WO2007083758A1 - 移動体駆動方法及び移動体駆動システム、パターン形成方法及びパターン形成装置、露光方法及び露光装置、並びにデバイス製造方法 - Google Patents
移動体駆動方法及び移動体駆動システム、パターン形成方法及びパターン形成装置、露光方法及び露光装置、並びにデバイス製造方法 Download PDFInfo
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- WO2007083758A1 WO2007083758A1 PCT/JP2007/050821 JP2007050821W WO2007083758A1 WO 2007083758 A1 WO2007083758 A1 WO 2007083758A1 JP 2007050821 W JP2007050821 W JP 2007050821W WO 2007083758 A1 WO2007083758 A1 WO 2007083758A1
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- Prior art keywords
- moving body
- encoder
- drive system
- measurement
- interferometer
- Prior art date
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Definitions
- MOBILE BODY DRIVING METHOD MOBILE BODY DRIVING SYSTEM
- PATTERN FORMING METHOD PATTERN FORMING APPARATUS
- EXPOSURE METHOD EXPOSURE APPARATUS
- the present invention relates to a moving body driving method and a moving body driving system, a pattern forming method and a pattern forming apparatus, an exposure method and an exposure apparatus, and a device manufacturing method.
- a moving body driving method for driving in a direction, a moving body driving system suitable for applying the method, a pattern forming method using the moving body driving method, a pattern forming apparatus including the moving body driving system, and the moving body driving method The present invention relates to an exposure method using a method, an exposure apparatus including a moving body drive system, and a device manufacturing method using the pattern formation method.
- stepper step 'and' repeat type reduction projection exposure apparatus
- scanning stepper also called a scanner
- a wafer stage that holds the wafer is driven in the XY two-dimensional direction, for example, by a linear motor or the like.
- The in the case of a scanning stepper, not only the wafer stage but also the reticle stage is driven with a predetermined stroke in the scanning direction by a linear motor or the like. Measurement of the position of the reticle stage and wafer stage is generally performed using a high-resolution laser interferometer with stable measurement values over a long period of time.
- Patent Document 1 US Pat. No. 6,639,686
- the present invention is a moving body driving method for driving a moving body in at least one uniaxial direction.
- the position information of the direction is measured using the first measuring device and the second measuring device, which has superior short-term stability of the measured value compared to the first measuring device, and the first and second measuring devices measure the position information.
- the measurement value of the first measurement device is corrected by the calibration operation described above, and the measurement value of the second measurement device, which has superior short-term stability of the measurement value compared to the first measurement device, is corrected. Yes Correction information is determined. Then, the moving body is driven in the uniaxial direction based on the measurement value of the second measuring device and the correction information. Therefore, based on the measured value of the second measuring device corrected using the correction information, that is, the measured value of the position information in the uniaxial direction of the moving object that has good short-term stability and long-term stability, the moving object Can be driven accurately in one axial direction.
- the present invention is a moving body driving method for driving a moving body in a two-dimensional plane parallel to the first and second axes orthogonal to each other, and A pair of gratings that are periodically arranged in a direction parallel to the first axis in a plane parallel to the two-dimensional plane, respectively, and are arranged apart from each other in a direction perpendicular to the longitudinal direction in the plane 1st gray Measuring the position information of the moving body in a direction parallel to the first axis, and parallel to the two-dimensional surface on the moving body.
- a second grating including a grating that is arranged on a flat surface extending in a direction intersecting with the longitudinal direction of each of the first gratings as a longitudinal direction and periodically arranged in a direction parallel to the second axis, and the second grating Position information in a direction parallel to the second axis of the moving body is measured by a second encoder having a head unit that intersects the longitudinal direction, and based on the measured position information, the moving body is measured.
- 2 is a second moving body driving method for driving the motor.
- the head unit included in the first encoder faces at least one of the pair of first gratings
- the head unit included in the second encoder faces the second grating.
- a moving body driving method for driving a moving body in at least a uniaxial direction, wherein detection light is applied to a grating disposed on the upper surface of the moving body with a predetermined direction as a periodic direction. Based on measurement values of an encoder that irradiates and measures positional information of the moving body in the predetermined direction based on reflected light, and correction information of the pitch of the grating, the moving body is A third moving body driving method including a step of driving in a direction.
- a method of forming a pattern on an object, and any one of the first to third moving body driving methods of the present invention for forming a pattern on the object is provided.
- a pattern can be accurately formed on an object.
- a method for forming a pattern on an object, and for forming a pattern on the object, any one of the first to third moving body driving methods of the present invention Is used to drive at least one of a plurality of moving bodies including the moving body on which the object is placed.
- At least one of the plurality of moving bodies is driven with high accuracy using any one of the first to third moving body driving methods of the present invention to form a pattern on the object, and A pattern is generated on an object placed on any moving body.
- a device manufacturing method including a pattern forming step, and in the pattern forming step, any one of the first and second pattern forming methods of the present invention is performed.
- a device manufacturing method for forming a pattern on a substrate by using the device is provided.
- an exposure method for forming a pattern on an object by irradiation with an energy beam wherein the energy beam and the object move relative to each other.
- the object is mounted using any one of the first to third moving body driving methods of the present invention.
- the placed movable body is driven with high accuracy. Therefore, it is possible to accurately form a pattern on the object by scanning exposure.
- a moving body drive system that drives a moving body in at least one axial direction, and a first measurement device that measures positional information of the moving body in the uniaxial direction;
- a second measuring device that measures positional information of the movable body in the uniaxial direction and has a short-term stability of a measured value that is superior to that of the first measuring device; and a measured value of the second measuring device that is the first measuring device.
- a calibration device that performs a calibration operation for determining correction information to be corrected using the measured value of the measurement; driving the moving body in the uniaxial direction based on the measurement value of the second measurement device and the correction information
- a first mobile drive system comprising: is there.
- the above-described calibration operation is executed by the calibration device, and the second measurement device that uses the measurement value of the first measurement device and has superior short-term stability of the measurement value compared to the first measurement device.
- Correction information for correcting the measured value of the device is determined.
- the moving body is driven in the uniaxial direction by the drive device based on the measurement value of the second measurement device and the correction information. Therefore, based on the measured values of the second measuring device corrected using the correction information, that is, the short-term stability, as well as the long-term stability, the measured value of the position information about the uniaxial direction of the moving object V, The moving body can be driven with high accuracy in the uniaxial direction.
- the present invention provides a moving body drive system that drives a moving body in a two-dimensional plane parallel to the first and second axes orthogonal to each other, and A first grating including a grating arranged on a plane parallel to a two-dimensional plane and periodically arranged in a direction parallel to the first axis; on a plane parallel to the two-dimensional plane on the moving body; A direction that intersects the longitudinal direction of the first darling extends as a longitudinal direction, and is disposed apart in a direction perpendicular to the longitudinal direction, and is periodically arranged in a direction parallel to the second axis.
- a pair of second gratings each including a grating; a head unit intersecting with a longitudinal direction of the first grating, and positional information in a direction parallel to the first axis of the movable body together with the first grating.
- a first encoder for measuring; and the pair of A second encoder that has a head unit that intersects with the longitudinal direction of the second grating, and that measures positional information in a direction parallel to the second axis of the moving body together with the pair of second gratings; And a driving device that drives the moving body based on position information measured by the second encoder.
- the position information in the direction parallel to the first axis of the moving body is measured by the first grating and the first encoder, and the moving body is measured by the second grating and the second encoder.
- Position information in the direction parallel to the second axis is measured. Since the first and second encoders have good short-term stability of measured values, the position information of the moving object in the two-dimensional plane can be measured with high accuracy. And this spirit
- the moving body is driven based on the position information of the moving body that is frequently measured. Therefore, the moving body can be driven with high accuracy.
- the present invention is a moving body drive system that drives a moving body in a two-dimensional plane parallel to the first and second axes orthogonal to each other.
- a first grating extending in a direction parallel to the two axes and having a grating periodically arranged in a direction parallel to the first axis; and a direction parallel to the first axis on the movable body
- a second grating in which gratings are periodically arranged in a direction parallel to the second axis; a head unit intersecting the direction parallel to the second axis; and the first
- a first encoder that measures positional information in a direction parallel to the first axis of the moving body together with a grating; a head unit that intersects the direction parallel to the first axis, and the second gray
- the position information of the moving body in a direction parallel to the second axis is measured together with the tin Two encoders; and a driving device that drives the movable body based on position information
- the position information in the direction parallel to the first axis and the direction in the direction parallel to the second axis of the moving body are obtained by the first grating and the first encoder, and the second grating and the second encoder.
- rotation in the 2D plane rotation around an axis perpendicular to the 2D plane
- position information (including rotation information) in the two-dimensional plane of the moving object is accurately measured.
- the moving body is driven by the driving device based on the position information of the moving body measured with high accuracy. Therefore, it is possible to drive the moving body with high accuracy.
- a moving body drive system for driving the moving body in at least one axial direction, wherein the detection light is applied to a lattice disposed on the upper surface of the moving body with a predetermined direction as a periodic direction And an encoder for measuring position information of the moving body in the predetermined direction based on the reflected light; and based on measurement values of the encoder and correction information of the pitch of the grating! / And a driving device that drives the moving body in the predetermined direction.
- the moving body is driven in a predetermined direction by the driving device based on the measurement value of the encoder and the correction information of the pitch of the grating. Therefore, it is possible to drive the moving body with high accuracy without being affected by the drift of the lattice pitch.
- the present invention is an apparatus for forming a pattern on an object, which also has the power of the twelfth aspect, and a patterning apparatus for generating a pattern on the object;
- the pattern is generated on the object on the moving body driven with high accuracy by any one of the first to fourth moving body drive systems of the present invention, and the pattern is generated on the object.
- the pattern can be formed with high accuracy.
- the present invention also provides a device for forming a pattern on an object, the patterning device for generating a pattern on the object, and a plurality of moving bodies on which the object is placed. And at least one drive of the plurality of moving bodies by the moving body drive system for forming a pattern on the object comprising: a moving body; and any one of the first to fourth moving body drive systems of the present invention; 2 is a second pattern forming apparatus for performing
- At least one of the plurality of moving bodies is accurately driven by any one of the first to fourth moving body driving systems of the present invention.
- a pattern is generated on an object placed on one of the moving objects by the apparatus.
- an exposure apparatus for forming a pattern on an object by irradiation with an energy beam
- the patterning apparatus for irradiating the object with the energy beam
- the first to fourth moving body drive systems are provided with a misalignment mechanism, and for the relative movement between the energy beam and the object, the moving body drive system drives the moving body on which the object is placed. This is a first exposure apparatus to be performed.
- the object can be moved by any one of the first to fourth moving body drive systems of the present invention because of the relative movement between the energy beam applied to the object and the object with the patterning device force.
- the moving body to be placed is driven with high accuracy. Therefore, by scanning exposure, the object A pattern can be formed on the top with high accuracy.
- scanning exposure in which a mask and an object are synchronously moved in a predetermined scanning direction to transfer a pattern formed on the mask to a partitioned area on the object, and A step of alternately repeating the movement of the object for scanning exposure of the divided area of the image by an exposure method in which the pattern is sequentially transferred to a plurality of divided areas on the object by executing an AND scanning operation.
- the position information of the mask stage holding the mask is measured by an encoder during the scanning exposure for at least each of the divided areas, and the measured value of the encoder and the mask stage by the encoder and the interferometer are measured.
- the movement of the mask stage is controlled based on the correction information of the measurement value of the encoder determined from the position information of the encoder, and the step-and-scan A second exposure method of calibrating the correction information based on the measurement values of the interferometer and the encoder stored in the formula of the exposure operation.
- the movement of the mask stage at the time of scanning exposure (pattern transfer) to each partition area was corrected using the correction information. It is possible to control with high accuracy based on the measurement value of the encoder, that is, the short-term stability, as well as the measurement value of the position information in the scanning direction of the mask stage, which has good linearity and long-term stability. As a result, the pattern formed on the mask can be accurately transferred to a plurality of partitioned areas on the object by scanning exposure.
- the scanning exposure in which the mask and the object are synchronously moved in a predetermined scanning direction to transfer the pattern formed on the mask to the partitioned area on the object, and Step of alternately repeating the movement of the object for scanning exposure of the partition area of the exposure apparatus.
- An exposure apparatus that performs an exposure operation of an AND scan method, and can move in the scanning direction at least by holding the mask.
- the measured value of the encoder, and the position information force of the mask stage by the encoder and the interferometer are supplemented with the measured value of the encoder.
- Based on positive information Control the movement of the mask stage, the step-and-scan exposure And a controller for calibrating the correction information.
- the control device when performing the exposure operation of the step-and-scan method in which the control device sequentially transfers the pattern to the plurality of partitioned areas on the object, measures the encoder during the scanning exposure for each partitioned area. Based on the value and the correction information of the measurement value of the encoder determined from the position information of the mask stage by the encoder and the interferometer! Calibration information is calibrated based on the interferometer and encoder measurement values accumulated during the exposure operation. Therefore, the movement of the mask stage during scanning exposure (during pattern transfer) for each partitioned area on the object after the calibration is corrected by using the corrected correction information.
- the pattern formed on the mask can be accurately transferred to a plurality of divided areas on the object by scanning exposure.
- the exposure of transferring the pattern formed on the mask onto the object by synchronously moving the mask and the object in a predetermined scanning direction with respect to the illumination light.
- An optical device which holds the mask and is movable at least in the scanning direction; an object stage which holds the object and is movable at least in the scanning direction; and An interferometer and an encoder for measuring a position; the mask stage is driven in the scanning direction at a low speed such that short-term fluctuations in measurement values of the interferometer are negligible, and the mask stage is moved using the interferometer and the encoder.
- Measure position information in the scanning direction and based on the measurement results of the interferometer and encoder, correct the encoder measurement values using the interferometer measurement values.
- a calibration device that determines correction information to be corrected; and a control device that controls movement of the mask stage during transfer of the pattern based on the measurement value of the encoder and the correction information. 3 is an exposure apparatus.
- the calibration device can ignore the short-term fluctuation of the interferometer measurement value.
- the mask stage is driven in the scanning direction at low speed, and the position information in the scanning direction of the mask stage is measured using the interferometer and encoder. Based on the measurement results of the interferometer and encoder, the encoder measurement values are obtained. Correction information to be corrected using the measured value of the interferometer, that is, the measured value of the interferometer, which has superior linearity and long-term stability of the measured value compared to the encoder, and the short-term measured value compared to the interferometer Correction information for correcting the measurement value of the encoder with excellent stability is determined.
- the control device controls the movement of the mask stage during the transfer of the no-turn based on the measurement value of the encoder and the correction information. Therefore, the measured value of the encoder corrected using the correction information, that is, the measured value of the position information in the scanning direction of the mask stage, which has good linearity and long-term stability as well as short-term stability, is used during pattern transfer. It is possible to accurately control the movement of the mask stage in the scanning direction. As a result, the pattern formed on the mask can be accurately transferred onto the object by scanning exposure.
