WO2011046116A1 - ガス電解電離イオン源、イオンビーム装置 - Google Patents
ガス電解電離イオン源、イオンビーム装置 Download PDFInfo
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- WO2011046116A1 WO2011046116A1 PCT/JP2010/067872 JP2010067872W WO2011046116A1 WO 2011046116 A1 WO2011046116 A1 WO 2011046116A1 JP 2010067872 W JP2010067872 W JP 2010067872W WO 2011046116 A1 WO2011046116 A1 WO 2011046116A1
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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
- H01J37/08—Ion sources; Ion guns
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J27/00—Ion beam tubes
- H01J27/02—Ion sources; Ion guns
- H01J27/26—Ion sources; Ion guns using surface ionisation, e.g. field effect ion sources, thermionic ion sources
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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
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/002—Cooling arrangements
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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
- H01J2237/006—Details of gas supplies, e.g. in an ion source, to a beam line, to a specimen or to a workpiece
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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
- H01J2237/06—Sources
- H01J2237/08—Ion sources
- H01J2237/0802—Field ionization sources
- H01J2237/0807—Gas field ion sources [GFIS]
Definitions
- the present invention relates to a gas electrolytic ionization ion source and an ion beam apparatus using the same.
- Non-Patent Document 1 is equipped with a gas field ionization ion source (abbreviated as GFIS) and used gas ions such as hydrogen (H 2 ), helium (He), and neon (Ne).
- GFIS gas field ionization ion source
- H 2 hydrogen
- He helium
- Ne neon
- a focused ion beam (FIB) apparatus is described.
- These gas FIBs have the advantage of not causing Ga contamination in the sample, like gallium (Ga) FIB from Liquid Metal Ion Source (abbreviated as LMIS for short) which is currently used.
- LMIS Liquid Metal Ion Source
- Non-Patent Documents 2 and 3 below and Patent Document 1 described below provide an ion source by providing a minute protrusion (emitter tip) at the emitter tip of the GFIS or reducing the number of atoms at the emitter tip to several or less. It has been disclosed that the ion source characteristics are improved, for example, the radiation angle current density is increased.
- Patent Document 2 and Patent Document 3 disclose manufacturing by electrolytic evaporation from tungsten (W) as an emitter material.
- Non-Patent Document 3 below discloses that a minute protrusion is produced using a second metal different from the emitter material of the first metal.
- Non-patent document 2 discloses a scanning charged particle microscope equipped with a GFIS that ion-releases He, which is a light element.
- He ions are about 7000 times heavier than electrons and about 1/17 times lighter than Ga ions from the viewpoint of the weight of irradiated particles. Therefore, the sample damage related to the magnitude of the momentum transferred by the irradiated He ions to the sample atoms is slightly more than that of the electrons, but very small compared to the Ga ions.
- an excitation region of secondary electrons due to penetration of irradiated particles into the sample surface is localized on the sample surface as compared with electron irradiation.
- the scanning ion microscope (abbreviated as SIM) image is expected to be more sensitive to sample surface information than the scanning electron microscope (abbreviated as SEM). Further, from the viewpoint of a microscope, ions are heavier than electrons, and therefore, the diffraction effect can be ignored in the beam focusing, and an image having a very deep depth of focus can be obtained.
- Non-Patent Document 3 describes that the ion current can be increased by lowering the temperature of the emitter tip in GFIS. However, it is also described that the ionic current does not increase even if the temperature is lowered from the vicinity of the gas liquefaction point (boiling point), and may decrease.
- Patent Document 3 describes the use of a mixed gas in GFIS. Although the component ratio of the added gas is small and the purpose is not clear, it is expected that it contributes to the formation and regeneration of the tip of the emitter tip and to the stabilization of the ion source according to the description in the specification. It seems that The document also describes providing a plurality of independent gas supply means.
- Patent Document 4 describes that a first gas and a second gas are taken into an emitter region to generate an ion beam of these gases.
- Patent Document 5 describes an ion source having two or more gas introduction systems in order to switch between a gas ion beam type for processing a sample and a gas ion beam type for observing the sample.
