WO2023127488A1 - 異物検出装置及び異物検出方法 - Google Patents
異物検出装置及び異物検出方法 Download PDFInfo
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- WO2023127488A1 WO2023127488A1 PCT/JP2022/045915 JP2022045915W WO2023127488A1 WO 2023127488 A1 WO2023127488 A1 WO 2023127488A1 JP 2022045915 W JP2022045915 W JP 2022045915W WO 2023127488 A1 WO2023127488 A1 WO 2023127488A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G01N21/85—Investigating moving fluids or granular solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/94—Investigating contamination, e.g. dust
Definitions
- the present disclosure relates to a foreign object detection device and a foreign object detection method.
- Patent Document 1 as a substrate processing apparatus for optically detecting foreign matter in a supply path through which a fluid supplied to a substrate flows, light is projected onto a flow path forming portion through which the fluid flows, and the result is A method of receiving light generated from a flow path forming portion and detecting a foreign object from the intensity of the light is disclosed.
- the present disclosure provides a technology capable of efficiently detecting foreign matter according to the state of the target liquid.
- a foreign matter detection device configured to detect a foreign matter contained in a processing liquid for substrate processing, and includes a processing liquid flow path through which the processing liquid supplied to the substrate flows. a plurality of treatment liquid flow path forming portions forming a; an irradiation portion configured to be capable of individually irradiating irradiation light from a light source toward each of the plurality of treatment liquid flow paths; a light-receiving unit configured to receive light emitted from the treatment liquid flow path, wherein the irradiation unit varies the amount of the irradiation light with which the plurality of treatment liquid flow paths are irradiated. Includes light adjustment.
- a technique is provided that allows foreign matter to be detected efficiently according to the state of the target liquid.
- FIG. 1 is a schematic perspective view showing an example of a substrate processing system.
- FIG. 2 is a schematic diagram showing an example of a coating and developing apparatus.
- FIG. 3 is a schematic diagram showing an example of a liquid processing unit.
- FIG. 4 is a schematic diagram showing an example of the processing liquid supply section of the liquid processing unit.
- FIG. 5 is a side view schematically showing an example of a foreign object detection unit.
- FIG. 6 is a perspective view schematically showing an example of a foreign object detection unit.
- FIG. 7 is a side view schematically showing an example of a foreign object detection unit.
- FIG. 8 is a block diagram illustrating an example of a functional configuration of a control unit;
- FIG. 9 is a graph showing an example of signal intensity according to detected light.
- FIGS. 1 is a schematic perspective view showing an example of a substrate processing system.
- FIG. 2 is a schematic diagram showing an example of a coating and developing apparatus.
- FIG. 3 is a schematic diagram showing an
- FIG. 10A and 10B are diagrams for explaining an example of the relationship between light intensity change and detected light.
- FIG. 11 is a block diagram illustrating an example of a hardware configuration of a control unit;
- FIG. 12 is a flow chart showing an example of a foreign matter detection method.
- FIG. 13 is a flow chart showing an example of a light intensity adjustment method used in the foreign object detection method.
- FIG. 14 is a side view schematically showing another example of the foreign object detection unit.
- a foreign object detection device is configured to detect foreign matter contained in a processing liquid for substrate processing, and includes a plurality of processing liquid flow paths through which the processing liquid supplied to the substrate flows.
- a processing liquid flow path forming section configured to an irradiation section configured to be capable of individually irradiating irradiation light from a light source toward each of the plurality of processing liquid flow paths;
- a light receiving section configured to receive the emitted light, wherein the irradiating section includes a light adjusting section that varies the light amount of the irradiation light that irradiates the plurality of treatment liquid flow paths.
- the light emitted from the light source is irradiated onto the treatment liquid flow path after the amount of light is adjusted by the light adjustment section included in the irradiation section.
- the amount of light irradiated to the plurality of processing liquid flow paths is reduced. Since the amount of light can be adjusted, it is possible to efficiently detect foreign matter according to the state of the processing liquid in each processing liquid flow path.
- the irradiation unit can irradiate the irradiation light toward each of the plurality of processing liquid flow paths by moving relative to the plurality of processing liquid flow paths. It may be provided on an optical path directed to each of a plurality of processing liquid flow paths. In this case, since it is possible to individually adjust the amount of light for each processing liquid flow path, it is possible to flexibly adjust the amount of light.
- the light adjustment unit adjusts the noise component contained in the light received by the light receiving unit when one of the plurality of processing liquid flow paths is irradiated with the irradiation light,
- the first processing is performed so that the intensity of the haze noise component, which fluctuates according to the intensity of the irradiation light, approaches the intensity of the stationary noise under the condition that the intensity of the stationary noise component generated regardless of the intensity of the irradiation light is not less than the intensity of the stationary noise component.
- a mode may be adopted in which the amount of the irradiation light irradiated to the liquid flow path is adjusted.
- the haze noise component is a component that varies according to the intensity of the irradiation light. Therefore, by adjusting the intensity of the irradiation light so as to approach the intensity of the stationary noise component, it is possible to reduce the intensity of the irradiation light while preventing a decrease in foreign object detection accuracy.
- the intensity of the irradiation light applied to the one treatment liquid flow path may be adjusted so that the intensity of the haze noise component, which fluctuates according to the intensity of the light, approaches the intensity of the stationary noise.
- the intensity of the stationary noise component and the intensity of the haze noise component are estimated based on the electrical signal corresponding to the light received by the light receiving section, and the light intensity of the irradiation light is based on the results. is adjusted. Therefore, the intensity of irradiation light can be adjusted more accurately.
- the control unit determines the intensity of the stationary noise component and the intensity of the stationary noise component and the The intensity of the haze noise component may also be estimated. Since the intensity of the haze noise component can fluctuate depending on the intensity of the irradiation light, the stationary noise component and the haze noise component differ based on the difference in the light received by the light receiving unit when different amounts of irradiation light are irradiated as in the above configuration. By estimating the intensity of the noise component, it becomes possible to more accurately estimate the relationship between the haze noise component and the stationary noise component.
- a foreign matter detection method is a foreign matter detection method for a foreign matter detection apparatus configured to detect foreign matter contained in a processing liquid for substrate processing, and includes a plurality of processing liquid flow paths through which the processing liquid supplied to the substrate flows. irradiating irradiation light from a light source toward , and receiving light emitted from the treatment liquid flow path by the irradiation of the irradiation light with a light receiving unit, wherein the irradiation unit and varying the amount of the irradiation light that irradiates the plurality of treatment liquid flow paths by a light adjustment unit.
- the light emitted from the light source is irradiated onto the treatment liquid flow path after the light amount is adjusted by the light adjustment section included in the irradiation section.
- the light emitted to the plurality of processing liquid flow paths Since the amount of light can be adjusted, it is possible to efficiently detect foreign matter according to the state of the processing liquid in each processing liquid flow path.
- a substrate processing system 1 (substrate processing apparatus) shown in FIG. 1 is a system for forming a photosensitive film on a work W, exposing the photosensitive film, and developing the photosensitive film.
- the workpiece W to be processed is, for example, a substrate, or a substrate on which a film, a circuit, or the like is formed by performing a predetermined process.
- a substrate included in the work W is, for example, a wafer containing silicon.
- the workpiece W (substrate) may be circular.
- the workpiece W to be processed may be a glass substrate, a mask substrate, an FPD (Flat Panel Display), or the like, or may be an intermediate obtained by subjecting these substrates or the like to predetermined processing.
- a photosensitive film is, for example, a resist film.
- the substrate processing system 1 includes a coating/developing device 2 and an exposure device 3 .
- the exposure device 3 is a device that exposes a resist film (photosensitive film) formed on a work W (substrate). Specifically, the exposure device 3 irradiates an exposure target portion of the resist film with an energy beam by a method such as liquid immersion exposure.
- the coating/developing device 2 applies a resist (chemical solution) to the surface of the work W to form a resist film before the exposure processing by the exposure device 3, and develops the resist film after the exposure processing.
- the coating/developing apparatus 2 includes a carrier block 4, a processing block 5, an interface block 6, and a control device 18.
- FIG. 1 the coating/developing apparatus 2 includes a carrier block 4, a processing block 5, an interface block 6, and a control device 18.
