JP2021098797A - Immersion liquid composition for semiconductor substrates - Google Patents
Immersion liquid composition for semiconductor substrates Download PDFInfo
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- JP2021098797A JP2021098797A JP2019230895A JP2019230895A JP2021098797A JP 2021098797 A JP2021098797 A JP 2021098797A JP 2019230895 A JP2019230895 A JP 2019230895A JP 2019230895 A JP2019230895 A JP 2019230895A JP 2021098797 A JP2021098797 A JP 2021098797A
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- Prior art keywords
- liquid composition
- immersion liquid
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- component
- mass
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims abstract description 126
- 239000007788 liquid Substances 0.000 title claims abstract description 100
- 238000007654 immersion Methods 0.000 title claims abstract description 99
- 239000004065 semiconductor Substances 0.000 title claims abstract description 52
- 239000000758 substrate Substances 0.000 title claims abstract description 47
- 239000000178 monomer Substances 0.000 claims abstract description 39
- 229920000642 polymer Polymers 0.000 claims abstract description 35
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- 150000008064 anhydrides Chemical class 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 28
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 20
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 229910021529 ammonia Inorganic materials 0.000 claims description 14
- 125000004432 carbon atom Chemical group C* 0.000 claims description 14
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 13
- 239000000470 constituent Substances 0.000 claims description 13
- 229910052708 sodium Inorganic materials 0.000 claims description 13
- 239000011734 sodium Substances 0.000 claims description 13
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 12
- 239000003599 detergent Substances 0.000 claims description 12
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 10
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- 229920005591 polysilicon Polymers 0.000 claims description 10
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 9
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 8
- 229910052783 alkali metal Inorganic materials 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 8
- 125000005529 alkyleneoxy group Chemical group 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 150000001340 alkali metals Chemical class 0.000 claims description 6
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 5
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 4
- 125000004429 atom Chemical group 0.000 claims description 4
- 150000007524 organic acids Chemical class 0.000 claims description 3
- 235000012431 wafers Nutrition 0.000 description 104
- 238000005498 polishing Methods 0.000 description 42
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 31
- 229910052710 silicon Inorganic materials 0.000 description 31
- 239000010703 silicon Substances 0.000 description 31
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 24
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 20
- 230000007547 defect Effects 0.000 description 17
- 238000011156 evaluation Methods 0.000 description 17
- -1 alkali metal salts Chemical class 0.000 description 15
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 15
- 239000002245 particle Substances 0.000 description 14
- 239000000126 substance Substances 0.000 description 14
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 13
- 239000007864 aqueous solution Substances 0.000 description 12
- ATVJXMYDOSMEPO-UHFFFAOYSA-N 3-prop-2-enoxyprop-1-ene Chemical compound C=CCOCC=C ATVJXMYDOSMEPO-UHFFFAOYSA-N 0.000 description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 10
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 10
- 238000007598 dipping method Methods 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
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- 239000002202 Polyethylene glycol Substances 0.000 description 8
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 8
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 8
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- 229920001223 polyethylene glycol Polymers 0.000 description 8
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 8
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 7
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 239000012459 cleaning agent Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 229910021642 ultra pure water Inorganic materials 0.000 description 6
- 239000012498 ultrapure water Substances 0.000 description 6
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 5
- 235000010724 Wisteria floribunda Nutrition 0.000 description 5
- 235000015165 citric acid Nutrition 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000006116 polymerization reaction Methods 0.000 description 5
- BAERPNBPLZWCES-UHFFFAOYSA-N (2-hydroxy-1-phosphonoethyl)phosphonic acid Chemical compound OCC(P(O)(O)=O)P(O)(O)=O BAERPNBPLZWCES-UHFFFAOYSA-N 0.000 description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 4
- 239000003729 cation exchange resin Substances 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 230000003472 neutralizing effect Effects 0.000 description 4
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 4
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 4
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 description 3
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 3
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 3
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- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
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- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 2
- FKTLISWEAOSVBS-UHFFFAOYSA-N 2-prop-1-en-2-yloxyprop-1-ene Chemical compound CC(=C)OC(C)=C FKTLISWEAOSVBS-UHFFFAOYSA-N 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
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- 239000003755 preservative agent Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- XJKVPKYVPCWHFO-UHFFFAOYSA-N silicon;hydrate Chemical compound O.[Si] XJKVPKYVPCWHFO-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Landscapes
- Detergent Compositions (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
Abstract
Description
本開示は、半導体基板用浸漬液組成物に関する。 The present disclosure relates to an immersion liquid composition for a semiconductor substrate.
近年、半導体メモリの高記録容量化に対する要求の高まりから半導体装置のデザインルールは微細化が進んでいる。このため半導体装置の製造過程で行われるフォトリソグラフィーにおいて焦点深度は浅くなり、シリコンウェーハ(ベアウェーハ)の表面欠陥(LPD:Light point defects)や表面粗さ(ヘイズ)の低減に対する要求はますます厳しくなっている。 In recent years, the design rules for semiconductor devices have been miniaturized due to the increasing demand for higher recording capacities of semiconductor memories. For this reason, the depth of focus becomes shallower in photolithography performed in the manufacturing process of semiconductor devices, and the demand for reducing surface defects (LPD: Light point defects) and surface roughness (haze) of silicon wafers (bare wafers) is becoming more and more stringent. It has become.
シリコンウェーハの品質を向上する目的で、シリコンウェーハの研磨は多段階で行われている。研磨後のシリコンウェーハ表面に研磨くずや砥粒等由来のパーティクルが残留していると、表面欠陥発生の原因となる。通常、研磨後のシリコンウェーハは、ウェーハ表面に残留するパーティクルを除去するため洗浄工程へと運ばれるが、洗浄工程に運ばれるまでの間、クエン酸を含む水溶液中で保管されている。これは、シリコンウェーハを大気中で保管すると、パーティクルがウェーハ表面に固着してしまい、洗浄工程での除去が難しくなるからである。 For the purpose of improving the quality of silicon wafers, polishing of silicon wafers is performed in multiple stages. If particles derived from polishing chips, abrasive grains, etc. remain on the surface of the silicon wafer after polishing, it causes surface defects. Normally, the polished silicon wafer is transported to a cleaning step in order to remove particles remaining on the wafer surface, but is stored in an aqueous solution containing citric acid until it is transported to the cleaning step. This is because when a silicon wafer is stored in the atmosphere, particles adhere to the surface of the wafer, making it difficult to remove them in the cleaning process.
研磨後のウェーハ表面に残留するパーティクルを除去する方法としては、例えば、特許文献1には、シリコンウェーハ等の半導体基板上に半導体素子を形成する際に使用される、有機あるいは無機の微細な異物及び油分の除去に有効な、発泡性の少ない洗浄剤組成物として、アクリル酸、メタクリル酸及びマレイン酸から選ばれる少なくとも1種をモノマー成分とし、該モノマー成分を全モノマー成分の使用量の20モル%以上用いて得られる、重量平均分子量が500〜15万のポリカルボン酸化合物を含有してなる、半導体基板用又は半導体素子用洗浄剤組成物が開示されている。 As a method for removing particles remaining on the surface of a wafer after polishing, for example, Patent Document 1 describes fine organic or inorganic foreign substances used when forming a semiconductor element on a semiconductor substrate such as a silicon wafer. And, as a cleaning agent composition having low foaming property which is effective for removing oil, at least one selected from acrylic acid, methacrylic acid and maleic acid is used as a monomer component, and the monomer component is 20 mol of the total amount of the monomer component used. A cleaning agent composition for a semiconductor substrate or a semiconductor device, which is obtained by using% or more and contains a polycarboxylic acid compound having a weight average molecular weight of 500 to 150,000, is disclosed.
近年、半導体デバイスの性能向上に伴い、半導体の配線幅がより微細化してきている。それに伴い、半導体ウェーハ(半導体基板)表面に残留するパーティクル数の更なる低減が要求されており、ウェーハ表面に残留するパーティクルをより効果的に除去する方法や組成物が求められている。 In recent years, as the performance of semiconductor devices has improved, the wiring width of semiconductors has become finer. Along with this, further reduction in the number of particles remaining on the surface of the semiconductor wafer (semiconductor substrate) is required, and a method and composition for more effectively removing the particles remaining on the surface of the wafer are required.
そこで、本開示は、一態様において、半導体基板に対する濡れ性を向上でき、ウェーハ表面上の残留物を低減できる浸漬液組成物、及び該浸漬液組成物を用いた半導体基板の製造方法を提供する。 Therefore, the present disclosure provides, in one aspect, an immersion liquid composition capable of improving wettability with respect to a semiconductor substrate and reducing residues on the wafer surface, and a method for producing a semiconductor substrate using the immersion liquid composition. ..
本開示は、一態様において、下記ポリマーA(成分A)を含む、半導体基板用浸漬液組成物に関する。
ポリマーA:下記式(I)で表されるモノマーa1又はその無水物由来の構成単位a1と、下記式(II)で表されるモノマーa2由来の構成単位a2とを含むポリマー又はその塩。
Polymer A: A polymer or a salt thereof containing a structural unit a1 derived from the monomer a1 represented by the following formula (I) or an anhydride thereof and a structural unit a2 derived from the monomer a2 represented by the following formula (II).
本開示は、その他の態様において、下記工程(1)及び(2)を含む、半導体基板の製造方法に関する。
(1)研磨された半導体基板を、本開示の浸漬液組成物に浸漬させる工程。
(2)工程(1)で得られた半導体基板を、洗浄剤組成物を用いて洗浄する工程。
The present disclosure relates to a method for manufacturing a semiconductor substrate, which comprises the following steps (1) and (2) in another aspect.
(1) A step of immersing a polished semiconductor substrate in the immersion liquid composition of the present disclosure.
(2) A step of cleaning the semiconductor substrate obtained in step (1) with a detergent composition.
本開示によれば、一態様において、半導体基板に対する濡れ性を向上でき、ウェーハ表面上の残留物を低減できる浸漬液組成物を提供できる。 According to the present disclosure, in one aspect, it is possible to provide an immersion liquid composition capable of improving wettability with respect to a semiconductor substrate and reducing residues on the wafer surface.
本開示は、一態様において、研磨された半導体基板を、特定のポリマーを含む浸漬液組成物に浸漬させることで、濡れ性を向上でき、表面欠陥の発生原因となるウェーハ表面上の残留物を低減できるという知見に基づく。 In one aspect of the present disclosure, by immersing a polished semiconductor substrate in an immersion liquid composition containing a specific polymer, wettability can be improved and residues on the wafer surface that cause surface defects can be removed. Based on the finding that it can be reduced.
すなわち、本開示は、一態様において、上記ポリマーA(成分A)を含む、半導体基板用浸漬液組成物(以下、「本開示の浸漬液組成物」ともいう)に関する。 That is, the present disclosure relates to an immersion liquid composition for a semiconductor substrate (hereinafter, also referred to as "immersion liquid composition of the present disclosure") containing the polymer A (component A) in one embodiment.
本開示の効果発現のメカニズムの詳細は明らかではないが、以下のように推察される。
一般的に、半導体基板の製造において、研磨機と洗浄機は一体型ではないため、研磨機から洗浄機まで搬送する必要がある。洗浄機でウェーハ表面に付着したパーティクルを効率よく除去するためには、洗浄する前に、ウェーハ表面に付着している残留物の量を減らすことや、残留物がウェーハ表面から剥がれやすくしておくことが考えられる。
本開示では、ポリマーA中のアルキレンオキシ基[式(II)の−(CH2)rO(AO)m−X]とカルボン酸ユニット[式(I)中のCOOM1]の双方がウェーハに吸着することにより、半導体基板に対する濡れ性を向上でき、ウェーハ表面に付着しているパーティクルが剥がれやすくなると考えられる。浸漬液組成物中でカルボン酸ユニットが解離している場合、解離したカルボン酸ユニットによる電荷反発により、パーティクルのウェーハ表面への再付着を抑制できると考えられる。このようにして、表面欠陥の原因となるパーティクルがウェーハ表面から除去されると考えられる。
ただし、本開示はこれらのメカニズムに限定して解釈されなくてもよい。
The details of the mechanism of effect manifestation of the present disclosure are not clear, but it is inferred as follows.