- JP 58-85242 A Japanese Patent Laid-Open No. 7-192669 Special table 2009-517846 gazette JP 2009-187950 A JP 2008-270039 A
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a GFIS capable of emitting heavy ions suitable for sample processing with high brightness.
- the gas electrolytic ion source according to the present invention includes a temperature control unit that individually controls the temperature of the tip of the emitter electrode and the temperature of the gas discharge port of the gas supply unit.
- the temperature of the tip of the emitter electrode can be lowered while keeping the gas temperature high. Therefore, the temperature of the tip of the emitter electrode can be lowered.
- FIG. 1 is a cross-sectional view showing a configuration of an ion beam apparatus 200 according to Embodiment 1.
- FIG. 3 is a diagram showing an internal configuration of an extraction voltage application unit 4.
- FIG. 3 is a cross-sectional view showing a configuration in which a gas discharge port portion 3 of a gas supply pipe 30 is modified.
- FIG. It is a schematic diagram which shows the structure of the ion beam apparatus 200 which concerns on Embodiment 2.
- FIG. It is sectional drawing which shows the structure of the ion beam apparatus 200 which concerns on Embodiment 3.
- FIG. 10 is a diagram showing an internal configuration of an extraction voltage application unit 4-2 in the third embodiment.
- It is a schematic diagram which shows the structure of the ion beam apparatus 200 which concerns on Embodiment 4.
- FIG. FIG. 10 is a diagram showing a configuration example of GFIS that exhibits the same effect as in the first to fifth embodiments.
- FIG. 1 is a cross-sectional view showing a configuration of an ion beam apparatus 200 according to Embodiment 1 of the present invention.
- the ion beam apparatus 200 is an apparatus that includes a gas electrolysis ion source (GFIS), converges an ion beam emitted from the GFIS, and irradiates the sample to observe and process the sample.
- GFIS gas electrolysis ion source
- the vacuum vessel 10 is maintained at an ultrahigh vacuum of 10 ⁇ 8 Pa level by an exhaust system (not shown) connected to the exhaust port 11. When not connected to other devices, the vacuum vessel 10 is closed with the valve 12.
- an emitter tip 1 having a needle-like tip and an extraction electrode 2 having an opening facing the tip are arranged.
- the emitter tip 1 requires an axis alignment mechanism, the illustration is omitted for the sake of simplicity.
- the gas discharge port portion 3 of the gas supply pipe 30 supplies a gas to be ionized near the tip of the emitter tip 1.
- a gas cylinder 31 is connected to the gas supply pipe 30 via a valve 32.
- the emitter tip 1 is connected to the extraction voltage application unit 4 via the high voltage introduction terminal 40-1, and the extraction electrode 2 is connected to the extraction voltage application unit 4 via the high voltage introduction terminal 40-2.
- the extraction electrode 2 is connected to the extraction voltage application unit 4 via the high voltage introduction terminal 40-2.
- only one wiring for applying a potential to the emitter tip 1 is sufficient.
- the emitter tip 1 is connected to a cooling head 20 introduced from outside the vacuum vessel 10 (for example, connected to a Gifford-McMahon refrigerator) with a heat transfer mesh wire (oxygen-free copper) 21-1. Cooling is performed by heat exchange through the heat transfer support (oxygen-free copper) 22-1 and the heat transfer insulator (sapphire) 23-1.
- the gas discharge port portion 3 performs heat exchange with the cooling head 20 via a heat transfer network wire (oxygen-free copper) 21-2 and a heat transfer support (oxygen-free copper) 22-2. To be cooled.
- the gas discharge port portion 3 is made of oxygen-free copper having good heat transfer. Since each member has good heat transfer, the emitter tip 1 and the gas discharge port portion 3 are cooled to substantially the same temperature.
- the heater 25 heats the gas discharge port portion 3. Thereby, since the temperature of the gas discharge port part 3 can be raised rather than the emitter tip 1, even when using gas with a high liquefaction point, gas temperature can be kept more than a liquefaction point.
- the above oxygen-free copper material was plated with gold to reduce thermal radiation.
- the heat insulating supports (stainless steel thin pipes) 24-1 and 24-3 are useful for blocking heat entry from the outside.
