WO2013191038A1 - アーク式蒸発源 - Google Patents
アーク式蒸発源 Download PDFInfo
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- WO2013191038A1 WO2013191038A1 PCT/JP2013/066088 JP2013066088W WO2013191038A1 WO 2013191038 A1 WO2013191038 A1 WO 2013191038A1 JP 2013066088 W JP2013066088 W JP 2013066088W WO 2013191038 A1 WO2013191038 A1 WO 2013191038A1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
- C23C14/32—Vacuum evaporation by explosion; by evaporation and subsequent ionisation of the vapours, e.g. ion-plating
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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
- H01J37/32—Gas-filled discharge tubes
- H01J37/34—Gas-filled discharge tubes operating with cathodic sputtering
- H01J37/3411—Constructional aspects of the reactor
- H01J37/345—Magnet arrangements in particular for cathodic sputtering apparatus
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
- C23C14/32—Vacuum evaporation by explosion; by evaporation and subsequent ionisation of the vapours, e.g. ion-plating
- C23C14/325—Electric arc evaporation
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/35—Sputtering by application of a magnetic field, e.g. magnetron sputtering
- C23C14/354—Introduction of auxiliary energy into the plasma
- C23C14/358—Inductive energy
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/50—Substrate holders
- C23C14/505—Substrate holders for rotation of the substrates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/54—Controlling or regulating the coating process
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/54—Controlling or regulating the coating process
- C23C14/548—Controlling the composition
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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
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32055—Arc discharge
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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
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/3266—Magnetic control means
- H01J37/32669—Particular magnets or magnet arrangements for controlling the discharge
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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
- H01J37/32—Gas-filled discharge tubes
- H01J37/34—Gas-filled discharge tubes operating with cathodic sputtering
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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
- H01J37/32—Gas-filled discharge tubes
- H01J37/34—Gas-filled discharge tubes operating with cathodic sputtering
- H01J37/3402—Gas-filled discharge tubes operating with cathodic sputtering using supplementary magnetic fields
- H01J37/3405—Magnetron sputtering
Definitions
- the present invention relates to an arc evaporation source of a film forming apparatus for forming a thin film such as a ceramic film such as a nitride and an oxide or an amorphous carbon film, which is used for improving wear resistance of a machine part or the like. It is about.
- a physical vapor deposition method that coats a thin film on the surface of a substrate such as the parts and tools has been widely used. It has been.
- this physical vapor deposition method an arc ion plating method and a sputtering method are widely known, and the arc ion plating method is a technique using a cathode discharge type arc evaporation source.
- a cathode discharge arc evaporation source (hereinafter referred to as an arc evaporation source) generates an arc discharge on the surface of a target that is a cathode, and instantaneously dissolves and evaporates a substance constituting the target to ionize it.
- the arc evaporation source draws the substance ionized by the arc discharge to the substrate side that is the object to be processed, and forms a thin film on the substrate surface.
- the evaporation rate of the target is high and the ionization rate of the evaporated substance is high, so that a dense film can be formed by applying a bias to the substrate during film formation.
- arc evaporation sources are used industrially for the purpose of forming a wear-resistant film on the surface of a cutting tool or the like.
- Target atoms that evaporate by arc discharge are highly ionized and ionized in the arc plasma.
- the transport of ions from the target to the base material is affected by the magnetic field between the target and the base material, and the trajectory is along the magnetic field lines from the target to the base material.
- the molten target (macro particles) that has melted from the vicinity of the arc spot has been melted. ) May be released.
- the adhesion of the molten target to the object to be processed becomes a cause of reducing the surface roughness of the thin film.
- the arc evaporation source disclosed in Patent Document 1 generates magnetic lines of force in the direction from the target surface toward the base material by two disc magnets arranged at intervals on the back surface of the target. These two disc magnets can generate magnetic lines of high rectilinearity at the center, but the lines of magnetic force emitted from the outer peripheral side of the center are outward with respect to the axis of the disc magnet. Diverge. This is an unavoidable phenomenon as a general magnet characteristic. In order to efficiently guide the ionized target material toward the substrate, there is room for further improvement in the arc evaporation source of Patent Document 1. There is.
- the outer peripheral magnet and the ring-shaped magnet are arranged so that the end surface on the substrate direction side is closer to the substrate than the target surface, ), A magnetic field line (parallel magnetic field) parallel to the target surface is formed on a part of the target surface.
- a parallel magnetic field is formed on the target surface, arc discharge is trapped in this parallel magnetic field and the arc discharge is stabilized, but the discharge position is biased on the target surface, resulting in uneven consumption of the target.
- the present invention is capable of generating magnetic lines of high straightness extending from the target surface toward the base material in a wide area of the target surface and capable of suppressing uneven consumption of the target. It aims to provide an evaporation source.
- the magnetization direction of the back magnetic field generation source faces forward, and when the magnetization direction of the magnetic field induction magnet faces backward, the magnetization direction of the back magnetic field generation source Is preferably facing backwards.
- the target is projected radially inward from an intermediate position between the inner peripheral surface and the outer peripheral surface in the radial direction of the magnetic field induction magnet. It is good to be arranged like this.
- the back magnetic field generation source forms magnetic lines of force passing along the magnetization direction of the magnetic field induction magnet through a hole formed by the inner peripheral surface of the ring-shaped magnetic field induction magnet, and the target is the evaporation surface It is preferable that the magnetic field lines that pass through are arranged in a position parallel to the axis of the ring-shaped magnetic field induction magnet or inclined toward the axis.
- the back magnetic field generation source includes a ring-shaped back magnet having polarity on the inner peripheral surface and the outer peripheral surface, and when the magnetization direction of the magnetic field induction magnet faces forward, the polarities of the inner peripheral surface and the outer peripheral surface
- the magnetization direction of the back magnet is directed in the ring radial direction, and the magnetization direction of the magnetic field induction magnet is directed backward, the magnetization direction of the back magnet due to the polarity of the inner peripheral surface and the outer peripheral surface is directed to the ring radial outer direction. Good.
- the back magnetic field generation source includes a plurality of the ring-shaped back magnets, and the plurality of ring-shaped back magnets have the same magnetization direction and are arranged coaxially. Good. Furthermore, it is preferable that a magnetic body penetrating each back magnet is provided in a diameter of the plurality of ring-shaped back magnets, and an outer periphery of the magnetic body is in contact with an inner peripheral surface of each back magnet.
- connects each disk-shaped magnet between the said 1st disk-shaped magnet and the 2nd disk-shaped magnet.
- the back magnetic field generation source is an air-core coil magnet, and the polarity of the coil magnet may be in the same direction as the polarity of the magnetic field induction magnet.
- a magnetic body may be disposed in the air core portion of the coil magnet.
