WO2022138754A1 - シリコンエッチング液、該エッチング液を用いたシリコンデバイスの製造方法および基板処理方法 - Google Patents
シリコンエッチング液、該エッチング液を用いたシリコンデバイスの製造方法および基板処理方法 Download PDFInfo
- Publication number
- WO2022138754A1 WO2022138754A1 PCT/JP2021/047675 JP2021047675W WO2022138754A1 WO 2022138754 A1 WO2022138754 A1 WO 2022138754A1 JP 2021047675 W JP2021047675 W JP 2021047675W WO 2022138754 A1 WO2022138754 A1 WO 2022138754A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- silicon
- group
- formula
- quaternary ammonium
- carbon atoms
- Prior art date
Links
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 196
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 196
- 239000010703 silicon Substances 0.000 title claims abstract description 196
- 238000005530 etching Methods 0.000 title claims abstract description 182
- 239000000758 substrate Substances 0.000 title claims description 32
- 238000000034 method Methods 0.000 title claims description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 238000012545 processing Methods 0.000 title claims description 9
- 239000007788 liquid Substances 0.000 title abstract description 8
- 125000001453 quaternary ammonium group Chemical group 0.000 claims abstract description 61
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 54
- 239000000908 ammonium hydroxide Substances 0.000 claims abstract description 37
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 36
- 150000002440 hydroxy compounds Chemical class 0.000 claims abstract description 33
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 125000003118 aryl group Chemical group 0.000 claims abstract description 14
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 claims abstract description 13
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical group [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 6
- 125000001309 chloro group Chemical group Cl* 0.000 claims abstract description 6
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 5
- 125000001153 fluoro group Chemical group F* 0.000 claims abstract description 5
- 125000004432 carbon atom Chemical group C* 0.000 claims description 62
- 239000013078 crystal Substances 0.000 claims description 31
- 150000001450 anions Chemical class 0.000 claims description 12
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 11
- 229920005591 polysilicon Polymers 0.000 claims description 11
- 229910021417 amorphous silicon Inorganic materials 0.000 claims description 10
- 125000001424 substituent group Chemical group 0.000 claims description 7
- NJQFCQXFOHVYQJ-PMACEKPBSA-N BF 4 Chemical compound C1([C@@H]2CC(=O)C=3C(O)=C(C)C4=C(C=3O2)[C@H](C(C)C)C2=C(O4)C(C)=C(C(C2=O)(C)C)OC)=CC=CC=C1 NJQFCQXFOHVYQJ-PMACEKPBSA-N 0.000 claims description 4
- 229910015892 BF 4 Inorganic materials 0.000 claims description 4
- 239000003513 alkali Substances 0.000 abstract description 13
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 abstract 1
- 125000000547 substituted alkyl group Chemical group 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 83
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 28
- -1 hydroxyethyl group Chemical group 0.000 description 28
- 229910052814 silicon oxide Inorganic materials 0.000 description 28
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 26
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 18
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 15
- 239000007864 aqueous solution Substances 0.000 description 14
- 229910052581 Si3N4 Inorganic materials 0.000 description 13
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 13
- 235000012431 wafers Nutrition 0.000 description 11
- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 description 10
- 239000012535 impurity Substances 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- KVFVBPYVNUCWJX-UHFFFAOYSA-M ethyl(trimethyl)azanium;hydroxide Chemical compound [OH-].CC[N+](C)(C)C KVFVBPYVNUCWJX-UHFFFAOYSA-M 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 description 6
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 description 6
- LPSKDVINWQNWFE-UHFFFAOYSA-M tetrapropylazanium;hydroxide Chemical compound [OH-].CCC[N+](CCC)(CCC)CCC LPSKDVINWQNWFE-UHFFFAOYSA-M 0.000 description 6
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 5
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 5
- 229940093476 ethylene glycol Drugs 0.000 description 5
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 5
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- TVXBFESIOXBWNM-UHFFFAOYSA-N Xylitol Natural products OCCC(O)C(O)C(O)CCO TVXBFESIOXBWNM-UHFFFAOYSA-N 0.000 description 3
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 229940105990 diglycerin Drugs 0.000 description 3
- GPLRAVKSCUXZTP-UHFFFAOYSA-N diglycerol Chemical compound OCC(O)COCC(O)CO GPLRAVKSCUXZTP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 229960005150 glycerol Drugs 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 description 3
- HTKPDYSCAPSXIR-UHFFFAOYSA-N octyltrimethylammonium ion Chemical class CCCCCCCC[N+](C)(C)C HTKPDYSCAPSXIR-UHFFFAOYSA-N 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 229910021642 ultra pure water Inorganic materials 0.000 description 3
- 239000012498 ultrapure water Substances 0.000 description 3
- 239000000811 xylitol Substances 0.000 description 3
- 235000010447 xylitol Nutrition 0.000 description 3
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 description 3
- 229960002675 xylitol Drugs 0.000 description 3
- DNIAPMSPPWPWGF-VKHMYHEASA-N (+)-propylene glycol Chemical compound C[C@H](O)CO DNIAPMSPPWPWGF-VKHMYHEASA-N 0.000 description 2
- YPFDHNVEDLHUCE-UHFFFAOYSA-N 1,3-propanediol Substances OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 2
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 2
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 description 2
- 239000004386 Erythritol Substances 0.000 description 2
- UNXHWFMMPAWVPI-UHFFFAOYSA-N Erythritol Natural products OCC(O)C(O)CO UNXHWFMMPAWVPI-UHFFFAOYSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- 229930195725 Mannitol Natural products 0.000 description 2
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 2
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 2
- 150000005215 alkyl ethers Chemical class 0.000 description 2
- BMRWNKZVCUKKSR-UHFFFAOYSA-N butane-1,2-diol Chemical compound CCC(O)CO BMRWNKZVCUKKSR-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- RKMJXTWHATWGNX-UHFFFAOYSA-N decyltrimethylammonium ion Chemical class CCCCCCCCCC[N+](C)(C)C RKMJXTWHATWGNX-UHFFFAOYSA-N 0.000 description 2
- UNXHWFMMPAWVPI-ZXZARUISSA-N erythritol Chemical compound OC[C@H](O)[C@H](O)CO UNXHWFMMPAWVPI-ZXZARUISSA-N 0.000 description 2
- 235000019414 erythritol Nutrition 0.000 description 2
- 229940009714 erythritol Drugs 0.000 description 2
- YOMFVLRTMZWACQ-UHFFFAOYSA-N ethyltrimethylammonium Chemical compound CC[N+](C)(C)C YOMFVLRTMZWACQ-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 2
- 238000004255 ion exchange chromatography Methods 0.000 description 2
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 2
- 239000000594 mannitol Substances 0.000 description 2
- 235000010355 mannitol Nutrition 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 229940059574 pentaerithrityl Drugs 0.000 description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 2
- IVDFJHOHABJVEH-UHFFFAOYSA-N pinacol Chemical compound CC(C)(O)C(C)(C)O IVDFJHOHABJVEH-UHFFFAOYSA-N 0.000 description 2
- 229920000233 poly(alkylene oxides) Polymers 0.000 description 2
- 229920000166 polytrimethylene carbonate Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- DZLFLBLQUQXARW-UHFFFAOYSA-N tetrabutylammonium Chemical compound CCCC[N+](CCCC)(CCCC)CCCC DZLFLBLQUQXARW-UHFFFAOYSA-N 0.000 description 2
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 2
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 2
- 229940113165 trimethylolpropane Drugs 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229940015975 1,2-hexanediol Drugs 0.000 description 1
