WO2010058642A1 - プラズマ処理装置およびプラズマ処理方法 - Google Patents
プラズマ処理装置およびプラズマ処理方法 Download PDFInfo
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- WO2010058642A1 WO2010058642A1 PCT/JP2009/064778 JP2009064778W WO2010058642A1 WO 2010058642 A1 WO2010058642 A1 WO 2010058642A1 JP 2009064778 W JP2009064778 W JP 2009064778W WO 2010058642 A1 WO2010058642 A1 WO 2010058642A1
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- substrate
- plasma processing
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- holding table
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- 238000012545 processing Methods 0.000 title claims abstract description 259
- 238000003672 processing method Methods 0.000 title claims description 12
- 239000000758 substrate Substances 0.000 claims abstract description 203
- 239000012495 reaction gas Substances 0.000 claims abstract description 195
- 239000007789 gas Substances 0.000 claims description 152
- 230000005284 excitation Effects 0.000 claims description 6
- 238000005530 etching Methods 0.000 description 16
- 239000002245 particle Substances 0.000 description 12
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- 239000007795 chemical reaction product Substances 0.000 description 4
- 238000009616 inductively coupled plasma Methods 0.000 description 4
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- 238000001020 plasma etching Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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- 239000007921 spray Substances 0.000 description 2
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/3244—Gas supply means
-
- 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
- C23C16/448—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 generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials
- C23C16/452—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 generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials by activating reactive gas streams before their introduction into the reaction chamber, e.g. by ionisation or addition of reactive species
-
- 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
- C23C16/45563—Gas nozzles
- C23C16/4558—Perforated rings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32192—Microwave generated discharge
Definitions
- the present invention relates to a plasma processing apparatus and a plasma processing method, and more particularly to a plasma processing apparatus and a plasma processing method for generating plasma using a microwave as a plasma source.
- a semiconductor device such as an LSI (Large Scale Integrated circuit) is manufactured by performing a plurality of processes such as etching, CVD (Chemical Vapor Deposition), and sputtering on a semiconductor substrate (wafer) that is a substrate to be processed.
- processing such as etching, CVD, and sputtering
- plasma as an energy supply source, that is, plasma etching, plasma CVD, plasma sputtering, and the like.
- the types of plasma include parallel plate type plasma, ICP (Inductively-Coupled Plasma), ECR (Electron Cyclotron Resonance) plasma, and the like. Plasma generated by various apparatuses is used for processing.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-165374 (Patent Document 1) and Japanese Patent Application Laid-Open No. 6-112163 (Patent Document 2).
- Patent Document 2 in a plasma processing apparatus using ECR plasma, an annular gas ring is provided between a mounting table on which a substrate to be processed is mounted and a main coil. The gas ring is formed with a larger diameter than the mounting table. The reactive gas is supplied by this gas ring.
- Patent Document 2 in the plasma processing apparatus using ECR plasma, the introduction port of the deposition gas is arranged in the vicinity of the sample holder.
- FIG. 21 is a schematic cross-sectional view showing a part of the plasma processing apparatus 101 provided with reaction gas supply units for supplying a reaction gas into the processing container at two locations.
- the first is formed in the central portion of the dielectric plate 103 that introduces microwaves into the processing container 102.
- the reactive gas supply unit 104 is provided.
- the reaction gas is supplied so as to be sprayed to the central region of the substrate W to be processed.
- a second reaction gas supply unit 106 is provided on the upper side of the side wall 105 of the processing container 102 in order to supply the reaction gas to the end region of the substrate W to be processed. Note that the plasma processing apparatus 101 being processed is exhausted downward by an exhaust apparatus (not shown) located on the lower side in FIG.
- the reaction gas is supplied into the processing vessel 102 in a viscous flow pressure region (approximately 50 mTorr or more), from the second reaction gas supply portion 106.
- the supplied reactive gas flows in the central direction indicated by the arrow X in FIG. 21 due to the influence of the first reactive gas supply unit 104. That is, the reaction gas supplied from the second reaction gas supply unit 106 becomes the same supply path as the reaction gas supplied from the first reaction gas supply unit 104. Therefore, the effect of supplying the reactive gas from the second reactive gas supply unit 106 is not recognized, and the reactive gas supplied to the central region of the target substrate W is directed from the central region of the target substrate W toward the end region. As a result, the reaction gas is consumed and the reaction products are increased toward the end portion, and the processing state is distributed in the radial direction of the substrate W to be processed, resulting in in-plane non-uniformity. .
- the reaction gas supplied from the second reaction gas supply unit 106 flows downward in the direction indicated by the arrow Y in FIG. End up. Then, the reaction gas supplied from the second reaction gas supply unit 106 is exhausted without reaching the substrate W to be processed. Therefore, almost all of the reaction gas that reaches the substrate to be processed W is supplied only from the first reaction gas supply unit 104, and in-plane non-uniformity occurs in the processing state of the substrate to be processed W as described above.
- FIG. 22 is a schematic sectional view showing a part of the plasma processing apparatus 111 in this case, and corresponds to the section shown in FIG.
- the plasma processing apparatus 111 is provided with a first reactive gas supply unit 113 at the center of the dielectric plate 112, and directly above the substrate W to be processed held by the holding table 114.
- An annular second reactive gas supply unit 115 is provided in the region. The second reactive gas supply unit 115 supplies the reactive gas in a direction directly downward toward the end region of the substrate W to be processed.
- reaction gas supplied from the first reaction gas supply unit 113 and the reaction gas supplied from the second reaction gas supply unit 115 are separated from the central region of the substrate W to be processed.
- region 116 between the radial directions of the end regions collisions will occur.
- a region 116 is indicated by a dotted line. Then, a reaction gas stagnates in this region 116, and deposition (reaction product) tends to stay.
- the etching rate of the substrate W to be processed in the region 116 differs from the etching rate of the substrate W to be processed in the central region and the end region due to the retention of deposition and the influence of the plasma shield as described above. In-plane uniformity in the process is impaired.
- An object of the present invention is to provide a plasma processing apparatus capable of improving in-plane uniformity in processing of a substrate to be processed.
- Another object of the present invention is to provide a plasma processing method capable of improving in-plane uniformity in processing of a substrate to be processed.
- a plasma processing apparatus includes a processing container that performs plasma processing on a substrate to be processed therein, a holding base that is disposed in the processing container and holds the substrate to be processed, and a plasma in the processing container.
- Plasma generating means for generating and a reaction gas supply unit for supplying a reaction gas for plasma processing into the processing container are provided.
- the reactive gas supply unit includes a first reactive gas supply unit that supplies a reactive gas in a direction directly downward toward a central region of the substrate to be processed held on the holding table, and a target gas held on the holding table.
