WO1999028023A1 - Procede et appareil de recuperation de gaz rare - Google Patents
Procede et appareil de recuperation de gaz rare Download PDFInfo
- Publication number
- WO1999028023A1 WO1999028023A1 PCT/JP1998/005335 JP9805335W WO9928023A1 WO 1999028023 A1 WO1999028023 A1 WO 1999028023A1 JP 9805335 W JP9805335 W JP 9805335W WO 9928023 A1 WO9928023 A1 WO 9928023A1
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- Prior art keywords
- gas
- rare gas
- recovery
- exhaust
- rare
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/02—Feed or outlet devices therefor
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B23/00—Noble gases; Compounds thereof
- C01B23/001—Purification or separation processes of noble gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/18—Noble gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0216—Other waste gases from CVD treatment or semi-conductor manufacturing
-
- 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]
Definitions
- the present invention relates to a method and an apparatus for recovering a rare gas, and more particularly, to a rare gas using equipment operated under reduced pressure, such as a plasma sputtering apparatus, a plasma CVD apparatus, and a reactive ion etching apparatus.
- the present invention relates to a method and an apparatus for recovering gas.
- plasma is generated in a rare gas atmosphere under reduced pressure, and the plasma is used to perform various processes on the semiconductor device.
- a sputtering apparatus a plasma CVD apparatus, a reactive ion etching apparatus and the like are used.
- a rare gas is introduced into the process chamber at a flow rate of about 500 cc per minute while the chamber is evacuated by a vacuum pump, and the pressure in the chamber is maintained at about 1 Pa.
- a high-frequency is applied to the electrodes in the chamber to generate plasma, and the plasma is used to sputter a solid film-forming material placed in the chamber and deposit it on the wafer surface to form a thin film.
- a film forming gas and a rare gas are mixed and introduced into the process chamber at a flow rate of about 100 cc / min.
- a plasma is generated while maintaining the pressure at about 100 Pa, and the film-forming gas is decomposed using the plasma, and deposited on the wafer surface heated to 300: about 25 degrees to form a thin film. Has formed.
- a plasma is generated while maintaining the pressure in the chamber at several Pa while mixing and introducing an etching gas and a rare gas into the process chamber.
- the etching gas is then excited, and etching is performed using the excited ions.
- a gas species other than those contributing to film formation for example, nitrogen, oxygen, moisture, etc., is present in the processing atmosphere, a predetermined value is obtained. Thin film cannot be formed or cannot be etched.
- a metal wiring for a semiconductor integrated circuit is formed using a sputtering apparatus
- the metal thin film is oxidized, and the resistance of the wiring increases.
- the crystal structure may change, such as tantalum (T a).
- oxygen, moisture, organic impurities, etc. are present in the atmosphere in which a polycrystalline silicon thin film is formed by plasma CVD, the size of the crystal grains becomes uneven, and the electron mobility becomes extremely high.
- Various problems such as lowering occur.
- impurities are present during etching by reactive ion etching, the selection ratio of the material cannot be obtained, resulting in defective etching or damage to the wafer. Therefore, it is necessary to reduce the impurities in the rare gas introduced into the equipment using plasma to several PPb or less.
- FIG. 4 is a system diagram showing a conventional example of a sputtering apparatus as an example of a plasma processing apparatus.
- a loading chamber 3 for transporting a wafer 2 is provided in front of the process chamber 1, and the wafers 2 are processed one by one.
- the inside of the loading chamber 3 is a purge gas atmosphere such as dry air or nitrogen gas supplied from a purge gas supply unit 4, and the vacuum exhaust pumps 6 a and 6 connected to the loading chamber 3 via a gate valve 5.
- the pressure is kept low by b.
- the unprocessed wafer 2 held in the loading chamber 3 is evacuated from the opening chamber 3 and the process chamber 1, and then passes through the gate valve 7 separating the chambers 1, 3 to process the wafer 2. It is set on the wafer susceptor 8 in the chamber.
- the rare gas from which impurities have been removed through the purifier 9 is introduced into the process chamber 1 from the gas supply device 10 via the line 10a.
- a cycle consisting of evacuation of the process chamber by the vacuum pumps 11a and 11b and introduction of the rare gas from the gas supply device 10 is performed as follows.
- Command from controller 1 2 Is repeated one or more times by opening and closing each valve in a predetermined order.
- plasma is generated in the process chamber by applying a high frequency from a high frequency power supply 14 through a matching circuit 13, and the generated plasma causes the solid deposition material to be sputtered.
- a thin film is deposited on the wafer.
- the wafer 2 on which the predetermined thin film is formed is transferred from the process chamber 1 to the next process via the loading chamber 3 for the next processing. In such a process, loading and unloading of wafers are performed about 30 times per hour.
- the exhaust gas evacuated from the sputtering apparatus via the evacuation pumps 11a and lib is used for forming a film even if it is for purging in a process chamber.
