WO2002091447A1 - Traitement thermique de semi-conducteur et systeme a cet effet - Google Patents
Traitement thermique de semi-conducteur et systeme a cet effet Download PDFInfo
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- WO2002091447A1 WO2002091447A1 PCT/JP2002/002327 JP0202327W WO02091447A1 WO 2002091447 A1 WO2002091447 A1 WO 2002091447A1 JP 0202327 W JP0202327 W JP 0202327W WO 02091447 A1 WO02091447 A1 WO 02091447A1
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- gas
- chamber
- heater
- processing
- heating
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 81
- 239000007789 gas Substances 0.000 claims abstract description 253
- 238000010438 heat treatment Methods 0.000 claims abstract description 175
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 51
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 51
- 238000002485 combustion reaction Methods 0.000 claims abstract description 31
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000011261 inert gas Substances 0.000 claims abstract description 7
- 230000004913 activation Effects 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 183
- 238000011282 treatment Methods 0.000 claims description 84
- 230000008569 process Effects 0.000 claims description 69
- 238000007254 oxidation reaction Methods 0.000 claims description 59
- 230000003647 oxidation Effects 0.000 claims description 58
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 44
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000000758 substrate Substances 0.000 claims description 31
- 238000009279 wet oxidation reaction Methods 0.000 claims description 30
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 26
- 238000009423 ventilation Methods 0.000 claims description 25
- 238000009826 distribution Methods 0.000 claims description 24
- 238000005247 gettering Methods 0.000 claims description 18
- 239000010453 quartz Substances 0.000 claims description 18
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 17
- 239000000460 chlorine Substances 0.000 claims description 17
- 229910052801 chlorine Inorganic materials 0.000 claims description 17
- 230000001590 oxidative effect Effects 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000009940 knitting Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 2
- 239000003575 carbonaceous material Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 62
- 235000012431 wafers Nutrition 0.000 description 127
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 38
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 20
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 20
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 20
- 229960001730 nitrous oxide Drugs 0.000 description 19
- 229910052814 silicon oxide Inorganic materials 0.000 description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 15
- 239000010703 silicon Substances 0.000 description 15
- 229910052710 silicon Inorganic materials 0.000 description 15
- 239000001272 nitrous oxide Substances 0.000 description 14
- 230000002093 peripheral effect Effects 0.000 description 13
- 238000000354 decomposition reaction Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 9
- 239000000498 cooling water Substances 0.000 description 9
- 230000007423 decrease Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000010790 dilution Methods 0.000 description 6
- 239000012895 dilution Substances 0.000 description 6
- 239000012212 insulator Substances 0.000 description 5
- 235000013842 nitrous oxide Nutrition 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 3
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- 230000000052 comparative effect Effects 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 3
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- 150000002739 metals Chemical class 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- LGXVIGDEPROXKC-UHFFFAOYSA-N 1,1-dichloroethene Chemical group ClC(Cl)=C LGXVIGDEPROXKC-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/324—Thermal treatment for modifying the properties of semiconductor bodies, e.g. annealing, sintering
-
- 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
- H01L21/67103—Apparatus for thermal treatment mainly by conduction
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
-
- 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
- C30B33/02—Heat 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
- H01L21/67—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
-
- 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
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67248—Temperature monitoring
-
- 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
- H01L21/67242—Apparatus for monitoring, sorting or marking
- H01L21/67253—Process monitoring, e.g. flow or thickness monitoring
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S438/00—Semiconductor device manufacturing: process
- Y10S438/909—Controlled atmosphere
Definitions
- the present invention relates to a semiconductor processing heat treatment apparatus and method for performing heat treatment on a substrate to be processed such as a semiconductor wafer.
- semiconductor processing refers to forming a semiconductor layer, an insulating layer, a conductive layer, and the like in a predetermined pattern on a substrate to be processed such as a semiconductor wafer or an LCD substrate. It means various processes performed to manufacture a structure including a semiconductor device II, a wiring connected to the semiconductor device, an electrode, and the like on a processing substrate.
- a vertical heat treatment apparatus In semiconductor processing, a vertical heat treatment apparatus is known as a patch-type processing apparatus for performing heat treatment such as oxidation, diffusion, annealing, and CVD on a large number of semiconductor wafers at a time.
- a vertical heat treatment apparatus a large number of wafers are arranged and held at regular intervals in a holder called a wafer boat, and the holder is carried into a vertical processing chamber. Then, heat treatment is performed while heating the wafer by a heating mechanism arranged around the processing chamber.
- dry oxidation and wet oxidation are known as processes for oxidizing a silicon wafer to form a silicon oxide film (SiO 2 film).
- oxygen (O 2) gas and hydrogen chloride (HC 1) gas are supplied to the treatment chamber.
- HC 1 gas In jet oxidation treatment, water vapor and oxygen gas are supplied to the treatment chamber. Either of the dry oxidation treatment and the wet oxidation treatment is selected depending on the quality of the target film.
- oxygen gas oxidizes silicon wafers and layers, while chlorine gettering effect removes surface impurities.
- a large number of wafers are held in a shelf on a wafer boat and carried into a vertical processing chamber to form a processing atmosphere at a predetermined temperature.
- oxygen gas and hydrogen chloride gas are supplied into the processing chamber from the ceiling of the processing chamber at room temperature, and exhausted from the lower side.
- an external combustor is required outside the processing chamber.
- a part of the oxygen gas and hydrogen (H 2 ) gas are burned in the combustor to generate steam, and the remaining oxygen and steam are supplied into the processing chamber.
- oxynitridation is also known.
- dinitrogen monoxide gas N 2 O gas
- N 2 O gas is introduced into the processing chamber at room temperature and reacted with the silicon layer of the wafer to form a silicon oxide film containing nitrogen.
- An object of the present invention is to provide a heat treatment apparatus and method for semiconductor processing that can lower the process temperature when heat treatment such as oxidation treatment is performed on a substrate to be processed.
