WO2016121080A1 - イオンミリングのマスク位置調整方法、マスク位置を調整できる電子顕微鏡、試料ステージに搭載されるマスク調整装置、およびイオンミリング装置の試料マスク部品 - Google Patents
イオンミリングのマスク位置調整方法、マスク位置を調整できる電子顕微鏡、試料ステージに搭載されるマスク調整装置、およびイオンミリング装置の試料マスク部品 Download PDFInfo
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- WO2016121080A1 WO2016121080A1 PCT/JP2015/052614 JP2015052614W WO2016121080A1 WO 2016121080 A1 WO2016121080 A1 WO 2016121080A1 JP 2015052614 W JP2015052614 W JP 2015052614W WO 2016121080 A1 WO2016121080 A1 WO 2016121080A1
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- mask
- sample
- axis
- electron microscope
- sample stage
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- 238000000992 sputter etching Methods 0.000 title claims abstract description 21
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Images
Classifications
-
- 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 or trimming of electrical components
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
- H01J37/261—Details
-
- 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
-
- 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
- H01J37/31—Electron-beam or ion-beam tubes for localised treatment of objects for cutting or drilling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/04—Means for controlling the discharge
- H01J2237/045—Diaphragms
-
- 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
Definitions
- the present invention relates to an ion milling apparatus for producing an observation sample such as a scanning electron microscope (SEM) or a transmission electron microscope (TEM).
- SEM scanning electron microscope
- TEM transmission electron microscope
- the ion milling apparatus is an apparatus for polishing a surface or a cross section of metal, glass, ceramic, or the like by irradiating an argon ion beam or the like, and observes the surface or cross section of a sample with an electron microscope such as SEM or TEM. Therefore, it is suitable as a pretreatment device.
- the vicinity of the part to be observed is cut using, for example, a diamond cutter or a thread saw, and then the cut surface is mechanically polished and attached to a sample stage for an electron microscope. I was observing the image.
- a soft sample such as a polymer material or aluminum has a problem that the observation surface is crushed or deep scratches remain due to abrasive particles.
- a hard sample such as glass or ceramic has a problem that polishing is difficult.
- the composite material in which a soft material and a hard material are laminated has a problem that cross-section processing is extremely difficult.
- the ion milling apparatus can process a soft sample without losing the shape of the surface, and can polish a hard sample and a composite material, so that a mirror-shaped cross section can be easily obtained. There is.
- One of the sample preparation methods in such an ion milling apparatus is a method called cross-section milling.
- Cross-section milling is a method in which a portion of the ion beam is shielded by a mask (shielding plate) placed on the top of the sample, and the sample cross-section is sputtered along the ridgeline (end face) of the mask. A cross section of the sample can be made.
- Patent Document 1 In International Publication No. 2012/060416 (Patent Document 1), it is disclosed that the mask position is adjusted with an optical microscope.
- Patent Document 2 provides a mask position adjustment mechanism provided with a motor, a battery, and an infrared sensor, and a mask position adjustment mechanism disposed in an electron microscope provided with an infrared ray provided in a sample chamber. It is disclosed to operate via a lamp.
- the inventor of the present application diligently studied to highly accurately perform mask position adjustment for cross-sectional milling with a simple configuration, and as a result, the following knowledge was obtained.
- Patent Document 2 does not have a battery supply means in the electron microscope, and therefore requires a separate charging operation. Even if a solar cell that generates power by infrared rays is provided and the battery is charged by irradiation with infrared rays, a large amount of infrared rays is required to charge the battery to such an extent that motor control is possible.
- An object of the present invention relates to adjusting the mask position with high accuracy while observing with an electron microscope without providing a heat source in the electron microscope.
- the present invention relates to adjusting the mask position by driving the R axis of an electron microscope.
- the electron microscope The mask position can be adjusted with high accuracy while observing.
- the side schematic diagram of the ion milling device which can perform both section milling processing and plane milling processing.
- the upper surface schematic of the ion milling apparatus which can perform both a cross-section milling process and a plane milling process.
- FIG. The block diagram of the sample mask unit 21 main body.
- FIG. The block diagram of the modification of the sample mask unit 21.
- FIG. 4 is an explanatory diagram showing a state before the sample mask unit fine movement mechanism 4 installed in the sample mask unit 21 is fixed on the fixed base 42 or a state where it is removed from the fixed base 42.
- Explanatory drawing which shows the state which fixed the sample mask unit fine movement mechanism 4 on the fixing stand 42.
- FIG. Explanatory drawing of the method of matching the site
- FIG. Explanatory drawing of the method of making the cross section of the sample 3 and the mask 2 parallel.
