WO2006025302A1 - 露光装置、動作決定方法、基板処理システム及びメンテナンス管理方法、並びにデバイス製造方法 - Google Patents
露光装置、動作決定方法、基板処理システム及びメンテナンス管理方法、並びにデバイス製造方法 Download PDFInfo
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- WO2006025302A1 WO2006025302A1 PCT/JP2005/015628 JP2005015628W WO2006025302A1 WO 2006025302 A1 WO2006025302 A1 WO 2006025302A1 JP 2005015628 W JP2005015628 W JP 2005015628W WO 2006025302 A1 WO2006025302 A1 WO 2006025302A1
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- maintenance
- substrate processing
- wafer
- exposure apparatus
- exposure
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
- G03F7/70491—Information management, e.g. software; Active and passive control, e.g. details of controlling exposure processes or exposure tool monitoring processes
- G03F7/70525—Controlling normal operating mode, e.g. matching different apparatus, remote control or prediction of failure
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/70975—Assembly, maintenance, transport or storage of apparatus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67155—Apparatus for manufacturing or treating in a plurality of work-stations
- H01L21/67207—Apparatus for manufacturing or treating in a plurality of work-stations comprising a chamber adapted to a particular process
- H01L21/67225—Apparatus for manufacturing or treating in a plurality of work-stations comprising a chamber adapted to a particular process comprising at least one lithography chamber
Definitions
- Exposure apparatus operation determination method, substrate processing system, maintenance management method, and device manufacturing method
- the present invention relates to an exposure apparatus, an operation determination method, a substrate processing system, a maintenance management method, and a device manufacturing method. More specifically, the exposure apparatus connected inline to a substrate processing apparatus, and the exposure apparatus Operation determining method for determining the operation of the substrate, a substrate processing system comprising an exposure apparatus and a substrate processing apparatus connected inline to the exposure apparatus, and a maintenance management method for managing maintenance of each apparatus in the substrate processing system And a device manufacturing method using the exposure apparatus and system.
- a substrate such as a wafer or a glass plate (hereinafter referred to as “weha”) is generally used using an exposure apparatus.
- a resist coating process for coating a resist on the surface of the wafer and a development process for developing an exposed wafer are included before and after the exposure process.
- CZD is, for example, a spin coater that drops a resist onto the wafer while rotating the wafer at a high speed and applies the resist uniformly on the wafer surface using the rotation of the wafer, or a scan coater that relatively moves the nozzle and wafer. Combines the functions of a resist coating device with the functions of a developing device!
- in-line 'lithography system a system in which the above-described exposure apparatus and CZD are connected in-line. It can be said that it is difficult. The reason is that in an inline lithography system, if the C ZD is shut down due to regular maintenance, parts replacement, or other reasons, the exposure tool must also be shut down, reducing the operating rate of the exposure tool. This is because it is clearly more than the exposure apparatus alone.
- the present invention has been made under strong circumstances, and the first object of the present invention is to improve the operation rate without deteriorating the performance of the apparatus when connected in-line to the substrate processing apparatus.
- An object of the present invention is to provide an exposure apparatus capable of performing [0010]
- a second object of the present invention is to provide an operation determination method capable of improving the operating rate without degrading the apparatus performance when the exposure apparatus is connected in-line to the substrate processing apparatus. is there.
- a third object of the present invention is to provide a substrate processing system capable of improving the operating rate while maintaining the performance of the system.
- a fourth object of the present invention is to provide a maintenance management method capable of improving the operating rate while maintaining system performance.
- a fifth object of the present invention is to provide a device manufacturing method capable of improving the productivity of a highly accurate device.
- the exposure apparatus is connected in-line to the substrate processing apparatus, and determines the operation of the apparatus based on information relating to maintenance of the substrate processing apparatus force.
- An exposure apparatus includes an operation determining device.
- the exposure apparatus since the exposure apparatus includes the operation determining device that determines the operation of the own device based on the information related to the maintenance from the substrate processing device, the operation determining device includes the substrate processing apparatus.
- the operation determining device includes the substrate processing apparatus.
- the exposure apparatus downtime required to perform the specific operation (which is also the substrate processing apparatus downtime) can be reduced as a whole, which enables inline connection to the substrate processing apparatus. Therefore, it is possible to improve the operating rate without deteriorating the performance of the exposed exposure apparatus.
- the operation of the own apparatus determined by the operation determining apparatus includes not only the operation performed by the exposure apparatus itself, but also the operation performed by notifying the operator and the like. included.
- the information related to the maintenance from the substrate processing apparatus includes information related to the content of the maintenance work performed in the substrate processing apparatus, and the operation determination device is responsive to the content of the maintenance work. To determine the behavior of Can. Further, the information related to the maintenance of the substrate processing apparatus includes information related to the time required for the maintenance work performed in the substrate processing apparatus, and the operation determining apparatus is based on the time required for the maintenance work. The operation of the device itself can be determined.
- the determined operation of the device itself may include maintenance work.
- the operation determining apparatus may determine to perform the maintenance work of the apparatus in parallel with at least a part of the maintenance work of the substrate processing apparatus. Monkey.
- the maintenance work of the own apparatus may include a maintenance work of the laser device that is an exposure light source. It is possible to include work without exposure of the substrate, or to include parts replacement work.
- an operation determination method for determining an operation in an exposure apparatus connected in-line to a substrate processing apparatus, and obtaining information on maintenance from the substrate processing apparatus A step of determining the operation of the exposure apparatus based on the information.
- the operation of the exposure apparatus is determined based on the information on the maintenance of the substrate processing apparatus force, the performance of the exposure apparatus is maintained in parallel with the maintenance of the substrate processing apparatus. It is possible to decide to perform the necessary actions. As a result, the downtime of the exposure apparatus can be reduced as a whole, which can improve the operating rate without degrading the apparatus performance of the exposure apparatus connected inline to the substrate processing apparatus. Become.
- the operation of the exposure apparatus includes not only work performed by the exposure apparatus itself but also work performed by the operator informing the operator or the like.
- a substrate processing system including an exposure apparatus and a substrate processing apparatus connected inline to the exposure apparatus, the maintenance work of the exposure apparatus. And maintenance management that cooperates with maintenance work of the substrate processing apparatus A substrate processing system including the apparatus.
- the substrate processing system power is provided with a maintenance management device that performs the maintenance operation of the exposure apparatus and the maintenance operation of the substrate processing apparatus in a coordinated manner. For this reason, the maintenance work for the exposure apparatus and the maintenance work for the substrate processing apparatus are performed in parallel at the same time as much as possible. Thus, by optimizing the maintenance timing, it is possible to improve the operating rate without degrading the performance of the substrate processing system.
- maintenance work includes not only work performed by the exposure apparatus itself, but also work performed by the operator informing the operator or the like.
- the maintenance management apparatus can be either a control computer provided in the exposure apparatus or a control computer provided in the substrate processing apparatus,
- the maintenance management apparatus may be a computer commonly connected to the exposure apparatus and the substrate processing apparatus.
- the maintenance management apparatus can perform maintenance work on the substrate processing apparatus in parallel with at least a part of maintenance work on the exposure apparatus.
- the exposure apparatus may include a laser apparatus as an exposure light source, and the maintenance work of the exposure apparatus may include maintenance work of the laser apparatus.
- the maintenance work may include a component replacement work force S.
- the maintenance management apparatus holds information regarding the part replacement time of the exposure apparatus and information regarding the part replacement time of the substrate processing apparatus, and based on such information, replaces parts of each apparatus.
- the maintenance management device holds maintenance information that one device needs the other device and maintenance information that allows each device to work independently. However, based on such information, the maintenance time of each device can be optimized.
- maintenance management for managing maintenance work of each apparatus in a substrate processing system including an exposure apparatus and a substrate processing apparatus connected inline to the exposure apparatus.
- a maintenance management method including a process of managing the process so that the process is performed.
- the maintenance operation of the exposure apparatus and the maintenance operation of the substrate processing apparatus are performed in a coordinated manner based on the information related to the maintenance of the exposure apparatus and the substrate processing apparatus, Unlike the case where the maintenance work of the exposure system and the maintenance process of the substrate processing system are performed independently, the maintenance timing has been optimized so that the maintenance work of both systems can be performed in parallel as much as possible. I can plan. This makes it possible to improve the operation rate without degrading the performance of the substrate processing system.