- HMBHAQMOBKLWRX-UHFFFAOYSA-N 2,3-dihydro-1,4-benzodioxine-3-carboxylic acid Chemical compound C1=CC=C2OC(C(=O)O)COC2=C1 HMBHAQMOBKLWRX-UHFFFAOYSA-N 0.000 description 1
- WAEVWDZKMBQDEJ-UHFFFAOYSA-N 2-[2-(2-methoxypropoxy)propoxy]propan-1-ol Chemical compound COC(C)COC(C)COC(C)CO WAEVWDZKMBQDEJ-UHFFFAOYSA-N 0.000 description 1
- KIZQNNOULOCVDM-UHFFFAOYSA-M 2-hydroxyethyl(trimethyl)azanium;hydroxide Chemical compound [OH-].C[N+](C)(C)CCO KIZQNNOULOCVDM-UHFFFAOYSA-M 0.000 description 1
- ALQSHHUCVQOPAS-UHFFFAOYSA-N Pentane-1,5-diol Chemical compound OCCCCCO ALQSHHUCVQOPAS-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 125000005210 alkyl ammonium group Chemical group 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- FIVJMCNNMIGYRO-UHFFFAOYSA-N bis(2-hydroxyethyl)-dimethylazanium Chemical compound OCC[N+](C)(C)CCO FIVJMCNNMIGYRO-UHFFFAOYSA-N 0.000 description 1
- RKTGAWJWCNLSFX-UHFFFAOYSA-M bis(2-hydroxyethyl)-dimethylazanium;hydroxide Chemical compound [OH-].OCC[N+](C)(C)CCO RKTGAWJWCNLSFX-UHFFFAOYSA-M 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229940075419 choline hydroxide Drugs 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- PDXRQENMIVHKPI-UHFFFAOYSA-N cyclohexane-1,1-diol Chemical compound OC1(O)CCCCC1 PDXRQENMIVHKPI-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 125000002704 decyl 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])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 125000003438 dodecyl 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])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- XJWSAJYUBXQQDR-UHFFFAOYSA-M dodecyltrimethylammonium bromide Chemical compound [Br-].CCCCCCCCCCCC[N+](C)(C)C XJWSAJYUBXQQDR-UHFFFAOYSA-M 0.000 description 1
- VICYBMUVWHJEFT-UHFFFAOYSA-N dodecyltrimethylammonium ion Chemical class CCCCCCCCCCCC[N+](C)(C)C VICYBMUVWHJEFT-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- FHKSXSQHXQEMOK-UHFFFAOYSA-N hexane-1,2-diol Chemical compound CCCCC(O)CO FHKSXSQHXQEMOK-UHFFFAOYSA-N 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229940051250 hexylene glycol Drugs 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000004811 liquid chromatography Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 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
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000003856 quaternary ammonium compounds Chemical class 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 150000003839 salts 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
- 229910052709 silver Inorganic materials 0.000 description 1
- 230000003595 spectral effect Effects 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
- OSBSFAARYOCBHB-UHFFFAOYSA-N tetrapropylammonium Chemical compound CCC[N+](CCC)(CCC)CCC OSBSFAARYOCBHB-UHFFFAOYSA-N 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- GCRCSLNXFKCFHB-UHFFFAOYSA-N triethyl(hexyl)azanium Chemical class CCCCCC[N+](CC)(CC)CC GCRCSLNXFKCFHB-UHFFFAOYSA-N 0.000 description 1
- NFRBUOMQJKUACC-UHFFFAOYSA-N triethyl(pentyl)azanium Chemical class CCCCC[N+](CC)(CC)CC NFRBUOMQJKUACC-UHFFFAOYSA-N 0.000 description 1
- GLFDLEXFOHUASB-UHFFFAOYSA-N trimethyl(tetradecyl)azanium Chemical class CCCCCCCCCCCCCC[N+](C)(C)C GLFDLEXFOHUASB-UHFFFAOYSA-N 0.000 description 1
- FVJLCPJDDAGIJE-UHFFFAOYSA-N tris(2-hydroxyethyl)-methylazanium Chemical compound OCC[N+](C)(CCO)CCO FVJLCPJDDAGIJE-UHFFFAOYSA-N 0.000 description 1
- IJGSGCGKAAXRSC-UHFFFAOYSA-M tris(2-hydroxyethyl)-methylazanium;hydroxide Chemical compound [OH-].OCC[N+](C)(CCO)CCO IJGSGCGKAAXRSC-UHFFFAOYSA-M 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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
-
- 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
-
- 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
-
- 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
- H01L21/30604—Chemical etching
-
- 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
- H01L21/30604—Chemical etching
- H01L21/30608—Anisotropic liquid etching
-
- 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
- H01L21/31—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
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
Definitions
- the present invention relates to a silicon etching solution used in surface processing and etching processes when manufacturing various silicon devices.
- the present invention also relates to a substrate processing method using the etching solution.
- the substrate includes a semiconductor wafer, a silicon substrate, or the like.
- the present invention also relates to a method for manufacturing a silicon device using the etching solution.
- Silicon etching is used in various processes in the manufacturing process of semiconductor devices.
- processing processes using silicon have been widely used in the process of stacking memory cells and making logic devices three-dimensional, and the silicon etching used at that time is smooth after etching due to the densification of the device.
- Etching accuracy, etching selectivity with other materials, etc. are becoming stricter.
- it is also applied to processes such as thinning of wafers.
- Such various silicon devices are required to be highly integrated, miniaturized, highly sensitive, and highly functional depending on the application, and in order to satisfy these requirements, silicon is used as a microfabrication technology in the manufacture of these silicon devices. Etching is emphasized.
- silicon etching includes etching with a fluoroacid-nitric acid aqueous solution and etching using an alkali.
- the former etching with a fluoroacid-nitrite aqueous solution can be isotropically etched regardless of the crystal orientation of silicon, and can be uniformly etched to single crystal silicon, polysilicon, and amorphous silicon.
- the fluoroacid-nitrite aqueous solution oxidizes silicon and etches it as a silicon oxide film, there is no selectivity with the silicon oxide film, so the semiconductor that leaves the silicon oxide film as part of the mask material and pattern structure. It could not be used in the manufacturing process.
- Crystal anisotropy refers to the property (etching anisotropy) in which the etching rate differs depending on the crystal orientation of silicon. Utilizing this property, alkaline etching is used for processing a silicon device having a complicated three-dimensional structure with respect to single crystal silicon and for smooth etching of a silicon surface.
- alkali has the feature that not only the etching selectivity of silicon for the silicon nitride film is high, but also the etching selectivity of silicon for the silicon oxide film is high, so that the silicon nitride film and the silicon oxide film are retained in the semiconductor manufacturing process.
- the term "high etching selectivity of silicon” means a property of exhibiting particularly high etching selectivity of silicon with respect to a specific member. For example, when etching a substrate having a silicon film of single crystal silicon, polysilicon, or amorphous silicon and another film (for example, silicon oxide film), only the silicon film is etched and the silicon oxide film is not etched.
- the alkaline etching solution has high etching selectivity of silicon with respect to the silicon oxide film and the silicon nitride film, and selectively etches the silicon film.
- an aqueous solution of a general alkaline chemical such as KOH, hydrazine, or tetramethylammonium hydroxide (hereinafter, also referred to as TMAH) can be used (see Patent Documents 1 and 2).
- KOH and TMAH which have low toxicity and are easy to handle, are preferably used alone.
- TMAH is more preferably used in consideration of contamination with metal impurities and etching selectivity with a silicon oxide film.
- the etching selectivity with the silicon oxide film represents a value obtained by dividing the etching rate of silicon by the etching rate of the silicon oxide film.
- Patent Document 1 discloses an etching solution for a silicon substrate for a solar cell, which contains alkali hydroxide, water, and a polyalkylene oxide alkyl ether.
