WO2012046418A1 - 基板のプラズマ処理方法 - Google Patents
基板のプラズマ処理方法 Download PDFInfo
- Publication number
- WO2012046418A1 WO2012046418A1 PCT/JP2011/005501 JP2011005501W WO2012046418A1 WO 2012046418 A1 WO2012046418 A1 WO 2012046418A1 JP 2011005501 W JP2011005501 W JP 2011005501W WO 2012046418 A1 WO2012046418 A1 WO 2012046418A1
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- WIPO (PCT)
- Prior art keywords
- substrate
- plasma processing
- tray
- processing step
- chamber
- Prior art date
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- 239000000758 substrate Substances 0.000 title claims abstract description 389
- 238000000034 method Methods 0.000 title claims abstract description 108
- 238000009832 plasma treatment Methods 0.000 title claims abstract description 16
- 239000006227 byproduct Substances 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims description 105
- 230000008569 process Effects 0.000 claims description 94
- 239000007789 gas Substances 0.000 claims description 38
- 239000000112 cooling gas Substances 0.000 claims description 28
- 230000004308 accommodation Effects 0.000 claims description 22
- 238000003672 processing method Methods 0.000 claims description 22
- 229910052594 sapphire Inorganic materials 0.000 claims description 12
- 239000010980 sapphire Substances 0.000 claims description 12
- 238000003379 elimination reaction Methods 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 230000008030 elimination Effects 0.000 claims description 9
- 238000001179 sorption measurement Methods 0.000 claims description 9
- 238000006386 neutralization reaction Methods 0.000 claims 1
- 239000000047 product Substances 0.000 abstract description 4
- 238000005530 etching Methods 0.000 description 54
- 238000004140 cleaning Methods 0.000 description 37
- 229910052751 metal Inorganic materials 0.000 description 15
- 239000002184 metal Substances 0.000 description 15
- 238000001312 dry etching Methods 0.000 description 13
- 238000009616 inductively coupled plasma Methods 0.000 description 12
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
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- 239000002826 coolant Substances 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000007723 transport mechanism Effects 0.000 description 3
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
- B44C1/22—Removing surface-material, e.g. by engraving, by etching
- B44C1/227—Removing surface-material, e.g. by engraving, by etching by etching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67063—Apparatus for fluid treatment for etching
- H01L21/67069—Apparatus for fluid treatment for etching for drying etching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68742—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a lifting arrangement, e.g. lift pins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68771—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by supporting more than one semiconductor substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/005—Processes
Definitions
- the present invention relates to a method for performing plasma processing on a plurality of substrates that are transported while being accommodated in a tray.
- an etching process (plasma process) is performed as a process of forming a concavo-convex structure on the surface of the sapphire substrate in order to improve the external extraction efficiency of light from the device.
- a plurality of substrates are handled in a state of being accommodated in a tray (see, for example, Patent Document 1).
- a plurality of substrate accommodation holes are formed in the tray, and the edges of the sapphire substrate are supported by the substrate support portion protruding from the inner wall of the substrate accommodation hole, so that the plurality of substrates are placed in the tray. It is configured to be accommodated.
- a substrate stage is disposed in the chamber of the plasma processing apparatus, and a tray support part and a plurality of substrate holding parts protruding upward from the tray support part are provided on the upper surface of the substrate stage.
- the plurality of substrates are loaded into the chamber while being accommodated in the tray, and the plurality of substrates are placed on the substrate holding unit by placing the tray on the tray support unit. At the same time, the edge of the substrate is separated from the substrate support.
- each substrate is electrostatically attracted by an ESC (electrostatic chuck) built in the substrate holding unit, and the substrate is etched by the substrate holding unit.
- the adsorption holding by the ESC is released, the tray is lifted from the tray support portion, and a plurality of substrates are carried out of the chamber in a state where the edge portion of the substrate is again supported by the substrate support portion.
- the edge of the substrate held by each substrate holding part in the substrate stage and the substrate support part in the tray are in a state of being separated from each other.
- By-products (depots) generated from the sapphire substrate and the tray (for example, formed of SiC) during the processing adhere to the edge of the substrate and the inner wall of the substrate accommodation hole of the tray.
- the substrate holding part of the tray and the edge of the substrate come into contact with each other, and the attached by-product is removed from the substrate holding part. May fall on top.
- an object of the present invention is to solve the above problems, and in a method for performing plasma processing on a plurality of substrates that are transported in a state of being accommodated in a tray, an edge portion of the substrate during plasma processing is provided. It is another object of the present invention to provide a plasma processing method for a substrate which can improve the quality of a product by removing a by-product attached to a tray.
- the present invention is configured as follows.
- a plurality of substrate accommodation holes for accommodating a substrate are provided, and a tray having a substrate support portion protruding from the inner wall of the substrate accommodation hole is used.
- a tray is placed on the tray support portion and a substrate is placed on each substrate holding portion.
- a substrate placing step in which the edge of the substrate protruding from the edge of the substrate holding portion and the substrate support portion are separated from each other,
- a first plasma processing step of supplying a processing gas into the chamber and adjusting a pressure in the chamber to perform plasma processing on each substrate; In a state where the tray and each substrate are placed on the substrate stage, the processing gas is supplied into the chamber and the pressure in the chamber is adjusted to perform the plasma processing, and the substrate is obtained by performing the first plasma processing step.
