WO2002047142A1 - Procede et appareil de traitement d'un article a traiter - Google Patents
Procede et appareil de traitement d'un article a traiter Download PDFInfo
- Publication number
- WO2002047142A1 WO2002047142A1 PCT/JP2001/010594 JP0110594W WO0247142A1 WO 2002047142 A1 WO2002047142 A1 WO 2002047142A1 JP 0110594 W JP0110594 W JP 0110594W WO 0247142 A1 WO0247142 A1 WO 0247142A1
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- WIPO (PCT)
- Prior art keywords
- processing
- gas
- reaction chamber
- wafer
- temperature
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 63
- 239000007789 gas Substances 0.000 claims abstract description 320
- 238000006243 chemical reaction Methods 0.000 claims abstract description 198
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 43
- 238000012545 processing Methods 0.000 claims description 336
- 239000000126 substance Substances 0.000 claims description 125
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 80
- 239000010408 film Substances 0.000 claims description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 34
- 239000010409 thin film Substances 0.000 claims description 30
- 239000005416 organic matter Substances 0.000 claims description 29
- 230000001590 oxidative effect Effects 0.000 claims description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 238000003672 processing method Methods 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- -1 triptyl phosphate Chemical compound 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- APSBXTVYXVQYAB-UHFFFAOYSA-M sodium docusate Chemical group [Na+].CCCCC(CC)COC(=O)CC(S([O-])(=O)=O)C(=O)OCC(CC)CCCC APSBXTVYXVQYAB-UHFFFAOYSA-M 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 20
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 239000011368 organic material Substances 0.000 abstract description 3
- 230000003213 activating effect Effects 0.000 abstract 1
- 235000012431 wafers Nutrition 0.000 description 181
- 238000004140 cleaning Methods 0.000 description 74
- 238000010926 purge Methods 0.000 description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- 229910052814 silicon oxide Inorganic materials 0.000 description 13
- 229910052760 oxygen Inorganic materials 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000000151 deposition Methods 0.000 description 7
- 230000008021 deposition Effects 0.000 description 7
- 239000000654 additive Substances 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 6
- 239000000356 contaminant Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000006837 decompression Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000003779 heat-resistant material Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System 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
-
- 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
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02046—Dry cleaning only
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/0223—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate
- H01L21/02233—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer
- H01L21/02236—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer group IV semiconductor
- H01L21/02238—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by oxidation, e.g. oxidation of the substrate of the semiconductor substrate or a semiconductor layer group IV semiconductor silicon in uncombined form, i.e. pure silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/02255—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by thermal treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02299—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer pre-treatment
- H01L21/02301—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer pre-treatment in-situ cleaning
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02299—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer pre-treatment
- H01L21/02312—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer pre-treatment treatment by exposure to a gas or vapour
-
- 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 at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
- H01L21/3165—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation
- H01L21/31654—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation of semiconductor materials, e.g. the body itself
- H01L21/31658—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation of semiconductor materials, e.g. the body itself by thermal oxidation, e.g. of SiGe
- H01L21/31662—Inorganic layers composed of oxides or glassy oxides or oxide based glass formed by oxidation of semiconductor materials, e.g. the body itself by thermal oxidation, e.g. of SiGe of silicon in uncombined form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—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
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67109—Apparatus for thermal treatment mainly by convection
Definitions
- the present invention relates to a method and an apparatus for processing an object to be processed such as a semiconductor wafer. More specifically, the present invention relates to a method and an apparatus for removing an organic substance attached to an object, and a method and an apparatus for further forming a thin film on the object from which the organic substance has been removed. Description of related technology
- a thin film such as a polysilicon film or a silicon oxide film on an object to be processed, for example, a wafer (hereinafter, referred to as a “wafer”) by a process such as a chemical vapor deposition (CVD). Is being done.
- CVD chemical vapor deposition
- the process of forming such a thin film is generally performed in a clean room to prevent contaminants from adhering to the wafer.
- a clean room it is difficult to completely remove contaminants.
- triptyl phosphate Tributyl Phosphate: TBP
- siloxane siloxane
- D0P dioctyl phyhalate
- contaminants organic substances
- the wafer is cleaned to remove organic substances attached to the wafer.
- the cleaning of the wafer is performed, for example, using a processing apparatus as shown in FIG.
- the wafer 53 is mounted on the mounting table 52 in the processing apparatus 51.
- the inside of the processing apparatus 51 that is, the wafer 53
- a processing gas for example, oxygen gas is supplied from the introduction port 55 into the processing apparatus 51.
- the supplied oxygen gas is thermally decomposed in the vicinity of the wafer 53 to generate oxygen atom radicals (0 *) and decompose organic substances attached to the surface of the wafer 53.
- the decomposed organic matter is discharged to the exhaust port 5 6 Is discharged out of the processing device 51 via the Thus, the wafer 53 is cleaned.
- the inside of the processing apparatus 51 (wafer 53) must be heated to a high temperature such as 600 ° C. in order to generate oxygen atom radicals. This is not preferable from the viewpoint of preventing thermal oxidation of the wafer.
- the wafers 53 are cleaned one by one, so that when cleaning a large number of wafers 53, the time required for cleaning becomes long.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a processing method and a processing apparatus for a target object, which can improve the efficiency of removing organic substances attached to the target object.
- a further object of the present invention is to provide a processing method and a processing apparatus capable of efficiently removing organic substances attached to a processing target at a relatively low temperature.
- a further object of the present invention is to provide a method and an apparatus for treating an object, which can remove organic substances attached to a plurality of objects in a short time.
- a further object of the present invention is to provide a processing method and a processing apparatus for further forming a thin film on an object from which organic substances have been removed.
- a method for treating an object to be treated according to a first aspect of the present invention includes: a step of accommodating an object to be treated with an organic substance in a reaction chamber; Heating the mixture to a temperature and supplying a processing gas to remove the organic matter from the object, wherein the processing gas includes an oxidizing gas and a reducing gas, and the temperature of the reaction chamber is reduced.
- the oxidizing gas and the reducing gas are heated to a temperature at which they can be activated.
- the organic substances attached to the object to be processed are oxidized and decomposed by the oxygen-active species and the hydroxyl-active species, and the organic substances are removed from the object.
- the Sani ⁇ gas for example, includes one gas even without least selected from the group consisting of 0 2, N 2 0, NO .
- the reducing gas for example, includes at least one gas selected from the group consisting of H 2, NE s CH 4.
- the temperature of the reaction chamber is heated to at least 350 ° C. As described above, even if the temperature of the reaction chamber is lowered, the organic substances attached to the object to be processed can be removed.
- the pressure in the reaction chamber it is preferable to set the pressure in the reaction chamber to 133 Pa to 3999 Pa.
- the pressure in the reaction chamber is set at a low pressure as described above, the processing gas can be uniformly supplied to the object to be processed.
- the reaction chamber may contain a plurality of objects to be processed to which the organic substance has adhered. In this case, it is possible to remove the organic substances attached to a plurality of objects to be processed by one treatment, and to shorten the time required for removing the organic substances.
