US20100290014A1 - Supporting plate, stage device, exposure apparatus, and exposure method - Google Patents
Supporting plate, stage device, exposure apparatus, and exposure method Download PDFInfo
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- US20100290014A1 US20100290014A1 US12/805,328 US80532810A US2010290014A1 US 20100290014 A1 US20100290014 A1 US 20100290014A1 US 80532810 A US80532810 A US 80532810A US 2010290014 A1 US2010290014 A1 US 2010290014A1
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- substrate
- fluid
- supporting plate
- liquid
- exposure
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70691—Handling of masks or workpieces
- G03F7/70716—Stages
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70216—Mask projection systems
- G03F7/70341—Details of immersion lithography aspects, e.g. exposure media or control of immersion liquid supply
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70691—Handling of masks or workpieces
- G03F7/707—Chucks, e.g. chucking or un-chucking operations or structural details
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/7095—Materials, e.g. materials for housing, stage or other support having particular properties, e.g. weight, strength, conductivity, thermal expansion coefficient
Definitions
- This invention relates to a supporting plate, a stage device, an exposure device, and an exposure method, and particularly to a supporting plate which is advantageously used with respect to a substrate on a stage, a stage device, an exposure apparatus, and an exposure method, at the time of exposure via a projection optical system that utilizes a liquid immersion technique.
- a semiconductor device and a liquid crystal display device are manufactured by a so-called photolithographic method which transfers a pattern formed on a mask onto a photosensitive substrate.
- An exposure apparatus which is used in this photolithographic method is provided with a mask stage which supports a mask, and a substrate stage which supports a substrate.
- the exposure apparatus transfers a mask pattern onto a substrate via a projection optical system while successively moving the mask stage and the substrate stage.
- the resolution of the projection optical system increases as an exposure wavelength which is used becomes shorter and a numerical aperture of the projection optical system becomes larger. Because of this, the exposure wavelength which is used in exposure apparatus has become shortened over the years, and the numerical aperture of projection optical systems has increased.
- an exposure wavelength of 248 nm of a KrF excimer laser is currently the mainstream, but an exposure wavelength of 139 nm of an ArF excimer laser also has been put into practice.
- a depth of focus (DOF) also becomes important as well as the resolution.
- the resolution R and the depth of focus ⁇ can be expressed by the following equations.
- ⁇ is an exposure wavelength
- NA is a numerical aperture of the projection optical system
- k1, k2 are process coefficients.
- a liquid immersion method has been proposed, as disclosed in, e.g., WO99/49504, as a method which substantially shortens an exposure wavelength and broadens the depth of focus.
- This liquid immersion method forms a liquid immersion area by filling the space between a lower surface of the projection optical system and a substrate surface with liquid such as water, an organic solvent, or the like, and improves the resolution by taking advantage of the fact that the wavelength of the exposure light in liquid becomes 1/n (n is normally approximately 1.2 through 1.6 depending on the index of refraction of the liquid) as compared to the wavelength in air, and increases the depth of focus by approximately n-times.
- exposure is performed in a state in which liquid is filled between a projection optical system and a wafer, so there are cases in which liquid may be splashed to locations external of the wafer if an unexpected operation is performed due to errors when a stage moves.
- liquid is supplied between a projection optical system and a wafer by a liquid supply mechanism, and the supplied liquid is collected from the space between the wafer and the projection optical system by a liquid collection mechanism using vacuum suction or the like.
- a liquid collection mechanism using vacuum suction or the like.
- a supporting plate includes a support surface which supports an object, and the supporting plate is made to be liquid repellent.
- a collection device is arranged to collect liquid from the supporting plate.
- the supporting plate of this embodiment of the invention even when the liquid is splashed or discharged to the supporting plate, this liquid can be collected by the collection device. Therefore, it is possible to suppress problems such as device/member failure, leaking, rust/oxidation, etc., or to reduce the effects of such problems.
- the supporting plate is liquid repellent, so the splashed or discharged liquid cannot be spread over the support surface, and can easily move off the plate. Thus, a collection operation can be performed easily.
- a stage device is provided with a movable body which holds a substrate, and in which liquid is supplied to a surface of the substrate, and a supporting plate which movably supports the movable body.
- a collection device is arranged which collects the discharged liquid.
- the liquid can be collected by the collection device, so it is possible to suppress problems such as a device/member failure, leakage, rust/oxidation, etc., or to reduce the effects of such problems.
- An exposure apparatus exposes a pattern of a mask onto a photosensitive substrate which is held to a substrate stage via a projection optical system.
- the stage device described above is used as a substrate stage, and a pattern image is projected onto the photosensitive substrate via liquid which is filled between an end portion of the projection optical system and the photosensitive substrate.
- An exposure method of one embodiment of this invention in which a pattern of a mask is exposed to a substrate on a substrate stage, which is movably supported on a supporting plate, by a projection optical system includes a step of filling between an end portion of a projection optical system and the substrate with liquid, and a step of collecting the discharged liquid when the liquid is discharged to the supporting plate.
- this liquid can be collected by the collection device.
- problems such as a device/member failure, leakage, rust/oxidation, etc., or to at least reduce the effects of such problems.
- FIG. 1 is a schematic structure diagram showing a supporting plate and a stage device of a first embodiment of this invention
- FIG. 2 is a perspective view showing a stage device
- FIG. 3 is an outer perspective view showing an X guide stage and a substrate supporting plate within the stage device;
- FIG. 4 is a perspective view showing a schematic structure of a supporting plate and a stage device according to a second embodiment of this invention
- FIG. 5 is a perspective view showing a schematic structure of a supporting plate and a stage device according to a third embodiment of this invention.
- FIG. 6 is a schematic structure diagram showing an exposure device utilizing an embodiment of this invention.
- FIG. 7 is a schematic structural diagram showing the vicinity of an end portion of a projection optical system, a liquid supply mechanism, and a liquid collection mechanism;
- FIG. 8 is a plan view showing a positional relationship among a projection area of the projection optical system, the liquid supply mechanism, and the liquid collection mechanism;
- FIG. 9 is a diagram showing another embodiment of a collection portion arranged on the substrate supporting plate.
- FIG. 10 is a diagram showing another embodiment of the collection portion arranged on the substrate supporting plate.
- FIG. 11 is a perspective view showing another embodiment of the X guide stage.
- FIG. 12 is a flowchart showing an example of a manufacturing process of a semiconductor device.
- FIG. 1 is a schematic structural diagram showing an embodiment of a stage device utilizing some aspects of this invention.
- a stage device ST shown in FIG. 1 is mainly constituted by a substrate supporting plate (supporting plate) 41 which is supported by three or four points on a base plate 4 via a vibration isolation unit (removal device) 9 , a substrate stage PST as an object (movable body) which supports the substrate P and moves a top surface (support surface) 41 A of the substrate supporting plate 41 , an X linear motor 47 which drives the substrate stage PST in an X axis direction (horizontal direction in FIG. 1 ), and a Y linear motor 48 which drives the substrate stage PST in a Y axis direction (direction perpendicular to a paper plane of FIG. 1 ).
- the vibration isolation unit 9 is provided with an actuator such as an air mount, a voice coil motor, or the like in which an internal pressure can be controlled, and is constituted such that the substrate supporting plate 41 is driven in a direction perpendicular to the top surface 41 A by driving the actuator.
- an actuator such as an air mount, a voice coil motor, or the like in which an internal pressure can be controlled
- the substrate stage PST is constituted by a table portion PH which adsorbs (by suction) and holds the substrate P, and a stage portion PS which is movably arranged along with table portion PH.
- air bearings 42 which are formed of a plurality of non-contact bearings, are arranged under the stage portion PS.
- the air bearings 42 are provided with exit ports 42 B which discharge air to the top surface (guide surface) 41 A of the substrate supporting plate 41 , and intake ports 42 A which adsorb air between the lower surface (bearing surface) of the substrate stage PST and the guide surface 41 A.
- the substrate stage PST Due to the balance between the pressing force of the outflow of air from the exit ports 42 B and an adsorption force by the intake ports 42 A, a predetermined space is maintained between the lower surface of the substrate stage PST (stage portion PS) and the guide surface 41 A. That is, the substrate stage PST is supported in a non-contact manner by the air bearings 42 with respect to the top surface (guide surface) 41 A of the substrate supporting plate 41 , and is two-dimensionally movable within a plane parallel to the top surface 41 A, i.e., within an XY plane, and is micro-rotatable in a ⁇ Z direction of rotation about an axis parallel to a Z axis, which is perpendicular to the top surface 41 A.
- the table portion PH is movably arranged in the Z axis direction, ⁇ X direction (direction of rotation about an axis parallel to the X axis), and ⁇ Y direction (direction of rotation about an axis parallel to the Y axis).
- the substrate stage drive mechanism is controlled by a control device CONT. That is, the table portion PH controls a Z position and an inclination angle of the substrate P, matches the surface of the substrate P with a predetermined plane position, and positions the substrate P in the X axis direction and Y axis direction.
- spray ports (second removal devices) 75 which spray air are arranged in the vicinity of the bottom portion of the stage portion PS.
- the spray ports 75 spray air, which removes any liquid remaining on the top surface 41 A of the substrate supporting plate 41 , in a diagonally downward direction toward the top surface 41 A.
- a plurality of spray ports are formed in the four corners of the periphery of the stage portion PS (see FIG. 2 ; however, in FIG. 2 , spray ports that are formed on the +X side and +Y side of the stage portion PS are not depicted), and are connected to an undepicted air supply source.
- Moving mirrors 45 are arranged on the substrate stage PST (i.e., on a surface 62 of the table portion PH). Furthermore, laser interferometers 46 are arranged at positions opposite to the moving mirrors 45 . The position of the substrate P on the substrate stage PST in the two-dimensional directions X and Y, and the rotation angle are measured by the laser interferometers 46 in real time, and the measurement results are provided to the control device CONT.
- the control device CONT positions the substrate P, which is supported on the substrate stage PST, by driving a substrate stage drive mechanism including a linear motor based on the measurement result of the laser interferometers 46 .
- the moving mirrors 45 can be arranged on the side surfaces of the substrate stage PST, and the table portion PH can be made to be entirely flat.
- a supply nozzle 14 which supplies liquid 1 to the substrate P
- a collection nozzle 21 which collects the liquid 1 on the substrate P.
- FIG. 2 is a schematic perspective view showing the substrate stage PST and the substrate stage drive mechanism which drives the substrate stage PST.
- the substrate stage PST (stage portion PS) is movably supported by an X guide stage 44 in the X axis direction.
- the substrate stage PST can be moved by an X linear motor 47 in the X axis direction by a predetermined stroke, while being guided with the X guide stage 44 .
- the X linear motor 47 is provided with a stator 47 A which is arranged so as to extend on the X guide stage 44 in the X axis direction, and a movable portion 47 B which is fixed to the substrate stage PST and arranged in correspondence with the stator 47 A.
- the movable portion 47 B is driven with respect to the stator 47 A, so the substrate stage PST is moved in the X axis direction.
- the substrate stage PST is supported in a non-contact manner by a magnetic guide formed of a magnet and an actuator, which maintains a predetermined gap in the Z axis direction with respect to the X guide stage 44 .
- the substrate stage PST is moved by the X linear motor 47 in the X axis direction in a state in which the substrate stage PST is supported in a non-contact manner on the X guide stage 44 .
- an encoder encoder head
- FIG. 3 is a diagram showing only the X guide stage 44 and the substrate supporting plate 41 of the stage device ST shown in FIG. 2 .
- the X guide stage 44 which is a stage structural body and arranged above the substrate supporting plate 41 is formed in a cross-sectional substantially concave shape which is opened upwardly.
- inclined surfaces (second inclined portion) 44 A are formed which are inclined gradually downward to the substantially central portion in the width direction.
- a plurality of drain ports (through holes) 44 B are formed, spaced apart from each other in a longitudinal direction of the X guide stage 44 .
- the drain ports 44 B are formed so as to be positioned above the top surfaces 41 A of the substrate supporting plate 41 , i.e., at positions such that when liquid is discharged from the drain ports 44 B, the liquid drips onto the top surfaces 41 A.
- stator 47 A of the X linear motor 47 and the inclined surfaces 44 A are spaced apart from each other by using an undepicted spacer located within a concave portion of the X guide stage 44 , so as to not prevent liquid from moving along the inclined surfaces 44 A.
- the stage device ST includes a collection device 71 that collects liquid discharged to the substrate supporting plate 41 .
- the collection device 71 is constituted by a gutter (collection portion) 72 which is arranged along the outer circumference of the substrate supporting plate 41 , a waste liquid tube 73 which is connected to the gutter 72 , and a suction device 74 which suctions the liquid discharged to the gutter 72 via the waste liquid tube 73 .
- the gutter 72 is formed in a cross-sectional substantially U shape (concave shape), which is opened upwardly (see FIG. 1 ), and liquid repellent coating (liquid repellent processing) of a fluorine or fluorine compound is performed on the bottom surface 72 A and the side surface 72 B within the concave portion.
- the bottom surface 72 A of the gutter 72 is arranged at a position lower than the top surface 41 A of the supporting plate 41 .
- a corner portion C 1 (corner of the +X and ⁇ Y sides) connected to the waste liquid tube 73 is made to be the lowest portion, and a corner portion C 2 opposite to the corner portion C 1 is made to be the highest position. This forms inclined portions, which are inclined in both the X axis direction and the Y axis direction.
- liquid repellent coating formed of fluorine or fluorine compound is performed, and thus liquid repellency is provided.
- liquid repellent coating for the substrate supporting plate 41 can be performed for the entire substrate supporting plate 41 , not only for the top surface 41 A.
- a pair of Y linear motors 48 , 48 are arranged which can move the X guide stage 44 with the substrate stage PST in the Y axis direction.
- the respective Y linear motors 48 , 48 are provided with movable parts 48 B which are arranged on both ends, in the longitudinal direction, of the X guide stage 44 , and stators 48 A which are arranged in correspondence with the movable parts 48 B. Furthermore, as the movable parts 48 B are driven by the stators 48 A, the X guide stage 44 is moved in the Y axis direction along with the substrate stage PST.
- the X guide stage 44 can be rotatably moved in the ⁇ Z direction. Therefore, the substrate stage PST can be moved by the Y linear motors 48 , 48 in the Y axis direction and in the ⁇ Z direction substantially integrally with the X guide stage 44 .