- a second plasma treatment step of removing by-products attached to the edge of the substrate and the substrate support A substrate plasma processing method comprising: a substrate unloading step of unloading each substrate from the chamber together with a tray in a state where the edge of the substrate is supported by the substrate support after the second plasma processing step is completed. To do.
- the processing gas is switched to a different type of processing gas from the processing gas in the first plasma processing step.
- each substrate in the first plasma processing step, is attracted and held on the substrate holding portion by electrostatic attraction, and cooling supplied at a predetermined pressure between the substrate and the substrate holding portion.
- Plasma treatment while cooling with gas In the second mode, after the first plasma processing step, when performing the second plasma processing step, electrostatic adsorption is performed by switching to a driving voltage lower than the electrostatic adsorption driving voltage in the first plasma processing step.
- a substrate plasma processing method as described is provided.
- the substrate plasma processing method according to the third aspect is switched to a pressure lower than the pressure of the cooling gas in the first plasma processing step.
- the differential pressure between the electrostatic adsorption driving voltage and the pressure inside the chamber in the second plasma processing step and the cooling gas in performing the second plasma processing step is zero.
- the substrate plasma processing method according to the fourth aspect is provided.
- a sapphire substrate is used as the substrate, and in the first plasma processing step, a process of forming a minute uneven structure on the surface of the sapphire substrate is performed as plasma processing.
- a method for plasma processing a substrate is provided.
- BCl 3 is used as a processing gas in the first plasma processing step
- the static elimination step is performed in which the static elimination plasma is generated to reduce the residual electrostatic attraction force between the substrate and the substrate holder.
- the plasma of the substrate according to any one of the first to eighth aspects wherein the removed by-product is accumulated on the side surface of the substrate holding part.
- a processing method is provided.
- the edge of the substrate protruding from the end of the substrate holding portion and the substrate support portion of the tray are separated,
- the first plasma processing step is performed, and then the substrate edge portion and the substrate support portion are formed by performing the first plasma processing step while the edge portion of the substrate and the substrate support portion of the tray are separated from each other.
- By-products adhering to each other can be removed by performing the second plasma treatment step. Therefore, after that, when the plurality of substrates are unloaded from the chamber while the edge of the substrate is again supported by the substrate support portion of the tray and accommodated in the tray, the by-product is caused by contact between the tray and the substrate. It can be prevented from falling. Therefore, the quality of the product in the substrate plasma processing method can be improved.
- FIG. 1 is a configuration diagram of a dry etching apparatus according to an embodiment of the present invention.
- Perspective view of tray, substrate and substrate stage Perspective view of tray, substrate and substrate stage (tray placement state)
- the flowchart which shows the procedure of the etching processing method of this embodiment
- Explanatory drawing which shows the adhesion state of a deposit
- the fragmentary sectional view which shows the vicinity of the side surface of the board
- Explanatory drawing which shows operation
- FIG. 1 shows a configuration diagram of an ICP (inductively coupled plasma) type dry etching apparatus 1 as an example of a plasma processing apparatus according to an embodiment of the present invention.
- the dry etching apparatus 1 includes a chamber (vacuum container) 3 that constitutes a processing chamber in which plasma processing is performed on the substrate 2.
- the upper end opening of the chamber 3 is closed in a sealed state by a top plate 4 formed of a dielectric such as quartz.
- the lower surface side of the top plate 4 is covered with a top plate cover portion 6 formed of a dielectric.
- An ICP coil 5 is disposed on the top plate 4, and the ICP coil 5 is covered with a coil cover portion 10.
- the ICP coil 5 is electrically connected to a first high frequency power supply unit 7 including a matching circuit.
- a substrate stage 9 having a function as a lower electrode to which a bias voltage is applied and a function as a holding table for the substrate 2 is disposed on the bottom side in the chamber 3 facing the top plate 4.
- the chamber 3 is provided with a gate valve 3a that can be opened and closed that communicates with, for example, a load dock chamber (not shown), and the substrate 2 is held and opened by a hand unit provided in a transfer mechanism (not shown).
- the loading / unloading operation of the substrate 2 is performed through the gate valve 3a in the state.
- a gas supply unit 12 is connected to an etching gas inlet 3 b provided in the chamber 3.
- the gas supply unit 12 is provided with a plurality of types of gas supply lines (for example, BCl 3 , Cl 2 , Ar, O 2 , CF 4 ), and an open / close valve provided for each gas type line.
- a processing gas having a desired flow rate and specifications can be supplied from the gas inlet 3b.
- a pressure control unit 13 including a vacuum pump and a pressure control valve is connected to the exhaust port 3 c provided in the chamber 3.
- the tray 15 includes a thin disc-shaped tray body 15a.
- the material of the tray 15 include ceramic materials such as alumina (Al 2 O 3 ), aluminum nitride (AlN), zirconia (ZrO), yttria (Y 2 O 3 ), silicon nitride (SiN), and silicon carbide (SiC).
- ceramic materials such as alumina (Al 2 O 3 ), aluminum nitride (AlN), zirconia (ZrO), yttria (Y 2 O 3 ), silicon nitride (SiN), and silicon carbide (SiC).
- metals such as aluminum coated with alumite, aluminum coated with ceramics on the surface, and aluminum coated with a resin material.
