WO2002058441A1 - Dispositif plasma et procede de generation de plasma - Google Patents
Dispositif plasma et procede de generation de plasma Download PDFInfo
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- WO2002058441A1 WO2002058441A1 PCT/JP2002/000323 JP0200323W WO02058441A1 WO 2002058441 A1 WO2002058441 A1 WO 2002058441A1 JP 0200323 W JP0200323 W JP 0200323W WO 02058441 A1 WO02058441 A1 WO 02058441A1
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- electromagnetic field
- conductor member
- cavity
- plasma
- frequency electromagnetic
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- 238000000034 method Methods 0.000 title claims description 29
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 254
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- 230000010287 polarization Effects 0.000 description 12
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Classifications
-
- 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
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32192—Microwave generated discharge
- H01J37/32211—Means for coupling power to the plasma
- H01J37/3222—Antennas
-
- 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
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32192—Microwave generated discharge
-
- 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
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32192—Microwave generated discharge
- H01J37/32211—Means for coupling power to the plasma
- H01J37/32229—Waveguides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/3244—Gas supply means
Definitions
- the present invention relates to a plasma apparatus and a plasma generation method that generate plasma by using an electromagnetic field supplied into a processing chamber using a slot antenna.
- plasma devices are frequently used to perform processes such as formation of oxide films, crystal growth of semiconductor layers, etching, and asshing.
- plasma devices there is a high-frequency plasma device that supplies a high-frequency electromagnetic field into a processing chamber using a slot antenna and generates high-density plasma using the electromagnetic field.
- This high-frequency plasma device is characterized in that it can stably generate plasma even when the pressure of the plasma gas is relatively low.
- in-plane distribution the two-dimensional distribution (hereinafter referred to as “in-plane distribution”) of plasma uniform on a processing surface such as a semiconductor substrate.
- FIG. 21 is a diagram showing a configuration example of a conventional high-frequency plasma device.
- FIG. 21 shows a longitudinal sectional structure of a part of a conventional high-frequency plasma device.
- a conventional plasma apparatus includes a cylindrical processing vessel 111 having a bottom and an open top, a dielectric plate 113 closing an upper opening of the processing vessel 111, and a dielectric plate 113 above the dielectric plate 113. And a radial antenna 130 for radiating a high-frequency electromagnetic field in the processing vessel 111.
- a substrate table 1 2 2 is fixed to the bottom of the processing vessel 1 1 1.
- the substrate 121 to be processed is arranged on the mounting surface.
- an exhaust port 1 16 for evacuation is provided at the bottom of the processing container 111, and a nozzle 117 for supplying the plasma gas and the process gas is provided on the side wall of the processing container 111. ing.
- the dielectric plate 113 is made of quartz glass or the like, and a seal member (not shown) such as an O-ring is interposed between the dielectric plate 113 and the processing container 111 so that the plasma in the processing container 111 is reduced. We do not leak to the outside.
- the radial antenna 130 is a kind of slot antenna, and includes two circular conductor plates 13 1 and 13 2 that are parallel to each other and form the radial waveguide 13 3. And a conductor ring connecting the outer peripheral portions of the first and second outer rings.
- an inlet 135 for introducing a high-frequency electromagnetic field into the radius antenna 130 is formed in the center of the conductor plate 132, which is the upper surface of the radial waveguide 133.
- An electromagnetic field F propagating in the radial waveguide 13 3 is radiated into the processing vessel 1 1 1 via the dielectric plate 13 on the conductor plate 13 1 serving as the lower surface of the radial waveguide 13 3.
- a plurality of slots 1336 are formed in the circumferential direction to form the antenna surface of the radial antenna 130. Further, the outer peripheries of the radial antenna 130 and the dielectric plate 113 are covered with an annular shield member 112 so that the electromagnetic field does not leak outside.
- the conventional plasma device includes a high-frequency generator 145 that generates a high-frequency electromagnetic field to supply a rotating electromagnetic field, and a rectangular waveguide that guides the high-frequency electromagnetic field output from the high-frequency generator 145.
- a rectangular-cylindrical converter 1 4 7 for connecting a rectangular waveguide and a cylindrical waveguide, and a circular polarization converter 1 for converting a linearly polarized high-frequency electromagnetic field into a rotating electromagnetic field 4 and 6 were equipped.
- a pair of cylindrical protrusions 146A made of a conductor facing the inner wall of the cylindrical waveguide is set in the axial direction.
- a plurality of sets are used.
- These cylindrical projections 1 4 6 A are arranged in a direction at 45 ° to the main direction of the electric field of the TE 11 mode electromagnetic field input from the rectangular-to-cylindrical converter 1 4 7.
- / 4 ( ⁇ is the pipe of the propagating electromagnetic wave (Wavelength), and converts the TE11 mode high-frequency electromagnetic field into a rotating electromagnetic field in which the main direction of the electric field rotates around the axis of the cylindrical waveguide.
- FIG. 22 is a diagram schematically illustrating a state of an electromagnetic field propagating inside the rectangular waveguide 143, the rectangular-cylindrical converter 147, and the circular polarization converter 146.
- FIG. 22 (a) shows the state of the electric field at A--A 'of the electromagnetic field propagating through the rectangular waveguide 143 shown in FIG. 21, and FIGS. 22 (b), (e), and (f) show The state of the electric field at the exit B-B 'of the rectangular-cylindrical converter 147, and Figs. 22 (c), (d), and (g) show the electric field of the electromagnetic field propagating through the circular polarization converter 146 and the direction of rotation. Show.
- the high-frequency electromagnetic field (Fig. 22 (a)) transmitted through the rectangular waveguide 143 in the TE10 mode from the high-frequency generator 145 is converted to the TE11 mode by the rectangular-cylindrical converter 147 (Fig. 22 (b)).
- the wave converter is introduced into 146 cylindrical waveguides. Then, it is converted into a rotating electromagnetic field while propagating through the circular polarization converter 146 (FIG. 22 (c)), and is supplied into the radial antenna 130 from the inlet 135 formed at the center of the conductor plate 132.
- the radial antenna 130 is supplied with a mixture of rotating electromagnetic fields having different phases and different directions of rotation, and the polarization of the high-frequency electromagnetic field at that time becomes an ellipse as shown in FIG. 23. Become. Then, the uniformity of the in-plane distribution of the plasma generated in the processing vessel is reduced, and the plasma processing particularly at the peripheral portion becomes uneven.
- the present invention has been made to solve such a problem, and an object of the present invention is to improve in-plane uniformity of plasma distribution.
