WO2020183551A1 - 荷電粒子ビーム装置 - Google Patents
荷電粒子ビーム装置 Download PDFInfo
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- WO2020183551A1 WO2020183551A1 PCT/JP2019/009527 JP2019009527W WO2020183551A1 WO 2020183551 A1 WO2020183551 A1 WO 2020183551A1 JP 2019009527 W JP2019009527 W JP 2019009527W WO 2020183551 A1 WO2020183551 A1 WO 2020183551A1
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- adder
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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 or ion-optical arrangement
- H01J37/05—Electron or ion-optical arrangements for separating electrons or ions according to their energy or mass
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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 or ion-optical arrangement
- H01J37/153—Electron-optical or ion-optical arrangements for the correction of image defects, e.g. stigmators
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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 or ion-optical arrangement
- H01J37/147—Arrangements for directing or deflecting the discharge along a desired path
- H01J37/1472—Deflecting along given lines
- H01J37/1474—Scanning means
- H01J37/1475—Scanning means magnetic
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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 object 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
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/153—Correcting image defects, e.g. stigmators
- H01J2237/1532—Astigmatism
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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
- H01J2237/2809—Scanning microscopes characterised by the imaging problems involved
- H01J2237/281—Bottom of trenches or holes
Definitions
- the present invention relates to a charged particle beam device.
- the circuit patterns formed on the semiconductor substrate (wafer) are rapidly becoming finer, and the importance of process monitoring for monitoring whether or not those patterns are formed as designed is important. It is increasing more and more. For example, in order to detect the occurrence of anomalies or defects (defects) in the semiconductor manufacturing process at an early stage or in advance, the circuit pattern on the wafer is measured and inspected at the end of each manufacturing process.
- the measurement inspection device such as SEM using the scanning electron beam method and the corresponding measurement inspection method
- the primary electron beam is scanned (scanned) on the sample such as the target wafer.
- the energy such as secondary electrons and reflection generated by this is detected.
- an image is generated by signal processing, image processing, or the like based on the detection, and measurement, observation, or inspection is performed based on the image.
- the secondary electrons / backscattered electrons are sent to the detector. It needs to be biased.
- the means for deflecting the secondary beam in a predetermined direction affects the primary beam, the irradiation position shift of the primary beam on the sample occurs and the measurement accuracy of the apparatus deteriorates. Therefore, a means for separating the primary beam and the secondary beam, which deflects the secondary beam (secondary electron / backscattered electron) in the direction in which the detector is installed and does not deflect the primary beam to be applied to a predetermined position of the sample, is required. ..
- Patent Document 1 As an example of prior art related to the above measurement / inspection and primary electron beam / secondary electron beam separation control, there is a technique described in Patent Document 1.
- the resolution of the measurement accuracy and the visibility of the deep groove / hole are required to be improved with the miniaturization of the circuit pattern formed on the wafer to be measured and the diversification of materials.
- a high angle (large angle) deflection of the secondary beam is required. At this time, if a large angle of deflection is realized, a problem of fluctuation of the primary beam due to a high voltage and a large current occurs. In addition, high electric and high magnetic fields that require large-angle deflection affect the in-plane uniformity of the projected image of the secondary electron beam. Therefore, in order to realize such a large angle deflection and in-plane uniformity of the secondary beam, a secondary beam deflection means having a multi-pole configuration capable of non-point correction is required.
- Patent Document 1 describes a technique of deflecting a secondary beam in an arbitrary direction by a secondary beam deflecting means having a multi-pole configuration (4-pole configuration) and causing the primary beam to travel straight without being subjected to a deflection action. There is. However, Patent Document 1 does not describe a secondary beam deflection means having a multi-pole configuration capable of non-point correction.
- An object of the present invention is to simultaneously perform deflection of a secondary beam and non-point correction of primary and secondary electron beams by a secondary beam deflection means having a multi-pole configuration in a charged particle beam device.
- the charged particle beam device of one aspect of the present invention is a detector that detects a charged particle gun that generates a primary beam, a stage on which a sample is placed, and a secondary beam that is generated from the sample in response to the primary beam.
- a multi-pole electromagnetic deflector that deflects the path of the secondary beam, and a control circuit that controls the multi-pole electromagnetic deflector.
- the multipolar electromagnetic deflector has a plurality of electric field deflectors that generate an electric field, and the same number of magnetic field deflectors as the electric field deflector that generates a magnetic field.
- control circuit has the following: A plurality of drive circuits for the electric field deflector for driving the electric field deflector, A first non-point correction common voltage generator that controls the electric field deflector and outputs a first non-point correction voltage for performing non-point correction of the primary beam or the secondary beam. A plurality of drive circuits for the magnetic field deflector for driving the magnetic field deflector, A second non-point correction common voltage generator that controls the magnetic field deflector and outputs a second non-point correction voltage for performing non-point correction of the primary beam or the secondary beam.
- An electric field common control voltage generator that outputs a common voltage for deflection for deflecting the path of the secondary beam to the detector to the drive circuit for the electric field deflector and the drive circuit for the magnetic field deflector.
- a first adder that adds the common voltage for deflection and the first non-point correction voltage input directly or after adjustment and outputs the first added voltage to the drive circuit for the electric field deflector.
- the second added voltage is added to the common voltage for deflection and the second non-point correction voltage, which are directly input or input after adjustment, and the second added voltage is output to the drive circuit for the magnetic field deflector. Adder.
- the deflection of the secondary beam and the non-point correction of the primary and secondary electron beams can be simultaneously performed by the secondary beam deflection means having a multi-pole configuration.
- FIG. It is a figure which shows the structure of the multi-pole electromagnetic deflection control circuit in the case of using the multi-pole electromagnetic deflector of the 8-pole structure of Example 1.
- FIG. It is a figure which shows the structure of the measurement inspection apparatus of the scanning electron beam type. It is a figure for demonstrating the general separation / deflection action with respect to a primary beam and a secondary beam, taking an orthogonal electromagnetic deflector of a multi-pole structure (for example, a 4-pole structure) as an example. It is a figure which shows the structure of the multi-pole electromagnetic deflector and its control circuit in the case of using the multi-pole electromagnetic deflector of a 4-pole configuration.
- a multi-pole electromagnetic deflector (beam separator) that deflects a high-energy secondary beam at a large angle and separates it from the primary beam is required in order to support deep grooves and holes and increase throughput.
- a multi-pole electromagnetic deflector consists of an electric field deflector and a magnetic field deflector.
- a configuration of a multi-pole electromagnetic deflector capable of generating a high electric field and a high magnetic field and a control circuit of a high-voltage and large-current multi-pole electromagnetic deflector are required.
- the multi-pole electromagnetic deflector has the role of deflecting the secondary beam and guiding it to the detector.
- the fluctuation of the primary beam due to the electric field and the magnetic field has become a problem.
- high electric and high magnetic fields that require large-angle deflection affect the in-plane uniformity of the projected image of the secondary electron beam.
- a multi-pole electromagnetic deflector (preferably 8 poles or more) capable of non-point correction is required. Then, in order to reduce the non-points that affect the in-plane uniformity of the secondary beam, it is necessary to apply a non-point correction voltage and a non-point correction current to the electrodes and coils of the multipolar electromagnetic deflector. In this case, the position of the primary beam is displaced due to the deflection applied to the multi-pole electromagnetic deflector and the noise of the high voltage / large current for non-point correction. Therefore, it is necessary to reduce the misalignment of the primary beam.
