WO2017154599A1 - 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
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- WO2017154599A1 WO2017154599A1 PCT/JP2017/006881 JP2017006881W WO2017154599A1 WO 2017154599 A1 WO2017154599 A1 WO 2017154599A1 JP 2017006881 W JP2017006881 W JP 2017006881W WO 2017154599 A1 WO2017154599 A1 WO 2017154599A1
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- Prior art keywords
- substrate
- inert gas
- liquid
- drying
- opening
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Images
Classifications
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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
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
- H01L21/6704—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing
- H01L21/67051—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
-
- 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
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/024—Cleaning by means of spray elements moving over the surface to be cleaned
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02046—Dry cleaning only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02054—Cleaning before device manufacture, i.e. Begin-Of-Line process combining dry and wet cleaning steps
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
- H01L21/67034—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for drying
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/6715—Apparatus for applying a liquid, a resin, an ink or the like
Definitions
- the present invention relates to a substrate processing apparatus and a substrate processing method for processing a substrate with a liquid.
- 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, and photomasks.
- Substrates such as substrates for substrates, ceramic substrates, and substrates for solar cells are included.
- a chemical solution is supplied to a substrate held almost horizontally by a spin chuck. Thereafter, the rinsing liquid is supplied to the substrate, whereby the chemical liquid on the substrate is replaced with the rinsing liquid. Thereafter, a spin dry process for removing the rinse liquid on the substrate is performed.
- the spin dry process may not remove the rinse liquid that has entered the pattern, which may cause poor drying. . Since the liquid level of the rinse liquid that has entered the pattern (the interface between air and liquid) is formed in the pattern, the surface tension of the liquid acts at the contact position between the liquid level and the pattern. When this surface tension is large, the pattern tends to collapse. Since water, which is a typical rinsing liquid, has a large surface tension, pattern collapse in the spin drying process cannot be ignored.
- IPA isopropyl Alcohol
- a wafer cleaning apparatus disclosed in Patent Document 1 includes a nozzle head provided with an IPA discharge nozzle and a nitrogen gas discharge nozzle at the tip, and a gas discharge head that covers almost the entire top surface of the substrate and can discharge low-humidity gas. And have.
- the IPA liquid film is moved to the outside of the substrate by centrifugal force by moving the nozzle head from the center of the substrate toward the periphery while discharging the IPA from the IPA discharge nozzle while the substrate is rotated. Extrude.
- the IPA remaining on the upper surface of the substrate after the liquid film is pushed out by centrifugal force is evaporated to dry the upper surface of the substrate. Therefore, when the nozzle head is moved from the center of the substrate toward the peripheral edge, the nitrogen gas discharge nozzle Nitrogen gas is discharged, or low humidity gas is discharged from the gas discharge head toward the upper surface of the substrate while the nozzle head moves from the center of the substrate toward the periphery.
- the gas discharge head covers almost the entire upper surface of the substrate. Therefore, since the nozzle head must be moved between the gas discharge head and the upper surface of the substrate, the gas discharge head cannot be brought sufficiently close to the upper surface of the substrate. Therefore, there is a possibility that the substrate cannot be quickly dried.
- FIG. 11 of Patent Document 1 also discloses a configuration in which a cutout is provided in the gas discharge head in order to bring the gas discharge head closer to the upper surface of the substrate while avoiding interference with the nozzle head.
- nitrogen gas is continuously supplied from the gas discharge head to the entire upper surface of the substrate.
- the IPA is locally evaporated before the liquid film of IPA is removed by centrifugal force, and the liquid film is broken.
- the substrate is exposed.
- a droplet may remain partially on the upper surface of the substrate. This droplet continues to apply surface tension to the pattern on the substrate until it eventually evaporates. As a result, pattern collapse may occur.
- one object of the present invention is to provide a substrate processing method and a substrate processing apparatus that can favorably exclude a low surface tension liquid from the upper surface of the substrate.
- the present invention includes a substrate holding step for horizontally holding a substrate, a liquid film forming step for forming a liquid film of a low surface tension liquid having a lower surface tension than water on the upper surface of the horizontally held substrate, An opening forming step for forming an opening in the central region of the liquid film of the low surface tension liquid, a liquid film removing step for removing the liquid film from the upper surface of the substrate by widening the opening, and supplying a low surface tension liquid
- the liquid landing point is moved so as to follow the spread of the opening while supplying a low surface tension liquid to the liquid film from the low surface tension liquid nozzle to the liquid landing point set outside the opening.
- a liquid spot moving step, and the opposite surface of the drying head having the opposite surface having a smaller size in plan view than the substrate is opposed to the drying region set on the inner side of the opening. Outside the space in the space between While forming a low-humidity space Rimohiku humidity, the drying region and the opposing surface comprising a drying area moving step of moving so as to follow the extent of the opening, to provide a substrate processing method.
- the humidity is lower than that outside the space. A space is formed. Therefore, the low surface tension liquid remaining in the dry region can be quickly evaporated.
- the drying area and the opposing surface move following the opening of the liquid film. Therefore, the low surface tension liquid remaining on the upper surface of the substrate after the liquid film of the low surface tension liquid is eliminated can be quickly evaporated. In addition, since the drying area where the opposed surfaces are opposed is relatively wide, local external force is unlikely to act on the upper surface of the substrate.
- the size of the opposing surface is smaller than that of the substrate. Therefore, the opposing surface can be moved while the drying head is disposed at a position avoiding the low surface tension liquid nozzle, that is, a position sufficiently close to the upper surface of the substrate. Thereby, the low surface tension liquid remaining in the dry region can be evaporated more rapidly.
- the drying area is set inside the opening, and the landing point is set outside the opening. Therefore, a sufficient amount of the low surface tension liquid can be supplied to the liquid film while suppressing the spontaneous evaporation of the low surface tension liquid from the liquid film until the liquid film is removed from the upper surface of the substrate. . Therefore, it is possible to suppress the occurrence of cracking of the liquid film due to local evaporation of the liquid film before the liquid film is eliminated due to the expansion of the opening.
- the low surface tension liquid can be well excluded from the upper surface of the substrate.
- the drying region moving step includes a step of moving the drying region along a movement locus of the liquid landing point so as to follow the movement of the liquid landing point. Therefore, the low surface tension liquid can be quickly evaporated by the drying head before the low surface tension liquid that has landed on the landing point naturally evaporates.
- the opening forming step includes an inert gas spraying step of spraying an inert gas toward a central region of the substrate.
- the inert gas spraying process is continued until the liquid film removing process is completed.
- the opening can be efficiently and reliably formed in the central region by spraying the inert gas toward the central region of the liquid film in the opening forming step. Further, the blowing of the inert gas is continued until the liquid film removing step is completed. Thereby, the expansion of the opening is promoted, and the low surface tension liquid can be removed out of the substrate more quickly.
- the substrate processing method further includes a substrate rotating step of rotating the substrate in parallel with the liquid film removing step.
- the opening can be promoted by the centrifugal force generated by the rotation of the substrate.
- the low surface tension liquid can be quickly removed from the substrate.
- the landing point of the low surface tension liquid scans the substrate outside the liquid film opening, and the dry region scans the substrate inside the opening. Thereby, a uniform drying process can be performed on the entire top surface of the substrate.
- the substrate rotation step includes a rotation reduction step of gradually reducing the rotation of the substrate.
- the drying area is located near the central area on the upper surface of the substrate.
- the dry region is located near the periphery of the upper surface of the substrate.
- the distance that the drying area moves relative to the upper surface of the substrate in the substrate rotation direction per unit time in the final stage of the liquid film removal process is the same as that in the liquid film removal process.
- the drying area is larger than the distance that the drying area moves relative to the upper surface of the substrate in the direction of rotation of the substrate per unit time. Therefore, in the final stage of the liquid film removal process, the substrate upper surface drying time per unit area, that is, the time facing the drying head is shorter than that in the initial stage of the liquid film removal process.
- the distance that the drying area moves relative to the substrate rotation direction per unit time in the final stage of the liquid film removal process is reduced, and the substrate top surface drying time per unit area Can be lengthened.
- the difference in the substrate upper surface drying time per unit area can be reduced between the initial stage and the final stage of the liquid film removing process. Therefore, according to this method, drying unevenness on the upper surface of the substrate can be reduced.
- the drying region is set so that a region wider than half is located on the downstream side in the substrate rotation direction with respect to the liquid landing point. For this reason, the low surface tension liquid can be evaporated more reliably before the low surface tension liquid deposited on the landing point naturally evaporates.
- the drying region has a fan-like planar shape, the main part of the fan-shape is arranged at a position far from the liquid landing point, and the fan-shaped arc is close to the liquid landing point. And it arrange
- the fan-shaped key is disposed at a position far from the liquid landing point, and the fan-shaped arc is disposed near the liquid landing point.
- the fan-shaped arc is located closer to the periphery of the substrate than necessary, so that the time during which each portion of the substrate upper surface faces the facing surface of the drying head, that is, the difference in drying time can be reduced. Therefore, uneven drying on the upper surface of the substrate can be reduced.
- the low surface tension liquid nozzle and the drying head are supported by a common moving member, and the landing point moving step and the drying region moving step move the moving member. Process.
- the moving member that supports the low surface tension liquid nozzle and the drying head in common is moved, so that the low surface tension liquid nozzle and the drying head are moved.
- the distance between them is kept constant. Therefore, since the entire top surface of the substrate can be dried under uniform conditions, uneven drying on the top surface of the substrate can be reduced.
- the drying head is an inert gas supply head that supplies an inert gas.
- the humidity of the low-humidity space can be reduced by the inert gas. Therefore, since the low surface tension liquid can be quickly evaporated from the upper surface of the substrate, the upper surface of the substrate can be quickly dried.
- the facing surface is recessed upward from the upper surface of the substrate to form an inert gas storage space
- the inert gas supply head is provided with an inert gas in the inert gas storage space.
- Including an inert gas inlet is provided.
- the opposing surface is recessed upward from the upper surface of the substrate to form an inert gas storage space.
- the inert gas supplied from the inert gas inlet is stored. Therefore, the low surface tension liquid remaining on the upper surface of the substrate can be evaporated by the inert gas stored in the inert gas storage space. Therefore, the low surface tension liquid in the dry region can be evaporated more rapidly.
- the inert gas supply head further includes an exhaust port for exhausting the inert gas storage space.
- the exhaust port exhausts the inert gas storage space.
- the low surface tension liquid evaporated from the upper surface of the substrate into vapor is excluded from the low humidity space through the inert gas storage space.
- the low humidity space can be kept at a lower humidity, the low surface tension liquid in the dry region can be evaporated more rapidly.
- the facing surface is a flat surface parallel to the upper surface of the substrate, and a plurality of inert gas discharge ports are formed on the facing surface.
- the inert gas supply head includes an inert gas storage space communicating with the plurality of inert gas discharge ports and an inert gas introduction port for supplying an inert gas to the inert gas storage space.
- the inert gas from the inert gas inlet is supplied to the inert gas storage space.
