WO2021100144A1 - ラメラの作製方法、解析システムおよび試料の解析方法 - Google Patents
ラメラの作製方法、解析システムおよび試料の解析方法 Download PDFInfo
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- WO2021100144A1 WO2021100144A1 PCT/JP2019/045433 JP2019045433W WO2021100144A1 WO 2021100144 A1 WO2021100144 A1 WO 2021100144A1 JP 2019045433 W JP2019045433 W JP 2019045433W WO 2021100144 A1 WO2021100144 A1 WO 2021100144A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/2202—Preparing specimens therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/2204—Specimen supports therefor; Sample conveying means therefore
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/225—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion
- G01N23/2251—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material using electron or ion using incident electron beams, e.g. scanning electron microscopy [SEM]
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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
- H01J37/30—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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/02—Details
- H01J2237/0203—Protection arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/20—Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated
- H01J2237/2007—Holding mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/20—Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated
- H01J2237/201—Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated for mounting multiple objects
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/20—Positioning, supporting, modifying or maintaining the physical state of objects being observed or treated
- H01J2237/208—Elements or methods for movement independent of sample stage for influencing or moving or contacting or transferring the sample or parts thereof, e.g. prober needles or transfer needles in FIB/SEM systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/30—Electron or ion beam tubes for processing objects
- H01J2237/317—Processing objects on a microscale
- H01J2237/3174—Etching microareas
- H01J2237/31745—Etching microareas for preparing specimen to be viewed in microscopes or analyzed in microanalysers
Definitions
- the present invention relates to a method for producing a lamella, an analysis system, and a method for analyzing a sample, in particular, a method for producing a lamella having a cut portion, an analysis system to which the lamella is applied, and a method for analyzing a sample to which the lamella is applied. Can be suitably used for.
- a lamella (thin sample) is prepared from a part of the wafer by a focused ion beam (FIB) device, and the lamella is transported to the lamella grid by the lamella transfer device or the above FIB device to obtain high-resolution electrons.
- a method of analyzing the lamella on the lamella grid is performed by a microscope.
- High-resolution electron microscopes include, for example, SEMs, transmission electron microscopes (TEMs) or scanning transmission electron microscopes (STEMs).
- Patent Document 1 discloses a technique for mounting a plurality of lamellas on one lamella grid by deposition.
- Patent Document 2 discloses a method using a fitting shape as a method for fixing a lamella without using deposition.
- Patent Document 1 it is possible to transport a large number of lamellas, and a plurality of lamellas are fixed to the lamella grid by using deposition.
- deposition has a problem that it takes time and a problem of sample contamination, a lamella fixing method that does not use deposition is desired in the quality evaluation of wafers.
- Patent Document 2 does not use deposition, so it can be transported in a short time and there is little sample contamination.
- it is necessary to increase the number of support portions by the number of lamellas to be transported.
- a generally used lamella grid having a diameter of about 3 mm only about 10 to 20 support portions can be provided. Therefore, it is difficult to transport a large number of lamellas by one lamella grid.
- FIG. 1 is a front view showing an outline of the lamella 10 and the lamella grid 20 examined by the inventors of the present application.
- 2 and 3 are perspective views of the main parts showing the lamella 10 and the lamella grid 20 of Study Example 1 and Study Example 2, and show the structure in the vicinity of the support portion 22, which is a region surrounded by a circle in FIG. There is.
- the lamella grid 20 includes a half-moon-shaped substrate 21 and a plurality of support portions 22 protruding from the surface of the substrate 21 in the Z direction, and each of the plurality of support portions 22 has a lamella. 10 is installed.
- one lamella 10 is mounted on one support portion 22.
- the support portion 22 is composed of columns 22a to 22d, and the columns 22a to 22d project from the upper surface of the substrate 21 in the Z direction.
- the lamella 10 is sandwiched between the support column 22a and the support column 22b, and between the support column 22c and the support column 22d. Further, an analysis unit 11 to be analyzed later in the charged particle beam apparatus is provided on the upper portion of the lamella 10.
- the method for producing a lamella in one embodiment includes a step of producing a lamella having an analysis part and a cutting part by etching a part of the wafer.
- the width of the lamella in the first direction is the width of the lamella in the second direction orthogonal to the first direction, and the width of the lamella in the first direction and the third direction orthogonal to the second direction. It is smaller than the width, and in the first direction, the width of the analysis unit is smaller than the width of the lamella around the analysis unit.
- the cutting portion is formed by a hole penetrating the lamella in the first direction, and the analysis portion and the cutting portion are separated from each other in the second direction.
- the analysis system in one embodiment includes a lamella manufacturing mechanism and a lamella transport mechanism, and (a) in the lamella manufacturing mechanism, by etching a part of the wafer, at least the first analysis unit and the first analysis unit and the first analysis system are provided.
- the width of the first lamella in the first direction is the width of the first lamella in the second direction orthogonal to the first direction, and the width of the first lamella and the third direction orthogonal to the first direction and the second direction.
- the width of the first analysis unit is smaller than the width of the first lamella in the first direction, and the width of the first analysis unit is smaller than the width of the first lamella around the first analysis unit.
- the first cutting portion is composed of holes penetrating the first lamella in the first direction, and in the second direction, the first analysis portion and the first cutting portion are separated from each other, and the said The width of the second lamella in the first direction is smaller than the width of the second lamella in the second direction and the width of the second lamella in the third direction. Further, in the first direction, the width of the second analysis unit is smaller than the width of the second lamella around the second analysis unit, and the second cutting portion is the second in the first direction. It is composed of holes penetrating the lamella, and in the second direction, the second analysis unit and the second cutting unit are separated from each other.
- the lamella grid has a substrate and a support portion that protrudes from the surface of the substrate in the second direction and can mount the first lamella and the second lamella, and in the step (b).
- the first lamella and the second lamella are such that the second cutting section and the first analysis section are adjacent to each other in the second direction and overlap in a plan view seen from the second direction. Transported to the lamella grid.
- the method for analyzing a sample in one embodiment is performed using a transmission electron microscope, and (a) a step of placing the sample having an analysis target portion on a sample stage of the transmission electron microscope, (b) the above.
- an image of the sample is acquired at a low magnification, and the position of the analysis target portion of the sample is specified based on the image. It has a step of performing an analysis of the analysis target portion of the sample.
- the image acquired in the step (b) includes a dark region and a bright region surrounded by the dark region, and the bright region is smaller than the first region and the first region.
- a plurality of lamellas can be conveyed by one lamella grid, and the throughput of wafer quality evaluation can be improved. At that time, a lamella that suppresses damage to the analysis unit can be produced. Further, it is possible to provide an analysis system capable of producing and transporting such a lamella. Further, in the method of analyzing a sample to which such a lamella is applied, a more accurate observation image can be obtained.
- FIG. It is a schematic diagram which shows the lamella production mechanism in Embodiment 1.
- FIG. It is a schematic diagram which shows the lamella transport mechanism in Embodiment 1.
- FIG. It is a schematic diagram which shows the lamella analysis mechanism in Embodiment 1.
- FIG. It is a schematic diagram which shows the network configuration in Embodiment 1.
- FIG. It is a processing flow diagram of the analysis system in Embodiment 1.
