WO2018124211A1 - 基板処理装置及び基板処理方法 - Google Patents
基板処理装置及び基板処理方法 Download PDFInfo
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- WO2018124211A1 WO2018124211A1 PCT/JP2017/047028 JP2017047028W WO2018124211A1 WO 2018124211 A1 WO2018124211 A1 WO 2018124211A1 JP 2017047028 W JP2017047028 W JP 2017047028W WO 2018124211 A1 WO2018124211 A1 WO 2018124211A1
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- substrate
- cleaning
- semiconductor wafer
- cleaned
- cleaning brush
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
- H01L21/6704—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing
- H01L21/67046—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing using mainly scrubbing means, e.g. brushes
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- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
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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
- H01L21/02096—Cleaning only mechanical cleaning
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68764—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a movable susceptor, stage or support, others than those only rotating on their own vertical axis, e.g. susceptors on a rotating caroussel
Definitions
- the present invention relates to a substrate processing apparatus and a substrate processing method for cleaning a substrate such as a semiconductor wafer or a liquid crystal substrate using a cleaning brush.
- a lithography process in which a circuit pattern is formed on a semiconductor wafer or glass substrate as a substrate.
- a resist is applied to a semiconductor wafer, light is irradiated through a mask in which a circuit pattern is formed on the resist, and then a portion of the resist not irradiated with light (or a portion irradiated with light) is removed. Then, the circuit pattern is formed by repeating a series of steps of processing the removed portion several tens of times.
- a batch type in which a plurality of semiconductor wafers are immersed in a cleaning tank in which a cleaning liquid is stored for cleaning, a single substrate is rotated, and the cleaning liquid is sprayed onto the substrate.
- a single wafer type for cleaning and a single wafer type having a high cleaning effect tends to be used with an increase in the size of the substrate.
- the single wafer type substrate processing apparatus includes a spin type substrate processing apparatus that rotates and cleans a semiconductor wafer.
- this substrate processing apparatus in order to further improve the cleaning effect, the upper surface of the rotated semiconductor wafer is provided.
- a cleaning brush that is driven to rotate is brought into contact, and a cleaning liquid (water, ultrapure water, or the like) is supplied to the contact portion to scrub the semiconductor wafer.
- a cleaning brush a PVA brush, a bristle brush or the like is used as the cleaning brush.
- the substrate processing apparatus described above has the following problems. That is, in recent years, with higher miniaturization of semiconductor devices, higher cleanliness has been demanded. In addition to contact cleaning, chemicals (ammonia, sulfuric acid, hydrogen peroxide, ozone water, ammonia and hydrogen peroxide water) are used as cleaning liquids. In combination with chemical chemical cleaning using a mixed liquid (APM), a mixed liquid of hydrochloric acid and hydrogen peroxide (SC-2), a surfactant, and the like). Furthermore, it is also practiced to heat the chemical solution / water / ultra pure water to increase the ability to remove particles. However, since the main component of the cleaning brush is inferior in heat resistance and chemical resistance, there is a problem that the type and temperature of the cleaning liquid are limited and the cleanliness cannot be increased.
- the substrate processing apparatus and the substrate processing method of the present invention are configured as follows.
- a holding unit capable of holding the substrate and a surface to be cleaned of the substrate held by the holding unit are arranged to face each other, and the porous fluororesin fibers are arranged as described above.
- a cleaning brush formed in a direction perpendicular to the surface of the substrate; a drive source that rotates the normal direction of the surface to be cleaned of the substrate held by the holding unit as a substrate rotation axis; and And a supply unit that supplies a cleaning liquid to the surface to be cleaned of the substrate held by the holding unit.
- a cleaning liquid is supplied to the surface to be cleaned of the substrate held by a holding unit, and is disposed opposite to the surface to be cleaned of the substrate held by the holding unit.
- the fluororesin fiber is contacted with a cleaning brush formed in a direction perpendicular to the surface to be processed of the substrate, and the holding portion is set to the substrate rotation axis as the normal direction of the surface to be cleaned of the substrate. Rotating drive.
