US20230115136A1 - Laminated substrate having piezoelectric film, element having piezoelectric film and method for manufacturing this laminated substrate - Google Patents
Laminated substrate having piezoelectric film, element having piezoelectric film and method for manufacturing this laminated substrate Download PDFInfo
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- US20230115136A1 US20230115136A1 US18/082,531 US202218082531A US2023115136A1 US 20230115136 A1 US20230115136 A1 US 20230115136A1 US 202218082531 A US202218082531 A US 202218082531A US 2023115136 A1 US2023115136 A1 US 2023115136A1
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- 239000000758 substrate Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000002585 base Substances 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 239000003513 alkali Substances 0.000 claims abstract description 12
- 229910000484 niobium oxide Inorganic materials 0.000 claims abstract description 12
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052715 tantalum Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000010408 film Substances 0.000 description 315
- 239000013078 crystal Substances 0.000 description 17
- 239000011734 sodium Substances 0.000 description 13
- 238000001514 detection method Methods 0.000 description 10
- 238000004544 sputter deposition Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 239000000523 sample Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 150000002739 metals Chemical class 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- 239000010949 copper Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 239000013077 target material Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
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- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 238000004549 pulsed laser deposition Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910002353 SrRuO3 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- RVLXVXJAKUJOMY-UHFFFAOYSA-N lanthanum;oxonickel Chemical compound [La].[Ni]=O RVLXVXJAKUJOMY-UHFFFAOYSA-N 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- H01L41/1873—
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02015—Characteristics of piezoelectric layers, e.g. cutting angles
- H03H9/02031—Characteristics of piezoelectric layers, e.g. cutting angles consisting of ceramic
-
- H01L41/0805—
-
- H01L41/27—
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/08—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of resonators or networks using surface acoustic waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02015—Characteristics of piezoelectric layers, e.g. cutting angles
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02543—Characteristics of substrate, e.g. cutting angles
- H03H9/02574—Characteristics of substrate, e.g. cutting angles of combined substrates, multilayered substrates, piezoelectrical layers on not-piezoelectrical substrate
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
- H03H9/171—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/05—Manufacture of multilayered piezoelectric or electrostrictive devices, or parts thereof, e.g. by stacking piezoelectric bodies and electrodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/704—Piezoelectric or electrostrictive devices based on piezoelectric or electrostrictive films or coatings
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/704—Piezoelectric or electrostrictive devices based on piezoelectric or electrostrictive films or coatings
- H10N30/706—Piezoelectric or electrostrictive devices based on piezoelectric or electrostrictive films or coatings characterised by the underlying bases, e.g. substrates
- H10N30/708—Intermediate layers, e.g. barrier, adhesion or growth control buffer layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/853—Ceramic compositions
- H10N30/8542—Alkali metal based oxides, e.g. lithium, sodium or potassium niobates
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
- H03H2003/028—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks for obtaining desired values of other parameters
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/07—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base
- H10N30/074—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing
- H10N30/076—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing by vapour phase deposition
Definitions
- the present disclosure relates to a laminated substrate having a piezoelectric film, an element having a piezoelectric film, and a method for manufacturing this laminated substrate.
- a piezoelectric material is utilized widely for a functional electronic component such as a filter device.
- a functional electronic component such as a filter device.
- KNN potassium sodium niobate
- An object of the present disclosure is to provide a piezoelectric film suitable for application to a filter device of a high frequency band, and a related technique thereof.
- a laminated substrate having a piezoelectric film and a related technique thereof including:
- a piezoelectric film suitable for application to a filter device of a high frequency band, and a related technique thereof.
- FIG. 1 is a view showing an example of a cross-sectional structure of a laminated substrate according to an embodiment of the present disclosure.
- FIG. 2 is a view showing a modified example of the cross-sectional structure of the laminated substrate according to an embodiment of the present disclosure.
- FIG. 3 is a schematic constitution view of a piezoelectric film device according to an embodiment of the present disclosure.
- FIG. 4 is a view showing a modified example of the cross-sectional structure of the piezoelectric film device according to an embodiment of the present disclosure.
- FIG. 5 is a view showing a measurement principle of a sound speed of a piezoelectric film according to an embodiment of the present disclosure.
- a laminated substrate 10 is constituted as a laminate including a substrate 1 , a base film 7 provided on the substrate 1 , a piezoelectric film (piezoelectric thin film) 3 provided on the base film 7 , and a top electrode film 4 provided on the piezoelectric film 3 .
- a Si-substrate 1 a having an insulating film 1 d provided on its surface may also be used as the substrate 1 , the insulating film 1 d containing an insulating material other than SiO 2 .
- a Si-substrate 1 a in which Si-(100) plane or Si-(111) plane, etc., is exposed on a surface thereof, namely, a Si-substrate not having the surface oxide film 1 b or the insulating film 1 d may also be used as the substrate 1 .
- an SOI (Silicon On Insulator) substrate, a quartz glass (SiO 2 ) substrate, a gallium arsenide (GaAs) substrate, a sapphire (Al 2 O 3 ) substrate, a metal substrate containing a metal material such as stainless steel may also be used as the substrate 1 .
- the single-crystal Si-substrate 1 a has a thickness of 300 to 1000 ⁇ m for example, and the surface oxide film 1 b has a thickness of 5 to 3000 nm for example.
- the base film 7 can be formed (provided, deposited) using platinum (Pt) for example.
- the base film 7 is a single-crystal film or a poly-crystal film (they are also referred to as Pt-film hereafter).
- crystals constituting the Pt-film are preferentially oriented in (111) plane direction with respect to a surface of the substrate 1 .
- a surface of the Pt-film (a surface which is a base of the piezoelectric film 3 ) is mainly constituted of Pt-(111) plane.
- the Pt-film can be formed using a method such as a sputtering method, or an evaporation method.
- the base film 7 may also be formed using various metals such as gold (Au), ruthenium (Ru), or iridium (Ir), an alloy mainly composed of the above various metals, or a metallic oxide such as strontium ruthenate (SrRuO 3 ) or lanthanum nickel oxide (LaNiO 3 ), etc.
- the adhesion layer 6 can be formed using a method such as a sputtering method, or an evaporation method.
- the base film 7 has a thickness of 100 to 400 nm for example, and the adhesion layer 6 has a thickness of 1 to 200 nm for example.
- the piezoelectric film 3 can be formed (provided, deposited) using alkali niobium oxide which contains for example, potassium (K), sodium (Na), and niobium (Nb), and which is represented by a composition formula of (K 1-x Na x )NbO 3 .
- the piezoelectric film 3 can be formed using potassium sodium niobate (KNN).
- the piezoelectric film 3 is a poly-crystal film of KNN (also referred to as KNN-film 3 hereafter).
- a crystal structure of KNN is a perovskite structure.
- crystals constituting the KNN-film 3 are preferentially oriented in (001) plane direction with respect to the surface of the substrate 1 .