- the maintenance work includes not only work performed by the exposure apparatus itself, but also work performed by the operator informing the operator or the like.
- the productivity of highly integrated microdevices it is possible to improve the productivity of highly integrated microdevices by forming a device pattern on a substrate using the exposure apparatus of the present invention. Also, in the lithographic process, the productivity of highly integrated microdevices can be improved by performing processing on the substrate, including forming a device pattern on the substrate, using the substrate processing system of the present invention. Is possible. Therefore, it can be said that the present invention is a device manufacturing method using the exposure apparatus and the substrate processing system of the present invention from another viewpoint.
- FIG. 1 is a plan view schematically showing a configuration of a lithography system according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing the configuration of the exposure apparatus in FIG. 1.
- FIG. 3 is a block diagram schematically showing a configuration of a control system of the lithography system in FIG. 1.
- FIG. 4 is a schematic diagram showing a configuration of a control system of a lithography system according to the second embodiment.
- FIG. 4 is a schematic diagram showing a configuration of a control system of a lithography system according to the second embodiment.
- FIG. 5 is a flowchart for explaining an embodiment of a device manufacturing method according to the present invention.
- FIG. 6 is a flowchart showing processing in step 404 of FIG.
- FIG. 1 is a plan view showing the configuration force of the lithography system according to the first embodiment including the exposure apparatus and the substrate processing apparatus according to the present invention.
- the lithography system 100 shown in FIG. 1 is installed in a clean room.
- the lithography system 100 includes an exposure apparatus 10 installed on the floor surface of a clean room and an inline interface section (hereinafter referred to as an “inline IZF section”) on the Y side of the exposure apparatus 10 (left side in FIG. 1). ) Including CZD50 connected via 110.
- the lithography system 100 is installed in a clean room.
- the exposure apparatus 10 includes a chamber 16 provided with a partition wall 14 at a position slightly closer to the + X side in the center in the X-axis direction in FIG. 1, and an X-axis direction defined by the partition wall 14 inside the chamber 16.
- Main body of exposure apparatus 10A housed in one side (one X side) large chamber 12A (in FIG. 1, parts other than wafer stage WST and projection optical system PL are not shown), and a partition inside chamber 16 It includes a wafer loader system 40 as a substrate transfer system in which most of the small chamber 12B on the other side in the X-axis direction (+ X side) defined by the wall 14 is accommodated.
- a laser apparatus 1 disposed outside the chamber 16 is connected to the exposure apparatus body 10A via a routing optical system BMU.
- FIG. 2 schematically shows the configuration of the exposure apparatus 10 in a front view.
- the chamber 16 is indicated by a virtual line (two-dot chain line).
- the exposure apparatus 10 is a step-and-scan type scanning projection exposure apparatus, that is, a so-called scanner (also referred to as a “scanning” stepper).
- the laser device 1 includes a pulse laser that oscillates pulsed light in the far ultraviolet region such as a KrF excimer laser (oscillation wavelength 248 nm) or an ArF excimer laser (oscillation wavelength 193 nm). One is used.
- the laser device 1 is installed on the floor of a clean room where the chamber 16 is installed. Laser device 1 can also be placed in a room (service room) with a low degree of turn, different from a clean room, or in a utility space below the floor.
- F laser oscillation wavelength 157nm
- the vacuum ultraviolet light source may be used, or an EUV light source may be used.
- the exposure apparatus body 10A includes an illumination unit ILU, a reticle stage RST that holds a reticle R as a mask, a projection optical system PL, a wafer stage WST that holds a wafer W and can move freely in the XY plane. , A body BD on which the reticle stage RST and the projection optical system PL are mounted, and a main controller 120 that controls the entire apparatus.
- the illumination unit ILU includes an illumination system housing 111, a beam shaping optical system, an energy coarse adjuster, an optical integrator, an illumination system aperture stop plate disposed in the illumination system housing 111 in a predetermined positional relationship, An illumination optical system including a beam splitter, a relay optical system, and the like (both not shown).
- a field stop also referred to as a reticle blind or a masking blade
- a fixed blind and a movable blind is disposed inside the relay optical system of the illumination optical system.
- the optical integrator a fly-eye lens, a rod-type (internal reflection type) integrator, a diffraction optical element, or the like is used.
- the laser device 1 is connected to the beam shaping optical system provided at the incident end of the illumination unit ILU, that is, the incident end of the illumination optical system, via a light transmission optical system BMU.
- the illumination unit ILU uniformly forms a rectangular (for example, rectangular) slit-like illumination area IAR (defined by the opening of the fixed blind) extending in the X-axis direction on the reticle R held on the reticle stage RST. Illuminate with a good illuminance distribution.
- the internal structure of the lighting unit similar to that of the present embodiment includes, for example, Japanese Patent Laid-Open No. 10-112433, Japanese Patent Laid-Open No. 6-349701, and corresponding US Pat. No. 5,534,970. Is disclosed. To the extent permitted by national legislation in the designated country (or selected country of choice) designated in the international application, the disclosure in the above US patent is incorporated herein by reference.
- the reticle stage RST is formed by, for example, an air bearing (not shown) provided on the bottom surface of the reticle base 136, which is a top plate portion of a second column 134, which will be described later, constituting the body BD. It is supported by levitation through a few clearances.
- the reticle stage RST is fixed on the reticle stage RST by a reticle R force such as vacuum adsorption (or electrostatic adsorption).
- Reticle stage RST is two-dimensionally (X-axis) in the XY plane perpendicular to the optical axis of the illumination optical system (matching optical axis AX of projection optical system PL) by reticle stage driving device 112 including a linear motor.
- reticle stage RST is a reticle coarse movement stage that can be driven on reticle base 136 by a linear motor in the Y-axis direction within a predetermined stroke range, and the reticle coarse movement stage. It includes a reticle fine movement stage that can be finely driven in the X-axis direction, Y-axis direction, and ⁇ z direction by at least three actuators such as a voice coil motor. In FIG. 2, the reticle stage RST is shown as a single stage. It has been done.
- the reticle stage RST can be finely driven in the X axis direction, the Y axis direction, and the ⁇ z direction as described above by the reticle stage driving device 112, and can be driven in the Y axis direction. It is assumed that it is a single stage. Of course, a stage mechanism that does not have a coarse movement stage and a fine movement stage separately may be used as the reticle stage RST.
- the mover of the linear motor described above is attached to the end surfaces of the reticle stage RST on one side and the other side (the back side and the near side in FIG. 2) in the X-axis direction.
- the stators corresponding to the movers are respectively supported by support members (not shown) provided separately from the body BD.
- the reticle stage driving device 112 includes an actuator such as a linear motor or a voice coil motor as described above, but is shown as a simple block in FIG. 2 for convenience of illustration.
- reticle stage RST in the XY plane (including rotation in the 0z direction, which is the rotation direction around the Z axis) is a reticle laser interferometer fixed to reticle base 136 via moving mirror 15. (Hereinafter referred to as “reticle interferometer”) 13 is constantly detected with a resolution of, for example, about 0.5 to 1 nm.
- a pair of ⁇ -axis movable mirrors each having a hollow retroreflector at one end (+ Y side) in the Y-axis direction, is provided on the upper surface of the reticle stage RST at a predetermined interval in the X-axis direction.
- An X-axis moving mirror having a plane mirror force having a reflecting surface orthogonal to the X-axis direction is fixed to one end (+ X side) of the X-axis direction.
- a pair of reticle Y interferometer and reticle X interferometer are provided for each of these movable mirrors.
- a plurality of reticle interferometers and movable mirrors are provided, but in FIG. 2, these are representatively shown as movable mirror 15 and reticle interferometer 13.
- the + X side end face of reticle stage RST may be mirror-finished to form a reflecting surface (corresponding to the reflecting surface of the X moving mirror).
- Position information (or velocity information) of reticle stage RST is sent to main controller 120, and main controller 120 determines reticle stage drive device 112 based on the position information (or velocity information)! Through the reticle stage RST.
- a reticle fiducial mark plate (RFM plate) (not shown) is provided at a position on the Y side of the mounting area of reticle R of reticle stage RST.
- a plurality of types of measurement marks are formed on the RFM plate.
- the RFM plate similar to the present embodiment is disclosed in detail in, for example, Japanese Patent Application Laid-Open No. 2002-198303 and US Patent Application Publication No. 2001Z0041377 corresponding thereto.