- the tray 15 formed using silicon carbide as a main material is used.
- the tray body 15a is provided with four substrate accommodation holes 19 penetrating in the thickness direction from the upper surface 15b to the lower surface 15c.
- the substrate accommodation holes 19 are arranged at equiangular intervals with respect to the center of the tray main body 15a when viewed from the upper surface 15b and the lower surface 15c.
- the inner wall 15d of each substrate housing hole 19 is provided with a substrate support portion 21 protruding toward the center of the hole.
- substrate support part 21 is provided in the perimeter of the inner wall 15d, and is annular
- Each substrate accommodation hole 19 accommodates one substrate 2.
- the lower surface portion of the outer peripheral edge 2 a of the substrate 2 accommodated in the substrate accommodating hole 19 is supported by the upper surface 21 a of the substrate support portion 21. Further, since the substrate accommodation hole 19 is formed so as to penetrate the tray main body 15a in the thickness direction, the lower surface of the substrate 2 is exposed by the substrate accommodation hole 19 when viewed from the lower surface side of the tray main body 15a. Yes.
- the tray body 15a is formed with a notch 15e in which the outer peripheral edge is partially cut out, and the orientation of the tray 15 can be easily confirmed by using a sensor or the like when the tray 15 is handled during transportation.
- the substrate stage 9 is formed of a stage upper part 23 formed of a dielectric member such as ceramics, and aluminum having alumite coating on the surface and functions as a lower electrode to which a bias voltage is applied.
- the stage upper part 23 arranged at the uppermost part of the substrate stage 9 is fixed to the upper surface of the metal block 24, and the outer periphery of the stage upper part 23 and the metal block 24 is covered with the insulator 25, and the outer periphery of the insulator 25 is further covered. Is covered with a shield 27 made of metal.
- the stage upper part 23 is formed in a disk shape, and the upper end surface of the stage upper part 23 is a tray support part 28 that supports the lower surface 15 c of the tray 15. Further, four short cylindrical substrate holding portions 29 corresponding to the respective substrate accommodation holes 19 of the tray 15 protrude upward from the tray support portion 28. Further, an annular guide ring 30 is disposed on the stage upper portion 23 so as to surround the tray support portion 28 and protrudes upward from the stage upper portion 23. The guide ring 30 plays a role of guiding the arrangement position of the tray 15 in the stage upper part 23.
- the outer diameter R1 of the substrate holding part 29 is set smaller than the inner diameter R2 of the front end face (inner peripheral end face) 21b of the substrate support part 21. Therefore, in a state where the tray 15 is disposed on the tray support portion 28, a gap is secured between the substrate support portion 21 formed in the substrate accommodation hole 19 and the substrate holding portion 29 so as not to contact each other.
- the height H1 from the lower surface 15c of the tray body 15a to the upper surface 21a of the substrate support portion 21 is set to be lower than the height H2 from the tray support portion 28 to the holding surface 31 of the substrate holding portion 29. Therefore, in a state where the lower surface 15c of the tray 15 is disposed on the tray support portion 28, the substrate 2 is pushed up by the holding surface 31 of the substrate holding portion 29, and the substrate 2 is lifted from the substrate support portion 21 of the tray 15. Become.
- the tray 15 that accommodates the substrate 2 in the substrate accommodation hole 19 is arranged on the upper stage 23, the substrate 2 accommodated in the substrate accommodation hole 19 is lifted from the upper surface 21 a of the substrate support portion 21, and The lower surface of the substrate 2 is disposed on the holding surface 31 of the substrate holding portion 29 in a state where the edge portion 2 a and the upper surface 21 a of the substrate supporting portion 21 are separated from each other.
- the upper surface of the substrate 2 and the upper surface 15b of the tray 15 are It will be in the state located in the almost same height.
- the outer diameter R1 of the substrate holding part 29 is set smaller than the outer diameter R3 of the substrate 2. Therefore, when the substrate 2 is disposed on the substrate holding portion 29 and is separated from the tray 15, the edge portion 2 a of the substrate 2 has a diameter larger than the outer peripheral end portion of the substrate holding portion 29 as shown in FIG. It is in a state of protruding outward in the direction.
- an ESC electrode (electrostatic chucking electrode) 40 is built in the vicinity of the holding surface 31 of each substrate holding part 29 provided on the stage upper part 23. These ESC electrodes 40 are electrically insulated from each other, and a DC voltage for electrostatic adsorption is applied from an ESC drive power supply unit 41 having a built-in DC power supply.
- a cooling gas supply port 44 is provided on the holding surface 31 of each substrate holding unit 29, and each cooling gas supply port 44 is connected to a common cooling gas supply unit 47 through a cooling gas supply path 47. 45.
- helium He
- cooling of the substrate 2 is performed by supplying a cooling gas between the holding surface 31 of the substrate holding unit 29 and the substrate 2 during the plasma processing. Is done.
- the metal block 24 is electrically connected to a second high frequency power supply unit 56 that applies a high frequency as a bias voltage.
- the second high frequency power supply unit 56 includes a matching circuit.
- a coolant channel 60 for cooling the metal block 24 is formed in the metal block 24, and the coolant whose temperature is adjusted by the cooling unit 59 is supplied to the coolant channel 60, so that the metal block 24 is cooled.
