WO2013046640A1 - プラズマ処理装置及びプラズマ処理方法 - Google Patents
プラズマ処理装置及びプラズマ処理方法 Download PDFInfo
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- WO2013046640A1 WO2013046640A1 PCT/JP2012/006086 JP2012006086W WO2013046640A1 WO 2013046640 A1 WO2013046640 A1 WO 2013046640A1 JP 2012006086 W JP2012006086 W JP 2012006086W WO 2013046640 A1 WO2013046640 A1 WO 2013046640A1
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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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- 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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- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
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- H01J2237/32—Processing objects by plasma generation
- H01J2237/33—Processing objects by plasma generation characterised by the type of processing
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Definitions
- the present invention relates to a plasma process used for fine processing of a substrate to be processed such as a semiconductor wafer, and more particularly to a capacitively coupled plasma processing apparatus and a plasma processing method.
- RF radio frequency
- microwaves are used to discharge or ionize a processing gas in a vacuum processing container.
- an upper electrode and a lower electrode are arranged in parallel in a processing container, and typically a substrate to be processed (semiconductor wafer, glass substrate, etc.) on the lower electrode.
- a high frequency with a frequency suitable for plasma generation (usually 13.56 MHz or more) is applied to the upper electrode or the lower electrode. Electrons are accelerated by the high frequency electric field generated between the two electrodes facing each other by the application of the high frequency, and plasma is generated by impact ionization of the electrons and the processing gas.
- a thin film is deposited on the substrate or a material or thin film on the substrate surface is shaved by a gas phase reaction or surface reaction of radicals and ions contained in the plasma.
- Patent Document 1 a technique for applying a negative DC (direct current) voltage to a counter electrode (usually an upper electrode) facing a substrate across a processing space has attracted attention.
- the upper DC application method as described above is often used for HARC (High Aspect Ratio Contact) processes.
- the HARC process is a technique for forming thin and deep contact holes or via holes by plasma etching in an oxide film (usually a silicon oxide film) of an insulating layer in a wiring formation process of LSI manufacturing.
- a fluorocarbon-based gas is used as an etching gas
- the upper electrode A silicon-containing material such as silicon or SiC is used as the base material.
- anisotropy and selectivity can be greatly improved based on the effects (1) and (3). More specifically, due to the effect (1), deposits (mainly fluorocarbon polymer films) sputtered on the surface of the upper electrode accumulate on the surface of the resist mask to prevent the surface of the resist mask from being rough. Furthermore, the silicon sputtered from the base material of the upper electrode reacts with the fluorine radicals and is exhausted as a highly volatile reaction product (SiF 4 ), thereby reducing fluorine that lowers anisotropy and selectivity. Can be reduced (fluorine scavenging effect). In addition, due to the effect (3) above, high-energy electrons are injected into the resist mask on the substrate surface, so that the composition of the resist mask surface layer is modified and the etching resistance (plasma resistance) is enhanced.
- the effect of the above (4) by the upper DC application method is the control of the direction in which the plasma potential is lowered. That is, in order to bring out any of the other effects (1) to (3), (5), and (6) as desired, the larger the absolute value of the negative DC voltage applied to the upper electrode, the closer to the chamber sidewall. The plasma potential of becomes low. However, this reduces the effect of removing deposits adhering to the chamber sidewall by ion irradiation sputtering. This is also an issue.
- the present invention solves the problems of the prior art as described above, and provides a plasma processing apparatus and a plasma processing method that follow the advantages of the upper DC application method and can eliminate the disadvantages of the upper DC application method. .
- the plasma processing apparatus of the present invention includes a processing container that can be evacuated, a first electrode that is placed in the processing container and supports a substrate to be processed, and the first electrode in the processing container and a predetermined electrode.
- a second electrode arranged in parallel with a gap therebetween, a processing gas supply unit for supplying a desired processing gas to a processing space between the first and second electrodes in the processing container, and the processing gas
- a first high-frequency power source that applies a first high-frequency wave having a frequency suitable for generating plasma to discharge plasma to the first electrode, and a low-frequency or high-frequency wave having a frequency that ions in the plasma can follow
- An AC power source for applying an AC current to the second electrode; and a blocking capacitor connected between the AC power source and the second electrode.
