WO2012095961A1 - プラズマ装置 - Google Patents
プラズマ装置 Download PDFInfo
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- WO2012095961A1 WO2012095961A1 PCT/JP2011/050363 JP2011050363W WO2012095961A1 WO 2012095961 A1 WO2012095961 A1 WO 2012095961A1 JP 2011050363 W JP2011050363 W JP 2011050363W WO 2012095961 A1 WO2012095961 A1 WO 2012095961A1
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- electrodes
- plasma
- target
- electrode
- target members
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
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- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/34—Gas-filled discharge tubes operating with cathodic sputtering
- H01J37/3411—Constructional aspects of the reactor
- H01J37/3414—Targets
- H01J37/3417—Arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/34—Gas-filled discharge tubes operating with cathodic sputtering
- H01J37/3411—Constructional aspects of the reactor
- H01J37/3414—Targets
- H01J37/3426—Material
Definitions
- the present invention relates to a plasma apparatus.
- a conventional plasma apparatus includes a target made of a dielectric, a magnet, a high-frequency power source, and a matching circuit (Non-Patent Document 1).
- a magnet is placed on the back side of the target to place a magnetic field on the surface of the target.
- the high frequency power source is connected to the target.
- the matching circuit is connected between the high-frequency power source and the target.
- the target is water cooled.
- the substrate to be processed and the substrate holder are arranged at positions facing the target.
- the substrate to be processed and the substrate holder are connected to a low frequency power source or a DC power source having a frequency lower than the frequency of the high frequency power source connected to the target in order to apply a bias according to the purpose.
- the operation of the conventional plasma apparatus is as follows.
- the high frequency voltage applied to the target generates plasma due to capacitive coupling between the target, the vacuum vessel, and the substrate.
- capacitively coupled high-frequency discharge causes high-frequency reflection due to plasma as the plasma density increases.
- high-frequency power does not enter the plasma effectively, and it is difficult to further increase the density.
- a high density is realized by creating a magnetic field near the surface of the target, capturing electrons in the plasma with this magnetic field, and causing a magnetron discharge.
- Electrons in the plasma reciprocate between the target and the substrate or vacuum vessel by an alternating electric field generated by a high-frequency voltage applied to the target, but a variable capacitor connected in series in a matching circuit and a dielectric that is a target material As a result, a negative DC bias is superimposed on the high-frequency voltage on the surface of the target.
- the positive ions in the plasma are attracted by this negatively charged DC bias and enter the target surface with high energy.
- the target surface is sputtered.
- the surface of the target is accompanied by a temperature rise, and the cooling of the target is necessary to stabilize the target surface and suppress the rise in the temperature of the opposing substrate due to radiation from the target.
- the particles sputtered on the target surface fly to the opposing substrate and form a film having an element configuration equivalent to that of the target. While the target is negatively charged, the substrate and the vacuum vessel have a relatively positive potential, so that the electrons that are negatively charged particles also fly to the substrate surface at the same time as the sputtered particles fly to the substrate surface. .
- the plasma on the target surface has a strong non-uniformity with the magnetic field distribution.
- a structure in which magnetic lines of force are arranged between the center and the periphery of the target is created.
- a donut-shaped high-density plasma is generated, and sputtering of the target also occurs in a donut shape. .
- an object of the present invention is to provide a plasma apparatus capable of suppressing the temperature rise of the substrate and the damage to the film formed on the substrate. .
- the plasma apparatus includes a plurality of electrodes, a plurality of target members, and first and second power supplies.
- the plurality of electrodes are arranged in a planar shape, and each has a rectangular planar shape.
- the plurality of target members are provided corresponding to the plurality of electrodes, each of which is made of a dielectric, and is disposed in contact with the surface of the corresponding electrode on the substrate side.
- the first power supply causes a high-frequency current having a first frequency to flow through the plurality of electrodes from one end of the plurality of electrodes.
- the second power supply applies a voltage having a second frequency to the plurality of electrodes so that a voltage having a second frequency lower than the first frequency is alternately applied to the two electrodes.
- plasma is generated by inductive coupling in the vicinity of the surfaces of a plurality of target members arranged in contact with the plurality of electrodes by causing the first power source to pass a high-frequency current through the plurality of electrodes. To do. Then, when the second power source applies a voltage having the second frequency to the plurality of electrodes, electrons and positive ions in the plasma flow into different target members, respectively, and between the plurality of electrodes and the plurality of target members. It stays near the surface.
- FIG. 1 is a schematic view of a plasma device according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a vacuum vessel, an electrode, a target member, a gas pipe 1 and a substrate holder between line II-II shown in FIG.
- FIG. 3 is an enlarged view of a region REG shown in FIG. 2.
- FIG. 4 is a cross-sectional view of a vacuum vessel, an electrode, a target member, and a substrate holder between lines IV-IV shown in FIG. It is a conceptual diagram for demonstrating operation
- FIG. 1 is a schematic view of a plasma apparatus according to an embodiment of the present invention.
