WO2005010962A1 - 露光装置及びデバイス製造方法、並びに露光装置の制御方法 - Google Patents
露光装置及びデバイス製造方法、並びに露光装置の制御方法 Download PDFInfo
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- WO2005010962A1 WO2005010962A1 PCT/JP2004/010991 JP2004010991W WO2005010962A1 WO 2005010962 A1 WO2005010962 A1 WO 2005010962A1 JP 2004010991 W JP2004010991 W JP 2004010991W WO 2005010962 A1 WO2005010962 A1 WO 2005010962A1
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- Prior art keywords
- liquid
- substrate
- exposure apparatus
- optical system
- exposure
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Classifications
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- 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
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- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
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- G03F7/70866—Environment aspects, e.g. pressure of beam-path gas, temperature of mask or workpiece
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- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
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- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
- G03F7/70491—Information management, e.g. software; Active and passive control, e.g. details of controlling exposure processes or exposure tool monitoring processes
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- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
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- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/7085—Detection arrangement, e.g. detectors of apparatus alignment possibly mounted on wafers, exposure dose, photo-cleaning flux, stray light, thermal load
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- G—PHYSICS
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- 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
- G03F7/70858—Environment aspects, e.g. pressure of beam-path gas, temperature
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- G—PHYSICS
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- 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
- G03F7/70858—Environment aspects, e.g. pressure of beam-path gas, temperature
- G03F7/709—Vibration, e.g. vibration detection, compensation, suppression or isolation
Definitions
- the present invention relates to an exposure apparatus that exposes a substrate through a projection optical system and a liquid, a device manufacturing method using the exposure apparatus, and a control method of the exposure apparatus.
- a semiconductor device or a liquid crystal display device is manufactured by a so-called photolithography technique in which a pattern formed on a mask is transferred onto a photosensitive substrate.
- An exposure apparatus used in the photolithographic process has a mask stage for supporting a mask and a substrate stage for supporting a substrate. The mask stage and the substrate stage are sequentially moved, and the pattern of the mask is projected onto the projection optical system. Is transferred to the substrate via
- further improvement in the resolution of the projection optical system has been desired in order to cope with higher integration of device patterns.
- the resolution of the projection optical system increases as the exposure wavelength used decreases and as the numerical aperture of the projection optical system increases. For this reason, the exposure wavelength used in the exposure apparatus is becoming shorter year by year, and the numerical aperture of the projection optical system is also increasing.
- the exposure wavelength of the mainstream is 248 nm of KrF excimer laser, but 193 nm of shorter wavelength ArF excimer laser is also being put to practical use.
- the depth of focus (DOF) is as important as the resolution.
- the resolution R and the depth of focus ⁇ 5 are respectively represented by the following equations.
- ⁇ is the exposure wavelength
- ⁇ ⁇ is the numerical aperture of the projection optical system
- k, k 2 are the process coefficients.
- the space between the lower surface of the projection optical system and the substrate surface is filled with a liquid such as water or an organic solvent to form an immersion area, and the wavelength of the exposure light in the liquid is 1 /
- the resolution is improved by utilizing the fact that n (n is the refractive index of the liquid is usually about 1.2 to 1.6), and the depth of focus is expanded to about n times.
- n is the refractive index of the liquid is usually about 1.2 to 1.6
- the depth of focus is expanded to about n times.
- An object of the present invention is to provide an exposure apparatus and a device manufacturing method capable of performing processing, and a control method of the exposure apparatus. It is another object of the present invention to provide an exposure apparatus, a device manufacturing method, and a method of controlling an exposure apparatus, which can suppress the influence of leakage or infiltration of an exposure liquid and can perform favorable exposure processing.
- the present invention employs the following configuration corresponding to FIGS. 1 to 22 shown in the embodiment.
- a projection optical system (PL) for projecting the pattern image onto the substrate (P);
- a liquid supply mechanism (10) for supplying a liquid (1) between the projection optical system (PL) and the substrate (P);
- the liquid supply mechanism (10) is provided with an exposure apparatus (EX) for stopping the supply of the liquid (1) when an abnormality is detected.
- EX exposure apparatus
- the present invention when an abnormality is detected, the supply of the liquid by the liquid supply mechanism is stopped, so that it is possible to prevent leakage or intrusion of the liquid, or to prevent the damage from spreading. Therefore, it is possible to prevent the occurrence of inconveniences such as the failure or commission of peripheral devices and members due to the liquid, or the fluctuation of the environment where the substrate is placed, or to reduce the influence of such inconveniences.
- an exposure apparatus for exposing a substrate (P) by irradiating the substrate (P) with exposure light (EL) via a liquid (1) comprising:
- a projection optical system (P L) for projecting the pattern image onto the substrate (P) via the liquid (1);
- An exposure apparatus (EX) which stops power supply to the electric equipment (47, 48) when an abnormality is detected, in order to prevent electric leakage due to the adhesion of the liquid (1).
- the power supply to the electric device is stopped to prevent the leakage due to the adhesion of the liquid. It is possible to suppress the occurrence of inconvenience such as failure of the equipment itself, or to reduce the damage due to it.
- a projection optical system (P L) for projecting the pattern image onto the substrate (P) via the liquid (1);
- an exposure apparatus (EX) which stops the intake from the intake port (42A, 66) when an abnormality is detected.
- the exposure apparatus includes, for example, an intake port of an air bearing (a gas bearing) for supporting the stage apparatus in a non-contact manner with respect to the guide surface, and an intake port of a holder apparatus for sucking and holding a mask and a substrate.
- various intake ports are provided, if liquid flows into these intake ports, the vacuum system (suction system) such as a vacuum pump that flows through those intake ports will fail.
- abnormality is detected means that exposure of the substrate through the liquid, that is, detection of a situation that adversely affects the immersion exposure is detected. refers to not only the abnormality concerning the flow of the liquid, the substrate is moved with retained 'by such abnormality relating to operation of the stage is detected: related, also includes, in the et to be connected to an exposure apparatus This is a concept that also includes the detection of an abnormality in the device.
- an exposure apparatus for exposing a substrate (P) by irradiating the substrate (P) with exposure light (EL) via a liquid (1):
- a projection optical system (PL) for projecting the pattern image onto the substrate (P) via the liquid (1);
- An exposure apparatus provided with 3, 72, 76
- EX Exposure apparatus
- a liquid is suctioned from the liquid suction port (recovery port) of the liquid recovery mechanism using a vacuum system
- the collected liquid component flows into the vacuum system (suction system)
- failure of the vacuum system may occur. Will cause.
- the liquid and the gas sucked from the suction port are separated into gas and liquid by a separator, and the gas separated by the separator is further dried by a drier, so that the liquid component (wet (Including gas) can be prevented.
- a substrate stage (PST) that can move while holding the substrate (P), the substrate stage (PST) having a first area (LA1) thereon;
- the substrate stage is configured so as not to have a positional relationship where the liquid cannot be held between the first region and the second region.
- a substrate stage (P ST) capable of holding and moving the substrate (P);
- a second detector (80D) provided on the base member (41) for detecting the liquid (1);
- An exposure apparatus including a control unit (CONT) for controlling the operation of an exposure apparatus according to detection results of a first detector (80C) and a second detector (80D) is provided.
- the operation of the exposure apparatus is controlled in accordance with the detection results of the first detector and the second detector provided at mutually different positions.
- Appropriate measures can be taken according to Therefore, it is possible to reduce the time required for the return work after the liquid leakage occurs, and to prevent a decrease in the operation rate of the exposure apparatus.
- the controller determines that the diffusion range of the leaked liquid is relatively narrow, and for example, the liquid supply mechanism Take appropriate measures according to the range, such as stopping supply.
- an exposure apparatus for exposing a substrate by irradiating the substrate with exposure light via a liquid comprising:
- the controller controls the movement range of the stage when the liquid is held between the projection optical system and the stage, and the movement of the stage when the liquid is not held between the projection optical system and the stage.
- An exposure apparatus is provided that limits the range to a smaller range.
- the eighth aspect of the present invention for example, during exposure of the substrate on the stage, it is possible to keep the liquid between the projection optical system and the stage satisfactorily. If the liquid is not held during this time, other operations such as substrate exchange can be performed smoothly.
- a ninth aspect of the present invention there is provided a device manufacturing method characterized by using the exposure apparatus (EX) of the above aspect.
- a method for controlling an exposure apparatus (EX) for exposing a substrate by irradiating the substrate with exposure light via a liquid comprising: projecting a pattern image onto the substrate.
- Optical system liquid supply mechanism (10) for supplying liquid (1) to the image plane side of the projection optical system, devices (47, 48) driven by electric energy, and gas suction
- PL Optical system
- liquid supply mechanism 10 for supplying liquid (1) to the image plane side of the projection optical system
- devices 47, 48 driven by electric energy
- gas suction A method for controlling an exposure apparatus, comprising components of an exposure apparatus including an apparatus (42, PH) having a function of performing the following, and being connected to an external related apparatus:
- a method for controlling an exposure apparatus including: According to the control method of the exposure apparatus of the present invention, when an abnormality occurs in a related apparatus inside the exposure apparatus or outside the exposure apparatus, and the signal is a signal indicating an abnormality that affects the exposure of the substrate and the like.
- FIG. 1 is a schematic configuration diagram showing a first embodiment of the exposure apparatus of the present invention.
- FIG. 2 is a perspective view showing a substrate stage.
- FIG. 3 is a schematic configuration diagram showing the vicinity of the distal end of the projection optical system, a liquid supply mechanism, and a liquid recovery mechanism.
- FIG. 4 is a plan view showing the positional relationship between the projection area of the projection optical system and the liquid supply mechanism and the liquid recovery mechanism.
- FIG. 5 is a schematic cross-sectional view for explaining the recovery device provided on the substrate stage.
- FIG. 6 is a schematic diagram for explaining a detector including an optical fiber according to the second embodiment of the exposure apparatus of the present invention.
- FIG. 7 is a schematic diagram for explaining a detector including an optical fiber according to the second embodiment of the exposure apparatus of the present invention.
- FIG. 8 is a side view showing an example of the arrangement of detectors having optical fibers.
- FIG. 9 is a plan view of FIG.
- FIG. 10 is a side view showing another arrangement example of the detector having the optical fiber.
- FIG. 11 is a plan view showing another embodiment of a detector provided with an optical fiber.
- FIG. 12 is a perspective view showing another arrangement example of the detector including the optical fiber.
- FIG. 13 is a schematic diagram showing another embodiment of the detector including the optical fiber.
- FIG. 14 is a schematic diagram for explaining a detector including a prism according to the third embodiment of the exposure apparatus of the present invention.
- FIG. 15 is a schematic diagram for explaining a detector including a prism according to the third embodiment of the exposure apparatus of the present invention.
- FIG. 16 is a plan view showing an example of the arrangement of detectors having a prism.
- FIG. 17 is a diagram illustrating another example of use of a detector including a prism.
- FIG. 18 is a schematic configuration diagram showing another arrangement example of the detector having the prism.
- FIGS. 19 (a) and (b) show another embodiment of a detector provided with an optical fiber.
- FIGS. 20 (a) and (b) are views for explaining another embodiment of the present invention.
- FIGS. 21 (a) and (b) are diagrams for explaining another embodiment of the present invention.
- FIG. 22 is a flowchart showing an example of a semiconductor device manufacturing process.
- FIG. 23 is a block diagram showing the connection relationship between the control device and related devices outside the exposure device and various devices inside the exposure device controlled by the control device based on detection signals from various detectors of the exposure device of the present invention. is there.
- FIG. 24 is a flowchart showing the control contents of the control device of the exposure apparatus of the present invention.
- FIG. 1 is a schematic configuration diagram showing a first embodiment of the exposure apparatus of the present invention.
- an exposure apparatus EX illuminates a mask stage MST supporting a mask M, a substrate stage PST supporting a substrate P, and a mask M supported by the mask stage MST with exposure light EL.
- the projection optical system PL which projects and exposes the buttered image of the mask M illuminated with the illumination optical system I and the exposure light EL onto the substrate P supported by the substrate stage PST, and the overall operation of the exposure apparatus EX
- a control device C 0 T for overall control is provided.
- the control device CONT is connected to an alarm device K that issues an alarm when an abnormality occurs in the exposure processing.
- the exposure apparatus EX includes a main column 3 that supports the mask stage MST and the projection optical system PL.
- the main column 3 is set on a base plate 4 placed horizontally on the floor.
- the main column 3 is formed with an upper step 3A and a lower step 3B protruding inward.
- the control device is connected to various components constituting the exposure device and related devices outside the exposure device, and the control content of the control device will be described later.
- the exposure apparatus EX of the present embodiment is an immersion exposure apparatus to which the immersion method is applied to substantially shorten the exposure wavelength to improve the resolution and to substantially widen the depth of focus.
- the exposure apparatus EX uses the liquid 1 supplied from the liquid supply mechanism 10 at least while the pattern image of the mask M is being transferred onto the substrate P to expose a part of the projection area AR 1 of the projection optical system PL on the substrate P. in the P specifically to form the liquid immersion area AR 2, the exposure apparatus EX, the liquid 1 filled between the optical element 2 and the substrate P on the surface of the end portion of the projection optical system PL (termination), this The substrate P is exposed by projecting a buttered image of the mask M onto the substrate P via the liquid 1 between the projection optical system PL and the substrate P and the projection optical system PL.
- a scanning type exposure apparatus (a so-called “exposure apparatus”) that exposes a pattern formed on the mask M onto the substrate P while synchronously moving the mask M and the substrate P in directions different from each other (reverse direction) in the scanning direction.
- an example will be described in which a scanning stepper is used.
- the direction that coincides with the optical axis AX of the projection optical system PL is the Z-axis direction
- the synchronous movement direction (scanning direction) between the mask M and the substrate P in a plane perpendicular to the Z-axis direction is the X-axis.