- a plasma device is a plasma device including a slot antenna for supplying a high-frequency electromagnetic field supplied via a power supply unit into a processing container, wherein the power supply unit Has a cavity that constitutes a resonator and converts a fed high-frequency electromagnetic field into a rotating electromagnetic field and supplies it to the slot antenna.
- the power supply unit Has a cavity that constitutes a resonator and converts a fed high-frequency electromagnetic field into a rotating electromagnetic field and supplies it to the slot antenna.
- a circularly polarized rotating high-frequency electromagnetic field is supplied into the slot antenna while the rotating electromagnetic field resonates in the cavity.
- This plasma device may include a ring member provided around the opening of the cavity in the slot antenna and having the same inner diameter as the inner diameter of the cavity. By adjusting the thickness and width of the ring member, the proportion of the high-frequency electromagnetic field supplied to the slot antenna among the high-frequency electromagnetic fields that resonate in the cavity can be adjusted.
- the above-described cavity includes a circular conductor member connected to an outer conductor of a coaxial waveguide that supplies a high-frequency electromagnetic field, and one end connected to the circular conductor member. And the other end is formed of a cylindrical conductor member opened in the slot antenna, and is provided at a position radially separated from the center of the circular conductor member in the radial direction.
- a power supply pin connected thereto; a perturbation pin provided at a predetermined angle with respect to a center of the power supply pin and the circular conductor and having one end connected to the circular conductor member.
- the other end of the feeding pin may be open, or the slot antenna May be connected to the antenna surface on which the slot that constitutes is formed.
- a frusto-conical conductive member spreading on the antenna surface side may be provided at the other end of the power supply pin.
- the other end of the perturbation pin may be open or connected to the antenna surface. Further, it may be connected to a cylindrical conductor member.
- the other end of the power supply pin may be connected to the cylindrical conductor member.
- the other end of the perturbation pin may be connected to an antenna surface on which a slot constituting a slot antenna is formed, or may be connected to a cylindrical conductor member.
- the above-mentioned cavity includes a circular conductor member connected to an outer conductor of a coaxial waveguide that supplies a high-frequency electromagnetic field, and one end connected to the circular conductor member. And the other end thereof is formed of a cylindrical conductor member open to the inside of the slot antenna, and a conductive member opposed to the inside of the side wall of the cylindrical conductor member, and is separated from the center of the circular conductor member in the radial direction.
- a power supply pin is provided at a position and connected to the inner conductor of the coaxial waveguide and one end thereof.
- the cavity is formed by the conductive member disposed inside the side wall of the cylindrical conductor member so as to have cutouts whose cross sections perpendicular to the axis of the cylindrical conductor member face each other. You. As a result, the high-frequency electromagnetic field fed via the coaxial waveguide is converted into a rotating electromagnetic field in the cavity, and supplied to the slot antenna while resonating.
- the conductive member disposed opposite to the inside of the side wall of the cylindrical conductor member may extend from one end to the other end of the cylindrical conductor member.
- the length of the cylindrical conductive member in the axial direction is substantially equal to the wavelength of the high-frequency electromagnetic field.
- the length of the parallel portion between the conductive member and the power supply pin is approximately 1/4 of the wavelength of the high-frequency electromagnetic field, and a good rotating electromagnetic field can be obtained within the cavity.
- the conductive member may have a slope-shaped end at the side of the slot antenna.
- the length of the main body excluding the end of the cylindrical member may be approximately 1 to 4 of the wavelength of the high-frequency electromagnetic field in the axial direction of the cylindrical conductive member.
- the other end of the feed pin may be connected to the antenna surface on which the slot constituting the slot antenna is formed, or approximately 1 Z of the wavelength of the high-frequency electromagnetic field from the circular conductor member in the axial direction of the cylindrical conductor member. It may be connected to the conductor member at a distance of four.
- a conductive member provided inside the side wall of the cylindrical conductor member one or more sets of opposing columnar protrusions made of a conductor may be provided in the axial direction.
- the above-mentioned cavity includes an elliptical conductor member connected to an outer conductor of a coaxial waveguide that supplies a high-frequency electromagnetic field, and one end of the elliptical conductor member. And the other end is open in the slot antenna, is formed of a cylindrical conductor member having an elliptical cross section, is separated from the center of the elliptical conductor member in the radial direction, and has a major axis and a minor axis. And a feed pin which is provided at a predetermined angle with the inner conductor of the coaxial waveguide and is connected to the inner conductor of the coaxial waveguide.
- a high-frequency electromagnetic field fed via a coaxial waveguide is converted into a rotating electromagnetic field in a cavity having an elliptical cross section, and supplied to the slot antenna while resonating.
- the other end of the power supply pin may be connected to the antenna surface on which the slot constituting the slot antenna is formed, or approximately 1 Z 4 It may be connected to the conductor member at a remote position.
- the above-mentioned cavity includes a circular conductor member connected to the outer conductor of the first and second coaxial waveguides for supplying a high-frequency electromagnetic field, and one end thereof. Is formed of a cylindrical conductor member connected to the circular conductor member and having the other end opened in the slot antenna, and provided at a position radially separated from the center of the circular conductor member in the radial direction.
- a first power supply pin connected to the inner conductor of the waveguide, and a first power supply pin and an inner portion of the second coaxial waveguide provided at a predetermined angle with respect to a center of the circular conductor and the center of the circular conductor.
- a second supply connected to a conductor And an electrical pin.
- each of the first and second feed pins may be connected to an antenna surface on which a slot constituting a slot antenna is formed, or from a circular conductor member to an axis of a cylindrical conductor member. It may be connected to the conductor member at a position approximately 1 Z4 away from the wavelength of the high-frequency electromagnetic field in the direction.
- the above-described cavity includes a circular conductor member connected to an outer conductor of at least one coaxial waveguide that supplies a high-frequency electromagnetic field, and one end of the circular conductor member.
- a high-frequency electromagnetic field fed from at least one coaxial waveguide is radiated into the cavity as a rotating electromagnetic field while being formed from a cylindrical conductor member connected to a circular conductor member and having the other end opened into the slot antenna.
- a patch antenna wherein the patch antenna includes a circular conductor member, and a conductor plate which is arranged to face the circular conductor member at a predetermined interval and is connected to the inner conductor of at least one coaxial waveguide.
- the high-frequency electromagnetic field fed through the coaxial waveguide is radiated into the cavity as a rotating electromagnetic field by the patch antenna, and supplied to the slot antenna while resonating.