- a second position is provided at a position avoiding the region directly above the processing substrate and directly above the holding table, and supplies the reaction gas toward the center of the substrate to be processed held on the holding table.
- a reaction gas supply unit is provided.
- the plasma processing apparatus having such a configuration supplies a first reaction gas supply unit that supplies a reaction gas in a downward direction toward the central region of the substrate to be processed, and a reaction gas that is supplied toward the center of the substrate to be processed.
- the reaction gas can be uniformly supplied to the entire substrate to be processed by the second reaction gas supply unit.
- the reaction gases supplied from the first and second reaction gas supply units are not allowed to stagnate on the substrate to be processed, and deposition (reaction product) retention can be suppressed.
- the flow of plasma reaching the substrate to be processed is not blocked by the second reactive gas supply unit. Therefore, in-plane uniformity in processing of the substrate to be processed can be improved.
- the region directly above refers to a region directly above the substrate to be processed.
- the center side of the substrate to be processed refers to a central region of the substrate to be processed and a vertically upper side of the central region of the substrate to be processed.
- the second reactive gas supply unit is disposed in the vicinity of the holding table.
- the second reactive gas supply unit supplies the reactive gas in an oblique direction toward the central region of the substrate to be processed held on the holding table.
- the second reaction gas supply unit may supply the reaction gas in a lateral direction toward the center side of the substrate to be processed held on the holding table.
- the second reactive gas supply part includes an annular part, and the annular part is provided with a supply hole for supplying a reactive gas.
- the substrate to be processed is disk-shaped, the annular portion is annular, and the inner diameter of the annular portion is larger than the outer diameter of the substrate to be processed.
- the processing container may include a bottom portion located on the lower side of the holding table and a side wall extending upward from the outer periphery of the bottom portion, and the second reaction gas supply unit may be embedded in the side wall.
- the side wall includes a protruding portion that protrudes inward, and the second reactive gas supply portion is embedded in the protruding portion.
- the plasma generating means includes a microwave generator that generates a microwave for plasma excitation, a dielectric plate that is provided at a position facing the holding table, and introduces the microwave into the processing container.
- the first reactive gas supply unit is provided at the center of the dielectric plate.
- a first temperature adjusting unit that adjusts the temperature of the central region of the substrate to be processed held by the holding table, and an end portion that is positioned around the central portion of the substrate to be processed held by the holding table.
- a second temperature adjusting unit that adjusts the temperature of the region.
- At least one of the first and second temperature adjustment units is composed of a plurality of members.
- each of the first and second temperature adjustment units is provided inside the holding table.
- the processing container includes a bottom part positioned on the lower side of the holding table and a side wall extending upward from the outer periphery of the bottom part, and includes a side wall temperature adjusting unit for adjusting the temperature of the side wall.
- the side wall temperature adjusting unit is provided inside the side wall.
- the plasma processing method is a plasma processing method for plasma processing a substrate to be processed.
- the plasma processing method includes a step of holding a substrate to be processed on a holding table provided in a processing container, a step of generating a microwave for plasma excitation, and a microwave processing using a dielectric plate.
- the step of introducing into the container and the reactive gas is supplied from the central portion of the dielectric plate toward the central region of the substrate to be processed, and toward the center of the substrate to be processed held on the holding table. Supplying a reaction gas.
- a plasma processing apparatus in still another aspect of the present invention, includes a holding table for holding a substrate to be processed thereon, a bottom portion located on the lower side of the holding table, and an annular side wall extending upward from the outer periphery of the bottom portion.
- the reaction gas supply unit includes a first reaction gas supply unit that supplies a reaction gas in a direction directly downward toward a central region of the substrate to be processed held on the holding table, and a substrate to be processed held on the holding table.
- the annular portion is provided on the outer diameter side of the holding table.
- a first temperature adjusting unit that adjusts the temperature of the central region of the substrate to be processed held by the holding table, and an end portion that is positioned around the central portion of the substrate to be processed held by the holding table.
- a second temperature adjusting unit that adjusts the temperature of the region.
- each of the first and second temperature adjusting units is provided inside the holding table.
- At least one of the first and second temperature adjustment units is composed of a plurality of members.
- the first reaction gas supply unit that supplies the reaction gas in the downward direction toward the central region of the substrate to be processed, and the reaction gas in the oblique direction toward the substrate to be processed.
- the second reaction gas supply unit that supplies the reaction gas, the reaction gas can be uniformly supplied to the entire substrate to be processed.
- the reaction gases supplied from the first and second reaction gas supply units are not allowed to stagnate on the substrate to be processed, and deposition (reaction product) retention can be suppressed.
- the flow of plasma reaching the substrate to be processed is not blocked by the second reactive gas supply unit. Therefore, in-plane uniformity in processing of the substrate to be processed can be improved.
- FIG. 1 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 cyclic
- the film thickness of the substrate W to be processed and the position on the substrate W to be processed when the angle ⁇ at which the reaction gas is supplied from the second reaction gas supply unit is 42 °. It is a graph which shows the relationship. In the plasma processing apparatus according to one embodiment of the present invention, the film thickness of the substrate W to be processed and the position on the substrate W to be processed when the angle ⁇ at which the reaction gas is supplied from the second reaction gas supply unit is 24 °. It is a graph which shows the relationship. It is a figure which shows the X-axis, Y-axis, V-axis, and W-axis which are shown in FIG. 5 and FIG.
- FIG. 10 shows the relationship between the lot number of the to-be-processed substrate processed in the plasma processing apparatus shown in FIG. 10 and the plasma processing apparatus shown in FIG. 21, and an etching rate standard value. It is a graph which shows the relationship between the lot number of the to-be-processed substrate processed in the plasma processing apparatus shown in FIG. 10, and the number of particles. It is a graph which shows the relationship between the center / edge flow rate
- FIG. 1 is a schematic sectional view showing a main part of a plasma processing apparatus according to an embodiment of the present invention.
- a plasma processing apparatus 11 includes a processing container 12 that performs plasma processing on a substrate W to be processed therein, and a reactive gas supply unit 13 that supplies a reactive gas for plasma processing into the processing container 12. Further, a disk-shaped holding table 14 that holds the substrate W to be processed, a microwave generator 15 that generates microwaves for plasma excitation, and a position that faces the holding table 14, generate microwaves.
- a dielectric plate 16 for introducing the microwave generated by the vessel 15 into the processing container 12 and a control unit (not shown) for controlling the entire plasma processing apparatus 11 are provided.
- the control unit controls process conditions for plasma processing the substrate W to be processed, such as a gas flow rate in the reaction gas supply unit 13 and a pressure in the processing container 12.
- the processing container 12 includes a bottom portion 17 located on the lower side of the holding table 14 and a side wall 18 extending upward from the outer periphery of the bottom portion 17.
