WO2004044934A1 - 電源ノイズ低減用薄膜コンデンサ - Google Patents
電源ノイズ低減用薄膜コンデンサ Download PDFInfo
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- WO2004044934A1 WO2004044934A1 PCT/JP2003/014305 JP0314305W WO2004044934A1 WO 2004044934 A1 WO2004044934 A1 WO 2004044934A1 JP 0314305 W JP0314305 W JP 0314305W WO 2004044934 A1 WO2004044934 A1 WO 2004044934A1
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- Prior art keywords
- thin film
- capacitor
- power supply
- reducing power
- supply noise
- Prior art date
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- 239000010409 thin film Substances 0.000 title claims abstract description 169
- 239000003990 capacitor Substances 0.000 title claims abstract description 121
- 239000000758 substrate Substances 0.000 claims abstract description 42
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 40
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 35
- 150000001875 compounds Chemical class 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 21
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052745 lead Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 5
- 229910052788 barium Inorganic materials 0.000 claims abstract description 4
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 4
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 4
- 229910052721 tungsten Inorganic materials 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 16
- 239000010408 film Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 14
- 239000013078 crystal Substances 0.000 description 11
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- 229910052761 rare earth metal Inorganic materials 0.000 description 7
- 230000005684 electric field Effects 0.000 description 6
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- 229910000510 noble metal Inorganic materials 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
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- 238000004549 pulsed laser deposition Methods 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 2
- 229910052692 Dysprosium Inorganic materials 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 2
- 229910052693 Europium Inorganic materials 0.000 description 2
- 229910052688 Gadolinium Inorganic materials 0.000 description 2
- 229910052689 Holmium Inorganic materials 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052777 Praseodymium Inorganic materials 0.000 description 2
- 229910052772 Samarium Inorganic materials 0.000 description 2
- 229910052771 Terbium Inorganic materials 0.000 description 2
- 229910052775 Thulium Inorganic materials 0.000 description 2
- 229910052769 Ytterbium Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
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- 101100194326 Caenorhabditis elegans rei-2 gene Proteins 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000001182 laser chemical vapour deposition Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
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Classifications
-
- 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
-
- 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
- H01G4/228—Terminals
-
- 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
- H01G4/33—Thin- or thick-film capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/50—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor for integrated circuit devices, e.g. power bus, number of leads
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/01—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate comprising only passive thin-film or thick-film elements formed on a common insulating substrate
- H01L27/016—Thin-film circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/151—Die mounting substrate
- H01L2924/153—Connection portion
- H01L2924/1531—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface
- H01L2924/15311—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface being a ball array, e.g. BGA
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/19—Details of hybrid assemblies other than the semiconductor or other solid state devices to be connected
- H01L2924/191—Disposition
- H01L2924/19101—Disposition of discrete passive components
- H01L2924/19102—Disposition of discrete passive components in a stacked assembly with the semiconductor or solid state device
- H01L2924/19104—Disposition of discrete passive components in a stacked assembly with the semiconductor or solid state device on the semiconductor or solid-state device, i.e. passive-on-chip
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3011—Impedance
Definitions
- the present invention is not limited to the decoupling capacitor and the bypass capacitor.
- the present invention relates to a thin film capacitor for reducing power supply noise used for purposes such as reducing power supply noise.
- the required power supply impedance is proportional to the drive voltage, and inversely proportional to the number of integrations per LSI, switching current, and drive frequency. Therefore, the power supply impedance must be rapidly reduced with the recent increase in integration, lower voltage, and wider frequency of LSI.
- To reduce the power supply impedance it is necessary to reduce the inductance and increase the capacity of the decoupling capacitor. Therefore, In order to maximize the function of the coupling capacitor, it is necessary to place the decoupling capacitor as close to the LSI as possible to reduce inductance.
- Electrolytic capacitors and multilayer ceramic capacitors are used as decoupling capacitors, but these capacitors are relatively large and physically difficult to install close to the LSI. Therefore, for example, a thin film capacitor as disclosed in Patent Document 1: Japanese Patent Application Publication No. 2001-15382 has been proposed.
- the capacitance at 80 ° C shows a temperature change of 1 to 1000 to 1 000 ppm / ° C compared to the capacitance at 20 ° C, and the temperature characteristics are poor.
