WO2021205994A1 - 基板処理方法、及び基板処理装置 - Google Patents
基板処理方法、及び基板処理装置 Download PDFInfo
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- WO2021205994A1 WO2021205994A1 PCT/JP2021/014232 JP2021014232W WO2021205994A1 WO 2021205994 A1 WO2021205994 A1 WO 2021205994A1 JP 2021014232 W JP2021014232 W JP 2021014232W WO 2021205994 A1 WO2021205994 A1 WO 2021205994A1
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- substrate
- pure water
- nozzle
- chemical solution
- cleaning film
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- H10P70/56—
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- H10P52/00—
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- H10P70/20—
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- H10P72/0408—
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- H10P72/0414—
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- H10P72/7624—
Definitions
- This disclosure relates to a substrate processing method and a substrate processing apparatus.
- a chemical solution and a rinse solution are supplied to the lower surface of the substrate in this order while the substrate is held horizontally and rotated.
- a fluid supply pipe including a plurality of nozzles is arranged directly below the center of the lower surface of the substrate.
- the fluid supply pipe is inserted inside the rotating shaft of the holding portion that holds the substrate horizontally, and is installed so as not to rotate even if the rotating shaft rotates.
- the fluid supply pipe supplies a chemical solution, a rinse solution, nitrogen gas, or the like to the lower surface of the substrate.
- One aspect of the present disclosure provides a technique for cleaning a nozzle unit arranged to face the center of the lower surface of a substrate.
- the substrate processing method has the following (A) to (C).
- the nozzle unit arranged to face the center of the lower surface of the substrate can be cleaned.
- FIG. 1 is a cross-sectional view showing a substrate processing apparatus according to an embodiment.
- FIG. 2 is a diagram showing a substrate processing method according to an embodiment.
- FIG. 3 is a diagram showing an example of S101 of FIG.
- FIG. 4 is a diagram showing an example of S102 of FIG.
- FIG. 5 is a diagram showing an example of S103 of FIG.
- FIG. 6 is a diagram showing an example of S104 of FIG.
- FIG. 7 is a diagram showing an example of S105 of FIG.
- FIG. 8 is a diagram showing an example of S106 of FIG.
- FIG. 9 is a diagram showing an example of S107 of FIG.
- FIG. 10 is a diagram showing an example of S108 of FIG.
- FIG. 11 is a diagram showing a substrate processing method according to a modified example.
- FIG. 11 is a diagram showing a substrate processing method according to a modified example.
- FIG. 12 is a diagram showing an example of S106 of FIG.
- FIG. 13 is a diagram showing an example of S107 of FIG.
- FIG. 14 is a plan view showing a first example of the baffle plate.
- FIG. 15 is a cross-sectional view taken along the line XV-XV of FIG. 14, showing a state in which an organic solvent is supplied to the upper surface of the substrate.
- FIG. 16 is an enlarged cross-sectional view showing the baffle plate of FIG.
- FIG. 17 is a cross-sectional view showing a second example of the baffle plate.
- FIG. 18 is a cross-sectional view showing a third example of the baffle plate.
- the same or corresponding configurations may be designated by the same reference numerals and description thereof may be omitted.
- the X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.
- the X-axis direction and the Y-axis direction are the horizontal direction, and the Z-axis direction is the vertical direction.
- the substrate processing device 10 processes the substrate W.
- the substrate W includes, for example, a silicon wafer, a compound semiconductor wafer, or the like.
- the substrate W may be a glass substrate.
- the substrate processing device 10 includes, for example, a holding unit 20, a rotating unit 30, a first liquid supply unit 40, a second liquid supply unit 50, a nozzle unit 60, a ring 62, a gutter 63, and a fluid supply unit.
- a 70, a cup 80, and a control unit 90 are provided.
- the holding unit 20 holds the substrate W horizontally.
- the substrate W includes an upper surface Wa and a lower surface Wb.
- the holding portion 20 has a base plate 21 that forms a space between the holding portion 20 and the lower surface Wb of the substrate W, and an opening / closing claw 22 that grips the peripheral edge of the substrate W.
- the base plate 21 has a disk shape and is arranged horizontally.
- a hole is formed in the center of the base plate 21, and the fluid supply shaft 71 of the fluid supply unit 70 is arranged in the hole.
- a plurality of opening / closing claws 22 are arranged at intervals along the peripheral edge of the base plate 21.
- the rotating unit 30 rotates the holding unit 20.
- the rotating portion 30 is, for example, a rotating shaft 31 extending downward from the center of the base plate 21 of the holding portion 20, a rotating motor 32 for rotating the rotating shaft 31, and a belt for transmitting the rotational driving force of the rotating motor 32 to the rotating shaft 31. 33 and.
