WO2004090966A1 - 成膜方法及び成膜装置 - Google Patents
成膜方法及び成膜装置 Download PDFInfo
- Publication number
- WO2004090966A1 WO2004090966A1 PCT/JP2004/005082 JP2004005082W WO2004090966A1 WO 2004090966 A1 WO2004090966 A1 WO 2004090966A1 JP 2004005082 W JP2004005082 W JP 2004005082W WO 2004090966 A1 WO2004090966 A1 WO 2004090966A1
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- WIPO (PCT)
- Prior art keywords
- film
- hafnium
- gas
- compound
- hafnium silicate
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 41
- 239000007789 gas Substances 0.000 claims abstract description 98
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 94
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims abstract description 77
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 72
- 238000006243 chemical reaction Methods 0.000 claims abstract description 50
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000758 substrate Substances 0.000 claims abstract description 36
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000000137 annealing Methods 0.000 claims abstract description 31
- 150000002363 hafnium compounds Chemical class 0.000 claims abstract description 29
- PZPGRFITIJYNEJ-UHFFFAOYSA-N disilane Chemical compound [SiH3][SiH3] PZPGRFITIJYNEJ-UHFFFAOYSA-N 0.000 claims abstract description 23
- -1 hafnium organic compound Chemical class 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims description 18
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 16
- 229910000077 silane Inorganic materials 0.000 claims description 16
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 43
- 239000010703 silicon Substances 0.000 abstract description 43
- 238000002425 crystallisation Methods 0.000 abstract description 26
- 230000008025 crystallization Effects 0.000 abstract description 26
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 239000010408 film Substances 0.000 description 225
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 41
- 235000012431 wafers Nutrition 0.000 description 20
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 16
- 229920005591 polysilicon Polymers 0.000 description 16
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 14
- 229910000449 hafnium oxide Inorganic materials 0.000 description 13
- 229910021529 ammonia Inorganic materials 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 238000002441 X-ray diffraction Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 229910052814 silicon oxide Inorganic materials 0.000 description 6
- 238000005229 chemical vapour deposition Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 150000002894 organic compounds Chemical class 0.000 description 5
- 239000010453 quartz Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 239000006200 vaporizer Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- CZDYPVPMEAXLPK-UHFFFAOYSA-N tetramethylsilane Chemical compound C[Si](C)(C)C CZDYPVPMEAXLPK-UHFFFAOYSA-N 0.000 description 2
- IMFBFSHVKQVLCL-UHFFFAOYSA-N C(CCC)C(C(O[Hf])(CCCC)CCCC)(CC)CCCC Chemical compound C(CCC)C(C(O[Hf])(CCCC)CCCC)(CC)CCCC IMFBFSHVKQVLCL-UHFFFAOYSA-N 0.000 description 1
- SDHZVBFDSMROJJ-UHFFFAOYSA-N CCCCO[Hf] Chemical compound CCCCO[Hf] SDHZVBFDSMROJJ-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910007991 Si-N Inorganic materials 0.000 description 1
- 229910006294 Si—N Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- CKEGKURXFKLBDX-UHFFFAOYSA-N butan-1-ol;hafnium Chemical compound [Hf].CCCCO.CCCCO.CCCCO.CCCCO CKEGKURXFKLBDX-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- BUMGIEFFCMBQDG-UHFFFAOYSA-N dichlorosilicon Chemical compound Cl[Si]Cl BUMGIEFFCMBQDG-UHFFFAOYSA-N 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- IOOGPFMMGKCAGU-UHFFFAOYSA-N tetrasulfur Chemical compound S=S=S=S IOOGPFMMGKCAGU-UHFFFAOYSA-N 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—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
- H01L21/02112—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
- H01L21/02123—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
- H01L21/02142—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 silicon and at least one metal element, e.g. metal silicate based insulators or metal silicon oxynitrides
- H01L21/02148—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 silicon and at least one metal element, e.g. metal silicate based insulators or metal silicon oxynitrides the material containing hafnium, e.g. HfSiOx or HfSiON
-
- 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
- C23C16/40—Oxides
- C23C16/401—Oxides containing 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
- H01L21/02109—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
- H01L21/02205—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 the layer being characterised by the precursor material for deposition
- H01L21/02208—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 the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si
- H01L21/02211—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 the layer being characterised by the precursor material for deposition the precursor containing a compound comprising Si the compound being a silane, e.g. disilane, methylsilane or chlorosilane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/314—Inorganic layers
- H01L21/316—Inorganic layers composed of oxides or glassy oxides or oxide based glass
- H01L21/31604—Deposition from a gas or vapour
- H01L21/31645—Deposition of Hafnium oxides, e.g. HfO2
-
- 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
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—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
- 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
Definitions
- the present invention relates to a method and an apparatus for forming a high dielectric constant film that can be suitably used for a gate oxide film of a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or a capacitance element of a memory cell.
