WO2011034057A1 - プラズマ処理装置およびプラズマ処理装置用ガス供給機構 - Google Patents
プラズマ処理装置およびプラズマ処理装置用ガス供給機構 Download PDFInfo
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Images
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/02274—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition in the presence of a plasma [PECVD]
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- C—CHEMISTRY; METALLURGY
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- 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
- C23C16/4412—Details relating to the exhausts, e.g. pumps, filters, scrubbers, particle traps
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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
- C23C16/455—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 characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45517—Confinement of gases to vicinity of substrate
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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
- C23C16/455—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 characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02164—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon oxide, e.g. SiO2
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- H—ELECTRICITY
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- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/0217—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/0228—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition deposition by cyclic CVD, e.g. ALD, ALE, pulsed CVD
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—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
- 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
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/28008—Making conductor-insulator-semiconductor electrodes
- H01L21/28017—Making conductor-insulator-semiconductor electrodes the insulator being formed after the semiconductor body, the semiconductor being silicon
- H01L21/28158—Making the insulator
- H01L21/28167—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation
- H01L21/28194—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation by deposition, e.g. evaporation, ALD, CVD, sputtering, laser deposition
Definitions
- the present invention relates to a plasma processing apparatus and a gas supply mechanism for a plasma processing apparatus, and more particularly to a plasma processing apparatus used for manufacturing a semiconductor element, and a gas supply for a plasma processing apparatus used in such a plasma processing apparatus. It relates to the mechanism.
- an effective means is an ALD (Atomic Layer Deposition) method that can form a film by periodically supplying a reaction gas corresponding to an atomic unit to the substrate surface and perform highly accurate film thickness control. It is known to be one of However, the film quality of the film formed by the ALD method is insufficient in the withstand voltage characteristic and the leak characteristic as compared with the film quality of the film formed by the thermal CVD method.
- PE-ALD Pulsma-Enhanced ALD
- plasma energy is attracting attention as a means of solving these problems and forming a high-quality film more efficiently (May 15, 2008 ASM Semi Semi Mfg China ALD Article). .Pdf (Non-Patent Document 1)).
- the processing by the PE-ALD method is performed in the following flow (1) to (3). That is, the processing by the PE-ALD method includes (1) a step of supplying and chemically adsorbing a first gas containing atoms forming a thin film on a substrate surface or a base film, and (2) an excess gas physically adsorbed in the above step. A step of removing, and (3) a step of forming a desired thin film by plasma treatment using a second gas containing atoms forming the thin film.
- the problem here is that the performance required for the processing container is different between the steps (1) and (2) and the step (3).
- improving the throughput has been one of the important issues in developing the apparatus.
- the gas replacement characteristic is important. For example, consider a case where chemical adsorption is performed by supplying a gas onto a substrate. In order to adsorb and saturate the gas, it is necessary to increase the pressure in the processing container to a constant pressure.
- the pressure difference before and after pressure increase in the processing container is ⁇ P
- the gas supply flow rate is Q
- the volume of the processing container is V
- the time required for pressure increase is t
- t ⁇ P ⁇ V / Q.
- the volume of the processing container of a certain level or more is necessary to generate high-quality plasma. That is, there is a limit to reducing the volume of the processing container.
- An object of the present invention is to provide a plasma processing apparatus capable of efficiently forming a high-quality film.
- Another object of the present invention is to provide a gas supply mechanism for a plasma processing apparatus that can efficiently form a high-quality film.
- a plasma processing apparatus includes a bottom part located on the lower side and a side wall extending upward from the outer peripheral side of the bottom part, and is capable of sealing, and a processing container for performing plasma processing on the substrate to be processed therein,
- a holding table disposed in the processing container and holding the substrate to be processed thereon; plasma generating means for generating plasma in the processing container; a first position and a first position on the upper side of the holding table;
- a gas supply mechanism for supplying a film forming gas and for adsorbing the film forming gas on the substrate to be processed;
- the deposition gas when the deposition gas is adsorbed on the substrate to be processed, the deposition gas can be supplied in a small volume region formed between the holding base and the head portion. Then, the supply amount of the film forming gas can be reduced.
- pressure adjustment can be performed with a small flow rate in a small volume region, rather than pressure adjustment of the entire processing container having a large volume, so that the pressure adjustment can be shortened. Therefore, film formation can be performed efficiently.
- the plasma treatment when the plasma treatment is performed, the inner wall surface of the processing container is not exposed to the film forming gas, so that the reaction product can be prevented from adhering to the inner wall surface of the processing container. Then, the number of processes for cleaning the inner wall surface of the processing container can be reduced. In addition, the generation of particles can be suppressed. Therefore, according to such a plasma processing apparatus, a high-quality film can be efficiently formed.
- the head part includes a substantially disk-shaped disk part, and the disk part covers the upper side of the holding table when the head part is disposed at the first position.
- the head portion may include a bar-shaped portion extending in the horizontal direction in the processing container, and the bar-shaped portion may be configured to be able to move in a horizontal direction on an area on the target substrate held on the holding table. .
- the gas supply mechanism is provided at a position facing the substrate to be processed held on the holding table when the head part is arranged at the first position, and supplies a film forming gas. Including gas supply holes.
- the gas supply mechanism includes an exhaust mechanism that exhausts a small volume region formed between the head unit and the holding base when the head unit is disposed at the first position.
- the exhaust mechanism is provided in a position facing the substrate to be processed held on the holding table when the head unit is arranged at the first position, An exhaust hole for exhausting a small volume region formed between the head portion and the head portion is included.
- the volume of the small volume region formed between the head unit and the holding base when the head unit is arranged at the first position is 50% or less of the volume of the processing container.
- the head portion is movable in at least one of the vertical direction and the horizontal direction.
- the gas supply mechanism includes a support portion that extends from the side wall, has an inner side portion connected to the head portion, and supports the head portion.
- the gas supply mechanism includes a support portion that extends from the side wall side, the inner side portion is connected to the head portion, and supports the head portion, and the exhaust mechanism is an exhaust gas exhausted inside the support portion.
- the gas supply mechanism includes an exhaust passage serving as a gas passage, the gas supply mechanism includes a gas supply passage serving as a passage of the gas to be supplied inside the support portion, and the gas supply passages are multiplexed so as to be inside the gas exhaust passage. It may be provided.
- a substrate movement mechanism that can perform at least one of supporting the substrate to be processed on the holding table and detaching the substrate to be processed supported on the holding table may be provided.
- you may comprise a head part so that it can rotate centering on the outer side edge part of a support part.
- the processing container is formed so that a part of the side wall extends outward, and is provided with a receiving portion that can receive the head portion.
- region outside an accommodating part may be provided.
- the blocking mechanism includes a shielding plate that is movable along the inner wall surface of the side wall.
- the processing container includes a first processing container and a second processing container different from the first processing container, and the head unit moves between the first processing container and the second processing container. It may be configured to be possible.
