WO2014064741A1 - マグネトロンスパッタ装置およびマグネトロンスパッタ方法 - Google Patents
マグネトロンスパッタ装置およびマグネトロンスパッタ方法 Download PDFInfo
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- WO2014064741A1 WO2014064741A1 PCT/JP2012/006899 JP2012006899W WO2014064741A1 WO 2014064741 A1 WO2014064741 A1 WO 2014064741A1 JP 2012006899 W JP2012006899 W JP 2012006899W WO 2014064741 A1 WO2014064741 A1 WO 2014064741A1
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- magnet
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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
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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
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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
-
- 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
-
- 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
- H01J37/3455—Movable magnets
Definitions
- the present invention relates to a magnetron sputtering apparatus and a magnetron sputtering method.
- a process of forming a thin film made of metal or an insulator on a substrate is required.
- a film forming method using a sputtering apparatus is used.
- an inert gas such as argon gas is converted into plasma by direct current high voltage or high frequency power, and the target, which is a raw material for forming a thin film, is activated, melted and scattered by this plasma gas, and deposited on the substrate.
- Patent Document 1 a magnetron sputtering apparatus using a magnet rotation mechanism that can increase the deposition rate and improve target utilization efficiency to reduce production cost and enable stable long-term operation.
- This device includes a magnet array composed of a plurality of magnets spirally arranged on the outer periphery of a rotating shaft so that magnetic poles of the same polarity face outward, and a fixed magnet provided around the magnet array facing a target By rotating the magnet array around the rotation axis, the magnetic field loop of the horizontal magnetic field horizontal to the target surface formed in the vicinity of the target surface is moved in the rotation axis direction to increase the deposition rate and the target. Improve usage efficiency.
- the amount of magnets to be used becomes enormous, resulting in a significant increase in apparatus cost.
- the force acting between the magnets also increases, making it difficult to ensure stable operation of the apparatus.
- One of the objects of the present invention is to increase the erosion region as the target area increases, particularly in the width direction of the target, while minimizing the amount of magnet used in the magnetron sputtering apparatus using the magnet rotation mechanism. It is to provide an apparatus that can be increased, and a magnetron sputtering method using the apparatus.
- the magnetron sputtering apparatus of the present invention includes a target arranged to face a plasma formation space, It is arranged on the opposite side of the plasma formation space with respect to the target, is arranged in a spiral around a rotation axis along the surface of the target on the plasma formation space side, and the N pole faces radially outward.
- a first magnet array comprising a plurality of magnets;
- a second magnet array composed of a plurality of magnets arranged in a spiral around the rotation axis and in parallel with the first magnet array, with the south pole facing radially outward;
- the first and second magnets are arranged around the first and second magnet arrays, are formed of magnets having N or S poles on the side facing the target, and rotate.
- a magnet rotation mechanism that supports the first and second magnet rows and rotates the first and second magnet rows around the rotation axis; When viewed from the target side, in a direction crossing the rotational axis direction, at least a part is disposed between the outer periphery of the first and second magnet rows and the fixed magnet, and along the rotational axis direction.
- a plurality of magnetic induction members that are arranged and draw magnetic field lines coming out of the first magnet row and lead the magnetic force lines to the target side, or draw magnetic line rays coming from the target side and lead to the second magnet row, It is characterized by that.
- the plasma formed in the plasma forming space near the surface of the target is rotated by rotating the first and second magnet arrays using the magnetron sputtering apparatus described above.
- the target material is deposited on the substrate to be processed while being confined in the vicinity.
- the magnetic field of a magnet that is relatively distant from the target among the plurality of magnets constituting the rotating first and second magnet arrays is effectively utilized as a magnetic field for confining plasma.
- the erosion region can be expanded in the width direction of the target as the target area is expanded while minimizing the amount of magnet used.
- the film formation rate and throughput can be improved.
- Sectional drawing which shows an example of a magnetron sputtering device.
- the perspective view which shows the magnet rotation mechanism in FIG. 1, a magnet row
- Sectional drawing of the magnetron sputtering apparatus which concerns on one Embodiment of this invention It is a figure which shows the magnet rotation mechanism, magnet row
- FIG. 10 is a diagram for explaining the operation of the magnetic induction member, and is a cross-sectional view in the XA-XA direction of FIG. 9.
