WO2004086485A1 - 半導体装置における絶縁膜の形成方法 - Google Patents
半導体装置における絶縁膜の形成方法 Download PDFInfo
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- WO2004086485A1 WO2004086485A1 PCT/JP2004/003638 JP2004003638W WO2004086485A1 WO 2004086485 A1 WO2004086485 A1 WO 2004086485A1 JP 2004003638 W JP2004003638 W JP 2004003638W WO 2004086485 A1 WO2004086485 A1 WO 2004086485A1
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- Prior art keywords
- film
- insulating film
- forming
- gas
- thickness
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000004065 semiconductor Substances 0.000 title claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 57
- 239000007789 gas Substances 0.000 claims description 60
- 230000001590 oxidative effect Effects 0.000 claims description 15
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 9
- 229910001882 dioxygen Inorganic materials 0.000 claims description 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 7
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000001272 nitrous oxide Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 description 31
- 239000000758 substrate Substances 0.000 description 25
- 230000015572 biosynthetic process Effects 0.000 description 17
- 238000003795 desorption Methods 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 13
- 238000000137 annealing Methods 0.000 description 11
- 239000011229 interlayer Substances 0.000 description 10
- 239000010410 layer Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 238000011282 treatment Methods 0.000 description 8
- 238000000231 atomic layer deposition Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- 238000000151 deposition Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 239000007858 starting material Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 238000004868 gas analysis Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- ZYLGGWPMIDHSEZ-UHFFFAOYSA-N dimethylazanide;hafnium(4+) Chemical compound [Hf+4].C[N-]C.C[N-]C.C[N-]C.C[N-]C ZYLGGWPMIDHSEZ-UHFFFAOYSA-N 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 2
- -1 GaAs compound Chemical class 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 238000000560 X-ray reflectometry Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000004091 panning Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005089 soft X-ray photoelectron spectroscopy Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000010938 white gold Substances 0.000 description 1
- 229910000832 white gold Inorganic materials 0.000 description 1
Classifications
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- H01L21/02107—Forming insulating materials on a substrate
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- H01L21/02271—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition
- H01L21/0228—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by decomposition or reaction of gaseous or vapour phase compounds, i.e. chemical vapour deposition deposition by cyclic CVD, e.g. ALD, ALE, pulsed CVD
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
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- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
- C23C16/45531—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations specially adapted for making ternary or higher compositions
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
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- 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
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- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
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- H01L29/51—Insulating materials associated therewith
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- H01L21/02107—Forming insulating materials on a substrate
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- H01L21/0214—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC the material being a silicon oxynitride, e.g. SiON or SiON:H
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- 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
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- H01L21/28194—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation by deposition, e.g. evaporation, ALD, CVD, sputtering, laser deposition
Definitions
- the present invention relates to a method for forming an insulating film in a semiconductor device, and more particularly, to a gate insulating film or a MIM (Metal Insulator Metal) type in an Ml 5 (Metal Insulator or Semiconductor) transistor.
- the present invention relates to a method for forming a capacitor insulating film in a capacitor.
- the H i gh - as k film for example, A 1 2 0 3 and H f 0 2, etc. are known, as a technique for forming such an H Igh- k film, ALD (At omi c L ay er Deposition (atomic layer deposition) method.
- ALD At omi c L ay er Deposition (atomic layer deposition) method.
- the ALD method as raw materials, for example, trimethyl aluminum (TMA: A 1 (CH 3 ) 3) and with water vapor (H 2 0), by Rukoto blown to S i board these materials alternately, Al This is to perform 2-3 film formation.
- the CH 3 group (methyl group) constituting the raw material is taken into the film and acts as an impurity (C x H y ), thereby deteriorating the film quality.
- a method for removing this impurity for example, in a gate insulating film of an MIS transistor, generally, as shown on the right side of FIG.
- the heat treatment is performed after forming the k film 52.
- the heat treatment after the film formation is not sufficient, and as shown in FIG. 10A, only the impurities 53 near the surface of the formed High-k film 52 are removed. I can't. Therefore, when performing impurity treatment by heat treatment to a deep portion near the interface between the Si substrate 51 and the high-k film 52, as shown in FIG.