- the gas supply pipe 30 is made of stainless steel having poor heat conduction except for the gas supply port 3 and further wound to increase the conduction distance and prevent heat from entering from the outside. Further, several heat shield walls are required to keep the temperature of each part stable, but the illustration is omitted for simplification.
- FIG. 2 is a diagram showing an internal configuration of the extraction voltage application unit 4.
- the acceleration voltage controller 43 and the extraction voltage controller 44 control the high-voltage power supplies 41-1 and 41-2 while adjusting the master and slave of the acceleration voltage Va and the extraction voltage Vex so that the voltages do not become negative.
- the emitter tip heating power source 42 is for heating the emitter tip 1 to about 1000K to improve the state of its tip, and is not used at the time of ion emission.
- the “temperature control unit” in the first embodiment adjusts the temperature of the emitter tip 1 and the gas supply port 3 such as the cooling head 20, the heat transfer mesh wire, the heat transfer support, the heat transfer insulator, and the heater 25. Including a mechanism for It is added that the emitter tip heating power source 42 is not included in the “temperature control unit” in the first embodiment.
- the “gas electrolysis ion source” includes the emitter tip 1, the extraction electrode 2, the gas supply pipe 30, the gas discharge port portion 3, the extraction voltage application unit 4, and the “temperature control unit”.
- the extraction voltage applying unit 4 applies a voltage with the emitter tip 1 being positive and the extraction electrode being negative, at some point gas atoms (molecules) that have come out of the gas discharge port portion 3 and have reached the tip of the emitter tip 1 are detected. A part of which becomes positive ions by field ionization, and ion emission occurs.
- the gas when the emitter tip 1 is cooled in order to increase ion emission, the gas is also cooled at the same time, and as the gas approaches the liquefaction point (boiling point), the gas gradually liquefies and the gas supply may be hindered. . For this reason, it is considered that ion emission due to field ionization from a heavy gas generally having a high liquefaction point (boiling point) cannot be sufficiently increased.
- the cooling system is configured so that the temperature of the gas discharge port portion 3 is always higher than that of the emitter tip 1. Due to the action of the cooling head 20, the heat transfer mesh wires, the heat transfer mesh wires 21-1 and 21-2, the heat transfer supports 22-1 and 22-2, and the heat transfer insulator 23-1, the emitter tip 1 and the gas
- the emitter portion 3 can be cooled to increase the emitter current, and a high-intensity ion beam can be emitted. Further, in order to cope with the high liquefaction point of heavy ions, the gas discharge port portion 3 is heated by the heater 25 as necessary. With these configurations, the temperature of the emitter tip 1 and the temperature of the gas discharge port portion 3 can be individually adjusted.
- the emitter tip 1 is formed by welding a tungsten (W) single crystal to the tip of a hairpin filament, and an iridium (Ir) atom is formed on the W (111) crystal surface of the tip. A pyramid is formed. Argon (Ar) was used as the gas. Ar ions have a mass that is slightly more than half that of Ga, and are suitable for processing.
- the ion extraction voltage is about 4 kV.
- the gas discharge port portion 3 was separated from the emitter tip 1 by several mm so as not to cause excessive discharge.
- the temperature of the gas outlet 3 was kept at about 90K (the boiling point of Ar was about 87K) and the temperature of the emitter tip 1 was lowered to about 40K, the ionic current increased monotonously.
- the ion current of Ar which was conventionally said to have a peak at around 70K, could be increased several times or more.
- xenon (Xe) gas which is heavier than Ar, and in this case, the temperature of the gas discharge port portion 3 needs to be increased to about 170K.
- GM refrigerator only one GM refrigerator is used, but two independent refrigerators may be used. Although expensive, temperature control becomes easy.
- a second GM refrigerator may be provided to adjust the temperature of the gas discharge port portion 3.
- the extraction voltage application unit 4 as shown in FIG. 2 is used. However, if an appropriate voltage difference is generated between the emitter tip 1 and the extraction electrode 2, other configurations are adopted. May be.
- FIG. 3 is a cross-sectional view showing a configuration in which the gas discharge port portion 3 of the gas supply pipe 30 is deformed.