- FIG. 10 is a diagram for explaining the operation of the magnetic induction member, and is a cross-sectional view in the XB-XB direction of FIG. 9.
- FIG. 10 is a view for explaining the operation of the magnetic induction member, and is a cross-sectional view in the XC-XC direction of FIG. 9. Sectional drawing corresponding to FIG.
- FIG. 10A which shows distribution of the line of magnetic force when there is no magnetic induction member.
- Sectional drawing corresponding to FIG. 10B which shows distribution of the magnetic force line
- the graph which shows the relationship between the opening width of a fixed magnet, and the intensity
- the schematic diagram which shows the magnetic induction member which concerns on other embodiment of this invention.
- FIG. 1 is a view showing an example of a magnetron sputtering apparatus to which the present invention is applied
- FIG. 2 is a perspective view showing a magnet rotation mechanism, a magnet row, and a fixed magnet of the apparatus of FIG.
- This apparatus comprises a target 21 arranged to face the plasma formation space SP, a magnet rotation mechanism 30, a plurality of magnets 34 constituting a first magnet row 33 described later, and a second magnet row 35 described later.
- a plurality of magnets 36 and fixed magnets 35 arranged around the first and second magnet rows 33 and 35.
- 40 is a backing plate to which the target 21 is bonded
- 50 is a magnetic cover
- 51 is an RF power source for plasma excitation
- 52 is a blocking capacitor
- 53 is for plasma excitation and target DC voltage control.
- DC power source 60 is an aluminum cover
- 55 is a feeder line for supplying power to the target 21 through the aluminum cover 60 and the backing plate 40
- 90 is a substrate to be processed
- 200 is a substrate to be processed 90, and this is installed. It is a moving stage to be moved.
- the magnet rotation mechanism 30 has a hollow rotation shaft 31, supports the first and second magnet rows 33, 35 on the outer peripheral surface of the rotation shaft 31, and the first and second magnet rows 33, 35. Rotate around the rotation axis Ct.
- the rotary shaft 31 has a regular hexagonal outer shape in cross section, and a plurality of magnets 34 and 36 are attached to each surface. Both ends of the rotary shaft 31 are rotatably supported by a support mechanism (not shown), and one end can be rotated by being connected to a gear unit and a motor (not shown).
- the material of the rotating shaft 31 may be ordinary stainless steel or the like, but it is preferable that a part or all of it is made of a ferromagnetic material having a low magnetic resistance, such as a Ni—Fe high permeability alloy or iron.
- the material for forming the rotating shaft 31 is iron.
- the first magnet row 33 is disposed on the opposite side of the target 21 from the plasma formation space SP, and around the rotation axis Ct along the surface of the target 21 on the plasma formation space SP side. And a plurality of magnets 34 whose N poles face radially outward.
- the second magnet array 35 includes a plurality of magnets 36 that are spirally arranged around the rotation axis Ct, are parallel to the first magnet array 33, and the south pole faces radially outward.
- Each of the magnets 34 and 36 is a plate-like magnet, and preferably a magnet having a high residual magnetic flux density, a coercive force, and an energy product is used in order to stably generate a strong magnetic field.
- an Sm—Co based sintered magnet having a residual magnetic flux density of about 1.1 T, and an Nd—Fe—B based sintered magnet having a residual magnetic flux density of about 1.3 T are suitable.
- an Nd—Fe—B based sintered magnet is used.
- Each magnet 34, 36 is magnetized in a direction perpendicular to its surface.
- the fixed magnet 35 is disposed so as to surround the first and second magnet arrays 33 and 35 when viewed from the target 21 side, and is formed of a magnet having an S pole on the side facing the target 21.
- a magnet having an N pole on the side facing the target 21 may be used.
- the fixed magnet 35 has the edge part of the part provided in the rotation axis C direction, and the part orthogonal to this connected, you may isolate
- an Nd—Fe—B based sintered magnet is used as for the fixed magnet 35.
- the backing plate 40 is installed on a processing chamber outer wall (not shown) via an insulator (not shown).
- the power frequency of the RF power source 51 is, for example, 13.56 MHz.
- the RF-DC coupled discharge method in which the DC power source can also be applied in an overlapping manner is adopted.