- FIG. It is a main part perspective view which shows the manufacturing method of the lamella in Embodiment 1.
- FIG. It is a main part perspective view which shows the manufacturing method of the lamella following FIG.
- FIG. is a main part perspective view which shows the manufacturing method of the lamella following FIG.
- FIG. It is a main part perspective view which shows the transport method of the lamella in Embodiment 1.
- FIG. It is a main part perspective view which shows the transport method of the lamella following FIG. It is a main part perspective view which shows the transport method of the lamella following FIG. It is a main part perspective view which shows the transport method of the lamella following FIG. It is a main part perspective view which shows the transport method of the lamella following FIG. It is a front view for demonstrating the analysis method of the lamella in Embodiment 1.
- FIG. This is an example of an image for explaining the method of analyzing the lamella in the first embodiment.
- the X direction, the Y direction, and the Z direction described in the present application are orthogonal to each other.
- the Z direction may be described as an upward direction or a height direction of a certain structure.
- the planes formed by the X direction and the Y direction form a plane, which is a plane perpendicular to the Z direction.
- the plane consisting of the Y direction and the Z direction forms a plane, which is a plane perpendicular to the X direction.
- the plane consisting of the X direction and the Z direction forms a plane, and is a plane perpendicular to the Y direction.
- plane view viewed from the Y direction it means that the plane consisting of the X direction and the Z direction is viewed from the Y direction.
- FIG. 4 is a perspective view of a main part showing how two lamellas 10 are mounted on the lamella grid 20
- FIGS. 5 to 7 are a perspective view of the main part showing the structure of one lamella 10, a front view, and a front view. It is a plan view.
- the lamella grid 20 can be equipped with a plurality of three or more lamellas 10.
- the lamella grid (TEM grid, lamella carrier) 20 includes a half moon type substrate 21 and a plurality of support portions (gap portions) 22 protruding from the surface of the substrate 21 in the Z direction.
- a plurality of lamellas 10 are mounted on each of the plurality of support portions 22.
- the substrate 21 including the plurality of support portions 22 may be made of one material such as silicon, but the portion of the substrate 21 where the plurality of support portions 22 are provided and the periphery thereof are the substrate 21. It may be composed of a material different from the material constituting the above. For example, most of the substrate 21 may be made of copper, and the plurality of support parts 22 and their surroundings may be made of silicon.
- the support portion 22 is composed of columns 22a to 22d, and the columns 22a to 22d project from the surface of the substrate 21 in the Z direction and extend in the Z direction.
- the lamella 10 is supported by a support portion 22 forming a gap portion. Specifically, the lamella 10 is sandwiched between the support column 22a and the support column 22b, and between the support column 22c and the support column 22d.
- the support portion 22 can support a plurality of lamellas 10, and here two lamellas 10 are adjacent to each other in the Z direction and are supported by the support portion 22.
- the columns 22a and 22b are separated from each other in the Y direction, and the columns 22c and 22d are separated from each other in the Y direction. Further, the support column 22a and the support column 22b are separated from the support column 22c and the support column 22d in the X direction.
- One lamella grid 20 is provided with 4 to 20 support portions 22 composed of such columns 22a to 22d.
- the columns 22a to 22d are square columns is illustrated, but the shapes of the columns 22a to 22d may be any shape that can hold the lamella 10, and are polygonal columns other than the square. It may be a cylindrical body or a cylindrical body.
- the lamella 10 is a flaky sample whose width in the Y direction is thinner than the width in the X direction and the width in the Z direction, and is a part of the wafer 1 as will be described later. Is produced by etching.
- An analysis unit 11 is provided above the lamella 10 in the Z direction.
- the analysis unit 11 is a region to be analyzed later in the lamella analysis mechanism, and the width of the analysis unit 11 is thinner than the width of the lamella 10 around it in the Y direction.
- the lamella 10 is mounted on the lamella grid 20 so that the analysis unit 11 does not overlap the support portions 22 (supports 22a to 22d) in a plan view viewed from the Y direction.
- a cutting portion 12 is provided below the lamella 10 in the Z direction so as to be separated from the analysis portion 11.
- the cutting portion 12 is composed of holes penetrating the lamella 10 in the Y direction.
- the width W2 of the cutting unit 12 is larger than the width W1 of the analysis unit 11.
- the analysis unit 11 is provided so as to overlap the cutting unit 12 in a plan view viewed from the Z direction. In other words, the analysis unit 11 is included in the cutting unit 12 when viewed in a plan view from the Z direction.
- the plurality of lamellas 10 are sequentially conveyed to the lamella grid 20 so as to be adjacent to each other in the Z direction. Further, the cutting portion 12 of the upper lamella 10 and the analysis portion 11 of the lower lamella 10 are adjacent to each other in the Z direction and overlap each other in the plan view seen from the Z direction. Since the cutting portion 12 is provided on the lamella 10 in this way, the upper lamella 10 does not come into contact with the analysis portion 11 of the lower lamella 10.
- the lamella 10 in the first embodiment is used, a plurality of lamella 10 can be mounted on the lamella grid 20, and the problem that the analysis unit 11 is damaged can be suppressed. Further, in the first embodiment, since the deposition is not used at the time of mounting on the lamella grid 20, the transport can be performed in a short time and the sample contamination is small.
- the analysis when performing analysis in the lamella analysis mechanism, the analysis is performed in a state where a plurality of lamellas 10 are mounted on the lamella grid 20. Therefore, the analysis unit 11 does not overlap the support unit 22 and is exposed from the support unit 22 in a plan view viewed from the Y direction so that the analysis unit 11 is not blocked by the support unit 22. Further, when viewed from the Y direction in a plan view, the cutting portion 12 does not overlap the support portion 22 and is exposed from the support portion 22, but if the analysis unit 11 does not overlap the support portion 22, the cutting portion 12 is not overlapped. A part of may overlap the support portion 22.
- the lamella 10 located at the lowermost part of the lamella grid 20 does not have another lamella 10 (analysis unit 11) below the lamella grid 20, so that the lowermost lamella 10 does not have to be provided with the cutting portion 12.
- the step of manufacturing the lamella 10 becomes complicated. Further, since it is necessary to first transport the lamella 10 having no cutting portion 12 and the transport order is limited, the process of transporting the lamella 10 becomes complicated. Therefore, it is most desirable to provide the cutting portion 12 in all the lamellas 10.
- FIG. 8 is a schematic diagram showing the analysis system 30 according to the first embodiment.
- the analysis system 30 has a lamella production mechanism, a lamella transport mechanism, and a lamella analysis mechanism.
- a lamella production device 40 is used as the lamella production mechanism
- a lamella production device 40 or a lamella transfer device 60 is used as the lamella transfer mechanism
- a lamella analysis device is used as the lamella analysis mechanism. 70 is used.
- the analysis system 30 receives the wafer 1 from the semiconductor production line 2, and returns the wafer 1 after the production and transfer of the lamella 10 to the semiconductor production line 2.
- the production of the lamella 10 is performed by the lamella production device 40, and the transfer of the lamella 10 to the lamella grid 20 is performed by the lamella production device 40 or the lamella transfer device 60.
- the analysis of the lamella 10 is performed by the lamella analyzer 70, and the analysis result of the lamella 10 is provided as the analysis data D4.
