WO2018186038A1 - 成膜装置及び成膜方法 - Google Patents
成膜装置及び成膜方法 Download PDFInfo
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- WO2018186038A1 WO2018186038A1 PCT/JP2018/006024 JP2018006024W WO2018186038A1 WO 2018186038 A1 WO2018186038 A1 WO 2018186038A1 JP 2018006024 W JP2018006024 W JP 2018006024W WO 2018186038 A1 WO2018186038 A1 WO 2018186038A1
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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
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/08—Oxides
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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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/54—Controlling or regulating the coating process
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- 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
- H01J37/3464—Operating strategies
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
Definitions
- the present invention relates to a film forming apparatus and a film forming method.
- Transparent conductive layers such as ITO (Indium Tin Oxide) layers are used in electronic devices such as displays, solar cells, and touch panels (see, for example, Patent Document 1).
- a method for forming a transparent conductive layer there are a chemical production method represented by a CVD (Chemical Vapor Deposition) method and a physical production method represented by a sputtering method.
- the CVD method may be difficult to apply to a substrate having low heat resistance, for example, and it may take time to process the exhaust gas.
- the sputtering method can be applied to a substrate having low heat resistance, and its composition can be optimally adjusted by introducing oxygen into the vacuum vessel. Further, the sputtering method can be applied to a large substrate. For this reason, when a transparent conductive layer is provided on the electronic device, a sputtering method is often employed. And in a transparent conductive layer, the change of a composition may be calculated
- the composition of the target material is fixed. For this reason, the composition of the layer formed on the substrate cannot be easily changed. In order to change the composition of this layer, it is necessary to separately prepare target materials corresponding to the respective layer compositions.
- an object of the present invention is to provide a film forming apparatus and a film forming method capable of easily changing the composition of a layer when a layer is formed on a substrate by a sputtering method. It is in.
- a film forming apparatus includes a vacuum vessel, a substrate transport mechanism, a film forming source, and a control unit.
- the vacuum container can maintain a reduced pressure state.
- the substrate transport mechanism can transport the substrate within the vacuum container.
- the film-forming source has a first target and a second target that face the substrate and are arranged along the transport direction of the substrate.
- the material of the first target is different from the material of the second target.
- Plasma is generated by applying an AC voltage having a long waveband between the first target and the second target, and the material of the first target and the material of the second target are formed on the substrate. It is possible to form a mixed layer.
- the control unit can change the duty ratio of the AC voltage.
- it is such a film-forming apparatus, it is an alternating voltage applied between the first target and the second target, and the frequency is changed by changing the duty ratio of the alternating voltage in the long wave band.
- the mixing ratio of the first target material and the second target material in the layer can be easily changed.
- the resistivity of the first target may be different from the resistivity of the second target.
- the mixing ratio of the first target and the second target having different resistivity can be easily changed in the layer.
- the sputtering rate of the first target may be different from the sputtering rate of the second target.
- the first target and the second target are changed by changing the duty ratio even if the sputtering rates of the first target and the second target are different in the layer.
- a layer including evenly can be formed.
- the frequency may be 10 kHz or more and 100 kHz or less.
- the AC voltage in the frequency band of 10 kHz to 100 kHz is applied between the first target and the second target, whereby the material of the first target in the layer is formed.
- the mixing ratio of the second target material can be appropriately changed.
- each of the first target and the second target may be formed in a cylindrical shape, and each central axis of the first target and the second target is transport of the substrate.
- Each of the first target and the second target may be configured to be rotatable about the central axis.
- the film forming source further includes a first magnetic circuit disposed inside the first target and a second magnetic circuit disposed inside the second target. Also good.
- the direction in which the first magnetic circuit faces the first target and the direction in which the second magnetic circuit faces the second target may be variable.
- a film forming method is configured to cause a first target and a second target made of a material different from the first target to face the substrate, and in the transport direction of the substrate. And arranging the first target and the second target along. While transporting the substrate in the transport direction in a reduced-pressure atmosphere, an alternating voltage is applied between the first target and the second target and the frequency is a long wave band and the duty ratio can be changed. Plasma is generated between the first target and the second target. A layer in which the material of the first target and the material of the second target are mixed is formed on the substrate.
- the AC voltage applied between the first target and the second target, and the frequency is changed by changing the duty ratio of the AC voltage in the long wave band.
- the mixing ratio of the first target material and the second target material in the layer can be freely changed. Thereby, the composition of the layer formed on the substrate can be easily changed.
- the resistivity of the first target may be different from the resistivity of the second target.
- the mixing ratio of the first target and the second target having different resistivity can be easily changed in the layer.
- the sputtering rate of the first target may be different from the sputtering rate of the second target.
- the first target and the second target are changed by changing the duty ratio even if the sputtering rates of the first target and the second target are different in the layer.
- a layer including evenly can be formed.
