WO2013146982A1 - トラップ機構、排気系及び成膜装置 - Google Patents
トラップ機構、排気系及び成膜装置 Download PDFInfo
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- WO2013146982A1 WO2013146982A1 PCT/JP2013/059186 JP2013059186W WO2013146982A1 WO 2013146982 A1 WO2013146982 A1 WO 2013146982A1 JP 2013059186 W JP2013059186 W JP 2013059186W WO 2013146982 A1 WO2013146982 A1 WO 2013146982A1
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- Prior art keywords
- gas
- exhaust
- passage
- trap mechanism
- space
- Prior art date
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- 230000007246 mechanism Effects 0.000 title claims abstract description 94
- 230000015572 biosynthetic process Effects 0.000 title abstract description 4
- 238000004891 communication Methods 0.000 claims abstract description 82
- 238000001816 cooling Methods 0.000 claims abstract description 55
- 239000010408 film Substances 0.000 claims abstract description 42
- 238000005192 partition Methods 0.000 claims abstract description 26
- 239000010409 thin film Substances 0.000 claims abstract description 17
- 238000000638 solvent extraction Methods 0.000 claims abstract 2
- 239000007789 gas Substances 0.000 claims description 326
- 238000012545 processing Methods 0.000 claims description 40
- 239000011261 inert gas Substances 0.000 claims description 34
- 238000011144 upstream manufacturing Methods 0.000 claims description 22
- 230000002265 prevention Effects 0.000 claims description 12
- 239000002826 coolant Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims 1
- 230000014759 maintenance of location Effects 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 description 52
- 239000007788 liquid Substances 0.000 description 40
- 238000004140 cleaning Methods 0.000 description 26
- 239000003507 refrigerant Substances 0.000 description 21
- 239000004065 semiconductor Substances 0.000 description 14
- 239000012159 carrier gas Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 238000010926 purge Methods 0.000 description 10
- 239000006227 byproduct Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
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- 229910052751 metal Inorganic materials 0.000 description 5
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- 238000005755 formation reaction Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- DDMOUSALMHHKOS-UHFFFAOYSA-N 1,2-dichloro-1,1,2,2-tetrafluoroethane Chemical compound FC(F)(Cl)C(F)(F)Cl DDMOUSALMHHKOS-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
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- 239000010703 silicon Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- 239000004332 silver Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Images
Classifications
-
- 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
- C23C16/4412—Details relating to the exhausts, e.g. pumps, filters, scrubbers, particle traps
-
- 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
- C23C16/06—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 deposition of metallic material
- C23C16/18—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 deposition of metallic material from metallo-organic compounds
-
- 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
- C23C16/4401—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber
- C23C16/4405—Cleaning of reactor or parts inside the reactor by using reactive gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/30—Capture or disposal of greenhouse gases of perfluorocarbons [PFC], hydrofluorocarbons [HFC] or sulfur hexafluoride [SF6]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a film forming apparatus, an exhaust system, and a trap mechanism used for forming a film on a target object such as a semiconductor wafer using a source gas.
- a process of forming a thin film on the surface of a semiconductor wafer, an LCD substrate or the like and a process of etching the thin film into a desired pattern are repeatedly performed.
- a predetermined processing gas (raw material gas) is reacted in a processing container to thereby form a silicon thin film, a silicon oxide or nitride thin film, or a metal thin film, A thin film of metal oxide or nitride is formed on the surface of the object to be processed.
- a predetermined processing gas raw material gas
- a processing container to thereby form a silicon thin film, a silicon oxide or nitride thin film, or a metal thin film
- a thin film of metal oxide or nitride is formed on the surface of the object to be processed.
- an extra reaction by-product is generated and discharged together with the exhaust gas, or an unreacted processing gas is discharged together with the exhaust gas.
- ⁇ Reaction by-products and unreacted processing gas in the exhaust gas will cause environmental pollution if released into the atmosphere as they are.
- a trap mechanism is generally provided in the exhaust system extending from the processing vessel, thereby capturing reaction by-products and unreacted processing gas contained in the exhaust gas. To be removed.
- the trap mechanism When removing reaction by-products that condense (liquefy) or solidify (solidify) at room temperature, the trap mechanism is configured, for example, by providing a large number of fins in a housing having an exhaust gas inlet and an exhaust port. Has been. The fins are sequentially arranged in the direction in which the exhaust gas flows. When the exhaust gas passes between the fins, reaction byproducts in the exhaust gas adhere to the fin surface and are captured. In order to increase the capture efficiency, the fins are also cooled by a cooling medium or the like (see, for example, Japanese Patent Application Laid-Open Nos. 08-083773 and 08-172083).
- a thin film containing a noble metal such as silver, gold, or ruthenium is formed with a film forming apparatus using a raw material (source gas) such as an organometallic compound containing the noble metal. Things are also done.
- the exhaust gas is cooled and the gas is condensed to recover by-products containing unreacted raw materials, and it is also proposed to recover unreacted raw materials by purifying the by-products. (See JP 2001-342566 A).
- the trap mechanism as described above has a problem in that it is difficult to efficiently cool a gas having a low vapor pressure and is relatively difficult to liquefy to a temperature at which the gas can be collected, and the collection efficiency is low.
- the present invention can efficiently collect the collection target object by efficiently cooling and liquefying the collection target gas by changing the exhaust conductance and adiabatic expansion while cooling the exhaust gas.
- a trap mechanism, an exhaust system, and a film forming apparatus are provided.
- a trap mechanism for recovering a target gas by cooling and liquefying a housing having a gas inlet and a gas outlet, a partition member that divides the housing into a plurality of staying spaces, and the staying spaces communicate with each other.
- a trap mechanism including a communication path and a cooling jacket portion for cooling the communication path to cool the exhaust gas is provided.
- exhaust gas can be adiabatically expanded by changing the exhaust conductance while cooling the exhaust gas by sequentially flowing the exhaust gas through the communication passages. It becomes possible to efficiently cool and liquefy the gas to efficiently collect the collection target.
