WO2005015628A1 - プラズマ処理装置及びアッシング方法 - Google Patents
プラズマ処理装置及びアッシング方法 Download PDFInfo
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- WO2005015628A1 WO2005015628A1 PCT/JP2004/011657 JP2004011657W WO2005015628A1 WO 2005015628 A1 WO2005015628 A1 WO 2005015628A1 JP 2004011657 W JP2004011657 W JP 2004011657W WO 2005015628 A1 WO2005015628 A1 WO 2005015628A1
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- plasma
- chamber
- plasma processing
- gas
- processing apparatus
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- 238000004380 ashing Methods 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 75
- 230000007246 mechanism Effects 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 54
- 239000000463 material Substances 0.000 claims description 36
- 239000006096 absorbing agent Substances 0.000 claims description 10
- 239000001307 helium Substances 0.000 claims description 7
- 229910052734 helium Inorganic materials 0.000 claims description 7
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
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- 210000002381 plasma Anatomy 0.000 description 161
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- 238000005530 etching Methods 0.000 description 21
- 239000011229 interlayer Substances 0.000 description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 230000009849 deactivation Effects 0.000 description 10
- 238000000295 emission spectrum Methods 0.000 description 9
- 239000010408 film Substances 0.000 description 9
- 239000004065 semiconductor Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000003071 parasitic effect Effects 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000009832 plasma treatment Methods 0.000 description 5
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229910021426 porous silicon Inorganic materials 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229920001665 Poly-4-vinylphenol Polymers 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- UMIVXZPTRXBADB-UHFFFAOYSA-N benzocyclobutene Chemical class C1=CC=C2CCC2=C1 UMIVXZPTRXBADB-UHFFFAOYSA-N 0.000 description 1
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- -1 cyclic olefin Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 150000002431 hydrogen Chemical class 0.000 description 1
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- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical class [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000000391 spectroscopic ellipsometry Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L21/31127—Etching organic layers
- H01L21/31133—Etching organic layers by chemical means
- H01L21/31138—Etching organic layers by chemical means by dry-etching
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/42—Stripping or agents therefor
- G03F7/427—Stripping or agents therefor using plasma means only
-
- 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
- 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
- H01J37/32357—Generation remote from the workpiece, e.g. down-stream
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/32—Processing objects by plasma generation
- H01J2237/33—Processing objects by plasma generation characterised by the type of processing
- H01J2237/334—Etching
- H01J2237/3342—Resist stripping
Definitions
- the present invention relates to a plasma processing apparatus and an ashing method, and more particularly to a plasma processing apparatus and a ashing method capable of rapidly removing a resist while suppressing damage to an object to be treated.
- Plasma processing such as plasma etching, dry etching, thin film deposition, or surface modification
- plasma processing is applied to semiconductor manufacturing equipment and liquid crystal display manufacturing equipment, and is widely used in various industrial fields including the electronics industry.
- the “ashing process” which uses a plasma to ash the resist, was used as a mask material for etching for processing fine patterns and for ion implantation (hereinafter, “i-bra”). It is often used as a dry process to remove and decompose resist.
- FIG. 20 is a schematic view showing an example of the “down flow type” atsing device.
- This device comprises: a chamber 110; a transmission window 118 consisting of a flat dielectric plate provided on the upper surface of the chamber 110; a microwave waveguide provided outside the transmission window 118; And a stage 116 for placing and holding an object W such as a semiconductor wafer in the processing space below the transmission window 118.
- the treatment space is depressurized by the vacuum evacuation system E, and then the atmosphere of the treatment gas is formed.
- the microwave M is introduced from the microwave waveguide 120.
- the microwave M energizes the gas in the chamber 110 through the transmission window 118 to form a plasma p of the processing gas.
- ions and electrons collide with molecules of the processing gas to generate excited active species (plasma products) such as excited atoms and molecules and free atoms (radicals).
- plasma products diffuse in the processing space as shown by arrow A and fly to the surface of the object to be processed W, and plasma processing such as etching is performed.