- the heat treatment temperature is increased. Although or it is necessary to perform the heat treatment for a long time, if you do so, as shown in the right side of the FIG. 10 (B), the interface layer 5 4, such as S I_ ⁇ 2 is formed in the interface would.
- the above-mentioned problem occurs not only when forming the gate insulating film of the MIS transistor but also when forming the insulating film for the capacitor of the MIM type capacitor.
- an object of the present invention is to prevent impurities that deteriorate the film quality from being present in an insulating film in a semiconductor device as much as possible.
- An object of the present invention is to provide a method for forming an insulating film in a semiconductor device (hereinafter, simply referred to as a method for forming an insulating film). Disclosure of the invention
- a method for forming an insulating film according to the present invention includes a plurality of steps of forming an insulating film having a thickness in a range of 0.3 to 2 nm and removing impurities in the insulating film. By repeating the process a number of times, an insulating film having a predetermined thickness is obtained (claim 1).
- the insulating film is formed to have a thickness in a range of 0.3 to 2 nm.
- the step of forming a film and the step of removing impurities in the insulating film are repeated a plurality of times to form an insulating film having a predetermined thickness, so that impurities can be reduced as much as possible while preventing inconvenience due to the growth of the interface layer.
- a small high-k film can be easily and reliably formed.
- the step of removing the impurities may be performed in a reducing gas atmosphere or an oxidizing gas atmosphere (Claim 2). It may be performed by a combination of the following (claim 3). Under any of the gas atmospheres, a desired H i g h -k film can be easily and reliably formed.
- the reducing atmosphere in the step of removing the impurities may be any one of an ammonia gas, a hydrogen gas, or an inert gas, a mixed gas of these gases, plasma nitrogen, or a vacuum. (Claim 4).
- the oxidizing gas atmosphere in the step of removing the impurities may be any one of oxygen gas, nitric oxide, nitrous oxide and ozone gas, a mixed gas of these gases, or plasma oxygen. (Claim 5).
- FIG. 1 shows an MIS transistor to which the method of forming an insulating film according to the present invention is applied. It is a figure which shows the structure of the evening schematically.
- Figure 2 is a diagram of order to explain the results obtained when thermal desorption analysis of A 1 2 0 3 film.
- Figure 3 is a diagram for explaining the results when thermal desorption analysis of H f 0 2 film.
- FIG. 4 is a diagram for explaining the results obtained when the HfA1Ox film was subjected to thermal desorption gas analysis.
- FIG. 5 is a diagram for explaining the results measured with H f 0 2 film in the soft X-ray photoelectron spectroscopy.
- FIG. 6 is a diagram for explaining an example of a method for manufacturing a semiconductor device according to the present invention.
- FIG. 7 is a diagram showing the characteristics of a High-k film formed by the method of manufacturing a semiconductor device, together with a comparative example.
- FIG. 8 is a view for explaining another example of the method of manufacturing a semiconductor device according to the present invention.
- FIG. 9 is a diagram schematically showing a structure of a MIM type capacitor to which the method of forming an insulating film according to the present invention is applied.
- FIG. 10 is a diagram for explaining the prior art and its disadvantages. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 schematically shows a configuration of an MIS transistor 1 as a semiconductor device to which the method for forming an insulating film according to the present invention is applied.
- a Si substrate which is simply referred to as a Si substrate
- Reference numeral 3 denotes an element isolation oxide film for isolating elements from each other, and is formed by thermally oxidizing the Si substrate 2.
- 4 is on the surface 2 a of the Si substrate 2 The method for forming the gate insulating film to be formed will be described later in detail.
- Reference numeral 5 denotes a gate electrode formed on the upper surface of the gate insulating film 4, for example, a polycrystalline Si film or a polycrystalline SiGe film, or a noble metal such as Pt (white gold) that does not react with the gate insulating film 4 or T. It is made of a high melting point metal such as iN or TaN.
- Reference numeral 6 denotes a channel region, in which P (phosphorus) or the like is injected into the n-channel and B (boron) is injected into the p-channel, and heat-treated at a temperature of 800 to 1000 ° C for 10 to 30 minutes. Activate.
