WO2021117182A1 - 荷電粒子線絞りへの入射角調整機構、および荷電粒子線装置 - Google Patents
荷電粒子線絞りへの入射角調整機構、および荷電粒子線装置 Download PDFInfo
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- WO2021117182A1 WO2021117182A1 PCT/JP2019/048652 JP2019048652W WO2021117182A1 WO 2021117182 A1 WO2021117182 A1 WO 2021117182A1 JP 2019048652 W JP2019048652 W JP 2019048652W WO 2021117182 A1 WO2021117182 A1 WO 2021117182A1
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- particle beam
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- 239000002245 particle Substances 0.000 title claims abstract description 396
- 238000004070 electrodeposition Methods 0.000 claims description 10
- 230000001678 irradiating effect Effects 0.000 claims 4
- 230000004075 alteration Effects 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 13
- 230000003287 optical effect Effects 0.000 description 29
- 125000006850 spacer group Chemical group 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 230000005284 excitation Effects 0.000 description 10
- 230000001133 acceleration Effects 0.000 description 6
- 239000002131 composite material Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000010884 ion-beam technique Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
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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
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/147—Arrangements for directing or deflecting the discharge along a desired path
- H01J37/15—External mechanical adjustment of electron or ion optical components
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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
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/09—Diaphragms; Shields associated with electron or ion-optical arrangements; Compensation of disturbing fields
-
- 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
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/153—Electron-optical or ion-optical arrangements for the correction of image defects, e.g. stigmators
-
- 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
- H01J37/21—Means for adjusting the focus
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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
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/04—Means for controlling the discharge
- H01J2237/045—Diaphragms
- H01J2237/0451—Diaphragms with fixed aperture
- H01J2237/0453—Diaphragms with fixed aperture multiple apertures
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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
- H01J2237/04—Means for controlling the discharge
- H01J2237/045—Diaphragms
- H01J2237/0456—Supports
- H01J2237/0458—Supports movable, i.e. for changing between differently sized apertures
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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
- H01J2237/06—Sources
- H01J2237/063—Electron sources
-
- 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
- H01J2237/15—Means for deflecting or directing discharge
- H01J2237/1501—Beam alignment means or procedures
-
- 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
- H01J2237/153—Correcting image defects, e.g. stigmators
- H01J2237/1534—Aberrations
Definitions
- the present invention relates to a charged particle beam device that irradiates a sample with a charged particle beam.
- Charged particle beam devices such as scanning electron microscope (SEM) and focused ion beam device (FIB: Focused Ion Beam System) focus charged particle beams on a sample for nano-level observation, analysis, and processing. I do.
- SEM scanning electron microscope
- FFIB focused ion beam device
- These charged particle beam devices are widely used in the fields of semiconductors, materials, and biotechnology, which require nano-level observation, analysis, and processing. Further, in various fields, including the semiconductor field where miniaturization is advancing, further improvement in image resolution and processing accuracy are required.
- Patent Document 1 has an incident plate and an injection plate, one of which has a circular opening and the other has an annular opening, and a voltage is applied between the incident plate and the injection plate.
- a spherical aberration corrector that can be realized with a simple structure is disclosed by providing divergence that eliminates positive spherical aberration by an electric field formed in the ring opening.
- Non-Patent Document 1 shows that the depth of focus is improved by using an annular diaphragm.
- Patent Document 2 discloses a method of arranging a charged particle beam drawing having a ring shape at an appropriate position of a charged particle beam device.
- the diaphragm of the charged particle beam device generally has a circular hole-shaped opening, but a ring-shaped diaphragm is also known.
- Non-Patent Document 1 shows that the depth of focus is improved by using an annular diaphragm. Further, Patent Document 1 shows that a spherical aberration correction effect can be obtained by combining a ring-shaped electrode and a circular hole-shaped electrode and applying a voltage between the two electrodes.
- the depth of focus can be sufficiently improved or the spherical aberration can be eliminated. It was found that it may not be possible.
- the charged particle beam in the charged particle beam device does not travel along the ideal optical axis extending in the vertical direction, but actually deviates from the optical axis in the emission direction of the primary electron emitted from the charged particle beam source. Or, due to the influence of mounting misalignment of the lens, etc., it is moving in a direction deviated from the optical axis.
- the influence of the above-mentioned deviation is absorbed. Therefore, even if the charged particle beam is adjusted so as to pass through the center of the aperture or electrode having a ring-shaped slit, the charged particle beam is not vertically incident on the plane on which the aperture or electrode is formed. Occurs normally. In the case of a diaphragm or electrode having an annular slit, the central portion having the highest beam density is shielded, and only the peripheral portion having the lowest beam density passes through the annular slit.
- the present invention provides a charged particle beam apparatus capable of stably obtaining a depth of focus improving effect or a spherical aberration correction effect.
- the charged particle beam device is provided with a means for adjusting the angle of incidence of the charged particle beam on a throttle having a ring-shaped slit or an electrode having a ring-shaped slit.