Generally, in the manufacture of semiconductor substrates, the polishing machine and the cleaning machine are not integrated, so it is necessary to transport the polishing machine from the cleaning machine to the cleaning machine. In order to efficiently remove particles adhering to the wafer surface with a washing machine, the amount of residue adhering to the wafer surface should be reduced and the residue should be easily peeled off from the wafer surface before cleaning. Can be considered.
In the present disclosure, both the alkyleneoxy group [-(CH 2 ) r O (AO) m- X of the formula (II)] and the carboxylic acid unit [COM 1 in the formula (I)] in the polymer A are attached to the wafer. It is considered that the adsorption can improve the wettability to the semiconductor substrate, and the particles adhering to the wafer surface can be easily peeled off. When the carboxylic acid unit is dissociated in the immersion liquid composition, it is considered that the re-adhesion of the particles to the wafer surface can be suppressed by the charge repulsion by the dissociated carboxylic acid unit. In this way, it is considered that particles that cause surface defects are removed from the wafer surface.
However, the present disclosure may not be construed as limiting to these mechanisms.
本開示において、「半導体基板用浸漬液組成物」は、半導体基板の製造工程で用いられる基板を浸漬して保管するための浸漬液組成物、研磨液組成物を用いて研磨された基板を洗浄工程の前に浸漬して保管するための浸漬液組成物、又は、研磨液組成物を用いて研磨された基板を無機物洗浄を行う前に浸漬して保管するための浸漬液組成物を含みうる。本開示において、「半導体基板」は、一又は複数の実施形態において、単結晶シリコンウェーハ又はポリシリコンウェーハである。 In the present disclosure, the "immersion liquid composition for a semiconductor substrate" refers to an immersion liquid composition for immersing and storing a substrate used in a process of manufacturing a semiconductor substrate, and a polishing liquid composition for cleaning a polished substrate. It may include a dipping solution composition for dipping and storing before the step, or a dipping solution composition for dipping and storing a substrate polished with the polishing solution composition before performing inorganic cleaning. .. In the present disclosure, the "semiconductor substrate" is, in one or more embodiments, a single crystal silicon wafer or a polysilicon wafer.
[ポリマーA(成分A)]
本開示の浸漬液組成物は、一又は複数の実施形態において、下記ポリマーA(以下、単に「成分A」ともいう)を含む。成分Aは、1種又は2種以上の組合せでもよい。
[Polymer A (Component A)]
The immersion liquid composition of the present disclosure contains the following polymer A (hereinafter, also simply referred to as “component A”) in one or more embodiments. The component A may be one kind or a combination of two or more kinds.
ポリマーAは、下記式(I)で表されるモノマーa1又はその無水物由来の構成単位a1(以下、単に「構成単位a1」ともいう)と、下記式(II)で表されるモノマーa2由来の構成単位a2(以下、単に「構成単位a2」ともいう)とを含むポリマー又はその塩である。構成単位a1は、1種でもよいし、2種以上の組合せでもよい。構成単位a2は、1種でもよいし、2種以上の組合せでもよい。 The polymer A is derived from the monomer a1 represented by the following formula (I) or the structural unit a1 derived from its anhydride (hereinafter, also simply referred to as “constituent unit a1”) and the monomer a2 represented by the following formula (II). It is a polymer containing the structural unit a2 (hereinafter, also simply referred to as “constituent unit a2”) or a salt thereof. The structural unit a1 may be one type or a combination of two or more types. The structural unit a2 may be one type or a combination of two or more types.
(モノマーa1)
モノマーa1は、下記式(I)で表されるモノマーである。
(Monomer a1)
Monomer a1 is a monomer represented by the following formula (I).
式(I)中、R1、R2及びR3はそれぞれ独立に、水素原子、メチル基、又は−(CH2)pCOOM2を示し、M1及びM2はそれぞれ独立に、水素原子、アルカリ金属、アルカリ土類金属(1/2原子)、又はアンモニウム基を示し、pは0以上2以下の整数を示す。 In formula (I), R 1 , R 2 and R 3 independently represent a hydrogen atom, a methyl group, or − (CH 2 ) p COM 2 , and M 1 and M 2 independently represent a hydrogen atom, respectively. It represents an alkali metal, an alkaline earth metal (1/2 atom), or an ammonium group, and p represents an integer of 0 or more and 2 or less.
式(I)において、R1、R2及びR3はそれぞれ独立に、水素原子、メチル基及び−(CH2)pCOOM2から選ばれる少なくとも1種であって、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、R1及びR3は水素原子、R2は水素原子またはメチル基が好ましく、R1及びR3は水素原子、R2はメチル基がより好ましい。
式(I)において、M1及びM2はそれぞれ独立に、水素原子、アルカリ金属、アル
カリ土類金属(1/2原子)、又はアンモニウム基を示し、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、アルカリ金属が好ましく、ナトリウム及びカリウムがより好ましい。アンモニウム基としては、「NH4 +」で表される基(アンモニウム基)、有機アンモニウム基が挙げられる。
式(I)において、pは0以上2以下の整数であって、濡れ性向上の観点、及び、ウ
ェーハ表面上の残留物低減の観点から、0又は1が好ましく、0がより好ましい。
In formula (I), R 1, R 2 and R 3 are each independently a hydrogen atom, a methyl group and - a (CH 2) at least one selected from p COOM 2, in view of improving wettability, and From the viewpoint of reducing residues on the wafer surface, R 1 and R 3 are preferably hydrogen atoms, R 2 is preferably hydrogen atoms or methyl groups, R 1 and R 3 are more preferably hydrogen atoms, and R 2 is more preferably methyl groups.
In the formula (I), M 1 and M 2 independently represent a hydrogen atom, an alkali metal, an alkaline earth metal (1/2 atom), or an ammonium group from the viewpoint of improving wettability and on the wafer surface. From the viewpoint of reducing the residue of alkali metal, alkali metal is preferable, and sodium and potassium are more preferable. The ammonium group, "NH 4 +" group represented by (ammonium group), and an organic ammonium group.
In the formula (I), p is an integer of 0 or more and 2 or less, and is preferably 0 or 1, more preferably 0, from the viewpoint of improving wettability and reducing residues on the wafer surface.
式(I)で表されるモノマーa1は無水物であってもよい。 The monomer a1 represented by the formula (I) may be anhydrous.
モノマーa1としては、例えば、アクリル酸、メタクリル酸、マレイン酸、フマル酸、イタコン酸等及びそれらの無水物並びにそれらの塩が挙げられ、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、アクリル酸、メタクリル酸、マレイン酸及び無水マレイン酸から選ばれる少なくとも1種が好ましく、アクリル酸及びメタクリル酸の少なくとも一方がより好ましく、アクリル酸がさらに好ましい。塩としては、アルカリ金属塩、アルカリ土類金属塩、アンモニウム塩、有機アンモニウム塩等が挙げられ、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、アルカリ金属塩が好ましく、ナトリウム塩及びカリウム塩がより好ましい。 Examples of the monomer a1 include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid and the like, their anhydrides and salts thereof, from the viewpoint of improving wettability and reducing residues on the wafer surface. From the above viewpoint, at least one selected from acrylic acid, methacrylic acid, maleic acid and maleic anhydride is preferable, at least one of acrylic acid and methacrylic acid is more preferable, and acrylic acid is further preferable. Examples of the salt include alkali metal salts, alkaline earth metal salts, ammonium salts, organic ammonium salts and the like, and alkali metal salts are preferable from the viewpoint of improving wettability and reducing residues on the wafer surface. Sodium and potassium salts are more preferred.
(モノマーa2)
モノマーa2は、下記式(II)で表されるモノマーである。
(Monomer a2)
Monomer a2 is a monomer represented by the following formula (II).
式(II)中、R4及びR5はそれぞれ独立に、水素原子又はメチル基を示し、rは0以上2以下の整数を示し、AOは炭素数2以上18以下のアルキレンオキシ基を示し、mはAOの平均付加モル数であって、1以上300以下の数を示し、Xは水素原子又は炭素数1以上18以下のアルキル基を示す。 In formula (II), R 4 and R 5 independently represent a hydrogen atom or a methyl group, r represents an integer of 0 or more and 2 or less, and AO represents an alkyleneoxy group having 2 or more and 18 or less carbon atoms. m is the average number of added moles of AO, and indicates a number of 1 or more and 300 or less, and X indicates a hydrogen atom or an alkyl group having 1 or more and 18 or less carbon atoms.
式(II)において、AOは、炭素数2以上18以下のアルキレンオキシ基を示し、該アルキレンオキシ基は直鎖状及び分岐状のいずれの形態であってもよい。AOは1種であっても2種以上であってもよい。AOが2種以上のとき、その付加形式はランダム状であってもブロック状であってもよい。アルキレンオキシ基の炭素数としては、炭素数2以上18以下であって、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、炭素数2以上12以下が好ましく、炭素数2又は3がより好ましい。AOとしては、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、オキシエチレン(EO)基及びオキシプロピレン(PO)基から選ばれる少なくとも一方が好ましく、オキシエチレン(EO)基がより好ましい。
式(II)において、mは、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、1以上であって、5以上が好ましく、10以上がより好ましく、15以上が更に好ましく、そして、300以下であって、150以下が好ましく、100以下がより好ましく、40以下が更に好ましい。より具体的には、mは、1以上300以下の数であって、5以上150以下が好ましく、10以上100以下がより好ましく、15以上40以下が更に好ましい。
式(II)において、Xは、水素原子又は炭素数1以上18以下のアルキル基を示し、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、水素原子又は炭素数1以上12以下のアルキル基が好ましく、水素原子又は炭素数1以上3以下のアルキル基がより好ましく、水素原子が更に好ましい。該アルキル基は、直鎖状及び分岐状のいずれの形態であってもよい。炭素数1以上18以下のアルキル基としては、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、例えば、メチル基、エチル基、n−プロピル基、イソプロピル基等が挙げられる。
In the formula (II), AO represents an alkyleneoxy group having 2 to 18 carbon atoms, and the alkyleneoxy group may be in either a linear form or a branched form. AO may be one kind or two or more kinds. When there are two or more types of AO, the addition form may be random or block. The number of carbon atoms of the alkyleneoxy group is preferably 2 or more and 18 or less, and preferably 2 or more and 12 or less carbon atoms from the viewpoint of improving wettability and reducing residues on the wafer surface. Or 3 is more preferable. As the AO, at least one selected from an oxyethylene (EO) group and an oxypropylene (PO) group is preferable from the viewpoint of improving wettability and reducing residues on the wafer surface, and an oxyethylene (EO) group is preferable. Is more preferable.
In the formula (II), m is 1 or more, preferably 5 or more, more preferably 10 or more, still more preferably 15 or more, from the viewpoint of improving wettability and reducing residues on the wafer surface. And, it is 300 or less, preferably 150 or less, more preferably 100 or less, and even more preferably 40 or less. More specifically, m is a number of 1 or more and 300 or less, preferably 5 or more and 150 or less, more preferably 10 or more and 100 or less, and further preferably 15 or more and 40 or less.
In the formula (II), X represents a hydrogen atom or an alkyl group having 1 or more carbon atoms and 18 or less carbon atoms, and has a hydrogen atom or 1 or more carbon atoms from the viewpoint of improving wettability and reducing residues on the wafer surface. An alkyl group of 12 or less is preferable, an alkyl group having 1 or more and 3 or less carbon atoms is more preferable, and a hydrogen atom is further preferable. The alkyl group may be in either linear or branched form. Examples of the alkyl group having 1 to 18 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group and the like from the viewpoint of improving wettability and reducing residues on the wafer surface. ..