- an apparatus for processing an object to be processed comprising: a heating unit capable of setting a predetermined temperature; a reaction chamber for accommodating the object to be processed; A process gas supply unit for supplying a process gas containing a reactive gas; an exhaust unit for exhausting a gas in the reaction chamber; and the heating unit enabling the oxidizing gas and the reducing gas to activate the reaction chamber.
- the processing gas containing the oxidizing gas and the reducing gas is supplied by the processing gas supply means to the reaction chamber containing the object to be processed to which the organic substance is attached.
- the heating section controlled by the control means heats the reaction chamber to a temperature at which the oxidizing gas and the reducing gas can be activated. Then, a combustion reaction occurs in the reaction chamber, and oxygen active species and hydroxyl active species are generated.
- the organic substances attached to the target object are oxidized and decomposed by the oxygen active species and the hydroxyl group active species, and the organic substances are removed from the target object.
- the oxidizing gas for example, include 0 2, N 2 0, one at least one gas selected from the group consisting of NO.
- the reducing gas includes, for example, at least one gas selected from the group consisting of H 2 and NH ss CH 4 .
- the control means preferably causes the heating unit to heat the temperature of the reaction chamber to at least 350 ° C. As described above, even if the temperature of the reaction chamber is lower than before, the organic substances attached to the object to be processed can be removed.
- control means causes the exhaust means to exhaust gas in the reaction chamber, and maintains the pressure in the reaction chamber at 133 Pa to 3999 Pa.
- the processing gas can be uniformly supplied to the object to be processed.
- the reaction chamber includes a processing object storage unit capable of storing a plurality of the processing objects, the control unit supplies the processing gas to the processing object storage unit, and the organic substance attached to the plurality of processing objects. Is preferably removed. In this case, it is possible to remove organic substances attached to a plurality of objects to be processed by a single treatment, and to shorten the time required for removing organic substances.
- a method for treating an object to be treated comprising the steps of: accommodating an object to which an organic substance is attached in a reaction chamber; heating the reaction chamber to a predetermined temperature and supplying a processing gas. Removing the organic matter from the object, wherein the processing gas contains ozone, and the temperature of the reaction chamber is heated to a temperature at which the ozone can be activated.
- the processing gas containing ozone is supplied to the reaction chamber containing the object to which the organic substance is attached. Then, the ozone is activated in the reaction chamber to generate oxygen atomic radicals.
- the organic substances attached to the object are decomposed by the oxygen atom radicals, and the organic substances are removed from the object. For this reason, the removal efficiency of the organic substances attached to the object can be improved.
- a plurality of substrates to which the organic substance has adhered may be accommodated in the reaction chamber. In this case, it is possible to remove organic substances adhered to a plurality of objects to be processed by a single treatment, and it is possible to shorten the time required for removing organic substances.
- the temperature of the reaction chamber is preferably heated to, for example, 300 ° C .; As described above, even if the temperature of the reaction chamber is lowered as compared with the conventional case, it is possible to remove the organic substances attached to the object to be processed.
- the pressure in the reaction chamber it is preferable to set the pressure in the reaction chamber to 13.3 Pa to 2660 Pa.
- the pressure in the reaction chamber is set to a low pressure as described above, the processing gas can be uniformly supplied to the object to be processed.
- organic substance examples include at least one of triptyl phosphate, siloxane, and dioctyl fluorate.
- a processing gas is supplied from a non-processing area on one side of a processing area for processing the object in the reaction chamber so as to reach the other side of the processing area, and a non-processing area on one side of the processing area is supplied. It is preferable that the processing gas that reaches the other side of the processing region be supplied to the processing region by exhausting gas in the reaction chamber from the processing region. In this case, the processing gas that has reached the other side of the processing region is uniformly supplied to the processing region by exhausting the gas in the reaction chamber. Then, the organic matter is removed from the object to be processed by the processing gas and exhausted to the outside of the reaction chamber.
- the above method may further include a thin film forming step of forming a thin film on the object by supplying a film forming gas to the object from which organic substances have been removed.
- a thin film forming step of forming a thin film on the object by supplying a film forming gas to the object from which organic substances have been removed.
- the step of accommodating the object to be processed, the step of removing the organic substance, and the step of forming the thin film are performed by one and the same apparatus. In this case, formation of a thin film on the object to be processed is simplified. Further, during the transition from the processing step to the thin film forming step, there is no possibility that an organic substance adheres to the object to be processed.
- a loading temperature at which the object to be processed is accommodated in the reaction chamber in the step of accommodating the object to be treated is substantially equal to a temperature of the reaction chamber in the step of removing the organic substance. In this case, the temperature operation for removing the organic matter is not required.
- An object processing apparatus includes: a reaction chamber that has a heating unit that can be set to a predetermined temperature, accommodates an object to which an organic substance is attached, and the reaction chamber Processing gas supply means for supplying a processing gas containing ozone to the exhaust gas; exhaust means for exhausting gas in the reaction chamber; and control means for heating the reaction chamber to a temperature at which the ozone can be activated by the heating unit. Comprising.
- the processing gas containing ozone is supplied to the reaction chamber containing the object to be treated with the organic substance by the processing gas supply means. Then, the heating section controlled by the control means heats the reaction chamber to a temperature at which ozone can be activated, and the ozone supplied to the reaction chamber is activated to generate oxygen atom radicals. The organic matter attached to the object to be processed is decomposed by the oxygen atomic radical, and the organic substance is removed from the object to be processed.
- the reaction chamber includes a processing object storage unit capable of storing a plurality of the processing objects, the control unit supplies the processing gas to the processing object storage unit, and the organic substance attached to the plurality of processing objects. Is preferably removed. In this case, it is possible to remove organic substances attached to a plurality of objects to be processed by a single treatment, and to shorten the time required for removing organic substances.
- the reaction chamber preferably has a conductance capable of maintaining the active state of the ozone.
- a reaction chamber for example, there is a reaction chamber having a single tube structure.
- the control means preferably causes the heating section to heat the temperature of the reaction chamber to, for example, 300 ° C .; Thus, even if the temperature of the reaction chamber is lowered, the efficiency of removing organic substances attached to the object can be improved.
- control unit causes the exhaust unit to exhaust gas in the reaction chamber, and maintains the pressure in the reaction chamber at, for example, 13.3 Pa to 260 OPa.
- the pressure in the reaction chamber is set to a low pressure as described above, the processing gas can be uniformly supplied to the object to be processed.
- the processing gas supply means has an ozone generation unit composed of a plasma generator, and an ozone generation gas supply pipe for supplying oxygen gas, nitrogen gas or carbon dioxide is connected to the ozone generation unit. It is preferred that When an ozone generating gas supply pipe for supplying oxygen gas and nitrogen gas is connected, the generation efficiency of ozone generated in the ozone generation unit is improved. In addition, if an ozone generating gas supply pipe that supplies oxygen gas and carbon dioxide is connected, the processing generated in the ozone generation unit NO x is not contained in the gas, and the processing gas supply means for supplying the processing gas into the reaction chamber is less likely to corrode.