- the rotating shaft 31 has a cylindrical shape, and a fluid supply shaft 71 is arranged inside the rotating shaft 31. The fluid supply shaft 71 is fixed and does not rotate with the rotating shaft 31.
- the first liquid supply unit 40 supplies the liquid to the upper surface Wa of the substrate W held by the holding unit 20.
- the first liquid supply unit 40 has, for example, a nozzle 41 for discharging the liquid, a moving mechanism 42 for moving the nozzle 41 in the radial direction of the substrate W, and a supply line 43 for supplying the liquid to the nozzle 41. ..
- the nozzle 41 is provided above the holding portion 20 and discharges the liquid downward.
- the moving mechanism 42 has, for example, a swivel arm 42a for holding the nozzle 41 and a swivel mechanism 42b for swiveling the swivel arm 42a.
- the swivel mechanism 42b may also serve as a mechanism for raising and lowering the swivel arm 42a.
- the swivel arm 42a is arranged horizontally, holds the nozzle 41 at one end in the longitudinal direction, and is swiveled around a swivel shaft extending downward from the other end in the longitudinal direction.
- the moving mechanism 42 may have a guide rail and a linear motion mechanism instead of the swivel arm 42a and the swivel mechanism 42b.
- the guide rails are arranged horizontally, and a linear motion mechanism moves the nozzle 41 along the guide rails.
- the supply line 43 includes, for example, a common line 43a and a plurality of individual lines 43b connected to the common line 43a.
- the individual line 43b is provided for each type of liquid.
- Examples of the type of liquid include a first chemical solution L1, a second chemical solution L2, and pure water L3.
- One of the first chemical solution L1 and the second chemical solution L2 is acidic, and the other is alkaline.
- the acidic chemical solution is, for example, DHF (dilute hydrofluoric acid) or the like.
- the alkaline chemical solution is, for example, SC1 (an aqueous solution containing hydrogen peroxide and ammonium hydroxide) or the like.
- Pure water L3 is, for example, DIW (deionized water).
- An on-off valve 45 for opening and closing the flow path of the liquid and a flow rate controller 46 for controlling the flow rate of the liquid are provided in the middle of the individual line 43b.
- the first chemical solution L1, the second chemical solution L2, and the pure water L3 are discharged from one nozzle 41 in FIG. 1, but may be discharged from different nozzles 41.
- a supply line 43 is provided for each nozzle 41.
- the second liquid supply unit 50 supplies the liquid to the upper surface Wa of the substrate W held by the holding unit 20, similarly to the first liquid supply unit 40.
- the second liquid supply unit 50 includes, for example, a nozzle 51 for discharging the liquid, a moving mechanism 52 for moving the nozzle 51 in the radial direction of the substrate W, and a supply line 53 for supplying the liquid to the nozzle 51. ..
- the nozzle 51 is provided above the holding portion 20 and discharges the liquid downward. The nozzle 51 of the second liquid supply unit 50 and the nozzle 41 of the first liquid supply unit 40 are moved independently.
- the moving mechanism 52 has, for example, a swivel arm 52a for holding the nozzle 51 and a swivel mechanism 52b for swiveling the swivel arm 52a.
- the swivel mechanism 52b may also serve as a mechanism for raising and lowering the swivel arm 52a.
- the swivel arm 52a is arranged horizontally, holds the nozzle 51 at one end in the longitudinal direction, and is swiveled around a swivel shaft extending downward from the other end in the longitudinal direction.
- the moving mechanism 52 may have a guide rail and a linear motion mechanism instead of the swivel arm 52a and the swivel mechanism 52b.
- the guide rails are arranged horizontally, and a linear motion mechanism moves the nozzle 51 along the guide rails.
- the supply line 53 supplies the organic solvent L4 such as IPA to the nozzle 51.
- An on-off valve 55 for opening and closing the flow path of the organic solvent L4 and a flow rate controller 56 for controlling the flow rate of the organic solvent L4 are provided in the middle of the supply line 53.
- the organic solvent L4 a solvent having a lower surface tension than that of pure water L3 is used.
- the substrate W can be dried after replacing the liquid film on the upper surface Wa of the substrate W with the liquid film of the organic solvent L4 from the liquid film of pure water L3. When the substrate W is dried, it is possible to suppress the collapse of the uneven pattern due to surface tension.
- the uneven pattern is formed in advance on the upper surface Wa of the substrate W.
- the uneven pattern may not be formed in advance on the lower surface Wb of the substrate W. Therefore, the organic solvent L4 may be supplied to the upper surface Wa of the substrate W and may not be supplied to the lower surface Wb of the substrate W.
