WO2009128327A1 - 電子材料用洗浄水、電子材料の洗浄方法及びガス溶解水の供給システム - Google Patents
電子材料用洗浄水、電子材料の洗浄方法及びガス溶解水の供給システム Download PDFInfo
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- WO2009128327A1 WO2009128327A1 PCT/JP2009/055902 JP2009055902W WO2009128327A1 WO 2009128327 A1 WO2009128327 A1 WO 2009128327A1 JP 2009055902 W JP2009055902 W JP 2009055902W WO 2009128327 A1 WO2009128327 A1 WO 2009128327A1
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- Prior art keywords
- gas
- dissolved
- water
- cleaning
- oxygen
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- 239000007789 gas Substances 0.000 title claims abstract description 216
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 209
- 238000004140 cleaning Methods 0.000 title claims abstract description 122
- 239000012776 electronic material Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 21
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 172
- 229910052786 argon Inorganic materials 0.000 claims abstract description 86
- 239000001301 oxygen Substances 0.000 claims abstract description 62
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 62
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 41
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 40
- 239000012528 membrane Substances 0.000 claims description 36
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 26
- 238000005406 washing Methods 0.000 claims description 20
- 238000007872 degassing Methods 0.000 claims description 19
- 229910021529 ammonia Inorganic materials 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 230000006837 decompression Effects 0.000 claims description 4
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 28
- 239000000126 substance Substances 0.000 abstract description 17
- 238000011086 high cleaning Methods 0.000 abstract description 2
- 238000003860 storage Methods 0.000 description 13
- 238000004090 dissolution Methods 0.000 description 10
- 239000010419 fine particle Substances 0.000 description 8
- 239000000758 substrate Substances 0.000 description 7
- 229910021642 ultra pure water Inorganic materials 0.000 description 7
- 239000012498 ultrapure water Substances 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000010926 purge Methods 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 229940079593 drug Drugs 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000008346 aqueous phase Substances 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000001471 micro-filtration Methods 0.000 description 2
- 239000011859 microparticle Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 2
- 238000000108 ultra-filtration Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000011538 cleaning material Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- XZPVPNZTYPUODG-UHFFFAOYSA-M sodium;chloride;dihydrate Chemical compound O.O.[Na+].[Cl-] XZPVPNZTYPUODG-UHFFFAOYSA-M 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Images
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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic 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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
-
- 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
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
-
- 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 electronic material cleaning water for wet cleaning electronic materials such as semiconductors and liquid crystal substrates (electronic components, electronic members, etc.), a method for cleaning electronic materials using the electronic material cleaning water, and
- the present invention relates to a method for producing cleaning water for electronic materials.
- the present invention also relates to a gas dissolved water supply system.
- a concentrated chemical solution based on hydrogen peroxide called so-called RCA cleaning method to remove fine particles, organic substances, metals, etc. from the surface of electronic materials such as silicon substrate for semiconductor, glass substrate for liquid crystal, quartz substrate for photomask Wet cleaning was performed at a high temperature.
- the RCA cleaning method is an effective method for removing metal and the like on the surface of electronic materials, but these chemicals are discharged into the waste liquid because a large amount of high-concentration acid, alkali or hydrogen peroxide is used. In addition, a large burden is imposed on neutralization and precipitation in waste liquid treatment, and a large amount of sludge is generated.
- gas-dissolved water prepared by dissolving a specific gas in ultrapure water and adding a trace amount of chemicals as necessary has been used in place of high-concentration chemical solutions. Cleaning with gas-dissolved water can reduce the amount of cleaning water used because there are few problems of chemical residues on the object to be cleaned and the cleaning effect is high.
- specific gases used for gas-dissolved water as electronic material cleaning water include hydrogen gas, oxygen gas, ozone gas, rare gas, and carbon dioxide gas.
- hydrogen gas-dissolved water to which a very small amount of ammonia is added exhibits an extremely high particulate removal effect when used in a cleaning process using ultrasonic waves (for example, Patent Document 1).
