WO2007077598A1 - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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- WO2007077598A1 WO2007077598A1 PCT/JP2005/024059 JP2005024059W WO2007077598A1 WO 2007077598 A1 WO2007077598 A1 WO 2007077598A1 JP 2005024059 W JP2005024059 W JP 2005024059W WO 2007077598 A1 WO2007077598 A1 WO 2007077598A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L28/57—Capacitors with a dielectric comprising a perovskite structure material comprising a barrier layer to prevent diffusion of hydrogen or oxygen
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76829—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
-
- 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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76838—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B53/00—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors
- H10B53/40—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors characterised by the peripheral circuit region
Definitions
- the present invention relates to a semiconductor device suitable for a nonvolatile memory having a ferroelectric capacitor and a method for manufacturing the same.
- Ferroelectric memory in which information is held in a ferroelectric capacitor by using polarization inversion of a ferroelectric has been developed.
- Ferroelectric memory is a non-volatile memory in which retained information is not lost even when the power is turned off, and has attracted particular attention because it can achieve high integration, high speed drive, high durability, and low power consumption.
- a perovskite crystal structure such as a PZT (Pb (Zr, Ti) 0) film and an SBT (SrBiTaO) film having a large residual polarization is used.
- Ferroelectric oxides are mainly used.
- the remanent polarization of the PZT film is about 10-30 C Zcm 2 .
- the properties of ferroelectric films (such as remanent polarization and dielectric constant) are easily degraded by moisture.
- Ferroelectric memory uses a silicon oxide film that has a high affinity for water as an interlayer insulating film.
- heat treatment is applied to the interlayer insulating film and metal wiring. Is done.
- Moisture that enters from the outside and exists in the interlayer insulating film is decomposed into hydrogen and oxygen during the heat treatment, and hydrogen reacts with oxygen atoms in the ferroelectric film.
- oxygen defects are generated in the ferroelectric film, the crystallinity is lowered, and the characteristics are deteriorated. The same phenomenon occurs even when the ferroelectric memory is used for a long time.
- Such degradation of characteristics due to moisture intrusion and hydrogen diffusion may occur in other elements such as a transistor in a semiconductor device other than just a ferroelectric capacitor.
- an aluminum oxide film has been formed above the ferroelectric capacitor for the purpose of preventing moisture intrusion and hydrogen diffusion.
- a technique for forming an aluminum oxide film so as to directly enclose a ferroelectric capacitor there is a technique for forming an aluminum oxide film above the wiring layer located above the ferroelectric capacitor.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-197878
- Patent Document 2 JP 2001-68639 A
- Patent Document 3 Japanese Patent Laid-Open No. 2003-174145
- Patent Document 4 Japanese Patent Laid-Open No. 2002-176149
- Patent Document 5 Japanese Unexamined Patent Publication No. 2003-100994
- An object of the present invention is to provide a semiconductor device capable of sufficiently securing the characteristics of a ferroelectric capacitor and a method for manufacturing the same.
- a semiconductor device may be provided with a ferroelectric capacitor formed above a semiconductor substrate and provided with a lower electrode, a strong dielectric film, and an upper electrode.
- a first wiring having a part connected to at least one of the upper electrode or the lower electrode is formed above the ferroelectric capacitor.
- a barrier layer having a flat surface that directly covers the first wiring and prevents diffusion of hydrogen or moisture is provided.
- An interlayer insulating film is formed on the barrier layer.
- a second wiring part of which is connected to the first wiring is formed on the interlayer insulating film.
- the ferroelectric capacitor is formed above the ferroelectric capacitor.
- a barrier layer having a flat surface that directly covers the first wiring and prevents diffusion of hydrogen or moisture is formed.
- an interlayer insulating film is formed on the barrier layer.
- a second wiring part of which is connected to the first wiring is formed on the interlayer insulating film.
- FIG. 1 is a cross-sectional view showing the structure of a ferroelectric memory (semiconductor device) according to a reference example.
- FIG. 2A shows a ferroelectric memory according to the first embodiment of the present invention.
- FIG. 2B is a cross-sectional view showing the ferroelectric memory according to the first embodiment of the present invention.
- FIG. 3A is a plan view showing the ferroelectric memory according to the first embodiment of the present invention. It is sectional drawing which shows the manufacturing method of a dielectric memory.
- FIG. 3B is a cross-sectional view showing the manufacturing method of the ferroelectric memory, following FIG. 3A.
- FIG. 3C is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3B.
- FIG. 3D is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3C.
- FIG. 3E is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3D.
- FIG. 3F is a cross-sectional view showing the manufacturing method of the ferroelectric memory, following FIG. 3E.
- FIG. 3G is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3F.
- FIG. 3H is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3G.
- FIG. 31 is a cross-sectional view showing the manufacturing method of the ferroelectric memory, following FIG. 3H.
- FIG. 3J is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 31.
- FIG. 3K is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3J.
- FIG. 3L is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3K.
- FIG. 3M is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3L.
- FIG. 3N is a cross-sectional view showing the manufacturing method of the ferroelectric memory, following FIG. 3M.
- FIG. 30 is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3N.
- FIG. 3P is a cross-sectional view showing the manufacturing method of the ferroelectric memory, following FIG. 30.
- FIG. 3Q is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3P.
- FIG. 3R is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3Q.
- FIG. 3S is a cross-sectional view showing the manufacturing method of the ferroelectric memory, following FIG. 3R.
- FIG. 3T is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3S.
- FIG. 3U is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3T.
- FIG. 3V is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3U.
- FIG. 3W is a cross-sectional view showing the manufacturing method of the ferroelectric memory following FIG. 3V.
- FIG. 3X is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3W.
- FIG. 3Y is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 3X.
- FIG. 4 is a cross-sectional view showing a method for manufacturing a ferroelectric memory, following FIG. 3Q, the same as FIG. 3R.
- FIG. 5A is a diagram showing a moisture release route in the first embodiment.
- FIG. 5B is a diagram showing a water release route in a reference example.
- FIG. 6A is a cross-sectional view showing the method of manufacturing a ferroelectric memory according to the second embodiment of the present invention.
- FIG. 6B is a cross-sectional view showing a method for manufacturing the ferroelectric memory, following FIG. 6A.
- FIG. 7 is a cross-sectional view showing a ferroelectric memory according to a second embodiment of the present invention.