- the dielectric constant of these conventional dielectric thin films tends to decrease as the thickness of the dielectric thin film becomes thinner (for example, less than 100 nm). Furthermore, these conventional dielectric thin films also have a problem in their surface smoothness, and there is also a problem that if the thickness of the dielectric thin film is reduced, insulation failure or the like is likely to occur. In other words, conventional thin-film capacitors have a limit in miniaturization and large capacity.
- these conventional dielectric thin films have a problem that when the thickness of the dielectric thin film is reduced, for example, when an electric field of 100 kV / cm is applied, the capacitance is greatly reduced.
- Non-Patent Document 1 “Particle Orientation of Bismuth Layered Ferroelectric Ceramics and Its Application to Piezoelectric and Pyroelectric Materials” Tadashi Takenaka, Kyoto University Doctoral Dissertation (1 984) As shown in Chapter 3, pages 23 to 77, the composition formula is: (B i 2 ⁇ 2 ) 2+ (A m -i B m ⁇ 3 m + i) 2 — or B i 2 A m -i Bm 0 represented by 3m + 3, wherein, a positive number of symbol m is 1-8 in the composition formula, the symbol a is N a, K, Pb, B a, S r, at least that selected from C a and B i A composition in which the symbol B is at least one element selected from the group consisting of Fe, Co, Cr, Ga, Ti, Nb, Ta, Sb, V, Mo and W, is obtained by a sintering method. It is known per se to form a bismuth layered compound di
- the composition represented by the above composition formula was formed into a thin film (eg, 1 ⁇ or less) under any conditions (eg, the relationship between the substrate surface and the degree of c-axis orientation of the compound). Even if it is thin, it can provide a relatively high dielectric constant and low loss even if it is thin, and obtain a thin film with excellent leakage characteristics, improved withstand voltage, excellent temperature characteristics of dielectric constant, and excellent surface smoothness. None was disclosed about what could be done. Disclosure of the invention
- the present invention has been made in view of such circumstances, and is small in size, for example, so that it can be arranged near an LSI, has little change in characteristics even at high temperatures, has little dependence on bias, has a large capacity, and has a large capacity. It is an object of the present invention to provide a capacitor having low dielectric loss and suitable for use as a thin film capacitor for reducing power supply noise, such as a decoupling capacitor and a bypass capacitor.
- the present inventors have conducted intensive studies on the material of the dielectric thin film used for the capacitor and the crystal structure thereof. It has been found that a capacitor suitable for use as a thin film capacitor for reducing power supply noise can be provided by forming a dielectric thin film oriented perpendicular to the surface of a forming substrate. In other words, the present inventor formed a c-axis oriented film of a bismuth layered compound (the thin film normal is parallel to the c-axis) on the substrate surface for forming a thin film, thereby achieving a relatively high dielectric constant and a relatively low dielectric constant. Realizes a dielectric thin film with low loss (low ta ⁇ ⁇ ), excellent dielectric constant temperature characteristics, and excellent surface smoothness I found what I can do.
- a thin film capacitor for power supply noise reduction connected to a power supply and for reducing power supply noise
- the capacitor has a dielectric thin film
- the bismuth layer compound expressed by the formula is represented by (B i 2 Rei_2) 2+ B m O sm + l ) 2 one or B i 2 A m -i B m 0 3m + 3, wherein the composition formula
- the symbol m is a positive number
- the symbol A is Na, K :, at least one element selected from Pb, Ba, Sr, Ca and Bi
- the symbol B is Fe, Co, Cr, Ga, T It is characterized by being at least one element selected from i, Nb, Ta, Sb, V, Mo and W.
- the capacitor is a decoupling capacitor connected in parallel between a power supply and an integrated circuit.
- the capacitor may be a bypass capacitor.
- the capacitor is arranged in contact with an integrated circuit chip (LSI). Since the capacitor of the present invention is small and has excellent temperature characteristics, it can be placed in contact with an integrated circuit chip.
- LSI integrated circuit chip
- the capacitor may be arranged between the LSI and the circuit board. Even when the distance between the LSI and the circuit board is small, the capacitor of the present invention can be arranged between the LSI and the circuit board because it is small.