- FIG. 21 is a schematic view showing a main part of a "remote plasma type" plasma processing apparatus disclosed in Japanese Patent Application Laid-Open No. 2001-185005. That is, the plasma transmission tube 130 is connected above the chamber 110, and the processing gas G is supplied from the tip thereof. Further, a microwave waveguide tube 120 is connected to the plasma transmission tube 130 and a microwave M is supplied. The microwave M is given energy to form plasma P of the processing gas G, and active species A such as radicals contained in the plasma P are supplied to the object W of the chamber 110 via the transmission tube 130 By Plasma processing such as atsing is performed.
- insulating films made of “low dielectric constant (low-k) materials” have been attracting attention as one of the elemental technologies for achieving higher integration of semiconductors.
- This is a material used as an interlayer insulating film provided between a plurality of wiring layers and a gate insulating film of an insulating gate type device, and has an advantage that parasitic capacitance can be reduced because the dielectric constant is low.
- these low dielectric constant materials include organic materials such as polyimide and porous silicon oxide.
- the present invention has been made based on the recognition of such problems, and the purpose thereof is, based on an idea different from the conventional one, such as atsing without giving unnecessary damage even when plasma treatment is performed on a low dielectric constant material or the like. It is an object of the present invention to provide a plasma processing apparatus and an ashing method capable of plasma processing. Disclosure of the invention
- a chamber capable of maintaining an atmosphere depressurized from the atmosphere, a transmission pipe connected to the chamber, and a gas introduced into the transmission pipe And a microwave source for introducing microwaves from the outside to the inside of the transmission tube.
- a plasma processing apparatus capable of forming plasma of the gas in the transmission pipe and performing plasma processing of an object installed in the chamber, wherein the transmission pipe is disposed on a main surface of the object. It is connected to be open to the inner wall of the substantially vertical chamber, and the object to be treated is not provided on a straight line viewed from the plasma.
- the remote plasma type plasma processing apparatus reliable plasma processing can be performed while preventing damage to the object to be processed due to light emitted from the plasma.
- the transmission pipe is connected to the inner wall of the chamber with its axis inclined in a direction away from the object to be treated as compared with the case where the transmission pipe is connected substantially perpendicularly to the inner wall of the chamber. If so, the light emitted from the plasma can be further reliably kept away from the object to be treated.
- a second plasma processing apparatus includes a chamber capable of maintaining an atmosphere decompressed from the atmosphere, a transmission pipe connected to the chamber via a substantially L-shaped connecting pipe, and the transmission.
- a gas introduction mechanism for introducing a gas into a pipe; and a microwave source for introducing a microwave from the outside to the inside of the transmission pipe,
- a plasma processing apparatus capable of forming plasma of the gas in the transmission pipe and performing plasma processing of an object installed in the chamber, wherein the connection pipe is formed on the main surface of the object. It is connected so as to open on the inner wall of the substantially opposing chamber, and the inner wall of the connection pipe is made of a fluorine-containing resin. According to the above configuration, in the remote plasma type plasma processing apparatus, reliable plasma processing can be performed while preventing damage to the object to be processed due to light emitted from the plasma.
- a chamber capable of maintaining an atmosphere decompressed from the atmosphere, a transmission window occupying a part of a wall surface of the chamber, and the transmission window via the transmission window
- a microwave source for introducing microwaves from the outside to the inside, and a gas introducing mechanism for introducing a gas into the chamber
- a plasma processing apparatus capable of forming a plasma of the gas in the chamber, and performing a plasma processing of an object to be processed disposed in the chamber, which blocks light emitted from the plasma;
- a light shield for transmitting the emitted active species is provided between the plasma and the object to be treated.
- the uniformity of the plasma processing in the object to be processed can be improved by further comprising rectifying means for adjusting the distribution of the gas flow supplied from the transmission pipe on the object to be processed.
- the ashing method of the present invention is an ashing method for removing the resist of an object to be treated in which a resist is formed on an insulating layer, wherein a plasma containing hydrogen and an inert gas is formed. Active species emitted from the plasma are caused to act on the object to be treated disposed in a chamber capable of maintaining a decompressed atmosphere, and light emitted from the plasma is substantially applied to the object to be treated. And removing the resist in a state where it is not irradiated.