- the liquid film on the upper surface Wa of the substrate W is replaced with the liquid film of the organic solvent L4 from the liquid film of the pure water L3, the liquid film of the pure water L3 is not interrupted.
- the supply position and the supply position of the organic solvent L4 are moved independently. Specifically, the supply position of the pure water L3 is moved outward in the radial direction of the substrate W while the supply position of the organic solvent L4 is fixed at the center of the upper surface Wa of the substrate W. Therefore, the second liquid supply unit 50 and the first liquid supply unit 40 are provided separately.
- the supply position of the pure water L3 may be set to the center of the upper surface Wa of the substrate W while the supply position of the organic solvent L4 is fixed to the center of the upper surface Wa of the substrate W. It may not be necessary to move it radially outward.
- the second liquid supply unit 50 may be omitted, and the nozzle 41 of the first liquid supply unit 40 may discharge the organic solvent L4.
- the nozzle unit 60 includes a plurality of nozzles 61A, 61B, and 61C arranged to face each other in the center of the lower surface of the substrate W held by the holding portion 20.
- the center of the lower surface is, for example, a region within 50 mm from the center of the lower surface.
- the plurality of nozzles 61A, 61B, and 61C are formed on the upper surface of the nozzle unit 60, and each discharges a fluid upward.
- the nozzle 61A discharges, for example, the first chemical solution L1, the second chemical solution L2, and the pure water L3 upward.
- the nozzle 61B discharges pure water L3 upward, for example.
- the nozzle 61C discharges a gas such as N 2 gas upward.
- a ring 62 surrounding a plurality of nozzles 61A, 61B, 61C is provided on the upper surface of the nozzle unit 60.
- the ring 62 projects upward from the peripheral edge of the upper surface of the nozzle unit 60 and stores pure water L3 inside.
- the ring 62 includes, for example, an inclined portion 62a that inclines outward in the radial direction of the substrate W so as to go vertically upward from the peripheral edge of the upper surface of the nozzle unit 60, and a vertical portion 62b that extends directly below from the upper end of the inclined portion 62a. ..
- the nozzle unit 60 is arranged inside the ring-shaped gutter 63.
- the gutter 63 stores the pure water L3 that overflows from the ring 62.
- the gutter 63 includes an inner wall 63a surrounding the nozzle unit 60, an outer wall 63b arranged outside the inner wall 63a, a groove 63c formed between the inner wall 63a and the outer wall 63b, and a bottom wall 63d forming the bottom of the groove 63c. And, including.
- the lower end of the vertical portion 62b of the ring 62 is inserted into the groove 63c of the gutter 63.
- the pure water L3 flowing down along the vertical portion 62b is temporarily stored in the groove 63c of the gutter 63 and overflows to the outside from the outer wall 63b of the gutter 63.
- gas such as N 2 gas is supplied between the inner wall 63a and the nozzle unit 60 of the trough 63.
- the fluid supply unit 70 supplies the first chemical solution L1, the second chemical solution L2, pure water L3, and gas to the nozzle unit 60.
- the fluid supply unit 70 has a fluid supply shaft 71 in which the nozzle unit 60 is provided at the upper end.
- the fluid supply shaft 71 is arranged inside the rotating shaft 31 and is not rotated together with the rotating shaft 31.
- the fluid supply shaft 71 is provided with a plurality of supply lines 72A, 72B, 72C connected to the plurality of nozzles 61A, 61B, 61C.
- the supply line 72A is connected to the nozzle 61A, and supplies the first chemical solution L1, the second chemical solution L2, and pure water L3 to the nozzle 61A.
- the supply line 72A includes, for example, a common line 72Aa and a plurality of individual lines 72Ab connected to the common line 72Aa.
- the individual line 72Ab is provided for each type of liquid.
- an on-off valve 75A for opening and closing the flow path of the first chemical solution L1 and the like, and a flow rate controller 76A for controlling the flow rate of the first chemical solution L1 and the like are provided.
- the supply line 72B is connected to the nozzle 61B and supplies pure water L3 to the nozzle 61B.
- an on-off valve 75B that opens and closes the flow path of the pure water L3, a flow rate controller 76B that controls the flow rate of the pure water L3, and a temperature controller 77B that controls the temperature of the pure water L3.
- the temperature controller 77B includes, for example, a heater that heats pure water L3.
- the supply line 72C is connected to the nozzle 61C and supplies a gas such as N 2 gas to the nozzle 61C.
- An on-off valve 75C for opening and closing the gas flow path and a flow rate controller 76C for controlling the flow rate of the liquid are provided in the middle of the supply line 72C.
- the cup 80 collects various liquids supplied to the substrate W.