- the wafer 1, the lamella 10, and the lamella grid 20 are filled with an inert gas such as nitrogen. It is stored inside a container (FOUP) and taken out of the container inside each device after the transfer is completed.
- FOUP container
- the wafer 1 in the first embodiment is formed on a semiconductor substrate on which a p-type or n-type impurity region is formed, a semiconductor element such as a transistor formed on the semiconductor substrate, and the semiconductor element. It is composed of a wiring layer and the like. Since the lamella 10 is a thin piece obtained from a part of the wafer 1, the structure of the lamella 10 includes all or a part of the semiconductor substrate, the semiconductor element, and the wiring layer. Further, in the first embodiment, the wafer 1 mainly used in the semiconductor production line is described, but the wafer 1 may be a structure used other than the semiconductor technology.
- lamella manufacturing apparatus 40 The detailed structures of the lamella manufacturing apparatus 40, the lamella transport apparatus 60, and the lamella analysis apparatus 70, which are the main components of the analysis system 30, will be described below.
- FIG. 9 is a schematic view showing the lamella manufacturing apparatus 40 according to the first embodiment.
- the lamella production device 40 includes at least a lamella production mechanism, and is composed of a charged particle beam device such as a FIB-SEM device.
- the lamella manufacturing apparatus 40 includes an ion beam column 41, an electron beam column 42, a sample chamber 43, a wafer stage 44, a wafer retainer 45, a charged particle detector 46, a detacher 47, a lamella grid stage 48, a lamella grid retainer 49, and various controls. Parts C1 to C7 are provided. Further, an input device 50 and a display 51 are provided inside or outside the lamella manufacturing apparatus 40.
- the ion beam column 41 includes an ion source for generating an ion beam (charged particle beam) IB, a lens for focusing the ion beam IB, a deflection system for scanning and shifting the ion beam IB, and the like. , Includes all components required as a FIB device.
- Gallium ions are generally used as the ion beam IB, but the ion species may be appropriately changed depending on the purpose of processing and observation. Further, the ion beam IB is not limited to the focused ion beam, and may be a broad ion beam.
- the ion beam column control unit C1 controls the ion beam column 41. For example, the generation of the ion beam IB from the ion source and the driving of the deflection system are controlled by the ion beam column control unit C1.
- the electron beam column 42 includes an electron source for generating an electron beam (charged particle beam) EB1, a lens for focusing the electron beam EB1, and a deflection system for scanning and shifting the electron beam EB1. , Includes all components required as an SEM device.
- the electron beam column control unit C2 controls the electron beam column 42. For example, the generation of the electron beam EB1 from the electron source and the driving of the deflection system are controlled by the electron beam column control unit C2.
- the ion beam IB that has passed through the ion beam column 41 and the electron beam EB1 that has passed through the electron beam column 42 are mainly crosspoint CP1 that is an intersection of the optical axis OA1 of the ion beam column and the optical axis OA2 of the electron beam column. Is focused on.
- the ion beam column 41 is arranged vertically and the electron beam column 42 is arranged in an inclined manner, but the present invention is not limited to this, and the ion beam column 41 is arranged in an inclined manner and the electron beam column 42 is arranged vertically. It may be arranged. Further, both the ion beam column 41 and the electron beam column 42 may be inclined.
- the ion beam column 41 and the electron beam column 42 may be composed of a triple column provided with a gallium focused ion beam column, an argon focused ion beam column and an electron beam column instead of these.
- the lamella manufacturing apparatus 40 may include only the ion beam column 41 or may include only the electron beam column 42.
- the lamella manufacturing apparatus 40 which is a charged particle beam apparatus, may be provided with either or both of the ion beam column 41 and the electron beam column 42.
- the charged particle beam device may be provided with a charged particle beam column.
- the electron beam column 42 is not limited to the SEM device, and may be a TEM device or a STEM device for observing using electrons that have passed through the sample.
- the wafer stage 44 is provided in the sample chamber 43 at a position where the wafer 1 is irradiated with the ion beam IB and the electron beam EB1.
- the drive of the wafer stage 44 is controlled by the wafer stage control unit C3. Therefore, the wafer stage 44 can perform planar movement, vertical movement, rotational movement, and tilt movement.
- the wafer stage 44 is provided with a wafer retainer 45 for fixing the wafer 1, and the wafer 1 is fixed to the wafer stage 44 via the wafer retainer 45.
- the wafer stage 44 is moved so that, for example, a desired portion on the wafer 1 is located at the irradiation position of the ion beam IB or the irradiation position of the electron beam EB1.
- the charged particle detector 46 detects charged particles generated when the wafer 1 or the lamella 10 is irradiated with the ion beam IB and the electron beam EB1. Further, the lamella manufacturing apparatus 40 may be provided with a composite charged particle detector capable of detecting not only electrons but also ions as the charged particle detector 46.
- the detector control unit C4 controls the charged particle detector 46.
- the detector control unit C4 includes a circuit or an arithmetic processing unit that arithmetically processes and images the detection signal from the charged particle detector 46.
- the detachable device 47 is provided in the sample chamber 43 so that the detachable device 47 can reach the position where the ion beam IB and the electron beam EB1 are irradiated.
- the drive of the detachable device 47 is controlled by the detachable device control unit C5.
- the detachable device 47 can perform planar movement, vertical movement, and rotational movement.
- the attachment / detachment device 47 may be a microprobe. In that case, the microprobe is also controlled by the attachment / detachment control unit C5.
- the lamella grid stage 48 is provided with a lamella grid retainer 49 for fixing the lamella grid 20, and the lamella grid 20 is fixed to the lamella grid stage 48 via the lamella grid retainer 49.
- the drive of the lamella grid stage 48 is controlled by the lamella grid stage control unit C6. Therefore, the lamella grid stage 48 can perform planar movement, vertical movement, rotational movement, and tilt movement.
- the lamella 10 is taken out from the wafer 1 by the detachable device 47 and conveyed to the lamella grid 20.
- the integrated control unit C7 can communicate with each other of the ion beam column control unit C1, the electron beam column control unit C2, the wafer stage control unit C3, the detector control unit C4, the attachment / detachment control unit C5, and the lamella grid stage control unit C6. It controls the operation of the entire lamella manufacturing apparatus 40.
- the integrated control unit C7 controls each of the control units C1 to C6 according to an instruction from the user by the input device 50 or a preset condition, and the pattern is written or analyzed on the wafer 1 on each of the control units C1 to C6. Have them observe.
- the integrated control unit C7 includes a storage unit (not shown) for storing information and the like received from the control units C1 to C6 of the lamella manufacturing apparatus 40.
- control units C1 to C6 are individually shown near the control targets related to each, but the control units C1 to C6 and the integrated control unit C7 are one. It may be grouped as a control unit. Therefore, in the present application, the control unit having all or a part of the control units C1 to C7 may be simply referred to as a "control unit". It should be noted that such a mode is the same for the control units C2 to C6 and C8, which will be described later, and the control units C9 to C14.
- the user inputs instructions such as inputting information to be analyzed, changing the irradiation conditions of the ion beam IB and the electron beam EB1, and changing the positions of the wafer stage 44 and the lamella grid stage 48.
