WO2013115110A1 - 離脱制御方法及びプラズマ処理装置の制御装置 - Google Patents
離脱制御方法及びプラズマ処理装置の制御装置 Download PDFInfo
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- WO2013115110A1 WO2013115110A1 PCT/JP2013/051654 JP2013051654W WO2013115110A1 WO 2013115110 A1 WO2013115110 A1 WO 2013115110A1 JP 2013051654 W JP2013051654 W JP 2013051654W WO 2013115110 A1 WO2013115110 A1 WO 2013115110A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6831—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using electrostatic chucks
- H01L21/6833—Details of electrostatic chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N13/00—Clutches or holding devices using electrostatic attraction, e.g. using Johnson-Rahbek effect
Definitions
- the present invention relates to a separation control method and a control device for a plasma processing apparatus.
- the plasma treatment is often performed in a vacuum atmosphere by evacuating the gas in the treatment container.
- a to-be-processed object is mounted on the electrostatic chuck
- ESC Electrostatic Chuck
- the electrostatic chuck has a configuration in which a conductive sheet-like chuck electrode is sandwiched between dielectric members.
- plasma processing plasma processing is performed after an object to be processed is attracted to an electrostatic chuck by a Coulomb force generated by turning on a voltage from a DC voltage source to a chuck electrode. At that time, a heat transfer gas is supplied between the wafer back surface and the electrostatic chuck surface.
- an inert gas is introduced into the processing chamber and maintained at a predetermined pressure while the plasma processing is being performed.
- the voltage is turned off after the voltage opposite to the voltage that has been turned on to the chuck electrode is turned on, and the charge removal process is performed to remove the charges existing in the electrostatic chuck and the workpiece.
- the support pin is raised to lift the object to be processed from the electrostatic chuck, and the object to be processed is detached from the electrostatic chuck.
- the surface of the electrostatic chuck changes with time.
- substances such as reaction products generated during plasma processing gradually adhere to the surface of the electrostatic chuck and deposit to form an insulating film. Since the deposited substance is easily charged and retains electric charge, the potential of the electrostatic chuck surface changes. Therefore, the attractive force of the electrostatic chuck is changed by these substances. Specifically, charges are accumulated in an insulating film formed on the surface of the electrostatic chuck, and residual charges remain on the surface of the electrostatic chuck even when the voltage to the chuck electrode is turned off. This residual charge cannot be removed even if the above-described charge removal process is performed. As a result, the support pin is raised in a state where the electrostatic attraction force due to the residual charge remains, which may cause damage to the object to be processed and hinder normal conveyance.
- Patent Document 1 in order to prevent a situation in which the object to be processed cannot be peeled off from the electrostatic chuck due to residual charges, the voltage that is turned on from the DC voltage source is turned off from the electrostatic chuck. When the wafer is lifted, the state of the residual charge attracting the wafer is detected, and the replacement timing of the electrostatic chuck is determined based on the detection result. In Patent Document 1, the state of the residual charge of the electrostatic chuck is detected from the torque of the drive motor for raising the support pins that support the wafer or the rotational speed of the motor.
- the thrust load (drive) is based on the assumption that the thrust load (torque of the drive motor) and the chucking force of the electrostatic chuck are proportional to each other when the workpiece is thrust from the electrostatic chuck by the thrust mechanism.
- the residual charge state of the electrostatic chuck is detected from the motor torque).
- the wafer W is raised by the support pins, the wafer is distorted.
- the wafer may be damaged.
- the method of repeating the push-up operation and the stop of the push-up operation according to the torque as in Patent Document 1 takes a lot of time, and it is difficult to realize it because the throughput is significantly reduced.
- An object of one aspect of the present invention is to provide a separation control method and a plasma processing apparatus control device capable of separating a workpiece from an electrostatic chuck by voltage control of a DC voltage source.
- a detachment control method for detaching an object to be processed from an electrostatic chuck having a chuck electrode and electrostatically attracting the object to be processed, wherein the chuck electrode is applied to the chuck electrode after plasma processing of the object to be processed.
- a step of obtaining a time integral value of the current from the result of measuring the current flowing from the chuck electrode for a predetermined time after turning off the on-voltage, and a predetermined charge charged when the chuck electrode is turned on during plasma processing A step of calculating a difference between a charge amount and a time integral value of the acquired current, a step of calculating a counter voltage according to a residual charge amount of the electrostatic chuck from the difference, and applying the counter voltage to the chuck electrode. And turning on the counter voltage, and then raising the support pins that support the object to be processed, detaching the object to be processed from the chuck, and Withdrawal control method characterized by comprising the steps of: turning off the motor voltage, is provided.
- a control device for a plasma processing apparatus having a chuck electrode and an electrostatic chuck for electrostatically attracting the object to be processed, wherein the voltage applied to the chuck electrode after the plasma processing of the object to be processed is applied.
- An acquisition unit that acquires a time integral value of a current from a result of measuring a current flowing from the chuck electrode after a predetermined time after being turned off; and a predetermined amount of charge that is charged when a voltage is turned on the chuck electrode during plasma processing.