- the gas discharge port portion 3 of the gas supply pipe 30 is projected in a nozzle shape, but the nozzle-shaped projection is eliminated in the configuration shown in FIG. 3.
- the portion around the opening (gas outlet) of the heat transfer support 22-2 is treated as the gas discharge port portion 3-1 of the gas supply pipe 30.
- the opening of the gas discharge port portions 3 and 3-1 of the gas supply pipe be directed to the tip of the emitter tip 1. This is because there is a high probability that the supplied gas reaches the tip of the emitter tip 1 directly. Further, when the gas reaches not the tip of the emitter tip 1 but the base support member, the gas kept above the liquefaction point (boiling point) is cooled and adsorbed, so that the gas reaches the tip of the emitter tip 1. This is because there is almost nothing to do.
- the direction of the opening has a likelihood and does not need to be strictly directed to the tip of the emitter tip 1.
- the gas that has not been ionized may be adsorbed by the support member of the emitter tip 1 having a low temperature. It is desirable to release the gas adsorbed on the support member by raising the temperature of the emitter tip 1 and its support member to the liquefaction point (boiling point) of the gas to be used at an appropriate interval.
- the emitter tip heating power source 42 can be used for heating.
- the emitter tip 1 can be cooled to increase the number of emitter electrodes, and the gas discharge port portion 3 can be heated by the heater 25 to keep the gas above the liquefaction point.
- the heater 25 can be heated by the heater 25 to keep the gas above the liquefaction point.
- FIG. 4 is a schematic diagram showing a configuration of an ion beam apparatus 200 according to Embodiment 2 of the present invention.
- the ion beam apparatus 200 according to the second embodiment is configured by incorporating the GFIS described in the first embodiment (reference numeral 100 in FIG. 4) into a conventional focused ion beam apparatus manufactured for Ga-LMIS. Is.
- each configuration of FIG. 4 will be described.
- the ion beam 5 emitted from the emitter tip 1 is focused by the electrostatic lenses 102-1 and 102-2 and irradiated onto the sample 6.
- the irradiation position of the ion beam 5 on the sample 6 is adjusted by deflecting the ion beam 5 by the deflectors 103-1 and 103-2.
- Secondary electrons 7 generated from the sample 6 are detected by the secondary electron detector 104, and a secondary electron observation image in which the signal intensity corresponds to the deflection intensity is formed by the display 110.
- the user can designate the position of irradiation with the ion beam 5 on the screen while viewing the secondary electron observation image using the display device 110.
- the lens system 102 including the electrostatic lenses 102-1 and 102-2, the beam limiting aperture 102-3, and the aligner 102-4 is controlled by a lens system controller 105.
- the deflection system 103 including the deflectors 103-1 and 103-2 is controlled by the deflection system controller 106.
- symbol of the box showing the driver of each part is abbreviate
- the “image processing unit” in the second embodiment corresponds to the display device 110.
- the “control unit” corresponds to the lens system controller 105 and the deflection system controller 106.
- a focused ion beam apparatus that processes a sample using a heavy ion beam such as Ar or Xe can be obtained.
- the ion emission angle from the GFIS is about an order of magnitude smaller than that in the case of Ga-LMIS, the ion current can be reduced only by actually limiting it. Further, if a SIM image is acquired with a reduced ion dose, the position accuracy is deteriorated due to noise.
- FIG. 5 is a cross-sectional view showing the configuration of the ion beam apparatus 200 according to the third embodiment.
- the ion beam apparatus 200 according to the third embodiment has substantially the same configuration as that described in any of the first and second embodiments, but the configuration for switching the ion species is different from the first and second embodiments. Different. Below, it demonstrates centering around difference.
- the gas cylinder 31-2 is filled with a mixed gas having a plurality of main components.
- the extraction limiting diaphragm 8 has an opening through which the ion beam emitted from the emitter electrode passes. By appropriately setting the position and aperture of the opening, a beam of a desired ion species can be selectively passed. Details will be described later with reference to FIG.
- the extraction voltage application unit 4-2 is equipped with a memory that stores the value of the extraction voltage corresponding to the number of main components of the mixed gas. This value is for switching the extraction voltage according to the switching of the ion species. Details will be described later with reference to FIG.