- the rare gas supplied from the rare gas container 16 is only slightly present in the atmosphere.
- the concentration of xenon is 0.086 ppm in the atmosphere.
- the exhaust gas (exhaust gas when most became noble gas) discharged from the exhaust path 15 to the outside of the system is collected in a separately provided container or balloon, and the collected gas is concentrated and rectified. To separate the rare gas and use it again. According to this recovery method, the exhausted rare gas is collected in a container or balloon, so that the rare gas after concentrated rectification can be used in various industrial fields, but the rare gas is recovered.
- FIG. 5 is a system diagram in which an example of a conventional rare gas recovery device is applied to the sputtering device of FIG. That is, the conventional rare gas recovery device, as shown in Fig. 5,
- an exhaust path 15 of the sputtering apparatus 21 formed in the same manner as described above is provided with a recovery path 23 connected to the rare gas recovery apparatus 22, and an outlet path 24 of the rare gas recovery apparatus 22. Is connected to the purifier 9 and is connected to the recovery path 23 and the exhaust path 15
- the exhaust gas (noble gas) discharged from the process chamber 1 is introduced into the noble gas recovery device 22 by switching the pair of switching valves 25 a and 25 b provided respectively to open and close.
- the rare gas introduced into the rare gas recovery device 22 is boosted to a predetermined pressure by a compressor 27 having a bypass path 26, and then merges with the rare gas replenished from the rare gas container 16 as appropriate. It is sent to the purifier 9, purified in the purifier 9, and reused by circulation.
- the gas flow rate drops sharply, and not only rare gases but also impurity components easily accumulate inside the back pump and on the secondary side of the back pump. In this case, it is necessary to purge the outside of the system with a large amount of rare gas, and it is impossible to recover the rare gas with high efficiency by the recovery device 22 as shown in FIG.
- the recovery device 22 As shown in FIG.
- the absolute amount of the impurity components becomes large, so that the life of the purifier 9 is extremely shortened and the rare gas is diluted. The inconvenience that the purity of the gas is reduced occurs.
- An object of the present invention is to efficiently collect a rare gas discharged from a rare gas using equipment such as a plasma processing apparatus that uses a rare gas under reduced pressure, and to achieve a predetermined purity for the rare gas using equipment. It is an object of the present invention to provide a rare gas recovery method and apparatus capable of stably supplying the rare gas and reducing the consumption of the rare gas. Disclosure of the invention
- the first method for recovering a rare gas of the present invention includes the steps of: recovering a rare gas in exhaust gas discharged from a rare gas use facility operated under reduced pressure; The operation of switching between introducing the exhaust gas into the recovery system and discharging the exhaust gas into the exhaust system is performed according to the concentration of the impurity component contained in the exhaust gas.
- the rare gas in the present invention is xenon (Xe), argon (Ar), krypton (Kr), neon (Ne), or a mixed gas of two or more of these.
- the second method for recovering a rare gas of the present invention when recovering a rare gas in exhaust gas discharged from a rare gas-using facility operated under reduced pressure, introducing the exhaust gas into a recovery system and exhausting the rare gas into an exhaust system And discharge of the gas under reduced pressure.
- This switching operation is performed according to the concentration of the impurity component contained in the exhaust gas or the operation state of the rare gas use facility.
- the rare gas recovery apparatus includes: a rare gas using facility operated under reduced pressure; a first vacuum pump for sucking exhaust gas discharged from the rare gas using facility; and a first vacuum pump.
- a second evacuation pump provided in series on the next side via a decompression line, a recovery line branched from the decompression line via line switching means, a recovery vacuum pump provided on the recovery line,
- a compressor for increasing the pressure of the recovered gas derived from the vacuum pump for recovery, a storage tank for storing the compressed recovered gas, and purifying the rare gas by removing impurities in the recovered gas derived from the storage tank.
- a rare gas supply line for supplying a purified rare gas to the rare gas use facility.
- an abatement apparatus for removing the abatement target component contained in the recovered gas from which the recovery vacuum pump is led.
- an impurity concentration detecting means for measuring an impurity concentration in the recovered gas is provided at a subsequent stage of the abatement apparatus, and a collecting means is provided between the impurity concentration detecting means and the compressor in accordance with the measured impurity concentration.
- An exhaust line for exhausting gas is branched via line switching means.
- the storage tank is provided with a pressure detecting means, and a rare gas replenishing means for introducing a rare gas into the storage tank in accordance with a detection value of the pressure detecting means is provided.
- emitted from the rare gas use installations can be collect
- FIG. 1 is a system diagram showing one embodiment in which the rare gas recovery device of the present invention is applied to a sputtering device.
- FIG. 2 is a system diagram of a main part showing a connection example when the rare gas recovery device of the present invention is applied to a plurality of rare gas use facilities.
- FIG. 3 is a system diagram showing an example of an embodiment in which the rare gas recovery device of the present invention is applied to a rare gas use facility using a film forming gas.