- the carrier block 4 introduces the workpiece W into the coating/developing device 2 and guides the workpiece W out of the coating/developing device 2 .
- the carrier block 4 can support a plurality of carriers C for works W, and incorporates a transfer device A1 including a transfer arm.
- the carrier C accommodates a plurality of circular works W, for example.
- the transport device A1 takes out the work W from the carrier C, transfers it to the processing block 5, receives the work W from the processing block 5, and returns it to the carrier C.
- the processing block 5 has a plurality of processing modules 11,12,13,14.
- the processing module 11 incorporates a liquid processing unit U1, a thermal processing unit U2, and a transport device A3 that transports the work W to these units.
- the processing module 11 forms a lower layer film on the surface of the workpiece W using the liquid processing unit U1 and the heat processing unit U2.
- the liquid processing unit U1 coats the workpiece W with a processing liquid for forming a lower layer film.
- the heat treatment unit U2 performs various heat treatments associated with the formation of the lower layer film.
- the processing module 12 incorporates a liquid processing unit U1, a thermal processing unit U2, and a transport device A3 that transports the work W to these units.
- the processing module 12 forms a resist film on the lower layer film by the liquid processing unit U1 and the thermal processing unit U2.
- the liquid processing unit U1 applies a processing liquid (resist) for forming a resist film onto the underlying film.
- the heat treatment unit U2 performs various heat treatments associated with the formation of the resist film.
- the processing module 13 incorporates a liquid processing unit U1, a thermal processing unit U2, and a transport device A3 that transports the work W to these units.
- the processing module 13 forms an upper layer film on the resist film using the liquid processing unit U1 and the thermal processing unit U2.
- the liquid processing unit U1 applies a liquid for forming an upper layer film onto the resist film.
- the heat treatment unit U2 performs various heat treatments associated with the formation of the upper layer film.
- the processing module 14 incorporates a liquid processing unit U1, a thermal processing unit U2, and a transport device A3 that transports the work W to these units.
- the processing module 14 uses the liquid processing unit U1 and the thermal processing unit U2 to develop the resist film subjected to the exposure processing and to perform heat processing associated with the development processing.
- the liquid processing unit U1 applies a developer to the surface of the workpiece W that has been exposed, and then rinses the developer with a rinsing liquid to develop the resist film.
- the thermal processing unit U2 performs various types of thermal processing associated with development processing. Specific examples of heat treatment include heat treatment before development (PEB: Post Exposure Bake) and heat treatment after development (PB: Post Bake).
- a shelf unit U10 is provided on the side of the carrier block 4 in the processing block 5.
- the shelf unit U10 is partitioned into a plurality of vertically aligned cells.
- a transport device A7 including an elevating arm is provided in the vicinity of the shelf unit U10. The transport device A7 raises and lowers the work W between the cells of the shelf unit U10.
- a shelf unit U11 is provided on the interface block 6 side in the processing block 5.
- the shelf unit U11 is partitioned into a plurality of vertically aligned cells.
- the interface block 6 exchanges the workpiece W with the exposure apparatus 3.
- the interface block 6 incorporates a transfer device A8 including a transfer arm and is connected to the exposure device 3.
- FIG. The transport device A8 transfers the work W placed on the shelf unit U11 to the exposure device 3.
- the transport device A8 receives the work W from the exposure device 3 and returns it to the shelf unit U11.
- the control device 18 controls the coating/developing device 2 so as to execute the coating/developing process according to the following procedure, for example.
- the control device 18 controls the transport device A1 to transport the work W in the carrier C to the shelf unit U10, and controls the transport device A7 to place the work W in the cell for the processing module 11.
- control device 18 controls the transfer device A3 to transfer the work W on the shelf unit U10 to the liquid processing unit U1 and heat treatment unit U2 in the processing module 11. Further, the control device 18 controls the liquid processing unit U1 and the thermal processing unit U2 so as to form a lower layer film on the surface of the work W. FIG. After that, the control device 18 controls the transfer device A3 to return the work W with the lower layer film formed thereon to the shelf unit U10, and controls the transfer device A7 to place this work W in the cell for the processing module 12. .
- control device 18 controls the transfer device A3 so as to transfer the work W on the shelf unit U10 to the liquid processing unit U1 and heat treatment unit U2 in the processing module 12. Further, the control device 18 controls the liquid processing unit U1 and the thermal processing unit U2 so as to form a resist film on the surface of the work W. FIG. After that, the control device 18 controls the transport device A3 to return the work W to the shelf unit U10, and controls the transport device A7 to place the work W in the cell for the processing module 13. FIG.
- control device 18 controls the transport device A3 to transport the work W on the shelf unit U10 to each unit in the processing module 13. Further, the control device 18 controls the liquid processing unit U1 and the thermal processing unit U2 so as to form an upper layer film on the resist film of the work W. FIG. After that, the control device 18 controls the transport device A3 so as to transport the work W to the shelf unit U11.
- control device 18 controls the transport device A8 so that the workpiece W on the shelf unit U11 is delivered to the exposure device 3. After that, the control device 18 controls the transport device A8 so that the work W subjected to the exposure processing is received from the exposure device 3 and arranged in the cell for the processing module 14 in the shelf unit U11.
- control device 18 controls the transport device A3 so as to transport the work W on the shelf unit U11 to each unit in the processing module 14, and controls the liquid processing unit so that the resist film of the work W is developed. It controls U1 and heat treatment unit U2. After that, the control device 18 controls the transport device A3 to return the work W to the shelf unit U10, and controls the transport devices A7 and A1 to return the work W to the carrier C.
- FIG. Coating/developing processing is completed as described above.
- liquid processing unit U1 processing liquid supply unit
- FIG. 3 the liquid processing unit U1 (processing liquid supply unit) in the processing module 12 for forming a resist film will be described as an example.
- the liquid processing unit U1 has a rotation holding section 20 and a processing liquid supply section 30, as shown in FIG.
- the rotation holding unit 20 holds and rotates the work W based on the operation instruction from the control device 18 .
- the rotation holding portion 20 has, for example, a holding portion 22 and a rotation driving portion 24 .
- the holding portion 22 supports the central portion of the work W horizontally arranged with the surface Wa facing up, and holds the work W by, for example, vacuum suction.
- the rotary drive unit 24 is an actuator including a power source such as an electric motor, and rotates the holding unit 22 around the vertical axis Ax. As a result, the workpiece W on the holding portion 22 rotates.
- the processing liquid supply unit 30 supplies the processing liquid to the surface Wa of the workpiece W by discharging the processing liquid toward the surface Wa of the work W based on the operation instruction of the control device 18 .
- the processing liquid supplied by the processing liquid supply unit 30 is a substrate processing solution used for processing the workpiece W.
- the treatment liquid include a solution (resist) used for forming a resist film, and a solution (for example, thinner) used for pre-wet treatment for increasing the wettability of the surface Wa with respect to the resist.
- the processing liquid supply section 30 has, for example, a plurality of nozzles 32, a holding head 34, and a supply section 36. As shown in FIG.
- the plurality of nozzles 32 eject the treatment liquid onto the surface Wa of the workpiece W held by the holding portion 22, respectively.
- the plurality of nozzles 32 are arranged above the workpiece W while being held by the holding head 34, for example, and individually eject the processing liquid downward.
- the holding head 34 may be configured to be movable in a direction along the surface Wa of the work W by a drive unit (not shown).
- nozzles 32A to 32L an example in which the processing liquid supply section 30 has twelve nozzles 32 (hereinafter referred to as "nozzles 32A to 32L") will be described below.
- the processing liquid is supplied from the supply unit 36 to each of the nozzles 32A to 32L.
- the nozzles 32A to 32L may be supplied with treatment liquids of different types from the supply unit 36.
- FIG. As an example, different types of resist are supplied from the supply unit 36 to the nozzles 32A to 32J, and different types of thinner are supplied from the supply unit 36 to the nozzles 32K and 32L.
- the supply section 36 includes a plurality of supply pipes 42A-42L and a plurality of supply sources 44A-44L.
- the supply pipe 42A forms a flow path between the nozzle 32A and a supply source 44A, which is the liquid source of the processing liquid to be supplied (discharged from the nozzle 32A) to the nozzle 32A.
- the supply source 44A includes, for example, a bottle in which the processing liquid is stored, and a pump that pressure-feeds the processing liquid from the bottle toward the nozzle 32A.
