WO2017052280A1 - Cmp용 슬러리 조성물 및 이를 이용한 연마방법 - Google Patents
Cmp용 슬러리 조성물 및 이를 이용한 연마방법 Download PDFInfo
- Publication number
- WO2017052280A1 WO2017052280A1 PCT/KR2016/010681 KR2016010681W WO2017052280A1 WO 2017052280 A1 WO2017052280 A1 WO 2017052280A1 KR 2016010681 W KR2016010681 W KR 2016010681W WO 2017052280 A1 WO2017052280 A1 WO 2017052280A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cmp
- polishing
- slurry composition
- film
- silicon nitride
- Prior art date
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- 238000005498 polishing Methods 0.000 title claims abstract description 112
- 239000002002 slurry Substances 0.000 title claims abstract description 109
- 239000000203 mixture Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 52
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 82
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 81
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 81
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims abstract description 71
- 229920005591 polysilicon Polymers 0.000 claims abstract description 70
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 66
- 239000004065 semiconductor Substances 0.000 claims abstract description 22
- 239000000654 additive Substances 0.000 claims description 61
- 230000000996 additive effect Effects 0.000 claims description 51
- 239000002202 Polyethylene glycol Substances 0.000 claims description 25
- 229920001223 polyethylene glycol Polymers 0.000 claims description 25
- 150000002391 heterocyclic compounds Chemical class 0.000 claims description 24
- 239000008119 colloidal silica Substances 0.000 claims description 15
- 239000002904 solvent Substances 0.000 claims description 14
- 229920003169 water-soluble polymer Polymers 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 9
- LRUDIIUSNGCQKF-UHFFFAOYSA-N 5-methyl-1H-benzotriazole Chemical compound C1=C(C)C=CC2=NNN=C21 LRUDIIUSNGCQKF-UHFFFAOYSA-N 0.000 claims description 8
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 claims description 7
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 claims description 7
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 150000007524 organic acids Chemical class 0.000 description 23
- 239000000463 material Substances 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 6
- 238000007517 polishing process Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 5
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 235000005985 organic acids Nutrition 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- AEJARLYXNFRVLK-UHFFFAOYSA-N 4H-1,2,3-triazole Chemical compound C1C=NN=N1 AEJARLYXNFRVLK-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 2
- OVYQSRKFHNKIBM-UHFFFAOYSA-N butanedioic acid Chemical compound OC(=O)CCC(O)=O.OC(=O)CCC(O)=O OVYQSRKFHNKIBM-UHFFFAOYSA-N 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- YVSCCMNRWFOKDU-UHFFFAOYSA-N hexanedioic acid Chemical compound OC(=O)CCCCC(O)=O.OC(=O)CCCCC(O)=O YVSCCMNRWFOKDU-UHFFFAOYSA-N 0.000 description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 125000004433 nitrogen atom Chemical group N* 0.000 description 2
- YKEKYBOBVREARV-UHFFFAOYSA-N pentanedioic acid Chemical compound OC(=O)CCCC(O)=O.OC(=O)CCCC(O)=O YKEKYBOBVREARV-UHFFFAOYSA-N 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000013077 target material Substances 0.000 description 2
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 2
- 150000003536 tetrazoles Chemical class 0.000 description 2
- -1 that is Chemical compound 0.000 description 2
- GIWQSPITLQVMSG-UHFFFAOYSA-N 1,2-dimethylimidazole Chemical compound CC1=NC=CN1C GIWQSPITLQVMSG-UHFFFAOYSA-N 0.000 description 1
- OHVLMTFVQDZYHP-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CN1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O OHVLMTFVQDZYHP-UHFFFAOYSA-N 0.000 description 1
- KZEVSDGEBAJOTK-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[5-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CC=1OC(=NN=1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O KZEVSDGEBAJOTK-UHFFFAOYSA-N 0.000 description 1
- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001412 amines Chemical group 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 150000003009 phosphonic acids Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- 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
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
-
- 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
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- 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
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
-
- 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
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
-
- 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
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/32115—Planarisation
- H01L21/3212—Planarisation by chemical mechanical polishing [CMP]
Definitions
- the to-be-polished surface in CMP exposes various materials, such as a polysilicon film (polycrystalline silicon film), a single crystal silicon film, a silicon oxide film, and a silicon nitride film.