- Patent Document 2 discloses an etching solution for a silicon substrate for a solar cell containing an alkaline compound, an organic solvent, a surfactant and water.
- TMAH is exemplified as an example of an alkaline compound
- polyalkylene oxide alkyl ether is exemplified as an organic solvent, but the alkaline compounds actually used are sodium hydroxide and potassium hydroxide.
- Patent Document 3 describes water, quaternary alkylammonium hydroxide, and water miscibility as an etching solution suitable for selectively removing silicon from a microelectronic device containing silicon and silicon-germanium with respect to silicon-germanium.
- a silicon etching solution containing a sex solvent is disclosed, and ethylene glycol, tripropylene glycol methyl ether and the like are described as water-miscible solvents.
- alkali etching has higher selectivity for silicon oxide film than fluoroacid-nitrite aqueous solution, but alkali metal hydroxide has higher silicon oxide film etching than quaternary ammonium hydroxide. The speed is high. Therefore, the silicon oxide film that should remain as a part of the mask material and the pattern structure is also etched, and it is not possible to selectively etch only the silicon film. Further, since these etching solutions are intended to enhance crystal anisotropy and roughen the surface, the silicon film cannot be etched smoothly.
- Non-Patent Document 1 can etch silicon isotropically, it does not directly dissolve silicon, but dissolves silicon by etching an oxide film oxidized by applying a voltage with a KOH aqueous solution. Therefore, there is no etching selectivity between silicon and the silicon oxide film.
- an object of the present invention is to provide a silicon etching solution capable of suppressing the generation of hillock on the silicon surface even when the alkali concentration is low and having a high selectivity with the silicon oxide film. And.
- Quaternary ammonium hydroxide indicated by The following formula (2) R 21 R 22 R 23 R 24 N + ⁇ X- ( 2) (In the formula, R 21 , R 22 , R 23 and R 24 are alkyl groups having 16 or less carbon atoms, one of which may have a substituent, and the remaining three are alkyl groups having 1 or 2 carbon atoms. The group is a group, and the alkyl group having 16 or less carbon atoms and the alkyl group having 1 or 2 carbon atoms may have a hydroxy group.
- X is a group consisting of BF 4 , a fluorine atom, a chlorine atom, and a bromine atom.
- a quaternary ammonium salt which is indicated by and has a total number of carbons of 11 to 20.
- concentration of the quaternary ammonium salt represented by the above formula (2) is 1.5 to 50% by mass, which contains a polyvalent hydroxy compound having 2 to 12 carbon atoms and having 2 or more hydroxyl groups in the molecule and water. Is a silicon etching solution.
- the concentration of the quaternary ammonium hydroxide represented by the formula (1) is 0.05 to 1.1 mol / L,
- the silicon etching solution according to [1], wherein the concentration of the multivalent hydroxy compound having 2 to 12 carbon atoms and having 2 or more hydroxyl groups in the molecule is 10 to 80% by mass.
- R 11 R 12 R 13 R 14 N + (1') (In the formula, R 11 , R 12 , R 13 and R 14 are independently aryl groups, benzyl groups, or alkyl groups having 1 to 4 carbon atoms, and the alkyl groups, aryl groups, or benzyl groups are the same.
- R 21 , R 22 , R 23 and R 24 are alkyl groups having 16 or less carbon atoms, one of which may have a substituent, and the remaining three are alkyl groups having 1 or 2 carbon atoms.
- the alkyl group having 16 or less carbon atoms and the alkyl group having 1 or 2 carbon atoms may have a hydroxy group.
- a quaternary ammonium cation which is indicated by and has a total number of carbons of 11 to 20.
- a method for manufacturing a silicon device including a step of etching at least one selected from the group consisting of a silicon wafer, a silicon single crystal film, a polysilicon film, and an amorphous silicon film, the etching is performed from [1] to [4].
- the silicon etching solution of the present invention can smoothly etch the surface of a silicon wafer, a single crystal silicon film, a polysilicon film, and an amorphous silicon film even when the quaternary ammonium hydroxide concentration is low, and silicon. Silicon etching processing with a high selectivity with the oxide film is possible.
- the silicon etching solution of the present invention is particularly useful as a silicon etching solution for smoothly etching a silicon surface.
- R 11 , R 12 , R 13 and R 14 are independently aryl groups, benzyl groups, or alkyl groups having 1 to 4 carbon atoms, respectively.
- the alkyl group, aryl group, or benzyl group may have a hydroxy group.
- the alkyl group in R 11 , R 12 , R 13 and R 14 has 1 to 4 carbon atoms, and an alkyl group having 1 or 2 carbon atoms is preferable.
- an aryl group having 6 to 10 carbon atoms is preferable.
- R 11 , R 12 , R 13 and R 14 include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group and sec-butyl group.
- the total number of carbon atoms in R 11 , R 12 , R 13 and R 14 is preferably 20 or less, more preferably 16 or less, and particularly preferably 8 or less from the viewpoint of solubility. Further, R 11 , R 12 , R 13 and R 14 are preferably an alkyl group having 1 to 4 carbon atoms or an alkyl group having 1 to 4 carbon atoms substituted with a hydroxy group, and at least three of them are the same alkyl group. It is preferable to have.
- the alkyl group having 1 to 4 carbon atoms is preferably a methyl, ethyl, propyl, butyl group or isobutyl group, and the alkyl group having 1 to 4 carbon atoms substituted with a hydroxy group is preferably a hydroxyethyl group, and at least three of them are the same alkyl group. Is preferably a methyl group, an ethyl group, or a butyl group.
- TMAH, choline hydroxide, TEAH, ETMAH, TPAH, or TBAH used in the conventional silicon etching solution consisting of a quaternary ammonium hydroxide aqueous solution can be preferably used.
- TMAH, ETMAH, TEAH, and TPAH because of the high etching rate of silicon.
- the quaternary ammonium hydroxide represented by the formula (1) one type may be used alone, or a plurality of different types may be mixed and used.
- the silicon etching solution of the present invention further contains a quaternary ammonium salt represented by the above formula (2).
- a quaternary ammonium salt represented by the formula (2) By containing the quaternary ammonium salt represented by the formula (2), the generation of pyramid-shaped hillock surrounded by the (111) plane on the silicon surface is further suppressed, and the silicon surface is further smoothed without roughness. Can be etched into. Therefore, even if the concentration of the multivalent hydroxy compound is low, the generation of pyramid-shaped hillock surrounded by the (111) plane on the silicon surface can be suppressed, and the silicon surface can be etched smoothly without roughness. ..
- one of R 21 , R 22 , R 23 and R 24 is an alkyl group having 16 or less carbon atoms which may have a substituent.
- the remaining three are alkyl groups having 1 or 2 carbon atoms, and the three alkyl groups may be the same group or different groups.
- the total number of carbons in the molecule of the quaternary ammonium salt represented by the formula (2) is 11 to 20.
- X is at least one selected from the group consisting of BF 4 , fluorine atom, chlorine atom, and bromine atom.
- One alkyl group having 16 or less carbon atoms may have a hydroxy group as a substituent.
- the alkyl group having 1 or 2 carbon atoms may have a hydroxy group as a substituent.
- alkyl group having 16 or less carbon atoms examples include an unsubstituted alkyl group having 16 or less carbon atoms such as a hexyl group, an octyl group, a decyl group, a dodecyl group, a tetradecyl group and a hexadecyl group; a hydroxyhexyl group, a hydroxyoctyl group and a hydroxydecyl group.
- alkyl group having 16 or less carbon atoms substituted with a hydroxy group such as a group, a hydroxydodecyl group, a hydroxytetradecyl group and a hexadecyl.