- the DC discharge sputtering method using only the DC power source may be adopted, or the RF discharge sputtering method using only the RF power source may be adopted. It may be adopted.
- the magnetic field that forms this magnetic field pattern acts to confine the plasma near the surface of the target, thereby forming an erosion region that is a sputtered region of the target surface.
- the circumference of the N pole of the first magnet row 33 is approximately the first.
- Two magnet rows 35 and a fixed magnet 38 are surrounded by the south pole.
- the magnetic lines of force from the first magnet row 33 the magnetic lines of force from the magnet 34 that is relatively close to the target 21 pass through the target 21 and then the second magnet row 35 or the fixed magnet 38 that surrounds the target 21. Terminate at the S pole. Therefore, a plurality of closed loop magnetic field patterns 601 are formed on the surface of the target 21.
- the magnetic field pattern 601 is a locus of a region in which the magnetic field component in the direction perpendicular to the surface of the target 21 is zero and only the magnetic field component in the direction horizontal to the surface of the target 21 exists, and this closed loop magnetic field. Since the plasma is confined in the pattern (hereinafter referred to as a horizontal magnetic field loop) 601, the magnetic field pattern 601 coincides with the erosion region.
- the plurality of magnetic field patterns 601 move on the surface of the target 21 in the direction indicated by the arrow as the rotation shaft 31 rotates. Note that, at the end portions of the first and second magnet arrays 33 and 35, an erosion region is sequentially generated from one end portion, and the erosion region moves toward the other end portion, and at the other end portion. It disappears sequentially.
- the usage efficiency of the target 21 is improved.
- the atoms of the target 21 sputtered out in the erosion region reach the substrate 90 to be processed installed on the moving stage 200 and adhere thereto. Thereby, a thin film is formed on the substrate 90 to be processed. It is also possible to form a film while moving the substrate to be processed 90 relative to the target 21 while driving the moving stage 200 on which the substrate to be processed 90 is driven to excite plasma on the surface of the target 21. .
- the opening width in the width direction (direction perpendicular to the rotation axis Ct when viewed from the target side) of the fixed magnet 38 indicated by W1 is set to the first and second magnet rows 33 indicated by D1. , 35, which is approximately the same as the diameter of the magnet array.
- the opening width W1 is increased in order to increase the dimension in the width direction of the target 21, as will be described later, the first and second magnet arrays 33, This is because the magnetic field strength in a region relatively distant from 35 and the fixed magnet 38 decreases, and it becomes difficult to stably confine the plasma on the target surface.
- a magnetron sputtering apparatus that can cope with an increase in the dimension in the width direction of the target 21 without increasing the amount of magnets to be used will be described.
- FIG. 4 is a sectional view showing the magnetron sputtering apparatus according to the first embodiment of the present invention.
- the same components as those in the apparatus of FIG. 1 are denoted by the same reference numerals.
- the opening width W1 of the fixed magnet 38 is formed to be sufficiently larger than the magnet row diameter D1
- the magnetic induction member 11 is provided between the rotating shaft 31 and the fixed magnet 38. Yes.
- the magnetic induction member 11 has a magnetic field strength of a moving horizontal magnetic field loop formed near the surface of the target 21, particularly between the first and second magnet arrays 33 and 35 and the fixed magnet 38. It is provided to increase the magnetic field strength in the region.
- the magnetic induction member 11 is formed of a thin plate member, and the material for forming the magnetic induction member 11 is formed of a magnetic material that generates a magnetic pole by magnetic induction, and preferably has a magnetoresistance. It is made of a low ferromagnetic material such as a Ni—Fe high permeability alloy or iron. In the present embodiment, the magnetic induction member 11 is made of iron. As shown in FIG. 6, the magnetic induction member 11 has a trapezoidal shape in which two corners are perpendicular, and the dimensions A, B, and C shown in FIG. 6 are, for example, 37 mm, 34 mm, and 22 mm, respectively. . The thickness T is, for example, 2 mm.
- the magnetic induction member 11 is rotated between the first and second magnet arrays 33 and 35 and the fixed magnet 38 on both sides of the rotation axis Ct as viewed from the target 21 side.
- a plurality are arranged along the direction of the axis Ct.
