WO2013150847A1 - 荷電粒子線装置 - Google Patents
荷電粒子線装置 Download PDFInfo
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- WO2013150847A1 WO2013150847A1 PCT/JP2013/055772 JP2013055772W WO2013150847A1 WO 2013150847 A1 WO2013150847 A1 WO 2013150847A1 JP 2013055772 W JP2013055772 W JP 2013055772W WO 2013150847 A1 WO2013150847 A1 WO 2013150847A1
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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
- H01J37/244—Detectors; Associated components or circuits therefor
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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
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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
-
- 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
- H01J2237/05—Arrangements for energy or mass analysis
-
- 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
- H01J2237/244—Detection characterized by the detecting means
- H01J2237/2446—Position sensitive detectors
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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
- H01J2237/244—Detection characterized by the detecting means
- H01J2237/24495—Signal processing, e.g. mixing of two or more signals
Definitions
- the present invention relates to a charged particle beam apparatus that observes a sample using a charged particle beam.
- scanning charged particle beam apparatuses are widely used in various industrial fields such as semiconductor fields, material fields, and medical fields because of their high spatial resolution.
- a charged particle beam is generally irradiated to a sample, and secondary electrons, reflected electrons and the like emitted from an irradiation position are detected.
- the secondary electron image mainly shows a contrast reflecting the surface shape of the sample.
- the backscattered electron image shows a contrast reflecting the composition. Therefore, various information of the sample can be acquired by discriminating and detecting secondary electrons and reflected electrons.
- a method of discriminating secondary electrons and reflected electrons a method of using a plurality of detectors arranged inside and outside a charged particle beam column, a method of performing energy filtering using a porous electrode, etc.
- Patent Document 2 Is being developed.
- Patent Document 1 shows a method of discriminating secondary electrons and reflected electrons using a position sensitive detector. The advantage of this method is that energy filtering can be performed using only a single detector.
- Patent Document 1 proposes a method using a position sensitive detector (for example, a CCD detector).
- a position sensitive detector for example, a CCD detector.
- the arrival position of the emitted electron differs not only by the energy of the electron but also by the condition of the focusing lens and the angle when emitted from the sample. Therefore, in order to accurately discriminate electrons having a desired energy or electrons emitted at a desired angle, it is necessary to finely set detection conditions of the position sensitive detector. Therefore, setting the setting of the position sensitive detector to a condition suitable for observation is a very complicated operation.
- Patent Document 2 proposes a method of performing energy filtering using an electrode.
- the energy region or angle region suitable for observation largely depends on the sample. Therefore, it is extremely difficult for the operator who is not accustomed to observation to set the observation conditions properly.
- the observation results largely change depending on the energy of the irradiation electron beam. Therefore, setting of the energy of the irradiation electron beam is also one of the troublesome operations for the operator who is not accustomed to observation.
- the present invention provides an apparatus that solves these problems.
- the first charged particle beam device is a trajectory calculation simulator for calculating the position reached by the secondary particle emitted from the sample, or a database recording the position reached by the secondary particle emitted from the sample, Alternatively, it has a database in which conditions of secondary particles detected by the detector are recorded.
- the second charged particle beam device detects two or more lenses for focusing charged particle beams on a sample, a controller for independently controlling the lenses, and secondary particles emitted from the sample.
- a detector and an operator that compares the signal obtained by the detector for each of the lens conditions.
- the present invention facilitates energy discrimination or angular discrimination of secondary particles emitted from a sample. Alternatively, optimum observation conditions can be easily set.
- Flow chart 1 showing an example of control flow of the detector.
- Flow chart 2 showing an example of control flow of the detector.
- An example of the GUI screen which sets the energy range or angle range of the secondary electron to detect.
- An example of a GUI screen which sets a threshold of detection efficiency.
- An example of a GUI screen which notifies conditions of an active detection element and a secondary particle to detect.
- the flowchart which shows an example of the control flow of a focusing lens.
- FIG. 1 is a schematic view of a charged particle beam apparatus according to an embodiment of the present invention.
- the charged particle beam apparatus includes a charged particle beam source 102 generating a charged particle beam 101, and the charged particle beam 101 emitted from the charged particle beam source 102 is accelerated by an acceleration electrode 103.
- An acceleration voltage for accelerating the charged particle beam 101 is controlled by an acceleration electrode controller 153 which controls the acceleration electrode 103.
