WO2006019166A1 - アライメント情報表示方法とそのプログラム、アライメント方法、露光方法、デバイス製造方法、表示システム、表示装置、プログラム及び測定/検査装置 - Google Patents
アライメント情報表示方法とそのプログラム、アライメント方法、露光方法、デバイス製造方法、表示システム、表示装置、プログラム及び測定/検査装置 Download PDFInfo
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- WO2006019166A1 WO2006019166A1 PCT/JP2005/015169 JP2005015169W WO2006019166A1 WO 2006019166 A1 WO2006019166 A1 WO 2006019166A1 JP 2005015169 W JP2005015169 W JP 2005015169W WO 2006019166 A1 WO2006019166 A1 WO 2006019166A1
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- 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
- H01L21/68—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 for positioning, orientation or alignment
- H01L21/682—Mask-wafer alignment
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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
- G03F7/70605—Workpiece metrology
- G03F7/70616—Monitoring the printed patterns
- G03F7/70633—Overlay, i.e. relative alignment between patterns printed by separate exposures in different layers, or in the same layer in multiple exposures or stitching
-
- 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
- G03F9/00—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically
- G03F9/70—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically for microlithography
- G03F9/7003—Alignment type or strategy, e.g. leveling, global alignment
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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
- G03F9/00—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically
- G03F9/70—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically for microlithography
- G03F9/7003—Alignment type or strategy, e.g. leveling, global alignment
- G03F9/7046—Strategy, e.g. mark, sensor or wavelength selection
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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
- G03F9/00—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically
- G03F9/70—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically for microlithography
- G03F9/7092—Signal processing
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B15/00—Systems controlled by a computer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/80—Management or planning
Definitions
- Alignment information display method and program thereof alignment method, exposure method, device manufacturing method, display system, display device, program, and measurement Z inspection device
- the present invention relates to a lithography process in manufacturing an electronic device (hereinafter simply referred to as an electronic device) such as a semiconductor element, a liquid crystal display element, an imaging element such as a CCD, a plasma display element, or a thin film magnetic head.
- an electronic device such as a semiconductor element, a liquid crystal display element, an imaging element such as a CCD, a plasma display element, or a thin film magnetic head.
- the present invention relates to a measurement Z inspection apparatus that outputs a program for display and data to be used for such display.
- a alignment method for determining the position of a wafer or the like based on conditions and parameters set based on the displayed information, an exposure method for performing exposure by aligning using the alignment method, and a device using the exposure method The present invention relates to a manufacturing method and a display system for displaying information related to a desired process in a desired form.
- an exposure apparatus such as a step 'and' repeat method or a step 'and' scan method, a wafer prober, or a laser repair device is used.
- This reference position is, for example, the position of a cache processing point or the like that is defined for each apparatus, and is defined in a stationary coordinate system that defines the movement of the substrate to be processed and its position. It is done. Specifically, it is defined in, for example, an orthogonal coordinate system defined by a laser interferometer.
- a substrate such as a semiconductor wafer or a glass plate
- a projection position of a pattern formed on a mask or a reticle hereinafter simply referred to as a reticle. It is necessary to carry out with high accuracy and stability.
- a reticle a reticle
- Transfer circuit patterns (reticle patterns) of 10 layers or more. Therefore, if the overlay accuracy between the layers is poor, the characteristics of the formed circuit are deteriorated. In the worst case, the semiconductor element becomes a defective product, and the yield is lowered as a whole.
- wafer alignment is performed in which alignment is performed using marks previously arranged in each shot area on the wafer. That is, alignment marks are arranged in advance in each of a plurality of shot areas on the wafer.
- the position (coordinate value) in the stage coordinate system (stationary coordinate system) of the alignment mark of the shot area to be exposed is first detected. Based on the alignment mark position information and the reticle pattern position information measured in advance, the shot area is aligned with the reticle pattern.
- Patent Document 1 Japanese Patent Application Laid-Open No. 61-44429
- Patent Document 2 Japanese Patent Laid-Open No. 62-84516
- the EGA method only a plurality of shot areas previously selected as specific shot areas (sometimes referred to as “sample shot areas” or “alignment shiyot areas”) on a single wafer are used. Measure the position coordinates.
- the number of the specific shot areas is required to be 3 or more, and usually about 7 to 15.
- the position coordinates (array of shot areas) of all shot areas on the wafer are calculated using statistical calculation processing such as the least square method. Then, according to the calculated shot area arrangement, Ueno, stepping the stage. Therefore, the EGA method has the advantages that the measurement time is short and the averaging effect can be expected for random measurement errors.
- EGA EGA wafer alignment
- Equation (1) For example, a model as shown in Equation (1) is assumed.
- parameters a, b, c, d, e, and f that minimize the value ⁇ in equation (2) are calculated. Based on the calculated parameters a to f and the design arrangement coordinates (Xn, Yn), the arrangement coordinates of all shot areas on the wafer are calculated.
- the EGA method is a linear first-order approximation of the design position and the actual position specified on the wafer, and corrects the linear component of deviation such as wafer expansion / contraction and rotation. Can do.
- An object of the present invention is to efficiently evaluate and analyze measurement result data with respect to the result of actual alignment, and as a result, to set effective alignment conditions and parameters.
- An alignment information display method, alignment information display program, display device, and display program are provided.
- Another object of the present invention is to provide an alignment method capable of performing high-precision positioning using effective alignment conditions and parameters set based on measurement results with respect to actual alignment results. is there.
- Another object of the present invention is to provide a measurement Z inspection apparatus that outputs data for such display.
- Another object of the present invention is to provide an exposure method capable of performing exposure with good overlay accuracy by performing alignment of such a method. Furthermore, another object of the present invention is to provide a device manufacturing method capable of manufacturing a high-quality electronic device by applying an exposure process with good overlay accuracy.
- Another object of the present invention is to enable efficient analysis and evaluation of measurement result data with respect to the result of predetermined processing such as alignment, thereby enabling effective conditions and the like to be set. It is to provide a display system that can be performed.
- the alignment information display method is a method for displaying information related to alignment measurement for positioning an object, in which data of a predetermined processing result related to the alignment measurement is input.
- a process (step S101), a process in which information relating to the alignment measurement parameters is input (step S102), and a desired display target based on the input processing result data based on the input parameters. (Steps S103, S104), and a step of displaying the obtained desired display target information in a predetermined display form in which the influence of the parameters related to the alignment measurement on the alignment measurement is clearly indicated.
- Steps S108, S109, S112 See Figure 4
- the EGA calculation model Processing result data such as measurement result data and overlay exposure measurement result data is processed to obtain information about the desired display target. Then, the obtained information is displayed in a display form in which the influence of information such as input calculation parameters is clearly indicated. Therefore, by setting a desired condition, it is possible to easily confirm the analysis result based on the set condition, in other words, the influence of the set condition. As a result, the user can easily detect the optimal alignment conditions and parameters.
- the alignment information display method includes a process of receiving an input of an evaluation target (step S105), a process of receiving an input of a display unit (step S106), and a desired display form. (Steps S107, S108, S109, SILL), and the display step (steps S108, S109, SI12) includes the desired display pair determined above.
- Elephant information is displayed in the designated display form so that the inputted evaluation object can be evaluated in the unit of the inputted display unit. (See Figure 4)
- the alignment measurement value, the alignment correction value, the residual component after the alignment correction, the alignment mark waveform, and the desired information to be evaluated are detected. For example, every predetermined multiple lots, every single lot, every predetermined multiple wafers, every single wafer, every shot of treatment, every single shot, every predetermined number of marks or every single mark,
- a desired evaluation unit can be displayed as a unit.
- numerical data display, vector data display, statistical display such as histogram 'scatter chart, trend graph, sort result display or waveform data display that is, evaluation of these evaluation objects can be performed easily. It is possible to display in such a desired form. Therefore, the user can perform analysis and evaluation more efficiently, and can efficiently detect the optimum alignment conditions and parameters.
- the alignment information display method includes a step of inputting information relating to the alignment measurement simulation (step S103), and if necessary, based on the input information relating to the simulation. And a step of performing a predetermined simulation (Step S104), and the step of displaying (S108, S109) includes at least one of the result of the simulation and the information of the desired display target obtained. One of them is displayed so that the input evaluation unit can be evaluated in the specified display form with the input display unit as a unit.
- step S109 includes the results of the plurality of simulations or the obtained desired information.
- the display target information is compared and displayed so that the input evaluation target can be evaluated in the specified display form with the input display unit as a unit.