- a surface of the KNN-film 3 (a surface which is a base of the top electrode film 4 ) is mainly constituted of KNN-(001) plane.
- a (001)-orientation ratio of the KNN-film 3 can be 85 % or more.
- the KNN-film 3 can be formed using a method such as a sputtering method, a PLD (Pulsed Laser Deposition) method, or a sol-gel method.
- a composition ratio of the KNN-film 3 can be adjusted by controlling a composition of a target material used during sputtering, for example.
- the target material can be produced by mixing and firing K 2 CO 3 -powder, Na 2 CO 3 -powder, Nb 2 O 5 -powder, etc., for example.
- the composition of the target material can be controlled by adjusting a mixed ratio of K 2 CO 3 -powder, Na 2 CO 3 -powder, Nb 2 O 5 -powder, etc.
- its sound speed is 5100 m/s or more, preferably 5700 m/s or more, and more preferably 5800 m/s or more.
- FIG. 5 shows an example of a measurement principle view of the sound speed by Brillouin Oscillation method.
- the surface of the KNN-film 3 is irradiated with a pump light and a probe light which are femtosecond laser pulsed light for example.
- the pump light is the light for exciting a sound wave in the KNN-film 3 .
- the surface of the KNN-film 3 is irradiated with the pump light vertically to the surface of the KNN-film 3 , to thereby increase locally and instantaneously a temperature in the vicinity of the surface of the KNN-film 3 at an irradiation position of the pump light.
- the sound wave (ultrasonic pulse) is excited in the KNN-film 3 , due to a thermal stress generated at the above position.
- This sound wave is a longitudinal wave which mainly propagates in a vertical direction to the surface of the KNN-film 3 .
- the probe light is the light for irradiating the irradiation position of the pump light on the surface of the KNN-film 3 at a prescribed angle with respect to the surface of the KNN-film 3 .
- a prescribed delay time may be given to the probe light.
- the reflected light of the probe light is continuously detected by a detector, and its reflectance is continuously measured, to thereby obtain a function of a delay time between the pump light and the probe light, and the reflectance of the probe light.
- the reflectance of the reflected light of the probe light is varied, and a peak (echo) occurs.
- the time from the irradiation of the pump light to the occurrence of the peak coincides with a propagation time of the sound wave which propagates in the KNN-film 3 and returns to the surface of the KNN-film 3 .
- the sound speed of the KNN-film 3 can be calculated based on the time between the peaks.
- the sound speed of the KNN-film 3 depends on an orientation state in (001) plane direction of the crystals constituting the KNN-film 3 (also referred to as (001)-orientation state of the KNN-film 3 hereafter).
- the sound speed of the KNN-film 3 increases as the number of crystals oriented in (001) plane direction in the KNN-film 3 increase, namely as the (001)-orientation ratio of the KNN-film 3 becomes higher.
- the sound speed of the KNN-film 3 decreases as the number of the crystals oriented in (001) plane direction in the KNN-film 3 decrease, namely as the (001)-orientation ratio of the KNN-film 3 becomes lower.
- high (001)-orientation ratio of the KNN-film 3 is also called “(001)-high orientation”
- low (001)-orientation ratio of the KNN-film 3 is also called “(001)-low orientation”.
- a mixed gas (Ar/O 2 -mixed gas) of argon (Ar) gas and oxygen (O 2 ) gas is used as an atmosphere gas during sputtering of the KNN-film 3 .
- Ar argon
- O 2 oxygen
- the (001)-orientation state of the KNN-film 3 greatly depends on a partial pressure of H 2 O contained in the atmosphere gas during sputtering.
- the (001)-orientation state tends to be (001)-high orientation when H 2 O-partial pressure is low, and tends to be (001)-low orientation when H 2 O-partial pressure is high.
- the (001)-orientation ratio of the KNN-film 3 can be adjusted by controlling the partial pressure of H 2 O containing in the Ar/O 2 -mixed gas during sputtering.
- the (001)-orientation ratio of the KNN-film 3 can be 85 % or more by adjusting the H 2 O-partial pressure to 1/100 or less, preferably 1 /300 or less of a pressure in a growth atmosphere, for example.
- the sound speed of the KNN-film 3 is preferably fast.
- the sound speed of the KNN-film 3 is 6000 m/s or less for example, due to an upper limit of the (001)-orientation ratio of the KNN-film 3 , or a mixture of inevitable impurities into the KNN-film 3 during formation of the KNN-film 3 , etc.
- of a piezoelectric constant of the KNN-film 3 is 90 pm/V or more for example (
- a thickness of the KNN-film 3 is 0.5 to 5 ⁇ m or less for example.
- the KNN-film 3 may contain an element such as copper (Cu), manganese (Mn), lithium (Li), Ta, antimony (Sb) other than K, Na, Nb in a range of 5 at% or less.
- the top electrode film 4 can be formed (provided, deposited) using various metals such as Pt, Au, aluminum (Al), or Cu, or an alloy of these various metals, for example.
- the top electrode film 4 can be formed using a method such as a sputtering method, an evaporation method, a plating method, or a metal paste method.
- the top electrode film 4 does not greatly affect the crystal structure of the KNN-film 3 unlike the base film 7 . Therefore, a material and a crystal structure of the top electrode film 4 , and a method for forming the top electrode film 4 are not particularly limited.
- An adhesion layer mainly composed of Ti, Ta, TiO 2 , Ni, etc., for example may be formed between the KNN-film 3 and the top electrode film 4 in order to enhance an adhesion between them.
- the top electrode film 4 has a thickness of 100 to 5000 nm for example, and the adhesion layer has a thickness of 1 to 200 nm in a case of forming the adhesion layer.
- FIG. 3 shows a schematic constitution view of a device 30 having the piezoelectric film of the present embodiment (also referred to as piezoelectric film device 30 hereafter).
- the piezoelectric film device 30 is constituted including at least an element 20 having the piezoelectric film (also referred to as piezoelectric film element 20 hereafter) obtained by forming the above laminated substrate 10 into a prescribed shape, and a voltage application means 11 a and a voltage detection means 11 b which are connected to the piezoelectric film element 20 .
- the piezoelectric film element 20 has pattern electrodes obtained by forming the top electrode film 4 into a prescribed pattern.
- the piezoelectric film element 20 has a pair of positive-negative pattern electrodes 4 p 1 which are input-side electrodes, and a pair of positive-negative pattern electrodes 4 p 2 which are output-side electrodes.
- a comb-shaped electrode (IDT: Inter Digital Transducer) is used as the pattern electrodes 4 p 1 and 4 p 2 , for example.
- the piezoelectric film device 30 can function as a filter device such as a SAW filter.
- SAW can excite on the surface of the KNN-film 3 .
- a frequency of excited SAW can be adjusted by adjusting a pitch between the pattern electrodes 4 p 1 , for example. For example, the frequency of SAW becomes high as a pitch of IDT as the pattern electrodes 4 p 1 is short, and the frequency of SAW becomes low as the above pitch is long.