- the memory included in the extraction voltage application unit 4-2 corresponds to the “first storage unit” in the third embodiment.
- the configuration of the ion beam apparatus 200 according to Embodiment 3 has been described above. Next, the operation of the ion beam apparatus 200 according to Embodiment 3 will be described in the case where a mixed gas containing 40% He and 60% Xe is used.
- FIG. 6 is a diagram showing changes in the ion beam when the extraction voltage is increased.
- FIG. 6A shows a state when the extraction voltage is low
- FIG. 6B shows a state when the extraction voltage is high.
- Xe is more susceptible to ionization by field ionization than He. Therefore, when the extraction voltage is increased, first, an ion beam 5-1 composed only of Xe ions is emitted from the minute protrusion 1-1 at the tip of the emitter tip 1 as shown in FIG.
- FIG. 7 is a diagram showing an internal configuration of the extraction voltage applying unit 4-2 in the third embodiment.
- the configuration of the extraction voltage application unit 4-2 is substantially the same as the configuration described in FIG. 2 of the first embodiment, but the extraction voltage controller 44-2 supplies an extraction voltage corresponding to the gas component to the extraction voltage memory 45. However, it is possible to change the extraction voltage by calling it.
- Switching the ion species by GFIS can be realized without using the method described in the third embodiment, for example, by using a method in which a plurality of gas cylinders 31 are switched using valves.
- gas switching is not realistic because it takes several hours to reach a stable state.
- the third embodiment is advantageous in that the ion species can be switched in the time required for changing the extraction voltage (about several ms).
- the method of selectively passing a desired one of the plurality of types of ion beams contained in the mixed gas using the extraction limiting diaphragm 8 described in the third embodiment can be used alone or in the embodiment. It can also be used in combination with the methods described in 1-2.
- various heavy ion gases may be used as the gas to be mixed in the second embodiment. it can.
- the temperature of the gas discharge port portion 3 needs to be determined in accordance with the gas component having the highest boiling point in the mixed gas to be used.
- the temperature of the gas discharge port portion 3 may be set to about 170K, for example.
- a mixed gas having two main components has been described.
- the same method as in the third embodiment can be used for a mixed gas having three or more main components.
- a mixed gas having three or more main components is used and only ion species corresponding to two of the gas components are used and only two extraction voltage values are stored, The same effect as in the third aspect can be exhibited.
- FIG. 8 is a schematic diagram showing a configuration of an ion beam apparatus 200 according to Embodiment 4 of the present invention.
- the GFIS reference numeral 100-2 in FIG. 4
- the third embodiment is incorporated into a focused ion beam apparatus manufactured for a conventional Ga-LMIS. It is an improvement.
- FIG. 8 will be described.
- the ion species contained in the mixed gas can be switched at high speed.
- the ion extraction voltage application unit 4-2 outputs a signal to that effect to the lens system controller 105-2 and the deflection system controller 106-2.
- the lens system controller 105-2 and the deflection system controller 106-2 are provided with a storage device such as a memory for storing each setting for each ion species, and the ion species is switched from the ion extraction voltage application unit 4-2. When the signal is received, the corresponding setting is called to perform control corresponding to the ion species.
- the memory included in the lens system controller 105-2 and the deflection system controller 106-2 corresponds to the “second storage unit” in the fourth embodiment.
- the display 110-2 stores the secondary electron observation image in a storage device such as a memory. At this time, the display 110-2 memorizes together the ion species switching signal from the ion extraction voltage application unit 4-2 as a label. Thereby, the correspondence between the ion species and the secondary electron observation image can be stored.
- the sample 6 is irradiated with an ion beam 5 of He ions to obtain a secondary electron observation image, which is stored in a storage device provided in the display 110-2.
- the user visually confirms the secondary electron observation image on the display 110-2, designates the position where the sample 6 is to be processed on the secondary electron observation image, switches the ion beam 5 to Xe ions, Processing can be performed by irradiating the position with an ion beam. That is, the ion species is switched for each purpose, such as irradiating the sample 6 with the He ion beam when determining the irradiation position of the ion beam, and irradiating the sample 6 with the heavier Xe ion beam when performing the processing. be able to.