- the present invention has been made in view of the above-described conventional situation, and is an electronic material cleaning water that exhibits a much higher cleaning effect than conventional gas-dissolved water, and an electronic device using this electronic material cleaning water. It is an object of the present invention to provide a method for cleaning materials and a method for producing cleaning water for electronic materials.
- Another object of the present invention is to provide a gas dissolved water supply system capable of efficiently producing such gas dissolved water and supplying it to a use point.
- the electronic material cleaning water according to the present invention is an electronic material cleaning water composed of gas-dissolved water containing oxygen and argon as dissolved gases, and has a dissolved oxygen concentration of 8 mg / L or more, and the dissolved oxygen gas amount and dissolved water. 2% by volume or more of dissolved argon gas is included with respect to the total amount of argon gas.
- the cleaning water for electronic materials has a pH of 7 or more.
- This cleaning water for electronic materials may contain ammonia.
- the electronic material cleaning method of the present invention is characterized in that the electronic material is cleaned using the electronic material cleaning water of the present invention.
- the electronic material may be ultrasonically cleaned using this cleaning water.
- the method for producing cleaning water for electronic materials according to the present invention includes an oxygen gas selected from oxygen gas from an oxygen gas cylinder, argon gas from an argon gas cylinder, oxygen gas extracted from the air using a PSA oxygen concentrator, and argon gas.
- Argon gas is dissolved in water to produce the electronic material cleaning water of the present invention.
- water may be degassed to remove dissolved gas, and then the oxygen gas and argon gas below the amount of dissolved gas removed may be dissolved.
- the gas-dissolved water supply system of the present invention includes a degassing device that degasses water to remove dissolved gas, and oxygen gas and argon gas dissolved in degassed water from the degassing device.
- the degassing device may be a decompression membrane degassing device including a gas permeable membrane
- the gas dissolving device may be a gas dissolving device including a gas permeable membrane
- the dissolved oxygen concentration is 8 mg / L or more, and oxygen / argon gas-dissolved water containing 2% by volume or more of dissolved argon gas with respect to the total amount of dissolved oxygen gas and dissolved argon gas has a remarkably excellent cleaning effect.
- the electronic material cleaning water of the present invention comprising such oxygen / argon gas-dissolved water has a small amount of dissolved gas, and a high cleaning effect can be obtained even if the amount of chemical used is small.
- the electronic material can be safely and easily manufactured at low cost, and the electronic material contaminated with fine particles and the like can be safely and easily and inexpensively cleaned with a small amount of cleaning water.
- gas-dissolved water supply system of the present invention such gas-dissolved water having an excellent cleaning effect can be efficiently produced and supplied to the use point.
- the cleaning water for electronic materials has an oxygen concentration of 8 mg / L or more and an oxygen / argon gas containing 2% by volume or more of dissolved argon gas with respect to the total amount of dissolved oxygen gas and dissolved argon gas. Consists of dissolved water.
- the dissolved oxygen concentration in the dissolved gas water is preferably 8 to 50 mg / L, more preferably 10 to 44 mg / L.
- the amount of dissolved argon gas in the gas dissolved water is 2% by volume or more with respect to the total amount of dissolved oxygen gas and dissolved argon gas, so that the effect of improving the cleaning effect by the combined use of argon gas can be reliably obtained. be able to. If this ratio is less than 2% by volume, it is not possible to obtain a sufficient cleaning effect improvement effect. However, even if the amount of dissolved argon gas is too large, the solubility of the gas in water tends to decrease the cleaning effect due to the relative decrease in dissolved oxygen concentration.
- the ratio of the dissolved argon gas to the total amount of the dissolved argon gas is preferably 2 to 50% by volume, particularly 2 to 40% by volume.
- pure water or ultrapure water can be used as water for dissolving oxygen gas and argon gas.
- an alkali agent such as ammonia, sodium hydroxide, potassium hydroxide, tetramethylammonium hydroxide, hydrogen fluoride, hydrogen chloride is further added to the above-mentioned oxygen / argon gas-dissolved water.
- the cleaning functionality can be enhanced by adding one or more agents such as an acid such as sulfuric acid, a chelating agent, and a surfactant.