- a difference between the acquired current and a time integral value is calculated, a counter voltage corresponding to the residual charge amount of the electrostatic chuck is calculated from the difference, the counter voltage is turned on the chuck electrode, and the counter voltage is set.
- a control unit that lifts the support pin that supports the object to be processed and then detaches the object to be processed from the chuck and turns off the counter voltage; Control device is provided, wherein the obtaining.
- FIG. 1 is an overall configuration diagram of a plasma processing apparatus according to an embodiment.
- the function block diagram of the control apparatus which concerns on one Embodiment. 6 is a flowchart for executing a separation control method according to an embodiment.
- plasma processing is performed after an object to be processed is attracted to an electrostatic chuck by a Coulomb force generated by turning on a voltage from a DC voltage source to a chuck electrode. At that time, a heat transfer gas is supplied between the wafer back surface and the electrostatic chuck surface. After the plasma processing, the supply of heat transfer gas is turned off, an inert gas such as N 2 or Ar is introduced into the processing chamber, and chucking is performed during the plasma processing while maintaining the processing chamber at a predetermined pressure (100 mTorr to 400 mTorr). The voltage is turned off after turning on a voltage that is opposite in polarity to the voltage that was on the electrode. By this process, the electrostatic chuck surface and the wafer are neutralized.
- a predetermined pressure 100 mTorr to 400 mTorr
- the surface of the electrostatic chuck changes with time.
- substances such as reaction products generated during plasma processing gradually adhere to the surface of the electrostatic chuck and deposit to form an insulating film. Since the deposited substance is easily charged and retains electric charge, the potential of the electrostatic chuck surface changes. Therefore, the attractive force of the electrostatic chuck is changed by these substances. Specifically, charges are accumulated in an insulating film formed on the surface of the electrostatic chuck, and residual charges remain on the surface of the electrostatic chuck even when the voltage to the chuck electrode is turned off. This residual charge cannot be removed even if the above-described charge removal process is performed. As a result, the support pin is raised in a state where the electrostatic attraction force due to the residual charge remains, which may cause damage to the object to be processed and hinder normal conveyance.
- the wafer in which a dielectric member having a volume resistivity of 1 ⁇ 10 12 to 14 ⁇ cm is formed by thermal spraying, the wafer may be detached even by a conventional method in which the wafer is detached by charge removal processing.
- a Coulomb type electrostatic chuck having a volume resistivity of 1 ⁇ 10 14 ⁇ cm or more electric charges are more difficult to escape on the surface layer of the electrostatic chuck, so that the wafer tends to remain. Becomes more difficult.
- a mechanism for adjusting the surface temperature of the electrostatic chuck at high speed with a heater (hereinafter referred to as a heater built-in electrostatic chuck mechanism) has been used.
- a member having a high volume resistivity of, for example, a volume resistivity of 1 ⁇ 10 14 ⁇ cm or more is employed for the electrostatic chuck. Therefore, the electrostatic chuck mechanism with a built-in heater uses a Coulomb type electrostatic chuck, that is, an electrostatic chuck having a dominant electrostatic attraction force, and the charge tends to remain on the surface layer. It has become difficult to remove a wafer that has been attracted from an electrostatic chuck. As a result, the use of electrostatic chuck mechanisms with built-in heaters has increased in recent years, and reaction products have accumulated on the surface of the electrostatic chuck, leaving residual charges. It has become prominent.
- a detachment control method capable of detaching the workpiece from the electrostatic chuck even when the electrostatic chuck mechanism with a built-in heater is used, and a control for executing the detachment control method.
- a plasma processing apparatus including the apparatus will be described.
- the plasma processing apparatus 1 shown in FIG. 1 is configured as an RIE type plasma processing apparatus, and has a cylindrical chamber (processing vessel 10) made of metal such as aluminum or stainless steel.
- the processing container 10 is grounded.
- a plasma process such as an etching process is performed on the object to be processed.
- a mounting table 12 for mounting a semiconductor wafer W (hereinafter referred to as a wafer W) as an object to be processed is provided.
- the mounting table 12 is made of, for example, aluminum, and is supported by a cylindrical support portion 16 that extends vertically upward from the bottom of the processing container 10 via an insulating cylindrical holding portion 14.
- a focus ring 18 made of silicon, for example, surrounding the upper surface of the mounting table 12 in an annular shape is arranged.
- An exhaust path 20 is formed between the inner wall of the processing container 10 and the outer wall of the cylindrical support 16.
- An annular baffle plate 22 is attached to the exhaust path 20.
- An exhaust port 24 is provided at the bottom of the exhaust path 20 and is connected to an exhaust device 28 via an exhaust pipe 26.
- the exhaust device 28 has a vacuum pump (not shown) and depressurizes the inside of the processing container 10 to a predetermined degree of vacuum.
- a gate valve 30 that opens and closes when the wafer W is loaded or unloaded is attached to the side wall of the processing chamber 10.
- a high-frequency power source 32 for generating plasma is electrically connected to the mounting table 12 via a power feed rod 36 and a matching unit 34.
- the high frequency power supply 32 applies, for example, high frequency power of 60 MHz to the mounting table 12.
- the mounting table 12 also functions as a lower electrode.