- Embodiment 5 the configuration of the ion beam apparatus 200 that can switch the ion species between when the irradiation position is determined and when processing is performed has been described.
- Embodiment 5 of the present invention an example in which the function of switching ion species is used for another purpose will be described.
- a mixed gas containing 30% H 2 and 70% He is used as the gas supplied to the GFIS.
- two types of secondary electron observation images of H and He are obtained for the same sample 6. Since both ion species hardly cause sputtering, a surface image with high SN and high resolution can be obtained.
- These two secondary electron observation images include a component having substantially the same sensitivity to surface irregularities and a component having different sensitivities to surface element species.
- the display device 110-2 performs a comparison operation on these two secondary electron observation images. Thereby, for example, an image specialized in surface irregularities and an image specialized in surface element species can be generated.
- the extraction voltage corresponding to the main component of the mixed gas stored in advance is called from the storage device, and the corresponding lens system and deflection system settings are called in conjunction with each other, so that high speed is achieved. It was shown that the ion species can be switched.
- changing the extraction voltage in accordance with the ion species is equivalent to changing the electric field strength at the tip of the emitter tip 1 in accordance with the ion species. Therefore, in the sixth embodiment of the present invention, the electric field intensity at the tip of the emitter tip 1 is changed by a method different from that in the third to fifth embodiments, thereby achieving the same effect as changing the extraction voltage. An operation example will be described.
- FIG. 9 is a diagram illustrating a configuration example of the GFIS that exhibits the same effect as the third to fifth embodiments. For simplicity of description, only the arrangement of each electrode and power source is shown.
- FIG. 9A shows the same electrode and power supply arrangement as in the first embodiment.
- FIG. 9B shows another configuration example that exhibits the same effect.
- the suppression electrode 120 is arranged between the emitter tip 1 and the extraction electrode 2.
- a suppression voltage applying unit 121 is connected between the emitter tip 1 and the suppression electrode 120.
- the suppression voltage application unit 121 changes the electric field strength at the tip of the emitter tip 1 by applying a suppression voltage smaller than the extraction voltage to the suppression electrode 120.
- FIG. 9C shows the same electrode and power supply arrangement as in the third to fifth embodiments.
- FIG. 9D shows another configuration example that exhibits the same effect.
- switching the extraction voltage and switching the ion species is equivalent to switching the suppression voltage and switching the ion species in FIG. 9D where the suppression electrode 120 is arranged.
- the suppression voltage application unit 121-2 includes a storage unit that stores a suppression voltage value corresponding to the main component of the mixed gas, and has a function of calling the value and changing the suppression voltage to that value.
- the suppression voltage value corresponding to the ion species after switching is read, and the suppression voltage is applied to the suppression electrode 120. Thereby, the electric field strength at the tip of the emitter tip 1 can be switched according to the ion species.
- the electrolytic strength is changed only by changing the suppression voltage when switching the ion species.
- the suppression voltage and the extraction voltage are both changed to generate a comprehensive voltage change.
- an equivalent effect can be exhibited.
- the suppression voltage application unit 121-2 instead of the extraction voltage application unit 4-2 outputting the ion species switching signal, the suppression voltage application unit 121-2 outputs the suppression voltage switching signal.
- the lens system controller 105-2, the deflection system controller 106-2, and the display device 110-2 execute an operation according to the ion species after switching. As a result, the same effects as in the fourth to fifth embodiments can be exhibited.
