WO2020054005A1 - 高周波電源装置および基板処理装置 - Google Patents
高周波電源装置および基板処理装置 Download PDFInfo
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- 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
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- 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
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- H01J37/321—Radio frequency generated discharge the radio frequency energy being inductively coupled to the plasma
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- H—ELECTRICITY
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- 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
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- H01J37/32—Gas-filled discharge tubes
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Definitions
- the present invention relates to a high-frequency power supply device and a substrate processing device.
- an antenna for generating high frequency is provided in a chamber, and high frequency power is supplied from a high frequency power supply to the antenna to generate plasma in the chamber.
- JP 2014-239029 A International Publication No. 2004/064460 JP 2004-228354 A JP 2005-532668 A
- the present inventors have studied a high frequency power supply for supplying high frequency power to a plurality of antennas provided in a chamber of a substrate processing apparatus. As a result, it has been found that, for example, when high frequency power is applied from two antennas, mutual interference occurs between the antennas or via plasma when the frequencies are close to each other. Therefore, even if an attempt is made to match the impedance to one antenna, the interference wave from the other side may interfere and the reflected wave does not decrease, and the impedance matching may not be completed. I knew it was going.
- An object of the present disclosure is to provide a high-frequency power supply device that can eliminate the influence of an interference wave during impedance matching.
- a high-frequency power supply that supplies high-frequency power of a different frequency to each of the plurality of antennas provided in the chamber includes a plurality of high-frequency power units that supply high-frequency power of a different frequency to each of the plurality of antennas; And a plurality of high frequency control units for controlling each of the high frequency power units.
- Each of the plurality of high frequency control units includes a fast Fourier transform unit and a filter unit. The fast Fourier transform unit performs fast Fourier transform on a signal captured as a reflected wave to decompose the signal into frequency components, and the filter unit removes a frequency component wave that is not output from its own high-frequency power unit.
- the influence of interference waves can be eliminated during impedance matching.
- FIG. 1 is a diagram illustrating a schematic configuration of a substrate processing apparatus having a high-frequency power supply device according to an embodiment.
- FIG. 2 is a diagram illustrating a configuration of a high-frequency power supply device according to an embodiment.
- FIG. 2 is a diagram illustrating a logical configuration example of a high-frequency control unit and a control unit in FIG. 1B. It is a flowchart which shows the frequency comparison method in the high frequency control part RFCN2 of 2nd port PT2.
- FIG. 5 is a diagram illustrating an operation sequence of the high-frequency control unit and the control unit.
- 13 is a diagram illustrating a schematic configuration of a substrate processing apparatus having a plurality of high-frequency power devices according to application example 1.
- FIG. 6 is a diagram illustrating an example of assignment of output frequencies of the plurality of high-frequency power devices of FIG. 5.
- FIG. 3 is a diagram illustrating a logical configuration example of a high-frequency control unit and a control unit of a high-frequency power supply device serving as a master.
- FIG. 3 is a diagram illustrating a logical configuration example of a high-frequency control unit and a control unit of a high-frequency power supply device serving as a slave.
- FIG. 4 is a diagram showing an operation sequence of the master and slave high-frequency power supply devices.
- FIG. 13 is a top view illustrating a configuration example 1 of a reaction furnace provided with a plurality of antennas according to application example 2.
- FIG. 14 is a top view illustrating a configuration example 2 of a reactor provided with a plurality of antennas according to application example 2.
- FIGS. 1A and 1B are diagrams illustrating a schematic configuration of a substrate processing apparatus having a high-frequency power supply device according to an embodiment.
- FIG. 1A is a diagram illustrating a schematic configuration of a substrate processing apparatus
- FIG. 1B is a diagram illustrating a configuration of a high-frequency power supply device.
- the substrate processing apparatus 1 includes a chamber 10 as a plasma reactor, two antennas ANT1 and ANT2 installed in the chamber 10, a high-frequency power supply RFGD, matching circuits MT1 and MT2, Is provided.
- the chamber 10 is a cylindrical reactor made of, for example, quartz.
- a substrate such as one or a plurality of semiconductor substrates is placed inside the chamber 10, and the substrate is subjected to film formation by plasma or etching by plasma.
- FIG. 1A illustrates a cylindrical reactor as the chamber 10, the present invention is not limited to this.
- the chamber 10 may be a cubic reactor.
- the substrate is not limited to a semiconductor substrate, and may be a glass substrate used for manufacturing a display panel.
- the antennas ANT1 and ANT2 are provided to generate plasma in the chamber 10.
- the antenna ANT1 is connected to the output of the high-frequency power supply unit RFG1 provided in the high-frequency power supply RFGD via the matching circuit MT1.
- the antenna ANT2 is connected via a matching circuit MT2 to an output of a high-frequency power supply unit RFG2 provided in the high-frequency power supply RFGD.
- two antennas ANT1 and ANT2 are provided in the chamber 10, but the number of antennas may be three or more.