- an alkaline agent such as ammonia and adjusting the pH of the gas-dissolved water to 7 or more, preferably 9 to 14, the effect of cleaning fine particles can be enhanced.
- the pH adjustment may be performed using an alkaline agent or an alkaline gas.
- ammonia that is easy to handle and allows easy concentration control.
- the use of washing water adjusted to pH 7 to 11 by adding ammonia at 1 mg / L or more, for example, about 1 to 200 mg / L can provide a good washing effect.
- the pH of the washing water is excessively high or the amount of ammonia added is excessively large, there is a possibility that damage to the object to be cleaned may occur, which is not preferable.
- the ammonia may be added after the gas is dissolved or before the gas is dissolved.
- the electronic material cleaning method of the present invention is a method of cleaning an electronic material using the electronic material cleaning water of the present invention described above.
- This cleaning method is not particularly limited, and any conventionally known method such as a method of spraying cleaning water on the object to be cleaned and a method of cleaning by immersing the object to be cleaned in cleaning water should be adopted.
- a method of spraying cleaning water on the object to be cleaned and a method of cleaning by immersing the object to be cleaned in cleaning water should be adopted.
- the frequency of the ultrasonic wave to be used is not particularly limited, but is more preferably 20 KHz to 3 MHz used for general cleaning.
- the temperature of the cleaning water used for cleaning can be in the range of 10 to 90 ° C. According to the cleaning water for electronic materials of the present invention, an excellent cleaning effect can be obtained even at room temperature. Since it can obtain, it is preferable that the washing water temperature shall be normal temperature.
- the use of a sealed cleaning tank and piping prevents contamination of the cleaning water and maintains the quality of the cleaning water for a long period of time.
- the cleaning water is produced by concentrating and manufacturing the cleaning water in one place without providing the cleaning water manufacturing apparatus individually for many cleaning machines.
- wash water once used for washing is collected, impurities are removed so that there is no problem in the next washing, degassing is performed again, and necessary oxygen gas and argon gas are dissolved and reused for washing. It is also possible to build a recovery circulation system.
- oxygen gas and argon gas may be dissolved at a predetermined concentration in pure water or ultrapure water manufactured at room temperature.
- oxygen gas and argon gas may be dissolved in pure water or ultrapure water as a mixed gas mixed in advance at a predetermined ratio.
- the oxygen gas and argon gas used in the gas-dissolved water may be supplied from an oxygen gas cylinder and an argon gas cylinder, respectively, and in the atmosphere by a PSA (Pressure Swing Adsorption) oxygen concentrator.
- Oxygen gas and argon gas may be taken out from the air and used. That is, when oxygen gas is generated from air (oxygen concentration of about 20% by volume, argon concentration of about 1% by volume) by the PSA oxygen concentrator, argon gas is also generated, so that an oxygen / argon mixed gas is obtained. Can do.
- a method in which an oxygen / argon mixed gas having a predetermined argon gas concentration is produced in advance using a PSA oxygen concentrator and this mixed gas is dissolved in pure water or ultrapure water is inexpensive, and the gas cylinder is replaced. It is advantageous without trouble.
- oxygen gas and argon gas pure gas or ultrapure water is previously deaerated to remove dissolved gas, and oxygen gas and argon gas below the amount of dissolved gas removed are dissolved.
- the gas can be dissolved smoothly, which is preferable.
- a gas permeable membrane module in which the gas phase and the aqueous phase are partitioned through the gas permeable membrane is used, and the dissolved gas in the aqueous phase is related to its components by depressurizing the gas phase.
- a decompression membrane deaeration device that moves to the gas phase through the gas permeable membrane, and the oxygen gas supplied to the gas phase using the gas permeable membrane module for the subsequent dissolution of oxygen gas and argon gas.
- an apparatus that dissolves argon gas by transferring it to an aqueous phase through a gas permeable membrane.
- the gas-dissolved water supply system of the present invention is useful as a gas-dissolved water supply system as the electronic material cleaning water of the present invention, and is a degassing device that removes dissolved gas by degassing water. And oxygen gas and argon gas are dissolved in the degassed treated water from the degassing device, the dissolved oxygen concentration is 8 mg / L or more, and 2 for the total of the dissolved oxygen gas amount and the dissolved argon gas amount. It is characterized by having a gas dissolving device for preparing gas-dissolved water containing dissolved argon gas of volume% or more and a supply means for supplying the gas-dissolved water from the gas dissolving device to a use point.
