WO2024100897A1 - 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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- WO2024100897A1 WO2024100897A1 PCT/JP2022/042114 JP2022042114W WO2024100897A1 WO 2024100897 A1 WO2024100897 A1 WO 2024100897A1 JP 2022042114 W JP2022042114 W JP 2022042114W WO 2024100897 A1 WO2024100897 A1 WO 2024100897A1
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- sample
- charged particle
- particle beam
- support member
- beam device
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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
- H01J2237/004—Charge control of objects or beams
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/04—Means for controlling the discharge
- H01J2237/047—Changing particle velocity
- H01J2237/0475—Changing particle velocity decelerating
- H01J2237/04756—Changing particle velocity decelerating with electrostatic means
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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
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
Definitions
- This disclosure relates to a charged particle beam device that irradiates a sample with a charged particle beam.
- insulator wafers that have insulator substrates such as quartz or sapphire.
- SEMs scanning electron microscopes
- an SEM electrons are generated by applying a high voltage to an electron source, and are accelerated. The electrons are then focused by a focusing lens and irradiated onto the object to be measured. At this time, secondary electrons that are generated according to the shape of the object to be measured are observed by a detector to obtain an SEM image.
- Electrons emitted from an electron source have various energies, and the energy spread ( ⁇ E) varies depending on the type of electron source.
- the electrons contained in the electron beam have different energies, which causes the electron trajectory to focus at different points, resulting in a blurred image when formed (hereafter referred to as chromatic aberration).
- ⁇ is the focusing half angle for an electron beam with a certain acceleration voltage (E)
- Cc is called the chromatic aberration coefficient of the objective lens, and is the proportional coefficient of ⁇ E/E.
- Cc is a function of the distance (working distance, WD) between the objective lens and the sample.
- the ratio of the energy width of the electron source to the acceleration voltage ( ⁇ E/E) becomes small, so the effects of chromatic aberration are reduced and the resolution is improved.
- the irradiated electrons penetrate deeper and wider into the sample. This causes secondary electrons to be generated even in areas far from the electron beam irradiation point, so the obtained image contains information about the inside of the sample and the fine structure of the measurement object surface cannot be read.
- the acceleration voltage of the electron beam is low, the ratio of the energy width of the electron source to the acceleration voltage ( ⁇ E/E) becomes large, so the effects of chromatic aberration are increased and the resolution is reduced.
- the penetration depth of the irradiated electrons into the sample becomes shallower and narrower, allowing the sample surface to be clearly observed.
- the sample holder and the wafer surface to which the retarding voltage is applied have a uniform potential, so images with the same resolution can be obtained across the entire wafer.
- an insulating wafer with an insulating substrate such as quartz or sapphire
- the wafer surface potential is affected by charging and dielectric polarization caused by electron beam irradiation.
- the retarding voltage application part the retarding voltage application part
- the acceleration voltage of the electron beam irradiated to the sample changes depending on the measurement position.
- the amount of information inside the sample changes for each measurement position, resulting in differences in the measurement images. Therefore, in the measurement of insulating wafers, a method is required to eliminate the change in wafer surface potential caused by charging and the change in distance between the sample holder and the measurement object, and to make the wafer surface potential uniform.
- Patent Document 1 describes a method of placing a sample on support pins arranged on a stage and applying a voltage to a flat electrode arranged between the stage and the sample, thereby making the potential uniform within a certain range (hereinafter referred to as the inspection area) on the sample surface where the electron beam is irradiated.
- Patent Document 1 a flat electrode is placed on the stage of the SEM, and a voltage is applied to it to equalize the potential within the inspection area.
- the range of the inspection area is within the range of the flat electrode, and the flat electrode is placed inside the platform that supports the sample (hereinafter referred to as the support pin), so the range in which the potential can be equalized and measured is limited relative to the size of the sample.
- This disclosure has been made in consideration of the above problems, and aims to provide a charged particle beam device that can measure the entire surface of a sample by making the sample surface potential uniform.
- the support member that supports the sample is formed using an insulating material, and the surface of the sample holder that contacts the support member has a first recess that increases in depth from the outside of the support member toward the support member, and the support member is disposed within the first recess.
- the charged particle beam device can measure the entire surface of the sample by making the sample surface potential uniform.
- FIG. 1 is a configuration diagram of a charged particle beam device 1 according to a first embodiment.
- a front view of the sample holder 112 in which the sample 111 is supported by four support stages 201 is shown.
- FIG. 2B is a side view of FIG. 2A.
- FIG. 2 is a diagram showing a schematic diagram of a potential distribution in the vicinity of a sample 111.
