WO2010134185A1 - 洗浄液及び洗浄方法 - Google Patents
洗浄液及び洗浄方法 Download PDFInfo
- Publication number
- WO2010134185A1 WO2010134185A1 PCT/JP2009/059371 JP2009059371W WO2010134185A1 WO 2010134185 A1 WO2010134185 A1 WO 2010134185A1 JP 2009059371 W JP2009059371 W JP 2009059371W WO 2010134185 A1 WO2010134185 A1 WO 2010134185A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cleaning
- cleaning liquid
- acid
- cerium oxide
- cleaned
- Prior art date
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- 238000004140 cleaning Methods 0.000 title claims abstract description 167
- 239000007788 liquid Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 44
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 55
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002253 acid Substances 0.000 claims abstract description 24
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 23
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 21
- -1 cerium ions Chemical class 0.000 claims abstract description 20
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims abstract description 19
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 16
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 8
- QFWPJPIVLCBXFJ-UHFFFAOYSA-N glymidine Chemical compound N1=CC(OCCOC)=CN=C1NS(=O)(=O)C1=CC=CC=C1 QFWPJPIVLCBXFJ-UHFFFAOYSA-N 0.000 claims abstract description 6
- BMYNFMYTOJXKLE-UHFFFAOYSA-N 3-azaniumyl-2-hydroxypropanoate Chemical compound NCC(O)C(O)=O BMYNFMYTOJXKLE-UHFFFAOYSA-N 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000004094 surface-active agent Substances 0.000 claims description 6
- 238000005530 etching Methods 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 239000000758 substrate Substances 0.000 description 17
- 238000005498 polishing Methods 0.000 description 14
- 239000004065 semiconductor Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 239000000126 substance Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000006061 abrasive grain Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 150000007513 acids Chemical class 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229910052814 silicon oxide Inorganic materials 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- DRVWBEJJZZTIGJ-UHFFFAOYSA-N cerium(3+);oxygen(2-) Chemical group [O-2].[O-2].[O-2].[Ce+3].[Ce+3] DRVWBEJJZZTIGJ-UHFFFAOYSA-N 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 239000005368 silicate glass Substances 0.000 description 3
- 229910021642 ultra pure water Inorganic materials 0.000 description 3
- 239000012498 ultrapure water Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 241000862969 Stella Species 0.000 description 1
- 150000007933 aliphatic carboxylic acids Chemical class 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/042—Acids
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/08—Acids
-
- 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
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/0206—Cleaning during device manufacture during, before or after processing of insulating layers
- H01L21/02065—Cleaning during device manufacture during, before or after processing of insulating layers the processing being a planarization of insulating layers
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/22—Electronic devices, e.g. PCBs or semiconductors
Definitions
- the present invention relates to a cleaning liquid capable of cleaning and removing cerium oxide from an object to be cleaned, and a cleaning method using the cleaning liquid.
- the most important process for forming a fine structure on a semiconductor substrate is an exposure / development process using an optical technique.
- focusing uniformly and uniformly on the surface of the semiconductor substrate is closely related to the flatness of the substrate surface. That is, when the flatness of the substrate surface is not good, a portion that is not in focus and a portion that is not in focus are generated on the substrate surface, and a desired fine structure cannot be formed in the portion that is not in focus, resulting in a decrease in productivity. growing. Further, as the miniaturization progresses, the allowable range regarding the flatness is reduced, and the demand for planarization of the substrate surface is further increased.
- CMP chemical mechanical polishing
- a technique using silica slurry can be mentioned.
- the silica slurry remains as a residue in the CMP step, a step of cleaning and removing the slurry is performed.
- the cleaning agent used for cleaning include a cleaning liquid described in Patent Document 1 below for the purpose of removing particles, organic impurities, and metal impurities.
- the cleaning liquid for semiconductor substrates of the following patent document 2 aiming at the removal of the particle
- An object of the present invention is to provide a cleaning liquid capable of dissolving and removing cerium oxide as cerium ions with respect to an object to be cleaned on which the cerium oxide is adhered, and a cleaning method using the same.