- FIG. 8 is a cross-sectional view showing a ferroelectric memory according to a third embodiment of the present invention.
- FIG. 9 is a cross-sectional view showing a ferroelectric memory according to a fourth embodiment of the present invention.
- FIG. 1 is a cross-sectional view showing the structure of a ferroelectric memory (semiconductor device) according to a reference example.
- an element isolation region 1012 that defines an element region is formed on a semiconductor substrate 1010 such as a silicon substrate.
- the tools 1014a and 1014b are formed in the element region defined by the element isolation region 1012.
- a gate electrode (gate arrangement) is formed on the wells 1014a and 1014b with a gate insulating film 1016 interposed therebetween.
- Line) 1018 is formed.
- the gate electrode 1018 has, for example, a polycide structure in which a metal silicide film such as a tungsten silicide film is stacked on a polysilicon film.
- An insulating film 1019 such as a silicon oxide film is formed on the gate electrode 1018.
- Sidewall insulating film 1020 is formed on the side of gate electrode 1018 and insulating film 1019.
- a source Z drain diffusion layer 1022 is formed on the surfaces of the wells 1014a and 1014b so as to sandwich the gate electrode 1018 in plan view.
- the transistor 1024 having the gate electrode 1018 and the source Z drain diffusion layer 1022 is formed.
- the gate length of the transistor 1024 is 0.35 111 or 0.11 to 0.18 m in the f column.
- a SiON film 1025 and a silicon oxide film 1026 covering the transistor 1024 are sequentially stacked.
- the thickness of the SiON film 1025 is, for example, 200 nm, and the thickness of the silicon oxide film 26 is, for example, 600 nm.
- An interlayer insulating film 1027 is composed of the SiON film 1025 and the silicon oxide film 1026. The surface of the interlayer insulating film 1027 is planarized.
- a silicon oxide film 1034 having a film thickness of lOOnm is formed on the interlayer insulating film 1027. Since it is formed on the planarized interlayer insulating film 1027, the silicon oxide film 1034 is also flat.
- a lower electrode 1036 is formed on the silicon oxide film 1034.
- the lower electrode 1036 is composed of, for example, an aluminum oxide film 1036a having a thickness of 20 to 50 nm and a Pt film 1036b having a thickness of 100 to 200 nm laminated thereon.
- a ferroelectric film 1038 is formed on the lower electrode 1036.
- the ferroelectric film 1038 for example, a PbZrTiO film (PZT film) having a film thickness of 100 to 250 nm is used.
- the upper electrode 1040 is formed on the ferroelectric film 1038.
- the upper electrode 1040 includes, for example, an IrO film 1040a having a thickness of 25 to 75 nm and a thickness of 150 to 25 laminated thereon.
- Y is set higher than the oxygen composition ratio X of the IrO film 1040a.
- Ferroelectric capacitor 1 from lower electrode 1036, ferroelectric film 1038 and upper electrode 4010
- 042 is configured.
- Barrier film 1044 so as to cover the upper surface and side surfaces of ferroelectric film 1038 and upper electrode 1040 Is formed.
- As the noria film 1044 for example, an aluminum oxide (Al 2 O 3) film having a thickness of 20 to LOONm is used.
- the barrier film 1044 is a film having a function of preventing diffusion of hydrogen and moisture.
- the metal oxide constituting the ferroelectric film 1038 is reduced by hydrogen or moisture, and the electrical characteristics of the ferroelectric capacitor 1042 are deteriorated.
- the barrier film 1044 so as to cover the upper surface and the side surface of the ferroelectric film 1038 and the upper electrode 1040, hydrogen and moisture are prevented from reaching the ferroelectric film 1038. It becomes possible to suppress deterioration of electrical characteristics.
- a barrier film 1046 is formed to cover the barrier film 1044 and the ferroelectric capacitor 1042.
- the Noria film 1046 for example, an aluminum oxide film having a film thickness of 20 to: LOOnm is used.
- the noria film 1046 is a film having a function of preventing diffusion of hydrogen and moisture, like the noria film 1044.
- An interlayer insulating film 1048 such as a silicon oxide film having a thickness of 1500 nm is formed on the noria film 1046, for example.
- the surface of the interlayer insulating film 1048 is planarized.
- Contact holes 1050 a and 1050 b reaching source Z drain diffusion layer 1022 are formed in interlayer insulating film 1048, barrier film 1046, silicon oxide film 1034 and interlayer insulating film 1027. Further, a contact hole 52a reaching the upper electrode 1040 is formed in the interlayer insulating film 1048, the noria film 1046, and the barrier film 1044. Further, a contact hole 1052 b reaching the lower electrode 1036 is formed in the interlayer insulating film 1048, the noria film 1046, and the barrier film 1044.
- a barrier metal film (not shown) is formed in the contact holes 1050a and 1050b.
- This noria metal film is composed of, for example, a Ti film with a thickness of 20 nm and a TiN film with a thickness of 50 nm formed thereon.
- the Ti film is formed to reduce contact resistance, and the TiN film is formed to prevent diffusion of tungsten, which is a conductor plug material.
- the barrier metal film formed in each of the contact holes described later is also formed for the same purpose.
- a wiring 1056a electrically connected to the conductor plug 1054a and the upper electrode 1040 is formed on the interlayer insulating film 1048 and in the contact hole 1052a.
- a wiring 1056b electrically connected to the lower electrode 1036 is formed over the interlayer insulating film 1048 and in the contact hole 1052b.
- a wiring 1056c electrically connected to the conductor plug 1054b is formed on the interlayer insulating film 1048.
- Wirings 1056a, 1056b and 1056c are, for example, a TiN film having a thickness of 150 nm, an AlCu alloy film having a thickness of 550 nm formed thereon, and a film formed thereon A Ti film with a thickness of 5 nm and a TiN film with a thickness of 150 nm formed on it are also configured.
- the source Z drain diffusion layer 1022 of the transistor 1024 and the upper electrode 1040 of the ferroelectric capacitor 1042 are electrically connected to each other through the force conductor plug 1054a and the wiring 1056a, and one transistor 1024 and one transistor
- An Fe RAM 1T1C type memory cell having a ferroelectric capacitor 1042 is formed.
- the memory cells are arranged in the memory cell region of the Fe RAM chip.
- a barrier film 1058 is formed to cover the upper and side surfaces of the wirings 1056a, 1056b and 1056c.
- the noria film 1058 for example, an aluminum oxide film having a thickness of 20 nm is used.