- the frequency may be 10 kHz or more and 100 kHz or less.
- the AC voltage in the frequency band of 10 kHz or more and 100 kHz or less is applied between the first target and the second target, whereby the material of the first target in the layer is formed. And the mixing ratio of the second target material can be appropriately changed.
- each of the first target and the second target is formed in a cylindrical shape, and each central axis of the first target and the second target intersects with the transport direction of the substrate.
- the plasma may be generated between the first target and the second target while rotating each of the first target and the second target about the central axis.
- a first magnetic circuit is arranged inside the first target
- a second magnetic circuit is arranged inside the second target
- the first magnetic circuit faces the first target.
- the plasma may be generated between the first target and the second target by changing a direction in which the second magnetic circuit faces the second target.
- the AC voltage may be applied to the target having a low sputtering rate for a longer time.
- a layer in which the materials of the first target and the second target are uniformly mixed can be formed on the substrate.
- a film forming apparatus and a film forming method capable of easily changing the composition of a layer formed on a substrate by a sputtering method are provided.
- FIG. 1 is a schematic cross-sectional view of a film forming apparatus according to a first embodiment. It is a top view which shows arrangement
- FIG. (A) is a schematic cross-sectional view showing the operation of the film forming apparatus according to the first embodiment, and FIGS. (B) and (c) are rectangular wave alternating currents applied to the first target and the second target. It is the schematic which shows the time change of a voltage. It is a graph which shows the relationship between the duty ratio of a rectangular wave alternating voltage, and the sheet resistance of a layer.
- FIG. 1 is a schematic cross-sectional view of a film forming apparatus according to the first embodiment.
- FIG. 2 is a top view showing the arrangement of the target and the substrate of the film forming apparatus according to the first embodiment.
- 1 and 2 includes a vacuum vessel 10, a substrate transport mechanism 20, a film forming source 30, an AC power source 50, a control unit 60, and a gas supply source 70.
- the vacuum vessel 10 is a vessel capable of maintaining a reduced pressure state.
- the gas in the vacuum vessel 10 is exhausted to the outside through an exhaust port 10d by an exhaust mechanism such as a turbo molecular pump.
- the film forming apparatus 101 may be a batch type film forming apparatus or a continuous type film forming apparatus.
- the vacuum container 10 functions as one processing chamber in the film forming apparatus 101.
- the vacuum container 10 is provided with a substrate carry-in portion 10a and a substrate carry-out portion 10b. Then, when the substrate 21A is carried into the vacuum vessel 10 from the substrate carry-in portion 10a, the substrate 21A is subjected to processing such as sputtering film formation in the vacuum vessel 10, and thereafter, the substrate 21A is evacuated through the substrate carry-out portion 10b. It is carried out of the container 10.
- the substrate 21A includes, for example, a glass substrate having a rectangular planar shape. In the example of FIG. 1, the surface of the substrate 21A facing the film formation source 30 is a film formation surface 21d.
- the substrate transport mechanism 20 can transport the substrate 21 ⁇ / b> A in the vacuum container 10.
- the substrate transport mechanism 20 includes a roller rotation mechanism 20r and a frame portion 20f.
- the roller rotation mechanism 20r is supported by the frame portion 20f.
- the roller rotation mechanism 20r rotates, so that the substrate holder 22 supporting the substrate 21A and the substrate 21A is transferred from the substrate carry-in portion 10a to the substrate. It is slid and transferred toward the carry-out part 10b.
- the film formation source 30 includes a first film formation source 31 and a second film formation source 32.
- the first film formation source 31 includes a first target 31T, a first backing tube 31B, and a first magnetic circuit 31M.
- the second film formation source 32 includes a second target 32T, a second backing tube 32B, and a second magnetic circuit 32M.
- the film forming apparatus 101 is a film forming apparatus having a so-called dual target.
- the first target 31T is supported by the first backing tube 31B.
- the first magnetic circuit 31M is disposed in the first target 31T and is disposed in the first backing tube 31B.
- the second target 32T is supported by the second backing tube 32B.
- the second magnetic circuit 32M is disposed in the second target 32T and is disposed in the second backing tube 32B.
- a flow path (not shown) through which a cooling medium flows may be provided inside each of the first backing tube 31B and the second backing tube 32B.
- the first target 31T and the second target 32T face the substrate 21A.
- the first target 31T and the second target 32T are arranged along the transport direction (Y-axis direction) of the substrate 21A.
- the central axis 31c of the first target 31T is parallel to the longitudinal direction of the first target 31T.
- the central axis 32c of the second target 32T is parallel to the longitudinal direction of the second target 32T.
- Each of the first target 31T, the first backing tube 31B, the second target 32T, and the second backing tube 32B has a cylindrical shape.
- each of the first target 31T, the first backing tube 31B, the second target 32T, and the second backing tube 32B is not limited to a cylindrical type, and may be a disk type.