- a plasma apparatus 10 according to an embodiment of the present invention includes a vacuum vessel 1, electrodes 2 and 3, target members 4 and 5, capacitors 6, 7, 13 to 15, and variable inductance 8 , 9, a matching circuit 11, a high frequency power source 12, a low frequency power source 16, filters 17 and 18, gas pipes 19 to 21, and a substrate holder 22.
- the vacuum vessel 1 has a hollow rectangular parallelepiped shape and is made of stainless steel.
- Each of the electrodes 2 and 3 has a rectangular planar shape and is made of metal.
- the electrodes 2 and 3 are arranged in a plane along the ceiling 1 ⁇ / b> A of the vacuum vessel 1 outside the vacuum vessel 1. In this case, the electrode 2 is separated from the electrode 3 by a certain distance.
- the target members 4 and 5 are provided corresponding to the electrodes 2 and 3, respectively. And each of the target members 4 and 5 is inserted in the through-hole provided in the ceiling 1A of the vacuum vessel 1, and is fixed to the ceiling 1A.
- the target member 4 is disposed in contact with the surface of the electrode 2 on the substrate 30 side, and the target member 5 is disposed in contact with the surface of the electrode 3 on the substrate 30 side.
- each of the target members 4 and 5 is made of a dielectric such as SiO 2 and Si 3 N 4 .
- the target members 4 and 5 are water cooled by a water cooling mechanism (not shown).
- capacitor 6 and the variable inductance 8 are connected in series between one end of the electrode 2 and the matching circuit 11.
- Capacitor 7 and variable inductance 9 are connected in series between one end of electrode 3 and matching circuit 11.
- the matching circuit 11 is connected between the high-frequency power source 12 and the variable inductances 8 and 9 and between the high-frequency power source 12 and the ground potential GND.
- the matching circuit 11 includes variable capacitors 111 and 112.
- the variable capacitor 111 is connected between the high frequency power supply 12 and the variable inductances 8 and 9.
- Variable capacitor 112 is connected between high-frequency power supply 12 and ground potential GND.
- the high frequency power supply 12 is connected to the variable capacitors 111 and 112 of the matching circuit 11.
- the capacitor 13 is connected between the other end of the electrode 2 and the capacitor 15.
- the capacitor 14 is connected between the other end of the electrode 3 and the capacitor 15.
- Capacitor 15 is connected between capacitors 13 and 14 and ground potential GND.
- the low frequency power supply 16 is connected to the filters 17 and 18.
- the filter 17 is connected between the low frequency power supply 16 and the electrode 2.
- the filter 18 is connected between the low frequency power supply 16 and the electrode 3.
- the gas pipes 19 to 21 are arranged in the vacuum vessel 1. And the gas piping 19 is arrange
- the gas pipe 20 is disposed between the adjacent electrodes 2 and 3 along the long side direction DR1 of the electrodes 2 and 3.
- the gas pipe 21 is disposed along the long side direction DR1 of the electrodes 2 and 3 on the outer side on the other side in the width direction of the electrodes 2 and 3 disposed in a plane.
- the substrate holder 22 is fixed to the bottom surface 1B of the vacuum vessel 1 by a support mechanism (not shown).
- the substrate holder 22 incorporates a heater.
- the substrate 30 is disposed so as to face the target members 4 and 5.
- An exhaust system that exhausts the gas in the vacuum container 1 is connected to the vacuum container 1.
- This exhaust system has, for example, a structure in which a turbo molecular pump and a rotary pump are connected in series, and the turbo molecular pump is connected to the vacuum vessel 1 side.
- the capacitor 6 supplies a high-frequency current (frequency: 1 MHz to 13.56 MHz) supplied via the variable inductance 8 to the electrode 2 from one end of the electrode 2.
- the capacitor 7 supplies the high frequency current supplied via the variable inductance 9 to the electrode 3 from one end of the electrode 3.
- variable inductances 8 and 9 allow the high-frequency current supplied from the high-frequency power source 12 through the matching circuit 11 to flow evenly through the electrodes 2 and 3.
- the high-frequency current I1 supplied to the electrode 2 and the high-frequency current I2 supplied to the electrode 3 are measured, and the variable inductances 8 and 9 are adjusted so that the measured high-frequency currents I1 and I2 are equal.
- the inductance value when the high-frequency currents I1 and I2 are equal may be measured in advance, and the inductance value may be set to the variable inductances 8 and 9.
- the matching circuit 11 supplies the high-frequency current supplied from the high-frequency power source 12 to the variable inductances 8 and 9 while suppressing the reflected wave.
- the high frequency power source 12 generates a high frequency current and supplies the generated high frequency current to the matching circuit 11.
- the capacitor 13 supplies a high-frequency current that has flowed through the electrode 2 to the capacitor 15.
- the capacitor 14 supplies the high frequency current flowing through the electrode 3 to the capacitor 15.
- Capacitor 15 allows the high-frequency current from capacitors 13 and 14 to flow to ground potential GND.
- the low frequency power supply 16 generates an alternating voltage in the range of 50 Hz to 50 kHz, and applies the generated alternating voltage to the electrodes 2 and 3 via the filters 17 and 18.