- the cup 80 includes a cylindrical portion 81, a bottom lid portion 82, and an inclined portion 83.
- the cylindrical portion 81 has an inner diameter larger than the diameter of the substrate W and is arranged vertically.
- the bottom lid portion 82 closes the opening at the lower end of the cylindrical portion 81.
- the inclined portion 83 is formed over the entire circumference of the upper end of the cylindrical portion 81, and inclines upward toward the inside in the radial direction of the cylindrical portion 81.
- the bottom lid portion 82 is provided with a drainage pipe 84 for discharging the liquid accumulated inside the cup 80 and an exhaust pipe 85 for discharging the gas accumulated inside the cup 80.
- the control unit 90 controls the rotating unit 30, the first liquid supply unit 40, the second liquid supply unit 50, and the fluid supply unit 70.
- the control unit 90 is, for example, a computer, and includes a CPU (Central Processing Unit) 91 and a storage medium 92 such as a memory.
- the storage medium 92 stores programs that control various processes executed by the substrate processing apparatus 10.
- the control unit 90 controls the operation of the substrate processing device 10 by causing the CPU 91 to execute the program stored in the storage medium 92.
- each step S101 to S108 shown in FIG. 2 and the like is carried out under the control of the control unit 90.
- the substrate W is held horizontally and rotated about a vertical rotation shaft 31.
- the nozzle 61C of the nozzle unit 60 continues to discharge gas.
- the first chemical solution L1 is supplied to both the upper surface Wa and the lower surface Wb of the substrate W.
- the first chemical solution L1 is supplied from the nozzle 41 of the first liquid supply unit 40 to the center of the upper surface of the substrate W, and is wetted and spread over the entire upper surface by centrifugal force to process the entire upper surface.
- the first chemical solution L1 is supplied from the nozzle 61A of the nozzle unit 60 to the center of the lower surface of the substrate W, and is wetted and spread over the entire lower surface by centrifugal force to process the entire lower surface.
- step S101 the first chemical solution L1 scatters due to collision with the lower surface Wb of the substrate W to form droplets.
- the droplet adheres on the nozzle unit 60.
- step S102 pure water L3 is supplied to both the upper surface Wa and the lower surface Wb of the substrate W, and the liquid film of the first chemical solution L1 formed in S101 is made of pure water L3. Replace with a liquid film.
- the pure water L3 is supplied from the nozzle 41 of the first liquid supply unit 40 to the center of the upper surface of the substrate W, wets and spreads over the entire upper surface by centrifugal force, flushes the first chemical solution L1 remaining on the upper surface Wa, and the pure water L3 is applied to the upper surface Wa. Form a liquid film of.
- the pure water L3 is supplied from the nozzle 61A of the nozzle unit 60 to the center of the lower surface of the substrate W, wets and spreads over the entire lower surface by centrifugal force, and the first chemical solution L1 remaining on the lower surface Wb is washed away, and the pure water L3 is applied to the lower surface Wb. Form a liquid film.
- step S103 the second chemical solution L2 is supplied to both the upper surface Wa and the lower surface Wb of the substrate W, and the liquid film of pure water L3 formed in S102 is used as the second chemical solution.
- the second chemical solution L2 is supplied from the nozzle 41 of the first liquid supply unit 40 to the center of the upper surface of the substrate W, and is wetted and spread over the entire upper surface by centrifugal force to process the entire upper surface.
- the second chemical solution L2 is supplied from the nozzle 61A of the nozzle unit 60 to the center of the lower surface of the substrate W, and is wetted and spread over the entire lower surface by centrifugal force to process the entire lower surface.
- step S103 the second chemical solution L2 scatters due to collision with the lower surface Wb of the substrate W to form droplets.
- the droplet adheres on the nozzle unit 60.
- a neutralization reaction between the first chemical solution L1 and the second chemical solution L2 occurs on the nozzle unit 60, and crystals are precipitated.
- the precipitated crystals form particles P.
- step S104 pure water L3 is supplied to both the upper surface Wa and the lower surface Wb of the substrate W, and the liquid film of the second chemical solution L2 formed in S103 is made of pure water L3. Replace with a liquid film.
- the pure water L3 is supplied from the nozzle 41 of the first liquid supply unit 40 to the center of the upper surface of the substrate W, wets and spreads over the entire upper surface by centrifugal force, flushes the second chemical solution L2 remaining on the upper surface Wa, and the pure water L3 is flushed to the upper surface Wa.
- the pure water L3 is supplied from the nozzle 61A of the nozzle unit 60 to the center of the lower surface of the substrate W, wets and spreads over the entire lower surface by centrifugal force, and the second chemical solution L2 remaining on the lower surface Wb is washed away, and the pure water L3 is applied to the lower surface Wb. Form a liquid film.