- the ion energy is maximized when the AC voltage level is minimized, and the ion energy is minimized when the AC voltage level is maximized.
- the ion energy distribution is a distribution in which there are many ions near the maximum energy and the minimum energy because many ions are incident on the electrode in a time zone where the time change of the voltage is small (around the maximum or minimum).
- the frequency of the alternating current applied to the second electrode is higher than the ion plasma frequency, the followability of ions decreases, and the higher the alternating frequency, the narrower the energy band width in the ion energy distribution. Go. That is, the ion energy is reduced in fluctuation and averaged toward the center value corresponding to the self-bias voltage. As a result, the maximum value of ion energy decreases.
- the sputtering rate is more dependent on the magnitude (maximum value) of ion energy than the number of incident ions. Therefore, even when the absolute value or amplitude of the power supply voltage applied to the second electrode is the same, the method of the present invention (AC application method) is more effective than the conventional upper DC application method. Since the maximum energy of ions incident on the electrode is remarkably large, the sputtering rate in the second electrode can be improved more efficiently.
- the potential of the second electrode becomes higher than the self-bias voltage, and the plasma potential is raised accordingly, and the chamber The plasma potential in the vicinity of the side wall becomes high on a time average.
- the sputtering effect for removing deposits adhering to the chamber side wall is also improved, and deposits on the chamber side wall can be efficiently removed.
- the plasma etching method of the present invention is a plasma etching method for forming a high aspect ratio hole in a silicon oxide film on a substrate to be processed, wherein a first electrode and a second electrode are spaced apart from each other at a predetermined interval. And placing the substrate to be processed on the first electrode in a vacuumable processing vessel disposed in parallel, evacuating the processing vessel to a predetermined pressure, and Fluorocarbon-based etching gas is supplied to a processing space between one electrode and the second electrode, and a first high frequency is applied to the first electrode to generate plasma of the etching gas in the processing space. And a step of applying a low-frequency or high-frequency alternating current having a frequency that can be followed by ions in plasma to the second electrode via a blocking capacitor.
- the in-plane uniformity of the etching rate can be improved while ensuring a mask selection ratio equivalent to that of the conventional upper DC application method. Can do.
- the above-described configuration and operation can follow the advantages of the conventional DC application method and can eliminate the disadvantages of the DC application method.
- FIG. 6 is a plot diagram showing the correlation between the top CD and the Low-k damage amount obtained from the result of the first experiment.
- FIG. 10 is a plot diagram showing the correlation between the top CD and the Low-k damage amount obtained from the result of the second experiment.
- Is a diagram illustrating a - (lower V L characteristic N e) correlation between self-bias voltage V L generated in the electron density N e and the lower electrode in the processing space in the upper DC application type.
- Is a diagram illustrating a - (lower V L characteristic N e) correlation between self-bias voltage V L generated in the electron density N e and the lower electrode in the processing space in the upper AC application type.
- It is a plot figure which shows the correlation of the upper electrode applied voltage or electric power obtained by experiment of one Example, and plasma potential.
- It is a figure (SEM photograph) which shows the experimental result of the ArF resist modification process in an upper AC application system and an upper DC application system.
- FIG. 1 shows the configuration of a plasma processing apparatus in one embodiment of the present invention.
- This plasma processing apparatus is configured as a capacitive coupling type (parallel plate type) plasma etching apparatus of a lower two high-frequency superimposition application method, for example, a cylindrical vacuum chamber made of aluminum whose surface is anodized (anodized). (Processing container) 10 is provided. The chamber 10 is grounded.
- a cylindrical susceptor support 14 is disposed at the bottom of the chamber 10 via an insulating plate 12 such as ceramic, and a susceptor 16 made of, for example, aluminum is provided on the susceptor support 14.
- the susceptor 16 constitutes a lower electrode, on which, for example, a semiconductor wafer W is placed as a substrate to be processed.
- An electrostatic chuck 18 for holding the semiconductor wafer W is provided on the upper surface of the susceptor 16.
