WO2014199709A1 - 荷電粒子線装置及び荷電粒子線装置の調整方法 - Google Patents
荷電粒子線装置及び荷電粒子線装置の調整方法 Download PDFInfo
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- WO2014199709A1 WO2014199709A1 PCT/JP2014/060037 JP2014060037W WO2014199709A1 WO 2014199709 A1 WO2014199709 A1 WO 2014199709A1 JP 2014060037 W JP2014060037 W JP 2014060037W WO 2014199709 A1 WO2014199709 A1 WO 2014199709A1
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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
- H01J37/261—Details
- H01J37/265—Controlling the tube; circuit arrangements adapted to a particular application not otherwise provided, e.g. bright-field-dark-field illumination
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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
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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
- H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
- H01J37/28—Electron or ion microscopes; Electron or ion diffraction tubes with scanning beams
Definitions
- the present invention relates to a charged particle beam apparatus and a method for adjusting the charged particle beam apparatus, which are suitable for correcting a deviation of the optical axis of a charged particle optical system and stably obtaining a high resolution image.
- a charged particle beam apparatus typified by a scanning electron microscope scans a desired region (field of view) on a sample with a charged particle beam, and records a charged particle signal emitted from the scanning region corresponding to a scanning position. Thus, the observation place is imaged.
- a scanning electron microscope has many parameters that can be freely set, such as an acceleration voltage, a probe current, a distance between an objective lens and a sample, and a signal detector, and this causes a complicated impression.
- Patent Document 1 and Patent Document 2 as prior art documents related to the present invention. Both documents also relate to automatic adjustment of charged particle beam devices.
- Patent Document 2 relates to automatic adjustment that adjusts the optical axis to the center of the objective aperture in addition to the contents of Patent Document 1.
- the inventor of the present application has earnestly studied to correct an optical axis shift of a highly versatile charged particle beam apparatus by an operator having little experience, and as a result, the following knowledge has been obtained.
- Patent Documents 1 and 2 In an inspection apparatus or a measurement apparatus that targets only a specific sample, if the techniques of Patent Documents 1 and 2 are used, the possibility of failure in automatic adjustment is extremely small. However, it is possible to observe various observation samples, and in general-purpose charged particle beam equipment that covers a wide range of target observation samples, the adjustment conditions are complicated, so automatic adjustment may fail due to the observation samples. There is sex.
- Manual adjustment is required if automatic adjustment fails. If automatic adjustment fails and manual adjustment is eventually required, it is considered that there will be many operators who perform manual adjustment without using the automatic adjustment function from the beginning.
- the operator may continue to observe without noticing the lack of adjustment and may be dissatisfied with the performance of the device.
- the scanning electron microscope is becoming a special device that is used only by a limited number of people, and since the base of the operator is expanding, it is expected that the operator's expectation for technical acquisition will be difficult.
- an experienced person manually adjusts the charged particle beam irradiation conditions and registers the conditions.
- a shallow operator may call up and use a registered value.
- the objective aperture that determines the irradiation current to the sample is generally movable, and the position of the objective aperture is changed on a daily basis by the operator. Therefore, it is difficult to pre-register the position of the objective aperture. For this reason, it is difficult to determine whether the objective focus position when the expert manually adjusts and the current objective focus position are the same, and if the position of the objective focus is not the same as the adjusted position, the registered condition Adjustment values are meaningless and require readjustment.
- the Z coordinate of the sample stage can be freely set, and even when the Z coordinate when the expert manually adjusts and the current Z coordinate are different, readjustment is necessary. .
- An object of the present invention is to provide a highly versatile charged particle beam apparatus having parameters related to irradiation conditions of a primary charged particle beam that is difficult to pre-register for a wide range of observation samples, even for an operator with little experience. It relates to enabling easy and accurate operation to obtain a high resolution image.
- the charged particle beam apparatus of the present invention includes, for example, a charged particle source, a focusing lens for focusing a primary charged particle beam emitted from the charged particle source, and an objective for focusing the primary charged particle beam on a sample.