- a secondary beam deflecting means in which an electromagnetic deflector that separates the primary beam and deflects the secondary beam is configured to have multiple poles (particularly, 8 poles or more).
- a feature of this secondary beam deflection means is that by adopting a multi-pole configuration (particularly, 8 poles or more), the deflection of the secondary beam and the non-point correction of the primary beam and the secondary beam are performed at the same time.
- FIG. 2 shows the configuration of the entire system including the measurement and inspection device.
- the measurement inspection device 1 in the first embodiment is an application example that enables automatic measurement and automatic inspection of the target semiconductor wafer (sample 110).
- the measurement inspection device 1 includes a measurement function for measuring dimensional values in a circuit pattern of a semiconductor wafer (sample 110) and an inspection function for detecting defects (abnormalities and defects) in the pattern.
- the measurement and inspection device (system) 1 is largely composed of a scanning electron microscope 100 and a computer 200 for signal processing and control.
- the scanning electron microscope 100 includes a column 150 and a sample chamber 130, and inside the sample chamber 130, a sample table (stage) 112 on which a sample 110, which is an object of measurement / inspection, is placed, and this sample table.
- a motor 131 for driving the motor 131 is installed.
- an electron gun 101 that emits an electron beam A1 and a focusing lens (first condenser lens) through which the emitted electron beam A1 passes. It has 102, an aperture 103, a focusing lens (second condenser lens) 104, a blanking (BLK) control electrode 105, an aperture 106, a deflector (electrode) 120, an objective lens 109, and the like.
- the column 150 includes a detector 107 for detecting secondary electrons / backscattered electrons (secondary beam) A11 generated from the sample 110 by the irradiated electron beam (primary beam) A1 and a secondary beam A11.
- a multi-pole electromagnetic deflector 160 that deflects in the direction of the detector 107 is provided.
- the multi-pole electromagnetic deflector 160 is an electromagnetic deflector that deflects the secondary beam A11 toward the detector 107 and corrects the non-points of the primary beam A1 and the secondary beam A11.
- the computer 200 is configured to be stored in a control rack in the form of a PC, a control board, or the like. Each part of the computer 200 is realized by, for example, software program processing by a processor and a memory, or processing of a dedicated circuit.
- the computer 200 includes an overall control unit 210, a blanking (BLK) control circuit 201, an image shift / deflection control circuit 206 that controls the position shift and deflection scanning of the electron beam, a mechanical control unit 230, and a signal. It includes a detection unit (secondary electronic signal detection circuit) 207, an image processing unit (secondary electronic signal processing circuit) 208, a GUI unit (user interface unit) 250, and the like.
- a detection unit secondary electronic signal detection circuit
- an image processing unit secondary electronic signal processing circuit
- GUI unit user interface unit
- the primary beam A1 generated and emitted from the electron gun 101 includes a first condenser lens (focusing lens) 102, an aperture 103, and a second condenser lens (focusing lens) 104. It is focused through the image shift, moves to the irradiation center of the beam via a deflector 120 integrated with scanning, and is controlled by scanning deflection, and is irradiated while scanning on the sample 110 via an objective lens 109 or the like. When the primary beam A1 is irradiated, the secondary beam A11 is generated from the sample 110 and detected by the detector 107.
- the signal (analog signal) detected by the detector 107 is converted into a digital signal by the signal detection unit 207 (secondary electron signal detection circuit). Then, based on the digital signal, the image processing unit 208 (secondary electron signal processing circuit) generates and processes a two-dimensional image and displays it on the GUI screen. The circuit pattern is measured based on this image (in the case of the measurement function).
- the GUI unit 250 performs a process of providing an interface (GUI screen, etc.) to the user (measurement / inspector).
- the GUI unit 250 provides a GUI screen for inputting (setting) inspection conditions and the like, a GUI screen for displaying inspection results (two-dimensional images, etc.), and the like.
- the GUI unit 250 includes an input / output device such as a keyboard and a display, a communication interface unit, and the like. The user can select and execute the measurement function and the inspection function on the GUI screen.
- the overall control unit 210 follows the instructions given by the GUI unit 250, and the entire system (device) (electro-optical control unit 220, mechanical system control unit 230, image shift / deflection control circuit 206, signal detection unit 207, image processing unit). 208, stage position detection unit, etc.) is controlled.
- the overall control unit 210 may include an electro-optical control unit 220, an image shift / deflection control circuit 206, a mechanical control unit 230, etc., in response to measurement / inspection conditions and instructions input by the user on the screen of the GUI unit 250.
- the measurement process is performed by controlling.
- the overall control unit 210 receives data information such as a two-dimensional image generated through the signal processing unit 207 and the image processing unit 208 when the measurement is executed, and displays the data information on the screen of the GUI unit 250.
- the electro-optical control unit 220 follows the control from the overall control unit 210, and controls the electron gun 101, the first condenser lens (focusing lens) 102, the aperture 103, the second condenser lens (focusing lens) 104, and the blanking control in the column 100.
- the electron optics system irradiation system
- the blanking control circuit 201 controls the blanking control electrode 105 via the signal line, and when the irradiation of the sample 110 of the primary beam A1 is stopped, the orbit of the primary beam A1 is bent to make the primary beam A1 the aperture 106. To irradiate.
- the image shift / deflection control circuit 206 shifts the position of the electron beam and shifts the position of the electron beam at the shifted position by applying the deflection control signal to the deflector 120 through the signal line c1 in accordance with the control from the overall control unit 210. Controls scanning by deflection.
- the multi-pole electromagnetic deflection control circuit 303 receives a secondary beam deflection control signal (for example, voltage or voltage) through a signal line b1 with respect to the multi-pole electromagnetic deflector 160 that separates the primary beam and the secondary beam according to the control from the overall control unit 210. Current) is applied. As a result, the secondary beam is deflected in the direction of the detector 107, and control is performed so as not to affect the scanning direction of the primary beam.
- a secondary beam deflection control signal for example, voltage or voltage
- the multi-pole electromagnetic deflection control circuit 303 follows the control from the overall control unit 210 to perform non-point correction for performing non-point correction of the primary beam and the secondary beam on the multi-pole electromagnetic deflector 160 through the signal line b1. Apply a control signal.
- the multi-pole electromagnetic deflector 160 largely deflects the secondary beam and controls the non-point correction of the primary beam and the secondary beam.
- the mechanical system control unit 230 controls the mechanical system including the motor 131 and the like for driving the sample table 112 installed in the sample chamber 130. For example, it is possible to drive the motor 131 in correspondence with the scanning control of the electron beam to control the movement of the sample table 112. At this time, the rotation signal of the motor 131 is sent to the stage position detection unit (not shown) to obtain the position information of the sample table 112.
- the computer 200 (overall control unit 210, etc.) of FIG. 2 has both a measurement function and an inspection function, but may be provided with only one of them.
- the image processing unit 208 generates a measurement image at the time of measurement (measurement function), calculates the pattern dimension value in the image, and outputs the inspection image at the time of inspection (inspection function). It is generated and a process of detecting / determining a defect in the image is performed.
- a multi-pole orthogonal electromagnetic wave in which a magnetic field generated by a current control coil and an electric field generated by voltage control are orthogonal to each other.
- a deflector is used.
- the orthogonal electromagnetic deflectors are generally arranged in the X and Y directions, respectively, and deflect the secondary beam in an arbitrary direction.
