WO2022230412A1 - 誘電体、キャパシタ、電気回路、回路基板、及び機器 - Google Patents
誘電体、キャパシタ、電気回路、回路基板、及び機器 Download PDFInfo
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- WO2022230412A1 WO2022230412A1 PCT/JP2022/011753 JP2022011753W WO2022230412A1 WO 2022230412 A1 WO2022230412 A1 WO 2022230412A1 JP 2022011753 W JP2022011753 W JP 2022011753W WO 2022230412 A1 WO2022230412 A1 WO 2022230412A1
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- 239000000203 mixture Substances 0.000 claims abstract description 13
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- 239000002184 metal Substances 0.000 claims description 23
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 239000003792 electrolyte Substances 0.000 claims description 13
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- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims description 6
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/085—Vapour deposited
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/10—Metal-oxide dielectrics
- H01G4/105—Glass dielectric
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0029—Processes of manufacture
- H01G9/0032—Processes of manufacture formation of the dielectric layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G9/052—Sintered electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/07—Dielectric layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G2009/05—Electrodes or formation of dielectric layers thereon characterised by their structure consisting of tantalum, niobium, or sintered material; Combinations of such electrodes with solid semiconductive electrolytes, e.g. manganese dioxide
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
- H01G9/0425—Electrodes or formation of dielectric layers thereon characterised by the material specially adapted for cathode
Definitions
- the present disclosure relates to dielectrics, capacitors, electrical circuits, circuit boards, and equipment.
- Patent Document 1 describes a capacitor element using an anode foil on which a dielectric oxide film is formed as a general aluminum electrolytic capacitor.
- the dielectric oxide film is formed by anodic oxidation on the surface of the aluminum foil whose effective surface area has been increased by etching.
- Patent Document 1 describes a method for manufacturing an electrode foil in which aluminum is etched by applying an alternating current in an electrolytic solution.
- the electrolytic solution is an aqueous solution containing hydrochloric acid as a main component and to which at least one of sulfuric acid, oxalic acid, and phosphoric acid is added.
- the current density at which the alternating current is applied takes the maximum value at the beginning of the etching process and gradually decreases from the maximum value until the current density reaches 0 in the middle stage. According to this manufacturing method, it is explained that the surface area of the electrode foil can be increased by forming minute and high-density etching pits, and the capacitance of the aluminum electrolytic capacitor can be increased.
- US Pat. No. 5,330,000 describes a capacitor with a dielectric layer overlying the porous portion of a conductive porous substrate.
- Metal oxides such as Al 2 O 3 are described as materials for forming the dielectric layer.
- the dielectric layer is formed not by an anodized film but by a deposition method such as atomic layer deposition.
- Patent Documents 1 and 2 have room for reexamination from the viewpoint of increasing the capacitance while keeping the dielectric loss of the capacitor low. Accordingly, the present disclosure provides a dielectric that is advantageous from the viewpoint of increasing the capacitance while keeping the dielectric loss of the capacitor low.
- This disclosure is including an amorphous complex oxide having a composition represented by Ce x Al 1-x O k , In the composition, the condition of 0.400 ⁇ x ⁇ 0.900 is satisfied, and k is a value that maintains the electroneutrality of the composite oxide. Provide a dielectric.
- FIG. 1 is a cross-sectional view of a capacitor according to an embodiment of the present disclosure
- FIG. 2A is a cross-sectional view of a capacitor according to another embodiment of the present disclosure
- FIG. 2B is a cross-sectional view of a variation of the capacitor shown in FIG. 2A.
- FIG. 3A is a schematic diagram of an electrical circuit according to an embodiment of the present disclosure
- FIG. 3B is a schematic diagram of a circuit board according to an embodiment of the present disclosure
- FIG. 3C is a schematic diagram of a device according to an embodiment of the present disclosure
- FIG. 4 is a graph showing the relationship between the dielectric constant of the dielectric film and the atomic number ratio of metal atoms for each sample.
- FIG. 4 is a graph showing the relationship between the dielectric constant of the dielectric film and the atomic number ratio of metal atoms for each sample.
- FIG. 5 is a graph showing the relationship between the dielectric loss tangent of the dielectric film and the atomic number ratio of metal atoms for each sample.
- FIG. 6 is an X-ray diffraction (XRD) pattern of dielectric films according to samples 1 to 4.