- guide portions 49 are arranged which are formed in an L shape as seen from a front view and guide the movement of the X guide stage 44 in the Y axis direction.
- stators 48 A of the Y linear motors 48 are arranged on the flat portions 49 B of the guide portions 49 .
- U-shaped guide members 50 are respectively arranged on both end portions in the longitudinal direction under the X guide stage 44 .
- the guide portions 49 are engaged to the guide members 50 and arranged so that the top surfaces (guide surfaces) 49 A of the guide portions 49 face the internal surfaces of the guide members 50 .
- Air bearings 51 which are non-contact bearings are arranged on the guide surfaces 49 A of the guide portions 49 , and the X guide stage 44 is supported in a non-contact manner with respect to the guide surfaces 49 A.
- air bearings 52 which are non-contact bearings exist respectively between the stators 48 A of the Y linear motors 48 and the flat portions 49 B of the guide portions 49 , and the stators 48 A are supported in a non-contact manner with respect to the flat portions 49 B of the guide portions 49 by the air bearings 52 . Because of this, due to the conservation of momentum, according to the movement in the +Y direction (or ⁇ Y direction) of the X guide stage 44 and the substrate stage PST, the stators 48 A are moved in the ⁇ Y direction (or +Y direction). Due to the movement of the stators 48 A, a reaction force caused due to the movement of the X guide stage 44 and the substrate stage PST is canceled, and changes in a centroid position can be avoided. That is, the stators 48 A function as a so-called countermass.
- the substrate stage PST by controlling a supply amount of the liquid 1 from the supply nozzle 14 and a collection amount of the liquid 1 by the collection nozzle 21 , in a condition in which a predetermined amount of liquid 1 is maintained on the surface of the substrate P, the substrate stage PST can be moved by the substrate stage drive mechanism along the supporting plate 41 .
- the liquid discharged to the X guide stage 44 flows along the inclined surfaces 44 A without remaining within the concave portion, and drips onto the top surface 41 A of the substrate supporting plate 41 via the drain ports 44 B at the lower end portion of the inclined surfaces 44 A (see FIG. 3 ).
- the substrate stage PST when the substrate stage PST is operated, air is sprayed out from the spray ports 75 , arranged in the bottom portion of the substrate stage PST (stage portion PS), to the top surface 41 A.
- the top surface 41 A of the supporting plate 41 is provided with liquid repellency.
- the liquid discharged to the top surface 41 A is moved as liquid drops and is collected by the gutter 72 .
- liquid repellent processing is performed, and the bottom surface 72 A is inclined, so liquid is discharged (rolls) below the top surface 41 A (i.e., below the surface of the substrate P) along the bottom surface 72 A in a liquid drop state, and is discharged and collected from the waste liquid tube 73 through suction by the suction device 74 .
- the top surface 41 A of the substrate supporting plate 41 is inclined with respect to a horizontal plane. By doing this, liquid drops roll over the top surface 41 A and fall into the gutter 72 . At this time, regardless of the direction of inclination of the substrate supporting plate 41 , the bottom surface 72 A of the gutter 72 is inclined.
- the liquid can be collected via the waste liquid tube 73 , but by making the supporting plate 41 inclined at a position in which the corner portion C 1 connected to the waste liquid tube 73 is the lowest, the liquid drops are discharged to the gutter 72 in the vicinity of the corner portion C 1 , so the time until the liquid on the supporting plate 41 is discharged via the waste liquid tube 73 can be shortened, which is preferable.
- the bottom portion 72 A of the gutter 72 of the collection device 71 has liquid repellency, and an inclined surface is provided which discharges the liquid below the supporting plate top surface 41 A, so discharging and collection can be smoothly performed without clogging the liquid in the gutter 72 .
- liquid repellency is provided on the top surface 41 A of the substrate supporting plate 41 , so the liquid cannot be easily attached to the surface, but rather can be easily dripped into the gutter 72 .
- air is sprayed from the spray ports 75 to the supporting plate top surface 41 A, so the liquid which remains on the surface can be easily removed, and even when the liquid is splashed onto the supporting plate top surface 41 A during the drive of the substrate stage PST, the possibility of liquid being caught between the air bearings 42 and the top surface 41 A can be reduced, and this can contribute to the stable drive of the substrate stage PST.
- the liquid can be easily removed by inclining the substrate supporting plate 41 by the vibration isolation units 9 .
- the liquid which has been discharged can be collected by the substrate supporting plate 41 , so a structure is provided in which the liquid supplied onto the surface of the substrate P does not collect on the substrate stage PST.
- vibration due to the liquid collection can be controlled, and by covering a large part of the substrate surface by liquid, the temperature deterioration of the substrate due to air heat can be controlled.
- the splashed/discharged liquid can be guided downwardly by the inclined surfaces 44 A and discharged from the drain ports 44 B, so a heat effect due to the liquid remaining on the X guide stage 44 can be suppressed, and it is possible to suppress liquid from generating water stains and bacteria, as water tends to do.
- the X guide stage 44 in the same manner as the supporting plate top surface 41 A and the bottom surface 72 A of the gutter 72 , it is preferable that liquid movement can be easily facilitated by applying liquid repellency.
- an encoder head or the like arranged on the substrate stage PST should be covered by a cover or the like so as to not contact the liquid.
- FIG. 4 is a diagram schematically showing the substrate stage PST, the substrate supporting plate 41 , and the X guide stage 44 within the stage device. Furthermore, in FIG. 4 , the moving mirror and the substrate on the substrate stage PST, and the gutter of the substrate supporting plate 41 are omitted from the drawing, although they would be present in the actual device.
- a groove portion 76 is formed along an edge (outer circumference). Furthermore, on one side surface of the table portion PH, a slot portion 77 is formed which is positioned above a concave portion 44 C of the X guide stage 44 , and extends in the Z axis direction, and is connected to the groove portion 76 .
- a drain port 44 B is formed at a position displaced in an outward direction from the substrate supporting plate 41 in the X direction.
- a waste liquid tube 78 is connected to the waste drain port 44 B.
- a suction device 79 which suctions liquid via the waste liquid tube 78 is connected to the waste liquid tube 78 .
- the bottom portion 44 D within the concave portion 44 C is formed so as to be inclined so that the drain port 44 B is located at the lowest part.
- the liquid applied onto the table portion PH is discharged to the groove portion 76 and then to the concave portion 44 C of the X guide stage 44 via the slot portion 77 . Furthermore, the liquid discharged to the concave portion 44 C is discharged to the drain port 44 B along the incline of the bottom portion 44 D, and is discharged and collected from the waste liquid tube 78 due to the suction of the suction device 79 .
- the liquid splashed and discharged to the concave portion 44 C of the X guide stage 44 does not reach the top surface 41 A of the substrate supporting plate 41 , so it is possible to reduce the liquid amount which remains on the top surface 41 A. Additionally, a possibility of liquid being caught between the air bearings and the top surface 41 A can be further reduced. Therefore, the drive stability of the substrate stage PST can be further improved.
- the third embodiment of a supporting plate and stage device utilizing aspects of this invention is explained.
- the only difference between the third and second embodiments is the structure which discharges liquid from the drain port 44 B. That is, in this embodiment, the drain port 44 B of the X guide stage 44 is formed above the gutter 72 . Furthermore, a waste liquid tube or the like is not connected to the drain port 44 B.
- the liquid discharged to the concave portion 44 C of the X guide stage 44 flows along the incline of the bottom portion 44 D, and is collected by the gutter 72 as it naturally drips from the drain port 44 B.
- the liquid splashed and discharged to the X guide stage 44 is not forcibly adsorbed, so generation of vibration due to suction can be suppressed.
- an exposure apparatus provided with the stage device ST shown in the above-mentioned first embodiment is explained with reference to FIGS. 6-8 .
- an example is used in which a stage device of the above-mentioned embodiment is applied to a substrate stage which holds and moves a photosensitive substrate.
- the same symbols as in the above-mentioned first embodiment are used for the same structural elements, and their explanation is omitted or simplified.
- FIG. 6 is a schematic structural diagram showing an exposure apparatus utilizing aspects of this invention.
- an exposure apparatus EX is equipped with a mask stage MST that supports a mask M, a stage device ST shown in FIGS. 1-3 having a substrate stage PST that supports a substrate (photosensitive substrate) P, an illumination optical system IL that illuminates with exposure light EL the mask M supported by the mask stage MST, a projection optical system PL that projects and exposes a pattern image of the mask illuminated by the exposure light EL onto the substrate P supported by the substrate stage PST, and a control device CONT that generally controls the operation of the entire exposure apparatus EX.
- a warning device K that generates warnings when abnormalities occur in the exposure process is connected.
- the exposure apparatus EX is equipped with a main column 3 that supports the mask stage MST and the projection optical system PL.
- the main column 3 is placed on a base plate 4 mounted horizontally to the floor.
- An upper side step portion 3 A and a lower side step portion 3 B that project inwardly are formed on the main column 3 .
- the exposure apparatus EX of this embodiment is an immersion exposure apparatus, in which an immersion method is used to substantially widen the depth of focus as well as increase the resolution by substantially shortening the exposure wavelength, and which is equipped with a fluid supply mechanism 10 that supplies fluid 1 onto the substrate P and a fluid collecting mechanism 20 that collects the fluid 1 from the substrate P.
- the exposure apparatus EX forms an immersion region AR 2 at a part of the substrate P including a projection region AR 1 of the projection optical system PL by the fluid 1 supplied from the fluid supply mechanism 10 .
- the exposure apparatus EX fills the fluid 1 between an optical element 2 located at a front end portion (lower end portion) of the projection optical system PL and a surface of the substrate P, and exposes the substrate P by projecting a pattern image of the mask M onto the substrate P through the fluid between the projection optical system PL and the substrate P.
- the explanation is made with an example using a scanning-type exposure apparatus (a so-called scanning stepper), as the exposure apparatus EX, that exposes a pattern formed on the mask M onto the substrate P while synchronously moving the mask M and substrate P in mutually different directions (opposite directions) in the scanning direction.
- a scanning-type exposure apparatus a so-called scanning stepper
- the exposure apparatus EX that exposes a pattern formed on the mask M onto the substrate P while synchronously moving the mask M and substrate P in mutually different directions (opposite directions) in the scanning direction.
- the direction that matches an optical axis AX of the projection optical system PL is designated as a Z-axis direction
- a direction (scan direction) of the synchronous movement by the mask M and the substrate P in a plane perpendicular to the Z-axis direction is designated as an X-axis direction
- the direction (non-scan direction) perpendicular to the Z-axis direction and the X-axis direction is designated as a Y-axis direction.
- substrate includes a substrate on which a photoresist, which is a photosensitive material, is applied on a semiconductor wafer
- mask includes a reticle on which a device pattern to be reduced and projected on the substrate is formed.
- the illumination optical system IL is supported by a support column 5 fixed on the upper part of the main column 3 .
- the illumination optical system IL illuminates the mask M supported by the mask stage MST with the exposure light EL, and has an exposure light source, an optical integrator that uniformizes the intensity of the luminous flux ejected from the exposure light source, a condenser lens that collects the exposure light EL from the optical integrator, a relay lens system, and a variable field stop that sets an illumination region on the mask M by the exposure light EL in a slit shape.
- the predetermined illumination region on the mask M is illuminated with the exposure light EL having a uniform intensity distribution by the illumination optical system IL.
- the exposure light EL ejected from the illumination optical system IL may be a bright line in the ultraviolet region (g-line, h-line, or i-line) ejected from a mercury lamp, ultraviolet light (DUV light), such as KrF excimer laser light (wavelength: 248 nm), and vacuum ultraviolet light (VUV light), such as ArF excimer laser light (wavelength: 193 nm) and F 2 laser light (wavelength: 157 nm).
- DUV light ultraviolet light
- ArF excimer laser light wavelength: 193 nm
- F 2 laser light wavelength: 157 nm
- pure water is used as the fluid 1 .
- the pure water is transmissive to the bright line in the ultraviolet region (g-line, h-line, or i-line) ejected from the mercury lamp, for example, and the far ultraviolet light (DUV light), such as the KrF excimer layer light (wavelength: 248 nm).
- the ultraviolet region g-line, h-line, or i-line
- DUV light far ultraviolet light
- the mask stage MST supports the mask M and is equipped with an opening 34 A for passing the pattern image of the mask M in the center part thereof.
- a mask support plate 31 is supported via a vibration isolation unit 6 .
- An opening 34 B for passing the pattern image of the mask M is also formed in the center part of the mask support plate 31 .
- a plurality of air bearings 32 which are non-contact bearings, are provided on the lower surface of the mask stage MST.
- the mask stage MST is supported on the upper surface (guide surface) 31 A of the mask support plate 31 by the air bearing 32 without contact, and is movable two-dimensionally in the plane perpendicular to the optical axis AX of the projection optical system PL, that is, the XY plane, and minutely rotatable in the OZ direction, by the mask stage drive mechanism, such as a linear motor.
- a movable mirror 35 is provided on the mask stage MST.
- a laser interferometer 36 is provided at a position facing the movable mirror 35 .
- the position in a two-dimensional direction and a rotational angle in the ⁇ Z direction (including rotational angles in the ⁇ X and ⁇ Y directions depending on the case) of the mask M on the mask stage MST are calculated in real time by the laser interferometer 36 , and the result of such measurements is output to the control device CONT.
- the control device CONT controls the position of the mask M supported by the mask stage MST by driving the mask stage drive mechanism based on the result of measurement by the laser interferometer 36 .
- the projection optical system PL projects and exposes the pattern of the mask M onto the substrate P at a predetermined projection magnification ⁇ , and consists of a plurality of optical elements including an optical element (lens) 2 provided at the front end portion on the substrate P side. These optical elements are supported by a lens barrel PK.
- the projection optical system PL is a reduction system, in which the projection magnification ⁇ is 1 ⁇ 4 or 1 ⁇ 5, for example.
- the projection optical system PL may be an equal magnification system or an enlargement system.
- An outer circumferential portion of the lens barrel PK is provided with a flange portion FLG.
- a lens barrel support plate 8 is supported via a vibration isolation unit 7 .
- the projection optical system PL is supported to the lens barrel support plate 8 .