モノマーa2としては、式(II)中のrが0の場合、例えば、ポリエチレングリコールビニルエーテル、メトキシポリエチレングリコールビニルエーテル、エトキシポリエチレングリコールビニルエーテル、プロポキシポリエチレングリコールビニルエーテル、ポリプロピレングリコールビニルエーテル、メトキシポリプロピレングリコールビニルエーテル、エトキシポリプロピレングリコールビニルエーテル、プロポキシポリプロピレングリコールビニルエーテル、ポリエチレングリコールイソプロペニルエーテル、ポリプロピレングリコールイソプロペニルエーテル等が挙げられる。 As the monomer a2, when r in the formula (II) is 0, for example, polyethylene glycol vinyl ether, methoxypolyethylene glycol vinyl ether, ethoxypolyethylene glycol vinyl ether, propoxypolyethylene glycol vinyl ether, polypropylene glycol vinyl ether, methoxypolypropylene glycol vinyl ether, ethoxypolypropylene glycol. Examples thereof include vinyl ether, propoxypolypropylene glycol vinyl ether, polyethylene glycol isopropenyl ether, polypropylene glycol isopropenyl ether and the like.
モノマーa2としては、式(II)中のrが1の場合、例えば、ポリエチレングリコールアリルエーテル、メトキシポリエチレングリコールアリルエーテル、エトキシポリエチレングリコールアリルエーテル、プロポキシポリエチレングリコールアリルエーテル、ポリプロピレングリコールアリルエーテル、メトキシポリプロピレングリコールアリルエーテル、エトキシポリプロピレングリコールアリルエーテル、プロポキシポリプロピレングリコールアリルエーテル、ポリエチレングリコール−2−メチルアリルエーテル、ポリプロピレングリコール−2−メチルアリルエーテル、ポリエチレングリコール−2−ブテニルエーテル、ポリプロピレングリコール−2−ブテニルエーテル等が挙げられる。 As the monomer a2, when r in the formula (II) is 1, for example, polyethylene glycol allyl ether, methoxypolyethylene glycol allyl ether, ethoxypolyethylene glycol allyl ether, propoxypolyethylene glycol allyl ether, polypropylene glycol allyl ether, methoxypolypropylene glycol. Allyl ether, ethoxypolypropylene glycol allyl ether, propoxypolypropylene glycol allyl ether, polyethylene glycol-2-methylallyl ether, polypropylene glycol-2-methylallyl ether, polyethylene glycol-2-butenyl ether, polypropylene glycol-2-butenyl ether And so on.
モノマーa2としては、式(II)中のrが2の場合、例えば、ポリエチレングリコール−3−ブテニルエーテル、メトキシポリエチレングリコール−3−ブテニルエーテル、エトキシポリエチレングリコール−3−ブテニルエーテル、プロポキシポリエチレングリコール−3−ブテニルエーテル、ポリプロピレングリコール−3−ブテニルエーテル、メトキシポリプロピレングリコール−3−ブテニルエーテル、エトキシポリプロピレングリコール−3−ブテニルエーテル、プロポキシポリプロピレングリコール−3−ブテニルエーテル、ポリエチレングリコール−3−メチル−3−ブテニルエーテル、メトキシポリエチレングリコール−3−メチル−3−ブテニルエーテル、エトキシポリエチレングリコール−3−メチル−3−ブテニルエーテル、プロポキシポリエチレングリコール−3−メチル−3−ブテニルエーテル、ポリプロピレングリコール−3−メチル−3−ブテニルエーテル、メトキシポリプロピレングリコール−3−メチル−3−ブテニルエーテル、エトキシポリプロピレングリコール−3−メチル−3−ブテニルエーテル、プロポキシポリプロピレングリコール−3−メチル−3−ブテニルエーテル等が挙げられる。 As the monomer a2, when r in the formula (II) is 2, for example, polyethylene glycol-3-butenyl ether, methoxypolyethylene glycol-3-butenyl ether, ethoxypolyethylene glycol-3-butenyl ether, propoxypolyethylene. Glycol-3-butenyl ether, polypropylene glycol-3-butenyl ether, methoxypolypropylene glycol-3-butenyl ether, ethoxypolypropylene glycol-3-butenyl ether, propoxypolypropylene glycol-3-butenyl ether, polyethylene glycol- 3-Methyl-3-butenyl ether, methoxypolyethylene glycol-3-methyl-3-butenyl ether, ethoxypolyethylene glycol-3-methyl-3-butenyl ether, propoxypolyethylene glycol-3-methyl-3-butenyl Ether, Polyethylene Glycol-3-Methyl-3-Butenyl Ether, methoxyPolyethylene Glycol-3-Methyl-3-Butenyl Ether, ethoxyPolyethylene Glycol-3-Methyl-3-Butenyl Ether, Propoxy Polyethylene Glycol-3-Methyl -3-Butenyl ether and the like can be mentioned.
成分Aの全構成単位中における構成単位a1と構成単位a2とのモル比(a1/a2)は、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、50/50以上が好ましく、60/40以上がより好ましく、65/35以上が更に好ましく、そして、同様の観点から、99/1以下が好ましく、95/5以下がより好ましく、90/10以下が更に好ましい。より具体的には、モル比(a1/a2)は、50/50以上99/1以下が好ましく、60/40以上95/5以下がより好ましく、65/35以上90/10以下が更に好ましい。 The molar ratio (a1 / a2) of the constituent unit a1 and the constituent unit a2 in all the constituent units of the component A is 50/50 or more from the viewpoint of improving the wettability and reducing the residue on the wafer surface. Preferably, 60/40 or more is more preferable, 65/35 or more is further preferable, and from the same viewpoint, 99/1 or less is preferable, 95/5 or less is more preferable, and 90/10 or less is further preferable. More specifically, the molar ratio (a1 / a2) is preferably 50/50 or more and 99/1 or less, more preferably 60/40 or more and 95/5 or less, and further preferably 65/35 or more and 90/10 or less.
成分Aは、構成単位a1及び構成単位a2以外の他の構成単位をさらに含有することができる。他の構成単位としては、例えば、(メタ)アクリル酸アルキルエステル、ヒドロキシエチル(メタ)アクリレート、アクリルアミド類、酢酸ビニル、スチレン、オレフィン、ビニルアルコール、アリルアルコール、アリルアルコールのポリアルキレンオキサイド付加物等から選ばれる少なくとも1種の化合物由来の構成単位が挙げられる。本開示において、成分Aの全構成単位中における構成単位a1及び構成単位a2の合計含有量は、本開示の効果を発現させる観点から、85モル%以上が好ましく、90モル%以上がより好ましく、97モル%以上が更に好ましく、99モル%以上が更に好ましく、100モル%が更に好ましい。 The component A can further contain other structural units other than the structural unit a1 and the structural unit a2. Other constituent units include, for example, (meth) acrylic acid alkyl esters, hydroxyethyl (meth) acrylates, acrylamides, vinyl acetate, styrene, olefins, vinyl alcohols, allyl alcohols, polyalkylene oxide adducts of allyl alcohols, and the like. Constituent units derived from at least one compound selected may be mentioned. In the present disclosure, the total content of the constituent unit a1 and the constituent unit a2 in all the constituent units of the component A is preferably 85 mol% or more, more preferably 90 mol% or more, from the viewpoint of exhibiting the effects of the present disclosure. 97 mol% or more is further preferable, 99 mol% or more is further preferable, and 100 mol% is further preferable.
成分Aは、例えば、モノマーa1及びモノマーa2を含むモノマー混合物を溶液重合法で重合させる等、公知の方法で得ることができる。溶液重合に用いられる溶媒としては、水;トルエン、キシレン等の芳香族系炭化水素;エタノール、2−プロパノール等のアルコール;アセトン、メチルエチルケトン等のケトン;テトラヒドロフラン、ジエチレングリコールジメチルエーテル等のエーテル;等が挙げられる。重合に用いられる重合開始剤としては、公知のラジカル開始剤を用いることができ、例えば、ペルオキソ二硫酸アンモニウム(過硫酸アンモニウム塩)、過酸化水素水、ペルオキソ二硫酸ナトリウム等が挙げられる。重合の際、連鎖移動剤をさらに用いることができ、例えば、2−メルカプトエタノール、β−メルカプトプロピオン酸等のチオール系連鎖移動剤;1,2−プロパンジオール等の連鎖移動剤兼溶媒が挙げられる。本開示において、成分Aの全構成単位中の各構成単位の含有量は、重合に用いるモノマー全量に対する各モノマーの使用量の割合とみなすことができる。 The component A can be obtained by a known method, for example, by polymerizing a monomer mixture containing the monomer a1 and the monomer a2 by a solution polymerization method. Examples of the solvent used for solution polymerization include water; aromatic hydrocarbons such as toluene and xylene; alcohols such as ethanol and 2-propanol; ketones such as acetone and methyl ethyl ketone; and ethers such as tetrahydrofuran and diethylene glycol dimethyl ether; .. As the polymerization initiator used for the polymerization, a known radical initiator can be used, and examples thereof include ammonium peroxodisulfate (ammonium persulfate salt), hydrogen peroxide solution, and sodium peroxodisulfate. In the polymerization, a chain transfer agent can be further used, and examples thereof include thiol-based chain transfer agents such as 2-mercaptoethanol and β-mercaptopropionic acid; and chain transfer agents and solvents such as 1,2-propanediol. .. In the present disclosure, the content of each structural unit in all the structural units of component A can be regarded as the ratio of the amount of each monomer used to the total amount of monomers used for polymerization.
成分Aを構成する各構成単位の配列は、ランダム、ブロック、又はグラフトのいずれでもよい。 The sequence of each structural unit constituting the component A may be random, block, or graft.
成分Aが、モノマーa1由来の塩生成基(−COOH、−(CH2)pCOOH)を有している場合、中和剤により中和して用いることができる。中和剤としては、例えば、水酸化ナトリウム、水酸化カリウム、アンモニア等が挙げられる。なお、ここで用いた中和剤は後述するアルカリ剤(成分C)とは異なり、成分Cには含まれない。 When the component A has a salt-forming group (-COOH,-(CH 2 ) p COOH) derived from the monomer a1, it can be used after being neutralized with a neutralizing agent. Examples of the neutralizing agent include sodium hydroxide, potassium hydroxide, ammonia and the like. The neutralizing agent used here is not included in the component C, unlike the alkaline agent (component C) described later.
成分Aの重量平均分子量は、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、5,000以上であって、10,000以上が好ましく、20,000以上がより好ましく、25,000以上が更に好ましく、そして、同様の観点から、100,000以下であって、80,000以下が好ましく、70,000以下がより好ましく、60,000以下が更に好ましい。より具体的には、成分Aの重量平均分子量は、5,000以上100,000以下であって、10,000以上80,0000以下が好ましく、20,000以上70,000以下がより好ましく、25,000以上60,000以下が更に好ましい。本開示において重量平均分子量は、ゲルパーミエーションクロマトグラフィー法(ポリエチレングリコール換算)によるものであり、具体的には、実施例に記載の方法により測定できる。 The weight average molecular weight of the component A is 5,000 or more, preferably 10,000 or more, more preferably 20,000 or more, from the viewpoint of improving wettability and reducing residues on the wafer surface. 25,000 or more is more preferable, and from the same viewpoint, 100,000 or less, 80,000 or less is preferable, 70,000 or less is more preferable, and 60,000 or less is further preferable. More specifically, the weight average molecular weight of the component A is 5,000 or more and 100,000 or less, preferably 10,000 or more and 80,000 or less, more preferably 20,000 or more and 70,000 or less, 25. More preferably, it is 000 or more and 60,000 or less. In the present disclosure, the weight average molecular weight is based on a gel permeation chromatography method (polyethylene glycol equivalent), and can be specifically measured by the method described in Examples.
