WO2019194247A1 - プラズマ処理装置用部材およびこれを備えるプラズマ処理装置ならびにプラズマ処理装置用部材の製造方法 - Google Patents
プラズマ処理装置用部材およびこれを備えるプラズマ処理装置ならびにプラズマ処理装置用部材の製造方法 Download PDFInfo
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- WO2019194247A1 WO2019194247A1 PCT/JP2019/014874 JP2019014874W WO2019194247A1 WO 2019194247 A1 WO2019194247 A1 WO 2019194247A1 JP 2019014874 W JP2019014874 W JP 2019014874W WO 2019194247 A1 WO2019194247 A1 WO 2019194247A1
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- B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
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- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
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- C23C16/4401—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
- C23C16/45536—Use of plasma, radiation or electromagnetic fields
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4581—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber characterised by material of construction or surface finish of the means for supporting the substrate
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/02252—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by plasma treatment, e.g. plasma oxidation of the substrate
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Definitions
- the present disclosure relates to a member for a plasma processing apparatus, a plasma processing apparatus including the same, and a method for manufacturing a member for a plasma processing apparatus.
- a member for a plasma processing apparatus including a base material and a film made of yttrium oxide on the base material has been used.
- the porosity (area ratio of open pores) of the surface exposed to plasma hereinafter sometimes simply referred to as a surface) is small. It has been demanded.
- Patent Document 1 a Y 2 O 3 sprayed coating having a porosity of 5% or more is formed on the surface of a ceramic substrate by atmospheric plasma spraying, and a Y of porosity of less than 5% is formed on the sprayed coating.
- a member in a plasma processing container formed by stacking 2 O 3 sprayed coatings has been proposed.
- the member for a plasma processing apparatus of the present disclosure includes a base material, and a rare earth element oxide, fluoride, oxyfluoride, or nitride film on at least a part of the base material.
- the membrane has an area occupation ratio of open pores on the surface exposed to plasma of 8 area% or less, and an average diameter of open pores of 8 ⁇ m or less.
- the plasma processing apparatus of the present disclosure includes the above-described member for a plasma processing apparatus.
- the method for manufacturing a member for a plasma processing apparatus includes a step of forming a first layer mainly composed of yttrium oxide on a base material by a sputtering method, and a step of smoothing a film-forming surface of the first layer. And forming a second layer mainly composed of yttrium oxide on the treated surface of the smoothed first layer by a sputtering method.
- FIG. 1A is a photograph of a surface of a plasma processing apparatus member of the present disclosure exposed to plasma with an optical microscope
- FIG. 1B is a cross-sectional view schematically showing the plasma processing apparatus member
- FIG. 5 is a cross-sectional view schematically showing another example of a member for a plasma processing apparatus.
- the member 10 for a plasma processing apparatus includes a base material 5 and a rare earth element oxide film 3 on at least a part of the base material 5.
- the surface of the film 3 exposed to plasma has a plurality of open pores 4, and FIGS. 1A to 1C show an example having a plurality of open pores 4a, 4b,. Further, an example in which a plurality of closed pores 6 are provided inside the membrane 3 is shown.
- membrane 3 is provided with the 1st layer (lower layer) 1 located on the base material 5, and the 2nd layer (upper layer) 2 located on the 1st layer (lower layer) 1. Is shown.
- the base material 5 examples include quartz, aluminum having a purity of 99.999% (5N) or higher, aluminum alloys such as an aluminum 6061 alloy, aluminum nitride ceramics, and aluminum oxide ceramics.
- the aluminum nitride ceramic is a ceramic having an aluminum nitride content of 90% by mass or more, which is a value obtained by converting Al into AlN, out of a total of 100% by mass of the components constituting the substrate 5.
- the aluminum oxide ceramic is a ceramic having a content of aluminum oxide of 90% by mass or more, which is a value obtained by converting Al into Al 2 O 3 out of a total of 100% by mass of the components constituting the substrate 5.