- FIG. 7 is a side view of the first and second magnet arrays and the magnetic induction member 11 as viewed from a direction horizontal to the surface of the target 21.
- the magnetic induction member 11 is disposed to be inclined with respect to the rotation axis Ct in accordance with the inclination angle (spiral inclination angle) of the first and second magnet arrays 33 and 35 indicated by ⁇ D in FIG.
- the inclination angle of the spiral is 65 °
- the magnetic induction member 11 is also inclined by 65 ° with respect to the rotation axis Ct.
- the magnetic induction member 11 is arranged in accordance with the spiral inclination angle).
- the magnetic induction member 11 can be arranged so as to be orthogonal to the rotation axis Ct without being inclined with respect to the rotation axis Ct.
- the plurality of magnetic induction members 11 are arranged at a predetermined arrangement pitch P1, and the pitch P1 is, for example, about 4 mm. Further, as can be seen from FIG. 7, the thickness of the magnetic induction member 11 in the direction of the rotational axis Ct is thinner than the width E of the magnets constituting the first and second magnet rows 33 and 35 in the direction of the rotational axis Ct.
- the arrangement pitch P1 of the magnetic induction members 11 in the rotation axis Ct direction is configured to be smaller than the interval F between the first and second magnet rows.
- the width E and the interval F are, for example, 19 mm and 25 mm. Under such dimensional conditions, two or three magnetic induction members 11 are installed in the range of the width E of the first and second magnet rows. The reason why the thickness and the arrangement pitch P1 of the magnetic induction member 11 are configured as described above will be described later.
- the position of the lower end portion (the end portion facing the target 21) of the magnetic induction member 11 is the closest to the target 21 among the magnets of the first and second magnet arrays 33 and 35 in the direction perpendicular to the surface of the target 21. It is set to almost the same height as the nearby magnet.
- a nonmagnetic material such as aluminum or resin is interposed between the plurality of magnetic induction members 11. It is also possible to sandwich a plate-shaped member made of a material. In that case, it is preferable to integrally mold the plurality of magnetic induction members 11 and the plurality of plate-like members.
- the plate-like member is a non-magnetic metal material such as aluminum, it may be fastened with aluminum bolts / nuts or rivets, or may be firmly fixed with a belt-like frame.
- the plate-like member When the plate-like member is a resin, it may be integrally formed by immersing a plurality of magnetic induction members 11 temporarily maintained at equal intervals in a molten resin and solidifying the resin.
- Each of the plurality of magnetic induction members 11 is preferably formed of the same material and the same shape and size as shown in FIG. 6, but is not necessarily the same material, the same shape, May not be the same size. Furthermore, it may depend on other factors, for example, the shape or structural homogeneity of the target 21 and the magnet rotation mechanism 30. Considering these things, the allowable range of the material, shape, and size of the magnetic induction member 11 is such that the plasma formed between the target 21 and the magnet rotation mechanism 30 is homogeneous or substantially homogeneous without location dependence.
- the arrangement intervals of the magnetic induction members 11 are preferably equal intervals, or substantially or effectively equal intervals. However, depending on the homogeneity of the target 21 and the magnet rotation mechanism 30, the equality of the target 21 and the magnet rotation mechanism 30 may hinder the homogeneity of the plasma formed between the target 21 and the magnet rotation mechanism 30. If so, the arrangement interval of the magnetic induction members 11 may be intentionally changed so that the homogeneity of the plasma is maintained. For example, it is preferable to arrange the plurality of magnetic induction members 11 by gradually increasing the arrangement interval toward the center of the magnet rotation mechanism 30 along the rotation axis Ct of the magnet rotation mechanism 30 because the above-described problem can be relatively easily solved. .
- the first and second magnet arrays 33 and 35 are arranged in a spiral shape at an equal pitch along the periphery of the rotation axis Ct is an example of a preferable example.
- it may be arranged in a spiral shape with an unequal pitch, and the unequal pitch is arranged along the rotation axis Ct of the magnet rotation mechanism 30.
- the pitch interval may be continuously widened toward the center and arranged in a spiral shape.