- the inert gas storage space communicates with a plurality of inert gas discharge ports formed on opposing surfaces that are flat surfaces parallel to the upper surface of the substrate. Therefore, compared with the case where the inert gas is supplied from one discharge port, the inert gas can be supplied uniformly over a wide range, so that a low-humidity space with less humidity unevenness can be formed. Therefore, the low surface tension liquid in the dry region can be quickly evaporated, and uneven drying on the upper surface of the substrate can be reduced.
- the momentum of the inert gas supplied to the upper surface of the substrate can be reduced. Therefore, it is possible to suppress a large external force from acting locally on the upper surface of the substrate.
- the drying head includes a heater unit that heats the drying region. Thereby, evaporation of the low surface tension liquid in the dry region can be further promoted.
- the drying head includes an exhaust unit that exhausts a space between the facing surface and the drying region.
- the vapor of the low surface tension liquid can be excluded from the low humidity space by the exhaust unit that exhausts the space between the facing surface and the dry region. Therefore, the low surface tension liquid in the dry region can be evaporated more rapidly.
- a substrate processing apparatus supplies a substrate holding unit that horizontally holds a substrate and a low surface tension liquid having a surface tension lower than that of water to the upper surface of the substrate held by the substrate holding unit.
- a low surface tension liquid supply unit an opening forming unit for forming an opening in a central region of the liquid film of the low surface tension liquid formed on the upper surface of the substrate held by the substrate holding unit, and held by the substrate holding unit.
- the substrate is opposed to the upper surface of the substrate, has a facing surface that is smaller in plan view than the substrate, and forms a low-humidity space in the space between the facing surface and the upper surface of the substrate at a lower humidity than outside the space.
- a drying head that dries the upper surface of the substrate, and a drying head moving unit that moves the drying head along the upper surface of the substrate held by the substrate holding unit.
- a liquid film of low surface tension liquid is formed on the substrate, and an opening is formed in the central region of the liquid film.
- a low-humidity space having a lower humidity than the outside of the space is formed in a space between the facing surface facing the drying region set inside the opening and the drying region. Therefore, the low surface tension liquid remaining in the dry region can be quickly evaporated.
- the substrate processing apparatus further includes a controller for controlling the low surface tension liquid supply unit, the opening forming unit, the drying head, and the drying head moving unit.
- a liquid film forming step in which the controller supplies a low surface tension liquid from the low surface tension liquid supply unit to the upper surface of the substrate to form a liquid film of the low surface tension liquid on the upper surface of the substrate;
- An opening forming step for forming an opening in the central region of the liquid film by the unit, a liquid film removing step for removing the liquid film from the upper surface of the substrate by widening the opening, and a supply from the low surface tension liquid supply unit
- a landing point moving step of moving the landing point to follow the spread of the opening by setting the landing point of the low surface tension liquid outside the opening and drying set to the inside of the opening
- the drying region and the facing surface follow the opening of the liquid film of the low surface tension liquid. Therefore, the low surface tension liquid remaining on the upper surface of the substrate after the liquid film of the low surface tension liquid is eliminated can be quickly evaporated. In addition, since the drying area where the opposed surfaces are opposed is relatively wide, local external force is unlikely to act on the upper surface of the substrate.
- the size of the opposing surface is smaller than that of the substrate. Therefore, the opposing surface can be moved while the drying head is disposed at a position avoiding the low surface tension liquid nozzle, that is, a position sufficiently close to the upper surface of the substrate. Thereby, the low surface tension liquid remaining in the dry region can be evaporated more rapidly.
- the drying area is set inside the opening and the landing point is set outside the opening, the low surface tension liquid naturally comes from the liquid film until the liquid film is removed from the upper surface of the substrate.
- a sufficient amount of low surface tension liquid is supplied to the liquid film while suppressing evaporation. Therefore, it is possible to suppress the occurrence of cracking of the liquid film due to local evaporation of the liquid film before the liquid film is eliminated due to the expansion of the opening.
- the low surface tension liquid can be well excluded from the upper surface of the substrate.
- the controller performs a step of moving the drying region along a movement locus of the liquid landing point so as to follow the movement of the liquid landing point in the drying region moving step. Is programmed to do. Therefore, the low surface tension liquid can be quickly evaporated by the drying head before the low surface tension liquid that has landed on the landing point naturally evaporates.
- the opening forming unit includes an inert gas supply unit that blows an inert gas toward a central region of the substrate held by the substrate holding unit.
- the controller executes an inert gas blowing process for supplying an inert gas from the inert gas supply unit in the opening forming process, and the inert gas blowing is performed until the liquid film removing process is completed. Programmed to continue the process.
- the opening can be efficiently and reliably formed in the central region by spraying the inert gas toward the central region of the liquid film in the opening forming step. Further, the blowing of the inert gas is continued until the liquid film removing step is completed. Thereby, the expansion of the opening is promoted, and the low surface tension liquid can be removed out of the substrate more quickly.
- the substrate processing apparatus further includes a substrate rotation unit that rotates the substrate held by the substrate holding unit around a predetermined rotation axis along the vertical direction. Further, the controller is programmed to execute a substrate rotation process for rotating the substrate in parallel with the liquid film removal process.
- the opening can be promoted by the centrifugal force generated by the rotation of the substrate.
- the low surface tension liquid can be quickly removed from the substrate.
- the landing point of the low surface tension liquid scans the substrate outside the opening of the liquid film, and the dry region scans the substrate inside the opening. Thereby, a uniform drying process can be performed on the entire top surface of the substrate.
- the controller is programmed to execute a rotation reduction step of gradually reducing the rotation of the substrate in the substrate rotation step.
- the controller is programmed to set the drying region so that a region wider than half is located downstream of the liquid deposition point in the substrate rotation direction. For this reason, the low surface tension liquid can be evaporated more reliably before the low surface tension liquid deposited on the landing point naturally evaporates.
- the opposing surface has a fan-like planar shape, the main part of the fan-shape is arranged at a position far from the liquid landing point, and the fan-shaped arc is close to the liquid landing point. And it arrange
- the fan-shaped key is arranged at a position far from the landing point, and the fan-shaped arc is arranged near the landing point.
- an arc larger in the substrate rotation direction than necessary can be arranged on the peripheral side of the substrate more than necessary. Therefore, since the fan-shaped arc is located on the peripheral side of the substrate, it is possible to reduce the time during which each part on the upper surface of the substrate faces the facing surface of the drying head, that is, the difference in drying time. Therefore, uneven drying on the upper surface of the substrate can be reduced.
- the low surface tension liquid supply unit includes a low surface tension liquid nozzle that supplies a low surface tension liquid toward an upper surface of the substrate held by the substrate holding unit.
- the substrate processing apparatus further includes a moving member that supports the low surface tension liquid nozzle and the drying head in common and moves the low surface tension liquid nozzle and the drying head above the substrate.
- the drying head moving unit moves the moving member.
- the distance between the low surface tension liquid nozzle and the drying head is kept constant by moving the moving member that commonly supports the low surface tension liquid nozzle and the drying head. Therefore, since the entire upper surface of the substrate can be dried under uniform conditions, drying unevenness can be reduced.
- the drying head is an inert gas supply head that supplies an inert gas. Therefore, the humidity in the low humidity space can be reduced by the inert gas. Thereby, since the low surface tension liquid can be quickly evaporated from the upper surface of the substrate, the upper surface of the substrate can be quickly dried.
- the facing surface is recessed upward from the upper surface of the substrate held by the substrate holding unit to form an inert gas storage space.
- the inert gas supply head includes an inert gas inlet for supplying an inert gas to the inert gas storage space.
- the opposing surface is recessed upward from the upper surface of the substrate to form an inert gas storage space.
- the inert gas supplied from the inert gas inlet is stored. Therefore, the low surface tension liquid remaining on the upper surface of the substrate can be evaporated by the inert gas stored in the inert gas storage space. Therefore, the low surface tension liquid on the upper surface of the substrate can be evaporated more rapidly.
- the inert gas supply head further includes an exhaust port for exhausting the inert gas storage space.
- the low surface tension liquid evaporated from the upper surface of the substrate into vapor by the exhaust port that exhausts the inert gas storage space is excluded from the low humidity space through the inert gas storage space.
- the facing surface is a flat surface parallel to the upper surface of the substrate, and a plurality of inert gas discharge ports are formed on the facing surface.
- the inert gas supply head includes an inert gas storage space that communicates with the plurality of inert gas discharge ports, and an inert gas inlet that supplies an inert gas to the inert gas storage space.
- the inert gas from the inert gas inlet is supplied to the inert gas storage space.
- the inert gas storage space communicates with a plurality of inert gas discharge ports formed on opposing surfaces that are flat surfaces parallel to the upper surface of the substrate. Therefore, compared with the case where the inert gas is supplied from one discharge port, the inert gas can be supplied uniformly over a wide range, so that a low-humidity space with less humidity unevenness can be formed. Therefore, the low surface tension liquid on the upper surface of the substrate can be evaporated evenly and quickly.
- the momentum of the inert gas supplied to the upper surface of the substrate can be reduced. Therefore, it is possible to suppress a large external force from acting locally on the upper surface of the substrate.
- the drying head includes a heater unit that heats the upper surface of the substrate held by the substrate holding unit. Thereby, evaporation of the low surface tension liquid on the upper surface of the substrate can be further promoted.
- the drying head includes an exhaust unit that exhausts a space between the facing surface and the upper surface of the substrate held by the substrate holding unit.
- the low surface tension liquid vapor can be removed from the low humidity space by the exhaust unit that exhausts the space between the opposing surface and the upper surface of the substrate. Therefore, the low surface tension liquid on the upper surface of the substrate can be evaporated more rapidly.
- FIG. 1 is an illustrative plan view for explaining the internal layout of the substrate processing apparatus according to the first 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. 3A is a schematic longitudinal sectional view of a drying head provided in the processing unit.
- 3B is a cross-sectional view taken along line IIIb-IIIb in FIG. 3A.
- FIG. 4 is a block diagram for explaining an electrical configuration of a main part of the substrate processing apparatus.
- FIG. 5 is a flowchart for explaining an example of substrate processing by the substrate processing apparatus.
- FIG. 6 is a time chart for explaining details of the organic solvent treatment (S4 in FIG. 5).
- FIG. 7A is a schematic cross-sectional view for explaining the state of the organic solvent treatment (S4 in FIG. 5).
- FIG. 7B is a schematic cross-sectional view for explaining the state of the organic solvent treatment (S4 in FIG. 5).
- FIG. 7C is a schematic cross-sectional view for explaining the state of the organic solvent treatment (S4 in FIG. 5).
- FIG. 7D is a schematic cross-sectional view for explaining the state of the organic solvent treatment (S4 in FIG. 5).
- FIG. 8A is a plan view schematically showing the landing point and the movement trajectory of the drying region in the hole expanding step shown in FIG. 7D.
- FIG. 8B is an enlarged view of the periphery of the liquid spot and the dry region of FIG. 8A.
- FIG. 9 is a schematic cross-sectional view showing a drying head provided in a processing unit according to a first modification of the first embodiment.
- FIG. 10 is a schematic cross-sectional view showing a drying head provided in a processing unit according to a second modification of the first embodiment.
- FIG. 11 is a schematic cross-sectional view showing a drying head provided in a processing unit according to a third modification of the first embodiment.