- a sample mask component capable of adjusting the positional relationship between the sample and the mask is placed on the sample stage of the electron microscope, the mask position adjusting unit of the sample mask component is connected to the R axis of the sample stage, and the R axis is driven.
- a mask position adjustment method for ion milling is disclosed in which the position of the mask can be adjusted, the R axis is driven while observing with an electron microscope, and the position of the mask is adjusted.
- the mask moves along the linear guide by rotating the mask position adjusting unit.
- the mask position adjusting unit and the R axis are connected via a rotating member, and the driving of the R axis is transmitted to the mask position adjusting unit by the rotation of the rotating member.
- the sample mask component is installed in the moving mechanism that rotatably holds the R mechanism in the sample stage.
- the sample stage is driven in the X axis, Y axis, Z axis, and T axis, and raster rotation is performed, the observation screen of the electron microscope is adjusted, and the position of the mask is adjusted.
- the electron microscope is capable of adjusting the mask position of the ion milling apparatus, and includes a sample stage on which a sample mask component capable of adjusting the positional relationship between the sample and the mask is provided, and the sample installed on the sample stage
- a sample mask component capable of adjusting the positional relationship between the sample and the mask
- the sample installed on the sample stage Disclosed is an apparatus in which the R axis of the sample stage is connected to a mask position adjustment unit of a mask component, and the position of the mask can be adjusted by driving the R axis.
- the embodiment discloses an electron microscope that rotates a mask position adjusting member that moves a mask along a linear guide by driving an R axis.
- an electron microscope in which the sample stage includes a rotating member that connects the mask position adjusting unit and the R axis, and the driving of the R axis is transmitted to the mask position adjusting unit by the rotation of the rotating member.
- an electron microscope in which a sample mask part is installed on a moving mechanism that rotatably holds an R mechanism of a sample stage.
- a microscope is disclosed.
- an ion milling mask adjustment device installed on a sample stage of an electron microscope, in which a sample mask component capable of adjusting the positional relationship between the sample and the mask is installed and installed in the mask adjustment device
- a mask position adjusting unit of a sample mask component is connected to the R axis of the sample stage, and the mask position is adjusted by driving the R axis.
- the embodiment discloses a mask adjustment device that rotates a mask position adjustment component that moves a mask along a linear guide by driving an R axis.
- the embodiment discloses a mask adjustment device that includes a rotation member that connects the mask position adjustment unit and the R axis, and transmits the drive of the R axis to the mask position adjustment unit by the rotation of the rotation member.
- the mask adjusting device is installed in a moving mechanism that rotatably holds the R mechanism of the sample stage.
- the embodiment discloses a mask adjusting device that moves by driving the X axis, Y axis, Z axis, and T axis of the sample stage while adjusting the position of the mask by driving the R axis.
- a sample mask part of an ion milling apparatus capable of adjusting the positional relationship between the sample and the mask, and a mask position adjusting component that adjusts the positional relationship between the sample and the mask when installed on the sample stage of the electron microscope.
- a mask position adjusting component that adjusts the positional relationship between the sample and the mask when installed on the sample stage of the electron microscope.
- a sample mask part for moving the mask along the linear guide by rotating the mask position adjusting part is disclosed.
- a sample mask part in which the mask position adjusting unit is connected to the R axis via a rotating member, and the driving of the R axis is transmitted by the rotation of the rotating member.
- the sample mask component is installed in a moving mechanism that rotatably holds the R mechanism of the sample stage.
- the embodiment discloses a sample mask component that moves by driving the X axis, Y axis, Z axis, and T axis of the sample stage while adjusting the position of the mask by driving the R axis.
- an ion milling apparatus that uses an argon ion beam and can selectively perform both cross-sectional milling and planar milling will be described as an example.
- FIG. 1 is a schematic side view of an ion milling apparatus capable of performing both cross-sectional milling and planar milling
- FIG. 2 is a schematic top view thereof.
- the ion milling apparatus of the present embodiment includes a processing observation window 7 on the upper surface of the vacuum chamber 15, a sample stage 8 on the front surface, and an ion source 1 on the left side, and a shutter 101 is provided between the sample 3 and the processing observation window 7. ing.
- the shutter 101 is installed to prevent sputtered particles from accumulating on the processing observation window 7.
- the vacuum chamber 15 has a box shape that forms a space for forming a vacuum atmosphere, but may have a shape conforming to the box shape.
- the processing observation window 7 is provided above the vacuum chamber 15 (in a gravitational environment, the direction opposite to the direction of the gravitational field).
- the ion source 1 is provided on a side wall surface of the vacuum chamber 15 (a surface adjacent to the upper direction of the vacuum chamber 15 and perpendicular to the direction of the gravitational field). That is, the processing observation window 7 is provided on the wall surface of the vacuum chamber 15 in a direction orthogonal to the plane including the tilt axis of the sample stage 8 and the irradiation trajectory of the ion beam irradiated from the ion source 1.
