WO2016009781A1 - プラズマ処理装置 - Google Patents
プラズマ処理装置 Download PDFInfo
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- WO2016009781A1 WO2016009781A1 PCT/JP2015/067688 JP2015067688W WO2016009781A1 WO 2016009781 A1 WO2016009781 A1 WO 2016009781A1 JP 2015067688 W JP2015067688 W JP 2015067688W WO 2016009781 A1 WO2016009781 A1 WO 2016009781A1
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- support shaft
- processing
- processing container
- microwave
- substrate
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
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- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
Definitions
- the present invention relates to a plasma processing apparatus for processing a target object by converting a processing gas supplied into a processing container into a plasma by using a microwave.
- a plasma processing apparatus that performs predetermined plasma processing on an object to be processed such as a semiconductor wafer (hereinafter referred to as “wafer”)
- a plasma processing apparatus that generates plasma by irradiating microwaves into a processing container
- high-density plasma having a low electron temperature can be generated in a processing container, and for example, a film forming process or an etching process is performed by the generated plasma.
- the plasma processing apparatus includes, for example, a mounting table provided in the processing container, a heating mechanism that heats the mounting table, an exhaust mechanism that exhausts the processing container, a microwave supply unit that irradiates microwaves into the processing container, A gas supply unit for supplying the processing gas is provided.
- a baffle plate having a large number of exhaust holes is arranged around the mounting table in order to uniformize the flow of the processing gas in the processing container, or uniform plasma processing is performed.
- a focus ring for converging plasma on the wafer is arranged near the outer periphery of the wafer.
- the intensity distribution of the irradiated microwaves changes due to slight protrusions or depressions on the microwave propagation path, or assembly errors in the microwave supply section. End up. For this reason, it is extremely difficult to ensure the uniformity of the intensity distribution particularly in the circumferential direction of the wafer.
- the adjustment using the baffle plate or the focus ring described above has a limit in suppressing such variation in the intensity distribution of the microwave.
- the present invention has been made in view of such points, and in a microwave plasma processing apparatus, even when there is a variation in the intensity distribution of the microwave, particularly in the circumferential direction of the wafer, in-plane uniform wafer processing is performed. It is an object.
- the present invention provides a plasma processing apparatus for processing a substrate with microwave plasma, a processing container for hermetically storing the substrate, and a microwave supply for irradiating the processing container with microwaves
- a processing gas supply unit that supplies a processing gas into the processing container, a substrate holding mechanism that holds the substrate in the processing container, and a bottom surface of the substrate holding mechanism that vertically penetrates the bottom surface of the processing container.
- a support shaft that supports the rotating shaft, a rotation drive mechanism that rotates the support shaft, and a magnetic fluid seal that hermetically seals between the support shaft and the processing container; and the magnetic fluid seal And a choke mechanism that prevents the magnetic fluid seal from being heated by leakage of microwaves from between the support shaft and the processing container.
- the inventor has tried to equalize the microwaves irradiated into the processing container, and to uniformize the flow of processing gas in the processing container using a baffle plate or the like.
- the idea that it is also effective to actively rotate the substrate in the processing container and average the dispersion of the intensity distribution of the microwaves is obtained.
- the present invention is based on this idea, and the substrate held by the substrate holding mechanism can be rotated during the plasma processing by rotating the support shaft that supports the substrate holding mechanism by the rotation driving mechanism. Therefore, even when there is variation in the intensity distribution of the microwaves irradiated into the processing container, in-plane uniform substrate processing can be performed.
- a rotational drive mechanism such as a motor needs to be arranged outside the processing container. For this reason, it is necessary to provide the support shaft that supports the substrate holding mechanism through the processing container. In this case, there are problems such as maintaining the hermeticity of the processing container and leakage of microwaves between the support shaft and the processing container.
- a magnetic fluid seal that hermetically seals between the support shaft and the processing container, and a choke mechanism that prevents leakage of microwaves from between the support shaft and the processing container. Therefore, the inside of the processing container can be maintained in a vacuum, and microwave leakage to the outside of the processing container can be minimized.
- the choke mechanism is provided above the magnetic fluid seal, it is possible to prevent the magnetic fluid seal from being heated by leakage of microwaves, for example, exceeding the heat resistance temperature of the magnetic fluid seal. Therefore, the inside of the processing container can be reliably kept airtight.