- the aluminum oxide ceramics may contain magnesium oxide, calcium oxide, silicon oxide and the like in addition to aluminum oxide.
- the film 3 is an oxide of a rare earth element.
- the rare earth element include yttrium (Y), cerium (Ce), samarium (Sm), gadolinium (Gd), dysprosium (Dy), erbium (Er), and ytterbium. (Yb) etc. are mentioned.
- Y yttrium
- Ce cerium
- Sm samarium
- Gd gadolinium
- Dy dysprosium
- Er erbium
- Yb ytterbium
- the film 3 does not contain any elements other than rare earth element oxides, and in addition to the rare earth elements, fluorine (F), sodium (Na), Magnesium (Mg), aluminum (Al), silicon (Si), phosphorus (P), sulfur (S), chlorine (Cl), potassium (K), calcium (Ca), titanium (Ti), chromium (Cr), Manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), strontium (Sr), and the like may be included.
- fluorine (F), sodium (Na), Magnesium (Mg), aluminum (Al), silicon (Si), phosphorus (P), sulfur (S), chlorine (Cl), potassium (K), calcium (Ca), titanium (Ti), chromium (Cr), Manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), strontium (Sr), and the like may be included.
- the thickness of the film 3 is 10 ⁇ m or more and 200 ⁇ m or less, and the micro Vickers hardness Hmv of the film 3 is 7.5 GPa or more.
- the main component of the film may be, for example, yttrium oxide represented by Y 2 O 3-x (0 ⁇ x ⁇ 1) from which oxygen is lost when the rare earth element is yttrium. When represented by this composition formula, since it has semiconductivity, charging on the surface of the film 3 can be suppressed.
- the components constituting the substrate 5 and the film 3 can be identified by an X-ray diffractometer using CuK ⁇ rays, and the content of each component is, for example, an ICP (Inductively Coupled Plasma) emission spectroscopic analyzer. Alternatively, it can be obtained by a fluorescent X-ray analyzer.
- ICP Inductively Coupled Plasma
- the membrane 3 has an area occupation ratio of the open pores 4 on the surface exposed to plasma of 8 area% or less, and an average diameter of the open pores 4 is 8 ⁇ m or less.
- the plasma processing apparatus member of the present disclosure is excellent in plasma resistance.
- the plasma processing apparatus can be used for a long period of time and includes the plasma processing apparatus member of the present disclosure. Is excellent in reliability.
- the surface exposed to the plasma is used as the measurement surface. Then, using a digital microscope (VHX-5000, manufactured by Keyence Corporation), the epi-illumination is set to coaxial epi-illumination, the illumination intensity is set to 255, and the ZS20 lens corresponding to the objective lens is set to 100 times.
- VHX-5000 digital microscope
- the luminance is selected in the automatic area measurement mode in a range where the area is 7.223 mm 2 (the length in the horizontal direction is 3.1 mm, the length in the vertical direction is 2.33 mm), and a dark region (open pores)
- the average diameter and area occupancy of the open pores of the membrane 3 can be calculated by setting the threshold value to, for example, -20.
- the threshold value may be set as appropriate according to the brightness of the dark area.
- the area occupation ratio of the open pores 4 on the surface exposed to the plasma may be 4 area% or less, and the average diameter of the open pores 4 may be 4 ⁇ m or less.
- the area where the average diameter of the open pores 4 is 8 ⁇ m or less and the area occupation ratio of the open pores 4 is 8 area% or less occupies 5% or more from the surface with respect to the thickness of the membrane 3. It may be.
- the area occupation ratio of the open pores 4 is applied only to the surface exposed to the plasma, but here, in calculating the area occupation ratio, the pores appearing on the surface are also opened by polishing the surface. The pores 4 are used.
- this region corresponds to the second layer 2.
