WO2001088221A1 - Appareil de depot chimique en phase vapeur (cvd) au plasma et procede associe - Google Patents
Appareil de depot chimique en phase vapeur (cvd) au plasma et procede associe Download PDFInfo
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- WO2001088221A1 WO2001088221A1 PCT/JP2001/004113 JP0104113W WO0188221A1 WO 2001088221 A1 WO2001088221 A1 WO 2001088221A1 JP 0104113 W JP0104113 W JP 0104113W WO 0188221 A1 WO0188221 A1 WO 0188221A1
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Classifications
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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
- H01J37/32082—Radio frequency generated discharge
- H01J37/321—Radio frequency generated discharge the radio frequency energy being inductively coupled to the plasma
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
- C23C16/505—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using radio frequency discharges
- C23C16/509—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using radio frequency discharges using internal electrodes
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Definitions
- the present invention relates to a plasma CVD apparatus and method, and more particularly to a plasma CVD apparatus and method using an inductively coupled electrode to form a thin film having excellent film thickness uniformity.
- a parallel plate (capacitively coupled) plasma CVD device has been put into practical use.
- a parallel plate type plasma CVD device only one surface facing one electrode plate can be formed. Therefore, when it is desired to perform simultaneous film formation on two surfaces in the same film formation chamber, it is at best to install two high-frequency electrodes in the film formation chamber, form two discharge regions, and perform film formation on both surfaces.
- the uniformity of the thickness of the formed thin film is significantly reduced, and there is a problem that a solar cell having desired characteristics cannot be obtained.
- the electrode becomes large, a standing wave is generated on its surface, which may cause a distribution of plasma. This is even more pronounced when using higher frequencies, such as the VHF band. For this reason, in the case of a high frequency of, for example, 8 OMHz, the size of the substrate is said to be 0.3 mx 0.3 m (U. Krol l et al., Mat. Res. Soc. Syrap Proc. Vol 557 (1999) pl21-126).
- the plasma maintenance mechanism is completely different from that of the capacitive coupling type, and the high frequency of the VHF band, which is advantageous for the high-speed deposition of high quality films, does not cause the problem of the distance accuracy between electrodes unique to the above capacitive coupling type.
- An inductively coupled plasma CVD method that can generate a high plasma density has been proposed. More specifically, a ladder-shaped electrode (Japanese Patent Application Laid-Open No. Hei 4-236781) and an electrode obtained by bending a conductive wire in a zigzag pattern (Patent No. 2784544) are examples. An inductively coupled electrode type plasma CVD apparatus using such electrodes has been proposed.
- the present inventors examined various inductively coupled electrodes including the electrode having the above structure, and found that, for example, an inductively coupled electrode bent in a ladder shape or in a zigzag shape corresponds to an increase in the size of the substrate. If the current density is too large, the current path will not be uniform, and standing waves will be generated partially in unexpected places, making it difficult to make the plasma density uniform. It has been found that it is difficult to cope with a large area substrate by the method.
- This electrode has, for example, a structure in which a feeding part is provided at one end of a U-shaped electrode and the other end is grounded, and the distance between the grounding part and the feeding part and the folded part is one-two of the high-frequency excitation wavelength, and The standing wave is set up at the specified position (Japanese Patent No. 11 _ 25 55 219).
- a film thickness distribution is obtained along the longitudinal direction of the electrode, which gradually decreases from the power supply side, then increases, and then decreases again at the maximum. .
- This distribution is thought to be the result of the high frequency power attenuation and the effect of the standing wave acting synergistically, but since this film thickness distribution is reproducible, the desired film thickness uniformity can be obtained.
- a substrate of the same size as this region is arranged to form a thin film having a uniform thickness.
- this film forming method utilizes a uniform density region of plasma generated around the electrode, the electrode is naturally longer than the substrate size, and the apparatus itself is correspondingly larger.
- an electrode capable of forming uniform plasma over a wider area in the longitudinal direction of the electrode is required. Polar structures and equipment are required.
- an object of the present invention is to provide a plasma CVD apparatus and method capable of forming a high-quality thin film having excellent film thickness uniformity on a larger substrate.
- an object of the present invention is to provide an electrode structure and a power supply method capable of expanding a plasma uniform region in the longitudinal direction of the electrode, thereby providing a thin film having excellent film thickness uniformity on a larger substrate with the same apparatus dimensions.
