WO2021079779A1 - 基板洗浄方法、および基板洗浄装置 - Google Patents
基板洗浄方法、および基板洗浄装置 Download PDFInfo
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- WO2021079779A1 WO2021079779A1 PCT/JP2020/038507 JP2020038507W WO2021079779A1 WO 2021079779 A1 WO2021079779 A1 WO 2021079779A1 JP 2020038507 W JP2020038507 W JP 2020038507W WO 2021079779 A1 WO2021079779 A1 WO 2021079779A1
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- Prior art keywords
- nozzle
- gas
- cluster
- substrate
- supply
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- 239000000758 substrate Substances 0.000 title claims abstract description 144
- 238000004140 cleaning Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 197
- 239000012159 carrier gas Substances 0.000 claims abstract description 65
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000003507 refrigerant Substances 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 2
- 238000005507 spraying Methods 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 35
- 230000007547 defect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000003028 elevating effect Effects 0.000 description 7
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000005411 Van der Waals force Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- JOHWNGGYGAVMGU-UHFFFAOYSA-N trifluorochlorine Chemical compound FCl(F)F JOHWNGGYGAVMGU-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- 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
- H01L21/67023—Apparatus for fluid treatment for general liquid treatment, e.g. etching followed by cleaning
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45563—Gas nozzles
-
- 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
- H01L21/04—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
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67103—Apparatus for thermal treatment mainly by conduction
-
- 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
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67109—Apparatus for thermal treatment mainly by convection
Definitions
- This disclosure relates to a substrate cleaning method and a substrate cleaning apparatus.
- the substrate cleaning method described in Patent Document 1 includes a step of forming a chlorine trifluoride cluster by injecting a mixed gas of chlorine trifluoride gas and an argon gas from a nozzle, and forming the formed cluster into a silicon single crystal. It has a step of colliding with the surface.
- One aspect of the present disclosure provides a technique capable of suppressing the occurrence of defects in the substrate when the injection of the mixed gas of the cluster forming gas and the carrier gas toward the substrate is completed.
- the step of forming the cluster by injecting the mixed gas from the nozzle, and
- the process of removing particles adhering to the substrate by the cluster and It has a step of continuing to supply the carrier gas to the nozzle for a set time from the time when the supply of the cluster-forming gas to the nozzle is finished.
- FIG. 1 is a side view showing a substrate cleaning device according to an embodiment.
- FIG. 2 is a plan view showing a nozzle moving mechanism according to an embodiment.
- FIG. 3 is a cross-sectional view showing the formation of a cluster according to an embodiment.
- FIG. 4 is a diagram showing the components of the control unit according to the embodiment as functional blocks.
- FIG. 5 is a flowchart showing a substrate cleaning method according to an embodiment.
- FIG. 6 is a diagram showing the operation timing of the substrate cleaning device according to the embodiment.
- FIG. 7 is a diagram showing a state of contamination of the substrate after cleaning according to the embodiment.
- FIG. 8 is a diagram showing a state of contamination of the substrate after cleaning according to the conventional example.
- the same or corresponding configurations may be designated by the same or corresponding reference numerals, and the 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
- the Z-axis direction is the vertical direction.
- “downward” means downward in the vertical direction (negative direction on the Z axis)
- “upper” means upward in the vertical direction (positive direction on the Z axis).
- FIG. 1 is a side view showing a substrate cleaning device according to an embodiment.
- the substrate cleaning device 10 removes particles 5 (see FIG. 3) adhering to the main surface 3 of the substrate 2 by injecting gas toward the main surface 3 of the substrate 2.
- the substrate 2 is a semiconductor substrate such as a silicon wafer.
- the substrate cleaning device 10 includes a processing container 20, a substrate holding unit 30, a rotating shaft unit 34, a rotating drive unit 36, an elevating drive unit 38, a nozzle 40, a drive unit 50, a gas supply unit 60, and the like. It includes a gas suction unit 70 and a control unit 90.
- the processing container 20 has a space inside in which the substrate 2 is processed.
- the inside of the processing container 20 is, for example, a columnar space.
- the processing container 20 has a gate (not shown) that is an inlet / outlet of the substrate 2 and a gate valve (not shown) that opens and closes the gate.