- the present invention it is possible to provide a substrate processing apparatus and a substrate processing method capable of performing cleaning with high cleanliness.
- FIG. 1A is a longitudinal sectional view showing a substrate processing apparatus according to a first embodiment of the present invention.
- FIG. 1B is a perspective view showing a main part of the substrate processing apparatus by cutting.
- FIG. 2 is a plan view showing a cleaning unit incorporated in the substrate processing apparatus.
- FIG. 3 is an explanatory view schematically showing a relationship between a cleaning brush provided in the cleaning section and a semiconductor wafer.
- FIG. 4 is an enlarged side view showing a main part of the cleaning brush.
- FIG. 5 is an explanatory view schematically showing the relationship between the cleaning brush unit of the comparative example and the semiconductor wafer when provided in the cleaning section.
- FIG. 6 is an enlarged side view showing a main part of the cleaning brush of the comparative example.
- FIG. 1A is a longitudinal sectional view showing a substrate processing apparatus according to a first embodiment of the present invention.
- FIG. 1B is a perspective view showing a main part of the substrate processing apparatus by cutting.
- FIG. 2 is
- FIG. 7 is an explanatory diagram showing the removal rate for each particle size in the PTFE fiber direction of the cleaning brush and the cleaning brush of the comparative example.
- FIG. 8 is a perspective view showing a modified example of the cleaning brush unit.
- FIG. 9 is a perspective view showing another modified example of the cleaning brush unit.
- FIG. 10 is a longitudinal sectional view showing a substrate processing apparatus according to the second embodiment of the present invention.
- FIG. 11 is a cross-sectional view showing the substrate processing apparatus.
- FIG. 12 is a cross-sectional view showing a cleaning brush incorporated in the substrate processing apparatus.
- FIG. 1A is a longitudinal sectional view showing a substrate processing apparatus 10 according to the first embodiment of the present invention
- FIG. 1B is a perspective view showing a main part of the substrate processing apparatus 10 by cutting
- 2 is a plan view showing a cleaning unit incorporated in the substrate processing apparatus 10.
- FIG. 3 is an explanatory diagram schematically showing the relationship between the cleaning brush unit 41 provided in the cleaning unit and the semiconductor wafer W.
- FIG. 5 is an explanatory view schematically showing the relationship between the cleaning brush unit 41 of the comparative example provided in the cleaning part and the semiconductor wafer W
- FIG. 6 is a comparison.
- FIG. 7 is an explanatory view showing the removal rate for each particle size depending on the PTFE fiber direction of the cleaning brush 41a and the cleaning brush 41A of the comparative example.
- Pa represents particles having a particle size (particle size) of 10 nm to less than 50 nm
- Pb represents particles having a particle size of 50 nm to 80 nm.
- the particles Pa and Pb are dust adhering to the semiconductor wafer W and include not only those that are simply placed on the surface of the semiconductor wafer W but also those that are caught on the semiconductor wafer W substrate. For this reason, it has the property that it cannot be removed only by the force of the momentum generated by flowing water over the semiconductor wafer W.
- a substrate processing apparatus 10 includes a processing container 11.
- the processing container 11 includes a bottomed cylindrical main body portion 11a having an open upper surface, and a conical cylindrical cover portion 11b that is slidable with respect to the main body portion 11a and has an inclined peripheral wall. Can be slid up and down by a driving mechanism (not shown).
- one end of a plurality of discharge pipes 12 is connected to the periphery, and an insertion hole 14 surrounded by a flange 13 is formed at the center.
- a support shaft 15 is inserted through the insertion hole 14. The upper part of the support shaft 15 protrudes into the processing container 11, and the lower end part is fixed to a base plate 16 disposed below the processing container 11.
- the discharge pipe 12 communicates with a waste liquid tank (not shown).
- a rotating chuck (holding portion) 21 is supported on the support shaft 15 so as to be rotatable about the normal direction of the semiconductor wafer W as a substrate rotation axis.