- FIG. 4 is a system diagram showing an example of a conventional plasma processing apparatus.
- FIG. 5 is a system diagram showing an example in which a conventional rare gas recovery device is applied to the plasma processing device of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a system diagram showing one embodiment in which the rare gas recovery device of the present invention is applied to a sputtering device that is a rare gas use facility. Note that each component in the sputtering apparatus is denoted by the same reference numeral as the corresponding component of the sputtering apparatus shown in FIG. 4, and a detailed description thereof will be omitted.
- the rare gas recovery device 31 recovers and purifies the rare gas discharged from the sputtering device 21 configured as described above, and supplies the purified rare gas to the sputtering device 21 again.
- a vacuum line is formed between a first vacuum pump 11a for evacuating the process chamber 1 and a second vacuum pump 11b provided in series on the secondary side thereof.
- the sputtering device 21 is connected to a branched recovery line 32 and a rare gas supply line 33 for supplying the rare gas purified by the refiner 9 to the gas supply device 10.
- the recovery line 32 and the decompression line 17 are provided with a pair of switching valves 34a and 34b, respectively, as line switching means for switching a gas flow path.
- the switching valves 34 a and 34 b are connected to the purity monitor provided in the outlet path of the process chamber 1.
- the opening / closing operation 35 is performed by a command output from the control device 12 in accordance with the detected impurity concentration.
- the opening / closing operation is performed in such a manner that one side is opened and the other side is closed. For example, when the impurity concentration detected by the purity monitor 35 exceeds 100 ppm, by closing the switching valve 34a and opening the switching valve 34b, the exhaust gas is discharged to the second vacuum pump 11b.
- the switching valve 34 b is closed and the switching valve 34 a is opened to collect the exhaust gas in the recovery line 3 of the recovery system. Operates to introduce into 2. However, even if the impurity concentration is high, if there is a component in the impurity that can be removed by the removal device (abatement device) provided in the recovery system, this component is excluded.
- a turbo molecular pump is used for the first vacuum pump 11a, and a dry pump or a screw pump is used for the second vacuum pump 11b.
- the pressure in the pressure reducing line 17 is reduced to about 100 Pa.
- the pressure in the process chamber 1 is set to about 1 Pa (Pascal), and the pressure in the loading chamber 3 is set to about 10 to 8 Pa.
- the rare gas recovery device 31 includes a recovery vacuum pump 36 for sucking exhaust gas under reduced pressure from the pressure reducing line 17, a removal device 37 for removing metal particles contained in the exhaust gas, A compressor 38 for raising the exhaust gas to a predetermined pressure, a storage tank 39 for storing the exhaust gas at a predetermined pressure, the purifier 9 and a rare gas container 16 for replenishing the rare gas are provided.
- the equipment using noble gas is equipment that uses harmful components such as reactive gas, such as plasma CVD equipment or reactive ion etching equipment, it is necessary to remove harmful components contained in exhaust gas. Therefore, in addition to the removal device 37, a detoxification device using a detoxification agent (reactant, adsorbent, etc.) is installed.
- the abatement device may be formed separately from the removal device 37, or may be formed integrally with the removal device 37.
- the method of the present invention will be described based on a procedure for recovering a rare gas.
- the pressure in the loading chamber 3 and the process chamber 1 becomes substantially equal and the gate valve 7 separating the chambers 1 and 3 is opened, the gate of the wafer 2 before processing in the loading chamber 3 is opened.
- Through valve 7 onto wafer susceptor 8 in process chamber 1 Will be installed.
- a purge gas is supplied from the purge gas supply unit 4 into the process chamber 1, and the purge gas is maintained in a reduced pressure state while the purge gas is being supplied.
- Nitrogen is usually used as the purge gas, but the type of purge gas can be selected according to the process and is not specific to nitrogen.
- the first vacuum pump (turbo molecular pump) connected to the process chamber 1 via the valve 18
- the air is evacuated by 11a and the second vacuum pump (back pump) 11b connected to it.
- the rare gas from which impurities were removed through the purifier 9 was introduced into the process chamber 1 at a flow rate of 500 cc / min through the gas supply device 10 to make the process chamber 1 a rare gas atmosphere.
- a high frequency is applied from the high frequency power supply 14 to generate plasma by high frequency discharge.
- the pressure at the time of plasma generation is usually 1 Pa.
- the solid plasma deposition material is sputtered by the generated plasma, and a thin film is deposited on the wafer 2.
- the wafer 2 on which the predetermined thin film has been formed is transferred from the process chamber 1 to the next process via the loading chamber 3 for the next process of i s.
- the rare gas used for depositing the thin film is pushed out of the process chamber 1 by the purge gas.
- loading and unloading of the wafer 2 is performed about 20 times per hour.
- Vacuum is evacuated through a valve 18 that isolates the 20 exhaust pump 11a, and the impurity concentration in the exhaust gas is measured by a purity monitor 35 installed upstream of the valve 18.