- the direction perpendicular to the Z-axis direction and the X-axis direction is the Y-axis direction.
- the directions of rotation (tilt) around the X axis, Y axis, and Z axis are defined as 0 °, ⁇ °, and directions, respectively.
- the “substrate” includes a semiconductor wafer coated with a photoresist as a photosensitive material
- the “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 above 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 provides an exposure light source and an optical illuminator for equalizing the illuminance of a light beam emitted from the exposure light source. Equipped with a condenser lens that collects the exposure light EL from the evening and the optical integration, a relay lens system, and a variable field stop that sets the illumination area on the mask M with the exposure light EL in a slit shape. are doing. A predetermined illumination area on the mask M is illuminated by the illumination optical system IL with exposure light E having a uniform illuminance distribution.
- the exposure light EL emitted from the illumination optical system IL includes, for example, ultraviolet bright lines (g-rays, h-rays, i-rays) emitted from a mercury lamp, and KrF excimer laser light (wavelength: 248 nm). Deep ultraviolet light (DUV light) or A r F Excimer laser beam (wavelength 1 9 3 nm) and F 2 laser beam (wavelength: 1 5 7 nm) vacuum ultraviolet light (VUV light) is used. In the present embodiment, ArF excimer laser light is used. In the present embodiment, pure water is used as the liquid 1.
- Pure water is not only A r F excimer laser light, but also, for example, ultraviolet emission lines (9 lines, h lines, i lines) emitted from a mercury lamp and K r F excimer laser light (wavelength 248 nm). And other deep ultraviolet light (DUV light) can also be transmitted.
- the mask stage MST supports the mask M, and has an opening 34A at the center thereof through which the pattern image of the mask M passes.
- a mask surface plate 31 is supported on an upper step portion 3 A of the main column 3 via a vibration isolating unit 6.
- An opening 34B through which the pattern image of the mask M passes is also formed at the center of the mask base 31.
- a plurality of non-contact bearings (air bearings) 32 are provided on the lower surface of the mask stage MST.
- the mask stage MST is supported in a non-contact manner with respect to the upper surface (guide surface) 31 of the mask surface plate 31 by ⁇ averaging 32 ⁇ .
- the mask stage drive mechanism such as a linear motor drives the projection optical system PL. It can be moved two-dimensionally in a plane perpendicular to the optical axis AX, that is, in the XY plane, and can be slightly rotated in the 0 Z direction.
- a movable mirror 35 that moves with respect to the projection optical system PL together with the mask stage MST is provided on the mask stage MST.
- a laser interferometer 36 is provided at a position facing the movable mirror 35.
- the position of the mask M on the mask stage MST in the two-dimensional direction and the rotation angle in the direction are measured in real time by the laser interferometer 36, and the measurement results are obtained. Is output to the control unit CONT.
- the control device CONT controls the position of the mask M supported by the mask stage MST by driving the mask stage driving mechanism based on the measurement result of the laser interferometer 36.
- the projection optical system PL projects and exposes the pattern of the mask M on the substrate P at a predetermined projection magnification / ?, and includes an optical element (lens) 2 provided at the tip of the substrate P side. It is composed of a plurality of optical elements, and these optical elements are supported by a barrel P ⁇ .
- the projection optical system PL is a reduction system whose projection magnification 3 is, for example, 1/4 or 1/5.
- the projection optical system PL may be either a unity magnification system or an enlargement system.
- a flange portion FLG is provided on the outer peripheral portion of the lens barrel PK.
- a lens barrel surface plate '8 is supported on a lower step portion 3B of the main column 3 via a vibration isolating unit 7.
- the projection optical system PL is supported by the barrel base 8 by the engagement of the flange portion FLG of the projection optical system PL with the barrel base 8.
- the optical element 2 at the distal end of the projection optical system PL according to the present embodiment is provided so as to be detachable (replaceable) from the lens barrel PK.
- the liquid 1 in the liquid immersion area AR 2 is tangent to the optical element 2.
- the optical element 2 is made of fluorite. Since fluorite has a high affinity for water, the liquid 1 can be brought into close contact with almost the entire liquid contact surface 2a of the optical element 2. That is, in the present embodiment, the liquid (water) 1 having a high affinity for the liquid contact surface 2a of the optical element 2 is supplied, so that the liquid contact surface 2a of the optical element 2 and the liquid The adhesiveness with the liquid 1 is high, and the optical path between the optical element 2 and the substrate P can be reliably filled with the liquid 1.
- the optical element 2 may be quartz having a high affinity for water. Further, the liquid contact surface 2a of the optical element 2 may be subjected to a hydrophilic (lyophilic) treatment to increase the affinity with the liquid 1.
- a plate member 2P is provided so as to surround the optical element 2. The surface (that is, the lower surface) of the plate member 2P facing the substrate P is a flat surface. The lower surface (liquid contact surface) 2a of the optical element 2 is also a flat surface, and the lower surface of the plate member 2P and the lower surface of the optical element 2 are almost flush. Thereby, the liquid immersion area AR2 can be favorably formed in a wide range.
- the substrate stage (movable member) PST is provided so as to be movable by sucking and holding the substrate P via a substrate holder (substrate holding member) PH, and has a plurality of non-contact bearings, gas bearings (air) on its lower surface. Bearings) 42 are provided.
- Base A substrate surface plate 41 is supported on the plate 4 via a vibration isolating unit 9.
- the air bearing 42 has an outlet 42 B for blowing gas (air) to the upper surface (guide surface) 41 A of the substrate surface plate 41, a lower surface (bearing surface) of the substrate stage PST and a guide surface.
- a suction port 42 A for sucking gas between 41 A is provided, and the substrate is balanced by the repulsion force of the gas blown out from the outlet 42 and the suction force by the suction port 42 A.
- a certain gap is maintained between the lower surface of the stage PST and the guide surface 41A.
- the substrate stage PST is supported in a non-contact manner with respect to the upper surface (guide surface) 41 A of the substrate surface plate (base member) 41 by an air bearing 42 and is driven by a substrate stage drive mechanism such as a linear motor. It can be two-dimensionally moved and slightly rotated in the direction perpendicular to the optical axis AX of the projection optical system PL, that is, in the XY plane.
- the substrate holder PH is provided so as to be movable in the Z-axis direction, the direction, and the direction.
- the substrate stage driving mechanism is controlled by the controller CONT. That is, the substrate holder P H ′ controls the focus position (Z position) and the tilt angle of the substrate P so that the surface of the substrate P is aligned with the image plane of the projection optical system P by the smart focus method and the smart leveling method. And position the board P in the X-axis and Y-axis directions.
- a movable mirror 45 that moves with respect to the projection optical system PL together with the substrate stage PST is provided on the substrate stage PST.
- a laser interferometer 46 is provided at a position facing the movable mirror 45.
- the two-dimensional position and rotation angle of the substrate P on the substrate stage PST are measured in real time by the laser interferometer 46, and the measurement results are output to the control device CONT.
- the controller CONT drives the substrate stage drive mechanism including the linear motor based on the measurement result of the laser interferometer 46 to position the substrate P supported on the substrate stage PST.
- An auxiliary plate 43 is provided on the substrate stage PST (substrate holder PH) so as to surround the substrate P (see FIG. 2).
- the auxiliary plate 43 has a flat surface at almost the same height as the surface of the substrate P held by the substrate holder PH.
- Substrate P When exposing the edge area, the liquid plate 1 can be held under the projection optical system PL by the auxiliary plate 43.
- a collection port (suction port) 61 of a collection device 60 for collecting the liquid 1 flowing out of the substrate P is provided outside the auxiliary plate 43 in the substrate holder PH.
- the recovery port 61 is an annular groove formed so as to surround the auxiliary plate 43, in which a liquid absorbing member 62 made of a sponge-like member, a porous body or the like is arranged.
- FIG. 2 is a schematic perspective view showing the substrate stage PST and a substrate stage driving mechanism for driving the substrate stage PST.
- the substrate stage PST is supported by an X guide stage 44 so as to be movable in the X-axis direction.
- the substrate stage PST can be moved at a predetermined stroke in the X-axis direction by the X linear motors 4, 7 while being guided by the X 'guide stage 44.
- the X linear motor 47 has a stator 47 A provided on the X guide stage 44 so as to extend in the X-axis direction, and is fixed to the substrate stage PST provided corresponding to the stator 4 77 ⁇ . Mover 47 B is provided. Then, when the mover 47B is driven with respect to the stator 47A, the substrate stage PST moves in the X-axis direction.
- the substrate stage PST is supported in a non-contact manner by a magnetic guide composed of a magnet and an actuator that maintains a predetermined gap in the Z-axis direction with respect to the X guide stage 44.
- the substrate stage PST is moved in the X-axis direction by the X linear motor 47 while being supported by the X guide stage 44 in a non-contact manner.
- a pair of Y linear motors 48 that can move the X guide stage 44 in the Y axis direction together with the substrate stage PST are provided.
- Each of the Y linear motors 48 includes a mover 48 B provided at both ends in the longitudinal direction of the X guide stage 44, and a stator 48 A provided corresponding to the mover 48 B. It has. Then, the mover 48 B is driven relative to the stator 48 A, so that the X guide stage 44 moves in the Y-axis direction together with the substrate stage PST. To do. By adjusting the drive of each of the Y linear motors 48, the X guide stage 44 can be rotated in the 0 ° direction.
- the substrate stage PS can be moved substantially integrally with the X guide stage 44 in the axial direction and the 0 ° direction by the linear motor 48.
- guide portions 49 formed in an L shape in a front view and guiding the movement of the X-guide stage 44 in the ⁇ -axis direction are provided. I have.
- Guide part 49 is supported on base plate 4 (FIG. 1).
- the ⁇ stator 48 ⁇ of the linear motor 48 is provided on the flat portion 49 # of the guide portion 49.
- concave guide members 50 are provided at both ends in the longitudinal direction of the lower surface of the X guide stage 44.
- Guide part 4 9 is a guided part
- the upper surface (guide surface) 49 A of the guide portion 49 and the inner surface of the guided member 50 are provided so as to engage with 50.
- a non-contact bearing gas bearing (air bearing) 51 is provided on the guide surface 4 : 9> A of the guide part 49, and the X guide stage 44 is provided on the guide surface 49A.
- a gas bearing (air bearing) 52 which is a non-contact bearing is interposed between the stator 48 A of the Y linear motor 48 and the flat portion 49 B of the guide portion 49.
- the stator 48A is non-contact supported by the air bearing 52 against the flat portion 49B of the guide portion 49.
- FIG. 3 is an enlarged view showing the liquid supply mechanism 10, the liquid recovery mechanism 20, and the vicinity of the tip of the projection optical system PL.
- the liquid supply mechanism 10 supplies the liquid 1 between the projection optical system PL and the substrate P, and includes a liquid supply unit 11 capable of sending the liquid 1 and a liquid supply unit 11.
- a supply nozzle 14 is connected to the supply unit 11 via a supply pipe 15 and supplies the liquid 1 sent from the liquid supply unit 11 onto the substrate P.
- the supply nozzle 14 is arranged close to the surface of the substrate P.
- the liquid supply unit 11 includes a tank that stores the liquid 1, a pressure pump, and the like, and supplies the liquid 1 onto the substrate P via the supply pipe 15 and the supply nozzle 14.
- the liquid supply operation of the liquid supply unit 11 is controlled by the controller CONT, and the controller CONT can control the amount of liquid supply per unit time on the substrate P by the liquid supply unit 11.
- a flow meter 12 for measuring the amount of the liquid 1 supplied from the liquid supply section 11 onto the substrate P (liquid supply amount per unit time).
- the flow meter 12 constantly monitors the amount of the liquid 1 supplied onto the substrate P, and outputs the measurement result to the control device CONT.
- a valve 13 for opening and closing the flow path of the supply pipe 15 is provided between the flow meter 12 and the supply nozzle 14 in the supply pipe 15. The opening and closing operation of the valve 13 is controlled by the control device C ⁇ NT.
- valve 13 in this embodiment is a so-called valve that mechanically closes the flow path of the supply pipe 15 when the drive source (power supply) of the exposure apparatus EX (controller CONT) stops due to, for example, a power failure. It is a one-off system.
- the liquid recovery mechanism 20 is for recovering the liquid 1 on the substrate P supplied by the liquid supply mechanism 10, and includes a recovery nozzle (suction port) 21 arranged close to the surface of the substrate P.
- a vacuum system (suction system) 25 connected to the collection nozzle 21 via a collection tube 24 is provided.
- the vacuum system 25 includes a vacuum pump, and its operation is controlled by the controller CONT.
- the liquid 1 on the substrate P is collected together with the surrounding gas (air) through the collection nozzle 21.
- a vacuum system of a factory where the exposure apparatus EX is disposed may be used without providing a vacuum pump in the exposure apparatus.
- a gas-liquid separator 22 that separates the liquid 1 and the gas sucked from the collection nozzle 21 is provided in the middle of the collection pipe 24.
- the recovery nozzle From 2 1 the surrounding gas is recovered together with the liquid 1 on the substrate P.
- the gas-liquid separator 22 separates the liquid 1 and the gas collected from the collection nozzle 21.
- the collected liquid and gas are circulated through a pipe member having a plurality of holes, and the liquid and gas are separated by dropping the liquid through the holes by gravity. It is possible to adopt a gravity separation type device that separates and a centrifugal separation type device that separates the collected liquid and gas using centrifugal force. Then, the vacuum system 25 sucks the gas separated by the gas-liquid separator 22. A dryer 23 for drying the gas separated by the gas-liquid separator 22 is provided between the vacuum system 25 and the gas-liquid separator 22 in the recovery pipe 24.