- national legislation in the designated country (or selected selected country) designated in this international application the disclosure in the above US patent application publication is incorporated herein by reference.
- the body BD includes a first column 132 installed on the floor surface of the clean room and a second column 134 arranged on the first column 132.
- the first column 132 has three legs 137A, 137B, and 137C (however, the legs 137C at the back of the paper in FIG. 2 are not shown) and these legs 137A to 137C are supported almost horizontally.
- a lens barrel surface plate (also called a main frame) 138 constituting the top plate of the first column 132.
- Each of the leg portions 137A to 137C includes a support column 140 installed on the floor surface, and a vibration isolating unit 139 fixed to the upper portion of the support column 140.
- Each anti-vibration unit 139 insulates minute vibrations from the floor surface at the micro G level and hardly transmits to the lens barrel surface plate 138.
- the lens barrel surface plate 138 is formed with a circular opening (not shown) at substantially the center thereof, and the projection optical system PL is also inserted into this opening with an upward force.
- the projection optical system PL is provided with a flange FLG at a position slightly closer to the center in the height direction and slightly closer to the lower end thereof, and the projection optical system PL is supported by the lens barrel base plate 138 via the flange FLG. ing.
- the second column 134 is provided on the upper surface of the lens barrel surface plate 138 so as to surround the projection optical system PL and extends in the vertical direction, for example, three legs 41A, 41B, 41C (provided that The leg 41C on the back side of the paper in FIG. 2 is not shown) and the above-mentioned reticle base 136 that connects the upper end surfaces of these legs 41A to 41C and is supported substantially horizontally by these legs 41A to 41C. including.
- the projection optical system PL here is a bilateral telecentric reduction system, and a refractive optical system comprising a plurality of lens elements having a common optical axis AX in the Z-axis direction is used.
- 8 is used.
- a 1Z4 reduction optical system is used.
- the wafer stage WST is freely driven along the upper surface of the stage base SB in an XY two-dimensional plane (including 0 z rotation) by a drive system (not shown) such as a linear motor or a planar motor.
- the wafer table TB mounted on the XY stage 141 is included.
- the stage base SB is also called a surface plate, and in the present embodiment, the stage base SB is supported substantially horizontally via a plurality of, for example, three or four vibration isolation units 43 installed on the floor surface. That is, the stage base SB is separated from the body BD that holds the projection optical system PL and the like.
- Each anti-vibration unit 43 includes an air mount mechanism that supports the stage base SB, a voice coil motor that can finely drive the stage base SB in the direction of gravity (vertical direction: Z-axis direction in Fig. 2) with high response, and Is included.
- the air mount mechanism includes a part of a support member that supports the stage base SB from below, and a nosing that a part of the support member is attached to an opening end of the stage base SB via an elastic member (for example, a diaphragm). Contains. In this case, an airtight chamber is formed inside the housing.
- the hermetic chamber is connected to an electromagnetic regulator through an opening formed in the housing, and the pressure of gas, for example, air, which is filled from the outside into the hermetic chamber is adjusted by the electromagnetic regulator in accordance with an instruction from the main controller 120. .
- the air mount mechanism is configured to actively follow low-frequency vibrations up to approximately 2 OHz.
- the air mount mechanism also operates as a passive vibration isolator (vibration isolation pad) that absorbs high-frequency vibration components that cannot be followed by the voice coil motor.
- the voice coil motor includes a mover directly attached to the stage base SB, and a stator that generates a force for driving the stage base SB in the direction of gravity by electromagnetic interaction generated between the mover and the mover. have. This voice coil motor can actively follow vibrations with a frequency higher than about 20Hz. This voice coil motor is controlled by the main controller 120.
- the wafer table TB has a surface (XY plane) that is orthogonal to the optical axis AX direction (Z-axis direction) and the optical axis by a drive system (not shown) including an actuator such as a voice coil motor disposed on the XY stage 141. ), Ie, the rotation direction around the X axis is the ⁇ X direction, and the rotation direction around the Y axis is the 0 y direction.
- wafer W is held by vacuum chucking (or electrostatic chucking) via wafer holder 25.
- a wafer laser interferometer (hereinafter referred to as "wafer interferometer") 31
- the position of the wafer table TB (wafer W) in the XY plane is, for example, 0.5 by the wafer interferometer 31 that is fixedly supported by the moving mirror 27 that reflects the powerful laser beam and is suspended from the lens barrel surface plate 138.
- ⁇ always detected with a resolution of about Lnm.
- the wafer table TB has a reflecting mirror perpendicular to the Y-axis direction that is the scanning direction at the time of scanning exposure and a reflection perpendicular to the X-axis direction that is the non-scanning direction.
- a laser interferometer is also provided with an X laser interferometer for X-axis position measurement and a Y laser interferometer for Y-axis position measurement.
- these are representatively shown as a movable mirror 27 and a wafer interferometer 31.
- the end surface of the wafer table TB may be mirror-finished to form a reflecting surface (corresponding to the reflecting surface of the movable mirror 27).
- the X laser interferometer and the Y laser interferometer are multi-axis interferometers that have multiple measurement axes.
- rotation shown (rotation around the Z axis is ⁇ z rotation)
- Pitching ⁇ X rotation that is rotation around the X axis
- rolling (0 y rotation that is rotation around the Y axis)
- the multi-axis interferometer described above is inclined at 45 ° through a reflecting surface installed on the wafer table TB, and a laser beam is applied to a reflecting surface (not shown) installed on the body BD on which the projection optical system PL is placed. Irradiation may be performed to detect relative position information regarding the optical axis direction (Z-axis direction) of the projection optical system PL.
- the wafer stage driving device 128 includes a linear motor, a planar motor, a voice coil motor, and the like. In FIG. 2, the wafer stage driving device 128 is shown as a simple block for convenience of illustration.
- a reference mark plate FM On the wafer table TB, a reference mark plate FM whose surface is almost the same height as the surface of the wafer W is fixed. Various reference marks are formed on the surface of the reference mark plate FM.
- a reference flat plate 143 having a highly flat upper surface is fixed.
- the surface of this reference flat plate 143 is the reference mark plate F
- a slit opening is formed in a part of the reference plane plate 143, and this slit opening is excluded.
- the portion is a reflective surface on which a reflective film is formed.
- a photoelectric conversion element (not shown) such as a photomultiplier tube (PMT) is disposed inside the wafer table TB below the slit opening.
- a photoelectric conversion signal having the power of the photoelectric conversion element is supplied to the main controller 120.
- Main controller 120 receives the photoelectric conversion signal of the photoelectric conversion element force while positioning the above-mentioned RFM plate in the field of view of projection optical system PL and moving wafer table TB in the Y-axis direction or the X-axis direction.
- the position information (or speed information) of the wafer table TB is sent to the main controller 120.
- the main controller 120 sets the wafer stage driving device 128 based on the position information (or speed information)! To control the wafer table TB.
- the exposure apparatus main body 10A of the present embodiment has a light transmission system 160a and a light reception system 160b, and the position of the surface of the wafer W with respect to the optical axis AX direction (Z-axis direction) and the inclination with respect to the XY plane.
- An oblique incidence type multi-point focus position detection system (hereinafter referred to as “multi-point AF system” as appropriate) is provided.
- a multi-point AF system similar to the multi-point AF system of the present embodiment is disclosed in detail in, for example, Japanese Patent Laid-Open No. 6-283403.
- Main controller 120 moves wafer stage WST in the Z-axis direction via wafer stage driving device 128 based on focus signals from multi-point AF systems 160a and 160b during scanning exposure, which will be described later.
- the irradiation area of the illumination light IL Autofocus (automatic focusing) and auto-leveling are performed so that the image plane of the projection optical system PL substantially matches the surface of the wafer W within the exposure area IA described above.
- an off-axis alignment system ALG that detects alignment marks (alignment marks) on the wafer W, reference marks on the reference mark plate FM, etc. is used as the lens barrel of the projection optical system PL. It is arranged on the side.
- the alignment system ALG irradiates the target mark with a broadband detection light beam without exposing the resist on the wafer W, and forms an image on the light receiving surface by the reflected light from the target mark.
- An image processing type FIA (Field Image Alignment) type sensor is used, which picks up the image of the image and the image of the index (not shown) using an image sensor (CCD, etc.) and outputs the image signals.