- the central axis 31c of the first target 31T intersects the transport direction of the substrate 21A.
- the center axis 32c of the second target 32T intersects the transport direction of the substrate 21A.
- each of the central axes 31c and 32c is orthogonal to the Y-axis direction and extends in the X-axis direction.
- the first target 31T is configured to be rotatable about the central axis 31c.
- the second target 32T is configured to be rotatable about the central axis 32c. That is, the first target 31T and the second target 32T are so-called rotary targets.
- the material of the first target 31T is different from the material of the second target 32T.
- the resistivity of the first target 31T is different from the resistivity of the second target 32T.
- the sputtering rate of the first target 31T is different from the sputtering rate of the second target 32T.
- An adhesion preventing plate 11 is provided between the substrate transport mechanism 20 and the film forming source 30.
- the material of the first target 31T includes at least one of niobium oxide, tantalum oxide, titanium oxide, and molybdenum oxide.
- the material of the second target 32T includes at least one of ITO (indium tin oxide (tin oxide content: 1 wt% to 15 wt%)), indium oxide, tin oxide, zinc oxide, and gallium oxide.
- ITO indium tin oxide (tin oxide content: 1 wt% to 15 wt%)
- ITO indium tin oxide (tin oxide content: 1 wt% to 15 wt%)
- indium oxide, tin oxide, zinc oxide, and gallium oxide is an example and is not limited to this value.
- the direction D2 facing the second target 32T is variable.
- the first magnetic circuit 31M is configured to be rotatable about the central axis 31c
- the second magnetic circuit 32M is configured to be rotatable about the central axis 32c.
- the position of magnetic lines of force (magnetic field formed along the surface of the first target 31T) leaking from the magnetic circuit 31M to the surface of the first target 31T is configured to be variable.
- the position of magnetic lines of force (magnetic field formed along the surface of the second target 32T) leaking from the magnetic circuit 32M to the surface of the second target 32T is configured to be variable.
- the frequency of the AC voltage is a long wave (LF) band.
- the long wave band according to the present embodiment includes a super long wave band.
- the frequency of the AC voltage is more preferably 10 kHz or more and 100 kHz or less.
- the sputtered particles emitted from the first target 31T and the second target 32T reach the film formation surface 21d of the substrate 21A. Thereby, a layer in which the sputtered particles S1 sputtered from the first target 31T and the sputtered particles S2 sputtered from the second target 32T are mixed is formed on the film formation surface 21d.
- the AC power supply 50 supplies an AC voltage between the first target 31T and the second target 32T.
- the AC voltage supplied from the AC power supply 50 is, for example, a rectangular wave AC voltage.
- This rectangular wave AC voltage is not limited to an ideal rectangular wave AC voltage, for example.
- the rising edge or falling edge of the pulse may not be perpendicular to the time axis.
- the control unit 60 can modulate the duty ratio of the rectangular AC voltage. For example, the control unit 60 sets the length of the pulse voltage (minus voltage) applied to the first target 31T to be shorter than the length of the pulse voltage (minus voltage) applied to the second target 32T, The length of the pulse voltage (minus voltage) applied to 31T can be set longer than the length of the pulse voltage (minus voltage) applied to the second target 32T.
- the gas supply source 70 includes a flow rate regulator 71 and a gas nozzle 72.
- a discharge gas is supplied into the vacuum vessel 10 by the gas supply source 70.
- the discharge gas is, for example, a rare gas such as argon or helium, oxygen, or the like. The operation of the film forming apparatus 101 will be described below.
- FIG. 3 is a schematic flow of the film forming method according to the first embodiment.
- the first target 31T and the second target 32T are opposed to the substrate 21A, and the first target 31T and the second target 32T are disposed along the transport direction of the substrate 21A. (S10).
- FIG. 4A is a schematic cross-sectional view showing the operation of the film forming apparatus according to the first embodiment, and FIGS. 4B and 4C are rectangles applied to the first target and the second target. It is the schematic which shows the time change of a wave alternating voltage.
- the horizontal axis is time
- the vertical axis is voltage. 4A, the vacuum container 10, the substrate transport mechanism 20, the AC power supply 50, the control unit 60, the gas supply source 70, and the like illustrated in FIG. 1 are omitted.
- the discharge gas When a discharge gas is introduced into the vacuum vessel 10 and an AC voltage is applied between the first target 31T and the second target 32T, the discharge gas is ionized between the first target 31T and the second target 32T. . During discharge, the first target 31T and the second target 32T rotate in the direction of the arrow.
- a rectangular wave AC voltage is applied between the first target 31T and the second target 32T. Therefore, when the + Vs voltage is applied to the first target 31T, the ⁇ Vs voltage is applied to the second target 32T, and when the ⁇ Vs voltage is applied to the first target 31T, the + Vs voltage is applied to the second target 32T.