- the electrostatic chuck 18 is obtained by sandwiching an electrode 20 made of a conductive film between a pair of insulating layers or insulating sheets, and a DC power source 22 is electrically connected to the electrode 20.
- the semiconductor wafer W can be held on the electrostatic chuck 18 by an electrostatic attraction force by a direct current voltage from the direct current power source 22.
- a focus ring 24 made of, for example, silicon is disposed on the upper surface of the susceptor 16 around the electrostatic chuck 18 to improve etching uniformity.
- a cylindrical inner wall member 25 made of, for example, quartz is attached to the side surfaces of the susceptor 16 and the susceptor support base 14.
- a refrigerant chamber 26 extending in the circumferential direction is provided.
- a refrigerant of a predetermined temperature for example, cooling water
- the processing temperature of the semiconductor wafer W on the susceptor 16 can be controlled by the temperature of the refrigerant.
- a heat transfer gas such as He gas from a heat transfer gas supply mechanism (not shown) is supplied between the upper surface of the electrostatic chuck 18 and the back surface of the semiconductor wafer W via the gas supply line 28.
- the susceptor 16 is electrically connected to first and second high-frequency power sources 30 and 32 via matching units 34 and 36, blocking capacitors 38 and 40, and power feeding rods 42 and 44, respectively.
- the power feeding rods 42 and 44 are individually shown in FIG. 1, they may be common or the same power feeding rod.
- the first high frequency power supply 30 outputs a high frequency RF H of a certain frequency, for example, 40 MHz, mainly contributing to plasma generation.
- the second high frequency power supply 32 outputs a high frequency RF L of a certain frequency, for example, 13 MHz, which mainly contributes to the drawing of ions into the semiconductor wafer W on the susceptor 16.
- the upper electrode 46 is provided above the susceptor 16 so as to face the susceptor in parallel.
- the upper electrode 46 includes an electrode plate 48 made of a silicon-containing material such as Si or SiC having a large number of gas ejection holes 48a, and a conductive material that detachably supports the electrode plate 48, such as aluminum whose surface is anodized. And is attached to the chamber 10 in an electrically floating state via a ring-shaped insulator 52.
- a plasma generation space or a processing space PS is formed between the upper electrode 46 and the susceptor 16.
- the ring-shaped insulator 52 is made of, for example, alumina (Al 2 O 3 ), and is attached so as to hermetically close a gap between the outer peripheral surface of the upper electrode 46 and the side wall of the chamber 10, and physically connects the upper electrode 34. I support it.
- the electrode support 50 has a gas buffer chamber 54 therein, and a plurality of gas vent holes 50a communicating from the gas buffer chamber 54 to the gas ejection holes 48a of the electrode plate 48 on the lower surface thereof.
- a processing gas supply source 58 is connected to the gas buffer chamber 54 via a gas supply pipe 56.
- the gas supply pipe 56 is provided with a mass flow controller (MFC) 60 and an open / close valve 62.
- MFC mass flow controller
- etching gas etching gas
- the processing gas enters the processing space PS from the gas ejection holes 48 a of the electrode plate 48 toward the semiconductor wafer W on the susceptor 16. Is ejected like a shower.
- the upper electrode 34 also serves as a shower head for supplying the processing gas to the processing space PS.
- a passage (not shown) through which a coolant such as cooling water flows is provided inside the electrode support 50, and the entire upper electrode 46, in particular, the electrode plate 48 is kept at a predetermined temperature via the coolant by an external chiller unit. It is supposed to adjust the temperature. Further, in order to further stabilize the temperature control for the upper electrode 46, a configuration in which a heater (not shown) made of a resistance heating element is attached to the inside or the upper surface of the electrode support 50 is also possible.
- This capacitively coupled plasma processing apparatus includes an AC power supply 64 outside the chamber 10.
- An output terminal of the AC power supply 64 is electrically connected to the upper electrode 46 via a matching unit 66, a blocking capacitor 68, and a DC power supply line or power supply rod 70.
- the AC power supply 64 outputs an AC having a frequency f that can be followed by ions in the plasma, that is, a low frequency or a high frequency AC AC lower than the ion plasma frequency, so that the power, voltage peak value, or effective value can be varied. It has become.