- the charged particle beam 101 is deflected by the first condenser lens 104 and the second condenser lens 105 to adjust the passing amount of the charged particle beam 101 passing through the diaphragm (not shown), and the charged particle beam 101 irradiated to the sample 110.
- Control the amount of The first condenser lens 104 and the second condenser lens 105 are controlled by a first condenser lens controller 154 and a second condenser lens controller 155, respectively.
- the charged particle beam 101 is focused after being focused on the surface of the sample 110 by the objective lens 106, and secondary particles (secondary electrons, reflected electrons, etc.) emitted from the irradiation position of the charged particle beam 101 of the sample 110 Is detected by the position sensitive detector 107.
- the objective lens 106 is controlled by an objective lens controller 156, and the position sensitive detector 107 has a structure in which an element is disposed at each position of a CCD element or the like, and detects secondary particles at each position. It is.
- elements at each location can be activated / inactivated.
- an active element refers to validating the signal acquired by that element. Therefore, it includes not only the ON / OFF of the element but also a system for judging the validity / invalidity of the signal by post-processing.
- the position sensitive detector 107 is controlled by a detector controller 157.
- a first electrode 108 may be provided for passing the charged particle beam 101 with high energy in the objective lens 106, in which case the first electrode is controlled by a first electrode controller 158.
- a second electrode 109 may be provided near the exit of the objective lens, in which case the second electrode 109 is controlled by a second electrode controller 159.
- the sample 110 is disposed on the sample stage 111, and the height, inclination and the like of the sample stage 111 are controlled by the stage controller 161.
- the integrated computer 170 controls the operation of the entire apparatus such as each controller, and constructs a charged particle beam image.
- the operator uses the controller 171 (keyboard, mouse, etc.) to input various conditions such as irradiation conditions of the charged particle beam 101, voltage conditions applied to each electrode, current conditions, stage position conditions, etc. to the integrated computer 170.
- the acquired secondary particle image and control screen are displayed on the display 172.
- a trajectory simulator 173 for calculating the trajectory of secondary particles emitted from the sample and a calculator 174 for analyzing the result of the trajectory simulator are provided.
- the integrated computer 170 may function as the trajectory simulator 173 and the computing unit 174.
- the charged particle beam apparatus has all the components necessary for the charged particle beam apparatus, such as a deflection system for scanning and shifting the charged particle beam 101. Also, each controller and computing unit can communicate with each other and are controlled by the integrated computer 170.
- the trajectory simulator reproduces the generation process of the backscattered electrons and secondary electrons generated by charged particles incident on the sample using random numbers, and repeatedly calculates the emission angle, energy, etc. of the backscattered electrons and secondary electrons by calculating repeatedly. Do. Monte Carlo simulation etc. are used for calculation. In order to carry out the simulation, the shape and composition of the sample 110, the incident condition of the charged particle beam 101, that is, the arrangement of each electrode, detector, etc. and the control condition of each controller are inputted.
- Control method of detector using trajectory simulator A control method of a detector using a trajectory simulator will be described with reference to FIG. The control method has the following steps.
- Step 1 Desired observation conditions such as the energy of the charged particle beam 101 to be irradiated to the sample and the lens condition of the objective lens 106 are determined, and are input to the trajectory simulator 173. For example, an acceleration voltage, an excitation current of an objective lens, and the like are input.
- Step 2 The condition of the secondary particle to be detected is determined and input to the trajectory simulator 173. For example, the energy range or angular range of secondary particles to be detected is determined. At that time, a spectrum 402 indicating the item 401 (for example, energy range of secondary particles, angle range, type of secondary particles such as secondary ions and secondary electrons) which determines the type of signal discrimination and the distribution of each signal It is convenient to have a GUI screen (FIG. 4) with an item 403 for selecting the range of secondary particles to be detected. As described above, when the item 403 for selecting the range of secondary particles to be detected is provided, the operator can detect only the region of the desired energy, so that more precise secondary particles can be detected.
- a GUI screen FIG. 4
- Step 3 The trajectory simulator 173 calculates the trajectory of the desired secondary particle under the desired observation conditions determined in step 2.
- Step 4 The arrival point of the secondary particle in the position sensitive detector 107 is determined.
- Step 5 Activate the element of the position sensitive detector that the desired secondary particle reaches.
- Step 6 Accumulate signals of active elements.
- Step 7 Construct an image based on the integrated signal.
- the operator can selectively detect a desired secondary particle and use this secondary particle to form a secondary particle image, thereby performing more detailed analysis of the sample. be able to.