- the rotary chuck 21 has a disk-shaped base 22 provided with a through hole 22a in the center.
- a cylindrical support portion 23 is provided on the lower surface of the base 22, that is, at a position corresponding to the through hole 22 a with the central axis as the vertical direction.
- the support portion 23 is fitted on the outer peripheral side of the support shaft 15, and the upper and lower portions of the support shaft 15 are rotatably supported by bearings 24.
- a driven pulley 25 is provided on the outer peripheral surface of the lower end portion of the support portion 23.
- a motor 26 is provided on the base plate 16, and a drive pulley 27 is fitted on a rotating shaft 26 a of the motor 26.
- a belt 28 is stretched between the driving pulley 27 and the driven pulley 25. Therefore, when the motor 26 is operated, the support portion 23, that is, the rotary chuck 21 is rotationally driven.
- struts 29 are provided on the upper surface of the base 22 of the rotary chuck 21 so as to face upward in the circumferential direction.
- a support pin 31a and an engagement pin 31b that is outward from the support pin 31a and taller than the support pin 31a are provided at the upper end of each support column 29 so as to protrude.
- a semiconductor wafer W as a substrate is supported so that the lower surface of the peripheral portion is supported by the support pins 31a and the outer peripheral surface is engaged with the engagement pins 31b so as to be detachable. Accordingly, the semiconductor wafer W is rotated integrally with the rotary chuck 21.
- the support shaft 15 is provided with a conical head 40 having a diameter larger than that of the support shaft 15 at the upper end.
- the support shaft 15 has a gas supply path 40 a for an inert gas such as nitrogen gas whose tip is opened on the upper surface of the head 40, and a cleaning liquid supply of the cleaning liquid L whose tip is also opened on the upper surface of the head 40.
- a path 40b is formed along the axial direction.
- the gas supply path 40a communicates with a gas supply source (not shown), and the cleaning liquid supply path 40b communicates with a supply source of the cleaning liquid L (not shown).
- the inert gas supplied to the gas supply path 40a is ejected toward the semiconductor wafer W held by the support column 29, and the cleaning liquid L supplied to the cleaning liquid supply path 40b passes through the nozzle hole 40c at the front end of the semiconductor wafer W. Erupted toward.
- a circular cleaning brush unit 41 for cleaning the upper surface of the semiconductor wafer W is disposed on the surface (upper surface) Wa side of the semiconductor wafer W held by the rotary chuck 21.
- the cleaning brush unit 41 includes a cleaning brush 41a and a brush holder 41b.
- the cleaning brush 41a is formed in a columnar shape, and its axial direction is perpendicular to the surface to be cleaned of the semiconductor wafer.
- the brush holder 41b is fitted and provided.
- the cleaning brush 41a is swung along the radial direction of the semiconductor wafer W by the swing mechanism 42 together with the brush holder 41b. That is, the swing mechanism 42 has a hollow cylindrical horizontal arm 43.
- a rotary motor 44 as a drive source is built in the front end portion of the horizontal arm 43 with the rotary shaft 44a being vertical, and a brush holder 41b is attached to the rotary shaft 44a.
- the cleaning brush 41a is formed of a porous PTFE material (polytetrafluoroethylene) fiber (hereinafter referred to as “PTFE fiber”), which is one of fluororesins.
- PTFE fiber porous PTFE material (polytetrafluoroethylene) fiber
- the cleaning brush 41a is formed so that the PTFE fiber direction is vertical. Specifically, as shown in FIG. 3, the direction in which the fibers of the cleaning brush 41 a extend is arranged perpendicular to the upper surface of the semiconductor wafer W as a whole. That is, the fibers (fibrils) are formed so as to extend in a direction perpendicular to the upper surface of the semiconductor wafer W as a whole.
- the node (island-like thing) which connects a fiber is formed in parallel with respect to the upper surface of the semiconductor wafer W so that it may mention later.
- the gaps between the fibers on the surface in contact with the upper surface of the semiconductor wafer W are not formed at regular intervals, but are formed at irregular intervals, for example, 10 nm to 500 nm. .
