WO2022091713A1 - ガス供給システムおよびガス供給方法 - Google Patents
ガス供給システムおよびガス供給方法 Download PDFInfo
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- WO2022091713A1 WO2022091713A1 PCT/JP2021/036783 JP2021036783W WO2022091713A1 WO 2022091713 A1 WO2022091713 A1 WO 2022091713A1 JP 2021036783 W JP2021036783 W JP 2021036783W WO 2022091713 A1 WO2022091713 A1 WO 2022091713A1
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- Prior art keywords
- valve
- vaporization
- gas
- supply device
- opening
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- 238000000034 method Methods 0.000 title claims description 31
- 230000008016 vaporization Effects 0.000 claims abstract description 251
- 238000009834 vaporization Methods 0.000 claims abstract description 235
- 239000007788 liquid Substances 0.000 claims description 45
- 239000002994 raw material Substances 0.000 claims description 40
- 239000007769 metal material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 182
- 238000011144 upstream manufacturing Methods 0.000 description 13
- 230000007423 decrease Effects 0.000 description 11
- 238000010926 purge Methods 0.000 description 11
- 238000011084 recovery Methods 0.000 description 5
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 2
- XCZXGTMEAKBVPV-UHFFFAOYSA-N trimethylgallium Chemical compound C[Ga](C)C XCZXGTMEAKBVPV-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- LXEXBJXDGVGRAR-UHFFFAOYSA-N trichloro(trichlorosilyl)silane Chemical compound Cl[Si](Cl)(Cl)[Si](Cl)(Cl)Cl LXEXBJXDGVGRAR-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
- F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0302—Heat exchange with the fluid by heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/043—Pressure
Definitions
- the present invention relates to a gas supply system and a gas supply method, and in particular, a gas supply system and a gas supply method configured to continuously supply a gas generated by using a vaporization supply device at a relatively large flow rate. Regarding.
- the pressure type flow rate control device can control the mass flow rate of various fluids with high accuracy by a relatively simple configuration that combines a control valve and a throttle portion on the downstream side thereof (for example, an orifice plate or a critical nozzle). , Widely used (for example, Patent Document 1).
- the pressure type flow rate control device has an excellent flow rate control characteristic that stable flow rate control can be performed even if the supply pressure on the primary side of the control valve fluctuates greatly.
- HCDS Si 2 Cl 6 : Hexachlorodisilane
- SiN x film silicon nitride film
- SiO 2 film silicon oxide film
- Patent Document 2 and Patent Document 3 by the present applicant disclose a vaporization supply device that can be used for HCDS and organic metal materials (for example, TEOS: tetraethyl orthosilicate).
- the liquid raw material of HCDS or organic metal is pumped from the raw material tank to the vaporization section and heated by the heater in the vaporization section.
- the raw material gas generated in the vaporization unit is supplied to the process chamber after the flow rate is controlled by using the control valve on the downstream side.
- the opening degree of the control valve is feedback-controlled based on the pressure on the upstream side of the throttle portion (sometimes referred to as upstream pressure), as in the conventional pressure type flow rate control device.
- upstream pressure sometimes referred to as upstream pressure
- the raw material gas generated in the vaporization section can be flowed to the downstream side of the throttle section at a desired flow rate.
- the gas generation capacity of the vaporization supply device is also required to be high.
- the entire supply path must be maintained at a high temperature of, for example, 200 ° C. or higher to prevent re-liquefaction, and the system must be able to cope with a high temperature environment. be.
- the present invention has been made to solve the above problems, and is a gas supply system capable of controlling and flowing HCDS gas or organic metal gas generated by using a vaporization supply device at a relatively large flow rate. Its main purpose is to provide a gas supply method.
- the gas supply system includes a first vaporization unit in which raw materials are stored and having a heater, a first valve provided in a flow path on the downstream side of the first vaporization unit, and the first vaporization unit.
- a first vaporization supply device including a first supply pressure sensor for measuring a gas pressure between the first valve, a second vaporization section in which raw materials are stored and having a heater, and a downstream side flow of the second vaporization section.
- a second vaporization supply device including a second valve provided on the road, a second supply pressure sensor for measuring a gas pressure between the second vaporization unit and the second valve, and the first vaporization supply device.
- a control circuit connected to the second vaporization supply device is provided, and the downstream flow path of the first vaporization supply device and the downstream flow path of the second vaporization supply device communicate with a common flow path.
- the control circuit controls the opening and closing of the first valve and the second valve so as to temporally shift the opening period of the first valve and the opening period of the second valve, and the first vaporization unit.
- the gas from the second vaporization unit and the gas from the second vaporization unit can be sequentially flowed into the common flow path.