- the holding table is movable in at least one of the vertical direction and the horizontal direction.
- the plasma generating means includes a microwave generator that generates a microwave for plasma excitation, and a dielectric window that is provided at a position facing the holding table and introduces the microwave into the processing container.
- the plasma generating means includes a slot antenna plate which is provided with a plurality of slot holes and which is disposed above the dielectric window and radiates microwaves to the dielectric window.
- a gas supply mechanism for a plasma processing apparatus includes a bottom portion located on a lower side and a side wall extending upward from an outer peripheral side of the bottom portion, and is sealable, and in the inside thereof, a substrate to be processed
- a plasma processing apparatus includes a processing container that performs plasma processing, a holding base that is disposed in the processing container and holds a substrate to be processed, and a plasma generation unit that generates plasma in the processing container.
- the gas supply mechanism for a plasma processing apparatus includes a first position on the upper side of the holding table and a head section that can be moved to a second position different from the first position and can supply a gas.
- a film forming gas is supplied in a small volume region formed between the head portion and the holding base when the film is disposed at the first position, and the film forming gas is adsorbed on the substrate to be processed.
- exhaust for exhausting a small volume region formed between the holding table and the head unit at a position facing the target substrate held on the holding table includes holes.
- the deposition gas when the deposition gas is adsorbed on the substrate to be processed, the deposition gas can be supplied in a small volume region formed between the holding table and the head portion. Then, the supply amount of the film forming gas can be reduced. In addition, during film formation, pressure adjustment can be performed with a small flow rate in a small volume region, rather than pressure adjustment of the entire processing container having a large volume, so that the pressure adjustment can be shortened. Therefore, film formation can be performed efficiently. Furthermore, when the plasma treatment is performed, the inner wall surface of the processing container is not exposed to the film forming gas, so that the reaction product can be prevented from adhering to the inner wall surface of the processing container. Then, the number of processes for cleaning the inner wall surface of the processing container can be reduced. In addition, the generation of particles can be suppressed. Therefore, according to such a plasma processing apparatus, a high-quality film can be efficiently formed.
- FIG. 2 It is a schematic sectional drawing which shows a part of MOS type semiconductor element. It is a schematic sectional drawing which shows the principal part of the plasma processing apparatus which concerns on one Embodiment of this invention. It is the figure which looked at the slot antenna board contained in the plasma processing apparatus shown in FIG. 2 from the plate
- FIG. 3 is a schematic cross-sectional view showing a state in which the head portion is housed in the housing portion in the plasma processing apparatus shown in FIG. 2.
- It is a flowchart which shows the process of the typical process at the time of forming into a film with the plasma processing apparatus shown in FIG.
- It is a graph which shows the relationship between the gas flow rate in the whole processing container, and the arrival time until it reaches a predetermined pressure.
- FIG. 27 is a schematic cross-sectional view showing a configuration of a part near the base portion of the support portion shown in FIG.
- FIG. 17 corresponds to a XXVII-XXVII cross section in FIG.
- FIG. 1 is a schematic sectional view showing a part of a MOS type semiconductor device manufactured by a plasma processing apparatus according to an embodiment of the present invention.
- the conductive layer is indicated by hatching.
- MOS type semiconductor element 11 includes element isolation region 13, p-type well 14a, n-type well 14b, high-concentration n-type impurity diffusion region 15a, high-concentration p-type impurity on silicon substrate 12. Diffusion region 15b, n-type impurity diffusion region 16a, p-type impurity diffusion region 16b, and gate oxide film 17 are formed.
- One of the high-concentration n-type impurity diffusion region 15a and the high-concentration p-type impurity diffusion region 15b formed so as to sandwich the gate oxide film 17 is a drain, and the other is a source.
- a gate electrode 18 serving as a conductive layer is formed on the gate oxide film 17, and a gate sidewall 19 serving as an insulating film is formed on a side portion of the gate electrode 18. Furthermore, an insulating film 21 is formed on the silicon substrate 12 on which the gate electrode 18 and the like are formed. In the insulating film 21, a contact hole 22 that is continuous with the high concentration n-type impurity diffusion region 15 a and the high concentration p-type impurity diffusion region 15 b is formed, and a buried electrode 23 is formed in the contact hole 22. Further, a metal wiring layer 24 serving as a conductive layer is formed thereon.
- an interlayer insulating film (not shown) to be an insulating layer and a metal wiring layer to be a conductive layer are alternately formed, and finally a pad (not shown) to be a contact point with the outside is formed.
- the MOS type semiconductor element 11 is formed.
- a silicon oxide film formed by adsorbing a film forming gas on a substrate to be processed and performing plasma processing, for example, a gate An oxide film 17 is included.
- the insulating film formed by the plasma processing apparatus according to the present invention is a silicon oxide film that constitutes the gate oxide film described above, and the plasma processing is performed by adsorbing the film forming gas onto the substrate to be processed. A film is formed.
- FIG. 2 is a schematic cross-sectional view showing the main part of the plasma processing apparatus according to one embodiment of the present invention.
- 3 is a view of the slot antenna plate included in the plasma processing apparatus shown in FIG. 2 as viewed from the lower side, that is, from the direction of arrow III in FIG. In FIG. 2, some of the members are not hatched for easy understanding.
- the plasma processing apparatus 31 includes a processing container 32 that performs plasma processing on the substrate W to be processed therein, and a plasma processing apparatus that supplies a reactive gas for plasma processing into the processing container 32.
- Gas supply unit 33 a disk-shaped holding table 34 for holding the substrate W to be processed thereon, a plasma generating mechanism 39 for generating plasma in the processing vessel 32, and control for controlling the entire plasma processing apparatus 31. Part (not shown).
- the control unit controls the entire plasma processing apparatus 31 such as the gas flow rate in the gas supply unit 33 for plasma processing and the pressure in the processing container 32.
- the processing container 32 includes a bottom portion 41 located on the lower side of the holding table 34 and a side wall 42 extending upward from the outer periphery of the bottom portion 41.
- the side wall 42 is substantially cylindrical except for a part.
- An exhaust hole 43 for exhaust is provided in the bottom 41 of the processing container 32 so as to penetrate a part thereof.
- the upper side of the processing container 32 is open, and a lid 44 disposed on the upper side of the processing container 32, a dielectric window 36 described later, and a seal member interposed between the dielectric window 36 and the lid 44.
- the processing container 32 is configured to be hermetically sealed by an O-ring 45 as a sealing member.
- the plasma processing gas supply unit 33 is formed by providing a plurality of plasma processing gas supply holes 46 for supplying plasma processing gas in the processing vessel 32 in a part of the upper side of the side wall 42. .
- the plurality of gas supply holes 46 for plasma processing are provided at equal intervals in the circumferential direction.
- the plasma processing gas supply unit 33 is supplied with a plasma processing gas from a reactive gas supply source (not shown).
- the holding table 34 can hold the substrate W to be processed thereon by an electrostatic chuck (not shown).