- the substrate holding portion 30 is arranged inside the processing container 20 and has a substrate holding surface 31 for holding the substrate 2.
- the substrate holding portion 30 holds the substrate 2 horizontally, for example, with the main surface 3 from which the particles 5 of the substrate 2 are removed facing upward.
- the rotating shaft portion 34 extends downward from the center of the substrate holding portion 30 and is arranged vertically.
- the upper end portion of the rotating shaft portion 34 is arranged inside the processing container 20, and the lower end portion of the rotating shaft portion 34 is arranged outside the processing container 20.
- the rotation drive unit 36 rotates the substrate holding unit 30 by rotating the rotation shaft unit 34 around the vertical axis.
- the rotary drive unit 36 has, for example, a rotary motor and a transmission mechanism that transmits the rotary drive force of the rotary motor to the rotary shaft portion 34.
- the elevating drive unit 38 raises and lowers the substrate holding unit 30.
- the elevating drive unit 38 is composed of, for example, a fluid pressure cylinder or the like.
- the elevating drive unit 38 raises and lowers the substrate holding unit 30 via the rotation drive unit 36, but the substrate holding unit 30 may be moved up and down without the rotation drive unit 36.
- the nozzle 40 injects gas toward the main surface 3 of the substrate 2 held by the substrate holding portion 30.
- the nozzle 40 is arranged above the substrate holding portion 30 with the gas injection port 41 facing downward.
- the nozzle 40 for example, injects gas in a direction perpendicular to the main surface 3 of the substrate 2 held by the substrate holding portion 30 (for example, in the vertical direction). Since the gas collides perpendicularly with the main surface 3 of the substrate 2, it is possible to suppress the pattern collapse of the uneven pattern formed in advance on the main surface 3 of the substrate 2.
- the drive unit 50 moves the nozzle 40 in the radial direction of the substrate holding unit 30.
- the drive unit 50 moves the nozzle 40 between a position directly above the central portion of the substrate holding portion 30 and a position directly above the outer peripheral portion of the substrate holding portion 30. Further, the drive unit 50 moves the nozzle 40 to a position outside the radial direction of the substrate holding unit 30.
- the position outside the radial direction of the substrate holding portion 30 is a standby position that stands by when gas is not injected.
- FIG. 2 is a plan view showing a drive unit according to an embodiment.
- the drive unit 50 includes, for example, a swivel arm 51 and a swivel drive unit 52 that swivels the swivel arm 51.
- the swivel arm 51 is arranged horizontally, and holds the nozzle 40 at its tip with the injection port 41 of the nozzle 40 facing downward.
- the swivel drive unit 52 swivels the swivel arm 51 around a swivel shaft 53 extending downward from the base end portion of the swivel arm 51.
- the drive unit 50 may have a guide rail and a linear motion mechanism instead of the swivel arm 51 and the swivel drive unit 52.
- the guide rails are arranged horizontally and a linear motion mechanism moves the nozzle 40 along the guide rails.
- the drive unit 50 may further include an elevating drive unit 54 for raising and lowering the nozzle 40.
- the elevating drive unit 54 is composed of, for example, a fluid pressure cylinder or the like.
- the elevating drive unit 54 raises and lowers the nozzle 40 via the swivel drive unit 52, but the nozzle 40 may be moved up and down without going through the swivel drive unit 52.
- the gas supply unit 60 supplies the cluster-forming gas to the nozzle 40.
- the cluster-forming gas is injected from the nozzle 40. Since the cluster-forming gas adiabatically expands inside the processing container 20 that has been depressurized in advance, it is cooled to the condensation temperature and forms a cluster 4 that is an aggregate of molecules or atoms.
- the clustering gas comprises at least one gas selected from, for example, carbon dioxide (CO 2 ) gas and argon (Ar) gas.
- the gas supply unit 60 supplies the carrier gas to the nozzle 40.
- the carrier gas has a smaller molecular weight or atomic weight than the clustering gas. Therefore, the carrier gas has a higher condensation temperature than the clustering gas. Therefore, the carrier gas does not form cluster 4.
- the carrier gas includes, for example, at least one gas selected from hydrogen (H 2 ) gas and helium (He) gas.
- the gas supply unit 60 supplies a mixed gas of the cluster forming gas and the carrier gas to the nozzle 40.
