WO2020137027A1 - スパッタリング装置及びスパッタリング方法 - Google Patents
スパッタリング装置及びスパッタリング方法 Download PDFInfo
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- WO2020137027A1 WO2020137027A1 PCT/JP2019/035870 JP2019035870W WO2020137027A1 WO 2020137027 A1 WO2020137027 A1 WO 2020137027A1 JP 2019035870 W JP2019035870 W JP 2019035870W WO 2020137027 A1 WO2020137027 A1 WO 2020137027A1
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- 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
- C23C14/3407—Cathode assembly for sputtering apparatus, e.g. Target
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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
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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
- C23C14/3464—Sputtering using more than one target
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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
- C23C14/3471—Introduction of auxiliary energy into the plasma
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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
- C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
- C23C14/564—Means for minimising impurities in the coating chamber such as dust, moisture, residual gases
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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
- H01J37/32532—Electrodes
- H01J37/32568—Relative arrangement or disposition of electrodes; moving means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/34—Gas-filled discharge tubes operating with cathodic sputtering
- H01J37/3411—Constructional aspects of the reactor
- H01J37/3414—Targets
- H01J37/3417—Arrangements
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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
- H01J37/3435—Target holders (includes backing plates and endblocks)
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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
- H01J37/3447—Collimators, shutters, apertures
Definitions
- the present invention relates to a sputtering device and a sputtering method, and more particularly, to a device that can improve the utilization efficiency of a target.
- a thin film such as a barrier film or a seed layer on the bottom surface and side surface of a hole or trench formed on the surface of a substrate to be processed.
- a thin film with good coverage on the bottom and side surfaces of the hole or trench and with good symmetry with respect to the hole or trench (that is, so that the film thicknesses formed on the opposite side surfaces of the hole or trench are the same).
- a sputtering apparatus capable of forming a film is known from Patent Document 1, for example.
- the above-mentioned conventional example is a so-called LTS (Long Throw Sputtering) type, which has a vacuum chamber capable of forming a vacuum atmosphere, a target is arranged on the upper part of the vacuum chamber, and a lower part is formed inside the vacuum chamber. A stage is provided on which the substrate to be processed is set facing the target. In this case, the distance (T/S distance) between the target and the substrate to be processed on the stage is set longer than that of a general sputtering apparatus. As a result, it is possible to increase the proportion of the sputtered particles having a straight traveling property among the sputtered particles that reach the surface of the substrate to be processed, and as a result, it is possible to form a film with good coverage and symmetry.
- LTS Long Throw Sputtering
- the present invention does not impair the function of forming a predetermined thin film with good coverage and symmetry on the bottom and side surfaces of the holes and trenches formed on the surface of the substrate to be processed, and using the target. It is an object of the present invention to provide a sputtering apparatus and a sputtering method capable of improving efficiency.
- a substrate to be processed is provided with a vacuum chamber in which a target is arranged, a plasma atmosphere is formed in the vacuum chamber to sputter the target, and sputtered particles scattered from the target are arranged in the vacuum chamber.
- the sputtering apparatus of the present invention for depositing and depositing on a surface to form a predetermined thin film is a material of the same kind as the target, at least at a predetermined surface in the vacuum chamber where the sputtered particles scattered from the target adhere to a predetermined position. It is characterized in that a manufactured adherend is provided, and a bias power source for applying a bias voltage having a negative potential when the plasma atmosphere is formed is connected to the adherent.
- a rare gas such as argon is introduced at a predetermined flow rate into a vacuum chamber being evacuated and a target is supplied with a predetermined electric power having a negative potential, a plasma atmosphere is generated in the vacuum chamber.
- the target surface is formed by the ions of the rare gas in the plasma atmosphere, the target surface is sputtered, and the sputtered particles are scattered, and a part of the sputtered particles also adheres to the surface of the adherend.
- the attachment surface of the sputtered particles is made of the same material as that of the target, when a bias voltage is applied to the attachment body, the attachment surface is also sputtered by the ions of the rare gas in the plasma atmosphere and the above-mentioned sputtering is performed.
