WO2004003988A1 - プラズマ処理方法 - Google Patents
プラズマ処理方法 Download PDFInfo
- Publication number
- WO2004003988A1 WO2004003988A1 PCT/JP2003/007960 JP0307960W WO2004003988A1 WO 2004003988 A1 WO2004003988 A1 WO 2004003988A1 JP 0307960 W JP0307960 W JP 0307960W WO 2004003988 A1 WO2004003988 A1 WO 2004003988A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- plasma
- etching
- processing method
- gas
- Prior art date
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- 238000003672 processing method Methods 0.000 title claims abstract description 165
- 239000012044 organic layer Substances 0.000 claims abstract description 32
- 239000010410 layer Substances 0.000 claims description 805
- 238000005530 etching Methods 0.000 claims description 602
- 239000007789 gas Substances 0.000 claims description 404
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- 229910052799 carbon Inorganic materials 0.000 claims description 48
- 238000001020 plasma etching Methods 0.000 claims description 35
- 238000009832 plasma treatment Methods 0.000 claims description 33
- 229910052731 fluorine Inorganic materials 0.000 claims description 31
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- 229910052739 hydrogen Inorganic materials 0.000 claims description 18
- 239000011261 inert gas Substances 0.000 claims description 16
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 8
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 7
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 7
- 125000001153 fluoro group Chemical group F* 0.000 claims description 6
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 5
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- 229910018540 Si C Inorganic materials 0.000 description 3
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- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
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- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32192—Microwave generated discharge
-
- 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
- H01L21/02118—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 carbon based polymeric organic or inorganic material, e.g. polyimides, poly cyclobutene or PVC
-
- 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
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
- H01L21/31116—Etching inorganic layers by chemical means by dry-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
- H01L21/02—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
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31144—Etching the insulating layers by chemical or physical means using masks
Definitions
- the present invention relates to a plasma processing method performed in a semiconductor device manufacturing process.
- a resist mask such as a photoresist is used.
- a resist mask such as a photoresist is used.
- recently response forte about 0 to the request of the microfabrication. 1 3 xm following A r F off Ototorejisu Bok and F 2 photo suitable for forming an opening pattern Regis Bok, i.e., A r F gas or F 2 gas Photoresists that are exposed with a single laser beam using a light source as a light source are often used.
- the ArF photoresist layer and the F2 photoresist layer have low plasma resistance, there is a problem that the surface of the photoresist layer becomes rough during etching.
- the shape of the opening changes with the progress of etching, so that it is impossible to form an etching hole or an etching groove having a designed shape.
- a part of the photoresist layer is lost in the middle of the etching, and a part that should not be etched is etched.
- a method for improving the plasma resistance of the photoresist layer As a method for improving the plasma resistance of the photoresist layer, a method of irradiating the surface of the photoresist layer with an ultraviolet ray, an electron beam, or an ion beam (Japanese Patent Application Laid-Open Nos. Hei 6-110124, Hei 2-25) Japanese Patent Application Laid-Open No. 22333, Japanese Unexamined Patent Application Publication No. 57-157532), a method of heating and curing a photoresist (Japanese Patent Application Laid-Open No. Hei 4-2325) and a method in which heat or light energy is applied to an organic Si compound to coat a thin cured layer on the photoresist layer surface (Japanese Patent Application Laid-Open No.
- the plasma resistance must be improved in a container different from the container used in the subsequent etching step.
- Transporting the object to be processed from the container that performs the process for improving the plasma resistance of the photoresist layer to the etching container causes a decrease in the yield in the transport process and a decrease in the throughput due to the transport time.
- providing a vessel for improving the plasma resistance separately from the etching vessel not only requires extra space but also increases costs.
- an antireflection layer is inserted between the portion to be etched and the photoresist mask layer.
- a gas containing a substance having C and F such as a mixed gas of C 4 F 8 and O 2, a mixed gas of HBr, CF 4 and He, and a mixed gas of CH 2 F 2 and CF 4 It has been proposed to perform etching with a plasma of a mixed gas of He (Japanese Patent Laid-Open No. 10-26162).
- CF 4 mixed gas are also known with 0 2 (JP-A 7 3 0 7 3 2 8 JP).
- the anti-reflection layer and the mixed gas and CF 4 for CF 8 and O 2 ⁇ 2 In the case of etching with the plasma of the mixed gas of the above, the surface of the ArF photoresist layer is roughened, vertical stripes are formed in the ArF photoresist layer, and a considerable amount of the mask layer ArF photoresist layer is formed. In some cases, it will be etched and it will not be able to function as a mask.
- An object of the present invention is to provide a plasma processing capable of improving the etching resistance of an organic layer such as an ArF photoresist layer without lowering the yield or the throughput and without increasing the cost. It is to provide a method.
- Another object of the present invention is to provide a plasma processing method capable of performing plasma etching while improving the etching resistance of the organic layer.
- a plasma processing method capable of maintaining high plasma resistance of a mask layer such as an ArF photoresist layer or an F2 photoresist layer. It is to provide
- An object of the present invention is to provide a plasma processing method capable of etching a layer.
- a plasma processing method comprising:
- an object to be processed having an organic layer on its surface is prepared. And a step of irradiating the object with plasma of a processing gas containing H 2 and an inert gas to improve the plasma resistance of the organic layer.
- a plasma processing method comprising the steps of:
- an etching target portion, an antireflection layer covering the etching target portion, and an opening pattern covering the antireflection layer are formed.
- an etching target layer, an antireflection layer covering the etching target layer, and a mask layer covering the antireflection film layer and having an opening pattern are formed.
- Disposing a processing object having H 2 introducing a processing gas containing H 2 into the processing container, converting the processing gas into plasma, and using the plasma to pass through an opening pattern of the mask layer.
- an etching target layer and a mask layer made of an ArF photoresist or an F2 photoresist in which an opening pattern covering the etching target layer is formed are provided. Placing an object to be processed on a mounting table, converting the CF 4 and H 2 into plasma, and etching the etching target layer halfway through an opening pattern of the mask layer; and an initial etching step. After the step, there is provided a plasma processing method having a main etching step of plasma-forming an etching gas containing a fluorocarbon and etching the etching target layer.
- an etching target layer, an antireflection layer covering the etching target layer, and a mask layer made of acrylic acid resin having an opening pattern covering the antireflection layer are formed.
- Place the object to be processed A step of mounting the platform, the CF 4 into plasma, open Ropata of the mask layer - a first etching step of etching the antireflection layer through down, the CF 4 and H 2 into plasma, opening of the mask layer
- a plasma treatment method comprising the steps of:
- an object to be processed having a layer to be etched and a mask layer having an opening formed over the layer to be etched is mounted on a susceptor disposed in a processing container. Placing a processing gas containing H 2 into the processing container; and, in the susceptor, a high-frequency power having a frequency of 100 MHz or more, and a high-frequency power having a frequency of 3 MHz or more.
- a plasma processing method comprising: a supplying step; and a step of reducing a pressure in the processing container to 13.3 Pa (IOOmTorr) or less.
- an object having an etching target portion and a photoresist layer made of an ArF photoresist or an F2 photoresist, on which an opening pattern covering the etching target portion is formed.
- Disposing a processing body in a processing container converting a processing gas containing a substance having N into the processing container into plasma; and irradiating the photoresist layer with the processing gas; converting an etching gas into plasma within the processing container; Etching the target portion through the opening pattern.
- an ArF photoresist or an F2 photoresist on which an etching target portion, an antireflection layer covering the etching target portion, and an opening pattern covering the antireflection layer are formed.
- a plasma processing method comprising: a process; and a second etching process of converting the etching gas into plasma in the processing chamber and etching the etching target portion through the opening pattern.
- an object to be processed having an etching target layer and an organic mask layer having an opening pattern covering the etching target layer is formed of a component having an exposed portion of a substance containing Si.
- an object to be processed including a target layer to be etched, an organic film covering the target layer to be etched, and an organic mask layer having an opening pattern covering the organic film is referred to as Si.
- a processing vessel having a component having an exposed portion of the substance to be contained, introducing an etching gas into the processing vessel, plasma-forming the etching gas, and forming an opening pattern of the organic mask layer.
- an object to be processed including a target layer to be etched, an organic film covering the target layer to be etched, and an organic mask layer having an opening pattern covering the organic film is referred to as Si.
- a processing vessel provided with a component which comprises the steps of introducing and H 2 into the processing chamber, the introduced H 2 into plasma, the organic through opening Ropata Ichin of the organic mask layer Providing a plasma processing method having a step of etching a film.
- an etching target layer, and a photoresist layer made of an ArF photoresist or an F2 photoresist having an opening pattern covering the etching target layer are provided. Disposing a processing object having a process object in a processing container; introducing a processing gas containing C 2 F 4 into a processing container accommodating the processing object; and converting the processing gas into a plasma. Etching the layer to be etched in the object to be processed through the opening pattern of the photoresist layer with the plasma of the processing gas.
- a step of arranging an object to be processed having a layer to be etched and a mask layer having an opening pattern covering the layer to be etched in a processing container A step of introducing a processing gas containing C 2 F 4 and O 2 into a processing vessel containing the processing body, a step of plasma-treating the processing gas, and Etching the layer to be etched through the opening pattern of the mask layer.
- an A 1 -F photoresist or an F 1 -F photoresist formed with an etching target portion, an antireflection layer covering the etching target portion, and an opening pattern covering the antireflection layer is formed.
- an object to be processed including an etching target portion, an antireflection layer covering the etching target portion, and a mask layer formed with an opening pattern covering the antireflection layer is provided.
- an object to be processed comprising: an etching target portion; an antireflection layer covering the etching target portion; and a mask layer having an opening pattern covering the antireflection layer.
- Disposing a substance having C and F in the processing vessel a substance having C, H and F, and having a ratio of the number of H atoms to the number of F atoms of 3 or more in the processing vessel.
- a plasma processing method is provided, which comprises a step of plasma-forming an etching gas containing, etching the antireflection layer through the opening pattern, and etching the target portion.