- the side wall 18 is cylindrical.
- An exhaust hole 19 for exhaust is provided in the bottom 17 of the processing container 12.
- the upper side of the processing vessel 12 is open, and is provided by a dielectric plate 16 disposed on the upper side of the processing vessel 12 and an O-ring 20 as a seal member interposed between the dielectric plate 16 and the processing vessel 12.
- the processing container 12 is configured to be sealable.
- the microwave generator 15 having the matching 21 is connected to the upper part of the coaxial waveguide 24 for introducing the microwave through the mode converter 22 and the waveguide 23.
- the TE mode microwave generated by the microwave generator 15 passes through the waveguide 23, is converted to the TEM mode by the mode converter 22, and propagates through the coaxial waveguide 24.
- the coaxial waveguide 24 includes a central conductor 25 provided at the center in the radial direction and an outer peripheral conductor 26 provided at the outer side in the radial direction of the central conductor 25.
- the upper end of the center conductor 25 is connected to the ceiling partition wall of the mode converter 22.
- As the frequency of the microwave generated by the microwave generator 15, for example, 2.45 GHz is selected.
- As the waveguide 23, a waveguide having a circular cross section or a rectangular cross section is used.
- the dielectric plate 16 has a disc shape and is made of a dielectric. On the lower side of the dielectric plate 16, there is provided an annular recess 27 that is recessed in a taper shape for facilitating generation of a standing wave by the introduced microwave. Due to the recesses 27, microwave plasma can be efficiently generated on the lower side of the dielectric plate 16.
- Specific examples of the material of the dielectric plate 16 include quartz and alumina.
- the plasma processing apparatus 11 has a thin plate shape that introduces microwaves to the dielectric plate 16 through a slow wave plate 28 that propagates microwaves introduced by the coaxial waveguide 24 and a plurality of slot holes 29. Slot plate 30. Microwaves generated by the microwave generator 15 are propagated through the coaxial waveguide 24 to the slow wave plate 28 and introduced into the dielectric plate 16 from a plurality of slot holes 29 provided in the slot plate 30. The The microwave transmitted through the dielectric plate 16 generates an electric field directly below the dielectric plate 16 and generates plasma in the processing container 12.
- the holding table 14 also serves as a high-frequency electrode, and is supported by an insulating cylindrical support 31 that extends vertically upward from the bottom 17.
- An annular exhaust passage 33 is formed between the conductive cylindrical support portion 32 extending vertically upward from the bottom portion 17 of the processing container 12 along the outer periphery of the cylindrical support portion 31 and the side wall 18 of the processing container 12.
- the An annular baffle plate 34 provided with a plurality of through holes is attached to the upper portion of the exhaust passage 33.
- An exhaust device 36 is connected to the lower portion of the exhaust hole 19 through an exhaust pipe 35.
- the exhaust device 36 has a vacuum pump such as a turbo molecular pump. The exhaust device 36 can reduce the pressure inside the processing container 12 to a desired degree of vacuum.
- a high frequency power source 37 for RF bias is electrically connected to the holding table 14 via a matching unit 38 and a power feed rod 39.
- the high-frequency power source 37 outputs a constant frequency suitable for controlling the energy of ions drawn into the substrate W to be processed, for example, a high frequency of 13.56 MHz with a predetermined power.
- the matching unit 38 accommodates a matching unit for matching between the impedance on the high-frequency power source 37 side and the impedance on the load side such as an electrode, plasma, and the processing container 12, and the matching unit is included in this matching unit.
- a blocking capacitor for self-bias generation is included.
- An electrostatic chuck 41 for holding the substrate W to be processed with electrostatic attraction is provided on the upper surface of the holding table 14.
- a focus ring 42 that surrounds the periphery of the substrate W to be processed is provided on the outer side in the radial direction of the electrostatic chuck 41.
- the electrostatic chuck 41 is obtained by sandwiching an electrode 43 made of a conductive film between a pair of insulating films 44 and 45.
- a high-voltage DC power supply 46 is electrically connected to the electrode 43 via a switch 47 and a covered wire 48.
- the substrate W to be processed can be attracted and held on the electrostatic chuck 41 by a Coulomb force by a DC voltage applied from the DC power supply 46.
- An annular refrigerant chamber 51 extending in the circumferential direction is provided inside the holding table 14.
- a refrigerant having a predetermined temperature for example, cooling water
- the processing temperature of the substrate to be processed W on the electrostatic chuck 41 can be controlled by the temperature of the refrigerant.
- a heat transfer gas for example, He gas
- a heat transfer gas supply unit (not shown) is supplied between the upper surface of the electrostatic chuck 41 and the back surface of the substrate W to be processed via the gas supply pipe 54. .
- the reactive gas supply unit 13 supplies a reactive gas in a diagonal direction toward the substrate W to be processed, and a first reactive gas supply unit 61 that supplies the reactive gas in a direction directly downward toward the central region of the substrate W to be processed.
- a second reactive gas supply unit 62 Specifically, the first reactant gas supply unit 61, the reaction gas is supplied in the direction of the arrow F 1 in FIG. 1, the second reaction gas supply portion 62, an arrow F 2 in FIG. 1 The reaction gas is supplied in the direction of.
- the second reaction gas supply unit 62 supplies the reaction gas in an oblique direction toward the center side of the substrate to be processed W, here, the central region of the substrate to be processed W.
- the first reaction gas supply unit 61 and the second reaction gas supply unit 62 are supplied with the same type of reaction gas from the same reaction gas supply source (not shown).
- the first reactive gas supply unit 61 is at the center in the radial direction of the dielectric plate 16 and on the inner side of the dielectric plate 16 from the lower surface 63 of the dielectric plate 16 that is the facing surface facing the holding table 14. It is provided in the retracted position.
- the dielectric plate 16 is provided with an accommodating portion 64 that accommodates the first reactive gas supply portion 61.
- An O-ring 65 is interposed between the first reaction gas supply unit 61 and the storage unit 64 to ensure the sealing performance in the processing container 12.
- the first reaction gas supply unit 61 is provided with a plurality of supply holes 66 for supplying the reaction gas in a direction directly below so as to spray the reaction gas onto the central region of the substrate W to be processed.
- the supply hole 66 is provided in a region of the wall surface 67 facing the holding table 14 that is exposed in the processing container 12.
- the wall surface 67 is flat.
- the first reactive gas supply unit 61 is provided with a supply hole 66 positioned at the radial center of the dielectric plate 16.
- the plasma processing apparatus 11 is provided with a gas flow path 68 formed so as to penetrate the central conductor 25, the slot plate 30 and the dielectric plate 16 of the coaxial waveguide 24 and reach the supply hole 66, respectively.