- 1 is a cross-sectional view of the sample 111, the sample holder 112, and the support table 201, taken along a line passing through the center 200 of the support table. Illustrated is a difference in the surface potential of the sample 111 for each primary electron beam irradiation point 125 with respect to the surface potential at position R3 as a reference.
- FIG. 1 shows a side cross-sectional view of a support base in which the material of the support base 201 is changed to an insulating material (hereinafter, referred to as an insulating support base 201a). Illustrated is a difference in the surface potential of the sample 111 for each primary electron beam irradiation point 125 with respect to the surface potential at position R3 as a reference. 1 shows a side cross-sectional view of an inclined recess 202 formed around an insulating support base 201a. 5B is a side cross-sectional view in which the inclined recess 202 in FIG. 5A is changed to a stepped recess 204. FIG.
- Illustrated is a difference in the surface potential of the sample 111 for each primary electron beam irradiation point 125 with respect to the surface potential at position R3 as a reference.
- the results of comparing the maximum change in the surface potential of the sample 111 for each material of the support table 201 and each inclination angle 203 are shown.
- the inside of the insulating support base 201a is cylindrical, and an inclined recess 211 is disposed inside the support base.
- FIG. 4B is a side cross-sectional view showing an example of a configuration in which the charged particle beam device 1 further includes an electrode 301 for preventing charging and dielectric polarization of the sample 111 in addition to the configuration shown in FIG. 4A.
- FIG. 8A shows equipotential lines 124 in the case where the aperture through which the primary electron beam 121 passes is set to a size such that misalignment of the electrode 301 does not cause a problem.
- This is a cross-sectional view showing a configuration of sample 111 and sample holder 112, insulating support base 201a, and electrode 301 with an enlarged hole diameter for the passage hole shown in Figure 8B, to which an inclined recess 202 with an inclination angle 203 has been added. Illustrated is a difference in the surface potential of the sample 111 for each primary electron beam irradiation point 125 with respect to the surface potential at position R3 as a reference.
- ⁇ First embodiment> 1 is a configuration diagram of a charged particle beam device 1 according to a first embodiment of the present disclosure.
- the charged particle beam device 1 is configured as an electron microscope.
- the charged particle beam device 1 includes an electron source 101, a condenser lens 102, a condenser lens 103, an aperture 104, a reflector 105, an ExB deflector 106, a detector 107, a deflector 108, a deflector 109, an objective lens 110, a sample holder 112, a stage 113, a retarding power supply 114, a display 115, and a storage device 116.
- the stage 113 can move horizontally to measure the entire surface of the sample 111.
- a voltage is applied to the stage 113 from a retarding power supply 114.
- a sample holder 112 is placed on the stage 113, and the sample 111 is held by the sample holder 112. By manipulating the stage 113, it is possible to move the sample holder 112 and the sample 111 held by it horizontally.
- the control device is a device for controlling the operation of each part, and is, for example, a computer.
- the storage device 116 stores a control table 117 that defines the control conditions such as the voltage and current of each part.
- the control device can also read the control table 117 from the storage device 116 and control each part based on the control conditions defined in the control table 117.
- Electrons emitted from the electron source 101 are focused by condenser lenses 102 and 103, and are irradiated onto the sample 111 as a primary electron beam 121 (charged particle beam).
- the aperture 104 is a member that determines the aperture angle of the primary electron beam 121 at the objective lens 110, and has a hole through which the primary electron beam 121 passes.
- Deflectors 108 and 109 deflect the primary electron beam 121 to scan it over the sample 111.
- the objective lens 110 is a lens that focuses the deflected primary electron beam 121, and thins the primary electron beam 121 by a magnetic field generated by a current flowing through an internal coil.
- Signal particles 122 are emitted from the sample 111 irradiated with the primary electron beam 121.
- signal particles emitted with an energy of 50 eV or less are called secondary electrons, and signal particles emitted with an energy of more than 50 eV and close to that of the primary electron beam 121 are called backscattered electrons.
- the signal particles 122 collide with the reflector 105 above the sample 111.
- tertiary electrons 123 are emitted from the reflector 105.
- the tertiary electrons 123 are deflected by the electric field in the ExB deflector 106 and detected by the detector 107.
- the electric field and magnetic field in the ExB deflector 106 also act on the primary electron beam 121, but the effects of the two cancel each other out on the primary electron beam 121, so the primary electron beam 121 travels straight toward the sample.
- the tertiary electrons 123 detected by the detector 107 are A/D converted from analog data to digital data in the order of measurement.