本開示の浸漬液組成物における成分Aの含有量は、濡れ性向上の観点、及び、ウェーハ表面上の残留物低減の観点から、0.001質量%以上が好ましく、0.005質量%以上がより好ましく、0.01質量%以上が更に好ましく、そして、同様の観点から、5質量%以下が好ましく、3質量%以下がより好ましく、2質量%以下が更に好ましく、1質量%以下が更に好ましく、0.5質量%以下が更に好ましく、0.2質量%以下が更に好ましい。より具体的には、成分Aの含有量は、0.001質量%以上10質量%以下が好ましく、0.005質量%以上5質量%以下がより好ましく、0.01質量%以上2質量%以下が更に好ましく、0.01質量%以上1質量%以下が更に好ましく、0.01質量%以上0.5質量%以下が更に好ましく、0.01質量%以上0.2質量%以下が更に好ましい。 The content of component A in the immersion liquid composition of the present disclosure is preferably 0.001% by mass or more, preferably 0.005% by mass or more, from the viewpoint of improving wettability and reducing residues on the wafer surface. More preferably, 0.01% by mass or more is further preferable, and from the same viewpoint, 5% by mass or less is preferable, 3% by mass or less is more preferable, 2% by mass or less is further preferable, and 1% by mass or less is further preferable. , 0.5% by mass or less, more preferably 0.2% by mass or less. More specifically, the content of the component A is preferably 0.001% by mass or more and 10% by mass or less, more preferably 0.005% by mass or more and 5% by mass or less, and 0.01% by mass or more and 2% by mass or less. Is further preferable, 0.01% by mass or more and 1% by mass or less is further preferable, 0.01% by mass or more and 0.5% by mass or less is further preferable, and 0.01% by mass or more and 0.2% by mass or less is further preferable.
[水(成分B)]
本開示の浸漬液組成物は、一又は複数の実施形態において、水(以下、「成分B」ともいう)を含む。成分Bとしては、例えば、超純水、純水、イオン交換水、蒸留水等が挙げられる。本開示の浸漬液組成物中における成分Bの含有量は、成分A及び必要に応じて配合される後述する任意成分を除いた残余とすることができる。具体的には、本開示の浸漬液組成物における成分Bの含有量は、ウェーハ表面上の残留物低減の観点から、90質量%以上が好ましく、95質量%以上がより好ましく、99質量%以上が更に好ましく、そして、同様の観点から、99.99質量%以下が好ましく、99.98質量%以下がより好ましく、99.97質量%以下がさらに好ましい。
[Water (Component B)]
The immersion liquid composition of the present disclosure contains water (hereinafter, also referred to as "component B") in one or more embodiments. Examples of the component B include ultrapure water, pure water, ion-exchanged water, distilled water and the like. The content of the component B in the immersion liquid composition of the present disclosure can be the residue excluding the component A and any component described later, which is blended as needed. Specifically, the content of component B in the immersion liquid composition of the present disclosure is preferably 90% by mass or more, more preferably 95% by mass or more, and 99% by mass or more, from the viewpoint of reducing residues on the wafer surface. Is more preferable, and from the same viewpoint, 99.99% by mass or less is preferable, 99.98% by mass or less is more preferable, and 99.97% by mass or less is further preferable.
[アルカリ剤(成分C)]
本開示の浸漬液組成物は、一又は複数の実施形態において、ウェーハ表面上の残留物低減の観点から、アルカリ剤(以下、「成分C」ともいう)をさらに含有してもよい。成分Cとしては、一又は複数の実施形態において、無機アルカリ剤及び有機アルカリ剤から選ばれる少なくとも1種が挙げられる。無機アルカリ剤としては、例えば、アンモニア;水酸化カリウム及び水酸化ナトリウム等のアルカリ金属水酸化物;等が挙げられる。有機アルカリ剤としては、例えば、ヒドロキシアルキルアミン、第四級アンモニウム塩等が挙げられる。ヒドロキシアルキルアミンとしては、例えば、モノエタノールアミン、ジエタノールアミン、トリエタノールアミン、メチルエタノールアミン、メチルジエタノールアミン、モノプロパノールアミン、ジプロパノールアミン、トリプロパノールアミン、メチルプロパノールアミン、メチルジプロパノールアミン、及びアミノエチルエタノールアミン等が挙げられる。第四級アンモニウム塩としては、例えば、テトラメチルアンモニウムハイドロオキサイド、及びコリン等が挙げられる。成分Cは、1種でもよいし、2種以上の組合せでもよい。
[Alkaline agent (component C)]
In one or more embodiments, the immersion liquid composition of the present disclosure may further contain an alkaline agent (hereinafter, also referred to as “component C”) from the viewpoint of reducing residues on the wafer surface. The component C includes at least one selected from an inorganic alkaline agent and an organic alkaline agent in one or more embodiments. Examples of the inorganic alkaline agent include ammonia; alkali metal hydroxides such as potassium hydroxide and sodium hydroxide; and the like. Examples of the organic alkaline agent include hydroxyalkylamines, quaternary ammonium salts and the like. Examples of hydroxyalkylamines include monoethanolamine, diethanolamine, triethanolamine, methylethanolamine, methyldiethanolamine, monopropanolamine, dipropanolamine, tripropanolamine, methylpropanolamine, methyldipropanolamine, and aminoethylethanol. Examples include amines. Examples of the quaternary ammonium salt include tetramethylammonium hydroxide and choline. The component C may be one kind or a combination of two or more kinds.
成分Cとしては、ウェーハ表面上の残留物低減の観点から、アルカリ金属水酸化物、アンモニア、ヒドロキシアルキルアミン及び第四級アンモニウム塩から選ばれる少なくとも1種が好ましく、アンモニア及びヒドロキシルアミンから選ばれる少なくとも1種がより好ましく、アンモニア及びモノエタノールアミンから選ばれる少なくとも1種が更に好ましい。 As the component C, at least one selected from alkali metal hydroxide, ammonia, hydroxyalkylamine and quaternary ammonium salt is preferable, and at least one selected from ammonia and hydroxylamine is preferable from the viewpoint of reducing residues on the wafer surface. One is more preferred, and at least one selected from ammonia and monoethanolamine is even more preferred.
本開示の浸漬液組成物における成分Cの含有量は、ウェーハ表面上の残留物低減とウェーハ濡れ性の両立の観点から、0.00001質量%以上が好ましく、0.0001質量%以上がより好ましく、0.001質量%以上が更に好ましく、そして、同様の観点から、2.0質量%以下が好ましく、0.3質量%以下がより好ましく、0.1質量%以下が更に好ましく、0.07質量%以下が更に好ましく、0.05質量%以下が更に好ましい。より具体的には、成分Cの含有量は、0.00001質量%以上2.0質量%以下が好ましく、0.00001質量%以上0.3質量%以下がより好ましく、0.00001質量%以上0.1質量%以下が更に好ましく、0.00001質量%以上0.07質量%以下が更に好ましく、0.00001質量%以上0.05質量%以下が更に好ましい。 The content of component C in the immersion liquid composition of the present disclosure is preferably 0.00001% by mass or more, more preferably 0.0001% by mass or more, from the viewpoint of achieving both reduction of residues on the wafer surface and wafer wettability. , 0.001% by mass or more, and from the same viewpoint, 2.0% by mass or less is more preferable, 0.3% by mass or less is more preferable, 0.1% by mass or less is further preferable, and 0.07. More preferably, it is mass% or less, and further preferably 0.05 mass% or less. More specifically, the content of the component C is preferably 0.00001% by mass or more and 2.0% by mass or less, more preferably 0.00001% by mass or more and 0.3% by mass or less, and 0.00001% by mass or more. 0.1% by mass or less is further preferable, 0.00001% by mass or more and 0.07% by mass or less is further preferable, and 0.00001% by mass or more and 0.05% by mass or less is further preferable.
[有機酸(成分D)]
本開示の浸漬液組成物は、一又は複数の実施形態において、ウェーハ表面上の残留物低減の観点から、有機酸(以下、「成分D」ともいう)をさらに含有することができる。
成分Dとしては、例えば、クエン酸、リンゴ酸、グルコン酸、マレイン酸、酢酸、イタコン酸、コハク酸、酒石酸、マロン酸、メタンスルホン酸、ギ酸、乳酸、ヒドロキシエチリデンジホスホン酸(HEDP)、アミノトリメチルホスホン酸、及びホスホノブタントリカルボン酸から選ばれる少なくとも1種が挙げられる。これらのなかでも、ウェーハ表面上の残留物低減の観点から、成分Dとしては、クエン酸、リンゴ酸、マレイン酸、酒石酸及びHEDPから選ばれる少なくとも1種が好ましく、リンゴ酸、マレイン酸、及びHEDPから選ばれる少なくとも1種がより好ましい。成分Dは、1種でもよいし、2種以上の組合せでもよい。
[Organic acid (component D)]
In one or more embodiments, the immersion liquid composition of the present disclosure may further contain an organic acid (hereinafter, also referred to as “component D”) from the viewpoint of reducing residues on the wafer surface.
Examples of component D include citric acid, malic acid, gluconic acid, maleic acid, acetic acid, itaconic acid, succinic acid, tartaric acid, malonic acid, methanesulfonic acid, formic acid, lactic acid, hydroxyethylidene diphosphonic acid (HEDP), and amino. At least one selected from trimethylphosphonic acid and phosphonobutane tricarboxylic acid can be mentioned. Among these, at least one selected from citric acid, maleic acid, maleic acid, tartaric acid and HEDP is preferable as the component D from the viewpoint of reducing residues on the wafer surface, and malic acid, maleic acid and HEDP are preferable. At least one selected from is more preferred. The component D may be one kind or a combination of two or more kinds.
本開示の浸漬液組成物における成分Dの含有量は、一又は複数の実施形態において、ウェーハ表面上の残留物低減の観点から、0.00001質量%以上が好ましく、0.00005質量%以上がより好ましく、0.0001質量%以上が更に好ましく、そして、0.1質量%以下が好ましく、0.05質量%以下がより好ましく、0.03質量%以下が更に好ましい。より具体的には、成分Dの含有量は、0.00001質量%以上0.1質量%以下が好ましく、0.00005質量%以上0.05質量%以下がより好ましく、0.0001質量%以上0.03質量%以下が更に好ましい。成分Dが2種以上の組合せの場合、成分Dの含有量はそれらの合計含有量をいう。 The content of component D in the immersion liquid composition of the present disclosure is preferably 0.00001% by mass or more, preferably 0.00005% by mass or more, from the viewpoint of reducing residues on the wafer surface in one or more embodiments. More preferably, 0.0001% by mass or more is further preferable, 0.1% by mass or less is preferable, 0.05% by mass or less is more preferable, and 0.03% by mass or less is further preferable. More specifically, the content of the component D is preferably 0.00001% by mass or more and 0.1% by mass or less, more preferably 0.00005% by mass or more and 0.05% by mass or less, and 0.0001% by mass or more. More preferably 0.03% by mass or less. When the component D is a combination of two or more kinds, the content of the component D means the total content thereof.
本開示の浸漬液組成物における成分Aと成分Dとの質量比(A/D)は、ウェーハ表面上の残留物低減の観点から、0.01以上が好ましく、0.03以上がより好ましく、0.05以上が更に好ましく、そして、同様の観点から、1,000,000以下が好ましく、1,000以下がより好ましく、10以下が更に好ましい。より具体的には、質量比(A/D)は、0.01以上1,000,000以下が好ましく、0.03以上1,000以下がより好ましく、0.05以上10以下が更に好ましい。 The mass ratio (A / D) of the component A to the component D in the immersion liquid composition of the present disclosure is preferably 0.01 or more, more preferably 0.03 or more, from the viewpoint of reducing residues on the wafer surface. 0.05 or more is more preferable, and from the same viewpoint, 1,000,000 or less is preferable, 1,000 or less is more preferable, and 10 or less is further preferable. More specifically, the mass ratio (A / D) is preferably 0.01 or more and 1,000,000 or less, more preferably 0.03 or more and 1,000 or less, and further preferably 0.05 or more and 10 or less.
本開示の浸漬液組成物は、本開示の効果が妨げられない範囲で、その他の成分を含有することができる。その他の成分としては、例えば、pH調整剤、キレート剤、防腐剤、アルコール類等が挙げられる。 The immersion liquid composition of the present disclosure may contain other components as long as the effects of the present disclosure are not impaired. Examples of other components include pH adjusters, chelating agents, preservatives, alcohols and the like.
本開示の浸漬液組成物は、一又は複数の実施形態において、ナトリウムを実質的に含まない。すなわち、本開示の浸漬液組成物中のナトリウムの含有量は1ppm以下である。例えば、ナトリウムを含む浸漬液組成物を陽イオン交換樹脂に接触させて金属除去処理を行い、浸漬液組成物中のナトリウム含有量を1ppm以下に調整することができる。 The immersion liquid composition of the present disclosure is substantially free of sodium in one or more embodiments. That is, the content of sodium in the immersion liquid composition of the present disclosure is 1 ppm or less. For example, the sodium content in the immersion liquid composition can be adjusted to 1 ppm or less by contacting the immersion liquid composition containing sodium with a cation exchange resin to perform a metal removal treatment.