- the inert gas is helium, deterioration of the insulating layer can be prevented.
- the insulating layer is made of a low dielectric constant material, reliable ashing becomes possible while preventing the film thickness of the insulating layer from being reduced and deteriorating.
- FIG. 1 is a conceptual diagram for explaining a plasma processing apparatus and an attaching method according to an embodiment of the present invention
- FIG. 2 is a process cross-sectional view for explaining an experiment conducted by the present inventor
- FIG. 3 is a graph diagram summarizing experimental results of a series of samples
- FIG. 4 is a graph showing the emission spectrum of H 2 (hydrogen).
- FIG. 5 is a graph showing the emission spectrum of He (helium), and FIG. 6 is a graph showing the emission spectrum of N 2 .
- FIG. 7 is a graph showing the emission spectrum of 0 2
- FIG. 8 is a graph showing an emission spectrum of Ar (argon)
- FIG. 9 is a schematic view showing a second specific example of the plasma processing apparatus of the present invention
- FIG. FIG. 11 is a schematic view showing a third example of the plasma processing apparatus of the present invention
- FIG. 11 is a schematic view showing a specific example in which an absorber is provided also on the inner wall of the transmission tube 30.
- FIG. 2 is a schematic view showing a fifth example of the plasma processing apparatus of the present invention
- FIG. 13 is a schematic view showing a specific example in which the inclination of the transmission tube 30 is increased
- FIG. 15 is a schematic view showing a seventh example of the plasma processing apparatus of the present invention
- FIG. 15 is a schematic cross-sectional view showing a specific example of the light shield 70,
- FIG. 16 is a schematic cross-sectional view showing a concrete example in which a plate-like body is formed of a composite material
- FIG. 17 is a schematic cross-sectional view showing a concrete example of a light shielding body 70.
- FIG. 18 is a schematic view showing an eighth specific example of the plasma processing apparatus of the present invention
- FIG. 19 is a schematic view showing a ninth specific example of the plasma processing apparatus of the present invention
- FIG. 20 is a schematic view showing an example of the “down flow type” atsing apparatus
- FIG. 21 is a schematic view showing a main part of a “remote plasma type” plasma processing apparatus.
- FIG. 1 is a conceptual view for explaining a plasma processing apparatus and an ashing method according to an embodiment of the present invention.
- the plasma processing apparatus of this example is also a "remote plasma type" apparatus, and the microwave M is applied to the chamber 10, the transmission pipe 30 provided on the side of the chamber 10, and the transmission pipe 30.
- the microwave M is applied to the chamber 10, the transmission pipe 30 provided on the side of the chamber 10, and the transmission pipe 30.
- the chamber 10 can maintain a reduced pressure atmosphere formed by the vacuum evacuation system E, and a stage 16 for mounting and holding a workpiece W such as a semiconductor wafer is provided near the center of the chamber 10. ing.
- the object to be treated W is not provided on a straight line of sight as viewed from the plasma P. That is, the arrangement of the elements is determined so that the light L emitted from the plasma P is not irradiated to the object W to be processed. That is, when the transmission pipe 30 is connected to the side surface of the chamber 10, the height H from the object W to the transmission pipe 30 and the distance D from the inner wall of the chamber to the generation location of the plasma P are appropriately set. Thus, it is possible to prevent the irradiation of the object W with light emitted from the plasma P. As a result, it is possible to prevent the damage of the object W by the light of the plasma P and perform highly efficient plasma processing.
- the “deactivation” of active species such as radicals generated by plasma P is small. That is, the active species contained in the plasma P are supplied to the surface of the object W along the gas flow G 1. At this time, since “bending” and the like are not formed in the transmission pipe 30, active species collide with the pipe wall etc. The possibility of inactivation due to recombination can be reduced. In other words, rapid plasma processing can be achieved with minimum deactivation of the active species.
- FIG. 2 is a process cross-sectional view for explaining an experiment conducted by the present inventor. That is, the figure is a cross-sectional view showing a part of the manufacturing process of the semiconductor device having the wiring layer of copper (Cu). -
- a lower wiring layer 210 made of copper and an interlayer insulating layer 220 are laminated on a semiconductor layer 200, and a resist 30 is formed on this. Form 0 in a predetermined pattern.