- the purity monitor 35 since the purity monitor 35 measures the impurity component in the rare gas, it is desirable that the purity monitor 35 be of a type capable of performing in-situ measurement (in-situ measurement) in order to improve the recovery efficiency of the rare gas.
- the purity monitor 35 since measurement is performed under reduced pressure, the purity monitor 35
- the purity monitor 135 is installed upstream of the valve 18. It may be the primary side of valves 34a, 34b. At this time, the purity monitor 135 can use various devices as long as it can perform in-situ measurement and can perform measurement under reduced pressure. For example, an FT-IR or laser can be used as a light source. The used spectroscopic analyzer can be suitably used.
- the impurity concentration of oxygen, nitrogen, moisture, carbon monoxide, carbon dioxide, carbon fluoride, hydrogen, various kinds of film forming gases, and the like in the exhaust gas is measured by the purity monitor 35, and the measurement signal is sent to a control device. It is transmitted to 12.
- the impurity concentration (the concentration of the impurity that cannot be removed by the removing device 37) becomes, for example, 100 ppm or less, preferably 10 ppm or less
- a signal from the control device 12 is used.
- the switching valve 34 b installed upstream of the second evacuation pump 1 1 b is closed and the switching valve 34 a provided for the recovery line 32 is opened, the exhaust gas flow is reduced.
- the operation is switched from 7 to the recovery line 32, and the exhaust gas mainly composed of the rare gas is introduced into the rare gas recovery device 31.
- the exhaust gas passage can be switched also on the primary side of the first evacuation pump 11a, but in this case, the recovery vacuum pump 36 has the same suction power as the turbo molecular pump. It is necessary to use what you have.
- the exhaust gas introduced into the rare gas recovery device 31 is sucked by the recovery vacuum pump 36 and sent to the removal device 37.
- the removal device 37 in the present embodiment has a main purpose of removing metal particles, and is mainly configured with a metal filter or the like. However, as described above, harmful components contained in exhaust gas are used.
- the main components are a reactant for removing the reactive gas molecules by an oxidation reaction and an adsorbent for adsorption and removal.
- the reactant copper oxide, iron oxide, nickel oxide, platinum, a mixture thereof, or the like can be used.
- adsorbent activated carbon, alumina, synthetic zeolite, or the like can be used. is not.
- a cooling cylinder may be appropriately provided to remove the reactive gas molecules by liquefaction or solidification.
- the exhaust gas that has passed through the removal device 37 is introduced into a compressor 38 and pressurized to a predetermined pressure, for example, 1 to 8 kg Zcm 2 G.
- a reciprocating compressor is used for the compressor 38, but this is not a limitation.
- the compressed exhaust gas passes through a valve 38a on the secondary side of the compressor that operates simultaneously with the switching valve 34a and a check valve (not shown).
- Storage tank (buffer tank) 39 Stored temporarily in 9.
- the buffer tank 39 is provided with a pressure sensor 40.
- the pressure control unit 41 is supplied from the rare gas container 16 to the pressure sensor unit 41.
- a rare gas at an appropriate pressure is successively introduced via the reactor.
- the capacity of the buffer tank 39 depends on the volume from the process chamber 1 and the process chamber 1 to the second vacuum pump 11b, but the volume from the process chamber 1 to the second vacuum pump 11b. It is sufficient if it is equal to or more than.
- the rare gas stored in the buffer tank 39 is introduced into the purifier 9 via the valve 42, and impurities in the rare gas, such as water, nitrogen, oxygen, carbon monoxide, carbon dioxide, and hydrogen, are passed through the purifier 9. , Various hydrocarbons are removed.
- impurities in the rare gas such as water, nitrogen, oxygen, carbon monoxide, carbon dioxide, and hydrogen
- Various hydrocarbons are removed.
- the purifier 9 various methods, for example, an adsorption method or a membrane separation method can be used, but a getter-type purifier using a metal or alloy such as titanium, vanadium, zirconium, iron, nickel or the like can be used. It is suitable.
- the impurity concentration in the rare gas is measured at the time of recovery by the purity monitor 135, so that a rare gas having a known impurity concentration is introduced into the purifier 9.
- the performance (impurity removal efficiency) of a getter-type purifier depends on the inlet impurity concentration and the superficial velocity, so when the impurity concentration becomes 100 ppm or more, the superficial velocity decreases, that is, Therefore, the size of the refiner 9 must be increased. Therefore, if the impurity concentration is 100 ppm or less, preferably 10 ppm or less, the inner diameter of the gas cylinder may be about 30 mm when the standard processing flow rate is 1 liter per minute, and downsizing is possible. . It is also possible to make an optimal design as appropriate according to the required flow rate. Furthermore, by providing an integrating flow meter in the purifier 9, the life of the getter can be calculated, and the time for replacing the getter can be predicted.