- the width E of the first and second magnet rows is described and illustrated in the same width for convenience of explanation, but the plasma depending on the difference in the magnetic force of the magnets constituting the magnet row or the desired plasma is as intended. It is also a suitable example to make it different so as to be formed. For example, it is desirable to make the width of the N-type magnet row wider than the width of the S-type magnet row according to the difference in the magnetic force of the magnets constituting the magnet row.
- FIG. 8A when two magnets 301 and 302 having opposite magnetic poles are arranged side by side, the magnetic field lines MF emitted from one magnet 301 are attracted and enter the other magnet 302.
- magnetic bodies 401 and 402 having end faces substantially the same as the magnets 301 and 302 are arranged at positions facing the magnets 301 and 302, the magnetic lines of force try to pass through the magnetic body as much as possible due to magnetic induction.
- route of the magnetic force line MF can be extended to the position further distant from the magnets 301 and 302. FIG. However, as shown in FIG.
- a plurality of magnetic bodies 501 having end surfaces narrower than the widths of the end surfaces of the magnets 301 and 302 are arranged at an interval narrower than the width of the end surfaces of the magnets 301 and 302.
- the magnetic body 501 can extend the path of the magnetic lines of force MF to a position further away from the magnets 301 and 302, and even if the magnets 301 and 302 move relative to the magnetic body 501, the path of the extended magnetic lines of force MF Can be maintained. This is because magnetism is not shunted between magnets because the magnetic plates are isolated from each other.
- the minimum horizontal magnetic field strength in the horizontal magnetic field loop region is at least 100 gauss, preferably 200 gauss or more, more preferably 300 gauss or more.
- the minimum horizontal magnetic field strength in the horizontal magnetic field loop region is lowered.
- the magnetic induction member 11 extends the path of the lines of magnetic force formed between the first magnet row 33, the second magnet row 35, and the fixed magnet 38, It acts to increase the magnetic field strength of the horizontal magnetic field loop.
- FIG. 9 is a view of the first and second magnet arrays, the magnetic induction member, and the fixed magnet as seen from the target direction.
- a locus 601 indicated by an alternate long and short dash line is a horizontal magnetic field loop formed on the surface of the target 21.
- 10A is a cross-sectional view taken along line XA-XA along the first magnet row 33 in FIG. 9
- FIG. 10B is a cross-sectional view taken along line XB-XB perpendicular to the XA-XA line in FIG. 9, and
- FIG. 9 is a sectional view taken along line XC-XC along nine second magnet rows 35.
- 10A and 10C show only one half of the magnet row with respect to the rotation axis Ct.
- the lines of magnetic force emitted from the magnets 34 of the first magnet row 33 that are not closest to the surface of the target 21 but relatively far from the surface of the target 21 are derived from the properties of the magnetic material described above.
- the magnetic induction member 11 is attracted to one end of the magnetic induction member 11 disposed between the first magnet row 33 and the fixed magnet 38 and enters the magnetic induction member 11. Since the magnetic lines of force are gathered in a material having as high a permeability as possible and the magnetic lines of force tend to repel each other, the magnetic lines of force that have entered the magnetic induction member 11 pass through the inside of the magnetic induction member 11 to the target side. It is guided and comes out from the lower end of the magnetic induction member 11 toward the target 21.
- the remaining lines of magnetic force MFA from the magnetic induction member 11 are guided to the target 21 side as shown in FIGS. 10A and 10B. And the magnetic force line MFA guided to the surface side of the target 21 is finally terminated as the magnetic force line MFB on the magnet 36 of the second magnet row 35 adjacent in the rotation axis direction. Also in this case, as shown in FIGS. 10B and 10C, the magnetic force lines MFB entering from the target 21 side are attracted to the lower end portion of the magnetic induction member 11 disposed between the second magnet row 35 and the fixed magnet 38. And guided to the magnet 36 of the second magnet array 35 through the inside of the magnetic induction member 11. At that time, as shown in FIG.
- a horizontal magnetic field region (the vertical magnetic field is zero) is formed on the target surface, and the plasma PL is confined there. This corresponds to the position 803 in FIG.
- the opening width W1 of the fixed magnet 38 is expanded by using the magnetic field of the magnet relatively away from the target 21 as the magnetic field for confining the plasma using the magnetic induction member 11. , Can stably excite a wide horizontal magnetic field loop.
