WO2021130805A1 - 荷電粒子線装置 - Google Patents
荷電粒子線装置 Download PDFInfo
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- WO2021130805A1 WO2021130805A1 PCT/JP2019/050279 JP2019050279W WO2021130805A1 WO 2021130805 A1 WO2021130805 A1 WO 2021130805A1 JP 2019050279 W JP2019050279 W JP 2019050279W WO 2021130805 A1 WO2021130805 A1 WO 2021130805A1
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- foreign matter
- charged particle
- particle beam
- matter collecting
- 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
- H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/20—Means for supporting or positioning the objects or the material; Means for adjusting diaphragms or lenses associated with the support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/10—Lenses
- H01J37/12—Lenses electrostatic
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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
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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
- H01J2237/022—Avoiding or removing foreign or contaminating particles, debris or deposits on sample or tube
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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
- H01J2237/18—Vacuum control means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
- H01J37/28—Electron or ion microscopes; Electron or ion diffraction tubes with scanning beams
Definitions
- the present invention relates to a charged particle beam device, and particularly relates to a technique for recovering foreign substances generated in a manufacturing process of a semiconductor device.
- Charged particle beam devices such as electron microscopes and ion microscopes are used for observing various samples with fine structures. Especially in the manufacturing process of semiconductor devices, they are used for dimensional measurement and defect inspection of patterns formed on semiconductor wafers. It will be used. In order to maintain the yield of semiconductor devices, it is necessary to collect foreign substances generated in the manufacturing process.
- Patent Document 1 a foreign matter collecting portion having a mesh electrode inside is positioned under the objective lens to which foreign matter is attached, and a potential difference is generated between the foreign matter collecting portion and the objective lens to attach the foreign matter to the objective lens. It is disclosed that the foreign matter to be dropped is dropped and collected by the foreign matter collecting unit.
- Patent Document 1 consideration is not given to the foreign matter collected in the foreign matter collecting section being scattered from the foreign matter collecting section. That is, when the foreign matter is dropped onto the container-shaped foreign matter collecting portion, the foreign matter colliding with the inner wall surface of the foreign matter collecting portion may be scattered, and the scattered foreign matter lowers the yield of the semiconductor device.
- an object of the present invention is to provide a charged particle beam device capable of reducing the scattering of recovered foreign matter.
- the present invention is a charged particle beam apparatus including a sample chamber in which a sample is arranged and a charged particle beam source for irradiating the sample with a charged particle beam, and a foreign matter desorbing portion on which foreign matter is desorbed.
- a foreign matter collecting unit is further provided in the sample chamber to collect the foreign matter falling from the foreign matter desorbing portion, and an opening through which the foreign matter passes is provided at the upper end portion of the foreign matter collecting portion.
- the area is smaller than the horizontal cross-sectional area of the internal space of the foreign matter collecting portion.
- the present invention is a charged particle beam apparatus including a sample chamber in which a sample is arranged and a charged particle beam source for irradiating the sample with a charged particle beam. It is further provided with a foreign matter collecting portion which is provided and collects foreign matter falling from the foreign matter desorbing portion, and the bottom surface of the foreign matter collecting portion has an inclined surface.
- the present invention is a charged particle beam device including a sample chamber in which a sample is arranged and a charged particle beam source for irradiating the sample with a charged particle beam. It is further provided with a foreign matter collecting portion that is provided and collects foreign matter that falls from the foreign matter removing portion, and at least a part of the inner wall surface of the foreign matter collecting portion is a mirror surface or a surface of a material different from the foreign matter collecting portion. And.
- the charged particle beam device is a device for observing and processing a sample by irradiating the sample with a charged particle beam, and there are various devices such as a scanning electron microscope, a scanning ion microscope, and a scanning transmission electron microscope.
- a scanning electron microscope for observing a sample using an electron beam, which is one of the charged particle beams, will be described.
- the vertical direction in FIG. 1 is the Z direction
- the horizontal direction is the X direction and the Y direction.
- an electron gun 101 Inside the housing 110 of the scanning electron microscope, an electron gun 101, a first condenser lens 102, an aperture 103, a second condenser lens 104, a detector 105, a scanning deflector 106, an objective lens 107, a shield electrode 108, and a sample stage 109, a foreign matter collecting unit 122 is installed. A sample for observation, inspection, and measurement is held on the sample stage 109.