- a shower head 38 is provided as an upper electrode having a ground potential on the ceiling of the processing vessel 10. High frequency power for plasma generation from the high frequency power supply 32 is capacitively applied between the mounting table 12 and the shower head 38.
- An electrostatic chuck 40 is provided on the top surface of the mounting table 12 for holding the wafer W with electrostatic attraction.
- the electrostatic chuck 40 is obtained by sandwiching a chuck electrode 40a made of a conductive film between a pair of insulating layers or insulating sheets.
- the DC voltage source 42 is connected to the chuck electrode 40 a through the switch 43. When the voltage is turned on from the DC voltage source 42, the electrostatic chuck 40 attracts and holds the wafer W on the chuck with Coulomb force.
- the chuck 43 is connected to the ground portion 44 by the switch 43.
- turning off the voltage to the chuck electrode 40a means that the chuck electrode 40a is grounded.
- An ammeter 45 is provided between the chuck electrode 40a and the DC voltage source 42.
- the ammeter 45 measures the current value that flows when the voltage is turned on to the chuck electrode 40a to attract the wafer W during the plasma processing and the time integral value of the current. Alternatively, the current value that flows when the voltage is turned off after the plasma treatment and the time integral value of the current value are measured.
- the heat transfer gas supply source 52 supplies a heat transfer gas such as He gas or Ar gas to the back surface of the wafer W on the electrostatic chuck 40 through the gas supply line 54.
- the shower head 38 at the ceiling includes an electrode plate 56 having a large number of gas vent holes 56a, and an electrode support 58 that detachably supports the electrode plate 56.
- a buffer chamber 60 is provided inside the electrode support 58.
- a gas supply source 62 is connected to the gas inlet 60 a of the buffer chamber 60 via a gas supply pipe 64. With such a configuration, a desired gas is supplied from the shower head 38 into the processing container 10.
- a plurality of (for example, three) support pins 81 for raising and lowering the wafer W are provided inside the mounting table 12 in order to transfer the wafer W to and from an external transfer arm (not shown).
- the plurality of support pins 81 move up and down by the power of the motor 84 transmitted through the connecting member 82.
- a bottom bellows 83 is provided in the through hole of the support pin 81 that penetrates toward the outside of the processing container 10 to maintain airtightness between the vacuum side in the processing container 10 and the atmosphere side.
- an annular or concentric magnet 66 is arranged in two upper and lower stages.
- an RF electric field in the vertical direction is formed by a high-frequency power source 32 in a plasma generation space between the shower head 38 and the mounting table 12, and high-density plasma by a desired gas is formed near the surface of the wafer W. Is generated.
- a refrigerant pipe 70 is provided inside the mounting table 12.
- a refrigerant having a predetermined temperature is circulated and supplied from the chiller unit 71 to the refrigerant pipe 70 via the pipes 72 and 73.
- a heater 75 is embedded in the electrostatic chuck 40.
- a desired AC voltage is applied to the heater 75 from an AC power source (not shown). With this configuration, the processing temperature of the wafer W on the electrostatic chuck 40 is adjusted to a desired temperature by cooling by the chiller unit 71 and heating by the heater 75.
- the heater 75 may not be provided. Further, the heater 75 may be attached to the lower surface of the electrostatic chuck 40 together with the adhesive layer.
- the control device 100 includes various parts attached to the plasma processing apparatus 1, such as a gas supply source 62, an exhaust device 28, a heater 75, a DC voltage source 42, a switch 43, a matching unit 34, a high frequency power supply 32, and a heat transfer gas supply source 52.
- the motor 84 and the chiller unit 71 are controlled.
- the control device 100 acquires the current value detected by the ammeter 45 and the time integral value of the current value as needed.
- the control device 100 is also connected to a host computer (not shown).
- the control device 100 has a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory) (not shown), and the CPU executes plasma processing according to various recipes stored in these storage areas.
- the recipe includes process time, which is device control information for process conditions, process chamber temperature (upper electrode temperature, process chamber sidewall temperature, ESC temperature, etc.), pressure (gas exhaust), high frequency power and chuck electrode 40a, The voltage value to be turned off, various process gas flow rates, heat transfer gas flow rates, and the like are described.
- the gate valve 30 is first opened and the wafer W held on the transfer arm is loaded into the processing container 10.
- the wafer W is lifted from the transfer arm by the support pins 81 protruding from the surface of the electrostatic chuck 40, and the wafer W is held on the support pins 81.
- the support pins 81 are lowered into the electrostatic chuck 40, whereby the wafer W is placed on the electrostatic chuck 40.
- the gate valve 30 is closed, an etching gas is introduced from the gas supply source 62 into the processing container 10 at a predetermined flow rate, and the pressure in the processing container 10 is reduced to a set value by the exhaust device 28 to stabilize
- a predetermined high frequency power is applied from the high frequency power source 32 to the mounting table 12.
- a voltage is turned on from the DC voltage source 42 to the chuck electrode 40 a to fix the wafer W on the electrostatic chuck 40.
- the heat transfer gas supply source 52 supplies a heat transfer gas such as He gas or Ar gas to the back surface of the wafer W on the electrostatic chuck 40 through the gas supply line 54.
- the etching gas introduced in a shower form from the shower head 38 is turned into plasma by the high frequency power from the high frequency power source 32.