- the high-frequency power supply RFGD includes a high-frequency power supply RFG1 that can generate high-frequency power at the frequency f1 and a high-frequency power supply RFG2 that can generate high-frequency power at the frequency f2.
- the high-frequency power supply RFGD has a first port PT1 to which the output of the high-frequency power supply RFG1 is supplied, and a second port PT2 to which the output of the high-frequency power supply RFG2 is supplied.
- Matching circuits MT1 and MT2 include, for example, elements such as variable capacitors and perform impedance matching with plasma sources such as antennas ANT1 and ANT2.
- the high-frequency power supply RFGD further controls a high-frequency control unit RFCT1 that controls the high-frequency power supply unit RFG1, a high-frequency control unit RFCT2 that controls the high-frequency power supply unit RFG2, and high-frequency control units RFCT1 and RTCT2. And a control unit CNT.
- the control unit CNT is a control module that controls the entire high-frequency power supply RFGD.
- the high-frequency control units RFCT1 and RTCT2 are modules that perform high-frequency output control and impedance matching control of each port (first port PT1 and second port PT2).
- the control unit CNT and the high-frequency control units RFCT1 and RTCT2 are connected by a bus BUS of LVDS (Low Voltage Differential Signaling) and a bus CANBUS1 using CAN (Controller Area Network), respectively, and have a bidirectional information transmission path.
- the control unit CNT includes a CAN interface CANIF, is connected to a bus CANBUS2 using CAN, and can perform CAN communication with an external device.
- the high-frequency control unit RFCT1 has a fast Fourier transform unit FFT1 and a digital filter unit DF1.
- the high frequency control unit RFCT2 includes a fast Fourier transform unit FFT2 and a digital filter unit DF2.
- FIG. 1A shows a state in which the traveling wave PF1 output from the first port PT1 appears as a reflected wave of the second port PT2, and the traveling wave PF2 output from the second port PT2 appears as a reflected wave of the first port PT1.
- the high-frequency reflected wave PR1 output from the first port PT1 and the high-frequency reflected wave PR2 output from the second port PT2 can be reduced by performing impedance matching by the matching circuits MT1 and MT2.
- the interference wave PF2 sneaking into the first port PT1 and the interference wave PF1 sneaking into the second port PT2 can be reduced by the first port PT1 and the second port PT2 performing impedance matching independently. There was a problem that it could not be done.
- the present invention solves the above problems by employing the following configuration.
- the present invention contemplates a method of controlling the frequency of a high-frequency power supply used for frequency matching in order to eliminate the influence of interference waves during the matching operation.
- the frequency of each high-frequency output operates so that the frequency of each high-frequency output operates within a range where interference can be removed. Is controlled by the high frequency power supply RFGD.
- the fast Fourier transform units (FFT1, FFT2) of the high-frequency control units (RFCT1, RFCT2) decompose the signals captured as reflected waves into frequency components by FFT (fast Fourier transform) and do not output their own.
- the wave of the frequency component is removed by the digital filter unit (DF1 or DF2) provided in the high frequency control unit (RFCT1 or RFCT2).
- the mutual frequencies do not approach from a range in which interference can be removed by attenuation in the digital filter unit (DF1 or DF2).
- the operation of the frequency matching is partially restricted.
- FIG. 2 is a diagram illustrating a logical configuration example of the high-frequency control unit and the control unit in FIG. 1B.
- the high-frequency control unit RFCN1 includes a matching operation unit MTC1, a frequency movable unit FCH1, and a communication unit COM1.
- the high-frequency control unit RFCN2 includes a matching operation unit MTC2, a frequency movable unit FCH2, and a communication unit COM2.
- the control unit CNT includes a communication unit CMM1 and a communication unit CMM2.
- the high-frequency controller RFCN1 is a master, and the high-frequency controller RFCN2 is a slave.
- the two master / slave determinations can be made by DIP switches mounted on the high frequency control units RFCN1 and RFCN2.
- the high frequency control unit RFCN1 as the master does not particularly perform an operation for avoiding interference, and the high frequency control unit RFCN2 as the slave performs an operation for avoiding interference.
- the matching operation unit MTC1 determines a frequency (f1) to be used for impedance matching of the first port PT1 from a predetermined matching algorithm.
- the matching calculation unit MTC1 passes the frequency information IFPT1 to the frequency variable unit FCH1, and the frequency variable unit FCH1 causes the high frequency power supply unit RFG1 of the first port PT1 to output high frequency power of a desired frequency (f1).
- the matching calculation unit MTC1 passes the frequency information IFPT1 to the communication unit COM1, and the communication unit COM1 outputs the frequency information IFPT1 to the communication unit CMM1 of the control unit CNT using the bus BUS.
- the communication unit CMM1 outputs the frequency information IFPT1 of the first port PT1 to the communication unit CMM2.
- the communication unit CMM2 outputs the frequency information IFPT1 of the first port PT1 to the communication unit COM2 of the high-frequency control unit RFCN2 using the bus BUS.