- a voltage is applied (FIG. 4B).
- “t” in FIGS. 4B and 4C is a voltage cycle of the rectangular wave AC voltage.
- T1 is a time during which ⁇ Vs is applied to the first target 31T.
- T2 is a time during which ⁇ Vs is applied to the second target 32T.
- a voltage of + Vs ⁇ 2 is applied between the first target 31T and the second target 32T.
- the film formation source 30 when the -Vs voltage is applied to the first target 31T, the first target 31T is sputtered by cations in the discharge gas, and the sputtered particles S1 are emitted from the first target 31T.
- the ⁇ Vs voltage when the ⁇ Vs voltage is applied to the second target 32T, the second target 32T is sputtered by the cations in the discharge gas, and the sputtered particles S2 are emitted from the second target 32T.
- the direction D1 of the magnetic circuit 31M is tilted in the Y-axis direction, deviating from the Z-axis direction.
- the plasma is easily captured between the Z-axis direction and the Y-axis direction, and the plasma density is increased between the Z-axis direction and the Y-axis direction. Therefore, from the first target 31T, the sputtered particles S1 are mainly emitted from between the Z-axis direction and the Y-axis direction, and the sputtered particles S1 fly toward the substrate 21A.
- the direction D2 of the magnetic circuit 32M is tilted in the direction opposite to the Y-axis direction ( ⁇ Y-axis direction) with respect to the Z-axis direction.
- the plasma is easily captured between the Z-axis direction and the ⁇ Y-axis direction, and the plasma density increases between the Z-axis direction and the ⁇ Y-axis direction. Therefore, from the second target 32T, the sputtered particles S2 are emitted mainly from between the Z-axis direction and the ⁇ Y-axis direction, and the sputtered particles S2 fly toward the substrate 21A.
- the sputtered particles S1 emitted from the first target 31T and the sputtered particles S2 emitted from the second target 32T are mixed under the film formation surface 21d, and the film formation surface 21d has the first target 31T of the first target 31T.
- a layer in which the material and the material of the second target 32T are mixed is formed.
- the time during which the ⁇ Vs voltage is applied to the first target 31T is longer than the time during which the ⁇ Vs voltage is applied to the second target 32T. .
- the amount of sputtered particles emitted from the first target 31T is larger than the amount of sputtered particles emitted from the second target 32T.
- a layer in which the material of the first target 31T is richer than the material of the second target 32T is formed on the film formation surface 21d.
- the sputtering rate of the first target 31T and the sputtering rate of the second target 32T are substantially the same.
- the time during which the ⁇ Vs voltage is applied to the second target 32T is longer than the time during which the ⁇ Vs voltage is applied to the first target 31T.
- the amount of sputtered particles emitted from the second target 32T is larger than the amount of sputtered particles emitted from the first target 31T.
- a layer in which the material of the second target 32T is richer than the material of the first target 31T is formed on the film formation surface 21d.
- a rectangular wave AC voltage is applied between the first target 31T and the second target 32T, and the duty ratio (t1 / t or t2 / t) of the rectangular wave AC voltage is applied.
- the duty ratio (t1 / t or t2 / t) of the rectangular wave AC voltage is applied.
- the composition of the layer formed on the substrate 21A can be easily changed using two targets made of different materials.
- a discharge is caused between the film forming source 30 and the grounding part (vacuum container 10, deposition preventing plate 11, substrate transport mechanism 20 and the like) of the film forming apparatus 101 to form a film.
- a film is formed by causing a discharge between the first target 31T and the second target 32T.
- Some sputtering apparatuses apply a direct current (DC) voltage or a radio frequency (RF) voltage to a target to discharge plasma between the target and a ground portion to form a layer on the substrate. Some of these sputtering apparatuses have a plurality of targets.
- DC direct current
- RF radio frequency
- the layer is formed not only on the substrate but also on the ground portion. Therefore, when the target material is a high-resistance material such as an insulator, if the high-resistance layer continues to be deposited on the ground portion, the ground portion is covered with a thick high-resistance layer, and stable between the target and the ground portion. Plasma discharge may not be maintained. For this reason, in a sputtering apparatus that discharges plasma between the target and the ground portion, maintenance work is required to periodically release the vacuum and remove the high resistance material from the ground portion.
- a high-resistance material such as an insulator
- the film forming apparatus 101 In contrast, in the film forming apparatus 101 according to the present embodiment, plasma discharge is generated between the first target 31T and the second target 32T. For this reason, even if the high resistance material continues to be deposited on the anode portion, the plasma discharge in the film forming apparatus 101 lasts for a long time. That is, the film forming apparatus 101 is excellent in mass productivity.
- the frequency band of the rectangular wave AC voltage is a long wave band, and more preferably set to 10 kHz or more and 100 kHz or less. Thereby, the composition of the layer formed on the substrate 21A can be appropriately changed.