- the alignment information display method includes a step of inputting information relating to the display of the history information of the alignment measurement (step S111), and the step of displaying (step S112). Based on the information relating to the display of the input history information, the alignment measurement history information is further displayed as necessary. (See FIG. 4) According to such a configuration, in addition to processing results and simulation data, for example, parameter parameters, measurement status, measurement error information, and the like can be displayed. Therefore, when a waveform detection error occurs or when there is a jump in the measurement result, the analysis can be performed efficiently. “Jump” refers to data that is significantly different from others.
- the alignment information display program is a program for causing a computer to display information related to alignment measurement for positioning an object, and is a predetermined process related to the alignment measurement.
- a step in which result data is input a step in which information related to the parameters related to the alignment measurement is input, and a desired display from the input processing result data based on the input parameters.
- the alignment method according to the present invention determines parameters related to alignment measurement based on the information related to alignment measurement displayed by the above-described alignment information display method described in the above-mentioned misalignment. Alignment measurement is performed using the measured parameters, and the object is positioned.
- An exposure method is an exposure method for transferring a predetermined pattern to each of a plurality of regions formed on a substrate, and the plurality of regions on the substrate using the alignment method described above. Aligned each with the predetermined pattern and aligned The predetermined pattern is transferred to the region.
- the device manufacturing method according to the present invention includes a step of transferring a device pattern onto a device substrate using the exposure method described above.
- the display system according to the present invention is a display system for displaying a function evaluation result related to a predetermined function of a predetermined device, and is connected to the predetermined device so as to be able to transmit information, and has been processed by the predetermined device in the past.
- a storage device for storing information on processing results, a first input device for inputting a use condition when using the predetermined function, and the storage device and the first input device connected to be able to transmit information;
- a simulation device for simulating a processing result when the predetermined function is executed under the use condition input from the first input device based on a processing result in the predetermined device stored in a storage device;
- a display device for displaying a simulation result by the simulation device, and a display state when the simulation result is displayed on the display device. Choose from prepared a plurality of display states and a second input device for instructing.
- the display device is a display device that displays information related to the calculation result of alignment, a plurality of display form powers, a setting screen for selecting and setting an arbitrary display form, and the setting An arithmetic device connected to the screen and executing an operation related to alignment; and a result display screen connected to the arithmetic device and displaying information related to the execution result of the operation in a display form set on the selection screen.
- the program according to the present invention includes a step of displaying a setting screen for selecting and setting an arbitrary display form from a plurality of display forms, a step of executing a calculation related to alignment, and an alignment calculation result And a step of causing the computer system to execute the step of displaying the information on the display form set on the setting screen.
- the measurement Z inspection apparatus is a measurement Z inspection apparatus that detects information relating to the overlapping state of different layers formed on a substrate, and the detected information is A step of displaying a setting screen for selecting and setting an arbitrary display form from a plurality of display forms, a step of executing an operation relating to alignment, and a display form in which information relating to the alignment operation result is set on the setting screen
- the computer system by a program for causing the computer system to execute the step of displaying in This is a measurement z-inspection device that outputs as data used for calculations in
- a device manufacturing method capable of manufacturing a high-quality electronic device can be provided by applying an exposure process with good overlay accuracy.
- a display system that can efficiently analyze and evaluate measurement result data with respect to a result of performing a predetermined process such as alignment, thereby enabling effective conditions and the like to be set. it can.
- FIG. 1 is a diagram showing a configuration of an exposure system according to an embodiment of the present invention.
- FIG. 2 is a view showing the arrangement of the exposure apparatus of the exposure system shown in FIG.
- FIG. 3 is a diagram showing the configuration of the alignment system of the exposure apparatus shown in FIG.
- FIG. 4 is a flowchart showing an alignment data evaluation sequence.
- FIG. 5 is a diagram for explaining vector correlation.
- FIG. 6 is a diagram showing an example of a wafer vector map.
- FIG. 7 is a diagram showing an example of an EGA parameter setting screen for FIA.
- FIG. 8 is a diagram showing an example of an EGA parameter setting screen for LSA.
- FIG. 9 is a diagram showing an example of a setting screen for wafer exposure condition (overlay condition) parameters.
- FIG. 10 is a view showing a display output example of information according to the present invention, and is a view showing a wafer alignment mark map display screen.
- FIG. 11 is a diagram showing an example of information display output according to the present invention, showing a screen showing alignment mark positions and a waveform data comparison diagram.
- FIG. 12 is a diagram showing an example of information output according to the present invention, and is a diagram showing a screen on which a vector map and a histogram comparison diagram are displayed.
- FIG. 13 is a diagram showing a display output example of information according to the present invention, and is a diagram showing a screen on which a vector superposition map of residual components after alignment correction is displayed.
- FIG. 14 is a diagram showing a display output example of information according to the present invention, and is a diagram showing a screen on which a residual component vector difference map after alignment correction is displayed.
- FIG. 15 is a diagram showing a display output example of information according to the present invention, and is a diagram showing a screen on which a residual component vector correlation map after alignment correction is displayed.
- FIG. 16 is a view showing a display output example of information according to the present invention, and is a view showing a screen on which numerical values of residual component shot data after alignment correction are displayed.
- FIG. 17 is a diagram showing an example of display output of information according to the present invention, in which the wafer average and 3 ⁇ of residual components after alignment correction can be compared numerically for each calculation parameter setting.
- FIG. 17 is a diagram showing an example of display output of information according to the present invention, in which the wafer average and 3 ⁇ of residual components after alignment correction can be compared numerically for each calculation parameter setting.
- FIG. 18 is a diagram showing a display output example of information according to the present invention, and is a diagram showing an EGA parameter calculation result comparison display screen.
- FIG. 19 is a view showing a display output example of information according to the present invention, and is a view showing a shot data list display screen.
- FIG. 20 is a diagram showing an example of display output of information according to the present invention. It is a figure which shows the scatter diagram which shows the correlation with a rice level and a mark detection offset.
- FIG. 21 is a view showing a display output example of information according to the present invention, and is a view showing a contour display screen of a scalar map.
- FIG. 22 is a view showing a display output example of information according to the present invention, and is a view showing a bar graph display screen of a scalar map.
- FIG. 23 is a flowchart for explaining a device manufacturing method according to the present invention.
- FIGS. 1 to 23 An embodiment of the present invention will be described with reference to FIGS. 1 to 23.
- the present invention will be described by taking an exposure system having an exposure apparatus and an alignment data evaluation system as an example.
- FIG. 1 is a diagram showing the overall configuration of exposure system 100 according to the present embodiment.
- the exposure system 100 includes N exposure apparatuses 200-l to 200-n, an overlay measurement apparatus 130, and a host computer 140. These devices are connected to each other via a LAN 110 so that data can be transferred between them.
- the LAN 110 may be further connected to another processing device, a measuring device, a computer, or the like so as to be able to transfer data.
- the exposure apparatus 200 aligns each shot area using the EGA method.
- the EGA system here is the same as described above.
- the exposure apparatus 200 is connected to a host computer 140 that controls the entire exposure system 100 via the LAN 110, and sequentially processes wafers for each mouth based on instructions from the host computer 140.
- the exposure apparatus 200 is provided with alignment conditions and various parameters (hereinafter collectively referred to as alignment conditions (alignment conditions)) used when aligning the wafer and shot area from the host computer 140.
- alignment conditions various parameters used when aligning the wafer and shot area from the host computer 140.
- the exposure apparatus 200 aligns the wafer and the shot area based on the alignment conditions!
- the alignment conditions include the number and arrangement of sample shots, gain adjustment of the imaging device when capturing the alignment mark image, and analysis of the waveform of the acquired alignment mark image. Waveform processing algorithms to be used, and calculation formulas used for EGA calculations.
- the alignment conditions provided by the host computer 140 are determined in advance by an operator using the alignment data evaluation system on the host computer 140 to analyze and evaluate information related to the alignment. Therefore, the exposure apparatus 200 provides the alignment data evaluation system on the host computer 140 with the data of the alignment result by the EGA method performed by the exposure apparatus 200 as necessary.
- the data of the result of alignment by the EGA method is also called EGA log data.
- the detected image is processed with a predetermined algorithm. Processing results (e.g., the position of the intersection between the predetermined threshold value and the mark waveform, the position information corresponding to the sample shot determined based on this), the position information of each shot calculated by EGA calculation, etc.
