WO2005048337A1 - プラズマ着火方法および基板処理方法 - Google Patents
プラズマ着火方法および基板処理方法 Download PDFInfo
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- WO2005048337A1 WO2005048337A1 PCT/JP2004/016588 JP2004016588W WO2005048337A1 WO 2005048337 A1 WO2005048337 A1 WO 2005048337A1 JP 2004016588 W JP2004016588 W JP 2004016588W WO 2005048337 A1 WO2005048337 A1 WO 2005048337A1
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- processing
- gas
- substrate
- plasma
- processing container
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- 238000000034 method Methods 0.000 title claims abstract description 66
- 239000000758 substrate Substances 0.000 title claims description 157
- 238000003672 processing method Methods 0.000 title claims description 21
- 238000012545 processing Methods 0.000 claims abstract description 250
- 239000007789 gas Substances 0.000 claims abstract description 133
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 43
- 239000001301 oxygen Substances 0.000 claims abstract description 39
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 32
- 230000008569 process Effects 0.000 claims description 44
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 37
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 29
- 150000003254 radicals Chemical class 0.000 claims description 28
- 238000011282 treatment Methods 0.000 claims description 26
- 230000001678 irradiating effect Effects 0.000 claims description 16
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 14
- 229910001882 dioxygen Inorganic materials 0.000 claims description 14
- 150000002831 nitrogen free-radicals Chemical class 0.000 claims description 12
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052814 silicon oxide Inorganic materials 0.000 description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- 238000010586 diagram Methods 0.000 description 12
- 229910052710 silicon Inorganic materials 0.000 description 12
- 239000010703 silicon Substances 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 11
- -1 oxygen radicals Chemical class 0.000 description 11
- 150000002500 ions Chemical class 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000013626 chemical specie Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
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- 238000007254 oxidation reaction Methods 0.000 description 5
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- 238000002474 experimental method Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- CWWIIKLXUPZDOG-UHFFFAOYSA-N 2',6'-difluorobiphenyl-4-carboxylic acid Chemical compound C1=CC(C(=O)O)=CC=C1C1=C(F)C=CC=C1F CWWIIKLXUPZDOG-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229910006501 ZrSiO Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011257 definitive treatment Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
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Classifications
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- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
-
- 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
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02126—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
- H01L21/0214—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC the material being a silicon oxynitride, e.g. SiON or SiON:H
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/0223—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate
- H01L21/02233—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer
- H01L21/02236—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer group IV semiconductor
- H01L21/02238—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer group IV semiconductor silicon in uncombined form, i.e. pure silicon
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/02249—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by combined oxidation and nitridation performed simultaneously
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
- H01L21/02321—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer
- H01L21/02329—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer introduction of nitrogen
- H01L21/02332—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer introduction of nitrogen into an oxide layer, e.g. changing SiO to SiON
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
- H01L21/02337—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour
- H01L21/0234—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour treatment by exposure to a plasma
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
- H01L21/3165—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation
- H01L21/31654—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation of semiconductor materials, e.g. the body itself
- H01L21/31658—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation of semiconductor materials, e.g. the body itself by thermal oxidation, e.g. of SiGe
- H01L21/31662—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation of semiconductor materials, e.g. the body itself by thermal oxidation, e.g. of SiGe of silicon in uncombined form
Definitions
- the present invention relates to the manufacture of semiconductor devices, and more particularly to a substrate processing apparatus that uses oxygen radicals and nitrogen radicals.
- the thickness of the gate insulating film must be set to 112 nm or less when a conventional thermal oxide film is used. With a very thin gate insulating film, the problem of increased tunnel current and consequent increase of gate leakage current cannot be avoided.
- the relative dielectric constant is much larger than that of the thermally oxidized film, so that even if the actual film thickness is large, the film thickness in terms of SiO film is small.
- a very thin base oxide having a thickness of 1 nm or less, preferably 0.8 nm or less is provided between the high-dielectric gate oxide film and the silicon substrate. It is preferable to interpose a dani film.