- the first valve when the output of the first supply pressure sensor is equal to or higher than a set value, the first valve is opened from closed to start flowing gas from the first vaporization unit to a common flow path, and the second valve is started.
- the second valve is opened from closed to start flowing gas from the second vaporization unit to the common flow path.
- the second valve is maintained in the closed state during the opening period of the first valve, and the first valve is maintained in the closed state during the opening period of the second valve.
- the opening period of the first valve and the opening period of the second valve are provided with an overlapping period at the time of switching.
- the opening period of the first valve and the opening period of the second valve are provided so as to be alternately repeated.
- the first vaporizing portion and the second vaporizing portion have the same shape and the same volume, and the opening degree when the first valve is opened and the opening degree when the second valve is opened are different. It is the same, and the opening period of the first valve and the opening period of the second valve are the same length.
- the raw material stored in the first vaporization section and the second vaporization section is a liquid organic metal material or a liquid Si 2 Cl 6 .
- a third vaporization section in which raw materials are stored and having a heater, a third valve provided on the downstream side of the third vaporization section, and a gas between the third vaporization section and the third valve.
- a third supply pressure sensor for measuring pressure is provided, and a third vaporization supply device is further provided, which is connected to the control circuit and whose downstream flow path communicates with the common flow path.
- the gas supply method a first vaporization section in which raw materials are stored and having a heater, a first valve provided in a flow path on the downstream side of the first vaporization section, the first vaporization section and the above.
- a first vaporization supply device including a first supply pressure sensor for measuring a gas pressure between the first valve, a second vaporization section in which raw materials are stored and having a heater, and a downstream flow path of the second vaporization section.
- a second vaporization supply device including a second valve provided in the above, a second supply pressure sensor for measuring a gas pressure between the second vaporization unit and the second valve, the first vaporization supply device, and the first vaporization supply device.
- a control circuit connected to the second vaporization supply device is provided, and the downstream flow path of the first vaporization supply device and the downstream flow path of the second vaporization supply device communicate with a common flow path.
- the gas generated by the vaporization supply device can be supplied at a relatively large flow rate.
- the applicant measures and controls the supply amount of the gas generated by the vaporization supply device in a pulsed manner in the international application number PCT / JP2021 / 0111117 (international filing date: March 18, 2021).
- the method is disclosed.
- the vaporization supply device used here does not require a throttle portion, and the gas pressure on the upstream side of the control valve, that is, the pressure of the gas generated in the vaporization portion (hereinafter referred to as “the pressure”). , It may be called supply pressure), and the control valve is controlled based on the measurement result.
- the gas can be supplied without passing through the throttle portion, and the gas can flow at a relatively large flow rate.
- the above-mentioned vaporization supply device can supply gas in a pulsed manner at a relatively large flow rate
- the supply pressure on the upstream side of the control valve continues to decrease while the gas is being supplied, so that one pulse can be supplied.
- the control valve After supplying gas, the control valve must be closed to generate gas to recover the supply pressure, otherwise the gas for the next pulse cannot be supplied. Therefore, the recovery period of the supply pressure after the gas supply is indispensable, and it is difficult to continuously supply the gas generated by the vaporization supply device.
- continuous gas supply is performed by using a plurality of vaporization supply devices connected in parallel to a common flow path connected to the process chamber. It is possible. More specifically, by sequentially opening and closing the control valves of each vaporization supply device by staggering the time, a relatively large flow rate is continuously sent downstream from each vaporization supply device without using a throttle portion. It is configured to be able to supply gas.
- FIG. 1 shows a gas supply system 100 according to an embodiment of the present invention.
- the gas supply system 100 includes a plurality of vaporization supply devices connected in parallel on the upstream side with respect to the common flow path 8 on the downstream side, here, a first vaporization supply device 10A and a second vaporization supply device 10B. ing. Both the first vaporization supply device 10A and the second vaporization supply device 10B are connected to the control circuit 20 (or the control board), and can be operated independently of each other by the control circuit 20.
- control circuit 20 is provided outside the first vaporization supply device 10A and the second vaporization supply device 10B, but the operation control of the first vaporization supply device 10A and the second vaporization supply device 10B is independent. As long as it can be done, it may be provided in any manner.
- the control circuit 20 may be built in, for example, one of the first vaporization supply device 10A and the second vaporization supply device 10B, or may be dispersed in the first vaporization supply device 10A and the second vaporization supply device 10B. It may be arranged. In these cases, the first vaporization supply device 10A and the second vaporization supply device 10B are connected, and the control circuit can control the operation of the first vaporization supply device 10A and the second vaporization supply device 10B. Further, the first vaporization supply device 10A, the second vaporization supply device 10B, and the control circuit 20 may be integrally provided.
- the upstream side of the first vaporization supply device 10A and the second vaporization supply device 10B is connected to, for example, a liquid raw material source 2 which is a liquid raw material contained in a liquid storage tank.