- the primary beam A1 receives a force deflecting in the same direction as the electric field and only at a predetermined angle. Be biased.
- the electric field deflector 166 facing the electric field deflector 165 is composed of electrodes, respectively.
- each of the magnetic field deflector 162 facing the magnetic field deflector 161 is composed of a coil.
- the secondary beam A11 generated from the sample 110 has a traveling direction opposite to that of the primary beam A1, it is deflected in the same direction in the electric field and the magnetic field, that is, toward the electrode side.
- the angle of deflection depends on the energy of the secondary beam A11.
- This win condition is a condition in which the electric field and magnetic field generated by the orthogonal electromagnetic deflector cancel the influence on the primary beam.
- the configuration of the multi-pole electromagnetic deflection control circuit 303 when a 4-pole electromagnetic deflector is used as the multi-pole electromagnetic deflector 160 of FIG. 2 will be described.
- the secondary beam A11 is deflected, but the primary beam A1 travels straight without being deflected.
- the secondary beam A11 generated from the sample 110 by the irradiation of the primary beam A1 receives the forces from the magnetic field deflectors 161 and 162 and the electric field deflectors 165 and 166 constituting the multipolar electromagnetic deflector 160 (see FIG. 2). It is detected by being deflected in the direction of the detector 107 (see FIG. 2).
- the deflection angle of the detected secondary beam A11 (see FIG. 3) is proportional to the strength of the electric and magnetic fields generated by the multipolar electromagnetic deflector 160 and inversely proportional to the energy of the secondary beam A11.
- the energies of the secondary beam A11 from the sample 110 are different, and they are incident on the detector 107 whose mounting position is fixed. Therefore, the magnitude of the electric field / magnetic field generated by the multi-pole electromagnetic deflector 160 is controlled by the output voltage / output current of the multi-pole electromagnetic deflection control circuit 303.
- the output voltage of the voltage source circuit that controls the electric field and the output current of the current source circuit that controls the magnetic field are win so that the electric field / magnetic field generated by the multipolar electromagnetic deflector 160 does not affect the scanning position of the primary beam A1. Satisfy the conditions.
- the orthogonal electromagnetic deflection control circuit 303 generates a voltage value 3031A that determines the deflection angle of the secondary beam according to the energy of the secondary beam A11 from the electric field / magnetic field common voltage generation unit 3031.
- the generated voltage value is converted and amplified by the magnetic field drive current source circuit 3033 into a current for controlling the magnetic field, and applied to the magnetic field deflectors 171 and 172.
- the voltage value 3031A is adjusted by the gain adjusting means 3032 so that the output voltage of the voltage source circuit that controls the electric field and the output current of the current source circuit that controls the magnetic field satisfy the win condition, and the voltage drive voltage source circuit The voltage is amplified by 3034 to control the electric current and applied to the electric current deflectors 175 and 176.
- the main part of the noise of the multipolar electromagnetic deflection control circuit 303 that causes the position shift of the primary electron beam A1 becomes a common mode component for the electric field control circuit and the magnetic field control circuit. Then, the swing directions of the electric field and the magnetic field caused by the noise in this portion are opposite, and the magnitude satisfies the win condition. Furthermore, the frequency characteristics and phase characteristics of the voltage source control signal match the frequency characteristics and phase characteristics of the current source control signal.
- the noise portion of the electric field deflector and the magnetic field deflector can be canceled out with respect to the deflection force to the primary beam A1 caused by the common circuit noise of the multi-pole electromagnetic deflection control circuit 303, and the misalignment of the primary beam A1 is reduced. it can.
- the frequency characteristics and phase characteristics of the voltage source control signal and the current source control signal are matched. Therefore, the electric field deflector and the magnetic field deflector can cancel each other with respect to the deflection force to the primary beam A1 caused by the common circuit noise of the multi-pole electromagnetic deflection control circuit 303, and the positional deviation of the primary beam A1 can be reduced.
- the non-primary beam A1 and the secondary beam A11 are generated at the same time when the multi-pole electromagnetic deflector 160 greatly deflects the secondary beam A11. Point correction cannot be controlled.
- the multi-pole electromagnetic deflector 160 greatly deflects the secondary beam A11, and at the same time, the primary beam A1 and the secondary beam A11 are not generated. Control point correction.
- astigmatism occurs in the charged particle beam device due to factors such as lens material, lens processing accuracy, and lens dirt.
- astigmatism occurs, not only the beam cannot be focused finely, but also the cross section of the beam becomes elliptical. A high-resolution image cannot be obtained with the beam deformed in this way. Therefore, non-point correction is required to correct the cross-sectional shape of the beam to be circular.
- a multi-pole electromagnetic deflector 160 having an 8-pole configuration is used. Specifically, the beam is made to pass through the center of the multipolar electromagnetic deflector 106 composed of 4N (N is a natural number) quadrupoles arranged at a constant division angle along the circumference. The cross section of the beam is corrected to a circular shape by generating a magnetic field and an electric field in a direction that cancels the generated astigmatism.
- the configuration of the multi-pole electromagnetic deflection control circuit 303 when the multi-pole electromagnetic deflector 160 having an 8-pole configuration according to the first embodiment will be described.
- i means quadrupole numbers 1-8.
- the quadrupole is composed of an electrode and a coil.
- Vid means the deflection voltage applied to the electrode of the i-th quadrupole.
- Viq means the non-point voltage applied to the coil of the i-th quadrupole.
- I (i + 2) d means the deflection current applied to the coil of the i + 2nd quadrupole.
- I (i + 2) q means the non-point current applied to the coil of the i + 2nd quadrupole.
- the electric field magnetic field (EB) common control voltage generation unit 30 generates and outputs a Vid as a common voltage.
- the non-point correction voltage common voltage generation units 31, 32, 33, 34 generate and output Viq as a common voltage.
- Vid and Viq are added by the adder 35 and enter the VV voltage amplification voltage drive circuit 36.
- the VV voltage amplification voltage drive circuit 36 amplifies the voltage to generate Vid + Viq and applies it to the electrode 161 of the multi-pole electromagnetic deflector 160 having an 8-pole configuration.
- the common voltage Vid generated by the electric field (EB) common control voltage generation unit 30 enters the gain adjustment unit 37, and the gain adjustment unit 37 adjusts the gain and outputs V (i + 2) d.
- the non-point correction current common voltage generation units 38, 39, 40, 41 generate and output V (i + 2) q as a common voltage.
- V (i + 2) d and V (i + 2) q are added by the adder 42 and enter the VI conversion current drive circuit 43.
- the VI conversion current drive circuit 43 converts a voltage into a current to generate I (i + 2) d + I (i + 2) q and applies it to the coil 163 of the multi-pole electromagnetic deflector 160 having an 8-pole configuration.
- the deflection voltage and the non-point voltage are simultaneously applied to the electrode 161 of the quadrupole. Further, a deflection current and a non-point current are simultaneously applied to the coil 162 of the quadrupole i.
- the non-point correction voltage common voltage generation unit 31 corresponds to the electrodes 161 of the poles 2 and 6.
- the non-point correction voltage common voltage generation unit 32 corresponds to the electrodes 161 of the poles 4 and 8.
- the non-point correction voltage common voltage generation unit 33 corresponds to the electrodes 161 of the poles 3 and 7.