- the arc evaporation source of the present invention it is possible to generate magnetic lines of high straightness extending from the target surface toward the base material in a wide region of the target surface and to suppress uneven consumption of the target.
- FIG. 1A is a side view showing a schematic configuration of a film forming apparatus provided with an arc evaporation source according to the first embodiment of the present invention
- FIG. 1B shows a schematic configuration of the film forming apparatus. It is a top view.
- 2A is a diagram showing a basic configuration of the arc evaporation source according to the first embodiment of the present invention
- FIG. 2B is a direction in which the magnetic field induction magnet and the target are orthogonal to the evaporation surface of the target. It is a projection figure when projecting along.
- FIGS. 1A to 1B show a film forming apparatus 6 including an arc evaporation source 1 (hereinafter referred to as an evaporation source 1) according to a first embodiment of the present invention
- FIG. FIG. 1B is a side view showing a schematic configuration of the film forming apparatus 6, and
- FIG. 1B is a plan view showing the schematic configuration of the film forming apparatus 6.
- the evaporation source 1 has a disk shape (hereinafter referred to as “disk shape”) having a predetermined thickness arranged so that the evaporation surface faces the substrate 7. Including a cylindrical shape having a predetermined height) and a magnetic field forming means 8 (consisting of a magnetic field induction magnet 3 and a back magnetic field generation source 4) disposed in the vicinity of the target 2. ing.
- the chamber 11 functions as an anode. With such a configuration, the evaporation source 1 functions as a cathode discharge type arc evaporation source.
- the target 2 is made of a material selected according to the thin film to be formed on the base material 7.
- the material include metal materials such as chromium (Cr), titanium (Ti), and titanium aluminum (TiAl), and ionizable materials such as carbon (C).
- the magnetic field forming means 8 is arranged in a ring-like (annular or donut-like) magnetic field induction magnet 3 arranged on the back side of the evaporation surface of the target 2 and coaxially arranged with the magnetic field induction magnet 3 on the back side of the target 2. And a ring-shaped (annular or donut-shaped) or cylindrical back magnetic field generation source 4.
- the magnetic field induction magnet 3 and the back magnetic field generation source 4 are constituted by permanent magnets formed of neodymium magnets having high coercive force.
- the evaporation source 1 is configured by arranging the target 2, the magnetic field induction magnet 3, and the back surface magnetic field generation source 4 so that their axes are substantially aligned.
- the magnetic field induction magnet 3 is a ring body as described above, and has an inner diameter (inner dimension) slightly larger (about 1 to 2 times) than the diameter (dimension) of the target 2 and a predetermined height along the axial direction. (Thickness).
- the height (thickness) of the magnetic field induction magnet 3 is substantially the same as or slightly smaller than the height (thickness) along the axial center direction of the target 2.
- the appearance of such a ring-shaped magnetic field induction magnet 3 is formed by connecting two annular surfaces (annular surfaces) parallel to each other and facing the front or rear surface of the target 2 and the two annular surfaces in the axial direction. It consists of two peripheral surfaces.
- the two peripheral surfaces are an inner peripheral surface 31 formed on the inner peripheral side (diameter inner side) of the annular surface and an outer peripheral surface 32 formed on the outer peripheral side (radial outer side) of the annular surface.
- the widths of the inner peripheral surface 31 and the outer peripheral surface 32 are the thickness (radial thickness) of the magnetic field induction magnet 3.
- FIG. 2B can be said to be a projection view of the magnetic field induction magnet 3 and the target 2 in the magnetization direction of the magnetic field induction magnet 3, so that the target 2 is the magnetic field induction magnet 3 and the target 2 in the magnetization direction of the magnetic field induction magnet 3.
- the magnetic field induction magnet 3 is disposed so as to be projected on the inner side in the radial direction from the intermediate position 33 between the inner peripheral surface 31 and the outer peripheral surface 33 in the radial direction.
- the magnetic field induction magnet 3 may have a ring shape or an annular integrated shape.
- the magnetic field induction magnet 3 may be configured by arranging a plurality of cylindrical or rectangular parallelepiped magnets in a ring shape or in an annular shape so that the magnetization directions of the magnets are along the direction orthogonal to the front surface of the target 2 and facing the front. Good.
- the magnetic field induction magnet 3 is arranged so as to be located behind the evaporation surface of the target 2, that is, on the back side, and is concentric with the target 2 in such an arrangement.
- the target 2 is arranged in front of the annular surface in front of the magnetic field induction magnet 3. It can be said that.
- the target 2 is arranged such that its evaporation surface is located in front of the front end surface of the magnetic field induction magnet 3.
- the target 2 is disposed such that the projection viewed from the radial direction of the target 2 is positioned forward of the projection viewed from the radial direction of the magnetic field induction magnet 3. Is provided.
- FIG. 3 is a diagram showing a configuration of an evaporation source 1a which is a specific example of the evaporation source 1 according to the present embodiment.
- the back magnetic field generation source 4a is a ring-shaped magnet having substantially the same diameter as the magnetic field induction magnet 3, and has the same inner diameter (inner dimension) and outer diameter (outer dimension) as the first magnetic field induction magnet 3.
- the 2nd back magnet 5b is arrange
- the first back magnet 5a and the second back magnet 5b are arranged so as to surround the outer periphery of one magnetic body 9a in close contact (close contact).
- the front end face of the first back magnet 5a is substantially flush with the front end face of the magnetic body 9a
- the rear end face of the second back magnet 5b is substantially flush with the rear end face of the magnetic body 9a. It is one.
- the target 2 the magnetic field induction magnet 3, the first back magnet 5a, the second back magnet 5b, and the magnetic body 9a are coaxial so that their respective axes are coincident with each other. It can be said that it is arranged in.
- the back magnetic field generation source 4a is configured by bringing the inner peripheral surfaces of the first back magnet 5a and the second back magnet 5b into close contact with the side surface of the magnetic body 9a, thereby forming the first back magnet. It is possible to linearly guide the magnetic lines of force emitted from the inner peripheral surfaces of 5a and the second back magnet 5b in the axial direction of the first back magnet 5a and the second back magnet 5b through the magnetic body 9a. .
- the magnetization direction of the magnetic field induction magnet 3 and the magnetization directions of the first back magnet 5a and the second back magnet 5b are the same as the front end surface of the magnetic field induction magnet 3, the first back magnet 5a, and the first back magnet 5a. It is only necessary that the inner peripheral surfaces of the two back magnets 5b have the same polarity and are perpendicular to each other. Therefore, the polarity of the magnetic field induction magnet 3 and the polarity of the first back magnet 5a and the second back magnet 5b are opposite to the above-described configuration shown in FIG. The magnetization directions of the back magnet 5a and the second back magnet 5b may be reversed.
