WO2018131101A1 - 荷電粒子ビーム装置および光学式検査装置 - Google Patents
荷電粒子ビーム装置および光学式検査装置 Download PDFInfo
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- WO2018131101A1 WO2018131101A1 PCT/JP2017/000698 JP2017000698W WO2018131101A1 WO 2018131101 A1 WO2018131101 A1 WO 2018131101A1 JP 2017000698 W JP2017000698 W JP 2017000698W WO 2018131101 A1 WO2018131101 A1 WO 2018131101A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/22—Optical or photographic arrangements associated with the tube
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/20—Means for supporting or positioning the objects or the material; Means for adjusting diaphragms or lenses associated with the support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/22—Optical or photographic arrangements associated with the tube
- H01J37/226—Optical arrangements for illuminating the object; optical arrangements for collecting light from the object
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
- H01J37/28—Electron or ion microscopes; Electron or ion diffraction tubes with scanning beams
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/302—Controlling tubes by external information, e.g. programme control
- H01J37/3023—Programme control
- H01J37/3026—Patterning strategy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/26—Electron or ion microscopes
- H01J2237/28—Scanning microscopes
- H01J2237/2813—Scanning microscopes characterised by the application
- H01J2237/2817—Pattern inspection
Definitions
- the present invention relates to a charged particle beam apparatus and an optical inspection apparatus, and more particularly to detection of the height of a wafer.
- Patent Document 1 two-dimensional slit light is projected onto an object from obliquely above, reflected light from the object of the projected two-dimensional slit light is detected, and the two-dimensional slit by the detected two-dimensional slit light is detected.
- a technique is disclosed in which an image is converted into an electric signal by a two-dimensional area sensor, and a height of an object is detected by removing a slit portion having a large detection error from the electric signal obtained by the converted two-dimensional slit image.
- Patent Document 2 a slit that cannot be detected by pattern matching when only a part of the multi-slit image is irradiated in the height measurement at a portion near the edge of the object to be measured is identified.
- a technique for calculating the number that cannot be detected and complementing an electrical signal of an ideal slit image is disclosed.
- Patent Document 1 it is disclosed that a slit portion having a large detection error is excluded from an electric signal based on a two-dimensional slit image. It is not possible to obtain an image which is a premise for processing.
- Patent Document 2 is disadvantageous for high throughput because of the time required to identify and complement slits that cannot be detected.
- An object of the present invention is to provide a technique for detecting the height of a wafer up to the vicinity of the edge of the wafer with high accuracy and high speed.
- the first pattern is projected from the oblique direction to the wafer surface with the first pattern on one side and the second pattern on the other side across the target area on the wafer.
- the image of at least any one of the 2nd pattern can be utilized, and the above-mentioned subject can be solved.
- the present invention it is possible to provide a technique for detecting the height of a wafer up to the vicinity of the edge of the wafer with high accuracy and high speed. As a result, the die can be taken close to the edge of the wafer.
- FIG. 1 is a schematic diagram showing a device configuration of a CD-SEM device in a first embodiment of the present invention. It is the schematic which shows the structure of the optical height detection optical system in the Example of this invention. It is the schematic which shows the structure of the optical height detection optical system in the Example of this invention. It is the schematic explaining the relationship between the height of a target object and the shift amount of a slit image in the optical height detection optical system of the Example of this invention. It is a top view of the two-dimensional slit of the Example of this invention. It is a figure which shows the image of the two-dimensional slit projected on the surface of the to-be-measured object.
- FIG. 1 is a schematic diagram showing a device configuration of a CD-SEM (Critical Dimension Scanning Electron Microscope) device 100 which is a charged particle beam device according to a first embodiment of the present invention.
- the CD-SEM apparatus 100 obtains an electron beam image of an object to be measured (measuring object, object) 115 by a scanning electron microscope for setting and monitoring conditions of a semiconductor manufacturing process, and performs image processing to obtain an object to be measured.
- the line width and hole diameter of the fine pattern of the object 115 are measured.
- the measurement object 115 is, for example, a semiconductor wafer on which a fine pattern is formed.
- the CD-SEM apparatus 100 obtains an electron beam image of the measurement object 115 and performs image processing, a focus control system that performs focusing of the scanning electron microscope, and the height of the measurement object 115.
- An optical height detection system for detecting the above and an overall control system.