- the ion beam irradiated by the ion source is not limited to an argon ion beam, and may be a krypton ion beam, a xenon ion beam, a gallium ion beam, or the like.
- an optical microscope or an electron microscope may be installed in the opening for the processing observation window 7.
- FIG. 3 is a configuration diagram of a configuration for rotating and tilting the rotating body 9 and a sample stage drawing mechanism.
- the sample unit base 5 is provided with a rotating body 9 on which a sample holding member (member holding the sample including the sample mask unit fine movement mechanism 4) can be placed.
- the rotating body 9 supports the sample holding member. Functions as a support base.
- the sample unit base 5 includes a plurality of gears 50 that transmit a rotational force from the outside of the flange 10 to the rotator 9, and a plurality of bearings 51 that rotatably support the rotator 9.
- the sample mask unit fine movement mechanism 4 is provided with a mask unit fixing portion 52 (including screws) on the bottom surface thereof.
- the sample mask unit fine movement mechanism 4 is mounted on the sample unit base 5 by bringing its bottom surface into contact with the upper surface of the rotating body 9 of the sample unit base 5 and screw-fixing to the rotating body 9 via the mask unit fixing portion 52.
- the rotating body 9 mounted on the sample unit base 5 is configured so as to be able to rotate and tilt at an arbitrary angle with respect to the optical axis of the ion beam irradiated from the ion source 1 from the side surface direction of the vacuum chamber 15. The direction and angle of inclination are controlled by the sample stage 8.
- FIG. 4 is a configuration diagram of a configuration for rotating and tilting the rotating body 9 and a modified example of the sample stage drawing mechanism.
- a method of rotating and tilting the rotating body 9 of the sample unit base 5 as shown in FIG. 3, a plurality of gears 50 and shafts are provided on the sample unit base 5, and a rotating shaft (sample stage) disposed inside the sample unit base 5 is used.
- a shaft coupling 53 connected to the gear 50 of the sample unit base 5 is provided, and the rotation axis (sample stage 8) provided on the flange 10 is provided.
- a method of rotating a rotating shaft different from that of the other shaft may be used.
- the sample 3 installed on the sample mask unit fine movement mechanism 4 can be set at a predetermined angle with respect to the optical axis of the ion beam. Furthermore, the rotation axis of the rotating body 9 of the sample unit base 5 and the position of the upper surface of the sample (the lower surface of the mask) can be matched to produce an efficient smooth processed surface.
- the sample mask unit fine movement mechanism 4 is configured to be movable in the front-rear and left-right directions in the direction perpendicular to the optical axis of the ion beam, that is, in the X direction and the Y direction in FIGS.
- the sample unit base 5 is arranged via a sample stage 8 (rotation mechanism) mounted on a flange 10 that also serves as a part of the container wall of the vacuum chamber 15, and the flange 10 is pulled out along the linear guide 11.
- a sample stage 8 rotation mechanism
- the sample unit base 5 is configured to be pulled out of the vacuum chamber 15. In this way, the sample stage drawing mechanism is configured.
- FIG. 5 is a configuration diagram of the sample stage drawing mechanism 60.
- the sample stage drawing mechanism 60 includes a linear guide 11 and a flange 10 fixed to the linear guide 11.
- the sample unit base 5 fixed to the sample stage 8 mounted on the flange 10 is pulled out from the vacuum chamber 15 along the linear guide 11 by pulling out the flange 10 along the linear guide 11.
- the installed sample holder 23 and the sample 3 installed in the sample holder 23 are drawn out from the vacuum chamber 15 integrally.
- the sample mask unit fine movement mechanism 4 provided with the sample mask unit 21 has a configuration that is detachably fixed to the sample unit base 5. Therefore, when the sample mask unit fine movement mechanism 4 provided with the sample mask unit 21 is pulled out of the vacuum chamber 15, the sample mask unit fine movement mechanism 4 is brought into a detachable state from the sample unit base 5 (detachment standby of the sample mask unit 21).
- FIG. 5 shows a state in which the sample mask unit fine movement mechanism 4 provided with the sample mask unit 21 is detached from the sample unit base 5 outside the vacuum chamber 15 from such a detachable state. This attachment / detachment is performed manually or with an appropriate instrument.
- FIG. 6 is a configuration diagram of the main body of the sample mask unit 21.
- a sample mask unit 21 main body
- the sample holder 23 includes a sample holder rotation ring 22 and a sample holder rotation screw 28 as a rotation mechanism, and can rotate vertically with respect to the optical axis of the ion beam.