- the microwave plasma processing apparatus even when there is a variation in the intensity distribution of the microwave particularly in the circumferential direction of the wafer, it is possible to perform in-plane uniform wafer processing.
- FIG. 1 is a longitudinal sectional view showing an outline of a configuration of a plasma processing apparatus 1 according to the present embodiment.
- the plasma processing apparatus 1 performs a plasma CVD (Chemical Vapor Deposition) process on the surface of the wafer W to form, for example, a SiN film (silicon nitride film) on the surface of the wafer W.
- a plasma CVD Chemical Vapor Deposition
- SiN film silicon nitride film
- the plasma processing apparatus 1 has a processing container 2 that keeps the inside airtight, and a microwave supply unit 3 that irradiates the processing container 2 with microwaves.
- the processing container 2 has a substantially cylindrical main body 2a whose upper surface is open and a substantially disc-shaped lid 2b that hermetically closes the opening of the main body 2a.
- the main body 2a and the lid 2b are made of a metal such as aluminum, for example.
- the main body 2a is grounded by a ground wire (not shown).
- a susceptor 10 as a substrate holding mechanism for holding the wafer W is provided.
- the susceptor 10 has a disk shape, for example, and is made of a metal such as aluminum.
- a high frequency power supply 12 for bias is connected to the susceptor 10 via a slip ring 100 which will be described later.
- the high frequency power source 12 outputs a certain frequency suitable for controlling the energy of ions drawn into the wafer W, for example, a high frequency of 13.56 MHz.
- the susceptor 10 is provided with an electrostatic chuck for electrostatically attracting the wafer W, and the wafer W can be electrostatically attracted onto the susceptor 10.
- a heater 13 is provided inside the susceptor 10 to heat the wafer W to a predetermined temperature. Supply of electric power to the heater 13 is also performed via a slip ring 100 described later.
- lift pins 14 are provided for supporting the wafer W from below and lifting it.
- the elevating pin 14 is formed longer than the thickness of the susceptor 10 so as to be inserted through a through hole 10a penetrating the susceptor 10 in the vertical direction and movable with respect to the susceptor 10 and protruding from the upper surface of the susceptor 10. Yes.
- a lift arm 15 that presses the lift pin 14 upward is provided below the lift pin 14.
- the lift arm 15 is configured to be movable up and down by a lifting mechanism 16.
- the lift pins 14 are not connected to the lift arm 15, and when the lift arms 15 are lowered, the lift pins 14 and the lift arms 15 are separated from each other.
- the upper end portion 14a of the elevating pin 14 has a larger diameter than the through hole 10a. Therefore, the lifting pins 14 are locked to the susceptor 10 without falling off the through holes 10a even when the lift arm 15 is retracted downward.
- a recess 10b having a diameter and thickness larger than that of the upper end portion 14a of the elevating pin 14 is formed at the upper end of the through hole 10a.
- An annular focus ring 17 is provided on the upper surface of the susceptor 10 so as to surround the wafer W.
- the focus ring 17 is made of an insulating material such as ceramic or quartz.
- the plasma generated in the processing container 2 converges on the wafer W by the action of the focus ring 17, thereby improving the uniformity of plasma processing in the wafer W surface.
- the susceptor 10 is supported at the center of the lower surface thereof by a support shaft 20 having a cylindrical shape with a hollow center, for example.
- the support shaft 20 extends vertically downward and is provided so as to penetrate the bottom surface of the main body 2a of the processing container 2 in the vertical direction.
- the support shaft 20 has an upper shaft 20a that comes into contact with the susceptor 10 and a lower shaft 20b that is connected to the upper shaft 20a via a flange 21 provided at the lower end of the upper shaft 20a.
- the upper shaft 20a and the lower shaft 20b are formed of an insulating member, for example.
- the exhaust chamber 30 is formed at the bottom of the main body 2a of the processing container 2 so as to protrude to the side of the main body 2a, for example.
- An exhaust mechanism 31 that exhausts the inside of the processing container 2 is connected to the bottom surface of the exhaust chamber 30 via an exhaust pipe 32.
- the exhaust pipe 32 is provided with an adjustment valve 33 that adjusts the amount of exhaust by the exhaust mechanism 31.
