JP2021015970A - シリコン窒化膜エッチング溶液、及びこれを用いた半導体素子の製造方法 - Google Patents
シリコン窒化膜エッチング溶液、及びこれを用いた半導体素子の製造方法 Download PDFInfo
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- 238000005530 etching Methods 0.000 title claims abstract description 96
- 229910052581 Si3N4 Inorganic materials 0.000 title claims abstract description 79
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000004065 semiconductor Substances 0.000 title claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000002245 particle Substances 0.000 claims abstract description 22
- 239000008119 colloidal silica Substances 0.000 claims abstract description 16
- 239000000243 solution Substances 0.000 claims description 60
- 150000001875 compounds Chemical class 0.000 claims description 50
- 239000000126 substance Substances 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 23
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 22
- 229910052731 fluorine Inorganic materials 0.000 claims description 14
- 239000011737 fluorine Substances 0.000 claims description 14
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 13
- 125000000217 alkyl group Chemical group 0.000 claims description 12
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 229910052736 halogen Inorganic materials 0.000 claims description 5
- 150000002367 halogens Chemical class 0.000 claims description 5
- 125000003396 thiol group Chemical group [H]S* 0.000 claims description 5
- 125000003545 alkoxy group Chemical group 0.000 claims description 4
- 150000001412 amines Chemical group 0.000 claims description 4
- 125000001188 haloalkyl group Chemical group 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 125000000008 (C1-C10) alkyl group Chemical group 0.000 claims description 3
- 125000006376 (C3-C10) cycloalkyl group Chemical group 0.000 claims description 3
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 150000001450 anions Chemical class 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 150000002892 organic cations Chemical class 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 125000000101 thioether group Chemical group 0.000 claims description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 2
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 2
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 2
- 239000001099 ammonium carbonate Substances 0.000 claims description 2
- LDDQLRUQCUTJBB-UHFFFAOYSA-O azanium;hydrofluoride Chemical compound [NH4+].F LDDQLRUQCUTJBB-UHFFFAOYSA-O 0.000 claims description 2
- 150000002431 hydrogen Chemical group 0.000 claims 2
- 229910052814 silicon oxide Inorganic materials 0.000 abstract description 34
- 239000011856 silicon-based particle Substances 0.000 abstract description 7
- 150000007970 thio esters Chemical class 0.000 abstract description 6
- 150000001413 amino acids Chemical class 0.000 abstract description 5
- 150000002148 esters Chemical class 0.000 abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 14
- 229910052710 silicon Inorganic materials 0.000 description 14
- 239000010703 silicon Substances 0.000 description 14
- 239000000758 substrate Substances 0.000 description 14
- 239000012528 membrane Substances 0.000 description 11
- -1 3-methylbut-2-yl Chemical group 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 6
- 125000004432 carbon atom Chemical group C* 0.000 description 5
- 238000001039 wet etching Methods 0.000 description 5
- 235000001014 amino acid Nutrition 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 125000000753 cycloalkyl group Chemical group 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 239000005368 silicate glass Substances 0.000 description 3
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 125000005210 alkyl ammonium group Chemical group 0.000 description 2
- 125000001246 bromo group Chemical group Br* 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 125000001309 chloro group Chemical group Cl* 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 239000002608 ionic liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000005360 phosphosilicate glass Substances 0.000 description 2
- 229920001709 polysilazane Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 150000003377 silicon compounds Chemical class 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 description 1
- CKLJMWTZIZZHCS-REOHCLBHSA-N L-aspartic acid Chemical compound OC(=O)[C@@H](N)CC(O)=O CKLJMWTZIZZHCS-REOHCLBHSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004520 agglutination Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000000539 amino acid group Chemical group 0.000 description 1
- 235000003704 aspartic acid Nutrition 0.000 description 1