- a gas supply system 72 is connected to a gas inlet 69 formed at the upper end portion of the center conductor 25.
- the gas supply system 72 includes an on-off valve 70 and a flow rate controller 71 such as a mass flow controller. The reaction gas is supplied while adjusting the flow rate and the like by the gas supply system 72.
- FIG. 2 is a view of the vicinity of the annular portion 73 included in the second reactive gas supply unit 62 shown in FIG. 1 as seen from the direction of the arrow II in FIG.
- the second reactive gas supply unit 62 includes an annular annular portion 73 and a suspension portion 74 that suspends the annular portion 73 from the side wall 18.
- the annular portion 73 is formed of a tubular member, and the inside thereof serves as a reaction gas flow path.
- the annular portion 73 is disposed between the holding table 14 and the dielectric plate 16 in the processing container 12.
- FIG. 3 is an enlarged view of the annular portion 73 indicated by III in FIG.
- the annular portion 73 extends straight in the up-down direction and has a wall portion 79a located on the inner diameter side, a wall portion 79b straight in the up-down direction, located on the outer diameter side, A wall portion 79c that extends straight in the direction and is located on the holding base 14 side, and a wall portion 79d that extends straight in an oblique direction so as to connect the lower end portion of the wall portion 79a and the inner diameter side end portion of the wall portion 79c. It is configured.
- the annular portion 73 is provided with a plurality of supply holes 75 that supply the reaction gas in an oblique direction so as to spray the reaction gas toward the substrate W to be processed.
- the supply hole 75 has a round hole shape.
- the supply hole 75 is provided in a wall portion 79d extending in an oblique direction. Specifically, the wall portion 79d is provided so as to open a part of the wall portion 79d in a direction perpendicular to the wall portion 79d.
- the angle of the supply hole 75 is arbitrarily determined according to the direction in which the reaction gas is supplied.
- the angle of the supply hole 75 is an angle in an oblique direction in which the reaction gas is supplied by the second reaction gas supply unit 62 and passes through the center 78 in the vertical direction of the annular portion 73 and extends in the left-right direction (see FIG. And an angle ⁇ between a straight line 79e extending in a direction perpendicular to the wall 79d and indicated by a three-dot chain line in FIG.
- the plurality of supply holes 75 are equally provided in the circumferential direction in the annular portion 73. In this embodiment, eight supply holes 75 are provided.
- the hanging part 74 is also composed of a tubular member.
- the reaction gas supplied from outside the processing container 12 is supplied to the annular portion 73 through the inside of the hanging portion 74.
- the suspension part 74 has a substantially L-shaped cross section, and has a shape that protrudes inward from the upper part of the side wall 18 and further extends downward in the vertical direction.
- An end portion 76 extending downward is connected to the annular portion 73.
- a gas supply system (not shown) in which the above-described on-off valve and flow rate controller are interposed is also provided on the outer side of the hanging portion 74.
- the second reaction gas supply unit 62 is provided at a position avoiding the region directly above the substrate W to be processed held on the holding table 14 and in the region directly above the holding table 14. Specifically, when the inner diameter of the annular annular portion 73 is D 1 and the outer diameter of the substrate to be processed W is D 2 , the inner diameter D 1 of the annular portion 73 is larger than the outer diameter D 2 of the substrate to be processed W. Is also made up of large. Further, the suspending portion 74 is also provided at a position avoiding the region directly above the substrate to be processed W.
- the second reaction gas supply unit 62 is preferably provided in the vicinity of the holding table 14. Specifically, an annular portion 73 is provided in a region having a low plasma density called a downflow region that is not affected by the flow of the reaction gas supplied from the first reaction gas supply unit 61 in the processing container 12. It is good to be.
- the substrate W to be processed is held on the holding table 14 provided in the processing container 12 by using the electrostatic chuck 41 described above.
- a microwave for plasma excitation is generated by the microwave generator 15.
- microwaves are introduced into the processing container 12 through the dielectric plate 16 and the like.
- the reaction gas is supplied from the supply hole 66 provided in the first reaction gas supply unit 61 toward the center region of the substrate W to be processed from the center part of the dielectric plate 16, and the second reaction is performed.
- the reaction gas is supplied in an oblique direction from the supply hole 75 provided in the annular portion 73 of the gas supply unit 62 toward the central region of the substrate W to be processed. In this way, plasma processing is performed on the substrate W to be processed.
- the first reaction gas supply unit 61 that supplies a reaction gas in a direction directly downward toward the central region of the substrate W to be processed, and the center of the substrate W to be processed.
- the reaction gas can be uniformly supplied to the entire substrate W to be processed by the second reaction gas supply unit 62 that supplies the reaction gas in an oblique direction toward the region. Further, the reaction gases supplied by the first and second reaction gas supply units 61 and 62 are not swollen together on the substrate W to be processed, and deposition retention can be suppressed. Further, the flow of plasma reaching the substrate W to be processed is not blocked by the second reaction gas supply unit 62. Therefore, in-plane uniformity in processing of the substrate W to be processed can be improved.
- FIG. 4 is a schematic diagram showing the flow of the reaction gas supplied from the first reaction gas supply unit 61 and the reaction gas supplied from the second reaction gas supply unit 62.
- each part constituting the plasma processing apparatus 11 is illustrated in a simplified manner.
- the reaction gas supplied from the first reaction gas supply unit 61 is supplied in the direction indicated by the arrow F 1 toward the central region of the substrate W to be processed, 4, once bounces and flows upward at a position 80 in the vicinity of the central region indicated by the dotted line in FIG.
- reaction gas is supplied from the second reaction gas supply unit 62 in the direction indicated by the arrow F 2 , the rising of the reaction gas due to the bounce is suppressed. Then, the reaction gas supplied from the first reaction gas supply unit 61 flows to the end region of the substrate W to be processed in the direction indicated by the arrow F 3 . With such a mechanism, it is considered that the reaction gas stagnation as shown in FIG. 22 does not occur.
- 5 and 6 are graphs showing the relationship between the film thickness and the position on the substrate to be processed W when the substrate to be processed W is formed in the plasma processing apparatus 11 according to one embodiment of the present invention.
- the vertical axis represents the film thickness ( ⁇ )
- the horizontal axis represents the distance (mm) from the center O.
- 7 shows the X axis, the Y axis, the V axis, and the W axis shown in FIGS. 5 and 6 on the substrate W to be processed.
- 5 and 6 are graphs showing a case where the angle ⁇ at which the reaction gas is supplied from the second reaction gas supply unit 62 is changed.