- the average diameter of the open pores 4 was 8 ⁇ m or less, and the area occupation ratio of the open pores 4 was 8 area% or less, not only on the surface but also when exposed from the surface to the inside. Also on the surface, the number of particles generated from the inside of the open pores 4 is small, and the size of the generated particles is small. Therefore, it is possible to perform the plasma treatment satisfactorily over a long period of time.
- the lower limit of the average diameter of the open pores 4 is not particularly limited, but is preferably 0.5 ⁇ m or more. If the open pores 4 are too small, the effect of providing open pores may be insufficient. Further, the lower limit of the area occupation ratio of the open pores 4 is not particularly limited, but is preferably 0.5% or more. If the area occupation ratio of the open pores is too small, the effect of providing the open pores may be insufficient.
- the film 3 may include a void portion 8 extending in the thickness direction from the concave portion 7 located on the surface of the base material 5 facing the film 3, and the tip of the void portion 8 may be blocked within the film 3.
- the concave portion 7 refers to open pores or voids on the surface of the base material 5 facing the film 3, and is the surface of the base material 5 before the film 3 is formed.
- the film 3 includes the void 8
- the accumulation of residual stress can be suppressed even when the temperature rise and fall are repeated, and since the void 8 is not communicated with the outside, particles in the void 8 can be prevented. It is not discharged out of the membrane 3.
- the width of the gap 8 in a cross-sectional view along the thickness direction of the film 3 may be narrower on the surface side of the film 3 than on the recess 7 side of the substrate 5. In such a configuration, even if the film 3 is exposed to plasma, the film thickness is reduced, and the tip of the gap 8 is opened, the surface of the film 3 is more on the surface side than the recess 7 side of the substrate 5. It is more difficult for the particles in the void 8 to be discharged out of the film 3 than when the width of is large.
- the base material 5 is made of ceramics mainly composed of aluminum oxide.
- the base material 5 is formed on the coated surface of the base material 5 facing the film 3 by yttrium aluminum garnet (YAG) or yttrium aluminum monoclinic (YAM). ) And yttrium aluminum perovskite (YAP).
- each first subcomponent powder is weighed.
- the aluminum oxide A powder and the aluminum oxide B powder have a mass ratio of 40:60 to 60:40, and among the 100 mass% of the components constituting the obtained alumina ceramic, Al is Al. Weigh so that the content in terms of 2 O 3 is 99.4% by mass or more to obtain aluminum oxide powder.
- the amount of Na in the aluminum oxide mixed powder is first grasped, and the amount of Na in the case of alumina ceramics is converted to Na 2 O, and this converted value and the first Weighing is performed so that the ratio of the component (in this example, Si, Ca, etc.) constituting the subcomponent powder to a value converted to an oxide is 1.1 or less.
- the slurry is spray-granulated to obtain granules, and then the granules are formed into a predetermined shape by a powder press forming apparatus, an isostatic press forming apparatus, etc., and subjected to cutting as necessary to form a substrate-like formed body Get.
- the substrate 5 can be obtained by polishing using a polishing disk made of tin.
- FIG. 2 is a schematic diagram showing the sputtering apparatus 20.
- the sputtering apparatus 20 includes a chamber 15, a gas supply source 13 connected to the chamber 15, an anode 14 and a cathode 12 located in the chamber 15, and a cathode 12.
- a target 11 connected to the side is provided.
- the base material 5 obtained by the above-described method is installed on the anode 14 side in the chamber 15. Further, a target 11 mainly composed of a rare earth element, here metal yttrium, is installed on the cathode 12 side on the opposite side in the chamber 15. In this state, the inside of the chamber 15 is decompressed by the exhaust pump, and argon and oxygen are supplied as the gas G from the gas supply source 13.
- an electric field is applied between the anode 14 and the cathode 12 by a power source to generate plasma P and perform sputtering, thereby forming a metal yttrium film on the surface of the substrate 5.
