WO2006046429A1 - 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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- WO2006046429A1 WO2006046429A1 PCT/JP2005/019058 JP2005019058W WO2006046429A1 WO 2006046429 A1 WO2006046429 A1 WO 2006046429A1 JP 2005019058 W JP2005019058 W JP 2005019058W WO 2006046429 A1 WO2006046429 A1 WO 2006046429A1
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- Prior art keywords
- overlay inspection
- overlay
- inspection
- substrate
- exposure
- Prior art date
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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
- G03F7/70605—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
- 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
-
- 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
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/162—Coating on a rotating support, e.g. using a whirler or a spinner
-
- 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
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/3021—Imagewise removal using liquid means from a wafer supported on a rotating chuck
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 more particularly to overlay inspection in a manufacturing process of semiconductor elements, liquid crystal display elements, and the like.
- the present invention relates to a suitable 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).
- pattern formation process 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).
- This is an overlay inspection of the circuit pattern of the underlying layer (hereinafter referred to as “underlying pattern”) formed in the previous pattern forming process and the resist pattern.
- the result of overlay inspection is used for determining the quality of the substrate.
- overlay inspection is performed by a single-type apparatus independent of a lithography system (including an exposure apparatus). For this reason, the substrate to be inspected passes through the lithographic process, and is then transferred to the inspection device in a state where it is stored in a transfer container such as a cassette (that is, in units of lots). Then, the overlay inspection device performs overlay inspection by sampling a part of the substrates in the lot, and outputs the result of the overlay inspection for each lot. After that, 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.
- Exposure process correction means that when a latent image of a circuit pattern formed on a mask (reticle) is baked onto a resist layer, the position and size of the latent image and the underlying pattern are shifted (hereinafter referred to as “process offset”).
- process offset is a process of finely adjusting each part of the exposure apparatus (alignment system, AF system, etc.) in advance so as to be small.
- 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 JP 2000-150353 A
- 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 provide a feasible overlay inspection system capable of finely correcting the exposure process with high accuracy.
- the overlay inspection system of the present invention is incorporated in a path from which the substrate taken out from the transport container is collected into the transport container through at least an exposure process and a development process, and after the development process, A first inspection device that performs overlapping inspection of a resist pattern and a base pattern on the substrate at a plurality of points of the substrate, and is disposed outside the path, and the resist pattern and the base pattern on the substrate Overlay inspection
- a second inspection apparatus that performs more points than the first inspection apparatus on the substrate, a result of overlay inspection by the first inspection apparatus, and a result of overlay inspection by the second inspection apparatus. And generating means for generating correction data for the exposure process.
- the generation unit generates a low-order component of the correction data based on a result of the overlay inspection by the first inspection device, and the second A higher order component of the correction data is generated based on the result of overlay inspection by the inspection apparatus.
- the generation unit may generate the correction component based on a result of overlay inspection by the second inspection apparatus after generating the low-order component.
- the high-order component is generated by calculating each component and removing the low-order component from the components.
- 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 apparatus is disposed outside the coating / developing apparatus.
- the exposure process can be corrected with high precision and high accuracy.
- 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 in the built-in overlay inspection apparatus 11.
- FIG. 3 is a diagram for explaining a measurement point 10 C of a substrate 10 A in a single-type overlay inspection device 12.
- FIG. 4 is a diagram showing a schematic configuration of a built-in type overlay inspection device 11 and a single type overlay inspection device 12.
- the overlay inspection system 10 of the present embodiment includes an overlay inspection apparatus 11 incorporated in the lithography system 20, and a single-type overlay inspection apparatus 12 independent of the lithography system 20. And database 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 and liquid crystal display elements. is there.
- 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) there, and then transported again. 14 and transported to a single overlay inspection device 12 It is.
- a transport container 14 such as a cassette (that is, in units of lots)
- the transport container 14 can store a plurality of (for example, 25) substrates 10A, and is sometimes called a carrier.
- 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 22 is equipped with a loading / unloading section 31, a coater 32, and a developer 33, and further, the built-in overlay inspection device 11 of the overlay inspection system 10 of this embodiment. Then, 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.
- Developer 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 10A taken out from the transfer container 14 is exposed through a resist coating process in the coater 32. It is transported to the apparatus 21, passed through the exposure process in the exposure apparatus 21 and the development process in the development bar 33, and then transported to the built-in overlay inspection apparatus 11, and passed through the inspection process in the overlay inspection apparatus 11. Thereafter, it is collected in the transport container 14.
- the built-in overlay inspection apparatus 11 is incorporated in the lithography system 20 in order to correct the exposure process for each substrate.