- the above-mentioned cavities include one side or end face of a rectangular waveguide for supplying a high-frequency electromagnetic field, and one end of one side or one side of the rectangular waveguide.
- a cylindrical conductor member connected to the termination surface and having the other end opened into the slot antenna; and a high-frequency electromagnetic field is radiated into the cavity as a rotating electromagnetic field on one side surface or the termination surface of the rectangular waveguide. It is characterized in that a plurality of slots are formed.
- the high-frequency electromagnetic field fed through the rectangular waveguide is radiated into the cavity as a rotating electromagnetic field by a plurality of slots formed on one side or the end surface of the rectangular waveguide, It is supplied into the slot antenna while resonating.
- the plurality of slots may be two slots that cross each other at a midpoint.
- the slot composed of these two slots is called a cross slot.
- the plurality of slots may be two slots that are arranged apart from each other and extend in directions substantially perpendicular to each other.
- the slot composed of these two slots is called a C-shaped slot.
- the plasma generation method is a plasma generation method for generating a plasma by supplying a high-frequency electromagnetic field to a slot antenna and supplying the high-frequency electromagnetic field to the processing container ⁇ ⁇ from the slot antenna, wherein the resonator is configured.
- a high-frequency electromagnetic field is supplied to the cavity, and the high-frequency electromagnetic field converted into a rotating electromagnetic field is supplied to the slot antenna while converting the high-frequency electromagnetic field into a rotating electromagnetic field and causing resonance in the cavity.
- the high-frequency electromagnetic field supplied to the slot antenna can be converted into a circularly polarized rotating electromagnetic field.
- a power supply pin and a perturbation pin are provided in a cavity forming a resonator, so that a high-frequency electromagnetic field supplied via a coaxial waveguide is rotated by a rotating electromagnetic field. It converts it into a world and resonates in the cavity.
- a high-frequency electromagnetic field is supplied to a cavity having cutouts whose cross sections perpendicular to the propagation direction of the high-frequency electromagnetic field are opposed to each other via a coaxial waveguide. By doing so, this is converted into a rotating electromagnetic field and resonated within the cavity.
- a third configuration example of the plasma generation method according to the present invention is characterized in that a high-frequency electromagnetic field is fed to a cavity having an elliptical cross section perpendicular to the propagation direction of the high-frequency electromagnetic field through a coaxial waveguide, This is converted into a rotating electromagnetic field and resonated within the cavity.
- a high frequency electromagnetic field having a phase difference of 90 ° is supplied to the cavity forming the resonator via the first and second coaxial waveguides. This generates a rotating electromagnetic field and resonates in the cavity.
- a fifth configuration example of the plasma generation method according to the present invention is provided through a coaxial waveguide.
- a high-frequency electromagnetic field fed from a rectangular waveguide is transmitted from a plurality of slots formed on one side surface or terminal surface of the rectangular waveguide to a cavity. By radiating it into the inside, a rotating electromagnetic field is generated.
- FIG. 1 is a diagram illustrating a plasma device according to a first embodiment of the present invention.
- FIG. 2 is a diagram illustrating a power supply unit of the plasma device according to the first embodiment of the present invention.
- FIG. 3 is a diagram illustrating electric field distribution in a power supply unit of the plasma device according to the first example of the present invention.
- FIG. 4 is a diagram illustrating a power supply unit of the plasma device according to the second embodiment of the present invention.
- FIG. 5 is a diagram illustrating the operation and effect of the power supply unit of the plasma device according to the second embodiment of the present invention.
- FIG. 6 is a diagram illustrating a modified example of the power supply unit of the plasma device according to the second embodiment of the present invention.
- FIG. 7 is a diagram illustrating a modified example of the power supply unit of the plasma device according to the second embodiment of the present invention.
- FIG. 8 is a diagram illustrating a power supply unit of the plasma device according to the third embodiment of the present invention.
- FIG. 9 is a diagram illustrating a modified example of the power supply unit of the plasma device according to the third embodiment of the present invention.
- FIG. 10 is a diagram illustrating a modification of the power supply unit of the plasma device according to the third embodiment of the present invention.
- FIG. 11 is a diagram illustrating a power supply unit of a plasma device according to a fourth embodiment of the present invention.
- FIG. 12 is a diagram illustrating a power supply unit of a plasma device according to a fifth embodiment of the present invention. It is.
- FIG. 13 is a diagram illustrating a power supply unit of a plasma device according to a sixth embodiment of the present invention.
- FIG. 14 is a diagram illustrating a power supply unit of a plasma device according to a seventh embodiment of the present invention.
- FIG. 15 is a diagram illustrating a power supply unit of the plasma device according to the eighth embodiment of the present invention.
- FIG. 16 is a view for explaining a design example of a cross slot used in the plasma device according to the eighth embodiment of the present invention.
- FIG. 17 is a diagram illustrating a modified example of the power supply unit of the plasma device according to the eighth embodiment of the present invention.
- FIG. 18 is a view for explaining another example of the slot used in the plasma device according to the eighth embodiment of the present invention.
- FIG. 19 is a plan view showing the shape of the slot.
- FIG. 20 is a diagram illustrating a configuration example of a radial antenna that can be used in the present invention.
- FIG. 21 is a diagram illustrating a conventional plasma device.
- FIG. 22 is a diagram illustrating modes of an electromagnetic field in a conventional plasma device.
- FIG. 23 is a schematic diagram showing an in-plane distribution of plasma in a conventional plasma device. Detailed description of the embodiment
- FIGS. 1 to 3 are diagrams illustrating a plasma apparatus according to a first embodiment of the present invention.
- this plasma apparatus has a cylindrical processing container 11 having a bottom and an open top, a dielectric plate 13 closing the upper opening of the processing container 11 and a dielectric plate 13 A radial antenna 30 radiating (or leaking) a high-frequency electromagnetic field into the processing vessel 11 placed on the plate 13, and a shielding material covering the outer circumferences of the radial antenna 30 and the dielectric plate 13 2 And
- the processing vessel 11 and the dielectric plate 13 A sealing member 14 such as an O-ring is interposed between the processing chamber 11 and the vacuum chamber to maintain the vacuum in the processing chamber 11 and prevent plasma from leaking to the outside.
- a substrate table 22 on which a substrate 21 to be processed is placed is provided so as to be able to move up and down via an elevating shaft 23.
- This board base 22 is electrically connected to a high frequency power supply 26 for bias via a matching box 25.
