WO2006085427A1 - 容量素子の製造方法及び半導体装置の製造方法並びに半導体製造装置 - Google Patents
容量素子の製造方法及び半導体装置の製造方法並びに半導体製造装置 Download PDFInfo
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- 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
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- 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
- C23C16/455—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 introducing gases into reaction chamber or for modifying gas flows in reaction chamber
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- 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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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
- C23C28/3455—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer with a refractory ceramic layer, e.g. refractory metal oxide, ZrO2, rare earth oxides or a thermal barrier system comprising at least one refractory oxide layer
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- 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
- H01L21/02172—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 at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
- H01L21/02197—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 at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides the material having a perovskite structure, e.g. BaTiO3
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- 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
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- H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
- H01L28/40—Capacitors
- H01L28/55—Capacitors with a dielectric comprising a perovskite structure material
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- H10B53/00—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B53/00—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors
- H10B53/30—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors characterised by the memory core region
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- 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
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- 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
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Definitions
- Capacitance element manufacturing method semiconductor device manufacturing method, and semiconductor manufacturing apparatus
- the present invention relates to a capacitor element manufacturing method, a semiconductor device manufacturing method, and a semiconductor manufacturing apparatus, and more particularly to a manufacturing technique and a manufacturing apparatus suitable for manufacturing a capacitor element including a dielectric made of a metal oxide. .
- a semiconductor device has been configured with a capacitive element in which a dielectric layer is formed on a lower electrode, and an upper electrode is formed on the dielectric layer! RU
- the dielectric layer of such a capacitive element is required to have a low leakage current and a high dielectric constant in order to ensure element characteristics.
- Dielectric layers that satisfy these requirements include (Ba, Sr) TiO (hereinafter referred to as “BST”) and Ta.
- High-dielectric materials made of metal oxides such as O are attracting attention, and DRAM (dynamic
- PZT Pb (Zr, Ti) 0
- Ferroelectric materials made of metal oxides are attracting attention as non-volatile memory materials and are used in FeR AM (Ferroelectric Random Access Memory).
- metals such as Ir, Ru, and Pt, which are platinum group elements, are mainly used as the material constituting the lower electrode. V, but importance is placed on relaxation of polarization fatigue and oxygen barrier properties at high temperatures.
- oxide conductors such as IrO and SrRuO may be used.
- dielectric includes both “high dielectric” and “ferroelectric”.
- the sol-gel method is a method of polycrystallizing by applying a sol-gel raw material solution on the lower electrode and subjecting it to an annealing treatment in an oxygen atmosphere, but the orientation of the polycrystal is uneven.
- the sputtering method is This is a method in which a film is formed using a target of a ramix sintered body and then annealed in an oxygen atmosphere.
- the composition of the dielectric is determined by the target, so the composition of the dielectric layer is optimized. Difficult to do. Furthermore, since the annealing method has a high annealing temperature, there is a risk of causing problems in the process such as thermal effects on other layers.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-58525
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-57156
- Patent Document 3 Japanese Patent Laid-Open No. 2002-334875
- Patent Document 4 Japanese Patent Laid-Open No. 2003-318171
- JP-A-2003-324101 discloses a method for changing the concentration of an oxidizing gas during the formation of a dielectric layer, and an atmosphere in which the substrate surface is at an oxygen concentration of 100% before the film formation. A method of heat treatment in it was proposed!
- Non-Patent Document 1 3 ms "Japan Jouurnal of Applied Physics Vol. 43, No. 5A, 2004, pp.2655— 2600 Japan Society of Applied Physics (Non-Patent Document 1) is a PZT thin film formed by MOCVD on the lower electrode with IrO force.
- Non-Patent Document 1 IrO is easily reduced to Ir by the solvent butyl acetate or THF (tetrahydrofuran), or an organometallic material gas (precursor), and oxidation and reduction
- the boundary depends on the solvent, the partial pressure ratio between the precursor and O, and the wafer temperature.
- Fatigue characteristics of polarization reversal This is a characteristic that the polarization amount (capacitance value) of the capacitive element decreases by repetition.
- the imprint characteristic is a characteristic in which the hysteresis characteristic of the capacitive element shifts in the positive voltage direction or the negative voltage direction.
- the retention characteristic is a characteristic indicating a change with time in the polarization amount (capacitance value).
- the lower electrode made of a metal material such as Ir may be exposed to an oxidizing atmosphere.
- the surface of the lower electrode is insufficiently oxidized or is different from the dielectric layer as described later.
- a metal oxide having a composition adheres.
- the film quality of the dielectric layer is affected by the acid atmosphere, the reproducibility of the interface state between the lower electrode and the dielectric layer and the film quality of the dielectric layer is reduced, and the reproducibility of the electric characteristics of the capacitive element is ensured.
- the surface of the dielectric film formed on the surface of the lower electrode may be roughened due to acidification of the surface of the lower electrode (resulting in surface morphology). .
- the object of the present invention is to ensure and stabilize the reproducibility of the electrical characteristics of the capacitive element, It is an object of the present invention to provide a capacitor element manufacturing method, a semiconductor device manufacturing method, and a semiconductor manufacturing apparatus capable of smoothing the surface of a dielectric layer (improvement of surface morphology).
- the temperature in the chamber is changed with the oxygen-containing gas and the inert gas first introduced into the chamber. While adjusting the pressure conditions, the flow rate of the organometallic material gas is stabilized by flowing the organometallic material gas from the raw material supply system to a path that does not pass through the chamber such as the bypass line, and these various conditions are sufficiently stable. Then, by introducing the organometallic material gas into the chamber, the reaction between the organometallic material gas and the oxidizing gas started to start film formation on the substrate.
- the present inventor examined the situation at the beginning of such a film formation process.