- the inventors of the present application examined a cleaning liquid and a cleaning method using the same in order to solve the conventional problems.
- the cleaning liquid contains hydrogen fluoride and at least one acid selected from the group consisting of hydrochloric acid, nitric acid, sulfuric acid, acetic acid, phosphoric acid, iodic acid, and hydrobromic acid, cerium oxide
- the present invention has been completed.
- the cleaning liquid according to the present invention is a cleaning liquid that removes cerium oxide in order to solve the above-described problems, and includes hydrogen fluoride, hydrochloric acid, nitric acid, sulfuric acid, acetic acid, phosphoric acid, iodic acid, and hydrogen bromide. It comprises at least one acid selected from the group consisting of acids and water, and is characterized in that the cerium oxide is dissolved and removed as cerium ions.
- the hydrogen fluoride solution can dissolve cerium oxide as cerium ions because of its strong oxidizing power.
- the dissolved cerium ions are again deposited as impurities on the surface of the object to be cleaned, and as a result, it is difficult to remove cerium oxide.
- the acid is used as a cleaning solution, since these acids have weak oxidizing power, it is difficult to dissolve cerium oxide as cerium ions and it cannot be removed.
- the cleaning liquid is a combination of hydrogen fluoride and the acid
- hydrogen fluoride dissolves in the cleaning liquid using cerium oxide as cerium ions, and the acid reattaches to the surface of the object to be cleaned. Can be removed. That is, the cleaning liquid having the above-described configuration enables cleaning and removal of cerium oxide, which was difficult with a conventional cleaning liquid.
- the cerium oxide can be effectively cleaned and removed by using the cleaning liquid of the present invention. Production efficiency can be improved.
- the hydrogen fluoride concentration is in the range of 0.001 to 20% by weight, and the acid concentration is in the range of 0.001 to 50% by weight.
- Preventing the dissolution performance of cerium oxide from deteriorating by making the concentration of hydrogen fluoride 0.001% by weight or more, and preventing the object to be cleaned from being etched by making it 20% by weight or less. Can do.
- the dissolving performance in cerium oxide is lowered by making it 50% by weight or less. Can be prevented.
- the cleaning method according to the present invention is a cleaning method using the above-described cleaning liquid in order to solve the above-described problem, and by bringing the cleaning liquid into contact with an object to be cleaned to which cerium oxide is attached, It is characterized by dissolving and removing cerium oxide as cerium ions.
- cerium oxide By bringing the cleaning liquid of the present invention into contact with the object to be cleaned attached with cerium oxide, cerium oxide can be dissolved as cerium ions in the cleaning liquid and removed without reattaching to the surface of the object to be cleaned. .
- cerium oxide residue can be washed and removed from the surface of the semiconductor substrate. Therefore, the productivity of the semiconductor device can be improved.
- the etch rate of the cleaning liquid is 10 ⁇ / min or less with respect to the object to be cleaned when the liquid temperature is 25 ° C.
- the temperature of the cleaning liquid is 30 ° C. or lower.
- the object to be cleaned is chemically mechanically polished with a cerium oxide slurry.
- the present invention has the following effects by the means described above. That is, according to the present invention, it is possible to effectively remove and remove cerium oxide, which is difficult with conventional acid cleaning solutions. As a result, for example, even if a CMP process using cerium oxide as polishing abrasive grains is employed in a semiconductor device manufacturing process, it is possible to clean and remove cerium oxide residues from the semiconductor substrate. It becomes possible to improve productivity.
- the cleaning liquid according to the present invention includes hydrogen fluoride, at least one acid selected from the group consisting of hydrochloric acid, nitric acid, sulfuric acid, acetic acid, phosphoric acid, iodic acid, and hydrobromic acid, and water. Composed. Further, the cleaning liquid according to the present invention is preferably composed mainly of the acids listed above.