- the reaction chamber has a processing region for processing an object to be processed, and has a non-processing region on at least one side of the processing region, and the processing gas supply unit and the exhaust unit have a non-processing region on one side of the processing region.
- the control means is disposed in a processing area, and the control means causes the processing gas supply means to supply the processing gas from the non-processing area to reach the other side of the processing area, and the exhaust means exhausts the gas in the reaction chamber. By doing so, it is preferable to supply the ozone that has reached the other side of the processing area to the processing area. In this case, the processing gas that has reached the other side of the processing region by the processing gas supply unit is uniformly supplied to the processing region by the exhaust unit. Then, the organic gas is removed from the object by the processing gas and exhausted to the outside of the reaction chamber.
- the processing gas supply means includes a processing gas supply pipe for supplying a processing gas into the reaction chamber.
- the tip of the processing gas supply pipe is bent in the direction of the non-processing area on the other side so as to be supplied from the non-processing area on the one side to the non-processing area on the other side through the non-processing area.
- the conductance in the reaction chamber is improved.
- the processing apparatus further includes: a film forming gas supply unit that supplies a film forming gas into the reaction chamber; and a heating unit that heats the reaction chamber to a predetermined temperature and removes an organic substance by the film forming gas supply unit. And a film forming control means for supplying the film forming gas to the processed object to form a thin film on the processed object.
- FIG. 1 is a schematic diagram showing a first embodiment of a processing apparatus according to the present invention.
- FIG. 2 is a diagram showing a recipe for explaining a cleaning procedure executed by the processing apparatus shown in FIG.
- FIG. 3 is a graph showing the amount of attached organic matter (contact angle) under each of the cleaning conditions shown in Table 1.
- FIG. 4 is a schematic view showing a second embodiment of the processing apparatus according to the present invention.
- FIG. 3 is a diagram showing a recipe for the present invention.
- FIG. 5 is a schematic view showing a third embodiment of the processing apparatus according to the present invention.
- FIG. 8 is a diagram showing a receiver for explaining a cleaning procedure and a thin film forming procedure performed by the processing apparatus shown in FIG.
- FIG. 9 is a schematic diagram of a conventional processing apparatus. Description of the preferred embodiment
- a first embodiment of the present invention is decomposed and removed (cleaned) by using a batch-type vertical heat treatment apparatus shown in FIG. 1 to decompose and remove a semiconductor wafer (hereinafter, referred to as a “wafer”), that is, an organic substance adhered on an object to be processed.
- a wafer a semiconductor wafer
- the heat treatment apparatus 1 includes a substantially cylindrical reaction tube 2 whose longitudinal direction is directed vertically.
- the reaction tube 2 is composed of an inner tube 3 that forms a film forming area inside, and an outer tube 4 with a ceiling that covers the inner tube 3 and is formed so as to have a certain distance from the inner tube 3. It has a heavy pipe structure.
- the inner tube 3 and the outer tube 4 are formed of a heat-resistant material, for example, quartz.
- a manifold 5 made of stainless steel (SUS) formed in a cylindrical shape is arranged below the outer tube 4.
- the manifold 5 is air-tightly connected to the lower end of the outer tube 4.
- the inner tube 3 protrudes from the inner wall of the manifold 5 and is supported by a support ring 6 formed integrally with the manifold 5.
- a lid 7 is arranged below the manifold 5, and the lid 7 can be moved up and down by a boat elevator 8. When the lid 7 rises, the lower side of the manifold 5 is closed.
- a wafer boat 9 made of quartz is placed on the lid 7.
- the wafer boat 9 accommodates a plurality of wafers 10 at predetermined intervals in the vertical direction.
- a heat insulator 11 is provided around the reaction tube 2 so as to surround the reaction tube 2.
- a heating heater 12 composed of a resistance heating element is provided on the inner wall surface. The inside of the reaction tube 2 is set to a predetermined temperature by operating the heater 12 for raising the temperature.
- a plurality of gas introduction pipes pass through the side of the manifold 5.
- two gas introduction pipes that is, a first gas introduction pipe 13 and a second gas introduction pipe 14 are connected to the side surface of the manifold 5.
- the first gas introduction pipe 13 is disposed so as to face the inside of the inner pipe 3. As shown in FIG. 1, the first gas introduction pipe 13 is passed through the side of the manifold 5 below the support ring 6 (below the inner pipe 3). Then, an oxidizing gas such as an oxygen gas (O 2 ) is introduced into the inner tube 3 from the first gas introduction tube 13.
- an oxidizing gas such as an oxygen gas (O 2 ) is introduced into the inner tube 3 from the first gas introduction tube 13.
- the second gas inlet pipe 14 is disposed so as to face the inside of the inner pipe 3, and, like the first gas inlet pipe 13, the side of the manifold 5 below the support ring 6 (below the inner pipe 3). It is inserted through. Then, for example, a reducing gas such as hydrogen gas (H) is introduced into the inner pipe 3 from the second gas introduction pipe 14.
- a reducing gas such as hydrogen gas (H) is introduced into the inner pipe 3 from the second gas introduction pipe 14.
- a discharge port 15 is provided on the side of the manifold 5.
- the discharge port 15 is provided above the support ring 6 and communicates with a space formed between the inner tube 3 and the outer tube 4 in the reaction tube 2. Then, oxygen gas is supplied from the first gas introduction pipe 13 and hydrogen gas is supplied from the second gas introduction pipe 14 into the inner pipe 3 to be cleaned, and organic matter decomposed by the cleaning is removed from the inner pipe 3 to the outer pipe 3. It is discharged to outlet 15 through pipe 4.
- a purge gas supply pipe 16 for supplying nitrogen gas as a purge gas is provided below the outlet 15 on the side surface of the manifold 5.
- An exhaust pipe 17 is hermetically connected to the outlet 15.
- the exhaust pipe 17 has a valve 18 and a vacuum pump 19 interposed therebetween.
- the valve 18 adjusts the opening of the exhaust pipe 17 to control the pressure in the reaction pipe 2 to a predetermined pressure.
- the vacuum pump 19 exhausts the gas inside the reaction tube 2 via the exhaust tube 1 ⁇ ⁇ ⁇ ⁇ and adjusts the pressure inside the reaction tube 2.
- Control part 20 for boat elevator 8, heating heater 12, 1st gas introduction pipe 13, 2nd gas introduction pipe 14, purge gas supply pipe 16, valve 18 and vacuum pump 19 Is connected.
- Control unit 20 is a microprocessor, process controller —Controls each part of the heat treatment apparatus 1 by measuring the temperature, pressure, etc. of each part of the heat treatment apparatus 1 and outputting a control signal or the like to the above parts based on the measurement data. Referring to the recipe (time sequence) shown in FIG. 2, a processing method for cleaning the organic substances adhered on the wafer 10 with the processing gas containing oxygen gas and hydrogen gas using the heat treatment apparatus 1 is described. explain. In the following description, the operation of each unit constituting the heat treatment apparatus 1 is controlled by the control unit 20.