- the substrate taken out from the transfer container 14 is approximately 10A thick (resist It is possible to perform overlay inspection of the substrate 10A before it is collected in the transport container 14 through the coating process, exposure process, development process, etc.), and the result is fed back to the exposure process. Can do.
- Exposure process correction means that when a latent image of a circuit pattern is printed on a resist layer, each part of the exposure apparatus 21 (alignment system or AF system) is set so that the process offset between the latent image and the underlying pattern is reduced. Etc.) 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 1OA.
- the state of the underlying layer of the substrate 10A is often different for each substrate 10A due to the effects of changes in the deposition equipment and CMP equipment over time. For this reason, when the circuit pattern is further miniaturized as the semiconductor elements are highly integrated, 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 22.
- the machine controller 23 controls the exposure device 21 and the coater / developer 22 based on instructions from the factory host 24, and the processing contents of each device (11, 21, 31 to 33) and the loading / unloading of the substrate 10A. And instructing the correction of the exposure process and the 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 the present embodiment).
- the built-in overlay inspection apparatus 11 is placed in the coater / developer bar 22 and is recovered in the transport container 14 through the substrate 10A force S lithographic process taken out from the transport container 14. Is built into the route.
- the single type overlay inspection apparatus 12 is disposed outside the coater / developer 22 (that is, outside the above path). Further, the built-in overlay inspection device 11 is connected to the database 13 via a communication means (not shown), and the single overlay inspection device 12 is also connected to the database 13 via a communication means (not shown). Connected as a whole to form a network.
- Both the substrate 10A to be inspected by the built-in overlay inspection apparatus 11 and the substrate 10A to be inspected by the single-layer overlay inspection apparatus 12 are in the same state after development.
- a resist pattern is formed on the surface.
- the resist pattern on the substrate 10A Overlay inspection force between the pattern and the substrate pattern
- the built-in overlay inspection device 11 and the single overlay inspection device 12 are performed inside and outside the lithography system 20, respectively.
- the positions of the measurement points are the four corners of each shot area of the substrate 10A.
- a resist mark indicating the reference position of the resist pattern and a base mark indicating the reference position of the base pattern are formed.
- each of the eight measurement points 10B shown in FIG. The relative shift amount (overlay shift amount) between the registration mark and the base mark is obtained, and the overlay inspection is performed.
- the single type overlay inspection apparatus 12 among the many measurement points of the substrate 10A, the relative displacement amount (overlapping) between the registration mark and the base mark is measured at 52 measurement points 10C shown in FIG. Deviation) is determined and overlay inspection is performed.
- the built-in overlay inspection device 11 and the single overlay inspection device 12 differ in the number of measurement points on the substrate 1 OA, and the number of measurement points in the stand-alone type is larger than in the built-in type.
- 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 or measurement point 10C) 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 image pickup signal from the camera 43
- the image processing unit 44 converts the image signal into a digital image, performs predetermined signal processing on the image, and superimposes the image at the measurement point 10B or the measurement point 10C. The amount of deviation is calculated. Furthermore, the image processing unit 44 generates correction data (described later) for the exposure apparatus 21 based on the overlay deviation amount at each of the plurality of measurement points 10B or measurement points 10C on the substrate 10A.
- the image processing unit 44 of the built-in overlay inspection device 11 and the image processing unit 44 of the stand-alone overlay inspection device 12 generally correspond to “generating means”. As described above, the basic configuration of the built-in overlay inspection apparatus 11 and the single overlay inspection apparatus 12 are the same.
- the built-in overlay inspection device 11 has a limitation in the space that can be incorporated in the lithography system 20, so that the drive unit and prevention of the inspection stage 41 are less than the stand-alone overlay inspection device 12. Shaking bases are downsized. For this reason, the processing capability of the built-in type overlay inspection apparatus 11 is lower than that of the single-type overlay inspection apparatus 12.
- the built-in overlay inspection apparatus 11 is an apparatus provided for making a single wafer for correction in the exposure process.
- the single-type overlay inspection device 12 with high processing capacity gives priority to the accuracy of overlay inspection over processing speed, and increases the number of measurement points on each substrate 10A (see Fig. 3). Increase the accuracy of the inspection.
- the stand-alone overlay inspection apparatus 12 is an apparatus provided for improving the accuracy of exposure process correction, and performs overlay inspection in more points than the built-in overlay inspection apparatus 11.
- 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.
- the recipe for the overlap inspection apparatus 11 is a file in which position information and the like of each measurement point 10B (FIG. 2) of the substrate 10A is registered.