- a nitride film, an oxide film, a carbonized film, a carbonitride film, an amorphous carbon film, or the like can be formed on the substrate 7 placed on the turntable 12.
- a hydrocarbon gas such as nitrogen gas (N 2 ), oxygen gas (O 2 ), or methane (CH 4 ) may be selected according to the application, and the pressure of the reaction gas in the chamber 11 may be selected. May be about 1 to 10 Pa.
- the target 2 may be discharged by flowing an arc current of 100 to 200 A, and a negative voltage of 10 to 30 V may be applied by the arc power supply 15. Further, a negative voltage of 10 to 200 V may be applied to the base material 7 by the bias power supply 16.
- the magnetic field induction magnet 3 and the back magnetic field generation source 4a it is preferable to configure and arrange the magnetic field induction magnet 3 and the back magnetic field generation source 4a so that the magnetic flux density on the front surface of the target 2 is 50 Gauss or more.
- the magnetic flux density on the front surface of the target 2 is more preferably 75 gauss or more, and further preferably 100 gauss or more.
- the magnetic flux density on the front surface of the target 2 is preferably 250 gauss or less.
- the magnetic flux density on the front surface of the target 2 is more preferably 225 gauss or less, and further preferably 200 gauss or less.
- an arc spot can be confined on the surface of the target 2 and film formation by arc discharge can be performed stably.
- Example 1 With reference to FIG. 4, the distribution of the lines of magnetic force generated in the evaporation source 1a according to the first embodiment will be described.
- the magnetic field line distribution diagram shown in FIG. 4 shows the magnetic field line distribution from the rear of the back magnetic field generation source 4a to the surface of the base material 7.
- the right end indicates the position of the surface of the substrate 7.
- the size of the target 2 is (100 mm ⁇ ⁇ 16 mm thickness).
- the dimensions of the magnetic field induction magnet 3 are (inner diameter 150 mm, outer diameter 170 mm, height 10 mm), and the distance from the front end surface of the magnetic field induction magnet 3 to the rear surface of the target 2 is 25 mm.
- the dimensions of the first back magnet 5a are (inner diameter 150 mm, outer diameter 170 mm, height 20 mm), and the distance from the front end surface of the first back magnet 5a to the rear surface of the target 2 is 100 mm.
- the dimensions of the second back magnet 5b are (inner diameter 150 mm, outer diameter 170 mm, height 20 mm), and the distance from the front end surface of the second back magnet 5b to the rear surface of the target 2 is 130 mm. The distance between the first back magnet 5a and the second back magnet 5b is 10 mm.
- magnetic field lines with high straightness exist in a wide region extending over almost the entire evaporation surface of the target 2 and extend in the direction of the base material.
- vertical magnetic field lines vertical components
- the cathode spot moves by receiving a force toward the outer peripheral direction of the target 2.
- the cathode spot may jump out of the target surface, and discharge abnormality may occur.
- the angle of the magnetic lines of force is inward (target center direction)
- the cathode spot moves by receiving a force directed toward the center direction of the target 2.
- the evaporation source 1a described in the present embodiment forms magnetic field lines with high straightness extending toward the base material by the magnetic field induction magnet 3 and the back surface magnetic field generation source 4a.
- the target 2 is arranged at a position where a vertical magnetic field line (vertical component) passes through a wide area over almost the entire evaporation surface of the target 2.
- the vertical magnetic field lines (vertical components) exist in a wide region over almost the entire evaporation surface of the target 2, so that the arc spot can be confined on the evaporation surface of the target 2.
- uneven consumption of the evaporation surface of the target 2 can be suppressed, and film formation by arc discharge can be performed stably.
- FIG. 5 is a diagram showing a schematic configuration of an arc evaporation source 1b (hereinafter referred to as an evaporation source 1b) which is a specific configuration of the arc evaporation source 1 provided in the film forming apparatus 6 according to the present embodiment.
- an evaporation source 1b an arc evaporation source 1b
- the configuration other than the evaporation source 1b is the same as the configuration described in the first embodiment. Therefore, the description of these similar components is omitted and the same reference numerals are given.
- the evaporation source 1b in the present embodiment includes a disk-shaped target 2 having a predetermined thickness and a magnetic field forming unit 8b arranged in the vicinity of the target 2.
- the magnetic field forming means 8b includes the same magnetic field induction magnet 3 as that in the first embodiment and a back magnetic field generation source 4b.
- the back magnetic field generation source 4b includes a non-ring-shaped solid magnetic body 9b serving as a magnetic core, and a disk-shaped first disk back magnet 10a and a second disk back magnet 10b sandwiching the magnetic body 9b. It is configured.
- the first disc back magnet 10a and the second disc back magnet 10b are also non-ring-shaped.
- the magnet on the back surface needs to be thick in order to efficiently extend the lines of magnetic force in the direction of the base material.
- the first disk back magnet 10a and the second disk back magnet 10b which are two magnet plates, are arranged apart from each other in parallel, and the magnetic body 9b is interposed therebetween. Filling it with prevents the magnetic force from falling.
- first disc back magnet 10a and the second disc back magnet 10b one disc surface of each disc back magnet is an N pole, and the other disc surface is S. Magnetized to be poles.
- the first disc back magnet 10a and the second disc back magnet 10b are a disc surface on the S pole side of the first disc back magnet 10a and a circle on the N pole side of the second disc back magnet 10b.
- the magnetic body 9b is sandwiched between the plate surfaces and directed toward the target 2 with the same magnetization direction.
- the back magnetic field generation source 4b configured so that the two disk back magnets sandwich the magnetic body 9b is disposed on the back surface of the target 2, so that the rectilinearity can be achieved over a wide area of the evaporation surface of the target 2.
- Many high magnetic field lines can be generated.
- the back magnetic field generation source 4b configured as described above has a magnetization direction along the axis of the target 2 and is perpendicular to the evaporation surface of the target 2, and the back surface of the first disk.
- the magnet 10 a is arranged on the back side of the target 2 so that the N pole side faces the target 2.
- the back surface magnetic field generation source 4 b is arranged so that the axis is substantially coincident with the axis of the target 2.
- the evaporation source 1 b is coaxial with the back magnetic field generation source 4 b and the magnetic field induction magnet 3 in front of the back magnetic field generation source 4 b configured as described above, that is, in front of the magnetic field induction magnet 3.
- the target 2 is arranged.
- the magnetization direction of the magnetic field induction magnet 3 is configured to face the direction perpendicular to the evaporation surface of the target 2, that is, the base material direction.
- the magnetic pole on the front end face side that is the annular face of the magnetic field induction magnet 3 is N pole
- the magnetic pole on the target 2 side of the back magnetic field generation source 4b is also N pole
- the magnetic pole on the front end face side of the magnetic field induction magnet 3 is
- the magnetic poles on the target 2 side of the back magnetic field generation source 4b have the same polarity.