- This alternating voltage is a voltage that alternately changes positive and negative with respect to the ground potential.
- the filter 17 removes the high frequency component of the alternating voltage from the low frequency power supply 16 and applies the alternating voltage from which the high frequency component has been removed to the electrode 2.
- the filter 18 removes the high frequency component of the alternating voltage from the low frequency power supply 16 and applies the alternating voltage from which the high frequency component has been removed to the electrode 3.
- Each of the gas pipes 19 to 21 supplies, for example, argon gas (Ar gas) from the cylinder into the vacuum chamber 1.
- argon gas Ar gas
- the substrate holder 22 supports the substrate 30 and heats the substrate 30 to a desired temperature.
- FIG. 2 is a cross-sectional view of the vacuum vessel 1, electrodes 2 and 3, target members 4 and 5, gas pipes 19 to 21, and substrate holder 22 between the lines II and II shown in FIG.
- the target member 4 is bonded (bonded) to the electrode 2
- the target member 5 is bonded (bonded) to the electrode 3.
- the electrode 2 and the target member 4 are arranged so that the target member 4 forms one plane with the ceiling 1A of the vacuum vessel 1. Further, the electrode 3 and the target member 5 are arranged so that the target member 5 forms one plane with the ceiling 1 ⁇ / b> A of the vacuum vessel 1.
- Each of the insulating flanges 25 and 26 has a substantially L-shaped cross-sectional shape.
- the insulating flange 25 is disposed between the electrode 2 and the target member 4 and the ceiling 1A of the vacuum vessel 1
- the insulating flange 26 is disposed between the electrode 3 and the target member 5 and the ceiling 1A of the vacuum vessel 1. Is done.
- the grounding frames 23 and 24 are made of, for example, aluminum or stainless steel, and are fixed to the ceiling 1A of the vacuum vessel 1.
- the ground frame 23 closes one end side of the insulating flange 25.
- the ground frame 24 closes one end side of the insulating flange 26.
- Each of the electrodes 2 and 3 has a width W1.
- the distance between the electrode 2 and the electrode 3 is a distance D1.
- the width W1 is, for example, 50 mm to 200 mm, and the distance D1 is, for example, 100 mm to 200 mm.
- the electrodes 2 and 3 have the same area.
- the target members 4 and 5 have the same area as the electrodes 2 and 3, respectively.
- the distance between the target members 4 and 5 and the substrate 30 is, for example, 20 mm to 100 mm.
- the vacuum vessel 1 has an exhaust port EXH on the bottom surface 1B.
- the exhaust system is connected to the exhaust port EXH and exhausts the gas in the vacuum vessel 1.
- the gas pipes 19 to 21 have holes 19A, 20A, and 21A, respectively.
- the holes 19 ⁇ / b> A, 20 ⁇ / b> A, and 21 ⁇ / b> A are directed in a direction opposite to the direction from the electrodes 2 and 3 toward the substrate 30.
- a plurality of holes 19A, 20A, 21A are provided in the long side direction DR1 of the electrodes 2, 3 as shown in FIG.
- the low frequency power supply 16 applies an alternating voltage to the electrodes 2 and 3.
- FIG. 3 is an enlarged view of the region REG shown in FIG.
- a through hole 401 is provided in the insulating flange 25 and the electrode 2, and a tap hole 402 is provided in the ceiling 1 ⁇ / b> A of the vacuum vessel 1.
- the insulating collar 403 is inserted into the through hole 401.
- the bolt 404 passes through the insulating collar 403 and is screwed to the tap hole 402.
- the insulating collar 403 is provided to insulate the bolt 404 from the electrode 2.
- an O-ring 405 is disposed on the ceiling 1A of the vacuum vessel 1 in contact with the insulating flange 25, and an O-ring 406 is disposed on the electrode 2 in contact with the insulating flange 25.
- the O-rings 405 and 406 maintain the airtightness of the vacuum container 1.
- the insulating flange 25 has one end located in the space 410.
- the distance D2 between the one end side of the insulating flange 25 and the ceiling 1A of the vacuum vessel 1A and the distance D3 between the one end side of the insulating flange 25 and the target member 4 are set to be less than 1 mm.
- the interval D2 may be the same as or different from the interval D3.
- a tapped hole 407 is provided in the ceiling 1A of the vacuum vessel 1, and a through hole 408 is provided in the ground frame 23.
- the bolt 409 passes through the through hole 408 and is screwed to the tap hole 407.
- the ground frame 23 is fixed to the ceiling 1A of the vacuum vessel 1 so as to close the space 410 without contacting the target member 4 and the insulating flange 25.
- the grounding frame 23 is provided to prevent discharge in the space 410 and to prevent the insulating flange 25 from being exposed to plasma when plasma is generated in the vacuum vessel 1.
- the other electrode 2, the target member 4, the ground frame 23, and the insulating flange 25 shown in FIG. 2 have the same structure as that shown in FIG. 3. Further, the electrode 3 and the target member 5 shown in FIG. 2 are also fixed to the ceiling 1A of the vacuum vessel 1 by the same method as the electrode 2 and the target member 4 shown in FIG.
