒裝載至200mL無空氣燒瓶中。用液氮將混合物冷凍-泵送-解凍三次且隨後將燒瓶放置於70℃下之加熱塊中16小時。反應後,冷卻燒瓶。隨後使反應混合物沈澱於500mL甲醇中。收集沈澱物且再沈澱。收集聚合物且在真空烘箱中在50℃下乾燥隔夜。所得聚合物PP-1具有36k(kg/mol)之Mn及1.15之PDI。
實例2-6:
聚合物PP-2至PP-6使用如上文針對聚合物PP-1所描述類似之程序合成,其中材料及量展示於表1中。將「單體A」及「單體B」同時饋入至反應器中。
嵌段共聚物合成
實例7:
將10g聚合物PP-1、2g單體M13、0.007g二甲基2,2'-偶氮雙(2-甲基丙酸酯)(DMAMP)、25.44mL二噁烷及磁性攪拌棒裝載至200mL無空氣反應器中。用液氮將混合物冷凍-泵送-解凍三次。反應器隨後用隔片密封且在70℃
下放置於加熱塊中16小時。反應後,冷卻燒瓶。隨後使反應混合物沈澱於500mL甲醇中。收集沈澱物且再沈澱。收集所得聚合物P-1且在真空烘箱中在室溫下乾燥隔夜。
實例9-13:聚合物P-2至P-6使用如上文針對聚合物P-1所描述類似之程序合成,其中材料及量展示於表2中。
實例14:將0.043g二甲基2,2'-偶氮雙(2-甲基丙酸酯)、10.0g單體M5(甲基丙烯酸第三丁酯)、0.341g苯并二硫2-氰基丙-2-酯(CPBD)、17.5g PGMEA及磁性攪拌棒裝載至200mL無空氣燒瓶中。用液氮將混合物冷凍-泵送-解凍三次且隨後將燒瓶放置於70℃下之加熱塊中16小時。反應後,冷卻燒瓶且隨後使反應混合物沈澱於500mL甲醇中。收集沈澱物且再沈澱。收集聚合物且在真空烘箱中在50℃下乾燥隔夜。所得聚合物[聚(第三甲基丙烯酸丁酯)]具有5.0k之Mn及1.17之PDI。
將2.0g所得聚合物、13.3g單體M1(甲基丙烯酸金剛烷酯)、0.014g二甲基2,2'-偶氮雙(2-甲基丙酸酯)、15.5g PGMEA及磁性攪拌棒裝載至200mL無空氣反應器中。用
液氮將混合物冷凍-泵送-解凍三次且隨後將燒瓶放置於70℃下之加熱塊中16小時。反應後,冷卻燒瓶。隨後將反應混合物沈澱於500mL甲醇中,且收集沈澱物且再沈澱。收集聚合物且在真空烘箱中在50℃下乾燥隔夜。所得聚合物[聚(第三甲基丙烯酸丁酯)-b-聚(甲基丙烯酸金剛烷酯)]具有18k之Mn及1.22之PDI。
將7.0g所得聚合物、2.1g單體M13(甲基丙烯酸二甲基胺基甲酯)、0.008g二甲基2,2'-偶氮雙(2-甲基丙酸酯)、26.72g PGMEA及磁性攪拌棒裝載至200mL無空氣反應器中。用液氮將混合物冷凍-泵送-解凍三次且隨後將燒瓶放置於70℃下之加熱塊中16小時。反應後,冷卻燒瓶且使反應混合物沈澱於500mL甲醇中。收集沈澱物且再沈澱。收集聚合物且在真空烘箱中在50℃下乾燥隔夜。對於含氮嵌段,所得聚合物P-7具有5k之目標Mn。
實例15及16:
使用表3中闡述之材料及量合成聚合物P-8及P-9。將單體及溶劑冷凍-泵送-解凍三次以移除氧。單體在與經活化之Al2O3一起使用之前經進一步純化,且用環己烷稀釋至約50體積%濃度。將約7-10重量%固體之反應濃度所需之量之THF轉移至含有預先乾燥之LiCl之反應器中。內含物在乾冰/異丙醇浴中冷卻至-78℃。THF用含第二丁基鋰(SBL)引發劑之0.7M環己烷滴定直至觀測到綠色。使反應浴升溫至室溫直至綠色完全消失。反應浴再冷卻至-78℃,接著添加二苯基乙烯(DPE)及SBL引發劑以產生亮紅色。將第一及第二單體(「單體A」及「單體B」)供應至反應器中且攪拌內
