WO2021130843A1 - イオンミリング装置 - Google Patents
イオンミリング装置 Download PDFInfo
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- WO2021130843A1 WO2021130843A1 PCT/JP2019/050527 JP2019050527W WO2021130843A1 WO 2021130843 A1 WO2021130843 A1 WO 2021130843A1 JP 2019050527 W JP2019050527 W JP 2019050527W WO 2021130843 A1 WO2021130843 A1 WO 2021130843A1
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- ion
- ion beam
- measuring member
- ion source
- beam current
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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
- H01J37/24—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
- H01J37/243—Beam current control or regulation circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/30—Electron-beam or ion-beam tubes for localised treatment of objects
- H01J37/305—Electron-beam or ion-beam tubes for localised treatment of objects for casting, melting, evaporating or etching
- H01J37/3053—Electron-beam or ion-beam tubes for localised treatment of objects for casting, melting, evaporating or etching for evaporating or etching
- H01J37/3056—Electron-beam or ion-beam tubes for localised treatment of objects for casting, melting, evaporating or etching for evaporating or etching for microworking, e.g. etching of gratings, trimming of electrical components
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/16—Vessels; Containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/20—Means for supporting or positioning the objects or the material; Means for adjusting diaphragms or lenses associated with the support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/02—Details
- H01J2237/0203—Protection arrangements
- H01J2237/0213—Avoiding deleterious effects due to interactions between particles and tube elements
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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
- H01J2237/20—Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated
- H01J2237/202—Movement
- H01J2237/20214—Rotation
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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
- H01J2237/30—Electron or ion beam tubes for processing objects
- H01J2237/317—Processing objects on a microscale
- H01J2237/3174—Etching microareas
- H01J2237/31745—Etching microareas for preparing specimen to be viewed in microscopes or analyzed in microanalysers
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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
- H01J2237/30—Electron or ion beam tubes for processing objects
- H01J2237/317—Processing objects on a microscale
- H01J2237/31749—Focused ion beam
Definitions
- the present invention relates to an ion milling device.
- Patent Document 1 discloses an ion milling apparatus that generates plasma in an ion source, draws out ions, irradiates the extracted ions, and processes a substrate or the like.
- This ion milling device processes, for example, a 4-inch ( ⁇ 100) substrate, and electrically controls the plasma distribution in the ion source in order to obtain a large-diameter ion beam having a uniform or desired distribution. It is disclosed that the distribution of the extracted ion beam is controlled by this.
- the control method it is disclosed that the distribution state of the ion beam is measured using a Faraday cup and the voltage applied to the plasma control electrode is adjusted based on the measurement result.
- the ion milling device irradiates a sample (for example, metal, semiconductor, glass, ceramic, etc.) with an unfocused ion beam and flicks atoms on the sample surface without stress by a sputtering phenomenon, thereby causing the surface or cross section of the sample (for example, metal, semiconductor, glass, ceramic, etc.) It is a device for polishing.
- Some ion milling devices are used as pretreatment devices for observing the surface or cross section of a sample with a scanning electron microscope (SEM: Scanning Electron Microscope) or a transmission electron microscope (TEM: Transmission Electron Microscope).
- SEM Scanning Electron Microscope
- TEM Transmission Electron Microscope
- the ion beam from the penning type ion source irradiates the sample without converging, the ion distribution near the ion beam irradiation point of the sample has the highest ion density in the central part, and the ion density increases from the center to the outside. It has the property of being low.
- the ion beam is irradiated at a low incident angle while rotating the sample. This makes it possible to obtain a wide and smooth processed surface in the peripheral range including the portion to be observed. Since the ion density is directly linked to the processing speed (milling rate) of the sample, the characteristics of the ion distribution greatly affect the processed shape of the sample processed surface.
- the present invention provides an ion milling device capable of adjusting the irradiation conditions of an ion beam suitable for an ion milling device that performs pretreatment processing for observing the surface or cross section of a sample.