Abstract
Description
図1は、本発明の実施の形態1に係るイオンビーム装置200の構成を示す断面図である。イオンビーム装置200は、ガス電解電離イオン源(GFIS)を備え、GFISから放出されるイオンビームを収束して試料に照射し、試料の観察や加工を行なう装置である。以下、図1に示す各構成要素について説明する。
図4は、本発明の実施の形態2に係るイオンビーム装置200の構成を示す模式図である。本実施の形態2に係るイオンビーム装置200は、実施の形態1で説明したGFIS(図4中の符号100)を、従来のGa-LMIS用に作製された集束イオンビーム装置に組み込んで構成したものである。以下、図4の各構成について説明する。
実施の形態1~2では、重いイオン種を高輝度で放出することを説明した。一方、加工を行なう前には、ビーム照射位置を決めるためにSIM像観察などを行なう。この過程でイオンビームを試料に照射する必要がある。このとき、イオンビームが試料へ余分な加工ダメージを与えてしまう可能性がある。加工ダメージを減らすために、イオン電流を減らしたり、イオンのドーズ量を減らしたりするには問題がある。
図8は、本発明の実施の形態4に係るイオンビーム装置200の構成を示す模式図である。本実施の形態4に係るイオンビーム装置200は、実施の形態3で説明したGFIS(図4中の符号100-2)を、従来のGa-LMIS用に作製された集束イオンビーム装置に組み込んで改良を加えたものである。以下、図8の各構成について説明する。
実施の形態4では、照射位置を決めるときと加工を行なうときでイオン種を切り替えることのできるイオンビーム装置200の構成を説明した。本発明の実施の形態5では、イオン種を切り替える機能を別の目的に使用する例を説明する。
実施の形態3~5では、あらかじめ記憶しておいた混合ガスの主成分に対応する引出し電圧を記憶装置から呼び出し、それと対応するレンズ系や偏向系の設定を連動して呼び出すことで、高速にイオン種を切り替え可能なことを示した。
実施の形態4の図8で説明したイオンビーム装置200において、実施の形態6で説明したような、抑制電極120を用いてエミッタティップ1先端部の電界強度を変化させる構成を採用することもできる。
Claims (15)
- エミッタ電極と引出し電極を有する電極部と、
前記エミッタ電極の先端近傍にガスを供給するガス供給部と、
前記エミッタ電極と前記引出し電極の間に電圧を印加して前記ガスをイオン化する電界を形成する電圧印加部と、
前記エミッタ電極の先端部の温度と前記ガス供給部のガス放出口部分の温度を個別に制御する温度制御部と、
を備えたことを特徴とするガス電解電離イオン源。 - 前記温度制御部は、
前記エミッタ電極の先端部と前記ガス供給部のガス放出口部分を同時に冷却する冷却部と、
前記ガス供給部のガス放出口部分を加熱する加熱部と、
を有することを特徴とする請求項1記載のガス電解電離イオン源。 - 前記エミッタ電極と前記引出し電極の間に配置する抑制電極を備え、
前記電圧印加部は、前記抑制電極と前記エミッタ電極の間に抑制電圧を印加して前記ガスをイオン化する電界を調整する
ことを特徴とする請求項1記載のガス電解電離イオン源。 - 請求項1記載のガス電界電離イオン源と、
試料を保持する試料ステージと、
前記ガス電界電離イオン源から放出されるイオンビームを集束して前記試料上に照射するレンズ系と、
前記イオンを偏向して前記試料上のイオンビームの照射位置を変える偏向系と、
前記試料から放出される2次粒子を検出する2次粒子検出器と、
前記2次粒子検出器の検出結果を用いて前記試料の観察像を形成する画像処理部と、
前記レンズ系および前記偏向系を制御して前記イオンビームの照射位置を調整する制御部と、
を備えたことを特徴とするイオンビーム装置。 - 前記ガス供給部は、複数の元素のガスを主成分として含む混合ガスを供給するように構成されており、
前記エミッタ電極が放出するイオンビームを通過させる開口部を有する引出し制限絞りと、
前記エミッタ電極から放出されるイオンの種類とそのとき前記電圧印加部が印加する電圧値との対応関係を表すデータを記憶する第1記憶部と、
を備えたことを特徴とする請求項1記載のガス電解電離イオン源。 - エミッタ電極と引出し電極を有する電極部と、
前記エミッタ電極の先端近傍に複数の元素のガスを主成分として含む混合ガスを供給するガス供給部と、
前記エミッタ電極と前記引出し電極の間に電圧を印加して前記ガスをイオン化する電界を形成する電圧印加部と、