- FIG. 7 shows XRD patterns of dielectric films according to samples 5 and 6.
- FIG. 8 is the XRD pattern of the dielectric films according to samples 7 to 11.
- FIG. XRD X-ray diffraction
- the porous portion can be formed by etching the surface of the metal foil.
- a metal foil having a porous portion By subjecting a metal foil having a porous portion to a chemical conversion treatment such as anodization to form a metal oxide on the surface of the metal skeleton of the porous portion, a capacitor having the metal oxide as a dielectric can be produced. Since the porous portion has a large surface area, the capacitance of the capacitor can be increased. On the other hand, there is a limit to increasing the surface area of the porous portion. Moreover, depending on the usage of the capacitor, it may be difficult to use the metal foil having the porous portion as the electrode of the capacitor. It is also important to keep the dielectric loss of the capacitor low.
- the present inventors have made extensive studies to develop a new dielectric material that has advantageous properties from the viewpoint of increasing the capacitance while keeping the dielectric loss of the capacitor low.
- the present inventors have newly found that a material containing a predetermined composite oxide containing Ce and Al is advantageous from the viewpoint of increasing the capacitance while keeping the dielectric loss of the capacitor low. I found it in As a result, the inventors have devised the dielectrics and capacitors of the present disclosure.
- the dielectric according to the first aspect of the present disclosure is including an amorphous complex oxide having a composition represented by Ce x Al 1-x O k ,
- the composition satisfies the condition of 0.400 ⁇ x ⁇ 0.900, and k is a value that maintains the electroneutrality of the composite oxide.
- the dielectric according to the first aspect tends to have a high dielectric constant and a low dielectric loss tangent, and is advantageous from the viewpoint of increasing the capacitance while keeping the dielectric loss of the capacitor low.
- the dielectric may include a sputtering film.
- the dielectric film for the capacitor can be formed by sputtering.
- the dielectric according to the first or second aspect may be used for capacitors. According to the third aspect, this dielectric can be used in capacitors.
- a capacitor according to a fourth aspect of the present disclosure a first electrode; a dielectric according to any one of the first to third aspects disposed on the first electrode; a second electrode covering at least a portion of the dielectric.
- the dielectric tends to have a high dielectric constant and a low dielectric loss tangent
- the capacitance of the capacitor tends to increase and the dielectric loss of the capacitor tends to be kept low.
- At least part of the first electrode may be porous.
- the surface area of the first electrode tends to increase, and the capacitance of the capacitor tends to increase.
- the first electrode may contain a valve metal.
- a member containing a valve metal can be used as the first electrode.
- the valve metal may contain at least one selected from the group consisting of aluminum, tantalum, and niobium.
- a member containing such a valve metal can be used as the first electrode.
- the second electrode is a group consisting of aluminum, tantalum, niobium, gold, silver, platinum, and nickel It may contain at least one selected from. According to the eighth aspect, a member containing such a metal can be used as the second electrode.
- the capacitor according to the fifth aspect may further include an electrolyte in contact with the second electrode.
- the electrolyte may be filled inside the porous body and contain at least one selected from the group consisting of electrolytic solution, conductive polymer, and manganese oxide. According to the ninth aspect, it is possible to provide a capacitor including an electrolyte such as an electrolytic solution.
- An electric circuit according to a tenth aspect of the present disclosure includes a capacitor according to any one of the fourth to ninth aspects. According to the tenth aspect, since the dielectric loss of the capacitor is low and the capacitance of the capacitor is likely to be high, the characteristics of the electric circuit are likely to be improved.
- a circuit board according to an eleventh aspect of the present disclosure includes a capacitor according to any one of the fourth to ninth aspects. According to the eleventh aspect, since the dielectric loss of the capacitor is low and the capacitance of the capacitor is likely to be high, the characteristics of the circuit board are likely to be improved.
- a device includes a capacitor according to any one of the fourth to ninth aspects. According to the twelfth aspect, since the dielectric loss of the capacitor is low and the capacitance of the capacitor is likely to be high, the characteristics of the device are likely to be improved.
- FIG. 1 is a cross-sectional view showing a capacitor 1a according to an example of an embodiment of the present disclosure.
- the capacitor 1a comprises a dielectric 10.
- dielectric 10 is the material for the capacitor.