- FIG. 4 is a cross-sectional view of the vacuum vessel 1, the electrode 3, the target member 5, and the substrate holder 22 along the line IV-IV shown in FIG.
- the target member 5 is fixed to the ceiling 1A of the vacuum vessel 1 by the ground frame 24 at both ends in the long side direction DR1.
- the electrode 3 is fixed to the ground frame 24 by the insulating flange 26 so as to be in contact with the target member 5 at both ends in the long side direction DR1. Note that the electrode 3, the target member 5, the ground frame 24, and the insulating flange 26 have the same structure as that shown in FIG.
- the high frequency power supply 12 supplies a high frequency current to the electrode 3 from one end 3A of the electrode 3.
- the mechanism in which the electrode 2 is fixed to the ceiling 1A of the vacuum vessel 1 in the long side direction DR1 of the electrodes 2 and 3 is the same as the mechanism in which the electrode 3 shown in FIG.
- FIG. 5 is a conceptual diagram for explaining the operation of the plasma apparatus 10 shown in FIG.
- the inside of the vacuum vessel 1 is exhausted to 1 ⁇ 10 ⁇ 3 Pa or less using an exhaust system.
- Ar gas is introduced into the vacuum vessel 1 through the gas pipes 19 to 21.
- the flow rate of Ar gas is, for example, 50 to 200 sccm.
- Ar gas is supplied into the vacuum container 1 from the holes 19A, 20A, and 21A of the gas pipes 19 to 21 toward the ceiling 1A of the vacuum container 1. Then, the pressure in the vacuum vessel 1 is set in the range of 0.13 Pa to 133.3 Pa using the exhaust system.
- the high frequency power source 12 generates, for example, 5 kW high frequency power, and the generated 5 kW high frequency power is supplied to one end of the electrodes 2 and 3 via the matching circuit 11, the variable inductances 8 and 9, and the capacitors 6 and 7. Supply.
- the low frequency power supply 16 applies 5 kW low frequency power to the electrodes 2 and 3 via the filters 17 and 18. Thereby, an alternating voltage is applied to the electrodes 2 and 3.
- a high-frequency current having an equal current value flows through the electrodes 2 and 3 in the long side direction DR1.
- An induction electric field is generated around the target members 4 and 5 by the high-frequency current flowing through the electrodes 2 and 3 in the long-side direction DR1, and plasma 40 is generated by Ar gas introduced into the vacuum vessel 1.
- the charged particles (electrons and positive ions) in the plasma 40 remain in the region extending between the electrodes 2 and 3 and flow into the target members 4 and 5. Then, when positive ions flow in, the target members 4 and 5 are sputtered, and a film having substantially the same structure as the constituent elements of the target members 4 and 5 is deposited on the substrate 30.
- the high frequency power supply 12 stops supplying high frequency power
- the low frequency power supply 16 stops supplying low frequency power. Then, the supply of Ar gas into the vacuum container 1 is stopped, and the inside of the vacuum container 1 is exhausted to 1 ⁇ 10 ⁇ 3 Pa or less by an exhaust system. This completes the operation of forming a film by sputtering.
- a high frequency current is passed through the flat electrodes 2 and 3 from one end to the long side direction DR1.
- an induced electric field is generated in the vicinity of the surface of the target members 4 and 5 by the high-frequency current flowing through the electrodes 2 and 3, and the inductively coupled plasma 40 using Ar gas introduced into the vacuum vessel 1 is generated in the target members 4 and 5. Occurs near the surface.
- the distribution of the plasma 40 is not biased, and the target members 4 and 5 are consumed uniformly by sputtering. Therefore, the utilization efficiency of the target members 4 and 5 can be improved.
- the decomposition efficiency of the gas species is high, and the elements of the target members 4 and 5 and the decomposition species of the gas can be reacted efficiently.
- the plasma apparatus 10 uses plasma by inductive coupling, high-density plasma can be generated even under a low gas pressure, and a film can be generated in an environment with a good degree of vacuum. As a result, impurities in the formed film can be reduced.
- the Ar gas is ejected from the gas pipes 19 to 21 toward the ceiling 1A of the vacuum vessel 1, the direct influence of the Ar gas on the substrate 30 can be avoided, and the Ar gas can be avoided. It can be dispersed throughout the vacuum vessel 1.
- FIG. 6 is a conceptual diagram showing another electrode arrangement in the plasma apparatus 10 shown in FIG.
- electrodes 2 and 3 are replaced with electrodes 31 to 33
- target members 4 and 5 are replaced with target members 34 to 36
- variable inductances 8 and 9 are replaced with variable inductances 51 to 53. It may be replaced with.
- the plasma apparatus 10 further includes inductances 41 to 43.
- Each of the electrodes 31 to 33 has the same rectangular planar shape as the electrodes 2 and 3, and is made of aluminum.