- the supply pipes 42B to 42L also form flow paths between the supply sources 44B to 44L, which are sources of the processing liquid, and the nozzles 32B to 32L, respectively.
- the supply unit 36 further includes a plurality of open/close valves V provided in the plurality of supply pipes 42A to 42L, respectively.
- the opening/closing valve V is switched between an open state and a closed state based on an operation instruction from the control device 18 .
- the flow paths of the supply pipes 42A to 42L are opened and closed.
- the processing liquid flows through the flow paths of the supply pipes 42A to 42L, and the processing liquid is discharged from the nozzles 32A to 32L toward the surface Wa of the workpiece W.
- the coating/developing apparatus 2 further includes a foreign matter detection unit 50 (foreign matter detection device) configured to detect foreign matter (particles) contained in the treatment liquid supplied to the workpiece W.
- the foreign matter detection unit 50 is configured, for example, to detect foreign matter in the treatment liquid flowing through the plurality of supply pipes 42A to 42L.
- the foreign matter detection unit 50 may be arranged near the liquid processing unit U1, or may be arranged inside the housing of the liquid processing unit U1. Some elements of the foreign object detection unit 50 may be provided between the opening/closing valves V and the nozzles 32A-32L on the flow paths of the supply pipes 42A-42L. An example of the foreign object detection unit 50 will be described below with reference to FIGS. 5 to 11 as well.
- the foreign matter detection unit 50 forms channels (hereinafter referred to as "treatment liquid channels") through which the treatment liquids flowing through the supply pipes 42A to 42L are respectively circulated.
- the foreign matter detection unit 50 detects foreign matter in the processing liquid flowing through the processing liquid flow path by receiving light generated in the processing liquid flow path by irradiating the processing liquid flow path with irradiation light (for example, laser light). To detect.
- the foreign matter detection unit 50 has, for example, a housing 52, a flow path forming section 60, and a measuring section .
- Housing 52 includes a top wall 54a, a bottom wall 54b, and side walls 56a-56d.
- the top wall 54a and the bottom wall 54b are each arranged horizontally (along the XY plane).
- the side walls 56a and 56b are arranged vertically (along the YZ plane) along the Y-axis direction and face each other in the X-axis direction (first direction).
- the side walls 56c and 56d are respectively arranged vertically (along the XZ plane) along the X-axis direction and face each other in the Y-axis direction (second direction).
- the housing 52 accommodates the flow path forming section 60 and the measuring section 70 .
- the channel forming unit 60 forms a plurality of processing liquid channels respectively provided on the channels of the supply pipes 42A to 42L.
- Each of the plurality of processing liquid flow paths formed by the flow path forming section 60 is used to detect foreign matter contained in the processing liquid flowing through the processing liquid flow path.
- the flow path forming section 60 has a plurality of treatment liquid flow path forming sections 62A to 62L.
- the plurality of processing liquid flow path forming portions 62A to 62L are configured similarly to each other. In the following, details of the processing liquid flow channel forming portion will be described by taking the processing liquid flow channel forming portion 62A as an example.
- the processing liquid flow path forming part 62A forms the processing liquid flow path 64 on the flow path of the supply pipe 42A connecting the supply source 44A and the nozzle 32A (see also FIG. 4).
- the upstream and downstream ends of the processing liquid flow path 64 are connected to the supply pipe 42A.
- the processing liquid pressure-fed from the supply source 44A is divided into a portion of the flow path of the supply pipe 42A, the processing liquid flow path 64 of the processing liquid flow path forming portion 62A, and the remaining portion of the flow path of the supply pipe 42A. in this order, and is discharged onto the surface Wa of the work W from the nozzle 32A.
- the processing liquid channel forming part 62A includes, for example, a block body 66 inside which a processing liquid channel 64 is formed.
- the block body 66 is made of a material that can transmit laser light used for foreign object detection. Examples of materials forming the block body 66 include quartz and sapphire.
- the block body 66 may be formed in a rectangular parallelepiped shape, and one surface of the block body 66 may face the side wall 56a.
- an inflow port 64a and an outflow port 64b of the processing liquid flow path 64 are formed on a surface of the block body 66 facing the side wall 56a.
- the inlet 64a may be positioned below the outlet 64b.
- the treatment liquid flow path 64 includes, for example, a first flow path 68a, a second flow path 68b, and a third flow path 68c.
- the first flow path 68a is formed to extend horizontally (along the X-axis direction in the drawing) along the bottom wall 54b.
- One end of the first channel 68a near the side wall 56a constitutes the inlet 64a, and the other end of the first channel 68a near the side wall 56b is connected to the second channel 68b.
- the second flow path 68b is formed to extend along the side wall 56a in the vertical direction (along the Z-axis direction).
- One end of the second flow path 68b near the bottom wall 54b is connected to the first flow path 68a, and the other end of the second flow path 68b near the top wall 54a is connected to the third flow path 68c.
- the third flow path 68c is formed to extend horizontally (along the X-axis direction) along the bottom wall 54b.
- One end of the third flow path 68c near the side wall 56b is connected to the second flow path 68b, and the other end of the third flow path 68c near the side wall 56a constitutes an outflow port 64b.
- a supply pipe (hereinafter referred to as “upstream supply pipe 46") on the upstream side of the processing liquid flow path forming portion 62A of the supply pipe 42A is connected to the inlet 64a.
- the outflow port 64b is connected to a supply pipe (hereinafter referred to as “downstream supply pipe 48") on the downstream side of the processing liquid flow path forming portion 62A of the supply pipe 42A.
- the upstream supply pipe 46 and the downstream supply pipe 48 pass through the side wall 56a facing the block body 66 .
- the processing liquid sent from the supply source 44A passes through the upstream supply pipe 46, the first flow path 68a, the second flow path 68b, the third flow path 68c, and the downstream supply pipe 48 in this order, It is supplied to the work W from the nozzle 32A.
- the processing liquid flow path forming portions 62A to 62L shown in FIG. 6 are configured similarly to each other. Therefore, similarly to the processing liquid flow path forming section 62A, the processing liquid flow path forming sections 62B to 62L each include a block body 66 in which the processing liquid flow path 64 is formed.
- the processing liquid channel 64 of each of the processing liquid channel forming portions 62B to 62L includes a first channel 68a, a second channel 68b, and a third channel 68c.
- the upstream supply pipes 46 of the supply pipes 42B to 42L are connected to the inlets 64a (first flow channels 68a) of the processing liquid flow channel forming portions 62B to 62L, respectively.
- the downstream supply pipes 48 of the supply pipes 42B to 42L are connected to the outlets 64b (third flow paths 68c) of the treatment liquid flow path forming portions 62B to 62L, respectively.
- the processing liquid flow path forming portions 62A to 62L are arranged side by side along the direction from the side wall 56d to the side wall 56c (along the Y-axis direction) while facing the side wall 56a.
- the processing liquid flow path forming portions 62A to 62L may be arranged in this order while being spaced apart from each other.
- the height positions (positions in the Z-axis direction) of the first flow paths 68a of the treatment liquid flow path forming portions 62A to 62L may substantially match each other.
- the distances (positions in the X-axis direction) from the side wall 56a of the second flow path 68b of the processing liquid flow path forming portions 62A to 62L may substantially match each other. Further, the height positions (distances from the bottom wall 54b) of the third flow paths 68c of the treatment liquid flow path forming portions 62A to 62L may substantially match each other.
- the first flow paths 68a of the processing liquid flow path forming portions 62A to 62L are arranged side by side along the Y-axis direction.
- the second flow paths 68b of the processing liquid flow path forming portions 62A to 62L are arranged side by side along the Y-axis direction.
- the third flow paths 68c of the processing liquid flow path forming portions 62A to 62L are arranged side by side along the Y-axis direction.
- the measuring section 70 has a light source 72 , an irradiation section 74 , a light receiving section 76 , a holding section 78 and a driving section 80 .
- the light source 72 generates laser light as irradiation light for detecting foreign matter in the treatment liquid.
- the light source 72 emits laser light with a wavelength of approximately 400 nm to 1000 nm and an output of approximately 600 mW to 1000 mW, for example.
- the light source 72 is provided on the bottom wall 54b and arranged below the treatment liquid flow path forming portions 62A to 62L.