- the exposure apparatus 200 is a step-and-scan projection exposure apparatus (hereinafter referred to as a scanning exposure apparatus), but a step-and-repeat projection exposure apparatus (stepper). It ’s okay! ,.
- the overlay measurement device 130 measures the overlay error of the wafer on which the pattern is formed by the exposure device 200.
- Overlay measuring device 130 receives a wafer on which a pattern is formed after exposure processing, detects a measurement mark image (for example, a resist image) formed on the input wafer, and detects marks formed on different layers. Find the relative position difference between them and detect this as an overlay error.
- a measurement mark image for example, a resist image
- the overlay measurement device 130 outputs the detected overlay measurement result to the host computer 140 via the LAN 110. Similar to the EGA log data detected by the exposure apparatus 200, the overlay measurement result data is provided to the alignment data evaluation system on the host computer 140, and is used to obtain alignment conditions and the like. For EG A log data, this overlay measurement result data is called overlay measurement log data.
- the host computer 140 is a computer having a large-capacity storage device and an arithmetic processing unit, and comprehensively controls the entire lithography process in the exposure system 100.
- This large-capacity storage device stores information necessary for overall control of the entire process.
- the host computer 140 reports the processing results of each device constituting the exposure system 100, and the reported information is stored in the mass storage device.
- the exposure apparatuses 200-l to 200-n are controlled and managed so that each lot is appropriately processed.
- the host computer 140 implements an alignment data evaluation system in order to obtain alignment conditions in alignment processing for each exposure apparatus 200-i.
- various processes related to the alignment process of the exposure apparatus 200 are aggregated, and the resulting information is displayed and output in a desired format according to the operator's request. Helps determine event conditions.
- EGA log data measured by an exposure apparatus or overlay measurement log data measured by an overlay measurement apparatus.
- EGA log data includes image data when a mark corresponding to a sample shot selected from a plurality of shots on the substrate is detected, and processing results when the detected image is processed with a predetermined algorithm (for example, a predetermined threshold value and a mark waveform). And the position information of each shot calculated by EGA calculation, etc.), and the mark position information corresponding to the sample shot determined based on this.
- the overlay measurement log data is obtained by loading the substrate on which the pattern is exposed after controlling the wafer position based on the information obtained by EGA, and loading it onto the overlay measurement device.
- the overlay result data includes overlay errors caused by non-alignment systems, such as errors due to stage control accuracy and projection imaging. It can be said that the data includes errors due to characteristics.
- the host computer 140 displays the EGA log data measured by the exposure apparatus 200 or the overlay measurement log data measured by the overlay measurement apparatus 130 according to the calculation parameters specified by the operator. Aggregation processing is performed on a unit basis, that is, analysis is performed, and information on a desired display form designated by an operator that can easily evaluate the evaluation target is generated and displayed to the operator.
- the host computer 140 performs simulations such as EGA simulation and overlay simulation as necessary, and uses them as new analysis data or comparison data, or to the operator. Display output.
- the analysis data and comparison data will be described in detail later.
- the host computer 140 can use various information related to process control and various parameters or exposure history data when obtaining EGA log data and overlap measurement log data from the accumulated information. Etc., and used for analysis and evaluation of alignment conditions, or display and output to workers as comparison information and reference information.
- the operator evaluates the conditions set based on the displayed information while sequentially changing the calculation parameters and the like with the host computer 140, for example, using an interactive interface, and finally the alignment condition most suitable. Is detected.
- the detected condition conditions are set in the exposure apparatus 200 via the LAN 110 and applied to actual wafer processing.
- the alignment data evaluation system realized on the host computer 140 is an operation including analysis and evaluation of alignment information for determining such alignment conditions, and display and output of information in a desired form.
- this alignment data evaluation system is realized by loading and executing a predetermined program including the alignment information display program according to the present invention on the host computer 140.
- the program may be installed in a stand-alone computer system instead of a host computer connected to the exposure apparatus via a LAN. In this case, EGA log data and overlap measurement log data are input to a stand-alone computer system using a recording medium.
- FIG. 2 is a diagram showing a schematic configuration of an exposure apparatus 200 that is a scanning exposure apparatus.
- the exposure apparatus 200 controls the illumination system 210, the reticle stage RST that holds the reticle R as a mask, the projection optical system PL, the wafer stage WST on which the wafer W as a substrate is mounted, the alignment system AS, and the entire apparatus. It has a main control system 220 for controlling.
- the illumination system 210 is a light source, a fly-eye lens or a rod integrator (an internal reflection type integrator) as an optical integrator, as disclosed in, for example, JP-A-10-112433 and JP-A-6-349701. ) Etc., including a uniform illumination optical system, relay lens, variable ND filter, reticle blind, dichroic mirror, etc. (all not shown).
- the illumination system 210 has a reticle R on the reticle R on which a circuit pattern and the like are drawn. Illuminate the slit-shaped illumination area defined by the chickle blind with illumination light IL with almost uniform illuminance.
- the illumination light IL includes far ultraviolet light such as KrF excimer laser light (wavelength 248 nm), vacuum ultraviolet light such as Ar F excimer laser light (wavelength 193 nm), F laser light (wavelength 157 nm),
- ultraviolet lines g-line, i-line, etc.
- an ultra-high pressure mercury lamp Alternatively, use ultraviolet lines (g-line, i-line, etc.) from an ultra-high pressure mercury lamp.
- Reticle stage RST On reticle stage RST, reticle R force is fixed, for example, by vacuum suction.
- Reticle stage RST is used to position reticle R by means of a reticle stage drive unit (not shown) made up of, for example, a magnetically levitated two-dimensional linear actuator, so that the optical axis of illumination system 210 (the light of projection optical system PL described later) It can be driven slightly in the XY plane perpendicular to the axis AX) and can be driven at the scanning speed specified in the predetermined scanning direction (here, the Y-axis direction).
- a reticle stage drive unit made up of, for example, a magnetically levitated two-dimensional linear actuator, so that the optical axis of illumination system 210 (the light of projection optical system PL described later) It can be driven slightly in the XY plane perpendicular to the axis AX) and can be driven at the scanning speed specified in the predetermined scanning direction (here, the Y
- the magnetically levitated two-dimensional linear actuator of the present embodiment is provided with a Z driving coil in addition to the X driving coil and the Y driving coil, and the reticle stage RST is mounted on the Z axis. It is configured to be capable of minute driving in the direction.
- the position of the reticle stage RST in the stage moving plane is determined by a reticle laser interferometer (hereinafter referred to as a reticle interferometer) 216 via a moving mirror 215, for example, with a resolution of about 0.5 to Lnm. Always detected. Position information of reticle stage RST from reticle interferometer 216 is supplied to stage control system 219 and main control system 220 via this. In response to an instruction from main control system 220, stage control system 219 drives and controls reticle stage RST via a reticle stage drive unit (not shown) based on position information of reticle stage RST.
- a reticle laser interferometer hereinafter referred to as a reticle interferometer
- a pair of reticle alignment systems 222 (a reticle alignment system on the back side of the drawing is not shown) is arranged.
- the pair of reticle alignment systems 222 captures an epi-illumination system for illuminating the detection target mark with illumination light having the same wavelength as the illumination light IL, and an image of the detection target mark.
- the alignment microscope includes an imaging optical system and an imaging device, and the imaging result of the alignment microscope is supplied to the main control system 220. In this case, the detection light from the reticle R is guided to the reticle alignment system 222.
- a deflection mirror (not shown) is movably arranged, and when an exposure sequence is started, the deflection mirror is integrated with the reticle alignment system 222 by a driving device (not shown) in response to a command from the main control system 220. Is retracted outside the optical path of the illumination light IL.
- Projection optical system PL is arranged below reticle stage RST in FIG. 2, and the direction of optical axis AX is the Z-axis direction.
- the projection optical system PL for example, a double-sided telecentric reduction system is used.
- the projection magnification of the projection optical system PL is, for example, 1Z4, 1Z5 or 1Z6. For this reason, when the illumination area of the reticle R is illuminated by the illumination light IL from the illumination system 210, the circuit of the reticle R in the illumination area is passed through the projection optical system PL by the illumination light IL that has passed through the reticle R.
- a reduced image (partial inverted image) of the pattern is formed on the wafer W having a resist (photosensitive agent) coated on the surface.
- a refractive system in which only a plurality of, for example, about 10 to 20 refractive optical elements (lens elements) 213 are used is used.