- a portion to be etched and a photoresist layer made of an ArF photoresist or an F2 photoresist on which an opening pattern covering the portion to be etched is formed.
- a portion to be etched and this etch An object to be processed having an anti-reflection layer covering an object to be coated and a photoresist layer made of an ArF photoresist or an F2 photoresist having an opening pattern formed to cover the anti-reflection layer is placed in a processing container.
- a plasma processing method comprising: a step of forming a second etching gas into a plasma in the processing container; and etching the target portion to be etched through the opening pattern using the plasma.
- an object to be processed having a target portion to be etched, an antireflection layer covering the target portion to be etched, and a mask layer having an opening pattern covering the antireflection layer is formed in a processing container.
- a first etching gas containing CF 4 and C ⁇ in the processing vessel, and the plasma is used to etch the anti-reflection layer via the open pattern.
- a plasma processing method is provided, comprising: an etching step; and a second etching step of converting a second etching gas into plasma in the processing container and etching the etching target portion by the plasma through the open pattern.
- an ArF photoresist or an ArF photoresist formed with an etching target layer, an organic antireflection layer covering the etching target layer, and an opening pattern covering the organic antireflection layer is formed. Disposing a workpiece having a photoresist layer made of F2 photoresist in a processing container, introducing an etching gas having a substance containing Si into the processing container, and And plasma etching the organic anti-reflection layer through the opening pattern of the photoresist layer.
- an object to be processed having a layer to be etched and a mask layer having an opening formed by covering the layer to be etched is placed on a susceptor in a processing vessel.
- an object to be processed having a layer to be etched and a mask layer covering the layer to be etched and having an open pattern formed in a susceptor in a processing container.
- Mounting forming a Si-containing layer on the mask layer surface in the processing container, introducing an etching gas into the processing container, and converting the etching gas into plasma; Etching the layer to be etched through the opening pattern of the mask layer with the plasma of the etching gas in a processing container.
- a process in which a member having at least a part of the surface of Si, a first electrode, and a second electrode facing the first electrode is provided inside.
- a processing method is provided.
- an ArF photoresist or an F2 photoresist in which an opening pattern is formed by covering an etching target layer and the etching target layer.
- Placing an object to be processed having a photo-resist layer consisting of: a step of introducing an etching gas containing a Si compound into the processing container; and a step of turning the etching gas into plasma.
- FIG. 1 is a cross-sectional view showing an example of a plasma processing apparatus capable of performing the plasma processing method of the present invention
- FIG. 2 is a cross-sectional view showing another example of a plasma processing apparatus capable of performing the plasma processing method of the present invention
- FIG. 3 is a cross-sectional view schematically illustrating an object to be processed used for carrying out the first embodiment of the present invention
- FIGS. 4A and 4B are cross-sectional views schematically showing states of an object to be processed used for carrying out the second embodiment of the present invention in the order of steps,
- FIGS. 5A and 5B are cross-sectional views schematically showing a state of an object to be processed used for implementing the third embodiment of the present invention in the order of steps,
- FIGS. 6A, 6B, and 6C are cross-sectional views schematically illustrating states of a processing target used for implementing the fourth embodiment of the present invention in the order of steps.
- FIGS. 7A, 7B, and 7C are cross-sectional views schematically showing states of an object to be processed used in implementing the fifth embodiment of the present invention in the order of steps,
- FIG. 8 is a flow chart showing a series of steps of the fifth embodiment of the present invention
- FIGS. 9A, 9B, and 9C are diagrams for explaining a modified example of the fifth embodiment of the present invention. Sectional view schematically showing the state of the processing body in the order of steps,
- FIG. 10 is a flowchart showing a series of steps in a modification of the fifth embodiment of the present invention.
- FIGS. 11A and 11B are charts showing the effect of the plasma processing in the example of the fifth embodiment of the present invention.
- FIG. 12 is a cross-sectional view schematically showing an object to be processed used in the sixth embodiment of the present invention.
- FIGS. 13A and 13B are cross-sectional views schematically showing the state of an object to be processed used in implementing the seventh embodiment of the present invention in the order of steps,
- FIGS. 14A and 14B are cross-sectional views schematically showing the state of an object to be processed used in implementing the eighth embodiment of the present invention in the order of steps,
- FIG. 15 is a cross-sectional view schematically showing an object to be processed used in the ninth embodiment of the present invention.
- FIGS. 16A and 16B are cross-sectional views schematically showing the state of a processing object used for implementing the tenth embodiment of the present invention in the order of steps.
- FIG. 1 is a cross-sectional view showing an example of a plasma processing apparatus capable of performing the plasma processing method of the present invention.
- This plasma processing apparatus 1 has a processing container 2.
- the processing container 2 is made of metal, for example, aluminum whose surface is oxidized, and is grounded for safety.
- the bottom of the processing vessel 2 is parallel
- a susceptor 5 functioning as a lower electrode of the plate electrode is provided.
- the susceptor 5 is connected to a high-pass filter (HPF) 6, and further connected to a second high-frequency power supply 50 via a matching unit 51.
- An electrostatic chuck 11 is provided on the susceptor 5, and a workpiece W such as a semiconductor wafer is mounted thereon.
- the electrostatic chuck 11 has a configuration in which an electrode 12 is interposed between insulators. By applying a DC voltage from a DC power supply 13 connected to the electrode 12, the workpiece W Is electrostatically adsorbed.
- a focus ring 15 composed of an alumina, Si, Si 2, or the like is arranged so as to surround the object W to improve the uniformity of etching.
- the upper electrode plate 24 and the support body 25 constitute an upper electrode 21 of a parallel plate electrode facing the susceptor 5.
- a low-pass filter 42 is connected to the upper electrode 21, and a first high-frequency power supply 40 is connected via a matching device 41.
- a gas inlet 26 is provided at the center of the upper surface of the upper electrode 21, and a gas supply pipe 27 is connected to the gas inlet 26. From the side 26, a valve 28, a mass flow controller 29, and a processing gas supply source 30 are connected. A predetermined processing gas is supplied from the processing gas supply source 30.
- an exhaust pipe 31 is connected to the bottom of the processing container 2, and an exhaust device 35 is connected to the exhaust pipe 31. Further, a gate pulp 32 is provided on a side wall of the processing container 2 so that the object to be processed W is transferred to and from an adjacent load lock chamber (not shown).
- the gate valve 32 is opened. Then, the object to be processed W is carried into the processing container 2 and placed on the electrostatic chuck 11. Next, the gate valve 32 is closed, the inside of the processing vessel 2 is depressurized by the exhaust device 35, and then the valve 28 is opened, and a predetermined processing gas is supplied from the etching gas supply source 30 and the pressure in the processing vessel 2 is increased. Is a predetermined value. In this state, high-frequency power is supplied from the first and second high-frequency power supplies 40 and 50 to convert the processing gas into plasma, and a plasma process is performed on a predetermined film of the workpiece W (plasma resistance improving process or plasma etching). Is carried out.
- a DC voltage is applied to the electrode 12 in the electrostatic chuck 11 before and after the timing when the high-frequency power is supplied from the first and second high-frequency power sources 40 and 50, and the object to be processed W Is electrostatically attracted onto the electrostatic chuck 11 and a predetermined plasma process is performed in this state.
- FIG. 2 is a sectional view showing another example of the plasma processing apparatus in which the present invention is implemented.
- This plasma etching apparatus 61 has a processing vessel 62.
- the processing container 62 has a stepped cylindrical shape composed of a small-diameter upper portion 62a and a large-diameter lower portion 62b, and is formed of metal, for example, aluminum whose surface is oxidized and grounded.
- a conductive material functioning as a lower electrode of the parallel plate electrode, for example, a susceptor 65 made of oxidized aluminum on the surface is provided at the bottom of the processing container 62 via an insulator 63.
- An electrostatic chuck 71 is provided on the susceptor 65, and a workpiece W such as a semiconductor wafer is mounted thereon.
- the electrostatic chuck 71 has a configuration in which an electrode 72 is interposed between insulators. By applying a DC power supply 73 connected to the electrode 72, the workpiece W is electrostatically attracted. I do. Then, and be disposed focus ring 7 5 consisting of S i and S I_ ⁇ 2, etc., to improve the uniformity of etching so as to surround the object to be processed W. Above the susceptor 65, an upper electrode plate 81 made of a short-headed Si or the like is supported by the upper portion 62a of the processing vessel 62 so as to face the susceptor 65. It is provided.
- the processing container 62 also functions as a parallel plate type electrode facing the susceptor.
- a multipole ring magnet 82 is rotatably provided around the upper portion 62 a of the processing container 62.
- a gas inlet 86 is provided at the center of the upper surface of the processing vessel 62, and a gas supply pipe 87 is connected to the gas inlet 86, and a gas inlet is connected to the gas supply pipe 87.
- a valve 88, a masochist controller 89, and a processing gas supply source 90 are connected.
- a predetermined processing gas is supplied from the processing gas supply source 90.
- an exhaust pipe 91 is connected to the bottom of the processing container 62, and an exhaust device 95 is connected to the exhaust pipe 91.
- a gate valve (not shown) is provided on a side wall of the processing container 62, so that the object to be processed W is conveyed between an adjacent load lock chamber (not shown). ing.
- a first frequency power supply 101 and a second high frequency power supply 102 are connected to a susceptor 65 serving as a lower electrode via a matching device 100.
- the frequencies of the first and second high-frequency power supplies 101 and 102 are, for example, 100 MHz and 3.2 MHz, respectively.
- the gate valve (not shown) is opened, the object to be processed W is carried into the processing container 62, and is placed on the electrostatic chuck 71.
- the valve 88 is opened, and a predetermined processing gas is supplied from the etching gas supply source 90 to the processing vessel 62.
- the inside pressure is set to a predetermined value.
- high-frequency power is supplied from the first and second high-frequency power supplies 101 and 102 to convert the processing gas into plasma, and the plasma on the predetermined film of the workpiece W is blown.