- a ring-shaped DC ground part made of a conductive member such as Si or SiC is used. (Not shown) is attached. This DC ground part is always grounded via a ground line (not shown).
- An annular space formed between the susceptor 16 and the susceptor support 14 and the side wall of the chamber 10 is an exhaust space, and an exhaust port 72 of the chamber 10 is provided at the bottom of the exhaust space.
- An exhaust device 76 is connected to the exhaust port 72 via an exhaust pipe 74.
- the exhaust device 76 has a vacuum pump such as a turbo molecular pump, and can depressurize the interior of the chamber 10, particularly the processing space PS, to a desired degree of vacuum.
- a gate valve 80 for opening and closing the loading / unloading port 78 for the semiconductor wafer W is attached to the side wall of the chamber 10.
- the control unit 82 includes a microcomputer, and in accordance with software (program) and recipe information stored in an external memory or internal memory, each unit in the apparatus, in particular, the high frequency power supplies 30 and 32, the AC power supply 64, and the matching units 34 and 36. , 66, MFC 60, opening / closing valve 62, exhaust device 76, and the like, and the overall operation (sequence) of the device.
- processing gas that is, etching gas (generally mixed gas) is introduced into the chamber 10 from the processing gas supply source 58 at a predetermined flow rate and flow rate ratio, and the pressure in the chamber 10 is set to a set value by vacuum evacuation by the exhaust device 76.
- etching gas generally mixed gas
- the first and second high frequency power sources 30 and 32 superimpose the first high frequency (40 MHz) and the second high frequency (13 MHz) on the susceptor 16 with predetermined power, respectively.
- a DC voltage is applied from the DC power source 22 to the electrode 20 of the electrostatic chuck 18 to fix the semiconductor wafer W on the electrostatic chuck 18.
- the etching gas discharged from the shower head of the upper electrode 46 is discharged under a high-frequency electric field between the electrodes 46 and 16, and plasma is generated in the processing space PS.
- the film to be processed on the main surface of the semiconductor wafer W is etched by radicals and ions contained in the plasma.
- this capacitively coupled plasma etching apparatus by applying a first high frequency having a relatively high frequency suitable for plasma generation to the susceptor 12, the plasma is densified in a preferable dissociation state, and the high density plasma is obtained even under lower pressure conditions. Can be formed.
- anisotropic etching can be performed on the film to be processed of the semiconductor wafer W by applying a second high frequency wave having a relatively low frequency suitable for ion attraction to the susceptor 12.
- a blocking capacitor 68 is supplied from an AC power supply 64 in a lower two high frequency superimposing application method in which two high frequency RF H and RF L for generating a plasma and for attracting ions are applied to a lower electrode (susceptor) 16.
- the AC AC has a frequency f that the ions in the plasma can follow, that is, a frequency f lower than the ion plasma frequency, and the AC power source 64 can vary its power, voltage peak value, or effective value.
- the ion plasma frequency f pi is given by the following equation (1).
- f pi (e 2 n o / ⁇ 0 m i) 1/2 / 2 ⁇ ⁇ (1)
- e electron charge amount
- n o the plasma density
- epsilon 0 the dielectric constant in vacuum
- m i the mass of the ion.
- n o is 1 ⁇ 10 9 cm -3
- ion plasma frequency f pi is approximately 1 MHz.
- n o is the time of 4 ⁇ 10 9 cm -3
- f pi is about 2MHz.
- n o is 1 ⁇ 10 10 cm -3
- f pi is approximately 3 MHz.
- FIG. 2 shows the potential distribution between the upper electrode 46 and the lower electrode (susceptor) 16 and the ion energy distribution of ions incident on the upper electrode 46 in this capacitively coupled plasma etching apparatus.
- a negative DC voltage that is, a self-bias voltage V B is generated in the upper electrode 46, and this self-bias voltage is generated.
- the AC AC voltage (instantaneous value) is superimposed on V B.
- the self-bias voltage V B becomes a value close to the voltage peak value of the AC AC.
- the potential of the upper electrode 46 changes periodically with the AC AC voltage level (instantaneous value) overlapping the self-bias voltage V B.