- plasma is generated in the plasma generation space between the upper electrode (shower head 38) and the lower electrode (mounting table 12), and the main surface of the wafer W is etched by radicals and ions in the generated plasma.
- the supply of heat transfer gas is turned off and the voltage to the chuck electrode 40a is turned off.
- an inert gas is introduced into the processing chamber and the processing chamber is maintained at a predetermined pressure, and a voltage that is opposite in polarity to the chuck electrode 40a during the plasma processing is applied to the chuck electrode 40a. Turn the voltage off after turning it on.
- a charge removal process for removing charges existing on the electrostatic chuck 40 and the wafer W is performed.
- the support pins 81 are raised to lift the wafer W from the electrostatic chuck 40, and the wafer W is detached from the electrostatic chuck 40.
- the support pins 81 are lowered and the wafer W is held on the transfer arm.
- the transfer arm goes out of the processing chamber, and the next wafer W is loaded into the processing chamber by the transfer arm. By repeating this process, the wafer W is continuously processed.
- FIG. 2 shows the state of the electrostatic chuck before the insulating film is formed
- S2 shows the residual adsorption state of the electrostatic chuck after the insulating film is formed
- S3 indicates the state of the electrostatic chuck when the counter voltage is turned on.
- the counter voltage is turned on to the chuck electrode 40a so that no residual attracting force is generated between the wafer W and the surface of the electrostatic chuck 40.
- the counter voltage is a balance between the negative charge as the total amount of residual charges and the positive charge of the chuck electrode 40a while the wafer W is gas-discharged. Is a voltage that is turned on from the DC voltage source 42 to the chuck electrode 40a so that the electric charge of the current becomes zero. In this state, no polarization occurs on the back side and the front side of the wafer W. As a result, the residual attracting force between the surface of the wafer W and the electrostatic chuck 40 becomes zero, the potential difference between the wafer W and the electrostatic chuck 40 disappears, and the wafer W can be detached from the electrostatic chuck 40.
- the time integral value of the current flowing through a predetermined time when the wafer W to the chuck electrode 40a was turned on predetermined is equal as in the time integration value Qoff and expressions of the current flowing through a predetermined time (1) when the voltage is turned off V 1.
- FIG. 3 shows a measuring apparatus according to an embodiment.
- the measuring device 200 includes an ionizer 202, an ammeter 204, a surface potential meter 206, a motor 208, an exhaust device 212, an electrostatic chuck 40, and a DC voltage source 42.
- the ionizer 202 charges the surface of the electrostatic chuck 40 to generate a pseudo residual charge.
- the motor 208 is driven, and the wafer W is lowered to the position just above the electrostatic chuck 40 and placed. Further, the voltage from the DC voltage source 42 is turned on or off to the chuck electrode 40 a of the electrostatic chuck 40. With the voltage applied to the chuck electrode 40a, the wafer 208 is pulled up by the motor 208, and the voltage when the wafer W is peeled off from the electrostatic chuck 40 is monitored.
- the time integral value of the current flowing from the chuck electrode 40a when the voltage is turned on or off to the chuck electrode 40a is monitored by an ammeter 204 between the chuck electrode 40a and the DC voltage source 42.
- the inside of the measuring device 200 can be depressurized by the exhaust device 212.
- Wafer W is to counter voltage V c to the total amount Q of the voltage at the time of peeling from the chuck electrode 40a predetermined residual charge. This is obtained by a predetermined total amount Q of residual charges having different values to obtain a correlation (value of ⁇ ) between the differential charge ⁇ Q and the counter voltage V c , thereby obtaining the relationship of Expression (4). From the above, the correlation between the difference charge ⁇ Q and the counter voltage V c can be obtained.
- FIG. 4 is a functional configuration diagram of the control device 100 according to the present embodiment
- FIG. 5 is a flowchart for executing the separation control method according to the embodiment.
- the control device 100 controls the plasma processing apparatus 1.
- the function of the control apparatus 100 that executes a control method for detaching the wafer W from the electrostatic chuck 40 will be mainly described.
- the control device 100 illustrated in FIG. 4 includes a process execution unit 105, an acquisition unit 110, a control unit 115, and a storage unit 120.
- the process execution unit 105 selects a desired process recipe from a plurality of recipes stored in the storage unit 120, and executes the process according to the process recipe. Here, an etching process is performed. In addition, the process execution unit 105 may execute the cleaning process according to the cleaning recipe stored in the storage unit 120.
- the acquisition unit 110 measures the time integral value Q′off of the current flowing from the chuck electrode 40a for a predetermined time after turning off the voltage that was on the chuck electrode 40a after the plasma processing, and obtains the time integral value of the current as the measurement result. To do.
- the control unit 115 determines a predetermined time integral value Qon of the current when the voltage to the chuck electrode 40a measured in a state without residual adsorption and a time integral value Qon the current acquired by the acquisition unit 110.
- the counter voltage V c corresponding to the charge ⁇ Q that is the difference from “off” is calculated.
- Control unit 115 an inert gas is introduced into the processing chamber, and turns on the counter voltage V c to the chuck electrode 40a.