- MOSFET Metal Oxide Semiconductor Field Effect Transistor
- the gate oxide film of MOSFETs has been required to have low leakage current, high withstand voltage, and high reliability.In recent years, however, the capacity has been reduced to further improve the operation speed. There is a further need to do so. The thinner the film thickness, the smaller the capacitance.
- the silicon oxide film (SiO) SiO
- the problem (2) is that when the film thickness is reduced, the leak current becomes too large to be ignored.
- the electrical thickness (To) is a value obtained by converting the thickness of a film made of a certain material into the thickness of a silicon oxide film on the basis of capacitance, and can be expressed by the following equation.
- ⁇ i is the physical thickness of the film
- etc. 1 is the relative dielectric constant of the material forming the film
- ⁇ is the relative dielectric constant of the silicon oxide film.
- hafnium oxide film (Hf02 film) has attracted attention as a high dielectric constant film.
- Hafnium oxide has a relative permittivity of about 40, which is considerably higher than that of silicon oxide, which has a relative permittivity of about 4.
- JP2002-343790 A contains Tetra Yuichi Shaributoxyhafnium It is described that a hafnium oxide film is formed on a substrate by alternately irradiating an organometallic compound material such as an oxygen radical or a nitrogen radical, and a tetrabutyl-butoxyhafnium and a tetramethylsilane. It is described that a hafnium silicate film is formed by alternately irradiating a mixture of oxygen and oxygen radicals.
- an organometallic compound material such as an oxygen radical or a nitrogen radical
- JP 2002-2464 388 A describes that a hafnium oxide film is formed by reacting an organic compound of hafnium with oxygen or ozone as an oxidizing gas by a low pressure CVD method. It is also suggested that a liquid organic compound containing hafnium and silicon be used as a raw material.
- a gate oxide film is formed, a polysilicon film is stacked, and boron or phosphorus is implanted into the polysilicon film to form a gate electrode. Thereafter, annealing at about 100 ° C. for a short time is performed. Done. Hafnium oxide is partially crystallized when exposed to high temperatures, even for short periods of time. When the hafnium oxide film is crystallized, a current leaks between crystal grains, causing a problem that a leak current of the gate oxide film increases.
- the crystallization temperature of the film may be improved by the presence of silicon.
- organic materials as a source of silicon increases the amount of carbon incorporated into the hafnium silicate film. This causes problems such as an increase in fixed charge, a decrease in device reliability, and a withstand voltage failure.
- this mixing ratio may be incompatible with other process conditions. Disclosure of the invention
- the present invention has been made under such circumstances, and a main object thereof is to provide a method and a film forming apparatus for forming a hafnium compound film having a high crystallization temperature.
- the film forming method comprises: a hafnium organic compound in a reaction vessel. And reacting a silane-based gas with the silane-based gas to form a hafnium silicate film on the substrate.
- a chemical vapor deposition (CVD) method can be used.
- the inside of the reaction vessel is heated to a reduced pressure, and the hafnium organic compound is supplied to the reaction vessel in a vapor state.
- the silane-based gas a gas which can be represented by S in H (2n + 2) can be used, and preferably, monosilane (SiH 4) gas or disilane (SH s) gas is used. it can. It is also possible to use both monosilane gas and disilane gas together.
