WO2010021078A1 - 磁石ユニットおよびマグネトロンスパッタリング装置 - Google Patents
磁石ユニットおよびマグネトロンスパッタリング装置 Download PDFInfo
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- WO2010021078A1 WO2010021078A1 PCT/JP2009/003206 JP2009003206W WO2010021078A1 WO 2010021078 A1 WO2010021078 A1 WO 2010021078A1 JP 2009003206 W JP2009003206 W JP 2009003206W WO 2010021078 A1 WO2010021078 A1 WO 2010021078A1
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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
- H01J37/3405—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
- H01J37/3411—Constructional aspects of the reactor
- H01J37/345—Magnet arrangements in particular for cathodic sputtering apparatus
- H01J37/3452—Magnet distribution
Definitions
- the present invention relates to an improvement in the structure of a magnet unit disposed on the back side of a cathode electrode supporting a target on the front side in sputtering, and a magnetron sputtering apparatus provided with the magnet unit.
- a magnetron is generated on a target discharge surface by a magnet unit disposed on the back side of a cathode electrode supporting a target to confine and densify plasma. Then, ions of plasma generated in this apparatus collide with the target, and the target material is repelled and attached to the substrate, whereby a thin film is formed.
- the deposition rate strongly depends on the electric field applied to the target and the leakage magnetic field strength.
- the magnetron strength of the magnet unit strongly affects the plasma density and affects the film thickness distribution of the thin film formed on the substrate.
- the higher the magnetron intensity the higher the plasma density of the corresponding target and the higher the sputtering rate, so the deposition rate of the corresponding substrate position also rises.
- FIG. 15 is an explanatory view showing a magnetron sputtering apparatus which performs film formation while passing a substrate in front of a target.
- the substrate 87 is passed so as to be orthogonal to the generally rectangular target 86 in the longitudinal direction. Therefore, as shown in (C), the sputtered particles from both ends in the longitudinal direction of the target 86 are small, and as shown in (B), the film thickness decreases at both ends of the substrate 87 and the film thickness distribution is deteriorated. I was invited. Therefore, as shown in (D), in order to improve the deterioration of the film thickness distribution, the length in the longitudinal direction of the target 86 is increased, and the cathode electrode and the magnet unit 80 are extended correspondingly. It has corresponded.
- the substrate comprises a central magnet and an annular outer peripheral magnet surrounding the central magnet and having a polarity different from that of the central magnet, forming T-shaped portions at both ends of the central magnet and expanding the magnetic tracks at both ends.
- a technique for improving the film thickness distribution of the above thin film has been proposed (see Patent Document 2).
- the present invention provides a magnet unit and a magnetron sputtering apparatus capable of making the film thickness distribution of a thin film formed on a substrate uniform regardless of the magnetic properties of the target and without increasing the target length and width.
- the purpose is to
- a yoke made of a ferromagnetic plate material, an annular outer peripheral magnet disposed along the contour of the target on the yoke, and the outer peripheral magnet on the yoke
- An inner magnet which is disposed inside the outer circumferential magnet and has a polarity different from that of the outer circumferential magnet, and a group of areas where tangents of magnetic lines of force generated on the target by the outer circumferential magnet and the inner magnet are parallel to the target surface
- n is 2 or more positive And n-1 projecting magnetic poles positioned between the n extending magnetic pole portions and protruding inward in the longitudinal direction from the inner sides of both ends of the outer peripheral magnet
- the n extended magnetic pole portions and the n-1 protruding magnetic pole portions form a number of
- the number n of the extending magnetic pole portions of the inner magnet and the number n-1 of the protruding magnetic pole portions of the outer peripheral magnet cause the number of 2n-1 folded shapes at both ends in the longitudinal direction of the magnetic track. It is formed. Therefore, the magnetic lines of force at both end portions in the longitudinal direction of the magnetic track are compensated by the number of 2n-1 folds, and film formation is performed on the substrate regardless of the magnetic characteristics of the target and without increasing the target length.