- FIG. 5 shows the case where the angle ⁇ at which the reaction gas is supplied from the second reaction gas supply unit 62 is 42 °
- FIG. 6 shows the angle ⁇ at which the reaction gas is supplied from the second reaction gas supply unit 62. Is shown as 24 °. Further, the center diameter of the annular portion 73 in the case shown in FIGS. 5 and 6 is 400 mm, and the distance L1 shown in FIG. 1 is 90 mm.
- FIG. 6 shows the case of the plasma processing apparatus 11 having the configuration shown in FIG. 1, in which the second reactive gas supply unit 62 is inclined toward the central region of the substrate W to be processed held on the holding table 14. This corresponds to the angle when the reaction gas is supplied in the direction.
- the ratio between the gas supply amount from the first reaction gas supply unit 61 and the gas supply amount from the second reaction gas supply unit 62 is set to 32:68.
- the ratio between the gas supply amount from the first reaction gas supply unit 61 and the gas supply amount from the second reaction gas supply unit 62 is 27:73.
- the film thickness of the central region and the end region of the substrate to be processed is the central region. Is slightly thicker than the thickness of the region between the end region and the end region, and the graph is somewhat W-shaped, but is relatively flat and substantially uniform. That is, it is processed uniformly in the surface. Furthermore, as shown in FIG. 6, when the angle ⁇ for supplying the reaction gas from the second reaction gas supply unit 62 is 24 °, the film thickness is approximately the same at each position of the substrate W to be processed. is there. That is, it is further processed uniformly in the surface.
- the in-plane uniformity in the processing of the substrate W to be processed can be improved by supplying the reaction gas from the second reaction gas supply unit 62 in an oblique direction.
- the in-plane uniformity in processing of the substrate W to be processed cannot be improved by adjusting the ratio of the gas supply amount, for example. That is, in the configuration of the conventional plasma processing apparatus shown in FIG. 22 and the like, the degree of processing in the plane of the substrate W to be processed is hardly changed even if the ratio of the gas supply amount is changed.
- each member constituting the second reaction gas supply unit 62 is provided at a position avoiding the region directly above the substrate W to be processed. Fatigue due to plasma of each member constituting the gas supply unit 62 can be reduced. Therefore, the lifetime of the second reactive gas supply unit 62 can be extended.
- the second reaction gas supply unit that supplies the reaction gas obliquely toward the substrate W to be processed includes an annular part and a hanging part that suspends the annular part from the side wall.
- the present invention is not limited to this, and an annular portion and a support portion that extends from the side wall to the inner diameter side and supports the annular portion may be included.
- FIG. 8 is a schematic sectional view showing the main part of the plasma processing apparatus in this case, and corresponds to the section shown in FIG. In FIG. 8, members and the like having the same configurations as those in FIG.
- the annular portion 93 included in the second reaction gas supply unit 92 provided in the plasma processing apparatus 91 and supplying the reaction gas in an oblique direction toward the substrate W to be processed is provided in the processing vessel 12.
- the side wall 18 is supported by a support portion 94 that extends straight to the inner diameter side.
- the support part 94 is hollow.
- the reactive gas supplied from the outside of the plasma processing apparatus 91 passes through the inside of the support portion 94 and is supplied into the processing container 12 from a supply hole 95 provided in the annular portion 93. Even with such a configuration, the same effect as described above can be obtained.
- the second reaction gas supply unit that supplies the reaction gas in an oblique direction toward the substrate W to be processed includes an annular part and a hanging part that suspends the annular part from the side wall.
- the present invention is not limited thereto, and a second reaction gas supply unit that supplies a reaction gas in an oblique direction toward the substrate W to be processed may be embedded in the sidewall of the processing container.
- the side wall of the processing container may include a protruding portion that protrudes inward, and the second reactive gas supply unit may be embedded in the protruding portion.
- FIG. 9 is a schematic sectional view showing the main part of the plasma processing apparatus in this case, and corresponds to the section shown in FIG. In FIG. 9, the members having the same configuration as in FIG.
- the side wall 82 of the plasma processing apparatus 81 includes a protruding portion 83 that protrudes inward, in this case, specifically, on the inner diameter side.
- the protrusion 83 is annular.
- An annular portion 84 included in the second reaction gas supply portion that supplies the reaction gas in an oblique direction toward the substrate W to be processed is embedded in the protruding portion 83.
- the plurality of supply holes 85 provided in the annular portion 84 are provided so as to be exposed and opened on the side of the wall surface 86 extending in the oblique direction in the protruding portion 83.
- the protruding portion 83 is provided at a position avoiding the region directly above the target substrate W and directly above the holding table 14.
- the inner diameter of the protruding portion 83 that is, the distance D 3 between the radially inner wall surfaces 88 of the protruding portion 83 is configured to be larger than the outer diameter D 2 of the substrate W to be processed.
- the annular portion 84 is provided with a gas flow path 89 that communicates from the outside of the processing vessel 87 to the annular portion 84 in the side wall 82. Even with such a configuration, the same effect as described above can be obtained.
- the entire processing container 87 may have a constriction structure in which the inner diameter of the upper side wall 82 of the annular portion 84 is smaller than the inner diameter of the lower side wall 82 of the annular portion 84.
- the supply hole provided in the annular portion is provided so as to open in a round hole shape.
- the supply hole is not limited to this, and the supply hole extends in the circumferential direction or the radial direction. You may open in the shape of a long hole.
- eight supply holes are provided, but the number is not limited to this.
- the annular portion is composed of a plurality of wall portions that extend straight in the vertical direction, the horizontal direction, and the oblique direction. It is good also as a structure including a part, and the cross section shown in FIG. 3 WHEREIN:
- the wall part which comprises an annular part may be annular
- the second reaction gas supply unit includes the annular part.
- the present invention is not limited to this, and a configuration that does not include the annular part, for example, the lower side of the plurality of hanging parts.
- a supply hole may be provided at the end, and the reaction gas may be supplied from the supply hole in an oblique direction toward the substrate W to be processed.
- the second reaction gas supply unit supplies the reaction gas in an oblique direction toward the central region of the substrate W to be processed held on the holding table.
- the second reactive gas supply unit may be configured to supply the reactive gas in a lateral direction toward the center of the substrate W to be processed held on the holding table.
- the reaction gases supplied from the first and second reaction gas supply units are not swollen on the substrate W to be processed, and the retention of deposition can be suppressed.
- FIG. 10 is a schematic cross-sectional view showing the main part of the plasma processing apparatus in this case, and corresponds to FIG.
- FIG. 11 is a view of a part of the second reactive gas supply unit included in the plasma processing apparatus shown in FIG. 10 as viewed from the direction of arrow XI in FIG.
- FIG. 12 is an enlarged view of a portion indicated by XII in FIG.
- the cross section shown in FIG. 10 corresponds to the XX cross section shown in FIG.