- FIG. 12 is a schematic cross-sectional view showing a drying head provided in a processing unit according to a fourth modification of the first embodiment.
- FIG. 13 is a schematic cross-sectional view showing a drying head provided in a processing unit according to a fifth modification of the first embodiment.
- FIG. 14 is an illustrative sectional view for explaining a configuration example of a processing unit provided in the substrate processing apparatus according to the second embodiment of the present invention.
- FIG. 15 is a plan view schematically showing the landing point and the movement trajectory of the drying region in the hole expanding step in the second embodiment.
- FIG. 16 is a schematic cross-sectional view for explaining the principle of pattern collapse due to surface tension.
- FIG. 1 is an illustrative plan view for explaining the internal layout of the substrate processing apparatus 1 according to the first embodiment of the present invention.
- the substrate processing apparatus 1 is a single wafer processing apparatus that processes substrates W such as silicon wafers one by one.
- the substrate W is a circular substrate.
- the diameter of the substrate W is, for example, 300 mm.
- a fine pattern (see FIG. 16) is formed on the surface of the substrate W.
- the substrate processing apparatus 1 includes a plurality of processing units 2 that process a substrate W with a processing liquid, a load port LP on which a carrier C that houses a plurality of substrates W processed by the processing unit 2 is placed, a load port A transfer robot IR and CR that transfer the substrate W between the LP and the processing unit 2 and a controller 3 that controls the substrate processing apparatus 1 are included.
- the transfer robot IR transfers the substrate W between the carrier C and the transfer robot CR.
- the transfer robot CR transfers the substrate W between the transfer robot IR and the processing unit 2.
- the plurality of processing units 2 have the same configuration, for example.
- FIG. 2 is a schematic cross-sectional view for explaining a configuration example of the processing unit 2.
- the processing unit 2 includes a spin chuck 5 that rotates the substrate W about a vertical rotation axis A1 that passes through the center of the substrate W while holding a single substrate W in a horizontal posture.
- the spin chuck 5 is isolated from the outside by a wall surface (not shown).
- the processing unit 2 has an ambient atmosphere between the heater mechanism 6 that heats the substrate W from the lower surface (lower main surface) side and the substrate W facing the upper surface (upper main surface) of the substrate W.
- a blocking plate 7 for blocking the substrate
- a cylindrical cup 8 surrounding the spin chuck 5, and a lower surface nozzle 9 for supplying a processing fluid to the lower surface of the substrate W.
- the processing unit 2 includes a DIW nozzle 10 that supplies deionized water (DIW) as a rinsing liquid to the upper surface of the substrate W, and an inert gas such as nitrogen gas (N2) in the central region of the upper surface of the substrate W. It further includes an inert gas nozzle 11 to be supplied and a moving nozzle 12 that is movable above the substrate W.
- the central region of the upper surface of the substrate W is a region in the vicinity of the center of the upper surface of the substrate W including the intersection position with the rotation axis A1 on the upper surface of the substrate W.
- the processing unit 2 includes an organic solvent nozzle 13 for supplying an organic solvent (for example, IPA) as a low surface tension liquid having a surface tension lower than that of water to the upper surface of the substrate W, and an inert gas such as nitrogen gas on the upper surface of the substrate W. And a drying head 14 that dries the upper surface of the substrate W.
- the drying head 14 is an inert gas supply head that supplies an inert gas.
- the processing unit 2 further includes a chamber 16 (see FIG. 1) that houses the cup 8. Although illustration is omitted, the chamber 16 is formed with a loading / unloading port for loading / unloading the substrate W, and is provided with a shutter unit that opens and closes the loading / unloading port.
- the spin chuck 5 includes a chuck pin 20, a spin base 21, a rotation shaft 22, and an electric motor 23 that rotates the substrate W about the rotation axis A1.
- the chuck pins 20 and the spin base 21 are included in a substrate holding unit that holds the substrate W horizontally.
- the substrate holding unit is also called a substrate holder.
- the rotation shaft 22 and the electric motor 23 are included in a substrate rotation unit that rotates the substrate W held by the chuck pins 20 and the spin base 21 around the rotation axis A1.
- the rotation shaft 22 extends in the vertical direction along the rotation axis A1, and is a hollow shaft in this embodiment.
- the upper end of the rotating shaft 22 is coupled to the center of the lower surface of the spin base 21.
- the spin base 21 has a disk shape along the horizontal direction.
- a plurality of chuck pins 20 for holding the substrate W are arranged at intervals in the circumferential direction on the peripheral edge of the upper surface of the spin base 21.
- the heater mechanism 6 has a hot plate shape, and includes a disk-shaped plate body 45 and a heater 46 supported by the plate body 45.
- the heater mechanism 6 is disposed above the spin base 21.
- An elevating shaft 24 that extends in the vertical direction along the rotation axis A ⁇ b> 1 is coupled to the lower surface of the heater mechanism 6.
- the elevating shaft 24 is inserted through a through hole formed in the central portion of the spin base 21 and a hollow rotating shaft 22.
- the lower end of the elevating shaft 24 extends further downward than the lower end of the rotating shaft 22.
- a heater elevating mechanism 26 is coupled to the lower end of the elevating shaft 24. By operating the heater elevating mechanism 26, the heater mechanism 6 moves up and down from a lower position near the upper surface of the spin base 21 to an upper position near the lower surface of the substrate W.
- the heater 46 may be a resistor built in the plate body 45. By energizing the heater 46, the heating surface 45a that is the upper surface of the plate body 45 is heated to a temperature higher than room temperature (for example, 20 to 30 ° C.).
- a power supply line 47 to the heater 46 is passed through the elevating shaft 24.
- a heater energization mechanism 48 that supplies power to the heater 46 is connected to the power supply line 47.
- the heater energization mechanism 48 includes, for example, a power supply unit.
- the lower surface nozzle 9 is inserted through a hollow lifting shaft 24.
- the lower surface nozzle 9 passes through the heater mechanism 6.
- the lower surface nozzle 9 has a discharge port 9a facing the center of the lower surface of the substrate W at the upper end.
- a heating fluid such as warm water is supplied to the lower surface nozzle 9 from a heating fluid supply source via a heating fluid supply pipe 30.
- the heating fluid supply pipe 30 is provided with a heating fluid valve 31 for opening and closing the flow path.
- Hot water is water that is hotter than room temperature.
- the warm water is, for example, 80 ° C. to 85 ° C. water.
- the heating fluid is not limited to hot water, and may be a gas such as high-temperature nitrogen gas.
- the heating fluid may be any fluid that can heat the substrate W.
- the blocking plate 7 is formed in a disc shape having a diameter substantially the same as or larger than that of the substrate W.
- the blocking plate 7 is disposed substantially horizontally above the spin chuck 5.
- a hollow shaft 27 is fixed to the surface of the blocking plate 7 opposite to the surface facing the upper surface of the substrate W.
- the hollow shaft 27 is coupled with a blocking plate lifting / lowering unit 28 that lifts and lowers the blocking plate 7 fixed to the hollow shaft 27 by moving the hollow shaft 27 up and down along the vertical direction.
- the blocking plate lifting / lowering unit 28 can position the blocking plate 7 at an arbitrary position (height) from the lower position to the upper position.
- the blocking plate lifting / lowering unit 28 includes, for example, a ball screw mechanism (not shown) and an electric motor (not shown) that gives a driving force thereto.
- the inert gas nozzle 11 can supply an inert gas such as nitrogen gas (N 2) toward the central region of the upper surface of the substrate W.
- the inert gas is not limited to nitrogen gas, but is an inert gas with respect to the surface and pattern of the substrate W.
- the inert gas is a rare gas such as argon.
- a first inert gas supply pipe 43 that supplies an inert gas such as nitrogen gas is coupled to the inert gas nozzle 11.
- a first inert gas valve 44 that opens and closes the flow path is interposed in the first inert gas supply pipe 43.
- the DIW nozzle 10 is a fixed nozzle arranged to discharge DIW toward the center of rotation of the upper surface of the substrate W.
- DIW is supplied to the DIW nozzle 10 from a DIW supply source via a DIW supply pipe 32.
- a DIW valve 33 for opening and closing the flow path is interposed in the DIW supply pipe 32.
- the DIW nozzle 10 does not have to be a fixed nozzle, and may be a moving nozzle that moves at least in the horizontal direction.
- the DIW nozzle 10 may be a rinse liquid nozzle that supplies a rinse liquid other than DIW.
- rinsing liquid examples include, in addition to water, carbonated water, field ion water, ozone water, dilute concentration (for example, about 10 to 100 ppm) hydrochloric acid water, reduced water (hydrogen water), and the like.
- the moving nozzle 12 is moved in the horizontal and vertical directions by the nozzle moving unit 29.
- the moving nozzle 12 moves in the horizontal direction between a position facing the rotation center of the upper surface of the substrate W and a home position (retracted position) not facing the upper surface of the substrate W.
- the home position is a position outside the spin base 21 in a plan view, and more specifically, may be a position outside the cup 8.
- the moving nozzle 12 can be moved closer to the upper surface of the substrate W or retreated upward from the upper surface of the substrate W by moving in the vertical direction.
- the nozzle moving unit 29 includes, for example, a rotation shaft along the vertical direction, an arm coupled to the rotation shaft and extending horizontally, and an arm drive mechanism that drives the arm.
- the moving nozzle 12 functions as a chemical nozzle for supplying chemicals such as acid and alkali. More specifically, the moving nozzle 12 may have a form of a two-fluid nozzle that can mix and discharge a liquid and a gas. The two-fluid nozzle can be used as a straight nozzle if gas supply is stopped and liquid is discharged.
- a chemical solution supply pipe 34 and a second inert gas supply pipe 35 are coupled to the moving nozzle 12.
- a chemical liquid valve 36 that opens and closes the flow path is interposed in the chemical liquid supply pipe 34.
- a second inert gas valve 37 that opens and closes the flow path is interposed in the second inert gas supply pipe 35.
- a chemical solution such as acid or alkali is supplied to the chemical solution supply pipe 34 from a chemical solution supply source.
- the second inert gas supply pipe 35 is supplied with nitrogen gas as an inert gas from an inert gas supply source.
- the chemical solution is an etching solution and a cleaning solution. More specifically, the chemical solution is not limited to hydrofluoric acid, but sulfuric acid, acetic acid, nitric acid, hydrochloric acid, hydrofluoric acid, aqueous ammonia, aqueous hydrogen peroxide, organic acids (eg, citric acid, oxalic acid, etc.), organic alkalis (eg, , TMAH: tetramethylammonium hydroxide, etc.), a surfactant, and a liquid containing at least one of a corrosion inhibitor.
- organic acids eg, citric acid, oxalic acid, etc.
- organic alkalis eg, , TMAH: tetramethylammonium hydroxide, etc.
- surfactant e.g, TMAH: tetramethylammonium hydroxide, etc.
- Examples of the chemical solution in which these are mixed include SPM (sulfuric acid / hydrogen peroxide mixture: sulfuric acid hydrogen peroxide solution mixture), SC1 (ammonia-hydrogen peroxide mixture: ammonia hydrogen peroxide solution mixture) and the like.