- the base oxide film needs to be very thin. If the thickness is large, the effect of using the high dielectric film as the gate insulating film is offset. On the other hand, such a very thin base oxide film needs to cover the silicon substrate surface uniformly, It is required that defects such as position are not formed.
- a thin gate oxide film is generally formed by rapid thermal oxidation (RTO) treatment of a silicon substrate, but the thermal oxide film is formed to a desired thickness of 1 nm or less.
- RTO rapid thermal oxidation
- the thermal oxidation film formed at such a low temperature contains defects such as interface states and is not suitable as a base oxidation film for a high dielectric gate oxidation film immediately.
- UV-excited oxygen radical UV-O radical
- FIG. 1 is a schematic configuration of the conventional UV-O radical substrate processing apparatus 20 proposed.
- the substrate processing apparatus 20 houses a substrate holding table 22 provided with a heater (not shown) and provided so as to be vertically movable between a process position and a substrate loading / unloading position. Further, a processing container 21 that defines a process space 21B together with the substrate holder 22 is provided, and the substrate holder 22 is rotated by a driving mechanism 22C. The inner wall surface of the processing container 21 is covered with an inner liner (not shown) made of quartz glass, thereby suppressing metal contamination of the substrate to be processed from the exposed metal surface.
- the processing container 21 is coupled to the substrate transport unit 27 via a gate valve 27A.
- the substrate holding table 22 is lowered to the loading / unloading position, the substrate is transported through the gate valve 27A.
- the substrate W to be processed is transported from the transport unit 27 onto the substrate holder 22, and the processed substrate W is transported from the substrate holder 22 to the substrate transport unit 27.
- an exhaust port 21A is formed in a portion of the processing container 21 near the gate valve 27A, and the exhaust port 21A has a valve 23A and an APC (automatic pressure control device, FIG. (Not shown) and a turbo molecular pump (TMP) 23B coupled thereto.
- a dry pump (DP) 24 is further connected to the turbo molecular pump 23B via a valve 23C to drive the turbo molecular pump 23B and the dry pump 24. Accordingly, the pressure of the process space 21B 1.
- 33 X 10- 1 - it is possible to reduced to - (10- 6 Torr 10- 3) 1.
- the exhaust port 218 is another rivet 24?
- the process space 21B is connected directly to the pump 24 through a slot (not shown), and by opening the valve 24A, the process space 21B is moved to 1.33 Pa—1.33 kPa (0.01 — LOTorr).
- the processing vessel 21 is provided with a processing gas supply nozzle 21D to which an oxygen gas is supplied on a side opposite to the exhaust port 21A with the substrate W to be separated, and the processing gas supply nozzle is provided.
- the oxygen gas supplied to 21D flows in the process space 21B along the surface of the substrate W to be processed, and is exhausted from the exhaust port 21A.
- a radical oxidation film having a film thickness of 1 nm or less, in particular, a film thickness of about 0.4 nm corresponding to a thickness of 2-3 atomic layers is uniformly formed on the surface of the substrate W to be processed. It can be formed.
- the process space 21B is suitable for oxidizing the substrate with oxygen radicals.
- 33 X 10- 1 - is pressed reduced to a pressure range of - (10- 6 Torr 10- 3) 1.
- a remote plasma source 26 is formed on the side of the processing target substrate W facing the exhaust port 21A. Therefore, by supplying a nitrogen gas together with an inert gas such as Ar to the remote plasma source 26 and activating the nitrogen gas with plasma, it is possible to form nitrogen radicals.
- the nitrogen radicals thus formed flow along the surface of the substrate W to be processed, as shown in FIG. 2, and nitride the substrate surface. This In the case of the plasma nitriding treatment shown in FIG. Reduced to pressure.
- By performing such a plasma nitridation process it is possible to perform a nitridation process on the very thin oxide film having a thickness of about 0.4 nm previously formed in the step of FIG.
