WO2006118271A1 - エッチング方法、低誘電率誘電体膜の製造方法、多孔性部材の製造方法並びにエッチング装置及び薄膜作製装置 - Google Patents
エッチング方法、低誘電率誘電体膜の製造方法、多孔性部材の製造方法並びにエッチング装置及び薄膜作製装置 Download PDFInfo
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- WO2006118271A1 WO2006118271A1 PCT/JP2006/309034 JP2006309034W WO2006118271A1 WO 2006118271 A1 WO2006118271 A1 WO 2006118271A1 JP 2006309034 W JP2006309034 W JP 2006309034W WO 2006118271 A1 WO2006118271 A1 WO 2006118271A1
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- Prior art keywords
- etching
- temperature
- halogen
- etched
- noble metal
- Prior art date
Links
- 238000005530 etching Methods 0.000 title claims abstract description 317
- 238000000034 method Methods 0.000 title claims abstract description 156
- 239000010408 film Substances 0.000 title claims description 81
- 239000010409 thin film Substances 0.000 title claims description 54
- 238000004519 manufacturing process Methods 0.000 title claims description 42
- 239000013078 crystal Substances 0.000 claims abstract description 111
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 109
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 86
- 230000008569 process Effects 0.000 claims abstract description 81
- 239000002243 precursor Substances 0.000 claims abstract description 78
- 239000000758 substrate Substances 0.000 claims abstract description 71
- 150000002367 halogens Chemical class 0.000 claims abstract description 45
- 238000001179 sorption measurement Methods 0.000 claims description 60
- 230000015572 biosynthetic process Effects 0.000 claims description 33
- 229910052751 metal Inorganic materials 0.000 claims description 31
- 239000002184 metal Substances 0.000 claims description 31
- 230000004907 flux Effects 0.000 claims description 14
- 229910052741 iridium Inorganic materials 0.000 claims description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 10
- 230000005284 excitation Effects 0.000 claims description 9
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 230000008021 deposition Effects 0.000 claims 1
- 238000007788 roughening Methods 0.000 claims 1
- 239000013077 target material Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 70
- 239000000460 chlorine Substances 0.000 description 43
- 229910052801 chlorine Inorganic materials 0.000 description 41
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 26
- 238000005755 formation reaction Methods 0.000 description 24
- 238000010586 diagram Methods 0.000 description 12
- 239000010949 copper Substances 0.000 description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000000919 ceramic Substances 0.000 description 9
- 238000005229 chemical vapour deposition Methods 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 5
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 5
- 239000010970 precious metal Substances 0.000 description 5
- 150000004820 halides Chemical class 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- -1 that is Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 3
- DANYXEHCMQHDNX-UHFFFAOYSA-K trichloroiridium Chemical compound Cl[Ir](Cl)Cl DANYXEHCMQHDNX-UHFFFAOYSA-K 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- UBHZUDXTHNMNLD-UHFFFAOYSA-N dimethylsilane Chemical compound C[SiH2]C UBHZUDXTHNMNLD-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 208000018459 dissociative disease Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 1
- UIUXUFNYAYAMOE-UHFFFAOYSA-N methylsilane Chemical compound [SiH3]C UIUXUFNYAYAMOE-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67017—Apparatus for fluid treatment
- H01L21/67063—Apparatus for fluid treatment for etching
- H01L21/67069—Apparatus for fluid treatment for etching for drying etching
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
- C23C16/06—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 deposition of metallic material
- C23C16/08—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 deposition of metallic material from metal halides
- C23C16/14—Deposition of only one other metal element
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
- C23C16/448—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 generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials
- C23C16/4488—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 generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials by in situ generation of reactive gas by chemical or electrochemical reaction
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
- C23C16/56—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F4/00—Processes for removing metallic material from surfaces, not provided for in group C23F1/00 or C23F3/00
-
- 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
- H01J37/32082—Radio frequency generated discharge
- H01J37/321—Radio frequency generated discharge the radio frequency energy being inductively coupled to the plasma
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—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
- H01L21/31105—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
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32135—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only
- H01L21/32136—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only using plasmas
Definitions
- Etching method low dielectric constant dielectric film manufacturing method, porous member manufacturing method, etching apparatus and thin film manufacturing apparatus
- the present invention relates to a novel etching method, an etching apparatus and a thin film manufacturing apparatus that can be used for the method.
- the present invention also relates to a method for producing a low dielectric constant dielectric film using a novel etching method and a method for producing a porous member.
- a plasma CVD device is a gas reaction such as an organometallic complex that forms a film material introduced into a chamber, which is converted into a plasma state by a high frequency incident from a high frequency antenna, and a chemical reaction on the substrate surface by active excited atoms in the plasma. Is a device for forming a metal thin film or the like by promoting the above.
- the inventors of the present invention installed a member to be etched, which is a metal component for producing a high vapor pressure halide and has a metal component force desired to form a film, into a halogen gas to make it a plasma.
- a plasma CVD apparatus (hereinafter referred to as a new plasma CVD apparatus) that forms a precursor, which is a metal component halide, by etching the member to be etched with radicals of nitrogen, and deposits only the metal component of the precursor on the substrate. ) And a film-forming method were developed (for example, see Patent Document 1 below).
- Patent Document 1 Japanese Patent Laid-Open No. 2003-147534
- the metal film is formed on the substrate by controlling the temperature of the substrate to be lower than the temperature of the target serving as a metal source to be formed. For example, if the target metal is M and the halogen gas is C1, the target is heated to a high temperature (for example, 3
- the metal (M) thin film can be formed on the substrate by controlling the substrate at a temperature of 00 ° C. to 700 ° C. and a low temperature (eg, about 200 ° C.). This is thought to be due to the following reactions. [0006] (1) Plasma dissociation reaction; CI ⁇ 2C1 *
- C1 * represents a C1 radical
- (g) represents a gas state
- (ad) represents an adsorption state
- the film forming reaction is appropriately performed by maintaining an appropriate ratio of MC1 and C1 *.
- the ratio of MC1 and C1 * can be controlled to be almost equal, and without reducing the film formation rate, Metal (M) is deposited on the substrate without excessive etching due to C1 *.