- the electron beam emitted from the electron gun 101 passes through the first condenser lens 102, the diaphragm 103, the second condenser lens 104, the scanning deflector 106, the objective lens 107, the shield electrode 108, and the like, and is deflected and focused on the sample stage.
- the measurement position of the sample on 109 is irradiated.
- the housing 110 includes a sample chamber in which the sample stage 109 is installed, and the sample chamber is exhausted by a vacuum pump (not shown).
- the operations of the electron gun 101, the first condenser lens 102, the aperture 103, the second condenser lens 104, the scanning deflector 106, the objective lens 107, the shield electrode 108, the sample stage 109, and the like are controlled by the control unit 111.
- Charged particles such as secondary electrons and backscattered electrons emitted from the sample by irradiation with an electron beam are detected by the detector 105.
- the detector 105 outputs a detection signal of charged particles to the control unit 111.
- the control unit 111 forms an image of the sample based on the detection signal, displays it on the display unit included in the input / output unit 112, or stores it in the storage unit 113.
- the display unit may be arranged as a separate body separated from the input / output unit 112. The formed image is used for measurement such as sample dimensional measurement and defect inspection.
- the foreign matter collecting unit 122 is a container for collecting foreign matter that hinders the observation of the sample, and is provided in the sample chamber, for example, on the sample stage 109.
- the foreign matter existing in the sample chamber is once adhered to the foreign matter attachment / detachment portion such as the objective lens 107 prior to observing the sample, and then dropped and collected by the foreign matter collection portion 122 that has moved under the foreign matter attachment / detachment portion. ..
- the foreign matter attachment / detachment portion is a member to which foreign matter is attached / detached by an electric field or a magnetic field, and is not limited to the objective lens 107.
- the foreign matter that is detached from the foreign matter desorption part and falls to the foreign matter collecting part 122 may collide with the bottom surface or the side surface which is the inner wall surface of the foreign matter collecting part 122 and may be scattered from the foreign matter collecting part 122. It interferes with sample observation. Therefore, in order to reduce the scattering of foreign matter collected by the foreign matter collecting portion 122, the area of the opening provided at the upper end portion of the foreign matter collecting portion 122 through which the foreign matter passes is determined from the horizontal cross-sectional area of the internal space of the foreign matter collecting portion 122. Also make it smaller.
- FIG. 2 is a cross-sectional view of a foreign matter collecting portion 122 arranged under the objective lens 107 that functions as a foreign matter attaching / detaching portion.
- a lid 201 having a hole 202 through which foreign matter passes is attached to the upper end of the foreign matter collecting portion 122 of this embodiment.
- the area of the hole 202 is smaller than the horizontal cross-sectional area of the internal space of the foreign matter collecting portion 122.
- the bottom surface of the foreign matter collecting unit 122 may be composed of a sample stage 109 or a sample chamber.
- the foreign matter that falls from the objective lens 107 bounces off the bottom surface of the foreign matter collecting portion 122, and tries to scatter out of the foreign matter collecting portion 122 collides with the lower surface of the lid 201. Then, the foreign matter that collides with the lower surface of the lid 201 decelerates while repeatedly colliding with the side surface and the bottom surface of the foreign matter collecting portion 122 and the lower surface of the lid 201, and stays in the internal space of the foreign matter collecting portion 122.
- the foreign matter collecting portion 122 including the lid 201 and the foreign matter desorbing portion are conductive members, and different voltages can be applied to the foreign matter collecting portion 122 and the foreign matter desorbing portion. According to such a configuration, an electric field can be formed between the foreign matter collecting portion 122 and the foreign matter desorbing portion, so that the foreign matter can be easily detached from the foreign matter desorbing portion and the foreign matter can be easily collected by the foreign matter collecting portion 122.
- the foreign matter collecting portion 122 including the lid 201 preferably has a shape symmetrical with respect to the vertical axis.
- the lid 201 preferably has an annular shape
- the foreign matter collecting portion 122 has a cylindrical shape having a bottom surface.