- Patent document 1 WO03Z04913A1
- Patent Document 2 JP-T-2002-517914
- Patent Document 3 JP-A-11-71680
- Patent Document 4 JP-A-5-198515
- a more specific object of the present invention is to provide a plasma ignition method capable of efficiently realizing plasma ignition and a substrate processing method using a powerful plasma ignition method.
- Another object of the present invention is to provide
- a gas containing the oxygen is exhausted while exhausting the inside of the processing container. Irradiating the substrate with ultraviolet light;
- An object of the present invention is to provide a plasma ignition method, which comprises a step of driving the plasma source after the step of irradiating the ultraviolet light.
- Another object of the present invention is to provide
- a substrate processing method including a plasma ignition step of igniting plasma in a plasma source provided in a processing container,
- the step of igniting the plasma by driving the plasma source After the step of irradiating the ultraviolet light, the step of igniting the plasma by driving the plasma source,
- An object of the present invention is to provide a substrate processing method including a step of processing a surface of a substrate to be processed by the radical.
- Another object of the present invention is to provide
- the method includes a step of removing the processing gas from a pipe for supplying the processing gas to the plasma source, and further including the step of supplying the processing gas.
- the step includes a step of gradually increasing the flow rate of the processing gas to a predetermined flow rate
- the step of increasing the flow rate of the processing gas is to provide a substrate processing method that is executed so that the substrate to be processed rotates at least one time until the nitrogen gas flow rate reaches the predetermined flow rate.
- a substrate processing method that further includes a step of introducing nitrogen radicals into the inside of the processing container and a step of exhausting the inside of the processing container after repeating the step of processing the surface of the substrate to be processed a predetermined number of times. It is in.
- a plasma ignition method for igniting plasma by a plasma source provided on a processing container and a substrate processing method using a powerful ignition method are provided in a processing container.
- a gas containing oxygen is allowed to flow, and in the processing container, the gas containing oxygen is irradiated with ultraviolet light while exhausting the inside of the processing container, and the plasma source is driven to adhere to the inner wall of the processing container.
- the water that has been removed is desorbed and plasma ignition becomes easier.
- a step of supplying a rare gas to a plasma source to form plasma, and a step of supplying a processing gas to the plasma source after the plasma is formed
- a substrate processing method comprising: forming an active species of the processing gas; and flowing the active species along a surface of the substrate to be processed, and treating a surface of the substrate to be processed with the active species.
- the target substrate is performed such that at least one rotation to eliminate overshoot problems of the process gas flow amount at the start processing gas supply, also it is possible to form a uniform film on the substrate front surface
- a gas containing oxygen is excited by ultraviolet light inside the processing container.
- the step of forming a radical and forming a radical and the step of processing the surface of the substrate with the radical inside the processing container are performed in a predetermined manner.
- the step of introducing nitrogen radicals into the processing vessel and the step of evacuating the processing vessel are performed, whereby the accumulation of residual HO in the processing vessel is suppressed. And formed on the substrate to be processed
- the thickness of the film to be formed is suppressed.
- FIG. 1 is a view showing a conventional substrate processing apparatus.
- FIG. 2 is a view showing another state of the substrate processing apparatus of FIG. 1.
- FIG. 3 is a diagram showing a configuration of a remote plasma source used in the substrate processing apparatus of FIG. 1.
- FIG. 4 is a diagram illustrating a first embodiment of the present invention.
- FIG. 5 is another diagram for explaining the first embodiment of the present invention.
- FIG. 6A is a flowchart illustrating a first embodiment of the present invention.
- FIG. 6B is a flowchart illustrating a modification of the first embodiment of the present invention.
- FIG. 7 is a diagram illustrating a second embodiment of the present invention.
- FIG. 8 is a diagram illustrating a second embodiment of the present invention.
- FIG. 9 is a diagram showing a plasma ignition sequence according to a second embodiment of the present invention.
