WO2015049989A1 - 化学蒸着法によるSi基板上へのニッケル薄膜、及び、Si基板上へのNiシリサイド薄膜の製造方法 - Google Patents
化学蒸着法によるSi基板上へのニッケル薄膜、及び、Si基板上へのNiシリサイド薄膜の製造方法 Download PDFInfo
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- thin film
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 151
- 239000010409 thin film Substances 0.000 title claims abstract description 74
- 239000000758 substrate Substances 0.000 title claims abstract description 60
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000005229 chemical vapour deposition Methods 0.000 title claims abstract description 19
- 229910021332 silicide Inorganic materials 0.000 title claims description 6
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 title claims description 6
- 239000010408 film Substances 0.000 claims abstract description 94
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 41
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001257 hydrogen Substances 0.000 claims abstract description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 13
- 239000012495 reaction gas Substances 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 125000000058 cyclopentadienyl group Chemical group C1(=CC=CC1)* 0.000 claims abstract description 8
- 125000003342 alkenyl group Chemical group 0.000 claims abstract description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 6
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 6
- 150000001875 compounds Chemical class 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 19
- 229930195733 hydrocarbon Natural products 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 18
- 150000002430 hydrocarbons Chemical class 0.000 claims description 18
- 239000011261 inert gas Substances 0.000 claims description 2
- 125000001424 substituent group Chemical group 0.000 abstract description 6
- 239000002243 precursor Substances 0.000 description 16
- 239000012535 impurity Substances 0.000 description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 229910052786 argon Inorganic materials 0.000 description 5
- 238000000151 deposition Methods 0.000 description 5
- 230000008021 deposition Effects 0.000 description 5
- -1 nickel nitride Chemical class 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 238000000231 atomic layer deposition Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005240 physical vapour deposition Methods 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 229910005849 NiNx Inorganic materials 0.000 description 2
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 2
- 229910004219 SiNi Inorganic materials 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 150000004696 coordination complex Chemical class 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- ZSWFCLXCOIISFI-UHFFFAOYSA-N endo-cyclopentadiene Natural products C1C=CC=C1 ZSWFCLXCOIISFI-UHFFFAOYSA-N 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000000392 cycloalkenyl group Chemical group 0.000 description 1
- 125000001047 cyclobutenyl group Chemical group C1(=CCC1)* 0.000 description 1
- 125000001162 cycloheptenyl group Chemical group C1(=CCCCCC1)* 0.000 description 1
- 125000000596 cyclohexenyl group Chemical group C1(=CCCCC1)* 0.000 description 1
- 125000004090 cyclononenyl group Chemical group C1(=CCCCCCCC1)* 0.000 description 1
- 125000000522 cyclooctenyl group Chemical group C1(=CCCCCCC1)* 0.000 description 1
- 125000002433 cyclopentenyl group Chemical group C1(=CCCC1)* 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 150000002816 nickel compounds Chemical class 0.000 description 1
- RUFLMLWJRZAWLJ-UHFFFAOYSA-N nickel silicide Chemical compound [Ni]=[Si]=[Ni] RUFLMLWJRZAWLJ-UHFFFAOYSA-N 0.000 description 1
- 229910021334 nickel silicide Inorganic materials 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having 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
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
- H01L21/28518—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table the conductive layers comprising silicides
-
- 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
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0272—Deposition of sub-layers, e.g. to promote the adhesion of the main coating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/06—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material
- C23C16/18—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material from metallo-organic compounds
-
- 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
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/42—Silicides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/46—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for heating the substrate
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/56—After-treatment
-
- 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
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
- H01L21/283—Deposition of conductive or insulating materials for electrodes conducting electric current
- H01L21/285—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation
- H01L21/28506—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers
- H01L21/28512—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table
- H01L21/28556—Deposition of conductive or insulating materials for electrodes conducting electric current from a gas or vapour, e.g. condensation of conductive layers on semiconductor bodies comprising elements of Group IV of the Periodic Table by chemical means, e.g. CVD, LPCVD, PECVD, laser CVD
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/45—Ohmic electrodes
- H01L29/456—Ohmic electrodes on silicon
Definitions
- the present invention relates to a method for producing a high-quality nickel thin film directly on a Si substrate by chemical vapor deposition (chemical vapor deposition (CVD), atomic layer deposition (ALD)).