- the incident angle at which the charged particle beam is incident on the diaphragm or electrode having a ring-shaped slit can be made closer to vertical, the effect of improving the depth of focus or the effect of correcting spherical aberration can be stably obtained.
- FIG. It is the schematic of the charged particle beam apparatus of Example 1.
- FIG. It is a figure for demonstrating the structure of the charged particle beam diaphragm. It is a figure for demonstrating the structure of the charged particle beam diaphragm. It is a figure for demonstrating the structure of the charged particle beam diaphragm. It is a flowchart which shows the adjustment procedure of the incident angle of the charged particle beam to the diaphragm which has a ring-shaped slit.
- FIG. It is a figure for demonstrating the structure of the charged particle beam electrode. It is a figure for demonstrating the structure of the charged particle beam electrode. It is a figure for demonstrating the structure of the charged particle beam electrode.
- FIG. It is a figure for demonstrating the structure of the charged particle beam electrode. It is the schematic of the charged particle beam apparatus of Example 3. FIG. It is a flowchart which shows the adjustment procedure of the incident angle of the charged particle beam to the electrode which has a ring-shaped slit.
- FIG. 1 shows an outline of the charged particle beam apparatus according to the first embodiment.
- the main part of the charged particle beam device is a charged particle beam source 101 that generates a charged particle beam, an accelerating electrode 102 that accelerates the charged particle beam emitted from the charged particle beam source 101, and an objective lens 105 from the accelerating electrode 102.
- the beam tube 112 arranged near the lower end, the first and second condenser lenses 103 and 104 that focus the charged particle rays emitted from the charged particle source 101, and the charged particles emitted from the charged particle source 101.
- a first charged particle beam drawing 118 having a ring-shaped slit that shields a part of the particle, and a second having a circular hole-shaped opening that shields a part of the charged particles emitted from the charged particle source 101.
- the aperture holder 120 that holds the first and second charged particle beam apertures 118, 119, the aperture inclination mechanism 121 that inclines the aperture holder 120, and the aperture position that moves the aperture holder 120 in parallel.
- a third deflector group 142 that scans the charged particle beam on the sample, an objective lens 105 that focuses the charged particle beam on the sample, a sample chamber 115 in which the sample 114 is placed, and a secondary charge emitted from the sample. It has a detector 116 that detects particles.
- the controllers for controlling each component of the charged particle optical system described above the charged particle source controller 151 for controlling the charged particle source 101, the accelerating electrode controller 152 for controlling the accelerating electrode 102, and the second Controls the first and second condenser lens controllers 153 and 154 that control the first and second condenser lenses 103 and 104, the aperture tilt mechanism controller 156 that controls the aperture tilt mechanism 121, and the aperture position adjustment mechanism 122.
- the aperture position adjustment mechanism controller 157 the first deflector group controller 161 that controls the first deflector group 140, and the second deflector group controller 162 that controls the second deflector group 141.
- These controllers are controlled by an integrated computer 170 that controls the operation of the entire charged particle beam device and constructs a charged particle beam image.
- the integrated computer 170 is connected to the controller (keyboard, mouse, etc.) 171, and the display 172.
- the operator inputs various instructions such as irradiation conditions and the position condition of the charged particle beam aperture from the controller 171, and the image acquired on the display 172. And the control screen can be displayed.
- the objective lens 105 includes a type of lens that does not leak the magnetic field outside the magnetic path, but may be a type that leaks the magnetic field outside the magnetic path, and includes both a type that leaks the magnetic field and a type that does not leak the magnetic field. It may be a composite objective lens.
- the condenser lenses 103, 104 and the objective lens 105 may be an electrostatic lens for the above-mentioned purpose, or may be an objective lens in which a magnetic field lens and an electrostatic lens are used in combination, such as a booster optical system and a retarding optical system.
- the type of lens does not matter for the purpose of focusing the charged particle beam on the sample 114.
- the detector 116 for detecting the secondary charged particles may be arranged in the sample chamber 115 as shown in FIG. 1, or may be arranged in the column on which the charged particle optical system is mounted. Further, it may be arranged both in the sample chamber 115 and in the column. For the purpose of detecting secondary charged particles, the number and location of the particles are not limited. Further, although FIG. 1 shows a charged particle beam device including one charged particle beam column, a composite charged particle beam device including a plurality of charged particle beam columns may also be used.
- FIG. 2A shows a state in which a first charged particle beam diaphragm 118 and a second charged particle beam diaphragm 119 are formed on one plate 180, and the plate 180 is held by the diaphragm holder 120.
- FIG. 2A shows a top view and a cross-sectional view taken along the line AA in the top view.
- the plate 180 is fixed to the aperture holder 120 by the holding plate 182.
- the first charged particle beam diaphragm 118 and the second charged particle beam diaphragm 119 may be formed on different plates. Further, the central portion of the ring of the first charged particle beam diaphragm 118 is supported by three support portions, but the number of support portions does not matter. Further, as long as the first charged particle beam diaphragm 118 and the second charged particle beam diaphragm 119 each have one or more, the number thereof does not matter.