- An object of the present invention is to realize a formable plasma CVD apparatus and method. It is another object of the present invention to provide a plasma CVD apparatus and a method capable of forming such a thin film with a high throughput. Furthermore, it is another object of the present invention to provide a plasma CVD apparatus and method with high productivity by suppressing the film adhering to the inner wall of the apparatus and extending the tallying cycle. Disclosure of the invention
- the present inventor studied various methods for supplying high-frequency power, electrode structure, film forming conditions, etc. in order to expand the uniform region of plasma density.
- the discharge area expands and contracts, and that the plasma density near the power supply changes relatively.
- the density of the plasma it was found that when plasma was generated using electrodes having partially different electrode diameters, there was a tendency for the density of the plasma to vary depending on the size of the electrode diameter.
- the U-shaped electrode was coated with a dielectric, the thickness distribution of the formed thin film showed a peculiar change depending on the coating method.
- the present invention has been completed based on such findings by further studying plasma uniformization and film thickness uniformity.
- the plasma CVD apparatus of the present invention is a plasma CVD apparatus in which an inductively-coupled electrode having a linear shape or a shape folded at the center is disposed in a reaction vessel, and high-frequency power is applied to both ends of the inductively-coupled electrode.
- a high-frequency power is supplied so that a standing wave having a half wavelength or a natural number multiple of a half wavelength stands between the ground portion and the folded portion, and at least a portion from the power supply portion to the ground portion of the inductive coupling electrode is provided. It is characterized in that part of the electrode diameter is less than 1 Omm.
- the electrode diameter is not particularly limited as long as it is 10 mm or less, but is preferably 1 mm to 10 mm from the viewpoint of easy handling and mounting. Further, the electrode diameter may be changed.
- ⁇ is in a vacuum determined by the excitation frequency f and the radio wave propagation velocity c in a vacuum. And strictly different. According to the study of the present inventors, ⁇ is a first approximation. However, it is also affected by the dielectric material surrounding the electrodes, the permittivity of the plasma, and the geometric structure.
- the plasma CVD apparatus of the present invention is a plasma CVD apparatus in which an inductively-coupled electrode having a linear shape or a shape folded at the center is disposed in a reaction vessel, and high-frequency power is applied to both ends of the inductively-coupled electrode.
- a half-wave or a natural number multiple of a standing wave is generated between the feeding part and the grounding part, or between the feeding part and the grounding part and the folded part.
- the high frequency power is supplied as described above, and the diameter of the inductive coupling type electrode is changed.
- the plasma CVD apparatus of the present invention is a plasma CVD apparatus in which an inductively coupled electrode having a linear shape or a folded shape at the center is disposed in a reaction vessel, and a high-frequency wave is applied to both ends of the inductively coupled electrode.
- a power supply unit and a ground unit are provided so that a standing wave having a half wavelength or a natural number multiple of a half wavelength stands between the power supply unit and the ground unit or between the power supply unit and the grounding unit and the turnback unit.
- a high-frequency power is supplied, and a part or the entire surface of the inductive coupling electrode is coated with a dielectric.
- the plasma density distribution in the longitudinal direction of the electrode can be made more uniform. That is, the same effect as in the case of changing the electrode diameter can be obtained, and a thin film having a uniform thickness can be formed on a larger substrate with the same apparatus dimensions. That is, miniaturization of the device is achieved.
- the thickness of the dielectric is changed in the longitudinal direction of the electrode.
- the electrode part near the power supply part is covered with a thick dielectric, and the thickness is gradually reduced, or the film thickness increases near the center of the electrode.
- the vicinity of the center is covered with a thick dielectric, the end is tapered, and the thickness of the dielectric is reduced toward the end of the dielectric.
- the electrode may be covered in a spiral shape along the longitudinal direction of the electrode.
- the plasma CVD apparatus of the present invention is characterized in that a plurality of the inductively coupled electrodes are arranged in parallel on the same plane. By arranging a plurality of electrodes in the width direction of the substrate, it is possible to form a uniform thin film on a substrate of any width with a simple configuration.
- the power supply sections of the plurality of inductively coupled electrodes are configured to always maintain the same high-frequency phase relationship. This is because if the phase of each electrode is not controlled, a non-uniform distribution with high reproducibility is likely to occur in the substrate width direction.