- the communication unit COM2 outputs the frequency information IFPT1 of the first port PT1 to the matching operation unit MTC2.
- the frequency information IFPT1 of the first port PT1 input from the communication unit COM2 is compared with the frequency calculated from a predetermined matching algorithm, and the impedance on the second port PT2 side is compared.
- the frequency (f2) used for matching is determined.
- the matching operation unit MTC2 outputs the frequency information IFPT2 of the second port PT2 to the frequency movable unit FCH2. Accordingly, the frequency movable unit FCH2 causes the high-frequency power supply unit RFG2 of the second port PT2 to output high-frequency power of a desired frequency (f2).
- FIG. 3 is a flowchart showing a frequency comparison method in the high-frequency control unit RFCN2 of the second port PT2.
- f1 is the output frequency of the first port PT1
- f2 is the output frequency of the second port PT2.
- the high-frequency control unit RFCN2 determines the frequency aMHz required for the impedance matching derived by the matching calculation unit MTC2. If the difference frequency with the frequency f1 on the first port PT1 side is within 10 kHz, the difference frequency with f1 is determined. Is finally adopted as 10 kHz.
- 10 kHz is the lowest value of the frequency band in which the interference between the first port PT1 and the second port PT2 can be suppressed by the digital filter units DF1 and DF2.
- the difference frequency of 10 kHz is a value when the sampling method of the digital filter units DF1 and DF2 is undersampled. If the sampling method of the digital filter units DF1 and DF2 is changed to oversampling, the difference frequency of 10 kHz can be adjusted to a closer frequency such as 1 kHz.
- Step S1 The matching operation is started.
- Step S2 It is determined whether or not the matching has been completed. If the matching has not been completed (No), the process proceeds to step S3. If the matching has been completed (Yes), the process proceeds to step S4, and the matching operation ends.
- Step S3 Calculate the frequency calculated from the predetermined matching algorithm.
- f2 a MHz.
- 28.12 MHz is the maximum frequency that the high-frequency power supply RFGD can output. If they do not match, the process moves to step S6. If they match, the process moves to step S7.
- the frequency is set. In this case, f1 is 28.12 MHz.
- 26.12 MHz is the minimum output frequency of the high-frequency power supply RFGD. If they do not match, the process moves to step S8. If they match, the process moves to step S9.
- step S14 the process proceeds to step S2, where it is determined again whether or not the alignment has been completed.
- FIG. 4 is a diagram showing an operation sequence of the high frequency control unit and the control unit.
- f11 and f12 indicate the frequency of the high-frequency power supply unit RFG1 of the first port PT1
- f21 and f22 indicate the frequency of the high-frequency power supply unit RFG2 of the second port PT2.
- f11 and f21 indicate the first set values
- f12 and f22 indicate the second set values.
- the high-frequency control unit RFCN1 performs a first matching operation using a predetermined matching algorithm, and sets the frequency f11 of the high-frequency power supply unit RFG1 of the first port PT1.
- Information on the set frequency f11 is transmitted to the high-frequency control unit RFCN2 via the control unit CNT as frequency information IFPT1 of the first port PT1.
- the high-frequency control unit RFCN2 performs the first matching operation using a predetermined matching algorithm and the frequency comparison of FIG. 3 with reference to the received information on the frequency f11 (IFPT1), and performs the high-frequency power supply unit RFG2 of the second port PT2. Frequency f21 is set.
- the high-frequency control unit RFCN1 performs a second matching operation using a predetermined matching algorithm, and sets the frequency f12 of the high-frequency power supply unit RFG1 of the first port PT1.
- Information on the set frequency f12 is transmitted to the high-frequency controller RFCN2 via the controller CNT as frequency information IFPT1 of the first port PT1.
- the high-frequency control unit RFCN2 refers to the received information (IFPT1) of the frequency f12 to perform the second matching operation using a predetermined matching algorithm and the frequency comparison in FIG. Then, the frequency f22 of the high-frequency power supply unit RFG2 of the second port PT2 is set.
- the output power of the high-frequency power supply units RFG1 and RFG2 is controlled, and frequency interference can be avoided.
- Impedance matching can be performed while avoiding frequency interference between a plurality of output ports (first port and second port). Accordingly, a correct matching operation can be performed in the substrate processing apparatus provided with the plurality of antennas in the reaction furnace 10, so that stable and high-quality plasma can be generated in the reaction furnace 10. Therefore, processing using stable plasma can be performed on the substrate.
- FIG. 5 is a diagram illustrating a schematic configuration of a substrate processing apparatus having a plurality of high-frequency power devices according to the application example 1.
- a plurality of antennas ANT1 to ANTn are provided in a chamber 10 which is a reaction furnace, and a plurality of high-frequency power supply devices RFGD0 to RFGDn are provided.