- the target material was removed by CMP using the slurry composition for CMP which targeted 1 type of said materials.
- the targeted material may be excessively polished, causing defects such as dishing and erosion.
- productivity is lowered because a slurry composition for CMP suitable for each object must be selected for each target material and removed by CMP.
- the additive may be made of polyethylene glycol having a selectivity control with respect to the polysilicon film, a heterocyclic compound and an organic acid with a selectivity control with respect to the silicon nitride film. have.
- the polishing rate for the polysilicon film can be greatly reduced by the characteristics of the powder phase emulsifier as a nonionic surfactant.
- the content of the heterocyclic compound and the organic acid as the additive is increased, sedimentation and aggregation are performed. Along with the characteristic of suppressing this, the polishing rate for the silicon nitride film can be increased.
- the slurry composition for CMP is 0.2 to 10% by weight of the abrasive, consisting of colloidal silica, 0.001 to 7% by weight of one or more additives selected from the group consisting of polyethylene glycol, heterocyclic compounds and organic acids, and the rest It may be to include a solvent.
- the abrasive composed of colloidal silica that is, colloidal silica, preferably comprises 0.2 to 10% by weight relative to the total weight of the composition. If colloidal silica is used at less than 0.2% by weight, it is not preferable because the removal rate is reduced due to the lack of solid content, and when used in excess of 10% by weight, aggregation occurs due to excessive content.
- the one or more additives selected from the group consisting of polyethylene glycol, heterocyclic compounds and organic acids preferably comprise 0.001 to 7% by weight, based on the total weight of the composition. If the additive is used at less than 0.001% by weight, the additive content is low and there is little effect on the additive. When the additive is used at an amount exceeding 7% by weight, the additive is contained in an excess amount so that other additives added together do not play a role. It is not desirable because it is not.
- the slurry composition for CMP may further include a water-soluble polymer capable of controlling the selectivity with respect to the silicon nitride film.
- the water-soluble polymer may be selected from one or more selected from the group consisting of polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid and hydroxyethyl cellulose.
- the water-soluble polymer preferably contains 0.001 to 5% by weight of the water-soluble polymer, based on the total weight of the composition. If the water-soluble polymer is used at less than 0.001% by weight, the additive content is low and there is little effect on the additive. When the water-soluble polymer is used at more than 5% by weight, other additives added together do not play a role. Not.
- Another embodiment of the present invention may be to provide a polishing method using the slurry composition for CMP comprising the step of polishing the semiconductor wafer using the CMP slurry composition.
- the polishing method may be one in which the abrasive and the additive are injected, respectively, to adjust the selectivity of the silicon oxide film, the silicon nitride film and the polysilicon film by controlling the content of the additive.
- An example of the polishing method using the CMP slurry composition is as follows. As can be seen in the schematic diagram showing the polishing of the pad and wafer of the CMP equipment as shown in FIG. 1, first, the CMP slurry composition is supplied to the polishing pad on the polishing surface, and the contact surface to be polished and the polishing surface and the polishing pad are Move to polish.
- the general polishing apparatus which has the holder which hold
- As the polishing pad a general nonwoven fabric, expanded polyurethane, porous fluororesin, or the like can be used.
- the silicon oxide film is best polished, but the CMP slurry composition according to the present invention can polish the silicon oxide film, the silicon nitride film, and the polysilicon film with a high polishing selectivity, so that the polysilicon film, the silicon nitride film, It can be usefully applied to a semiconductor manufacturing process having a to-be-polished surface formed of three kinds of silicon oxide films. Since the CMP slurry composition as described above does not need to select each slurry suitable for the object for each polishing object, the production efficiency can be improved.
- FIG. 2 A method of polishing a silicon nitride film according to an embodiment of the present invention is shown in FIG. 2.
- the silicon nitride film may be selectively polished by increasing the polishing selectivity of the silicon nitride film with respect to the silicon film or silicon oxide film.