- the hafnium silicate film obtained by the method of the present invention since the silicon taken in the film suppresses crystallization of the film, the film becomes crystallized when the temperature of the hafnium silicate film is increased. The temperature leading to the formation is high. Therefore, when the hafnium silicate film is exposed to a high temperature after the hafnium silicate film is formed, for example, a polysilicon film laminated on the hafnium silicate film after the formation of the hafnium silicate film When the annealing is performed, the hafnium silicate film is less likely to be crystallized, and the leak current of the anodium silicate film is reduced.
- the hafnium silicate film obtained according to the present invention is preferably applied to a gate oxide film of MOS FET, but can also be applied to other elements, for example, a capacitance element of a memory cell.
- the film is annealed in an atmosphere of a compound gas containing nitrogen and hydrogen, for example, an ammonia gas. It is characterized by.
- a compound gas containing nitrogen and hydrogen for example, an ammonia gas.
- the crystallization temperature of the oxygen-containing hafnium compound film can be further increased.
- a silicon nitride film may be formed thereon.
- the silicon nitride film is also a high dielectric constant film. Therefore, in this case, a high dielectric constant film having a two-layer structure composed of a hafdium compound film and a silicon oxide film is formed.
- the oxygen-containing hafnium compound film according to the second aspect of the present invention is preferably a hafnium silicate film obtained by the film forming method according to the first aspect of the present invention. Is not limited, and may not include silicon. Even in such an oxygen-containing hafnium compound film containing no silicon, the effect of improving the crystallization temperature by annealing in a compound gas atmosphere composed of nitrogen and hydrogen is produced.
- hafnium compound film (hafnium silicate film) in which silicon is incorporated is obtained.
- a hafnium compound film is obtained. Therefore, for example, even if this hafdium compound film is exposed to a high-temperature atmosphere in a subsequent process, crystallization is suppressed, and a leak current when a voltage is applied is small. Since a silane-based gas such as a monosilane gas or a disilane gas is used as a silicon addition source, the silicon content can be freely and easily adjusted by adjusting the gas supply amount.
- the hafnium compound film is annealed in a heating atmosphere with ammonia gas or the like, a hafnium compound film having a high crystallization temperature can be obtained as is clear from the examples.
- the present invention provides a film forming apparatus which can be suitably used for performing the above-described film forming method.
- the film forming apparatus includes: a reaction vessel into which a substrate is loaded; heating means for heating an atmosphere in the reaction vessel; first gas supply means for supplying a vapor of a hafnium organic compound to the reaction vessel; A second gas supply unit that supplies a silane-based gas to the reaction container; a pressure adjustment unit that adjusts a pressure in the reaction container; and reacting the hafnium organic compound with the silane-based gas in the reaction container. And a control means for controlling the heating means, the first gas supply means, the second gas supply means and the pressure adjusting means so that the hafnium silicate film is formed on the substrate.
- FIG. 1 is a longitudinal sectional view showing an embodiment of the film forming apparatus of the present invention.
- FIG. 2 is an explanatory view schematically showing a series of steps of a film forming method according to the present invention.
- '3, c 4 a series of steps of another film formation method according to the present invention is an explanatory view schematically showing the after heating the hafnium silicate film obtained by using the Hafuniumu organic compound and disilane 6 is a graph showing the results of X-ray diffraction analysis.
- FIG. 5 shows the hafnium obtained using the hafnium organic compound and monosilane gas.
- FIG. 4 is a graph showing the result of X-ray diffraction analysis after heating of a musisilicate film.
- FIG. 6 is a graph showing the result of X-ray diffraction analysis after heating a hafnium oxide film obtained without using a silane-based gas.
- FIG. 7 is a graph showing the results of X-ray diffraction analysis of a hafnium silicate film formed using disilane gas and then annealed in an ammonia gas atmosphere after heating.
- FIG. 8 is a graph showing the result of X-ray diffraction analysis after heating of a hafnium silicate film formed in an ammonia gas atmosphere after being formed using a monosilane gas.