- Sputtered particles of the same type as the particles (hereinafter, referred to as “resputtered particles”) scatter, and a part of them also adheres to the target surface.
- resputtered particles Sputtered particles of the same type as the particles
- resputtered particles scatter, and a part of them also adheres to the target surface.
- a part of the sputtered particles scattered toward other than the substrate to be processed is once attached to the adherent and collected, and the adhering surface to which the sputtered particles are adhered is also sputtered to form the adhered sputtered particles.
- the application of the bias voltage to the adherend can be performed not only during the sputtering of the target but also separately as a separate step after the film formation by the sputtering of the target is completed.
- the target is a first target
- the adherent is a plate-shaped second target made of the same material as the first target
- the first target and the substrate to be processed are arranged to face each other in a vacuum chamber.
- the second target is installed facing the first target in the space between the first target and the substrate to be processed, and allows the second target to penetrate the second target in the plate thickness direction and allow sputtered particles to pass therethrough. It is preferable that the first through hole is provided.
- the second target which is an adherent
- more of the sputter particles scattered from the first sputter particles can be adhered to the second target and collected. Therefore, more resputtered particles can be returned to the surface of the first target, and the utilization efficiency of the first target can be further enhanced.
- the sputtered particles scattered from the first target pass through the first through hole formed in the second target and are incident on the substrate to be processed, a thin film is formed on the surface of the substrate to be processed with a good in-plane distribution of the film thickness.
- the second target itself is incident on the substrate to be processed beyond a predetermined angle with respect to an imaginary line extending in a direction orthogonal to the surface of the substrate to be processed. It functions as a collimator to control the sputtered particles that can be formed and can form a predetermined thin film with good coverage and symmetry when forming a film on the bottom and side surfaces of holes and trenches formed on the surface of the substrate to be processed. ..
- This is advantageous because it is not necessary to set a long T/S distance as in the LTS type sputtering apparatus described above, the apparatus configuration can be downsized, and the film formation rate can be improved.
- the direction from the substrate to be processed toward the first target is an upward direction
- the first target and the substrate to be processed are offset in a direction orthogonal to the vertical direction
- the substrate to be processed is rotatable.
- a space between the second target and the stage be provided with a ground potential electrode plate having a second through hole that allows passage of sputtered particles. According to this, it is possible to prevent a problem that a plasma atmosphere is formed in the space between the second target and the substrate to be processed and the lower surface of the second target is sputtered.
- the sputtering method of the present invention using the above-mentioned sputtering apparatus, at the same time as the target is sputtered to deposit the sputtered particles on the adherent, the adherent is applied to the target. And applying a bias potential lower than a voltage to re-attach the sputtered particles attached to the attachment to the target.
- the sputtering method of the present invention using the above-mentioned sputtering apparatus comprises a first step of sputtering the target to attach sputtered particles to the adherent, and a bias potential to the adherent. And a second step of re-attaching the sputtered particles attached to the attachment to the target.
- the typical sectional view showing the sputtering device of an embodiment of the present invention The typical top view of the 2nd target shown in FIG.
- the typical sectional view showing the sputtering device concerning the modification of the present invention The typical top view of the distribution plate shown in FIG.
- a target is made of Cu
- a silicon oxide film is formed on a surface of a silicon wafer as a target substrate with a predetermined thickness
- the silicon oxide film has, for example, an aspect ratio of 3 or more.
- the sputtering apparatus of the present invention will be described by taking as an example the case where a fine recess is formed in a predetermined pattern (hereinafter referred to as “substrate Sw”) and a Cu film is formed on the surface of the substrate Sw including the bottom surface and the side surface of the recess. Will be described.
- terms indicating directions such as “up” and “down” are based on the installation posture of the sputtering apparatus shown in FIG. 1.
- SM is the sputtering device of this embodiment.
- the sputtering apparatus SM includes a vacuum chamber 1 capable of forming a vacuum atmosphere.