- the holding table 34 can be set to a desired temperature by a temperature adjustment mechanism (not shown) provided inside.
- the holding base 34 is supported by an insulating cylindrical support portion 49 that extends vertically upward from the lower side of the bottom portion 41.
- the exhaust hole 43 described above is provided so as to penetrate a part of the bottom 41 of the processing container 32 along the outer periphery of the cylindrical support portion 49.
- An exhaust device (not shown) is connected to the lower side of the annular exhaust hole 43 via an exhaust pipe (not shown).
- the exhaust device has a vacuum pump such as a turbo molecular pump.
- the inside of the processing container 32 can be depressurized to a predetermined pressure by the exhaust device.
- the plasma generation mechanism 39 is provided outside the processing vessel 32, and is disposed at a position facing the microwave generator 35 that generates microwaves for plasma excitation and the holding table 34, and is generated by the microwave generator 35.
- a dielectric window 36 for introducing the microwaves into the processing container 32 and a plurality of slot holes 40 are provided.
- the dielectric window 36 is disposed above the dielectric window 36 and radiates the microwaves to the dielectric window 36. It includes a slot antenna plate 37 and a dielectric member 38 that is disposed above the slot antenna plate 37 and that propagates a microwave introduced by a coaxial waveguide 54 described later in the radial direction.
- a microwave generator 35 having a matching mechanism 51 is connected to an upper portion of a coaxial waveguide 54 for introducing a microwave through a mode converter 52 and a waveguide 53.
- the TE mode microwave generated by the microwave generator 35 passes through the waveguide 53, is converted to the TEM mode by the mode converter 52, and propagates through the coaxial waveguide 54.
- 2.45 GHz is selected as the frequency of the microwave generated by the microwave generator 35.
- the dielectric window 36 has a substantially disc shape and is made of a dielectric. Specific materials for the dielectric window 36 include quartz and alumina.
- the slot antenna plate 37 has a thin plate shape and a disk shape. As shown in FIG. 3, the plurality of slot-shaped slot holes 40 are provided so that a pair of slot holes 40 are orthogonal to each other in a substantially letter C shape, and the pair of slot holes 40 is circumferential. Are provided at predetermined intervals. Also in the radial direction, a plurality of pairs of slot holes 40 are provided at predetermined intervals.
- Microwaves generated by the microwave generator 35 are propagated through the coaxial waveguide 54 to the dielectric member 38 and radiated from the plurality of slot holes 40 provided in the slot antenna plate 37 to the dielectric window 36. Is done.
- the microwave transmitted through the dielectric window 36 generates an electric field immediately below the dielectric window 36 and generates plasma in the processing chamber 32. That is, the microwave plasma used for processing in the plasma processing apparatus 31 is generated by a radial line slot antenna (RLSA) including the slot antenna plate 37 and the dielectric member 38 having the above-described configuration.
- RLSA radial line slot antenna
- FIG. 4 is a graph showing the relationship between the distance from the lower surface 48 of the dielectric window 36 in the processing chamber 32 and the plasma electron temperature when plasma is generated in the plasma processing apparatus 31.
- FIG. 5 is a graph showing the relationship between the distance from the lower surface 48 of the dielectric window 36 in the processing container 32 and the electron density of the plasma when plasma is generated in the plasma processing apparatus 31.
- the region immediately below dielectric window 36, specifically, region 26 up to approximately 10 mm indicated by the alternate long and short dash line is called a so-called plasma generation region.
- the electron temperature is about 1.5 to 2.5 eV, which is relatively high, and the electron density is higher than 1 ⁇ 10 12 cm ⁇ 3 .
- a region 27 exceeding 10 mm indicated by a two-dot chain line is called a plasma diffusion region.
- the electron temperature is about 1.0 to 1.3 eV, at least lower than 1.5 eV, and the electron density is about 1 ⁇ 10 12 cm ⁇ 3 , and at least higher than 1 ⁇ 10 11 cm ⁇ 3 .
- the processing vessel 32 of the plasma processing apparatus 31 is excited by microwaves and is in such a plasma state. And the plasma processing with respect to the to-be-processed substrate W mentioned later is performed in a plasma diffusion region. That is, in the plasma processing step, processing using microwave plasma in the vicinity of the surface of the substrate to be processed has a plasma electron temperature lower than 1.5 eV and a plasma electron density higher than 1 ⁇ 10 11 cm ⁇ 3. It is.
- the plasma processing apparatus 31 can be moved to a first position on the upper side of the holding table 34 and a second position different from the first position and can supply a film forming gas
- An inner side end portion 64 that extends from the side wall 42 side of the processing container 32 and is connected to the head portion 62 to support the head portion 62.
- the head portion 62 is a first portion.
- a gas supply mechanism 61 is provided for supplying a film forming gas in a small volume region formed between the head unit 62 and the holding table 34 when being disposed at the position, and for adsorbing the film forming gas onto the substrate W to be processed. .
- the first and second positions will be described later.
- the small volume area refers to a small volume area formed between the head portion 62 and the holding table 34 as compared with a large volume area of the entire processing container 32.
- FIG. 6 is a view of a part of the head portion 62 as viewed from the direction of the arrow III shown in FIG.
- FIG. 7 is a cross-sectional view showing a part of the head portion 62 shown in FIG.
- the head portion 62 includes a thin disc-like disc portion 66 and an annular extending portion 67 extending in the plate thickness direction from the outer diameter side region of the disc portion 66. .
- the extension part 67 is substantially cylindrical and extends downward.
- the disc portion 66 is configured to be larger than the substrate W to be processed.
- the above-described first position is a position where the disc portion 66 covers the upper side of the holding table 34. In the first position, the upper surface 47 on the outer diameter side of the holding table 34 and the lower surface 70 constituting the extending portion 67 face each other.
- the head unit 62 is provided at a first position, that is, at a position facing the target substrate W held on the holding table 34 when the head unit 62 is arranged on the holding table 34, and the film forming gas is supplied to the head unit 62.
- a gas supply hole 68 to be supplied is included.
- a plurality of gas supply holes 68 are provided so that a part of the surface located on the lower side of the disc part 66 included in the head part 62 is opened.
- the plurality of gas supply holes 68 are provided substantially equally at predetermined intervals in the vertical and horizontal directions in FIG.
- a film forming gas can be supplied to the substrate W to be processed from the outside of the processing container 32 through the gas supply path 69 and the plurality of gas supply holes 68.
- the processing vessel 32 provided in the plasma processing apparatus 31 is formed such that a part of the side wall 42 extends outward, and is provided with an accommodating portion 71 that can accommodate the head portion 62.
- the accommodating portion 71 is formed so as to extend straight from a part of the side wall 42 toward the outer side.
- region in this accommodating part 71 becomes the 2nd position where the head part 62 in the plasma processing apparatus 31 shown in FIG. 2 can move.
- the head unit 62 is movable to the first position above the holding table 34 and the second position inside the storage unit 71. That is, the head unit 62 is movable in the direction of the direction or vice versa arrow A 1 shown in FIG.