- Perform a plasma treatment plasma resistance improvement treatment or plasma etching.
- a DC voltage is applied to the electrode 72 in the electrostatic chuck ⁇ 1 before and after the timing of supplying high-frequency power from the first and second high-frequency power supplies 101 and 102,
- the object to be processed W is electrostatically attracted onto the electrostatic chuck 71, and a predetermined plasma process is performed in this state.
- an SiO 2 film 121 as an etching target layer and an ArF photoresist or F (2) a step of irradiating the object to be processed W having a photoresist layer 122 composed of a photoresist with plasma to improve the plasma resistance of the photoresist layer 122; And a step of plasma-etching the etching target layer 1 2 1 using 2 as a mask.
- an alicyclic-containing acryl resin As the ArF photoresist or the F2 photoresist, an alicyclic-containing acryl resin, a cycloolefin resin, a cycloolefin-maleic anhydride resin, a methyl acrylate resin, or the like can be used.
- the gate valve 32 is opened, and the object to be processed W is carried into the processing container 2 and placed on the electrostatic chuck 11.
- the gate valve 32 is closed, the inside of the processing vessel 2 is depressurized by the exhaust device 35, and then the valve 28 is opened to supply the processing gas, for example, H 2 from the processing gas supply source 30, and the processing volume is reduced.
- the pressure in the vessel 2 is set to a predetermined value, preferably 13.3 Pa (100 mT orr) or less, for example, 6.7 Pa (5 OmT orr).
- high frequency power is applied to the upper electrode 21 and the susceptor 5 serving as the lower electrode, and the processing gas is turned into plasma to irradiate the photoresist layer 122 in the workpiece W with plasma.
- a DC power supply 13 is applied to the electrode 12 in the electrostatic chuck 11 to electrostatically hold the workpiece W on the electrostatic chuck 11.
- the H materials having H 2 and He, Ne, A r, K r, plasma or process gas containing an inert gas, such as Xe, up substances having other H plasma
- the H plasma of a processing gas containing and a substance such as an inert gas may be irradiated.
- a substance having H for example, NH 3 can be mentioned. Irradiation of these gases improves the plasma resistance of the photoresist layer 122 which is an organic layer.
- the plasma containing H promotes the cross-linking reaction of the photoresist layer 122, which is an organic layer, and the C-0 bond and C--H bond change to C--C bond.
- NH 3 is also a substance having N, but may contain another substance having N, for example, N 2 as a processing gas.
- N 2 also has the advantage of easy handling.
- the use of a substance containing N as the processing gas also improves the plasma resistance of the photoresist layer 122, so that a substance containing N may be used without using a substance containing H.
- N and C in the ArF photoresist combine to form a CN-based protective film on the surface of the ArF photoresist, and the ArF It is thought that the plasma resistance of the photoresist is improved.
- the processing gas contains a substance having N such as N 2, it is preferable that the processing gas further contains a substance having H. This is because the presence of H is thought to promote the bond between N and C.
- the substance having H one or more selected from H 2 , CHF 3 , CH 2 F 2 , and CH 3 F can be used.
- the pressure inside the processing container 2 is set to a predetermined value suitable for the etching step, for example, 2.0 Pa (15 mTorr), and an etching gas is supplied from the processing gas supply source 30.
- a gas containing fluorocarbon for example, a gas containing C 5 F 8 is preferable. Specific examples may be mentioned C 5 F 8 + 0 2 + A r.
- C 5 F 8 linear C 5 F 8 having a higher selectivity is preferred, and among them, 1,1,1,4,4,4,5,5,5-octafluorool 2-pentyne (hereinafter referred to as “2_C 5 to as F 8 ".) in case of using, the selection ratio becomes extremely large.
- a gas containing C 4 F 6 is also suitable as an etching gas.
- a predetermined emission intensity is detected by an end point detector (not shown), and the etching is terminated based on this.
- the etching target portion is not limited to the S I_ ⁇ 2 film, TEO S, BP SG, PSG, SOG, thermal oxide film, HTO, FSG, organic acid It can be applied to the etching of oxide films (oxygen compounds) such as silicon oxide films, CORAL (Novelas), and low dielectric organic insulating films.
- oxide films oxygen compounds
- CORAL Novelas
- a gas obtained by simply adding another gas to the processing gas can be used as the etching gas. If etching can be performed only by adding another gas after the process of irradiating the plasma of the processing gas, the process of irradiating the plasma of the processing gas and the process of etching while maintaining the plasma discharge can be performed. Can be performed continuously.
- H 2 is used as a processing gas, and then, a mixed gas of H 2 , CF 4, and Ar is used as an etching gas.
- a mixed gas of H 2 , CF 4, and Ar is used as an etching gas. The step of etching the oxide film may be performed.
- photoresist materials having low plasma resistance such as ArF photoresist and F2 photoresist
- other organic photoresist layers may be used instead of these materials. It may be another organic layer.
- the configuration of the plasma processing apparatus is not limited to that shown in FIG.
- the process chamber pressure 6. and 7 P a 5 OmTo rr
- the processing gas of H 2 flow rate 0. 05 ⁇ 0. 2 L / min The irradiation time was 30 seconds, high frequency power of a frequency of 60 MHz was applied at a power of 500 to 1,000 W to the upper electrode, and no high frequency power was applied to the lower electrode.
- the process chamber pressure 2. a 0 P a (15mT orr) the etching gas C 5 F 8, Ar, 0 0.
- An anti-reflection film 132 is etched through the pattern opening of the photoresist layer 133 on the workpiece W having a photoresist layer 133 made of ArF photoresist or F2 photoresist covering the 132.
- a first etching step (FIG. 4A) for improving the plasma resistance of the resist layer 133, and a second etching step for plasma etching the Si S2 film 131 through the photoresist layer 133 after this step (Figure 4B).
- the object to be processed W is loaded and arranged in the processing container 2, and a processing gas serving as a first etching gas, for example, N 2 and H 2 is supplied from the processing gas supply source 30, and
- the pressure is set to a predetermined value, for example, 107 Pa (80 OmT orr).
- the pressure in the processing vessel at this time is preferably 107 160 Pa (800 1200 mTorr). If it is lower than 107 Pa, the photoresist layer 133, especially the shoulder of the pattern opening is also etched. This is because if it is larger than 160 Pa, the etching of the opening does not proceed.
- a gas containing N for example, N 2 or NH 3 can be used.
- a gas containing H for example, H 2 , CHF 3 , CH 2 F 2 , CH 2 it is possible to use one or more selected from among 3 F.
- the first etching gas is plasmanized, and the antireflection film 132 is etched using the photoresist layer 133 as a mask.
- the antireflection film amorphous carbon or an organic polymer material can be used. This etching also serves as a process for improving the plasma resistance of the photoresist layer 133 at the same time.
- the first etching is completed when etching is performed for a predetermined time.
- the processing gas and the etching gas By making the processing gas and the etching gas the same, gas switching between the step of irradiating the plasma to the photo resist layer 133 and the step of etching the antireflection layer 132 becomes unnecessary, and the processing can be performed in a short time. And the throughput can be improved. In addition, since the plasma resistance of the ArF photoresist can be improved during the etching of the antireflection layer 132, no extra device or space is required.
- the processing gas (first etching gas) is switched to an etching gas (second etching gas), and the second etching for plasma-etching the SiO 2 film 131 through the photoresist 133 is performed similarly to the first etching.
- etching gas As the etching gas at this time, as in the first embodiment, a gas containing fluorocarbon, for example, a gas containing C 5 F 8 is preferable. Specific examples (: 5 8 + ⁇ 2 + (: 0 + eight can be exemplified.
- C 5 F 8 linear C 5 F 8 is preferred, and 2-C 5 F 8 is particularly preferred.
- C 4 F 6 is also suitable as the fluorocarbon used for the etching gas.
- the portion to be etched is SiO 2
- the film is not limited to two films, but may be an oxide film (oxygen compound) such as TEOS, BPSG, PSG, SOG, thermal oxide film, HTO, FSG, organic oxidized Si film, CORAL (Novelas), etc. It is applicable to etching of dielectric organic insulating films and the like.
- the plasma processing apparatus is not limited to that shown in FIG. Next, an example of the method according to the second embodiment will be described.
- the pressure inside the processing vessel is set to 107 Pa (800 mTorr), and the flow rates of the processing gases (first etching gas) N 2 and H 2 are each set to 0.6 LZm in.
- the etching gas is 1, 2, 3, 3, 4, 4, 5, 5 fluor-cyclo-1-pentene (hereinafter referred to as “(: —C 5 F 8 ”). to.) in the case of a gas (example 2 1) containing the processing container pressure 2.
- a 0 P a (1 5mTo rr) Etsu Chingugasu c one C 5 F 8, Ar, 0 2 flow rate Are 0.015 LZm in (15 sccm), 0.38 L / min (380 sccm), and 0.019 L / min (19 sccm), respectively.
- the case of the etching gas is a gas containing 2-C 5 F 8 (example 2-2), the processing container the inner pressure 2. and 7 P a (2 OmTo rr) , the etching gas 2- C 5 F 8, a r , 0 2, the flow rate of CO, respectively it 0.
- the plasma resistance of the ArF photoresist film was improved by using the plasma of the mixed gas of N 2 and H 2 , subsequent S I_ ⁇ 2 film in the second etching step of etching ring, selectivity to a r F photoresist film S i 0 2 film (S i 0 2 etch rate / a r F photoresist etch rate) was confirmed to be higher.
- an alicyclic group-containing acrylic resin, a cycloolefin resin, and a cyclodextrin-lein-maleic anhydride resin can be used.
- an organic polymer material or amorphous carbon can be used.
- a gate valve (not shown) is opened, and the object to be processed W is carried into the processing container 62 and placed on the electrostatic chuck 71.
- the gate valve is closed, the inside of the processing vessel 62 is depressurized by the exhaust device 95, and then the valve 88 is opened, and a processing gas, for example, H 2 is supplied from the processing gas supply source 90.