- the sample holder rotating ring 22 is configured to rotate by turning the sample holder rotating screw 28, and returns to the position before rotation by reversely rotating with the spring pressure of the spring 29 compressed by this rotation. It has become.
- the sample mask unit 21 has a mechanism that can be attached to and detached from the sample mask unit fine movement mechanism 4 and a mechanism that can finely adjust the position and rotation angle of the mask 2.
- a mechanism that can be attached to and detached from the sample mask unit fine movement mechanism 4 and a mechanism that can finely adjust the position and rotation angle of the mask 2.
- the sample mask unit 21 and the sample mask unit fine movement mechanism 4 are two parts will be described.
- the sample mask unit 21 and the sample mask fine movement mechanism 4 may be composed of one part.
- the unit fine movement mechanism will be described separately).
- the mask 2 is fixed to the mask holder 25 with a mask fixing screw 27.
- the mask holder 25 is moved along the linear guide 24 by operating the mask fine adjustment mechanism 26 (mask position adjusting unit), and the mask 2 is also moved along with this movement, whereby the sample 3 and the mask 2 are moved.
- the relative positional relationship (shielding positional relationship) is finely adjusted.
- a micrometer may be used for the mask fine adjustment mechanism 26.
- FIG. 7 is a configuration diagram of the sample holder 23 and the sample holder rotating ring 22.
- the outside of the sample holder rotating ring 22 has a circular arc shape, and the inside thereof has a shape that can be fitted to the sample holder 23.
- the sample holder 23 is inserted into the sample holder rotating ring 22 from the lower side opposite to the upper side for fixing the sample, and is fixed to the sample holder rotating ring 22 with screws.
- the sample 3 adhered and fixed to the sample holder 23 is closely attached and fixed to the mask 2 after the relative position between the sample 3 and the mask 2 is finely adjusted.
- FIG. 8 and 9 are configuration diagrams of a modification of the sample mask unit 21.
- FIG. FIG. 8 shows a state in which the sample holder 23 to which the sample 3 is fixed is mounted in the sample mask unit 21, and
- FIG. 9 shows a state in which the sample holder 23 to which the sample 3 is fixed is removed from the sample mask unit 21.
- the sample holder 23 to which the sample 3 is bonded and fixed can be mounted in the sample mask unit 21 by the sample 3 coming into contact with the mask 2 from the back surface of the sample mask unit 21 through the hole provided in the sample holder rotating ring 22. Become.
- the sample holder 23 to which the sample 3 is bonded and fixed is fixed by a sample holder fixing bracket 35.
- This fixing is performed by inserting a hexagon wrench or the like into the sample holder fixing mechanism 36, rotating it, and moving the sample holder fitting 35.
- the mask fine adjustment mechanism 26 can finely adjust the relative position between the mask 2 fixed to the mask holder 25 and the sample 3 adhered and fixed to the sample holder 23 by finely adjusting the position of the mask holder 25. .
- FIG. 10 is an explanatory diagram showing a state before the sample mask unit fine movement mechanism 4 installed in the sample mask unit 21 is fixed on the fixing base 42 or a state where it is removed from the fixing base 42.
- FIG. 11 is an explanatory view showing a state in which the sample mask unit fine movement mechanism 4 is fixed on the fixing base 42.
- the sample mask unit fine movement mechanism 4 provided with the sample mask unit 21 is removed from the sample unit base 5 (FIG. 10) and mounted on the fixed base 42 of the optical microscope 40 ( 11), the shielding positional relationship of the mask 2 with respect to the sample 3 is adjusted.
- the optical microscope 40 for observing the shielding positional relationship between the mask 2 and the sample 3 is configured separately from the vacuum chamber 15 and can be arranged at an arbitrary location.
- the optical microscope 40 is for installing the sample mask unit fine movement mechanism 4 on which the well-known loupe 12, the loupe fine movement mechanism 13, the observation table 41, and the removed sample mask unit 21 are installed on the observation table 41.
- a fixed base 42 has a positioning shaft and a hole. Then, the sample mask unit fine movement mechanism 4 provided with the sample mask unit 21 is installed at a fixed position on the fixed base 42 having reproducibility by a positioning shaft and a hole.
- FIG. 12 is an explanatory diagram of a method for aligning the portion of the sample 3 whose cross section is to be polished with the ion beam center 98.
- a trace made by irradiating an ion beam with a photosensitive paper or the like attached to the sample holder 23 (ie, the center of the beam) and the center of the loupe are driven in the directions X2 and Y2 in FIG. Move to match.
- the sample mask unit fine movement mechanism 4 in which the sample mask unit main body 21 after the sample 3 is installed is installed on the fixed base 42 as shown in FIG.
- the ion beam center 98 and the portion to be polished (hereinafter referred to as a processing object) are aligned. be able to.