- the sputtering time of each of the first target 31T and the second target 32T becomes longer, and the material layer of the first target 31T and the second target 32T are formed on the substrate 21A. It is easy to form a layer in which these material layers are alternately stacked.
- the frequency of the rectangular wave AC voltage is greater than 100 kHz, the period t becomes too short, and the resolution of the duty ratio decreases. Thereby, during film formation, a sufficient voltage is not applied to either the first target 31T or the second target 32T, and one of the materials of the first target 31T and the second target 32T is in the layer. It becomes difficult to be mixed.
- each of the first target 31T and the second target 32T is a rotary target, and film formation is performed while the substrate 21A is transferred in the direction in which the two rotary targets are arranged (Y-axis direction). .
- the mixing ratio of the material of the first target 32T and the material of the second target 32T in the in-plane direction of the substrate 21A becomes uniform.
- the film forming apparatus 101 when the sputtering rates of the first target 31T and the second target 32T are different from each other, by applying a ⁇ Vs voltage to a target having a low sputtering rate for a longer time, A layer in which each of the material and the material of the second target 32T is uniformly mixed can be formed on the substrate 21A.
- FIG. 5 is a graph showing the relationship between the duty ratio of the rectangular AC voltage and the sheet resistance of the layer.
- First target 31T Niobium oxide target
- Second target 32T ITO target (tin oxide 5 wt%)
- Electric power 1kW / m (equivalent to one target)
- Deposition pressure 0.4 Pa
- Frequency 20kHz
- Deposition layer thickness 10 nm
- Deposition temperature room temperature
- the horizontal axis in FIG. 5 is the duty ratio (%). As for the duty ratio, t2 / t is expressed as a percentage.
- the vertical axis in FIG. 5 is the sheet resistance ( ⁇ / sq.) Of the layer.
- the resistivity of niobium oxide is higher than the resistivity of the ITO target (tin oxide 5 wt%).
- the sheet resistance of the film formation layer decreases. That is, the result of FIG. 5 is that the ratio of the material of the first target 31T and the material of the second target 32T in the film formation layer is changed by adjusting t2 / t (%), and the sheet of the film formation layer is changed. It shows that the resistance can be adjusted easily.
- FIG. 6 is a schematic cross-sectional view showing another operation of the film forming apparatus according to the first embodiment.
- the first magnetic circuit 31M is configured to be rotatable about the central axis 31c.
- the second magnetic circuit 32M is configured to be rotatable about the central axis 32c.
- the magnet 32mg of the second magnetic circuit 32M is opposed to the first target 31T.
- the discharge gas is ionized between the first target 31T and the second target 32T.
- the magnet 32mg of the second magnetic circuit 32M faces the first target 31T. For this reason, in the vicinity of the surface of the second target 32T, the plasma is easily captured at a position where the first target 31T faces the second target 32T. Thereby, the sputtered particles S2 are emitted from the second target 32T toward the first target 31T.
- the material of the second target 32T attached to the first target 31T is sputtered together with the material of the first target 31T.
- the sputtered particles S1 and S2 containing the material of the first target 31T and the material of the second target 32T fly toward the substrate 21A.
- a layer in which the material of the first target 31T and the material of the second target 32T are mixed is formed on the substrate 21A.
- an oxide MO y of a certain metal M is difficult to be a sintered body. Such an oxide MO y is unlikely to be a target material. Thus, for an oxide MO y, by a sputtering method, can be mixed in the layer becomes difficult.
- a target of oxide A is used as the first target 31T, and a target of metal M is used as the second target 32T. Further, oxygen is added to the discharge gas.
- the metal M sputtered particles are released from the second target 32T, and the metal M sputtered particles adhere to the surface of the first target 31T.
- the metal M attached to the first target 31T is sputtered together with the oxide A of the first target 31T.
- the sputtered particles including the oxide A and the metal M are released from the first target 31T, and these sputtered particles fly toward the substrate 21A.
- oxygen is added to the discharge gas as an assist gas.
- the sputtered particles of the metal M become oxide particles (MO y ), and eventually a layer in which the oxide A and the oxide MO y are mixed is formed on the substrate 21A.
- the sputtered particles of the metal M are not directly emitted toward the substrate 21 ⁇ / b> A, but the metal M is once attached to the first target 31 ⁇ / b> T, and then further emitted toward the substrate 21 ⁇ / b> A. To do. For this reason, the path
- the composition in the thickness direction of the layer formed on the film formation surface 21d becomes more difficult to vary.
- the substrate and the substrate transport mechanism for transporting the substrate are not limited to the above-described configuration, and may be configured as follows, for example.
- FIG. 7 is a schematic cross-sectional view of a film forming apparatus according to the second embodiment.