- the introduction of the oxygen-containing gas before the organometallic material gas was introduced into the chamber caused Ir and It has been found that the surface of the lower electrode, which is a metal material force such as Ru, is incompletely oxidized, and an unintended impurity element adheres to the surface of the lower electrode.
- these defects reduce the reproducibility of the interface state between the lower electrode and the dielectric layer, and also cause poor crystallinity and surface morphology of the dielectric layer due to non-uniformity of the surface structure of the lower electrode.
- the reproducibility of the electrical characteristics (fatigue characteristics, imprint characteristics, retention characteristics) of the capacitive elements would be reduced and unstable.
- the present inventor has made it possible to prevent the oxygen-containing gas that accompanies at least one organometallic material gas from reaching the surface of the lower electrode before the film formation is started. Focusing on the fact that the surface state uniformity and reproducibility of the lower electrode before the film can be improved, the present invention described below has been completed.
- a method for manufacturing a capacitive element according to the present invention includes: (a) forming an insulating film on a substrate to be processed; (b) forming a lower electrode layer on the insulating film; A first step (cl) of supplying at least one of one or more kinds of organometallic material gases and a vaporized organic solvent on the lower electrode layer in a state where no inert gas is supplied; A second step (c2) for supplying both a material gas and an oxidizing gas onto the lower electrode layer, and the first step (cl) and the second step (c2) are the same.
- a dielectric layer is formed on the lower electrode layer by continuously performing in a chamber; and (d) an upper electrode layer is formed on the dielectric layer. Is formed.
- one or a plurality of types of organometallic material gas may be supplied or a vaporized organic solvent may be supplied.
- the vaporized organic solvent is supplied, and at least one kind of organometallic material gas is supplied.
- the organometallic material gas supplied in the first step (cl) and the organometallic material gas supplied in the second step (c2) have the same composition. Furthermore, it is desirable that the partial pressure of the organic metal material gas is substantially the same in the first step (cl) and the second step (c2).
- the lower electrode layer in step (b) preferably contains a platinum group element. In particular, it is more effective when the platinum group element is Ir or Ru.
- the dielectric formed in step (c) is preferably a ferroelectric. Furthermore, the dielectric formed in step (c) is particularly effective when it is Pb (Zr, Ti) 0.
- the organometallic material solution is desirably produced by dissolving an organometallic material in an organic solvent.
- organic solvent examples include butyl acetate.
- the capacitive element is usually configured by forming the metal layer as a lower electrode and forming the upper electrode on the dielectric layer.
- each of the lower electrode and the upper electrode may be composed of a single layer, or may be composed of a plurality of conductor layers.
- a method for manufacturing a semiconductor device includes (a) partially removing the surface of a substrate to be processed to form an element isolation film, and (b) implanting impurities into a part of the element region. Forming a source region and a drain region; (c) forming a gate insulating film between the source region and the drain region; (d) forming a gate electrode on the gate insulating film; ) Forming an interlayer insulating film so as to cover the element isolation film and the gate electrode; (f) forming a contact hole in the interlayer insulating film; and (g) the source region and the drain through the contact hole.
- a semiconductor manufacturing apparatus has a mounting table for supporting a substrate, a chamber surrounding the periphery of the substrate, and one or a plurality of types of organometallic material gas and oxidizing gas in the chamber. And a raw material supply unit for supplying the vaporized organic solvent, an exhaust unit for exhausting the chamber, and one or a plurality of types of organics that do not supply the oxidizing gas into the chamber in the first period. At least one of a metal material gas and a vaporized organic solvent is supplied into the chamber, and then the organometallic material gas and the oxidizing gas are both supplied from the source supply unit in a second period. A control unit that controls the raw material supply unit so that the supply operation in the first period and the supply operation in the second period are continuously performed. , Characterized by including the.
- the control unit supplies at least one kind of organometallic material gas, supplies a vaporized organic solvent, or vaporizes the raw material supply unit into the chamber from the raw material supply unit.
- An organic solvent may be supplied, and at least one organic metal material gas may be supplied.
- At least one of the organometallic material gases supplied in the first period has substantially the same composition as the organometallic material gas supplied in the second period.
- the treatment in the first period and the treatment in the second period are suitable for continuous treatment.
- FIG. 1 is an overall configuration block diagram showing a semiconductor manufacturing apparatus according to an embodiment of the present invention.
- FIG. 2 is a fluid circuit diagram of a raw material supply unit of a semiconductor manufacturing apparatus.
- FIG. 3 is a control block diagram of a semiconductor manufacturing apparatus.
- FIG. 4] (a) to (e) are timing charts showing changes in the flow rates of various gases in the film formation process of the comparative example.
- FIG. 5 (a) to (e) are timing charts showing changes in flow rates of various gases in the film forming process of the embodiment.
- FIG. 6 is a schematic cross-sectional view showing a capacitor element in a semiconductor device.
- FIG. 7 is a schematic cross-sectional view showing FeRAM in a semiconductor device.
- FIG. 8 is a characteristic diagram showing the amount of element attached to the substrate by atmosphere before film formation.
- FIG. 9 is a characteristic diagram showing part of an XRD profile for the PZTZRu structure of the example and the PZTZRu structure of the comparative example.
- FIG. 10 is a schematic cross-sectional view showing the PZTZRu structure of the example and the PZTZRu structure of the comparative example side by side.
- FIG. 1 is a schematic configuration diagram showing the overall configuration of the semiconductor manufacturing apparatus 100 of the present embodiment.
- This semiconductor manufacturing apparatus 100 is a MOCVD apparatus equipped with a liquid material vaporization supply system that uses liquid organic metal or an organic metal solution as a liquid material and vaporizes and supplies the liquid material.