- a liquid raw material source 2 which is a liquid raw material contained in a liquid storage tank.
- the liquid raw material source 2 is commonly connected to both the first vaporization supply device 10A and the second vaporization supply device 10B.
- the liquid raw material source 2 may be individually provided for the first vaporization supply device 10A and the second vaporization supply device 10B.
- HCDS Si 2 Cl 6
- TEOS tetraethyl orthosilicate
- TMGa trimethylgallium
- TMAl trimethylaluminum
- the boiling point of HCDS is about 144 ° C. and the vapor pressure at 190 ° C. is about 250 kPa abs.
- the downstream side of the first vaporization supply device 10A and the second vaporization supply device 10B communicates with the process chamber 4 via the common flow path 8.
- both the gas generated by the first vaporization supply device 10A and the gas generated by the second vaporization supply device 10B can be supplied to the process chamber 4.
- a vacuum pump 6 is connected to the process chamber 4, and the process chamber 4 and the communication flow path can be evacuated.
- FIG. 2 shows a specific configuration of an exemplary vaporization supply device 10 used as the first vaporization supply device 10A and the second vaporization supply device 10B, and is a vertical vaporization supply device also described in Patent Document 3. Is shown.
- the first vaporization supply device 10A and the second vaporization supply device 10B are located downstream of the first and second vaporization units 12A and 12B and the first and second vaporization units 12A and 12B, respectively.
- the first to measure the supply pressure P0 that is, the pressure of the gas generated by the vaporizing portions 12A and 12B) on the upstream side of the first and second valves 14A and 14B provided and the first and second valves 14A and 14B. It also has second supply pressure sensors 16A and 16B.
- first vaporization supply device 10A and the second vaporization supply device 10B of the present embodiment include the first and second liquid replenishment valves 18A and 18B arranged on the upstream side of the first and second vaporization units 12A and 12B. Each has.
- the first vaporization supply device 10A and the second vaporization supply device 10B are simply referred to as the vaporization supply device 10, and the first and second vaporization units 12A and 12B are simply referred to as the vaporization unit 12.
- the first and second valves 14A and 14B are simply referred to as valves 14, the first and second supply pressure sensors 16A and 16B are simply referred to as supply pressure sensors 16, and the first and second liquid replenishment valves 18A and 18B. May be simply referred to as a liquid replenishment valve 18.
- the vaporization unit 12 of the vaporization supply device 10 is provided with a heater 13a (see FIG. 2), and the supplied liquid raw material can be appropriately vaporized by controlling the heater 13a.
- the liquid raw material is vaporized with the valve 14 closed, the raw material is vaporized until the gas pressure (that is, the supply pressure P0 measured by the supply pressure sensor 16) reaches the vapor pressure corresponding to the heater set temperature.
- the gas pressure that is, the supply pressure P0 measured by the supply pressure sensor 16
- the HCDS vaporizes until the supply pressure P0 reaches the vapor pressure of the temperature, about 250 kPa, and then becomes saturated and the supply pressure P0 becomes about 250 kPa. Be maintained.
- the valve 14 is a valve (that is, a control valve) that can be adjusted to an arbitrary opening degree, and the flow rate of the gas generated by the vaporization unit 12 can be controlled by adjusting the opening degree.
- the valve 14 is configured by using, for example, a piezo element drive type valve (sometimes referred to as a piezo valve). By controlling the drive voltage applied to the piezo element, the piezo valve can change the pressing force of the diaphragm valve body 14a (see FIG. 2) against the valve seat, whereby the piezo valve can be opened at an arbitrary opening degree. ..
- the supply pressure sensor 16 provided between the vaporization unit 12 and the valve 14 can measure the supply pressure P0, which is the pressure of the generated gas, and for example, the pressure is measured from the magnitude of the strain generated in the diaphragm.
- a measuring type pressure sensor is used. It is preferable that the valve 14 and the supply pressure sensor 16 can operate without any trouble even in a high temperature environment of 150 ° C to 250 ° C.
- the vaporization supply device 10 may include a preheating unit 11 having a heater (not shown) on the upstream side of the liquid replenishment valve 18.
- the preheating unit 11 is provided to assist the vaporization in the vaporization unit 12, and by preheating the introduced liquid raw material L in the preheating unit 11, the required heat amount in the vaporization unit 12 is reduced. It is possible to suppress the temperature drop during vaporization.
- the heaters include a heater that heats the preheating unit 11 from the side surface, a heater 13a that heats the vaporization unit 12 from the side surface and the bottom surface, and a valve 14 and a flow path on the downstream side from the side surface and the bottom surface.
- a heater 13b is provided.