- a first aspect of the present invention is a heat treatment apparatus for semiconductor processing
- a processing chamber for storing a substrate to be processed
- a support member disposed in the processing chamber and supporting the substrate to be processed
- the supply system includes:
- a combustor having a combustion chamber disposed outside the processing chamber, wherein the combustor reacts hydrogen gas and oxygen gas in the combustion chamber to generate steam and supply the water vapor to the processing chamber;
- a heater having a heating chamber disposed outside the processing chamber, wherein the heater selectively heats the gas that does not pass through the combustion chamber to a temperature above an activation temperature and supplies the gas to the processing chamber.
- a gas distributor for selectively supplying hydrogen gas and oxygen gas to the combustion chamber and selectively supplying a reactive gas and an inert gas to the heating chamber;
- a second aspect of the present invention is a heat treatment apparatus for semiconductor processing
- a processing chamber for storing a substrate to be processed
- a support member disposed in the processing chamber and supporting the substrate to be processed
- a supply system for supplying a processing gas into the processing chamber With
- the supply system includes:
- a combustor having a combustion chamber disposed outside the processing chamber, wherein the combustor reacts hydrogen gas and oxygen gas in the combustion chamber to generate steam and supply the water vapor to the processing chamber;
- a heater having a heating chamber disposed outside the processing chamber; and the heater selectively heating a gas that does not pass through the combustion chamber in the heating chamber and supplying the gas to the processing chamber.
- a control unit that controls the combustor, the heater, and the gas distribution unit so as to selectively use the combustor and the heater.
- a third aspect of the present invention is a heat treatment method for semiconductor processing
- the substrate to be processed is oxidized by reacting hydrogen gas and oxygen gas with a combustor having a combustion chamber provided outside the processing chamber and supplying the gas to the processing chamber while generating water vapor. Forming an oxide film by performing a wet oxidation process; By supplying the reactive gas to the processing chamber while heating the reactive gas to a temperature higher than the activation temperature by a heater having a heating chamber disposed outside the processing chamber, Performing a first treatment other than the wet oxidation treatment by
- FIG. 1 is a vertical side view showing a vertical heat treatment apparatus according to an embodiment of the present invention.
- FIG. 2 is an exploded perspective view showing a processing unit used in the heat treatment apparatus shown in FIG.
- FIG. 3 is a cross-sectional view showing a combustor used in the heat treatment apparatus shown in FIG.
- FIG. 4 is a cross-sectional view showing a heater used in the heat treatment apparatus shown in FIG.
- FIGS. 5A to 5C are explanatory diagrams showing gas supply states in a combustor and a heater for different processes.
- FIGS. 6A and 6B are explanatory diagrams showing gas supply states in a combustor and a heater for different processes.
- FIGS. 7A and 7B are characteristic diagrams respectively showing the inter-plane uniformity and the in-plane uniformity, which are the experimental results when the dry oxidation treatment was performed using the heat treatment apparatus shown in FIG.
- FIGS. 8A and 8B are characteristic diagrams showing experimental results when the oxynitriding treatment was performed using the heat treatment apparatus shown in FIG. 1 and turning the heaters on and off, respectively.
- FIG. 9 shows a diluted wet oxidation treatment using the heat treatment apparatus shown in FIG.
- FIG. 6 is a characteristic diagram showing an experimental result when the process is performed.
- FIGS. 10A to 10C are explanatory diagrams for explaining the problems of the conventional dry oxidation treatment.
- the present inventors studied problems such as dry oxidation treatment, wet oxidation treatment, and oxynitridation treatment in a vertical heat treatment apparatus. As a result, the present inventors have obtained the following findings.
- In-plane uniformity is reduced. This decrease in the in-plane uniformity becomes more remarkable as the diameter of the wafer increases.
- the uniformity of processing between a plurality of substrates for example, between an upper wafer and a lower wafer in a batch process
- FIGS. 10A to 10C are explanatory diagrams for explaining the problems of the conventional dry oxidation treatment.
- 1OA schematically shows the gas flow on the wafer W
- FIG. 1OB schematically shows the temperature of the wafer W
- FIG. 10C schematically shows the film thickness of the wafer W.
- the silicon oxynitride film is formed by the decomposition of nitrous oxide gas and the reaction of oxygen and silicon to form a silicon oxide film and the decomposition. It grows when activated nitrogen species enter the silicon oxide film.
- the temperature of the wafer W becomes higher toward the center. If the process temperature is low, nitrous oxide is not sufficiently decomposed on the upper side of the wafer port. For this reason, in the upper wafer W, the decomposition reaction is promoted as the nitrous oxide flows toward the center, and as a result, in the upper wafer W, the film thickness in the center is thick, so to speak, Film thickness distribution (poor in-plane uniformity).
- the lower stage of the wafer boat Since the nitrous oxide gas is warmed toward the lower side of the reaction tube, the lower stage of the wafer boat has a sufficient force to decompose the gas or, if not to a greater extent, the upper stage. Promoted. Therefore, in the lower wafer W, when the nitrous oxide gas flows from the peripheral portion to the central portion of the wafer w, the difference in gas decomposition depending on the position of the wafer W is small. Therefore, the difference in film thickness due to the difference in gas decomposition is also small. From the above, the in-plane uniformity of the thickness of the silicon oxynitride film becomes better as the wafer W on the lower side becomes more uniform. As described above, when the process temperature is lowered, the in-plane uniformity of the processing performed on the upper wafer tends to decrease, and the uniformity between wafer surfaces tends to decrease. For this reason, it is currently difficult to lower the process temperature.
- FIG. 1 is a vertical side view showing a vertical heat treatment apparatus according to an embodiment of the present invention.
- This heat treatment apparatus has a vertical heat treatment unit 11, a combustor 12, a heater 13, and a gas distribution unit 14 controlled under the control of a main control unit 57.
- This heat treatment apparatus can selectively perform wet oxidation treatment, dry oxidation treatment, and oxynitridation treatment.
- hydrogen gas and oxygen gas are burned by a combustor 12 to generate steam, and the steam is used to oxidize the wafer.
- a heater 13 heats oxygen gas (oxidizing gas) and hydrogen chloride gas (a compound gas containing hydrogen and chlorine: gettering gas), and oxidizes the wafer using this gas.