- the semiconductor manufacturing apparatus 100 includes a raw material supply unit 110, a vaporizer (liquid vaporization unit) 120, a processing unit 130, and an exhaust unit 140.
- the raw material supply unit 110 supplies a liquid material such as a liquid organic metal, an organic metal solution, or an organic solvent.
- the vaporizer (liquid vaporization unit) 120 vaporizes the liquid material supplied from the raw material supply unit 110 to generate gas.
- the processing unit 130 performs film formation based on the gas supplied from the vaporizer 120.
- the exhaust unit 140 exhausts the atmosphere of the vaporizer 120, the processing unit 130, and the raw material supply unit 110, respectively.
- FIG. 2 shows a fluid circuit of the raw material supply unit 110.
- Raw material supply unit 110 is a solvent supply unit, A material A material supply unit, a B material supply unit, and a C material supply unit.
- the solvent supply unit has a pressurized line Xa, a solvent container Xb, and a supply line 110X.
- the solvent container Xb stores an organic solvent having a predetermined component therein.
- the pressurization line Xa is provided between a supply source (not shown) of a pressurized inert gas (for example, compressed nitrogen gas) and the solvent container Xb, and introduces the pressurized inert gas into the solvent container Xb.
- the organic solvent is pumped from the solvent container Xb.
- an on-off valve 115 On the pressurization line Xa, an on-off valve 115, a pressure gauge P2, a check valve Xe, an on-off valve Xf, and an on-off valve Xg are installed.
- the supply line 110X is provided between the solvent container Xb and the main line (raw material supply line) 11 OS, and allows the organic solvent to flow from the solvent container Xb to the main line 110S.
- On / off valve Xh, on-off valve Xi, filter Xj, flow controller Xc and on-off valve Xd are attached to supply line 110X!
- the A material supply unit includes a pressurization line Aa, a raw material container Ab, and a supply line 110A.
- the raw material container Ab stores a liquid organic metal raw material or an organic metal raw material solution (hereinafter simply referred to as “raw material”).
- the pressurization line Aa is connected to the pressurization line Xa through a branch line Ya that branches downstream of the pressure gauge P2.
- a check valve Ae, an on-off valve Af, and an on-off valve Ag are attached to the pressurization line Aa.
- the supply line 110A is provided between the raw material container Ab and the main line 110S, and feeds the raw material to the raw material container Ab power main line 110S.
- an on-off valve Ah, an on-off valve Ai, a filter Aj, an on-off valve Ap, a flow rate controller Ac, and an on-off valve Ad are attached.
- the B material supply unit includes a pressurization line Ba, a raw material container Bb, and a supply line 110B.
- the raw material container Bb stores other raw materials.
- the pressurization line Ba is connected to the pressurization line Xa via a branch line Ya that branches downstream of the pressure gauge P2.
- a check valve Be, an on-off valve Bf, and an on-off valve Bg are attached to the pressurization line Ba.
- the supply line 110B is provided between the raw material container Bb and the main line 110S, and feeds the raw material from the raw material container Bb to the main line 110S.
- an on-off valve Bh, an on-off valve Bi, a filter Bj, an on-off valve Bp, a flow rate controller Be and an on-off valve Bd are attached.
- the C material supply unit includes a pressurization line Ca, a raw material container Cb, and a supply line 110C.
- the raw material container Cb stores other raw materials.
- the pressurization line Ca is connected to the pressurization line Xa via a branch line Ya that branches downstream of the pressure gauge P2.
- Pressure line C At a, a check valve Ce, an on-off valve Cf, and an on-off valve Cg are attached.
- the supply line 11 OC is provided between the raw material container Cb and the main line 110S, and feeds the raw material from the raw material container Cb to the main line 110S.
- Supply line 110C is provided with on-off valve Ch, on-off valve Ci, filter Cj, on-off valve Cp, flow controller Cc and on-off valve Cd.
- an organic solvent such as butyl acetate, octane, hexane, or THF (tetrahydrofuran) can be used as the organic solvent.
- organic Pb raw materials such as Pb (DPM) are used as raw materials supplied by the A material supply unit.
- organic Zr raw materials such as Zr (0—i—Pr) (DPM) or Zr (0—i—Pr) (DPM) or Zr (DPM) are used.
- the raw material supplied by the C material supply unit is Ti (0—i—Pr) (
- Organic Ti raw materials such as DPM
- organic Pb raw materials organic Zr raw materials
- organic Ti raw materials are all solid at room temperature and normal pressure, it is desirable to use them as solution raw materials that have been melted to a predetermined concentration by the above-mentioned organic solvent.
- Zr (Ot-Bu) Use liquid organic Zr raw material or liquid organic Ti raw material such as Ti (0—i-Pr)
- the present invention is not limited to the above raw materials.
- various organic metal materials such as an organic Ba raw material and an organic Sr raw material can be used as the raw material. Can do.
- the organometallic material may be liquid or solid at room temperature, but in this embodiment, a solution obtained by dissolving the organometallic material in an organic solvent such as butyl acetate is used. It was.
- the solvent supply unit, the A material supply unit, the B material supply unit, and the C material supply unit are respectively connected to the supply lines 110X, 11 OA, HOB, and 110C with on-off valves Xh, Ah, Bh, C h, on-off valve Xi, Ai, Bi, Ci ⁇ filter Xj, Aj, Bj, Cj, on-off valve Ap, Bp, Cp, mass flow meter and flow control valve Xc, Ac, Be, Cc, and open / close valves Xd, Ad, Bd, and Cd are provided in order toward the downstream side, and are connected to the raw material mixing unit 113.
- check valves Xe, Ae, Be, Ce, on-off valves Xf, Af, Bf, Cf, and on-off valves Xg, Ag, Bg, Cg are downstream in the pressurization lines Xa, Aa, Ba, Ca. It is provided in order toward the side.