- the film thickness distribution of the thin film can be made uniform.
- FIG. 1 is a schematic view showing a schematic configuration of a magnetron sputtering apparatus according to the present invention.
- FIG. 2 is a schematic view showing an example of a mechanism for passing a substrate.
- FIG. 3 is a schematic view showing another example of the mechanism for passing the substrate.
- the sputtering apparatus 1 of the present embodiment is provided with a vacuum vessel 2 that defines a processing chamber capable of vacuum evacuation.
- An exhaust device such as an exhaust pump is connected to the exhaust port 3 of the vacuum vessel 2 via a conductance valve (not shown) or the like.
- a gas introduction system 4 provided with a flow rate controller or the like as an introduction means for a processing gas (process gas) is connected to the vacuum vessel 2, and the processing gas is supplied from this gas introduction system 4 at a predetermined flow rate.
- a single gas or a mixed gas containing a rare gas such as argon (Ar) or nitrogen (N 2 ) can be used.
- the vacuum vessel 2 includes a stage 5 for supporting a substrate, and a cathode electrode (not shown) disposed to face the substrate and supporting a target 6 on the front side.
- the material of the target 6 supported on the front side of the cathode electrode is, for example, a single composition of tantalum (Ta), copper (Cu), titanium (Ti) or the like, or two or more of GeSbTe or NiFe.
- the thing of the composite composition which consists of a composition can be used.
- the target 6 may be a nonmagnetic material such as Ta or Cu, or a magnetic material such as NiFe.
- the target 6 of the present embodiment is, for example, a rectangular (rectangular) plate material, and is joined to the front surface (lower surface) of the main body of the cathode electrode.
- the cathode electrode is connected to, for example, a high frequency power source or the like to which a variable voltage can be applied via a matching circuit (all not shown).
- a magnet unit 10 is disposed on the back side of the cathode electrode, and this magnet unit 10 can form plasma with high density. That is, the sputtering apparatus 1 of the present embodiment introduces a processing gas into the processing chamber in the vacuum vessel 2 and applies a high voltage to the cathode electrode from a high frequency power source or the like (electric power for discharge) Form a magnetic field. Thus, the sputtering apparatus 1 generates plasma in the processing chamber to form a thin film of the target material on the substrate. Of course, plasma may be generated by direct current discharge, pulse discharge, or the like. The detailed structure of the magnet unit 10 will be described later.
- a transport mechanism 15 for passing the substrate is disposed in front of the target 6.
- the substrate transport mechanism 15 is configured of, for example, a strip-shaped guide rail.
- the guide rails 15 extend in a direction orthogonal to the longitudinal direction of the target 6, support a plurality of substrates 7 thereon, and sequentially guide them on the stage 5. Then, in the sputtering apparatus 1 of the present embodiment, the film formation is performed while the substrate 7 to be processed passes through in front of the target 6.
- the sputtering apparatus 1 can simultaneously perform sputtering and substrate transportation.
- the stage 5 may have a built-in heating mechanism (not shown) such as a heater.
- the substrate 7 may be, for example, a semiconductor wafer, which is guided on the guide rail 15 in a state of only the substrate or in a state of being mounted on a tray.
- the substrate transport mechanism 25 is constituted by, for example, a stage rotation mechanism which rotates a circular stage 5 supporting the substrate 7 along a circle whose tangent is the mounting surface. It is also good.
- the stage 5 has a rotation axis 25A extended along the longitudinal parallel direction of the rectangular target 6. By rotating the stage 5 about this rotation axis 25A, the front of the target 6 is taken as the substrate 7 Will pass.
- FIG. 4 is a plan view showing the configuration of the magnet unit of the first embodiment.
- the magnet unit 10 of the present embodiment is provided with a yoke 20 having the same shape (rectangle) as the target 6 and made of a ferromagnetic plate on the back side of the cathode electrode.