- dinitrogen monoxide gas oxynitriding gas
- oxynitriding gas dinitrogen monoxide gas
- oxynitriding gas dinitrogen monoxide gas
- FIG. 2 is an exploded perspective view showing a processing unit 11 used in the heat treatment apparatus shown in FIG. As shown in FIGS. 1 and 2, the processing unit 11 has a vertical heat treatment furnace 2.
- a gas distributor 14 is connected to the heat treatment furnace 2 via a first gas supply pipe 41.
- a wafer port 3 which is a support or a holder for the wafer W is removably disposed in the heat treatment furnace 2 to which exhaust means 15 is connected via an exhaust pipe 20.
- the wafer port 3 is moved up and down by a wafer boat elevator 30 arranged below the heat treatment furnace 2.
- the vertical heat treatment furnace 2 includes, for example, a vertical reaction tube (processing chamber) 21 made of quartz and having an open lower end.
- a soaking tube 23 is provided between the reaction tube 21 and the heater 22. The soaking tube 23 is supported by the heat insulator 2 at the lower end.
- a gas diffusion plate 21 c having a large number of gas holes 21 b is provided slightly below the upper wall 21 a.
- the first gas supply pipe 41 penetrates the heat insulator 24 from outside, is bent into an L shape inside the heat insulator 24, and stands vertically between the reaction tube 21 and the soaking tube 23. Can be raised. The distal end of the first gas supply pipe 41 protrudes into the space between the upper wall 21a of the reaction pipe 21 and the gas diffusion plate 21c.
- the wafer boat 3 has, for example, a top plate 31, a bottom plate 32, and a plurality of columns 33 connecting between them. A plurality of grooves are formed in the column 33 at intervals in the vertical direction, and the edges of the wafer W are inserted into these grooves to hold the wafer W horizontally.
- the wafer boat 3 is placed on a lid 34 that opens and closes an opening 25 at the lower end of the reaction tube 21 via a heat insulating member, for example, a heat insulating cylinder 35.
- Heat insulation tube 3 5 It is placed on a table 36 and is rotated via a rotating shaft 37 by a driving unit M provided in the elevator 30.
- the lid 34 is attached to the elevator 30, and as the elevator 30 moves up and down, the wafer boat 3 is carried in and out of the heat treatment furnace 2.
- FIG. 3 is a sectional view showing a combustor 12 used in the heat treatment apparatus shown in FIG.
- the combustor 12 is connected outside the vertical heat treatment unit 11 and upstream of a first gas supply pipe 41 made of, for example, quartz.
- the combustor 12 has, for example, a concentric double structure 50 composed of an inner tube 51a and an outer tube 51b made of transparent quartz.
- An inner heating space 52A is formed inside the inner tube 51a, and an outer heating space 52B is formed between the inner tube 51a and the outer tube 51b.
- the inner heating space 52A communicates with the first gas inlet pipe 71 in a state of being extended as it is.
- the outer heating space 52B is narrowed on the upstream side and communicates with a second gas introduction pipe 72 extending perpendicularly from the narrowed portion.
- the gas flow path from the heating space 52B to the reaction pipe 21 via the first gas supply pipe 41 corresponds to a first gas flow path.
- a helical carbon wire heater 53 for example, is provided around the outer periphery of the outer heating space 52 B and is covered with a tubular heat insulator 54.
- the heater 53 includes, for example, a string-like body formed by knitting a plurality of bundles of carbon fiber containing few metallic impurities. And a spiral quartz tube for accommodating and sealing the string.
- the heater 53 generates heat by a voltage applied via a power supply line 55 connected to the power control unit 56.
- the power control unit 56 includes, for example, a signal corresponding to the set heating temperature specified by the main control unit 57 that controls the heat treatment apparatus, and a temperature sensor 58 that includes a thermocouple provided near the heater 53, for example. The amount of power to the heater 53 is controlled on the basis of the temperature detection signals and.
- the inner heating space 52A and the outer heating space 52B communicate with the downstream combustion chamber 59.
- the hydrogen gas and oxygen gas undergo a combustion reaction in the combustion chamber 59 to generate steam.
- FIG. 4 is a sectional view showing a heater 13 used in the heat treatment apparatus shown in FIG.
- the heater 13 is branched from the first gas supply pipe 41 between the vertical heat treatment unit 11 and the combustor 12, and is made of, for example, quartz. Connected to the upstream side of the second gas supply pipe 42.
- the heater 13 has a heating chamber 61 made of, for example, transparent quartz connected to the second gas supply pipe 42.
- the heating chamber 61 has a cylindrical heating shape having an inner diameter larger than the inner diameter of the third gas introduction pipe 73 for introducing the processing gas and elongated in the gas ventilation direction. It is composed of tubes.
- the gas flow path from the third gas introduction pipe 73 to the reaction pipe 21 via the heating chamber 61 and the second gas supply pipe 42 corresponds to a second gas flow path.
- the heating chamber 61 functions as a heating medium by being heated, and imparts ventilation resistance to the gas passing therethrough.
- a ventilation resistance member 62 is provided.
- the ventilation resistance member 62 is composed of an aggregate of many pieces such as quartz ceramics.
- the ventilation resistance member 62 is formed by fusing a large number of quartz pieces (for example, beads).
- the inner diameter of the second gas supply pipe 42 is, for example, 20 mm
- the inner diameter of the heating chamber 61 is, for example, 6 Omn! 88 O mm
- the length in the ventilation direction is, for example, about 100 mm ⁇ 200 mm
- the size of each quartz piece filled in the heating chamber 61 is, for example, about ⁇ 1 ⁇ 10. is there.
- a carbon wire heater 63 serving as a heating means is spirally wound around the outer periphery of the heating chamber 61.
- the heater 63 has, for example, a string-shaped body formed by knitting a plurality of bundles of carbon fibers having a small amount of metal impurities, and a spiral quartz tube for accommodating and sealing the string-shaped body.
- reference numerals 64 and 65 indicate a power supply unit and terminals for the heater 63.
