WO2015046455A1 - フィルタユニットの前処理方法、処理液供給装置、フィルタユニットの加熱装置及び処理液供給路の前処理方法 - Google Patents
フィルタユニットの前処理方法、処理液供給装置、フィルタユニットの加熱装置及び処理液供給路の前処理方法 Download PDFInfo
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- WO2015046455A1 WO2015046455A1 PCT/JP2014/075692 JP2014075692W WO2015046455A1 WO 2015046455 A1 WO2015046455 A1 WO 2015046455A1 JP 2014075692 W JP2014075692 W JP 2014075692W WO 2015046455 A1 WO2015046455 A1 WO 2015046455A1
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- Prior art keywords
- solvent
- filter unit
- pretreatment
- liquid supply
- treatment liquid
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/18—Heating or cooling the filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02299—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer pre-treatment
- H01L21/02307—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer pre-treatment treatment by exposure to a liquid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67028—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like
- H01L21/6704—Apparatus for fluid treatment for cleaning followed by drying, rinsing, stripping, blasting or the like for wet cleaning or washing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67126—Apparatus for sealing, encapsulating, glassing, decapsulating or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/6715—Apparatus for applying a liquid, a resin, an ink or the like
Definitions
- the present invention provides a processing liquid supply path and a filter unit provided in the processing liquid supply path in order to prevent the generation of foreign substances that may be contained in the processing liquid containing a solvent for performing liquid processing on the object to be processed. It relates to pre-processing technology.
- a process of supplying a processing liquid onto a substrate and performing liquid processing is performed by discharging the processing liquid sent from the processing liquid tank through the supply path onto the substrate.
- a filter unit is provided in the processing liquid supply path in order to remove foreign substances contained in the processing liquid in the processing liquid tank or foreign substances caused by piping and supply equipment.
- the filtration performance of the filter unit (the cleanliness of the liquid flowing out of the filter) is not stable, and normal processing is performed. I can't do it. For this reason, after the filter unit is attached, pre-treatment such as repeated dummy dispensing or circulating the solvent for a long time is performed until the filtration performance of the filter unit is stabilized. Further, even after the processing by the new filter unit is started, the filtration performance of the filter unit is lowered, and the work such as dummy dispensing is still necessary.
- the resist solution supply path be cleaned when a new resist solution supply device is installed or when the type of resist solution used in the resist solution supply device is changed. Therefore, for example, pure water is filled in the pipe and left for a predetermined time. However, this cleaning process takes a long time, and the amount of cleaning liquid used is also large. In addition, as circuit patterns become more complex, it is also required to increase the cleanliness of the resist solution by removing organic substances adhering to the wetted parts in the pipes and supply devices, and to eliminate the cause of yield reduction. ing.
- Patent Document 1 describes a technique for changing the temperature of the filter unit in the substrate processing apparatus to reduce the adsorption of foreign matter to the filter unit, but the problem to be solved is different from the technique disclosed below. .
- One object of the present invention is to supply a processing liquid containing a solvent to a target object through a filter unit provided in the processing liquid supply path, and to perform the liquid processing, the contamination of the target object due to the filter unit.
- An object of the present invention is to provide a technique capable of suppressing the waiting time caused by the preprocessing of the filter unit.
- Another object of the present invention is to suppress contamination of a target object caused by organic substances in the processing liquid supply path by preprocessing the processing liquid supply path when supplying the processing liquid to the target object for liquid processing. At the same time, it is to provide a technique capable of promptly performing the pretreatment.
- a pre-processing method for a filter unit characterized by being high is provided.
- a processing liquid supply apparatus for liquid processing includes: a processing liquid supply apparatus that supplies a processing liquid containing a solvent for liquid processing a target object to the target object;
- a treatment liquid discharge part for discharging treatment liquid to the body is provided on one end side thereof, a treatment liquid supply path to which a treatment liquid supply source is connected to the other end side, and the foreign matter in the treatment liquid to remove foreign substances
- a pre-treatment solvent comprising: a filter unit having a filter portion made of a resin, provided in a treatment liquid supply path; and a pre-treatment mechanism that forms a state in which the filter portion is immersed in a pre-treatment solvent.
- treatment liquid supply apparatus wherein the solubility of the resin constituting the filter unit of the filter unit is higher than the solubility of the resin in the solvent used in the treatment liquid.
- treatment liquid containing a solvent includes both cases where 100% of the treatment liquid is composed of a solvent and cases where the treatment liquid is composed of a mixture of a solvent and another component such as a coating film component. .
- a heating apparatus that heats a filter unit provided in a processing liquid supply path in order to remove foreign substances contained in a processing liquid containing a solvent for liquid processing a target object.
- a heating unit for heating the main body including a first storage unit for storing a first reactant, and the heating unit for heating the main body.
- a second container isolated from the first container for accommodating a second reactant that causes an exothermic reaction upon contact with the first reactant; a first reactant and a second
- a heating device for a filter unit comprising: an isolation release unit that releases an isolation state from a reactant and contacts the both.
- a step of supplying a pretreatment solvent to the treatment liquid supply path, and then a step of discharging the pretreatment solvent from the treatment liquid supply path, and the solubility of the organic matter in the pretreatment solvent is higher than that of the treatment liquid supply path.
- the processing liquid in a processing liquid supply apparatus that supplies a processing liquid containing a solvent for liquid processing a target object to the target object, the processing liquid is discharged to the target object.
- a processing liquid supply path in which a processing liquid discharge part is provided on one end side and a processing liquid supply source is connected to the other end side, and a preprocessing mechanism for supplying a pretreatment solvent into the processing liquid supply path And the solubility of the organic substance with respect to the solvent for the said pretreatment is higher than the solubility of the said organic substance with respect to the solvent contained in the said processing liquid,
- the processing liquid supply apparatus characterized by the above-mentioned is provided.
- the components that can be eluted from the resin constituting the filter unit during the liquid treatment are actively eluted before the liquid treatment, so that the treatment liquid stays in the filter unit for a long time.
- the resin can be prevented from eluting into the treatment liquid, for example, the next liquid treatment can be started as it is.
- organic substances adhering to the pretreatment supply path can be removed with a pretreatment solvent at a high removal rate, and the pretreatment is performed in a short time. Can do.
- FIG. 1 is a diagram showing the entire piping system of a solvent supply apparatus which is one embodiment of a processing liquid supply apparatus of the present invention.
- This solvent supply apparatus includes a solvent supply source 21 including a solvent bottle, a liquid end tank 23, a filter unit 3, a first trap 24, a pump 25, a second trap 26, a dispense valve 27, and a nozzle 13 from the upstream side.
- a solvent supply path 1 which is a pipe.
- V11 to V25 are valves
- 10 is a liquid processing unit.
- the filter unit 3 is for removing foreign substances (particles) in the solvent
- the first trap 24 and the second trap 26 are for removing bubbles in the solvent.
- the solvent corresponds to the treatment liquid.
- the liquid processing unit 10 includes a spin chuck 11 that holds an object to be processed, such as a wafer W, and a cup module 12 that is provided around the spin chuck 11.
- the solvent from the nozzle 13 is supplied to, for example, the rotation center of the wafer W and spread over the entire surface of the wafer W, so that the entire surface of the wafer W is wetted with the solvent.