- silicon oxide film: polysilicon film: silicon nitride film 1: 1: 50)
- FIG. 3 is a slurry composition for CMP prepared from the present invention is that the additive is included in the abrasive, as the structure of Figure 3 after polishing the silicon nitride film and polysilicon film after the various processes, the additive polyethylene glycol, When a heterocyclic compound and an organic acid are added at a ratio of 0 to 5.0: 0 to 5.0: 0 to 5.0, a slurry having a low selectivity for the silicon oxide film and a high selectivity for the silicon nitride film and the polysilicon film can be used.
- the silicon oxide film is not polished well, but the silicon nitride film and polysilicon film are polished well, and the CMP process is carried out.
- One side of the two trench structures is filled with polysilicon film.
- the structure can be obtained and other trench structures can be obtained in the form of structures filled with silicon nitride.
- a slurry composition for CMP was prepared in the same manner as in Example 1 except for the type of additive, the amount of the abrasive additive, and the solvent in Example 1.
- the slurry content contained in the prepared slurry composition for CMP is shown in Table 1 below.
- Example 1 Colloidal silica (% by weight) Additive (% by weight) pH Polyethylene glycol Organic acid (glutaric acid) Heterocyclic Compounds (5methyl-benzotriazole)
- Example 2 0.5 0.025 0.05 3.5
- Example 2 0.4 0.025 0.025 3.5
- Example 3 2 0.4 0.025 - 3.5
- Example 4 2 0.45 0.025 0.025 3.5
- Example 5 1.5 0.5 0.025 0.05 3.5
- Example 6 2 0.2 0.025 - 3.5
- Example 7 2 - 0.025 - 3.5
- Example 8 2.5 0.8 0.025 - 3.5
- Example 9 3.0 1.0 0.5 0.025 3.5
- Example 10 3.5 1.4 1.0 0.025 3.5
- polishing rates of the silicon oxide film, the silicon nitride film and the polysilicon film were evaluated using the CMP slurry compositions prepared in Examples 1 to 10. At this time, the polishing equipment used CMP equipment of CTS (CTS).
- CTS CTS
- Table 2 shows the results of measuring polishing rates of the silicon oxide film, the silicon nitride film, and the polysilicon film using the CMP slurry composition.
- Examples 1 to 10 confirmed that the polishing selectivity of the silicon nitride film and the polysilicon film to the silicon oxide film is increased.
- the polishing selectivity of the silicon nitride film with respect to the silicon oxide film was all significantly increased to 1:10 or more.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
콜로이달실리카(중량%) | 첨가제(중량%) | pH | |||
폴리에틸렌글리콜 | 유기산(글루타르산) | 헤테로고리화합물(5메틸-벤조트리아졸) | |||
실시예 1 | 2 | 0.5 | 0.025 | 0.05 | 3.5 |
실시예 2 | 2 | 0.4 | 0.025 | 0.025 | 3.5 |
실시예 3 | 2 | 0.4 | 0.025 | - | 3.5 |
실시예 4 | 2 | 0.45 | 0.025 | 0.025 | 3.5 |
실시예 5 | 1.5 | 0.5 | 0.025 | 0.05 | 3.5 |
실시예 6 | 2 | 0.2 | 0.025 | - | 3.5 |
실시예 7 | 2 | - | 0.025 | - | 3.5 |
실시예 8 | 2.5 | 0.8 | 0.025 | - | 3.5 |
실시예 9 | 3.0 | 1.0 | 0.5 | 0.025 | 3.5 |
실시예 10 | 3.5 | 1.4 | 1.0 | 0.025 | 3.5 |
제거율(=연마 속도, Å/min) | 선택비(실리콘산화막: 실리콘질화막: 폴리실리콘막) | |||
실리콘산화막 | 실리콘질화막 | 폴리실리콘막 | ||
실시예 1 | 30 | 550 | 100 | 1 : 18.3 : 3.3 |
실시예 2 | 30 | 550 | 109 | 1 : 18.3 : 3.6 |
실시예 3 | 30 | 600 | 150 | 1 : 20.0 : 5.0 |
실시예 4 | 50 | 600 | 150 | 1 : 12.0 : 3.0 |
실시예 5 | 50 | 500 | 150 | 1 : 10.0 : 3.0 |
실시예 6 | 50 | 600 | 450 | 1 : 12.0 : 9.0 |
실시예 7 | 40 | 600 | 886 | 1 : 15.0 : 22.2 |
실시예 8 | 50 | 500 | 100 | 1 : 10 : 2 |
실시예 9 | 50 | 600 | 70 | 1 : 12 :1.4 |
실시예 10 | 50 | 750 | 50 | 1 : 15 :1 |
Claims (11)
- 실리콘산화막, 실리콘질화막 및 폴리실리콘막에 대한 선택비를 조절하여 연마할 수 있도록,콜로이달실리카로 이루어진 연마재 0.2 내지 10 중량%;A: 글루타르산 및 5-메틸벤조트리아졸을 포함하며, B: 폴리에틸렌글리콜을 선택적으로 포함하는 첨가제 0.001 내지 7 중량%; 및나머지는 용매를 포함하되,상기 첨가제는 폴리에틸렌글리콜, 5-메틸벤조트리아졸 및 글루타르산의 비율이 0 ~ 5.0 : 0 ~ 5.0 : 0 ~ 5.0이고, 상기 글루타르산 및 5-메틸벤조트리아졸은 각각 0을 초과하는 비율이며,상기 연마는 실리콘산화막, 실리콘질화막 및 폴리실리콘막의 연마 선택비가 1:10~20:1~22.2인 것을 특징으로 하는 CMP용 슬러리 조성물.