- FIG. 13 is an explanatory diagram of a method for making the cross section of the sample 3 and the mask 2 parallel to each other.
- the sample holder rotating screw 28 is rotated to adjust the position in the X1 direction of FIG. 14 so that the cross section of the sample 3 and the ridge line of the mask 2 are parallel.
- the mask fine adjustment mechanism 26 is rotated and set so that the center of the object to be processed and the ridge line of the mask 2 are aligned. (At this time, if there is no object to be processed and a cross section of the sample 3 is desired, the sample 3 is slightly more than the mask 2. (For example, the mask fine adjustment mechanism 26 is set so that the sample 3 protrudes about 50 ⁇ m from the mask 2).
- the sample mask unit fine movement mechanism 4 provided with the sample mask unit 21 is detached from the sample unit base 5 and mounted on the fixed base 42 of the optical microscope 40. Then, the masking position relationship of the mask 2 with respect to the sample 3 is adjusted by the mask position adjusting unit (mask fine adjusting mechanism 26).
- FIG. 14 is an explanatory diagram of a modified example of the method of installing the sample mask unit fine movement mechanism 4 on the optical microscope 40.
- the optical microscope 40 may be installed by a method using the lower surface of the sample mask unit fine movement mechanism 4 without using the sample mask unit 21 or the mask unit fixing portion 52 to the sample unit base 5 of the sample mask unit fine movement mechanism 4. good.
- loupe fine movement mechanism 13 for adjusting the beam center and the loupe center is performed on the fixed base 42 side, and the other operations are the same.
- sample mask unit fine movement mechanism 4 in which the sample mask unit 21 is installed will be described from a state where it is detached from the sample unit base 5 and mounted on the fixed base 42 of the optical microscope 40.
- FIG. 15 is an explanatory diagram of an adjustment method using an optical microscope before fine adjustment by an electron microscope.
- the loupe center and the ion beam center have already been adjusted.
- the position of the processing object 100 of about several ⁇ m that can be seen as a point with the loupe is adjusted in the X3 and Y3 directions of FIG.
- the sample holder rotating screw 28 is rotated to adjust the position in the X1 direction of FIG. 13, and the cross section of the sample 3 and the ridge line of the mask 2 are parallel. (If the workpieces are arranged side by side, the edge lines of the mask 2 are matched with them).
- the positional relationship between the processing object 100 and the ridgeline of the mask 2 is desirably adjusted to 25 ⁇ m or less by turning the mask fine adjustment mechanism 26 (because it is easy to adjust under the electron microscope thereafter). After the adjustment so far, the sample mask unit fine movement mechanism 4 on which the sample mask unit 21 is installed is removed from the fixing base 42 of the optical microscope 40 and mounted on the sample stage of the electron microscope.
- FIG. 16 is an explanatory diagram of the principle of an electron microscope.
- the electron source may be a LaB 6 electron source, a field emission electron source, or a Schottky electron source.
- the inside of the electron microscope is evacuated, and a high pressure is applied to the electron source 70 when the target vacuum pressure is reached.
- An electron beam 71 is emitted from the electron source 70 to which a high voltage is applied.
- the emitted electron beam 71 is focused by the electric potential of the Wehnelt electrode 72, and the trajectory is bent, so that a first crossover 74 is formed between the Wehnelt electrode 72 and the anode electrode 73.
- the electron beam 71 accelerated by the acceleration voltage passes through the anode electrode 73 and receives a focusing action by the first focusing lens 75 (electromagnetic coil type), and the first focusing lens 75 and the second focusing lens 76 (electromagnetic coil).
- a second crossover 77 is made between the mold).
- a third crossover 78 is formed between the second focusing lens 76 and the objective lens 81.
- the electron beam 71 is focused by the objective lens 81, is limited by the objective aperture 80, and is irradiated on the surface of the sample 79 (however, the objective aperture is not necessarily the main position).
- the electron beam 71 irradiated on the surface of the sample 79 on the sample stage generates reflected electrons that bounce off the sample surface and secondary electrons that jump out of the sample surface. These reflected electrons and secondary electrons are captured by a detector installed in the sample chamber. The signal from the detector passes through an amplifier circuit, is further converted into a digital signal, and is sent to a display to be displayed as an image of the sample surface.
- the sample stage of an electron microscope is generally driven by five axes (X, Y, Z, T, R), and can control the three-dimensional position, tilt, and rotation of front, rear, left, right, and up.
- the T mechanism that is driven in the T-axis direction is arranged on the Z mechanism that is driven in the Z-axis direction, and similarly, a sample stage having a configuration in which the Y mechanism, the X mechanism, and the R mechanism are arranged in this order is taken as an example. explain. However, it is not limited to this configuration. For example, a configuration in which the Z mechanism is disposed on the T mechanism, a configuration in which the Y mechanism is disposed on the X mechanism, or a 6-axis drive configuration including two T mechanisms may be used.