- An image display unit that performs image processing on the secondary signal detected by the detector and displays the processed image, a storage unit that stores a plurality of irradiation conditions of the primary charged particle beam, and an operation control unit are provided.
- the operation control unit selects the irradiation condition, determines whether or not the arranged objective is suitable for the selected irradiation condition, and if the objective is not suitable, the image display indicates that the objective is not suitable. If the objective squeezing is suitable for the selected irradiation condition, perform pre-adjustment to adjust the primary charged particle beam so that it matches the selected irradiation condition, and the result of the execution will be displayed.
- the charged particle beam apparatus adjustment method of the present invention stores, for example, a plurality of irradiation conditions for primary charged particle beam irradiation in the charged particle beam apparatus in the storage unit, and a plurality of irradiation conditions stored in the storage unit. Is selected, and it is determined whether or not the arranged objective is suitable for the selected irradiation condition. If the objective is not suitable, the fact that it is not suitable is displayed on the image display unit, and the objective Is adapted to the selected irradiation condition, pre-adjustment is performed to adjust the primary charged particle beam so as to match the selected irradiation condition, and the result of the execution is stored in advance as the parameter for the irradiation condition.
- a plurality of irradiation conditions for primary charged particle beam irradiation in the charged particle beam apparatus in the storage unit
- a plurality of irradiation conditions stored in the storage unit Is selected, and it is determined whether or not the arranged objective is suitable for the selected
- a charged particle beam apparatus capable of acquiring a high-resolution image and a method for adjusting the charged particle beam apparatus can be realized.
- a charged particle source a focusing lens for focusing a primary charged particle beam emitted from the charged particle source, an objective lens for focusing the primary charged particle beam on a sample, and a charged particle source from the objective lens
- a movable objective lens having a plurality of objective lenses arranged on the side, a detector for detecting a secondary signal generated from the sample by irradiation of the primary charged particle beam, and a secondary signal detected by the detector are image-processed.
- An image display unit that displays the processed image, a storage unit that stores a plurality of irradiation conditions of the primary charged particle beam, and whether the irradiation condition is selected, and whether the arranged object aperture matches the selected irradiation condition If the objective is not suitable, the fact that it is not suitable is displayed on the image display unit. If the objective is suitable for the selected irradiation condition, the selected irradiation condition is met. Run the preconditioning for adjusting the primary charged particle beam urchin, an operation control unit to be stored in advance in the storage unit the results of running as according to the irradiation conditions parameter, discloses a charged particle beam device comprising a.
- a plurality of irradiation conditions for primary charged particle beam irradiation of the charged particle beam apparatus are stored in the storage unit, a plurality of irradiation conditions stored in the storage unit are selected, and the arranged object squeeze It is determined whether or not the selected irradiation condition is met. If the objective is not suitable, the fact that it is not suitable is displayed on the image display unit, and if the objective is suitable for the selected irradiation condition, it is selected.
- An adjustment method for a charged particle beam apparatus in which a pre-adjustment for adjusting a primary charged particle beam so as to conform to the irradiation condition is executed, and the execution result is stored in advance in a storage unit as a parameter relating to the irradiation condition.
- the operation control unit causes the image display unit to display and select a plurality of irradiation conditions stored in the storage unit, and among the plurality of object squeezes, the arranged objective squeeze is the image display unit.
- the selected irradiation conditions are met. If the objective does not fit, display that it does not fit on the image display unit, and if the objective is fitted to the selected irradiation conditions.
- the primary charged particle beam is adjusted so as to meet the predetermined adjustment reference irradiation conditions, and the image for adjusting the central axis of the primary charged particle beam is displayed on the image display unit, and the position of the objective focus is adjusted.
- the central axis of the primary charged particle beam is adjusted, the primary charged particle beam is adjusted so as to meet the irradiation condition selected via the image display unit.
- the pre-adjusted irradiation conditions can be obtained using a dedicated sample.