- the optical element 2 at the front end portion of the projection optical system PL of this embodiment is provided attachably and detachably (replaceably) to the lens barrel PK.
- the fluid 1 in the immersion region AR 2 contacts the optical element 2 .
- the optical element 2 is formed by fluorite. Because the fluorite has high attractiveness with water, the fluid 1 can be adhered substantially to the entire surface of the fluid contact surface 2 a of the optical element 2 . In other words, because the fluid (water) 1 having high adherence with the fluid contact surface 2 a of the optical element 2 is supplied in this embodiment, the adherence between the fluid contact surface 2 a of the optical element 2 and the fluid 1 is high. Therefore, an optical path between the optical element 2 and the substrate P can be accurately filled with the fluid 1 .
- the optical element 2 may be quartz having high attractiveness with water. Moreover, by performing a hydrophilization (lyophilization) process to surface 2 a , the attractiveness with the fluid 1 can be increased.
- a plate member 2 P is provided so as to surround the optical element 2 .
- a surface (i.e., lower surface) that faces the substrate P of the plate member 2 P is a flat surface.
- the lower surface (fluid contact surface) 2 a of the optical element 2 also is a flat surface, and the lower surface of the plate member 2 P and the lower surface of the optical element 2 are substantially flat.
- the immersion region AR 2 can be well formed in a wide range.
- the lower surface of the plate member 2 P can be processed with a surface treatment (hydrophilic treatment) similarly to the optical element 2 .
- FIG. 7 is an enlarged diagram showing the vicinity of the fluid supply mechanism 10 , fluid collecting mechanism 20 , and the front portion of the projection optical system PL.
- the fluid supply mechanism 10 supplies the fluid 1 between the projection optical system PL and the substrate P, and is equipped with a fluid supply portion 11 that can eject the fluid 1 , and a supply nozzle 14 that is connected to the fluid supply portion 11 via a supply tube 15 and supplies the fluid ejected from the fluid supply portion 11 onto the substrate P.
- the supply nozzle 14 is positioned near the surface of the substrate P.
- the fluid supply portion 11 is equipped with a tank for accommodating the fluid 1 , a pressure pump, and the like.
- the fluid 1 is supplied onto the substrate P through the supply tube 15 and the supply nozzle 14 .
- the fluid supply operation of the fluid supply portion 11 is controlled by the control device CONT, and the control device CONT can control the amount of fluid supplied per unit time to the substrate P by the fluid supply portion 11 .
- a flow meter 12 for measuring the amount of the fluid 1 supplied to the substrate P by the fluid supply portion 11 (amount of fluid supplied per unit time) is provided in the middle of the supply tube 15 .
- the flow meter 12 constantly monitors the amount of fluid 1 to be supplied on the substrate P and outputs the result of the measurement to the control device CONT.
- a valve 13 for opening and closing a flow path of the supply tube 15 is provided in the supply tube 15 between the flow meter 12 and the supply nozzle 14 . The open/close operation of the valve 13 is controlled by the control device CONT.
- valve 13 is of a so-called normal-off type that mechanically closes the flow path of the supply tube 15 when a drive source (power source) of the exposure apparatus EX (control device CONT) is stopped due to, for example, power outage or the like.
- the fluid collecting mechanism 20 collects the fluid on the substrate P supplied by the fluid supply mechanism 10 and includes a collecting nozzle (absorption opening) 21 positioned near the surface of the substrate P, and a vacuum system 25 connected to the collecting nozzle 21 via a collecting tube 24 .
- the vacuum system 25 is structured by including a vacuum source, and its operation is controlled by the control device CONT. By driving the vacuum system 25 , the fluid 1 on the substrate P is collected through the collecting nozzle 21 along with the ambient gas (air).
- a vacuum system for a factory in which the exposure apparatus EX is located, may be used without providing a separate vacuum pump on the exposure apparatus.
- a gas/fluid separator 22 that separates the fluid 1 and the gas absorbed by the collecting nozzle 21 is provided in the middle of the collecting tube 24 .
- the gas/fluid separator 22 separates the fluid 1 and the gas collected by the collecting nozzle 21 .
- a gravity separation method that separates the fluid and the gas by dropping the fluid using gravity through a hole portion, or a centrifugal separation method that separates the collected fluid and gas using centrifugal force may be used.
- the vacuum system 25 absorbs the gas separated by the gas/fluid separator 22 .
- a dryer 23 that dries the gas separated by the gas/fluid separator 22 is provided in the collecting tube 24 between the vacuum system 25 and the gas/fluid separator 22 . If a fluid composition is mixed in the gas separated by the gas/fluid separator 22 , by drying the gas using the dryer 23 and by flowing the dried gas into the vacuum system 25 , occurrence of troubles, such as malfunction of the vacuum system 25 , originated from the fluid composition that is flowed thereinto, can be prevented.
- a method for removing the fluid composition by cooling the gas supplied by the gas/fluid separator 22 (gas in which the fluid composition is mixed) below the dew point of the fluid or a method for removing the fluid composition by heating the gas above the boiling point of the fluid may be used.
- the fluid 1 that has been separated by the gas/fluid separator 22 is collected in a fluid collecting portion 28 through a second collecting tube 26 .
- the liquid collecting portion 28 is equipped with a tank that accommodates the collected fluid 1 and the like.
- the fluid 1 collected by the fluid collecting portion 28 may be, for example, disposed or recycled by returning it to the fluid supply portion 11 or the like after cleaning.
- a flow meter 27 that measures the amount of collected fluid 1 (the amount of fluid collected per a unit time) is provided in the middle of the second collecting tube between the gas/liquid separator 22 and the fluid collecting portion 28 .
- the flow meter 27 constantly monitors the amount of the fluid collected from the substrate P and outputs the result of the measurement to the control device CONT.
- the liquid 1 on the substrate P and the ambient gas are collected from the collecting nozzle 21 .
- the flow meter 27 can accurately measure the amount of fluid uncollected from the substrate P.
- the exposure apparatus EX is equipped with a focus detection system 56 that detects a position of a surface of the substrate P supported by the substrate stage PST.
- the focus detection system 56 is equipped with a light projection portion 56 A that projects a detection luminous flux onto the substrate P from a diagonal direction through the fluid 1 , and a light receiving portion 56 B that receives reflection light of the detection luminous flux reflected on the substrate P.
- the result of receiving light by the focus detection system 56 (light receiving portion 56 B) is output to the control device CONT.
- the control device CONT can detect the positional information of the surface of the substrate P in the Z-axis direction.
- the control device CONT can detect the positional information of the surface of the substrate P in the Z-axis direction.
- the control device CONT can detect the positional information of the surface of the substrate P in the Z-axis direction.
- the inclination information of the substrate P in the ⁇ X and ⁇ Y directions also can be obtained.
- the fluid supply mechanism 10 and the fluid collecting mechanism 20 are separately supported with respect to the lens barrel support plate 8 .
- vibration generated at the fluid supply mechanism 10 and the fluid collecting mechanism 20 is hardly transferred to the projection optical system PL through the lens barrel support plate 8 .
- FIG. 8 is a plane diagram showing the positional relationship of the fluid supply mechanism 10 , the fluid collecting mechanism 20 , and the projection region AR 1 of the projection optical system PL.
- the projection region AR 1 of the projection optical system PL is in a rectangular shape (slit shape) that is long and thin and extends in the Y-axis direction.
- Three supply nozzles 14 A- 14 C are positioned on the +X side, and two collecting nozzles 21 A and 21 B are positioned on the ⁇ X side, so as to sandwich the projection region AR 1 in the X-axis direction, and the collecting nozzles 21 A and 21 B are connected to the vacuum system 25 via the collecting tube 24 .
- the supply nozzles 14 A′- 14 C′ and collecting nozzles 21 A′ and 21 B′ are positioned at the position at which the supply nozzles 14 A- 14 C and the collecting nozzles 21 A and 21 B are rotated substantially by 180°.
- the supply nozzles 14 A- 14 C and the collecting nozzles 21 A′ and 21 B′ are arranged alternately in the Y-axis direction, and the supply nozzles 14 A′- 14 C′ and the collecting nozzles 21 A and 21 B are alternately arranged in the Y-axis direction.
- the supply nozzles 14 A′- 14 C′ are connected to the fluid supply portion 11 via the supply tube 15 ′, and the collecting nozzles 21 A′ and 21 B′ are connected to the vacuum system 25 via a collecting tube 24 ′.
- a flow meter 12 ′ and a valve 13 ′ are provided in the middle of the supply tube 15 ′.
- a gas/fluid separator 22 ′ and a dryer 23 ′ are provided in the middle of the collecting tube 24 ′.
- the control device CONT After loading the mask M on the mask stage MST and loading the substrate P onto the substrate stage PST, the control device CONT drives the fluid supply portion 11 of the fluid supply mechanism 10 and supplies the predetermined amount of the fluid 1 per unit time onto the substrate P through the supply tube 15 and the supply nozzle 14 .
- the control device CONT drives the vacuum system 25 of the fluid collecting mechanism 20 in accordance with the supply of the fluid 1 by the fluid supply mechanism 10 , and collects the predetermined amount of the fluid 1 per unit time through the collecting nozzle 21 and the collecting tube 24 .
- an immersion region AR 2 for the fluid 1 is formed between the optical element 2 at the front end portion of the projection optical system PL and the substrate P (step of filling fluid).
- the control device CONT controls each of the fluid supply mechanism 10 and the fluid collecting mechanism 20 so as to make the amount of the fluid supplied to the substrate P and the amount of fluid collected from the substrate P become substantially the same amount.
- the control device CONT illuminates the mask M by the exposure light EL using the illumination optical system IL, and projects the image of the pattern on the mask M onto the substrate P through the projection optical system PL and the fluid 1 .
- a portion of a pattern image on the mask M is projected onto the projection region AR 1 .
- the substrate P moves in the +X direction (or ⁇ X direction) at speed ⁇ V (where ⁇ is a projection magnification) via the substrate stage PST.
- the next shot region is moved to a scan start position by the stepping of the substrate P, and the exposure process for each shot region is sequentially performed using a step-and-scan method.
- the fluid 1 is set to flow in the direction parallel to the direction of movement of the substrate P, that is, in the same direction as the direction of the movement of the substrate P.
- the fluid 1 flows in the +X direction so as to fill between the optical element 2 at the front end portion of the projection optical system PL and the substrate P.
- the fluid 1 supplied via the supply nozzle 14 flows as if it is pulled between the optical element 2 and the substrate P in accordance with the movement of the substrate P in the ⁇ X direction or +X direction. Therefore, the fluid 1 can be supplied easily between the optical element 2 and the substrate P even if the supply energy of the fluid supply mechanism 10 (fluid supply portion 11 ) is small. Therefore, by switching the direction of the flow of the fluid 1 depending on the scan direction, the space between the optical element 2 and the substrate P can be filled with the fluid 1 even when the substrate P is scanned in either direction of the +X direction and the ⁇ X direction. Therefore, high resolution and wide depth of focus can be obtained.
- the control device CONT compares the result of measurement by the flow meter 12 , that is, the amount of fluid supplied on the substrate P by the liquid supply mechanism 10 , and the result of measurement by the flow meter 27 , that is, the amount of fluid collected from the substrate P by the liquid collecting mechanism 20 , and controls the valve 13 of the fluid supply mechanism 10 based on the result of the comparison.
- the control device CONT determines a difference between the amount of fluid supplied on the substrate P (the result of measurement by the flow meter 12 ) and the amount of fluid collected from the substrate P (the result of measurement by the flow meter 27 ), and controls the valve 13 based on whether the determined difference exceeds a predetermined tolerance (threshold value).
- a predetermined tolerance threshold value
- the control device CONT determines, as a result of the malfunction of the collecting operation by the fluid collecting mechanism 20 , that a sufficient amount of the fluid is not collected. At this time, the control device CONT determines that abnormalities, such as malfunctions, occurred at the vacuum system 25 of the fluid collecting mechanism 20 , for example. In addition, to prevent a leaking of the fluid 1 due to the fact that the fluid 1 cannot be normally collected by the fluid collecting mechanism 20 , the control device CONT closes the flow path of the supply tube 15 by operating the valve 13 of the fluid supply mechanism 10 , and stops the supply of the fluid 1 to the substrate P by the fluid supply mechanism 10 .
- the control device CONT compares the amount of fluid supplied to the substrate P from the fluid supply mechanism 10 and the amount of the fluid collected by the fluid collecting mechanism 20 , detects the abnormality of the collecting operation of the fluid collecting mechanism 20 based on the result of the comparison, and stops the supply of the fluid 1 to the substrate P when the fluid 1 is oversupplied or abnormalities are detected.
- the control device CONT may generate a warning via the above-described warning device K when the abnormality is detected.
- the control device CONT may display the abnormality to a display device by providing the display device to the above-described warning device K.
- a water leakage sensor at least a part (e.g., gutter member 72 or groove portion) of the collecting device 71 , the abnormality can be detected based on the result of the detection by the water leakage sensor.
- the fluid 1 that has been supplied onto the substrate P is not collected by the fluid collecting mechanism 20 , as described in the above first embodiment, but instead outflows directly from the substrate stage PST or indirectly onto the upper surface 41 A of the substrate support plate 41 via the X guide stage 44 .
- a part of the outflown fluid is collected by flowing into the gutter member 72 .
- the fluid remaining on the support plate upper surface 41 A can be collected by flowing the fluid into the gutter member 72 by the control device CONT driving (an actuator of) the vibration actuation unit 9 to tilt the substrate support plate 41 .
- a gutter member 72 is provided in the vicinity of the substrate support plate 41 as a collecting portion of the collecting device 71 .
- the invention is not limited to this.
- a groove portion 81 by forming a groove portion 81 by a step portion 41 B, which is formed lower than the substrate top surface 41 A, along the entire circumference of the edge of the substrate support plate 41 , and a wall member 80 provided on the side surface of the substrate support plate 41 , the fluid scattered and outflown to the substrate support plate 41 is collected by the groove portion 81 .
- the fluid repellent treatment is performed in the groove portion 81 to smoothly collect the fluid, and that the step portion 41 B is inclined.
- the groove portion 81 may be provided on the entire circumference of the outer circumference of the substrate support plate 41 , and this groove portion 81 may function as a collecting portion.
- the groove portion 81 need not necessarily be provided on the entire circumference of the substrate support plate 41 .
