WO2022091860A1 - プラズマ処理装置 - Google Patents
プラズマ処理装置 Download PDFInfo
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- WO2022091860A1 WO2022091860A1 PCT/JP2021/038547 JP2021038547W WO2022091860A1 WO 2022091860 A1 WO2022091860 A1 WO 2022091860A1 JP 2021038547 W JP2021038547 W JP 2021038547W WO 2022091860 A1 WO2022091860 A1 WO 2022091860A1
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- plasma
- magnets
- ions
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- 150000002500 ions Chemical class 0.000 claims abstract description 92
- 239000000758 substrate Substances 0.000 claims abstract description 50
- 238000010884 ion-beam technique Methods 0.000 claims abstract description 32
- 230000000903 blocking effect Effects 0.000 claims description 13
- 230000005672 electromagnetic field Effects 0.000 claims description 5
- 238000009832 plasma treatment Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 28
- 238000009792 diffusion process Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 4
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- 229910052782 aluminium Inorganic materials 0.000 description 3
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- 238000000034 method Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
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- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 230000005284 excitation Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 239000010703 silicon Substances 0.000 description 1
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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
- H01J37/32431—Constructional details of the reactor
- H01J37/32697—Electrostatic control
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J27/00—Ion beam tubes
- H01J27/02—Ion sources; Ion guns
- H01J27/16—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation
-
- 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
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/05—Electron or ion-optical arrangements for separating electrons or ions according to their energy or mass
-
- 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
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/08—Ion sources; Ion guns
-
- 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
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/10—Lenses
- H01J37/12—Lenses electrostatic
-
- 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
- H01J37/02—Details
- H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
- H01J37/147—Arrangements for directing or deflecting the discharge along a desired path
- H01J37/1472—Deflecting along given lines
- H01J37/1474—Scanning means
- H01J37/1475—Scanning means magnetic
-
- 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
- H01J37/32422—Arrangement for selecting ions or species in the plasma
-
- 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
- H01J37/3266—Magnetic control means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/04—Means for controlling the discharge
- H01J2237/047—Changing particle velocity
- H01J2237/0473—Changing particle velocity accelerating
- H01J2237/04735—Changing particle velocity accelerating with electrostatic means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/10—Lenses
- H01J2237/12—Lenses electrostatic
- H01J2237/1207—Einzel lenses
Definitions
- This disclosure relates to a plasma processing apparatus.
- Patent Document 1 an ion source for selecting and outputting specific ions is provided outside the processing container in which plasma treatment of the substrate is performed, and only specific ions are supplied from the ion source to the inside of the processing container.
- a technique for reducing damage to a substrate is disclosed.
- the present disclosure provides a technique capable of reducing damage to a substrate and reducing the size of a device.
- the plasma processing apparatus is arranged in a processing container in which a substrate targeted for plasma processing is arranged, a plasma generation unit that generates plasma in the processing container, and the processing container. It has a focusing unit that focuses a plurality of ions in the plasma and outputs an ion beam, and a sorting unit that selects specific ions supplied to the substrate from the ion beam output from the focusing unit. ..
- FIG. 1 is a diagram schematically showing a plasma processing apparatus according to an embodiment.
- FIG. 2 is a schematic cross-sectional view showing the configuration of the focusing section and the sorting section according to the embodiment.
- FIG. 3 is a diagram showing an example of the arrangement of two pairs of magnets according to the embodiment.
- the ion source includes a plasma generation source and a component such as a pipe connected to the plasma generation source and a processing container and provided with an electromagnet capable of generating a magnetic field for selecting specific ions. Therefore, in the plasma processing apparatus, the space occupied by these parts becomes large outside the processing container. As a result, the plasma processing device including the ion source becomes large as a whole.
- FIG. 1 is a diagram schematically showing a plasma processing apparatus according to an embodiment.
- FIG. 1 schematically shows a structure in a vertical cross section of the plasma processing apparatus 10 according to the embodiment.
- the plasma processing device 10 shown in FIG. 1 is a capacitively coupled plasma processing device.
- the plasma processing apparatus 10 includes a processing container 12.
- the processing container 12 has a substantially tubular shape and extends in the vertical direction.
- the processing container 12 has a substantially cylindrical side wall portion and a continuous bottom portion at the lower end of the side wall portion.
- the processing container 12 provides an internal space 12s.
- the processing container 12 is made of a metal such as aluminum.