- the present invention has been made in view of the above situation, and an object of the present invention is to provide an etching method using the above-described new CVD method, and an etching apparatus and a thin film manufacturing apparatus applicable thereto.
- the present inventor has found that by applying the above-described new CVD technique, by using a predetermined target, very fine anisotropic etching is possible, and the present invention has been completed. Further, by using this etching technique, it is possible to form micropores with a high aspect ratio, to form a low dielectric constant member having a desired dielectric constant, and to form a porous material having a desired porosity. It was found that it can be manufactured.
- a large scale integrated circuit is composed of a transistor, a plurality of wiring layers, and an interlayer insulating film.
- the interlayer insulating film has a low dielectric constant for speeding up and reducing loss. It is known to be better.
- an organic silane-based gas such as monomethylsilane (SiH 2 CH 3), dimethylsilane [(CH 3) SiH;)] and N 2 O or
- SiH4 and O are mixed with He when SiO is formed by CVD.
- a method of forming a film with a low dielectric constant material such as a method of forming a film by applying and baking an organic film is known.
- a thin film filter having a porous ceramic force is conventionally used for a gas filter, a catalyst filter, etc.
- a problem that regeneration is difficult due to the adsorptivity of the ceramic itself. Can be used to provide a porous material that eliminates these problems.
- a first aspect of the present invention based on such knowledge is obtained from a halogen radical obtained by converting halogen into plasma, a noble metal component obtained by etching a noble metal member with the halogen radical, and halogen. And an adsorption step of adsorbing the crystal nuclei having the precursor force on the member to be etched, and the portion of the member to be etched adsorbed by the crystal nuclei is anisotropic in the thickness direction by the halogen radicals.
- An etching method comprising performing an etching step of etching.
- the adsorption step of adsorbing crystal nuclei as a precursor force on the member to be etched, and the portion of the member to be etched on which the crystal nuclei are adsorbed in the thickness direction with the halogen radicals By performing an anisotropic etching process For example, fine holes with a high aspect ratio can be formed.
- a second aspect of the present invention is the etching method according to the first aspect, wherein a flux ratio between the precursor and the halogen radical is changed between the adsorption step and the etching step, and the adsorption is performed.
- the precursor flux is controlled to be excessive in the step, while the halogen radical is controlled to be excessive in the etching step.
- the precursor flux so as to be excessive in the adsorption step, it is possible to efficiently adsorb crystal nuclei as precursor power on the member to be etched.
- the halogen radicals in the etching process, by controlling the halogen radicals to be excessive, the portion where the crystal nuclei of the member to be etched are adsorbed can be efficiently anisotropically etched with the halogen radicals in the thickness direction.
- a third aspect of the present invention is the etching method according to the first or second aspect, wherein the temperature of the member to be etched is changed between the adsorption step and the etching step, and in the adsorption step, While the temperature is set such that the crystal nuclei are adsorbed on the member to be etched, the etching process is performed at a higher temperature than the adsorption process so that the crystal nuclei are not adsorbed and etching with the halogen radical is promoted.
- the etching method is characterized by being controlled to be
- the adsorption of crystal nuclei is efficiently generated in the adsorption process, and the adsorption is not performed in the etching process! To be promoted.
- a fourth aspect of the present invention in the etching method according to any one of the first to third aspects, when the noble metal member is etched with the halogen radical, the size of the crystal nucleus is increased.
- a force for changing the temperature of the noble metal member to a high temperature side in order to control whether the temperature of the noble metal member is changed to a low temperature side in order to reduce the size of the crystal nucleus. is there.
- a fifth aspect of the present invention is the etching method according to any one of the first to fourth aspects, wherein the precious metal force is S iridium (Ir) or platinum (Pt). Is in the way.
- the fifth aspect it is possible to adsorb a crystal nucleus of a precursor composed of Ir or Pt and halogen, and to etch a region where the crystal nucleus is adsorbed.
- a sixth aspect of the present invention is the etching method according to any one of the first to fifth aspects, wherein the crystal nuclei are adsorbed discontinuously in a predetermined etching region of the member to be etched.
- the etching method is characterized by the above.
- micropores can be formed discontinuously in the etching region. it can.
- a seventh aspect of the present invention is the etching method according to the sixth aspect, wherein the etching target member has the crystal nucleus adsorbed on the outermost surface of the etching region as compared with other regions. It is an etching method characterized in that it becomes easy.
- the crystal nuclei relatively easily adsorbed in the etching region, for example, fine holes with a high aspect ratio can be selectively formed in the etching region.
- An eighth aspect of the present invention is the etching method according to any one of the first to seventh aspects, wherein the crystal nuclei are selectively adsorbed on a portion irradiated with an excitation beam. And an etching method.
- a high-aspect-ratio micropore can be formed at a desired location by selectively adsorbing crystal nuclei to the portion irradiated with the excitation beam.
- the surface of the member to be etched is roughened by the anisotropic etching.
- the etching method is as follows.
- the surface of the member to be etched can be roughened by anisotropic etching, and adhesion to a film formed thereon can be improved.
- a tenth aspect of the present invention is the etching method according to any one of the first to eighth aspects.
- the thin film formed on the outermost surface of the substrate is used as the member to be etched, and at least one through hole penetrating the thin film is formed by the anisotropic etching.
- a through-hole penetrating the thin film can be formed by anisotropic etching.
- the etching method described in any one of the first to eighth aspects is used, and a dielectric film formed on the outermost surface of the substrate is used as the etching target.
- a low dielectric constant dielectric film manufacturing method is characterized in that a low dielectric constant dielectric film is obtained by anisotropic etching to such an extent that it does not penetrate in the thickness direction.
- a low dielectric constant dielectric film can be obtained by using a dielectric film as an object to be etched.
- the etching method described in any one of the first to eighth aspects is used, and a plate-like member is the etching target, and penetrates in the thickness direction of the plate-like member.
- a method for producing a porous member comprising obtaining a porous member having a large number of through holes.
- a porous member can be obtained by using a plate-like member as an etching target and forming a large number of through holes.