- the heating chamber 61 and the heater 63 are covered with a cylindrical casing 60 made of, for example, a sintered heat insulator of high-purity silicon oxide (SiO 2 ).
- the casing 60 is provided with, for example, a cooling jacket 66 for flowing a coolant such as cooling water along the heater 63 (along the ventilation direction). Cooling water is supplied to the cooling jacket 66 by a cooling water supply unit 67.
- a temperature detector 68 for example, a thermocouple is provided between the cooling jacket 66 and the heater 63 inside the casing 60. Based on the internal temperature detected by the thermocouple 68, the main control unit 57 supplies power to the power supply unit 64 via the supply amount control unit 69 and cooling.
- a control signal is output to the water supply section 67.
- the amount of power supplied to the heater 63 and the amount of cooling water supplied to the cooling jacket 66 are controlled. That is, the heating chamber 61 is adjusted to a predetermined temperature by the interaction between the heating of the heater 63 and the cooling of the cooling jacket 66.
- the heating chamber 61 of the heater 13 and the ventilation resistance member 62 filled therein form a heat exchange section for passing gas. That is, the processing gas is introduced from the third gas introduction pipe 73 into the heating chamber 61 adjusted to a predetermined temperature, and the processing gas is brought into contact with the heated ventilation resistance member 62, thereby causing the processing gas to flow. Can be preheated to a predetermined high temperature of 300-1100 ° C, typically 800-10000 ° C.
- a gas distributor 14 is provided upstream of the combustor 12 and the heater 13. That is, the first gas introduction pipe 71, the second gas introduction pipe 72, and the third gas introduction pipe 73 are provided with an opening / closing valve VA, a valve VB, and a valve VC, respectively.
- the first gas introduction pipe 71 is connected to a hydrogen gas source 81, and on the way there is provided a mass flow controller MF, 1 which is a valve V1 and a flow rate adjusting section.
- the second gas introduction pipe 72 is connected to an oxygen gas source 82, and a valve V2 and a mass flow controller MF2, which is a flow rate adjusting unit, are provided on the way.
- the third gas introduction pipe 73 is branched into, for example, four pipes and connected to a nitrogen gas source 83, a dinitrogen monoxide gas source 84, a hydrogen chloride gas source 85, and an oxygen gas source 86.
- the four branch pipes include valves V 3, V 4, V 5 V 6 and mass flow controllers MF 3, MF 4, MF 5, MF 6 will be provided respectively.
- the oxygen gas sources 82 and 86 may be common.
- a wet oxidation process, a dry oxidation process, and an oxynitridation process can be selectively performed on a wafer, which is a substrate whose silicon layer is exposed on the surface.
- a wafer which is a substrate whose silicon layer is exposed on the surface.
- the operation and effects of the dry oxidation, gettering, oxynitridation, wet oxidation, and diluted wet oxidation will be described below in order.
- the main control unit 57 By selecting the dry oxidation process in the main control unit 57, the main control unit 57 power supply, the processing unit 11, the combustor 12, the heater 13, and the gas distribution unit 14 are controlled. An operation signal for dry oxidation is sent.
- a large number, for example, 25 to 150 semiconductor wafers W as substrates to be processed are held in a shelf on the wafer boat 3, and a predetermined temperature is previously set by the heater 22.
- the wafer is loaded into the heated reaction tube 21 by the wafer boat elevator 30, and the opening 25, which is a furnace, is hermetically closed by the lid 34 (the state shown in FIG. 1).
- the inside of the reaction tube 21 is heated up to a predetermined process temperature, for example, 800 ° C., and is stabilized.
- the step of loading the wafer W and the step of raising the temperature inside the reaction tube 21 for example, nitrogen gas mixed with a slight amount of oxygen gas is supplied into the reaction tube 21 from a gas supply tube (not shown). I do.
- a gas supply tube not shown
- the gas supply is stopped,
- the inside of the reaction tube 21 is exhausted by the exhaust means 15 via the exhaust pipe 20.
- the inside of the reaction tube 21 is brought into a slightly reduced pressure state, and in this state, the temperature of the wafer W is stabilized, and then the oxidation treatment is performed.
- the heater 13 is turned on, and the amount of power supplied to the heater 63 and the water cooling are set so that the inside of the heating chamber 61 becomes, for example, a set temperature of 100 ° C.
- the amount of cooling water supplied to the jacket 66 is controlled.
- the pulp V6 and V5 are opened, and the oxygen gas and the hydrogen chloride gas are adjusted to a predetermined flow rate by the mass flow controllers MF6 and MF5, respectively. For example, it flows into the heating chamber 61 at a flow rate of 10 slm and 1 slm.
- the combustor 12 is turned off, and the valves VA and VB on the primary side of the combustor 12 are closed.
- the processing gas flows through the gap through the heat equalizing pipe while contacting the ventilation resistance member 62 in the heating chamber 61, and while passing therethrough, For example, it is heated to around 100 ° C.
- the oxygen gas and the hydrogen chloride gas react as shown in the following formula, and a small amount of water vapor, for example, on the order of several hundreds Ppm is generated.
- the processing gas heated in this way is supplied to the heat treatment furnace 2 via the second supply pipe 42 and the first gas supply pipe 41.
- the processing gas rises while being heated through the inside of the soaking tube 23, and flows into the upper part of the reaction tube 21. Further, the processing gas is supplied from the gas holes 21 b to the processing region in the reaction tube 11, and the lower exhaust pipe 20. It is exhausted from.
- the processing gas enters between the wafers W held in a shelf shape, and performs a predetermined processing on the wafer. That is, while chlorine gas removes (getters) contaminant metals on the wafer surface, oxygen gas oxidizes the silicon layer on the wafer W surface to form a silicon oxide film. .
- This processing gas contains a trace amount of water vapor as described above, and the water vapor grows an oxide film.
- the processing gas from the heater 13 flows into the combustor 12 via the second gas supply pipe 42 and the first gas supply pipe 41.
- the pulp VA provided in the first gas introduction pipe 71 of the combustor and the valve VB provided in the second gas introduction pipe 72 are closed, the pulp only enters the combustion chamber 59, and the combustion chamber 59 is merely inserted. It does not go into the upstream of 59.