- a resist solution is supplied to the wafer W supplied with the solvent by another nozzle (not shown), and a resist solution film is formed by a spin coating method.
- the solvent is used in a pre-wet process, which is a liquid process that wets the wafer W in advance so that the resist liquid spreads uniformly on the wafer W.
- a mechanism portion 2 that performs a wetting process in which a solvent is soaked into a filter unit 31 in a newly attached filter unit 3 so that no bubbles remain in the filter unit 31.
- a mechanism portion 4 that performs pretreatment for forcibly dissolving a part of the resin constituting the filter portion 31.
- the mechanism portion 2 includes a trap tank 28 whose bottom is connected to a vent port 333 of the filter unit 31 via a valve V18, and a valve V19 on a branch path of a supply path connected to an outlet 332 of the filter unit 31.
- a trap tank 29 having a bottom portion connected thereto, and exhaust passages 201 and 202 connected to the upper surfaces of the trap tanks 28 and 29, respectively. Drain paths 203 and 204 are connected to the bottoms of the trap tanks 28 and 29, respectively.
- the wetting process is performed as follows. First, the dried filter unit 3 is attached to the solvent supply path 1 in a state where the valves are closed. Then, the valves V11, V12, V14, V18, V21 are opened, the path from the solvent supply source 21 to the drainage path through the liquid end tank 23, the filter unit 3, and the trap tank 28 is opened, and the solvent supply source The inside of 21 is pressurized with N 2 to send out the solvent, and the inside of the filter unit 3 is filled with the solvent.
- the valve V18 to open the valve V19, V22, and the solvent supply source 21 is pressurized by N 2
- the solvent is circulated from the filter unit 3 to the trap tank 29.
- valves V23 and V24 are opened, and exhaust is performed from the exhaust paths 201 and 202 of the trap tanks 28 and 29.
- the pressure inside the filter unit 3 is reduced, and the gas dissolved in the solvent inside the filter unit 3 becomes bubbles and elutes into the solvent.
- the solvent containing the bubbles is collected in the first trap 24 by opening the valves V15 and V20, and drained from the drainage path 205.
- the dispense valve 27 is opened and the pump 25 is driven, so that the solvent (processing) from the nozzle 13 to the liquid processing unit 10 is performed. Supply).
- the filter unit 3 includes a filter unit 31, an outer case 32, and an inner case 34.
- the filter unit 31 is made of a sheet material formed by attaching a net-like support material made of high-density polyethylene (HDPE) to both surfaces of a planar filter body portion made of ultra-high molecular weight polyethylene (UPE). After being folded into a shape, it is wound into a cylindrical shape.
- HDPE high-density polyethylene
- UPE ultra-high molecular weight polyethylene
- the inner case 34 includes concentric outer cylinders and inner cylinders, and a plurality of liquid passage openings are opened in these outer cylinders and inner cylinders.
- the sheet material (filter part 31) wound in a cylindrical shape is fitted in the annular space between the outer cylinder and the inner cylinder.
- a flow opening is provided on the peripheral surface between the outer case 32 and the inner case 34, and the solvent flows therethrough.
- a heat generating cover body 41 is set so as to surround the lower portion of the outer case 32.
- the heat generating cover body 41 is made of a highly heat conductive material such as aluminum, and the inside is formed hollow.
- the inside of the heat generating cover body 41 has a two-layer structure divided by a planar sealing body 42 made of, for example, polyethylene.
- a planar sealing body 42 made of, for example, polyethylene.
- water (H 2 O) and a lower layer (first 1 storage portion) 44 stores, for example, calcium carbonate (CaO).
- the combination of substances to be stored is not limited to H 2 O and CaO as long as the pretreatment described later is effectively performed by the heat generated by the reaction between the substance of the upper layer 43 and the substance of the lower layer 44 and the solvent does not boil.
- a needle-shaped seal cutter 45 for breaking the seal body 42 is inserted into the heat generating cover body 41 from above.
- a stopper 46 is fitted into the upper portion of the seal cutter 45 to prevent the seal cutter 45 from breaking the seal body 42 except when necessary.
- the solvent supply apparatus described above is controlled by the control unit 100.
- the control unit 100 includes a CPU, a main memory, a bus, and the like, and is controlled by a program in which commands (each step) are set so as to execute control of each part and perform predetermined processing.
- This program is stored in a storage unit such as a computer storage medium, for example, a flexible disk, a compact disk, a hard disk, or an MO (magneto-optical disk) and installed in the main memory.
- the programs installed in the main memory include programs for controlling the spin chuck 11, the N 2 gas supply source 22, the valves V11 to V25, the filter unit 3, and the like, which are read by the CPU. The respective parts are controlled.
- step S1 After connecting a new filter unit 3 fitted in the heat generating cover body 41 to the solvent supply path 1, the filter unit 31 is wetted as described above, and the filter unit 31 is infiltrated with the solvent, so that the filter unit It is set as the state where a bubble does not remain in 31 (step S1).
- the wetting process may be performed manually by an operator using an operation panel that forms a part of the control unit 100.
- a program in which the sequence of the wetting process is set is stored in the memory of the control unit 100. This program may be executed in advance.
- a pretreatment for positively eluting components that can be eluted in the solvent from the resin constituting the filter unit 31 of the filter unit 3 is performed.
- the operator removes the stopper 46, pushes the seal cutter 45 into the interior, and breaks the seal body 42, thereby causing the H 2 O layer 43 and the CaO layer 44 to react with each other to cause the heat generating cover body 41 to generate heat (Ste S2).
- the filter unit 3 is heated to 60 ° C., for example, and the filter unit 3 is left in the heated state for 2 hours, for example (step S3).
- valve V18 communicating with the vent port 333 is opened, and the inside of the filter unit 3 is purged with a solvent (step S4).
- the valve V19 communicating with the outlet 332 is further opened, and the inside of the filter unit 3 is again purged with a solvent (step S5).
- step S6 the solvent in the filter unit 3 is discharged from the outlet 332 (step S6).
- a series of steps from step S4 to step S6 is repeated a certain number of times, for example, twice.
- the filter unit 3 is heated to the 60 ° C. until the repetition is completed.
- a new solvent as a treatment liquid is injected from the solvent supply source 21 into the solvent supply path 1 (step S7), and a standby state for the liquid treatment is entered.
- the heating temperature of the filter unit 3 is 60 ° C., but the heating temperature is not limited to this, and is within a temperature range that is 23 ° C. or more at room temperature and the filter portion 31 does not deteriorate. Good.
- the subsequent process may be performed while the heat generation cover body 41 is attached to the filter unit 3, or the heat generation cover body 41 may be removed.
- the amount of H 2 O and CaO filled in the heat generating cover body 41 may be adjusted so that heat is generated only for the time required for the pretreatment.
- the temperature of the filter unit 3 is The temperature is lowered to the ambient temperature. Therefore, when the liquid processing on the substrate is not affected by the temperature of the solvent, the liquid processing may be performed with the solvent without removing the heat generating cover body 41 after completion of the preprocessing.