- the scanning electron microscope system includes an electron beam source 111 that emits an electron beam, a condenser lens 112 that focuses the electron beam emitted from the electron beam source 111, a deflector 113 that two-dimensionally scans the focused electron beam, and an electron An objective lens 114 that focuses the line on the measurement object 115, a Z stage 122 on which the measurement object 115 is placed, and an XY stage 116 that moves the Z stage 122 movable in the height direction in a two-dimensional horizontal direction.
- a laser length measuring device 117 for measuring the position of the measurement object 115 moved by the XY stage 116, and secondary electron detection for detecting secondary electrons emitted from the measurement object 115 by irradiation of an electron beam.
- an A / D converter 119 for A / D converting the detected secondary electron signal, and an electron beam image (SEM image) by the A / D converted secondary electron signal Has an image processing unit 120 for measuring the length of the width or diameter of the pattern in the specified image.
- the optical height detection system includes a projection optical system, a detection optical system, a two-dimensional area sensor, and a height detection means.
- the optical height detection system projects first and second patterns, which will be described later, on the surface of the measurement object 115 from an oblique direction, and detects light reflected by the measurement object 115.
- the optical height detection system further includes an electric signal detector 131 for detecting an electric signal from the two-dimensional area sensor based on an image of at least one of the first and second patterns, and the first and second patterns.
- a height calculation processor 132 that selects at least one of the images and calculates the height of the object 115 to be measured.
- the focus control system adjusts the height of the measurement target object 115 by the Z stage 122 based on the height information of the measurement target object 115 output from the height calculation processor 132, so that the objective lens 114 is adjusted.
- a focus controller (focus control means) 121 that performs focusing, and an automatic focus controller (auto focus) that detects an electron beam image at a height adjusted by the focus controller 121 and detects a focal point position from the electron beam image. Control means) 123.
- the overall control system performs overall control of the scanning electron microscope system, the focus control system, and the optical height detection system, and the result processed by the image processing means 120 together with the coordinate position of the object to be measured 115 or the monitor 142 or An overall control unit 141 that outputs to a storage 143 that is a storage unit is provided.
- the optical height detection optical system includes a projection optical system 251 and a detection optical system 252.
- FIG. 2B is a plan view of the optical system shown in the front view in FIG.
- the projection optical system 251 includes a white light source 261 such as a halogen lamp, a condenser lens 263 that condenses the white light from the white light source 261, and light to be collected by the condenser lens 263 to be described later on the measurement target 115.
- a white light source 261 such as a halogen lamp
- condenser lens 263 that condenses the white light from the white light source 261, and light to be collected by the condenser lens 263 to be described later on the measurement target 115.
- a two-dimensional slit 264 for projecting the first and second patterns for projecting the first and second patterns
- a polarizing filter 265 installed so as to transmit S-polarized light out of the light passing through the two-dimensional slit 264, and the light passing through the polarizing filter 265
- a projection lens 266 that focuses and forms first and second patterns, which will be described later, in the vicinity of the measurement target 115.
- the polarization filter 265 is more easily reflected on the surface of the transparent film than the P-polarized light.
- the influence of multiple reflections on a transparent film is reduced.
- the light source a single wavelength laser light source or a light emitting diode can be used instead of the white light source 261.
- multiple reflected light in the transparent film causes interference, or the transparent film thickness changes. May affect the reflectivity and increase the detection error.
- the detection optical system 252 passes through a band-pass filter 262 that transmits light in a specific wavelength region out of the light irradiated from the projection optical system 251 and regularly reflected on the measurement target 115, and the band-pass filter 262.
- the detection lens 267 that collects the collected light and forms the intermediate image 269, the mirror 268 that changes the traveling direction of the specularly reflected light that has passed through the detection lens 267, and the intermediate image 269 formed by the detection lens 267 are enlarged.
- the magnifying lens 270 that forms an image on the two-dimensional area sensor 271 and the two-dimensional area sensor 271 are included.
- the detection optical system 252 can capture first and second patterns described later.
- the band-pass filter 262 limits the wavelength band of the light from the white light source 261 to reduce chromatic aberration due to the detection lens 267 and the magnifying lens 270 and reduce the wavelength dependency of the image formed on the two-dimensional area sensor 271. .
- X s direction 101 is a direction of movement of the XY stage 116 It is installed with an inclination.
- the direction of movement of the XY stage 116 which is perpendicular to the X s direction 101 and Y s direction 102.
- the projection optical system 251 and detection optics 252 are disposed 45 ° inclined to against X s direction 101.