- an alkyl group having a lower limit of 5 or more carbon atoms is preferable, an alkyl having 8 or more carbon atoms is more preferable, and an alkyl group having 10 or more carbon atoms is particularly preferable. Further, the upper limit is more preferably 12 or less carbon atoms.
- the quaternary ammonium salt represented by the formula (2) contains the above-mentioned alkyl group having a relatively large number of carbon atoms as one of R 21 , R 22 , R 23 and R 24 .
- R 21 , R 22 , R 23 and R 24 are alkyl groups having 1 or 2 carbon atoms which may have a hydroxy group, specifically, a methyl group, an ethyl group and a hydroxymethyl group.
- a group and a hydroxyethyl group can be mentioned.
- an alkyl group having 1 or 2 carbon atoms is preferable, and a methyl group is more preferable.
- the three alkyl groups may be the same group or different groups, and it is more preferable that all of them are methyl groups.
- the total number of carbons in the molecule of the quaternary ammonium salt represented by the formula (2) is 11 to 20, and 11 to 15 from the viewpoint of solubility in water and smooth etching of the silicon surface. Is more preferable.
- X is BF 4 , a fluorine atom, a chlorine atom, or a bromine atom, preferably a chlorine atom or a bromine atom, and more preferably a bromine atom.
- quaternary ammonium salt represented by the formula (2) which is particularly preferably used in the present invention, are pentyltriethylammonium salt, hexyltriethylammonium salt, octyltrimethylammonium salt, decyltrimethylammonium salt, and dodecyltrimethyl.
- Ammonium salts and tetradecyltrimethylammonium salts are preferred. Of these, octyltrimethylammonium salt, decyltrimethylammonium salt, and dodecyltrimethylammonium salt can be preferably used.
- the quaternary ammonium salt represented by the formula (2) one kind may be used alone, or a plurality of different kinds may be mixed and used. Therefore, there may be two or more types of X. For example, a mixture of two or more kinds of X - containing a quaternary ammonium salt may be used as a counter anion for the same quaternary ammonium cation.
- the concentration of the quaternary ammonium salt represented by the formula (2) is 1.5 to 50% by mass, preferably 1.5 to 25% by mass. Further, the upper limit may be 10% by mass or less.
- concentration of the quaternary ammonium salt represented by the formula (2) in this range, the silicon surface becomes rough even when the concentration of the quaternary ammonium hydroxide represented by the formula (1) is low. It is possible to etch smoothly without any problem. Specifically, the surface roughness of the (100) surface of silicon is reduced, and the pyramid-shaped hillock surrounded by the (111) surface is suppressed, so that smooth etching is possible. Is possible.
- the silicon etching solution of the present invention has 2 to 12 carbon atoms in addition to the quaternary ammonium hydroxide represented by the formula (1) and the quaternary ammonium salt represented by the formula (2), and is contained in the molecule. It is characterized by containing a polyvalent hydroxy compound having two or more hydroxyl groups (hereinafter, also simply referred to as a polyvalent hydroxy compound). By containing the polyvalent hydroxy compound, the generation of pyramid-shaped hillock surrounded by the (111) plane on the silicon surface can be suppressed, the silicon surface is not roughened, and the silicon surface can be etched smoothly.
- the polyvalent hydroxy compound has 2 to 12 carbon atoms, preferably 2 to 6 carbon atoms.
- the ratio of the number of hydroxyl groups to the number of carbon atoms in the molecule of a polyvalent hydroxy compound is that hydration progresses due to the hydrogen bond between the hydroxy group and water, and the number of free water molecules that contribute to the reaction decreases. From the viewpoint of smooth etching of silicon, it is preferably 0.3 or more and 1.0 or less, more preferably 0.4 or more and 1.0 or less, and 0.5 or more and 1.0 or less. It is more preferable to have.
- polyvalent hydroxy compound preferably used in the present invention are ethylene glycol, propylene glycol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, and 1,4-.
- the concentration of the polyvalent hydroxy compound is preferably 10% by mass or more and 80% by mass or less, more preferably 20% by mass or more and 80% by mass or less, more preferably 20% by mass, based on the total mass of the etching solution. % Or more and 60% by mass or less are particularly preferable.
- the silicon etching solution of the present invention contains a quaternary ammonium hydroxide represented by the formula (1), a quaternary ammonium salt represented by the formula (2), and a polyvalent hydroxy compound as long as the object of the present invention is not impaired.
- a surfactant or the like may be added.
- the silicon etching solution is substantially composed of the quaternary ammonium hydroxide represented by the formula (1), the quaternary ammonium salt represented by the formula (2), the polyvalent hydroxy compound and water, and is an interface.
- the content of other components such as the activator is preferably 1% by mass or less, and more preferably not contained.
- the entire amount of the balance of the silicon etching solution other than the quaternary ammonium hydroxide represented by the formula (1), the quaternary ammonium salt represented by the formula (2) and the polyvalent hydroxy compound contains water, especially metal impurities. It is preferable that the amount of ultrapure water is reduced.
- the amount of impurities contained in water used as a raw material can be evaluated by the electrical resistivity.
- the electrical resistivity of the water used is preferably 0.1 M ⁇ ⁇ cm or more, and water of 15 M ⁇ ⁇ cm or more. Is more preferable, and 18 M ⁇ ⁇ cm or more is particularly preferable.
- Such water with few impurities can be easily produced and obtained as ultrapure water for semiconductor production. Further, if it is ultrapure water, the number of impurities that do not affect the electrical resistivity (the contribution is small) is remarkably small, and the suitability is high.
- the addition of the polyvalent hydroxy compound promotes hydration by hydrogen bonding and reduces the number of water molecules that can freely contribute to the reaction, so that the concentration of quaternary ammonium hydroxide represented by the above formula (1) is on the low concentration side. Even in this case, it is considered that the generation of pyramid-shaped hillock surrounded by 111 planes can be suppressed. Further, when the ratio (OH / C) of the number of hydroxyl groups to the number of carbon atoms in the molecule of the polyvalent hydroxy compound is high, the hydration amount of hydroxy groups and water per unit mass increases, and the efficiency (111) increases. ) We believe that the occurrence of pyramid-shaped hillock surrounded by a surface can be suppressed.
- the etching rate ratio (100/111) between the (100) plane and the (111) plane of silicon close to 1, and it is 1.9 or less, more preferably 1.8 or less.
- the smoothness can be improved by setting.
- the quaternary ammonium represented by R 11 R 12 R 13 R 14 N + ⁇ OH ⁇ is used, and the quaternary ammonium represented by R 21 R 22 R 23 R 24 N + ⁇ X ⁇ is used.
- Salt is used. Therefore, the ammonium cation (R 11 R 12 R 13 R 14 N + ) and OH ⁇ are derived from the same raw material, and the ammonium cation (R 21 R 22 R 23 R 24 N + ) and X ⁇ are the same.
- the silicon etching solution containing the above components is alkaline.
- the pH is high, specifically, the pH is preferably 10.0 or more, and more preferably 11.0 or more.
- the upper limit is generally 14.0 or less. This pH refers to a value measured at 25 ° C. by the glass electrode method.
- the silicon etching solution of the present invention is a uniform solution in which all the components to be blended are dissolved. Further, it is preferable that the number of particles having a size of 200 nm or more is 100 particles / mL or less, and more preferably 50 particles / mL or less, in order to prevent contamination during etching.
- the amount of metal impurities is as small as possible.
- Ag, Al, Ba, Ca, Cd, Cr, Cu, Fe, K, Li, Mg, Mn, Na, Ni. , Pb and Zn are all preferably 1 ppb or less.
- the method for producing the silicon etching solution according to the first embodiment of the present invention is not particularly limited.
- the quaternary ammonium hydroxide represented by the formula (1), the quaternary ammonium salt represented by the formula (2), and the polyvalent hydroxy compound may be mixed and dissolved with water so as to have a predetermined concentration.