- the noria film 1058 is a film having a function of preventing the diffusion of hydrogen and moisture, like the noria films 1044 and 1046.
- the noria film 1058 is also used to suppress plasma damage.
- the surface of the silicon oxide film 1060 is flattened.
- the thickness of the silicon oxide film 60 on the wirings 1056a, 1056b and 1056c is, for example, lOOOnm.
- a silicon oxide film 1061 having a film thickness of lOOnm is formed on the silicon oxide film 1060. Since the silicon oxide film 1061 is formed on the flat silicon oxide film 1060, the silicon oxide film 1061 is also flat.
- a noria film 1062 is formed on the silicon oxide film 1061.
- the noria film 1062 for example, an aluminum oxide film having a thickness of 20 to 70 nm is used. Flat silico Since the oxide film 1061 is formed, the barrier film 1062 is also flat.
- the noria film 1062 is a film having a function of preventing diffusion of hydrogen and moisture. Further, since the noria film 1062 is flat, it is formed with extremely good coverage (coverability) as compared with the noria films 1044, 1046, and 1058. Therefore, the diffusion of hydrogen and moisture can be prevented more reliably.
- the barrier film 1062 is formed not only on the memory cell region of the FeRAM chip on which a plurality of memory cells having the ferroelectric capacitor 1042 are arranged, but also on the entire surface of the FeRAM chip including the peripheral circuit region.
- An interlayer insulating film 1066 is composed of the noria film 1058, the silicon oxide film 1060, the silicon oxide film 1061, the noria film 1062, and the silicon oxide film 1064.
- a contact hole 1068 reaching the wiring 1056c is formed in the interlayer insulating film 1066.
- a rare metal film (not shown) is formed in the contact hole 1068.
- This barrier metal film is composed of, for example, a Ti film with a thickness of 20 nm and a TiN film with a thickness of 50 nm formed thereon.
- the barrier metal film may be composed of only the TiN film without forming the Ti film.
- a wiring 1072a is formed on the interlayer insulating film 1066. Further, a wiring 1072b electrically connected to the conductor plug 1070 is formed on the interlayer insulating film 1066.
- Wirings 1072a and 1072b are, for example, a TiN film with a film thickness of 50 nm, an AlCu alloy film with a film thickness of 500 nm formed thereon, and a film thickness formed thereon. Is composed of a Ti film with a thickness of 150 nm and a Ti film with a thickness of 150 nm.
- a silicon oxide film 1074 is formed to cover the wirings 1072a and 1072b.
- the thickness of the silicon oxide film 1074 is, for example, 2200 nm.
- the surface of the silicon oxide film 1074 is planarized.
- a silicon oxide film 1076 having a film thickness of lOOnm is formed on the silicon oxide film 1074. Since the silicon oxide film 1074 is formed on the flattened silicon oxide film 1074, the silicon oxide film 1076 is also flat.
- a noria film 1078 is formed on the silicon oxide film 1076.
- the noria film 1078 for example, an aluminum oxide film having a film thickness of 20 to: LOOnm is used. Since it is formed on the flat silicon oxide film 1076, the barrier film 1078 is also flat.
- the noria film 1078 is a film having a function of preventing diffusion of hydrogen and water, like the noria films 1044, 1046, 1058, and 1062. Furthermore, since the barrier film 1078 is flat, it is formed with extremely good coverage (coverability) as compared with the noria films 1044, 1046, and 1058, similarly to the noria film 1062. Therefore, the diffusion of hydrogen and moisture can be prevented more reliably.
- the NORA film 1078 is similar to the NORA film 1062 and includes not only the memory cell area of the FeRAM chip in which a plurality of memory cells having the ferroelectric capacitor 1042 are arranged, but also the FeRAM chip including the peripheral circuit area and the like. It is formed over the entire surface.
- a silicon oxide film 1080 having a thickness of, for example, lOOnm is formed on the noria film 1078.
- An interlayer insulating film 1082 is composed of 80.
- the interlayer insulating film 1082 includes contact holes 10 reaching the wirings 1072a and 1072b, respectively.
- a rare metal film (not shown) is formed in the contact holes 1084a and 1084b.
- This noria metal film is composed of, for example, a Ti film with a thickness of 20 nm and a TiN film with a thickness of 50 nm formed thereon. It is also possible to construct a barrier metal film only from a TiN film without forming a Ti film!
- Conductor plugs 1086a and 1086b which also serve as tamper stickers, are buried in the contact holes 1084a and 1084b in which the rare metal film is formed, respectively.
- Wirings 1088a and 1088b are, for example, a TiN film having a thickness of 50 nm, an AlCu alloy film having a thickness of 500 nm formed thereon, and a film formed thereon A 150 nm thick TiN film and force are also constructed.
- a silicon oxide film 1090 covering the wirings 1088a and 1088b is formed.
- the thickness of the silicon oxide film 1090 is, for example, 100 to 300 nm.
- a silicon nitride film 1092 having a thickness of 350 nm is formed on the silicon oxide film 1090.
- an opening 1096 reaching the wiring (bonding pad) 1088b is formed in the polyimide resin film 1094, the silicon nitride film 1092, and the silicon oxide film 1090. That is, an opening 1096a reaching the wiring (bonding pad) 1088b is formed in the silicon nitride film 1092 and the silicon oxide film 1090. Further, an opening 1096b is formed in the polyimide resin film 1094 in a region including the opening 1096a.
- An external circuit (not shown) is electrically connected to the wiring (bonding pad) 1088b through the opening 1096.
- the semiconductor device according to the reference example is configured.
- the flat films with excellent coverage (coverability) 1062 and 1078 are formed. It can block moisture and prevent hydrogen and moisture from reaching the ferroelectric film 1038. That is, even if both the barrier films 1062 and 1078 are defective, in most cases, their positions are shifted from each other, so that at least one barrier film prevents intrusion of hydrogen and moisture. Can do.
- NSG (Non-Silicate-Glass) films formed by plasma CVD using TEOS (Tetra-EthyHDrtho-Silicate) as a source gas may be used.
- TEOS Tetra-EthyHDrtho-Silicate
- moisture remains in the film.
- the contact holes 1068, 1084a Or the side wall force of 1084b concentrates trying to escape.
- the water reaches the side wall, the strong moisture that cannot be completely removed to the outside remains on the side wall of the contact hole or inside thereof. For this reason, the growth of the noria metal film and the tungsten film is hindered.