- the exposure of transferring the pattern formed on the mask onto the object by synchronously moving the mask and the object in a predetermined scanning direction with respect to the illumination light.
- An optical device which holds the mask and is movable at least in the scanning direction; an object stage which holds the object and is movable at least in the scanning direction; and An interferometer and an encoder that measure position information; and the mask stage includes a first position and a second position that are positions at both ends of a range in which the illumination light is irradiated onto the pattern area of the mask to be exposed.
- the measurement values of the interferometer and encoder are acquired at a predetermined sampling interval, and based on the acquired measurement values, the measurement values of the interferometer and the previous values are obtained.
- a calibration device that executes a calibration operation for correcting a scaling error of map information indicating a relationship with a measurement value of the encoder; and based on the measurement value of the encoder and the corrected map information, And a control device that controls the movement of the mask stage.
- the calibration device causes the mask stage to be positioned at a plurality of positions including the first position and the second position, which are positions at both ends of the range in which the illumination light passes through the pattern area of the mask to be exposed. While positioning each, the measured values of the interferometer and encoder are sampled. A calibration operation is performed to correct the scaling error of the map information indicating the relationship between the measured value of the interferometer and the measured value of the encoder based on the acquired measured value. In other words, there is a scaling error in the map information indicating the relationship between the interferometer with superior linearity and long-term stability of measured values compared to an encoder and the measured value of an encoder with superior short-term stability of measured values compared to the interferometer.
- the movement of the mask stage at the time of pattern transfer is controlled by the control device based on the measured value of the encoder and the corrected map information. Therefore, the movement of the mask stage in the scanning direction during pattern transfer can be accurately controlled based on the corrected map information and the measured value of the encoder.
- FIG. 1 is a drawing schematically showing a configuration of an exposure apparatus according to an embodiment.
- FIG. 2 is a plan view showing the reticle stage together with an encoder system and an interferometer system for measuring position information of the reticle stage.
- FIG. 3 is a plan view showing a wafer stage together with an encoder and an interferometer for measuring positional information of the wafer stage.
- FIG. 4 is a diagram showing a Y interferometer that measures the position of the wafer stage WST in FIG. 1, a Z interferometer, and components in the vicinity thereof.
- FIG. 4 is a diagram showing a Y interferometer that measures the position of the wafer stage WST in FIG. 1, a Z interferometer, and components in the vicinity thereof.
- FIG. 5 is a diagram illustrating an example of the configuration of an encoder.
- FIG. 6 is a block diagram showing a part of the control system related to the stage control of the exposure apparatus according to the embodiment.
- FIG. 7 is a diagram (part 1) for explaining the switching operation of the position measurement system.
- FIG. 8 is a diagram (part 2) for explaining the switching operation of the position measurement system.
- FIG. 9 is a diagram (No. 1) for explaining a reticle stage scanning operation for exposure including a reticle-side encoder switching (measurement value linking) operation.
- FIG. 10 is a diagram (No. 2) for explaining the reticle stage scan operation for exposure including the reticle-side encoder switching (measurement value linking) operation.
- FIG. 11 is a diagram (No. 3) for explaining the reticle stage scan operation for exposure including the reticle-side encoder switching (measurement value linking) operation.
- FIG. 12 shows a state where the wafer stage is located at a position where the vicinity of the center of the wafer is directly below the projection unit, and
- FIG. 12 (B) shows the vicinity of the middle between the center and the outer periphery of the wafer.
- FIG. 6 is a view showing a state where the wafer stage is at a position directly below the projection unit.
- FIG. 13 (A) shows a state where the wafer stage is located at a position where the vicinity of the + Y side edge of the wafer is directly below the projection unit PU
- FIG. 13 (B) is a view from the center of the wafer. It is a diagram showing a state where the wafer stage is located at a position where the vicinity of the edge in the direction forming 45 ° with respect to the X axis and the Y axis is directly below the projection unit PU.
- FIG. 14 is a diagram showing a state where the wafer stage is located at a position where the vicinity of the + X side edge of the wafer is directly below the projection unit PU.
- FIG. 8 is a diagram (part 1) for explaining the Yong operation.
- FIG. 6 is a diagram (part 2) for explaining the Yong operation.
- FIG. 18 is a diagram showing an example of a map obtained by the second calibration operation.
- FIG. 20 is a diagram for explaining the long-term calibration operation (first calibration operation) of the measurement values of the encoders 50A to 50D, that is, the operation for acquiring the grid pitch correction information and the grid deformation correction information of the moving scale. is there.
- FIG. 21 is a diagram showing interferometer and encoder measurement values obtained by successive calibration of encoder measurement errors.
- FIG. 22 is a diagram (No. 1) for explaining an operation of acquiring correction information of grating pitches of moving scales 44A and 44C according to a modification.
- FIG. 23 is a diagram (No. 2) for explaining the operation of acquiring the correction information of the lattice pitch of the moving scales 44A and 44C according to the modification.
- FIG.24 Deformation of lattice line (grid line bending) of moving scales 44B and 44D according to the modification example It is a figure for demonstrating acquisition operation
- FIG. 25 is a view showing a modification of the encoder system for the wafer stage.
- FIG. 26 is a view showing another modification of the encoder system for the wafer stage.
- FIG. 27 is a view showing a modification of the wafer stage used in the immersion exposure apparatus.
- FIG. 1 shows a schematic configuration of an exposure apparatus 100 according to an embodiment.
- the exposure apparatus 100 is a step-and-scan type scanning exposure apparatus, that is, a so-called scanning stepper.
- the projection optical system PL is provided.
- the direction parallel to the optical axis AX of the projection optical system PL is the Z-axis direction, and in a plane perpendicular to the Z-axis direction.
- the direction in which the reticle and wafer are relatively scanned is the Y-axis direction
- the direction orthogonal to the Z-axis and Y-axis is the X-axis direction
- the rotation (tilt) directions around the X-axis, Y-axis, and Z-axis are each 0 x , 0 y, and ⁇ z directions.
- Exposure apparatus 100 includes a light source and an illumination optical system, illumination system 10 that illuminates reticles Rl and R2 with illumination light (exposure light) IL, reticle stage RST that holds reticles Rl and R2, projection unit PU, It includes a wafer stage device 12 including a wafer stage WST on which a wafer W is placed, a body BD on which a reticle stage RST and a projection unit PU are mounted, a control system for these, and the like.
- the illumination system 10 is configured to substantially illuminate a slit-like illumination area IAR (see Fig. 2) extending in the X-axis direction on a reticle R1 or R2 defined by a reticle blind (masking system) (not shown) by illumination light IL. Illuminate with uniform illumination.
- the illumination light IL for example, ArF excimer laser light (wavelength 193 nm) is used.
- the reticle stage RST has a clearance of, for example, about several m on a reticle base 36 constituting a top plate of the second column 34 described later by an air bearing (not shown) provided on the bottom surface thereof. Is supported through.
- reticle stage RST for example, a reticle stage that can hold one reticle, or a twin reticle stage that holds one reticle and can move independently, respectively, is used. In this embodiment, a reticle is used. Double reticle holder type reticle stage that can hold two simultaneously Page is used.
- reticle stage RST is two-dimensionally (X-axis direction, Y-axis direction) in the XY plane perpendicular to optical axis AX of projection optical system PL by reticle stage drive system 11 including a linear motor. And in the ⁇ z direction). Also, reticle stage RST can be driven on reticle base 36 by reticle stage drive system 11 at a scanning speed specified in a predetermined scanning direction (here, the Y-axis direction which is the horizontal direction in FIG. 1). It has been.
- the reticle stage RST may be a coarse / fine movement structure disclosed in, for example, Japanese Patent Laid-Open No. 8-130179 (corresponding to US Pat. No. 6,721,034). The structure is limited to this embodiment (FIG. 2, etc.). Is not to be done.
- Position information in the XY plane (moving plane) of reticle stage RST is reticle interference including reticle Y laser interferometer (hereinafter “reticle Y interferometer” t ⁇ ⁇ ) 16y etc. shown in FIG.
- reticle Y interferometer reticle Y interferometer 16y etc.
- FIG. Measuring system and encoder head (hereinafter abbreviated as “head”) 26A-26A, 26C
- a rectangular recess 22 elongated in the Y-axis direction (scanning direction) in plan view (viewed from above) is formed at the center of reticle stage RST.
- Two substantially square openings are formed side by side in the Y-axis direction on the inner bottom surface of the recess 22, and the reticle Rl and reticle R2 are arranged in the Y-axis direction so as to cover each of these openings. It is arranged.
- Reticles Rl and R2 are each vacuum-sucked by suction mechanisms (not shown), for example, vacuum chucks, provided on both sides in the X-axis direction of the two openings on the inner bottom surface of recess 22.
- the + X side end and the ⁇ X side end of the upper surface of the reticle stage RST are located at the center of the illumination area I AR (in this embodiment, within the first surface (object plane) of the projection optical system PL).
- the optical axis AX and a symmetrical arrangement with respect to the central axis parallel to the Y-axis direction.
- the kales 24A and 24B are extended with the Y-axis direction as the longitudinal direction.
- the moving scales 24 mm and 24 mm are made of the same material (for example, ceramics or low thermal expansion glass), and on the surface thereof, a reflection type diffraction grating having a periodic direction as a minor axis direction is symmetrical with respect to the central axis. It is formed by arrangement.
- the moving scales 24 mm and 24 mm are fixed to the reticle stage RST by, for example, vacuum suction (or leaf spring) so that local expansion and contraction does not occur.
- 26A and 26B are located on a straight line (measurement axis) in the X-axis direction that passes through the center of the illumination area IAR.
- heads 26A and 26B are arranged at positions where the measurement centers substantially coincide. Also, heads 26A and 26B
- a pair of heads 26A and 26B are arranged at positions separated from each other in the Y direction.
- the three pairs of heads 26A, 26B, 26A, 26B, 26A, 26B, 26A, 26B are provided with support members (not shown).
- a moving scale 28 with the Y-axis direction as the long direction is arranged side by side with the moving scale 24A, for example, vacuum suction (or leaf spring) For example, it is fixed to reticle stage RST.
- the moving scale 28 is made of the same material as the moving scales 24A and 24B (for example, ceramics or low thermal expansion glass), and has a reflective diffraction grating whose periodic direction is the X-axis direction on the upper surface. Is formed almost over the entire length in the Y-axis direction.
- head 26C is a straight line in the X-axis direction (total
- the head 26C is a predetermined distance from the head 26C +
- the head 2C is symmetrical to the head 26C with respect to the measurement axis on the same plane as the head 26C.
- the 6C force is also a predetermined distance—the head 26C is located at a position away from the Y direction.
- the three heads 26C, 26C, 26C are reticulated via support members (not shown).
- 6B to 26B, 26C to 26C are fixed to the reticle base 36 via a support member (not shown).
- the present invention is not limited to this.
- it may be provided on the frame member installed on the floor F or the base plate BS through a vibration isolation mechanism!
- the heads 26A, 26B and the opposed moving scales 24A, 24B are used.
- a pair of Y linear encoders that measure the position (Y position) of reticle stage RST in the Y-axis is configured.
- these Y linear encoders are described as Y linear encoders 26A and 26B using the same reference numerals as the respective heads.
- the measurement axis of the Y linear encoders 26A and 26B is the center of the illumination area IAR described above (this implementation
- the Y position of reticle stage RST is measured.
- the axis passes on the optical axis AX of the projection optical system PL. Therefore, during exposure, the Y position of reticle stage RST is set to Y linear encoder 26A.
- Rotation information (showing) in the ⁇ z direction of reticle stage RST is measured.
- the heads 26A, 26A and the moving scale 24A opposed to them are used for recording.
- the Y linear encoder force that measures the Y position of the TICKLE stage RST is configured separately. Similarly, the heads 26B and 26B and the moving scale 24B opposite to the heads 26B and 26B
- the Y linear encoder force that measures the Y position of the Kur stage RST is configured separately.
- these Y linear encoders are described as Y linear encoders 26A, 26A, 26B, and 26B using the same reference numerals as the respective heads.
- the illumination area I described above is formed by the head 26C and the moving scale 28 facing the head 26C.
- An X linear encoder is configured to measure the position (X position) of reticle stage RST in the X axis direction along a straight line (measurement axis) parallel to the X axis direction that passes through the center of AR.
- this X linear encoder is described as X linear encoder 26C using the same code as the head. Therefore, for exposure, etc., the X position of reticle stage RST
- the X linear encoder 26C can be used to measure without Abbe error.
- Each X linear encoder that measures the X position is configured.
- these X linear encoders are described as X linear encoders 26C and 26C using the same symbols as the respective heads.
- the measured value of 1 3 is sent to the main controller 20 (see Fig. 1) (see Fig. 6).
- moving scales 24A, 24B, and 28 described above have lengths in the Y-axis direction (moving scales 24mm and 24mm correspond to the diffraction grating formation range, and moving scale 28 corresponds to the diffraction grating width).
- the three moving scales 24A, 24B, 24A, 24B, and so on described above do not disable measurement by at least three linear encoders 26A, 26B, and 26C.
- 28 is the X-axis and Y-axis directions, taking into account the rotation range in the ⁇ z direction
- the size (length, width) is set.
- position information of reticle stage RST is obtained by six linear encoders 26A, 26A, 26B, 26B, 26C, and 26C.
- Information (including at least the position in the X and Y axes and the rotation information in the 0 z direction) can be measured.
- the position information of reticle stage RST (slightly) is detected by six linear encoders 26A, 26A, 26B, 26B, 26C, and 26C.
- At least the position in the X-axis and Y-axis directions and the rotation information in the 0z direction can be measured.
- reticles Rl and R2 are exchanged on the + Y side or the -Y side with respect to the illumination area IAR described above, or reticle R1 is exchanged on the Y side, and reticle R2 is exchanged on the + Y side.
- the reticle is driven by at least three linear encoders 2 6A, 26B, 26C or linear encoders 26A, 26B, 26C.
- Tage RST position information can be measured.
- the reticle stage is constituted by three moving scales 24A, 24B, 28 and a head unit having nine heads 26A-26A, 26B-26B, 26C-26C.
- the force that constitutes the encoder system for the RST encoder system is not limited to that shown in FIG. 2, for example, the head unit may have only three heads 26A, 26B, and 26C.
- the position measurement of the reticle stage RST by the linear encoders 26A, 26B, 26C becomes impossible during the reticle replacement position or in the middle of the replacement position, for example, another measuring device or the above-mentioned reticle interference
- the position of reticle stage RST may be measured using at least a part of the measuring system.
- the force that is used to fix the three moving scales 24 A, 24 B, and 28 to the reticle stage RST by an adsorption mechanism or a leaf spring is not limited to this.
- the reticle interferometer system includes a reticle Y interferometer 1 as shown in FIG. 2 and FIG.
- the reticle X interferometer 16x has a sensor head 19A (not shown in FIG. 1) as shown in FIG.
- the sensor head 19A is fixed to the upper surface of the reticle base 36, and includes therein a light source, an optical system, two analyzers (polarizers), two photoelectric conversion elements, and the like.
- a light source a dual frequency laser using the Zeeman effect is used.