- a bellows 24 connected to the bottom of the substrate table 22 and the insulator plate 15 provided on the bottom of the processing container 11 is provided around the lifting shaft 23. Have been.
- the processing vessel 11 is further provided with an exhaust port 16 for evacuation and a nozzle 17 for supplying plasma gas and process gas.
- the radial antenna 30 is composed of two parallel circular conductor plates 3 1, 3 2 forming the radial waveguide 33, and a conductor ring 3 connecting the outer peripheral portions of these conductor plates 3 1, 3 2. It consists of four.
- FIG. 1 (b) is a cross-sectional view taken along the line Ib-Ib 'of the plasma apparatus shown in FIG. 1 (a).
- a plurality of slots 36 are formed in the circumferential direction to form the antenna surface of the radial antenna 30. .
- a power supply unit described later is provided at the center of the conductor plate 32 which is the upper surface of the radial waveguide 33.
- the high-frequency electromagnetic field generated in the high-frequency generator 45 propagates through the rectangular waveguide 43 through the matching circuit 44, and is transmitted to the rectangular-coaxial converter 42.
- the power is converted from the TE 10 mode to the TEM mode, and the power is supplied to the power supply unit of the radial antenna 30 via the coaxial waveguide 41.
- the power supply section includes a circular conductor member 51 A connected to the outer conductor 41 A of the coaxial waveguide 41 for supplying a high-frequency electromagnetic field, and one end having the circular conductor member 51 A.
- Power supply pin 5 2 connected to conductor 4 1 B and open at the other end, and perturbation connected at one end to circular conductor member 5 1 A and open at the other end Consists of pins 53.
- the feed pin 52 and the perturbation pin 53 convert an electromagnetic field supplied via the coaxial waveguide 41 into a rotating electromagnetic field.
- FIG. 1 (c) is a cross-sectional view taken along line Ic-Ic 'of FIG. 1 (a).
- the cavity 35 forms a resonator together with the conductor plate 31 of the radial antenna 30, and a part of the high-frequency electromagnetic field resonating in the cavity 35 is supplied to the radial waveguide 33.
- a ring member 54 having the same inner diameter as the inner diameter of the cylindrical conductor member 51B (that is, the inner diameter of the cavity 35) is provided around the opening of the cavity 35 provided at the center of the conductor plate 32 of the radial antenna 30. I have.
- the ratio of the high-frequency electromagnetic field supplied to the radial waveguide 33 to the high-frequency electromagnetic field that resonates in the cavity 35 can be adjusted.
- the value obtained by dividing the energy of the electromagnetic field resonating and remaining in the cavity 35 by the energy of the electromagnetic field supplied from the cavity 35 to the radial waveguide 33 in the electromagnetic field supplied to the cavity 35 is the ⁇ Q value ''. Called.
- FIG. 2A is a schematic diagram showing a power supply unit when viewed from the side
- FIG. 2B is a schematic diagram showing an arrangement of a power supply pin 52 and a perturbation pin 53.
- the center axis of the cylindrical cavity 35 extends from the center axis of the cylindrical conductor member 51B.
- Distance to inner surface (hereinafter referred to as “cavity radius”) a is about 7.3 to 7.5 cm, and distance between circular conductor member 51 A and circular conductor plate 31 of radial antenna 30 (hereinafter, referred to as “radius of cavity”). D) (called “cavity depth”) can be about 3.6 cm.
- the diameter of the radial antenna 30 is about 48 cm, and the height h, which is the distance between the conductor plates 31 and 32, is 1.5 to 1.6 cm.
- the width c of the ring member 54 forming the cavity 35 together with the cylindrical conductor member 51B is about 3.1 cm, which corresponds to about 1/4 of the wavelength of the electromagnetic wave.
- the length 1 ⁇ the feeding pin 52 connected to the inner conductor 41 B of the coaxial waveguide 41 1. 75 ⁇ 2. 6 cm, 1. 75 ⁇ the length 1 2 of the perturbation pins 53 2.1 cm.
- the power supply pin 52 is designed to be slightly longer than the perturbation pin 53. Good to do.
- the Q value of the cavity 35 increases, and the ratio of the electromagnetic field supplied to the radial waveguide 33 can be reduced.
- a Q value of about 30 is a guide.
- ⁇ 135 °.
- the mechanism of generating a rotating electromagnetic field by the feed pin 52 and the perturbation pin 53 can be described as follows.
- the component E1 of the electric field ⁇ in the direction of the perturbation pin 53 in the above-mentioned electric field ⁇ is affected by the capacitance component between the feed pin 52 and the perturbation pin 53, and the phase is Is late.
- the lengths of the feed pin 52 and the perturbation pin 53 so that the phase delay becomes 90 °, a rotating electromagnetic field in the TM11 mode can be obtained.
- the high-frequency electromagnetic field generated by the high-frequency generator 45 is supplied to the cavity 35 through the coaxial waveguide 41, and the rotating electromagnetic field is supplied by the power supply pin 52 and the perturbation pin 53.
- the radial waveguide 33 of the radial antenna 30 is supplied to the radial waveguide 33 of the radial antenna 30.
- High-frequency electromagnetic field supplied into radial antenna 30 Propagates through the radial waveguide 33, and an electromagnetic field F propagating through the radial waveguide 33 is radiated (or leaked) into the processing vessel 11 from these slots 36, and is processed through the nozzle 17.
- Plasma S introduced into the vessel 11 is ionized to generate plasma S.
- the rotating electromagnetic field in the cavity 35 is supplied to the radial waveguide 33. Therefore, by converting the high-frequency electromagnetic field into a circularly polarized wave by the feed pin 52 and the perturbation pin 53, a good circularly polarized high-frequency electromagnetic field is radiated from the radial antenna 30 into the processing vessel 11 (or Leaks), and the uniformity of the generated plasma S in-plane distribution can be improved.
- the feeding pin 52 since the other end (tip) of the feeding pin 52 whose one end is connected to the inner conductor 41B of the coaxial waveguide 41 is opened to excite the electromagnetic field in the voltage mode, the feeding pin The voltage amplitude becomes maximum at the tip of 52. For this reason, when power is supplied with a high power of several kW to several tens of kW, the tip of the feed pin 52, the tip of the perturbation pin 53, the cylindrical conductor member 51 of the cavity 35, or the radial It is desirable to design the feeding unit so that no discharge occurs between the antenna 30 and the conductor plate 31. In order to suppress the discharge, the distance from the tip of the power supply pin 52 to the tip of the perturbation pin 53, the cylindrical conductor member 51B or the conductor plate 31 may be increased.