- a yoke 20 having the same shape (rectangle) as the target 6 and made of a ferromagnetic plate on the back side of the cathode electrode.
- an annular outer peripheral magnet 30 disposed along the contour of the target 6 and an inner magnet 40 disposed in the outer peripheral magnet and different in polarity from the outer peripheral magnet 30 are provided.
- the main body (first magnetic pole) 31 of the outer peripheral magnet 30 is formed in an annular shape (rectangular frame shape) along the outline of the target 6.
- the internal magnets 40 disposed in the main body (first magnetic pole) 31 of the outer peripheral magnet 30 extend from the central portion thereof to both sides in the longitudinal direction, and n n adjacent to both ends in the longitudinal direction of the outer peripheral magnet 30 And the extended magnetic pole portion 41 of FIG. Specifically, the internal magnet 40 includes n long magnetic pole pieces (third magnetic poles) 42 having the extended magnetic pole portions 41 at both ends. In the present embodiment, two third magnetic poles 42 pass through the longitudinal center portion CL of the outer peripheral magnet 30 and are arranged in parallel along the longitudinal direction of the outer peripheral magnet 30.
- the internal magnet 40 is provided with a coupled magnetic pole piece (fourth magnetic pole) 43 connecting the n long magnetic pole pieces (third magnetic pole) 42.
- a coupled magnetic pole piece (fourth magnetic pole) 43 connecting the n long magnetic pole pieces (third magnetic pole) 42.
- two third magnetic poles 42 are spaced apart, and they are connected by two fourth magnetic poles 43 spaced apart.
- the long magnetic pole piece (third magnetic pole) 42 and the coupling magnetic pole piece (fourth magnetic pole) 43 have the same polarity.
- n-1 protrusions are provided inward in the longitudinal direction so as to be located between the n extending magnetic pole portions 41.
- the magnetic pole portion (second magnetic pole) 32 is protruded.
- one protruding magnetic pole portion (second magnetic pole) 32 is protruded inside the both ends of the outer peripheral magnet 40 .
- the outer peripheral magnet 30 forms a first magnet assembly
- the internal magnet 40 forms a second magnet assembly
- the first magnet assembly and the second magnet assembly mutually The polarity is different.
- FIG. 5 is an explanatory view showing the formation of magnetic lines of force in a general magnet unit.
- FIG. 6 is an explanatory view showing a magnetic track formed by the magnet unit of the first embodiment. In FIG. 5, the top and bottom of the target 6 and the magnet unit 10 are shown in reverse.
- a large number of curved magnetic lines of force (magnetron) M are generated on the front surface of the target 6 by the outer peripheral magnet 30 and the internal magnet 40.
- the tangent of the magnetic field lines M generated on the target forms a magnetic track MT which is a set of regions parallel to the target surface.
- n extending magnetic pole portions 41 are extended at both ends of the internal magnet 40, and are directed inwardly in the longitudinal direction inside the both ends of the outer peripheral magnet 30.
- n-1 projecting magnetic pole portions 32 are projected. Therefore, at both end portions in the longitudinal direction of the magnetic track MT, the n extended magnetic pole portions 41 and the n ⁇ 1 protruding magnetic pole portions 32 form a number of 2n ⁇ 1 folded shapes.
- the magnet unit 10 of the present embodiment since the two extending magnetic pole portions 41 and one projecting magnetic pole portion 32 are alternately arranged at each end, as shown in FIG. The wave-like three folded portions U are formed at both ends in the longitudinal direction.
- the number of the extended magnetic pole portions 41, the protruding magnetic pole portions 32, and the folded portions U in the present embodiment is an example, and the present invention can be grasped by substituting a positive integer of 2 or more for n.
- a positive integer of 2 or more for n For example, when there are three extending magnetic pole portions 41, two protruding magnetic pole portions 32 located between the adjacent extending magnetic pole portions 41 are two, and five folded shape portions U at both end portions in the longitudinal direction of the magnetic track MT. Is formed.