- Dielectric 10 contains a composite oxide having a composition represented by Ce x Al 1-x O k . This composition satisfies the condition 0.400 ⁇ x ⁇ 0.900.
- k is a value that maintains electrical neutrality of the composite oxide.
- Ce has a valence of 3
- k is 1.5.
- k is 1.7 or more and less than 1.95.
- a composite oxide is amorphous.
- Dielectric 10 containing such a composite oxide tends to have a high dielectric constant and a low dielectric loss tangent. Therefore, the capacitor 1a tends to exhibit a high capacitance, and the dielectric loss of the capacitor 1a tends to be kept low.
- the composite oxide contained in the dielectric 10 is, for example, a solid solution of aluminum oxide and cerium oxide.
- x is desirably 0.475 or more. Thereby, the dielectric 10 tends to have a high dielectric constant. x may be 0.500 or more, or 0.600 or more depending on the case.
- x is preferably 0.880 or less, more preferably 0.850 or less, still more preferably 0.840 or less, and particularly preferably 0.830 or less. Thereby, the dielectric 10 tends to have a low dielectric loss tangent.
- the dielectric constant of dielectric 10 is not limited to a specific value.
- Dielectric 10 has a dielectric constant higher than, for example, Al 2 O 3 .
- the dielectric constant of the dielectric 10 at 10 kHz is, for example, 14.0 or higher, preferably 15.0 or higher, and more preferably 18.0 or higher.
- the relative dielectric constant of the dielectric 10 at 10 kHz may be 22.0 or more, or 25.0 or more depending on the case.
- the dielectric constant of the dielectric 10 at 1 MHz is, for example, 13.0 or higher, preferably 14.0 or higher, more preferably 15.0 or higher, and even more preferably 17.0 or higher.
- the relative permittivity of the dielectric 10 at 1 MHz may be 21.0 or more, or 24.0 or more depending on the case.
- the dielectric loss tangent of the dielectric 10 is not limited to a specific value.
- the dielectric loss tangent of the dielectric 10 at 10 kHz and 1 MHz is, for example, 0.020 or less.
- the dissipation factor of dielectric 10 at 10 kHz and 1 MHz may be less than 0.020, for example.
- the composite oxide is amorphous. Since dielectric 10 contains such a composite oxide, leakage current is less likely to occur in dielectric 10 . This is because, in the composite oxide, it is considered possible to suppress the generation of leakage current due to grain boundaries of crystals. Therefore, the dielectric 10 tends to have a high dielectric constant and a low dielectric loss tangent. For example, in the XRD pattern of the composite oxide at a diffraction angle of 10° to 50°, if a peak with a half width of 5° or less and a clear peak against the background is not confirmed, the dielectric 10 It can be determined that the compound contained is amorphous.
- the dielectric 10 includes, for example, a film.
- Dielectric 10 includes, for example, a sputtered film.
- the dielectric 10 tends to have a high dielectric constant and a low dielectric loss tangent.
- the composition ratio of each metal atom in the composite oxide is easily adjusted to a desired value.
- the dielectric 10 may be an anodized film or other thin film.
- Other methods of forming thin films are, for example, vacuum deposition, pulsed laser deposition (PLD), atomic layer deposition (ALD), and chemical vapor deposition (CVD).
- the capacitor 1a further includes a first electrode 21 and a second electrode 22, as shown in FIG.
- the dielectric 10 is arranged on the first electrode 21 .
- the second electrode 22 covers at least part of the dielectric 10 .
- the materials forming the first electrode 21 and the second electrode 22 are not limited to specific materials.
- the first electrode 21 and the second electrode 22 contain metal, for example.
- the first electrode 21 is desirably made of, for example, a conductive metal.
- the first electrode 21 contains, for example, a valve metal. Examples of valve metals are aluminum, tantalum and niobium.
- the first electrode 21 contains, for example, at least one selected from the group consisting of aluminum, tantalum, and niobium as a valve metal.
- the first electrode 21 may contain noble metals such as gold and platinum, or may contain nickel.
- the second electrode 22 is, for example, a conductive metal.
- the second electrode 22 may contain, for example, valve metals such as aluminum, tantalum, and niobium, may contain noble metals such as gold, silver, and platinum, and may contain nickel.