- This gas-dissolved water supply system preferably further comprises the following. i) Wastewater return means for returning at least a part of the cleaning wastewater used at the point of use for use as cleaning water ii) An unused gas-dissolved water return means for returning at least a part of the unused gas-dissolved water from the use point for use as cleaning water iii) A water tank for storing cleaning water to be supplied to the gas dissolving device, and a means for introducing water from the return means into the water tank iv) Pump for supplying water from the water tank to the gas dissolving device v) Means for purifying water from the pump with a purifier and supplying it to the gas dissolving device vi) Means for adding a drug to at least one of circulating water and replenished water vii) A measuring unit that measures the concentration of the drug in the water or the equivalent thereof so that the concentration of the drug in the water to which the drug is added is kept constant.
- the degassing device is preferably a decompression membrane degassing device using a gas permeable membrane.
- a gas dissolving device using a gas permeable membrane specifically, a gas permeable membrane is used.
- a gas-dissolving membrane module in which an air chamber and a water chamber are separated, and in order to discharge condensed water accumulated in the air chamber of the gas-dissolving membrane module, an amount larger than the amount of gas dissolved by the water flow rate at that time
- a gas dissolving device that dissolves gas while supplying gas to the gas-dissolving membrane module and discharging an excess of the supplied gas that has not been dissolved out of the gas-dissolving membrane module is preferable.
- FIGS. 1 and 2 are system diagrams each showing a gas-dissolved water supply system according to an embodiment of the present invention.
- drainage after washing the object to be washed with water in which gas (oxygen / argon mixed gas) is dissolved is stored in a storage tank 1 via a pipe 15.
- the makeup water is supplied via the makeup water pipe 1a.
- pure water or ultrapure water having a cleanliness level that can be used for cleaning, or gas (oxygen / argon mixed gas) dissolved water produced by another apparatus is desirable.
- purge gas is supplied from the purge gas pipe 1b, and the storage tank 1 is adjusted to a pressure slightly higher than the atmospheric pressure by, for example, about 10 to 50 mmAq, preferably about 30 mmAq by the pressure adjustment mechanism 1c.
- the inside may be adjusted so that outside air is not mixed.
- the purge gas is not necessarily required when the required cleanliness of the object to be cleaned is not high. In consideration of safety, it is preferable to use the same gas (oxygen / argon mixed gas) as the purge gas as the purge gas because the gas can be prevented from diffusing from the water in the storage tank 1.
- the storage tank 1 can also serve as a cleaning tank 14 described later.
- the makeup water pipe 1 a is connected to the cleaning treatment tank 14.
- the water in the storage tank 1 is sent to the purification device 4 via the pressure feed pump 2 and the heat exchanger 3 for keeping the water temperature constant.
- the purifier 4 foreign substances that are present in the water and that substantially affect the cleaning are removed together with a part of the water.
- the heat exchanger 3 is mainly used for cooling the part which heated up during circulation, you may use the heated water for washing
- the installation place of the heat exchanger 3 is desirably upstream of the purification device 4.
- an ultrafiltration (UF) membrane, a microfiltration (MF) membrane device or the like is used, and foreign matter is discharged out of the system together with brine water.
- Supplied water may be supplied anywhere from the storage tank 1 to the secondary side of the purifier 4. From the viewpoint of efficiently removing foreign substances by reducing the amount of treated water in the purifier 4, the secondary side of the purifier 4 is preferable, but since complicated control is involved in the operation of the apparatus, it is easy to control the makeup water. It is preferable to replenish the storage tank 1. For example, if the amount of makeup water is adjusted so that the water level in the storage tank 1 is kept constant, it can be balanced with the amount of water discharged to the outside of the system, and the control becomes easy.
- the water from which the foreign matter has been removed by the purification device 4 is sent to the deaeration device 6 through the flow meter 5.