含物六小時。藉由在含聚合物混合物之無氧甲醇中插入導管來收集反應物等分試樣。針對Mn,藉由GPC分析沈澱之聚合物。向反應器中添加第三單體(「單體C」)且在-78℃下攪拌混合物四小時。接著在無氧甲醇中淬滅反應物等分試樣。反應產物在甲醇中沈澱出來,以產生粉末狀白色沈澱物,其在烘箱中在50℃下真空乾燥八小時以產生乾燥聚合物作為聚合物P-8及P-9。
實例17-19:
使用表3中闡述之材料及量合成聚合物P-10至P-12。將單體及溶劑冷凍-泵送-解凍三次以移除氧。單體在與經活化之Al2O3一起使用之前經進一步純化,且用環己烷稀釋至約50體積%濃度。將約7-10重量%固體之反應濃度所需之量之THF轉移至含有預先乾燥之LiCl之反應器中。內含物在乾冰/異丙醇浴中冷卻至-78℃。THF用含第二丁基鋰(SBL)引發劑之0.7M環己烷滴定直至觀測到綠色。使反應浴升溫至室溫直至綠色完全消失。反應浴再冷卻至-78℃,接著添加二苯基乙烯(DPE)及SBL引發劑以產生亮紅色。將第一單體(「單體A」)供應至反應器中且攪拌內含物四小時。藉由在含聚合物混合物之無氧甲醇中插入導管來收集反應物等分試樣。針對Mn,藉由GPC分析沈澱之聚合物。向反應器中添加第二單體(「單體B」)且在-78℃下攪拌混合物四小時。在無氧甲醇中收集反應物等分試樣。針對Mn,藉由GPC分析聚合物。向反應器中添加第三單體(「單體C」)且在-78℃下攪拌混合物四小時。接著在無氧甲醇中淬滅反應物等分試樣。反應產物在甲醇中沈澱出來,以產生粉末狀白色沈澱物,
其在烘箱中在50℃下真空乾燥八小時以產生乾燥聚合物作為聚合物P-10至P-12。
實例20(比較性):
將21g PGMEA裝入3頸部100ml圓底燒瓶中且在氮氣吹掃下加熱至90℃。17.1g單體M2及0.9g單體M13預先溶解於12.0g PGMEA中。0.9g V601引發劑(Wako Specialty Chemicals)溶解於8.0g PGMEA中。將單體及引發劑在兩小時時段內皆供應至反應器中。接著再維持內含物兩小時,接著使反應混合物冷卻至環境溫度。聚合物在甲醇中沈澱出來且在真空烘箱中在50℃下乾燥8小時,以提供聚合物P-13,其目標Mw為10k。
實例21(比較性):
500g THF在乾冰/異丙醇浴中冷卻至-78℃。THF用含第二丁基鋰(SBL)之0.7M環己烷滴定。使反應物批料升溫至室溫直至其綠色完全消失。反應浴再次冷卻至-78℃,接著添加0.17g二苯基乙烯(100%)及1.39g SBL(0.45M
於環己烷中)引發劑,從而產生亮紅色。將50.0g單體M2供應至反應器中且再攪拌內含物四小時。接著用無氧甲醇淬滅反應物。內含物在甲醇中沈澱出來,以產生粉末狀白色沈澱物。沈澱物在烘箱中在50℃下真空乾燥8小時,以提供聚合物P-14,其Mn為60k。
圖案處理組合物製備方法:
藉由在2-庚酮中以可形成3重量%溶液之量溶解表4中闡述之聚合物來製備圖案處理組合物。組合物用0.2微米超高分子量聚乙烯(UPE)過濾器過濾。
光微影加工:實例36-41:溝槽圖案之收縮