- a plasma-resistant coating is formed on the inner wall surface of the processing container 12.
- the plasma-resistant coating may be a ceramic film such as an alumite film or an yttrium oxide film.
- the processing container 12 is grounded.
- a passage 12p for carrying in and out a substrate W such as a semiconductor wafer is formed on the side wall portion of the processing container 12.
- the substrate W passes through the passage 12p when it is transported from the outside of the processing container 12 to the internal space 12s and when it is transported from the internal space 12s to the outside of the processing container 12.
- the passage 12p can be opened and closed by the gate valve 12g.
- the gate valve 12g is provided along the side wall portion of the processing container 12.
- a support base 14 is provided in the internal space 12s of the processing container 12.
- the support base 14 is capable of mounting the substrate W on the upper surface thereof, and supports the mounted substrate W.
- the support base 14 is supported by the support body 15.
- the support 15 has an insulating property and extends upward from the bottom of the processing container 12.
- the support base 14 includes the lower electrode 16.
- the lower electrode 16 has a substantially disk shape.
- the lower electrode 16 is made of a conductive material such as aluminum.
- the support 14 further includes an electrostatic chuck 18.
- the electrostatic chuck 18 is provided on the lower electrode 16.
- the substrate W is placed on the electrostatic chuck 18.
- the electrostatic chuck 18 includes a dielectric film and electrodes built in the dielectric film.
- the electrode of the electrostatic chuck 18 can be a film having conductivity.
- a power supply is connected to the electrodes of the electrostatic chuck 18 via a switch. When a voltage is applied to the electrodes of the electrostatic chuck 18 from the power source, an electrostatic attractive force is generated between the electrostatic chuck 18 and the substrate W.
- the substrate W is attracted to the electrostatic chuck 18 by the generated electrostatic attraction and is held by the electrostatic chuck 18.
- the temperature of the support base 14 can be controlled.
- the support base 14 is provided with a temperature control mechanism such as a heater (not shown) inside the lower electrode 16 or the electrostatic chuck 18, and controls the temperature of the mounting surface of the electrostatic chuck 18 on which the substrate W is mounted. Is possible.
- the substrate W is heated by the support base 14.
- a shower head 20 is provided above the support base 14. A part of the internal space 12s is interposed between the shower head 20 and the support base 14. In one embodiment, the upper end of the processing container 12 is open. The shower head 20 is supported by the upper end portion of the processing container 12 via the member 21. The member 21 has an insulating property. The shower head 20 together with the member 21 closes the opening at the upper end of the processing container 12.
- the shower head 20 is formed of one or more conductive parts and has a function as an upper electrode with respect to the lower electrode 16.
- One or more components constituting the shower head 20 may be formed of a material such as aluminum or silicon.
- the shower head 20 may be formed of one or more conductive components and one or more insulating components.
- a plasma resistant film may be formed on the surface of the shower head 20.
- the shower head 20 is formed with a plurality of gas discharge holes 20a and a gas diffusion chamber 20b.
- the plurality of gas discharge holes 20a extend downward from the gas diffusion chamber 20b to the lower surface of the shower head 20 on the internal space 12s side.
- a gas supply unit 22 is connected to the gas diffusion chamber 20b.
- the gas supply unit 22 supplies, for example, various processing gases used for film formation or the like to the gas diffusion chamber 20b.
- the gas supply unit 22 has a plurality of gas sources, a plurality of flow rate controllers such as a mass flow controller, and a plurality of valves.
- Each of the plurality of gas sources is connected to the gas diffusion chamber 20b via the corresponding flow rate controller among the plurality of flow rate controllers and the corresponding valve among the plurality of valves.
- the gas supply unit 22 adjusts the flow rate of the processing gas from the gas source selected from the plurality of gas sources, and supplies the processing gas to the gas diffusion chamber 20b.
- the processing gas supplied to the gas diffusion chamber 20b is supplied to the internal space 12s from the plurality of gas discharge holes 20a.
- An exhaust device 24 is connected to the bottom of the processing container 12.
- the exhaust device 24 is provided so as to be able to communicate with the internal space 12s.
- the exhaust device 24 has a pressure control device such as a pressure regulating valve, and a vacuum pump such as a turbo molecular pump and a dry pump.
- a pressure control device such as a pressure regulating valve
- a vacuum pump such as a turbo molecular pump and a dry pump.