- the foreign matter collecting portion 122 Since the foreign matter collecting portion 122 has a symmetrical shape with respect to the vertical axis, the electric field formed between the foreign matter collecting portion 122 and the foreign matter desorbing portion becomes uniform, and the foreign matter collecting rate by the foreign matter collecting portion 122 can be made uniform. ..
- the objective lens 107 functions as a foreign matter attachment / detachment portion
- the foreign matter adheres more to the lower end portion 107a of the objective lens 107, so that the size of the hole 202 is preferably larger than that of the lower end portion 107a of the objective lens 107.
- the hole 202 By making the hole 202 larger than the lower end portion 107a of the objective lens 107, most of the foreign matter falling from the objective lens 107 is collected by the foreign matter collecting portion 122.
- the control unit 111 moves the foreign matter collecting unit 122 under the foreign matter attachment / detachment unit to which the foreign matter has adhered, for example, the objective lens 107.
- the control unit 111 moves the foreign matter collecting unit 122 under the foreign matter desorbing unit by controlling the movement of the sample stage 109.
- the control unit 111 sets the exciting current to the objective lens 107 that forms the magnetic field to 0, and eliminates the magnetic field formed in the sample chamber. Foreign matter that has adhered to the foreign matter attachment / detachment portion of the objective lens 107 or the like due to the magnetic field loses its adhesive force due to the disappearance of the magnetic field.
- the control unit 111 applies a voltage to each of the foreign matter collecting unit 122 and the foreign matter desorption unit.
- the voltage applied to the foreign matter collecting part 122 and the foreign matter desorption part is different from that when observing the sample, and an electric field having a strength to desorb the foreign matter adhering to the foreign matter desorbing part is applied to the foreign matter collecting part 122 and the foreign matter desorbing part.
- the dropped foreign matter is decelerated by repeatedly colliding with the inner wall surface of the foreign matter collecting unit 122, and is collected by the foreign matter collecting unit 122.
- the control unit 111 sets the exciting current to the objective lens 107 that forms the magnetic field to a value at the normal time, and restores the magnetic field formed in the sample chamber.
- the foreign matter adhering portion for example, the foreign matter adhering to the objective lens 107 is collected by the foreign matter collecting portion 122.
- the foreign matter that has fallen to the foreign matter collecting unit 122 and repeatedly collides with the bottom surface and side surfaces of the foreign matter collecting unit 122 and the lower surface of the lid 201 does not scatter and is not scattered.
- the foreign matter collecting portion 122 in which the lid 201 provided with the hole 202 through which the foreign matter passes is provided in the center is attached to the upper end portion has been described.
- the side surface of the foreign matter collecting unit 122 is inclined toward the bottom surface side.
- FIG. 4 is a cross-sectional view of a foreign matter collecting portion 122 arranged under the objective lens 107 that functions as a foreign matter attaching / detaching portion.
- the side surface 401 of the foreign matter collecting unit 122 of this embodiment is inclined toward the bottom surface side. Since the side surface 401 is inclined toward the bottom surface, the opening at the upper end of the foreign matter collecting portion 122 has an area smaller than the horizontal cross-sectional area of the internal space.
- the opening of the upper end portion of the foreign matter collecting portion 122 is preferably larger than the outer diameter of the lower end portion 107a of the objective lens 107 to which a larger amount of foreign matter adheres. Further, the lid 201 having a hole 202 in the center may not be attached to the upper end portion of the foreign matter collecting portion 122 of this embodiment.
- the foreign matter collecting unit 122 of this embodiment After the foreign matter that has fallen off from the foreign matter detaching part bounces off the bottom surface of the foreign matter collecting unit 122, it repeatedly collides with the side surface 401 and the bottom surface that are inclined toward the bottom surface side. Since the foreign matter that repeatedly collides with the inner wall surface of the foreign matter collecting portion 122 eventually decelerates, it stays in the internal space of the foreign matter collecting portion 122 without scattering. That is, also in this embodiment, as in the first embodiment, it is possible to provide a charged particle beam device capable of reducing the scattering of the recovered foreign matter.