- the ion energy distribution is a distribution in which there are many ions near the maximum energy and the minimum energy because many ions are incident on the electrode in a time zone where the time change of the voltage is small (around the maximum or minimum). become.
- the maximum negative potential is obtained by adding the self-bias voltage V B and the AC AC voltage peak value. Many corresponding maximum energy ions are incident on the upper electrode 46.
- the frequency f of AC AC is higher than the ion plasma frequency f pi , the followability of ions decreases, and as the AC frequency f is increased, the energy in the ion energy distribution (IED) as shown in FIG. The band becomes narrower. That is, the ion energy is reduced in fluctuation and averaged toward the center value corresponding to the self-bias voltage V B. As a result, the maximum value of ion energy decreases.
- FIG. 3 shows a potential distribution when a negative DC voltage V dc is applied to the upper electrode 46 by the DC power source 84 according to the conventional upper DC application method as a comparative example with respect to the AC application method, and is incident on the upper electrode 46.
- the ion energy distribution of ions is shown.
- the ion energy distribution (IED) has a profile in which the energy of all incident ions is within an energy band having a local width corresponding to the DC voltage V dc . Therefore, during the plasma process, ions that fall in a constant and constant energy band are incident on the upper electrode 46 at a substantially constant rate.
- the sputtering rate largely depends on the magnitude (maximum value) of ion energy rather than the number of incident ions. Therefore, even if the absolute value or amplitude of the power supply voltage applied to the upper electrode 46 is the same, the upper AC application method of the present invention causes ions having higher energy to be generated in the upper electrode than the upper DC application method. 46 is incident. Therefore, the upper AC application method of the present invention can improve the sputtering rate in the upper electrode 46 more efficiently.
- the plasma potential is lowered to the lower side.
- the potential of the upper electrode 46 in the half cycle in which the AC AC voltage level is positive, the potential of the upper electrode 46 becomes higher than the self-bias voltage V B , and the plasma is accordingly increased. Potential is also raised. In particular, the plasma potential near the side wall of the chamber rises to a considerably high value near the voltage level of the AC AC.
- the plasma potential in the vicinity of the side wall of the chamber 10 is considerably higher in time average than the upper DC application method, and ions incident on the side wall of the chamber 10 from the plasma Energy will be greatly increased.
- the sputtering effect which removes the deposit adhering to the chamber side wall is also greatly improved.
- the process reproducibility and the mass productivity of the apparatus can be improved.
- the present inventor conducted an experiment comparing the upper AC application method of the present invention with the conventional upper DC application method in the HARC process using the plasma etching apparatus of this embodiment (FIG. 1).
- 5A and 5B show the in-wafer distribution characteristics of the etching rate (E / R) of the silicon oxide film (film to be etched) and the photoresist (mask) as the results of the upper AC application method, respectively.
- FIGS. 6A and 6B show the in-wafer distribution characteristics of the etching rate (E / R) of the silicon oxide film and the photoresist as the experimental results of the upper DC application method, respectively.
- the main process conditions in this HARC process experiment are as follows.
- the etching rate distribution characteristics of the photoresist (PR) are not significantly different between the upper AC application method and the upper DC application method, and both have a low and flat profile.
- the upper AC application method exhibits the above effects (1) and (3) sufficiently even in the HARC process, and the upper DC application method also applies the upper AC application. The same effects (1) and (3) as the system are achieved.
- the profiles of the silicon oxide film (SiO 2 ) are clearly different from each other with respect to the etching rate distribution characteristics. That is, in the profile of the upper DC application method, as the absolute value of the DC voltage V dc is increased, the etching rate at the wafer center is higher than the etching rate at the wafer edge, and the wafer center is remarkably increased. . In short, as the applied voltage (absolute value) of the upper DC is increased, the in-plane uniformity of the SiO 2 etching rate is deteriorated.
- the higher the AC AC power the higher the etching rate at the wafer center part becomes higher than the etching rate at the wafer edge part, but the wafer center part relatively increases. Not so high. That is, the in-plane uniformity of the SiO 2 etching rate is improved.