- the control device uses the digital data to create a measurement image of the sample 111.
- the measurement image is output on the display 115.
- the accuracy of the measurement image can be adjusted by the amount of landing energy of the primary electron beam 121 incident on the sample 111. Therefore, a negative voltage of several kV (hereinafter, retarding voltage) is applied to the sample 111 by the retarding power supply 114 connected to the stage 113, thereby forming an electric field between the sample 111 and the objective lens 110 that decelerates the primary electron beam 121.
- retarding voltage a negative voltage of several kV
- the voltage application path from the stage 113 to the sample 111 will be explained.
- the sample holder 112 is placed on the stage 113 to which the retarding power supply 114 is connected.
- the sample holder 112 has multiple support tables 201 (support members) on which the sample 111 is placed.
- the support tables 201 are made of a conductive material in order to apply a retarding voltage to the sample 111.
- the retarding voltage that forms the surface potential is applied to the sample 111 via the stage 113, the sample holder 112, and the support tables 201. This allows the acceleration voltage of the primary electron beam 121 to be adjusted as desired.
- the surface potential also serves to accelerate the signal particles 122 generated on the sample upward.
- the sample 111 to be measured is not limited to conductive samples; it may be insulating, such as Si, quartz, or sapphire, covered with a thin insulating film. In such cases, a uniform surface potential cannot be formed on the sample 111 due to the influence of the support table 201. This makes it impossible to control the amount of energy of the primary electron beam 121 irradiated onto the sample 111 using the retarding voltage, and an image with the desired resolution cannot be obtained. In the following description, the sample 111 is assumed to be an insulating wafer.
- FIG. 2A shows a front view of the sample holder 112 when the sample 111 is supported by four support tables 201 as an example.
- the holding of the sample 111 is omitted.
- the support tables 201 are placed on the surface of the sample holder 112 and at arbitrary positions (support points) within the surface of the sample 111, and support the sample 111 at four points.
- FIG. 2B is a side view of FIG. 2A.
- the support table 201 is disposed between the sample 111 and the sample holder 112 to prevent damage or the generation of foreign matter caused by direct contact between the sample 111 and the sample holder 112, and is configured as a protrusion that supports the sample 111.
- the support table 201 also serves as a passage for conducting the retarding voltage applied to the sample holder 112 to the sample 111, and forming an electric field in the sample to decelerate the primary electron beam 121.
- Figure 2C is a schematic diagram showing the potential distribution near the sample 111.
- the potential distribution when the primary electron beam 121 is irradiated from the objective lens 110 arranged above the sample 111 with respect to the center of the sample 111 is shown.
- Equipotential lines 124 show the potential when the primary electron beam 121 is irradiated to the sample 111.
- a retarding voltage is applied to the sample holder 112 and the support table 201.
- the sample 111 which is an insulating wafer placed in an electric field, is polarized with a bias toward positive and negative.
- the front surface of the sample 111 is negatively polarized, and the back surface is positively polarized.
- the voltage applied to the sample 111 which is an insulator, changes depending on the distance between the retarding voltage application part (the part of the surface of the sample holder 112 or the surface of the support table 201 where the potential is set by the retarding voltage) and the sample 111.
- the surface potential of the sample 111 differs between, for example, the upper part of the support table 201 and other parts. This is because the top surface of the sample holder 112 and the top surface of the support table 201 are at the same potential.
- Figure 3A is a cross-sectional view of the sample 111, sample holder 112, and support table 201, passing through the support table center 200. It is assumed that the support table 201 in Figure 3A is made of a conductive material.
- the objective lens 110 is installed above the sample 111, and the primary electron beam 121 is irradiated to the irradiation point 125 on the sample 111.
- the equipotential lines 124 generated by the voltage applied to the sample 111 and support table 201 at this time are shown.
- the irradiation position R0 of the primary electron beam 121 when irradiated to the support table center 200 is set as the origin, and the irradiation positions when the sample holder 112 is moved horizontally at regular intervals are R1, R2, and R3, respectively.
- R1 to R3 in Figure 3A respectively indicate the positional relationship of the primary electron beam irradiation point 125.
- R1 is the position on the support table 201.
- R2 is the end face position of the support table 201.
- R3 is a position away from the support table 201, and there is no support table 201 directly below the sample 111, only the sample holder 112.
- the retarding voltage is applied up to the top surface of the support base 201, so that the surface potential of the sample 111 at the point in contact with the support base 201 (for example, position R0 in Figure 3A) is more strongly affected by the retarding voltage and changes in the negative direction compared to position R3 (flat portion).