- one nozzle 61B of the nozzle unit 60 discharges pure water L3, and a cleaning film F of pure water L3 is formed on the nozzle unit 60.
- the cleaning film F covers all the nozzles 61A, 61B, and 61C of the nozzle unit 60.
- the cleaning film F also covers the particles P and dissolves and removes the particles P. Therefore, the nozzle unit 60 can be cleaned.
- the nozzle unit 60 is arranged so as to face the center of the lower surface of the substrate W and is arranged in the vicinity of the lower surface Wb of the substrate W. Therefore, when particles P are generated on the upper surface of the nozzle unit 60, the generated particles P can be scattered and contaminate the center of the lower surface of the substrate W. According to this embodiment, the particles P generated on the upper surface of the nozzle unit 60 can be removed, so that the cleanliness of the substrate W can be improved.
- a ring 62 surrounding a plurality of nozzles 61A, 61B, 61C is provided on the upper surface of the nozzle unit 60.
- the ring 62 stores pure water L3 inside. Pure water L3 can be collected inside the ring 62, and the cleaning film F can reliably cover all the nozzles 61A, 61B, and 61C of the nozzle unit 60.
- the ring 62 is particularly effective when the heights of the plurality of nozzles 61A, 61B, and 61C are different and a step is formed.
- the ring 62 projects above all nozzles 61A, 61B, 61C. If the cohesive force of pure water L3 is used, the cleaning film F can be formed without the ring 62.
- the nozzle 61B may continue to discharge the pure water L3, and the pure water L3 may overflow from the inside of the ring 62 to the outside.
- the components eluted from the particles P into the pure water L3 also flow out from the inside of the ring 62 together with the pure water L3. Therefore, the pure water concentration of the cleaning film F accumulated inside the ring 62 can be maintained high, and the dissolution rate of the particles P can be maintained high.
- the cleaning membrane F may be formed of pure water L3 whose temperature has been adjusted in advance.
- the pure water L3 is discharged from the nozzle 61B after the temperature is adjusted by the temperature controller 77B.
- the temperature of pure water L3 is set higher than the freezing point and lower than the boiling point.
- the temperature of the pure water L3 is adjusted so that the particles P can be dissolved efficiently, and preferably the temperature is adjusted to be higher than room temperature. If the pure water L3 is heated by the temperature controller 77B, the particles P can be efficiently dissolved.
- a space S that separates the cleaning film F and the lower surface Wb of the substrate W is formed.
- the space S is formed between the cleaning film F and the liquid film of pure water L3 formed on the lower surface Wb of the substrate W.
- the space S can limit the movement of the particles P from the upper surface of the nozzle unit 60 to the lower surface Wb of the substrate W.
- one nozzle 61A discharges pure water L3 so as to reach the lower surface Wb of the substrate W, it discharges pure water L3 at a flow rate of, for example, 800 ml / min to 1600 ml / min, preferably 1000 ml / min to 1400 ml / min. ..
- another nozzle 61B discharges pure water L3 so as not to reach the lower surface Wb of the substrate W, it discharges pure water L3 at a flow rate of, for example, 250 ml / min to 500 ml / min, preferably 300 ml / min to 450 ml / min. do.
- the nozzle 61B discharges pure water L3 at a flow rate lower than that of the nozzle 61A. After being discharged from the nozzle 61B, the pure water L3 flows laterally with almost no upward flow and covers all the nozzles 61A, 61B and 61C. It is possible to suppress the splashing of pure water L3.
- nozzle 61A supplies pure water L3 to the lower surface Wb of the substrate W
- another nozzle 61B forms a cleaning film F on the nozzle unit 60. That is, the nozzle unit 60 is washed while the pure water L3 removes the second chemical solution L2 remaining on the lower surface Wb of the substrate W. Cleaning of the nozzle unit 60 can be performed during the processing of the substrate W, and a decrease in throughput can be suppressed.
- step S105 as shown in FIG. 7, the liquid film of pure water L3 is replaced with the liquid film of the organic solvent L4.
- the supply position of pure water L3 is moved from the central position P0 to the first eccentric position P1, and the organic solvent L4 is supplied to the second eccentric position P2.
- the second eccentric position P2 and the first eccentric position P1 are positions sandwiching the central position P0.
- the center position P0 is the center of the upper surface Wa of the substrate W.
- the supply position of the pure water L3 is moved from the first eccentric position P1 toward the direction opposite to the center position P0 (outward in the radial direction of the substrate W).
- the supply position of the organic solvent L4 is moved from the second eccentric position P2 to the center position P0.
- the supply position of the organic solvent L4 fixed at the center position P0 the supply position of the pure water L3 is moved until it reaches the peripheral edge of the substrate W.
