WO2006030816A1 - 硫酸リサイクル型洗浄システムおよび硫酸リサイクル型過硫酸供給装置 - Google Patents
硫酸リサイクル型洗浄システムおよび硫酸リサイクル型過硫酸供給装置Info
- Publication number
- WO2006030816A1 WO2006030816A1 PCT/JP2005/016916 JP2005016916W WO2006030816A1 WO 2006030816 A1 WO2006030816 A1 WO 2006030816A1 JP 2005016916 W JP2005016916 W JP 2005016916W WO 2006030816 A1 WO2006030816 A1 WO 2006030816A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sulfuric acid
- solution
- cleaning
- electrolytic reaction
- cleaning system
- Prior art date
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/28—Per-compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/14—Removing waste, e.g. labels, from cleaning liquid; Regenerating cleaning liquids
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- 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
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
- H01L21/6704—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing
- H01L21/67057—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing with the semiconductor substrates being dipped in baths or vessels
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/346—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from semiconductor processing, e.g. waste water from polishing of wafers
Definitions
- the present invention relates to a sulfuric acid that is used for cleaning by regenerating a persulfuric acid solution while repeatedly using a sulfuric acid solution when cleaning and peeling a contaminant attached to a silicon wafer or the like with a persulfuric acid solution having a high peeling effect.
- the present invention relates to a recycling-type cleaning system and a sulfuric acid recycling-type persulfuric acid supply device for supplying persulfuric acid to the cleaning device.
- Wafer cleaning technology in the VLSI manufacturing process is a process for stripping and cleaning resist residues, fine particles, metals and natural oxide films, etc., and is a mixed solution of concentrated sulfuric acid and hydrogen peroxide (SP M) or concentrated sulfuric acid.
- SP M hydrogen peroxide
- a solution (SOM) in which ozone gas is blown into is often used.
- hydrogen peroxide or ozone is added to high-concentration sulfuric acid, the sulfuric acid is oxidized and persulfuric acid is produced. It is known that persulfuric acid is useful for cleaning the above-mentioned wafers and the like having high cleaning ability because they generate strong acid scents when self-decomposing.
- Patent Document 1 As a method for producing persulfuric acid, in addition to the above method, there is also known a method in which an aqueous solution containing sulfate ions is electrolyzed in an electrolytic tank to obtain a persulfuric acid-dissolved water and used for washing (Patent Document 1, 2).
- Patent Document 1 Japanese Patent Laid-Open No. 2001-192874
- Patent Document 2 Japanese Translation of Special Publication 2003-511555
- the present invention has been made against the background of the above circumstances, and by reusing persulfate ions by regenerating sulfuric acid ions by electrochemical action while repeatedly using sulfuric acid, the persulfate ions are recycled.
- the objective is to provide a sulfuric acid recycling type cleaning system and a sulfuric acid recycling type persulfuric acid supply device that can greatly reduce the amount used.
- the first invention is a cleaning apparatus for cleaning a material to be cleaned using a persulfuric acid solution as a cleaning liquid, and an excess of sulfate ions contained in the solution by an electrolytic reaction. It is characterized by comprising an electrolytic reaction device for regenerating the persulfate solution by generating sulfate ions, and a circulation line for circulating the persulfate solution between the cleaning device and the electrolytic reaction device.
- the sulfuric acid recycle type cleaning system of the second invention is the sulfuric acid recycle type cleaning system of the present invention, wherein the temperature of the solution electrolyzed in the electrolytic reaction device is kept lower than the temperature of the cleaning solution.
- the sulfuric acid recycling type cleaning system of the third invention is the sulfuric acid recycling type cleaning system of the present invention.
- the temperature of the solution to be electrolyzed by the electrolytic reaction device is set within a range of 10 ° C to 90 ° C.
- a sulfuric acid recycling type cleaning system is characterized in that the sulfuric acid recycling type cleaning system of the present invention includes a heating means for heating the cleaning liquid.
- a sulfuric acid recycle type cleaning system is characterized in that the sulfuric acid recycle type cleaning system of the present invention comprises cooling means for cooling the solution electrolyzed in the electrolytic reaction device. To do.
- the sulfuric acid recycling type cleaning system of the sixth invention is a sulfuric acid recycling type cleaning system of the present invention.
- a cooling means for cooling the solution to be electrolyzed in the electrolytic reaction apparatus is provided on the stem.
- a sulfuric acid recycling type cleaning system is the sulfuric acid recycling type cleaning system according to the present invention, wherein a relatively low temperature persulfuric acid solution is fed from the electrolytic reactor in the circulation line. It has a heat exchange means for exchanging heat between the liquid and the return liquid of the relatively high temperature persulfuric acid solution from the cleaning device.
- the sulfuric acid recycling type cleaning system of the eighth invention is characterized in that, in the sulfuric acid recycling type cleaning system of the present invention, the flow path in the circulation line is made of quartz or tetrafluoroethylene. To do.
- a sulfuric acid recycling type cleaning system is characterized in that, in the sulfuric acid recycling type cleaning system of the present invention, the sulfuric acid recycling type cleaning system has a decomposition part that decomposes the removed material removed from the cleaning material by the cleaning. .
- the sulfuric acid recycling type cleaning system of the tenth invention is characterized in that, in the sulfuric acid recycling type cleaning system of the present invention, the solution electrolyzed by the electrolysis device has a sulfuric acid concentration of 8M to 18M. .
- the sulfuric acid recycling type cleaning system according to the eleventh aspect of the invention is characterized in that, in the sulfuric acid recycling type cleaning system of the present invention, at least an anode of the electrodes provided in the electrolytic reaction device is a conductive diamond electrode. .
- the sulfuric acid recycling type cleaning system according to the twelfth aspect of the present invention is the sulfuric acid recycling type cleaning system according to the present invention, wherein the conductive diamond electrode provided in the electrolytic reaction device is laminated on the substrate and then removed from the substrate. It is a conductive diamond electrode
- a sulfuric acid recycling type cleaning system is characterized in that in the sulfuric acid recycling type cleaning system of the present invention, the material to be cleaned is a semiconductor substrate.
- the sulfuric acid recycle type cleaning system of the fourteenth aspect of the invention is the sulfuric acid recycle type cleaning system of the present invention, wherein the total organic carbon concentration (TOC) generation rate of organic contaminants by the cleaning in the cleaning device, Ratio of persulfuric acid production rate in electrolyzer (persulfuric acid production rate [gZlZhr] / (TOC generation rate in washing tank [gZlZhr])) force 10 to 500 Electrolytically controlled.
- TOC total organic carbon concentration
- the sulfuric acid recycling type cleaning system of the fifteenth aspect of the invention is a sulfuric acid recycling type cleaning system of the present invention.
- the supersulfuric acid solution has an ultrapure water or hydrogen peroxide solution supply line for supplying ultrapure water or hydrogen peroxide solution to the persulfuric acid solution.
- a sulfuric acid recycling type cleaning system is the sulfuric acid recycling type cleaning system according to the present invention, wherein the ultrapure water or peroxyhydrogen water replenishment line is over the bottom of the cleaning tank of the cleaning device. It is provided to inject pure water or hydrogen peroxide water.
- a sulfuric acid recycling type cleaning system is the sulfuric acid recycling type cleaning system of the present invention, comprising sulfuric acid concentration measuring means for measuring the sulfuric acid concentration of the solution, and the concentration measured by the sulfuric acid concentration measuring means.