- two groove portions 81 may be provided on the outer circumference of the substrate support plate 41 in the X direction (scan direction), and two gutter members 72 may be provided along the outer circumference of the substrate support plate 41 in the Y direction (non-scan direction). Accordingly, portions of the collecting devices 71 disclosed in the embodiment may be combined.
- the inclined surface 44 A may be provided only on the upper portion side. However, to prevent the unbalanced load, it is preferred that it be provided symmetrically on the lower surface side as well.
- the fluid remaining on the substrate upper surface 41 A is removed by tilting the stage support plate 41 using the vibration isolation unit 9 .
- a structure in which the substrate upper surface 41 A is made an inclined surface that inclines with respect to the horizontal plane may also be used.
- the position of the surface of the substrate P should be corrected by driving the position of the table portion PH in the Z-axis direction depending on the position of the substrate stage PST.
- the surface of the table portion PH may be made an inclined surface or processed with the fluid repellent treatment.
- the substrate support plate 41 when tilting the substrate support plate 41 , and when the surface of the table portion PH is made an inclined surface, it is preferred to incline the substrate support plate 41 such that the side on which members that are not supposed to contact the fluid, such as movable mirrors and fiducial marks, are not provided on the lower side.
- the fluid 1 according to the embodiments is composed of pure water. Advantages of using such a fluid are that it can be obtained in large amounts at semiconductor manufacturing facilities and that there are no negative effects to the photoresist or the optical elements (lens) on the substrate P. In addition, because pure water has no negative effects to the environment, and because the amount of impurities is extremely low, it is expected to clean the surface of the substrate P and the surface of the optical elements provided on the front end surface of the projection optical system PL.
- the refractive index of pure water (water) with respect to the exposure light EL having the wavelength of approximately 193 nm is about 1.44, when the ArF excimer laser light (wavelength: 193 nm) is used as the light source for the exposure light EL. Therefore, high resolution is obtained by shortening the wavelength by 1/n, that is, approximately 139 nm on the substrate P.
- the depth of focus is increased by approximately n times compared to that in the air, that is, approximate 1.44 times, when it is only sufficient to secure the depth of focus that is approximately the same as when using in the air, the numeral aperture for the projection optical system PL can be increased, and thereby the resolution increases as well.
- fluids other than water may be used.
- the light source for the exposure light EL is a F 2 laser
- the F 2 laser light is not transmitted in water.
- a fluid of a fluorine system such as fluorine oil and perfluorinated polyether (PFPE)
- PFPE perfluorinated polyether
- the optical element 2 is mounted on the front end of the projection optical system PL.
- the optical element mounted on the front end of the projection optical system PL can be an optical plate used for adjusting the optical characteristics of the projection optical system PL, such as aberrations (spherical aberration, coma etc.). Instead, it may be a parallel plate that can transmit the exposure light EL.
- the shape of the above-described nozzles is not particularly limited.
- the supply and collection of the fluid 1 may be performed by two pairs of nozzles provided at the long sides of the projection region AR 1 .
- arrangements may be made by positioning the supply nozzles and the collection nozzles above and below.
- the substrate P in each of the above-described embodiments not only a semiconductor wafer for manufacturing semiconductor devices, but also glass substrates for manufacturing display devices, ceramic wafer for manufacturing thin-film magnetic heads, original plates for manufacturing masks and reticles (synthetic quartz and silicon wafer) used in an exposure device, may be used.
- an exposure apparatus in which the optical path between the projection optical system PL and the substrate P is locally filled with a fluid.
- this invention can be used in an immersion exposure apparatus in which a stage that holds a substrate to be exposed is moved in a fluid tank, as disclosed in Japanese Laid-Open Patent Application No. H06-124873, or an immersion exposure apparatus in which a fluid tank having a predetermined depth is formed on a stage and the substrate is held therein, as disclosed in Japanese Laid-Open Patent Application No. H10-303114.
- the exposure apparatus EX in addition to the scan-type exposure apparatus (scanning stepper) using a step-and-scan method that scan-exposes the pattern on the mask M by synchronously moving the mask M and the substrate P, a projection exposure apparatus (stepper) using a step-and-repeat method in which the pattern on the mask M is entirely exposed in a state where the mask M and the substrate P are stationary, and the substrate P is sequentially stepped, may be used.
- this invention may be used in an exposure apparatus using a step-and-stitch method in which at least two patterns are partially superimposingly transferred onto the substrate P.
- this invention may be used in a twin-stage type exposure apparatus, which is equipped two wafer stages (substrate stages) and in which the two wafer stages are switched between an alignment position and an exposure position, as disclosed in Japanese Laid-Open Patent Application No. 2001-160530.
- the fluid supply portion 11 and the fluid collecting portion 28 may be maintained driven when the two wafer stages are switched. This is because, as described above, the fluid 1 from the fluid supply portion 11 can be collected via the substrate support plate 41 . As a result, the throughput for the twin stage type exposure device can be further increased.
- the invention is not limited to the exposure apparatus for manufacturing semiconductor elements that exposes semiconductor element patterns on the substrate P. It may be used for an exposure apparatus for manufacturing liquid crystal display elements or for manufacturing displays, as well as an exposure apparatus for manufacturing thin-film magnetic heads, image shooting elements (CCD), reticles or masks.
- an exposure apparatus for manufacturing liquid crystal display elements or for manufacturing displays as well as an exposure apparatus for manufacturing thin-film magnetic heads, image shooting elements (CCD), reticles or masks.
- each of the stages PST and MST may be of a type that moves along a guide, or each may be of a guideless type that provides no guides.
- a flat motor may be used that drives each of the stages PST and MST using magnetic force by facing a magnetic unit in which magnets are two-dimensionally positioned, and an armature unit in which coils are two-dimensionally positioned.
- either one of the magnetic unit and the armature unit should be connected to the stages PST and MST, and the other one of the magnetic unit and the armature unit should be provided on the moving surface side of the stages PST and MST.
- the reaction force generated by the movement of the substrate stage PST may be transmitted mechanically to the floor (ground) using a frame member, as described in Japanese Laid-Open Patent Application No. H08-166475 (U.S. Pat. No. 5,528,118), so as not to transfer it to the projection optical system PL.
- the reaction force generated by the movement of the mask stage MST may be transmitted mechanically to the floor (ground) using a frame member, as described in Japanese Laid-Open Application No. H8-330224 (U.S. Ser. No. 08/416,558), so as not to transfer it to the projection optical system PL.
- the exposure apparatus EX of this embodiment is manufactured by assembling various subsystems, including each structural element described in this application, so as to maintain predetermined mechanical accuracy, electrical accuracy, and optical accuracy. To assure these various accuracies, adjustments are performed before and after the assembly by adjusting the various optical systems to achieve the optical accuracy, by adjusting the various mechanical systems to achieve the mechanical accuracy, and by adjusting the various electrical systems to achieve the electrical accuracy.
- the process for assembling, from various subsystems, the exposure apparatus includes mechanical connections, wiring connections for electric circuits, ducting connections for air pressure circuits, and the like, that are performed for the various subsystems. Before the assembly process of these various subsystems to form the exposure device, individual assembly processes for each subsystem are performed.
- the entire adjustments are conducted to assure various accuracies as the exposure apparatus as a whole.
- the manufacturing of the exposure apparatus be performed in a clean room in which the temperature and cleanliness are controlled.
- a micro device such as a semiconductor device, is manufactured through a step 201 of designing functions and performance of the micro device, a step 202 of manufacturing a reticle (s) based on the design step, a step 203 of manufacturing a substrate that is a base material for the device, a step 204 of processing the substrate where a pattern of the reticle is exposed on the substrate by the exposure apparatus EX of the above-described embodiments, a step 205 of assembling the device (including dicing process, bonding process, and packaging process), and an inspection step 206 .
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Abstract
An exposure apparatus and method exposes, using an optical member, a pattern of a mask onto a substrate that is located on a substrate stage which is movable over a supporting plate. A liquid is provided between the optical member and the substrate, Fluid is sprayed toward the supporting plate to remove liquid from the supporting plate.
Description
- This is a Continuation of U.S. patent application Ser. No. 12/314,899 filed Dec. 18, 2008, which in turn is a Continuation of U.S. patent application Ser. No. 11/802,514 filed May 23, 2007 (now U.S. Pat. No. 7,573,560), which is a Division of U.S. patent application Ser. No. 10/972,366 filed Oct. 26, 2004 (now U.S. Pat. No. 7,301,606). The disclosure of each of the prior applications is hereby incorporated by reference herein in its entirety. The disclosure of each of the following priority applications is herein incorporated by reference in its entirety: Japanese Patent Application No. 2003-373084 filed Oct. 31, 2003 and Japanese Patent Application No. 2004-309324 filed Oct. 25, 2004.
- 1. Field of the Invention
- This invention relates to a supporting plate, a stage device, an exposure device, and an exposure method, and particularly to a supporting plate which is advantageously used with respect to a substrate on a stage, a stage device, an exposure apparatus, and an exposure method, at the time of exposure via a projection optical system that utilizes a liquid immersion technique.
- 2. Description of Related Art
- A semiconductor device and a liquid crystal display device are manufactured by a so-called photolithographic method which transfers a pattern formed on a mask onto a photosensitive substrate. An exposure apparatus which is used in this photolithographic method is provided with a mask stage which supports a mask, and a substrate stage which supports a substrate. The exposure apparatus transfers a mask pattern onto a substrate via a projection optical system while successively moving the mask stage and the substrate stage. Recently, higher resolution of the projection optical system corresponding to higher integration of a device pattern is demanded. The resolution of the projection optical system increases as an exposure wavelength which is used becomes shorter and a numerical aperture of the projection optical system becomes larger. Because of this, the exposure wavelength which is used in exposure apparatus has become shortened over the years, and the numerical aperture of projection optical systems has increased. Furthermore, an exposure wavelength of 248 nm of a KrF excimer laser is currently the mainstream, but an exposure wavelength of 139 nm of an ArF excimer laser also has been put into practice. In addition, in the case of performing exposure, a depth of focus (DOF) also becomes important as well as the resolution. The resolution R and the depth of focus δ can be expressed by the following equations.
-
R=k1·λ/NA (1) -
δ=±k2·λ/NA2 (2) - Here, λ is an exposure wavelength, NA is a numerical aperture of the projection optical system, and k1, k2 are process coefficients. According to equations (1) and (2), in order to increase the resolution R, by shortening the exposure wavelength λ and increasing the numerical aperture NA, it is understood that the depth of focus δ becomes narrower.
- When the depth of focus δ becomes too narrow, it is difficult to match a substrate surface with an image plane of the projection optical system, and there is a possibility that a focus margin may become insufficient at the time of an exposure operation. Therefore, a liquid immersion method has been proposed, as disclosed in, e.g., WO99/49504, as a method which substantially shortens an exposure wavelength and broadens the depth of focus. This liquid immersion method forms a liquid immersion area by filling the space between a lower surface of the projection optical system and a substrate surface with liquid such as water, an organic solvent, or the like, and improves the resolution by taking advantage of the fact that the wavelength of the exposure light in liquid becomes 1/n (n is normally approximately 1.2 through 1.6 depending on the index of refraction of the liquid) as compared to the wavelength in air, and increases the depth of focus by approximately n-times.
- The following problems exist in the above-mentioned apparatus that utilizes liquid immersion.
- In the above-mentioned exposure apparatus, exposure is performed in a state in which liquid is filled between a projection optical system and a wafer, so there are cases in which liquid may be splashed to locations external of the wafer if an unexpected operation is performed due to errors when a stage moves.
- For example, in the exposure apparatus described in WO99/49504, liquid is supplied between a projection optical system and a wafer by a liquid supply mechanism, and the supplied liquid is collected from the space between the wafer and the projection optical system by a liquid collection mechanism using vacuum suction or the like. However, once the operation of the liquid collection mechanism stops in a state in which the liquid supply mechanism is still operated, there is a possibility that the liquid on the wafer may increase and be splashed at the periphery.
- Because of this, in a liquid immersion exposure apparatus, there is a possibility that problems may occur such as device/member failure, leaking, rust/oxidation, etc. due to splashed liquid. Furthermore, in this case, there also is a problem that exposure processing cannot be performed well.
- It is a first object of this invention to provide a supporting plate which suppresses an effect due to leakage and entrance of exposure liquid, and which enables a good exposure processing, and to a stage device, an exposure apparatus, and an exposure method using that supporting plate.
- In order to accomplish the above-mentioned object, the following structure can be used. A supporting plate according to one embodiment of this invention includes a support surface which supports an object, and the supporting plate is made to be liquid repellent. In addition, a collection device is arranged to collect liquid from the supporting plate.
- In the supporting plate of this embodiment of the invention, even when the liquid is splashed or discharged to the supporting plate, this liquid can be collected by the collection device. Therefore, it is possible to suppress problems such as device/member failure, leaking, rust/oxidation, etc., or to reduce the effects of such problems. In addition, with this embodiment of the invention, the supporting plate is liquid repellent, so the splashed or discharged liquid cannot be spread over the support surface, and can easily move off the plate. Thus, a collection operation can be performed easily.
- A stage device according to one embodiment of this invention is provided with a movable body which holds a substrate, and in which liquid is supplied to a surface of the substrate, and a supporting plate which movably supports the movable body. When liquid is discharged to the supporting plate, a collection device is arranged which collects the discharged liquid.
- Therefore, in the stage device of this embodiment of the invention, even when liquid is splashed or discharged to the supporting plate from the surface of the substrate when the movable body moves or the like, the liquid can be collected by the collection device, so it is possible to suppress problems such as a device/member failure, leakage, rust/oxidation, etc., or to reduce the effects of such problems.
- An exposure apparatus according to one embodiment of this invention exposes a pattern of a mask onto a photosensitive substrate which is held to a substrate stage via a projection optical system. The stage device described above is used as a substrate stage, and a pattern image is projected onto the photosensitive substrate via liquid which is filled between an end portion of the projection optical system and the photosensitive substrate.
- An exposure method of one embodiment of this invention, in which a pattern of a mask is exposed to a substrate on a substrate stage, which is movably supported on a supporting plate, by a projection optical system includes a step of filling between an end portion of a projection optical system and the substrate with liquid, and a step of collecting the discharged liquid when the liquid is discharged to the supporting plate.