- the pressure in 2 is set to a predetermined value.
- the processing gas may be only H 2 , or a diluent gas such as Ar may be added, for example, at the same flow rate as H 2 .
- another H-containing substance may be used as the processing gas.
- the plasma treatment is performed for a predetermined time to improve the plasma resistance of the photoresist layer 144 and to etch the anti-reflection layer 142.
- the photoresist layer 144 as the mask layer is irradiated with the plasma of the processing gas containing H at such a low pressure, the surface thereof is modified and the plasma resistance of the mask layer is improved.
- the target layer is then etched by plasma etching through the opening pattern 144a of the photoresist layer 144.
- the selectivity with respect to the mask layer that is, the etching rate of the layer to be etched / the etching rate of the mask layer can be increased.
- H radicals act on the surface of the photoresist layer 144 to cause CH 4 from within the photoresist layer.
- the processing gas does not include a substance having N. If the processing gas contains a substance containing N, it is considered that the sidewall surface of the mask layer is covered with a protective film containing C and N as a main component, which has an effect of improving plasma resistance. This is because H radicals cannot penetrate from the side wall surface to the inside, and the plasma resistance of the side wall surface of the mask layer cannot be improved over a wide width.
- the processing pressure is preferably 8 to 3 O mT or 1 ⁇ from the viewpoint of further reducing the damage to the photoresist layer 144 in the processing.
- the high-frequency power for plasma formation is supplied from the first high-frequency power supply 101 to the susceptor 65, the plasma resistance of the photoresist layer 144, which is a mask layer, is also improved. .
- the frequency at this time is 100 MHz The above is preferred.
- the susceptor 65 is supplied with another high-frequency power from the second high-frequency power supply 102, preferably with a frequency of 3 MHz or more, from the second high-frequency power supply 102, so that active species in the plasma, particularly ions Can be controlled.
- This other high frequency power is preferably 100 W or less. This is because by performing the treatment in an atmosphere of low pressure and low power (low bias), damage to the photoresist layer 144, which is a mask layer, can be minimized.
- H radicals penetrate from the sidewalls of the photoresist layer 144 to the inside, so that a thick portion from the sidewall surface of the photoresist layer 144 to the inside may be formed.
- the plasma resistance can be improved. This is because the photoresist layer 144 is an organic material and contains carbon, so that such a surface modification action is remarkable.
- the plasma resistance of the ArF photoresist and F2 photoresist constituting the photoresist layer 144 changes considerably before and after the plasma resistance improvement treatment. The effect is enormous when applied.
- the anti-reflection layer 144 necessary for etching the layer to be etched is etched at the same time as the plasma resistance improving treatment, so that the photoresist layer 144 as a mask layer is almost etched.
- the antireflection layer 144 can be etched without the need.
- H2 in the processing vessel 62 is dissociated into various active species, and among the active species,
- H radicals mainly contribute to the improvement of the plasma resistance of the photoresist layer 1443 serving as a mask layer
- H radicals and ions mainly contribute to the etching of the antireflection layer 142. Since the contribution balance of these active species is excellent, the anti-reflection layer 142 can be effectively etched at the same time as the plasma resistance of the photoresist layer 144 as a mask layer is improved.
- the second high-frequency power supply 102 The movement of ions in this active species can be controlled by supplying high-frequency power from a high-frequency power supply with a frequency of 3 MHz or more.
- one carbon such as a mixed gas of the etching gas, for example C 4 F 6 and 0 2 and A r to E T suchingu the S I_ ⁇ 2 film 141 is etched layer the process gas gas supply, by applying a high frequency power was bra Zuma of the process gas from the first and second high-frequency power to the susceptor evening 65, the S I_ ⁇ 2 film 141 and photoresist layer 143 as a mask by the plasma Etch.
- a predetermined emission intensity is detected by an end point detector (not shown), and the etching is terminated based on this.
- the etching target portion is not limited to the SiO 2 film, but may be TE ⁇ S, BPSG, PSG, S ⁇ G, thermal oxide film, HT ⁇ , FSG, organic oxide film. It is applicable to etching of oxide films (oxygen compounds) such as Si film, CORAL (Novelas) and low dielectric organic insulating films. Further, it is not limited to a photoresist material having low plasma resistance, such as an ArF photoresist or an F2 photoresist, but may be another organic photoresist layer. It may be a layer.
- the configuration of the plasma processing apparatus is not limited to that shown in FIG.
- the chamber internal pressure is set to 1.07 Pa (8.OmTorr), 4.00 Pa (3 OmT orr), and 13.3 Pa (10 OmT orr).
- H 2 was supplied as a processing gas from a processing gas supply source.
- the frequencies of the first and second high frequency power supplies were 100 MHz and 3.2 MHz, respectively, and the power was 2400 W and 500 W, respectively.
- no power was supplied from the second high frequency power supply 0 W was also evaluated.
- the evaluation was performed by observing the cross-sectional state of the mask layer with a microscope (SEM).
- SEM microscope
- the mask layer had less streak, groove, and enlargement of the opening at 0 W than at 500 W.
- the power supplied from the second high-frequency power supply is preferably 100 W or less.
- the pressure 1. 0 7 P a is fixed to (8. 0 mT orr), the flow rate of H 2 50mL / min (sc cm ), l O OmL / min (sc cm), 1 20 mL / ⁇ In (sc cm) and 200 mL / min (sccm), when the flow rate was small, there was less streaking into the mask layer and the expansion of the opening was smaller.
- an alicyclic group-containing acrylic resin, a cycloolefin resin, and a cyclodextrin olefin monomaleic anhydride resin can be used.
- an organic polymer material or amorphous carbon can be used.
- such an etching step is a first etching step in which the antireflection film 152 is plasma-etched through the opening pattern 153a of the photoresist layer 1553, and a photoresist layer 15 a second E Tsuchingu etching the S I_ ⁇ two layers 1 5 1 partway through apertures patterns 3, 3 of the third etching step of further etching the S i 0 2-layer 1 5 1 after the second etching step Perform in stages.
- Second etching step of these are carried out as the initial step of etching the S I_ ⁇ two layers 1 5
- third etching step is carried out as a main etch process of S I_ ⁇ two layers 1 5 1.
- the gate pulp 32 is opened, the object to be processed W is carried into the processing container 2 and placed on the electrostatic chuck 11.
- the gate valve 32 is closed and the inside of the processing vessel 2 is depressurized by the exhaust device 35, and then the valve 28 is opened, H 2 is supplied from the etching gas supply source 30 and the pressure in the processing vessel 2 is increased.
- the force is set to a predetermined value.
- the second high-frequency power supply 4 0, 5 0 to a high frequency power supplies, reflected back through the open Ropata Ichin of full photoresists layer 1 5 3 to act on the workpiece W by plasma of H 2 Etch barrier layer 152 (first etch; FIG. 6A).
- a DC power supply 13 is applied to the electrode 12 in the electrostatic chuck 11 to obtain a workpiece W Is electrostatically attracted onto the electrostatic chuck 11.
- a predetermined emission intensity is detected by an end point detector (not shown), and based on this, the supply of high frequency power is stopped and the first etching step is completed.
- a mixed gas of CF 4 and H 2 is supplied into the same processing container or another processing container in the same manner as in the first etching step, and the Si ⁇ 2 layer is passed through the photoresist layer 15 3 opening pattern.
- Part 1 is etched partway (second etching step; FIG. 6B).
- a predetermined etching time for example, 60 seconds
- different gas for example, supplying a mixed gas of linear C 5 F 8 and ⁇ 2 and A r is the second E etching process in the same manner as in the second etching step in the same process vessel or another processing vessel
- the SiO 2 layer 15 1 is further etched (third etching step; FIG. 6C).
- the third etching step is completed based on the detection of the end point.
- the S i 0 2-layer 1 5 1 of a second etching process using a plasma of CF 4 and H 2 to A r F photoresist layer 1 5 3 surface is a mask layer, in particular S i 0
- the protective film is formed more near the boundary between the two layers 151 and the deformation of the shape of the photoresist layer 153 can be suppressed in the subsequent third etching step.
- the anti-reflection layer 152 is etched using H 2 plasma, so that the shape of the photoresist layer 153 in the third etching step is reduced. Deformation can be suppressed more effectively. This is probably because the oxygen atoms from the vicinity of the surface of the photoresist layer 1 5 3 a mask layer Ri by the plasma of H 2 is coupled between a strong carbon structurally desorbed is formed.
- the effect of suppressing the deformation of the photoresist layer 153 by the plasma due to such a plasma is that the material is particularly easily deformed by the plasma (methacrylic acid resin is a resin in which methacrylic acid is incorporated in the structure). In this case, the effect is remarkable, but the same effect can be obtained with other resins such as an acrylic acid resin (a resin having acrylic acid incorporated in the structure).
- an acrylic acid resin a resin having acrylic acid incorporated in the structure.
- the etching rate is higher than H 2
- the anti-reflection layer 15 2 can be etched at high speed by using CF 4 plasma, which has the least damage to the mask layer among fluorocarbons. it can.
- CF 4 plasma which has the least damage to the mask layer among fluorocarbons. it can.
- a gas containing linear C 5 F 8 and ⁇ 2 as an etching gas in the third etching step
- the Si S 2 layer 151 which is the layer to be etched, is more anisotropic and more Can be etched quickly.
- the etching gas in the third etching step is not limited to this, but is preferably a gas different from the mixed gas of CF 4 and H 2 used in the second etching step.
- an etching gas containing fluorocarbon is preferably used. More preferably, the above-mentioned gas containing linear C 5 F 8 and ⁇ 2 is turned into plasma, and the main etching step of etching the remaining portion of the Si ⁇ 2 layer to be etched may be performed.
- the above-mentioned gas containing linear C 5 F 8 and ⁇ 2 is turned into plasma, and the main etching step of etching the remaining portion of the Si ⁇ 2 layer to be etched may be performed.