- the foreign matter collecting portion 122 in which the lid 201 provided with the hole 202 through which the foreign matter passes is provided in the center is attached to the upper end portion has been described.
- a mesh electrode is provided at the upper end portion of the foreign matter collecting portion 122.
- FIG. 5A is a cross-sectional view of the foreign matter collecting portion 122 of the present embodiment arranged under the objective lens 107.
- the foreign matter collecting unit 122 of this embodiment is provided with a mesh electrode 501 in the hole 202 of the lid 201.
- the voids of the mesh electrode 501 are large enough to allow foreign matter to pass through. That is, the gap of the mesh electrode 501 is an opening at the upper end of the foreign matter collecting portion 122, and the gap of the mesh electrode 501 has an area smaller than the horizontal cross-sectional area of the internal space of the foreign matter collecting portion 122.
- the foreign matter collecting part 122 and the foreign matter removing part are compared with the foreign matter collecting part 122 of Example 1 shown in FIG. 5B.
- the strength of the electric field formed between the two can be increased.
- the equipotential surface 502 when a voltage is applied to the foreign matter collecting unit 122, the objective lens 107, and the shield electrode 108 is shown by a dotted line, and the equipotential surface 502 in FIG. 5A is larger than that in FIG. 5B.
- the interval is narrow and the strength of the electric field is large. That is, the foreign matter collecting unit 122 of this embodiment is easier to remove the foreign matter from the foreign matter attachment / detachment portion, and the foreign matter collecting unit 122 is easier to collect the foreign matter than the first embodiment.
- FIG. 6A is a cross-sectional view of a foreign matter collecting unit 122 of the first modified example arranged under the objective lens 107
- FIG. 6B is a foreign matter collecting unit 122 of the second modified example arranged under the objective lens 107. It is a cross-sectional view of.
- the lid 201 having a hole 202 in the center is not attached to the upper end of the foreign matter collecting portion 122, and only the mesh electrode 501 having a gap through which the foreign matter can pass is provided.
- the voids of the mesh electrode 501 are openings at the upper end of the foreign matter collecting portion 122, and the total area of the voids of the mesh electrode 501 is smaller than the horizontal cross-sectional area of the internal space of the foreign matter collecting portion 122.
- the mesh electrodes 501 of FIG. 6A have equal pitches, and the mesh electrodes 501 of FIG. 6B have unequal pitches, and the gaps of the mesh electrodes 501 are larger in the central portion than in the peripheral portion of the foreign matter collecting portion 122. ..
- the void in the central portion of the foreign matter collecting portion 122 larger than the void in the peripheral portion, foreign matter falling into the central portion of the foreign matter collecting portion 122 can easily pass through the void in the mesh electrode 501, and the bottom surface of the foreign matter collecting portion 122. It becomes difficult for foreign matter that bounces toward the edge portion to scatter from the foreign matter collecting portion 122.
- the foreign matter attachment / detachment portion is the objective lens 107
- the foreign matter recovery rate by the foreign matter collecting portion 122 can be improved by the structure of FIG. 6B.
- the foreign matter collecting portion 122 in which the lid 201 provided with the hole 202 through which the foreign matter passes is provided in the center is attached to the upper end portion has been described.
- providing a slit in the internal space of the foreign matter collecting unit 122 will be described. The matters described in the first embodiment and not described in the present embodiment can be applied to the present embodiment unless there are special circumstances.
- FIG. 7 is a cross-sectional view of the foreign matter collecting portion 122 arranged under the objective lens 107.
- a lid 201 having a hole 202 in the center is attached to the upper end portion, and a slit 701 having a gap extending in the falling direction of the foreign matter is provided in the internal space. It is provided in.
- the voids of the slit 701 are large enough to allow foreign matter to pass through.
- the foreign matter that has fallen off from the foreign matter desorbing portion and has passed through the gap of the slit 701 bounces off the bottom surface of the foreign matter collecting portion 122, and then repeatedly collides with the slit 701. Since the foreign matter that repeatedly collides with the slit 701 eventually decelerates, it stays in the internal space of the foreign matter collecting unit 122 without scattering. That is, also in this embodiment, as in the first embodiment, it is possible to provide a charged particle beam device capable of reducing the scattering of the recovered foreign matter.