- Reference numeral 7 denotes an interlayer insulating film made of, for example, Si 2 and formed by a CVD (Chemical Vapor or Deposition) method or the like.
- Reference numeral 8 denotes a lead electrode of the channel region 6, which is composed of, for example, A1, and serves as a source-drain electrode.
- the panning is performed by, for example, a photolithography technique.
- the gate insulating film 4 is made of a high-k film having a desired thickness. As shown in FIG. 6, a film forming step 11 and an impurity removing step (annealing step) 12 are sequentially repeated a plurality of times. The feature is that it is performed. That is, instead of forming the high-k film 4 having a desired thickness all at once on the Si substrate 2, a film having a predetermined thickness is formed little by little, and then, under a predetermined gas atmosphere. The feature is that annealing is performed to minimize residual impurities. Therefore, before describing a specific example of the method of forming the gate insulating film 4, the experiments performed by the inventors and consideration of the results thereof should be referred to FIGS. 2 to 5. It will be explained.
- the thermal desorption gas analysis is a method of analyzing the desorbed gas at that time while increasing the temperature, it is the same as performing the heat treatment, and it was found from this analysis result that However, the film thickness from which impurities can be removed by heat treatment is finite and is about 1.5 nm or less. If the film thickness is more than that, impurities may remain.
- the film formation by ALD for example, appropriate thickness (e.g., 500 m extent) the Hf 0 2 film 0. 7 ⁇ 7. 5 nm in thickness S i on a substrate made of S i single crystal plate of did.
- the film formation conditions are as follows: a substrate temperature of 250 ° C., a starting material, TDMAH CH f (N (CH 3 ) 2 ): tetrakisdimethylamino hafnium] as a starting material, and steam as an oxidizing agent. Gases were used respectively.
- the Hf 0 2 film was Atsushi Nobori spectroscopy in the TDS.
- Figure 3 shows the results. From the relationship between the film thickness shown in FIG.
- the ALD method appropriate thickness (e.g., about 500 um) was formed on the Hf A 1_Rei x membrane 0. 7 ⁇ 1 1 nm of thickness S i on a substrate made of S i single crystal plate of .
- the film forming conditions were as follows: a substrate temperature of 250 ° C .; TMA as an A1 raw material, TDMAH as a Hf raw material, and steam gas as an oxidizing agent as starting raw materials.
- the HfA10 film was subjected to thermal desorption gas analysis by TDS.
- Figure 4 shows the results. In FIG. 4, (A) shows the TDS spectrum of molecular weight 28 (C 2 H 4 ) when the film thickness is variously changed, and (B) shows the film thickness and the C 2 H 4 gas. It shows the relationship with the desorption amount.
- the film thickness from which impurities can be removed changes depending on the type of element constituting the film, and the film thickness is 0.3 to 2. If it is in the Onm range (optimally, in the range of 0.5 to 1.8 nm), it is derived that impurities can be reliably removed by heat treatment. Note that 0.3 nm is the minimum film thickness that can be formed as a film, and corresponds to one monolayer (monolayer).
- This impurity removing step anneals the high-k film at a predetermined temperature under a certain gas atmosphere.
- the atmosphere gas includes a reducing gas atmosphere or an oxidizing gas atmosphere.
- the impurity removal step performed after the step It is performed in an appropriate combination.
- Figure 5 shows the data measured by XPS (Xray photoelectron on spectroscopy) after the impurity removal step (Agnille step).
- A shows the first measurement.
- (B) shows the case where the first annealing was performed in an oxidizing gas atmosphere. From FIG.
- FIGS. 6 and 7 are views for explaining the first embodiment of the present invention.
- the thickness of the high-k film as the gate insulating film 4 is 4.O nm. It is.
- a Si substrate 2 made of a single Si plate having an appropriate thickness (for example, about 500 m) is prepared, and a 0.5 nm thick high-k film is formed on this surface by ALD.
- a Hf A1 Ox film is formed as a first film (first film formation, see reference numeral 11 in FIG. 6).
- the film formation conditions at this time are a substrate temperature of 250 ° C., and as the starting materials, TMA is used as the A1 material, TDMAH is used as the Hf material, and steam gas is used as the oxidizing agent.