- the cleaning liquid is a combination of hydrogen peroxide and the acid, it is difficult for the cleaning liquid to dissolve cerium oxide as cerium ions, so that cerium oxide cannot be removed by cleaning.
- the present invention makes it possible to dissolve cerium oxide as cerium ions by its oxidizing power by containing hydrogen fluoride in the cleaning liquid.
- the cleaning liquid of the present invention enables cleaning and removal of cerium oxide by a combination of hydrogen fluoride and the acid.
- the cerium ion means Ce 3+ , Ce 4+ , a hydrate thereof, or a complex ion thereof.
- the concentration of the hydrogen fluoride with respect to the entire cleaning liquid is preferably in the range of 0.001 to 20% by weight, and more preferably in the range of 0.001 to 5% by weight.
- concentration of hydrogen fluoride is less than 0.001% by weight, the dissolution performance for dissolving cerium oxide as cerium ions is lowered, and as a result, the cleaning effect of cerium oxide is lowered, which is not preferable.
- concentration of hydrogen fluoride exceeds 20% by weight, the object to be cleaned is etched, and the surface roughness may increase.
- the hydrogen fluoride in the cleaning liquid serving as waste water is rendered harmless after the cleaning treatment, the cost and time required for it may increase.
- hydrochloric acid nitric acid, sulfuric acid or phosphoric acid is preferred in the present invention. With these acids, the cleaning liquid in which cerium ions are dissolved can be easily removed without remaining on the surface of the object to be cleaned.
- the concentration of at least any one acid selected from the group consisting of hydrochloric acid, nitric acid, sulfuric acid, acetic acid, phosphoric acid, iodic acid, and hydrobromic acid is within the range of 0.001 to 50% by weight with respect to the entire cleaning liquid. It is preferable that it is within the range of 0.001 to 20% by weight. If the concentration of the acid is less than 0.001% by weight, the removal performance for removing cerium oxide from the object to be cleaned may deteriorate. On the other hand, if it exceeds 50% by weight, the cost and time required for detoxifying the acid in the cleaning liquid that becomes wastewater after the cleaning treatment may increase. Furthermore, volatile components may evaporate, resulting in fluctuations in the composition of the cleaning liquid, which may make stable cleaning processing difficult.
- a surfactant may be added to the cleaning liquid of the present invention. This reduces the surface tension of the cleaning liquid and improves the wettability with respect to the surface of the object to be cleaned. As a result, it is possible to uniformly exhibit the cleaning and removing effect in a wider range with respect to the object to be cleaned, and the productivity can be improved.
- anionic surfactants such as aliphatic carboxylic acid and its salt, etc. are mentioned.
- nonionic surfactants such as polyethyleneglycol alkyl ether
- cationic surfactants such as an aliphatic amine or its salt.
- the addition amount of the surfactant is preferably in the range of 0.001 to 0.1% by weight, and more preferably in the range of 0.003 to 0.05% by weight.
- the surfactant By adding the surfactant, it is possible to suppress the surface roughness of the object to be cleaned. Furthermore, the wettability with respect to the object to be cleaned is improved, and the uniformity of the cleaning effect within the surface can be achieved.
- the addition amount is less than 0.001% by weight, the surface tension of the cleaning liquid is not sufficiently lowered, and the effect of improving the wettability may be insufficient.
- the addition amount exceeds 0.1% by weight, not only an effect commensurate with it can be obtained, but also the defoaming property is deteriorated and bubbles adhere to the surface of the object to be cleaned, which may cause uneven cleaning. .
- the pH of the cleaning liquid is preferably 2 or less, and more preferably 1 or less. By setting the pH to 2 or less, the dissolved state of cerium ions can be stabilized, and the cleaning effect can be improved.
- the purity and cleanliness of the cleaning liquid may be set in consideration of the problem of contamination of the object to be cleaned and the manufacturing cost.