- the substrate stage 9 includes a plurality of trays 15 that are arranged on the tray support portion 28 and are pushed up (push up) from the lower surface side to raise the respective substrates 2 together with the tray 15.
- a tray push-up rod 18 is provided. Each tray push-up rod 18 is driven up and down by the drive mechanism 17 between a push-up position protruding from the upper surface of the tray support portion 28 and a storage position stored in the tray support portion 28.
- control unit 70 provided in the dry etching apparatus 1
- the first high frequency power supply unit 7, the second high frequency power supply unit 56, the ESC drive power supply unit 41, the gate valve 3 a, the transport mechanism, and the drive which are the respective components included in the dry etching apparatus 1.
- Operations of the mechanism 17, the gas supply unit 12, the cooling unit 59, and the pressure control unit 13 are controlled by the control unit 70 while being associated with the operations of the other components.
- the control unit 70 is provided with an operation / input unit 71 for performing operations and inputs by an operator, and a display unit 72 for displaying operation information and the like in the dry etching apparatus 1.
- a sapphire substrate is handled as the substrate 2, and a process for forming a minute uneven structure on the surface of the sapphire substrate 2 (PSS: Patterned Sapphire Substrate) as an etching process (plasma process). ) Is performed.
- PSS Patterned Sapphire Substrate
- plasma process etching process
- etching processing first plasma processing step
- the control unit 70 includes these programs and a calculation unit that executes the programs, and a transfer processing unit 73, an etching processing unit 74, a cleaning processing unit 75, and a charge removal processing unit as processing units that execute various processes. 76 is provided. Further, the control unit 70 is provided with an operation condition storage unit 77 that stores various operation conditions for performing the etching process, the cleaning process, and the charge removal process.
- the tray carry-in process (step S1) in the flowchart of FIG. 6 is performed. Specifically, in the dry etching apparatus 1, the gate valve 3a is opened. Thereafter, the tray 15 in which the substrates 2 are accommodated in the four substrate accommodation holes 19 is held by the hand portion of the transport mechanism, and is carried into the chamber 3 from the load lock chamber through the gate valve 3a, for example. .
- the tray push-up rod 18 driven by the drive mechanism 17 rises, and the tray 15 is transferred from the hand portion to the upper end of the tray push-up rod 18. After the transfer of the tray 15, the hand unit is retracted to the load lock chamber, and the gate valve 3a is closed.
- the tray push-up rod 18 that supports the tray 15 at the upper end descends from the push-up position toward the storage position stored in the substrate stage 9.
- the lower surface 15 c of the tray 15 is lowered to the tray support portion 28 of the stage upper portion 23 of the substrate stage 9, and the tray 15 is supported by the tray support portion 28 of the stage upper portion 23.
- the substrate holding portion 29 of the stage upper portion 23 enters the corresponding substrate accommodation hole 19 of the tray 15 from the lower surface 15c side of the tray 15.
- the holding surface 31 that is the upper end surface of the substrate holding portion 29 contacts the lower surface of the substrate 2.
- each substrate 2 is positioned with high positioning accuracy with respect to the substrate holding portion 29.
- an etching process (step S2) is performed. Specifically, a gas for etching treatment is supplied from the gas supply unit 12 into the chamber 3, and the inside of the chamber 3 is adjusted to a predetermined pressure by the pressure control unit 13. Subsequently, a high frequency voltage is applied from the first high frequency power supply unit 7 to the ICP coil 5. As a result, plasma is generated in the chamber 3.
- a bias voltage is applied to the metal block 24 of the substrate stage 9 by the second high-frequency power supply unit 56 in a state where the cooling gas is sufficiently filled (maintained at a predetermined pressure), and is generated in the chamber 3. Plasma is drawn toward the substrate stage 9 side. Thereby, the etching process with respect to the board
- the cooling unit 59 circulates the refrigerant in the refrigerant flow path 60 to cool the metal block 24, thereby the substrate 2 held on the stage upper part 23 and the holding surface 31. Is cooled. Therefore, the temperature of the substrate 2 is reliably controlled in the etching process.
- a predetermined processing time elapses, the application of the bias voltage to the metal block 24 of the substrate stage 9 by the second high-frequency power supply unit 56 is stopped and the supply of the etching gas is stopped to perform the etching process on the substrate 2. Is completed.
- FIGS. 7A and 7B the state of the substrate 2 and the tray 15 immediately after such an etching process is shown in the explanatory diagrams of FIGS. 7A and 7B.
- FIG. 7A when the tray 15 is placed on the tray support portion 28 and the substrate 2 is held on the respective substrate holding portions 29, the upper surface 21a of the substrate support portion 21 of the tray 15 and the substrate A gap is provided between the lower surface of the two edge portions 2a so as not to contact each other.
- the etching process is performed in such a state, the lower surface of the edge 2a of the substrate 2 or the vicinity thereof (part A), the substrate support portion 21 of the tray 15 hidden by the edge 2a of the substrate 2 is covered.
- the edge 2a of the substrate 2 protrudes beyond the outer peripheral end of the substrate holding portion 29.
- the etching process is performed with the edge portion 2a of the substrate 2 and the substrate support portion 21 of the tray 15 being separated from each other. For this reason, during the etching process, a deposit 93 as a by-product of the etching process is formed on the lower surface of the edge 2a of the substrate 2 or the substrate support part 21 of the tray 15, which is a part where the generated plasma is relatively difficult to enter. It tends to adhere and remain.