- Thus, according to exposure apparatus and exposure methods of some embodiments of this invention, even when the liquid which is filled between the end portion of the projection optical system and the photosensitive substrate is splashed/discharged to the supporting plate, this liquid can be collected by the collection device. Thus, it is possible to suppress problems such as a device/member failure, leakage, rust/oxidation, etc., or to at least reduce the effects of such problems.
- The invention will be described in conjunction with the following drawings in which like reference numerals designate like elements, and in which:
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FIG. 1 is a schematic structure diagram showing a supporting plate and a stage device of a first embodiment of this invention; -
FIG. 2 is a perspective view showing a stage device; -
FIG. 3 is an outer perspective view showing an X guide stage and a substrate supporting plate within the stage device; -
FIG. 4 is a perspective view showing a schematic structure of a supporting plate and a stage device according to a second embodiment of this invention; -
FIG. 5 is a perspective view showing a schematic structure of a supporting plate and a stage device according to a third embodiment of this invention; -
FIG. 6 is a schematic structure diagram showing an exposure device utilizing an embodiment of this invention; -
FIG. 7 is a schematic structural diagram showing the vicinity of an end portion of a projection optical system, a liquid supply mechanism, and a liquid collection mechanism; -
FIG. 8 is a plan view showing a positional relationship among a projection area of the projection optical system, the liquid supply mechanism, and the liquid collection mechanism; -
FIG. 9 is a diagram showing another embodiment of a collection portion arranged on the substrate supporting plate; -
FIG. 10 is a diagram showing another embodiment of the collection portion arranged on the substrate supporting plate; -
FIG. 11 is a perspective view showing another embodiment of the X guide stage; and -
FIG. 12 is a flowchart showing an example of a manufacturing process of a semiconductor device. - The following explains some examples of a supporting plate, a stage device, an exposure apparatus, and an exposure method which utilize aspects of this invention.
- A first embodiment explains a supporting plate according to some aspects of this invention, and a stage device provided with this supporting plate.
FIG. 1 is a schematic structural diagram showing an embodiment of a stage device utilizing some aspects of this invention. - A stage device ST shown in
FIG. 1 is mainly constituted by a substrate supporting plate (supporting plate) 41 which is supported by three or four points on abase plate 4 via a vibration isolation unit (removal device) 9, a substrate stage PST as an object (movable body) which supports the substrate P and moves a top surface (support surface) 41A of thesubstrate supporting plate 41, an Xlinear motor 47 which drives the substrate stage PST in an X axis direction (horizontal direction inFIG. 1 ), and a Ylinear motor 48 which drives the substrate stage PST in a Y axis direction (direction perpendicular to a paper plane ofFIG. 1 ). Thevibration isolation unit 9 is provided with an actuator such as an air mount, a voice coil motor, or the like in which an internal pressure can be controlled, and is constituted such that thesubstrate supporting plate 41 is driven in a direction perpendicular to thetop surface 41A by driving the actuator. - The substrate stage PST is constituted by a table portion PH which adsorbs (by suction) and holds the substrate P, and a stage portion PS which is movably arranged along with table portion PH. In addition,
air bearings 42, which are formed of a plurality of non-contact bearings, are arranged under the stage portion PS. Theair bearings 42 are provided withexit ports 42B which discharge air to the top surface (guide surface) 41A of thesubstrate supporting plate 41, andintake ports 42A which adsorb air between the lower surface (bearing surface) of the substrate stage PST and theguide surface 41A. Due to the balance between the pressing force of the outflow of air from theexit ports 42B and an adsorption force by theintake ports 42A, a predetermined space is maintained between the lower surface of the substrate stage PST (stage portion PS) and theguide surface 41A. That is, the substrate stage PST is supported in a non-contact manner by theair bearings 42 with respect to the top surface (guide surface) 41A of thesubstrate supporting plate 41, and is two-dimensionally movable within a plane parallel to thetop surface 41A, i.e., within an XY plane, and is micro-rotatable in a θZ direction of rotation about an axis parallel to a Z axis, which is perpendicular to thetop surface 41A. Furthermore, the table portion PH is movably arranged in the Z axis direction, θX direction (direction of rotation about an axis parallel to the X axis), and θY direction (direction of rotation about an axis parallel to the Y axis). The substrate stage drive mechanism is controlled by a control device CONT. That is, the table portion PH controls a Z position and an inclination angle of the substrate P, matches the surface of the substrate P with a predetermined plane position, and positions the substrate P in the X axis direction and Y axis direction. - Furthermore, spray ports (second removal devices) 75 which spray air are arranged in the vicinity of the bottom portion of the stage portion PS. The
spray ports 75 spray air, which removes any liquid remaining on thetop surface 41A of thesubstrate supporting plate 41, in a diagonally downward direction toward thetop surface 41A. A plurality of spray ports are formed in the four corners of the periphery of the stage portion PS (seeFIG. 2 ; however, inFIG. 2 , spray ports that are formed on the +X side and +Y side of the stage portion PS are not depicted), and are connected to an undepicted air supply source. - Moving mirrors 45 are arranged on the substrate stage PST (i.e., on a
surface 62 of the table portion PH). Furthermore,laser interferometers 46 are arranged at positions opposite to the moving mirrors 45. The position of the substrate P on the substrate stage PST in the two-dimensional directions X and Y, and the rotation angle are measured by thelaser interferometers 46 in real time, and the measurement results are provided to the control device CONT. The control device CONT positions the substrate P, which is supported on the substrate stage PST, by driving a substrate stage drive mechanism including a linear motor based on the measurement result of thelaser interferometers 46. Additionally, the movingmirrors 45 can be arranged on the side surfaces of the substrate stage PST, and the table portion PH can be made to be entirely flat. - Also arranged on the substrate stage PST (table portion PH) in the vicinity of the substrate P are a
supply nozzle 14 which supplies liquid 1 to the substrate P, and acollection nozzle 21 which collects the liquid 1 on the substrate P. -
FIG. 2 is a schematic perspective view showing the substrate stage PST and the substrate stage drive mechanism which drives the substrate stage PST. InFIG. 2 , the substrate stage PST (stage portion PS) is movably supported by anX guide stage 44 in the X axis direction. The substrate stage PST can be moved by an Xlinear motor 47 in the X axis direction by a predetermined stroke, while being guided with theX guide stage 44. The Xlinear motor 47 is provided with astator 47A which is arranged so as to extend on theX guide stage 44 in the X axis direction, and amovable portion 47B which is fixed to the substrate stage PST and arranged in correspondence with thestator 47A. Furthermore, themovable portion 47B is driven with respect to thestator 47A, so the substrate stage PST is moved in the X axis direction. Here, the substrate stage PST is supported in a non-contact manner by a magnetic guide formed of a magnet and an actuator, which maintains a predetermined gap in the Z axis direction with respect to theX guide stage 44. The substrate stage PST is moved by the Xlinear motor 47 in the X axis direction in a state in which the substrate stage PST is supported in a non-contact manner on theX guide stage 44. Furthermore, this is not depicted, but by arranging an encoder scale on theX guide stage 44 and measuring the encoder scale in the substrate stage PST, an encoder (encoder head) is provided which measures the relative positional relationship between theX guide stage 44 and the substrate stage PST. -
FIG. 3 is a diagram showing only theX guide stage 44 and thesubstrate supporting plate 41 of the stage device ST shown inFIG. 2 . - As shown in
FIG. 3 , theX guide stage 44 which is a stage structural body and arranged above thesubstrate supporting plate 41 is formed in a cross-sectional substantially concave shape which is opened upwardly. On the top surface, inclined surfaces (second inclined portion) 44A are formed which are inclined gradually downward to the substantially central portion in the width direction. In addition, at the low end portion (the lowest portion) of theinclined surfaces 44A, a plurality of drain ports (through holes) 44B are formed, spaced apart from each other in a longitudinal direction of theX guide stage 44. Thedrain ports 44B are formed so as to be positioned above thetop surfaces 41A of thesubstrate supporting plate 41, i.e., at positions such that when liquid is discharged from thedrain ports 44B, the liquid drips onto thetop surfaces 41A. - In addition, the
stator 47A of the Xlinear motor 47 and theinclined surfaces 44A (i.e., the concave portion of the X guide stage 44) are spaced apart from each other by using an undepicted spacer located within a concave portion of theX guide stage 44, so as to not prevent liquid from moving along theinclined surfaces 44A. - Additionally, the stage device ST includes a
collection device 71 that collects liquid discharged to thesubstrate supporting plate 41. Thecollection device 71 is constituted by a gutter (collection portion) 72 which is arranged along the outer circumference of thesubstrate supporting plate 41, awaste liquid tube 73 which is connected to thegutter 72, and asuction device 74 which suctions the liquid discharged to thegutter 72 via thewaste liquid tube 73. - The
gutter 72 is formed in a cross-sectional substantially U shape (concave shape), which is opened upwardly (seeFIG. 1 ), and liquid repellent coating (liquid repellent processing) of a fluorine or fluorine compound is performed on thebottom surface 72A and theside surface 72B within the concave portion. In addition, thebottom surface 72A of thegutter 72 is arranged at a position lower than thetop surface 41A of the supportingplate 41. A corner portion C1 (corner of the +X and −Y sides) connected to thewaste liquid tube 73 is made to be the lowest portion, and a corner portion C2 opposite to the corner portion C1 is made to be the highest position. This forms inclined portions, which are inclined in both the X axis direction and the Y axis direction. - Additionally, on the
top surface 41A of thesubstrate supporting plate 41 as well, in the same manner as thegutter 72, liquid repellent coating formed of fluorine or fluorine compound is performed, and thus liquid repellency is provided. - Furthermore, liquid repellent coating for the
substrate supporting plate 41 can be performed for the entiresubstrate supporting plate 41, not only for thetop surface 41A. - Meanwhile, on both ends in the longitudinal direction of the
X guide stage 44, a pair of Ylinear motors X guide stage 44 with the substrate stage PST in the Y axis direction. The respective Ylinear motors movable parts 48B which are arranged on both ends, in the longitudinal direction, of theX guide stage 44, andstators 48A which are arranged in correspondence with themovable parts 48B. Furthermore, as themovable parts 48B are driven by thestators 48A, theX guide stage 44 is moved in the Y axis direction along with the substrate stage PST. Furthermore, by adjusting the respective drives of the Ylinear motors X guide stage 44 can be rotatably moved in the θZ direction. Therefore, the substrate stage PST can be moved by the Ylinear motors X guide stage 44. - On both sides of the X axis direction of the
substrate supporting plate 41, guideportions 49 are arranged which are formed in an L shape as seen from a front view and guide the movement of theX guide stage 44 in the Y axis direction. In this embodiment,stators 48A of the Ylinear motors 48 are arranged on theflat portions 49B of theguide portions 49. Meanwhile,U-shaped guide members 50 are respectively arranged on both end portions in the longitudinal direction under theX guide stage 44. Theguide portions 49 are engaged to theguide members 50 and arranged so that the top surfaces (guide surfaces) 49A of theguide portions 49 face the internal surfaces of theguide members 50.Air bearings 51 which are non-contact bearings are arranged on the guide surfaces 49A of theguide portions 49, and theX guide stage 44 is supported in a non-contact manner with respect to the guide surfaces 49A. - Additionally,
air bearings 52 which are non-contact bearings exist respectively between thestators 48A of the Ylinear motors 48 and theflat portions 49B of theguide portions 49, and thestators 48A are supported in a non-contact manner with respect to theflat portions 49B of theguide portions 49 by theair bearings 52. Because of this, due to the conservation of momentum, according to the movement in the +Y direction (or −Y direction) of theX guide stage 44 and the substrate stage PST, thestators 48A are moved in the −Y direction (or +Y direction). Due to the movement of thestators 48A, a reaction force caused due to the movement of theX guide stage 44 and the substrate stage PST is canceled, and changes in a centroid position can be avoided. That is, thestators 48A function as a so-called countermass. - In the above-mentioned structured stage device ST, by controlling a supply amount of the liquid 1 from the
supply nozzle 14 and a collection amount of the liquid 1 by thecollection nozzle 21, in a condition in which a predetermined amount of liquid 1 is maintained on the surface of the substrate P, the substrate stage PST can be moved by the substrate stage drive mechanism along the supportingplate 41. - Here, due to reasons such as the occurrence of a problem in liquid collection by the
collection nozzle 21, etc., when liquid is splashed or discharged from the substrate, part of the liquid drips (or spills) onto theX guide stage 44, and another part drips (or spills) onto thetop surface 41A of thesubstrate supporting plate 41. - The liquid discharged to the
X guide stage 44 flows along theinclined surfaces 44A without remaining within the concave portion, and drips onto thetop surface 41A of thesubstrate supporting plate 41 via thedrain ports 44B at the lower end portion of theinclined surfaces 44A (seeFIG. 3 ). - Here, when the substrate stage PST is operated, air is sprayed out from the
spray ports 75, arranged in the bottom portion of the substrate stage PST (stage portion PS), to thetop surface 41A. Thetop surface 41A of the supportingplate 41 is provided with liquid repellency. Thus, the liquid discharged to thetop surface 41A is moved as liquid drops and is collected by thegutter 72. Furthermore, in thegutter 72 as well, liquid repellent processing is performed, and thebottom surface 72A is inclined, so liquid is discharged (rolls) below thetop surface 41A (i.e., below the surface of the substrate P) along thebottom surface 72A in a liquid drop state, and is discharged and collected from thewaste liquid tube 73 through suction by thesuction device 74. - Meanwhile, when the operation of the substrate stage PST is stopped, for example, due to an error, there is a possibility that liquid which is at a position in which air is not supplied from the
spray ports 75 may remain on thesubstrate supporting plate 41. In this case, by driving actuators (e.g., linear motors, voice coil motors, etc.) of thevibration isolation units 9, thetop surface 41A of thesubstrate supporting plate 41 is inclined with respect to a horizontal plane. By doing this, liquid drops roll over thetop surface 41A and fall into thegutter 72. At this time, regardless of the direction of inclination of thesubstrate supporting plate 41, thebottom surface 72A of thegutter 72 is inclined. Thus, the liquid can be collected via thewaste liquid tube 73, but by making the supportingplate 41 inclined at a position in which the corner portion C1 connected to thewaste liquid tube 73 is the lowest, the liquid drops are discharged to thegutter 72 in the vicinity of the corner portion C1, so the time until the liquid on the supportingplate 41 is discharged via thewaste liquid tube 73 can be shortened, which is preferable. - Thus, in this embodiment, even when the liquid supplied onto the substrate P is splashed and discharged to the
substrate supporting plate 41 for some reason, this liquid can be collected by thecollection device 71, so problems due to the splashed and discharged liquid, such as device/member failure, leaking, rust/oxidation, etc., can be avoided. Additionally, in this embodiment, thebottom portion 72A of thegutter 72 of thecollection device 71 has liquid repellency, and an inclined surface is provided which discharges the liquid below the supporting platetop surface 41A, so discharging and collection can be smoothly performed without clogging the liquid in thegutter 72. In addition, in this embodiment, liquid repellency is provided on thetop surface 41A of thesubstrate supporting plate 41, so the liquid cannot be easily attached to the surface, but rather can be easily dripped into thegutter 72. Additionally, in this embodiment, air is sprayed from thespray ports 75 to the supporting platetop surface 41A, so the liquid which remains on the surface can be easily removed, and even when the liquid is splashed onto the supporting platetop surface 41A during the drive of the substrate stage PST, the possibility of liquid being caught between theair bearings 42 and thetop surface 41A can be reduced, and this can contribute to the stable drive of the substrate stage PST. Furthermore, in this embodiment, even when the liquid cannot be removed with air spray, the liquid can be easily removed by inclining thesubstrate supporting plate 41 by thevibration isolation units 9. - Furthermore, in the embodiment which was thus described, the liquid which has been discharged can be collected by the
substrate supporting plate 41, so a structure is provided in which the liquid supplied onto the surface of the substrate P does not collect on the substrate stage PST. In this case, vibration due to the liquid collection can be controlled, and by covering a large part of the substrate surface by liquid, the temperature deterioration of the substrate due to air heat can be controlled. - Additionally, in this embodiment, in the
X guide stage 44 as well, the splashed/discharged liquid can be guided downwardly by theinclined surfaces 44A and discharged from thedrain ports 44B, so a heat effect due to the liquid remaining on theX guide stage 44 can be suppressed, and it is possible to suppress liquid from generating water stains and bacteria, as water tends to do. In addition, in theX guide stage 44 as well, in the same manner as the supporting platetop surface 41A and thebottom surface 72A of thegutter 72, it is preferable that liquid movement can be easily facilitated by applying liquid repellency. Furthermore, it is preferable that an encoder head or the like arranged on the substrate stage PST should be covered by a cover or the like so as to not contact the liquid. - Next, a second embodiment of a supporting plate and stage device utilizing aspects of this invention is explained.