- Figure 3B shows the difference in surface potential of the sample 111 for each primary electron beam irradiation point 125, with the surface potential at position R3 as the reference.
- the vertical axis shows the surface potential difference when the surface potential of the sample 111 on the flat part (position R3) of the sample holder 112 is set to 0 V
- the horizontal axis shows the electron beam irradiation position R when the sample holder 112 is moved horizontally with the support table center 200 as the base point.
- the sample surface potential difference is shown with the flat part as the reference when the sample holder 112 is moved horizontally at a constant interval, such as from R0 to R3 shown in Figure 3A.
- FIG. 4A shows a side cross-sectional view of a support table in which the material of the support table 201 has been changed to an insulator (hereinafter, insulating support table 201a).
- insulating support table 201a an insulator
- the primary electron beam 121 is irradiated to the irradiation point 125 on the sample 111.
- the equipotential lines 124 formed by the voltage applied to the sample 111 and the insulating support table 201a are shown.
- R0 to R3 are the same as in FIG. 3A.
- the equipotential lines 124 change in the direction approaching the sample holder 112 compared to FIG. 3A. Accordingly, the surface potential of the sample 111 at the part in contact with the insulating support table 201a changes in the positive direction compared to FIG. 3A. However, due to the dielectric polarization of the insulating support table 201a, the equipotential lines are distorted near the insulating support table 201a.
- Figure 4B shows the difference in surface potential of the sample 111 for each primary electron beam irradiation point 125, with the surface potential at position R3 as the reference.
- the vertical axis shows the surface potential difference when the surface potential of the sample 111 on the flat part of the sample holder 112 is set to 0 V
- the horizontal axis shows the electron beam irradiation position R when the sample holder 112 is moved horizontally with the support stage center 200 as the base point.
- the sample surface potential is shown with the flat part as the reference when the sample holder 112 is moved horizontally at regular intervals, such as from R0 to R3 shown in Figure 4A.
- the solid line shows the surface potential when the conductive support stage 201 shown in Figure 3B is used, and the dashed dotted line shows the surface potential when the insulating support stage 201a is used.
- the material of the support base By changing the material of the support base to an insulator, it is possible to prevent the retarding voltage from being applied to the top surface of the support base. In addition, there is no difference in the distance between the surface to which the potential is set by applying the retarding voltage and the surface of the sample 111 between the location where the insulating support base 201a is located and other locations. This is because the potential of the insulating support base 201a is not affected by the retarding voltage. As a result, the equipotential lines 124 on the insulating support base 201a change in a direction approaching the sample holder 112 compared to Figure 3A.
- the sample surface potential changes in the negative direction at R0 to R2.
- the amount of change in the sample 111 surface potential cannot be reduced to a negligible value.
- Figure 5A shows a side cross-sectional view of an inclined recess 202 formed around an insulating support base 201a.
- an inclined recess 202 (first recess) is arranged, which deepens at a certain inclination angle 203 toward the support base center 200.
- the primary electron beam 121 is irradiated to the irradiation point 125 on the sample 111.
- equipotential lines 124 formed by the voltage applied to the sample 111 and the insulating support base 201a are shown.
- the surface potential of the sample 111 is affected by the dielectrically polarized insulating support base 201a and changes in the negative direction as it approaches the support base center 200.
- a recess is formed near the insulating support base 201a, which deepens toward the support base center 200.
- the insulating support base 201a is placed within this recess.
- the distance between the sample 111 and the retarding voltage application unit in the vicinity of the insulating support 201a is increased. This shifts the surface potential of the sample 111 in the positive direction, and cancels the negative potential change caused by the dielectric polarization of the insulating support 201a. Therefore, the amount of change in the surface potential of the sample 111 for each position can be further reduced.
- FIG. 5B shows a side cross-sectional view in which the inclined groove 202 in FIG. 5A has been changed to a stepped groove 204.
- Changing the shape of the groove to a stepped shape has the same effect of reducing the amount of change in the surface potential of the sample 111 as the inclined groove.
- the surface potential of the sample 111 changes depending on the distance between the sample 111 and the retarding voltage application section, so it is possible to adjust the surface potential of the sample 111 by changing the depth of the step and the width to the next step.
- Figure 5C shows the difference in surface potential of the sample 111 for each primary electron beam irradiation point 125, with the surface potential at position R3 as the reference.
- the vertical axis shows the surface potential difference when the surface potential of the sample 111 on the flat part of the sample holder 112 is set to 0V
- the horizontal axis shows the electron beam irradiation position R when the sample holder 112 is moved horizontally with the support center 200 as the base point.