- the second electrode 22 contains, for example, at least one selected from the group consisting of aluminum, tantalum, niobium, gold, silver, platinum, and nickel.
- the first electrode 21 has a main surface 21p.
- “major surface” means the surface of the electrode having the largest area;
- One main surface of the dielectric 10 is in contact with the main surface 21p, for example.
- the second electrode 22 has a major surface 22p parallel to the major surface 21p.
- the other main surface of dielectric 10 is in contact with main surface 22p, for example.
- FIG. 2A is a cross-sectional view showing a capacitor 1b according to another example of the embodiment of the present disclosure.
- Capacitor 1b is configured in the same manner as capacitor 1a, except for parts that are particularly described.
- Components of the capacitor 1b that are the same as or correspond to components of the capacitor 1a are denoted by the same reference numerals, and detailed description thereof is omitted.
- the description regarding the capacitor 1a also applies to the capacitor 1b unless technically contradictory.
- the capacitor 1b at least part of the first electrode 21 is porous.
- the surface area of the first electrode 21 tends to increase, and the capacitance of the capacitor tends to increase.
- a porous structure can be formed, for example, by etching a metal foil and sintering a powder.
- a dielectric 10 film is formed on the surface of the porous portion of the first electrode 21 .
- the anodizing method and ALD can be used as the method of forming the dielectric 10 .
- the second electrode 22 is arranged, for example, so as to fill the gap around the porous portion of the first electrode 21.
- the second electrode 22 may contain, for example, valve metals such as aluminum, tantalum, and niobium, may contain noble metals such as gold, silver, and platinum, and may contain nickel. .
- the second electrode 22 contains, for example, at least one selected from the group consisting of aluminum, tantalum, niobium, gold, silver, platinum, and nickel.
- the capacitors 1a and 1b may be electrolytic capacitors.
- an electrolyte 23 is arranged between the first electrode 21 and the second electrode 22 .
- An electrolyte 23 may be arranged between the dielectric 10 and the second electrode 22 .
- FIG. 2B shows a variant of capacitor 1b configured as an electrolytic capacitor.
- the electrolyte 23 is arranged, for example, so as to fill the voids around the porous portion of the first electrode 21 .
- the electrolyte includes, for example, at least one selected from the group consisting of an electrolytic solution and a conductive polymer.
- conductive polymers are polypyrrole, polythiophene, polyaniline, and derivatives thereof.
- the electrolyte may be a manganese compound such as manganese oxide.
- the electrolyte may contain a solid electrolyte.
- an electrolyte containing a conductive polymer By subjecting raw material monomers to chemical polymerization, electrolytic polymerization, or both chemical polymerization and electrolytic polymerization on the dielectric 10, an electrolyte containing a conductive polymer can be formed.
- An electrolyte containing the conductive polymer may be formed by depositing a solution or dispersion of the conductive polymer on the dielectric 10 .
- FIG. 3A is a diagram schematically showing the electric circuit 3 according to the embodiment of the present disclosure.
- the electrical circuit 3 comprises a capacitor 1a.
- the electric circuit 3 is not limited to a specific circuit as long as it includes the capacitor 1a.
- the electrical circuit 3 may be an active circuit or a passive circuit.
- the electric circuit 3 may be a discharge circuit, a smoothing circuit, a decoupling circuit, or a coupling circuit. Since the electric circuit 3 includes the capacitor 1a, the electric circuit 3 tends to have desired characteristics. For example, noise is likely to be reduced by the capacitor 1 a in the electric circuit 3 .
- the electric circuit 3 may have a capacitor 1b instead of the capacitor 1a.
- FIG. 3B is a diagram schematically showing the circuit board 5 according to the embodiment of the present disclosure.
- the circuit board 5 has a capacitor 1a.
- the circuit board 5 is not limited to a specific circuit board as long as it has the capacitor 1a.
- the circuit board 5 comprises, for example, an electric circuit 3 .
- the circuit board 5 may be an embedded board or a motherboard.
- the circuit board 5 may have a capacitor 1b instead of the capacitor 1a.
- FIG. 3C is a diagram schematically showing the device 7 according to the embodiment of the present disclosure.
- the device 7 comprises a capacitor 1a.
- the device 7 is not limited to a specific device as long as it includes the capacitor 1a.
- the equipment 7 comprises, for example, a circuit board 5 .