- the heat generating cover 41 is removed from the filter unit 3 after the pretreatment, and the temperature control of the liquid treatment solvent (for example, It is desirable to increase the temperature.
- the liquid processing is performed on the wafer W using the solvent supply device.
- the liquid treatment for example, 0.1 mL of the solvent is discharged onto the wafer W by pressurization by the pump unit 25, and the solvent is applied to the wafer W by a spin coating method.
- the filter unit 31 of the filter unit 3 includes a filter main body portion made of UPE and a support material made of HDPE that supports the filter main body portion from both sides.
- FIG. 5 shows the molecular weight distribution of UPE and HDPE. From FIG. 5, the peak of the molecular weight of UPE is about 4.5 million, while the peak of the molecular weight of HDPE is about 100,000, and the molecular weight distributions of the two hardly overlap each other.
- the above-described problem that particles in the liquid increase when the solvent is retained in the filter unit 3 is a part surrounded by a dotted square in FIG. 5 among the components of HDPE constituting the support material of the filter unit 31. That is, it is presumed that the low density polyethylene, which is a low molecular component of HDPE, is eluted in the solvent. Therefore, in the embodiment of the present invention, the heated solvent is brought into contact with the filter unit 31 when the filter unit 3 is attached to the solvent supply path 1.
- the heated solvent corresponds to a pretreatment solvent, and the solubility of the resin to be removed in the heated solvent is greater than the solubility in the solvent used in the liquid treatment. 31 low molecular weight components can be positively eluted.
- the solvent supplied into the filter unit 3 is heated, so that the low density polyethylene is eluted in the heated solvent. That is, it can be said that the heat generating cover body 41 is a forced dissolution mechanism for polyethylene.
- the heating of the filter unit 3 is started after the solvent is passed through the filter unit 3. However, the heating of the filter unit 3 is started first, and then the filter unit 3 is passed through. May be. Further, as shown in a second embodiment to be described later, the piping of the filter unit 3 may be preheated with a ribbon heater or the like.
- the second embodiment relates to a method of performing the above-described pretreatment using the dedicated pretreatment device 5 shown in FIG. 6 for the new filter unit 3 before being attached to the treatment liquid supply device.
- a solvent supply path 501 is inserted into the bottle 21 a storing the solvent, and an inlet 331 of the filter unit 3 is connected to the solvent supply path 501.
- a solvent discharge path 503 is connected to the outlet 332 of the filter unit 3, and a vent pipe 502 is connected to the vent port 333 of the filter unit 3.
- the vent pipe 502 and the solvent discharge path 503 merge to form a solvent discharge path 504.
- V12, V51, and V52 are valves
- 21a is a solvent supply source
- 22a is an N 2 gas supply source.
- the filter unit 3 is immersed in the liquid tank 51, and the liquid tank 51 is filled with hot water heated by the heater 53.
- FIG. 6 shows a state in which the filter unit 3 is attached to the pretreatment device 5.
- the new filter unit 3 is attached to the solvent supply path 1 of, for example, the solvent supply apparatus (the heat generating cover body 41 is not used) shown in FIG. 1, and is subjected to a wetting process as described above.
- the filter unit 3 is attached to the pretreatment device 5, immersed in the liquid tank 51, and the filter unit 3 is allowed to stand for a predetermined time to heat the solvent in the filter unit 3.
- FIG. 7 shows lifting mechanisms 52 and 54 for immersing the filter unit 3 in the liquid tank 51.
- the filter unit 3 that has completed the pretreatment described above is removed from the pretreatment device 5 and is attached again to the solvent supply path 1 of the solvent supply device of the first embodiment, and then the liquid processing on the wafer W is performed.
- the method of the second embodiment is effective when, for example, it is necessary to avoid fire or high temperature in the processing liquid supply apparatus, and also when temperature or time control is necessary in the pretreatment for the filter unit 3. It is advantageous.
- the filter unit 3 is heated, the solvent that has not been heated flows into the filter unit 3 and the temperature in the filter unit 3 is lowered to prevent the eluate from solidifying and reprecipitating.
- a part of the pipe 501 (the pipe on the upstream side of the filter unit 3) may be immersed in the liquid tank 51 as shown in FIG. Further, instead of immersing the pipe 501 in the liquid tank 51, the solvent flowing into the filter unit 3 may be heated by heating the pipe 501 with a ribbon heater or the like to prevent reprecipitation of the eluate.
- a solvent supply apparatus according to a third embodiment of the treatment liquid supply apparatus of the present invention will be described with reference to FIG. About the same component as the solvent supply apparatus which concerns on 1st Embodiment, the same code
- the configuration downstream of the valve V14 in the solvent supply device according to the third embodiment is the configuration of the solvent supply device according to the first embodiment except that the mechanism portion 4 having the heat generating cover body 41 is not provided. Is the same.
- the solvent supply path 105 is branched into two branch paths (101 + 102; 103 + 104) via the switching valve V26 on the upstream side of the valve V14 of the solvent supply path 105 in which the filter unit 3 is interposed.
- One branch passage is provided with an N 2 gas supply source 22, a first solvent supply source 21, and a liquid end tank 23 in order from the upstream side.
- an N 2 gas supply source 62, a second solvent supply source 61, and a liquid end tank 63 are sequentially provided from the upstream side.
- a new filter unit 3 is attached to the solvent supply device at the time of start-up or maintenance of the solvent supply device.
- the switching valve V26 is switched to the bottle 61 side, and the wetting process is performed using the second solvent in the procedure described in the first embodiment.
- the filter unit 3 that has been subjected to the wetting process is subsequently pretreated with the second solvent.
- the third embodiment is different from the first embodiment in that the heat generating cover body 41 used in the first embodiment does not exist, and thus the pretreatment is performed without heating the filter unit 3.
- liquid processing is performed on the wafer W. Specifically, switching the switching valve V26 to the bottle 21 side, from the first solvent supply source 21 into the solvent supply passage 1a by pumping from the N 2 gas supply source 22 and N 2 gas into the bottle 21 first Supply the solvent. Then, the first solvent is discharged from the nozzle 13 onto the wafer W by pressurization by the pump unit 25, and a liquid film is formed on the wafer W by spin coating.
- the first solvent is a liquid processing solvent, that is, a processing liquid.
- the second solvent is a pretreatment solvent and is a solvent in which the solubility of polyethylene (which constitutes the filter portion) in the second solvent is higher than the solubility of polyethylene in the first solvent.
- Hansen's solubility parameter is known as one of the indexes representing the properties of the solvent.
- HSP is a multidimensional vector (composite vector 200) composed of a dispersion term dD, a polarization term (polarity term) dP and a hydrogen bond term dH as shown in FIG.
- the dispersion term corresponds to the energy derived from van der Waalska between molecules
- the polarization term corresponds to the energy derived from the intermolecular polar force
- the hydrogen bond term corresponds to the energy derived from the intermolecular hydrogen bonding force.
- the value of each term is uniquely determined if the molecular structure of the substance (solvent) is specified.
- FIG. 11 is a graph showing the difference from polyethylene in terms of the size of the polarization term and the size of the hydrogen bond term among the Hansen solubility parameters for each solvent. For each term, the closer the difference is to 0, the more similar the properties are to that of polyethylene. Therefore, the more the solvent is plotted closer to the origin of the graph, the higher the solubility of polyethylene in that solvent.