- the recipe for the overlay inspection apparatus 12 is a file in which position information of each measurement point 10C (FIG. 3) on the substrate 10A is registered.
- Each recipe is stored in association with a lot type (combination of product name and process name).
- correction data of the exposure apparatus 21 generated by the image processing unit 44 of the built-in overlay inspection apparatus 11 is also stored in the database 13 in association with the product name, process name, and lot number.
- the factory host 24 is notified via the machine controller 23.
- 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 from the factory host 24 to the machine controller 23 together with various conditions.
- the machine controller 23 issues instructions to the exposure apparatus 21 and the coater / developer 22 based on instructions from the factory host 24, and also issues instructions to a transport mechanism (not shown). Therefore, as instructed by the factory host 24, 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 is collected in the transport container 14. .
- the recipe for the overlay inspection apparatus 11 associated with the product name and process name of the current lot (each of Fig. 2).
- the file containing the position information of the measurement point 10B) is read from the database 13.
- each measurement point 10B is sequentially positioned within the field of view of the apparatus, and the eight measurement points are measured.
- Perform overlay inspection at 10B That is, the image of each measurement point 10B is taken in, and the overlay deviation amount ( ⁇ , ⁇ ) at each measurement point 10B is calculated based on the image.
- the overlay deviation amount (XI, Y1) is stored in the memory in the image processing unit 44 in association with the position coordinates (x, y) of each measurement point 10B.
- the overlay displacement amount (XI, Y1) corresponds to the “result of overlay inspection by the first inspection device” in the claims.
- ⁇ k is a correction coefficient described later, and corresponds to a low-order component of the correction data of the exposure apparatus 21
- the main cause of this is thought to be expansion and contraction during thermal power application to the substrate 10A (that is, the exposure process).
- correction coefficient k is an offset component in the X direction of the overlay deviation amount ( ⁇ , ⁇ ).
- the correction coefficient k is a scaling component in the X direction.
- the correction factor k is the X axis rotation
- correction coefficient k is an offset component in the Y direction.
- Correction factor k is Y
- the correction coefficient k is the Y-axis rotation component.
- the generation of 16 is performed for each of the inter-shot component (wafer component) and the in-shot component of the substrate 10A.
- the position coordinates (x, y) are coordinate values with the center of the substrate 1 OA as the origin.
- the position coordinate (x, y) is a coordinate value with the center of each shot area of the substrate 10A as the origin.
- the measurement result of 5 shots is used, and the substrate 10A In-shot ingredients
- the built-in overlay inspection apparatus 11 When the built-in overlay inspection apparatus 11 generates the low-order component (correction coefficient k to k) of the correction data of the exposure apparatus 21 as described above, the low-order component (correction coefficient k) is generated. ⁇ K) and each
- Measured value (overlapping deviation ( ⁇ , ⁇ )) at measurement point 10B is output to factory host 24 via machine controller 23.
- the low-order components (correction coefficients k to k) are
- the data is also output from the matching inspection device 11 to the database 13 and stored so that it can be referred to by the stand-alone overlay inspection device 12.
- the above-mentioned low-order components (correction coefficients k to k) output from the built-in overlay inspection device 11 to the machine controller 23 are used to improve the non-defective product rate of the current lot.
- This is fed back and used to correct the exposure process for the next substrate 10A (the substrate 10A to be transported to the exposure apparatus 21).
- the machine controller 23 reduces the process offset of the exposure process based on the low-order components (correction coefficients k to k).
- the substrate 10A after the development process is placed in order, and all (for example, 25) substrates 10A in the transport container 14 are placed.
- the overlay inspection similar to the above is repeatedly performed (total inspection). Then, the low-order components (correction coefficients k to k) of the correction data generated on each substrate 10A are machine control ports.
- the lithographic process resist coating process, exposure process, development process, etc.
- the exposure apparatus 21 and the coater / developer 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 processing speed is given priority over the overlay inspection accuracy, and the number of measurement points on each substrate 10A is reduced (Fig. 2). Reference), the required time per substrate can be shortened, and overlay inspection can be performed at high speed so as not to lower the original throughput of the lithography system 20. Therefore, the exposure process can be corrected for each substrate (realization of a single wafer).
- 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 stand-alone overlay inspection apparatus 12.
- the stand-alone overlay inspection apparatus 12 uses the recipe for the overlay inspection apparatus 12 associated with the product name and process name of the current lot (each measurement in FIG. 3).