- a vacuum evacuation unit Pu composed of a turbo molecular pump or a rotary pump is connected.
- a gas introduction pipe 12 for introducing a sputtering gas into the vacuum chamber 1 is connected to the side wall of the vacuum chamber 1.
- a mass flow controller 13 is provided in the gas introduction pipe 12 and communicates with a gas source (not shown).
- the sputtering gas includes not only a rare gas such as argon gas introduced when forming a plasma atmosphere in the vacuum chamber 1, but also a reactive gas such as oxygen gas or nitrogen gas.
- the sputter gas whose flow rate is controlled by the mass flow controller 13 can be introduced into the vacuum chamber 1 which is evacuated at a constant evacuation speed by the vacuum evacuation unit Pu, and the pressure in the vacuum chamber 1 (total Pressure) is kept substantially constant.
- Cathode unit 2 is detachably attached to the upper opening of the vacuum chamber 1.
- the cathode unit 2 is made up of a metal (Cu) target 21 and a magnet unit 22 arranged above the target 21.
- the target 21 is formed to have a circular contour according to the contour of the substrate Sw, and an insulator provided on the upper side wall of the vacuum chamber 1 with the sputtering surface 21b facing downward in a state of being bonded to the backing plate 21a. It is attached to the upper part of the vacuum chamber 1 via 31.
- the target 21 is connected to an output 21d from a sputtering power source 21c composed of a direct current power source and a high frequency power source so that a predetermined power having a negative potential can be supplied.
- the magnet unit 22 generates a magnetic field in the space below the sputtering surface 21b of the target 21, captures the electrons and the like ionized below the sputtering surface 21b during sputtering, and efficiently ionizes the sputtered particles scattered from the target 21. It has a closed magnetic field or a cusp magnetic field structure.
- a plate-shaped yoke 22a made of a magnetic material, a plurality of central magnets 22b of the same magnetization arranged in a ring on the lower surface of the yoke 22a, and a central magnet 22b. It is possible to use a magnet composed of a plurality of peripheral magnets 22c having the same magnetization and arranged in a ring so as to surround the periphery.
- the rotation shaft 23a of the motor 23 is connected to the upper surface of the yoke 22a so that the magnet unit 22 can be rotated around the center of the target 21 during the film formation.
- a stage 4 that holds the substrate Sw in a state of being offset from the center of the target 21 in one radial direction (left and right direction in the drawing) at a predetermined interval.
- the distance (offset amount) d between the virtual line L1 that passes through the center of the target 21 and extends in the vertical direction and the virtual line L2 that passes through the center of the substrate Sw and extends in the vertical direction corresponds to the size of the target 21 and the substrate Sw. It is appropriately set in consideration.
- a chuck plate 41 to which an electrode (not shown) for an electrostatic chuck is assembled is provided on the stage 4, and a substrate Sw is formed on the surface of the chuck plate 41 by applying a predetermined DC voltage to the electrode.
- a rotation shaft 42a of a motor 42 that penetrates the lower wall of the vacuum chamber 1 is connected to the center of the lower surface of the stage 4 via a vacuum seal member (not shown) so that the substrate Sw can be rotated at a predetermined rotation speed during film formation. It has become.
- the stage 4 is provided with a coolant circulation path, a heater, and the like, so that the substrate Sw can be controlled to a predetermined temperature during film formation.
- a deposition preventive plate 5 made of a known material such as alumina or stainless steel is provided to prevent the sputtered particles scattered by the sputtering of the target 21 from adhering to the inner wall surface of the vacuum chamber 1.
- the deposition-inhibitory plate 5 has a cylindrical contour and is suspended via a locking portion 32 provided on the side wall of the vacuum chamber 1.
- the sputtered particles scattered from the target 21 are made to face the target 21 in the space between the target 21 and the stage 4, and at least the sputtered particle adhesion surface 61 a is the same as the target 21.
- the metal attachment body 61 is provided.