- FIG. 4 shows an enlarged side view of the main part of the cleaning brush 41a, that is, the porous PTFE material 100.
- the porous PTFE material 100 includes a plurality of nodes 101 distributed in an island shape, and a plurality of fibers 102 oriented from these nodes 101 in the extending direction (lateral).
- a gap 103 exists between the fibers 102.
- the gap 103 can be a continuous pore or an independent pore.
- a cleaning brush 41A in which the fiber direction of the porous PTFE material 100 is formed horizontally will be described.
- fibers are formed to extend in parallel to the upper surface of the semiconductor wafer W.
- the node (island-like) connecting the fibers is formed in a direction perpendicular to the upper surface of the semiconductor wafer W.
- the gaps between the nodes (the length of the fiber extending from each node) on the surface that contacts the upper surface of the semiconductor wafer W are not formed at regular intervals, but are formed at irregular intervals, for example, , 300 nm to 500 nm in size.
- FIG. 6 is an enlarged side view showing the main part of the cleaning brush 41A, that is, the porous PTFE material 100.
- the porous PTFE material 100 includes a plurality of nodes 101 distributed in an island shape, and a plurality of fibers 102 oriented from these nodes 101 in the extending direction (longitudinal).
- a gap 103 exists between the fibers 102.
- the gap 103 can be a continuous pore or an independent pore.
- Fig. 7 shows the removal performance for each particle size according to the PTFE fiber direction. That is, when the PTFE fiber direction is vertical (cleaning brush 41a), the removal performance is higher than when the PTFE fiber direction is horizontal (cleaning brush 41A) over a particle size range of 10 to 80 nm. Therefore, in the present embodiment, the cleaning brush 41a in which the fiber direction of the porous PTFE material 100 is vertical is used.
- Particles present on the upper surface of the semiconductor wafer W enter the cleaning brush 41a.
- the entering particles are caught between the fibers on the bottom surface (contact surface with the semiconductor wafer W) of the cleaning brush 41a.
- the caught particles are pulled by the cleaning brush 41a that moves relative to the semiconductor wafer W and peeled off from the upper surface of the semiconductor wafer W.
- particles having a size that does not enter between the bottom surface of the cleaning brush 41a and the surface of the semiconductor wafer W hit the end surface of the cleaning brush 41a.
- the hit particles are moved to the end of the semiconductor wafer W so as to be swept with a broom by the swing of the cleaning brush 41a.
- the reason why the removal performance is higher than that in the case where the PTFE fiber direction is vertical compared to the case where the PTFE fiber direction is horizontal will be considered. That is, when the fiber direction of the porous PTFE material 100 is set to be vertical, the spacing between the fibers of the cleaning brush 41a is irregularly formed. It is formed in various sizes (10 nm to 500 nm). In a portion where the distance between the fibers is narrow (less than 50 nm), small-sized particles Pa that fit the size of the distance between the fibers can enter. Therefore, it is considered that the removal rate for removing small particles Pa is high. Where the distance between the fibers is slightly wide (50 nm or more), large-sized particles Pb that fit the distance between the fibers can enter. Therefore, it is considered that the removal rate for removing both small particles Pa and relatively large particles Pb is high.
- the distance between the nodes on the surface in contact with the upper surface of the semiconductor wafer W is 300 to 500 nm. Since the particle Pa and the particle Pb are small relative to the size of the gap between the brush nodes, even if the particle Pa enters the gap between the nodes, there is a difference between the gap and the particle size, so the particles Pa and Pb are The particles Pa and Pb remain on the upper surface of the semiconductor wafer W without being held in the gap between the nodes and being caught by the cleaning brush 41A. That is, since the particles Pa and Pb cannot enter, it is considered that the particle removal performance is low.
- the nozzle pipe (supply part) 45 connected to the supply source of the cleaning liquid L (not shown) is inserted into the horizontal arm 43.