- a chamber in which a member to be etched is accommodated, halogen radical supply means for supplying halogen radicals obtained by converting halogen into plasma, and halogen converted into plasma
- Precursor supply means for supplying a precursor comprising a noble metal component and halogen obtained by etching a noble metal member with halogen radicals to the chamber, a flux ratio of the precursor to the halogen radicals, a temperature of the target, and An adsorption step of adsorbing crystal nuclei made of the precursor on the etching target member by controlling at least one of the temperatures of the etching target member; and a portion of the etching target member where the crystal nuclei are adsorbed Execute an etching process that performs anisotropic etching in the thickness direction with radicals Lying in the etching apparatus according to claim comprising a Etsuchin grayed control means for controlled so.
- the flux ratio between the precursor and the halogen radical and the target An adsorption process for adsorbing crystal nuclei as a precursor force on the etching target member by controlling at least one of the temperature of the etching target member and the temperature of the etching target member; and a portion of the etching target member where the crystal nucleus is adsorbed
- an etching step of anisotropically etching in the thickness direction with the halogen radical for example, it is possible to provide an apparatus capable of forming a fine hole with a high aspect ratio.
- a noble metal member disposed at a position where the member to be etched is opposed to the chamber, and the interior of the chamber.
- a working gas supply means for supplying a working gas containing halogen; and plasmaizing the inside of the chamber to generate a working radical plasma to generate a halogen radical, and etching the noble metal member with the halogen radical.
- the working gas plasma generating means for generating a precursor composed of a noble metal component and halogen constitutes the halogen radical supply means and the precursor supply means, while the temperature of the noble metal member and the etching target member Etching temperature control means for controlling the temperature, respectively, and the etching control means includes the etching temperature.
- the control means controls the temperature of the etching target member to a low temperature side so as to adsorb the crystal nuclei as the precursor force on the etching target member, and executes the adsorption step.
- the etching process is performed by controlling the temperature of the member to be etched to a high temperature side so that the portion where the crystal nuclei are adsorbed is anisotropically etched in the thickness direction with the halogen radicals. It is in the etching device.
- the temperature of the member to be etched is changed by the etching temperature control means so that the adsorption of crystal nuclei occurs efficiently in the adsorption process, and the adsorption is performed in the etching process.
- the etching should be promoted.
- a fifteenth aspect of the present invention is the etching apparatus according to the fourteenth aspect, wherein the etching control means uses the etching temperature control means to etch the noble metal member with the halogen radical.
- the temperature of the noble metal member is changed to a high temperature side, and in order to reduce the size of the crystal nucleus, the temperature of the noble metal member is changed to a low temperature side. Special In the etching apparatus.
- the temperature of the noble metal member is controlled by the etching temperature control means to control the temperature of the noble metal member when the noble metal member is etched with a halogen radical, and to increase the size of the crystal nucleus.
- the etching temperature control means to control the temperature of the noble metal member when the noble metal member is etched with a halogen radical, and to increase the size of the crystal nucleus.
- a sixteenth aspect of the present invention includes a chamber in which an etching and film formation target member is accommodated, a film formation metal member provided in the chamber at a position where the etching and film formation target member faces, Working gas supply means for supplying a working gas containing halogen to the inside of the chamber, and plasmaizing the inside of the chamber to generate a working gas plasma to generate halogen radicals. From a metal component obtained by reducing the precursor with the halogen radical, working gas plasma generating means for generating a precursor comprising a metal component and halogen contained in the film-forming metal member by etching the member The temperature of the substrate is controlled to be lower than the temperature of the member to be etched so that a thin film is formed on the substrate.
- halogen radicals obtained by converting halogen into plasma are supplied to the upper part of the etching and film formation target member in the chamber, and halogen is converted into plasma.
- Precursor supply means for supplying a precursor composed of a noble metal component obtained by etching a noble metal member with a halogen radical and a halogen above the etching and film formation target member in the chamber;
- Etching temperature control means for controlling the temperature and the temperature of the etching and film formation target member respectively, and the flux ratio between the precursor and the halogen radical, the temperature of the target and the temperature of the etching target member are reduced. Both are controlled on the etching and film formation target member.
- An adsorption process for adsorbing crystal nuclei as a precursor force, and an etching process for anisotropically etching the portion where the crystal nuclei of the film forming target member are adsorbed in the thickness direction with the halogen radicals are performed.
- an etching control means for controlling the thin film forming apparatus for controlling the thin film forming apparatus.
- the metal film member is etched with halogen radicals.
- a precursor composed of a metal component and halogen contained in the film-forming metal member By forming a precursor composed of a metal component and halogen contained in the film-forming metal member, a thin film having a metal component force obtained by reducing the precursor with a halogen radical can be formed on the substrate.
- an adsorption process for adsorbing crystal nuclei that also have a precursor force on the member to be etched, and etching for anisotropically etching the portion of the member to be etched on which the crystal nuclei are adsorbed in the thickness direction with the halogen radical By performing the process, for example, it is possible to provide a thin film manufacturing apparatus capable of forming a fine hole with a high aspect ratio
- the etching control means is configured to cause the precursor force on the etching and film formation target member by the etching temperature control means.
- the temperature of the etching and film formation target member is controlled to a low temperature side so as to adsorb the crystal nucleus, and the adsorption step is executed, and the portion of the etching and film formation target member where the crystal nucleus is adsorbed is
- a thin film manufacturing apparatus having a function of controlling the temperature of the etching and film formation target member to a high temperature side so as to perform anisotropic etching in the thickness direction with a halogen radical and executing the etching process is there.
- the etching temperature control means by changing the temperature of the member to be etched by the etching temperature control means, adsorption of crystal nuclei is efficiently generated in the adsorption step, and adsorption is performed in the etching step.
- the etching should be promoted.
- the etching control means etches the noble metal member with the no- or rogen radicals by the etching temperature control means.
- the temperature of the noble metal member is changed to a high temperature side, and in order to reduce the size of the crystal nucleus, the temperature of the noble metal member is changed to a low temperature side.
- the thin film manufacturing apparatus is characterized by having a function of causing
- the temperature of the noble metal member is controlled by the etching temperature control means when the noble metal member is etched with a halogen radical, so that the size of the crystal nucleus is increased.
- the temperature of the noble metal member can be changed to the low temperature side in order to change the temperature to the high temperature side and reduce the size of the crystal nucleus.
- the present invention applies a new type of CVD technology, uses a noble metal member as a target, and adsorbs a crystal nucleus serving as a precursor on the etching target member, and the crystal nucleus of the etching target member.