- the light source 72 emits laser light in a direction (Y-axis negative direction) from the side wall 56d toward the side wall 56c.
- the light source 72 is arranged at a position different from the processing liquid flow path forming portion 62A in the Y-axis direction.
- the light source 72 is arranged apart from the treatment liquid flow path forming portion 62A in the Y-axis direction.
- the irradiation unit 74 is configured to irradiate the irradiation light from the light source 72 toward the processing liquid flow paths 64 of the processing liquid flow path forming sections 62A to 62L.
- the irradiation unit 74 is configured, for example, to individually irradiate the irradiation light toward the processing liquid flow paths 64 of the processing liquid flow path forming sections 62A to 62L.
- the irradiation unit 74 may be arranged below the treatment liquid flow path 64 .
- the irradiation unit 74 has an optical member 82 that is configured to irradiate the processing liquid flow path 64 with irradiation light, for example, by changing the direction of the irradiation light from the light source 72 .
- the optical member 82 includes, for example, a reflecting member 82a, a condenser lens 82b, a neutral density filter 82c, and a trap portion 82d.
- a reflecting surface of the reflecting member 82a faces the light source 72 in the Y-axis direction.
- the reflecting surface of the reflecting member 82a reflects upward the irradiation light emitted from the light source 72 substantially horizontally.
- the condensing lens 82b is arranged above the reflecting member 82a and converges the irradiation light reflected by the reflecting member 82a to the measurement position set in the processing liquid flow path 64. As shown in FIG.
- the condenser lens 82b is configured, for example, so that the measurement position set in the first channel 68a of the treatment liquid channel 64 is irradiated with the irradiation light.
- the condensing position of the condensing lens 82b may be set in consideration of the fact that the path of the irradiation light can be changed by a neutral density filter 82c, which will be described later.
- the light-attenuating filter 82 c functions as a light-attenuating member that attenuates the light emitted from the condensing lens 82 b and emits the light toward the treatment liquid flow path 64 .
- the neutral density filter 82c functions as a light adjustment section that adjusts the amount of light emitted toward the treatment liquid flow path 64.
- an ND (Neutral Density) filter can be used as the dimming filter 82c.
- an ND (Neutral Density) filter can be used as the neutral density filter 82c is shown.
- a predetermined proportion of incident light passes through the ND filter and is emitted toward the processing liquid flow path 64, but part of the light is reflected by the filter.
- the trap portion 82d is provided on the optical path of the light reflected by the neutral density filter 82c.
- a beam trap that absorbs irradiation light can be used as the trap part 82d.
- a beam splitter, for example, is used as the reflective ND filter.
- the light-reducing filter 82c may be provided individually for the processing liquid flow path 64 in each of the processing liquid flow path forming portions 62A to 62L, as shown in FIG.
- the plurality of neutral density filters 82c may be configured to be fixed to the side wall 56a via support members 82e, for example, as shown in FIG.
- the extent to which the light attenuation filter 82c attenuates the irradiation light may be changed according to the characteristics of the treatment liquid flowing through the treatment liquid flow path 64, for example.
- the intensity of the irradiation light emitted from the light attenuation filter 82c toward the processing liquid flow path 64 is adjusted within a range in which the foreign matter detection performance does not deteriorate due to the light attenuation.
- the amount of light can be set to be smaller. Details will be described later.
- the neutral density filter 82c is an ND filter
- a neutral density filter 82c having a different optical characteristic for light reduction from the ND filter may be used.
- a filter having optical characteristics to selectively reduce light in a specific wavelength band may be used as the neutral density filter 82c.
- the optical characteristics of the filter to be selected can also be changed, for example, within a range in which the light receiving unit 76 can sufficiently detect a state in which a foreign substance is mixed in the treatment liquid.
- the plurality of light-attenuating filters 82c may have different light reduction ratios.
- the light attenuation rate of the light attenuation filter 82c corresponding to each treatment liquid flow path 64 may be the same.
- a light attenuation filter 82c having a light attenuation rate corresponding to the type of treatment liquid may be provided.
- optical characteristics different from the light reduction rates of the plurality of light-reducing filters 82c are obtained.
- the configurations may be different from each other.
- Optical properties other than the light attenuation rate include, for example, polarization properties.
- filters having different light attenuation characteristics according to wavelength may be used.
- the holding portion 78 movably holds each member (the reflecting member 82a, the condenser lens 82b, and the trap portion 82d) of the optical member 82 other than the neutral density filter 82c.
- the holding portion 78 has, for example, a guide rail 88 and a slide base 84 .
- the guide rail 88 may be provided on the bottom wall 54b and formed to extend along the direction from the side wall 56c toward the side wall 56d (along the Y-axis direction). For example, as shown in FIG. 7, the guide rail 88 may extend along the Y-axis direction at least between the processing liquid flow path forming portions 62A to 62L.
- the guide rail 88 movably supports the slide base 84 .
- the slide table 84 is arranged below the processing liquid flow path forming portions 62A to 62L and supports the optical member 82 (eg, the reflecting member 82a).
- the slide table 84 is formed so as to extend along a direction intersecting with the guide rail 88 (for example, the X-axis direction).
- the slide table 84 has one end near the side wall 56a located below the processing liquid flow channel forming portion 62A, and the other end near the side wall 56b located below the processing liquid flow channel forming portion 62A. is positioned closer to the side wall 56b than the position of .
- a member of the optical member 82 that is held by the holding portion 78 is arranged at one end portion of the slide table 84 near the side wall 56a.
- the drive unit 80 moves the slide table 84 along the guide rails 88 with a power source such as an electric motor.
- a power source such as an electric motor.
- the light receiving section 76 is configured to receive light emitted from the treatment liquid flow path 64 by the irradiation of the irradiation light from the irradiation section 74 .
- the light receiving section 76 may be arranged so as to sandwich the processing liquid flow path forming sections 62A to 62L with the side wall 56a.
- the light receiving section 76 includes an optical member 92 and a light receiving element 94, for example.
- the processing liquid flow path forming portion 62A, the optical member 92, and the light receiving element 94 are arranged in this order.
- the height positions of the optical member 92 and the light receiving element 94 may substantially match the height position of the first channel 68a of the treatment liquid channel 64, for example.
- the optical member 92 includes, for example, a condensing lens that collects the light emitted from the processing liquid flow path 64 toward the light receiving element 94 .
- a wavelength filter may be provided inside the optical member 92 to pass only light having a specific wavelength.
- the light receiving element 94 receives the light condensed by the optical member 92 and generates an electrical signal corresponding to the received light (detection light).
- the light receiving element 94 includes, for example, a photodiode that performs photoelectric conversion.
- the optical member 92 and the light receiving element 94 are attached to a support member 86 extending along the vertical direction.
- the support member 86 is connected to the slide base 84 .
- the lower end of the support member 86 is connected to the end of the slide base 84 opposite to the end where the optical member 82 is provided.
- the optical member 92 and the light receiving element 94 are moved along the Y-axis direction.
- the drive unit 80 moves the slide base 84 to move the irradiation unit 74 (of which the optical member 82 held by the holding unit 78) and the light receiving unit 76 together along the Y-axis direction. move.
- the drive unit 80 has, for example, a position where the irradiation unit 74 and the light receiving unit 76 face the treatment liquid flow path forming part 62A, and a position where the irradiation part 74 and the light receiving part 76 face the treatment liquid flow path forming part 62L. , the irradiation unit 74 and the light receiving unit 76 are moved between.
- the position where the irradiation unit 74 and the light receiving unit 76 face one of the processing liquid flow channel forming portions is referred to as a position corresponding to the processing liquid flow channel forming portion.
- the driving unit 80 moves the optical member below any one of the processing liquid flow paths 64 of the processing liquid flow path forming sections 62A to 62L. 82 moves, the processing liquid flow path 64 is irradiated with irradiation light from the irradiation unit 74 .
- the irradiation light that irradiates the processing liquid flow path 64 is light that has been attenuated by the light-reducing filter 82 c provided below the processing liquid flow path 64 .
- the light receiving element 94 receives the light emitted from the processing liquid flow path 64 when the irradiation light is applied.