以如下方式製備及加工具有刻線/空間圖案之矽晶片。提供在1350Å有機底層上具有220Å含矽抗反射塗料(SiARC)層之雙層堆疊之八吋矽晶片。在雙層堆疊上塗佈表5中指定之光阻組合物且在TEL CLEAN TRACKTM LITHIUSTM i+塗佈器/顯影器上在90℃下軟烘烤60秒,達到1000Å之目
標抗蝕劑厚度。對每個晶片在多種劑量下使用ASML 1100掃描儀使光阻層曝光,所述掃描儀之數值孔徑(NA)為0.75且藉由包含刻線/空間圖案之光罩進行Dipole-35Y發光,所述刻線/空間圖案之間距為150nm。在90℃下進行曝光後烘烤60秒,且使用乙酸正丁酯(nBA)顯影劑使光阻層顯影,以跨越晶片形成具有150nm間距及各種關鍵尺寸(CD)之刻線/空間圖案。藉由SEM觀測一個抗蝕劑圖案化晶片作為未經進一步加工之對照物,且量測各刻線之間之平均間隔(CD i )。藉由在TEL CLEAN TRACKTM LITHIUSTM i+塗佈器/顯影器上,在1500rpm下旋塗來用表5中指定之各別圖案處理組合物外塗佈其他晶片。圖案化晶片在100℃下軟烘烤60秒,且在旋塗器上用乙酸正丁酯沖洗。藉由SEM觀測所得圖案且在圖案之中間高度處量測各刻線之間之平均間隔(CD f )。計算圖案處理組合物之平均收縮量△CD(=CD i -CD f )。結果展示於表5中。圖2提供圖案處理組合物PTC-11在圖案處理之前及之後之CD與曝光量之間的關係之代表曲線。所量測之範圍內各劑量下之收縮量(△CD)實質上恆定,表明本發明之圖案處理組合物之低鄰近偏差。
實例42-49:接觸孔圖案之收縮
以如下方式製備及加工具有接觸孔圖案之矽晶
片。提供在1350Å有機底層上具有220Å含矽抗反射塗料(SiARC)層之雙層堆疊之八吋矽晶片。在雙層堆疊上塗佈表6中指定之光阻組合物且在TEL CLEAN TRACKTM LITHIUSTM i+塗佈器/顯影器上在90℃下軟烘烤60秒,達到1000Å之目標抗蝕劑厚度。對每個晶片在多種劑量下使用ASML 1100掃描儀使光阻層曝光,所述掃描儀之數值孔徑(NA)為0.75且藉由包含接觸孔圖案之光罩進行Quadrapole 30發光,所述接觸孔圖案之間距為300nm。在90℃下進行曝光後烘烤60秒,且使用乙酸正丁酯(nBA)顯影劑使光阻層顯影,以跨越晶片形成具有300nm間距及各種關鍵尺寸(CD)之接觸孔圖案。藉由SEM觀測一個抗蝕劑圖案化晶片作為未經進一步加工之對照物,且在圖案之中間高度處量測平均接觸孔直徑(CD i )。藉由在TEL CLEAN TRACKTM LITHIUSTM i+塗佈器/顯影器上,在1500rpm下旋塗來用表6中指定之各別圖案處理組合物外塗佈其他晶片。圖案化晶片在100℃下軟烘烤60秒,且在旋塗器上用乙酸正丁酯沖洗。藉由SEM觀測所得圖案且在圖案之中間高度處量測平均接觸孔直徑(CD f )。計算圖案處理組合物之平均收縮量△CD(=CDi-CDf)。結果展示於表6中。所量測之範圍內各劑量下之收縮量(△CD)實質上恆定,表明本發明之圖案處理組合物之低鄰近偏差。
Claims (12)