- a plurality of lens elements 213 constituting the projection optical system PL a plurality of lens elements on the object plane side (reticle R side) are driven in the Z-axis direction (not shown) by a drive element such as a piezo element ( This is a movable lens that can be driven to shift in the optical axis direction of the projection optical system PL) and in the tilt direction with respect to the XY plane (that is, the rotation direction around the X axis and the rotation direction around the Y axis).
- the imaging characteristic correction controller 248 independently adjusts the voltage applied to each driving element based on an instruction from the main control system 220, whereby each movable lens is driven individually, and the projection optical system PL Various imaging characteristics (magnification, distortion, astigmatism, coma, curvature of field, etc.) are adjusted.
- the imaging characteristics correction controller 248 can control the light source to shift the center wavelength of the illumination light IL, and can adjust the imaging characteristics by shifting the center wavelength in the same manner as the movement of the movable lens. .
- Wafer stage WST is arranged on a base (not shown) below projection optical system PL in FIG.
- Wafer holder 225 is mounted on wafer stage WST, and wafer W is fixed on wafer holder 225 by, for example, vacuum suction.
- Wafer holder 225 can be tilted in an arbitrary direction with respect to a plane perpendicular to the optical axis of projection optical system PL by a drive unit (not shown), and in the optical axis AX direction (Z-axis direction) of projection optical system PL. Is also configured to be finely movable. Further, the wafer holder 225 can also perform a minute rotation around the optical axis AX.
- Wafer stage WST not only moves in the scanning direction (Y-axis direction), but also allows a plurality of shot regions on wafer W to be positioned in an exposure region conjugate with the illumination region. It is also configured to be movable in the non-scanning direction (X-axis direction) perpendicular to the axis, and the scanning exposure operation for each shot area on the wafer W and the start of acceleration for the next shot area exposure Repeat step-and-scan operation to move to position.
- This wafer stage WST is driven in the XY two-dimensional direction by a wafer stage driving unit 224 including, for example, a linear motor.
- the position of the wafer stage WST in the XY plane is always detected by the wafer laser interferometer system 218 through a moving mirror 217 provided on the upper surface thereof, for example, with a resolution of about 0.5 to about Lnm. ing.
- a Y moving mirror having a reflecting surface orthogonal to the scanning direction (Y direction) and an X moving mirror having a reflecting surface orthogonal to the non-scanning direction (X axis direction) are provided on wafer stage WST.
- the wafer laser interferometer 218 is also provided with a Y interferometer that irradiates an interferometer beam perpendicularly to the Y moving mirror and an X interferometer that irradiates the interferometer beam perpendicularly to the X movable mirror. . (In FIG.
- the stationary coordinate system that defines the moving position of the wafer stage WST is It is defined by the measurement axis of the Y interferometer and X interferometer of the wafer laser interferometer system 218. (Hereafter, this stationary coordinate system may be referred to as the “stage coordinate system”)
- reflection surface of the interferometer beam described above may be formed by mirror-casting the end surface of wafer stage WST.
- Position information (or speed information) on the stage coordinate system of wafer stage WST is supplied to main control system 220 via stage control system 219.
- the stage control system 219 controls the wafer stage WST via the wafer stage driving unit 224 based on the position information (or speed information) of the wafer stage WST in accordance with an instruction from the main control system 220.
- the reference mark plate FM is fixed in the vicinity of the wafer W on the wafer stage WST. It is.
- the surface of the fiducial mark plate FM is set to the same height as the surface of the wafer W.
- a so-called baseline measurement fiducial mark for reticle alignment, a reference mark for reticle alignment, And other reference marks are formed
- an off-axis alignment system AS is provided on the side surface of the projection optical system PL.
- this alignment AS here, for example, an alignment sensor (Field Image Alignment (FIA)) disclosed in Japanese Patent Laid-Open No. 2-54103 is used.
- This alignment AS irradiates a wafer with illumination light having a predetermined wavelength width (for example, white light), and an index mark on an index plate arranged in a plane conjugate with the alignment mark image on the wafer and the wafer.
- This image is detected by forming an image on the light receiving surface of an image sensor (CCD camera, etc.) with an objective lens or the like.
- the alignment system AS outputs the imaging result of the alignment mark (and the reference mark on the reference mark plate FM) to the main control system 220.
- the exposure apparatus 200 further supplies an imaging light beam for forming a plurality of slit images toward the best imaging surface of the projection optical system PL from an oblique direction with respect to the optical axis AX direction (not shown)
- An oblique incidence type multi-point focus detection system comprising an irradiation optical system and a light receiving optical system (not shown) that receives each reflected light beam of the imaging light beam on the surface of the wafer W through a slit. It is fixed to a support (not shown) that supports the projection optical system PL.
- this multipoint focus detection system one having the same configuration as that disclosed in, for example, JP-A-5-190423, JP-A-6-283403, etc. is used, and the stage control system 219 is the multipoint focus detection system.
- the wafer holder 225 is driven in the Z-axis direction and the tilt direction.
- the main control system 20 includes an arithmetic processing system such as a microcomputer, and controls each component of the exposure apparatus in an integrated manner.
- the main control system 220 is connected to the LAN 110 described above.
- Information such as alignment conditions set from the host computer 140 is stored in a storage device such as a hard disk or a memory such as a RAM constituting the main control system 220.
- the alignment sensor AS includes a light source 341, a collimator lens 342, a beam splitter 344, a mirror 346, an objective lens 348, a condenser lens 350, an index plate 352, a first relay lens 354, and a beam splitter 356.
- X-axis second relay lens 358X X-axis image sensor 360X composed of a two-dimensional CCD
- Y-axis second relay lens 358Y X-axis image sensor 360Y composed of a two-dimensional CCD.
- the light source 341 is a non-photosensitive light that does not sensitize the photoresist on the wafer, and emits a broad wavelength distribution light having a certain bandwidth (eg, about 200 nm), in this case a halogen lamp. Is used. Broadband illumination light is used to prevent deterioration of mark detection accuracy due to thin film interference in the resist layer.
- Illumination light from the light source 341 is applied to the vicinity of the alignment mark MA on the wafer W through the collimator lens 342, the beam splitter 344, the mirror 346, and the objective lens 348.
- the reflected light from the alignment mark MA is irradiated onto the index plate 352 via the objective lens 348, mirror 346, beam splitter 344, and condenser lens 350, and an image of the alignment mark MA is formed on the index plate 352. Imaged.
- the light transmitted through the index plate 352 is directed to the beam splitter 356 via the first relay lens 354 and transmitted through the beam splitter 356.
- the second X-axis relay lens 358X causes the X-axis image sensor 360X.
- the light focused on the image pickup surface and reflected by the beam splitter 356 is focused on the image pickup surface of the Y-axis image pickup device 360Y by the second Y-axis relay lens 358Y.
- the alignment mark MA image and the index mark image on the index plate 352 are superimposed and formed.
- the imaging signals (DS) of the imaging devices 360X and 360Y are both supplied to the main control system 220.
- the measurement value of the wafer laser interferometer 218 is also supplied to the main control unit 220 via the stage control system 219. Therefore, the main control unit 220 calculates the position of the alignment mark MA on the stage coordinate system based on the imaging signal DS from the alignment sensor AS and the measurement value of the wafer laser interferometer 218.
- the alignment data evaluation system implemented on the host computer 140 to support the determination of alignment conditions, and the alignment data using the alignment data evaluation system are described.
- the display method and evaluation method of data (alignment information) will be described with reference to FIGS.
- FIG. 4 is a flowchart showing the alignment data evaluation sequence.
- alignment data alignment information
- EGA log data or overlap measurement log data to be evaluated is selected in units of files (step S101). Multiple result files to be evaluated can be specified.
- step S102 alignment conditions such as an EGA calculation model (including a higher-order model), a reject tolerance, an EGA calculation target shower, and a measurement target wafer are set (step S102).
- the EGA calculation model is a high-order calculation model that can handle non-linear components and random components of array changes, as well as model equations that handle shot array changes as a linear type as shown in Equation 1. A formula is also available.
- Reject tolerance is the detection result of the sample shot position that is subject to EGA calculation. If there is a shot with an extremely large amount of misalignment compared to other shots, whether or not the target force for EGA calculation is also excluded. Boundary condition for determining Since the EGA calculation is a statistical calculation that determines the shot position of the entire board based on a small number of sample shot position information on the board, the local misalignment is included in the small number of sample shots that are the basis of the EGA calculation. Including shots that cause erosion may adversely affect shot position information on the entire board.
- the change in the tendency of the position deviation for each substrate may be large or small. If the trend of positional deviation for each board is small, there is no problem even if the lot lot or multiple lots are aligned using the information obtained from the top of the board, but if the trend is large, the interval will be shorter. It may be better to adjust the alignment conditions.