- the plate 180 is covered with a chemically inactive conductor such as Pt in order to suppress charging due to irradiation with charged particle beams.
- the diaphragm holder 120 is connected to the diaphragm tilting mechanism 121 via the support member 183.
- the direction parallel to the optical axis is defined as the Z direction
- the plane perpendicular to the Z direction is defined as the XY plane.
- the XY plane is a plane stretched by an X-axis passing through the center of the first charged particle beam drawing 118, the center of the second charged particle beam drawing 119, and a Y-axis perpendicular to the X-axis.
- the diaphragm tilting mechanism 121 tilts the plate 180 about the support member 183.
- first charged particle beam diaphragm 118 and the second charged particle beam diaphragm 119 are inclined about the X axis.
- the configuration of FIG. 2B has one tilt axis (X-axis), whereas the configuration of FIG. 2C has two tilt axes (X-axis and Y-axis). This enables more precise tilt control.
- the first drawing tilt mechanism 121a tilts the first charged particle beam drawing 118 and the second charged particle beam drawing 119 about the X axis
- the second drawing tilting mechanism 121b has the Y axis as the axis.
- the 1st charged particle beam drawing 118 and the 2nd charged particle beam drawing 119 are tilted.
- the aperture tilt mechanism 121 (121a) is connected to the aperture position adjusting mechanism 122 as shown in FIG. 2C.
- the aperture position adjusting mechanism 122 allows the plate 180 to be translated.
- the directions in which translation is possible are preferably two or more directions (in this example, the X-axis direction and the Y-axis direction).
- the diaphragm tilting mechanism 121 and the diaphragm position adjusting mechanism 122 may be driven manually or may be electrically driven with a stepping motor or a piezo element.
- the adjustment method of the charged particle beam diaphragm having a ring-shaped slit will be described.
- the adjustment necessary for acquiring the charged particle beam image including the optical axis adjustment of the charged particle beam.
- a circular-hole-shaped aperture diaphragm is a general shape of a charged particle beam diaphragm, this adjustment is an operation normally performed by a user with a general charged particle beam device.
- the second charged particle beam diaphragm 119 having a circular hole-shaped opening is changed to the first charged particle beam diaphragm 118 having a ring-shaped slit.
- the first charged particle beam diaphragm 118 is arranged at the position where the second charged particle beam diaphragm 119 was arranged.
- the resolution is evaluated between the image acquired by arranging the first charged particle beam aperture 118 and the image acquired by arranging the second charged particle beam aperture 119, and the first charged particle beam aperture is evaluated. Adjust the tilt of 118. The specific adjustment procedure will be described below. In these adjustment procedures, each controller of the charged particle optical system is controlled by the integrated computer 170.
- the second charged particle beam diaphragm 119 having a circular hole-shaped opening is moved to the vicinity of the optical axis of the charged particle beam (step S31).
- the charged particle beam is scanned on the sample by the third deflector group 142 while periodically changing the excitation of the objective lens 105 (step S32). At that time, if the optical axis does not pass through the center of the objective lens 105, the center of the displayed image moves in synchronization with the excitation fluctuation of the objective lens 105.
- the path of the charged particle beam is adjusted so that the movement of the image is stopped by using the second deflector group 141 arranged on the sample side of the charged particle beam diaphragm (step S33).
- the state in which the movement of the image is stopped corresponds to the charged particle beam passing through the center of the objective lens 105.
- the above procedure is an optical axis adjustment performed in a general charged particle beam device. After the optical axis adjustment is completed, the charged particle beam is scanned on the sample by the third deflector group 142 to acquire an image (step S34).
- the first charged particle beam diaphragm 118 having the annular slit is moved to the vicinity of the optical axis (step S35). Similar to step S32, the charged particle beam is scanned on the sample while periodically changing the excitation of the objective lens 105 (step S36). The position of the first charged particle beam diaphragm 118 is adjusted by using the diaphragm position adjusting mechanism 122 so that the movement of the image is stopped (step S37). This corresponds to the fact that the optical axis of the charged particle beam in the state where the second charged particle beam diaphragm 119 is inserted is adjusted to pass through the center of the first charged particle beam diaphragm 118. After that, an image is acquired in the same manner as in step S34 (step S38).
- step S32 and S36 described above instead of periodically changing the excitation of the objective lens 105, the acceleration electrode controller 152 periodically changes the acceleration voltage of the charged particle beam to perform the same adjustment. It can also be done (steps S32a and S36a).
- step S39 the resolutions of the images acquired in step S34 and step S38 are compared.
- the resolution of the image acquired in step S38 is equal to or higher than the resolution of the image acquired in step S34, the adjustment is terminated.
- the tilt angle of the first charged particle beam diaphragm 118 is adjusted by using the diaphragm tilt mechanism 121 while scanning on the sample with the third deflector group (step S40). ).
- the steps following step S36 (S36a) are repeatedly executed as necessary, and when the resolution of the image acquired in step S38 is equal to or higher than the resolution of the image acquired in step S34, the adjustment is terminated.