- the gas separated by the gas-liquid separator 22 contains a liquid component
- the gas is dried by the dryer 23 and the dried gas is flown into the vacuum system 25 to obtain the liquid component. It is possible to prevent inconveniences such as failure of the vacuum system 25 caused by the inflow of water.
- the dryer 23 for example, a device that removes liquid components by cooling gas supplied from the gas-liquid separator 22 (gas in which liquid components are mixed) to a temperature lower than the dew point of the liquid, for example, a cooler or a device that removes a liquid component by heating the liquid to a boiling point or higher, such as a heater, can be used.
- the liquid 1 separated by the gas-liquid separator 22 is recovered by the liquid recovery unit 28 via the second recovery pipe 26.
- the liquid recovery unit 28 includes a tank or the like for storing the recovered liquid 1.
- the liquid 1 recovered in the liquid recovery unit 28 is, for example, discarded or cleaned, returned to the liquid supply unit 11 or the like, and reused.
- the amount of collected liquid 1 (the amount of liquid recovered per unit time) is measured between the gas-liquid separator 22 and the liquid recovery unit 28 in the middle of the second collection pipe 26.
- a flow meter 27 is provided. The flow meter 27 constantly monitors the amount of the liquid 1 collected from the substrate P, and outputs the measurement result to the control device CONT. As described above, the gas around the substrate P is also collected from the collection nozzle 21 together with the liquid 1 on the substrate P.
- the exposure apparatus EX includes a focus detection system 56 that detects the position of the surface of the substrate P supported by the substrate stage PST.
- the focus detection system 56 includes a light projecting unit 56 A that projects a detection light beam onto the substrate P from obliquely above via the liquid 1, and a light receiving unit that receives reflected light of the detection light beam reflected by the substrate P. 5 6 B '.
- the light reception result of the focus detection system 56 (light receiving section 56 B) is output to the control device CONT.
- the control device CONT can detect the position information of the surface of the substrate P in the Z-axis direction based on the detection result of the focus detection system 56. Further, by projecting a plurality of detection light beams from the light projecting unit 56A, tilt information of the substrate P in the 0X and 0Y directions can be detected.
- the focus detection system 56 can detect not only the substrate P but also surface position information of an object placed on the image plane side of the projection optical system PL.
- the focus detection system 56 detects the surface position information of the object (substrate P) via the liquid 1, but detects the object (substrate P) outside the liquid immersion area AR2 without the liquid 1.
- a focus detection system that detects surface position information can also be employed. As shown in the partial cross-sectional view of FIG.
- FIG. 4 is a plan view showing a positional relationship between the liquid supply mechanism 10 and the liquid recovery mechanism 20 and the projection area AR1 of the projection optical system PL.
- the projection area AR 1 of the projection optical system PL has a rectangular shape (slit shape) elongated in the Y-axis direction, and three supply nozzles 1 on the + X side so that the projection area AR 1 is sandwiched in the X-axis direction. 4 A to 14 C are arranged, and two collection nozzles 21 A and 21 B are arranged on the —X side.
- the supply nozzles 14A to 14C are connected to the liquid supply unit 11 via a supply pipe 15, and the recovery nozzles 21A and 21B are connected to a vacuum system 25 via a recovery pipe 24. It is connected. Also supply nose The supply nozzles 14A 'to 14C' and the collection nozzles 21A 'and 21' are located at positions where the nozzles 14A to 14C and the collection nozzles 21A and 21B are rotated by approximately 180 °. 'And are arranged. The supply nozzles 14 ⁇ to 14C and the collection nozzles 21A 'and 21B' are arranged alternately in the axial direction, and the supply nozzles 14A 'to 14C' and the collection nozzles 21 ⁇ and 2 ⁇ .
- FIG. 5 is a view showing a recovery device 60 for recovering the liquid 1 flowing out of the substrate ⁇ .
- the supply nozzles 14A 'to 14C''' are connected to the liquid supply unit 11 via the supply pipe 15 '
- the collection nozzles 21A' and 21 B ' is connected to a vacuum system 25 via a recovery pipe 24'.
- a flow meter 12 ′ and a valve 13 ′ are provided similarly to the supply pipe 15.
- a gas-liquid separator 22 ′ and a dryer 23 are provided in the middle of the recovery pipe 24 ′, similarly to the recovery pipe 24.
- FIG. 5 is a view showing a recovery device 60 for recovering the liquid 1 flowing out of the substrate ⁇ .
- a collecting device 60 is disposed at the collecting port (suction port) 61 formed in a ring shape so as to surround the auxiliary plate 43 on the substrate holder ⁇ ⁇ , and is disposed at the collecting port 61.
- a liquid absorbing member 6 made of a porous material such as porous ceramics.
- the liquid absorbing member 62 is an annular member having a predetermined width, and can hold a predetermined amount of the liquid 1.
- a flow path 63 communicating with the recovery port 61 is formed inside the substrate holder ⁇ , and the bottom of the liquid absorbing member 62 arranged in the recovery port 61 is in contact with the flow path 63.
- a plurality of liquid recovery holes 64 are provided between the substrate ⁇ on the substrate holder ⁇ and the auxiliary plate 43. These liquid recovery holes 64 are also connected to the channel 63.
- a plurality of protrusions 65 for supporting the back surface of the substrate ⁇ are provided on the upper surface of the substrate holder (substrate holding member) ⁇ which holds the substrate ⁇ .
- Each of the protrusions 65 is provided with a suction hole 66 for sucking and holding the substrate.
- Each of the suction holes 66 is connected to a conduit 67 formed inside the substrate holder.
- the flow path 63 connected to each of the recovery port 61 and the liquid recovery hole 64 is connected to one end of a pipe 68 provided outside the substrate holder PH.
- the other end of the pipe 68 is connected to a vacuum system 70 including a vacuum pump.
- a gas-liquid separator 71 is provided in the middle of the pipe 68, and a dryer 72 is provided between the gas-liquid separator 71 and the vacuum system 70.
- the vacuum system 70 By driving the vacuum system 70, the liquid 1 is collected together with the surrounding gas from the collection port 61. Further, even if the liquid 1 penetrates from between the substrate P and the auxiliary plate 43 and flows around the back surface of the substrate P, the liquid is recovered from the recovery port 64 together with the surrounding gas.
- the gas separated by the gas-liquid separator 71 and dried by the dryer 72 flows into the vacuum system 70.
- the liquid 1 separated by the gas-liquid separator 71 flows into a liquid recovery unit 73 having a tank or the like capable of storing the liquid 1.
- the liquid 1 collected in the liquid recovery section 73 is, for example, discarded or cleaned and returned to the liquid supply section 11 or the like for reuse.
- the channel 67 is connected to one end of a channel 69 provided outside the substrate holder PH.
- the other end of the conduit 69 is connected to a vacuum system 74 including a vacuum pump provided outside the substrate holder PH.
- a gas-liquid separator 75 is provided in the middle of the pipe 69, and a dryer 76 is provided between the gas-liquid separator 75 and the vacuum system 74. Further, the gas-liquid separator 75 is connected to a liquid recovery unit 73 including a tank or the like capable of storing the liquid 1.
- a procedure for exposing the pattern of the mask M to the substrate P using the above-described exposure apparatus EX will be described with reference to FIG.
- the controller CONT drives the liquid supply section 11 of the liquid supply mechanism 10 to A predetermined amount of the liquid 1 is supplied onto the substrate P per unit time via the supply pipe 15 and the supply nozzle 14.
- the controller CONT has a liquid supply mechanism 1
- the vacuum system 25 of the liquid recovery mechanism 20 is driven in accordance with the supply of the liquid 1 by 0, and a predetermined amount of the liquid 1 is recovered per unit time via the recovery nozzle 21 and the recovery pipe 24.
- a liquid immersion area AR 2 of the liquid 1 is formed between the optical element 2 at the tip of the projection optical system PL and the substrate P.
- the controller CONT operates the liquid supply mechanism 1 so that the liquid supply amount on the substrate P and the liquid recovery amount from the substrate P become substantially the same. 0 and the liquid recovery mechanism 20 are each controlled.
- the control unit CONT illuminates the mask M with the exposure light EL by the illumination optical system IL, and projects the pattern image of the mask M onto the substrate P via the projection optical system PL and the liquid 1.
- a partial pattern image of the mask M is projected onto the projection area AR1, and is synchronized with the movement of the mask M in the -X direction (or + X direction) at a speed V with respect to the projection optical system PL.
- the substrate P moves through the substrate stage PST in the + X direction (or -X direction) at a speed /? ⁇ V (3 is a projection magnification).
- the liquid 1 is set to flow in the same direction as the moving direction of the substrate P, in parallel with the moving direction of the substrate P.
- the supply pipe 15 and the supply nozzles 14A to 14C are collected.
- the supply and recovery of the liquid 1 by the liquid supply mechanism 10 and the liquid recovery mechanism 20 are performed by using the pipe 24 and the recovery nozzles 21A and 21B.
- the liquid 1 is supplied between the projection optical system PL and the substrate P from the supply nozzle 14 (14A to 14C), and the collection nozzle 21 ( 2 1 A, 21 B)
- the liquid 1 on the substrate P is collected together with the surrounding gas from the 1A, 21 B) and filled between the optical element 2 at the tip of the projection optical system PL and the substrate P—the liquid 1 in the X direction.
- scanning exposure is performed by moving the substrate P in the scanning direction (+ X direction) indicated by the arrow Xb (see FIG.
- the supply and recovery of liquid 1 is performed. That is, when the substrate P moves in the + X direction, the liquid 1 is supplied between the projection optical system P and the substrate P from the supply nozzles 14 ′ (14 A ′ to 14 C ′). At the same time, the liquid 1 on the substrate P is recovered together with the surrounding gas from the recovery nozzle 2 (21A ', 21B,), and the liquid between the substrate P and the optical element 2 at the tip of the projection optical system PL is collected. Liquid 1 flows in + X direction to fill.
- the liquid 1 supplied via the supply nozzle 14 flows as it is drawn between the optical element 2 and the substrate P as the substrate P moves in the X direction.
- the liquid 1 can be easily supplied between the optical element 2 and the substrate P even if the supply energy of 10 (liquid supply section 11) is small.
- the liquid flows between the optical element 2 and the substrate P regardless of whether the substrate P is scanned in the + X direction or the 1X direction. 1, and exposure can be performed with high resolution and a wide depth of focus.
- the measurement result of the flow meter 12 provided in the liquid supply mechanism 10 and the measurement result of the flow meter 27 provided in the liquid recovery mechanism 20 are always supplied to the control unit C and NT.
- the controller CONT measures the measurement result of the flow meter 12, that is, the amount of liquid supplied onto the substrate P by the liquid supply mechanism 10, and the measurement result of the flow meter 27, that is, the liquid collection mechanism 20.
- the amount of liquid collected from the substrate P is compared with the amount, and the valve 13 of the liquid supply mechanism 10 is controlled based on the comparison result.
- the controller CONT calculates the difference between the liquid supply amount on the substrate P (measurement result of the flow meter 12) and the liquid recovery amount from the substrate P (measurement result of the flow meter 27).
- the valve 13 is controlled based on the determination whether the obtained difference exceeds a preset allowable value (threshold).
- the control device CONT controls the liquid supply mechanism 10 and the liquid recovery mechanism 20 so that the liquid supply amount on the substrate P and the liquid recovery amount from the substrate P become almost the same. Since each is controlled, if the liquid supply operation by the liquid supply mechanism 10 and the liquid recovery operation by the liquid recovery mechanism 20 are normally performed, the difference obtained above is almost zero. It becomes. When the obtained difference is equal to or larger than the allowable value, that is, when the liquid recovery amount is extremely smaller than the liquid supply amount, the controller CONT generates an abnormality in the recovery operation of the liquid recovery mechanism 20 and sufficiently releases the liquid 1. Judge that it has not been collected.
- the controller CONT determines that an abnormality such as a failure has occurred in the vacuum system 25 of the liquid recovery mechanism 20, for example, and causes the liquid recovery mechanism 20 to not recover the liquid 1 normally.
- the valve 13 of the liquid supply mechanism 10 is operated to shut off the flow path of the supply pipe 15, and the supply of the liquid 1 to the substrate P by the liquid supply mechanism 10 is stopped.
- the control device CONT compares the amount of liquid supplied from the liquid supply mechanism 10 onto the substrate with the amount of liquid collected by the liquid recovery mechanism 20, and based on the comparison result.
- the liquid recovery mechanism 20 detects an abnormality in the recovery operation of the liquid recovery mechanism 20, and the supply of the liquid 1 becomes excessive.
- the control device CONT configures the exposing device EX to prevent the leakage due to the adhesion of the leaked or infiltrated liquid 1 when the abnormality of the recovery operation of the liquid recovery mechanism 20 is detected. Stop power supply to electrical equipment.
- the electric device include linear motors 47 and 48 for moving the substrate stage PST. Since these linear motors 47 and 48 are located at a position where the leaked liquid 1 easily adheres to and penetrates the outside of the substrate stage PST, the controller CONT stops supplying power to these linear motors 47 and 48. By doing so, it is possible to prevent electric leakage due to the adhesion of the liquid 1.
- the electric equipment includes, for example, a sensor (e.g., a laser) provided on the substrate stage PST and receiving the exposure light EL for the substrate stage PST.
- a sensor e.g., a laser
- various actuators such as a piezo element for adjusting the position of the substrate holder PH in the Z-axis direction and the tilt direction can be cited.