- CVD chemical vapor deposition
- ALD atomic layer deposition
- the present invention also relates to a method for manufacturing a Ni silicide thin film by siliciding the nickel thin film.
- NiSi nickel silicide films
- the NiSi film is formed by forming a Ni thin film on a Si substrate and heat-treating it to diffuse Si from the Si substrate to form a silicide to form NiSi.
- Patent Document 1 As a method for forming a Ni film on a Si substrate by chemical vapor deposition, for example, a method based on a method using nickel amidinate as a precursor (raw material compound) and NH 3 as a reaction gas is known.
- Patent Document 1 a method based on a method using nickel amidinate as a precursor (raw material compound) and NH 3 as a reaction gas is known.
- NiNx nickel nitride
- Patent Document 1 N is removed by heat treatment after film formation.
- Ni thin film formation and purification process can finally form a high-purity, low-resistance Ni thin film that does not contain an N component. Then, a NiSi film can be manufactured by forming a high-purity Ni thin film on the Si substrate.
- the density of the film is reduced and the form (roughness) is changed with the removal of N, and there is a concern that N may remain. Therefore, there is a problem that the Ni thin film has a high resistance to bulk Ni. A suitable electrode cannot be formed even if the Ni thin film is silicided.
- Ni thin film having no impurities remaining it is appropriate to exclude elements such as N that may remain in the Ni thin film as constituent elements of the precursor and the reaction gas. It can be said that it corresponds.
- a hydrocarbon-based Ni complex as a precursor and to apply hydrogen as a reaction gas. This is because if the hydrocarbon-based Ni complex is used, the complex component is released in the form of hydrocarbon, and there is little concern that impurities remain in the thin film.
- Ni thin film can be directly produced on Si using a hydrocarbon-based Ni complex.
- oxide film SiO 2
- a suitable Ni film can be formed.
- NiSi When forming a Ni film on a Si substrate having an oxide film, it cannot be converted into NiSi by silicidation. This is because silicidation proceeds by diffusion of Si into the Ni film, and if there is an oxide film between the Ni film and the Si substrate, this acts as a barrier and inhibits diffusion of Si into the Ni film. . Therefore, in order to form a NiSi thin film, the formation of a Ni thin film on a Si base is an essential matter.
- the present invention provides a method in which a Ni thin film can be directly formed on a Si substrate for forming a NiSi film, and no impurities remain in the formed Ni thin film.
- a method for producing a NiSi film by appropriately silicidating the formed Ni thin film will also be described.
- the present inventors examined conditions for directly forming a Ni film on a Si substrate while using a hydrocarbon-based Ni complex as a precursor.
- a range type of Ni complex in which a hydrocarbon-based Ni complex can be directly deposited on Si was sought and various deposition conditions were examined.
- impurities remain in the Ni thin film. That is, hydrocarbon-based Ni complexes are less likely to have impurities compared to nickel amidinate, but carbon (C) may be incorporated into the Ni film because of its constituent elements.
- the present invention is a method for producing a nickel thin film on a Si substrate by chemical vapor deposition, wherein as a raw material compound, nickel represented by the following formula, cyclopentadienyl group (Cp) or a derivative thereof, and A nickel complex in which a chain or cyclic alkenyl group consisting of 3 to 9 carbon atoms or a derivative thereof is coordinated, using a hydrocarbon-based nickel complex that does not contain elements other than carbon and hydrogen in the structure;
- hydrogen is used as a reaction gas
- the Ni thin film is manufactured under the following film forming conditions: a film forming pressure of 1 to 150 torr and a film forming temperature of 80 to 250 ° C.
- the basic process conforms to a normal chemical vapor deposition method.
- the thin film manufacturing process by chemical vapor deposition vaporizes a metal complex to be a precursor, transports it to the substrate surface together with a reaction gas, and deposits the metal from the metal complex on the substrate surface.