- the thickness in one formation is sub-nm.
- an oxidation process of the metal yttrium film is performed.
- the first layer 1 can be obtained by alternately performing the formation of the metal yttrium film and the oxidation step so that the total thickness of the film is 10 ⁇ m or more and 200 ⁇ m or less.
- a member for a plasma processing apparatus including at least one of yttrium aluminum garnet (YAG), yttrium aluminum monoclinic (YAM), and yttrium aluminum perovskite (YAP) on the surface of the substrate 5 facing the film
- YAG yttrium aluminum garnet
- YAM yttrium aluminum monoclinic
- YAP yttrium aluminum perovskite
- the temperature of the substrate 5 in sputtering may be set to 400 ° C. or higher.
- the power input from the power supply may be either high frequency power or direct current power.
- the base material 5 on which the first layer 1 is formed is taken out of the chamber 15 and the film formation surface of the first layer 1 is smoothed.
- the smoothing treatment is, for example, polishing, and the film-forming surface of the first layer 1 is polished using diamond abrasive grains having an average particle diameter of 1 ⁇ m or more and 5 ⁇ m or less and a polishing disk made of tin.
- the treated surface may be used.
- a plasma processing apparatus member 10 that includes a void portion 8 extending in the thickness direction from a concave portion 7 positioned on the surface of the substrate 5 facing the film, and the tip of the void portion 8 is closed in the film 3.
- the average diameter of the open pores 4 on the surface of the substrate 5 facing the membrane is 1 ⁇ m or more and 8 ⁇ m or less
- the average surface diameter of the open pores on the first layer 1 is 0.1 ⁇ m or more and 5 ⁇ m. What is necessary is just to grind
- membrane is formed with the sputtering apparatus 20 shown in FIG. 2 using the thing whose average diameter of the open pore in the surface opposite to a film
- the width of the gap 8 in cross-sectional view is narrower on the surface side of the film than on the recess 7 side of the substrate 5, and the average diameter of the open pores on the film formation surface of the first layer 1 is 0.1 ⁇ m or more and 5 ⁇ m.
- the member 10 for plasma processing apparatuses of this indication is formed by forming the 2nd layer 2 which has yttrium oxide as a main component on the processing surface of the 1st layer 1 by the same method as the method of obtaining the 1st layer 1. Can be obtained.
- the plasma processing apparatus member 10 of the present disclosure obtained by the manufacturing method described above can reduce the number of particles generated from the inside of the open pores and can reduce the size of the generated particles. It may be a high-frequency transmission window member that transmits high-frequency waves for generating plasma, a shower plate for distributing plasma generation gas, a susceptor for mounting a semiconductor wafer, and the like.
- the plasma processing apparatus member 21 of the present disclosure includes a base material 22, and a rare earth element oxide, fluoride, oxyfluoride, or nitride film 23 on at least a part of the base material 22.
- a base material 22 As shown in FIG. 3B, the plasma processing apparatus member 21 of the present disclosure includes a base material 22, and a rare earth element oxide, fluoride, oxyfluoride, or nitride film 23 on at least a part of the base material 22.
- 3B shows an example in which one upper surface 22a of the base material 22 is covered with a film 23.
- the surface of the film 23 exposed to plasma (the upper surface in FIG. 3B, hereinafter may be simply referred to as the surface) has an arithmetic average roughness Ra of 0.01 ⁇ m or more and 0.1 ⁇ m or less.
- the surface has a plurality of pores 24.
- FIG. 3A shows an example having a plurality of pores 24a, 24b,. Note that the surface of the film 23 exposed to plasma includes a surface that is exposed to plasma and newly exposed as the thickness of the film decreases.
- the arithmetic average roughness Ra may be measured according to JIS B 0601-2013. Specifically, if using a surface roughness measuring machine (surf coder) SE500 manufactured by Kosaka Laboratory, the radius of the stylus is 5 ⁇ m, the measurement length is 2.5 mm, and the cut-off value is 0.8 mm. Good.