- the on-off valves Xf, Af, Bf, Cf in the pressurization lines Xa, Aa, Ba, Ca are opened and closed.
- Apportionment between valves Xg, Ag, Bg, Cg and on-off valves Xi, Ai, Bi, Ci and on-off valves Xh, Ah, Bh, Ch Are connected via open / close valves Xk, Ak, Bk, Ck.
- the portions between the on-off valves Xi, Ai, Bi, Ci and the on-off valves Xh, Ah, Bh, Ch in the supply lines 110X, 11 OA, 1 10B, 110C are on-off valves XI, AI, BI, respectively.
- C1 is connected to the exhaust line 110D.
- the portion of the supply line 110X between the filter Xj and the flow rate controller Xc is connected to the pressurization lines Aa, Ba, Ca via the on-off valves Xm and An, Bn, Cn. Further, it is connected to the supply lines 110A, HOB, and 110C through the on-off valves Xm and Ao, Bo, and Co.
- the upstream portions of the pressurization lines Xa, Aa, Ba, and Ca are connected to each other and connected to a pressurization gas source such as an inert gas via an on-off valve 115.
- a pressure gauge P2 is connected to the downstream side of the on-off valve 115.
- the exhaust line 110D is connected to a no-pass line 116 and is connected to the raw material mixing section 113 via an on-off valve 117.
- the downstream end of the raw material mixing section 113 is connected to a main line 110S introduced into the vaporizer 120 via an on-off valve 114.
- the upstream end of the raw material mixing section 113 is connected to a carrier gas source such as an inert gas via an on-off valve 111 and a flow rate controller 112.
- a carrier gas source such as an inert gas
- the exhaust line 110D is connected to the drain tank D through the on-off valve 118, and this drain tank is connected to the raw material supply exhaust line 140C through the on-off valve 119.
- the vaporizer 120 includes a spray nozzle 121 to which a main line 110S derived from the raw material supply unit 110 and a spray gas line 120T for supplying a spray gas (for example, an inert gas) are connected.
- the spray nozzle 121 sprays the mist of the liquid material into the heated vaporizer 120 to vaporize the liquid material and generate a raw material gas.
- the vaporizer 120 is connected to the gas supply line 120S, and the gas supply line 120S is connected to the processing unit 130 via the gas introduction valve 131 !.
- a carrier supply line 130T for supplying a carrier gas such as an inert gas is connected to the gas supply line 120S, and the carrier gas can be introduced into the processing unit 130 together with the raw material gas through the gas supply line 130S.
- the carrier supply line 130T has a flow controller Ec and an open / close valve Ed. Therefore, the flow rate of the carrier gas can be controlled by the flow rate controller Ec.
- the oxidizing gas line 130V supplies an oxidizing gas such as O, O, N 0, NO to the processing unit 130.
- the acid gas line 130V is provided with a flow rate controller Fc and an on-off valve Fd, and the flow rate controller Fc can control the flow rate of the acid gas.
- a carrier gas supply line may be separately provided in addition to the 130V line. Although illustration is omitted, specifically, a carrier gas supply line for purging the acidic gas line connected to the downstream side portion of the acidic gas line 130V, a loading / unloading gate valve for the substrate W (Fig. And a carrier gas supply line for purging a shield plate (not shown) inside the chamber 132, and the like.
- the processing unit 130 includes a chamber 132 as a film forming chamber configured by an airtight sealed container.
- the chamber 132 includes a gas introduction unit 133 to which the gas lines 130S and 130V are connected.
- the gas introduction unit 133 includes a shower head structure that introduces the raw material gas and the oxidizing gas into the chamber 132 through fine holes.
- this single head structure is a post-mix type introduction structure in which the raw material gas and the oxidizing gas are introduced into the chamber 132 from the pores provided separately.
- a susceptor 134 is provided in the chamber 132 so as to be opposed to the gas introduction part 133, and the substrate W to be processed is placed on the susceptor 134.
- the susceptor 134 is heated by a heater or a light irradiation device (not shown) so that the substrate W can be set to a predetermined temperature.
- the pressure gauge P1 measures the pressure inside the chamber 132.
- the exhaust unit 140 includes a main exhaust line 140 A connected to the chamber 132.
- the main exhaust line 140A is provided with a pressure regulating valve 141, an on-off valve 142, an exhaust trap 143, an on-off valve 144, and an exhaust device 145 in this order from the upstream side.
- the pressure regulating valve 141 (automatic pressure regulating means) has a function to control the valve opening according to the detected pressure of the pressure gauge P1 and automatically adjust the internal pressure of the chamber 132 to the set value! .
- the exhaust section 140 is disposed between the gas supply line 120S and the main exhaust line 140A.
- a connected no-pass exhaust line 140B is provided.
- the upstream end of the binos exhaust line 140B is connected between the carburetor 120 and the gas introduction valve 131, and the downstream end thereof is connected between the exhaust trap 143 and the on-off valve 144.
- the bypass exhaust line 140B is sequentially provided with an on-off valve 146 and an exhaust trap 147 toward the downstream side.
- the exhaust unit 140 is provided with the raw material supply exhaust line 140C derived from the raw material supply unit 110.
- the raw material supply exhaust line 140C is connected between the on-off valve 144 of the main exhaust line 140A and the exhaust device 145.
- the exhaust device 145 is for exhausting the chamber 132, and preferably has a two-stage series configuration, for example, a first stage partial power-cal booster pump and a second stage part constituted by a dry pump.
- a main control unit 100X having an MPU (microprocessing unit), an operation unit 100P, an on-off valve control unit 100Y, a flow rate control unit 100Z, and a detection signal input unit 100W are provided.