- the file containing the position information of the point 10C) is read from the database 13. Then, when the substrate 10A newly taken out from the transfer container 14 is placed on the inspection stage 41, according to the position information registered in the recipe, each measurement point 10C is sequentially positioned within the field of view of the apparatus, and 52 locations Perform overlay inspection at measurement point 10C. In other words, the image of each measurement point 10C is captured, and the overlay displacement amount (X2, Y2) at each measurement point 10C is calculated based on the image.
- the overlay displacement amount ( ⁇ 2, ⁇ 2) is stored in the memory in the image processing unit 44 in association with the position coordinates (x, y) of each measurement point 10C.
- the overlay displacement amount (X2, Y2) corresponds to the “result of overlay inspection by the second inspection apparatus” in the claims.
- ⁇ k is a correction coefficient and corresponds to each component of the correction data of the exposure apparatus 21.
- a total of 52 measurement results (combination of overlay displacement ( ⁇ 2, ⁇ 2) and position coordinates (x, y)) are analyzed, and the measurement results are analyzed using the least square method.
- Each component (correction coefficient k to k) of the correction data of the exposure apparatus 21 is calculated so that the influence of variation (that is, the residual error of approximation by the higher-order model) is minimized.
- correction coefficients k to k are the exposure apparatuses already described.
- the correction coefficients k to k are the correction data for the exposure apparatus 21.
- each component of correction data (correction coefficients k to k) is generated by applying a higher-order model.
- each component (correction coefficient k to k) of the inter-shot component of the substrate 10A is generated. Therefore, since the measurement results of 13 shots are used, the solution of the equations (3) and (4) cannot be obtained. ) Can be made very small.
- the stand-alone overlay inspection device 12 uses the built-in overlay detector 11 after generating the low-order components (correction coefficients k to k) by the built-in overlay detector 11. Alignment inspection device 1
- the single-layer overlay inspection apparatus 12 When the single-layer overlay inspection apparatus 12 generates the higher-order component (correction coefficient k to k) of the correction data of the exposure apparatus 21 as described above, the higher-order component (correction coefficient k) ⁇ K) and
- the overlay inspection by the single overlay inspection apparatus 12 is performed by sampling the single substrate 10A in the transport container 14.
- the single overlay inspection apparatus 12 notifies the factory host 24 to that effect. Thereafter, the factory host 24 instructs the automatic transfer device (not shown) or the operator to carry out the transfer container 14.
- 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 (such as a processing process), and in the case of a defective product, it is transferred to the recycling process or the disposal process.
- the machine controller 23 has the above-mentioned higher order components (correction coefficients k to k).
- the exposure process is corrected so that the process offset of the exposure process is reduced.
- the accuracy of overlay inspection is given priority over the processing speed, and the number of measurement points on each substrate 10A is increased (see FIG. 3), the effect of variations in measurement results can be reduced, and the accuracy of overlay inspection can be increased. Therefore, high accuracy of correction of the exposure process is realized. Note that since the single overlay inspection apparatus 12 performs sampling inspection, the original throughput of the lithography system 20 does not decrease even if the number of measurement points on the substrate 10A is increased.
- the built-in overlay inspection device 11 having a low processing capability is provided, and low-order components (correction coefficients k to k) of the correction data described above are provided.
- the exposure process can be corrected on a single wafer.
- a single-type overlay inspection device 12 with high processing capability is provided to generate high-order components (correction coefficients k to k) of the above correction data, thereby enabling high-precision correction of the exposure process. Can be done in units
- the cooperation between the built-in overlay inspection apparatus 11 and the single overlay inspection apparatus 12 maximizes each processing capability, It is possible to realize both single wafer correction and high accuracy in the exposure process without reducing the original throughput of the lithography system 20.
- the process offset of the exposure process can be kept within a stable range. For this reason, the manufacture of devices such as semiconductor elements can be performed more stably.
- correction data is obtained from the result of overlay inspection (overlay deviation (XI, Y1)) by the built-in overlay inspection apparatus 11. After generating low-order components (correction coefficients k to k), a single-type overlay inspection device 12
- each correction data is calculated, and database 13 of each component (correction coefficients k to k) is calculated.
- the position coordinates (x, y) of each measurement point 10C up to the second order are obtained.
- the higher-order model may include third-order or higher terms of the position coordinates (x, y), and may include factors such as exponents and factors such as the direction of the scanning exposure device.
- the force using the measurement result of 13 shots to generate the higher-order component (correction coefficient k to k) of the inter-shot component of the substrate 10A is 6 or more.
- the force using the measurement result of 5 shots to generate the low order component (correction coefficient k to k) of the inter-shot component of the substrate 10A is 3 shots.
- any number can be used.
- three points in the shot may be used.
- the present invention is not limited to this.