- the injection operation of the ultrapure water or hydrogen peroxide supply line is controlled based on the above.
- the sulfuric acid recycling type cleaning system according to the eighteenth aspect of the present invention is the sulfuric acid recycling type cleaning system according to the present invention, wherein the concentration measured by the sulfuric acid concentration measuring means is 0.2 M or more higher than a predetermined set concentration.
- the ultrapure water or the peroxyhydrogen water is injected through the ultrapure water or peroxyhydrogen water supply line.
- the sulfuric acid recycle type cleaning system of the nineteenth invention is characterized in that the sulfuric acid concentration measuring means measures the sulfuric acid concentration by an absorbance method.
- a sulfuric acid recycling type cleaning system has a liquid amount measuring means for measuring the amount of cleaning liquid in the cleaning tank of the cleaning device, in addition to the sulfuric acid recycling type cleaning system of the present invention.
- the injection operation of the ultrapure water or hydrogen peroxide water replenishment line is controlled based on the measurement result by the liquid amount measuring means.
- the sulfuric acid recycling type cleaning system of the twenty-first invention is a sulfuric acid recycling type cleaning system of the present invention.
- the liquid level height measuring means for measuring the liquid level height of the cleaning liquid in the cleaning tank of the cleaning apparatus is provided, and the ultrapure water or the peroxy acid based on the measurement result by the liquid level height measuring means. It is characterized by controlling the injection operation of the hydrogen water supply line.
- a sulfuric acid recycling type cleaning system is the sulfuric acid recycling type cleaning system according to the present invention, wherein the mass of the liquid for measuring the mass of the cleaning liquid in the cleaning tank of the cleaning device is measured. It has a measuring means, and controls the injection operation of the ultrapure water or peroxyhydrogen water replenishment line based on the measurement result by the liquid mass measuring means.
- a sulfuric acid recycling type cleaning system is characterized in that, in the sulfuric acid recycling type cleaning system of the present invention, the liquid mass measuring means measures the mass of the cleaning liquid together with the cleaning tank. .
- the sulfuric acid recycle-type persulfuric acid supply device includes an electrolytic reaction device that regenerates a persulfuric acid solution by generating persulfate ions from sulfate ions contained in the solution by an electrolytic reaction, A circulation line for circulating the solution is provided between the electrolytic reaction device and the cleaning device using persulfuric acid.
- the sulfuric acid recycling type persulfuric acid supply device of the twenty-fifth aspect of the present invention is the sulfuric acid recycling type persulfuric acid supply device of the present invention, wherein the return liquid from the cleaning device to the electrolytic reaction device in the circulation line is 10 to 90 ° C.
- a cooling means for cooling to the range is provided.
- a sulfuric acid recycling type persulfuric acid supply device is the sulfuric acid recycling type persulfuric acid supply device according to the present invention, wherein the feed liquid from the electrolytic reaction device to the cleaning device in the circulation line is 100 to 170 ° C. Heating means for heating to a range is provided.
- the sulfuric acid recycling type persulfuric acid supply device is the sulfuric acid recycling type persulfuric acid supply device according to the present invention, wherein the feed solution from the electrolytic reaction device to the cleaning device in the circulation line and the electrolytic reaction device from the cleaning device It is characterized by comprising heat exchange means for exchanging heat with the return liquid.
- the sulfuric acid recycling type persulfuric acid supply device is characterized in that, compared with the sulfuric acid recycling type persulfuric acid supply device of the present invention, the concentration of sulfate ions contained in the solution is 8M or more. .
- a sulfuric acid recycling type persulfuric acid supply device is the sulfuric acid recycling type persulfuric acid supply device according to the present invention, wherein a conductive diamond electrode is used at least as an anode among electrodes provided in the electrolytic reaction device. It is characterized by.
- the sulfuric acid recycling type persulfuric acid supply device of the thirtieth invention is characterized in that, in the sulfuric acid recycling type persulfuric acid supply device of the present invention, the flow path in the circulation line is made of tetrafluoroethylene. . That is, according to the present invention, persulfate ions in the cleaning liquid self-decompose to generate an oxidizing power, and contaminants and the like of the material to be cleaned are effectively peeled and cleaned by this oxidizing power. In the washing solution, the concentration of persulfate gradually decreases due to self-decomposition of persulfate ions in the solution. This persulfuric acid solution is sent to the electrolytic reactor through a circulation line.
- an anode and a cathode are immersed in a solution containing sulfate ions, and an electric current is passed between the electrodes to perform electrolysis, whereby sulfate ions are oxidized to produce persulfate ions, and a persulfate concentration is sufficiently high.
- Regenerated to sulfuric acid solution The regenerated persulfuric acid solution is sent to a cleaning device through a circulation line, and the material to be cleaned is effectively peeled and washed with a high concentration of persulfuric acid in the same manner as described above.
- By repeatedly circulating persulfuric acid between the cleaning device and the electrolytic reaction device effective cleaning can be continued while maintaining the persulfuric acid composition. It is also possible to start the circulation of the persulfuric acid solution by preparing sulfuric acid at the start-up and sending it to the washing device as a persulfuric acid solution in the electrolytic reactor.
- persulfuric acid has a higher self-decomposition rate and a higher peeling cleaning action as the temperature is higher. At high temperatures such as 130 ° C, the self-decomposition rate is very fast with a half-life of about 5 minutes.
- the lower the solution temperature the better the efficiency of persulfuric acid generation, and the smaller the electrode wear.
- the cleaning device and the electrolytic reaction device are separated, it is possible to keep the temperature of the solution electrolyzed in the electrolytic reaction device lower than the temperature of the cleaning liquid. Can improve efficiency.
- the cleaning liquid can be heated to an appropriate temperature by an appropriate heating means.
- the heating means include a heater, a heater using heat exchange with hot water, steam, and the like, but the present invention is not limited to a specific one.
- the appropriate temperature of the cleaning liquid can be, for example, 100 ° C to 170 ° C. Below this temperature range, the effect of stripping and cleaning with persulfuric acid decreases. On the other hand, when the temperature exceeds 170 ° C, the persulfuric acid self-decomposition rate becomes extremely high, and the resist cannot be oxidized sufficiently.
- the solution to be electrolyzed in the electrolytic reaction apparatus can be cooled to an appropriate temperature by an appropriate cooling means.
- the cooling means include air coolers and water coolers. Suitable temperatures for the electrolyzed solution can range from 10 to 90 ° C. Above the above temperature range, the electrolysis efficiency decreases and the electrode wear increases. On the other hand, below the above temperature In addition, the heat energy for heating the washing tank to 130 ° C becomes enormous, and the piping path for heat exchange becomes significantly longer, which is not practical. For the same reason, it is more desirable to set the lower limit to 40 ° C and the upper limit to 80 ° C.
- the heating means and the cooling means described above may be attached to a cleaning device or an electrolytic reaction device, or may be provided in a circulation line.
- a separate line may be provided in the cleaning device or electrolytic reaction device to heat or cool the solution.
- the temperature adjustment of the electrolyzed solution and the solution to be cleaned is performed by exchanging heat with each other when the persulfuric acid solution is sent to one device force to the other device with a circulation line.
- the (feed liquid) exchanges heat with each other, the return liquid having a high temperature is deprived of heat due to the heat exchange, and the temperature is lowered, and desirable temperature adjustment is performed as a solution for electrolysis of the electrolytic reaction apparatus.