- the adhering body 61 is composed of a plate-shaped second target 61 made of the same metal (made of Cu) as the target 21 (hereinafter, referred to as “first target 21”).
- the second target 61 is supported by, for example, an insulator 33 provided on the side wall of the vacuum chamber 1, and the distance from the lower surface (sputtering surface) 21b of the first target 21 to the upper surface (adhesion surface) 61a of the second target 61 is It is set in the range of 25 mm to 250 mm. If it is shorter than 25 mm, the problem that the lower surface of the second target 61 is sputtered occurs. On the other hand, if it is longer than 250 mm, a large amount of sputtered particles adhere to the deposition-inhibitory plate 5.
- the second target 61 is provided with a plurality of first through holes 61b that penetrate the second target 61 in the vertical direction (plate thickness direction) and allow passage of sputtered particles.
- one first through hole 61b is provided in the center of the second target 61, and six first through holes 61b are provided radially outside thereof in the circumferential direction at equal intervals.
- the hole diameter and number of the first through holes 61b and the arrangement of the first through holes 61b are appropriately set in consideration of the film thickness distribution when the film is formed on the substrate Sw.
- the aperture ratio of the first through hole 61b is preferably set to 15% to 75%.
- the plurality of first through holes 61b may be opened so that the respective hole diameters are different.
- bias voltage a negative DC potential (hereinafter referred to as “bias voltage”) lower than a DC voltage applied to the first target 21 during formation of a plasma atmosphere during film formation. That is, the bias power having the above) is input.
- the bias voltage applied to the second target 61 is set so that the ratio to the DC voltage is in the range of 2% to 90%.
- the ratio of the bias voltage to the DC voltage is out of the above range, for example, the sputtering of the second target 61 becomes more dominant than the sputtering of the first target 21, and the amount of sputtered particles contributing to the film formation decreases, and as a result, The Cu film may not be formed in a predetermined film thickness, or the film forming rate may be significantly reduced.
- the sputtering apparatus SM has a known control means (not shown) including a microcomputer, a sequencer, etc., and operates the vacuum evacuation means Pu, the mass flow controller 13, the sputtering power supply 21c, the motor 23, The operation of 42, the operation of the bias power source 62, the operation of the moving means 72, which will be described later, and the like are collectively controlled.
- the film forming method will be described below by taking the case of forming a Cu film on the surface of the substrate Sw by the sputtering apparatus SM as an example.
- the vacuum exhaust means Pu is operated to exhaust the vacuum chamber 1 to vacuum.
- the substrate Sw is transferred onto the stage 4 by a vacuum transfer robot (not shown), and the substrate Sw is placed on the chuck plate 41 of the stage 4.
- a predetermined voltage is applied to the electrodes of the chuck plate 41 to electrostatically adsorb the substrate Sw on the chuck plate 41.
- the argon gas as the sputtering gas is supplied through the gas introduction pipe 12 at a constant flow rate (for example, the argon partial pressure is 0. 5 Pa) and at the same time, a predetermined electric power (for example, 5 to 30 kW) having a negative potential (for example, 600 V) is applied to the first target 21 from the sputtering power source 21c.
- a predetermined electric power for example, 5 to 30 kW
- a negative potential for example, 600 V
- a part of the sputtered particles scattered by the sputtering of the first target 21 also adheres to the upper surface (adhesion surface) 61a of the second target 61, but a bias voltage (for example, from the bias power supply 62) to the second target 61 (for example, 100 to 150 V), the adhesion surface 61a of the second target 61 is also sputtered by the ions of the argon gas in the plasma, and the resputtered particles are scattered, part of which is the sputter surface 21b of the first target 21. Adhere to. The resputtered particles attached to the sputter surface 21b are again sputtered, and a part of the sputtered particles scattered by the sputtering adheres to the surface of the substrate Sw.