- the capacitor of the present invention may be embedded and mounted in a concave portion of a circuit board, may be mounted on a surface of the circuit board, may be integrally formed inside the circuit board, and may be a connection socket. May be arranged inside or on the surface. I Even in the case of misalignment, the capacitor of the present invention is small in size and can be placed at any position.
- the capacitor comprises: a lower electrode formed on the thin film forming substrate; a dielectric thin film formed on the lower electrode; and an upper electrode formed on the dielectric thin film.
- a thin film capacitor having: These lower electrode, dielectric thin film and upper electrode are formed on the surface of the thin film forming substrate by a thin film forming method.
- the capacitor may have a laminated structure in which a plurality of the dielectric thin films are laminated via an electrode.
- the capacitor of the present invention is formed on a surface of a substrate for forming a thin film by a thin film forming method, then cut by a dicer or the like, and then formed into a chip to form an integrated circuit, a circuit board (an intermediate circuit board, an intermediate connecting member, or the like). Or a socket or the like.
- the capacitor of the present invention may be formed directly on an LSI, a circuit board, a socket, or the like by a thin film forming method.
- the substrate for forming a thin film is not particularly limited and is preferably a single crystal material, but may be made of an amorphous material or a synthetic resin such as polyimide.
- the lower electrode formed on the substrate for forming a thin film is preferably formed in the [100] orientation. By forming the lower electrode in the [100] direction, the c-axis of the bismuth layered compound constituting the dielectric thin film formed thereon can be oriented perpendicular to the surface of the thin film forming substrate. .
- the bismuth layered compound has a c-axis oriented 100% perpendicular to the thin film forming substrate surface, that is, the bismuth layered compound has a c-axis orientation degree of 100%.
- the degree of c-axis orientation need not necessarily be 100%.
- the bismuth layered compound has a c-axis degree of orientation of 80% or more.
- m in the composition formula constituting the bismuth layered compound is any one of 1 to 7, and more preferably any one of 1 to 5. This is because manufacturing is easy.
- the bismuth layer compound is a rare earth element (Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb). At least one element selected from Lu).
- the method for producing the dielectric thin film of the capacitor according to the present invention is not particularly limited.
- a thin film oriented in the [100] direction such as cubic, tetragonal, orthorhombic, or monoclinic
- B i 2 A m -i B m 0 3m + 3 the symbol m is a positive number in the composition formula, Symbol A is Na, K, Pb, B a , S r, C a And at least one element selected from B i force, and symbol B is at least one element selected from F e, Co, Cr, Ga, T i, Nb, Ta, S b, V, Mo and W It can be manufactured by forming a dielectric thin film having a bismuth layered compound as a main component.
- a dielectric thin film composed of a bismuth layered compound having the above composition and having a c-axis orientation has a relatively high dielectric constant (for example, a dielectric constant of more than 100) and low loss (ta ⁇ ⁇ is 0.02 or less, and has excellent leakage characteristics (for example, the leakage current measured at an electric field strength of 50 kV / cm is 1 X 10 to 7 A / cm 2 or less, and the short-circuit rate is 10% or less).
- the dielectric thin film of the capacitor according to the present invention can maintain a relatively high dielectric constant even when it is thin, and has good surface smoothness. It is also possible to further increase the capacity.
- the capacitor of the present invention has excellent frequency characteristics (for example, a dielectric constant value at a high frequency range of 1 MHz at a specific temperature and a dielectric constant value of 1 kHz at a lower frequency range). (Absolute value: 0.9 to: 1.1), and excellent in voltage characteristics (for example, the value of the dielectric constant at a measurement voltage of 0.4 at a specific frequency and the The ratio of the dielectric constant at a voltage of 5 V to the absolute value is 0.9 to 1.1).
- the capacitor of the present invention has excellent capacitance temperature characteristics (the average rate of change of capacitance with respect to temperature is within ⁇ 200 ppm / ° C at a reference temperature of 25 ° C).
- thin film refers to a film of a material having a thickness of 0.2 ⁇ m to several ⁇ m formed by various thin film forming methods, and the thickness of a film formed by a sintering method. The purpose is to exclude thick film lumps of about 100 m or more.
- the thin film includes not only a continuous film that continuously covers a predetermined region, but also an intermittent film that intermittently covers an arbitrary interval.