- a voltage is generated between the pattern electrodes 4 p 2 , due to SAW having a prescribed frequency (frequency component) determined according to the pitch of IDT as the pattern electrodes 4 p 2 in the SAW which is excited by the voltage application means 11 a , propagates in the KNN-film 3 , and reaches the pattern electrodes 4 p 2 .
- SAW having a prescribed frequency in the excited SAW can be extracted.
- the “prescribed frequency” as used here can include not only a prescribed frequency but also a prescribed frequency band in which a center frequency is prescribed frequency.
- the base film 7 is formed on any one of main surfaces of the substrate 1 . It is also acceptable to prepare the substrate 1 on which the base film 7 is formed in advance on any one of its main surfaces.
- the KNN-film 3 is formed on the base film 7 using the sputtering method for example.
- the top electrode film 4 is formed on the KNN-film 3 using the sputtering method for example, and therefore the laminated substrate 10 is obtained.
- the laminated substrate 10 is formed into a prescribed shape, for example, the top electrode film 4 is formed into the pattern electrodes 4 p 1 and 4 p 2 by etching, etc., and therefore the piezoelectric film element 20 is obtained.
- the voltage application means 11 a is connected between the pattern electrodes 4 p 1 of the piezoelectric film element 20
- the voltage detection means 11 b is connected between the pattern electrodes 4 p 2 of the piezoelectric film element 20 , and therefore the piezoelectric film device 30 is obtained.
- a resonance frequency of the piezoelectric film device 30 produced by processing the laminated substrate 10 having the KNN-film 3 can be high frequency.
- the piezoelectric film device 30 can be suitably applied to a filter device of a high frequency band compared to a piezoelectric film device obtained by processing a laminated substrate having conventional KNN-film. Namely, since the sound speed of the KNN-film 3 is fast, the piezoelectric film device 30 can suitably function as a high frequency filter.
- the piezoelectric film device When the sound speed of the KNN-film 3 is less than 5100 m/s, it is difficult to use the piezoelectric film device as the high frequency filter, in some cases. Further, even in a case that such a piezoelectric film device can be used as the high frequency filter, a filter property of this high frequency filter becomes low, in some cases.
- the piezoelectric film device 30 can be actuated at a higher frequency without shortening the pitch of the pattern electrodes 4p, when the thickness of the KNN-film 3 is constant. Namely, when the piezoelectric film device 30 capable of actuating at high frequency is produced, it is not necessary to make a minute pattern electrodes 4p.
- the sound speed of the KNN-film 3 can be 5700 m/s or more. Further, the (001)-orientation ratio of the KNN-film 3 is 90 % or more, the sound speed of the KNN-film 3 can be 5800 m/s or more. It is already found by the present inventors that the sound speed of the KNN-film 3 is 5650 m/s when the (001)-orientation ratio of the KNN-film 3 is 78 %, and the sound speed of the KNN-film 3 is 5820 m/s for example when the (001)-orientation ratio of the KNN-film 3 is 92 %.
- the high frequency filter can be a low loss filter, or a reduction of a detecting sensitivity of frequency can be prevented, when the piezoelectric film device 30 is used as the high frequency filter. Namely, since the KNN-film 3 has excellent piezoelectric property, a performance of the piezoelectric film device 30 can be enhanced.
- a piezoelectric film device using a laminated substrate having a piezoelectric film made of aluminum nitride (AlN) (also referred to as AlN-film hereafter), functions as the high frequency filter.
- AlN aluminum nitride
- a piezoelectric film device using a laminated substrate having a piezoelectric film made of lead zirconate titanate (PZT) functions as the high frequency filter.
- PZT lead zirconate titanate
- the PZT-film has the piezoelectric property similar to that of the KNN-film, a sound speed of the PZT-film is slower than that of the KNN-film.
- of a piezoelectric constant of the PZT-film is 90 pm/V or more, the sound speed of the PZT-film is about 4000 to 5000 m/s.
- the present embodiment is not limited to the abovementioned embodiment, and can be modified as the following modified examples.
- the above piezoelectric film device 30 may be applied to a filter device utilizing a bulk acoustic wave.
- the piezoelectric film device 30 may function as a Bulk Acoustic Wave (BAW) filter such as a piezoelectric thin film acoustic resonator (FBAR: Film Bulk Acoustic Resonator).
- BAW Bulk Acoustic Wave
- FBAR piezoelectric thin film acoustic resonator
- FIG. 4 shows a schematic constitution view of a piezoelectric film device 30 A capable of functioning as a FBAR filter. As shown in FIG.
- the piezoelectric film device 30 A is constituted including at least a piezoelectric film element 20 A obtained by forming a laminated substrate 10 A into a prescribed shape, and the voltage application means 11 a and the voltage detection means 11 b which are connected to the piezoelectric film element 20 A.
- the laminated substrate 10 A is constituted as a laminate including the substrate 1 , the bottom electrode film 2 provided on the substrate 1 , the KNN-film (piezoelectric film) 3 provided on the bottom electrode film 2 , and the top electrode film 4 provided on the KNN-film 3 .
- the bottom electrode film 2 can be the same constitution as the above base film 7 .
- the KNN-film 3 has a region where the thickness is thin (also referred to as thin area hereafter).
- the laminated substrate 10 A has a cavity 8 for oscillating freely the KNN-film 3 . In this modified example, the cavity 8 is formed by forming a through hole on the substrate 1 .
- the cavity 8 may be formed after forming the KNN-film 3 and before forming the top electrode film 4 , or may be formed after forming the top electrode film 4 .
- the cavity 8 is not limited to the constitution exemplified in FIG. 4 , and may be publicly-known various constitutions. Further, in the piezoelectric film element 20 A, the top electrode film 4 is not required to be IDT, and the top electrode film 4 may be formed into a prescribed shape (pattern).
- the voltage application means 11 a and the voltage detection means 11 b are connected between the bottom electrode film 2 and the top electrode film 4 , respectively.
- the voltage application means 11 a is connected to the top electrode film 4 located on an area other than the thin area of the KNN-film 3
- the voltage detection means 11 b is connected to the top electrode film 4 located on the thin area of the KNN-film 3 .
- BAW is excited in the KNN-film 3 .
- a frequency of BAW namely, a resonance frequency of the KNN-film 3 can be adjusted by adjusting a thickness of the region other than the thin area of the KNN-film 3 , for example.
- the resonance frequency of the KNN-film 3 (BAW) becomes high as the thickness of the KNN-film 3 becomes thin, and the resonance frequency of the KNN-film 3 becomes low as the thickness of the KNN-film 3 becomes thick.
- a voltage is generated between the bottom electrode film 2 and the top electrode film 4 , due to BAW having a prescribed frequency (frequency component) determined according to the thickness of the thin region of the KNN-film 3 , etc., in the BAW which is excited by the voltage application means 11 a , propagates in the KNN-film 3 , and reaches an out-put side electrode.
- BAW having a prescribed frequency in the excited BAW can be extracted.