- a wafer boat 9 containing a wafer 10 to which organic substances are attached is placed on the lid 7. Further, the inside of the reaction tube 2 is set to a predetermined opening temperature by the heater 12 for temperature rise.
- the lid 7 is raised by the boat elevator 8, and the wafer boat 9 on which the wafer 10 is mounted is loaded into the inner tube 3 of the reaction tube 2.
- the wafer 10 is accommodated in the reaction tube 2 and the reaction tube 2 is sealed.
- a predetermined amount of nitrogen gas is supplied from the purge gas supply pipe 16 into the reaction tube 2 to discharge contaminants such as organic substances mixed into the reaction tube 2 (loading process).
- the pressure in the reaction tube 2 is started. Specifically, a predetermined amount of nitrogen gas is supplied from the purge gas supply pipe 16 into the reaction pipe 2, and the vacuum pump 19 is driven while controlling the degree of the valve 18, and the reaction pipe 2 is driven. Exhaust gas inside. The gas in the reaction tube 2 is discharged until the pressure in the reaction tube 2 becomes from a normal pressure to a predetermined pressure, for example, 13 P a to 39 P a (1 Tor * r to 3 T orr). Do.
- the inside of the reaction tube 2 is heated to 350 ° C. or more, which is a temperature at which the oxidizing gas (oxygen gas) and the reducing gas (hydrogen gas) can be activated, by the heater 12 for heating. If the temperature of the reaction tube 2 is lower than 350 ° C., the oxygen gas and the hydrogen gas are not activated. However, if the temperature of the reaction tube 2 is too high, the surface of the wafer 10 is oxidized. Therefore, the temperature of the reaction tube 2 is preferably set to 350 ° C .; Preferably, it is heated to 350 ° C to 400 ° C. Then, the decompression and heating operations are performed until the inside of the reaction tube 2 is stabilized at a predetermined pressure and temperature (stabilization step).
- a predetermined pressure and temperature stabilization step
- the supply of the nitrogen gas from the purge gas supply tube 16 is stopped. Then, a predetermined flow of oxygen gas from the first gas introduction pipe 13 is performed. At the same time, hydrogen gas is supplied at a predetermined flow rate, for example, 0.9 liter / min, into the inner pipe 3 of the reaction tube 2 from the second gas introduction pipe 14.
- the supply of the processing gas (oxygen gas, hydrogen gas) from the first gas introduction pipe 13 and the second gas introduction pipe 14 is stopped.
- the vacuum pump 19 is driven to discharge the gas in the reaction tube 2 while controlling the degree of the nozzle 18, and then a predetermined amount of nitrogen gas is supplied from the purge gas supply tube 16 to the reaction tube 2.
- the gas in 2 is discharged to the exhaust pipe 17 (purge step). In order to reliably discharge the gas in the reaction tube 2, it is preferable to repeat the discharge of the gas in the reaction tube 2 and the supply of the nitrogen gas a plurality of times.
- a predetermined amount of nitrogen gas is supplied from the purge gas supply pipe 16 to return the inside of the reaction tube 2 to normal pressure (760 Torr), and the wafer boat 9 holding the wafer 10 is unplugged from the reaction tube 2. (About an mouthful).
- the sample of the wafer 10 to which the organic substance was adhered was cleaned under various conditions. Form 1000 ⁇ thick oxide film on wafer 10 Then, the surface of the silicon oxide film was washed with diluted hydrofluoric acid (DHF) for 1 minute, and then left in a clean room for a predetermined time to prepare a sample of the wafer 10 to which organic substances had adhered.
- DHF diluted hydrofluoric acid
- the adhesion amount of the organic substance was measured using a contact angle method.
- the contact angle method is a method in which pure water is dropped on a wafer 10 and the contact angle of the pure water droplet is measured. The more organic substances are attached to the wafer 10, the higher the hydrophobicity and the larger the contact angle. Conversely, as the amount of organic matter attached decreases, the hydrophilicity increases and the contact angle decreases.
- the contact angles were measured at five points on the wafer 10, and the average value was obtained.
- the contact of the prepared sample was 57 °. Even if pure water is dropped onto the wafer 10 from which organic substances have been completely removed, the contact angle of the pure water droplet does not become 0 °, and it is difficult to perform a precise measurement at a low angle. Therefore, it is considered that organic substances are almost completely removed from the wafer 10 having a contact angle of 2 ° or less.
- Table 1 shows the cleaning conditions. As shown in Table 1, the temperature of the reaction tube 2 (Example 1, Example 2, Comparative Example 1, Comparative Example 2), the pressure of the reaction tube 2 (Examples 3 to 5), the cleaning time (Example The cleaning was performed by changing the examples 6, 7) and the like, and the effects of temperature, pressure and time on the cleaning effect were examined. Note that here, the experiment In order to simplify the test, except for Example 8, the wafer boat 9 was tested by storing only one wafer 10 (total of 3 wafers) in each of the upper, middle and lower three places. The average value of the contact angles of the accommodated wafers 10 was used as the contact angle of each example. The cleaning effect when the number of wafers 10 was large was confirmed in Example 8. The results are shown in Table 1 and FIG. FIG. 3 shows a bar graph of the contact angle of the droplet after cleaning for each example. For reference, the contact angles without cleaning are also shown in Table 1 and FIG.
- Example 1 and Example 2 in Table 1 and FIG. 3 when the temperature of the reaction tube 2 was 350 ° C. and 400 ° C., organic substances attached to the wafer 10 were almost completely removed. Was confirmed. Further, as shown in Table 1 and Comparative Example 1 and Comparative Example 2 in FIG. 4, when the temperature of the reaction tube 2 is 300 ° C. and 330 ° C., the organic substances attached to the wafer 10 are not removed. This is because if the temperature of the reaction tube 2 is lower than 350 ° C., the oxygen gas and the hydrogen gas are not activated, so that 0 * and OH * are not generated, so that organic substances cannot be decomposed.
- the organic matter attached to the wafer 10 can be removed even if the temperature of the reaction tube 2 is higher than 350 ° C., but if the temperature of the reaction tube 2 is too high, the wafer 10 The surface is oxidized.
- the temperature of the reaction tube 2 is preferably set at 350 ° C. to 600 ° C., more preferably at 350 ° C. to 400 ° C.
- Example 1 and Examples 3 to 5 in Table 1 and FIG. 3 when the pressure of the reaction tube 2 was 13 Pa to 39 Pa, almost no organic matter adhered to the wafer 10. It was confirmed that it was completely removed.
- the pressure in the reaction tube 2 exceeds 3999 Pa, 0 * and OH * may not be supplied uniformly to all the wafers 10 accommodated in the wafer boat 9. It is preferable that the pressure in the reaction tube 2 is set to 133 Pa to 3999 Pa.
- Example 1 minute to 30 minutes As shown in Example 1, Example 6, and Example 7 in Table 1 and FIG. 3, when the cleaning time is 1 minute to 30 minutes, organic substances adhering to the wafer 10 are almost completely removed. Was confirmed. If the cleaning time is shorter than 1 minute, organic substances adhering to the wafer 10 may not be almost completely removed.If the cleaning time is longer than 30 minutes, the cleaning of the wafer 10 can be efficiently performed. You can no longer do it. Therefore, the cleaning time is preferably set to 1 minute to 30 minutes. However, this time can be further lengthened or shortened depending on the amount of the organic substance adhering to the wafer 10.
