WO2006046427A1 - 重ね合わせ検査システム - Google Patents
重ね合わせ検査システム Download PDFInfo
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- WO2006046427A1 WO2006046427A1 PCT/JP2005/019048 JP2005019048W WO2006046427A1 WO 2006046427 A1 WO2006046427 A1 WO 2006046427A1 JP 2005019048 W JP2005019048 W JP 2005019048W WO 2006046427 A1 WO2006046427 A1 WO 2006046427A1
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- Prior art keywords
- overlay
- inspection
- substrate
- overlay inspection
- inspection apparatus
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70483—Information management; Active and passive control; Testing; Wafer monitoring, e.g. pattern monitoring
- G03F7/70491—Information management, e.g. software; Active and passive control, e.g. details of controlling exposure processes or exposure tool monitoring processes
- G03F7/70525—Controlling normal operating mode, e.g. matching different apparatus, remote control or prediction of failure
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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
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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
- G03F9/7088—Alignment mark detection, e.g. TTR, TTL, off-axis detection, array detector, video detection
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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
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67253—Process monitoring, e.g. flow or thickness monitoring
Definitions
- the present invention relates to an overlay inspection system that performs overlay inspection of a plurality of patterns formed on different layers of a substrate, and is particularly suitable for overlay inspection in a manufacturing process of semiconductor elements, liquid crystal display elements, and the like.
- the present invention relates to an overlay inspection system.
- a circuit pattern is transferred to a resist layer through a known lithographic process, and a predetermined material is obtained by performing processing such as etching through the resist pattern.
- the circuit pattern is transferred to the film (pattern formation process). Then, by repeating this pattern formation process many times, circuit patterns of various material films are stacked on a substrate (semiconductor wafer or liquid crystal substrate), and a circuit of a semiconductor element or a liquid crystal display element is formed. .
- each pattern forming process is performed after the process of the sodolafier.
- the positional deviation of the resist pattern on the substrate is detected (for example, see Patent Document 1).
- the result of overlay inspection is used for determining the quality of the substrate.
- overlay inspection is performed by a single-type apparatus having independent lithography system (including exposure apparatus) power.
- the substrate to be inspected passes through the lithographic process and is then transported to the overlay inspection device while being stored in a transport container such as a cassette (that is, in units of lots).
- the overlay inspection apparatus performs overlay inspection by sampling a part of the substrates in the lot, and outputs the result of overlay inspection for each lot.
- the quality of the substrate is judged on a lot basis, and if it is a non-defective product, it is transported on a lot basis to the next process (machining process, etc.), and if it is a defective product, it is transported to the recycling or disposal process.
- the result of overlay inspection in a lot A is used to judge the quality of that lot A, and to improve the yield rate of the next lot B (the same product name and the same process name as lot A). This is fed back to the exposure process in the lithographic process and used to correct the exposure process for the next lot B.
- Correction of the exposure process means that when the latent image of the circuit pattern formed on the mask (reticle) is printed on the resist layer, the position and size of the latent image and the underlying pattern are shifted (hereinafter referred to as “process offset” t).
- process offset t
- This is a process of finely adjusting each part of the exposure apparatus (alignment system, AF system, etc.) in advance so as to reduce ().
- the process offset of the exposure process varies little by little with the passage of time in each part of the exposure apparatus, and also varies depending on the state of the underlying layer of each substrate. For this reason, it is necessary to correct the exposure process in order to avoid an increase in process offset.
- a latent image having a small process offset is printed on the resist layer in the exposure process for the next lot B. Then, after the development process, a resist pattern corresponding to the latent image is formed on the base pattern, and the resist pattern in the next lot B is also superposed. The result of overlay inspection in lot B is fed back to the exposure process and used to correct the exposure process for the next lot C, as described above.
- an inspection result output in units of lots from a single-type overlay inspection apparatus is fed back to the exposure process, and exposure to the next lot is performed based on the result of overlay inspection of a certain lot. While correcting the process, the exposure process is repeated for each lot. Therefore, in the lithographic process for multiple lots with the same product name and the same process name, the process offset of the exposure process can be reduced each time the lot is switched, and an increase in process offset can be avoided.
- Patent Document 1 Japanese Patent Laid-Open No. 11 31229
- the exposure process is corrected in units of lots as described above. And not corrected for each substrate in the lot.
