WO2003098678A1 - Procede de traitement de substrat - Google Patents
Procede de traitement de substrat Download PDFInfo
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- WO2003098678A1 WO2003098678A1 PCT/JP2003/006080 JP0306080W WO03098678A1 WO 2003098678 A1 WO2003098678 A1 WO 2003098678A1 JP 0306080 W JP0306080 W JP 0306080W WO 03098678 A1 WO03098678 A1 WO 03098678A1
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- Prior art keywords
- nitrogen
- oxide film
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- 239000000758 substrate Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 25
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 125000004433 nitrogen atom Chemical group N* 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 239000010703 silicon Substances 0.000 claims abstract description 22
- 150000002831 nitrogen free-radicals Chemical class 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims description 37
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 239000007789 gas Substances 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- -1 nitrogen ions Chemical class 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims 3
- 238000005530 etching Methods 0.000 claims 1
- 238000005121 nitriding Methods 0.000 description 20
- 238000009826 distribution Methods 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 7
- 229910052814 silicon oxide Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 150000003254 radicals Chemical class 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 125000004430 oxygen atom Chemical group O* 0.000 description 3
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- LMRJHNFECNKDKH-UHFFFAOYSA-N 4-(trifluoromethyl)nicotinic acid Chemical compound OC(=O)C1=CN=CC=C1C(F)(F)F LMRJHNFECNKDKH-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 201000009032 substance abuse Diseases 0.000 description 1
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32917—Plasma diagnostics
- H01J37/32935—Monitoring and controlling tubes by information coming from the object and/or discharge
-
- 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
- H01L21/02252—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by plasma treatment, e.g. plasma oxidation of the substrate
-
- 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
- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
- H01L21/02321—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer
- H01L21/02329—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer introduction of nitrogen
- H01L21/02332—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment introduction of substances into an already existing insulating layer introduction of nitrogen into an oxide layer, e.g. changing SiO to SiON
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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
- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
- H01L21/02337—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour
- H01L21/0234—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment by exposure to a gas or vapour treatment by exposure to a plasma
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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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/3143—Inorganic layers composed of alternated layers or of mixtures of nitrides and oxides or of oxinitrides, e.g. formation of oxinitride by oxidation of nitride layers
- H01L21/3144—Inorganic layers composed of alternated layers or of mixtures of nitrides and oxides or of oxinitrides, e.g. formation of oxinitride by oxidation of nitride layers on 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
- H01L21/02247—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 nitridation, e.g. nitridation of the substrate
Definitions
- the present invention generally relates to a method for treating a substrate, and more particularly to a method for treating an oxide film formed on a silicon substrate surface.
- the thickness of a gate insulating film In order to increase the operating speed of a semiconductor device in accordance with the gut length, it is necessary to reduce the thickness of a gate insulating film according to a scaling rule. For example, when a conventional thermal oxide film is used as the gate insulating film, the thickness of the gate insulating film needs to be reduced to 1.7 nm or less. However, when the thickness of the oxide film is reduced in this way, the gate leak current flowing through the oxide film due to the tunnel effect increases.
- silicon nitride is a material that has been used in conventional semiconductor processes and has a dielectric constant twice that of silicon oxide, making it a promising gate insulating film for next-generation high-speed semiconductor devices. Material. Background art
- a silicon nitride film has generally been formed on an interlayer insulating film by a plasma CVD method.
- a CVD nitride film generally has a large leak current and is not suitable as a gate insulating film. For this reason, no attempt has been made to use a nitride film as a gate insulating film.
- rare gas pumps such as Ar or Kr excited by microphone mouth wave 6080
- the oxynitride film formed in this way has a small oxidizing enzyme and has a leak current characteristic comparable to or exceeding that of a thermal oxide film, and is promising as a gate insulating film for next-generation high-speed semiconductor devices. It is believed that there is.
- the oxynitride film thus formed is chemically stable, and even if a high-dielectric film is formed on the oxynitride film, the metal element in the high-dielectric film generated through the oxynitride film is formed. Diffusion and the reaction between the high dielectric film and the silicon substrate due to the diffusion can be suppressed. Further, a technique of directly nitriding the surface of a silicon substrate by such a microwave plasma has been proposed.
- the introduced nitrogen atoms mainly consist of a silicon substrate and an oxide film. It is known that it concentrates in the vicinity of the interface.