- An annular baffle plate 34 is provided above the exhaust chamber 30 and below the susceptor 10 to uniformly exhaust the inside of the processing container 2 with a predetermined gap from the outer surface of the support shaft 20. ing. In the baffle plate 34, an opening (not shown) penetrating the baffle plate 34 in the thickness direction is formed over the entire circumference.
- a rotary seal that seals the space between the support shaft 20 and the main body 2a at the lower end of the bottom of the main body 2a of the processing container 2, that is, outside the processing container 2, and rotates the support shaft 20 about the vertical axis.
- a mechanism 35 is provided. Details of the rotary seal mechanism 35 will be described later.
- the microwave supply part 3 which supplies the microwave for plasma generation is provided in the ceiling surface opening part of the processing container 2.
- the microwave supply unit 3 includes a radial line slot antenna 40 (radial line slot antenna).
- the radial line slot antenna 40 includes a microwave transmission plate 41, a slot plate 42, and a slow wave plate 43.
- the microwave transmission plate 41, the slot plate 42, and the slow wave plate 43 are stacked in this order from the bottom, and are provided in the opening of the main body 2a of the processing container 2.
- the upper surface of the slow wave plate 43 is covered with the lid 2b.
- the radial line slot antenna 40 is disposed at a position where the center thereof substantially coincides with the rotation center of the support shaft 20.
- the microwave transmitting plate 41 and the main body 2a are kept airtight by a sealing material (not shown) such as an O-ring.
- the microwave transmitting plate 41 is made of a dielectric material such as quartz, Al 2 O 3 , AlN, or the like, and the microwave transmitting plate 41 transmits microwaves.
- a plurality of slots are formed in the slot plate 42 provided on the upper surface of the microwave transmission plate 41, and the slot plate 42 functions as an antenna.
- the slot plate 42 is made of a conductive material such as copper, aluminum, or nickel.
- the slow wave plate 43 provided on the upper surface of the slot plate 42 is made of a low loss dielectric material, for example, quartz, Al 2 O 3 , AlN, or the like, and shortens the wavelength of the microwave.
- the lid body 2b that covers the upper surface of the slow wave plate 43 is provided with a plurality of annular passages 45 through which, for example, a cooling medium flows.
- the lid 2b, the microwave transmission plate 41, the slot plate 42, and the slow wave plate 43 are adjusted to a predetermined temperature by the cooling medium flowing through the flow path 45.
- a coaxial waveguide 50 is connected to the center of the lid 2b.
- a microwave generation source 53 is connected to the upper end portion of the coaxial waveguide 50 via a rectangular waveguide 51 and a mode converter 52.
- the microwave generation source 53 is installed outside the processing container 2 and can generate a microwave of 2.45 GHz, for example.
- the coaxial waveguide 50 has an inner conductor 54 and an outer tube 55.
- the inner conductor 54 is connected to the slot plate 42.
- the slot 54 on the side of the inner conductor 54 is formed in a conical shape so that microwaves can be efficiently propagated to the slot plate 42.
- the microwave generated from the microwave generation source 53 sequentially propagates in the rectangular waveguide 51, the mode converter 52, and the coaxial waveguide 50, and is compressed by the slow wave plate 43 to be shortened in wavelength. .
- circularly polarized microwaves are transmitted from the slot plate 42 through the microwave transmission plate 41 and irradiated into the processing container 2.
- the processing gas is converted into plasma in the processing chamber 2 by the microwave, and the plasma processing of the wafer W is performed by the plasma.
- a first processing gas supply pipe 60 is provided at the center of the ceiling surface of the processing vessel 2, that is, at the center of the radial line slot antenna 40.
- the first processing gas supply pipe 60 penetrates the radial line slot antenna 40 in the vertical direction, and one end of the first processing gas supply pipe 60 is opened on the lower surface of the microwave transmission plate 41.
- the first processing gas supply pipe 60 passes through the inner conductor 54 of the coaxial waveguide 50 and further passes through the mode converter 52.
- the other end of the first process gas supply pipe 60 is connected to a first process gas supply source 61.
- the first processing gas supply source 61 is configured to be capable of individually supplying, for example, TSA (trisilylamine), N 2 gas, H 2 gas, and Ar gas as processing gases.