- OQFSQFPPLPISGP-UHFFFAOYSA-N beta-carboxyaspartic acid Natural products OC(=O)C(N)C(C(O)=O)C(O)=O OQFSQFPPLPISGP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000005380 borophosphosilicate glass Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229940125904 compound 1 Drugs 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 125000002933 cyclohexyloxy group Chemical group C1(CCCCC1)O* 0.000 description 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000572 ellipsometry Methods 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 235000013922 glutamic acid Nutrition 0.000 description 1
- 239000004220 glutamic acid Substances 0.000 description 1
- 125000004970 halomethyl group Chemical group 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000003136 n-heptyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000002898 organic sulfur compounds Chemical class 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 125000003548 sec-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 125000001424 substituent group Chemical group 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/08—Etching, surface-brightening or pickling compositions containing an inorganic acid containing a fluorine compound
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/06—Etching, surface-brightening or pickling compositions containing an inorganic acid with organic material
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- 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
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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
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- 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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Abstract
Description
Aは、1μm以下のコロイダルシリカ粒子であり、
mは、1〜5の整数であり、
X及びZは、それぞれ独立して窒素、硫黄及び酸素から選択され、
Yは、水素、アミン、ヒドロキシ基、アルコキシ基、チオール基、及びチオエーテル基から選択され、
nは、0〜5の整数であり、
R1及びR2は、それぞれ独立して非共有電子対、水素、ハロゲン、ハロアルキル基、C1−C10のアルキル基、及びC3−C10のシクロアルキル基から選択され、
pは、1〜5の整数である。
Aは、1μm以下のコロイダルシリカ粒子であり、
mは、1〜5の整数であり、
X及びZは、それぞれ独立して窒素、硫黄及び酸素から選択され、
Yは、水素、アミン、ヒドロキシ基、アルコキシ基、チオール基、及びチオエーテル基から選択され、
nは、0〜5の整数であり、
R1及びR2は、それぞれ独立して非共有電子対、水素、ハロゲン、ハロアルキル基、C1−C10のアルキル基、及びC3−C10のシクロアルキル基から選択され、
pは、1〜5の整数である。
acid)、チオエステル系(thioester)またはエステル系(ester)基を導入することで、前記シリカ粒子らが互いに結合して凝集する現象を抑制することができる。すなわち、コロイダルシリカ粒子間をアミノ酸系、チオエステル系またはエステル系基で連結して、加水分解反応を抑制することによって、Si−O−Si結合の生成を防ぐことができる。これによって、化1で表される化合物が含まれたシリコン窒化膜エッチング溶液は、常温でコロイダルシリカ粒子の大きさが一定に維持されて、シリコン窒化膜エッチング溶液の保管性が向上することができる。
acid)、グルタミン酸(glutamic acid)等があり、このとき、化1で表される化合物における前記X及びZは、窒素であり、前記Yは、アミンであってもよい。
nは、1〜5の整数であり、
R1及びR2は、C1−C10のアルキル基であり、
A、m及びpは、上記化1に定義したとおりである。
hinderance)の効果が増加し得る。これによって、コロイダルシリカ粒子らが互いに結合して凝集する現象をより効果よく抑制することができる。
A、m及びpは、上記化1に定義したとおりである。
未満で存在する場合、エッチング条件下でシリコン化合物の量が十分でなく、シリコン酸化膜に対しシリコン窒化膜に対するエッチング選択比の増加効果が微弱であり得る。
Plasma)膜、熱酸化膜(thermal oxide)、BPSG(Borophosphate
Silicate Glass)膜、PSG(Phospho Silicate Glass)膜、BSG(Boro Silicate
Glass)膜、PSZ(Polysilazane)膜、FSG(Fluorinated Silicate
Glass)膜、LP−TEOS(Low
Pressure Tetra Ethyl Ortho Silicate)膜、PETEOS(Plasma Enhanced Tetra
Ethyl Ortho Silicate)膜、HTO(High Temperature Oxide)膜、MTO(Medium
Temperature Oxide)膜、USG(Undopped Silicate Glass)膜、SOG(Spin On Glass)膜、APL(Advanced Planarization
Layer)膜、ALD(Atomic Layer
Deposition)膜、PE−酸化膜(Plasma Enhanced oxide)又はO3−TEOS(O3−Tetra Ethyl
Ortho Silicate)等に言及し得る。
エッチング溶液の製造
実施例1〜5では、化1で表される化合物をリン酸水溶液に添加して、初基濃度が1,000ppmになるようにエッチング溶液を製造した。
シリカ凝集粒子の大きさ測定
実施例1〜5及び比較例2のシリカ粒子を常温(25℃)で時間経過によるシリカ凝集粒子の大きさを測定した。実施例1〜5及び比較例2のシリカ粒子の初期大きさは、5nmで同一であり、シリカ凝集粒子らの大きさは、PSA(particle
size analyzer)を用いて測定した。測定されたシリカ凝集粒子の大きさは、下記表2のとおりである。
化1で表される化合物の初基濃度が200ppmになるようにエッチング溶液を製造したことを除いては、前記実施例1〜5及び比較例1〜2と同様なエッチング溶液を製造した。
MG−1000;Ellippsometery)を用いて測定しており、エッチング速度は、エッチングの前及びエッチング後、シリコン酸化膜及びシリコン窒化膜の厚みの差をエッチング時間(10分)で除して算出した数値である。
11 シリコン窒化膜
12 シリコン酸化膜
20 積層構造体
30 マスクパターン層
50 トレンチ
Claims (7)
- 前記シリコン窒化膜エッチング溶液のうち、上記化1で表される化合物は、200〜100,000ppmで含まれることを特徴とする、
請求項1に記載のシリコン窒化膜エッチング溶液。 - 前記シリコン窒化膜エッチング溶液は、フッ化水素、フッ化アンモニウム、重フッ化アンモニウム、及びフッ化水素アンモニウムから選択される少なくとも一つのフッ素含有化合物をさらに含む、
請求項1に記載のシリコン窒化膜エッチング溶液。 - 前記シリコン窒化膜エッチング溶液は、有機系カチオンとフッ素系アニオンとがイオン結合した形態を有するフッ素含有化合物をさらに含む、
請求項1に記載のシリコン窒化膜エッチング溶液。 - 請求項1によるシリコン窒化膜エッチング溶液を用いて行われるエッチング工程を含む半導体素子の製造方法。
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US9868902B2 (en) * | 2014-07-17 | 2018-01-16 | Soulbrain Co., Ltd. | Composition for etching |
US10325779B2 (en) | 2016-03-30 | 2019-06-18 | Tokyo Electron Limited | Colloidal silica growth inhibitor and associated method and system |
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US10995269B2 (en) * | 2016-11-24 | 2021-05-04 | Samsung Electronics Co., Ltd. | Etchant composition and method of fabricating integrated circuit device using the same |
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