- the vacuum container 10, the substrate transport mechanism 20, the AC power supply 50, the control unit 60, the gas supply source 70, and the like illustrated in FIG. 1 are omitted.
- the film forming apparatus 102 is a winding film forming apparatus.
- a long flexible substrate 21B cut to a predetermined width is used as a substrate.
- the flexible substrate 21B is, for example, a polyimide film.
- the film forming apparatus 102 includes a substrate transport mechanism 23.
- the substrate transport mechanism 23 includes a main roller 23A, a guide roller 23B, and a guide roller 23C.
- the transport mechanism 23 is a film traveling mechanism.
- the main roller 23 ⁇ / b> A faces the film forming source 30.
- a flexible substrate 21B is disposed between the main roller 23A and the film forming source 30.
- the back surface of the flexible substrate 21B (the surface opposite to the film forming surface 21d) is in contact with the roller surface of the main roller 23A.
- the film formation surface 21 d of the flexible substrate 21 ⁇ / b> B faces the film formation source 30. Then, the flexible substrate 21B continuously travels in the direction of the arrow G by the rotation of the main roller 23A, the guide roller 23B, and the guide roller 23C.
- the sputtered particles S1 are emitted from the first target 31T, and the sputtered particles S2 are emitted from the second target 32T. Is released.
- a layer in which the material of the first target 31T and the material of the second target 32T are mixed is formed on the film formation surface 21d of the flexible substrate 21B. It is formed.
- the same action as the film forming apparatus 101 is performed.
- FIG. 8 is a schematic cross-sectional view of a film forming apparatus according to the third embodiment.
- the vacuum container 10, the substrate transport mechanism 20, the AC power supply 50, the control unit 60, the gas supply source 70, and the like illustrated in FIG. 1 are omitted.
- a substrate 21C that is smaller than the substrate 21A is used as the substrate.
- the planar shape of the substrate 21C is rectangular or circular.
- the substrate 21C is, for example, a glass substrate or a semiconductor substrate.
- the upper and lower positions of the film forming source 30 and the substrate transport mechanism 24 may be reversed.
- the Z-axis direction may be a direction perpendicular to the ground
- the X-axis direction may be a direction perpendicular to the ground.
- the film forming apparatus 103 includes a substrate rotation type transport mechanism.
- the substrate transport mechanism 24 is a rotary stage that rotates about a central axis 24c.
- the substrate transport mechanism 24 faces the film forming source 30.
- the substrate transport mechanism 24 supports the plurality of substrates 21C on the outer periphery.
- a plurality of substrates 21C may be arranged in the X-axis direction.
- the plurality of substrates 21 ⁇ / b> C rotate in the rotation direction R by the rotation of the substrate transport mechanism 24.
- the first target 31T and the second target 32T are arranged.
- the center axis 24c of the substrate transport mechanism 24, the center axis 31c of the first target 31T, and the center axis 32c of the second target 32T are parallel to each other.
- the film forming apparatus 103 when a rectangular wave AC voltage is applied between the first target 31T and the second target 32T, the sputtered particles S1 are emitted from the first target 31T, and the sputtered particles S2 are emitted from the second target 32T. Is released. Thereby, a layer in which the material of the first target 31T and the material of the second target 32T are mixed is formed on the film forming surface 21d of the substrate 21C while the substrate 21C is rotated by the substrate transport mechanism 24.
- FIG. 9 is a schematic top view of the film forming apparatus according to the fourth embodiment. 9, the vacuum container 10, the substrate transport mechanism 20, the AC power supply 50, the control unit 60, the gas supply source 70, and the like illustrated in FIG. 1 are omitted. In the film forming apparatus 104, the upper and lower positions of the film forming source 30 and the substrate transport mechanism 25 may be reversed.
- the film forming apparatus 104 includes a substrate rotation type transport mechanism.
- the substrate transport mechanism 25 is a rotary stage that rotates about a central axis 25c.
- the substrate transport mechanism 25 faces the film forming source 30.
- the substrate transport mechanism 25 supports a plurality of substrates 21C on the upper surface side.
- a plurality of substrates 21C may be arranged in the X-axis direction. In the example of FIG. 9, a plurality of substrates 21C are arranged radially.
- the plurality of substrates 21 ⁇ / b> C rotate in the rotation direction R by the rotation of the substrate transport mechanism 25.
- the first target 31T and the second target 32T are arranged.
- the central axis 25c of the substrate transport mechanism 25 is orthogonal to the central axis 31c of the first target 31T and the central axis 32c of the second target 32T.
- the film forming apparatus 104 when a rectangular wave AC voltage is applied between the first target 31T and the second target 32T, the sputtered particles S1 are emitted from the first target 31T, and the sputtered particles S2 are emitted from the second target 32T. Is released. Thereby, a layer in which the material of the first target 31T and the material of the second target 32T are mixed is formed on the film forming surface 21d of the substrate 21C while the substrate 21C is rotated by the substrate transport mechanism 25.