- TSA, N 2 gas, and H 2 gas are raw material gases for forming the SiN film
- Ar gas is a plasma excitation gas.
- this processing gas may be referred to as a “first processing gas”.
- the first processing gas supply pipe 60 is provided with a supply device group 62 including a valve for controlling the flow of the first processing gas, a flow rate adjusting unit, and the like.
- the first processing gas supplied from the first processing gas supply source 61 is supplied into the processing container 2 via the first processing gas supply pipe 60 and is directed toward the wafer W placed on the susceptor 10. Flows vertically downward.
- a second processing gas supply pipe 70 is provided on the inner peripheral surface of the upper portion of the processing container 2.
- a plurality of second processing gas supply pipes 70 are provided at equal intervals along the inner peripheral surface of the processing container 2.
- a second processing gas supply source 71 is connected to the second processing gas supply pipe 70. Inside the second processing gas supply source 71, for example, TSA (trisilylamine), N 2 gas, H 2 gas, and Ar gas can be individually supplied as processing gases. In the following, this processing gas may be referred to as a “second processing gas”.
- the second processing gas supply source 71 is provided with a supply device group 72 including a valve for controlling the flow of the second processing gas, a flow rate adjusting unit, and the like.
- the second processing gas supplied from the second processing gas supply source 71 is supplied into the processing container 2 via the second processing gas supply pipe 70, and the outer peripheral portion of the wafer W placed on the susceptor 10. It flows toward.
- the first processing gas from the first processing gas supply pipe 60 is supplied toward the center of the wafer W
- the second processing gas from the second processing gas supply pipe 70 is supplied to the wafer W. Supplied toward the outer periphery.
- the processing gas supplied from the first processing gas supply pipe 60 and the second processing gas supply pipe 70 into the processing container 2 may be the same kind of gas or a different kind of gas. Each can be supplied at an independent flow rate or at an arbitrary flow rate ratio.
- FIG. 2 is a longitudinal sectional view showing an outline of the configuration of the rotary seal mechanism 35.
- the rotary seal mechanism 35 includes a casing 81 that holds the support shaft 20 via a bearing 80, a rotary joint 82 connected to the lower end of the casing, and a rotation drive mechanism 83 that rotates the support shaft 20.
- the casing 81 has an opening 81a whose inner diameter is larger than the outer diameter of the support shaft 20, and the lower shaft 20b of the support shaft 20 is inserted into the opening 81a.
- the upper end portion of the casing 81 is fixed to the bottom portion of the main body portion 2a of the processing container 2 with, for example, a bolt (not shown), and an O-ring (for example) is provided between the upper end portion of the casing 81 and the lower end surface of the main body portion 2a. (Not shown) or the like.
- a choke 84 for preventing microwave leakage from a gap between the lower shaft 20b and the casing 81 is provided in an annular shape on the inner peripheral surface of the upper portion of the casing 81.
- the chalk 84 is formed in a slit shape having a rectangular cross section, for example.
- the length L of the choke 84 is set to a length of about 1 ⁇ 4 of the wavelength of the microwave for the purpose of preventing leakage of the microwave.
- the length L of the choke 84 is not necessarily set to 1 ⁇ 4 of the wavelength of the microwave.
- a magnetic fluid seal 85 is provided as a seal member that hermetically seals between the lower shaft 20b of the support shaft 20 and the casing 81.
- the magnetic fluid seal 85 includes, for example, an annular permanent magnet 85a built in the casing 81, and a magnetic fluid 85b sealed between the permanent magnet 85a and the lower shaft 20b.
- the magnetic fluid seal 85 maintains an airtight space between the support shaft 20 and the processing container 2.
- the bearing 80 is provided below the magnetic fluid seal 85 in the support shaft 20.
- the bearing 80 is supported by the casing 81. Thereby, the support shaft 20 is supported in a rotatable state with respect to the casing 81.
- FIG. 2 only the radial bearing is illustrated, but a thrust bearing that supports a load in the vertical direction may be provided as necessary.
- a rotary joint 82 having an annular shape is connected to the lower end of the casing 81.
- the rotary joint 82 is connected to the lower shaft 20 b via a bearing 86, and the lower shaft 20 b is rotatable with respect to the rotary joint 82.
- a cooling water supply pipe 90 is connected to the side surface of the rotary joint 82, and a cooling water discharge pipe 91 is connected to the cooling water supply pipe 90, for example, below.