- a r F Fotore resist layer surface is many protective film formed by particular boundary vicinity between the S I_ ⁇ 2 layer is etched layer, A r F Photos in the subsequent main etch process Deformation of the shape of the resist layer can be suppressed.
- the etching target portion is not limited to the SiO 2 film, but may be TEOS, BPSG, PSG, SOG, thermal oxide film, HTO, FSG, organic oxide Si film. It can be applied to etching of oxide films (oxygen compounds) such as CORAL (Novelas) and low dielectric organic insulating films. Further, it is not limited to a photoresist material having low plasma resistance, such as an ArF photoresist or an F2 photoresist, but may be another organic photoresist layer. It may be.
- the configuration of the plasma processing apparatus is not limited to that shown in FIG. Next, an example based on the present embodiment will be described.
- the frequency of the first high-frequency power supply was set to 60 MHz
- the frequency of the second high-frequency power supply was set to 2 MHz.
- No.:! ⁇ 3 are those with A r F photoresist acrylic acid resin as a photoresist layer 1 53, both third Etsu quenching step the C 4 F 6 0 2 and and using the eight r, N o. 1 uses a CF 4 in the first etching step among them, those was not carried out a second etching step, the No.
- No. 4 to 6 are those with A r F photoresist methacrylic acid resin as a photoresist layer 153, any third Etsu quenching step with linear C 5 F 8 ⁇ 2 and the A r Among these, N 0.4 used CF 4 in the first etching step and did not perform the second etching step, and No. 5 used CF 4 in the first etching step, and 2 those using an etching process and CF 4 and H 2, No. 6 has with H 2 in the first etch ring step, also of a is using a CF 4 and H 2 in the second etching step.
- an etching target layer 16 1 such as a Si 2 layer formed on a base layer 160 such as Si as shown in FIG. (Example of thickness: 150 nm), an organic anti-reflection layer 16 2 covering this etching target layer 16 1 (Example of thickness: 60 nm), and this organic anti-reflection layer 16 2
- An object to be processed W having a photoresist layer 163 made of an ArF photoresist or an F2 photoresist on which an opening pattern 16 3 a (example diameter: 0.18 m) is formed.
- a step of plasma-etching the organic anti-reflection layer 162 through the opening pattern 163a of the photoresist layer 163, and a plasma etching of the layer 161 to be etched, followed by an opening pattern 161a Is performed.
- description will be made with reference to FIGS. 7A to 7C and a flowchart of FIG.
- Examples of the ArF photoresist and the F2 photoresist constituting the photoresist layer 163 include an alicyclic group-containing acrylic resin, a silicone resin, a cycloolefin-maleic anhydride resin, and a methacrylic acid resin. Can be used.
- An organic polymer material can be used as the organic anti-reflection layer 162.
- At least the surface of the upper electrode plate 24 of the plasma processing apparatus 1 is made of a material containing Si, such as single crystal Si and SiC.
- the gate valve 32 is opened, the object W is carried into the processing container 2 (STE P 1), and is placed on the electrostatic chuck 11.
- the gate valve 32 is closed, and the processing vessel 2 is opened by the exhaust device 35.
- the valve 28 is opened, H 2 gas is supplied from the processing gas supply source 30 (STEP 2), and the pressure in the processing container 2 is set to a predetermined value.
- the supply of the high-frequency power and the etching gas is stopped, and the etching of the organic antireflection layer 16 2 is completed (FIG. 7B).
- the emission intensity of a specific substance in the plasma may be detected by an end point detector (not shown), and the etching process may be terminated based on this.
- at least S i and H 2 plasma photoresist layer surface is supplied from the upper electrode plate 2 4 made S i By acting on the surface of 163, a thin protective layer 163b containing Si_ ⁇ and Si—C is formed on the surface of the photoresist layer 163.
- the organic antireflection layer 162 is plasma-etched through the open pattern 163a of the photoresist layer 163, a thin protective layer 163b is formed on the surface of the photoresist layer 163. Is formed, and the plasma resistance of the photoresist layer 163 can be improved without requiring another extra step. Therefore, the plasma resistance of the photoresist layer 163 can be maintained at a high level without causing surface roughness and striation when etching the organic antireflection layer 162.
- C 5 F 8 , ⁇ 2 and Ar are supplied as an etching gas (STEP 4), and the same procedure as the etching of the organic anti-reflection layer 16 2 is performed.
- the etching target layer 161 is plasma-etched through the opening pattern 163a of the photoresist layer 163 (STEP 5).
- an opening pattern 161a having a high aspect ratio is formed in the etching target layer 161 (FIG. 7C).
- the object to be processed W is taken out of the processing vessel 2 through the gate valve 32 (STEP 6).
- the protective layer 16 3 b is formed on the surface of the photoresist layer 16 3, so that a high plasma resistance state is obtained. Therefore, even in the plasma etching of the etching target layer 161, the plasma resistance of the photoresist layer 163 and the selectivity of the etching target layer 161 to the photoresist layer 163 are kept high. Therefore, the surface of the photoresist layer 163 does not have a rough surface or a vertical streak, and the etching target layer 161 has a high etching rate. For plasma etching. As a result, the throughput in the plasma etching step is improved in combination with the fact that another extra step is not required. Also, since no vertical streak occurs in the opening pattern 16 3 of the photoresist layer 16 3, the opening pattern 16 1 a formed in the etching target layer 16 1 using the photoresist layer 16 3 as a mask Accuracy is also improved.
- the photoresists layer 1 6 3 resistant plasma resistance from the viewpoint of improvement of the photoresists layer 1 6 3 resistant plasma resistance, it is possible to use 116, N 2 11 2 algebraic Wari.
- the organic antireflection layer 16 2 is hardly etched.
- the organic anti-reflection layer 162 may not be provided.
- the plasma resistance of the photoresist layer 163 is mainly improved by at least one type of plasma treatment of H 2 , He, and N 2. Processing can be performed.
- FIGS. 9A to 9C a modification of the present embodiment will be described with reference to FIGS. 9A to 9C and a flowchart of FIG.
- the organic anti-reflection layer 16 2 is etched with CF 4 gas plasma, and prior to etching of the etching target layer 16 1, the photoresist layer 16 3 is formed by plasma treatment with H 2 gas.
- a protective layer 16 3 b is formed on the surface of the substrate will be described.
- the gate valve 32 is opened, the workpiece W is carried into the processing vessel 2 (STE P 11), and placed on the electrostatic chuck 11.
- the gate valve 32 is closed, the inside of the processing vessel 2 is depressurized by the exhaust device 35, and then the valve 28 is opened to supply CF 4 gas from the processing gas supply source 30 (STEP). 1 2),
- the pressure in the processing container 2 is set to a predetermined value.
- the organic antireflection layer 1 6 2 is etched ring through the opening pattern of (S TE P 1 3) ( Figure 9 A).
- a DC voltage is applied to the electrode 12 in the electrostatic chuck 11 to be exposed.
- the processing object W is electrostatically attracted onto the electrostatic chuck 11. After the etching for a predetermined time, the supply of the high-frequency power and the etching gas is stopped, and the etching of the organic antireflection layer 16 is completed.
- the emission intensity of a specific substance in the plasma may be detected by a final inspection device (not shown), and the etching process may be terminated based on the detected intensity.
- the gas supplied to the processing vessel 2 is switched to H 2 gas (STEP 14), the H 2 gas is turned into plasma, and the H 2 plasma and Si supplied from the upper electrode plate 24 are photo-photographed.
- a thin protective layer 163b containing Si—O, Si—C, etc. is formed on the surface of the photoresist layer 163 (S TE P 15) (FIG. 9B).
- the opening pattern 16 3 of the photoresist layer 16 3 is formed in the same procedure as the etching of the organic anti-reflection layer 16 2.
- Plasma-etch the target layer 16 1 through a step 1 '7).
- an opening pattern 161a having a high aspect ratio is formed (FIG. 9C).
- the processing object W is taken out of the processing container 2 through the gate valve 32 (STEP 18).
- the protective layer 16 3 b is formed on the surface of the photoresist layer 16 3.
- the film has high plasma resistance, so that the plasma resistance of the photoresist layer 163 and the etching selectivity to the mask are kept high.
- the opening pattern 161a can be formed by plasma etching under the condition of a high etching rate without causing the photoresist layer 163 to have a rough surface or a vertical streak. As a result, the throughput in the plasma etching step is improved in combination with the fact that no extra step is required.
- the etching target layer 1 6 1 is not limited to the S i oxides represented by S i 0 2 which illustrated, S i nitride compound, other S i compounds such as S i carbide, single crystal S 1, polycrystalline S i, Organic materials, organic-inorganic hybrid materials, metals, metal compounds, etc. are applicable.
- a photoresist having low plasma resistance such as the exemplified ArF photoresist II F2 photoresist, is used.
- the present invention is not limited to this, and other organic photoresist layers such as an EB resist that performs lithography using an electron beam, an EUV resist that performs lithography using vacuum ultraviolet rays, and a KrF resist are also used. The above effect can be obtained. Further, the present invention is not limited to the photoresist layer, and may be another mask layer. Further, the configuration of the plasma processing apparatus is not limited to that shown in FIG.
- the upper electrode plate was used as the Si source when forming the protective layer, the present invention is not limited to this, and at least the surface of the components inside the processing vessel, such as the focus ring, the shield ring, By including i, it can be used as a similar Si source.
- the upper electrode plate is provided so as to face the object, there is an advantage that the treatment for improving the plasma resistance can be uniformly performed in the plane of the object, which is preferable.
- the frequencies of the first high-frequency power supply 40 and the second high-frequency power supply 50 in each of the following Examples and Comparative Examples were 60 MHz and 13.56 MHz, respectively.