- CO 2 gas is used as the cluster forming gas
- H 2 gas is used as the carrier gas.
- the combination of the cluster-forming gas and the carrier gas is not particularly limited.
- the gas supply unit 60 includes a common line L1 whose downstream end is connected to the nozzle 40, a first branch line L2 extending from the upstream end of the common line L1 to the first supply source 61, and a second from the upstream end of the common line L1. It has a second branch line L3 extending to the supply source 62.
- the first supply source 61 is a source of CO 2 gas.
- the second supply source 62 is a supply source of H 2 gas.
- the common line L1 is provided with a pressure regulator 63 for adjusting the gas supply pressure P to the nozzle 40.
- the pressure regulator 63 adjusts the gas supply pressure P to the nozzle 40 under the control of the control unit 90.
- a booster such as a gas booster may be further provided on the upstream side of the pressure regulator 63 of the common line L1.
- the first branch line L2 is provided with a first on-off valve 64 and a first flow rate adjusting valve 65.
- the control unit 90 opens the first on-off valve 64, CO 2 gas is supplied from the first supply source 61 to the nozzle 40. During this time, the control unit 90 adjusts the flow rate of the CO 2 gas by the first flow rate adjusting valve 65.
- the control unit 90 closes the first on-off valve 64, the supply of CO 2 gas from the first supply source 61 to the nozzle 40 is stopped.
- the second branch line L3 is provided with a second on-off valve 66 and a second flow rate adjusting valve 67.
- H 2 gas is supplied from the second supply source 62 to the nozzle 40.
- the control unit 90 adjusts the flow rate of the H 2 gas by the second flow rate adjusting valve 67.
- the control unit 90 closes the second on-off valve 66, the supply of H 2 gas from the second supply source 62 to the nozzle 40 is stopped.
- the gas suction unit 70 depressurizes the inside of the processing container 20.
- the gas suction unit 70 includes, for example, a suction pump 71 that sucks the gas inside the processing container 20, a suction line 72 that extends from the suction port 27 formed on the inner wall surface 22 of the processing container 20 to the suction pump 71, and a suction line. It has a pressure regulator 73 provided in the middle of 72. The pressure regulator 73 adjusts the air pressure inside the processing container 20 under the control of the control unit 90.
- FIG. 3 is a cross-sectional view showing the formation of a cluster according to an embodiment.
- the nozzle 40 is, for example, generally called a Laval nozzle, and has a throat 43 having a diameter smaller than that of both the injection port 41 and the supply port 42.
- the nozzle 40 has a tapered hole 45 between the throat 43 and the injection port 41 whose diameter increases from the throat 43 toward the injection port 41.
- the nozzle 40 is arranged inside the processing container 20.
- the inside of the processing container 20 is decompressed in advance by the gas suction unit 70.
- the gas supplied to the supply port 42 of the nozzle 40 is accelerated by passing through the throat 43 and is injected from the injection port 41.
- the injected CO 2 gas adiabatically expands inside the processing container 20 that has been decompressed in advance, so that it is cooled to the condensation temperature.
- the CO 2 molecules are bonded to each other by the van der Waals force, and the cluster 4, which is an aggregate of the CO 2 molecules, is formed.
- the cluster 4 collides with the particles 5 adhering to the main surface 3 of the substrate 2 and blows off the particles 5.
- the cluster 4 can also blow off the particles 5 around the collision position by colliding with the main surface 3 without directly colliding with the particles 5. Since the cluster 4 becomes hot due to the collision, it is disassembled into pieces and sucked by the gas suction unit 70.
- the size of the cluster 4 is too small, the removal efficiency of the particles 5 is too low.
- the size of the cluster 4 is too large, the uneven pattern formed in advance on the main surface 3 of the substrate 2 collapses. Further, if the size of the cluster 4 is too large, stain-like defects may occur on the main surface 3 of the substrate 2.
- the size of cluster 4 is adjusted.
- the size of the cluster 4 can be adjusted by, for example, the supply pressure P of the gas to the nozzle 40, the flow rate ratio of the cluster forming gas and the carrier gas, the air pressure inside the processing container 20, and the like.