- the tip of the nozzle tube 45 is led downward from the tip of the horizontal arm 43, and the opening of the tip is directed to the outer peripheral surface of the cleaning brush 41a. Accordingly, the cleaning liquid L is supplied from the radially outer side of the cleaning brush 41a by the nozzle tube 45.
- the cleaning liquid L is, for example, ammonia, sulfuric acid, hydrogen peroxide solution, ozone water, a mixed solution (APM) of ammonia and hydrogen peroxide solution, a chemical solution containing any of surfactants, or water / ultra pure water. .
- the cleaning liquid L may be heated.
- APM mixed solution
- the porous PTFE material which is the main component of the cleaning brush 41a described above, is excellent in heat resistance and chemical resistance, and is hardly deteriorated by the cleaning liquid L. For this reason, various chemical
- the supply direction A of the cleaning liquid L supplied from the nozzle tube 45 toward the cleaning brush unit 41 is substantially tangential to the cleaning brush unit 41 as shown in FIG.
- the direction is set along the rotation direction B of the unit 41.
- the rotation direction of the cleaning brush unit 41 may be either the same direction as the rotation direction of the semiconductor wafer W or the opposite direction.
- the upper end of the swing shaft 46 whose axis is perpendicular to the end of the horizontal arm 43 is connected.
- the lower end portion of the swing shaft 46 protrudes below the base plate 16 and is supported by the support body 47 so as to be swingable.
- a pair of guides 48 are provided on one side surface of the support 47 along the vertical direction, and the guides 48 are rails provided on one side surface of the mounting plate 49 provided on the lower surface of the base plate 16 along the vertical direction. 50 is slidably engaged.
- a vertical drive motor 51 is provided at a portion below the support 47 of the mounting plate 49.
- the vertical drive motor 51 has a drive shaft 52 such as a screw shaft, for example, and the drive shaft 52 is fitted to the support 47.
- the support body 47 is vertically driven along the rail 50. That is, the cleaning brush unit 41 is driven up and down via the support 47, the swing shaft 46 and the horizontal arm 43.
- a swing drive source 53 is attached to the other side of the support 47.
- the swing drive source 53 includes a storage box 54 and a motor 55 provided on the lower surface of the storage box 54.
- a drive gear (not shown) that is rotationally driven by a motor 55 is accommodated in the storage box 54.
- a driven gear (not shown) is provided at the lower end portion supported by the support 47 of the swing shaft 46, and a belt is stretched between the driven gear and the drive gear. Therefore, the swing shaft 46 swings within a predetermined angle range when the motor 55 of the swing drive source 53 operates.
- the cleaning brush unit 41 provided at the distal end of the horizontal arm 43 has a solid line and a broken line in FIG.
- the semiconductor wafer W held on the rotary chuck 21 is swung between the central portion and the peripheral portion in the radial direction.
- This swing range is indicated by an arrow D in FIG.
- the rotary motor 44 that rotationally drives the cleaning brush unit 41 is connected to the control device 90.
- the control device 90 supplies power to the rotary motor 44 and drives the cleaning brush unit 41 up and down by the up and down drive motor 51.
- the control device 90 appropriately controls parameters of each mechanism, for example, the pressing amount, the rotation speed, the swing speed, and the discharge amount of the cleaning liquid L.
- the semiconductor wafer W subjected to the CMP process is cleaned by the substrate processing apparatus 10 configured as described above. Due to the CMP process, residues such as slurry containing organic matter and shavings of the semiconductor wafer W remain on the upper surface of the semiconductor wafer W and adhere to the upper surface of the semiconductor wafer W.
- the semiconductor wafer W is held on the rotary chuck 21 with the cleaning brush unit 41 retracted to the outside of the processing container 11, and the motor 26 is operated to rotate the semiconductor wafer W together with the rotary chuck 21.
- the cleaning brush unit 41 is moved from the retracted position to above the semiconductor wafer W. While rotating the cleaning brush unit 41 by operating the rotation motor 44, the cleaning liquid L such as pure water is supplied to the lower surface and the upper surface of the semiconductor wafer W from the cleaning liquid supply path 40b of the support shaft 15 and the nozzle tube 45 while moving up and down.