- problems such as fluctuation of threshold voltage due to formation of an interface and poor mobility are caused. Will occur.
- the present invention generally aims to eliminate a new and useful substrate treatment which has solved the above-mentioned problems.
- a more specific object of the present invention is to provide a method for nitriding an oxide film that can optimize the distribution of nitrogen atoms in the film.
- the leakage current characteristic when nitriding an oxide film with nitrogen radicals excited by a microphone mouth-wave, by selecting a treatment Slffi according to the initial stage of the oxide film, the leakage current characteristic can be obtained.
- An oxynitride film having excellent characteristics can be obtained.
- FIG. 1 is a diagram showing a configuration of a microphone mouth wave plasma substrate processing apparatus used in the present invention
- FIGS. 2A to 2C are diagrams showing oxidation and silicon oxidation processing performed using the substrate processing apparatus of FIG. Diagram showing nitridation of acid ill;
- FIG. 3 shows the distribution of nitrogen atoms in the oxynitride film obtained in one embodiment of the present invention.
- FIG. 4 shows the time change of the distribution of nitrogen atoms in the oxynitride film of FIG. Is a diagram showing the relationship between the leakage current due to the nitridation of the oxide film and the oxide film converter in this embodiment;
- FIG. 6 is another diagram showing the relationship between the leakage current and nitrile oxide due to the nitridation of the oxide film in this example.
- the inventor of the present invention conducted an experiment of nitriding an oxide film with nitrogen radicals excited by Ar gas plasma in the research that is the basis of the present invention, and found that the distribution of nitrogen atoms in the film was »It was found that it greatly changed depending on the matter, especially processing and processing time.
- the present invention is based on the above findings and provides a method of nitriding an oxide film that can optimize the distribution of nitrogen atoms in the film.
- FIG. 1 shows a schematic configuration of a plasma substrate processing unit 10 used in the present invention.
- a plasma substrate processing apparatus 10 has a processing container 11 in which a substrate S is formed in a process space 11 A, and a processing container 11 in which a force S is formed. Is exhausted at the exhaust port 11B.
- An opening is formed on the processing vessel 11 in correspondence with the substrate W to be processed on the substrate holding table 12.
- the opening is formed by a top plate 13 made of a low-loss ceramic such as alumina. It is blocked. Further, a gas ring 14 having a gas introduction path and a number of nozzle openings communicating with the gas introduction path is formed below the top plate 13 so as to face the tiHB processing target W.
- the ttiia top plate 14 forms a microwave window, and a flat microwave antenna 15 such as a radial line slot antenna or a horn antenna is formed above the disgusting top plate 13.
- the processing space inside the tfllB processing vessel 11 is set to a predetermined processing by exhausting it through the ItllS exhaust port 11A, and inert gas such as Ar or Kr is supplied from the tfna gas ring l4. At the same time, an oxidizing gas / nitriding gas is introduced.
- a microphone mouth wave having a frequency of several GHz, for example, 2.45 GHz from the tiff antenna 15 high density can be obtained on the surface of the as-treated body in the knitting processing container 11.
- the plasma processing device in FIG. 1 has low plasma electrons, and damage to the processing target and the inner wall of the processing chamber 11 can be avoided.
- the formed radicals flow radially along the surface of the as3 ⁇ 4w to be treated and are quickly exhausted, so that the recombination of the radicals is suppressed, and efficient and very uniform substrate processing is performed. It becomes possible at low temperatures below ° c.
- FIG. 2A to 2C illustrate a substrate processing process according to an embodiment of the present invention using the substrate processing unit 10 of FIG.
- the silicon substrate 21 is introduced into the processing vessel 11 of the disgusting processing apparatus 10 as an abuse treatment S3 ⁇ 43 ⁇ 4W, and the Kr and oxygen of
- a silicon substrate having a thickness of 1.6 nra is formed on the surface of the silicon substrate 21.
- a film 22 is formed.
- the silicon oxide film 22 formed in this manner was formed at a high temperature of 700 ° C. or higher, although it was formed on a substrate ⁇ which was as low as about 400 ° C. It has leak current characteristics comparable to thermal oxide films.
- the silicon oxide film 22 may be a thermal oxide film.