- the piezoelectric film device can function as an actuator by connecting the voltage application means between the bottom electrode film (base film) and the top electrode film.
- the KNN-film piezoelectric film
- Various members connected to the piezoelectric film device can be actuated due to the above deformation motion.
- the piezoelectric film device can be applied to a head for an inkjet printer, a MEMS mirror for a scanner, and a vibrator for an ultrasonic generator, etc., for example.
- the piezoelectric film device can function as a sensor by connecting the voltage detection means between the bottom electrode film (base film) and the top electrode film.
- the KNN-film is deformed according to a variation of some physical quantity, a voltage is generated between the bottom electrode film and the top electrode film due to the deformation.
- the piezoelectric film device can be applied to an angular velocity sensor, an ultrasonic sensor, a pressure sensor, and an acceleration sensor, etc., for example.
- the substrate may be removed from the laminated substrate when forming the laminated substrate into the piezoelectric film element, as long as the piezoelectric film device produced using the laminated substrate (piezoelectric film element) is applied to desired applications such as a high frequency filter.
- a laminated substrate having a piezoelectric film including:
- the substrate of the supplementary description 1 wherein an absolute value
- a laminated substrate having a piezoelectric film including:
- the substrate of the supplementary description 3 wherein the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K 1-x Na x )NbO 3 (0 ⁇ x ⁇ 1) and preferentially oriented in (001) plane direction.
- the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K 1-x Na x )NbO 3 (0 ⁇ x ⁇ 1) and preferentially oriented in (001) plane direction.
- the piezoelectric film comprises crystals (alkali niobium oxide) constituting the piezoelectric film, and 85% or more of the crystals are oriented in (001) plane direction.
- an element having a piezoelectric film or a device having a piezoelectric film including:
- an element having a piezoelectric film or a device having a piezoelectric film including:
- an element having a piezoelectric film or a device having a piezoelectric film including:
- an element having a piezoelectric film or a device having a piezoelectric film including:
- a method for manufacturing a laminated substrate having a piezoelectric film including:
- the piezoelectric film having an alkali niobium oxide based perovskite structure represented by a composition formula of (K 1-x Na x )NbO 3 (0 ⁇ x ⁇ 1) and preferentially oriented in (001) plane direction, and having a sound speed of 5100 m/s or more.
- a method for manufacturing a laminated substrate having a piezoelectric film including:
- a piezoelectric film on a substrate interposing a base film, with its sound speed being 5100 m/s or more and its absolute value
- of a piezoelectric constant being 90 pm/V or more.
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Abstract
There is provided a laminated substrate having a piezoelectric film, including: a substrate; and a piezoelectric film provided on the substrate interposing a base film, wherein the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K1-xNax)NbO3 (0<x<1) and preferentially oriented in (001) plane direction, and a sound speed of the piezoelectric film is 5100 m/s or more.
Description
- The present application is a Divisional of U.S. Pat. Application No. 16/628,524, filed on Jan. 3, 2020, which claims priority under 37 U.S.C. § 371 to International Patent Application No. PCT/JP2018/023864, filed Jun. 22, 2018, which claims priority to and the benefit of Japanese Patent Application No. 2017-136447, filed on Jul. 12, 2017. The contents of these applications are hereby incorporated by reference in their entireties.
- The present disclosure relates to a laminated substrate having a piezoelectric film, an element having a piezoelectric film, and a method for manufacturing this laminated substrate.
- A piezoelectric material is utilized widely for a functional electronic component such as a filter device. For example, potassium sodium niobate (KNN) is used as the piezoelectric material (see
patent documents -
- Patent document 1: Japanese Patent Laid Open Publication No.2007-184513
- Patent document 2: Japanese Patent Laid Open Publication No.2008-159807
- An object of the present disclosure is to provide a piezoelectric film suitable for application to a filter device of a high frequency band, and a related technique thereof.
- According to an aspect of the present disclosure, there is provided a laminated substrate having a piezoelectric film and a related technique thereof, including:
- a substrate; and
- a piezoelectric film provided on the substrate interposing a base film,
- wherein the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K1-xNax)NbO3 (0<x<1) and preferentially oriented in (001) plane direction, and
- a sound speed of the piezoelectric film is 5100 m/s or more.
- According to the present disclosure, there is provided a piezoelectric film suitable for application to a filter device of a high frequency band, and a related technique thereof.
-
FIG. 1 is a view showing an example of a cross-sectional structure of a laminated substrate according to an embodiment of the present disclosure. -
FIG. 2 is a view showing a modified example of the cross-sectional structure of the laminated substrate according to an embodiment of the present disclosure. -
FIG. 3 is a schematic constitution view of a piezoelectric film device according to an embodiment of the present disclosure. -
FIG. 4 is a view showing a modified example of the cross-sectional structure of the piezoelectric film device according to an embodiment of the present disclosure. -
FIG. 5 is a view showing a measurement principle of a sound speed of a piezoelectric film according to an embodiment of the present disclosure. - An embodiment of the present disclosure will be described hereafter, with reference to drawings.