- circuit patterns are further miniaturized due to higher integration of semiconductor elements and the like, higher overlay accuracy will be required, so fine correction of the exposure process will be necessary, for example, for each substrate. .
- An object of the present invention is to perform overlay inspection of each substrate in the mouth without reducing the original throughput of the lithography system, and to provide high accuracy that can be used for correcting the exposure process.
- the substrate taken out from the transport container is incorporated into a path until it is collected in the transport container through at least an exposure process and a development process, and the development process is performed.
- a first inspection apparatus that performs a registration inspection of the resist pattern and the base pattern on the substrate in accordance with a predetermined condition and outputs a result of the overlay inspection for correction of the exposure process; and the path
- a second inspection device that performs overlay inspection of the resist pattern and the base pattern on the substrate, and results of overlay inspection by the first inspection device and overlay inspection by the second inspection device. The results are compared and the conditions for overlay inspection by the first inspection device are compensated.
- a condition correcting means for correcting is performed.
- the first inspection device includes a storage unit that stores in advance an error component derived from the first inspection device, and the substrate is directed in a predetermined direction.
- a first capture unit that captures an image of the measurement point of the substrate; a first calculation unit that calculates an overlay displacement amount at the measurement point based on the image; and the overlay displacement amount is stored in the storage unit.
- a first correction unit configured to correct the error component, wherein the second inspection apparatus captures the first image of the measurement point of the substrate in a state where the substrate is directed in a predetermined direction, and the substrate Is rotated 180 degrees from a predetermined direction, and is based on both the second capture unit that captures the second image of the measurement point and the first image and the second image.
- a second calculation unit for calculating an error component, and the first image or the above A third calculation unit that calculates an overlay deviation amount at the measurement point based on two images; a second correction unit that corrects the overlay deviation amount by the error component calculated by the second calculation unit; And the condition correction means compares the result of the overlay inspection by the first inspection device with the result of the overlay inspection by the second inspection device, and includes the condition of the overlay inspection by the first inspection device.
- the error component stored in the storage unit is corrected.
- the first inspection device and the second inspection device perform overlay inspection at one or more same measurement points on the substrate, respectively, and the condition correction unit
- the overlay deviation amount corrected by the first correction unit is the first
- the overlay deviation amount corrected by the second correction unit as a result of the overlay inspection by the second inspection device, and the two corrected at the same measurement point
- a difference between the overlay deviation amounts is obtained, and the error component stored in the storage unit is corrected based on the difference.
- the first inspection apparatus is incorporated in a coating / image forming apparatus that applies a resist before the exposure process and develops the resist after the exposure process.
- the second inspection device is disposed outside the coating / developing device.
- the overlay inspection system of the present invention it is possible to perform overlay inspection of each substrate in a lot without reducing the original throughput of the lithography system, and it can be used for correcting the exposure process. High accuracy can be maintained.
- FIG. 1 is a block diagram showing a configuration of an overlay inspection system 10 of the present embodiment.
- FIG. 2 is a diagram for explaining a measurement point 10B of a substrate 10A.
- FIG. 3 is a diagram showing a schematic configuration of a built-in overlay inspection apparatus 11 and a single overlay inspection apparatus 12.
- FIG. 4 is a diagram for explaining a modification of the measurement point 10 B in the single-type overlay inspection apparatus 12.
- the overlay inspection system 10 of the present embodiment includes an overlay inspection apparatus 11 incorporated in the lithography system 20, a single-type overlay inspection apparatus 12 independent from the lithography system 20, and a database. It is composed of 13.
- This overlay inspection system 10 performs overlay inspection of a plurality of patterns formed on different layers of a substrate 10A (semiconductor wafer, liquid crystal substrate, etc.) in the manufacturing process of semiconductor elements, liquid crystal display elements, and the like.
- the substrate 10A is transported to the lithography system 20 in a state of being accommodated in a transport container 14 such as a cassette (that is, in units of lots), passes through a lithographic process (described later), and then transported again. In the state of being stored in 14, it is conveyed to a single-type overlay inspection device 12. Such movement of the transfer container 14 is performed by an automatic transfer device (not shown) or an operator.
- the transport container 14 can store a plurality of (for example, 25) substrates 10A, and is sometimes called a carrier.
- the lithography system 20 Before specifically describing the overlay inspection system 10 of the present embodiment, the lithography system 20 will be described.
- an exposure apparatus 21 and a coater / developer 22 are installed adjacent to each other, and a transport mechanism (not shown) for the substrate 10A is installed therebetween.