- the preheating unit 11, the vaporization unit 12, and the valve 14 can be independently heated to an arbitrary temperature. Normally, the heater temperature of the preheating unit 11 is set lower than the heater temperature of the vaporization unit 12, and the heater temperature of the valve 14 is set higher than the heater temperature of the vaporization unit 12.
- the heater provided in each part of the vaporization supply device 10 is composed of a heat transfer member and a heat generating element fixed to the heat transfer member.
- a heat transfer member for example, a thick plate material made of aluminum is used, and as the heat generating element, for example, a cartridge heater is used. In addition to this, a jacket heater can also be used as the heater.
- the preheating unit 11 has a preheating chamber 11a which is an expansion unit from the flow path, and is mainly heated by the heater here.
- the vaporization unit 12 has a plate-shaped vaporization chamber 12a, and the liquid raw material stored in the lower part of the vaporization chamber 12a is vaporized by a heater, and the gas is discharged from the gas outflow passage on the upper surface. ing.
- the vaporization supply device 10 includes a stop valve 17 provided on the downstream side of the valve 14, a purging three-way valve 19a provided between the liquid replenishment valve 18 and the vaporization unit 12, and the vaporization supply device 10.
- a purging three-way valve 19b or the like provided on the downstream side of the stop valve 17 may be provided.
- the stop valve 17 is used to reliably stop the supply of gas from the vaporization supply device 10.
- AOV air driven valve
- the purge three-way valves 19a and 19b are for switching the purge gas to flow, and AOV or the like is preferably used.
- the three-way valve 19a for purging when the valve body is closed, the inlet of the purge gas is closed and the flow path of the liquid raw material communicates, and when the valve body is opened, the inlet of the purge gas opens and communicates with the inside of the vaporization part to allow the purge gas to flow. It will be possible.
- the inlet of the purge gas is closed and the downstream of the stop valve 17 communicates with the process chamber, and when the valve body is opened, the inlet of the purge gas opens and communicates with the process chamber. Will be able to flow.
- the vaporization supply device 10 of the present embodiment shown in FIG. 2 a vertical configuration is adopted as in Patent Document 3. Specifically, the vaporization unit 12 is provided on the preheating unit 11, and the valve 14 and the stop valve 17 are provided on the vaporization unit 12.
- the vaporization supply device 10 is not limited to the above-mentioned vertical configuration, and has a configuration in which the preheating unit, the vaporization unit, and the valve are arranged in a row in the horizontal direction as shown in Patent Document 2 and the like. Is also good.
- the vaporization supply device 10 may be configured in any embodiment as long as it has a vaporization unit, a valve on the downstream side (typically a control valve), and a supply pressure sensor between the vaporization unit and the valve.
- the downstream side of the valve 14 is connected to the stop valve 17 via a normal gasket 22.
- a simple gasket 22 is arranged instead of providing a throttle portion such as an orifice plate, so that a large flow rate of gas can easily flow.
- the flow rate is basically controlled based on the output of the supply pressure sensor 16, but as shown in FIG. 2, a pressure sensor 21 for measuring the pressure on the downstream side of the valve 14 is provided. It may have been.
- the differential pressure between the primary side and the secondary side of the valve 14 can be measured from the output of the supply pressure sensor 16 and the output of the pressure sensor 21, and the flow rate is calculated based on the measured differential pressure. Is also possible.
- the liquid raw material L is supplied from the liquid raw material source 2 to the vaporization unit 12 or the preheating unit 11 of the vaporization supply device 10.
- the liquid raw material L is, for example, pumped by supplying a pressurized inert gas to the liquid storage tank and pushing out the liquid raw material L at a constant pressure.
- the supply amount of the liquid raw material L to the vaporization unit 12 can be adjusted by controlling the opening / closing time of the liquid replenishment valve 18 and the like.
- the raw material gas G is generated by heating the liquid raw material L using a heater.
- the supply pressure P0 rises to the vapor pressure.
- the valve 14 is opened, the raw material gas G can flow to the downstream side of the vaporization supply device 10 via the stop valve 17 in the open state.
- FIG. 3 shows that in the vaporization supply device 10, the valve 14 is operated for a predetermined period (here, 1 second) according to the valve control signal SV based on the set flow rate from the state where the supply pressure P0 is maintained at the vapor pressure (here, 246 kPa abs). It is a graph which shows the change of the supply pressure P0 when opened by one pulse.
- valve 14 When the valve 14 is opened in a pulsed manner according to the valve control signal SV, the gas accumulated in the upstream flows out to the downstream side via the valve 14. At this time, the valve 14 is opened to, for example, the maximum set opening degree (opening corresponding to 100% flow rate setting) according to the valve control signal SV.