- the driving motor 51 is operated to lower the cleaning brush unit 41.
- the swing drive source 53 is operated to swing the horizontal arm 43, that is, the cleaning brush unit 41 on the upper surface of the semiconductor wafer W as shown by an arrow D in FIG.
- the swing speed can be appropriately adjusted according to the viscosity of the residue remaining on the upper surface of the semiconductor wafer W. For example, when the adhesion force of the slurry containing the organic substance is strong, control such as slowing the swing speed or the rotation speed of the semiconductor wafer W is performed.
- the cleaning brush unit 41 is lowered by the vertical drive motor 51, and the cleaning brush 41a contacts the surface to be cleaned of the semiconductor wafer W. Particles adhering to the upper surface of the semiconductor wafer W are removed by the cleaning brush 41a.
- the cleaning brush 41a Since the main component of the cleaning brush 41a is a porous PTFE material, the cleaning brush 41a is excellent in heat resistance and chemical resistance against the chemical liquid and the heated cleaning liquid L.
- the cleaning brush 41a is brought into contact with the surface to be cleaned of the semiconductor wafer W in the vertical (vertical direction) and the cleaning brush 41a is contacted along the radial direction of the semiconductor wafer W.
- the cleaning brush 41a By swinging, small particles Pa to relatively large particles Pb can be removed. Therefore, it is possible to have high cleanliness on the surface to be cleaned of the semiconductor wafer W.
- FIG. 8 is a perspective view showing a cleaning brush unit 60 according to a modification of the cleaning brush unit 41 described above.
- the cleaning brush unit 60 includes a disk-shaped bracket (brush holder) 61 disposed opposite to the surface to be cleaned of the semiconductor wafer W, and seven cleaning brushes 62 provided on the surface of the bracket 61 with a predetermined gap. Yes.
- the cleaning brush 62 is formed with a smaller diameter than the above-described cleaning brush 41a. Further, like the cleaning brush 41a, it is formed in a columnar shape, and is provided on the bracket 61 so that its axial direction is perpendicular to the surface to be cleaned of the semiconductor wafer.
- the outer diameter of the bracket 61 is substantially the same as the outer diameter of the brush holder 41b.
- the number of cleaning brushes 62 provided on the bracket 61 is not limited to seven as long as the surface to be cleaned of the semiconductor wafer W can be sufficiently cleaned.
- the cleaning brush unit 60 is provided with a gap between the cleaning brushes 62, the cleaning liquid L passes through the gap and moves backward in the swinging direction of the cleaning brush 62 together with the particles swept out by the cleaning brush 62.
- FIG. 9 is a perspective view showing a cleaning brush unit 60A according to another modification of the cleaning brush unit 41.
- the cleaning brush unit 60 ⁇ / b> A is provided with a nozzle hole 63 connected to the cleaning liquid supply path 45 ⁇ / b> A in the center of the bracket 61.
- the nozzle tube 45 in FIG. 1A may be omitted.
- FIG. 10 is a longitudinal sectional view showing a substrate processing apparatus 200 according to a second embodiment of the present invention
- FIG. 11 is a transverse sectional view showing the substrate processing apparatus 200
- FIG. 12 is a roll incorporated in the substrate processing apparatus 200.
- 3 is a perspective view showing a brush 221.
- the substrate processing apparatus 200 includes a cleaning tank 201. As shown in FIG. 11, an introduction port 203 is formed on one side wall of the cleaning tank 201. The semiconductor wafer W is introduced from the outside into the inside through the introduction port 203. On the side wall adjacent to one side wall of the cleaning bath 201, a lead-out port 204 for carrying out the cleaned semiconductor wafer W is formed.
- the driving roller 206 and the regulating roller 207 are arranged so as to be rotatable with their axis lines vertical, and are arranged at predetermined intervals along the circumferential direction of the semiconductor wafer W.