- the difference in the in-plane uniformity of the SiO 2 etching rate in the HARC process between the upper DC application method and the upper AC application method is considered to be due to the difference in the effect (6). That is, in the upper DC application method, the effect of the above (6) is undesirably enhanced by increasing the absolute value of the DC voltage V dc , whereas in the upper AC application method, the above-described effect can be obtained even if the AC power is increased. It is considered that the effect of (6) is not as strong as the upper DC application method.
- the main adjustment knob can control the etching rate characteristics.
- the selectivity is such that the voltage value (absolute value) of the DC voltage V dc is the upper DC application method as described above, and the AC power (or AC voltage peak value, effective value, etc.) is the upper AC application method.
- the first adjustment knob and the second adjustment knob are as independent as possible. Therefore, when the mask selection ratio is changed using the second adjustment knob, even if the etching rate characteristic (for example, in-plane uniformity) changes under the influence, the change amount is as small as possible. preferable.
- the independence between the first and second adjustment knobs it can be seen that the upper AC application method is superior to the upper DC application method, as shown in FIG.
- FIG. 8 shows an SEM photograph used for measuring the etching shape.
- FIG. 9 shows the correlation between the mask selection ratio and the bowing amount by comparing the upper AC application method and the upper DC application method.
- the bowing amount is a difference between the maximum diameter (Boeing CD) in the fine hole formed in the silicon oxide film and the top end diameter (Top CD). The smaller the bowing amount, the better the vertical machining shape.
- the present inventor conducted two experiments using the plasma etching apparatus of this embodiment (FIG. 1) to compare the upper AC application method of the present invention with the conventional upper DC application method in the BEOL process.
- the BEOL process is a technique for forming a relatively shallow via hole in an interlayer insulating film by plasma etching in a wiring formation process of LSI manufacturing.
- an organic low-k film is often used as an interlayer insulating film to be processed.
- the damage amount of the organic low-k films 92 and 94 is added to the evaluation items of the first and second experiments.
- the SiOC organic film is damaged by plasma etching, the composition of the portion is changed to SiO and becomes soluble in the HF solution. Therefore, after the etching is completed, the sample semiconductor wafer is immersed in an HF solution for 30 seconds, whereby the dimension (increase amount of the bowing CD) in which the inner walls of the organic low-k films 92 and 94 are formed in the etching hole 100 is set to Low. -Measured as k damage.
- FIG. 11 shows a cross-sectional view (SEM photograph) of patterns obtained in the first experiment of the BEOL process and measured values of various evaluation items.
- the top CD decreases and the amount of low-k damage increases as the absolute value of the DC voltage V dc increases in the upper DC application method and as the AC power increases in the upper AC application method.
- the tendency is stronger in the upper AC application method than in the upper DC application method.
- the amount of low-k damage allowed in this type of BEOL process is 5 nm or less, both systems use a low voltage (low power) region.
- FIG. 12 shows a cross-sectional view (SEM photograph) of the pattern obtained in the second experiment of the BEOL process and measured values of various evaluation items.
- the top CD decreases as the absolute value of the DC voltage V dc increases in the upper DC application method, and the AC power increases in the upper AC application method. The amount increases.
- the depth is 155 nm
- the top CD is 51 nm
- the Boeing CD is 51 nm.
- Another plasma etching experiment was performed under the same process conditions as in the first experiment. Then, based on the experimental results, as shown in FIGS. 15 and 16, and the electron density in the processing space PS generated (plasma density) N e and the lower electrode 16 self-bias voltage V L (lower V L) Correlation, that is, the N e -lower VL characteristic was obtained.
- the upper AC application method has a lower N e / It can be seen that the process margin can be expanded in the region of the lowered portion V L.
- a region of the low N e / reduction portion V L is suitable for a process of etching an insulator thin film of, for example, an MRAM (Magnetroresistive Random Access Memory) at a low speed.
- FIG. 17 shows the experimental results.
- the plasma potential near the side wall of the chamber decreases as the absolute value of the DC voltage V dc increases, whereas the upper AC application method increases the AC AC power. It was verified that the plasma potential in the vicinity of the side wall of the chamber increases as the time increases. This is because, as described above, in the upper DC application method, the potential of the upper electrode 46 is fixed to the negative DC voltage V dc and the plasma potential is lowered.