- the input device 50 is, for example, a keyboard or a mouse.
- the GUI screen 52 and the like are displayed on the display 51.
- the GUI screen 52 is a screen for controlling each configuration of the lamella manufacturing apparatus 40.
- the display 51 displays, for example, a screen for inputting information to be analyzed, a screen showing the state of each configuration of the lamella manufacturing apparatus 40, and information (including an image) to be analyzed acquired by observation.
- a screen, an instruction screen for changing the irradiation conditions of the ion beam IB and the electron beam EB1, an instruction screen for changing the positions of the wafer stage 44 and the lamella grid stage 48, and the like can be displayed.
- One display 51 may be provided, or a plurality of displays 51 may be provided.
- the display 51 may have the function of the input device 50 such as a touch panel.
- the sample chamber 43 may be equipped with a gas deposition unit (not shown). Each gas deposition unit has a control unit that controls its drive. The gas deposition unit is used to prepare or mark a protective film on a wafer 1 and stores depot gas that forms a deposit film by irradiation with charged particle beams. Depot gas can be supplied from the tip of the nozzle as needed.
- the sample chamber 43 may be equipped with a decompression device for vacuum exhaust, a cold trap, an optical microscope, or the like. Further, the sample chamber 43 may be equipped with a detector such as a tertiary electron detector, a STEM detector, a backscattered electron detector or a low energy loss electron detector.
- the lamella manufacturing apparatus 40 has a lamella manufacturing mechanism for manufacturing a plurality of lamellas 10 from the wafer 1 and a lamella transport mechanism for transporting (mounting) the plurality of lamellas 10 to the lamella grid 20. ..
- the lamella grid 20 on which the lamella 10 is mounted is transferred to the lamella analysis device 70 without going through the lamella transfer device 60 described later.
- the lamella manufacturing apparatus 40 does not have to include the lamella transport mechanism. That is, the lamella manufacturing apparatus 40 may not include the attachment / detachment device 47, the attachment / detachment control unit C5, the lamella grid stage 48, the lamella grid retainer 49, and the lamella grid stage control unit C6 as constituent elements.
- the lamella transport mechanism is included in the lamella transport device 60. Since a large amount of time is required to prepare the lamella 10 as compared with the transportation of the lamella 10, it is more efficient to transport the lamella 10 in the lamella transport device 60.
- a plurality of lamella manufacturing devices 40 are prepared as a plurality of lamella manufacturing mechanisms in the analysis system 30, and a large number of lamellas 10 are manufactured from the plurality of wafers 1 in the plurality of lamella manufacturing devices 40.
- a plurality of lamellas 10 are sequentially transported from the wafer 1 processed by a certain lamella manufacturing device 40 to the lamella grid 20.
- FIG. 10 is a schematic view showing the lamella transport device 60 according to the first embodiment.
- the lamella transport device 60 includes at least a lamella transport mechanism, and is composed of a charged particle beam device such as an SEM device including, for example, two electron beam columns. Since many components of the lamella transport device 60 are the same as those of the lamella manufacturing device 40, detailed description thereof will be omitted here.
- the lamella transport device 60 is configured by replacing the ion beam column 41 and the ion beam column control unit C1 of the lamella production device 40 with another electron beam column 61 and another electron beam column control unit C8.
- the electron beam column 61 scans the electron source for generating the electron beam (charged particle beam) EB2, the lens for focusing the electron beam EB2, and the electron beam EB2. , Includes all the components required for an SEM device, such as a deflection system for shifting.
- the electron beam column control unit C8 controls the electron beam column 61. For example, the generation of the electron beam EB2 from the electron source and the driving of the deflection system are controlled by the electron beam column control unit C8.
- the electron beam EB1 that has passed through the electron beam column 42 and the electron beam EB2 that has passed through the electron beam column 61 are mainly crosses that are intersections of the optical axis OA2 of the electron beam column 42 and the optical axis OA3 of the electron beam column 61. Focus is on point CP2. Since the lamella transport device 60 includes the electron beam column 42 and the electron beam column 61, the wafer 1 and the lamella grid 20 can be confirmed from two directions.
- two electron beam columns are used, but if the images of the wafer 1 and the lamella grid 20 can be observed from two directions, an ion beam column can be used instead of the two electron beam columns.
- Optical microscope or laser microscope may be used.
- the lamella transport device 60 has a lamella transport mechanism for transporting (mounting) the lamella 10 onto the lamella grid 20.
- the wafer 1 on which the lamella 10 is manufactured is transferred from the lamella manufacturing apparatus 40 to the lamella transport device 60, and the lamella grid 20 on which the lamella 10 is mounted is transferred from the lamella transport device 60. It is transferred to the lamella analyzer 70.
- the lamella grid stage 48 in the lamella transport device 60 is also provided with a lamella grid retainer 49 for fixing the lamella grid 20, and the lamella grid 20 is fixed to the lamella grid stage 48 via the lamella grid retainer 49.
- the drive of the lamella grid stage 48 is controlled by the lamella grid stage control unit C6. Therefore, the lamella grid stage 48 can perform planar movement, vertical movement, rotational movement, and tilt movement.
- a plurality of lamellas 10 are taken out from the wafer 1 by the attachment / detachment device 47, and at the lamella grid stage 48, the plurality of lamellas 10 are sequentially conveyed to the lamella grid 20 by the attachment / detachment device 47.
- the lamella producing device 40 can include the lamella transport mechanism, but by dedicating the lamella transport device 60 as the lamella transport mechanism, the throughput of wafer quality evaluation can be improved.
- FIG. 11 is a schematic view showing the lamella analyzer 70 according to the first embodiment.
- the lamella analysis device 70 includes at least a lamella analysis mechanism, and is composed of a charged particle beam device such as a TEM device or a STEM device.
- the lamella analyzer 70 includes an electron beam column 71, a sample stage 72, a sample exchange chamber 73, a charged particle detector 74, a charged particle detector 75, an X-ray detector 76, a sample chamber 77, and control units C9 to C14. .. Further, an input device 78 and a display 79 are provided inside or outside the lamella analysis device 70.
- the sample SAM can be installed on the sample stage 72.
- the sample SAM includes a plurality of lamellas 10 and a lamella grid 20 as shown in FIG. 4, and the substance and structure of the analysis unit 11 of the lamella 10 are analyzed by the lamella analyzer 70.
- the sample SAM is installed sideways so that the front surface of the analysis unit 11 in FIG. 4 faces the electron beam column 71 in the Y direction.
- the electron beam column 71 is required as a TEM device or a STEM device, such as an electron source for generating an electron beam, a lens for focusing the electron beam, and a deflection system for scanning and shifting the electron beam. Includes all components.
- the electron beam that has passed through the electron beam column 71 irradiates the sample SAM.
- the electron beam column control unit C9 controls the electron beam column 71. Specifically, the generation of the electron beam by the electron source of the electron beam column 71 and the driving of the deflection system are controlled by the electron beam column control unit C9.
- the electron beam column 71 is arranged perpendicularly to the sample SAM, but the present invention is not limited to this, and the electron beam column 71 is inclined with respect to the sample SAM. It may be arranged so as to be.