- the electrodes 31 to 33 are arranged in contact with the target members 34 to 36 by the same method as the electrodes 2 and 3, respectively.
- the target members 34 to 36 are provided corresponding to the electrodes 31 to 33, respectively.
- the target members 34 to 36 are fixed to the ceiling 1A of the vacuum vessel 1 in a planar manner by the same method as the target members 4 and 5.
- the target members 34 to 36 have the same area as the electrodes 31 to 33, respectively, and are disposed in contact with the surface of the electrodes 31 to 33 on the substrate 30 side.
- the filter 17 removes the high frequency component of the alternating voltage received from the low frequency power supply 16 and applies the alternating voltage from which the high frequency component has been removed to the electrodes 31 and 33 via the inductances 41 and 42.
- the filter 18 removes the high frequency component of the alternating voltage received from the low frequency power supply 16 and applies the alternating voltage from which the high frequency component has been removed to the electrode 32 via the inductance 43.
- the low frequency power supply 16 applies an alternating voltage to the electrodes 31 to 33 so that the electrodes 31 and 33 have the same polarity and the electrode 32 has the opposite polarity to the electrodes 31 and 33. Apply to.
- the high frequency power supply 12 supplies a high frequency current to the electrodes 31 to 33 from one end 31A, 32A, 33A in the long side direction of the electrodes 31, 32, 33.
- the high frequency currents flowing through the electrodes 31 to 33 are I 31 to I 33
- the inductance value when the above relationship is established may be measured in advance, and the measured inductance value may be set in the variable inductances 51 to 53.
- capacitors corresponding to the capacitors 6 and 7 are omitted.
- FIG. 7 is a conceptual diagram showing still another electrode arrangement in the plasma apparatus 10 shown in FIG.
- electrodes 2 and 3 are replaced with electrodes 61 to 6n (n is an odd number of 3 or more)
- target members 4 and 5 are replaced with target members 71 to 7n
- variable inductance 8 , 9 may be replaced with variable inductances 91-9n.
- the plasma apparatus 10 further includes inductances 81 to 8n.
- Each of the electrodes 61 to 6n has the same rectangular planar shape as the electrodes 2 and 3, and is made of aluminum.
- the electrodes 61 to 6n are arranged in contact with the target members 71 to 7n by the same method as the electrodes 2 and 3, respectively.
- the target members 71 to 7n are provided corresponding to the electrodes 61 to 6n, respectively.
- the target members 71 to 7n are fixed to the ceiling 1A of the vacuum vessel 1 in a planar shape by the same method as the target members 4 and 5.
- the target members 71 to 7n have the same area as the electrodes 61 to 6n, respectively, and are arranged in contact with the surface of the electrodes 61 to 6n on the substrate 30 side.
- the filter 17 removes the high-frequency component of the alternating voltage received from the low-frequency power supply 16, and the alternating voltage from which the high-frequency component has been removed is applied to the electrodes 61, 63, 65 via the inductances 81, 83, 85,. ,..., 6n.
- the filter 18 removes the high-frequency component of the alternating voltage received from the low-frequency power supply 16, and the alternating voltage from which the high-frequency component has been removed is supplied to the electrodes 62, 64 via the inductances 82, 84,. ,..., 6n-1.
- the low frequency power supply 16 has electrodes 61, 63,..., 6n having the same polarity, and electrodes 62, 64,.
- An alternating voltage is applied to the electrodes 61 to 6n so as to have a polarity opposite to that of 63,.
- the high frequency power supply 12 supplies a high frequency current to the electrodes 61 to 6n from one end 61A to 6nA in the long side direction of the electrodes 61 to 6n.
- variable inductance inductance value thereof measured 91 may be set to ⁇ 9n.
- capacitors corresponding to the capacitors 6 and 7 are omitted.
- FIG. 8 is a conceptual diagram showing still another electrode arrangement in the plasma apparatus 10 shown in FIG.
- electrodes 2 and 3 are replaced with electrodes 101 to 104
- target members 4 and 5 are replaced with target members 105 to 108
- variable inductances 8 and 9 are variable inductances 121 to 124. It may be replaced with.
- the plasma apparatus 10 further includes inductances 113 to 116.
- Each of the electrodes 101 to 104 has the same rectangular planar shape as the electrodes 2 and 3, and is made of aluminum.
- the electrodes 101 to 104 are disposed in contact with the target members 105 to 108 by the same method as the electrodes 2 and 3, respectively.
- the electrodes 101 to 104 are arranged in a plane with the above-described distance D1.
- the electrodes 101 to 104 have the same area.
- the target members 105 to 108 are provided corresponding to the electrodes 101 to 104, respectively.
- the target members 105 to 108 are fixed to the ceiling 1A of the vacuum vessel 1 in a planar shape by the same method as the target members 4 and 5.
- the target members 105 to 108 have the same area as the electrodes 101 to 104, and are disposed in contact with the surface of the electrodes 101 to 104 on the substrate 30 side.