- FIG. 10 is a diagram illustrating a third embodiment of the present invention.
- FIG. 11 is another diagram illustrating a third embodiment of the present invention.
- FIG. 12 is yet another view for explaining the third embodiment of the present invention.
- FIG. 13 is a diagram illustrating a fourth embodiment of the present invention.
- FIG. 14 is a diagram showing a configuration of a computer used in FIG.
- FIG. 3 shows a configuration of a high-frequency plasma source used as the remote plasma source 26 in the substrate processing apparatus 20 of FIG.
- the remote plasma source 26 includes a block 26A, typically made of aluminum, in which a gas circulation passage 26a and a gas inlet 26b and a gas outlet 26c communicating with the gas circulation passage 26a are formed.
- a ferrite core 26B is formed on a part of the block 26A. Yes.
- An insulating member 26dc for blocking direct current is formed in a part of the block 26A.
- An alumite treatment film 26d is formed on the inner surfaces of the gas circulation passage 26a, the gas inlet 26b, and the gas outlet 26c, and the alumite treatment film 26d is further impregnated with fluorine resin.
- a high frequency (RF) power having a frequency force of 00 kHz to the coil wound around the ferrite core 26B, a plasma 26C is formed in the gas circulation passage 26a.
- the inventor of the present invention introduced a gas containing oxygen into the process space 21 B of the processing vessel 21 before the plasma ignition by the plasma source 26, and further introduced the ultraviolet light source 2. It was found that when UV light with a wavelength of 172 nm was applied to the inside of the processing vessel by driving Step 5, the plasma was immediately ignited. This is considered to be because active species are formed in the process space 21B by the ultraviolet light irradiation, and the active species flow into the remote plasma source 26 to cause ignition.
- FIG. 4 shows the results of a small experiment. However, in FIG. 4, “UVO” is inside the processing vessel 21
- “RFN” depressurizes the inside of the processing vessel 21 to a pressure of 6.65 Pa (50 mTorr) at the exhaust port 21A, and separates Ar gas and nitrogen gas from the remote radical source 26, respectively.
- a flow rate of 1280 SCCM and 75 SCCM and further driving the remote radical source 26 with a high frequency power of 00 kHz at a frequency of 00 kHz while sandwiching a vacuum evacuation step by a turbo molecular pump 23 for 60 seconds for 60 times every 60 seconds.
- the results of analyzing the chemical species remaining in the processing vessel 21 by evacuating the interior of the processing vessel 21 by the turbo-molecular pump 23 are shown.
- the substrate holding table 22 when the temperature of the substrate holding table 22 is raised to 550 ° C. immediately after the start of the operation of the substrate processing apparatus 20, the substrate holding table 22 is released into the processing container 21, that is, detached from the wall surface.
- the amount of HO molecules present in separated state was about 1 X 10- 8 Alpha and the ion current value
- the concentration of H +,-, OH-, O, N, and the like can be similarly controlled by driving the ultraviolet light source 25.
- the magnitude of the force is less than that of HO except for OH related to H0 formation.
- Activated species (HO, ⁇ -, H +, etc.) generated in the space 21B enter the plasma source 26.
- this UVO step may be performed before plasma ignition in the RFN step.
- the RFN process when the RFN process is performed after the UVO process, the RFN process remains in the processing container 21.
- H +, ⁇ -, OH-, O, N, etc. are released simultaneously with the release of H 2 O molecules.
- FIG. 5 shows the release in the processing vessel 21 when the time of the UVO treatment was changed.
- FIG. 6A is a flowchart illustrating an example of a substrate processing step according to the first embodiment of the present invention.
- Step 2 the operation of the substrate processing apparatus 20 that has been left for a long time in Step 1 or the inside of the processing container and the plasma source 26 have been opened to the atmosphere due to maintenance. Is restarted, and in step 2, the pressure inside the processing vessel 21 and the plasma source 26 is reduced to a pressure of 6.65 Pa, and the ultraviolet light source 25 is driven for 5 minutes or more while passing oxygen gas. Processing is executed.