- positioned in the 1st position is shown in FIG. 2, and the case where the head part 62 is arrange
- FIG. 8 is a schematic cross-sectional view showing a state in which the head portion 62 is accommodated in the accommodating portion 71 in the plasma processing apparatus 31 shown in FIG.
- the plasma processing apparatus 31 is provided with a shielding plate 72 as a blocking mechanism that blocks a region in the storage unit 71 and a region outside the storage unit 71, here a region from the processing container 32.
- the shielding plate 72, along the inner wall surface 73 of the side wall 42 is movable in the direction of the direction or vice versa arrow A 2 in Fig.
- FIG. 8 shows a case where the shielding plate 72 shields the area inside the accommodating portion 71 and the area outside the accommodating portion 71.
- FIG. 9 is a flowchart showing typical processing steps when a substrate to be processed is formed using the plasma processing apparatus shown in FIG.
- Table 1 is a table showing the flow of processing and processing conditions. Note that the temperature of the holding table 34 at the time of plasma processing, which will be described later, is selected, for example, from 100 to 600 ° C., and preferably from 300 to 400 ° C.
- a substrate W on which a semiconductor element is to be formed is held on a holding table 34 by an electrostatic chuck.
- FIG. 9A a film forming gas is adsorbed on the substrate W to be processed.
- the head unit 62 is moved to the first position, that is, above the holding table 34 on which the substrate W to be processed is held. And the inside of the small volume area
- FIG. 9A a film forming gas is adsorbed on the substrate W to be processed
- FIG. 10 is a graph showing the relationship between the gas flow rate in the entire processing container and the arrival time until a predetermined pressure is reached.
- FIG. 11 is a graph showing the relationship between the gas flow rate in the small volume region formed between the holding base 34 and the head portion 62 and the arrival time until a predetermined pressure is reached. 10 and 11, the vertical axis indicates the arrival time (seconds), and the horizontal axis indicates the gas flow rate (sccm). The gas flow rate is shown in terms of Ar (argon) gas.
- the graphs shown in FIGS. 10 and 11 are graphs when the pressure is increased from 1 Torr to 3 Torr. In the case shown in FIG. 10, the total volume of the processing container is about 54 liters. In the case shown in FIG. 11, the volume of the small volume area formed between the holding base 34 and the head portion 62 is 0.75 liter.
- the time required to reach 3 Torr is significantly shorter in the case shown in FIG. 11 at any gas flow rate.
- region formed between the holding stand 34 and the head part 62 is 50% or less of the whole volume of the processing container 32, for example. Further, it is more preferable that the volume of the small volume region is within 20% of the entire volume of the processing container 32.
- the volume of the small volume region is approximately 1.4% of the total volume of the processing container 32.
- a film forming gas is supplied from the gas supply hole 68 toward the substrate W to be processed.
- the film forming gas containing the precursor gas is supplied so as to be ejected from the plurality of gas supply holes 68.
- one layer of gas is adsorbed on the substrate W to be processed. In this case, approximately one molecular layer containing silicon atoms is formed.
- the head unit 62 After the film forming gas is adsorbed on the substrate W to be processed, the head unit 62 is moved to the second position and retracted to the accommodating unit 71. After the head part 62 is accommodated in the accommodating part 71, the shielding plate 72 is moved upward, and the inside of the accommodating part 71 and the outside of the accommodating part 71 are blocked by the shielding plate 72.
- step (B) in Table 1 As a physical adsorption removal process for removing the film forming gas containing the unadsorbed precursor gas, an exhaust and purge process in the processing container 32 is performed (FIG. 9). (B)).
- the processing container 32 is exhausted using the exhaust hole 43 and an exhaust device.
- step (C) in Table 1 plasma processing using microwaves is performed (FIG. 9C).
- a plasma processing gas including a plasma excitation gas and a reactive gas is supplied from the plasma processing gas supply unit 33 into the processing vessel 32.
- the reaction gas in this case is oxygen (O 2 ) gas.
- plasma is generated in the processing container 32 by the plasma generation mechanism 39, and the formed adsorption layer containing silicon atoms is subjected to plasma processing using microwaves.
- the plasma treatment using microwaves is termination treatment of an adsorption layer containing silicon molecules and oxidation treatment of silicon atoms. This plasma treatment is performed in the plasma diffusion region described above.
- the series of steps (A) to (C) is repeated until the desired film thickness is obtained.
- a film thickness of 1 nm to 500 nm is selected as the actual film thickness.
- a silicon oxide film is formed on the substrate W to be processed.
- etching of a desired portion is repeated on the substrate W to be processed, and a semiconductor element as shown in FIG. 1 is manufactured.
- Such processing is called PE-ALD processing using RLSA.
- Such an apparatus is also referred to as a PE-ALD apparatus using RLSA.
- the adsorption layer when the gas is adsorbed on the substrate to be processed, the adsorption layer can be formed in a small volume region formed between the holding base and the head portion. Then, the supply amount of the film forming gas in the adsorption process can be reduced, and the pressure adjustment between the adsorption process and the plasma treatment process can be shortened, and the film formation can be performed efficiently. Further, since the inner wall surface of the processing container is not exposed to the film forming gas, film formation and reaction product adhesion to the inner wall surface of the processing container can be suppressed. Then, the number of processes for cleaning the inner wall surface of the processing container can be reduced. In addition, the generation of particles can be suppressed. Therefore, according to such a plasma processing apparatus, a high-quality film can be efficiently formed.
- the head portion is accommodated in the accommodating portion and is shielded by the shielding plate, adhesion of reaction products due to the plasma treatment to the head portion and the inner wall surface of the accommodating portion during the plasma treatment is also reduced. be able to.
- the housing portion is formed so as to extend straight from a part of the side wall toward the outer side. You may decide to form it so that it may extend in the diagonal direction toward the outward side from a part.
- the volume of the accommodating portion and the size of the head portion may be substantially the same, and a shielding mechanism may be provided on the side wall of the head portion.
- the movement of the shielding plate is not limited to the vertical direction, but may be configured to be movable in the horizontal direction, the circumferential direction, and the oblique direction.
- FIG. 12 is a photomicrograph showing an enlarged cross section of the liner film treated with PE-ALD using RLSA, and shows a case where the aspect ratio is about 6.
- FIG. 13 is a photomicrograph showing an enlarged cross section of a liner film treated with PE-ALD using RLSA, and shows a case where the aspect ratio is about 3.
- the part indicated by the arrow B 2 in parts and 13 indicated by an arrow B 1 in FIG. 12, a liner film In the formation of the liner film, a gas containing BTBAS (bis-tertiary-butyl-amino-silane) is used as a precursor gas.
- BTBAS bis-tertiary-butyl-amino-silane
- the aspect ratio is 5.8.
- the aspect ratio is 3.4.
- the trench is completely covered and the film is formed by the liner film up to the deepest part of the trench both when the aspect ratio is about 6 and about 3.