- the pure water L3 can be replenished in front of the organic solvent L4, and the liquid film can be suppressed from being interrupted.
- step S105 the cleaning film F is sucked into the nozzle unit 60, and the cleaning film F is removed from above the nozzle unit 60.
- the drying of the cleaning film F can be suppressed, and the generation of particles due to the residue of the cleaning film F can be suppressed.
- the discharge line 72D is connected to the supply lines 72A and 72B.
- An on-off valve 75D for opening and closing the flow path and a flow rate controller 76D for controlling the flow rate are provided in the middle of the discharge line 72D.
- the on-off valve 75D opens the flow path, the cleaning film F is sucked into the nozzles 61A and 61B by gravity.
- step S106 the organic solvent L4 is supplied to the upper surface Wa of the substrate W.
- the organic solvent L4 is supplied from the nozzle 51 of the second liquid supply unit 50 to the center of the upper surface of the substrate W, wets and spreads over the entire upper surface by centrifugal force, and the pure water L3 remaining on the upper surface Wa is washed away, and the organic solvent L4 is applied to the upper surface Wa. Form a liquid film.
- step S107 as shown in FIG. 9, the supply position of the organic solvent L4 is moved from the center of the upper surface Wa of the substrate W to the peripheral edge.
- An opening is formed in the center of the liquid film of the organic solvent L4, and the opening gradually expands from the center of the upper surface Wa of the substrate W toward the peripheral edge.
- a gas such as N 2 gas may be supplied toward the opening edge of the liquid film of the organic solvent L4. The gas supply position moves following the supply position of the organic solvent L4.
- step S108 as shown in FIG. 10, the substrate W is held horizontally and rotated to dry the substrate W.
- a cleaning film F is formed on the nozzle unit 60 in step S104 in which pure water L3 is supplied to both the upper surface Wa and the lower surface Wb of the substrate W.
- the cleaning film F is formed on the nozzle unit 60 in step S106 of supplying the organic solvent L4 to the upper surface Wa of the substrate W as shown in FIG.
- the differences between the above-described embodiment and the present modification will be mainly described.
- step S106 the organic solvent L4 is supplied to the upper surface Wa of the substrate W.
- the organic solvent L4 is supplied from the nozzle 51 of the second liquid supply unit 50 to the center of the upper surface of the substrate W, wets and spreads over the entire upper surface by centrifugal force, and the pure water L3 remaining on the upper surface Wa is washed away, and the organic solvent L4 is applied to the upper surface Wa. Form a liquid film.
- step S106 one nozzle 61B of the nozzle unit 60 discharges pure water L3, and a cleaning film F of pure water L3 is formed on the nozzle unit 60. Since the cleaning film F is formed in the same manner as in the above embodiment, the same effect as in the above embodiment can be obtained in this modified example. Further, the nozzle unit 60 can be washed during the processing of the substrate W, and the decrease in throughput can be suppressed.
- step S107 as shown in FIG. 13, the supply position of the organic solvent L4 is moved from the center to the peripheral edge of the upper surface Wa of the substrate W.
- An opening is formed in the center of the liquid film of the organic solvent L4, and the opening gradually expands from the center of the upper surface Wa of the substrate W toward the peripheral edge.
- a gas such as N 2 gas may be supplied toward the opening edge of the liquid film of the organic solvent L4. The gas supply position moves following the supply position of the organic solvent L4.
- step S107 the cleaning film F is sucked into the nozzle unit 60, and the cleaning film F is removed from above the nozzle unit 60.
- the drying of the cleaning film F can be suppressed, and the generation of particles due to the residue of the cleaning film F can be suppressed.
- the substrate processing apparatus 10 includes a baffle plate 64.
- the baffle plate 64 is installed above the nozzle 61B forming the cleaning film F.
- the nozzle 61B discharges pure water L3 and forms a cleaning film F of pure water L3 on the nozzle unit 60.
- the cleaning film F covers all the nozzles 61A, 61B, and 61C of the nozzle unit 60.
- a ring 62 surrounding a plurality of nozzles 61A, 61B, 61C is provided on the upper surface of the nozzle unit 60.
- the ring 62 projects upward from the peripheral edge of the upper surface of the nozzle unit 60 and stores pure water L3 inside.
- the ring 62 has, for example, a first inclined portion 62a that inclines outward in the radial direction of the substrate W as it goes vertically upward from the peripheral edge of the upper surface of the nozzle unit 60, and a substrate that inclines vertically downward from the upper end of the first inclined portion 62a. Includes a second inclined portion 62b that inclines outward in the radial direction of W.