- the elements to be activated may be set at a rate at which the desired secondary particles arrive. This will be described with reference to FIG.
- the control method has the following steps.
- Step 1 Desired observation conditions such as energy of charged particle beam to be irradiated to the sample and lens conditions of the objective lens are determined, and are input to the trajectory simulator 173. For example, an acceleration voltage, an excitation current of an objective lens, and the like are input.
- Step 2 The condition of the secondary particle to be detected is determined and input to the trajectory simulator 173. For example, the energy range or angular range of secondary particles to be detected is determined.
- Step 3 The trajectory simulator 173 calculates the trajectory of the desired secondary particle under the desired observation conditions determined in step 2.
- Step 4 The arrival point of the secondary particle in the position sensitive detector 107 is determined.
- Step 5 For the elements at each position of the position sensitive detector, calculate the ratio at which the desired secondary particles arrive (the desired amount of secondary particles with respect to the amount of all secondary signals incident on each element).
- Step 6 Determine a threshold of the ratio to be activated.
- an item 501 for determining the type of signal discrimination, a spectrum 502 indicating the distribution of each signal, an item 503 for selecting the range of secondary particles to be detected, and a detection element are activated.
- a GUI screen including an item 504 for determining a condition (threshold value) is provided, setting of the secondary particle to be acquired is easy and convenient.
- the display unit 505 indicates the ratio of the desired signal at each position, the display unit 506 indicates the detection efficiency of the desired signal, the display unit 507 indicates the detection efficiency for the entire signal, and the display unit 508 indicates the active element. It is more convenient to give guidance on threshold decision.
- Step 7 Accumulate signals of active elements.
- Step 8 Construct an image based on the integrated signal.
- control flow is not limited in the method of controlling the detector (or the computing unit that constructs an image) based on the result obtained by the trajectory simulator.
- the detector may be controlled using a database recording the position where the secondary particles reach or a database recording the conditions of the secondary particles to be detected.
- a CCD detector has been exemplified as the position sensitive detector 107, a method of directly detecting electrons by using a semiconductor detector arranged in a plane other than that, light emission by a scintillator, or the like via a lens or an optical fiber It is conceivable to use an optical camera or a photomultiplier tube for detection.
- position sensitive detectors were used, concentrically divided detectors, radially divided detectors, concentrically and radially divided detectors, and annularly arranged detectors You may apply to Importantly, the detector can be activated / inactivated at each position of the detection surface of the detector.
- the detector is disposed on the optical axis of the charged particle beam 101 in FIG. 1, the signal may be detected at a position away from the optical axis using an orthogonal electromagnetic field (E ⁇ B) or the like. It may be a detection system provided with an electrode for energy filtering. However, in that case, it is necessary to perform a simulation in consideration of a system that affects the trajectory of secondary particles, such as E ⁇ B or an electrode for energy filtering. In addition, also in a detection system using a conversion plate (a detection system that causes secondary particles to further collide with the conversion plate and detects tertiary particles emitted from the conversion plate), the trajectory of secondary particles colliding with the conversion plate is calculated. The same effect can be obtained by doing this.
- E ⁇ B orthogonal electromagnetic field
- the secondary particles emitted from the sample are described, in an apparatus that uses transmitted charged particles passing through the sample as a signal, such as a transmission electron microscope or a scanning transmission electron microscope (STEM), etc. It is useful. For example, extraction of a specific spot in a diffraction pattern and setting of a detector at the time of annular dark field (ADF) image acquisition can be easily performed.
- ADF annular dark field
- a display unit 601 for setting each element or range of the detector a detection efficiency display unit 602
- a spectrum display unit 604 for showing energy distribution and angular distribution of secondary particles to be detected desired signals
- a GUI screen provided with a display unit 605 indicating the rate at which the “” is detected, an item 606 for setting a desired signal, and the like.
- an electrostatic lens is formed between the first electrode 108 and the second electrode 109. That is, this embodiment has a magnetic field lens formed by the electrostatic lens and the objective lens 106 as a lens focused on a sample.
- the control method of the focusing lens in the present invention will be described using this focusing lens system.
- Step 1 Adjust the focus.
- Step 2 The objective lens and the electrostatic lens are interlocked and changed so that the focus point does not change. At this time, although the focus point does not change, the intensities of the objective lens 106 and the electrostatic lens change, so the trajectory of the secondary particles emitted from the sample changes. That is, the acquired image changes.
- Step 3 Acquire an image under each condition.
- Step 4 Compare the acquired images. For example, the acquisition condition of the brightest image is searched.