- the film is formed so as to completely cover the above shape. Can do. Furthermore, since plasma processing is performed using microwave plasma, plasma damage during film formation can be greatly reduced. Therefore, according to such a film forming method, a high quality film can be formed.
- a silicon oxide film having high insulating properties can be formed at a low temperature in a semiconductor element. In this case, problems due to restrictions on the order of manufacturing processes can be avoided.
- the insulating film formed in this way is excellent in insulating performance.
- the semiconductor element including the insulating film formed in this way has a high quality because it includes an insulating film having excellent insulating performance.
- the head portion moves in the processing container so as to advance and retreat in the horizontal direction, that is, in the horizontal direction.
- the present invention is not limited to this. Further, it may be configured to be movable in the vertical direction.
- a heater and a sensor are provided inside the head portion and inside the support portion. The heater is turned on and off based on the temperature information from the sensor by the control unit provided in the plasma processing apparatus.
- the heater and the sensor may be provided so as to be attached to the outside of the head part or the support part.
- the set temperature at the time of temperature adjustment is arbitrarily set depending on the precursor gas used.
- a temperature range corresponding to the vapor pressure of the precursor gas to be used may be set.
- the temperature of the precursor gas used may be set to a temperature range of 10 Torr (1.333 ⁇ 10 3 Pa) or more, or the precursor gas used may have a vapor pressure of 100 Torr (1.333 ⁇ ).
- the temperature range may be 10 4 Pa) or more.
- FIG. 14 is a schematic cross-sectional view showing a part of the plasma processing apparatus in this case.
- a head portion 93 and a support portion 94 are provided in the processing container 92 of the plasma processing apparatus 91.
- the outer diameter side end portion 95 of the support portion 94 is attached to the inner wall surface 96 of the processing container 92.
- the head portion 93 and the support portion 94 are configured to be rotatable in the direction indicated by the arrow C in FIG. 14, that is, in the vertical direction, with the outer diameter side end portion 95 as the rotation center.
- the head portion 93 is disposed on the upper side of the holding base 97 as the first position.
- the head part 93 is arrange
- the head portion 93 is positioned above the holding table 97. Then, at the time of plasma processing, the support portion 94 is rotated in the direction indicated by the arrow C in FIG. 14 so that the head portion 93 is inclined to the second position, here the inner wall surface 96 side. And the plasma processing of the to-be-processed substrate W by microwave is performed. You may decide to comprise in this way.
- the head unit may be configured to include an exhaust mechanism.
- FIG. 15 is a view of a part of the head unit 101 provided in the plasma processing apparatus in this case as seen from the thickness direction, and corresponds to FIG. 16 is a cross-sectional view showing a part of the head unit 101 shown in FIG. 15, and corresponds to FIG.
- the overall configuration of the plasma processing apparatus including the head unit shown in FIGS. 15 and 16 is as shown in FIGS.
- the head unit 101 is provided with a plurality of gas supply holes 102 similar to the head unit shown in FIG. 6 and gas exhaust holes 103 for exhaust.
- a plurality of gas exhaust holes 103 are provided.
- the gas exhaust holes 103 are provided at substantially equal intervals in the vertical direction and the horizontal direction shown in FIG.
- a gas exhaust passage 104 serving as a passage for a film forming gas to be exhausted is provided in the head portion 101 and a support portion (not shown).
- the head unit 112 provided in the plasma processing apparatus 111 can rotate in the processing container 115 in the horizontal direction in the direction indicated by the arrow D with the base portion 114 of the support unit 113 as the rotation center. It is good also as a structure.
- the head unit 117 provided in the plasma processing apparatus 116 may be configured to be movable in the horizontal direction indicated by the arrow E in the processing container 119 together with the support unit 118 as shown in FIG.
- the configuration of the support portion 113 may be as follows. 25, 26, and 27 are schematic cross-sectional views showing the configuration in the vicinity of the root portion 114 of the support portion 113 shown in FIG.
- the cross section shown in FIG. 25 corresponds to the cross section when the vicinity of the root portion 114 of the support portion 113 is cut by a plane extending in the front and back direction in FIG. 17, and the cross section shown in FIG. 26 is the cross section shown in FIG. Is equivalent to the cross-section when rotated 90 degrees, and the cross-section shown in FIG. 27 corresponds to the XXVII-XXVII cross-section in FIG.
- the root portion 114 of the support portion 113 is provided with a rotatable movable portion 151 and a fixed portion 152 fixed to the base 153.
- fixed part 152 the part located in the downward side is attached to the base 153 used as a base, and is being fixed.
- the movable portion 151 rotates about 90 degrees in the direction indicated by the arrow D in FIGS. 17 and 27 around the rotation center axis 154 extending in the vertical direction of the drawing as indicated by the one-dot chain line in FIGS. Can do.
- a gas supply passage 155 leading to a gas supply hole (not shown) for supplying gas to the head portion side and a passage for a film forming gas to be exhausted are provided, and a gas exhaust hole (see FIG. And a gas exhaust passage 156 leading to (not shown).
- the gas supply path 155 and the gas exhaust path 156 are doubled in the support portion 113 so that the gas supply path 155 is located on the inner side and the gas exhaust path 156 is located on the outer side. That is, gas is supplied in the direction indicated by arrow H 1 in FIG. 26, the gas is exhausted in the direction indicated by the arrow H 2 in FIG.
- the gas exhaust path 156 is provided outside, and thus leaks into the gas exhaust path 156. Gas enters and is exhausted. If it does so, the gas which leaked from the gas supply path 155 will not leak to another part. Therefore, the gas from the gas supply path 155 can be supplied to the head portion more safely and reliably.
- the gas supply paths 155 may be provided in a multiple of double or more, and the gas exhaust paths 156 may be provided in a multiple of double or more.
- the gas supply mechanism is configured to include a support portion that extends from the side wall side, the inner side portion is connected to the head portion, and supports the head portion, and the exhaust mechanism is an exhaust gas exhausted inside the support portion.
- the gas supply mechanism includes an exhaust passage serving as a gas passage, the gas supply mechanism includes a gas supply passage serving as a passage of the gas to be supplied inside the support portion, and the gas supply passages are multiplexed so as to be inside the gas exhaust passage. What is necessary is just to be provided.
- the head portion may be configured to be able to go back and forth between two or more processing containers.
- FIG. 19 is a schematic cross-sectional view showing a part of the plasma processing apparatus in this case.
- the plasma processing apparatus 121 includes a first processing container 122a located on the left side in FIG. 19 and a second processing container 122b located on the right side.
- the first processing container 122a and the second processing container 122b are provided so as to share the side wall 123 positioned therebetween.
- the processing vessels 122a and 122b are provided with holding bases 124a and 124b, a plasma processing gas supply unit, dielectric windows 125a and 125b, and the like. Then, plasma processing can be performed on the substrate W to be processed in each of the processing containers 122a and 122b.