- Processing vessel pressure 2.0 Pa (15 mT orr)
- High frequency power from the first high frequency power supply 2200 W
- High frequency power from the second high frequency power supply 100 W
- Processing vessel pressure 2.0 Pa (15 mT orr)
- High frequency power from the first high frequency power supply 2200 W
- Processing vessel pressure 2.0 Pa (15 mT orr)
- High frequency power from the first high frequency power supply 2200 W
- High frequency power from the second high frequency power supply 100 W
- He is 0. l LZm inn (l O O s c cm)
- High frequency power from the first high frequency power supply 2200 W
- High frequency power from the second high frequency power supply 100 W
- FIG. 1 A and FIG. 1 1 B respectively that put the Akuriru system and Metaku Lil based photoresists layer using A r F photoresist Bok of surface analysis result immediately after plasma treatment (H 2, N 2, H e, a diagram respectively indicated by Ar).
- H 2, N 2, H e a diagram respectively indicated by Ar.
- acrylic and methacrylic In any of the ArF photoresists described above, the bonding energy corresponding to Si 1 O, Si 1 C, etc. is applied to the surface of the photoresist layer by the plasma treatment using H 2 , N 2 , and He plasmas. It was observed that there was a protective layer containing the substance having.
- the adhesion of Si to the photoresist layer surface also improves plasma resistance, but in this case, there may be inconvenience that Si attaches to holes near the layer to be etched after asshing. . From this point, it was confirmed that H 2 , N 2 , and He should be used for the plasma treatment.
- An object to be processed W having an etching target layer, an organic anti-reflection layer covering the etching target layer, and a photoresist layer having an opening pattern formed to cover the organic anti-reflection layer is processed under the following conditions. Then, the photoresist layer 163 was subjected to a plasma treatment under the same conditions as in Examples 5-1 to 5-3 and Comparative Example 5-11 (FIGS. 9A and 9B, STE in FIG. 10). P 11 to 15).
- Processing vessel pressure 6.7 Pa (50 mT or r)
- High frequency power from the first high frequency power supply 100 W
- Etching gas and its flow rate CF 4 0.1 LZm in (100 sccm)
- the layer 16 1 to be etched was etched under the following conditions (FIG. 9C, STEP 16 to 18 in FIG. 5).
- Processing vessel pressure 2.0 Pa (15 mT orr)
- High-frequency power from the first high-frequency power supply 2170 W
- High frequency power from the second high frequency power supply 1550 W
- the photoresist layer 163 is formed before the etching of the organic anti-reflection layer and the layer to be etched.
- the surface roughness and vertical streak of the ArF photoresist layer after the etching of the layer to be etched were less than in the case of performing the plasma treatment.
- E etching rate is large at the etching of the organic antireflection layer using a relatively small CF 4 plasma damage to A r F photoresist, then, by plasma treatment of A r F Fuotore resist layer, and then, Etching target layer If tuning is performed, throughput and etching accuracy can be improved.
- the opening pattern of the photoresist mask layer 17 3 is formed on the workpiece W having the photoresist layer 17 3 composed of an Ar F photoresist or an F 2 photoresist having an opening pattern covering the opening 2.
- a step of plasma-etching the anti-reflection layer 172 through the 173a is performed.
- an alicyclic-containing acrylic resin, a cycloolefin resin, a cycloolefin monomaleic anhydride resin, or the like can be used as the ArF photoresist and the F2 photoresist.
- an alicyclic-containing acrylic resin, a cycloolefin resin, a cycloolefin monomaleic anhydride resin, or the like can be used as the ArF photoresist and the F2 photoresist.
- an inorganic material or an organic material can be used as the antireflection layer 62.
- amorphous carbon that is a carbon-containing material or an organic polymer material can be used as the ArF photoresist and the F2 photoresist.
- the gate valve 32 is opened, the object to be processed W is carried into the processing container 2 and placed on the electrostatic chuck 11.
- the gate valve 32 is closed, the inside of the processing vessel 2 is depressurized by the exhaust device 35, and then the valve 28 is opened, and the above processing gas, for example, C 2 F 4 and 0 is supplied from the processing gas supply source 30. 2 and supplies, to the pressure in the processing container 2 to a predetermined value.
- a high-frequency power is applied to the upper electrode 21 and the lower electrode susceptor 5, and the processing gas is turned into plasma to turn the anti-reflection layer 17 2 in the object W into a photoresist mask layer 17 3. Etch through the opening pattern 173a.
- a DC voltage is applied to the electrode 12 in the electrostatic chuck 11 before and after the timing of applying the high-frequency power to the upper and lower electrodes, and the workpiece W is electrostatically attracted to the electrostatic chuck 11.
- a predetermined emission intensity is detected by an end point detector (not shown), and the etching is terminated based on this.
- the anti-reflection layer 17 2 is etched through the photoresist layer 173 using the processing gas containing C 2 F 4 as described above, for example, the processing gas containing C 2 F 4 and O 2.
- the surface roughness of the photoresist layer 173 can be suppressed, the selectivity of the antireflection layer to the photoresist layer can be kept high, and the etching rate of the antireflection layer 172 can be increased.
- the present invention can be variously modified without being limited to the above embodiment.
- the present invention is not limited to this, and another layer may be etched.
- the process gas containing C 2 F 4 not limited to those containing the C 2 F 4 0 2 and.
- the mask layer is not limited to the ArF photoresist and the F2 photoresist, and other photoresists can be used. Further, a non-resist mask layer can also be used.
- the configuration of the etching apparatus is not limited to that shown in FIG.
- the selectivity of the anti-reflection layer to the ArF photoresist mask layer was determined as in the example and FIG.
- the etching rate of the antireflection layer was 1.2 to 3.6 times that of the comparative example in the practical example.
- the surface roughness of the ArF photoresist mask layer did not occur. From this, it was confirmed that the antireflection film can be etched at a high etching rate without causing surface roughness of the ArF photoresist mask layer according to the example.
- the antireflection layer 18 2 is passed through the opening pattern 18 3 a of the photoresist layer 18 3.
- the step of etching and the step of etching the Si ⁇ 2 layer 181 after this step will be described.
- an alicyclic-containing acrylic resin, a cycloolefin resin, or a cycloolefin-maleic anhydride resin can be used.
- organic polymer material camphor foam can be used.
- the gate valve 32 is opened, and the object to be processed W is carried into the processing container 2 and placed on the electrostatic chuck 11.
- the gate valve 32 is closed, and the inside of the processing container 2 is depressurized by the exhaust device 35, and then the valve 28 is opened, and the substance having C and F and H from the processing gas supply source 30 are contained.
- object The etching gas containing the gas is supplied, and the pressure in the processing vessel 2 is set to a predetermined value, for example, 6.66 Pa (5 OmTorr).
- a predetermined value for example, 6.66 Pa (5 OmTorr).
- CF 4 which causes less damage to the ArF photoresist layer.
- hydrocarbon, H 2 , and hydrofluorocarbon can be used as the substance having H.
- CH 4 and the like are exemplified as the hydropower.
- fluoridated fluorocarbon a substance in which the ratio of the number of H atoms to the number of F atoms is 3 or more is suitable, and CH 3 F is exemplified as such a substance.
- CH 3 F the ratio of the flow rate of CH 3 F to the flow rate of the substance having C and F in the etching gas is set to 0.04 to 0.07, so that CH 3 F is completely contained.
- the remaining amount of the ArF photoresist layer after the etching of the anti-reflection layer can be considerably increased as compared with the case where no antireflection layer is etched.
- a DC power source 13 is applied to the electrodes 12 in the electrostatic chuck 11 before and after the timing of applying the high frequency power to the upper and lower electrodes, and the workpiece W is electrostatically attracted to the electrostatic chuck 11 1. I do. When the etching of the antireflection layer 182 is completed in this way, the supply of the etching gas and the high-frequency power is stopped. '
- etching gas into the processing chamber 2, for example, C 5 F 8 and supplies the 0 2 and a mixed gas of A r, a predetermined value the pressure in the processing container 2, for example 2. Adjust to 00 Pa (15 mT orr).
- the high-frequency power is applied to the upper electrode 2 1 and the lower electrode der Ru susceptor evening 5, to etch the S I_ ⁇ two layers 1 8 1 of the specimen W in the etching gas into plasma ( Figure 1 3 B During the etching, a predetermined emission intensity is detected by an end point detector (not shown), and the etching is terminated based on this.
- the etching target is not limited to the SiO 2 layer as described above.
- TE ⁇ S, BPSG, PSG, SOG, thermal oxide film, HTO, FSG, organic oxide Si film, CORAL It can be applied to the etching of oxide films (oxygen compounds) such as Novellus Corporation and low dielectric organic insulating films. Further, the configuration of the applied plasma etching apparatus is not limited to that shown in FIG.
- the object to be processed is a Si 2 layer (thickness: 2 / zm) as shown in Fig. 13A, an anti-reflection layer (thickness: 60 nm) that covers it, and an ArF photoresist that covers it further A layer having a thickness of 360 nm was used.
- the etching conditions for the antireflection layer of the example were as follows. Chi words, the pressure in the processing container 2 6. with 66 P a (5 OmTo rr) , CF 4 ( flow rate 1 0 OmLZm in (sc cm) ) a Etsu Chingugasu and CH 3 F (flow rate 4 or 7mL / min (sc cm)), a high frequency power of 1000 W is applied to the upper electrode from a high frequency power supply of 60 MHz, and a 100 W high frequency power is applied to the lower electrode from a high frequency power supply of 2 MHz. Was applied.
- H 2 flow rate is 5, 10 or 15 mLZmin (sc cm)
- CH 2 F 2 flow rate is 5 or 1 OmL / min (sc cm)
- CH 2 F flow rate is 5 or 1 OmL / min (sc cm)
- CH 2 F respectively Etching was similarly performed with an etching gas using CHF 3 (flow rate was 10, 30, 50, or 7 OmL / min (sc cm)).
- the etching gas was only CF 4 (flow rate was 10 OmL / min (sc cm)), and the other etching conditions were the same as those in the example.
- the antireflection film 182 was etched under the conditions of the above Examples and Comparative Examples, and the thickness of the remaining film of the ArF photoresist layer after a certain etching time was measured.The following results were obtained. .