- the controller CONT when detecting an abnormality in the recovery operation of the liquid recovery mechanism 20, the controller CONT, for example, detects a linear motor, a piezo element used near 0 to 150 V, Stop power supply to electrical equipment (high-voltage equipment) such as photomultipliers (sensors) used near 0 V to prevent the occurrence of electrical leakage and reduce the effect on peripheral devices due to electrical leakage. Can be. Further, when detecting an abnormality of the liquid collecting mechanism 20 in the collecting operation, the controller CONT moves, for example, the substrate stage PST in a non-contact manner with respect to the guide surface 41 A of the substrate surface plate 41. Stop driving of air bearing 42.
- the air bearing 42 blows out gas (air) to the upper surface (guide surface) 41 A of the substrate surface plate 41-an outlet 42B, the lower surface (bearing surface) of the substrate stage PST and the guide.
- An intake port 42A for sucking gas between the surface 41A is provided. Although a certain gap is maintained between the lower surface of the substrate stage PST and the guide surface 41A, when the controller CONT detects an abnormality in the recovery operation of the liquid recovery mechanism 20, Stop the operation of the air bearing 42, especially the intake from the intake port 42A, to prevent the leaked liquid 1 from flowing into (penetrating into) the intake port 42A of the air bearing 42. .
- the controller CONT controls the separate member.
- the suction from the suction hole (suction port) for holding by suction may be stopped.
- the control device CONT also activates an alarm when an abnormality is detected in the recovery operation of the liquid recovery mechanism 20. Drive K.
- Alarm device K is used for warning light, alarm sound, display A warning is issued by using a light source or the like, whereby, for example, an operator can know that the liquid 1 has leaked or entered the exposure apparatus EX. Further, when detecting an abnormality in the recovery operation of the liquid recovery mechanism 20, the controller CONT increases the liquid recovery amount of the recovery device 60. Specifically, the driving amount (driving force) of the vacuum system 70 of the recovery device 60 is increased. Since the driving of the recovery device 60 (vacuum system 70) is a vibration source, it is preferable that the driving force of the recovery device 60 be reduced or stopped during the exposure processing.
- the controller CONT raises the driving force of the recovery device 60 to move the outside of the substrate stage PST (substrate holder PH). It is possible to prevent the leakage of the liquid 1 to a small extent (outside the recovery port 61) or to prevent the leakage from spreading. Further, while exposing a shot area near the center of the substrate P, the liquid 1 supplied from the liquid supply mechanism 10 is recovered by the liquid recovery mechanism 20. On the other hand, as shown in FIG.
- the liquid 1 that has flowed into the gap between the substrate P and the auxiliary plate 43 is recovered through the liquid recovery hole 64 along with the surrounding air through the flow path 63 and the conduit 68.
- the gas-liquid separator 71 separates the liquid 1 and the gas recovered from the recovery port 61.
- the gas separated by the gas-liquid separator 71 is dried in the dryer 72 and then flows into the vacuum system 70. This can prevent the inconvenience of the liquid component flowing into the vacuum system 70.
- the liquid separated by the gas-liquid separator 71 is recovered by the liquid recovery unit 73.
- the controller CONT compares the measurement results of the flow meter 12 of the liquid supply mechanism 10 and the flow meter 27 of the liquid recovery mechanism 20 even though the liquid 1 does not leak. Based on the result, it may be erroneously determined that an abnormality has occurred in the recovery operation of the liquid recovery mechanism 20.
- a flow meter for measuring the amount of the collected liquid is provided between the gas-liquid separator 71 and the liquid collecting part 73 of the collecting device 60, and the control device C 0 NT is provided with the collecting device 6
- the total liquid recovery amount is obtained, and the obtained total liquid recovery amount and the liquid supply mechanism 10 flow meter 12 Compare the measurement results.
- the controller CONT determines whether or not an abnormality has occurred in the liquid and recovery operation of the liquid recovery mechanism 20, and based on the determined result, the liquid supply mechanism 10. Can stop the liquid supply operation, stop the power supply, and stop the suction operation from the intake port.
- the control device CONT sends a large amount of the liquid 1 to the outside of the substrate P.
- the liquid supply mechanism 10 may be stopped to judge that the liquid 1 is flowing out and to prevent the liquid 1 from leaking out of the substrate stage PST (substrate holder PH).
- the liquid 1 flowing out of the substrate P may enter the gap between the substrate P and the auxiliary plate 43 and reach the back side of the substrate P. Then, there is a possibility that the liquid 1 that has entered the rear surface side of the substrate P flows into the suction holes (suction ports) 66 for holding the substrate P by suction.
- the suction holes 66 provided in the substrate holder PH for holding the substrate P by suction are connected to the vacuum system 74 via the pipes 67 and 69, and in the middle thereof. Dry the gas separated by the gas-liquid separator 75 and the gas-liquid separator 75 A dryer 76 is provided. Therefore, even if the liquid 1 flows into the suction hole 66, the liquid 1 flowing from the suction hole 66 is collected by the liquid recovery part 73, thereby preventing the inconvenience of the liquid component flowing into the vacuum system 74. Can be.
- the flow meter detects the intrusion of liquid from the suction hole 66, it is determined that an abnormal situation has occurred, and the liquid supply operation is stopped as described above, the power supply is stopped, At least one of stopping the intake from the intake port may be executed.
- the vacuum system 74 suction system
- the suction from the suction hole 66 is stopped. Is also good.
- the gas-liquid separator By separating the liquid and separating the gas separated by the gas-liquid separator, the gas is further dried by a dryer, so that the inconvenience of liquid components (wet gas, etc.) flowing into the vacuum system can be prevented, and the liquid is supplied to the vacuum system. The influence can be suppressed.
- the liquid is collected from the suction port together with the surrounding gas, but the amount of the collected liquid is accurately measured by separating the collected liquid and the gas by the gas-liquid separator. be able to.
- a failure (operation abnormality) of the vacuum system 25 has been described as an example of the recovery operation of the liquid recovery mechanism 20.
- An abnormal operation of the gas-liquid separator 22 is also included.
- the control device CONT stops the liquid supply operation of the liquid supply mechanism 10 and collects the liquid. By stopping the liquid recovery operation of the mechanism 20 (vacuum system 2.5), it is possible to prevent the liquid 1 from leaking and to prevent the vacuum system 25 from malfunctioning.
- the control device CONT operates the liquid supply mechanism 10 and the liquid recovery mechanism 20 so that the liquid supply amount on the substrate P and the liquid recovery amount on the substrate P are substantially the same. Each of which is controlled. Therefore, if the liquid supply operation by the liquid supply mechanism 10 and the liquid recovery operation by the liquid recovery mechanism 20 are normally performed, the difference obtained above is almost zero, and the allowable value is It is preset to a smaller value accordingly. On the other hand, for example, when the liquid 1 to be used has a high volatility, the liquid supply operation by the liquid supply mechanism 10 and the liquid recovery operation by the liquid recovery mechanism 20 are normally performed.
- the controller CONT sets the above-mentioned tolerance in advance according to the liquid 1 (volatile) used or the environment where the substrate P is placed, and compares the set tolerance with the difference obtained above.
- the valve 13 may be controlled based on the following equation.
- the abnormality of the flow state of the liquid 1 is detected by comparing the amount of liquid supplied by the liquid supply mechanism 10 with the amount of liquid recovered by the liquid recovery mechanism 20.
- each abnormality may be detected based only on the supply amount of the liquid supply mechanism 10 or only on the recovery by the liquid recovery mechanism 20. Further, not only the flow rate of the liquid, but also when a mechanical or electrical abnormality of the liquid supply mechanism 10 or the liquid recovery mechanism 20 is detected, the control device CONT controls the liquid supplied by the liquid supply mechanism 10. Measures such as stopping the supply operation, stopping the power supply, and stopping the intake operation from the intake port can be performed. In the present embodiment, since the recovery nozzle 21 also collects the liquid 1 and the surrounding gas, the liquid collected using the gas-liquid separator 22 is used to measure the liquid recovery amount more accurately. The gas is separated from the gas, and the amount of the separated liquid is measured by a flow meter 27.
- the liquid amount measured by the flow meter 27 may vary depending on the gas-liquid separation capacity of the gas-liquid separator 22. Therefore, the controller C ON T can set the above-mentioned allowable value according to the gas-liquid separator 22 (gas-liquid separation capacity) to be used.
- the liquid supply mechanism 10 stops the liquid supply operation, stops the power supply to the electric device, and although it has been described that all the suction operations from the intake port are stopped, a configuration in which at least one of the operations is executed may be employed.
- the amount of liquid collected by the flow meter 27 can be accurately measured.
- the liquid recovery mechanism 20 is configured to recover only the liquid 1 from the recovery nozzle 21, the gas and liquid are separated by using the gas-liquid separator 22. By measuring the pressure of the recovered liquid without separating the liquid and the gas with the separator 22, the amount of the recovered liquid can be obtained.
- the liquid supply operation by the liquid supply mechanism 10 is stopped, the power supply to the electric device is stopped, or Although the suction operation from the mouth is stopped, the substrate stage (movable member) that can hold and move the substrate P (movable member)
- the liquid At least one of the stop of the supply operation, the stop of the power supply, and the stop of the intake operation from the intake port may be executed.
- the abnormal positional relationship between the substrate stage PST and the projection optical system PL refers to a state in which the liquid 1 cannot be held under the projection optical system PL, and at least one of the Z-axis direction and the XY direction. Includes positional errors. That is, even if the supply operation of the liquid supply mechanism 10 and the recovery operation of the liquid recovery mechanism 20 are normal, for example, an abnormality occurs in the operation of the substrate stage PST and the substrate stage PST If the liquid immersion area AR 2 of the liquid 1 cannot be formed well between the projection optical system PL and the substrate P held by the substrate stage PST if the liquid crystal device is placed at a position shifted in the XY direction with respect to the position. Liquid 1 cannot be held under the projection optical system PL).
- the liquid 1 leaks to the outside of the substrate P or the outside of the substrate holder P H, or the movable mirror 45 of the substrate stage P ST (substrate holder P H) is flooded. Then, since the liquid recovery mechanism 20 cannot recover a predetermined amount of the liquid 1, the flow meter 27 of the liquid recovery mechanism 20 outputs a measurement result of a value smaller than the predetermined value to the controller C0NT.
- the control device C ON T can detect an abnormality in the position of the substrate stage PST where leakage of the liquid 1 or the like occurs, based on the measurement result of the flow meter 27. Then, when detecting the abnormality, the control device CONT stops the liquid supply operation, stops the power supply, and stops the suction operation from the intake port.
- the immersion area AR 2 is set to a distance between the projection optical system PL and the substrate P by a predetermined distance (0.1 mm to 1 mm) that can form the immersion area AR 2 by the surface tension of the liquid 1.
- a predetermined distance 0.1 mm to 1 mm
- the distance between the projection optical system PL and the substrate P on the substrate stage PST is large. Therefore, a situation may occur in which the liquid 1 cannot be held under the projection optical system PL.
- the liquid recovery mechanism 20 cannot recover a predetermined amount of the liquid 1, so the flow meter 27 of the liquid recovery mechanism 20 has a smaller value than the predetermined value.
- the measurement result of is output to the controller CONT.
- the control device C ON T can detect an abnormality in the position of the substrate stage P ST at which the leakage of the liquid 1 occurs, based on the measurement result of the flow meter 27. Then, when detecting the abnormality, the control device CONT'T executes a stop of the liquid supply operation, a stop of the power supply, a stop of the suction operation from the suction port, and the like.
- the XY direction position can be detected, and based on the position detection result, an abnormality in the positional relationship can be detected.
- the control device CONT compares the substrate stage position detection result by the interferometer 46 with a preset allowable value, and when the stage position detection result of the interferometer 46 exceeds the allowable value, the liquid 1 The supply operation may be stopped or the like. Further, the position of the substrate stage PST in the Z-axis direction is detected by the focus detection system 56, and the result of the stage position detection by the focus detection system 56 is compared with a preset allowable value.
- the control device CONT may execute a stop operation of the supply operation of the liquid 1 or the like.
- the control device CONT detects an abnormality in the positional relationship between the projection optical system PL and the substrate stage PST based on the detection result of the substrate stage position detection device including the interferometer 46 and the focus detection system 56.
- an abnormality is detected, it is possible to execute a stop of the liquid supply operation, a stop of the power supply to the electric device, a stop of the intake operation from the intake port, and the like.
- the control device C CNT may stop the liquid supply operation by the liquid supply mechanism 10.
- the error of the interferometer 46 means that the position of the substrate stage PST can be measured for some reason, such as a failure of the interferometer 46 itself or a foreign object placed on the optical path of the measurement light of the interferometer. Including lost status. If the interferometer 46 generates an error, the controller C O N T The position of the plate stage PST cannot be grasped, and at the same time, the position of the substrate stage PST cannot be controlled. In this case, an abnormality occurs in the positional relationship between the projection optical system PL and the substrate stage PS #, and the liquid 1 may leak or flow out. Therefore, when the interferometer 46 generates an error, the liquid supply by the liquid supply mechanism 10 is stopped to prevent the liquid 1 from leaking.
- the control device CONT controls the liquid supply by the liquid supply mechanism 10 when the focus detection 56 generates an error. Can be stopped.
- abnormalities in the positional relationship between the substrate stage PST (substrate holder PH) and the projection optical system PL in the Z-axis direction are not limited to the focus detection system 56, but also to non-optical detection systems such as capacitance sensors. It may be used.
- the positional relationship between the image plane of the projection optical system PL and the surface of the substrate stage PST (substrate P) can be managed using an interferometer.
- the use of an interferometer to manage the positional relationship with the surface is disclosed, for example, in US Pat. No. 6,020,966, and is permitted by the laws of the country designated or selected in this international application. To the extent possible, these disclosures are incorporated herein by reference. Further, in the above-described embodiment, the case where an abnormality occurs during the exposure operation has been described, but the same applies to the case where an abnormality occurs when the substrate P is not exposed.
- the supply of the liquid is stopped when an abnormality is detected during the supply of the liquid.