- the interlayer insulating layer 220 in the opening is etched using the resist 300 as a mask to form a via 'hole.
- the resist 300 is removed by ashing, and as shown in FIG. 6D, the upper wiring layer 230 is formed to form a multilayer wiring structure. Is obtained.
- an interlayer insulating layer 2 made of a low dielectric constant material 2 It is possible to rapidly etch the resist 300 while preventing the etching and deterioration of the 20.
- the inventor forms plasma P under the same conditions as ashing, places an insulating layer made of a low dielectric constant material in a chamber without coating resist 300, and etches it. I checked about deterioration.
- a low dielectric constant material a porous S i-O-C 1 H-based compound having the following structural formula was used.
- samples 1 to 3 use H 2 (hydrogen) as an atching gas
- sample 4 uses N 2 (nitrogen) as an atching gas
- sample 5 uses 0 2 (oxygen) as an atching gas.
- Samples 1, 2, 4 and 5 used He (helium) as the inert carrier gas
- Sample 3 used Ar (Argon).
- the sample 2 is subjected to the plasma treatment by the ascending apparatus in which the light from the plasma P is directly irradiated to the object to be treated W.
- the light from the plasma P illuminates the object W.
- Plasma processing was performed using a plasma processing apparatus that was not irradiated.
- the processing time of each sample was set to a time that could remove the 500 nm thick resist by ashing.
- the etching amount of each sample which applied the plasma processing was measured. Furthermore, the surface of the interlayer insulating layer after plasma treatment was evaluated by spectroscopic ellipsometry to measure the thickness of the altered layer.
- the third line is a graph that summarizes the experimental results of a series of samples. That is, the horizontal axis in the figure represents the sample number, and "0" represents the thickness of the interlayer insulating layer not subjected to plasma treatment. Further, the vertical axis in the figure represents the thickness A after plasma treatment, the thickness B of the deteriorated layer formed on the surface, and the etched thickness C for each sample.
- the etching amount of the interlayer insulating layer reaches about 18% of the initial film thickness.
- the plasma processing apparatus of the present invention (Sample 1), it can be seen that the etching amount is suppressed to several percent or less.
- the plasma processing apparatus of the present invention when used, the decrease in the thickness of the interlayer insulating layer 220, that is, the increase in the parasitic capacitance can be suppressed minutely.
- the reason why the interlayer insulating layer of the low dielectric constant material is etched in the conventional ashing device is that the light emitted from the plasma P promotes the decomposition of the low dielectric constant material. .
- UV light having a wavelength of about 100 nm or less is emitted from H 2 and H 2 plasmas P.
- Such ultraviolet light is a low dielectric constant material, ie, an organic material, It is speculated that it has an effect of breaking the bond between elements such as porous silicon oxide doped with carbon and the like. Therefore, it is thought that when such low-k materials are irradiated with such ultraviolet rays, the bonds between the constituent elements are destabilized, and the presence of hydrogen (H) radicals promotes the separation from the matrix.
- the arrangement relation is realized such that the light from the plasma P is not irradiated to the object W to be treated.
- etching of the insulating layer due to irradiation of light such as ultraviolet light can be suppressed, and a reduction in film thickness can be prevented.
- the etching amount of low dielectric constant material is less than a few percent in both cases, but when argon (A r) is used as inert carrier gas (sample 3), the surface is There is a tendency for the thickness B of the altered layer to slightly increase. Further, even with the visual observation, no change was observed on the surface of sample 1, while the surface of sample 3 was observed to be brownish. Since the dielectric constant tends to increase due to the formation of such an altered layer, it is preferable to use helium as the inert carrier gas than argon.
- the number and intensity of emission spectrum lines in the ultraviolet wavelength region are larger for N 2 and 0 2 than for H 2 as the ashing gas, and the emission intensity is high.
- the light from plasma P is not completely blocked In such a case, the etching promoting effect of the low dielectric constant material by the ultraviolet light is likely to occur.