- a circulation line 45 for circulating gas is provided on the side.
- the valve 46 When no rare gas is introduced into the rare gas use device (spring device 21), open the valve 46 to return the rare gas from the purifier 9 to the compressor 38 and pass it through the buffer tank 39. And circulate through the purifier 9.
- the circulation line 45 is provided between the gas supply device 10 and the primary side of the compressor 38. It may be connected in between.
- the rare gas from which impurities have been removed by the purifier 9 is introduced into the process chamber 1 from the rare gas supply line 33 through the gas supply device 10, and is reused.
- the rare gas is used in the preliminary exhaust process immediately after the wafer 2 is introduced into the process chamber 1 and during the deposition of a thin film due to the generation of plasma.
- the noble gas used in depositing the thin film has a sufficiently low impurity concentration, so that all of it can be recovered and recycled.
- most of the rare gas used in the sputtering apparatus 21 can be recovered and circulated and used, so that a required amount of the rare gas is used at a required purity and at low cost. be able to.
- the size and the life of the purifier 9 can be reduced.
- the rare gas does not stay in the pump section or the like, so that the rare gas discharged from the process chamber 1 can be efficiently collected.
- the impurity concentration becomes low during the deposition of the thin film, so that the rare gas can be efficiently collected and reused by switching the exhaust gas line according to the operation state of the sputtering apparatus 21. it can.
- the required amount of the rare gas can be surely replenished, and one purifier In step 9, the rare gas can be purified.
- the compressor 38 is normally always operated at a commercial frequency.However, since the pressure on the primary side of the compressor fluctuates in accordance with switching to the recovery system, it is necessary to perform stable operation. However, it is necessary to bypass the primary and secondary sides of the compressor and provide a pressure regulator in the system. However, in this method, the rare gas compressed by the compressor 38 is compressed again, so that the operating cost for compression may increase. In order to reduce the operating cost of the compressor, it is preferable to provide the compressor 38 with an inverter control mechanism. In this case, the compressor 38 can be operated in an optimal state based on the signal from the pressure sensor provided on the primary side of the compressor 38.
- the pressure on the primary side of the compressor is lower than the reference pressure, that is, if the amount of exhaust gas introduced into the recovery system is small, control the frequency to be lower. If the pressure on the primary side of the compressor is higher than the reference pressure, By controlling to increase the frequency, it is possible to constantly control the pressure on the primary side of the compressor while reducing the power consumption of the compressor 38, and the long life of the compressor 38 Driving becomes possible.
- FIG. 2 shows an example in which a plurality of rare gas use facilities, for example, three sputtering devices 21 are connected to the rare gas recovery device 31. That is, the three recovery lines 32 branched from the pressure reducing lines 17 of the respective sputtering devices 21 are connected to one main recovery line 51 downstream of the switching valve 34a. 1 is connected to a recovery vacuum pump 36, and the rare gas supply line 33 is connected to each sputtering device 21 via a branch line 52.
- the main components of the rare gas recovery device and the rare gas use equipment shown in this embodiment can be formed in the same manner as the rare gas recovery device 31 and the sputtering device 21 shown in FIG. The same components are denoted by the same reference numerals, and detailed description is omitted.
- each of the sputtering apparatuses 21 includes a process chamber 1, an opening chamber 3, a purge gas supply unit 4, a gate valve 5, vacuum pumps 6a and 6b, and a gate.
- Valve 7, evacuation pump 11a, control device 12, matching circuit 13, high frequency power supply 14, valve 18 and purity monitor 135 are provided.
- the configuration, function, and operation of the rare gas recovery device 31 are the same as described above, but the operation cycle of each sputtering device 21 is adjusted so that the rare gas recovery device 31 can be operated in a stable state.
- the shift period (t Z 3) can be appropriately set depending on the equipment for using the rare gas and the process time, and an arbitrary shift period can be selected.
- the gas of each sputtering apparatus 21 is used.
- the rare gas recovery device 31 can be operated in a more stable state.
- Fig. 3 shows rare gas recovery suitable for rare gas-using equipment, such as a plasma CVD device or a reactive ion etching device, which uses a mixture of a film forming gas such as a reactive gas or an etching gas and a rare gas. It is a system diagram showing an example of one form of a device.
- the main components of the rare gas recovery device and the rare gas use facility shown in the present embodiment are the same as those of the rare gas recovery device 31 and the rare gas use facility (sputtering device 21) shown in FIG. Since they can be formed, the same components are denoted by the same reference numerals, and detailed description is omitted.
- a film forming gas supply line 60 is provided downstream of the gas supply device 10, and a rare gas supplied from the gas supply device 10 and a film formation gas supply line 60 are provided.
- a film forming gas such as a reactive gas or an etching gas supplied from the supply source 61 through the flow controller 62, for example, a reactive gas such as monosilane, ammonia, or phosphine, or various doping gases.