- the potential of the upper electrode 46 in the half cycle in which the AC AC voltage level is positive, the potential of the upper electrode 46 becomes higher than the self-bias voltage V B , thereby raising the plasma potential. As a result, the plasma potential near the side wall of the chamber rises.
- the inventor conducted an experiment comparing the upper AC application method of the present invention with the conventional upper DC application method for the effect of modifying the ArF resist as an etching mask under plasma.
- the main process conditions are as follows.
- High frequency power: 40MHz / 13MHz 300 / 0W
- AC frequency: AC 380 kHz
- FIG. 18 shows the experimental results of the ArF resist modification process as SEM photographs.
- the upper AC application method of the present invention follows the advantages of the conventional upper DC application method in the BEOL process and the ArF resist modification effect, for example, and eliminates the disadvantages of the upper DC application method in the HARC process, for example. can do.
- the value of AC AC frequency f (380 kHz) in the above embodiment is an example, and an arbitrary frequency f that can be followed by ions can be used for AC AC. Therefore, the frequency f of the AC AC in the present invention may be a frequency higher than 380 kHz in the above-described embodiment, and is generally a limit of a frequency that can be followed by ions (a frequency that can give energy to ions from another viewpoint).
- the frequency region up to 13 MHz can be used.
- the matching unit 66 is used to apply the AC AC output from the AC power source 64 to the upper electrode 46 with the maximum power transmission efficiency.
- the matching unit 66 can be omitted.
- a configuration in which the second high-frequency RF L is not applied to the lower electrode (susceptor) 16, that is, a configuration in which the high-frequency power source 32, the matching unit 40, and the blocking capacitor 40 are omitted is possible.
- the showerhead structure in the upper electrode 46 can be arbitrarily modified.
- the present invention is not limited to a capacitively coupled plasma etching apparatus, but can be applied to a capacitively coupled plasma processing apparatus that performs an arbitrary plasma process such as plasma CVD, plasma ALD, plasma oxidation, plasma nitridation, and sputtering.
- the substrate to be treated in the present invention is not limited to a semiconductor wafer, and a flat panel display, organic EL, various substrates for solar cells, a photomask, a CD substrate, a printed substrate, and the like are also possible.
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Abstract
Description
[プラズマ処理装置の構成]
[実施形態における上部AC印加方式の基本的作用]
fpi=(e2no/ε0mi)1/2/2π ・・・・(1)
ただし、eは電子の電荷量、noはプラズマ密度、ε0は真空中の誘電率、miはイオンの質量である。
[HARCプロセスに関する実施例]
レジスト : アクリレートベース用のArFレジスト
処理ガス: C4F6/C4F8/Ar/O2=20/35/500/36sccm
チャンバ内の圧力 : 20mTorr
温度 : 上部電極/チャンバ側壁/下部電極=60/60/40℃
高周波電力 : 40MHz/13MHz=1000/4500W
交流周波数 : AC=380kHz