- FIA Field Image Alignment
- the target mark is irradiated with coherent detection light to detect scattered light or diffracted light generated from the target mark, or two diffracted lights (for example, of the same order) generated from the target mark.
- coherent detection light to detect scattered light or diffracted light generated from the target mark, or two diffracted lights (for example, of the same order) generated from the target mark.
- alignment sensors that detect the interference by using them alone or in combination.
- the wafer loader system 40 includes a Y guide 18 extending in the Y-axis direction, and an X guide positioned above the Y guide 18 (the front side in FIG. 1) and extending in the X-axis direction. 20 as a conveyance guide.
- the X guide 20 is provided in a state of penetrating the partition wall 14.
- a horizontal articulated robot (scalar robot) 26 that is driven by a drive device (not shown) and moves along the Y guide 18 is provided.
- the X guide 20 is provided with a wafer load arm 28, a wafer, and an unload arm 30 which are driven by a driving device (not shown) and move along the X guide 20.
- the partition wall 14 is formed with openings through which the Ueno ⁇ load arm 28 and Ueno ⁇ unload arm 30 can pass.
- a turntable (rotary table) 32 is arranged near the + X side end of the X guide 20, and a wafer edge sensor (not shown) is arranged near the turntable 32. ing.
- each part of the wafer loader system 40 described above is controlled, and information related to the wafer being transferred is communicated with a control device on the CZD side described later via a communication line. That is, a loader control device 34 that performs communication is provided.
- the inline IZF unit 110 includes a chamber 212 disposed on the ⁇ Y side of the chamber 16, an inline delivery unit 114 disposed in the vicinity of the + Y side end of the chamber 212, and A horizontal articulated robot 116 disposed on the Y side of the in-line delivery unit 114 is included.
- the in-line delivery unit 114 includes a base and two wafer delivery units 124A and 124B each having a set of three support pin forces provided on the base at predetermined intervals in the X-axis direction. Yes.
- the inline delivery unit 114 is not limited to the configuration shown in FIG. 1, and is, for example, arranged on the upper and lower sides at a predetermined interval and driven in the vertical direction in conjunction with a drive mechanism (not shown).
- a configuration having a wafer transfer section and an unload-side wafer transfer section may be adopted.
- As each wafer transfer section a configuration including a plate-like member and a set of three support pins fixed to the upper surface of the plate-like member can be adopted.
- a carrier table 118 is disposed inside the chamber 212 as necessary, and a buffer carrier 119 for temporarily storing Weno and W is placed on the carrier table 118.
- the CZD 50 includes two chambers 52, 54 arranged adjacent to each other in the radial direction.
- an X guide 56 extending in the X-axis direction is disposed.
- a horizontal articulated robot (scalar robot) 58 that is driven by a driving device (not shown) and moves along the X guide 56 is provided.
- carrier stands 60 ⁇ , 60 ⁇ , and 6OC are arranged along the X-axis direction at a position on the heel side of the X guide 56 inside the chamber 52.
- carrier tables 60A, 60B, and 60C open carriers (Open Carrier: hereinafter referred to as “OC” as appropriate) 24A, 24B, and 24C capable of storing a plurality of wafers are mounted.
- OC24A, 24B, and 24C are inserted / removed through a loading / unloading port (not shown) that can be opened and closed by a door (not shown) provided on the side wall of the chamber 52 on the ⁇ Y side.
- OC24A, 24B, 24C can be put in and out of the OC24A, 24B, 24C by PGV (Person Guided Vehicle) and then manually by the operator. It may be automatically performed after being transported by an omated guided vehicle.
- PGV Person Guided Vehicle
- the OC24A, 24B, and 24C may be mounted on the carrier bases 60A, 60B, and 60C from above using OHT (Over Head Transfer).
- the inside of the chamber 52 is a coating that comprehensively controls each component of the CZD50.
- a development control device 62 is provided. The coating / development control device 62 controls the scalar robot 116 and the like in the inline IZF unit 110 described above, in addition to the wafer conveyance system in the CZD 50 and the like.
- a wafer transfer section 64 is provided at a position slightly closer to the + X side center in the X-axis direction.
- the wafer transfer section 64 includes a base and a set of three support pins fixed on the base.
- a Y guide 66 extending in the Y-axis direction is disposed on the + Y side of the wafer transfer section 64.
- a horizontal articulated robot (scalar robot) 68 that is driven by a driving device (not shown) and moves along the Y guide 66 is provided.
- the first developing unit 70, the second developing unit 72, and the beta unit 74 are sequentially arranged from the left to the right in FIG. Yes. Further, on the + X side of the Y guide 66, the first application unit 76, the second application unit 78, and the cooling unit 80 face the first developing unit 70, the second image unit 72, and the beta unit 74, respectively. Are arranged.
- the first application unit 76 and the second application unit 78 have a spin coater.
- This spin coater forms a uniform resist film on a wafer by dropping the resist on a horizontal wafer and rotating the wafer.
- This spin coater includes a combination of a resist supply system, a spin motor and a cup. The number of rotations can be set to several thousand rotations per minute.
- the beta section 74 includes a baking device.
- a baking apparatus a resistance heating method, an infrared heating method, or the like can be used.
- pre-beta (PB) and post-exposure bake (PEB) are performed using a baking apparatus.
- the former is a heat treatment performed after the resist is applied on the wafer to evaporate the residual solvent in the coating film and to enhance the adhesion between the coating film and the wafer. In order to carry out before exposure, it is carried out below the temperature at which the polymer does not overlap and thermal decomposition of the additive does not occur.
- the latter is a heat treatment performed after the exposure and before the development processing in order to reduce deformation of the resist pattern (resist sidewall shape) due to the standing wave effect when exposed to light of a single wavelength. It is also used for the purpose of promoting catalytic reaction after exposure of chemically amplified resist.
- the cooling unit 80 includes a cooled flat plate called a cooling plate, for example. This plate is cooled, for example, by circulating cooling water. In addition, electronic cooling by the Peltier effect may be used. In the present embodiment, the wafer heated during PB is cooled to a temperature at which there is no influence in the exposure apparatus 10.
- the first developing unit 70 and the second developing unit 72 include a developing device that develops the wafer that has been exposed by the exposure device 10 and has a resist pattern image formed thereon.
- a developing device any of a spin type, a dip type, a spray type, and the like can be used.
- a wafer transfer section 82 is provided on the + Y side of the Y guide 66 and at the boundary between the channel 54 and the chamber 212.
- the wafer transfer unit 82 includes a base and a set of three support pins fixed on the base.
- FIG. 3 is a block diagram showing the configuration of the control system of lithography system 100.
- the control system on the exposure apparatus 10 side is configured with a main controller 120 as a center, and the loader controller 34 and the like described above are placed under the control of the main controller 120.
- the main controller 120 is composed of a workstation (or a microcomputer).
- the main controller 120 is provided with a pointing device such as a keyboard and a mouse, and an input / output device 230 having a CRT display or a liquid crystal display. ing.
- control system on the CZD 50 side is configured around the coating / development control device 62, and the coating / development control device 62 controls the scalar robots 58, 68, 116, and the like.
- the CZD-side substrate transport system is configured by the scalar robots 58, 68, 116, the Y guide 66, the X guide 56, and the like.
- An input / output device 63 similar to the input / output device 230 is also connected to the coating / development control device 62.
- the data communication is possible.
- information relating to the wafer being transferred is mainly exchanged between the loader control device 34 and the coating / development control device 62.
- the main controller 120 and the coating / development controller 62 there are various types as described later. Exchange of information.
- wafers W are stored in OC24A, 24B, 24C in units of lots (for example, 25 wafers), and these OC24A, 24B, 24C are placed on carrier tables 60A, 60B, 60C. It is assumed that each is placed.
- the scalar robot 58 takes out the first wafer (hereinafter referred to as “weh 1 ⁇ ” for convenience) with the OC24B internal force, and places it on the wafer transfer unit 64. At this time, the scalar
- the scalar port bot 68 carries the wafer W from, for example, the wafer transfer unit 64 into the first application unit 76.
- the second robot (referred to as "wafer W" for convenience) is taken out from the scalar robot 58 force OC24B internal force and placed on the wafer delivery unit 64.
- the scalar robot 68 transfers the wafer W onto the wafer transfer unit 64.
- the force is also carried into the second application part 78.
- the bite bot 68 takes the wafer W out of the first application part 76 and carries it into the beta part 74.