- the pins 53 may have different lengths.
- the leading end of the power supply pin 52 provided in the cavity 35 is open.
- the power supply pin The tip of 52 A is short-circuited. That is, as shown in FIG. 4, one end of the feed pin 52A is connected to the inner conductor 41B of the coaxial waveguide 41, and the other end forming the tip is a conductor plate which is the radial antenna 30th antenna surface. 3 Connected to 1 and short-circuited.
- the depth d of the cavity 35 which is the distance between the circular conductor member 51A of the cavity 35 and the conductor plate 31 of the radial antenna 30, is about L2.
- Tip on conductor plate 3 1 Since the length 1 i of the connected power supply pin 52 A is equal to the depth d of the cavity 35, it is about / 2.
- FIG. 5 (a) is a schematic diagram showing the power supply section when viewed from the side
- Fig. 5 (b) is a conceptual diagram showing the current distribution on the power supply pin 52A
- Fig. 5 (c) is the power supply pin 52.
- FIG. 3 is a conceptual diagram showing a voltage distribution on A.
- the current amplitude becomes maximum at the tip of the feed pin 52A, as shown in FIG. Since the phase is 90 ° out of phase with the voltage, the voltage amplitude at the tip of the power supply pin 52A is 0 (zero). Also, since the length It of the power supply pin 52A is about 1/2, the voltage distribution on the power supply pin 52A is as shown in Fig. 5 (c), and the position where the voltage amplitude is maximum is determined by the capacitance.
- the electromagnetic field in the cavity 35 is excited by the AC electric field around the center of the depth d of 35.
- the perturbation pin 53 only needs to have a length such that the phase delay of the component E1 in the direction of the perturbation pin 53 in the electric field E excited by the feed pin 52 is 90 °, and the length 1 2 may be any example Bruno about 4.
- 1 2 about 3 cm. With such a length, the high-frequency electromagnetic field excited in the cavity 35 can be converted into a good TM11 mode rotating electromagnetic field.
- the following effects can be obtained.
- a conductive member 37 may be provided at the tip of the power supply pin 52A connected to the conductor plate 31 of the radial antenna 30.
- the conductive member 37 has a connection surface with the conductor plate 31 as a bottom surface, and has a truncated cone shape extending toward the conductor plate 31. You. By using the conductor member 37 having such a shape, a high-frequency electromagnetic field resonating in the cavity 35 can be easily introduced into the radial waveguide 33.
- the conductive member 37 does not need to be symmetrical with respect to the extension of the power supply pin 52A.
- the inclination angle of the side surface of the conductive member 37 with respect to the extension of the power supply pin 52A may be increased as the distance between the side surface and the conductor plate 32 opposed to each other is smaller.
- the inclination angle of the left side surface of the conductive member 37 may be larger than the inclination angle of the right side surface.
- the other end of the perturbation pin 53A having one end connected to the circular conductor member 51A is connected to the conductor plate of the radial antenna 30 in the same manner as the power supply pin 52A. 3 May be connected to 1. Thereby, it is possible to prevent discharge from occurring between perturbation pin 53 A and conductive plate 31.
- the tip of the power supply pin 52A may be connected to the cylindrical conductor member 51B.
- the power supply pin 52A extends from the connection point with the inner conductor 41B of the coaxial waveguide 41 in the axial direction of the cylindrical conductor member 51B, and is bent at a right angle. It is connected perpendicularly to the inner wall surface of the conductor member 51B. Even in this case, discharge from the power supply pin 52 A can be suppressed.
- the tip of the perturbation pin may be open, may be connected to the conductor plate 31 of the radial antenna 30, or may be connected to the cylindrical conductor member 51B as shown in FIG. Good.
- the length of the parallel portion between the power supply pin 52A and the perturbation pin to about 1/4, a favorable rotating electromagnetic field can be generated in the cavity 53.
- the perturbation pin 53A may be connected to the cylindrical conductor member 51B with the end of the feed pin open or connected to the conductor plate 31 of the radial antenna 30.
- the perturbation pin 53 is provided in the cavity 35 constituting the power supply unit.
- the plasma device according to the third embodiment uses the cavity 35 A circular conductor member 51 A connected to the outer conductor 41 A of the coaxial waveguide 41 to be fed, and a cylinder having one end connected to the circular conductor member 51 A and the other end opened in the radial antenna 30 Conductor member 51B and side wall of this cylindrical conductor member 51B
- the power supply pins 52 formed of the conductive members 61A and 61B opposed to each other and connected to the inner conductor 41B of the coaxial waveguide 41 are circular conductor members 51A. Is provided at a position radially separated from the center of the.
- the conductive members 61A and 6IB have one ends connected to a circular conductive member 51A forming one end surface of the cavity 35, and the shaft of the cylindrical conductive member 51B. Extending in the direction.
- the cross-sectional shape of the conductive members 61A and 61B in the villa-villa direction is, as shown in Fig. 8 (a), an arc following the inside of the side wall of the cylindrical conductor 51B and a chord connecting the arcs. Consists of
- the conductive members 61A and 61B are arranged inside the side wall of the cylindrical conductive member 51B so that the cross section perpendicular to the center axis of the cavity 35 is reduced. It will have a notch. That is, the cross section of the cavity 35 is shorter than the direction connecting the cutouts (hereinafter referred to as “cutout direction”) in the direction orthogonal to the force cutout direction. Therefore, the capacity of the cavity 35 in the notch direction is relatively increased.
- the conductive members 61A, 61B having the cross-sectional shape as described above are provided on the cylindrical conductor member 51B. Although they are electrically connected, they may be integrally formed by construction.
- the cutout of the cross section of the cavity 35 and the power supply pin 52 form a straight line passing through the power supply pin 52 and the central axis (the center of the circular conductor member 51 A), There is a positional relationship with the notch direction at an angle of about 45 °.
- the notch direction component E 1 is delayed in phase by the effect of the relatively large capacitance. Therefore, by setting the size of the notch and the position of the power supply pin 52 such that the phase difference between the component E 2 orthogonal to the notch direction and the component E 2 is 90 °, the rotational electromagnetic field of the TE 11 mode is set. Can be obtained.
- the high-frequency electromagnetic field generated by the high-frequency generator 45 is supplied to the cavity 35 via the coaxial waveguide 41.
- the fed high-frequency electromagnetic field has a cross section perpendicular to the center axis and the feed pin 52.