- the ion milling apparatus extends in the first direction with an ion source and a sample stage on which a sample processed by irradiating an unfocused ion beam from the ion source is placed. It has a measuring member holding part that holds the existing linear ion beam current measuring member and a control part, and a coating material is provided so as to cover at least the surface of the measuring member holding part and the sample stage facing the ion source.
- the material of the covering material is mainly composed of an element having a smaller atomic number than the element of the material of the structure in which the covering material is provided, and the control unit is located between the ion source and the sample stage in the first direction.
- the ion beam current measuring member is moved within the irradiation range of the ion beam while the ion beam is output from the ion source under the first irradiation condition on the orbit extending in the second direction orthogonal to the ion beam.
- the ion beam current flowing through the ion beam current measuring member is measured by irradiating the beam current measuring member.
- the reproducibility of the ion distribution of the ion milling device can be improved.
- FIG. 1 is a diagram (schematic diagram) showing a main part of the ion milling apparatus 100 according to the embodiment of the present invention from above (the vertical direction is the Y direction).
- the sample chamber 108 capable of maintaining the vacuum state
- the ion source 101 attached via the ion source position adjusting mechanism 104, the sample stage 102 for installing the sample to be processed, and the sample stage centered on the rotation center R0 are used as axes.
- a sample stage rotation drive source 103 for rotating 102 is provided.
- the ion beam distribution near the ion beam irradiation point of the sample has the highest ion density in the central part and the ion density from the center to the outside. Has the property of lowering. Since the ion density is directly related to the processing speed of the sample, the ion beam distribution near the ion beam irradiation point greatly affects the processed shape of the sample. Therefore, in order to measure the ion beam distribution of the unfocused ion beam from the ion source 101, the ion milling device 100 is arranged with the ion beam current measuring member 105 and ions arranged close to the sample mounting surface of the sample stage 102.
- Each mechanism constituting the ion milling device 100 is supplied with power from the power supply unit 110 and is controlled by the control unit 109. Further, the display unit 111 displays the control parameters of the device, the operating state, and the like.
- the ion source 101 Since the ion beam from the ion source 101 to be emitted in a state spread radially around the ion beam center B 0, must be adjusted so that the rotation center R 0 and the ion beam center B 0 of the sample stage 102 matches is there.
- the ion source 101 is attached to the sample chamber 108 via an ion source position adjusting mechanism 104 that adjusts its position in the X, Y, and Z directions.
- the position of the ion beam center B 0 of the ion source 101 specifically, the position on the XY plane (the plane including the X direction and the Y direction) and the working distance (WD: Working Distance, the position in the Z direction) are adjusted. It is possible.
- the ion beam current measuring member 105 is a conductive member, and the amount of ions colliding with the ion beam current measuring member 105 from the ion source 101 is measured between the ion source 101 and the ion beam current measuring member 105.
- the ion beam current of the above is measured by the current meter 113.
- the control unit 109 measures the ion beam current with the ammeter 113 while moving the ion beam current measuring member 105 in the X direction, thereby acquiring the ion beam current for each position along the X direction and using it as an ion beam profile. It is displayed on the display unit 111.
- the electron trap 112 when the electron trap 112 is closer to the sample stage 102 than the ion beam current measuring member 105 and the ion beam center B 0 and the ion beam current measuring member 105 intersect, it is viewed from the ion source 101.
- the ion beam current measuring member 105 and the electron trap 112 are arranged at overlapping positions.
- a predetermined positive potential is applied to the electron trap 112 from the power supply unit 110.
- a structure arranged in the sample chamber 108 specifically, a measuring member holding portion 106, a drive unit 107, a sample stage 102, a sample stage rotation drive source 103, and a covering material 120 on the inner wall of the sample chamber 108.
- a light element such as carbon
- the carbon paste may be applied to the irradiation region of the ion beam, or a carbon plate material may be attached.
- a resin having high heat resistance may be applied. This is because the organic matter contains carbon (C). Since the coating material 120 is heated by being irradiated with an ion beam, the coating material is required to have heat resistance.