- the method for producing a Ni thin film according to the present invention also follows this step, but is characterized in that it is defined by the type of precursor to be applied and film formation conditions (film formation pressure and film formation temperature). In the following description, these characteristic portions will be described in detail.
- the precursor for producing the Ni thin film is a hydrocarbon-based Ni complex that does not contain elements other than carbon and hydrogen in the structure. As described above, it is for suppressing the residue of impurities in the deposited Ni.
- the hydrocarbon type Ni complex applied by this invention is an above-mentioned specific hydrocarbon type Ni complex. The reason why this Ni complex is applied among hydrocarbon-based Ni complexes is that it has moderate reactivity with hydrogen gas and excellent vaporization characteristics.
- This hydrocarbon Ni complex is a Ni complex in which a cyclopentadienyl group or a derivative thereof and a chain or cyclic alkenyl group or a derivative thereof are coordinated.
- a cyclic alkenyl group (cycloalkenyl group) is preferable, and any one of cyclobutenyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, cyclooctenyl, cyclononenyl, and derivatives thereof represented by the following formula is particularly preferable.
- Ni complexes coordinated with these are suitable for chemical vapor deposition because they are stably vaporized in the vaporization stage and easily decomposed at a low temperature in the film formation stage.
- cyclopentadienyl which is another ligand coordinated to Ni in this Ni complex, substitutes for an alkyl group in addition to all of the substituents (R 1 to R 5 ) being hydrogen atoms. It may be a derivative.
- the cyclopentadienyl derivative a derivative in which one of the substituents (R 1 to R 5 ) is an alkyl group and the remaining four substituents are hydrogen atoms is preferable.
- the substituent (R 1 to R 5 ) can have 0 to 6 carbon atoms, preferably 4 or less.
- the above precursor is vaporized and supplied to the Si substrate. At this time, the vaporized precursor is transported onto the substrate together with the reaction gas. This reaction gas applies hydrogen. This is to prevent impurities from remaining in the Ni film.
- the substrate is a Si substrate, which may be either single crystal Si or polycrystalline Si, and preferably has a high purity.
- Si substrate one obtained by removing the oxide film before forming the Ni film is applied.
- a continuous Ni film can be formed at a high speed when the surface of the Si substrate is doped with an appropriate amount of any of B, P, and As.
- the dose amount of B, P, or As is 10 18 atms / cm 3 at the maximum. This is because there is no change in the film formation rate even if it exceeds 10 18 atms / cm 3 . More preferably, it is 10 13 to 10 16 atms / cm 3 .
- the method for doping B, P, or As on the Si substrate is not particularly limited, and an ion implantation method, a thermal diffusion method, or the like can be applied.
- the film formation pressure and the film formation temperature are specified. These film forming conditions are important conditions for forming Ni directly on Si.
- the film formation pressure is specified for the amount of precursor supply required for film formation.
- the film forming pressure exceeds 150 torr, the precursor is hardly vaporized and the supply becomes insufficient. Further, the supply amount is insufficient even when it is lower than 1 torr.
- a preferable film forming pressure is 50 to 120 torr, and it is easy to obtain film continuity and smoothness.
- the film forming temperature is set to 80 to 250 ° C. If it is less than 80 degreeC, a film-forming reaction will not advance easily and it will be difficult to obtain a required film thickness.
- a preferred film forming temperature is 100 to 220 ° C. The film forming temperature means the heating temperature of the substrate.
- NiSi Ni silicide
- the purity is high and the formability is excellent immediately after the film formation. Since it is in direct contact with Si, it is easy to form a NiSi film by silicidation.
- Silicidation can be achieved by heating the substrate at 300 to 600 ° C. by heating the substrate in an inert gas (preferably nitrogen or argon) or hydrogen atmosphere.
- a Ni thin film can be manufactured in a state of being in direct contact with Si serving as a substrate.
- the Ni thin film formed according to the present invention does not contain impurities such as C, N, and O, can be easily silicided by an appropriate heat treatment, and can form a NiSi film.