- the magnetic field induction magnet 3 and the back magnetic field generation source 4b have the same polarity toward the target 2, thereby combining the magnetic field formed by the magnetic field induction magnet 3 and the magnetic field formed by the back magnetic field generation source 4b.
- the magnetic field induction magnet 3 and the back magnetic field generation source 4b only have to have the same magnetic poles directed to the target 2. Therefore, the evaporation source 1b has the magnetic field induction magnet 3 and the back magnetic field generation source 4b having the S pole. It may be configured to be directed toward the target 2.
- Example 2 With reference to FIG. 6, the distribution of the lines of magnetic force generated in the evaporation source 1b according to the second embodiment will be described.
- the magnetic field line distribution diagram shown in FIG. 6 shows the magnetic field line distribution from the rear of the back magnetic field generation source 4b to the surface of the substrate 7. In the magnetic field line distribution diagram of FIG. 6, the right end indicates the position of the surface of the substrate 7.
- Example 2 The experimental conditions in Example 2 described below are shown.
- the size of the target 2 is (100 mm ⁇ ⁇ 16 mm thickness).
- the dimensions of the first disc back magnet 10a and the second disc back magnet 10b are each (100 mm ⁇ ⁇ 4 mm thickness).
- the dimension of the magnetic body 9b is (100 mm ⁇ ⁇ 30 mm thickness).
- the dimensions of the magnetic field induction magnet 3 are (inner diameter 150 mm ⁇ , outer diameter 170 mm, thickness 10 mm).
- the magnetic flux density on the surface of the target 2 is 50 gauss or more.
- the distance from the front end surface of the magnetic field induction magnet 3 to the rear surface of the target 2 is 25 mm.
- the distance from the front end surface of the first disc back magnet 10a to the rear surface of the target 2 is 100 mm.
- a large number of magnetic lines of high straightness are generated from the first disk back magnet 10 a and the second disk back magnet 10 b of the back magnetic field generation source 4 b toward the target 2. These lines of magnetic force extend toward the target 2 so that the traveling direction is along the axial direction of the magnetic body 9b. These lines of magnetic force pass through the evaporation surface of the target 2 in combination with the lines of magnetic force emitted from the magnetic field induction magnet 3.
- the evaporation source 1b described in the present embodiment forms magnetic field lines with high straightness extending toward the base material by the magnetic field induction magnet 3 and the back surface magnetic field generation source 4b.
- the target 2 is arranged at a position where a vertical magnetic field line (vertical component) passes through a wide area over almost the entire evaporation surface of the target 2.
- the evaporation source 1b according to the present embodiment there are vertical magnetic force lines (vertical components) in a wide region over almost the entire evaporation surface of the target 2.
- the arc spot can be confined on the evaporation surface of the target 2, the uneven consumption of the evaporation surface of the target 2 can be suppressed, and film formation by arc discharge can be performed stably.
- FIG. 7 is a diagram showing a schematic configuration of an arc evaporation source 1c (hereinafter referred to as an evaporation source 1c), which is a specific configuration of the arc evaporation source 1 provided in the film forming apparatus 6 according to the present embodiment.
- an evaporation source 1c an arc evaporation source 1c
- the configuration other than the evaporation source 1c is the same as the configuration described in the first embodiment, and therefore, description of these similar components is omitted and the same reference numerals are given.
- the evaporation source 1c in the present embodiment includes a disk-shaped target 2 having a predetermined thickness, and a magnetic field forming unit 8c disposed in the vicinity of the target 2.
- the magnetic field forming means 8c includes the same magnetic field induction magnet 3 as that of the first embodiment and a back magnetic field generation source 4c.
- the back surface magnetic field generating source 4c includes an air core-shaped electromagnetic coil (coil magnet) 17 formed by winding a conductor in a substantially concentric ring shape (annular shape), and a hole formed inside the ring-shaped electromagnetic coil 17. Is provided with a single magnetic body 9c inserted in the air core portion.
- the electromagnetic coil 17 is a solenoid formed in a ring shape.
- the number of turns is about several hundred times (for example, 410 times), and is wound so as to be a coil having a diameter larger than the diameter of the target 2. ing.
- the magnetic field is generated at an amperage of about 5000 A ⁇ T.
- the magnetic body 9 c is a non-ring-shaped solid magnetic body 9 c and serves as a magnetic core of the electromagnetic coil 17.
- the magnetic body 9 c is provided in the air core portion of the electromagnetic coil 17 so as to penetrate the electromagnetic coil 17, and has a disk shape or a columnar shape having substantially the same diameter as the inner diameter of the electromagnetic coil 17.
- the electromagnetic coil 17 is arranged so as to surround the outer periphery of one magnetic body 9c in close contact (close contact).
- the front end face of the electromagnetic coil 17 is substantially flush with the front end face of the magnetic body 9c
- the rear end face of the electromagnetic coil 17 is substantially flush with the rear end face of the magnetic body 9c.
- the electromagnetic coil 17 can generate magnetic lines with high straightness from the periphery of the coil axis, by arranging the magnetic body 9c in the air core portion of the electromagnetic coil 17, the linearity of the magnetic lines generated from the periphery of the coil axis. Can be increased. Therefore, by arranging the electromagnetic coil 17 on the back surface of the target 2, a large number of magnetic field lines having high straightness can be generated over a wide area of the evaporation surface of the target 2.
- the target 2 the magnetic field induction magnet 3, the electromagnetic coil 17, and the magnetic body 9c are arranged coaxially so that their respective axes coincide with each other.
- the density of the lines of magnetic force generated from the electromagnetic coil 17 can be increased at a position close to the axial center of the electromagnetic coil 17 by bringing the inner peripheral surface of the electromagnetic coil 17 and the side surface of the magnetic body 9 c into close contact. It becomes possible. As a result, it is possible to generate a large number of magnetic field lines with high straightness toward the target 2 from a position close to the axial center of the front end surface of the magnetic body 9c.
- Example 3 With reference to FIG.
- FIG. 8 the distribution of the lines of magnetic force generated in the evaporation source 1c according to the third embodiment will be described.
- the magnetic force line distribution map shown by FIG. 8 has shown the magnetic force line distribution from the back of the back surface magnetic field generation source 4c to the surface of the base material 7.
- FIG. 8 In the magnetic field line distribution diagram of FIG. 8, the right end indicates the position of the surface of the substrate 7.
- the dimensions of the magnetic field induction magnet 3 are (inner diameter 150 mm ⁇ , outer diameter 170 mm, thickness 10 mm).
- the dimension of the target 2 is (100 mm ⁇ ⁇ 16 mm thickness).