- a high frequency power supply 29 is connected to the shower head 20 via a matching circuit 28.
- the high frequency power supply 29 When the high frequency power supply 29 generates plasma, high frequency power of a predetermined frequency is applied to the shower head 20 as an upper electrode.
- the frequency of the high frequency power used for plasma generation is a low excitation frequency of 450 KHz.
- the frequency of the high frequency power used for plasma generation is not limited to 450 KHz, and a frequency in the range of 300 kHz to 5 MHz can be used.
- the high frequency power supply 29 is an example of a plasma generation unit.
- the plasma processing apparatus 10 will be described as an example in which high frequency power is applied to the shower head 20 as the upper electrode to discharge the plasma, but the present invention is not limited to this.
- high frequency power may be applied to the lower electrode 16.
- the plasma processing apparatus 10 may connect a high frequency power supply to the lower electrode 16 via a matching device and apply high frequency power of a predetermined frequency from the high frequency power supply to the lower electrode 16. Further, in the case of plasma discharge, high frequency power may be applied to the shower head 20 and the lower electrode 16, respectively.
- a focusing unit 110 and a sorting unit 120 are arranged in the processing container 12.
- the focusing unit 110 is arranged in the plasma generation region below the shower head 20.
- the plasma generation region is a region forming the upper part of the internal space 12s of the processing container 12, and is a region in which plasma is generated by applying high frequency energy to the processing gas located below the shower head 20. ..
- the focusing unit 110 extracts a plurality of ions in the plasma generated in the plasma generation region, focuses the extracted plurality of ions, and outputs the extracted ions as an ion beam.
- the energy of the output ion beam is variable.
- the sorting unit 120 is arranged between the focusing unit 110 and the support base 14 (that is, the substrate W on the support base 14).
- the sorting unit 120 sorts specific ions supplied to the substrate W on the support base 14 from the ion beam output from the focusing unit 110.
- the specific ion is an ion having uniform energy and high chemical reactivity. Examples of specific ions include negative ions of oxygen and negative ions of hydrogen. Negative ions of oxygen are also called “oxygen anion radicals”. Negative ions of hydrogen are also called “hydrides”.
- a plurality of ions in the plasma generated in the processing container 12 are focused by the focusing unit 110 to form an ion beam, and then are incident on the sorting unit 120. Then, specific ions are sorted from the ion beam by the sorting unit 120 and supplied to the substrate W on the support base 14. Therefore, for example, the particles supplied to the substrate W are limited to specific ions having uniform energy and high chemical reactivity, and particles other than the specific ions are suppressed from reaching the substrate W. .. As a result, damage to the substrate W can be reduced.
- the focusing unit 110 and the sorting unit 120 are arranged in the processing container 12, parts such as a plasma generation source and a pipe provided with an electromagnet for selecting specific ions are provided outside the processing container 12. No need to place. Therefore, the space occupied by the parts outside the processing container 12 can be reduced, and as a result, the plasma processing apparatus 10 can be downsized.
- the operation of the plasma processing apparatus 10 configured as described above is collectively controlled by the control unit 30.
- the control unit 30 is, for example, a computer, and includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an auxiliary storage device, and the like.
- the CPU operates based on the program stored in the ROM or the auxiliary storage device and the process conditions for film formation, and controls the operation of the entire device.
- the control unit 30 starts and stops the supply of each gas, controls the flow rate of each gas, controls the loading and unloading of the substrate W, controls the temperature of a heater (not shown) of the support base 14, and controls the pressure in the processing container 12. Control, supply of high frequency power from high frequency power supply 29, and stop of supply are controlled.
- the computer-readable program required for control may be stored in the storage medium.
- the storage medium includes, for example, a flexible disk, a CD (Compact Disc), a CD-ROM, a hard disk, a flash memory, a DVD, or the like.
- the control unit 30 may be provided inside the plasma processing device 10 or may be provided outside. When the control unit 30 is provided externally, the control unit 30 can control the plasma processing device 10 by a communication means such as wired or wireless.
- FIG. 2 is a schematic cross-sectional view showing the configuration of the focusing section and the sorting section according to the embodiment.
- the focusing unit 110 is arranged in the plasma generation region below the shower head 20, and focuses a plurality of ions in the plasma generated in the plasma generation region to output an ion beam.
- the focusing unit 110 has electrodes 111a and 111b and an Einzel lens 112.