- the flow rate when CH 3 F was used, the flow rate was 37 511111 for 4 mL Zm 111 and 405 nm for 37 mL Zmin.
- the flow rate when H 2 is used, the flow rate was 5MLZm in the 345 nm 1 OmL Zm in a 1 5 mL / min at 3 60 nm.
- the flow rate When CH 2 F 2 was used, the flow rate was 345 nm at 5 mL Zmin and 400 nm at 1 OmL / min.
- CHF 3 the flow rate was 350 nm at 1 OmL / min, 360 nm at 30 mL Zmin, 360 nm at 5 OmL / min, and 390 nm at 7 OmL / min. On the other hand, it was 330 nm in the comparative example.
- the thickness of the remaining film was increased in all the examples compared to the comparative example. This is probably because the F active species that etches the ArF photoresist layer reacts appropriately with the H active species generated from the H-containing gas to form a gas such as HF and is discharged out of the processing vessel.
- CH 3 F was particularly excellent.
- the chemically stable are substances such as H 2, the predominant is better to re-bond by reacting with another H active species than be generated H active species react with F active species It was assumed that there was, and the amount of remaining film was not much higher than that of other substances.
- the substance itself is to some extent unstable and contains a large number of H atoms, such as hydride carbon (CH C 2 H 4 etc.) It was confirmed that it is advisable to use a fluoride gas such as fluorene carbonate (especially one with a ratio of the number of H atoms to the number of F atoms of 3 or more, for example, CH 3 F) in the etching gas.
- a fluoride gas such as fluorene carbonate (especially one with a ratio of the number of H atoms to the number of F atoms of 3 or more, for example, CH 3 F) in the etching gas.
- CH 3 F when CH 3 F is used, the residual film is formed even if the ratio of the flow rate of CH 3 F to the flow rate of CF 4 , which is a substance containing C and F, is as small as 0.04 to 0.07. It was also confirmed that the amount could be increased.
- the SiO 2 layer 191 which is the layer to be etched, the antireflection layer 192 covering this, and the A r a step of etching the antireflection layer 192 through the opening pattern 193a of the photoresist layer 193 with respect to the object W having the photoresist layer 193 made of F photoresist or F2 photoresist, And a step of etching the SiO 2 layer 191 after this step.
- an alicyclic group-containing acrylic resin, a cycloolefin resin, or a cycloolefin-maleic anhydride resin can be used.
- organic polymer material camphor foam can be used.
- the gate valve 32 is opened, and the object to be processed W is carried into the processing container 2 and placed on the electrostatic chuck 11.
- the gate valve 32 is closed, and the inside of the processing vessel 2 is depressurized by the exhaust device 35.
- the valve 28 is opened, and the first etching gas containing CO and a substance having C and F is supplied from the processing gas supply source 30.
- the processing gas supply source 30 for example, supplying a mixed gas of CF 4 and CO, a predetermined value the pressure in the processing container 2, for example 1 3. shall be the 3 P a (l O OmTo rr ).
- a high-frequency power is applied to the upper electrode 21 and the lower electrode susceptor 5, and the first etching gas is turned into plasma to reflect in the workpiece W.
- Etch barrier layer 192 (FIG. 14A).
- a DC power supply 13 is applied to the electrode 12 in the electrostatic chuck 11 before and after the timing of applying the high-frequency power to the upper and lower electrodes, and the workpiece W is electrostatically attracted to the electrostatic chuck 11.
- the etching of the antireflection layer 192 is completed, the supply of the first etching gas and the high-frequency power is stopped.
- the second etching gas into the processing chamber 2, for example, C 5 F 8, C 4 gas containing Furuorokabon such as F 6, in particular of the C 5 F 8 or C 4 F 6 and ⁇ 2 and A r
- the mixed gas is supplied, and the pressure in the processing vessel 2 is adjusted to a predetermined value of the second etching, for example, 2.00 Pa (15 mTorr).
- a high-frequency power is applied to the upper electrode 21 and the lower electrode 5 as a susceptor, and the second etching gas is turned into plasma to etch the SiO 2 layer 191 in the object W (FIG. 14B).
- a predetermined emission intensity is detected by a final inspection device (not shown), and the etching is terminated based on the detected intensity.
- the etching target portion is not limited to the S i 0 2 layer as described above, TE_ ⁇ _S, B PS G, P SG, S_ ⁇ _G, thermal oxide film, HTO, FSG, organic oxide S i It can be applied to the etching of oxide films (oxygen compounds) such as films, CORAL (Novelas) and low dielectric organic insulating films. Further, the configuration of the applied plasma etching apparatus is not limited to that shown in FIG.
- the object to be processed was that shown in FIG. 14A.
- the first etching conditions of the example were as follows. That is, the pressure in the processing container 2 6. with 66 P a (5 OmT orr) or 1 3. 3 P a (l O OmTo rr), the flow rate of the first etching gas CF 4: 7 5, 1 00 or 2001111 ⁇ 7 min (sc cm), CO: 25, 100 or 200 mL / min (sc cm) .Apply 1000, 1500 or 2000 W high frequency power from a high frequency power supply of 60 MHz to the upper electrode, and apply 100 W high frequency power from a high frequency power supply of 2 MHz to the lower electrode.
- 66 P a 5 OmT orr
- 1 3. 3 P a (l O OmTo rr)
- the flow rate of the first etching gas CF 4 7 5, 1 00 or 2001111 ⁇ 7 min (sc cm), CO: 25, 100 or 200 mL / min (sc cm) .
- the first etching conditions of the comparative example were as follows. That is, the container pressure 6. with 66 P a (5 OmT orr) , added at a flow rate of the first etching gas CF 4 alone 10 OmLZm in (sccm) (the CO without addition), the high frequency power source And the applied power were the same as in the example.
- the second etching conditions of the example and the comparative example were as follows. Ie, the processing container pressure 2.
- the etching selection ratio (S i 0 2 layer against the A r F photoresist layer of S I_ ⁇ two layers in the second etching step
- the rate of the etching rate of the ZA rF photoresist layer was much higher in the example than in the comparative example.
- the selection ratio at the time of 1000 W was 9.7, and the selection ratio of the comparative example was 6.3.
- the plasma of a gas containing a substance having C and F and C 0 Since it is considered that a protective film having a carbon-carbon bond is formed on the surface of the ArF photoresist layer, the plasma of a gas containing CO and a substance having C and F is merely formed on the surface of the ArF photoresist layer. Irradiation alone can improve the plasma resistance of the ArF photoresist layer.
- the present invention can be applied to a mask layer other than the ArF photoresist layer, although the effect of improving the plasma resistance is not as great as that of the ArF photoresist layer.
- the second etching gas may be C 5 is not limited to a gas containing F 8 or C 4 F 6, fluorosilicone force one Pont, also gas containing other fluorine-containing compounds such as Hyde port fluorocarbon used.
- the SiO 2 layer 201 to be etched, the organic anti-reflection layer 202 covering this An object to be processed W having an ArF photoresist or a photoresist layer 203 made of F2 photoresist on which an opening pattern 203 covering the organic antireflection layer 202 is formed, through the opening pattern of the register strike layer 2 0 3, carrying out the organic anti-reflective layer 2 0 2 and a step of plasma etching, and then a step of plasma Etsu Jin grayed the S i 0 2 layers 2 0 1.
- an alicyclic group-containing acrylic resin, a critic resin, a cycloolefin-maleic anhydride resin can be used as the ArF photoresist and the F2 photoresist.
- the organic antireflection layer 202 is formed of, for example, an organic polymer material.
- the gate valve 32 is opened, and the object W is loaded into the processing container 2 and placed on the electrostatic chuck 11.
- the gate valve 32 is closed, the pressure in the processing chamber 2 is reduced by the exhaust device 35, and the valve 28 is opened.
- an etching gas containing Si F 4 which is a Si-containing substance, is supplied from the etching gas supply source 30 to set the pressure in the processing chamber 2 to a predetermined value.
- the etching gas may contain CHF 3 , HBr, He or H 2 in addition to the Si-containing substance, for example, Si F 4 and H 2 are used.
- the Si ⁇ 2 layer 201 is plasma-etched through the opening pattern 203 a of the photoresist layer in the same procedure as the etching of the organic antireflection layer 202.
- the etching gas in this case, for example, C 4 F 6 and 0 2 and can be used, A r is not limited thereto.
- the etching gas of the organic antireflection layer 202 contains H 2
- the conversion into C-bonding, combined with the formation of a thin hardened layer containing Si on the surface of the photoresist layer 203, can further improve plasma resistance.
- the photoresist layer 203 which has improved plasma resistance when the organic antireflection layer 202 is etched, is plasma-resistant even in the plasma etching of the SiO 2 layer 201 to be etched. Is maintained high, and plasma etching can be performed without causing surface roughening or vertical streaking of the photoresist layer.
- the layer to be etched is not limited to the Si oxide represented by the above-mentioned Si ⁇ ⁇ 2, but may be other Si compounds such as Si nitride, Si carbide, single crystal i, polycrystalline S i, organic materials, organic-inorganic hybrid materials, metals, metal compounds, etc. are applicable. Further, the configuration of the plasma processing apparatus is not limited to that shown in FIG.
- the etching of the organic anti-reflection layer using various etching gases containing a substance containing Si using the object having the structure shown in FIG. 15 (Examples 9-11 to 9-17) and The organic antireflection layer was etched using an etching gas having no Si-containing substance (Comparative Examples 9-1 and 9-2).
- the frequencies of the first high-frequency power supply and the second high-frequency power supply in each example and comparative example were set to 60 MHz and 13.56 MHz, respectively.
