WO2017164185A1 - 基板処理方法および基板処理装置 - Google Patents
基板処理方法および基板処理装置 Download PDFInfo
- Publication number
- WO2017164185A1 WO2017164185A1 PCT/JP2017/011264 JP2017011264W WO2017164185A1 WO 2017164185 A1 WO2017164185 A1 WO 2017164185A1 JP 2017011264 W JP2017011264 W JP 2017011264W WO 2017164185 A1 WO2017164185 A1 WO 2017164185A1
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- WIPO (PCT)
- Prior art keywords
- substrate
- ozone
- hydrofluoric acid
- main surface
- acid solution
- Prior art date
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- 239000000758 substrate Substances 0.000 title claims abstract description 538
- 238000003672 processing method Methods 0.000 title claims abstract description 21
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- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 396
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 334
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 244
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 19
- 229910052710 silicon Inorganic materials 0.000 claims description 19
- 239000010703 silicon Substances 0.000 claims description 19
- 238000007599 discharging Methods 0.000 claims description 12
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- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 5
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
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- 229910021529 ammonia Inorganic materials 0.000 description 1
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- 238000000137 annealing Methods 0.000 description 1
- SWXQKHHHCFXQJF-UHFFFAOYSA-N azane;hydrogen peroxide Chemical compound [NH4+].[O-]O SWXQKHHHCFXQJF-UHFFFAOYSA-N 0.000 description 1
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- DKAGJZJALZXOOV-UHFFFAOYSA-N hydrate;hydrochloride Chemical compound O.Cl DKAGJZJALZXOOV-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- 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
- H01L21/02096—Cleaning only mechanical cleaning
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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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/12—Brushes
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- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/30—Cleaning by methods involving the use of tools by movement of cleaning members over a surface
- B08B1/32—Cleaning by methods involving the use of tools by movement of cleaning members over a surface using rotary cleaning members
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/04—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by a combination of operations
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
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- H01L21/02082—Cleaning product to be cleaned
- H01L21/0209—Cleaning of wafer backside
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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- H01L21/67005—Apparatus not specifically provided for elsewhere
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- H01L21/6704—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing
- H01L21/67046—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing using mainly scrubbing means, e.g. brushes
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- H01L21/67051—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing using mainly spraying means, e.g. nozzles
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- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68728—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a plurality of separate clamping members, e.g. clamping fingers
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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
- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68792—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by the construction of the shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
- B08B2203/005—Details of cleaning machines or methods involving the use or presence of liquid or steam the liquid being ozonated
Definitions
- the present invention relates to a substrate processing method and a substrate processing apparatus for processing a main surface of a substrate.
- substrates to be processed include semiconductor wafers, liquid crystal display substrates, plasma display substrates, FED (Field-Emission-Display) substrates, optical disk substrates, magnetic disk substrates, magneto-optical disk substrates, photo Mask substrates, ceramic substrates, solar cell substrates and the like are included.
- a single-wafer type substrate processing apparatus that cleans substrates one by one includes, for example, a spin chuck that rotates while holding the substrate substantially horizontally, and a main surface (for example, an upper surface) of the substrate that is held and rotated by the spin chuck For example, a sponge-like cleaning brush, and a nozzle for supplying a cleaning chemical to a substrate held and rotated by a spin chuck.
- the cleaning process includes a process of removing foreign substances on the main surface of the semiconductor wafer by using an etching action of a chemical solution.
- SC1 ammonia hydrogen peroxide solution mixture
- the substrate is oxidized by the oxidizing action of the hydrogen peroxide component contained in SC1.
- the main surface is oxidized and a silicon oxide film is formed on the main surface.
- substrate is removed with the foreign material adhering to the said main surface by the ammonia component contained in SC1.
- by scrubbing the main surface of the substrate with a cleaning brush foreign substances adhering to the main surface of the substrate can be effectively removed.
- the main surface of the substrate is oxidized with a hydrogen peroxide solution having a relatively weak oxidizing power, so that the amount of oxide film formed on the main surface of the substrate is small. That is, the etching performance (foreign matter removal performance) by SC1 is not so high. In this case, even when scrubbing the main surface with the cleaning brush is performed in parallel with the supply of SC1, the cleaning efficiency is low. Therefore, when a large amount of foreign matter adheres to the main surface of the substrate to be cleaned, there is a problem that it takes a long time to clean the main surface and the throughput is poor.
- the inventors of the present application are considering using a hydrofluoric acid ozone solution in which ozone is dissolved in hydrofluoric acid as the cleaning chemical.
- the main surface of the substrate may be hydrophobized by the action of hydrofluoric acid contained in the chemical solution.
- the brush is brought into contact with the main surface in a state where the main surface of the substrate is hydrophobic, there is a possibility that the foreign matter scraped off by the cleaning brush will reattach to the main surface of the substrate.
- an object of the present invention is to provide a substrate processing method and a substrate processing apparatus capable of efficiently cleaning the main surface of a substrate using a hydrofluoric acid ozone solution while suppressing or preventing the reattachment of foreign matters via a cleaning brush. It is to be.
- a substrate holding step for holding a substrate by a substrate holding unit and an ozone-containing hydrofluoric acid solution in which ozone is dissolved in a hydrofluoric acid solution are supplied to one main surface of the substrate held by the substrate holding unit.
- a brush cleaning step for cleaning the one main surface by bringing a cleaning brush into contact with the one main surface of the substrate; and the ozone An ozone water supply step for supplying ozone water to the one main surface of the substrate before the start of the brush cleaning step or in parallel with the brush cleaning step after the containing hydrofluoric acid solution supplying step;
- the ozone-containing hydrofluoric acid solution supplying step the ozone-containing hydrofluoric acid solution is supplied to one main surface of the substrate, and an oxide film is formed on the one main surface of the substrate by the oxidizing action of ozone contained in the ozone-containing hydrofluoric acid solution. Further, the oxide film formed on one main surface of the substrate is peeled off (lifted off) from the one main surface by the oxide film etching action of hydrofluoric acid contained in the ozone-containing hydrofluoric acid solution.
- the cleaning brush is brought into contact with one main surface of the substrate, so that the separated foreign matter is scraped off by the cleaning brush. Thereby, the oxide film and foreign matter after peeling can be removed from the one main surface of the substrate.
- the ozone-containing hydrofluoric acid solution supplying step there is a possibility that one main surface of the substrate may be hydrophobized by hydrofluoric acid contained in the ozone-containing hydrofluoric acid solution. Since the ozone-containing hydrofluoric acid solution uses a hydrofluoric acid solution as a solvent, the hydrofluoric acid contained in the ozone-containing hydrofluoric acid solution due to the low hydrofluoric acid concentration and the hydrophilizing action of ozone contained in the ozone-containing hydrofluoric acid solution.
- the substrate is not cleaned after the end of the ozone-containing hydrofluoric acid solution supplying process.
- at least a part of the main surface may be hydrophobic. Therefore, if the brush cleaning process is performed after the ozone-containing hydrofluoric acid solution supplying process, foreign matter scraped off by the cleaning brush may be reattached to one main surface of the substrate.
- ozone water is supplied to one main surface of the substrate in an ozone water supply process that is performed prior to the start of the brush cleaning process or in parallel with the brush cleaning process. Therefore, even if a part of the substrate exhibits hydrophobicity after the ozone-containing hydrofluoric acid solution supplying step is completed, the hydrophobic region can be hydrophilized by performing the ozone water supplying step thereafter.
- the brush cleaning process can be performed in a state where the entire area of the one main surface of the substrate is made hydrophilic. Thereby, the reattachment of the foreign material to the one main surface of the substrate through the cleaning brush can be prevented.
- the ozone water supply step includes a step of supplying ozone water to the one main surface of the substrate prior to the start of the brush cleaning step after the ozone-containing hydrofluoric acid solution supply step.
- the brush cleaning process can be started in a state where the entire area of the one main surface of the substrate is made hydrophilic. Thereby, the reattachment of the foreign substance to the one main surface of the substrate can be prevented more reliably.
- the ozone-containing hydrofluoric acid solution supplying step includes a step of discharging the ozone-containing hydrofluoric acid solution toward a central portion of one main surface of the substrate held by the substrate holding unit. Also good.
- the substrate processing method may further include a substrate rotating step of rotating the substrate around a predetermined rotation axis in parallel with the ozone-containing hydrofluoric acid solution supplying step.
- the ozone-containing hydrofluoric acid solution supplied to the central portion of the one main surface of the substrate receives a centrifugal force due to the rotation of the substrate and spreads radially toward the outer peripheral portion of the one main surface of the substrate. Therefore, the ozone-containing hydrofluoric acid solution can be spread over the entire area of the one main surface of the substrate. In other words, hydrofluoric acid and ozone can be distributed over the entire area of the one main surface of the substrate.
- the ozone water supply step may include a central ozone water discharge step for discharging ozone water toward the central portion of the one main surface of the substrate.
- the ozone water supplied to the central portion of the one main surface of the substrate receives a centrifugal force due to the rotation of the substrate and spreads radially toward the outer peripheral portion of the one main surface of the substrate. Therefore, ozone water can be spread over the entire area of the one main surface of the substrate. In other words, not only the central portion of the one main surface of the substrate but also the outer peripheral portion of the one main surface of the substrate can be hydrophilized.
- the ozone water supply step may include an outer peripheral ozone water discharge step of discharging ozone water toward the outer peripheral portion of the one main surface of the substrate.
- the ozone water discharged toward the outer peripheral portion of the one main surface of the substrate is supplied to the entire outer peripheral portion of the one main surface of the substrate by the rotation of the substrate.
- substrate can be made hydrophilic efficiently, and, thereby, the reattachment of the foreign material to the one main surface of a board
- the ozone concentration of the ozone water supplied to the one main surface of the substrate in the ozone water supply step may be 50 ppm or more.
- the ozone concentration of the ozone water supplied in the ozone water supply step is 50 ppm or more, one main surface of the substrate can be made hydrophilic.
- the brush cleaning process can be performed in a state where the entire area of the one main surface of the substrate is made hydrophilic.
- a protective fluid supply step of supplying a protective fluid to the other main surface in order to prevent or suppress the sneak of the ozone-containing hydrofluoric acid solution to the other main surface may be included.
- the device forming surface of the substrate can be protected by the protective fluid supplied to the device forming surface of the substrate. Therefore, it is possible to perform a cleaning process using the ozone-containing hydrofluoric acid solution and the cleaning brush on the one main surface of the substrate while protecting the other main surface of the substrate.
- the substrate may include a semiconductor substrate.
- the other main surface of the substrate may be a device forming surface for forming a device.
- the one main surface of the substrate may be a device non-formation surface on which the device is not formed.
- this method it is possible to perform the cleaning treatment using the ozone-containing hydrofluoric acid solution and the cleaning brush on the device non-forming surface of the substrate while protecting the device forming surface of the substrate. Thereby, the foreign material adhering or forming on the device non-formation surface and scratches formed on the device non-formation surface can be removed.
- the device forming surface may include a metal layer.
- the protective fluid supply step may include a protective gas supply step of supplying a protective gas to the other main surface.
- the protective gas is supplied to the other main surface.