- the cavity 35 having a pair of cutouts opposed to each other it is converted into a rotating electromagnetic field, and at the same time, a part of the cavity 35 resonates while being resonated at the cavity 35.
- the high-frequency electromagnetic field supplied into the radial antenna 30 propagates through the radial waveguide 33, and the electromagnetic field F propagating through the radial waveguide 33 enters the processing vessel 11 from these slots 36.
- Plasma S is generated by ionizing the plasma gas emitted (or leaked) and introduced into the processing chamber 11 through the nozzle 17.
- the rotating electromagnetic field resonating in the cavity 35 is supplied to the radial waveguide 33. Therefore, by converting the high-frequency electromagnetic field into circular polarization in the cavity 35, a good circularly-polarized high-frequency electromagnetic field is radiated (or leaked) from the radial antenna 30 into the processing vessel 11 and generated. The uniformity of the in-plane distribution of the plasma S can be improved.
- the phase difference between the notch direction component E 1 and the direction component E 2 perpendicular to the notch direction component E 1 of the electric field E generated by the feed pin 52 is 90 °, and a good rotating electromagnetic field is obtained.
- the ends of the conductive members 6 IE and 61 F on the radial antenna 30 side may be formed in a slope shape.
- the cross-sectional shape of the cavity 35 as viewed from a direction perpendicular to the center axis of the cavity 35 is a shape having a tapered portion at the connection with the radial waveguide 33.
- conductive members 61 1 to 61F extending axially from one end are provided on the inner wall surface of the cylindrical conductor member 51 ⁇ , and the cross section of the cavity 35 is notched.
- one or more sets of conductor cylindrical protrusions opposing each other are formed on the inner wall surface of the cylindrical conductor member 51 mm as a conductive member. It may be provided in the direction.
- the plasma device according to the fourth embodiment has an elliptical cross section perpendicular to the center axis of the cavity 35 forming the power supply portion.
- the above-mentioned cavity 35 is composed of an elliptical conductor member connected to the outer conductor 41 ⁇ ⁇ of the coaxial waveguide 41 supplying the high-frequency electromagnetic field, and another end connected to the elliptical conductor member at one end.
- the end is open into the radial antenna 30 and is formed of a tubular conductor member 51 B ′ having an elliptical cross section.
- a ring member 54 having the same inner surface shape as the cylindrical conductor member 51B 'may be provided around the opening of the cavity 35 provided at the center of the conductor plate 32 of the radial antenna 30. .
- the power supply pin 52 is arranged at a position spaced apart from the center of the elliptical conductor member in the radial direction and at an angle of 45 ° from the major axis and the minor axis of the ellipse. ing.
- the elliptical minor-axis direction component E 1 is delayed in phase due to the effect of the relatively large capacitance. Therefore, by setting the cross-sectional shape of the cavity 35 and the position of the power supply pin 52 so that the phase difference with the major-axis direction component E 2 becomes 90 °, a rotating electromagnetic field of the TE 11 mode can be obtained. Can be.
- the high-frequency electromagnetic field supplied to the cavity 35 via the coaxial waveguide 41 is connected to the power supply pin 52 and the elliptical shape.
- a part thereof is supplied to the radial waveguide 33 of the radial antenna 30 while resonating in the cavity 35.
- the Q value can be adjusted.
- the plasma device according to the fifth embodiment supplies two points of power to a cavity 35 formed of a circular conductor member 51A and a cylindrical conductor member 51B via two coaxial waveguides. It is.
- first and second power supply pins 52 A connected to inner conductors of the first and second coaxial waveguides are connected to a circular conductor member 51 A. , 52B are provided radially away from the center axis of the circular conductor member 51A, and the positions of these two power supply pins 52A, 52B are perpendicular to the center axis. It is doing.
- a high-frequency electromagnetic field whose phase is different by 90 ° from each other is supplied from the first and second coaxial waveguides, whereby a rotating electromagnetic field of TE 11 mode is generated in the cavity 35.
- a phase conversion circuit may be used.However, two coaxial waveguides having different lengths by 1/4 of the wavelength of the propagating electromagnetic field are transmitted to the same phase high-frequency wave. An electromagnetic field may be supplied.
- the plasma device having such a power supply unit by performing the two-point power supply as described above, the high-frequency electromagnetic field supplied from the two coaxial waveguides is converted into a rotating electromagnetic field, and at the same time, the above-mentioned cavity 3 While resonating at 5
- the radial waveguide 33 is supplied to the radial waveguide 33. Therefore, as in the first to third embodiments described above, by converting the high-frequency electromagnetic field into circularly polarized waves in the cavity 35, a favorable circularly-polarized high-frequency electromagnetic field can be converted from the radial antenna 30 into a processing container. The uniformity of the in-plane distribution of the generated plasma S radiated (or leaked) in 11 can be improved.
- the ratio of the high-frequency electromagnetic field supplied to the radial waveguide 33 to the high-frequency electromagnetic field that resonates in the cavity 35 that is, The ability to adjust the Q value is the same as in the other embodiments described above.
- the plasma device generates a rotating electromagnetic field by feeding a patch antenna in a cavity 35 formed by a circular conductor member 51A and a cylindrical conductor member 51B.
- the patch antenna 71 used for feeding the patch antenna includes a grounded circular conductor member 51A, and a dielectric plate 72 disposed on the lower surface of the circular conductor member 51A. And a conductor plate 73 disposed opposite to the circular conductor member 51A via the dielectric plate 72.
- the outer conductors 41 A and 47 A of the two coaxial waveguides 41 and 47 are connected to the circular conductor member 51 A, and two coaxial conductors are connected to the conductor plate 73.
- the internal conductors 41B and 47B of the waveguides 41 and 47 are connected.
- FIG. 13B is a plan view when the conductor plate 73 is viewed from the Xlllb-Xlllb 'line direction. As shown in FIG. 13 (b), the plane shape of the conductor plate 73 is a square with approximately one side; L gl Z2. gl means the wavelength of the high-frequency electromagnetic field propagating between the circular conductor member 51A and the conductor plate 73.
- the inner conductors 41 B and 47B of the two coaxial waveguides 41 and 47 are connected to two points on the X-axis and the y-axis, which are approximately equidistant from the origin O on the conductor plate 73. These two points are called feeding points P and Q.
- the cavity 35 is fed into the cavity 35.
- a rotating electromagnetic field of TE 11 mode can be generated. The principle is as follows.
- the current supplied to the feeding point P from one coaxial waveguide 41 resonates in the X-axis direction
- the y-axis of the conductor plate 73 is The linearly polarized wave parallel to the X-axis is radiated from two sides parallel to.