- a silicon substrate is introduced into the processing container 21 as the substrate to be processed W, and further in step 4.
- the thickness of the silicon substrate surface is reduced.
- step 4 the inside of the processing vessel 21 and the plasma source 26 are purged with Ar gas or nitrogen gas, and in step 5, the Ar gas is introduced into the processing vessel 21 through the plasma source 26.
- the pressure is set to, for example, 133 Pa (lTorr), plasma is ignited in the plasma source 26, and nitrogen gas is further supplied to the plasma source 26 to form active nitrogen. Is performed to nitride the surface of the oxide film.
- FIG. 6B is a flowchart showing an example of a substrate processing step in the case where a silicon oxide film has already been formed on the substrate.
- step 2 the operation of the substrate processing apparatus 20 that has been left for a long time in step 11 or the inside of the processing container and the plasma source 26 have been opened to the atmosphere due to maintenance is restarted. UVO processing corresponding to step 2 is executed.
- Step 13 the silicon substrate on which the silicon oxide film has already been formed in Step 13 is introduced into the processing container 21 as the substrate to be processed W, and in Step 14 corresponding to Step 5, the silicon A nitridation process of the film is performed.
- the UVO step of step 2 or step 12 is performed prior to the actual substrate processing step after step 3 or step 13 to activate the inner wall of the plasma source 26.
- the UVO treatment step of step 2, 12 or step 4 is performed.
- Definitive treatment pressure is the 6.1 at an oxygen partial pressure Nag limited to 65Pa (50mTorr) 33 X 10- 3 - can be used a pressure ranging from 133 Pa.
- the Ar gas and the processing gas that is, the nitrogen gas are simultaneously supplied to supply the plasma. If you try to ignite, the ignition conditions are very limited and the ignition is not easy.
- FIG. 7 is a diagram showing a gas supply sequence in such a remote plasma source 26.
- Ar gas is supplied to the remote plasma source 26 at timing t.
- the plasma is ignited by supplying high-frequency power at timing t.
- the flow rate of the nitrogen gas is gradually increased so that the vona is stably maintained.
- the substrate processing apparatus 20 configured to supply nitrogen radicals N * from the side of the rotating substrate to be processed as shown in FIG. It is no longer effective, and as shown in Fig. 8, the thickness of the formed nitride film is locally increased in the region close to the remote plasma source 26 at the moment when the overshoot occurs. Becomes uneven. In such a case, especially the film thickness is 0.4 nm. When a silicon oxide film having a very small thickness is etched, a serious problem occurs.
- Such an overshoot at the start of the supply of nitrogen gas is caused by the fact that the nitrogen gas remaining in the pipe for supplying the nitrogen gas to the remote plasma source 26 is released at once at the start of the supply of the nitrogen gas. It is considered.
- FIG. 1 is referred to again.
- FIG. 1 shows a configuration of a gas supply system for supplying nitrogen gas to the remote plasma source 26.
- Ar gas is supplied to the remote plasma source 26 from an Ar gas source 101 via a valve 101A, a mass flow controller 101B, a valve 101C, and a pipe 101a.
- nitrogen gas is supplied via a valve 102A, a mass flow controller 102B, a valve 102C, a pipe 102a, and a pipe 101a.
- oxygen gas is supplied to the gas nozzle 21D from an oxygen gas source 103 via a valve 103A, a mass flow controller 103B, a valve 103C, and a pipe 103a.
- the pipes 101a, 102a, and 103a are connected by a pipe 104a, and therefore, by operating the valves 101A, 101B, 102A, 102B, 103A, and 103B, the Ar gas and the nitrogen gas source in the Ar gas source 101 are Any gas of the nitrogen gas in 102 and the oxygen gas in the oxygen gas source 103 can be supplied to the remote plasma source 26 or the gas nozzle 21D together with another gas as required.