- the other main surface is a device forming surface (particularly, the device forming surface includes a metal layer that dislikes water treatment)
- the other main surface can be protected without supplying water to the other main surface.
- the supply flow rate of the ozone-containing hydrofluoric acid solution is large, the ozone-containing hydrofluoric acid solution may flow around the other main surface against the airflow of the protective gas formed on the other main surface of the substrate. Therefore, the supply flow rate of the ozone-containing hydrofluoric acid solution in the ozone-containing hydrofluoric acid solution supply step is limited.
- the amount of ozone contained in the ozone-containing hydrofluoric acid solution is small, and therefore, after the ozone-containing hydrofluoric acid solution supply step ends There is a possibility that at least a part of one main surface of the substrate exhibits hydrophobicity.
- the ozone-containing hydrofluoric acid solution supplying step includes a step of discharging the ozone-containing hydrofluoric acid solution toward the central portion of one main surface of the substrate, and in parallel with the ozone-containing hydrofluoric acid solution supplying step, When the substrate is rotated around a predetermined rotation axis, ozone does not reach the outer peripheral portion of one main surface of the substrate during the ozone-containing hydrofluoric acid solution supplying step. In this case, at the end of the ozone-containing hydrofluoric acid solution supplying step, the outer peripheral portion of the one main surface exhibits hydrophobicity.
- the brush cleaning process can be performed in a state where the entire area of the one main surface of the substrate is made hydrophilic.
- the discharge flow rate of the ozone-containing hydrofluoric acid solution in the ozone-containing hydrofluoric acid solution supplying step is 0.5 liter / minute or more and 1.0 liter / minute or less. In this case, it is possible to prevent the ozone-containing hydrofluoric acid solution from entering the other main surface of the substrate. Further, the discharge flow rate is more preferably 0.8 liter / min or less, and in this case, it is possible to prevent the ozone-containing hydrofluoric acid solution from flowing into the other main surface of the substrate more reliably.
- the substrate holding step includes a step of holding the substrate in a horizontal posture
- the ozone-containing hydrofluoric acid solution supplying step includes a step of discharging the ozone-containing hydrofluoric acid solution onto the upper surface of the substrate
- the brush The cleaning step may include a step of cleaning the upper surface of the substrate.
- the treatment using the ozone-containing hydrofluoric acid solution and the cleaning brush can be performed on the upper surface of the substrate.
- the one main surface of the substrate may include a silicon-containing surface containing a silicon component.
- a silicon oxide film is formed on one main surface of the substrate by the oxidizing action of ozone contained in the ozone-containing hydrofluoric acid solution. Further, the silicon oxide film formed on one main surface of the substrate is peeled off from the one main surface by the oxide film etching action of hydrofluoric acid contained in the ozone-containing hydrofluoric acid solution. As a result, foreign substances (particles, impurities, peeling of the one main surface, etc.) attached to or formed on one main surface of the substrate are removed, or scratches (chips, dents) formed on the one main surface of the substrate are removed. Etc.) can be removed.
- ozone having a strong oxidizing power is used, a large amount of silicon oxide film can be formed on one main surface of the substrate, whereby a large amount of silicon oxide film can be lifted off from one main surface of the substrate. Thereby, the foreign substance and / or flaw of one main surface of a board
- substrate can be removed efficiently.
- the one main surface of the substrate may include a titanium nitride-containing surface including titanium nitride.
- the present invention provides a substrate holding unit for holding a substrate and an ozone-containing hydrofluoric acid solution for supplying an ozone-containing hydrofluoric acid solution in which ozone is dissolved in a hydrofluoric acid solution to one main surface of the substrate held by the substrate holding unit.
- a cleaning brush drive unit for driving the brush, and controls the ozone-containing hydrofluoric acid solution supply unit, the ozone water supply unit, and the cleaning brush drive unit to control the ozone-containing fluoride on one main surface of the substrate.
- a cleaning brush is provided on the one main surface of the substrate.
- a substrate processing apparatus including a control device that performs an ozone water supply step of supplying ozone water to the one main surface.
- the ozone-containing hydrofluoric acid solution supplying step is performed on the one main surface of the substrate prior to the start of the brush cleaning step or in parallel with the brush cleaning step performed after the ozone-containing hydrofluoric acid solution supplying step.
- the ozone-containing hydrofluoric acid solution supplying step the ozone-containing hydrofluoric acid solution is supplied to one main surface of the substrate, and an oxide film is formed on the one main surface of the substrate by the oxidizing action of ozone contained in the ozone-containing hydrofluoric acid solution. Further, the oxide film formed on one main surface of the substrate is peeled off (lifted off) from the one main surface by the oxide film etching action of hydrofluoric acid contained in the ozone-containing hydrofluoric acid solution.
- the cleaning brush is brought into contact with one main surface of the substrate, so that the separated foreign matter is scraped off by the cleaning brush. Thereby, the oxide film and foreign matter after peeling can be removed from the one main surface of the substrate.
- the ozone-containing hydrofluoric acid solution supplying step there is a possibility that one main surface of the substrate may be hydrophobized by hydrofluoric acid contained in the ozone-containing hydrofluoric acid solution. Since the ozone-containing hydrofluoric acid solution uses a hydrofluoric acid solution as a solvent, the hydrofluoric acid contained in the ozone-containing hydrofluoric acid solution due to the low hydrofluoric acid concentration and the hydrophilizing action of ozone contained in the ozone-containing hydrofluoric acid solution.
- the substrate is not cleaned after the end of the ozone-containing hydrofluoric acid solution supplying process.
- at least a part of the main surface may be hydrophobic. Therefore, if the brush cleaning process is performed after the ozone-containing hydrofluoric acid solution supplying process, foreign matter scraped off by the cleaning brush may be reattached to one main surface of the substrate.
- ozone water is supplied to one main surface of the substrate in an ozone water supply process that is performed prior to the start of the brush cleaning process or in parallel with the brush cleaning process.
- substrate is hydrophilized.
- the ozone water supplying process is performed thereafter to change the hydrophobic area to hydrophilic. Can do.
- the brush cleaning process can be performed in a state where the entire area of the one main surface of the substrate is made hydrophilic, thereby preventing the reattachment of foreign matters to the one main surface of the substrate through the cleaning brush.
- FIG. 1 is an illustrative plan view for explaining an internal layout of a substrate processing apparatus according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view for explaining a configuration example of a processing unit provided in the substrate processing apparatus.
- FIG. 3 is a plan view for explaining a more specific configuration of the spin chuck provided in the substrate processing apparatus.
- FIG. 4 is a bottom view of the configuration of FIG.
- FIG. 5 is a cross-sectional view taken along section line VV in FIG. 6 is an enlarged cross-sectional view showing a part of the configuration of FIG.
- FIG. 7 is an enlarged cross-sectional view showing a configuration in the vicinity of the movable pin provided in the spin chuck.
- FIG. 1 is an illustrative plan view for explaining an internal layout of a substrate processing apparatus according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view for explaining a configuration example of a processing unit provided in the substrate processing apparatus.
- FIG. 8 is a schematic cross-sectional view showing the configuration of the FOM nozzle.
- FIG. 9 is a schematic plan view for explaining the movement of the cleaning brush.
- FIG. 10 is a block diagram for explaining an electrical configuration of a main part of the substrate processing apparatus.
- FIG. 11 is a flowchart for explaining an example of a cleaning process executed by the substrate processing apparatus.
- 12A-12B are schematic diagrams for explaining a processing example of the cleaning processing.
- 12C-12D are schematic diagrams for explaining the process following FIG. 12B.
- 12E-12F are schematic views for explaining the process following FIG. 12D.
- FIG. 13 is a cross-sectional view showing the flow of FOM and inert gas in the outer periphery of the substrate.
- FIG. 14 is a graph showing the test results of the first cleaning test.
- FIG. 1 is an illustrative plan view for explaining an internal layout of a substrate processing apparatus 1 according to an embodiment of the present invention.
- the substrate processing apparatus 1 is a single-wafer type apparatus that processes a disk-shaped substrate W made of a semiconductor wafer (semiconductor substrate) one by one with a processing liquid or a processing gas.
- the substrate processing apparatus 1 includes a load port LP that holds a plurality of carriers C, a reversing unit TU that flips the posture of the substrate W up and down, and a plurality of processing units 2 that process the substrate W.
- the load port LP and the processing unit 2 are arranged at an interval in the horizontal direction.
- the reversing unit TU is disposed on the transport path of the substrate W transported between the load port LP and the processing unit 2.
- the substrate processing apparatus 1 further includes an indexer robot IR disposed between the load port LP and the reversing unit TU, and a center robot disposed between the reversing unit TU and the processing unit 2. It includes CR and a control device 3 that controls the operation of the device provided in the substrate processing apparatus 1 and the opening and closing of the valve.
- the indexer robot IR carries a plurality of substrates W one by one from the carrier C held in the load port LP to the reversing unit TU, and a plurality of sheets are transferred from the reversing unit TU to the carrier C held in the load port LP.
- the substrates W are transferred one by one.
- the center robot CR transports a plurality of substrates W from the reversing unit TU to the processing unit 2 one by one, and transports the plurality of substrates W from the processing unit 2 to the reversing unit TU one by one.
- the center robot CR further transports the substrate W between the plurality of processing units 2.
- the indexer robot IR includes a hand H1 that supports the substrate W horizontally.
- the indexer robot IR moves the hand H1 horizontally. Further, the indexer robot IR moves the hand H1 up and down and rotates the hand H1 around the vertical axis.
- the center robot CR includes a hand H2 that supports the substrate W horizontally. The center robot CR moves the hand H2 horizontally. Further, the center robot CR moves the hand H2 up and down and rotates the hand H2 around the vertical axis.
- the substrate C is accommodated in the carrier C in a state where the surface Wa of the substrate W that is a device formation surface is directed upward (upward posture).
- the control device 3 causes the indexer robot IR to transfer the substrate W from the carrier C to the reversing unit TU with the surface Wa facing upward.
- the control apparatus 3 reverses the board
- the control device 3 causes the center robot CR to transfer the substrate W from the reversing unit TU to the processing unit 2 with the back surface Wb facing upward. Then, the control device 3 causes the processing unit 2 to process the back surface Wb of the substrate W.
- the control device 3 After the back surface Wb of the substrate W has been processed, the control device 3 causes the center robot CR to transport the substrate W from the processing unit 2 to the reversing unit TU with the back surface Wb facing upward. And the control apparatus 3 reverses the board
- FIG. 2 is a schematic cross-sectional view for explaining a configuration example of the processing unit 2 provided in the substrate processing apparatus 1.
- the processing unit 2 includes a box-shaped processing chamber 4 having an internal space, a single substrate W held in the processing chamber 4 in a horizontal posture, and a substrate around a vertical rotation axis A1 passing through the center of the substrate W.
- FOM nozzle 6 for selectively discharging ozone water
- an FOM supply device 7 for selectively supplying FOM and ozone water to the FOM nozzle 6, and an upper surface of the substrate W held by the spin chuck 5
- a water supply unit 8 for supplying water, a cleaning brush 10 for contacting the upper surface of the substrate W and scrubbing the upper surface, and a cleaning for driving the cleaning brush 10
- the drive unit 11, the protective gas supply unit 12 for supplying an inert gas (protective
- the FOM supply unit is configured by the FOM nozzle 6 and the FOM supply device 7.