- the ring 62 further includes a cylindrical portion 62c that surrounds the outer peripheral surface of the nozzle unit 60. At the lower end of the cylindrical portion 62c, a flange portion 62d protruding inward of the cylindrical portion 62c is provided. A step is formed on the outer peripheral surface of the nozzle unit 60, and the flange portion 62d is brought into contact with the step. On the other hand, a first inclined portion 62a is provided at the upper end of the cylindrical portion 62c.
- the nozzle unit 60 is arranged inside the ring-shaped gutter 63.
- the gutter 63 stores the pure water L3 that overflows from the ring 62.
- the gutter 63 includes an inner wall 63a surrounding the nozzle unit 60, an outer wall 63b arranged outside the inner wall 63a, a groove 63c formed between the inner wall 63a and the outer wall 63b, and a bottom wall 63d forming the bottom of the groove 63c. And, including.
- gas such as N 2 gas is supplied between the inner wall 63a and the nozzle unit 60 of the trough 63.
- the baffle plate 64 is installed below the substrate W held by the holding portion 20.
- the baffle plate 64 is bridged, for example, to the ring 62.
- the baffle plate 64 receives the pure water L3 discharged upward from the nozzle 61B and changes the direction of the pure water L3 from upward to sideways. It is possible to suppress the adhesion of pure water L3 to the lower surface Wb of the substrate W, and reduce the number of particles adhering to the lower surface Wb of the substrate W.
- the nozzle 61B discharges pure water L3 in step S106 of supplying the organic solvent L4 to the upper surface Wa of the substrate W, for example.
- the baffle plate 64 suppresses the adhesion of the pure water L3 to the lower surface Wb of the substrate W, thereby suppressing the temperature change of the substrate W due to the adhesion of the pure water L3. As a result, the number of particles adhering to the lower surface Wb of the substrate W can be reduced.
- the nozzle 61B uses pure water L3 to collect the organic solvent L4 recovered in the cup 80 (see FIG. 1) by discharging pure water L3 in step S106 of supplying the organic solvent L4 to the upper surface Wa of the substrate W. Dilute.
- the pure water L3 After being stored inside the ring 62, the pure water L3 overflows to the outside of the ring 62 and flows on the rotating base plate 21.
- the pure water L3 flows outward in the radial direction of the base plate 21 by centrifugal force, mixes with the organic solvent L4 when shaken off from the base plate 21, and dilutes the organic solvent L4.
- the organic solvent L4 is recovered in the cup 80 in a state of being diluted with pure water L3, and is discharged to the outside of the cup 80 via the drainage pipe 84 without staying inside the cup 80. Therefore, the volatilization of the organic solvent L4 can be suppressed, and the concentration of the organic solvent L4 contained in the exhaust gas can be reduced. This effect is more remarkable as the discharge amount of pure water L3 is larger. Even if the discharge amount of pure water L3 is increased, the adhesion of pure water L3 to the substrate W can be suppressed by the baffle plate 64.
- the baffle plate 64 has, for example, a triangular columnar shape and includes a pair of tapered surfaces 64a and 64b (see FIG. 16) that taper upward.
- the pair of tapered surfaces 64a and 64b have an inverted V-shaped cross-sectional shape.
- the height of the lower surface 64c (see FIG. 16) of the baffle plate 64 is lower than the height of the upper end of the ring 62.
- the baffle plate 64 repels the pure water L3 inside the ring 62, and the pure water L3 can be reliably stored inside the ring 62. More preferably, the height of the upper end 64d (see FIG. 16) of the baffle plate 64 is lower than the height of the upper end of the ring 62.
- the baffle plate 64 can be accommodated inside the ring 62, and the interference between the baffle plate 64 and the substrate W can be suppressed.
- the lower surface 64c of the baffle plate 64 may be flat as shown in FIG. 16, but may include a conical recess 64e facing the nozzle 16B as shown in FIG. A downward flow can be formed by the recess 64e, and pure water L3 can be reliably stored inside the ring 62.
- through holes 64f and 64g may be formed laterally penetrating the baffle plate 64 from the recess 64d to the tapered surfaces 64a and 64b.
- the through holes 64g and 64g can form a lateral flow, and particles adhering to the tapered surfaces 64a and 64b can be washed away.
- the cleaning film F is formed after the first chemical solution L1 and the second chemical solution L2 are sequentially supplied to the lower surface Wb of the substrate W.
- the cleaning film F may be formed between the supply of the first chemical solution L1 and the supply of the second chemical solution L2, for example, in step S102.
- both the first chemical solution L1 and the second chemical solution L2 are supplied to the lower surface Wb of the substrate W, but only the first chemical solution L1 may be supplied.