- the gas is mixed in the mixer 63, and the gas mixed in the mixer 63 is supplied to the process chamber 1.
- a pair of switching valves 7 upstream of the compressor 38 are provided on the rare gas recovery device side.
- a second line switching means 72 composed of 2 a and 72 b is provided, and an abatement device 73 is provided between the second line switching means 72 and the recovery vacuum pump 36.
- a purity monitor 74 are provided.
- the second line switching means 72 includes a controller 75 which opens and closes the switching valves 72a and 72b in accordance with the purity of the rare gas detected by the purity monitor 74, that is, the impurity concentration. When the impurity concentration is sufficiently low, the switching valve 72a opens and the switching valve 72b closes, and when the impurity concentration is high, the switching valve 72b opens. It operates so that the switching valve 72a is closed.
- the recovery side switching in the first line switching means 71 is performed.
- the valve 34a is closed, and the exhaust side switching valve 34b is open, and supplied to the process chamber 1 and the turbo molecular pump 11a
- the purge gas for example, nitrogen gas, which is drawn into the pressure reducing line 17 and discharged to the outside through the exhaust path 15 via the switching valve 34 b and the back pump 11 b is discharged.
- both the switching valves 34a and 34b in the first line switching means 71 are switched and opened and closed, and the 5 pressure reducing line 17 is connected.
- the flowing exhaust gas is sucked into the recovery vacuum pump 36 via the switching valve 34a.
- the purity of the noble gas is monitored by the purity monitor 74. Purity (impurity concentration) is measured.
- the purity monitor 74 since the installation position of the purity monitor 74 is a line at the atmospheric pressure 10 state on the secondary side of the recovery vacuum pump, the purity monitor 74 may be a gas chromatograph in addition to the above-described various devices. It is also possible to use a graph or the like.
- the impurity concentration measured by the purity monitor 74 is sent to the controller 75, and as described above, the switching valves 72a and 72 of the second line switching means 72 are switched and opened and closed according to the impurity concentration.
- Exhaust gas having a low impurity concentration passes through the switching valve 72a, is compressed to a predetermined pressure by the compressor is 38, is once stored in the buffer tank 39 as described above, is purified by the purifier 9, and is diluted.
- the gas is supplied again from the gas supply line 33 into the process chamber 1 via the gas supply device 10 and the mixer 63.
- Exhaust gas with a high impurity concentration is returned to the primary side of the back pump 1 lb via the exhaust line 76 by opening the switching valve 72 b and closing the switching valve 72 a.
- the xenon gas recovery operation was performed using the rare gas recovery equipment and the rare gas recovery device shown in Fig. 1, and the recovery rate was measured.
- the xenon gas recovery rate was calculated from the newly introduced amount measured by a flow meter provided downstream of the pressure control unit 41 and the flow rate used in the gas supply device 10.
- the main components of the rare gas recovery device are as follows: It is on the street.
- Purifier 9 Ti alloy getter type, allowable pressure 10 kgZcm 2 , working flow 1 liter per minute
- Buffer tank 39 316L stainless steel, internal volume 15 liters, allowable pressure 10 k / cm 2
- Pressure control unit 41 Piezo control type, pressure control range 1.5 to 9.5 kg / c
- Compressor 38 reciprocating, up pressurizing pressure 8 k gZcm 2, prior to the breakdown voltage 15 k gZ cm 2 recovery operations, launched a rare gas collecting apparatus by the following procedure.
- the inside of the pressure control unit 41, the buffer tank 39, the compressor 38, and the purifier 9 is evacuated by the vacuum pump of the helium leak detector 81 connected to the downstream side of the buffer tank 39, as shown in FIG. A leak test was performed.
- xenon gas was introduced from the rare gas container 16 via the pressure control unit 41 while the inside of each part was kept in a vacuum state. The introduction pressure was measured by a pressure sensor and was increased to 3 kg cm 2 .
- the start the purifier 9 and the compressor 38 was evacuated process chamber 1 to 10- 7 P a.
- the rare gas recovery device started up in this way, the operation of recovering the rare gas discharged from the magnetron sputtering device, which is a rare gas-using facility, was performed.
- the magnetron sputtering apparatus aluminum was used as a solid material for film formation.
- the gate valve that separates the process chamber from the loading chamber opens and closes only when loading and unloading wafers, and the loading and unloading time for wafers is 30 seconds.
- nitrogen gas was introduced as a purge gas into the opening chamber and the process chamber so that the pressure became 1 Pa.
- xenon gas was introduced at 1500 cZ for 10 seconds to perform preliminary evacuation. Thereafter, plasma was generated at a pressure of 1 Pa while flowing xenon at a flow rate of 1500 cZ, and film formation was performed for 1 minute.
- the purity monitor confirmed that the xenon gas was replaced with nitrogen gas in a few seconds as the wafer was loaded into and unloaded from the process chamber.
- impurities mainly composed of nitrogen gas were replaced by xenon gas.