- the organic solvent nozzle 13 is an example of a low surface tension liquid nozzle that supplies a low surface tension liquid to the upper surface of the substrate W.
- the low surface tension liquid nozzle is included in a low surface tension liquid supply unit that supplies the low surface tension liquid to the upper surface of the substrate W.
- the low surface tension liquid is not limited to IPA, and has a surface tension smaller than that of water, and does not chemically react with the upper surface of the substrate W and the pattern formed on the substrate W (see FIG. 16) (less reactive).
- Organic solvents other than IPA can be used. More specifically, a liquid containing at least one of IPA, HFE (hydrofluoroether), methanol, ethanol, acetone, and Trans-1,2 dichloroethylene can be used as the low surface tension liquid.
- the low surface tension liquid need not be composed of only a single component, and may be a liquid mixed with other components. For example, it may be a mixed liquid of IPA liquid and pure water, or a mixed liquid of IPA liquid and
- the processing unit 2 further includes a moving member 17 that supports the drying head 14 and a moving unit 15 that moves the moving member 17.
- the moving member 17 includes an arm extending in the horizontal direction.
- the moving unit 15 includes a rotating shaft 15a that extends in the vertical direction and is connected to the moving member 17, and a rotating shaft drive mechanism 15b that drives the rotating shaft 15a.
- the rotation shaft drive mechanism 15b swings the moving member 17 along the upper surface of the substrate W by rotating the rotation shaft 15a around the vertical rotation axis, and moves the rotation shaft 15a along the vertical direction. By moving up and down, the moving member 17 is moved up and down.
- the drying head 14 moves in the horizontal direction and the vertical direction according to the swinging and raising / lowering of the moving member 17.
- the rotating shaft drive mechanism 15b includes, for example, a ball screw mechanism (not shown), a first electric motor (not shown) that applies a driving force to the ball screw mechanism in order to move the rotating shaft 15a up and down, and a rotating shaft.
- the organic solvent nozzle 13 is fixed to the drying head 14. Specifically, referring also to FIGS. 3A and 3B to be described later, the organic solvent nozzle 13 is fixed in a through hole 14a penetrating the drying head 14 up and down with the discharge port 13a facing the upper surface of the substrate W. Has been. Therefore, the drying head 14 and the organic solvent nozzle 13 are supported by a common moving member 17 and are moved above the substrate W by the moving member 17.
- the organic solvent nozzle 13 is movable between a center position facing the rotation center of the upper surface of the substrate W and a home position (retreat position) not facing the upper surface of the substrate W.
- the center of rotation of the upper surface of the substrate W is an intersection position with the rotation axis A1 on the upper surface of the substrate W.
- the home position is a position outside the spin base 21 in plan view. More specifically, the home position may be a position outside the cup 8.
- the drying head 14 is movable between a central position that faces the rotation center of the upper surface of the substrate W and a home position (retreat position) that does not face the upper surface of the substrate W.
- the organic solvent nozzle 13 and the drying head 14 can move close to the upper surface of the substrate W or retreat upward from the upper surface of the substrate W by moving in the vertical direction.
- the organic solvent nozzle 13 is coupled to an organic solvent supply pipe 38 that supplies the organic solvent nozzle 13 with an organic solvent (IPA in this embodiment) as a low surface tension liquid.
- the organic solvent supply pipe 38 is provided with an organic solvent valve 39 for opening and closing the flow path.
- a third inert gas supply pipe 40 for supplying an inert gas such as nitrogen gas to the drying head 14 is coupled to the drying head 14.
- a third inert gas valve 41 that opens and closes the flow path is interposed in the third inert gas supply pipe 40.
- the drying head 14 is coupled to an exhaust pipe 42 that exhausts the interior of the drying head 14 and the vicinity thereof.
- An exhaust valve 49 for opening and closing the flow path is interposed in the exhaust pipe 42.
- FIG. 3A is a schematic longitudinal sectional view of the drying head 14, and FIG. 3B is a transverse sectional view taken along line IIIb-IIIb of FIG. 3A.
- the drying head 14 has, for example, a block shape.
- the drying head 14 has a longitudinal direction in the horizontal direction, and the size in the longitudinal direction is about 90 mm.
- the drying head 14 is opposed to the upper surface of the substrate W and has a facing surface 50 that is smaller in size in plan view than the substrate W.
- the facing surface 50 is recessed upward from the upper surface of the substrate W to form an inert gas storage space 51 in the drying head 14.
- the facing surface 50 includes a first surface 50 ⁇ / b> A configured by the lower surface of the drying head 14 and a second surface 50 ⁇ / b> B configured by the ceiling surface of the inert gas storage space 51.
- the drying head 14 includes an exhaust port 52 that exhausts the inert gas storage space 51, a plurality of inert gas introduction ports 53 formed on the ceiling surface of the inert gas storage space 51, and a plurality of inert gas introduction ports 53.
- an inert gas supply space 54 defined on the opposite side to the inert gas storage space 51 is included.
- the exhaust pipe 42 is connected to the exhaust port 52.
- a gas such as an organic solvent or an inert gas discharged from the exhaust port 52 is sent to the outside of the drying head 14 through the exhaust pipe 42.
- the above-described third inert gas supply pipe 40 is connected to the inert gas supply chamber 54.
- the inert gas supplied from the third inert gas supply pipe 40 to the inert gas supply chamber 54 diffuses in the inert gas supply chamber 54 and is inert at a uniform flow rate from the plurality of inert gas inlets 53. It is supplied to the gas storage space 51.
- the organic solvent in the space between the facing surface 50 and the upper surface of the substrate W is obtained by exhausting the inert gas storage space 51 through the exhaust port 52 and supplying the inert gas in the inert gas storage space 51.
- the gas concentration is reduced.
- a low humidity space B having a lower humidity than that outside the space is formed in the space between the facing surface 50 and the upper surface of the substrate W. Since the low-humidity space B promotes the evaporation of the organic solvent on the upper surface of the substrate W, the organic solvent on the upper surface of the substrate W can be efficiently dried.
- the drying head 14 is an example of a drying head that dries the upper surface of the substrate W. Therefore, the moving unit 15 functions as a drying head moving unit that moves the drying head 14 along the upper surface of the substrate W.
- the second surface 50B of the facing surface 50 has a substantially fan-shaped planar shape. Specifically, the sector formed by the second surface 50B of the facing surface 50 has a main 50a disposed at a position far from the through hole 14a through which the organic solvent nozzle 13 is inserted. The sector formed by the second surface 50B of the opposing surface 50 has an arc 50b disposed at a position closer to the through hole 14a than the main 50a.
- the inert gas storage space 51 has a substantially fan-shaped planar shape.
- a portion 51 a constituting the sector shape communicates with the exhaust port 52.
- the portion 51b constituting the fan-shaped arc is located closer to the exhaust port 52 than the organic solvent nozzle 13.
- FIG. 4 is a block diagram for explaining the electrical configuration of the main part of the substrate processing apparatus 1.
- the controller 3 includes a microcomputer and controls a control target provided in the substrate processing apparatus 1 according to a predetermined control program. More specifically, the controller 3 includes a processor (CPU) 3A and a memory 3B in which a control program is stored, and the processor 3A executes the control program to execute various controls for substrate processing. Is configured to do.
- the controller 3 includes a transfer robot IR, CR, an electric motor 23, a nozzle moving unit 29, a moving unit 15, a blocking plate lifting / lowering unit 28, a heater energizing mechanism 48, a heater lifting / lowering mechanism 26, and valves 31, 33, 36, and 37. , 39, 41, 44, 49, etc. are controlled.
- the controller 3 controls the drying head 14 by controlling the third inert gas valve 41 and the exhaust valve 49.
- FIG. 5 is a flowchart for explaining an example of the substrate processing by the substrate processing apparatus 1, and mainly shows processing realized by the controller 3 executing the operation program.
- the unprocessed substrate W is carried into the processing unit 2 from the carrier C by the transfer robots IR and CR, and delivered to the spin chuck 5 (S1). Thereafter, the substrate W is held horizontally by the spin chuck 5 until it is carried out by the transfer robot CR (substrate holding step).
- the chemical processing (S2) is started.
- the supply of the inert gas is started.
- the controller 3 opens the first inert gas valve 44 and supplies the inert gas from the inert gas nozzle 11 toward the upper surface of the substrate W.
- the flow rate of the inert gas at this time is a small flow rate.
- the small flow rate is a flow rate of less than 3 liters / min, for example.
- Controller 3 drives electric motor 23 to rotate spin base 21 at a predetermined chemical solution rotation speed.
- the controller 3 controls the shield plate lifting / lowering unit 28 to place the shield plate 7 in the upper position.
- the controller 3 controls the nozzle moving unit 29 to place the moving nozzle 12 at the chemical solution processing position above the substrate W.
- the chemical processing position may be a position where the chemical discharged from the moving nozzle 12 is deposited on the rotation center of the upper surface of the substrate W.
- the controller 3 opens the chemical liquid valve 36. Thereby, the chemical solution is supplied from the moving nozzle 12 toward the upper surface of the rotating substrate W. The supplied chemical solution spreads over the entire upper surface of the substrate W by centrifugal force.
- the DIW rinsing process (S3) for removing the chemical from the upper surface of the substrate W is performed by replacing the chemical on the substrate W with DIW.
- the controller 3 closes the chemical liquid valve 36 and opens the DIW valve 33 instead. Accordingly, DIW is supplied from the DIW nozzle 10 toward the upper surface of the rotating substrate W. The supplied DIW spreads over the entire upper surface of the substrate W by centrifugal force. The chemical solution on the substrate W is washed away by the DIW.
- the controller 3 controls the nozzle moving unit 29 to retract the moving nozzle 12 from above the substrate W to the side of the cup 8.
- the supply of the inert gas by the inert gas nozzle 11 and the rotation of the substrate W by the spin base 21 are continued.
- the inert gas is supplied at a small flow rate.
- the substrate W is rotated at a predetermined DIW rinse rotation speed.
- an organic solvent process is performed in which DIW on the substrate W is replaced with an organic solvent (for example, IPA) that is a low surface tension liquid having a surface tension lower than that of water.
- an organic solvent for example, IPA
- the substrate W may be heated while the organic solvent treatment is performed.
- the controller 3 controls the heater lifting mechanism 26 to place the heater mechanism 6 in the upper position.
- the controller 3 controls the heater energization mechanism 48 to energize the heater mechanism 6.
- the substrate W is heated.
- the substrate W does not necessarily have to be heated by the heater mechanism 6. That is, the controller 3 may heat the substrate W by opening the heating fluid valve 31 and supplying the heating fluid from the lower surface nozzle 9.
- the controller 3 controls the moving unit 15 to move the organic solvent nozzle 13 to the organic solvent rinsing position above the substrate W.
- the organic solvent rinsing position may be a position where an organic solvent (for example, IPA) discharged from the discharge port 13a of the organic solvent nozzle 13 is deposited on the rotation center of the upper surface of the substrate W.
- the controller 3 controls the shield plate lifting / lowering unit 28 to place the shield plate 7 at a processing position between the upper position and the lower position.
- the processing position is a position where the organic solvent nozzle 13 and the drying head 14 can move horizontally between the blocking plate 7 and the substrate W.