- the projection optical system PL and the base are used.
- the start of liquid supply may be stopped even when an abnormality such as a positional relationship with the plate stage PST is detected.
- the leakage of the liquid 1 to the outside of the substrate ⁇ or the substrate stage PST (substrate holder ⁇ ) is optically detected using a detector including an optical fiber, and the leakage of the liquid 1
- a detector including an optical fiber When the intrusion is detected, at least one of the stop of the liquid supply operation by the liquid supply mechanism 10, the stop of the power supply to the electric device, and the stop of the suction operation from the suction port is executed.
- the detection principle of the detector that detects the leakage of the liquid 1 will be described with reference to FIGS. 'In the present embodiment, an optical fiber is used as the detector.
- FIG. 6 is a schematic configuration diagram showing a general optical fiber.
- the optical fiber 80 ′ includes a core portion 81 for transmitting light, and a cladding portion 82 provided around the core portion 81 and having a smaller refractive index than the core portion 81.
- the light is confined and propagated in the core 81 having a higher refractive index than the cladding 82.
- FIG. 7 is a schematic configuration diagram illustrating an optical fiber 80 according to the present embodiment.
- an optical fiber 80 is an optical fiber (claddless fiber) having a core portion 81 for transmitting light and having no clad portion around the core portion 81.
- the core portion 81 of the optical fiber 80 has a refractive index nc higher than the refractive index na of the surrounding gas (air in the present embodiment) and lower than the refractive index nw of the liquid (pure water in the present embodiment) 1.
- na ⁇ nc ⁇ nw has a refractive index (na ⁇ nc ⁇ nw). Therefore, when the circumference of the optical fiber 80 is filled with air, the incident angle of light is 0. Is the total reflection condition s i n0. As long as it satisfies> na / nc, the light is confined and propagated in the core portion 81 having a higher refractive index nc than air.
- the light incident from the incident end of the optical fiber 80 is emitted from the exit end without attenuating the light amount.
- the liquid (pure water) 1 adheres to the surface of the optical fiber 80, the water adheres because nc ⁇ nw.
- the total reflection condition s in 0 at any incident angle. nw / nc cannot be satisfied, and total reflection does not occur at the interface between the liquid 1 and the optical fiber 80, so that light leaks outside from the liquid-attached portion of the optical fiber 80. Therefore, the amount of light incident from the entrance end of the optical fiber 80 decreases when exiting from the exit end.
- the optical fiber 80 is set at a predetermined position of the exposure apparatus EX; by measuring the light amount at the exit end of the optical fiber 80, the control device CONT is connected to the optical fiber 80. It is possible to detect whether or not liquid 1 has adhered, that is, whether or not liquid 1 has leaked. Since the refractive index of air is about 1 and the refractive index of water is about 1.4 to 1.6, the core 81 is made of a material having a refractive index of about 1.2 (quartz, specific composition, for example). Is preferred. Further, the amount of the liquid 1 adhering to the optical fiber 80 can be obtained from the amount of attenuation of the light emitted from the exit end of the optical fiber 80.
- the amount of light attenuation depends on the area of the portion where the liquid 1 adheres to the optical fiber, and if a small amount of liquid 1 adheres around the optical fiber 80, the amount of light The attenuation is small, and when a large amount of liquid 1 adheres, the attenuation is large. Therefore, it is considered that the area of the portion where the liquid 1 adheres depends on the leakage amount of the liquid, so that the leakage amount of the liquid 1 can be obtained by measuring the light amount at the exit end of the optical fiber 80. . Furthermore, by comparing the measured value of the amount of light at the optical fiber emission end with a plurality of preset thresholds (reference values), a specific signal is emitted when each threshold is exceeded.
- FIG. 8 is a side view showing a state where the optical fiber 80 of the above detector is arranged around the substrate stage PST (substrate holder PH).
- FIG. 9 is a plan view. As shown in FIGS. 8 and 9, the optical fiber 80 is arranged so as to wind around the substrate stage PST (substrate holder PH).
- a light projecting unit 83 capable of making light incident on the optical fiber 80 is connected to the incident end of the optical fiber 80, and the optical fiber 80 is connected to the emitting end of the optical fiber 80. Light that propagates and exits from the exit end can be received
- Light receiving section 84 is connected.
- the control device C 0 NT determines the input end of the optical fiber 80 based on the amount of light incident on the optical fiber 80 from the light emitting section 83 and the amount of light received by the light receiving section 84.
- the light attenuating rate at the exit end for the part is determined, and based on the result, whether or not the liquid 1 has adhered to the optical fiber 80, that is, the liquid 1 leaks outside the substrate stage PST (substrate holder PH) Determine if you have done so.
- the controller CONT determines that the liquid 1 has leaked, the controller CONT stops the liquid supply operation by the liquid supply mechanism 10, stops the power supply to the electric device, and stops the intake operation from the intake port. I do.
- the optical fiber 80 may be placed on the upper surface of the substrate stage PST (substrate holder PH), especially around the collection port 61, or to check the movable mirror 45 for immersion (immersion liquid).
- the moving mirror 45 may be arranged at or around the moving mirror.
- Figure 10 shows the optical fiber 80 around the air bearing 42 provided on the lower surface of the substrate stage PST and around the substrate surface plate (base member) 41 that supports the substrate stage PST movably. It is a figure showing the example of arrangement. Since the optical fiber 80 can be bent arbitrarily, it should be wound around any position where the liquid 1 such as the substrate stage PST (substrate holder PH), the air bearing 42, and the substrate surface plate 41 can easily leak. And can be freely arranged and arranged in any form.
- the optical fiber 80 by attaching the optical fiber 80 around the air bearing 42, it is possible to detect whether or not the liquid 1 has adhered (leaked) in the vicinity of the air bearing 42. The inconvenience of the liquid 1 flowing into the mouth 42A can be prevented.
- the optical fiber 80 described above if the distance from the input end to the output end is long, it may be difficult to specify the position where the liquid 1 adheres to the optical fiber 80, that is, the leak position of the liquid 1. is there. Therefore, as shown in FIG. 11, by arranging a plurality of optical fibers 80 two-dimensionally in a matrix, the leakage position of the liquid 1 can be specified.
- the detector 90 is in the first direction (Y-axis).
- first optical fibers 8 OA provided in parallel in a second direction (X-axis direction) orthogonal to the first direction, and a second direction as a longitudinal direction.
- second optical fibers 80B provided side by side in a plurality.
- the plurality of first and second optical fibers 80A and 80B are arranged in a matrix (network).
- the input ends of the plurality of first optical fibers 8OA are aggregated, and the aggregated portion and the emission end of the aggregate fiber 85A are connected.
- the incident end of the collective fiber 85 A is connected to the light emitting section 83 A.
- each of the plurality of first optical fibers 80A is connected to a light receiving section 84A composed of, for example, a one-dimensional CCD line sensor or the like.
- the incident ends of the plurality of second optical fibers 80B are aggregated, and the aggregated portion and the exit end of the aggregate fiber 85B are connected.
- the incident end of the collective fiber 85B is connected to the light emitting section 83B.
- the emission end of each of the plurality of second optical fibers 80B is connected to a light receiving section 84B composed of, for example, a one-dimensional CCD line sensor or the like.
- the light emitted from the light projecting unit 83 A propagates through the collective fiber 85 A, and is then branched into each of the plurality of first optical fibers 80 A.
- the light incident from the incident end of each of the first optical fibers 80A propagates through the first optical fiber 80A, is emitted from the emission end, and is received by the light receiving unit 84A.
- the light receiving section 84A detects each of the amounts of light emitted from the emission ends of the plurality of first optical fibers 80A.
- the first optical fiber 80 The light intensity at the emission end of AL decreases.
- the light receiving result of the light receiving section 84A is output to the control device C0NT.
- the light emitted from the light projecting unit 83B propagates through the collective fiber 85B, and is branched into each of the plurality of second optical fibers 80B.
- the light incident from the incident end of each of the second optical fibers 80B propagates through the second optical fiber 80B, exits from the exit end, and is received by the light receiving section 84B.
- the light receiving section 84B detects each of the light amounts of the light emitted from the emission ends of the plurality of second optical fibers 80B.
- the control device CONT determines whether the leak position of liquid 1 (the position where the leaked liquid 1 adheres to the detector 90) is the first optical fiber. It can be specified that it is near the intersection of the 8 OAL and the second optical fiber 80 BL. Fig.
- FIG. 12 shows a linear motor 47 (stator 47A) in which a detector 90 having optical fibers 80A and 80B arranged in a matrix is an electromagnetic drive source for driving the substrate stage PST. It is a figure showing the example arranged in.
- the position of the liquid 1 leaking outside the substrate stage PST and adhering to the linear motor 47 can be specified.
- the position of the leaked liquid 1 for example, the work of removing the leaked liquid 1 can be performed efficiently.
- water should be removed satisfactorily by performing the removal operation (wiping operation) using anhydrous alcohol.
- the removal operation can be performed smoothly.
- the position of the liquid 1 attached to the surface of the optical fiber 80 can be specified. .
- the pulse light L1 incident from the incident end of the optical fiber 80 is reflected at the position where the liquid 1 is adhered, and the reflected light L2 is returned to the incident end.
- an optical element such as a polarizing beam splitter is provided on the incident side, and the reflected light is guided to the light receiver by the optical element and detected.
- the leak of the liquid 1 is optically detected using a detector including a prism (optical element), and when the leak of the liquid 1 is detected, the liquid supply operation by the liquid supply mechanism 10 is performed. Perform at least one of the following: stopping, stopping power supply to electrical equipment, and stopping suction operation from the intake port.
- a prism is used as a detector.
- FIG. 14 is a diagram showing a schematic configuration of a detector 100 using a prism.
- a detector 100 includes a prism 101 and a light emitting unit 1 attached to the first surface 101 A of the prism 101 and projecting light to the prism 101.
- the prism 101 has a higher refractive index than the surrounding gas (air in the present embodiment) and lower than the liquid (pure water in the present embodiment) 1.
- the refractive index of the prism is selected.
- FIG. 15 is a diagram showing a state in which the liquid 1 has adhered to the third surface 101 C of the prism 101 of the detector 100.
- the light projected from the light emitting unit 102 to the third surface 101 C is not totally reflected by the third surface 101 C due to the presence of the liquid 1, but is partially (or entirely). Part) leaks to the outside from the liquid adhering portion of the prism 101.
- the light amount of the light component reaching the second surface 101B out of the light emitted from the light emitting unit 102 is attenuated, so that the light receiving unit 103 sets the prism 10 based on the received light amount (optical information). It can be detected whether or not the liquid 1 has adhered to the third surface 101C of 1. Therefore, the detection device 00 equipped with the prism 101 is installed at a predetermined position of the exposure apparatus EX, so that the control unit CONT determines the prism 101 based on the light receiving result of the light receiving unit 103. It is possible to detect whether or not liquid 1 has adhered, that is, whether or not liquid 1 has leaked. FIG.
- FIG. 16 is a plan view showing an example in which the detector 100 having the prism 101 is arranged around the substrate stage PST.
- a plurality of detectors 110 are mounted at predetermined intervals around a substrate stage PST (substrate holder PH) with the third surface 101 C of the prism 101 facing upward.
- the control unit SCONT calculates the prism 101 based on the amount of light incident on the prism 101 from the light emitting unit 102 of each detector 100 and the amount of light received by the light receiving unit 103.
- the decay rate of the emitted light amount with respect to the incident light amount is calculated, and based on the obtained result, whether the liquid 1 has adhered to the prism 101, that is, the liquid 1 leaks outside the substrate stage PST (substrate holder PH) Determine if you have done it.
- the control unit CONT stops the liquid supply operation by the liquid supply mechanism 10, stops the power supply to the electric device, and stops the suction operation from the intake port.
- the controller CONT easily determines the leak position of the liquid 1 based on the detection results of the plurality of detectors 100 and the mounting position information of the detectors 100. Can be identified.
- FIG. 4 is a schematic diagram showing an example in which a plurality of containers 100 are mounted side by side.
- the wall of the tank 110 is transparent, and the detector 100 is mounted so that the third surface 101 C of the prism 101 is in contact with the wall of the tank 110.
- the light-receiving signal of the detector 100 (light-receiving unit 103) that detected liquid 1 in the tank 110 is the detector that does not detect liquid 1.
- the controller CONT determines the detection result (light receiving result) of each of the plurality of detectors 100 and the detection result of each of the plurality of detectors 100.
- the liquid level (water level) of the liquid 1 in the tank 110 can be obtained based on the mounting position information with respect to the tank 110, and thus the liquid amount in the tank 110 can be obtained.
- FIG. 18 is a schematic configuration diagram showing an example in which a tank 110 having a detector 100 constituting a water level gauge is applied to a part of a liquid recovery mechanism 20.
- the liquid recovery mechanism 20 shown in FIG. 18 is provided in the middle of the recovery nozzle 21, a vacuum system 25 connected to the recovery nozzle 21 via the recovery pipe 24, and the recovery pipe 24.
- a gas-liquid separator 22 and a dryer 23 are provided. Then, the liquid 1 separated by the gas-liquid separator 22 is stored in a tank 110 provided with a detector 100 via a second recovery pipe 26. That is, the present embodiment has a configuration in which a tank 110 is provided instead of the flow meter 27 of the liquid recovery mechanism 20 described with reference to FIG.
- the detection result of the detector 100 can be completely output to the controller CONT, and the controller CONT determines the amount of liquid recovered through the recovery nozzle 21 based on the detection result of the detector 100. Then, the control device CONT detects an abnormality in the recovery operation of the liquid recovery mechanism 20 by comparing the amount of liquid recovered from the recovery nozzle 21 with the amount of liquid supplied from the liquid supply mechanism 10. be able to.