- the plasma CVD device of the present invention is characterized in that the inductively coupled electrodes are arranged in a plurality of layers, and substrates are arranged on both sides of each layer.
- the inductively coupled electrode unlike the case of the capacitively coupled electrode, a so-called multi-region film forming method can be adopted without causing an increase in the size of the apparatus and deterioration in maintainability. It is possible to construct a device on which a film can be simultaneously formed. As a result, the throughput is greatly improved, which greatly contributes to, for example, cost reduction of solar cells.
- the plasma CVD apparatus of the present invention is a plasma CVD apparatus in which a plurality of inductively coupled electrodes having a linear shape or a shape folded at the center are arranged in parallel in a reaction vessel. It at each end A power supply unit and a grounding unit for high-frequency power are provided, respectively, and a standing wave of a half wavelength or a natural number multiple thereof is provided between the power supply unit and the grounding unit or between the power supply unit and the grounding unit and the turnback unit.
- the high-frequency power is supplied so as to stand up, and the phases of the high-frequency power supplied to the power supply sections of the adjacent electrodes are opposite to each other.
- the method of setting the opposite phase is effective even when the electrode is not covered with the dielectric, and suppresses the phenomenon that a thick region is formed near the center of the electrode.
- an inductively coupled electrode having a linear shape or a folded shape at the center is arranged in a reaction vessel, and a high-frequency power feeder is provided at each end of the inductively coupled electrode.
- a grounding part, and at least a part of the electrode diameter from the power supply part to the grounding part of the inductive coupling type electrode is set to 1 Omm or less, or the electrode diameter of the inductive coupling type electrode is changed.
- the high-frequency power is supplied between the power supply part and the grounding part or between the power supply part and the grounding part and the folded part so that a standing wave having a half wavelength or a natural number multiple thereof is formed, and is introduced into the reaction vessel.
- the method is characterized in that plasma of the reactive gas is generated, and a thin film containing at least one of the constituent elements of the reactive gas is formed.
- an inductively-coupled electrode having a linear shape or a shape folded at the center and having a part or the entire surface thereof covered with a dielectric is disposed in a reaction vessel.
- a high-frequency power supply unit and a ground unit are provided at both ends of the inductive coupling type electrode, respectively, and a half-wavelength or a half-wave or between the power supply unit and the ground unit and the folded unit is provided between the power supply unit and the ground unit.
- a high-frequency power is supplied so that a standing wave having a natural number multiple times that of natural gas is generated to generate a plasma of the reactive gas introduced into the reaction vessel, and a thin film containing at least one of the constituent elements of the reactive gas is generated. Is formed.
- a linear or A plurality of inductively coupled electrodes having a shape folded at the center are arranged in parallel, a power supply section for high-frequency power and a grounding section are provided at both ends of each of the plurality of inductively coupled electrodes, and a power supply section for adjacent electrodes is provided.
- the phases of the high-frequency power supplied to the power supply unit are opposite to each other, and a standing wave having a half wavelength or a natural number multiple of a half wavelength is provided between the power supply unit and the ground unit or between the power supply unit and the ground unit and the turnback unit. It is characterized in that high-frequency power is supplied to generate plasma of the reactive gas introduced into the reaction vessel, and a thin film containing at least one of the constituent elements of the reactive gas is formed.
- FIG. 1 is a schematic cross-sectional view showing a first embodiment of the plasma CVD apparatus of the present invention.
- FIG. 2 is a schematic diagram illustrating an example of the electrode shape of the inductively coupled electrode.
- FIG. 3 is a schematic sectional view showing a second embodiment of the plasma CVD apparatus of the present invention.
- FIG. 4 is a schematic diagram showing an example of a dielectric covering shape.
- FIG. 5 is a schematic cross-sectional view showing a third embodiment of the plasma CVD apparatus of the present invention.
- FIG. 6 is a schematic side sectional view showing a fourth embodiment of the plasma CVD apparatus of the present invention.
- FIG. 7 is a graph showing the film thickness distribution of Example 1.
- FIG. 8 is a graph showing the film thickness distribution of Example 2.
- 1 is a film forming chamber
- 2 is an inductively coupled electrode
- 3 is a dielectric
- 4 is a folded part
- 5 is a gas inlet
- 6 is an exhaust port
- 7 is a high frequency power supply
- 8 is a coaxial cable
- 9 Denotes a high-frequency power supply unit
- 10 denotes a grounding unit
- 11 denotes a substrate
- 12 denotes a substrate holder.