- the sample surface potential is plotted with the flat part as the reference when the sample holder 112 is moved horizontally at regular intervals, such as R0 to R3 shown in Figure 4A.
- the dashed line shows the surface potential of the sample 111 when the insulating support 201a shown in Figure 4B is used.
- the two-dot dashed line shows the surface potential of the sample 111 when the recess is arranged as in Figure 5A.
- the effect of reducing the amount of change in surface potential due to the stepped digging 204 is equivalent to that of the sloping digging 202 shown in FIG. 5B, which has an inclination angle formed by the oblique side connecting the lower end of the insulating support base 201a and the surface of the sample holder 112, and the corners A and B of the stepped digging 204.
- Figure 6 shows the results of comparing the maximum change in the surface potential of the sample 111 for each material and inclination angle 203 of the support base 201.
- the vertical axis shows the maximum change in the surface potential of the sample 111 based on the flat part, and the horizontal axis shows the material of the support base and the inclination angle 203 to be compared.
- the maximum change in the surface potential of the sample is less than one-third that of the conductive support base by making the support base material insulating.
- the change in the surface potential in the positive direction due to the indentation is greater than the change in the surface potential in the negative direction due to the dielectric polarization of the sample 111 and the insulating support base 201a.
- the change in the surface potential of the sample is smaller than when only the insulating support base 201a is placed.
- the amount of change in surface potential can be suppressed to a fraction of that of a conductive support base. Furthermore, by forming a recess in the sample holder 112, it can be seen that the amount of change in surface potential can be further suppressed to a fraction of that of a conductive support base.
- the amount of change in the surface potential of the sample 111 crosses zero and changes from positive to negative, by changing the inclination angle 203 of the inclined recess 202, the amount of change in the surface potential can be set to zero and the surface potential of the sample 111 can be made uniform. As a result, the potential change occurring on the surface of the sample 111 can be reduced to a negligible level, making it possible to obtain an image with the desired resolution.
- the surface of the sample holder 112 that contacts the support base 201 is larger than the planar size of the sample 111. This makes it possible to provide a uniform surface potential over the entire surface of the sample 111. The same applies to the following embodiments.
- Figure 7A shows an example in which the inside of the insulating support base 201a is cylindrical (hereinafter, cylindrical support base 205), and an inclined recess 211 is arranged inside the support base.
- Figure 7A is a cross-sectional view of the sample 111, sample holder 112, and cylindrical support base 205 passing through the support base center 200.
- the objective lens 110 is placed directly above the sample 111. It is assumed that the sample 111 is irradiated with a primary electron beam 121.
- the bottom surface of the cylindrical support base 205 has a hole for passing a conductive fixing screw 207, and a conductive fixing part (hereinafter, inclined fixing part 206) with an inclination angle 203 at the end of the upper surface is fixed by a screw 207 inserted from the bottom of the sample holder 112.
- the retarding voltage applied to the sample holder 112 is applied to the inclined fixing part 206 via the conductive fixing screw 207.
- the inclined part of the inclined fixing part 206 forms an inclined recess 211 inside the inner wall of the cylindrical support base 205, thereby lowering the position of the surface of the sample holder 112.
- the inclined recess 211 can cancel at least a part of the change in the surface potential of the sample 111.
- Figure 7B shows an example of a configuration in which a stepped recess 212 is arranged inside the cylindrical support base 205.
- the bottom surface of the cylindrical support base 205 has a hole for passing a conductive fixing screw 207, and a conductive fixing part (hereinafter, stepped fixing part 208) with a stepped cut at the end of the top surface is fixed by the conductive fixing screw 207 inserted from the bottom of the sample holder 112.
- the retarding voltage applied to the sample holder 112 is applied to the stepped fixing part 208 via the conductive fixing screw 207.
- the stepped part of the stepped fixing part 208 forms a stepped recess 212 on the inside of the cylindrical support base 205, thereby lowering the surface position of the sample holder 112.
- the insulating support 201a is dielectrically polarized in addition to the sample 111, so the sample surface potential changes in a negative direction compared to other portions. Therefore, by making the shape of the support cylindrical, the contact area between the sample 111 and the insulating support 201a is reduced, and the potential change caused by the dielectric polarization is reduced.
- a slanted groove 211 or a stepped groove 212 is formed on the inside of the cylindrical support 205 to increase the distance between the retarding voltage application portion and the sample 111, and the surface potential of the sample 111 is changed in a positive direction.
- the sample surface potential change occurring at the contact portion between the cylindrical support 205 and the sample 111 is canceled by the groove arranged on the inside of the cylindrical support 205, thereby reducing the surface potential change of the sample 111 occurring near the support portion.