- a sample stage that supports and moves the sample is provided, and the irradiation condition includes the position of the sample on the sample stage, and a plurality of sample stage positions can be set. Further, it is disclosed that the sample is supported and moved by the sample stage, and the irradiation condition includes the position of the sample on the sample stage, and a plurality of sample stage positions can be set.
- the operation control unit determines whether it is necessary to execute the pre-adjustment again.
- the pre-adjustment needs to be executed again, the necessity for executing the pre-adjustment is displayed on the display unit.
- the operation control unit adjusts whether or not the position of the objective aperture needs to be adjusted and the position of the objective aperture is within the allowable range when the objective aperture meets the selected irradiation condition. It is disclosed that it is determined whether or not.
- a sample stage that supports and moves the sample is provided, and the operation control unit determines whether or not the dedicated sample is set on the sample stage. Further, it is disclosed that the sample is supported and moved by the sample stage and it is determined whether or not the dedicated sample is set on the sample stage.
- the operation control unit periodically performs advance adjustment, determines whether or not the charged particle beam apparatus needs to be maintained based on the adjustment value obtained by the executed advance adjustment, and requires maintenance. When it is determined that there is, it is disclosed that the display unit displays that maintenance is necessary.
- a scanning electron microscope Scanning Electron Microscope: SEM
- SEM Sccanning Electron Microscope: SEM
- the present invention can also be applied to a focused ion beam (FocusedocIon Beam) apparatus that irradiates a sample with an ion beam emitted from a liquid metal ion source or a gas ion source.
- FIG. 1 is a schematic configuration diagram showing an example of a scanning electron microscope apparatus to which the present invention is applied.
- the inside of the broken line shows the configuration in the scanning electron microscope column 100, and the primary electron beam 2 emitted from the electron gun 1 is converged by the first focusing lens 3, the second focusing lens 7 and the objective lens 12, and the upper stage. Scanning is performed on the sample 13 by the deflection coil 10 and the lower deflection coil 11. Signal electrons generated from the sample 13 are detected by the detector 14 and supplied to the computer (operation control unit) 41 via the detection signal control circuit 31. Then, a signal recorded corresponding to the scanning position is displayed on the image display device 42.
- the sample 13 is set on the sample stage 15 via a holder (not shown) and can be moved in the Z direction (the optical axis direction of the primary electron beam 2) by the sample stage 15. A plurality of Z stage positions of the sample stage 15 can be set.
- the primary electron beam 2 irradiated on the sample 13 is limited by the movable objective aperture 6.
- the movable objective aperture 6 has a structure in which a plurality of objective apertures (openings) having different sizes can be used by switching them. Each objective mark is assigned a number, and it is possible to determine the number of the objective mark being used by detecting the position of the objective mark with the sensor 25 by the apparatus. In addition, you may distinguish an objective squeeze not by a number but by an alphabet or a name (use).
- the movable objective lens 6 not only switches and uses a plurality of objective lenses, but also has a function of adjusting the position of the objective lens in the horizontal direction (the direction in the plane perpendicular to the optical axis of the primary electron beam). .
- the setting of the electron beam irradiation conditions is not set individually, but is selected from a list of electron beam irradiation conditions combining the individual parameters.
- the individual parameters are the acceleration voltage of the primary electron beam 2, the current of the primary electron beam 2 irradiated on the sample 13, the scanning method of the primary electron beam 2 on the sample 13, and the movable objective 6. It is a squeezing number.
- the Z coordinate of the sample stage 15 is also one of the parameters constituting the electron beam irradiation conditions, and a specific value is set for each electron beam irradiation condition.
- the combination of irradiation conditions can be arbitrarily set by the operator.
- Reference numeral 21 denotes a high voltage control circuit
- 22 denotes a first focusing lens control circuit
- 23 denotes a beam center axis adjustment aligner control circuit
- 24 denotes a beam center axis adjustment deflector control circuit
- 26 denotes a second focusing lens control circuit.