- a plasma processing apparatus 201 supplies a reactive gas in a lateral direction toward the center side of the substrate W to be processed held on the holding table.
- a second reactive gas supply unit 202 is provided.
- the second reaction gas supply unit 202 includes an annular annular portion 208 and three projecting portions 211 a, 211 b, and 211 c that project straight from the outer diameter surface side to the outer diameter side of the annular portion 208.
- the three projecting portions 211a to 211c are provided approximately equally in the circumferential direction of the annular portion 208. Specifically, the three protrusions 211a to 211c are provided at intervals of about 120 °.
- the second reaction gas supply unit 202 has a flat plate-like first member 209a having a protrusion corresponding to the protrusions 211a to 211c, and a substantially U-shaped cross section corresponding to the protrusions 211a to 211c. It is formed by joining a ring-shaped second member 209b having a projection to perform.
- the cross section of the second reactive gas supply unit 202 shown in FIG. 12 is substantially rectangular. That is, the gas flow path 210 formed by joining the first member 209a and the second member 209b is a space having a substantially rectangular cross section.
- quartz is used as a material of the first and second members.
- the second reaction gas supply unit 202 is provided with 36 supply holes 215 for supplying reaction gas into the processing container 12.
- the supply hole 215 is provided so as to supply the reaction gas straight toward the inner diameter side of the annular portion 208.
- the second member 209b constituting the second gas supply unit 202 is provided so as to penetrate straight through a wall portion located on the inner diameter side in the radial direction.
- the supply hole 215 is provided substantially at the center in the vertical direction of the annular portion 208.
- the supply hole 215 has a round hole shape, for example, a size of ⁇ 0.5 mm.
- the supply hole 215 is opened by, for example, a laser.
- the 36 supply holes 215 are provided on the inner diameter surface 216 of the second gas supply unit 202 so as to be evenly distributed in the circumferential direction.
- the second reactive gas supply unit 202 is attached to the inside of the processing vessel 12 by three support portions 212a, 212b, and 212c provided on the side wall 18 of the processing vessel 12. Specifically, the inner diameter surfaces 214a, 214b, and 214c of the three support portions 212a to 212c provided so as to extend from the side wall 18 of the processing vessel 12 to the inner diameter side at intervals of 120 ° and the above-described second reaction gas supply portion.
- the three protrusions 211a to 211c provided on 202 are attached so as to be joined to the outer diameter surfaces 213a, 213b, and 213c.
- the annular portion 208 is provided in a so-called downflow region.
- the support 212a is hollow, and gas can be supplied from the outside of the processing vessel 12 into the gas flow path 210 provided in the second reaction gas supply unit 202 through the support 212a.
- the other two support portions 212b and 212c are solid, and are configured such that gas cannot flow in and out. That is, the second reaction gas supply unit 202 is supplied with gas into the gas flow path 210 from the outside of the processing container 12 through the support part 212a and the protrusion part 211a, and is supplied from the 36 supply holes 215 to the center. It is ejected toward the side and supplied into the processing container 12.
- the plasma processing apparatus 201 shown in FIG. 10 includes a temperature adjusting unit 203 that is provided inside the holding table 14 and adjusts the temperature of the substrate W to be processed held on the holding table 14.
- the temperature adjustment unit 203 includes a first temperature adjustment unit 204 that adjusts the temperature of the central region of the substrate W to be processed held on the holding table 14, and the central portion of the substrate W to be processed held on the holding table 14.
- a second temperature adjusting unit 205 that adjusts the temperature of the end region located in the periphery of the.
- the first and second temperature adjustment units 204 and 205 are heaters that are individually temperature-controlled, for example.
- the first temperature adjusting unit 204 is provided at the center in the radial direction of the holding table 14.
- the second temperature adjustment unit 205 is annular and is provided on the outer diameter side of the first temperature adjustment unit with a radial interval.
- the central portion and the end portion of the substrate W to be processed can be set to different temperatures.
- the temperatures of the central portion and the end portion of the substrate to be processed W are separately controlled, and in-plane uniformity when the substrate to be processed W is processed. Can be further improved.
- the first and second temperature adjustment units 204 and 205 are controlled separately, and the temperature can be adjusted by flowing a refrigerant as in the plasma processing apparatus 11 shown in FIG. Good.
- the temperature adjusting unit 206 inside the cylindrical side wall 18 constituting the processing container 12 and inside the lid 217 disposed on the upper side of the side wall 18, respectively. 207 is provided.
- the temperature adjusting units 206 and 207 the temperature of the side wall 18 and the lid 217 can be adjusted to stabilize the temperature in the processing container 12. Therefore, more uniform processing is possible.
- the configuration of the temperature adjustment units 206 and 207 a configuration in which a heater or a refrigerant is allowed to flow can be given.
- the annular part 208 constituting the second reaction gas supply part 202 is constituted by a member different from the side wall 18 and the lid part 217, and the inside of the processing container 12 by the three support parts 212a to 212c. Therefore, the distance from the temperature adjustment units 206 and 207 is large and the temperature is stable. Therefore, the influence of the temperature adjustment by the temperature adjustment units 206 and 207 can be reduced, and the gas supply amount by the supply hole 215 provided in the second reaction gas supply unit 202 can be stabilized.
- FIG. 13 is a graph showing an etching rate standard value when 40 lots are processed in the plasma processing apparatus shown in FIG. 10 and the conventional plasma processing apparatus shown in FIG.
- the horizontal axis indicates the lot number, and the vertical axis indicates the etching rate standard value.
- the etching rate standard value is an index indicating how much each etching rate has changed from the average, where the average value of all the etching samples is 1.
- circles and solid lines indicate the case of the plasma processing apparatus shown in FIG. 10, and square marks and dotted lines indicate the case of the conventional plasma processing apparatus shown in FIG.
- the standard value of the etching rate between lots has changed within a range not reaching 1.00 to 1.01.
- it has changed within the range of 0.98 to 1.02. That is, the variation in the etching rate standard value in the case of the plasma processing apparatus shown in FIG. 10 is less than 0.01, whereas the variation in the etching rate standard value in the case of the plasma processing apparatus shown in FIG. Greater than 04.
- the variation in the etching rate standard value between lots is greatly reduced.
- FIG. 14 is a graph showing the relationship between the lot number of the substrate to be processed and the number of particles processed in the plasma processing apparatus shown in FIG.
- the horizontal axis indicates the lot number, and the vertical axis indicates the number of particles (pieces).
- the lot number in FIG. 14 is the same as the lot number in FIG.
- the particles were counted with a particle monitor (SP1) (manufactured by KLA Tencor) with particles having a particle diameter of 130 nm or more as particles.