- Figure 9 shows the voltage-capacitance characteristics of the M0S capacity structure consisting of the N-type silicon substrate-hafnium silicate film-silicon nitride film-P-type gate electrode, with and without the silicon nitride film. It is a graph shown in comparison. Description of the preferred embodiment
- FIG. 1 shows a configuration of a batch type decompression CVD apparatus which is a vertical heat treatment apparatus.
- Reference numeral 1 in FIG. 1 denotes a reaction tube or reaction vessel having a double tube structure having an inner tube 1a and an outer tube 1b made of quartz.
- a metal cylindrical manifold 11 is provided at the lower part of the reaction tube 1.
- the upper end of the inner pipe 1a is open, and the lower end of the inner pipe 1a is supported by an inner protrusion of the manifold 11.
- the upper end of the outer tube 1 b is closed, and the lower end of the outer tube 1 b is air-tightly joined to the upper end of the manifold 11.
- Reference numeral 12 indicates a base plate.
- FIG. 1 shows a state in which a wafer W is loaded into the reaction tube 1 for a film forming process.
- a plurality of wafers W that is, objects to be processed
- a quartz wafer boat 2 that is, a holder
- 25 product wafers are mounted on the wafer boat 2
- dummy wafers are mounted above and below the product wafers.
- the wafer boat 2 is held on a lid 21 via an installation area of a quartz heat insulating unit 22.
- the heat insulation unit is a combination of a heat insulation unit and a heating unit made of quartz fins. Let it be.
- the rotating shaft 23 penetrates the center of the heat retaining unit 22, and the wafer boat 2 is rotated via the rotating shaft 23 by the motor M provided on the boat elevator 24.
- the lid 21 is mounted on a boat elevator 24 for loading and unloading the wafer boat 2 into and from the reaction tube 1.
- a boat elevator 24 for loading and unloading the wafer boat 2 into and from the reaction tube 1.
- a heater 30 (that is, a heating means) composed of, for example, a resistance heating heater wire is provided so as to surround the reactor tube 1.
- a heater 30 there is a structure in which a linear flexible carbon wire obtained by knitting a bundle of high-purity fine carbon fibers is enclosed in a transparent quartz tube.
- the main heater covers most of the area inside the reaction tube 1, the sub heaters arranged above and below the main heater, and the heater arranged on the ceiling of the reaction tube 1. However, all of these main sub-heads are given the reference numeral 30.
- the furnace body (cover) is located around Hi-Ichi 30).
- the first gas supply pipe 4 is provided with a liquid source supply source 41, a noreb 42, a liquid source, which is a source of a hafnium organic compound, for example, tetrahexabutoxyhafnium (Hf [OC (CH3) 3] 4).
- the mass flow controller 43, the vaporizer 44, and the valve 45 are provided in this order from the upstream side.
- the liquid source supply 41 is composed of a device configured to extrude the hafnium organic compound by supplying a pressurized gas to a tank storing the liquid hafnium organic compound.
- the second gas supply pipe 5 is provided with a disilane gas supply source 51 for supplying a silane-based gas, for example, disilane (SizHe) gas, a valve 52, a mass flow controller 53 serving as a flow rate adjusting unit, and a valve 54 on the upstream side.
- a disilane gas supply source 51 for supplying a silane-based gas, for example, disilane (SizHe) gas
- a valve 52 for example, disilane (SizHe) gas
- a mass flow controller 53 serving as a flow rate adjusting unit
- a valve 54 on the upstream side.
- the third gas supply pipe 6 includes an ammonia gas supply source 61 for supplying ammonia (NH3) gas, a valve 62, a mass flow controller 63, which is a flow rate adjusting unit, and a valve.
- Lubes 64 are provided in this order from the upstream side.
- the gas supply devices such as valves, flow controllers, and vaporizers provided
- An exhaust pipe 13 is connected to the manifold 11 so that the space between the inner pipe 1a and the outer pipe 1b can be exhausted.