- FIG. 2A is a plan view showing a ferroelectric memory (semiconductor device) according to the first embodiment of the present invention
- FIG. 2B is a cross-sectional view showing the same ferroelectric memory.
- the ferroelectric memory according to the first embodiment is partitioned into a memory cell unit 101, a logic circuit unit 102, a peripheral circuit unit 103, and a pad unit 104.
- a memory cell unit 101 As shown in FIGS. 2A and 2B, the ferroelectric memory according to the first embodiment is partitioned into a memory cell unit 101, a logic circuit unit 102, a peripheral circuit unit 103, and a pad unit 104.
- FIG. 2A and FIG. 2B for the sake of convenience, it is not necessary that these are aligned in one direction, and more elements are provided in each part.
- an element isolation region 2 that defines an element region is formed on a semiconductor substrate 1 such as a silicon substrate.
- a well la is formed in the element region defined by the element isolation region 2.
- the conductivity type of the uel la can be arbitrarily selected according to the element to be formed thereon.
- a gate electrode (gate wiring) 4 is formed on the well la via a gate insulating film 3.
- the gate electrode 4 has, for example, a polycide structure in which a metal silicide film such as a tungsten silicide film is stacked on a polysilicon film.
- a cap insulating film 5 such as a silicon oxide film is formed on the gate electrode 4.
- Sidewall insulating films 6 are formed on the sides of the gate electrode 4 and the cap insulating film 5.
- a source Z drain diffusion layer having an LDD structure is formed so as to sandwich the gate electrode 4 in plan view.
- a low concentration diffusion layer 7 and a high concentration diffusion layer 8 are formed in the source Z drain diffusion layer.
- a transistor having the gate electrode 4 and the source Z drain diffusion layer having the LDD structure is formed.
- the transistor is an N-channel MOS transistor, boron (B) is introduced into the well la, phosphorus (P) is introduced into the low concentration diffusion layer 7, and arsenic (As) is introduced into the high concentration diffusion layer 8. be introduced.
- a SiON film 9 and a silicon oxide film 10 covering the transistor are sequentially stacked.
- the surface of the silicon oxide film 10 is flattened.
- a silicon oxide film 11 and a barrier film 12 are sequentially stacked on the silicon oxide film 10.
- a lower electrode 13 a is formed on the noria film 12.
- a ferroelectric film 14a is formed on the lower electrode 13a.
- an upper electrode 15a is formed on the ferroelectric film 14a.
- the lower electrode 13a, the ferroelectric film 14a, and the upper electrode 15a constitute a ferroelectric capacitor 1042.
- a barrier film 16 is formed so as to cover the upper surface and side surfaces of the ferroelectric film 14a and the upper electrode 15a.
- the barrier film 16 is a film having a function of preventing diffusion of hydrogen and moisture.
- the metal oxide composing the ferroelectric film 14a is reduced by hydrogen or moisture, and the electrical characteristics of the ferroelectric capacitor deteriorate. Since the barrier film 16 is formed so as to cover the upper surface and the side surfaces of the ferroelectric film 14a and the upper electrode 15a, hydrogen and moisture are prevented from reaching the ferroelectric film 14a. It is possible to suppress deterioration of the physical characteristics.
- a barrier film 17 that covers the noria film 16 and the ferroelectric capacitor is formed. Similar to the barrier film 16, the barrier film 17 is a film having a function of preventing the diffusion of hydrogen and moisture.
- An interlayer insulating film 18 such as a silicon oxide film is formed on the noria film 17.
- the surface of the interlayer insulating film 18 is flattened.
- Interlayer insulation film 18, barrier film 17, barrier film 12, silicon oxide film 11, silicon oxide film 10 and SiON film 9 are contacted to reach high concentration diffusion layer 8 of the source Z drain diffusion layer Hole 20 is formed.
- the upper insulating layer 18, the noria film 17 and the barrier film 16 are A contact hole 23t reaching the pole 15a is formed.
- a contact hole 23b reaching the lower electrode 13a is formed in the interlayer insulating film 18, the noria film 17, and the barrier film 16.
- a barrier metal film (not shown) is formed in the contact holes 23t and 23b.
- This rare metal film is composed of, for example, a Ti film and a TiN film formed thereon.
- the Ti film is formed to reduce contact resistance, and the TiN film is formed to prevent diffusion of tungsten as a conductor plug material.
- the barrier metal film formed in each of the contact holes described later is also formed for the same purpose.
- a conductor plug 21 that is a tanta-stainer is buried in the contact holes 23t and 23b in which the noria metal film is formed.
- a wiring 24a (first wiring) is formed on the interlayer insulating film 18, in the contact hole 23t, and in the contact hole 23b. A part of the wiring 24a is electrically connected to the conductor plug 21 connected to the high-concentration diffusion layer 8 and the upper electrode 15a.
- the transistor high-concentration diffusion layer 8, the ferroelectric capacitor upper electrode 14a, and the 1S wiring 24a are electrically connected to each other, so that one transistor and one ferroelectric capacitor FeRAM 1T1C type memory cells having the above structure are formed.
- a plurality of memory cells are arranged in the memory cell region of the FeRAM chip.
- a barrier film 25 is formed to cover the upper surface and side surfaces of the wiring 24a. Since the NORA film 25 is formed following the wiring 24a, irregularities exist between the wirings 24a.
- the silicon oxide film 26 is formed so as to fill the unevenness. The surfaces of the barrier film 25 and the silicon oxide film 26 are supported.
- a noria film 27 is formed on the noria film 25 and the silicon oxide film 26. Since the noria film 25 and the silicon oxide film 26 are flattened, the noria film 27 is also flat. Silicon oxide films 28 and 29 are sequentially stacked on the barrier film 27. The surface of the silicon oxide film 29 is flattened.
- a barrier layer is composed of the noria films 25 and 27.
- An interlayer insulating film is composed of the silicon oxide films 28 and 29.
- the silicon oxide film 29, the silicon oxide film 28, the noor film 27, and the barrier film 25 have wiring 24a A contact hole 30 reaching a part of is formed.
- a nore metal film (not shown) is formed.
- This rare metal film is composed of, for example, a Ti film and a TiN film formed thereon. It is also possible to construct the barrier metal film only from the TiN film without forming the Ti film!
- a conductor plug 31 made of tungsten is embedded in the contact hole 30 in which the rare metal film is formed.