- the irradiation section 74 is arranged below the measurement position set in the processing liquid flow path 64, and the light receiving section 76 is arranged on the side of the measurement position. Therefore, when the treatment liquid flow path 64 is irradiated with the irradiation light, the light receiving unit 76 receives part of the light (scattered light) generated by scattering the irradiation light at the measurement position in the treatment liquid flow path 64. receive light.
- scattered light is generated due to the components of the treatment liquid regardless of the presence or absence of foreign matter.
- the solution contains no foreign matter, most of the irradiation light passes through the treatment liquid flow path 64 .
- the degree of scattering of the irradiation light in the treatment liquid flow path 64 increases, and the light received by the light receiving unit 76 ( A portion of the scattered light directed toward the light receiving section 76) has an increased intensity.
- the foreign object detection unit 50 may further include a heat sink 58, as shown in FIG.
- a heat sink 58 may be provided outside the housing 52 .
- the heat sink 58 may be provided, for example, at a position corresponding to the light source 72 on the outer surface of the bottom wall 54b.
- the heat sink 58 may be a water cooled heat sink.
- the heat sink 58 prevents the temperature inside the housing 52 from rising due to the optical members such as the light source 72 . This reduces the influence of the heat generated by the optical members such as the light source 72 on the treatment liquid (substrate treatment).
- the foreign object detection unit 50 may further have a control section 100 .
- the control section 100 controls each element of the foreign object detection unit 50 .
- the control unit 100 is arranged inside the housing 52, for example.
- the control unit 100 includes, for example, a signal acquisition unit 102, a foreign object determination unit 104, a processing information acquisition unit 106, as a functional configuration (hereinafter referred to as a "functional module"). It has a drive control section 108 and an output section 110 . Furthermore, the control unit 100 has a noise evaluation unit 112 and a light amount adjustment unit 114 . Note that the processing executed by the signal acquisition unit 102, the foreign object determination unit 104, the processing information acquisition unit 106, the drive control unit 108, the output unit 110, the noise evaluation unit 112, and the light amount adjustment unit 114 is the same as the processing executed by the control unit 100. corresponds to
- the signal acquisition unit 102 acquires an electrical signal corresponding to the intensity of the detected light from the light receiving unit 76.
- the signal acquisition unit 102 generates an electric signal corresponding to the intensity of light emitted from the processing liquid flow path 64 (first flow path 68a) through which the processing liquid to be monitored flows among the processing liquid flow path forming sections 62A to 62L.
- a signal is obtained from the light receiving element 94 .
- the signal acquisition unit 102 acquires, for example, an electrical signal having an amplitude corresponding to the intensity of detected light.
- the foreign matter determination unit 104 detects the presence or absence of foreign matter in the treatment liquid based on the intensity (hereinafter referred to as "signal intensity") such as the amplitude of the electric signal corresponding to the detected light.
- FIG. 9 shows a graph showing an example of temporal changes in signal intensity obtained from the signal acquisition unit 102 .
- the foreign matter determination unit 104 determines that the treatment liquid contains foreign matter when the signal intensity is greater than a predetermined threshold value Th.
- the foreign matter determination unit 104 determines that the treatment liquid does not contain any foreign matter when the signal intensity is equal to or less than a predetermined threshold value Th.
- the threshold Th is a value that is set in advance in consideration of the intensity of scattered light when the irradiation light is scattered by foreign matter in the treatment liquid.
- the noise evaluation unit 112 identifies noise components from the electrical signal corresponding to the intensity of the detected light.
- the light amount adjustment unit 114 has a function of adjusting the light amount of light with which the treatment liquid is irradiated, based on the result of specifying the noise component by the noise evaluation unit 112 .
- the signal intensity obtained from the signal acquisition unit 102 includes noise components N that fluctuate below the threshold Th in addition to those that exceed the threshold Th.
- the noise component N may include instrument noise and haze noise.
- the equipment noise is a fixed component derived from the electric circuit of the apparatus, etc., and can be noise of constant intensity regardless of the intensity of the light irradiated to the treatment liquid flow path 64 . Therefore, in this embodiment, equipment noise may be referred to as stationary noise.
- haze noise is a component that is generated due to the components of the treatment liquid.
- An electric signal transmitted from the light receiving element 94 when the scattered light originating from the components of the treatment liquid is incident on the light receiving element 94 corresponds to haze noise. Since haze noise is not an electrical signal indicating the presence of foreign matter, a threshold value Th for determining the presence or absence of foreign matter can be set so that haze noise is not detected as a detection result of foreign matter.
- FIG. 10 schematically shows how the signal intensity of each noise and the intensity of the electric signal indicating the presence of foreign matter change when the intensity of the irradiation light to the treatment liquid flow path 64 is changed. It is.
- FIG. 10(a) shows a state in which three signals PS1 to PS3 related to foreign matter are detected based on the light from the treatment liquid flow path 64.
- FIG. FIG. 10(a) also shows instrument noise and haze noise.
- the example shown in FIG. 10A shows a situation where the haze noise level is higher than the equipment noise level.
- the signal PS3 is buried in haze noise. Therefore, in practice, the signal PS3 is not recognized as a signal derived from a foreign object by the foreign object determination unit 104, and is part of the noise. can be recognized as a part. That is, in the example shown in FIG. 10(a), only the signals PS1 and PS2 can be recognized as the foreign object detection signals.
- FIG. 10B shows how the intensity of the signal detected based on the light from the processing liquid flow path 64 changes when the intensity of the irradiation light is reduced.
- the signals PS1 to PS3 and the haze noise level all decrease as the intensity of the irradiation light decreases.
- the intensity of the scattered light is proportional to the intensity of the illuminating light, each signal intensity also changes while maintaining the proportional relationship according to the change in the illuminating light.
- each signal strength decreases while the strength relationship between the signals PS1 to PS3 and the haze noise level is substantially maintained, as shown in FIG. 10(b). Therefore, even if the intensity of the irradiation light is reduced until the haze noise level becomes substantially equal to the equipment noise level, the signals PS1 and PS2 can be distinguished from the noise components (haze noise and equipment noise). Detection accuracy can be maintained.
- the condition under which the level of haze noise is substantially equal to the level of device noise is defined as the minimum amount of irradiation light under the condition that the detection accuracy is maintained. Then, the amount of light is adjusted by the light reducing filter 82c and the like so that the treatment liquid flow path 64 can be irradiated with the irradiation light under such conditions.
- the noise evaluation unit 112 and the light amount adjustment unit 114 described above have a function of adjusting the amount of light with which the treatment liquid flow path 64 is irradiated using the above method. Specifically, the noise evaluation unit 112 has a function of identifying the haze noise component and the device noise component from the already measured signal strength measurement results. Also, the light amount adjustment unit 114 has a function of calculating the light amount of the dimmable irradiation light based on the component specified by the noise evaluation unit 112 .
- the haze noise component is a component that can fluctuate depending on the light intensity of the irradiation light.
- the light amount adjustment unit 114 may repeatedly perform measurements while reducing the light amount of the irradiation light, and specify the state in which the fluctuation of the noise component N becomes small as the minimum light amount of the irradiation light.
- a state in which the amount of light is slightly increased compared to the minimum amount of light may be set as the appropriate amount of irradiation light.
- the noise evaluation unit 112 and the light intensity adjustment unit 114 specify the relationship between the haze noise component and the device noise component, and determine the intensity of the irradiation light after dimming within a range in which the device noise component does not affect the foreign matter detection accuracy. can be set.
- the result of light amount adjustment by the noise evaluation unit 112 and the light amount adjustment unit 114 may be configured to be output from the output unit 110 to the control device 18 . Further, based on the results of light amount adjustment by the noise evaluation unit 112 and the light amount adjustment unit 114, the drive control unit 108 may be controlled to adjust the light amount.
- the processing information acquisition unit 106 acquires information on the processing executed in the liquid processing unit U1 (hereinafter referred to as "processing information") from the control device 18.
- the processing information includes, for example, information indicating the nozzle (processing liquid to be monitored) from which ejection is performed in the liquid processing unit U1, and information indicating the supply start timing and supply time of the processing liquid.
- the processing information acquisition unit 106 may acquire the processing information from the control device 18 before the supply of the processing liquid is started for each processing using one processing liquid.