- FIG. 3 is a schematic diagram for explaining the relationship between the height of the object and the shift amount of the slit image in the optical height detection optical system of the present embodiment.
- the Zs direction 301 corresponds to the moving direction of the Z stage 122.
- FIG. 3 shows that a direction orthogonal to the X s direction 101 and Y s direction 102, and Z s direction 301.
- the Zs direction 301 corresponds to the moving direction of the Z stage 122.
- the measurement object 115 Changes by ⁇ Z s
- the two-dimensional slit image on the two-dimensional area sensor 271 shifts by 2 m ⁇ Z s ⁇ sin ⁇ .
- the height calculation processor 132 calculates the shift amount of the two-dimensional slit image based on the electric signal of the two-dimensional slit image obtained by the two-dimensional area sensor 271, and from the calculated shift amount, ⁇ Z s that is the amount of change in the height of the measurement object 115 is calculated.
- ⁇ can be set to 70 °.
- FIG. 4 is a plan view of the two-dimensional slit 264 as viewed from the measured object 115 side.
- the two-dimensional slit 264 has a first slit group 402 on one side and a second slit group on the other side across an X p axis 272 and a Y p axis 273 passing through the optical axis 401 of the projection optical system 251. 403.
- each of the first slit group 402 and the second slit group 403 includes four slits.
- each slit is arranged in the transversal direction of the slit contained in each.
- each slit of the first slit group 402 and the second slit group 403 is substantially parallel to the X p axis 272.
- Each of the first slit group 402 and the second slit group 403 includes at least one slit, and the number of slits can be increased in accordance with the required stage height control accuracy.
- FIG. 5 is a diagram showing an image of the two-dimensional slit 264 projected on the surface of the measurement object 115.
- the Y p ′ axis 501 in FIG. 5 corresponds to the projection of the Y p axis 273 in FIG. 4 onto the surface of the measurement object 115.
- the Y p ′ axis 501 corresponds to the projection of the optical axis 401 onto the surface of the measurement object 115.
- the X p ′ axis 505 corresponds to the projection of the X p axis 272 in the direction of the optical axis 401 on the surface of the measurement object 115.
- the X p axis 272 and the X p ′ axis 505 have an inverted image relationship, and thus their directions are reversed.
- the image of the first slit group 402 on one side of the optical axis 401, the X p ′ axis 505, and the Y p ′ axis 501 of the projection optical system 251 is sandwiched by the projection optical system 251.
- the second pattern 503 which is an image of the second slit group 403 is projected on the other side. In this way, the first pattern 502 is projected closer to the projection optical system 251 than the second pattern 503.
- the first pattern 502 is on one side and the second pattern is on the other side.
- a pattern 503 is projected.
- the first pattern 502 and the second pattern 503 are obtained by enlarging and projecting the first slit group 402 and the second slit group 403 by the projection lens 266.
- the projection optical system 251 projects at an incident angle of ⁇ as shown in FIG. 3, the first slit group 402 is enlarged by 1 / sin (90 ° ⁇ ) times in the Y p ′ axis 501 direction.
- the second slit group 403 is projected onto the surface of the measurement object 115.
- Distance d 2 of the first pattern 502 and X p axis spacing d 1, and a second pattern 503 of 272 and X p axis 273, for example, can each be on 1 mm.
- the period in the short direction of the slits included in each of the first pattern 502 and the second pattern 503, which is the pitch of each of the first pattern 502 and the second pattern 503, is the first pattern 502 and the second pattern 503. It is smaller than d 1 + d 2 which is the interval between the two patterns 503. 5, the pitch p 1 of the first pattern 502, the pitch p 2 of the second pattern 503, illustrating the.
- a region where the scanning electron microscope system of the CD-SEM apparatus 100 scans an electron beam that is a charged particle beam is, for example, a region 504 surrounded by a broken line in FIG.
- the size of the region in which the scanning electron microscope system scans the electron beam, which is a charged particle beam varies depending on the size of the region where an image is desired to be obtained.
- the height of the surface of the measurement object 115 to be described later is obtained by positioning at least a part of the region where the scanning electron microscope system scans the electron beam between the first pattern 502 and the second pattern 503.
- FIGS. 7 (a) is X s end near 601 of FIG. 6, the state of projection in FIG. 7 (b) with Y s end near 602 of FIG. 6, and FIG. 7 (c) in FIG. 6
- FIG. 7D shows the state of projection near the ⁇ 45 ° end 604 in FIG. 6.