- FIG. 1 is a schematic cross-sectional view showing a first embodiment of the plasma CVD apparatus of the present invention.
- an inductively-coupled electrode 2 having an outer diameter of 1 Omm or less and bent in a U-shape is disposed in a film forming chamber 1 having a gas inlet 5 and an exhaust port 6,
- a high-frequency power supply section 9 at one end is connected to a high-frequency power supply 7 via a coaxial cable 8
- a grounding section 10 at the other end is connected to a wall of a film forming chamber and grounded.
- the length between the feeding section 9 and the grounding section 10 and the folded section 4 is determined to be approximately 1/2 of a high frequency excitation wavelength or a natural number multiple thereof. As a result, a stable discharge can be generated and maintained.
- the folded portion refers to a semicircular portion having a curvature.
- the inductively-coupled electrode of this embodiment is a U-shaped rod (wire) or tubular conductor made of SUS, Al, Cu or the like having an outer diameter of 10 mm or less.
- a rectangular shape such as “U-shaped” may be used.
- the entire electrode does not need to be a conductor, for example, an insulator covered with a conductor.
- the electrode having the shape folded at the center of the present invention does not need to be, for example, one formed by bending a single bar, and for example, two linear electrodes are formed of a metal plate or the like.
- the folded portion refers to a straight portion between them.
- the electrode of the present embodiment may have a thickness larger than 10 mm if at least a part of the electrode from the power supply part to the folded part has a diameter of 10 mm or less. . Therefore, the same diameter Alternatively, the diameter may be changed in the longitudinal direction. For example, the diameter may be gradually increased from the power supply portion.
- the lower limit of the electrode diameter is not particularly limited, and any fine wire may be used as long as the electrode can stably discharge without disconnection in relation to input power, etc. From, electrode diameter 1 mn! ⁇ ⁇ ⁇ 10 mm is preferably used.
- the discharge area can be expanded toward the tip (returned part) with less input power. As a result, a wider film formation region is formed, and film formation on a large substrate becomes possible.
- the plasma density in the vicinity of the power supply section is relatively reduced. That is, since the plasma density ratio in the vicinity of the power supply unit to the film formation region is reduced, energy is efficiently used for film formation, and the amount of film adhering to the inner wall of the device in the vicinity of the power supply unit is suppressed. Further, since the number of film formations until the film thickness adhering to the inner wall becomes a film thickness to be peeled increases, the maintenance cycle is extended, and the overall productivity can be improved.
- a predetermined flow rate of a reactive gas is introduced into the film forming chamber 1 from the gas inlet 5, and a main valve (not shown) provided at the exhaust port 6 is adjusted to a predetermined pressure, and then the high frequency is set.
- High frequency power is supplied from the power supply 7 to the power supply unit 9.
- the frequency of the high frequency is adjusted so that the standing wave rises, plasma occurs along the electrode 2.
- the plasma extends from the power supply side and the ground side along the electrode 2 toward the tip end (return portion) of the electrode, and the reactive gas is decomposed and activated by the plasma, and is disposed at a position facing the electrode 2.
- a thin film having excellent thickness uniformity is deposited on the substrate 11.
- the electrode diameter on the power supply side should be 1 O mm or less.
- the discharge extends to the electrode tip with less power.
- a thinner electrode can obtain a higher film forming rate.
- the plasma density near the power supply is low, the amount of film adhering to the inner wall is reduced.
- the inductively coupled electrode of the present embodiment is not limited to this, and the electrode diameter is not limited to 10 mm or more. Any shape that changes in the longitudinal direction of the electrode can be used. That is, if an electrode having the same diameter and a shape turned back at the center is used, the plasma will be partially shaded, but by changing the electrode diameter in accordance with this shaded distribution, the plasma shade ratio will be reduced. The uniformity of the film thickness can be improved.
- the electrode diameter and providing a portion of 10 mm or less the effect of expanding the discharge region and the effect of uniformizing the plasma can be obtained, and a thin film having a uniform thickness can be obtained on a larger substrate. Formation is possible.
- FIG. 3 is a schematic sectional view showing a second embodiment of the plasma CVD apparatus of the present invention.