- the operation unit 100P has an operation panel and a screen for performing various inputs to the main control unit 100X.
- the on-off valve control unit 100Y sends a signal for controlling the operation of the on-off valves 131, 146, Fd and the like based on an instruction from the main control unit 100X. Instead of opening / closing control of the on-off valve Fd, it may be determined whether the acidic gas is introduced into the processing unit 130 by controlling the flow rate of the flow rate controller Fc.
- the flow controller 100Z receives signals from the flow detector and transmits signals for controlling the operations of the flow controllers Xc, Ac, Be, Cc and the like.
- the detection signal input unit 100W receives a detection signal of sensor power not shown and transmits a detection value signal corresponding to the detection signal to the main control unit 100X.
- the flow rate controller 100Z is connected to the flow rate controllers Xc, Ac, Be, Cc, Ec, and Fc, and sets these flow rates.
- the flow rate detection values output from the flow rate controllers Xc, Ac, Be, Cc, Ec, and Fc are received, and the flow rate detection values are fed back to the flow rate control unit 100Z.
- the flow controllers Xc, Ac, Bc, Cc, Ec, and Fc may be controlled so as to match the set values.
- the flow controllers Xc, Ac, Be, and Cc can be configured by, for example, a flow detector such as an MFM (mass flow meter) and a flow regulating valve such as a high-precision variable flow valve.
- the step of forming the dielectric layer made of the metal oxide on the substrate (metal layer) by reacting the source gas of the organic metal material and the acidic gas. is included.
- This step is performed by the semiconductor manufacturing apparatus 100 described above.
- the dielectric layer a high dielectric layer or a ferroelectric layer can be used depending on the application.
- the ferroelectric layer is preferably a polycrystalline thin film having a perovskite structure such as PZT or a polycrystalline thin film having a layered structure such as SBT.
- the entire apparatus can be automatically operated by executing an operation program in the control unit 100X shown in FIG.
- the operation program is stored in advance in the internal memory of the MPU, and this operation program is read from the internal memory and executed by the CPU.
- the operation program has various operation parameters, and that the operation parameters can be appropriately set by an input operation from the operation unit 100P.
- FIG. 5 is a timing chart showing the operation timing of each part of the semiconductor manufacturing apparatus 100.
- FIG. 5 (a) shows the flow rate of the solvent supplied through the supply line 110X. This solvent flow rate is controlled by the flow controller Xc.
- FIG. 5 (b) shows the raw material flow rate (bypass), and FIG. 5 (c) shows the raw material flow rate (chamber).
- the raw material flow rate (bypass) corresponds to the flow rate of the raw material gas vaporized by the vaporizer 120 and flowing through the bypass exhaust line 140B.
- the raw material flow rate (chamber) corresponds to the flow rate through the raw material gas supply line 130S.
- These raw material flow rates (bypass) and raw material flow rates (chambers) are the total flow rate of the raw materials supplied via the supply lines 110A, HOB, and 110C, and are controlled by the flow controllers Ac, Be, and Cc.
- FIG. 5 shows the oxidant flow rate.
- the oxidant flow rate corresponds to the flow rate of the acidic gas flowing through the acidic gas line 130V.
- Fig. 5 (e) shows the inert gas flow rate.
- the inert gas flow rate corresponds to the total flow rate of inert gas such as nitrogen gas flowing through all carrier gas supply lines including the carrier supply line 130T.
- each flow rate of (a) to (e) in FIG. 5 is indicated by a different flow rate scale.
- the flow state and vaporization state of the air heater 120 are mainly stabilized.
- the solvent flow rate was 1.2 mlZmin (200 sccm in terms of gas), and the total flow rate of the inert gas was 1200 sccm.
- the flow rate of the carrier gas supplied to the raw material mixing unit 113 of the raw material supply unit 110 is, for example, 200 sccm, and the flow rate of the spray gas supplied to the vaporizer 120 is 50 sccm.
- the flow rates of the carrier gas and the spray gas are not limited to the standby period tl to t2, but are always constant in order to maintain the spray state of the vaporizer 120. Also, during the standby period tl to t2, the liquid raw material is supplied, so that the raw material gas is generated in the vaporizer 120!
- the waiting period tl to t2 is preferably set to about 20 to 40 seconds, for example.
- the liquid raw material is flowed as shown in the raw material flow rate (bypass) (Fig. 5 (b)), the solvent flow rate is decreased (Fig. 5 (a)), and the inert gas is further flown. (Fig. 5 (e)).
- the liquid material was 0.5 mlZmin
- the solvent flow rate was 0.7 mlZmin
- the inert gas flow rate was 2900 sccm.
- the preflow period t2 to t3 since the liquid raw material is supplied as described above, the raw material and the solvent are vaporized in the vaporizer 120, and the raw material gas is generated.
- the source gas is exhausted via the bypass exhaust line 140B.
- the source gas can be supplied into the chamber 132 at a stable flow rate in the next preceding period t3 to t4 and the film formation period t4 to t5.
- the preflow period t2 to t3 is preferably set to about 30 to 150 seconds, for example.
- the substrate W is heated on the acceptor 134 and set to a predetermined temperature, and the chamber 132 is exhausted by the exhaust device 145.
- a predetermined pressure is set.
- the temperature of the substrate W during the film formation period t4 to t5 is set to 500 to 650 ° C, preferably about 600 to 630 ° C. Determined.
- the internal pressure of the chamber 132 during the film formation period t4 to t5 is preferably in the range of 50 Pa to 5 kPa, and most preferably about 533.3 Pa.
- the gas introduction valve 131 is opened and the on-off valve 146 is closed as shown in (c) Raw material flow rate (chamber).
- the source gas is introduced into the chamber 132.