- a new type of CVD technology uses a noble metal member as a target, and adsorbs a crystal nucleus serving as a precursor on the etching target member, and the crystal nucleus of the etching target member.
- a low dielectric constant member having a desired dielectric constant can be formed, and a porous material having a desired porosity can be manufactured.
- FIG. 1 is a schematic configuration diagram showing an etching apparatus according to a first embodiment of the present invention.
- FIG. 2 is a view taken along the arrow I I in FIG.
- FIG. 3 is a time chart showing one mode of an etching method using the apparatus shown in FIG. 1 in time series.
- FIG. 4 is a diagram schematically showing an adsorption process of the etching method of the present invention and a state of etching by the etching process.
- FIG. 5 is a diagram schematically showing an example of a method for selectively adsorbing crystal nuclei in the etching method of the present invention.
- FIG. 6 is a schematic configuration diagram showing an etching apparatus according to a second embodiment of the present invention.
- FIG. 7 is a schematic configuration diagram showing an etching apparatus according to a third embodiment of the present invention.
- FIG. 8 is a schematic configuration diagram showing a thin film manufacturing apparatus according to a fourth embodiment of the present invention.
- FIG. 9 is a schematic configuration diagram schematically showing a ULSI to which the etching method of the present invention can be applied.
- FIG. 1 is a schematic configuration diagram showing an etching apparatus according to the first embodiment of the present invention.
- a support base 2 is provided in the vicinity of the bottom of a cylindrical chamber 1 made of, for example, ceramic, and a substrate 3 that is a member to be etched is placed on the support base 2.
- the support 2 is provided with an etching temperature control means 6 having a heater 4 and a refrigerant flow means 5.
- the etching temperature control means 6 sets the temperature of the support 2 to a predetermined temperature (for example, the substrate 3 is heated from 100 ° C to 300 ° C). Temperature maintained at ° C).
- the shape of the chamber is not limited to a cylindrical shape, and for example, a rectangular chamber can be applied.
- the upper surface of the chamber 1 is an opening, and the opening is closed by a ceramic plate-like ceiling plate 7 which is an insulating material.
- the ceiling plate 7 may be a chamber 1 that is integrally provided with a ceiling plate that is not necessarily separate from the chamber 1.
- a plasma antenna 8 for converting the gas supplied into the chamber 1 into plasma, and this plasma antenna 8 is formed in a planar ring shape parallel to the surface of the ceiling plate 7.
- a matching unit 9 and a high frequency power source 10 are connected to the plasma antenna 8, and a high frequency electromagnetic wave is introduced into the chamber 1 through the plasma antenna 8. That is, the plasma antenna 8, the matching unit 9 and the high frequency power source 10 Configure the Kursa generation means.
- the noble metal member 11 is formed of a noble metal (in this example, iridium (Ir)) capable of forming a halide, and is disposed in the chamber 1 below the plasma antenna 8.
- This noble metal member 11 is for forming a noble metal component and a precursor that is capable of reacting with halogen by an etching action using halogen plasma.
- the halogen plasma is obtained by converting a working gas containing halogen (in this example, chlorine) supplied into the chamber 1 into plasma using high-frequency electromagnetic energy supplied by the plasma antenna 8.
- the noble metal member 11 is made up of a rod-like protrusion 12 and a ring part 13 as is apparent from FIG. 2 as viewed in the direction of arrow II in FIG. Each base end portion is fixed to the ring portion 13 so that the front end portion extends toward the center of the chamber 1 without contacting the front end portion of the adjacent projecting portion 12.
- each protrusion 12 has an electrically independent structure, and is devised so as not to shield the electromagnetic field formed by the plasma antenna 8 and introduced into the chamber 1.
- the noble metal member 11 is structurally discontinuous with respect to the circumferential direction, which is the flow direction of electricity of the plasma antenna 8.
- the noble metal member may be formed in a lattice shape or a mesh shape.
- the noble metal member 11 is provided with an etching temperature control means 106 including a heater 104 and a refrigerant circulation means 105 so that the temperature of the noble metal member 11 can be controlled to a predetermined temperature.
- the noble metal member 11 is heated by a gas plasma 23, which will be described later.
- the plasma generating means may be maintained at a predetermined temperature by controlling the gas plasma 23. It becomes.
- etching temperature control means 6 and 106 are controlled by the etching control means 110.
- a working gas containing chlorine as a halogen inside the chamber 1 around the cylindrical portion of the chamber 1 (a working gas diluted with He to a chlorine concentration of ⁇ 50%, preferably about 10%) 2 1
- a plurality of nozzles 14 serving as working gas supply means are connected at equal intervals in the circumferential direction (for example, eight locations: two locations are shown in the figure).
- the working gas 21 is sent to the nozzle 14 via a flow rate controller 15 that controls the flow rate and pressure of the working gas 21.
- the flow rate It is sufficient for the controller 15 to be provided for each nozzle 14 as long as one flow rate controller 15 is provided for the entire nozzle 14 shown in the figure. Good.
- FIG. 3 showing a time-series state in the chamber 1 of the etching apparatus.
- An electromagnetic field generated by high-frequency power enters the chamber 1 via the plasma antenna 8, and as shown in Fig. 3, first, He gas is introduced into the chamber 1 and preheated.
- the precious metal member 11 reaches a predetermined temperature due to preheating, working gas containing C1 gas 21
- gas plasma 23 in Fig. 1 means chlorine plasma.
- Chlorine radicals (C1 *) are formed by etching the noble metal member 11 to form a precursor 24 composed of noble metal, that is, iridium (Ir) and halogen, and at the same time, by etching temperature control means 6 and 106.
- the substrate 3 is held at a temperature lower than the temperature of the noble metal member 11 so that the precursor 24 is adsorbed on the substrate 3, and the precursor 24 (MC1) is adsorbed on the surface of the substrate 3 as a crystal nucleus. This is the adsorption step, and a desired amount of crystal nuclei is adsorbed on the substrate 3. The above is the adsorption process.
- the temperature of the substrate 3 is controlled to the high temperature side by the etching temperature control means 6 and 106 so that the precursor 24 is not adsorbed.