- a vacuum pump (not shown) is connected to the exhaust pipe 13 via a pressure adjusting unit 14.
- This decompression CVD device includes a control unit 7 composed of a computer.
- the control unit 7 has a function of activating a processing program, reading out a description of a process recipe in a memory (not shown), and controlling processing conditions based on the recipe. And a control signal for controlling the first to third gas supply means 40 to 60.
- the wafer port 2 holding the semiconductor wafer W is raised by the boat elevator 24 and is carried into the reaction tube 1. This state is shown in FIG. An N-type or P-type silicon film has already been formed on the surface of the silicon wafer W.
- the temperature in the reaction tube 1 is raised to a predetermined process temperature (for example, 200 to The temperature is raised to 300 ° C., and the inside of the reaction tube 1 is evacuated to a predetermined degree of vacuum by a vacuum pump 15 via an exhaust tube 13.
- a liquid tetra-sulfur-toxic oxyhafnium is sent out from a liquid source supply source 41, and a predetermined flow rate (for example, 0.02 sccm) is supplied by a liquid mass flow controller 43. After being adjusted to ll sccm), it is sent to the vaporizer 44, where it is vaporized by the vaporizer 44 into vapor, and this vapor is supplied into the reaction tube 1. Further, the disilane gas is adjusted to a predetermined flow rate (for example, 50 to 100 Osccm) by the mask port controller 53 and supplied into the reaction chamber 1 through the second gas supply pipe 5.
- a predetermined flow rate for example, 0.02 sccm
- the pressure in the reaction tube 1 is adjusted to a predetermined pressure, for example, a reduced pressure atmosphere of 26.6 Pa to 1333 Pa (0.2 to 1 ⁇ O Torr) by the pressure adjusting section 14.
- a predetermined pressure for example, a reduced pressure atmosphere of 26.6 Pa to 1333 Pa (0.2 to 1 ⁇ O Torr)
- the pressure adjusting section 14 As a result, in the reaction tube 1, Gas and disilane gas are thermally decomposed, and a thin film containing hafnium, oxygen and silicon, that is, a hafnium silicate film is formed on the wafer W.
- the wafer boat 2 is rotated by the motor M.
- the supply of the film forming gas is stopped, the inside of the reaction tube 1 is replaced with an inert gas, and the wafer boat 2 is carried out (unloaded) from the reaction tube 1. After that, a polysilicon film serving as a gate electrode is formed on the unloaded wafer W by another film forming apparatus.
- hafnium silicate film containing silicon in addition to hafnium and oxygen is formed. Since silicon has a function of suppressing crystallization of hafnium oxide, the obtained hafnium compound film (that is, a high dielectric constant film) has a high crystallization temperature, as is clear from the examples described later. Therefore, for example, even if the polysilicon film on the hafnium silicate film is subjected to a high-temperature annealing process in the manufacturing process of the MOS FET, the crystallization of the hafnium silicate film is suppressed. For this reason, the leak current of the gate oxide film made of the hafnium silicate film is reduced, and M0S FET with excellent electric characteristics can be obtained.
- disilane gas having a low decomposition temperature since disilane gas having a low decomposition temperature is used, the content of silicon in the hafnium compound film can be increased, and the effect of suppressing crystallization is large. Further, since the disilane gas does not contain carbon, an increase in the carbon content in the hafnium compound film as in the case of using a silicon organic compound as a silicon supply source can be avoided.
- disilane gas is used as the silane-based gas.
- monosilane (SiH 4) gas may be used, and other forces represented by S in H (2 n + 2) may be used. May be used.
- a compound of nitrogen and hydrogen for example, ammonia (NH 3) gas is supplied to the hafnium compound film while the film is being heated to perform an annealing treatment (that is, a reforming treatment).
- NH 3 ammonia
- This annealing treatment can be performed subsequent to the formation of the hafnium silicate film in the first embodiment described above.
- wafer W that is, The substrate can be continuously processed without being unloaded from the reaction tube 1, that is, without being exposed to the atmosphere.