- the sample stage 72 is provided in the sample chamber 77 so that the sample SAM can be irradiated with an electron beam.
- the sample exchange chamber 73 is a place for exchanging the sample SAM inserted into the sample chamber 77.
- the drive of the sample stage 72 is controlled by the sample stage control unit C10, and the sample stage 72 can be moved in a plane, vertically, or rotated. By driving the sample stage 72, the position and orientation of the sample SAM can be changed. For example, the sample stage 72 is moved so that the sample SAM is positioned at the irradiation position of the electron beam.
- the charged particle detector 74 and the charged particle detector 75 detect the charged particles generated when the sample SAM is irradiated with the electron beam.
- a composite charged particle detector capable of detecting not only electrons but also ions may be used.
- the detector control unit C11 controls the charged particle detector 74, and the detector control unit C12 controls the charged particle detector 75.
- the detector control unit C11 and the detector control unit C12 include a circuit or an arithmetic processing unit (not shown) that arithmetically processes and images the detection signal.
- the X-ray detector 76 detects the X-rays emitted by the sample SAM.
- a mass spectrometer may be mounted instead of the X-ray detector 76.
- the X-ray detector control unit C13 controls the X-ray detector 76.
- the X-ray detector control unit C13 includes a circuit or an arithmetic processing unit (not shown) that arithmetically processes and images the detection signal from the X-ray detector 76.
- the sample chamber 77 may be equipped with a decompression device for vacuum exhaust, a cold trap, an optical microscope, or the like. Further, the sample chamber 77 may be equipped with a detector such as a tertiary electron detector, a STEM detector, a backscattered electron detector or a low energy loss electron detector.
- a detector such as a tertiary electron detector, a STEM detector, a backscattered electron detector or a low energy loss electron detector.
- the integrated control unit C14 can communicate with each of the electron beam column control unit C9, the sample stage control unit C10, the detector control units C11 and C12, and the X-ray detector control unit C13, and operates the entire lamella analysis device 70. To control.
- the integrated control unit C14 controls each of the above control units according to an instruction from the user by the input device 78 or according to preset conditions, and causes the sample SAM to be analyzed and the like. Further, the integrated control unit C14 includes a storage unit (not shown) for storing information and the like received from each control unit of the lamella analysis device 70.
- the input device 78 is a device for the user to input instructions such as changing the irradiation conditions of the electron beam or changing the position of the sample stage 72.
- the input device 78 is, for example, a keyboard or a mouse.
- the GUI screen 80 and the like are displayed on the display 79.
- the GUI screen 80 is a screen for controlling the lamella analysis device 70.
- the display 79 is a GUI screen 80, for example, a screen showing the state of each configuration of the lamella analysis device 70, a screen displaying sample information (including an image) acquired by the analysis, and information on the sample SAM obtained by the analysis.
- a screen for inputting an image, an instruction screen for changing the irradiation conditions of the electron beam, an instruction screen for changing the position of the sample stage 72, and the like can be displayed.
- One display 79 may be provided, or a plurality of displays 79 may be provided.
- the display 79 may have the function of an input device 78 such as a touch panel.
- FIG. 12 is a schematic diagram showing the network configuration 31 of the analysis system 30.
- the semiconductor manufacturing line 2, the lamella manufacturing apparatus 40, the lamella transport apparatus 60, the lamella analysis apparatus 70, and the server SV that manages data are electrically connected by a network 32. Therefore, various data can be exchanged between them.
- the server SV can hold the analysis position data D1, the lamella production position data D2, the lamella transport position data D3, and the analysis data D4.
- the analysis position data D1 is data indicating a position on the wafer 1 where the cross-section analysis is scheduled to be performed.
- the lamella production position data D2 is data indicating a position on the wafer 1 where the lamella 10 has been successfully produced.
- the lamella transport position data D3 is data indicating the position of the lamella 10 transported on the lamella grid 20.
- the analysis data D4 is data including the analysis result, and is data including a detection signal of charged particles or X-rays from the sample SAM irradiated with the electron beam, an observation image obtained from the detection signal, and the like.
- analysis position data D1, the lamella production position data D2, the lamella transport position data D3, and the analysis data D4 are associated with their respective information. That is, it is possible to know at which position on the lamella grid 20 the lamella 10 produced at a predetermined position on the wafer 1 is mounted, and what the analysis result of the lamella 10 is.
- FIG. 13 is a processing flow diagram of the analysis system 30 according to the first embodiment.
- 14 to 16 are perspective views of a main part showing a method of manufacturing a lamella by a lamella manufacturing mechanism
- FIGS. 17 to 21 are perspective views of a main part showing a method of transporting lamella by a lamella transport mechanism.
- step S1 the wafer 1 whose cross-section analysis is to be performed is transferred from the semiconductor manufacturing line 2 to the lamella manufacturing apparatus 40, and the wafer 1 is installed on the wafer stage 44 of the lamella manufacturing apparatus 40.
- step S2 the lamella manufacturing apparatus 40 acquires the analysis position data D1 corresponding to the received wafer 1 from the server SV.
- step S3 the wafer stage 44 is moved to the analysis position based on the analysis position data D1. Then, as shown in FIGS. 14 to 16, the lamella 10 is manufactured from a part of the wafer 1.
- the periphery of the region to be cross-sectionally analyzed on the wafer 1 is etched by a charged particle beam such as an ion beam IB to prepare the outer shape of the lamella 10.
- the analysis unit 11 is produced on the upper part of the lamella 10 by etching a part of the lamella 10.
- the analysis unit 11 is subjected to a finished surface treatment or the like for later analysis.
- the lamella 10 is connected to the wafer 1 by the connection point 1a.
- the lamella 10 the connection point 1a and the wafer 1 are integrated, and the lamella 10 is separated from the connection point 1a when the lamella 10 is conveyed.
- the bottom of the lamella 10 is etched by inclining the wafer stage 44 and irradiating it with a charged particle beam such as an ion beam IB.
- a charged particle beam such as an ion beam IB.
- the cutting portion 12 of the lamella 10 is produced.
- the structure of the lamella 10 in this state is the same as the structure described with reference to FIGS. 5 to 7 described above, except for the connection portion 1a. Therefore, for the detailed structure of the lamella 10, refer to the above description of FIGS. 5 to 7.
- the cutting portion 12 is etched after the lamella 10 shown in FIG. 14 is manufactured, but the cutting portion 12 may be etched during the manufacturing process of FIG.
- step S3 is repeated until the production of all the lamellas 10 corresponding to the analysis position data D1 is completed.
- step S4 among all the lamellas 10 produced in step S3, the positions of the plurality of lamellas 10 that have been successfully produced are transmitted to the server SV and stored in the server SV as lamella production position data D2.
- step S5 the wafer 1 on which a plurality of lamellas 10 are manufactured is transferred from the lamella manufacturing apparatus 40 to the lamella transporting apparatus 60. That is, the wafer 1 is transferred from the lamella manufacturing mechanism to the lamella transport mechanism.
- the lamella production apparatus 40 has a lamella production mechanism and a lamella transport mechanism, the steps related to step S5 and the following steps S6 to S9 are performed by the lamella production apparatus 40.
- step S6 the lamella transport device 60 acquires the lamella production position data D2 corresponding to the received wafer 1 from the server SV.