- the treatment liquid is not limited to a solvent (100% solvent) but may be a resist liquid.
- a solvent (first solvent) contained in the resist solution for example, propylene glycol monomethyl ether acetate (PGMEA), propylene glycol monomethyl ether (PGME), or a mixed solvent thereof is used.
- solvents contained in the processing liquid for liquid processing correspond to “solvents contained in the processing liquid for liquid processing”.
- Solvents that dissolve polyethylene better than these solvents that is, solvents whose plots are closer to the origin than PGMEA and PGME in FIG. 11, such as decalin, cyclohexanone, and n-butylamine, are suitable as the second solvent in the third embodiment. It can be said that
- the solubility of the resin constituting the filter portion of the filter unit, here, polyethylene is higher than that of “solvent contained in the processing liquid for liquid processing” used when liquid processing is performed on the object to be processed.
- a solvent is used as a pretreatment solvent.
- a heated liquid processing solvent is used as the preprocessing solvent.
- the object to be dissolved is dissolved better than the solvent contained in the treatment liquid for liquid treatment at the same temperature, and a solvent different in type from the solvent is used for pretreatment. It is used as a solvent. That is, it can be said that the second solvent supply mechanism is a forced dissolution mechanism for polyethylene.
- a pretreatment apparatus using ultrasonic waves as shown in FIG. 12 may be used.
- 7 is a pretreatment device using ultrasonic waves according to the fourth embodiment
- the container 72 is a container for housing the filter unit 3, and a liquid that is an ultrasonic propagation medium in the container 72, For example, it is filled with water.
- Reference numeral 71 denotes an ultrasonic wave generator.
- the low molecular components inside the filter unit 3 are dissolved in the solvent by the ultrasonic waves applied from the ultrasonic wave generation unit 71. By applying ultrasonic waves to the solvent for liquid treatment, the solubility of the low molecular weight component is increased.
- the solvent to which ultrasonic waves are applied corresponds to the pretreatment solvent.
- preprocessing is performed according to the flow shown in FIG. 4 while applying ultrasonic waves.
- the same effects as those of the above-described embodiments can be obtained.
- the pretreatment device 7 may be incorporated in the solvent supply device described above, or may be a separate device independent of the solvent supply device.
- the filter unit is positively eluted in the pretreatment solvent.
- the filter unit 31 of the filter unit 3 may be made of a material that does not easily dissolve in the solvent.
- the support member of the filter unit 31 may be made of a material that is hardly soluble in an organic solvent and is water-soluble, such as a silicon resin.
- the treatment liquid is not limited to a solvent in which 100% of the component is a solvent, and may be, for example, a solution obtained by dissolving a coating film constituent component such as a resist or a precursor of an insulating film in a solvent.
- the solvent contained in the treatment liquid corresponds to a solvent that is a solvent dissolving a resist or a precursor of an insulating film.
- the solvent used in the pretreatment is 100% of the component, but is not limited to this.
- the solvent is a heated solution having the same components as the treatment solution containing the solvent. There may be.
- FIG. 13 is a view showing a resist solution supply apparatus which is a fifth embodiment of the process liquid supply apparatus of the present invention.
- the configuration relating to the solvent supply source 21 and the liquid end tank 23 is a configuration for supplying a solvent as a processing liquid.
- the solvent supply source and the liquid end tank are indicated by the same reference numerals as in FIG. 1, but the solvent supplied from here is not for liquid treatment but for pretreatment. This is a solvent for cleaning the inside of the pipe.
- Reference numerals 301 and 303 are assigned to a supply source (resist solution bottle) and a liquid end tank (buffer tank) of a resist solution as a processing solution, respectively.
- Reference numeral 302 denotes an N 2 gas supply source, and V301 to V304 denote valves. Further, since the resist solution supply path has the same configuration as the solvent supply path 1 in the first to fourth embodiments, it is denoted by the same reference numeral 1 for convenience of explanation.
- the fifth embodiment relates to a configuration for cleaning and removing organic substances, which are foreign matters adhering to a liquid contact portion of a supply device part such as a valve or a valve as a resist solution supply path 1, with a solvent.
- the heat generating cover body 41 that covers the filter unit 3 provided in the first embodiment is not provided.
- a jacket heater 71 is attached to the liquid end tank 23, and a temperature detection unit S 1 is provided inside the liquid end tank 23.
- the control unit 100 includes a program for performing a cleaning process using a solvent, which will be described later in the description of the operation, and the program includes a group of steps so that the operation described later is performed. In the apparatus according to the embodiments described below, a similar control unit 100 is provided.
- Cleaning of the resist solution supply path 1 is performed, for example, when a new resist solution supply device is incorporated in the liquid processing device, or when the resist solution is replaced with a resist solution of a different type.
- the valve V302 interposed between the resist solution supply source 301 and the buffer tank 303 closed the liquid end tank 23, the buffer tank 303, and the resist solution supply path 1 on the downstream side of the buffer tank 303 are passed through. Fill with the solvent delivered from the solvent supply source 21. Subsequently, the solvent in the liquid end tank 23 is heated by the jacket heater 71.
- the heating target liquid temperature is a temperature at which an organic substance adhering in the resist liquid supply path 1 described later can be dissolved, and the filter unit 3 does not change in quality. More specifically, the set temperature of the solvent is a temperature that can maintain the state in which the organic matter is dissolved even if the solvent is cooled by contact with the pipe before the solvent reaches the nozzle 13. Good.
- the set temperature is, for example, 60 to 100 ° C., and an example is 70 ° C.
- the valves V14, V15, V16, V18, V21, V23 are opened, the pressure in the pump 25 is reduced, and the resist solution supply path from the liquid end tank 23 is opened. 1, the heated solvent is sucked into the pump 25. Then, after allowing the solvent to stay in the pump 25 for a certain time, for example, 10 seconds, the valve V25 and the dispense valve 27 are opened, and the pump 25 is pressurized to discharge the solvent from the nozzle 13. After the solvent in the pump 25 is discharged, all the valves are closed again.
- the temperature of the solvent detected by the temperature detector S1 is compared with the set temperature. If the temperature of the solvent is within a certain range from the set temperature, the suction of the solvent into the pump 25 and The solvent is discharged from the nozzle 13. When the temperature of the solvent is below the predetermined range from the set temperature, the solvent is heated again until the temperature of the solvent reaches the set temperature. When the solvent reaches the set temperature, the suction of the solvent into the pump 25 and the discharge of the solvent from the nozzle 13 are performed again.
- the step of sucking the heated solvent into the pump 25 and the step of discharging from the nozzle 13 as described above are repeated, for example, 100 times, each time, for example, until the amount of solvent twice the volume of the pipe is discharged from the nozzle 13. .
- the valve V12 is opened at the suction timing of the pump 25, and an appropriate amount of solvent is transferred from the solvent supply source 21 to the liquid end tank 23. And may be replenished.
- the resist process is performed with a resist solution using a resist solution supply apparatus.
- the valve V303 is closed, and the solvent in the resist solution supply path 1 is discharged.