- an exhaust passage connected to an exhaust port of the film forming apparatus main body;
- a vacuum pump interposed in the middle of the exhaust passage, the trap mechanism interposed in the middle of the exhaust passage upstream of the vacuum pump, and the exhaust passage so as to bypass the trap mechanism
- An exhaust system comprising an inert gas supply means for supplying an inert gas higher than the pressure of the exhaust gas when exhaust gas flows through the bypass passage is provided in the exhaust passage between the first and second exhaust passages.
- the exhaust gas flowing in the bypass passage is supplied by supplying the inert gas having a pressure higher than that of the exhaust gas to the upstream side and the downstream side of the trap mechanism when the exhaust gas flows into the bypass passage. Even a slight amount of gas (for example, cleaning gas) can be prevented from flowing into the trap mechanism.
- the film forming apparatus main body having a processing container that can be evacuated, and the object to be processed are mounted.
- a mounting table structure for placing the gas, gas introducing means for introducing gas into the processing container, a gas supply system connected to the gas introducing means for supplying gas, and for exhausting the atmosphere in the processing container.
- a surname membrane device comprising the above-described exhaust system is provided.
- a raw material gas is generated by gasifying an organic metal compound that is liquid at room temperature such as Ru (EtCp) 2 , RuCpBuCp, RuCpPrCp, Ru (nbd) (iHD) 2 as a raw material.
- an organic metal compound that is liquid at room temperature
- Ru (EtCp) 2 , RuCpBuCp, RuCpPrCp, Ru (nbd) (iHD) 2 as a raw material.
- a film forming apparatus 2 includes a film forming apparatus main body 4 that performs a film forming process on a disk-shaped semiconductor wafer W as an object to be processed, and a film forming apparatus main body 4.
- a gas supply system 6 for supplying necessary gas including a raw material gas for film
- an exhaust system 8 for exhausting exhaust gas from the film forming apparatus body 4
- a trap mechanism 10 provided in the exhaust system 8. It is configured.
- the film forming apparatus main body 4 has a cylindrical processing container 12 made of, for example, an aluminum alloy.
- a mounting table structure 14 is provided for mounting and holding a semiconductor wafer W, which is an object to be processed.
- the entire mounting table structure 14 is formed in a disk shape, for example, and the semiconductor wafer W is mounted on the upper surface side.
- the mounting table structure 14 is attached and fixed to an upper end portion of a metal support column 16 made of, for example, an aluminum alloy that stands up from the bottom portion of the processing container 12.
- a heating heater 18 made of, for example, a tungsten wire heater or a carbon wire heater is embedded in the mounting table structure 14 as a heating means on the upper side thereof to heat the semiconductor wafer W.
- a refrigerant passage 20 for flowing a refrigerant that cools the lower part and the side part of the mounting table structure 14 to adjust the temperature.
- the mounting table structure 14 is provided with a lifter pin (not shown) that is moved up and down when the semiconductor wafer W is carried in and out and transfers the semiconductor wafer W to and from the transfer arm.
- An exhaust port 22 is provided at the bottom of the processing vessel 12, and the exhaust system 8 is connected to the exhaust port 22 so that the atmosphere in the processing vessel 12 can be evacuated.
- the exhaust system 8 will be described later.
- An opening 24 for loading and unloading the semiconductor wafer W is formed in the side wall of the processing container 12, and a gate valve 25 for opening and closing the opening is provided in the opening 24.
- a gas introducing means 30 comprising, for example, a shower head 26 is provided on the ceiling portion of the processing container 12, and a necessary gas is supplied into the processing container 12 from a gas ejection hole 31 provided on the lower surface. Yes.
- Heaters 32 and 34 are provided on the side wall of the processing vessel 12 and the shower head 26, respectively, and by keeping these at a predetermined temperature, the raw material gas is prevented from being liquefied.
- the gas supply system 6 is connected to the gas inlet 26 ⁇ / b> A of the shower head 26.
- FIG. 1 shows only the gas supply system for supplying the raw material.
- the purge gas supply system is connected to the processing vessel 12, and if there is another necessary gas, the gas supply is supplied.
- the system is connected to the processing vessel 12.
- the shower head 26 may be a premix type in which the raw material gas and other gas are mixed in the shower head 26, or the shower head 26 may be divided into the raw material gas and the other gas.
- a post-mix type gas is used in which gases are separately introduced into the processing container 12 and then mixed.
- the shower head 26 is used as the gas introduction means 30, but a nozzle may be used instead, and the gas introduction form is not particularly limited.
- the gas supply system 6 has a raw material tank 36 for storing a solid raw material or a liquid raw material.
- a liquid raw material 38 which is a raw material of the organometallic compound is stored in the raw material tank 36.
- Ru (EtCp) 2 , RuCpBuCp, RuCpPrCp, Ru (Nbd) (iHD) 2 or the like is used as the liquid raw material 38.
- the liquid material 38 generally has a characteristic that vapor pressure is very low and it is difficult to evaporate.
- the raw material tank is connected via a raw material passage 42 having one end connected to a gas outlet 40 provided on the ceiling of the raw material tank 36 and the other end connected to a gas inlet 26A of the shower head 26 of the film forming apparatus body 4.
- the source gas generated at 36 can be supplied to the shower head 26.
- An opening / closing valve 44 is interposed in a portion of the raw material passage 42 close to the raw material tank 36.
- a carrier gas pipe 46 for supplying a carrier gas to the raw material tank 36 is connected to the ceiling portion of the raw material tank 36.
- a gas inlet 48 at the tip of the carrier gas pipe 46 is inserted into the raw material tank 36 and positioned in the upper space 50.
- a flow rate controller 52 such as a mass flow controller and a carrier gas on / off valve 54 are sequentially provided.
- the carrier gas is supplied while controlling the flow rate to heat the liquid raw material 38. By doing so, the liquid raw material 38 is vaporized to form a raw material gas.
- N 2 gas is used as the carrier gas.
- a rare gas such as Ar may be used as the carrier gas.
- the raw material tank 36 is provided with a tank heating means 56 for heating the raw material tank 36 to promote the vaporization of the liquid raw material 38.
- the heating temperature of the raw material tank 36 is a temperature equal to or lower than the decomposition temperature of the liquid raw material 38.