- the coater / developer bar 22 is loaded with a loading / unloading section 31, a coater 32, and a developer bar 33, and further includes a built-in overlay inspection apparatus 11 of the overlay inspection system 10 of the present embodiment.
- a transport mechanism (not shown) for the substrate 10A is also installed.
- the apparatuses (11, 21, 31 to 33) are inlined with each other by a transport mechanism (not shown).
- the loading / unloading unit 31 is a device for loading and unloading the transfer container 14 in which the substrate 10A is stored.
- the coater 32 is an apparatus for applying a resist to each substrate 10A in the transport container 14 (that is, in the lot) before the exposure process in the exposure apparatus 21.
- the developer bar 33 is an apparatus for developing the resist on each substrate 10A after the exposure process.
- the built-in overlay inspection apparatus 11 is an apparatus that performs overlay inspection (details will be described later) of each substrate 10A after the development process.
- the exposure device 21 is a device that prints the latent image of the circuit pattern formed on the mask (reticle) on the resist layer of each substrate 10A.
- each substrate 10 A taken out from the transport container 14 is exposed through a resist coating process in the coater 32.
- the process is transported to the built-in overlay inspection apparatus 11, and after the inspection process in the overlay inspection apparatus 11, the transport container Collected in 14.
- the built-in overlay inspection apparatus 11 is incorporated in the lithography system 20 in order to correct the exposure process on a single wafer.
- the substrate is removed from 14 transport containers, and after it has been recovered through the 10A scale process (resist coating process, exposure process, development process, etc.) to the transport container 14
- overlay inspection of the substrate 10A can be performed, and the result can be feed-knocked into the exposure process.
- Exposure process correction means that when a latent image of a circuit pattern is printed on a resist layer, each part (alignment) of the exposure apparatus 21 is reduced so that a process offset between the latent image and the underlying pattern is reduced. This is a process for fine-tuning the lens system and AF system) in advance.
- the process offset of the exposure process varies little by little with the passage of time of each part of the exposure apparatus 21, and also varies depending on the state of the underlying layer of each substrate 10A. Incidentally, the state of the underlying layer of the substrate 10A is often different for each substrate 10A due to the influence of changes over time of the film forming device and the CMP device. For this reason, when the circuit pattern is further miniaturized along with the high integration of semiconductor elements or the like, it is necessary to correct the exposure process on a single wafer.
- a machine controller 23 is connected above the exposure apparatus 21 and the coater / developer bar 22.
- the machine controller 23 controls the exposure apparatus 21 and the coater / developer bar 22 based on instructions from the factory host 24, and the processing contents of each apparatus (11, 21, 31 to 33) and the loading / unloading of the substrate 10A. And instructing the correction of the exposure process and exposure process.
- the factory host 24 performs process management of the entire factory (including the lithography system 20 and the overlay inspection system 10 of this embodiment)!
- the built-in overlay inspection apparatus 11 is placed in the coater / developer bar 22 until the substrate 10A taken out from the transport container 14 is collected in the transport container 14 through the lithographic process. Is built into the path. Further, the single type overlay inspection device 12 is arranged outside the coater / developer bar 22 (that is, outside the above path). Further, the built-in overlay inspection apparatus 11 is connected to the database 13 via a communication means (not shown), and the single overlay inspection apparatus 12 is also connected to the database 13 via a communication means (not shown). As a whole, a network is formed.
- the substrate 10A to be inspected by the built-in type overlay inspection apparatus 11 and the substrate 10A to be inspected by the single-type overlay inspection apparatus 12 are in the same state after development, and on the surface thereof A resist pattern is formed. Then, the overlay inspection force between the resist pattern and the base pattern on the substrate 10A is performed inside and outside the lithography system 20 by the built-in overlay inspection apparatus 11 and the single overlay inspection apparatus 12.
- the positions of the measurement points are the four corners of each shot area of the substrate 10A.
- Each measurement point has a cash register A resist mark indicating the reference position of the strike pattern and a base mark indicating the reference position of the base pattern are formed.
- the overlay inspection system 10 of this embodiment among the many measurement points of the substrate 10A, the relative displacement amounts (overlapping) between the registration mark and the base mark are respectively measured at 20 measurement points 10B shown in FIG. The amount of misalignment) is determined, and overlay inspection is performed.