- the control unit 115 executes voltage control (HV voltage control) from the DC voltage source 42, calculation of the counter voltage, control for raising and lowering the support pin 81, determination of the start condition of the counter voltage processing, and the like in the disconnection control described later.
- the storage unit 120 stores a plurality of process recipes for executing the etching process and recipes such as a cleaning recipe for executing the cleaning process.
- the storage unit 120 also stores the time integral value Qon of the current when the voltage to the chuck electrode 40a measured without residual adsorption, the capacitance Co between the wafer W and the chuck electrode 40a, the residual correlation between the charge ⁇ Q and the counter voltage V c of the difference is charged to the chuck electrode 40a is stored by the charge.
- the storage unit 120 can be realized as a RAM or a ROM using, for example, a semiconductor memory, a magnetic disk, or an optical disk.
- the recipe may be provided by being stored in a storage medium and read into the storage unit 120 via a driver (not shown), or may be downloaded from a network (not shown) and stored in the storage unit 120. May be. Further, a DSP (Digital Signal Processor) may be used instead of the CPU in order to realize the functions of the above-described units.
- a DSP Digital Signal Processor
- control device 100 may be realized by operating using software, or may be realized by operating using hardware.
- control device 100 that executes the separation control method according to the present embodiment has been described above. Next, a separation control method controlled by the control device 100 using the functions of the respective units of the control device 100 described above will be described with reference to FIG.
- the process gas and the high-frequency power are turned off (S104), the supply of the heat transfer gas is turned off (S105), an inert gas is introduced into the processing chamber, and a predetermined first pressure (100 mTorr to 400 mTorr). (S106).
- a predetermined first pressure 100 mTorr to 400 mTorr.
- steps S108 and S109 are general static elimination processes, and FIG. 6 described below is a static elimination process using the counter voltage according to the present embodiment.
- a predetermined time for obtaining the time integral value Q′off of the current will be described later.
- FIG. 6 is a flowchart showing counter voltage processing.
- the time integral value Q′off of the current flowing from the chuck electrode 40a calculated in step S107 and the current in the state without residual charge stored in the storage unit 120 are stored.
- the difference charge ⁇ Q charged to the chuck electrode 40a by the residual charge is calculated using the equation (3) (S200).
- the upper waveform in FIG. 7 is a waveform of the current flowing through the ammeter 45
- the lower waveform in FIG. 7 indicates the value of the on / off voltage to the chuck electrode 40a at that time.
- the current waveform shown in the upper waveform of FIG. 7 at time T 0 , the voltage that was on from the DC voltage source 42 to the chuck electrode 40a is turned off.
- the ammeter 45 detects the first current peak.
- the reverse voltage is turned on to the chuck electrode 40a from the DC voltage source 42.
- a second current peak appears in the ammeter 45.
- the reverse voltage has been turned on to the chuck electrode 40a from the DC voltage source 42 is turned off.
- a third current peak appears in the ammeter 45.
- Time T 3 is any time after time T 2, which turns off the reverse voltage.
- the time integral value of the current at a predetermined time during the time T 0 -T 1 that flows when the voltage to the chuck electrode 40a after the static elimination process is turned off (time T 0 ) is expressed as the current flowing from the chuck electrode 40a.
- the time integration value Q′off may be used.
- the time integral value of the current at a predetermined time between the times T 2 and T 3 flowing when the reverse voltage is off (time T 2 ) may be set as the time integral value Q′off of the current flowing from the chuck electrode 40a.
- the predetermined time for obtaining the time integral value Q′off of the current is the time until the magnitude of the first current peak or the third current peak is reduced to about 20% to 80%.
- the time integral value of the current at a predetermined time at least during the time T 0 -T 1 or the time integral value at a predetermined time of the current between the time T 2 -T 3 is expressed as the time integral value Q′off of the current.
- the one having a better correlation between the differential charge ⁇ Q and the counter voltage V c may be used.
- time T 4 the voltage is again turned on at the chuck electrode 40a in the plasma processing of the next wafer
- time T 5 the voltage that was turned on at the chuck electrode 40a after the plasma processing is turned off
- time integral value Q'off of the current flowing from the chuck electrode 40a is measured by the predetermined time again ammeter 45 from time T 5 to time T 8. In this way, the time integral value Q′off of the current is measured for each wafer, and the counter voltage feedback control described later is repeated based on the measurement result.
- the processing chamber After calculating the Kaunda voltage V c in step S202, the processing chamber by introducing gas to generate plasma (S204), it turns on the counter voltage V c to the chuck electrode 40a (S206). As a result, the charge on the surface of the electrostatic chuck 40 becomes zero and the residual attracting force between the wafer W and the surface of the electrostatic chuck 40 becomes zero, so that the wafer W can be detached from the electrostatic chuck 40.
- the charge removal process is performed after the process process, and then the counter voltage process is performed. Thereby, the wafer W can be detached from the electrostatic chuck 40.
- the time spent for this feedback control is about 1 second. Therefore, there is no concern of reducing the throughput by executing the counter voltage process. Further, the wafer W can be detached from the electrostatic chuck 40 even in an emergency in which the wafer W is not detached due to a residual charge due to a reverse charge or the like due to residual charges. Furthermore, in the detachment control method according to the present embodiment, since it is possible to know how much attracting force is generated before the wafer W is lifted by the support pins 81, there is a risk of damaging the wafer W. It can be avoided.