- Step 5 The searched condition is set as an observation condition.
- the brightest image is used as the determination criterion.
- an image with the largest change in contrast may be used, or attention may be focused only on the gradation of a specific area.
- comparison criteria for the purpose of determining the image acquisition conditions.
- this control flow can be implemented regardless of the type of detector. That is, the present invention is also applicable to a system including a detector having one element, a system including a plurality of detectors, and a system including an element division type detector.
- an electrostatic lens formed by the first electrode 108 and the second electrode 109 for passing the inside of the objective lens 106 with high energy is used, but for the purpose, an electrostatic lens is used. You may have it.
- the same control flow can be implemented also in the combination of the objective lens 106 and the second condenser lens 105.
- the combination of lenses may be either a magnetic field lens or both electrostatic lenses, or a magnetic field lens and an electrostatic lens mixture.
- the number of focusing lenses may be two as in this embodiment, or three or more.
- the observation conditions are determined by comparing the actually acquired images, but the detection efficiency under each observation condition is calculated using the trajectory simulator, and the observation conditions are determined based on the results. Good.
- the detection efficiency may be calculated by placing restrictions on the energy and emission angle of the secondary particles.
- the trajectory of the secondary particle can be changed without changing the focus point depending on the combination of the objective lens condition and the acceleration voltage condition. Therefore, by carrying out the same flow as the above flow, it is possible to search for an objective lens condition and an acceleration voltage condition suitable for observation.
- the distribution of secondary particles to be detected can be changed by moving the sample position to the focus point of the objective lens.
- the sample in the case of mounting two charged particle beam columns such as FIB-SEM apparatus, it is desirable that the sample be disposed at a position where the optical axes of the two charged particle beam columns intersect. Therefore, it is desirable that the focus point be constant.
- the present invention described in the above embodiments can provide a charged particle beam device capable of easily performing energy discrimination or angle discrimination of secondary particles emitted from a sample.
- a charged particle beam device capable of easily setting optimum observation conditions.
- the efficiency of processing and observation using the charged particle beam can be improved, and the operability can be improved.
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Abstract
Description
図1は、本発明の一実施例における荷電粒子線装置の概略図である。
軌道シミュレータについて詳細に説明する。軌道シミュレータは、試料に入射した荷電粒子によって発生する反射電子、二次電子の発生過程を乱数を用いて再現し、繰り返し計算を行うことにより反射電子、二次電子の放出角、エネルギー等を算出する。計算にはモンテカルロシミュレーション等が用いられる。シミュレーションを行うために、試料110の形状や組成、荷電粒子線101の入射条件、つまり、各電極、検出器等の配置や各制御器の制御条件が入力される。
軌道シミュレータを用いた検出器の制御方法を、図2を用いて説明する。制御方法は、以下のステップを有する。