- the wafer to be measured in the alignment condition is an alignment condition regarding the interval at which the alignment measurement or adjustment operation is performed in consideration of such a trend change.
- a signal corresponding to the mark image obtained from the image data acquired by the imaging device If you open an alignment waveform file that stores waveform data and perform an EGA simulation, set the alignment conditions such as the mark shape and signal processing conditions such as the waveform processing algorithm.
- the result of the EGA simulation is applied to the overlap measurement log data. It ’s great.
- the contents to be taken into account include changes in the EGA correction amount by EGA simulation, EGA component correction conditions (alignment correction value, EGA result selection, etc.), and processing conditions for EGA optional functions (extended EGA, weighting) EGA etc.) settings.
- the amount of change in the EGA correction amount due to the EGA simulation is calculated by performing a alignment mark waveform detection simulation, or by using the difference between the correction amounts of two different EGA measurement result files. is there.
- step S103 it is determined whether or not simulation execution is specified (step S103) or specification of execution is accepted. If simulation execution is specified or if specification is accepted, the above setting is made. A simulation is executed based on the determined conditions (step S104). At this time, it is possible to execute simulations for a plurality of conditions for the same evaluation target.
- step S103 When the execution of the simulation is not designated (step S103), the process proceeds to step S105 without executing the simulation of step S104.
- an evaluation target is selected (step S105).
- the evaluation target is the measurement value, correction value, residual component after correction, data related to the mark image or waveform, and data obtained in S104, which are included in the EGA or overlap measurement log data selected in units of files in step S101. Power of simulation results etc. are selected.
- a data display unit is set (step S106).
- Data display unit can be selected from multiple lots, single lots, multiple wafers, single wafers, multiple shots, single shots, multiple marks, or single marks in any combination And set. With this setting, for example, it is possible to specify that data for a plurality of lots is displayed for a plurality of shots in a specific area of a specific wafer. [0077] Next, it is determined whether or not execution of data comparison display is specified. If data comparison display is specified, the process proceeds to step S109. If data comparison display is not specified, the process proceeds to step S108 (step S107). .
- step S108 the evaluation target selected in step S105 is displayed in a desired display form in the data display unit set in step S106.
- the display form is appropriately selected from the form of numerical data display, vector data display, statistical display such as histogram 'scatter chart, sort result display, and waveform data display.
- the evaluation target data is numerically displayed.
- each log data file to be evaluated can be listed as it is, as well as displaying numerical values after statistical calculation according to the data display unit, descending order, It is also possible to display after sorting in ascending order. For example, if “for each single lot” is selected as the display unit, the average, variance, deviation, etc. of multiple data related to multiple boards in a single lot are determined and each lot is handled. Data is displayed for each lot as a numerical value.
- Vector display is a display form in which the direction and amount of change of a shot on a substrate are displayed as images.
- this vector display it is possible to represent the relationship between the design position of the shot, the position of the shot moved by receiving the process processing, the deviation remaining after alignment (residual error), and the like.
- the histogram is a display form in which the selected display unit is taken on the horizontal axis and the corresponding numerical data is represented by the length in the vertical axis direction of the graph. Similar to the case of numerical data display, each log data file to be evaluated can be displayed by replacing the acquired data with the length of the graph as it is, or the numerical value that has been statistically calculated according to the data display unit. It can be displayed by replacing with the length of.
- Sorting means that the evaluation data is sorted and displayed in units such as each simulation number, each mark, each shot, and each wafer in the set data display unit for the selected evaluation mode. That is, x, y, X and y, and X or y are specified and displayed in order of size.
- the scatter plot is off when the algorithm slice level is changed! / Use this when you want to see the correlation between two parameters, such as the movement of a set factor.
- a scatter plot of multiple data is displayed on one screen, applying a regression curve for each data makes it easier to understand the correlation with the slice level for each data.
- a linear line, logarithmic curve, polynomial curve, power curve, and exponential curve are selected according to the target data.
- the algorithm slice level means a certain level set for the waveform data based on the acquired mark image data.
- the mark position information can be obtained by obtaining the intersection between the constant level and the waveform data, that is, the position where the waveform data exceeds (or falls below) the predetermined level. By changing this constant level, the mark position information determined based on this may change.
- the offset factor here is equivalent to the residual error information. As described above, since the mark position information changes by changing the slice level, the residual error remaining between the actual mark position and the calculated mark position calculated by the EGA calculation also changes to the slice level. It will change accordingly.
- step S109 two or more pieces of data selected for each unit selected in step S105 and set in step S106 are selected in the data display unit set in step S106.
- Comparison display is performed according to the display form. Display format is selected as appropriate, such as numerical data display, vector data display, statistical display such as histogram / scatter chart, sort result display, waveform data display, etc.
- the EGA calculation model is changed (for example, secondary force or tertiary) for the same evaluation data file, evaluation target, and data display unit, it is compared whether there is a significant difference in alignment correction results. This comparison display is effective when analyzing.
- the data comparison display method is selected from the vector correlation method, the difference method, and the comparison (superposition) method.
- the vector correlation method uses a vector Sij and a vector Tij for each measurement point position between the reference wafer vector map pattern S and the wafer vector map pattern T to be compared. This is a method of calculating the sum of products based on the formula (3) to obtain the correlation. As a result, a correlation between the vector map S and the vector map T that takes into account both directionality and size is obtained.
- the vector S and the vector T are the evaluation target values selected in step S 105 in FIG. 4 (measurement values Z correction values Z values for each alignment mark measurement position such as residual error after correction).
- the map is displayed based on the data display unit set in step S106 of FIG.
- the vector correlation method is a method of numerically or schematically expressing the degree of similarity between two evaluation objects that can be expressed by a vector. As an example, if there is a high correlation between the position change of the origin (design position) force at the measurement position and the position change of the origin force at the calculated position obtained by EGA calculation based on the measurement value, this EGA calculation The effectiveness of can be confirmed. By obtaining the correlation between the vector map indicating the measurement position and the vector map related to the position information obtained by EGA calculation, the validity of the condition setting for EGA calculation can be enhanced. Equations (3) to (6) relate to the overall vector correlation in wafer units for multiple marks.
- the vector Sij Tij, that is, the directionality and the size of the vector map coincide with each other. If the inner product sum of Sij and Tij is 0, the vectors Sij and Tij have no correlation. A high correlation indicates that the change between the wafer vector maps is small. Conversely, a low correlation indicates a large change between wafer vector maps.
- Equation (4) the inner product sum of the vector Sij and the vector Tij obtained by Equation (3) is obtained by the size of the vector Sij obtained by Equation (5) and Equation (6). By dividing each by the magnitude of the vector Tij, the correlation coefficient C normalized for the size of the vector is obtained.
- the value of the correlation coefficient C ranges from 1 to +1. When the value is +1, the direction and magnitude of the vector
- the correlation between the wafer vector maps that is, the significant difference (change amount) between the compared data can be evaluated / determined with a certain scale.
- each wafer vector map showing the correlation between the comparison data For each measurement position, calculate a vector value based on Equation (7) and Equation (10) and display the vector map. This is a correlation value of each measurement position obtained by dividing the vector inner product sum into XY components and standardized by the magnitude of the vector.
- Equation (13) the square root of the sum of squares of Equations (7) and (10), that is, the inner product sum standardized at each measurement position shown in Equation (13), may be displayed as a solid vertical bar graph on the wafer map. good.
- Vy ⁇ (V ⁇ + V ⁇ )... (13)
- the X-direction residual component at each mark measurement position is Sxij and the Y-direction residual component is Syij. ) Is used.
- the vector correlation method makes it easy to understand and evaluate two-dimensional data because both the XY directionality and size of evaluation data are taken into account. Furthermore, by standardizing, it is possible to evaluate by taking out only the degree of change purely without depending on the absolute value that differs for each data to be compared, and to evaluate the significant difference (change) between the comparison data to a certain level. Can be determined by a scale.
- Equation (5) Equation (6)
- Equation (8) Equation (9)
- Equation (11) Equation (12)
- the data comparison display by the difference method is the selected display mode such as the set data display unit, numerical data display, vector data display, and statistical display such as histogram 'scatter chart.
- This is a method of displaying a difference between data.
- the difference between the two data can be evaluated for each measurement position in the form of a vector map display or numerical data display.
- the sum of squared differences is used as the overall evaluation scale.