- the built-in overlay inspection device 11 and the stand-alone overlay inspection device 12 have the same number of measurement points on the substrate 10A, and the same measurement points on one or more (for example, 20 locations) on the substrate 10A. Perform overlay inspection at 10B.
- the built-in overlay inspection apparatus 11 and the stand-alone overlay inspection apparatus 12 are each provided with an inspection stage 41, an optical system 42, a camera 43, and an image processing unit 44 shown in FIG. It is done.
- the inspection stage 41 supports the substrate 10A.
- the optical system 42 forms an optical image of a local region (measurement point 10B) of the substrate 10A.
- the camera 43 captures an optical image of the substrate 10A with an image sensor (not shown) and outputs an image signal to the image processing unit 44.
- the image processing unit 44 captures an imaging signal from the camera 43, it converts it into a digital image, performs predetermined signal processing on the image, and calculates an overlay deviation amount at the measurement point 10B.
- the basic configuration of the built-in overlay inspection apparatus 11 and the single overlay inspection apparatus 12 are the same.
- the drive unit and vibration isolation table of the inspection stage 41 are compared to the stand-alone overlay inspection apparatus 12 because of the limitation of the space that can be incorporated in the lithography system 20. Etc. are downsized. For this reason, the processing capability of the built-in overlay inspection apparatus 11 is lower than that of the single overlay inspection apparatus 12.
- the built-in overlay inspection apparatus 11 in order to shorten the time required at each measurement point 10B of the substrate 10A, the measurement item at each measurement point 10B is changed to a single overlay inspection apparatus. Less than 12.
- the built-in overlay inspection device 11 measures each measurement point 1OB only when the substrate 10A is directed in the positive direction (0 degree direction), whereas the single overlay inspection In the apparatus 12, each measurement point 10B is measured both in a state where the substrate 10A is directed in the positive direction (0 degree direction) and in the opposite direction (180 degree direction).
- the measurement in the opposite direction which is omitted in the built-in overlay inspection apparatus 11, is a measurement related to the setting of an error component (TIS value: Tool Induced Shift) caused by the apparatus.
- TIS value Tool Induced Shift
- the database 13 connected to the built-in overlay inspection apparatus 11 and the single overlay inspection apparatus 12 configured as described above includes a recipe for the built-in overlay inspection apparatus 11. And a recipe for the single-type overlay inspection apparatus 12 are stored in advance.
- Each recipe is a file in which the position information of each measurement point 10B (Fig. 2) of the substrate 10A and the measurement items at each measurement point 10B are registered.
- the position information of each measurement point 10B is the same in the recipe for the built-in overlay inspection apparatus 11 and the recipe for the single overlay inspection apparatus 12.
- the number of measurement items at each measurement point 10B is smaller in the built-in overlay inspection apparatus 11 than in the single overlay inspection apparatus 12.
- the TIS value (T 1) of the overlay inspection apparatus 11 is registered in addition to the position information and the measurement items.
- the subscript i indicates the number of each shot area of the substrate 10A
- the subscript j indicates the number of each measurement point 10B in the shot area. That is, in this embodiment, a TIS value (T1) can be registered for each measurement point 10B of the substrate 10A. Such registration of TIS values should be done in the recipe for the stand-alone overlay inspection device 12.
- a recipe for the built-in overlay inspection apparatus 11 position information of each measurement point 10B, measurement items at each measurement point 10B, TIS value (T1;) for each measurement point 10B
- the recipe for the single-type overlay inspection device 12 position information of each measurement point 10B, measurement item at each measurement point 10B
- the overlay inspection result is also stored in the database 13 in association with the product name, process name, and lot number.
- the factory host 24 refers to the product name and process name of the transport container 14 that has been set, and sets the resist coating conditions, exposure conditions, development conditions, inspection conditions, etc. suitable for the substrate 10A in the transport container 14. Instruct controller 2 3. At this time, the product name, process name, and lot number are output to the machine controller 23 along with various conditions.
- the machine controller 23 issues instructions to the exposure apparatus 21 and the coater / developer 22 on the basis of instructions from the factory host 24, and also issues instructions to a transport mechanism (not shown).
- the substrate 10A is taken out from the transfer container 14 of the loading / unloading unit 31, the resist is applied to the substrate 10A by the coater 32, and the circuit pattern is formed on the resist layer by the exposure device 21.