- the heat treatment (PB) of the wafer W is performed by the baking device in the baking part 74.
- wafer W the third wafer
- the scalar robot 68 uses the wafer W.
- the temperature that does not affect each part in the exposure chamber 12A when it is carried into the exposure chamber 12A for example, the target temperature of the air conditioning system in the exposure chamber 12A determined in the range of 20 to 25 ° C. As done. In recent exposure apparatuses, temperature control is an important item because a pattern with a minute line width is transferred and formed on a wafer. This is because even if the wafer expands / shrinks due to a slight temperature change, it causes various adverse effects such as abnormal line width and poor overlay. However, the target temperature at the time of cooling may be determined in consideration of the temperature change until the wafer stage WST of the exposure apparatus is transported after cooling.
- the scalar robot 68 removes the resist-coated wafer W from the second coating unit 78.
- a fourth wafer (referred to as “wafer W” for the sake of convenience) is taken out and loaded into the beta section 74, and is then placed on the wafer delivery section 64 by the scalar robot 58 at that time.
- Wafer W is placed on wafer transfer unit 82.
- the wafer W is taken out from the beta section 74.
- the scalar robot 68 takes out the wafer W after resist coating from the first coating unit 76 and loads it into the beta unit 74.
- the color wafer 58 carries the fifth wafer (referred to as “wafer W” for convenience) placed on the wafer delivery unit 64 from the wafer delivery unit 64 to the first application unit 76.
- resist coating, PB, cooling, and wafer transfer operations associated with the series of processes are sequentially repeated in the same manner as described above, and the wafer W is sequentially transferred to the wafer transfer unit 82. Placed on top.
- the scalar robot 116 transfers unexposed (unexposed) wafers sequentially placed on the wafer transfer unit 82 on the wafer transfer unit 124 A on the load side of the inline transfer unit 114. In order.
- the scalar robot 26 moves to the left end position along the Y guide 18, and passes through the opening of the chamber 16 from the inline delivery unit 114 to the wafer W.
- the scalar robot 26 moves the turntable 32 along the Y guide 18. Move forward to the right in Fig. 1, place wafer W on turntable 32, and
- the scalar robot 26 receives the next wafer W
- the turntable 32 is rotationally driven by a drive system (not shown), whereby the wafer W held on the turntable 32 is rotated. While this wafer W is rotating,
- the wafer edge is detected by the wafer edge sensor, and based on the detection signal, the loader control unit 34 performs the notch direction of the wafer W, the center of the wafer and the turn center.
- the amount of eccentricity (direction and size) from the center of one bull 32 is required.
- the loader control device 34 rotates the turntable 32 to align the direction of the notch portion of the wafer W with a predetermined direction.
- the load arm 28 is in a predetermined wafer receiving position, and the force for receiving the wafer W on the turntable 32. At this time, the wafer center and the turntable previously obtained are determined.
- the load arm 28 starts to move along the X guide 20 by directing the force above the wafer stage WST waiting at a predetermined loading position.
- the scalar robot 26 has already transferred the wafer W placed on the wafer transfer section 124A of the inline transfer section 114 by the scalar robot 116 before that time.
- the scalar robot 26 moves to a predetermined standby position, and starts rotation of the turntable 32 and wafer edge detection by the wafer edge sensor.
- the amount of eccentricity (direction and size) between the center of the haha and the center of the turntable 32 is calculated.
- the Y component of the eccentricity is corrected.
- the wafer stage WST is finely driven in the Y-axis direction. [0113] Then, an exposure operation for wafer W passed on wafer stage WST is performed.
- the reticle R (reticle stage RST) and wafer W (wafer stage WST) are moved to the scanning start position for exposure of each shot area, as in a normal scanner.
- a scanning exposure operation in which a mask-like illumination area is illuminated with exposure illumination light, and the pattern of the reticle R is sequentially transferred to each shot area on the wafer W via the projection optical system PL.
- wafer stage WST moves to the unloading position, that is, the above-described loading position, and unload arm 30 receives the exposed wafer W and transports it above Y guide 18. Then there is a scalar mouth waiting
- the wafer is transferred to the wafer transfer unit 124B on the unload side of the inline transfer unit 114.
- the wafers after the third wafer W mounted on the wafer transfer section 124A are sequentially taken in and placed on the wafer stage WST through the same path as described above.
- the exposure of the first wafer W is completed on the exposure apparatus 10 side, and the wafer W is a scalar on the exposure apparatus 10 side.
- the scalar robot 1 16 forces The operation to transfer and place the wafer W before exposure from the wafer transfer unit 82 on the wafer transfer unit 124A and the exposure are completed.
- the operation of transporting and placing the wafer W on the wafer delivery unit 82 from the wafer delivery unit 124B is repeatedly performed in a predetermined order.
- the exposed first wafer W transferred and placed on the wafer transfer unit 82 from the wafer transfer unit 124B by the scalar robot 116 in the in-line IZF unit 110 is It is carried into the beta section 74 by the scalar robot 68, and the beta section 74
- PEB is performed by the internal baking equipment.
- the beta section 74 a plurality of wafers can be accommodated simultaneously.
- the wafer W on which PEB has been completed is removed from the beta section 74 by the scalar robot 68.
- the image is started by the developing device in the first developing unit 70.
- the scalar robot 68 moves the second wafer W that has been exposed to the wafer.
- the wafer W is placed on the transfer part 82, the wafer W is transferred to the wafer transfer part 8
- Operations are performed in a predetermined order.
- the scalar robot 68 performs the first development of the wafer W.
- the scalar robot 58 carries it into a predetermined storage stage in the OC24B. Thereafter, in the CZD50, the second and subsequent wafers are processed in the same way as the wafer W, and the PE
- the components in the CZD50 and the scalar in the inline IZF unit 110 under the control of the coating and developing control device 62 are used.
- the robot 116 and the like repeatedly take out the wafer from the OC24B, apply the resist, perform PB, cooling, and carry the wafer in accordance with these operations in a predetermined procedure and order, and sequentially place the wafers before exposure on the wafer delivery unit 124A. Placed.
- the wafer is taken out from the OC24B, resist coating, PB, cooling, and the wafer transfer operation associated with these operations, and the wafer delivery unit 124B are sequentially mounted.
- the PEB, development, and wafer transfer into the OC24B and the wafer transfer operation associated with these operations are repeated in a predetermined procedure and order. Is called.
- information relating to wafer conveyance is exchanged between the coating / development control device 62 and the loader control device 34. Based on this information, the coating / development control device 62, loader By controlling each part of each wafer transfer system by the control device 34, the above-mentioned wafer exchange (delivery) between the CZD50 side and the exposure apparatus 10 side via the inline IZF part 110 is smooth. To be done! /
- Excimer lasers generally contain a medium gas such as halogen gas such as fluorine and krypton, rare gas such as argon, and three mixed gases such as helium and neon as buffer gases in a laser chamber, and discharge in the laser chamber.
- halogen gas such as fluorine and krypton
- rare gas such as argon
- three mixed gases such as helium and neon as buffer gases in a laser chamber, and discharge in the laser chamber.
- the glow discharge between the electrodes causes the halogen gas (fluorine F) to react with the rare gas (Kr, Ar, etc.) to produce pulsed light of nanosecond order.
- the hydrogen and rogen gases are combined with impurities generated in the chamber and adsorbed inside the chamber, so that the concentration of the halogen gas decreases and the laser pulse energy decreases.
- each component of the excimer laser light source deteriorates.
- ultraviolet light having a high light intensity is emitted, the transmission window through which the laser light passes and a beam splitter (not shown) are also deteriorated.
- the power supply voltage is gradually increased to keep the Nors energy constant.
- the gas exchange operation is performed when the applied voltage reaches the upper limit, the gas concentration is returned to an appropriate value, and the applied voltage is lowered accordingly to reduce the pulse energy. It is necessary to keep it constant.
- the laser apparatus 1 having a KrF excimer laser or ArF excimer laser force is used as a light source, gas exchange is required.
- the gas in the laser device 1 needs to be changed about once every three days. This gas exchange takes about 30 minutes, and the exposure apparatus 10 cannot perform any operation using laser light during this gas exchange.
- the position of the wafer table TB is measured by a laser interferometer that irradiates a laser beam (measurement beam) perpendicularly to the reflecting surface of the X moving mirror and Y moving mirror and receives the reflected light beam of each reflecting surface force.