- Each of the plurality of high-frequency power supply devices RFGD0 to RFGDn has the same configuration as the high-frequency power supply device RFGD shown in FIG. 1B.
- the antennas ANT1 and ANT2 are connected to the high-frequency power supply RFGD0, and the antennas ANT3 and ANT4 are connected to the high-frequency power supply RFGD1.
- the antennas ANT5 and ANT5 are connected to the high-frequency power supply RFGD2, and the antennas ANT2n + 1 and ANT2n + 2 are connected to the high-frequency power supply RFGDn.
- Each of the plurality of high-frequency power supply devices RFGD0 to RFGDn is mutually connected by a CAN bus CANBUS2.
- the high-frequency power supply RFGD0 is a master (MS)
- the other high-frequency power supplies RFGD1 to RFGDn are slaves (SLV).
- Master (MS) / slave (SLV) can be set by a DIP switch provided in each control unit CNT of the high-frequency power supply devices RFGD0 to RFGDn, and can be determined.
- the high-frequency power supply RFGD0 which is the master (MS), transmits information on the output frequencies f1 and f2 of the high-frequency power generated by the high-frequency power supply units RFG1 and RFG2 in the high-frequency power supply RFGD0 to the slave (SLV) by broadcast communication using the CAN bus CANBUS2. ) Can be transmitted to the high-frequency power supply devices RFGD1 to RFGDn.
- FIG. 6 is a diagram showing an example of assignment of output frequencies of the plurality of high-frequency power supply devices of FIG.
- Each of the high-frequency power supply devices RFGD0 to RFGDn can generate high-frequency power having an output frequency between 26.12 MHz and 28.12 MHz, for example.
- the high-frequency power supply RFGD0 can generate high-frequency power of output frequencies f1 and f2.
- the difference frequency between the frequency f1 and the frequency f2 is a difference frequency within a range in which interference can be removed by attenuation in the digital filter unit (DF1 or DF2).
- the difference frequency is, for example, 10 kHz.
- the high-frequency power supply RFGD1 can generate high-frequency power of output frequencies f3 and f4.
- the difference frequency between the frequency f3 and the frequency f4 is, for example, 10 kHz based on the same concept.
- the difference frequency between the frequency f2 and the frequency f3 is, for example, 10 kHz.
- the high-frequency power supply RFGD2 can generate high-frequency power of output frequencies f5 and f6.
- the difference frequency between the frequency f5 and the frequency f6 is, for example, 10 kHz based on the same concept.
- the difference frequency between the frequency f4 and the frequency f5 is, for example, 10 kHz.
- the high-frequency power supply RFGDn can generate high-frequency power having output frequencies f2n + 1 and f2n + 2.
- the difference frequency between the frequency f2n + 1 and the frequency f2n + 2 is, for example, 10 kHz based on the same concept.
- the frequency range between 26.12 MHz and 28.12 MHz can be effectively used, and interference can be avoided in each of the high-frequency power supply devices RFGD0 to RFGDn.
- the setting of the frequency as shown in FIG. 6 can be automatically set by the value of the DIP switch as follows. That is, the master and slave high-frequency power supply devices RFGD0 to RFGDn can uniquely determine their own ID numbers n based on the values of their own DIP switches (for example, 0 to 15). For example, the ID number of the master (MS) is 0, and the ID number of the slave (SLV) is 1 to 15.
- the slave (SLV) is set to a frequency separated by 10 kHz ⁇ n from the value of the frequency received from the master (MS).
- n is its own ID number of each slave, and n ⁇ 1.
- CANIDs set in the high-frequency power supply devices RFGD0 to RFGDn can be used instead of setting the ID numbers using the DIP switches.
- FIG. 7 is a diagram illustrating a logical configuration example of the high-frequency control unit and the control unit of the high-frequency power supply device that is set as the master.
- FIG. 8 is a diagram illustrating a logical configuration example of the high-frequency control unit and the control unit of the high-frequency power supply device set as a slave.
- FIG. 7 differs from FIG. 2 in that in FIG. 7, in the high-frequency control unit RFCN2 of the high-frequency power supply RFGD0, the frequency information IFPT2 of the second port PT2 from the matching operation unit MTC2 is transmitted via the communication unit COM2 to the control unit.
- An external communication unit CMM3 is added to the point of output to the communication unit CMM2 of the CNT and the control unit CNT of the high-frequency power supply RFGD0, and the external communication unit CMM3 is provided with the frequency information IFPT1 from the communication unit CMM1 and the frequency from the communication unit CMM2. The point is that the information IFPT2 is received and the master frequency information IFM is transmitted.
- the frequency information IFM is information including the frequency information IFPT1 and the frequency information IFPT2.
- the external communication unit CMM3 outputs the frequency information IFM via the CAN bus CANBUS2 to the high-frequency power supply RFGD1, which is set as a slave.
- the matching operation unit MTC1 determines a frequency (f1) to be used for impedance matching of the first port PT1 from a predetermined matching algorithm.