- the non-point correction voltage common voltage generation unit 34 corresponds to the electrodes 161 of the poles 1 and 5.
- non-point correction current common voltage generation unit 38 corresponds to the coils 162 of the quadrupoles 2 and 6.
- the non-point correction current common voltage generation unit 39 corresponds to the coils 162 of the poles 4 and 8.
- the non-point correction current common voltage generation unit 40 corresponds to the coils 162 of the poles 3 and 7.
- the non-point correction current common voltage generation unit 41 corresponds to the coils 162 of the poles 1 and 5.
- the relationship between the voltage and the current of the electrode 161 and the coil 162 of the quadrupole i for nonpoint correction of the primary beam A1 and the secondary beam A11 is as follows (Equation 2) to (Equation 5). That is, the non-point voltages of the opposing electrodes 161 are equal to each other. Further, the non-point currents of the opposing coils 162 are equal to each other.
- the voltage for deflecting the secondary beam applied to each electrode 161 and each electrode 161 A current applied to the coil 162 that deflects the secondary beam arranged at a position deviated by 90 degrees is generated from the electric field magnetic field (EB) common control voltage generation unit 30.
- EB electric field magnetic field
- the electrode 161 of the quadrupole 1 and the coil 162 of the quadrupole 3 the electrode 162 of the quadrupole 2 and the coil 162 of the quadrupole 4 are used.
- the non-point correction voltage applied to each electrode 161 is made the same as the non-point correction voltage applied to the electrodes 161 arranged at opposite positions.
- the non-point correction voltage common voltage generation unit 31 generates the same non-point correction voltage applied to the electrodes 161 of the dipoles 2 and 6.
- the non-point correction voltage common voltage generation unit 32 generates the same non-point correction voltage applied to the electrodes 161 of the dipoles 4 and 8.
- the non-point correction voltage common voltage generation unit 33 generates the same non-point correction voltage applied to the electrodes 161 of the dipoles 3 and 7.
- the non-point correction voltage common voltage generation unit 34 generates the same non-point correction voltage applied to the electrodes 161 of the dipoles 1 and 5.
- the circuit configuration is such that the non-point correction current applied to each coil 162 is generated from the same common voltage as the non-point correction current applied to the coils 161 arranged at opposite locations.
- the non-point correction current common voltage generation unit 38 generates a common voltage for the coils 162 of the dipoles 2 and 6 and is the same as the coils 162 of the dipoles 2 and 6 via the VI conversion current drive circuit 43. Apply the non-point correction current of.
- the non-point correction current common voltage generation unit 39 generates a common voltage for the coils 162 of the dipoles 4 and 8 and has the same non-points on the coils 162 of the dipoles 4 and 8 via the VI conversion current drive circuit 43. Apply the correction current.
- the non-point correction current common voltage generation unit 40 generates a common voltage for the coils 162 of the dipoles 3 and 7, and has the same non-points on the coils 162 of the dipoles 3 and 7 via the VI conversion current drive circuit 43. Apply the correction current. Further, the non-point correction current common voltage generation unit 41 generates a common voltage for the coils 162 of the dipoles 1 and 5, and the same non-points as the coils 162 of the dipoles 1 and 5 via the VI conversion current drive circuit 43. Apply the correction current.
- the voltages applied to each electrode 161 are the common control voltage Vid generated by the electric field (EB) common control voltage generation unit 30 and the non-point correction voltage common voltage generation units 31, 32, 33, 34.
- the point correction voltage Viq is added by the adder 35, amplified by the VV voltage amplification voltage drive circuit 36, and output.
- the current applied to each coil 162 is the common control voltage V (i + 2) d whose amplitude is adjusted by the gain adjusting unit 37 from the common control voltage Vid generated by the electric field magnetic field (EB) common control voltage generating unit 30.
- the non-point correction current common voltage V (i + 2) q generated by the non-point correction current common voltage generators 38, 39, 40, 41 is added by the adder 42 and converted by the VI conversion current drive circuit 43. It is output.
- FIG. 5 shows a deflection operation.
- FIG. 6 shows a deflection operation and a non-point correction operation.
- the direction of the magnetic field generated in the coils 51 arranged at the same location is perpendicular to the direction of the electric field generated in the electrodes 52 at the same location.
- an electric field E1 and a magnetic field B1 are generated to generate a force (one deflection vector) for deflecting the secondary beam.
- this deflection force is weak, it is necessary to arrange the detector 107 near the multi-pole electromagnetic deflector 504 having a 4-pole configuration.
- the direction of the magnetic field generated in the coils 162 arranged at the same location is the direction of the electric field generated in the electrodes 161 at the same location. Is parallel to.
- the magnetic field generated by the coils 51 arranged at the same location is the direction of the electric field generated at the electrodes 52 at the same location. Become vertical.
- the direction of the magnetic field generated in the coils 162 arranged at the same location is the direction of the electric field generated in the electrodes 161 at the same location. Is parallel to.
- the electric field E4 and the magnetic field B4 are generated in the same direction.
- a large deflection force for deflecting the secondary beam A11 is generated.
- the deflection force is strong and large angles can be deflected, so that the detector 107 can be placed far from the multi-pole electromagnetic deflector 160 with an 8-pole configuration.
- the problem of astigmatism of the primary beam A1 and the secondary beam A11 is likely to occur.
- the non-point correction of the primary beam A1 and the secondary beam A11 is performed in a state where the secondary beam A11 is deflected in an arbitrary direction at a large angle and the primary beam A1 travels straight without being subjected to the deflection action. It can be carried out. That is, in the first embodiment, in order to realize the large angle deflection and the in-plane uniformity of the secondary beam A11, a multi-pole electromagnetic deflector 160 having an 8-pole configuration capable of non-point correction is used.
- “d” means “bias” and “q” means “non-point correction”.
- Vd means the deflection voltage applied to the electrode 161.
- Vq means the non-point correction voltage applied to the electrode 161.
- Id means the deflection current applied to the coil 162.
- Iq means the non-point correction current applied to the coil 162.
- “*” Means multiplication.
- K is a coefficient for adjusting the deflection direction of the secondary beam A11.
- a coil 161 is arranged in the vicinity of or at the same position as the electrode 161, and the electrode 161 and the coil 162 perform non-point correction of the primary beam A1 and the secondary beam A11.
- the electrode 161 and the coil 161 are composed of eight quadrupoles 1 to 8.
- the eight quadrupoles 1 to 8 are arranged at a constant division angle on the circumference centered on the orbital axis of the primary beam A1.
- the shape of the beam before correction is the shape of the beam spot 60 of the beam due to the action of the electric and magnetic fields generated in the dipoles 1 to 8 by applying the voltage and current set according to the composite vector.
- the shape of the astigmatism due to the magnetic field has a relationship of being rotated by 90 ° about the beam spot shape of the beam before the astigmatism is corrected. As a result, the astigmatism of the beam before correction is canceled, and a perfectly circular beam spot 60 is obtained.
- non-point correction vectors toward the center of the primary beam A1 and the secondary beam A11 are generated.
- the beam deformed into an ellipse is corrected to a circular beam, and a perfectly circular beam spot 60 is obtained. That is, non-point correction is performed on the primary beam A1 and the secondary beam A11.
- Example 1 the case where eight quadrupoles 1 to 8 are used for the correction of astigmatism has been described, but the same technical method is also used when the number of quadrupoles is 4, 12, 16, or the like. Therefore, the astigmatism of the beam can be corrected.