- 一種圖案處理組合物,其包括嵌段共聚物及有機溶劑,其中所述嵌段共聚物包括第一嵌段及第二嵌段,其中所述第一嵌段包括由第一單體形成之單元,所述第一單體包括烯系不飽和可聚合基團及氫受體基團,其中所述第一嵌段不含酸不穩定基團,且其中所述氫受體基團為含氮基團,且所述第二嵌段包括由第二單體形成之單元,所述第二單體包括烯系不飽和可聚合基團及環狀脂族基團,且其中:(i)所述第二嵌段包括由第三單體形成之單元,所述第三單體包括烯系不飽和可聚合基團,且所述第二單體與所述第三單體不同;及/或(ii)所述嵌段共聚物包括第三嵌段,所述第三嵌段包括由第四單體形成之單元,所述第四單體包括烯系不飽和可聚合基團,其中所述第四單體與所述第一單體及所述第二單體不同,且所述嵌段共聚物以所述圖案處理組合物之總固體計以80至99重量%存在於所述圖案處理組合物中,且所述有機溶劑以所述圖案處理組合物計90至99重量%之量存在。
- 如申請專利範圍第1項所述的圖案處理組合物,其中所述含氮基團選自胺、醯胺及吡啶。
- 如申請專利範圍第2項所述的圖案處理組合物,其中所述第一單體為甲基丙烯酸N,N-二甲胺基乙酯或乙烯基吡啶。
- 如申請專利範圍第1項所述的圖案處理組合物,其中所述環狀脂族基團為單環的。
- 如申請專利範圍第1項所述的圖案處理組合物,其中所述環狀脂族基團為多環的。
- 如申請專利範圍第1項至第5項中任一項所述的圖案處理組合物,其中所述環狀脂族基團選自視情況經取代之環己基、視情況經取代之金剛烷基及視情況經取代之降冰片基中之一或多種。
- 如申請專利範圍第1項至第5項中任一項所述的圖案處理組合物,其中所述第二嵌段包括由第三單體形成之單元,其中所述第三單體包括脂族基團及/或芳族基團。
- 如申請專利範圍第1項至第5項中任一項所述的圖案處理組合物,其中所述組合物包括所述第三嵌段,所述第三嵌段包括由第四單體形成之單元,其中所述第四單體包括脂族基團及/或芳族基團。
- 如申請專利範圍第1項至第5項中任一項所述的圖案處理組合物,其中所述嵌段共聚物不含氟烷基。
- 一種圖案處理方法,其包括:(a)提供半導體基板,其在其表面上包括圖案化特徵;(b)向所述圖案化特徵施用如申請專利範圍第1項至第9項中任一項所述的圖案處理組合物;以及(c)自所述基板洗去殘餘圖案處理組合物,留下結合到所述圖案化特徵之嵌段共聚物。
- 如申請專利範圍第10項所述的圖案處理方法,其中所述圖案化特徵為光阻圖案。
- 如申請專利範圍第11項所述的圖案處理方法,其進一步包括使用所述圖案化特徵和經結合之該嵌段共聚物作為蝕刻遮罩蝕刻所述圖案化特徵下方的層。
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TWI714670B (zh) * | 2015-11-19 | 2021-01-01 | 盧森堡商Az電子材料盧森堡有限公司 | 形成細緻光阻圖案用之組成物及使用其之圖案形成方法 |
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KR101809571B1 (ko) | 2017-12-15 |
US9703203B2 (en) | 2017-07-11 |
TW201643214A (zh) | 2016-12-16 |
CN106243513A (zh) | 2016-12-21 |
JP2017010015A (ja) | 2017-01-12 |
US20160357111A1 (en) | 2016-12-08 |
JP6231161B2 (ja) | 2017-11-15 |
KR20160142786A (ko) | 2016-12-13 |
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