- the FOM nozzle 6 and the FOM supply device 7 constitute an ozone water supply unit. That is, the FOM supply unit also serves as the ozone water supply unit.
- the processing chamber 4 includes a box-shaped partition wall (not shown), and an FFU (fan filter unit, not shown) as a blower unit that sends clean air from above the partition wall into the partition wall (corresponding to the inside of the processing chamber 4). And an exhaust device (not shown) for exhausting the gas in the processing chamber 4 from the lower part of the partition wall.
- a downflow (downflow) is formed in the processing chamber 4 by the FFU and the exhaust device.
- the spin chuck 5 includes a turntable 107 that can rotate around a rotation axis A1 along the vertical direction.
- a rotating shaft 108 is coupled to the lower surface of the rotation center of the turntable 107 via a boss 109.
- the rotation shaft 108 is a hollow shaft, extends along the vertical direction, and is configured to rotate around the rotation axis A ⁇ b> 1 upon receiving a driving force from the rotation drive unit 103.
- the rotation drive unit 103 may be an electric motor having the rotation shaft 108 as a drive shaft, for example.
- the spin chuck 5 further includes a plurality of (six in this embodiment) holding pins 110 provided at intervals along the circumferential direction on the peripheral edge of the upper surface of the turntable 107.
- the holding pin 110 is configured to hold the substrate W horizontally at an upper substrate holding height spaced apart from the turntable 107 having a substantially horizontal upper surface.
- the spin chuck 5 further includes a protective disk 115 disposed between the upper surface of the turntable 107 and the substrate holding height by the holding pins 110.
- the protection disk 115 is coupled to the turntable 107 so as to be movable up and down, and is provided at a lower position near the upper surface of the turntable 107 and a lower surface of the substrate W held by the holding pins 110 above the lower position. It is possible to move between close positions that are close to each other with a small gap.
- the protective disk 115 is a disk-shaped member having a slightly larger diameter than the substrate W, and a notch for avoiding the holding pin 110 is formed at a position corresponding to the holding pin 110. Yes.
- the rotary shaft 108 is a hollow shaft, and an inert gas supply pipe 170 is inserted through the rotary shaft 108.
- An inert gas supply path 172 that guides an inert gas as an example of a protective gas from an inert gas supply source is coupled to the lower end of the inert gas supply pipe 170.
- Examples of the inert gas guided to the inert gas supply path 172 include an inert gas such as CDA (clean air with low humidity) and nitrogen gas.
- CDA clean air with low humidity
- nitrogen gas nitrogen gas.
- an inert gas valve 173 and an inert gas flow rate adjustment valve 174 are interposed in the middle of the inert gas supply path 172.
- the inert gas valve 173 opens and closes the inert gas supply path 172.
- the inert gas By opening the inert gas valve 173, the inert gas is fed into the inert gas supply pipe 170.
- This inert gas is supplied to a space between the protective disk 115 and the lower surface of the substrate W by a configuration described later.
- the protective gas supply unit 12 is configured by the inert gas supply pipe 170, the inert gas supply path 172, the inert gas valve 173, and the like.
- FIG. 3 is a plan view for explaining a more specific configuration of the spin chuck 5 provided in the substrate processing apparatus 1.
- FIG. 4 is a bottom view of the configuration of FIG.
- FIG. 5 is a cross-sectional view taken along section line VV in FIG. 6 is an enlarged cross-sectional view showing a part of the configuration of FIG.
- FIG. 7 is an enlarged cross-sectional view showing a configuration in the vicinity of the movable pin 112 provided in the spin chuck 5.
- FIG. 8 is a schematic cross-sectional view showing the configuration of the FOM nozzle 6.
- FIG. 9 is a schematic plan view for explaining the movement of the cleaning brush 10.
- the turntable 107 is formed in a disc shape along a horizontal plane, and is connected to a boss 109 connected to a rotation shaft 108.
- the plurality of holding pins 110 are arranged at equal intervals along the circumferential direction on the peripheral edge of the upper surface of the turntable 107.
- the holding pin 110 includes a fixed pin 111 that does not move with respect to the turntable 107 and a movable pin 112 that can move with respect to the turntable 107.
- the two holding pins 110 arranged adjacent to each other are the movable pins 112.
- the holding pin 110 includes a lower shaft portion 151 coupled to the turntable 107 and an upper shaft portion 152 formed integrally with the upper end of the lower shaft portion 151.
- the lower shaft portion 151 and the upper shaft portion 152 are each formed in a cylindrical shape.
- the upper shaft portion 152 is provided eccentric from the center axis of the lower shaft portion 151.
- the surface connecting the upper end of the lower shaft portion 151 and the lower end of the upper shaft portion 152 forms a tapered surface 153 that descends from the upper shaft portion 152 toward the peripheral surface of the lower shaft portion 151.
- the movable pin 112 is coupled to the turntable 107 so that the lower shaft portion 151 can rotate around the rotation axis 112a coaxial with the center axis. More specifically, a support shaft 155 that is supported by a rotary table 107 via a bearing 154 is provided at the lower end portion of the lower shaft portion 151. A magnet holding member 157 holding a pin driving permanent magnet 156 is coupled to the lower end of the support shaft 155. The pin driving permanent magnet 156 is disposed, for example, with the magnetic pole direction oriented in a direction orthogonal to the rotation axis 112 a of the movable pin 112.
- the protective disk 115 is a substantially disk-shaped member having the same size as the substrate W.
- a cutout 116 is formed in the outer peripheral portion of the protection disk 115 at a position corresponding to the holding pin 110 so as to border the holding pin 110 with a certain distance from the outer peripheral surface of the holding pin 110.
- a circular opening corresponding to the boss 109 is formed in the central region of the protection disk 115.
- a guide shaft 117 extending in the vertical direction in parallel to the rotation axis A1 is coupled to the lower surface of the protective disk 115 at a position farther from the rotation axis A1 than the boss 109.
- the guide shaft 117 is disposed at three locations that are equally spaced in the circumferential direction of the protective disk 115. More specifically, three guide shafts 117 are arranged at angular positions corresponding to every other holding pin 110 as viewed from the rotation axis A1.
- the guide shaft 117 is coupled to a linear bearing 118 provided at a corresponding portion of the turntable 107, and is movable in the vertical direction, that is, in a direction parallel to the rotation axis A1 while being guided by the linear bearing 118. Therefore, the guide shaft 117 and the linear bearing 118 constitute a guide unit 119 that guides the protective disk 115 along the vertical direction parallel to the rotation axis A1.
- the guide shaft 117 penetrates the linear bearing 118 and has a flange 120 protruding outward at the lower end thereof.
- the flange 120 abuts on the lower end of the linear bearing 118, the upward movement of the guide shaft 117, that is, the upward movement of the protective disk 115 is restricted. That is, the flange 120 is a regulating member that regulates the upward movement of the protective disk.
- a magnet holding member 161 holding the protective disk side permanent magnet 160 is protected at an outer position farther from the rotation axis A1 than the guide shaft 117 and closer to the rotation axis A1 than the holding pin 110. It is fixed to the lower surface of the disk 115.
- the protective disk side permanent magnet 160 is held by the magnet holding member 161 with the magnetic pole direction directed in the vertical direction.
- the protective disk side permanent magnet 160 may be fixed to the magnet holding member 161 so as to have an S pole on the lower side and an N pole on the upper side.
- the magnet holding members 161 are provided at six locations at equal intervals in the circumferential direction.
- each magnet holding member 161 is arranged at an angular position corresponding to between the holding pins 110 adjacent to each other (in the present embodiment) as viewed from the rotation axis A1. Further, among the six angular regions divided (equally divided in this embodiment) by the six magnet holding members 161 as viewed from the rotation axis A1, within every other angular region (in this embodiment, in the angular region). Three guide shafts 117 are arranged at the center position).
- through-holes 162 are formed in the turntable 107 at six locations corresponding to the six magnet holding members 161.
- Each through hole 162 is formed so that the corresponding magnet holding member 161 can be inserted in a vertical direction parallel to the rotation axis A1.
- the magnet holding member 161 is inserted through the through hole 162 and protrudes downward from the lower surface of the turntable 107, and the protection disk side permanent magnet 160 is lower than the lower surface of the turntable 107. Located below.
- an elevating permanent magnet 125 is disposed below the turntable 107.
- a magnet lifting / lowering unit 126 that lifts and lowers the lifting / lowering permanent magnet 125 is connected to the lifting / lowering permanent magnet 125.
- the magnet lifting / lowering unit 126 includes, for example, a cylinder that can be expanded and contracted in the vertical direction, and is supported by the cylinder.
- the elevating permanent magnet 125 is formed in an annular shape coaxial with the rotation axis A1, and is disposed along a plane (horizontal plane) orthogonal to the rotation axis A1. More specifically, the elevating permanent magnet 125 is disposed at a position farther from the protective disk side permanent magnet 160 and closer to the pin driving permanent magnet 156 with respect to the rotation axis A1. That is, in a plan view, the annular elevating permanent magnet 125 is located between the protective disk side permanent magnet 160 and the pin driving permanent magnet 156. Further, the elevating permanent magnet 125 is arranged at a position lower than the protective disk side permanent magnet 160.
- the magnetic pole direction of the elevating permanent magnet 125 is in the horizontal direction, that is, the rotational radius direction of the turntable 107.
- the elevating permanent magnet 125 is configured to have the same magnetic pole, that is, the south pole in a ring shape inward in the rotational radius direction.
- the elevating permanent magnet 125 In the state where the elevating permanent magnet 125 is disposed at the upper position (see FIG. 12B) where the ring-shaped magnetic pole is horizontally opposed to the pin driving permanent magnet 156, the elevating permanent magnet 125 and the pin driving permanent magnet 156 are arranged.
- the movable pin 112 is driven to the holding position and held at the holding position by the magnetic force acting between the two.
- the movable pin 112 has an upper shaft portion 152 at a position eccentric from the rotation axis 112a (see FIG. 7). Therefore, due to the rotation of the lower shaft portion 151, the upper shaft portion 152 is displaced between a distant open position away from the rotation axis A1 and a holding position approaching the rotation axis A1.
- the upper shaft portion 152 of the movable pin 112 is biased to the open position by the elastic pressing force of an elastic pressing member (not shown) such as a spring. Therefore, when the pin driving permanent magnet 156 does not receive the attractive magnetic force from the elevating permanent magnet 125, the movable pin 112 is located at an open position away from the rotation axis A1.
- the pin driving permanent magnet 156 moves to the holding position where the upper shaft portion 152 approaches the rotation axis A1 when receiving the attractive magnetic force (the magnetic force exceeding the elastic pressing force by the elastic pressing member) from the elevating permanent magnet 125.
- the elevating permanent magnet 125 is formed in an annular shape coaxial with the rotation axis A1, the elevating permanent magnet 125 does not depend on the rotation position of the movable pin 112 around the rotation axis A1, that is, even if the rotary table 107 is rotating.