- the Y s end around 602 the inside of the wafer edge 701 is on the object to be measured 115 second pattern 503 is projected.
- the Y s end around 602 the first pattern 502 is not projected onto the object to be measured 115. Therefore, the Y s end around 602, by measuring the position of the second pattern 503, it is possible to measure the height of the measurement object 115.
- the first pattern 502 is projected inside the wafer edge 701 on the object to be measured 115.
- the second pattern 503 is not projected onto the measurement object 115 in the vicinity of the 45 ° end 603. Therefore, in the vicinity of the 45 ° end 603, the height of the measurement object 115 can be measured by measuring the position of the first pattern 502.
- the second pattern 503 is projected inside the wafer edge 701 on the object to be measured 115.
- the first pattern 502 is not projected onto the measurement object 115. Therefore, in the vicinity 604 of ⁇ 45 ° end, the height of the measurement object 115 can be measured by measuring the position of the second pattern 503.
- the height of the measurement object 115 can be measured from at least one of the first pattern 502 and the second pattern 503.
- at least one of the first pattern 502 and the second pattern 503 can maintain the number of slits included in the image, it is possible to save time required for identifying and complementing slits that cannot be detected.
- FIG. 8 shows a first pattern 801 and a second pattern 802 projected onto the two-dimensional area sensor 271 as viewed from the magnifying lens 270 side.
- the first pattern 801 corresponds to the projection pattern of the first slit group 402
- the second pattern 802 corresponds to the projection pattern of the second slit group 403.
- the projection optical system 251 and the detection optical system 252 sandwich the optical axis 401 and Y p ′′ axis 275 of the projection optical system 251 with an image of the first slit group 402 on one side.
- a certain first pattern 801 is projected on the other side
- a second pattern 802 that is an image of the second slit group 403 is projected on the other side.
- An electric signal resulting from at least one of the first pattern 801 and the second pattern 802 from the two-dimensional area sensor 271 is detected by the electric signal detector 131.
- the electric signal detector 131 can obtain an electric signal caused by the first pattern 801 on the corresponding lines on the plurality of lines 803 along the Y p ′′ axis 275 direction shown in FIG. 8.
- the electrical signal detector 131 can obtain an electrical signal caused by the second pattern 802 on the lines corresponding to the plurality of lines 804 along the Y p ′′ axis 275 direction shown in FIG. .
- the first pattern 801 that is an image of the first slit group 402 on one side and the second pattern on the other side across the Y p ′′ axis 275 passing through the optical axis 401 of the projection optical system 251. Since the second patterns 802 that are images of the two slit groups 403 are respectively projected, the plurality of lines 803 along the Y p ′′ axis 275 direction are not affected by the second pattern 802. An electric signal resulting from the first pattern 801 can be obtained. In addition, on the plurality of lines 804 along the Y p ′′ axis 275 direction, an electric signal due to the second pattern 802 can be obtained without being affected by the first pattern 801.
- the height calculation processor 132 selects at least one image of the first pattern 801 and the second pattern 802 and calculates the height of the measurement object 115. Specifically, the height calculation process 132, Y p '' axis 275 on the plurality of lines 803 along the direction, or Y p 'on a plurality of lines 804 along the' axis 275 direction, the number of image of the slit Is selected, and the height of the object to be measured 115 is calculated from the change in the peak position corresponding to the slit position in the selected signal.
- a height calculation process 132, Y p '' axis 275 on the plurality of lines 803 along the direction, or Y p 'on a plurality of lines 804 along the' axis 275 direction the number of image of the slit
- the height of the measurement object 115 is calculated from the change in the peak position corresponding to the slit position in the remaining signal.
- the height calculation processor 132 can select the first pattern 801 or the second pattern 802 from which images of all the slits in the slit group are obtained.
- the selection information of the first pattern 801 or the second pattern 802 associated with the movement destination of the XY stage 116 in advance Is stored in the storage 143, and the height calculation processor 132 refers to the information and selects the first pattern 801 or the second pattern 802 according to the movement of the XY stage 116. The one from which images of all the slits are obtained can be selected.
- the height calculation processor 132 can select the first pattern 801 or the second pattern 802 from the Y p ′′ axis 275 shown in FIG. 8 of the two-dimensional area sensor 271. If the integration of the intensity signal from the right region is less than a preset threshold value, the first pattern 801 is selected, and the intensity signal from the region left of the Y p ′′ axis 275 is selected. This integration can be realized by selecting the second pattern 802 when the integration is less than a preset threshold value.