- only one gas supply mechanism including the head portion 126 is provided in the plasma processing apparatus.
- the head portion 126 is configured to be movable between the first processing container 122a and the second processing container 122b.
- a first shutter 128a and a second shutter 128b that can open and close the opening 127 are provided on the first and second processing containers 122a and 122b. Specifically, the head portion 126 can go back and forth between the first processing container 122a and the second processing container 122b through the opening 127.
- an efficient film formation process can be performed. That is, for example, while the plasma processing of the substrate W to be processed is performed in the second processing container 122b on one side, the head unit 126 is moved to the first processing container 122a on the other side, and the first The gas adsorption process for the substrate W to be processed is performed by the head unit 126 in the processing container 122a.
- efficient film formation is possible. In this case, the plasma generator and the like can be shared by the processing in the two processing containers.
- the plasma processing apparatus is configured to include a target substrate moving mechanism capable of at least one of supporting the target substrate on the holding table and removing the target substrate supported on the holding table. May be.
- FIG. 28 is a schematic diagram schematically showing the configuration of the plasma processing system in this case.
- the plasma processing system 161 serves as a carry-in port for the substrate to be processed W before processing and a carry-out port for the substrate to be processed W after processing, and the substrate W to be processed between the plasma processing system 161 and the outside.
- Each of the holding bases 167a and 167b provided in each plasma processing apparatus 181a and 181b can support the four substrates to be processed W, respectively.
- the supporting regions of the four substrates to be processed W on the holding table 167a are indicated by regions 168a, 168b, 168c, 168d indicated by alternate long and short dash lines in FIG.
- the support areas of the four substrates to be processed W on the holding base 167b are indicated by areas 168e, 168f, 168g, 168h indicated by alternate long and short dash lines in FIG.
- the holding bases 167a and 167b are capable of mounting four substrates to be processed W.
- the holders 167a and 167b are not limited to this, and for example, two or more substrates to be processed W may be mounted. .
- FIG. 29 is a schematic perspective view schematically showing the vicinity of the holding table 167a.
- three pins (not shown) are used for supporting substrate W to be processed on holding table 167a and removing substrate W to be processed from holding table 167a. Support and removal of the substrate W to be processed by the pins will be described later.
- three pin holes 172a, 172b, and 172c which are three pin installation regions in the region 168a of the holding table 167a, are shown. Illustration of pin holes in the other regions 168b to 168d is omitted.
- the three pin holes 172a to 172c are provided at positions that form an equilateral triangle when they are connected by virtual lines. That is, the three pin holes 172a to 172c are provided at portions located at the corners of a virtual equilateral triangle.
- One plasma processing apparatus 181a including the holding table 167a is provided with the head unit 169 described above.
- the head unit 169 is attached to the support unit 170.
- Head portion 169, as the center of rotation of the base portion 171 made of an outer side end portion of the support portion 170 is rotatable 360 degrees in the direction indicated by the arrow J 1 in FIG. 29.
- the holding table 167a as the rotation around the center of the base portion 171 is rotatable 360 degrees in the direction indicated by the arrow J 2 in Figure 29.
- the rotating holding table 167a and the pins described above are capable of at least one of supporting the substrate to be processed on the holding table and removing the substrate to be processed supported on the support table.
- the other plasma processing apparatus 181b including the holding table 167b is provided with the head portion 173, the support portion 174a, and the root portion 175 described above.
- a placement unit 176 on which the substrate W to be processed can be placed thereon is provided at a position facing the head unit 173 by 180 degrees with the root portion 175 as the center.
- the placement portion 176 is supported by the support portion 174b.
- the support portion 174a that supports the head portion 173 and the support portion 174b that supports the mounting portion 176 are provided so as to be substantially in a straight line with the root portion 175 interposed therebetween.
- the mounting portion 176 has an L-shaped cross section and has a substantially semicircular shape when viewed from the direction of the rotation center axis.
- the placement unit 176 can place the substrate W to be processed on the upper surface having an L-shaped cross section.
- the head portion 173 and the placement portion 176 can rotate 360 degrees with the center of the root portion 175 as the center of rotation.
- the substrate W to be processed supported by the four support regions 168e to 168h can be loaded and unloaded. it can.
- three pin holes 177a, 177b, and 177c which are three pin installation areas in the area 168e of the holding table 167b, are shown. Illustration of pin holes and pins in the other regions 168f to 168h is omitted.
- FIG. 32, FIG. 33, and FIG. 34 are schematic cross-sectional views showing a part of the holding table 167b when the substrate W to be processed is supported and removed by the pins.
- a substrate to be processed W is supported in a region 168e on the holding table 167b.
- Pins 178a and 178b and pin holes 177a and 177b are provided in the region 168e where the target substrate W is supported.
- the pins 178a and 178b are provided in the pin holes 177a and 177b, respectively.
- illustration of the pin holes 177c and the pins provided in the pin holes 177c is omitted from the viewpoint of easy understanding.
- the pins 178a and 178b are movable in the vertical direction on the paper surface in FIG.
- the pins 178a and 178b arranged in the pin holes 177a and 177b respectively move upward in the drawing.
- the lower surface 179 of the substrate to be processed W is pushed by the upper ends of the pins 178a and 178b, and the substrate to be processed W moves upward.
- the substrate to be processed W is placed on the upper ends of the pins 178a and 178b.
- W can be placed.
- the mounting portion 176 rotates and moves to the position of the support region 168e. Then, the lower surface 179 of the substrate W to be processed comes to a position facing the upper surface 180 having an L-shaped cross section in the mounting portion 176.
- the portion located on the outer side of the mounting portion 176 arrives faster due to the rotation, so the portion located on the outer side is indicated by a solid line, and the portion located on the inner side is indicated by a dotted line Is shown.
- the pins 178a and 178b are moved downward. Then, the lower surface 179 of the substrate to be processed W is placed on the upper surface 180 of the placement unit 176. Then, the substrate W to be processed is moved out of the support region 168e by the rotation of the mounting portion 176.
- the pin is raised, In a state where the substrate to be processed W is lifted, the mounting portion 176 is rotated to move out of the region 168f, and then the pin is lowered to be supported by the region 168f.
- the substrate W to be processed can be supported on the holding table 167b and removed from the holding table 167b efficiently.
- the mounting portion and the pin described above can move the substrate to be processed so that at least one of the support of the substrate to be processed on the holding table and the removal of the substrate to be processed supported on the support table can be performed.
- the present invention is not limited to this, and four or more pins may be provided. Furthermore, it is only necessary that the pin can be placed on the upper end of the pin in a stable state, and the three pins are not necessarily provided at the position of the equilateral triangle. Further, for example, the tip of the pin may be flat, and in this case, the substrate W to be processed can be temporarily placed in a stable state even if the number of pins is one or two.
- the head part provided in the gas supply mechanism is provided with a disk part.
- the present invention is not limited to this, and the head part includes a rod-like part extending in the horizontal direction in the processing container.