- the recess on the inside of the cylindrical support base 205 can be effective to the extent that it is formed to cancel at least a portion of the change in the sample surface potential that occurs at the contact area between the cylindrical support base 205 and the sample 111. By combining this with the recess on the outer periphery of the support base described in embodiment 1, the change in the surface potential can be further suppressed.
- ⁇ Third embodiment> In the configuration shown in Fig. 5A in which an inclined recess 202 having an inclination angle 203 is disposed near an insulating support base 201a, the surface potential of the sample 111 is uniformly shifted in the positive direction compared to the retarding voltage due to the dielectric polarization of the sample 111 and the insulating support base 201a, charging due to irradiation with the primary electron beam 121, and a change in distance from the retarding voltage application unit. Therefore, in the third embodiment of the present disclosure, a configuration for suppressing the uniform shift in the surface potential of the sample 111 will be described with reference to Figs. 8A, 8B, 9, and 10. The matters described in the first and second embodiments but not described in the third embodiment can also be applied to the third embodiment unless there are special circumstances.
- FIG. 8A is a side cross-sectional view showing an example configuration in which the charged particle beam device 1 further includes an electrode 301 for preventing charging and dielectric polarization of the sample 111 in addition to the configuration shown in FIG. 4A.
- the electrode 301 is placed above the sample 111, and a negative voltage of the same polarity and value as the sample holder 112 is applied to it.
- the objective lens 110 is placed above the electrode 301, and the primary electron beam 121 is irradiated to an irradiation point 125 on the sample 111.
- the equipotential lines 124 formed by the voltages applied to the sample 111 and the insulating support stand 201a at this time are shown.
- R0 to R3 are the same as in FIG. 4A.
- a hole for the primary electron beam 121 is placed at the center of the electrode 301, and a negative voltage equal to the retarding voltage is applied to the electrode 301. Therefore, no electric field is generated between the sample holder 112 and the electrode 301, and dielectric polarization of the sample 111 can be prevented.
- the voltage (retarding voltage) applied to the electrode 301 it is possible to control the acceleration voltage of the primary electron beam 121 by the retarding voltage, and it becomes possible to obtain an image with the desired resolution.
- this method has the problem that the primary electron beam 121 is decelerated on the surface of the electrode 301 rather than on the surface of the sample 111, so the distance the decelerated electrons travel before irradiating the sample 111 is long.
- the ratio ( ⁇ E/E) between the energy width of the electron source and the acceleration voltage becomes large, so the effect of chromatic aberration also becomes large.
- the diameter of the central hole of the electrode 301 must be made very small.
- the smaller the central hole diameter the greater the decrease in resolution.
- FIG. 8B shows equipotential lines 124 when the passage hole of the primary electron beam 121 shown in FIG. 8A is sized so that misalignment of the electrode 301 does not cause a problem.
- the other configurations are the same as those in FIG. 8A.
- the diameter of the passage hole arranged in the electrode 301 is increased (for example, the hole diameter is made larger than the surface size of the insulating support base 201a), the effect of misalignment of the electrode 301 is reduced.
- potential changes occur in the surface potential of the sample 111 due to charging, dielectric polarization, and the distance between the retarding voltage application unit and the sample 111.
- the configuration of embodiment 1 can be used in combination.
- Figure 9 is a cross-sectional view of the sample 111, sample holder 112, insulating support 201a, and electrode 301 with a large hole diameter passing through the support center 200 shown in Figure 8B, with an inclined recess 202 with an inclination angle 203 added.
- the equipotential lines 124 formed by the voltage applied to the sample 111 and insulating support 201a are shown.
- the position R0 of the primary electron beam 121 when irradiated to the support center is set as the origin, and the sample holder 112 is moved horizontally at regular intervals to R1, R2, and R3, respectively.
- R1 to R3 in Figure 9 show the positional relationship of the primary electron beam irradiation point 125.
- R1 is the position on the insulating support 201a
- R2 is the end face position of the insulating support 201a
- R3 is a position away from the insulating support 201a, and there is no insulating support 201a directly below the sample 111, only the sample holder 112.
- Figure 10 shows the difference in surface potential of the sample 111 for each primary electron beam irradiation point 125, with the surface potential at position R3 as the reference.
- the vertical axis shows the surface potential of the sample 111
- the horizontal axis shows the electron beam irradiation position R when the sample holder 112 is moved horizontally with the support table center 200 as the base point.