- the first pattern 502 is on one side and the first pattern 502 is on the other side across the Y p ′ axis 501, which is the projection of the optical axis 401 of the projection optical system 251 onto the surface of the measurement object 115.
- the first pattern 801 can be obtained by simple area setting such as integration of the intensity signal of the right half area of the two-dimensional area sensor 271 and integration of the intensity signal of the left half area. Alternatively, it is possible to easily select a signal in which the number of slit images is missing without specifying which slit image is missing in the second pattern 802.
- ⁇ Z s which is the amount of change in height, is calculated from the measurement of the change in the peak position of the four slit images.
- ⁇ Z s is also calculated from the measurement of the valley position between the peaks of the slit image. s can be calculated.
- the present embodiment can provide a technique for detecting the height up to the vicinity of the edge of the object to be measured with high accuracy and high speed. As a result, the die can be taken close to the edge of the wafer.
- FIG. 9 is a schematic diagram showing a device configuration of a CD-SEM device 900 according to the second embodiment of the present invention.
- the difference between the CD-SEM apparatus 900 of this embodiment and the CD-SEM apparatus 100 of the first embodiment described above is that, in the focus control system, the CD-SEM apparatus 100 outputs from the height calculation processor 132. While the objective lens 114 is focused by adjusting the height of the measurement object 115 with the Z stage 122 based on the height information of the measurement object 115, the CD-SEM apparatus 900 The focus controller 121 adjusts the excitation current of the objective lens 114 to focus the objective lens 114. In the CD-SEM apparatus 900 of this embodiment, the height of the measurement object 115 is not adjusted by the Z stage 122 unlike the CD-SEM apparatus 100 of the first embodiment. The variation of the height of the object 115 is larger than that of the CD-SEM apparatus 100.
- the CD-SEM apparatus 900 taking into account the variation in the position of the first pattern 801 and the second pattern 802 due to the variation in the height of the measurement object 115 during the operation of the CD-SEM apparatus 900, It is desirable to make d 1 and d 2 in FIG. 5 larger than the CD-SEM apparatus 100.
- the CD-SEM apparatus 900 of the present embodiment as well, from the first pattern 801 and the second pattern 802 to the vicinity of the edge of the object to be measured with high accuracy and high speed, similarly to the CD-SEM apparatus 100.
- Technology for height detection can be provided. As a result, the die can be taken close to the edge of the wafer.
- FIG. 10 is a schematic diagram showing the apparatus configuration of an optical inspection apparatus 1000 according to the third embodiment of the present invention.
- the difference between the optical inspection apparatus 1000 of this embodiment and the CD-SEM apparatus 100 of the first embodiment described above is that the CD-SEM apparatus 100 is secondary emitted from the object to be measured 115 by electron beam irradiation. In contrast to the detection of electrons, the optical inspection apparatus 1000 detects scattered light emitted from the measurement object 115 by irradiation with laser light. In the optical inspection apparatus 1000 of the present embodiment as well, from the first pattern 801 and the second pattern 802 to the vicinity of the edge of the object to be measured with high accuracy and high speed, similarly to the CD-SEM apparatus 100. Technology for height detection can be provided. As a result, the die can be taken close to the edge of the wafer.
- FIG. 11 is a schematic diagram showing an optical system for inspection of the optical inspection apparatus 1000.
- the optical inspection apparatus 1000 includes a laser light source 1101, a beam shaping unit 1107 for shaping the laser light 1106 from the laser light source 1101 into a thin line shape, and irradiation of the laser light 1102 shaped into a thin line shape.
- Scattered light detection systems 1001A and 1001B for detecting scattered light caused by foreign matters or defects on the surface.
- the scattered light detection system 1001B is omitted.
- the regularly reflected reflected light 1103 generated on the surface of the measurement object 115 by the irradiation of the laser light 1102 does not enter either the scattered light detection system 1001A or the scattered light detection system 1001B. That is, the optical inspection apparatus 1000 is dark field illumination.
- the measurement object 115 is, for example, a semiconductor wafer on which a fine pattern is formed.
- a rotation stage for correcting the angular deviation of the measurement object 115 can be added.
- the scattered light detection system 1001A includes an objective lens 1104A, an imaging lens 1105A, and a one-dimensional sensor array 1118A.