- the thin film may be formed on a part of the substrate surface for forming the thin film, or may be formed on the entire surface.
- FIG. 1 is a schematic sectional view of a capacitor according to an embodiment of the present invention.
- FIG. 2 is a circuit diagram showing an application of the capacitor shown in FIG.
- FIG. 3 is a schematic diagram showing an example of an arrangement position of the capacitor shown in FIG.
- FIG. 4 is a graph showing frequency characteristics of the capacitor according to the embodiment of the present invention.
- FIG. 5 is a graph showing the voltage characteristics of the capacitor according to the example of the present invention.
- the thin film capacitor 2 for power supply noise reduction is a thin film capacitor in which a dielectric thin film is formed in a single layer.
- This capacitor 2 may be used as a decoupling capacitor 2a, for example, as shown in FIG. 2, or may be used as a bypass capacitor.
- the decoupling capacitor 2a is It is connected in parallel with the circuit (LSI) 22 to reduce power supply noise. Further, even when the capacitor of the present invention is used as a bypass capacitor, power supply noise can be reduced.
- the capacitor 2 has a thin film forming substrate 4, and a lower electrode thin film 6 is formed on the thin film forming substrate 4. On the lower electrode thin film 6, a dielectric thin film 8 is formed. An upper electrode thin film 10 is formed on the dielectric thin film 8.
- the thin film forming substrate 4 lattice-match well monocrystal (e.g., S r T i O single crystal, MgO single crystal, such as L aA 10 3 single crystal), amorphous material (for example, glass, fused silica, such as S I_ ⁇ 2 ZS i), a synthetic resin (e.g. polyimide resin), other materials (eg, Z R_ ⁇ 2 / S i, C E_ ⁇ composed of 2 / S i, etc.), etc..
- the substrate is formed of a thin film-forming substrate oriented in the [100] direction such as cubic, tetragonal, orthorhombic, or monoclinic.
- the thickness of the thin film forming substrate 4 is not particularly limited, and is, for example, about 10 to 1000 im.
- a thin film forming substrate 4 as the lower electrode film 6 in the case of using the lattice-match well monocrystal for example, conductive oxides such as CaRuOs and S r Ru0 3, or a noble metal such as P t and Ru
- it is composed of a conductive acid or a noble metal oriented in the [100] direction.
- a conductive oxide or a noble metal oriented in the [100] direction can be formed on the surface thereof.
- the lower electrode thin film 6 By forming the lower electrode thin film 6 from a conductive acid or a noble metal oriented in the [100] direction, the orientation of the dielectric thin film 8 formed on the lower electrode thin film 6 in the [001] direction, ie, The c-axis orientation increases.
- a lower electrode thin film 6 is manufactured by a normal thin film forming method. For example, in a physical evaporation method such as a sputtering method or a pulsed laser evaporation method (PLD), a thin film forming the lower electrode thin film 6 is formed.
- the substrate 4 is formed at a temperature of preferably 300 ° C. or higher, more preferably 500 ° C. or higher. Is preferred.
- the lower electrode thin film 6 may be made of, for example, conductive glass such as ITO.
- conductive glass such as ITO.
- the lower electrode thin film 6 oriented in the [100] direction on the surface thereof.
- the c-axis orientation of the dielectric thin film 8 formed on the substrate tends to increase.
- an amorphous material such as glass is used for the thin film forming substrate 4, it is possible to form the dielectric thin film 8 with enhanced c-axis orientation. In this case, it is necessary to optimize the conditions for forming the dielectric thin film 8.
- lower electrode thin films 6 include, for example, noble metals such as gold (Au), palladium (Pd), and silver (Ag) or alloys thereof, and base metals such as nickel (N i) and copper (Cu). Those alloys can be used.
- noble metals such as gold (Au), palladium (Pd), and silver (Ag) or alloys thereof
- base metals such as nickel (N i) and copper (Cu). Those alloys can be used.
- the thickness of the lower electrode thin film 6 is not particularly limited, but is preferably 10 to 1000 ⁇ m, and more preferably about 50 to 100 nm.
- the upper electrode thin film 10 can be made of the same material as the lower electrode thin film 6. Also, the thickness should be the same.