- the electrodes 111a and 111b are arranged so as to face each other.
- a through hole is formed in the central portion of each of the electrodes 111a and 111b.
- a potential difference is applied to the electrodes 111a and 111b.
- the electrodes 111a and 111b draw a plurality of ions in the plasma into the through hole, and accelerate the plurality of drawn ions based on the potential difference.
- the Einzel lens 112 focuses a plurality of accelerated ions based on an electromagnetic field.
- the Einzel lens 112 has lens elements 113 to 115 arranged side by side along the traveling direction of the accelerated plurality of ions. Cylindrical openings 113a to 115a through which a plurality of ions can pass are formed in the lens elements 113 to 115, respectively.
- the lens elements 113 to 115 are arranged side by side so that the openings 113a to 115a partially overlap along the traveling direction of the plurality of ions from the viewpoint of downsizing the Einzel lens 112.
- the lens elements 113 to 115 generate an electromagnetic field when the lens elements 113 and 115 located on both sides of the lens element 114 are grounded and a positive voltage is applied to the lens element 114.
- the Einzel lens 112 is obtained by attracting a plurality of accelerated ions into the openings 113a to 115a of the lens elements 113 to 115 and applying an electromagnetic force due to an electromagnetic field to the attracted plurality of ions to focus the plurality of ions. Outputs an ion beam.
- the traveling directions of a plurality of ions output from the focusing unit 110 as an ion beam are indicated by arrows AR1.
- the sorting unit 120 is arranged between the focusing unit 110 and the support base 14 (that is, the substrate W on the support base 14), and specific ions supplied from the ion beam output from the focusing unit 110 to the substrate W. To sort out.
- the sorting unit 120 has a pair of magnets 121a (only one magnet 121a is shown in FIG. 2), a pair of magnets 121b (only one magnet 121b is shown in FIG. 2), and a blocking member 122.
- the pair of magnets 121a are provided at positions sandwiching the ion beam output from the focusing unit 110, and generate a magnetic field that changes the traveling direction of a specific ion among a plurality of ions contained in the ion beam.
- the pair of magnets 121b are provided at positions sandwiching the ion beam output from the focusing unit 110, and generate a magnetic field that further changes the traveling direction of a specific ion, which is changed by the magnetic field of the pair of magnets 121a.
- the pair of magnets 121a and the pair of magnets 121b are appropriately referred to as "two pairs of magnets 121".
- FIG. 3 is a diagram showing an example of the arrangement of two pairs of magnets 121 according to the embodiment.
- FIG. 3 shows a view of the Einzel lens 112 of the focusing unit 110 as viewed from below, and shows the arrangement position where the magnets 121a and 121b are provided.
- Each lens element (lens element 113 to 115) of the Einzel lens 112 has a disk shape.
- FIG. 3 shows the lens element 115 located at the lowest position among the lens elements 113 to 115.
- a cylindrical opening 115a is formed at the center of the lens element 115.
- the pair of magnets 121a are provided at positions sandwiching the center position of the lens element 115 (that is, the position of the opening 115a).
- the pair of magnets 121b are positions that sandwich the center position of the lens element 115 (that is, the position of the opening 115a), and are laterally displaced from the pair of magnets 121a along the lower surface of the lens element 115. It is provided in.
- the arrangement positions of the magnets 121a and 121b shown in FIG. 3 correspond to the positions where the ion beam output from the focusing unit 110 is sandwiched.
- the pair of magnets 121a and the pair of magnets 121b are each formed in a disk shape and have different diameters.
- the pair of magnets 121a and the pair of magnets 121b generate magnetic fields in opposite directions to each other.
- the pair of magnets 121a generate a magnetic field from the back side to the front side in FIG. 2
- the pair of magnets 121b generate a magnetic field from the front side to the back side in FIG.
- the strength of the magnetic field generated in the pair of magnets 121a and the strength of the magnetic field generated in the pair of magnets 121b are set according to the shape and diameter of the pair of magnets 121a and the pair of magnets 121b.
- a specific ion contained in the ion beam output from the focusing unit 110 is applied with a force in a direction away from the traveling direction of the ion beam (direction of arrow AR1) by the magnetic field generated in the pair of magnets 121a, and the pair of magnets. Proceed towards 121b. Specific ions traveling toward the pair of magnets 121b are applied with a force in a direction approaching the traveling direction of the ion beam (direction of arrow AR1) by the magnetic field generated in the pair of magnets 121b, and the substrate on the support base 14 is applied. Proceed toward W. In FIG. 2, the traveling direction of a specific ion is indicated by the arrow AR2 branching from the arrow AR1.