- the gas supply pressure P to the nozzle 40 is, for example, 0.5 MPa to 5 MPa, preferably 0.5 MPa to 0.9 MPa.
- the flow rate ratio of the cluster forming gas to the carrier gas is, for example, 10:90 to 90:10.
- the flow rate means a normal flow rate (unit: slm) measured at 0 ° C. and atmospheric pressure.
- the temperature of the nozzle 40 is, for example, ⁇ 50 ° C. to ⁇ 10 ° C.
- the atmospheric pressure inside the processing container 20 is, for example, 5 Pa to 120 Pa.
- the control unit 90 is composed of, 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 cleaning device 10.
- the control unit 90 controls the operation of the substrate cleaning device 10 by causing the CPU 91 to execute the program stored in the storage medium 92.
- the control unit 90 includes an input interface 93 and an output interface 94.
- the control unit 90 receives a signal from the outside through the input interface 93, and transmits the signal to the outside through the output interface 94.
- Such a program may be stored in a storage medium readable by a computer, and may be installed from the storage medium in the storage medium 92 of the control unit 90.
- Examples of the storage medium that can be read by a computer include a hard disk (HD), a flexible disk (FD), a compact disk (CD), a magnet optical desk (MO), and a memory card.
- the program may be downloaded from the server via the Internet and installed on the storage medium 92 of the control unit 90.
- FIG. 4 is a diagram showing the components of the control unit according to the embodiment as functional blocks.
- Each functional block illustrated in FIG. 4 is conceptual and does not necessarily have to be physically configured as shown. All or part of each functional block can be functionally or physically distributed / integrated in any unit.
- Each processing function performed in each function block may be realized by a program executed by a CPU, or as hardware by wired logic, in whole or in an arbitrary part thereof.
- the control unit 90 includes a gas supply control unit 95, a heater control unit 96, a refrigerant supply control unit 97, and a relative position control unit 98.
- the gas supply control unit 95 controls the gas supply unit 60.
- the gas supply unit 60 supplies the cluster forming gas and the carrier gas to the nozzle 40.
- the heater control unit 96 controls the heater 80.
- the heater 80 heats the nozzle 40.
- the heater 80 is, for example, a heating wire arranged inside the nozzle 40.
- the refrigerant supply control unit 97 controls the refrigerant supply unit 81.
- the refrigerant supply unit 81 adjusts the temperature of the nozzle 40 by supplying the refrigerant to the nozzle 40.
- a flow path through which the refrigerant flows is formed around the nozzle 40.
- the refrigerant may be either a gas or a liquid.
- the temperature of the refrigerant is lower than room temperature, and when the refrigerant supply control unit 97 prohibits the supply of the refrigerant to the nozzle 40, the temperature of the nozzle 40 naturally rises without heating the nozzle 40.
- the relative position control unit 98 controls the drive unit 50.
- the drive unit 50 sets the relative positions of the nozzle 40 and the substrate holding unit 30 at a position where gas is injected from the nozzle 40 toward the substrate 2 and a position where gas is injected from the nozzle 40 toward the outside of the substrate 2. Move between.
- FIG. 5 is a flowchart showing a substrate cleaning method according to an embodiment. Each step shown in FIG. 5 is carried out under the control of the control unit 90.
- the substrate cleaning method includes a step S101 of carrying the substrate 2 into the processing container 20.
- a transfer device (not shown) carries the substrate 2 into the processing container 20 from the outside of the processing container 20, and arranges the carried-in substrate 2 on the substrate holding surface 31 of the substrate holding portion 30.
- the substrate holding portion 30 holds the substrate 2 horizontally with the main surface 3 of the substrate 2 facing upward.
- the substrate cleaning method includes a step S102 of supplying a mixed gas of a cluster forming gas and a carrier gas to the nozzle 40.
- the gas supply unit 60 supplies the mixed gas to the nozzle 40.
- the cluster-forming gas is, for example, CO 2 gas
- the carrier gas is, for example, H 2 gas.
- the carrier gas raises the gas supply pressure P to the nozzle 40 to a desired atmospheric pressure while suppressing the liquefaction of the cluster-forming gas inside the nozzle 40.
- the adiabatic expansion of the cluster-forming gas that is, the acceleration of the cluster-forming gas is not sufficient, and the cluster 4 does not grow to a size sufficient for removing the particles 5.