- a bias voltage for example, from the bias power supply 62
- a part of the sputtered particles scattered toward the substrate Sw is once attached to the attachment surface 61a of the second target 61 and collected, and the attachment surface 61a to which the sputtered particles are attached is also sputtered. Then, by returning (reducing) the resputtered particles including the attached sputtered particles to the sputtering surface 21b of the first target 21, it is possible to improve the utilization efficiency of the first target 21. Moreover, since the second target 61 faces the first target 21, most of the sputtered particles scattered from the first target 21 that do not contribute to film formation are attached to the attachment surface 61a of the second target 61. It can be recovered. Therefore, more resputtered particles can be returned to the sputtering surface 21b of the first target 21, and the utilization efficiency of the first target 21 can be further enhanced.
- the second target 61 itself is in a direction orthogonal to the surface of the substrate Sw. It functions as a collimator that regulates sputtered particles that enter the substrate Sw beyond a predetermined angle with respect to the imaginary line L1 that extends to the bottom surface and side surfaces of recesses such as holes and trenches formed on the surface of the substrate Sw. In such a case, a predetermined thin film can be formed with good coverage and symmetry. As a result, unlike the LTS type sputtering apparatus, it is not necessary to set a long T/S distance, the apparatus configuration can be downsized, and the film formation rate can be improved, which is advantageous.
- the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.
- the film thickness distribution of the thin film formed on the surface of the substrate Sw may be uneven depending on the arrangement of the first through holes 61b in the second target 61 and the like. Therefore, as in the sputtering device according to the modified example shown in FIG. 3, sputtered particles passing through the first through holes 61b of the second target 61 toward the substrate Sw in the space between the second target 61 and the stage 4.
- a distribution plate 7 may be provided to regulate a part of the. As shown in FIG.
- the distribution plate 7 is formed with an opening 71 having a fan-shaped contour that allows passage of sputtered particles to the substrate Sw side. That is, the opening 71 has its opening area gradually increasing outward from the starting point 71a at a predetermined position (for example, a position corresponding to the center of the substrate Sw) of the distribution plate 7 in the radial direction. There is.
- the central angle ⁇ of the opening 71 is appropriately set according to the film thickness distribution.
- the opening 71 may be formed as a notch, and the opening 71 is not limited to being provided at one location of the distribution plate 7, and may be provided as a plurality of openings separately.
- the drive shaft 72a of the moving means 72 is connected to the side surface of the distribution plate 7 so that the distribution plate 7 can be moved along the offset direction of the substrate Sw with respect to the center of the first target 21 (left-right direction in FIG. 1). May be.
- the electrode plate 8 at the ground potential is provided facing the second target 61. This prevents a problem that a plasma atmosphere is formed in the space between the second target 61 and the substrate Sw and the lower surface of the second target 61 is sputtered.
- the electrode plate 8 is provided with a plurality of second through holes 81 corresponding to the first through holes 61b of the second target 61 and allowing passage of the sputter particles. Is attached to the substrate Sw through the first through hole 61b of the second target 61 and the second through hole 81 of the electrode plate 8.
- the substrate Sw in order to form a thin film on the surface of the relatively large substrate Sw using the relatively small first target 21, the substrate Sw may be offset from the center of the first target 21 in the radial direction.
- the present invention can be applied to the case where the center of the first target 21 and the center of the substrate Sw are located on the same line.
- the second target 61 itself functions as a collimator that restricts sputtered particles that enter the substrate Sw beyond a predetermined angle with respect to an imaginary line that connects the centers of the substrate Sw and the first target 21. It is not necessary to set the T/S distance long.
- the present invention is not limited to this.
- the present invention can be applied to the case of forming a metal film such as Al other than the above, or the case of forming an insulator film such as alumina.
- the discharge between the first target 21 and the second target 61 becomes unstable. There are cases. In this case, in order to stabilize the discharge, an output of a power supply that applies a voltage having a positive potential is connected to the deposition-inhibiting plate 5 which is normally at the ground potential so that the deposition-inhibiting plate 5 also serves as a shield. You may comprise.