- surf coder surface roughness measuring machine
- FIG. 3B the presence of the film 23 is described so as to clarify, and the correlation between the thicknesses of the base material 22 and the film 23 is not faithfully represented.
- the film 23 is an oxide, fluoride, oxyfluoride, or nitride of a rare earth element (hereinafter, oxide, fluoride, oxyfluoride, and nitride are collectively referred to as a compound), and is used as a rare earth element.
- a rare earth element Yttrium (Y), cerium (Ce), samarium (Sm), gadolinium (Gd), dysprosium (Dy), erbium (Er), ytterbium (Yb) and the like.
- Y Yttrium
- Ce cerium
- Sm samarium
- Gd gadolinium
- Dy dysprosium
- Er erbium
- Yb ytterbium
- composition formula of the yttrium compound is, for example, Y 2 O 3-x (0 ⁇ x ⁇ 1), YF 3 , YOF, Y 5 O 4 F 7 , Y 5 O 6 F 7 , Y 6 O 5 F 8 , Y 7 O 6 F 9 , Y 17 O 14 F 23 or YN may be mentioned.
- the film 23 does not contain anything other than a rare earth element compound, and in addition to the rare earth element, fluorine (F), sodium (Na), magnesium, etc., depending on the purity of the target used when forming the film 23 and the device configuration.
- F fluorine
- Na sodium
- magnesium etc.
- the components constituting the film 23 may be identified using a thin film X-ray diffractometer.
- Examples of the base material 22 include quartz, aluminum having a purity of 99.999% (5N) or higher, aluminum alloys such as an aluminum 6061 alloy, aluminum nitride ceramics, and aluminum oxide ceramics.
- the aluminum nitride ceramics and the aluminum oxide ceramics are, for example, aluminum oxide ceramics, and the oxidation is a value obtained by converting Al into Al 2 O 3 in a total of 100% by mass of the components constituting the substrate 22. Ceramics with an aluminum content of 90% by mass or more.
- the aluminum oxide ceramics may contain magnesium oxide, calcium oxide, silicon oxide and the like in addition to aluminum oxide.
- the film 23 has a plurality of pores, and a value A obtained by subtracting the average value of the equivalent circle diameter of the pores from the average value of the distance between the centers of gravity of the adjacent pores is 28 ⁇ m or more and 48 ⁇ m or less.
- the member 21 for a plasma processing apparatus that satisfies the above configuration has a small number of particles generated from inside the pores.
- the microcracks are dispersed so that they can be blocked by nearby pores. Few.
- the area occupation ratio of the plurality of pores in the film 23 may be 1.5 area% or more and 6 area% or less.
- the area occupation ratio of the pores is 1.5 area% or more and 6 area% or less, the surface exposed to plasma (including the surface exposed to plasma and newly exposed by decreasing the film thickness) is microscopic. Even if cracks occur, the extension of the microcracks can be blocked by the pores, so the number of particles accompanying the microcracks is small.
- the area ratio of pores on the surface exposed to plasma is low, the number of particles generated from the inside of the pores is further reduced.
- the average value of the spheroidization rate of the pores in the film 23 may be 60% or more.
- the spheroidization rate of the pores is within this range, it is difficult for residual stress to accumulate in the peripheral portion of the pores, so that particles are hardly generated from the peripheral portion of the pores when exposed to plasma.
- the spheroidization rate of the pores is obtained by diverting a ratio defined by the graphite area method, and is defined by the following formula (1).
- Porosity of spheroids (%) (actual area of pores) / (area of minimum circumscribed circle of pores) ⁇ 100 (1)
- the average value of the spheroidization ratio of pores is preferably 62% or more.
- the average value of the distance between the centers of gravity of the pores, the average value of the equivalent circle diameter of the pores, the area occupancy rate, and the spheroidization rate can be obtained by the following methods.