- a liquid recovery unit 28 is connected to the tank 110 via a pipe 28A, and a valve 28B is provided in the pipe 28A. The control device CONT activates the valve 28B to open the flow path 28A when the tank 110 is filled with a predetermined amount or more (or periodically). The liquid 1 is collected in the liquid collecting section 28. Further, in the embodiment shown in FIG.
- the detector 100 is attached to each of the supply pipe 15 and the recovery pipe 24.
- each of the supply pipe 15 and the recovery pipe 24 is formed of a transparent material, and the detector 1100 is placed such that the detection surface 100 c of the detector 100 is in close contact with the outer surface of the pipe. 0 0 is attached.
- the control unit CONT detects whether or not the liquid 1 is flowing through the supply pipe 15 based on the light reception result of the light receiving unit 103 of the detector 100 attached to the supply pipe 15. Can be. In other words, the value of the light receiving signal of the light receiving portion 103 is smaller when the liquid 1 is flowing than when the liquid 1 is not flowing through the supply pipe 15.
- the controller CONT determines whether or not the liquid 1 is flowing through the collection pipe 24 based on the light reception result of the light receiving section 103 of the detector 100 attached to the collection pipe 24. That is, it is possible to detect whether or not the operation of the liquid recovery mechanism 20 is performed normally.
- the detector 100 can also be used as a liquid / presence sensor that optically detects whether the liquid 1 is flowing through the supply pipe or the recovery pipe.
- the projection optical system PL can be used by using the detector 100. It is also possible to detect whether or not the liquid 1 is filled between the substrate 1 and the substrate P. In the above embodiment, the leakage of the liquid 1 and the presence or absence of the liquid 1 are optically detected using the optical fiber 80 prism 101, but electrically detected using a capacitance sensor or the like. You may make it detect. If liquid 1 is water, it consists of two wires separated by a fixed distance, and a leak sensor that detects the leak of liquid 1 based on the presence or absence of continuity between the two wires causes the leak of liquid 1 and the discharge of liquid 1.
- the presence or absence can also be detected electrically.
- the water leakage sensor having the above configuration can be used.
- the presence or absence of the liquid 1 cannot be detected by the water leakage sensor having the above configuration because the ultrapure water has no conductivity.
- the coating of the two separated electric wires contains an electrolyte beforehand, the conductivity will be obtained when the ultrapure water infiltrates, so that the liquid 1 Can be detected.
- optical fiber 80 it is possible to lay an optical fiber 80 around the linear motor and arrange a detector 100 having a prism 101 around the substrate stage PST (substrate holder PH).
- Optical fibers and prisms may not be installed at all of the positions described above, and may be placed inside the substrate stage PST or an actuator such as a photoelectric detector or a piezo element.
- the optical fiber 80 can be arranged so as to be wound around the substrate stage PST and the substrate platen 41. As shown in the side view of (b), the first optical fiber 80 C is provided around the substrate stage PST, and the second optical fiber 80 D is provided around the substrate surface plate 41. It is of course possible to provide them. Further, the optical fiber 80 (80 E) may be arranged inside the recovery port 61 provided on the substrate stage PST. As in the above-described embodiment, in FIG. 19, the substrate stage PST includes an auxiliary plate 43 formed so as to surround the periphery of the substrate P held by the substrate holder PH, and a collection port provided outside the auxiliary plate 43.
- the auxiliary plate 43 is provided around the substrate P held by the substrate holder PH, and has a flat surface (flat portion) 43A substantially flush with the surface of the substrate P.
- the flat surface 43 A is provided in an annular shape so as to surround the periphery of the substrate P.
- a recovery port 61 is provided outside the auxiliary plate 43 (flat surface 43A).
- Collection port 6 1 is connected to auxiliary plate 4 3 (substrate An annular groove formed so as to surround P).
- no liquid absorbing member (62) is disposed inside the recovery port 61.
- the optical fiber 80E is arranged over the entire circumference of the recovery port 61 formed in an annular shape.
- the controller CONT takes appropriate measures such as stopping the liquid supply operation of the liquid supply mechanism 10 using the valve 13 or the like. This can prevent the liquid 1 from diffusing and leaking from the substrate stage PST.
- the liquid absorbing member (62) may be disposed in the recovery port 61. Also, as shown in Fig. 19.
- the control device C 0 NT may control the operation of the exposure device EX according to the detection results of the plurality of optical fibers 80.
- the control device CONT stops the liquid supply by the liquid supply mechanism 10 and the power supply to the electric device in accordance with the position of the optical fiber 80 that has detected the liquid 1 among the plurality of optical fibers 80. At least one of the operations described above.
- the controller CONT stops the liquid supply operation of the liquid supply mechanism 10 when the first optical fiber 80C provided on the substrate stage PST detects the presence of the liquid 1,
- the second optical fiber 80D provided on the substrate surface plate 41 detects the presence of the liquid 1, the power supply to a predetermined electric device is stopped.
- the predetermined electric device includes linear motors 47 and 48 for driving the substrate stage PST, an anti-vibration unit 9 for supporting the substrate surface plate 41 in an anti-vibration manner, and the like.
- the first optical fiber 80C provided on the substrate stage PST detects the presence of the liquid 1
- the second optical fiber 80D provided on the substrate surface plate 41 detects the presence of the liquid 1.
- the control unit CONT determines that the leaked liquid 1 does not reach the linear motors 47 and 48 for driving the substrate stage PST and the vibration isolation unit 9. That is, the controller C 0 NT determines that the diffusion range of the leaked liquid 1 is a relatively narrow range. In this case, the control unit CONT stops the liquid supply operation of the liquid supply mechanism 10, but continues to supply power to the linear motors 47 and 48 and the vibration isolation unit 9. On the other hand, when the second optical fiber 80D provided on the substrate surface plate 41 detects the presence of the liquid 1, the controller CONT sends the liquid leaking to the linear motors 47 and 48 and the vibration isolating unit 9. Judge that 1 is reached. In other words, the controller CONT determines that the diffusion range of the leaked liquid 1 is relatively wide.
- the control device CONT stops the liquid supply operation of the liquid supply mechanism 10 and stops the power supply to at least one of the linear motors 47 and 48 and the vibration isolation unit 9.
- the control unit CONT stops the power supply to the linear motors 47 and 48 or the anti-vibration unit 9, but performs the exposure. It is preferable not to stop the power supply to the entire device EX. This is because if power supply to the entire exposure apparatus EX is stopped, it takes a long time for the restoring work and stabilization thereafter.
- the operation of the exposure apparatus EX is controlled in accordance with the detection results of the first optical fiber 80C and the second optical fiber 80D provided at different positions from each other.
- Appropriate measures can be taken according to the diffusion range of 1. Therefore, it is possible to reduce the time required for the return work after the leakage of the liquid 1, and to prevent a decrease in the operation rate of the exposure apparatus EX. Then, when the first optical fiber 80C provided on the substrate stage PS detects the presence of the liquid 1, the controller C0NT stops the liquid supply by the liquid supply mechanism 10, and the electric power to the electric device is stopped. By continuing the supply, the time required for restoration work and stabilization can be minimized. On the other hand, when the second optical fiber 80D provided on the substrate surface plate 41 detects the presence of the liquid 1, the control unit CONT controls the linear motors 47, 48 for driving the substrate stage PST and the vibration isolator. Stop supplying power to unit 9.
- control device CONT may control the operation of the exposure device EX in accordance with the amount of the liquid 1 detected by the optical fiber 80.
- the control device 'C 0 NT controls at least one of the stop of the liquid supply operation of the liquid supply mechanism 10 and the stop of the power supply to the electric device in accordance with the amount of the liquid 1 detected by the optical fiber 80. Select the action. Specifically, the control device CONT detects that at least one of the first optical fiber 80C and the second optical fiber 80D detects the liquid 1 in an amount equal to or more than a predetermined first reference value.
- the linear motors 47 and 48 that drive the substrate stage PST when the amount of liquid 1 that is equal to or greater than the second reference value is detected, and the substrate surface plate 4 Stop the power supply to the electrical equipment such as the anti-vibration unit 9 that supports the anti-vibration 1.
- the second reference value is larger than the first reference value.
- the controller CONT detects that the amount of liquid 1 detected in at least one of the first optical fiber 80C and the second optical fiber 80D is greater than the first reference value and less than the second reference value. When it is determined that the amount of the liquid 1 that has leaked is determined to be relatively small. In this case, the control device COT stops the liquid supply operation of the liquid supply mechanism 10, but continues to supply power to the linear motors 47, 48 and the vibration isolating unit 9. On the other hand, when the controller CONT determines that the amount of the liquid 1 detected by at least one of the first optical fiber 80C and the second optical fiber 80D is not less than the second reference value. However, it is determined that the amount of the leaked liquid 1 is large.
- the control device C 0 NT stops the liquid supply operation of the liquid supply mechanism 10 and stops the power supply to at least one of the linear motors 47, 48 and the vibration proof unit 9.
- the control device C0NT supplies the electric power to the linear motors 47, 48 or the vibration isolating unit 9.
- the power supply is stopped, but the power supply to the entire exposure system EX is not stopped. preferable. If the power supply to the entire exposure system EX is stopped, it takes a long time for the restoring work and stabilization. As described above, it is possible to control the operation of the exposure apparatus EX according to the amount of the liquid 1 detected by the optical fiber 80.
- one optical fiber 80 is arranged so as to surround the substrate stage PST and the substrate surface plate 41.
- the substrate stage PST and the substrate surface plate are constituted by a plurality of optical fibers. You can also surround the circumference of 4 1.
- one optical fiber 80 can be placed on each of the four sides of the substrate surface plate 41, and the optical fiber 80 can be used to surround the substrate surface 41 with a total of four optical fibers. .
- the leak location of the liquid 1 can be easily specified by checking which optical fiber is reacting. Further, as described above, when the positional relationship between the projection optical system PL and the substrate stage PST becomes abnormal, the liquid 1 cannot be held under the projection optical system PL, and the liquid 1 leaks. . Therefore, in order to prevent the liquid 1 from leaking, the movement range of the substrate stage PST may be limited. This will be described with reference to FIG. In FIG. 20, the substrate stage PST has a flat area including the surface of the substrate P (or dummy substrate DP) held by the substrate holder PH and the flat surface 43 A of the auxiliary plate 43 flush with the surface of the substrate P. Has a first area LA 1.
- the position facing the first area LA 1 includes the image-side tip surface (lower surface) 2 a of the projection optical system PL and a part of the lower surface of the plate member 2 P flush with the lower surface 2 a.
- a second area LA2, which is a flat area, is provided.
- liquid 1 is on the substrate stage PST
- the liquid immersion area AR2 is formed by being held between a first flat surface and a second flat surface including the front end surface 2a of the projection optical system PL and facing the first flat surface. Therefore, the first area LA 1 on the substrate stage PST and the second area LA 2 facing the first area LA 1 and including the tip end surface 2 a of the projection optical system PL are liquid holding areas.
- the liquid 1 is held between the part of the first area LA1 and the second area LA2 to form the liquid immersion area AR2.
- the first area LA1 and the second area LA2 do not necessarily have to be flat surfaces, and may have curved surfaces or irregularities as long as the liquid 1 can be retained.
- the liquid 1 in the liquid immersion area AR 2 is supplied to the supply nozzle 14 having a liquid supply port 14 K arranged around the optical element 2 at the distal end of the projection optical system PL and a liquid recovery port. It is also in contact with a part of the recovery nozzle 21 having 21 K.
- the second area LA 2 that can hold the liquid 1 is configured to include the liquid contact surfaces of the supply nozzle 14 and the recovery nozzles 21.
- the control device CONT limits the movement of the substrate stage PST according to the positional relationship between the first area LA1 and the second area LA2. Specifically, as shown in FIG. 20 (a), when the liquid 1 is held between the first area LA1 and the second area LA2, the second liquid as shown in FIG. The liquid 1 can be held up to the positional relationship between the first area LA 1 and the second area LA 2. However, when the substrate stage PST moves in the + X direction from the positional relationship shown in FIG. 20 (b), a part of the liquid immersion area AR2 comes out of the first area LA1, A situation occurs in which liquid 1 cannot be retained between one area A 1 and the second area LA 2.
- control device CONT determines that an abnormality has occurred in the positional relationship between first area LA1 and second area LA2, and limits the movement of substrate stage PST. Specifically, the control device CONT stops the movement of the substrate stage PST. Thereby, inconvenience such as outflow of the liquid 1 can be prevented.
- the control device CONT can determine whether or not an abnormality has occurred in the positional relationship between the first area LA1 and the second area LA2 based on the measurement result of the interferometer 46.
- the control device CONT detects the position of the substrate stage PST in the XY direction by the interferometer 46, and based on the position detection result, based on the position information of the first region LA1 with respect to the second region LA2, that is, the first region LA
- the positional relationship between 1 and the second area LA 2 is obtained.
- Information about the size of each of the first area LA1 and the second area LA2 is stored in the control device CONT in advance.
- information on the size of the liquid immersion area AR2 formed between the first area LA1 and the second area LA2 is also obtained in advance by, for example, an experimental simulation, and is transmitted to the controller CONT. It is remembered.
- an abnormal value relating to the positional relationship between the first area LA1 and the second area LA2 is previously obtained in the control device CONT, and is stored in the control device CONT.
- the abnormal value is a value (relative distance) having a positional relationship in which the liquid 1 cannot be held between the first area LA 1 and the second area LA 2, and is relative to the second area LA 2. Therefore, when the first area LA1 exceeds the abnormal value, the liquid 1 cannot be held between the first area LA1 and the second area LA2.
- the controller CONT restricts the movement of the substrate stage PS when the position of the first area LA1 with respect to the second area LA2 exceeds the abnormal value based on the measurement result of the interferometer 46 ( Stop.