- the pipes 101a and 103a are provided with valves 101D and 103D, respectively.
- valves 101A-101D, 102A-102C, 103A-103D are all closed forces.
- the pipe 101a is upstream of the valve 101D.
- the side portion, that is, the pipe section of the pipes 102a, 104a and 101a separated by the valve 102A and the valve 101D is filled with nitrogen gas, and the valve 101D is opened at the start of the RFN process. Then, it is considered that the trapped nitrogen gas flows into the remote radical source 26 to cause the overshoot. Therefore, when igniting the plasma in the remote plasma source 26, first, only the Ar gas with a low ionization energy is supplied to ignite the plasma. Then, a sequence is used in which nitrogen gas is gradually added so that the plasma does not disappear.
- valve 101D before driving the remote plasma source 26 at a high frequency to ignite the plasma, the valve 101D is opened, and the sealed nitrogen gas is discharged through the processing vessel 21. And exhaust by the turbo molecular pump 23B.
- valve 102A opening the valve 102A and further driving the mass flow controller 102B, it is possible to supply nitrogen gas to the remote plasma source 26 without causing overshoot as shown in FIG. Will be possible.
- the mass flow controller 102B controls the rate of increase in the flow rate of the nitrogen gas so that the target substrate W is rotated one or more times during a period T during which the flow rate of the nitrogen gas increases to a predetermined flow rate.
- the moisture adhering to the inner wall of the vessel 21 is desorbed, and as a result, the concentration of H 2 O remaining in the process space 21B increases. Similar desorption of water is performed in the substrate processing apparatus 20 shown in FIG.
- Nozzle 21D Cara NO gas is introduced and excited by the ultraviolet light source 25 to form nitrogen radical N * and oxygen radical O *, and the formed nitrogen radical N * and oxygen radical O * are used. Also occurs during UVNO processing to form a SiON film on the silicon substrate surface
- the 22 o concentration was almost constant regardless of the number of substrate treatments.
- the concentration of HO remaining in the process space 21B depends on the substrate processing. It increases with the number of times. On the other hand, the concentration of HO remaining in the process space 21B is
- the thickness of the formed SiON film may increase.
- FIG. 10 shows the relationship between the thickness of the obtained SiON film and the number of times of substrate processing when such UVNO processing is repeatedly performed in the substrate processing apparatus 20 of FIG.
- the film thickness is determined by a method using spectroscopic ellipsometry.
- the UVNO treatment was performed under a pressure of 13.3 Pa and a substrate temperature of 700 ° C.
- the thickness of the SiON film formed on the silicon substrate by the UVNO process tends to increase with the number of times of the substrate processing (wafer #), particularly when the number of the processing exceeds 150 times. It can be seen that a clear film increase has occurred.
- the RFN process is performed for 60 seconds after the 250 substrates are processed, and the processing container 21 is evacuated five times for 60 seconds each with the pump TMP23B. It can be seen that the thickness of the SiON film sharply decreases.
- the RFN process and the exhaust process are periodically performed every time the number of processed substrates reaches 150, thereby suppressing an increase in the SiON film formed on the silicon substrate. That's all.
- FIG. 11 shows the thickness and uniformity of the SiON film in the case where the RFN process described in the previous embodiment and the subsequent exhaust process are performed for every 25 substrates to be processed. However, the RFN processing and the exhaust processing are performed in a state where the substrate W to be processed is taken out of the processing container 21.
- FIG. 12 shows that the chemical species remaining in the processing vessel 21 when the conditions for performing the RFN treatment and the exhaust treatment are changed are ⁇ +, H, ⁇ -, OH-, HO, N, NO
- the lowest residual H 0 concentration is obtained when RFN treatment 60 seconds and evacuation treatment 60 seconds are repeated 6 times.
- the moisture released from the side wall surface of the processing container 21 can be prevented from being accumulated in the processing space 21B, and the increase in the film to be formed can be suppressed.