- First Embodiment This embodiment was carried out in order to examine the formation of a Ni film on a Si substrate by a hydrocarbon-based Ni complex and the possibility of silicidation thereof.
- a plurality of high-purity Si substrates were prepared, and a film formation test was performed for each.
- As the Si substrate an Si substrate from which the oxide film was removed by pickling and an Si substrate in which the oxide film was left as it was without pickling were prepared. In pickling, the substrate was immersed in dilute hydrofluoric acid (0.5%) for 5 minutes to remove the oxide film on the surface.
- ( ⁇ 3 -cyclohexenyl) ( ⁇ 5 -cyclopentadienyl) nickel (II) was used as a precursor. Then, a nickel thin film was formed by a CVD method using a cold wall type film forming apparatus. After the film formation test, SEM observation was performed on the substrate surface to evaluate the possibility of Ni film formation.
- the film forming conditions are as follows.
- Precursor heating temperature 90 ° C
- Substrate heating temperature 200 ° C
- Carrier gas Argon 60sccm
- Reaction gas Hydrogen
- 100 ccm Pressure 100 torr Deposition time: 20 minutes
- the formed Ni thin film was heat-treated for silicidation.
- the substrate temperature was set to 500 ° C., and the substrate was heated in an atmosphere of 10 sccm of hydrogen gas + 10 sccm of argon. All heating times were 10 minutes.
- FIG. 1 is a SEM photograph of the Ni thin film and the heat-treated thin film on each substrate. From FIG. 1, it can be seen that Ni is directly formed on the Si substrate according to the precursor and film forming conditions applied in the present embodiment. And it can confirm that silicidation advances by heat-processing this, and the SiNi thin film was formed on the Si substrate. On the other hand, a Ni thin film is also formed on a Si substrate having an oxide film (SiO 2 ). However, no change is seen in the SiNi thin film even when this is heat-treated. This is presumably because the SiO 2 layer at the boundary between the Ni thin film and the Si substrate became a barrier layer and inhibited the diffusion of Si and was not silicided.
- SiO 2 oxide film
- Ni thin film was manufactured in a state where B was doped on the surface of the Si substrate.
- the substrate was doped with B by 10 15 atms / cm 3 of B by annealing at 900 ° C. for 30 minutes after ion implantation, and pickled in the same manner as described above before film formation.
- Ni film formation was performed using the same precursor (( ⁇ 3 -cyclohexenyl) ( ⁇ 5 -cyclopentadienyl) nickel (II)) as in the first embodiment. The speed was evaluated.
- the film forming conditions were as follows, and the film thickness of the Ni thin film was measured at film forming times of 1, 2, 5, and 15 minutes.
- Precursor heating temperature 90 ° C
- Substrate heating temperature 175 ° C
- Carrier gas Argon
- Reaction gas Hydrogen
- 100 ccm Pressure 100 torr Deposition time: 1 minute, 2 minutes, 5 minutes, 15 minutes
- FIG. 2 shows the results of this film formation test. From FIG. 2, almost no incubation time is observed in the film formation process of the Ni thin film on the B-doped Si substrate, and the growth starts promptly from the start of film formation. Further, the film thickness increases linearly with the film formation time. In this embodiment, a relatively good deposition rate of 8.2 nm / min is shown.
- the Ni thin film was silicided into the NiSi thin film by performing heat treatment on the substrate on which the Ni thin film was manufactured in 1 minute and 2 minutes in the present embodiment.
- the substrate temperature was set to 500 ° C., and the substrate was heated in an atmosphere of 10 sccm of hydrogen gas + 10 sccm of argon. All heating times were 10 minutes.
- FIG. 3 is SEM photographs before and after heat treatment of each Ni thin film.
- Each Ni thin film has a NiSi thin film formed thereon by heat treatment. Even when the Ni thin film was thin (film formation time 1 minute), uniform silicidation was confirmed without unevenness.
- FIG. 4 shows the results of XPS analysis of a NiSi thin film (Ni film formation time of 2 minutes).