- the rod-shaped portion may be configured so that the region on the substrate to be processed held on the holding table can be moved in the horizontal direction.
- FIG. 20 is a schematic cross-sectional view showing the main part of the plasma processing apparatus 131 in this case, and corresponds to FIG.
- FIG. 21 is a perspective view showing a part of a rod-like portion provided in the plasma processing apparatus.
- the head portion 133 included in the gas supply mechanism provided in the plasma processing apparatus 131 includes a rod-like portion 134 that extends in the horizontal direction in the processing container 132.
- the rod-shaped part 134 has a substantially perfect outer shape when cut in a cross section perpendicular to the longitudinal direction.
- a root portion 135 that is one end of the rod-shaped portion 134 is attached to the side wall 136 of the processing container 132. That is, the rod-shaped portion 134 is supported by the side wall 136.
- 10 mm is selected as the distance between the lowermost portion of the rod-shaped portion 134 and the holding table 34.
- the rod-shaped portion 134 is configured to cover a part of the substrate W to be processed when positioned on the upper side of the holding table 34.
- the rod-shaped part 134 has a hollow shape.
- the hollow portion located on the inner side of the rod-shaped portion 134 becomes a gas supply path 137 provided in the head portion and the support portion of the gas supply mechanism provided in the plasma processing apparatus shown in FIG.
- a gas supply hole 138 is provided so as to be connected to the gas supply path 137 from a surface facing the target substrate W on the lower side of the rod-shaped portion 134.
- a plurality of gas supply holes 138 are provided at predetermined intervals in the longitudinal direction of the rod-like portion 134.
- FIG. 22 is a schematic cross-sectional view showing the main part of the plasma processing apparatus 131 shown in FIG. 20, and is a view of the plasma processing apparatus 131 viewed from above.
- the rod-like portion 134 is movable in the horizontal direction on the region on the substrate W to be processed held on the holding table 34.
- the rod-like portion 134 is configured to be rotatable with the root portion 135 as the rotation center.
- the upper side of the substrate W to be processed is the first position
- the position avoiding the upper side of the substrate W to be processed is the second position.
- the outer shape of the side wall 136 of the plasma processing apparatus 131 is rectangular. Even with the plasma processing apparatus 131 having such a configuration, the same effects as described above can be obtained. Further, since such a rod-shaped portion has a relatively simple structure, the cost can be reduced when the rod-shaped portion 134 is manufactured. In this case, the small volume area is an area formed between the rod-shaped portion 134 and the holding table 34.
- the rod-like portion 134 provided in the plasma processing apparatus 139 may be configured to be movable in the direction of arrow G shown in FIG. .
- FIG. 24 is a cross-sectional view showing a part of the rod-like portion in this case, and corresponds to FIG. Referring to FIG. 24, the hollow portion located on the inner side of rod-shaped portion 141 is partitioned by wall portion 142. The hollow portion on one side partitioned by the wall 142 serves as the gas supply path 143 described above, and the hollow portion on the other side serves as the gas exhaust path 144. Similarly to the rod-shaped portion 134 shown in FIG. 21 described above, a gas supply hole 145 for supplying a deposition gas to the substrate W to be processed is provided at a predetermined interval in the longitudinal direction so as to be connected to the gas supply path 143. A plurality are provided.
- the gas exhaust passage 144 is also provided with a plurality of gas exhaust holes 146 for exhausting a small volume region with a predetermined interval in the longitudinal direction.
- a configuration may be adopted.
- the outer shape of the cross section of the rod-shaped portion 141 is a rectangular shape.
- the holding table may be configured to be movable in at least one of the vertical direction and the horizontal direction.
- plasma processing and gas adsorption can be performed more appropriately. Specifically, for example, when the head unit is arranged at the first position, the holding base is moved closer to the head unit in conjunction with the movement of the head unit.
- the present invention is not limited to this, and the present invention is also applicable to the case where silicon atoms are nitrided. That is, after the above-described gas adsorption step, a nitride-containing gas, for example, N 2 gas is supplied into the processing container and plasma processing is performed to form a silicon nitride film. This also applies to such a case.
- a nitride-containing gas for example, N 2 gas
- a gas containing BTBAS is used as a precursor gas for gas adsorption, but other gas containing silicon may be used as a matter of course. Also in the plasma treatment, a gas other than oxygen gas can be used.
- plasma may always be generated regardless of the movement of the head portion. By doing so, it is possible to further improve the throughput.
- the present invention may be applied to formation of a gate oxide film or other insulating layer in a MOS transistor, for example, an interlayer insulating film or a gate sidewall.
- the present invention is also effectively applied to CCDs and LSIs.
- the present invention is applied to all film forming processes in which a gas adsorption process for supplying a film forming gas to form an adsorption layer and a plasma treatment process are combined.
- the film include the following. That is, as a gate insulating film, SiO 2 , H 2 O 3 , HfO 2 , ZrO 2 , Ta 2 O 5 , La 2 O 3 , DRAM (Dynamic Random Access Memory) as a trench capacitor, SiO 2 , HfO 2 , Al As gate oxide films for 3D devices such as 2 O 3 , Ta 2 O 5 , FinFET (Field Effect Transistor), etc., SiO 2 , Al 2 O 3 , HfO 2 , ZrO 2 , Ta 2 O 5 , La 2 O 3 , MEMS as (Micro Electro Mechanical Systems) nanolaminate, HfO 2, Ta 2 O 5 , TiO 2, Ta 2 O 5, Al 2 O 3, ZnO as a UV block layer, TiO 2, organic EL (Electro Lum for Al 2 O 3 Nescence) element is an alumina insulating film, as an optical device or a solar cell or the like, AlTiO, SnO 2,
- an exhaust process for exhausting the inside of the processing vessel may be performed between the gas adsorption process and the plasma processing process. Further, an exhaust process may be performed after the plasma treatment process.
- the plasma processing gas is supplied from the gas supply hole provided in the side wall.
- the present invention is not limited thereto, and the gas supply is jetted toward the center of the substrate to be processed.
- the hole may be provided in the central region of the dielectric window and supplied from the gas supply hole.
- a thin plate-like focus ring may be provided on the outer diameter side of the substrate to be processed held on the holding table.
- the extension portion is positioned above the annular focus ring as the first position.
- the configuration including such a focus ring is advantageous in the following points.
- the head portion In the first position, the head portion is arranged so as to cover the substrate to be processed, and film formation or the like is performed also on the periphery of the substrate to be processed, specifically on the focus ring located on the outer diameter side of the substrate to be processed. Will be made.
- the focus ring replaceable, the problem of film formation on the outer diameter side of the substrate to be processed can be solved.
- the plate thickness of the focus ring it is possible to adjust the gap between the head portion and the holding table.
- the plasma processing is performed by the microwave by RLSA using the slot antenna plate.
- the present invention is not limited to this, and the microwave plasma processing apparatus having a comb-shaped antenna unit is used. Also good.
- the plasma processing apparatus uses a microwave as a plasma source.