- the improvement in resolution is due to the fact that the angle of incidence of the charged particle beam on the first charged particle beam aperture 118 is adjusted, and the verticality between the optical axis of the charged particle beam and the first charged particle beam aperture 118 is improved.
- the inclination of the charged particle beam aperture may be adjusted once every time the charged particle beam device is installed and then the charged particle beam source 101 is replaced. This is because when exchanging a charged particle beam source, the emission directions of the charged particle beam source and the charged particle beam before the exchange cannot be completely matched.
- the optical axis of the charged particle beam can be incident perpendicular to the center of the diaphragm.
- the density of the charged particle beam passing through the annular slit becomes uniform, and the charged particle beam divided by the slit in the drawing is focused at the same place on the sample.
- the effect of improving the depth of focus by the diaphragm having the annular slit can be stably obtained.
- FIG. 4 shows an outline of the charged particle beam apparatus according to the second embodiment.
- the configuration common to the charged particle beam apparatus according to the first embodiment is designated by the same reference numerals, and overlapping description will be omitted.
- the first charged particle beam electrode 401 having a ring-shaped slit
- the second charged particle beam electrode 402 having a circular hole-shaped opening
- the first charged particle is held in the electrode holder 405.
- An insulating member 403 for electrically insulating the wire electrode 401 and the second charged particle beam electrode 402, and a charged particle beam drawing 404 having a circular hole-shaped opening are held in the electrode holder 405.
- the first charged particle beam electrode 401 is the first charged particle beam drawing 118 of the first embodiment
- the second charged particle beam electrode 402 and the charged particle beam drawing 404 are the second charged particle beam drawing 119 of the first embodiment.
- the element has the same structure.
- the electrode power supply 410 for applying a voltage to the second charged particle beam electrode 402 and the electrode power supply controller 431 for controlling the electrode power supply 410 are provided.
- the first charged particle beam electrode 401 is electrically connected to the beam tube 112, and a different voltage is applied to the second charged particle beam electrode 402.
- the charged particle beam electrode 402 may be electrically connected to the beam tube 112 and different voltages may be applied to the first charged particle beam electrode 401, or the first charged particle beam electrode 401 and the second charged particle may be applied. Both the wire electrode 402 may be configured so that a voltage different from that of the beam tube 112 can be applied. In this case, a power source for applying a voltage is provided to each of the first charged particle beam electrode 401 and the second charged particle beam electrode 402.
- FIG. 5A shows a top view of the electrode holder
- FIG. 5B shows a cross-sectional view taken along the line BB of FIG. 5A.
- the electrode unit 501a in which the first and second charged particle beam electrodes 401 and 402 are housed and the electrode unit 501b in which the charged particle beam drawing 404 is housed are held in the electrode holder 405.
- the number of electrode units held by the electrode holder 405 may be two or more.
- FIG. 5B shows a state in which the electrode unit 501b is fixed to the electrode holder 405.
- the electrode unit 501 is fixed to the electrode holder 405 by a holding screw 516 via a holding plate 406, and can be attached to and detached from the electrode holder 405 in unit units.
- the unit-by-unit replaceable configuration facilitates replacement when the charged particle beam electrode or charged particle beam aperture is contaminated, or when the user desires a combination of multiple charged particle beam electrodes. ..
- the configuration of the electrode unit will be explained.
- the electrode unit 501a in which the charged particle beam electrode is housed is housed in a cylindrical insulating case 515 having an outer diameter corresponding to a hole for holding the electrode unit of the electrode holder 405.
- the charged particle beam electrode 401, the middle spacer 512, the insulating member 403, the upper spacer 511, the second charged particle beam electrode 402, and the electrode retainer 514 are arranged in this order. It is desirable that the insulating member 403 is arranged so as not to be seen from the path of the charged particle beam in order to prevent charging. Therefore, as shown in FIG.
- the insulating member 403 is arranged between the upper spacer 511 having a small inner diameter and the middle spacer 512 having a large inner diameter, and the charged particle beam passes through the opening of the upper spacer 511.
- the side surface of the insulating member 403 is covered by the inner wall of the upper spacer 511, and the insulating member 403 is hidden from the path of the charged particle beam.
- the spacers 511 to 513, the electrodes 401, 402, and the electrode retainer 514 are conductors, and the first charged particle beam electrode 401 is electrically connected to the electrode holder 405 via the lower spacer 513, and the electrode holder 405 is a beam.
- the first charged particle beam electrode 401 has the same potential (ground potential) as the beam tube 112.
- the second charged particle beam electrode 402 is connected to the electrode power supply 410 via the electrode retainer 514, and the voltage generated by the electrode power supply 410 is applied.
- the electrode unit 501b in which the charged particle beam diaphragm 404 is housed has the same configuration as the electrode unit 501a. That is, in the insulating case 515, the lower spacer 513, the charged particle beam diaphragm 404, the middle spacer 512, the insulating member 403, the upper spacer 511, and the electrode retainer 514 are arranged in this order from the bottom.
- the electrode holder 405 is connected to the electrode tilting mechanism 421 via the support member 521.