- the processing container 21 is open to the atmosphere or in an idle state for a long time, the UVO processing inside the plasma source is performed.
- FIG. 13 is a diagram showing the configuration of the substrate processing apparatus 20 used in each of the above embodiments, including its control system. However, in FIG. 13, the parts described above are denoted by the same reference numerals, and description thereof will be omitted.
- the substrate processing apparatus 20 cooperates with a control apparatus 100 including a computer on which a control program is installed, and the control apparatus 100 operates according to the control program.
- Exhaust system including molecular pump 23B, dry pump 24, valves 23A, 23C, 24A, substrate transport unit 27, processing container including substrate holder 22 and drive mechanism 22C, radicals including ultraviolet light source 25 and remote plasma source 27 around processing vessel
- the gas supply system including the forming section, the gas source 101-103 and the valve's mass flow controller 101A-101D, 102A-102C, 103A-103D is controlled.
- These controls include the control shown in the flowcharts of FIGS. 6A and 6B, the control shown in FIGS. 7 and 9, and the control shown in FIGS.
- the computer constituting control device 100 in FIG. 13 has the configuration shown in FIG. 14, and may be a general-purpose computer.
- a computer 100 includes a processor (CPU) 151, a memory (RAM) 152, a program storage device (HDD) 153, and a disk such as a floppy drive or an optical disk drive, which are connected via a bus 150.
- the computer 100 controls the substrate processing apparatus 20 via the interface 158, including a drive 154, an input device 155 such as a keyboard and a mouse, a display device 156, a network interface 157, and an interface 158.
- the disk drive is mounted with a computer such as a floppy disk or an optical disk or a read storage medium 159, reads a control program code of the substrate processing apparatus 20 recorded on the storage medium 159, and reads the control program code in the HDD 153.
- a computer such as a floppy disk or an optical disk or a read storage medium 159
- reads a control program code of the substrate processing apparatus 20 recorded on the storage medium 159 reads the control program code in the HDD 153.
- the control program code can be supplied from a network via a network interface 157.
- the program code supplied in this manner is developed in the RAM 152, and the CPU 151 controls the substrate processing apparatus 20 via the interface 158 according to the program code in the RAM 152. Thereby, the substrate processing apparatus 20 performs the operation described in the previous embodiment.
- the control program code can be directly expanded from the disk drive 154 or the network interface 157 into the RAM 152 without being stored in the HDD 153.
- the present invention is not limited to the substrate processing apparatus of the type described in FIGS. 1 and 2, but may be applied to any substrate processing apparatus provided with a plasma source and an ultraviolet light source. Is possible. Further, in the present invention, the plasma source is not limited to the remote plasma source described in FIG.
- a plasma ignition method for igniting plasma by a plasma source provided on a processing container and a substrate processing method using a powerful ignition method are provided in a processing container.
- a gas containing oxygen is allowed to flow, and in the processing vessel, By irradiating the gas containing oxygen with ultraviolet light while evacuating the part and driving the plasma source, moisture adhering to the inner wall of the processing container is desorbed, and the ignition of the plasma is facilitated.
- a step of supplying a rare gas to a plasma source to form plasma, and a step of supplying a processing gas to the plasma source after the plasma is formed
- a substrate processing method comprising: forming an active species of the processing gas; and flowing the active species along a surface of the substrate to be processed, and treating a surface of the substrate to be processed with the active species.
- the target substrate is performed such that at least one rotation to eliminate overshoot problems of the process gas flow amount at the start processing gas supply, also it is possible to form a uniform film on the substrate front surface
- a step of exciting oxygen-containing gas with ultraviolet light to form radicals inside the processing vessel and treating the surface of the substrate to be processed with the radicals inside the processing vessel In the substrate processing method, the step of processing the surface of the substrate to be processed is repeated a predetermined number of times, and thereafter, a step of introducing nitrogen radicals into the inside of the processing container, and a step of exhausting the inside of the processing container.