- FIG. 17 is a schematic top view of a sample stage of an electron microscope.
- the R mechanism 111 disposed at the top of the sample stage of the electron microscope, the X mechanism 110 disposed below the R mechanism 111, and the like are shown.
- the four positioning holes 112 provided in the X mechanism 110 are for determining the position of the mask adjustment unit base 116 used when the sample mask unit fine movement mechanism 4 is mounted on the electron microscope.
- the R mechanism 111 disposed on the X mechanism 110 so as to be rotatable (R-axis drive) rotates (R-axis drive) when the R drive shaft 113 and the R drive gear 114 rotate.
- the R drive shaft 113 of the sample stage according to the present embodiment is provided with a mask adjustment gear 115 for driving the mask fine adjustment mechanism 26.
- FIG. 18 is a schematic top view of the mask adjustment unit base 116 installed on the sample stage.
- the sample is mounted on the R mechanism 111 that is the highest level mechanism of the sample stage.
- the sample mask unit fine movement mechanism 4 in which the sample mask unit 21 is installed is mounted on the mask adjustment unit base 116 installed in the X mechanism 110 as shown in FIG.
- the mask adjustment unit base 116 is provided with an installation hole 117 for exposing a part of the R mechanism 111, so that normal observation is possible even when the mask adjustment unit base 116 is installed.
- the mask adjustment base 116 may be integrated into the sample stage.
- FIG. 19 is a schematic top view of the sample mask fine movement mechanism 4 mounted on the mask adjustment unit base 116 (sample stage), and FIG. 20 is a schematic side view thereof.
- the mask adjustment unit base 116 is provided with a mask adjustment gear unit 118 in which three gears having the same diameter are arranged in a straight line.
- the gear configuration (quantity, arrangement, type) is determined by the positional relationship between the mask adjustment gear 115 and the mask fine adjustment mechanism 26, and is not limited to this configuration. For example, the gears may not have the same diameter.
- the lower gear of the mask adjustment gear unit 118 is connected to the mask adjustment gear 115.
- the mask adjustment gear unit 118 can move the other end in a circular arc shape around the axis center of the lower gear. In this embodiment, when the mask adjustment gear unit 118 is made substantially vertical, the upper gear comes into contact with the mask fine adjustment gear 120 attached to the mask fine adjustment mechanism 26.
- the positional relationship between the mask adjustment gear unit 118 and the mask fine adjustment gear 120 is not limited to this.
- the mask adjustment gear unit 118 can move the other end in an arc shape around the axis center of the lower gear to a position where it comes into contact with the mask fine adjustment gear 120.
- the contact portion between the mask fine adjustment gear 120 and the mask adjustment gear unit 118 is pressed and connected by the restoring force of the compression spring 119 connected to the mask adjustment gear unit 118 and the mask adjustment unit base 116.
- the rotation of the R drive shaft 113 is transmitted to the mask adjustment gear 115, the mask adjustment gear unit 118, and the mask fine adjustment gear 120, and the mask fine adjustment mechanism 26 is rotated.
- the position of the mask 2 can be controlled by the rotation of the R drive shaft 113. Further, by driving four axes (X, Y, Z, T) other than the R axis, the sample mask fine movement mechanism 4 mounted on the mask adjustment unit base 116 (sample stage) is moved to the four axes (X, Y) other than the R axis. , Z, T), the position can be controlled. Note that R-axis position control can be substituted by raster rotation in which the field of view is rotated by rotation in the electron beam scanning direction.
- FIG. 21 is a schematic top view of a modification of the sample mask fine movement mechanism 4 mounted on the mask adjustment unit base 116 (sample stage).
- the connection between the mask fine adjustment mechanism 26 and the R drive shaft is left without adding the mask fine adjustment gear 120 or the like to the mask fine adjustment mechanism 26, and a rubber washer 121 provided on the upper gear of the mask adjustment gear unit 118 is provided. It is in contact.
- a flexible rotating part such as an O-ring may be used.
- the positional relationship between the sample 3 and the mask 2 is finely adjusted using an electron microscope, the vicinity of the processing target 100 is observed with the electron microscope, but the processing target 100 is the center of the display screen at the initial observation position. It is desirable to adjust the arrangement relationship of the sample mask unit fine movement mechanism 4 on which the sample stage, the mask adjustment unit base 116, and the sample mask unit 21 are installed so as to be close to the position. In addition, when each member cannot be arrange
- FIG. 22 is an observation view with an electron microscope (before fine adjustment).