- the same action as the film forming apparatus 101 is performed.
- Second magnetic circuit 32 mg ... Magnet 50 ... AC power supply 60 ... Control unit 70 ... Gas supply source 71 ... Flow rate regulator 72 ... Gas nozzle 101 , 102, 103, 104 ... film forming apparatus S1, S2 ... sputtered particles
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Abstract
Description
このような成膜装置であれば、上記第1ターゲットと上記第2ターゲットとの間に印加される交流電圧であって、周波数が長波帯域の上記交流電圧の上記デューティー比を変えることによって、上記層における上記第1ターゲットの材料と上記第2ターゲットの材料との混合比を簡便に変えることできる。
このような成膜装置であれば、上記層において、抵抗率が異なる上記第1ターゲットと上記第2ターゲットとの混合比を簡便に変えることできる。
このような成膜装置であれば、上記層において、上記第1ターゲット及び上記第2ターゲットのそれぞれのスパッタリング率が異なっても上記デューティー比を変えることにより、上記第1ターゲット及び上記第2ターゲットを満遍なく含む層を形成することができる。
このような成膜装置であれば、10kHz以上100kHz以下の周波数帯域の上記交流電圧が上記第1ターゲットと上記第2ターゲットとの間に印加されることよって、上記層における上記第1ターゲットの材料と上記第2ターゲットの材料との混合比を適格に変えることできる。
このような成膜装置であれば、上記基板が大型であっても、上記基板の面内方向における、上記第1ターゲットの材料と上記第2ターゲットの材料との混合比がより均一になる。
このような成膜装置であれば、上記磁気回路によって、それぞれの上記ターゲット近傍に補足されるプラズマの位置が可変になり、それぞれの上記ターゲットから放出されるスパッタ粒子の向きを変えることができる。
このような成膜方法であれば、上記第1ターゲットと上記第2ターゲットとの間に印加される交流電圧であって、周波数が長波帯域の上記交流電圧の上記デューティー比を変えることによって、上記層における上記第1ターゲットの材料と上記第2ターゲットの材料との混合比を自在に変えることできる。これにより、上記基板上に形成される上記層の組成を簡便に変更することが可能になる。
このような成膜方法であれば、上記層において、抵抗率が異なる上記第1ターゲットと上記第2ターゲットとの混合比を簡便に変えることできる。
このような成膜方法であれば、上記層において、上記第1ターゲット及び上記第2ターゲットのそれぞれのスパッタリング率が異なっても上記デューティー比を変えることにより、上記第1ターゲット及び上記第2ターゲットを満遍なく含む層を形成することができる。
このような成膜方法であれば、10kHz以上100kHz以下の周波数帯域の上記交流電圧が上記第1ターゲットと上記第2ターゲットとの間に印加されることよって、上記層における上記第1ターゲットの材料と上記第2ターゲットの材料との混合比を適格に変えることできる。
このような成膜方法であれば、上記基板が大型であっても、上記基板の面内方向における、上記第1ターゲットの材料と上記第2ターゲットの材料との混合比がより均一になる。
このような成膜方法であれば、上記磁気回路によって、それぞれの上記ターゲット近傍に補足されるプラズマの位置が可変になり、それぞれの上記ターゲットから放出されるスパッタ粒子の向きを変えることができる。
このような成膜方法であれば、第1ターゲットの材料及び第2ターゲットの材料のそれぞれが万遍なく混合した層を基板上に形成することができる。
図2は、第1実施形態に係る成膜装置のターゲットと基板との配置を示す上面図である。
第1ターゲット31T:酸化ニオブターゲット
第2ターゲット32T:ITOターゲット(酸化スズ5wt%)
電力:1kW/m(ターゲット1個相当)
成膜圧力:0.4Pa
周波数:20kHz
成膜層の厚さ:10nm
成膜温度:室温
[第4実施形態]
10a…基板搬入部
10b…基板搬出部
10d…排気口
11…防着板
20、23、24、25…基板搬送機構
20f…フレーム部
20r…ローラ回転機構
21A、21B、21C…基板
21d…成膜面
22…基板ホルダ
24c、25c、31c、32c…中心軸
30…成膜源
31…第1成膜源
31T…第1ターゲット
31B…第1バッキングチューブ
31M…第1磁気回路
31mg…磁石
32…第2成膜源
32T…第2ターゲット
32B…第2バッキングチューブ
32M…第2磁気回路
32mg…磁石
50…交流電源
60…制御部
70…ガス供給源
71…流量調整器
72…ガスノズル
101、102、103、104…成膜装置
S1、S2…スパッタリング粒子