- the supply pressure P0 recovers only to, for example, about 230 kPa, and it takes a considerably long time to reach the vapor pressure of 246 kPa after that. It takes. However, if it recovers to this extent, the next gas supply can be performed at a sufficient flow rate. It is needless to say that the above supply pressure P0 is an example and can take various values depending on the initial pressure (vapor pressure), the pulse opening / closing time, or the opening control method of the valve 14. However, it is usually assumed that the amount of gas supplied from the second time onward is smaller than the amount of gas supplied from the first time.
- the opening of the piezo valve at the first opening is set to a slightly smaller opening than the 100% fully opened state, and the opening of the piezo valve at the second and subsequent opening is set. It is conceivable to set the degree to 100%. It is also conceivable to set the opening time of the first piezo valve shorter than the opening time of the second and subsequent piezo valves. Alternatively, it is conceivable to adjust the opening degree and the opening time of the piezo valve at the time of the next pulse gas supply every time according to the magnitude of the supply pressure P0 after the recovery period.
- the vaporization supply device 10 when used alone, it is difficult to continuously supply gas to the process chamber 4, and the gas supply must be pulsed. On the other hand, in the vaporization supply device 10, the amount of gas supplied to the downstream side of the valve 14 can be obtained from the measurement result of the supply pressure P0 when the gas is supplied. Therefore, if it is a pulse supply, it is possible to supply gas with a controlled supply amount.
- the method for obtaining the gas supply amount in the gas supply of one pulse is disclosed in the international application number PCT / JP2021 / 01117 by the present applicant.
- the Cv value is a general index indicating the ease of flow of a fluid in a valve, and corresponds to the flow rate of gas flowing through the valve when the primary side pressure and the secondary side pressure of the valve are constant.
- Gg is the specific gravity of the gas
- P0 is the supply pressure, that is, the primary pressure of the valve (kPa abs)
- T is the fluid temperature (K).
- the Cv value can be expressed using the flow path cross-sectional area A of the valve and the contraction coefficient (contraction ratio) ⁇ , and here, the flow path cross-sectional area A when the piezo valve is opened to the maximum opening degree is defined as the flow path cross-sectional area A.
- A ⁇ DL using a seat diameter D (for example, about 6 mm) and a valve body lift amount L (for example, about 50 ⁇ m)
- the flow rate Q based on the supply pressure P0 can be obtained as described above.
- the gas supply amount (total volume or total substance amount) in one pulse when the valve 14 is opened for a predetermined time is Q (tn) at the time tun (n is a natural number) for each sampling of the supply pressure P0.
- each vaporization supply device 10 can flow gas at a large flow rate or a large supply amount controlled by using the supply pressure sensor 16, so a plurality of these are prepared in sequence. If the gas is supplied to the gas, it is possible to continuously supply the gas at a controlled large flow rate.
- the pulse-like supply operation of the gas from the first vaporization supply device 10A and the pulse-like supply operation of the gas from the second vaporization supply device 10B are alternately repeated.
- a continuous gas supply to the process chamber 4 is performed.
- the control circuit 20 causes the gas from the first vaporization unit 12A and the gas from the second vaporization unit 12B by shifting the pulse release period of the first valve 14A and the pulse release period of the second valve 14B in time. Can be sequentially flowed through the common flow path 8.
- FIG. 4 shows a change in the supply pressure P0A in the first vaporization supply device 10A, an open / close signal CVA of the first valve 14A, a gas flow rate QA flowing downstream of the first valve 14A, and a supply pressure in the second vaporization supply device 10B.
- the change of P0B, the open / close signal CVB of the second valve 14B, and the flow rate QB of the gas flowing downstream of the second valve 14B are shown.
- valves 14A and 14B are first closed and the supply pressures P0A and P0B are maintained at the vapor pressure (246 kPa)
- first only the first valve 14A is used for a predetermined period (here). Then it opens in a pulsed manner for 1 second). At this time, gas flows to the downstream side of the first valve 14A, the supply pressure P0A decreases sharply, and the flow rate QA fluctuates in a chevron waveform having an initial peak as shown in the figure.
- the gas supply amount corresponds to the time integral value of the graph of the flow rate QA.
- the second valve 14B remains closed, and gas is not supplied from the second vaporization supply device 10B. Therefore, during this period, gas is supplied only from the first vaporization supply device 10A.
- the first valve 14A is closed and only the second valve 14B is opened in a pulsed manner for a predetermined period (here, 1 second).
- a predetermined period here, 1 second.
- the gas supply amount corresponds to the time integral value of the graph of the flow rate QB.
- the first valve 14A is kept closed, and gas is not supplied from the first vaporization supply device 10A. Further, the supply pressure P0A, which had dropped to 82 kPa when the first valve 14A was closed, is restored to 230 kPa due to the progress of gas generation in the vaporization unit 12A.