- the attractive magnetic force between the magnet 125 and the pin driving permanent magnet 156 is held, whereby the movable pin 112 is held at a holding position for holding the substrate W.
- the elevating permanent magnet 125 when the elevating permanent magnet 125 is in the upper position (see FIG. 12B), a repulsive magnetic force acts between the elevating permanent magnet 125 and the protective disk side permanent magnet 160, and the protective disk side permanent magnet 160 applies an upward external force. receive.
- the protective disk 115 receives an upward force from the magnet holding member 161 holding the protective disk side permanent magnet 160 and is held at a processing position close to the lower surface of the substrate W.
- the elevating permanent magnet 125 In a state where the elevating permanent magnet 125 is disposed at a lower position (see FIG. 12A, etc.) that is spaced downward from the upper position (see FIG. 12B), the repulsive magnetic force between the elevating permanent magnet 125 and the protective disk side permanent magnet 160 is Therefore, the protection disk 115 is held at a lower position near the upper surface of the turntable 107 by its own weight. Further, since the elevating permanent magnet 125 does not face the pin driving permanent magnet 156, the movable pin 112 is not subjected to an external force that urges the movable pin 112 to its holding position.
- the center robot CR that carries the substrate W in and out of the spin chuck 5 can cause the hand H2 to enter the space between the protective disk 115 and the lower surface of the substrate W.
- the protective disk-side permanent magnet 160, the elevating permanent magnet 125, and the magnet elevating unit 126 are caused to lift the protective disk 115 upward from the surface of the turntable 107 by the repulsive force between the permanent magnets 125, 160.
- the magnetic levitation unit 141 leading to is constructed.
- the pin driving permanent magnet 156, the elevating permanent magnet 125, and the magnet elevating unit 126 constitute a magnetic driving unit 142 that holds the movable pin 112 in its holding position by the magnetic force between the permanent magnets 125 and 156. ing.
- the magnetic levitation unit 141 and the magnetic drive unit 142 share the elevating permanent magnet 125 and the magnet elevating unit 126.
- the protective disk 115 is held in the approach position by the magnetic repulsive force between the elevating permanent magnet 125 and the protective disk side permanent magnet 160, and the elevating permanent magnet 125 and the pin
- the movable pin 112 is held at the holding position by the magnetic attraction force with the driving permanent magnet 156.
- the boss 109 coupled to the upper end of the rotary shaft 108 holds a bearing unit 175 for supporting the upper end portion of the inert gas supply pipe 170.
- the bearing unit 175 includes a spacer 177 fitted and fixed in a recess 176 formed in the boss 109, a bearing 178 disposed between the spacer 177 and the inert gas supply pipe 170, and the spacer 177.
- a magnetic fluid bearing 179 provided above the bearing 178 between the active gas supply pipe 170 and the active gas supply pipe 170 is provided.
- the boss 109 integrally has a flange 181 protruding outward along a horizontal plane, and the turntable 107 is coupled to the flange 181. Further, the above-mentioned spacer 177 is fixed to the flange 181 so as to sandwich the inner peripheral edge of the turntable 107, and the cover 184 is coupled to the spacer 177.
- the cover 184 is formed in a substantially disk shape, and has an opening for exposing the upper end of the inert gas supply pipe 170 at the center, and a recess 185 having the opening as a bottom surface is formed on the upper surface thereof. .
- the recess 185 has a horizontal bottom surface and an inverted conical inclined surface 183 that rises obliquely upward from the periphery of the bottom surface outward.
- a rectifying member 186 is coupled to the bottom surface of the recess 185.
- the rectifying member 186 has a plurality of (for example, four) leg portions 187 that are discretely arranged at intervals along the circumferential direction around the rotation axis A ⁇ b> 1, and the leg portions 187 define the recesses 185. It has a bottom surface 188 that is spaced from the bottom surface.
- An inclined surface 189 made of an inverted conical surface extending obliquely upward toward the outside from the peripheral edge of the bottom surface 188 is formed.
- a flange 184 a is formed outwardly on the outer periphery of the upper surface of the cover 184.
- the flange 184a is aligned with a step portion 115a formed on the inner peripheral edge of the protective disk 115. That is, when the protective disk 115 is in an approach position close to the lower surface of the substrate W, the flange 184a and the stepped portion 115a are combined, and the upper surface of the cover 184 and the upper surface of the protective disk 115 are located in the same plane and are flat. An inert gas flow path is formed.
- the inert gas flowing out from the upper end of the inert gas supply pipe 170 exits into the space defined by the bottom surface 188 of the rectifying member 186 in the recess 185 of the cover 184.
- This inert gas is further blown out in the radial direction away from the rotation axis A1 through the radial flow path 182 defined by the inclined surface 183 of the recess 185 and the inclined surface 189 of the rectifying member 186. become.
- This inert gas forms an air flow of inert gas in a space between the protective disk 115 and the lower surface of the substrate W held by the holding pins 110, and the substrate W is directed outward in the rotational radius direction from the space. Blow out.
- the cover 191 includes an annular plate portion 192 that protrudes in the horizontal direction from the outer peripheral portion of the upper surface in the radial direction and a cylindrical portion 193 that hangs down from the peripheral end of the annular plate portion 192.
- the outer periphery of the annular plate portion 192 is located outward from the peripheral end of the turntable 107.
- the annular plate portion 192 and the cylindrical portion 193 are integrally formed using, for example, a resin material having chemical resistance.
- a cutout 194 for avoiding the holding pin 110 is formed at a position corresponding to the holding pin 110 on the inner periphery of the annular plate portion 192.
- the notch 194 is formed so as to border the holding pin 110 with a certain distance from the outer peripheral surface of the holding pin 110.
- the annular plate portion 192 and the cylindrical portion 193 are integrally formed using, for example, a resin material having chemical resistance.
- the annular plate portion 192 of the cover 191 has a throttle portion 190 (see FIG. 13) for restricting the flow path of the inert gas at the outer peripheral portion of the substrate W held by the holding pins 110 on the upper surface.
- These throttle portions 190 increase the flow velocity of the inert gas flow blown outward from the space between the cover 191 and the lower surface (front surface Wa) of the substrate W, so that the upper surface (back surface Wb) of the substrate W is increased. It is possible to reliably avoid or suppress the processing liquid (FOM) from entering the lower surface (front surface Wa) side of the substrate W.
- the FOM nozzle 6 is, for example, a straight nozzle that selectively discharges FOM and ozone water in a continuous flow state, and a vertical posture that discharges the processing liquid in a direction perpendicular to the upper surface of the substrate W. Thus, it is attached to the tip of the nozzle arm 21 extending in the horizontal direction.
- the FOM nozzle 6 discharges FOM or ozone water in a discharge direction inclined with respect to the upper surface of the substrate W so that the FOM or ozone water is deposited inward (rotation axis A1 side) from the discharge port.
- the top surface of the substrate W may be held by the nozzle arm 21 in an inwardly directed posture, or so that FOM or ozone water is deposited outside the discharge port (on the opposite side to the rotation axis A1).
- the nozzle arm 21 may hold the FOM or ozone water in an outward posture that is inclined with respect to the discharge direction.
- a nozzle moving unit 22 is coupled to the nozzle arm 21.
- the nozzle moving unit 22 moves the FOM nozzle 6 horizontally along a trajectory passing through the central portion of the upper surface of the substrate W in plan view by rotating the nozzle arm 21 around an oscillation axis (not shown).
- the nozzle moving unit 22 includes a processing position where the FOM or ozone water discharged from the FOM nozzle 6 lands on the upper surface of the substrate W, and a home position where the FOM nozzle 6 is set around the spin chuck 5 in plan view. In the meantime, the FOM nozzle 6 is moved horizontally.
- the nozzle moving unit 22 includes a central position where the FOM or ozone water discharged from the FOM nozzle 6 is deposited on the center of the upper surface of the substrate W, and the FOM or ozone water discharged from the FOM nozzle 6 is the substrate W.
- the FOM nozzle 6 is moved horizontally between the peripheral position where the liquid is deposited on the outer periphery of the upper surface.
- the center position and the peripheral position are both processing positions.
- the FOM supply device 7 is connected to the FOM nozzle 6 and includes a hydrofluoric acid pipe 23 to which dilute hydrofluoric acid from a dilute hydrofluoric acid supply source (not shown) is supplied, and an ozone water supply source (for example, an ozone generator). And an ozone water pipe 24 to which ozone water from (not shown) is supplied.
- a hydrofluoric acid valve 25 for opening and closing the hydrofluoric acid pipe 23 and a hydrofluoric acid flow rate adjusting valve 26 are interposed.
- the hydrofluoric acid valve 25 is opened and closed under the control of the control device 3.
- the hydrofluoric acid flow rate adjustment valve 26 includes a valve body having a valve seat therein, a valve body that opens and closes the valve seat, and an actuator that moves the valve body between an open position and a closed position. including. The same applies to other flow rate adjusting valves.
- an ozone water valve 27 for opening and closing the ozone water pipe 24, and an ozone water flow rate for adjusting the flow rate of the ozone water pipe 24 by adjusting the opening of the ozone water pipe 24.
- An adjustment valve 28 is interposed. Ozone water is supplied to the FOM nozzle 6 through the ozone water pipe 24.
- the FOM nozzle 6 includes a casing 31 having a substantially cylindrical shape.
- the FOM nozzle 6 is attached to the nozzle arm 21 (see FIG. 2) in a vertical posture in which the central axis of the casing 31 extends in the vertical direction.
- the casing 31 includes a first cylindrical portion 38 and a cylindrical second cylindrical portion 39 having a smaller diameter than the first cylindrical portion 38 and coaxial with the first cylindrical portion 38. Since the second cylindrical portion 39 has a smaller diameter than the first cylindrical portion 38, the flow path cross section inside the second cylindrical portion 39 has a smaller area than the flow path cross section of the first cylindrical portion 38. is there.
- the first cylindrical portion 38 and the second cylindrical portion 39 have inner walls along the vertical direction.
- a lower portion of the first cylindrical portion 38 of the casing 31 is formed with a hydrofluoric acid inlet 32 for introducing dilute hydrofluoric acid and an ozone water inlet 33 for introducing ozone water.
- the positional relationship between the hydrofluoric acid introduction port 32 and the ozone water introduction port 33 may be such that the hydrofluoric acid introduction port 32 is disposed above the ozone water introduction port 33 as shown in FIG. May be.
- dilute hydrofluoric acid from the hydrofluoric acid pipe 23 is supplied from the hydrofluoric acid inlet 32 to the mixing chamber 35.
- the ozone water from the ozone water pipe 24 is supplied from the ozone water inlet 33 to the mixing chamber 35.
- the diluted hydrofluoric acid and ozone water that have flowed into the mixing chamber 35 are sufficiently mixed (stirred) in the lower portion of the mixing chamber 35.
- a discharge port 37 for discharging the generated FOM toward the external space 36 is provided at the tip (lower end) of the second cylindrical portion 39 of the casing 31.
- the FOM generated in the mixing chamber 35 passes through the inside of the second cylindrical portion 39 and is discharged from the discharge port 37. Thereby, FOM can be discharged from the FOM nozzle 6 with a simple configuration.