- the formed silicon oxide film has excellent characteristics in both the in-plane uniformity and the inter-plane uniformity of the film thickness.
- the processing gas mixed gas of oxygen gas and hydrogen chloride gas
- the heater 13 is heated to about 100 ° C. by the heater 13 and activated, for example, so that it is thermally decomposed.
- the amount of water vapor and chlorine once generated in the process gas does not decrease even at low temperatures.
- steam and chlorine are generated by the heater 13 at a temperature higher than the process temperature in the reaction tube 21, the processing gas becomes second gas supply pipe 4 on the secondary side. 2 and 1st gas supply pipe 41 Is less. Therefore, even if the processing gas is subsequently heated in the reaction tube 21, the processing gas does not generate any more water vapor.
- the processing gas is activated by the heater 13 and sufficiently heated and decomposed, so that the processing gas enters between the wafers W loaded on the wafer boat 3.
- steam and chlorine have been exhausted. Therefore, the amounts of water vapor and chlorine contained in the processing gas flowing from the peripheral part to the central part of the wafer W are almost the same at any position.
- the degree of film formation by water vapor and gettering by chlorine are almost the same on the wafer W located on the upper stage of the wafer boat 3, and the film thickness is uniform in the plane. The property is good.
- the uniformity of the film thickness is poor on the upper side, and the uniformity of the film thickness is lower on the lower side.
- the dry oxidation treatment according to this embodiment the production reaction that occurs in the lower stage without the heater 13 is already generated in the upper stage. Can be done. Therefore, the variation in the film thickness distribution between wafers W is reduced, and the uniformity of the film thickness between the surfaces is improved.
- the temperature at the central portion is higher than that at the peripheral portion of the wafer W, and the film thickness at the central portion tends to increase.
- the hydrogen chloride gas and the oxygen gas are heated by the heater 13 to perform dry oxidation, a function of growing the film in the peripheral region works, and as a result, the uniformity of the film thickness is improved.
- the reasons can be considered as follows. That is, the steam and chlorine obtained in the heater 13 flow in the reaction tube 21 from the peripheral portion of the wafer W toward the central portion. For this reason, it is considered that the concentration of the processing gas becomes slightly lower toward the center. As a result, the degree of film formation and gettering in the peripheral portion is increased, and the effect of increasing the film thickness in the peripheral portion works.
- the processing gas can be sufficiently activated.
- the heating chamber 61 is made of quartz and the heater 63 is made to have a special configuration, so that the heating chamber 61 is heated to a high temperature of 800 ° C. or more, for example. It is possible.
- the heater 63 is composed of, for example, a string-shaped body formed by knitting a plurality of bundles of carbon fibers having a small amount of metal impurities, and a spiral-shaped quartz tube for storing and sealing the string-like body. It has a special structure having and.
- a ventilation resistance member 62 is provided in the heating chamber 61, and the processing gas is brought into contact with the ventilation resistance member 62 for heating, so that the temperature of the processing gas increases efficiently. Since the heating chamber 61 is filled with the ventilation resistance member 62, the processing gas flows through the heating chamber 61 while contacting the ventilation resistance member 62, and the residence time of the processing gas becomes longer. . The processing gas is heated by a combination of heating by convection of the processing gas itself heated by the heater 63 and heating by heat transfer from the ventilation resistance member 62.
- the ventilation resistance member 62 for example, a quartz piece (for example, a bead) having a size of about ⁇ 1 to ⁇ 10 is used. Quartz piece 6 2 Large heat transfer surface area due to large overall surface area As a result, the temperature of the processing gas can be increased efficiently. Since the heating chamber 61 and the second gas supply pipe 42 are connected, the processing gas sufficiently activated in the heating chamber 61 is supplied to the second gas supply pipe 42 while maintaining a high temperature state. You. As a result, the processing gas is supplied to the reaction tube 21 in a state of maintaining a high activity, so that the processing with good in-plane uniformity and inter-plane uniformity of the film thickness is performed as described above. be able to.
- a quartz piece for example, a bead having a size of about ⁇ 1 to ⁇ 10 is used. Quartz piece 6 2 Large heat transfer surface area due to large overall surface area As a result, the temperature of the processing gas can be increased efficiently. Since the heating chamber 61 and the second gas supply pipe 42 are connected,
- Gettering is a process performed to remove contaminant metals from the wafer surface.
- the main control unit 57 power supply, the processing unit 11, the combustor 12, the heater 13, and the gas distribution unit 14 are provided.
- an operation signal for gettering processing is sent.
- a large number of wafers W are held in a shelf shape on the wafer boat 3, and the wafer port elevator is placed in a reaction tube 21 heated in advance to a predetermined temperature by a heater 22. 30, and the opening 25, which is the furnace, is airtightly closed by the lid 34 (the state shown in Fig. 1). Subsequently, the inside of the reaction tube 21 is heated to a predetermined process temperature, for example, 900 ° C., and is stabilized.
- a predetermined process temperature for example, 900 ° C.
- the heater 13 is turned on, and the amount of power supplied to the heater 63 and the water-cooled jacket are set so that the inside of the heating chamber 61 has a set temperature of, for example, 100 ° C.
- the cooling water supply to 66 is controlled.
- the valves V 6 and V 5 are opened, and minute oxygen gas and hydrogen chloride gas are adjusted to predetermined flow rates by the mass flow controllers MF 6 and MF 5, respectively.
- flow into the heating chamber 61 at a flow rate of 0.01 to 1311111 and 0.01 to lslm.
- the combustor 12 is turned off, and the pulp VA and the pulp VB on the primary side of the combustor 12 are closed.
- the processing gas flows through the gaps while contacting the ventilation resistance member 62 in the heating chamber 61 and passes through the gap. For example, it is heated to around 100.
- the processing gas heated in this way is supplied to the heat treatment furnace 2 via the second supply pipe 42 and the first gas supply pipe 41.