- the filter 17 removes the high-frequency component of the alternating voltage received from the low-frequency power source 16 and applies the alternating voltage from which the high-frequency component has been removed to the electrodes 105 and 107 via the inductances 113 and 114.
- the filter 18 removes the high frequency component of the alternating voltage received from the low frequency power supply 16 and applies the alternating voltage from which the high frequency component has been removed to the electrodes 106 and 108 via the inductances 115 and 116.
- the low frequency power supply 16 applies an alternating voltage to the electrode 101 so that the electrodes 101 and 103 have the same polarity and the electrodes 102 and 104 have the opposite polarity to the electrodes 101 and 103. To 104.
- the high frequency power supply 12 supplies a high frequency current to the electrodes 101 to 104 from one end 101A, 102A, 103A, 104A in the long side direction of the electrodes 101, 102, 103, 104.
- the variable inductances 121 to 124 adjust the high frequency currents flowing through the electrodes 101 to 104 so that the high frequency currents flowing through the electrodes 101 to 104 are equal to each other.
- variable inductances 121 to 124 may be adjusted to be equal to each other, or the inductance value when the high-frequency currents flowing through the electrodes 101 to 104 are equal to each other is measured in advance, and the measured inductance value is variable.
- the inductances 121 to 124 may be set.
- the electrodes 101 and 103 When the electrodes 101 and 103 are positively biased, electrons in the plasma 40 flow into the target members 105 and 107, and positive ions in the plasma 40 flow into the target members 106 and 108. Further, when the electrodes 101 and 103 are negatively biased, electrons in the plasma 40 flow into the target members 106 and 108, and positive ions in the plasma 40 flow into the target members 105 and 107.
- the areas of the electrodes 101 to 104 are equal to each other as described above. As a result, the area of the target member into which electrons flow is equal to the area of the target member into which positive ions flow, and the plasma 40 is stabilized.
- FIG. 9 is a conceptual diagram showing still another electrode arrangement in the plasma apparatus 10 shown in FIG.
- electrodes 2 and 3 are replaced with electrodes 131 to 13m (m is an even number of 4 or more)
- target members 4 and 5 are replaced with target members 141 to 14m
- variable inductance 8 , 9 may be replaced with variable inductances 151 to 15m.
- the plasma apparatus 10 further includes inductances 161 to 16m.
- Each of the electrodes 131 to 13m has the same rectangular planar shape as the electrodes 2 and 3, and is made of aluminum.
- the electrodes 131 to 13m are arranged in contact with the target members 141 to 14m by the same method as the electrodes 2 and 3, respectively.
- the electrodes 131 to 13m are arranged in a plane with the above-described distance D1.
- the areas of the electrodes 131 to 13m are equal to each other.
- the target members 141 to 14m are provided corresponding to the electrodes 131 to 13m, respectively.
- the target members 141 to 14m are fixed to the ceiling 1A of the vacuum vessel 1 in a planar manner by the same method as the target members 4 and 5.
- the target members 141 to 143m have the same area as the electrodes 131 to 13m, respectively, and are disposed in contact with the surface of the electrodes 131 to 13m on the substrate 30 side.
- the filter 17 removes the high-frequency component of the alternating voltage received from the low-frequency power supply 16, and the alternating voltage from which the high-frequency component has been removed is passed through the inductances 161, 163, ..., 16m-1 to the electrodes 131, 133,. ..Apply to 13m-1.
- the filter 18 removes the high-frequency component of the alternating voltage received from the low-frequency power supply 16, and the alternating voltage from which the high-frequency component has been removed is passed through the inductances 162, 164,..., 16m to the electrodes 132, 134,. ..Apply to 13m.
- the low frequency power supply 16 has electrodes 131, 133,..., 13m-1 having the same polarity, and electrodes 132, 134,.
- An alternating voltage is applied to the electrodes 131 to 13m so as to have a polarity opposite to that of 133,.
- the high frequency power supply 12 supplies a high frequency current to the electrodes 131 to 13m from one end 131A to 13mA in the long side direction of the electrodes 131 to 13m.
- the high frequency currents flowing through the electrodes 131 to 13m are adjusted so that the high frequency currents flowing through the electrodes 131 to 13m are equal to each other.
- the high-frequency current supplied to the electrodes 131 to 13m is measured.
- variable inductances 151 to 15m may be adjusted to be equal to each other, or the inductance value when the high-frequency currents flowing through the electrodes 131 to 13m are equal to each other is measured in advance, and the measured inductance value is variable.
- the inductance may be set to 151 to 15 m.
- the electrodes 131, 133,..., 13m-1 When the electrodes 131, 133,..., 13m-1 are positively biased, the electrons in the plasma 40 flow into the target members 141, 143,. It flows into the target members 142, 144, ..., 14m. In addition, when the electrodes 131, 133,..., 13m-1 are negatively biased, positive ions in the plasma 40 flow into the target members 141, 143,. Electrons flow into the target members 142, 144,. The areas of the electrodes 131 to 13m are equal to each other as described above. As a result, the area of the target member into which electrons flow is equal to the area of the target member into which positive ions flow, and the plasma 40 is stabilized.