- a wiring 32 a (second wiring) partially connected to the conductor plug 31 is formed on the silicon oxide film 28. Further, a silicon oxide film 33 covering the wiring 32a is formed. The surface of the silicon oxide film 33 is flattened. A silicon oxide film 34 is formed on the silicon oxide film 33. Since the silicon oxide film 33 is formed on the flattened silicon oxide film 33, the silicon oxide film 34 is also flat.
- a contact hole 35 reaching a part of the wiring 32a is formed.
- a barrier metal film (not shown) is formed in the contact hole 35.
- This noria metal film is composed of, for example, a Ti film and a TiN film formed thereon. Note that the barrier metal film may be composed of only the TiN film without forming the Ti film.
- a conductor plug 36 made of tungsten is embedded in the contact hole 35 in which the nore metal film is formed!
- a wiring 37 electrically connected to the conductor plug 36 is formed on the silicon oxide film 34.
- a silicon oxide film 38 covering the wiring 37 is formed.
- a silicon nitride film 39 is formed on the silicon oxide film 38.
- an opening 40 exposing a part of the wiring 37 in the pad portion 104 is formed in the silicon oxide film 38 and the silicon nitride film 39. The portion exposed from the opening 40 of the wiring 37 functions as a bonding pad.
- a polyimide resin film 41 is formed on the silicon nitride film 39.
- the polyimide resin film 41 is formed with an opening 42 that matches the opening 40 within the pad 104.
- an external circuit (not shown) is electrically connected to the portion functioning as a bonding pad of the wiring 37 through the openings 42 and 41.
- the pad portion 104 a part of the wiring and the contact hole is formed in a ring shape, and this portion functions as the moisture-resistant ring 42.
- 3A to 3Y are cross-sectional views showing a method of manufacturing a ferroelectric memory (semiconductor device) according to the first embodiment of the present invention in the order of steps.
- an element isolation region 2 that defines an element region is formed on the surface of a semiconductor substrate 1 such as a silicon substrate.
- a well la is formed in the element region defined by the element isolation region 2.
- a transistor including the gate insulating film 3, the gate electrode 4, the cap insulating film 5, the sidewall insulating film 6, the low concentration diffusion layer 7, and the high concentration diffusion layer 8 is formed on the well la.
- the thickness of the gate insulating film 3 is about 6 to 7 nm, for example.
- the structure of the gate electrode 4 is, for example, a polycide structure including a polysilicon film having a thickness of about 50 nm and a metal silicide film such as a tungsten silicide film formed thereon having a thickness of about 150 nm.
- a metal silicide film such as a tungsten silicide film formed thereon having a thickness of about 150 nm.
- the cap insulating film 5 for example, a silicon oxide film having a thickness of about 45 nm is formed.
- the gate length is set to about 360 nm, for example.
- an SiO N film 9 covering the transistor is formed by, eg, plasma CVD.
- the thickness of the SiON film 9 is, for example, about 200 nm.
- a silicon oxide film (NSG film) 10 is formed on the SiON film 9 by plasma CVD using TEOS as a source gas, for example.
- the thickness of the silicon oxide film 10 is 600 nm, for example.
- the surface of the silicon oxide film 10 is flattened by polishing, for example, about 200 nm by a CMP method.
- a silicon oxide film (NSG film) 11 is formed on the silicon oxide film 10 by, for example, a plasma CVD method using TEOS as a source gas.
- the thickness of the silicon oxide film 11 is, for example, lOOnm.
- the silicon oxide film 11 is heat-treated at, for example, 650 ° C. for 30 minutes in a dinitrogen monoxide (N 2 O) or nitrogen (N 2) atmosphere. This result
- the silicon oxide film 11 is dehydrated and the surface of the silicon oxide film 11 is slightly nitrided.
- nitrogen is supplied at a flow rate of 20 liters Z.
- a barrier film 12 is formed on the silicon oxide film 11.
- the noria film 12 for example, an aluminum oxide film having a thickness of about 20 nm is formed by the PVD method.
- R Heat treatment annealing
- oxygen is supplied at a flow rate of 2 liters Z during this heat treatment.
- a lower electrode film 13 is formed on the noria film 12.
- a Pt film having a thickness of about 155 nm is formed by the PVD method.
- a ferroelectric film 14 is formed on the lower electrode film 13.
- a PZT film having a thickness force of about 50 to 200 nm is formed by the PVD method.
- heat treatment annealing
- oxygen is supplied at a flow rate of 0.025 liter Z.
- the upper electrode film 15 is formed on the ferroelectric film 14.
- an IrO film is formed by the PVD method, and then the IrO film is formed by, for example, the PVD method.
- the thickness of the IrO film and IrO film is, for example, about 50 nm, 200
- the RTA method is used.
- Heat treatment at 725 ° C for 20 seconds.
- oxygen is supplied at a flow rate of 0.025 liter Z.
- the upper electrode film 15 is patterned using a resist pattern (not shown) to form the upper electrode 15a.
- a recovery annealing process is performed on 14 mm ferroelectric film at 650 ° C for 60 minutes.
- oxygen is supplied into the vertical furnace at a flow rate of 20 liters Z.
- the ferroelectric film 14 is patterned using another resist pattern (not shown) to form a capacitive insulating film.
- this capacitive insulating film is represented as a ferroelectric film 14a.
- a recovery annealing process is performed on the ferroelectric film 14a at 350 ° C. for 60 minutes. During this recovery annealing process, for example, oxygen is supplied into the vertical furnace at a flow rate of 20 liters Z.
- a barrier film 16 is formed to cover the upper and side surfaces of the upper electrode 15a and the ferroelectric film 14a.
- the noria film 16 for example, an acid aluminum film having a thickness of about 50 nm is formed by the PVD method.
- a recovery annealing treatment is performed at 550 ° C for 60 minutes in a vertical furnace.
- oxygen is supplied at a flow rate of 20 liters Z during the recovery annealing process.
- the lower electrode film 13 and the barrier film 16 are patterned using another resist pattern (not shown) to form the lower electrode 13a.
- the lower electrode 13a, the ferroelectric film 14a, and the upper electrode 15a constitute a ferroelectric capacitor.
- a recovery annealing process is performed at 650 ° C. for 60 minutes in a vertical furnace.
- oxygen is supplied at a flow rate of 20 liters Z during the recovery annealing process.