- the processing gas enters between the wafers W held in a shelf shape, and performs a predetermined processing on the wafers. That is, contaminant metals on the wafer surface are removed (gettered) by the hydrogen chloride gas and the chlorine gas. After performing the predetermined gettering process in this way, subsequently, for example, a jet oxidation process is performed.
- the hydrogen chloride gas and the oxygen gas are sufficiently heated and activated in heater 13, so that the reaction between the hydrogen chloride and the oxygen gas is performed.
- the reaction products such as hydrogen chloride, chlorine and a small amount of water vapor are mixed, and the gettering effect is large, thereby increasing the efficiency of metal removal from the wafer surface. improves. Therefore, in the case of performing the subsequent oxidation treatment, an oxide film is formed on the surface of the wafer from which the metal has been removed, so that a high-quality film can be obtained.
- the main control unit 57 By selecting the oxynitriding process in the main control unit 57, the main control unit 57, the main control unit
- the operation signal for the oxynitriding process is sent to the processing unit 11, the combustor 12, the heater 13, and the gas distribution unit 14 from the power 57.
- a large number of wafers W are held in a shelf on the wafer boat 3, and the wafer boat elevator 3 is placed in the reaction tube 21 heated to a predetermined temperature in advance by the heater 22. 0, and the opening 25, which is the furnace, is airtightly closed by the lid 34 (the state shown in Fig. 1). Subsequently, the inside of the reaction tube 21 is heated to a predetermined process temperature, for example, 800 ° C., and is stabilized.
- a predetermined process temperature for example, 800 ° C.
- the heater 13 is turned on, and the heater 13 is set so that the inside of the heating chamber 61 has a set temperature of, for example, 900 ° C. to 100 ° C.
- the amount of power supplied to 63 and the amount of cooling water supplied to water-cooled jacket 66 are controlled.
- the valve V 4 is opened and —Nitrous oxide gas is adjusted to a predetermined flow rate by the mass flow controller MF 4, for example, from 1 to 10 s 1 Flow into the heating chamber 61 at a flow rate of m.
- the combustor 12 is turned off, and the pulp VA and the pulp VB on the primary side of the combustor 12 are closed.
- the nitrous oxide gas flows through those gaps through the heat equalizing tube while contacting the ventilation resistance member 62 in the heating chamber 61, and during the passage therethrough. It is heated near the set temperature. As a result, the nitrous oxide gas is preheated to a temperature close to the decomposition temperature, and activated to the extent that it is decomposed immediately after flowing into the reaction tube 21.
- N 2 O * is activated by N 2 O. Shows a sexualized state. The thus activated nitrous oxide gas enters the reaction tube 21 and oxidizes and nitrides the silicon layer of the wafer W to form a silicon oxide film containing nitrogen.
- the formed silicon oxide film containing nitrogen has excellent characteristics in both the in-plane uniformity of the film thickness and the uniformity between the surfaces. It comes to have.
- the reason can be considered as follows. That is, the nitrous oxide gas is heated by the heater 13 at, for example, 900 to about 100 ° C., and is activated to a state immediately before decomposition. Therefore, when the gas enters the reaction tube 21 and reaches the upper side of the wafer boat 3, the decomposition has already progressed considerably. For example, even if the temperature of the reaction tube 21 is low, the nitrous oxide gas is sufficiently activated, and the silicon oxide film can be doped with nitrogen at a high concentration.
- the main control unit 57 supplies the processing unit 11, the combustor 12, the heater 13, and the gas distribution unit 14.
- the operation signal for the jet oxidation treatment is sent.
- the wafer boat elevator 30 is placed in the reaction tube 21 heated to a predetermined temperature in advance by the heater 22. Then, the opening 25, which is a furnace, is hermetically closed by the lid 34 (the state shown in FIG. 1). Subsequently, the inside of the reaction tube 21 is heated to a predetermined process temperature, for example, 900 ° C., and is stabilized.
- a predetermined process temperature for example, 900 ° C.
- the combustor 12 is turned on, and the amount of electric power supplied to the heater 53 is set so that the inside of the heating spaces 52A and 52B has a set temperature of, for example, 900 to 950 ° C. Is controlled.
- the pulp V1 and V2 are opened, and the hydrogen gas and the oxygen gas are adjusted to a predetermined flow rate by the mass flow controllers MF1 and MF2, respectively. For example, flow is made into the combustor 12 at a flow rate of 3 to 10 s 1 m and 3 to 10 slm.
- the heater 13 is turned off, so that power supply to the heater 63 and cooling water supply to the cooling jacket 66 are not performed.
- the valve V 3 is opened, and the nitrogen gas is adjusted to a predetermined flow rate by the mass flow controller MF 3. At a flow rate of, for example, 50 sccm to 500 sccm, it is made to flow into the heat chamber 61. Note that oxygen gas may be flowed into the heating chamber 61 instead of nitrogen gas.
- the hydrogen gas and the oxygen gas are heated in the inner heating space 52 A and the outer heating space 52 B of the combustor 12, respectively. Combustion reaction between the part and hydrogen gas occurs to generate steam.
- the oxygen gas and the water vapor thus generated are supplied to the heat treatment furnace 2 via the first gas supply pipe 41.
- a trace amount of nitrogen gas that has passed through the heater 13 is also supplied to the heat treatment furnace 2 via the second gas supply pipe 42 and the first gas supply pipe 41.
- the mixed processing gas enters between the wafers W held in a shelf shape and performs a predetermined processing on the wafers. That is, the silicon layer on the wafer surface is oxidized by oxygen gas and water vapor to form a silicon oxide film.
- the combustion reaction between a part of the oxygen gas and the hydrogen gas occurs sufficiently in the combustor 12, and the reaction tube 21 is generated in a state where the steam is completely generated. Therefore, the amounts of water vapor and oxygen contained in the processing gas flowing from the peripheral portion to the central portion of the wafer W are almost the same at any position. Since the degree of supply of water vapor and oxygen in the plane of the wafer W is almost the same, the in-plane uniformity of the film thickness is improved even when the process temperature is lowered.