- the ozone-containing hydrofluoric acid solution immediately after mixing can be discharged from the FOM nozzle 6.
- the ozone dissolved in the hydrofluoric acid solution starts to be decomposed immediately after dissolution, but since the FOM immediately after mixing (immediately after generation) can be discharged from the FOM nozzle 6, the FOM in which ozone decomposition has not progressed is applied to the substrate W. Can supply.
- the water supply unit 8 includes a water nozzle 41.
- the water nozzle 41 is, for example, a straight nozzle that discharges liquid in a continuous flow state, and is fixedly disposed above the spin chuck 5 with its discharge port directed toward the center of the upper surface of the substrate W.
- a water pipe 42 to which water from a water supply source is supplied is connected to the water nozzle 41.
- a water valve 43 for switching supply / stop of water from the water nozzle 41 is interposed in the middle of the water pipe 42. When the water valve 43 is opened, the continuous flow of water supplied from the water pipe 42 to the water nozzle 41 is discharged from the discharge port set at the lower end of the water nozzle 41.
- the water is, for example, deionized water (DIW). Not only DIW but also carbonated water, electrolytic ionic water, hydrogen water, ozone water, and diluted hydrochloric acid water (for example, about 10 ppm to 100 ppm) may be used.
- DIW deionized water
- carbonated water electrolytic ionic water
- hydrogen water hydrogen water
- ozone water diluted hydrochloric acid water (for example, about 10 ppm to 100 ppm) may be used.
- Each of the water nozzles 41 does not have to be fixedly arranged with respect to the spin chuck 5.
- the water nozzle 41 is attached to an arm that can swing in a horizontal plane above the spin chuck 5.
- a so-called scan nozzle may be employed in which the liquid landing position on the upper surface of the substrate W is scanned by rocking.
- the cleaning brush 10 is a sponge-like scrub member made of, for example, PVA (polyvinyl alcohol), and has a cylindrical shape.
- the cleaning brush 10 has a flat cleaning surface 10a on its lower surface.
- the cleaning surface 10 a functions as a contact surface that contacts the upper surface of the substrate W.
- the cleaning brush drive unit 11 includes a swing arm 47 that holds the cleaning brush 10 at the tip, and an arm drive unit 48 that drives the swing arm 47.
- the arm drive unit 48 is configured so that the swing arm 47 can swing around the swing axis A2 extending in the vertical direction, and the swing arm 47 can be moved up and down. With this configuration, when the substrate W is held and rotated by the spin chuck 5, the cleaning brush 10 is moved between a position above the substrate W and a home position set to the side of the spin chuck 5. It can be moved horizontally.
- the cleaning surface 10a of the cleaning brush 10 is pressed against the upper surface (back surface Wb) of the substrate W, and the pressing position of the cleaning brush 10 is as shown in FIG. ) And the outer periphery of the substrate W (indicated by a two-dot chain line in FIG. 9), the substrate W can be moved (scanned) in the radial direction.
- water for example, deionized water (deionized water)
- deionized water deionized water
- FIG. 10 is a block diagram for explaining the electrical configuration of the main part of the substrate processing apparatus 1.
- the control device 3 controls the operation of the rotation drive unit 103, the nozzle movement unit 22, the arm drive unit 48, the magnet lifting / lowering unit 126, and the like according to a predetermined program. Further, the control device 3 opens and closes the hydrofluoric acid valve 25, the hydrofluoric acid flow rate adjustment valve 26, the ozone water valve 27, the ozone water flow rate adjustment valve 28, the water valve 43, the inert gas valve 173, the inert gas flow rate adjustment valve 174, and the like. Control the operation.
- FIG. 11 is a flowchart for explaining an example of the cleaning process executed by the processing unit 2.
- 12A to 12F are schematic diagrams for explaining a processing example of the cleaning process.
- FIG. 13 is a cross-sectional view showing the flow of FOM and inert gas in the outer periphery of the substrate W.
- the outer peripheral portion of the back surface Wb of the substrate W is an annular region having a width of about 10 mm along the periphery of the substrate W, for example, on the back surface Wb of the substrate W having a diameter of 300 mm.
- the processing unit 2 is targeted for cleaning, for example, a substrate W (hereinafter sometimes referred to as an “uncleaned substrate”) W that has been processed by a preprocessing apparatus such as an annealing apparatus or a film forming apparatus.
- a substrate W (hereinafter sometimes referred to as an “uncleaned substrate”) W that has been processed by a preprocessing apparatus such as an annealing apparatus or a film forming apparatus.
- An example of the substrate W is a circular silicon substrate.
- the substrate W may be a large substrate (for example, a circular substrate having an outer diameter of 300 (mm)).
- the processing unit 2 is a single wafer cleaning processing unit for cleaning the back surface Wb (one main surface, device non-forming surface) opposite to the front surface Wa (the other main surface, device forming surface) of the substrate W. .
- the back surface Wb of the substrate W carried into the processing unit 2 is a bare silicon surface of the silicon substrate W.
- the silicon target surface may include at least one of polysilicon and amorphous silicon.
- a chuck mark for example, a chuck mark by an electrostatic chuck
- the chuck marks include scratches such as chips and dents on the back surface Wb of the substrate W, partial peeling of the back surface Wb, and the like. This chuck mark is formed over the entire back surface Wb of the substrate W.
- the processing unit 2 removes the chuck marks formed on the back surface Wb of the substrate W by cleaning. This cleaning process is not intended to completely remove the chuck marks from the back surface Wb of the substrate W, and most of the chuck marks are removed from the back surface Wb of the substrate W (roughly removing the chuck marks). Is the purpose.
- the metal layer M is formed on the surface Wa of the substrate W.
- the metal layer M includes at least one of Cu, TiN, W, and Al. Since the metal layer M is formed on the surface Wa of the substrate W, water cannot be supplied to the surface Wa of the substrate W. Therefore, the surface Wa of the substrate W is protected by a protective liquid such as water during the chemical treatment for treating the back surface Wb of the substrate W (for example, the ozone-containing hydrofluoric acid solution supply step (hereinafter referred to as “FOM supply step”) T6). Cannot do (cannot cover rinse).
- FOM supply step ozone-containing hydrofluoric acid solution supply step
- the carrier C in which the uncleaned substrate W is accommodated is transferred from the pretreatment apparatus to the substrate treatment apparatus 1 and placed on the load port LP.
- the carrier C accommodates the substrate W with the surface Wa of the substrate W facing up.
- the control device 3 causes the indexer robot IR to transfer the substrate W from the carrier C to the reversing unit TU with the surface Wa facing upward.
- the control apparatus 3 reverses the conveyed board
- the control device 3 takes out the substrate W from the reversing unit TU with the hand H2 of the center robot CR, and carries it into the processing unit 2 with its back surface Wb facing upward (step T2).
- the uncleaned substrate W carried into the processing unit 2 is delivered to the spin chuck 5, and as shown in FIG. 12A, the substrate W has its surface Wa facing downward and its back surface Wb facing upward. In this state, it is placed on the spin chuck 5.
- the FOM nozzle 6 Prior to the loading of the substrate W, the FOM nozzle 6 is retracted to the home position set on the side of the spin chuck 5.
- the cleaning brush 10 is also retracted to the home position set on the side of the spin chuck 5.
- the elevating permanent magnet 125 is disposed at the lower position, and therefore, the elevating permanent magnet 125 is greatly separated downward from the rotary table 107, so that the repulsion acting between the elevating permanent magnet 125 and the protective disk side permanent magnet 160. Magnetic force is small. Therefore, the protective disk 115 is located at a lower position close to the upper surface of the turntable 107.
- the hand H2 of the center robot CR transports the substrate W to above the spin chuck 5 while holding the substrate W at a position higher than the upper end of the holding pin 110. Thereafter, the hand H2 of the center robot CR descends toward the upper surface of the turntable 107. In the process, the substrate W is transferred from the hand H2 of the center robot CR to the holding pin 110. The hand H2 of the center robot CR descends to a space between the surface Wa (lower surface) of the substrate W and the protective disk 115, and then retracts to the side of the spin chuck 5 through the holding pins 110. Go.
- the control device 3 controls the magnet lifting / lowering unit 126 to raise the lifting / lowering permanent magnet 125 to the upper position (step T3).
- the elevating permanent magnet 125 rises to the upper position, the elevating permanent magnet 125 approaches the protective disk side permanent magnet 160 from below, and the distance between the permanent magnets 125 and 160 is reduced. The repulsive magnetic force acting between them increases. Due to the repulsive magnetic force, the protective disk 115 floats from the upper surface of the turntable 107 toward the substrate W.
- the protective disk 115 reaches the approach position where the protective disk 115 approaches the front surface Wa (lower surface) of the substrate W with a small gap, and the flange formed at the lower end of the guide shaft 117 120 abuts on the linear bearing 118.
- the protection disk 115 is held at the approach position.
- the movable pin 112 is driven from the open position to the holding position and is held at the holding position.
- the substrate W is gripped by the fixed pin 111 and the movable pin 112 (substrate holding step).
- the control device 3 opens the inert gas valve 173 and starts the supply of the inert gas as shown in FIG. 12B (T4: protective gas supply step).
- the supplied inert gas is discharged from the upper end of the inert gas supply pipe 170, and a narrow space between the protective disk 115 at the approach position and the surface Wa (lower surface) of the substrate W by the function of the rectifying member 186 and the like.
- the air is blown out radially about the rotation axis A1.
- the inert gas further flows between the narrowed portion 190 formed on the annular plate portion 192 of the cover 191 disposed on the peripheral portion of the protective disk 115 and the outer peripheral portion of the substrate W.
- the discharge flow rate of the inert gas from the upper end of the inert gas supply pipe 170 is set to a large flow rate (for example, 180 (liters / minute)).
- control device 3 controls the rotation drive unit 103 to start the rotation of the turntable 107, thereby rotating the substrate W around the rotation axis A1 as shown in FIG. 12C (step T5).
- the rotational speed of the substrate W is increased to a predetermined liquid processing speed (within 300 to 1500 rpm, for example, 500 rpm) and maintained at the liquid processing speed.
- the control device 3 After the rotation speed of the substrate W reaches the liquid processing speed, the control device 3 performs an FOM supply process (step T6) for supplying the FOM to the back surface Wb of the substrate W.
- the control device 3 controls the nozzle moving unit 22 to move the FOM nozzle 6 from the home position to the center position. As a result, the FOM nozzle 6 is disposed above the central portion of the substrate W.
- the control device 3 opens the hydrofluoric acid valve 25 and the water valve 43 simultaneously.
- dilute hydrofluoric acid flowing through the hydrofluoric acid pipe 23 is supplied to the FOM nozzle 6, and ozone water flowing through the ozone water pipe 24 is supplied to the FOM nozzle 6. Then, dilute hydrofluoric acid and ozone water are mixed in the casing of the FOM nozzle 6 to generate FOM.
- the FOM is discharged from the discharge port of the FOM nozzle 6 and is deposited on the center of the back surface Wb of the substrate W as shown in FIG. 12C.
- the FOM supplied to the central portion of the back surface Wb of the substrate W receives a centrifugal force due to the rotation of the substrate W and spreads radially toward the outer peripheral portion of the back surface Wb of the substrate W.