- the driving roller 206 is arranged on the right side in FIG. 11, and the regulating roller 207 is arranged on the left side in FIG.
- a lower end portion of the driving roller 206 is rotatably supported by the first bearing body 211.
- the first bearing body 211 is fixed to the support plate 209.
- the lower end portion of the regulating roller 207 is rotatably supported by the second bearing body 212.
- the second bearing body 212 is slidably provided on the support plate 209 and is driven by the drive cylinder 213 in the direction of contact with and away from the drive roller 206 as indicated by an arrow in FIG.
- the driving roller 206 is engaged with the peripheral portion of the semiconductor wafer W.
- the regulating roller 207 regulates the movement of the semiconductor wafer W engaged and held in contact with the peripheral portion of the semiconductor wafer W in the radial direction.
- the driving roller 206 is rotationally driven by the first driving mechanism 217.
- the first drive mechanism 217 includes a motor 218 disposed below the support plate 209 as shown in FIG.
- a driving pulley 219a is provided on the rotating shaft 218a of the motor 218.
- a belt 220 is stretched between the driving pulley 219a and the three driven pulleys 219b provided at the lower ends of the driving rollers 206, respectively. Therefore, when the motor 218 is operated, each drive roller 206 can be rotationally driven via the belt 220.
- a pair of upper and lower roll brushes 221 are arranged supported by a pair of holding portions 222 having a horizontal rotation axis. These roll brushes 221 are respectively driven to rotate by the second drive mechanism 220A shown in FIG. 11 and also driven in the vertical direction by the vertical drive mechanism 220B via the holding portion 222.
- a pair of pipe-like lower nozzle 241 and upper nozzle 242 are arranged with the semiconductor wafer W interposed therebetween.
- a cleaning liquid L is supplied from the nozzles 241 and 242 when the upper and lower surfaces (surfaces to be cleaned) of the semiconductor wafer W are cleaned by the pair of roll brushes 221.
- the holding part 222 is rotatably supported with respect to the bearing body 223 configured to be movable along the vertical direction.
- a rotation shaft of a motor 224 is connected to the inside of the bearing body 223, and the rotation of the motor 224 is transmitted to the holding unit 222 via the bearing body 223 so that the roll brush 221 can be rotated.
- the bearing body 223 is supported by the arm 226 and is supported by the vertical drive mechanism 220B.
- the roll brush 221 can be brought into contact with the lower surface and the upper surface of the semiconductor wafer W with a predetermined contact force by driving the arm 226 up and down by the vertical drive mechanism 220B.
- Each roll brush 221 includes a cleaning brush 221b attached to the surface of the cylindrical portion 221a at a predetermined interval as shown in FIG.
- the axial direction of the cylindrical portion 221a is formed parallel to the surface to be cleaned of the semiconductor wafer W. That is, each roll brush 221 is provided in parallel to the processing surface of the semiconductor wafer W.
- the cleaning brush 221b is formed in the same manner as the above-described cleaning brush 41a. That is, the cylindrical portion 221a is formed in a columnar shape so that the axial center direction of the cleaning brush 221b is perpendicular to the surface to be processed of the semiconductor wafer when it is disposed opposite to the surface to be cleaned of the semiconductor wafer W. Is provided on the surface. In addition, about the dimension, it forms in the small diameter rather than the washing
- the roll brush 221 is rotationally driven in a direction in which the semiconductor wafer W supplied between the pair of roll brushes 221 by the motor 224 is pressed against the outer peripheral surface of the drive roller 206 by its rotational force.
- the pair of roll brushes 221 are positioned at a predetermined height, and the drive cylinder 213 is operated so that the pair of regulating rollers 207 are located on the opposite side of the semiconductor wafer W in the radial direction.
- the drive roller 206 is driven in the forward direction until it comes into contact with the outer peripheral surface of the drive roller 206 or comes close to the drive roller 206 through a slight interval. In this way, the semiconductor wafer W is held, and the roll brush 221 and the three drive rollers 206 are rotationally driven. Further, the cleaning liquid L is sprayed from the nozzles 241 and 242 toward the upper and lower surfaces of the semiconductor wafer W.