- step S7 the wafer stage 44 is moved to the lamella manufacturing position based on the lamella manufacturing position data D2. After that, as shown in FIGS. 17 to 21, a plurality of lamellas 10 are conveyed to the lamella grid 20.
- the lamella transport device 60 the image formed by the electron beam column 42 or the electron beam column 61 is confirmed, and then, as shown in FIG. 17, the lamella 10 produced on the wafer 1 using the attachment / detachment device 47 is used.
- the attachment / detachment device 47 is nano tweezers, and the lamella 10 is gripped by the nano tweezers. At this time, it is desirable to operate the nano tweezers so that the analysis unit 11 is not grasped.
- the lamella 10 is separated from the connection point 1a and lifted off from the wafer 1. In this way, the lamella 10 is obtained from a part of the wafer 1.
- the lamella grid stage 48 is moved to a position where an image can be acquired by the electron beam column 42 and the electron beam column 61, and the positions of the detachable device 47 and the lamella grid stage 48 are adjusted. Then, as shown in FIG. 19, the lamella 10 held by the detachable device 47 is moved directly above the support portions 22 (supports 22a to 22d) on the lamella grid 20.
- the lamella 10 is inserted into the support portion 22 as shown in FIG. Specifically, the lamella 10 is inserted between the support column 22a and the support column 22b, and between the support column 22c and the support column 22d. After the insertion of the lamella 10 to a predetermined position is completed, the attachment / detachment device 47 is released from the grip and the attachment / detachment device 47 is retracted. As described above, the first lamella 10 is conveyed from the wafer 1 to the lamella grid 20.
- the second lamella 10 is obtained from the wafer 1 by the same method as the first wafer. Then, as shown in FIG. 21, the second lamella 10 is moved directly above the support portion 22 of the lamella grid 20, and the lamella 10 is inserted into the support portion 22. As a result, the second lamella 10 is conveyed from the wafer 1 to the lamella grid 20.
- the cutting portion 12 is provided in the lamella 10
- the bottom portion of the upper lamella 10 does not come into contact with the analysis portion 11 of the lower lamella 10. Therefore, it is possible to suppress the problem that the analysis unit 11 is damaged.
- a plurality of lamellas 10 can be mounted on the support portion 22, and a lamella grid 20 having a plurality of such support portions 22 can be provided. Further, when the lamella 10 is transported to the lamella grid 20, since no deposition is used, the lamella 10 can be transported in a short time, and sample contamination can be suppressed.
- two lamellas 10 are mounted on the support portion 22, but depending on the shape (height) of the support portion 22, two or more lamellas 10 are mounted on the support portion 22. It is also possible to make it.
- step S7 is repeated until the transfer of all the lamellas 10 corresponding to the lamella production position data D2 is completed. Further, when the permissible range of one support portion 22 is exceeded, the subsequent lamella 10 is conveyed to the other support portion 22 on the lamella grid 20. Then, when the permissible range of one lamella grid 20 is exceeded, the subsequent lamella 10 is further conveyed to the support portion 22 of the other lamella grid 20.
- step S8 among the lamellas 10 transported to the lamella grid 20, the positions of the lamellas 10 successfully transported on the lamella grid 20 are transmitted to the server SV and used as the lamella transport position data D3. It is saved in the server SV.
- step S9 the wafer 1 in which the transfer of the plurality of lamellas 10 is completed is discharged from the lamella transfer device 60. After that, if necessary, the discharged wafer 1 may be returned to the semiconductor production line 2.
- step S10 the lamella grid 20 on which the plurality of lamellas 10 are mounted is transferred from the lamella transport device 60 to the lamella analysis device 70 as a sample SAM.
- step S11 the lamella analysis device 70, which is a lamella analysis mechanism, acquires the lamella transport position data D3 corresponding to the received lamella grid 20 from the server SV.
- the lamella analyzer 70 analyzes the lamella 10 (analysis unit 11) prepared as described above.
- the analysis method of the lamella 10 performed by using the lamella analyzer 70 in the following steps S12 and S13 will be described.
- the lamella analysis apparatus 70 is a TEM apparatus is illustrated.
- step S12 the sample stage 72 is moved so as to reach the transport position of the sample SAM to be analyzed based on the lamella transport position data D3.
- FIG. 22 is a front view of the sample SAM installed on the sample stage 72.
- the sample SAM is sideways so that the front surface of the sample SAM (analysis unit 11 of the lamella 10) faces the electron beam column 71 in the Y direction. Will be installed.
- each analysis unit 11 of the plurality of lamellas 10 is the analysis target unit, and the lamella grid 20 is a holder that supports the plurality of lamellas 10, but these are collectively referred to here. Described as sample SAM. Further, the analysis unit 11 and the cutting unit 12 do not overlap the support unit 22 and are exposed from the support unit 22 in a plan view viewed from the Y direction so that the analysis unit 11 is not blocked by the support unit 22. There is.
- the image of the sample SAM is acquired at a low magnification, and the position information (coordinates) of the sample stage 72 such that the analysis unit 11 of the lamella 10 is at the center of the field of view is acquired.
- the sample stage 72 is moved to the coordinates, and then the cross-section analysis of the analysis unit 11 is performed at a high magnification.
- the analysis method of the analysis unit 11 a general method can be used. For example, by irradiating the analysis unit 11 with an electron beam from the electron beam column 71, the charged particle detector 74 and the charged particle detector 75 can analyze the charged particles emitted from the analysis unit 11. Further, the X-ray detector 76 can analyze the X-rays emitted from the analysis unit 11.
- the analysis unit 11 of the first lamella 10 and the analysis unit 11 of the second lamella 10 It is possible to obtain the position information of both sample stages 72. Therefore, it is not necessary to alternately perform low magnification and high magnification, and the time for cross-sectional analysis can be shortened.
- the sample stage 72 is moved to the coordinates of the analysis unit 11 of the first lamella 10, the analysis unit 11 of the first lamella 10 completes the high-magnification cross-sectional analysis, and then the low magnification is set again. Instead, the sample stage 72 is moved to the coordinates of the analysis unit 11 of the second lamella 10, and the analysis unit 11 of the second lamella 10 performs high-magnification cross-sectional analysis.
- the work of specifying the positions of the plurality of analysis units 11 is performed at a low magnification, but the sample of the first embodiment is performed.
- the positions of the plurality of analysis units 11 can be easily specified.
- an image including, for example, a dark region 90 as shown in FIG. 23 and a bright region surrounded by the dark region 90 can be obtained.
- the analysis unit 11 having a thin width in the Y direction and the cutting unit 12 which is a through hole are displayed brightly as a bright region. That is, the bright region includes the large area region 12a corresponding to the cutting portion 12 and the small area region 11a corresponding to the analysis unit 11, and the large area region 12a and the small area region 11a are in contact with each other. In other words, the small area area 11a is displayed as a convex portion in a part of the large area area 12a.
- the small area area 11a protruding from the large area area 12a can be easily identified, and the position of the small area area 11a can be determined.
- the position of the analysis target unit (analysis unit 11) of the sample SAM is specified.
- the region above the lamella 10 is a space in which the lamella 10 and the lamella grid 20 do not exist, so that space becomes a large area region 12a.