- a high-frequency current is caused to flow from one end in the long side direction to two or more electrodes, and near the surface of the target member.
- a plasma 40 is generated by inductive coupling.
- the charged particles (electrons and positive ions) in the plasma 40 remain between the electrodes and in the vicinity of the surface of the target member.
- FIG. 10 is a schematic view of another plasma apparatus according to the embodiment of the present invention.
- the plasma apparatus according to the embodiment of the present invention may be a plasma apparatus 10A shown in FIG.
- plasma apparatus 10A is the same as plasma apparatus 10 except that electrodes 2 and 3 of plasma apparatus 10 shown in FIG.
- the electrodes 201 and 301 are disposed in contact with the target members 4 and 5 in the same manner as the electrodes 2 and 3, respectively.
- the electrodes 201 and 301 have the same area.
- FIG. 11 is a plan view and a cross-sectional view of the electrode 201 shown in FIG.
- FIG. 11A is a plan view
- FIG. 11B is a cross-sectional view.
- electrode 201 includes a flat plate member 2010 and capacitive elements 2020 to 2023.
- the flat plate member 2010 has a rectangular planar shape and is made of metal.
- the capacitive elements 2020 to 2023 are arranged in the long side direction DR1 of the electrode 201 at regular intervals D4.
- the interval D4 is determined according to the length of the electrode 201, and is, for example, 150 to 300 mm.
- Each of the capacitive elements 2020 to 2023 is provided on the surface 2010A of the flat plate member 2010 on the substrate 30 side over the entire width W1 of the flat plate member 2010.
- Each of the capacitive elements 2020 to 2023 has a width W2 in the long side direction DR1 of the electrode 201.
- the width W2 is, for example, 10 to 40 mm.
- the capacitor element 2020 includes a through hole 2011, metal plates 2012 and 2013, capacitors 2014 and 2015, and an insulator 2016.
- the through hole 2011 passes through the flat plate member 2010 and has a width W2.
- Each of the metal plates 2012 and 2013 has a substantially L-shaped cross-sectional shape.
- One end of the metal plate 2012 is electrically connected to the flat plate member 2010 on one side of the through hole 2011.
- One end of the metal plate 2013 is electrically connected to the flat plate member 2010 on the other side of the through hole 2011.
- the capacitors 2014 and 2015 are connected in parallel between the metal plate 2012 and the metal plate 2013.
- the insulator 2016 is filled in the through hole 2011 so as to cover a part of the metal plates 2012 and 2013 and the capacitors 2014 and 2015.
- Each of the capacitive elements 2021 to 2023 has the same configuration as the capacitive element 2020.
- the electrode 201 has a configuration in which the inductance and the capacitance are electrically connected in series in the long side direction DR1. As a result, the impedance in the long side direction DR1 of the electrode 201 is lowered.
- the impedance of the electrode 201 is the smallest when the resonance condition is satisfied, and the potential difference between both ends of the electrode 201 consists only of the potential difference due to the resistance component.
- the electrode 301 shown in FIG. 10 has the same configuration as the electrode 201 shown in FIG.
- the operation of forming a film on the substrate 30 by sputtering in the plasma apparatus 10A is the same as the operation of forming a film on the substrate 30 by sputtering in the plasma apparatus 10.
- the plasma apparatus 10A includes the electrodes 201 and 301 in which the plurality of capacitive elements 2020 to 2023 arranged in the long side direction DR1 are arranged at a constant interval D2, and thus the long side direction DR1 of the electrodes 201 and 301 is included.
- the impedance at the time decreases, and more high-frequency current flows in the long side direction DR1 of the electrodes 201 and 301.
- the density of the plasma 40 by inductive coupling can be increased. Further, in the plasma apparatus 10A, plasma with a small potential difference can be generated even if the lengths of the electrodes 201 and 301 are increased.
- the plurality of capacitive elements 2020 to 2023 may not be arranged at a constant interval D2 in the long side direction DR1 of the electrodes 201 and 301. If the capacitive elements 2020 to 2023 are arranged so as to be orthogonal to the direction of the high-frequency current, the impedance in the long-side direction DR1 of the electrodes 201 and 301 is reduced compared to the case where the capacitive elements 2020 to 2023 are not arranged, and the plasma 40 This is because the plasma density can be increased and plasma with a small potential difference can be generated.
- the same changes may be made as in the case where the electrodes 2 and 3 are replaced with the electrodes 31 to 33, the electrodes 61 to 6n, the electrodes 101 to 104, and the electrodes 131 to 13m in the plasma apparatus 10. Therefore, in the plasma apparatus 10A as well, a film can be formed on the substrate 30 having an arbitrary size while suppressing the temperature rise and damage to the film during film formation.
- Ar gas is used as the sputtering gas.
- the present invention is not limited thereto, and a mixed gas of Ar gas and oxygen gas or nitrogen gas is used as the sputtering gas. It may be used.
- each of the plasma devices 10 and 10A is disposed along the long side direction DR1 of the electrodes 2 and 3 and the like, and is a hole directed from the substrate 30 toward the target member (target members 4 and 5 and the like).