- the direction parallel to the optical axis is defined as the Z direction
- the plane perpendicular to the Z direction is defined as the XY plane.
- the XY plane is a plane stretched by an X-axis passing through the center of the first charged particle beam electrode 401 and the center of the charged particle beam drawing 404, and a Y-axis perpendicular to the X-axis.
- the electrode tilting mechanism 421 tilts the electrode holder 405 around the support member 521. That is, the electrode unit 501a and the electrode unit 501b are inclined about the X axis.
- FIG. 5C has one tilt axis (X-axis), whereas the configuration of FIG. 5D has two tilt axes (X-axis and Y-axis). This enables more precise tilt control.
- the first electrode tilting mechanism 421a tilts the electrode units 501a and 501b about the X-axis, and the second electrode tilting mechanism 421b tilts the electrode units 501a and 501b about the Y-axis.
- the electrode tilting mechanism 421 (421a) is connected to the electrode position adjusting mechanism 422 as shown in FIG. 5D.
- the electrode position adjusting mechanism 422 allows the electrode holder 405 to be translated.
- the parallel movable direction is preferably two or more directions (in this example, the X-axis direction and the Y-axis direction).
- the electrode tilting mechanism 421 and the electrode position adjusting mechanism 422 may be driven manually or may be electrically driven with a stepping motor or a piezo element.
- the electrode tilting mechanism 421 is controlled by the electrode tilting mechanism controller 432, and the electrode position adjusting mechanism 422 is controlled by the electrode position adjusting mechanism controller 433.
- step S31 the charged particle beam diaphragm 404 is moved near the optical axis
- step S35 the charged particle beam electrodes 401 and 402 are moved near the optical axis. Further, the subsequent adjustment is performed in a state where a predetermined voltage is applied between the first charged particle beam electrode 401 and the second charged particle beam electrode 402 in order to correct the aberration of the charged particle beam.
- the images to be compared in step S39 are the image before aberration correction acquired in step S34 and the image after aberration correction by the charged particle beam electrode acquired in step S38. Therefore, in step S39, the inclination of the electrode holder is adjusted depending on whether or not the resolution of the image acquired before the aberration correction is equal to or greater than the expected value of the resolution obtained by adding the improvement expected by the aberration correction. This is performed to determine whether or not to adjust the angle of incidence of the charged particle beam on the first charged particle beam electrode 401.
- the inclination of the charged particle beam electrode may be adjusted once every time the charged particle beam device is installed and then the charged particle beam source 101 is replaced. This is because when exchanging a charged particle beam source, the emission directions of the charged particle beam source and the charged particle beam before the exchange cannot be completely matched.
- the optical axis of the charged particle beam can be incident perpendicular to the center of the electrode.
- the density of the charged particle beam passing through the annular slit becomes uniform, and the correction action given to the charged particle beam divided by the slit at the electrode becomes uniform.
- the spherical aberration correction effect of the electrode having the annular slit can be stably obtained.
- FIG. 6 shows an outline of the charged particle beam apparatus according to the third embodiment.
- the configuration common to the charged particle beam apparatus according to the second embodiment is shown with the same reference numerals, and duplicated description will be omitted.
- the first is arranged on the charged particle beam source 101 side of the charged particle beam electrode and changes the angle of the charged particle beam incident on the charged particle beam electrode.
- the correction deflector group 601 of the above and the second correction deflector group 602 for changing the angle of the charged particle beam passing through the charged particle beam electrode are provided.
- the first and second correction deflector groups 601, 602 are controlled by the first and second correction deflector group controllers 611 and 612, respectively.
- the first correction deflector group 601 and the second correction deflector group 602 are adjusted so that the amount of deflection is the same and the charged particle beam is deflected in opposite directions.
- the first and second correction deflector groups 601, 602 may use an electric field or a magnetic field.
- Steps S71 to S74 are carried out in the same manner as in steps S31 to S34 in Example 1 or 2 shown in FIG.
- the first and second correction deflector group controllers 611, 612 using the first and second correction deflector group controllers 611, 612, the amount of deflection of the charged particle beam by the first correction deflector group 601 and the second correction deflector group 602 and The direction of deflection is adjusted (step S75).
- the charged particle beam is scanned by the first deflector group 140.
- a circular charged particle beam image is displayed on the display 172.
- the charged particle beam is deflected by using the upper stage deflector 601a of the first correction deflector group 601.
- the position of the circular charged particle beam image moves, so the charged particle beam is deflected using the lower deflector 601b so as to return to the position before deflection.
- the upper and lower stage deflection ratios of the first correction deflector group 601 are determined.
- the charged particle beam is scanned on the sample using the third deflector group 142 while periodically changing the excitation of the objective lens 105.
- the optical axis does not pass through the center of the objective lens, the center of the image displayed on the display 172 moves in synchronization with the excitation fluctuation of the objective lens 105. Therefore, the path of the charged particle beam is adjusted so that the movement of the image is stopped by using the second correction deflector group 602.