- the control device CONT is configured to stop moving the substrate stage PST when the position of the first area LA1 with respect to the second area LA2 exceeds the abnormal value.
- the moving direction of the substrate stage PST may be changed. More specifically, in FIG. 20, when the substrate stage PST moves in the + X direction and the second area LA 2 has an abnormal positional relationship with the first area LA 1, the control device CONT Then, the substrate stage PST is moved, for example, in the X direction. This can also prevent inconvenience such as outflow of the liquid 1.
- the controller CONT operates when an abnormality occurs in the positional relationship between the first area LA1 and the second area LA2, and the position of the first area LA1 with respect to the second area LA2 exceeds the abnormal value.
- the operation of the liquid supply mechanism (10) may be restricted. Specifically, when an abnormality occurs in the positional relationship between the first area LA1 and the second area LA2, the control device CONT stops the liquid supply operation by the liquid supply mechanism (10). In this way, inconveniences such as outflow of the liquid 1 can be prevented.
- the controller CONT supplies the liquid supply amount (liquid supply amount per unit time) by the liquid supply mechanism (10). To reduce.
- the control unit CONT operates the linear motor (47, 48) or the vibration isolator.
- the power supply to (9) may be stopped or the intake from the intake port (42A) may be stopped.
- the liquid supply by the liquid supply mechanism (10) is stopped, and the liquid 1 on the substrate Pi (substrate stage PST) is recovered by the liquid recovery mechanism (20). Thereafter, the liquid 1 is not retained between the first area LA1 and the second area LA2.
- the control unit CONT releases the restriction on the movement of the substrate stage PST. That is, while the liquid supply mechanism (10) supplies the liquid 1, the controller CONT moves the movement range of the substrate stage PST between the first area LA1 and the second area LA2. Liquid supply mechanism, limited to the first range that can hold liquid 1 between
- the range is limited to a second range wider than the first range. That is, when holding the liquid 1 between the projection optical system PL and the substrate stage PST (substrate P), the control unit CONT limits the movement range of the substrate stage PST to the first range. When the liquid 1 is not held between the projection optical system PL and the substrate stage PST (substrate P), the movement of the substrate stage PST within the second range wider than the first range is allowed. . This makes it possible, for example, to keep the liquid 1 between the projection optical system PL and the substrate stage PST (substrate P) satisfactorily, for example, during exposure of the substrate P.
- FIG. 21 is a view showing another embodiment of the present invention.
- FIG. 21 (a) is a side view
- FIG. 21 (b) is a plan view of the substrate stage as viewed from above.
- a nozzle member 18 having a liquid supply port 14K and a liquid recovery port 21K is provided around the optical element 2 of the projection optical system PL.
- the nozzle member 18 is an annular member provided so as to surround the side surface of the optical element 2 above the substrate P (substrate stage PST).
- a gap is provided between the nozzle member 18 and the optical element 2, and the nozzle member 18 is supported by a predetermined support mechanism so as to be isolated from the vibration of the optical element 2.
- the nozzle member 1.8 is provided above the substrate P (substrate stage PST), and has a liquid supply port 14K arranged so as to face the surface of the substrate P.
- the nozzle member 18 has two liquid supply ports 14K.
- the liquid supply port 14 K is provided on the lower surface 18 a of the nozzle member 18.
- the nozzle member 18 is provided above the substrate P (substrate stage PST), and has a liquid recovery port 21K arranged so as to face the surface of the substrate P.
- the nozzle member 18 has two liquid recovery ports 21K.
- the liquid recovery port 21K is provided on the lower surface 18a of the nozzle member 18.
- the liquid supply ports 14 K and 14 ⁇ are provided at respective positions on both sides in the X-axis direction across the projection area AR 1 of the projection optical system PL, and the liquid recovery ports 21 K and 21 ⁇ are The liquid supply ports 14 K and 14 K are provided outside the projection area AR 1 of the shadow optical system PL.
- the projection area AR1 of the projection optical system PL in the present embodiment is set to have a rectangular shape in plan view with the Y-axis direction as the long direction and the X-axis direction as the short direction.
- Lower surface of nozzle member 18 (surface facing substrate P side) 18 a is a flat surface, lower surface of optical element 2 (liquid contact surface) 2 a is also flat surface, and lower surface of nozzle member 18 18 a and the lower surface 2 a of the optical element 2 are almost flush. Thereby, the liquid immersion area AR2 can be satisfactorily formed in a wide range.
- the second area LA 2 that can hold the liquid 1 is an area of the lower surface 2 a of the optical element 2 and the Byone surface 18 a of the nozzle member 18 that is inside the recovery port 21 K.
- a recess 55 is provided on the substrate stage PST, and the substrate holder PH is arranged in the recess 55.
- the upper surface 57 of the substrate stage PST other than the concave portion 55 has a flat surface (flat portion) which is substantially the same height (flat) as the surface of the substrate P held by the substrate holder PH. Has become.
- the first area LA 1 capable of holding the liquid 1 is an area including the surface of the substrate P and the upper surface 57.
- moving mirrors 45 are arranged on two mutually perpendicular edges of a substrate stage PST having a rectangular shape in plan view.
- a reference member 300 is arranged at a predetermined position outside the substrate P.
- the reference member 300 is provided with a reference mark PFM detected by a substrate alignment system (not shown) and a reference mark MFM detected by a mask alignment system in a predetermined positional relationship.
- a substrate alignment system for example, as disclosed in Japanese Patent Application Laid-Open No. 4-65603, the substrate stage PST is stopped and white light or the like from a halogen lamp is placed on the mark.
- An FIA (Field Image Alignment) system is adopted, in which illumination light is applied, the obtained mark image is picked up by an image pickup device within a predetermined field of view, and the position of the mark is measured by image processing. Have been.
- FIA Field Image Alignment
- the mark is irradiated with light, and the image of the mark captured by a CCD camera or the like is taken.
- a VRA (Visual Reticle Alignment) method that detects mark positions by image processing data is used.
- the upper surface 301 A of the reference member 300 is almost flat, and is set at substantially the same height (level) as the surface of the substrate P held on the substrate stage PST and the upper surface 57 of the substrate stage PST. Have been killed.
- the upper surface 301A of the reference member 300 can also serve as a reference surface of the focus detection system 56.
- the substrate alignment system also detects an alignment mark AM formed on the substrate P. As shown in FIG.
- a plurality of shot areas S1 to S24 are formed on the substrate P, and the alignment mark AM is formed in the plurality of shot areas S1 to S24.
- a plurality is provided on the substrate P correspondingly.
- an illuminance unevenness sensor 40 as disclosed in, for example, Japanese Patent Application Laid-Open No. 57-117238 is used as a measurement sensor. 0 is arranged.
- the illuminance non-uniformity sensor 400 has a top plate 401 in a plan view.
- the upper surface 401A of the upper plate 401 is almost flat, and is almost the same as the upper surface 57 of the substrate stage ⁇ , the surface of the substrate P held on the ST, and the substrate stages ⁇ , S, ⁇ . It is provided at the same height.
- a pinhole portion 470 through which light can pass is provided on the upper surface 401 of the upper plate 401.
- portions other than the pinhole portion 470 are covered with a light-shielding material such as chrome.
- a spatial image measurement sensor such as that disclosed in Japanese Patent Application Laid-Open No. 2002-14005 is used as a measurement sensor. 500 is provided.
- the aerial image measurement sensor 500 includes an upper plate 501 having a rectangular shape in a plan view.
- the upper surface 501 A of the upper plate 501 is a substantially flat surface, and is approximately the same height as the surface of the substrate P held by the substrate stage PST and the upper surface 57 of the substrate stage PST. It is provided in.
- On the upper surface 501A of the upper plate 501 there is provided a slit section 570 through which light can pass. Of the upper surface 501A, portions other than the slit portion 570 are covered with a light-shielding material such as chrome.
- an irradiation amount sensor (illuminance sensor) 600 as disclosed in, for example, Japanese Patent Application Laid-Open No.
- H11-16816 is also provided.
- the upper surface of the upper plate 600 is held at the substrate stage PST It is provided at substantially the same height (level) as the surface of the substrate P and the upper surface 57 of the substrate stage PST.
- a gutter member 89 is provided on a side surface of the substrate stage PS # so as to surround the substrate stage PS #.
- the gutter member 89 is capable of collecting (holding) the liquid 1 leaking from above the substrate ⁇ and the substrate stage PS ⁇ , and is provided outside the upper surface (flat surface) 57 of the substrate stage PST.
- An optical fiber 80 that can detect the presence or absence of the liquid 1 is disposed inside the gutter member 89.
- the controller CONT When the optical fiber 80 of the gutter member 89 detects the presence of the liquid 1, the controller CONT performs an appropriate measure such as stopping the liquid supply operation of the liquid supply mechanism (10) as in the above-described embodiment. Apply.
- the liquid immersion area AR 2 is formed on the substrate ⁇ ⁇ when the substrate ⁇ ⁇ is exposed, but also when a reference mark MFM of the reference member 300 is measured, or when the sensor
- the liquid immersion area AR2 is formed on each of the upper plates 30 #, 401, 501, and 601. Then, measurement processing via the liquid 1 is performed.
- the second area LA2 such as the area including the upper surface 301A of the reference member 300 in the first area LA1
- the liquid 1 is filled between a part of the first area LA 1 and the second area LA 2.
- the area including the upper surface 401A of the upper plate 401 of the first area LA1 and the second area LA2 face each other, and the first area Liquid 1 is filled between a part of LA 1 and the second area LA 2.
- the region including the upper surfaces 501A and 601A of the upper plates 501 and 601 of the first region LA1 and the second region LA2 are opposed to each other, and liquid 1 is filled between a part of the first area LA 1 and the second area LA 2.
- the control unit CONT supplies the substrate while the liquid supply mechanism (10) supplies the liquid 1 to form the immersion area AR2 on the substrate stage PST (on the first area LA1).
- the movement range of the stage PST is limited to a first range SR 1 shown in FIG. 21 (b). In FIG.
- the symbol LA 2a is the position where the second area LA 2 is located on the + Y side and the _X side of the first area LA 1 within the range in which the liquid 1 can be held. Is shown.
- the optical axis AX of the projection optical system PL (second area LA2) moves with respect to the substrate stage PST (first area LA1). It will be described as an example.
- the symbol LA 2b indicates a position when the second area LA 2 is arranged on the + Y side and + X side of the first area LA 1.
- the sign LA2. Indicates a position when the second area LA 2 is arranged on the most ⁇ Y side and the + X side of the first area LA-1.
- Reference sign LA 2 d indicates a position when the second area LA 2 is arranged at the most —Y side and —X side of the first area LA 1.
- the inner area connecting the centers of the second areas LA 2a to A 2d is the first area SR 1.
- the movement range of the substrate stage PST is limited to the first range SR1, so that the first area AL1 and the second area AL1 are always fixed.
- the liquid 1 can be held between the area AL 2 and the inconvenience such as leakage of the liquid 1 can be prevented.
- the controller CONT moves the movement range of the substrate stage PST to the second range SR 2 which is wider than the first range SR 1.
- the first range SR 1 is included in the second range SR 2.
- the liquid supply mechanism (10) stops supplying the liquid 1
- the substrate stage is restricted by restricting to the second range SR2 larger than the first range SR1.
- Predetermined operations such as the operation of the PST moving to the loading / unloading position of the substrate P can be smoothly performed.
- each embodiment of the present invention has been specifically described. In the present invention, when an abnormality is detected by a control device provided in the exposure apparatus, the control apparatus controls an appropriate mechanism or apparatus of the exposure apparatus.
- FIG. 23 summarizes the relationship between a detection part for detecting an abnormality, a control device, and a controlled part controlled by the control device.
- the control device of the exposure apparatus is provided with various detection devices provided inside the exposure apparatus. For example, as described above, the supply-side flow meter or the recovery-side flow meter alone or an abnormality (liquid flow) due to a difference in flow rate between them.
- Supply / recovery flowmeters that detect flow, stage interferometers that measure the stage position of the substrate stage to detect abnormal stage position (the occurrence of water leakage), and stage position abnormalities that measure the focus state of the substrate stage
- Focus detection system that detects leaks (water leakage)
- leak detectors 1 and 2 that detect water leaks (abnormalities) attached to optical fibers and prisms provided on the substrate stage and base plate
- the water level of the recovery tank It is connected to various detection systems, such as a water level meter that detects an abnormality in the amount of water collected from the water.
- the controller can receive abnormal signals from those detection systems. At this time, the control device can determine whether the signal is normal or abnormal by comparing the predetermined reference signal with the signal received from each detector.
- the control device of the exposure apparatus is also connected to various related devices outside the exposure apparatus, such as a liquid (pure water) production device, a liquid (pure water) temperature control device, a developing device, and a substrate transfer device. Can be received. Further, the control device of the exposure apparatus can receive a signal indicating an abnormality in a factory where the exposure apparatus is installed. Abnormalities in factories where the exposure equipment is installed include abnormalities in the clean room where the exposure equipment is located, abnormalities in the capacity of pure water and power supplied to the exposure equipment, earthquakes and fires. The control device may determine whether the signal is normal or abnormal by comparing a predetermined reference signal with a signal received from each related device.
- the control device of the exposure apparatus further includes a controlled device, for example, a liquid supply mechanism, a liquid recovery mechanism, a stage device, and particularly a stage air. It is connected to sensors such as bearings, stage linear motors, substrate holder suction systems, photomultipliers, and various other components such as vibration proof units and actuators. Can be received. If a sensor for detecting an earthquake is provided, the control device can also receive an abnormal signal from the earthquake sensor. If a water quality sensor for measuring the quality of liquid 1 (temperature, 'dissolved oxygen concentration, ratio of impurities such as organic matter) is provided, an abnormal signal can be received from the water quality sensor. The control operation of the control device will be briefly described with reference to FIG.