- the matching calculation unit MTC1 passes the frequency information IFPT1 to the frequency variable unit FCH1, and the frequency variable unit FCH1 causes the high frequency power supply unit RFG1 of the first port PT1 to output high frequency power of a desired frequency (f1).
- the matching calculation unit MTC1 passes the frequency information IFPT1 to the communication unit COM1, and the communication unit COM1 outputs the frequency information IFPT1 to the communication unit CMM1 of the control unit CNT using the bus BUS.
- the communication unit CMM1 outputs the frequency information IFPT1 of the first port PT1 to the communication unit CMM2 and the external communication unit CMM3.
- the communication unit CMM2 outputs the frequency information IFPT1 of the first port PT1 to the communication unit COM2 of the high-frequency control unit RFCN2 using the bus BUS.
- the communication unit COM2 outputs the frequency information IFPT1 of the first port PT1 to the matching operation unit MTC2.
- the frequency information IFPT1 of the first port PT1 input from the communication unit COM2 is compared with the frequency calculated from a predetermined matching algorithm, and the impedance on the second port PT2 side is compared.
- the frequency (f2) used for matching is determined.
- the matching operation unit MTC2 outputs the frequency information IFPT2 of the second port PT2 to the frequency movable unit FCH2. Accordingly, the frequency movable unit FCH2 causes the high-frequency power supply unit RFG2 of the second port PT2 to output high-frequency power of a desired frequency (f2).
- the matching operation unit MTC2 outputs the frequency information IFPT2 of the second port PT2 to the communication unit COM2.
- the communication unit COM2 outputs the frequency information IFPT2 of the second port PT2 to the communication unit CMM2.
- the communication unit CMM2 outputs the frequency information IFPT2 of the second port PT2 to the external communication unit CMM3.
- the external communication unit CMM3 outputs the frequency information IFPT1 of the first port PT1 and the frequency information IFPT2 of the second port PT2 as the master-side frequency information IFM to the high-frequency power supply RFGD1, which is a slave, via the CAN bus CANBUS2. I do.
- the high-frequency control unit RFCN1 of the high-frequency power supply RFGD1 which is a slave, includes a matching operation unit MTC1, a frequency movable unit FCH1, and a communication unit COM1.
- the high frequency control unit RFCN2 of the high frequency power supply RFGD1 includes a matching operation unit MTC2, a frequency movable unit FCH2, and a communication unit COM2.
- the control unit CNT of the high-frequency power supply RFGD1 includes a communication unit CMM1, a communication unit CMM2, and an external communication unit CMM3.
- the external communication unit CMM3 receives the master-side frequency information IFM via the CAN bus CANBUS2, and outputs the received frequency information IFM to the communication unit CMM1.
- the communication unit CMM1 outputs the master-side frequency information IFM to the communication unit COM1.
- the communication unit COM1 outputs the master-side frequency information IFM to the matching operation unit MTC1.
- the matching operation unit MTC1 compares the master-side frequency information IMF (IFPT1, IFPT2) input from the communication unit COM1 with the frequency calculated from a predetermined matching algorithm, and performs impedance matching on the slave-side first port PT1. To determine the frequency (f3) to be used.
- IMF master-side frequency information
- the frequency (f3) determined by the matching operation unit MTC1 is passed to the frequency movable unit FCH1 as frequency information IFPT1S, and the high-frequency power of the frequency (f3) is output from the high-frequency power supply unit RFG1 of the first port PT1 on the slave side.
- the matching operation unit MTC1 outputs the determined frequency information IFPT1S of the first port PT1 to the communication unit COM1.
- the communication unit COM1 outputs the frequency information IFPT1S of the first port PT1 input to the communication unit CMM1.
- the communication unit CMM1 outputs the frequency information IFPT1S of the first port PT1 to the communication unit CMM2.
- the communication unit CMM2 outputs the frequency information IFPT1S of the first port PT1 to the communication unit COM2.
- the communication unit COM2 outputs the frequency information IFPT1S of the first port PT1 to the matching operation unit MTC2.
- the frequency information IFPT1S of the first port PT1 input from the communication unit COM2 is compared with the frequency calculated from a predetermined matching algorithm, and the frequency used for impedance matching on the second port PT2 side ( f4) is determined.
- the frequency (f4) determined by the matching operation unit MTC2 is passed to the frequency movable unit FCH2 as frequency information IFPT2S, and the high-frequency power of the frequency (f4) is output from the high-frequency power supply unit RFG2 of the second port PT2 on the slave side.
- FIG. 9 is a diagram showing an operation sequence of the master and slave high-frequency power supply devices.
- f11 and f12 indicate the frequency of the high-frequency power supply unit RFG1 of the first port PT1 of the high-frequency power supply RFGD0 (MS) set as the master
- f21 and f22 indicate the high-frequency power supply RFGD0 set as the master
- (MS) shows the frequency of the high-frequency power supply unit RFG2 of the second port PT2.