- the process of removing the deposit 93 attached between the substrate 2 and the tray 15 in this way is the next cleaning process.
- the cleaning process is performed (step S3). Specifically, a cleaning gas of a different type from the etching gas is supplied from the gas supply unit 12 into the chamber 3, and the inside of the chamber 3 is adjusted to a predetermined pressure by the pressure control unit 13. Subsequently, a high frequency voltage is applied from the first high frequency power supply unit 7 to the ICP coil 5 to generate plasma in the chamber 3. At this time, the bias voltage from the second high frequency power supply unit 56 is not applied. This plasma removes the edge 2a of the substrate 2, the substrate supporting portion 21 of the tray 15, and the deposit attached to the vicinity thereof.
- the side surface 26 of the substrate holding portion 29 is located on the back side of the gap between the lower surface of the edge portion 2a of the substrate 2 and the substrate support portion 21 of the tray 15. Since this gap is provided as a gap that does not allow the lower surface of the edge 2a and the substrate support portion 21 to contact each other, the side surface 26 of the substrate holding portion 29 located on the far side of the gap is generated during the cleaning process. Difficult to be exposed to plasma. Therefore, most of the deposits removed by the cleaning process can adhere to the side surface 26 of the substrate holding portion 29 and be deposited. Furthermore, when the cleaning process is repeated, the deposits can be stacked and accumulated. That is, the depots removed by the cleaning process can be locally accumulated on the side surface 26. By using such a depot accumulation function, for example, for the side surface 26 during maintenance after continuous operation, etc. Efficient maintenance work can be performed by intensively wiping off.
- the pressure in the chamber 3 is adjusted to a pressure higher than the pressure in the etching process.
- the isotropic characteristics of the generated plasma can be enhanced, and the edge portion 2a of the substrate 2 and the substrate support portion of the tray 15 can be enhanced.
- the plasma can be more easily penetrated into the gap between the two and the deposited depot can be effectively removed.
- a bias voltage may be applied to the metal block 24 by the second high-frequency power supply unit 56 in order to facilitate the generated plasma to enter the gap. In this case, it is desirable that the bias voltage applied during the cleaning process be lower than the bias voltage during the etching process.
- the DC voltage applied from the ESC drive power supply unit 41 to the ESC electrode 40 is lower than the DC voltage applied during the etching process.
- the isotropic characteristics of plasma are enhanced by increasing the pressure in the chamber 3 or the like. Therefore, when the plasma enters the gap between the edge 2 a of the substrate 2 and the substrate support portion 21 of the tray 15, many electrons exist in the vicinity of the substrate holding portion 29.
- the dielectric member constituting the stage upper part 23 including the substrate holding part 29 is provided with a low resistance ceramic (volume resistivity (25 ° C.) in order to secure an electrostatic attraction force on the holding surface 31 of the substrate holding part 29. ) Is 10 10 to 10 11 ⁇ ⁇ cm).
- the DC voltage applied to the ESC electrode 40 built in the substrate holding unit 29 is made lower than the voltage applied in the case of the etching process or zero, so that the ESC electrode 40 Is prevented from causing dielectric breakdown.
- the differential pressure between the cooling gas supplied from the cooling gas supply unit 45 and filled between the substrate 2 and the substrate holding unit 29 with respect to the chamber is also set low according to the magnitude of the electrostatic adsorption force. Or, it is set to zero regardless of the magnitude of the electrostatic adsorption force, that is, the cooling gas supply is shut off.
- the application of the bias voltage to the metal block 24 of the substrate stage 9 by the second high-frequency power supply unit 56 is stopped, and the supply of the cleaning gas is stopped. 15 is completed.
- the setting conditions for the bias voltage and the pressure of the cooling gas in the cleaning process it is most preferable to set both to zero.
- a charge removal process for reducing the residual electrostatic attraction force is performed (step S4).
- the gas supply unit 12 enters the chamber 3 with a different type of static elimination gas (such as an inert gas such as Ar or He or a gas such as O 2 that does not easily contribute to etching) from the cleaning gas. .) Is supplied, and the inside of the chamber 3 is adjusted to a predetermined pressure by the pressure controller 13. Further, the application of the DC voltage to the ESC electrode 40 by the ESC drive power supply unit 41 is stopped. Subsequently, a high frequency voltage is applied from the first high frequency power supply unit 7 to the ICP coil 5.
- a different type of static elimination gas such as an inert gas such as Ar or He or a gas such as O 2 that does not easily contribute to etching
- the applied high frequency voltage is set lower than the voltage applied during the cleaning process. In this state, the electrostatic attraction force remaining between the substrate 2 and the substrate holding portion 29 is reduced by the plasma generated in the chamber 3.
- the cooling gas supply from the cooling gas supply unit 45 is stopped and the space between the substrate 2 and the substrate holding unit 29 is filled prior to the charge removal process. Remove the cooling gas.
- a tray unloading process for unloading each substrate 2 together with the tray 15 from the chamber 3 is performed (step S5).
- each tray push-up rod 18 is raised by the drive mechanism 17.
- the tray push-up rod 18 is raised, the lower surface 15c of the tray 15 is pushed up at the upper end thereof, and the tray 15 is lifted from the tray support portion 28 of the stage upper portion 23.