- polytetrafluoroethylene (PTFE) and aromatic polyetherketone for example, PEEK: polyetheretherketone, PEK: polyetherketone
- PEEK polyetheretherketone
- PEK polyetherketone
- carbon particles may be mixed with the resin and applied. The function of the covering material will be described later.
- FIG. 2 is a schematic view showing the internal structure of the ion source 101 and the power supply circuit of the power supply unit 110 that applies the voltage of the ion source 101.
- the power supply circuit shows only the circuit related to the ion source 101.
- FIG. 2 shows an ion source (penning type ion source) that employs the penning method as the ion source 101. Inside the penning type ion source, an anode 203 to which a discharge voltage is applied from the power supply unit 110 is arranged between the first cathode 201 and the second cathode 202 having the same potential, and between the anode and the cathode. An electron is generated by the potential difference of. The generated electrons are retained inside the ion source by the permanent magnet 204.
- argon gas is introduced into the ion source from the outside through the pipe 206, and the electrons collide with the argon gas to generate argon ions.
- Argon ions are attracted to the acceleration electrode 205 to which the acceleration voltage is applied, and are irradiated as an ion beam through the ion beam irradiation port 207.
- the ion beam distribution irradiated by the ion source 101 fluctuates.
- wear of the internal parts and adhesion of fine particles of the ion beam irradiation port 207 are eliminated, but it is guaranteed that the ion beam distribution will return to that before the fluctuation. It is not something to do.
- the ion beam distribution is confirmed after the maintenance is performed, and the working distance, the discharge voltage, and the gas flow rate of the ion source 101 are adjusted so that a desired ion beam distribution can be obtained.
- the reproducibility of processing by the ion milling device can be improved.
- FIG. 3 shows a configuration example of the drive unit 107 that drives the ion beam current measuring member 105.
- the figure shows a top view of the drive unit 107 and a cross-sectional view of the ion beam current measuring member 105 and the measuring member holding portion 106 along the line AA of the top view.
- the display of the covering material is omitted.
- the measuring member holding portion 106 is made of an insulating material, and an ion beam current taking out portion 310 having conductivity is provided inside the measuring member holding portion 106.
- the ion beam current measuring member 105 is attached to the ion beam current extraction unit 310 and is connected to the ion beam current extraction wiring 311 via the ion beam current extraction unit 310.
- the ion beam current take-out wiring 311 is connected to the ammeter 113.
- the drive unit 107 includes a motor 301, a bevel gear 302, a gear 303, and a rail member 304.
- the bevel gear 302 and the gear 303 provided on the drive shaft of the motor 301 rotate, and the drive is transmitted to the rail member 304 to reciprocate the measuring member holding portion 106 in the X direction.
- the orbit for reciprocating the measuring member holding portion 106 is located between the ion source 101 and the sample stage 102. It is desirable to position it as close to the sample stage 102 as possible.
- the motor 301 does not need to be provided exclusively for the drive unit 107, and can also be used as the sample stage rotation drive source 103 for rotating the sample stage 102.
- the ion beam current measuring member 105 is in a processed state by being irradiated with an ion beam from the ion source 101 during the measurement of the ion beam current. Since the member is consumed every time the measurement is performed, a member having a low sputtering yield, which is difficult to be processed by ions, is suitable. Further, a linear material is used as the ion beam current measuring member 105, and the ion beam profile is measured by moving the ion beam current measuring member 105 over the unfocused ion beam irradiation range. This means that the diameter of the ion beam current measuring member 105 determines the spatial resolution of the measurable ion distribution.
- the diameter of the ion beam current measuring member 105 is smaller than the half width of the ion beam during processing.
- a graphite carbon linear material having a diameter of 0.2 mm or more and 0.5 mm or less can be used.
- the cross-sectional shape of the ion beam current measuring member 105 is circular.
- tungsten linear material and the like can also be used.
- the ion beam current measuring member 105 is removable from the measuring member holding portion 106, and when the ion beam current measuring member 105 is consumed by the ion beam, it is replaced with a new ion beam current measuring member.