- the present invention is not limited thereto, and is not limited to ICP (Inductively-coupled Plasma), ECR (Electron Cyclotron Resonance) plasma, parallel plate type plasma.
- the present invention is also applicable to a plasma processing apparatus using a plasma source as a plasma source, and is not limited to plasma generation means.
- the plasma processing apparatus and the gas supply mechanism for the plasma processing apparatus according to the present invention are effectively used when efficient production of a high-quality film is required.
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Abstract
Description
Claims (22)
- 下方側に位置する底部および前記底部の外周側から上方側に延びる側壁を含み、密封可能であって、その内部において被処理基板にプラズマ処理を行う処理容器と、
前記処理容器内に配置され、その上に前記被処理基板を保持する保持台と、
前記処理容器内にプラズマを発生させるプラズマ発生手段と、
前記保持台の上方側となる第一の位置および前記第一の位置と異なる第二の位置に移動可能であってガスを供給可能なヘッド部を含み、前記ヘッド部が前記第一の位置に配置された際に前記ヘッド部と前記保持台との間に形成される小容積領域において成膜ガスを供給し、前記被処理基板上に成膜ガスを吸着させるガス供給機構とを備える、プラズマ処理装置。 - 前記ヘッド部は、略円板状の円板部を含み、
前記ヘッド部が前記第一の位置に配置された際に、前記円板部は、前記保持台の上方側を覆う、請求項1に記載のプラズマ処理装置。 - 前記ヘッド部は、前記処理容器内において水平方向に延びる棒状部を含み、
前記棒状部は、前記保持台上に保持された前記被処理基板上の領域を水平方向に移動可能である、請求項1に記載のプラズマ処理装置。 - 前記ガス供給機構は、前記ヘッド部のうち、前記ヘッド部が前記第一の位置に配置された際に前記保持台上に保持された前記被処理基板に対向する位置に設けられ、成膜ガスを供給するガス供給孔を含む、請求項1に記載のプラズマ処理装置。
- 前記ガス供給機構は、前記ヘッド部が前記第一の位置に配置された際に、前記ヘッド部と前記保持台との間に形成される小容積領域の排気を行う排気機構を含む、請求項1に記載のプラズマ処理装置。
- 前記排気機構は、前記ヘッド部のうち、前記ヘッド部が前記第一の位置に配置された際に前記保持台上に保持された前記被処理基板に対向する位置に設けられ、前記保持台と前記ヘッド部との間に形成される小容積領域の排気を行う排気孔を含む、請求項5に記載のプラズマ処理装置。
- 前記ヘッド部が前記第一の位置に配置された際に、前記ヘッド部と前記保持台との間に形成される小容積領域の容積は、前記処理容器の容積の50%以下である、請求項1に記載のプラズマ処理装置。
- 前記ヘッド部は、上下方向および水平方向のうち、少なくともいずれか一方方向に移動可能である、請求項1に記載のプラズマ処理装置。
- 前記ガス供給機構は、前記側壁側から延び、内方側部分が前記ヘッド部に連結され、前記ヘッド部を支持する支持部を含む、請求項1に記載のプラズマ処理装置。
- 前記ヘッド部は、前記支持部の外方側端部を中心に回転可能である、請求項9に記載のプラズマ処理装置。
- 前記ヘッド部および前記支持部の温度を調整可能な温度調整機構を含む、請求項9に記載のプラズマ処理装置。
- 前記ガス供給機構は、前記側壁側から延び、内方側部分が前記ヘッド部に連結され、前記ヘッド部を支持する支持部を含み、
前記排気機構は、前記支持部の内部に、排気された排気ガスの通路となる排気路を含み、
前記ガス供給機構は、前記支持部の内部に、供給するガスの通路となるガス供給路を含み、
前記ガス供給路は、前記ガス排気路の内側となるように多重に設けられている、請求項5に記載のプラズマ処理装置。 - 前記保持台上への前記被処理基板の支持および前記保持台上に支持された前記被処理基板の取り外しのうちの少なくともいずれか一方が可能である被処理基板移動機構を備える、請求項1に記載のプラズマ処理装置。
- 前記処理容器には、前記側壁の一部が外方側に延びるようにして形成されており、前記ヘッド部を収容可能な収容部が設けられている、請求項1に記載のプラズマ処理装置。
- 前記収容部内の領域と前記収容部外の領域とを遮断可能な遮断機構を備える、請求項14に記載のプラズマ処理装置。
- 前記遮断機構は、前記側壁の内方側の壁面に沿って移動可能な遮蔽板を含む、請求項15に記載のプラズマ処理装置。
- 前記処理容器は、第一の処理容器と、前記第一の処理容器とは異なる第二の処理容器とを備え、
前記ヘッド部は、前記第一の処理容器と第二の処理容器との間を移動可能である、請求項1に記載のプラズマ処理装置。 - 前記保持台は、上下方向および水平方向のうち、少なくともいずれか一方方向に移動可能である、請求項1に記載のプラズマ処理装置。
- 前記プラズマ発生手段は、プラズマ励起用のマイクロ波を発生させるマイクロ波発生器と、前記保持台と対向する位置に設けられ、マイクロ波を前記処理容器内に導入する誘電体窓とを含む、請求項1に記載のプラズマ処理装置。
- 前記プラズマ発生手段は、複数のスロット孔が設けられており、前記誘電体窓の上方側に配置され、マイクロ波を前記誘電体窓に放射するスロットアンテナ板を含む、請求項19に記載のプラズマ処理装置。
- 下方側に位置する底部および前記底部の外周側から上方側に延びる側壁を含み、密封可能であって、その内部において被処理基板にプラズマ処理を行う処理容器と、前記処理容器内に配置され、その上に前記被処理基板を保持する保持台と、前記処理容器内にプラズマを発生させるプラズマ発生手段とを備えるプラズマ処理装置に備えられ、
前記保持台の上方側となる第一の位置および前記第一の位置と異なる第二の位置に移動可能であってガスを供給可能なヘッド部を含み、前記ヘッド部が前記第一の位置に配置された際に前記ヘッド部と前記保持台との間に形成される小容積領域において成膜ガスを供給し、前記被処理基板上に成膜ガスを吸着させる、プラズマ処理装置用ガス供給機構。 - 前記第一の位置に配置された際に、前記保持台上に保持された被処理基板に対向する位置に、前記保持台と前記ヘッド部との間に形成される小容積領域の排気を行う排気孔を含む、請求項21に記載のプラズマ処理装置用ガス供給機構。
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Also Published As
Publication number | Publication date |
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JPWO2011034057A1 (ja) | 2013-02-14 |
JP5454575B2 (ja) | 2014-03-26 |
TW201142944A (en) | 2011-12-01 |
KR20120063484A (ko) | 2012-06-15 |
CN102239544A (zh) | 2011-11-09 |
US20120186521A1 (en) | 2012-07-26 |
US8967082B2 (en) | 2015-03-03 |
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