- the magnetic flux density on the surface of the target 2 is 50 gauss or more.
- the electromagnetic coil 17 is a solenoid formed in a ring shape having an inner diameter of 100 mm ⁇ , an outer diameter of 170 mm, and a thickness of 50 mm in the air core, and has, for example, 410 turns.
- the dimension of the magnetic body 9c provided in the air core part of the electromagnetic coil 17 is (100 mm ⁇ ⁇ 50 mm thickness).
- the distance from the front end surface of the magnetic field induction magnet 3 to the rear surface of the target 2 is 25 mm.
- the distance from the front end surface of the magnetic body 9c to the rear surface of the target 2 is 100 mm.
- a large number of magnetic field lines with high straightness are generated from the magnetic body 9 c of the back magnetic field generation source 4 c toward the target 2. These lines of magnetic force extend toward the target 2 so that the traveling direction is along the axial direction of the magnetic body 9c. These lines of magnetic force pass through the evaporation surface of the target 2 in combination with the lines of magnetic force emitted from the magnetic field induction magnet 3.
- the evaporation source 1c described in the present embodiment forms magnetic field lines with high straightness extending toward the base material by the magnetic field induction magnet 3 and the back surface magnetic field generation source 4c.
- the target 2 is arranged at a position where a vertical magnetic field line (vertical component) passes through a wide area over almost the entire evaporation surface of the target 2.
- vertical magnetic field lines vertical components are generated in a wide area over almost the entire evaporation surface of the target 2.
- the arc spot can be confined on the evaporation surface of the target 2, the uneven consumption of the evaporation surface of the target 2 can be suppressed, and film formation by arc discharge can be performed stably.
- the first to third embodiments described above it is possible to form magnetic lines of force that are inward or substantially parallel to the normal line of the evaporation surface of the target 2.
- the direction of the magnetic lines of force can not only suppress abnormal discharge during arc discharge, but also obtain more stable discharge than in the past. This stabilization of the discharge can realize an arc discharge over the entire evaporation surface of the target 2, so that the use yield rate of the target 2 can be increased.
- a large number of magnetic lines of high linearity can be formed from the entire evaporation surface of the target 2 toward the base material 7, so that the target can be used during arc discharge.
- the efficiency of transporting particles (ions) evaporated from 2 to the workpiece can be increased, and the film formation rate can be improved.
- the target 2 is not limited to the disk shape, and may have a polygonal shape such as a square shape.
- the magnetic field induction magnet 3 and the back surface magnetic field generation sources 4a to 4c are not limited to an annular shape, and may be a polygonal annular shape such as a quadrangle.
- the arc evaporation source of the present invention it is possible to generate magnetic lines of high straightness extending from the target surface toward the base material in a wide region of the target surface and to suppress uneven consumption of the target.
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Abstract
Description