- the second gas supply pipe 42 is made of quartz and has a considerably high temperature when the processing gas is heated by the heater 13, so that the supply and the supply of the gas are stopped. Pulp cannot be provided. Therefore, if gas is not flown from the heater 13 side, steam generated in the combustor 12 will enter the heating chamber 61 through the gas supply pipe 42. Once the water vapor is adsorbed by the ventilation resistance member 62 filled in the heating chamber 61, the water vapor is difficult to remove.
- the diluted wet oxidation treatment is a treatment in which the processing gas containing oxygen and water vapor of the above-described wet oxidation treatment is diluted with a small amount of nitrogen gas and supplied into the reaction tube 21.
- the main control unit 57 selects the dilution / oxidation oxidation process, so that the main control unit 57, the power unit, the processing unit 11, the combustor 12, the heater 13, and the gas distribution unit 14 An operation signal for the dilution / wet oxidation treatment is sent to this.
- a large number of wafers W are held in a shelf shape on the wafer boat 3, and the wafer boat elevator 30 is placed in the reaction tube 21 heated to a predetermined temperature in advance by the heater 22. Then, the opening 25, which is a furnace, is airtightly closed by the lid 34 (the state shown in Fig. 1). Then, at a given process temperature, e.g. For example, the temperature inside the reaction tube 21 is raised to 850 ° C and stabilized.
- the combustor 12 is turned on, and the electric power to the heater 53 is set so that the inside of the heating spaces 52A and 52B has a set temperature of, for example, 900 to 950 ° C.
- the supply is controlled.
- the pulp V1, V2 is opened and the hydrogen gas and the oxygen gas are adjusted to a predetermined flow rate by the mass flow controllers MF1, MF2, respectively.
- the gas flows into the combustor 12 at a flow rate of 3 s 1 m and 3 s 1 m.
- the heater 13 is also turned on, and the amount of power supplied to the heater 63 and the amount of water supplied to the water-cooled jacket 66 are adjusted so that the inside of the heating chamber 61 has a set temperature of, for example, 100 ° C.
- the cooling water supply is controlled.
- the valve V 3 is opened, and the nitrogen gas is adjusted to a predetermined flow rate by the mass flow controller MF 3. 6 Flow into 1.
- the nitrogen gas flows through the gap through the uniformity pipe while contacting the ventilation resistance member 62 in the heating chamber 61. For example, it is heated to around 100 ° C.
- the preheated nitrogen gas is supplied to the first gas supply pipe 41 via the second supply pipe 42, where the processing gas containing oxygen gas and water vapor from the combustor 12 is supplied. Mixed with. Thereby, the processing gas is supplied to the heat treatment furnace 2 in a state diluted with the nitrogen gas.
- the mixed processing gas enters between the wafers W held in a shelf shape, and performs a predetermined processing on the wafer. That is, the silicon layer on the wafer surface is oxidized by the oxygen gas and water vapor, and the silicon oxide film is formed. Is formed.
- the nitrogen gas is sufficiently preheated by heater 13 and then mixed with the processing gas containing oxygen gas and water vapor. For this reason, the situation where the temperature of the processing gas is lowered by the mixing of the nitrogen gas does not occur, and as a result, the processing with good in-plane uniformity of the film thickness can be performed.
- the temperature of the processing gas decreases.
- the film thickness in the vicinity of the peripheral portion of the wafer W tends to decrease.
- the nitrogen gas is sufficiently pre-heated in advance by the heater 13 as in the case of the dilution and jet oxidation treatment according to the present embodiment, a decrease in the temperature of the processing gas can be suppressed, and the film It is possible to prevent the in-plane uniformity of the thickness from decreasing.
- the combustor 12 and the heater 13 are arranged in parallel. Therefore, wet oxidation treatment using the combustor 12; dry oxidation treatment, oxynitridation treatment, and gettering treatment using the heater 13; use both the combustor 12 and the heater 13
- the diluted dilution oxidation treatment can be selectively performed. Moreover, in each process, good results can be obtained.
- the jet oxidation treatment and the dry oxidation treatment are performed by heating the oxygen gas and the hydrogen chloride gas in the combustor 12. It is possible You. However, since the heated oxygen gas cools when passing through the combustion chamber 59 at the latter stage of the combustor 12, the activity of the oxygen gas when supplied to the heat treatment furnace 2 is low. As a result, it is difficult to perform processing with good in-plane uniformity of the film thickness.
- the oxygen gas heated by the heater 13 can be supplied to the heat treatment furnace 2 while maintaining the activity of the oxygen gas. For this reason, as described above, high in-plane uniformity of the film thickness can be ensured.
- various processes can be favorably performed by one heat treatment apparatus. For this reason, the process can be selected in a wider range, which is advantageous in terms of cost and space efficiency. Further, since the above-mentioned processing can be performed by one heat treatment apparatus, a plurality of processings are continuously performed in the following manner while the wafer is stored in the reaction tube 21. You can do it.
- the gettering process is first performed while the wafer W is stored in the reaction tube 21, and then the jet oxidation process is continuously performed. In this case, the metal on the wafer surface is removed by the gettering process, and the wet oxide film is formed in this state, so that a high-quality film can be formed.
- both processes can be performed alternately and continuously.
- wet oxidation is performed, and then the inside of the reaction tube 21 is compared.
- a dry oxidation treatment is performed after purging with nitrogen gas, and further, the inside of the reaction tube 21 is purged with, for example, nitrogen gas, and a jet oxidation treatment is performed again.
- a jet oxidation treatment is performed again.
- a wet oxidation treatment and an oxynitridation treatment, or a wet oxidation treatment, a dry oxidation treatment and an oxynitridation treatment can be performed successively.
- the wafer W is stored in the reaction tube 21 first, and then the wet oxidation process is performed, then the reaction tube 21 is purged with, for example, nitrogen gas, and then the dry oxidation process is performed. Further, the inside of the reaction tube 21 is purged with, for example, a nitrogen gas, and finally an oxynitriding process is performed.
- the second gas supply pipe 42 can be configured as a double pipe at a portion downstream of the heating chamber 51.