- the source gas is introduced together with the organic solvent gas.
- the acidic gas is not supplied.
- the flow rate of the inert gas supplied through the carrier supply line 130T is reduced, and the total gas flow rate introduced into the chamber 132 is substantially reduced. It is preferable to adjust so as not to change. For example, when the flow rate of the source gas introduced into the chamber 1 32 is 0.5 mlZmin and the flow rate of the solvent is 0.7 mlZmin, the flow rate of the inert gas is reduced by a corresponding amount of 200 sccm.
- the preceding period t3 to t4 since the oxidant is not supplied, the raw material molecules are uniformly adsorbed on the surface of the substrate W, thereby suppressing the influence of the base. It is preferable that the preceding period t3 to t4 is continued until the source gas is uniformly and stably supplied onto the substrate in the chamber 132, for example, set to about 10 to 60 seconds. It is desirable that
- an acidic gas is introduced into the chamber 132 as shown in (d) of FIG. Start film formation for.
- the source molecules exist on the substrate surface, a uniform and flat film formation state can be obtained.
- the source gas and the acidic gas react to form a dielectric layer on the substrate W.
- This film formation period t4 to t5 depends on the type of source gas and oxidizing gas, the composition of the dielectric layer, the film formation temperature (the temperature of the substrate W during film formation), the thickness of the dielectric layer, etc. Normally, it is set in the range of 100 to 500 seconds.
- the gas introduction valve 131 is closed, the on-off valve 146 is opened, and the process proceeds to the post-purge period t5 to t6 after film formation. . Further, at timing t6, as shown in FIG. 5 (d), the supply of the acidic gas is stopped, and the process proceeds to a waiting period t6 to t7 in which only the inert gas is purged. It is preferable that the raw material gas flow rate in the preceding period t3 to t4 is the same as the raw material gas flow rate in the film formation period t4 to t5.
- the oxidizing gas is continuously introduced in order to prevent the dielectric layer (PZT) from being deteriorated, and the oxidizing atmosphere in the chamber 132 is maintained.
- the processing in the post-purge period t5 to t6 is different from the processing in the preflow period t2 to t3 in that the oxidizing gas is continuously supplied.
- the reason for this is that, generally, a ferroelectric material having a bottom bumskite structure is greatly deteriorated in dielectric properties due to oxygen desorption when placed in a high-temperature reducing atmosphere.
- the introduction of the acidic gas during the post-purge period t5 to t6 after the film formation prevents the inside of the chamber 132 from becoming a reducing atmosphere, and conversely the inside of the chamber 132.
- an oxidizing atmosphere it is possible to completely prevent the deterioration of the ferroelectric characteristics.
- a plurality of film forming processes are sequentially repeated by repeating the processes of preflow period ⁇ preceding period ⁇ film forming period ⁇ post purge period.
- the operation timing of each unit as described above may be set in advance in the control unit 100X, or may be configured as appropriate by an operation on the operation unit 100P. If the operation timing is set, the control unit 100X automatically controls the entire apparatus via the on-off valve control unit 100Y and the flow rate control unit 100Z, and the above operation procedure is executed.
- the above apparatus is a method similar to the conventional method.
- a comparative example when operated in Fig. 4 will be described with reference to Fig. 4.
- description of the part which a comparative example overlaps with said Example is abbreviate
- the oxidant flow rate and (e) the inert gas flow rate in FIG. 4 are different from those in the above example.
- the introduction of the oxygen-containing gas into the chamber 132 is started at the timing 12 when the standby period tl 1 to tl2 shifts to the preflow period tl2 to tl3 ((d) in FIG. 4), and the raw material flow rate (bypass)
- the source gas at the source flow rate (chamber) is supplied to the chamber 132 to perform film formation ((c) in FIG. 4).
- the surface of the substrate W is oxidized by the oxidizing agent.
- the interface of the underlayer Z film formation layer has an adverse effect (such as surface oxidation) and degrades the film quality of the film formation layer.
- FIG. 6 is a schematic cross-sectional view showing the capacitive element formed by the manufacturing method according to the present embodiment.
- a SiO insulating film 12 is formed on the silicon substrate 11. On this insulating film 12, there are burrs.
- a lower electrode 13 made of a metal layer such as Ir or Ru is formed through the upper layer 12b.
- the lower electrode 13 can be formed by, for example, a sputtering method using a metal target such as Ir or Ru.
- a dielectric layer 14 made of PZT, BST or the like is formed on the lower electrode 13 by the MOCVD method using the above apparatus.
- the dielectric layer 14 is made of a metal oxide having a perovskite structure formed by reacting an organometallic material gas and an oxidizing gas by the method of the above-described embodiment.
- an upper electrode 15 having a force such as Pt, Ir or IrO is formed by a sputtering method.
- the laminated structure of the lower electrode 13, the dielectric layer 14, and the upper electrode 15 constitutes the capacitive element Cp.
- the capacitive element Cp is formed as a part of the semiconductor device 10 having the substrate 11 and the circuit structure thereon.
- an adhesion layer that also becomes Ta or T and a barrier layer 12b that also has Ta N or TiN force between the lower electrode 13 that also has metal layer force such as u.
- FIG. 7 is a schematic cross-sectional view showing the semiconductor device 10 having FeRAM on the substrate 11.
- the FeRAM memory is formed in the same way as when forming a normal MOS transistor.
- Cell transistors (l is, l lf, l id, l lx) are formed. That is, the element isolation structure is configured by partially removing the surface of the substrate 11 to form the element isolation film llx. Next, an impurity is implanted into a part of the element region isolated by this element isolation structure to form a source region 1 Is and a drain region 1 Id, and a gate insulating film 11 f is formed on the region between them. Through this, a gate electrode l lg (word line) is formed.