- the feed liquid having a low temperature is heated by heat exchange, so that the temperature rises and a desirable temperature adjustment is performed as a cleaning liquid.
- the heat exchange can be performed by an appropriate heat exchange means such as heat exchange. Quartz tetrafluoroethylene, which is not easily damaged by persulfuric acid, is desirable for the flow path material in the circulation line including the heat exchange path.
- a means for heating the cleaning liquid and a means for cooling the electrolyzed solution can be provided.
- organic substances such as a resist that have been contained in the persulfuric acid solution by cleaning may be decomposed by a decomposition unit provided outside the circulation line system or the circulation line system.
- the decomposition unit include a thermal decomposition apparatus and an electrolytic reaction apparatus.
- the solution electrolyzed in the electrolytic reaction apparatus contains sulfate ions, and the production efficiency of persulfate ions in the electrolytic reaction apparatus is greatly influenced by the sulfuric acid concentration. Specifically, the persulfuric acid generation efficiency increases as the sulfuric acid concentration decreases. On the other hand, when the sulfuric acid concentration is lowered, the solubility of organic compounds such as resist is lowered, and it becomes difficult to remove the material to be cleaned. From these viewpoints, the sulfuric acid concentration of the solution used in the system is preferably in the range of 8M to 18M, for example. For the same reason, the lower limit is 12M and the upper limit is 17M. desirable.
- the water content in the sulfuric acid solution decreases slightly because it is electrolyzed. Moisture is also reduced by evaporation. For this reason, it is desirable to add ultrapure water or hydrogen peroxide water when the water content is reduced.
- the ultrapure water or the hydrogen peroxide solution can be supplied by providing the persulfuric acid solution with an ultrapure water or hydrogen peroxide water supply line. At this time, if water is poured onto the surface of the sulfuric acid solution, high heat is generated, and a part of the added water evaporates or splashes on the surface, resulting in waste of ultrapure water or hydrogen peroxide water and This is a safety problem. For this reason, it is desirable that the ultrapure water or hydrogen peroxide water supply line is provided so as to inject ultrapure water or hydrogen peroxide water on the bottom side of the cleaning tank of the cleaning device.
- a sulfuric acid concentration measuring means for measuring the sulfuric acid concentration of the solution circulating through the circulation line. Based on the measured concentration by the sulfuric acid concentration measuring means, the ultrapure water or the hydrogen peroxide water replenishment line is provided. It may be possible to perform an injection operation. The measurement results can be displayed on an appropriate display device, etc. so that the operator can check the measurement contents and operate the replenishment of the ultrapure water or hydrogen peroxide water replenishment line. It is also possible to automatically replenish the ultrapure water or peroxyhydrogen water supply line by controlling a control valve provided in the ultrapure water or peroxyhydrogen water supply line.
- the sulfuric acid concentration measuring means is not limited to a specific one as long as it can measure the sulfuric acid concentration, but one using an absorbance method or the like that can immediately measure the sulfuric acid concentration is suitable.
- the sulfuric acid concentration to be maintained in the solution may be set in advance, and the replenishment operation of the ultrapure water or hydrogen peroxide water replenishment line may be controlled by comparing the measured concentration with the set concentration. In that case, when the measured concentration is 0.2 M or more higher than the set concentration, injection of ultrapure water or peroxyhydrogen water using the ultrapure water or hydrogen peroxide water supply line is performed. desirable. This is because the persulfuric acid generation efficiency in the electrolytic reaction tank is significantly reduced when the concentration is higher than 0.2M with respect to an appropriate concentration. The impact on the rate is small.
- the amount of cleaning liquid in the cleaning tank of the cleaning device can be used. It is estimated that the sulfuric acid concentration increases as the amount of cleaning solution decreases.
- the amount of solution in the circulation line and the electrolytic reaction tank is substantially constant during the cleaning and electrolysis operation, and the change in the solution amount appears as a change in the cleaning liquid in the cleaning tank.
- the amount of the cleaning liquid can be known from the level of the cleaning liquid in the cleaning tank and the mass of the cleaning liquid.
- the liquid amount measuring means are measured by the liquid amount measuring means, and based on the measurement result, the injection operation of the ultrapure water or peroxyhydrogen water supply line can be controlled.
- the liquid volume measuring means can be used, for example, when measuring the liquid level, and when measuring the liquid mass, the liquid mass measuring means can be used. it can. It is also possible to know the amount of cleaning liquid by measuring the free space capacity in the cleaning tank.
- the cleaning liquid amount measuring means is not limited to a specific configuration as long as it can measure a measurement target, and various known sensors can be used. In these measurements, the reference liquid level height and liquid mass are set, the set value is compared with the measured value, and ultrapure water or peroxyhydrogen water supply line is used according to the deviation. Replenishment operations (on / off, injection volume adjustment, etc.) can be controlled.
- the electrolytic reaction apparatus electrolysis is performed with the anode and the cathode paired.
- the material of these electrodes is not limited to a specific one in the present invention.
- platinum which is widely used as an electrode
- the diamond electrode can efficiently generate persulfate ions and has little electrode wear. Therefore, it is desirable that at least the anode in which sulfate ions are generated among the electrodes of the electrolytic reaction apparatus is composed of a diamond electrode, and it is desirable that both the anode and the cathode be composed of a diamond electrode.
- the conductive diamond electrode is based on a semiconductor material such as a silicon wafer, and after synthesizing a conductive diamond thin film on the surface of the wafer, the wafer is melted, or a plate-like shape is used under the condition without using the base.
- Self-standing type conductive polycrystalline diamond deposited and synthesized on Can can be mentioned.
- a laminate of Nb, W, Ti, etc. on a metal substrate can be used. When the current density is increased, the problem that the diamond film also peels off the substrate force tends to occur.
- the conductive diamond thin film is obtained by doping a predetermined amount of boron, nitrogen or the like at the time of synthesizing the diamond thin film, and is usually boron-doped. If the doping amount is too small, technical significance does not occur.If the doping amount is too large, the doping effect is saturated.Therefore, a doping amount in the range of 50 to 20,000 ppm is suitable for the carbon content of the diamond thin film! /
- the conductive diamond electrode is usually a plate-like one, but a network structure having a plate-like shape can also be used. That is, in the present invention, the shape and number of electrodes are not particularly limited.
- the electrolytic treatment using the conductive diamond electrode is performed by setting the current density of the conductive diamond electrode surface to 10 to: LOO, OOOAZm 2 and passing a solution containing sulfate ions in a direction parallel to the diamond electrode surface. It is desirable that the liquid line speed is 1 to: LO, OOOmZhr.
- the cleaning device can be either a single wafer type or a notch type
- the cleaning device generates a soluble TOC in the cleaning solution as the resist and other contaminants are peeled and dissolved during cleaning of the electronic board.
- the TOC generation rate (gZlZhr) generated along with the resist stripping and dissolution in the cleaning device is electrolyzed. It is desirable to set the electrolysis conditions so that the persulfuric acid production rate [gZlZhr] in the reactor is 10 to 500 times. This eliminates persulfuric acid. Cost and production are balanced, and efficient cleaning and efficient electrolytic treatment are performed. For the same reason, it is desirable to set the lower limit to 20 and the upper limit to 300.