- the laser beam from the light source is expanded in the horizontal direction by the optical system, and a beam BM whose cross-sectional shape is expanded is output from the sensor head 19A as shown in FIG.
- the optical system unit 19B the beam BM is divided into two, and one of the divided beams enters a first beam splitter (not shown) and is divided into a measurement beam BM and a reference beam.
- the reference beam is, for example, a reticle stage RS.
- the light is reflected by the reflecting surface of T, returns to the first beam splitter, is synthesized coaxially, and is output from the optical system unit 19B.
- the other split beam enters a second beam splitter (not shown) and is split into a measurement beam BM and a reference beam.
- the reference beam is reflected by the reflecting surface and reflected by, for example, the reflecting surface of the reticle stage RST, returns to the second beam splitter, is synthesized coaxially, and is output from the optical system unit 19B.
- the plane mirror 21 is fixed to a part of the body BD described above, for example, the reticle base 36 of the second column 34 or the lens barrel surface plate (main frame) 38 of the first column 32 described later. Has been.
- the sensor head 19A includes return lights from the first and second beam splitters in the optical system unit 19B (the measurement beams BM and BM described above and the respective reference beams).
- Combined light returns. Inside the sensor head 19A, these return lights enter the individual analyzers via the optical system, and the interference light output from each analyzer is individually received by the two photoelectric conversion elements. An interference signal corresponding to the interference light is sent to a signal processing system (not shown). This signal processing system detects that the phase change occurs due to the Doppler shift of the phase of the measurement beam with respect to the phase of the reference beam based on the interference signal from each photoelectric conversion element. Utilizing this, heterodyne detection of a change in the interference signal caused by the phase change is performed. Then, the signal processing system detects the change in the detected interference signal at the irradiation point of the measurement beams BM and BM.
- X position information of reticle stage RST at irradiation point 2 is always detected with a resolution of, for example, 0.5 to about Lnm.
- the reticle Y interferometer 16y is a Michelson type heterodyne laser interferometer that uses a two-frequency laser using the Zeeman effect as a light source in the same manner as the reticle X interferometer 16x.
- the reticle Y interferometer 16y is fixed to the reticle stage RST with the Y position of the reticle stage RST based on the fixed mirror 14 (see Fig. 1) fixed to the side surface of the lens barrel 40 constituting the projection unit PU.
- a movable mirror such as a plane mirror or a retroreflector
- always detect with a resolution of about Lnm a movable mirror (such as a plane mirror or a retroreflector) 15, for example, 0.5 to: Always detect with a resolution of about Lnm.
- at least a part of the reticle Y interferometer 16y (for example, an optical unit excluding the light source) is fixed to the reticle base 36, for example.
- the biaxial X position information from reticle X interferometer 16x and the Y position information from reticle Y interferometer 16y are sent to main controller 20 (see FIG. 6).
- the above-described reticle interferometer system includes an X interferometer 16x having a sensor head 19A and an optical system unit 19B provided on the reticle stage RST.
- the arrangement of the optical system unit 19B and the plane mirror 21 is reversed, that is, the reticle base 36 is arranged on a reflecting surface (corresponding to the plane mirror 21) formed on the side surface of the reticle stage RST in the Y-axis direction.
- a configuration may be adopted in which the measurement beam is irradiated from the optical system unit 19B.
- the sensor head 19A may be provided with a force provided on the reticle base 36, for example, at least a part thereof on a frame member different from the body BD.
- the above-described moving mirror 15 fixed to the end of the reticle stage RST is used as the interferometer reflecting surface of the reticle interferometer system.
- the reticle stage RST of the reticle stage RST is used.
- a reflective surface obtained by mirror-finishing the end surface (side surface) may be used.
- the force that Y interferometer 16y has one measuring axis and X interferometer 16x has two measuring axes.
- the number of measuring axes is X axis direction and Y axis direction. Or vice versa, or two or more each Also good.
- the Y interferometer 16y can measure the rotation information (pitching) of the reticle stage RST in the ⁇ X direction
- the X interferometer 16x can measure the rotation information (rolling) of the reticle stage RST in the 0 y direction.
- the measurement values of the reticle interferometer systems 16x and 16y are obtained by calibrating the measurement values of the encoders 26A, 26B, and 26C, which will be described later.
- the position of reticle stage RST is controlled based on the measurement value of the encoder system on the reticle side.
- the position of the reticle stage RST during scanning exposure is based on the measured values of encoders 26A, 26B, and 26C.
- controller 20 Managed by controller 20. Therefore, as can be easily imagined from FIG. 2, in the exposure operation, it is necessary to switch the encoder (connection of measured values) used for position control of the reticle stage RST, which will be described later. .
- an exposure wavelength for simultaneously detecting a pair of reference marks on the wafer stage WST and a corresponding pair of reticle marks on the reticle via the projection optical system PL is provided above the reticle stage RST.
- a pair of reticle alignment systems 13A and 13B (not shown in FIG. 1; see FIG. 6), which also has a TTR (Through The Reticle) type alignment system force using the same light, are provided at a predetermined distance in the X-axis direction.
- RU As the pair of reticle alignment systems 13 A and 13 B, for example, those having the same configuration as that disclosed in Japanese Patent Laid-Open No. 7-176468 (corresponding US Pat. No. 5,646,413) and the like are used. Can be used.
- Projection unit PU is held at a part of body BD below reticle stage RST in FIG.
- the body BD includes a first column 32 provided on a frame caster FC installed on the floor F of the clean room, and a second column 34 fixed on the first column 32.
- the frame caster FC includes a base plate BS placed horizontally on the floor surface F, and a plurality of, for example, three (or four) leg portions 39 (not shown in the figure) fixed on the base plate BS. The leg on the back side of the paper in 1 is not shown).
- the first column 32 is provided by a plurality of, for example, three (or four) first vibration isolation mechanisms 58 individually fixed to the upper ends of the plurality of legs 39 constituting the frame caster FC.
- a lens barrel surface plate (main frame) 38 supported substantially horizontally is provided.
- the lens barrel surface plate 38 is formed with a circular opening (not shown) at substantially the center thereof, and the projection unit PU is also inserted into the circular opening, and the projection unit PU is provided on the outer periphery thereof. It is held on the lens barrel surface plate 38 via the flange FLG.
- On the upper surface of the lens barrel surface plate 38 one end (lower end) of a plurality of legs 41 (for example, the legs on the back side of the paper in FIG.
- each of these legs 41 is provided at a position surrounding the projection unit PU. It is fixed.
- the other end (upper end) surface of each of these legs 41 is substantially on the same horizontal plane, and the above-mentioned reticle base 36 is fixed to these legs 41.
- the reticle base 36 is horizontally supported by the plurality of legs 41. That is, the second column 34 is constituted by the reticle base 36 and the plurality of legs 41 that support the reticle base 36.
- the reticle base 36 is formed with an opening 36a serving as a passage for the illumination light IL at the center thereof.
- Projection unit PU includes a lens barrel 40 that is cylindrical and provided with flange FLG, and a projection optical system PL that is formed of a plurality of optical elements held by lens barrel 40.
- the projection unit PU is placed on the lens barrel surface plate 38.
- the projection unit PU is disposed above the projection unit PU.
- the projection frame PU may be supported by hanging it against the main frame member of the lens or the reticle base 36! /.
- the projection optical system PL for example, a refractive optical system having a plurality of lens (lens element) forces arranged along the optical axis AX parallel to the Z-axis direction is used.
- the projection optical system PL is, for example, both-side telecentric and has a predetermined projection magnification (for example, 1Z4 times or 1Z5 times). For this reason, when the illumination area IAR is illuminated by the illumination light IL from the illumination system 10, the reticle (R1 or R2) in which the first surface (object surface) of the projection optical system PL and the pattern surface are substantially coincided with each other is arranged. ) Illuminated light IL that passes through the projection optical system PL through the projection optical system PL.
- Reduced image of the circuit pattern of the reticle in the illumination area I AR (a reduced image of a part of the circuit pattern). Its second surface (image plane) side The surface is formed in a region (exposure region) conjugated to the illumination region IAR on the wafer W having a surface coated with a resist (sensitizer).
- the reticle stage RST and wafer stage WST are driven synchronously to move the reticle relative to the illumination area IAR (illumination light IL) in the scanning direction (Y-axis direction) and to the exposure area (illumination light IL).
- the shot area (partition area) is scanned and exposed, and the reticle pattern is transferred to the shot area.
- a pattern is generated on the wafer W by the illumination system 10, the reticle, and the projection optical system PL, and the pattern is formed on the wafer W by exposure of the sensitive layer (resist layer) on the wafer W by the illumination light IL. It is formed.
- the wafer stage apparatus 12 includes a stage base 71 supported substantially horizontally by a plurality of (for example, three or four) second vibration isolation mechanisms (not shown) disposed on the base plate BS, A wafer stage WST disposed on the stage base 71, a wafer stage drive system 27 for driving the wafer stage WST, and the like are provided.
- the stage base 71 also serves as a plate-like member called a surface plate, and the upper surface thereof is finished with a very high flatness and serves as a guide surface for the movement of the wafer stage WST.
- Wafer stage WST has a main body part and an upper table part, and for example, a wafer stage drive system 27 including a linear motor, a voice coil motor, and the like, performs X-axis direction, Y-axis direction, and Z-axis direction. , 0x direction, 0y direction and 0z direction, driven in 6 degrees of freedom direction.
- a wafer stage drive system 27 including a linear motor, a voice coil motor, and the like, performs X-axis direction, Y-axis direction, and Z-axis direction. , 0x direction, 0y direction and 0z direction, driven in 6 degrees of freedom direction.
- wafer stage WST for example, a wafer stage body driven in at least the X axis direction, the Y axis direction, and the 0 z direction by a linear motor or the like, and at least Z on the wafer stage body by a voice coil motor or the like.
- a structure with a wafer table that is finely driven in the axial direction, 0 X direction, and 0 y direction may be adopted.
- wafer W On wafer stage WST (more precisely, on the table section), wafer W is placed via a wafer holder (not shown), and wafer W is, for example, vacuum chucked (or electrostatic chucked). ) Or the like.
- the position information in the XY plane (moving plane) of wafer stage WST includes the encoder system including head units 46B, 46C, 46D and moving scales 44B, 44C, 44D, etc. shown in FIG. And a wafer laser interferometer system (hereinafter referred to as a “wafer interferometer system”) 18.
- a wafer interferometer system hereinafter referred to as a “wafer interferometer system” 18.
- the configuration of the wafer stage WST encoder system and the wafer interferometer system 18 will be described in detail below.
- FIG. 3 On the upper surface of wafer stage WST, as shown in FIG. 3, four moving scales 44A to 44D surrounding wafer W are fixed. More specifically, the moving scales 44A-44D can generate the same material (eg ceramics or low thermal expansion glass) force. Thus, a reflection type diffraction grating whose longitudinal direction is the periodic direction is formed on the surface. This diffraction grating is formed with a pitch of 4 ⁇ m to 138 nm, for example, with a 1 ⁇ m pitch in this embodiment. In FIG. 3, for the sake of convenience of illustration, the pitch of the lattice is shown much wider than the actual pitch! The same applies to the other figures.
- the pitch of the lattice is shown much wider than the actual pitch! The same applies to the other figures.
- Moving scales 44A and 44C have a longitudinal direction that coincides with the Y-axis direction in FIG. 3 and passes through the center of wafer stage WST (considered by moving mirrors 17X and 17Y) and are parallel to the Y-axis direction.
- the diffraction gratings formed on the moving scales 44A and 44C are also symmetrically arranged with respect to the center line. These moving scales 44A and 44C are used for measuring the position of wafer stage WST in the Y-axis direction because the diffraction gratings are periodically arranged in the Y-axis direction.
- the moving scales 44B and 44D have the longitudinal direction coincident with the X-axis direction in FIG. 3, and pass through the center of the wafer stage WST (considered by moving mirrors 17X and 17Y) and are parallel to the X-axis direction.
- the diffraction gratings arranged symmetrically with respect to the center line and formed on the moving scales 44B and 44D are also symmetrical with respect to the center line.
- These movement scales 44B and 44D are used for measuring the position of the wafer stage WST in the X-axis direction because the diffraction gratings are periodically arranged in the X-axis direction.
- FIG. 1 the force that shows the state in which the wafer W is exposed above the moving scale 44C is shown in this manner for convenience.
- the moving scale 44A to 44D The upper surface is located at the same height as or above the upper surface of the wafer W! /.
- FIG. 1 and FIG. 3 four encoder head units (hereinafter abbreviated as “head units”) are shown surrounding the bottom end of the projection unit PU from four directions. 4) 6A to 46D are arranged to intersect with the corresponding moving scales 44A to 44D. Although these head units 46A to 46D are not shown in FIG. 1 from the viewpoint of avoiding complication of the drawing, they are actually fixed in a suspended state to the lens barrel surface plate 38 via a support member. Yes.
- the head units 46A and 46C have an X-axis direction orthogonal to the longitudinal direction (Y-axis direction in Fig. 3) of the corresponding moving scales 44A and 44C on the -X side and + X side of the projection unit PU, respectively. They are arranged in the longitudinal direction and symmetrically with respect to the optical axis AX of the projection optical system PL.
- the head units 46B and 46D have a Y-axis direction perpendicular to the longitudinal direction (X-axis direction in Fig. 3) of the corresponding moving scales 44B and 44D on the + Y side and -Y side of the projection unit PU, respectively. It is arranged symmetrically with respect to the optical axis AX of the projection optical system PL.
- Each of the head units 46A to 46D may have, for example, a single head or a plurality of heads arrayed substantially without breakage.
- the head unit 46C is represented in FIG. As shown specifically, it has a plurality of, for example, eleven heads 48a to 48k arranged at predetermined intervals along the longitudinal direction. It should be noted that the head units 46A to 46D are each diffracted with respect to an interval in which two adjacent heads do not deviate from the corresponding moving scale (diffraction grating), in other words, in a direction orthogonal to the longitudinal direction of the moving scale (arrangement direction of the diffraction grating). Multiple heads are arranged at intervals less than or equal to the width of the grid.
- the head unit 46A together with the moving scale 44A, measures the Y position of the wafer stage WST, and is a multi-lens, more precisely 11-eye Y linear encoder with heads 48a to 48k 5 OA (see Fig. 6) Configure.
- the head unit 46C together with the moving scale 44C, constitutes an 11-lens Y linear encoder 50C (see FIG. 6) that measures the Y position of the wafer stage WST.
- the head unit 46D together with the moving scale 44D, constitutes an 11-lens X linear encoder 50D (see FIG. 6) that measures the X position of the wafer stage WST.
- the measured values of the encoders 50A to 50D are supplied to the main controller 20.
- the exposure apparatus 100 shown in FIG. 1 is applied to the main frame member or the reticle base 36 as described above.
- the head units 46A to 46D may be suspended and supported integrally with the projection unit PU, or the main frame member is independent of the projection unit PU.
- four head units 46A to 46D may be provided on the measurement frame that is supported suspended from the reticle base 36!