- the first interlayer insulating film 1 li is formed on the gate electrode l lg, and the wiring (bit line) 1 lp is conducted to the source region 1 Is through the contact hole provided in the first interlayer insulating film 1 li. Connect.
- a second interlayer insulating film 12 is further formed on the wiring l ip, and then a lower electrode 13 similar to that shown in FIG. 6 is formed.
- the lower electrode 13 is conductively connected to the drain region 1 Id through a contact hole provided in the second interlayer insulating film 12 and the first interlayer insulating film 1 li.
- a dielectric layer 14 and an upper electrode 15 are laminated on the lower electrode 13 in the same manner as described above, and a capacitive element Cp similar to the above is obtained.
- the semiconductor device 10 including the capacitive element Cp as a ferroelectric memory cell (FeRAM) is obtained.
- the acidic gas when the acidic gas is first introduced into the chamber 132 without flowing the organometallic material gas, the acidic gas comes into contact with the substrate W at a high temperature.
- the substrate surface of the substrate W is the surface of a metal layer such as Ir or Ru, the surface is partially oxidized.
- the acidity at this time is determined by the acidity of the acidic gas introduced into the chamber 132, the partial pressure of the oxidizing gas, the substrate temperature, the material of the metal layer, etc. Complete and reproducible!
- Fig. 8 is a characteristic diagram showing the results of experiments conducted using an apparatus that has been used to deposit PZT in the past.
- a substrate W formed by forming a metal layer such as Ir or Ru on a silicon substrate via an insulating film is disposed in the chamber 132, and a pressure of 533 is introduced while introducing a predetermined gas into the chamber 132. After evacuating to 3 Pa, the substrate W was heated for 300 seconds at a set temperature of 625 ° C.
- the substrate W thus treated was analyzed with an X-ray fluorescence analyzer, and the amounts of elements of Pb, Zr and Ti adhering to the surface of the substrate W were determined.
- the diamonds in Fig. 8 The result of introducing only the inert gas into the bar 132 is shown, and the square mark indicates that the acidic gas (O) is introduced into the chamber 132 together with the inert gas so as to have the same partial pressure as the preparation period of the above comparative example.
- the triangle mark shows the result of introducing the same amount of solvent into the chamber 132 together with the inert gas in the waiting period.
- the substrate W is formed by forming a PZT thin film on the metal layer by using the above-described apparatus on the metal layer using the substrate W formed by forming a metal layer of Ru et al.
- Figure 9 shows a part of the surface X-ray diffraction (XRD) spectrum.
- the solid line in the figure shows the result of the PZT thin film formed by the method of the comparative example, and the broken line shows the result of the PZT thin film formed by the method of the above example.
- C in the figure shows diffraction peaks due to the (110) plane and (101) plane of PZT
- D in the figure shows diffraction peaks due to the (100) plane of PZT.
- FIG. 10 is a cross-sectional view schematically showing the surface roughness of the PZT dielectric layers of the comparative example and the example of FIG.
- the left half area of Fig. 10 shows a comparative example, and the right half area shows an example.
- the thickness of the Ru metal layer (lower electrode) is about 130 ⁇ m
- the thickness of the PZT dielectric layer is about lOOnm. From this figure, it can be seen that in the example, the surface roughness of the PZ T dielectric layer is significantly improved compared to that of the comparative example.
- the interface state with the upper electrode is expected to be stabilized, and the electrical characteristics of the capacitive element (for example, reduction of leakage current) ) Can be improved, and effects such as easy post-processing such as etching can be expected.
- an improvement in the morphology of the surface of the dielectric layer can also be expected to be able to easily perform in-film particle measurement.
- a ferroelectric layer such as PZT is formed by the MOCVD method
- the facet that appears on the crystal surface grows as PZT grows, making it difficult to flatten the surface morphology.
- the laser beam is irradiated onto the substrate surface and the number of particles is counted by detecting the laser scattered light from the particles.
- the surface morphology of the PZT ferroelectric layer is poor.
- it is difficult to determine whether the scattered laser light is caused by particles and whether it is caused by facets on the surface of the PZT crystal.
- the dielectric layer (ferroelectric layer) made of the metal oxide (polycrystal) having the perovskite structure is formed as described above has been described.
- a polycrystalline thin film having another orientation state or an amorphous thin film may be formed, which is not the case with a bevelskite structure exhibiting ferroelectric characteristics. These are not excluded. Even these thin films are effective as dielectrics or insulators, and amorphous thin films are heat-treated after film formation. Can be polycrystallized.
- the raw material is supplied in a state where no acidic gas is supplied immediately before the film formation period t4 to t5 in which the dielectric layer is formed by the reaction of the raw material gas and the oxidizing gas.
- the substrate is placed in a reducing atmosphere during the preceding period t3 to t4. If you are deceived, you will never lose it.
- the organometallic material gas that flows in the preceding periods t3 to t4 is not necessarily the same as the source gas.
- the source gas in which three types of organometallic material gases are mixed is formed into a film.
- at least one kind of organometallic material gas among these three kinds may be supplied.
- film formation is performed by flowing the same source gas as the film formation period t4 to t5 in the preceding period t3 to t4.
- the source gas partial pressure in the initial period of the deposition period t4 to t5 It is possible to eliminate changes and to start film formation stably.
- the preceding periods t3 to t4 are provided immediately before the film forming periods t4 to t5. .
- the raw material gas is introduced into the chamber 132 in a state where no acidic gas is introduced, and the raw material gas and the acid are continuously introduced in the film formation period t4 to t5.
- the inert gas By introducing the inert gas into the chamber 132, the surface state of the base surface is prevented from becoming uncontrollable.
- the vaporized gas of the organic solvent is introduced in a state where the acidic gas is not introduced, but the organometallic material gas may not be introduced.