- Example 1 and Example 8 in Table 1 and FIG. 3 even when the number of wafers 10 in the wafer boat 9 was changed from three to 100, the effect of removing organic substances adhering to the wafer 10 was reduced. It was confirmed that the result was not affected. This is because the inside of the reaction tube 2 is maintained at a low pressure. For this reason, even if the number of wafers 10 in the wafer boat 9 increases to, for example, 100, the pressure and the cleaning time of the reaction tube 2 show the same tendency. In general, the surface condition of the plane (wafer 10) on which pure water is dropped is easily affected. If the surface shape of the wafer 10 is changed by cleaning, it is impossible to accurately measure the amount of organic substances attached. It is considered to be lost. For this reason, the surface shape of the wafer 10 before and after cleaning was confirmed. As a result, it was confirmed that the surface shape of the wafer 10 hardly changed before and after cleaning.
- oxygen gas from the first gas introduction pipe 13 and hydrogen gas from the second gas introduction pipe 14 are supplied into the reaction tube 2 heated to 350 ° C. or more.
- organic substances attached to the wafer 10 can be removed. Therefore, the organic substances attached to the wafer 10 can be removed by the simple heat treatment apparatus 1. Further, organic substances attached to the wafer 10 can be removed at a lower temperature than in the conventional cleaning method.
- an ozone generator such as an ultraviolet irradiation device or a plasma generator, which is necessary for performing cleaning using ozone gas, which will be described later, is not required, so that the structure of the heat treatment apparatus 1 can be simplified. can do.
- the present embodiment it is possible to remove the organic substances attached to the plurality of wafers 10 housed in the wafer boat 9 by a single cleaning. Therefore, even when cleaning a large number of wafers 10, the time required for cleaning can be shortened.
- oxygen gas was used as the oxidizing gas
- hydrogen gas was used as the reducing gas.
- the group consisting of O 2 , N 20 and NO as oxidizing gases At least one gas selected from the group consisting of H 2 , NH 3 and CH 4 may be used as the reducing gas.
- the organic substances adhering to the wafer 10 can be removed by the oxygen-active species and the hydroxyl-active species generated in the process of burning the reducing gas as described above.
- the above gases other than oxygen gas and hydrogen gas are used as the oxidizing gas and the reducing gas
- the temperature of the reaction tube 2 and the temperature in the reaction tube 2 are the same as when oxygen gas and hydrogen gas are used.
- cleaning conditions such as pressure
- the organic substance attached to the wafer 10 was removed by using the heat treatment apparatus 1 having the reaction tube 2 having a double tube structure composed of the inner tube 3 and the outer tube 4, but the heat treatment device shown in FIG. It is also possible to use a heat treatment apparatus having a single pipe structure in which the inner pipe 3 and the support ring 6 are removed from 1. In this case, the structure of the heat treatment equipment can be simplified.
- the organic matter attached to the wafer 10 is removed using the notch type vertical heat treatment apparatus 1, but a single-wafer heat treatment apparatus may be used. Also in this case, the organic substances attached to the wafer 10 can be removed with a simple device. Further, organic substances attached to the wafer 10 can be removed at a low temperature.
- the number of the first gas introduction pipes 13 and the number of the second gas introduction pipes 14 are not limited to one, and may be plural.
- the object to be processed is not limited to the wafer 10, and may be, for example, a glass substrate.
- the second embodiment of the present invention is performed by using a batch type vertical heat treatment apparatus shown in FIG. 4 to decompose and remove (cleaning) organic substances adhering to a wafer (object to be processed) with a processing gas containing ozone.
- a batch type vertical heat treatment apparatus shown in FIG. 4 to decompose and remove (cleaning) organic substances adhering to a wafer (object to be processed) with a processing gas containing ozone.
- the heat treatment apparatus 101 includes a single-tube reaction tube 102 formed in a cylindrical shape with a ceiling having a longitudinal direction oriented in a vertical direction.
- the reaction tube 102 is formed of a heat-resistant material, for example, quartz.
- the lower part of the reaction tube 102 is made of stainless steel (SUS) formed in a cylindrical shape Manifold 103 is arranged.
- the manifold 103 is airtightly connected to the lower end of the reaction tube 102.
- a lid 104 is arranged below the manifold 103, and the lid 104 can be moved up and down by a boat elevator (not shown).
- the lid 104, the reaction tube 102, and the manifold 103 constitute a processing chamber 103 a. Then, when the lid 104 rises and comes into contact with the manifold 103, the lower side of the manifold 103 is closed, and the processing chamber 103a is sealed.
- a wafer boat 105 made of quartz is placed on the lid 104.
- the wafer boat 105 houses a plurality of objects to be processed, for example, wafers 106 at predetermined intervals in the vertical direction.
- the wafer 106 accommodated in the wafer boat 105 is placed inside the processing chamber 1a by inserting the wafer boat 105 into the reaction tube 102, and the wafer 106 Are arranged in the processing chamber 103a in the processing chamber 103a. Further, the periphery of the processing region 103b constitutes a non-processing region.
- the inner wall surface of the reaction tube 102 and the end of the wafer 106 mounted on the wafer boat 105 are formed. It is formed in such a size as to have a gap D between the part and.
- This gap D is determined in consideration of the flow rate of ozone, the pressure inside the reaction tube 102, the height of the reaction tube 102, etc., so that a predetermined exhaust conductance can be obtained in the processing chamber 103a. For example, 2 O mn!
- the size is set to about 50 mm.
- a heating heater 107 made of a resistance heating element is provided around the reaction tube 102 so as to surround the reaction tube 102, and the heating heater 107 is operated. Thereby, the inside of the reaction tube 102 is set to a predetermined temperature.
- a processing gas supply pipe 108 is disposed in the non-processing area 103 c on one side of the processing area 103 b in the processing chamber 103 a (in this embodiment, below the processing area 103 b). It has been.
- the processing gas supply pipe 108 is passed through the side surface of the manifold 103.
- a Teflon pipe is used to prevent corrosion of the pipe.
- the processing gas supply pipe 108 has a tip portion 108 a that faces the accommodation position of the wafer 106, that is, the direction (upward) of the processing region 103 b. It has a processing gas introduction portion 108 b directed toward the processing region 103 b at the tip end portion 108 a.
- the processing gas containing ozone supplied from the processing gas introduction section 108 b of the processing gas supply pipe 108 is ejected toward the upper side of the reaction tube 102.
- the distal end 108 a is located outside the processing region 103 b (for example, a space corresponding to the gap D shown in FIG. 4) where the processing gas ejected upward from the processing gas supply pipe 108 is located.
- And is disposed at a position where it is supplied to the other side of the processing region 103b, that is, the upper part of the reaction tube 102.
- the processing gas supply pipe 108 is connected to the ozone generator 109.