- the bias voltage is applied to the adherend (second target) 61 during the sputtering of the first target 21, but as a separate step, after the film formation by the sputtering of the first target 21 is completed, it is performed independently. It can also be done in. That is, the first step of sputtering the first target 21 to attach the sputtered particles to the second target (adhesive body) 61, and applying the bias potential to the first target 21 to the second target 61 to the second target 61. A second step of redepositing the sputtered particles attached to the first target onto the first target. In this case, the bias potential applied to the second target 61 does not need to be lower than the voltage applied to the first target 21.
- the deposition preventive plate 5 is formed of the same kind of material as the first target 21, or the inner peripheral surface (adhesion surface) of the deposition preventive plate 5 to which the sputtered particles adhere is covered with the same kind of material as the first target 21, A bias power source may be connected to the deposition preventing plate 5.
- SM... Sputtering apparatus Sw... Substrate (processed substrate), 1... Vacuum chamber, 21... Target, 1st target, 4... Stage, 61... Adhesive body, 2nd target, 61a... Adhesion surface, 61b... 1st transparent Holes, 62... Bias power supply, 7... Distribution plate, 8... Electrode plate, 81... Second through holes.
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Abstract
Description
Claims (7)
- ターゲットが配置される真空チャンバを備え、真空チャンバ内にプラズマ雰囲気を形成してターゲットをスパッタリングし、ターゲットから飛散したスパッタ粒子を真空チャンバ内に配置される被処理基板表面に付着、堆積させて所定の薄膜を成膜するスパッタリング装置において、
ターゲットから飛散したスパッタ粒子が付着する真空チャンバ内の所定位置に、少なくともスパッタ粒子の付着面をターゲットと同種の材料製とした付着体を設け、
付着体に、プラズマ雰囲気の形成時に負の電位を持ったバイアス電圧を印加するバイアス電源が接続されることを特徴とするスパッタリング装置。 - 請求項1記載のスパッタリング装置であって、前記ターゲットを第1ターゲット、前記付着体を第1ターゲットと同種の材料製である板状の第2ターゲットとし、第1ターゲットと被処理基板とが真空チャンバ内で対向配置されるものにおいて、
第2ターゲットは、第1ターゲットと被処理基板との間の空間で第1ターゲットに対向させて設置され、第2ターゲットに、その板厚方向に貫通してスパッタ粒子の通過を許容する第1透孔が開設されていることを特徴とするスパッタリング装置。 - 前記第1透孔が、複数の透孔から構成されることを特徴とする請求項2記載のスパッタリング装置。
- 請求項2または請求項3記載のスパッタリング装置であって、前記被処理基板から前記第1ターゲットに向かう方向を上とし、前記第1ターゲットと前記被処理基板とが上下方向に直交する方向にオフセットされ、前記被処理基板を回転自在に保持するステージを更に備えるものにおいて、
第2ターゲットと前記ステージとの間の空間に、第2ターゲットの第1透孔を通過して被処理基板に向かうスパッタ粒子の一部を規制する分布板が設けられることを特徴とするスパッタリング装置。 - 第2ターゲットと前記ステージとの間の空間に、スパッタ粒子の通過を許容する第2透孔が開設された接地電位の電極板が設けられることを特徴とする請求項4記載のスパッタリング装置。
- 請求項1記載のスパッタリング装置を用いたスパッタリング方法であって、
前記ターゲットをスパッタリングして前記付着体にスパッタ粒子を付着させると同時に、前記付着体に前記ターゲットに印加される電圧より低いバイアス電位を印加して前記付着体に付着したスパッタ粒子を前記ターゲットに再付着させる工程を含むことを特徴とするスパッタリング方法。 - 請求項1記載のスパッタリング装置を用いたスパッタリング方法であって、
前記ターゲットをスパッタリングして前記付着体にスパッタ粒子を付着させる第1の工程と、
前記付着体にバイアス電位を印加して前記付着体に付着したスパッタ粒子を前記ターゲットに再付着させる第2の工程とを含むことを特徴とするスパッタリング方法。
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