- a processing object 100 that can only be seen as a point by observation with the optical microscope 40 can be clearly confirmed at an appropriate magnification when observed with an electron microscope.
- the sample stage is moved so that the center of the processing object 100 becomes the center of the display screen.
- FIG. 23 is an observation view with an electron microscope (the ridgeline is tilted).
- the ridgeline 99 of the mask 2 is inclined and difficult to adjust, rotation correction is performed by raster rotation.
- the R mechanism 111 of the sample stage is driven to finely adjust the position of the mask 2.
- the motor of the R mechanism 111 is driven, the R drive shaft 113 rotates and the R mechanism 111 rotates.
- the object 100 to be observed (sample 3) is placed on the X mechanism 110. Does not rotate.
- the rotation of the R drive shaft 113 rotates the gear of the mask adjustment gear unit 118 and the mask fine adjustment gear 120 to drive the mask fine adjustment mechanism 26 of the sample mask unit 21. Therefore, the ridgeline 99 of the mask 2 can be aligned with the center of the processing target 100 by moving the ridgeline 99 of the mask 2 while observing the processing target 100 with an electron microscope.
- FIG. 24 is an observation view (after fine adjustment) using an electron microscope.
- the position of the mask 2 can be adjusted (the ridgeline 99 of the mask 2 comes to the center of the workpiece 100)
- the fine adjustment is completed by stopping the driving of the motor.
- the ridgeline 99 of the mask 2 is arranged at the center of the processing object 100 of several ⁇ m or less, and the lower half of the processing object 100 is hidden by the mask 2.
- the vacuum sample chamber of the electron microscope is opened to the atmosphere, and the mask adjustment gear unit 118 is pushed rightward in FIG. 20 so as to be separated from the mask fine adjustment gear 120, and the electron microscope sample stage (mask adjustment unit base 116), the sample mask unit fine movement mechanism 4 can be removed. Then, the sample mask unit fine movement mechanism 4 on which the sample mask unit 21 provided with the mask 2 having the mask 2 with the high-precision shielding position relationship with respect to the sample 3 is removed and mounted on the sample unit base 5 of the ion milling apparatus. After the sample unit base 5 is pushed back into the vacuum chamber 15, the inside of the vacuum chamber 15 is evacuated, and the rotary body 9 is reciprocally inclined while the sample unit base 5 is maintained in a horizontal state to perform cross-section milling. .
- FIG. 25 is an explanatory diagram of a method (cross-section milling) for producing an observation cross section on the sample 3 (processing object 100) using an ion beam apparatus.
- the sample 3 (processing object 100) not covered with the mask 2 is removed in the depth direction along the mask 2.
- the surface of the cross section of the sample 3 (processing target portion 100) can be mirror-polished. Thereby, an observation cross section can be formed in the center of the processing object 100 of several micrometers or less.
- the cross section of a minute object to be processed of ⁇ m or less can be milled over a wide range.
- TSV Si through electrode
- Cross-section milling can be performed on processing objects of ⁇ m or less.