- the droplets of the first chemical solution L1 adhering on the nozzle unit 60 can be removed by the cleaning film F.
- particles may be generated by the residue. If the droplets of the first chemical solution L1 are removed by the cleaning film F before the droplets of the first chemical solution L1 are dried, the generation of particles can be suppressed.
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Abstract
Description
61A ノズル
61B ノズル
F 洗浄膜
L1 第1薬液
L2 第2薬液
L3 純水
W 基板
Wa 上面
Wb 下面
Claims (15)
- 基板を水平に保持すると共に回転した状態で、前記基板の下面中央に対向配置される複数のノズルを含むノズルユニットから、前記基板の下面に、酸性又はアルカリ性の第1薬液と、純水と、をこの順番で供給することと、
前記基板を水平に保持すると共に回転し、前記基板を乾燥させることと、
前記第1薬液の供給後、前記基板の乾燥前に、前記ノズルユニットの一の前記ノズルから純水を吐出し、前記ノズルユニットの全ての前記ノズルを覆う純水の洗浄膜を前記ノズルユニットの上に形成することと、を有する、基板処理方法。 - 前記洗浄膜の形成中に、前記洗浄膜と、前記基板の前記下面とを隔てる空間が形成される、請求項1に記載の基板処理方法。
- 前記ノズルユニットの一の前記ノズルが前記基板の前記下面に純水を供給する間に、前記ノズルユニットの別の前記ノズルが前記洗浄膜を形成する、請求項1又は2に記載の基板処理方法。
- 前記ノズルユニットの全ての前記ノズルを囲むリングの内部に純水を溜め、前記洗浄膜を形成する、請求項1~3のいずれか1項に記載の基板処理方法。
- 前記洗浄膜の形成中に、前記リングの内部から外部に純水をオーバーフローさせることを含む、請求項4に記載の基板処理方法。
- 前記洗浄膜を形成する前記ノズルから上向きに吐出した純水を、前記基板よりも下方に設置したバッフルプレートで受け止め、上向きから横向きに方向転換させることを含む、請求項5に記載の基板処理方法。
- 前記バッフルプレートは、上方に向けて先細り状の一対のテーパ面を含む、請求項6に記載の基板処理方法。
- 前記バッフルプレートは、前記洗浄膜を形成する前記ノズルに相対する円錐状のくぼみを下面に含む、請求項6又は7に記載の基板処理方法。
- 前記バッフルプレートは、上方に向けて先細り状の一対のテーパ面を含み、前記洗浄膜を形成する前記ノズルに相対する円錐状のくぼみを下面に含み、
前記くぼみから前記テーパ面まで横方向に前記バッフルプレートを貫通する貫通穴が形成されている、請求項6に記載の基板処理方法。 - 前記バッフルプレートの下面の高さは、前記リングの上端の高さよりも低い、請求項6~9のいずれか1項に記載の基板処理方法。
- 前記基板の乾燥前に、前記ノズルユニットの上から前記洗浄膜を除去することを含む、請求項1~10のいずれか1項に記載の基板処理方法。
- 前記洗浄膜は、予め温調された純水で形成される、請求項1~11のいずれか1項に記載の基板処理方法。
- 前記ノズルユニットは、前記第1薬液と、前記第1薬液とは異なる第2薬液とを、順番に前記基板の前記下面に供給し、その後に、前記洗浄膜の形成を行い、
前記第1薬液と前記第2薬液は、一方が酸性であり、他方がアルカリ性である、請求項1~12のいずれか1項に記載の基板処理方法。 - 前記基板の上面に、前記第1薬液と、純水と、有機溶剤と、をこの順番で供給することを有し、
前記有機溶剤の供給中に、前記洗浄膜の形成を行う、請求項1~13のいずれか1項に記載の基板処理方法。 - 基板を水平に保持する保持部と、
前記保持部を回転させる回転部と、
前記保持部で水平に保持された前記基板の下面中央に対向配置される複数のノズルを含むノズルユニットと、
前記ノズルユニットに対して、酸性又はアルカリ性の第1薬液と、純水と、を供給する流体供給ユニットと、
前記回転部と前記流体供給ユニットを制御する制御部と、を有し、
前記制御部は、
前記基板を水平に保持すると共に回転した状態で、前記ノズルユニットから前記基板の下面に、前記第1薬液と純水とをこの順番で供給することと、
前記基板を水平に保持すると共に回転させ、前記基板を乾燥させることと、
前記第1薬液の供給後、前記基板の乾燥前に、前記ノズルユニットの一の前記ノズルから純水を吐出し、前記ノズルユニットの全ての前記ノズルを覆う純水の洗浄膜を前記ノズルユニットの上に形成することと、を実施する、基板処理装置。
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