- the slit 701 may be a conductive member and may be configured so that a voltage can be applied. By applying a voltage to the slit 701, it is possible to form an electric field in which the foreign matter recovery rate by the foreign matter collecting unit 122 can be improved.
- the foreign matter collecting portion 122 in which the lid 201 provided with the hole 202 through which the foreign matter passes is provided in the center is attached to the upper end portion has been described.
- an electrode for controlling the electric field formed between the foreign matter collecting portion 122 and the foreign matter desorbing portion is provided. The matters described in the first embodiment and not described in the present embodiment can be applied to the present embodiment unless there are special circumstances.
- FIG. 8 is a cross-sectional view of the foreign matter collecting portion 122 arranged under the objective lens 107.
- the foreign matter collecting unit 122 of this embodiment is provided with a lid 201 having a hole 202 in the center at the upper end portion and an electric field control electrode 801.
- the electric field control electrode 801 is an electrode to which a voltage for controlling the strength of the electric field formed between the foreign matter collecting unit 122 and the objective lens 107 is applied.
- the strength of the electric field between the foreign matter collecting portion 122 and the objective lens 107 can be further increased to facilitate the desorption of foreign matter from the foreign matter attachment / detachment portion, or the foreign matter can be easily detached.
- the recovery rate of foreign matter by the recovery unit 122 may be improved.
- the electric field between the foreign matter collecting portion 122 and the objective lens 107 can be set to an appropriate strength, so that the foreign matter is detached from the foreign matter attachment / detachment portion.
- the foreign matter collection unit 122 facilitates the collection of foreign matter. That is, also in this embodiment, it is possible to provide a charged particle beam device that can reduce the scattering of the collected foreign matter.
- the electric field control electrode 801 is preferably provided inside the objective lens 107. By providing the electric field control electrode 801 inside the objective lens 107, it becomes easy to control the strength of the electric field in the vicinity of the objective lens 107, so that foreign matter can be easily detached from the objective lens 107. Further, the electric field control electrode 801 may be used as a foreign matter desorption portion.
- the foreign matter collecting portion 122 in which the lid 201 provided with the hole 202 through which the foreign matter passes is provided in the center is attached to the upper end portion has been described.
- providing an inclined surface on the bottom surface of the foreign matter collecting unit 122 will be described. The matters described in the first embodiment and not described in the present embodiment can be applied to the present embodiment unless there are special circumstances.
- FIG. 9A is a cross-sectional view of a foreign matter collecting portion 122 arranged under the objective lens 107 that functions as a foreign matter attaching / detaching portion.
- the foreign matter collecting unit 122 of this embodiment has a bottom surface having an inclined surface.
- the inclined surface is directly below the lower end portion 107a of the objective lens 107 to which a larger amount of foreign matter adheres.
- a lid 201 having a hole 202 in the center may be attached to the upper end portion of the foreign matter collecting portion 122 of this embodiment.
- the lid 201 is attached to the upper end portion of the foreign matter collecting portion 122, it is preferable that the inclined surface is directly below the hole 202 of the lid 201.
- the foreign matter collecting unit 122 of the present embodiment after the foreign matter that has fallen off from the foreign matter removing portion bounces off the inclined surface of the bottom surface of the foreign matter collecting portion 122, the foreign matter collecting portion 122 has a side surface and a bottom surface, and the lid 201 has a lower surface. Repeat the collision. Since the foreign matter that repeatedly collides with the inner wall surface of the foreign matter collecting portion 122 and the lid 201 eventually decelerates, it stays in the internal space of the foreign matter collecting portion 122 without scattering. That is, also in this embodiment, as in the first embodiment, it is possible to provide a charged particle beam device capable of reducing the scattering of the recovered foreign matter.
- the foreign matter collecting portion 122 in which the lid 201 provided with the hole 202 through which the foreign matter passes is provided in the center is attached to the upper end portion has been described.
- the adhesive force of at least a part of the inner wall surface of the foreign matter collecting part 122 is made larger than that of the other parts.
- FIG. 10A is a cross-sectional view of a foreign matter collecting portion 122 arranged under the objective lens 107 that functions as a foreign matter attaching / detaching portion.