- the controller 3 closes the DIW valve 33 and opens the organic solvent valve 39. Thereby, the organic solvent is supplied from the organic solvent nozzle 13 toward the upper surface of the rotating substrate W. The supplied organic solvent spreads over the entire upper surface of the substrate W by centrifugal force, and replaces DIW on the substrate W.
- the water repellent was supplied to the upper surface of the substrate W using another nozzle (not shown) for supplying the water repellent to the substrate W, and the organic solvent was replaced with the water repellent. Thereafter, the water repellent may be replaced with an organic solvent.
- the controller 3 decelerates the rotation of the spin chuck 5 and stops the supply of the organic solvent. Thereby, a liquid film of an organic solvent is formed on the substrate W (liquid film forming step).
- the controller 3 controls the first inert gas valve 44 so that an inert gas is sprayed from the inert gas nozzle 11 toward the central region of the substrate W (inert gas spraying step).
- the inert gas nozzle 11 is included in the inert gas supply unit that blows the inert gas toward the central region of the organic solvent liquid film.
- the inert gas nozzle 11 is also included in an opening forming unit that forms an opening in the central region of the organic solvent liquid film.
- the central region of the organic solvent liquid film is a region that overlaps the central region of the upper surface of the substrate W in plan view.
- the organic solvent on the substrate W is discharged out of the substrate W (liquid film removing step).
- the controller 3 controls the electric motor 23 to rotate the substrate W in parallel with the liquid film removal process (substrate rotation process).
- the inert gas spraying process is continued until the liquid film removing process is completed.
- the opening is widened by the force applied to the organic solvent liquid film by blowing the inert gas and the centrifugal force generated by the rotation of the substrate W.
- the organic solvent liquid film is removed from the upper surface of the substrate W due to the widening of the opening.
- the controller 3 controls the moving unit 15 to move the organic solvent nozzle 13 and the drying head 14 toward the periphery of the substrate W.
- the controller 3 opens the organic solvent valve 39 to supply the organic solvent from the organic solvent nozzle 13 to the organic solvent liquid film, and opens the third inert gas valve 41 to remove the organic solvent liquid film and expose it.
- An upper surface of the substrate W is dried by supplying an inert gas to the upper surface of the substrate W. Further, the controller 3 opens the exhaust valve 49 to exhaust the inert gas storage space 51.
- the controller 3 closes the organic solvent valve 39, the third inert gas valve 41, and the exhaust valve 49. Thereafter, the controller 3 controls the moving unit 15 to retract the organic solvent nozzle 13 and the drying head 14 to the home position. Further, the controller 3 closes the first inert gas valve 44 and stops the supply of the inert gas from the inert gas nozzle 11. Then, the controller 3 controls the electric motor 23 to rotate the substrate W at a high speed at the drying rotation speed. Thereby, a drying process (S5: spin dry) for shaking off the liquid component on the substrate W by centrifugal force is performed.
- S5 spin dry
- the controller 3 controls the electric motor 23 to rotate the substrate W at a high speed at a predetermined drying rotation speed.
- the drying rotation speed is, for example, 800 rpm.
- the controller 3 controls the shield plate lifting unit 28 to move the shield plate 7 to the lower position.
- the electric motor 23 is controlled to stop the rotation of the spin chuck 5.
- the controller 3 controls the shield plate lifting / lowering unit 28 to retract the shield plate 7 to the upper position.
- the controller 3 closes the first inert gas valve 44 and stops the supply of the inert gas by the inert gas nozzle 11.
- the transfer robot CR enters the processing unit 2, picks up the processed substrate W from the spin chuck 5, and carries it out of the processing unit 2 (S 6).
- the substrate W is transferred from the transfer robot CR to the transfer robot IR, and is stored in the carrier C by the transfer robot IR.
- FIG. 6 is a time chart for explaining the details of the organic solvent treatment (S4 in FIG. 5).
- 7A to 7D are schematic cross-sectional views of the main part of the processing unit 2 for explaining the state of the organic solvent processing (S4 in FIG. 5).
- the organic solvent treatment includes an organic solvent rinsing step T1, a liquid film forming step T2, a drilling step T3, and a hole expanding step T4, which are sequentially executed.
- IPA nozzle position represents the position of the organic solvent nozzle 13
- IPA discharge represents the discharge state of the organic solvent from the organic solvent nozzle 13.
- Organic solvent rinsing step T1 is a step of supplying an organic solvent as a low surface tension liquid onto the upper surface of the substrate W while rotating the substrate W (low surface tension liquid supply step, liquid film formation step).
- an organic solvent for example, IPA
- the supplied organic solvent receives a centrifugal force and travels from the central region of the upper surface of the substrate W toward the periphery. Therefore, the DIW (rinsing liquid) supplied to the upper surface of the substrate W in the DIW rinsing process (S3 in FIG. 5) is completely replaced with the organic solvent.
- the controller 3 controls the blocking plate lifting / lowering unit 28 to place the blocking plate 7 at the processing position.
- the upper surface of the substrate W is covered with a blocking plate 7 located at the processing position. Therefore, the space between the blocking plate 7 and the upper surface of the substrate W is blocked from the external space. Therefore, it is possible to suppress or prevent the droplets bounced off the wall surface of the processing unit 2 or the mist in the atmosphere from adhering to the upper surface of the substrate W.
- the supply of the inert gas from the inert gas nozzle 11 at a small flow rate is continued.
- the substrate W is rotated by the spin chuck 5 at a predetermined organic solvent rinsing process speed.
- the organic solvent rinse treatment speed is, for example, 300 rpm.
- the organic solvent nozzle 13 is disposed at the center position.
- the center position is a position facing the substrate W from above on the rotation axis A1 of the substrate W.
- the organic solvent valve 39 is opened. Therefore, an organic solvent (for example, IPA) is supplied from above toward the rotation center of the upper surface of the substrate W.
- the moving nozzle 12 is retracted to the home position on the side of the cup 8.
- the chemical liquid valve 36 and the second inert gas valve 37 are controlled to be closed.
- the liquid film forming step T2 is a step of growing the film thickness of the liquid film M of the organic solvent by decelerating the rotation of the substrate W and reducing the amount of the organic solvent scattered from the substrate W. is there.
- a liquid film M having a large film thickness for example, a film thickness of 1 mm is formed on the surface of the substrate W.
- the rotation of the substrate W is decelerated stepwise or continuously from the organic solvent rinsing process speed. More specifically, the rotation speed of the substrate W is reduced from 300 rpm to 50 rpm and maintained for a predetermined time (for example, 10 seconds), and then reduced to 10 rpm and maintained for a predetermined time (for example, 30 seconds).
- the conditions other than the “substrate rotation speed” in FIG. 6 are maintained under the same conditions as the organic solvent rinsing step T1.
- the organic solvent nozzle 13 is held at the center position, and continuously supplies the organic solvent toward the rotation center of the upper surface of the substrate W. The supply of the organic solvent from the organic solvent nozzle 13 is continued until the liquid film forming step T2 is completed, so that the organic solvent is not lost everywhere on the upper surface of the substrate W.
- the drilling step T3 is a step of exposing the central region on the upper surface of the substrate W by opening a small opening H (for example, a diameter of about 30 mm) in the central region of the liquid film M (opening formation).
- a small opening H for example, a diameter of about 30 mm
- the inert gas for example, nitrogen gas
- H is formed (inert gas spraying step).
- the substrate W may be heated to evaporate the organic solvent in the central region, thereby forming the opening H in the central region of the liquid film M (opening forming step).
- the controller 3 opens the heating fluid valve 31 to supply the heating fluid from the lower surface nozzle 9 to the central region of the lower surface of the substrate W, whereby the substrate W is heated.
- the inert gas may not be sprayed onto the substrate W.
- the lower surface nozzle 9 can function as an opening forming unit that forms the opening H in the central region of the liquid film M.
- the opening H may be formed in the liquid film M by both blowing of an inert gas to the upper surface of the substrate W and heating of the central region of the lower surface of the substrate W by the heating fluid.
- the controller 3 controls the organic solvent valve 39 to stop the supply of the organic solvent from the organic solvent nozzle 13. Further, the blocking plate 7 is maintained at the processing position during the period of the drilling step T3.
- the controller 3 controls the moving unit 15 to place the organic solvent nozzle 13 and the drying head 14 at the drilling position.
- the perforation position is a position slightly shifted from the central region of the substrate W toward the peripheral side of the substrate W. Since the organic solvent nozzle 13 and the drying head 14 are positioned at the perforation position, the inert gas nozzle 11 allows the inert gas to flow into the central region of the liquid film M without being blocked by the organic solvent nozzle 13 and the drying head 14. Can be supplied.
- the drying head 14 is located below the inert gas nozzle 11, but in actuality, the perforation position is a position avoiding the central region on the upper surface of the substrate W to which the inert gas is blown from the inert gas nozzle 11. It is.
- the controller 3 controls the electric motor 23 to gradually accelerate the rotation of the spin base 21. Specifically, the rotation of the spin base 21 is accelerated until a predetermined opening formation speed is reached.
- the opening forming speed is, for example, 30 rpm.
- the opening forming speed is not limited to 30 rpm, and can be changed in a range of 10 rpm to 50 rpm.
- the hole expanding step T4 is a step of removing the liquid film M from the upper surface of the substrate W by expanding the opening H of the liquid film M by rotating the substrate W (liquid film removing step, Substrate rotation step).
- the substrate rotating process is executed in parallel with the liquid film removing process. That is, the rotation of the substrate W is maintained until the liquid film M is removed from the upper surface of the substrate W.
- the controller 3 controls the electric motor 23 to gradually decelerate until the rotation of the spin base 21 reaches a predetermined liquid film removal speed (rotational deceleration process).
- the liquid film removal speed is, for example, 10 rpm.
- the liquid film removal speed is not limited to 10 rpm, and can be changed in the range of 10 to 30 rpm.
- the inert gas spraying to the central region of the substrate W by the inert gas nozzle 11 is maintained (inert gas spraying step).
- the blowing of the inert gas by the inert gas nozzle 11 is continued until the liquid film M is removed from the upper surface of the substrate W, that is, until the liquid film removing step is completed.
- the controller 3 controls the organic solvent valve 39 to resume the supply of the organic solvent from the organic solvent nozzle 13 to the upper surface of the substrate W.
- the temperature of the organic solvent supplied from the organic solvent nozzle 13 (organic solvent temperature) is preferably higher than room temperature, for example, 50 ° C.
- the controller 3 sets the landing point P of the organic solvent supplied from the organic solvent nozzle 13 outside the opening H.
- the liquid landing point P is a point where the organic solvent supplied from the organic solvent nozzle 13 is deposited on the upper surface of the substrate W. Since the organic solvent nozzle 13 does not rotate around the rotation axis A1, the landing point P is relatively moved upstream in the substrate rotation direction S as the substrate W rotates.
- the outside of the opening H refers to the side opposite to the rotation axis A1 with respect to the peripheral edge H1 of the opening H.
- the controller 3 opens the first inert gas valve 44 and starts supplying the inert gas from the drying head 14 to the substrate W.