- the device 7 may be an electronic device, a communication device, a signal processing device, or a power supply device.
- the device 7 may be a server, an AC adapter, an accelerator, or a flat panel display such as a liquid crystal display (LCD).
- the device 7 may be a USB charger, a solid state drive (SSD), an information terminal such as a PC, a smart phone, a tablet PC, or an Ethernet switch.
- SSD solid state drive
- Sputtering was performed using Ti and Pt as targets to form a lower electrode, which is a laminate of Ti thin films and Pt thin films, on the substrate.
- a Ti thin film was in contact with the substrate.
- Alkali-free glass EAGLE XG manufactured by Corning was used as a substrate.
- the environment of the substrate was maintained at a pressure of 0.3 Pa with argon gas occupying 100% volume. Additionally, the temperature of the substrate was adjusted to 600°C.
- a dielectric film of each sample was formed on the lower electrode by a co-sputtering method using Al 2 O 3 and CeO 2 as targets.
- the co-sputtering conditions were adjusted so that the thickness of the dielectric film was 100 nm.
- the environment of the substrate was kept at a pressure of 0.3 Pa with argon gas occupying 90% volume and oxygen gas occupying 10% volume. Additionally, the substrate was not heated.
- the composition ratio of Al and Ce in each sample was adjusted by adjusting the film formation time by opening and closing the shutter.
- dielectric films according to samples 1 to 9 were obtained.
- sputtering was performed using Pt as a target to form an upper electrode made of Pt having a diameter of 104 ⁇ m and a thickness of 100 nm on the dielectric film. Samples 1 to 9 were thus obtained.
- FIG. 6 shows the XRD patterns of the dielectric films according to samples 1-4.
- FIG. 7 shows the XRD patterns of dielectric films according to samples 5 and 6.
- FIG. 8 shows the XRD patterns of the dielectric films according to samples 7-11. 6, 7, and 8, the vertical axis indicates the diffraction intensity in arbitrary units, and the horizontal axis indicates the diffraction angle.
- the boundary between two adjacent XRD patterns along the vertical axis is marked with a scale indicating zero diffraction intensity.
- Cu-K ⁇ radiation was used as the X-ray source, the voltage was adjusted to 50 kV and the current was adjusted to 100 mA. Measurements were taken using a two-dimensional detector and converted to 2 ⁇ .
- FIG. 4 shows the relationship between the dielectric constant of the dielectric film and the ratio of the number of Ce atoms to the number of Al and Ce atoms.
- the vertical axis indicates the dielectric constant of the dielectric film
- the horizontal axis indicates the ratio of the number of Ce atoms to the number of Al and Ce atoms.
- FIG. 5 shows the relationship between the dielectric loss tangent of the dielectric film and the ratio of the number of Ce atoms to the number of Al and Ce atoms.
- the vertical axis indicates the dielectric loss tangent of the dielectric film
- the horizontal axis indicates the ratio of the number of Ce atoms to the number of Al and Ce atoms.
- the relative permittivity at frequencies of 10 kHz and 1 MHz of the dielectric films according to samples 1 to 4 having an atomic ratio Ce/(Al+Ce) of 0.400 or more and less than 0.900 is 15. .0 is exceeded.
- the dielectric tangents of the dielectric films according to samples 1 to 4 at frequencies of 10 kHz and 1 MHz are very low, less than 0.020.
- FIG. 6 shows X-ray diffraction (XRD) patterns of dielectric films according to samples 1 to 4. As shown in FIG. 6, in the XRD patterns of the dielectric films of Samples 1 to 4, no peaks having a half width of 5° or less and being clear against the background were observed. It can be determined that the compound contained is amorphous. It was suggested that the amorphous dielectric containing the composite oxide satisfies both a high dielectric constant and a low dielectric loss tangent.
- the relative dielectric constants of the dielectric films according to samples 5 and 6 having an atomic ratio Ce/(Al+Ce) of less than 0.300 were less than 15 at frequencies of 10 kHz and 1 MHz.
- the dielectric loss tangents of the dielectric films according to samples 5 and 6 at frequencies of 10 kHz and 1 MHz are very low, less than 0.020. Therefore, it is understood that it is difficult to say that a dielectric containing a composite oxide with an atomic ratio Ce/(Al+Ce) adjusted to be less than 0.300 satisfies both a high dielectric constant and a low dielectric loss tangent. .