- the quaternary ammonium hydroxide represented by the formula (1) and the polyvalent hydroxy compound may be used as they are, or each may be used as an aqueous solution.
- the quaternary ammonium salt represented by the formula (2) may be used as it is, or may be used as an aqueous solution.
- the silicon etching solution according to the second embodiment of the present invention contains a quaternary ammonium cation represented by the formula (1'), a quaternary ammonium cation represented by the formula (2'), OH ⁇ , and BF. It contains at least one anion selected from the group consisting of 4- , F- , Cl- , and Br-, a polyvalent hydroxy compound having 2 to 12 carbon atoms and having two or more hydroxyl groups in the molecule, and water.
- R 11 , R 12 , R 13 and R 14 are the same as those described in the above formula (1), and their preferred embodiments are also the same.
- Examples of the quaternary ammonium cation represented by the formula (1') include a tetramethylammonium cation (TMA + ), a tetraethylammonium cation (TEA + ), an ethyltrimethylammonium cation (ETMA + ), and a tetrapropylammonium cation (TPA + ).
- TMA + , TEA + , ETMA + , TPA + , and TBA + used in the conventional silicon etching solution consisting of a quaternary ammonium hydroxide aqueous solution can be preferably used.
- TMA + , TEA + , ETMA + , and TPA + because of the high etching rate of silicon.
- the quaternary ammonium cation represented by the formula (1') may be used alone or in combination of two or more.
- R 21 , R 22 , R 23 and R 24 are the same as those described in the above formula (2), and their preferred embodiments are also the same.
- the quaternary ammonium cation represented by the formula (2') pentilt diethylammonium cation, hexyltriethylammonium cation, octyltrimethylammonium cation, decyltrimethylammonium cation, dodecyltrimethylammonium cation, and tetradecyltrimethylammonium cation salt are preferable. Is mentioned as.
- octyltrimethylammonium cations decyltrimethylammonium cations, and dodecyltrimethylammonium cations can be preferably used.
- the quaternary ammonium cation represented by the formula (2') may be used alone or in combination of two or more.
- the polyvalent hydroxy compound having 2 to 12 carbon atoms and having 2 or more hydroxyl groups in the molecule is also the same as that described with respect to the first embodiment, and the preferred embodiment and blending amount thereof are also the same.
- At least one anion selected from the group consisting of BF 4- , F-, Cl- , and Br-, Cl- or Br - is preferable , and Br- is more preferable.
- the content of the quaternary ammonium cation represented by the formula (2') is preferably 0.05 to 1.31 mol / L, more preferably 0.05 to 0.99 mol / L. , 0.05 to 0.50 mol / L, which is particularly preferable.
- concentration of the quaternary ammonium cation represented by the formula (2') in this range, even when the concentration of the quaternary ammonium hydroxide is low, the silicon surface is not roughened and the etching is smooth. Specifically, the surface roughness of the (100) surface of silicon is reduced, and smooth etching is possible by suppressing the pyramid-shaped hillock surrounded by the (111) surface.
- the concentration of the quaternary ammonium cation represented by the formula (1') is not particularly different from that of the conventional silicon etching solution, and when it is in the range of 0.05 to 1.1 mol / L, the solubility is high. A uniform etching solution can be obtained, and an excellent etching effect can be obtained, which is preferable. Further, the concentration of quaternary ammonium is more preferably in the range of 0.05 to 0.6 mol / L. The etching solution of the present invention enables smooth and highly selective etching even in a region where the concentration of quaternary ammonium hydroxide is low.
- the concentration of OH ⁇ is not particularly different from that of the conventional silicon etching solution, and when it is in the range of 0.05 to 1.1 mol / L, a highly soluble and uniform etching solution can be obtained, and excellent etching is performed. The effect is obtained and is preferable. Further, the concentration of OH ⁇ is more preferably in the range of 0.05 to 0.6 mol / L.
- the etching solution of the present invention enables smooth and highly selective etching even in a region where the concentration of quaternary ammonium hydroxide is low.
- the concentration of at least one anion selected from the group consisting of BF 4- , F- , Cl- , and Br- is preferably 0.05 to 1.31 mol / L, more preferably 0.05 to 0.99 mol / L. L, especially in the range of 0.05 to 0.50 mol / L.
- the silicon etching solution according to the second embodiment can also suppress the generation of pyramid-shaped hillock surrounded by 111 surfaces on the silicon surface after silicon etching, similarly to the silicon etching solution according to the first embodiment. ..
- the smoothness can be improved by setting.
- the preferable pH, particle amount, and metal impurity amount of the silicon etching solution according to the second embodiment are also the same as those of the silicon etching solution according to the first embodiment.
- the method for producing the silicon etching solution according to the second embodiment of the present invention is not particularly limited.
- a group selection consisting of a quaternary ammonium cation represented by the formula (1'), a quaternary ammonium cation represented by the formula (2'), OH-, BF 4- , F- , Cl- , and Br-.
- the at least one anion and the polyvalent hydroxy compound may be mixed and dissolved with water so as to have a predetermined concentration.
- filtration and bubbling may be performed as described with respect to the first embodiment, and similar containers and devices can be used.
- the silicon etching solution of the present invention can be used for etching a silicon wafer and / or various silicon composite semiconductor devices including a silicon single crystal film, a polysilicon film and an amorphous silicon film.
- the silicon single crystal film includes those made by epitaxial growth. Therefore, the silicon etching solution of the present invention can be suitably used as the etching solution in the method for manufacturing a silicon device including the steps of etching a silicon wafer, a silicon single crystal film, a polysilicon film, and an amorphous silicon film.
- the substrate processing method according to the first usage mode using the silicon etching solution of the present invention includes a substrate holding step of holding the substrate in a horizontal posture and the substrate being placed around a vertical rotation axis passing through the center of the substrate. It includes a processing liquid supply step of supplying the silicon etching liquid of the present invention to the main surface of the substrate while rotating.
- the substrate processing method according to the second usage mode using the silicon etching solution of the present invention includes a substrate holding step of holding a plurality of substrates in an upright position and an isotropic silicon etching solution of the present invention stored in a processing tank. Includes a step of immersing the substrate in an upright position.
- the silicon etching solution is used for manufacturing a silicon device including a step of supplying a silicon etching solution to smoothly etch a silicon film when etching a semiconductor wafer or a silicon wafer.
- the temperature of the silicon etching solution at the time of etching may be appropriately determined from the range of 20 to 95 ° C. in consideration of the desired etching rate, the shape and surface condition of the silicon after etching, productivity, etc., but 35 to 90 ° C. It is preferable to set it in the range of.
- the object to be etched may be simply immersed in a silicon etching solution, but an electrochemical etching method in which a constant potential is applied to the object to be etched can also be adopted.
- Examples of the object of the etching treatment in the present invention include silicon single crystal, polysilicon, and amorphous silicon, and silicon oxide film, silicon nitride film, and silicon-germanium, which are non-objects that are not the target of the etching treatment, are included in the object.
- a film and various metal films may be included.
- a silicon oxide film, a silicon nitride film, a silicon-germanium film, or a metal film is laminated on a silicon single crystal to form a pattern shape, or a silicon single crystal or polysilicon is formed on the pattern shape. Examples include those made of silicon and structures in which silicon is patterned.
- Tetramethylammonium hydroxide (TMAH) is used as the quaternary ammonium hydroxide represented by the formula (1), and dodecyltrimethylammonium bromide is used as the quaternary ammonium salt represented by the formula (2) as a polyvalent hydroxy compound.
- TMAH Tetramethylammonium hydroxide
- dodecyltrimethylammonium bromide is used as the quaternary ammonium salt represented by the formula (2) as a polyvalent hydroxy compound.