- FIG. 6B is a table showing the relationship between the voltage and current applied to each of the poles 1 to 8.
- a deflection voltage and a non-point correction voltage are simultaneously applied to the dipoles 1 to 8 as voltages. Further, a deflection current and a non-point correction current are simultaneously applied to the quadrupoles 1 to 8 as currents.
- an electric deflection voltage ⁇ V and a non-point correction voltage + Vq are simultaneously applied to the quadrupole 1 as voltages.
- a deflection current + NI ( ⁇ 2-1) and a non-point correction current ⁇ NIq are simultaneously applied to each quadrupole 1 as currents.
- ( ⁇ 2-1) is an example of the coefficient k for adjusting the deflection direction of the secondary beam.
- a voltage deflection voltage -V ( ⁇ 2-1) and a non-point correction voltage -Vq are applied to the dipole 2 at the same time. Further, a deflection current + NI and a non-point correction current ⁇ NIq are simultaneously applied to each quadrupole 2 as currents.
- a voltage deflection voltage + V ( ⁇ 2-1) and a non-point correction voltage ⁇ Vq are simultaneously applied to the dipole 3. Further, a deflection current + NI and a non-point correction current + NIq are simultaneously applied to each quadrupole 3 as currents.
- An electric deflection voltage + V and a non-point correction voltage + Vq are simultaneously applied to the dipole 4 as voltages. Further, a deflection current + NI ⁇ 2-1 and a non-point correction current + NIq are simultaneously applied to each quadrupole 4 as currents.
- An electric deflection voltage + V and a non-point correction voltage + Vq are simultaneously applied to the dipole 5 as voltages. Further, a deflection current-NI ( ⁇ 2-1) and a non-point correction current-NIq are simultaneously applied to each quadrupole 5 as currents.
- An electric deflection voltage + V ( ⁇ 2-1) and a non-point correction voltage ⁇ Vq are simultaneously applied to the dipole 6 as voltages. Further, a deflection current-NI and a non-point correction current-NIq are simultaneously applied to each quadrupole 6 as currents.
- a voltage deflection voltage ⁇ V ( ⁇ 2-1) and a non-point correction voltage ⁇ Vq are simultaneously applied to the dipole 7. Further, a deflection current ⁇ NI and a non-point correction current + NIq are simultaneously applied to each quadrupole 7 as currents.
- An electric deflection voltage ⁇ V and a non-point correction voltage + Vq are simultaneously applied to the quadrupole 8 as voltages. Further, a deflection current ⁇ NI ( ⁇ 2-1) and a non-point correction current + NIq are simultaneously applied to each quadrupole 8 as currents.
- a multi-pole electromagnetic deflector 160 having an 8-pole configuration is used to deflect the secondary beam A11 at a large angle, and the detector 107 is arranged farther away.
- the problem of astigmatism of the primary beam A1 and the secondary beam A11 is likely to occur.
- the non-point correction of the primary beam A1 and the secondary beam A11 is performed in a state where the secondary beam A11 is deflected in an arbitrary direction at a large angle and the primary beam A1 travels straight without being subjected to the deflection action. I do.
- the beam is generated in the beam in a state where the beam is passed through the center of the multipolar electromagnetic deflector 160 composed of eight quadrupole groups 1 to 8 arranged at a constant division angle along the circumference.
- An electric field and a magnetic field in a direction for canceling the astigmatism are generated in the electrode 161 and the coil 162 of the multipolar electromagnetic deflector 160.
- the cross section of the beam is corrected to a circular shape, and a perfectly circular beam spot 60 is obtained.
- the multi-pole electromagnetic deflector having an 8-pole configuration is used as the multi-pole electromagnetic deflector 160. It will be sufficient and the accuracy will be low. Therefore, when a multi-pole electromagnetic deflector having a 4-pole configuration is used, it is difficult to satisfy the requirement of deflecting the secondary beam A11 at a large angle and arranging the detector 107 farther. Therefore, in the first embodiment, the multi-pole electromagnetic deflector 160 having an 8-pole configuration is used to deflect the secondary beam A11 at a large angle to satisfy the requirement of arranging the detector 107 farther. ..
- the primary beam A1 and the secondary beam A11 are in a state where the secondary beam A11 is deflected in an arbitrary direction at a large angle and the primary beam A1 travels straight without being subjected to the deflection action.
- Non-point correction can be performed with high accuracy.
- the difference from the multi-pole electromagnetic deflection control circuit 303 of the first embodiment shown in FIG. 1 is that the non-point correction voltage common voltage generator that applies the non-point correction voltage to the electrodes 161 of the poles 2, 6, 3, and 7. 70, a non-point correction voltage common voltage generator 71 that applies a non-point correction voltage to the electrodes 161 of the poles 1, 5, 4, and 8, and a non-point correction current to the coils 162 of the poles 3, 7, 4, and 8.
- the non-point correction current common voltage generation unit 72 to be applied and the non-point correction current common voltage generation unit 73 to apply the non-point correction current to the coils 162 of the poles 1, 5, 2, and 6 are provided.
- the electric field magnetic field (EB) common control voltage generation unit 30 generates and outputs a Vid as a common voltage.
- the non-point correction voltage common voltage generation units 70 and 71 generate and output Viq as a common voltage.
- Vid and Viq are added by the adder 35 and enter the VV voltage amplification voltage drive circuit 36.
- the VV voltage amplification voltage drive circuit 36 amplifies the voltage to generate Vid + Viq and applies it to the electrode 161 of the multi-pole electromagnetic deflector 160 having an 8-pole configuration.
- the common voltage Vid generated by the electric field (EB) common control voltage generation unit 30 enters the gain adjustment unit 37, and the gain adjustment unit 37 adjusts the gain and outputs V (i + 2) d.
- the non-point correction current common voltage generation units 72 and 73 generate and output V (i + 2) q as a common voltage.
- V (i + 2) d and V (i + 2) q are added by the adder 42 and enter the VI conversion current drive circuit 43.
- the VI conversion current drive circuit 43 converts a voltage into a current to generate I (i + 2) d + I (i + 2) q and applies it to the coil 163 of the multi-pole electromagnetic deflector 160 having an 8-pole configuration.
- the deflection voltage and the non-point voltage are simultaneously applied to the electrode 161 of the quadrupole i. Further, a deflection current and a non-point current are simultaneously applied to the coil 162 of the quadrupole i.
- the secondary beam A11 is deflected at a large angle in an arbitrary direction, and the primary beam A1 travels straight without being subjected to the deflection action, and the primary beams A1 and 2 Non-point correction of the next beam A11 can be performed with high accuracy.
- a charged particle gun that generates a primary beam, a stage on which a sample is placed, a detector that detects a secondary beam generated from the sample in response to the primary beam, and a number that deflects the course of the secondary beam.
- a charged particle beam device including a polar electromagnetic deflector and a control circuit for controlling the multipolar electromagnetic deflector.
- the electron is an example of a charged particle.
- the multi-pole electromagnetic deflector is: A plurality of electric field deflectors that generate an electric field (an electrode or an electrode that also serves as a coil core is an example). It has the same number of magnetic field deflectors (coils are an example) as the electric field deflectors that generate a magnetic field.
- the control circuit is: A drive circuit for an electric field deflector that drives the electric field deflector (a circuit that outputs a voltage by inputting a voltage such as the VV voltage amplification voltage drive circuit 36 in FIGS. 1 and 7 is an example thereof, and the electric field deflector is used. Other inputs and outputs may be used as long as it is a circuit to act).