- a cleaning apparatus for cleaning a material to be cleaned using a persulfuric acid solution as a cleaning liquid, and an excess of sulfate ions contained in the solution by electrolytic reaction.
- An electrolytic reaction device that generates sulfate ions to regenerate the persulfuric acid solution, and a circulation line that circulates the persulfuric acid solution between the cleaning device and the electrolytic reaction device, so that the sulfuric acid solution is repeatedly used.
- a persulfuric acid solution for enhancing the peeling effect can be regenerated on-site by an electrolytic reactor and used for cleaning.
- an electrolytic reaction device that regenerates a persulfuric acid solution by generating persulfate ions from sulfate ions contained in the solution by an electrolytic reaction, and the electrolysis
- a circulation line that circulates the solution is provided between the reaction device and the washing device that uses persulfuric acid, so the persulfate solution can be used by repeatedly using a sulfuric acid solution that does not require the use of external chemicals. It can be regenerated and supplied on-site with an electrolytic reactor.
- FIG. 1 is a schematic view showing one embodiment of a sulfuric acid recycling type cleaning system of the present invention.
- FIG. 2 is a schematic diagram showing a system according to another embodiment.
- FIG. 3 is a schematic view showing an embodiment of a sulfuric acid recycle-type persulfuric acid supply device of the present invention.
- FIG. 4 is a schematic view showing another embodiment of the sulfuric acid recycle type cleaning system of the present invention.
- FIG. 5 is a schematic view showing still another embodiment.
- FIG. 6 is a schematic view showing still another embodiment.
- An electrolytic reaction tank 10 corresponding to the electrolytic reaction apparatus of the present invention is connected to a cleaning tank 1 corresponding to the cleaning apparatus of the present invention by a return pipe 4 and a feed pipe 5.
- the return pipe 4 and the feed pipe 5 each have at least an inner surface made of tetrafluoroethylene, and the return pipe 4 is provided with a liquid feed pump 6 for feeding the persulfuric acid solution 2.
- the return pipe 4, the feed pipe 5 and the liquid feed pump 6 constitute a circulation line of the present invention.
- a heat exchange 7 corresponding to the heat exchange means of the present invention is interposed between the return pipe 4 and the feed pipe 5, and the solution flowing through the return pipe 4 by the heat exchange 7 and the feed pipe 5 are provided. Heat exchange is possible with the solution flowing through.
- the inner surface of the flow path (not shown) in the heat exchanger 7 is tetra. Consists of fluoroethylene.
- the flow path of the return pipe 4, the feed pipe 5, and the heat exchanger 7 is made of tetrafluoroethylene or the like that is resistant to persulfuric acid, so that wear due to persulfuric acid can be avoided.
- the force for performing heat exchange of the solution between the return pipe 4 and the feed pipe 5 As the present invention, the solution is preferably cooled to 10 to 90 ° C. in the return pipe 4. It is also possible to provide a cooling means and a heating means for heating the solution to 100 to 170 ° C. preferably in the feed tube 5.
- an anode 11 and a cathode 12 are arranged, and further, bipolar electrodes 13... 13 are arranged at a predetermined interval between the anode 11 and the negative electrode 12.
- the present invention may be provided with only an anode and a cathode, which are not bipolar, as electrodes.
- a DC power source 14 is connected to the anode 11 and the cathode 12, thereby enabling DC electrolysis in the electrolytic reaction tank 10.
- the electrodes 11, 12, 13 are constituted by diamond electrodes.
- the diamond electrode is manufactured by forming a diamond thin film on a substrate and doping boron in a range of 50 to 20 ppm, preferably in the range of 50 to 20, ppm with respect to the carbon content of the diamond thin film. Further, it may be a self-supporting type by removing the substrate after forming the thin film.
- the cleaning tank 1 is a system separate from the circulation line, and is connected to the thermal decomposition tank 20 corresponding to the decomposition section of the present invention by the thermal decomposition circulation pipes 22 and 24.
- the thermal decomposition circulation pipe 22 is provided with a liquid feed pump 23, and the thermal decomposition circulation pipes 22, 24 and the liquid feed pump 23 pass cleaning liquid between the cleaning tank 1 and the thermal decomposition tank 20. Circulation is possible.
- the thermolysis tank 20 is provided with a heater 21 for heating the liquid in the tank, and the heater 21 also has a function as a heating means of the present invention.
- the washing tank 1 sulfuric acid having a sulfuric acid concentration of 10 to 18 M is accommodated, and ultrapure water is mixed with the sulfuric acid solution in a volume ratio of 5: 1 to obtain a sulfuric acid solution.
- This is sequentially sent to the electrolytic reaction tank 10 by the liquid feed pump 6.
- the electrolytic reaction tank 10 when the anode 11 and the cathode 12 are energized by the DC power source 14, the bipolar electrode 1313 is polarized, and the anode and the cathode appear at predetermined intervals.
- the solution sent to the electrolytic reaction tank 10 is passed between these electrodes.
- the current density at the diamond electrode surface. 10 to: LOO, 0 to energization control so that OOAZm 2 was desired.
- the solution When the solution is energized in the electrolytic reaction tank 10, the sulfate ions in the solution undergo an oxidation reaction to generate persulfate ions, and the persulfate solution 2 is regenerated.
- This persulfuric acid solution 2 is fed from the feed pipe 5 to the washing tank 1, and a high-concentration persulfuric acid solution 2 is obtained in the washing tank 1.
- the persulfate ion concentration gradually decreases due to self-decomposition, but the solution circulates between the electrolytic reaction tank 10 and is electrolyzed in the electrolytic reaction tank 10 to generate persulfate ions. The persulfate ion concentration is maintained.
- the power for explaining the process of producing sulfuric acid persulfuric acid at the time of start-up As the present invention, initial power persulfuric acid may be prepared. However, in terms of producing persulfuric acid on-site, it is advantageous to produce persulfuric acid using an electrolytic reactor.
- the persulfuric acid solution 2 in the cleaning tank 1 is circulated between the thermal decomposition tanks 22 by the thermal decomposition circulation pipes 22 and 24 and the liquid feed pump 23, By heating the solution in the pyrolysis tank 20, the temperature of the persulfuric acid solution 2 in the washing tank 1 can be raised. Circulation using the thermal decomposition circulation pipes 22 and 24 and the feed pump 23 may be performed after the persulfuric acid concentration in the washing tank 1 has become sufficiently high.
- the temperature of the persulfuric acid solution 2 serving as the cleaning liquid is increased by the above temperature increase, and the cleaning of the semiconductor wafer 30 as the material to be cleaned is started in the state where the temperature is about 130 ° C. in the cleaning tank 1.
- the semiconductor wafer 30 is immersed in the cleaning tank 1.
- a high oxidation effect is obtained by the self-decomposition of persulfate ions and the action of sulfuric acid, and the contaminants on the semiconductor wafer 30 are effectively removed and removed.
- the exfoliated product transferred into the persulfate solution 2 is decomposed by the action of persulfate ions.
- the persulfuric acid in the washing tank 1 is sent to the electrolytic reaction tank 10 by the return pipe 4 and the liquid feed pump 6, and as described above, the sulfate ion force Persulfate ions are generated and the persulfate concentration decreased by autolysis. To regenerate Persulfuric Acid Solution 2.
- the persulfuric acid solution 2 moves from the washing tank 1 toward the electrolytic reaction tank 10 through the return pipe 4
- the persulfuric acid solution that is subjected to electrolytic treatment in the electrolytic reaction tank 10 and moves through the feed pipe 5 is used.