- the number of the extended magnetic pole portions 41 is four, the number of the protruding magnetic pole portions 32 located between the adjacent adjacent extended magnetic pole portions 41 is three, and seven folded shape portions at both ends in the longitudinal direction of the magnetic track MT. U is formed.
- the magnet unit 10 of the first embodiment it is possible to adjust the magnetic track length without changing the target width or the target length. That is, in the present embodiment, since the magnetic pole long piece (third magnetic pole) 42 having the extending magnetic pole parts 41 at both ends is continuous, the protruding magnetic pole parts (second magnetic poles) provided inside the both ends of the outer peripheral magnet 30 The magnetic track lengths at both ends of the target can be extended by appropriately returning the extension length of 32). Further, in the central region of the target 6, two sets of internal magnets 40 are arranged in parallel to the outer peripheral magnet 30, and a strong magnetic field can be generated.
- the magnetic lines of force at both end portions in the longitudinal direction of the magnetic track MT are compensated by the number of folded portions U of 2 n -1, regardless of the magnetic characteristics of the target 6, and without increasing the target length.
- the film thickness distribution of the thin film to be formed can be made uniform.
- the magnet unit 10 of the present embodiment is mounted on the sputtering apparatus 1 capable of transporting the substrate 7 in the direction orthogonal to the longitudinal direction of the target 6, the film thickness reduction of the substrate outer peripheral portion corresponding to the longitudinal direction of the target 6 Can be reduced.
- FIG. 7 is a plan view showing the configuration of the magnet unit of the second embodiment.
- the same components as in the first embodiment will be described with the same reference numerals.
- the yoke 20 and the outer peripheral magnet 30 have the same structure as that of the first embodiment. That is, on the back side of the cathode electrode, a yoke 20 which is the same rectangle as the target 6 and is made of a ferromagnetic plate material is provided. Further, the main body (first magnetic pole) 31 of the outer peripheral magnet 30 is formed in a rectangular frame shape along the outline of the target 6. Further, n-1 projecting magnetic pole portions (second magnetic poles) 32 project inward in the longitudinal direction from both ends inside of the main body (first magnetic pole) 31 of the outer peripheral magnet 30.
- the inner magnet 40 includes a central short magnetic pole piece (fifth magnetic pole) 62 disposed along the longitudinal direction at a central portion in the outer peripheral magnet.
- the central magnetic pole short piece 62 is a single magnetic pole material, but a plurality of central magnetic pole short pieces 62 may be provided in parallel.
- n extending magnetic pole portions (third magnetic poles) 41 are branch-connected through branch magnetic pole pieces (fourth magnetic poles) 63.
- the branch magnetic pole piece (fourth magnetic pole) 63 and the central magnetic pole short piece (fifth magnetic pole) 62 have a U-shape, and the extended magnetic pole parts 41 are arranged in parallel along the longitudinal direction of the outer peripheral magnet 30. ing.
- two branch magnetic pole pieces (fourth magnetic pole) 63 may be arranged in a V-shape.
- the internal magnet 40 includes n extended magnetic pole portions (third magnetic pole) 41 at both ends of the central magnetic pole short piece (fifth magnetic pole) 62 via the branch portion magnetic pole piece (fourth magnetic pole) 63. Between the n third magnetic poles 41, n-1 projecting magnetic pole portions (second magnetic poles) 32 of the external magnet 30 project.
- two third magnetic poles 41 are branched and extended at both ends of one fifth magnetic pole 62 via the fourth magnetic pole 63, and one external magnet 30 is interposed between the third magnetic poles 41.
- the second magnetic pole 32 of the book protrudes.
- the fifth magnetic pole 62, the fourth magnetic pole 63 and the third magnetic pole 41 constituting the internal magnet 40 have the same polarity.