- the second valve 14B is closed and only the first valve 14B is opened again in a pulsed manner for a predetermined period (here, 1 second). Will be.
- a predetermined period here, 1 second.
- the second valve 14B since the second valve 14B is kept closed, the supply pressure P0B, which had dropped to 82 kPa, is restored to 230 kPa due to the progress of gas generation in the vaporization unit 12B.
- FIG. 5 is a diagram showing a time change of the flow rate of the gas supplied to the process chamber 4 by the operation control shown in FIG. As can be seen from FIG. 5, as a result of the gas supply from the first vaporization supply device 10A and the gas supply from the second vaporization supply device 10B being repeatedly performed, the gas is continuously supplied to the process chamber 4.
- the first gas supply amount of the first vaporization supply device 10A and the second vaporization supply device 10B is slightly larger than the gas supply amount of the second and subsequent times.
- the gas supply amount for one pulse can be obtained from the measurement result of the supply pressure P0 that decreases during gas supply. Therefore, it is possible to obtain the gas supply amount even when the first vaporization supply device 10A and the second vaporization supply device 10B alternately supply the gas in a pulsed manner, and the overall gas supply amount is the desired amount.
- the gas can be supplied in a desired amount by adjusting the opening degree and the opening period of the control valve used as the valve 14.
- the control circuit 20 opens the first valve 14A from the closed state to allow gas to flow from the first vaporization unit 12A, and similarly, the second supply pressure.
- the second valve 14B may be configured to open from the closed state to allow gas to flow from the second vaporization unit 12B.
- FIGS. 6 and 7 show the configuration of the gas supply system and the applied valve open / close signal according to another aspect.
- the same reference numerals are given to the same elements as those in the above-described embodiment, and detailed description thereof will be omitted.
- a third vaporization supply device 10C is provided in addition to the first vaporization supply device 10A and the second vaporization supply device 10B.
- the third vaporization supply device 10C also communicates with the common flow path 8, and the first to third vaporization supply devices 10A, 10B, and 10C are connected in parallel.
- the third vaporization supply device 10C also supplies the third vaporization section 12C having a heater, the third valve 14C on the downstream side thereof, and the upstream of the third valve 14C.
- a third supply pressure sensor 16C for measuring the pressure P0 and a third liquid replenishment valve 18C for controlling the supply of the liquid to the third vaporization unit 12C are provided.
- the control circuit 20 is connected to the first to third vaporization supply devices 10A, 10B, and 10C.
- pulsed open / close signals CVA, CVB, and CVC that sequentially open for a predetermined period at different times are provided to the valves 14A, 14B, and 14C.
- a period A1 for opening the first valve 14A is provided, then a period B1 for opening the second valve 14B is provided, and then a period C1 for opening the third valve 14C is provided.
- a period A2 for opening the first valve 14A again is provided, and then a period B2 for opening the second valve 14B again and a period C2 for opening the third valve 14C again are provided.
- gas is continuously supplied to the process chamber 4 at a controlled large flow rate. It is possible.
- lamp control is adopted when each valve 14 is opened, and control is performed in which the target opening degree of the valve (here, the control valve) increases with time. Further, the opening operation of the bulb 14 by this lamp control is executed in duplicate in the final stage of the opening period of the other bulbs. In this case, in the overlapping period OL, a state in which the two valves are open at the same time is realized.
- the opening / closing operation of the valve 14 may be provided with a slight overlapping period.
- the second valve 14B is opened from the closed state at a timing before the end of the predetermined period A1, and then the second valve 14B is set to the predetermined period B1. Only kept open.
- the third valve 14C is changed from the closed state to the open state at the timing before the end of the predetermined period B1, and then the third valve 14C is maintained in the open state for the predetermined period C1.
- the supply pressure P0 continues to decrease during the opening period of each valve, and the flow rate Q at that time also gradually decreases after reaching the peak flow rate. That is, just before the end of the opening period, the supply pressure P0 and the flow rate Q are lower than the initial ones. Therefore, if the control of opening the other valves little by little is performed at the same time as described above, the decrease of the supply pressure P0 and the flow rate Q can be suppressed as a whole. Therefore, it is possible to control the flow rate to change more stably.
- the valve opening control at the time of starting the flow rate is not limited to the above-mentioned lamp control, and various controls such as a control in which the target value increases quadraticly or exponentially can be adopted. Further, it is also possible to adopt a control in which the target opening degree decreases with time at the time of the flow rate decrease as well as at the time of the flow rate increase.
- the timing for starting the opening of the second valve is set in consideration of the output flow rate of the first vaporization supply device.
- the opening period of the first valve and the second valve is not completely switched, and even if a slight overlapping period is included as described above, the first valve is opened and the first valve is opened. It may be expressed that the operation of flowing the gas from the vaporizing unit for a predetermined period is set by shifting the operation backward from the operation of flowing the gas from the vaporizing unit for a predetermined period by opening the second valve.