- annular grooves 92 and 93 are formed, respectively.
- a cooling water supply path 94 that communicates with the groove 92 and extends vertically upward is formed inside the lower shaft 20b.
- the cooling water supply path 94 extends to the vicinity of the flange 21, and is folded vertically downward from the vicinity of the flange 21 to be connected to the groove 93.
- a cooling water supply source (not shown) is connected to the cooling water supply pipe 90, and the cooling water supplied from the cooling water supply source cools the flange 21 through the cooling water supply pipe 90 and the cooling water supply path 94. Then, it is discharged from the cooling water discharge pipe 91.
- O-rings 95 are provided vertically so as to sandwich the grooves 92 and 93. Thereby, the cooling water is supplied to the cooling water supply path 94 without leaking from between the rotary joint 82 and the lower shaft 20b.
- a cylindrical slip ring 100 is connected to, for example, the lower end surface of the lower shaft 20b.
- a disc-shaped rotating electrode 101 is provided at the center of the lower end surface of the slip ring 100, and an annular rotating electrode 102 is provided outside the rotating electrode 101, for example.
- Conductive wires 110 and 111 for supplying high-frequency power from the high-frequency power source 12 to the susceptor 10 and supplying power to the heater inside the susceptor 10 are electrically connected to the rotating electrodes 101 and 102, respectively.
- the conducting wires 110 and 111 are provided to extend upward along the hollow portion inside the support shaft 20 and are connected to the susceptor 10. When power is supplied to the conducting wires 110 and 111, for example, as shown in FIG.
- a power source is connected to the rotating electrodes 101 and 102 via the brush 103.
- the brush 103 is fixed, for example, by a fixing member (not shown) so that the relative positional relationship with the main body 2a of the processing container 2 does not change.
- FIG. 2 a state in which the matching unit 11 and the high-frequency power source 12 are connected to the rotating electrodes 101 and 102 via the brush 103 is illustrated.
- the arrangement and the number of the rotating electrodes are the same as those in the present embodiment.
- the content is not limited and can be set arbitrarily.
- a power source for supplying power to the heater 13 for example, a power source for applying a voltage to the electrostatic chuck, or a thermocouple built in the susceptor 10 used for temperature control of the heater 13. Etc.
- a shielding member 112 formed in a cylindrical shape surrounding the slip ring 100 is fixed below the rotary joint 82 in the lower shaft 20b.
- the shielding member 112 is formed of an insulating member, for example, so that the contact portion between the slip ring 100 and the brush 103 is not exposed.
- a belt 120 is connected to the outer peripheral portion of the shielding member 112.
- a motor 121 is connected to the belt 120 via a shaft 122. Therefore, by rotating the motor 121, the shielding member 112 is rotated via the shaft 122 and the belt 120, and the support shaft 20 fixed to the shielding member 112 is rotated.
- the shielding member 112, the belt 120, and the motor 121 form a rotational drive mechanism 83 in the present invention.
- the slip ring 100 also rotates, but the electrical connection with the rotating electrodes 101 and 102 is maintained by the brush 103.
- the cooling water supply path 94 formed in the lower shaft 20b is also rotated by the rotation of the support shaft 20, but the cooling water supply pipe 90 and the cooling water discharge pipe are passed through the grooves 92 and 93 formed in the lower shaft 20b. Since the connection with 91 is maintained, the supply of cooling water to the cooling water supply path 94 is maintained even when the support shaft 20 is rotated.
- the rotary joint 82 and the rotation drive mechanism 83 are provided in this order below the casing 81.
- these arrangements and shapes are as follows. It can be set arbitrarily.
- the configuration of the rotation drive mechanism 83 is not limited to the contents of the present embodiment, and the arrangement of the motor 121 and the mechanism for transmitting the driving force of the motor 121 to the support shaft 20 can be arbitrarily set. .
- the plasma processing apparatus 1 according to the present embodiment is configured as described above. Next, plasma processing of the wafer W performed by the plasma processing apparatus 1 according to the present embodiment will be described. In the present embodiment, as described above, the plasma film forming process is performed on the wafer W to form the SiN film on the surface of the wafer W.
- a gate valve (not shown) provided in the processing container 2 is opened, and the wafer W is loaded into the processing container 2.