- the position information of wafer stage WST is shown in FIG.
- the wafer interferometer system 18 that irradiates the measurement beam to the movable mirrors 17 and 43 fixed to the ST constantly detects, for example, with a resolution of about 0.5 to about Lnm.
- At least a part of the wafer interferometer system 18 (for example, an optical unit excluding the light source) is fixed to the lens barrel surface plate 38 in a suspended state. Note that at least a part of the wafer interferometer system 18 may be suspended and supported integrally with the projection unit PU, or may be provided on the above-described measurement frame.
- Y moving mirror 17Y having a reflecting surface orthogonal to the Y-axis direction that is the scanning direction and the non-scanning direction
- a force provided with an X moving mirror 17X having a reflecting surface orthogonal to the X-axis direction is shown as a moving mirror 17 in FIG.
- the wafer interferometer system 18 includes a wafer Y interferometer 18Y, two wafer X interferometers 18X and 18X, and five interferometers including two Z interferometers 18Z and 18Z.
- a Michelson-type heterodyne laser interferometer using a two-frequency laser using a laser is used.
- the Ueno and ⁇ interferometer 18Y is parallel to the optical axis ⁇ (center of the above-mentioned exposure area) of the projection optical system PL and the Y axis passing through the detection center of the alignment system ALG.
- a multi-axis interferometer having a plurality of measuring axes including two measuring axes that are symmetric with respect to a central axis (center axis) is used.
- Wafer X interferometer 18X passes along optical axis AX of projection optical system PL and has a measurement axis parallel to X axis.
- Shadow unit Measures the position information of the reflecting surface of the movable mirror 17X with reference to the reflecting surface of the X fixed mirror fixed to the side of the barrel 40 of the PU as the X position of the wafer stage WST.
- Wafer X interferometer 18X is a length measurement parallel to the X axis that passes through the detection center of alignment system ALG.
- the measurement beam is irradiated to the movable mirror 17X along the axis, and the position information of the reflective surface of the movable mirror 17X with reference to the reflective surface of the fixed mirror fixed to the side of the alignment ALG is used as the X position of the wafer stage WST. Measure as
- a movable mirror 43 having a longitudinal direction in the X-axis direction is provided on the side surface on the + Y side of the main body of wafer stage WST as a kinematic support (not shown).
- a pair of Z interferometers 18Z and 18Z that constitute part of the interferometer system 18 that irradiates the movable mirror 43 with a measurement beam facing the movable mirror 43 are provided (FIGS. 3 and 4)
- the movable mirror 43 is formed by integrating a rectangular shape whose length in the X-axis direction is longer than that of the movable mirror 17Y and an isosceles trapezoid. It is made of a member having a hexagonal cross-sectional shape. The surface of the movable mirror 43 on the + Y side is mirror-finished, and three reflecting surfaces 43b, 43a and 43c shown in FIG. 4 are formed!
- the reflecting surface 43a constitutes the + Y side end surface of the movable mirror 43, and extends in parallel to the XZ plane and in the X-axis direction.
- the reflecting surface 43b constitutes a surface adjacent to the + Z side of the reflecting surface 43a, and extends in the X-axis direction in parallel with the surface inclined in the clockwise direction in FIG. 4 by a predetermined angle with respect to the XZ plane.
- the reflecting surface 43c constitutes a surface adjacent to the ⁇ Z side of the reflecting surface 43a, and is provided symmetrically with the reflecting surface 43b with the reflecting surface 43a interposed therebetween.
- One side and the other side of the direction are arranged at substantially the same distance and slightly lower than Y interferometer 18Y.
- the fixed mirror 47A having a reflecting surface on which the measurement beam B1 reflected by the reflecting surface 43b is incident substantially perpendicularly, and the reflecting surface on which the measuring beam B2 reflected by the reflecting surface 43c is incident substantially perpendicularly are provided.
- Each fixed mirror 47B extends in the X-axis direction.
- the fixed mirrors 47A and 47B are supported by the same support (not shown) provided on the lens barrel surface plate 38, for example. Note that the fixed mirrors 47A and 47B may be supported by the above-described measurement frame or the like.
- the Y interferometer 18Y has the same distance from the straight line parallel to the Y axis passing through the projection center (optical axis AX, see Fig. 1) of the projection optical system PL. , Project the measurement beams B4 and B4 onto the moving mirror 17Y along the measurement axis in the Y-axis direction, which is away from the + X side,
- the position information in the axial direction is detected with reference to the reflecting surface of the Y fixed mirror fixed to the side surface of the barrel 40 of the projection unit PU.
- measurement beams B4 and B4 are typically measured. Shown as constant beam B4!
- the Y interferometer 18Y is positioned substantially at the center of the measurement beams B4 and B4 in plan view, and
- the beam B3 is projected toward the reflecting surface 43a of the fixed mirror 43, and the measurement beam B3 reflected by the reflecting surface 43a is received, whereby the Y axis of the reflecting surface 43a of the moving mirror 43 (that is, the wafer stage WS T) is received.
- the position information of the direction is detected.
- Main controller 20 measures the measurement axis corresponding to measurement beams B4 and B4 of Y interferometer 18Y.
- main controller 20 calculates the displacement (pitching amount) of wafer stage WST in the ⁇ X direction based on the position of eyelids on reflecting surface 43a of movable mirror 17Y and movable mirror 43.
- the Z interferometers 18Z and 18Z forces are projected onto the measurement beams Bl and B2, respectively.
- the light is incident on the reflective surfaces 43b and 43c of 43 at a predetermined incident angle ( ⁇ / 2), is reflected by the reflective surfaces 43b and 43c, and is perpendicularly incident on the reflective surfaces of the fixed mirrors 47A and 47B. Then, the measurement beams Bl and B2 reflected by the fixed mirrors 47A and 47B are again reflected by the reflecting surfaces 43b and 43c, respectively, and received by the Z interferometers 18Z and 18Z.
- optical path length change AL1 of the measurement beam B1 and the optical path length change AL2 of the measurement beam ⁇ 2 are expressed by the following equations (1) and (2), respectively.
- ⁇ and ⁇ can be obtained from the following formulas (3) and (4) from formulas (1) and (2).
- the displacement required by the interferometer 18Z is defined as AZoR and AYoR.
- the main controller 20 uses the above formulas (1) to (6) so that the interferometers 43 ⁇ , 43
- the displacements ⁇ ⁇ ⁇ ⁇ ⁇ , ⁇ , ⁇ , ⁇ y of four degrees of freedom of wafer stage WST can be calculated.
- main controller 20 determines that Y stage displacement ⁇ ⁇ of wafer stage WST and ⁇ stage displacement (pitch amount) of wafer stage WST based on the measurement result of Y interferometer 18Y. ) ⁇ ⁇ X can be obtained.
- 8 mm is typically shown as a wafer interferometer system 18 and is fixed for X-axis position measurement
- a mirror and a fixed mirror for axial position measurement are typically shown as a fixed mirror 57.
- the alignment ALG and the fixed mirror fixed to it are not shown in FIG.
- the wafer X interferometer 18X and the wafer ⁇ interferometer 18Y are used for calibration of the encoder system used during the wafer exposure operation, and the wafer X interferometer 18X and the wafer ⁇ interferometer Total 18Y is mark detection by alignment ALG
- the wafer interferometer 18Y can measure rotation information (pitching) in the ⁇ X direction in addition to the position of the wafer stage WST.
- the measurement interferometers 18X and 18X and ⁇ interferometer 18Y of the wafer interferometer system 18 described above are measured.
- the moving mirrors 17X and 17Y fixed to the stage and WST are used as the reflecting surface of the stage.
- the present invention is not limited to this.
- the end surface (side surface) of the wafer stage WST is mirrored to the reflecting surface (moving). (Equivalent to the reflective surface of mirrors 17 ⁇ and 17 ⁇ ).
- the measured value of 8cm is supplied to the main controller 20.
- the reference mark plate force (not shown) has its surface on the wafer. It is fixed at the same height as w. On the surface of this reference mark plate, there is at least a pair of reticle alignment first reference marks and a second reference for baseline measurement of the alignment ALG having a known positional relationship with respect to these first reference marks. Marks are formed.
- a force not shown in FIG. 1 is disclosed in, for example, Japanese Patent Laid-Open No. 6-283403 (corresponding US Pat. No. 5,448,332).
- An oblique incidence multi-point focal point position detection system consisting of an irradiation system 42a and a light receiving system 42b (see Fig. 6) is provided.
- the alignment system ALG (not shown in FIG. 1) is provided in the vicinity of the projection unit PU.
- this alignment system ALG for example, an image processing type alignment sensor, a so-called FIA (Field Image Alignment) system is used.
- the OFAXIS alignment method ALG supplies the main controller 20 with mark position information based on the index center. Based on the supplied information and the measured values of the interferometers 18Y and 18X of the wafer interferometer system 18, the main controller 20 detects the object to be detected.
- the mark specifically the second reference mark on the reference mark plate or the alignment mark on the wafer, on the coordinate system (alignment coordinate system) defined by the interferometers 18Y and 18X
- FIG. 5 one of the heads 48a to 48k (FIG. 3) of the head unit 46C that irradiates the moving light 44C with detection light is shown as a head 48y.
- the head 48y is roughly composed of three parts: an irradiation system 64a, an optical system 64b, and a light receiving system 64c.
- the irradiation system 64a emits a laser beam LB in a direction that forms 45 ° with respect to the Y axis and the Z axis, for example, a semiconductor laser LD, and the semiconductor laser LD force. And the lens L1 arranged in the.
- the optical system 64b includes a polarizing beam splitter PBS whose separation plane is parallel to the XZ plane, a pair of reflecting mirrors Rla, Rlb, lenses L2a, L2b, a quarter-wave plate (hereinafter referred to as a ⁇ 4 plate). Record WPla, WPlb, reflection mirrors R2a, R2b, etc.
- the light receiving system 64c includes a polarizer (analyzer), a photodetector, and the like.
- the laser beam LB emitted from the semiconductor laser LD enters the polarization beam splitter PBS via the lens L1, and is polarized and separated into two beams LB and LB.
- Polarizing beam splitter Beam transmitted through PBS LB is reflected mirror Rla
- the beam LB that has reached the reflective diffraction grating RG formed on the moving scale 44C and reflected by the polarization beam splitter PBS is reflected by the reflective mirror Rib.
- polarization separation means that the incident beam is separated into a P-polarized component and an S-polarized component.
- the first-order diffracted beams are converted into circularly polarized light by the ⁇ 4 plates WPlb and WPla through the lenses L2b and L2a, respectively, and then reflected by the reflecting mirrors R2b and R2a and pass again through the ⁇ 4 plates WPlb and WPla.
- the polarization beam splitter PBS is reached through the same optical path as the forward path in the opposite direction.
- Polarization Beam Splitter Each of the two beams that have reached PBS has its polarization direction rotated 90 degrees with respect to the original direction. For this reason, the first-order diffracted beam of beam LB that has previously passed through the polarizing beam splitter PBS is reflected by the polarizing beam splitter PBS and enters the light receiving system 64c.
- the beam passes through the polarizing beam splitter PBS and is coaxial with the first-order diffracted beam of beam LB.
- the two first-order diffracted beams are aligned in the polarization direction by the analyzer inside the light receiving system 64c, interfere with each other to become interference light, and this interference light is detected by the photodetector, It is converted into an electrical signal corresponding to the intensity of the interference light.
- the encoder 50C since the optical path lengths of the two beams to be interfered are extremely short and almost equal, the influence of the air fluctuation can be almost ignored.
- the moving scale 44C that is, the wafer stage WST
- the measurement direction in this case, the Y-axis direction
- the phase of each of the two beams changes and the intensity of the interference light changes.
- the change in the intensity of the interference light is detected by the light receiving system 64c, and the intensity change
- the position information is output as a measurement value of the encoder 50C.
- the other encoders 50A, 5OB, and 50D are configured in the same manner as the encoder 50C.
- the nine encoders 26A to 26C for the reticle stage described above also have a diffraction structure similar to that of the encoder 50C.
- Each encoder has a resolution of, for example,
- FIG. 6 a part of the control system related to the stage control of the exposure apparatus 100 of the present embodiment is omitted and shown in a block diagram.
- the control system in FIG. 6 includes a so-called microcomputer (or workstation) consisting of a CPU (central processing unit), ROM (read-only'memory), RAM (random access'memory), etc.
- the main controller 20 is configured to control the entire system.
- the position of the wafer stage WST is managed by the main controller 20 based on the measurement values of the wafer interferometer system 18 as described above.
- the position of wafer stage WST is managed by main controller 20 based on the measurement values of encoders 50A to 50D. Note that the position of the wafer stage WST may be managed based on the measurement values of the encoders 50A to 50D even during the wafer alignment operation.
- At least one measurement value of the wafer interferometer system 18 (for example, position information in the Z axis, ⁇ X, and ⁇ y directions) Can be used together.
- the position measurement system used for measuring the position of the wafer stage is the wafer interferometer system 18 (that is, the wafer Y interference) between the end of the wafer alignment operation and the start of exposure. 18Y and wafer X interferometer 18X) to encoders 50A to 50D
- the position of the wafer stage WST is controlled based on the measured values of the interferometers 18Y, 18X, 18Z, and 18Z. Managed by device 20. Therefore, after the wafer alignment is completed, the main controller 20 determines the wafer stay based on the measured values of these interferometers 18Y, 18X, 18Z, 18Z.
- the WST is driven in the + Y direction via the wafer stage drive system 27.
- the main controller 20 determines the wafer stage WST based on the measurement value of the interferometer 18Y. After adjusting the orientation of wafer stage WST so that the ⁇ z rotation error (chowing error) (and ⁇ X rotation error (pitching error)) is zero, the measured value of interferometer 18X is zero.
- Wafer stage WS Preset to the same value as the measured value of the interferometer 18X at that time.
- the ⁇ z rotation error of Ding can be adjusted based on the measured values of Z interferometers 18Z and 18Z.
- the main controller 20 is connected to the interferometer 18X.
- the main controller 20 uses the Y linear encoders 50A and 50C to calculate the average of the measured average values (average values during the stop time) of each of the multiple axes of the interferometer 18Y acquired during the stop time. This is taken over as the measured value.
- the preset operation of the X linear encoders 50B and 50D and the Y linear encoders 50A and 50C that is, the switching operation of the position measurement system is completed.
- the position of wafer stage WST is managed by main controller 20 based on the measurement values of encoders 50A to 50D.
- the main controller 20 includes, for example, a reticle by encoders 26A, 26B, and 26C.
- the main controller 20 uses the encoders 26 ⁇ , 26 ⁇ , and 26C to perform reticulation.
- reticle stage RST constant speed movement of reticle stage RST is started from the time point of FIG. 10, and exposure is started when a predetermined settling time has elapsed and the pattern area of reticle R1 reaches illumination area IAR. (See Figure 16). Further, after a predetermined time has elapsed, the exposure is finished (see FIG. 17), the reticle stage RST starts decelerating, and stops at the position shown in FIG. Note that deceleration of reticle stage RST may be started almost simultaneously with the end of exposure.