- the opening width W1 of the fixed magnet 38 is increased without introducing the magnetic induction member 11
- the lines of magnetic force emitted from the magnet that is not closest to the surface of the target 21 but relatively far from the surface of the target 21 are not directed toward the target 21 as shown in FIG. Diverges in a substantially vertical direction. Some of the magnetic field lines travel toward the fixed magnet 38.
- the magnetic induction member 11 does not exist, it is difficult to form a horizontal magnetic field loop as shown in FIG. 10A and it is difficult to stably confine the plasma PL.
- the magnetic field lines MFA ′ emitted from the N pole of the magnet located at a position away from the surface of the target 21 do not proceed to the target 21 side, but move toward the S pole of the adjacent magnet. This is because it does not go through the surface. Therefore, when the magnetic induction member 11 is not present, even if a strong plasma is excited at the position 801 where the distance between the magnet and the target 21 shown in FIG. 9 is short, the plasma diffuses at the positions 802 and 803 where the horizontal magnetic field is weak. Therefore, it becomes difficult to stably excite plasma.
- FIG. 12 is a graph plotting the intensity of the lowest horizontal magnetic field in the horizontal magnetic field loop when the opening width W1 of the fixed magnet 38 is changed.
- the comparative example shows the strength of the lowest horizontal magnetic field in the horizontal magnetic field loop in an apparatus in which the magnetic induction member 11 is not present.
- the maximum horizontal magnetic field in the horizontal magnetic field loop is about 750 gauss near the center in the width direction of the target, and this hardly changes even when the opening width W1 of the fixed magnet 38 is changed.
- the width of the target 21 was increased to twice the magnet row diameter D1, and the horizontal magnetic field loop could be expanded to the full target width.
- the opening width W1 exceeds about 1.5 times the magnet array diameter D1
- the minimum horizontal magnetic field is less than 100 gauss, and the plasma can be excited stably. It will disappear.
- FIG. 13 is a view showing the structure of a magnetic induction member according to another embodiment of the present invention.
- a plurality of magnetic induction members shown in FIG. 13 are arranged in the direction of the rotation axis Ct.
- a plurality of magnetic induction members are also provided in the rotation direction R1 of the rotation shaft 31.
- each of the magnetic induction members 11A to 11C is curved so that one end thereof faces the magnet of the first magnet row 33 separated from the surface of the target 21 and the other end thereof faces the target 21.
- the magnetic resistance inside the magnetic induction member 11 is isotropic. However, some components diffuse from the right end of FIG. 10A and diffuse in the horizontal direction.
- the magnetic induction members 11A to 11C are divided into a plurality of portions in the rotation direction R1, and the shape thereof is a curved shape from the first magnet row 33 toward the surface of the target 21, so It is possible to reduce the diffusion rate and efficiently guide the magnetic field lines to the target surface.
- the width of the magnetic induction member is narrower than the width of the opposing magnets in both the direction of the rotation axis C and the direction of the rotation direction R1, and the arrangement pitch is such that at least two are arranged between the magnet width and the magnets. Size is preferred.
- the spiral magnet rows are two rows, but the present invention is not limited to this.
- the magnetic induction member is disposed between the outer periphery of the magnet array and the fixed magnet when viewed from the target side, but at least a part of the magnetic induction member is disposed between the outer periphery of the magnet array and the fixed magnet. It is sufficient that the magnetic induction member overlaps the magnet array when viewed from the target side.
- the magnetron sputtering apparatus can be used not only to form an insulating film or a conductive film on a semiconductor wafer or the like but also to form various films on a substrate such as a glass of a flat display device. And can be used for sputter deposition in the manufacture of storage devices and other electronic devices.