- the FOM can be distributed over the entire back surface Wb of the substrate W.
- hydrofluoric acid and ozone can be distributed over the entire back surface Wb of the substrate W.
- the FOM liquid film LF ⁇ b> 2 that covers the entire back surface Wb of the substrate W is formed on the substrate W.
- a silicon oxide film is formed on the back surface Wb of the substrate W, which is a silicon substrate, due to the oxidizing action of ozone contained in the FOM. Further, the silicon oxide film formed on the back surface Wb of the substrate W is peeled off (lifted off) from the back surface Wb by the oxide film etching action of hydrofluoric acid contained in the FOM. Thereby, scratches (chips, dents, etc.) formed on the back surface Wb of the substrate W are removed. In addition, foreign matters (particles, impurities, peeling of the back surface Wb of the substrate W, etc.) are also removed from the back surface Wb of the substrate W. That is, the back surface Wb of the substrate W can be cleaned.
- the amount of silicon oxide film formed on the back surface Wb of the substrate W can be increased as compared with the case where SC1 is used as the cleaning chemical, and thus high etching performance. Demonstrate (foreign matter removal performance).
- the running cost of ozone water contained in FOM is lower than that of hydrogen peroxide contained in SC1. Thereby, the cost required for the cleaning process can be reduced.
- the surface Wa of the substrate W is protected by an inert gas (protective gas). Since the discharge flow rate of the inert gas from the inert gas supply pipe 170 is set to a large flow rate as described above, the flow rate of the FOM supplied from the inert gas supply pipe 170 to the back surface Wb of the substrate W is small. In the case of the flow rate, the FOM does not wrap around the surface Wa of the substrate W.
- the FOM supply flow rate in the FOM supply step (T6) is preferably 0.5 (liter / minute) or more and 1.0 (liter / minute) or less. In this case, the FOM can be prevented from wrapping around the surface Wa of the substrate W. Further, the discharge flow rate is more preferably 0.8 (liters / minute) or less, and in this case, the FOM can be more reliably prevented from wrapping around the surface Wa of the substrate W.
- the hydrofluoric acid concentration of the FOM discharged from the FOM nozzle 6 is 0.093 wt. % Or more 0.221 wt. % Or less. More preferably, 0.093 wt. % Or more 0.221 wt. % Or less.
- the ozone concentration of the FOM discharged from the FOM nozzle 6 is 22.5 ppm or more and 67.2 ppm or less. More preferably, it is 22.5 ppm or more and 42.0 ppm or less. If the ozone concentration exceeds 42.0 ppm, the FOM contains a large amount of bubbles, which is not suitable for substrate processing. Moreover, when the ozone concentration of FOM exceeds 42.0 ppm, there is a possibility that ozone may be exposed from the ozone water pipe 24 through the wall of the ozone water pipe 24 made of PFA pipe. Furthermore, as the ozone concentration increases, the toxicity of ozone increases. It is not desirable from the viewpoint of safety that the ozone concentration of the discharged FOM exceeds 42.0 ppm.
- the back surface Wb of the substrate W when the back surface Wb of the substrate W is treated with a chemical solution containing hydrofluoric acid having a hydrophobic action, the back surface Wb of the substrate W may be hydrophobized by the action of hydrofluoric acid contained in the chemical solution.
- the discharge flow rate of FOM and Depending on the ozone concentration of FOM, ozone may not reach the outer periphery of the back surface Wb of the substrate W during the FOM supply step (T6).
- the outer peripheral portion of the back surface Wb of the substrate W may be hydrophobic due to the hydrofluoric acid that has reached the outer peripheral portion of the back surface Wb of the substrate W.
- the hydrofluoric acid concentration of the FOM supplied to the back surface Wb of the substrate W is high, the outer periphery of the back surface Wb of the substrate W is hydrophobic because the hydrofluoric acid reaches only the outer periphery of the back surface Wb of the substrate W. The possibility of presenting becomes high.
- the back surface Wb of the substrate W is protected not by the protective liquid but by the protective gas. Therefore, in the FOM supply step (T6), the FOM is prevented from entering the front surface Wa side of the substrate W. There is a restriction (upper limit) on the supply flow rate. In such a situation where the supply flow rate of FOM is limited, there is a high possibility that the outer peripheral portion of the back surface Wb of the substrate W exhibits hydrophobicity at the end of the FOM supply step (T6).
- step T6 When the predetermined FOM processing time has elapsed from the start of FOM ejection, the FOM supply process (T6) is completed. Subsequent to the end of the FOM supply step (T6), an ozone water supply step (step T7) for supplying ozone water to the substrate W is performed.
- the control device 3 closes only the hydrofluoric acid valve 25 while keeping the ozone water valve 27 open while the FOM nozzle 6 is disposed above the center of the back surface Wb of the substrate W. Thereby, only ozone water is supplied to the FOM nozzle 6.
- the ozone water supplied to the FOM nozzle 6 passes through the casing of the FOM nozzle 6 and is discharged from the discharge port of the FOM nozzle 6 as shown in FIG. 12D.
- the ozone water is deposited on the central portion of the back surface Wb of the substrate W rotating at the liquid processing speed. That is, the processing liquid discharged from the FOM nozzle 6 toward the center portion of the back surface Wb of the substrate W is switched from the FOM to the ozone water (center portion ozone water discharge step).
- the ozone water deposited on the center of the back surface Wb of the substrate W flows outward on the substrate W toward the periphery of the substrate W.
- the FOM on the substrate W is replaced with ozone water, and the entire back surface Wb of the substrate W is eventually covered with the ozone water liquid film LF4.
- ozone water is supplied to the whole area of the back surface Wb of the substrate W, and the whole area is hydrophilized.
- the hydrophobized region peripheral portion can be changed to hydrophilic.
- the ozone concentration of ozone water supplied to the back surface Wb of the substrate W is 50 ppm or more. Therefore, the entire area of the back surface Wb of the substrate W can be made hydrophilic. Further, in the ozone water supply step (T7), it is desirable that the discharge flow rate of the ozone water is as large as possible. However, in order to prevent the ozone water from flowing to the surface Wa side, for example, 0.8 (liter / min) The following is desirable.
- the outer peripheral portion of the back surface Wb of the substrate W may be hydrophobized.
- the outer peripheral portion of the hydrophobized back surface Wb can be hydrophilized.
- the control device 3 closes the ozone water valve 27 and stops discharge of ozone water from the FOM nozzle 6.
- the ozone water supply time is preferably 5 seconds or longer. In this case, the entire area (including the outer peripheral portion) of the back surface Wb of the substrate W can be made hydrophobic.
- the control device 3 moves the FOM nozzle 6 from the center position to the home position. As a result, the FOM nozzle 6 is retracted from above the substrate W.
- step T8 supply of water, which is a rinsing liquid, to the back surface Wb of the substrate W is started (step T8).
- the control device 3 opens the water valve 43 and discharges water from the water nozzle 41 toward the center of the back surface Wb of the substrate W.
- the water discharged from the water nozzle 41 is deposited on the central portion of the back surface Wb of the substrate W covered with ozone water.
- the water that has landed on the central portion of the back surface Wb of the substrate W receives centrifugal force due to the rotation of the substrate W and flows on the back surface Wb of the substrate W toward the outer peripheral portion of the substrate W. And spread. Therefore, the ozone water on the substrate W is swept away by the water and discharged around the substrate W. Thereby, the liquid film LF4 of ozone water on the substrate W is replaced with the liquid film LF3 of water covering the entire back surface Wb of the substrate W.
- the control device 3 drives the arm.
- the unit 48 is controlled to perform scrub cleaning of the back surface Wb of the substrate W with the cleaning brush 10 as shown in FIG. 12F (T9: brush cleaning process). Thereby, scrub cleaning with the cleaning brush 10 is performed on the back surface Wb of the substrate W while supplying water.
- the control device 3 controls the arm drive unit 48 to swing the swing arm 47 around the swing axis A2 so that the cleaning brush 10 is disposed above the substrate W from the home position.
- the cleaning brush 10 is lowered and the cleaning surface 10a of the cleaning brush 10 is pressed against the back surface Wb of the substrate W.
- the control device 3 controls the arm drive unit 48 to set the pressing position of the cleaning brush 10 to the central portion of the substrate W (the position indicated by the solid line in FIG. 9) and the outer peripheral portion of the substrate W (see FIG. 9). (Indicated by a two-dot chain line). Accordingly, the pressing position of the cleaning brush 10 scans the entire area of the back surface Wb of the substrate W, and the entire area of the back surface Wb of the substrate W is scrubbed by the cleaning brush 10.
- the forward movement of the cleaning brush 10 from the central portion of the substrate W to the outer peripheral portion takes, for example, 6.5 seconds.
- the foreign matter peeled off in the FOM supply step (T6) is scraped off by scrubbing with the cleaning brush 10. And the foreign material scraped off with the washing brush 10 is washed away with water. Thereby, the separated foreign matter can be removed from the back surface Wb of the substrate W.
- the discharge flow rate of water supplied to the back surface Wb of the substrate W in the rinsing process (T8, T9) is preferably as large as possible. To prevent the water from flowing into the surface Wa side, for example, 0 .8 (liter / minute) or less is desirable.
- the scan width of the swing arm 47 is set so that the cleaning brush 10 can clean the position very close to the periphery of the substrate W.
- the ozone water supply step (T7) is executed prior to the brush cleaning step (T9). Therefore, at the start of the brush cleaning process (T9), the entire area of the back surface Wb of the substrate W is kept hydrophilic, whereby the back surface Wb of the substrate W via the cleaning brush 10 in the FOM supply process (T6). Re-adhesion of foreign matter does not occur.
- brush cleaning (scrub cleaning) can be performed on the back surface Wb of the substrate W while avoiding or suppressing reattachment of foreign matter to the front surface Wa of the substrate W.
- the control device 3 controls the arm drive unit 48 to return the cleaning brush 10 from the upper side of the spin chuck 5 to the home position. Further, the control device 3 closes the water valve 43 and stops the discharge of water from the water nozzle 41. The control device 3 closes the protective liquid valve 45 and stops the discharge of the protective gas (inert gas) from the inert gas supply pipe 170. Thereby, the brush cleaning process (T9) is completed.
- the protective gas inert gas
- a spin dry process for drying the substrate W is performed.
- the control device 3 controls the rotational drive unit 17 so that the rotational speed is higher than the rotational speed from the FOM supply step (T6) to the brush cleaning step (T9) (for example, several thousand rpm).
- the substrate W is accelerated, and the substrate W is rotated at the drying rotation speed. Thereby, a large centrifugal force is applied to the liquid on the substrate W, and the liquid adhering to the substrate W is shaken off around the substrate W. In this way, the liquid is removed from the substrate W, and the substrate W is dried.
- the spin dry process is performed on the substrate W in a state where the process target surface of the substrate W (that is, the back surface Wb of the substrate W) is hydrophobic, water droplets are applied to the process target surface during the spin dry process. As a result, the substrate processing may be defective.
- the substrate W is spin-dried while the back surface Wb of the substrate W is hydrophilic.
- Step (T10) is performed. Thereby, generation
- control device 3 controls the rotation drive unit 17 to stop the rotation of the substrate W by the spin chuck 5 (step T11).