- the gas in the reaction tube 1 is completely exhausted by a vacuum pump (not shown), and then the temperature inside the reaction tube 1 is raised to a predetermined temperature (for example, 500 to 900 ° C). I do. Then, while supplying the third ammonia gas at a gas supply pipe 6 a constant flow (e.g. 2 slm), a predetermined pressure the pressure in the reaction tube 1, for example 2.66 xl 0 2 ⁇ 1.60xl 0 4 Pa (2 ⁇ Adjust to 120 Torr and perform annealing for a predetermined time (eg, 5 to 60 minutes).
- a predetermined temperature for example, 500 to 900 ° C.
- control unit 7 reading out a predetermined recipe and controlling each unit.
- FIG. 2 is a diagram schematically illustrating a series of steps.
- 2 (a) and 2 (b) show a process of forming a hafnium silicate film 82 on a p-type silicon film (silicon layer) 81 using tetra-butyl-butadiene and disilane gas.
- FIG. 2C shows that the annealing process is performed on the hafnium silicate film 82 (the second embodiment).
- Correspondence When a hafnium compound film, for example, a hafnium silicate film is annealed by ammonia as described above, the crystallization temperature is improved by, for example, about 50 ° C., as will be apparent from the examples described later. Although the reason is not clear, it is considered that a bond of Si-N and Hf-N is formed, thereby suppressing the phase separation between Hf02 and Sio2, thereby suppressing crystallization.
- the hafnium silicate film is annealed has been described. It is also effective in suppressing crystallization of the hafnium oxide film obtained by decomposition. Further, the formation of the hafnium compound film and the annealing using an ammonia may be performed by separate apparatuses.
- FIG. 3 (a) ⁇ ( The process shown in c) is performed. Then, after the step (c), the hafnium silicate film 82 annealed with ammonia is placed on the hafnium silicate film 82 as shown in FIGS. Then, a silicon nitride film (Si 3 N 4) 83 is formed using ammonia gas and dichlorosilane (SiH 2 Cl 2 ) gas.
- the conditions for forming the silicon nitride film are as follows: the temperature in the reaction tube (process temperature) is 650 ° C .; the pressure in the reaction tube (process pressure) is 0.15 Torr; and the flow rates of ammonia gas and dichlorosilane gas. Are set to 15 Osccm and 3 Osccm, respectively, whereby a silicon nitride film having a thickness of about 0.35 nm is formed. Further, as shown in FIG. 3F, a polysilicon film 84 serving as a gate electrode is formed on the silicon nitride film 83 by a method known to those skilled in the art.
- the silicon film 81 is N-type and the polysilicon film 84 is P-type.
- This configuration is exemplified here because the P-type polysilicon film 84 is used when a voltage is applied to the laminate to evaluate the electrical characteristics.
- the silicon film 81 can be a P-type and the polysilicon film 84 can be an N-type.
- the gate electrode structure is manufactured by such a manufacturing process, the gate electrode (polysilicon film) is clearly compared with the case where the polysilicon film 84 is directly laminated on the hafnium silicate film 8 as will be described later in the embodiment.
- a flat band voltage (Vfb) shift when a voltage is applied between the film 84) and the silicon film 81 can be suppressed.
- Vfb flat band voltage
- the reason is that if a polysilicon film is formed directly on a hafnium silicate film, some reactant is generated at the interface between these films, and this reactant causes the Vfb shift to increase. It is considered that the interposition of the silicon nitride film 83 between the films serves as a barrier layer, thereby preventing the reaction between the hafnium silicate film and the polysilicon film.
- the hafnium organic compound as the liquid source used in the above-described first to third embodiments is not limited to tetra-u-sharybutoxyhafnium, but may be other hafnium alkoxides such as Hf (0 C 3 H7) It may be four.
- the gas used for annealing the hafnium compound film is not limited to ammonia, and may be a gas of another compound composed of nitrogen and hydrogen, for example, hydrazine (N2H2).