- the supply pressure P is increased to a desired pressure using only the cluster-forming gas, the pressure of the cluster-forming gas exceeds the saturated vapor pressure, and the cluster-forming gas is liquefied inside the nozzle 40.
- the carrier gas suppresses the liquefaction of the cluster-forming gas inside the nozzle 40 by lowering the partial pressure of the cluster-forming gas. Further, the carrier gas can sufficiently accelerate the cluster-forming gas by increasing the gas supply pressure P to the nozzle 40 to a desired atmospheric pressure, and the cluster 4 can grow to a size sufficient for removing the particles 5.
- the gas suction unit 70 sucks the gas inside the processing container 20 to keep the air pressure inside the processing container 20 constant.
- the substrate cleaning method includes a step S103 of forming a cluster 4 by injecting a mixed gas from a nozzle 40. Since the CO 2 gas contained in the mixed gas adiabatically expands inside the processing container 20 that has been depressurized in advance, it is cooled to the condensation temperature. As a result, the CO 2 molecules are bonded to each other by the van der Waals force, and the cluster 4, which is an aggregate of the CO 2 molecules, is formed.
- the substrate cleaning method includes a step S104 of removing particles 5 adhering to the main surface 3 of the substrate 2 by the cluster 4.
- the cluster 4 collides with the particles 5 and blows off the particles 5.
- the cluster 4 can also blow off the particles 5 around the collision position by colliding with the main surface 3 without directly colliding with the particles 5.
- the above steps S102 to S104 are repeated while changing the position where the cluster 4 on the main surface 3 of the substrate 2 collides.
- the change is carried out, for example, by moving the nozzle 40 in the radial direction of the substrate 2 while the rotation driving unit 36 rotates the substrate holding unit 30.
- the cluster 4 can collide with the entire main surface 3 of the substrate 2, and the entire main surface 3 of the substrate 2 can be cleaned.
- the position where the cluster 4 on the main surface 3 of the substrate 2 collides is changed by rotating the substrate holding portion 30 and moving the nozzle 40 in the radial direction of the substrate 2.
- the substrate holding portion 30 may be moved in the X-axis direction and the Y-axis direction with the nozzle 40 fixed.
- step S105 the end of the supply of the cluster-forming gas to the nozzle 40
- step S107 the end of the supply of the carrier gas to the nozzle 40
- the substrate cleaning method includes a step S105 for ending the supply of the cluster forming gas to the nozzle 40.
- the gas supply control unit 95 closes the first on-off valve 64 and ends supplying the cluster-forming gas to the nozzle 40.
- the gas supply control unit 95 keeps opening the second on-off valve 66 without closing the second on-off valve 66.
- the substrate cleaning method includes a step S106 in which the carrier gas is continuously supplied to the nozzle 40 for a set time ⁇ t from the time when the supply of the cluster forming gas to the nozzle 40 is completed.
- the gas supply control unit 95 continues to open the second on-off valve 66 and continues to supply the carrier gas to the nozzle 40.
- the cluster-forming gas remaining inside the nozzle 40 can be replaced with a carrier gas.
- the set time ⁇ t is predetermined by experiments or the like so that the cluster-forming gas does not liquefy inside the nozzle 40, that is, the partial pressure of the cluster-forming gas is sufficiently lower than the saturated vapor pressure, as will be described later. ..
- the substrate cleaning method includes a step S107 for terminating the supply of the carrier gas to the nozzle 40.
- the gas supply control unit 95 closes the second on-off valve 66 and ends supplying the carrier gas to the nozzle 40.
- the gas supply control unit 95 ends the supply of the carrier gas to the nozzle 40 after replacing the cluster-forming gas remaining inside the nozzle 40 with the carrier gas.
- the substrate cleaning method includes a step S108 of carrying out the substrate 2 from the inside of the processing container 20 to the outside of the processing container 20.
- the substrate holding portion 30 releases the holding of the substrate 2
- a transport device (not shown) receives the substrate 2 from the substrate holding portion 30, and receives the received substrate 2 from the inside of the processing container 20 to the outside of the processing container 20. Carry out to. After that, this process ends.