- the retarding voltage applied to the sample 111 when the sample holder 112 is moved horizontally at a constant interval, such as from R0 to R3 shown in Figures 8A, 8B, and 9, is Vr
- the surface potential in Figures 8A, 8B, and 9 are plotted.
- the solid line shows the surface potential of the sample 111 generated in Figure 8A
- the dashed line shows the surface potential of the sample 111 generated in Figure 8B
- the dashed double-dot line shows the surface potential of the sample 111 generated in Figure 9.
- the present disclosure is not limited to the above-described embodiments, and includes various modified examples.
- the above-described embodiments have been described in detail to clearly explain the present disclosure, and it is not necessary to include all of the configurations described.
- a part of an embodiment can be replaced with a configuration of another embodiment.
- a configuration of another embodiment can be added to a configuration of an embodiment.
- a part of the configuration of each embodiment can be added to, deleted from, or replaced with a part of the configuration of another embodiment.
- an electron microscope is given as an example of a charged particle beam device 1, but the configuration according to the present disclosure can also be applied to other devices that irradiate charged particle beams.
- examples of the sample 111 made of an insulating material include, for example, a semiconductor wafer or a photomask that uses an insulating material as a substrate, but are not limited to these, and the present disclosure can be applied to other insulating samples.
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Abstract
Description
図1は、本開示の実施形態1に係る荷電粒子ビーム装置1の構成図である。荷電粒子ビーム装置1は、電子顕微鏡として構成されている。荷電粒子ビーム装置1は、電子源101、コンデンサレンズ102、コンデンサレンズ103、絞り104、反射板105、ExB偏向器106、検出器107、偏向器108、偏向器109、対物レンズ110、試料ホルダ112、ステージ113、リターディング電源114、ディスプレイ115、記憶装置116を備える。
本開示の実施形態2に係る荷電粒子ビーム装置1の構成例について図7A、図7Bを用いて説明する。実施形態1に記載されているが実施形態2において未記載の事項は、特段の事情がない限り、実施形態2においても適用できる。
図5Aに示す絶縁性支持台201a近傍に傾斜角203を持った傾斜状堀込202を配置した構成においては、試料111と絶縁性支持台201aそれぞれの誘電分極、1次電子ビーム121照射による帯電、リターディング電圧印加部からの距離の変化を原因として、試料111表面電位がリターディング電圧と比較して正の方向に均一にずれている。そこで本開示の実施形態3においては、試料111の表面電位の均一なずれを抑制する構成について、図8A、図8B、図9、図10を用いて説明する。実施形態1~2に記載され実施形態3に未記載の事項は、特段の事情がない限り、実施形態3においても適用できる。
本開示は、上述した実施形態に限定されるものでなく、様々な変形例を含んでいる。例えば、上述した実施形態は、本開示を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備える必要はない。また、ある実施形態の一部を他の実施形態の構成に置き換えることができる。また、ある実施形態の構成に他の実施形態の構成を加えることもできる。また、各実施形態の構成の一部について、他の実施形態の構成の一部を追加、削除または置換することもできる。
Claims (12)
- 試料に対して荷電粒子ビームを照射する荷電粒子ビーム装置であって、
前記試料を載置する支持部材、
前記支持部材を支持する試料ホルダ、
を備え、
前記支持部材は絶縁材料を用いて形成されており、
前記試料ホルダの前記支持部材と接する側の面は、前記支持部材の外側から前記支持部材に向かって深さが増す第1凹部を有し、
前記支持部材は、前記第1凹部内に配置されている
ことを特徴とする荷電粒子ビーム装置。 - 前記第1凹部は、前記支持部材の外側から前記支持部材に向かって深くなる傾斜または段差によって構成されている
ことを特徴とする請求項1記載の荷電粒子ビーム装置。 - 前記傾斜は、前記試料ホルダの表面に対して、60°±15°の角度を有する