- a membrane deaeration device including a deaeration membrane 6a, in which an air chamber and a water chamber are separated by the deaeration membrane 6a, is suitable.
- the vacuum pump 6b By sucking the air chamber with the vacuum pump 6b, the dissolved gas in the water is degassed.
- the vacuum pump 6b There is no restriction on the vacuum pump 6b, and a water seal type or a scroll type is used.
- those using oil for generating a vacuum may cause oil to reversely diffuse and contaminate the degassing membrane, so that it is oilless. Is desirable.
- Degassed treated water from the degassing device 6 is sent to the gas dissolving device 7.
- a gas dissolving membrane module in which an air chamber and a water chamber are separated by a gas permeable membrane 7a is suitable.
- an oxygen / argon mixed gas is introduced from the PSA oxygen concentrating device 8 into the gas chamber of the gas dissolving device 7 through the regulating valve 8a and the flow meter 8b.
- the oxygen / argon mixed gas passes through the membrane 7a and dissolves in the water in the water chamber. Excess oxygen / argon mixed gas is discharged out of the system from an exhaust gas line 9 having a gas discharge valve 9a.
- the gas supply amount is preferably about 1.1 to 1.5 times, preferably about 1.2 to 1.4 times when this amount of water and the amount of saturated gas at the water temperature is 1. And preferable from the discharge. It is desirable to adjust the dissolved gas concentration by changing the concentration of the supply gas.
- the gas discharge valve 9a may be closed and dissolved, and in this case, an amount of oxygen / argon mixed gas corresponding to the amount of water measured by the flow meter 5 and the required concentration is supplied from the PSA oxygen concentrator 8. Supplied.
- the oxygen / argon mixed gas flow rate is measured by the gas flow meter 8b, and the gas flow rate is adjusted by the adjusting valve 8a so that the indicated value of the flow meter 8b becomes a desired value.
- a mass flow controller in which a flow meter and a regulating valve are integrated may be used. Further, the adjustment of the oxygen / argon mixed gas amount may be adjusted so as to be a desired instruction value in conjunction with the instruction value of the dissolved gas concentration meter 12.
- the gas dissolved water from the gas dissolving device 7 is then confirmed to have a pH within a predetermined range by the pH meter 11, and further, the dissolved gas concentration meter 12 is confirmed to have a dissolved oxygen concentration at a desired concentration. Then, it is supplied to the cleaning tank 14 through the supply pipe 13.
- chemicals such as alkaline chemicals can be added to the gas-dissolved water by the adding means 10.
- the additive concentration of the chemical is measured by a concentration meter, a pH meter, an ORP meter, a conductivity meter, etc. for each chemical, and the supply amount is adjusted so as to obtain a desired concentration.
- the adjustment method can be adjusted by the number of pulses and the stroke length when injecting with a pump, and when injecting with gas, the injection amount can be adjusted by adjusting the gas pressure. In either method, the injection amount can be adjusted by the opening of the valve.
- the injection location is not limited to this, but in order to improve the controllability of the injection (fast response), it is desirable to be immediately before or slightly upstream from the concentration meter (pH meter in FIG. 1). Chemicals such as alkaline agents may be added to the makeup water.
- the washing waste water from the washing treatment tank 14 is returned to the storage tank 1 through the return pipe 15.
- FIG. 1 the entire amount of gas dissolved water from the gas dissolving device 7 is supplied to the cleaning treatment tank 14 by the supply pipe 13, but in FIG. 2, the end of the supply pipe 13 is connected to the storage tank 1 and supplied.
- a branch supply pipe 15 is branched from the middle of the pipe 13, and gas-dissolved water is supplied from the branch supply pipe 15 to each cleaning treatment tank 14.
- the cleaning wastewater from each cleaning treatment tank 14 is returned to the storage tank 1 via the pipe 16. Excess gas-dissolved water that has not been used for cleaning is also returned to the storage tank 1, and this unused water is also reused as raw water for gas-dissolved water.
- gas-dissolved water as electronic material cleaning water is degassed that has been removed with a vacuum membrane degassing apparatus equipped with a gas-permeable membrane so that the dissolved gas in pure water is 10% or less of the saturation.