- the impurity concentration fell below 10 ppm in the middle of the pre-evacuation process, xenon gas was not recovered in the pre-evacuation process, but was collected only during film formation.
- the amount of new xenon gas introduced was 900 cc per hour. Since the total amount of gas introduced into the process chamber is 6300 cc, the recovery is about 86%.
- a plasma CVD device for forming polycrystalline silicon As equipment for using rare gas, a plasma CVD device for forming polycrystalline silicon was used.
- the configuration of the plasma CVD apparatus is the same as that shown in FIG. 1 except that a film forming gas supply line 60 as shown in FIG. 3 is provided downstream of the gas supply apparatus 10.
- Used was monosilane.
- the substrate was a 300 mm square glass substrate, and the substrate temperature was 300 ° C.
- the gate valve that separates the process chamber from the loading chamber opens and closes only when loading and unloading wafers, and the loading and unloading time of wafers is 30 seconds. Before unloading and loading the wafer, nitrogen gas was introduced into the opening chamber and the process chamber so that the pressure was 100 Pa.
- xenon gas and monosilane gas were introduced at a ratio of 100: 1 to 100 ccZ for 10 seconds to perform preliminary evacuation. Thereafter, film formation was performed for 110 seconds while flowing xenon gas and monosilane gas at a pressure of 100 Pa at a ratio of 100: 1 to a total flow rate of 3000 cZ. This process was repeated and processed at a rate of 24 sheets / hour. In this experiment, film formation was performed by changing the total flow rate during film formation from 300 cc Z to 300 cc Z, and the surface flatness, uniformity, and crystallite size of polycrystalline silicon were changed. Was measured. As a result, the test performed at a flow rate of 300 cc c Z was the best.
- the purity monitor confirmed that the xenon gas was replaced by nitrogen gas in a few seconds as the wafer was loaded into and unloaded from the process chamber. Was done. During the preliminary evacuation process, the concentration of impurities other than monosilane gas became 10 ppm or less. At times, we began collecting xenon gas. No monosilane gas component was observed in the exhaust gas during the film formation. This is because the monosilane gas was completely decomposed by the high-density plasma. The amount of new xenon gas introduced was 396 cc per hour. Since the total amount of gas introduced into the process chamber is about 134650 cc, the recovery is about 97%.
- a plasma CVD device for forming a film of doped polycrystalline silicon was used as equipment for using noble gas.
- a film formation gas supply line was attached to the apparatus having the configuration shown in FIG. 1, and monosilane was used as the film formation gas, and phosphine was used as the doping gas.
- the substrate was a glass substrate measuring 300 mm square, and the substrate temperature was set at 300 ° C.
- the gate valve that separates the process chamber from the loading chamber opens and closes only when loading and unloading wafers, and the loading and unloading time of wafers is 30 seconds. Before loading and unloading wafers, nitrogen gas was introduced into the loading chamber and the process chamber so that the pressure was 100 Pa.
- xenon gas, monosilane gas, and phosphine gas are introduced at a rate of 100 000: 1: 100: 1 for 100 seconds, and are reserved for 10 seconds. Exhaust was performed. Thereafter, at a pressure of 100 Pa, xenon gas and monosilane gas were flowed at a ratio of 100: 1 at a total flow rate of 300 cc Z, and film formation was performed for 160 seconds. This process was repeated and processed at a speed of 18 sheets.
- the xenon gas was replaced with nitrogen gas in a few seconds as the wafer was loaded into and unloaded from the process chamber.
- impurities mainly composed of nitrogen gas were replaced by xenon gas and monosilane gas.
- the impurity concentration other than monosilane gas and phosphine gas became 10 ppm or less.
- the pre-evacuation process did not collect xenon gas, but only xenon gas during film formation. No monosilane gas and no phosphine gas components were observed in the exhaust gas during the film formation. This is because the monosilane gas and the phosphine gas were completely decomposed by the high-density plasma.
- the amount of new xenon gas introduced was 297 cc per hour. Since the total amount of gas introduced into the process chamber is about 1,545,400 cc, the recovery is about 98%.
- a plasma CVD apparatus for forming a silicon nitride film was used for the equipment using a rare gas, and monosilane and ammonia were used for the gas for film formation.
- the substrate was a glass substrate of 300 mm square and the substrate temperature was 300 ° C.
- the gate valve that separates the process chamber from the loading chamber opens and closes only when loading and unloading wafers, and the loading and unloading time for wafers is 30 seconds. Before loading and unloading the wafer, nitrogen gas was introduced into the loading chamber and the process chamber so that the pressure became 100 Pa.
- preliminary exhaust was performed by introducing xenon gas, monosilane gas, and ammonia gas at a ratio of 100: 1: 5 for 100 seconds at 100 ccZ. Thereafter, a film is formed for 160 seconds while flowing xenon gas, monosilane gas, and ammonia gas at a pressure of 100 Pa at a flow rate of 100: 1: 5 at a total flow rate of 300 cc / min. went. This process was repeated, and processing was performed at a speed of 18 sheets at Z hour.