- the ozone generator 109 is composed of, for example, a plasma generator or the like, and generates ozone based on oxygen.
- the oxygen gas supply pipe 111 and the additive gas supply pipe 112 are connected to the ozone generator 109 via a purifier 110. Then, the oxygen gas from the oxygen gas supply pipe 111 and the additive gas composed of the nitrogen gas or carbon dioxide gas from the additional gas supply pipe 112 are supplied to the purifier 110, and are supplied by the purifier 110. Then, it is supplied to the ozone generator 109 at a purity suitable for ozone generation (suppressing generation of corrosive gas due to impurities, especially water).
- An exhaust port 113 is provided on a side surface of the manifold 103 in the non-processing region 103c.
- the exhaust port 113 is provided at a position facing the processing gas supply pipe 108 in the non-processing area 103c, and exhausts the gas in the reaction pipe 102.
- An exhaust pipe 1 14 is hermetically connected to the exhaust port 113.
- a combination valve 115 and a vacuum pump 116 are provided in this order from the upstream side.
- the combination valve 115 adjusts the opening of the exhaust pipe 114 to control the pressure in the reaction pipe 102 and the pressure in the exhaust pipe 114 to a predetermined pressure.
- the vacuum pump 116 exhausts the gas in the reaction tube 102 via the exhaust tube 114, and adjusts the pressure in the reaction tube 102 and the exhaust tube 114.
- a purge gas for example, a nitrogen gas
- the control unit 120 is connected.
- the control unit 120 It is composed of a microprocessor, a process controller, etc., measures the temperature, pressure, etc. of each part of the heat treatment apparatus 101 and outputs control signals, etc., to each of the above parts based on the measured data, and the various parts of the heat treatment apparatus 101 Control.
- a processing method for cleaning organic substances adhering to the wafer 106 with a processing gas containing ozone using the heat treatment apparatus 101 will be described with reference to a recipe (time sequence) shown in FIG.
- the operation of each unit constituting the heat treatment apparatus 101 is controlled by the control unit 120.
- a wafer boat 105 containing a wafer 106 to which organic substances are attached is placed on the lid 104.
- the inside of the reaction tube 102 (processing chamber 103 a) is heated to a predetermined temperature (mouth temperature), for example, 300 ° C. by the heating heater 107.
- the lid 104 is raised by a boat elevator (not shown), and the wafer boat 105 (wafer 106) is loaded into the processing chamber 103a.
- the wafer 106 is accommodated in the processing chamber 103a, and the processing chamber 103a is sealed.
- nitrogen gas (N 2 ) is supplied from the purge gas supply pipe 117 into the processing chamber 103 a at a predetermined flow rate, for example, about 20 liters / min. Emit pollutants such as materials.
- the nitrogen gas is supplied for a predetermined time, for example, about 5.5 minutes (loading step).
- the pressure in the processing chamber 103a is started. Specifically, nitrogen gas is supplied from the purge gas supply pipe 1 17 into the processing chamber 103 a at a predetermined flow rate, for example, 20 liters / min, and while controlling the combination rate of the combination valve 115, The vacuum pump 1 16 is driven to discharge the gas in the processing chamber 103 a.
- the gas in the processing chamber 103 a is discharged when the pressure in the processing chamber 103 a is changed from normal pressure to a predetermined pressure, for example, 13.3 Pa to 2660 Pa (1 Torr to 2 0 0 T orr) c the performed until the processing chamber 1 by raising the temperature for heating the evening 1 0 7 0 3 a within a predetermined temperature (cleaning temperature), for example, 3 0 0 ° C ⁇ 6 0 0 ° C Heat to Then, the decompression and heating operations are performed for a predetermined time, for example, about 17 minutes so that the inside of the processing chamber 103a is stabilized at a predetermined pressure and temperature (stabilization step).
- a predetermined pressure for example, 13.3 Pa to 2660 Pa (1 Torr to 2 0 0 T orr) c the performed until the processing chamber 1 by raising the temperature for heating the evening 1 0 7 0 3 a within a predetermined temperature (cleaning temperature), for example, 3 0 0 ° C ⁇ 6 0 0
- the purge gas supply pipe 1 1 When the inside of the processing chamber 103 a is stabilized at a predetermined pressure and temperature, the purge gas supply pipe 1 1 The supply of nitrogen gas from 7 is stopped. Then, a predetermined flow rate of oxygen gas from the oxygen gas supply pipe 111, for example, 1 liter / mir! Further, nitrogen gas is supplied to the purifier 110 at a predetermined flow rate, for example, from 0.008 liter / min to 0.08 liter Zmin from the additional gas supply pipe 112 at up to 10 liters / min. The supplied oxygen gas and nitrogen gas are brought into a state suitable for ozone generation in the purifier 110 and supplied to the ozone generator 109.
- the supplied oxygen is irradiated with plasma by a plasma generator (not shown) to generate ozone.
- a processing gas containing ozone at a predetermined concentration for example, 50 g / Nm 3 to 300 g / Nm 3 (2.35 vol 1% to 14.1 vo 1%) is supplied from the ozone generator 109 to the processing gas supply pipe.
- a predetermined flow rate for example, about 1 liter / min to 10 liters / min, into the processing chamber 103a so as to reach the ceiling of the reaction tube 102 (the upper part of the wafer boat 105) through the 108 (processing gas inlet 8b).
- the supply of the processing gas into the processing chamber 103a is performed, for example, for 5 to 30 minutes (cleaning step).
- the ozone generator 109 connected to the processing gas supply pipe 108 is supplied with nitrogen gas in addition to oxygen gas, the generation efficiency of ozone generated by the ozone generator 109 is improved. I do.
- the processing gas contains NO X, but since the processing gas supply pipe 108 uses a Teflon pipe, the processing gas supply pipe 108 is not easily corroded by NOx. Therefore, there is no possibility that contaminants due to corrosion of the processing gas supply pipe 108 enter the processing chamber 103a.
- the processing gas containing oxygen atom radicals is moved to the ceiling of the reaction tube 102.
- the reaction tube 102 is formed in a single tube structure, and since a gap D is provided between the inner wall of the reaction tube 102 and the end of the wafer 106, a predetermined exhaust conductance is obtained and ozone is lost. It becomes difficult to activate (it becomes possible to maintain the activated state of ozone). Further, the inside of the processing chamber 103a can be easily maintained at a low pressure. In addition, the tip 108a Is bent so that the processing gas is supplied above the reaction tube 102 through the outside of the processing area 103b. For this reason, the conductance in the processing chamber 103a can be improved, and the activated state of ozone can be maintained, and the inside of the processing chamber 103a can be easily maintained at a low pressure.
- the processing gas that has reached the ceiling of the reaction tube 102 is supplied to the processing region 103b by suction from the vacuum pump 116.
- the pressure in the processing chamber 103a is maintained at a low pressure of 13.3 Pa to 26600 Pa (lTorr to 200 Torr)
- the processing gas can be uniformly supplied to the processing region 103b.