- High frequency power from the first high frequency power supply 300 W
- High frequency power from the first high frequency power supply 700 W
- High frequency power from the second high frequency power supply 100 W
- High frequency power from the first high frequency power supply 300 W
- High frequency power from the second high frequency power supply 60 W
- High frequency power from the first high frequency power supply 300 W
- High frequency power from the second high frequency power supply 60W Etching gas and its flow rate:
- Processing chamber pressure 0.67 Pa (5 mTorr)
- High frequency power from the first high frequency power supply 300 W
- High frequency power from the second high frequency power supply 60 W
- Etching gas and its flow rate
- Processing container pressure 6.7 Pa (5 OmTorr)
- High frequency power from the first high frequency power supply 1000 W
- High frequency power from the second high frequency power supply 100 W Etching gas and its flow rate:
- Processing container pressure 6.7 Pa (5 OmTorr) High frequency power from the first high frequency power supply: 1 000 W High frequency power from the second high frequency power supply: 100 W
- High frequency power from the second high frequency power supply 350W
- the ArF photoresist and the F2 photoresist an alicyclic-containing acrylic resin, a cycloolefin resin, a cycloolefin-maleic anhydride resin, a methyl acrylate resin, or the like may be used. it can.
- the upper electrode plate 24 which is also a shower head in the apparatus of FIG. 1 is made of Si.
- the gate valve 32 is opened, and the object to be processed W is carried into the processing container 2 and placed on the electrostatic chuck 11.
- the gate valve 32 is closed, the inside of the processing vessel 2 is depressurized by the exhaust device 35, and then the valve 28 is opened, and an inert gas, for example, Ar is supplied from the processing gas supply source 30 to the processing vessel.
- the pressure in 2 is assumed to be, for example, 1.33 Pa (10 mTorr). Inert gases such as Kr, Xe, etc. May be used.
- high-frequency power is applied to the upper electrode 21 and the lower electrode susceptor 5 from the high-frequency power supplies 40 and 50, respectively, and at least a part of the inert gas is ionized to form the upper electrode made of Si.
- a DC power source 13 is applied to the electrodes 12 in the electrostatic chuck 11 before and after the timing of applying the high frequency power to the upper and lower electrodes, and the workpiece W is placed on the electrostatic chuck 11. To be electrostatically attracted.
- the high-frequency power applied to the upper electrode 21 is energy that promotes ionization of the inert gas.
- a Si-containing layer 2 13 can be formed on the surface of the mask layer 2 12, as shown in FIG. 16B. If the time for forming the Si-containing layer 2 13 on the surface of the mask layer 2 12 is too short, the effect of improving the plasma resistance is insufficient, and if it is too long, the layer to be etched at the opening of the mask layer 2 12 It is preferable to select an appropriate time since a large amount of the Si-containing layer is also formed on the surface of the 211 surface, which hinders subsequent etching.
- the time of the above processing is preferably in a range of 60 to 90 seconds.
- the above conditions are more effective when the upper electrode applied power is set to 125 W and the susceptor applied power is set to 400 W (the so-called V PP is lowered).
- the change of the opening shape of the mask layer at the time can be reduced. If V pp is too high, the opening of the mask layer will be widened, and it will be impossible to create a hole or groove in the opening pattern designed in the subsequent etching process.
- the application of the high-frequency power is stopped.
- an etching gas is introduced into the processing container 2, and high-frequency power is applied to the upper electrode 21 and the susceptor 5 to etch the etching target layer 211.
- the etching target layer 211 is formed of Si oxide, it is a gas containing at least one selected from C 4 F 6 , C 4 F 8 , and C 5 F 8 Is preferred.
- a mixed gas of C 4 F 6 , ⁇ 2 and Ar is exemplified.
- the pressure in the processing vessel 2 is 2.67 Pa (20 mTorr)
- the high-frequency power applied to the upper electrode 21 and the susceptor 5 is 160 W and 800 W, respectively. Is exemplified.
- the frequency of the high-frequency power at this time is, for example, 60 MHz or 2 MHz, which is the same as in the sputtering.
- the application of high frequency power transforms the etching gas into a plasma, and etches the etching target layer 211 made of, for example, Si oxide.
- stop applying the etching gas and the high-frequency power is, for example, 60 MHz or 2 MHz, which is the same as in the sputtering.
- the selectivity of the etching target layer 211 to the mask layer 212 (the etching ratio of the etching target layer to the etching target layer)
- the etching rate was 28.8.
- the etching selectivity was 8.2 when the Si-containing layer was not formed on the surface of the mask layer 212.
- a step of removing the mask layer 211 on which the Si-containing layer 21 is formed is subsequently performed.
- an example is shown in which the removal of the mask layer 211 having the Si-containing layer 211 formed on the surface is performed in multiple stages.
- a gas containing fluorine for example, CF 4 is introduced into the processing vessel 2, high-frequency power is applied to the upper electrode 21 and the susceptor 5 for a predetermined time, and the S layer formed on the mask layer 212 is formed.
- the i-containing layer 2 13 is almost completely removed.
- the Si-containing layer 2 13 can be almost completely removed.
- the gas for this in the case of using the added gas to CF 4 0 2 and A r is had damage to the mask layer 2 1 2 consisting of A r F photoresist. Therefore, either by using the CF 4 alone gas is preferably a small amount in the case of adding the CF 4 0 2 and A r like.
- the gas containing a fluorine compound but may be used CF 4 gas other than, the damage to the mask layer 2 1 2 consisting of A r F follower Bok Regis Bok etc. of the underlying S i containing layer 2 1 3 It is preferable to use CF 4 from the viewpoint of reducing the amount.
- the processing gas may be a gas containing no fluorine compound, for example, a gas containing 0 2 gas alone, a mixed gas containing O 2 and N 2 or Ar, or a mixed gas containing ⁇ 2 , N 2 and H 2. It is preferable to use such as.
- This second stage processing was actually performed. In this case, the pressure, the high frequency power, the frequency of the high frequency power supply, and the like were not changed from the example in the first stage, and the asshing was performed by changing only the processing gas.
- the inert gas is ionized by the energy when high-frequency power is applied to the parallel plate type electrode, whereby the upper electrode plate 24 made of Si is sputtered to form the mask layer 2. Since the Si-containing layer is formed by adhering to the surface of No. 12, the plasma resistance can be considerably improved as compared with the mask layer itself. In particular, when an ArF photoresist or an F2 photoresist having low plasma resistance is used as the mask layer 212, the effect of improving the plasma resistance is remarkable.
- the Si-containing layer 211 is removed in multiple steps, ie, the removal of the Si-containing layer 211 and the removal of the mask layer 212 itself. Even when the mask 3 and the mask layer are formed, it is possible to perform the removal suitable for the properties of each layer. Of course, it is also possible to remove the Si-containing layer 211 and the mask layer 212 all at once. Which one to use may be determined by comparing the overall advantages and disadvantages of multi-step and one-time removal.
- the target for forming the Si-containing layer on the mask layer by sputtering is not limited to the above-described upper electrode plate, and at least a part of the surface disposed in the processing container is Si. If it is a member, another member such as a focus ring may be used. Alternatively, a Si member may be arranged as a target. In addition, other Si wafers (bare wafers) that have not been subjected to device processing can be used as targets by placing them in processing vessels. In addition, as Si used as a target, single crystal Si is convenient for performing sputtering.
- the sputtering was performed using high-frequency energy using a parallel plate type apparatus for performing plasma etching.
- the present invention is not limited to this, and at least energy for at least part of the inert gas to be ionized can be provided. Things can be adopted.
- the energy is not limited to high-frequency energy but may be microphone mouth-wave energy.
- a method in which an induction electromagnetic field is formed by applying antenna high-frequency power can be used, unlike the above-described parallel plate.
- the method of forming the Si-containing layer 21 3 on the surface of the mask layer 21 is not limited to sputtering.
- the Si-containing layer 213 may be formed on the surface of the mask layer 221 by CVD.
- an organic silane-based gas or an inorganic silane-based gas can be used as a raw material gas, but an inorganic silane-based gas is more preferable.
- CVD in this case can be carried out using these gases according to a conventional method.
- the Si-containing layer 21 on the surface of the mask layer 21 As a method of forming the Si-containing layer 21 on the surface of the mask layer 21, a method of adding a Si compound such as SiF 4 to an etching gas can be adopted. This makes it possible to simultaneously improve the body plasma properties of the mask layer 211 made of an ArF photoresist or an F2 photoresist and to etch the etching target layer 211.
- the etching target layer is as described above.
- the material is not limited to Si oxide, and various materials such as SiC, SiN, organic low dielectric, SiOF, metal, and metal compound can be applied.
- the layer formed on the surface of the mask layer contains Si as a main component, it is difficult to apply the method to a workpiece whose etching target layer is Si.
- the mask layer is not limited to photoresist materials having low plasma resistance, such as ArF photoresist and F2 photoresist, but may be other organic photoresist layers, and is not limited to photoresist. Alternatively, another mask layer may be used.
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Abstract
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JP2004548902A JPWO2004003988A1 (ja) | 2002-06-27 | 2003-06-24 | プラズマ処理方法 |
AU2003244166A AU2003244166A1 (en) | 2002-06-27 | 2003-06-24 | Plasma processing method |
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JP2002-187422 | 2002-06-27 | ||
JP2002187422 | 2002-06-27 | ||
JP2002-214628 | 2002-07-24 | ||
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JP2002-271588 | 2002-09-18 | ||
JP2002-271589 | 2002-09-18 | ||
JP2002271589 | 2002-09-18 | ||
JP2002271588 | 2002-09-18 | ||
US42078802P | 2002-10-24 | 2002-10-24 | |
US60/420,788 | 2002-10-24 | ||
US42356602P | 2002-11-05 | 2002-11-05 | |
US60/423,566 | 2002-11-05 | ||
JP2003-003540 | 2003-01-09 | ||
JP2003003540 | 2003-01-09 | ||
JP2003110225 | 2003-04-15 | ||
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CN (1) | CN100440449C (ja) |
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TWI265569B (en) | 2006-11-01 |
CN1663030A (zh) | 2005-08-31 |
AU2003244166A1 (en) | 2004-01-19 |
JP2009164626A (ja) | 2009-07-23 |
JP5008691B2 (ja) | 2012-08-22 |
CN100440449C (zh) | 2008-12-03 |
TW200401365A (en) | 2004-01-16 |
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