- SP1 particle monitor
- the number of particles in the plasma processing apparatus shown in FIG. 10 is at most 5 in each lot, and in most cases, it is less than 5 and may be 0. That is, it can be understood that the number of particles is very small.
- the plasma processing apparatus shown in FIG. 21 there is a dielectric plate in the vicinity of the supply hole, and the supply hole is exposed to strong plasma, which is caused by the formation of particles on the inner wall surface or the like constituting the supply hole. It is thought to be a thing.
- the annular portion is provided in the downflow region, and it is considered that the supply holes are not exposed to strong plasma and particles are not easily formed.
- FIG. 15 is a graph showing the relationship between the center / edge flow rate ratio during processing in the plasma processing apparatus shown in FIG.
- the horizontal axis represents the center / edge flow rate ratio (%), and the vertical axis represents the processing variation (%).
- the center / edge flow ratio on the horizontal axis refers to the ratio of the gas supply amount from the center, that is, the gas supply amount from the first reaction gas supply unit, that is, the gas supply amount from the second reaction gas supply unit. Specifically, 0% indicates gas supply only from the first reaction gas supply unit, and 70% indicates gas supply from the first reaction gas supply unit out of the total gas supply amount. The amount is 70%, and the gas supply amount from the second reaction gas supply unit is 30%.
- the process variation indicates a difference between the maximum value and the minimum value of the in-plane etching divided by the in-plane multipoint average value.
- the variation in the case of the center first distribution, the variation is positive, and in the case of the edge first, the variation is expressed as a negative variation.
- Figure 16 provides the plasma processing apparatus shown in FIG. 10, the film thickness and the target substrate W of the target substrate W in the case of processing a target substrate at the center / edge flow ratio of 0% shown by the arrow G 1 in FIG. 15 It is a graph which shows the relationship with the position in.
- Figure 17 provides the plasma processing apparatus shown in FIG. 10, the film thickness and the target substrate W of the target substrate W in the case of processing a target substrate at the center / edge flow rate ratio of 70% indicated by arrow G 2 in FIG. 15 It is a graph which shows the relationship with the position in.
- Figure 18 provides the plasma processing apparatus shown in FIG.
- the variation in processing is about ⁇ 33%, which is a so-called center first distribution. That is, as shown in FIG. 16, the center of the substrate to be processed W is largely etched to reduce the film thickness at the center, the etching amount on the edge side of the substrate to be processed is reduced, and the film thickness at the edge is increased. Become. As the value of the center / edge flow rate ratio increases, the variation in processing approaches 0%, and when the center / edge flow ratio becomes 70%, a so-called edge first distribution is obtained. That is, as shown in FIG. 17, the process variation is about + 15%, and the end portion side of the substrate to be processed is etched more than the center of the substrate to be processed.
- the edge first distribution can be continuously controlled from the center first distribution.
- it is easy to change the center / edge flow ratio that is, to adjust the gas supply amount by the first and second reaction gas supply units to bring the process variation close to 0%. It is.
- the graph shown in FIG. 15 when the center / edge flow rate ratio is about 20%, it is possible to realize the variation in the shape processing as shown in FIG.
- the graph has a shape substantially parallel to the horizontal axis at a position away from the processing variation of 0%, and even if the center / edge flow ratio is changed, the processing variation of 0%. It becomes very difficult to realize.
- the supply hole was made into the round hole shape, not only this but a long hole shape, an ellipse shape, and polygonal shape may be sufficient.
- the position in the vertical direction in which the supply hole is provided is not limited to substantially the center, and may be on the lower side or the upper side in the vertical direction.
- the size of the opening area of the supply hole is also arbitrary.
- the number of supply holes is not limited to the above number, and for example, 8 or 16 is selected.
- the cross section of the annular portion may be annular or polygonal.
- the second reaction gas supply unit is configured by the first member and the second member, and the annular portion is supported by the three support units.
- the second reactive gas supply unit ejected in the lateral direction may be configured to be embedded in the side wall of the processing vessel as in the plasma processing apparatus shown in FIG. 9 described above.
- FIG. 19 is a schematic cross-sectional view showing the main part of the plasma processing apparatus in this case, and corresponds to FIG. In FIG. 19, the members having the same configuration as in FIG.
- a plasma processing apparatus 221 supplies a reactive gas in a lateral direction toward the center side of the substrate W to be processed held on the holding table 14.
- a second reaction gas supply unit 222 is provided.
- the temperature adjustment unit 223 provided inside the holding table 14 includes a first temperature adjustment unit 224 located at the radial center of the holding table 14 and an annular second position located on the outer diameter side of the first temperature adjustment unit 224. Temperature adjustment unit 225.
- the projecting portion 229 is configured to be continuous in an annular shape.
- a gas supply hole 231 that opens in the lateral direction is provided in the inner diameter surface 228 of the protrusion 229.
- a gas flow path 230 is formed in the side wall 82 so as to reach the supply hole 231 from the outside of the processing container 12.
- the supply holes 231 are opened in a round hole shape, and a plurality of supply holes 231 are provided substantially equally in the circumferential direction. Further, similarly to the plasma processing apparatus shown in FIG.
- temperature adjusting units 226 and 227 are provided inside the lower side of the side wall 82 and inside the upper side of the side wall 82 with the gas flow path 230 interposed therebetween. ing. Even with such a configuration, the same effects as described above can be obtained.
- the second reaction gas supply unit provided in the plasma processing apparatus is provided at a position avoiding the region directly above the substrate to be processed and directly above the holding table.
- the present invention is not limited to this, and the plasma processing apparatus may have the following configuration.
- a plasma processing apparatus includes a holding base for holding a substrate to be processed thereon, a bottom portion located on the lower side of the holding base, and an annular side wall extending upward from the outer periphery of the bottom portion.
- a processing container for performing plasma processing on the substrate to be processed therein, plasma generating means for generating plasma in the processing container, and a reactive gas supply unit for supplying a reactive gas for plasma processing into the processing container are provided.
- the reactive gas supply unit includes a first reactive gas supply unit that supplies a reactive gas in a direction directly downward toward a central region of the substrate to be processed held on the holding table, and a target gas held on the holding table.
- FIG. 20 shows the plasma processing apparatus 241 having such a configuration.
- the configuration of the plasma processing apparatus 241 shown in FIG. 20 is a position where the annular portion constituting the second reactive gas supply unit 242 avoids the region directly above the target substrate W held on the holding table 14. 10 is the same as the configuration of the plasma processing apparatus shown in FIG.
- the annular portion is provided on the outer diameter side by the outer diameter surface of the holding table 14. That is, the annular portion may be provided on the outer diameter side of the region directly above the holding table 14.
- the first and second temperature adjustment units are provided inside the holding table.
- the present invention is not limited to this, and the outside of the holding table is not limited thereto. May be provided.