- main controller 20 it is managed by main controller 20 based on the measured values.
- the position of the reticle stage RST is measured by the interferometers 16x, 16y in addition to the encoder, and the state is shown!
- the interferometers 16x, 16y in addition to the encoder, and the state is shown!
- a method of using the measurement results of the encoder and interferometers 16x and 16y obtained during scanning exposure will be described later.
- the position of reticle stage RST is managed by main controller 20 based on the measurement values of encoders 26A, 26B, and 26C.
- main controller 20 manages not only the X and Y positions of reticle stage RST but also the position in the ⁇ z direction (showing) based on the measurement value of the encoder.
- reticle alignment systems 13A and 13B (FIG. 6), reference mark plate on wafer stage WST, alignment system ALG, and the like are used as in a normal scanning stepper.
- a series of operations such as reticle alignment (including the correspondence between reticle coordinate system and wafer coordinate system) and baseline measurement of alignment ALG are performed.
- the position control of reticle stage RST and wafer stage WST is performed by interferometers 16y and 16x, and interferometers 18X, 18X, 18Y, 18Z, and 18Z.
- main controller 20 performs wafer exchange on wafer stage WST (if there is no wafer on wafer stage WST) using a wafer loader (transport device) (not shown). For example, EG A wafer alignment is performed using alignment ALG for the wafer. By this wafer alignment, the arrangement coordinates of a plurality of shot areas on the wafer on the alignment coordinate system described above are obtained. [0150] After that, after the position control system is switched by the main controller 20, the position of the wafer stage WST is managed based on the previously measured baseline and the measured values of the encoders 50A to 50D. And the encoders 26A, 26B and 26C mentioned above
- a step-and-scan exposure is performed in the same procedure as a normal scanning 'stepper, and the pattern of the reticle (R1 or R2) Are respectively transferred to a plurality of shot areas on the wafer.
- FIG. 12 (A) shows a state where wafer stage WST is located near the center of wafer W directly below projection unit PU
- Fig. 12 (B) shows the center and outer periphery of wafer W.
- the wafer stage WST is shown at a position near the middle of the projection unit PU.
- FIG. 13 (A) shows a state where wafer stage WST is at a position where the vicinity of the + Y side edge of wafer W is directly below projection unit PU
- FIG. 13 (B) shows the state of wafer W.
- FIG. 14 shows a state where wafer stage WST is located at a position where the vicinity of the + X side edge of wafer W is directly below projection unit PU.
- FIG. 12 (A) to FIG. 14 in any of the drawings, at least one of the eleven heads (one or two in this embodiment) is present in each of the head units 46A to 46D. Therefore, the fact that it faces the corresponding moving scale is powerful.
- each of the four moving scales 44A to 44D described above has a length (corresponding to the formation range of the diffraction grating) in the longitudinal direction so that at least the entire surface of the wafer W is exposed. Covers the entire movement stroke (movement range) of wafer stage WST when light is emitted (in this embodiment, at least during scanning exposure and before and after scanning exposure, acceleration / deceleration and synchronous settling of wafer stage WST are performed. During the period, the size (diameter) of the wafer W so that the four head units 46A to 46D (measurement beams) do not deviate from the corresponding moving scales (diffraction gratings)! ) Is set longer than!
- each of the four head units 46A to 46D has a length (corresponding to a detection range of the diffraction grating) in the longitudinal direction of at least the entire surface of the wafer W by scanning exposure. Cover the entire movement stroke (ie, at least during the exposure operation of wafer W, the four head units 46A to 46D (measurement beams) do not deviate from the corresponding movement scales (diffraction gratings), that is, they cannot be measured). It is set to be equal to or greater than the moving stroke.
- other operations such as alignment operation (including wafer alignment and baseline measurement described above) can be used to measure the position of wafer stage WST using encoders 50A to 50D. You can configure 46D! / ⁇ .
- the moving scale of the encoder shifts its fixed position with the passage of time of use, or the pitch of the diffraction grating changes partially or entirely due to thermal expansion, etc., so the encoder lacks long-term stability. . For this reason, the error included in the measured value increases with the passage of time of use, and it is necessary to calibrate it.
- an encoder calibration operation performed by the exposure apparatus 100 of the present embodiment will be described.
- This first calibration operation for correcting the gain error and the linearity error of the measurement values of the encoder constituting the reticle stage encoder system will be described.
- This first calibration operation is performed before, for example, the exposure of the first wafer for each lot, that is, performed at a relatively long interval, and is hereinafter also referred to as a long-term calibration operation.
- illumination area IAR passes through reticles R1 and R2 (pattern area) (actually, reticles R1 and R2 (pattern area) traverse illumination area IAR). )
- the illumination area IAR is not illuminated with the illumination light IL, but here, in order to explain the movement position of the reticle stage RST in an easily understandable manner, Use a phrase such as “Area IAR passes”.
- main controller 20 performs measurement at reticle ⁇ interferometer 16y and ⁇ linear encoders 26 ⁇ and 26B, and reticle X interferometer 16 at a predetermined sampling interval.
- Map 1 as shown in Fig.15.
- the measurement values of the three encoders 26A, 26B, and 26C are captured by the reticle R1 and R2 (patterns).
- Fig. 15 is a diagram showing the relationship between the measured value of the interferometer on the horizontal axis and the measured value of the encoder on the vertical axis as curve C, and the difference between this curve C and the ideal line TL. Indicates the error included in the measured value of the encoder.
- the diagram in FIG. 15 can be used as a correction map for correcting the measurement value of the encoder as it is. The reason is that, for example, the point P1 in FIG. 15 indicates that when the measured value of the encoder is el, the measured value of the corresponding interferometer is il.
- the force that is obtained when scanning the reticle stage RST at low speed, as well as long-term fluctuation errors as well as short-term fluctuation errors due to air fluctuations, are considered to be accurate values that can be ignored. This is because there is no problem.
- the correction map for correcting the measurement value of 1 is that the reticle stage RST is driven within the movable range in the X-axis direction, and the measurement values of the encoder 26C and reticle X interferometer 16x obtained during the drive are obtained.
- the measurement values of the encoder 26C and reticle X interferometer 16x obtained during the drive are obtained.
- it may be created based on the above.
- the main controller 20 also uses the encoders 26A and 26B described above for the remaining encoders.
- the curve C of the correction map is represented by the offset component and the low-order component of the gradient component, Separated into other high-order components, each low-order component and high-order component are stored as correction maps. You may have a correction map with a high-order component. Or, we have a correction map (correction information) for high-order components that are expected to not change over a relatively long period of time. Low-order component correction information may be acquired by a short-term calibration operation.
- the reticle stage RST In the calibration operation for acquiring (determining) the reticle stage RST is moved in the scanning direction (Y-axis direction) over the range where the pattern areas of the reticles R1 and R2 cross the illumination area IAR as described above.
- the movement range of force reticle stage RST is not limited to this.
- the moving range during the strike exposure may be a moving range of the reticle stage RST including at least a part of the acceleration / deceleration period and the synchronous settling period before and after the scanning exposure period alone.
- the movement range of reticle stage RST is the movement range during measurement operation using a reference mark (not shown) provided on reticle stage RST, which is limited to the movement range of reticle stage RST during scanning exposure using reticles Rl and R2. May also be included. At least one reference mark is provided on the reticle stage RST on the Y side with respect to the reticle R1 and on the + Y side with respect to Z or the reticle R2.
- encoders 26A, 26B, and 26 are performed, for example, for each wafer (so-called overhead time (until the exposure end power of the previous wafer and the start of exposure of the next wafer)).
- c gain error scaling error of encoder measurement value to interferometer measurement value
- the second calibration operation to be corrected will be described. Since this second calibration operation is performed for each wafer or the like, that is, at a relatively short interval, it is hereinafter also referred to as a short-term calibration operation.
- main controller 20 determines that the Y-side end of the pattern area of reticle R1 (or R2) used for the next exposure is in the scanning direction (Y-axis direction).
- Position reticle stage RST at the first Y position that coincides with the + Y side end of illumination area IAR (hereinafter also referred to simply as the first position).
- the illumination area IAR is not actually illuminated with the illumination light IL.
- the illumination area IAR is illustrated in order to make it easy to split the position of the reticle stage RST. Has been.
- main controller 20 continues the positioning state of reticle stage RST at the first position shown in FIG. 16 for a predetermined time, and encoders 26A, 26B and 26C, and Interferometer 16x, 16y measurement value during predetermined sampling
- main controller 20 drives reticle stage RST in the Y direction so that the edge on the + Y side of the pattern area of reticle R1 (or R2) moves as shown in FIG.
- Reticle stage RST is positioned at the second Y position (hereinafter also simply referred to as the second position) that coincides with the Y side edge of illumination area IAR.
- main controller 20 continues the positioning state of reticle stage RST at the second position shown in FIG. 17 for a predetermined time, and encoders 26A, 26B and 26C and the interference are maintained during the positioning state.
- Measurement values are acquired at predetermined sampling intervals and stored in a memory (not shown).
- main controller 20 determines whether encoders 26A, 26B and 26C and interferometers 16x and 16y are based on the measurement values (information) stored in the memory at the first and second positions, respectively.
- the average value (time average value) of the measured values at the first and second positions is calculated. Based on the calculation result, the measured values of the Y linear encoders 26 A and 26B, the measured value of the reticle Y interferometer 16y, and the reticle X interferometer 16x
- point P2 point P3 force This is the point that shows the relationship between the measured values of the interferometer and the corresponding encoder's measured values, in which short-term fluctuations due to air fluctuations at each of the two positions are reduced by the averaging effect.
- main controller 20 calculates an inclination component (scaling) S of a correction map for correcting the encoder measurement value using the interferometer measurement value by the following equation.
- main controller 20 replaces the calculated slope component of the correction map with the slope component in the low-order component correction map, and has the low-order component correction map after the replacement as a correction map. Based on the high-order components, a new correction map for correcting the low-order components and the high-order components is created.
- the reticle stage RST is moved between the first position and the second position, which are positions at both ends of the range in which the illumination area IAR passes through the pattern area of the reticle R1 (or R2) to be exposed.
- the new correction information is calculated by positioning at two locations and performing predetermined processing.
- the present invention is not limited to this, and in addition to the first position and the second position, the reticle stage RST is positioned at three or more positions including at least one position between these positions. It is also possible to calculate the least square approximation line of three or more points obtained and calculate the offset component in addition to the slope component (scaling error) of the correction map based on the approximation line.
- the low-order component and the high-order component are corrected based on the low-order component (slope component and offset component) of the calculated correction map and the high-order component held as the correction map!
- a new correction map can be created for this purpose.
- the first and second positions for positioning the reticle stage RST are forces corresponding to both ends of the movement range of the reticle stage RST for the entire reticle pattern area to cross the illumination area IAR in the scanning direction. Not limited to, for example, corresponding to the range in which reticle stage RST is actually moved during scanning exposure using either reticle R1 or R2 (moving range including acceleration / deceleration period before and after scanning exposure and synchronous settling period) It is good to do.
- the movement range in the scanning direction defined by the first and second positions may be at least partially deviated from the movement range of the reticle stage RST for the entire pattern area of the reticle to cross the illumination area IAR. But It is preferable that at least the movement range is included. Further, the movement range of reticle stage RST may include the movement range during the measurement operation using the reference mark described above.
- the gain error of encoders 26A, 26B, and 26C (scale of the encoder measurement value relative to the interferometer measurement value), which is performed for each wafer (so-called over-the-head time), is performed.
- the main controller 20 performs the next exposure at a low speed that can maintain the throughput within the allowable range.
- Reticle stage RST is driven in the Y-axis direction within a predetermined range in which illumination area IAR passes through the pattern area of reticle R1 (or R2) to be used.
- interferometers 16x, 16y and encoder 26A are driven in the Y-axis direction within a predetermined range in which illumination area IAR passes through the pattern area of reticle R1 (or R2) to be used.
- the position information of the kur stage RST is acquired at a predetermined sampling interval and stored in a memory (not shown).
- the illumination area IAR is not illuminated with the illumination light IL, but the expression “the illumination area IAR passes” is used for the same reason as described above.
- the movement range of reticle stage RST is the same as the range described in the second calibration operation described above. However, in this third calibration operation, it is not necessary to position reticle stage RST at both ends of the moving range.
- the main controller 20 uses the Y linear encoders 26A and 26B.
- symbol EA indicates a predetermined range in which the illumination area IAR passes through the pattern area of the reticle R1 (or R2), that is, an exposure section.
- main controller 20 obtains a least-squares approximate straight line FL of the curve C1, and obtains an offset drift OD and a scaling drift SD with respect to the ideal straight line TL of this approximate straight line FL.
- the calculated offset drift (offset error) and scaling drift (tilt error) The low-order component correction map previously stored as a map is updated. Then, based on the corrected low-order component correction map and the high-order component correction map previously stored as a map! /, A new one for correcting low-order components and high-order components Create a correct correction map.
- the movement range of reticle stage RST in the third calibration operation is at least partially deviated from the predetermined range (corresponding to exposure section EA) for the entire reticle pattern area to cross illumination area IAR.
- the range in which reticle stage RST is actually moved during scanning exposure using one of reticles Rl and R2 acceleration and deceleration periods before and after scanning exposure and The range of movement including the synchronous settling period may be used.
- the movement range of reticle stage RST may include the movement range during the measurement operation using the reference mark described above.
- the long-term calibration operation and short-term calibration operation power of the encoders 50A to 50D used for position control of the wafer stage WST during the exposure operation are performed by the main controller 20 described above.
- the movement of wafer stage WST is performed in a two-dimensional plane. In this case, on the Cartesian coordinate system defined by Wafer Y Interferometer 18Y and Wafer X Interferometer 18X.
- a correction map based on the error distribution of the measurement values of the X linear encoders 50B and 50D and a correction map based on the error distribution of the measurement values of the Y linear encoders 50A and 50C are obtained.
- the arrangement direction and the longitudinal direction of the diffraction gratings of the moving scales 44A and 44C are both the Y-axis direction, and the longitudinal direction (head arrangement direction) of the head units 46A and 46C is X. Axial direction.
- the long-term calibration operation (first calibration operation) of the encoders 50A to 50D performed in the exposure apparatus 100 of the present embodiment that is, the correction information of the grating pitch of the moving scale of the wafer stage WST and the grating deformation
- the correction information acquisition operation will be described with reference to FIG.
- measurement beams B4 and B4 from Y interferometer 18Y are projected optical system PL.
- Y interferometer 18Y can measure the Y position of wafer stage WST without Abbe error.
- the measurement beam from the X interferometer 18X force is the light from the projection optical system PL.
- the X position of the wafer stage WST can be measured without any Abbe error during exposure.
- main controller 20 includes Y interferometer 18Y, X interferometer 18X, and ⁇ interferometers 18Z, 18Z.
- Wafer stage WST based on the measured value of 2, and move scales 44A and 44C are directly below corresponding head units 46A and 46C (at least one head) as shown in Fig. 20.