- the raw material passage 42 is provided with a passage heater 58 such as a tape heater to prevent the raw material gas from being reliquefied by heating the raw material passage 42 to a temperature higher than the liquefaction temperature of the raw material gas. Yes.
- the exhaust system 8 has an exhaust passage 60 connected to the exhaust port 22 of the processing container 12, and the atmosphere in the processing container 12 is exhausted along the exhaust passage 60.
- the pressure adjusting valve 62, the trap mechanism 10, the vacuum pump 64, and the detoxifying device 66 are sequentially provided in the exhaust passage 60 from the upstream side to the downstream side.
- manually operated on-off valves 68 are provided for sealing the exhaust passage 60 side when the trap mechanism 10 is removed from the exhaust passage 60.
- the pressure adjusting valve 62 is composed of a butterfly valve, for example, and has a function of adjusting the pressure in the processing container 12.
- the vacuum pump 64 is composed of, for example, a dry pump, and can evacuate the atmosphere in the processing container 12.
- a passage heater 70 such as a tape heater is provided in the exhaust passage 60 from the exhaust port 22 of the processing container 12 to the trap mechanism 10 and each member interposed in the middle thereof, and the exhaust gas is supplied to the predetermined passage. Heating to a temperature prevents the gas to be collected in the exhaust gas from liquefying on the way.
- the trap mechanism 10 is for re-liquefying and recovering unreacted source gas from the exhaust gas.
- the trap mechanism 10 includes a casing 72 that forms the entire outer shell, a partition member 76 that partitions the interior of the casing 72 into a plurality of staying spaces 74, and the plurality of the above-described plurality of trap mechanisms.
- a communication passage 78 communicating with the remaining spaces 74 and a cooling jacket portion 80 for cooling the communication passage 78 in order to cool the exhaust gas.
- the plurality of staying spaces 74 are constituted by three stays of the first staying space 74A, the second staying space 74B, and the third staying space 74C, and the staying spaces 74A to 74C are communicated in the above order. 78 in series.
- the cooling jacket portion 80 includes a first cooling jacket 80A provided in the upper part of the housing 72 and a second cooling jacket 80B provided in the central portion of the housing 72.
- the second cooling jackets 80A and 80B are both made of stainless steel, for example.
- the casing 72 is formed into a cylindrical shape using, for example, stainless steel.
- a gas inlet 72A is formed at the center of the ceiling portion of the casing 72, and the upstream side of the exhaust passage 60 is connected to the gas inlet 72A.
- a gas outlet 72B is formed at the center of the bottom of the casing 72, and the downstream side of the exhaust passage 60 is connected to the gas outlet 72B.
- the gas inlet 72A and the gas outlet 72B are each provided with an on-off valve (not shown) that is manually operated to completely seal the inside of the casing 72 when the trap mechanism 10 is removed from the exhaust passage 60. Yes.
- the size of the casing 72 is, for example, about 20 to 40 cm in diameter and about 20 to 50 cm in height, but these numerical values are not particularly limited.
- the first cooling jacket 80A also serves as a partition member 76 that partitions the first stay space 74A and the second stay space 74B. As described above, the first cooling jacket 80A is provided horizontally across the entire width direction of the casing 72 at the upper portion in the casing 72, and the first staying space 74A is partitioned above the first cooling jacket 80A. The second staying space 74B is partitioned.
- the first cooling jacket 80A is partitioned by an upward convex bottom partition wall 82 and a flat ceiling partition wall 92.
- a refrigerant inlet 88 is provided at the lower part of the first cooling jacket 80A, and a refrigerant outlet 90 is provided at the upper part so that the refrigerant 86 flows inside.
- the ceiling partition wall 92 is provided so as to face the gas inlet 72A of the casing 72.
- the gas inlet 72A extends from the gas inlet 72A to the ceiling partition wall 92 to form a cylindrical gas.
- An introduction tube 94 is provided.
- the leading end of the gas introducing cylinder 94 is close to the ceiling partition wall 92, and thereby a communication gap 96, which is a small ring-shaped interval, is provided between the leading end of the gas introducing cylinder 94 and the ceiling partition wall 92. Is formed. Therefore, the introduction space 98 that is the space in the gas introduction cylinder 94 and the first staying space 74 ⁇ / b> A that is the outer peripheral side space communicate with each other via the communication gap 96. In other words, the effective opening area of the passage leading from the introduction space 98 to the first staying space 74A, that is, the opening area of the communication gap 96 is small, and therefore the exhaust conductance is small and pressure loss occurs.
- the exhaust gas passing through the communication gap 96 is adiabatically expanded in the first staying space 74 ⁇ / b> A while being cooled by the ceiling partition wall 92.
- the inner diameter of the exhaust passage 60 (gas introduction cylinder 94) is, for example, about 40 to 60 mm
- the interval L1 of the communication gap 96 is, for example, in the range of about 2 to 10 mm.
- the first cooling jacket 80A is provided with a first communication path 78A as a communication path 78 that connects the first retention space 74A and the second retention space 74B.
- the first communication passage 78A is provided so as to penetrate the first cooling jacket 80A in the vertical direction.
- a plurality of first communication paths 78A are arranged at equal intervals along the circumferential direction.
- eight first communication passages 78A are arranged, but this number is not particularly limited. For example, although it depends on the inner diameter of the first communication passage 78A, it is in the range of about 4-20. .
- the first communication passage 78A is made of metal, for example, stainless steel.
- the first communication passage 78A extends linearly downward, it may be bent in a curved shape, for example, a meandering shape or a sine curve shape in order to adjust the exhaust duct.
- the inner diameter of the first communication path 78A is, for example, about 2 to 10 mm.
- the first communication passage 78A is sufficiently cooled by the first cooling jacket 80A, so that the exhaust gas passing therethrough can be sufficiently cooled. Therefore, the effective opening area of the passage from the first staying space 74A to the second staying space 74B, that is, the total flow passage cross section of the first communication passage 78A is small, so that the exhaust conductance is small and the pressure loss is generated. Therefore, the exhaust gas passing through the first communication passage 78A is adiabatically expanded in the second residence space 74B while being cooled.