- 2 Heat exchange is performed with the heat exchanger 7.
- the persulfuric acid solution 2 fed from the washing tank 1 is heated to about 130 ° C. so as to be suitable for washing.
- the persulfuric acid solution 2 fed from the electrolytic reaction tank 10 has a temperature of about 40 ° C.
- the persulfate solution 2 moving in the return pipe 4 is lowered to a temperature close to 40 ° C, while the persulfate solution 2 moving in the feed pipe 5 is 130 ° Heats to a temperature close to C.
- the persulfuric acid solution 2 that is heat-exchanged by the heat exchanger 7 and moves through the return pipe 4 is then gradually cooled by natural cooling to a temperature of about 40 ° C. suitable for the electrolytic reaction. If it is desired to lower the temperature reliably, a cooling means for forcibly cooling the electrolytic reaction tank 10 by water cooling or air cooling can be provided.
- the persulfuric acid solution 2 that is heat-exchanged in the heat exchanger 7 and moves through the feed pipe 5 is sent to the washing tank 1 and mixed with the persulfuric acid solution 2 remaining in the washing tank 1.
- the temperature of the persulfuric acid solution 2 in the cleaning tank 1 is lowered, the temperature can be raised to an optimum temperature for cleaning by heating with the heater 21.
- the persulfuric acid solution 2 is cooled when being sent from the washing tank 1 to the electrolytic reaction tank 10, electrolyzed, and then heated when being returned from the electrolytic reaction tank 10 to the washing tank 1.
- the persulfuric acid solution 2 in which contaminants are taken in the washing tank 1 is sent to the thermal decomposition tank 20 through a thermal decomposition circulation pipe 24 mm, where a sufficient temperature (for example, By heating to 130 ° C, organic compounds such as resist are decomposed by heating and the cleanness of the persulfuric acid solution 2 is increased.
- This sulfuric acid solution is returned to the electrolytic reaction tank 10 by means of the thermal decomposition circulation pipe 22 and the liquid feed pump 23, so that the cleaning can be continued with the persulfuric acid solution 2 whose cleaning effect has been recovered.
- the persulfuric acid solution 2 can be regenerated by repeatedly using the persulfuric acid solution 2 that does not require the addition of hydrogen peroxide water or ozone. Effective cleaning can be continued.
- the washing tank 1 includes a heater 21 that heats the stored persulfuric acid solution 2, and an ultrapure water supply line 25 that replenishes the persulfuric acid solution 2 with ultrapure water.
- Electrolytic reaction tanks 10 a and 10 b corresponding to the electrolytic reaction apparatus are connected to the washing tank 1 by a return pipe 4 and a feed pipe 5.
- a liquid feed pump 6 is interposed in the return pipe 4, and a heat exchanger 7 is provided between the return pipe 4 and the feed pipe 5 as in the first embodiment.
- the electrolytic reaction tanks 10a and 10b are connected in series, the return pipe 4 is connected to the electrolytic reaction tank 10a, and the feed pipe 5 is connected to the electrolytic reaction tank 10b.
- a connecting pipe 4a is connected between the electrolytic reaction tank 10a and the electrolytic reaction tank 10b. That is, the liquid is passed through the return pipe 4, the electrolytic reaction tank 10a, the connecting pipe 4a, the electrolytic reaction tank 10b, and the feed pipe 5 in this order.
- the electrolytic reaction tank 10a is provided with an anode l la and a cathode 12a
- the electrolytic reaction tank 10b is provided with an anode l lb and a cathode 12b
- a predetermined gap is provided between the anode 11a and the cathode 12a.
- the bipolar electrode 13a "-13a is disposed, and the bipolar electrode 13b'13b is disposed at a predetermined interval between the anode l ib and the cathode 12b.
- the electrolytic cell is a bipolar cell.
- the electrodes lla, ib, 12a, 12b, 13a, and 13b are also constituted by diamond electrodes.
- the electrodes are manufactured by doping the diamond thin film with boron in the same manner as in Embodiment 1.
- the anode 11a and the cathode 12a, and the anode l ib and the cathode 12b are connected in parallel to the DC power source 14. Electrolysis by this DC electrolysis is possible in the reactors 10a and 10b.
- the washing tank 1 sulfuric acid having a sulfuric acid concentration of 8 to 18 M and ultrapure water are accommodated and heated to about 130 ° C. by the heater 21. Since the mixing ratio of sulfuric acid and ultrapure water includes transpiration of ultrapure water, ultrapure water is replenished using the ultrapure water supply line 25 and the mixing ratio is adjusted appropriately.
- the sulfuric acid solution is fed to the electrolytic reaction tank 10a by the liquid feed pump 6.
- the anode l la and the cathode 12a are energized by the DC power source 14 to thereby generate bipolar power.
- Pole 13a '13a is polarized. Solution is fed to the electrolysis reactor 10a is passing liquid linear velocity is passed through by 1 ⁇ 10, OOOmZhr, current density at the diamond electrode surface from 10 to 100, is energized so that 000 AZM 2.
- the solution passing through the electrolytic reaction tank 10a generates persulfate ions as well as the sulfate ion force, and is further sent to the electrolytic reaction tank 10b via the connecting pipe 4a.
- the electrolytic reaction tank 10b sulfate ion force persulfate ions are generated, and a high-concentration persulfate solution 2 is obtained.
- the high-concentration persulfate solution 2 is sent to the washing tank 1 through the feed pipe 5.
- the current density at the diamond electrode surface even in an electrolytic reactor 10b is 10 to 100, and One Do and OOOAZm 2.
- the persulfuric acid solution 2 having a high concentration is accommodated by the electrolysis, and the semiconductor wafer 30 is cleaned in the same manner as described above. It is effectively peeled and removed.
- the persulfuric acid solution 2 in the washing tank 1 gradually decreases due to self-decomposition, the persulfuric acid solution 2 is sent to the electrolytic reaction tanks 1 Oa and 10b through the return pipe 4 and the liquid feed pump 6 to be electrolyzed.
- the sulfuric acid concentration is increased and regenerated.
- heat exchange is performed in the heat exchange 7 with the persulfuric acid solution 2 which is subjected to the electrolytic treatment in the electrolytic reaction tank 10b and moves through the feed pipe 5.
- the persulfuric acid solution 2 moving through the return pipe 4 due to heat exchange drops to a few tens of degrees Celsius, which is slightly higher than 40 ° C, and the persulfuric acid solution 2 moving through the feed pipe 5 is 130 ° It is heated up to a few hundreds of temperatures slightly lower than C. After that, the persulfuric acid solution 2 moving through the return pipe 4 becomes a temperature of about 40 ° C. suitable for the electrolytic reaction by natural cooling or the like.
- the persulfuric acid solution 2 moving through the feed pipe 5 is sent to the washing tank 1, and then the temperature is adjusted to the optimum temperature for washing by heating with the heater 21.
- a return pipe 4 having at least an inner surface made of tetrafluoroethylene is connected to the electrolytic reaction tank 10a, and a feed pipe 5 having an inner face made of tetrafluoroethylene is also connected to the electrolytic reaction tank 10b.
- a liquid feed pump 6 for feeding the persulfuric acid solution 2 is interposed in the return pipe 4, and a heat exchanger 7 is interposed between the return pipe 4 and the feed pipe 5.