- the control signal given to each valve may be corrected at any time based on the gas supply amount measured by using the supply pressure sensor.
- the valve 14 is opened and closed based on a predetermined pulse flow rate control signal (valve open / close command), and 1 pulse is measured by the above gas supply amount measurement method. The amount of gas supplied for each minute is measured. Then, when the measured gas supply amount has a significant difference from the desired set gas supply amount, the pulse flow rate control signal is corrected from the next one pulse gas supply, and the valve 14 is opened and closed from the next time onward. Control the operation.
- the measured gas supply is greater than the preset desired amount, then at least one of the valve 14 opening time and the valve 14 opening is smaller, depending on the magnitude. Set to a value. As a result, the amount of gas supplied in the next 1-pulse gas supply can be reduced, and the gas can be supplied in a desired amount.
- the measured gas supply amount is smaller than the desired amount, at least one of the valve opening time and the valve opening degree is set to a larger value. As a result, the amount of gas supplied in the next 1-pulse gas supply can be increased, and the gas can be supplied in a desired amount.
- valve 14 By using a control valve that can be adjusted to an arbitrary opening as the valve 14 as described above and arbitrarily setting the opening at the opening time of the control valve, it is easy to control the overall flow rate and finely adjust the flow rate. Benefits are obtained. However, in applications where fine adjustment of the flow rate by adjusting the opening degree is not required, an on / off valve having only an opening / closing function can be used as the valve 14.
- the explanation is made on the premise that the liquid replenishment valve 18 is closed during the gas supply period, but as the gas supply progresses, the liquid raw material inside the vaporization unit 12 is consumed. Therefore, if the liquid is not replenished, the supply pressure P0 will not return to a sufficient level even in the same recovery period. Therefore, the supply pressure P0 is monitored, and for example, when the supply pressure P0 after the recovery period falls below the set threshold value, the liquid replenishment valve 18 is opened for a predetermined period to replenish the vaporization unit 12 with the liquid raw material. It is also conceivable to replenish the liquid raw material based on the value of the liquid level gauge provided in the vaporization unit 12 and the amount of gas supplied.
- the gas supply system is configured by using four or more vaporization supply devices. Of course, it is also good.
- the gas supply system according to the embodiment of the present invention is suitably used for continuously supplying the gas used in the semiconductor manufacturing process at a relatively large flow rate.
- Vacuum pump 8 Common flow path 10 Vaporization supply device 10A 1st vaporization supply device 10B 2nd vaporization supply device 12 Vaporization section 12A 1st vaporization section 12B 2nd vaporization section 14 valve 14A 1st valve 14B 2nd valve 16 Supply pressure sensor 16A 1st supply pressure sensor 16B 2nd supply pressure sensor 18 Liquid replenishment valve 18A 1st liquid replenishment valve 18B 2nd liquid replenishment valve 20 Control circuit 100 Gas supply system