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Abstract
Description
前記ターゲットに対して前記プラズマ形成空間とは反対側に配置され、前記ターゲットのプラズマ形成空間側の表面に沿った回転軸線の周りに螺旋状に配列され、かつ、N極が半径方向外側を向く複数の磁石からなる第1の磁石列と、
前記回転軸線の周りに螺旋状に配列されるとともに前記第1の磁石列に並列し、S極が半径方向外側を向く複数の磁石からなる第2の磁石列と、
前記ターゲット側から見て、前記第1および第2の磁石列の周囲に配置され、前記ターゲットに対向する側にN極又はS極を有する磁石で形成され、回転する前記第1および第2の磁石列と協働して、前記ターゲットの表面を前記回転軸線の方向に移動するループ状の磁場パターンを形成するための固定磁石と、
前記第1および第2の磁石列を支持して、前記第1および第2の磁石列を前記回転軸線を中心に回転させる磁石回転機構と、
前記ターゲット側から見て、前記回転軸線方向を横切る方向において、前記第1および第2の磁石列の外周と前記固定磁石との間に少なくとも一部が配置されるとともに前記回転軸線方向に沿って配列され、前記第1の磁石列から出る磁力線を引き寄せて当該磁力線をターゲット側に導き、または、ターゲット側から入る磁力線を引き寄せて前記第2の磁石列へ導く複数の磁気誘導部材とを有する、ことを特徴とする。
図1は本発明が適用されるマグネトロンスパッタ装置の一例を示す図であり、図2は、図1の装置の磁石回転機構、磁石列および固定磁石を示す斜視図である。この装置は、プラズマ形成空間SPに面するように配置されたターゲット21、磁石回転機構30、後述する第1の磁石列33を構成する複数の磁石34、後述する第2の磁石列35を構成する複数の磁石36、第1および第2の磁石列33,35の周囲に配置された固定磁石35を有する。なお、図1において、40はターゲット21が接着されているバッキングプレート、50は磁性体カバー、51はプラズマ励起のためのRF電源、52はブロッキングコンデンサ、53はプラズマ励起およびターゲット直流電圧制御のための直流電源、60はアルミカバー、55はターゲット21にアルミカバー60およびバッキングプレート40を介して電力を供給するためフィーダー線、90は被処理基板、200は被処理基板90が設置されてこれを移動させる移動ステージである。
図1に示したマグネトロンスパッタ装置では、W1で示す固定磁石38の幅方向(ターゲット側から見て回転軸線Ctに直交する方向)の開口幅を、D1で示す第1および第2に磁石列33,35の直径である磁石列径と同等程度にしている。これは、ターゲット21の幅方向の寸法を拡大するために、開口幅W1を拡大すると、後述するように、ターゲット21の表面において、水平磁場ループ601の、第1および第2に磁石列33,35および固定磁石38から相対的に離れた領域の磁場強度が低下し、ターゲット表面にプラズマを安定的に閉じ込めることが困難になるからである。このため、本実施形態では、使用する磁石の量を増加させることなく、ターゲット21の幅方向の寸法の拡大に対応可能なマグネトロンスパッタ装置について説明する。
図13は、本発明の他の実施形態に係る磁気誘導部材の構造を示す図である。図13に示す磁気誘導部材は、第1の実施形態と同様に、回転軸線Ct方向にそれぞれ複数配列されているが、11A~11Cで示すように、回転軸31の回転方向R1においても、複数の磁気誘導部材が配列されている。加えて、磁気誘導部材11A~11Cは、ターゲット21の表面から離れた第1の磁石列33の磁石に一端部が対向し、他端部がターゲット21に対向するように湾曲している。
Claims (4)
- プラズマ形成空間に面するように配置されたターゲットと、
前記ターゲットに対して前記プラズマ形成空間とは反対側に配置され、前記ターゲットのプラズマ形成空間側の表面に沿った回転軸線の周りに螺旋状に配列され、かつ、N極が半径方向外側を向く複数の磁石からなる第1の磁石列と、
前記回転軸線の周りに螺旋状に配列されるとともに前記第1の磁石列に並列し、S極が半径方向外側を向く複数の磁石からなる第2の磁石列と、
前記ターゲット側から見て、前記第1および第2の磁石列の周囲に配置され、前記ターゲットに対向する側にN極又はS極を有する磁石で形成され、回転する前記第1および第2の磁石列と協働して、前記ターゲットの表面を前記回転軸線の方向に移動するループ状の磁場パターンを形成するための固定磁石と、
前記第1および第2の磁石列を支持して、前記第1および第2の磁石列を前記回転軸線を中心に回転させる磁石回転機構と、
前記ターゲット側から見て、前記回転軸線方向を横切る方向において、前記第1および第2の磁石列の外周と前記固定磁石との間に少なくとも一部が配置されるとともに前記回転軸線方向に沿って配列され、前記第1の磁石列から出る磁力線を引き寄せて当該磁力線をターゲット側に導き、または、ターゲット側から入る磁力線を引き寄せて前記第2の磁石列へ導く複数の磁気誘導部材とを有する、ことを特徴とするマグネトロンスパッタ装置。 - 前記複数の磁気誘導部材の各々の前記回転軸線方向の厚さは、前記第1および第2の磁石列を構成する磁石の前記回転軸線方向の幅よりも薄く、前記複数の磁気誘導部材の前記回転軸線方向の配列ピッチは、前記第1および第2の磁石列の間隔よりも小さい、ことを特徴とする請求項1に記載のマグネトロンスパッタ装置。