本開示の浸漬液組成物は、成分A、成分B、及び、所望により上述した任意成分(成分C、成分D、その他の成分)を公知の方法で配合することにより製造できる。すなわち、本開示は、その他の態様において、少なくとも成分A及び水を配合する工程を含む、浸漬液組成物の製造方法に関する。成分Aが複数種類のポリマーの組合せである場合、成分Aは、複数種類のポリマーをそれぞれ配合することにより得ることができる。ここで、「配合する」とは、成分A及び水、並びに必要に応じて上述した任意成分を同時に又は順に混合することを含む。混合する順序は特に限定されない。前記配合は、例えば、ホモミキサー、ホモジナイザー、超音波分散機及び湿式ボールミル等の混合器を用いて行うことができる。本開示において、浸漬液組成物の製造方法における各成分の配合量は、上述した本開示の浸漬液組成物中の各成分の含有量と同じとすることができる。 The immersion liquid composition of the present disclosure can be produced by blending component A, component B, and optionally the above-mentioned optional components (component C, component D, and other components) by a known method. That is, the present disclosure relates to a method for producing an immersion liquid composition, which comprises, in other embodiments, at least a step of blending component A and water. When the component A is a combination of a plurality of types of polymers, the component A can be obtained by blending the plurality of types of polymers, respectively. Here, "blending" includes mixing the component A and water, and if necessary, the above-mentioned optional components at the same time or in order. The order of mixing is not particularly limited. The compounding can be carried out using, for example, a mixer such as a homomixer, a homogenizer, an ultrasonic disperser, and a wet ball mill. In the present disclosure, the blending amount of each component in the method for producing the immersion liquid composition can be the same as the content of each component in the immersion liquid composition of the present disclosure described above.
本開示において、「浸漬液組成物における各成分の含有量」は、浸漬液組成物の使用時、例えば、浸漬液組成物を半導体基板の浸漬に使用する時点における前記各成分の含有量をいう。 In the present disclosure, the "content of each component in the immersion liquid composition" refers to the content of each component at the time of using the immersion liquid composition, for example, when the immersion liquid composition is used for immersion of a semiconductor substrate. ..
本開示において、浸漬液組成物は、一又は複数の実施形態において、濃縮物として製造され、使用時に、必要に応じて希釈して使用してもよい。浸漬液組成物の濃縮物は、使用時に各成分の含有量が上述した含有量となるように水で希釈して使用することができる。本開示において浸漬液組成物の濃縮物の「使用時」とは、一又は複数の実施形態において、浸漬液組成物の濃縮物が希釈された状態をいう。 In the present disclosure, the immersion liquid composition may be produced as a concentrate in one or more embodiments, and may be diluted and used as necessary at the time of use. The concentrate of the immersion liquid composition can be diluted with water so that the content of each component becomes the above-mentioned content at the time of use. In the present disclosure, "when in use" of the concentrate of the immersion liquid composition means a state in which the concentrate of the immersion liquid composition is diluted in one or more embodiments.
本開示の浸漬液組成物のpHは、ウェーハ表面上の残留物低減の観点から、1以上が好ましく、2以上がより好ましく、そして、同様の観点から、11以下が好ましく、10以下がより好ましく、9以下が更に好ましく、5以下が更に好ましい。より具体的には、本開示の浸漬液組成物のpHは、1以上11以下が好ましく、1以上10以下がより好ましく、1以上9以下が更に好ましく、2以上9以下が更に好ましく、2以上5以下が更に好ましい。本開示において、浸漬液組成物のpHは、25℃における値であって、pHメータを用いて測定でき、具体的には、実施例に記載の方法で測定できる。 The pH of the immersion liquid composition of the present disclosure is preferably 1 or more, more preferably 2 or more, and from the same viewpoint, preferably 11 or less, more preferably 10 or less, from the viewpoint of reducing residues on the wafer surface. , 9 or less is more preferable, and 5 or less is further preferable. More specifically, the pH of the immersion liquid composition of the present disclosure is preferably 1 or more and 11 or less, more preferably 1 or more and 10 or less, further preferably 1 or more and 9 or less, further preferably 2 or more and 9 or less, and 2 or more. 5 or less is more preferable. In the present disclosure, the pH of the immersion liquid composition is a value at 25 ° C. and can be measured using a pH meter, and specifically, can be measured by the method described in Examples.
本開示の浸漬液組成物は、一又は複数の実施形態において、半導体基板の製造工程で用いることができる。例えば、本開示の浸漬液組成物は、一又は複数の実施形態において、研磨された半導体基板の表面処理に用いられる。本開示の浸漬液組成物は、一又は複数の実施形態において、洗浄剤又はリンス剤として使用されるものではない。半導体基板としては、例えば、単結晶シリコンウェーハ又はポリシリコンウェーハが挙げられる。すなわち、本開示の浸漬液組成物は、一又は複数の実施形態において、単結晶シリコンウェーハ又はポリシリコンウェーハ用の浸漬液組成物である。 The immersion liquid composition of the present disclosure can be used in one or more embodiments in the process of manufacturing a semiconductor substrate. For example, the immersion liquid composition of the present disclosure is used in one or more embodiments for surface treatment of a polished semiconductor substrate. The immersion liquid composition of the present disclosure is not used as a cleaning agent or a rinsing agent in one or more embodiments. Examples of the semiconductor substrate include a single crystal silicon wafer or a polysilicon wafer. That is, the immersion liquid composition of the present disclosure is an immersion liquid composition for a single crystal silicon wafer or a polysilicon wafer in one or more embodiments.
[半導体基板の製造方法]
本開示は、その他の態様において、下記工程(1)及び(2)を含む、半導体基板の製造方法(以下、「本開示の半導体基板製造方法」ともいう)に関する。
(1)研磨された半導体基板を、本開示の浸漬液組成物に浸漬させる工程(以下、「浸漬工程」ともいう)。
(2)工程(1)で得られる半導体基板を、洗浄剤組成物を用いて洗浄する工程(以下、「洗浄工程」ともいう)。
[Manufacturing method of semiconductor substrate]
The present disclosure relates to a semiconductor substrate manufacturing method (hereinafter, also referred to as "semiconductor substrate manufacturing method of the present disclosure") including the following steps (1) and (2) in another aspect.
(1) A step of immersing the polished semiconductor substrate in the dipping solution composition of the present disclosure (hereinafter, also referred to as "immersion step").
(2) A step of cleaning the semiconductor substrate obtained in the step (1) with a cleaning agent composition (hereinafter, also referred to as a “cleaning step”).
[工程(1):浸漬工程]
工程(1)は、研磨された半導体基板を、本開示の浸漬液組成物に浸漬させる工程(浸漬工程)である。工程(1)は、一又は複数の実施形態において、研磨された半導体基板を本開示の浸漬液組成物に浸漬し、工程(2)に運ばれるまで保管する工程であってもよい。したがって、本開示の浸漬液組成物は、一又は複数の実施形態において、研磨された半導体基板の保管に用いることができる。
[Step (1): Immersion step]
The step (1) is a step (immersion step) of immersing the polished semiconductor substrate in the immersion liquid composition of the present disclosure. In one or more embodiments, the step (1) may be a step of immersing the polished semiconductor substrate in the dipping solution composition of the present disclosure and storing it until it is carried to the step (2). Therefore, the immersion liquid composition of the present disclosure can be used for storage of a polished semiconductor substrate in one or more embodiments.
工程(1)において、浸漬液組成物の温度(浸漬温度)は、ウェーハ表面上の残留物低減の観点から、10℃以上が好ましく、13℃以上がより好ましく、15℃以上が更に好ましく、18℃超が更に好ましく、そして、同様の観点から、40℃以下が好ましく、30℃以下がより好ましく、25℃以下が更に好ましい。より具体的には、浸漬温度は、10℃以上40℃以下が好ましく、13℃以上40℃以下が好ましく、15℃以上40℃以下が更に好ましく、18℃超40℃以下が更に好ましく、18℃超30℃以下が更に好ましく、18℃超25℃以下が更に好ましい。 In the step (1), the temperature (immersion temperature) of the immersion liquid composition is preferably 10 ° C. or higher, more preferably 13 ° C. or higher, further preferably 15 ° C. or higher, and even more preferably 15 ° C. or higher, from the viewpoint of reducing residues on the wafer surface. More than ° C. is more preferable, and from the same viewpoint, 40 ° C. or lower is preferable, 30 ° C. or lower is more preferable, and 25 ° C. or lower is further preferable. More specifically, the immersion temperature is preferably 10 ° C. or higher and 40 ° C. or lower, preferably 13 ° C. or higher and 40 ° C. or lower, further preferably 15 ° C. or higher and 40 ° C. or lower, further preferably 18 ° C. or higher and 40 ° C. or lower, and further preferably 18 ° C. It is more preferably more than 30 ° C. and lower than 25 ° C.
工程(1)において、研磨された半導体基板の浸漬液組成物への浸漬時間は、ウェーハ表面上の残留物低減の観点から、0.1分以上が好ましく、1分以上がより好ましく、5分以上が更に好ましく、10分以上が更により好ましい、そして、同様の観点から、1440分以下が好ましく、720分以下がより好ましく、360分以下が好ましく、180分以下が更に好ましい。より具体的には、浸漬時間は、0.1分以上1440分以下が好ましく、5分以上720分以下がより好ましく、10分以上360分以下が更に好ましく、10分以上180分以下が更に好ましい。 In the step (1), the immersion time of the polished semiconductor substrate in the immersion liquid composition is preferably 0.1 minutes or more, more preferably 1 minute or more, and 5 minutes from the viewpoint of reducing residues on the wafer surface. The above is even more preferable, 10 minutes or more is even more preferable, and from the same viewpoint, 1440 minutes or less is more preferable, 720 minutes or less is more preferable, 360 minutes or less is more preferable, and 180 minutes or less is further preferable. More specifically, the immersion time is preferably 0.1 minutes or more and 1440 minutes or less, more preferably 5 minutes or more and 720 minutes or less, further preferably 10 minutes or more and 360 minutes or less, and further preferably 10 minutes or more and 180 minutes or less. ..
[工程(2):洗浄工程]
工程(2)は、工程(1)で得られた半導体基板を、洗浄剤組成物を用いて洗浄する工程(洗浄工程)である。洗浄剤組成物は、一又は複数の実施形態において、ウェーハ表面上の残留物低減の観点から、有機化合物を実質的に含まないことが好ましい。ここで、洗浄剤組成物が有機化合物を実質的に含まないとは、洗浄剤組成物中の有機化合物の含有量が0.1質量%以下、好ましくは0.05質量%以下、より好ましくは実質的に0質量%であることをいう。工程(2)で用いられる洗浄剤組成物の一実施形態としては、例えば、過酸化水素、アンモニア、塩酸、硫酸、フッ酸及びオゾン水から選ばれる少なくとも1種を含む無機物洗浄剤が挙げられる。
[Step (2): Cleaning step]
The step (2) is a step (cleaning step) of cleaning the semiconductor substrate obtained in the step (1) with a cleaning agent composition. In one or more embodiments, the cleaning agent composition preferably contains substantially no organic compounds from the viewpoint of reducing residues on the wafer surface. Here, the fact that the detergent composition does not substantially contain the organic compound means that the content of the organic compound in the detergent composition is 0.1% by mass or less, preferably 0.05% by mass or less, more preferably. It means that it is substantially 0% by mass. One embodiment of the detergent composition used in step (2) includes, for example, an inorganic detergent containing at least one selected from hydrogen peroxide, ammonia, hydrochloric acid, sulfuric acid, hydrofluoric acid and ozone water.