- the current supplied to the feeding point Q from the other coaxial waveguide 47 resonates in the y-axis direction, 73 Linearly polarized waves parallel to the y-axis are emitted from two sides parallel to the X-axis.
- the phases of the two radiated linearly polarized waves are also different from each other by 90 °. Since the forces are equal in amplitude and spatially orthogonal to each other, they are circularly polarized and a rotating electromagnetic field is generated in the cavity 35.
- the rotating electromagnetic field generated in this manner resonates in the cavity 35, and a part thereof is supplied to the radial waveguide 33 of the radial antenna 30. Therefore, as in the other embodiments described above, a good circularly polarized high-frequency electromagnetic field is radiated (or leaked) from the radial antenna 30 into the processing vessel 11 and the in-plane distribution of the generated plasma S is Uniformity can be improved.
- the high-frequency electromagnetic field supplied to the radial waveguide 33 is controlled.
- the ratio, that is, the Q value can be adjusted, as in the other embodiments described above.
- a phase conversion circuit may be used, but two coaxial waveguides having different lengths by / of the wavelength of the propagating electromagnetic field.
- An in-phase high-frequency electromagnetic field may be supplied to the tube.
- the planar shape of the conductor plate 73 included in the patch antenna 71 may be a 90 ° rotationally symmetrical shape such as a circle (in addition to the square shown in FIG. 13B). (When they are rotated 90 ° to each other). However, in the case of a circle The diameter should be approximately 1.17X; L gl / 2. Furthermore, the planar shape of the conductor plate 73 may be a shape such as a rectangle having different lengths in two orthogonal directions viewed from the center thereof. In this case, the difference between the feed phases at the two feed points P and Q is not adjusted to 90 °, but adjusted by the length in the above two directions.
- the sixth embodiment uses a two-point feed patch antenna 71 using two coaxial waveguides 41 and 47, whereas the seventh embodiment uses a single coaxial waveguide.
- a single-point feeding patch antenna 75 using the 41 is used.
- the patch antenna 75 includes a grounded circular conductor member 51A, a dielectric plate 72 disposed on the lower surface of the circular conductor member 51A, and a dielectric plate 72A. And a conductor plate 76 disposed opposite to the circular conductor member 51A via 72.
- the outer conductor 41 A of the coaxial waveguide 41 is connected to the circular conductor member 51 A, and the inner conductor 41 B of the coaxial waveguide 41 is connected to the conductor plate 73.
- FIG. 14 (b) is a plan view when the conductor plate 76 is viewed from the direction of line XIVb—XIV !. As shown in FIG.
- the planar shape of the conductor plate 76 has a shape in which a part of the peripheral area of the circle 76A is cut away. More specifically, it has a rectangular shape with two regions near the intersection of the circumference and the y-axis. The notch area should be about 3% of the area of the circle 76A.
- the length of the conductor plate 76 in the X-axis direction is set to 1.17 X Xg / 2
- the length in the y-axis direction is set to 1.17 Xe gl / 2 ⁇ 2 d.
- the inner conductor 41B of the coaxial waveguide 41 is connected to one point on a straight line that crosses the X axis and the y axis at an angle of 45 °. This point is called the feeding point V.
- the current supplied from the coaxial waveguide 41 to the feeding point V of the conductor plate 76 flows independently in the X-axis direction and the y-axis direction.
- the length in the y-axis direction is shorter than 1.17X; t gl Z 2 by 2 d, the dielectric constant seen by the electromagnetic field increases, and the phase of the current flowing in the y-axis direction is delayed.
- a circularly polarized wave is radiated from the patch antenna 75 and the rotating electromagnetic field of the TE 11 mode is set in the cavity 35. Is generated.
- the rotating electromagnetic field generated in this way resonates in the cavity 35, Then, a part thereof is supplied to the radial waveguide 33 of the radial antenna 30.
- the plane shape of the conductor plate 76 is not limited to the shape shown in FIG. 14 (b), but may be any shape as long as the length in at least two orthogonal directions viewed from the center of the conductor plate 76 is different. . Thus, for example, it may be elliptical, its Oyo length of the long side; a L gl / 2, the length of the short side may be rectangular less than Oyosoe gl Z 2.
- the plasma device according to the eighth embodiment uses a rectangular waveguide 81 of TE 10 mode in a cavity 35 formed of a circular conductor member 51A and a cylindrical conductor member 51B.
- a rotating electromagnetic field is generated by slot feeding.
- a cross slot 82 is formed on the E surface (side surface perpendicular to the electric field in the tube) of the rectangular waveguide 81 used for the slot feeding.
- the cross slot 82 has a configuration in which two slots having different lengths intersect at the center of each other.
- the center of each of these two slots, that is, the center of the cross slot 82, is substantially on the center axis of the E plane.
- each slot of the two slots constituting the cross slot 82 is adjusted so that the frequency characteristics with respect to 2.45 GHz differ relatively by about 55 ° to 70 °.
- the angle of each slot is adjusted so that the amplitude of the radiated electric field by each slot becomes equal.
- the center of the cross slot 82 is rectangular waveguide 81 so that the amplitude of the radiated electromagnetic field due to the cross slot 82 is maximized. It is arranged at a position apart lg 2/2; from the end 8 3 substantially. ; The L g 2, a wavelength of a high-frequency electromagnetic field propagating in the rectangular waveguide 8 1.
- FIG. 16 shows a design example of the cross slot 82.
- FIG. 16 is a plan view of the E plane of the rectangular waveguide 81 viewed from the XVI-XVI ′ direction.
- the two slots constituting the cross slot cross each other at a substantially right angle, and are approximately 4 Five ° Inclined.
- the length of each slot is 5.57 cm and 6.06 cm, respectively.
- the two slots constituting the cross slot intersect each other at approximately 107 °, and are substantially aligned with the center axis of the E plane of the rectangular waveguide 81. 36. 5 ° inclined.
- the length of each slot is 5.32 cm and 7.26 cm, respectively.
- the E-plane of the rectangular waveguide 81 in which the cross slot 82 is formed is joined to the circular conductor member 51 A forming one end face of the cavity 35.
- the cross slot 82 is arranged so that its center coincides with the center axis of the cavity 35. At least a region facing the cross slot 82 is opened in the circular conductor member 51A, so that a high-frequency electromagnetic field propagating through the rectangular waveguide 81 is radiated into the cavity 35.
- the center of the cross slot 82 and the center axis of the cavity 35 do not necessarily have to match.