- the layer on which the hafnium oxide film is formed (the layer denoted by reference numeral 81 in FIGS. 2 and 3) is the P-type or N-type silicon substrate itself. It may be a P-type or N-type silicon film formed on a silicon substrate.
- the high dielectric constant film obtained according to the present invention can be used, for example, as a capacitance element used in a memory, in addition to a gate oxide film.
- the film forming apparatus used at the time of film forming is not limited to the batch type, and may be a single wafer type.
- a hafnium silicate film with a thickness of about 15 nm was formed on a plurality of silicon substrates on which a P-type silicon film had already been formed.
- the film forming conditions are as follows.
- Tetra-sulfur butoxyhafnium flow rate 0.25 sccin (liquid flow rate)
- Disilane gas flow rate 1000 sccm
- each substrate was subjected to a temperature of 800 ° C, 850 ° C, 900 ° ⁇ and 950 ° C under an inert gas atmosphere. For 1 minute. Then, X-ray diffraction analysis was performed on the heated hafnium silicate film. Fig. 4 shows the results. As can be seen from the results, a peak of hafnium oxide (111) appears at a position where the diffraction angle 20 is around 30 degrees on the substrate heated at 900 ° C, but not on the substrate heated at 850 ° C. No peak has appeared. This indicates that the hafnium silicate film obtained under the above film forming conditions does not crystallize at 850 ° C.
- a hafnium silicate film with a thickness of about 15 nm was formed on a plurality of silicon substrates on which a P-type silicon film had already been formed.
- the flow rate of the monosilane gas is 100 Osccm as in the first embodiment.
- Other film forming conditions are the same as those in the first embodiment.
- the crystallization temperature of the hafnium silicate film is sufficiently high, but the crystallization temperature is lower than when disilane gas is used.
- the decomposition temperature of disilane gas is lower than that of monosilane gas, so that a larger amount of silicon is incorporated into the hafnium silicate film than when monosilane gas is used. This is thought to be due to the large silicon composition ratio to hafnium.
- Example 2 Using the same apparatus as in Example 2, a 15 nm-thick hafnium oxide film was formed on a plurality of silicon substrates on which a P-type silicon film had already been formed.
- the film forming conditions are as follows. That is, in Comparative Example 1, no silane-based gas was used for film formation.
- a 12.63 nm-thick hafnium silicate film was formed on each of a plurality of P-type silicon substrates.
- an annealing treatment was performed on the film under an ammonia gas atmosphere using a vertical heat treatment apparatus different from the apparatus on which the hafnium silicate film was formed.
- the annealing conditions are as follows.
- Reaction tube temperature 600-900 ° C
- Annealing time 30 minutes
- the substrate after the annealing treatment was heated under the same conditions as in Example 1, and the same analysis was performed on the thin film on the substrate surface.
- Figure 7 shows the results. As can be seen from the results, a peak appears for the substrate heated at 950 ° C, but no peak appears for the substrate heated at 900 ° C. Accordingly, it can be seen that the hafnium silicate film obtained under the film forming conditions and annealing conditions according to Example 3 does not crystallize at 900 ° C. In contrast, the hafnium silicate film obtained under the film forming conditions according to Example 1 (without annealing) was crystallized at 900 ° C.
- annealing with ammonia increases the crystallization temperature of the hafnium silicate film.
- a hafnium silicate film having a thickness of 12.63 nm was formed on each of a plurality of N-type silicon substrates. Thereafter, the hafnium silicate film was annealed under the same annealing conditions as in Example 3 above. Thereafter, a polysilicon film was formed on the honeycomb silicate film, and boron was implanted into the polysilicon film to form a gate electrode.
- a MOS capacity structure was created. Apart from this, only the point of not annealing the hafnium silicate film There is a different MOS capacity structure. A voltage is applied between the gate electrode of the MOS capacitance structure and the N-type silicon film to measure the capacitance therebetween, and based on the measured capacitance, the electrical film thickness of the hafnium silicate film is determined. I asked.