FIG. 4 is a diagram schematically showing the substrate stage PST, thesubstrate supporting plate 41, and theX guide stage 44 within the stage device. Furthermore, inFIG. 4 , the moving mirror and the substrate on the substrate stage PST, and the gutter of thesubstrate supporting plate 41 are omitted from the drawing, although they would be present in the actual device. - In this embodiment, as shown in
FIG. 4 , on the top surface of the table portion PH of the substrate stage PST, agroove portion 76 is formed along an edge (outer circumference). Furthermore, on one side surface of the table portion PH, aslot portion 77 is formed which is positioned above aconcave portion 44C of theX guide stage 44, and extends in the Z axis direction, and is connected to thegroove portion 76. - Furthermore, in the
concave portion 44C of theX guide stage 44, adrain port 44B is formed at a position displaced in an outward direction from thesubstrate supporting plate 41 in the X direction. Awaste liquid tube 78 is connected to thewaste drain port 44B. Additionally, asuction device 79 which suctions liquid via thewaste liquid tube 78 is connected to thewaste liquid tube 78. Furthermore, in theX guide stage 44, thebottom portion 44D within theconcave portion 44C is formed so as to be inclined so that thedrain port 44B is located at the lowest part. - In the above-mentioned structure, the liquid applied onto the table portion PH is discharged to the
groove portion 76 and then to theconcave portion 44C of theX guide stage 44 via theslot portion 77. Furthermore, the liquid discharged to theconcave portion 44C is discharged to thedrain port 44B along the incline of thebottom portion 44D, and is discharged and collected from thewaste liquid tube 78 due to the suction of thesuction device 79. - Thus, in this embodiment, the liquid splashed and discharged to the
concave portion 44C of theX guide stage 44 does not reach thetop surface 41A of thesubstrate supporting plate 41, so it is possible to reduce the liquid amount which remains on thetop surface 41A. Additionally, a possibility of liquid being caught between the air bearings and thetop surface 41A can be further reduced. Therefore, the drive stability of the substrate stage PST can be further improved. - Next, a third embodiment of a supporting plate and stage device utilizing aspects of this invention is explained. The only difference between the third and second embodiments is the structure which discharges liquid from the
drain port 44B. That is, in this embodiment, thedrain port 44B of theX guide stage 44 is formed above thegutter 72. Furthermore, a waste liquid tube or the like is not connected to thedrain port 44B. - In the above-mentioned structure, the liquid discharged to the
concave portion 44C of theX guide stage 44 flows along the incline of thebottom portion 44D, and is collected by thegutter 72 as it naturally drips from thedrain port 44B. Thus, in this embodiment, the liquid splashed and discharged to theX guide stage 44 is not forcibly adsorbed, so generation of vibration due to suction can be suppressed. - Next, an exposure apparatus provided with the stage device ST shown in the above-mentioned first embodiment is explained with reference to
FIGS. 6-8 . In this embodiment, in an exposure apparatus which projects and exposes a pattern image of a mask onto a photosensitive substrate, an example is used in which a stage device of the above-mentioned embodiment is applied to a substrate stage which holds and moves a photosensitive substrate. Additionally, in this embodiment, the same symbols as in the above-mentioned first embodiment are used for the same structural elements, and their explanation is omitted or simplified. -
FIG. 6 is a schematic structural diagram showing an exposure apparatus utilizing aspects of this invention. - In
FIG. 6 , an exposure apparatus EX is equipped with a mask stage MST that supports a mask M, a stage device ST shown inFIGS. 1-3 having a substrate stage PST that supports a substrate (photosensitive substrate) P, an illumination optical system IL that illuminates with exposure light EL the mask M supported by the mask stage MST, a projection optical system PL that projects and exposes a pattern image of the mask illuminated by the exposure light EL onto the substrate P supported by the substrate stage PST, and a control device CONT that generally controls the operation of the entire exposure apparatus EX. To the control device CONT, a warning device K that generates warnings when abnormalities occur in the exposure process is connected. In addition, the exposure apparatus EX is equipped with amain column 3 that supports the mask stage MST and the projection optical system PL. Themain column 3 is placed on abase plate 4 mounted horizontally to the floor. An upperside step portion 3A and a lowerside step portion 3B that project inwardly are formed on themain column 3. - The exposure apparatus EX of this embodiment is an immersion exposure apparatus, in which an immersion method is used to substantially widen the depth of focus as well as increase the resolution by substantially shortening the exposure wavelength, and which is equipped with a
fluid supply mechanism 10 that supplies fluid 1 onto the substrate P and afluid collecting mechanism 20 that collects the fluid 1 from the substrate P. The exposure apparatus EX forms an immersion region AR2 at a part of the substrate P including a projection region AR1 of the projection optical system PL by the fluid 1 supplied from thefluid supply mechanism 10. In detail, the exposure apparatus EX fills the fluid 1 between anoptical element 2 located at a front end portion (lower end portion) of the projection optical system PL and a surface of the substrate P, and exposes the substrate P by projecting a pattern image of the mask M onto the substrate P through the fluid between the projection optical system PL and the substrate P. - In this embodiment, the explanation is made with an example using a scanning-type exposure apparatus (a so-called scanning stepper), as the exposure apparatus EX, that exposes a pattern formed on the mask M onto the substrate P while synchronously moving the mask M and substrate P in mutually different directions (opposite directions) in the scanning direction. In the below description, the direction that matches an optical axis AX of the projection optical system PL is designated as a Z-axis direction, a direction (scan direction) of the synchronous movement by the mask M and the substrate P in a plane perpendicular to the Z-axis direction is designated as an X-axis direction, and the direction (non-scan direction) perpendicular to the Z-axis direction and the X-axis direction is designated as a Y-axis direction.
- The term “substrate” includes a substrate on which a photoresist, which is a photosensitive material, is applied on a semiconductor wafer, and the term “mask” includes a reticle on which a device pattern to be reduced and projected on the substrate is formed.
- The illumination optical system IL is supported by a
support column 5 fixed on the upper part of themain column 3. The illumination optical system IL illuminates the mask M supported by the mask stage MST with the exposure light EL, and has an exposure light source, an optical integrator that uniformizes the intensity of the luminous flux ejected from the exposure light source, a condenser lens that collects the exposure light EL from the optical integrator, a relay lens system, and a variable field stop that sets an illumination region on the mask M by the exposure light EL in a slit shape. The predetermined illumination region on the mask M is illuminated with the exposure light EL having a uniform intensity distribution by the illumination optical system IL. As the exposure light EL ejected from the illumination optical system IL may be a bright line in the ultraviolet region (g-line, h-line, or i-line) ejected from a mercury lamp, ultraviolet light (DUV light), such as KrF excimer laser light (wavelength: 248 nm), and vacuum ultraviolet light (VUV light), such as ArF excimer laser light (wavelength: 193 nm) and F2 laser light (wavelength: 157 nm). In this embodiment, the ArF excimer laser light is used. - In this embodiment, pure water is used as the fluid 1. The pure water is transmissive to the bright line in the ultraviolet region (g-line, h-line, or i-line) ejected from the mercury lamp, for example, and the far ultraviolet light (DUV light), such as the KrF excimer layer light (wavelength: 248 nm).
- The mask stage MST supports the mask M and is equipped with an
opening 34A for passing the pattern image of the mask M in the center part thereof. On the upperside step portion 3A of themain column 3, amask support plate 31 is supported via avibration isolation unit 6. Anopening 34B for passing the pattern image of the mask M is also formed in the center part of themask support plate 31. A plurality ofair bearings 32, which are non-contact bearings, are provided on the lower surface of the mask stage MST. The mask stage MST is supported on the upper surface (guide surface) 31A of themask support plate 31 by theair bearing 32 without contact, and is movable two-dimensionally in the plane perpendicular to the optical axis AX of the projection optical system PL, that is, the XY plane, and minutely rotatable in the OZ direction, by the mask stage drive mechanism, such as a linear motor. Amovable mirror 35 is provided on the mask stage MST. Alaser interferometer 36 is provided at a position facing themovable mirror 35. The position in a two-dimensional direction and a rotational angle in the θZ direction (including rotational angles in the θX and θY directions depending on the case) of the mask M on the mask stage MST are calculated in real time by thelaser interferometer 36, and the result of such measurements is output to the control device CONT. The control device CONT controls the position of the mask M supported by the mask stage MST by driving the mask stage drive mechanism based on the result of measurement by thelaser interferometer 36. - The projection optical system PL projects and exposes the pattern of the mask M onto the substrate P at a predetermined projection magnification β, and consists of a plurality of optical elements including an optical element (lens) 2 provided at the front end portion on the substrate P side. These optical elements are supported by a lens barrel PK. In this embodiment, the projection optical system PL is a reduction system, in which the projection magnification β is ¼ or ⅕, for example. The projection optical system PL may be an equal magnification system or an enlargement system. An outer circumferential portion of the lens barrel PK is provided with a flange portion FLG. In addition, on the
lower side step 3B of themain column 3, a lensbarrel support plate 8 is supported via avibration isolation unit 7. By engaging the flange portion FLG of the projection optical system PL with the lens barrel support plate, the projection optical system PL is supported to the lensbarrel support plate 8. - The
optical element 2 at the front end portion of the projection optical system PL of this embodiment is provided attachably and detachably (replaceably) to the lens barrel PK. The fluid 1 in the immersion region AR2 contacts theoptical element 2. Theoptical element 2 is formed by fluorite. Because the fluorite has high attractiveness with water, the fluid 1 can be adhered substantially to the entire surface of thefluid contact surface 2 a of theoptical element 2. In other words, because the fluid (water) 1 having high adherence with thefluid contact surface 2 a of theoptical element 2 is supplied in this embodiment, the adherence between thefluid contact surface 2 a of theoptical element 2 and the fluid 1 is high. Therefore, an optical path between theoptical element 2 and the substrate P can be accurately filled with the fluid 1. In addition, theoptical element 2 may be quartz having high attractiveness with water. Moreover, by performing a hydrophilization (lyophilization) process to surface 2 a, the attractiveness with the fluid 1 can be increased. - A
plate member 2P is provided so as to surround theoptical element 2. A surface (i.e., lower surface) that faces the substrate P of theplate member 2P is a flat surface. The lower surface (fluid contact surface) 2 a of theoptical element 2 also is a flat surface, and the lower surface of theplate member 2P and the lower surface of theoptical element 2 are substantially flat. As a result, the immersion region AR2 can be well formed in a wide range. In addition, the lower surface of theplate member 2P can be processed with a surface treatment (hydrophilic treatment) similarly to theoptical element 2. -
FIG. 7 is an enlarged diagram showing the vicinity of thefluid supply mechanism 10,fluid collecting mechanism 20, and the front portion of the projection optical system PL. Thefluid supply mechanism 10 supplies the fluid 1 between the projection optical system PL and the substrate P, and is equipped with afluid supply portion 11 that can eject the fluid 1, and asupply nozzle 14 that is connected to thefluid supply portion 11 via asupply tube 15 and supplies the fluid ejected from thefluid supply portion 11 onto the substrate P. Thesupply nozzle 14 is positioned near the surface of the substrate P. Thefluid supply portion 11 is equipped with a tank for accommodating the fluid 1, a pressure pump, and the like. The fluid 1 is supplied onto the substrate P through thesupply tube 15 and thesupply nozzle 14. The fluid supply operation of thefluid supply portion 11 is controlled by the control device CONT, and the control device CONT can control the amount of fluid supplied per unit time to the substrate P by thefluid supply portion 11. - In the middle of the
supply tube 15, aflow meter 12 for measuring the amount of the fluid 1 supplied to the substrate P by the fluid supply portion 11 (amount of fluid supplied per unit time) is provided. Theflow meter 12 constantly monitors the amount of fluid 1 to be supplied on the substrate P and outputs the result of the measurement to the control device CONT. In addition, avalve 13 for opening and closing a flow path of thesupply tube 15 is provided in thesupply tube 15 between theflow meter 12 and thesupply nozzle 14. The open/close operation of thevalve 13 is controlled by the control device CONT. In addition, thevalve 13 according to this embodiment is of a so-called normal-off type that mechanically closes the flow path of thesupply tube 15 when a drive source (power source) of the exposure apparatus EX (control device CONT) is stopped due to, for example, power outage or the like. - The