- the HfA1Ox film is subjected to an impurity treatment by performing a heat treatment at 650 for 30 seconds in an NH 3 (ammonia) gas atmosphere as a reducing gas (first heat treatment, FIG. (Refer to reference numerals 1 and 2).
- This first heat treatment is preferably performed in a reducing gas atmosphere. Because, in the case of performing the heat treatment under an oxidizing gas atmosphere, because of 0. 5 nm and a thin thickness, S i of the interface is oxidized to form S i 0 2, low dielectric constant interfacial layer is formed This is because that.
- the heat treatment is performed at 650 ° C. From the results of FIG. 2 (A) and FIG.
- the ambient temperature during this heat treatment is set to about 500 ° C. or higher. Therefore, the treatment temperature for impurity removal is preferably 500 ° C. or more.
- the Hf A10 film is formed to the same thickness under the same film formation conditions as the first film formation (2 The second deposition, see reference numeral 11 in FIG. 6).
- the impurity treatment is performed in the oxygen gas (for example, under a pressure of 130 Pa) at the same temperature and for the same time as the first heat treatment (the second heat treatment). , See reference numerals 12 in FIG. 6). Thereafter, the film formation and the heat treatment are alternately repeated until the seventh time. In this case, the heat treatment is performed in the same manner as the second heat treatment.
- the eighth film formation is performed in the same manner as the above-described film formation up to the seventh time, and then, the heat treatment is performed in an oxygen gas atmosphere (oxidizing gas atmosphere) at the same temperature and the same time as the heat treatment up to the seventh time. I do.
- Fig. 7 shows Hf A10, a film (4.0 nm in film thickness) created by alternately repeating the above-mentioned film formation and heat treatment a plurality of times. forming a hf a 1 O x film, 1 of the last H f a 1 and heat treated 3 0 seconds 6 5 0 ° C for impurity sense to O x film B and first thickness 4.01 111 "1
- the figure shows the results of a thermal desorption gas analysis of a HfA1Ox film C, which was formed by depositing a 1 Ox film and finally heat-treated at 850 ° C for 30 seconds for impurity treatment. .
- the desorption gas (CH 4 gas) is scarcely recognized in the HfA 1 CU film A according to the method of the present invention in which film formation and heat treatment (impurity removal treatment) are alternately performed.
- FIG. 7 shows the desorption of CH 4 gas having a molecular weight of 16; however, other molecular weights, for example, C 4 having a molecular weight of 28 Even in C 2 H 6 in 2 H 4 or molecular weight 30, further, also in C ⁇ 2 of molecular weight 44, similar results to those in the FIG. 7 is obtained.
- interfacial layer is Tei ⁇ conductivity layer on the interface between the S i is also confirmed that not formed at all.
- Hf A10, SI (High-k film) according to the method of the present invention hardly contains impurities, and there is no low dielectric constant layer at the interface with Si. Then, in the method of the present invention, since impurities can be removed at a relatively low temperature of 650 ° C., crystallization of the High_k film is suitably suppressed, and the High-k film is crystallized. When crystallized, the crystal grain boundary does not become a weak point, and the reliability of the high-k film at an angle is not reduced.
- FIG. 8 shows a second embodiment of the present invention, in which a HfA10 film is formed with a thickness of 3 nm on a Si substrate using the same starting materials as in the first embodiment. Is what you do.
- Sample A, Sample B and Sample C are heat-treated under a predetermined gas atmosphere after a 1-nm film is formed. It is a membrane.
- a sample D according to a conventional method of forming a 3-nm high-k film at a stroke was used.
- annealing was performed at 65 Ot in an oxygen gas atmosphere at 20 as a heat treatment (PDA) after film formation.
- PDA heat treatment
- samples A to C show the high-k films according to the method of the present invention.
- samples A and B performed the first annealing (heat treatment) in an ammonia gas atmosphere.
- the first annealing (heat treatment) was performed in an oxygen gas atmosphere.
- the second and third annealings (heat treatments) were performed in an ammonia gas atmosphere, while the latter was performed in an oxygen gas atmosphere.
- Sun Pull C is annealed (heat treated) in an oxygen gas atmosphere.