- the drive control unit 108 moves the irradiation unit 74 and the light receiving unit 76 by moving the slide table 84 with the driving unit 80 between the treatment liquid flow path forming units 62A to 62L. For example, according to the processing liquid indicated by the processing information, the drive control unit 108 causes the driving unit 80 to move the processing liquid flow path formation units 62A to 62L to a position corresponding to the processing liquid flow path 68 through which the processing liquid passes. The irradiation section 74 and the light receiving section 76 are moved.
- the drive control unit 108 moves the irradiation unit 74 and the light receiving unit 76 to predetermined standby positions by the driving unit 80, for example, when the treatment liquid flow path 64 is not irradiated with irradiation light.
- the standby position may be set at a position that does not overlap the processing liquid flow path forming portions 62A to 62L.
- the drive control unit 108 controls the drive unit 80 so that the treatment liquid flow path 68 is irradiated with the irradiation light during at least part of the period in which the treatment liquid is supplied to the workpiece W. At least part of the period in which no processing liquid is supplied to the workpiece W, the drive control section 108 directs the irradiation light toward a position different from the processing liquid flow path 64 of the processing liquid flow path forming sections 62A to 62L at the standby position.
- the driving unit 80 is controlled so that is irradiated.
- the output unit 110 outputs the result of determination by the foreign object determination unit 104 to the outside of the foreign object detection unit 50 .
- the output unit 110 may output the determination result to the control device 18, or may output it to a display or the like that notifies the operator of the result. For example, when the foreign matter determination unit 104 determines that the foreign matter is included, the output unit 110 may output an alarm signal indicating that the processing liquid to be monitored includes the foreign matter.
- the output unit 110 may also output the results of the light amount adjustment by the noise evaluation unit 112 and the light amount adjustment unit 114 to the control device 18 .
- the control unit 100 is composed of one or more control computers.
- the control section 100 has a circuit 200 shown in FIG. Circuit 200 includes one or more processors 202 , memory 204 , storage 206 , input/output ports 208 and timer 212 .
- the storage 206 has a computer-readable storage medium such as a hard disk.
- the storage medium stores a program for causing the control unit 100 to execute an operation confirmation method, which will be described later.
- the storage medium may be a removable medium such as a non-volatile semiconductor memory, a magnetic disk and an optical disk.
- the memory 204 temporarily stores the program loaded from the storage medium of the storage 206 and the calculation result by the processor 202 .
- the processor 202 configures each functional module by cooperating with the memory 204 to execute the above program.
- the input/output port 208 inputs/outputs electric signals to/from the control device 18, the light receiving section 76, the driving section 80, etc. according to the instructions from the processor 202.
- the timer 212 measures the elapsed time by, for example, counting reference pulses of a constant cycle.
- the hardware configuration of the control unit 100 is not necessarily limited to configuring each functional module by a program.
- each functional module of the control unit 100 may be composed of a dedicated logic circuit or an ASIC (Application Specific Integrated Circuit) integrated with this.
- FIG. 12 is a flow chart showing an example of a foreign matter detection method.
- step S01 the driving control unit 108 causes the driving unit 80 to move the slide table 84 to a position corresponding to the processing liquid channel 64 through which the processing liquid to be monitored indicated by the processing information flows, thereby causing the irradiation unit 74 and the irradiation unit 74 to move.
- the light receiving section 76 is moved.
- the irradiation unit 74 irradiates the processing liquid channel 64 through which the monitoring target processing liquid flows, and the light receiving unit 76 receives the light emitted from the processing liquid channel 64 .
- step S ⁇ b>02 for example, the signal acquisition unit 102 acquires signal intensity corresponding to the detected light received by the light receiving unit 76 .
- step S03 for example, the foreign object determination unit 104 determines whether the signal intensity obtained in step S02 is greater than the threshold value Th.
- step S03 when it is determined that the signal intensity is greater than the threshold Th (step S03: YES), control unit 100 executes step S04.
- step S04 for example, the output unit 110 outputs an alarm signal indicating that foreign matter is contained in the processing liquid to be monitored.
- step S03: NO the control unit 100 does not execute step S04.
- step S05 the control unit 100 determines whether or not the supply of the processing liquid to be monitored has ended.
- the control unit 100 may determine whether or not the supply of the treatment liquid has ended by measuring the elapsed time from the supply start timing included in the treatment information.
- step S05: NO the control section 100 repeats the processes of steps S02 and S03. As a result, during the supply period of the processing liquid, the monitoring of whether the processing liquid contains foreign matter is continued.
- step S05 When it is determined in step S05 that the supply of the processing liquid to be monitored has ended (step S05: YES), the control section 100 executes step S06.
- step S06 the control unit 100 determines whether or not there is a waiting time based on the supply start timing (hereinafter referred to as "next supply start timing") for the processing liquid to be monitored next. As an example, when the time until the next supply start timing is longer than the predetermined time, it is determined that there is a standby time, and the control section 100 executes step S07.
- step S07 for example, the drive control unit 108 causes the drive unit 80 to move the irradiation unit 74 and the light receiving unit 76 to the standby position.
- step S08 the control unit 100 waits until the timing to start monitoring the processing liquid to be monitored next. For example, the control unit 100 waits until the time until the next supply start timing becomes shorter than the predetermined time.
- step S08 if it is time to start monitoring the next processing liquid to be monitored (step S08: YES), or if it is determined that there is no waiting time in step S06 (step S06: NO), the control unit 100 repeats the processing of steps S01 to S06.
- FIG. 13 is a flow chart showing an example of a method for adjusting the amount of light.
- step S11 the driving control unit 108 causes the driving unit 80 to move the slide table 84 to a position corresponding to the processing liquid channel 64 through which the processing liquid to be monitored indicated by the processing information flows, thereby causing the irradiation unit 74 and the irradiation unit 74 to move.
- the light receiving section 76 is moved.
- the irradiation unit 74 irradiates the processing liquid channel 64 through which the monitoring target processing liquid flows, and the light receiving unit 76 receives the light emitted from the processing liquid channel 64 .
- the signal acquisition unit 102 acquires signal intensity corresponding to the detection light received by the light receiving unit 76 .
- the measurement result obtained in this manner is the measurement result for a specific amount of light. If necessary, the control unit 100 repeats step S11 to acquire measurement results under a plurality of conditions with mutually different amounts of light.
- step S12 the noise evaluation unit 112 identifies the device noise component and the haze noise component from the signal intensity information obtained in step S11.
- the level of the haze noise component may be specified based on whether there is a difference in the level of the noise component N in the results of measurement conditions with two levels of light intensity. Note that in step S12, the device noise component and the haze noise component may not be clearly distinguished from each other. As an example, in step S12, the degree of the noise component N may be specified.
- the noise component N when the magnitude of the device noise component is known, for example, if the noise component N is greater than the magnitude of the device noise component, it indicates that the haze noise component is greater than the device noise component.
- the haze noise component may be estimated from such information. It is also possible to directly measure the noise component N from the result when the amount of light is zero.
- step S13 the control unit 100 executes step S13.
- the light amount adjustment unit 114 determines whether the instrument noise level and the haze noise level are approximately the same level in the measurement result of the specific light amount. While the instrument noise level is uniform, the haze noise level fluctuates according to the amount of light. Therefore, it may be determined whether the device noise level and the haze noise level are approximately the same level based on whether the level of the noise component N changes when the light quantity is changed (decreased).
- step S14 the light amount adjustment unit 114 of the control unit 100 may set the light amount of the irradiation light applied to the treatment liquid flow path 64 one step lower.
- the above steps S11 to S13 may be repeated under the condition that the light intensity is lowered by one step.
- step S15 the light amount adjustment unit 114 of the control unit 100 may estimate that the amount of irradiation light with which the processing liquid flow path 64 is irradiated is the minimum condition. Further, in step S16, for example, the light amount adjustment unit 114 may set a condition in which the light amount is slightly increased with respect to the minimum condition as the measurement condition.
- the measurement conditions refer to the amount of light used when detecting foreign matter in the treatment liquid. As the measurement condition, the minimum condition of the light amount may be adopted, but a state in which the light amount is slightly increased from the minimum condition may be adopted in consideration of a minute change in the light amount.
- the procedure for adjusting the amount of light shown in FIG. 13 can be performed for each treatment liquid, for example. Since the components in the processing liquid change depending on the processing liquid, the level of haze noise may also fluctuate. Also, the amount of light may be adjusted for each processing liquid flow path 64 . The level of haze noise may fluctuate due to, for example, a change in the processing liquid flow path 64, so performing the above procedure for each processing liquid flow path 64 makes it possible to adjust the amount of light in more detail. can.