- a barrier film 17 covering the ferroelectric capacitor and the barrier film 16 is formed.
- the noria film 17 for example, an aluminum oxide film having a thickness of about 20 nm is formed by the PVD method.
- a recovery annealing process is performed at 550 ° C for 60 minutes in a vertical furnace. For example, oxygen is supplied at a flow rate of 20 liters Z during the recovery annealing process.
- an inter-layer insulating film 18 that completely covers the ferroelectric capacitor and the barrier film 17 is formed.
- a silicon oxide film (NSG film) is formed by plasma CVD using TEOS as a source gas, for example.
- the thickness of the interlayer insulating film 18 is, for example, 1500 nm.
- the surface of the interlayer insulating film 18 is planarized by polishing, for example, by a CMP method. Next, for example, a process using N 2 O plasma in a CVD apparatus.
- the surface of the interlayer insulating film 18 is nitrided.
- This plasma ball is performed at 350 ° C. for 2 minutes, for example.
- the interlayer insulating film 18, the barrier film 17, the barrier film 12, the silicon oxide film 11, and the silicon oxide film By patterning the film 10 and the SiON film 9, a contact hole 20 reaching the high concentration diffusion layer 8 is formed.
- a Ti film having a thickness of about 20 nm and a TiN film having a thickness of about 50 nm are sequentially formed as a barrier metal film (not shown) on the entire surface by, eg, PVD.
- a tungsten film having a thickness of about 500 nm is formed on the entire surface by, eg, CVD.
- the tungsten film, the TiN film, and the Ti film are polished by CMP, for example, until the interlayer insulating film 18 is exposed.
- CMP for example, until the interlayer insulating film 18 is exposed.
- a tungsten film remains in the contact hole 20, and as shown in FIG. 3J, a conductor plug 21 is formed from this tungsten film.
- the surface of the interlayer insulating film 18 is nitrided by performing plasma annealing using N 2 O plasma in a CVD apparatus, for example.
- interlayer insulation film 1 A SiON film 22 having a thickness of about lOOnm is formed on the substrate 8 by, for example, a plasma CVD method.
- the SiON film 22, the interlayer insulating film 18, the noria film 17 and the barrier film 12 are patterned using a resist mask (not shown) on which a predetermined pattern is formed.
- a contact hole 23t reaching the upper electrode 15a and a contact hole 23b reaching the lower electrode 13a are formed.
- a recovery annealing process is performed at 500 ° C. for 60 minutes in a vertical furnace, for example. During the recovery annealing process, for example, oxygen is supplied at a flow rate of 20 liters Z.
- the SiON film 22 is removed (etched back) by etching.
- the conductor film 24 is formed by, for example, the PVD method.
- a TiN film having a thickness of 150 nm, an AlCu alloy film having a thickness of 550 nm, a Ti film having a thickness of 5 nm, and a TiN film having a thickness of 150 nm are sequentially formed.
- the conductor film 24 is patterned using a resist mask (not shown) on which a predetermined pattern is formed, thereby forming the wiring 24a.
- heat treatment annealing
- oxygen is supplied at a flow rate of 20 liters Z during this heat treatment.
- a barrier film 25 covering the wiring 24a is formed.
- the barrier film 25 for example, an aluminum oxide film having a thickness of about 20 nm is formed by the PVD method.
- a silicon oxide film 26 that fills the gap between the adjacent wirings 24a is formed.
- the silicon oxide film 26 for example, an NSG film is formed by a plasma CDV method using TEOS as a source gas.
- the silicon oxide film 26 is polished by CMP, for example, until the surface of the barrier film 25 is exposed. Then, for example, using N 2 O plasma in a CVD device
- the surface of the silicon oxide film 26 is nitrided by performing plasma annealing. This brass manil is performed, for example, at 350 ° C for 4 minutes. In this plasma anneal, the silicon oxide film 26 is also dehydrated.
- a noria film 27 is formed on the noria film 25 and the silicon oxide film 26.
- the noria film 27 for example, an aluminum oxide having a thickness of about 50 nm
- the film is formed by PVD method.
- a silicon oxide film 28 is formed on the noria film 27.
- the silicon oxide film 28 for example, an NSG film is formed by a plasma CVD method using TEOS as a source gas.
- the thickness of the silicon oxide film 28 is, for example, about 2600 nm.
- the surface of the silicon oxide film 28 is nitrided. This plasma annealing is performed at 350 ° C for 4 minutes, for example. In this plasma annealing, the silicon oxide film 28 is also dehydrated.
- a silicon oxide film 29 is formed on the silicon oxide film 28.
- the silicon oxide film 29 for example, an NSG film is formed by a plasma CVD method using TEOS as a source gas. Further, the thickness of the silicon oxide film 29 is, for example, about lOOnm. Next, for example, by performing plasma annealing using N 2 O plasma in a CVD apparatus, the silicon oxide film 29 is formed.
- This plasma annealing is performed at 350 ° C. for 2 minutes, for example. In this plasma annealing, the silicon oxide film 29 is also dehydrated.
- a TiN film having a thickness of about 50 nm is formed as a barrier metal film (not shown) on the entire surface by, eg, PVD.
- a tungsten film having a thickness of about 650 nm is formed on the entire surface by, eg, CVD.
- the tungsten film and the TiN film are polished by CMP, for example, until the silicon oxide film 29 is exposed.
- the conductor plug 31 is formed from this tungsten film as shown in FIG. 3U.
- the conductor film 32 is formed by, for example, the PVD method.
- an AlCu alloy film having a thickness of 550 nm, a Ti film having a thickness of 5 nm, and a TiN film having a thickness of 150 nm are sequentially formed.
- the conductor film 32 is patterned using a resist mask (not shown) on which a predetermined pattern is formed, thereby forming a wiring 32a.
- a silicon oxide film 33 is formed to cover the wiring 32a.
- the silicon oxide film 33 for example, an NSG film is formed by a plasma CVD method using TEOS as a source gas. Also silicon oxide film The thickness of 33 is, for example, 2200 nm.
- the surface of the silicon oxide film 33 is planarized by polishing, for example, by the CMP method. Then, for example, in the CVD device
- the surface of the silicon oxide film 33 is nitrided by performing plasma annealing using plasma. This plasma annealing is performed at 350 ° C. for 4 minutes, for example.
- a silicon oxide film 34 having a thickness of, for example, about lOOnm is formed on the silicon oxide film 33.