- the return pipe 4, the feed pipe 5, and the liquid feed pump 6 constitute a circulation line of the present invention.
- a connecting pipe 4a is connected between the electrolytic reaction tank 10a and the electrolytic reaction tank 10b.
- the return pipe 4, the electrolytic reaction tank 10a, the connecting pipe 4a, the electrolytic reaction tank 10b, and the feed pipe 5 The solution is configured to pass through in order.
- the electrolytic reaction tank 10a is provided with an anode l la and a cathode 12a
- the electrolytic reaction tank 10b is provided with an anode l lb and a cathode 12b
- a predetermined gap is provided between the anode 11a and the cathode 12a.
- bipolar electrodes 13a "-13a are arranged
- bipolar electrodes 13b" '13b are arranged at a predetermined interval between the anode l ib and the cathode 12b.
- These electrodes l la, l lb, 12a, 12b, 13a, 13bi and diamond electrodes are made up of this!
- Open / close valves 15a and 15b are provided on the front end side of the return pipe 4 and the feed pipe 5 in the circulation line, and the sulfuric acid recycling type persulfuric acid supply device 40 of the present invention is constituted by these structures, and the open / close valves are provided.
- the persulfuric acid solution can be fed from the feed pipe 5 provided with the valve 15a to the cleaning device on the supply side, and the sulfuric acid solution is also refluxed through the return pipe provided with the on-off valve 15b so that the sulfuric acid solution is refluxed.
- Persulfuric acid can be regenerated with 10a and 10b.
- the liquid flow velocity and current density at this time are set appropriately as in the above embodiment.
- the persulfuric acid solution regenerated in the electrolytic reaction tanks 10a and 10b can be used for washing by connecting to the washing tank 1.
- the persulfuric acid solution can be supplied to other washing devices, and the connection destination is switched by a switching valve or the like to a plurality of washing devices. It can be done by supplying persulfuric acid.
- the sulfuric acid recycling type persulfuric acid supply device 40 can clean the semiconductor wafer 30 while circulating the solution between the cleaning tank 1 as in the sulfuric acid recycling type cleaning system of the above embodiment. [0074] (Embodiment 3— 1)
- the electrolytic reaction tanks 10a and 10b are connected in series by the connecting pipe 4a, the return pipe 4 is connected to the electrolytic reaction tank 10a, and the feed pipe 5 is connected to the electrolytic reaction tank 10b.
- a liquid feed pump 6 is interposed in the return pipe 4, and a heat exchanger 7 is interposed between the return pipe 4 and the feed pipe 5.
- an anode l la that also has a diamond electrode force, a cathode 12a, and a bipolar electrode 13a "'13a are arranged. 12b, bipolar electrodes 13b '"13b are arranged.
- a sulfuric acid concentration measuring device 50 for measuring the sulfuric acid concentration of the cleaning liquid by circulating a part of the cleaning liquid in the cleaning tank 1 includes a sulfuric acid concentration measuring means. Connected as.
- the sulfuric acid concentration measuring instrument 50 is configured to measure the sulfuric acid concentration by an absorbance method, and a known apparatus can be used.
- an ultrapure water supply line 25 is connected to the cleaning tank 1, and an electromagnetic on-off valve 26 is interposed in the ultrapure water supply line 25.
- the electromagnetic on / off valve 26 can be controlled to open and close by the sulfuric acid concentration measuring instrument 50 described above.
- the sulfuric acid concentration measuring instrument 50 the sulfuric acid concentration to be maintained in the washing tank 1 is set in advance as a reference value, and the reference value is stored in an appropriate storage means such as a memory and read out as necessary. .
- sulfuric acid is accommodated in the washing tank 1, and ultrapure water is added to adjust the sulfuric acid concentration to a predetermined concentration within the range of 8 to 18M. Heat to about 130 ° C.
- the sulfuric acid concentration to be maintained is set in the sulfuric acid concentration measuring device 50 as a reference value, and the electromagnetic on-off valve 26 is closed at the start of cleaning.
- the sulfuric acid solution is fed to the electrolytic reaction tank 10a by the liquid feed pump 6.
- the sulfate ion force in the solution is also generated as persulfate ions, and is further sent to the electrolytic reaction tank 10b through the connecting tube 4a, and the sulfate ions in the solution are also generated.
- a highly concentrated persulfuric acid solution 2 is obtained.
- the liquid flow velocity and the current density are appropriately set as in the above embodiment.
- a high-concentration persulfuric acid solution 2 is accommodated, and the semiconductor wafer 30 is cleaned in the same manner as described above, and the resist and the like on the semiconductor wafer 30 are peeled and removed.
- the persulfuric acid solution 2 in the washing tank 1 gradually decreases in persulfuric acid concentration due to self-decomposition.However, the persulfuric acid solution 2 is sent to the electrolytic reaction tanks 10a and 10b through the return pipe 4 and the liquid feed pump 6 and electrolyzed. Acid ions are regenerated. Also in this embodiment, effective washing can be continued while regenerating the persulfuric acid solution 2 by repeatedly using the sulfuric acid solution.
- the sulfuric acid concentration of the solution circulating in the washing tank 1 and the electrolytic reaction tanks 10a and 10b gradually increases due to the electrolysis and evaporation of water.
- the sulfuric acid concentration of the solution is continuously or timely measured by the sulfuric acid concentration measuring device 50. Further, the sulfuric acid concentration measuring device 50 compares the measured concentration with the set value, and when the measured concentration is higher than the set concentration by 0.2M or more, the electromagnetic on-off valve 26 is opened to open the ultrapure water supply line 25.
- control is performed so that ultrapure water is injected into washing tank 1 from At this time, the injection amount can also be determined in advance, and while the sulfuric acid concentration meter 50 measures the sulfuric acid concentration, the injection is continued until the measured concentration is more than 0.2M higher than the set concentration. It may be continued.
- the solenoid on / off valve 26 is closed by the control of the sulfuric acid concentration meter 50.
- the amount of the solution is measured by controlling the injection of ultrapure water into the solution by measuring the sulfuric acid concentration of the solution to maintain the sulfuric acid concentration of the solution appropriately. Therefore, it is possible to estimate the sulfuric acid concentration of the solution and control the injection of ultrapure water into the solution.
- the liquid level of the solution is measured by measuring the liquid level height of the solution stored in the cleaning tank 1 provided in the cleaning device. This will be described below. Note that the same reference numerals are given to the same configurations as those in the above embodiment, and the description thereof is omitted or simplified.
- Liquid level sensors 5 la and 5 lb are arranged in the vicinity of the liquid level as means for measuring the liquid level.
- the liquid level sensors 51a and 51b can detect the lower limit height of the range in which the light reaches as the liquid level by receiving light emitted from the liquid level sensor 51a with the liquid level sensor 51b, for example.
- the configuration of the liquid level height measuring means is not particularly limited as the present invention, and for example, the liquid level height can be measured by a float type sensor. However, since the oxidizing power of persulfuric acid solution 2 is strong, a sensor that does not contact the solution is desirable.
- control unit (not shown) that receives the output of the liquid level sensor 51b, the liquid level height to be maintained is set as a set value in advance, and the sulfuric acid concentration of the solution is appropriately maintained by the liquid level height. It is estimated that Further, the control unit can control the opening / closing of the electromagnetic switching valve 26 in accordance with the measured liquid level.