- the upper and lower stage deflection ratios of the second correction deflector group 602 are set to be equal to the upper and lower stage deflection ratios of the first correction deflector group 601.
- the first correction deflector group 601 and the second correction deflector group 602 In the output ratio of the first correction deflector group 601 and the second correction deflector group 602 when the movement of the image is stopped, the first correction deflector group 601 and the second correction deflector group 601 It is adjusted so that the amount of deflection is the same as that of 602 and the charged particle beams are deflected in opposite directions. Instead of periodically changing the excitation of the objective lens 105, the acceleration voltage of the charged particle beam may be changed periodically.
- FIG. 6 shows an example in which the correction deflector group is each composed of upper and lower two-stage deflectors, each may be composed of one-stage deflector.
- the adjustment method in this case will be described.
- the charged particle beam is scanned by the first deflector group 140.
- a circular charged particle beam image is displayed on the display 172.
- the charged particle beam is deflected by using the first correction deflector group 601.
- the position of the charged particle beam aperture 404 is adjusted by the electrode position adjusting mechanism 422 so that the charged particle beam image becomes the brightest.
- the charged particle beam is scanned on the sample using the third deflector group 142 while periodically changing the excitation of the objective lens 105.
- the optical axis does not pass through the center of the objective lens, the center of the image displayed on the display 172 moves in synchronization with the excitation fluctuation of the objective lens 105. Therefore, the path of the charged particle beam is adjusted so that the movement of the image is stopped by using the second correction deflector group 602.
- the first correction deflector group 601 and the second correction deflector group 602 In the output ratio of the first correction deflector group 601 and the second correction deflector group 602 when the movement of the image is stopped, the first correction deflector group 601 and the second correction deflector group 601 It is adjusted so that the amount of deflection is the same as that of 602 and the charged particle beams are deflected in opposite directions. Instead of periodically changing the excitation of the objective lens 105, the acceleration voltage of the charged particle beam may be changed periodically.
- Steps S76 to S79 are carried out in the same manner as steps S35 to S38 in Example 2.
- step S80 when the resolution of the image acquired in step S79 is less than the expected value of the resolution obtained by adding the improvement expected by the aberration correction to the resolution of the image acquired in step S74, the first and first steps are taken.
- the angle of incidence of the charged particle beam on the first charged particle beam electrode 401 is adjusted by using the correction deflector groups 601, 602 of 2 (step S81) so that the image resolution is improved.
- the output ratios of the first correction deflector group 601 and the second correction deflector group 602 maintain the output ratio adjusted in step S75. As a result, even if the inclination of the charged particle beam is changed, the charged particle beam passes through the center of the objective lens.
- step S77 (S77a) are repeatedly executed as necessary, and when the resolution of the image acquired in step S79 is equal to or higher than the expected value of the image resolution, the adjustment is terminated.
- the improvement in resolution is due to the improvement in the verticality between the optical axis of the charged particle beam and the first charged particle beam electrode 401.
- the optical axis of the charged particle beam can be incident perpendicular to the center of the electrode by adjusting the angle of incidence of the charged particle beam on the electrode having the annular slit.
- the density of the charged particle beam passing through the annular slit becomes uniform, and the correction action given to the charged particle beam divided by the slit at the electrode becomes uniform.
- the spherical aberration correction effect of the electrode having the annular slit can be stably obtained.
- the angle of incidence of the charged particle beam on the charged particle beam electrode may be adjusted once when the charged particle beam device is installed and then every time the charged particle beam source 101 is replaced. This is because when exchanging a charged particle beam source, the emission directions of the charged particle beam source and the charged particle beam before the exchange cannot be completely matched.
- the first correction deflector group 601 and the first in the third embodiment It is also possible to adjust the angle of incidence of the charged particle beam on the first charged particle beam aperture 118 by using the correction deflector group 602 of 2. In this case, as in the first embodiment, the effect of improving the depth of focus by the diaphragm having the annular slit can be stably obtained.