- the second cooling jacket 80B is provided in the second stay space 74B.
- the second cooling jacket 80B is formed with a second communication passage 78B that communicates the second staying space 74B and the third staying space 74C. That is, the second cooling jacket 80B serves as the partition member. Also serves as 76.
- the second cooling jacket 80B includes a cylindrical jacket body 106 composed of two jacket cylinders 102 and 104 disposed concentrically with a cooling space 100 having a predetermined width therebetween, On the outer periphery of the jacket main body 106, an outer cylinder 108 with a ceiling is disposed concentrically with a predetermined gap serving as the second communication path 78B from the outer periphery.
- the third stay space 74C is formed by the inner space 110 of the cylindrical jacket body 106 and the upper space 112 of the outer cylinder 108.
- the jacket cylinders 102 and 104 and the outer cylinder 108 are each made of stainless steel and are formed into a cylindrical shape.
- the upper end portions and the lower end portions of the jacket cylinders 102 and 104 are connected and sealed to form the cooling space portion 100 in which the inside is formed into an annular shape, and the coolant 114 flows inside.
- An inner jacket cylinder 104 of the jacket body 106 extends longer than the outer jacket cylinder 102 and is fixed to the bottom of the casing 72 with a bracket 104A.
- the lower end portion of the outer cylinder 108 is also fixed to the bottom portion of the housing 72 with a bracket 108A.
- a refrigerant introduction nozzle 116 for introducing a refrigerant into the jacket body 106 and a refrigerant discharge nozzle 118 for discharging the refrigerant to the outside.
- the tip of the refrigerant introduction nozzle 116 is positioned at the lower end portion in the jacket main body 106, and the tip of the refrigerant discharge nozzle 118 is positioned at the upper end portion in the jacket main body 106, and the refrigerant 114 is placed in the jacket main body 106. It can be discharged when it is full.
- the refrigerant 114 discharged from the refrigerant discharge nozzle 118 may be led to the refrigerant inlet 88 of the first cooling jacket 80A through a flow path (not shown) to circulate and use the refrigerant.
- the outer cylinder 108 with a ceiling is concentrically arranged on the outer periphery of the jacket main body 106 with a predetermined gap therebetween, so that the outer periphery of the jacket main body 106 and the inner periphery of the outer cylindrical body 108 are arranged.
- An annular second communication passage 78B having a small channel cross-sectional area is formed therebetween.
- the width L2 of the second communication path 78B is, for example, about 1 to 5 mm.
- a plurality of communication holes 120 that connect the second staying space 74B and the second communication passage 78B are formed on the side surface of the outer cylinder 108.
- the communication hole 120 is formed on the side surface of the outer cylinder 108, the outer peripheral surface of the jacket body 106 exists in the flow direction of the exhaust gas flowing in from the communication hole 120. It can collide with the outer peripheral surface of the jacket main body 106.
- the communication hole 120 forms three groups respectively located at the middle, lower, and lowermost ends in the height direction of the outer cylinder 108. That is, the communication holes 120 are grouped into a middle communication hole 120A, a lower communication hole 120B, and a lowermost communication hole 120C.
- each of the communication holes 120A, 120B, and 120C at the middle, lower, and lowermost ends are provided at equal intervals along the circumferential direction of the outer cylindrical body 108. Accordingly, the exhaust gas flowing into the second communication passage 78B from the second retention space 74B through the communication holes 120A to 120C flows upward in the second communication passage 78B and flows into the third residence space. It will be guided into the space 74C.
- the diameter of each of the communication holes 120A to 120C is, for example, about 2 to 5 mm, but is not particularly limited.
- the effective opening area of the passage from the second staying space 74B to the third staying space 74C that is, the total cross-sectional area of the flow path is small, so that the exhaust conductance becomes small and pressure loss occurs.
- the exhaust gas passing through the second communication passage 78B is adiabatically expanded in the third staying space 74C while being cooled. Since the groups of communication holes 120 having different height positions of the outer cylinder 108 are provided, the second communication passage 78B increases as the amount of the stored liquid 140 in the housing 72 increases and the liquid level rises. The exhaust conductance decreases gradually. For this reason, the exhaust conductance of the trap mechanism 10 also decreases stepwise.
- the stepwise change in the exhaust conductance affects the opening degree of the pressure regulating valve 62 and the pressure value in the processing container 12 in a stepwise manner.
- the stored liquid 140 in the casing 72 is monitored.
- the amount of can be detected indirectly. Thereby, the necessity for replacement
- the liquid which lets the inside of the 3rd stay space 74C and the inside of the 2nd stay space 74B communicate with each other in the bottom end part of the jacket cylinder 104 inside the jacket body 106 passes the collected liquid.
- the liquid flow hole 122 is formed, the liquid flow hole 122 is filled with the stored liquid 140 immediately after the liquid level of the collected stored liquid rises slightly, and the second and third The movement of the exhaust gas between the remaining spaces 74B and 74C is blocked. Further, although the amount of stored liquid is reduced, the liquid circulation hole 122 may not be provided.
- a gas discharge path 124 extending in the vertical direction is provided in the third staying space 74C.
- the gas discharge path 124 is formed of, for example, stainless steel.
- a gas inlet 124A at the upper end of the gas exhaust path 124 is positioned at the upper portion in the third staying space 74C, and the gas exhaust path 124 passes through the bottom of the casing 72, and the gas exhaust at the lower end of the gas exhaust path 124.
- the outlet 124B is located in the gas outlet 72B provided on the lower outer side of the casing 72, whereby the exhaust gas in the third staying space 74C is discharged out of the casing 72. Yes.
- the gas exhaust passage 124 is spirally wound and lengthened to increase the passage length, but it may be formed in a straight line.
- the inner diameter of the gas discharge path 124 is, for example, about 2 to 10 mm.
- a discharge nozzle 130 provided with an opening / closing valve 128 is provided at the bottom of the casing 72 to discharge the collected stored liquid to the outside of the casing 72.