- the difference width (range), variation (variance, standard deviation), and distribution between multiple data for each measurement position or data display unit Calculate (display) type (skewness and kurtosis). Skewness indicates the symmetry of the distribution and is calculated by equation (14) Is done. The kurtosis indicates the length of the distribution and is calculated by the equation (15).
- the skewness is better when the distribution is symmetric and the length of the skirt is shorter (the closer to the b force ⁇ in equation (14), the more symmetric) ) And kurtosis (preferably, the larger the b in Equation (15), the shorter the length).
- the data comparison display by the Z-overlay method displays the set data display unit in numerical data display, vector data display, statistical display such as histogram 'scatter chart, sort result display and waveform data display. According to the display form selected from the above, the specified evaluation target data is displayed in comparison or overlaid for evaluation.
- contrast display is suitable for numerical data, sorting results, and the like. Further, it is preferable that vector data, histograms, scatter diagrams, waveform data, and the like are displayed in an overlapping manner.
- step S110 when the selection of the data display form is completed in step S108 or step S109, the displayed data is evaluated and analyzed (step S110).
- the evaluation data is a correction value or a residual component after correction
- individual alignment conditions can be specified.
- the EGA calculation model is a higher-order model, up to each higher-order correction coefficient can be specified.
- correction values can be specified for each wafer and lot (average of correction values for multiple wafers).
- step S111 it is determined whether or not alignment processing history data display is specified. If specified, display of the alignment processing history data such as alignment conditions, measurement status, and measurement error information is displayed. (Step S112).
- This alignment processing history data display is effective when a waveform detection error occurs or when there is a jump in the measurement result.
- waveform detection error or measurement result jump is confirmed at the same position on multiple wafers. Therefore, checking the history data provides a clue to ascertain that the cause is on the device side.
- step S 101, S102, S105, S106, S107 or S111 change the condition to detect whether or not to perform re-evaluation 'analysis, and if re-evaluation or re-analysis is to be performed, return to the specified step position (step S 101, S102, S105, S106, S107 or S111), and the evaluation sequence is repeated (step S113).
- the alignment conditions can be efficiently evaluated and analyzed, and the alignment conditions can be optimized.
- the alignment AS shown in FIG. 3 described above is a FIA (Field Image Alignment) type alarm. Element sensor. Further, although omitted in the description of the alignment system using FIG. 3, the alignment system AS includes an alignment sensor of an LSA (Laser Step Alignment) method. Since both methods are already widely used, a detailed description thereof will be omitted.
- LSA Laser Step Alignment
- FIG. 7 is a diagram showing an EGA parameter setting screen for the FIA alignment sensor. From the setting screen 410 shown in FIG. 7, the operator sets processing conditions for the FIA mark waveform generated based on the mark image on the board acquired as image data. Specifically, for example, FIA mark shape information is set in the FIA Mark Data field 411 and signal processing conditions are set in the FIA Parameter field 412. Also, EGA simulation is executed based on the setting value from this screen.
- An example of signal processing conditions is a threshold setting method for FIA mark waveforms.
- the position force mark position information of the intersection of the waveform and the threshold value is obtained, but as to how to set this threshold value, which part of the waveform is used or where the threshold height is set You can change settings such as
- FIG. 8 is a diagram showing an EGA parameter setting screen for the LSA alignment sensor. From the setting screen 420 shown in FIG. 8, the operator sets the processing conditions for the LSA mark waveform. Specifically, for example, the LSA mark shape is set in the LSA mark data column 421, and the signal processing conditions are set in the LSA parameter column 422. Also, EGA simulation is executed based on the settings from this screen.
- FIG. 9 is a diagram showing a wafer exposure condition setting screen. From the setting screen 430 shown in FIG. 9, the operator sets wafer exposure condition parameters.
- the wafer exposure condition setting screen 430 has a wafer correction parameter setting field 431 and a shot correction parameter setting field 432. Then, from these columns, set the correction amount to be added to each wafer and shot correction factor calculated by EGA calculation, and use the fixed value without using the calculation result calculated by EGA method. Setting (when specifying the No Fix force Fix for each correction factor) and EGA result selection when using the calculated value based on the EGA parameter. The overlay simulation is executed based on the setting values from this screen.
- the wafer correction parameter is a correction amount setting for each wafer.
- the shot correction parameter is a correction amount set for each shot.
- FIG. 10 shows the alignment mark map display screen.
- the evaluation target wafer is an arbitrary wafer of an arbitrary lot selected by the operator from the EGA log data or overlap measurement log data to be evaluated.
- a desired shot is selected by performing an operation such as double-clicking the position, for example, for the shot (mark) such as waveform data, All desired detailed data (information) is displayed.
- FIG. 11 is a diagram showing a display screen that displays the alignment mark map and the waveform data.
- the screen 520 shown in FIG. 11 includes a window 510 displaying a map showing the position of the shot (mark) shown in FIG. 10 on the wafer, and a window 522 displaying waveform data of a specific alignment mark. Is displayed!
- Such a screen 520 is generated, for example, by selecting a desired shot in the alignment mark map shown in FIG. 10 as described above.
- the shot (mark) whose waveform data is shown in the 1S window 522 (not shown) is displayed in a form distinguishable from other shots (marks) in the window 510.
- the waveform data (waveform diagram) 523 of the mark to be analyzed or evaluated in any of the shots whose positions are shown in the window 510 is the waveform data ( (Waveform diagram) Displayed in a form contrasted with 524.
- the vertical line 525 in the center analyzes the waveform data with a predetermined waveform analysis algorithm. The mark center position determined by this is shown, and the measured value (deviation from the design value) is shown in the lower left of each waveform graph! / Speak.
- the waveform data 524 that has been successfully detected in the mark may be obtained by selecting the intermediate force of the yacht (mark) shown in the window 510, and the mark having the same shape as the mark to be analyzed is previously stored. It may be prepared reference data.
- waveform display can be performed for an arbitrary lot, an arbitrary wafer, and an arbitrary mark of an arbitrary shot. In this way, for example, by displaying a comparison with other waveform data such as normal waveform data, the cause of the waveform detection error can be inferred from the difference.
- the two waveform data in the window 522 may be displayed in an overlapping manner (overlapping display).
- An arbitrary display method that is easy to visually recognize can be selected and displayed according to the type and state of the waveform.
- the waveform color / thickness / shape (solid line, dotted line, etc.) may be changed between the waveforms that are displayed in comparison or superimposed.
- This display form is not limited to the comparison display of the mark waveform to be evaluated and the reference mark waveform, and can be applied to various waveform data comparisons.
- the waveform for each detection parameter change when the detection parameter is changed can be displayed in comparison or superimposed. If such a display is performed, the effect of the parameter change on the mark waveform detection position can be inferred from the difference between the two data displayed in contrast or overlaid.
- the waveform in the X direction and the waveform in the Y direction may be displayed in contrast between the same mark or any different mark.
- the mark shape parameter includes single Z double signal shape parameter specification, mark type parameter specification, mark detection allowable value parameter specification, and the like.
- Mark detection parameters include multi-mark end mark use Z non-use parameter specification, mark detection algorithm and slice level parameter specification, mark waveform edge detection mode parameter specification, and the like.
- the new mark shape parameter derived by the above analysis is, for example, the FIA mark data field 411 of the EGA parameter setting screen for FIA shown in FIG. 7 or the LSA for LSA shown in FIG.
- the LSA mark data field 421 of the EGA parameter setting screen it is reflected in later analysis, simulation, and actual processing.
- Each parameter other than the mark shape is also reflected in the subsequent EGA simulation and control of the exposure device 200.
- FIG. 12 is a diagram showing a display screen that displays a vector map of evaluation data deviation and a histogram showing the frequency distribution of deviation amounts.
- a window 531 for displaying a deviation in a vector map and a frequency distribution of the deviation amount by V in a predetermined unit such as the whole wafer are displayed.
- a window 532 displaying histograms 533 and 534 to be displayed is displayed.
- the histograms 533 and 534 displayed in the window 532 indicate how much the amount of deviation is distributed and how often the selected evaluation object is distributed.
- the X histogram is a histogram related to the amount of deviation in the X direction
- the Y histogram is a histogram related to the amount of deviation in the Y direction.
- the two histograms 533 and 534 of the window 532 may be displayed in an overlapping manner (overlapping display), for example. Any display method that is easy to view can be selected and displayed according to the type and state of the histogram.
- the color / thickness of the bar graph may be changed between the bar graphs that are displayed in contrast or overlaid.