- the latent image is formed, the resist layer is developed by the developer 33, the overlay inspection (details will be described below) is performed by the built-in overlay inspection device 11, and collected in the transport container 14.
- a recipe for the overlay inspection apparatus 11 (each measuring point 10B) associated with the product name and process name of the current lot based on an instruction from the factory host 24. Position information, measurement items at each measurement point 10B, and TIS value (T1)) at each measurement point 10B are read from the database 13. Then, when the substrate 10A after the development process is placed on the inspection stage 41, each measurement point 10B (FIG. 2) is sequentially positioned within the field of view of the apparatus according to the position information registered in the recipe. In addition, for each measurement point 10B, overlap inspection is performed according to the measurement items registered in the recipe. Furthermore, the built-in overlay inspection apparatus 11 sets the TIS value (T1) registered in the recipe as a condition for overlay inspection, and performs overlay inspection according to this condition.
- the built-in overlay inspection apparatus 11 captures an image of the measurement point 10B with the substrate 10A facing in the positive direction (0 degree direction) (first capture unit), and By applying predetermined signal processing, the overlay deviation amount at the measurement point 10B is calculated (first calculation unit). O The overlay deviation amount at each measurement point 10B calculated at this time is defined as SI.
- the subscript n represents the number of the substrate 10A
- the subscript i represents the number of each shot area of the substrate 10A
- the subscript j represents the number of each measurement point 10B in the shot area.
- the built-in overlay inspection apparatus 11 calculates the overlay displacement amount (S1) at each measurement point 1OB according to the following equation (1) as the TIS value (T1 )
- the overlay displacement amount (R1) after correction by the TIS value (T1) is the result of overlay inspection by the built-in overlay inspection apparatus 11.
- the built-in overlay inspection device 11 exposes the corrected overlay deviation (R1). Output to machine controller 23 for process correction.
- Rl S1 -T1 ...
- the corrected overlay deviation amount (Rl) is the built-in overlay inspection device 11
- the product name, process name, and lot number are also stored and used as an index for referencing the results.
- the substrate 10A after the development process is placed in order, and all (for example, 25) substrates 10A in the transport container 14 are mounted.
- the same overlay inspection as described above is repeatedly performed (total inspection).
- a common TIS value (T1) is used for the substrate 10A in one transfer container.
- the overlay deviation amount (R1) of each substrate 10A output from the built-in overlay inspection device 11 to the machine controller 23 is within the lot in order to improve the yield rate of the current lot.
- Each substrate 10A is fed back to the exposure process as a single wafer and used for correcting the exposure process for the next substrate 10A (the substrate 10A to be transported to the exposure apparatus 21 from now on).
- the machine controller 23 generates correction data (offset component, scaling component, rotation component, etc.) of the exposure apparatus 21 based on the overlay deviation amount (R1) of each substrate 10A, and processes the exposure process. Correct the exposure process to reduce the offset.
- the lithographic process resist coating process, exposure process, development process, etc.
- the exposure apparatus 21 and the coater / developer bar 22 notify the factory host 24 via the machine controller 23.
- the transport container 14 is unloaded from the loading / unloading section 31 from the factory host 24 to an external automatic transport device (not shown) or operator. Is instructed.
- the factory host 24 is notified of this.
- the factory host 24 refers to the product name and process name of the transport container 14 that has been set, and instructs the inspection conditions suitable for the substrate 10A in the transport container 14. At this time, the product name, process name, and lot number of the lot are output from the factory host 24 to the single overlay inspection apparatus 12.
- the recipe for the overlay inspection apparatus 12 associated with the product name and process name of the current lot (for each measurement point 10B) Read the position information and measurement items at each measurement point 10B). Then, when the substrate 10A newly taken out from the transport container 14 is placed on the inspection stage 41, each measurement point 10B (FIG. 2) is sequentially positioned within the field of view of the apparatus according to the position information registered in the recipe. . At each measurement point 10B, overlay inspection is performed according to the measurement items registered in the recipe.
- the single-type overlay inspection apparatus 12 captures the first image of the measurement point 10B while the substrate 10A is directed in the positive direction (0 degree direction), and the substrate 10A is moved from the positive direction.
- the second image of the measurement point 10B is captured in the state rotated by 0 degrees (that is, the direction facing the opposite direction (180-degree direction)) (second capture unit).
- the overlay deviation amount at the measurement point 10B is calculated (third calculation unit).
- the same signal processing is applied to the second image.