Claims (13)
- 減圧状態を維持することが可能な真空容器と、
前記真空容器内で基板を搬送することが可能な基板搬送機構と、
前記基板に対向し前記基板の搬送方向に沿って配置された第1ターゲットと第2ターゲットとを有し、前記第1ターゲットの材料が前記第2ターゲットの材料と異なり、前記第1ターゲットと前記第2ターゲットとの間に周波数が長波帯域の交流電圧が印加されることによりプラズマを発生させ、前記基板に前記第1ターゲットの前記材料と前記第2ターゲットの前記材料とが混合した層を形成することが可能な成膜源と、
前記交流電圧のデューティー比を変えることが可能な制御部と
を具備する成膜装置。 - 請求項1に記載の成膜装置であって、
前記第1ターゲットの抵抗率は、前記第2ターゲットの抵抗率と異なる
成膜装置。 - 請求項1に記載の成膜装置であって、
前記第1ターゲットのスパッタリング率は、前記第2ターゲットのスパッタリング率とは異なる
成膜装置。 - 請求項1~3のいずれか1つに記載の成膜装置であって、
前記周波数は、10kHz以上100kHz以下である
成膜装置。 - 請求項1~4のいずれか1つに記載の成膜装置であって、
前記第1ターゲット及び前記第2ターゲットのそれぞれは、円筒型に構成され、
前記第1ターゲット及び前記第2ターゲットのそれぞれの中心軸は、前記基板の搬送方向に対して交差し、
前記第1ターゲット及び前記第2ターゲットのそれぞれは、それぞれの前記中心軸を軸に回転可能に構成されている
成膜装置。 - 請求項1~5のいずれか1つに記載の成膜装置であって、
前記成膜源は、前記第1ターゲットの内部に配置される第1磁気回路と、前記第2ターゲットの内部に配置される第2磁気回路とをさらに有し、
前記第1磁気回路が前記第1ターゲットに対向する向き及び前記第2磁気回路が前記第2ターゲットに対向する向きが可変となるように構成されている
成膜装置。 - 第1ターゲットと、前記第1ターゲットとは材料が異なる第2ターゲットとを基板に対向させるとともに、前記基板の搬送方向に沿って前記第1ターゲットと前記第2ターゲットとを配置し、
減圧雰囲気で前記搬送方向に前記基板を搬送しつつ、前記第1ターゲットと前記第2ターゲットとの間に、周波数が長波帯域であって、デューティー比を変えることが可能な交流電圧を印加することによって前記第1ターゲットと前記第2ターゲットとの間にプラズマを発生させ、
前記基板に前記第1ターゲットの材料と前記第2ターゲットの材料とが混合した層を形成する
成膜方法。 - 請求項7に記載の成膜方法であって、
前記第1ターゲットの抵抗率は、前記第2ターゲットの抵抗率と異なる
成膜方法。 - 請求項7に記載の成膜方法であって、
前記第1ターゲットのスパッタリング率は、前記第2ターゲットのスパッタリング率とは異なる
成膜方法。 - 請求項7~9のいずれか1つに記載の成膜方法であって、
前記周波数は、10kHz以上100kHz以下である
成膜方法。 - 請求項7~10のいずれか1つに記載の成膜方法であって、
前記第1ターゲット及び前記第2ターゲットのそれぞれを円筒型に構成し、
前記第1ターゲット及び前記第2ターゲットのそれぞれの中心軸を前記基板の搬送方向に対して交差させ、
前記第1ターゲット及び前記第2ターゲットのそれぞれをそれぞれの前記中心軸を軸に回転させながら前記第1ターゲットと前記第2ターゲットとの間に前記プラズマを発生させる
成膜方法。 - 請求項7~11のいずれか1つに記載の成膜方法であって、
前記第1ターゲットの内部に第1磁気回路を配置し、前記第2ターゲットの内部に第2磁気回路を配置し、
前記第1磁気回路が前記第1ターゲットに対向する向きと、前記第2磁気回路が前記第2ターゲットに対向する向きとを変えて、前記第1ターゲットと前記第2ターゲットとの間に前記プラズマを発生させる
成膜方法。 - 請求項9~12のいずれか1つに記載の成膜方法であって、
前記第1ターゲット及び前記第2ターゲットのそれぞれの前記スパッタリング率が異なる場合、前記スパッタリング率が低いターゲットに前記交流電圧をより長く印加する
成膜方法。
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GB2588936A (en) * | 2019-11-15 | 2021-05-19 | Dyson Technology Ltd | Sputter deposition |
GB2588938A (en) * | 2019-11-15 | 2021-05-19 | Dyson Technology Ltd | Sputter deposition |
JP2022092404A (ja) * | 2020-12-10 | 2022-06-22 | キヤノントッキ株式会社 | 成膜装置、成膜方法及び電子デバイスの製造方法 |
JP2022092406A (ja) * | 2020-12-10 | 2022-06-22 | キヤノントッキ株式会社 | 成膜装置、成膜方法及び電子デバイスの製造方法 |
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