- the gas pipes 19 to 21 having 19A, 20A, and 21A are provided, in the embodiment of the present invention, the plasma apparatus according to the embodiment of the present invention is not limited to this. What is necessary is just to provide the gas piping which introduces gas.
- the plasma device is arranged in a planar shape, each provided with a plurality of electrodes each having a rectangular planar shape, each corresponding to the plurality of electrodes, each made of a dielectric, and A plurality of target members arranged in contact with the surface of the corresponding electrode on the substrate side, a first power source for flowing a high-frequency current having a first frequency from one end of the plurality of electrodes to the plurality of electrodes, And a second power source that applies a voltage having the second frequency to the plurality of electrodes so that a voltage having a second frequency lower than the first frequency is alternately applied to the two electrodes.
- the plasma apparatus includes a plurality of electrodes, a plurality of target members, and a first power source and a second power source, a high frequency current is caused to flow to the plurality of electrodes by the first power source.
- a high frequency current is caused to flow to the plurality of electrodes by the first power source.
- plasma due to inductive coupling can be generated, and by applying a voltage having the second frequency to the plurality of electrodes alternately by the second power source, electrons and positive ions in the plasma flow into different target members.
- electrons and positive ions in the plasma remain between the plurality of electrodes and in the vicinity of the surfaces of the plurality of target members, and suppress the temperature rise and damage to the film during film formation, thereby forming a film on the substrate 30. This is because it can be formed.
- This invention is applied to a plasma apparatus.
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Abstract
Description
Claims (7)
- 平面状に配置され、各々が長方形の平面形状を有する複数の電極と、
前記複数の電極に対応して設けられ、各々が誘電体からなり、かつ、対応する電極の基板側の表面に接して配置される複数のターゲット部材と、
前記複数の電極の一方端から第1の周波数を有する高周波電流を前記複数の電極に流す第1の電源と、
前記第1の周波数よりも低い第2の周波数を有する電圧が2つの電極に交互に印加されるように前記第2の周波数を有する電圧を前記複数の電極に印加する第2の電源とを備えるプラズマ装置。 - 前記複数の電極の各々は、
前記平面形状を有し、金属からなる平板部材と、
前記平板部材の長辺方向において前記平板部材の前記基板側の表面に形成された複数の貫通孔に挿入され、各々の両端が前記平板部材に電気的に接続された複数の容量素子と、
前記複数の容量素子を覆う複数の絶縁物とを含む、請求項1に記載のプラズマ装置。 - 前記複数の容量素子の各々は、前記平板部材に並列に接続された複数のコンデンサからなる、請求項2に記載のプラズマ装置。
- 前記複数の貫通孔は、一定の間隔で前記平板部材に形成されている、請求項2または請求項3に記載のプラズマ装置。
- 前記第1の電源と前記複数の電極との間に配置され、前記複数の電極に流れる複数の前記高周波電流を同等に設定する複数のインダクタンスを更に備える、請求項1から請求項4のいずれか1項に記載のプラズマ装置。
- 隣接する2つの電極間と前記複数の電極の外側とにおいて、前記電極の長辺方向に沿って配置された複数のガス配管を更に備える、請求項1から請求項5のいずれか1項に記載のプラズマ装置。
- 前記複数のガス配管の各々は、前記電極から前記基板へ向かう方向と反対方向を向いている複数の孔を有する、請求項6に記載のプラズマ装置。
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PCT/JP2011/050363 WO2012095961A1 (ja) | 2011-01-12 | 2011-01-12 | プラズマ装置 |
JP2012552562A JP5655865B2 (ja) | 2011-01-12 | 2011-01-12 | プラズマ装置 |
CN2011800540485A CN103201407A (zh) | 2011-01-12 | 2011-01-12 | 等离子体装置 |
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CN102883515A (zh) * | 2012-09-24 | 2013-01-16 | 西安交通大学 | 一种大气压平板介质阻挡等离子体射流放电的阵列装置 |
JP2017091898A (ja) * | 2015-11-13 | 2017-05-25 | 株式会社日本製鋼所 | プラズマ発生部およびプラズマスパッタ装置 |
JP2018059205A (ja) * | 2016-10-05 | 2018-04-12 | フォン アルデンヌ ゲーエムベーハー | バイポーラマグネトロンスパッタリングのための方法及びマグネトロンスパッタリング装置 |
JPWO2019004184A1 (ja) * | 2017-06-27 | 2019-12-19 | キヤノンアネルバ株式会社 | プラズマ処理装置 |
JPWO2019004186A1 (ja) * | 2017-06-27 | 2020-01-09 | キヤノンアネルバ株式会社 | プラズマ処理装置 |
JPWO2019004185A1 (ja) * | 2017-06-27 | 2020-01-09 | キヤノンアネルバ株式会社 | プラズマ処理装置 |
JP2020024927A (ja) * | 2017-06-27 | 2020-02-13 | キヤノンアネルバ株式会社 | プラズマ処理装置 |
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