- FIG. 8 is a graph showing the emission spectrum of Ar (argon). Compared to FIG. 5, it can be seen that A r emits more light in the ultraviolet wavelength range than H e (helium). Therefore, in this case as well, the light from the plasma P is not completely shielded, and in this case, there is a high possibility that the ultraviolet radiation can accelerate the etching of the low dielectric constant material. Therefore, if the light from the plasma P is not completely shielded, there is a high possibility that the ultraviolet radiation may accelerate the etching of the low dielectric constant material. ,
- Atsushingugasu not to desired to use of H 2 than N 2 and 0 2. Also, it is preferable to use He as the inert carrier gas rather than using Ar.
- the present invention can be used not only for the specific low dielectric constant material described above, but also for various other low dielectric constant materials to obtain the same function and effect.
- the low dielectric constant material to which the present invention can be applied is used particularly as a gate insulating film or an interlayer insulating film in a semiconductor integrated circuit, and has a dielectric constant of 3.5 or less.
- Typical examples are polyimides, benzocyclobutenes, norylenes, fluorocarbons, silicon oxides containing carbon, and porous bodies of these.
- the resist that can be attacked has a sensitivity corresponding to an exposure light source such as g-line, i-line, wavelength of 15 7 nm, wavelength 'of 1 93 nm, etc. frequently used in semiconductor manufacturing processes, for example Examples include those containing nopolac, polyvinylphenol, atarilate, cyclic olefin and the like.
- an exposure light source such as g-line, i-line, wavelength of 15 7 nm, wavelength 'of 1 93 nm, etc. frequently used in semiconductor manufacturing processes, for example Examples include those containing nopolac, polyvinylphenol, atarilate, cyclic olefin and the like.
- Both the low dielectric constant material and the resist are not limited to the above specific examples, and all materials which can be appropriately selected and used by those skilled in the art can be applied.
- FIG. 9 is a schematic view showing a second specific example of the plasma processing apparatus of the present invention.
- symbol is attached
- a rectifier 50 is provided around the stage 16.
- the adjustment fluid 50 has the function of adjusting the flow of the processing gas G. That is, when the transmission pipe 30 is connected to the side surface of the chamber 10 in order to prevent the object W to be irradiated with light emitted from the plasma P, the flow of the gas flowing toward the evacuation means E is the object to be processed. It is asymmetric when viewed from W. For this reason, there is a possibility that the rates of plasma processing such as etching and etching have a distribution in a plane and become uneven in the object W to be processed.
- the rectifying body 50 is provided around the stage 16 so that it is possible to correct the non-uniformity on the surface of the object to be processed W.
- the rectifying body 50 is provided with the openings 5 0 a and 5 O b, and the opening 5 0 a on the side far from the transmission pipe 3 0 and the opening 5 0 b on the side close to the transmission pipe 3 0
- the gas flow G 1 reaching the far side from the transmission tube 30 is increased more than the gas flow G 2 on the near side, and uniform plasma processing is performed. It is possible to
- the distribution of the gas flow with respect to the object to be processed W is simultaneously controlled while preventing the light emission L from the plasma P being irradiated to the object to be processed W, and the plasma processing is uniform. It is possible to improve the sex.
- the structure of the rectifying body 50 provided to improve the uniformity of plasma processing is not limited to that shown in FIG. 9.
- Other structures can be used. Ru.
- FIG. 10 is a schematic view showing a third example of the plasma processing apparatus of the present invention.
- the same symbols are given to the same elements as what were mentioned above with reference to FIG. 1 through FIG. 9 about this figure, and detailed explanation will be omitted.
- an absorber 60 for absorbing the light L from the plasma P is provided on the inner wall of the chamber 10.
- an absorber 60 By providing such an absorber 60, the light L from the plasma P is absorbed by the inner wall of the chamber 10, so that the object W to be treated can be prevented from being irradiated. As a result, the influence of the light L from the plasma P can be more reliably suppressed.
- the material and structure of the absorber 60 can be appropriately determined according to the wavelength of the light L from the plasma P.
- the light L from the plasma P is ultraviolet light
- various inorganic materials, metal materials, organic materials or composite materials thereof that absorb the light can be used.