- the counter voltage process is executed regardless of the magnitude of the calculated counter voltage, and the wafer W is detached by executing the feedback control. However, if the counter voltage exceeds a predetermined threshold, an abnormality occurs. It may be determined that the operation of the plasma processing apparatus 1 is stopped.
- a gas is introduced into the processing chamber to generate plasma, but the introduced gas is preferably an inert gas. Moreover, you may make it DC discharge instead of producing
- step S212 is added to the counter voltage process of FIG. 6, and a determination process regarding the start condition of the counter voltage process is performed in step S212. All other steps are the same as in FIG.
- step S212 after calculating the differential charge ⁇ Q by executing step S200, it is determined in step S212 whether the differential charge ⁇ Q exceeds a predetermined threshold value. To do. If it is determined that the difference charge ⁇ Q exceeds the threshold value, the counter voltage V c is calculated, and the calculated counter voltage V c is turned on to the chuck electrode 40a (S202 to S210). If it is determined that the difference is equal to or smaller than the threshold value, the present process is terminated without turning on the counter voltage to the chuck electrode 40a.
- the present modification when it is determined that the difference exceeds the threshold value, it is determined that the wafer W is not easily detached due to the residual adsorption force, and it is determined that the charge removal process using the counter voltage is necessary. On the other hand, when it is determined that the difference is equal to or less than the threshold value, the residual attractive force is not so large, and it is determined that the charge removal process using the counter voltage is unnecessary.
- step S212 is a condition for starting the counter voltage processing of the present embodiment.
- the counter voltage process is not performed when the start condition is not satisfied because the electrostatic chuck surface is cleaned.
- the counter voltage processing is not started before the surface of the electrostatic chuck 40 changes and the insulating film 41a exceeds the predetermined thickness, but is automatically started only when the insulating film 41a exceeds the predetermined thickness. . Thereby, useless processing can be omitted and energy saving can be achieved.
- the determination of whether or not the time integral value of the current in step S212 exceeds a predetermined threshold value may be performed in units of wafers (in units of a predetermined number of processed objects) as in this modification. It may be performed in lot units.
- the wafer W can be easily detached from the electrostatic chuck 40 by controlling the counter voltage of the DC voltage source.
- the time until an error that the wafer W cannot be removed can be extended. Thereby, it is possible to reduce the loss of the customer's wafer and improve the operation rate of the apparatus.
- the plasma processing apparatus has a heater 75 divided into three or more zones as shown in the modification of the embodiment of FIG.
- the chuck electrode 40a may be divided.
- the heater 75 may be provided in or near the electrostatic chuck 40.
- the heater 75 is embedded in the electrostatic chuck 40.
- the heater 75 is divided into a central center zone 75a1, a middle zone 75a2 concentrically provided on the outer peripheral side of the center zone 75a1, and an outermost edge zone 75a3.
- the chuck electrode 40a is divided into a center chuck electrode 40a1, a middle chuck electrode 40a2, and an edge chuck electrode 40a3 corresponding to each divided zone of the heater 75.
- a DC voltage source 42a1, a DC voltage source 42a2, and a DC voltage source 42a3 are connected to the center chuck electrode 40a1, the middle chuck electrode 40a2, and the edge chuck electrode 40a3, respectively.
- the center chuck electrode 40a1, middle chuck electrode 40a2, the counter voltage V c for each zone consisting edge chuck electrode 40a3 is calculated.
- the counter voltage V c may be controlled to be turned on only in the outermost edge zone region.
- the plasma processing apparatus may have a dual electrode structure.
- the bipolar electrode and the counter voltage will be described with reference to a modification of the embodiment of FIG. 10.
- the electrostatic chuck 40 includes bipolar chuck electrodes 40a4 and 40a5. That is, two electrodes having the same shape are provided in or on the electrostatic chuck 40.
- the bipolar chuck electrodes 40a4 and 40a5 are charged with charges having different polarities by turning on voltages of opposite polarity.
- the voltage value to turn on each chuck electrode 40a4, 40a5 is usually small. For this reason, there is little electrical damage to the wafer W.
- a DC voltage source 78 and a DC voltage source 79 are connected to the bipolar chuck electrodes 40a4 and 40a5. Accordingly, the counter voltage V c for each chuck electrode 40a4,40a5 twin electrode is calculated. Thus it is possible to adjust the counter voltage V c according to the residual charge states of the electrostatic chuck 40 of each chuck electrode 40A4,40a5.
- plasma etching is described as an example of the plasma processing performed in the plasma processing apparatus, but the present invention is not limited to plasma etching.
- a thin film is formed on the wafer by chemical vapor deposition (CVD: Chemical Vapor Deposition).
- CVD chemical vapor deposition
- the present invention can also be applied to a plasma processing apparatus that performs plasma CVD, plasma oxidation, plasma nitridation, sputtering, ashing, and the like.
- the plasma processing apparatus is not limited to a capacitively coupled plasma processing apparatus that generates capacitively coupled plasma (CCP: CapacitivelyitiveCoupled Plasma) by high-frequency discharge generated between parallel plate electrodes in the chamber.