- the metal impurity contained in the cleaning liquid is preferably 0.1 ppb or less.
- cleaning liquid which concerns on this invention is not specifically limited, It can produce by a conventionally well-known method.
- the object to be cleaned to which the cleaning liquid of the present invention can be applied is not particularly limited.
- single crystal silicon, polycrystalline silicon, amorphous silicon, thermal silicon oxide film, non-doped silicate glass film, phosphorus-doped silicate glass film, boron-doped silicate Examples thereof include a glass film, a phosphorus boron-doped silicate glass film, a TEOS film, a plasma CVD oxide film, a silicon nitride film, a silicon carbide film, a silicon oxide carbide film, and a silicon oxide carbide nitride film.
- glass, quartz, quartz, ceramics and the like These may be constituted independently or may be a combination of two or more.
- the cleaning liquid of the present invention can also be suitably used for an object to be cleaned that has been flattened by a polishing process.
- the method for polishing the surface of the object to be cleaned is not particularly limited, and various conventionally known methods can be employed.
- the polishing method is appropriately selected depending on the shape of the object to be cleaned and the target polishing accuracy. Specific examples include mechanical polishing and chemical mechanical polishing (CMP).
- the cleaning liquid of the present invention is suitable for chemical mechanical polishing (CMP) using a cerium oxide slurry.
- the cerium oxide slurry is obtained by dispersing cerium oxide as abrasive grains in a solution.
- the cleaning method is not particularly limited as long as the cleaning liquid can be brought into contact with the object to be cleaned. More specifically, for example, there is an immersion treatment method in which an object to be cleaned is immersed in a cleaning liquid filled in a cleaning tank. In addition, there is a single wafer processing method in which a cleaning process is performed by discharging or spraying a cleaning liquid onto an object to be cleaned such as a rotating silicon wafer. Moreover, in the said immersion treatment method, you may employ
- the cleaning time is not particularly limited, and can be appropriately set according to the degree of contamination of cerium oxide adhering to the object to be cleaned. Usually, it is preferably within a range of 10 minutes or less, and preferably 3 minutes or less. If the cleaning time exceeds 10 minutes, the surface of the object to be cleaned may be etched to increase the surface roughness.
- the temperature of the cleaning liquid at the time of cleaning is preferably 30 ° C. or less, more preferably 15 to 25 ° C. When it exceeds 30 ° C., the composition of the cleaning liquid may change due to volatilization of volatile components.
- a PID temperature controller can be used for adjusting the temperature of the cleaning liquid.
- the etch rate of the cleaning liquid is preferably 10 kg / min or less, more preferably 0 to 5 kg / min at a liquid temperature of 25 ° C.
- the etching rate within the above numerical range is more suitable when the object to be cleaned is single crystal silicon, polycrystalline silicon, or thermal silicon oxide film. By setting the etch rate to 10 ⁇ / min or less, it is possible to suppress the etching of the object to be cleaned as well as cleaning and removing cerium oxide.
- a rinsing step with a rinsing agent such as ultrapure water may be performed as necessary after the above-described cleaning treatment. Thereby, it is possible to prevent the cleaning liquid from remaining on the surface of the object to be cleaned.
- the cleaning liquid according to each example or comparative example was prepared by appropriately blending any of the following raw materials. That is, (1) 50% by weight high purity hydrofluoric acid (manufactured by Stella Chemifa Corporation), (2) EL grade, 36% by weight hydrochloric acid (manufactured by Mitsubishi Chemical Corporation), (3) EL grade, 69% by weight nitric acid (Mitsubishi Chemical Corporation), (4) EL grade, 97 wt% sulfuric acid (Mitsubishi Chemical Corporation) (5) EL grade, 86 wt% phosphoric acid (Kishida Chemical Co., Ltd.), (6) Ultrapure water Any of the above was prepared by blending at a predetermined mixing ratio.