- the surface of the film is observed at a magnification of 100 times using a digital microscope.
- the area is 7.68 mm 2 (the length in the horizontal direction is 3.2 mm and the length in the vertical direction is 2.4 mm).
- Image observation software “A Image-kun (ver2.52)” registered trademark, manufactured by Asahi Kasei Engineering Co., Ltd.
- later image analysis software “A Image-kun” In this case, the average value of the distance between the centroids of the pores can be obtained by a method called the centroid distance method of dispersion measurement using Asahi Kasei Engineering Co., Ltd. image analysis software.
- the average value of the circle equivalent diameter of the pores, the area occupation ratio, and the spheroidization ratio are obtained. Can be sought. Note that the region corresponding to the pores in the observed image can be identified because it appears as a dark region.
- a threshold that is an index indicating the brightness of an image is 140, the brightness is dark, the small figure removal area is 1 ⁇ m 2 , and a noise removal filter is provided.
- the threshold value is 140, but the threshold value may be adjusted according to the brightness of the observation image, the brightness is dark, the binarization method is manual, and the small figure removal area is 1 ⁇ m 2.
- the threshold value may be adjusted so that the marker whose size changes depending on the threshold value in the observation image matches the shape of the pores, with the noise removal filter.
- the kurtosis Ku1 of the equivalent circle diameter of the plurality of pores in the film 23 may be 0.5 or more and 2 or less.
- the kurtosis Ku1 of the equivalent circle diameter of the pores is within this range, the distribution of the equivalent circle diameter of the pores is narrow, and there are few abnormally large pore equivalent diameter pores, so that it has an effect of suppressing the extension of microcracks.
- the number of particles generated from the inside of the pores is small, and the plasma resistance is excellent.
- the film 23 satisfying the above configuration has less uneven wear, so that a desired surface property can be formed with a minimum polishing amount.
- the kurtosis Ku1 is preferably 1.3 or more and 1.9 or less.
- the kurtosis Ku1 is an index (statistic) indicating how much the distribution peak and tail are different from the normal distribution.
- the peak has a sharp peak and a long thick tail.
- the distribution is a normal distribution, and when the kurtosis Ku1 ⁇ 0, the distribution is a distribution having a rounded peak and a short thin tail.
- the kurtosis Ku1 of the equivalent circle diameter of the pores may be obtained by using a function Kurt provided in Excel (registered trademark, Microsoft Corporation).
- the skewness Sk1 of the equivalent circle diameter of the plurality of pores in the film 23 may be 3 or more and 5.6 or less.
- the skewness Sk1 of the equivalent circle diameter of the pores is within this range, the average value of the equivalent circle diameter of the pores is small, and since there are few abnormally large pore equivalent diameters, the microcrack expansion suppressing effect is obtained.
- the number of particles generated from the inside of the pores is small, and the plasma resistance is excellent.
- the film 23 satisfying the above configuration has less uneven wear, so that a desired surface property can be formed with a minimum polishing amount.
- the skewness Sk1 is preferably 3.2 or more and 5.3 or less.
- the skewness Sk1 is an index (statistic) indicating how much the distribution is distorted from the normal distribution, that is, the symmetry of the distribution.
- the skewness Sk1 ⁇ 0 the distribution skirt is directed to the left.
- the skewness Sk1 of the equivalent circle diameter of the pores may be obtained by using a function SKEW provided in Excel (registered trademark, Microsoft® Corporation).
- the kurtosis Ku2 of the distance between the centers of gravity of the pores in the film 23 may be 0.1 or more and 0.5 or less.
- the kurtosis Ku2 of the center-to-center distance between the pores is within this range, the distribution of the center-to-center distance is narrow, and the abnormally large center-to-center distance is small. Can be suppressed.
- the skewness Sk2 of the distance between the centers of gravity of the pores in the film 23 may be 0.5 or more and 1 or less.