- CCP capacitively coupled plasma
- An inductively coupled plasma processing device that generates an inductively coupled plasma (ICP) under a high frequency induction electromagnetic field by placing an antenna on or around the surface of the substrate, generates plasma waves using microwave power
- ICP inductively coupled plasma
- the present invention can also be applied to a microwave plasma processing apparatus.
- the object to be processed in the present invention is not limited to a semiconductor wafer, and may be, for example, a large substrate for a flat panel display (FPD: Flat Panel Display), an EL element, or a substrate for a solar cell. .
- FPD Flat Panel Display
- EL element Organic Electrode
- the current measured for the predetermined time may be a current that flows immediately after the voltage that is turned on to the chuck electrode is turned off.
- the current measured for the predetermined time may be a current that flows immediately after the reverse voltage is turned on and the reverse voltage is turned off.
- the time integral value of the current measured for the predetermined time may be measured by an ammeter provided between the chuck electrode and the DC voltage source.
- the method may further include a step of determining whether or not the difference exceeds a predetermined threshold value. When it is determined that the difference exceeds the threshold value, the counter voltage may be turned on to the chuck electrode.
- the determination as to whether or not the difference exceeds a predetermined threshold value may be performed in units of lots or in units of a predetermined number of processed objects.
- a heater is provided in or near the electrostatic chuck, the heater is divided into a plurality of zones, a chuck electrode and a DC voltage source are provided for each zone, and the counter is provided for each chuck electrode of each zone. A voltage may be calculated and the chuck electrode for each zone may be turned on.
- the chuck electrode may be divided into two electrodes, a DC voltage source may be provided for each of the two electrodes, the counter voltage of each of the two electrodes may be calculated, and each of the two electrodes may be turned on.
- the predetermined time may be selected from a range of time until the magnitude of the peak of the current flowing from the chuck electrode becomes 20% to 80% after the voltage turned on to the chuck electrode is turned off.
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Abstract
Description
まず、本発明の一実施形態に係るプラズマ処理装置の全体構成について、図1を参照しながら説明する。
次に、一実施形態に係るウエハの離脱制御に用いるカウンタ電圧の原理を、図2を参照しながら説明する。図2の「S1」は、絶縁膜が形成される前の静電チャックの状態を示し、図2の「S2」は、絶縁膜が形成された後の静電チャックの残留吸着状態を示し、図2の「S3」は、はカウンタ電圧をオンしたときの静電チャックの状態を示す。
次に、一実施形態に係るウエハWの離脱制御に用いるカウンタ電圧の決定方法について説明する。上述のカウンタ電圧の原理で説明したように絶縁膜41aに溜まったマイナスの残留電荷の総量に比例してそれとつり合うようにチャック電極40aにプラスの電荷が蓄積される。
ここでV1の値がわかっているのでウエハWとチャック電極40aとの間の静電容量Coは式(2)のように求めることができる。
残留電荷がある状態の静電チャック40の場合、チャック電極40aの電圧をオフしても残留電荷とつり合うための電荷がチャック電極40aに残る。よって、その分だけ電圧をオフにしたときに所定の時間流れる電流の時間積分値Q’offが減少するので時間積分値Qoffとの差分を式(3)を計算することにより求める。求めた値が残留電荷の影響によりチャック電極40aにチャージされる差分の電荷ΔQとなる。