- Each laser interferometer measures a change in the position of the moving mirror reflecting surface in the length measuring axis direction (direction of the length measuring beam) with a reference mirror (not shown) as a reference. Therefore, if the reflecting surface of the movable mirror is bent, the measured position information of the wafer table includes an error corresponding to the bending of the reflecting surface.
- each moving mirror must have a length in the X-axis direction and the Y-axis direction corresponding to the moving stroke of the wafer table TB (XY stage 141), and has a considerable length. It is not easy to ensure a good flatness no matter how highly accurate surface processing (mirror processing) is performed. Also, even if a movable mirror with good flatness can be manufactured, there is a high probability that distortion will occur when it is fixed to the wafer table TB, and distortion will occur due to changes over time after fixation. . Furthermore, as the exposure accuracy required for an exposure apparatus increases, it is not possible to manufacture a plane mirror having a flatness level that satisfies the required accuracy when considering the required overlay accuracy, alignment accuracy, etc.
- the local tilt of the moving mirror is measured by an interferometer disclosed in Japanese Patent No. 32 95846.
- a method of obtaining the shape of the reflecting surface of the movable mirror by integrating the above can be used. This method takes about 10 minutes to move the movable mirror.
- the wafer is held by suction on the wafer holder by vacuum suction or electrostatic suction. For this reason, the wafer is deformed following the surface shape of the wafer holder. Therefore, if the flatness of the wafer holder is poor, the flatness of the wafer surface attracted and held by the wafer holder also becomes poor, resulting in an exposure failure due to defocusing.
- an exposure apparatus that uses ArF excimer laser light or KrF excimer laser light as illumination light IL for exposure and uses a projection optical system with a large numerical aperture (NA) is problematic. The unevenness of the wafer holder with a certain level of force cannot be ignored.
- the multi-point AF system is used to hold a measurement wafer (super-flat) with a very high degree of flatness held by suction on a wafer holder.
- a relatively large number of methods are used.
- the surface position information of the object to be measured at a plurality of detection points is individually measured by a plurality of sensors.
- Output variation (such as those caused by individual differences) makes it difficult to accurately measure the holder flatness due to the output variation, as well as wafer focus during exposure. This causes a leveling control error, and has a significant effect on the pattern imaging performance.
- the multi-point AF system (160a, 160b) is calibrated for the offset between sensors, and the multi-point AF system (160a, 16 Ob) after the calibration is used.
- the above-mentioned holder flatness measurement is performed.
- the reference flat plate 143 is used for the sensor-to-sensor offset in the same manner as disclosed in, for example, International Publication No. 02Z054462. Offset calibration can be performed.
- a method for measuring the holder flatness a method disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-048527 can be employed. That is, when measuring the above-mentioned holder flatness, position information (surface position information) in the Z-axis direction at a plurality of measurement points on the surface of the super flat wafer sucked and held on the wafer holder 25 is obtained between the above-mentioned sensors.
- a super flat wafer without using the reference flat plate 143 may be used for the calibration of the offset between the sensors.
- a method using such a super flat wafer is also disclosed in WO 02/054462.
- the position coordinates on the stage coordinate system of the reference mark (fiducial mark) formed on the reference mark plate FM on the wafer table TB for the baseline measurement of the alignment system Measurement is essential. Measurement of the position coordinates of the fiducial mark on the stage coordinate system is based on the assumption that the positional relationship between the moving mirror 27 (X moving mirror and Y moving mirror) on the wafer table TB and the fiducial mark plate FM is a predetermined relationship.
- the position relation between the alignment center of the alignment ALG and the reference mark and the X and Y coordinates measured by the wafer interferometer 31 at the time of detection that is, the reference mirror of the X moving mirror and the Y moving mirror is used as a reference. Based on the positional information, the position coordinates of the reference mark on the stage coordinate system are calculated. Therefore, it is desirable that the relationship between the reference mark plate FM and the moving mirror 27 (X moving mirror, Y moving mirror) on the wafer table TB is always constant.
- the operator touches the moving mirror 27 (X moving mirror, Y moving mirror) and the fiducial mark plate FM, or due to changes over time due to the influence of heat, etc.
- the reference mark plate FM may rotate with respect to the moving mirror 27 (X moving mirror, Y moving mirror). If the positional relationship between the two fluctuates in this way, an error occurs in the measurement of the reference mark position, and the baseline measurement accuracy may be reduced, leading to poor exposure accuracy. Therefore, in this embodiment, the fiducial mark on the reference mark plate FM is detected by the alignment system ALG, and the movement is performed based on the detection result and the measurement result of the wafer interferometer 31 at that time. How much the positional relationship between the mirror and fiducial mark deviates from the initial state Measure whether or not to correct the initial value.
- a dynamic factor called a synchronization error between the reticle stage RST (reticle) and the wafer stage WST (Weno) during scanning exposure is caused on the wafer. It may cause the positional deviation (or distortion) of the transferred pattern image and degradation of resolution. It is also known that the synchronization accuracy between reticle stage RST (reticle) and Weno, stage WST (wafer) changes over time, and exposure accuracy may decrease over time.
- the reticle stage RST and wafer stage WST are moved synchronously according to, for example, the shot map, and the position of the reticle stage RST between them is measured, and the position of the wafer stage WST Take the measurement result with the interferometer 31 that measures. Then, it is determined whether a synchronization error has occurred between the measurement result of the interferometer 13 on the reticle side and the measurement result of the interferometer 31 on the wafer side.
- Such measurement of synchronization error is described in, for example, Japanese Patent Application Laid-Open No. 11-067655.
- alignment marks search marks
- the alignment mark may not enter the alignment measurement area (field of view). In such a case, an operator or the like must assist, and this may cause a decrease in throughput.
- a predetermined number of wafers are sent from the CZD side to the exposure apparatus side, and the loading and unloading operations are sequentially executed repeatedly. Measure reproducibility.
- load and unload are repeatedly executed to measure wafer load reproducibility. With these measurements, When the actuality is lowered, it is necessary to correct the conveyance sequence.
- Measurement of the reproducibility of the wafer load described above usually requires about 15 to 30 minutes, depending on the number of wafers used in the measurement or the number of repetitions of the measurement.
- the AF surface is a virtual surface defined when the outputs of a plurality of sensors in the multi-point AF system (160a, 160b) in which the offset between the sensors is adjusted are all reference values (for example, zero).
- a simple reference plane is a virtual surface defined when the outputs of a plurality of sensors in the multi-point AF system (160a, 160b) in which the offset between the sensors is adjusted.
- the alignment between the AF surface and the wafer table upper surface that is, the adjustment for making the AF surface and the moving surface (running surface) of the wafer stage parallel is executed as follows. To do.
- wafer stage WST is supported on a stage base SB separately from first column 132 holding projection optical system PL (see FIG. 2). ).
- This stage base SB is supported by the vibration isolation unit 43 described above.
- the position of wafer stage WST in the height direction is adjusted by adjusting the amount of air in the air mount mechanism that forms anti-vibration unit 43. Coarse adjustment is possible by adjusting the height position. Further, the surface position of the reference flat plate 143 on the wafer table TB is located on substantially the same surface as the surface position of the wafer when held on the wafer holder 25.
- each sensor of the multi-point AF system (160a, 160b) is pre-calibrated so as to be the best focus position force origin measured as described later using, for example, an aerial image measuring instrument. Yes.
- the above-described AF surface substantially coincides with the image plane of the projection optical system PL. Therefore, in the present embodiment, the surface position information of the reference plane plate 143 is measured using the multipoint AF system (160a, 160b), and the anti-vibration unit 43 is used based on the measurement result.
- the surface position of the reference plane plate 143 is aligned with the AF surface, and the AF surface and the moving surface (running surface) of the wafer stage are adjusted in parallel. To do.
- the imaging characteristics of the projection optical system PL have a significant effect on the transfer accuracy of the pattern. Therefore, the imaging characteristics are frequently measured and the imaging characteristics are not shown. It is necessary to make adjustments using a mechanism that drives multiple lens elements.
- the measurement result of the best focus position of the projection optical system PL is also used to adjust the origin position of each sensor of the multipoint AF system (16 Oa, 160b).
- halogen lamp which is a light source of the alignment ALG
- a chemical filter provided in the chamber 16 of the exposure apparatus 10
- the consumables laser consumables constituting the laser apparatus 1
- parts that have a long life and need to be replaced regularly such as optical parts in the lighting unit ILU.