- FIG. 14 is a diagram showing another example of a dimming member functioning as a light adjusting section.
- FIG. 14 shows an example in which a beam splitter 82f, which is a dimming member, is provided on the optical path instead of the reflecting member 82a. In this case, part of the light split by the beam splitter 82f is emitted toward the treatment liquid flow path 64.
- FIG. The other light beam split by the beam splitter 82f (light traveling in a direction different from the treatment liquid flow path 64) may be absorbed in a trap section (not shown).
- the beam splitter 82f is held by the holding portion 78 in the same manner as other members included in the irradiation portion 74, and moves in the Y-axis direction as the slide table 84 moves along the guide rail 88. do.
- the configuration and arrangement of the dimming member can be changed as appropriate.
- a configuration in which the dimming member is arranged between the light source 72 and the reflecting member 82a may be employed.
- a configuration may be adopted in which any one of a plurality of dimming members having different optical characteristics can be selected and placed in the optical path.
- a configuration may be adopted in which a plurality of light reducing members are installed on the revolver, and any one of the light reducing members is arranged on the optical path by rotating the revolver.
- a plurality of dimming members may be arranged on the optical path, and the illumination light may be optimized by using a plurality of dimming members.
- the light source 72 itself may be configured to have a light adjustment function.
- the intensity of light emitted from the light source 72 may be adjustable.
- the foreign matter detection unit 50 can be provided with a configuration related to various dimming members as described above, it may be configured to adjust the amount of light irradiated to the treatment liquid flow path 64 by combining these.
- the treatment liquid flow path 64 is irradiated. It is possible to adjust the amount of light with which the plurality of treatment liquid flow paths 64 are irradiated.
- the irradiation unit 74 may be capable of irradiating irradiation light toward each of the plurality of processing liquid flow paths 64 by moving relative to the plurality of processing liquid flow paths 64 .
- the light adjustment section may be provided on the optical path leading to each of the plurality of treatment liquid flow paths 64 . In this case, since it is possible to individually adjust the amount of light for each processing liquid flow path, it is possible to flexibly adjust the amount of light.
- the light adjustment unit adjusts the irradiation light based on the noise component contained in the light received by the light receiving unit 76 when one of the plurality of processing liquid flow paths 64 is irradiated with the irradiation light. You may adjust the light quantity of light. Specifically, under the condition that the intensity of the stationary noise component generated regardless of the intensity of the irradiation light is not less than the intensity of the stationary noise component, the intensity of the haze noise component that varies according to the intensity of the irradiation light is adjusted to approach the intensity of the stationary noise. The amount of irradiation light applied to the treatment liquid flow path 64 may be adjusted.
- the haze noise component is a component that varies according to the intensity of the irradiation light. Therefore, by adjusting the intensity of the irradiation light so that it approaches the intensity of the stationary noise component, it is possible to reduce the intensity of the irradiation light while preventing deterioration in the accuracy of foreign matter detection. It is possible to efficiently detect foreign matter according to the conditions.
- a control unit 100 that acquires an electrical signal corresponding to the intensity of the light received by the light receiving unit 76 may be further provided.
- the control unit 100 controls the intensity of the stationary noise component and the haze value based on the electrical signal corresponding to the light received by the light receiving unit 76 when the irradiation light is applied to one processing liquid flow path 64.
- the intensity of the noise component may be estimated.
- the light adjustment unit adjusts the intensity of the haze noise component, which varies according to the intensity of the irradiation light, to the intensity of the stationary noise. You may adjust the light quantity of the irradiated light to irradiate.
- the intensity of the stationary noise component and the intensity of the haze noise component are estimated based on the electrical signal corresponding to the light received by the light receiving unit 76, and the light intensity of the irradiation light is based on the results. is adjusted. Therefore, the intensity of irradiation light can be adjusted more accurately.
- the control unit 100 determines the intensity of the stationary noise component and the haze noise component from the electric signal corresponding to the light received by the light receiving unit 76 when the treatment liquid flow path 64 is irradiated with different amounts of irradiation light. It is good also as an aspect which estimates the intensity
- the intensity of the haze noise component can vary depending on the intensity of the irradiation light. Therefore, by estimating the intensity of the stationary noise component and the intensity of the haze noise component based on the difference in the light received by the light receiving unit 76 when irradiating different amounts of irradiation light, the haze noise component and the stationary noise can be obtained. It becomes possible to more accurately estimate the relationship with the component.
- the foreign object detection procedure according to the above-described embodiment is an example, and the order of steps, execution timing, execution contents, etc. can be changed as appropriate.
- the configuration of the foreign object detection device can be changed as appropriate.
- at least part of the processing liquid flow path 64 flowing through the block body 66 may be formed to extend in a direction other than the horizontal direction and the vertical direction.
- the inflow port 64a and the outflow port 64b of the processing liquid channel 64 may be formed on different surfaces of the block body.
- the processing liquid flow path forming portions 62A to 62L may include liquid passage tubes for supplying the processing liquid.
- the processing liquid flow path 64 may be a flow path within a liquid passage tube for supply.
- These liquid-passing tubes may be made of a material (for example, quartz or sapphire) that can transmit irradiation light.
- the foreign matter detection unit 50 may have one processing liquid flow channel forming portion instead of the processing liquid flow channel forming portions 62A to 62L.
- the processing liquid flow path forming portions 62A to 62L may be arranged along the Y-axis direction at substantially the same intervals, or may be arranged at different intervals. Further, one or a plurality of dummy channel forming portions that are not used for processing may be arranged as part of the processing liquid channel forming portions.
- the optical characteristics of the light-reducing filter 82c can be selected according to the characteristics of the treatment liquid as described above. May be placed on the road. For example, in some cases, such as when the treatment liquid is thinner, the dimming member may not be provided. In this case, if the plurality of processing liquid flow paths 64 are not provided with a light reducing member, there is a possibility that the optical path length will differ between the processing liquid flow paths. On the other hand, by arranging an optical filter having no dimming function on the optical path in the same manner as the other processing liquid flow paths 64, the optical path length can be made uniform.
- the foreign object detection unit 50 may include an irradiation drive section that moves the irradiation section 74 along the Y-axis direction, and a light reception drive section that moves the light receiving section 76 along the Y-axis direction. These two driving units may be configured to move the irradiation unit 74 and the light receiving unit 76 along the Y-axis direction. Furthermore, an X-axis direction driving section may be provided to move the light receiving section 76 along the X-axis direction.
- the irradiation unit 74 may include the light source 72 and the treatment liquid flow paths 64 may be irradiated with the irradiation light without passing through the optical member 82 .
- the light receiving unit 76 may receive part of the transmitted light obtained by the irradiation light from the irradiation unit 74 passing through the treatment liquid flow path 64 .
- the irradiation section 74 and the light receiving section 76 may be arranged so as to sandwich the treatment liquid flow path forming sections 62A to 62L in the vertical direction (Z-axis direction).
- the specific configuration of the substrate processing apparatus is not limited to the configuration of the coating/developing apparatus 2 illustrated above. Any substrate processing apparatus may be used as long as it includes a foreign matter detection unit 50 for detecting foreign matter in the processing liquid supplied to the substrate.
- the processing liquid that is the target liquid for foreign matter detection by the foreign matter detection unit 50 may be a solution for forming a film other than the resist film (for example, the lower layer film or the upper layer film described above), or may be a solution for substrate processing other than film formation. It may be a solution. All or part of the functional modules of the controller 100 of the foreign object detection unit 50 may be executed by the controller 18 . In this case, the foreign object detection unit 50 and the control device 18 may constitute a foreign object detection device.
- Substrate processing system 2 Coating/developing device 3 Exposure device 32, 32A to 32L Nozzle 50 Foreign matter detection unit (foreign matter detection device) 52 Case 54a Top wall 54b Bottom Wall 56a to 56d side wall 60 flow path forming part 62A to 62L treatment liquid flow path forming part 64 treatment liquid flow path 70 measurement part 72 light source 74 irradiation part 76 light receiving Part 78... Holding part 80... Driving part 82... Optical member 82a... Reflecting member 82b... Condensing lens 82c... Neutralizing filter 82d... Trap part 82e... Supporting member 82f... Beam splitter 84 ... slide table 86... support member 88... guide rail 92... optical member 94... light receiving element 100... control unit 102... signal acquisition unit 104... foreign object determination unit 106... processing information acquisition unit 108... Drive control unit 110 Output unit 112 Noise evaluation unit 114 Light amount adjustment unit.