- FIG. 4 is a schematic view showing a state in which the ion beam current is measured without providing the electron trap 112 and the covering material 120 as a comparative example.
- the current that flows when the ion beam current measuring member 105 collides with the positively charged argon ions emitted from the ion source 101 is measured by the current meter 113.
- the current value was measured from the ammeter 113 even though the ion beam current measuring member 105 was moved to a position where the ion beam was not irradiated (first). Task).
- the argon ions collide with the structure near the ion beam current measuring member 105, specifically, the measuring member holding portion 106 and the like to generate secondary electrons and backscattered electrons, and the generated secondary electrons and backscattered electrons are generated.
- the scattered electrons collide with the accelerating electrode 205 of the ion source 101, so that the current value measured by the current meter 113 increases.
- FIG. 5 shows an ion beam profile measured by the comparative example of FIG.
- the horizontal axis represents the beam measurement position
- the vertical axis represents the ion beam current I measured by the ammeter 113.
- the beam measurement position is indicated with the intersection of the orbit of the ion beam current measuring member 105 on the XZ plane and the ion beam center B 0 as the origin.
- the measured ion beam profile 500 includes a true ion beam profile 501 that flows when argon ions collide with the ion beam current measuring member 105 and a background of electrons generated by irradiation of the ion beam. It is the sum of the noise profile 502.
- FIG. 5 shows an ion beam profile measured by the comparative example of FIG.
- the horizontal axis represents the beam measurement position
- the vertical axis represents the ion beam current I measured by the ammeter 113.
- the beam measurement position is indicated with the intersection of the orbit of the ion beam current measuring member 105 on
- the background noise profile 502 is simplified as a constant value, but in reality, the generation variation of secondary electrons and backscattered electrons, and the electrons to the ion beam current measuring member 105 depending on the beam measurement position It takes a value that varies depending on the measurement position due to the difference in the amount of collision.
- the true ion beam profile 501 is thought to follow a Gaussian distribution. Therefore, the measured ion beam current I (x) can be represented by (Equation 1).
- A is the maximum value of the true ion beam profile
- ⁇ is the variance of the true ion beam profile. That is, in order to obtain the information of the true ion beam profile 501, it is necessary to remove the influence of the background noise profile 502 from the measured ion beam profile 500.
- FIG. 5 shows an enlarged waveform 504 of a part 503 of the measured ion beam profile 500.
- the actually measured ion beam profile 500 includes a high-frequency noise waveform. It is possible to obtain a smooth profile waveform (waveform 505) by averaging the measured ion beam current value data, but if the noise component is large, the data required to smooth the ion beam profile. The amount will increase. Therefore, the moving speed of the ion beam current measuring member 105 could not be increased, and the measuring time of the ion beam profile 500 could not be shortened (second problem).
- the ion beam is irradiated from the ion source 101 in an unfocused manner, so that the argon ions are scattered over a wide area of the sample chamber 108.
- the ion beam intensity is low, argon ions collide with each other in a wide range of the inner wall of the sample chamber 108 and the structure in the sample chamber 108, and secondary electrons and backscattered electrons are generated, and the accelerating electrode 205 of the ion source 101 is subjected to. Collision (see FIG. 4). These secondary electrons and backscattered electrons are measured as noise in the ion beam profile waveform.
- FIG. 6A shows a state in which a plate-shaped electron trap 112 and a covering material 120 are provided to measure an ion beam current.
- FIG. 6B shows the positional relationship between the orbit of the ion beam current measuring member 105 (coordinates X0 to X5 indicate positions on the orbit) and the electron trap 112.
- the intensity of the ion beam in the vicinity of the orbit of the ion beam current measuring member 105 is schematically shown by shading.
- the ion beam intensity is set with the ion beam center B 0 as the maximum intensity, and decreases according to the Gaussian distribution toward the periphery.
- the region with high ion beam intensity is displayed as a region with high concentration
- the region with low beam intensity is displayed as a region with low concentration.