- the valves V301, V302, and V304 are opened, and the resist solution is supplied from the resist solution supply source 301 into the resist solution supply path 1.
- by applying pressure by the pump 25, for example, 0.1 mL of the resist solution in the buffer tank 303 is discharged onto the wafer W, and the solvent is applied to the wafer W by a spin coating method.
- the solvent is heated in the liquid end tank 23 and supplied into the resist solution supply path 1.
- the resist solution is obtained by dissolving a resist component in a solvent, and the temperature of the resist solution when the resist solution is supplied to the wafer W and liquid processing (resist film formation processing) is performed is room temperature.
- the solubility of the organic substance in the heated solvent is larger than the solubility in the solvent used during the liquid treatment.
- the affinity for the organic matter is increased by heating the solvent, the solvent easily enters between the wetted part of the inner wall of the pipe or a part such as a valve and the organic matter adhering thereto.
- the organic substance itself may be heated and softened. For this reason, since the organic matter is dissolved and easily peeled off from the inner wall of the pipe, the inside of the resist solution supply path 1 can be cleaned in a short time, and the consumption of the solvent is reduced. According to the fifth embodiment, it is possible to reduce the amount of organic substances adhering to the resist solution supply path 1 by the solvent before the liquid processing using the resist solution.
- the solvent was heated by the jacket heater 71 attached to the liquid end tank 23.
- the liquid end tank 23 may be heated by a ribbon heater.
- the entire liquid end tank 23 may be heated with temperature-controlled water. In these cases, similar effects can be obtained.
- FIG. 14 is a diagram showing the entire piping system of a solvent supply apparatus which is a sixth embodiment of the processing liquid supply apparatus of the present invention.
- the same components as those in the fifth embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the difference of the sixth embodiment from the fifth embodiment is that instead of attaching the jacket heater 71 to the liquid end tank 23, the surface of the pipe leading from the solvent supply source 21 to the nozzle 13 is covered with the ribbon heater 72.
- the temperature detection unit S1 is provided on the pipe surface immediately before the dispense valve 27, for example.
- the ribbon heater 72 heats the solvent in the resist solution supply path 1 to a set temperature. Then, similarly to the fifth embodiment, the step of sucking the solvent by the pump 25 and the step of discharging the solvent from the pump 25 from the nozzle 13 after a predetermined time are repeated a predetermined number of times. Thus, the same effect as that of the fifth embodiment can be obtained by allowing the heated solvent to flow through the resist solution supply path 1.
- FIG. 15 is a diagram illustrating the entire piping system according to the seventh embodiment of the present invention.
- the seventh embodiment differs from the fifth embodiment in that the heat generating cover body 41 used in the first embodiment is attached to the filter unit 3 instead of the jacket heater 71, and the dispensing is performed.
- a branch path 73 that branches from the resist solution supply path 1 immediately before the valve 27 and returns the solvent to the liquid end tank 23 via the valve V73 is provided.
- the temperature detection unit S1 is provided on the downstream side immediately after the filter unit 3, for example.
- the resist including the liquid end tank 23, the buffer tank 303, and the filter unit 3 on the downstream side of the buffer tank 303 with the valve V302 interposed between the resist solution supply source 301 and the buffer tank 303 closed.
- the solvent in the solvent supply source 21 is filled in the liquid supply path 1.
- the solvent inside the filter unit 3 is heated by the heat generating cover body 41.
- valves V14, V15, V16, V18, V21, and V23 are opened, the pressure in the pump 25 is reduced, and the resist solution supply path 1 from the liquid end tank 23 is opened. Then, the heated solvent is sucked into the pump 25. Then, after allowing the solvent to stay in the pump 25 for a certain period of time, the valves V17 and V73 are opened to pressurize the pump 25, thereby returning the solvent to the liquid end tank 23. After the solvent in the pump 25 is discharged, the valves V17 and V73 are closed.
- a liquid having an amount twice as large as the pipe volume is supplied to the liquid end tank 23 and the resist solution supply path 1. And it may be repeated until it circulates through the circulation path consisting of the branch path 73.
- the solvent is heated by the filter unit 3 inside the resist solution supply path 1, and the heated solvent is returned to the liquid end tank 23 via the branch path 73 and reused. It becomes difficult for the temperature of the solvent to decrease. Further, consumption of the solvent can be reduced.
- the heat generating cover body 41 is provided in the filter unit 3, and the solvent flowing through the resist solution supply path 1 is heated and kept warm by heating the filter unit 3.
- the part for heating the solvent in the resist solution supply path 1 is not limited to the filter unit 3.
- the liquid end tank 23 or the pump 25 may be heated, or a specific length range of piping constituting the resist solution supply path 1 may be locally heated.
- the device configurations according to the fifth to seventh embodiments described above can be combined with each other.
- the liquid end tank 23 having the jacket heater 71 according to the fifth embodiment and the resist solution supply path 1 covered with the ribbon heater 72 according to the sixth embodiment can be combined. With this combination, after the solvent is heated in the liquid end tank 23, the solvent can be passed through the nozzle 13 while preventing the ribbon heater 72 from lowering the temperature of the solvent.
- each apparatus configuration according to the fifth to seventh embodiments described above may be combined with the cleaning of the filter unit 3 according to the first to fourth embodiments.
- the cleaning of the filter unit 3 For example, by supplying a heated solvent from a liquid end tank to the resist solution supply path 1, the organic substance is discharged from the resist solution supply path 1, and then a solvent that dissolves the resin in the filter unit 3 that causes particles is added to the resist solution.
- the filter unit 3 may be cleaned by supplying it to the supply path 1.
- a heating unit such as the heat generation cover body 41 of the first embodiment is attached to the filter unit 3, and the resist solution supply path 1 and the filter unit 3 are cleaned by heating a solvent or the like by the heating unit. May be.
- the processing liquid supply apparatus is a resist liquid supply apparatus.
- the wafer W is supplied before the resist liquid is supplied to the wafer W, for example, as in the first embodiment.
- It may be a solvent supply device for pre-wetting the surface with a solvent.
- the processing solvent supply source (solvent tank) 21 for supplying the prewetting solvent as the processing liquid.
- the same preprocessing method as that described in the fifth to seventh embodiments can be employed.
- a configuration in which a pipe from a solvent supply source for supplying a heated solvent exclusively for cleaning is joined to the solvent supply path 1 on the downstream side of the processing solvent supply source (solvent tank) 21 (see FIG. 1). It may be adopted.
- the solvent supply path 1 treatment liquid supply path
- the heated solvent is supplied from the processing solvent supply source 21 to the connection source of the solvent supply path 1 by switching a valve, for example. Switch to a solvent supply for cleaning.
- Results of the evaluation test A are shown as a graph in FIG. From the results shown in the graph, the phenomenon that the number of particles in the thinner increases after the thinner stays in the apparatus on the second day, the third day, the 30th day, the 75th day, and the 150th day. was confirmed. The increase rate of the number of particles after staying on the second day (after staying for 1 h / immediately after passing through) was the largest. Even after several months have passed since the installation of the new filter unit in the apparatus, a phenomenon was observed in which the number of particles increased after residence.