- the residue state of the solid cerium oxide on the surface of the object to be cleaned was measured using TREX610-T (manufactured by Technos Co., Ltd.). That is, the measurement was performed before and after the cleaning treatment with the cleaning liquid, and the cleaning effect with the cleaning liquid was confirmed.
- Example 1 In this example, as shown in Table 1, a cleaning solution having a hydrogen fluoride concentration of 0.1% by weight and a hydrochloric acid concentration of 10% by weight was prepared.
- a 200-mm diameter silicon substrate having a TEOS film formed on the surface was subjected to chemical mechanical polishing using cerium oxide as abrasive grains, and this was used as an object to be cleaned.
- cerium oxide as abrasive grains
- this object to be cleaned about 1000 ⁇ 10 9 atoms / cm 2 of cerium oxide was confirmed as a residue component by measuring the residue remaining state described later.
- the cleaning liquid was filled into a 90 L cleaning liquid tank, and the cleaning liquid temperature was adjusted to 25 ° C. to stabilize the cleaning liquid temperature.
- the object to be cleaned was held on a silicon substrate holding member made of PFA resin and immersed in the cleaning liquid tank for 1 minute. After the immersion, the silicon substrate holding member was pulled up from the cleaning liquid tank and immersed in a 90 L ultrapure water rinse tank prepared in advance to wash away the cleaning liquid adhering to the surface of the object to be cleaned. Thereafter, the object to be cleaned was dried, and the residual residue state was measured again.
- Example 2 to 11 each cleaning solution was prepared in the same manner as in Example 1 except that the composition and concentration of the cleaning solution were changed as shown in Table 1. Further, in the same manner as in Example 1, a cleaning process using each cleaning solution was performed. The results are shown in Table 1 below.
- Comparative Examples 1 to 9 each cleaning solution was prepared in the same manner as in Example 1 except that the composition and concentration of the cleaning solution were changed as shown in Table 1. Further, in the same manner as in Example 1, a cleaning process using each cleaning solution was performed. The results are shown in Table 1 below.
- Example 12 In this embodiment, the above-described embodiment was performed except that a silicon substrate having a diameter of 200 mm on which a polysilicon film was formed was used as an object to be cleaned and the composition and concentration of the cleaning liquid were changed as shown in Table 2.
- Each cleaning solution was prepared in the same manner as in Example 1. Further, in the same manner as in Example 1, a cleaning process using each cleaning solution was performed. Good and bad removal performance is good when the amount of particulate solid after treatment is reduced to 8.5 ⁇ 10 9 atoms / cm 2 or less, and not good to 8.5 ⁇ 10 9 atoms / cm 2 Was regarded as defective. The results are shown in Table 2 below.
- Example 13 to 22 each cleaning solution was prepared in the same manner as in Example 12 except that the composition and concentration of the cleaning solution were changed as shown in Table 2. Further, in the same manner as in Example 12, a cleaning process using each cleaning solution was performed. The results are shown in Table 2 below.
- Comparative Examples 10 to 18 each cleaning solution was prepared in the same manner as in Example 12 except that the composition and concentration of the cleaning solution were changed as shown in Table 2. Further, in the same manner as in Example 12, a cleaning process using each cleaning solution was performed. The results are shown in Table 2 below.