- the control device receives a signal indicating an abnormality from a detection system inside the exposure apparatus or related devices 1 to 4 outside the exposure apparatus.
- the signal indicating an abnormality is, for example, a signal that affects the flow of the liquid supplied (further collected) for immersion exposure.
- the control device may compare the received signal with the reference signal to determine that the received signal is an abnormal signal.
- the controller identifies the part where the abnormality has occurred from the abnormality signal.
- the control device may issue an alarm using an alarm device.
- the control device determines which device should be controlled according to the portion where the abnormality has occurred, and sends a control signal to the device to deal with the abnormal situation.
- a leak detector 1 (such as an optical fiber) provided on the substrate stage detects a liquid leak
- the control device responds to the detection signal to supply the liquid by the liquid supply device and to control the stage.
- System, the stage air bearing and the suction by the substrate holder suction system, and the power supply to the stage linear motor, the substrate holder suction system, the sensor, the vibration isolator, and the actuator are all stopped. Only the liquid recovery of the recovery mechanism can be continued.
- the control unit determines which device should be stopped according to the location of the liquid leak and its degree (signal magnitude).
- electric equipment such as a stage linear motor or a sensor can be operated as it is, and only the operation of the liquid supply mechanism can be stopped.
- pure water was used as the liquid 1 in the present embodiment. Pure water can be easily obtained in large quantities at semiconductor manufacturing factories, etc. There is an advantage that there is no adverse effect on optical elements (lenses). In addition, pure water has no adverse effect on the environment and has an extremely low impurity content, so that the surface of the substrate P and the surface of the optical element provided on the front end surface of the projection optical system PL are cleaned. Can also be expected. It is said that the refractive index n of pure water (water) with respect to the exposure light E having a wavelength of about 193 nm is about 1.44, and that the ArF excimer laser light is used as the light source of the exposure light EL.
- the wavelength is shortened to 1 / n on the substrate P, that is, about 134 nm, and high resolution is obtained. Furthermore, since the depth of focus is expanded to about n times, or about 1.44 times, compared to that in the air, if it is sufficient to secure the same depth of focus as when using it in the air, The numerical aperture of the projection optical system PL can be further increased, and the resolution is also improved in this respect.
- the optical element 2 is attached to the tip of the projection optical system PL.
- the optical element to be attached to the tip of the projection optical system PL includes the optical characteristics of the projection optical system PL, such as aberration (spherical aberration).
- a parallel plane plate that can transmit the exposure light EL may be used.
- the transmittance of the projection optical system PL and the exposure on the substrate P during transportation, assembly, and adjustment of the exposure unit EX Even if a substance (for example, a silicon-based organic substance) that reduces the illuminance and uniformity of the illuminance distribution of the light EL adheres to the parallel flat plate, just replace the parallel flat plate immediately before supplying the liquid 1. This has the advantage that the replacement cost is lower than in the case where the optical element in contact with the liquid 1 is a lens.
- the surface of the optical element that comes into contact with the liquid 1 due to scattering particles generated from the resist by the exposure of the exposure light EL, or the adhesion of impurities in the liquid 1, etc. becomes dirty.
- this optical element an inexpensive parallel flat plate, the cost of replacement parts and the time required for replacement can be shortened compared to a lens, and maintenance costs ( An increase in running cost and a decrease in throughput can be suppressed.
- the liquid 1 of the present embodiment is water, a liquid other than water may be, example, if the light source of the exposure light EL is an F 2 laser, this F 2 laser light passes through the water in Do Ino, in this case, it may be used fluorine-based liquid such as permeable as fluorine-based for oil Ya perfluoropolyether (PFPE) the F 2 laser light as the liquid 1.
- PFPE perfluoropolyether
- the liquid 1 also has a high refraction index as much as possible because it has transparency to the exposure light EL and is stable against the projection optical system PL and the photo resist applied to the surface of the substrate P. It is also possible to use other suitable materials (for example, Seda Oil).
- the shape of the nozzle described above is not particularly limited.
- supply or recovery of the liquid 1 may be performed with two pairs of nozzles on the long side of the projection area AR1.
- the supply nozzle and the recovery nozzle are arranged vertically. May be.
- the substrate P in each of the above embodiments is used not only for a semiconductor wafer for manufacturing a semiconductor device, but also for a glass substrate for a display device, a ceramic wafer for a thin-film magnetic head, or an exposure apparatus.
- the exposure apparatus that locally fills the space between the projection optical system PL and the substrate P with the liquid is employed, but the stage holding the substrate to be exposed is moved in the liquid tank.
- the present invention is also applicable to an immersion exposure apparatus for forming a liquid tank having a predetermined depth on a stage and holding a substrate therein.
- the exposure apparatus EX includes a step-and-scan type scanning exposure apparatus (scanning stepper) that scans and exposes the pattern of the mask M by synchronously moving the mask M and the substrate P, as well as the mask M and the substrate.
- the present invention can also be applied to a step-and-repeat type projection exposure apparatus (stepper) in which the pattern of the mask M is exposed collectively while the substrate P is stationary and the substrate P is sequentially moved stepwise.
- the present invention is also applicable to a step-and-stitch type exposure apparatus that transfers at least two patterns on the substrate P while partially overlapping each other.
- the present invention can also be applied to a twin-stage type exposure apparatus including two stages capable of independently placing substrates to be processed such as wafers and moving independently in the X and Y directions.
- a twin-stage type exposure apparatus including two stages capable of independently placing substrates to be processed such as wafers and moving independently in the X and Y directions.
- the structure and exposure operation of a twin-stage type exposure apparatus are described in, for example, Japanese Patent Application Laid-Open Nos. 10-16309 and 10-214783 (corresponding US Pat. Nos. 6,341,007, 6 ', 400,441,6). , 549, 269 and 6,590, 634), Table 2000-505958 (corresponding U.S. Patent 5,969,441) or U.S. Patent 6,208,407, which are designated or selected in this international application. To the extent permitted by applicable national law, these disclosures are incorporated by reference into the text.
- the present invention is also applied to an exposure apparatus provided with a substrate stage for holding a substrate P and a measurement stage provided with various measurement members and sensors. Can be applied. In this case, it is possible to hold the liquid between the projection optical system and the upper surface of the measurement stage, and this measurement stage can also be provided with measures such as the above-described water leak detector.
- the type of exposure equipment EX is not limited to semiconductor equipment manufacturing exposure equipment that exposes a semiconductor element pattern to the substrate P, but is used for liquid crystal display element manufacturing or display manufacturing.
- the present invention can be widely applied to an exposure apparatus for manufacturing a thin film magnetic head, an image sensor (CCD), a reticle or a mask, and the like.
- each of the stages PST and MST may be of a type that moves along a guide or a guideless type that does not have a guide. Examples of using a linear motor for the stage are disclosed in U.S. Patent Nos. 5,623,853 and 5,528,118, each of which is permitted by the laws of the country designated or selected in this international application. To the extent possible, the contents of these documents are incorporated and incorporated as part of the text.
- each stage PST, MST is such that a magnet unit with a two-dimensionally arranged magnet and an armature unit with a two-dimensionally arranged coil are opposed to each other, and each stage PST, MST is driven by electromagnetic force.
- a planar motor for driving T may be used.
- one of the magnet unit and the armature unit is connected to the stage PST and MST, and the other of the magnet unit and the armature unit is connected to the stage PST and the moving surface of the MS ⁇ . May be provided.
- the reaction force generated by the movement of the substrate stage PST may be mechanically released to the floor (ground) using a frame member so as not to be transmitted to the projection optical system PL.
- the exposure apparatus EX of the present embodiment is manufactured by assembling various subsystems including the respective constituent elements recited in the claims of the present application so as to maintain predetermined mechanical accuracy, electrical accuracy, and optical accuracy. Is done. To ensure these various precisions, before and after this assembly, adjustments to achieve optical precision for various optical systems, adjustments to achieve mechanical precision for various mechanical systems, various Electric systems will be adjusted to achieve electrical accuracy.
- the assembly process from the various subsystems to the exposure apparatus includes mechanical connections, wiring connections of electric circuits, and piping connections of pneumatic circuits between the various subsystems. It goes without saying that there is an individual assembly process for each subsystem before the assembly process from these various subsystems to the exposure apparatus.
- the exposure apparatus be manufactured in a clean room in which the temperature, cleanliness, etc. are controlled. As shown in Fig.
- a micro device such as a semiconductor device has a step 201 for designing the function and performance of the micro device, a step 202 for manufacturing a reticle (mask) based on this design step, Step 203 for manufacturing a substrate as a substrate of the device, Step 204 for exposing a reticle pattern to the substrate using the exposure apparatus EX of the above-described embodiment, Step for assembling a device (dicing step, bonding step) , Including the package process) 205, inspection step 206, etc.
- INDUSTRIAL APPLICABILITY According to the present invention, an abnormality in an internal apparatus of an exposure apparatus or an external related apparatus that affects immersion exposure is detected, and peripheral devices and members due to leakage or intrusion of an exposure liquid are detected. Dew Since the influence on the optical operation can be suppressed or reduced, the good condition of the expensive exposure apparatus can be maintained, and the liquid immersion exposure processing can be performed with high accuracy. Thereby, a device having desired performance can be manufactured.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Epidemiology (AREA)
- Public Health (AREA)
- Atmospheric Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Toxicology (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
Abstract
Description
Claims
Priority Applications (18)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020127010893A KR101403117B1 (ko) | 2003-07-28 | 2004-07-26 | 노광 장치 및 디바이스 제조 방법, 그리고 노광 장치의 제어 방법 |
KR1020137015069A KR101414896B1 (ko) | 2003-07-28 | 2004-07-26 | 노광 장치 및 디바이스 제조 방법, 그리고 노광 장치의 제어 방법 |
KR1020117020276A KR101298864B1 (ko) | 2003-07-28 | 2004-07-26 | 노광 장치 및 디바이스 제조 방법, 그리고 노광 장치의 제어 방법 |
KR1020177028137A KR101935709B1 (ko) | 2003-07-28 | 2004-07-26 | 노광 장치 및 디바이스 제조 방법, 그리고 노광 장치의 제어 방법 |
KR1020147003636A KR101599649B1 (ko) | 2003-07-28 | 2004-07-26 | 노광 장치 및 디바이스 제조 방법, 그리고 노광 장치의 제어 방법 |
EP04748150A EP1653501B1 (en) | 2003-07-28 | 2004-07-26 | Exposure apparatus, device producing method, and exposure apparatus controlling method |
KR1020147026289A KR101641011B1 (ko) | 2003-07-28 | 2004-07-26 | 노광 장치 및 디바이스 제조 방법, 그리고 노광 장치의 제어 방법 |
KR1020167019452A KR101785707B1 (ko) | 2003-07-28 | 2004-07-26 | 노광 장치 및 디바이스 제조 방법, 그리고 노광 장치의 제어 방법 |
KR1020157020237A KR101642670B1 (ko) | 2003-07-28 | 2004-07-26 | 노광 장치 및 디바이스 제조 방법, 그리고 노광 장치의 제어 방법 |
KR1020187037957A KR20190002749A (ko) | 2003-07-28 | 2004-07-26 | 노광 장치 및 디바이스 제조 방법, 그리고 노광 장치의 제어 방법 |
US11/338,661 US8451424B2 (en) | 2003-07-28 | 2006-01-25 | Exposure apparatus, method for producing device, and method for controlling exposure apparatus |
US11/366,743 US7505115B2 (en) | 2003-07-28 | 2006-03-03 | Exposure apparatus, method for producing device, and method for controlling exposure apparatus |
HK06111843.0A HK1090175A1 (en) | 2003-07-28 | 2006-10-26 | Exposure apparatus, device producing method, and exposure apparatus controlling method |
US13/751,509 US8749757B2 (en) | 2003-07-28 | 2013-01-28 | Exposure apparatus, method for producing device, and method for controlling exposure apparatus |
US14/264,711 US9494871B2 (en) | 2003-07-28 | 2014-04-29 | Exposure apparatus, method for producing device, and method for controlling exposure apparatus |
US15/332,509 US9760026B2 (en) | 2003-07-28 | 2016-10-24 | Exposure apparatus, method for producing device, and method for controlling exposure apparatus |
US15/689,321 US10185232B2 (en) | 2003-07-28 | 2017-08-29 | Exposure apparatus, method for producing device, and method for controlling exposure apparatus |
US16/223,802 US20190121246A1 (en) | 2003-07-28 | 2018-12-18 | Exposure apparatus, method for producing device, and method for controlling exposure apparatus |
Applications Claiming Priority (4)
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JP2003281183 | 2003-07-28 | ||
JP2003-281183 | 2003-07-28 | ||
JP2004045104 | 2004-02-20 | ||
JP2004-045104 | 2004-02-20 |
Related Child Applications (1)
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US11/338,661 Continuation US8451424B2 (en) | 2003-07-28 | 2006-01-25 | Exposure apparatus, method for producing device, and method for controlling exposure apparatus |
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WO2005010962A1 true WO2005010962A1 (ja) | 2005-02-03 |
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PCT/JP2004/010991 WO2005010962A1 (ja) | 2003-07-28 | 2004-07-26 | 露光装置及びデバイス製造方法、並びに露光装置の制御方法 |
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US (7) | US8451424B2 (ja) |
EP (4) | EP2264534B1 (ja) |
JP (13) | JP2010118689A (ja) |
KR (10) | KR101343720B1 (ja) |
CN (4) | CN102043350B (ja) |
HK (5) | HK1090175A1 (ja) |
TW (8) | TWI490916B (ja) |
WO (1) | WO2005010962A1 (ja) |
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