- step S105 the end of supply of the cluster-forming gas to the nozzle 40 (step S105) and the end of supply of the carrier gas to the nozzle 40 (step S107) have been performed at the same time. This was one of the causes of causing stain-like defects on the main surface 3 of the substrate 2.
- the carrier gas will escape from the nozzle 40 before the cluster-forming gas. This is because the molecular weight or atomic weight of the carrier gas is smaller than the molecular weight or atomic weight of the cluster-forming gas.
- the ratio of the cluster forming gas to the internal space of the nozzle 40 increases.
- the cluster-forming gas or impurities inevitably contained in the cluster-forming gas may be liquefied in the internal space of the nozzle 40.
- the substrate cleaning method of the present embodiment includes a step S106 in which the carrier gas is continuously supplied to the nozzle 40 for a set time ⁇ t from the end of the supply of the cluster forming gas.
- the supply of the carrier gas to the nozzle 40 is terminated.
- the supply of the carrier gas to the nozzle 40 is terminated.
- FIG. 6 is a diagram showing the operation timing of the substrate cleaning device according to the embodiment.
- the gas supply control unit 95 starts supplying both the cluster forming gas and the carrier gas to the nozzle 40 at time t0.
- the gas supply control unit 95 supplies both the cluster forming gas and the carrier gas to the nozzle 40 from time t0 to time t1.
- the gas supply control unit 95 supplies the carrier gas to the nozzle 40 at the first flow rate FR1 from the time t0 to the time t1.
- the heater control unit 96 prohibits the heater 80 from heating the nozzle 40 from the time t0 to the time t1. As a result, the nozzle 40 can be cooled to near the condensation temperature of the cluster forming gas, and the formation of the cluster 4 can be supported.
- the refrigerant supply control unit 97 supplies the refrigerant to the nozzle 40 from time t0 to time t1. As a result, the nozzle 40 can be cooled to near the condensation temperature of the cluster forming gas, and the formation of the cluster 4 can be supported.
- the gas supply control unit 95 ends supplying the cluster-forming gas to the nozzle 40 at time t1. Subsequently, the gas supply control unit 95 continues to supply the carrier gas to the nozzle 40 from the time t1 to the time t2. The time from time t1 to time t2 is the set time ⁇ t.
- the gas supply control unit 95 supplies the carrier gas to the nozzle 40 from time t1 to time t2 at a second flow rate FR2 (FR2> FR1) that is larger than the first flow rate FR1.
- FR2 second flow rate
- the cluster-forming gas remaining inside the nozzle 40 can be quickly replaced with the carrier gas.
- the timing of switching the flow rate of the carrier gas from the first flow rate FR1 to the second flow rate FR2 does not have to be time t1, and may be immediately before time t1 or after time t1.
- the gas supply control unit 95 may supply the carrier gas to the nozzle 40 at the second flow rate FR2 during the set time ⁇ t.
- the cluster-forming gas remaining inside the nozzle 40 can be quickly replaced with the carrier gas.
- the heater control unit 96 heats the nozzle 40 with the heater 80 from time t1 to time t2. Since heat is supplied to the nozzle 40, the temperature of the nozzle 40 becomes high. As a result, it is possible to suppress the liquefaction of the cluster-forming gas or its impurities inside the nozzle 40.
- the timing for starting heating of the nozzle 40 does not have to be time t1, and may be immediately before time t1 or after time t1.
- the heater control unit 96 may heat the nozzle 40 with the heater 80 during the set time ⁇ t. Since heat is supplied to the nozzle 40, the temperature of the nozzle 40 becomes high. As a result, it is possible to suppress the liquefaction of the cluster-forming gas or its impurities inside the nozzle 40.
- the refrigerant supply control unit 97 prohibits the supply of the refrigerant to the nozzle 40 from the time t1 to the time t2. Since the refrigerant is not supplied to the nozzle 40, the temperature of the nozzle 40 becomes high. As a result, it is possible to suppress the liquefaction of the cluster-forming gas or its impurities inside the nozzle 40.
- the timing for ending the supply of the refrigerant does not have to be time t1, and may be immediately before time t1 or after time t1.
- the refrigerant supply control unit 97 may prohibit the supply of the refrigerant to the nozzle 40 during the set time ⁇ t. Since the refrigerant is not supplied to the nozzle 40, the temperature of the nozzle 40 naturally rises without heating the nozzle 40. As a result, it is possible to suppress the liquefaction of the cluster-forming gas or its impurities inside the nozzle 40.