- each of the pair of magnets 121a and the pair of magnets 121b shown in FIG. 2 are merely examples, and are not limited thereto, and the strength of the magnetic field required for selecting specific ions. It may be changed according to.
- each of the pair of magnets 121a and the pair of magnets 121b may be formed in a shape other than the disk shape. Further, the pair of magnets 121a and the pair of magnets 121b may have the same size.
- a permanent magnet may be used, or an electromagnet including a coil may be used.
- the blocking member 122 is arranged below the two pairs of magnets 121, passes specific ions whose traveling direction is changed by the magnetic field of the two pairs of magnets 121, and blocks other ions other than the specific ions.
- the blocking member 122 is formed in a plate shape and has a hole 122a through which a specific ion can pass. Specific ions whose traveling direction is changed to the direction of arrow AR2 by the magnetic field of the two pairs of magnets 121 pass through the holes 122a and are supplied to the substrate W. On the other hand, other ions whose traveling direction is not changed by the magnetic field of the two pairs of magnets 121 travel in the direction of the arrow AR1 as an ion beam and are absorbed by the plate surface of the blocking member 122.
- variable DC power supply 123 is connected to the cutoff member 122 and the support base 14.
- the variable DC power supply 123 decelerates specific ions supplied to the substrate W through the hole 122a of the breaking member 122 by applying a potential difference to the breaking member 122 and the support base 14. By decelerating specific ions supplied to the substrate W, damage to the substrate W due to collision with high-speed ions is reduced.
- a plurality of sets of the focusing unit 110 and the two pairs of magnets 121 are arranged.
- the focusing portions 110 and two are arranged in a 3 ⁇ 3 matrix above the support base 14 (that is, the substrate W on the support base 14) in the processing container 12 along the upper surface of the support base 14.
- Nine sets of pairs of magnets 121 are arranged.
- FIG. 2 shows three sets of nine focusing portions 110 and two pairs of magnets 121.
- the arrangement position of the set of the focusing portion 110 and the pair of magnets 121 shown in FIG. 2 is an example, and is not limited thereto.
- a plurality of sets of the focusing portion 110 and the two pairs of magnets 121 may be arranged in a plurality of concentric circles having different radii around the central axis of the support base 14.
- the blocking member 122 has a hole 122a through which a specific ion can pass at a position corresponding to each set of the focusing portion 110 and the two pairs of magnets 121.
- the blocking member 122 since nine sets of the focusing portion 110 and the two pairs of magnets 121 are arranged, the blocking member 122 has nine holes 122a corresponding to the positions of the nine sets.
- the plasma processing apparatus 10 includes a processing container 12, a high frequency power supply 29 (plasma generation unit), a focusing unit 110, and a sorting unit 120.
- the substrate W targeted for plasma processing is arranged inside.
- the high frequency power supply 29 generates plasma in the processing container 12.
- the focusing unit 110 is arranged in the processing container 12 and focuses a plurality of ions in the plasma to output an ion beam.
- the sorting unit 120 sorts specific ions supplied to the substrate W from the ion beam output from the focusing unit 110.
- the plasma processing apparatus 10 can limit the particles supplied to the substrate W to, for example, specific ions having low energy and high chemical reactivity, thereby reducing damage to the substrate W. Can be done.
- the plasma processing apparatus 10 arranges the focusing unit 110 and the sorting unit 120 inside the processing container 12, the space occupied by the parts can be reduced outside the processing container 12, and the device can be downsized. can.
- the focusing unit 110 has electrodes 111a and 111b (a plurality of electrodes) and an Einzel lens 112.
- the electrodes 111a and 111b accelerate a plurality of ions in the plasma based on the potential difference.
- the Einzel lens 112 focuses the accelerated ions on the basis of an electromagnetic field. As a result, the plasma processing apparatus 10 can efficiently obtain an ion beam by focusing only ions which are charged particles.
- the sorting unit 120 has two pairs of magnets 121 and a blocking member 122.
- the pair of magnets 121 are provided at positions sandwiching the ion beam output from the focusing unit 110, and generate a magnetic field that changes the traveling direction of a specific ion among a plurality of ions contained in the ion beam.