- the thickness of the film to be formed is suppressed.
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JP2005515423A JP4593477B2 (ja) | 2003-11-14 | 2004-11-09 | 基板処理方法 |
US11/432,332 US7497964B2 (en) | 2003-11-14 | 2006-05-12 | Plasma igniting method and substrate processing method |
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JP (1) | JP4593477B2 (ja) |
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Cited By (3)
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JP2007165805A (ja) * | 2005-12-16 | 2007-06-28 | National Univ Corp Shizuoka Univ | 結晶成長方法及び結晶成長装置 |
JP2018512727A (ja) * | 2015-02-23 | 2018-05-17 | アプライド マテリアルズ インコーポレイテッドApplied Materials,Incorporated | 高品質薄膜を形成するための周期的連続処理 |
JP7039085B1 (ja) | 2021-08-30 | 2022-03-22 | 株式会社クリエイティブコーティングス | 成膜装置 |
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US7704887B2 (en) * | 2005-11-22 | 2010-04-27 | Applied Materials, Inc. | Remote plasma pre-clean with low hydrogen pressure |
US20090277874A1 (en) * | 2008-05-09 | 2009-11-12 | Applied Materials, Inc. | Method and apparatus for removing polymer from a substrate |
JP5363856B2 (ja) * | 2009-03-30 | 2013-12-11 | 富士フイルム株式会社 | パターン形成方法 |
US10049881B2 (en) | 2011-08-10 | 2018-08-14 | Applied Materials, Inc. | Method and apparatus for selective nitridation process |
KR101448449B1 (ko) | 2014-01-13 | 2014-10-13 | 주식회사 테라텍 | 고밀도 구속 플라즈마 소스를 이용한 과불화탄소 및 유해 가스 분해 장치 |
US10232954B2 (en) * | 2016-09-21 | 2019-03-19 | The Boeing Company | Apparatuses and methods for reducing ozone creation from ultraviolet (UV) light |
US11348784B2 (en) | 2019-08-12 | 2022-05-31 | Beijing E-Town Semiconductor Technology Co., Ltd | Enhanced ignition in inductively coupled plasmas for workpiece processing |
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2004
- 2004-11-09 WO PCT/JP2004/016588 patent/WO2005048337A1/ja active Application Filing
- 2004-11-09 KR KR1020067008883A patent/KR100801770B1/ko active IP Right Grant
- 2004-11-09 JP JP2005515423A patent/JP4593477B2/ja active Active
- 2004-11-09 CN CNB2004800080049A patent/CN100463120C/zh not_active Expired - Fee Related
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WO2003049173A1 (fr) * | 2001-12-07 | 2003-06-12 | Tokyo Electron Limited | Procede de nitruration de film isolant, dispositif a semi-conducteur et son procede de production et dispositif et procede de traitement de surface |
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JP2007165805A (ja) * | 2005-12-16 | 2007-06-28 | National Univ Corp Shizuoka Univ | 結晶成長方法及び結晶成長装置 |
JP2018512727A (ja) * | 2015-02-23 | 2018-05-17 | アプライド マテリアルズ インコーポレイテッドApplied Materials,Incorporated | 高品質薄膜を形成するための周期的連続処理 |
JP7039085B1 (ja) | 2021-08-30 | 2022-03-22 | 株式会社クリエイティブコーティングス | 成膜装置 |
JP2023034309A (ja) * | 2021-08-30 | 2023-03-13 | 株式会社クリエイティブコーティングス | 成膜装置 |
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US7497964B2 (en) | 2009-03-03 |
CN100463120C (zh) | 2009-02-18 |
JP4593477B2 (ja) | 2010-12-08 |
US20060205188A1 (en) | 2006-09-14 |
CN1765008A (zh) | 2006-04-26 |
KR100801770B1 (ko) | 2008-02-05 |
KR20060086398A (ko) | 2006-07-31 |
JPWO2005048337A1 (ja) | 2007-05-31 |
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