- Evaluation test 1 on correlation between filter pre-processing and number of particles (Evaluation test B) A test for evaluating the effect of the pretreatment according to the second embodiment described above was performed. Using a pretreatment device (5) similar to the pretreatment device according to the second embodiment shown in FIG. 6, the filter unit (3) at 60 ° C. in the same procedure as described in the second embodiment. The pretreatment of was performed. The pretreated filter unit (3) was attached to the solvent supply path of the solvent supply device. The same thinner as used in the evaluation test A is flowed into the 2-gallon solvent supply path (1) to purge the solvent supply path (1), and immediately after that, 3 mL is discharged onto the rotating wafer W, and then the wafer is discharged. The number of particles remaining in W was counted.
- the thinner was allowed to stay in the solvent supply path (1) for 1 hour, and then 3 mL of the thinner was discharged onto the rotating wafer W. Thereafter, the number of particles remaining on the wafer W was counted.
- the solvent was allowed to remain in the solvent supply path (1).
- 1 gallon of new solvent is introduced into the solvent supply path (1) to purge the solvent supply path, and then 3 mL of the solvent is discharged from the nozzle (13) onto the wafer W and remains on the wafer W. I counted the number of particles.
- the thinner was allowed to stay in the solvent supply path (1) for 1 hour, and then 3 mL of the thinner was discharged onto the rotating wafer W.
- the thinner was discharged and the number of particles was counted in the same procedure as in the second day.
- a filter unit (3) that does not perform pretreatment is mounted on the solvent supply path (1) of the solvent supply apparatus, and thinner is discharged onto the wafer W and the number of particles is measured in the same procedure as described above. It was. The test of the comparative example was performed only on the first day.
- Results of the evaluation test B are shown as a graph in FIG. As a control, the result of the filter unit without pretreatment is shown at the left end. From the results shown in the graph, it is clear that when the pre-processing is performed on the filter unit, the increase in the number of particles after the thinner is retained in the apparatus can be suppressed compared to the case where the pre-processing is not performed. It is. On the third and seventh days, a slight increase in the number of particles was observed after the residence. This increase in the number of particles means that the degree of immersion of the entire filter unit in the thinner was higher than that on the first and second days, and the particle-causing substance eluted from the part that was not immersed in the thinner. Is considered to be the cause.
- Evaluation test 2 on correlation between filter pre-processing and number of particles (Evaluation test C) For each of the filter unit made of UPE for the filter part and the filter unit made of nylon for the filter part, a test for evaluating the effect of heating in the pretreatment was performed using the same pretreatment device as the pretreatment device 5. . Specifically, for each filter unit, prepare a plurality of filters of the same lot, divide the plurality of filters into two groups, and perform pre-processing with heating similar to the evaluation test B for one group, The other group was pretreated without heating as a control.
- the same thinner as used in the evaluation test A is flowed into the 2-gallon solvent supply path (1) to purge the solvent supply path (1), and immediately after that, the thinner is rotated on the wafer W. After 3 mL was discharged, the number of particles remaining on the wafer W was counted. Thereafter, the thinner was allowed to remain in the solvent supply path (1) for 16 hours, and then 3 mL of the thinner was discharged onto the rotating wafer W. Thereafter, the number of particles remaining on the wafer W was counted.
- the results of the evaluation test C are shown as graphs in FIGS.
- the results when warming is performed in the pretreatment are shown on the right side, and the results when warming is not used in the pretreatment are shown on the left side as controls.