- the blocking member 122 passes a specific ion whose traveling direction is changed by the magnetic field of the pair of magnets 121, and blocks other ions other than the specific ion.
- the plasma processing apparatus 10 can supply specific ions to the substrate W with high purity without causing ions other than the specific ions to reach the substrate W, and as a result, other ions other than the specific ions. It is possible to reduce the damage to the substrate W caused by the ions of.
- the plasma processing apparatus 10 a plurality of sets of the focusing unit 110 and the two pairs of magnets 121 are arranged above the substrate W in the processing container 12.
- the blocking member 122 has a hole 122a through which a specific ion can pass at a position corresponding to each set of the focusing portion 110 and the two pairs of magnets 121.
- the above-mentioned plasma processing device 10 is a capacitive coupling type plasma processing device, but can be applied to any plasma processing device.
- the plasma processing apparatus 10 may be any type of plasma processing apparatus, such as an inductively coupled plasma processing apparatus or a plasma processing apparatus that excites a gas by a surface wave such as a microwave.
- the plasma processing apparatus 10 has been described as an example in which the traveling direction of a specific ion is changed by using two pairs of magnets 121 (a pair of magnets 121a and a pair of magnets 121b).
- the disclosed technology is not limited to this.
- the pair of magnets 121b may be omitted, and only the pair of magnets 121a may be used to change the traveling direction of a specific ion.
- the focusing portion 110 is diagonally arranged so that the ion beam is obliquely incident on the pair of magnets 121a, and the traveling direction of the specific ion contained in the ion beam is directed toward the substrate W by the magnetic field of the pair of magnets 121a. change.
- three or more pairs of magnets may be used to change the traveling direction of a specific ion. In short, at least a pair of magnets may be used to change the traveling direction of a specific ion.
- the case of using the Einzel lens 112 in which three lens elements (lens elements 113 to 115) are arranged side by side has been described as an example, but the number of lens elements included in the Einzel lens 112 is three. Not limited to one.
- an Einzel lens may be formed by arranging an odd number of lens elements of 5 or more.
- Plasma processing device 12 Processing container 29 High frequency power supply 110 Focusing unit 111a, 111b Electrode 112 Einzel lens 120 Sorting unit 121, 121a, 121b Magnet 122 Blocking member 122a Hole
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Abstract
Description
最初に、実施形態に係るプラズマ処理装置10の構成について説明する。図1は、実施形態に係るプラズマ処理装置を概略的に示す図である。図1には、実施形態に係るプラズマ処理装置10の縦断面における構造が概略的に示されている。図1に示すプラズマ処理装置10は、容量結合型のプラズマ処理装置である。プラズマ処理装置10は、処理容器12を備えている。処理容器12は、略筒形状を有しており、鉛直方向に延在している。処理容器12は、略筒状の側壁部、及び、側壁部の下端に連続する底部を有している。処理容器12は、内部空間12sを提供している。処理容器12は、アルミニウムといった金属から形成されている。処理容器12の内壁面には耐プラズマ性を有する被覆が形成されている。耐プラズマ性を有する被覆は、アルマイト膜、酸化イットリウム膜といったセラミックス製の膜であり得る。処理容器12は、接地されている。
次に、図2を参照して、集束部110及び選別部120の構成についてさらに説明する。図2は、実施形態に係る集束部及び選別部の構成を示す概略断面図である。