- 101 Charged particle source
- 102 Acceleration electrode
- 103 First condenser lens
- 104 Second condenser lens
- 105 Objective lens
- 112 Beam tube
- 114 Sample
- 115 Sample chamber
- 116 Detection Vessel
- 118 1st charged particle beam aperture
- 119 2nd charged particle beam aperture
- 120 Aperture holder
- 121 Aperture tilt mechanism
- 122 Aperture position adjustment mechanism
- 140 1st deflector group
- 141 Second deflector group
- 142 Third deflector group
- 151 Charged particle source controller
- 152 Acceleration electrode controller
- 153 First condenser lens controller
- 154 Second condenser lens Controller
- 155 Objective lens controller
- 156 Aperture tilt mechanism controller
- 157 Aperture position adjustment mechanism controller
- 161 First deflector group controller
- 162 Second deflector group controller
- 163 Third deflector group controller
- 168 Detector controller
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Electron Sources, Ion Sources (AREA)
- Electron Beam Exposure (AREA)
Abstract
Description
Claims (16)
- 荷電粒子線を発生させる荷電粒子線源と、
円環形状のスリットを有する第1の荷電粒子線絞りと、
前記第1の荷電粒子線絞りを保持する絞りホルダーと、
前記絞りホルダーを第1軸と前記第1軸と直交する第2軸で張られる平面上で移動させる絞り位置調整機構と、
前記荷電粒子線の前記第1の荷電粒子線絞りへの入射角度を調整する絞り傾斜機構とを有する荷電粒子線装置。 - 請求項1において、
前記絞り傾斜機構は、前記第1軸を軸として前記絞りホルダーに保持された前記第1の荷電粒子線絞りを傾斜させる第1の絞り傾斜機構と、前記第2軸を軸として前記絞りホルダーに保持された前記第1の荷電粒子線絞りを傾斜させる第2の絞り傾斜機構とを含み、
前記第1の荷電粒子線絞りの中心は前記第1軸上に位置する荷電粒子線装置。 - 請求項2において、
前記絞りホルダーは、円孔形状の開孔を有する第2の荷電粒子線絞りを保持し、
前記第1の荷電粒子線絞りの中心及び前記第2の荷電粒子線絞りの中心は、前記第1軸上に位置する荷電粒子線装置。 - 請求項3において、
前記荷電粒子線を試料に集束する対物レンズと、
前記荷電粒子線が前記試料に照射されることにより放出された二次荷電粒子を検出する検出器と、
前記検出器で検出された二次荷電粒子に基づき画像を形成するコンピュータとを有し、
前記絞り傾斜機構は、前記荷電粒子線に前記第1の荷電粒子線絞りを通過させて取得した第1の画像の分解能が、前記荷電粒子線に前記第2の荷電粒子線絞りを通過させて取得した第2の画像の分解能と同等以上となるように調整される荷電粒子線装置。 - 荷電粒子線を発生させる荷電粒子線源と、
円環形状のスリットを有する第1の荷電粒子線電極と、
前記第1の荷電粒子線電極と対向して配置され、円孔形状の開孔を有する第2の荷電粒子線電極と、
前記第1の荷電粒子線電極及び前記第2の荷電粒子線電極を保持する電極ホルダーと、
前記第1の荷電粒子線電極と前記第2の荷電粒子線電極との間に電圧を印加する電極電源と、
前記電極ホルダーを第1軸と前記第1軸と直交する第2軸で張られる平面上で移動させる電極位置調整機構と、
前記荷電粒子線の前記第1の荷電粒子線電極への入射角度を調整する電極傾斜機構とを有する荷電粒子線装置。 - 請求項5において、
前記電極傾斜機構は、前記第1軸を軸として前記電極ホルダーに保持された前記第1の荷電粒子線電極及び前記第2の荷電粒子線電極を傾斜させる第1の電極傾斜機構と、前記第2軸を軸として前記電極ホルダーに保持された前記第1の荷電粒子線電極及び前記第2の荷電粒子線電極を傾斜させる第2の絞り傾斜機構とを含み、
前記第1の荷電粒子線電極の中心は前記第1軸上に位置する荷電粒子線装置。 - 請求項6において、
前記電極ホルダーは、円孔形状の開孔を有する荷電粒子線絞りを保持し、
前記第1の荷電粒子線電極の中心及び前記荷電粒子線絞りの中心は、前記第1軸上に位置する荷電粒子線装置。 - 請求項7において、
前記荷電粒子線を試料に集束する対物レンズと、
前記荷電粒子線が前記試料に照射されることにより放出された二次荷電粒子を検出する検出器と、
前記検出器で検出された二次荷電粒子に基づき画像を形成するコンピュータとを有し、
前記電極傾斜機構は、前記荷電粒子線に前記第1の荷電粒子線電極と前記第2の荷電粒子線電極との間に前記電極電源から所定の電圧を印加した状態で前記第1の荷電粒子線電極及び前記第2の荷電粒子線電極を通過させて取得した第1の画像の分解能が、前記荷電粒子線に前記荷電粒子線絞りを通過させて取得した第2の画像の分解能に基づく期待値と同等以上となるように調整される荷電粒子線装置。 - 荷電粒子線を発生させる荷電粒子線源と、
円環形状のスリットを有する第1の荷電粒子線絞りと、