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Abstract
Description
4 プロセスチャンバ
6 真空ポンプ
8 共通流路
10 気化供給装置
10A 第1気化供給装置
10B 第2気化供給装置
12 気化部
12A 第1気化部
12B 第2気化部
14 バルブ
14A 第1バルブ
14B 第2バルブ
16 供給圧力センサ
16A 第1供給圧力センサ
16B 第2供給圧力センサ
18 液体補充弁
18A 第1液体補充弁
18B 第2液体補充弁
20 制御回路
100 ガス供給システム
Claims (9)
- 原料が貯留されヒータを有する第1気化部と、前記第1気化部の下流側流路に設けられた第1バルブと、前記第1気化部と前記第1バルブとの間のガス圧力を測定する第1供給圧力センサとを備える第1気化供給装置と、
原料が貯留されヒータを有する第2気化部と、前記第2気化部の下流側流路に設けられた第2バルブと、前記第2気化部と前記第2バルブとの間のガス圧力を測定する第2供給圧力センサとを備える第2気化供給装置と、
前記第1気化供給装置および前記第2気化供給装置と接続された制御回路と
を備え、前記第1気化供給装置の下流側流路と前記第2気化供給装置の下流側流路とが共通の流路に連通しているガス供給システムであって、
前記制御回路は、前記第1バルブの開放期間と前記第2バルブの開放期間とを時間的にずらすように前記第1バルブおよび前記第2バルブの開閉を制御し、前記第1気化部からのガスと前記第2気化部からのガスとを前記共通の流路に順次的に流すことができるように構成されている、ガス供給システム。 - 前記第1供給圧力センサの出力が設定値以上のときに前記第1バルブを閉から開にして前記第1気化部から共通の流路へのガスを流し始め、前記第2供給圧力センサの出力が設定値以上のときに前記第2バルブを閉から開にして前記第2気化部から共通の流路へのガスを流し始めるように構成されている、請求項1に記載のガス供給システム。
- 前記第1バルブの開放期間において、前記第2バルブは閉状態に維持され、前記第2バルブの開放期間において、前記第1バルブは閉状態に維持される、請求項2に記載のガス供給システム。
- 前記第1バルブの開放期間と前記第2バルブの開放期間とにおいて、切り替え時の重複期間が設けられている、請求項2に記載のガス供給システム。
- 前記第1バルブの開放期間と前記第2バルブの開放期間とが交互に繰り返すように設けられる、請求項1から4のいずれかに記載のガス供給システム。
- 前記第1気化部と前記第2気化部が同一の形状かつ同一の容積であり、前記第1バルブの開放時の開度と前記第2バルブの開放時の開度とが同一であり、前記第1バルブの開放期間と前記第2バルブの開放期間とが同じ長さである請求項1から5のいずれかに記載のガス供給システム。
- 前記第1気化部および前記第2気化部に貯留される原料は、液体の有機金属材料または液体のSi2Cl6である、請求項1から6のいずれかに記載のガス供給システム。
- 原料が貯留されヒータを有する第3気化部と、前記第3気化部の下流側に設けられた第3バルブと、前記第3気化部と前記第3バルブとの間のガス圧力を測定する第3供給圧力センサとを備え、前記制御回路に接続されるとともに、その下流側流路が前記共通の流路に連通する第3気化供給装置をさらに備え、
前記制御回路は、前記第1バルブの開放期間と前記第2バルブの開放期間と前記第3バルブの開放期間とを時間的にずらすことによって、前記第1気化部からのガスと前記第2気化部からのガスと前記第3気化部からのガスとを前記共通の流路に順次的に流すことができるように構成されている、請求項1に記載のガス供給システム。 - 原料が貯留されヒータを有する第1気化部と、前記第1気化部の下流側流路に設けられた第1バルブと、前記第1気化部と前記第1バルブとの間のガス圧力を測定する第1供給圧力センサとを備える第1気化供給装置と、
原料が貯留されヒータを有する第2気化部と、前記第2気化部の下流側流路に設けられた第2バルブと、前記第2気化部と前記第2バルブとの間のガス圧力を測定する第2供給圧力センサとを備える第2気化供給装置と、
前記第1気化供給装置および前記第2気化供給装置に接続された制御回路と
を備え、前記第1気化供給装置の下流側流路と前記第2気化供給装置の下流側流路とが共通の流路に連通しているガス供給システムにおいて実行されるガス供給方法であって、
前記第1バルブを閉から開にした後、所定時間後に前記第1バルブを開から閉にするステップと、
前記第1バルブを開から閉にするのと同時に前記第2バルブを閉から開にした後、所定時間後に前記第2バルブを開から閉にするステップと、
前記第2バルブを開から閉にするのと同時に前記第1バルブを閉から開にした後、所定時間後に前記第1バルブを開から閉にするステップと
を含むガス供給方法。
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JPS60188695A (ja) * | 1984-03-03 | 1985-09-26 | Hitachi Zosen C B I Kk | 低温液化ガス気化設備における気化装置 |
JP2010153757A (ja) * | 2008-12-26 | 2010-07-08 | Mitsui Eng & Shipbuild Co Ltd | 原子層成長装置 |
JP2016211021A (ja) * | 2015-04-30 | 2016-12-15 | 株式会社フジキン | 気化供給装置 |
JP2019178691A (ja) * | 2018-03-30 | 2019-10-17 | 大阪瓦斯株式会社 | 空温式の液化天然ガス気化装置 |
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US7076970B2 (en) * | 2004-01-19 | 2006-07-18 | Air Products And Chemicals, Inc. | System for supply and delivery of carbon dioxide with different purity requirements |
US9934956B2 (en) * | 2015-07-27 | 2018-04-03 | Lam Research Corporation | Time multiplexed chemical delivery system |
US20200149162A1 (en) | 2017-07-25 | 2020-05-14 | Fujikin Incorporated | Fluid control device |
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JPS60188695A (ja) * | 1984-03-03 | 1985-09-26 | Hitachi Zosen C B I Kk | 低温液化ガス気化設備における気化装置 |
JP2010153757A (ja) * | 2008-12-26 | 2010-07-08 | Mitsui Eng & Shipbuild Co Ltd | 原子層成長装置 |
JP2016211021A (ja) * | 2015-04-30 | 2016-12-15 | 株式会社フジキン | 気化供給装置 |
JP2019178691A (ja) * | 2018-03-30 | 2019-10-17 | 大阪瓦斯株式会社 | 空温式の液化天然ガス気化装置 |
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