- the foreign matter collecting unit 122 of this embodiment is a surface 1001 whose inner wall surface is a mirror surface.
- the surface roughness of the mirrored surface 1001 is, for example, an arithmetic mean roughness Ra value of 1 nm or less.
- the inner wall surface which is the mirrored surface 1001
- the inner wall surface has a large effective contact area with foreign matter having a particle size of several nm to several tens of ⁇ m, and the adhesive force due to van der Waals force or the like increases 2 to 10 times.
- the adhesive force of the foreign matter in contact with the inner wall surface of the foreign matter collecting unit 122 is increased, the scattering from the foreign matter collecting unit 122 can be reduced.
- a lid 201 having a hole 202 in the center may be attached to the upper end portion of the foreign matter collecting portion 122 of this embodiment.
- the lid 201 is attached to the upper end of the foreign matter collecting portion 122, it is preferable that at least the surface 1001 having a mirror surface is directly below the hole of the lid 201 through which foreign matter falling from the foreign matter attachment / detachment portion such as the objective lens 107 passes.
- a part of the inner wall surface of the foreign matter collecting portion 122, particularly the portion directly below the hole of the lid 201 may be made of a material different from other surfaces, for example, a material having lower rigidity than the foreign matter and easily deformed. In a place where the material has lower rigidity and is more easily deformed than the foreign matter, the effective surface area with the foreign matter increases, so that the adhesion force of the foreign matter increases.
- a part of the inner wall surface of the foreign matter collecting part 122 may be made of a material in which water molecules are easily adsorbed according to the degree of vacuum and the temperature in the foreign matter collecting part 122.
- a part of the inner wall surface of the foreign matter collecting unit 122 may be made of a material having a linear molecule and a larger molecular weight. In places where the material is a linear molecule and has a larger molecular weight, the adhesive force due to the Van der Waals force increases.
- the adhesive force of the inner wall surface of the foreign matter collecting unit 122 to at least a part of the foreign matter is increased, so that the scattering of the foreign matter from the foreign matter collecting unit 122 can be reduced. Further, by limiting the locations where different materials are used to a part of the inner wall surface of the foreign matter collecting unit 122, the material cost and the processing cost can be reduced.
- the plurality of examples of the charged particle beam apparatus of the present invention have been described above.
- the present invention is not limited to the above-described embodiment, and the components can be modified and embodied without departing from the gist of the invention.
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Abstract
Description