- the liquid level in the cleaning tank 1 is continuously or timely measured by the liquid level sensors 51a and 51b.
- the control unit receives the measurement output from the liquid level sensor 51b, compares the liquid level height based on the measurement result with the set liquid level height, and the liquid level height is lower than the set value by a predetermined value or more. If so, the electromagnetic opening / closing valve 26 is controlled so that ultrapure water is injected into the cleaning tank 1 from the ultrapure water supply line 25.
- the predetermined value for starting the control of the electromagnetic on-off valve 26 by the liquid level sensor 5 lb can be determined as appropriate, and may be set to zero.
- the amount of change in the liquid surface height at which the concentration of the solution increases by 0.2M as the water content decreases from the set liquid surface height can be determined as a predetermined value.
- the injection amount can be determined in advance during the injection control of ultrapure water, and the liquid level measured by measuring the liquid level with the liquid level sensors 51a and 51b is the set liquid level. The injection may be continued so that the difference from the height is within a predetermined value.
- Embodiment 3-2 the concentration of sulfuric acid in the solution is controlled appropriately by controlling the injection of ultrapure water into the solution by measuring the amount of the solution based on the liquid level in the washing tank! However, by measuring the mass of the solution in the washing tank, it is possible to estimate the sulfuric acid concentration of the solution and control the injection of ultrapure water into the solution.
- the embodiment will be described below.
- symbol is attached
- the cleaning tank 1 is placed on a mass meter 52 that is a liquid mass measuring means, and a change in the liquid mass in the cleaning tank 1 can be measured by the mass meter 52.
- the mass meter 52 determines a liquid mass at which a predetermined sulfuric acid concentration is obtained in advance. It is estimated that the sulfuric acid concentration of the solution is properly maintained by the mass.
- the mass meter 52 can further control the opening / closing operation of the electromagnetic on / off valve 26.
- the mass meter 52 is controlled to inject ultrapure water into the washing tank 1 from the ultrapure water supply line 25.
- the predetermined amount can be determined as appropriate, and the value of the opening may be determined.
- the set mass force may be determined as a predetermined value by which the moisture change decreases and the concentration of the solution increases by 0.2M.
- the mass of the cleaning tank 1 is measured continuously or in a timely manner by the above-mentioned 52 mass meters.
- the mass of the cleaning tank 1 is constant, and the measurement change of the mass meter 52 indicates the mass change of the solution in the cleaning tank 1.
- the mass meter 52 compares the measured mass with the set mass, and when the measured mass is lighter than the set value by a predetermined value or more, controls the electromagnetic on-off valve 26 to wash from the ultrapure water supply line 25.
- Inject tank 1 with ultrapure water the injection amount can be determined in advance, and the injection is continued so that the measured mass becomes the set mass while measuring the mass with the mass meter 52. May be.
- the sulfuric acid concentration of the solution is appropriately maintained.
- Conductive diamond electrode (boron 5, OOOppm dope), anode area: 40dm 2 electrolysis conditions
- a high-concentration sulfuric acid solution adjusted with a ratio of 98% concentrated sulfuric acid 401 and ultrapure water 101 was accommodated in the washing tank, and heated to 130 ° C.
- the electrolytic reaction tank two tanks in which 10 conductive diamond electrodes with boron doping (boron doping amount: 5, OOOppm) were incorporated on a Si substrate with a diameter of 15 cm and a thickness of 1 mm were arranged in series. Effective electrolytic area for electrolysis, the whole is 30d m 2, by setting the current density to 3, OOOAZm 2, and electrolysis was performed under 40 ° C. Sampling water from the electrolytic reaction tank confirmed that the persulfuric acid production rate was 3 gZlZhr.
- a solution containing 98% concentrated sulfuric acid 401 and 35% peroxyhydrogen peroxide 101 was heated and maintained at 130 ° C. in a washing tank.
- the resist-coated wafer was immersed in this solution in the same immersion cycle as in Example 12 to dissolve the resist. Up to the first 6 cycles (300 wafers to be cleaned), the solution turned brown immediately after immersion of the wafer, but became clear and colorless in less than 10 minutes, and the TOC concentration was also detected. However, for the next 50 sheets, the solution remained brown even after 10 minutes immediately after immersion, and a residual TOC concentration of 30 mgZl was observed. Therefore, the solution 101 in the washing tank was drawn out, and hydrogen peroxide solution 101 was further added, and the solution was heated and maintained at 130 ° C.
- Example 12 Under the conditions of Example 12, the cleaning test was performed by changing the temperature of the persulfuric acid solution in the cleaning tank. Other conditions are the same as in Example 1-2.
- the cleaning solution 1 In the cleaning example performed by heating to 80 ° C, a sufficient persulfuric acid production rate (3gZlZhr) was secured for the TOC production rate (0.06g / l / hr) in the first cycle. The rate of self-decomposition of persulfuric acid was large. Sulfate sufficient to remove TOC did not remain, and 30 mgZl of TOC concentration remained in the solution. Therefore, it is clear that the temperature of the cleaning liquid is preferably 100 ° C to 170 ° C.
- Example 1-2 Next, a cleaning test was performed under the conditions of Example 1-2 by changing the temperature of the solution in the electrolytic reaction tank.
- the other test conditions are the same as in Example 1-2.
- the persulfuric acid production rate was 4.5 [g / 1 / hr], whereas the TOC production rate was 0.06 [g / 1 / hr].
- a sufficient amount of persulfuric acid can be secured, but since the temperature of the cleaning liquid is 130 ° C, it is necessary to heat for 125 ° C, and not only a large amount of heat energy is required, but also the piping route is lengthened. Most of the persulfuric acid was consumed before reaching the washing tank, and the TOC concentration of 30 mgZl remained in the solution in the first cycle. On the other hand, the temperature of the solution in the electrolytic reactor is 10.
- the persulfuric acid production rates were 4 [g / l / hr], 3 [g / 1 / hr], 1.2 [gZlZhr], 0.9, respectively.
- [GZlZhr] and persulfate ions were efficiently generated.
- no electrode wear was observed in the electrolytic treatment for 1,000 hours.
- the persulfuric acid production rate was 0.25 [g / l / hr], and the production of persulfate ions was clearly reduced.
- Example 12 a washing test was performed under the conditions of Example 12 by changing the persulfuric acid production rate by changing the current density in the electrolytic reaction tank.
- the other test conditions are the same as in Example 1-2.
- Persulfuric acid / T O C Persulfuric acid production rate / T O C production rate
- Example 12 a cleaning test was performed under the conditions of Example 1-2, changing the persulfuric acid production rate by changing the liquid flow rate in the electrolytic reaction tank.
- the other test conditions are the same as in Example 12.
- Persulfuric acid / T O C Persulfuric acid production rate / T0C production rate
- High-concentration sulfuric acid adjusted at a ratio of 40 liters of 98% concentrated sulfuric acid and 8 liters of ultrapure water in the washing tank A solution was prepared and heated to 130 ° C.
- the electrolytic reaction tank as shown in FIG. 3, two tanks each comprising 10 conductive diamond electrodes doped with boron on a Si substrate having a diameter of 15 cm and a thickness of 1 mm were arranged in series. Effective anode area for electrolysis is 30Dm 2, current density 30A / dm 2 to ⁇ this setting, electrolysis was 40 ° C.
- the outlet water of the electrolytic reactor was sampled, it was confirmed that the persulfate ion production rate was 3 gZLZhr.