前記エミッタ電極が放出するイオンビームを通過させる開口部を有する引出し制限絞りと、
前記エミッタ電極から放出されるイオンの種類とそのとき前記電圧印加部が印加する電圧値との対応関係を表すデータを記憶する第1記憶部と、
を備えたことを特徴とするガス電解電離イオン源。 - 前記エミッタ電極と前記引出し電極の間に配置する抑制電極を備え、
前記電圧印加部は、前記抑制電極と前記エミッタ電極の間に抑制電圧を印加して前記ガスをイオン化する電界を調整する
ことを特徴とする請求項6記載のガス電解電離イオン源。 - 請求項5記載のガス電界電離イオン源と、
試料を保持する試料ステージと、
前記ガス電界電離イオン源から放出されるイオンビームを集束して前記試料上に照射するレンズ系と、
前記イオンを偏向して前記試料上のイオンビームの照射位置を変える偏向系と、
前記試料から放出される2次粒子を検出する2次粒子検出器と、
前記2次粒子検出器の検出結果を用いて前記試料の観察像を形成する画像処理部と、
前記レンズ系および前記偏向系を制御して前記イオンビームの照射位置を調整する制御部と、
を備えたことを特徴とするイオンビーム装置。 - 請求項6記載のガス電界電離イオン源と、
試料を保持する試料ステージと、
前記ガス電界電離イオン源から放出されるイオンビームを集束して前記試料上に照射するレンズ系と、
前記イオンを偏向して前記試料上のイオンビームの照射位置を変える偏向系と、
前記試料から放出される2次粒子を検出する2次粒子検出器と、
前記2次粒子検出器の検出結果を用いて前記試料の観察像を形成する画像処理部と、
前記レンズ系および前記偏向系を制御して前記イオンビームの照射位置を調整する制御部と、
を備えたことを特徴とするイオンビーム装置。 - 前記エミッタ電極から放出されるイオンの種類とそのときの前記レンズ系および前記偏向系の設定値との対応関係を表すデータを記憶する第2記憶部を備え、
前記制御部は、
前記第1記憶部が格納しているデータに対応するデータを前記第2記憶部から読み出してそのデータが表す前記設定値に基づき前記レンズ系および前記偏向系を制御する
ことを特徴とする請求項8記載のイオンビーム装置。 - 前記エミッタ電極から放出されるイオンの種類とそのときの前記レンズ系および前記偏向系の設定値との対応関係を表すデータを記憶する第2記憶部を備え、
前記制御部は、
前記第1記憶部が格納しているデータに対応するデータを前記第2記憶部から読み出してそのデータが表す前記設定値に基づき前記レンズ系および前記偏向系を制御する
ことを特徴とする請求項9記載のイオンビーム装置。 - 前記画像処理部は、前記イオンビームの照射位置を指定する旨の操作入力を受け取り、
前記制御部は、その照射位置に前記イオンビームを照射するよう前記偏向系を制御する
ことを特徴とする請求項8記載のイオンビーム装置。 - 前記画像処理部は、前記イオンビームの照射位置を指定する旨の操作入力を受け取り、
前記制御部は、その照射位置に前記イオンビームを照射するよう前記偏向系を制御する
ことを特徴とする請求項9記載のイオンビーム装置。 - 前記画像処理部は、
前記エミッタ電極から放出される少なくとも2種類のイオンに対応した前記観察像を形成し、
各前記観察像を用いて補正処理を施した新たな2次粒子画像を形成して表示する
ことを特徴とする請求項8記載のイオンビーム装置。 - 前記画像処理部は、
前記エミッタ電極から放出される少なくとも2種類のイオンに対応した前記観察像を形成し、
各前記観察像を用いて補正処理を施した新たな2次粒子画像を形成して表示する
ことを特徴とする請求項9記載のイオンビーム装置。
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JP2011086465A (ja) | 2011-04-28 |
US9196453B2 (en) | 2015-11-24 |
JP5383419B2 (ja) | 2014-01-08 |
US8809801B2 (en) | 2014-08-19 |
US20120199758A1 (en) | 2012-08-09 |
US20140326897A1 (en) | 2014-11-06 |
DE112010004053B4 (de) | 2021-07-15 |
DE112010004053T5 (de) | 2012-12-06 |
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