- chlorine radicals (C1 *) selectively act on the crystal nuclei adsorbed on the substrate 3, and only the crystal nuclei and the region where the crystal nuclei are adsorbed are anisotropically etched in the thickness direction of the substrate 3.
- anisotropic etching means that the etching rate in the thickness direction proceeds significantly more significantly than the etching rate in the direction intersecting with it, and in the thickness direction almost depending on the size of crystal nuclei. Only let the etching progress. Therefore, holes having the size of crystal nuclei are formed by the number of adsorbed crystal nuclei.
- anisotropic etching is performed in parallel in the adsorption process depending on the conditions where the adsorption process and the etching process are not clearly distinguished. There is a possibility to go forward.
- the amount of crystal nuclei is controlled by the adsorption process force by the timing of transfer to the etching process, and the amount of etching, that is, the depth of the hole is determined by the time of the etching process, the amount of chlorine radicals (C1 *) and It is controlled by the temperature of the substrate 3 and the like.
- the longer the etching process is, the greater the amount of chlorine radicals (C1 *), and the higher the temperature of the substrate 3, the deeper the depth of the formed hole.
- the speed of such anisotropic etching varies depending on the temperature of the substrate 3 and the film quality of the object to be etched, but is, for example, about 1 ⁇ mZmin.
- the etching temperature control means 6 and 106 in the adsorption process and the etching process described above are controlled by the etching control means 110. That is, in this embodiment, the etching control means 110 controls the etching temperature control means 6 and 106 to adsorb crystal nuclei made of the precursor 24 on the substrate 3, for example, the temperature of the substrate 3.
- the etching control means 110 controls the etching temperature control means 6 and 106 to adsorb crystal nuclei made of the precursor 24 on the substrate 3, for example, the temperature of the substrate 3.
- the etching control means 110 controls the etching temperature control means 6 and 106 to adsorb crystal nuclei made of the precursor 24 on the substrate 3, for example, the temperature of the substrate 3.
- C1 * chlorine radicals
- FIG. 4 schematically shows the state of etching by such an adsorption process and an etching process.
- (a) shows an adsorption process in the case of using the substrate 3 having an acid silicon film 132 formed on the surface of the silicon substrate 131.
- a state in which a plurality of crystal nuclei 133 of iridium chloride (IrCl 3) are adsorbed on 132 is shown.
- (A) also shows the state in which chlorine radicals (C1 *) act on the crystal nuclei 133 adsorbed on the silicon oxide film 132 in the etching process after the adsorption process.
- the etching control means 110 is the etching temperature control means 6.
- the adsorption process force is controlled to shift to the etching process.
- the adsorption process force is also controlled to the etching process.
- the flux of the precursor 24 composed of chlorine radical (C1 *), iridium) and halogen is controlled. This may be done by changing the ratio. In other words, in the adsorption process, the flux of the precursor 24 is controlled to be excessive, while in the etching process, the chlorine radical (C1 *) is controlled to be excessive.
- the flow rate of the working gas 21 is controlled by the flow rate controller 15 so that chlorine radicals (C1 *) are used only for etching the noble metal member 11 and free chlorine radicals.
- the flow rate controller 15 controls the flow rate of the working gas 21 to be larger than the appropriate flow rate in the adsorption process, so that chlorine radicals (C1 *) are generated. Try to be excessive.
- Such control of the flow rate controller 15 is executed by the etching control means 110.
- the temperature of the noble metal member 11 and the substrate 3 may be controlled simultaneously. For example, the temperature of the noble metal member 11 is lowered by the etching temperature control means 106 so that the noble metal member 11 is hardly etched.
- the precursor 24 may be difficult to adsorb by controlling the temperature of the substrate 3 to the high temperature side by the etching temperature control means 6.
- the size of the crystal nucleus adsorbed on the substrate 3 can be adjusted. That is, in order to increase the size of the crystal nucleus adsorbed on the substrate 3, the temperature of the noble metal member 11 should be changed to the high temperature side, and in order to reduce the size of the crystal nucleus, the noble metal member 11 Change the temperature to the low temperature side. That is, the higher the temperature of the noble metal member 11, the larger the clusters of the precursor 24 formed by etching of the chlorine radicals (C1 *). As a result, the crystal nuclei adsorbed on the substrate 3 increase.
- Such temperature control of the noble metal member 11 is performed by the etching temperature control means 6.
- the size of crystal nuclei adsorbed on the substrate 3 is controlled, and the etching time is changed as described above to adjust the depth of anisotropic etching, thereby adjusting the depth of the formed holes. Aspect ratio can be changed.
- micropores having a diameter of about lOnm can be formed, and anisotropic etching can be performed to a depth of about lOOnm with a microhole having a diameter of about lOnm.
- the aspect ratio (depth Z diameter) is about 10.
- crystal nuclei are adsorbed on the substrate 3 discontinuously and intermittently. As a result, a plurality of holes discontinuously and intermittently arranged are formed.
- the amount can be controlled by the adsorption time and the amount of precursor 24.
- the region where crystal nuclei are adsorbed to the substrate 3, that is, a predetermined etching region can be set as appropriate. For example, a mask is formed on the substrate 3 with a resist or the like, and only the etching region is opened. Can be set.
- the etching region can be set by changing the film quality on the surface of the substrate 3 in addition to a method of masking with a resist or the like. For example, since a metal film is easier to adsorb crystal nuclei than an oxide film, it is possible to set an etching area by using only the etching region as a metal film and the other regions as an acid film. It is.
- a treatment that makes it difficult for crystal nuclei to be adsorbed may be applied to regions other than the etching region, or a treatment that selectively adsorbs crystal nuclei only to the etching region.
- an excitation beam 141 that is a secondary electron is irradiated onto a predetermined region in which a hole is to be formed by anisotropic etching of the substrate 3.
- force X-rays, ultraviolet rays, or the like suitable for electron beams can be used.
- an electron beam for example, an electron beam having an acceleration voltage of 200 to 500 eV can be used.
- the excitation beam 141 is irradiated to a predetermined position, for example, if the temperature of the substrate 3 is set to a high temperature at which the crystal nuclei are not adsorbed, the precursor 24, iridium chloride, is excited.
- etching method of the present invention can be applied to a semiconductor process and used as a via hole penetrating the thin film. For example, if the etching process time is extremely shortened, the surface of the thin film is roughened. It can be used to make it face.