- the temperature of the inert gas supplied from the drying head 14 (inert gas temperature) is preferably higher than room temperature, for example, 50 ° C.
- the controller 3 opens the exhaust valve 49 and discharges the inert gas and the organic solvent vapor stored in the inert gas storage space 51 from the exhaust port 52.
- the controller 3 sets the drying region R inside the opening H.
- the drying region R is a region where the upper surface of the substrate W is to be dried inside the opening H.
- the drying region R is a region facing the facing surface 50 of the drying head 14 on the upper surface of the substrate W. That is, when the drying head 14 is positioned inside the outer periphery of the substrate W in plan view, the facing surface 50 of the drying head 14 faces the drying region R.
- the drying region R overlaps with the second surface 50B of the facing surface 50 of the drying head 14 in plan view. Since the drying head 14 does not rotate around the rotation axis A1, the drying region R is relatively moved upstream in the substrate rotation direction S as the substrate W rotates.
- the inside of the opening H refers to the rotation axis A1 side with respect to the peripheral edge H1 of the opening H.
- the concentration of the organic solvent gas is controlled.
- the low humidity space B is formed in the space between the opposing surface 50 and the dry region R.
- the controller 3 controls the moving unit 15 to move the organic solvent nozzle 13 in a state of discharging the organic solvent from the discharge port 13a from the hole forming position to the outer peripheral position.
- the liquid landing point P is moved so as to follow the spread of the opening H (liquid landing point moving step).
- the outer peripheral position is a position where the organic solvent nozzle 13 faces the peripheral edge of the substrate W.
- the landing point P preferably follows the opening H in the vicinity of the periphery H1 of the opening H.
- the controller 3 controls the moving unit 15 to move the drying head 14 from the drilling position to the outer peripheral position. Thereby, the opposing surface 50 and the dry area
- FIG. 8A is a plan view schematically showing the movement locus of the landing point P and the drying region R in the hole expanding step T4.
- 8B is an enlarged view of the periphery of the liquid spot P and the dry region R of FIG. 8A.
- the organic solvent liquid film M, the liquid landing point P, and the drying region R are hatched for the sake of clarity.
- the dry region R moves along the movement locus of the liquid landing point P (see the one-dot chain line in FIG. 8A) so as to follow the movement of the liquid landing point P (two points in FIG. 8A). (See chain line).
- the drying head 14 and the organic solvent nozzle 13 are moved, the drying region R may be set so that a region wider than half is located on the downstream side in the substrate rotation direction S with respect to the liquid landing point P. .
- the drying region R which is the region overlapping the second surface 50B in plan view, is substantially fan-shaped planar shape, similar to the second surface 50B of the opposing surface 50.
- the sector formed by the dry region R has a required Ra at a position far from the liquid landing point P.
- the sector formed by the dry region R has an arc Rb at a position closer to the liquid landing point P than the required Ra.
- a region wider than half of the arc Rb is arranged on the upstream side in the substrate rotation direction S with respect to Ra required.
- the arc Rb is located on the outer side (periphery side) of the substrate W with respect to Ra.
- the arc Rb is arranged along the substrate rotation direction S.
- the fan-shaped element 50 a of the second surface 50 ⁇ / b> B of the facing surface 50 is disposed far from the liquid landing point P.
- the fan-shaped arc 50b of the second surface 50B is disposed closer to the liquid landing point P than the required Ra, and is disposed along the substrate rotation direction S.
- the symbol Ra indicating the key of the second surface 50B is written together with the key Ra of the drying region R
- the symbol 50a indicating the arc of the second surface 50B is written together with the arc Rb of the drying region R.
- the low-humidity space B having a lower humidity than outside the space is present in the space between the facing surface 50 facing the drying region R set inside the opening H and the drying region R. It is formed. Therefore, the organic solvent in the dry region R can be quickly evaporated.
- the drying region R and the facing surface 50 follow the spread of the opening H. Therefore, the organic solvent remaining on the upper surface of the substrate W after the organic solvent liquid film M is removed can be quickly evaporated. Moreover, since the drying region R opposed to the facing surface 50 is relatively wide, the inert gas supplied from the drying head 14 does not cause a large external force to act on the upper surface of the substrate W locally.
- the facing surface 50 is smaller in size in plan view than the substrate W. Therefore, the facing surface 50 can be moved while the drying head 14 is disposed at a position where the organic solvent nozzle 13 is avoided, that is, a position sufficiently close to the upper surface of the substrate W. Thereby, the organic solvent remaining in the dry region R can be evaporated more rapidly.
- the drying region R is set inside the opening H, and the landing point P is set outside the opening H. Therefore, a sufficient amount of organic solvent can be supplied to the liquid film M while suppressing the natural evaporation of the organic solvent from the liquid film M until the liquid film M is removed from the upper surface of the substrate W. . Therefore, it is possible to prevent the liquid film M from locally evaporating and causing the liquid film to break before the liquid film M is eliminated by the spread of the opening H.
- the organic solvent can be well removed from the upper surface of the substrate W.
- the drying region R moves along the movement locus of the landing point P so as to follow the movement of the landing point P. For this reason, the organic solvent can be reliably evaporated by the drying head 14 before the organic solvent that has reached the landing point P evaporates naturally.
- the inert gas nozzle 11 blows the inert gas toward the central region of the liquid film M, so that the opening H can be efficiently and reliably formed in the central region.
- the blowing of the inert gas is continued until the liquid film removing process is completed. Thereby, the expansion of the opening H is promoted, and the organic solvent can be removed from the substrate W more quickly. Further, in the liquid film removing step, since the blocking plate 7 is located at the processing position, an air flow from the center of the substrate W toward the periphery of the substrate W can be formed above the substrate W. By forming such an air flow, even if the organic solvent jumps up from the liquid film M by the inert gas supplied from the drying head 14, it is possible to prevent the jumped-up organic solvent from falling inside the opening H. it can.
- the substrate rotation process for rotating the substrate W is executed in parallel with the liquid film removal process, the expansion of the opening H can be promoted by the centrifugal force generated by the rotation of the substrate W. As a result, the liquid film M can be removed from the substrate W more quickly.
- the landing point P scans the substrate W outside the opening H of the liquid film M, and the drying region R scans the substrate W inside the opening H. Thereby, a uniform drying process can be performed on the entire top surface of the substrate W.
- the drying region R is located near the central region on the upper surface of the substrate W.
- the opening H of the liquid film M is large, so that the drying region R is located near the periphery of the upper surface of the substrate W.
- the distance that the drying region R moves relative to the upper surface of the substrate W in the substrate rotation direction S per unit time at the final stage of the liquid film removal process is: In the initial stage of the film removal process, the distance in which the drying region R moves relative to the upper surface of the substrate W in the substrate rotation direction S per unit time becomes larger. Therefore, in the final stage of the liquid film removing process, the substrate upper surface drying time per unit area, that is, the time facing the facing surface 50 of the drying head 14 is shorter than in the initial stage of the liquid film removing process.
- the distance that the drying region R moves relative to the substrate rotation direction S per unit time in the final stage of the liquid film removal process is reduced, and the substrate per unit area is reduced.
- the upper surface drying time can be lengthened. Thereby, the difference in the substrate upper surface drying time per unit area can be reduced between the initial stage and the final stage of the liquid film removing process. Therefore, uneven drying on the upper surface of the substrate W can be reduced.
- the initial stage of the liquid film removal process and the final stage of the liquid film removal process are performed by gradually decelerating the rotation of the substrate W in the substrate rotation process.
- the difference in time during which the inert gas is sprayed on the upper surface of the substrate W per unit area can be reduced.
- drying region R is set so that a region wider than half is located on the downstream side in the substrate rotation direction S with respect to the liquid landing point P. Therefore, the organic solvent deposited on the landing point P can be more reliably evaporated before it spontaneously evaporates.
- the fan-shaped element Ra is arranged at a position far from the liquid landing point P, and the fan-shaped arc Rb is close to the liquid landing point P and along the substrate rotation direction S. Is arranged.
- the fan-shaped arc Rb is located closer to the periphery of the substrate W than the required Ra, so that the time during which each portion of the upper surface of the substrate W faces the facing surface 50 of the drying head 14, that is, the difference in drying time is reduced. Can do. Therefore, uneven drying on the upper surface of the substrate W can be reduced.
- the distance between the organic solvent nozzle 13 and the drying head 14 is moved by moving the moving member 17 that commonly supports the organic solvent nozzle 13 and the drying head 14 in the liquid landing point moving step and the drying region moving step. Is kept constant. Therefore, since the entire upper surface of the substrate W can be dried under uniform conditions, drying unevenness can be reduced.
- the drying head 14 is an inert gas supply head, the humidity of the low humidity space B can be reduced by the inert gas. Thereby, since the organic solvent can be quickly evaporated from the drying region R, the upper surface of the substrate W can be quickly dried.
- the opposing surface 50 is recessed upward from the upper surface of the substrate W to form an inert gas storage space 51.
- the inert gas supplied from the inert gas inlet 53 is stored. Therefore, the organic solvent remaining on the upper surface of the substrate W can be evaporated by the inert gas stored in the inert gas storage space 51. Therefore, the organic solvent can be evaporated more rapidly.
- the exhaust port 52 exhausts the inert gas storage space 51.
- the organic solvent evaporated from the upper surface of the substrate W into vapor is excluded from the low humidity space B through the inert gas storage space 51.
- the organic solvent in the dry region R can be evaporated more rapidly.
- FIG. 9 is a schematic cross-sectional view showing the drying head 14P provided in the processing unit 2P according to the first modification of the first embodiment.
- the same members as those described so far are denoted by the same reference numerals, and the description thereof is omitted.
- the drying head 14P according to the first modification of the first embodiment is mainly different from the drying head 14 according to the first embodiment (see FIGS. 3A and 3B) in that the drying head 14P has an inert gas inlet 53.
- a heater unit 55 for heating the upper surface (dry region R) of the substrate W is included.
- the opposing surface 50P is recessed upward from the upper surface of the substrate W to form a drying chamber 59 instead of the inert gas storage space 51 (see FIG. 3A).
- the facing surface 50P includes a first surface 50PA configured by the lower surface of the drying head 14P and a second surface 50PB configured by the ceiling surface of the drying chamber 59.
- the second surface 50PB of the facing surface 50P may have a substantially fan-shaped planar shape.
- the sector formed by the second surface 50PB of the opposing surface 50P has a sector-shaped main 50a arranged at a position far from the through hole 14a.
- the sector formed by the second surface 50PB of the facing surface 50P has an arc 50b arranged at a position closer to the through hole 14a than the main 50a.
- the second surface 50PB overlaps the dry region R in plan view.
- the drying head 14 ⁇ / b> P includes an exhaust port 59 ⁇ / b> A that exhausts the inside of the drying chamber 59.
- the exhaust port 59 ⁇ / b> A is connected to the exhaust pipe 42.
- the heater unit 55 is disposed on the ceiling of the drying chamber 59, for example.
- the lower surface of the heater unit 55 may constitute a part of the second surface 50PB of the facing surface 50P.
- the heater unit 55 includes a resistor that increases in temperature when energized. Electric power from the heater energization unit 57 is supplied to the heater unit 55 through a power supply line 56.