- the protrusion amount (the amount of the sample 3 protruding from the mask 2) is reduced. Since the adjustment can be made at several ⁇ m or less, the processing time can be greatly reduced.
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Abstract
Description
Claims (20)
- イオンミリングのマスク位置調整方法であって、
試料とマスクの位置関係を調整できる試料マスク部品を、電子顕微鏡の試料ステージに設置し、
前記試料マスク部品のマスク位置調整部と、前記試料ステージのR軸を連結し、R軸の駆動により前記マスクの位置を調整できるようにし、
電子顕微鏡で観察しながら、前記R軸を駆動させ、前記マスクの位置を調整することを特徴とするマスク位置調整方法。
- 請求項1記載のマスク位置調整方法において、
マスク位置調整部が回転することにより、リニアガイドに沿って前記マスクが移動することを特徴とするマスク位置調整方法。
- 請求項1記載のマスク位置調整方法において、
前記マスク位置調整部と前記R軸とを回転部材を介して連結し、当該回転部材の回転により前記R軸の駆動を前記マスク位置調整部に伝達することを特徴とするマスク位置調整方法。
- 請求項1記載のマスク位置調整方法において、
前記試料ステージにおける、R機構を回転可能に保持する移動機構に、前記試料マスク部品を設置することを特徴とするマスク位置調整方法。
- 請求項1記載のマスク位置調整方法において、
前記試料ステージをX軸、Y軸、Z軸、およびT軸駆動し、ならびにラスターローテーションし、電子顕微鏡の観察画面を調整して、前記マスクの位置を調整することを特徴とするマスク位置調整方法。
- イオンミリング装置のマスク位置を調整できる電子顕微鏡であって、
試料とマスクの位置関係を調整できる試料マスク部品が設置される試料ステージを備え、当該試料ステージに設置された前記試料マスク部品のマスク位置調整部に、当該試料ステージのR軸を連結し、当該R軸の駆動により前記マスクの位置を調整できることを特徴とする電子顕微鏡。
- 請求項6記載の電子顕微鏡において、
前記マスクをリニアガイドに沿って移動させるマスク位置調整部材をR軸の駆動により回転させることを特徴とする電子顕微鏡。
- 請求項6記載の電子顕微鏡において、
前記試料ステージが、前記マスク位置調整部と前記R軸を連結させる回転部材を備え、当該回転部材の回転により前記R軸の駆動を前記マスク位置調整部に伝達することを特徴とする電子顕微鏡。
- 請求項6記載の電子顕微鏡において、
前記試料ステージの、R機構を回転可能に保持する移動機構に、前記試料マスク部品を設置することを特徴とする電子顕微鏡。
- 請求項6記載の電子顕微鏡において、
前記R軸の駆動により前記マスクの位置を調整しつつ、前記試料ステージのX軸、Y軸、Z軸、およびT軸駆動、ならびに前記電子顕微鏡のラスターローテーションにより、電子顕微鏡の観察画面を調整できることを特徴とする電子顕微鏡。
- 電子顕微鏡の試料ステージに設置される、イオンミリングのマスク調整装置であって、 試料とマスクの位置関係を調整できる試料マスク部品が設置され、
当該マスク調整装置に設置された前記試料マスク部品のマスク位置調整部を、当該試料ステージのR軸に連結させ、当該R軸の駆動により前記マスクの位置を調整させることを特徴とするマスク調整装置。
- 請求項11記載のマスク調整装置であって、
前記マスクをリニアガイドに沿って移動させるマスク位置調整部品をR軸の駆動により回転させることを特徴とするマスク調整装置。
- 請求項11記載のマスク調整装置であって、
前記マスク位置調整部と前記R軸を連結させる回転部材を備え、当該回転部材の回転により前記R軸の駆動を前記マスク位置調整部に伝達することを特徴とするマスク調整装置。
- 請求項11記載のマスク調整装置であって、
当該マスク調整装置が、前記試料ステージの、R機構を回転可能に保持する移動機構に設置されることを特徴とするマスク調整装置。
- 請求項11記載のマスク調整装置であって、
前記R軸の駆動により前記マスクの位置を調整しつつ、前記試料ステージのX軸、Y軸、Z軸、およびT軸駆動により、移動することを特徴とするマスク調整装置。
- 試料とマスクの位置関係を調整できるイオンミリング装置の試料マスク部品であって、 電子顕微鏡の試料ステージに設置されると、試料とマスクの位置関係を調整するマスク位置調整部品が、前記試料ステージのR軸に連結され、当該R軸の駆動により前記マスクの位置を調整することを特徴とする試料マスク部品。
- 請求項16記載の試料マスク部品であって、
前記マスク位置調整部品の回転により、前記マスクをリニアガイドに沿って移動させることを特徴とする試料マスク部品。
- 請求項16記載の試料マスク部品であって、
前記マスク位置調整部が、回転部材を介してR軸と連結され、前記R軸の駆動が、前記回転部材の回転により伝達されることを特徴とする試料マスク部品。
- 請求項16記載の試料マスク部品であって、
当該試料マスク部品が、前記試料ステージの、R機構を回転可能に保持する移動機構に設置されることを特徴とする試料マスク部品。
- 請求項16記載の試料マスク部品であって、
前記R軸の駆動により前記マスクの位置を調整しつつ、前記試料ステージのX軸、Y軸、Z軸、およびT軸駆動により、移動することを特徴とする試料マスク部品。
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DE112015005875.3T DE112015005875B4 (de) | 2015-01-30 | 2015-01-30 | Maskenpositionseinstellverfahren zum ionenfräsen, elektronenmikroskop zum einstellen der maskenposition, auf probenbühne montierte maskeneinstellvorrichtung und probenmaskenkomponente einer ionenfräsvorrichtung |
US15/547,315 US10269534B2 (en) | 2015-01-30 | 2015-01-30 | Mask position adjustment method of ion milling, electron microscope capable of adjusting mask position, mask adjustment device mounted on sample stage and sample mask component of ion milling device |
JP2016571620A JP6427601B2 (ja) | 2015-01-30 | 2015-01-30 | イオンミリングのマスク位置調整方法、電子顕微鏡およびマスク調整装置 |
PCT/JP2015/052614 WO2016121080A1 (ja) | 2015-01-30 | 2015-01-30 | イオンミリングのマスク位置調整方法、マスク位置を調整できる電子顕微鏡、試料ステージに搭載されるマスク調整装置、およびイオンミリング装置の試料マスク部品 |
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