- FIG. 7 in the XRD patterns of the dielectric films according to samples 5 and 6, no peak having a half-value width of 5° or less and being clear against the background was confirmed. It can be determined that the compound contained in the film is amorphous.
- the relative permittivity at frequencies of 10 kHz and 1 MHz of the dielectric films according to samples 7 to 11 having an atomic ratio Ce/(Al+Ce) of 0.900 or more is 14 or more, high.
- the dielectric loss tangents of the dielectric films according to samples 7 to 11 at frequencies of 10 kHz and 1 MHz are high, being 0.1 or more. Therefore, it is understood that it is difficult to say that a dielectric containing a composite oxide having an atomic ratio Ce/(Al+Ce) adjusted to 0.900 or more satisfies both a high dielectric constant and a low dielectric loss tangent. .
- FIG. 8 in the XRD patterns of the dielectric films of Samples 7 to 11, no peaks having a half width of 5° or less and being clear against the background were observed. It can be determined that the compound contained in the film is amorphous.
- the dielectric of the present disclosure can be suitably used for electronic components such as electrolytic capacitors.
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Abstract
Description
CexAl1-xOkで表される組成を有し、かつ、アモルファスである複合酸化物を含み、
前記組成において、0.400≦x<0.900の条件が満たされており、kは、前記複合酸化物の電気的中性を保つ値である、
誘電体を提供する。
金属箔の表面のエッチングにより多孔質部を形成できる。多孔質部を有する金属箔を陽極酸化等の化成処理を行って多孔質部の金属骨格の表面に金属酸化物を形成することにより、金属酸化物を誘電体として備えたキャパシタを作製できる。多孔質部は大きな表面積を有するので、キャパシタの静電容量を高めることができる。一方、多孔質部の表面積を拡大することには限界もある。また、キャパシタの用途によっては、多孔質部を有する金属箔をキャパシタの電極として用いることが難しい場合も想定される。キャパシタの誘電損失を低く保つことも重要である。
本開示の第1態様に係る誘電体は、
CexAl1-xOkで表される組成を有し、かつ、アモルファスである複合酸化物を含み、
前記組成において、0.400≦x<0.900の条件が満たされており、kは、前記複合酸化物の電気的中性を保つ値である。
第一電極と、
前記第一電極上に配置された、第1態様から第3態様のいずれか1つに係る誘電体と、
前記誘電体の少なくとも一部を覆う第二電極と、を備えている。
以下、本開示の実施形態について、図面を参照しながら説明する。本開示は、以下の実施形態に限定されない。
Ti及びPtをターゲットとして用いてスパッタリングを行い、Ti薄膜及びPt薄膜の積層体である下部電極を基板上に形成した。Ti薄膜が基板に接触していた。基板として、Corning社製の無アルカリガラスEAGLE XGを用いた。スパッタリングにおいて、基板の環境は、アルゴンガスが100%の体積を占める0.3Paの圧力の条件に保たれた。加えて、基板の温度は600℃に調節された。
リガク社製の蛍光X線分析装置ZSX Primus IVを用いて、上部電極を形成する前に、各サンプルに係る誘電体膜に対して蛍光X線分析を行い、各サンプルに係る誘電体膜における元素の定量分析を行った。定量分析の方法としてファンダメンタル・パラメータ法(FP法)を採用した。定量分析の結果から、各サンプルに係る誘電体膜におけるAl及びCeの原子数に対するCeの原子数の比Ce/(Al+Ce)を決定した。結果を表1に示す。