- the scattered light detection system 1001B includes an objective lens 1104B, an imaging lens 1105B, and a one-dimensional sensor array 1118B. Whereas the optical axis of the scattered light detecting system 1001A is substantially perpendicular to the surface of the object to be measured 115, the optical axis of the scattered light detection system 1001B is a vertical direction of the surface of the object to be measured 115 Z s direction Inclined with respect to 301. Therefore, the scattered light detection system 1001A and the scattered light detection system 1001B detect scattered light in different directions.
- a laser light source 1101, a scattered light detecting system 1001A, and the scattered light detecting system 1001B, are arranged in the X s direction 101. Projection to the object to be measured 115 of the optical path of the laser beam 1102 and the reflected light 1103, along the X s direction 101.
- the objective lens 1104A of the scattered light detection system 1001A and the objective lens 1104B of the scattered light detection system 1001B are arranged so as not to interfere with the field of view of the projection optical system 251.
- the scattered light detection system 1001A detects the scattered light by performing photoelectric conversion on the one-dimensional sensor array 1118A.
- the scattered light detection system 1001B detects the scattered light by performing photoelectric conversion on the one-dimensional sensor array 1118B.
- the optical inspection apparatus 1000 includes an A / D converter 1119 that digitizes the output of the one-dimensional sensor array 1118A and the output of the one-dimensional sensor array 1118B, and the digitized scattered light intensity information. And image processing means 1120 for extracting information on defects and foreign matters on the measurement object 115.
- the focus controller 121 uses the Z stage 122 to measure the height of the measurement object 115 based on the height information of the measurement object 115 output from the height calculation processor 132. Is adjusted so that the scattered light detection system 1001A and the scattered light detection system 1001B are focused on the measurement object 115.
- FIG. 12 shows an image of a two-dimensional slit projected on the surface of the measurement object 115.
- the scanning electron microscope system of the CD-SEM apparatus 100 is replaced with an area 504 that is an area for scanning an electron beam, which is a charged particle beam, in FIG.
- the irradiation region 1201 of the laser beam 1102 formed into a thin line shape and the visual field 1202 for inspection are between the first pattern 502 and the second pattern 503. Accordingly, the first pattern 502 is projected on one side and the second pattern 503 is projected on the other side by the projection optical system 251 with the inspection visual field 1202 on the measurement object 115 interposed therebetween.
- the visual field 1202 for inspection corresponds to the visual field of the scattered light detection system 1001A and the scattered light detection system 1001B. Therefore, scattered light from a foreign substance or defect present in the irradiation region 1201 is measured by the scattered light detection system 1001A or the scattered light detection system 1001B depending on the direction of the scattered light.
- the inspection visual field 1202 does not overlap the first pattern 502 and the second pattern 503. Thereby, the light from the projection optical system 251 can be prevented from entering the scattered light detection system 1001A and the scattered light detection system 1001B, and the surface inspection of the measurement object 115 can be made highly accurate.
- a projection optical system 251 and detection optics 252 may be disposed 45 ° inclined to against X s direction 101 .
- the distance d 2 of the first pattern 502 and X p axis spacing d 1, and a second pattern 503 of 272 and X p axis 273, for example, can each be on 1.5mm .
- the optical inspection apparatus 1000 uses the image of at least one of the first pattern 502 or the second pattern 503 to increase the height of the Z stage 122. Can be adjusted. Furthermore, the optical inspection apparatus 1000 of the present embodiment uses the image of at least one of the first pattern 502 and the second pattern 503 to detect the measurement target object 115 generated when the XY stage 116 is moved. Variation in height can be suppressed.
- the field of the projection optical system 251 can be used effectively, and the objective lens 1104A and the objective lens 1104B. Even if the projection optical system 251 and the visual field of the projection optical system 251 are arranged so as not to interfere with each other, highly accurate height measurement can be realized.
- the irradiation region 1201 or the field of view 1202 of the inspection is associated with the position on the measurement object 115.
- Information on the selection of the first pattern 801 or the second pattern 802 is stored in the storage 143, and the height calculation processor 132 refers to the information and determines the first pattern according to the movement of the XY stage 116. By selecting 801 or the second pattern 802, it is possible to select the one in which images of all the slits in the slit group are obtained.