- f11 and f21 indicate the first set values
- f12 and f22 indicate the second set values.
- f11S and f12S indicate the frequency of the high-frequency power supply unit RFG1 of the first port PT1 of the high-frequency power supply RFGDn (SLV) set as the slave
- f21S and f22S indicate the frequency of the high-frequency power supply RFGDn (SLV) set as the slave. It shows the frequency of the high-frequency power supply unit RFG2 of the second port PT2.
- f11S and f21S indicate the first set values
- f12S and f22S indicate the second set values.
- RFGDn high frequency power supply
- RFGD1 RFGD1
- f11S and f12S described below correspond to f3 in FIG. 8
- f21S and f22S described below correspond to f4 in FIG. Corresponding.
- the high-frequency controller RFCN1 performs a first matching operation using a predetermined matching algorithm, and sets the frequency f11 of the high-frequency power supply RFG1 of the first port PT1.
- Information on the set frequency f11 is transmitted to the high-frequency control unit RFCN2 via the control unit CNT as frequency information IFPT1 of the first port PT1.
- the high-frequency control unit RFCN2 performs the first matching operation using a predetermined matching algorithm and the frequency comparison of FIG. 3 with reference to the received information on the frequency f11 (IFPT1), and performs the high-frequency power supply unit RFG2 of the second port PT2. Frequency f21 is set.
- the high-frequency control unit RFCN2 transmits information of the frequency f21 to the control unit CNT as frequency information IFPT2 of the second port PT2.
- the control unit CNT transmits the first frequency information IFM1 including the frequency information IFPT1 and the frequency information IFPT2 to the control unit CNT of the high-frequency power supply RFGDn (SLV).
- the high-frequency control unit RFCN1 performs a second matching operation using a predetermined matching algorithm, and sets the frequency f12 of the high-frequency power supply unit RFG1 of the first port PT1.
- Information on the set frequency f12 is transmitted to the high-frequency controller RFCN2 via the controller CNT as frequency information IFPT1 of the first port PT1.
- the high-frequency control unit RFCN2 refers to the received information on the frequency f12 (IFPT1), and performs the second matching operation using a predetermined matching algorithm and FIG. A frequency comparison is performed to set the frequency f22 of the high-frequency power supply unit RFG2 of the second port PT2.
- the high-frequency control unit RFCN2 transmits information of the frequency f22 to the control unit CNT as frequency information IFPT2 of the second port PT2.
- the control unit CNT transmits the second frequency information IFM2 including the frequency information IFPT1 and the frequency information IFPT2 to the control unit CNT of the high-frequency power supply RFGDn (SLV).
- the control unit CNT that has received the first frequency information IFM1 transmits the frequency information IFM1 to the high-frequency control unit RFCN1.
- the high-frequency control unit RFCN1 refers to the received frequency information IFM1, performs a first matching operation using a predetermined matching algorithm, and compares the frequency of FIG. 3 to determine the frequency f11S of the high-frequency power supply unit RFG1 of the first port PT1.
- Set. Information on the set frequency f11S is transmitted to the high-frequency controller RFCN2 via the controller CNT as frequency information IFPT1S of the first port PT1.
- the high frequency control unit RFCN2 performs the first matching operation using a predetermined matching algorithm and the frequency comparison of FIG. 3 with reference to the received information (IFPT1S) of the frequency f11S, and performs the high frequency power supply unit RFG2 of the second port PT2. Frequency f21S is set.
- the control unit CNT that has received the second frequency information IFM2 transmits the frequency information IFM1 to the high frequency control unit RFCN1.
- the high-frequency control unit RFCN1 After 4 ms from the first matching operation and frequency comparison, the high-frequency control unit RFCN1 performs the second matching operation and frequency comparison using a predetermined matching algorithm with reference to the received frequency information IFM1, and the first port PT1
- the frequency f12S of the high frequency power supply unit RFG1 is set.
- Information on the set frequency f12S is transmitted to the high-frequency controller RFCN2 via the controller CNT as frequency information IFPT1S of the first port PT1.
- the high-frequency control unit RFCN2 refers to the received information of the frequency f12S (IFPT1S), and performs the second matching operation using a predetermined matching algorithm and the frequency comparison in FIG. To set the frequency f22S of the high-frequency power supply unit RFG2 of the second port PT2.
- the output frequency of the high-frequency power generated from each port can be impedance-matched while avoiding frequency interference. , Can be set.
- control software to be mounted can be implemented by the same software for the master high-frequency power supply and the slave high-frequency power supply. Therefore, it is not necessary to separately develop the software of the master high-frequency power supply device and the software of the slave high-frequency power supply device, so that it is economical and the software development cost can be reduced.
- FIGS. 10A and 10B are top views of a reactor provided with a plurality of antennas according to application example 2.
- FIG. FIGS. 10A and 10B illustrate a configuration in which, for example, 16 antennas are arranged inside a chamber (reactor) 10 of the substrate processing apparatus 1.