- the relative density of the film 23 may be 98% or more, and particularly 99% or more. When the relative density is within this range, since the film 23 is dense, even if the film 23 is exposed to plasma and the thickness of the film 23 is reduced, generation of particles can be suppressed.
- the relative density of the film 23 first, a measured density is obtained by an X-ray reflectometry (XRR) using a thin film X-ray diffractometer, and a ratio of the measured density to the theoretical density is obtained.
- XRR X-ray reflectometry
- the occupied area ratio of the pores is preferably 1.5 area% or more and 6 area% or less.
- the relative density of the film 23 is preferably 98% or more. It seems that there is no correlation between the occupied area ratio of the pores and the relative density of the film 23. This is because the occupied area ratio of pores is image analysis, whereas the relative density of the film uses XRR. XRR is measured by transmitting X-rays through the film 23. If a place with pores and a place without pores overlap in the X-ray transmission direction, it may be determined that there is no pore. For this reason, the relative density of the film
- the plasma processing apparatus member 21 of the present disclosure hardly generates particles, the plasma processing apparatus including the plasma processing apparatus member 21 is excellent in reliability.
- each first subcomponent powder is weighed.
- the aluminum oxide A powder and the aluminum oxide B powder have a mass ratio of 40:60 to 60:40, and among the 100 mass% of the components constituting the obtained alumina ceramic, Al is Al. Weigh so that the content in terms of 2 O 3 is 99.4% by mass or more to obtain aluminum oxide powder.
- the amount of Na in the aluminum oxide mixed powder is first grasped, and the amount of Na in the case of alumina ceramics is converted to Na 2 O, and this converted value and the first Weighing is performed so that the ratio of the component (in this example, Si, Ca, etc.) constituting the subcomponent powder to a value converted to an oxide is 1.1 or less.
- the slurry is spray-granulated to obtain granules, and then the granules are formed into a predetermined shape by a powder press forming apparatus, an isostatic press forming apparatus, etc., and subjected to cutting as necessary to form a substrate-like formed body Get.
- the surface on the side on which the film 23 is formed has diamond abrasive grains having an average grain size of 1 ⁇ m or more and 5 ⁇ m or less.
- the base material 25 can be obtained by polishing using a polishing disk made of tin.
- FIG. 4 is a schematic diagram showing the sputtering apparatus 40.
- the sputtering apparatus 40 includes a chamber 35, a gas supply source 33 connected to the chamber 35, an anode 34 and a cathode 32 located in the chamber 35, and a cathode 32.
- the target 31 connected to the side is provided.
- the base material 25 obtained by the above-described method is installed on the anode 34 side in the chamber 35. Further, a target 31 mainly composed of a rare earth element, here metal yttrium, is disposed on the cathode 32 side on the opposite side in the chamber 35. In this state, the inside of the chamber 35 is decompressed by the exhaust pump, and argon and oxygen are supplied as the gas G from the gas supply source 33.
- an electric field is applied between the anode 34 and the cathode 32 by a power source to generate plasma P and perform sputtering, thereby forming a metal yttrium film on the surface of the substrate 25.
- the thickness in one formation is sub-nm.
- an oxidation process of the metal yttrium film is performed.
- the plasma of this indication provided with the film
- a member for a processing apparatus can be obtained.
- the area occupation ratio of the plurality of pores is 1.5 area% or more and 6 area% or less
- the area occupation ratio of the pores on the surface of the base material facing the film is 1 area. % Or more and 5 area% or less.
- the average value of the spheroidization rate of the plurality of pores is 60% or more
- the average value of the spheroidization rate of the pores on the surface of the substrate facing the film is 62% or more. Just keep it.
- the kurtosis Ku of the circle equivalent diameter of the plurality of pores is 0.5 or more and 2 or less
- the kurtosis of the circle equivalent diameter of the pores on the surface of the base material facing the film Ku should be 0.6 or more and 1.8 or less.