- a first non-point correction common voltage generator (non-points in FIGS. 1 and 7) that controls the electric field deflector and outputs a first non-point correction voltage for performing non-point correction of the primary beam or the secondary beam. It may be an output other than the voltage output, such as the correction voltage common voltage generators 31 to 34).
- a drive circuit for a magnetic field deflector that drives the magnetic field deflector (a circuit that outputs a current by inputting a voltage such as the VI conversion current drive circuit 43 in FIGS. 1 and 7 is an example thereof, and operates the electric field deflector. Other inputs and outputs may be used as long as the circuit is to be used).
- a second non-point correction common voltage generator (non-points in FIGS. 1 and 7) that controls the magnetic field deflector and outputs a second non-point correction voltage for performing non-point correction of the primary beam or the secondary beam. It may be an output other than the voltage output, such as the correction voltage common voltage generator 38 to 41).
- An electric field common control voltage generator that outputs a common voltage for deflection to the drive circuit for the electric field deflector and the drive circuit for the magnetic field deflector to deflect the path of the secondary beam to the detector.
- the output may be other than voltage
- a first adder that adds the common voltage for deflection and the first non-point correction voltage input directly or after adjustment and outputs the first added voltage to the drive circuit for the electric field deflector.
- a second adder that adds the common voltage for deflection and the second non-point correction voltage input directly or after adjustment and outputs the second added voltage to the drive circuit for the magnetic field deflector.
- An example of an adder is an operational amplifier or a unit that combines A / D conversion, D / A conversion, and a CPU, but other circuits and units may be used as long as the inputs can be added and output.
- the plurality of electric field deflectors and the plurality of magnetic field deflectors are arranged in a circumferential shape (for example, the circumference of a circumference or a regular polygon as shown in FIGS. 1 and 7 or the outer circumference of a line-symmetrical or point-symmetrical figure). You may.
- the common voltage for deflection is a predetermined magnetic field arranged at a position deviated by 90 degrees clockwise or counterclockwise from a predetermined first adder corresponding to the predetermined electric field deflector and the predetermined electric field deflector. It may be a direct or adjusted input with a predetermined second adder corresponding to the deflector.
- the charged particle beam device may also be: When each of the number of electrodes and the number of coils of the multi-pole electromagnetic deflector is N (where N is an even number of 8 or more), the control circuit is: A plurality of electrode drive circuits for driving the electrodes, Multiple electrode adders and A plurality of coil drive circuits for driving the coil, Multiple coil adders and Multiple electric and magnetic field common control voltage generators and Multiple non-point correction common voltage generators for electrodes, Multiple non-point correction common voltage generators for coils, Have.
- each of the number of non-point correction common voltage generators for electrodes and the number of non-point correction common voltage generators for coils, which the control circuit has, is N / G (however, G is an even number of 2 or more). is there. In the configuration of FIG. 1, G is 2, and in the configuration of FIG. 7, G is 4, but any even number of 2 or more may be used.
- the component [i] when the i-th (assuming to start from the first) component among the virtual or physical components of the plurality of charged particle beam devices is referred to as the component [i]:
- the electrode [n], the electrode drive circuit [n], and the electrode adder [n] correspond to 1: 1: 1 (where n is a natural number of N or less).
- the coil [c], the coil drive circuit [c], and the coil adder [c] correspond to 1: 1: 1 (however, c is a natural number of N or less, and n and 1). Has a 1: 1 correspondence)
- the electric / magnetic field common control voltage generator [n] outputs the first voltage [n] to the electrode adder [n] and the coil adder [c].
- the non-point correction common voltage generator [j] for the electrode is at least the electrode adder [j] and the electrode adder [1+ ((j-1 + N / 2) Mod N)].
- Outputs 2 voltage [j] (however, j is a natural number of N / G or less).
- the coil non-point correction common voltage generator [k] includes at least a coil adder [k] and a coil adder [1+ ((k-1 + N / 2) Mod N)].
- Outputs 3 voltage [k] (however, k is a natural number of N / G or less), Is.
- a Mod B refers to an operator that finds the remainder when A is divided by B.
- a natural number refers to an integer starting from 1.
- the plurality of the electrodes may be arranged around the space through which the primary beam passes, and the electrode [n] may be arranged next to the electrode "(n + 1) Mod N]. Further, the plurality of the coils may be arranged. It may be arranged around the space through which the primary beam passes, and the coil [c] may be arranged next to the coil [(c + 1) Mod N].
- FIGS. 1 and 7 also include the electric field common control voltage generator. , It may be arranged between the drive circuit for electrodes (or the adder for electrodes). Further, it may be arranged between the non-point correction common voltage generation unit and each drive circuit.
- the gain adjustment of the gain adjustment unit may consider frequency filtering as a part of the adjustment, except when the value obtained by multiplying the input by a predetermined magnification is output.
- control circuit may be a part or all of a digital circuit.
- the electrode, the drive circuit for the electrode, the adder for the electrode, the coil, the drive circuit for the coil, the adder for the coil, the electric field magnetic field common control voltage generator, and the non-point correction common voltage generator for the electrode are preferable.
- the first of the non-point correction common voltage generation unit for the coil and the gain adjustment unit is selected from the respective types of components. However, the above may be satisfied when a specific component is set as the first.
- the present invention is not limited to this, and the multi-pole electromagnetic deflection having a 4-pole configuration with four quadrupoles is not limited to this. It can also be applied to a device, a multi-pole electromagnetic deflector having a 12-pole structure with 12 quadrupoles, a 16-pole electromagnetic deflector having 16 quadrupoles, and the like. That is, it can be applied to a multi-pole electromagnetic deflector composed of 4N (N is a natural number) quadrupoles.
- the present invention is also applicable to a multi-beam device using a multi-beam.