- the configuration of the device is the same as that of FIG. 1 except for the inductive coupling type electrode.
- the surface of the inductive coupling type electrode 2 is covered with a dielectric 3 such as Teflon.
- the dielectric may be formed so as to cover the entire surface of the electrode, or may be formed so as to cover only a part of the electrode surface.
- the film thickness uniformity can be improved, and the dielectric formation position and the shape thereof are determined according to the plasma density distribution (or film thickness distribution) pattern. For example, if the entire surface of the electrode is covered with a dielectric, the maximum of the film thickness distribution, which is thought to appear due to the synergistic effect of the attenuation effect due to the propagation of high-frequency power and the effect of the standing wave, decreases. The range of film formation for obtaining a predetermined film thickness is expanded. You. Further, by changing the thickness of the dielectric in the longitudinal direction of the electrode, the uniformity of the thickness of the obtained thin film can be further improved.
- the dielectric may be formed not on the entire electrode surface, but only on the linear portion on the side of the power supply section, for example, as shown in FIG. 4 (a).
- the dielectric may be formed not on the entire electrode surface, but only on the linear portion on the side of the power supply section, for example, as shown in FIG. 4 (a).
- the plasma density may increase at the end of the dielectric, and a peak of the film thickness distribution may appear at a corresponding position on the substrate.
- the cross section at the end of the dielectric should be tapered, and the thickness of the dielectric should be gradually reduced toward the end of the dielectric. Is preferred.
- the dielectric may be spirally coated along the longitudinal direction of the electrode, and the plasma density at the end of the dielectric may be averaged, and the film thickness distribution may be similarly reduced. It will be improved.
- the thickness of the dielectric is appropriately selected according to the degree of plasma density distribution (film thickness distribution) depending on the dielectric constant (material).
- the thickness is preferably about 0.1 mm or more.
- the dielectric may be any material such as an organic material such as Teflon or an inorganic material such as alumina or quartz as long as it is stable against plasma and heat. Materials are not preferred.
- the inductive coupling type electrode not only the folded electrode shown in FIG. 1 but also a linear electrode can be used.
- one end is attached to the opposite wall of the film forming chamber with the supply section as one end and the other end as the ground section.
- the inductively-coupled electrode has the following features: 1) at least a part of the electrode diameter from the power supply portion to the ground portion is 10 mm or less; 3) By changing the electrode diameter, 3) By coating with a dielectric, and by combining them, it becomes possible to form a thin film with excellent film thickness uniformity on a larger substrate.
- FIG. 5 shows a third embodiment of the plasma CVD apparatus of the present invention.
- the PCVD apparatus shown in FIGS. 1 and 3 has a configuration in which one inductively-coupled electrode is arranged in the film forming chamber. However, when the width of the substrate is large, as shown in FIG. May be arranged in parallel to the width of the substrate so that high-frequency power can be supplied to each electrode.
- reference numeral 12 denotes a substrate holder.
- the high-frequency phase is controlled in the power supply section of each electrode. If the phase of each electrode is not controlled, a non-uniform film thickness distribution with no reproducibility in the substrate width direction is likely to occur. Further, it is more preferable to supply the high-frequency power so that the adjacent electrodes have opposite phases (that is, the phases are shifted by 180 °). By reversing the phase of the high frequency between adjacent electrodes, a thin film having uniform characteristics and uniform characteristics can be formed over the entire substrate.
- the above is not limited to an electrode having a folded shape such as a U-shape, and the same applies to the case where a linear rod-shaped electrode is used.
- the length of the power supply portion and the length of the folded portion are set every other electrode (in the case of a linear electrode, the power supply portion is connected to the ground. (Length of the part) is extended by half the wavelength of high frequency
- the unit may be provided outside the film forming chamber, or a coaxial cable equivalent to a length corresponding to a half wavelength may be added to the power supply unit.
- a phase shifter may be provided in the high frequency power supply to supply every other high frequency shifted by half a wavelength.
- FIG. 6 shows a fourth embodiment of the plasma CVD apparatus of the present invention.
- the electrode rows arranged in the substrate width shown in FIG. 5 are arranged in a plurality of layers at a predetermined interval, and the substrates are arranged on both sides of each electrode layer.
- thin films can be simultaneously formed on a large number of substrates (six in the example in the figure), and the throughput can be greatly increased.