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- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
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Abstract
Description
即ち、本発明によれば、従来の酸洗浄液では困難であった酸化セリウムの洗浄除去を効果的に行うことが可能になる。その結果、例えば、半導体装置の製造プロセスに於いて、研磨砥粒として酸化セリウムを用いたCMP工程を採用しても、半導体基板から酸化セリウムの残渣を洗浄除去することが可能になり、半導体装置の生産性を向上させることが可能になる。
本発明に係る洗浄液は、フッ化水素と、塩酸、硝酸、硫酸、酢酸、リン酸、ヨウ素酸及び臭化水素酸からなる群より選択される少なくとも何れか1種の酸と、水とが含み構成される。また、本発明に係る洗浄液に於いては、前記に列挙した酸を主成分として構成されていることが好ましい。ここで、例えば過酸化水素水と前記酸との組み合わせからなる洗浄液であると、この洗浄液は酸化セリウムをセリウムイオンとして溶解させることが困難なため、酸化セリウムを洗浄除去することができない。本発明は、洗浄液中にフッ化水素を含有させることにより、その酸化力により酸化セリウムをセリウムイオンとして溶解させることを可能にしている。また、前記酸単独からなる洗浄液であると、酸化セリウムを溶解させること自体が困難な為、被洗浄物から洗浄除去することが一層困難になる。しかし、これらの酸をフッ化水素と併用することにより、単に洗浄液中にセリウムイオンを溶解させるだけでなく、被洗浄物表面からの除去も可能にする。即ち、本発明の洗浄液は、フッ化水素と前記酸との組み合わせにより、酸化セリウムの洗浄除去を可能にする。尚、セリウムイオンとは、Ce3+、Ce4+、それらの水和物、又はそれらの錯イオンを意味する。
本発明の洗浄液が適用可能な被洗浄物としては特に限定されず、例えば、単結晶シリコン、多結晶シリコン、アモルファスシリコン、熱シリコン酸化膜、ノンドープシリケートガラス膜、リンドープシリケートガラス膜、ボロンドープシリケートガラス膜、リンボロンドープシリケートガラス膜、TEOS膜、プラズマCVD酸化膜、シリコン窒化膜、シリコンカーバイド膜、シリコンオキサイドカーバイド膜、又はシリコンオキサイドカーバイドナイトライド膜等が挙げられる。また、ガラス、石英、水晶、セラミックス等にも適用可能である。これらは単独で構成されるものでもよく、2種以上が組み合わさったものでもよい。
各実施例又は比較例に係る洗浄液は、次に示す原材料の何れかを適宜配合して作製した。即ち、(1)50重量%高純度フッ化水素酸(ステラケミファ株式会社製)、(2)ELグレード、36重量%塩酸(三菱化学株式会社製)、(3)ELグレード、69重量%硝酸(三菱化学株式会社製)、(4)ELグレード、97重量%硫酸(三菱化学株式会社製)(5)ELグレード、86重量%リン酸(キシダ化学株式会社製)、(6)超純水の何れかを所定の混合比率で配合することにより作製した。
被洗浄物の表面における酸化セリウムの固形物の残渣状態については、TREX610-T(株式会社テクノス製)を用いて行った。即ち、洗浄液による洗浄処理の前後で測定を行い、洗浄液による洗浄効果を確認した。
本実施例においては、表1に示す通り、フッ化水素濃度0.1重量%、塩酸濃度10重量%の洗浄液を作製した。
実施例2~12に於いては、表1に示す通りに洗浄液の組成及び濃度を変更したこと以外は、前記実施例1と同様にして各洗浄液を作製した。更に、前記実施例1と同様にして各洗浄液による洗浄処理等を行った。その結果を下記表1に示す。
比較例1~10に於いては、表1に示す通りに洗浄液の組成及び濃度を変更したこと以外は、前記実施例1と同様にして各洗浄液を作製した。更に、前記実施例1と同様にして各洗浄液による洗浄処理等を行った。その結果を下記表1に示す。
本実施例に於いては、被洗浄物としてポリシリコン膜が成膜された直径200mmのシリコン基板を用い、かつ、表2に示す通りに洗浄液の組成及び濃度を変更したこと以外は、前記実施例1と同様にして各洗浄液を作製した。更に、前記実施例1と同様にして各洗浄液による洗浄処理等を行った。除去性能の良、不良は、処理後の粒子状固形物量が8.5×109原子/cm2以下まで低減される場合を良とし、8.5×109原子/cm2まで低減されない場合を不良とした。その結果を下記表2に示す。
実施例13~22に於いては、表2に示す通りに洗浄液の組成及び濃度を変更したこと以外は、前記実施例12と同様にして各洗浄液を作製した。更に、前記実施例12と同様にして各洗浄液による洗浄処理等を行った。その結果を下記表2に示す。