- the wafer W is transferred to the lift pins 14, and then the lift mechanism 16 is lowered to place the wafer W on the susceptor 10.
- a DC voltage is applied to the electrostatic chuck, and the wafer W is electrostatically attracted onto the susceptor 10 by the Coulomb force.
- the susceptor 10 is rotated via the support shaft 20 by rotating the motor 121.
- the lifting pins 14 are provided separately from the lift arm 15, the lifting pins 14 rotate together with the susceptor 10.
- the first processing gas is supplied from the first processing gas supply pipe 60 into the processing container 2, and the second processing gas is supplied from the second processing gas supply pipe 70 into the processing container 2.
- the flow rate of Ar gas supplied from the first process gas supply pipe 60 is, for example, 100 sccm (mL / min)
- the flow rate of Ar gas supplied from the second process gas supply pipe 70 is, for example, 750 sccm ( mL / min).
- the first processing gas and the second processing gas are supplied into the processing container 2 and the microwave generation source 53 is operated.
- the microwave generation source 53 for example, a microwave having a predetermined power at a frequency of 2.45 GHz is used. Generate a wave.
- the microwave is irradiated into the processing container 2 through the rectangular waveguide 51, the mode converter 52, the coaxial waveguide 50, and the radial line slot antenna 40.
- the processing gas is turned into plasma in the processing chamber 2 by the microwave, and the dissociation of the processing gas proceeds in the plasma, and a film forming process is performed on the wafer W by radicals (active species) generated at that time.
- the wafer W is rotated in the processing container 2 by rotating the susceptor 10, for example, even if the electric field intensity distribution of the microwave irradiated from the radial line slot antenna 40 is not uniform, the wafer Plasma processing in the W plane can be averaged to perform uniform processing in the plane. Thus, a SiN film is formed on the surface of the wafer W.
- a high frequency of a predetermined power is applied to the susceptor 10 by the high frequency power source 12 at a frequency of 13.56 MHz, for example.
- an RF bias in an appropriate range, ions in plasma are attracted to the wafer W, so that the denseness of the SiN film is improved and traps in the film are increased.
- the electron temperature of the plasma can be kept low by using the microwave plasma, the film is not damaged, and the molecules of the processing gas are easily dissociated by the high-density plasma, thereby promoting the reaction.
- the support shaft 20 that supports the susceptor 10 is rotated by the rotation drive mechanism 83 having the motor 121 and the belt 120, thereby rotating the wafer W held by the susceptor 10 during plasma processing. be able to. Therefore, even when the intensity distribution of the microwaves radiated into the processing container 2 has a variation, it is possible to perform the in-plane uniform wafer processing.
- the rotation drive mechanism 83 needs to be disposed outside the processing container 2 in order to avoid exposure to plasma, and therefore, the support shaft 20 needs to be provided through the processing container 2.
- the support shaft 20 in order to maintain the airtightness of the processing container 2, it is conceivable to provide an O-ring or the like at the sliding portion between the support shaft 20 and the processing container 2, but the sliding between the O-ring and the support shaft 20 may be considered.
- the magnetic fluid 85b as the sealing member as in the present invention, the airtightness between the support shaft 20 and the processing container 2 can be maintained, and further the generation of particles can be suppressed.
- the magnetic fluid 85b easily absorbs microwaves, and when exposed to microwaves, the temperature may rise and exceed the heat-resistant temperature (approximately 150 ° C.). However, as in this embodiment, the magnetic fluid 85b is supported. A choke 84 that prevents leakage of microwaves from between the shaft 20 and the processing container 2 is provided above the magnetic fluid seal 85, thereby suppressing leakage of microwaves from the processing container 2 to the outside and magnetic fluid. Microwaves reaching 85b can be significantly reduced. As a result, the magnetic fluid 85b can be prevented from being heated beyond the heat resistance temperature, and the inside of the processing container 2 can be kept airtight.
- an O-ring or the like is used as a sealing member.
- an O-ring is used instead of the magnetic fluid seal 85 according to allowable particles.
- a ring may be used as a seal member.
- a seal mechanism 130 as another seal member is provided between the choke 84 and the magnetic fluid seal 85 as shown in FIG. Also good.