- Wafer stage WST is positioned at a position where the + and ⁇ side ends of moving scales (diffraction gratings) 44A and 44C coincide with corresponding head units 46A and 46C, respectively.
- main controller 20 operates ⁇ interferometer 18Y while fixing the measured value of X interferometer 18X to a predetermined value at a low speed at which short-term fluctuations in the measured value of ⁇ interferometer 18Y can be ignored.
- the main controller 20 moves the moving scale 44, which is arranged so as to face the head units 46 ⁇ and 46 C sequentially with the movement of the wafer stage WST.
- the lattice pitch correction information can be obtained, for example, as a correction map in which the horizontal axis is the measured value of the interferometer and the vertical axis is the measured value of the encoder, a curve indicating the relationship between the two.
- the measurement value of the Y interferometer 18Y is obtained when the wafer stage WST is scanned at the above-mentioned extremely low speed, so long-term fluctuation errors as well as short-term fluctuations caused by air fluctuations, etc. Therefore, it can be considered as an accurate value that can be ignored.
- wafer stage WST is driven in the Y-axis direction over a range where both ends of moving scales 44A and 44C cross corresponding head units 46A and 46C. Wafer stage WST may be driven within the range in the Y-axis direction in which wafer stage WST is moved.
- the main controller 20 is capable of obtaining a plurality of head forces of the head units 46B and 46D that are sequentially opposed to the movement scales 44B and 44D during the movement of the wafer stage WST.
- the correction information on the deformation (bending) of the lattice lines that sequentially face the heads is also obtained. Looking for. If the reflecting surface of the movable mirror 17X is an ideal plane, the same blur pattern appears repeatedly in the process of sending the wafer stage WST in the + Y direction. This is because, if the obtained measurement data is averaged, the correction information of the deformation (bending) of the lattice lines of the moving scales 44B and 44D that sequentially face the plurality of heads can be obtained accurately.
- the unevenness (bending) of the reflecting surface is measured in advance to obtain correction data for the bending.
- the measured value of the X interferometer 18X is set to the predetermined value.
- the X linear encoders 50B and 50D are Y linear in the arrangement direction and the longitudinal direction of the diffraction gratings of the moving scales 44B and 44D, and the longitudinal direction (head arrangement direction) of the head units 46B and 46D. Since the encoders 50A and 50C are just opposite to the X-axis and Y-axis directions, the correction information for Y-scale grid line deformation (grid line bending) and the grid pitch correction information for moving scales 50B and 50D are obtained. In the operation (first calibration operation), it is only necessary to perform the above-described correction and processing in which the X-axis direction and the Y-axis direction are interchanged, so detailed description will be omitted.
- the main controller 20 determines the correction information of the grid pitch of the moving scales 44A and 44C and the deformation (bending) of the grid lines of the moving scales 44B and 44D at every predetermined timing, for example, for each lot. Correction information, and grid pitch correction information of moving scales 44B and 44D and correction information of deformation (bending) of grid lines of moving scales 44A and 44C are obtained.
- the main controller 20 uses the moving unit 44A and 46C to obtain the measured values (that is, the measured values of the encoders 50A and 50C) as the moving scale 44A.
- the position of wafer stage WST in the Y-axis direction is controlled while correcting based on the correction information of lattice pitch of 44C and the correction information of deformation (bending) of lattice line. This makes it possible to control the position of the wafer stage WST in the Y-axis direction using linear encoders 50A and 50C that are not affected by changes in the grating pitch over time of the moving scales 44A and 44C and the curvature S of the grating lines. It becomes possible to carry out with high accuracy.
- the main controller 20 uses the moving values to measure the measured values obtained by the head units 46B and 46D (that is, the measured values of the encoders 50B and 50D).
- the position of the wafer stage WST in the X-axis direction is controlled while correcting based on the correction information of the lattice pitch of 44B and 44D and the correction information of deformation (bending) of the lattice line.
- the grid pitch of the moving scales 44B and 44D changes with time and the bending of the grid lines.
- the position control of the wafer stage WST in the X-axis direction can be performed with high accuracy.
- the correction information of the lattice pitch and the lattice line bend is obtained for any of the movement scales 44A to 44D.
- the present invention is not limited to this, and the movement scale 44A,
- the correction information for the lattice pitch and the lattice line bending may be acquired only for either 44C or moving scale 44B, 44D, or the lattice pitch, for both moving scale 44A, 44C and moving scale 44B, 44D, You can get only the correction information for any of the grid line bends!
- the main controller 20 performs a recording based on the measured values of the encoders 26A, 26B, 26C and the correction map thereof.
- the position control of the wafer stage RST is performed, and the position control of the wafer stage WST is performed based on the measurement values of the encoders 50A to 50D and the correction map thereof.
- main controller 20 performs a total of encoders 26A, 26B, and 26C that perform reticle replacement operation on reticle stage RST by performing reticle alignment on reticle R1 and reticle R2.
- double exposure can be performed by using reticle R1 and reticle R2 only by moving reticle stage RST based on the measured value.
- the encoders used in the present embodiment are not limited to the diffraction interference method described above, and various methods such as a so-called pickup method can be used.
- a so-called pickup method can be used.
- US Pat. No. 6,639 A so-called scan encoder disclosed in the 686 specification and the like can be used.
- the main controller 20 performs calibration operations such as encoders 26A, 26B, and 26C. sand In other words, compared with encoders 26A, 26 ⁇ , 26C, etc.
- main controller 20 drives reticle stage RST based on the measurement values of encoders 26A, 26B, and 26C and the correction information during scanning exposure or the like.
- the reticle stage RST can be driven with high accuracy based on the position information of the reticle stage R ST which has good linearity and long-term stability as well as short-term stability.
- the above-described long-term calibration is an interference that provides superior linearity and long-term stability of measured values compared to the encoders 26A and 26B.
- correction information for correcting the measured values of the encoders 26A and 26B which is superior in short-term stability of the measured values compared to the interferometer 16y, is acquired. And main control
- the device 20 uses the measured values of the encoders 26A and 26B and the correction information during pattern transfer.
- the movement of reticle stage RST in the scanning direction can be accurately controlled based on position information of reticle stage RST in the scanning direction with good tee and long-term stability.
- Correction information for correcting differences, or scaling errors and scaling offsets is obtained.
- the main controller 20 then uses the encoders 26A, 26 during pattern transfer.
- main controller 20 performs, for example, the calibration operation of encoders 50A to 50D in the same manner as the calibration operation of encoders 26A and 26B described above.
- the encoder has superior short-term stability of measured values compared to the interferometers 18Y and 18X.
- Correction information is obtained to correct the measured values of A to 50D using the measured values of interferometers 18Y and 18X, which have superior linearity and long-term stability of measured values compared to encoders 50A to 50D.
- main controller 20 drives wafer stage WST based on the measurement values of encoders 50A to 50D and the correction information during scanning exposure and step movement between shot areas.
- the measurement values of encoders 50A to 50D corrected using the correction information that is, the positional information regarding the X-axis and Y-axis directions of wafer stage WST with good linearity and long-term stability as well as short-term stability. Based on this !, the wafer stage WST can be driven with high precision in either the X-axis or Y-axis direction.
- the main controller 20 includes the encoders 26A, 26B, 26C, and the encoder 50 at the time of scanning exposure for each shot area on the wafer.
- reticle R1 or R2 reticle stage RST
- wafer W wafer stage WST
- highly accurate positioning between reticle R1 or R2 (reticle stage RST) and Ueno, W (wafer stage WST) in the non-scanning direction (X-axis direction) is also possible.
- the pattern of the reticle R1 (or R2) can be accurately formed in a plurality of shot areas on the wafer W.
- main controller 20 corrects the measurement values of the encoder based on the measurement values of the encoder and interferometer obtained by moving reticle stage RST separately from the exposure operation.
- the correction information may be updated using the measurement values of the encoder and interferometer obtained during movement of reticle stage RST during the exposure operation. That is, when performing a step-and-scan exposure operation that sequentially transfers the pattern of the reticle R1 (or R2) to a plurality of shot areas on the wafer W, for example, during the scanning exposure of each shot area, the reticle stage RST Is controlled based on the measured value of the encoder and its correction information.
- the measurement values of the interferometer and encoder are accumulated, and based on this accumulated measurement value, correction information (for example, the interferometer It is also possible to perform sequential calibration of encoder measurement error, which calibrates the map information indicating the relationship between the measurement value and the encoder measurement value).
- the symbol C2 indicates the average value of the accumulated data, and this average value data indicates short-term fluctuations in the interferometer measurement values (measurement value fluctuations due to air fluctuations, etc.). Averaged. In this case, it is not necessary to accumulate data during scanning exposure for all shot areas. It is sufficient to accumulate data during scanning exposure for a number of shot areas sufficient to average short-term fluctuations in interferometer measurement values.
- reference numeral EA denotes an exposure section similar to that in FIG.
- the movement of the reticle stage RST at the time of scanning exposure (pattern transfer) of each shot area is corrected information (for example, The encoder measurement values corrected using the map information in Fig. 21), that is, based on reticle stage position information with good linearity and long-term stability as well as short-term stability, can be controlled with high accuracy.
- the pattern formed on the reticle R1 (or R2) can be accurately transferred to a plurality of shot areas on the wafer by scanning exposure.
- This calibration may be performed not only on the Y linear encoder but also on the X linear encoder, and may also be performed on the wafer stage encoder system (encoders 50A to 50D).
- the correction information of the grating pitch of the moving scale and the correction information of the bending of the grating line may be acquired by a method according to a modification described below.
- main controller 20 fixes the Y interference while fixing the measured value of X interferometer 18X to a predetermined value.
- main controller 20 captures the measurement values of encoders 50A and 50C and the measurement value of Y interferometer 18Y (measurement values by measurement beams B4 and B4) into the internal memory at a predetermined sampling interval.
- the measurement value of the encoder 50C is circled in FIG. 22 at a distance a in the + X direction from the straight line LV parallel to the Y axis passing through the optical axis of the projection optical system PL facing the moving scale 44C. It is obtained from the head 48k of the head unit 46C shown in a box.
- the measured value of encoder 5 OA is obtained from the head 48e of the head unit 46A shown in a circle in FIG. 22 at a distance b in the X direction from the straight line LV facing the moving scale 44A. .
- main controller 20 determines the wafer stage WST based on the measurement value of X interferometer 18X!
- main controller 20 fixes the Y interference while fixing the measurement value of X interferometer 18X to a predetermined value.
- the wafer stage WST is moved in the + Y direction indicated by arrow F in FIG.
- the main controller 20 stores the measurement values of the encoders 50A and 50C and the measurement value of the Y interferometer 18Y (measurement values by the measurement beams B4 and B4) in the internal memory at a predetermined sampling interval.
- the measured value of the encoder 50C is from the head 48e of the head unit 46C shown in a circle in FIG. 23 at a distance b in the + X direction from the straight line LV facing the moving scale 44C. can get.
- the measurement value of the encoder 50A is obtained from the head 48k of the head unit 46A shown in a circle in FIG. 23 at a distance a in the X direction from the straight line LV, facing the moving scale 44A.
- the reflecting surface of the movable mirror 17X is not an ideal plane, the reflecting surface Unevenness (bending) is measured and correction data for the bending is obtained.
- the wafer stage WST shown in FIGS. 22 and 23 is moved in the + Y direction, the X interferometer 18X
- the wafer stage WST may be accurately moved in the Y-axis direction by controlling the X position of the wafer stage WST based on the correction data.
- the main control device 20 After obtaining correction information (for example, correction maps) of the grid pitches of the moving scales 44A and 44C as described above, the main control device 20 performs, for example, as shown in FIG. Move WST in the + Y direction using the same procedure as in Figure 22 above.
- the head unit 46B shown in a circle in FIG. 24 is opposed to the moving scales 44B and 44D, respectively.
- the head 48i of the head 48g and head unit 46D is out of the axial force of the X interferometer 18X. Because of this, the interferometer
- the effect of the apparent bowing amount of the wafer stage WST to be measured is an error (hereinafter abbreviated as error due to bearing) as encoder 50B and 50D (head 48g of head unit 46B and head 48i of head unit 46D). It will be included in the measured value. However, in this case, using encoders 50A and 50C (opposite moving scales 44A and 44C, respectively, head unit 46A head 48h and head unit 46C head 48h shown in circles in FIG. 24) It is possible to measure the apparent amount of wafer stage WST measured by the interferometer due to the above-mentioned air fluctuation.
- the main control device 20 corrects the measurement values of the encoders 50A and 50C using the correction information of the grid pitch of the moving scales 44C and 44A obtained previously, and based on the corrected measurement values.
- the apparent winging amount of the wafer stage WST described above can be obtained.
- main controller 20 can correct the above-mentioned error due to the jowing using the obtained apparent caming amount.
- Main controller 20 is a head that is disposed in sequence with moving scales 44B and 44D while correcting the error due to bowing while moving wafer stage WST in the + Y direction. Measured values that can be obtained for multiple head forces of units 46B and 46D are loaded into the internal memory at a predetermined sampling interval. The main controller 20 is the same as described above. For this reason, the measurement values taken into the internal memory are statistically processed, for example, averaged (or weighted averaged), so that correction information on the deformation (bending) of the grid lines of the moving scales 44B and 44D is also obtained.
- the wafer stage WST is driven in the Y direction indicated by the arrow F 'in FIGS. 22, 23 and 24 to correct the lattice pitch of the moving scales 44A and 44C.
- the same processing as described above may be performed to obtain information (for example, a correction map) and correction information for deformation (bending) of the lattice lines of Z or moving scales 44B and 44D.
- the main controller 20 when acquiring the correction information of the deformation (bending) of the lattice lines of the moving scales 44A and 44C and the correction information of the lattice pitch of the moving scales 44B and 44D, the main controller 20 In this case, the X axis direction and the Y axis direction are interchanged, but this detailed description is omitted.
- each scale (diffraction grating) has a width, with respect to the width direction, for example, along the three lines at the center of the left and right, the above-mentioned grating pitch correction information is obtained. It is sufficient to take a typical grid line and measure the bend. This is preferable in terms of accuracy and workability.
- the wafer stage WST is obtained when acquiring the correction information of the scale lattice pitch and the correction information of the Z or scale lattice line deformation (grid line bending). Since it is not always necessary to move the at a very low speed, it is possible to obtain the correction information in a short time.
- FIGS. 25 and 26 differ from FIG. 3 only in the configuration of the encoder system, and in the following, components having the same or equivalent functions and functions as those in FIG. Omitted.
- two moving scales 52A and 52 B are formed in a longitudinal direction, the longitudinal directions of which are orthogonal to each other and the longitudinal directions are the Y-axis and X-axis directions, respectively. It is fixed to.
- the two moving scales 52A and 52B have reflection type diffraction gratings having a periodic direction in a direction perpendicular to the longitudinal direction on the surface.
- the head unit 46A and the pair of head units 46B and 46B correspond to each other.
- the moving scales 52A and 52B are arranged so as to intersect with each other and are fixed to the lens barrel surface plate 38 in a suspended state via a support member (not shown).