- As shown in
FIG. 1 , a laminatedsubstrate 10 according to the present embodiment is constituted as a laminate including asubstrate 1, abase film 7 provided on thesubstrate 1, a piezoelectric film (piezoelectric thin film) 3 provided on thebase film 7, and atop electrode film 4 provided on thepiezoelectric film 3. - As the
substrate 1, a single-crystal silicon (Si)substrate 1 a on which a surface oxide film (SiO2-film) 1 b such as a thermal oxide film or a CVD (Chemical Vapor Deposition) oxide film is provided (formed), namely, a Si-substrate having the surface oxide film, can be used preferably. Further, as shown inFIG. 2 , a Si-substrate 1 a having aninsulating film 1 d provided on its surface may also be used as thesubstrate 1, theinsulating film 1 d containing an insulating material other than SiO2. Further, a Si-substrate 1 a in which Si-(100) plane or Si-(111) plane, etc., is exposed on a surface thereof, namely, a Si-substrate not having thesurface oxide film 1 b or theinsulating film 1 d may also be used as thesubstrate 1. Further, an SOI (Silicon On Insulator) substrate, a quartz glass (SiO2) substrate, a gallium arsenide (GaAs) substrate, a sapphire (Al2O3) substrate, a metal substrate containing a metal material such as stainless steel may also be used as thesubstrate 1. The single-crystal Si-substrate 1 a has a thickness of 300 to 1000 µm for example, and thesurface oxide film 1 b has a thickness of 5 to 3000 nm for example. - The
base film 7 can be formed (provided, deposited) using platinum (Pt) for example. Thebase film 7 is a single-crystal film or a poly-crystal film (they are also referred to as Pt-film hereafter). Preferably, crystals constituting the Pt-film are preferentially oriented in (111) plane direction with respect to a surface of thesubstrate 1. Namely, it is preferable that a surface of the Pt-film (a surface which is a base of the piezoelectric film 3) is mainly constituted of Pt-(111) plane. The Pt-film can be formed using a method such as a sputtering method, or an evaporation method. In addition to Pt, thebase film 7 may also be formed using various metals such as gold (Au), ruthenium (Ru), or iridium (Ir), an alloy mainly composed of the above various metals, or a metallic oxide such as strontium ruthenate (SrRuO3) or lanthanum nickel oxide (LaNiO3), etc. Anadhesion layer 6 mainly composed of titanium (Ti), tantalum (Ta), titanium oxide (TiO2), or nickel (Ni), etc., for example is formed between thesubstrate 1 and thebase film 7 in order to enhance an adhesion between them. Theadhesion layer 6 can be formed using a method such as a sputtering method, or an evaporation method. Thebase film 7 has a thickness of 100 to 400 nm for example, and theadhesion layer 6 has a thickness of 1 to 200 nm for example. - The
piezoelectric film 3 can be formed (provided, deposited) using alkali niobium oxide which contains for example, potassium (K), sodium (Na), and niobium (Nb), and which is represented by a composition formula of (K1-xNax)NbO3. Namely, thepiezoelectric film 3 can be formed using potassium sodium niobate (KNN). A coefficient x [= Na/(K+Na)] in the above composition formula is a value in a range of 0<x<1, preferably 0.4≤x≤0.7. Thepiezoelectric film 3 is a poly-crystal film of KNN (also referred to as KNN-film 3 hereafter). A crystal structure of KNN is a perovskite structure. - Preferably, crystals constituting the KNN-
film 3 are preferentially oriented in (001) plane direction with respect to the surface of thesubstrate 1. Namely, it is preferable that a surface of the KNN-film 3 (a surface which is a base of the top electrode film 4) is mainly constituted of KNN-(001) plane. By forming the KNN-film 3 directly on the Pt-film (base film 7) preferentially oriented in (111) plane direction with respect to the surface of thesubstrate 1, crystals constituting the KNN-film 3 can be easily preferentially oriented in (001) plane direction with respect to the surface of thesubstrate 1. For example, 85 % or more of crystals of a crystal group constituting the KNN-film 3 can be oriented in (001) plane direction with respect to the surface of thesubstrate 1, and thereby a region of 85% or more of the surface of the KNN-film 3 can be KNN-(001) plane. Namely, a (001)-orientation ratio of the KNN-film 3 can be 85 % or more. - The KNN-
film 3 can be formed using a method such as a sputtering method, a PLD (Pulsed Laser Deposition) method, or a sol-gel method. A composition ratio of the KNN-film 3 can be adjusted by controlling a composition of a target material used during sputtering, for example. The target material can be produced by mixing and firing K2CO3-powder, Na2CO3-powder, Nb2O5-powder, etc., for example. In this case, the composition of the target material can be controlled by adjusting a mixed ratio of K2CO3-powder, Na2CO3-powder, Nb2O5-powder, etc. - In the KNN-
film 3, its sound speed is 5100 m/s or more, preferably 5700 m/s or more, and more preferably 5800 m/s or more. - In this specification, the sound speed is measured using Brillouin Oscillation method.
FIG. 5 shows an example of a measurement principle view of the sound speed by Brillouin Oscillation method. As exemplified inFIG. 5 , first, the surface of the KNN-film 3 is irradiated with a pump light and a probe light which are femtosecond laser pulsed light for example. The pump light is the light for exciting a sound wave in the KNN-film 3. Specifically, the surface of the KNN-film 3 is irradiated with the pump light vertically to the surface of the KNN-film 3, to thereby increase locally and instantaneously a temperature in the vicinity of the surface of the KNN-film 3 at an irradiation position of the pump light. The sound wave (ultrasonic pulse) is excited in the KNN-film 3, due to a thermal stress generated at the above position. This sound wave is a longitudinal wave which mainly propagates in a vertical direction to the surface of the KNN-film 3. A part of the sound wave which propagates in the KNN-film 3 toward thebase film 7, is reflected at an interface between the KNN-film 3 and thebase film 7, and returns to the surface (vicinity of the surface) of the KNN-film 3. As a result, the surface of the KNN-film 3 is deformed. The probe light is the light for irradiating the irradiation position of the pump light on the surface of the KNN-film 3 at a prescribed angle with respect to the surface of the KNN-film 3. A prescribed delay time may be given to the probe light. The reflected light of the probe light is continuously detected by a detector, and its reflectance is continuously measured, to thereby obtain a function of a delay time between the pump light and the probe light, and the reflectance of the probe light. When the surface of the KNN-film 3 is deformed by the reflected light of the pump light as described above, the reflectance of the reflected light of the probe light is varied, and a peak (echo) occurs. As a result, the time from the irradiation of the pump light to the occurrence of the peak, coincides with a propagation time of the sound wave which propagates in the KNN-film 3 and returns to the surface of the KNN-film 3. In this embodiment, since a thickness of the KNN-film 3 is already known, the sound speed of the KNN-film 3 can be calculated based on the time between the peaks. - The sound speed of the KNN-
film 3 depends on an orientation state in (001) plane direction of the crystals constituting the KNN-film 3 (also referred to as (001)-orientation state of the KNN-film 3 hereafter). The sound speed of the KNN-film 3 increases as the number of crystals oriented in (001) plane direction in the KNN-film 3 increase, namely as the (001)-orientation ratio of the KNN-film 3 becomes higher. Further, the sound speed of the KNN-film 3 decreases as the number of the crystals oriented in (001) plane direction in the KNN-film 3 decrease, namely as the (001)-orientation ratio of the KNN-film 3 becomes lower. Hereafter, high (001)-orientation ratio of the KNN-film 3 is also called “(001)-high orientation”, and low (001)-orientation ratio of the KNN-film 3 is also called “(001)-low orientation”. - For example, a mixed gas (Ar/O2-mixed gas) of argon (Ar) gas and oxygen (O2) gas is used as an atmosphere gas during sputtering of the KNN-