- the amount of misalignment at the measurement point 10B is calculated.
- the overlay displacement amount in the positive direction calculated from the first image is S2
- the overlay displacement amount in the opposite direction calculated from the second image force is H2.
- Subscript n represents the number of the substrate 10A
- subscript i represents the number of each shot area
- subscript j represents the number of each measurement point 10B in the shot area.
- the single-type overlay inspection apparatus 12 has the following equation (2) to calculate the difference between the overlay deviation amount (S2) in the positive direction and the overlay deviation amount (H2) in the opposite direction. Based on both, the TIS value (T2) of the overlay inspection apparatus 12 is calculated for each measurement point 10B (second calculation unit).
- the subscript i represents the number of each shot area of the substrate 10A, and the subscript j represents the number of each measurement point 10B in the shot area.
- T2 (S2 + H2) / 2---(2)
- the single-type overlay inspection apparatus 12 sets the TIS value (T2), which is the above calculation result, as the overlay inspection condition, and continues the overlay inspection according to this condition.
- T2 the amount of overlay deviation (S2) in the positive direction at each measurement point 10B is corrected for each measurement point 10B by the TIS value (T2) (second correction). Part).
- the single-type overlay inspection apparatus 12 outputs the corrected overlay deviation amount (R2) to the database 13, and associates it with the number n of the substrate 10A, the number i of the shot area, and the number j of the measurement point 10B. save. Also in this case, the product name, process name, and lot number are stored together with the corrected overlay deviation amount (R2) and used as an index when referring to the result.
- the single overlay inspection apparatus 12 notifies the factory host 24 to that effect. Thereafter, the factory host 24 unloads the transfer container 14 to an automatic transfer device (not shown) or an operator. Give instructions to do so.
- the single-type overlay inspection apparatus 12 in the case of a non-defective product, it is transported in lot units to the next process (processing process, etc.), and in the case of a defective product, it is transferred to the recycling process or the disposal process.
- the single-type overlay inspection apparatus 12 refers to the inspection result stored in the database 13 after the sampling inspection as described above, and is used for the built-in overlay inspection apparatus 11
- the TIS value (T1) in the database 13 registered in the recipe is corrected. This correction process will be described next.
- the inspection result to be referred to is that the product name, process name, and lot number are the same among the inspection result by the built-in overlay inspection device 11 and the inspection result by the single overlay inspection device 12, and the number of the substrate 10A. n is the same.
- the corrected TIS value (T1) is registered in the recipe with the same product name and process name as the inspection result referred to.
- the built-in overlay inspection device 11 With reference to the inspection result (R2) by the inspection device 12, the built-in overlay inspection device 11
- the TIS value (T1) in the database 13 registered in the recipe for correction is corrected.
- the single registration inspection apparatus 12 refers to the above two types of inspection results, and compares the overlay deviation amount (R1) and the overlay deviation amount (R2) at the same measurement point 10B.
- the overlay deviation amount (R1) and the overlay deviation amount (R2) are compared between the same in the shot area number i of the substrate 10A and the number j of the measurement point 10B. As above, pair
- the overlay displacement amount (Rl) due to the embedded mold depends on the TIS value (T1) registered in advance in the recipe.
- the amount of misalignment (R2) due to the stand-alone type is the actual measured TI
- the two types of test results should have the same value even if the equipment used is different. In practice, however, the two types of test results may differ slightly. This is because the built-in overlay inspection apparatus 11 calculates the overlay displacement amount (R1) using the TIS value (T1) in the data base 13 previously registered in the recipe. Pair
- the actual TIS value of the built-in overlay inspection device 11 is the value of each part of the device (such as optical system 42). It changes according to the change over time and the cross-sectional shape of the mark at each measurement point 10B on the substrate 10A, and the TIS value registered in the recipe in advance (if it does not match Ti, there will be a gap between the two types of inspection results. Become.
- the built-in that can change in accordance with the aging of each part of the apparatus (such as the optical system 42) and the cross-sectional shape of the mark at each measurement point 10B on the substrate 10A.
- the TIS value (Tl) of the recipe for the built-in overlay inspection device 11 is corrected so as to match. For this reason, the change over time of the actual TIS value in the built-in overlay inspection device 11 can be reflected in the next lot with the same product name and the same process name, and the TIS value (T1) of the recipe and the actual Deviation from the TIS value can be kept within a stable range. As a result, the inspection conditions in the built-in overlay inspection device 11 are stable, and the inspection accuracy decreases. Can be avoided.