- Such an absorber 60 may also be provided on the inner wall of the transmission pipe 30 as illustrated in FIG. In this way, the reflection of the light L on the inner wall of the transmission tube 30 can be prevented, and the irradiation of the light L to the object to be treated W can be blocked more reliably.
- FIG. 12 is a schematic view showing a fifth example of the plasma processing apparatus of the present invention.
- the same symbols are given to the same elements as what were mentioned above with reference to FIG. 1 through FIG. 11 also about the same figure, and detailed explanation will be omitted.
- the transmission pipe 30 is connected obliquely to the side of the chamber 10. That is, the transmission pipe 30 is connected with its central axis inclined in a direction away from the object W to be processed. In this way, by moving the light L from the plasma P away from the object W, the object W can be more reliably prevented from being irradiated.
- the effect of shielding the light L of the plasma P becomes higher as the inclination of the transmission tube 30 is larger, as illustrated in FIG. That is, as shown in FIG. 13, the light L from the plasma P can be further moved away from the object W by connecting the transmission tube 3 0 to the chamber 10 by tilting the transmission tube 3 0 further. Also in such a case, active species such as radicals are supplied to the surface of the object to be treated W without being inactivated along the gas flow G 1 because “bends” etc. are not formed in the transmission pipe 30. Be done.
- FIG. 14 is a schematic view showing a seventh example of the plasma processing apparatus of the present invention.
- the same symbols are given to the same elements as what were mentioned above with reference to FIGS. 1 to 13 also about the same figure, and detailed explanation will be omitted.
- a light shield 70 is provided near the open end of the transmission tube 30.
- the light shield 70 has a function of blocking the light L emitted from the plasma P and transmitting active species such as radicals. By providing such a light shield 70, it is possible to prevent damage to the object W to be treated due to the irradiation of the light L.
- FIG. 15 is a schematic cross-sectional view showing a specific example of the light shield 70.
- the light shield 70 A of this example a plurality of plate-like bodies are arranged in a louver like a blind.
- the light L from the plasma P is blocked by these plates and does not reach the object W to be treated.
- the active species released from the 'plasma P flow along the gas flow G 1 through the gaps of the plate-like material and are supplied to the surface of the object W to be treated.
- the plate-like body may be formed of a material which is unlikely to cause recombination of the active species.
- a radical recombination rate in the case of a metal such as stainless steel, it is approximately 0.1 to 0.2.
- the degree In the case of alumina or quartz, the degree is about 0.000 to 0.10.
- Teflon registered trademark
- Tefgon registered trademark
- the plate-like body constituting the light shield 70 or the surface thereof is formed of the absorber 60 described above with reference to FIGS. 10 and 11. Good to do.
- FIG. 16 is a schematic cross-sectional view showing a specific example in which a plate-like body is formed of a composite material. That is, one surface of the plate-like body constituting the light shield 7 0 B of this example is formed by the first layer 7 OB a, and the other surface is formed by the second layer 7 0 B b. ing.
- the first layer 70 B a is disposed on the incident side of the gas flow G 1 and is made of a material that suppresses radical deactivation.
- the second layer 70 B b is disposed on the back side thereof and is made of a material that absorbs light L.
- the light L reflected by the plate-like member can be reliably absorbed by the second layer 70 B b and blocked from the object W as exemplified by the arrow L 1.
- an absorption layer of the light L may be provided on the incident side of the gas flow G 1, and a layer for preventing the deactivation of the active species may be provided on the absorption layer.
- FIG. 17 is a schematic cross-sectional view showing a specific example of the light shielding body 70.
- the light shield 70 C of this example is a baffle-like structure having a plurality of baffles provided with openings.
- the openings of the respective baffles are formed so as not to overlap each other. Even in such a light shield 70 C, light L from the plasma P is blocked by these baffles and does not reach the object W to be processed.
- the active species released from the plasma P flow through the opening along the gas flow G 1 and are supplied to the surface of the object W to be treated.
- one side of the baffle is formed of a layer that suppresses the deactivation of the radical, and the other side is formed of a layer that absorbs light L. You may make it. In this way, the light L can be absorbed more reliably, and at the same time the deactivation of the active species can be prevented.