- the measurement results of the plurality of substrates 10A in the mouth may be averaged, and correction data for the exposure apparatus 21 may be generated using the average value.
- the number of sheets measured by the single-type overlay inspection apparatus 12 is also two or more.
- the stand-alone overlay inspection apparatus 12 estimates the variation between lots from the past measurement results of a plurality of lots, obtains an estimated value of the measurement result of the next lot, and uses it to correct the exposure apparatus 21 Data may be generated. By using the average value or estimated value, the influence of fluctuation singularity data can be reduced, and more stable correction is possible.
- the image processing unit 44 of the built-in type overlay inspection device 11 and the image processing unit 44 of the stand-alone type overlay inspection device 12 are used for correcting the exposure device 21.
- the present invention is not limited to this.
- the force that the database 13 is superposed on the lithography system 20 and installed outside the inspection system 10 is not limited to this.
- Two inspection devices (11, 1 2) may communicate directly and compare the results of the two types of inspection.
- one built-in type overlay inspection device 11 and one unitary type overlay inspection device 12 are provided, but two inspection devices (11, 12) are provided. Of these, at least one of them may be plural.
Abstract
Description
Claims
Priority Applications (1)
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US11/661,418 US7974804B2 (en) | 2004-10-26 | 2005-10-17 | Registration detection system |
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JP2004310917A JP4449697B2 (ja) | 2004-10-26 | 2004-10-26 | 重ね合わせ検査システム |
JP2004-310917 | 2004-10-26 |
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WO2006046429A1 true WO2006046429A1 (ja) | 2006-05-04 |
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PCT/JP2005/019058 WO2006046429A1 (ja) | 2004-10-26 | 2005-10-17 | 重ね合わせ検査システム |
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US (1) | US7974804B2 (ja) |
JP (1) | JP4449697B2 (ja) |
TW (1) | TW200618063A (ja) |
WO (1) | WO2006046429A1 (ja) |
Families Citing this family (6)
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JP5058744B2 (ja) * | 2006-10-12 | 2012-10-24 | 東京エレクトロン株式会社 | 基板の測定方法、プログラム、プログラムを記録したコンピュータ読み取り可能な記録媒体及び基板の処理システム |
US7619737B2 (en) * | 2007-01-22 | 2009-11-17 | Asml Netherlands B.V | Method of measurement, an inspection apparatus and a lithographic apparatus |
US8175831B2 (en) * | 2007-04-23 | 2012-05-08 | Kla-Tencor Corp. | Methods and systems for creating or performing a dynamic sampling scheme for a process during which measurements are performed on wafers |
US9329033B2 (en) * | 2012-09-05 | 2016-05-03 | Kla-Tencor Corporation | Method for estimating and correcting misregistration target inaccuracy |
EP3077798B1 (en) * | 2013-12-06 | 2022-06-22 | Quidel Corporation | Method for reducing analyzer variability using a normalization target |
WO2018089076A1 (en) * | 2016-11-14 | 2018-05-17 | Kla-Tencor Corporation | Lithography systems with integrated metrology tools having enhanced functionalities |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Family Cites Families (5)
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EP0005462B1 (de) * | 1978-05-22 | 1983-06-08 | Siemens Aktiengesellschaft | Verfahren zum Positionieren von zwei aufeinander einzujustierenden Objekten |
US4327292A (en) * | 1980-05-13 | 1982-04-27 | Hughes Aircraft Company | Alignment process using serial detection of repetitively patterned alignment marks |
US4431923A (en) * | 1980-05-13 | 1984-02-14 | Hughes Aircraft Company | Alignment process using serial detection of repetitively patterned alignment marks |
US5805290A (en) * | 1996-05-02 | 1998-09-08 | International Business Machines Corporation | Method of optical metrology of unresolved pattern arrays |
JP2000150353A (ja) | 1998-11-16 | 2000-05-30 | Seiko Epson Corp | 処理装置及び処理方法 |
-
2004
- 2004-10-26 JP JP2004310917A patent/JP4449697B2/ja active Active
-
2005
- 2005-10-17 US US11/661,418 patent/US7974804B2/en active Active
- 2005-10-17 WO PCT/JP2005/019058 patent/WO2006046429A1/ja active Application Filing
- 2005-10-21 TW TW094136923A patent/TW200618063A/zh unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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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Publication number | Publication date |
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US7974804B2 (en) | 2011-07-05 |
TW200618063A (en) | 2006-06-01 |
TWI373064B (ja) | 2012-09-21 |
JP2006128186A (ja) | 2006-05-18 |
JP4449697B2 (ja) | 2010-04-14 |
US20080215275A1 (en) | 2008-09-04 |
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