- the outer peripheral magnet 30 forms a first magnet assembly
- the internal magnet 40 forms a second magnet assembly
- the first magnet assembly and the second magnet assembly mutually The polarity is different.
- FIG. 8 is an explanatory view showing the main part of a magnetic track formed by the magnet unit of the second embodiment.
- FIG. 9 is an explanatory view showing a state in which the non-erosion area of the second embodiment is smaller than that of the first embodiment.
- n extending magnetic pole portions 41 are extended at both ends of the internal magnet 40, and inward in the longitudinal direction inside the both ends of the outer peripheral magnet 30 n
- One protruding magnetic pole portion 32 is protruded. Therefore, as shown in FIG. 8, the n extended magnetic pole portions 41 and n ⁇ 1 protruding magnetic pole portions 32 fold back the number of 2 n ⁇ 1 at both end portions in the longitudinal direction of the magnetic track MT. Shaped portion U is formed.
- the wave shape is provided at both ends in the longitudinal direction of the magnetic track MT.
- the three folded portions U are to be formed.
- the number of the extended magnetic pole portions 41, the protruding magnetic pole portions 32, and the folded portions U in the present embodiment is an example, and the present invention can be grasped by substituting a positive integer of 2 or more for n.
- a positive integer of 2 or more for n For example, when there are three extending magnetic pole portions 41, two protruding magnetic pole portions 32 located between the adjacent extending magnetic pole portions 41 are two, and five folded shape portions W are provided at both ends in the longitudinal direction of the magnetic track MT. Is formed.
- the number of the extended magnetic pole portions 41 is four, the number of the protruding magnetic pole portions 32 located between the adjacent adjacent extended magnetic pole portions 41 is three, and seven folded shape portions at both ends in the longitudinal direction of the magnetic track MT. W is formed.
- the magnetic track length can be adjusted without changing the target width or the target length regardless of the magnetic characteristics of the target. That is, in the present embodiment, the extending length D of the extending magnetic pole portions (third magnetic pole) 41 at both end portions of the internal magnet 40 and the protruding magnetic pole portions (second magnetic poles) provided inside the both ends of the outer peripheral magnet 30
- the magnetic track lengths at both ends of the target can be extended by appropriately returning the projection length C of 32. That is, when it is desired to extend the magnetic track length at both ends of the target, it can be coped with by extending the extension length D of the third magnetic pole 41 and the length of the protruding length CD of the second magnetic pole 32. There is no need to change the size.
- the distance between the outer peripheral magnet 30 and the fifth magnetic pole 62 is increased.
- the magnetic track is closer to the center portion of the target short axis compared to the magnet unit 10 of the first embodiment, so the plasma presence region moves near the center portion of the target short axis. , The non-erosion area N becomes smaller.
- the magnet units 10 and 50 of the first and second embodiments it is possible to make the erosion track length at both ends of the target longitudinal longer as compared with the conventional magnet unit. Therefore, according to the magnet units 10 and 50 of the first and second embodiments, the number of sputtered particles from both ends of the target in the longitudinal direction is larger than that in the conventional magnet unit, and the film thickness in the region A is reduced. The deterioration of the film thickness distribution can be suppressed.
- the magnet units 10 and 50 may be swung along the longitudinal direction.
- Example 1 In the first embodiment, a plurality of silicon substrates are supported on a guide rail by using the sputtering apparatus 1 of FIG. 1 and the transport mechanism (guide rail) 15 of FIG. 2, and the guide rail is in a direction orthogonal to the longitudinal direction of the target. The film was moved to form a titanium nitride film on each substrate.
- Titanium (Ti) was used as a target 6 supported by the cathode electrode, and a mixed gas of Ar and N 2 was introduced as a processing gas into the vacuum vessel 2.
- FIG. 10 is an explanatory view showing the film formation situation of Example 1 in relation to the prior art. As shown in FIGS. 10A and 10C, when the conventional magnet unit is mounted on the sputtering apparatus 1, a decrease in film thickness is observed at the substrate outer peripheral portion corresponding to both end portions in the longitudinal direction of the target 6. .