Bruker社製のX線回折装置D8 Discoverを用いて、上部電極を形成する前に、各サンプルに係る誘電体膜に対してX線回折測定を行い、各誘電体膜の2θ/θスキャンによるXRDパターンを取得した。図6は、サンプル1から4に係る誘電体膜のXRDパターンを示す。図7は、サンプル5及び6に係る誘電体膜のXRDパターンを示す。図8は、サンプル7から11に係る誘電体膜のXRDパターンを示す。図6、図7、及び図8において、縦軸は、任意単位での回折強度を示し、横軸は、回折角を示す。図6、図7、及び図8において、縦軸に沿って隣り合う2つのXRDパターンの境界に回折強度が0であることを示す目盛りが記載されている。測定において、X線源としてCu-Kα線を用い、電圧を50kVに調節し、電流を100mAに調節した。2次元検出器を用いて測定を行い、2θに変換した。
LCRメータを用いて、各サンプルに係る誘電体膜の10kHz及び1MHzにおける比誘電率ε及び誘電正接tanδを測定した。比誘電率は、各サンプルの静電容量を測定し、その静電容量の測定値、誘電体膜の厚み、及び電極面積に基づいて決定した。測定時の周囲温度は25℃であった。結果を表1に示す。図4は、誘電体膜の比誘電率と、Al及びCeの原子数に対するCeの原子数の比との関係を示す。図4において、縦軸は、誘電体膜の比誘電率を示し、横軸は、Al及びCeの原子数に対するCeの原子数の比を示す。図5は、誘電体膜の誘電正接と、Al及びCeの原子数に対するCeの原子数の比との関係を示す。図5において、縦軸は、誘電体膜の誘電正接を示し、横軸は、Al及びCeの原子数に対するCeの原子数の比を示す。
Claims (12)
- CexAl1-xOkで表される組成を有し、かつ、アモルファスである複合酸化物を含み、
前記組成において、0.400≦x<0.900の条件が満たされており、kは、前記複合酸化物の電気的中性を保つ値である、
誘電体。 - 前記誘電体は、スパッタリング膜を含む、請求項1に記載の誘電体。
- 前記誘電体は、キャパシタ用である、請求項1又は2に記載の誘電体。
- 第一電極と、
前記第一電極上に配置された、請求項1から3のいずれか1項に記載の誘電体と、
前記誘電体の少なくとも一部を覆う第二電極と、を備えた、
キャパシタ。 - 前記第一電極の少なくとも一部は、多孔質である、請求項4に記載のキャパシタ。
- 前記第一電極は、弁金属を含む、請求項4又は5に記載のキャパシタ。
- 前記弁金属は、アルミニウム、タンタル、及びニオブからなる群より選ばれる少なくとも1つを含む、請求項6に記載のキャパシタ。
- 前記第二電極は、アルミニウム、タンタル、ニオブ、金、銀、白金、及びニッケルからなる群より選ばれる少なくとも1つを含む、請求項4から7のいずれか1項に記載のキャパシタ。
- 前記第二電極に接している電解質をさらに備え、
前記電解質は、前記多孔質の内部に充填され、かつ、電解液、導電性高分子、及び酸化マンガンからなる群より選ばれる少なくとも1つを含む、
請求項5に記載のキャパシタ。 - 請求項4から9のいずれか1項に記載のキャパシタを備えた、電気回路。
- 請求項4から9のいずれか1項に記載のキャパシタを備えた、回路基板。
- 請求項4から9のいずれか1項に記載のキャパシタを備えた、機器。
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JP2005203529A (ja) | 2004-01-15 | 2005-07-28 | Matsushita Electric Ind Co Ltd | アルミ電解コンデンサ用電極箔の製造方法 |
JP2005244170A (ja) * | 2004-02-28 | 2005-09-08 | Samsung Electronics Co Ltd | 非晶質誘電体膜及びその製造方法 |
JP2012138595A (ja) * | 2012-02-16 | 2012-07-19 | Fujitsu Ltd | 薄膜キャパシタ及びその製造方法、電子装置並びに回路基板 |
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WO2017026247A1 (ja) | 2015-08-12 | 2017-02-16 | 株式会社村田製作所 | コンデンサおよびその製造方法 |
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JPS59134812A (ja) * | 1983-01-20 | 1984-08-02 | 松下電器産業株式会社 | コンデンサを含むセラミツク回路基板 |
JPH0917949A (ja) * | 1995-06-30 | 1997-01-17 | Nec Corp | 高誘電率膜キャパシタ |
JP2005203529A (ja) | 2004-01-15 | 2005-07-28 | Matsushita Electric Ind Co Ltd | アルミ電解コンデンサ用電極箔の製造方法 |
JP2005244170A (ja) * | 2004-02-28 | 2005-09-08 | Samsung Electronics Co Ltd | 非晶質誘電体膜及びその製造方法 |
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WO2017026247A1 (ja) | 2015-08-12 | 2017-02-16 | 株式会社村田製作所 | コンデンサおよびその製造方法 |
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