- FIG. 18 is a schematic view showing an eighth example of the plasma processing apparatus of the present invention.
- the same symbols are given to the same elements as what were mentioned above with reference to FIG. 1 through FIG. 17 also about the same figure, and detailed explanation will be omitted.
- the transmission pipe 30 is connected to the upper surface of the chamber 10 through a connecting pipe 30 L ⁇ bent in a substantially L shape.
- the active species released from the plasma P are supplied directly above the object to be processed W via the transmission pipe 30 and the connecting pipe 30 L.
- the connecting tube 30 L bent substantially at right angles it is possible to shield the object to be processed W by shielding the light L emitted from the plasma P.
- the connecting tube 30 L is formed of a material that is unlikely to cause recombination of active species. Specifically, it is formed of a fluorine-containing resin such as Teflon (registered trademark). In this way, it is possible to block the light L and at the same time prevent the deactivation of the active species.
- a rectifying body 50 as described above with reference to FIG. 9 may be provided, and as described above with reference to FIGS. 10 and 11, an absorber 60 for light L may be provided. Also, as described above with reference to FIGS. 14 to 17, a light shield 70 may be provided.
- FIG. 19 is a schematic view showing a ninth example of the plasma processing apparatus of the present invention.
- the same symbols are given to the same elements as what were mentioned above with reference to FIGS. 1 to 18 also about the same figure, and detailed explanation will be omitted.
- This specific example is a "down flow type" plasma processing apparatus.
- This device comprises a chamber 10, a transmission window 18 comprising a flat dielectric plate provided on the upper surface of the chamber 10, and a microphone waveguide provided outside the transmission window 18. 2 0, Transparent window 1
- the processing object W such as semiconductor wafer is placed and held in the processing space below 8 To have stage 16 and
- the chamber 10 can maintain a reduced pressure atmosphere formed by the vacuum evacuation system E, and is appropriately provided with a gas introduction pipe (not shown) for introducing a processing gas into the processing space.
- the object W is placed on the stage 16 with the surface facing upward. Ru.
- an etching gas as a processing gas is introduced into the processing space.
- the microwave M is introduced from the microwave waveguide 20 to the slot antenna 20 S with the atmosphere of the processing gas being formed in the processing space.
- the microwave M is emitted from the slot antenna 2 0 S toward the transmission window 18.
- the transmission window 18 is made of a dielectric such as quartz or alumina, and the microwave M propagates on the surface of the transmission window 18 and is emitted to the processing space in the chamber 10.
- the energy of the microwave M radiated to the processing space in this manner forms a plasma of the processing gas.
- the microwaves from the lower surface of the transmission window 18 The beam is reflected until a certain distance (skin debs) d enters the processing space of the chamber, and a microwave standing wave is formed between the microwave reflection surface and the lower surface of the slot antenna 20 S. Ru.
- the reflecting surface of the microwave becomes a plasma excitation surface, and stable plasma P is excited on this plasma excitation surface.
- stable plasma P excited on this plasma excitation surface ions and electrons collide with the molecules of the processing gas, whereby excited active species (such as excited atoms, molecules, free atoms (radicals), etc. The product is produced.
- excited active species such as excited atoms, molecules, free atoms (radicals), etc.
- the product is produced.
- These plasma products diffuse in the processing space as shown by arrow A and fly to the surface of the object to be processed W, and plasma processing such as etching is performed.
- a light shield 70 is provided between the plasma P and the object W.
- the light shield 70 is formed, for example, in the shape of a looper or a puffle, as described above with reference to FIGS.
- a rectifying body 50 as described above with reference to FIG. 9 may be provided, and as described above with reference to FIGS. 10 and 11, an absorber 60 for light L may be provided.
- an absorber 60 for light L may be provided.