- the mixed gas of Ar and nitrogen is supplied into the processing vessel 11 in the substrate processing apparatus 10 shown in FIG. 1, and 3 ⁇ 43 ⁇ 4 is set to 400 °.
- the plasma is excited by supplying microwaves at C.
- the internal pressure of the processing vessel 11 is set to 5 to 7 Pa, and the flow rate of Ar gas is, for example, 100 SCCM, and the flow rate of nitrogen gas is, for example, 40 SCCM. Supplied at As a result, the surface of the knitted silicon oxide film 22 is converted into a silicon oxynitride film 22A.
- FIG. 3 shows a SIMS profile showing the distribution of oxygen atoms and nitrogen atoms in the oxynitride film 22A thus nitrided.
- the interface between the oxynitride film 22A and the silicon fiber 21 is located at a depth of about 1.6 nm. It can be seen that the density is maximum at the center in the direction.
- the results in FIG. 3 indicate that in the oxynitride film 22A, the nitrogen atoms are distributed almost entirely except for the film surface and a portion immediately below the film surface. This means that a substantial amount of nitrogen atoms also exist near the interface between the S & t oxynitride film 22A and the silicon substrate 21.
- FIG. 3 shows that the process of FIG. 2C was carried out under the same conditions but with the treatment pressure changed to 60 to 130 Pa, but the nitrogen in the oxynitride film 22 A was not changed.
- the distribution power of atoms is further shown in S-Gei.
- the nitriding treatment shown in FIG. 2C is performed at a high level, and the number of nitrogen atoms incorporated into the oxynitride film 22A is lower than that of the it ⁇ And the nitrogen concentration in the film also decreases.
- the nitrogen concentration in the vicinity of the interface between the oxynitride film 22A and the silicon substrate 21 is lower than the detection limit and hardly occurs.
- FIG. 4 is a diagram showing a temporal change in distribution of nitrogen atoms in the film.
- the nitridation treatment at a treatment as high as 6 OPa is very thin.
- it is suitable to introduce nitrogen only into a part of the oxynitride film with a film thickness of 1 nm or less, while the fineness is low. Therefore, it can be seen that the nitriding treatment at a low refining process Sffi of 60 Pa or less is suitable for uniformly nitriding an oxynitride film having a relatively thick thickness, for example, JHi exceeding 1 nm.
- Figs. 3 and 4 show that when the treatment temperature is increased during the nitridation treatment in Fig. 2C, the electron temperature decreases, so that the nitrogen ions formed in the plasma are not easily accelerated toward the substrate and reach the substrate.
- the processing pressure is set low, the electron temperature rises and the nitrogen ions are accelerated in the direction of the substrate, and the substrate is activated. This is considered to reflect the fact that nitridation is likely to occur because it is easy to reach.
- FIG. 5 shows the leakage characteristics of an n-type MOS capacitor using an oxynitride film formed by the method of the present invention as a gate insulating film.
- the method of forming the oxynitride film includes the case where the nitriding treatment shown in FIG. 2C is performed on the oxide film having a Hff of 1.6 nm in a high treatment pressure of 60 to 130 Pa for various times, and Two methods are used when the treatment is performed for various times at a low pressure of 7 Pa and at a processing pressure.
- the vertical axis indicates the gate leakage current density J g at the gate llffi-l .8 V, and the horizontal axis indicates the equivalent oxide thickness Tox.
- the dashed line shows the result at a high processing pressure
- the solid line shows the result at a low processing pressure
- the nitridation treatment of FIG. 2C was performed with a low efficiency: ⁇ , the oxide film enrichment T X was almost 1.4 ⁇ in due to the penetration of nitrogen atoms into the oxide film.
- the force S that suppresses the increase in leakage current and the nitriding treatment are lengthened, a turnaround phenomenon occurs at the point indicated by X in the figure, the leakage current starts to decrease, and the oxide equivalent, ToX, starts increasing. .
- ⁇ has a small amount of nitrogen atoms incorporated into the film, so the oxide film equivalent SD ⁇ as shown by ⁇ in Fig. 5 Although the decrease is small, the increase in leakage current due to the decrease in oxide film) is further suppressed. In other words, the slope of the curve indicated by the stone sickle in FIG. 5 is steeper than the slope of the curve indicated by the solid line.
- the allowable leak current value is 1 A / cm 2 at the time of applying 1.1.8, the oxide film in the state of FIG.