- control apparatus 3 lowers the raising / lowering permanent magnet 125 to a downward position by controlling the magnet raising / lowering unit 126 (step T12).
- the distance between the raising / lowering permanent magnet 125 and the protection disk side permanent magnet 160 spreads, and the magnetic repulsive force between them decreases.
- the protective disk 115 is lowered toward the upper surface of the turntable 107.
- a space that allows the hand H2 of the center robot CR to enter is secured between the upper surface of the protection disk 115 and the surface Wa (lower surface) of the substrate W.
- the elevating permanent magnet 125 does not face the pin driving permanent magnet 156, the external force for urging the movable pin 112 to the holding position is lost, and an elastic pressing force from an elastic pressing member (not shown) is received.
- the movable pin 112 is biased to the open position. Thereby, the holding of the substrate W is released.
- the substrate W is unloaded from the processing chamber 4 (step T13).
- the control device 3 controls the center robot CR in a state where all the nozzles and the like are retracted from above the spin chuck 5, and the hand H2 is moved to the protective disk 115 and the surface Wa (lower surface) of the substrate W. Enter the space secured between the two. Then, the hand H2 scoops the substrate W held on the holding pins 110, and then retracts to the side of the spin chuck 5. Thereby, the cleaned substrate W is carried out of the processing chamber 4.
- the control device 3 transports the cleaned substrate W to the reversing unit TU by the hand H2 of the center robot CR. And the control apparatus 3 reverses the conveyed board
- a post-processing apparatus such as an exposure apparatus.
- the ozone water supply step (T7) for supplying ozone water to the back surface Wb of the substrate W is executed prior to the start of the brush cleaning step (T9) after the FOM supply step (T6). Is done.
- FOM is supplied to the back surface Wb of the substrate W, and a silicon oxide film is formed on the back surface Wb of the substrate W, which is a silicon substrate, due to the oxidizing action of ozone contained in the FOM. Further, the silicon oxide film formed on the back surface Wb of the substrate W is peeled off (lifted off) from the back surface Wb by the oxide film etching action of hydrofluoric acid contained in the FOM. Thereby, foreign matters (particles, impurities, peeling of the back surface Wb of the substrate W, etc.) are removed from the back surface Wb of the substrate W, and scratches (chips, dents, etc.) formed on the back surface Wb of the substrate W are removed.
- I can do it. Since ozone having strong oxidizing power is used, a large amount of oxide film can be formed on the back surface Wb of the substrate W, and a large amount of oxide film can be peeled off from the back surface Wb of the substrate W. As a result, foreign matters and / or scratches on the back surface Wb of the substrate W can be efficiently removed.
- an ozone water supply process (T7) for supplying ozone water to the back surface Wb of the substrate W is executed prior to the start of the brush cleaning process (T9). Therefore, even if the outer peripheral portion of the back surface Wb of the substrate W exhibits hydrophobicity after the FOM supplying step (T6) is completed, the hydrophobicity can be obtained by performing the ozone water supplying step (T7) after the FOM supplying step (T6). It is possible to make the region exhibiting Therefore, at the start of the brush cleaning process (T9), the entire area of the back surface Wb of the substrate W is hydrophilic. Therefore, the brush cleaning process (T9) is performed in a state where the entire area of the back surface Wb of the substrate W is hydrophilized. It can be carried out. Thereby, the reattachment of the foreign material to the back surface Wb of the substrate W through the cleaning brush 10 can be prevented in the brush cleaning step (T9).
- the cleaning efficiency (cleaning rate) of the outer periphery of the back surface Wb of the substrate W may be reduced.
- the ozone water supply step (T7) the region once hydrophobized is oxidized by supplying ozone water to make the region hydrophilic.
- the treatment of the back surface Wb of the substrate W is performed. Not proceed. Therefore, in this series of cleaning processes, cleaning residue may occur on the outer periphery of the back surface Wb of the substrate W.
- this cleaning process is intended to remove most chuck marks from the back surface Wb of the substrate W (roughly remove the chuck marks). Even if there is a cleaning residue on the outer peripheral portion of Wb, there is no particular problem.
- the ozone concentration of ozone water supplied to the back surface Wb of the substrate W in the ozone water supply step (T7) is 50 ppm or more. Therefore, the entire area of the back surface Wb of the substrate W can be made hydrophilic. Accordingly, the brush cleaning process (T9) can be performed in a state where the entire back surface Wb of the substrate W is made hydrophilic.
- the FOM supply step (T6) and the brush cleaning step (T9) are not executed in parallel with each other, and after the FOM supplied to the substrate W is replaced with water, scrub cleaning using a cleaning brush is executed. The Therefore, it is possible to prevent the cleaning brush 10 from being corroded by hydrofluoric acid or ozone contained in the FOM, and thus the life of the cleaning brush 10 can be extended.
- Example 1 Bare silicon wafer (diameter 300 mm) W on which a chuck mark of electrostatic check was formed on a processing target surface (non-device forming surface) was adopted as a sample, and FOM was supplied to the processing target surface as a cleaning chemical.
- the processing target surface of the wafer W was subjected to processing equivalent to the cleaning processing shown in FIG.
- the hydrofluoric acid concentration of the FOM supplied to the processing target surface in the FOM supply step (T6) is 0.093 wt. %
- the ozone concentration of the FOM is 43.75 ppm
- the supply flow rate of the FOM is 0.8 (liters / minute).
- the ozone concentration of ozone water supplied to the surface to be treated in the ozone water supply step (T7) is 50 ppm, and the supply flow rate of the ozone water is 0.8 (liter / min).
- Sample 1 (No. 1 to Sample 3 (No. 3)) in FIG. 14 described below is a sample corresponding to Example 1.
- Example 2 Bare silicon wafer (diameter 300 mm) W having electrostatic check chuck marks formed on a processing target surface (non-device forming surface) was used as a sample, and FOM was supplied to the processing target surface as a cleaning chemical.
- the wafer W was subjected to a process in which the process of Step T7 was deleted from the cleaning process shown in FIG.
- the hydrofluoric acid concentration of the FOM supplied to the processing target surface in the FOM supply step (T6) is 0.093 wt. %
- the ozone concentration of the FOM is 50 ppm
- the supply flow rate of the FOM is 0.8 (liters / minute).
- Sample 4 (No. 4) to Sample 9 (No. 9) in FIG. 14 to be described below are samples corresponding to Example 2.
- Comparative Example Bare silicon wafer (diameter 300 mm) W on which a chuck mark of electrostatic check was formed on a processing target surface (non-device forming surface) was adopted as a sample, and SC1 was supplied as a cleaning chemical to the processing target surface.
- the process of step T7 was deleted from the cleaning process shown in FIG. 11, and a process using SC1 instead of FOM as a cleaning chemical was performed on the wafer W.
- Sample 10 (No. 10) and Sample 11 (No. 11) in FIG. 14 described below are samples corresponding to the comparative example.
- the removal rate is a value obtained by dividing the number of particles reduced from the processing target surface of the wafer W by the cleaning processing by the number of particles existing on the processing target surface before the cleaning processing. The result is shown in FIG.
- FIG. 14 shows that in the example using FOM as the cleaning chemical solution, the particle removal rate by the cleaning process is remarkably improved as compared with the comparative example using FOM as the cleaning chemical solution.
- ⁇ Second cleaning test> Further, the inventors of the present application believe that if an ozone water supply step (T7) is added, the generation of the outer peripheral mode can be suppressed, and as a result, the cleaning efficiency is improved. A second cleaning test was performed to verify it.
- the FOM supplied to the surface to be processed in the FOM supply step (T6) has a hydrofluoric acid concentration of 1.106 wt. % Dilute hydrofluoric acid and ozone water (volume ratio of hydrofluoric acid to water 1:50) are mixed at a ratio of 1: 7. The FOM hydrofluoric acid concentration at this time was 0.138 wt. %.
- the ozone concentration of the ozone water supplied to the surface to be treated is 50 ppm, and the supply flow rate of the ozone water is 0.7 (liters / minute). Also, the supply flow rate of water (DIW) in the brush cleaning step (T9) Is 500 (ml / min).
- the execution time of the ozone water supply step (T7) was varied between 2 seconds and 5 seconds, and the processing target surface of the wafer W after cleaning was visually observed.
- the ozone water supply step (T7) When the ozone water supply step (T7) is performed for 2 seconds, the outer peripheral mode has occurred on the processing target surface of the wafer W. On the other hand, when the execution period of the ozone water supply step (T7) was 5 seconds, the generation of the outer peripheral mode was not observed.
- the ozone water supply step (T7) has been described as being performed prior to the start of the brush cleaning step (T9) after the FOM supply step (T6), the ozone water supply step (T7) is performed as the brush cleaning step. It may be executed prior to the start of (T9).
- the cleaning brush 10 may be scrubbed on the back surface Wb of the substrate W while supplying ozone water.
- PTFE instead of PVA as the material of the cleaning brush 10. Since PTFE has resistance to ozone water, corrosion of the cleaning brush 10 by ozone water can be suppressed or prevented.
- the FOM supply step (T6) the configuration in which the FOM is deposited on the central portion of the back surface Wb of the substrate W has been described as an example, but in parallel with the execution of the FOM supply step (T6),
- the liquid deposition position of the FOM with respect to the back surface Wb may be moved between the central portion and the outer peripheral portion, and the liquid deposition position of the FOM may be scanned over the entire area of the back surface Wb of the substrate W.
- the pressing position of the cleaning brush 10 against the substrate W may be moved within the surface of the substrate W by moving the cleaning brush 10 without rotating the substrate W. Good.
- a hydrofluoric acid supply process for supplying hydrofluoric acid to the back surface Wb of the substrate W may be added before and / or after the FOM supply process (T6).
- the control device 3 can discharge ozone water from the discharge port 37 of the FOM nozzle 6 by closing only the hydrofluoric acid valve 25 while keeping the ozone water valve 27 open.
- hydrofluoric acid supply process a hydrofluoric acid supply process executed after the start of rotation of the substrate W (T5) and before the FOM supply process (T6) can be exemplified.
- hydrofluoric acid supply process executed after the FOM supply process (T6) and before the ozone water supply process (T7) can be exemplified.
- the hydrofluoric acid supply process is executed after the rotation start (T5) of the substrate W and before the FOM supply process (T6), and the ozone after the completion of the FOM supply process (T6).
- T5 rotation start
- T6 FOM supply process
- T7 ozone after the completion of the FOM supply process
- the silicon oxide film formed on the back surface Wb of the substrate W can be removed by the hydrofluoric acid supply process.
- the back surface Wb of the substrate W is hydrophobized by the execution of the hydrofluoric acid supply process, but the ozone water supply process (T7) is always executed after the hydrofluoric acid supply process.
- the back surface Wb of the substrate W is hydrophilized. Therefore, the scrub process by the cleaning brush 10 is not performed on the back surface Wb of the substrate W that has been hydrophobized, so that there is no possibility that foreign matters will reattach to the back surface Wb of the substrate W in the brush cleaning step (T9).
- the back surface Wb of the substrate W is not dried in a hydrophobic state, it is possible to suppress or prevent the occurrence of substrate processing defects in the spin dry process (T10).