- the overall operation of the film forming apparatus 2 configured as described above, for example, control of start and stop of gas supply, process temperature, process pressure, supply of refrigerant in the trap mechanism 10, circulation of refrigerant, and the like is performed by, for example, a computer. This is performed by the device control unit 132 (see FIG. 1).
- a computer-readable program necessary for this control is stored in a storage medium 134.
- a storage medium 134 a flexible disk, a CD (Compact Disc), a CD-ROM, a hard disk, a flash memory, a DVD, or the like is used. be able to.
- FIG. 5 is a cross-sectional view showing a state where the stored liquid is stored in the trap mechanism.
- the vacuum pump 64 of the exhaust system 8 is continuously driven to evacuate the processing container 12 to a predetermined pressure.
- the semiconductor wafer W supported by the mounting table structure 14 is maintained at a predetermined temperature by the heater 18.
- the side walls of the processing vessel 12 and the shower head 26 are also maintained at predetermined temperatures by heaters 32 and 34, respectively. This temperature is a temperature range higher than the liquefaction temperature of the raw material gas.
- the entire gas supply system 6 is heated in advance to a predetermined temperature by the tank heating means 56 and the passage heater 58.
- the carrier gas whose flow rate is controlled is supplied into the raw material tank 36 via the carrier gas pipe 46, whereby the upper space portion 50 in the raw material tank 36.
- the raw material gas that is vaporized and saturated flows together with the carrier gas in the raw material passage 42 toward the downstream side.
- This source gas is introduced from the shower head 26 of the film forming apparatus body 4 into the processing container 12 in a reduced pressure atmosphere, and the Ru metal is deposited on the semiconductor wafer W by, for example, CVD (Chemical Vapor Deposition).
- CVD Chemical Vapor Deposition
- the thin film is formed.
- the process condition at this time is that the process pressure is about 50 Torr (6665 Pa).
- the unreacted liquid raw material 38 flows down in the exhaust passage 60 of the exhaust system 8 together with the carrier gas in the processing container 12.
- the exhaust passage 60 is also heated by the passage heater 70 to prevent the source gas from being liquefied again and maintain the gas state.
- the exhaust gas flowing down the exhaust passage 60 passes through the pressure regulating valve 62, the trap mechanism 10, the vacuum pump 64, and the abatement device 66 in order, and then is diffused into the atmosphere.
- cooling water is flowed as a refrigerant to be cooled.
- This refrigerant is not limited to cooling water, and any refrigerant may be used.
- the exhaust gas flowing in the exhaust passage 60 is taken into the housing 72 from a gas inlet 72A provided at the upper portion of the housing 72, and this exhaust gas is introduced into the gas introduction cylinder 94 from the introduction space 98 immediately below the gas inlet 72A. And diffused into the first staying space 74A through a narrow annular communication gap 96 formed between the first cooling jacket 80A and the ceiling partition wall 92 of the first cooling jacket 80A. At this time, the exhaust gas flowing through the communication gap 96 efficiently contacts or collides with the ceiling partition wall 92, is sufficiently cooled, and further adiabatically expands when flowing into the first staying space 74A. Since the temperature of the gas decreases, a part of the source gas contained in the exhaust gas is liquefied.
- the exhaust gas in the first staying space 74A enters the first communication passage 78A formed in a plurality in the first cooling jacket 80A and flows downward while being cooled therein. It flows into the second staying space 74B.
- the exhaust gas flowing in the first communication passage 78A is efficiently cooled by contacting with the wall surface of the first communication passage 78A cooled here, and further flows into the second retention space 74B.
- the temperature of the exhaust gas is lowered due to adiabatic expansion, a part of the raw material gas is liquefied.
- the exhaust gas in the second staying space 74B is narrowly formed in the second communication passage formed annularly from each communication hole 120 formed in the outer cylinder 108 of the second cooling jacket 80B. It enters the 78B, flows upward while flowing in this, and flows into the third staying space 74C.
- the exhaust gas in the third staying space 74C flows into the gas discharge path 124 from the gas suction port 124A located in the upper part of the third staying space 74C, and flows downward in this. Then, the gas is discharged from the gas outlet 124B into the gas outlet 72B. At this time, the exhaust gas is adiabatically expanded. This exhaust gas further flows downstream of the exhaust passage 60.
- the raw material liquefied by cooling in the first to third residence spaces 74A, 74B, and 74C flows down along the wall surfaces that define the first and second communication passages 78A and 78B, and reaches the bottom of the casing 72.
- the stored liquid 140 (see FIG. 5) is stored little by little, and the liquid level of the stored liquid 140 rises little by little.
- the second staying space 74B and the third staying space 74C include a lowermost communication hole 120C provided at the lower end of the outer cylinder 108 and a liquid circulation hole 122 provided at the lower end of the inner jacket cylinder 104. Therefore, the stored liquid 140 is stored in the staying spaces 74B and 74C while flowing between the staying spaces 74B and 74C, and the liquid level of the stored liquid 140 in the staying spaces 74B and 74C is , Rising while maintaining the same height level.
- the second staying space 74B and the third staying space 74C flow through the lowermost end communication hole 120C and the jacket cylinder 104 as described above. Since the communication is made through the hole 122, a part of the exhaust gas in the second retention space 74B flows into the third retention space 74C without passing through the second communication passage 78B. However, the second staying space 74B and the third staying space 74C are completely separated by storing the stored liquid 140 in such a small amount that it can block the liquid circulation hole 122. In particular, no problems arise.
- the amount of the stored liquid 140 in the casing 72 is increased, and the liquid level is positioned at the uppermost position in the communication hole 120 formed in the outer cylindrical body 108 as indicated by a one-dot chain line 142 in FIG.
- the exhaust gas stops flowing and the collection stops.
- the gas suction port 124A at the upper end portion of the gas discharge path 124 is positioned above the middle communication hole 120A located at the uppermost position of the communication holes 120 formed in the outer cylindrical body 108. Does not flow downstream of the exhaust gas flow.
- pressure loss is generated by providing portions where the exhaust conductance is reduced in a plurality of stages, such as the communication gap 96, the first communication passage 78A, and the second communication passage 78B.