- the skewness of the circle equivalent diameter of the pores on the surface of the substrate facing the film is obtained. It is sufficient to set Sk to be 3.1 or more and 5.4 or less.
- the oxidation process may be replaced with a fluorination process.
- the formation of the metal yttrium film, the oxidation process and the fluorination process may be alternately performed in this order.
- the oxidation process may be replaced with a nitridation process.
- the power input from the power source may be either high frequency power or direct current power.
- the member for a plasma processing apparatus of the present disclosure obtained by the manufacturing method described above can reduce both the number of particles generated from the inside of pores and the number of particles generated due to the extension of microcracks. It may be a high frequency transmitting window member for transmitting a high frequency for generating, a shower plate for distributing plasma generating gas, a susceptor for mounting a semiconductor wafer, and the like.
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Abstract
Description
気孔の球状化率(%)=(気孔の実面積)/(気孔の最少外接円の面積)×100(1)特に、気孔の球状化率の平均値は62%以上であるとよい。
2:第2層(上層)
3:膜
4:開気孔
5:基材
6:閉気孔
7:凹部
8:空隙部
10:プラズマ処理装置用部材
11:ターゲット
12:陰極
13:ガス供給源
14:陽極
15:チャンバ
20:スパッタ装置
Claims (8)
- 基材と、該基材の少なくとも一部に希土類元素の酸化物、弗化物、酸弗化物または窒化物の膜とを備え、
該膜は、プラズマに曝される表面の開気孔の面積占有率が8面積%以下であるとともに、開気孔の平均径が8μm以下である、プラズマ処理装置用部材。 - 前記膜は、前記開気孔の平均径が8μm以下であるとともに、前記開気孔の面積占有率が8面積%以下である領域が、前記膜の厚みに対し、前記表面から5%以上を占める、請求項1に記載のプラズマ処理装置用部材。
- 前記膜は、前記基材の前記膜との対向面に位置する凹部から厚み方向に伸びる空隙部を備え、前記空隙部の先端は、前記膜内で閉塞されている、請求項1または請求項2に記載のプラズマ処理装置用部材。
- 前記膜の厚み方向に沿って断面視した前記空隙部の幅は、前記基材の凹部側よりも前記膜の表面側の方が狭い、請求項3に記載のプラズマ処理装置用部材。
- 前記希土類元素がイットリウムである、請求項1乃至請求項4のいずれかに記載のプラズマ処理装置用部材。
- 前記基材は、酸化アルミニウムを主成分とするセラミックスからなり、前記膜との対向面上に、イットリウムアルミニウムガーネット(YAG)、イットリウムアルミニウムモノクリニック(YAM)およびイットリウムアルミニウムペロブスカイト(YAP)の少なくともいずれかを含む、請求項5に記載のプラズマ処理装置用部材。
- 請求項1乃至請求項6のいずれかに記載のプラズマ処理装置用部材を備える、プラズマ処理装置。
- 基材上にスパッタ法により酸化イットリウムを主成分とする第1層を形成する工程と、
前記第1層の成膜面を平滑化処理する工程と、
前記平滑化処理された前記第1層における処理面上にスパッタ法により酸化イットリウムを主成分とする第2層を形成する工程とを含む、プラズマ処理装置用部材の製造方法。
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KR1020207027900A KR102488234B1 (ko) | 2018-04-03 | 2019-04-03 | 플라즈마 처리 장치용 부재 및 이것을 구비하는 플라즈마 처리 장치 및 플라즈마 처리 장치용 부재의 제조 방법 |
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TWI704843B (zh) | 2020-09-11 |
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KR102488234B1 (ko) | 2023-01-13 |
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TWI715004B (zh) | 2021-01-01 |
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KR102489368B1 (ko) | 2023-01-17 |
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JP7048726B2 (ja) | 2022-04-05 |
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