- the relative position control unit 98 sets the relative position between the nozzle 40 and the substrate 2 at a position where gas is injected from the nozzle 40 toward the substrate 2 from time t1 to time t2. If the relative position between the nozzle 40 and the substrate 2 is set to a position where the gas is injected from the nozzle 40 toward the outside of the substrate 2 from the time t1 to the time t2, the gas collides with the inner wall surface of the processing container 20. .. As a result, the deposits adhering to the inner wall surface of the processing container 20 are peeled off. The exfoliated deposits may fly up and adhere to the main surface 3 of the substrate 2.
- the relative position control unit 98 sets the relative position between the nozzle 40 and the substrate 2 at a position where gas is injected from the nozzle 40 toward the substrate 2 from time t1 to time t2.
- the gas injected from the nozzle 40 collides with the substrate 2 to weaken the flow velocity.
- the gas having a low flow velocity collides with the inner wall surface of the processing container 20. Therefore, it is possible to prevent the deposits adhering to the inner wall surface of the processing container 20 from peeling off, and to prevent the deposits from adhering to the main surface 3 of the substrate 2.
- FIG. 7 is a diagram showing a state of contamination of the substrate after cleaning according to the embodiment.
- FIG. 8 is a diagram showing a state of contamination of the substrate after cleaning according to the conventional example.
- black dots represent the location of defects.
- the supply pressure P of the mixed gas to the nozzle 40 is 0.9 MPa
- the flow rate ratio of the cluster forming gas and the carrier gas is 25:75
- the temperature of the nozzle 40 is At ⁇ 40 ° C.
- the pressure inside the processing container 20 was, for example, 100 Pa
- the distance between the nozzle 40 and the substrate 2 was 60 mm.
- the cluster-forming gas was CO 2 gas
- the carrier gas was H 2 gas.
- the set time ⁇ t was 30 seconds.
- the substrate was washed in the same manner as in the embodiment shown in FIG. 7, except that the supply of the cluster forming gas was terminated and the supply of the carrier gas was terminated at the same time.
- stain-like defects are formed on the main surface 3 of the substrate 2 by continuing to supply the carrier gas to the nozzle 40 for a set time ⁇ t from the end of the supply of the cluster forming gas. It can be seen that the occurrence can be suppressed.
- the substrate 2 of the above embodiment is a silicon wafer, but it may be a silicon carbide substrate, a sapphire substrate, a glass substrate, or the like.