しかし、カソード(ターゲット)とアノードの間で生じるアーク放電において、カソード側の電子放出点(アークスポット)を中心としてターゲットが蒸発する際に、アークスポット近傍から溶融した蒸発前の溶融ターゲット(マクロパーティクル)が放出されることがある。この溶融ターゲットの被処理体への付着は、薄膜の面粗度を低下させる原因となる。
このような問題を解消するために、ターゲット表面に磁界を印加し、アークスポットの移動を制御する次のような技術が提案されている。
特許文献2には、ターゲット周囲に配置されたリング状磁石と背面の電磁コイルによりターゲット表面に平行な磁場を形成するアーク蒸発装置が開示されている。このアーク蒸発装置によれば、ターゲットの中心からその外縁部までのあらゆるトラックに従ったアークの誘導が達成されるとされている。
つまり、特許文献1及び2に開示の技術では、ターゲットの背面に設ける磁石や電磁石の特性上、ターゲットの中央部のみに、ターゲットの前面から基材に向かって直進性の高い磁力線を発生させることができる。そのため、特許文献1及び2に開示の技術によっては、ターゲット全面に直進性の高い磁力線を形成することができないので、成膜速度を十分に向上させることが困難である。
本発明に係るアーク式蒸発源は、ターゲットと、リング状の磁場誘導磁石と、背面磁場発生源と、を備えたアーク式蒸発源であって、前記磁場誘導磁石は、前記ターゲットの蒸発面と直交する方向に沿うと共に前方又は後方を向く磁化方向となる極性を有し、前記背面磁場発生源は、前記ターゲットの背面側であって前記磁場誘導磁石の後方に配置されると共に、前記磁場誘導磁石の磁化方向に沿って磁力線を形成し、前記ターゲットは、前記蒸発面が前記磁場誘導磁石よりも前方に位置するように配置されていることを特徴とする。
ここで、前記磁場誘導磁石の磁化方向における磁場誘導磁石及びターゲットの投影において、前記ターゲットが、前記磁場誘導磁石の径方向における内周面と外周面との中間位置よりも径内側に投影されるように配置されているとよい。
ここで、前記背面磁場発生源は、内周面及び外周面に極性を有するリング状の背面磁石を含み、前記磁場誘導磁石の磁化方向が前方を向く場合、前記内周面及び外周面の極性による背面磁石の磁化方向はリング径内方向を向き、前記磁場誘導磁石の磁化方向が後方を向く場合、前記内周面及び外周面の極性による背面磁石の磁化方向はリング径外方向を向くとよい。
さらに、前記複数のリング状の背面磁石の径内には、各背面磁石を貫通する磁性体が設けられており、前記磁性体の外周が各背面磁石の内周面と接しているとよい。
ここで、前記背面磁場発生源は、空心状のコイル磁石であって、前記コイル磁石の極性は、前記磁場誘導磁石の極性と同方向を向くとよい。
また、前記コイル磁石の空心部分には、磁性体が配置されているとよい。
[第1実施形態]
図1~図4を参照して、本発明の第1実施形態について説明する。図1(a)~(b)は、本発明の第1実施形態によるアーク式蒸発源1(以下、蒸発源1という)を備えた成膜装置6を示しており、図1(a)は、成膜装置6の概略構成を示す側面図であり、図1(b)は、成膜装置6の概略構成を示す平面図である。
加えて、成膜装置6には、後に詳述する蒸発源1のターゲット2に負のバイアスをかけるアーク電源15と、基材7に負のバイアスをかけるバイアス電源16とが設けられている。両電源15、16の正極側はグランド18に接地されている。
蒸発源1は、上述したように、所定の厚みを有する円板状のターゲット2と、ターゲット2の近傍に配備された磁界形成手段8とから構成されている。
なお、以下の説明において、ターゲット2の蒸発面であって基材7側(基材方向)を向く面を「前面(ターゲット前面)」といい、その反対側(基材と反対方向)を向く面を「背面(ターゲット背面)」という(図2(a)を参照)。
磁界形成手段8は、ターゲット2の蒸発面よりも背面側に配置されたリング状(環状乃至はドーナツ状)の磁場誘導磁石3と、ターゲット2の背面側で磁場誘導磁石3と同軸状に配置されたリング状(環状乃至はドーナツ状)又は円柱状の背面磁場発生源4とを有している。これら磁場誘導磁石3及び背面磁場発生源4は、保磁力の高いネオジム磁石により形成された永久磁石などによって構成されている。
磁場誘導磁石3は、上述のとおりリング体であって、ターゲット2の径(寸法)よりも若干大きな(1~2倍程度の)内径(内寸)と軸心方向に沿った所定の高さ(厚み)とを有している。磁場誘導磁石3の高さ(厚み)は、ターゲット2の軸心方向に沿った高さ(厚み)とほぼ同じであるか若干小さい。
図2(b)の投影図において、ターゲット2及び磁場誘導磁石3の形状は、磁場誘導磁石3の径内側の内周面31の投影形状とターゲット2の投影形状が、互いに相似となるように形成されている。また、ターゲット2は、図2(b)の投影図において、磁場誘導磁石3の径方向における内周面31と外周面32との中間位置33よりも径内側に投影されるように配置されている。
図2(a)に示すように、磁場誘導磁石3は、基材7側を向く前方の円環面(前端面)がN極となり、その反対側を向く後方の円環面(後端面)がS極となるように構成されている。図中、磁場誘導磁石3の後方の円環面の磁極(S極)から前方の円環面の磁極(N極)に向かう矢印が示されているが、以降、このS極からN極に向かう矢印の方向を磁化方向とよぶ。本実施形態の磁場誘導磁石3は、この磁化方向がターゲット2の前面(蒸発面)と直交する方向に沿うと共に前方を向くように配置されている。
磁場誘導磁石3は、ターゲット2の蒸発面よりも後方、つまり背面側に位置するように配置されており、このような配置においてターゲット2と同心軸状となっている。このとき、磁場誘導磁石3の前方の円環面はターゲット2の蒸発面よりも後方に位置しているので、ターゲット2は、磁場誘導磁石3の前方の円環面よりも前方に配置されているといえる。
次に、図2(a)及び図3を参照しながら、背面磁場発生源4の具体的な構成について説明する。図3は、本実施形態による蒸発源1の具体例である蒸発源1aの構成を示す図である。
上述のように、磁場誘導磁石3の磁化方向と第1の背面磁石5a及び第2の背面磁石5bの磁化方向とを互いに垂直な方向とすれば、磁場誘導磁石3によって形成される磁界と第1の背面磁石5a及び第2の背面磁石5bによって形成される磁界とを組み合わせることができ、背面磁場発生源4aは、図3に示すような磁場誘導磁石3の前方を向く磁化方向と同じく、前方を向く磁化方向を有することとなる。
磁性体9aは、非リング状の中実な磁性体であって、第1の背面磁石5a及び第2の背面磁石5bの磁心となるものである。磁性体9aは、第1の背面磁石5a及び第2の背面磁石5bを貫通するように設けられており、第1の背面磁石5a及び第2の背面磁石5bの内径と同一の径を有する円板状又は円柱状を有している。ここで、「非リング状」とは、ドーナツ状に径方向内部に孔が空いている環状ではなく、円板状や円柱状等の中実な形状を指す。
第1の背面磁石5a及び第2の背面磁石5bの内周面と磁性体9aを密着させることにより、第1の背面磁石5a及び第2の背面磁石5bの端面から発生した磁力線を第1の背面磁石5a及び第2の背面磁石5bの軸心方向に誘導することが可能となり、第1の背面磁石5a及び第2の背面磁石5bの軸心近傍での磁力の反発作用を大きくすることが可能となる。その結果、第1の背面磁石5a及び第2の背面磁石5bの軸心方向に沿った直進性の高い磁力線を発生することができ、第1の背面磁石5a及び第2の背面磁石5bの前方に配置されたターゲット2の蒸発面の広い領域において、直進性の高い磁力線を多数発生させることができる。
図3に示すように、第1の背面磁石5a及び第2の背面磁石5bの内周面と磁性体9aの側面を密着させて背面磁場発生源4aを構成することにより、第1の背面磁石5a及び第2の背面磁石5bの内周面から出た磁力線を、磁性体9aを通じて第1の背面磁石5a及び第2の背面磁石5bの軸心方向に直線的に誘導することが可能となる。従って、磁性体9aにおいて、第1の背面磁石5a及び第2の背面磁石5bの軸心に近い位置での磁力線の反発作用を大きくすることが可能となる。その結果、背面磁場発生源4aは、磁性体9aの前端面の軸心に近い位置から、ターゲット2に向かって直進性の高い磁力線を多数発生させることができる。