- the cleaning brushes 221b of the respective roll brushes 221 can be pressed against the upper and lower surfaces of the semiconductor wafer W. Cleaning can be performed almost uniformly over the entire length in the direction.
- the roll brush 221 according to the present embodiment can remove particles Pa and Pb in a wide range of sizes and can be scrubbed simultaneously with the supply of the cleaning liquid L by being used in the same manner as the cleaning brush 41a described above. It is.
- the semiconductor wafer W is exemplified as a substrate to be processed by the substrate processing apparatus.
- the present invention is not limited to this, and can be applied to a liquid crystal substrate, a glass substrate such as a photomask.
- the cleaning brush unit 41 is rotated during the cleaning process, it does not have to be rotated.
- the shape of the cleaning brush 41a is not limited to a cylindrical shape.
- the porous PTFE material was mentioned as a fluororesin, if it has the same structure which can take in a small particle as mentioned above, other fluororesins (for example, PVDF and TFE) will be used. Also good.
- this invention is not limited to the said embodiment, In the implementation stage, it can change variously in the range which does not deviate from the summary. Further, the embodiments may be implemented in combination as appropriate, and in that case, the combined effect can be obtained. Furthermore, the present invention includes various inventions, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the problem can be solved and an effect can be obtained, the configuration from which the constituent requirements are deleted can be extracted as an invention.
- a chemical solution can be used as the cleaning solution, or the cleaning solution can be heated and a wide range of particle removal can be performed.
Abstract
Description
Claims (10)
- 基板の被洗浄面を洗浄する基板処理装置において、
上記基板を保持可能な保持部と、
上記保持部に保持される上記基板の被洗浄面に対向配置され、多孔質のフッ素樹脂の繊維を上記基板の面に対し垂直方向に向けて形成された洗浄ブラシと、
上記保持部に保持された上記基板の上記被洗浄面の法線方向を基板回転軸にして回転駆動する駆動源と、
上記保持部に保持される上記基板の被洗浄面に洗浄液を供給する供給部と、を備えている基板処理装置。 - 前記フッ素樹脂は、ポリテトラフルオロエチレンである請求項1に記載の基板処理装置。
- 上記洗浄ブラシは、円柱状に形成されており、その軸心方向は上記基板の被洗浄面に対して垂直に設けられている請求項1に記載の基板処理装置。
- 上記洗浄ブラシは、上記繊維を繋ぐノードが上記基板の上面に対して平行に配置されている請求項1に記載の基板処理装置。
- 上記洗浄ブラシは、上記基板の被洗浄面に対して対向配置されるブラシホルダに複数設けられている請求項3に記載の基板処理装置。
- 上記洗浄ブラシは、上記基板の被洗浄面に対して平行の回転軸を有する円筒体の表面に複数設けられている請求項3に記載の基板処理装置。
- 基板の被洗浄面を洗浄する基板処理方法において、
保持部に保持される上記基板の被洗浄面に洗浄液を供給し、
保持部に保持される上記基板の被洗浄面に対向配置され、多孔質のフッ素樹脂の繊維を上記基板の被処理面に対して垂直方向に向けて形成された洗浄ブラシを接触させ、
上記保持部を上記基板の上記被洗浄面の法線方向を基板回転軸にして回転駆動する基板処理方法。 - 前記フッ素樹脂は、ポリテトラフルオロエチレンである請求項7に記載の基板処理方法。
- 上記洗浄ブラシは、円柱状に形成されており、その軸心方向は上記基板の被洗浄面に対して垂直に設けられている請求項7に記載の基板処理方法。
- 上記洗浄ブラシは、上記繊維を繋ぐノードが上記基板の上面に対して平行に配置されている請求項7に記載の基板処理方法。
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JP7439788B2 (ja) | 2021-04-21 | 2024-02-28 | 信越半導体株式会社 | ウェーハの洗浄方法 |
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