- the exhaust gas is efficiently cooled by bringing the exhaust gas into contact with the cooled wall surface in a plurality of stages, for example, in three stages, and the exhaust gas is adiabatically expanded in each stage to obtain the raw material gas to be collected. Since the liquid is liquefied, the raw material can be efficiently recovered.
- the path length (gap width) and the path are set such that a pressure loss of 10 Torr (1333 Pa) or more occurs. It is preferable to adjust the exhaust conductance by changing the number.
- the gas to be collected contained in the exhaust gas is divided into the casing 72 having a gas inlet and a gas outlet, and the partition member 76 that partitions the casing into a plurality of staying spaces 74A to 74C.
- a communication path 78 (78A, 78C) that connects the staying spaces and a cooling jacket portion 80 that cools the communication path to cool the exhaust gas are provided, and the exhaust gas is sequentially flowed to each staying space through the communication path.
- the gas inlet tube 94 is provided at the gas inlet 72A, but may be omitted without providing it. Further, in the above embodiment, the first cooling jacket 80A and the second cooling jacket 80B are provided. However, as shown in FIG. 8, the first cooling jacket 80A (including the first communication passage 78A) is provided. Instead, the first staying space 74A and the second staying space 74B may be integrated into a single staying space 74AB.
- the refrigerant may be supplied only to the first cooling jacket 80A, and the refrigerant may not be supplied to the second cooling jacket 80B.
- the raw material gas is collected as the collection target gas and the unreacted raw material is collected.
- the collection target is not limited to this, and the liquid raw material or the liquid reaction is not limited to this. By-products can be collected.
- the cleaning gas reacts very easily with the gas to be collected and the object to be collected in the trap mechanism 10, so that even a small amount of the cleaning gas must be prevented from entering the trap mechanism 10. .
- the above-described on-off valve there is a possibility that leakage may occur although it is actually very small. Therefore, there is a fear that a slight cleaning gas leaking from the on-off valve diffuses little by little and enters the trap mechanism 10.
- the exhaust system here is configured to reliably prevent the cleaning gas from entering the trap mechanism 10 even if the cleaning gas leaks slightly from the on-off valve.
- FIG. 6 is a schematic configuration diagram showing the entire film forming apparatus having such an exhaust system
- FIG. 7 is an explanatory diagram for explaining the flow of gas flowing in the exhaust system.
- the film forming apparatus shown in FIG. 6 is formed in exactly the same manner as the film forming apparatus shown in FIG. 1 except for the exhaust system 8, but is shown here in a simplified manner, and the components shown in FIG. The same components are given the same reference numerals.
- a purge gas supply system 150 that supplies a purge gas and a cleaning gas supply system that supplies a cleaning gas. 152, and on-off valves 154 and 156 are interposed in the respective gas passages.
- purge gas for example, N 2 gas is used.
- the purge gas is not limited to this, and a rare gas such as Ar may be used.
- the cleaning gas for example, ClF 3 gas is used.
- a bypass passage 158 is first connected to the exhaust passage 60 so as to bypass the trap mechanism 10.
- the bypass passage 158 is connected to the exhaust passage 60 on the upstream side and the downstream side of the trap mechanism 10.
- a switching valve mechanism 162 for switching the flow of exhaust gas between the exhaust passage 60 side and the bypass passage 158 side is provided at the connection portion 160 on the upstream side of the bypass passage 158.
- the switching valve mechanism 162 includes a first on-off valve 164 provided in the exhaust passage 60 on the downstream side of the connecting portion 160 and a second on-off valve 166 provided in the bypass passage 158. By switching the opening / closing state of 166, the flow of the exhaust gas is switched as described above.
- a three-way valve may be provided in place of the first and second on-off valves 164 and 166.
- an inflow prevention on-off valve 170 for preventing the backflow of the cleaning gas is provided in the middle of the exhaust passage 60 on the upstream side of the connection portion 168 on the downstream side of the bypass passage 158. Then, in the exhaust passage 60 between the gas inlet 72A of the trap mechanism 10 and the connection portion 160 upstream of the bypass passage 158, and between the gas outlet 72B of the trap mechanism 10 and the connection portion 168 downstream of the bypass passage 158.
- An inert gas supply means 172 for supplying an inert gas having a pressure higher than the pressure of the exhaust gas when exhaust gas flows through the bypass passage 158 is provided in the exhaust passage 60 therebetween.
- the inert gas supply means 172 is connected to the exhaust passage 60 between the gas inlet 72A and the upstream connecting portion 160 and downstream of the first on-off valve 164.
- the first pressurizing gas passage 174 and the second pressurizing gas connected between the gas outlet 72B and the downstream connecting portion 168 and connected to the exhaust passage 60 upstream of the inflow prevention on-off valve 170.
- a passage 176 and an inert gas supply unit 178 for supplying an inert gas into the first and second pressurizing gas passages 174 and 176 are provided.
- first pressurizing gas passage 174 In the middle of the first pressurizing gas passage 174, there is provided a gas supply opening / closing valve 180 which is opened when an inert gas is supplied and is closed at other times.
- first and second pressurizing gas passages 174 and 176 communicate with each other and are provided as one common gas passage 182.
- the inert gas supply unit 178 is connected to the common gas passage 182 and shared.
- An open / close valve 186 is provided in the gas supply passage 184 of the inert gas supply unit 178 so that an inert gas can be supplied as necessary.
- N 2 gas is used as the inert gas, but a rare gas such as Ar may be used instead.
- the pressure in the exhaust passage 60 varies depending on the processing mode, for example, the maximum is about 400 Torr (53338.9 Pa), whereas the pressure of the inert gas is set high to about 500 Torr (666661.2 Pa). ing.
- first pressurization gas passage 174 in the exhaust passage 60 downstream of the connection portion 188 to the exhaust passage 60 and the second pressurization gas passage 176 in the upstream of the connection portion 190 to the exhaust passage 60 are provided on the way of the exhaust passage 60.
- open / close valves 192 and 194 for preventing backflow are provided on the way of the exhaust passage 60.