- the 1st and 2nd temperature control part may be divided
- the first and second temperature adjustment units may be integrated. That is, for example, an integrated heater having a configuration in which the temperature of the center portion and the end portion can be separately adjusted may be used.
- each temperature adjusting unit may be provided as necessary.
- the wall surface facing the holding table in the first reactive gas supply unit is flat.
- the present invention is not limited to this, and the portion provided with the supply hole protrudes toward the holding table. It is good also as composition to do.
- reaction gases supplied from the first and second reaction gas supply units are the same type.
- the present invention is not limited to this, and the reaction gas is supplied from the first reaction gas supply unit.
- the type of reaction gas to be supplied may be different from the type of reaction gas supplied from the second reaction gas supply unit.
- the configuration of the apparatus specifically, the direction of the apparatus is substantially directly below due to the size configuration of the apparatus due to the size of the processing container, the position of the holding base, the size of the substrate to be processed, etc. It does not matter if the gas is supplied to the tank. That is, the angle ⁇ is set to be around 90 °. Even if it becomes such a structure, there can exist an effect similar to the above.
- the plasma processing apparatus uses a microwave as a plasma source.
- the present invention is not limited to this, and ICP (Inductively-coupled Plasma), ECR (Electron Cyclotron Resonance) plasma, parallel plate type plasma, and the like.
- the present invention is also applied to a plasma processing apparatus using a plasma source as a plasma source.
- the plasma processing apparatus and the plasma processing method according to the present invention are effectively used when it is required to improve the in-plane uniformity of the substrate to be processed.
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Abstract
Description
Claims (20)
- その内部で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、
前記処理容器内にプラズマ処理用の反応ガスを供給する反応ガス供給部とを備えるプラズマ処理装置であって、
前記反応ガス供給部は、前記保持台上に保持された前記被処理基板の中央領域に向かって真下方向に反応ガスを供給する第一の反応ガス供給部と、
前記保持台上に保持された前記被処理基板の真上領域を避けた位置であってかつ前記保持台の真上領域に設けられており、前記保持台上に保持された前記被処理基板の中心側に向かって反応ガスを供給する第二の反応ガス供給部とを含む、プラズマ処理装置。 - 前記第二の反応ガス供給部は、前記保持台の近傍に配置されている、請求項1に記載のプラズマ処理装置。
- 前記第二の反応ガス供給部は、前記保持台上に保持された前記被処理基板の中央領域に向かって斜め方向に反応ガスを供給する、請求項1に記載のプラズマ処理装置。
- 前記第二の反応ガス供給部は、前記保持台上に保持された前記被処理基板の中心側に向かって真横方向に反応ガスを供給する、請求項1に記載のプラズマ処理装置。
- 前記第二の反応ガス供給部は、環状部を含み、
前記環状部には、反応ガスを供給する供給孔が設けられている、請求項1に記載のプラズマ処理装置。 - 前記被処理基板は、円板状であり、
前記環状部は、円環状であって、
前記環状部の内径は、前記被処理基板の外径よりも大きい、請求項5に記載のプラズマ処理装置。 - 前記処理容器は、前記保持台の下方側に位置する底部と、前記底部の外周から上方向に延びる側壁とを含み、
前記第二の反応ガス供給部は、前記側壁内に埋設されている、請求項1に記載のプラズマ処理装置。 - 前記側壁は、内方側に突出する突出部を含み、
前記第二の反応ガス供給部は、前記突出部内に埋設されている、請求項7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板とを含み、
前記第一の反応ガス供給部は、前記誘電体板の中央部に設けられている、請求項1に記載のプラズマ処理装置。 - 前記保持台に保持された前記被処理基板の中央部の領域の温度を調整する第一の温度調整部と、前記保持台に保持された前記被処理基板の中央部の周辺に位置する端部の領域の温度を調整する第二の温度調整部とを備える、請求項1に記載のプラズマ処理装置。
- 前記第一および第二の温度調整部はそれぞれ、前記保持台の内部に設けられている、請求項10に記載のプラズマ処理装置。
- 前記第一および第二の温度調整部の少なくともいずれか一方は、複数の部材に分割されている、請求項10に記載のプラズマ処理装置。
- 前記処理容器は、前記保持台の下方側に位置する底部と、前記底部の外周から上方向に延びる側壁とを含み、
前記側壁の温度を調整する側壁温度調整部を備える、請求項1に記載のプラズマ処理装置。 - 前記側壁温度調整部は、前記側壁の内部に設けられている、請求項12に記載のプラズマ処理装置。
- 被処理基板をプラズマ処理するためのプラズマ処理方法であって、
処理容器内に設けられた保持台上に被処理基板を保持させる工程と、
プラズマ励起用のマイクロ波を発生させる工程と、
誘電体板を用いてマイクロ波を前記処理容器内に導入する工程と、
前記誘電体板の中央部から前記被処理基板の中央領域に向かって真下方向に反応ガスを供給すると共に、前記保持台上に保持された前記被処理基板の真上領域を避けた位置であってかつ前記保持台の真上領域から前記被処理基板に向かって斜め方向に反応ガスを供給する工程とを含む、プラズマ処理方法。 - その上に被処理基板を保持する保持台と、
前記保持台の下方側に位置する底部および前記底部の外周から上方向に延びる環状の側壁とを含み、その内部で前記被処理基板にプラズマ処理を行う処理容器と、
前記処理容器内にプラズマを発生させるプラズマ発生手段と、
前記処理容器内にプラズマ処理用の反応ガスを供給する反応ガス供給部とを備えるプラズマ処理装置であって、
前記反応ガス供給部は、前記保持台上に保持された前記被処理基板の中央領域に向かって真下方向に反応ガスを供給する第一の反応ガス供給部と、
前記保持台上に保持された前記被処理基板の真上領域を避けた位置および前記側壁の内径側の位置であってかつ前記保持台よりも上方に設けられた環状部を含み、前記保持台上に保持された被処理基板の中心側に向かって反応ガスを供給する第二の反応ガス供給部とを含む、プラズマ処理装置。 - 前記環状部は、前記保持台の外径側に設けられている、請求項16に記載のプラズマ処理装置。
- 前記保持台に保持された前記被処理基板の中央部の領域の温度を調整する第一の温度調整部と、前記保持台に保持された前記被処理基板の中央部の周辺に位置する端部の領域の温度を調整する第二の温度調整部とを備える、請求項16に記載のプラズマ処理装置。
- 前記第一および第二の温度調整部はそれぞれ、前記保持台の内部に設けられている、請求項18に記載のプラズマ処理装置。
- 前記第一および第二の温度調整部の少なくともいずれか一方は、複数の部材に分割されている、請求項18に記載のプラズマ処理装置。
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