- the 16 antennas are provided on a ceiling-side wall portion of the chamber (reactor) 10 so as to be located above a substrate disposed in the chamber (reactor) 10.
- the substrate is, for example, a glass substrate used for manufacturing a display panel.
- FIG. 10A shows a configuration example 1 in which 16 antennas A to P are arranged in rows and columns at equal intervals in the vertical and horizontal directions inside the chamber 10 (wall portion on the ceiling side).
- Each of the antennas A to P is supplied with high frequency power from each of the high frequency power supply units RFG1 to RFG16 via a matching unit.
- the high-frequency power supply unit RFG1 is connected to the antenna A, and the high-frequency power of the frequency f1 is supplied through the matching unit.
- the high-frequency power supply RFG2 is connected to the antenna B, and supplied with high-frequency power of the frequency f2 via the matching device.
- the output frequencies f1 to f16 of the high frequency power supply units RFG1 to RFG16 are set such that frequency interference can be avoided, as described with reference to FIGS.
- FIG. 10A the same number of high frequency power supply units having different output frequencies as the number of antennas are provided.
- the frequency is increased by the number of the high-frequency power supply units, there is a possibility that the content managed by the system increases. Further, each high-frequency power supply unit needs to be able to synchronize, and it is necessary to exchange respective frequency information.
- the number of high-frequency power supply units increases, there is a possibility that the size and cost will increase accordingly.
- FIG. 10B is a diagram showing a configuration example 2 in which 16 antennas are arranged in a matrix at equal intervals in the vertical and horizontal directions inside the chamber 10 (portion on the ceiling side).
- high-frequency power of a different frequency is supplied to each antenna, but in FIG. 10B, 16 antennas are classified into, for example, four groups A, B, C, and D.
- the antenna A of the first group is connected via a matching unit to a high-frequency power supply unit RFG1 that outputs high-frequency power of the frequency f1.
- the antenna B of the second group is connected via a matching unit to a high-frequency power supply unit RFG2 that outputs high-frequency power of the frequency f2.
- the third group of antennas C is connected via a matching device to a high-frequency power supply unit RFG3 that outputs high-frequency power having a frequency f3.
- the fourth group of antennas D is connected via a matching unit to a high-frequency power supply unit RFG4 that outputs high-frequency power of frequency f4.
- the output frequencies f1 to f4 of the high frequency power supply units RFG1 to RFG4 are set such that frequency interference can be avoided as described with reference to FIGS.
- antennas classified into other groups are arranged next to the antenna A of the first group.
- the number of groups (four groups in this example) is smaller than the number of a plurality of antennas (16 in this example).
- the number of groups (four groups in this example) is the same as the number of high frequency power units (four high frequency power units RFG1 to RFG4 in this example).
- the degree of the interference occurring in the chamber 10 is basically improved as the physical distance increases. Therefore, when a plurality of antennas are arranged at a fixed distance from each other, for example, when only interference with adjacent antennas is large and there is no problem if the distance is longer, the same frequency is used for non-adjacent antennas. Can be used. That is, as shown in FIG. 10B, the same frequency is used for antennas that are physically separated from each other.
- FIG. 10A 16 frequencies f1 to f16 and 16 high-frequency power supply units RFG1 to RFG16 were required, whereas as shown in FIG. f4 and four high-frequency power supply units RFG1 to RFG4.
- interference can be avoided by shifting the frequency of the high-frequency power supply so as not to interfere.
- the detection of the reflected wave has a mechanism for removing the interference wave such as the FFT (FFT1, FFT2) and the digital filter unit (DF1, DF2).