- the amount of crystal nuclei adsorbed is relatively increased so that the crystal nuclei are adsorbed on almost the entire surface, and then the etching process is performed to such an extent that no holes are formed.
- the surface of the thin film can be roughened, and the adhesion to the next formed film can be improved.
- the force used to form the chlorine plasma in the adsorption process and the etching process with a set of plasma generation means may be used to form these independently with separate plasma generation means. it can.
- FIG. 6 is a schematic diagram showing an etching apparatus according to a second embodiment of the present invention in which chlorine plasma in the adsorption process and chlorine plasma in the etching process are independently formed by separate plasma generating means. It is a block diagram.
- another coil-shaped plasma antenna 48 is disposed on the lower peripheral surface of the chamber 1.
- the plasma antenna 48 is connected to a high-frequency power source 50 through a matching unit 49, and forms another plasma generating means.
- a working gas supply for supplying a working gas 22 containing chlorine as a halogen (a working gas diluted with He to a chlorine concentration of ⁇ 50%, preferably about 10%) 22 in the lower part of the chamber 1
- a plurality of nozzles 16 as means are connected at equal intervals in the circumferential direction (for example, eight locations: two locations are shown in the figure).
- the nozzle 16 is supplied with the working gas 22 via a flow rate controller 17 that controls the flow rate and pressure of the working gas 22, and supplies the working gas 22 to the lower part of the chamber 1. It should be noted that it is sufficient for the flow rate controller 17 to be provided for each nozzle 16, as long as one flow rate controller 17 is provided for the entire nozzle 16 shown in the figure. May be provided.
- the adsorption step first, He gas is introduced into the chamber 1 and preheating is performed.
- the precious metal member 11 reaches a predetermined temperature due to preheating, the working gas 21 containing C1 gas is supplied to the chamber via the flow rate controller 15 and the nozzle 14. Supply within 1.
- chlorine contained in the working gas 21 is turned into plasma to form chlorine plasma 43 to generate chlorine radicals (C1 *), and the noble metal member 11 is etched by the chlorine radicals (C1 *).
- a precursor 24 composed of a noble metal, that is, iridium (Ir) and halogen is formed.
- the substrate 24 is held at a temperature lower than the temperature of the noble metal member 11 by at least one of the etching temperature control means 6 and 106 so that the precursor 24 is adsorbed on the substrate 3. Adsorbed on the surface of the substrate 3 as crystal nuclei.
- the steps up to here are the adsorption step, and a desired amount of crystal nuclei is adsorbed on the substrate 3.
- the supply to the chamber 1 is stopped and the C1 gas is supplied via the flow controller 17 and the nozzle 16.
- a working gas 22 is supplied to the lower part of the noble metal member 11 in the chamber 1.
- the C1 gas is generated by the plasma generating means comprising the plasma antenna 48, the matching unit 49 and the high frequency power source 50.
- the noble metal member 11 is not etched by the chlorine radical (C1 *), and the production of the precursor 24 is stopped. Then, the chlorine radical (C1 *) selectively acts on the crystal nucleus adsorbed on the surface of the substrate 3, and anisotropically etches the crystal nucleus and the region where the crystal nucleus is adsorbed. As a result, as in the first embodiment, the same number of crystal nuclei as the number of crystal nuclei adsorbed are formed. In the case of the present embodiment, it is not necessary to control the temperature of the substrate 3 to the high temperature side by the etching temperature control means 6 and 106 so that the precursor 24 is not adsorbed during the etching process. Such temperature control may be performed.
- the force is a case where chlorine radicals are formed in the chamber 1 in any of the adsorption process and the etching process, and is formed outside the chamber 1 in either process or both processes.
- a configuration in which the chlorine radicals are introduced into the chamber 1 can also be adopted.
- the etching apparatus according to the third embodiment exemplifies a so-called remote plasma type apparatus that forms chlorine radicals outside the chamber 1 in the etching process.
- FIG. 7 is a schematic configuration diagram showing an etching apparatus according to the third embodiment of the present invention.
- an opening 71 is formed at a plurality of locations (for example, four locations) around the lower portion of the chamber 1, and one end of a cylindrical passage 72 is fixed to the opening 71.
- An insulating excitation chamber 73 is provided in the middle of the passage 72, and a coil-shaped plasma antenna 74 is provided around the excitation chamber 73! /.
- the plasma antenna 74 is connected to a high frequency power source 76 through a matching unit 75.
- a flow rate controller 17 that controls the flow rate and pressure of the working gas 22 is controlled on the other end side of the passage 72, and the working gas 22 is supplied into the passage 72 via the flow rate controller 17.
- the supply into the chamber 1 is stopped, the chlorine gas 22 is supplied into the flow rate controller 17 passage 72, and electromagnetic waves are incident on the inside of the excitation chamber 73 from the plasma antenna 74.
- the generated chlorine radical (C1 *) is introduced into the chamber 1 through the opening 71.
- the noble metal member 11 is not etched by the chlorine radical (C1 *), and the precursor 24 is not generated.
- the chlorine radical (C1 *) selectively acts on the crystal nucleus adsorbed on the surface of the substrate 3 and anisotropically etches the crystal nucleus and the region where the crystal nucleus is adsorbed.
- the same number of crystal nuclei as the number of crystal nuclei adsorbed are formed.
- FIG. 8 is a schematic configuration diagram showing a thin film manufacturing apparatus according to the fourth embodiment of the present invention.
- this thin film production apparatus includes a chamber 1 made of, for example, ceramics for etching and a chamber 201 made of, for example, ceramics for producing a thin film, and a support base 2 is provided near the bottom of the chamber 1.
- the support base 2 is rotatably provided via a support portion 2a.
- the support 2 is driven to rotate by a rotation drive device (not shown), and the substrate 3 as a member to be etched and deposited on the support 2 is moved into the channels 1 and 201. It is possible.
- the support 2 is provided with a temperature control means 206 having a heater 4 and a refrigerant flow means 5.
- the etching temperature control means 206 the temperature of the support 2 is set to a predetermined temperature (for example, the substrate 3 is changed from 100 ° C). Temperature maintained at 300 ° C).
- the upper surfaces of the chambers 1 and 201 are openings, and the openings are closed by a flat ceiling plate 7 made of ceramics which is an insulating material.