工程(2)の洗浄は、ウェーハ表面上の残留物低減の観点から、無機物洗浄が好ましく、例えば、一般的に用いられているRCA洗浄やSCROD洗浄を用いることができる。
ここで、RCA洗浄とは、基本的には、ウェーハ表面に付着したパーティクルの除去に使用されるSC1洗浄、及び、ウェーハ表面に付着した重金属の除去に使用されるSC2洗浄を含み、必要に応じて、ウェーハ表面に付着した有機物の除去に使用されるSPM洗浄、及び、ウェーハ表面の不要な酸化膜の除去に使用されるDHF洗浄を含むものである。SCROD洗浄は、パーティクルの除去や重金属の除去に使用されるものである。RCA洗浄及びSCROD洗浄の洗浄方法としては、例えば、浸漬洗浄法や枚葉洗浄法が挙げられる。
SC1洗浄では、例えば、アンモニアと過酸化水素と水とからなる洗浄剤組成物が用いられる。SC2洗浄では、例えば、塩酸と過酸化水素水と水とからなる洗浄剤組成物が用いられる。SPM洗浄では、例えば、硫酸と過酸化水素水とからなる洗浄剤組成物が用いられる。DHF洗浄では、例えば、フッ酸と水とからなる洗浄剤組成物が用いられる。SCROD洗浄では、オゾン水やフッ酸が用いられる。
上述した洗浄の各洗浄工程の後に、水でリンスし、乾燥する工程が含まれていてもよい。
The cleaning in the step (2) is preferably an inorganic substance cleaning from the viewpoint of reducing residues on the wafer surface, and for example, generally used RCA cleaning and SCROD cleaning can be used.
Here, the RCA cleaning basically includes SC1 cleaning used for removing particles adhering to the wafer surface and SC2 cleaning used for removing heavy metals adhering to the wafer surface, if necessary. It includes SPM cleaning used for removing organic substances adhering to the wafer surface and DHF cleaning used for removing unnecessary oxide film on the wafer surface. SCROD cleaning is used for removing particles and heavy metals. Examples of the cleaning method for RCA cleaning and SCROD cleaning include a dipping cleaning method and a single-wafer cleaning method.
In SC1 cleaning, for example, a detergent composition composed of ammonia, hydrogen peroxide, and water is used. In SC2 cleaning, for example, a detergent composition composed of hydrochloric acid, hydrogen peroxide solution, and water is used. In SPM cleaning, for example, a detergent composition composed of sulfuric acid and hydrogen peroxide solution is used. In DHF cleaning, for example, a detergent composition composed of hydrofluoric acid and water is used. Ozone water and hydrofluoric acid are used in SCROD cleaning.
After each cleaning step of the cleaning described above, a step of rinsing with water and drying may be included.
本開示の半導体基板製造方法は、一又は複数の実施形態において、前記浸漬工程の前に、研磨液組成物を用いて半導体基板を研磨する工程(研磨工程)を含むことができる。前記研磨工程は、一又は複数の実施形態において、最終の研磨工程及び/又は仕上げ研磨工程であることが好ましい。研磨液組成物の一実施形態としては、シリカ等の砥粒を含む研磨液組成物が挙げられる。 In one or more embodiments, the semiconductor substrate manufacturing method of the present disclosure may include a step (polishing step) of polishing a semiconductor substrate with a polishing liquid composition before the dipping step. In one or more embodiments, the polishing step is preferably a final polishing step and / or a finish polishing step. One embodiment of the polishing liquid composition includes a polishing liquid composition containing abrasive grains such as silica.
以下、実施例により本開示をさらに詳細に説明するが、これらは例示的なものであって、本開示はこれら実施例に制限されるものではない。 Hereinafter, the present disclosure will be described in more detail by way of examples, but these are exemplary and the present disclosure is not limited to these examples.
1.ポリマーA1〜A6(成分A又は非成分A)の調製
表1に示すポリマーA1〜A6の調製には、下記原料を用いた。
1. 1. Preparation of Polymers A1 to A6 (Component A or Non-Component A) The following raw materials were used to prepare the polymers A1 to A6 shown in Table 1.
<モノマーa1>
MAA:メタクリル酸(東京化成工業株式会社製)
AA:アクリル酸(富士フィルム和光純薬工業株式会社製)
<Monomer a1>
MAA: Methacrylic acid (manufactured by Tokyo Chemical Industry Co., Ltd.)
AA: Acrylic acid (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.)
<モノマーa2>
(モノマーa2−1)
メトキシポリエチレングリコールアリルエーテル(平均分子量1500、EO平均付加モル数32)、ユニオックスPKA−5010(日油株式会社製)
(モノマーa2−2)
ポリエチレングリコール−3−メチル−3−ブテニルエーテル(EO平均付加モル数50)
(モノマーa2−3)
ポリエチレングリコールアリルエーテル(EO平均付加モル数25)
<Monomer a2>
(Monomer a2-1)
Methoxypolyethylene glycol allyl ether (average molecular weight 1500, EO average number of moles added 32), Uniox PKA-5010 (manufactured by NOF CORPORATION)
(Monomer a2-2)
Polyethylene glycol-3-methyl-3-butenyl ether (EO average number of moles added 50)
(Monomer a2-3)
Polyethylene glycol allyl ether (EO average number of moles added 25)
<重合連鎖移動剤>
2−メルカプトエタノール(東京化成工業株式会社製)
β−メルカプトプロピオン酸(東京化成工業株式会社製)
<重合連鎖移動剤兼溶媒>
1,2−プロパンジオール(富士フィルム和光純薬工業株式会社製)
<重合開始剤>
ペルオキソ二硫酸アンモニウム(過硫酸アンモニウム)(ナカライテスク株式会社製)
過酸化水素水(30〜35.5質量%水溶液、ナカライテスク株式会社製)
ペルオキソ二硫酸ナトリウム(ナカライテスク株式会社製)
<中和剤>
水酸化ナトリウム(48質量%NaOH、旭硝子株式会社製)
なお、中和剤に用いた水酸化ナトリウムは、成分Cに含まれない。
<Polymerization chain transfer agent>
2-Mercaptoethanol (manufactured by Tokyo Chemical Industry Co., Ltd.)
β-Mercaptopropionic acid (manufactured by Tokyo Chemical Industry Co., Ltd.)
<Polymerization chain transfer agent and solvent>
1,2-Propanediol (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.)
<Polymerization initiator>
Ammonium peroxodisulfate (ammonium persulfate) (manufactured by Nacalai Tesque, Inc.)
Hydrogen peroxide solution (30-35.5% by mass aqueous solution, manufactured by Nacalai Tesque, Inc.)
Sodium peroxodisulfate (manufactured by Nacalai Tesque, Inc.)
<Neutralizer>
Sodium hydroxide (48% by mass NaOH, manufactured by Asahi Glass Co., Ltd.)
The sodium hydroxide used as the neutralizing agent is not included in the component C.
[ポリマーA1の製造例]
攪拌機付反応容器に水:90.5g(5.0モル)を仕込み、攪拌しながら窒素置換し、窒素雰囲気中で75℃まで昇温した。MAA:63.7g(0.65モル)とモノマーa2−1:525g(0.35モル)(質量比=11/89、モル比=65/35)、水:161g(8.9モル)を混合溶解したものと、10質量%過硫酸アンモニウム水溶液:37.0gをそれぞれ同時に反応系に2時間かけて滴下した。次に10質量%過硫酸アンモニウム水溶液:14.8gを30分かけて滴下し、3時間同温度(75℃)で熟成した。熟成終了後、48質量%水酸化ナトリウム水溶液を108g加えて中和し、その後、カラムに陽イオン交換樹脂(イオン交換樹脂:三菱ケミカル製 DIAION SK1BH)を100ml充填し、熟成終了後の中和物を固形分濃度が30質量%となるように水で希釈したものを空間速度SV値が4.0となる条件でイオン交換処理することにより、ナトリウム含有量が1ppm以下のポリマーA1(30質量%水溶液)を得た。
[Production example of polymer A1]
Water: 90.5 g (5.0 mol) was charged into a reaction vessel equipped with a stirrer, nitrogen was substituted while stirring, and the temperature was raised to 75 ° C. in a nitrogen atmosphere. MAA: 63.7 g (0.65 mol), monomer a2-1: 525 g (0.35 mol) (mass ratio = 11/89, molar ratio = 65/35), water: 161 g (8.9 mol) The mixed-dissolved product and 37.0 g of a 10 mass% ammonium persulfate aqueous solution were simultaneously added dropwise to the reaction system over 2 hours. Next, 14.8 g of a 10 mass% ammonium persulfate aqueous solution was added dropwise over 30 minutes, and the mixture was aged at the same temperature (75 ° C.) for 3 hours. After the aging is completed, 108 g of a 48 mass% sodium hydroxide aqueous solution is added to neutralize the column, and then 100 ml of a cation exchange resin (ion exchange resin: DIAION SK1BH manufactured by Mitsubishi Chemical Co., Ltd.) is filled in the column. Was diluted with water so that the solid content concentration was 30% by mass, and ion exchange treatment was performed under the condition that the space velocity SV value was 4.0, so that the polymer A1 (30% by mass) having a sodium content of 1 ppm or less was treated. Aqueous solution) was obtained.
[ポリマーA2の製造例]
攪拌機付反応容器に水:234g(13.0モル)、モノマーa2−2:546g(0.24モル)を仕込み、攪拌しながら窒素置換し、窒素雰囲気中で65℃まで昇温し、過酸化水素水8.6gを滴下した。次にAA:54.4g(0.76モル)及び水:45.6g(2.5モル)を混合溶解したものと、β−メルカプトプロピオン酸:8.0g、L−アスコルビン酸3.3g及び水:38.8gを混合溶解したものを、それぞれ同時に反応系に2時間かけて滴下した。その後、1時間同温度(65℃)で熟成した。熟成終了後、48質量%水酸化ナトリウム水溶液を62.9g加えて中和し、その後、カラムに陽イオン交換樹脂(イオン交換樹脂:三菱ケミカル製 DIAION SK1BH)を100ml充填し、熟成終了後の中和物を固形分濃度が30質量%となるように水で希釈したものを空間速度SV値が4.0となる条件でイオン交換処理することにより、ナトリウム含有量が1ppm以下のポリマーA2(30質量%水溶液)を得た(AA/モノマーa2−2質量比=9/91、モル比=76/24)。
[Production example of polymer A2]
Water: 234 g (13.0 mol) and monomer a2-2: 546 g (0.24 mol) were charged in a reaction vessel with a stirrer, nitrogen was substituted while stirring, the temperature was raised to 65 ° C. in a nitrogen atmosphere, and hydrogen peroxide was applied. 8.6 g of hydrogen peroxide water was added dropwise. Next, AA: 54.4 g (0.76 mol) and water: 45.6 g (2.5 mol) were mixed and dissolved, β-mercaptopropionic acid: 8.0 g, L-ascorbic acid 3.3 g and Water: 38.8 g of the mixture was mixed and dissolved, and each of them was simultaneously added dropwise to the reaction system over 2 hours. Then, it was aged at the same temperature (65 ° C.) for 1 hour. After the aging is completed, 62.9 g of 48 mass% sodium hydroxide aqueous solution is added to neutralize the column, and then 100 ml of a cation exchange resin (ion exchange resin: DIAION SK1BH manufactured by Mitsubishi Chemical Co., Ltd.) is filled in the column. The Japanese product diluted with water so that the solid content concentration is 30% by mass is ion-exchanged under the condition that the space velocity SV value is 4.0, so that the polymer A2 (30) having a sodium content of 1 ppm or less is treated. (Mass% aqueous solution) was obtained (AA / monomer a2-2 mass ratio = 9/91, molar ratio = 76/24).