- the distance between the electrode and the substrate can be as short as about 30 to 60 mm, it is possible to realize a thin film forming apparatus having an excellent throughput ratio to the installation area of the apparatus.
- a high-frequency power supply in the VHF band of 30 to 300 MHz is preferably used.
- various outer diameter rods are processed and arranged in a U-shape or a U-shape, and plasma is generated under various conditions to form a thin film, and the generated plasma is generated. The condition was visually observed.
- a SUS or Cu rod or tube having an outer diameter of 1, 4, 6, or 10 mm is folded back so that the center-to-center distance becomes 30 mm, and a U-shape having a length of 1570 mm is obtained.
- U-shape, and as shown in Fig. 4 (a) was coated with a Teflon tube.
- the six electrodes were mounted on the same plane as shown in Fig. 5 with the center-to-center distance between adjacent rods set to 30 mm, and the distance between the electrode surface and the substrate surface was set to 40 mm, and the substrate 11 (1200 mm x 500 mm).
- the power supply section of the electrode was connected to a terminal of the feedthrough inside the film formation chamber, and the grounding section was connected to the wall of the film formation chamber.
- the S i H 4 gas introduced 2 0 0 sccm inside the film forming chamber 1 was set to 1 P a, supplies antiphase frequency alternately adjust the frequency so as to establishing a standing wave Then, a plasma was generated, and an a-Si thin film was formed on the substrate 11.
- Electrodes with an outer diameter of 1 mm use C ul and set the thickness of Teflon to 2 mm.
- electrodes with an outer diameter of 4, 6, and 1 Omm use stainless steel rods and set the thickness of Teflon to 1 mm.
- the electrode shape is U-shaped for 1 mm and 10 mm diameter, and U-shaped for 4 mm and 6 mm diameter electrodes.
- Table 1 shows the results of visual observation of the change in the discharge region when the applied power was changed for each electrode having a diameter of 1 to 10 mm.
- FIG. 7 shows an example of the result of measuring the film thickness distribution in the electrode longitudinal direction at the center of the substrate for the formed thin film.
- FIG. 7 is a graph comparing the change in the film forming rate using different electrode diameters. In Fig. 7, ⁇ 6 mm and ⁇ 10 mm apply 25 W per electrode, and ⁇ 4 mm applies 13.75 W per electrode. As is clear from the film thickness distribution shown in FIG.
- a uniform film thickness distribution over a wide range can be obtained by setting the electrode diameter to 1 Omm or less and supplying a predetermined power. Also, it can be seen that, when the same power is applied, the thinner the electrode diameter, the faster the film formation rate can be obtained. From this, it seems that energy utilization efficiency is higher for thinner electrodes.
- a-Si film was formed on a glass substrate.
- a 10 mm diameter SUS round tube was folded back so that the center-to-center distance was 3 Omm, and it was made into a 11-shape with a length of 15 70111111, and the entire surface was a 1 mm thick Teflon tube.
- the electrode coated with was used.
- the six electrodes were mounted on the same plane as shown in Fig. 5 with the center-to-center distance between adjacent round tubes set to 30 mm, and the distance between the electrode surface and the substrate surface was set to 40 mm, and the substrate 11 (1 (200 mm x 500 mm) was placed.
- Other conditions are the same as in the first embodiment.
- the film thickness distribution in the electrode longitudinal direction at the center of the substrate was measured.
- Figure 8 shows the results. For comparison, FIG. 8 also shows a case where a thin film was similarly formed using an electrode not covered with a dielectric.
- Electrode Teflon coating, antiphase horizontal axis indicates position in the longitudinal direction of electrode on substrate, vertical axis indicates normalized film thickness.
- the peak near the substrate position of 80 mm due to the synergistic effect between the attenuation of the high frequency and the standing wave disappears, and the uniformity of the film thickness is reduced. It can be seen that it is greatly improved. In addition, it can be seen that the uniformity of the film thickness is further improved by supplying every other high frequency power having the opposite phase.
- the film thickness distribution can be greatly improved compared to the past. Further, by changing the thickness of the dielectric material in the longitudinal direction of the electrode or by partially forming the dielectric material, a more uniform thin film can be formed even on a large substrate of 1200 mm or more. It becomes possible.
- the plasma region can be further expanded and uniform. Can be realized.