- the seal mechanism 130 includes, for example, an O-ring 131 provided below the choke 84 and a labyrinth seal 132 provided between the choke 84 and the O-ring 131 to reduce the differential pressure acting on the O-ring 131. is doing.
- the O-ring 131 is not required to have a sealing performance against gas, has high resistance to sliding and friction, and is in the processing container 2. It is preferable to use, for example, PTFE (polytetrafluoroethylene), which has resistance to radicals generated in the above.
- the center of rotation of the support shaft 20 and the center of the radial line slot antenna 40 substantially coincide.
- the center may be eccentric with respect to the center of the radial line slot antenna 40 in plan view.
- the intensity distribution of microwaves varies in the circumferential direction, while the intensity tends to gradually decrease from, for example, the microwave irradiation center toward the outer periphery. That is, the intensity distribution of the microwave changes along the diameter direction of the wafer W. Therefore, for example, as shown in FIG. 3, the rotation center of the support shaft 20 is decentered with respect to the center of the radial line slot antenna 40, thereby uniformizing the intensity variation of the microwave along the diameter direction of the wafer W. Further, it is possible to perform a plasma treatment that is uniform in the surface. In FIG.
- the center of the susceptor 10 and the center of the support shaft 20 coincide, but for example, as shown in FIG.
- the center of the radial line slot antenna 40 and the center of the radial line slot antenna 40 may be at the same position, and the support shaft 20 may be connected to a position eccentric with respect to the center of the susceptor 10.
- the center of the wafer W is arranged at a position eccentric to the center of the susceptor 10 as shown in FIG. , The center of rotation of the wafer W and the center of microwave irradiation may be decentered.
- an elevating mechanism 140 for elevating the susceptor 10 may be provided as shown in FIG.
- a bellows 141 that is airtightly connected to the main body 2a and the casing 81 is provided between the lower end surface of the main body 2a and the upper end surface of the casing 81.
- the structure which raises / lowers the susceptor 10 can be proposed. By raising and lowering the susceptor 10, it is possible to average the intensity distribution of the microwaves along the diameter direction of the wafer W, which cannot be averaged only by the rotational operation of the susceptor 10, and perform more uniform plasma processing of the wafer W. .
- the lift arm 15 and the lift pins 14 are provided separately. However, even if the lift arm 15 is lowered due to charging of the wafer W by the electrostatic chuck, the lift pins 14 are moved to the wafer W. You may not be away from.
- another lift arm 150 is provided above the lift arm 15 at a predetermined interval, and the lift pins 14 are separated from the wafer W by the other lift arm 150. Also good.
- the lower end portion 14b of the elevating pin 14 is formed as a locking portion thicker than the outer diameter of the elevating pin 14, and as shown in FIG.
- the lift arm 15 pushes the lower end portion 14b of the lift pin 14 upward to raise the lift pin 14 and when the lift pin 14 is lowered, another lift
- the lower end portion 14 b is locked to the lower surface of the arm 150, and the other lift arm 150 is lowered in this state, whereby the lift pin 14 is pushed down by the other lift arm 150.
- the elevating pins 14 can be pulled away from the wafer W.
- the lift arm 15 and the other lift arm 150 may operate in synchronization or may operate individually.
- the present invention is applied to plasma processing for performing film formation.
- the present invention is also applied to substrate processing other than film formation, for example, plasma processing for performing etching or sputtering. it can.
- the target object to be processed by the plasma processing of the present invention may be any of a glass substrate, an organic EL substrate, a substrate for FPD (flat panel display), and the like.
- the present invention is useful for plasma processing of, for example, semiconductor wafers, and is particularly useful for plasma processing using microwaves.