本実施例では、第一電極108と第二電極109の間に静電レンズが形成される。即ち、本実施例は、試料に集束するレンズとして前記静電レンズと対物レンズ106が形成する磁場レンズを有する。ここでは、この集束レンズ系を用いて本発明における集束レンズの制御方法を説明する。
102 荷電粒子線源
103 加速電極
104 第一コンデンサーレンズ
105 第二コンデンサーレンズ
106 対物レンズ
107 位置敏感型検出器
108 第一電極
109 第二電極
110 試料
111 試料ステージ
153 加速電極制御器
154 第一コンデンサーレンズ制御器
155 第二コンデンサーレンズ制御器
156 対物レンズ制御器
157 検出器制御器
158 第一電極制御器
159 第二電極制御器
161 ステージ制御器
170 統合コンピュータ
171 コントローラ
172 ディスプレイ
173 軌道シミュレータ
174 演算器
401、501 信号弁別の種類を決定する項目
402、502 各信号の分布を示すスペクトル
403、503 検出する二次粒子の範囲を選択する項目
504 検出素子をアクティブにする条件(閾値)を決める項目
505 所望の信号の比率を示す表示部
506 所望の信号の検出効率を示す表示部
507 信号全体に対する検出効率を示す表示部
508 アクティブな素子を知らしめる表示部
601 検出器の各素子または範囲を設定する表示部
602 検出効率表示部
603 スペクトルを表示する際の横軸を設定する項目
604 検出される二次粒子のエネルギー分布や角度分布を示すスペクトル表示部
605 所望の信号が検出される割合を示す表示部
606 所望の信号を設定する項目
Claims (13)
- 荷電粒子線を放出する荷電粒子源と、
前記荷電粒子線を試料に集束するレンズと、
前記試料から放出された二次粒子を検出する検出器と、
前記試料から放出された二次粒子が到達する位置を計算する軌道シミュレータと、を備え、
所定の条件を満たす二次粒子の軌道を前記軌道シミュレータにより計算し、前記所定の条件を満たす二次粒子が前記検出器に到達する位置で検出された信号を用いて試料像を形成することを特徴とする荷電粒子線装置。 - 請求項1の荷電粒子線装置において、
前記二次粒子の所定の条件を設定する設定画面を表示する表示装置を備えたことを特徴とする荷電粒子線装置。 - 請求項1の荷電粒子線装置において、
前記検出器は、検出面の位置毎に素子が配列された位置敏感型検出器であることを特徴とする荷電粒子線装置。 - 請求項1の荷電粒子線装置において、
前記検出器は、検出面が分割された分割型検出器であることを特徴とする荷電粒子線装置。 - 請求項2の荷電粒子線装置において、
前記設定画面は、前記二次粒子のエネルギーを設定する設定画面を有することを特徴とする荷電粒子線装置。 - 請求項2の荷電粒子線装置において、
前記設定画面は、前記二次粒子の放出角の角度範囲を設定する設定画面を有することを特徴とする荷電粒子線装置。 - 請求項2の荷電粒子線装置において、
前記設定画面は、前記検出器の所定の位置における前記二次粒子の全検出量に対する所定の条件を満たす二次粒子の比率を設定する設定画面を有することを特徴とする荷電粒子線装置。 - 荷電粒子線を放出する荷電粒子源と、
前記荷電粒子線を試料に集束するレンズと、
前記試料から放出された二次粒子を検出する検出器と、
前記検出器によって検出される二次粒子の条件を記録したデータベースと、
所望の二次粒子の条件を設定する設定画面と、
前記設定画面を表示する表示装置と、を備えることを特徴とする荷電粒子線装置。 - 請求項8の荷電粒子線装置において、
前記データベースが、所定の条件を満たす二次粒子が到達する位置を記録し、
前記到達する位置で検出された信号を用いて試料像を形成することを特徴とする荷電粒子線装置。 - 請求項8の荷電粒子線装置において、
前記データベースが、前記検出器の各位置で検出される二次粒子の条件を記録し、
前記所望の二次粒子の条件と前記検出される二次粒子の条件が合致する位置で検出された信号を用いて試料像を形成することを特徴とする荷電粒子線装置。 - 請求項8の荷電粒子線装置において、
前記設定画面は、前記二次粒子のエネルギーを設定する設定画面を有することを特徴とする荷電粒子線装置。 - 請求項8の荷電粒子線装置において、
前記設定画面は、前記二次粒子の放出角の角度範囲を設定する設定画面を有することを特徴とする荷電粒子線装置。 - 請求項8の荷電粒子線装置において、
前記設定画面は、前記検出器の所定の位置における前記二次粒子の全検出量に対する所定の条件を満たす二次粒子の比率を設定する設定画面を有することを特徴とする荷電粒子線装置。
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US14/390,583 US9355814B2 (en) | 2012-04-03 | 2013-03-04 | Charged particle beam apparatus |
CN201380017972.5A CN104246966B (zh) | 2012-04-03 | 2013-03-04 | 带电粒子线装置 |
DE112013001373.8T DE112013001373B4 (de) | 2012-04-03 | 2013-03-04 | Mit einem Strahl geladener Teilchen arbeitende Vorrichtung |
JP2014509083A JP5909547B2 (ja) | 2012-04-03 | 2013-03-04 | 走査型荷電粒子線装置 |
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TWI608512B (zh) * | 2014-07-28 | 2017-12-11 | Hitachi Ltd | Charged particle beam device, simulation method and simulation device |
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- 2013-03-04 JP JP2014509083A patent/JP5909547B2/ja not_active Expired - Fee Related
- 2013-03-04 CN CN201380017972.5A patent/CN104246966B/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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CN104246966B (zh) | 2017-03-01 |
US9355814B2 (en) | 2016-05-31 |
US20150083910A1 (en) | 2015-03-26 |
JPWO2013150847A1 (ja) | 2015-12-17 |
DE112013001373B4 (de) | 2019-08-08 |
JP5909547B2 (ja) | 2016-04-26 |
DE112013001373T5 (de) | 2014-11-27 |
CN104246966A (zh) | 2014-12-24 |
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