- one end of the cylindrical conductor member 51B may be closed by the E surface of the rectangular waveguide 81, and a part of the E surface of the rectangular waveguide 81 may constitute the circular conductor member 51A.
- the high-frequency electromagnetic field generated by the high-frequency generator 45 propagates through the rectangular waveguide 81 and is radiated into the cavity 35 from the cross slot 82 formed on the E-plane.
- the high-frequency electromagnetic field radiated into the cavity 35 becomes a TE 11 mode circularly polarized wave, and a rotating electromagnetic field is generated.
- a part of the rotating electromagnetic field is supplied to the radial waveguide 33 of the radial antenna 30 while resonating in the cavity 35.
- a good circularly polarized high-frequency electromagnetic field is radiated (or leaked) from the radial antenna 30 into the processing vessel 11 and the generated plasma S has a uniform in-plane distribution. Performance can be improved.
- a cross slot 85 may be provided on the end surface of the TE 10 mode rectangular waveguide 84 to supply the slot power.
- the end of this rectangular waveguide 84 The configuration of the cross slot 85 formed on the surface is substantially the same as the configuration of the cross slot 82 formed on the E surface. That is, the cross slot 85 is composed of two slots that intersect at the center of each other, and these two slots are adjusted so that the frequency characteristics for 2.45 GHz are relatively different by about 55 ° to 70 °. And their lengths are different from each other. However, the center of the cross slot 85 is arranged substantially at the center of the end face of the rectangular waveguide 84.
- FIG. 17 (b) shows a design example of the cross slot 85.
- FIG. 17 (b) is a plan view of the terminal surface of the rectangular waveguide 84 viewed from the direction of the line XVIIb-XVIII.
- the two slots that make up the cross slot cross each other at a substantially right angle, and the virtual slot generated at the center of the rectangular waveguide 84 It is inclined at an angle of about 45 °.
- the length of each slot is 5.57 cm and 6.06 cm, respectively.
- a rotating electromagnetic field can be generated in the cavity 35 by feeding a high-frequency electromagnetic field from the cross slot 85 formed on the end surface of the rectangular waveguide 84. Therefore, as in the case where power is supplied from the cross slot 82 formed on the E surface of the rectangular waveguide 81, the uniformity of the in-plane distribution of the plasma S generated in the processing chamber 11 can be improved. .
- slot power supply using cross slots 82 and 85 has been described. However, as shown in FIG. 18, two slots 87 A and 87 B that are perpendicular to each other are separated from each other.
- the slot power supply may be performed by using a so-called C-shaped slot arranged in the slot.
- the cross-sectional shape of the slots constituting the cross slots 82 and 85 or the U-shaped slots may be rectangular as shown in Fig. 19 (a) or may be rectangular as shown in Fig. 19 (b).
- a shape in which both ends of two parallel straight lines are connected by a curve such as an arc may be used.
- the length L of the slot is the length of the long side of the rectangle in FIG. 19 (a), and is the length of the position where the interval between the two opposite curves is maximum in FIG. 19 (b).
- the cross sections of the rectangular waveguides 81 and 84 A matching circuit 44 may be arranged between the portion where the slots 82 and 85 are formed and the high-frequency generator 45. Thereby, the reflected power from the plasma load can be returned to the load side again without returning to the high frequency generator 45, and the power can be efficiently supplied to the plasma.
- the conductor plate 31 forming the slot surface is flat, but the slot surface is formed like the radial antenna 3OA shown in FIG.
- the conductive plate 31A may have a conical surface shape.
- the electromagnetic field radiated (or leaked) from the conical slot surface is obliquely incident on the plasma surface defined by the flat dielectric plate 13. For this reason, the efficiency of electromagnetic field absorption by the plasma is improved, so that the standing wave existing between the antenna surface and the plasma surface can be weakened, and the uniformity of the plasma distribution can be improved.
- the conductor plate 31A constituting the antenna surface of the radial antenna 3OA may have a convex shape other than the conical surface shape.
- the convex shape may be convex upward or convex downward.
- the circular conductor member 51A forming one end surface of the cavity 35 may have a convex shape following the conductor plate 31A of the radial antenna 3OA.
- the rotating electromagnetic field Since a part of the rotating electromagnetic field is supplied to the slot antenna while resonating in the cavity, the rotating electromagnetic field is circularly polarized in the cavity, thereby supplying the rotating electromagnetic field having a circular polarization to the slot antenna. As a result, the uniformity of the in-plane distribution of the generated plasma can be improved.
- the present invention can be used for processing using plasma, such as etching, CVD, and asshing.
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Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/466,602 US7243610B2 (en) | 2001-01-18 | 2002-01-18 | Plasma device and plasma generating method |
EP02715809A EP1361782A4 (en) | 2001-01-18 | 2002-01-18 | PLASMA DEVICE AND PLASMA PRODUCTION METHOD |
KR1020037009440A KR100549678B1 (ko) | 2001-01-18 | 2002-01-18 | 플라즈마 장치 및 플라즈마 생성 방법 |
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JP2001010291 | 2001-01-18 | ||
JP2001-10291 | 2001-01-18 | ||
JP2001-247853 | 2001-08-17 | ||
JP2001247853A JP3625197B2 (ja) | 2001-01-18 | 2001-08-17 | プラズマ装置およびプラズマ生成方法 |
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WO2002058441A1 true WO2002058441A1 (fr) | 2002-07-25 |
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US (1) | US7243610B2 (ja) |
EP (1) | EP1361782A4 (ja) |
JP (1) | JP3625197B2 (ja) |
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2002
- 2002-01-18 US US10/466,602 patent/US7243610B2/en not_active Expired - Fee Related
- 2002-01-18 KR KR1020037009440A patent/KR100549678B1/ko not_active IP Right Cessation
- 2002-01-18 EP EP02715809A patent/EP1361782A4/en not_active Withdrawn
- 2002-01-18 WO PCT/JP2002/000323 patent/WO2002058441A1/ja active IP Right Grant
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Also Published As
Publication number | Publication date |
---|---|
US7243610B2 (en) | 2007-07-17 |
KR100549678B1 (ko) | 2006-02-08 |
KR20040062870A (ko) | 2004-07-09 |
JP2002289398A (ja) | 2002-10-04 |
US20040095074A1 (en) | 2004-05-20 |
EP1361782A4 (en) | 2006-03-29 |
JP3625197B2 (ja) | 2005-03-02 |
EP1361782A1 (en) | 2003-11-12 |
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