- ethylene glycol a silicon etching solution having the composition shown in Table 1 in which the rest was water was prepared.
- the ionic composition (cations and anions) are also shown.
- a silicon single crystal substrate (100 surfaces) having a size of 2 ⁇ 2 cm was immersed in a silicon etching solution heated to 40 ° C. for 120 minutes, and the etching rate of the silicon single crystal at that temperature was measured.
- the target silicon single crystal substrate is obtained by removing the natural oxide film with a chemical solution.
- the etching rate (R 100 ) measures the weight of the silicon single crystal substrate before and after etching of the silicon single crystal substrate (100 faces), and converts the etching amount of the silicon single crystal substrate from the weight difference before and after the treatment. It was obtained by dividing by the etching time.
- a 2 ⁇ 2 cm size silicon single crystal substrate (111 faces) is immersed for 120 minutes, the etching rate of the silicon single crystal (R 111 ) at that temperature is measured, and etching with the silicon single crystal substrate (100 faces) is performed.
- the speed ratio (R 100 / R 111 ) was determined.
- FE-SEM field emission scanning electron microscope
- Table 1 ⁇ FE-SEM observation results of silicon single crystal substrate (100 faces)> Measurement 1: Three arbitrary places were selected at an observation magnification of 20,000 times, and a 50 ⁇ m square was observed to check for the presence or absence of hillock. 5 / Hillock is not observed in the observation field. 3 / Slightly minute hillock is observed in the observation field. 0 / Many hillocks are observed in the observation field. Measurement 2: Three arbitrary places were selected at an observation magnification of 100,000 times, 1 ⁇ m square was observed, and the protrusions were hillocks, and the number was examined.
- TMAH Tetramethylammonium Hydroxide
- TEAH Tetraethylammonium Hydroxide
- ETMAH Ethyltrimethylammonium Hydroxide
- TPAH Tetrapropylammonium Hydroxide
- TBAH Tetrabutylammonium Hydroxide
- TMA + Tetramethylammonium Cation
- TEA + Tetraethylammonium Cation
- ETMA + Ethyltrimethylammonium cation
- TPA + Tetrapropylammonium cation
- TBA + Tetrabutylammonium cation
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Weting (AREA)
- Photovoltaic Devices (AREA)
Abstract
Description
R11R12R13R14N+・OH- (1)
(式中、R11、R12、R13およびR14は、それぞれ独立に、アリール基、ベンジル基、または炭素数1~4のアルキル基であり、当該アルキル基、アリール基、またはベンジル基は、ヒドロキシ基を有していてもよい。)
で示される水酸化第四級アンモニウム、
下記式(2)
R21R22R23R24N+・X- (2)
(式中、R21、R22、R23およびR24は、一つは置換基を有していてもよい炭素数16以下のアルキル基であり、残る三つは炭素数1または2のアルキル基であり、当該炭素数16以下のアルキル基および炭素数1または2のアルキル基はヒドロキシ基を有していてもよい。Xは、BF4、フッ素原子、塩素原子、および臭素原子からなる群から選ばれる少なくとも一つである。)
で示され、かつ炭素の総数が11~20個である第四級アンモニウム塩、
炭素数2~12であって、分子中に水酸基を2以上有する多価ヒドロキシ化合物、および水を含み、前記式(2)で示される第四級アンモニウム塩の濃度が1.5~50質量%である、シリコンエッチング液。
炭素数2~12の、分子中に水酸基を2以上有する多価ヒドロキシ化合物の濃度が10~80質量%である、[1]に記載のシリコンエッチング液。
R11R12R13R14N+ (1’)
(式中、R11、R12、R13およびR14は、それぞれ独立に、アリール基、ベンジル基、または炭素数1~4のアルキル基であり、当該アルキル基、アリール基、またはベンジル基は、ヒドロキシ基を有していてもよい。)
で示される第四級アンモニウムカチオンと、
下記式(2’)
R21R22R23R24N+ (2’)
(式中、R21、R22、R23およびR24は、一つは置換基を有していてもよい炭素数16以下のアルキル基であり、残る三つは炭素数1または2のアルキル基であり、当該炭素数16以下のアルキル基および炭素数1または2のアルキル基はヒドロキシ基を有していてもよい。)
で示され、かつ炭素の総数が11~20個である第四級アンモニウムカチオンと、
OH-と、
BF4 -、F-、Cl-、およびBr-からなる群から選ばれる少なくとも一つのアニオンと、
炭素数2~12であって、分子中に水酸基を2以上有する多価ヒドロキシ化合物と、
水とを含み、
前記式(2’)で示される第四級アンモニウムカチオンの含有量が0.05~1.31モル/Lであり、かつアルカリ性であるシリコンエッチング液。
OH-の濃度が0.05~1.1モル/L、
BF4 -、F-、Cl-、Br-から選ばれる少なくとも一つのアニオンの濃度が0.05~1.31モル/L、
炭素数2~12の、分子中に水酸基を2以上有する多価ヒドロキシ化合物の濃度が10~80質量%である、[3]に記載のシリコンエッチング液。
本発明の第1の実施形態に係るシリコンエッチング液は、式(1)で示される水酸化第四級アンモニウム、式(2)で示される第四級アンモニウム塩、炭素数2~12の、分子中に水酸基を2以上有する多価ヒドロキシ化合物、および水を含む。
R11R12R13R14N+・OH- (1)
R21R22R23R24N+・X- (2)
本発明の第1の実施形態に係るシリコンエッチング液の製造方法は特に制限されない。式(1)で示される水酸化第四級アンモニウムと式(2)で示される第四級アンモニウム塩と多価ヒドロキシ化合物とを所定濃度となるように水と混合、溶解すればよい。式(1)で示される水酸化第四級アンモニウムと多価ヒドロキシ化合物はそのまま使用してもよいし、それぞれを水溶液として使用してもよい。式(2)で示される第四級アンモニウム塩をそのまま使用してもよいし、水溶液として使用してもよい。更には、式(2)で示される第四級アンモニウム塩の代わりに、下記式(2-1)
R21R22R23R24N+・OH- (2-1)
(式中、R21、R22、R23およびR24は、式(2)におけるものと同義である。)で示される第四級アンモニウム水酸化物を使用して、式(1)で示される水酸化第四級アンモニウムと式(2-1)で示される第四級アンモニウム水酸化物とを含む水溶液とした後に、該水溶液にHX(Xは式(2)におけるものと同義である。)で示される酸を適量加えることによっても製造することができる。
水酸化第四級アンモニウムおよび第四級アンモニウム塩は、エッチング液中では解離するため、第1の実施形態において原料としてアニオンを入れ替えたR11R12R13R14N+・X-およびR21R22R23R24N+・OH-を用いても結果として同一組成のシリコンエッチング液を得ることは可能である。