- 제1항에 있어서, 상기 콜로이달실리카는 입자 크기가 10 내지 120nm인 것을 특징으로 하는 CMP용 슬러리 조성물.
- 제1항에 있어서, 상기 첨가제는 폴리실리콘막에 대하여 선택비 조절이 가능한 폴리에틸렌글리콜과 실리콘질화막에 대하여 선택비 조절이 가능한 5-메틸벤조트리아졸 및 글루타르산으로 이루어진 것을 특징으로 하는 CMP용 슬러리 조성물.
- 제1항에 있어서, 상기 CMP용 슬러리 조성물은 수용성 고분자를 추가적으로 더 포함하는 것을 특징으로 하는 CMP용 슬러리 조성물.
- 제8항에 있어서, 상기 수용성 고분자는 폴리비닐알코올, 폴리비닐피롤리돈, 폴리아크릴산 및 히드록시에틸셀룰로오스로 이루어진 군으로부터 선택되는 1종 이상인 것을 선택할 수 있으며, 조성물 총 중량에 대하여, 수용성 고분자 0.001 내지 5 중량%를 포함하는 것을 특징으로 하는 CMP용 슬러리 조성물.
- 제1항에 있어서, 상기 CMP용 슬러리 조성물은 pH가 3 내지 5인 것을 특징으로 하는 CMP용 슬러리 조성물.
- 제1항에 있어서, 상기 CMP용 슬러리 조성물은 실리콘산화막, 실리콘질화막 및 폴리실리콘막 중에서 선택되는 2종 이상으로 형성되는 피연마막을 동시에 연마하는 것을 특징으로 하는 CMP용 슬러리 조성물.
- 제1항에 있어서, 상기 CMP용 슬러리 조성물은 연마재에 첨가제를 포함시켜 단일 슬러리로 사용하는 것을 특징으로 하는 CMP용 슬러리 조성물.
- 제1항, 제2항, 제3항, 제4항, 제5항, 제6항, 제7항 및 제8항 중 어느 한 항의 CMP 슬러리 조성물을 사용하여 반도체 웨이퍼를 연마하는 단계를 포함하는 것을 특징으로 하는 CMP용 슬러리 조성물을 이용한 연마방법.
- 제9항에 있어서, 상기 연마방법은 연마재와 첨가제가 각각 주입되어, 첨가제의 함량 조절을 통해 실리콘산화막, 실리콘질화막 및 폴리실리콘막의 선택비를 조절하여 연마하는 것을 특징으로 하는 CMP용 슬러리 조성물을 이용한 연마방법.
- 제9항에 있어서, 상기 첨가제는 폴리에틸렌글리콜의 함량 조절을 통해 폴리실리콘막의 선택비를 조절하여 연마시키는 것이고, 헤테로고리화합물 및 글루타르산의 함량 조절을 통해 실리콘질화막의 선택비를 조절하여 연마시키는 것을 특징으로 하는 CMP용 슬러리 조성물을 이용한 연마방법.
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