- 27 is an astigmatism control circuit
- 28 is an aligner control circuit
- 29 is a deflector control circuit
- 30 is an objective lens control circuit
- 32 is a sample stage drive control circuit
- 44 is a manual operation panel.
- FIG. 2 is a diagram showing an example of a user interface (UI) for selecting irradiation conditions.
- the screen shown in FIG. 2 is displayed on the image display device 42.
- the operator selects one of the irradiation conditions 1 to 5 and presses the set button 42a to set the irradiation conditions.
- FIG. 2 shows a state where the irradiation condition 2 is selected.
- the cancel button 42b When the cancel button 42b is pressed, the current irradiation condition is held. For the irradiation conditions listed on the image display device 42, necessary adjustments are automatically executed in advance, and adjustment values are registered in the storage device 43. When the irradiation conditions shown in FIG. 2 are set, by pressing the set button 42a, the adjustment value pre-registered in the storage device 43 is called and the value is set.
- Beam center axis adjustment aligner 4 is used to adjust the center of the movable objective aperture 6 so that the primary electron beam 2 passes.
- the beam center axis adjusting deflector 5 scans the primary electron beam 2 on the movable objective aperture 6 to obtain a cross-sectional image of the primary electron beam 2 on the movable objective aperture 6.
- FIG. 4 is a diagram showing an example of a beam center axis adjustment image.
- 4A is an example of an image before adjustment
- FIG. 4B is an example of an image after adjustment.
- the image shown in FIG. 4 is generated by the secondary signal generated when the primary electron beam 2 that has passed through the movable objective aperture 6 hits the sample 13 and is displayed on the screen of the image display device 42.
- the center (scanning center) of the entire image for adjusting the beam center axis is the center of the primary electron beam 2, and the objective lens 6 exists at a white circular position.
- Adjustment 2 Adjustment of optical axis deviation with respect to objective lens The excitation current of the objective lens 12 is periodically changed, and the primary electron beam 2 is adjusted using the aligner 9 so as to minimize the movement of the image at this time.
- Adjustment 4 Image movement correction during astigmatism correction
- the aligner 9 adjusts so that the visual field moved in conjunction with the operation of the astigmatism corrector 8 can be canceled.
- Adjustments 5 and 6 are items that can be easily adjusted even by beginners, and thus are not registered, but may be registered.
- FIG. 3 is a diagram illustrating an example of a UI for starting advance automatic adjustment.
- the screen shown in FIG. 3 is displayed on the image display device 42.
- advance adjustment is automatically executed for all the irradiation conditions 1 to 5 shown in FIG.
- FIG. 5 is a diagram showing an example of an operation flowchart for pre-adjustment.
- the operator's work and the operation of the scanning electron microscope apparatus (command operation of the computer 41) are shown separately on the right and left sides.
- step 102 the aperture number of the movable objective aperture 6 that is currently used corresponds to the irradiation condition to be adjusted. It is determined whether it is appropriate.
- step 102 When it is determined in step 102 that an inappropriate number is selected, an instruction to change to a recommended number is displayed on the image display device 42 as shown in FIG. 6 (step 103). The operator changes the number of the objective aperture 6 using the image display device 42 in accordance with the instruction displayed on the image (step 104).
- the scanning electron microscope apparatus sets the apparatus to the irradiation condition that serves as a reference for adjusting the position of the movable objective aperture 6 (step 105). Then, after an image for beam center axis adjustment is displayed on the image display device 42, as shown in FIG. 7, an instruction to adjust the position of the movable objective aperture 6 is displayed (step 106).
- irradiation conditions there may be a plurality of reference irradiation conditions. Moreover, irradiation conditions other than the list of irradiation conditions shown in FIG. 2 may be used.