- the outer pipe is interposed between the inner pipe through which the gas passes and the outside air, and the inner pipe does not contact the outside air.
- the processing gas can be introduced into the first gas supply pipe 41 while maintaining the pressure.
- An orifice (a portion where the pipe diameter is sharply reduced) may be formed in the second supply pipe 42 between the heater 13 and the reaction pipe 21. Since a pressure loss occurs in the orifice, the degree of pressure reduction in the heating chamber 61 is reduced even when a decompression process is performed in the processing chamber. In this case, the degree to which convection in the heating chamber 61 is impeded in the depressurization process is small, and the partial pressure of the processing gas in the heating chamber 61 also increases. Therefore, heat conduction due to convection of the processing gas in the heating chamber 61 is more likely to occur than in the case where the orifice is not provided, and the processing gas can be sufficiently heated to a predetermined temperature. .
- the experiment was performed under the processing conditions described in the section (Dry Oxidation Treatment) in the above embodiment.
- the processing gas is heated by the heater 13 (the heater 63 of the heater 13 is turned on)
- the dry oxidation treatment is performed. I went.
- a silicon oxide film having a thickness of 10 nm was formed with a processing time of 90 minutes.
- dry oxidation was performed under the same processing conditions except that the processing gas was not heated (the heater 63 of the heater 13 was turned off).
- FIGS. 7A and 7B are characteristic diagrams respectively showing the inter-plane uniformity and the in-plane uniformity which are the experimental results when the dry oxidation treatment is performed using the heat treatment apparatus shown in FIG.
- the horizontal axis is the surface of the film thickness. The average value of the inter-uniformity is shown, and the vertical axis indicates whether or not the heater 13 is heated.
- the horizontal axis represents the average value of the in-plane uniformity of the film thickness.
- the vertical axis represents the position of the wafer W on the wafer boat 3.
- the hatched columns show the case where the calorific heat of the processing gas is applied, and the columns without hatching show the case where the processing gas is not heated.
- the experiment was performed under the processing conditions described in the section (Oxynitriding) of the above embodiment.
- an oxynitriding treatment was performed while heating the processing gas with the heater 13 (with the heater 63 of the heater 13 turned on).
- the process temperature in the reaction tube 21 was 800 ° C.
- the process pressure was 93.lkPa
- the temperature of the heater 13 was 100 ° C.
- dinitrogen monoxide gas was used.
- the flow rate was 5 s 1 m.
- the processing time At 7.5 minutes, a nitrogen-containing silicon oxynitride film having a thickness of 2.5 nm was formed.
- oxynitriding was performed under the same processing conditions except that the processing gas was not heated (the heater 63 of the heater 13 was turned off).
- FIGS. 8A and 8B are characteristic diagrams showing experimental results when the oxynitriding treatment was performed using the heat treatment apparatus shown in FIG. 1 and turning the heaters on and off, respectively.
- the horizontal axis represents the film depth
- the vertical axis represents the nitrogen concentration in the film.
- FIG. 9 is a characteristic diagram showing an experimental result in the case of performing a diluted wet oxidation treatment using the heat treatment apparatus shown in FIG. Figure 9 Smell
- the horizontal axis indicates the position of the wafer W on the wafer port 3, and the vertical axis indicates the in-plane uniformity.
- “ ⁇ ” indicates the case where heating of nitrogen gas is performed
- “X” indicates the case where heating of nitrogen gas is not performed.
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Description
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KR1020037013400A KR100814594B1 (ko) | 2001-05-09 | 2002-03-13 | 반도체 처리용 열처리 장치 및 방법 |
US10/477,110 US6903030B2 (en) | 2001-05-09 | 2002-03-13 | System and method for heat treating semiconductor |
EP02705102A EP1388891B1 (en) | 2001-05-09 | 2002-03-13 | System for heat treating semiconductor |
TW091121351A TW561557B (en) | 2001-05-09 | 2002-09-18 | Heat-processing apparatus and method for semiconductor process |
SG200206741A SG98498A1 (en) | 2001-05-09 | 2002-11-07 | Heat-treating apparatus and method for semiconductor process |
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JP2001138831A JP3421660B2 (ja) | 2001-05-09 | 2001-05-09 | 熱処理装置及びその方法 |
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EP (1) | EP1388891B1 (ja) |
JP (1) | JP3421660B2 (ja) |
KR (1) | KR100814594B1 (ja) |
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CN100402696C (zh) * | 2003-02-07 | 2008-07-16 | 东京毅力科创株式会社 | 处理被处理基板的半导体处理方法和装置 |
US7709394B2 (en) | 2006-03-27 | 2010-05-04 | Tokyo Electron Limited | Substrate processing method and apparatus fabrication process of a semiconductor device |
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TW578214B (en) * | 2000-05-29 | 2004-03-01 | Tokyo Electron Ltd | Method of forming oxynitride film or the like and system for carrying out the same |
CN1613142A (zh) * | 2002-01-09 | 2005-05-04 | 株式会社瑞萨科技 | 半导体集成电路器件的制造方法 |
KR100517405B1 (ko) * | 2003-06-27 | 2005-09-27 | 삼성전자주식회사 | 질량 유량 제어기 및 이를 갖는 가스 공급 장치 |
CN1265246C (zh) * | 2003-07-11 | 2006-07-19 | 友达光电股份有限公司 | 一种光刻胶涂敷装置 |
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Also Published As
Publication number | Publication date |
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SG98498A1 (en) | 2003-09-19 |
CN1294630C (zh) | 2007-01-10 |
US6903030B2 (en) | 2005-06-07 |
JP3421660B2 (ja) | 2003-06-30 |
JP2002334867A (ja) | 2002-11-22 |
CN1605116A (zh) | 2005-04-06 |
US20040168638A1 (en) | 2004-09-02 |
TW561557B (en) | 2003-11-11 |
KR20030093312A (ko) | 2003-12-06 |
EP1388891A1 (en) | 2004-02-11 |
EP1388891B1 (en) | 2011-10-05 |
EP1388891A4 (en) | 2009-07-01 |
KR100814594B1 (ko) | 2008-03-17 |
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