R11R12R13R14N+ (1’)
R21R22R23R24N+ (2’)
本発明の第2の実施形態に係るシリコンエッチング液の製造方法は特に制限されない。式(1’)で示される第四級アンモニウムカチオンと、式(2’)で示される第四級アンモニウムカチオンと、OH-と、BF4 -、F-、Cl-、Br-からなる群選ばれる少なくとも一つのアニオンと、多価ヒドロキシ化合物とを所定濃度となるように水と混合、溶解すればよい。
R11R12R13R14N+・OH- (1)
R11R12R13R14N+・X- (1a)
R21R22R23R24N+・X- (2)
R21R22R23R24N+・OH- (2a)
上式中、R11、R12、R13、R14、R21、R22、R23、R24およびXは、前記と同様である。
本発明のシリコンエッチング液は、シリコンウェハ、および/またはシリコン単結晶膜、ポリシリコン膜およびアモルファスシリコン膜を含む各種シリコン複合半導体デバイスのエッチング処理に用いることができる。なお、シリコン単結晶膜は、エピタキシャル成長によって作られたものを含む。従って、シリコンウェハ、シリコン単結晶膜、ポリシリコン膜、アモルファスシリコン膜をエッチングする工程を含むシリコンデバイスの製造方法におけるエッチング液として、本発明のシリコンエッチング液を好適に用いることができる。
式(1)で示される水酸化第四級アンモニウムとしてテトラメチルアンモニウムハイドロオキサイド(TMAH)を用い、式(2)で示される第四級アンモニウム塩としてドデシルトリメチルアンモニウムブロミドを用い、多価ヒドロキシ化合物としてエチレングリコールを用い、残りが水である表1に示す組成のシリコンエッチング液を調製した。イオン組成(カチオンおよびアニオン)を合わせて示す。
40℃に加熱したシリコンエッチング液に2×2cmサイズのシリコン単結晶基板(100面)を120分間浸漬し、その温度でのシリコン単結晶のエッチング速度を測定した。対象のシリコン単結晶基板は、薬液にて自然酸化膜を除去したものである。エッチング速度(R100)は、シリコン単結晶基板(100面)のエッチング前とエッチング後のシリコン単結晶基板の重量を測定し、処理前後の重量差からシリコン単結晶基板のエッチング量を換算し、エッチング時間で除することにより求めた。同様に2×2cmサイズのシリコン単結晶基板(111面)を120分間浸漬し、その温度でのシリコン単結晶のエッチング速度(R111)を測定し、シリコン単結晶基板(100面)とのエッチング速度比(R100/R111)を求めた。
<シリコン単結晶基板(100面)のFE-SEM観察結果>
測定1:観察倍率2万倍で任意の場所を3カ所選び、50μm角を観察し、ヒロックの有無を調べた。
5/観察視野でヒロックが観察されない。
3/観察視野にわずかに微小なヒロックが観察される。
0/観察視野にヒロックが多数観察される。
測定2:観察倍率10万倍で任意の場所を3カ所選び、1μm角を観察し、突起物をヒロックとし、その数を調べた。
40℃に加熱したシリコンエッチング液にシリコン酸化膜、およびシリコン窒化膜を10分間浸漬し、その温度でのシリコン酸化膜、およびシリコン窒化膜のエッチング速度を測定した。エッチング速度は、シリコン酸化膜、およびシリコン窒化膜のエッチング前とエッチング後の膜厚を分光エリプソメーターで測定し、処理前後の膜厚差からシリコン酸化膜、およびシリコン窒化膜のエッチング量を換算し、エッチング時間で除することにより求めた。次に、シリコン単結晶基板(100面)とのエッチング速度比(R100/シリコン酸化膜)、(R100/シリコン窒化膜)を算出し、下記の基準で評価した。結果を表1に示す。
シリコン単結晶とシリコン酸化膜との選択比(Si(100面)/SiO2)
A:1000以上 B:700以上1000未満 C:500以上700未満 D:500未満
シリコン単結晶と窒化シリコン膜との選択比(Si(100面)/SiN)
A:1000以上 B:700以上1000未満 C:500以上700未満 D:500未満
シリコンエッチング液として表1および表2に示す組成のシリコンエッチング液を用いた以外、実施例1と同様にして評価した。結果を表1および表2に示す。
TMAH:テトラメチルアンモニウムハイドロオキサイド
TEAH:テトラエチルアンモニウムハイドロオキサイド
ETMAH:エチルトリメチルアンモニウムハイドロオキサイド
TPAH:テトラプロピルアンモニウムハイドロオキサイド
TBAH:テトラブチルアンモニウムハイドロオキサイド
TMA+:テトラメチルアンモニウムカチオン
TEA+:テトラエチルアンモニウムカチオン
ETMA+:エチルトリメチルアンモニウムカチオン
TPA+:テトラプロピルアンモニウムカチオン
TBA+:テトラブチルアンモニウムカチオン
Claims (6)
- 下記式(1)
R11R12R13R14N+・OH- (1)
(式中、R11、R12、R13およびR14は、それぞれ独立に、アリール基、ベンジル基、または炭素数1~4のアルキル基であり、当該アルキル基、アリール基、またはベンジル基は、ヒドロキシ基を有していてもよい。)
で示される水酸化第四級アンモニウム、
下記式(2)
R21R22R23R24N+・X- (2)
(式中、R21、R22、R23およびR24は、一つは置換基を有していてもよい炭素数16以下のアルキル基であり、残る三つは炭素数1または2のアルキル基であり、当該炭素数16以下のアルキル基および炭素数1または2のアルキル基はヒドロキシ基を有していてもよい。Xは、BF4、フッ素原子、塩素原子、および臭素原子からなる群から選ばれる少なくとも1つである。)
で示され、かつ炭素の総数が11~20個である第四級アンモニウム塩、
炭素数2~12であって、分子中に水酸基を2以上有する多価ヒドロキシ化合物、および水を含み、前記式(2)で示される第四級アンモニウム塩の濃度が1.5~50質量%である、シリコンエッチング液。 - 式(1)で示される水酸化第四級アンモニウムの濃度が0.05~1.1モル/L、
炭素数2~12の、分子中に水酸基を2以上有する多価ヒドロキシ化合物の濃度が10~80質量%である、請求項1に記載のシリコンエッチング液。 - 下記式(1’)
R11R12R13R14N+ (1’)
(式中、R11、R12、R13およびR14は、それぞれ独立に、アリール基、ベンジル基、または炭素数1~4のアルキル基であり、当該アルキル基、アリール基、またはベンジル基は、ヒドロキシ基を有していてもよい。)
で示される第四級アンモニウムカチオンと、
下記式(2’)
R21R22R23R24N+ (2’)
(式中、R21、R22、R23およびR24は、一つは置換基を有していてもよい炭素数16以下のアルキル基であり、残る三つは炭素数1または2のアルキル基であり、当該炭素数16以下のアルキル基および炭素数1または2のアルキル基はヒドロキシ基を有していてもよい。)
で示され、かつ炭素の総数が11~20個である第四級アンモニウムカチオンと、
OH-と、
BF4 -、F-、Cl-、およびBr-からなる群から選ばれる少なくとも一つのアニオンと、
炭素数2~12であって、分子中に水酸基を2以上有する多価ヒドロキシ化合物と、
水とを含み、
前記式(2’)で示される第四級アンモニウムカチオンの含有量が0.05~1.31モル/Lであり、かつアルカリ性であるシリコンエッチング液。 - 式(1’)で示される第四級アンモニウムカチオンの濃度が0.05~1.1モル/L、
OH-の濃度が0.05~1.1モル/L、
BF4 -、F-、Cl-、Br-から選ばれる少なくとも一つのアニオンの濃度が0.05~1.31モル/L、
炭素数2~12の、分子中に水酸基を2以上有する多価ヒドロキシ化合物の濃度が10~80質量%である、請求項3に記載のシリコンエッチング液。 - 請求項1~4の何れか1項に記載のシリコンエッチング液を用いてシリコンウェハをエッチングする、または、シリコン単結晶膜、ポリシリコン膜およびアモルファスシリコン膜から成る群から選択される少なくとも1種を含む基板をエッチングする、シリコンウェハおよび/または基板の処理方法。
- シリコンウェハ、シリコン単結晶膜、ポリシリコン膜およびアモルファスシリコン膜から成る群から選択される少なくとも1種をエッチングする工程を含むシリコンデバイスの製造方法において、該エッチングを請求項1~4の何れか1項に記載のシリコンエッチング液を用いて行うシリコンデバイスの製造方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020237020509A KR20230122597A (ko) | 2020-12-24 | 2021-12-22 | 실리콘 에칭액, 그 에칭액을 사용한 실리콘 디바이스의 제조 방법 및 기판 처리 방법 |
US18/268,794 US20240124775A1 (en) | 2020-12-24 | 2021-12-22 | Silicon etching liquid, and method for producing silicon devices and method for processing substrates, each using said etching liquid |
JP2022571577A JPWO2022138754A1 (ja) | 2020-12-24 | 2021-12-22 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020215648 | 2020-12-24 | ||
JP2020-215648 | 2020-12-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022138754A1 true WO2022138754A1 (ja) | 2022-06-30 |