- NiSi thin film formed in this embodiment no impurities of C, N, and O were measured. Further, the composition ratio of Ni and Si is almost 1: 1, and it can be confirmed that a Ni silicide thin film having a good quality could be obtained.
- the method according to the present invention can produce a Ni thin film directly on a Si substrate, and can obtain a high-quality Ni thin film free from residual impurities such as C, N, and O. Moreover, this Ni thin film can be made into a NiSi film as it is by heat treatment.
- the method according to the present invention is based on a thin film manufacturing process having excellent step coverage called chemical vapor deposition and is suitable for manufacturing a three-dimensional electrode having a three-dimensional structure of various semiconductor devices.
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Abstract
Description
第1実施形態:この実施形態は、炭化水素系Ni錯体によるSi基板へのNi成膜の形成及びそのシリサイド化の可否を検討するために行ったものである。ここでは、複数の高純度Si基板を用意してそれぞれについて成膜試験を行った。Si基板は、酸洗により酸化皮膜を除去したSi基板、酸洗を行わずに酸化皮膜をそのままにしたSi基板を用意した。酸洗は、希フッ酸(0.5%)に基板を5分間浸漬し、表面の酸化皮膜を除去した。
基板加熱温度:200℃
キャリアガス:アルゴン60sccm
反応ガス:水素、100ccm
圧力:100torr
成膜時間:20分
基板加熱温度:175℃
キャリアガス:アルゴン100sccm
反応ガス:水素、100ccm
圧力:100torr
成膜時間:1分、2分、5分、15分
Claims (3)
- Si基板として、表面に1013~1018atms/cm3のB、P、AsのいずれかをドープしたSi基板を用いる請求項1記載のニッケル薄膜の製造方法。
- 請求項1又は請求項2記載の方法によりニッケル薄膜を製造後、基板を不活性ガス又は水素雰囲気で300~600℃で加熱することにより、ニッケル薄膜をシリサイド化するNiシリサイド薄膜の製造方法。
Priority Applications (4)
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EP14851079.5A EP3054031B1 (en) | 2013-10-02 | 2014-09-18 | METHOD FOR PRODUCING NICKEL THIN FILM ON Si SUBSTRATE BY CHEMICAL VAPOR DEPOSITION METHOD, AND METHOD FOR PRODUCING Ni SILICIDE THIN FILM ON Si SUBSTRATE |
KR1020187017838A KR20180074803A (ko) | 2013-10-02 | 2014-09-18 | 화학 증착법에 의한 Si 기판 상에의 니켈 박막, 및 Si 기판 상에의 Ni 실리사이드 박막의 제조 방법 |
KR1020167009860A KR102066112B1 (ko) | 2013-10-02 | 2014-09-18 | 화학 증착법에 의한 Si 기판 상에의 니켈 박막, 및 Si 기판 상에의 Ni 실리사이드 박막의 제조 방법 |
US15/025,345 US9805936B2 (en) | 2013-10-02 | 2014-09-18 | Method for producing nickel thin film on a Si substrate by chemical vapor deposition method, and method for producing Ni silicide thin film on Si substrate |
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EP3532651A1 (en) | 2016-10-25 | 2019-09-04 | Basf Se | Process for the generation of thin silicon-containing films |
CN114008238B (zh) * | 2019-06-17 | 2024-07-02 | 田中贵金属工业株式会社 | 由有机锰化合物构成的化学蒸镀用原料和使用该化学蒸镀用原料的化学蒸镀法 |
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TW201623670A (zh) | 2016-07-01 |
EP3054031A4 (en) | 2017-06-07 |
TWI582260B (zh) | 2017-05-11 |
JP2015071805A (ja) | 2015-04-16 |
US20160233098A1 (en) | 2016-08-11 |
TWI555870B (zh) | 2016-11-01 |
KR102066112B1 (ko) | 2020-01-14 |
US9805936B2 (en) | 2017-10-31 |
EP3054031B1 (en) | 2019-01-30 |
KR20160057445A (ko) | 2016-05-23 |
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