film 3. However, water existing in a chamber is sometimes mixed in the atmosphere gas although its content is very small. The (001)-orientation state of the KNN-film 3 greatly depends on a partial pressure of H2O contained in the atmosphere gas during sputtering. The (001)-orientation state tends to be (001)-high orientation when H2O-partial pressure is low, and tends to be (001)-low orientation when H2O-partial pressure is high. The (001)-orientation ratio of the KNN-film 3 can be adjusted by controlling the partial pressure of H2O containing in the Ar/O2-mixed gas during sputtering. The (001)-orientation ratio of the KNN-film 3 can be 85 % or more by adjusting the H2O-partial pressure to 1/100 or less, preferably 1/300 or less of a pressure in a growth atmosphere, for example. - When a later-described
piezoelectric film device 30 produced by processing thelaminated substrate 10, functions as a filter device of a high frequency band, the sound speed of the KNN-film 3 is preferably fast. However, according to a current state of the art, the sound speed of the KNN-film 3 is 6000 m/s or less for example, due to an upper limit of the (001)-orientation ratio of the KNN-film 3, or a mixture of inevitable impurities into the KNN-film 3 during formation of the KNN-film 3, etc. - An absolute value |d31| of a piezoelectric constant of the KNN-
film 3 is 90 pm/V or more for example (|d31|≥90 pm/V), preferably 100 pm/V or more (|d31|≥100 pm/V). A thickness of the KNN-film 3 is 0.5 to 5 µm or less for example. - The KNN-
film 3 may contain an element such as copper (Cu), manganese (Mn), lithium (Li), Ta, antimony (Sb) other than K, Na, Nb in a range of 5 at% or less. - The
top electrode film 4 can be formed (provided, deposited) using various metals such as Pt, Au, aluminum (Al), or Cu, or an alloy of these various metals, for example. Thetop electrode film 4 can be formed using a method such as a sputtering method, an evaporation method, a plating method, or a metal paste method. Thetop electrode film 4 does not greatly affect the crystal structure of the KNN-film 3 unlike thebase film 7. Therefore, a material and a crystal structure of thetop electrode film 4, and a method for forming thetop electrode film 4 are not particularly limited. An adhesion layer mainly composed of Ti, Ta, TiO2, Ni, etc., for example may be formed between the KNN-film 3 and thetop electrode film 4 in order to enhance an adhesion between them. Thetop electrode film 4 has a thickness of 100 to 5000 nm for example, and the adhesion layer has a thickness of 1 to 200 nm in a case of forming the adhesion layer. -
FIG. 3 shows a schematic constitution view of adevice 30 having the piezoelectric film of the present embodiment (also referred to aspiezoelectric film device 30 hereafter). Thepiezoelectric film device 30 is constituted including at least anelement 20 having the piezoelectric film (also referred to aspiezoelectric film element 20 hereafter) obtained by forming the abovelaminated substrate 10 into a prescribed shape, and a voltage application means 11 a and a voltage detection means 11 b which are connected to thepiezoelectric film element 20. - The
piezoelectric film element 20 has pattern electrodes obtained by forming thetop electrode film 4 into a prescribed pattern. Thepiezoelectric film element 20 has a pair of positive-negative pattern electrodes 4 p 1 which are input-side electrodes, and a pair of positive-negative pattern electrodes 4 p 2 which are output-side electrodes. A comb-shaped electrode (IDT: Inter Digital Transducer) is used as the pattern electrodes 4 p 1 and 4 p 2, for example. - By connecting the voltage application means 11 a between the pattern electrodes 4 p 1 and connecting the voltage detection means 11 b between the pattern electrodes 4 p 2, the
piezoelectric film device 30 can function as a filter device such as a SAW filter. By applying a voltage between the pattern electrodes 4 p 1 using the voltage application means 11 a, SAW can excite on the surface of the KNN-film 3. A frequency of excited SAW can be adjusted by adjusting a pitch between the pattern electrodes 4 p 1, for example. For example, the frequency of SAW becomes high as a pitch of IDT as the pattern electrodes 4 p 1 is short, and the frequency of SAW becomes low as the above pitch is long. A voltage is generated between the pattern electrodes 4 p 2, due to SAW having a prescribed frequency (frequency component) determined according to the pitch of IDT as the pattern electrodes 4 p 2 in the SAW which is excited by the voltage application means 11 a, propagates in the KNN-film 3, and reaches the pattern electrodes 4 p 2. By detecting this voltage using the voltage detection means 11 b, SAW having a prescribed frequency in the excited SAW can be extracted. The “prescribed frequency” as used here can include not only a prescribed frequency but also a prescribed frequency band in which a center frequency is prescribed frequency. - Next, a method for manufacturing the above
laminated substrate 10 will be described. First, thebase film 7 is formed on any one of main surfaces of thesubstrate 1. It is also acceptable to prepare thesubstrate 1 on which thebase film 7 is formed in advance on any one of its main surfaces. Next, the KNN-film 3 is formed on thebase film 7 using the sputtering method for example. Thereafter, thetop electrode film 4 is formed on the KNN-film 3 using the sputtering method for example, and therefore thelaminated substrate 10 is obtained. Then, thelaminated substrate 10 is formed into a prescribed shape, for example, thetop electrode film 4 is formed into the pattern electrodes 4 p 1 and 4 p 2 by etching, etc., and therefore thepiezoelectric film element 20 is obtained. Further, the voltage application means 11 a is connected between the pattern electrodes 4 p 1 of thepiezoelectric film element 20, and the voltage detection means 11 b is connected between the pattern electrodes 4 p 2 of thepiezoelectric film element 20, and therefore thepiezoelectric film device 30 is obtained. - According to the present embodiment, one or more of the following effects can be obtained.
- (a) Since the sound speed of the KNN-
film 3 is 5100 m/s or more, a resonance frequency of thepiezoelectric film device 30 produced by processing thelaminated substrate 10 having the KNN-film 3 can be high frequency. Thereby, thepiezoelectric film device 30 can be suitably applied to a filter device of a high frequency band compared to a piezoelectric film device obtained by processing a laminated substrate having conventional KNN-film. Namely, since the sound speed of the KNN-film 3 is fast, thepiezoelectric film device 30 can suitably function as a high frequency filter. - When the sound speed of the KNN-
film 3 is less than 5100 m/s, it is difficult to use the piezoelectric film device as the high frequency filter, in some cases. Further, even in a case that such a piezoelectric film device can be used as the high frequency filter, a filter property of this high frequency filter becomes low, in some cases. - (b) Since the sound speed of the KNN-
film 3 is 5100 m/s or more, thepiezoelectric film device 30 can be actuated at a higher frequency without shortening the pitch of the pattern electrodes 4p, when the thickness of the KNN-film 3 is constant. Namely, when thepiezoelectric film device 30 capable of actuating at high frequency is produced, it is not necessary to make a minute pattern electrodes 4p. - (c) Since the (001)-orientation ratio of the KNN-
film 3 is 85% or more, the sound speed of the KNN-film 3 can be 5700 m/s or more. Further, the (001)-orientation ratio of the KNN-film 3 is 90 % or more, the sound speed of the KNN-film 3 can be 5800 m/s or more. It is already found by the present inventors that the sound speed of the KNN-film 3 is 5650 m/s when the (001)-orientation ratio of the KNN-film 3 is 78 %, and the sound speed of the KNN-film 3 is 5820 m/s for example when the (001)-orientation ratio of the KNN-film 3 is 92 %. - (d) Since the absolute value |d31| of the piezoelectric constant of the KNN-
film 3 is 90pm/V or more, the high frequency filter can be a low loss filter, or a reduction of a detecting sensitivity of frequency can be prevented, when thepiezoelectric film device 30 is used as the high frequency filter. Namely, since the KNN-film 3 has excellent piezoelectric property, a performance of thepiezoelectric film device 30 can be enhanced. - Here, for reference, conventional laminated substrate using for the high frequency filter will be described.