- Measurement and inspection device (system) 30 Field and magnetic field (EB) common control voltage generation unit 31 Non-point correction voltage common voltage generation unit 32 Non-point correction voltage common voltage generation unit 33 Non-point correction voltage common voltage generation unit 34 Non-point correction voltage common voltage generation unit 35 Adder 36 VV voltage amplification voltage drive circuit 37 Gain adjustment unit 38 Non-point correction current common voltage generation unit 39 Non-point correction current common voltage generation unit 40 Non-point correction current common voltage generation unit 41 Non-point correction current common voltage generation Part 42 Adder 43 VI conversion current drive circuit 70 Non-point correction voltage common voltage generation unit 71 Non-point correction voltage common voltage generation 72 Non-point correction current common voltage generation 73 Non-point correction current common voltage generation 100 Scanning Type electron microscope (column) 101 Electron gun 102 1st condenser lens (condenser lens) 103 Aperture 104 Second condenser lens (condenser lens) 105 Blanking (BLK) control electrode 106 Aperture 107 Detector (secondary electron / backscattered electron detector) 109
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Abstract
Description
前記電界偏向器を駆動させる電界偏向器用駆動回路を、複数と、
前記電界偏向器を制御し、前記一次ビーム又は二次ビームの非点補正を行う第1の非点補正用電圧を出力する、第1非点補正共通電圧生成部と、
前記磁界偏向器を駆動させる磁界偏向器用駆動回路を、複数と、
前記磁界偏向器を制御し、前記一次ビーム又は二次ビームの非点補正を行う第2の非点補正用電圧を出力する、第2非点補正共通電圧生成部と、
前記電界偏向器用駆動回路と、前記磁界偏向器用駆動回路と、に対し、前記二次ビームの進路を前記検出器に偏向させるための偏向用共通電圧を出力する、電界磁界共通制御電圧生成部と、
直接入力又は調整後に入力された、前記偏向用共通電圧及び前記第1の非点補正用電圧を加算し、前記電界偏向器用駆動回路に第1の加算後電圧を出力する、第1の加算器と、 直接入力又は調整後に入力された、前記偏向用共通電圧及び前記第2の非点補正用電圧を加算し、前記磁界偏向器用駆動回路に第2の加算後電圧を出力する、第2の加算器。
計測検査装置を含んで成るシステム全体の構成を図2に示す。実施例1における計測検査装置1は、対象の半導体ウェハ(試料110)の自動計測および自動検査を可能とする適用例である。本計測検査装置1は、半導体ウェハ(試料110)の回路パターンにおける寸法値を計測する計測機能、及び同パターンにおける欠陥(異常や不良)を検出する検査機能を備える。
以上、本明細書では下記を説明した。なお、本実施例を実施するために一部の項目を省略してもよい。
電界を発生させる、複数の電界偏向器(電極、又はコイルの芯を兼用した電極はその一例である)と、
磁界を発生させる、前記電界偏向器と同数の磁界偏向器(コイルはその一例である)と、を有する。
前記電界偏向器を駆動させる電界偏向器用駆動回路(図1及び7の、V-V電圧増幅電圧駆動回路36のような電圧を入力として、電圧を出力する回路はその一例で、電界偏向器を行動させる回路であれば他の入力と出力であってもよい)を、複数と、
前記電界偏向器を制御し、前記一次ビーム又は二次ビームの非点補正を行う第1の非点補正用電圧を出力する、第1非点補正共通電圧生成部(図1及び7の非点補正電圧共通電圧生成部31乃至34のような、電圧を出力とする以外の出力であってもよい)と、
前記磁界偏向器を駆動させる磁界偏向器用駆動回路(図1及び7の、V-I変換電流駆動回路43のような電圧を入力として、電流を出力する回路はその一例で、電界偏向器を行動させる回路であれば他の入力と出力であってもよい)を、複数と、
前記磁界偏向器を制御し、前記一次ビーム又は二次ビームの非点補正を行う第2の非点補正用電圧を出力する、第2非点補正共通電圧生成部(図1及び7の非点補正電圧共通電圧生成部38乃至41のような、電圧を出力とする以外の出力であってもよい)と、
前記電界偏向器用駆動回路と、前記磁界偏向器用駆動回路と、に対し、前記二次ビームの進路を前記検出器に偏向させるための偏向用共通電圧を出力する、電界磁界共通制御電圧生成部(出力が電圧以外であってもよい)と、
直接入力又は調整後に入力された、前記偏向用共通電圧及び前記第1の非点補正用電圧を加算し、前記電界偏向器用駆動回路に第1の加算後電圧を出力する、第1の加算器と、
直接入力又は調整後に入力された、前記偏向用共通電圧及び前記第2の非点補正用電圧を加算し、前記磁界偏向器用駆動回路に第2の加算後電圧を出力する、第2の加算器と、
を有してもよい。
前記多極電磁偏向器が有する、前記電極の数及び前記コイルの数、の各々はN(ただしNは8以上の偶数)である場合、前記制御回路は:
複数の、前記電極を駆動させる電極用駆動回路と、
複数の、電極用加算器と、
複数の、前記コイルを駆動させるコイル用駆動回路と、
複数の、コイル用加算器と、
複数の、電界磁界共通制御電圧生成部と、
複数の、電極用非点補正共通電圧生成部と、
複数の、コイル用非点補正共通電圧生成部と、
を有する。なお、前記制御回路が有する、前記電極用駆動回路の数、前記電極用加算器の数、前記コイル用駆動回路の数、前記コイル用加算器の数、及び前記電界磁界共通制御電圧生成部の数、の各々はNである。また、前記制御回路が有する、前記電極用非点補正共通電圧生成部の数及びコイル用非点補正共通電圧生成部の数、の各々はN/G(ただし、Gは2以上の偶数)である。なお、図1の構成ではGは2であり、図7の構成ではGは4であるが、2以上の偶数であれば他の偶数でもよい。
(A)電極[n]と、電極用駆動回路[n]と、電極用加算器[n]と、は1:1:1に対応し(ただしnはN以下の自然数)、
(B)コイル[c]と、コイル用駆動回路[c]と、コイル用加算器[c]と、は1:1:1に対応し(ただしcはN以下の自然数で、かつnと1:1の対応関係を有する)、
(C)電界磁界共通制御電圧生成部[n]は、電極用加算器[n]と、コイル用加算器[c]と、に第1電圧[n]を出力し、
(D)電極用非点補正共通電圧生成部[j]は、少なくとも、電極用加算器[j]と、電極用加算器[1+((j-1+N/2) Mod N)]と、に第2電圧[j]を出力し(ただしjはN/G以下の自然数)、
(E)コイル用非点補正共通電圧生成部[k]は、少なくとも、コイル用加算器[k]と、コイル用加算器[1+((k-1+N/2) Mod N)]と、に第3電圧[k]を出力する(ただしkはN/G以下の自然数)、
である。なお、A Mod Bは、AをBで割った時のあまりを求める演算子を指す。また、自然数は1から開始される整数を指す。
30 電界磁界(E-B)共通制御電圧生成部
31 非点補正電圧共通電圧生成部