- evaporation of the organic solvent in the dry region R can be further promoted by heating the substrate W by the heater unit 55.
- FIG. 10 is a schematic cross-sectional view showing the drying head 14U provided in the processing unit 2U according to the second modification of the first embodiment.
- the main difference between the drying head 14U of the second modified example and the drying head 14P of the first modified example is that the facing surface 50U of the drying head 14U is not recessed and the drying chamber 59 (see FIG. 9) is not formed. Is a point.
- the facing surface 50U is constituted by the lower surface of the heater unit 55U.
- the facing surface 50U includes a facing portion 50UB that faces the drying region R on the heater unit 55U side with respect to the through hole 14a through which the organic solvent nozzle 13 is inserted.
- the facing portion 50UB may have a substantially fan-shaped planar shape.
- the sector formed by the facing portion 50UB has a main 50a arranged at a position far from the through hole 14a.
- the sector formed by the facing portion 50UB has an arc 50b disposed at a position closer to the through hole 14a than the main 50a.
- the facing portion 50UB overlaps the drying region R in plan view.
- the heater unit 55U can be disposed at a position closer to the upper surface of the substrate W to heat the substrate W, thereby further promoting the evaporation of the organic solvent in the dry region R.
- FIG. 11 is a diagram showing a drying head 14Q included in the processing unit 2Q according to the third modification of the first embodiment.
- the drying head 14Q includes the plurality of inert gas introduction ports 53 and the inert gas supply chamber 54 shown in the first embodiment, and includes the heater unit 55 shown in the first modification.
- the drying head 14 ⁇ / b> Q is an inert gas head having the heater unit 55. According to this configuration, the evaporation of the organic solvent in the dry region R can be further promoted by reducing the humidity of the low-humidity space B by the inert gas in the inert gas storage space 51 and heating by the heater unit 55. .
- FIG. 12 is a schematic cross-sectional view showing a drying head 14R provided in a processing unit 2R according to a fourth modification of the first embodiment.
- the main difference between the drying head 14R according to the fourth modification of the first embodiment and the drying head 14 according to the first embodiment (see FIGS. 3A and 3B) is that the drying head 14R has an exhaust port 52, an inactive state.
- an exhaust unit 58 that exhausts the space between the facing surface 50 and the upper surface (dry region R) of the substrate W is included.
- a drying chamber 59R is formed instead of the inert gas storage space 51 (see FIG. 3A).
- the drying chamber 59R is formed by the opposing surface 50R being recessed upward from the upper surface of the substrate W.
- the facing surface 50R includes a first surface 50RA configured by the lower surface of the drying head 14R and a second surface 50RB configured by the ceiling surface of the drying chamber 59R.
- the second surface 50RB of the facing surface 50R may have a substantially fan-shaped planar shape.
- the sector formed by the second surface 50RB of the facing surface 50R has a main 50a arranged at a position far from the through hole 14a.
- the sector formed by the second surface 50RB of the facing surface 50R has an arc 50b arranged at a position closer to the through hole 14a than the main 50a.
- the second surface 50RB overlaps the dry region R in plan view.
- the drying head 14R includes an exhaust port 59RA that exhausts the inside of the drying chamber 59R.
- the exhaust port 59RA is formed in, for example, the second surface 50RB.
- the exhaust port 59RA is connected to the exhaust pipe. According to this configuration, the vapor of the organic solvent can be removed from the low-humidity space B by the exhaust unit 58 that exhausts the space between the facing surface 50R and the drying region R. Therefore, the organic solvent in the dry region R can be evaporated more rapidly.
- FIG. 13 is a schematic cross-sectional view showing a drying head 14S provided in a processing unit 2S according to a fifth modification of the first embodiment.
- the drying head 14S according to the fifth modification of the first embodiment is mainly different from the drying head 14 according to the first embodiment (see FIGS. 3A and 3B) in that the facing surface 50S is parallel to the upper surface of the substrate W. This is a flat surface, and a plurality of inert gas discharge ports 60 are formed on the opposing surface 50S.
- the drying head 14S does not include the exhaust port 52, the inert gas introduction port 53, and the inert gas supply chamber 54, and the inert gas is the third inert gas. It is directly supplied from the active gas supply pipe 40 to the inert gas storage space 51.
- the facing surface 50S is constituted by the lower surface of the drying head 14S.
- the facing surface 50 ⁇ / b> S includes a facing portion 50 ⁇ / b> SB that faces the drying region R on the inert gas discharge port 60 side of the through hole 14 a through which the organic solvent nozzle 13 is inserted.
- the facing portion 50SB may have a substantially fan-shaped planar shape.
- the sector formed by the facing portion 50SB has a main 50a disposed at a position far from the through hole 14a.
- the sector formed by the facing portion 50SB has an arc 50b arranged at a position closer to the through hole 14a than the main 50a.
- the facing portion 50SB overlaps the dry region R in plan view.
- the plurality of inert gas discharge ports 60 are formed on the facing surface 50 ⁇ / b> S that is a flat surface parallel to the upper surface of the substrate W.
- An inert gas is supplied from an inert gas introduction port 53 to the inert gas storage space 51 communicating with the plurality of inert gas discharge ports 60. Therefore, as compared with the case where the inert gas is supplied from one discharge port, the inert gas can be supplied uniformly over a wide range, so that the humidity unevenness in the low humidity space B can be reduced. Therefore, the organic solvent in the dry region R can be quickly evaporated, and uneven drying on the upper surface of the substrate W can be reduced.
- FIG. 14 is an illustrative sectional view for explaining a configuration example of the processing unit 2T provided in the substrate processing apparatus 1T according to the second embodiment of the present invention.
- FIG. 15 is a plan view schematically showing the movement locus of the landing point P and the drying region R in the hole expanding step T4 (see FIGS. 6 and 7D).
- the main difference between the processing unit 2T according to the second embodiment and the processing unit 2 according to the first embodiment is that the organic solvent nozzle 13T and the drying head 14T can move independently in the horizontal and vertical directions. It is a point.
- the processing unit 2 supports the moving member 17T that supports the drying head 14T, the moving unit 15T that moves the moving member 17T, and the organic solvent nozzle 13T that moves the organic solvent nozzle 13T in the horizontal and vertical directions.
- An organic solvent nozzle moving unit 18 The organic solvent nozzle 13T is an example of a low surface tension liquid nozzle that supplies a low surface tension liquid to the upper surface of the substrate W.
- the moving unit 15T that moves the moving member 17T that supports the drying head 14T functions as a drying head moving unit that moves the drying head 14T along the upper surface of the substrate W.
- the organic solvent nozzle 13 ⁇ / b> T is moved in the horizontal direction by the organic solvent nozzle moving unit 18, so that a position facing the rotation center of the upper surface of the substrate W and a home position (retreat position) not facing the upper surface of the substrate W are set. Can move between.
- the home position is a position outside the spin base 21 in a plan view, and more specifically, may be a position outside the cup 8.
- the moving nozzle 12 can be moved closer to the upper surface of the substrate W or retreated upward from the upper surface of the substrate W by moving in the vertical direction.
- the organic solvent nozzle moving unit 18 includes, for example, a rotating shaft extending in the vertical direction, an arm coupled to the rotating shaft and extending horizontally, and an arm driving mechanism that drives the arm.
- the drying head 14T has the same configuration as the drying head 14 of the first embodiment (see FIGS. 3A and 3B) except that the through hole 14a is not provided.
- the controller 3 controls the moving unit 15T to move the drying head 14T, and the controller 3 moves the organic solvent nozzle moving unit 18 to move the organic solvent nozzle 13T. Is substantially the same as the substrate processing by the substrate processing apparatus 1 of the first embodiment except for the point of controlling (see FIG. 4).
- each of the organic solvent nozzle 13T and the drying head 14T can move independently in the horizontal direction and the vertical direction, in the hole expanding step T4 of the second embodiment, unlike the first embodiment, the drying region R It is also possible to move the drying region R so as not to follow the movement of the liquid landing point P (see FIG. 15).
- the controller 3 controls the organic solvent nozzle moving unit 18 to move the organic solvent nozzle 13T in a state in which the organic solvent is being discharged from the discharge port 13Ta from the drilling position to the outer peripheral position.
- the liquid landing point P is moved so as to follow the spread (liquid landing point moving step).
- the controller 3 controls the moving unit 15T to move the drying head 14T from the drilling position to the outer peripheral position, so that the facing surface 50 and the drying region R do not follow the liquid landing point P, and the opening Move so as to follow the spread of H (dry region moving step).
- the drying region R can be moved along the movement path of the liquid landing point P so that the drying region R follows the movement of the liquid landing point P. (See FIG. 8A).
- the inert gas blowing process is continued until the liquid film removing process is completed, but this is not always necessary. That is, after the inert gas nozzle 11 blows the inert gas toward the central region of the substrate W to form the opening H in the liquid film M, the controller 3 closes the first inert gas valve 44 and the inert gas nozzle 11. The supply of the inert gas from may be stopped.
- the substrate W is rotated in the hole expanding step T4.
- the opening H can be widened by any one of these heating methods, or a combination thereof.
- the second surfaces 50B, 50PB, 50RB of the facing surfaces 50, 50P, 50R and the facing portions 50UB, 50SB do not necessarily have a fan-like planar shape, and the shapes can be changed as appropriate. Is possible.
- drying region R is set so that a region wider than half is located on the downstream side in the substrate rotation direction S with respect to the liquid deposition point P, the drying region R is not necessarily required. There may be a case where an area wider than half is located upstream of the liquid point P in the substrate rotation direction S.
- the configuration of the drying head is not limited to the drying heads 14, 14P, 14U, 14Q, 14R, 14S, and 14T.
- the drying heads 14, 14P, and 14Q may not include the exhaust port 52.