- 前記複数の磁気誘導部材は、前記磁石回転機構の回転方向に沿って複数配列されている、ことを特徴とする請求項1に記載のマグネトロンスパッタ装置。
- 請求項1から3のいずれかに記載のマグネトロンスパッタ装置を用いて、前記第1および第2の磁石列を回転させて前記ターゲットの表面付近に前記プラズマ形成空間で形成されたプラズマを前記ターゲットの表面付近に閉じ込めつつ、前記ターゲットの材料を被処理基板上に成膜することを特徴とするマグネトロンスパッタ方法。
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| PCT/JP2012/006899 WO2014064741A1 (ja) | 2012-10-26 | 2012-10-26 | マグネトロンスパッタ装置およびマグネトロンスパッタ方法 |
| US14/376,519 US20150235817A1 (en) | 2012-10-26 | 2012-10-26 | Magnetron sputtering apparatus and magnetron sputtering method |
| CN201280070032.8A CN104114742A (zh) | 2012-10-26 | 2012-10-26 | 磁控溅射装置以及磁控溅射方法 |
| KR1020147021539A KR20140116183A (ko) | 2012-10-26 | 2012-10-26 | 마그네트론 스퍼터 장치 및 마그네트론 스퍼터 방법 |
| JP2013541144A JP5424518B1 (ja) | 2012-10-26 | 2012-10-26 | マグネトロンスパッタ装置およびマグネトロンスパッタ方法 |
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| CN108172396B (zh) * | 2016-12-07 | 2021-11-16 | 北京北方华创微电子装备有限公司 | 磁性薄膜沉积腔室及薄膜沉积设备 |
| IT201600126397A1 (it) * | 2016-12-14 | 2018-06-14 | Kenosistec S R L | Macchina per la deposizione di materiale secondo la tecnica di polverizzazione catodica. |
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| JP2000265270A (ja) * | 1999-03-18 | 2000-09-26 | Anelva Corp | スパッタリング装置のマグネトロンカソード |
| WO2007043476A1 (ja) * | 2005-10-07 | 2007-04-19 | Tohoku University | マグネトロンスパッタ装置 |
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| CN101652499B (zh) * | 2007-04-06 | 2013-09-25 | 国立大学法人东北大学 | 磁控溅射装置 |
| JP5390796B2 (ja) * | 2008-06-19 | 2014-01-15 | 国立大学法人東北大学 | マグネトロンスパッタ方法及びマグネトロンスパッタ装置 |
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| JP2000265270A (ja) * | 1999-03-18 | 2000-09-26 | Anelva Corp | スパッタリング装置のマグネトロンカソード |
| WO2007043476A1 (ja) * | 2005-10-07 | 2007-04-19 | Tohoku University | マグネトロンスパッタ装置 |
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| WO2019087724A1 (ja) * | 2017-11-01 | 2019-05-09 | 株式会社アルバック | スパッタリング装置及び成膜方法 |
| JPWO2019087724A1 (ja) * | 2017-11-01 | 2019-12-12 | 株式会社アルバック | スパッタリング装置及び成膜方法 |
| US11056323B2 (en) | 2017-11-01 | 2021-07-06 | Ulvac, Inc. | Sputtering apparatus and method of forming film |
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| CN104114742A (zh) | 2014-10-22 |
| US20150235817A1 (en) | 2015-08-20 |
| JPWO2014064741A1 (ja) | 2016-09-05 |
| JP5424518B1 (ja) | 2014-02-26 |
| KR20140116183A (ko) | 2014-10-01 |
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