- the solution in the cleaning tank was colored brown and the TOC concentration was 30 mgZL, but the solution in the cleaning tank was colorless and transparent by a circulation treatment of less than 10 minutes.
- the TOC concentration was below the detection limit.
- the ability to continue such wafer cleaning for 8 hours (2,400 wafers were cleaned) The resist removal effect of the high-concentration sulfuric acid solution was good, and the TOC concentration was below the detection limit. Therefore, it continued for another 32 hours (the number of washed wafers was 9,600, the total number of processed wafers was 12,000), but the resist stripping effect of the high-concentration sulfuric acid solution was good, and the TOC concentration was below the detection limit.
- the residue is about 500 ⁇ : LOOOpgZcm 2 and high cleanliness. I could't get a wafer. Furthermore, when the periphery of the pattern was observed with a scanning electron microscope at a low acceleration voltage, it was confirmed that a large amount of resist residue adhered.
- a high-concentration sulfuric acid solution prepared by mixing 40 liters of 97% concentrated sulfuric acid and 8 liters of ultrapure water was prepared in a washing tank and heated to 130 ° C.
- two electrolysis cells were arranged in series, each incorporating 10 conductive diamond electrodes doped with boron on a Si substrate having a diameter of 15 cm and a thickness of 1 mm.
- the effective anode area for electrolysis was 30 dm 2 , and the current density was set to 30 AZdm 2 and electrolysis was performed at 40 ° C. Sampling of the electrolytic reactor outlet solution confirmed that the persulfate ion production rate was 3 gZLZhr.
- a 6-inch silicon wafer with resist is immersed in 50 cycles for 10 minutes with an immersion cycle of 10 minutes.
- the total processing time is 40 hours (total number of wafers processed is 12,000).
- Dissolution was performed (TOC generation rate was 0.04 g / L / hr).
- the sulfuric acid concentration in the sulfuric acid solution is monitored with a sulfuric acid concentration meter, and when the sulfuric acid concentration reaches 16.6M, ultrapure water is automatically injected until the sulfuric acid concentration reaches 16.4M. did. As a result, the sulfuric acid concentration during the treatment time changed in the range of 16.3 to 16.7M.
- a high-concentration sulfuric acid solution prepared by mixing 40 liters of 97% concentrated sulfuric acid and 8 liters of ultrapure water was prepared in a washing tank and heated to 130 ° C.
- two electrolysis cells were arranged in series, each incorporating 10 conductive diamond electrodes doped with boron on a Si substrate having a diameter of 15 cm and a thickness of 1 mm.
- An effective anode area 30Dm 2 for electrolysis and the current density is set to 30 AZdm 2, and electrolysis was performed under 40 ° C.
- the outlet solution of the electrolytic reactor was sampled, it was confirmed that the persulfate ion production rate was 3 gZLZhr.
- the liquid level of the sulfuric acid solution is monitored by the liquid level sensor installed in the cleaning tank, and when the liquid level drops by 5 mm, ultrapure water is automatically injected until the initial liquid level is reached. did.
- the sulfuric acid concentration in the treatment time ranged from 16.2 to 16.7M.
- a high-concentration sulfuric acid solution prepared by mixing 40 liters of 97% concentrated sulfuric acid and 8 liters of ultrapure water was prepared in a washing tank and heated to 130 ° C.
- two electrolysis cells were arranged in series, each incorporating 10 conductive diamond electrodes doped with boron on a Si substrate having a diameter of 15 cm and a thickness of 1 mm.
- the effective anode area for electrolysis was 30 dm 2 , and the current density was set to 30 AZdm 2 and electrolysis was performed at 40 ° C. Sampling of the electrolytic reactor outlet solution confirmed that the persulfate ion production rate was 3 gZLZhr.
- a 6-inch silicon wafer with resist is immersed in 50 cycles for 10 minutes with an immersion cycle of 10 minutes.
- the total processing time is 40 hours (total number of wafers processed is 12,000).
- Dissolution was performed (TOC generation rate was 0.04 gZLZhr).
- the entire washing tank was installed on the load cell.
- cleaning treatment can be performed on various materials to be cleaned.
- an electronic material substrate such as a silicon wafer, a glass substrate for liquid crystal, or a photomask substrate is used. It is suitable for a purpose of performing a cleaning process on a target. More specifically, it can be used for a peeling process of an organic compound such as a resist residue attached on a semiconductor substrate. In addition, it can be used in a process for removing foreign matters such as fine particles and metals adhering to a semiconductor substrate.
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Description
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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KR1020077007934A KR101222880B1 (ko) | 2004-09-17 | 2005-09-14 | 황산 리사이클형 세정 시스템 |
EP05783205A EP1801265B1 (en) | 2004-09-17 | 2005-09-14 | Cleaning system of sulfuric acid recycling type and persulfuric acid feeder of sulfuric acid recycling type |
US11/663,324 US9593424B2 (en) | 2004-09-17 | 2005-09-14 | Sulfuric acid recycling type cleaning system and a sulfuric acid recycling type persulfuric acid supply apparatus |
AT05783205T ATE510048T1 (de) | 2004-09-17 | 2005-09-14 | Reinigungssystem vom schwefelsäurerezyklierungstyp und perschwefelsäure-dosierer vom schwefelsäurerezyklierungstyp |
CN2005800393762A CN101061261B (zh) | 2004-09-17 | 2005-09-14 | 硫酸循环型清洗系统以及硫酸循环型过硫酸供给装置 |
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JP2004-271604 | 2004-09-17 | ||
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JP2005232825A JP4462146B2 (ja) | 2004-09-17 | 2005-08-11 | 硫酸リサイクル型洗浄システムおよび硫酸リサイクル型過硫酸供給装置 |
JP2005-232825 | 2005-08-11 |
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EP (1) | EP1801265B1 (ja) |
JP (1) | JP4462146B2 (ja) |
KR (1) | KR101222880B1 (ja) |
CN (1) | CN101061261B (ja) |
AT (1) | ATE510048T1 (ja) |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007262531A (ja) * | 2006-03-29 | 2007-10-11 | Kurita Water Ind Ltd | 電解セルおよび該電解セルを用いた硫酸リサイクル型洗浄システム |
JP2007262532A (ja) * | 2006-03-29 | 2007-10-11 | Kurita Water Ind Ltd | 電解ガス処理装置および硫酸リサイクル型洗浄システム |
US8454754B2 (en) | 2007-02-09 | 2013-06-04 | Shibaura Mechatronics Corporation | Cleaning method and method for manufacturing electronic device |
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Also Published As
Publication number | Publication date |
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TW200610841A (en) | 2006-04-01 |
EP1801265A1 (en) | 2007-06-27 |
EP1801265B1 (en) | 2011-05-18 |
SG158142A1 (en) | 2010-01-29 |
CN101061261A (zh) | 2007-10-24 |
TWI366611B (en) | 2012-06-21 |
EP1801265A4 (en) | 2009-06-17 |
ATE510048T1 (de) | 2011-06-15 |
JP2006114880A (ja) | 2006-04-27 |
JP4462146B2 (ja) | 2010-05-12 |
KR20070101219A (ko) | 2007-10-16 |
KR101222880B1 (ko) | 2013-01-17 |
US20080251108A1 (en) | 2008-10-16 |
US9593424B2 (en) | 2017-03-14 |
CN101061261B (zh) | 2010-09-01 |
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