- an electron trap 112 to which a positive voltage is applied is provided near the orbit of the ion beam current measuring member 105 to generate secondary electrons. And backscattered electrons are captured.
- the voltage applied to the electronic trap 112 is supplied from the power supply unit 110, and the voltage value is set by the control unit 109 (not shown).
- the positive voltage applied to the electron trap 112 is set as a positive voltage that does not affect the measurement of the ion beam profile.
- the electron trap 112 allows the ion beam current measuring member 105 and the electrons to be seen from the ion source 101. It is arranged so as to overlap with the trap 112. As shown in FIG. 6B, the ion beam intensity of the ion source 101 is highest in the vicinity of the ion beam center B 0, and the amount of secondary electrons and backscattered electrons generated and the energy are large. Therefore, secondary electrons and backscattered electrons generated by arranging the electron trap 112 near the center B 0 of the ion beam can be efficiently captured.
- the electron trap 112 when the electron trap 112 is arranged as shown in FIG. 6A, the electron trap 112 itself may become a source of secondary electrons and backscattered electrons due to collision with argon ions.
- backscattered electrons have high energy and high straightness, so that the amount of electrons reaching the acceleration electrode 205 is also large.
- a light element and a material having a low sputter yield are used for the electron trap 112. Is desirable. Specifically, it is desirable to use graphite carbon.
- the electron trap 112 needs to have a certain area in order to efficiently capture secondary electrons and backscattered electrons, but its size is not limited.
- it can be a circular plate electrode having the half width of the ion beam as the diameter centered on the ion beam center B 0 or a quadrangular plate electrode having one side. Further, as long as electrons can be trapped, not only a plate electrode but also a mesh electrode and other electrodes are allowed.
- the amount of electrons generated by irradiating the covering material 120 with an ion beam having a relatively weak intensity can be reduced, and the noise of the ion beam profile waveform can be reduced. This is due to the following reasons. As described above, the amount of backscattered electrons generated increases as the atomic numbers of the constituent elements to be irradiated increase. By using a material whose main component is an element having an atomic number smaller than that of the material of the structure or inner wall to be coated, the generation of backscattered electrons can be effectively suppressed as the material of the covering material 120.
- the covering material 120 does not necessarily have to cover the entire surface of the structure or the entire wall surface of the sample chamber 108, but it is desirable to cover at least the surface facing the ion source 101. This is because the ion beam has strong straightness, and the amount of secondary electrons and backscattered electrons generated per unit area from the surface facing the ion source 101 is larger than that of the other surfaces.
- Figures 7A to 7B show a modified example of the electronic trap.
- the electron trap is arranged behind the ion beam current measuring member 105 when viewed from the ion source 101, whereas in FIG. 7A, the electron trap is arranged closer to the ion source 101 than the ion beam current measuring member 105.
- 7A shows a side view
- FIG. 7B shows a top view.
- the voltage applied to the electronic trap 700 is also supplied from the power supply unit 110, and the voltage value is set by the control unit 109 (not shown).
- the electron trap 700 is arranged in a region where the ion beam from the ion source 101 is not irradiated, and the generated secondary electrons and backscattered electrons are captured before reaching the acceleration electrode 205.
- the electron trap 700 since the ion beam is not irradiated, a highly conductive material such as copper or phosphor bronze can be used as the electron trap 700.
- the covering material 120 is also provided on the surface of the electron trap 700 (the covering material 120 is omitted in FIG. 7B). Both the electronic trap 112 and the electronic trap 700 may be provided.
- the control unit 109 controls the drive unit 107 and moves the ion beam current measuring member 105 to the origin position.
- the origin position is set so as to be the center of the ion beam irradiation range, but the setting of the origin position is not limited to this.
- the control unit 109 controls the power supply unit 110 and outputs an ion beam from the ion source 101 according to the ion beam irradiation conditions held as the current settings.
- the current setting refers to the ion beam irradiation condition defined as the processing condition of the sample.
- the acceleration voltage, discharge voltage, and gas flow rate of the ion source 101 when processing a sample are defined.