- ADVANTAGE OF THE INVENTION it becomes possible to implement a rapid and reliable plasma processing, preventing damage to the to-be-processed object by the light discharge
- it becomes possible to stably manufacture for example, a multilayer wiring structure or an insulated gate type device using a low dielectric constant material, and the industrial merit is great.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/567,665 US7491908B2 (en) | 2003-08-12 | 2004-08-06 | Plasma processing device and ashing method |
EP04771632A EP1655770A4 (en) | 2003-08-12 | 2004-08-06 | PLASMA PROCESSING DEVICE AND INCINERATION METHOD |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-207379 | 2003-08-12 | ||
JP2003207379A JP2005064037A (ja) | 2003-08-12 | 2003-08-12 | プラズマ処理装置及びアッシング方法 |
Publications (1)
Publication Number | Publication Date |
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WO2005015628A1 true WO2005015628A1 (ja) | 2005-02-17 |
Family
ID=34131427
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/011657 WO2005015628A1 (ja) | 2003-08-12 | 2004-08-06 | プラズマ処理装置及びアッシング方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US7491908B2 (ja) |
EP (1) | EP1655770A4 (ja) |
JP (1) | JP2005064037A (ja) |
KR (2) | KR100895253B1 (ja) |
CN (1) | CN100466193C (ja) |
TW (1) | TW200522198A (ja) |
WO (1) | WO2005015628A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100279512A1 (en) * | 2007-11-14 | 2010-11-04 | Tokyo Electron Limited | Plasma processing apparatus and method for plasma-processing semiconductor substrate |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050284573A1 (en) * | 2004-06-24 | 2005-12-29 | Egley Fred D | Bare aluminum baffles for resist stripping chambers |
JP5236225B2 (ja) * | 2007-07-31 | 2013-07-17 | ルネサスエレクトロニクス株式会社 | 半導体集積回路装置の製造方法 |
US8741778B2 (en) * | 2010-12-14 | 2014-06-03 | Applied Materials, Inc. | Uniform dry etch in two stages |
US10049881B2 (en) | 2011-08-10 | 2018-08-14 | Applied Materials, Inc. | Method and apparatus for selective nitridation process |
JP5780928B2 (ja) * | 2011-11-22 | 2015-09-16 | 株式会社アルバック | プラズマ処理装置 |
WO2015171335A1 (en) * | 2014-05-06 | 2015-11-12 | Applied Materials, Inc. | Directional treatment for multi-dimensional device processing |
WO2017160649A1 (en) * | 2016-03-13 | 2017-09-21 | Applied Materials, Inc. | Methods and apparatus for selective dry etch |
US11694911B2 (en) * | 2016-12-20 | 2023-07-04 | Lam Research Corporation | Systems and methods for metastable activated radical selective strip and etch using dual plenum showerhead |
US20200126769A1 (en) * | 2018-10-23 | 2020-04-23 | Hzo, Inc. | Plasma ashing of coated substrates |
US20220223383A1 (en) * | 2019-04-05 | 2022-07-14 | Applied Materials, Inc. | Process system with variable flow valve |
US11508573B2 (en) * | 2019-12-31 | 2022-11-22 | Micron Technology, Inc. | Plasma doping of gap fill materials |
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- 2004-08-06 KR KR1020067002878A patent/KR100835630B1/ko active IP Right Grant
- 2004-08-06 WO PCT/JP2004/011657 patent/WO2005015628A1/ja active Application Filing
- 2004-08-06 EP EP04771632A patent/EP1655770A4/en not_active Withdrawn
- 2004-08-06 CN CNB2004800261699A patent/CN100466193C/zh active Active
- 2004-08-06 US US10/567,665 patent/US7491908B2/en not_active Expired - Fee Related
- 2004-08-12 TW TW093124253A patent/TW200522198A/zh unknown
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Also Published As
Publication number | Publication date |
---|---|
TWI303850B (ja) | 2008-12-01 |
CN1849701A (zh) | 2006-10-18 |
JP2005064037A (ja) | 2005-03-10 |
KR100895253B1 (ko) | 2009-04-29 |
KR100835630B1 (ko) | 2008-06-09 |
KR20080036157A (ko) | 2008-04-24 |
US20070151956A1 (en) | 2007-07-05 |
EP1655770A4 (en) | 2009-01-14 |
EP1655770A1 (en) | 2006-05-10 |
US7491908B2 (en) | 2009-02-17 |
KR20060038468A (ko) | 2006-05-03 |
CN100466193C (zh) | 2009-03-04 |
TW200522198A (en) | 2005-07-01 |
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