以上のように、実施形態に係るプラズマ処理装置10は、処理容器12と、高周波電源29(プラズマ生成部)と、集束部110と、選別部120とを有する。処理容器12は、プラズマ処理の対象とされた基板Wが内部に配置される。高周波電源29は、処理容器12内にプラズマを生成する。集束部110は、処理容器12内に配置され、プラズマ中の複数のイオンを集束してイオンビームを出力する。選別部120は、集束部110から出力されるイオンビームから、基板Wへ供給される特定のイオンを選別する。これにより、プラズマ処理装置10は、基板Wへ供給される粒子を、例えば、低エネルギーであり且つ化学反応性の高い特定のイオンに限定することができるため、基板Wへのダメージを低減することができる。また、プラズマ処理装置10は、処理容器12内に集束部110及び選別部120を配置するため、処理容器12の外部において部品による占有スペースを削減することができ、装置の小型化を図ることができる。
12 処理容器
29 高周波電源
110 集束部
111a、111b 電極
112 アインツェルレンズ
120 選別部
121、121a、121b 磁石
122 遮断部材
122a 孔
Claims (4)
- プラズマ処理の対象とされた基板が内部に配置された処理容器と、
前記処理容器内にプラズマを生成するプラズマ生成部と、
前記処理容器内に配置され、前記プラズマ中の複数のイオンを集束してイオンビームを出力する集束部と、
前記集束部から出力される前記イオンビームから、前記基板へ供給される特定のイオンを選別する選別部と
を有する、プラズマ処理装置。 - 前記集束部は、
前記プラズマ中の複数のイオンを電位差に基づき加速させる複数の電極と、
加速された前記複数のイオンを電磁場に基づき集束するアインツェルレンズと
を有する、請求項1に記載のプラズマ処理装置。 - 前記選別部は、
前記集束部から出力される前記イオンビームを挟む位置に設けられ、前記イオンビームに含まれる複数のイオンのうち前記特定のイオンの進行方向を変更する磁場を発生する、少なくとも一対の磁石と、
前記少なくとも一対の磁石の磁場によって進行方向が変更された前記特定のイオンを通過させ、前記特定のイオン以外の他のイオンを遮断する遮断部材と
を有する、請求項1又は2に記載のプラズマ処理装置。 - 前記集束部及び前記少なくとも一対の磁石の組みが、前記処理容器内の前記基板よりも上方に複数配置され、
前記遮断部材は、前記集束部及び前記少なくとも一対の磁石の各組みに対応する位置に、前記特定のイオンが通過可能な孔を有する、請求項3に記載のプラズマ処理装置。
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Citations (6)
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JP2001028342A (ja) * | 1999-07-15 | 2001-01-30 | Hitachi Ltd | 薄膜形成方法および液晶表示装置 |
US20030127049A1 (en) * | 2002-01-08 | 2003-07-10 | Applied Materials, Inc. | Process chamber having component with yttrium-aluminum coating |
JP2003257348A (ja) * | 2002-03-05 | 2003-09-12 | Sumitomo Eaton Noba Kk | イオンビームの質量分離フィルタとその質量分離方法及びこれを使用するイオン源 |
JP2007073534A (ja) * | 1996-05-15 | 2007-03-22 | Semiconductor Energy Lab Co Ltd | ドーピング処理装置 |
JP2009253250A (ja) * | 2008-04-11 | 2009-10-29 | Japan Aviation Electronics Industry Ltd | 固体表面の加工方法及びその装置 |
JP2012004012A (ja) * | 2010-06-18 | 2012-01-05 | Nachi Fujikoshi Corp | ガスクラスターイオンビーム装置 |
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KR20210019488A (ko) | 2018-06-14 | 2021-02-22 | 고쿠리츠 다이가쿠 호우진 교토 코우게이 센이 다이가쿠 | 특정종 이온원 및 플라즈마 성막 장치 |
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- 2021-10-19 JP JP2022559029A patent/JPWO2022091860A1/ja active Pending
- 2021-10-19 KR KR1020237018249A patent/KR20230098298A/ko unknown
- 2021-10-19 WO PCT/JP2021/038547 patent/WO2022091860A1/ja active Application Filing
- 2021-10-26 TW TW110139592A patent/TW202223959A/zh unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007073534A (ja) * | 1996-05-15 | 2007-03-22 | Semiconductor Energy Lab Co Ltd | ドーピング処理装置 |
JP2001028342A (ja) * | 1999-07-15 | 2001-01-30 | Hitachi Ltd | 薄膜形成方法および液晶表示装置 |
US20030127049A1 (en) * | 2002-01-08 | 2003-07-10 | Applied Materials, Inc. | Process chamber having component with yttrium-aluminum coating |
JP2003257348A (ja) * | 2002-03-05 | 2003-09-12 | Sumitomo Eaton Noba Kk | イオンビームの質量分離フィルタとその質量分離方法及びこれを使用するイオン源 |
JP2009253250A (ja) * | 2008-04-11 | 2009-10-29 | Japan Aviation Electronics Industry Ltd | 固体表面の加工方法及びその装置 |
JP2012004012A (ja) * | 2010-06-18 | 2012-01-05 | Nachi Fujikoshi Corp | ガスクラスターイオンビーム装置 |
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KR20230098298A (ko) | 2023-07-03 |
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