- Conventionally, for example, a piezoelectric film device using a laminated substrate having a piezoelectric film made of aluminum nitride (AlN) (also referred to as AlN-film hereafter), functions as the high frequency filter. However, there is a problem as follows: although a sound speed of the AlN-film is faster than that of the KNN-film, an absolute value |d31| of a piezoelectric constant of the AlN-film is smaller than that of the KNN-film. For example, although the sound speed of the AlN-film is 10000 m/s or more, the absolute value |d31| of the piezoelectric constant of the AlN-film is about 5 pm/V. Therefore, when this piezoelectric film device functions as the high frequency filter, this filter becomes low performance filter.
- Further, for example, it is also conceivable that a piezoelectric film device using a laminated substrate having a piezoelectric film made of lead zirconate titanate (PZT) (also referred to as PZT-film hereafter), functions as the high frequency filter. However, there is a problem as follows: although the PZT-film has the piezoelectric property similar to that of the KNN-film, a sound speed of the PZT-film is slower than that of the KNN-film. For example, although an absolute value |d31| of a piezoelectric constant of the PZT-film is 90 pm/V or more, the sound speed of the PZT-film is about 4000 to 5000 m/s. Therefore, it is necessary to make a minute pitch between the pattern electrodes compared to the pitch of the piezoelectric film device having the above KNN-film, in order to function the piezoelectric film device having the PZT-film as the high frequency filter. There is also a problem as follows: since the pitch of the pattern electrodes in the high frequency filter is micrometer (µm) order, in the piezoelectric film device having the PZT-film, it is very difficult to make a minute pitch between the pattern electrodes with high accuracy.
- The present embodiment is not limited to the abovementioned embodiment, and can be modified as the following modified examples.
- The above
piezoelectric film device 30 may be applied to a filter device utilizing a bulk acoustic wave. For example, thepiezoelectric film device 30 may function as a Bulk Acoustic Wave (BAW) filter such as a piezoelectric thin film acoustic resonator (FBAR: Film Bulk Acoustic Resonator).FIG. 4 shows a schematic constitution view of apiezoelectric film device 30A capable of functioning as a FBAR filter. As shown inFIG. 4 , thepiezoelectric film device 30A is constituted including at least apiezoelectric film element 20A obtained by forming alaminated substrate 10A into a prescribed shape, and the voltage application means 11 a and the voltage detection means 11 b which are connected to thepiezoelectric film element 20A. - The
laminated substrate 10A is constituted as a laminate including thesubstrate 1, thebottom electrode film 2 provided on thesubstrate 1, the KNN-film (piezoelectric film) 3 provided on thebottom electrode film 2, and thetop electrode film 4 provided on the KNN-film 3. Thebottom electrode film 2 can be the same constitution as theabove base film 7. The KNN-film 3 has a region where the thickness is thin (also referred to as thin area hereafter). Further, thelaminated substrate 10A has acavity 8 for oscillating freely the KNN-film 3. In this modified example, thecavity 8 is formed by forming a through hole on thesubstrate 1. Thecavity 8 may be formed after forming the KNN-film 3 and before forming thetop electrode film 4, or may be formed after forming thetop electrode film 4. Thecavity 8 is not limited to the constitution exemplified inFIG. 4 , and may be publicly-known various constitutions. Further, in thepiezoelectric film element 20A, thetop electrode film 4 is not required to be IDT, and thetop electrode film 4 may be formed into a prescribed shape (pattern). - In the
piezoelectric film device 30A, the voltage application means 11 a and the voltage detection means 11 b are connected between thebottom electrode film 2 and thetop electrode film 4, respectively. In this modified example, the voltage application means 11 a is connected to thetop electrode film 4 located on an area other than the thin area of the KNN-film 3, and the voltage detection means 11 b is connected to thetop electrode film 4 located on the thin area of the KNN-film 3. - By applying a voltage between the
bottom electrode film 2 and thetop electrode film 4 using the voltage application means 11 a, BAW is excited in the KNN-film 3. A frequency of BAW, namely, a resonance frequency of the KNN-film 3 can be adjusted by adjusting a thickness of the region other than the thin area of the KNN-film 3, for example. The resonance frequency of the KNN-film 3 (BAW) becomes high as the thickness of the KNN-film 3 becomes thin, and the resonance frequency of the KNN-film 3 becomes low as the thickness of the KNN-film 3 becomes thick. A voltage is generated between thebottom electrode film 2 and thetop electrode film 4, due to BAW having a prescribed frequency (frequency component) determined according to the thickness of the thin region of the KNN-film 3, etc., in the BAW which is excited by the voltage application means 11 a, propagates in the KNN-film 3, and reaches an out-put side electrode. By detecting this voltage using the voltage detection means 11 b, BAW having a prescribed frequency in the excited BAW can be extracted. - In this modified example as well, the similar effect as the above embodiment can be obtained. Further, in this modified example, namely, in BAW filter, since it is not necessary to form the
top electrode film 4 into IDT, a minute processing of thetop electrode film 4 is not required. Further, since BAW filter does not have IDT, it is easy to produce a filter with lower loss and higher electric power resistance than SAW filter. - As described above, explanation has been given specifically for the embodiments of the present disclosure. However, the present disclosure is not limited thereto, and can be variously modified in a range not departing from the gist of the disclosure.
- For example, the piezoelectric film device according to the above embodiment can function as an actuator by connecting the voltage application means between the bottom electrode film (base film) and the top electrode film. By applying a voltage between the bottom electrode film and the top electrode film using the voltage application means, the KNN-film (piezoelectric film) can be deformed. Various members connected to the piezoelectric film device can be actuated due to the above deformation motion. In this case, the piezoelectric film device can be applied to a head for an inkjet printer, a MEMS mirror for a scanner, and a vibrator for an ultrasonic generator, etc., for example.
- Further, for example, the piezoelectric film device according to the above embodiment can function as a sensor by connecting the voltage detection means between the bottom electrode film (base film) and the top electrode film. When the KNN-film is deformed according to a variation of some physical quantity, a voltage is generated between the bottom electrode film and the top electrode film due to the deformation. By detecting this voltage using the voltage detection means, the physical quantity applied to the KNN-film can be measured. In this case, the piezoelectric film device can be applied to an angular velocity sensor, an ultrasonic sensor, a pressure sensor, and an acceleration sensor, etc., for example.
- Further, in the above embodiment, the substrate may be removed from the laminated substrate when forming the laminated substrate into the piezoelectric film element, as long as the piezoelectric film device produced using the laminated substrate (piezoelectric film element) is applied to desired applications such as a high frequency filter.
- Preferable aspects of the present disclosure will be supplementarily described hereafter.
- According to an aspect of the present disclosure, there is provided a laminated substrate having a piezoelectric film, including:
- a substrate; and
- a piezoelectric film provided on the substrate interposing a base film,
- wherein the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K1-xNax)NbO3 (0<x<1) and preferentially oriented in (001) plane direction, and
- a sound speed of the piezoelectric film is 5100 m/s or more.