- the operator adjusts the position of the movable objective aperture 6 so that the circular image (similar to FIG. 4) displayed on the screen is at the center of the screen (step 107). Whether or not the position adjustment of the movable objective aperture 6 is necessary can be automatically determined by the scanning electron microscope apparatus from the position of the white circle in FIG. In the adjustment 1 described above, the primary electron beam 2 is adjusted to the center of the movable objective aperture 6. However, in the adjustment of the aperture position in step 107, the center of the movable objective aperture 6 is adjusted to the center of the primary electron beam 2.
- step 108 the scanning electron microscope apparatus automatically sets one of the irradiation conditions registered (the irradiation condition to be used) automatically.
- the operation of executing the adjustment and registering the result (adjustment value suitable for the irradiation condition) is repeated for a series of irradiation conditions registered in advance (step 109).
- the scanning electron microscope apparatus By providing a reference for adjusting the position of the aperture, it is possible to adjust the aperture 6 again to the same position even if the position of the objective aperture 6 is shifted for some reason after the adjustment is completed. It is also possible for the scanning electron microscope apparatus to automatically determine whether or not the movable objective aperture 6 has been adjusted normally, and if it has not been adjusted, a message to be adjusted again can be issued.
- a dedicated sample is used for automatic adjustment in advance. This is to prevent failure of automatic adjustment.
- a dedicated sample is prepared having a random structure when observed at a target observation magnification.
- “adjustment dedicated sample” is selected from the sample stage setting screen (screen of the image display device 42) shown in FIG.
- the above-described example is an example in which the objective aperture 6 is manually adjusted, but pre-adjustment is possible even when the objective aperture can be electrically controlled.
- FIG. 9 is a diagram illustrating an example of a pre-adjustment operation flowchart in the case where the movable objective aperture 6 can be electrically controlled. Note that the flowchart shown in FIG. 9 is also divided into left and right so that the operator's work and the operation of the scanning electron microscope apparatus can be distinguished, similarly to the flowchart shown in FIG.
- step 200 when the operator presses the automatic adjustment execution button (start button 42c in FIG. 3) (step 200), the apparatus determines whether the number of the movable objective aperture 6 currently used is appropriate (step 201). . If an inappropriate number is selected in step 201, it is automatically changed to a recommended number (step 202).
- the scanning electron microscope apparatus After changing the squeezing number in step 202, the scanning electron microscope apparatus reproduces the squeezing position stored in the storage device 43 in advance (step 203).
- the scanning electron microscope apparatus sets one of the irradiation conditions registered beforehand in the storage device 43 (irradiation conditions to be used), performs automatic adjustment, and registers the result into a series of previously registered irradiation conditions. The process is repeated (step 204).
- FIG. 10 is a diagram showing an example of an operation flowchart during normal use of the scanning electron microscope apparatus. Note that the flowchart shown in FIG. 10 is also divided into left and right so that the operator's work and the operation of the scanning electron microscope apparatus can be distinguished, similarly to the flowcharts shown in FIGS.
- the scanning electron microscope apparatus determines whether or not the number of the current objective aperture 6 is appropriate for the selected irradiation condition. Is determined (step 301). If the objective number is not appropriate, an instruction to change to the recommended objective number is issued as in the screen display shown in FIG. 6 (step 302). The operator changes the objective number according to the instruction (step 303).
- the scanning electron microscope apparatus automatically sets the irradiation condition as a reference for adjusting the position of the movable objective aperture 6 (step 304), and an image for adjusting the beam center axis (see FIG. 4). After displaying the same image as shown, an instruction to adjust the position of the movable objective aperture 6 is issued (step 305). It is also possible for the apparatus to automatically determine whether or not the position adjustment of the movable objective aperture 6 is necessary.
- the operator adjusts the position of the movable objective aperture 6 so that the circular image displayed on the screen is at the center of the screen (step 306).
- the position of the aperture By providing a reference for adjusting the position of the aperture, it is possible to adjust the objective aperture 6 to the same position as at the time of adjustment.
- the operator depresses the objective focusing position adjustment end confirmation button (OK button 42e in FIG. 7) (step 307), the irradiation condition actually used and selected by the operator is set (step 308).