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Abstract
Description
Claims (15)
- ステージと、
前記ステージに載置されたウェハ上への荷電粒子ビームの走査領域の少なくとも一部を挟んで、一方の側に第1のパターンを、他方の側に第2のパターンを、前記ウェハの表面に対して斜め方向から投射する投射光学系と、
前記第1および第2のパターンを撮像する撮像装置と、を有し、
前記第1および第2のパターンの像の内の少なくとも一方を選択してウェハの高さを測定することを特徴とする荷電粒子ビーム装置。 - 請求項1に記載の荷電粒子ビーム装置において、
前記第1または第2のパターンの像の欠けに応じて、前記第1および第2のパターンの像の内の少なくとも一方を選択してウェハの高さを測定することを特徴とする荷電粒子ビーム装置。 - 請求項1に記載の荷電粒子ビーム装置において、
前記投射光学系は、第1のスリット群および第2のスリット群を介して、前記第1のパターンおよび前記第2のパターンを投射することを特徴とする荷電粒子ビーム装置。 - 請求項3に記載の荷電粒子ビーム装置において、
前記第1および第2のスリット群のそれぞれには、それぞれに含まれるスリットの短手方向に各スリットが配列されていることを特徴とする荷電粒子ビーム装置。 - 少なくとも高さ方向に可動なステージと、
前記ステージに載置されたウェハ上への荷電粒子ビームの走査領域の少なくとも一部を挟んで、一方の側に第1のパターンを、他方の側に第2のパターンを、前記ウェハの表面に対して斜め方向から投射する投射光学系と、
前記投射光学系から投射され、前記ウェハの表面で反射した光を検出する検出光学系と、を有し、
前記ウェハ上で、前記第2のパターンは前記第1のパターンよりも前記投射光学系に近い前記ウェハ上の領域に投射され、且つ前記投射光学系の光軸の前記ウェハの表面への射影を挟んで、一方の側に前記第1のパターンが、他方の側に前記第2のパターンが投影されることを特徴とする荷電粒子ビーム装置。 - 請求項5に記載の荷電粒子ビーム装置において、
前記第1および第2のパターンのそれぞれのピッチは、前記第1のパターンと前記第2のパターンの間隔よりも小さいことを特徴とする荷電粒子ビーム装置。 - 請求項5に記載の荷電粒子ビーム装置において、
前記第1および第2のパターンの内の少なくとも一方に基づいて前記ステージの高さを調節することを特徴とする荷電粒子ビーム装置。 - 請求項7に記載の荷電粒子ビーム装置において、
前記第1または第2のパターンの像の欠けに応じて、前記第1および第2のパターンの内の少なくとも一方に基づいて前記ステージの高さを調節することを特徴とする荷電粒子ビーム装置。 - 少なくとも高さ方向に可動なステージと、
前記ステージに載置されたウェハ上の検査の視野を挟んで、一方の側に第1のパターンを、他方の側に第2のパターンを、前記ウェハの表面に対して斜め方向から投射する投射光学系と、
前記第1および第2のパターンを撮像する撮像装置と、を有し、
前記第1および第2のパターンの像の内の少なくとも一方を選択して前記ステージの高さを調節することを特徴とする光学式検査装置。 - 請求項9に記載の光学式検査装置において、
前記検査の視野の位置に応じて、前記第1および第2のパターンの像の内の少なくとも一方を選択して前記ステージの高さを調節することを特徴とする光学式検査装置。 - 請求項9に記載の光学式検査装置において、
前記第1または第2のパターンの像の欠けに応じて、前記第1および第2のパターンの像の内の少なくとも一方を選択して前記ステージの高さを調節することを特徴とする光学式検査装置。 - 請求項9に記載の光学式検査装置において、
前記ウェハ上で、前記第1のパターンは前記第2のパターンよりも前記投射光学系に近い前記ウェハ上の領域に投射されることを特徴とする光学式検査装置。 - 請求項10に記載の光学式検査装置において、
前記投射光学系の光軸の前記ウェハの表面への射影を挟んで、一方の側に前記第1のパターンが、他方の側に前記第2のパターンが投影されることを特徴とする光学式検査装置。 - 請求項9に記載の光学式検査装置において、
選択した像に含まれる複数の強度ピークの位置の変化に基づいて前記ステージの高さを調節することを特徴とする光学式検査装置。 - 請求項14に記載の光学式検査装置において、
前記散乱光を第1の方向で検出する第1の検出光学系と、
前記散乱光を第2の方向で検出する第2の検出光学系と、を有することを特徴とする光学式検査装置。
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