32 非点補正電圧共通電圧生成部
33 非点補正電圧共通電圧生成部
34 非点補正電圧共通電圧生成部
35 加算器
36 V-V電圧増幅電圧駆動回路
37 ゲイン調整部
38 非点補正電流共通電圧生成部
39 非点補正電流共通電圧生成部
40 非点補正電流共通電圧生成部
41 非点補正電流共通電圧生成部
42 加算器
43 V-I変換電流駆動回路
70 非点補正電圧共通電圧生成部
71 非点補正電圧共通電圧生成部
72 非点補正電流共通電圧生成部
73 非点補正電流共通電圧生成部
100 走査型電子顕微鏡(カラム)
101 電子銃
102 第1コンデンサレンズ(集束レンズ)
103 絞り
104 第2コンデンサレンズ(集束レンズ)
105 ブランキング(BLK)制御電極
106 アパーチャ
107 検出器(二次電子・反射電子検出器)
109 対物レンズ
110 試料
112 試料台(ステージ)
120 偏向器
160 多極電磁偏向器
200 コンピュータ(信号処理系)
201 ブランキング(BLK)制御回路
206 イメージシフト・偏向制御回路
207 信号検出部(二次電子信号検出回路)
208 画像処理部(二次電子信号処理回路)
210 全体制御部
220 電子光学制御部
230 機構系制御部
250 GUI部
303 多極電磁偏向制御回路
Claims (11)
- 荷電粒子ビーム装置であって、前記荷電粒子ビーム装置は:
一次ビームを生成する荷電粒子銃と、
試料を載置するステージと、
前記一次ビームに応じて前記試料から発生する二次ビームを、検出する検出器と、
前記二次ビームの進路を偏向させる多極電磁偏向器と、
前記多極電磁偏向器を制御する制御回路と、
を有し、
前記多極電磁偏向器は:
電界を発生させる、複数の電界偏向器と、
磁界を発生させる、前記電界偏向器と同数の磁界偏向器と、を有し、
前記制御回路は:
前記電界偏向器を駆動させる電界偏向器用駆動回路を、複数と、
前記電界偏向器を制御し、前記一次ビーム又は二次ビームの非点補正を行う第1の非点補正用電圧を出力する、第1非点補正共通電圧生成部と、
前記磁界偏向器を駆動させる磁界偏向器用駆動回路を、複数と、
前記磁界偏向器を制御し、前記一次ビーム又は二次ビームの非点補正を行う第2の非点補正用電圧を出力する、第2非点補正共通電圧生成部と、
前記電界偏向器用駆動回路と、前記磁界偏向器用駆動回路と、に対し、前記二次ビームの進路を前記検出器に偏向させるための偏向用共通電圧を出力する、電界磁界共通制御電圧生成部と、
直接入力又は調整後に入力された、前記偏向用共通電圧及び前記第1の非点補正用電圧を加算し、前記電界偏向器用駆動回路に第1の加算後電圧を出力する、第1の加算器と、
直接入力又は調整後に入力された、前記偏向用共通電圧及び前記第2の非点補正用電圧を加算し、前記磁界偏向器用駆動回路に第2の加算後電圧を出力する、第2の加算器と、
を有する荷電粒子ビーム装置。 - 請求項1記載の荷電粒子ビーム装置であって、
前記多極電磁偏向器が有する、複数の前記電界偏向器の数及び複数の前記磁界偏向器の数、の各々はN(ただしNは8以上である4の倍数)である、荷電粒子ビーム装置。 - 請求項2記載の荷電粒子ビーム装置であって、
複数の前記電界偏向器は周状に配置され、
複数の前記磁界偏向器は周状に配置され、
前記偏向用共通電圧は、所定の電界偏向器に対応する所定の第1の加算器と、前記所定の電界偏向器から時計回り又は反時計回りに90度ずれた位置に配置された所定の磁界偏向器に対応する所定の第2の加算器と、の直接または調整後の入力である、荷電粒子ビーム装置。 - 請求項3記載の荷電粒子ビーム装置であって、
前記電界偏向器は、電極であり、
前記磁界偏向器は、前記電極を少なくともコアの一部とするコイルである、荷電粒子ビーム装置。 - 荷電粒子ビーム装置であって、前記荷電粒子ビーム装置は:
一次ビームを生成する荷電粒子銃と、
試料を載置するステージと、
前記一次ビームに応じて前記試料から発生する二次ビームを、検出する検出器と、
前記二次ビームの進路を偏向させる、複数の電極と複数のコイルとを有する多極電磁偏向器と、
前記多極電磁偏向器を制御する制御回路と、
を有し、
前記多極電磁偏向器が有する、前記電極の数及び前記コイルの数、の各々はN(ただしNは8以上の偶数)であり、
前記制御回路は:
複数の、前記電極を駆動させる電極用駆動回路と、
複数の、電極用加算器と、
複数の、前記コイルを駆動させるコイル用駆動回路と、
複数の、コイル用加算器と、
複数の、電界磁界共通制御電圧生成部と、
複数の、電極用非点補正共通電圧生成部と、
複数の、コイル用非点補正共通電圧生成部と、
を有し、
前記制御回路が有する、前記電極用駆動回路の数、前記電極用加算器の数、前記コイル用駆動回路の数、前記コイル用加算器の数、及び前記電界磁界共通制御電圧生成部の数、の各々はNであり、
前記制御回路が有する、前記電極用非点補正共通電圧生成部の数及びコイル用非点補正共通電圧生成部の数、の各々はN/G(ただし、Gは2以上の偶数)であり、
ここで、前記荷電粒子ビーム装置が複数有する仮想又は実体の構成物の内、i番目の構成物を構成物[i]と表記するとした場合:
(A)電極[n]と、電極用駆動回路[n]と、電極用加算器[n]と、は1:1:1に対応し(ただしnはN以下の自然数)、
(B)コイル[c]と、コイル用駆動回路[c]と、コイル用加算器[c]と、は1:1:1に対応し(ただしcはN以下の自然数で、かつnと1:1の対応関係を有する)、
(C)電界磁界共通制御電圧生成部[n]は、電極用加算器[n]と、コイル用加算器[c]と、に第1電圧[n]を出力し、
(D)電極用非点補正共通電圧生成部[j]は、少なくとも、電極用加算器[j]と、電極用加算器[1+((j-1+N/2) Mod N)]と、に第2電圧[j]を出力し(ただしjはN/G以下の自然数)、
(E)コイル用非点補正共通電圧生成部[k]は、少なくとも、コイル用加算器[k]と、コイル用加算器[1+((k-1+N/2) Mod N)]と、に第3電圧[k]を出力する(ただしkはN/G以下の自然数)、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であって、
前記Nは8以上の4の整数倍であり、
前記Gは、N Mod G =0を満たす2の倍数である、荷電粒子ビーム装置。 - 請求項6記載の荷電粒子ビーム装置であって、
N=8及びG=4の場合:
(C)では:
電極用非点補正共通電圧生成部[1]は、電極用加算器[2]と、電極用加算器[6]と、電極用加算器[3]と、電極用加算器[7]と、に第2電圧[1]を出力し、
電極用非点補正共通電圧生成部[2]は、電極用加算器[1]と、電極用加算器[5]と、電極用加算器[4]と、電極用加算器[8]と、に第2電圧[2]を出力し、
(D)では:
コイル用非点補正共通電圧生成部[1]は、コイル用加算器[3]と、コイル用加算器[7]と、コイル用加算器[4]と、コイル用加算器[8]と、に第3電圧[1]を出力し、
コイル用非点補正共通電圧生成部[2]は、コイル用加算器[1]と、コイル用加算器[5]と、コイル用加算器[2]と、コイル用加算器[6]と、に第3電圧[2]を出力する、荷電粒子ビーム装置。 - 請求項6記載の荷電粒子ビーム装置であって、
前記制御部は、ゲイン調整部を有し、前記制御部が有するゲイン調整部の数はNであり、
電界磁界共通制御電圧生成部[n]と、コイル用加算器[c]と、はゲイン調整部[n]を介して接続され、
ゲイン調整部[n]は、入力された第1電圧[n]を調整し、コイル用加算器[n]に出力する、荷電粒子ビーム装置。 - 請求項6記載の荷電粒子ビーム装置であって、
複数の前記電極は、前記一次ビームが通過する空間の周辺に配置され、電極[n]は電極「(n+1) Mod N]の隣に配置され、
複数の前記コイルは、前記一次ビームが通過する空間の周辺に配置され、コイル[c]はコイル[(c+1) Mod N]の隣に配置される、荷電粒子ビーム装置。 - 請求項9記載の荷電粒子ビーム装置であって、
cとnの1:1の対応関係は、c=(n+N/4) Mod N である、荷電粒子ビーム装置。 - 請求項6記載の荷電粒子ビーム装置であって、
電界磁界共通制御電圧生成部[n]より第1電圧[n]を出力される、電極用加算器[n]と、コイル用加算器[c]と、に関し、
電極[n]と前記一次ビームを通過する仮想平面と、コイル[c]と前記一次ビームを通過する別な仮想平面と、の角度は直角である、荷電粒子ビーム装置。
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