- the wafer offset (Wafer) displayed in the correction parameter (Correction Parameters) column 535 of the window 530 is selected.
- each correction factor which factor is dominant in alignment correction, each correction factor, use of each correction factor, Z non-use setting, and addition to each correction factor and each correction factor
- the correction parameters and the like based on these determinations are set in the wafer correction (Wafer Correction) column 431 and the shot correction (Shot Correction) column 432 of the wafer exposure condition parameter setting screen shown in FIG.
- Each input parameter is reflected in the subsequent EGA simulation, control of the exposure apparatus 200, and the like.
- Fig. 13 is a diagram showing a display screen of a vector superimposition map of residual components after alignment correction.
- the screen (window) 540 shown in Fig. 13 includes the second-order EGA calculation model and the third-order EG. A vector map of residual components after alignment correction calculated for each of the two conditions with the A calculation model is displayed superimposed!
- the numerical values in the log data are compared as they are, the average between multiple wafers, 3 ⁇ , absolute value of average + 3 ⁇ , maximum value (MAX), minimum value (MIN ), Statistical information such as range (width) may be obtained by calculation, and the calculated values of multiple wafers may be compared.
- the average between multiple wafers is calculated and averaged for each high-order calculation model. Comparison between the results is possible.
- the vector length is short and the jump data is small. Also, it is preferable that the amount of deviation is distributed in the two directions of XY, not the tendency that the deviation of each mark shows a large deviation in one direction.
- Evaluation data between different lots or different wafers under the same conditions may be displayed in an overlapping manner. This makes it possible to evaluate the variation between different lots of wafers under the same conditions.
- the actual numerical value of the vector-displayed portion is output in the form of a numerical value display, for example, as shown in the display screen 570 shown in FIG. 16, for example, by switching the display mode. Is possible.
- FIG. 14 is a diagram showing a display screen of a vector difference map of residual components after alignment correction.
- the difference amounts of the residual components after alignment correction calculated for each of the two conditions of the second-order EGA calculation model and the third-order EGA calculation model are marked.
- a vector map is displayed as difference data for each position. As shown in Fig. 13, it is not necessary to display two vectors related to the residual components of the second-order model and third-order model. is there.
- evaluation data between different lots or different wafers under the same conditions may be displayed by such a vector difference map. This makes it possible to evaluate the variation between different lot wafers under the same conditions.
- this condition is selected for a specific condition.
- the residual after the alignment correction is further displayed by the vector overlay map display shown in Fig. 13, the shot data list display shown in Fig. 19, etc. It is necessary to evaluate the components and select good conditions based on evaluation criteria such as dispersion (distribution) of residual components, jump data of residual components, and the one with the smaller mean square of residual components.
- FIG. 15 is a diagram showing a screen in which the vector correlation of residual components after alignment correction is displayed as a vector map.
- the selected evaluation data file (EGA measurement result file or overlay measurement result file) and the selected evaluation object (parameter measurement value, alignment) are selected.
- the vector correlation of the evaluation data calculated for each mark when the EGA parameter and wafer exposure condition (overlay) parameters are changed can be evaluated in mark units. Therefore, it is possible to determine the degree of influence on the evaluation data when changing each parameter parameter, and to easily optimize each parameter parameter.
- the average between multiple wafers is used in each high-order calculation model. By doing so, the degree of correlation for the averaged result can be determined.
- evaluation data between different lots and different wafers under the same conditions and the same parameters may be displayed by such a vector correlation map. This makes it possible to evaluate the variation between different lots and wafers under the same conditions and the same parameters.
- the vector overlay map display and the figure shown in FIG. Evaluate the residual components after alignment correction using the shot data list display shown in Fig. 19, and determine the dispersion (distribution) of residual components, jump data of residual components, and the sum of squares of residual components. Based on the evaluation criteria such as! /, The one with a small average, the parameter of the better condition is selected.
- FIG. 16 is a diagram showing a screen in which residual components after alignment correction are numerically displayed as data relating to shots.
- This numerical display is performed, for example, when the operator selects a desired shot on the screen while displaying the vector superimposed map of residual components after alignment correction shown in FIG. It is performed by switching. As a result, the operator can grasp the residual components numerically.
- FIG. 17 is a view showing a screen in which the wafer average of the residual components after alignment correction, 3 ⁇ , and the like are compared and displayed numerically.
- the screen 580 shown in FIG. 17 displays the numerical value of the average residual component, 3 ⁇ , when alignment correction is performed under two conditions for the same wafer.
- 3 ⁇ the average residual component
- MAX maximum value
- ⁇ minimum value
- Range width
- distribution type disortion and kurtosis
- Figure 18 shows a screen that compares and displays EGA parameter calculation results using numerical values. Screen 590 shown in Figure 18 compares the results when EGA parameters are calculated under two conditions for the same wafer. It is displayed!
- FIG. 19 is a diagram showing a screen displaying a list of data related to a plurality of shots.
- the screen 600 shown in FIG. 19 displays the mark measurement results for each shot in the wafer. This In addition to the measurement result, the alignment measurement value, the alignment correction value, and the residual component after the alignment correction may be displayed.
- the display power in the wafer map format as shown in FIGS. 11 to 15 can be displayed numerically by the operator's selection operation.
- a line graph 610 shown in FIG. 20 shows the correlation between the algorithm slice level and the mark detection offset.
- the mark detection allowable value is changed from 0 m to 999.999 m when the contrast limit is changed from 0% to 100%. If you want to evaluate the result of simulation by changing the value continuously, such as when changing it, you should display such a graph.
- a graph 511 shown in FIG. 21 is a graph in which two evaluation data are displayed as contour lines as a scalar map.
- the scalar map contour display graph 620 shown in Fig. 21 shows, for example, the difference between the residual components after the alignment correction, taking the square root of the sum of squares of the X component and Y component, and the X and Y positions of the shot on the wafer. It is a figure shown as height data of the position on the graph corresponding to.
- the correlation of residual components after alignment correction is displayed as a scalar map combining the X and Y components using the value of equation (13) that is not in the vector correlation map as shown in Fig. 15. It can also be used. This is effective when comprehensive evaluation is performed using the combined value of the X and Y components without considering the directionality of the vector.
- the bar graph 630 shown in FIG. 22 is an example in which the scalar map of the two evaluation data shown in FIG. 21 is displayed as a three-dimensional bar graph.
- the same display target data can be output in any form as described above.
- arbitrary data can be displayed and output in a desired form, and data analysis and evaluation can be performed efficiently and appropriately.
- the residual component after the alignment correction at each mark measurement position in (a) is used for analyzing the tendency of the breakdown of the average and the variation.
- EGA log data is used as evaluation data, and the display unit is specified for each single wafer.
- the display unit is specified for each single wafer.
- the data selected for evaluation is related to multiple wafers
- the data is recognized separately for each wafer, and by specifying the wafer number, the wafer information corresponding to the number is displayed for each single wafer. Is displayed.
- the designation of the wafer number is performed by inputting in the “Wafer NO” column in the middle right side of the screen 510 in FIG. 10 or by operating the scroll bar in the “Wafer NO” column.
- the check box of is checked, the data for all wafers to be evaluated are displayed simultaneously on one map.
- data discrimination between wafers can be performed by the color, thickness, shape, etc. of the vector display.
- a numerical display of the calculation results of the second-order EGA calculation model and the third-order EGA calculation model as shown in FIG. 17 is preferable.
- the numerical display is executed by double-clicking the desired shot on the screen 510 in FIG. 10 or selecting the desired shot with a single tariff and pressing the “Shot Data” button at the lower right of the screen.
- the wafer average of residual components after alignment correction 3 ⁇ , maximum value (MAX), minimum value (MIN), width (Range), and distribution type (distortion and kurtosis) are numerical values. Is displayed. As described above, the left and right slide bars are used for the maximum value (MAX), minimum value (MIN), width (Range), and distribution type (distortion and kurtosis) on the screen shown in FIG. You can see more than what you do.
- the calculation result of the secondary EGA calculation model and the calculation result of the tertiary EGA calculation model are displayed superimposed.
- the calculation results of the residual components in the two calculation models can be compared and evaluated for each mark position.
- a comparison is performed using a vector overlay map screen 540 of residual components after alignment correction as shown in FIG.
- the calculation result is displayed for the difference between the residual component when using the second-order EGA calculation model and the residual component when using the third-order EGA calculation model.
- the comparison is performed on the residual component vector difference map screen 550 after the alignment correction shown in FIG.