- the magnet unit 10 by using the magnet unit 10 according to the present invention, the magnetic field strength on both sides in the longitudinal direction of the target 6 is increased, and the magnetic field strength in the central part is decreased. Therefore, sputtered particles from both sides in the longitudinal direction of the target 6 increase relatively, and the film thickness distribution deposited on the passing substrate is improved without extending the target length.
- FIG. 11 is an explanatory view showing the dimensional relationship between the target and the substrate.
- P 200 mm
- W 600 mm
- D 130 mm
- T 80 mm.
- Example 2 In the second embodiment, the silicon substrate is supported on the stage 5 using the sputtering apparatus 1 of FIG. 1 and the transport mechanism (rotation mechanism) 25 of FIG. 3, and the substrate 7 is orthogonal to the longitudinal direction of the target 6 by the rotation mechanism 25.
- the tantalum nitride film was formed on each substrate 7.
- Tantalum (Ta) was used as a target 6 supported by the cathode electrode, and a mixed gas of Ar and N 2 was introduced into the vacuum vessel 2 as a processing gas.
- FIG. 12 is an explanatory view showing the film formation situation of Example 2 in relation to the prior art.
- the conventional magnet unit is mounted on the sputtering apparatus 1
- the width of the short-cut portion S of the magnetic track MT is reduced, so that the substrate corresponds to both ends in the longitudinal direction of the target.
- a decrease in film thickness was observed at the outer peripheral portion.
- the magnet unit 50 As described above, by using the magnet unit 50 according to the present invention, the magnetic field strength on both sides in the longitudinal direction of the target 6 is increased, and the magnetic field strength in the central portion is decreased. Therefore, sputtered particles from both sides in the longitudinal direction of the target 6 increase relatively, and the film thickness distribution deposited on the passing substrate is improved without extending the target length.
- the sputtering apparatus of the present invention is not limited to the formation of the nitride film shown in the first and second embodiments, and can be used, for example, in the manufacture of a solar cell.
- the CIS solar cell that has recently been attracting attention will be described as an example.
- FIG. 14 is a schematic cross-sectional view showing the structure of a general CIS solar cell.
- the lower electrode 102 (for example, Mo film) is formed on the substrate 101
- the p-type semiconductor layer 103 (for example Cu (In, Ga) Se 2 ) is formed on the lower electrode 102
- the deposition method It can use for film-forming of the transparent electrode 105 (for example, ITO (Indium Tin Oxide)) on the n-type-semiconductor layer 104 (for example, CdS) formed of etc.
- the transparent electrode 105 for example, ITO (Indium Tin Oxide)
- the n-type-semiconductor layer 104 for example, CdS
- sputtering deposition can be applied to the antireflective film 106 etc., it is possible to use the sputtering apparatus of the present invention.
- by arranging a plurality of magnet units of the present invention in a direction perpendicular to the longitudinal direction and swinging them it becomes possible to form a uniform film on a large substrate.
- the present invention is applicable not only to the illustrated magnetron sputtering apparatus but also to plasma processing apparatuses such as a dry etching apparatus, a plasma asher apparatus, a CVD apparatus, and a liquid crystal display manufacturing apparatus.
- plasma processing apparatuses such as a dry etching apparatus, a plasma asher apparatus, a CVD apparatus, and a liquid crystal display manufacturing apparatus.