fluid collecting mechanism 20 collects the fluid on the substrate P supplied by thefluid supply mechanism 10 and includes a collecting nozzle (absorption opening) 21 positioned near the surface of the substrate P, and avacuum system 25 connected to the collectingnozzle 21 via a collectingtube 24. Thevacuum system 25 is structured by including a vacuum source, and its operation is controlled by the control device CONT. By driving thevacuum system 25, the fluid 1 on the substrate P is collected through the collectingnozzle 21 along with the ambient gas (air). In addition, as thevacuum system 25, a vacuum system for a factory, in which the exposure apparatus EX is located, may be used without providing a separate vacuum pump on the exposure apparatus. - A gas/
fluid separator 22 that separates the fluid 1 and the gas absorbed by the collectingnozzle 21 is provided in the middle of the collectingtube 24. As described above, the fluid 1 on the substrate P and the ambient gas are collected by the collectingnozzle 21. The gas/fluid separator 22 separates the fluid 1 and the gas collected by the collectingnozzle 21. For the gas/fluid separator 22, a gravity separation method that separates the fluid and the gas by dropping the fluid using gravity through a hole portion, or a centrifugal separation method that separates the collected fluid and gas using centrifugal force, may be used. Thevacuum system 25 absorbs the gas separated by the gas/fluid separator 22. - A
dryer 23 that dries the gas separated by the gas/fluid separator 22 is provided in the collectingtube 24 between thevacuum system 25 and the gas/fluid separator 22. If a fluid composition is mixed in the gas separated by the gas/fluid separator 22, by drying the gas using thedryer 23 and by flowing the dried gas into thevacuum system 25, occurrence of troubles, such as malfunction of thevacuum system 25, originated from the fluid composition that is flowed thereinto, can be prevented. For thedryer 23, a method for removing the fluid composition by cooling the gas supplied by the gas/fluid separator 22 (gas in which the fluid composition is mixed) below the dew point of the fluid or a method for removing the fluid composition by heating the gas above the boiling point of the fluid, may be used. - On the other hand, the fluid 1 that has been separated by the gas/
fluid separator 22 is collected in afluid collecting portion 28 through asecond collecting tube 26. Theliquid collecting portion 28 is equipped with a tank that accommodates the collected fluid 1 and the like. The fluid 1 collected by thefluid collecting portion 28 may be, for example, disposed or recycled by returning it to thefluid supply portion 11 or the like after cleaning. In addition, aflow meter 27 that measures the amount of collected fluid 1 (the amount of fluid collected per a unit time) is provided in the middle of the second collecting tube between the gas/liquid separator 22 and thefluid collecting portion 28. Theflow meter 27 constantly monitors the amount of the fluid collected from the substrate P and outputs the result of the measurement to the control device CONT. As described above, the liquid 1 on the substrate P and the ambient gas are collected from the collectingnozzle 21. By separating the fluid 1 and ambient gas by the gas/fluid separator 22 and sending only the fluid composition to theflow meter 27, theflow meter 27 can accurately measure the amount of fluid uncollected from the substrate P. - In addition, the exposure apparatus EX is equipped with a
focus detection system 56 that detects a position of a surface of the substrate P supported by the substrate stage PST. Thefocus detection system 56 is equipped with alight projection portion 56A that projects a detection luminous flux onto the substrate P from a diagonal direction through the fluid 1, and alight receiving portion 56B that receives reflection light of the detection luminous flux reflected on the substrate P. The result of receiving light by the focus detection system 56 (light receiving portion 56B) is output to the control device CONT. Based on the result of detection by thefocus detection system 56, the control device CONT can detect the positional information of the surface of the substrate P in the Z-axis direction. In addition, by projecting a plurality of luminous fluxes by thelight projection portion 56A, the inclination information of the substrate P in the θX and θY directions also can be obtained. - In addition, as shown in a partial cross-sectional diagram in
FIG. 6 , thefluid supply mechanism 10 and thefluid collecting mechanism 20 are separately supported with respect to the lensbarrel support plate 8. As a result, vibration generated at thefluid supply mechanism 10 and thefluid collecting mechanism 20 is hardly transferred to the projection optical system PL through the lensbarrel support plate 8. -
FIG. 8 is a plane diagram showing the positional relationship of thefluid supply mechanism 10, thefluid collecting mechanism 20, and the projection region AR1 of the projection optical system PL. The projection region AR1 of the projection optical system PL is in a rectangular shape (slit shape) that is long and thin and extends in the Y-axis direction. Threesupply nozzles 14A-14C are positioned on the +X side, and two collectingnozzles nozzles vacuum system 25 via the collectingtube 24. Furthermore, at the position at which thesupply nozzles 14A-14C and the collectingnozzles supply nozzles 14A′-14C′ and collectingnozzles 21A′ and 21B′ are positioned. Thesupply nozzles 14A-14C and the collectingnozzles 21A′ and 21B′ are arranged alternately in the Y-axis direction, and thesupply nozzles 14A′-14C′ and the collectingnozzles supply nozzles 14A′-14C′ are connected to thefluid supply portion 11 via thesupply tube 15′, and the collectingnozzles 21A′ and 21B′ are connected to thevacuum system 25 via a collectingtube 24′. Similar to thesupply tube 15, aflow meter 12′ and avalve 13′ are provided in the middle of thesupply tube 15′. In addition, similar to the collectingtube 24, a gas/fluid separator 22′ and adryer 23′ are provided in the middle of the collectingtube 24′. - Next, steps for exposing the pattern of the mask M onto the substrate P using the above-described exposure apparatus EX are described.
- After loading the mask M on the mask stage MST and loading the substrate P onto the substrate stage PST, the control device CONT drives the
fluid supply portion 11 of thefluid supply mechanism 10 and supplies the predetermined amount of the fluid 1 per unit time onto the substrate P through thesupply tube 15 and thesupply nozzle 14. In addition, the control device CONT drives thevacuum system 25 of thefluid collecting mechanism 20 in accordance with the supply of the fluid 1 by thefluid supply mechanism 10, and collects the predetermined amount of the fluid 1 per unit time through the collectingnozzle 21 and the collectingtube 24. As a result, an immersion region AR2 for the fluid 1 is formed between theoptical element 2 at the front end portion of the projection optical system PL and the substrate P (step of filling fluid). To form the immersion region AR2, the control device CONT controls each of thefluid supply mechanism 10 and thefluid collecting mechanism 20 so as to make the amount of the fluid supplied to the substrate P and the amount of fluid collected from the substrate P become substantially the same amount. In addition, the control device CONT illuminates the mask M by the exposure light EL using the illumination optical system IL, and projects the image of the pattern on the mask M onto the substrate P through the projection optical system PL and the fluid 1. - At a time of scan exposure, a portion of a pattern image on the mask M is projected onto the projection region AR1. Synchronous to the mask M moving in the −X direction (or +X direction) at speed V with respect to the projection optical system PL, the substrate P moves in the +X direction (or −X direction) at speed β·V (where β is a projection magnification) via the substrate stage PST. Then, after the completion of the exposure in one shot region, the next shot region is moved to a scan start position by the stepping of the substrate P, and the exposure process for each shot region is sequentially performed using a step-and-scan method. In this embodiment, the fluid 1 is set to flow in the direction parallel to the direction of movement of the substrate P, that is, in the same direction as the direction of the movement of the substrate P.
- In other words, when performing the scan exposure by moving the substrate P in the scan direction (−X direction) shown by an arrow Xa (see
FIG. 8 ), supply and collection of the fluid 1 by thefluid supply mechanism 10 and thefluid collecting mechanism 20 are performed using thesupply tube 15, thesupply nozzle 14A-14C, the collectingtube 24, and the collectingnozzles optical element 2 at the front end portion of the projection optical system PL and the substrate P. - On the other hand, when performing the scan exposure by moving the substrate P in the scan direction (+X direction) shown with an arrow Xb (see
FIG. 8 ), supply and collection of the fluid 1 by thefluid supply mechanism 10 and thefluid collecting mechanism 20 are performed using thesupply tube 15′, thesupply nozzles 14A′-14C′, the collectingtube 24′, and the collectingnozzles 21A′ and 21B′. That is, when the substrate P moves in the +X direction, the fluid 1 is supplied between the projection optical system PL and substrate P using thesupply nozzle 14′ (14A′-14C′), and the fluid 1 on the substrate P is collected by the collectingnozzle 21′ (21A′ and 21B′) along with the ambient gas. Therefore, the fluid 1 flows in the +X direction so as to fill between theoptical element 2 at the front end portion of the projection optical system PL and the substrate P. In this case, the fluid 1 supplied via thesupply nozzle 14 flows as if it is pulled between theoptical element 2 and the substrate P in accordance with the movement of the substrate P in the −X direction or +X direction. Therefore, the fluid 1 can be supplied easily between theoptical element 2 and the substrate P even if the supply energy of the fluid supply mechanism 10 (fluid supply portion 11) is small. Therefore, by switching the direction of the flow of the fluid 1 depending on the scan direction, the space between theoptical element 2 and the substrate P can be filled with the fluid 1 even when the substrate P is scanned in either direction of the +X direction and the −X direction. Therefore, high resolution and wide depth of focus can be obtained. - During the exposure process, the result of measurement by the
flow meter 12 provided in thefluid supply mechanism 10 and the result of the measurement by theflow meter 27 provided in thefluid collecting mechanism 20 are constantly output to the control device CONT. The control device CONT compares the result of measurement by theflow meter 12, that is, the amount of fluid supplied on the substrate P by theliquid supply mechanism 10, and the result of measurement by theflow meter 27, that is, the amount of fluid collected from the substrate P by theliquid collecting mechanism 20, and controls thevalve 13 of thefluid supply mechanism 10 based on the result of the comparison. In detail, the control device CONT determines a difference between the amount of fluid supplied on the substrate P (the result of measurement by the flow meter 12) and the amount of fluid collected from the substrate P (the result of measurement by the flow meter 27), and controls thevalve 13 based on whether the determined difference exceeds a predetermined tolerance (threshold value). As described above, since the control device CONT controls each of thefluid supply mechanism 10 and thefluid collecting mechanism 20 so as to make the amount of the fluid supplied to the substrate P and the amount of fluid collected from the substrate P substantially the same, the above-described determined difference becomes substantially zero under a condition in which the fluid supply operation by thefluid supply mechanism 10 and the fluid collection operation by thefluid collecting mechanism 20 are normally performed. - If the determined difference is more than the tolerance, that is, if the amount of the fluid collected is extremely small compared to the amount of fluid supplied, the control device CONT determines, as a result of the malfunction of the collecting operation by the
fluid collecting mechanism 20, that a sufficient amount of the fluid is not collected. At this time, the control device CONT determines that abnormalities, such as malfunctions, occurred at thevacuum system 25 of thefluid collecting mechanism 20, for example. In addition, to prevent a leaking of the fluid 1 due to the fact that the fluid 1 cannot be normally collected by thefluid collecting mechanism 20, the control device CONT closes the flow path of thesupply tube 15 by operating thevalve 13 of thefluid supply mechanism 10, and stops the supply of the fluid 1 to the substrate P by thefluid supply mechanism 10. Accordingly, the control device CONT compares the amount of fluid supplied to the substrate P from thefluid supply mechanism 10 and the amount of the fluid collected by thefluid collecting mechanism 20, detects the abnormality of the collecting operation of thefluid collecting mechanism 20 based on the result of the comparison, and stops the supply of the fluid 1 to the substrate P when the fluid 1 is oversupplied or abnormalities are detected. In addition, the control device CONT may generate a warning via the above-described warning device K when the abnormality is detected. In addition, the control device CONT may display the abnormality to a display device by providing the display device to the above-described warning device K. Furthermore, by providing a water leakage sensor at least a part (e.g.,gutter member 72 or groove portion) of the collectingdevice 71, the abnormality can be detected based on the result of the detection by the water leakage sensor. - At this time, the fluid 1 that has been supplied onto the substrate P is not collected by the
fluid collecting mechanism 20, as described in the above first embodiment, but instead outflows directly from the substrate stage PST or indirectly onto theupper surface 41A of thesubstrate support plate 41 via theX guide stage 44. A part of the outflown fluid is collected by flowing into thegutter member 72. In addition, the fluid remaining on the support plateupper surface 41A can be collected by flowing the fluid into thegutter member 72 by the control device CONT driving (an actuator of) thevibration actuation unit 9 to tilt thesubstrate support plate 41. - As described above, in this embodiment, by filling the optical path between the
optical element 2 and the substrate P with fluid 1, high resolution and large depth of focus can be obtained, and even when the fluid scatters or outflows from the substrate P for any reason, troubles, such as malfunction of the device and/or members, electric leakage, and/or rust/oxidation, are prevented beforehand by collecting the fluid, allowing smooth execution of the exposure processes. - Some preferred embodiments according to this invention are described above with reference to the attached drawings. However, this invention is not limited to these embodiments. One of ordinary skill in the art would be able to achieve various modifications and corrections.