- TIS value (T1) of the recipe is corrected in units of lots, it is possible to use it for correction of the exposure process without the occurrence of a problem of changes in inspection accuracy over time in the built-in overlay inspection device 11. Can be kept high.
- the built-in overlay inspection apparatus 11 uses the processing capability to the maximum, and has high accuracy that can be used for correction of the exposure process without reducing the original throughput of the lithography system 20.
- the overlay inspection of each substrate 10A in the lot can be continued. Therefore, in the lithography system 20, the result of the overlay inspection of each substrate 10A can be quickly fed back to the exposure apparatus 21 in a single sheet, and the manufacture of devices such as semiconductor elements can be performed more stably.
- the built-in overlay inspection apparatus 11 and the single overlay inspection apparatus 12 are overlapped at one or more of the same measurement points 10B on each substrate 10A.
- a TIS value (T1) is calculated based on the difference ⁇ between the built-in overlay (R1) and the stand-alone overlay (R2) at the same measurement point 10B.
- the correction process can be easily performed.
- FIG. 2 an example (FIG. 2) in which the measurement point 10B of each substrate 10A is the same in the built-in overlay inspection apparatus 11 and the single overlay inspection apparatus 12 is described.
- the invention is not limited to this.
- the present invention can also be applied to a case where more measurement points 10B in a single type are set than in the built-in type so that all measurement points 10B in the built-in type are included.
- the measurement point 10B in the built-in type is the point marked with ⁇ shown in Fig. 2
- the part enclosed by the circular dotted frame is the newly added measurement point 10B.
- the powerful overlay described in the example in which the single overlay inspection apparatus 12 selectively takes out one substrate 10A from the transport container 14 and performs overlay inspection is not limited to this.
- the present invention can also be applied to the case where the number of sheets measured by the single-type overlay inspection apparatus 12 is two or more.
- TIS value (T1) of the recipe for the built-in overlay inspection device 11 when correcting the TIS value (T1) of the recipe for the built-in overlay inspection device 11, the difference between the two types of inspection results (R1 and R2) between the same measurement points 10B on the same substrate 10A. ( ⁇ ) is calculated and the difference ( ⁇ ) is calculated.
- nij nij nij nij nij nij is performed for each of two or more substrates 10A, and the obtained difference ( ⁇ ) is averaged between measurement points 10B of the same number ij on different substrates 10A, and the result is the difference ⁇ (formula (See (5)).
- the present invention is not limited to this. No. Different TIS values (T1) may be prepared for each substrate 10A. In this case, the single type
- the overlay inspection apparatus 12 also requires 100% inspection similar to the built-in overlay inspection apparatus 11. However, the present invention can also be applied to the case where the built-in overlay inspection apparatus 11 performs a sampling inspection (for example, the overlay inspection of every other substrate 10A). The overlay inspection of the substrate 10A that has been inspected by the overlay inspection apparatus 11 may be performed by the single overlay inspection apparatus 12.
- TIS value (T1) of the recipe for the built-in overlay inspection apparatus 11 is different for each measurement point 10B
- the present invention is not limited to this. Absent.
- a common TIS value (T1) may be prepared for each measurement point 10B of the substrate 10A.
- the difference ( ⁇ ) between two types of inspection results (R1 and R2) is calculated for each same measurement point 10B on the substrate 10A.
- the TIS value (T1) of the recipe for the built-in overlay inspection apparatus 11 when the TIS value (T1) of the recipe for the built-in overlay inspection apparatus 11 is corrected, two types of inspection results of the same lot number are compared.
- the present invention is not limited to this. Multiple past units in stand-alone overlay inspection system 12
- the test result force of the robot may be averaged at each measurement point 10B and compared with the built-in test result. It is also possible to estimate the variation between the previous lot test results and obtain the estimated value of the next lot test result and compare it with the built-in test results. By using the average value or estimated value, the effect of fluctuation singularity data can be reduced, and the TIS value can be corrected more stably.
- the present invention is not limited to this.
- the built-in overlay inspection device 11 and the stand-alone overlay inspection device 12 generate correction data (offset component, scaling component, rotation component, etc.) for the exposure device 21 and compare them.
- the TIS value may be corrected by
- the machine controller 23 corrects the exposure apparatus 21 based on the overlay deviation amount (R 1) output from the built-in overlay inspection apparatus 11.