- the process gas containing xenon gas as a main component is replaced with nitrogen gas in a few seconds.
- Replaced by Xenon gas is not collected during the pre-evacuation process, and xenon is collected only during the film formation process.
- no monosilane gas component was detected in the exhaust gas during film formation, but about 100 ppm of ammonia gas component was detected.
- the nitrogen gas component was less than 100 ppm. Since the ammonia gas is removed by the detoxification device installed on the secondary side of the recovery vacuum pump, xenon gas can be recovered from the exhaust gas during the film forming process even if the ammonia content is large.
- the amount of new xenon gas introduced is 280 cc per hour, and the total amount of gas introduced into the process chamber is about 135 850 cc, so that the recovery is about 98%.
- argon gas was used instead of xenon gas, and a reactive ion etching system that etches boron phosphorus glass (BPSG) was used for the equipment using the rare gas.
- C 4 F 8 and carbon monoxide as etching gas As well as oxygen.
- the substrate is an 8-inch Si wafer on which 8 to 30 are deposited for 1.5 m.
- a mask material called resist is coated on the substrate, and the mask material is exposed and developed.
- a hole park with a diameter of 0.18 m was formed at the center.
- the device configuration was the same as in Example 2.
- the gate valve that separates the process chamber from the loading chamber opens and closes only when loading and unloading wafers, and the loading and unloading time for wafers is 30 seconds.
- nitrogen gas was introduced into the loading chamber and process chamber so that the pressure was 5 Pa.
- gas ratio, C 4 F 8: 5% , CO: 15%, oxygen: 2% and argon: 78% of the gas is introduced for 10 seconds at a total flow rate of 500 cc / min
- Preliminary exhaust was performed.
- etching was performed for 1 minute at a pressure of 5 Pa while flowing a process gas having the above gas ratio at a total flow rate of 1000 cc / min. This process was repeated and processed at the speed of 36 sheets.
- the process gas was replaced with nitrogen gas in a few seconds as the wafer was loaded into and unloaded from the process chamber, and the nitrogen gas was replaced by the process gas in the preliminary evacuation process, but argon was not recovered in this preliminary evacuation process. .
- C-F compounds, SiF 4 , carbon dioxide and argon were mainly observed as gas components during film formation, but oxygen was oxidized to C ⁇ and the resist. Consumed and hardly measured. Since reactive gas molecules other than oxygen and argon can be removed by the abatement equipment, argon gas was recovered during film formation regardless of their content.
- the amount of new argon gas introduced is 2380 cc per hour and the total amount of gas introduced into the process chamber is about 30420 cc, so the recovery rate is about 92%
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98955950A EP0983791B1 (en) | 1997-12-01 | 1998-11-27 | Method and apparatus for recovering a noble gas |
KR10-1999-7006693A KR100370776B1 (ko) | 1997-12-01 | 1998-11-27 | 희가스의 회수방법 및 장치 |
DE69825275T DE69825275T2 (de) | 1997-12-01 | 1998-11-27 | Verfahren und vorrichtung zur rückgewinnung von edelgas |
US09/355,556 US6217633B1 (en) | 1997-12-01 | 1998-11-27 | Method and apparatus for recovering rare gas |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP33022897A JP4112659B2 (ja) | 1997-12-01 | 1997-12-01 | 希ガスの回収方法及び装置 |
JP9/330228 | 1997-12-01 |
Publications (1)
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WO1999028023A1 true WO1999028023A1 (fr) | 1999-06-10 |
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ID=18230296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP1998/005335 WO1999028023A1 (fr) | 1997-12-01 | 1998-11-27 | Procede et appareil de recuperation de gaz rare |
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Country | Link |
---|---|
US (1) | US6217633B1 (ja) |
EP (1) | EP0983791B1 (ja) |
JP (1) | JP4112659B2 (ja) |
KR (1) | KR100370776B1 (ja) |
DE (1) | DE69825275T2 (ja) |
TW (1) | TW473456B (ja) |
WO (1) | WO1999028023A1 (ja) |
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- 1998-11-27 KR KR10-1999-7006693A patent/KR100370776B1/ko not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
JPH11157814A (ja) | 1999-06-15 |
EP0983791A4 (en) | 2000-05-03 |
EP0983791B1 (en) | 2004-07-28 |
US6217633B1 (en) | 2001-04-17 |
EP0983791A1 (en) | 2000-03-08 |
DE69825275T2 (de) | 2005-07-21 |
KR100370776B1 (ko) | 2003-02-05 |
TW473456B (en) | 2002-01-21 |
DE69825275D1 (de) | 2004-09-02 |
JP4112659B2 (ja) | 2008-07-02 |
KR20000070456A (ko) | 2000-11-25 |
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