- As the adjustment value a pre-adjusted registered one is called and set (309).
- the apparatus can automatically determine whether or not the movable objective aperture 6 has been adjusted normally, and if it has not been adjusted, a message for instructing the adjustment can be issued again.
- FIG. 11 is a diagram showing an example of an operation flowchart during normal use when the movable objective aperture 6 can be electrically controlled. Note that the flowchart shown in FIG. 11 is also divided into left and right so that the operator's work and the operation of the scanning electron microscope apparatus can be distinguished, similarly to the flowcharts shown in FIG. 5, FIG. 9, and FIG. Yes.
- the scanning electron microscope apparatus determines whether or not the current number of the objective aperture 6 is appropriate (step 401). If the number of the objective aperture 6 is not appropriate, an instruction to change the number to the recommended aperture 6 is issued on the screen shown in FIG. The operator changes the squeezing number according to the instruction (step 402).
- the scanning electron microscope apparatus After changing the squeeze number, the scanning electron microscope apparatus reproduces the position of the objective squeeze 6 stored in the storage device 43 in advance (step 403).
- the irradiation conditions selected by the operator are set (step 404).
- As the adjustment value a pre-adjusted registered value is called and set (step 405).
- FIG. 12 is an example of a screen that displays the recommendation for performing the pre-adjustment (display screen for the necessity of performing pre-adjustment).
- the screen shown in FIG. 12 is displayed on the screen of the image display device 42.
- the adjustment values that are periodically executed and recorded are recorded in the storage device 43 as a log.
- FIG. 13 is an example of a screen that displays that maintenance is required. The screen shown in FIG. 13 is displayed on the screen of the image display device 42.
- the suitability of the objective squeezing is judged and the result is displayed, and the irradiating condition when using a suitable squeezing is used.
- an instruction for adjusting the objective is displayed to the operator, an image for adjusting the objective is displayed, and the adjustment result is registered after the position of the objective is adjusted.
- the scanning electron microscope apparatus is automatically adjusted so that the irradiation conditions are the reference for adjustment, and then an instruction for adjusting the objective lens is given to the operator. Is displayed, and after adjusting the position of the objective aperture, the scanning electron microscope apparatus is automatically adjusted so that the previously selected irradiation condition is satisfied.
- a highly versatile charged particle beam system with a wide range of observation sample types and parameters that are difficult to pre-register, such as the adjustment position of the objective aperture, can be operated easily and accurately even by inexperienced operators.
- a high resolution image can be acquired.
- the above-described example is an example in the case of applying the adjustment related to the adjustment of the movable objective aperture.
- the adjustment request is displayed to the operator for the adjustment of the Z coordinate of the sample stage as in the case of the movable objective aperture. It is also possible to display the adjustment image so that the adjustment can be appropriately performed.
- Electron gun 2 ... Primary electron beam, 3 ... First convergent lens, 4 ... Beam center axis adjustment aligner, 5 ... Beam center axis adjustment deflector, 6 ... -Movable objective lens, 7 ... second focusing lens, 8 ... astigmatism corrector, 9 ... aligner, 10 ... upper deflector, 11 ... lower deflector, 12 ... objective Lens ... 13 ... Sample, 14 ... Detector, 15 ... Sample stage, 21 ... High voltage control circuit, 22 ... First focusing lens control circuit, 23 ... Beam center axis adjustment Aligner control circuit, 24 ... deflector control circuit for beam center axis adjustment, 25 ...