- the analysis target portion of the sample SAM can be easily identified by searching for the small area region 11a along the boundary between the large area region 12a and the dark region 90.
- the lamella 10 is not provided with the cutting portion 12, that is, if the large area region 12a does not exist, only the small area region 11a exists as the bright region in the bright / dark image. In this case, the small area region 11a may not be clearly discriminated on the image, and the work time for specifying the position of the analysis unit 11 may increase.
- the cross-sectional analysis is performed in a state where no other lamella 10 is present near the analysis portion 11 to be observed. It can be performed. Therefore, at the time of cross-section analysis, the possibility of being affected by other components of the lamella 10 is reduced, so that the accuracy of the observation image obtained by the charged particle detector 74 and the charged particle detector 75 can be further improved. In addition, the accuracy of elemental analysis obtained by the X-ray detector 76 can be improved.
- step S13 the analysis result of the analysis unit 11 of the lamella 10 obtained by the cross-section analysis is transmitted to the server SV and stored in the server SV as analysis data D4.
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Abstract
Description
<ラメラ10およびラメラグリッド20の構造>
実施の形態1におけるラメラ10およびラメラグリッド20の大まかな構造は、図1に示される通りである。図4は、二つのラメラ10がラメラグリッド20に搭載されている様子を示す要部斜視図であり、図5~図7は、一つのラメラ10の構造を示す要部斜視図、正面図および平面図である。なお、図4に示されるように、実施の形態1では二つのラメラ10が例示されているが、ラメラグリッド20は、三つ以上の複数のラメラ10を搭載可能である。
以下に図8~図11を用いて、ラメラ10の作製、搬送および解析を行うことが可能な解析システム30の構成について説明する。図8は、実施の形態1における解析システム30を示す模式図である。解析システム30は、ラメラ作製機構、ラメラ搬送機構およびラメラ解析機構を有する。図8に示されるように、ラメラ作製機構としては、ラメラ作製装置40が使用され、ラメラ搬送機構としては、ラメラ作製装置40またはラメラ搬送装置60が使用され、ラメラ解析機構としては、ラメラ解析装置70が使用される。
図9は、実施の形態1におけるラメラ作製装置40を示す模式図である。ラメラ作製装置40は、少なくともラメラ作製機構を備え、例えばFIB-SEM装置のような荷電粒子線装置によって構成される。
図10は、実施の形態1におけるラメラ搬送装置60を示す模式図である。ラメラ搬送装置60は、少なくともラメラ搬送機構を備え、例えば二本の電子ビームカラムを備えるSEM装置のような荷電粒子線装置によって構成される。なお、ラメラ搬送装置60の多くの構成要素は、ラメラ作製装置40と同様であるため、ここではそれらの詳細な説明を省略する。
ラメラ搬送装置60は、ラメラ10をラメラグリッド20に搬送(搭載)するためのラメラ搬送機構を有する。この場合、図8に示されるように、ラメラ10が作製されたウェハ1は、ラメラ作製装置40からラメラ搬送装置60へ移送され、ラメラ10が搭載されたラメラグリッド20は、ラメラ搬送装置60からラメラ解析装置70へ移送される。
図11は、実施の形態1におけるラメラ解析装置70を示す模式図である。ラメラ解析装置70は、少なくともラメラ解析機構を備え、例えばTEM装置またはSTEM装置のような荷電粒子線装置によって構成される。
図12は、解析システム30のネットワーク構成31を示す模式図である。半導体製造ライン2、ラメラ作製装置40、ラメラ搬送装置60、ラメラ解析装置70、および、データ管理を行うサーバSVは、ネットワーク32によって電気的に接続されている。このため、これらの間で各種データのやり取りが可能となる。サーバSVは、解析位置データD1、ラメラ作製位置データD2、ラメラ搬送位置データD3および解析データD4を保持することができる。
図13は、実施の形態1における解析システム30の処理フロー図である。また、図14~図16は、ラメラ作製機構によるラメラの作製方法を示す要部斜視図であり、図17~図21は、ラメラ搬送機構によるラメラの搬送方法を示す要部斜視図である。
ステップS1において、断面解析を行いたいウェハ1が、半導体製造ライン2からラメラ作製装置40へ移送され、ウェハ1がラメラ作製装置40のウェハステージ44上に設置される。
1a 接続箇所
2 半導体製造ライン
10 ラメラ
11 解析部
11a 小面積領域(明領域)
12 切削部
12a 大面積領域(明領域)
20 ラメラグリッド
21 基体
22 支持部
22a~22d 支柱
30 解析システム
31 ネットワーク構成
32 ネットワーク
40 ラメラ作製装置
41 イオンビームカラム
42 電子ビームカラム
43 試料室
44 ウェハステージ
45 ウェハ押さえ
46 荷電粒子検出器
47 着脱器
48 ラメラグリッドステージ
49 ラメラグリッド押さえ
50 入力デバイス
51 ディスプレイ
52 GUI画面
60 ラメラ搬送装置
61 電子ビームカラム
70 ラメラ解析装置
71 電子ビームカラム
72 試料ステージ
73 試料交換室
74 荷電粒子検出器
75 荷電粒子検出器
76 X線検出器
77 試料室
78 入力デバイス
79 ディスプレイ
80 GUI画面
90 暗領域
C1 イオンビームカラム制御部
C2 電子ビームカラム制御部
C3 ウェハステージ制御部
C4 検出器制御部
C5 着脱器制御部
C6 ラメラグリッドステージ制御部
C7 統合制御部
C8 電子ビームカラム制御部
C9 電子ビームカラム制御部
C10 試料ステージ制御部
C11 検出器制御部
C12 検出器制御部
C13 X線検出器制御部
C14 統合制御部
CP1、CP2 クロスポイント
D1 解析位置データ
D2 ラメラ作製位置データ
D3 ラメラ搬送位置データ
D4 解析データ
EB1、EB2 電子ビーム(荷電粒子ビーム)
IB イオンビーム(荷電粒子ビーム)
OA1~OA3 光軸
S1~S13 ステップ
SV サーバ
W1、W2 幅
Claims (15)
- ウェハの一部をエッチングすることで、解析部および切削部を有するラメラを作製する工程を有し、