- the tray 15 is further lifted together with the tray push-up rod 18, the substrate support portion 21 of the tray 15 and the lower surface of the edge portion 2a of the substrate 2 come into contact with each other as shown in FIG. 15, and is lifted from the holding surface 31 of the substrate holding part 29.
- the gate valve 3 a is opened, and the hand portion 81 of the transport mechanism is inserted into the chamber 3. Thereafter, as shown in FIGS. 8C and 8D, the tray 15 in which the substrate 2 is accommodated in each of the four substrate accommodation holes 19 is transferred from the tray push-up rod 18 to the hand portion 81. Then, the substrate 2 supported by the tray 15 is unloaded through the gate valve 3a.
- the plurality of substrates 2 are conveyed by the tray 15 in a state where the edge 2a of the substrate 2 is supported by the substrate support portion 21 of the tray 15.
- the edge of the substrate 2 is etched when the substrate 2 is etched.
- the tray 15 and the substrate It is possible to prevent the depot from falling due to contact with 2. Therefore, it is possible to avoid the occurrence of troubles such as the occurrence of contamination when such a deposit falls on the substrate holding part 29 and the like, and the next processing is performed. Quality can be improved.
- the generated plasma is generated between the edge 2 a of the substrate 2 and the substrate support portion 21 of the tray 15 during the etching process. It is preferable to set so that it does not easily enter.
- the generated plasma is effectively applied to the gap. Must be intruded.
- by increasing the isotropic characteristics of the plasma generated by the cleaning process it is possible to remove the deposited deposit by effectively penetrating the plasma into the gap.
- a gap between the edge 2a of the substrate 2 and the inner wall 15d of the substrate receiving hole 19 of the tray 15 is 0.1.
- the clearance between the lower surface of the edge 2a of the substrate 2 and the upper surface 21a of the substrate support portion 21 of the tray 15 is approximately 0.2 to 0.3 mm, the side wall of the substrate holding portion 29 and the substrate support portion It is preferable that the gap with the tip (inner wall end) of 21 is about 0.5 mm.
- the operating conditions of each processing can be set as follows. These operating conditions are stored in advance in the operating condition storage unit 77 of the control unit 70. These operating conditions are merely examples, and can be set to optimum conditions depending on the type of substrate to be processed, the processing content, and the like.
- Etching process Process gas type and flow rate: BCl 3 , 200cc Processing pressure: 0.6Pa ICP coil applied power: 1400W Bias: 1600W Applied voltage to ESC electrode: 2.0 kV Cooling gas pressure: 2.0 kPa Processing time: 10min
- Static elimination treatment Process gas type and flow rate: Ar, 200cc Processing pressure: 8.0 Pa ICP coil applied power: 200W Bias: 0W Applied voltage to ESC electrode: 0 kV Cooling gas pressure: 0 kPa Processing time: 10 sec
- the side surface 26 of the substrate holding portion 29 is not easily exposed to the plasma of the cleaning process. Can be deposited on the side 26. That is, the depots removed by the cleaning process can be locally accumulated on the side surface 26. By utilizing such a depot accumulation action, for example, for the side surface 26 during maintenance after continuous operation, etc. Efficient maintenance work can be performed by intensively wiping off.
- FIG. 9 is a partial cross-sectional view showing the vicinity of the side surface 26 of the substrate holding part 29 in the stage upper part 23 according to the first modification.
- an annular groove 32 is formed on the outer periphery of the substrate holding portion 29.
- the area of the side surface 26 can be increased by forming the groove 32, more deposits can be deposited and deposited on the side surface 26. Therefore, the maintenance work can be made more efficient.
- the side surface 26 may be formed as an inclined surface.
- the inclination direction may be either direction.
- a curved surface portion 33 may be formed at the boundary portion between the side surface 26 and the tray support portion 28 as shown in FIG. good.
- this invention is not limited to the above-mentioned structure, It can implement in another various aspect.
- the etching method of this embodiment can be applied to a silicon substrate instead of a sapphire substrate.
- the etching processing method of the present embodiment can be applied to a quadrangular substrate instead of the disc-shaped substrate.
- a rectangular substrate is a solar panel substrate.
- a minute concavo-convex structure is formed on the surface of the substrate by etching treatment or surface texture processing, and in that the concavo-convex structure is formed by etching treatment, Common.
- solar panel substrates are often formed of silicon-based materials, and the conveyance of the substrates using a tray is employed.
- the example in which the entire periphery of the edge portion 2a of the substrate 2 is supported by the substrate support portion 21 formed over the entire periphery of the inner wall of the substrate accommodation hole 19 of the tray 15 has been described.
- a configuration in which the substrate support portion 21 is formed on a part of the inner wall of the substrate accommodation hole 19 and the edge portion 2a of the substrate 2 is supported on a part of the outer periphery thereof may be employed.
- etching processing method of the present embodiment is continuously performed on a plurality of trays 15, a cleaning process is performed without placing the trays 15 in the chamber 3, and the etching process adheres to the chamber 3. You may make it remove the depot which is doing.
- the present invention is useful for a method of performing plasma processing on a plurality of substrates that are transported in a state of being accommodated in a tray, and in particular, a roughening treatment of a substrate that forms a minute uneven structure on the substrate surface, It can be applied to a method in which surface texture processing is performed by etching.