- the electrical thickness of the hafnium silicate film without annealing was 1.6 nm, whereas the electrical thickness of the hafnium silicate film with annealing was 1.2 nm. Therefore, it can be seen that by performing annealing on the hafnium compound film in an ammonia atmosphere, the electrical film thickness is reduced, that is, the relative dielectric constant is increased.
- Example 3 Under the same film forming conditions as in Example 2 (using monosilane gas), a hafnium silicate film having a film thickness of 12.63 nm was formed on each of a plurality of P-type silicon substrates. Next, the film was annealed under an ammonia gas atmosphere under the same annealing conditions as in Example 3.
- each of the thus obtained substrates with a hafnium silicate film was subjected to 800 ° 850 under an inert gas atmosphere. C, heated at 900 and at a temperature of 950 ° C for 1 minute. Then, X-ray diffraction analysis of the heated hafnium silicate film was performed. Fig. 8 shows the results.
- the hafnium silicate film obtained in this example does not crystallize at 850 ° C.
- Example 2 since crystallization was performed at 850 ° C., even when a hafnium silicate film was formed using monosilane gas, annealing was performed using ammonia. It can be seen that the crystallization temperature of the hafnium silicate film increases.
- a hafnium silicate film was formed using disilane gas, and then this film was annealed in an ammonia atmosphere. After that, dichlorosilane gas and ammonia are deposited on the hafnium silicate film.
- a silicon nitride film was formed by low pressure CVD using a gas. The thickness of the hafnium silicate film measured after annealing with ammonia was 2 to 3 im, and the thickness of the silicon nitride film was 0.5 to 1.5 nm.
- a polysilicon film forming a gate electrode was formed on the silicon nitride film, thereby obtaining a MOS capacity structure. Then, a voltage was applied between the gate electrode and the P-type silicon substrate, and the relationship between the applied voltage and the capacitance was examined. The results are shown in Fig. 9 as curve (1).
- Example 5 Comparing the test results of Example 5 and Comparative Example 3, the electrical characteristics were further improved by stacking a silicon nitride film on the hafnium silicate film and using this stacked body as a gate capacitance film.
Abstract
Description
Claims
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JP2003104437A JP2004311782A (ja) | 2003-04-08 | 2003-04-08 | 成膜方法及び成膜装置 |
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JP4542807B2 (ja) * | 2004-03-31 | 2010-09-15 | 東京エレクトロン株式会社 | 成膜方法および成膜装置、ならびにゲート絶縁膜の形成方法 |
JP2005317583A (ja) | 2004-04-27 | 2005-11-10 | Renesas Technology Corp | 半導体装置およびその製造方法 |
JP4455225B2 (ja) * | 2004-08-25 | 2010-04-21 | Necエレクトロニクス株式会社 | 半導体装置の製造方法 |
KR100877100B1 (ko) * | 2007-04-16 | 2009-01-09 | 주식회사 하이닉스반도체 | 비휘발성 메모리 소자 제조 방법 |
US20090035928A1 (en) * | 2007-07-30 | 2009-02-05 | Hegde Rama I | Method of processing a high-k dielectric for cet scaling |
KR101451716B1 (ko) * | 2008-08-11 | 2014-10-16 | 도쿄엘렉트론가부시키가이샤 | 성막 방법 및 성막 장치 |
KR101675378B1 (ko) * | 2010-02-25 | 2016-11-23 | 삼성전자주식회사 | 연마 슬러리 및 그를 이용한 절연막 평탄화 방법 |
JP5805461B2 (ja) * | 2010-10-29 | 2015-11-04 | 株式会社日立国際電気 | 基板処理装置および半導体装置の製造方法 |
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 |
US11295954B2 (en) * | 2016-07-04 | 2022-04-05 | Mitsubishi Electric Corporation | Manufacturing method for a semiconductor device including a polysilicon resistor |
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- 2004-04-08 US US10/552,468 patent/US20060216953A1/en not_active Abandoned
- 2004-04-08 KR KR1020057014315A patent/KR20060002756A/ko not_active Application Discontinuation
- 2004-04-08 WO PCT/JP2004/005082 patent/WO2004090966A1/ja active Application Filing
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