- the required amount of oxygen gas produced from air in the atmosphere using a PSA oxygen concentrator or an oxygen / argon mixed gas containing argon gas in treated water was prepared by dissolving with a gas permeable membrane module for gas dissolution. A thing was used.
- the temperature of the washing water is room temperature (23 ° C.).
- a substrate obtained by drying a silicon wafer substrate contaminated with a cerium oxide abrasive was used as the object to be cleaned.
- a batch type cleaning machine with ultrasonic waves (ultrasonic wave: frequency 750 KHz) was used as the cleaning machine. The washing time was 3 minutes.
- the cleaning effect was evaluated by measuring the number of fine particles having a particle size of 0.12 ⁇ m or more on the substrate before and after the cleaning using a “WM-1500” defect inspection apparatus manufactured by Topcon and calculating the removal rate.
- Example 1 Using oxygen gas produced by the PSA oxygen concentrator or an oxygen / argon mixed gas, the degree of saturation of the total dissolved gas amount is constant at 38% (the dissolved oxygen concentration is 16 mg / L). Gas-dissolved water was prepared by dissolving, and the cleaning effect of each gas-dissolved water was examined.
- FIG. 3 shows the relationship between the oxygen / argon mixing ratio of the gas dissolved in the degassed water (represented by the volume percentage of each gas with the total gas mixture being 100% by volume) and the fine particle removal rate by cleaning. It was.
- pH of all gas dissolved water was 7.
- Example 1 An oxygen / argon mixed gas containing 2% by volume of argon gas (argon gas concentration in the mixed gas was 2% by volume) was obtained by a PSA oxygen concentrator, and this oxygen / argon mixed gas was treated with degassed treated water. Gas dissolved water (pH 7) dissolved to have various dissolved oxygen concentrations.
- Example 2 A solution obtained by adding 1 mg / L of ammonia to the gas-dissolved water having various dissolved oxygen concentrations in Example 1 (pH 9.4).
- Comparative Example 1 Gas-dissolved water (pH 7) obtained by dissolving oxygen gas containing no argon gas in degassed treated water so as to have various dissolved oxygen concentrations.
- oxygen / argon gas-dissolved water containing dissolved argon gas is more effective than oxygen-gas-dissolved water containing no dissolved argon gas. Further, it can be seen that a further excellent cleaning effect can be obtained by further adding ammonia to oxygen / argon gas-dissolved water to make the pH weakly alkaline.