- the ceiling plate 7 may be a chamber 1 that is integrally provided with a ceiling plate that is not necessarily separate from the chamber 1.
- Plasma antennas 8 and 208 for converting the gas supplied to the inside of the chamber 1 into plasma are respectively provided above the channels 1 and 201 of the ceiling plate 7.
- the plasma antennas 8 and 208 are respectively provided on the ceiling plate 7. It is formed in a plane ring shape parallel to the surface.
- Matching devices 9 and 209 and high-frequency power supplies 10 and 210 are connected to the plasma antennas 8 and 208, respectively, and high-frequency electromagnetic waves are introduced into the channels 1 and 201 through the plasma antennas 8 and 208, respectively. It is configured to be able to. That is, the plasma antenna 8, the matching unit 9, and the high frequency power source 10 are the plasma generation means of the chamber 1, and the plasma antenna 208, the matching unit 209 and the high frequency power source 210 are the plasma generation means of the chamber 201.
- the noble metal member 11 arranged in the chamber 1 is provided with a member 211 to be etched having the same configuration as the noble metal member 11 in the force chamber 201 as in the above-described embodiment.
- the member to be etched 211 is formed of, for example, a metal (for example, copper (Cu)) capable of forming a halide, and is disposed in the chamber 201 below the plasma antenna 208.
- This member to be etched 211 is made of metal by etching action with halogen plasma. This is for forming a precursor composed of a component (for example, copper) and a halogen.
- the halogen plasma 300 is obtained by converting the working gas 221 containing halogen (chlorine in this example) supplied into the chamber 201 into plasma using high-frequency electromagnetic energy supplied from the plasma antenna 208. .
- a working gas containing chlorine as a halogen inside chamber 201 as in chamber 1 (a working gas diluted with He to a chlorine concentration of ⁇ 50%, preferably about 10%)
- a plurality of nozzles 214 serving as working gas supply means for supplying 221 are connected at equal intervals in the circumferential direction.
- the working gas 221 is sent to the nozzle 214 via a flow rate controller 215 that controls the flow rate and pressure of the working gas 221.
- the film formation mode in the film formation process using the chamber 201 is the same as the conventional one. That is, chlorine radicals (C1 *) obtained by converting the working gas 221 (C1 gas) into plasma,
- the member 211 is etched to form a precursor 224 made of metal, that is, copper and halogen, and at the same time, the substrate 3 is held at a temperature lower than the temperature of the member 211 to be etched by the temperature control means 206, and the precursor 224 (MC1)
- the flux ratio of chlorine radicals (C1 *) falls within a predetermined range
- the formation of the copper thin film 219 having the copper power reduced from the precursor 224 by the chlorine radicals (C1 *) is started.
- the precursor 224 (MC1) is adsorbed on the surface of the substrate 3, and then the precursor 224 (MC1) is reduced with chlorine radicals (C1 *) to be precipitated as copper.
- Thin film 219 is expected.
- various metal films can be formed by changing the material of the member to be etched 211, for example, Al, Ta, Ti, W, Zn, In, Cd, or the like. Further, the present invention is not limited to these metal films, and a silicon film or an oxide silicon film can be formed.
- the film formation process and the etching process can be performed alternately and alternately without discharging the substrate 3 out of the chamber by rotating the support base 2. That is, the copper thin film 219 can be formed in the chamber 201, and the support 2 is rotationally driven to be positioned in the chamber 1, and the copper 24 is selectively adsorbed by the precursor 24 and selectively etched by chlorine radicals.
- a predetermined etching process (via hole formation or the like) can be performed on the thin film 219, and various semiconductor devices can be formed. For example, a via hole is formed in the thin film formed in the chamber 201 in the chamber 1, and this via hole is further formed in the chamber. It becomes possible to embed with 201. Further, after the surface of the copper thin film 219 formed in the chamber 201 is roughened in the chamber 1 to improve adhesion, another thin film can be formed in the chamber 201 thereon.
- the surface of the fine hole or thin film such as a through hole can be roughened.
- the substrate 3 is made of a metal plate or the like.
- a porous member can be produced and used for filter applications such as a gas filter and a catalyst filter.
- filter applications such as a gas filter and a catalyst filter.
- thin film filters with porous ceramic force have been used for such applications, and there is a problem that regeneration is difficult due to the adsorptivity of the ceramic itself.
- the porous member produced by the etching method of the present invention has a problem. Is a solution to this problem.
- the density can be reduced.
- a low dielectric constant dielectric film can be easily formed.
- Such a low dielectric constant dielectric film can be applied to, for example, an interlayer insulating film in a large scale integrated circuit (ULSI).
- ULSI 300 includes a transistor 310, a wiring layer 320, and an interlayer insulating film 324 therebetween.
- Such an interlayer insulating film 324 is made of, for example, an oxide silicon film, and a fine hole that does not penetrate in the thickness direction as shown in FIG. By forming this amount, the density can be reduced, and a low dielectric constant dielectric layer having a predetermined dielectric constant can be obtained.
- Such a low dielectric constant dielectric layer can be formed by performing only the formation of fine holes with the above-described etching apparatus, and using the above-described thin film manufacturing apparatus with various processes such as the formation power of transistors. Can also be used.
- the through hole for the formation of the W-plug 321 Formation and reduction of the dielectric constant of the dielectric film can be performed by the etching method of the present invention.
- the apparatus according to the first to fourth embodiments that can perform the etching method of the present invention can be applied to various applications.
- the noble metal member 11 is made of Ir.
- the present invention is not limited to this.
- a noble metal such as platinum (Pt) is used.
- the source gas is not limited to C1 gas, but is generally used for halogen gas.
- the etching method, the low dielectric constant dielectric film manufacturing method, the porous member manufacturing method, the etching apparatus and the thin film manufacturing apparatus of the present invention are used in the industry for manufacturing a thin film on the surface of a substrate.