- the common gas passage 182 that is, the first and second pressurization gas passages 174 and 176
- the common gas passage 182 have a pressure higher than the exhaust gas, for example, 500 Torr (666661.2 Pa).
- An inert gas having a high pressure is introduced and sealed between the valve 194 and the on-off valve 170 for preventing inflow, so that even a slight amount of cleaning gas does not flow in or diffuse.
- a pressure gauge 196 is provided in the common gas passage 182 so that the presence or absence of a leak of the inert gas can be confirmed by monitoring the pressure fluctuation in the common gas passage 182.
- the opening / closing control of each opening / closing valve is performed by an instruction from the device control unit 132, for example.
- FIG. 7A shows the flow of exhaust gas during film formation
- FIG. 7B shows the flow of exhaust gas during cleaning.
- FIG. 7 when the figure of each on-off valve is white, it indicates “open state”, and when it is black, it indicates “closed state”.
- exhaust gas is allowed to flow through the trap mechanism 10 and is not allowed to flow through the bypass passage 158.
- the inert gas supply means 172 is not operated. That is, the second on-off valve 166 of the switching valve mechanism 162, the gas supply on-off valve 180 of the first pressurizing gas passage 174, and the on-off valve 186 of the inert gas supply unit 178 are closed.
- the first on-off valve 164 of the switching valve mechanism 162, the on-off valves 192 and 194 for preventing backflow on the upstream and downstream sides of the trap mechanism 10 and the on-off valve 170 for preventing inflow are both opened.
- the exhaust gas during film formation flows along the exhaust passage 60 and flows into the trap mechanism 10, and is collected from the exhaust gas in the trap mechanism 10 as described above.
- the target gas is cooled and the collection target is removed.
- the exhaust gas flowing out from the trap mechanism 10 flows downstream as it is.
- the first on-off valve 164 of the switching valve mechanism 162, the on-off valves 192 and 194 for preventing backflow on the upstream and downstream sides of the trap mechanism 10 and the on-off valve 170 for preventing inflow are closed.
- the exhaust gas including the cleaning gas at the time of the cleaning process flows along the bypass passage 158 from the exhaust passage 60 and does not flow into the trap mechanism 10 as indicated by the arrow 202.
- the inert gas supply unit 178 supplies N 2 gas having a pressure higher than that of the exhaust gas containing the cleaning gas, as indicated by an arrow 204, and the N 2 gas is supplied to the first and second gases.
- the pressure gas passages 174 and 176, that is, the common gas passage 182 are introduced into the exhaust passage 60 side.
- An inert gas is introduced into the portion of the exhaust passage 60 between the valve 194 and the on-off prevention on-off valve 170 and is sealed in a state where the pressure is higher than that of the exhaust gas containing the cleaning gas.
- the N 2 gas supplied from the inert gas supply unit 178 flows into the exhaust gas side having a low pressure. .
- the pressure of the N 2 gas is, for example, 500 Torr (666661.2 Pa), while the pressure of the exhaust gas including the cleaning gas is about 50 to 400 Torr (6666612 to 53328.9 Pa).
- the exhaust gas is caused to flow through the bypass passage 158 not only during the cleaning process but also when the wafer W is carried into and out of the processing container 12, for example, because the purge gas is supplied into the processing container 12.
- the bypass passage 158 may also be used when exhausting the purge gas.
- the inert gas of 500 Torr (666661.2 Pa) is supplied to the common gas passage 182
- the pressure of the inert gas supplied to the common gas passage 182 is higher than the pressure of the exhaust gas flowing through the bypass passage 158. What is necessary is just high, and it is not limited to said 500 Torr (666661.2 Pa).
- the common gas passage 182 that communicates the first and second pressurization gas passages 174 and 176 is used, and one inert gas supply unit 178 is connected to the common gas passage 182.
- the second pressurizing gas passages 174 and 176 may be provided separately and independently, and the inert gas supply unit may be provided in each of them.
- the present invention is not limited to this, and other chlorine-based gas, fluorine-based gas such as NF 3 gas, or ozone may be used. Further, here, the gas supply on / off valve 180 and the backflow prevention on / off valve 192 are provided separately, but these may be integrated to use a three-way valve.
- the object to be processed is a semiconductor wafer.
- this semiconductor wafer includes a silicon substrate and a compound semiconductor substrate such as GaAs, SiC, or GaN.
- the object to be processed may be a glass substrate or a ceramic substrate used for a liquid crystal display device.