[ポリマーA3の製造例]
攪拌機付反応容器に水:193g(10.7モル)、1,2−プロパンジオール:295g(3.9モル)、AA:5.0g(0.069モル)、モノマーa2−3:150g(0.13モル)を仕込み、攪拌しながら窒素置換し、窒素雰囲気中で85℃まで昇温した。AA:49.7g(0.69モル)とモノマーa2−3:150g(0.13モル)及び水:50.3g(2.8モル)を混合溶解したものと、ペルオキソ二硫酸ナトリウム:5.3g及び水:21.2gを混合溶解したものを、それぞれ同時に反応系に75分かけて滴下した。次に、AA:45.1g(0.63モル)、ペルオキソ二硫酸ナトリウム:4.8g及び水:30.3gを混合溶解したものを、それぞれ同時に反応系に135分かけて滴下した。その後、3時間同温度(85℃)で熟成した。熟成終了後、48質量%水酸化ナトリウム水溶液を52.2g加えて中和し、その後、カラムに陽イオン交換樹脂(イオン交換樹脂:三菱ケミカル製 DIAION SK1BH)を100ml充填し、熟成終了後の中和物を固形分濃度が20質量%となるように水で希釈したものを空間速度SV値が4.0となる条件でイオン交換処理することにより、ナトリウム含有量が1ppm以下のポリマーA3(20質量%溶液)を得た(AA/モノマーa2−3質量比=25/75、モル比=84/16)。
[Production example of polymer A3]
Water: 193 g (10.7 mol), 1,2-propanediol: 295 g (3.9 mol), AA: 5.0 g (0.069 mol), monomer a2-3: 150 g (0) in a reaction vessel with a stirrer .13 mol) was charged, nitrogen was substituted with stirring, and the temperature was raised to 85 ° C. in a nitrogen atmosphere. AA: 49.7 g (0.69 mol), monomer a2-3: 150 g (0.13 mol) and water: 50.3 g (2.8 mol) mixed and dissolved, and sodium peroxodisulfate: 5. A mixture of 3 g and 21.2 g of water was simultaneously added dropwise to the reaction system over 75 minutes. Next, AA: 45.1 g (0.63 mol), sodium peroxodisulfate: 4.8 g, and water: 30.3 g were mixed and dissolved, and each of them was simultaneously added dropwise to the reaction system over 135 minutes. Then, it was aged at the same temperature (85 ° C.) for 3 hours. After the aging is completed, 52.2 g of a 48 mass% sodium hydroxide aqueous solution is added to neutralize the column, and then 100 ml of a cation exchange resin (ion exchange resin: DIAION SK1BH manufactured by Mitsubishi Chemical Co., Ltd.) is filled in the column. The Japanese product diluted with water so that the solid content concentration is 20% by mass is ion-exchanged under the condition that the space velocity SV value is 4.0, so that the polymer A3 (20) having a sodium content of 1 ppm or less is treated. A mass% solution) was obtained (AA / monomer a2-3 mass ratio = 25/75, molar ratio = 84/16).
[ポリマーA4]
アクリル酸/ポリエチレングリコールアクリル酸エステル(EO平均付加モル数5、重量平均分子量3,000、花王社製)
[ポリマーA5]
ポリアクリル酸(重量平均分子量20,000、ナカライテスク社製)
[ポリマーA6]
ポリエチレングリコール(重量平均分子量20,000、富士フィルム和光純薬工業社製)
[Polymer A4]
Acrylic acid / polyethylene glycol Acrylic acid ester (EO average number of moles added 5, weight average molecular weight 3,000, manufactured by Kao Corporation)
[Polymer A5]
Polyacrylic acid (weight average molecular weight 20,000, manufactured by Nacalai Tesque)
[Polymer A6]
Polyethylene glycol (weight average molecular weight 20,000, manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.)
[重量平均分子量の測定]
ポリマーの重量平均分子量は、ゲルパーミエーションクロマトグラフィー(以下「GPC」ともいう)法を用いて下記条件で測定した。測定結果を表1に示した。
[GPC条件]
カラム:G4000PWXL+G2500PWXL(東ソー株式会社製)
溶離液:0.2Mリン酸バッファー/CH3CN=9/1(体積比)
流量:1.0mL/min
カラム温度:40℃
検出:RI
サンプルサイズ:0.5mg/mL
標準物質:ポリエチレングリコール換算
[Measurement of weight average molecular weight]
The weight average molecular weight of the polymer was measured under the following conditions using a gel permeation chromatography (hereinafter, also referred to as “GPC”) method. The measurement results are shown in Table 1.
[GPC conditions]
Column: G4000PWXL + G2500PWXL (manufactured by Tosoh Corporation)
Eluent: 0.2M phosphate buffer / CH 3 CN = 9/1 (volume ratio)
Flow rate: 1.0 mL / min
Column temperature: 40 ° C
Detection: RI
Sample size: 0.5 mg / mL
Standard substance: Polyethylene glycol equivalent
2.浸漬液組成物の調製
表2及び表3に示す各成分を混合し、実施例1〜10及び比較例1〜6の浸漬液組成物を調製した。pH調整には、クエン酸、アンモニアを用いた。表2及び表3における各成分の含有量は、浸漬液組成物の使用時における各成分の含有量(質量%、有効分)である。調製した実施例1〜10及び比較例3の浸漬液組成物中のナトリウム含有量は1ppm以下であった。
2. Preparation of immersion liquid composition The immersion liquid compositions of Examples 1 to 10 and Comparative Examples 1 to 6 were prepared by mixing the components shown in Tables 2 and 3. Citric acid and ammonia were used for pH adjustment. The content of each component in Tables 2 and 3 is the content (mass%, effective content) of each component when the immersion liquid composition is used. The sodium content in the prepared immersion liquid compositions of Examples 1 to 10 and Comparative Example 3 was 1 ppm or less.
浸漬液組成物の調製において、ポリマー(成分A又は非成分A)として、上述したものを使用した。成分B、成分C及び成分Dには、下記のものを使用した。
(成分B)
水:超純水
(成分C)
NH3:アンモニア[関東化学社製、29質量%アンモニア水]
MEA:モノエタノールアミン[富士フィルム和光純薬工業社製]
(成分D)
クエン酸[扶桑化学工業社製]
リンゴ酸[扶桑化学工業社製]
マレイン酸[富士フィルム和光純薬工業社製]
In the preparation of the immersion liquid composition, the above-mentioned polymer (component A or non-component A) was used. The following were used as component B, component C and component D.
(Component B)
Water: Ultrapure water (component C)
NH 3 : Ammonia [manufactured by Kanto Chemical Co., Inc., 29% by mass ammonia water]
MEA: Monoethanolamine [manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.]
(Component D)
Citric acid [manufactured by Fuso Chemical Industry Co., Ltd.]
Malic acid [manufactured by Fuso Chemical Industry Co., Ltd.]
Maleic acid [manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.]
[浸漬液組成物のpH]
浸漬液組成物の25℃におけるpH値は、pHメータ(東亜電波工業社製、「HM−30G」)を用いて測定した値であり、pHメータの電極を浸漬液組成物へ浸漬して1分後の数値である。
[PH of immersion liquid composition]
The pH value of the immersion liquid composition at 25 ° C. is a value measured using a pH meter (manufactured by Toa Denpa Kogyo Co., Ltd., “HM-30G”), and the electrode of the pH meter is immersed in the immersion liquid composition 1 It is a numerical value after minutes.
[浸漬液組成物中のナトリウム含有量]
浸漬液組成物中のナトリウム含有量の測定は、ICP質量分析装置(Agilent社製、型名:7700s、ICP−MS)にて内標準法で定量を行い、同時に実施した操作ブランク値を差し引いて含有量を求めた。
[Sodium content in immersion liquid composition]
The sodium content in the immersion liquid composition was measured by an ICP mass spectrometer (manufactured by Agilent, model name: 7700s, ICP-MS) by the internal standard method, and the operation blank value performed at the same time was subtracted. The content was determined.
3.浸漬による評価
[浸漬による除去性(Si溶出量)]
下記の評価用シリコンウェーハを用い、浸漬によるウェーハ表面の残留物の除去性の評価を以下のようにして行った。
<評価用シリコンウェーハ>
単結晶シリコンウェーハ[直径200mmのシリコン片面鏡面ウェーハ、伝導型:P、結晶方位:100、抵抗率:0.1Ω・cm以上100Ω・cm未満]
ポリシリコンウェーハ[直径200mmのシリコン片面鏡面ウェーハ、伝導型:P、結晶方位:100、抵抗率:0.1Ω・cm以上100Ω・cm未満の上にSiO2膜を4400Å分プラズマCVD法により堆積させ、続いてポリシリコン膜を8000Å同じくプラズマCVD法により堆積させたウェーハ]
<浸漬による除去性の評価方法>
(1)4cm×4cmにカットした評価用シリコンウェーハを、1質量%フッ酸水溶液でシリコン撥水処理した。
(2)シリカ粒子(コロイダルシリカ、平均二次粒子径70nm、扶桑化学社製の「PL-3」)、HEC(重量平均分子量80万、住友精化社製の「CF-V」)、アンモニア及び超純水を混合して研磨液組成物を調製した。研磨液組成物中の各成分の含有量は、シリカ粒子が0.3質量%、HECが0.015質量%、アンモニアが0.015質量%であり、その残余が超純水である。研磨液組成物のpHは、10.7であった。
(3)調製した研磨液組成物(温度25℃)100mLにシリコン撥水処理したシリコンウェーハを1分間浸漬した。
(4)研磨液組成物中からシリコンウェーハを引き上げ、流水で5秒間水洗いした。
(5)水洗いしたシリコンウェーハ(表面積0.0016m2)を、調製した各浸漬液組成物(温度25℃)0.1Lに30分間浸漬した。
(6)浸漬液組成物からシリコンウェーハを静かに取り出し、浸漬液組成物中のSi濃度(ppb)を、核誘導結合プラズマ質量分析装置(ICP−MS、アジレント製、7700S)を用いて測定した。測定結果を表2〜3に示した。なお、表2は、単結晶シリコンウェーハ表面の残留物の除去性の評価結果を示し、表3は、ポリシリコンウェーハ表面の残留物の除去性の評価結果を示す。浸漬液組成物中のSi濃度が高いほど、ウェーハ表面から残留物が除去され、ウェーハ表面上の残留物が低減されたと判断できる。
3. 3. Evaluation by immersion [Removability by immersion (Si elution amount)]
Using the following evaluation silicon wafer, the removability of the residue on the wafer surface by immersion was evaluated as follows.
<Silicon wafer for evaluation>
Single crystal silicon wafer [Silicone single-sided mirror wafer with a diameter of 200 mm, conduction type: P, crystal orientation: 100, resistivity: 0.1 Ω · cm or more and less than 100 Ω · cm]
Polysilicon wafer [Silicone single-sided mirror wafer with a diameter of 200 mm, conduction type: P, crystal orientation: 100, resistance: 0.1 Ω · cm or more and less than 100 Ω · cm, SiO 2 film is deposited for 4400 Å by plasma CVD method. , Subsequently, a wafer in which a polysilicon film was deposited by the plasma CVD method for 8000 Å]
<Evaluation method of removability by immersion>
(1) A silicon wafer for evaluation cut into 4 cm × 4 cm was treated with a 1 mass% hydrofluoric acid aqueous solution to make it water repellent.
(2) Silica particles (coloidal silica, average secondary particle size 70 nm, "PL-3" manufactured by Fuso Chemical Co., Ltd.), HEC (weight average molecular weight 800,000, "CF-V" manufactured by Sumitomo Seika Chemical Co., Ltd.), ammonia And ultrapure water were mixed to prepare a polishing liquid composition. The content of each component in the polishing liquid composition is 0.3% by mass of silica particles, 0.015% by mass of HEC, 0.015% by mass of ammonia, and the remainder is ultrapure water. The pH of the polishing liquid composition was 10.7.
(3) A silicon wafer treated with silicon water repellent was immersed in 100 mL of the prepared polishing liquid composition (temperature 25 ° C.) for 1 minute.
(4) The silicon wafer was pulled up from the polishing liquid composition and washed with running water for 5 seconds.
(5) The silicon wafer (surface area 0.0016 m 2 ) washed with water was immersed in 0.1 L of each prepared immersion liquid composition (temperature 25 ° C.) for 30 minutes.
(6) The silicon wafer was gently taken out from the immersion liquid composition, and the Si concentration (ppb) in the immersion liquid composition was measured using a nuclear inductively coupled plasma mass spectrometer (ICP-MS, manufactured by Azilent, 7700S). .. The measurement results are shown in Tables 2 and 3. Table 2 shows the evaluation results of the removability of the residue on the surface of the single crystal silicon wafer, and Table 3 shows the evaluation results of the removability of the residue on the surface of the polysilicon wafer. It can be determined that the higher the Si concentration in the immersion liquid composition, the more the residue is removed from the wafer surface and the residue on the wafer surface is reduced.