- the control unit 109 controls the power supply unit 110 to the electronic trap 112 (and / or the electronic trap 700) and applies a predetermined voltage.
- the positive voltage applied to the electron trap is set to a voltage within a range that does not adversely affect the measurement of the ion beam profile.
- the control unit 109 controls the drive unit 107 to measure the ion beam current with the ammeter 113 while reciprocating the ion beam current measuring member 105 in the X direction.
- the control unit 109 acquires an ion beam profile by associating the position of the ion beam current measuring member 105 in the X direction with the current value at the position.
- the acquired ion beam profile is displayed on the display unit 111.
- S805 The ion beam profile to be adjusted is read and displayed on the display unit 111. This step may be performed before the acquisition of the ion beam profile (S804).
- S806 Adjust the ion beam irradiation conditions so that the ion beam profile acquired in S804 approximates the target ion beam profile read in S805. Specifically, one or more parameters of the working distance, the discharge voltage, and the gas flow rate of the ion source 101 are adjusted.
- the acceleration voltage is not subject to adjustment. This is because if the acceleration voltage is changed, the processing speed (milling rate) of the sample will change significantly even if the ion beam current is the same.
- S807 Acquire the ion beam profile again according to the adjusted ion beam irradiation conditions.
- the processing in S807 is the same as the processing in S804.
- S808 The ion beam profile acquired in S807 is compared with the target ion beam profile read in S805, and if the desired ion beam profile can be acquired, the process is completed. If not, the ion beam irradiation conditions are adjusted (S806). ) Is repeated.
- the present invention is not limited to the described embodiments and can be variously modified without departing from the gist thereof. ..
- it may function as an electron trap by making it possible to apply a positive potential to a structure that is located in the vicinity of the ion beam current measuring member 105 and does not operate during ion beam profile measurement, for example, a sample stage.
- the ion milling device includes a sample stage position adjusting mechanism capable of moving the sample stage in the Z direction, the working distance may be adjusted by the sample stage position adjusting mechanism.
- the material and the coating method may be different depending on the object to be coated.
- the range covered with the covering material is not limited to the range described as an example.
- the covering material may not be provided.
- a coating material is provided on the entire inner wall of the sample chamber 108 facing the ion source 101 is shown, the region where the ion beam intensity is relatively strong centered on the intersection of the ion beam center B 0 and the inner wall is shown.
- the covering material may be provided only for this.
- the ion beam profile itself may be used as a reference, or the feature amount of the ion beam profile, for example, the peak value and the half price width of the ion beam profile are calculated, and the feature amounts match.
- the ion beam irradiation conditions may be adjusted so as to be performed.
- the display unit 111 may display the feature amount as the adjustment reference instead of displaying the ion beam profile itself.
- 100 Ion milling device, 101: Ion source, 102: Sample stage, 103: Sample stage rotation drive source, 104: Ion source position adjustment mechanism, 105: Ion beam current measuring member, 106: Measuring member holding part, 107: Drive Unit, 108: Sample chamber, 109: Control unit, 110: Power supply unit, 111: Display unit, 112: Electronic trap, 113: Current meter, 120: Coating material, 201: First cathode, 202: Second cathode , 203: Anode, 204: Permanent magnet, 205: Acceleration electrode, 206: Piping, 207: Ion beam irradiation port, 301: Motor, 302: Cathode gear, 303: Gear, 304: Rail member, 310: Ion beam current extraction Part, 311: Ion beam current take-out wiring, 700: Electronic trap.