- the built-in overlay inspection device 11 generates correction data for the exposure device 21 based on the overlay misalignment amount (R1),
- the present invention can also be applied to the case where the result of overlay inspection is output to the thin controller 23.
- the TIS value registered in the recipe for the built-in overlay inspection apparatus 11 is corrected by comparison with the inspection result by the single overlay inspection apparatus 12.
- the invention is not limited to this.
- the present invention can be applied not only to the TIS value but also to correcting a focus offset or the like by comparison with the inspection result of the single registration inspection apparatus 12. In this case, these TIS values and focus offsets generally correspond to the “overlay inspection conditions”.
- the power described in the example in which the single-type overlay inspection apparatus 12 compares the two types of inspection results in the database 13 and corrects the TIS value is limited to this. Don't be ashamed.
- the present invention can also be applied to the case where another arithmetic device connected to the database 13 compares two types of inspection results in the database 13 and corrects the TIS value.
- the database 13 is overlapped with the lithography system 20 and installed outside the inspection system 10. The present invention is not limited to this.
- a configuration that can read and write data from regular inspection equipment is also possible!
- Two inspection devices (11, 12) may communicate directly to compare the two types of inspection results.
- one built-in overlay inspection device 11 and one single overlay inspection device 12 are provided, but at least one of the two inspection devices (11, 12) is plural. It may be a stand.
Abstract
Description
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US11/661,398 US7873206B2 (en) | 2004-10-26 | 2005-10-17 | Registration detection system |
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JP2004310918A JP4449698B2 (ja) | 2004-10-26 | 2004-10-26 | 重ね合わせ検査システム |
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WO2017080727A1 (en) * | 2015-11-11 | 2017-05-18 | Asml Netherlands B.V. | Method and apparatus for predicting performance of a metrology system |
JP2018017643A (ja) * | 2016-07-29 | 2018-02-01 | 三菱電機株式会社 | 通電検査装置および通電検査方法 |
KR102625369B1 (ko) * | 2016-09-30 | 2024-01-15 | 가부시키가이샤 니콘 | 계측 시스템 및 기판 처리 시스템, 그리고 디바이스 제조 방법 |
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JPH11186358A (ja) * | 1997-12-22 | 1999-07-09 | Dainippon Screen Mfg Co Ltd | 基板処理装置及び基板処理システム |
WO2003077291A1 (fr) * | 2002-03-12 | 2003-09-18 | Olympus Corporation | Procede de fabrication de semi-conducteurs et dispositif d'usinage associe |
WO2005083756A1 (ja) * | 2004-03-01 | 2005-09-09 | Nikon Corporation | 事前計測処理方法、露光システム及び基板処理装置 |
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JPH1131299A (ja) | 1997-07-11 | 1999-02-02 | Mitsubishi Electric Corp | 車両用走行制御装置 |
US6392229B1 (en) * | 1999-01-12 | 2002-05-21 | Applied Materials, Inc. | AFM-based lithography metrology tool |
US20020158197A1 (en) * | 1999-01-12 | 2002-10-31 | Applied Materials, Inc | AFM-based lithography metrology tool |
JP2000294499A (ja) * | 1999-04-09 | 2000-10-20 | Mitsubishi Electric Corp | 重ね合わせ精度向上方法および重ね合わせずれ量測定装置 |
US20040227944A1 (en) * | 2003-02-28 | 2004-11-18 | Nikon Corporation | Mark position detection apparatus |
US7433039B1 (en) * | 2004-06-22 | 2008-10-07 | Kla-Tencor Technologies Corporation | Apparatus and methods for reducing tool-induced shift during overlay metrology |
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JPH11186358A (ja) * | 1997-12-22 | 1999-07-09 | Dainippon Screen Mfg Co Ltd | 基板処理装置及び基板処理システム |
WO2003077291A1 (fr) * | 2002-03-12 | 2003-09-18 | Olympus Corporation | Procede de fabrication de semi-conducteurs et dispositif d'usinage associe |
WO2005083756A1 (ja) * | 2004-03-01 | 2005-09-09 | Nikon Corporation | 事前計測処理方法、露光システム及び基板処理装置 |
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US20080107327A1 (en) | 2008-05-08 |
TW200620411A (en) | 2006-06-16 |
US7873206B2 (en) | 2011-01-18 |
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