- the head unit 46A passes through the optical axis AX of the projection optical system PL, with the X-axis direction (period direction of the diffraction grating) orthogonal to the longitudinal direction (Y-axis direction) of the moving scale 52A as the longitudinal direction (head arrangement direction).
- the X linear encoder 56A that is arranged on the axis (center axis) parallel to the X axis and that measures the position information of the wafer stage WST in the X axis direction together with the moving scale 52A is configured.
- the pair of head units 46B and 46B are each in the Y-axis direction (diffraction) perpendicular to the longitudinal direction (X-axis direction) of the moving scale 52B.
- Configure Y linear encoder 56B that measures two position information of WST in the Y-axis direction.
- the measured values of the two linear encoders 56A and 56B are supplied to the main controller 20, and the main controller 20 is based on the position information in the X-axis and Y-axis directions and the rotation information in the ⁇ z direction.
- Wafer stage drive system 27 is used to control the position of wafer stage WST. As a result, the two-dimensional driving of the wafer stage WST with high accuracy is possible just as in the above embodiment.
- FIG. 26 is a diagram showing another variation of the encoder system for the wafer stage.
- the difference from FIG. 25 is that another set of linear encoders 56A and 56B is different from the one set of linear encoders 56A and 56B described above. This is only the point where encoders 56C and 56D are provided.
- two moving scales 52C and 52D are fixed to the upper surface of wafer stage WST in the form of two moving scales 52C and 52D having longitudinal directions orthogonal to each other and having the Y-axis and X-axis directions as longitudinal directions, respectively. ing.
- the two moving scales 52C and 52D have a reflection type diffraction grating whose periodic direction is perpendicular to the longitudinal direction on the surface, and are arranged symmetrically with the moving scales 52A and 52B with respect to the center of the wafer stage WST. ing.
- the head unit 46C and the pair of head units 46D and 46D correspond to each other.
- the movable scales 52C and 52D are arranged so as to intersect with each other, and are fixed to the lens barrel surface plate 38 in a suspended state via a support member (not shown).
- the head unit 46C has an X-axis direction (period direction of the diffraction grating) orthogonal to the longitudinal direction (Y-axis direction) of the moving scale 52C (the head direction of the diffraction grating). Is arranged symmetrically with respect to the optical axis AX of the projection optical system PL with respect to the head unit 46A described above (that is, arranged on an axis (central axis) parallel to the X axis passing through the optical axis AX described above).
- the X linear encoder 56C that measures the position information of the wafer stage WST in the X-axis direction is configured together with the moving scale 52C.
- the pair of head units 46D and 46D are each in the Y-axis direction (diffraction) perpendicular to the longitudinal direction (X-axis direction) of the moving scale 52D.
- the periodic direction of the grating is the longitudinal direction (head arrangement direction), and it is arranged symmetrically with the aforementioned head units 46B and 46B with respect to the optical axis AX of the projection optical system PL (that is, the aforementioned light
- Y linear encoder 56D that measures two position information in the Y-axis direction of wafer stage WST along with moving scale 52D, as well as moving scale 52D.
- the measured values of the four linear encoders 56A to 56D are supplied to the main controller 20, and the main controller 20 is based on the position information in the X-axis and Y-axis directions and the rotation information in the ⁇ z direction.
- Wafer stage drive system 27 is used to control the position of wafer stage WST.
- the encoder system of FIG. 26 has four linear encoders 56A to 56D, the exposure of the wafer can be performed without arranging the head unit closer to the projection optical system PL than the encoder system of FIG.
- the position information of the wafer stage WST is always obtained from at least three of the four linear encoders 56A to 56D (position information in the X-axis and Y-axis directions and rotation information in the ⁇ z direction). Can be obtained.
- the encoder system of FIG. 26 is not limited to the force in which each of the Y linear encoders 56B and 56D has two head units.
- the encoder system may have only one head unit.
- the aforementioned wafer X interferometer 18X includes a length measuring axis (corresponding to a solid line in the figure) that coincides with an axis (center axis) parallel to the X axis passing through the optical axis AX of the projection optical system PL. Has at least one measuring axis.
- the X linear encoder 56A (and 56C) has the measurement axis (head arrangement direction) of the head unit 46A (and 46C) as its center axis (the wafer X interferometer 18X). It is arranged in line with the measurement axis in X measurement.
- the above-mentioned wafer Y interferometer 18Y is provided with the optical axis AX and the optical axis of the projection optical system PL.
- Multiple measurement systems including two measurement axes (corresponding to the solid lines in Figs. 25 and 26, corresponding to beams ⁇ 4 and ⁇ 4) that are symmetric with respect to an axis parallel to the Y axis (center axis) that passes through the detection center of the ligament system ALG axis
- ⁇ Linear encoder 56 ⁇ (and 56D) has a head unit 46 ⁇ , 46 ⁇ (and 46D, 46D) measuring axis (head arrangement direction) and the two measuring axes respectively.
- the linear encoder and the wafer interferometer Arranged to match. This makes it difficult for the linear encoder and the wafer interferometer, where the measurement axis and measurement axis described above match, to have a difference in measurement values, and the calibration operation described above can be performed with high accuracy. It becomes.
- the measurement axis of the linear encoder and the measurement axis of the wafer interferometer are made to coincide with each other.
- the present invention is not limited to this, and both axes may be shifted in the XY plane. This also applies to the above embodiment (FIG. 3).
- two or four moving scales (52A to 52D) also have the same material (for example, ceramics or low thermal expansion glass) force
- the length (corresponding to the width of the diffraction grating) covers at least the entire movement stroke (movement range) of the wafer stage WST during the exposure operation of the wafer W (in other words, scanning exposure of all shot areas). It is set longer than the size (diameter) of the wafer W so that sometimes each headpiece (measurement beam) does not deviate from the corresponding moving scale (diffraction grating)!
- each of the three or six head units (46A to 46D) is, for example, a single head or a plurality of heads that are arranged substantially seamlessly.
- the encoder system shown in FIG. 25 and FIG. 26 has a plurality of heads arranged at predetermined intervals along the longitudinal direction.
- each head unit has the same diffraction grating formation range as the distance between two adjacent heads from the corresponding moving scale (diffraction grating), that is, the direction perpendicular to the longitudinal direction of the moving scale (diffraction grating arrangement direction).
- a plurality of heads are arranged at intervals of less than about.
- 3 or 6 head units (46A-46D) are each long
- the length (corresponding to the detection range of the diffraction grating) covers at least the entire movement stroke (movement range) of the wafer stage WST during the exposure operation of the wafer W (in other words, all shot areas).
- Each head unit (measurement beam) during scanning exposure So that it does not deviate from the corresponding movement scale (diffraction grating), that is, measurement is impossible).
- each encoder is performed in the same manner as the exposure apparatus 100 (including the encoder system shown in FIG. 3) of the above embodiment.
- a calibration operation for determining value correction information (the first to third calibration operations described above) is performed.
- the position of the moving scale in the longitudinal direction is set so that one end thereof coincides with the corresponding head unit, and then the moving in the diffraction grating arrangement direction (direction orthogonal to the longitudinal direction). Move the scale more than the same distance as its width.
- the moving scale in the longitudinal direction by a distance equivalent to the size of the measurement beam in one head of the head unit, similarly, moving the moving scale in the same direction as the width of the diffraction grating in the arrangement direction. Move more than the distance. Thereafter, the above operation is repeated until the other end of the moving scale matches the head unit. Then, based on the measurement value of the encoder obtained by this driving and the wafer interferometer whose measurement direction is the same as that of the encoder, correction information for the encoder may be determined.
- the force that drives the wafer stage WST over a range where both ends of the moving scale coincide with the corresponding head unit in the longitudinal direction is not limited to this.
- the wafer stage WST Wafer stage WST may be driven in the range of the longitudinal direction to be moved
- the position of reticle stage RST and wafer stage WST is determined using only the above encoder system (FIGS. 2, 3, 25, and 26) during the wafer exposure operation. Control was to be performed. However, even if the above-mentioned (especially short-term) calibration operation is performed, for some reason (for example, the attachment of a foreign object to the moving scale, the displacement of the moving scale, the head unit falling or its telecentric collapse, If the moving scale that exceeds the range is displaced in the Z direction (direction perpendicular to the surface, etc.), the position measurement becomes impossible, or the measurement accuracy exceeds the allowable range.
- a first drive mode that uses position information measured by the encoder system described above and a second drive mode that uses position information measured by the interferometer system described above are prepared.
- 1 Set the drive mode to be used during the exposure operation. If at least part of the position information in the X-axis and Y-axis directions and the rotation information in the ⁇ z direction necessary for position control cannot be obtained during exposure operations, for example, the first drive mode is changed to the second drive mode. It is preferable to control the position of the reticle stage or Ueno / stage by switching to.
- a third drive mode is also prepared in which at least a part of the position information measured by the encoder system and at least a part of the position information measured by the interferometer system are used together.
- the position of the reticle stage or wafer stage may be controlled using one of the second and third drive modes.
- switching from the first drive mode to the second drive mode (or the third drive mode) is not limited to the exposure operation, but is also performed in other operations (for example, measurement operations such as alignment). May be performed. In other operations, it is not necessary to set the first drive mode in advance. Instead of the first drive mode, another drive mode (for example, one of the second and third drive modes) may be set. . In this case, if an error occurs during stage position control in another drive mode, switch to another drive mode (for example, the other of the second and third drive modes or the first drive mode).
- any drive mode other than the exposure operation may be selected.
- the position information of the fiducial mark on the wafer stage WST is measured by the reticle alignment system and the encoder system. Based on the position information, the position of the wafer stage by the encoder system is measured. Position control may be performed.
- the present invention is not limited to this.
- the alignment system ALG is installed at a position where the projection unit PU force is sufficiently distant, the same as the head units 46A to 46D described above also in the area where the alignment operation using the alignment system ALG is performed.
- the head unit is arranged in a cross shape around the alignment ALG.
- the movement scales 44A to 44D have their respective origins, and in the case of wafer alignment such as EGA, the origin of the coordinate system defined by the combination of these movement scales 44A to 44D (ie, movement The position information of each alignment mark on the wafer W with reference to the point defined by the origin of scale 44A to 44D) is detected using the head unit and moving scale 44A to 44D, and based on the detection result Then, a predetermined calculation may be performed to obtain relative position information of each shot area with respect to the origin. In this case, at the time of exposure, the origin is detected using the encoders 50A to 50D, and each shot area is accelerated for exposure using the relative position information of each shot area with respect to the origin. It can be moved to the start position. In this case, the position drift between the head, the projection unit PU, and the alignment system ALG is also an error factor.
- the above-described encoder system (Figs. 2, 3, 25, and 26) is used during the wafer exposure operation to perform the reticulation stage RST and wafer stage WST.
- Force for position control Stage position control using an encoder system In addition to the exposure operation that is not limited to the exposure operation only, for example, the reticle alignment mark or reticle stage RST reference mark detection operation by the reticle alignment system or the reticle replacement operation is also shown in FIG.
- the position control of reticle stage RST may be performed using an encoder system.
- the wafer stage WST is used by using the encoder system shown in FIGS. Position control may be performed. In this case, naturally, the switching operation of the position measurement system described above is not necessary.
- the encoder system described above is used when the alignment mark on the wafer W or the reference mark of the wafer stage WST is detected by the alignment ALG, or when the reference mark of the wafer stage WST is detected by the reticle alignment system.
- the encoder system described above is used when the alignment mark on the wafer W or the reference mark of the wafer stage WST is detected by the alignment ALG, or when the reference mark of the wafer stage WST is detected by the reticle alignment system.
- Fig. 3, Fig. 25, Fig. 26 it is preferable to consider the movement range of wafer stage WST during this detection operation.
- each head unit 46A to 46D, 46A to 46D
- the arrangement of each head unit is such that the position measurement by the encoder system becomes impossible and the position control of the wafer stage is not cut off. It is preferable to set a length or the like, or to provide a head unit different from these head units.
- the position of each wafer stage can be controlled using the above-mentioned encoder system (Fig. 3, Fig. 25, Fig. 26), even with a twin wafer stage type exposure system that can perform detection in parallel with other devices. It is.
- each head unit is appropriately set in the arrangement, length, etc., so that each encoder unit (FIGS. 3, 25, 26) can be used as it is.
- a head unit that can be used during the measurement operation is installed.
- each wafer stage is adjusted by these head units and the corresponding moving scales (46 A to 46 D, 52 A to 52 D) during the above measurement operation.
- two or four moving scales (Fig. 3, Fig. 25, Fig. 26) are provided on each of the two wafer stages, and the exposure operation of the wafer placed on one of the wafer stages is performed.
- the other wafer stage on which the next wafer on which the mark is detected at the measurement position is placed at the exposure position by exchanging with one of the wafers and the stage.
- the measurement operation performed in parallel with the exposure operation is not limited to the detection of a mark such as a wafer by an alignment system. Instead of or in combination with it, for example, wafer surface information (step information, etc.) Detection or the like may be performed.
- the measurement position or the exchange position is the exposure position.
- the wafer stage position control using the encoder system is cut during the movement of the wafer stage to another position, a measurement device that is different from the encoder system (for example, using an interferometer, encoder, etc.), it is preferable to control the position of the wafer stage during each of the above positions or movements! /.
- Measuring member (reference mark, The measurement stage is placed directly under the projection optical system PL by exchanging with the wafer stage at the time of wafer exchange operation, etc., and the characteristics of the exposure apparatus (for example, imaging of the projection optical system) It is also possible to measure characteristics (such as wavefront aberration) and polarization characteristics of illumination light IL.
- a moving scale may be arranged on the measurement stage, and the position control of the measurement stage may be performed using the encoder system described above.
- the measurement stage is retracted to a predetermined position that does not interfere with the wafer stage, and is moved between this retracted position and the exposure position. For this reason, even at the retracted position or while moving from one of the retracted position and the exposure position to the other, as with the wafer stage, the moving range of the measurement stage is taken into account, and position measurement by the encoder system is performed. It is preferable to set the arrangement and length of each head unit, or to provide a head unit different from those head units so that the position control of the measurement stage is not cut off due to the failure of the head.
- the position control of the measurement stage by the encoder system is cut off at the retracted position or during the movement, the position control of the measurement stage is performed using a measurement device (for example, an interferometer, an encoder, etc.) other than the encoder system. It is preferable to carry out.
- a measurement device for example, an interferometer, an encoder, etc.
- the distance between the pair of head units extending in the same direction must be increased.
- one of the pair of head units may deviate from the corresponding moving scale force.
- the head unit 46B out of the pair of head units 46B and 46D can deviate from the corresponding moving scale 44B.
- WO99Z49504 pamphlet, WO2004Z053955 pamphlet (corresponding US Patent Application Publication No. 2005Z0252506), US Patent No.
- the encoder system (particularly the head unit) may be configured so that one position information can be measured. That is, in the position control of the wafer stage (or measurement stage) by the encoder system, it is not always necessary to use a total of four pieces of position information, two each in the X-axis and Y-axis directions.