- an NSG film is formed by a plasma CVD method using TEOS as a source gas.
- a process using N 2 O plasma in a CVD apparatus for example, a plasma CVD method using TEOS as a source gas.
- the surface of the silicon oxide film 33 is nitrided. This plasma annealing is performed at 350 ° C. for 2 minutes, for example.
- the silicon oxide films 34 and 33 are patterned to reach the wiring 32a. Hole 35 is formed. Thereafter, a TiN film having a thickness of about 50 nm is formed as a barrier metal film (not shown) on the entire surface by, eg, PVD. Subsequently, a tungsten film having a thickness of about 650 nm is formed on the entire surface by, eg, CVD. Next, the tungsten film and the TiN film are polished by CMP, for example, until the silicon oxide film 34 is exposed.
- the wiring 37 is formed by, for example, the PVD method.
- an AlCu alloy film having a thickness of 500 nm and a TiN film having a thickness of 15 Onm are sequentially formed and patterned.
- a silicon oxide film 38 covering the wiring 37 is formed.
- the silicon oxide film 38 for example, an NSG film is formed by a plasma CVD method using TEOS as a source gas.
- the thickness of the silicon oxide film 38 is, for example, about lOOnm.
- the surface of the chemical film 38 is nitrided. This plasma annealing is performed at 350 ° C. for 2 minutes, for example.
- a silicon nitride film 39 having a thickness of about 350 nm is formed on the silicon oxide film 38 by, eg, plasma CVD.
- the silicon oxide film 38 and the silicon nitride film 39 function as a passivation film.
- a resist mask (not shown) on which a predetermined pattern is formed. ) Is used to pattern the silicon nitride film 39 and the silicon oxide film 38, thereby forming an opening 40 that exposes part of the wiring 37 in the node 104. In this patterning, the TiN film constituting the wiring 37 is also removed.
- a protective film 41 having a thickness of about 3 ⁇ m is formed on the silicon nitride film 39 by applying photosensitive polyimide. Subsequently, an opening 42 exposing the opening 40 is formed in the node 104 by exposing and developing the protective film 41.
- heat treatment is performed at 310 ° C for 40 minutes in a horizontal furnace.
- nitrogen is supplied at a flow rate of 100 liters Z.
- the protective film 41 made of photosensitive polyimide is cured.
- the barrier film 1062 exists on the silicon oxide films 1060 and 1061, and the NORA film 1062 is the water in the silicon oxide films 1060 and 1061. Inhibits upward withdrawal of minutes. For this reason, moisture tends to be released through the contact hole 1068, thereby inhibiting the formation of the rare metal film and the tungsten film.
- 6A to 6B are sectional views showing a method of manufacturing a ferroelectric memory (semiconductor device) according to the second embodiment of the present invention in the order of steps.
- the processes up to the formation of the silicon oxide film 26 are performed as shown in FIG. 3P.
- the silicon oxide film 26 and the barrier film 25 are polished by, eg, CMP, until the surface of the wiring 24a is exposed. Then, for example, N O in a CVD device
- the surface of the silicon oxide film 26 is nitrided by plasma annealing using plasma. To do. This plasma annealing is performed at 350 ° C. for 4 minutes, for example. In this plasma annealing, the silicon oxide film 26 is also dehydrated.
- a barrier film 27 is formed on the wiring 24 a, the noria film 25 and the silicon oxide film 26.
- the noria film 27 for example, an acid aluminum film having a thickness of about 50 nm is formed by the PVD method.
- a structure similar to that of the embodiment can be obtained.
- the surface force of the silicon oxide film 29 can also be desorbed. For this reason, the same effect as the first embodiment can be obtained.
- FIG. 8 is a cross-sectional view showing a ferroelectric memory (semiconductor device) according to a third embodiment of the present invention.
- a silicon oxide film 61 is formed between adjacent wirings 32a, and a noria film 62 is formed on the silicon oxide film 61 and the wirings 32a.
- a silicon oxide film 63 is formed on the noria film 62. That is, instead of the silicon oxide film 33 in the first embodiment, a silicon oxide film 61, a noria film 62, and a silicon oxide film 63 are formed.
- a ferroelectric memory In manufacturing such a ferroelectric memory according to the third embodiment, first, processing up to the formation of the wiring 32a is performed in the same manner as in the first embodiment. Next, a silicon oxide film 61 that covers the wiring 32a is formed, and flattened by, for example, CMP until the wiring 32a is exposed.
- the silicon oxide film 61 for example, an NSG film is formed by a plasma CVD method using TEOS as a source gas. Then, for example, a brazing using N 2 O plasma in a CVD apparatus.
- the surface of the silicon oxide film 61 is nitrided by performing Zumanealing.
- the noria film 62 is formed on the wiring 32a.
- an aluminum oxide film is formed by the PVD method.
- a silicon oxide film 63 is formed on the noria film 62, and a flat film is formed.
- an NSG film is formed by a plasma CVD method using TEOS as a source gas. After that, for example, using a plasma with NO plasma
- the surface of the silicon oxide film 63 is nitrided by performing Zumanealing.
- the processing after the formation of the silicon oxide film 34 is performed.
- the flat barrier film 62 since the flat barrier film 62 is added, it is possible to prevent the intrusion of moisture more reliably as compared with the first embodiment. Further, since the barrier film 62 is in contact with the surface of the wiring 32a, the moisture in the silicon oxide films 63 and 34 can release the surface force of the silicon oxide film 34 when the conductor plug 36 is formed. Therefore, the formation of the conductor plug 36 is not hindered.
- FIG. 9 is a cross-sectional view showing a ferroelectric memory (semiconductor device) according to a fourth embodiment of the present invention.
- a silicon oxide film 61, a noria film 62, and a silicon oxide film 63 are formed instead of the silicon oxide film 33 in the second embodiment. Therefore, the effect of the third embodiment can be obtained together with the effect of the second embodiment.
- the barrier film is not limited to an acid-aluminum film, and can prevent at least diffusion of hydrogen or water, such as a metal oxide film or a metal nitride film.
- Any film may be used.
- a titanium oxide film, an A1 nitride film, an A1 oxynitride film, a Ta oxide film, a Ta nitride film, a Zr oxide film, and a Si oxynitride film can be used. Since the metal oxide film is dense, it is possible to reliably prevent hydrogen diffusion even when the metal oxide film is relatively thin. Therefore, from the viewpoint of miniaturization, it is preferable to use a metal oxide as the noria film.