- the physical properties of Samples A to D were evaluated. That is, the amount of carbon as a residual impurity in the film was analyzed by SIMS (Secondary Ionization on Mass Spectrometer). In addition, X-ray reflectivity was measured for the film density to determine the film density. The results of the analysis and measurement are shown in Table i below.
- samples A to (: according to the method of the present invention have better electrical characteristics than the sample D according to the conventional method. That is, the hysteresis of the CV curve is small. However, samples A to C are significantly smaller than sample D. Also, samples A to C have significantly lower leakage currents than sample D. As can be seen from Table 1, Samples A to (: have very few impurities compared to Sample D, and have high density and high density. From this, it can be seen that the High-k film according to the method of the present invention has extremely excellent properties as compared with the High-k film according to the conventional method.
- a reducing gas atmosphere or an oxidizing gas atmosphere is employed as a gas atmosphere in the step of removing impurities (heat treatment or annealing step).
- a near gas was used and an oxygen gas was used in an oxidizing gas atmosphere
- the present invention is not limited to this, and various gases can be used. That is, the reducing atmosphere in the step of removing impurities may be formed using hydrogen gas or an inert gas, or may be formed using a mixed gas of ammonia gas, hydrogen gas, or an inert gas.
- Plasma nitrogen may be used In addition, it may be in a vacuum.
- the oxidizing gas atmosphere in the step of removing impurities may be formed using nitric oxide (NO) gas, nitrous oxide (N 2 ⁇ ) gas, or ozone gas. It may be formed by using a mixed gas appropriately mixed.
- the method of the present invention is applied to a method of forming the gate insulating film 4 of the MIS transistor 1. This is a method of forming a gate insulating film 4 made of a High_k film on a Si substrate 2, but the present invention is not limited to this, and the MIM type capacity is not limited to this. The same can be applied to the formation of the evening insulating film.
- FIG. 9 schematically shows the configuration of the MIM type capacitor 21.
- reference numeral 22 denotes an Si single crystal substrate (hereinafter, simply referred to as an Si substrate) whose resistivity is, for example, 0%. 0 1 to 15 ⁇ ⁇ cm.
- Reference numeral 13 denotes an element isolation oxide film for isolating elements from each other, and is formed by thermally oxidizing the Si substrate 2.
- Reference numeral 24 denotes a gate insulating film formed on the surface 22a of the Si substrate 22, which is formed in the same manner as the gate insulating film 4 shown in FIG.
- Reference numeral 45 denotes a gate electrode formed on the upper surface of the gate insulating film 4, for example, a polycrystalline Si film, a polycrystalline SiGe film, or a precious metal such as Pt (platinum) which does not react with the gate insulating film 4 or Ti. It is made of a high melting point metal such as N or TaN. 46 is a channel region. P (phosphorus) is injected into the n channel, B (boron) is injected into the p channel, and heat treatment is performed at a temperature of 800 to 1,000 ° C for 10 to 30 minutes to activate.
- To Reference numeral 27 denotes a first interlayer insulating film, for example, made of SiO 2 and formed by a CVD method or the like.
- Reference numeral 28 denotes a lead electrode of the channel region 46.
- Reference numeral 29 denotes a first interlayer insulating film formed on the upper surface of the first interlayer insulating film 17, which is made of, for example, SiO 2 and formed by a CVD method or the like.
- Reference numeral 30 denotes a lead electrode provided on the second interlayer insulating film 29 so as to be electrically connected to one of the lead electrodes 28 formed on the first interlayer insulating film 27. It is formed in the same manner as described above.
- Reference numeral 31 denotes a capacity provided in the second interlayer insulating film 29 so as to be electrically connected to the other side of the extraction electrode 28 formed in the first interlayer insulating film 27. It is configured as follows. That is, a contact hole is formed in the second interlayer insulating film 29, and a lower electrode 32, an upper electrode 33, and a capacitor formed between these two electrodes 32, 33 are formed in the contact hole. The insulating film 34 is provided, and the capacity 31 is formed by these.
- the lower electrode 32 is made of a noble metal such as Pt or a refractory metal such as TiN or TaN.
- the upper electrode 33 is made of a noble metal such as Cu, A1, or Pt.