この差分の電荷ΔQは残留電荷量に比例するのでこの差分の電荷ΔQから残留電荷の総量Qとの相関関係を後述のカウンタ電圧の実験で予め求めておけば式(2)で求めた静電容量Coを用いてカウンタ電圧Vcを式(4)のように決定することができる。つまり、差分の電荷ΔQとカウンタ電圧Vcとの相関関係を求めることができる。
[カウンタ電圧の実験]
次に、一実施形態に係るウエハの離脱制御に用いる残留電荷によりチャック電極40aにチャージされる差分の電荷ΔQと残留電荷の総量Qとの相関関係からカウンタ電圧Vcを求める実験を、図3を参照しながら説明する。図3は一実施形態に係る測定装置を示す。
制御装置100は、プラズマ処理装置1を制御する。ここでは、静電チャック40からウエハWを離脱させるための制御方法を実行する制御装置100の機能を中心に説明する。図4に示した制御装置100は、プロセス実行部105、取得部110、制御部115及び記憶部120を有する。
まず、ウエハWが処理室内へ搬入され、プラズマ処理が開始されると、プロセスガスが導入され、処理室内が所定の圧力に維持される(S100)。次に、高周波電力を処理室内に導入しプラズマを発生させる(S101)。プラズマ発生後、チャック電極40aに電圧をオンしウエハを静電吸着させる(S102)。その後、ウエハ裏面と静電チャック40表面との間に伝熱ガスを供給し、その状態で所定時間プラズマ処理を行う(S103)。プラズマ処理が終了したら、プロセスガス及び高周波電力をオフし(S104)、伝熱ガスの供給をオフし(S105)、処理室内に不活性ガスを導入し、所定の第1の圧力(100mTorr~400mTorr)に維持する(S106)。次に、チャック電極40aの電圧をオフした後、チャック電極40aから流れる電流の時間積分値Q’offを所定時間測定する(S107)。
以上の実施形態では、無条件にすべてのウエハWについて、カウンタ電圧処理にてフィードバック制御を行ったが、開始条件を満たした場合にカウンタ電圧処理を行い、開始条件を満たさない場合にはカウンタ電圧処理を行わないようにしてもよい。
10 処理容器
12 載置台(下部電極)
28 排気装置
32 高周波電源
38 シャワーヘッド(上部電極)
40 静電チャック
40a チャック電極
41a 絶縁膜
42 直流電圧源
43 スイッチ
44 接地部
45 電流計
52 伝熱ガス供給源
62 ガス供給源
71 チラーユニット
75 ヒ-タ
81 支持ピン
84 モータ
100 制御装置
105 プロセス実行部
110 取得部
115 制御部
120 記憶部
200 測定装置
202 イオナイザー
204 電流計
206 表面電位計
Claims (10)
- チャック電極を有し、被処理体を静電吸着する静電チャックから被処理体を離脱させるための離脱制御方法であって、
前記被処理体のプラズマ処理後に前記チャック電極にオンした電圧をオフした後に前記チャック電極から流れる電流を所定時間測定した結果から電流の時間積分値を取得する工程と、
プラズマ処理中に前記チャック電極に電圧をオンしたときにチャージされる所定の電荷量と前記取得した電流の時間積分値との差分を算出する工程と、
前記差分から前記静電チャックの残留電荷量に応じたカウンタ電圧を算出する工程と、
前記カウンタ電圧を前記チャック電極にオンする工程と、
前記カウンタ電圧をオンした後、被処理体を支持する支持ピンを上昇させ前記被処理体を前記チャック上から離脱し、前記カウンタ電圧をオフする工程と、
を含むことを特徴とする離脱制御方法。 - 前記所定時間測定する電流は、前記チャック電極にオンした電圧をオフした直後に流れる電流であることを特徴とする請求項1に記載の離脱制御方法。
- 前記所定時間測定する電流は、前記チャック電極に逆電圧をオン、該逆電圧をオフした直後に流れる電流であることを特徴とする請求項1に記載の離脱制御方法。
- 前記所定時間測定する電流の時間積分値は、前記チャック電極及び前記直流電圧源間に設けられた電流計により測定されることを特徴とする請求項1に記載の離脱制御方法。
- 前記差分が予め定められた閾値を超えるか否かを判定する工程を更に含み、
前記閾値を超えたと判定された場合、前記カウンタ電圧を前記チャック電極にオンすることを特徴とする請求項1に記載の離脱制御方法。 - 前記差分が予め定められた閾値を超えるか否かの判定は、ロット単位又は所定の被処理体の処理枚数単位で行われることを特徴とする請求項5に記載の離脱制御方法。
- 前記静電チャック内または近傍にヒ-タが設けられ、
前記ヒ-タは複数のゾーンに分割され、
ゾーン毎にチャック電極と直流電圧源とが設けられ、
各ゾーンのチャック電極毎に前記カウンタ電圧を算出し、前記ゾーン毎のチャック電極にオンすることを特徴とする請求項1に記載の離脱制御方法。 - 前記チャック電極は双電極に分割され、
双電極にそれぞれ直流電圧源が設けられ、
前記双電極のそれぞれの前記カウンタ電圧を算出し、前記双電極にそれぞれオンすることを特徴とする請求項1に記載の離脱制御方法。 - 前記所定時間は前記チャック電極にオンした電圧をオフした後に前記チャック電極から流れる電流のピークの大きさが20%~80%になるまでの時間の範囲から選ばれることを特徴とする請求項1に記載の離脱制御方法。
- チャック電極を有し、被処理体を静電吸着する静電チャックを有するプラズマ処理装置の制御装置であって、
前記被処理体のプラズマ処理後に前記チャック電極にオンした電圧をオフした後に前記チャック電極から流れる電流を所定時間測定した結果から電流の時間積分値を取得する取得部と、
プラズマ処理中に前記チャック電極に電圧をオンしたときにチャージされる所定の電荷量と前記取得した電流の時間積分値との差分を算出し、前記差分から前記静電チャックの残留電荷量に応じたカウンタ電圧を算出し、前記カウンタ電圧を前記チャック電極にオンし、前記カウンタ電圧をオンした後、被処理体を支持する支持ピンを上昇させ前記被処理体を前記チャック上から離脱し、前記カウンタ電圧をオフする制御部と、
を備えることを特徴とする制御装置。
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JP2011040658A (ja) * | 2009-08-17 | 2011-02-24 | Fujitsu Semiconductor Ltd | 処理物保持装置、静電チャックの制御方法及び半導体装置の製造方法 |
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KR20140128953A (ko) | 2014-11-06 |
US20150303092A1 (en) | 2015-10-22 |
US9466519B2 (en) | 2016-10-11 |
TWI613720B (zh) | 2018-02-01 |
TW201349339A (zh) | 2013-12-01 |
JP6013740B2 (ja) | 2016-10-25 |
KR102033807B1 (ko) | 2019-10-17 |
JP2013161899A (ja) | 2013-08-19 |
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