- the liquid repellent plate WRP on the upper surface of the wafer stage WST (or the wafer table WTB) is made of glass and a scale pattern is directly provided on the glass. good.
- the wafer table may be made of glass.
- a liquid repellent film is formed on the surface of the moving scale. It is preferable to keep it.
- wafer stage WST In consideration of the reduction in size and weight of wafer stage WST, it is preferable to place the moving scale as close as possible to wafer W on wafer stage WST, but it is allowed to enlarge the wafer stage. In some cases, the wafer stage is enlarged and the distance between a pair of moving scales arranged opposite to each other is widened, so that at least during each wafer exposure operation, there are always four positions, two each in the X-axis and Y-axis directions. Information may be measurable.
- a moving scale is provided so that a part of the moving scale protrudes from the wafer stage, or an auxiliary plate provided with at least one moving scale is used to move outside the wafer stage main body.
- the head unit tilts (tilt relative to the Z-axis direction), the arrangement of heads in the XY plane (position or spacing, etc.), or It is preferable to measure the telecentric tilt of the head and use this measurement result in the position control. Furthermore, for example, the displacement or tilt amount of the moving scale in the Z-axis direction (direction perpendicular to the surface) is measured, and this measurement result is used in the position control. It is preferable.
- the first to third calibration operations of the encoder described in the above embodiments and modifications, and the above sequential calibration operations may be executed alone or in appropriate combination.
- the force for moving the stage at a low speed during position measurement by the encoder system and the interferometer system in the calibration operation described above is not limited to this, and the stage may be moved at the same speed as in scanning exposure as described above. .
- the force for controlling the position of the reticle stage, the wafer, and the stage using the encoder system is not limited to this.
- one of the reticle stage and the wafer stage uses the encoder system. While position control is performed, position control using an interferometer system may be performed on the other stage.
- the encoder head unit may be disposed below the force reticle stage, in which the encoder head unit is disposed above the reticle stage. In this case, the moving scale is also provided on the lower surface side of the reticle stage.
- each of the plurality of moving scales is, for example, a suction chuck such as a vacuum chuck.
- a suction chuck such as a vacuum chuck.
- the present invention is not limited to this.
- a screw or a diffraction grating may be directly formed on the wafer stage.
- the diffraction grating may be formed on the table on which the wafer holder is formed, or on the liquid repellent plate particularly in an immersion type exposure apparatus.
- the materials that form the diffraction grating are made of low thermal expansion materials such as ceramics (eg, Schott). Preferably, it is made up of manufactured zerodure or the like.
- a coating may be applied to the surface so as to cover at least the diffraction grating, or a cover glass may be provided.
- each moving scale has a diffraction grating formed continuously over almost the entire longitudinal direction. For example, a plurality of diffraction gratings are used. It may be formed intermittently by dividing it into regions, or each moving scale may be duplicated. It may be composed of several scales.
- the pair of moving scales 44A and 44C used for measuring the position in the Y-axis direction and the position in the X-axis direction A pair of moving scales 44B, 44D and force used on the wafer stage WST.
- a pair of head units 46A and 46C are placed on one side and the other side of the projection optical system PL in the X-axis direction.
- the case where the pair of head units 46B and 46D are arranged on one side and the other side in the Y-axis direction of the projection optical system PL is illustrated.
- the present invention is not limited to this, and at least one of the moving scales 44A and 44C for measuring the position in the Y-axis direction and the moving scales 44B and 44D for measuring the position in the X-axis direction is not a pair but only one. Alternatively, at least one of the pair of head units 46A, 46C and the pair of head units 46B, 46D may be provided instead of the pair.
- the extending direction of the moving scale and the extending direction of the head unit are not limited to orthogonal directions such as the X-axis direction and the Y-axis direction of the above-described embodiment.
- the configuration of the wafer interferometer system 18 is not limited to that shown in Fig. 3.
- the wafer interferometer system 18 X interferometer 18X does not have to be provided, and wafer X interference
- the total 18X is composed of, for example, a multi-axis interferometer similar to the wafer Y interferometer 18Y.
- wafer Y interferometer 18Y is one axis.
- a multi-axis interferometer may be capable of measuring only winging as rotation information.
- wafer X interferometer 18X or wafer Y interferometer 18Y can store rotation information.
- the wafer interferometer system 18 of the present embodiment only needs to be able to measure at least position information in the X-axis and Y-axis directions and rotation information in the ⁇ z direction (showing) during the wafer exposure operation.
- the present invention is not limited to this, and the present invention is applied to a stationary exposure apparatus such as a stepper. Also good. Even in the case of a stepper, etc., the position of the stage on which the object to be exposed is mounted is measured by an encoder, which is different from the case where the position of the stage is measured using an interferometer. The generation of errors can be made almost zero.
- the stage can be positioned with high accuracy based on correction information for correcting short-term fluctuations in encoder measurement values using interferometer measurement values and encoder measurement values.
- the reticle pattern can be transferred onto the object.
- the present invention can also be applied to a step-and-stitch reduction projection exposure apparatus, a proximity exposure apparatus, or a mirror projection aligner that synthesizes a shot area and a shot area.
- the magnification of the projection optical system in the exposure apparatus of the above embodiment may be not only a reduction system, but also an equal magnification and an enlargement system
- the projection optical system PL is not only a refraction system but also a reflection system and catadioptric refraction.
- the system may be displaced, and the projected image may be an inverted image or an upright image.
- the exposure area irradiated with the illumination light IL via the projection optical system PL is an on-axis area including the optical axis AX within the field of the projection optical system PL. For example, it is disclosed in International Publication No. 2004Z107011.
- an optical system (a reflection system or a reflex system) that has a plurality of reflection surfaces and forms an intermediate image at least once is provided in a part thereof, and has a single optical axis.
- the exposure region may be an ophaxis region that does not include the optical axis AX.
- the illumination area and the exposure area are rectangular in shape, but the shape is not limited to this. For example, an arc, a trapezoid, or a parallelogram may be used.
- the illumination light IL is not limited to ArF excimer laser light (wavelength 193 nm), but also ultraviolet light such as KrF excimer laser light (wavelength 248 nm) or vacuum such as F laser light (wavelength 157 nm).
- It may be ultraviolet light.
- vacuum ultraviolet light for example, as disclosed in International Publication No. 1999Z46835 pamphlet (corresponding US Pat. No. 7,023,610), a DFB semiconductor laser or fiber laser force is oscillated in the infrared or visible region.
- a single wavelength laser beam may be amplified by a fiber amplifier doped with erbium (or both erbium and ytterbium), and a harmonic wave converted into ultraviolet light using a nonlinear optical crystal may be used.
- the illumination light IL of the exposure apparatus is not limited to light having a wavelength of lOOnm or more, and light having a wavelength of less than lOOnm may be used.
- EUV Extreme Ultraviolet
- SOR or plasma laser as a light source
- the exposure wavelength An EUV exposure system using an all-reflection reduction optical system designed under (for example, 13.5 nm) and a reflective mask is being developed.
- the present invention can be suitably applied to a powerful apparatus.
- the present invention can also be applied to an exposure apparatus that uses a charged particle beam such as an electron beam or an ion beam.
- a light transmission type mask in which a predetermined light shielding pattern (or phase pattern, dimming pattern) is formed on a light transmissive substrate is used.
- this reticle instead of this reticle, as disclosed in, for example, US Pat. No. 6,778,257, based on the electronic data of the pattern to be exposed, the transmission pattern or the reflection pattern, or the light emission pattern Electronic masks (also called variable-shaped masks, active masks, or image generators) that form the image, such as DMD (Digital Micro-mirror Device), a type of non-light emitting image display device (also called a spatial light modulator), etc. May be used).
- DMD Digital Micro-mirror Device
- a type of non-light emitting image display device also called a spatial light modulator
- the stage force on which the wafer or glass plate is mounted is scanned, so the stage position is measured using an encoder, and the encoder is measured.
- an exposure apparatus (lithography system) that forms line 'and' space pattern on wafer W by forming interference fringes on wafer W. ) Can also be applied to the present invention.
- JP-T-2004-519850 corresponding to US Pat. No. 6,611,316
- two reticle patterns are passed through a double-headed projection optical system.
- the present invention can also be applied to an exposure apparatus that combines on a wafer and performs double exposure almost simultaneously on one shot area on the wafer by one scan exposure.
- the apparatus for forming a pattern on an object is not limited to the exposure apparatus (lithography system) described above, and the present invention can be applied to an apparatus for forming a pattern on an object by, for example, an ink jet method.
- the object (the object to be exposed to which the energy beam is irradiated) in which the pattern is to be formed in the above embodiment and the modification is not limited to the wafer, but a glass plate, a ceramic substrate, a mask blank, or Other objects such as a film member may be used.
- the shape of the object is not limited to a circle but may be other shapes such as a rectangle.
- the use of the exposure apparatus is not limited to the exposure apparatus for semiconductor manufacturing, for example, an exposure apparatus for liquid crystal that transfers a liquid crystal display element pattern to a square glass plate, or an organic EL, a thin film magnetic head, It can be widely applied to exposure devices for manufacturing image sensors (CCDs, etc.), micromachines, DNA chips, etc.
- image sensors CCDs, etc.
- micromachines micromachines
- glass substrates, silicon wafers, etc. are used to manufacture reticles or masks used in light exposure equipment, EUV exposure equipment, X-ray exposure equipment, electron beam exposure equipment, etc. that can be used only with micro devices such as semiconductor devices.
- the present invention can also be applied to an exposure apparatus that transfers a circuit pattern.
- the present invention is not limited to the exposure apparatus, but may be a substrate processing apparatus (for example, a laser repair apparatus, a substrate inspection apparatus, etc.), a sample positioning apparatus, a wire bonding apparatus, etc. in other precision machines.
- the present invention can be widely applied to apparatuses equipped with a moving stage.
- a semiconductor device has a step of designing a function / performance of the device, a step of manufacturing a reticle based on this design step, a step of manufacturing a wafer from a silicon material,
- the exposure apparatus is manufactured through a lithography step for transferring a pattern formed on a mask onto a photosensitive object, a device assembly step (including a dicing process, a bonding process, a knocking process), an inspection step, and the like.
- Risodara Since the exposure apparatus of the above embodiment is used in the step, a highly integrated device can be manufactured with a high yield.
- the exposure apparatus includes various subsystems including the respective constituent elements recited in the claims of the present application, with predetermined mechanical accuracy, electrical accuracy, optical Manufactured by assembling so as to maintain accuracy.
- various optical systems are adjusted to achieve optical accuracy
- various mechanical systems are adjusted to achieve mechanical accuracy
- various electrical systems are thus, adjustments are made to achieve electrical accuracy.
- the assembly process to the exposure system includes mechanical connections, electrical circuit wiring connections, and pneumatic circuit piping connections between the various subsystems. It goes without saying that there is an assembly process for each subsystem before the assembly process from these various subsystems to the exposure system. When the assembly process of the various subsystems to the exposure apparatus is completed, comprehensive adjustment is performed to ensure various accuracies for the exposure apparatus as a whole. It is desirable to manufacture the exposure apparatus in a clean room where the temperature and cleanliness are controlled. Industrial applicability
- the moving body driving method and the moving body driving system of the present invention are suitable for driving a moving body with high accuracy.
- the pattern forming method and the pattern forming apparatus of the present invention are suitable for pattern formation on an object.
- the exposure method and exposure apparatus of the present invention are suitable for exposing an object and forming a pattern on the object.
- the device manufacturing method of the present invention is suitable for manufacturing micro devices.
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Abstract
Description
Claims
Priority Applications (17)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16197278.1A EP3147710B1 (en) | 2006-01-19 | 2007-01-19 | Exposure apparatus, exposure method, and device manufacturing method |
KR1020147035844A KR101634894B1 (ko) | 2006-01-19 | 2007-01-19 | 이동체 구동 방법 및 이동체 구동 시스템, 패턴 형성 방법 및 패턴 형성 장치, 노광 방법 및 노광 장치, 그리고 디바이스 제조 방법 |
KR1020147007479A KR101477468B1 (ko) | 2006-01-19 | 2007-01-19 | 이동체 구동 방법 및 이동체 구동 시스템, 패턴 형성 방법 및 패턴 형성 장치, 노광 방법 및 노광 장치, 그리고 디바이스 제조 방법 |
EP07707109.0A EP1983555B1 (en) | 2006-01-19 | 2007-01-19 | Movable body drive method, movable body drive system, pattern formation method, pattern forming apparatus, exposure method, exposure apparatus and device manufacturing method |
KR1020087011530A KR101323565B1 (ko) | 2006-01-19 | 2007-01-19 | 이동체 구동 방법 및 이동체 구동 시스템, 패턴 형성 방법및 패턴 형성 장치, 노광 방법 및 노광 장치, 그리고디바이스 제조 방법 |
KR1020177025717A KR101889245B1 (ko) | 2006-01-19 | 2007-01-19 | 이동체 구동 방법 및 이동체 구동 시스템, 패턴 형성 방법 및 패턴 형성 장치, 노광 방법 및 노광 장치, 그리고 디바이스 제조 방법 |
KR1020187022756A KR20180091963A (ko) | 2006-01-19 | 2007-01-19 | 이동체 구동 방법 및 이동체 구동 시스템, 패턴 형성 방법 및 패턴 형성 장치, 노광 방법 및 노광 장치, 그리고 디바이스 제조 방법 |
CN2007800012740A CN101356623B (zh) | 2006-01-19 | 2007-01-19 | 移动体驱动方法及移动体驱动系统、图案形成方法及图案形成装置、曝光方法及曝光装置、以及元件制造方法 |
KR1020147023870A KR101525373B1 (ko) | 2006-01-19 | 2007-01-19 | 이동체 구동 방법 및 이동체 구동 시스템, 패턴 형성 방법 및 패턴 형성 장치, 노광 방법 및 노광 장치, 그리고 디바이스 제조 방법 |
JP2007554984A JPWO2007083758A1 (ja) | 2006-01-19 | 2007-01-19 | 移動体駆動方法及び移動体駆動システム、パターン形成方法及びパターン形成装置、露光方法及び露光装置、並びにデバイス製造方法 |
KR1020127003449A KR101278829B1 (ko) | 2006-01-19 | 2007-01-19 | 이동체 구동 방법 및 이동체 구동 시스템, 패턴 형성 방법 및 패턴 형성 장치, 노광 방법 및 노광 장치, 그리고 디바이스 제조 방법 |
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KR1020157021182A KR101780574B1 (ko) | 2006-01-19 | 2007-01-19 | 이동체 구동 방법 및 이동체 구동 시스템, 패턴 형성 방법 및 패턴 형성 장치, 노광 방법 및 노광 장치, 그리고 디바이스 제조 방법 |
IL192783A IL192783A (en) | 2006-01-19 | 2008-07-13 | Movable body drive method, movable body drive system, pattern formation method, pattern formation device, exposure method, exposure device and device fabrication method |
IL218916A IL218916A0 (en) | 2006-01-19 | 2012-03-28 | Movable body drive method, moving body drive system, pattern formation method, pattern formation device, exposure method, exposure device and device fabrication method |
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