- movable objective aperture use number discrimination sensor 26 ... second focusing lens control circuit, 27 ... astigmatism corrector Control circuit, 28 ... aligner control circuit, 29 ... deflector control circuit DESCRIPTION OF SYMBOLS 30 ... Objective lens control circuit, 31 ... Detection signal control circuit, 32 ... Sample stage drive control circuit, 41 ... Computer, 42 ... Image display device, 43 ... Storage device, 44 ... Manual operation panel, 100 ... Scanning electron microscope column
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Abstract
Description
ビーム中心軸調整用アライナー4を用いて可動対物しぼり6の中心を一次電子ビーム2が通るように調整する。ビーム中心軸調整においてはビーム中心軸調整用偏向器5によって一次電子ビーム2を可動対物しぼり6上で走査し、可動対物絞り6上での一次電子ビーム2の断面像を得る。
対物レンズ12の励磁電流を周期的に変化させ、このときの画像の動きを最小とするようにアライナー9を用いて一次電子ビーム2を調整する。
非点補正器8を用いて非点収差を補正する。
一次電子ビーム2が非点補正器8の中心からずれていると、非点補正器8を用いて非点の調整を行う際に視野が動き、調整が困難になる。このため、非点補正器8の動作に連動して動いた視野をアライナー9でキャンセルできるように調整する。
対物レンズ12の励磁電流を変化させ、試料13上に一次電子ビーム2がフォーカスするように調整する。
画像表示装置42に表示された画像の明るさコントラストを調整する。
Claims (18)
- 荷電粒子源と、
上記荷電粒子源から放出する一次荷電粒子線を集束するための集束レンズと、
上記一次荷電粒子線を試料上にフォーカスするための対物レンズと、
上記対物レンズより上記荷電粒子源側に配置される複数の対物しぼりを有する可動対物しぼりと、
上記一次荷電粒子線の照射によって試料から発生した二次信号を検出する検出器と、
上記検出器により検出された二次信号を画像処理し、処理した画像を表示する画像表示部と、
上記一次荷電粒子線の複数の照射条件を記憶する記憶部と、
上記照射条件を選択させ、配置されている対物しぼりが選択された照射条件に適合するか否かを判断し、上記対物しぼりが適合しない場合は、適合しないことを上記画像表示部に表示し、上記対物しぼりが選択された照射条件に適合する場合は、選択された照射条件に適合するように上記一次荷電粒子線を調整する事前調整を実行し、実行した結果を照射条件にかかるパラメータとして予め上記記憶部に記憶させる動作制御部と、
を備えることを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置において、
上記動作制御部は、
上記記憶部に記憶された上記複数の照射条件を、上記画像表示部に表示して選択させ、上記複数の対物しぼりのうち、配置されている対物しぼりが上記画像表示部を介して選択された照射条件に適合するか否かを判断し、上記対物しぼりが適合しない場合は、適合しないことを上記画像表示部に表示し、上記対物しぼりが選択された照射条件に適合する場合は、予め定めた調整用基準照射条件に適合するように上記一次荷電粒子線を調整し、上記画像表示部に、上記一次荷電粒子線の中心軸調整用画像を表示させ、上記対物しぼりの位置が調整されることにより、上記一次荷電粒子線の中心軸が調整されると、上記画像表示部を介して選択された照射条件に適合するように上記一次荷電粒子線を調整することを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置において、
上記事前調整した照射条件は、専用試料を用いて得られることを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置において、
上記試料を支持して移動させる試料ステージを備え、上記照射条件には、上記試料ステージにおける試料の位置も含まれ、上記試料ステージの位置は複数設定できることを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置において、