- it is useful for a wide range of applications such as the manufacture of filters such as gas filters and catalytic filters.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US11/919,341 US20100062602A1 (en) | 2005-04-28 | 2006-04-28 | Etching method, method for producing dielectric film of low dielectric constant, method for producing porous member, etching system and thin film forming equipment |
JP2007514848A JP4550113B2 (ja) | 2005-04-28 | 2006-04-28 | エッチング方法、低誘電率誘電体膜の製造方法、多孔性部材の製造方法並びにエッチング装置及び薄膜作製装置 |
EP06745893A EP1881525A4 (en) | 2005-04-28 | 2006-04-28 | SCRAPPING METHOD, METHOD FOR PRODUCING DIELECTRIC DIELECTRIC FILM WITH LOW DIELECTRIC CONSTANT, METHOD FOR PRODUCING POROUS MEMBER, SCALE SYSTEM, AND FINE FILM FORMING EQUIPMENT |
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JP2005-133266 | 2005-04-28 | ||
JP2005133266 | 2005-04-28 |
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PCT/JP2006/309034 WO2006118271A1 (ja) | 2005-04-28 | 2006-04-28 | エッチング方法、低誘電率誘電体膜の製造方法、多孔性部材の製造方法並びにエッチング装置及び薄膜作製装置 |
Country Status (5)
Country | Link |
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US (1) | US20100062602A1 (ja) |
EP (1) | EP1881525A4 (ja) |
JP (1) | JP4550113B2 (ja) |
KR (1) | KR20080014799A (ja) |
WO (1) | WO2006118271A1 (ja) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
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US8187486B1 (en) * | 2007-12-13 | 2012-05-29 | Novellus Systems, Inc. | Modulating etch selectivity and etch rate of silicon nitride thin films |
EP2390925A1 (en) * | 2010-05-31 | 2011-11-30 | Applied Materials, Inc. | Thin film solar fabrication process, etching method, device for etching, and thin film solar device |
JP5870568B2 (ja) * | 2011-05-12 | 2016-03-01 | 東京エレクトロン株式会社 | 成膜装置、プラズマ処理装置、成膜方法及び記憶媒体 |
JP5712874B2 (ja) * | 2011-09-05 | 2015-05-07 | 東京エレクトロン株式会社 | 成膜装置、成膜方法及び記憶媒体 |
JP5803714B2 (ja) * | 2012-02-09 | 2015-11-04 | 東京エレクトロン株式会社 | 成膜装置 |
JP6051788B2 (ja) * | 2012-11-05 | 2016-12-27 | 東京エレクトロン株式会社 | プラズマ処理装置及びプラズマ発生装置 |
JP5939147B2 (ja) * | 2012-12-14 | 2016-06-22 | 東京エレクトロン株式会社 | 成膜装置、基板処理装置及び成膜方法 |
US9431268B2 (en) | 2015-01-05 | 2016-08-30 | Lam Research Corporation | Isotropic atomic layer etch for silicon and germanium oxides |
US9425041B2 (en) | 2015-01-06 | 2016-08-23 | Lam Research Corporation | Isotropic atomic layer etch for silicon oxides using no activation |
WO2019226341A1 (en) | 2018-05-25 | 2019-11-28 | Lam Research Corporation | Thermal atomic layer etch with rapid temperature cycling |
CN112424914A (zh) | 2018-07-09 | 2021-02-26 | 朗姆研究公司 | 电子激励原子层蚀刻 |
Citations (3)
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JP2003151962A (ja) * | 2001-11-14 | 2003-05-23 | Mitsubishi Heavy Ind Ltd | エッチング方法及びエッチング装置 |
JP2004083945A (ja) * | 2002-08-23 | 2004-03-18 | Mitsubishi Heavy Ind Ltd | 酸化金属膜及び窒化金属膜を作製する方法及び装置 |
JP2004200560A (ja) * | 2002-12-20 | 2004-07-15 | Mitsubishi Heavy Ind Ltd | 金属膜作製装置及び金属膜作製方法 |
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US6083413A (en) * | 1995-10-19 | 2000-07-04 | Massachusetts Institute Of Technology | Metals removal process |
SG79292A1 (en) * | 1998-12-11 | 2001-03-20 | Hitachi Ltd | Semiconductor integrated circuit and its manufacturing method |
JP3727878B2 (ja) * | 2001-11-14 | 2005-12-21 | 三菱重工業株式会社 | 金属膜作製装置 |
US20030145790A1 (en) * | 2002-02-05 | 2003-08-07 | Hitoshi Sakamoto | Metal film production apparatus and metal film production method |
EP1512772A1 (en) * | 2002-03-08 | 2005-03-09 | Mitsubishi Heavy Industries, Ltd. | Method and apparatus for production of metal film |
US6753250B1 (en) * | 2002-06-12 | 2004-06-22 | Novellus Systems, Inc. | Method of fabricating low dielectric constant dielectric films |
JP2004083845A (ja) * | 2002-06-25 | 2004-03-18 | Nippon Shokubai Co Ltd | 樹脂モルタル組成物及びその硬化物 |
-
2006
- 2006-04-28 EP EP06745893A patent/EP1881525A4/en not_active Withdrawn
- 2006-04-28 JP JP2007514848A patent/JP4550113B2/ja not_active Expired - Fee Related
- 2006-04-28 KR KR1020077027604A patent/KR20080014799A/ko not_active Application Discontinuation
- 2006-04-28 WO PCT/JP2006/309034 patent/WO2006118271A1/ja active Application Filing
- 2006-04-28 US US11/919,341 patent/US20100062602A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2003151962A (ja) * | 2001-11-14 | 2003-05-23 | Mitsubishi Heavy Ind Ltd | エッチング方法及びエッチング装置 |
JP2004083945A (ja) * | 2002-08-23 | 2004-03-18 | Mitsubishi Heavy Ind Ltd | 酸化金属膜及び窒化金属膜を作製する方法及び装置 |
JP2004200560A (ja) * | 2002-12-20 | 2004-07-15 | Mitsubishi Heavy Ind Ltd | 金属膜作製装置及び金属膜作製方法 |
Non-Patent Citations (1)
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See also references of EP1881525A4 * |
Also Published As
Publication number | Publication date |
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US20100062602A1 (en) | 2010-03-11 |
KR20080014799A (ko) | 2008-02-14 |
JPWO2006118271A1 (ja) | 2008-12-18 |
JP4550113B2 (ja) | 2010-09-22 |
EP1881525A1 (en) | 2008-01-23 |
EP1881525A4 (en) | 2011-05-11 |
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