- the maintenance cycle is extended and productivity is improved.
- the plasma CVD method of the present invention at least a part of the folded-shaped inductively-coupled electrode from the feeding portion to the folded portion is set to 10 mm or less, and high-frequency power is supplied so that a standing wave is generated.
- the discharge region can be expanded in the longitudinal direction of the electrode, and a thin film can be formed on a larger substrate.
- the electrode diameter By making the electrode diameter smaller, plasma is generated with less power, and when the same power is applied, the electrode diameter A smaller film thickness can realize a higher film forming speed.
- the plasma density in the vicinity of the power supply can be reduced, the film adhering to the inner wall of the device in the vicinity of the power supply can be reduced, and the frequency of cleaning can be greatly reduced.
- the electrode diameter or coating the electrode with a dielectric material the plasma density can be partially adjusted in the longitudinal direction of the electrode, and a thin film with even more uniform film thickness can be formed. Become.
- the inductively coupled electrode of the present invention By arranging the inductively coupled electrode of the present invention in a plurality of layers and arranging substrates on both sides thereof, it is possible to provide a high-throughput plasma CVD apparatus and method.
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Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT01932112T ATE452219T1 (de) | 2000-05-17 | 2001-05-17 | Plasma-cvd-vorrichtung und verfahren |
US10/276,371 US20040020432A1 (en) | 2000-05-17 | 2001-05-17 | Plasma cvd apparatus and method |
JP2001584602A JP4867124B2 (ja) | 2000-05-17 | 2001-05-17 | プラズマcvd装置及び方法 |
EP01932112A EP1293588B1 (en) | 2000-05-17 | 2001-05-17 | Plasma cvd apparatus and method |
DE60140803T DE60140803D1 (de) | 2000-05-17 | 2001-05-17 | Plasma-cvd-vorrichtung und verfahren |
KR1020027015416A KR100797423B1 (ko) | 2000-05-17 | 2001-05-17 | 플라즈마 cvd 장치 및 방법 |
US12/368,740 US20090148624A1 (en) | 2000-05-17 | 2009-02-10 | Plasma cvd apparatus and method |
US12/855,809 US9165748B2 (en) | 2000-05-17 | 2010-08-13 | Plasma CVD method |
Applications Claiming Priority (4)
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JP2000-145645 | 2000-05-17 | ||
JP2000145645 | 2000-05-17 | ||
JP2000239221 | 2000-08-07 | ||
JP2000-239221 | 2000-08-07 |
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US10276371 A-371-Of-International | 2001-05-17 | ||
US12/368,740 Continuation US20090148624A1 (en) | 2000-05-17 | 2009-02-10 | Plasma cvd apparatus and method |
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WO2001088221A1 true WO2001088221A1 (fr) | 2001-11-22 |
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PCT/JP2001/004113 WO2001088221A1 (fr) | 2000-05-17 | 2001-05-17 | Appareil de depot chimique en phase vapeur (cvd) au plasma et procede associe |
Country Status (8)
Country | Link |
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US (3) | US20040020432A1 (ja) |
EP (1) | EP1293588B1 (ja) |
JP (2) | JP4867124B2 (ja) |
KR (1) | KR100797423B1 (ja) |
AT (1) | ATE452219T1 (ja) |
DE (1) | DE60140803D1 (ja) |
ES (1) | ES2336303T3 (ja) |
WO (1) | WO2001088221A1 (ja) |
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ES2336303T3 (es) | 2010-04-12 |
EP1293588A9 (en) | 2003-05-28 |
KR100797423B1 (ko) | 2008-01-23 |
EP1293588A1 (en) | 2003-03-19 |
JP4867124B2 (ja) | 2012-02-01 |
DE60140803D1 (de) | 2010-01-28 |
JP5287944B2 (ja) | 2013-09-11 |
JP2012007239A (ja) | 2012-01-12 |
US20090148624A1 (en) | 2009-06-11 |
US20040020432A1 (en) | 2004-02-05 |
ATE452219T1 (de) | 2010-01-15 |
US20100316815A1 (en) | 2010-12-16 |
EP1293588B1 (en) | 2009-12-16 |
KR20030032956A (ko) | 2003-04-26 |
US9165748B2 (en) | 2015-10-20 |
EP1293588A4 (en) | 2007-03-28 |
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