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Abstract
Description
図1は、この発明の第1実施形態に係る基板処理装置1の内部のレイアウトを説明するための図解的な平面図である。基板処理装置1は、シリコンウエハ等の基板Wを一枚ずつ処理する枚葉式の装置である。この実施形態では、基板Wは、円形状の基板である。基板Wの直径は例えば300mmである。基板Wの表面には、微細なパターン(図16参照)が形成されている。基板処理装置1は、処理液で基板Wを処理する複数の処理ユニット2と、処理ユニット2で処理される複数枚の基板Wを収容するキャリヤCが載置されるロードポートLPと、ロードポートLPと処理ユニット2との間で基板Wを搬送する搬送ロボットIRおよびCRと、基板処理装置1を制御するコントローラ3とを含む。搬送ロボットIRは、キャリヤCと搬送ロボットCRとの間で基板Wを搬送する。搬送ロボットCRは、搬送ロボットIRと処理ユニット2との間で基板Wを搬送する。複数の処理ユニット2は、例えば、同様の構成を有している。
<第2実施形態>
図14は、本発明の第2実施形態に係る基板処理装置1Tに備えられた処理ユニット2Tの構成例を説明するための図解的な断面図である。図15は、穴広げステップT4(図6および図7D参照)における着液点Pおよび乾燥領域Rの移動軌跡を模式的に示した平面図である。第2実施形態に係る処理ユニット2Tが第1実施形態に係る処理ユニット2と主に異なる点は、有機溶剤ノズル13Tと乾燥ヘッド14Tとのそれぞれが、独立して水平方向および垂直方向に移動可能な点である。
1T 基板処理装置
3 制御ユニット
9 下面ノズル(開口形成ユニット)
11 移動ノズル(開口形成ユニット、不活性ガス供給ユニット)
13 有機溶剤ノズル(低表面張力液体ノズル、低表面張力液体供給ユニット)
13T 有機溶剤ノズル(低表面張力液体ノズル、低表面張力液体供給ユニット)
14 乾燥ヘッド(不活性ガスヘッド)
14P 乾燥ヘッド
14Q 乾燥ヘッド(不活性ガスヘッド)
14R 乾燥ヘッド
14S 乾燥ヘッド(不活性ガスヘッド)
14T 乾燥ヘッド(不活性ガスヘッド)
14U 乾燥ヘッド
15 移動ユニット(乾燥ヘッド移動ユニット)
15T 移動ユニット(乾燥ヘッド移動ユニット)
17 移動部材
17T 移動部材
20 チャックピン(基板保持ユニット)
21 スピンベース(基板保持ユニット)
22 回転軸(基板回転ユニット)
23 電動モータ(基板回転ユニット)
50 対向面
50a 要
50b 弧
50P 対向面
50Q 対向面
50R 対向面
50S 対向面
50T 対向面
50U 対向面
51 不活性ガス貯留空間
52 排気口
53 不活性ガス導入口
55 ヒータユニット
58 排気ユニット
60 不活性ガス吐出口
A1 回転軸線
B 低湿度空間
H 開口
M 液膜
Claims (29)
- 基板を水平に保持する基板保持工程と、
前記水平に保持された基板の上面に、水よりも表面張力の低い低表面張力液体の液膜を形成する液膜形成工程と、
前記低表面張力液体の液膜の中央領域に開口を形成する開口形成工程と、
前記開口を広げることによって、前記基板の上面から前記液膜を排除する液膜排除工程と、
低表面張力液体を供給する低表面張力液体ノズルから前記開口の外側に設定した着液点に向けて低表面張力液体を前記液膜に供給しながら、前記開口の広がりに追従するように前記着液点を移動させる着液点移動工程と、
前記開口の内側に設定された乾燥領域に、前記基板よりも平面視サイズの小さな対向面を有する乾燥ヘッドの前記対向面を対向させて前記対向面と前記乾燥領域との間の空間にその空間外よりも低湿度の低湿度空間を形成しながら、前記乾燥領域および前記対向面を前記開口の広がりに追従するように移動させる乾燥領域移動工程とを含む、基板処理方法。 - 前記乾燥領域移動工程は、前記着液点の移動に追従するように、前記着液点の移動軌跡に沿って前記乾燥領域を移動させる工程を含む、請求項1に記載の基板処理方法。
- 前記開口形成工程が、前記基板の中央領域に向けて不活性ガスを吹き付ける不活性ガス吹き付け工程を含み、
前記不活性ガス吹き付け工程が、前記液膜排除工程が完了するまで継続される、請求項1または2に記載の基板処理方法。 - 前記液膜排除工程と並行して前記基板を回転させる基板回転工程をさらに含む、請求項1~3のいずれか一項に記載の基板処理方法。
- 前記基板回転工程が、前記基板の回転を徐々に減速させる回転減速工程を含む、請求項4に記載の基板処理方法。
- 前記乾燥領域が、前記着液点に対して基板回転方向下流側に半分よりも広い領域が位置するように設定される、請求項4または5に記載の基板処理方法。
- 前記乾燥領域が、扇形の平面形状を有しており、前記扇形の要が前記着液点から遠い位置に配置され、前記扇形の弧が前記着液点に近くかつ基板回転方向に沿うように配置されている、請求項4~6のいずれか一項に記載の基板処理方法。
- 前記低表面張力液体ノズルと前記乾燥ヘッドとが共通の移動部材に支持されており、
前記着液点移動工程および前記乾燥領域移動工程が、前記移動部材を移動させる工程を含む、請求項1~7のいずれか一項に記載の基板処理方法。 - 前記乾燥ヘッドが、不活性ガスを供給する不活性ガス供給ヘッドである、請求項1~8のいずれか一項に記載の基板処理方法。
- 前記対向面が、基板の上面から上方に窪んで不活性ガス貯留空間を形成しており、前記不活性ガス供給ヘッドが、前記不活性ガス貯留空間に不活性ガスを供給する不活性ガス導入口を含む、請求項9に記載の基板処理方法。
- 前記不活性ガス供給ヘッドが、前記不活性ガス貯留空間を排気する排気口をさらに含む、請求項10に記載の基板処理方法。
- 前記対向面が、基板の上面に平行な平坦面であり、前記対向面に複数の不活性ガス吐出口が形成されており、
前記不活性ガス供給ヘッドが、前記複数の不活性ガス吐出口に連通する不活性ガス貯留空間と、前記不活性ガス貯留空間に不活性ガスを供給する不活性ガス導入口とを含む、請求項9に記載の基板処理方法。 - 前記乾燥ヘッドが、前記乾燥領域を加熱するヒータユニットを含む、請求項1~12のいずれか一項に記載の基板処理方法。
- 前記乾燥ヘッドが、前記対向面と前記乾燥領域との間の空間を排気する排気ユニットを含む、請求項1~13のいずれか一項に記載の基板処理方法。
- 基板を水平に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た基板の上面に水よりも表面張力の低い低表面張力液体を供給する低表面張力液体供給ユニットと、
前記基板保持ユニットに保持された基板の上面に形成される前記低表面張力液体の液膜の中央領域に開口を形成する開口形成ユニットと、
前記基板保持ユニットに保持された基板の上面に対向し、基板よりも平面視サイズの小さな対向面を有し、前記対向面と基板の上面との間の空間にその空間外よりも低湿度の低湿度空間を形成することによって基板の上面を乾燥させる乾燥ヘッドと、
前記基板保持ユニットに保持された基板の上面に沿って前記乾燥ヘッドを移動させる乾燥ヘッド移動ユニットとを含む、基板処理装置。 - 前記低表面張力液体供給ユニット、前記開口形成ユニット、前記乾燥ヘッドおよび前記乾燥ヘッド移動ユニットを制御するコントローラをさらに含み、
前記コントローラが、前記低表面張力液体供給ユニットから基板の上面に低表面張力液体を供給させ、前記基板の上面に低表面張力液体の液膜を形成する液膜形成工程と、前記開口形成ユニットにより前記液膜の中央領域に開口を形成する開口形成工程と、前記開口を広げることによって前記基板の上面から前記液膜を排除する液膜排除工程と、前記低表面張力液体供給ユニットから供給される低表面張力液体の着液点を前記開口の外側に設定して前記開口の広がりに追従するように前記着液点を移動させる着液点移動工程と、前記開口の内側に設定した乾燥領域に前記乾燥ヘッドの前記対向面を対向させ、前記開口の広がりに追従するように前記乾燥領域および前記対向面を移動させる乾燥領域移動工程とを実行するようにプログラムされている、請求項15に記載の基板処理装置。 - 前記コントローラが、前記乾燥領域移動工程において、前記着液点の移動に追従するように、前記着液点の移動軌跡に沿って前記乾燥領域を移動させる工程を実行するようにプログラムされている、請求項16に記載の基板処理装置。
- 前記開口形成ユニットが、前記基板保持ユニットに保持された基板の中央領域に向けて不活性ガスを吹き付ける不活性ガス供給ユニットを含み、
前記コントローラが、前記開口形成工程において、前記不活性ガス供給ユニットから不活性ガスを供給させる不活性ガス吹き付け工程を実行し、かつ、前記液膜排除工程が完了するまで前記不活性ガス吹き付け工程を継続するようにプログラムされている、請求項16または17に記載の基板処理装置。 - 前記基板保持ユニットに保持された基板を鉛直方向に沿う所定の回転軸線まわりに回転させる基板回転ユニットをさらに含み、
前記コントローラが、前記液膜排除工程と並行して前記基板を回転させる基板回転工程を実行するようにプログラムされている、請求項16~18のいずれか一項に記載の基板処理装置。 - 前記コントローラが、前記基板回転工程において、基板の回転を徐々に減速させる回転減速工程を実行するようにプログラムされている、請求項19に記載の基板処理装置。
- 前記コントローラは、前記着液点に対して基板回転方向下流側に半分よりも広い領域が位置するように前記乾燥領域を設定するようにプログラムされている、請求項19または20に記載の基板処理装置。
- 前記対向面が、扇形の平面形状を有しており、前記扇形の要が前記着液点から遠い位置に配置され、前記着液点に近くかつ基板回転方向に沿うように配置されている、請求項19~21のいずれか一項に記載の基板処理装置。
- 前記低表面張力液体供給ユニットが、前記基板保持ユニットに保持された基板の上面に向けて低表面張力液体を供給する低表面張力液体ノズルを含み、
前記低表面張力液体ノズルと前記乾燥ヘッドとを共通に支持し、前記低表面張力液体ノズルおよび前記乾燥ヘッドを前記基板の上方で移動させる移動部材をさらに含み、
前記乾燥ヘッド移動ユニットが、前記移動部材を移動させる、請求項15~22のいずれか一項に記載の基板処理装置。 - 前記乾燥ヘッドが、不活性ガスを供給する不活性ガス供給ヘッドである、請求項15~23のいずれか一項に記載の基板処理装置。
- 前記対向面が、前記基板保持ユニットに保持された基板の上面から上方に窪んで不活性ガス貯留空間を形成しており、前記不活性ガス供給ヘッドが、前記不活性ガス貯留空間に不活性ガスを供給する不活性ガス導入口を含む、請求項24に記載の基板処理装置。
- 前記不活性ガス供給ヘッドが、前記不活性ガス貯留空間を排気する排気口をさらに含む、請求項25に記載の基板処理装置。
- 前記対向面が、基板の上面に平行な平坦面であり、前記対向面に複数の不活性ガス吐出口が形成されており、
前記不活性ガス供給ヘッドは、前記複数の不活性ガス吐出口に連通する不活性ガス貯留空間と、前記不活性ガス貯留空間に不活性ガスを供給する不活性ガス導入口とを含む、請求項24に記載の基板処理装置。 - 前記乾燥ヘッドが、前記基板保持ユニットに保持された基板の上面を加熱するヒータユニットを含む、請求項15~27のいずれか一項に記載の基板処理装置。
- 前記乾燥ヘッドが、前記対向面と前記基板保持ユニットに保持された基板の上面との間の空間を排気する排気ユニットを含む、請求項15~27のいずれか一項に記載の基板処理装置。
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US20210151334A1 (en) | 2021-05-20 |
KR102118274B1 (ko) | 2020-06-02 |
TW201802919A (zh) | 2018-01-16 |
US10964558B2 (en) | 2021-03-30 |
JP6672023B2 (ja) | 2020-03-25 |
CN108604546A (zh) | 2018-09-28 |
KR20180098656A (ko) | 2018-09-04 |
US11501985B2 (en) | 2022-11-15 |
CN108604546B (zh) | 2022-12-02 |
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