- Preferably, there is provided the substrate of the
supplementary description 1, wherein an absolute value |d31| of a piezoelectric constant of the piezoelectric film is 90 pm/V or more. - According to another aspect of the present disclosure, there is provided a laminated substrate having a piezoelectric film, including:
- a substrate; and
- a piezoelectric film on the substrate interposing a base film,
- wherein a sound speed of the piezoelectric film is 5100 m/s or more, and an absolute value |d31| of a piezoelectric constant of the piezoelectric film is 90 pm/V or more.
- Preferably, there is provided the substrate of the
supplementary description 3, wherein the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K1-xNax)NbO3 (0<x<1) and preferentially oriented in (001) plane direction. - Preferably, there is provided the substrate of any one of the
supplementary descriptions 1 to 4, wherein the sound speed of the piezoelectric film is 5700 m/s or more. - Preferably, there is provided the substrate of any one of the
supplementary descriptions 1 to 5, wherein the piezoelectric film comprises crystals (alkali niobium oxide) constituting the piezoelectric film, and 85% or more of the crystals are oriented in (001) plane direction. - Preferably, there is provided the substrate of any one of the
supplementary descriptions 1 to 6, wherein a thickness of the piezoelectric film is 0.5 µm or more and 5 µm or less. - According to further another aspect of the present disclosure, there is provided an element having a piezoelectric film or a device having a piezoelectric film, including:
- a substrate;
- a piezoelectric film provided on the substrate interposing a base film; and
- an electrode film (pattern electrode film) provided on the piezoelectric film,
- wherein the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K1-xNax)NbO3 (0<x<1) and preferentially oriented in (001) plane direction, and
- a sound speed of the piezoelectric film is 5100 m/s or more.
- According to further another aspect of the present disclosure, there is provided an element having a piezoelectric film or a device having a piezoelectric film, including:
- a substrate;
- a piezoelectric film provided on the substrate interposing a base film; and
- an electrode film (pattern electrode film) provided on the piezoelectric film,
- wherein a sound speed of the piezoelectric film is 5100 m/s or more, and an absolute value |d31| of a piezoelectric constant of the piezoelectric film is 90 pm/V or more.
- According to further another aspect of the present disclosure, there is provided an element having a piezoelectric film or a device having a piezoelectric film, including:
- a substrate;
- a bottom electrode film provided on the substrate;
- a piezoelectric film provided on the bottom electrode film; and
- a top electrode film provided on the piezoelectric film,
- wherein the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K1-xNax)NbO3 (0<x<1) and preferentially oriented in (001) plane direction, and
- a sound speed of the piezoelectric film is 5100 m/s or more.
- According to further another aspect of the present disclosure, there is provided an element having a piezoelectric film or a device having a piezoelectric film, including:
- a substrate;
- a bottom electrode film provided on the substrate;
- a piezoelectric film provided on the bottom electrode film; and
- a top electrode film provided on the piezoelectric film,
- wherein a sound speed of the piezoelectric film is 5100 m/s or more, and an absolute value |d31| of a piezoelectric constant of the piezoelectric film is 90 pm/V or more.
- According to further another aspect of the present disclosure, there is provided a method for manufacturing a laminated substrate having a piezoelectric film, including:
- forming a piezoelectric film on a substrate interposing a base film, the piezoelectric film having an alkali niobium oxide based perovskite structure represented by a composition formula of (K1-xNax)NbO3 (0<x<1) and preferentially oriented in (001) plane direction, and having a sound speed of 5100 m/s or more.
- According to further another aspect of the present disclosure, there is provided a method for manufacturing a laminated substrate having a piezoelectric film, including:
- forming a piezoelectric film on a substrate interposing a base film, with its sound speed being 5100 m/s or more and its absolute value |d31| of a piezoelectric constant being 90 pm/V or more.
-
- 1 Substrate
- 3 Piezoelectric film
- 10 Laminated substrate
Claims (9)
1. A laminated substrate having a piezoelectric film, comprising:
a substrate; and
a piezoelectric film on the substrate interposing a base film,
wherein a sound speed of the piezoelectric film is 5100 m/s or more, and an absolute value |d31| of a piezoelectric constant of the piezoelectric film is 90 pm/V or more.
2. The laminated substrate having a piezoelectric film according to claim 1 , wherein the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K1-xNax)NbO3, wherein 0<x<1, and preferentially oriented in (001) plane direction.
3. The laminated substrate having a piezoelectric film according to claim 1 , wherein the piezoelectric film contains an element of Cu, Mn, Li, Ta, or Sb in a range of 5 at% or less.
4. A piezoelectric film element comprising the substrate having a piezoelectric film according to claim 1 and an electrode film provided on the piezoelectric film.
5. The piezoelectric film element according to claim 4 , wherein the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K1-xNax)NbO3, where 0<x<1, and preferentially oriented in (001) plane direction.
6. The piezoelectric film element according to claim 4 , wherein the piezoelectric film contains an element of Cu, Mn, Li, Ta, or Sb in a range of 5 at% or less.
7. A method for manufacturing the laminated substrate having a piezoelectric film according to claim 1 , the method comprising:
forming a piezoelectric film on a substrate interposing a base film, wherein a sound speed of the piezoelectric film is 5100 m/s or more, and an absolute value |d31| of a piezoelectric constant of the piezoelectric film is 90 pm/V or more.
8. The method according to claim 7 , wherein the piezoelectric film has an alkali niobium oxide based perovskite structure represented by a composition formula of (K1-xNax)NbO3, where 0<x<1, and preferentially oriented in (001) plane direction.
9. The method according to claim 7 , wherein the piezoelectric film contains an element of Cu, Mn, Li, Ta, or Sb in a range of 5 at% or less.
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JP2017136447A JP2019021994A (en) | 2017-07-12 | 2017-07-12 | Laminate board with piezoelectric film, element with piezoelectric film, and method for manufacturing the laminate board with piezoelectric film |
JP2017-136447 | 2017-07-12 | ||
US16/628,524 US11557713B2 (en) | 2017-07-12 | 2018-06-22 | Laminated substrate having piezoelectric film, element having piezoelectric film and method for manufacturing this laminated substrate |
PCT/JP2018/023864 WO2019012960A1 (en) | 2017-07-12 | 2018-06-22 | Laminated substrate provided with piezoelectric film, element provided with piezoelectric film, and method for producing laminated substrate provided with piezoelectric film |
US18/082,531 US20230115136A1 (en) | 2017-07-12 | 2022-12-15 | Laminated substrate having piezoelectric film, element having piezoelectric film and method for manufacturing this laminated substrate |
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PCT/JP2018/023864 Division WO2019012960A1 (en) | 2017-07-12 | 2018-06-22 | Laminated substrate provided with piezoelectric film, element provided with piezoelectric film, and method for producing laminated substrate provided with piezoelectric film |
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WO2019012960A1 (en) | 2019-01-17 |
US20200161533A1 (en) | 2020-05-21 |
US11557713B2 (en) | 2023-01-17 |
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