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Abstract
Description
次に、以上のように構成された成膜装置2を用いて行われる成膜方法とトラップ機構の動作について図5も参照して説明する。図5はトラップ機構に貯留液が貯って行く状態を示す断面図である。まず、図1に示すように、この成膜装置2の成膜装置本体4においては、排気系8の真空ポンプ64が継続的に駆動されて、処理容器12内が真空引きされて所定の圧力に維持されており、また載置台構造14に支持された半導体ウエハWは加熱ヒータ18により所定の温度に維持されている。また処理容器12の側壁及びシャワーヘッド26もそれぞれヒータ32、34により所定の温度に維持されている。この温度は原料ガスの液化温度以上の温度範囲である。
次に、排気系の具体的な構成について説明する。実際には、上記処理容器内へはクリーニングガスやパージガス等が必要に応じて導入される。そのため、排気系には、クリーニング時にクリーニングガスをトラップ機構10内を通すことなく迂回して流すためのバイパス通路が設けられており、ガスの流路を開閉弁の操作によって切り替えるようになっている。
Claims (23)
- 被処理体の表面に薄膜を形成する成膜装置本体から排出される排気ガスを流す排気通路の途中に介設されて前記排気ガス中に含まれる捕集対象ガスを冷却して液化することにより回収するトラップ機構において、
ガス入口とガス出口とを有する筐体と、
前記筐体内を複数の滞留空間に区画する区画部材と、
前記滞留空間同士を連通する連通路と、
前記排気ガスを冷却するために前記連通路を冷却する冷却ジャケット部と、
を備えたことを特徴とするトラップ機構。 - 前記複数の滞留空間は、直列に接続された第1、第2及び第3の3つの滞留空間よりなることを特徴とする請求項1記載のトラップ機構。
- 前記冷却ジャケット部は、第1および第2の冷却ジャケットを有することを特徴とする、請求項2記載のトラップ機構。
- 前記第1の冷却ジャケットは、前記第1の滞留空間と前記第2の滞留空間とを連通する第1の連通路を内部に有すると共に、前記筐体内を上部の第1の滞留空間と下部の第2の滞留空間とに区画する前記区画部材を兼ねていることを特徴とする、請求項3記載のトラップ機構。
- 前記第1の冷却ジャケットの天井区画壁は、前記ガス入口に臨ませて設けられていることを特徴とする請求項4記載のトラップ機構。
- 前記ガス入口には、前記第1の冷却ジャケットの天井区画壁に対して延在されてその先端部が前記天井区画壁に接近して前記天井区画壁との間で前記第1の滞留空間に連通する連通隙間を形成するガス導入筒が設けられていることを特徴とする、請求項5記載のトラップ機構。
- 前記第1の連通路は屈曲されていることを特徴とする、請求項4記載のトラップ機構。
- 前記第1の連通路は複数設けられていることを特徴とする、請求項4記載のトラップ機構。
- 前記第2の冷却ジャケットは、前記第2の滞留空間内に設けられており、内部に前記第3の滞留空間を有すると共に外周に前記第2の滞留空間と前記第3の滞留空間とを連通する第2の連通路が形成されて前記区画部材を兼用することを特徴とする、請求項3記載のトラップ機構。
- 前記第2の冷却ジャケットは、所定の幅の冷却空間部を隔てて同心状に配置されて前記冷却空間部に冷媒を流すようにした2つのジャケット筒体を有する筒体状のジャケット本体と、前記ジャケット本体の外周に、この外周より前記第2の連通路となる所定の隙間を隔てて同心状に配置された有天井の外側筒体とを有し、前記筒体状のジャケット本体の内側空間と前記外側筒体内の上部空間とで前記第3の滞留空間を形成するようにしたことを特徴とする、請求項9記載のトラップ機構。
- 前記外側筒体の側面には、前記第2の滞留空間と前記第2の連通路とを連絡する複数の連絡孔が形成されていることを特徴とする、請求項10記載のトラップ機構。
- 前記第3の滞留空間には、上端部のガス吸入口が前記第3の滞留空間内の上部に位置され、下端部が前記ガス出口に連通されたガス排出路が設けられていることを特徴とする、請求項9記載のトラップ機構。
- 前記第1から第3の滞留空間内では、前記排気ガスの断熱膨張が行われるようになされていることを特徴とする、請求項3記載のトラップ機構。
- 被処理体の表面に薄膜を形成する成膜装置本体からの排気ガスを流す排気系において、
前記成膜装置本体の排気口に接続された排気通路と、
前記排気通路の途中に介設された真空ポンプと、
前記真空ポンプよりも上流側の前記排気通路の途中に介設された請求項1乃至13のいずれか一項に記載のトラップ機構と、
前記トラップ機構を迂回するように前記排気通路の途中に接続されたバイパス通路と、
前記トラップ機構のガス入口と前記バイパス通路の上流側の接続部との間の前記排気通路内と、前記トラップ機構のガス出口と前記バイパス通路の下流側の接続部との間の前記排気通路内とに、前記バイパス通路に排気ガスを流す時に前記排気ガスの圧力よりも高い不活性ガスを供給する不活性ガス供給手段と、
を備えたことを特徴とする排気系。 - 前記バイパス通路の上流側の接続部には、前記排気通路側と前記バイパス通路側との間で排気ガスの流れを切り替えるための切り替え弁機構が設けられていることを特徴とする、請求項14記載の排気系。
- 前記切り替え弁機構は、前記排気通路に設けられた第1の開閉弁と前記バイパス通路に設けられた第2の開閉弁とよりなることを特徴とする、請求項15記載の排気系。
- 前記バイパス通路の下流側の接続部よりも上流側の前記排気通路の途中には流入防止用の開閉弁が設けられていることを特徴とする、請求項14記載の排気系。
- 前記不活性ガス供給手段は、
前記ガス入口と前記上流側の接続部との間の前記排気通路に接続された第1の加圧用ガス通路と、
前記ガス出口と前記下流側の接続部との間の前記排気通路に接続された第2の加圧用ガス通路と、
前記第1及び第2の加圧用ガス通路に前記不活性ガスを供給する不活性ガス供給部と、
を有していることを特徴とする、請求項14記載の排気系。 - 前記第1の加圧用ガス通路の途中には、前記不活性ガスを供給する時に開状態になされ、それ以外の時には閉状態になされるガス供給用開閉弁が設けられていることを特徴とする、請求項18記載の排気系。
- 前記第1の加圧用ガス通路と前記第2の加圧用ガス通路とは連通されていることを特徴とする、請求項18記載の排気系。
- 前記第1の加圧用ガス通路の前記排気通路に対する接続部より下流側の排気通路の途中と、前記第1の加圧用ガス通路の前記排気通路に対する接続部より上流側の排気通路の途中とには、それぞれ逆流防止用の開閉弁が設けられていることを特徴とする、請求項18記載の排気系。
- 前記排気通路の途中には、圧力調整弁と除害装置とが設けられていることを特徴とする、請求項14記載の排気系。
- 被処理体の表面に薄膜を形成する成膜装置において、
真空排気が可能になされた処理容器を有する成膜装置本体と、
前記被処理体を載置するための載置台構造と、
前記処理容器内へガスを導入するガス導入手段と、
前記ガス導入手段に接続されてガスを供給するガス供給系と、
前記処理容器内の雰囲気を排気するために請求項14乃至22のいずれか一項に記載の排気系と、
を備えたことを特徴とする成膜装置。
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CN201380017359.3A CN104246007B (zh) | 2012-03-29 | 2013-03-28 | 捕集机构、排气系统和成膜装置 |
KR1020147026236A KR101684755B1 (ko) | 2012-03-29 | 2013-03-28 | 트랩 기구, 배기계 및 성막 장치 |
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KR20140138186A (ko) | 2014-12-03 |
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