- the difference between the second-order EGA calculation model and the first-order EGA calculation model, Calculation model may be displayed in an overlapping manner. In other words, it is possible to compare the amount of correction for nonlinear components in the 3D EGA calculation model and the 2D EGA calculation model.
- the square root of the sum of squares of the X component and Y component of the difference is synthesized and combined as a scalar difference map, and the contour map of the scalar map as shown in Fig. 21 or the bar graph of the scalar map as shown in Fig. 22 May be displayed.
- the correlation between the residual component when using the second-order EGA calculation model and the residual component when using the third-order EGA calculation model is displayed.
- the low correlation value means that the second-order EGA calculation model is used and the third-order EGA calculation model is used. This means that the difference in residual components is large.
- a contour map of the scalar map as shown in FIG. 21 or a bar map of the scalar map as shown in FIG. 22 may be displayed.
- the mark data relating to the specified shot is displayed as shown in FIG.
- a waveform diagram 523 relating to the designated shot (mark) is compared with a waveform diagram 524 referred to as a reference.
- the determined conditions are reflected in the re-evaluation, EGA simulation, overlay simulation, and actual exposure processing by pressing the “Apply” button in the lower right.
- Mark detection parameters in EGA simulation algorithm slice level is 0% to 100%, contrast limit is 0% to 100%, mark detection tolerance is 0 / ⁇ ⁇ to 999.99 99 ⁇ m, etc. If you want to compare the simulation results with different values, it is useful to display the graph as shown in Fig. 20.
- the alignment measurement value (offset) is specified as the evaluation target, and the data display unit is specified for each single mark to change the algorithm slice level of the EGA simulation parameter. It is a graph at the time of letting. The same applies when the evaluation target is the contrast limit.
- the evaluation target may be specified as the residual component after the alignment correction, and the data display unit may be specified for every multiple wafers.
- the user when the purpose is “cause of waveform detection error”, the user does not select “display waveform data”, but automatically selects “cause of waveform detection error” by selecting the purpose of “waveform detection error”. It is conceivable that “display” is selected as the display form. Alternatively, it is conceivable that the “graph display” is automatically selected when the user selects “change in mark detection offset due to parameter change” as a purpose.
- the user can select an appropriate display form even if the user has no knowledge about each display form, and the user can intuitively use the appropriately selected display form. It becomes possible to grasp the situation.
- FIG. 23 is a flowchart showing a manufacturing process of an electronic device such as a semiconductor chip such as an IC or LSI, a liquid crystal panel, a CCD, a thin film magnetic head, or a micromachine.
- a semiconductor chip such as an IC or LSI
- a liquid crystal panel such as an IC or LSI
- a CCD complementary metal-oxide-semiconductor
- a thin film magnetic head such as a micromachine.
- process S820 manufacture a mask with the designed circuit pattern.
- a wafer (silicon substrate) is manufactured using a material such as silicon (step S830).
- step S840 using the mask manufactured in step S820 and the wafer manufactured in step S830, an actual circuit or the like is formed on the wafer by lithography technology or the like (step S840). Specifically, a thin film with an insulating film, an electrode wiring film or a semiconductor film is first formed on the wafer surface (step S841), and then a resist coating apparatus (coater) is used on the entire surface of the thin film. A photosensitive agent (resist) is applied (step S842).
- a photosensitive agent resist
- the resist-coated substrate is loaded onto the wafer holder of the above-described exposure apparatus according to the present invention, and the mask manufactured in step S830 is loaded onto the reticle stage to form the mask.
- the transferred pattern is reduced and transferred onto the wafer (step S843).
- the exposure apparatus sequentially aligns each shot area of the wafer by the above-described alignment method according to the present invention, and sequentially transfers the mask pattern to each shot area.
- the wafer is unloaded from the wafer holder and developed using a developing device (developer) (step S844). As a result, a resist image of the mask pattern is formed on the wafer surface.
- step S845 the wafer subjected to the development process is etched using an etching apparatus (step S845), and the resist remaining on the wafer surface is removed using, for example, a plasma ashing apparatus (step S846).
- step S850 the device is then assembled (step S850). Specifically, the wafer is diced and divided into individual chips, each chip is mounted on a lead frame or package, bonding is performed to connect electrodes, and packaging processing such as resin sealing is performed.
- the manufactured device is subjected to inspections such as an operation confirmation test and a durability test (step S860), and shipped as a device completed product.
- inspections such as an operation confirmation test and a durability test (step S860)
- the overall configuration of the exposure system is not limited to the configuration shown in FIG.
- an information server 160 that stores various information such as EGA measurement result data and overlay measurement results in a centralized manner is provided separately may be used.
- another computer may be connected to the intranet to distribute the processing.
- it may be a system constructed through another communication network, or a system constructed as a V or so-called server client type system.
- the form of sharing of processing such as calculation and control operations in each apparatus of the exposure system, in other words, the distributed form of functions as a distributed processing system, or the connection form of these apparatuses as a network system is arbitrary. It may be a form.
- the force described in the case of using an off-axis type FIA system (imaging type alignment sensor) as the alignment system is not limited to this, and the mark detection of any system is possible.
- a system may be used.
- a method for detecting diffracted light or scattered light may be used.
- the alignment mark on the wafer is irradiated almost perpendicularly with a coherent beam, and the same-order diffracted light ( ⁇ 1st order, ⁇ 2nd order, ⁇ nth order diffracted light) generated from the mark is interfered and detected.
- An alignment system is also acceptable.
- the diffracted light may be detected independently for each order, and the detection result of at least one order may be used, and the alignment mark may be irradiated with a plurality of coherent beams having different wavelengths and each wavelength may be irradiated. It can be detected by interfering with the diffracted light of the order.
- the present invention is not limited to the step 'and' scan type exposure apparatus as in each of the above embodiments, but the step 'and' repeat type or proximity type exposure apparatus (such as an X-ray exposure apparatus).
- the same can be applied to various types of exposure apparatuses such as (1).
- the exposure illumination light (energy beam) used in the exposure apparatus is not limited to ultraviolet light, but may be X-rays (including EUV light), charged particle beams such as electron beams and ion beams, and the like.
- the present invention may be an exposure apparatus used for manufacturing a DNA chip, a mask, a reticle, or the like.
- the present invention may include all device-related apparatuses having alignment, such as various measurement / inspection apparatuses for wafer reticles,
- the laser repair device can be applied to a device exclusively for observation.
Abstract
Description
Claims
Priority Applications (4)
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JP2006531882A JP4715749B2 (ja) | 2004-08-19 | 2005-08-19 | アライメント情報表示方法とそのプログラム、アライメント方法、露光方法、デバイス製造方法、表示システム、表示装置 |
EP05772567.3A EP1796136B1 (en) | 2004-08-19 | 2005-08-19 | Alignment information display method, program thereof, alignment method, exposure method, device manufacturing method, display system, display device, program, and measurement/inspection device |
US11/660,385 US8982320B2 (en) | 2004-08-19 | 2005-08-19 | Alignment information display method and its program, alignment method, exposure method, device production process, display system, display device, and program and measurement/inspection system |
KR1020077003907A KR101191057B1 (ko) | 2004-08-19 | 2005-08-19 | 얼라인먼트 정보 표시 방법과 그 프로그램, 얼라인먼트방법, 노광 방법, 디바이스 제조 방법, 표시 시스템, 표시장치, 프로그램 및 측정/검사 장치 |
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JP2004-240058 | 2004-08-19 | ||
JP2004240058 | 2004-08-19 |
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US (1) | US8982320B2 (ja) |
EP (1) | EP1796136B1 (ja) |
JP (1) | JP4715749B2 (ja) |
KR (1) | KR101191057B1 (ja) |
CN (1) | CN100479097C (ja) |
TW (1) | TWI451475B (ja) |
WO (1) | WO2006019166A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
CN101006555A (zh) | 2007-07-25 |
EP1796136A4 (en) | 2010-01-27 |
CN100479097C (zh) | 2009-04-15 |
KR20070041580A (ko) | 2007-04-18 |
KR101191057B1 (ko) | 2012-10-15 |
US20080106714A1 (en) | 2008-05-08 |
JPWO2006019166A1 (ja) | 2008-05-08 |
TWI451475B (zh) | 2014-09-01 |
US8982320B2 (en) | 2015-03-17 |
EP1796136A1 (en) | 2007-06-13 |
JP4715749B2 (ja) | 2011-07-06 |
TW200623232A (en) | 2006-07-01 |
EP1796136B1 (en) | 2015-09-30 |
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