- the film thickness is, for example, 1.45 nm or less, it can be seen that when nitrogen atoms are introduced by nitriding at 5 to 7 Pa, the leak current value exceeds the allowable range of the key.
- the initial thickness of the oxide film 12 indicated by the arrow B is about 1.6 nm
- the leakage current density immediately before the turnaround point is as low as 5 to 7 Pa for the t & f self-nitriding process. After that, it is almost equal to the permissible limit value, and becomes a rail value. Therefore, the initial Hff of the oxide film 12 is not more than about 1.6 II m: ⁇ indicates that the leakage current is less than the tin tolerance when the leakage nitriding is performed at a low pressure of 5 to 7 Pa. It is concluded that it is preferable to perform the ttriB nitridation at a high processing pressure of 60 to 130 Pa instead of such a low processing pressure.
- the initial room was less than 1.6 nm because the rate of increase in leakage current due to the decrease in Nakan was small. Also, the requirement that the leak current value is 1 AZ cm 2 or less can be satisfied.
- the treatment should be lower than 3 Pa, preferably 5 to 7 Pa, in the nitriding step in FIG. 2C. It is preferable to set the range. .
- the leakage current value of the obtained oxynitride film is selected by selecting the treatment at the time of the nitriding treatment according to the initial I value of the oxide film. Within the desired tolerance.
- a treatment is selected according to the initial enzyme of the oxide film. Accordingly, an oxynitride film having excellent characteristics including leak current characteristics can be obtained.
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Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003231516A AU2003231516A1 (en) | 2002-05-16 | 2003-05-15 | Method of treating substrate |
JP2004506074A JP4256340B2 (ja) | 2002-05-16 | 2003-05-15 | 基板処理方法 |
US10/988,561 US7232772B2 (en) | 2002-05-16 | 2004-11-16 | Substrate processing method |
US11/616,217 US7429539B2 (en) | 2002-05-16 | 2006-12-26 | Nitriding method of gate oxide film |
US12/202,095 US20090035950A1 (en) | 2002-05-16 | 2008-08-29 | Nitriding method of gate oxide film |
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JP (2) | JP4256340B2 (ja) |
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TWI225668B (en) | 2002-05-13 | 2004-12-21 | Tokyo Electron Ltd | Substrate processing method |
WO2003098678A1 (fr) * | 2002-05-16 | 2003-11-27 | Tokyo Electron Limited | Procede de traitement de substrat |
TW200511430A (en) * | 2003-05-29 | 2005-03-16 | Tokyo Electron Ltd | Plasma processing apparatus and plasma processing method |
JP4408653B2 (ja) * | 2003-05-30 | 2010-02-03 | 東京エレクトロン株式会社 | 基板処理方法および半導体装置の製造方法 |
WO2005086215A1 (ja) | 2004-03-03 | 2005-09-15 | Tokyo Electron Limited | プラズマ処理方法及びコンピュータ記憶媒体 |
JP2006253311A (ja) * | 2005-03-09 | 2006-09-21 | Toshiba Corp | 半導体装置及びその製造方法 |
JP5595481B2 (ja) * | 2009-03-31 | 2014-09-24 | アプライド マテリアルズ インコーポレイテッド | 選択的窒素化の方法 |
US8481433B2 (en) * | 2009-03-31 | 2013-07-09 | Applied Materials, Inc. | Methods and apparatus for forming nitrogen-containing layers |
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US20130341692A1 (en) * | 2012-06-22 | 2013-12-26 | Taiwan Semiconductor Manufacturing Company, Ltd. | Novel [N] Profile in Si-Ox Interface for CMOS Image Sensor Performance Improvement |
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Also Published As
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US7429539B2 (en) | 2008-09-30 |
JPWO2003098678A1 (ja) | 2005-09-22 |
JP4256340B2 (ja) | 2009-04-22 |
TW200405582A (en) | 2004-04-01 |
US20090035950A1 (en) | 2009-02-05 |
US20050176223A1 (en) | 2005-08-11 |
TWI325184B (ja) | 2010-05-21 |
JP2008288620A (ja) | 2008-11-27 |
US7232772B2 (en) | 2007-06-19 |
US20070134895A1 (en) | 2007-06-14 |
JP4795407B2 (ja) | 2011-10-19 |
AU2003231516A1 (en) | 2003-12-02 |
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