制御部111は、異物が付着した異物脱着部、例えば対物レンズ107の下に、異物回収部122を移動させる。異物回収部122が試料ステージ109の上に設けられている場合、制御部111は試料ステージ109の移動を制御することにより、異物回収部122を異物脱着部の下に移動させる。
制御部111は、磁界を形成する対物レンズ107への励磁電流を0にして、試料室内に形成される磁界を消失させる。対物レンズ107等の異物脱着部に磁界によって付着していた異物は、磁界の消失によって付着力を失う。
制御部111は、異物回収部122と異物脱着部のそれぞれに電圧を印加する。異物回収部122と異物脱着部に印加される電圧は、試料を観察するときとは異なる電圧であり、異物脱着部に付着する異物を脱離させる強度の電界を異物回収部122と異物脱着部の間に形成する。すなわち、電圧がそれぞれ印加される異物回収部122と異物脱着部の間に形成される電界により、異物が異物脱着部から脱離し、異物回収部122の上端部に取り付けられる蓋201の中央に設けられる穴202の中へ落下する。落下した異物は、異物回収部122の内壁面との衝突を繰り返すことにより減速し、異物回収部122に回収される。
制御部111は、磁界を形成する対物レンズ107への励磁電流を通常時の値にし、試料室内に形成される磁界を元に戻す。
Claims (15)
- 試料が配置される試料室と、
前記試料に荷電粒子線を照射する荷電粒子線源を備える荷電粒子線装置であって、
異物が脱着する異物脱着部と、
前記試料室に設けられ、前記異物脱着部から落下する異物を回収する異物回収部をさらに備え、
前記異物回収部の上端部には、前記異物が通過する開口が設けられ、
前記開口の面積は前記異物回収部の内部空間の水平断面積よりも小さいことを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置であって、
前記開口は、前記上端部に取り付けられる蓋の中央に設けられる穴であることを特徴とする荷電粒子線装置。 - 請求項2に記載の荷電粒子線装置であって、
前記穴には、メッシュ電極が設けられることを特徴とする荷電粒子線装置。 - 請求項2に記載の荷電粒子線装置であって、
前記穴に対向する底面は、前記異物回収部の側面と向き合う傾斜面を有することを特徴とする荷電粒子線装置。 - 請求項2に記載の荷電粒子線装置であって、
前記異物脱着部は、前記荷電粒子線を集束する対物レンズであり、
前記穴の大きさは、前記対物レンズの下端部よりも大きいことを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置であって、
前記異物回収部は、底面側に傾斜する側面を有することを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置であって、
前記開口は、前記上端部に取り付けられるメッシュ電極の空隙であることを特徴とする荷電粒子線装置。 - 請求項7に記載の荷電粒子線装置であって、
前記メッシュ電極の空隙は前記異物回収部の辺縁部よりも中央部の方が大きいことを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置であって、
前記異物回収部は、異物の落下方向に延在する空隙を有するスリットが内部空間に設けられることを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置であって、
前記異物回収部の内壁面の少なくとも一部は鏡面または前記異物回収部とは異なる材料の面であることを特徴とする荷電粒子線装置。 - 請求項1に記載の荷電粒子線装置であって、
前記異物脱着部は、前記荷電粒子線を集束する対物レンズであり、
前記異物回収部には、前記対物レンズから前記異物を脱離させるための電圧が印加されることを特徴とする荷電粒子線装置。 - 請求項11に記載の荷電粒子線装置であって、
前記異物回収部と前記対物レンズとの間の電界の強度をより大きくする電圧が印加される電極である電界制御電極をさらに備えることを特徴とする荷電粒子線装置。 - 請求項12に記載の荷電粒子線装置であって、
前記電界制御電極は前記対物レンズの内側に設けられることを特徴とする荷電粒子線装置。 - 試料が配置される試料室と、
前記試料に荷電粒子線を照射する荷電粒子線源を備える荷電粒子線装置であって、
異物が脱着する異物脱着部と、
前記試料室に設けられ、前記異物脱着部から落下する異物を回収する異物回収部をさらに備え、
前記異物回収部の底面は、傾斜面を有することを特徴とする荷電粒子線装置。 - 試料が配置される試料室と、
前記試料に荷電粒子線を照射する荷電粒子線源を備える荷電粒子線装置であって、
異物が脱着する異物脱着部と、
前記試料室に設けられ、前記異物脱着部から落下する異物を回収する異物回収部をさらに備え、
前記異物回収部の内壁面の少なくとも一部は鏡面または前記異物回収部とは異なる材料の面であることを特徴とする荷電粒子線装置。
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KR1020227017223A KR20220086651A (ko) | 2019-12-23 | 2019-12-23 | 하전 입자선 장치 |
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US20090166565A1 (en) * | 2008-01-02 | 2009-07-02 | Gregory Robert Alcott | Ion implanters |
JP2014082140A (ja) * | 2012-10-18 | 2014-05-08 | Hitachi High-Technologies Corp | 荷電粒子線装置内の異物除去方法、及び荷電粒子線装置 |
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JP2011081282A (ja) * | 2009-10-09 | 2011-04-21 | Hoya Corp | フォトマスク用欠陥修正方法、フォトマスク用欠陥修正装置、フォトマスク用欠陥修正ヘッド、及びフォトマスク用欠陥検査装置、並びにフォトマスクの製造方法 |
US10573486B2 (en) * | 2015-07-07 | 2020-02-25 | Value Engineering, Ltd. | Repeller, cathode, chamber wall and slit member for ion implanter and ion generating devices including the same |
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US20090166565A1 (en) * | 2008-01-02 | 2009-07-02 | Gregory Robert Alcott | Ion implanters |
JP2014082140A (ja) * | 2012-10-18 | 2014-05-08 | Hitachi High-Technologies Corp | 荷電粒子線装置内の異物除去方法、及び荷電粒子線装置 |
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