ことを特徴とする請求項2記載の荷電粒子ビーム装置。 - 前記試料ホルダの前記支持部材と接する側の面は、前記試料よりも広い面積を有する
ことを特徴とする請求項1記載の荷電粒子ビーム装置。 - 前記荷電粒子ビーム装置はさらに、前記試料ホルダに対して電圧を印加することにより前記荷電粒子ビームを減速させる電場を発生させる電源を備え、
前記支持部材は、前記試料を複数の支持点によって支持するように配置されており、
前記第1凹部は、
前記電源が前記電圧を印加しているときにおいて、前記試料のうち前記支持点によって支持されている部位の電位と前記支持点によって支持されていない部位の電位との間の電位差が、前記第1凹部の存在しない場合よりも小さくなる
ように構成されている
ことを特徴とする請求項1記載の荷電粒子ビーム装置。 - 前記支持部材は、筒形状を有することにより、前記筒の頂部によって前記試料を支持するように構成されている
ことを特徴とする請求項1記載の荷電粒子ビーム装置。 - 前記試料ホルダの前記支持部材と接する側の面は、前記筒形状の内部から前記筒形状の内壁に向かって深さが増す第2凹部を有する
ことを特徴とする請求項6記載の荷電粒子ビーム装置。 - 前記荷電粒子ビーム装置はさらに、前記試料ホルダに対して電圧を印加することにより前記荷電粒子ビームを減速させる電場を発生させる電源を備え、
前記第2凹部は、前記試料ホルダのうち前記電圧が印加される部位と前記試料との間の距離を前記試料ホルダの他の部位よりも増やすことにより、前記支持部材と前記試料が接触する接触部位において前記支持部材の誘電分極によって生じる前記試料の表面電位の変動分のうち少なくとも一部を、キャンセルするように構成されている
ことを特徴とする請求項7記載の荷電粒子ビーム装置。 - 前記荷電粒子ビーム装置はさらに、前記荷電粒子ビームを出射するビーム源と前記試料との間に配置された電極を備え、
前記荷電粒子ビーム装置はさらに、前記試料ホルダに対して電圧を印加することにより前記荷電粒子ビームを減速させる電場を発生させる電源を備え、
前記電源は、前記電源が前記試料ホルダに対して印加する電圧と同じ極性の電圧を前記電極に対して印加することにより、前記試料の誘電分極を抑制する
ことを特徴とする請求項1記載の荷電粒子ビーム装置。 - 前記電源は、前記試料ホルダに対して印加する電圧値と同じ電圧値を前記電極に対して印加する
ことを特徴とする請求項9記載の荷電粒子ビーム装置。 - 前記電極は、前記荷電粒子ビームが通過する孔を有し、
前記孔の開口サイズは、前記支持部材の平面サイズよりも大きい
ことを特徴とする請求項9記載の荷電粒子ビーム装置。 - 前記試料は、絶縁材料を基板として用いた半導体基板である
ことを特徴とする請求項1記載の荷電粒子ビーム装置。
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| DE112022007821.9T DE112022007821T5 (de) | 2022-11-11 | 2022-11-11 | Vorrichtung für einen Strahl geladener Teilchen |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08250057A (ja) * | 1995-03-08 | 1996-09-27 | Jeol Ltd | 走査電子顕微鏡の試料ホルダー |
| JP2015099701A (ja) * | 2013-11-19 | 2015-05-28 | 株式会社日立ハイテクノロジーズ | 試料計測装置 |
| JP2015185528A (ja) * | 2014-03-26 | 2015-10-22 | 株式会社アドバンテスト | ステージ装置および電子線装置 |
| WO2017179145A1 (ja) * | 2016-04-13 | 2017-10-19 | 株式会社日立ハイテクノロジーズ | 荷電粒子線装置および試料ホルダ |
| WO2020188645A1 (ja) * | 2019-03-15 | 2020-09-24 | 株式会社ニコン | 荷電粒子装置、支持装置及び観察方法 |
| US20210028052A1 (en) * | 2019-07-25 | 2021-01-28 | Samsung Electronics Co., Ltd. | Lift pin alignment method and alignment apparatus and substrate processing apparatus |
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|---|---|---|---|---|
| JP4519567B2 (ja) * | 2004-08-11 | 2010-08-04 | 株式会社日立ハイテクノロジーズ | 走査型電子顕微鏡およびこれを用いた試料観察方法 |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08250057A (ja) * | 1995-03-08 | 1996-09-27 | Jeol Ltd | 走査電子顕微鏡の試料ホルダー |
| JP2015099701A (ja) * | 2013-11-19 | 2015-05-28 | 株式会社日立ハイテクノロジーズ | 試料計測装置 |
| JP2015185528A (ja) * | 2014-03-26 | 2015-10-22 | 株式会社アドバンテスト | ステージ装置および電子線装置 |
| WO2017179145A1 (ja) * | 2016-04-13 | 2017-10-19 | 株式会社日立ハイテクノロジーズ | 荷電粒子線装置および試料ホルダ |
| WO2020188645A1 (ja) * | 2019-03-15 | 2020-09-24 | 株式会社ニコン | 荷電粒子装置、支持装置及び観察方法 |
| US20210028052A1 (en) * | 2019-07-25 | 2021-01-28 | Samsung Electronics Co., Ltd. | Lift pin alignment method and alignment apparatus and substrate processing apparatus |
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