交流電力: AC=0W,250W,500W,1000W
直流電圧: Vdc=0V,-150V,-300V,-450V,-600V
[BEOLプロセスに関する実施例]
処理ガス: C4F8/Ar/N2/O2=30/1200/70/17sccm
チャンバ内の圧力 : 80mTorr
温度 : 上部電極/チャンバ側壁/下部電極=60/60/60℃
交流周波数 : AC=380kHz
交流電力: AC=0W,250W,500W
直流電圧: Vdc=0V,-300V,-700V
[その他の実施例]
処理ガス: H2/Ar=100/800sccm
チャンバ内の圧力 : 50mTorr
温度 : 上部電極/チャンバ側壁/下部電極=60/60/30℃
高周波電力 : 40MHz/13MHz=300/0W
交流周波数 : AC=380kHz
交流電力: AC=0W,250W,500W
直流電圧: Vdc=0V,-300V,-700V
処理時間 : 30秒
16 サセプタ(下部電極)
30 (プラズマ生成用の)高周波電源
32 (イオン引き込み用の)高周波電源
46 上部電極
58 処理ガス
64 交流電源
68 ブロッキングコンデンサ
82 制御部
Claims (8)
- 真空排気可能な処理容器と、
前記処理容器内に配置され、被処理基板を載せて支持する第1の電極と、
前記処理容器内に前記第1の電極と所定の間隔を空けて平行に配置される第2の電極と、
前記処理容器内の前記第1および第2の電極間の処理空間に所望の処理ガスを供給する処理ガス供給部と、
前記処理ガスを放電させてプラズマを生成するのに適した周波数を有する第1の高周波を前記第1の電極に印加する第1の高周波電源と、
プラズマ中のイオンが追従できる周波数を有する低周波または高周波の交流を前記第2の電極に印加する交流電源と、
前記交流電源と前記第2の電極との間に接続されるブロッキング用のコンデンサと
を有するプラズマ処理装置。 - 前記交流の周波数は、前記イオンのイオンプラズマ周波数よりも低い、請求項1に記載のプラズマ処理装置。
- イオンの引き込みに適した周波数を有する第2の高周波を前記第2の電極に印加する第2の高周波電源を更に備える、請求項1に記載のプラズマ処理装置。
- 前記第1の高周波の周波数は40MHz以上であり、前記第2の高周波の周波数は13MHz以下で前記イオンのイオンプラズマ周波数よりも高い、請求項3に記載のプラズマ処理装置。
- 被処理基板上のシリコン酸化膜に高アスペクト比の孔を形成するプラズマエッチング方法であって、
室内に第1の電極と第2の電極とを所定の間隔を空けて平行に配置している真空可能な処理容器内で前記第1の電極の上に被処理基板を載せて支持する工程と、
前記処理容器内を所定の圧力に真空排気する工程と、
前記第1の電極と前記第2の電極との間の処理空間にフルオロカーボン系のエッチングガスを供給し、前記第1の電極に第1の高周波を印加して前記処理空間で前記エッチングガスのプラズマを生成する工程と、
プラズマ中のイオンが追従できる周波数を有する低周波または高周波の交流をブロッキング用のコンデンサを介して前記第2の電極に印加する工程と
を有するプラズマエッチング方法。 - 前記第1の電極にイオンの引き込みに適した周波数を有する第2の高周波を印加する、請求項5に記載のプラズマエッチング方法。
- 前記エッチングガスが、フルオロカーボンガスとアルゴンガスと酸素ガスとを含む、請求項5に記載のプラズマエッチング方法。
- 前記第2の電極の母材がシリコンを含む、請求項5に記載のプラズマエッチング方法。
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2012
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- 2012-09-25 US US14/347,033 patent/US20140256147A1/en not_active Abandoned
- 2012-09-25 WO PCT/JP2012/006086 patent/WO2013046640A1/ja active Application Filing
- 2012-09-25 KR KR1020147007790A patent/KR101957348B1/ko active IP Right Grant
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2016
- 2016-10-03 US US15/283,703 patent/US9852922B2/en active Active
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Publication number | Priority date | Publication date | Assignee | Title |
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WO2020026802A1 (ja) * | 2018-07-30 | 2020-02-06 | 東京エレクトロン株式会社 | 制御方法及びプラズマ処理装置 |
JP2020025083A (ja) * | 2018-07-30 | 2020-02-13 | 東京エレクトロン株式会社 | 制御方法及びプラズマ処理装置 |
JP7306886B2 (ja) | 2018-07-30 | 2023-07-11 | 東京エレクトロン株式会社 | 制御方法及びプラズマ処理装置 |
WO2024080022A1 (ja) * | 2022-10-11 | 2024-04-18 | 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方法 |
Also Published As
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KR101957348B1 (ko) | 2019-03-12 |
JPWO2013046640A1 (ja) | 2015-03-26 |
TW201334018A (zh) | 2013-08-16 |
JP6431557B2 (ja) | 2018-11-28 |
US9852922B2 (en) | 2017-12-26 |
JP2017108159A (ja) | 2017-06-15 |
US20170092509A1 (en) | 2017-03-30 |
US20140256147A1 (en) | 2014-09-11 |
KR20140068090A (ko) | 2014-06-05 |
TWI611454B (zh) | 2018-01-11 |
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