まず、チャンバ11を真空引きして真空にした後、アルゴンガス(Ar)等の不活性ガスをガス導入口13より導入し、ターゲット2及び基材7上の酸化物等の不純物をスパッタによって除去する。不純物の除去後、チャンバ11内を再び真空にして、真空となったチャンバ11内にガス導入口13より反応ガスを導入する。
なお、反応ガスとしては、窒素ガス(N2)や酸素ガス(O2)、またはメタン(CH4)などの炭化水素ガスを用途に合わせて選択すればよく、チャンバ11内の反応ガスの圧力は1~10Pa程度とすればよい。また、成膜時、ターゲット2は、100~200Aのアーク電流を流すことで放電させると共に、10~30Vの負電圧をアーク電源15により印加するとよい。さらに、基材7には10~200Vの負電圧をバイアス電源16により印加するとよい。
上記のような磁束密度を採用することで、ターゲット2の表面上にアークスポットを閉じこめることができるとともに、アーク放電による成膜を安定して行うことができる。
(実施例1)
図4を参照しながら、第1実施形態による蒸発源1aで発生する磁力線の分布について説明する。なお、図4で示される磁力線分布図は、背面磁場発生源4aの後方から基材7の表面までの磁力線分布を示している。図4の磁力線分布図において、右端は基材7の表面の位置を示している。
第1の背面磁石5aの寸法は、(内径150mm、外径170mm、高さ20mm)であり、第1の背面磁石5aの前端面からターゲット2の後面までの距離は100mmとなっている。第2の背面磁石5bの寸法は、(内径150mm、外径170mm、高さ20mm)であり、第2の背面磁石5bの前端面からターゲット2の後面までの距離は130mmとなっている。第1の背面磁石5aと第2の背面磁石5bの間隔は10mmである。
図4を参照すると、第1の背面磁石5a及び第2の背面磁石5bから径内方向へ向かって、直進性の高い磁力線が多数出ている。これら磁力線は、磁性体9aの軸心近くで、進行方向を該軸心方向に沿うようにほぼ垂直に変化させて、ターゲット2に向かって伸びる。これら磁力線は、磁場誘導磁石3から出た磁力線と組み合わされてターゲット2の蒸発面を通過する。ターゲット2の蒸発面からは、直進性の高い磁力線がターゲット2の蒸発面のほぼ全面にわたる広い領域において存在し、基材方向に伸びている。言い換えれば、ターゲット2の蒸発面のほぼ全面にわたる広い領域において、垂直の磁力線(垂直成分)が存在している。
本実施形態による蒸発源1aによれば、ターゲット2の蒸発面のほぼ全面にわたる広い領域において垂直の磁力線(垂直成分)が存在することによって、ターゲット2の蒸発面上にアークスポットを閉じこめることができるとともに、ターゲット2の蒸発面の偏消耗を抑制することができ、アーク放電による成膜を安定して行うことができる。
図5及び図6を参照して、本発明の第2実施形態について説明する。
図5は、本実施形態による成膜装置6に備えられたアーク式蒸発源1の具体的構成であるアーク式蒸発源1b(以下、蒸発源1bという)の概略構成を示す図である。本実施形態による成膜装置6において、蒸発源1b以外の構成は第1実施形態で説明した構成と同様であるので、これら同様の構成要素については説明を省略し同じ参照番号を付す。
背面磁場発生源4bは、磁心となる非リング状の中実な磁性体9bと、磁性体9bを挟む円板状の第1の円板背面磁石10a及び第2の円板背面磁石10bとから構成されている。第1の円板背面磁石10a及び第2の円板背面磁石10bも、磁性体9bと同様に非リング状である。これまでの知見から、基材方向に効率的に磁力線を延ばすためには背面の磁石は厚みが必要であることが分かっている。本実施形態では、その厚みを確保するために2枚の磁石板である第1の円板背面磁石10a及び第2の円板背面磁石10bを並列に離して配置し、かつその間を磁性体9bで埋めることで磁力の低下を防いでいる。
第1の円板背面磁石10a及び第2の円板背面磁石10bを並列に間隔を空けて配置することによって、各円板背面磁石から発生する磁力線の直進性が増す。さらに、第1の円板背面磁石10a及び第2の円板背面磁石10bの間に磁性体9bを配置することにより、磁性体9bが磁気ガイドの役割を果たすので、円板背面磁石から発生する磁力線の直進性をさらに増すことができる。
上述のように構成された背面磁場発生源4bは、その磁化方向がターゲット2の軸心に沿うものであってターゲット2の蒸発面に対して垂直となるように、且つ第1の円板背面磁石10aのN極側がターゲット2に向くように、ターゲット2の背面側に配置される。このとき、背面磁場発生源4bは、軸心がターゲット2の軸心とほぼ一致するように配置される。
(実施例2)
図6を参照しながら、第2実施形態による蒸発源1bで発生する磁力線の分布について説明する。なお、図6で示される磁力線分布図は、背面磁場発生源4bの後方から基材7の表面までの磁力線分布を示している。図6の磁力線分布図において、右端は基材7の表面の位置を示している。
図6を参照すると、背面磁場発生源4bの第1の円板背面磁石10a及び第2の円板背面磁石10bからターゲット2に向かって、直進性の高い磁力線が多数出ている。これら磁力線は、進行方向を磁性体9bの軸心方向に沿うようにターゲット2に向かって伸びている。これら磁力線は、磁場誘導磁石3から出た磁力線と組み合わされてターゲット2の蒸発面を通過する。第1実施形態による蒸発源1aと同様に、ターゲット2の蒸発面からは、直進性の高い磁力線がターゲット2の蒸発面のほぼ全面にわたる広い領域において存在し、基材方向に伸びている。言い換えれば、ターゲット2の蒸発面のほぼ全面にわたる広い領域において、垂直の磁力線(垂直成分)が存在している。
本実施形態による蒸発源1bによれば、ターゲット2の蒸発面のほぼ全面にわたる広い領域において垂直の磁力線(垂直成分)が存在する。これによって、ターゲット2の蒸発面上にアークスポットを閉じこめることができるとともに、ターゲット2の蒸発面の偏消耗を抑制することができ、アーク放電による成膜を安定して行うことができる。
図7及び図8を参照して、本発明の第3実施形態について説明する。
図7は、本実施形態による成膜装置6に備えられたアーク式蒸発源1の具体的構成であるアーク式蒸発源1c(以下、蒸発源1cという)の概略構成を示す図である。本実施形態による成膜装置6において、蒸発源1c以外の構成は第1実施形態で説明した構成と同様であるので、これら同様の構成要素については説明を省略し同じ参照番号を付す。
背面磁場発生源4cは、導体をほぼ同心のリング状(環状)に巻回して形成された空心状の電磁コイル(コイル磁石)17と、リング状の電磁コイル17の径内側に形成された孔である空心部分に挿入された単一の磁性体9cを備えている。
磁性体9cは、非リング状の中実な磁性体9cであって、電磁コイル17の磁心となるものである。磁性体9cは、電磁コイル17を貫通するように電磁コイル17の空心部分に設けられており、電磁コイル17の内径とほぼ同一の径を有する円板形状又は円柱形状を有している。
電磁コイル17を配置したことで得られる効果は、次のとおりである。
(実施例3)
図8を参照しながら、第3実施形態による蒸発源1cで発生する磁力線の分布について説明する。なお、図8で示される磁力線分布図は、背面磁場発生源4cの後方から基材7の表面までの磁力線分布を示している。図8の磁力線分布図において、右端は基材7の表面の位置を示している。
図8を参照すると、背面磁場発生源4cの磁性体9cからターゲット2に向かって直進性の高い磁力線が多数出ている。これら磁力線は、進行方向が磁性体9cの軸心方向に沿うようにターゲット2に向かって伸びている。これら磁力線は、磁場誘導磁石3から出た磁力線と組み合わされてターゲット2の蒸発面を通過する。第1実施形態による蒸発源1aと同様に、ターゲット2の蒸発面からは、直進性の高い磁力線がターゲット2の蒸発面のほぼ全面にわたる広い領域において存在し、基材方向に伸びている。言い換えれば、ターゲット2の蒸発面のほぼ全面にわたる広い領域において、垂直の磁力線(垂直成分)が存在している。