- the FOM supply unit has been described as an example of a nozzle mixing type in which dilute hydrofluoric acid and ozone water are mixed inside the FOM nozzle 6, but on the upstream side of the FOM nozzle 6.
- a mixing section connected via a pipe may be provided, and a pipe mixing type in which dilute hydrofluoric acid and ozone water are mixed in the mixing section may be employed.
- the method is not limited to the method of generating FOM by mixing dilute hydrofluoric acid and ozone water, and FOM may be generated by directly dissolving ozone in dilute hydrofluoric acid.
- a dilute hydrofluoric acid nozzle that discharges dilute hydrofluoric acid and an ozone water nozzle that discharges ozone water are provided, and the dilute hydrofluoric acid from the dilute hydrofluoric acid nozzle and the ozone water from the ozone water nozzle are transferred to the back surface of the substrate W.
- the FOM may be generated by mixing on Wb.
- the FOM supply unit is also used as the ozone water supply unit.
- the ozone water supply unit may be provided separately from the FOM supply unit.
- an ozone water nozzle that discharges ozone water is provided separately from the FOM nozzle 6, and ozone water from the ozone water nozzle is supplied to the back surface Wb of the substrate W in the ozone water supply step (T7). Good.
- the ozone water nozzle is arranged so that the discharge port faces the outer peripheral portion of the back surface Wb of the substrate W, and in the ozone water supply step (T7), the ozone water nozzle is directed to the outer peripheral portion of the back surface Wb of the substrate W.
- the ozone water may be discharged (peripheral ozone water discharge step).
- the ozone water discharged toward the outer peripheral portion of the back surface Wb of the substrate W is supplied to the entire outer peripheral portion of the back surface Wb of the substrate W by the rotation of the substrate W.
- substrate W can be hydrophilized efficiently, and, thereby, the reattachment of the foreign material to the back surface Wb of the board
- the series of cleaning processes has been described as removing foreign substances on the back surface Wb of the substrate W, in particular, removing the chuck marks formed on the back surface Wb.
- the series of cleaning processes includes not only check marks but also film peeling. It may be intended to remove defects including fine scratches and the like.
- the processing target surface is the bare silicon surface of the substrate (silicon substrate) W
- the silicon target surface is not limited to the bare silicon surface, and includes either a silicon oxide film or a silicon nitride film. Also good.
- the processing target surface is the back surface (device non-forming surface) Wb of the substrate W
- the front surface (device forming surface) Wa of the substrate W may be the processing target surface.
- the processing target surface includes a silicon oxide film, a silicon nitride film, and a metal film (for example, titanium nitride).
- the series of cleaning processes is not limited to the removal of foreign substances, but aims to remove metals and impurities embedded in the film.
- the processing target surface is the upper surface of the substrate W
- the lower surface of the substrate W may be the processing target surface
- the substrate processing apparatus 1 is an apparatus which processes a disk-shaped semiconductor substrate
- the substrate processing apparatus 1 is an apparatus which processes polygonal substrates, such as a glass substrate for liquid crystal display devices. Also good.
- Substrate processing apparatus 2 Processing unit 3: Control device 4: Processing chamber 5: Spin chuck 6: FOM nozzle (ozone-containing hydrofluoric acid solution supply unit) 7: FOM supply device (ozone-containing hydrofluoric acid solution supply unit) 8: Water supply unit 10: Cleaning brush 10a: Cleaning surface 21: Nozzle arm 22: Nozzle moving unit 23: Hydrofluoric acid piping 24: Ozone water piping 25: Hydrofluoric acid valve 26: Hydrofluoric acid flow rate adjustment valve 27: Ozone water valve 28 : Ozone water flow rate adjustment valve 47: Swing arm 48: Arm drive unit 103: Rotation drive unit 107: Rotating table 110: Holding pin 111: Fixed pin 112: Movable pin 115: Protection disk 170: Inert gas supply pipe 172: Inert gas supply path 173: Inert gas valve 174: Inert gas flow rate adjusting valve 190: Throttle portion 191: Cover 192: Ring plate portion 193: Cylindrical portion M: Metal layer W:
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Abstract
Description
<第1の洗浄試験>
次に、第1の洗浄試験について説明する。第1の洗浄試験では、合計11個の試料に対し、下記の実施例1、実施例2または比較例の態様の洗浄試験を行った。
<第2の洗浄試験>
また、本願発明者らは、オゾン水供給工程(T7)を追加すれば、外周モードの発生を抑制でき、その結果洗浄効率が向上するのはないかと考えている。それを検証するために第2の洗浄試験を行った。
は500(ミリリットル/分)である。
2 :処理ユニット
3 :制御装置
4 :処理チャンバー
5 :スピンチャック
6 :FOMノズル(オゾン含有フッ酸溶液供給ユニット)
7 :FOM供給装置(オゾン含有フッ酸溶液供給ユニット)
8 :水供給ユニット
10 :洗浄ブラシ
10a :洗浄面
21 :ノズルアーム
22 :ノズル移動ユニット
23 :フッ酸配管
24 :オゾン水配管
25 :フッ酸バルブ
26 :フッ酸流量調整バルブ
27 :オゾン水バルブ
28 :オゾン水流量調整バルブ
47 :揺動アーム
48 :アーム駆動ユニット
103 :回転駆動ユニット
107 :回転台
110 :保持ピン
111 :固定ピン
112 :可動ピン
115 :保護ディスク
170 :不活性ガス供給管
172 :不活性ガス供給路
173 :不活性ガスバルブ
174 :不活性ガス流量調整バルブ
190 :絞り部
191 :カバー
192 :円環板部
193 :円筒部
M :メタル層
W :基板
Wa :表面
Wb :裏面
Claims (15)
- 基板保持ユニットに基板を保持させる基板保持工程と、
前記基板保持ユニットに保持されている前記基板の一方主面に、フッ酸溶液にオゾンが溶解したオゾン含有フッ酸溶液を供給するオゾン含有フッ酸溶液供給工程と、
前記オゾン含有フッ酸溶液供給工程の後に、前記基板の前記一方主面に洗浄ブラシを接触させることにより、当該一方主面を洗浄するブラシ洗浄工程と、
前記オゾン含有フッ酸溶液供給工程の後前記ブラシ洗浄工程の開始に先立って、または前記ブラシ洗浄工程に並行して、前記基板の前記一方主面にオゾン水を供給するオゾン水供給工程とを含む、基板処理方法。 - 前記オゾン水供給工程は、前記オゾン含有フッ酸溶液供給工程の後前記ブラシ洗浄工程の開始に先立って前記基板の前記一方主面にオゾン水を供給する工程を含む、請求項1に記載の基板処理方法。
- 前記オゾン含有フッ酸溶液供給工程は、前記基板保持ユニットに保持されている前記基板の一方主面の中央部に向けてオゾン含有フッ酸溶液を吐出する工程を含み、
前記基板処理方法は、
前記オゾン含有フッ酸溶液供給工程に並行して、前記基板を所定の回転軸線まわりに回転させる基板回転工程をさらに含む、請求項1または2に記載の基板処理方法。 - 前記オゾン水供給工程は、前記基板の前記一方主面の中央部に向けてオゾン水を吐出する中央部オゾン水吐出工程を含む、請求項3に記載の基板処理方法。
- 前記オゾン水供給工程は、前記基板の前記一方主面の外周部に向けてオゾン水を吐出する外周部オゾン水吐出工程を含む、請求項3に記載の基板処理方法。
- 前記オゾン水供給工程において前記基板の前記一方主面に供給される前記オゾン水のオゾン濃度は、50ppm以上である、請求項1~5のいずれか一項に記載の基板処理方法。
- 前記オゾン含有フッ酸溶液供給工程と並行して、他方主面への前記オゾン含有フッ酸溶液の回り込みを防止または抑制すべく、前記他方主面に保護流体を供給する保護流体供給工程をさらに含む、請求項1~6のいずれか一項に記載の基板処理方法。
- 前記基板は半導体基板を含み、
前記基板の前記他方主面は、デバイスを形成するためのデバイス形成面であり、
前記基板の前記一方主面は、前記デバイスが形成されないデバイス非形成面である、請求項7に記載の基板処理方法。 - 前記デバイス形成面は、メタル層を含む、請求項8に記載の基板処理方法。
- 前記保護流体供給工程は、前記他方主面に保護気体を供給する保護気体供給工程を含む、請求項7~9のいずれか一項に記載の基板処理方法。
- 前記オゾン含有フッ酸溶液供給工程において、前記オゾン含有フッ酸溶液の吐出流量は、0.5リットル/分以上1.0リットル/分以下である、請求項10に記載の基板処理方法。
- 前記基板保持工程は、前記基板を水平姿勢に保持させる工程を含み、
前記オゾン含有フッ酸溶液供給工程は、前記基板の上面に前記オゾン含有フッ酸溶液を吐出する工程を含み、
前記ブラシ洗浄工程は、前記基板の前記上面を洗浄する工程を含む、請求項1~11のいずれか一項に記載の基板処理方法。 - 前記基板の前記一方主面は、シリコン成分を含むシリコン含有面を含む、請求項1~12のいずれか一項に記載の基板処理方法。
- 前記基板の前記一方主面は、チタンナイトライドを含むチタンナイトライド含有面を含む、請求項1~13のいずれか一項に記載の基板処理方法。
- 基板を保持する基板保持ユニットと、
前記基板保持ユニットに保持されている基板の一方主面に、フッ酸溶液にオゾンが溶解したオゾン含有フッ酸溶液を供給するためのオゾン含有フッ酸溶液供給ユニットと、
前記基板の前記一方主面にオゾン水を供給するためのオゾン水供給ユニットと、
前記一方主面に接触して当該一方主面を洗浄するための洗浄ブラシと、
前記洗浄ブラシを駆動するための洗浄ブラシ駆動ユニットとを含み、
前記オゾン含有フッ酸溶液供給ユニット、前記オゾン水供給ユニットおよび前記洗浄ブラシ駆動ユニットを制御して、前記基板の一方主面に前記オゾン含有フッ酸溶液を供給するオゾン含有フッ酸溶液供給工程と、前記オゾン含有フッ酸溶液供給工程の後に、前記基板の前記一方主面に洗浄ブラシを接触させることにより、当該一方主面を洗浄するブラシ洗浄工程と、前記オゾン含有フッ酸溶液供給工程の後前記ブラシ洗浄工程の開始に先立って、または前記ブラシ洗浄工程に並行して、前記基板の前記一方主面にオゾン水を供給するオゾン水供給工程とを実行する制御装置を含む、基板処理装置。
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KR102167465B1 (ko) | 2020-10-19 |
JP6718714B2 (ja) | 2020-07-08 |
TW201802924A (zh) | 2018-01-16 |
US20190035622A1 (en) | 2019-01-31 |
TWI631610B (zh) | 2018-08-01 |
KR20180109972A (ko) | 2018-10-08 |
CN108701606B (zh) | 2024-01-05 |
CN108701606A (zh) | 2018-10-23 |
US11764055B2 (en) | 2023-09-19 |
JP2017175062A (ja) | 2017-09-28 |
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