Family
ID=82156952
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/047675 WO2022138754A1 (ja) | 2020-12-24 | 2021-12-22 | シリコンエッチング液、該エッチング液を用いたシリコンデバイスの製造方法および基板処理方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20240124775A1 (ja) |
JP (1) | JPWO2022138754A1 (ja) |
KR (1) | KR20230122597A (ja) |
TW (1) | TW202231843A (ja) |
WO (1) | WO2022138754A1 (ja) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006186329A (ja) * | 2004-11-30 | 2006-07-13 | Tokuyama Corp | シリコンエッチング液 |
JP2013135081A (ja) * | 2011-12-26 | 2013-07-08 | Fujifilm Corp | シリコンエッチング方法、これに用いられるシリコンエッチング液、及びそのキット |
JP2019050365A (ja) * | 2017-08-25 | 2019-03-28 | バーサム マテリアルズ ユーエス,リミティド ライアビリティ カンパニー | 半導体デバイスの製造中にシリコン−ゲルマニウム/シリコン積層体からシリコン−ゲルマニウム合金を選択的に除去するためのエッチング液 |
JP2019050364A (ja) * | 2017-08-25 | 2019-03-28 | バーサム マテリアルズ ユーエス,リミティド ライアビリティ カンパニー | 半導体デバイスの製造中にシリコン−ゲルマニウム/シリコン積層体からシリコン−ゲルマニウム合金に対してシリコンを選択的に除去するためのエッチング液 |
JP2020126997A (ja) * | 2019-02-05 | 2020-08-20 | 株式会社トクヤマ | シリコンエッチング液及び該エッチング液を用いたシリコンデバイスの製造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5339880B2 (ja) | 2008-12-11 | 2013-11-13 | 株式会社新菱 | シリコン基板のエッチング液およびシリコン基板の表面加工方法 |
JP5869368B2 (ja) | 2011-03-04 | 2016-02-24 | 富士フイルム株式会社 | キャパシタ構造の形成方法及びこれに用いられるシリコンエッチング液 |
JP2012227304A (ja) | 2011-04-19 | 2012-11-15 | Hayashi Junyaku Kogyo Kk | エッチング液組成物およびエッチング方法 |
US9873833B2 (en) | 2014-12-29 | 2018-01-23 | Versum Materials Us, Llc | Etchant solutions and method of use thereof |
CN114706271A (zh) | 2016-03-31 | 2022-07-05 | 富士胶片株式会社 | 半导体制造用处理液及图案形成方法 |
-
2021
- 2021-12-22 WO PCT/JP2021/047675 patent/WO2022138754A1/ja active Application Filing
- 2021-12-22 KR KR1020237020509A patent/KR20230122597A/ko unknown
- 2021-12-22 JP JP2022571577A patent/JPWO2022138754A1/ja active Pending
- 2021-12-22 US US18/268,794 patent/US20240124775A1/en active Pending
- 2021-12-23 TW TW110148356A patent/TW202231843A/zh unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006186329A (ja) * | 2004-11-30 | 2006-07-13 | Tokuyama Corp | シリコンエッチング液 |
JP2013135081A (ja) * | 2011-12-26 | 2013-07-08 | Fujifilm Corp | シリコンエッチング方法、これに用いられるシリコンエッチング液、及びそのキット |
JP2019050365A (ja) * | 2017-08-25 | 2019-03-28 | バーサム マテリアルズ ユーエス,リミティド ライアビリティ カンパニー | 半導体デバイスの製造中にシリコン−ゲルマニウム/シリコン積層体からシリコン−ゲルマニウム合金を選択的に除去するためのエッチング液 |
JP2019050364A (ja) * | 2017-08-25 | 2019-03-28 | バーサム マテリアルズ ユーエス,リミティド ライアビリティ カンパニー | 半導体デバイスの製造中にシリコン−ゲルマニウム/シリコン積層体からシリコン−ゲルマニウム合金に対してシリコンを選択的に除去するためのエッチング液 |
JP2020126997A (ja) * | 2019-02-05 | 2020-08-20 | 株式会社トクヤマ | シリコンエッチング液及び該エッチング液を用いたシリコンデバイスの製造方法 |
Also Published As
Publication number | Publication date |
---|---|
TW202231843A (zh) | 2022-08-16 |
US20240124775A1 (en) | 2024-04-18 |
KR20230122597A (ko) | 2023-08-22 |
JPWO2022138754A1 (ja) | 2022-06-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4815406B2 (ja) | シリコン酸化膜選択性湿式エッチング溶液及びエッチング方法 | |
JP6420903B2 (ja) | エッチング液組成物、多層膜のエッチング方法、並びに表示装置の製造方法 | |
JP5339880B2 (ja) | シリコン基板のエッチング液およびシリコン基板の表面加工方法 | |
CN108121149A (zh) | TiN硬掩模和蚀刻残留物去除 | |
JP5430924B2 (ja) | 半導体ウエハ研磨用組成物 | |
JP2004123921A (ja) | 研磨用組成物 | |
TWI721311B (zh) | 於製造一半導體裝置時用於相對氮化鈦選擇性移除氮化鉭的蝕刻組合物 | |
JP7531047B2 (ja) | タングステン膜に対する窒化チタン膜のエッチング選択比を調節するためのエッチング液組成物、及びこれを用いたエッチング方法 | |
CN108203830B (zh) | 金属线蚀刻液组合物 | |
JP2021086943A (ja) | エッチング液 | |
WO2012023613A1 (ja) | テクスチャー形成用組成物、シリコン基板の製造方法、及びテクスチャー形成用組成物調製キット | |
JP7096799B2 (ja) | エッチング液 | |
WO2022138754A1 (ja) | シリコンエッチング液、該エッチング液を用いたシリコンデバイスの製造方法および基板処理方法 | |
JP2015189829A (ja) | 研磨用組成物 | |
JP6373029B2 (ja) | 研磨用組成物 | |
JP7363078B2 (ja) | 底部反射防止膜の除去液、及び半導体素子の製造方法 | |
WO2022025163A1 (ja) | シリコンエッチング液、並びに該エッチング液を用いたシリコンデバイスの製造方法およびシリコン基板の処理方法 | |
WO2022025161A1 (ja) | シリコンエッチング液、並びに該エッチング液を用いたシリコンデバイスの製造方法およびシリコン基板の処理方法 | |
WO2023223936A1 (ja) | 窒化ケイ素エッチング液組成物 | |
TWI522753B (zh) | 光阻脫除組合物和電子元件的製造方法 | |
TWI765175B (zh) | 蝕刻液 | |
JP2024075502A (ja) | シリコンエッチング液、基板の処理方法およびシリコンデバイスの製造方法 | |
KR20240076737A (ko) | 실리콘 에칭액, 기판의 처리 방법 및 실리콘 디바이스의 제조 방법 | |
JP2024034694A (ja) | シリコンエッチング液 | |
CN118421318A (zh) | 用于蚀刻硅和硅锗的蚀刻剂组合物和使用其的图案的制备方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21910894 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2022571577 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18268794 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21910894 Country of ref document: EP Kind code of ref document: A1 |