- 18 shows the number of particles discharged from the filter unit whose filter part is made of UPE
- FIG. 19 shows the number of particles discharged from the filter unit whose filter part is made of nylon. From both graphs, it was confirmed that the increase in the number of particles after the thinner was retained can be suppressed by performing the heating at the time of the pretreatment as compared with the case of not performing the heating.
- the analysis of variance was performed on the number of particles shown in FIGS. 18 and 19, a significant difference was confirmed. From this, it can be said that the pretreatment for the filter unit of the present invention can suppress the phenomenon that the number of particles increases due to retention of thinner in the filter unit.
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Abstract
Description
本発明の他の目的は、処理液を被処理体に対し供給して液処理を行うにあたって、処理液供給路内の有機物に起因する被処理体の汚染を処理液供給路の前処理により抑えると共に、前処理を速やかに行うことができる技術を提供することにある。
「溶剤を含む処理液」には、処理液の100%が溶剤から構成される場合と、溶剤と塗布膜成分等の他の成分との混合物により処理液が構成される場合の双方が含まれる。
本発明のさらに他の実施形態によれば、被処理体を液処理するための溶剤を含む処理液を被処理体に供給する処理液供給装置において、被処理体に処理液を吐出するための処理液吐出部がその一端側に設けられ、他端側に処理液供給源が接続される処理液供給路と、前処理用の溶剤を処理液供給路の内部に供給するための前処理機構と、前記前処理用の溶剤に対する有機物の溶解度が、前記処理液に含まれる溶剤に対する前記有機物の溶解度よりも高いことを特徴とする処理液供給装置が提供される。
図1は、本発明の処理液供給装置の実施の形態の一つである溶剤供給装置の配管系全体を示す図である。この溶剤供給装置は、溶剤ボトルを含む溶剤供給源21、リキッドエンドタンク23、フィルタユニット3、第1のトラップ24、ポンプ25、第2のトラップ26、ディスペンスバルブ27、ノズル13を上流側からこの順に、例えば配管である溶剤供給路1に配置して構成されている。V11~V25はバルブ、10は液処理部である。フィルタユニット3は溶剤中の異物(パーティクル)を除去するためのものであり、第1のトラップ24、第2のトラップ26は溶剤中の気泡を除去するためのものである。この例では溶剤が処理液に相当する。
第2の実施形態は、処理液供給装置に取り付ける前の新規なフィルタ部3に対して、図6に示す専用の前処理装置5を用いて既述の前処理を行う方法に関する。前処理装置5においては、溶剤を貯留したボトル21aに溶剤供給路501が突入されており、溶剤供給路501にフィルタユニット3の流入口331が接続されている。フィルタユニット3の流出口332には溶剤排出路503が接続されると共に、フィルタユニット3のベントポート333にはベント管502が接続されている。また、ベント管502と溶剤排出路503が合流して、溶剤排出路504となっている。V12、V51、V52はバルブ、21aは溶剤供給源、22aはN2ガス供給源である。フィルタユニット3は、液槽51内に浸漬されており、液槽51内はヒータ53により加熱された温水が満たされている。
本発明の処理液供給装置の第3実施形態に係る溶剤供給装置について、図9を参照しながら説明する。第1の実施形態に係る溶剤供給装置と同一の構成要素については、同一の符号を振り説明を省略する。この第3実施形態に係る溶剤供給装置におけるバルブV14より下流側の構成は、発熱カバー体41を有する機構部分4が設けられていないこと以外は、第1の実施形態にかかる溶剤供給装置の構成と同一である。フィルタユニット3が介設されている溶剤供給路105のバルブV14より上流側において、溶剤供給路105が切替バルブV26を介して2つの分岐路(101+102;103+104)に分岐されている。一方の分岐路にはN2ガス供給源22、第1の溶剤供給源21、リキッドエンドタンク23が上流側から順に設けられている。他方の分岐路にはN2ガス供給源62、第2の溶剤供給源61、リキッドエンドタンク63が上流側から順に設けられている。
第1~第3の実施形態の代替として、あるいはこれらの実施形態と組み合わせて図12に示すような超音波を用いた前処理装置を用いてもよい。図12において7は第4実施形態に係る超音波を用いた前処理装置であり、容器72はフィルタユニット3を収納するための容器であり、この容器72内に超音波伝搬媒体である液体、例えば水が満たされている。71は超音波発生部である。フィルタユニット3内部の低分子成分は、超音波発生部71から印加される超音波によって溶剤中に溶解される。液処理用の溶剤に超音波を印加することにより、低分子量成分の溶解度が大きくなる。すなわち、この第4実施形態では、超音波が印加されている溶剤が前処理用の溶剤に該当する。この第4実施形態においても、超音波を印加しながら例えば図4に示すフローに従い前処理を行う。この第4実施形態においても、上述してきた実施形態と同様の効果を得ることができる。前処理装置7は上述の溶剤供給装置に組み込んでもよいし、また溶剤供給装置から独立した別個の装置であってもよい。
図13は、本発明の処理液供給装置の第5の実施形態であるレジスト液供給装置を示す図である。図1の実施形態では、溶剤供給源21及びリキッドエンドタンク23に関する構成は、処理液としての溶剤を供給するための構成である。これに対して図13の実施形態では、溶剤供給源及びリキッドエンドタンクが図1と同一の符号にて示しているが、ここから供給される溶剤は液処理用のものではなく、前処理用の溶剤、即ち配管内を洗浄するための溶剤である。処理液であるレジスト液の供給源(レジスト液ボトル)及びリキッドエンドタンク(バッファタンク)には、夫々符号301及び303を付している。302はN2ガス供給源、V301~V304はバルブを示している。また、レジスト液供給路については、第1~第4の実施形態における溶剤供給路1と同じ構成であるため、説明の便宜上同一の符号1にて示す。
図14は、本発明の処理液供給装置の第6の実施形態である溶剤供給装置の配管系全体を示す図である。第6の実施形態(後述の第7の実施形態も)において第5の実施形態と同一の構成要素については、同一の符号を付し説明を省略する。第6の実施形態における第5の実施形態との差異は、リキッドエンドタンク23にジャケットヒータ71を取り付ける代わりに、溶剤供給源21からノズル13まで通じる配管表面をリボンヒータ72にて被覆したこと、並びに、温度検出部S1が例えばディスペンスバルブ27直前の配管表面に設けられていることである。
図15は、本発明の第7の実施の形態の配管系全体を示す図である。この第7の実施形態の第5の実施形態との差異は、ジャケットヒータ71の代わりに、フィルタユニット3に対して第1の実施形態で用いた発熱カバー体41を取り付けたこと、並びに、ディスペンスバルブ27の直前の上流側でレジスト液供給路1から分岐し、バルブV73を介してリキッドエンドタンク23へと溶剤を戻す分枝路73が設けられている点である。この第7実施形態においては、温度検出部S1は例えばフィルタユニット3の直後の下流側に設けられる。
A.フィルタ通液後の溶剤滞留とパーティクルの数の相関に関する評価試験
(評価試験A)
上述した第1の実施形態における溶剤供給装置(1)から発熱カバー体(41)を省いた構成を有する液処理装置を用いて、新品のフィルタユニットを取り付けた後に次のような試験を行った。先ず初日にシンナー(OK73シンナー・登録商標・東京応化工業社製)を23℃で溶剤供給装置内に1ガロン(約3.8L)導入して気泡の除去を行った(前述のウェッティング処理を参照)。続いて溶剤ボトル(21)から0.5L(リットル)の溶剤を溶剤供給路(1)に流し(この0.5Lの液はノズル(13)からのダミーディスペンスにより廃棄する。)、その後溶剤をノズル(13)から3mL吐出して、回転しているウエハWの中心部に供給する。その後、このウエハW上に残存しているパーティクルの数をカウントした。更に続いて、上記と同様に溶剤ボトルから0.5L(積算量で1L)の溶剤を溶剤供給路に流した後、上記と同様に3mLの溶剤をウエハWに供給し、ウエハ上Wに残存しているパーティクルの数をカウントした。その後、積算量で1.5L、4.0L、8.0Lの溶剤を溶剤供給路(1)に流した後にそれぞれ、同様に3mLの溶剤をウエハWに供給し、ウエハ上Wに残存しているパーティクルの数をカウントした。以上の一連の試験を初日(1日目)に行った後、溶剤供給路(1)内に溶剤を滞留させたまま放置した。