- substrate processing apparatus 10 chamber (reactor) MT1, MT2: matching device ANT1, ANT2: antenna
- RFGD high-frequency power supply
- RFG1 high-frequency power supply
- RFCN1 high-frequency control
- CNT control FFT1
- FFT2 high-speed Fourier transform
- DF1 digital filter
- MTC1 MTC2: matching operation unit
- FCH1 FCH2: frequency movable unit COM1, COM2
- CMM1, CMM2 communication unit
- CMM3 external communication unit
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Abstract
Description
図5は、応用例1に係る複数の高周波電源装置を有する基板処理装置の概略構成を示す図である。応用例では、反応炉であるチャンバー10内に複数のアンテナANT1~ANTnが設けられ、また、複数の高周波電源装置RFGD0~RFGDnが設けられる。
図10A、図10Bは、応用例2に係る複数のアンテナを設けた反応炉の上面図である。図10A、図10Bは、基板処理装置1のチャンバー(反応炉)10の内部に、例示的に、16本のアンテナを配置した構成である。16本のアンテナは、チャンバー(反応炉)10に配置された基板の上側に位置するように、チャンバー(反応炉)10の天井側の壁部分に設けられている。基板は、たとえば、表示パネルの製造に利用されるガラス基板である。
10:チャンバー(反応炉)
MT1,MT2:整合器
ANT1,ANT2:アンテナ
RFGD:高周波電源装置
RFG1、RFG2:高周波電源部
RFCN1,RFCN2:高周波制御部
CNT:制御部
FFT1、FFT2:高速フーリエ変換部
DF1、DF2:デジタルフィルタ部
MTC1、MTC2:整合演算部
FCH1、FCH2:周波数可動部
COM1、COM2、CMM1、CMM2:通信部
CMM3:外部通信部
Claims (12)
- チャンバー内に設けた複数のアンテナのそれぞれに異なる周波数の高周波電力を供給する高周波電源装置であって、
前記高周波電源装置は、
前記複数のアンテナのそれぞれに異なる周波数の高周波電力を供給する複数の高周波電力部と、
前記複数の高周波電力部のそれぞれを制御する複数の高周波制御部と、を含み、
前記複数の高周波制御部の各々は、
高速フーリエ変換部と、フィルタ部と、を含み、
前記高速フーリエ変換部は、反射波として取り込まれた信号を高速フーリエ変換して周波数成分に分解し、
前記フィルタ部は、自身の高周波電力部から出力していない周波数成分の波を除去する、
高周波電源装置。 - 請求項1において、
前記複数のアンテナのそれぞれに供給される高周波電力の周波数の差分周波数は、前記フィルタ部によって除去可能な範囲である、高周波電源装置。 - 請求項1において、
前記複数のアンテナと前記複数の高周波電力部との間に設けられた複数の整合器を含む、高周波電源装置。 - チャンバー内に設けた第1アンテナおよび第2アンテナに接続された第1高周波電源装置を有し、
前記第1高周波電源装置は、
前記第1アンテナに第1周波数の高周波電力を供給する第1高周波電力部と、
前記第2アンテナに第2周波数の高周波電力を供給する第2高周波電力部と、
前記第1高周波電力部を制御する第1高周波制御部と、
前記第2高周波電力部を制御する第2高周波制御部と、
を含み、
前記第1高周波制御部および前記第2高周波制御部の各々は、
高速フーリエ変換部と、フィルタ部と、を含み、
前記高速フーリエ変換部は、反射波として取り込まれた信号を高速フーリエ変換して周波数成分に分解し、
前記フィルタ部は、自身の高周波電力部から出力していない周波数成分の波を除去する、
高周波電源装置。 - 請求項4において、
前記第2高周波制御部は、前記第1周波数と所定の整合アルゴリズムから算出した周波数との比較を行い、インピーダンス整合に使用する前記第2周波数を決定する、高周波電源装置。 - 請求項5において、
前記前記第1周波数と前記第2周波数の差分周波数は、前記フィルタ部によって除去可能な範囲である、高周波電源装置。 - 請求項6において、
前記差分周波数は、10kMHzである、高周波電源装置。 - 請求項5において、さらに、
前記チャンバー内に設けた第3アンテナおよび第4アンテナに接続された第2高周波電源装置を有し、
前記第2高周波電源装置は、
前記第3アンテナに第3周波数の高周波電力を供給する第3高周波電力部と、
前記第4アンテナに第4周波数の高周波電力を供給する第4高周波電力部と、
前記第3高周波電力部を制御する第3高周波制御部と、
前記第4高周波電力部を制御する第4高周波制御部と、
を含み、
前記第3高周波制御部および前記第4高周波制御部の各々は、
高速フーリエ変換部と、フィルタ部と、を含み、
前記高速フーリエ変換部は、反射波として取り込まれた信号を高速フーリエ変換して周波数成分に分解し、
前記フィルタ部は、自身の高周波電力部から出力していない周波数成分の波を除去する、
高周波電源装置。 - 請求項8において、
前記第3高周波制御部は、前記第1周波数および前記第2周波数と、所定の整合アルゴリズムから算出した周波数との比較を行い、インピーダンス整合に使用する前記第3周波数を決定し、
前記第4高周波制御部は、前記第3周波数と所定の整合アルゴリズムから算出した周波数との比較を行い、インピーダンス整合に使用する前記第4周波数を決定する、高周波電源装置。 - 請求項9において、
前記第3周波数および前記第4周波数の差分周波数は、前記フィルタ部によって除去可能な範囲である、高周波電源装置。 - 反応炉と、
前記反応炉内に行列状に配置された複数のアンテナと、
異なる周波数の高周波電力を供給する複数の高周波電力部と、を有し、
前記複数のアンテナは、複数のグループに分類され、
1つのグループに分離されたアンテナの各々は1つの高周波電力部から前記高周波電力を供給されるように、前記複数のアンテナは前記複数の高周波電力部に接続され、
1つのグループに分離されたアンテナの隣には、他のグループに分類されたアンテナが配置される、
基板処理装置。 - 請求項11において、
前記複数のグループの数は、前記複数のアンテナの数より少なく、
前記複数のグループの数は、前記複数の高周波電力部の数と同じである、基板処理装置。
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