- the cleaning effect is improved when the dissolved oxygen concentration is 8 mg / L or more, and the dissolved oxygen concentration is preferably 8 mg / L or more.
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Abstract
Description
本発明の電子材料用洗浄水は、溶存酸素濃度が8mg/L以上であり、溶存酸素ガス量と溶存アルゴンガス量との合計に対して2体積%以上の溶存アルゴンガスを含む酸素/アルゴンガス溶解水よりなる。
本発明の電子材料の洗浄方法は、上述の本発明の電子材料用洗浄水を用いて電子材料を洗浄する方法である。
上述の本発明の電子材料用洗浄水を製造するには、常温に従って製造された純水又は超純水に、酸素ガスとアルゴンガスとを所定の濃度で溶解させれば良い。この場合、酸素ガスとアルゴンガスの溶解の順序には特に制限はなく、いずれか一方を先に溶解させて他方を後に溶解させても良く、また、両ガスを同時に溶解させても良い。また、酸素ガスとアルゴンガスとは予め所定の割合で混合した混合ガスとして純水又は超純水に溶解させても良い。
本発明のガス溶解水の供給システムは、本発明の電子材料用洗浄水としてのガス溶解水の供給システムとして有用なものであって、水を脱気処理して溶存ガスを除去する脱気装置と、該脱気装置からの脱気処理水に酸素ガス及びアルゴンガスを溶解させて、溶存酸素濃度が8mg/L以上であり、溶存酸素ガス量と溶存アルゴンガス量との合計に対して2体積%以上の溶存アルゴンガスを含むガス溶解水を調製するガス溶解装置と、該ガス溶解装置からのガス溶解水をユースポイントに供給する供給手段とを有することを特徴とする。
i) ユースポイントで使用された洗浄排水の少なくとも一部を洗浄用水に利用するために返送する排水返送手段
ii) ユースポイントから未使用のガス溶解水の少なくとも一部を洗浄用水に利用するために返送する未使用ガス溶解水返送手段
iii) ガス溶解装置に供給する洗浄用水を貯留するための水槽と、返送手段からの水を該水槽に導入する手段
iv) 該水槽からの水をガス溶解装置に供給するためのポンプ
v) 該ポンプからの水を純化装置で純化してからガス溶解装置に供給する手段
vi) 循環する水及び補給する水の少なくとも一方に、薬剤を添加する手段
vii) 薬剤が添加された水中の薬剤の濃度を一定に保つように、該水中の薬剤濃度又はそれに準じるものを計測する計測部
図1,2は、それぞれ本発明の実施の形態に係るガス溶解水の供給システムを示す系統図である。
PSA酸素濃縮装置で製造した酸素ガス、或いは酸素/アルゴン混合ガスを用い、全溶存ガス量の飽和度が38%(溶存酸素濃度として16mg/L)で一定となるようにして脱気処理水に溶解させてガス溶解水を調製し、各々のガス溶解水の洗浄効果を調べた。
脱気処理水に溶解させたガスの酸素/アルゴン混合比(混合ガスの全体を100体積%として各々のガスの体積百分率で示す。)と洗浄による微粒子の除去率との関係を図3に示した。なお、いずれのガス溶解水も、pHは7であった。
ガス溶解水として、以下に示すものを用いたこと以外は実験例1と同様にしてそれぞれ洗浄効果を調べ、結果を図4に示した。
なお、本出願は、2008年4月16日付で出願された日本特許出願(特願2008-106926)に基づいており、その全体が引用により援用される。
Claims (9)
- 溶存ガスとして酸素とアルゴンとを含むガス溶解水よりなる電子材料用洗浄水であって、
溶存酸素濃度が8mg/L以上であり、
溶存酸素ガス量と溶存アルゴンガス量との合計に対して2体積%以上の溶存アルゴンガスを含むことを特徴とする電子材料用洗浄水。 - 請求項1において、pHが7以上であることを特徴とする電子材料用洗浄水。
- 請求項2において、アンモニアを含むことを特徴とする電子材料用洗浄水。
- 請求項1ないし3のいずれか1項に記載の電子材料用洗浄水を用いて電子材料を洗浄することを特徴とする電子材料の洗浄方法。
- 請求項4において、前記電子材料用洗浄水を用いて超音波洗浄を行うことを特徴とする電子材料の洗浄方法。
- 酸素ガスボンベからの酸素ガス、アルゴンガスボンベからのアルゴンガス、並びにPSA酸素濃縮装置を用いて空気から取り出した酸素ガス及びアルゴンガスより選ばれる酸素ガスとアルゴンガスとを水に溶解させて請求項1ないし3のいずれか1項に記載の電子材料用洗浄水を製造することを特徴とする電子材料用洗浄水の製造方法。
- 請求項6において、水を脱気処理して溶存ガスを除去し、その後、除去した溶存ガス量以下の前記酸素ガスとアルゴンガスとを溶解させることを特徴とする電子材料用洗浄水の製造方法。
- 水を脱気処理して溶存ガスを除去する脱気装置と、
該脱気装置からの脱気処理水に酸素ガス及びアルゴンガスを溶解させて、溶存酸素濃度が8mg/L以上であり、溶存酸素ガス量と溶存アルゴンガス量との合計に対して2体積%以上の溶存アルゴンガスを含むガス溶解水を調製するガス溶解装置と、
該ガス溶解装置からのガス溶解水をユースポイントに供給する供給手段とを有することを特徴とするガス溶解水の供給システム。 - 請求項8において、前記脱気装置が、気体透過膜を備える減圧膜脱気装置であり、前記ガス溶解装置が気体透過膜を備えるガス溶解装置であることを特徴とするガス溶解水の供給システム。
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