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Abstract
Description
真空容器2内には、基板を支持するステージ5と、基板に対向するように配され、ターゲット6を前面側に支持する不図示のカソード電極と、を備えている。
次に、図4を参照して、上記スパッタリング装置1に搭載される第1の実施形態の磁石ユニット10について説明する。図4は、第1の実施形態の磁石ユニットの構成を示す平面図である。
次に、図7を参照して、上記スパッタリング装置1に搭載される第2の実施形態の磁石ユニット50について説明する。図7は、第2の実施形態の磁石ユニットの構成を示す平面図である。なお、第1の実施形態と同一の構成部材については同一の符号を付して説明する。
実施例1では、図1のスパッタリング装置1および図2の搬送機構(ガイドレール)15を用いて、ガイドレール上に複数のシリコン基板を支持し、ガイドレールをターゲットの長手方向と直交する方向に移動させ、各基板上に窒化チタニウム膜を成膜した。
W/P≧2.8
W/D~4.5
W/T≧7
というディメンジョンが一般的である。
2.5≧W/P≧1.7
W/D~4.5
6.3≧W/T≧4.3
というディメンジョン関係でRange/Mean<3%の分布を得ることができた。つまり、両端の磁場強度を高めた効果により、ターゲット幅(W)を減らしランニングコストを低減することが可能になったことを意味する。
実施例2では、図1のスパッタリング装置1および図3の搬送機構(回転機構)25を用いて、ステージ5上にシリコン基板を支持し、回転機構25により基板7をターゲット6の長手方向と直交する方向に移動させ、各基板7上に窒化タンタル膜を成膜した。
2 真空容器
6 ターゲット
7 基板
10、50 磁石ユニット
15、25 搬送機構
20 ヨーク
30 外周磁石
31 本体(第1磁極)
32 突出磁極部(第2磁極)
40 内部磁石
41 延出磁極部(第3磁極)
42 磁極長片(第3磁極)
43 結合磁極片(第4磁極)
62 中央磁極短片(第5磁極)
63 分岐部磁極片(第4磁極)
M 磁力線
MT 磁気トラック
U 折り返し形状部
Claims (4)
- 矩形のターゲットを支持するカソード電極の背面側に、強磁性板材からなるヨークと、該ヨーク上に前記ターゲットの輪郭に沿って配置された環状の外周磁石と、前記ヨーク上の前記外周磁石の内部に配置され、前記外周磁石と極性が異なる内部磁石と、を備え、
前記外周磁石および前記内部磁石によって前記ターゲット上に発生した磁力線の接線が前記ターゲット面と平行になるような領域の集合としての磁気トラックを形成する磁石ユニットであって、
前記内部磁石の中央部から長手方向の両側へ向けて延出され、前記外周磁石の長手方向の両端に近接するn(nは2以上の正の整数)本の延出磁極部と、
前記外周磁石の両端内側から長手方向の内方へ向けて突出され、前記n本の延出磁極部の間に位置するn-1本の突出磁極部と、
を有し、
前記n本の延出磁極部と前記n-1本の突出磁極部とが前記磁気トラックの長手方向の両端部に2n-1の数の折り返し形状部を形成することを特徴とするマグネトロンスパッタリング装置の磁石ユニット。 - 前記内部磁石は、前記延出磁極部を両端に有し、前記外周磁石の長手方向中心部を通り、該長手方向に沿って平行に配置されたn本の磁極長片と、これらn本の磁極長片を接続する結合磁極片と、を備え、前記n本の磁極長片および前記結合磁極片は同一極性を有す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リング装置の磁石ユニット。
- 前記内部磁石は、前記外周磁石内の中央部にその長手方向に沿って配置された中央磁極短片と、該中央磁極短片の両端部に分岐接続され、前記外周磁石の長手方向に沿って平行に配置された前記n本の延出磁極部と、を備え、前記中央磁極短片および前記n本の延出磁極部は同一極性を有す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リング装置の磁石ユニット。
- 真空排気可能な処理室に、
処理対象としての基板と、
前記基板に対向するように配され、放電用電力が供給されるカソード電極と、
前記カソード電極の前面側に支持されたターゲットと、
前記ターゲットの前方に前記基板を通過させる搬送機構と、
を備え、
前記カソード電極の背面側に、請求項1から3のいずれかに記載の磁石ユニットが配されていることを特徴とするマグネトロンスパッタリング装置。
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