- halogen lamps need to be replaced with a period of about one and a half months.
- Chemica The filter needs to be replaced every 3-6 months, and the laser consumables and optical components need to be replaced every 1 year.
- the longer the exchange period the longer the time required for one exchange, that is, the longer the downtime of the exposure apparatus during the exchange.
- the lifetime of parts other than halogen lamps varies depending on the exposure equipment installation environment and usage conditions, so it is not possible to define the lifetime of the parts.
- the environment and usage status of the exposure apparatus are monitored in the exposure apparatus, and the usage status and the like are managed by the main controller 120. Then, at an appropriate replacement time, the replacement time is displayed on the display of the input / output device 230 to inform the operator that the replacement time for each part has come.
- the first coating unit 76 and the second coating unit 78 in the CZD 50 have a spin coater, and the spin coater includes a rotary drive mechanism that rotates the wafer at a high speed while holding the wafer horizontally. Then, a centrifugal force is applied to the processing solution such as resist supplied to the wafer to spread the processing solution over the entire surface of the wafer. At the time of this spin coating, the surplus of processing liquid supplied on the wafer is scattered outside the wafer. For this reason, the spin coater is provided with a hollow cup surrounding the periphery of the wafer to prevent the processing liquid from splashing outward.
- the treatment liquid splashed during spin coating adheres to the inner wall of the cup that prevents the treatment liquid from splashing outward, so that when this attached treatment liquid dries and solidifies,
- the inner wall force of the cup is also peeled off by impact or the like, and adheres to the surface of the wafer, causing poor processing and contamination of the wafer.
- the solidified product of the processing liquid is laminated on the inner wall of the cup, the surface shape becomes uneven, disturbing the airflow in the cup during the rotation process. Then, the turbulence force of the air current S affects the coating film on the outer periphery of the wafer, and may cause non-uniform film thickness of the coating film.
- JP-A-5-82435 and US Pat. No. 5,312,487 corresponding thereto disclose a coating apparatus having a cup cleaning mechanism.
- the cup cleaning is performed at the stage where resist coating is performed on a predetermined number (for example, 500) of wafers. This cup cleaning takes about 10 minutes.
- the coating / developing control device 62 monitors the usage status of each part, and when the appropriate replacement time for each part is reached, the replacement time is displayed on the display of the input / output device 63 and the operator. Is informed that it is time to replace each part.
- information related to the above-mentioned maintenance on the CZD50 side for example, information related to cup cleaning (timing and required time), parts replacement timing, time required for parts replacement, etc.
- Application / development control It is managed in device 62 and the information is sent to main controller 120.
- the main controller 120 of the exposure apparatus 10 receives the information regarding the above-mentioned maintenance on the CZD 50 side from the coating / development control apparatus 62, and determines the operation of the own apparatus (exposure apparatus 10). At this time, the main control device 120 of the exposure apparatus 10 performs maintenance work (for example, a. To i. Described above) of its own apparatus (exposure apparatus 10) according to the specific content of the maintenance information. Perform at least one specific action) in coordination with CZD50 maintenance work. Specifically, the main controller 120 takes into account the contents of maintenance work at the CZD50, the start time of the work, the time required for the work, etc.
- maintenance work for example, a. To i. Described above
- the main controller 120 takes into account the contents of maintenance work at the CZD50, the start time of the work, the time required for the work, etc.
- At least one operation of the device that can be executed in parallel with the maintenance operation on the CZD50 side is determined, and the maintenance timing is optimized.
- the downtime (which is also the downtime of the C / D50) of the exposure apparatus 10 required to perform the specific operation can be reduced as a whole, so that it is connected inline to the CZD50.
- the operating rate can be improved without degrading the performance of the exposure apparatus 10.
- any one or more measurement patterns are transferred to a plurality of regions on the wafer W by the exposure apparatus 10, and the wafer W to which the measurement patterns are transferred is transferred to the wafer W.
- a typical example of this type of measurement method is a measurement method of various imaging characteristics (including the best focus position) of the projection optical system PL.
- main controller 120 of exposure apparatus 10 includes maintenance information in which one apparatus requires the other apparatus, for example, information on various measurement methods using the printing method described above, and each Maintenance information that enables the device to work independently, maintenance information from a. To h. Described above, information on CZD cup cleaning, information on parts replacement, etc. are held.
- the main control device 120 is adapted to optimize the maintenance time of each device based on such information. This reduces the overall downtime of the Resoda Duffy System 100!
- the main controller 120 is under maintenance of the CZD 50 ( In parallel with this, when the original operation of the exposure apparatus must be stopped), it is necessary to stop the original operation of the apparatus, which is necessary for maintaining the performance of its own apparatus. It can be decided to take action. As a result, it is possible to reduce the exposure apparatus downtime (which is also the CZD50 downtime) required to perform the specific operation as a whole, and this allows the exposure apparatus connected inline to the CZD50. It is possible to improve the operating rate without deteriorating the device performance.
- the exposure apparatus downtime which is also the CZD50 downtime
- the main control device 120 of the exposure apparatus 10 also serves as a maintenance management apparatus that performs the maintenance work of the exposure apparatus and the maintenance work of the CZD 50 in a coordinated manner. Yes.
- the main controller 120 allows the maintenance work for both systems to be performed in parallel as much as possible. It is possible to optimize the maintenance timing, thereby improving the operation rate without degrading the performance of the lithography system 100.
- the maintenance operation of the exposure apparatus is determined based on the maintenance information of CZD50.
- the present invention is not limited to this. Based on the determination of some operation of the exposure apparatus, it is possible to reduce downtime in the same manner.
- FIG. 4 is a block diagram showing the configuration of the control system of the lithography system according to the second embodiment.
- the host computer 90 is commonly connected to the coating and developing apparatus 62 on the CZD 50 side and the main controller 120 of the exposure apparatus 10. It has the characteristics.
- the men to be executed by CZD50 Maintenance work items (including parts replacement) and maintenance work items to be executed by the exposure apparatus 10 (including parts replacement and various self-calibrations) are the same as those in the first embodiment described above.
- the host computer 90 comprehensively manages the necessity of maintenance on the exposure apparatus 10 side and the CZD50 side, and performs maintenance work on the CZD50 side and maintenance work on the exposure apparatus 10 side in a coordinated manner. It becomes.
- the host computer 90 classifies the maintenance items to be performed using the exposure apparatus 10 and the CZD 50 and the maintenance items to be performed by each of the above-mentioned apparatuses individually, and each apparatus alone.
- the maintenance items to be performed are managed so that they are performed in parallel on both devices as much as possible.
- the host computer 90 performs maintenance work for the exposure apparatus 10 and maintenance for the CZD 50 connected to the exposure apparatus 10 in-line. Therefore, unlike the case where the maintenance work for the exposure apparatus 10 and the maintenance work for the CZD50 are performed independently, the host computer 90 can perform maintenance work on both apparatuses. By optimizing the maintenance timing so that it is performed in parallel as much as possible, it is possible to improve the operation rate without degrading the performance of the lithographic system.
- the host computer 90 classifies the maintenance that requires both the exposure apparatus 10 and the CZD50 and the maintenance that can be performed by each apparatus, and the optimum timing (that is, the independent By performing separate maintenance on both devices in parallel, the downtime of the entire lithography system can be shortened as much as possible and the operating rate can be improved.
- the main control device 120 of the exposure apparatus 10 and the coating / development control device 62 of the CZD 50 receive the contents of the maintenance work in addition to the maintenance work timing (timing).
- the case where the required time is sent to the host computer 90 has been described, but the present invention is not limited to this.
- the main control device 120 and the coating / development control device 62 may send only information related to the maintenance work timing (timing) and the contents of the maintenance work to the host computer 90.
- the power of performing the maintenance of the exposure apparatus 10 and the maintenance of the CZD50 in a coordinated manner is not limited to this.
- the maintenance work of the C / D50 Any operation that is necessary for maintaining the performance of the exposure apparatus 10 and that requires stopping the apparatus may be performed in cooperation with the above.
- the exposure apparatus 10 (main control apparatus 120) and CZD50 (coating / development control apparatus 62) and the host computer 90 transmit and receive the information via a communication line.
- this communication line information may be exchanged using wireless, infrared, etc. as well as a wired line such as a normal communication line and a serial communication line.