第1方向における前記ラメラの幅は、前記第1方向と直交する第2方向における前記ラメラの幅、並びに、前記第1方向および前記第2方向と直交する第3方向における前記ラメラの幅よりも小さく、
前記第1方向において、前記解析部の幅は、前記解析部の周囲の前記ラメラの幅よりも小さく、
前記切削部は、前記第1方向において前記ラメラを貫通する孔によって構成され、
前記第2方向において、前記解析部および前記切削部は、互いに離間されている、ラメラの作製方法。 - 請求項1に記載のラメラの作製方法において、
前記第2方向から見た平面視において、前記解析部は、前記切削部に重なっている、ラメラの作製方法。 - 請求項2に記載のラメラの作製方法において、
前記第3方向において、前記切削部の幅は、前記解析部の幅よりも大きい、ラメラの作製方法。 - 請求項1に記載のラメラの作製方法において、
前記エッチングは、イオンビームカラムまたは電子ビームカラムの何れかまたは両方を備えた荷電粒子線装置によって行われる、ラメラの作製方法。 - ラメラ作製機構と、ラメラ搬送機構とを備える解析システムであって、
(a)前記ラメラ作製機構において、ウェハの一部をエッチングすることで、少なくとも、第1解析部および第1切削部を有する第1ラメラと、第2解析部および第2切削部を有する第2ラメラとを作製する工程、
(b)前記ラメラ搬送機構において、前記第1ラメラおよび前記第2ラメラを前記ウェハからラメラグリッドへ順次搬送する工程、
を有し、
第1方向における前記第1ラメラの幅は、前記第1方向と直交する第2方向における前記第1ラメラの幅、並びに、前記第1方向および前記第2方向と直交する第3方向における前記第1ラメラの幅よりも小さく、
前記第1方向において、前記第1解析部の幅は、前記第1解析部の周囲の前記第1ラメラの幅よりも小さく、
前記第1切削部は、前記第1方向において前記第1ラメラを貫通する孔によって構成され、
前記第2方向において、前記第1解析部および前記第1切削部は、互いに離間され、
前記第1方向における前記第2ラメラの幅は、前記第2方向における前記第2ラメラの幅、および、前記第3方向における前記第2ラメラの幅よりも小さく、
前記第1方向において、前記第2解析部の幅は、前記第2解析部の周囲の前記第2ラメラの幅よりも小さく、
前記第2切削部は、前記第1方向において前記第2ラメラを貫通する孔によって構成され、
前記第2方向において、前記第2解析部および前記第2切削部は、互いに離間され、
前記ラメラグリッドは、基体と、前記第2方向において前記基体の表面から突出し、且つ、前記第1ラメラおよび前記第2ラメラを搭載可能な支持部とを有し、
前記(b)工程において、前記第2切削部および前記第1解析部が、前記第2方向において隣接し、且つ、前記第2方向から見た平面視において重なるように、前記第1ラメラおよび前記第2ラメラは、前記ラメラグリッドへ搬送される、解析システム。 - 請求項5に記載の解析システムにおいて、
前記第2方向から見た平面視において、前記第1解析部および第2解析部は、それぞれ前記第1切削部および前記第2切削部に重なり、
前記第3方向において、前記第1切削部の幅および前記第2切削部の幅は、それぞれ前記第1解析部の幅および前記第2切削部の幅よりも大きい、解析システム。 - 請求項5に記載の解析システムにおいて、
前記支持部は、それぞれ前記第2方向において前記基体の表面から突出した第1支柱、第2支柱、第3支柱および第4支柱を含み、
前記(b)工程において、前記第1ラメラおよび前記第2ラメラは、それぞれ前記第1支柱と前記第2支柱との間、および、前記第3支柱と前記第4支柱との間に挟まれる、解析システム。 - 請求項7に記載の解析システムにおいて、
前記第1方向から見た平面視において、前記第1解析部および前記第2解析部は、それぞれ前記第1支柱、前記第2支柱、前記第3支柱および前記第4支柱と重ならない、解析システム。 - 請求項5に記載の解析システムにおいて、
前記(a)工程は、前記ラメラ作製機構に備えられたイオンビームカラムまたは第1電子ビームカラムを用いて行われ、
前記(b)工程は、前記ラメラ搬送機構に備えられた着脱器を用いて行われる、解析システム。 - 請求項9に記載の解析システムにおいて、
前記ラメラ作製機構および前記ラメラ搬送機構は、それぞれ別の荷電粒子線装置内に含まれている、解析システム。 - 請求項9に記載の解析システムにおいて、
前記ラメラ作製機構および前記ラメラ搬送機構は、同一の荷電粒子線装置内に含まれている、解析システム。 - 請求項9に記載の解析システムにおいて、
第2電子ビームカラムおよび試料ステージを有するラメラ解析機構を更に備え、
(c)前記ラメラ解析機構において、前記第1方向において前記第1解析部および前記第2解析部が、それぞれ前記第2電子ビームカラムと向き合うように、前記第1ラメラおよび前記第2ラメラを搭載した前記ラメラグリッドが、前記試料ステージ上に設置された状態で、前記第1解析部および前記第2解析部の解析を行う工程、
を更に有する、解析システム。 - 透過電子顕微鏡を用いて行われる試料の解析方法であって、
(a)解析対象部を有する前記試料を前記透過電子顕微鏡の試料ステージ上に設置する工程、
(b)前記(a)工程後、低倍率で前記試料の画像を取得し、前記画像に基づいて前記試料の前記解析対象部の位置を特定する工程、
(c)前記(b)工程後、高倍率で前記試料の前記解析対象部の解析を実施する工程、
を有し、
前記(b)工程で取得される前記画像は、暗領域と、前記暗領域に囲まれた明領域とを含み、
前記明領域は、第1領域と、前記第1領域よりも小さな面積を有し、且つ、前記第1領域に接する第2領域とを含み、
前記第1領域と前記暗領域との境界に沿って前記第2領域を探すことで、前記第1領域から突出した前記第2領域の位置が、前記解析対象部の位置であると特定される、試料の解析方法。 - 請求項13に記載の試料の解析方法において、
前記試料は、少なくとも、第1解析部および第1切削部を有する第1ラメラと、第2解析部および第2切削部を有する第2ラメラと、前記第2切削部および前記第1解析部が隣接するように、前記第1ラメラおよび前記第2ラメラが搭載されたラメラグリッドとを有し、
前記解析対象部の位置には、前記第1解析部の位置および前記第2解析部の位置が含まれる、試料の解析方法。 - 請求項14に記載の試料の解析方法において、
第1方向における前記第1ラメラの幅は、前記第1方向と直交する第2方向における前記第1ラメラの幅、並びに、前記第1方向および前記第2方向と直交する第3方向における前記第1ラメラの幅よりも小さく、
前記第1方向において、前記第1解析部の幅は、前記第1解析部の周囲の前記第1ラメラの幅よりも小さく、
前記第1切削部は、前記第1方向において前記第1ラメラを貫通する孔によって構成され、
前記第2方向において、前記第1解析部および前記第1切削部は、互いに離間され、
前記第1方向における前記第2ラメラの幅は、前記第2方向における前記第2ラメラの幅、および、前記第3方向における前記第2ラメラの幅よりも小さく、
前記第1方向において、前記第2解析部の幅は、前記第2解析部の周囲の前記第2ラメラの幅よりも小さく、
前記第2切削部は、前記第1方向において前記第2ラメラを貫通する孔によって構成され、
前記第2方向において、前記第2解析部および前記第2切削部は、互いに離間され、
前記第2切削部および前記第1解析部が、前記第2方向において隣接し、且つ、前記第2方向から見た平面視において重なるように、前記第1ラメラおよび前記第2ラメラは、前記ラメラグリッドに搭載され、
前記第2方向から見た平面視において、前記第1解析部および第2解析部は、それぞれ前記第1切削部および前記第2切削部に重なり、
前記第3方向において、前記第1切削部の幅および前記第2切削部の幅は、それぞれ前記第1解析部の幅および前記第2切削部の幅よりも大きく、
前記第1方向において前記第1解析部および前記第2解析部が、それぞれ前記透過電子顕微鏡の電子ビームカラムと向き合っている、試料の解析方法。
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