比較例10~18に於いては、表2に示す通りに洗浄液の組成及び濃度を変更したこと以外は、前記実施例12と同様にして各洗浄液を作製した。更に、前記実施例12と同様にして各洗浄液による洗浄処理等を行った。その結果を下記表2に示す。
Claims (10)
- 酸化セリウムを除去する洗浄液であって、フッ化水素と、塩酸、硝酸、硫酸、酢酸、リン酸、ヨウ素酸及び臭化水素酸からなる群より選択される少なくとも何れか1種の酸と、水とが含み構成され、前記酸化セリウムをセリウムイオンとして溶解させて除去することを特徴とする洗浄液。
- 前記フッ化水素の濃度が0.001~20重量%の範囲内であり、前記酸の濃度が0.001~50重量%の範囲内であることを特徴とする請求の範囲第1項に記載の洗浄液。
- 前記洗浄液には界面活性剤が含まれていることを特徴とする請求の範囲第1項に記載の洗浄液。
- 前記界面活性剤の添加量が0.001~0.1重量%であることを特徴とする請求の範囲第1項に記載の洗浄液。
- 前記洗浄液のエッチレートが液温25℃において10Å/min以下であることを特徴とする請求の範囲第1項に記載の洗浄液。
- 前記洗浄液のpHが2以下であることを特徴とする請求の範囲第1項に記載の洗浄液。
- 前記請求の範囲第1項に記載の洗浄液を用いた洗浄法であって、酸化セリウムが付着した被洗浄物に前記洗浄液を接触させることにより、酸化セリウムをセリウムイオンとして溶解させて除去することを特徴とする洗浄方法。
- 前記洗浄液のエッチレートは、その液温が25℃の場合に於ける被洗浄物に対するエッチレートを10Å/min以下にすることを特徴とする請求の範囲第7項に記載の洗浄方法。
- 前記洗浄液の洗浄の際に於ける液温を30℃以下にすることを特徴とする請求の範囲第7項に記載の洗浄方法。
- 前記被洗浄物が、酸化セリウムスラリーにより化学機械研磨されたものであることを特徴とする請求の範囲第7項に記載の洗浄方法。
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PCT/JP2009/059371 WO2010134185A1 (ja) | 2009-05-21 | 2009-05-21 | 洗浄液及び洗浄方法 |
US13/321,450 US20120065116A1 (en) | 2009-05-21 | 2009-05-21 | Cleaning liquid and cleaning method |
KR1020117030384A KR20120027372A (ko) | 2009-05-21 | 2009-05-21 | 세정액 및 세정 방법 |
EP09844918A EP2434004A4 (en) | 2009-05-21 | 2009-05-21 | CLEANING LIQUID AND CLEANING PROCEDURE |
SG2011085909A SG176188A1 (en) | 2009-05-21 | 2009-05-21 | Cleaning liquid and cleaning method |
CN2009801591631A CN102421886A (zh) | 2009-05-21 | 2009-05-21 | 清洗液和清洗方法 |
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EP (1) | EP2434004A4 (ja) |
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Cited By (1)
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JP7173959B2 (ja) * | 2017-03-31 | 2022-11-16 | 関東化学株式会社 | 洗浄液組成物 |
WO2020045414A1 (ja) * | 2018-08-30 | 2020-03-05 | 三菱ケミカル株式会社 | 洗浄液、洗浄方法及び半導体ウェハの製造方法 |
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Also Published As
Publication number | Publication date |
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SG176188A1 (en) | 2011-12-29 |
KR20120027372A (ko) | 2012-03-21 |
EP2434004A1 (en) | 2012-03-28 |
CN102421886A (zh) | 2012-04-18 |
EP2434004A4 (en) | 2012-11-28 |
US20120065116A1 (en) | 2012-03-15 |
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