- the processing gas can be uniformly supplied to the processing region 103b. This is because the flow rate of the processing gas becomes slower and the processing gas is not affected by the flow rate when it is supplied to the processing area 103b.
- the exhaust port 113 is disposed so as to face the processing gas supply pipe 108, the influence of the processing gas supplied from the processing gas supply pipe 108 when supplying the processing gas to the processing area 103b is reduced.
- the exhaust conductance in the processing chamber 103a can be improved. Therefore, the activated state of ozone can be maintained, and the processing gas can be uniformly supplied to the processing region 103b.
- the organic substances attached to the wafer 106 are decomposed by the oxygen atom radicals in the processing gas, and the organic substances are removed from the wafer 106. Note that the removed organic matter is sucked into the exhaust pipe 114 through the exhaust port 113 and exhausted to the outside of the reaction tube 102.
- the supply of the processing gas (nitrogen gas, oxygen gas, ozone) from the processing gas supply pipe 108 is stopped. Then, while controlling the opening of the combination valve 115, the vacuum pump 116 is driven to discharge the gas in the processing chamber 103a, and then a predetermined flow rate of nitrogen gas, for example, 10 liters, is supplied from the purge gas supply pipe 117. / min to discharge the gas in the processing chamber 103a to the exhaust pipe 114.
- the supply of the nitrogen gas from the purge gas supply pipe 117 is performed, for example, for 10 minutes (purge step). In order to ensure that the gas in the processing chamber 103a is discharged, the discharge of the gas in the processing chamber 103a and the supply of nitrogen gas should be repeated several times. Is preferred.
- a nitrogen gas is supplied from the purge gas supply pipe 117 at a predetermined flow rate, for example, 20 liters / min for about 5.5 minutes, and the inside of the processing chamber 103a is at normal pressure (760 Torr). And unload the wafer boat 105 loaded with the wafer 106 from the processing chamber 103a (about one door opening).
- the sample of the wafer 106 to which the organic substance was adhered was cleaned under various conditions.
- An oxide film with a thickness of 100 angstroms is formed on wafer 1 at 6, and the surface of this oxide film is washed with diluted hydrofluoric acid (DHF) for 1 minute, and then placed in a clean room.
- DHF diluted hydrofluoric acid
- the amount of organic matter deposited was measured using the contact angle method.
- five points on the wafer 106 were measured, and the average value was obtained.
- the contact angle of the prepared sample was 36 °.
- the contact angle of the pure water ball does not become 0 °, and it is difficult to perform a precise measurement at a low angle. Therefore, it is considered that organic substances were almost completely removed from the wafer 106 having a contact angle of 2 degrees or less.
- Example 7 300 26 600 30 7.05 ⁇ 2 3 1.4 1.4 1.3 Crane example 8 300 133 5 7.05 ⁇ 2 3 1.5 1.4 1.9
- Example 9 300 133 30 2.35 ⁇ 2 3 1.7 1.6 1.8
- Example 10 300 133 30 14.1 ⁇ 2 3 1.2 1.2 1.0 Tsuru 11 300 133 30 7.05 ⁇ 2 100 1.5 1.2 1.3 Difficult 12 300 133 30 7.05 co 2 3 2.0 1.3 1.3 Difficult 13 300 133 30 7.05 co 2 100 2.0 1.3 1.5 it ⁇ !
- Table 2 shows the cleaning conditions. As shown in Table 2, the temperature of the processing chamber 103a (Examples 1 to 4, Comparative Example 2, and Comparative Example 3), the pressure of the processing chamber 103a (Example 7), and the cleaning time (Example 8) The cleaning is performed by changing the ozone concentration in the processing gas (Examples 9 and 10), the type of additive gas (Examples 12 and 13), etc., and the temperature, pressure and time are cleaned. The effect on the effect was investigated. In addition, here, in order to facilitate the experiment, wafers 106 are stored one by one (total of 3 wafers) in the three places of upper (T), center (C) and lower (B) of wafer boat 105. The test was performed.
- Example 5 and Example 6 in Table 2 and FIG. 6 when the temperature of the processing chamber 103a is 200 ° C. and the pressure of the processing chamber 103a is low (133 Pa), Can reduce the amount of carbon adhering to about 1/3 compared to the conventional cleaning with oxygen gas (Comparative Example 1). In the case of high pressure (2660 OPa), it is possible to almost completely remove the organic substances adhering to the wafer 106. Can be.
- the temperature of the processing chamber 103a is 200 ° C.
- the pressure of the processing chamber 103a by setting the pressure of the processing chamber 103a to 26600 Pa, organic substances attached to the wafer 106 can be almost completely removed.
- a pressure of 103 a of 133 Pa organic substances cannot be almost completely removed.
- the temperature of the processing chamber 103a is set higher than 600 ° C., it is possible to almost completely remove the organic substances adhered to the wafer 106, but the wafer 106 may be thermally oxidized.
- the temperature of the processing chamber 103a becomes the same as that of the conventional cleaning method. For this reason, the temperature of the processing chamber 103a is more preferably set to 300 ° C to 500 ° C.
- the pressure in the processing chamber 103a is preferably set to 133 Pa to 2660 OPa.
- the cleaning time was 5 minutes to 30 minutes, it was confirmed that the organic substances attached to the wafer 106 were almost completely removed. If the cleaning time is shorter than 5 minutes, the organic substances adhering to the wafer 106 may not be almost completely removed.If the cleaning time is longer than 30 minutes, the wafer 106 can be efficiently cleaned. It's gone. For this reason, the cleaning time is preferably set to 5 to 30 minutes. However, it is possible to further lengthen or shorten this time depending on the amount of the organic substance adhering to the wafer 106.
- Example 1 and Example 11 in Table 2 and FIG. 6 even if the number of wafers 106 in wafer boat 105 is changed from three to 100, it adheres to wafer 106. It was confirmed that there was no effect on the removal of the organic matter. This is because the conductance in the processing chamber 103a is improved and the pressure in the processing chamber 103a is maintained at a low pressure. For this reason, even if the number of wafers 106 in the wafer boat 105 increases to, for example, 100, the pressure in the processing chamber 103a, the cleaning time, and the ozone concentration in the processing gas. Shows a similar tendency.
- the contact angle method is generally susceptible to the surface condition of the plane (wafer 106) on which pure water is dropped, and if the surface shape of the wafer 106 changes due to cleaning, the amount of organic matter attached will be accurate. Therefore, the surface shape of the wafer 106 before and after cleaning was confirmed. As a result, it is confirmed that the surface shape of the wafer 106 has hardly changed before and after cleaning.
- the processing chamber 103 a is heated to a temperature at which ozone can be activated (200 ° C. or higher), and ozone is introduced into the processing chamber 103 a. Since the processing gas containing the gas is supplied, the efficiency of removing organic substances attached to the wafer 106 can be improved as compared with the conventional cleaning using oxygen gas.
- the processing chamber 103 a is heated to 300 ° C. to 500 ° C., and the processing chamber 103 a contains ozone. By supplying the gas, the efficiency of removing organic substances attached to the wafer 106 at a lower temperature can be improved as compared with the conventional cleaning using oxygen gas.