- Substrate 3 Main surface 4
- Cluster 5 Particle 10
- Substrate cleaning device 20 Processing container 30
- Substrate holding unit 40 Nozzle 50 Drive unit 60
- Gas supply unit 80 Heater 81 Refrigerant supply unit 90
- Control unit 95 Gas supply control unit 96 Heater control unit 97 Refrigerant supply Control unit 98 Relative position control unit
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Abstract
Description
断熱膨張によってクラスターを形成するクラスター形成ガスと、前記クラスター形成ガスよりも小さな分子量または原子量を有するキャリアガスとの混合ガスを、ノズルに供給する工程と、
前記ノズルから前記混合ガスを噴射することにより、前記クラスターを形成する工程と、
前記クラスターによって基板に付着したパーティクルを除去する工程と、
前記クラスター形成ガスを前記ノズルに供給するのを終了する時から設定時間、前記キャリアガスを前記ノズルに供給し続ける工程とを有する。
3 主表面
4 クラスター
5 パーティクル
10 基板洗浄装置
20 処理容器
30 基板保持部
40 ノズル
50 駆動部
60 ガス供給部
80 ヒータ
81 冷媒供給部
90 制御部
95 ガス供給制御部
96 ヒータ制御部
97 冷媒供給制御部
98 相対位置制御部
Claims (12)
- 断熱膨張によってクラスターを形成するクラスター形成ガスと、前記クラスター形成ガスよりも小さな分子量または原子量を有するキャリアガスとの混合ガスを、ノズルに供給する工程と、
前記ノズルから前記混合ガスを噴射することにより、前記クラスターを形成する工程と、
前記クラスターによって基板に付着したパーティクルを除去する工程と、
前記クラスター形成ガスを前記ノズルに供給するのを終了する時から設定時間、前記キャリアガスを前記ノズルに供給し続ける工程とを有する、基板洗浄方法。 - 前記混合ガスを前記ノズルに供給する工程は、第1の流量で前記キャリアガスを前記ノズルに供給する工程を含み、
前記設定時間中に、前記第1の流量よりも多い第2の流量で前記キャリアガスを前記ノズルに供給する工程を含む、請求項1に記載の基板洗浄方法。 - 前記混合ガスを前記ノズルに供給する工程中に、ヒータで前記ノズルを加熱するのを禁止する工程を有し、
前記設定時間中に、前記ノズルをヒータで加熱する工程を有する、請求項1または2に記載の基板洗浄方法。 - 前記混合ガスを前記ノズルに供給する工程中に、冷媒を前記ノズルに供給する工程と、
前記設定時間中に、前記冷媒を前記ノズルに供給するのを禁止する工程を有する、請求項1~3のいずれか1項に記載の基板洗浄方法。 - 前記設定時間、前記ノズルと前記基板との相対位置を、前記ノズルから前記基板に向けてガスを噴射する位置に据える工程を有する、請求項1~4のいずれか1項に記載の基板洗浄方法。
- 前記クラスター形成ガスは、二酸化炭素ガスおよびアルゴンガスから選ばれる1つ以上のガスを含み、
前記キャリアガスは、水素ガスおよびヘリウムガスから選ばれる1つ以上のガスを含む、請求項1~5のいずれか1項に記載の基板洗浄方法。 - 基板を保持する基板保持部と、
前記基板保持部で保持されている前記基板に対してガスを噴射するノズルと、
前記ノズルからの噴射によって断熱膨張してクラスターを形成するクラスター形成ガスと、前記クラスター形成ガスよりも小さな分子量または原子量を有するキャリアガスとを前記ノズルに供給するガス供給部と、
前記ガス供給部を制御するガス供給制御部とを備え、
前記ガス供給制御部は、前記クラスター形成ガスと前記キャリアガスとの混合ガスを前記ノズルに供給し、前記クラスター形成ガスを前記ノズルに供給するのを終了する時から設定時間、前記キャリアガスを前記ノズルに供給し続ける、基板洗浄装置。 - 前記ガス供給制御部は、
前記混合ガスを前記ノズルに供給する工程中に、第1の流量で前記キャリアガスを前記ノズルに供給し、
前記設定時間中に、前記第1の流量よりも多い第2の流量で前記キャリアガスを前記ノズルに供給する、請求項7に記載の基板洗浄装置。 - 前記ノズルを加熱するヒータと、
前記ヒータを制御するヒータ制御部とを備え、
前記ヒータ制御部は、
前記混合ガスを前記ノズルに供給する工程中に、前記ヒータで前記ノズルを加熱するのを禁止し、
前記設定時間中に、前記ヒータで前記ノズルを加熱する、請求項7または8に記載の基板洗浄装置。 - 冷媒を前記ノズルに供給することにより、前記ノズルの温度を調節する冷媒供給部と、
前記冷媒供給部を制御する冷媒供給制御部とを備え、
前記冷媒供給制御部は、
前記混合ガスを前記ノズルに供給する工程中に、前記冷媒を前記ノズルに供給し、
前記設定時間中に、前記冷媒を前記ノズルに供給するのを禁止する、請求項7~9のいずれか1項に記載の基板洗浄装置。 - 前記ノズルと前記基板保持部とを相対的に移動する駆動部と、
前記駆動部を制御する相対位置制御部とを備え、
前記相対位置制御部は、前記設定時間、前記ノズルと前記基板保持部との相対位置を、前記ノズルから前記基板保持部で保持されている前記基板に向けてガスを噴射する位置に据える、請求項7~10のいずれか1項に記載の基板洗浄装置。 - 前記クラスター形成ガスは、二酸化炭素ガスおよびアルゴンガスから選ばれる1つ以上のガスを含み、
前記キャリアガスは、水素ガスおよびヘリウムガスから選ばれる1つ以上のガスを含む、請求項7~11のいずれか1項に記載の基板洗浄装置。
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