前記第1の荷電粒子線絞りを保持する絞りホルダーと、
前記絞りホルダーを第1軸と前記第1軸と直交する第2軸で張られる平面上で移動させる絞り位置調整機構と、
前記第1の荷電粒子線絞りに入射する前記荷電粒子線を偏向させる第1の偏向器群と、
前記第1の偏向器群により前記荷電粒子線を偏向させることにより、前記第1の荷電粒子線絞りへの入射角度を調整する荷電粒子線装置。 - 請求項9の荷電粒子線装置において、
前記第1の荷電粒子線絞りを通過した前記荷電粒子線を偏向させる第2の偏向器群と、
前記第1の偏向器群による前記荷電粒子線の偏向量と前記第2の偏向器群による前記荷電粒子線の偏向量とは等しく、かつ互いの偏向方向が逆方向とされる荷電粒子線装置。 - 請求項10において、
前記絞りホルダーは、円孔形状の開孔を有する第2の荷電粒子線絞りを保持し、
前記第1の荷電粒子線絞りの中心及び前記第2の荷電粒子線絞りの中心は、前記第1軸上に位置する荷電粒子線装置。 - 請求項11において、
前記荷電粒子線を試料に集束する対物レンズと、
前記荷電粒子線が前記試料に照射されることにより放出された二次荷電粒子を検出する検出器と、
前記検出器で検出された二次荷電粒子に基づき画像を形成するコンピュータとを有し、
前記第1の偏向器群による前記荷電粒子線の偏向量及び前記第2の偏向器群による前記荷電粒子線の偏向量は、前記荷電粒子線に前記第1の荷電粒子線絞りを通過させて取得した第1の画像の分解能が、前記荷電粒子線に前記第2の荷電粒子線絞りを通過させて取得した第2の画像の分解能と同等以上となるように調整される荷電粒子線装置。 - 荷電粒子線を発生させる荷電粒子線源と、
円環形状のスリットを有する第1の荷電粒子線電極と、
前記第1の荷電粒子線電極と対向して配置され、円孔形状の開孔を有する第2の荷電粒子線電極と、
前記第1の荷電粒子線電極及び前記第2の荷電粒子線電極を保持する電極ホルダーと、
前記第1の荷電粒子線電極と前記第2の荷電粒子線電極との間に電圧を印加する電極電源と、
前記電極ホルダーを第1軸と前記第1軸と直交する第2軸で張られる平面上で移動させる電極位置調整機構と、
前記第1の荷電粒子線電極に入射する前記荷電粒子線を偏向させる第1の偏向器群と、
前記第1の偏向器群により前記荷電粒子線を偏向させることにより、前記第1の荷電粒子線電極への入射角度を調整する荷電粒子線装置。 - 請求項13の荷電粒子線装置において、
前記第1の荷電粒子線電極及び前記第2の荷電粒子線電極を通過した前記荷電粒子線を偏向させる第2の偏向器群と、
前記第1の偏向器群による前記荷電粒子線の偏向量と前記第2の偏向器群による前記荷電粒子線の偏向量とは等しく、かつ互いの偏向方向が逆方向とされる荷電粒子線装置。 - 請求項14において、
前記電極ホルダーは、円孔形状の開孔を有する荷電粒子線絞りを保持し、
前記第1の荷電粒子線電極の中心及び前記荷電粒子線絞りの中心は、前記第1軸上に位置する荷電粒子線装置。 - 請求項15において、
前記荷電粒子線を試料に集束する対物レンズと、
前記荷電粒子線が前記試料に照射されることにより放出された二次荷電粒子を検出する検出器と、
前記検出器で検出された二次荷電粒子に基づき画像を形成するコンピュータとを有し、
前記第1の偏向器群による前記荷電粒子線の偏向量及び前記第2の偏向器群による前記荷電粒子線の偏向量は、前記荷電粒子線に前記第1の荷電粒子線電極と前記第2の荷電粒子線電極との間に前記電極電源から所定の電圧を印加した状態で前記第1の荷電粒子線電極及び前記第2の荷電粒子線電極を通過させて取得した第1の画像の分解能が、前記荷電粒子線に前記荷電粒子線絞りを通過させて取得した第2の画像の分解能に基づく期待値と同等以上となるように調整される荷電粒子線装置。
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JPS4731057U (ja) * | 1971-04-20 | 1972-12-08 | ||
JPH0218845A (ja) * | 1988-07-07 | 1990-01-23 | Jeol Ltd | 電子顕微鏡の絞り位置制御装置 |
JP2002025488A (ja) * | 2000-07-13 | 2002-01-25 | Sumitomo Heavy Ind Ltd | ビーム成形スリット |
JP2011014299A (ja) * | 2009-06-30 | 2011-01-20 | Hitachi High-Technologies Corp | 走査電子顕微鏡 |
WO2019186936A1 (ja) * | 2018-03-29 | 2019-10-03 | 株式会社日立ハイテクノロジーズ | 荷電粒子線装置 |
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JP6351196B2 (ja) * | 2015-04-27 | 2018-07-04 | 国立大学法人名古屋大学 | 荷電粒子ビーム用電磁レンズの球面収差補正装置 |
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JPS4731057U (ja) * | 1971-04-20 | 1972-12-08 | ||
JPH0218845A (ja) * | 1988-07-07 | 1990-01-23 | Jeol Ltd | 電子顕微鏡の絞り位置制御装置 |
JP2002025488A (ja) * | 2000-07-13 | 2002-01-25 | Sumitomo Heavy Ind Ltd | ビーム成形スリット |
JP2011014299A (ja) * | 2009-06-30 | 2011-01-20 | Hitachi High-Technologies Corp | 走査電子顕微鏡 |
WO2019186936A1 (ja) * | 2018-03-29 | 2019-10-03 | 株式会社日立ハイテクノロジーズ | 荷電粒子線装置 |
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