- For example, in the above embodiments, a
gutter member 72 is provided in the vicinity of thesubstrate support plate 41 as a collecting portion of the collectingdevice 71. However, the invention is not limited to this. As shown inFIG. 9 , for example, by forming agroove portion 81 by astep portion 41B, which is formed lower than thesubstrate top surface 41A, along the entire circumference of the edge of thesubstrate support plate 41, and awall member 80 provided on the side surface of thesubstrate support plate 41, the fluid scattered and outflown to thesubstrate support plate 41 is collected by thegroove portion 81. In this case, it also is preferred that the fluid repellent treatment is performed in thegroove portion 81 to smoothly collect the fluid, and that thestep portion 41B is inclined. - Furthermore, as shown in
FIG. 10 , without using the wall member, thegroove portion 81 may be provided on the entire circumference of the outer circumference of thesubstrate support plate 41, and thisgroove portion 81 may function as a collecting portion. - The
groove portion 81 need not necessarily be provided on the entire circumference of thesubstrate support plate 41. For example, twogroove portions 81 may be provided on the outer circumference of thesubstrate support plate 41 in the X direction (scan direction), and twogutter members 72 may be provided along the outer circumference of thesubstrate support plate 41 in the Y direction (non-scan direction). Accordingly, portions of the collectingdevices 71 disclosed in the embodiment may be combined. - In addition, in the above embodiments, the description was made with the
X guide stage 44 having a cross-section schematically in a U-shape. However, as shown inFIG. 11 , it may be schematically in an H shape in a cross-sectional view. Because a large load is applied in the width direction (left-right direction inFIG. 11 ) by the air from the air bearing provided on the substrate stage PST, thesidewall 44C of theX guide stage 44 is made in a shape symmetrical in the up-down direction by forming in the H shape, to prevent unbalanced load from being applied to theX guide stage 44. In addition, theinclined surface 44A may be provided only on the upper portion side. However, to prevent the unbalanced load, it is preferred that it be provided symmetrically on the lower surface side as well. - Furthermore, in the above embodiments, the fluid remaining on the substrate
upper surface 41A is removed by tilting thestage support plate 41 using thevibration isolation unit 9. However, a structure in which the substrateupper surface 41A is made an inclined surface that inclines with respect to the horizontal plane may also be used. In this case, since the position of the substrate surface in the Z-axis direction changes due to the movement of the substrate stage PST, the position of the surface of the substrate P should be corrected by driving the position of the table portion PH in the Z-axis direction depending on the position of the substrate stage PST. - Similarly, to make the removal of the fluid remaining on the table portion PH smooth, the surface of the table portion PH may be made an inclined surface or processed with the fluid repellent treatment.
- Moreover, when tilting the
substrate support plate 41, and when the surface of the table portion PH is made an inclined surface, it is preferred to incline thesubstrate support plate 41 such that the side on which members that are not supposed to contact the fluid, such as movable mirrors and fiducial marks, are not provided on the lower side. - As described above, the fluid 1 according to the embodiments is composed of pure water. Advantages of using such a fluid are that it can be obtained in large amounts at semiconductor manufacturing facilities and that there are no negative effects to the photoresist or the optical elements (lens) on the substrate P. In addition, because pure water has no negative effects to the environment, and because the amount of impurities is extremely low, it is expected to clean the surface of the substrate P and the surface of the optical elements provided on the front end surface of the projection optical system PL.
- The refractive index of pure water (water) with respect to the exposure light EL having the wavelength of approximately 193 nm is about 1.44, when the ArF excimer laser light (wavelength: 193 nm) is used as the light source for the exposure light EL. Therefore, high resolution is obtained by shortening the wavelength by 1/n, that is, approximately 139 nm on the substrate P. In addition, since the depth of focus is increased by approximately n times compared to that in the air, that is, approximate 1.44 times, when it is only sufficient to secure the depth of focus that is approximately the same as when using in the air, the numeral aperture for the projection optical system PL can be increased, and thereby the resolution increases as well.
- However, fluids other than water may be used. For example, if the light source for the exposure light EL is a F2 laser, the F2 laser light is not transmitted in water. Thus, a fluid of a fluorine system, such as fluorine oil and perfluorinated polyether (PFPE), that can transmit the F2 laser light may be used as the fluid 1. In addition, it is also possible to use, as the fluid 1, a material that has transmissivity with respect to the exposure light EL, has high refractivity, and is stable with respect to photoresist applied on the projection optical system PL and the surface of the substrate P (e.g., cedar oil).
- In addition, in these embodiments, the
optical element 2 is mounted on the front end of the projection optical system PL. The optical element mounted on the front end of the projection optical system PL can be an optical plate used for adjusting the optical characteristics of the projection optical system PL, such as aberrations (spherical aberration, coma etc.). Instead, it may be a parallel plate that can transmit the exposure light EL. - In each of the above-described embodiments, the shape of the above-described nozzles is not particularly limited. For example, the supply and collection of the fluid 1 may be performed by two pairs of nozzles provided at the long sides of the projection region AR1. In this case, to allow the supply and collection of the fluid 1 to be performed in any one of the +X direction and the −X direction, arrangements may be made by positioning the supply nozzles and the collection nozzles above and below.
- For the substrate P in each of the above-described embodiments, not only a semiconductor wafer for manufacturing semiconductor devices, but also glass substrates for manufacturing display devices, ceramic wafer for manufacturing thin-film magnetic heads, original plates for manufacturing masks and reticles (synthetic quartz and silicon wafer) used in an exposure device, may be used.
- In the above-described embodiments, an exposure apparatus is provided in which the optical path between the projection optical system PL and the substrate P is locally filled with a fluid. However, this invention can be used in an immersion exposure apparatus in which a stage that holds a substrate to be exposed is moved in a fluid tank, as disclosed in Japanese Laid-Open Patent Application No. H06-124873, or an immersion exposure apparatus in which a fluid tank having a predetermined depth is formed on a stage and the substrate is held therein, as disclosed in Japanese Laid-Open Patent Application No. H10-303114.
- As the exposure apparatus EX, in addition to the scan-type exposure apparatus (scanning stepper) using a step-and-scan method that scan-exposes the pattern on the mask M by synchronously moving the mask M and the substrate P, a projection exposure apparatus (stepper) using a step-and-repeat method in which the pattern on the mask M is entirely exposed in a state where the mask M and the substrate P are stationary, and the substrate P is sequentially stepped, may be used. In addition, this invention may be used in an exposure apparatus using a step-and-stitch method in which at least two patterns are partially superimposingly transferred onto the substrate P.
- In addition, this invention may be used in a twin-stage type exposure apparatus, which is equipped two wafer stages (substrate stages) and in which the two wafer stages are switched between an alignment position and an exposure position, as disclosed in Japanese Laid-Open Patent Application No. 2001-160530. In this case, the
fluid supply portion 11 and thefluid collecting portion 28 may be maintained driven when the two wafer stages are switched. This is because, as described above, the fluid 1 from thefluid supply portion 11 can be collected via thesubstrate support plate 41. As a result, the throughput for the twin stage type exposure device can be further increased. - As for the type of the exposure apparatus EX, the invention is not limited to the exposure apparatus for manufacturing semiconductor elements that exposes semiconductor element patterns on the substrate P. It may be used for an exposure apparatus for manufacturing liquid crystal display elements or for manufacturing displays, as well as an exposure apparatus for manufacturing thin-film magnetic heads, image shooting elements (CCD), reticles or masks.
- When using a linear motor for the substrate stage PST or the mask stage MST (see, e.g., U.S. Pat. No. 5,623,853 or U.S. Pat. No. 5,528,118), it is preferred to use either an air flow type that uses an air bearing as a type of flowing the stages with respect to the support plate, or a magnetic flow type that uses Lorentz force. In addition, each of the stages PST and MST may be of a type that moves along a guide, or each may be of a guideless type that provides no guides.
- For the drive mechanism for each of the stages PST and MST, a flat motor may be used that drives each of the stages PST and MST using magnetic force by facing a magnetic unit in which magnets are two-dimensionally positioned, and an armature unit in which coils are two-dimensionally positioned. In this case, either one of the magnetic unit and the armature unit should be connected to the stages PST and MST, and the other one of the magnetic unit and the armature unit should be provided on the moving surface side of the stages PST and MST.
- The reaction force generated by the movement of the substrate stage PST may be transmitted mechanically to the floor (ground) using a frame member, as described in Japanese Laid-Open Patent Application No. H08-166475 (U.S. Pat. No. 5,528,118), so as not to transfer it to the projection optical system PL. The reaction force generated by the movement of the mask stage MST may be transmitted mechanically to the floor (ground) using a frame member, as described in Japanese Laid-Open Application No. H8-330224 (U.S. Ser. No. 08/416,558), so as not to transfer it to the projection optical system PL.
- The exposure apparatus EX of this embodiment is manufactured by assembling various subsystems, including each structural element described in this application, so as to maintain predetermined mechanical accuracy, electrical accuracy, and optical accuracy. To assure these various accuracies, adjustments are performed before and after the assembly by adjusting the various optical systems to achieve the optical accuracy, by adjusting the various mechanical systems to achieve the mechanical accuracy, and by adjusting the various electrical systems to achieve the electrical accuracy. The process for assembling, from various subsystems, the exposure apparatus includes mechanical connections, wiring connections for electric circuits, ducting connections for air pressure circuits, and the like, that are performed for the various subsystems. Before the assembly process of these various subsystems to form the exposure device, individual assembly processes for each subsystem are performed. After completing the assembly processes of the various subsystems to form the exposure device, the entire adjustments are conducted to assure various accuracies as the exposure apparatus as a whole. In addition, it is preferred that the manufacturing of the exposure apparatus be performed in a clean room in which the temperature and cleanliness are controlled.
- As shown in
FIG. 12 , a micro device, such as a semiconductor device, is manufactured through astep 201 of designing functions and performance of the micro device, astep 202 of manufacturing a reticle (s) based on the design step, astep 203 of manufacturing a substrate that is a base material for the device, astep 204 of processing the substrate where a pattern of the reticle is exposed on the substrate by the exposure apparatus EX of the above-described embodiments, astep 205 of assembling the device (including dicing process, bonding process, and packaging process), and aninspection step 206. - While the invention has been described with reference to preferred embodiments thereof, it is to be understood that the invention is not limited to the preferred embodiments or constructions. To the contrary, the invention is intended to cover various modifications and equivalent arrangements. In addition, while the various elements of the preferred embodiments are shown in various combinations and configurations, that are exemplary, other combinations and configurations, including more, less or only a single element, are also within the spirit and scope of the invention.
Claims (25)
1. An exposure method which exposes, using an optical member, a pattern of a mask onto a substrate that is located on a substrate stage which is movable over a supporting plate, the method comprising the steps of:
providing liquid between the optical member and the substrate; and
spraying a fluid toward the supporting plate to remove liquid from the supporting plate.
2. The exposure method of claim 1 , wherein the fluid is a gas.
3. The exposure method of claim 2 , wherein the gas is air.
4. The exposure method of claim 1 , wherein the spraying includes spraying the fluid from a plurality of spray ports.
5. The exposure method of claim 4 , wherein the plurality of spray ports spray the fluid in different directions.
6. The exposure method of claim 1 , wherein the spraying includes spraying the fluid diagonally downward toward the supporting plate.
7. The exposure method of claim 1 , further comprising collecting the liquid removed from the supporting plate.
8. The exposure method of claim 1 , further comprising collecting the liquid disposed on the substrate from above the substrate.
9. An exposure method for exposing a substrate by irradiating exposure light onto the substrate through a liquid, the method comprising:
holding the substrate on a substrate stage which is movable over a supporting plate;
providing liquid to a space between an optical member and the substrate which is held by the substrate stage;
collecting liquid on the substrate which is held by the substrate stage; and
spraying a fluid toward the supporting plate to remove liquid from the supporting plate.
10. The exposure method of claim 9 , wherein the fluid is a gas.
11. The exposure method of claim 10 , wherein the gas is air.
12. The exposure method of claim 9 , wherein the spraying includes spraying the fluid from a plurality of spray ports.
13. The exposure method of claim 12 , wherein the plurality of spray ports spray the fluid in different directions.
14. The exposure method of claim 9 , wherein the spraying includes spraying the fluid diagonally downward toward the supporting plate.
15. The exposure method of claim 9 , further comprising collecting the liquid removed from the supporting plate.
16. The exposure method of claim 9 , wherein the collecting liquid on the substrate includes collecting the liquid from above the substrate.
17. An exposure apparatus which exposes a pattern onto a substrate, the exposure apparatus comprising:
a supporting plate having a surface;
a substrate stage which holds the substrate and is movable over the supporting plate;
a liquid supply device having a supply nozzle which supplies liquid to the substrate; and
a spraying device that sprays a fluid toward the supporting plate to remove liquid from the supporting plate.
18. The exposure apparatus of claim 17 , wherein the fluid sprayed by the spaying device is a gas.
19. The exposure apparatus of claim 17 , wherein the spraying device includes a plurality of spray ports.
20. The exposure apparatus of claim 19 , wherein the plurality of spray ports spray the fluid in different directions.
21. The exposure apparatus of claim 17 , wherein the spraying device sprays the fluid diagonally downward toward the supporting plate.
22. The exposure apparatus of claim 17 , further comprising a collection device that collects the liquid removed from the supporting plate.
23. The exposure apparatus of claim 17 , further comprising a collection device that collects the liquid disposed on the substrate from above the substrate.
24. The exposure apparatus of claim 17 , further comprising:
a first collection device that collects the liquid disposed on the substrate from above the substrate; and
a second collection device that collects the liquid removed from the supporting plate.
25. An exposure apparatus which exposes a pattern onto a substrate, the exposure apparatus comprising:
a supporting plate;
a substrate stage which holds the substrate and is movable over the supporting plate;
a bearing device which is arranged in a space between the supporting plate and the substrate stage, and has a first outflow device which sprays a fluid and an intake device which absorbs a fluid; and
a second outflow device which sprays a fluid to remove liquid from the supporting plate.
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US11/802,514 US7573560B2 (en) | 2003-10-31 | 2007-05-23 | Supporting plate, stage device, exposure apparatus, and exposure method |
US12/314,899 US20090109419A1 (en) | 2003-10-31 | 2008-12-18 | Supporting plate, stage device, exposure apparatus, and exposure method |
US12/805,328 US20100290014A1 (en) | 2003-10-31 | 2010-07-26 | Supporting plate, stage device, exposure apparatus, and exposure method |
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US12/805,328 Abandoned US20100290014A1 (en) | 2003-10-31 | 2010-07-26 | Supporting plate, stage device, exposure apparatus, and exposure method |
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Also Published As
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US20070222966A1 (en) | 2007-09-27 |
US20050094125A1 (en) | 2005-05-05 |
JP2005159322A (en) | 2005-06-16 |
US20090109419A1 (en) | 2009-04-30 |
US7301606B2 (en) | 2007-11-27 |
US7573560B2 (en) | 2009-08-11 |
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