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Abstract
Description
Claims (13)
- イオン源と、
前記イオン源から非集束のイオンビームを照射することにより加工される試料が載置される試料ステージと、
第1の方向に延在する線状のイオンビーム電流測定部材を保持する測定部材保持部と、
制御部とを有し、
前記測定部材保持部及び前記試料ステージの少なくとも前記イオン源に対向する面を覆うように被覆材が設けられ、
前記被覆材の材料は、前記被覆材が設けられる構造物の材料の元素よりも原子番号の小さな元素を主成分とし、
前記制御部は、前記イオン源と前記試料ステージとの間に位置し、前記第1の方向と直交する第2の方向に延びる軌道上を、前記イオン源から第1の照射条件で前記イオンビームが出力された状態で、前記イオンビーム電流測定部材を前記イオンビームの照射範囲において移動させ、前記イオンビームが前記イオンビーム電流測定部材に照射されることにより前記イオンビーム電流測定部材に流れるイオンビーム電流を測定するイオンミリング装置。 - 請求項1において、
試料室を有し、
前記試料室の前記イオン源に対向する内壁に前記被覆材が設けられるイオンミリング装置。 - 請求項1において、
前記被覆材は炭素を主成分とするイオンミリング装置。 - 請求項1において、
前記軌道の近傍に配置される電極を有し、
前記制御部は、前記電極に所定の正電圧を印加した状態で、前記イオンビーム電流を測定するイオンミリング装置。 - 請求項4において、
前記制御部は、前記イオンビーム電流と当該イオンビーム電流が測定されたときの前記イオンビーム電流測定部材の位置との関係を示すイオンビームプロファイルを計測するイオンミリング装置。 - 請求項5において、
前記制御部は、前記イオンビームプロファイルのピーク値及び半値幅を算出するイオンミリング装置。 - 請求項4において、
前記電極は、前記軌道よりも前記試料ステージ側、かつ前記イオン源からの前記イオンビームのイオンビーム中心と前記イオンビーム電流測定部材とが交わるとき、前記イオン源からみて前記イオンビーム電流測定部材と前記電極とが重なる位置に配置されるイオンミリング装置。 - 請求項4において、
前記電極はグラファイトカーボンであるイオンミリング装置。 - 請求項4において、
前記電極は、前記軌道よりも前記イオン源側、かつ前記イオン源からのイオンビームが照射されない位置に配置されるイオンミリング装置。 - 請求項9において、
前記電極は銅またはリン青銅であり、
前記電極に前記被覆材が設けられるイオンミリング装置。 - 請求項4において、
前記試料ステージを前記電極とするイオンミリング装置。 - 請求項1において、
前記イオンビーム電流測定部材は、断面が円柱形状であり、径が前記イオンビームの半値幅以下であるグラファイトカーボンの線状材であるイオンミリング装置。 - 請求項5において、
試料室と、
前記試料室に設置されるイオン源位置調整機構とを有し、
前記イオン源は前記イオン源位置調整機構を介して前記試料室に取り付けられ、
前記イオン源は、ぺニング型イオン源であり、
前記イオンビームプロファイルに基づき、前記イオン源の放電電圧、前記イオン源のガス流量または作動距離の1つ以上が調整可能なイオンミリング装置。
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JPH085528A (ja) * | 1994-06-23 | 1996-01-12 | Sharp Corp | 透過電子顕微鏡用断面試料作成用集束イオンビーム装置及び透過電子顕微鏡用断面試料作成方法 |
JP2004509436A (ja) * | 2000-09-15 | 2004-03-25 | バリアン・セミコンダクター・エクイップメント・アソシエイツ・インコーポレイテッド | イオン注入用のファラデーシステム |
WO2016017661A1 (ja) * | 2014-07-30 | 2016-02-04 | 株式会社日立ハイテクノロジーズ | イオンミリング装置、イオン源およびイオンミリング方法 |
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JPH085528A (ja) * | 1994-06-23 | 1996-01-12 | Sharp Corp | 透過電子顕微鏡用断面試料作成用集束イオンビーム装置及び透過電子顕微鏡用断面試料作成方法 |
JP2004509436A (ja) * | 2000-09-15 | 2004-03-25 | バリアン・セミコンダクター・エクイップメント・アソシエイツ・インコーポレイテッド | イオン注入用のファラデーシステム |
WO2016017661A1 (ja) * | 2014-07-30 | 2016-02-04 | 株式会社日立ハイテクノロジーズ | イオンミリング装置、イオン源およびイオンミリング方法 |
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