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Abstract
Description
本願は、2014年7月15日に日本国に出願された特願2014-145186号に基づき、優先権を主張し、その内容をここに援用する。
2 処理容器
3 マイクロ波供給部
10 サセプタ
11 整合器
12 高周波電源
13 ヒータ
14 昇降ピン
15 リフトアーム
16 昇降機構
17 フォーカスリング
20 支持軸
21 フランジ
30 排気室
31 排気機構
32 排気管
33 調整弁
34 バッフル板
35 回転シール機構
40 ラジアルラインスロットアンテナ
41 マイクロ波透過板
42 スロット板
43 遅波板
50 同軸導波管
60 第1の処理ガス供給管
70 第2の処理ガス供給管
80 ベアリング
81 ケーシング
82 ロータリージョイント
83 回転駆動機構
84 チョーク
85 磁性流体シール
W ウェハ
Claims (6)
- 基板をマイクロ波プラズマにより処理するプラズマ処理装置であって、
基板を気密に収容する処理容器と、
前記処理容器内にマイクロ波を照射するマイクロ波供給部と、
前記処理容器内に処理ガスを供給する処理ガス供給部と、
前記処理容器内において基板を保持する基板保持機構と、
前記処理容器の底面を上下方向に貫通し、基板保持機構の下面を支持する支持軸と、
前記処理容器の外部に設けられ、前記支持軸を回転させる回転駆動機構と、
前記支持軸と前記処理容器との間を気密に塞ぐ磁性流体シールと、
前記磁性流体シールよりも上方に設けられ、前記支持軸と前記処理容器との間からのマイクロ波の漏洩により前記磁性流体シールが加熱されることを防止するチョーク機構と、を有する。 - 請求項1に記載のプラズマ処理装置において、
前記磁性流体シールと前記チョーク機構との間には、ラジカルを遮蔽する他のシール部材が更に設けられている。 - 請求項1に記載のプラズマ処理装置において、
前記支持軸には、前記処理容器の外部に設けられた冷媒供給機構から供給される冷媒を流通させる冷媒流路が内蔵されており、
前記冷媒流路と前記冷媒供給機構は、ロータリージョイントを介して接続されている。 - 請求項1に記載のプラズマ処理装置において、
前記基板保持機構は、基板を加熱するヒータを備え、
前記ヒータに電流を供給する導線は前記支持軸に内蔵され、
前記ヒータに電流を供給する電源と前記導線とは、スリップリングを介して接続されている。 - 請求項1に記載のプラズマ処理装置において、
前記支持軸の回転中心または前記基板の中心の少なくともいずれかは、前記マイクロ波供給部からのマイクロ波の照射中心に対して、平面視において偏心位置にある。 - 請求項1に記載のプラズマ処理装置において、
前記基板保持機構を上下方向に挿通し、基板保持機構に対して移動自在に設けられた昇降ピンと、
前記昇降ピンを昇降させる昇降機構と、をさらに有し、
前記昇降機構は、前記昇降ピンを上方に押圧するリフトアームと、前記昇降ピンを下方に押し下げる他のリフトアームを備え、
前記昇降ピンは、前記基板保持機構の厚みよりも長く形成され、
前記昇降ピンの下端部には、前記他のリフトアームにより前記昇降ピンを押し下げる際に前記他のリフトアームと係止する係止部が設けられている。
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JP2020167288A (ja) | 2019-03-29 | 2020-10-08 | 東京エレクトロン株式会社 | プラズマ処理装置及びプラズマ処理装置のメンテナンス方法 |
JP7285693B2 (ja) * | 2019-05-23 | 2023-06-02 | 東京エレクトロン株式会社 | ステージ装置および処理装置 |
JP7334507B2 (ja) * | 2019-07-03 | 2023-08-29 | 東京エレクトロン株式会社 | シール構造、真空処理装置及びシール方法 |
KR102573720B1 (ko) * | 2019-12-10 | 2023-09-04 | 주식회사 원익아이피에스 | 기판 처리 장치 |
KR102378581B1 (ko) * | 2020-06-19 | 2022-03-24 | 씰링크 주식회사 | 회전축 밀폐장치 및 이를 이용하는 반도체 기판처리장치 |
CN113088934A (zh) * | 2020-12-14 | 2021-07-09 | 芯三代半导体科技(苏州)有限公司 | 旋转装置 |
US20230238269A1 (en) * | 2022-01-21 | 2023-07-27 | Applied Materials, Inc. | Rotatable thermal processing chamber |
KR102619965B1 (ko) * | 2022-05-16 | 2024-01-02 | 세메스 주식회사 | 기판 처리 장치 및 기판 처리 방법 |
CN115206848B (zh) * | 2022-08-01 | 2023-10-24 | 北京屹唐半导体科技股份有限公司 | 晶圆的热处理装置 |
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KR20170031144A (ko) | 2017-03-20 |
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JP2016021524A (ja) | 2016-02-04 |
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