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Abstract
Description
チャンバ内において、トレイ支持部とこのトレイ支持部から上向きに突出する複数の基板保持部とを有する基板ステージに対して、トレイ支持部上にトレイを載置するとともにそれぞれの基板保持部上に基板を載置することで、基板保持部の端縁よりはみ出した基板の縁部と基板支持部とを離間させた状態とする基板載置工程と、
チャンバ内へ処理ガスを供給すると共にチャンバ内の圧力を調整して、それぞれの基板に対するプラズマ処理を行う第1プラズマ処理工程と、
トレイおよびそれぞれの基板が基板ステージ上に載置された状態にて、チャンバ内へ処理ガスを供給すると共にチャンバ内の圧力を調整してプラズマ処理を実施し、第1プラズマ処理工程の実施により基板の縁部と基板支持部とに付着した副生成物を除去する第2プラズマ処理工程と、
第2プラズマ処理工程の終了後、基板支持部により基板の縁部を支持した状態にて、トレイとともにそれぞれの基板をチャンバ内より搬出する基板搬出工程と、を含む、基板のプラズマ処理方法を提供する。
第1プラズマ処理工程の終了後、第2プラズマ処理工程を実施する際に、第1プラズマ処理工程における静電吸着の駆動電圧よりも低い駆動電圧に切り換えて静電吸着を行う、第2態様に記載の基板のプラズマ処理方法を提供する。
第2プラズマ処理工程における処理ガスとしてO2/CF4を用いる、第6態様に記載の基板のプラズマ処理方法を提供する。
本発明の実施形態に係るプラズマ処理装置の一例としてICP(誘導結合プラズマ)型のドライエッチング装置1の構成図を図1に示す。
まず、図6のフローチャートにおけるトレイ搬入処理(ステップS1)を実施する。具体的には、ドライエッチング装置1において、ゲートバルブ3aを開放状態とさせる。その後、4個の基板収容孔19にそれぞれ基板2が収容された状態のトレイ15を、搬送機構のハンド部により保持して、例えばロードロック室からゲートバルブ3aを通ってチャンバ3内に搬入する。
次に、エッチング処理(ステップS2)を実施する。具体的には、ガス供給部12からチャンバ3内にエッチング処理用のガスが供給されるとともに、圧力制御部13によりチャンバ3内は所定圧力に調整される。続いて、第1の高周波電源部7からICPコイル5に高周波電圧を印加する。これによりチャンバ3内にプラズマが発生する。
ここで、このようなエッチング処理が行われた直後の基板2およびトレイ15の状態を図7Aおよび図7Bの説明図に示す。図7Aに示すように、トレイ支持部28上にトレイ15が載置され、それぞれの基板保持部29上に基板2が保持されている状態では、トレイ15の基板支持部21の上面21aと基板2の縁部2aの下面との間には、互いに接触しないような隙間が設けられている。このような状態にてエッチング処理が行われると、基板2の縁部2aの下面やその近傍(部分A)、基板2の縁部2aにて隠れてしまっているトレイ15の基板支持部21の上面21aおよびその近傍部分(部分B)では、エッチング処理の際に生じる副生成物であるデポ(デポジション(堆積物))が付着し易い。なお、図中参照符号91は生成されたプラズマ、92はシース、93は付着したデポを模式的に示したものである。
続いて、残留静電吸着力を低減させるための除電処理を実施する(ステップS4)。具体的には、ガス供給部12からチャンバ3内にクリーニング処理用のガスとは異なる種類の除電処理用のガス(ArやHe等の不活性ガスやエッチングに寄与しにくいO2等のガス等。)が供給されるとともに、圧力制御部13によりチャンバ3内を所定圧力に調整する。また、ESC駆動電源部41によるESC電極40への直流電圧の印加を停止する。続いて、第1の高周波電源部7からICPコイル5に高周波電圧を印加する。このとき、印加される高周波電圧は、クリーニング処理の際に印加される電圧よりも低く設定される。この状態において、チャンバ3内に生成されたプラズマにより、基板2と基板保持部29との間に残留している静電吸着力を低減させる。なお、前述のクリーニング処理において冷却ガスを供給している場合は、除電処理に先立ち、冷却ガス供給部45からの冷却ガスの供給を停止して、基板2と基板保持部29との間に充填されている冷却ガスを抜いておく。
続いて、チャンバ3内からそれぞれの基板2をトレイ15とともに搬出するトレイ搬出処理を実施する(ステップS5)。具体的には、図8(A),(B)に示すように、駆動機構17によりそれぞれのトレイ押上ロッド18を上昇させる。トレイ押上ロッド18が上昇すると、その上端でトレイ15の下面15cが押し上げられ、ステージ上部23のトレイ支持部28からトレイ15が浮き上がる。トレイ押上ロッド18とともにトレイ15がさらに上昇すると、図8(B)に示すように、トレイ15の基板支持部21と基板2の縁部2aの下面とが接触して、それぞれの基板2がトレイ15により支持された状態にて押し上げられ、基板保持部29の保持面31から浮き上がる。
処理ガス種・流量: BCl3、200cc
処理圧力: 0.6Pa
ICPコイル印加パワー: 1400W
バイアス: 1600W
ESC電極への印加電圧: 2.0kV
冷却ガス圧力: 2.0kPa
処理時間: 10min
処理ガス種・流量: O2、200cc/CF4、200cc