- the crystal structure of the substance constituting the ferroelectric film is not limited to the bevelskite structure, and may be, for example, a Bi layer structure.
- the composition of the material constituting the ferroelectric film is not particularly limited.
- the acceptor element may contain Pb (lead), Sr (strontium), Ca (calcium), Bi (bismuth), Ba (barium), Li (lithium) and Z or Y (yttrium).
- Ti titanium
- Zr zirconium
- Hf hafnium
- V vanadium
- Ta tantalum
- W tungsten
- M n manganese
- A1 aluminum
- Contains Bi bismuth
- Z or Sr sinrontium
- the chemical formula of the substance constituting the ferroelectric film is, for example, Pb (Zr, Ti) 2 O, (Pb, Ca)
- Power is not limited to these.
- Si may be added to these.
- the present invention is not limited to application to a ferroelectric memory, but may be applied to, for example, DRAM.
- a ferroelectric film for example, a high dielectric film such as (BaSr) TiO film (BST film), SrTiO film (STO film), TaO film, etc.
- the high dielectric film is a dielectric film having a relative dielectric constant higher than that of silicon dioxide.
- the composition of the upper electrode and the lower electrode is not particularly limited.
- the bottom electrode may also be configured with, for example, Pt (platinum), Ir (iridium), Ru (ruthenium), Rh (rhodium), Re (rhenium), Os (osmium) and Z or Pd (palladium) forces. It may be composed of these acids.
- the layer below the noble metal cap film of the upper electrode may be composed of, for example, an oxide of Pt, Ir, Ru, Rh, Re, Os and Z or Pd. Further, the upper electrode may be configured by laminating a plurality of films.
- the structure of the ferroelectric memory cell is not limited to the 1T1C type, but may be the 2T2C type.
- the ferroelectric capacitor itself may be configured to serve both as a force storage unit and a switching unit.
- the structure is such that a ferroelectric capacitor is formed instead of the gate electrode of the MOS transistor. That is, a ferroelectric capacitor is formed on a semiconductor substrate via a gate insulating film.
- the method for forming the ferroelectric film is not particularly limited.
- sol-gel method organometallic decomposition (MOD) method, CSD (Chemical Solution Deposition) method, chemical vapor deposition (CV D) method, epitaxial growth method, sputtering method, MOCVD (Metal Organic Chemical Vapor Deposition) Laws can be adopted.
- MOD organometallic decomposition
- CSD Chemical Solution Deposition
- CV D chemical vapor deposition
- epitaxial growth method sputtering method
- MOCVD Metal Organic Chemical Vapor Deposition
- the structure of the ferroelectric capacitor is a planar structure. Force Use ferroelectric capacitors with a stack structure!
- a high barrier performance can be obtained because the noria layer having a flat surface is formed.
- the barrier layer since the barrier layer directly covers the first wiring, the barrier layer may prevent moisture from separating from the interlayer insulating film located between the second wiring and the first wiring. Absent. Therefore, the electrical connection between the first wiring and the second wiring can be kept in a good state.
- a barrier film third noria film
Abstract
Description
Claims
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KR1020107023102A KR101095408B1 (ko) | 2005-12-28 | 2005-12-28 | 반도체 장치 |
CN2005800524472A CN101351880B (zh) | 2005-12-28 | 2005-12-28 | 半导体器件及其制造方法 |
PCT/JP2005/024059 WO2007077598A1 (ja) | 2005-12-28 | 2005-12-28 | 半導体装置及びその製造方法 |
KR1020087014660A KR101027993B1 (ko) | 2005-12-28 | 2005-12-28 | 반도체 장치 및 그 제조 방법 |
JP2007552820A JP5251129B2 (ja) | 2005-12-28 | 2005-12-28 | 半導体装置及びその製造方法 |
US12/147,899 US20080258195A1 (en) | 2005-12-28 | 2008-06-27 | Semiconductor device and method of manufacturing the same |
US14/030,567 US20140017819A1 (en) | 2005-12-28 | 2013-09-18 | Semiconductor device and method of manufacturing the same |
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JP2007095898A (ja) * | 2005-09-28 | 2007-04-12 | Toshiba Corp | 半導体記憶装置及びその製造方法 |
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2005
- 2005-12-28 KR KR1020107023102A patent/KR101095408B1/ko active IP Right Grant
- 2005-12-28 JP JP2007552820A patent/JP5251129B2/ja not_active Expired - Fee Related
- 2005-12-28 WO PCT/JP2005/024059 patent/WO2007077598A1/ja active Application Filing
- 2005-12-28 CN CN2005800524472A patent/CN101351880B/zh not_active Expired - Fee Related
- 2005-12-28 KR KR1020087014660A patent/KR101027993B1/ko active IP Right Grant
-
2008
- 2008-06-27 US US12/147,899 patent/US20080258195A1/en not_active Abandoned
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2013
- 2013-09-18 US US14/030,567 patent/US20140017819A1/en not_active Abandoned
Patent Citations (2)
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JP2003100994A (ja) * | 2001-09-27 | 2003-04-04 | Oki Electric Ind Co Ltd | 強誘電体メモリおよびその製造方法 |
JP2003273325A (ja) * | 2002-03-15 | 2003-09-26 | Oki Electric Ind Co Ltd | 半導体装置およびその製造方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009111280A (ja) * | 2007-10-31 | 2009-05-21 | Fujitsu Microelectronics Ltd | 半導体装置の製造方法 |
CN101894843A (zh) * | 2010-06-04 | 2010-11-24 | 清华大学 | 基于锆钛酸铅存储介质的铁电动态随机存储器及制备方法 |
JP2019091936A (ja) * | 2019-02-27 | 2019-06-13 | 株式会社東芝 | 固体撮像装置の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
KR101027993B1 (ko) | 2011-04-13 |
CN101351880B (zh) | 2012-05-16 |
US20080258195A1 (en) | 2008-10-23 |
KR101095408B1 (ko) | 2011-12-19 |
US20140017819A1 (en) | 2014-01-16 |
JPWO2007077598A1 (ja) | 2009-06-04 |
JP5251129B2 (ja) | 2013-07-31 |
CN101351880A (zh) | 2009-01-21 |
KR20080077985A (ko) | 2008-08-26 |
KR20100123770A (ko) | 2010-11-24 |
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