本実施形態による蒸発源1cによれば、ターゲット2の蒸発面のほぼ全面にわたる広い領域において垂直の磁力線(垂直成分)が発生する。これによって、ターゲット2の蒸発面上にアークスポットを閉じこめることができるとともに、ターゲット2の蒸発面の偏消耗を抑制することができ、アーク放電による成膜を安定して行うことができる。
ところで、今回開示された実施形態はすべての点で例示であって制限的なものではないと考えられるべきである。特に、今回開示された実施形態において、明示的に開示されていない事項、例えば、動作条件や測定条件、各種パラメータ、構成物の寸法、重量、体積などは、当業者が通常実施する範囲を逸脱するものではなく、通常の当業者であれば、容易に想定することが可能な値を採用している。
本出願は、2012年6月20日出願の日本特許出願(特願2012-139078)に基づくものであり、その内容はここに参照として取り込まれる。
2 ターゲット
3 磁場誘導磁石
4,4a,4b,4c 背面磁場発生源
5a 第1の背面磁石
5b 第2の背面磁石
6 成膜装置
7 基材
8a,8b,8c 磁界形成手段
9a,9b,9c 磁性体
10a 第1の円板背面磁石
10b 第2の円板背面磁石
11 真空チャンバ
12 回転台
13 ガス導入口
14 ガス排気口
15 アーク電源
16 バイアス電源
17 電磁コイル
18 グランド
Claims (11)
- ターゲットと、リング状の磁場誘導磁石と、背面磁場発生源と、を備えたアーク式蒸発源であって、
前記磁場誘導磁石は、前記ターゲットの蒸発面と直交する方向に沿うと共に前方又は後方を向く磁化方向となる極性を有し、
前記背面磁場発生源は、前記ターゲットの背面側であって前記磁場誘導磁石の後方に配置されると共に、前記磁場誘導磁石の磁化方向に沿って磁力線を形成し、
前記ターゲットは、前記蒸発面が前記磁場誘導磁石よりも前方に位置するように配置されていることを特徴とするアーク式蒸発源。 - 前記磁場誘導磁石の磁化方向が前方を向く場合、前記背面磁場発生源の磁化方向は前方を向き、前記磁場誘導磁石の磁化方向が後方を向く場合、前記背面磁場発生源の磁化方向は後方を向くことを特徴とする請求項1に記載のアーク式蒸発源。
- 前記磁場誘導磁石の磁化方向における磁場誘導磁石及びターゲットの投影において、前記ターゲットが、前記磁場誘導磁石の径方向における内周面と外周面との中間位置よりも径内側に投影されるように配置されていることを特徴とする請求項1に記載のアーク式蒸発源。
- 前記背面磁場発生源は、前記リング状の磁場誘導磁石の内周面が形成する孔部を前記磁場誘導磁石の磁化方向に沿って通過する磁力線を形成し、
前記ターゲットは、前記蒸発面を通過する磁力線が前記リング状の磁場誘導磁石の軸心に対して平行となる又は前記軸心側に傾く位置に配置されていることを特徴とする請求項1に記載のアーク式蒸発源。 - 前記背面磁場発生源は、内周面及び外周面に極性を有するリング状の背面磁石を含み、前記磁場誘導磁石の磁化方向が前方を向く場合、前記内周面及び外周面の極性による背面磁石の磁化方向はリング径内方向を向き、前記磁場誘導磁石の磁化方向が後方を向く場合、前記内周面及び外周面の極性による背面磁石の磁化方向はリング径外方向を向くことを特徴とする請求項1記載のアーク式蒸発源。
- 前記背面磁場発生源は、複数の前記リング状の背面磁石を含み、前記複数のリング状の背面磁石は、同じ磁化方向となる極性を有し、かつ、同軸状に配置されていることを特徴とする請求項5に記載のアーク式蒸発源。
- 前記複数のリング状の背面磁石の径内には、各背面磁石を貫通する磁性体が設けられており、前記磁性体の外周が各背面磁石の内周面と接していることを特徴とする請求項6に記載のアーク式蒸発源。
- 前記背面磁場発生源は、互いに間隔を空けて配置された円板状の第1の円板状磁石と第2の円板状磁石を含み、前記第1の円板状磁石及び第2の円板状磁石のそれぞれは、一方の円板面から他方の円板面に向かう磁化方向を有するように円板面に極性を有すると共に、互いの磁化方向が同じとなるように配置され、前記磁場誘導磁石の磁化方向が前方を向く場合、前記第1の円板状磁石及び第2の円板状磁石による磁化方向は前方を向き、前記磁場誘導磁石の磁化方向が後方を向く場合、前記第1の円板状磁石及び第2の円板状磁石による磁化方向は後方を向くことを特徴とする請求項1に記載のアーク式蒸発源。
- 前記第1の円板状磁石及び第2の円板状磁石の間には、各円板状磁石と接する磁性体が設けられていることを特徴とする請求項8に記載のアーク式蒸発源。
- 前記背面磁場発生源は、空心状のコイル磁石であって、前記コイル磁石の極性は、前記磁場誘導磁石の極性と同方向を向くことを特徴とする請求項1に記載のアーク式蒸発源。
- 前記コイル磁石の空心部分には、磁性体が配置されていることを特徴とする請求項10に記載のアーク式蒸発源。
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KR1020147035083A KR101629131B1 (ko) | 2012-06-20 | 2013-06-11 | 아크식 증발원 |
MX2014015146A MX2014015146A (es) | 2012-06-20 | 2013-06-11 | Fuente de evaporacion de arco. |
BR112014031757-7A BR112014031757B1 (pt) | 2012-06-20 | 2013-06-11 | fonte de evaporação de arco |
US14/397,550 US9818586B2 (en) | 2012-06-20 | 2013-06-11 | Arc evaporation source |
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EP3156516A4 (en) * | 2014-07-30 | 2017-04-19 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Arc evaporation source |
CN106460159B (zh) * | 2014-07-30 | 2019-03-05 | 株式会社神户制钢所 | 电弧蒸发源 |
US10913997B2 (en) | 2014-07-30 | 2021-02-09 | Kobe Steel, Ltd. | Arc evaporation source |
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BR112014031757A2 (pt) | 2017-06-27 |
EP2865783A4 (en) | 2015-12-30 |
IL235153A0 (en) | 2014-12-31 |
CA2871419C (en) | 2019-03-12 |
EP2865783A1 (en) | 2015-04-29 |
BR112014031757B1 (pt) | 2021-05-25 |
KR20150008494A (ko) | 2015-01-22 |
US20150122644A1 (en) | 2015-05-07 |
KR101629131B1 (ko) | 2016-06-09 |
CA2871419A1 (en) | 2013-12-27 |
JP5946337B2 (ja) | 2016-07-06 |
JP2014001440A (ja) | 2014-01-09 |
TWI491752B (zh) | 2015-07-11 |
US9818586B2 (en) | 2017-11-14 |
EP2865783B1 (en) | 2019-12-11 |
MX2014015146A (es) | 2015-03-05 |
TW201414866A (zh) | 2014-04-16 |
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