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- Cleaning Or Drying Semiconductors (AREA)
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Abstract
Description
図1に示される基板処理システム1(基板処理装置)は、ワークWに対し、感光性被膜の形成、当該感光性被膜の露光、及び当該感光性被膜の現像を施すシステムである。処理対象のワークWは、例えば基板、あるいは所定の処理が施されることで膜又は回路等が形成された状態の基板である。ワークWに含まれる基板は、一例として、シリコンを含むウェハである。ワークW(基板)は、円形に形成されていてもよい。処理対象のワークWは、ガラス基板、マスク基板、FPD(Flat Panel Display)などであってもよく、これらの基板等に所定の処理が施されて得られる中間体であってもよい。感光性被膜は、例えばレジスト膜である。
以下、基板処理装置の一例として、塗布・現像装置2の構成を説明する。図1及び図2に示されるように、塗布・現像装置2は、キャリアブロック4と、処理ブロック5と、インタフェースブロック6と、制御装置18とを備える。
続いて、図3及び図4を参照して液処理ユニットU1の一例を詳細に説明する。ここでは、レジスト膜を形成する処理モジュール12における液処理ユニットU1(処理液供給ユニット)を例に説明する。液処理ユニットU1は、図3に示されるように、回転保持部20と、処理液供給部30とを有する。
塗布・現像装置2は、ワークWに供給される処理液に含まれる異物(パーティクル)を検出するように構成された異物検出ユニット50(異物検出装置)を更に備える。異物検出ユニット50は、例えば、複数の供給管42A~42Lの流路を流れる処理液内の異物をそれぞれ検出するように構成されている。異物検出ユニット50は、液処理ユニットU1の近傍に配置されてもよく、液処理ユニットU1の筐体内に配置されてもよい。異物検出ユニット50の一部の要素は、供給管42A~42Lの流路上の開閉バルブVとノズル32A~32Lとの間に設けられてもよい。以下では、図5~図11も参照して、異物検出ユニット50の一例について説明する。
続いて、図12を参照して、異物検出ユニット50において実行される異物検出方法(異物検出手順)について説明する。図12は、異物検出方法の一例を示すフローチャートである。
続いて、図13を参照して、異物検出ユニット50において実行される光量の調整方法について説明する。図13は、光量の調整方法の一例を示すフローチャートである。
図14は、光調整部として機能する減光部材の別の例を示す図である。図14では、減光部材であるビームスプリッタ82fが、反射部材82aの代わりに光路上に設けられている例を示している。この場合、ビームスプリッタ82fによって分光された光の一部が処理液流路64へ向けて出射される。なお、ビームスプリッタ82fによって分光された他方の光(処理液流路64とは異なる方向へ向かう光)は、図示しないトラップ部において吸収される構成としてもよい。図14に示す構成の場合、照射部74に含まれる他の部材と同様にビームスプリッタ82fも保持部78によって保持され、ガイドレール88に沿ったスライド台84の移動に伴ってY軸方向に移動する。
上記の異物検出装置及び異物検出方法によれば、光源72から出射された光が照射部74に含まれる光調整部として機能する減光フィルタ82c(またはビームスプリッタ82f)によって光量が調整された後に、処理液流路64に対して照射される。複数の処理液流路64に対して照射する光の光量を調整することができる。したがって、複数の処理液流路において互いに異なる特性の処理液が通流する場合や、流速・流量などの通流条件が異なる場合に、その複数の処理液流路に対して照射する光の光量を調整することができるため、それぞれの処理液流路64内の処理液の状態に応じた効率的な異物検出が可能となる。
以上、種々の例示的実施形態について説明してきたが、上述した例示的実施形態に限定されることなく、様々な省略、置換、及び変更がなされてもよい。また、異なる実施形態における要素を組み合わせて他の実施形態を形成することが可能である。
Claims (6)
- 基板処理用の処理液に含まれる異物を検出するように構成された異物検出装置であって、
基板に供給される前記処理液が流れる処理液流路を形成する、複数の処理液流路形成部と、
前記複数の処理液流路のそれぞれに向けて光源からの照射光を個別に照射可能に構成された照射部と、
前記照射光の照射によって前記処理液流路から出射される光を受光するように構成された受光部と、
を有し、
前記照射部は、前記複数の処理液流路を照射する前記照射光の光量を互いに異ならせる光調整部を含む、異物検出装置。 - 前記照射部は前記複数の処理液流路に対して相対的に移動することで、前記複数の処理液流路のそれぞれに向けて前記照射光を照射可能とされ、
前記光調整部は、前記複数の処理液流路のそれぞれに向かう光路上に設けられる、請求項1に記載の異物検出装置。 - 前記光調整部は、前記複数の処理液流路のうちの一の処理液流路に対して前記照射光を照射した際に前記受光部において受光される光に含まれるノイズ成分のうち、前記照射光の強度によらず発生する定常ノイズ成分の強度を下回らない条件で、前記照射光の強度に応じて変動するヘイズノイズ成分の強度を前記定常ノイズの強度に近付けるように、前記一の処理液流路に対して照射する前記照射光の光量を調整する、請求項1または2に記載の異物検出装置。
- 前記受光部において受光した光の強度に応じた電気信号を取得する制御部をさらに有し、
前記制御部は、前記一の処理液流路に対して前記照射光を照射した際に前記受光部において受光される光に対応した電気信号に基づいて、前記定常ノイズ成分の強度と前記ヘイズノイズ成分の強度とを推定し、
前記光調整部は、前記制御部における推定結果に基づいて、前記照射光の強度に応じて変動するヘイズノイズ成分の強度を前記定常ノイズの強度に近付けるように、前記一の処理液流路に対して照射する前記照射光の光量を調整する、請求項3に記載の異物検出装置。 - 前記制御部は、前記一の処理液流路に対して互いに異なる光量の前記照射光を照射した際に前記受光部において受光される光に対応した電気信号から、前記定常ノイズ成分の強度と前記ヘイズノイズ成分の強度とを推定する、請求項4に記載の異物検出装置。
- 基板処理用の処理液に含まれる異物を検出するように構成された異物検出装置における異物検出方法であって、
基板に供給される前記処理液が流れる複数の処理液流路に向けて光源からの照射光をそれぞれ照射部によって照射することと、
前記照射光の照射によって前記処理液流路から出射される光を受光部によって受光することと、
を含み、
前記照射部は、光調整部によって前記複数の処理液流路を照射する前記照射光の光量を互いに異ならせる、異物検出方法。
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US20180128733A1 (en) * | 2016-11-07 | 2018-05-10 | Applied Materials, Inc. | Methods and apparatus for detection and analysis of nanoparticles from semiconductor chamber parts |
WO2020071273A1 (ja) * | 2018-10-05 | 2020-04-09 | 株式会社Provigate | 微量物質用光学測定器及び測定方法 |
WO2021182117A1 (ja) * | 2020-03-09 | 2021-09-16 | 東京エレクトロン株式会社 | 異物検出装置、基板処理装置、異物検出方法、及び記憶媒体 |
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JPH01321324A (ja) * | 1988-06-24 | 1989-12-27 | Shimadzu Corp | 複数試料の測定が可能な分光光度計 |
WO2013140617A1 (ja) * | 2012-03-23 | 2013-09-26 | 株式会社島津製作所 | 検出器及びその検出器を備えた液体クロマトグラフ |
US20180128733A1 (en) * | 2016-11-07 | 2018-05-10 | Applied Materials, Inc. | Methods and apparatus for detection and analysis of nanoparticles from semiconductor chamber parts |
WO2020071273A1 (ja) * | 2018-10-05 | 2020-04-09 | 株式会社Provigate | 微量物質用光学測定器及び測定方法 |
WO2021182117A1 (ja) * | 2020-03-09 | 2021-09-16 | 東京エレクトロン株式会社 | 異物検出装置、基板処理装置、異物検出方法、及び記憶媒体 |
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