2日目に、溶剤供給路(1)内に新しい溶剤1ガロンを導入して溶剤供給路内をパージし、その後、溶剤をノズル(13)からウエハWに3mL吐出し、ウエハW上に残存しているパーティクルの数をカウントした。その後、フィルタユニット(3)内に溶剤を滞留させた状態で1時間放置した。その後、ノズル(13)から回転しているウエハWの中心に溶剤を3mL吐出し、ウエハW上に残存しているパーティクルの数をカウントした。以上の一連の試験を2日目に行った後、溶剤供給路(1)内に溶剤を滞留させたまま放置した。更に2日目と同様の試験を3日目、30日目、75日目、150日目の夫々について行った。なお、この試験及び他の試験では、直径28nm以上の粒子のみをカウント対象のパーティクルとした。
(評価試験B)
上述した第2の実施形態による前処理の効果を評価するための試験を行った。図6に示した第2の実施形態に係る前処理装置と同様の前処理装置(5)を用いて、第2実施形態で説明したのと同様の手順で60℃にてフィルタユニット(3)の前処理を行った。前処理済みのフィルタユニット(3)を溶剤供給装置の溶剤供給路に装着した。評価試験Aで用いたものと同じシンナーを2ガロン溶剤供給路(1)に流して溶剤供給路(1)をパージし、その直後にシンナーを回転するウエハW上に3mL吐出し、その後にウエハWに残存するパーティクルの数をカウントした。その後、1時間溶剤供給路(1)内にシンナーを滞留させたまま放置し、その後シンナーを回転するウエハW上に3mL吐出し、その後にウエハWに残存するパーティクルの数をカウントした。以上の試験を行った後、溶剤供給路(1)内に溶剤を滞留させたまま放置した。2日目に、溶剤供給路(1)内に新しい溶剤1ガロンを導入して溶剤供給路内をパージし、その後、溶剤をノズル(13)からウエハWに3mL吐出し、ウエハWに残存しているパーティクルの数をカウントした。その後、1時間溶剤供給路(1)内にシンナーを滞留させたまま放置し、その後シンナーを回転するウエハW上に3mL吐出し、その後にウエハWに残存するパーティクルの数をカウントした。3日目、7日目にも2日目と同様の手順でシンナーの吐出及びパーティクルの数のカウントを行った。さらに比較例として、前処理を行わないフィルタユニット(3)を溶剤供給装置の溶剤供給路(1)に装着し、上記と同じ手順でウエハWへのシンナーの吐出及びパーティクルの数の計測を行った。比較例の試験は1日目のみ行った。
(評価試験C)
フィルタ部がUPEからなるフィルタユニット、及びフィルタ部がナイロンからなるフィルタユニットの夫々について、前処理装置5と同様の前処理装置を用いて、前処理における加温の効果を評価する試験を行った。具体的には、各種フィルタユニットにつき、同ロットの複数のフィルタを用意し、これら複数のフィルタを2グループに分け、一方のグループについては評価試験Bと同様に加温を伴う前処理を行い、他方のグループについては対照として加温を伴わない前処理を行った。評価試験Bと同様に、評価試験Aで用いたものと同じシンナーを2ガロン溶剤供給路(1)に流して溶剤供給路(1)をパージし、その直後にシンナーを回転するウエハW上に3mL吐出し、その後にウエハWに残存するパーティクルの数をカウントした。その後、16時間溶剤供給路(1)内にシンナーを滞留させたまま放置し、その後シンナーを回転するウエハW上に3mL吐出し、その後にウエハWに残存するパーティクルの数をカウントした。
Claims (20)
- 被処理体を液処理するための溶剤を含む処理液中に含まれる異物を除去するために、処理液供給路に設けられるフィルタユニットを前処理する方法において、
前処理用の溶剤にフィルタ部を浸す工程を含み、
前記前処理用の溶剤に対する前記フィルタユニットのフィルタ部を構成する樹脂の溶解度が、前記処理液に用いられる溶剤に対する前記樹脂の溶解度よりも高いことを特徴とするフィルタユニットの前処理方法。 - 前記前処理用の溶剤にフィルタ部を浸す工程は、フィルタユニット内に存在する前処理用の溶剤を新しい前処理用の溶剤に置換する工程を含むことを特徴とする請求項1記載のフィルタユニットの前処理方法。
- 前記前処理用の溶剤は、加熱された溶剤であることを特徴とする請求項1記載のフィルタユニットの前処理方法。
- 前記フィルタユニットに導入される前に、前記前処理用の溶剤を予備加熱する工程を含むことを特徴とする請求項3記載のフィルタユニットの前処理方法。
- 前記加熱された溶剤は、前記処理液に含まれる溶剤と同じ種類の溶剤であることを特徴とする請求項3記載のフィルタユニットの前処理方法。
- 前記前処理用の溶剤は、前記処理液に含まれる溶剤とは異なる種類の溶剤であることを特徴とする請求項1記載のフィルタユニットの前処理方法。
- 前記前処理用の溶剤に、超音波を印加する工程を含む請求項1記載のフィルタユニットの前処理方法。
- 被処理体を液処理するための溶剤を含む処理液を被処理体に供給する処理液供給装置において、
被処理体に処理液を吐出するための処理液吐出部がその一端側に設けられ、他端側に処理液供給源が接続される処理液供給路と、
処理液中の異物を除去するために前記処理液供給路に設けられ、樹脂からなるフィルタ部を有するフィルタユニットと、
前記フィルタ部が前処理用の溶剤に浸された状態を形成する前処理機構と、
を備え、
前記前処理用の溶剤に対する前記フィルタユニットのフィルタ部を構成する樹脂の溶解度が、前記処理液に含まれる溶剤に対する前記樹脂の溶解度よりも高い
ことを特徴とする処理液供給装置。 - 前記前処理機構は、前記フィルタ部を加熱する加熱機構を含むことを特徴とする請求項8記載の処理液供給装置。
- 前記加熱機構は、フィルタユニットが収容される本体と、当該本体を加熱するための加熱部と、を備え、前記加熱部は、第1の反応物質を収容するための第1の収容部と、前記第1の反応物質と接触することにより発熱反応を起こす第2の反応物質を収容するための前記第1の収容部から隔離された第2の収容部と、第1の反応物質と第2の反応物質の隔離状態を解除して両者を接触させる隔離解除部と、を備えたことを特徴とする請求項9記載の処理液供給装置。
- 前記前処理機構は、前記フィルタユニットに導入される前に前処理用の溶剤を予備加熱するための加熱機構を含むことを特徴とする請求項9記載の処理液供給装置。
- 前記前処理機構は、前記処理液に含まれる溶剤とは種類の異なる前処理用の溶剤を供給する前処理用の溶剤供給源と、前記処理液供給源から前記フィルタ部に処理液を供給する処理液供給路と前記前処理用の溶剤供給源から前記フィルタ部に溶剤を供給する溶剤供給路とを切り替える流路切り替え機構と、を備えたことを特徴とする請求項8記載の処理液供給装置。
- 前記前処理機構は、フィルタ部に超音波を印加する超音波発振部を含むことを特徴とする請求項8記載の処理液供給装置。
- 被処理体を液処理するための溶剤を含む処理液中に含まれる異物を除去するために処理液供給路に設けられるフィルタユニットを加熱する加熱装置であって、フィルタユニットが収容される本体と、当該本体を加熱するための加熱部と、を備え、前記加熱部は、第1の反応物質を収容するための第1の収容部と、前記第1の反応物質と接触することにより発熱反応を起こす第2の反応物質を収容するための前記第1の収容部から隔離された第2の収容部と、第1の反応物質と第2の反応物質との隔離状態を解除して両者を接触させる隔離解除部と、を備えたことを特徴とするフィルタユニットの加熱装置。
- 被処理体を液処理するための溶剤を含む処理液中に含まれる有機物からなる異物を除去するために処理液供給路を前処理する方法において、
前処理用の溶剤を処理液供給路に供給する工程と、
その後に、前記前処理用の溶剤を処理液供給路から排出する工程と、
を備え、
前記前処理用の溶剤に対する前記有機物の溶解度が、前記処理液に含まれる溶剤に対する前記有機物の溶解度よりも高い
ことを特徴とする処理液供給路の前処理方法。 - 前記前処理用の溶剤を処理液供給路内部に供給する工程は、処理液供給路内部に存在する前処理用の溶剤を新しい前処理用の溶剤に置換する工程を含むことを特徴とする請求項15記載の処理液供給路の前処理方法。
- 前記前処理用の溶剤は、加熱された溶剤であることを特徴とする請求項15記載の処理液供給路の前処理方法。
- 被処理体を液処理するための溶剤を含む処理液を被処理体に供給する処理液供給装置において、
被処理体に処理液を吐出するための処理液吐出部がその一端側に設けられ、他端側に処理液供給源が接続される処理液供給路と、
前処理用の溶剤を処理液供給路の内部に供給するための前処理機構と、
前記前処理用の溶剤に対する有機物の溶解度が、前記処理液に含まれる溶剤に対する前記有機物の溶解度よりも高いことを特徴とする処理液供給装置。 - 前記前処理機構は、前記処理液供給路を加熱するための加熱機構を含むことを特徴とする請求項18記載の処理液供給装置。
- 前記前処理機構は、前記処理液供給路の内部へ加熱した溶剤を供給する溶剤供給機構を含むことを特徴とする請求項18記載の処理液供給装置。
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KR20160064107A (ko) | 2016-06-07 |
KR102217821B1 (ko) | 2021-02-18 |
TW201526994A (zh) | 2015-07-16 |
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US20200016521A1 (en) | 2020-01-16 |
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US10974181B2 (en) | 2021-04-13 |
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