- the dielectric thin film 8 is an example of the composition for a thin film capacitor of the present invention, and has a composition formula: (B i 2 ⁇ 2) 2+ (Am-1 B m 0 3m + l) 2 , or ⁇ ⁇ 2 A It contains a bismuth layered compound represented by m- 1Bm03m + 3 .
- a bismuth layered compound shows a layered structure in which a pair of Bi and O layers sandwiches the upper and lower layers of a layered perovskite layer consisting of a perovskite lattice consisting of (m-1) ABOs. .
- the orientation of the bismuth layered compound in the [001] direction that is, the c-axis orientation
- the dielectric thin film 8 is formed such that the c-axis of the bismuth layered compound is oriented perpendicular to the thin film forming substrate 4.
- the c-axis orientation of the bismuth layered compound is particularly preferably 100%, but the c-axis orientation may not necessarily be 100%, and preferably 80% or more of the bismuth layered compound. More preferably, 90% or more, and even more preferably, 95% or more should be c-axis oriented.
- the bismuth layered compound when the bismuth layered compound is c-axis oriented using the thin film forming substrate 4 made of an amorphous material such as glass, the bismuth layered compound preferably has a c-axis degree of 80% or more. Good.
- the degree of c-axis orientation of the bismuth layered compound is preferably 90% or more, more preferably 95% or more.
- the degree of c- axis orientation (F) of the bismuth layered compound is defined as P 0, which is the X-ray diffraction intensity of the c-axis of a polycrystal that has a completely random orientation.
- P the diffraction intensity
- F (%) (PP 0) / (1 ⁇ P 0)
- P in Equation 1 is the sum of the reflection intensity I (00 1) from the (00 1) plane ⁇ the sum of I (00 1) and the reflection intensity I (hk 1) from each crystal plane (hk 1) ⁇ This is the ratio to I (hk 1) ( ⁇ I (00 1) / ⁇ I (hk 1) ⁇ ), and the same applies to P 0.
- Equation 1 the X-ray diffraction intensity P when the crystal is oriented 100% in the c-axis direction is 1.
- Is F 100%.
- the c-axis of the bismuth layered compound means a direction connecting a pair of (B i 2 ⁇ 2 ) 2+ layers, that is, a [001] direction.
- the symbol m is not particularly limited as long as it is a positive number.
- the symbol m is an even number, since the mirror plane has a mirror plane parallel to the c plane, the components of the spontaneous polarization in the c axis direction cancel each other out from the mirror plane, and the polarization axis is set in the c axis direction. You will not have it. Therefore, the paraelectric property is maintained, the temperature characteristic of the dielectric constant is improved, and a low loss (low ta ⁇ ) is realized.
- the symbol ⁇ is composed of at least one element selected from Na, K, Pb, Ba, Sr, Ca and Bi.
- the symbol A is composed of two or more elements, their ratio is arbitrary.
- the symbol B is composed of at least one element selected from Fe, Co, Cr, Ga, Ti, Nb, Ta, Sb, V, Mo and W.
- the symbol B is composed of two or more elements, their ratio is arbitrary.
- the bismuth layer compound is the formula: Ca x S r - is represented by (1 x) B i 4 T i 4 0 15, x in the chemical formula is 0 ⁇ x ⁇ 1.
- the temperature characteristics are particularly improved.
- the dielectric thin film 8 Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb It is preferable to further include at least one element Re (a rare earth element including Y) selected from L and Lu.
- Re a rare earth element including Y
- the amount of substitution by the rare earth element differs depending on the value of m.
- m 3 in the composition formula: B i 2 AR e x B 3 O, preferably 0.4 ⁇ x ⁇ l.
- the Curie temperature (the phase transition temperature from ferroelectric to paraelectric) of the dielectric thin film 8 is preferably from 100 ° C to 100 ° C, Preferably, it can be kept between 50 ° C and 50 ° C.
- the Curie point is between 100 ° C. and + 100 ° C.
- the dielectric constant of the dielectric thin film 8 increases.
- Curie temperature Can also be measured by DSC (differential scanning calorimetry) or the like.
- DSC differential scanning calorimetry
- composition formula B i 2 A 3 - in x R e x B 4 0 15 , preferably 0. 01 ⁇ x ⁇ 2. 0, more preferably 0. l ⁇ x ⁇ 1.0.