- the reaction tube 102 is formed in a single tube structure, and the space D is provided between the inner wall of the reaction tube 102 and the end of the wafer 106, so that ozone It becomes easier to maintain the activated state.
- the inside of the processing chamber 103a can be easily maintained at a low pressure, and the processing gas can be uniformly supplied to the processing region 103b. Therefore, the organic substances adhering to the plurality of wafers 106 can be simultaneously removed by one cleaning process.
- the processing gas is allowed to reach the ceiling of the reaction tube 102 once and is supplied to the processing region 103 b by suction from the vacuum pump 116, so that the processing region 103 b Process gas can be supplied uniformly.
- the ozone generator 109 is supplied with nitrogen gas in addition to oxygen gas, the generation efficiency of ozone generated by the ozone generator 109 is improved.
- the film-forming gas supply pipes 122 are arranged in the non-processing region 103 c and communicate with the side surfaces of the manifold 103.
- the deposition gas supply pipes 122 are connected to a combustion device (not shown).
- the combustion device generates steam by burning oxygen gas and hydrogen gas, and supplies the steam to the deposition gas supply pipe 122.
- the film-forming gas supply pipe 122 is formed in a bent shape such that its tip portion 122a faces the direction (upward) of the processing region 103b. For this reason, the film forming gas supplied from the film forming gas supply pipe 122 is jetted upward from the reaction tube 102.
- the leading end portion 122 a of the film forming gas supply tube 122 holds the film forming gas ejected upward, A position that is supplied outside the processing region 103 b (for example, the space formed by the gap D shown in FIG. 7) and above the processing region 103 b (the upper part of the reaction tube 102). It is arranged in.
- the inside of the processing chamber 103a is heated to a predetermined temperature, for example, 750 ° C. by the heating heater 107. And, this decompression and heating operation, The process is performed for a predetermined time so that the inside of the processing chamber 103 a is stabilized at a predetermined pressure and temperature (first purge step).
- the steam since the steam has once reached the ceiling of the reaction tube 102, the steam can be uniformly supplied to the processing region 103b. For this reason, a uniform silicon oxide film can be formed on the wafer 106.
- the removal of the organic matter attached to the wafer 106 (cleaning step) and the formation of the silicon oxide film on the wafer 106 from which the organic matter was removed (thin film formation step) are performed by the same single heat treatment apparatus 121.
- a silicon oxide film can be easily formed on the wafer 106.
- the organic material is transferred to the wafer 106 between the cleaning process and the thin film forming process. There is no risk of adhesion.
- nitrogen gas is supplied from the purge gas supply pipe 117 at a predetermined flow rate, for example, 20 liters / min for about 5.5 minutes, and the inside of the processing chamber 103a is set to normal pressure (76 OT or r) and the wafer boat 105 (wafer 106) is unloaded from the processing chamber 103a.
- the batch-type vertical heat treatment apparatus 101 is used to remove organic substances attached to the wafer 106, but a single-wafer heat treatment apparatus may be used. Also in this case, the organic substances attached to the wafer 106 can be efficiently removed at a low temperature.
- the removal of the organic substances attached to the wafer 106 and the formation of the silicon oxide film on the wafer 106 were performed by the same one heat treatment apparatus 122. May be performed in separate devices.
- a silicon oxide film is formed by supplying water vapor to the wafer 106 from which organic substances have been removed.
- a silicon oxide film is formed by supplying ozone to the wafer 106 from which organic substances have been removed. May be.
- the film forming gas supply pipe 122 becomes unnecessary, and the structure of the heat treatment apparatus 121 can be simplified.
- the thin film formed on the wafer 106 is not limited to a silicon oxide film, but may be another thin film, for example, a silicon nitride film.
- the processing gas supply pipe 108 (deposition gas supply pipe 122) is disposed in the non-processing area 103c, and the processing gas (deposition gas) is supplied to the reaction tube.
- the processing gas film formation gas
- a processing gas supply pipe 108 (deposition gas supply pipe 122) may be arranged on the ceiling of the 02 to supply a processing gas (deposition gas) to the processing area 103b.
- the end portion 1 2 2 a of the deposition gas supply pipe 1 2 2) is in the non-processing region 103 c, but the length of this portion is arbitrary and longer than the lengths shown in FIGS. May be shorter No.
- the processing gas introduction part 8b (the tip part 122a) may be a porous (dispersed) nozzle.
- the loading temperature and the cleaning temperature are substantially equal.
- the cleaning temperature in the second embodiment is preferably set to 300 ° C. In this case, the temperature operation for the cleaning step is not required.
- the cleaning step may be performed during the temperature rise from the loading temperature to the film forming temperature.
- the cleaning step and the temperature rise to the film formation temperature can be performed simultaneously, and the time for forming the thin film on the wafer 106 can be shortened.
- the ozone generator 109 is not limited to one supplied with oxygen gas, nitrogen gas or carbon dioxide gas.
- the oxygen gas supply pipe 111 may be connected to the purifier 110 to supply only the oxygen gas to the ozone generator 109.
- ozone can be generated by the ozone generator 109.
- the number of the processing gas supply pipes 108 and the film formation gas supply pipes 122 is not limited to one, and may be plural.
- the object to be processed is not limited to the wafer 106, and may be, for example, a glass substrate.
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Description
Claims
Priority Applications (3)
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EP01999967A EP1351283A4 (en) | 2000-12-05 | 2001-12-04 | METHOD AND DEVICE FOR TREATING AN ARTICLE TO BE TREATED |
KR1020037007373A KR100886997B1 (ko) | 2000-12-05 | 2001-12-04 | 피처리체의 처리방법 및 처리장치 |
US10/433,423 US7208428B2 (en) | 2000-12-05 | 2001-12-04 | Method and apparatus for treating article to be treated |
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JP2000370023A JP4626912B2 (ja) | 2000-12-05 | 2000-12-05 | 被処理体の処理方法、処理装置、薄膜形成方法及び薄膜形成装置 |
JP2000-370023 | 2000-12-05 | ||
JP2001-26233 | 2001-02-02 | ||
JP2001026233A JP4607347B2 (ja) | 2001-02-02 | 2001-02-02 | 被処理体の処理方法及び処理装置 |
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WO2002047142A1 true WO2002047142A1 (fr) | 2002-06-13 |
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US (1) | US7208428B2 (ja) |
EP (1) | EP1351283A4 (ja) |
KR (1) | KR100886997B1 (ja) |
CN (1) | CN100372076C (ja) |
TW (1) | TW541595B (ja) |
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Also Published As
Publication number | Publication date |
---|---|
CN1502120A (zh) | 2004-06-02 |
KR100886997B1 (ko) | 2009-03-04 |
US20040219793A1 (en) | 2004-11-04 |
TW541595B (en) | 2003-07-11 |
EP1351283A4 (en) | 2006-01-25 |
EP1351283A1 (en) | 2003-10-08 |
US7208428B2 (en) | 2007-04-24 |
KR20030062366A (ko) | 2003-07-23 |
CN100372076C (zh) | 2008-02-27 |
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