上記動作制御部は、上記事前調整を再度実行する必要があるか否かを判断し、上記事前調整を再度実行する必要がある場合は、事前調整の実行必要性を上記表示部に表示させることを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置において、
上記動作制御部は、上記対物しぼりが選択された照射条件に適合する場合は、上記対物しぼりの位置を調整する必要があるか否かと、上記対物しぼりの位置が許容範囲内に調整されたか否かを判断することを特徴とする荷電粒子線装置。 - 請求項2に記載の荷電粒子線装置において、
上記動作制御部は、上記対物しぼりが選択された照射条件に適合する場合は、上記対物しぼりの位置を調整する必要があるか否かと、上記対物しぼりの位置が許容範囲内に調整された否かを判断することを特徴とする荷電粒子線装置。 - 請求項3に記載の荷電粒子線装置において、
上記試料を支持して移動させる試料ステージを備え、上記動作制御部は、上記専用試料が上記試料ステージにセットされているか否かを判断することを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置において、
上記動作制御部は、上記事前調整を定期的に実行し、実行した事前調整による調整値に基づいて、荷電粒子線装置のメンテナンスが必要か否かを判断し、メンテナンスが必要であると判断した場合は、メンテナンスが必要であることを上記表示部に表示させることを特徴とする荷電粒子線装置。 - 荷電粒子線装置の一次荷電粒子線照射にかかる複数の照射条件を記憶部に記憶させ、
上記記憶部に記憶された複数の照射条件を選択させ、
配置されている対物しぼりが選択された照射条件に適合するか否かを判断し、
上記対物しぼりが適合しない場合は、適合しないことを上記画像表示部に表示し、
上記対物しぼりが選択された照射条件に適合する場合は、選択された照射条件に適合するように上記一次荷電粒子線を調整する事前調整を実行し、
実行した結果を照射条件にかかるパラメータとして予め上記記憶部に記憶させることを特徴とする荷電粒子線装置の調整方法。 - 請求項10に記載の荷電粒子線装置の調整方法において、
上記記憶部に記憶された上記複数の照射条件を、上記画像表示部に表示して選択させ、上記複数の対物しぼりのうち、配置されている対物しぼりが上記画像表示部を介して選択された照射条件に適合するか否かを判断し、上記対物しぼりが適合しない場合は、適合しないことを上記画像表示部に表示し、上記対物しぼりが選択された照射条件に適合する場合は、予め定めた調整用基準照射条件に適合するように上記一次荷電粒子線を調整し、上記画像表示部に、上記一次荷電粒子線の中心軸調整用画像を表示させ、上記対物しぼりの位置が調整されることにより、上記一次荷電粒子線の中心軸が調整されると、上記画像表示部を介して選択された照射条件に適合するように上記一次荷電粒子線を調整することを特徴とする荷電粒子線装置の調整方法。 - 請求項10に記載の荷電粒子線装置の調整方法において、
上記事前調整した照射条件は、専用試料を用いて得られることを特徴とする荷電粒子線装置の調整方法。 - 請求項10に記載の荷電粒子線装置の調整方法において、
上記試料は試料ステージにより支持して移動させられ、上記照射条件には、上記試料ステージにおける試料の位置も含まれ、上記試料ステージの位置は複数設定できることを特徴とする荷電粒子線装置の調整方法。 - 請求項10に記載の荷電粒子線装置の調整方法において、
上記事前調整を再度実行する必要があるか否かを判断し、上記事前調整を再度実行する必要がある場合は、事前調整の実行必要性を上記表示部に表示させることを特徴とする荷電粒子線装置の調整方法。 - 請求項10に記載の荷電粒子線装置の調整方法において、
上記対物しぼりが選択された照射条件に適合する場合は、上記対物しぼりの位置を調整する必要があるか否かと、上記対物しぼりの位置が許容範囲内に調整されたか否かを判断することを特徴とする荷電粒子線装置の調整方法。 - 請求項11に記載の荷電粒子線装置の調整方法において、
上記対物しぼりが選択された照射条件に適合する場合は、上記対物しぼりの位置を調整する必要があるか否かと、上記対物しぼりの位置が許容範囲内に調整されたか否かを判断することを特徴とする荷電粒子線装置の調整方法。 - 請求項12に記載の荷電粒子線装置の調整方法において、
上記試料は試料ステージにより支持して移動させられ、上記専用試料が上記試料ステージにセットされているか否かを判断することを特徴とする荷電粒子線装置の調整方法。 - 請求項10に記載の荷電粒子線装置の調整方法において、
上記事前調整を定期的に実行し、実行した事前調整による調整値に基づいて、荷電粒子線装置のメンテナンスが必要か否かを判断し、メンテナンスが必要であると判断した場合は、メンテナンスが必要であることを上記表示部に表示させることを特徴とする荷電粒子線装置の調整方法。
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