- the dielectric thin film 8 does not have the rare-earth element Re, it has excellent leakage characteristics as described later, but the leakage characteristics can be further improved by Re substitution.
- the dielectric thin film 8 does not have a rare earth element Re, the leakage current measured at the electric field intensity 5 O k V / cm, preferably 1 X 10- 7 A / cm 2 or less, more preferably 5 X 10- 8 a / cm 2 or less and it is possible to, yet short rate, preferably 10% or less, and more preferably 5% or less.
- the dielectric thin film 8 has a rare earth element Re, the leakage current when measured under the same conditions, preferably 5 X 10- 8 A / cm 2 or less, more preferably 1 X 10 one It can be 8 A / cm 2 or less, and the short-circuit rate can be preferably 5% or less, more preferably 3% or less.
- the dielectric thin film 8 is formed using various thin film forming methods such as a vacuum evaporation method, a high frequency sputtering method, a pulsed laser deposition method (PLD), a MOCVD (Metal Organic Chemical Vapor Deposition) method, and a liquid phase method (CSD method). can do.
- a vacuum evaporation method e.g., a vacuum evaporation method, a high frequency sputtering method, a pulsed laser deposition method (PLD), a MOCVD (Metal Organic Chemical Vapor Deposition) method, and a liquid phase method (CSD method).
- PLD pulsed laser deposition method
- MOCVD Metal Organic Chemical Vapor Deposition
- CSD liquid phase method
- a thin film forming substrate oriented in a specific direction (eg, [100] direction) is used.
- the dielectric thin film 8 is formed using a plate or the like. From the viewpoint of reducing the manufacturing cost, it is more preferable to use the thin film forming substrate 4 made of an amorphous material.
- a bismuth layered compound having a specific composition is configured to be c-axis oriented.
- a relatively high dielectric constant and low loss can be provided. Excellent leakage characteristics, improved withstand voltage, excellent temperature characteristics of dielectric constant, and excellent surface smoothness.
- the entire thickness of the capacitor 2 including the thin film forming substrate and the electrode can be reduced to about 10 to 100 ⁇ .
- the dielectric thin film 8 has particularly excellent temperature characteristics at high temperatures, and has a small change in dielectric constant even at high temperatures (for example, 120 ° C.).
- the capacitor 2 having the dielectric thin film 8 is disposed, for example, as a decoupling capacitor between the LSI 22 and the intermediate circuit board 24 in close contact with the LSI, as shown in FIG. It becomes possible.
- the LSI 22 and the intermediate circuit board 24 are connected by solder bumps and the gap tends to be small.However, since the thickness of the capacitor 2 is extremely thin, it is possible to mount it between them become.
- the temperature of the LSI 22 may be high, the dielectric thin film of the capacitor 2 has excellent temperature characteristics. Therefore, there is little change in characteristics even at a high temperature, and the noise reduction effect is excellent.
- the position of the capacitor 2 is not limited to the position between the LSI 22 and the intermediate circuit board 24 shown in FIG. 3, but the position of the circuit board 24 or the motherboard (circuit board) 28 It may be embedded in the recess and mounted, or may be mounted on the surface of the circuit board 24 or 28, may be integrally formed inside the circuit board 24 or 28, and may be a socket for connection. It may be arranged inside 26.
- the capacitor of the present invention since the capacitor of the present invention is small in size, it can be placed anywhere. Since the capacitor of the present invention can be arranged in the vicinity of the LSI as described above, the inductance can be reduced.
- the capacitor of the present invention may be formed directly on the LSI 22, the intermediate circuit board 24, the mother board 28, or the like.
- the dielectric thin film 8 may be laminated in multiple layers on the surface of the thin film forming substrate via an electrode film. Since the dielectric thin film of the capacitor according to the present invention has excellent surface smoothness, even if it is thin, it has excellent insulation and pressure resistance, and can be stacked in a larger number than before.
- a Pt upper electrode thin film having a diameter of 0.1 mm was formed on the surface of these dielectric thin films by a sputtering method, and a thin film capacitor sample was fabricated.
- the electrical characteristics (dielectric constant, & 1 13, loss 0 value, leak current, breakdown voltage) of the obtained capacitor samples and the temperature characteristics of the dielectric constant were evaluated.