- a wired line such as a normal communication line and a serial communication line.
- an empty line of an existing signal line may be used.
- serial communication it is only necessary to add the above information to the signal (or information) that has been exchanged in the past.
- the present invention is not limited to this and the substrate processing apparatus.
- An exposure apparatus may be directly connected.
- the case where the substrate processing apparatus is a CZD connected inline to the exposure apparatus has been described.
- the present invention is not limited to this, and the substrate processing apparatus is connected inline to the exposure apparatus.
- a developing device (developer) or a resist coating device (coater) may be used.
- the maintenance work (operation) of the exposure apparatus 10 and the calibration work (operation) are performed as at least a part of the maintenance work (operation) of the CZD50. Although it is executed in parallel, it is connected to the exposure apparatus 10 and is executed in parallel with at least a part of maintenance work (operation) and calibration work (operation) of another apparatus. May be.
- the laser apparatus 1 connected to the exposure apparatus 10 is not limited to the gas exchange as described above.
- Japanese Patent Laid-Open No. 10-275951 and the corresponding US Pat. No. 6,219,367 As disclosed, it is necessary to replace optical parts and electrical parts such as discharge electrodes, as described above, and in parallel with at least a part of these maintenance operations (operations), the exposure apparatus 10 Among the operations (operations) a to n, at least one operation (operation) that does not use the laser beam from the laser device 1 can be executed.
- the force described in the case where the present invention is applied to the single wafer stage type step-and-scan type projection exposure apparatus connected inline to the CZD 50.
- the present invention is not limited to a twin wafer stage type step-and-scan type projection exposure apparatus, but also to other exposure apparatuses such as a step-and-repeat type projection exposure apparatus or a proximity type exposure apparatus. It can be applied. Further, the present invention can also be applied to an exposure apparatus using an immersion method as disclosed in WO99 / 49504.
- the use of the exposure apparatus is not limited to semiconductor manufacturing, but an exposure apparatus for liquid crystal that transfers a liquid crystal display element pattern onto a rectangular glass plate, a display apparatus such as a plasma display or an organic EL, and a thin film magnetic device It can be used to manufacture heads, image sensors (CCD, etc.), micromachines, DNA chips, etc.
- the exposure apparatus is a glass substrate for manufacturing a reticle or mask used in a light exposure apparatus, EUV exposure apparatus, X-ray exposure apparatus, electron beam exposure apparatus, and the like that are only connected to a micro device such as a semiconductor element.
- it may be an exposure apparatus that transfers a circuit pattern to a silicon wafer or the like.
- FIG. 5 shows a flowchart of a manufacturing example of a device (a semiconductor chip such as an IC or LSI, a liquid crystal panel, a CCD, a thin film magnetic head, a micromachine, etc.).
- a device a semiconductor chip such as an IC or LSI, a liquid crystal panel, a CCD, a thin film magnetic head, a micromachine, etc.
- step 401 design step
- step 402 mask manufacturing step
- a wafer manufacturing step a wafer is manufactured using a material such as silicon.
- step 404 wafer processing step
- step 405 device assembly step
- step 405 includes processes such as a dicing process, a bonding process, and a packaging process (chip encapsulation) as necessary.
- step 406 inspection step
- inspections such as an operation confirmation test and a durability test of the device fabricated in step 405 are performed. After these processes, the device is completed and shipped.
- FIG. 6 shows a detailed flow example of step 404 in the case of a semiconductor device.
- step 411 oxidation step
- step 412 CVD step
- step 413 electrode formation step
- step 414 ion implantation step
- ions are implanted into the wafer.
- the post-processing step is executed as follows.
- step 415 resist formation step
- step 416 exposure step
- step 417 development step
- the exposed wafer is developed.
- the processing in steps 415 to 417 is performed by the lithography system 100 of the above embodiment.
- step 418 etching step
- step 419 resist removal step
- the lithography system of each of the above-described embodiments is used in the processing steps (about lithographic steps) of Steps 415 to 417, and between the exposure apparatus 10 and the CZD 50 Because maintenance information is exchanged and downtime is reduced, device productivity can be improved. Especially when using a vacuum ultraviolet light source such as an F laser light source as an exposure light source.
- the production rate can be improved.
- the exposure apparatus, operation determination method, substrate processing system, maintenance management method, and device manufacturing method of the present invention are suitable for the production of microdevices.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2006532655A JPWO2006025302A1 (ja) | 2004-08-30 | 2005-08-29 | 露光装置、動作決定方法、基板処理システム及びメンテナンス管理方法、並びにデバイス製造方法 |
US11/660,906 US7692764B2 (en) | 2004-08-30 | 2005-08-29 | Exposure apparatus, operation decision method, substrate processing system, maintenance management method, and device manufacturing method |
EP05781039A EP1796145A4 (en) | 2004-08-30 | 2005-08-29 | EXPOSURE DEVICE, OPERATION DECISION METHOD, SUBSTRATE PROCESSING SYSTEM, MAINTENANCE MANAGEMENT METHOD, AND DEVICE MANUFACTURING METHOD |
Applications Claiming Priority (2)
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JP2004249395 | 2004-08-30 | ||
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US (1) | US7692764B2 (ja) |
EP (1) | EP1796145A4 (ja) |
JP (1) | JPWO2006025302A1 (ja) |
KR (1) | KR20070048697A (ja) |
CN (1) | CN101002301A (ja) |
WO (1) | WO2006025302A1 (ja) |
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JP2007208182A (ja) * | 2006-02-06 | 2007-08-16 | Tokyo Electron Ltd | 処理装置における処理器具の交換方法及び交換用プログラム |
JP2007281455A (ja) * | 2006-04-04 | 2007-10-25 | Asml Netherlands Bv | リソグラフィ処理セルおよびデバイス製造方法 |
JP2008153631A (ja) * | 2006-11-08 | 2008-07-03 | Integrated Dynamics Engineering Gmbh | 組み合わせ動作制御システム |
JP2008124380A (ja) * | 2006-11-15 | 2008-05-29 | Nikon Corp | 電子部品の製造方法及びデバイス製造方法並びに電子部品の製造システム |
JP2009076579A (ja) * | 2007-09-19 | 2009-04-09 | Nikon Corp | 物体処理システム、物体処理方法、露光装置、露光方法、塗布現像装置、塗布現像方法及びデバイス製造方法 |
JP2009076580A (ja) * | 2007-09-19 | 2009-04-09 | Nikon Corp | 物体処理システム、物体処理方法、処理装置、基板処理方法及びデバイス製造方法 |
CN104216236A (zh) * | 2014-08-22 | 2014-12-17 | 深圳市大川光电设备有限公司 | 适合影像转移曝光机的菲林与工件密着方法 |
JP2018190841A (ja) * | 2017-05-08 | 2018-11-29 | キヤノン株式会社 | 基板処理装置、基板処理システムおよび物品製造方法 |
JP7033855B2 (ja) | 2017-05-08 | 2022-03-11 | キヤノン株式会社 | 基板処理装置、基板処理システムおよび物品製造方法 |
WO2020031301A1 (ja) * | 2018-08-08 | 2020-02-13 | ギガフォトン株式会社 | リソグラフィシステムのメインテナンス管理方法、メインテナンス管理装置、及びコンピュータ可読媒体 |
JPWO2020031301A1 (ja) * | 2018-08-08 | 2021-08-02 | ギガフォトン株式会社 | リソグラフィシステムのメインテナンス管理方法、メインテナンス管理装置、及びコンピュータ可読媒体 |
US11353801B2 (en) | 2018-08-08 | 2022-06-07 | Gigaphoton Inc. | Maintenance management method for lithography system, maintenance management apparatus, and computer readable medium |
JP7258028B2 (ja) | 2018-08-08 | 2023-04-14 | ギガフォトン株式会社 | リソグラフィシステムのメインテナンス管理方法、メインテナンス管理装置、及びコンピュータ可読媒体 |
Also Published As
Publication number | Publication date |
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JPWO2006025302A1 (ja) | 2008-05-08 |
EP1796145A1 (en) | 2007-06-13 |
KR20070048697A (ko) | 2007-05-09 |
EP1796145A4 (en) | 2010-10-06 |
CN101002301A (zh) | 2007-07-18 |
US20070252966A1 (en) | 2007-11-01 |
US7692764B2 (en) | 2010-04-06 |
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