- the raw material molecules do not adhere to the substrate surface, but since the film formation can be started in a clean state without oxidizing the substrate surface, the controllability of the base surface can be ensured. As a result, it is possible to improve the homogeneity and surface morphology of the formed thin film.
- a first period is provided in which the vaporized gas of the organic solvent is introduced but the organometallic material gas is not introduced in a state where the oxidizing gas is not introduced.
- a second period for introducing the source gas may be provided in a state where the oxidizing gas is not introduced, and the film formation period may be started following this second period. . Even in this case, the cleanliness of the substrate surface is maintained in the first period, and the raw material molecules uniformly adhere to the substrate surface in the second period, so that the same effect as in the above embodiment can be obtained.
- a part of the plurality of organometallic material gases is introduced in a state where the oxygen-containing gas is not introduced, and the subsequent second period.
- all organometallic material gases are introduced in a state where no acidic gas is introduced, and immediately after that, the acidic gas is introduced in the same raw material gas introduction state as in the second period. It is possible to start the film formation by introducing a new one.
- the vaporized gas of the organic solvent and the source gas are selectively supplied to the film formation chamber.
- a gas supply system that can introduce only the vaporized gas of the organic solvent is provided in parallel. It is preferable to provide it. Accordingly, switching between the preceding period t3 to t4 and the film forming period t4 to t5, or between the first period, the second period, and the film forming period t4 to t5 only by operating the valve of the supply system.
- ferroelectric PZT is formed as a dielectric layer
- ferroelectrics with elements such as La, Ca and Nb added to PZT and ferroelectrics such as PbTiO, SrBi Ta O, BiLaTiO
- the acidic gas before the film-forming step, the acidic gas is not supplied in a state where at least part of the organometallic material gas is not accompanied to the metal layer. Therefore, the surface of the metal layer is incompletely oxidized and deposits hardly adhere to the surface of the metal layer due to the acidic gas.
- the metal oxide film does not intervene between the metal layer and the dielectric layer, the stability and reproducibility of the interface state is ensured, and the film quality of the dielectric layer and the reproducibility thereof are improved. As a result, the electrical characteristics of the capacitive element can be improved, and the surface of the dielectric layer can be smoothed.
- the capacitive element manufacturing method, the semiconductor device manufacturing method, and the semiconductor manufacturing device of the present invention are not limited to the above-described illustrated examples, and do not depart from the gist of the present invention. Of course, various changes can be obtained.
Abstract
Description
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JP5719849B2 (ja) * | 2010-09-21 | 2015-05-20 | 株式会社アルバック | 薄膜製造方法 |
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JP5461786B2 (ja) | 2008-04-01 | 2014-04-02 | 株式会社フジキン | 気化器を備えたガス供給装置 |
US8659124B2 (en) * | 2008-12-29 | 2014-02-25 | Nxp B.V. | Physical structure for use in a physical unclonable function |
JP5720406B2 (ja) * | 2011-05-10 | 2015-05-20 | 東京エレクトロン株式会社 | ガス供給装置、熱処理装置、ガス供給方法及び熱処理方法 |
JP6047308B2 (ja) * | 2012-05-28 | 2016-12-21 | 日精エー・エス・ビー機械株式会社 | 樹脂容器用コーティング装置 |
KR102358566B1 (ko) * | 2015-08-04 | 2022-02-04 | 삼성전자주식회사 | 물질막 형성 방법 |
CN110473780B (zh) * | 2019-08-30 | 2021-12-10 | 上海华力微电子有限公司 | 改善栅极氧化层的方法及半导体器件的制造方法 |
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JPH06275548A (ja) * | 1993-01-25 | 1994-09-30 | Osaka Gas Co Ltd | Cvd薄膜形成方法 |
JP2004281762A (ja) * | 2003-03-17 | 2004-10-07 | Seiko Epson Corp | 強誘電体薄膜の形成方法 |
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JP4573009B2 (ja) * | 2000-08-09 | 2010-11-04 | 日本電気株式会社 | 金属酸化物誘電体膜の気相成長方法 |
US6635497B2 (en) * | 2001-12-21 | 2003-10-21 | Texas Instruments Incorporated | Methods of preventing reduction of IrOx during PZT formation by metalorganic chemical vapor deposition or other processing |
JP3891848B2 (ja) * | 2002-01-17 | 2007-03-14 | 東京エレクトロン株式会社 | 処理装置および処理方法 |
JP3931683B2 (ja) * | 2002-01-21 | 2007-06-20 | 株式会社高純度化学研究所 | 化学気相成長法によるpzt薄膜の製造方法 |
KR20040059436A (ko) * | 2002-12-30 | 2004-07-05 | 주식회사 하이닉스반도체 | 강유전체 메모리 소자의 제조 방법 |
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- 2006-01-12 KR KR1020097021694A patent/KR20090125827A/ko not_active Application Discontinuation
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Patent Citations (2)
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JPH06275548A (ja) * | 1993-01-25 | 1994-09-30 | Osaka Gas Co Ltd | Cvd薄膜形成方法 |
JP2004281762A (ja) * | 2003-03-17 | 2004-10-07 | Seiko Epson Corp | 強誘電体薄膜の形成方法 |
Cited By (1)
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JP5719849B2 (ja) * | 2010-09-21 | 2015-05-20 | 株式会社アルバック | 薄膜製造方法 |
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KR20090125827A (ko) | 2009-12-07 |
KR100945096B1 (ko) | 2010-03-02 |
US20070287248A1 (en) | 2007-12-13 |
KR20070099643A (ko) | 2007-10-09 |
CN101116183A (zh) | 2008-01-30 |
JP2006222136A (ja) | 2006-08-24 |
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