- Dielectric constant (no unit) was measured on a capacitor sample using a digital LCR meter (YHP 4274A) at room temperature (25 ° C) and measurement frequency of 100 kHz (AC 2 OmV). It was calculated from the capacitance, the electrode dimensions of the capacitor sample, and the distance between the electrodes.
- Leak current characteristics (unit: AZcm 2 ) were measured at an electric field strength of 50 kV / cm.
- the temperature characteristics of the dielectric constant were measured for the capacitor sample under the above conditions, and when the reference temperature was set to 25 ° C, the dielectric constant with respect to the temperature within the temperature range of _55 to + 150 ° C.
- the average rate of change ( ⁇ ) was measured, and the temperature coefficient (ppm / ⁇ C) was calculated.
- the breakdown voltage (unit: kV / cm) was measured by increasing the voltage in the leak characteristic measurement. table 1
- Example 1 1 [100] [001] 100 m 2> 1000 ⁇ 1X10— 7 230 90
- c-axis oriented film of the bismuth layer compound obtained in Example 1 the breakdown voltage is higher than 1000 k VZcm, leakage current low enough 1 X 10_ 7 or less, a dielectric constant of 200 or more It was confirmed that 1 && 113 was 0.02 or less and the loss Q value was 50 or more. As a result, further thinning can be expected, and a higher capacity as a thin film capacitor can be expected.
- Example 1 Although the temperature coefficient was very small at ⁇ 150 ppm / ° C or less, the dielectric constant was relatively large at 200 or more, and it had excellent basic characteristics as a temperature compensation capacitor material. I was able to confirm that. Further, in Example 1, it was confirmed that the thin film material was suitable for producing a laminated structure because of its excellent surface smoothness. That is, Example 1 confirmed the effectiveness of the c-axis oriented film of the bismuth layered compound.
- the frequency characteristics and the voltage characteristics were evaluated using the thin film capacitor samples manufactured in Example 1.
- the frequency characteristics were evaluated as follows. For the capacitor sample, the frequency was changed from 1 kHz to 1 MHz at room temperature (25 ° C), the capacitance was measured, and the permittivity was calculated. Figure 4 shows the results. An LCR meter was used to measure the capacitance. As shown in Fig. 4, it was confirmed that the value of the dielectric constant did not change even when the frequency at a specific temperature was changed to 1 MHz. That is, it was confirmed that the frequency characteristics were excellent.
- the voltage characteristics were evaluated as follows. For the capacitor sample, the measured voltage (applied voltage) at a specific frequency (100 kHz) was changed from 0.4 IV (electric field strength of 5 kVZcm) to 5 V (electric field strength of 250 kVZcm). The capacitance was measured (measurement temperature was 25 ° C), and the calculated permittivity was shown in Fig. 5. did. An LCR meter was used to measure the capacitance. As shown in Fig. 5, it was confirmed that the value of the dielectric constant did not change even when the measurement voltage at a specific frequency was changed to 5 V. That is, it was confirmed that the voltage characteristics were excellent.
- a metal mask having a predetermined pattern was formed on the dielectric thin film, and an SrRuOa electrode thin film having a thickness of 100 nm was formed as an internal electrode thin film by a pulse laser single vapor deposition method (pattern 2).
- a dielectric thin film having a thickness of 100 nm was formed again as a dielectric thin film on the entire surface of the substrate including the internal electrode thin film by a pulse laser vapor deposition method.
- the electrical properties (dielectric constant, dielectric loss, Q value, leakage current, short-circuit rate) of the obtained capacitor sample were evaluated in the same manner as in Example 1.
- the dielectric constant was 200 and tan ⁇ was 0. 0 2 or less, loss Q value is 5 0 or more, the leakage current is 2 hereinafter 1 X 1 0 a / cm, good results were obtained.
- the temperature coefficient was found to be 120 ppmZ ° C.
- the size is large enough to be placed near the LSI, the characteristic change is small even at high temperature, the dependence on the bias is small, and the large capacity is achieved.
- a capacitor having low dielectric loss and suitable for use as a thin film capacitor for reducing power noise such as a decoupling capacitor and a bypass capacitor.