処理圧力: 8.0Pa
ICPコイル印加パワー: 1800W
バイアス: 0W
ESC電極への印加電圧: 1.0kV
冷却ガス圧力: 1.0kPa
処理時間: 2min
処理ガス種・流量: Ar、200cc
処理圧力: 8.0Pa
ICPコイル印加パワー: 200W
バイアス: 0W
ESC電極への印加電圧: 0kV
冷却ガス圧力: 0kPa
処理時間: 10sec
図9は、変形例1によるステージ上部23における基板保持部29の側面26の近傍を示す部分断面図である。図9(A)に示すように、基板保持部29の外周には、環状の溝32が形成されている。このような構成では、溝32が形成されていることにより側面26の面積を拡大することができるため、側面26に、より多くのデポを付着して堆積させることができる。したがって、メンテナンス作業をより効率的なものにすることができる。
上記実施形態では、トレイ15がトレイ支持部28上に載置された状態にてクリーニング処理が実施されるような場合を例として説明したが、図10(A)、(B)に示すように、クリーニング処理中において、トレイ押上ロッド18によりトレイ15の突き上げ動作を行い、トレイ15をトレイ支持部28より離間させた状態とさせても良い。このようにクリーニング処理中に突き上げ動作を行うことにより、クリーニング効果と側面26へのデポの再付着による集積効果とのバランスを考慮して、基板2の縁部2aの下面とトレイ15の基板支持部21との間の隙間の大きさを制御することができ、効率的なクリーニング処理を実現できる。
Claims (9)
- 基板が収容される複数の基板収容孔が設けられ、この基板収容孔の内壁から突出する基板支持部を有するトレイを用いて、基板支持部にその縁部が支持されて基板収容孔に収容された状態の複数の基板をチャンバ内に搬入する基板搬入工程と、
チャンバ内において、トレイ支持部とこのトレイ支持部から上向きに突出する複数の基板保持部とを有する基板ステージに対して、トレイ支持部上にトレイを載置するとともにそれぞれの基板保持部上に基板を載置することで、基板保持部の端縁よりはみ出した基板の縁部と基板支持部とを離間させた状態とする基板載置工程と、
チャンバ内へ処理ガスを供給すると共にチャンバ内の圧力を調整して、それぞれの基板に対するプラズマ処理を行う第1プラズマ処理工程と、
トレイおよびそれぞれの基板が基板ステージ上に載置された状態にて、チャンバ内へ処理ガスを供給すると共にチャンバ内の圧力を調整してプラズマ処理を実施し、第1プラズマ処理工程の実施により基板の縁部と基板支持部とに付着した副生成物を除去する第2プラズマ処理工程と、
第2プラズマ処理工程の終了後、基板支持部により基板の縁部を支持した状態にて、トレイとともにそれぞれの基板をチャンバ内より搬出する基板搬出工程と、を含む、基板のプラズマ処理方法。 - 第1プラズマ処理工程の終了後、第2プラズマ処理工程を実施する際に、第1プラズマ処理工程における処理ガスとは異なる種類の処理ガスに切り換えるとともに、第1プラズマ処理工程における圧力よりも高い圧力にて第2プラズマ処理工程を行う、請求項1に記載の基板のプラズマ処理方法。
- 第1プラズマ処理工程において、それぞれの基板を静電吸着により基板保持部に吸着保持するとともに、基板と基板保持部の間に所定の圧力で供給される冷却ガスにより冷却しながら、プラズマ処理を行い、
第1プラズマ処理工程の終了後、第2プラズマ処理工程を実施する際に、第1プラズマ処理工程における静電吸着の駆動電圧よりも低い駆動電圧に切り換えて静電吸着を行う、請求項2に記載の基板のプラズマ処理方法。 - 第2プラズマ処理工程を実施する際に、第1プラズマ処理工程における冷却ガスの圧力よりも低い圧力に切り換える、請求項3に記載の基板のプラズマ処理方法。
- 第2プラズマ処理工程を実施する際の静電吸着の駆動電圧と、第2プラズマ処理工程におけるチャンバ内部の圧力と冷却ガスとの差圧がゼロである、請求項4に記載の基板のプラズマ処理方法。
- 基板としてサファイア基板を用い、第1プラズマ処理工程において、サファイア基板の表面に微小な凹凸構造を形成するプロセスを、プラズマ処理として行う、請求項3に記載の基板のプラズマ処理方法。
- 第1プラズマ処理工程における処理ガスとしてBCl3を用い、
第2プラズマ処理工程における処理ガスとしてO2/CF4を用いる、請求項6に記載の基板のプラズマ処理方法。 - 第2プラズマ処理工程の終了後、除電プラズマを発生させて、基板と基板保持部との間の残留静電吸着力を低減させる除電工程を実施する、請求項3から7のいずれか1つに記載の基板のプラズマ処理方法。
- 第2プラズマ処理工程において、除去した副生成物を基板保持部の側面に集積させる、請求項1から8のいずれか1つに記載の基板のプラズマ処理方法。
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US20130168353A1 (en) | 2013-07-04 |
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JP2012099781A (ja) | 2012-05-24 |
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