[浸漬による濡れ性]
各浸漬液組成物のシリコンウェーハに対する濡れ性を目視で確認したところ、実施例1〜10の浸漬液組成物は、成分Aを含有しない系(水のみ、及び、比較例1〜4)に比べて、シリコンウェーハに対する濡れ性が向上していることを確認した。
[Wetability due to immersion]
When the wettability of each immersion liquid composition to the silicon wafer was visually confirmed, the immersion liquid compositions of Examples 1 to 10 were compared with the systems containing no component A (water only and Comparative Examples 1 to 4). It was confirmed that the wettability with respect to the silicon wafer was improved.
4.研磨工程、浸漬工程及び洗浄工程後の表面欠陥の評価
[清浄性(LPD)]
下記の評価用シリコンウェーハを用い、ウェーハ表面の表面欠陥(LPD)の評価を以下のようにして行った。
<評価用シリコンウェーハ>
単結晶シリコンウェーハ[直径200mmのシリコン片面鏡面ウェーハ、伝導型:P、結晶方位:100、抵抗率:0.1Ω・cm以上100Ω・cm未満]
ポリシリコンウェーハ[直径200mmのシリコン片面鏡面ウェーハ、伝導型:P、結晶方位:100、抵抗率:0.1Ω・cm以上100Ω・cm未満の上にSiO2膜を4400Å分プラズマCVD法により堆積させ、続いてポリシリコン膜を8000Å同じくプラズマCVD法により堆積させたウェーハ]
<仕上げ研磨工程>
シリカ粒子(コロイダルシリカ、平均二次粒子径70nm、扶桑化学社製の「PL-3」)、HEC(重量平均分子量80万、住友精化社製の「CF-V」)、アンモニア及び超純水を混合して仕上げ研磨用研磨液組成物を調製した。研磨液組成物中の各成分の含有量は、シリカ粒子が0.3質量%、HECが0.015質量%、アンモニアが0.015質量%であり、その残余が超純水である。仕上げ研磨用研磨液組成物のpHは、10.5であった。
調製した仕上げ研磨液組成物を用いて、評価用シリコンウェーハを下記仕上げ研磨条件で仕上げ研磨を行った。当該仕上げ研磨に先だって評価用シリコンウェーハに対し市販の研磨液組成物を用いて予め粗研磨を実施した。粗研磨を終了し仕上げ研磨に供したシリコンウェーハの表面粗さ(Haze)は、5.13ppm(DWO)及び9.77ppm(DNN)であった。Hazeの測定値は、後述する表面欠陥の測定と同じ方法を用いて測定したものである。
(仕上げ研磨条件)
研磨機:片面8インチ研磨機「GRIND−X SPP600s」(岡本工作製)
研磨パッド:スエードパッド(東レ コーテックス社製、アスカー硬度:64、厚さ:1.37mm、ナップ長:450um、開口径:60um)
シリコンウェーハ研磨圧力:100g/cm2
定盤回転速度:60rpm
研磨時間:5分
研磨液組成物の供給速度:150g/cm2
研磨液組成物の温度:23℃
キャリア回転速度:62rpm
<浸漬工程>
研磨工程後の直径200mmシリコンウェーハを、調製した各浸漬液組成物(温度25℃)5Lに30分間浸漬した。
<洗浄工程>
浸漬工程後のシリコンウェーハに対して、オゾン洗浄と希フッ酸洗浄を下記のとおり行った。オゾン洗浄では、20ppmのオゾンを含んだ水溶液をノズルから流速1L/min、600rpmで回転するシリコンウェーハの中央に向かって3分間噴射した。このときオゾン水の温度は常温とした。次に希フッ酸洗浄を行った。希フッ酸洗浄では、0.5質量%のフッ化水素アンモニウム(特級、ナカライテスク株式会社)を含んだ水溶液をノズルから流速1L/min、600rpmで回転するシリコンウェーハの中央に向かって6秒間噴射した。上記オゾン洗浄と希フッ酸洗浄を1セットとして計2セット行い、最後にスピン乾燥を行った。スピン乾燥では1,500rpmでシリコンウェーハを回転させた。
<表面欠陥(LPD)の測定>
測定機器:表面粗さ測定装置「Surfscan SP1−DLS」(KLA Tencor社製)
評価:洗浄後のウェーハ表面上の粒径が45nm以上のパーティクル数を測定することによって評価した。表面欠陥(LPD)の評価結果は、数値が小さいほど表面欠陥が少なく、清浄性に優れていることを示す。表面欠陥(LPD)の測定は、各々3枚のシリコンウェーハに対して行い、各々平均値を算出した。単結晶シリコンウェーハ表面の表面欠陥(LPD)の評価結果を表2に、ポリシリコンウェーハ表面の表面欠陥(LPD)の」評価結果を表3に示した。表2において、実施例1〜9及び比較例1〜4の結果は、比較例1を100とした相対値を示した。表3において、実施例10及び比較例5〜6の結果は、比較例6を100とした相対値を表3に示した。
4. Evaluation of surface defects after polishing, dipping and cleaning processes [cleanliness (LPD)]
Using the following evaluation silicon wafers, surface defects (LPD) on the wafer surface were evaluated as follows.
<Silicon wafer for evaluation>
Single crystal silicon wafer [Silicone single-sided mirror wafer with a diameter of 200 mm, conduction type: P, crystal orientation: 100, resistivity: 0.1 Ω · cm or more and less than 100 Ω · cm]
Polysilicon wafer [Silicone single-sided mirror wafer with a diameter of 200 mm, conduction type: P, crystal orientation: 100, resistance: 0.1 Ω · cm or more and less than 100 Ω · cm, SiO 2 film is deposited for 4400 Å by plasma CVD method. , Subsequently, a wafer in which a polysilicon film was deposited by the plasma CVD method for 8000 Å]
<Finishing process>
Silica particles (colloidal silica, average secondary particle size 70 nm, "PL-3" manufactured by Fuso Chemical Co., Ltd.), HEC (weight average molecular weight 800,000, "CF-V" manufactured by Sumitomo Seika Chemical Co., Ltd.), ammonia and ultrapure water Water was mixed to prepare a polishing liquid composition for finish polishing. The content of each component in the polishing liquid composition is 0.3% by mass of silica particles, 0.015% by mass of HEC, 0.015% by mass of ammonia, and the remainder is ultrapure water. The pH of the polishing liquid composition for finish polishing was 10.5.
Using the prepared finish polishing liquid composition, the silicon wafer for evaluation was finish-polished under the following finish polishing conditions. Prior to the finish polishing, the evaluation silicon wafer was subjected to rough polishing in advance using a commercially available polishing liquid composition. The surface roughness (Haze) of the silicon wafer after finishing the rough polishing and subjecting to the finish polishing was 5.13 ppm (DWO) and 9.77 ppm (DNN). The measured value of Haze is measured by using the same method as the measurement of surface defects described later.
(Finish polishing conditions)
Polishing machine: Single-sided 8-inch polishing machine "GRIND-X SPP600s" (manufactured by Okamoto)
Polishing pad: Suede pad (manufactured by Toray Coatex Co., Ltd., Asker hardness: 64, thickness: 1.37 mm, nap length: 450 um, opening diameter: 60 um)
Silicon wafer polishing pressure: 100 g / cm 2
Surface plate rotation speed: 60 rpm
Polishing time: 5 minutes Supply speed of polishing liquid composition: 150 g / cm 2
Abrasive composition temperature: 23 ° C
Carrier rotation speed: 62 rpm
<Immersion process>
The silicon wafer having a diameter of 200 mm after the polishing step was immersed in 5 L of each prepared immersion liquid composition (temperature 25 ° C.) for 30 minutes.
<Washing process>
The silicon wafer after the dipping step was subjected to ozone cleaning and dilute hydrofluoric acid cleaning as follows. In ozone cleaning, an aqueous solution containing 20 ppm ozone was sprayed from a nozzle toward the center of a silicon wafer rotating at a flow rate of 1 L / min and 600 rpm for 3 minutes. At this time, the temperature of ozone water was set to room temperature. Next, dilute hydrofluoric acid washing was performed. In dilute hydrofluoric acid cleaning, an aqueous solution containing 0.5% by mass of ammonium hydrogen fluoride (special grade, Nacalai Tesque, Inc.) is injected from a nozzle toward the center of a silicon wafer rotating at a flow rate of 1 L / min and 600 rpm for 6 seconds. did. A total of two sets of the above ozone cleaning and dilute hydrofluoric acid cleaning were performed as one set, and finally spin drying was performed. In spin drying, the silicon wafer was rotated at 1,500 rpm.
<Measurement of surface defects (LPD)>
Measuring equipment: Surface roughness measuring device "Surfscan SP1-DLS" (manufactured by KLA Tencor)
Evaluation: Evaluation was performed by measuring the number of particles having a particle size of 45 nm or more on the wafer surface after cleaning. The evaluation result of the surface defect (LPD) shows that the smaller the value, the smaller the surface defect and the better the cleanliness. The surface defects (LPD) were measured for each of three silicon wafers, and the average value was calculated for each. Table 2 shows the evaluation results of surface defects (LPD) on the surface of a single crystal silicon wafer, and Table 3 shows the evaluation results of surface defects (LPD) on the surface of a polysilicon wafer. In Table 2, the results of Examples 1 to 9 and Comparative Examples 1 to 4 show relative values with Comparative Example 1 as 100. In Table 3, the results of Example 10 and Comparative Examples 5 to 6 show the relative values with Comparative Example 6 as 100 in Table 3.
表2に示されるように、ポリマーA(成分A)を含む浸漬液組成物を用いた実施例1〜9は、ポリマーA(成分A)を含まない比較例1〜4に比べて、研磨された単結晶シリコンウェーハ表面上の残留物の除去性が向上していた。さらに、表面欠陥(LPD)が低減されていた。
表3に示されるように、ポリマーA(成分A)を含む浸漬液組成物を用いた実施例10は、ポリマーA(成分A)を含まない比較例5〜6に比べて、研磨されたポリシリコンウェーハ表面上の残留物の除去性が向上していた。さらに、表面欠陥(LPD)が低減されていた。
As shown in Table 2, Examples 1 to 9 using the immersion liquid composition containing the polymer A (component A) were polished as compared with Comparative Examples 1 to 4 not containing the polymer A (component A). The removability of the residue on the surface of the single crystal silicon wafer was improved. In addition, surface defects (LPD) were reduced.
As shown in Table 3, Example 10 using the immersion liquid composition containing the polymer A (component A) was polished poly as compared with Comparative Examples 5 to 6 not containing the polymer A (component A). The removability of the residue on the surface of the silicon wafer was improved. In addition, surface defects (LPD) were reduced.
本開示によれば、研磨されたシリコンウェーハ表面上の残留物を低減できるため、表面欠陥が低減されたシリコンウェーハを製造でき、半導体基板の量産において有用である。 According to the present disclosure, since the residue on the surface of the polished silicon wafer can be reduced, a silicon wafer with reduced surface defects can be manufactured, which is useful in mass production of semiconductor substrates.
Claims (12)
ポリマーA:下記式(I)で表されるモノマーa1又はその無水物由来の構成単位a1と、下記式(II)で表されるモノマーa2由来の構成単位a2とを含むポリマー又はその塩。
Polymer A: A polymer or a salt thereof containing a structural unit a1 derived from the monomer a1 represented by the following formula (I) or an anhydride thereof and a structural unit a2 derived from the monomer a2 represented by the following formula (II).
(1)研磨された半導体基板を、請求項1から10のいずれかに記載の浸漬液組成物に浸漬させる工程。
(2)工程(1)で得られた半導体基板を、洗浄剤組成物を用いて洗浄する工程。 A method for manufacturing a semiconductor substrate, which comprises the following steps (1) and (2).
(1) A step of immersing a polished semiconductor substrate in the immersion liquid composition according to any one of claims 1 to 10.
(2) A step of cleaning the semiconductor substrate obtained in step (1) with a detergent composition.
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