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Description
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US10/534,728 US20060126267A1 (en) | 2002-11-12 | 2003-11-11 | Thin film capacitor for reducing power supply noise |
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JP2002-328570 | 2002-11-12 | ||
JP2002328570A JP2004165370A (ja) | 2002-11-12 | 2002-11-12 | 電源ノイズ低減用薄膜コンデンサ |
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US (1) | US20060126267A1 (ja) |
JP (1) | JP2004165370A (ja) |
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CN1768403A (zh) * | 2003-02-27 | 2006-05-03 | Tdk株式会社 | 薄膜电容元件用组合物、高介电常数的绝缘膜、薄膜电容元件、薄膜积层电容器、电路和电子仪器 |
US7375412B1 (en) * | 2005-03-31 | 2008-05-20 | Intel Corporation | iTFC with optimized C(T) |
KR100898974B1 (ko) * | 2007-06-18 | 2009-05-25 | 삼성전기주식회사 | 박막 커패시터, 적층구조물 및 그 제조방법 |
US20090073664A1 (en) * | 2007-09-18 | 2009-03-19 | Research In Motion Limited | Decoupling capacitor assembly, integrated circuit/decoupling capacitor assembly and method for fabricating same |
EP2040297A1 (en) * | 2007-09-18 | 2009-03-25 | Research In Motion Limited | Decoupling capacitor assembly, integrated circuit/decoupling capacitor assembly and method for fabricating the same |
US8521631B2 (en) * | 2008-05-29 | 2013-08-27 | Sas Institute Inc. | Computer-implemented systems and methods for loan evaluation using a credit assessment framework |
KR20180069507A (ko) * | 2016-12-15 | 2018-06-25 | 삼성전기주식회사 | 박막 커패시터 |
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JPH07106198A (ja) * | 1993-10-08 | 1995-04-21 | Matsushita Electric Ind Co Ltd | 積層薄膜コンデンサの製造方法 |
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US5403195A (en) * | 1994-05-24 | 1995-04-04 | The Whitaker Corporation | Socket having an auxiliary electrical component mounted thereon |
JP3435966B2 (ja) * | 1996-03-13 | 2003-08-11 | 株式会社日立製作所 | 強誘電体素子とその製造方法 |
US6370013B1 (en) * | 1999-11-30 | 2002-04-09 | Kyocera Corporation | Electric element incorporating wiring board |
CN100431066C (zh) * | 2001-08-28 | 2008-11-05 | Tdk株式会社 | 薄膜电容元件用组合物、高电容率绝缘膜、薄膜电容元件和薄膜叠层电容器 |
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2002
- 2002-11-12 JP JP2002328570A patent/JP2004165370A/ja active Pending
-
2003
- 2003-11-11 US US10/534,728 patent/US20060126267A1/en not_active Abandoned
- 2003-11-11 TW TW092131512A patent/TWI227503B/zh not_active IP Right Cessation
- 2003-11-11 WO PCT/JP2003/014305 patent/WO2004044934A1/ja active Application Filing
Patent Citations (7)
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JPH07106198A (ja) * | 1993-10-08 | 1995-04-21 | Matsushita Electric Ind Co Ltd | 積層薄膜コンデンサの製造方法 |
JPH07245236A (ja) * | 1994-01-13 | 1995-09-19 | Rohm Co Ltd | 誘電体キャパシタおよびその製造方法 |
JPH08253324A (ja) * | 1995-03-10 | 1996-10-01 | Sumitomo Metal Mining Co Ltd | 強誘電体薄膜構成体 |
JPH08306865A (ja) * | 1995-05-11 | 1996-11-22 | Nec Corp | ビスマス系層状強誘電体を用いたキャパシタとその製造方法 |
JPH10294432A (ja) * | 1997-04-21 | 1998-11-04 | Sony Corp | 強誘電体キャパシタ、強誘電体不揮発性記憶装置および強誘電体装置 |
JP2000169297A (ja) * | 1998-09-29 | 2000-06-20 | Sharp Corp | 酸化物強誘電体薄膜の製造方法、酸化物強誘電体薄膜及び酸化物強誘電体薄膜素子 |
JP2001015382A (ja) * | 1999-06-29 | 2001-01-19 | Kyocera Corp | 薄膜コンデンサ |
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JP2004165370A (ja) | 2004-06-10 |
US20060126267A1 (en) | 2006-06-15 |
TW200410270A (en) | 2004-06-16 |
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