- the electrodes 32 and 33 are made of a material that does not react with the capacitance insulating film 34, which is made of a high melting point metal such as TiN or TaN. Then, the capacitor insulating film 34 is formed by a High-k film on the upper surface of the lower electrode 32.
- the power jungling is performed, for example, by lithography technology.
- an SiO 2 film is formed with a thickness of 200 nm on an S ⁇ substrate, and a Pt film is formed with a thickness of about 10 O nm on this upper surface. It was formed to form a lower electrode for capacity.
- samples A to (: were formed on the upper surface of the lower electrode for the capacitor made of the Pt film by the method shown in FIG. 8, and as a comparative example, a 3-nm high-k film was formed at once. The conventional method was used as sample D.
- a TiN film was formed as an upper electrode, and the electrical characteristics of the insulating film for capacitance were evaluated. T the following Table 3 were obtained
- the Si substrate is used as the substrate on which the High-k film is formed.
- the substrate is a GaAs compound semiconductor.
- a substrate or an SOI (Silicon on Insulator) substrate may be used. Industrial applicability
- a gate insulating film made of a High-k film containing almost no impurities it is possible to form a gate insulating film made of a High-k film containing almost no impurities, and to reduce a flat band shift and an interface fixed charge caused by impurities. As a result, a high-quality MIS transistor can be obtained.
- an insulating film for a capacitor made of a high-k film containing almost no impurities is formed. As a result, it is possible to prevent a decrease in breakdown voltage due to impurities, and as a result, it is possible to obtain a high-quality MIM type capacitor.
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Abstract
Description
Claims
Priority Applications (3)
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US10/550,805 US20070077776A1 (en) | 2003-03-24 | 2004-03-18 | Method for forming an insulating film in a semiconductor device |
EP04721668A EP1608007B8 (en) | 2003-03-24 | 2004-03-18 | Method for forming insulating film in semiconductor device |
KR1020057017077A KR100751659B1 (ko) | 2003-03-24 | 2004-03-18 | 반도체 장치에서의 절연막의 형성 방법 |
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JP2003079279A JP4140767B2 (ja) | 2003-03-24 | 2003-03-24 | 半導体装置における絶縁膜の形成方法 |
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EP (1) | EP1608007B8 (ja) |
JP (1) | JP4140767B2 (ja) |
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US20050170665A1 (en) * | 2003-04-17 | 2005-08-04 | Fujitsu Limited | Method of forming a high dielectric film |
KR100762896B1 (ko) * | 2006-05-30 | 2007-10-08 | 주식회사 하이닉스반도체 | 반도체 소자의 박막 증착방법 |
JP2010278319A (ja) * | 2009-05-29 | 2010-12-09 | Renesas Electronics Corp | 半導体装置およびその製造方法 |
JP2012104569A (ja) * | 2010-11-08 | 2012-05-31 | Hitachi Kokusai Electric Inc | 半導体装置の製造方法及び基板処理装置 |
JP6540571B2 (ja) | 2016-03-24 | 2019-07-10 | 豊田合成株式会社 | 半導体装置の製造方法及び半導体装置 |
WO2019028120A1 (en) * | 2017-08-01 | 2019-02-07 | Applied Materials, Inc. | METHODS OF POST-PROCESSING METAL OXIDE |
KR102563298B1 (ko) * | 2021-01-18 | 2023-08-03 | 주식회사 유진테크 | 박막의 불순물 제거방법 및 기판 처리 장치 |
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- 2004-03-18 EP EP04721668A patent/EP1608007B8/en not_active Expired - Lifetime
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EP1608007A1 (en) | 2005-12-21 |
EP1608007B8 (en) | 2012-09-26 |
KR20050115910A (ko) | 2005-12-08 |
TW200423238A (en) | 2004-11-01 |
US20070077776A1 (en) | 2007-04-05 |
JP2004288884A (ja) | 2004-10-14 |
KR100751659B1 (ko) | 2007-08-23 |
EP1608007B1 (en) | 2012-08-15 |
TWI348184B (en) | 2011-09-01 |
JP4140767B2 (ja) | 2008-08-27 |
EP1608007A4 (en) | 2010-03-17 |
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