WO2018097016A1 - 弾性波デバイス - Google Patents
弾性波デバイス Download PDFInfo
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- WO2018097016A1 WO2018097016A1 PCT/JP2017/041165 JP2017041165W WO2018097016A1 WO 2018097016 A1 WO2018097016 A1 WO 2018097016A1 JP 2017041165 W JP2017041165 W JP 2017041165W WO 2018097016 A1 WO2018097016 A1 WO 2018097016A1
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- WIPO (PCT)
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- thin film
- substrate
- acoustic wave
- thickness
- wave device
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- 239000000758 substrate Substances 0.000 claims abstract description 394
- 239000010409 thin film Substances 0.000 claims abstract description 283
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 239
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 215
- 239000013078 crystal Substances 0.000 claims abstract description 81
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 9
- 239000010453 quartz Substances 0.000 claims description 207
- 239000010408 film Substances 0.000 claims description 192
- 238000010897 surface acoustic wave method Methods 0.000 claims description 72
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 54
- 229910013641 LiNbO 3 Inorganic materials 0.000 claims description 21
- 238000001465 metallisation Methods 0.000 claims description 16
- 230000001902 propagating effect Effects 0.000 claims description 7
- 230000000644 propagated effect Effects 0.000 claims description 5
- 239000013013 elastic material Substances 0.000 claims 1
- 229910003327 LiNbO3 Inorganic materials 0.000 abstract 1
- 229910012463 LiTaO3 Inorganic materials 0.000 abstract 1
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 230000008878 coupling Effects 0.000 description 20
- 238000010168 coupling process Methods 0.000 description 20
- 238000005859 coupling reaction Methods 0.000 description 20
- 239000000463 material Substances 0.000 description 18
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 14
- 239000005350 fused silica glass Substances 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 8
- 229910052594 sapphire Inorganic materials 0.000 description 8
- 239000010980 sapphire Substances 0.000 description 8
- 239000011787 zinc oxide Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000005388 borosilicate glass Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 3
- 239000005297 pyrex Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 2
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910020177 SiOF Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
-
- 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
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for 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
- H03H9/02228—Guided bulk acoustic wave devices or Lamb wave devices having interdigital transducers situated in parallel planes on either side of a piezoelectric layer
-
- 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
- H03H9/02551—Characteristics of substrate, e.g. cutting angles of quartz substrates
-
- 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
- H03H9/02559—Characteristics of substrate, e.g. cutting angles of lithium niobate or lithium-tantalate substrates
-
- 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
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02834—Means for compensation or elimination of undesirable effects of temperature influence
-
- 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
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14538—Formation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/25—Constructional features of resonators 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
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
-
- 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
- H03H9/0222—Details of interface-acoustic, boundary, pseudo-acoustic or Stonely wave devices
Definitions
- the present invention relates to an acoustic wave device.
- the filter is required to have good insertion loss, good temperature characteristics, and better steepness, and the resonator is required to have a high Q and a large impedance ratio. Since the value of Q is proportional to the impedance ratio and inversely proportional to the band, Q and the impedance ratio are proportional to each other in almost the same band.
- the surface acoustic wave (SAW) filter depends on the electromechanical coupling coefficient (coupling coefficient) of the piezoelectric substrate used, the LT (LiTaO 3 crystal) having a coupling coefficient necessary for the band of the filter is conventionally used.
- a piezoelectric substrate made of LN (LiNbO 3 crystal) is often used.
- the frequency temperature characteristics (TCF) of these substrates are from ⁇ 40 ppm / ° C. to ⁇ 120 ppm / ° C., which is not very good.
- the theoretical formula of the frequency temperature characteristic (TCF) is defined by the following formula.
- V (T) is the excitation sound speed at the temperature T.
- TCF (f (45 ° C.) ⁇ F (25 ° C.)) / (20 ⁇ f (25 ° C.)).
- f (T) is a frequency to be measured, the resonance frequency and / or anti-resonance frequency is measured in the resonator, and the center frequency is measured in the filter.
- the frequency change amount per 1 ° C. is obtained by dividing the maximum change amount of the frequency within the measurement temperature by the measurement temperature range.
- a combination of LT and LN substrates having a negative TCF and a SiO 2 thin film having a positive TCF is combined to form a SiO 2 thin film / a high-density electrode / LT or LN.
- a surface acoustic wave filter having a substrate structure and further flattening the surface by removing convex portions on the SiO 2 film caused by the electrodes has been developed by the present inventors (see, for example, Non-Patent Document 1). .
- a relatively good TCF of ⁇ 10 ppm / ° C. can be obtained, and the same impedance ratio and Q as the characteristics of the LT or LN substrate alone can be obtained.
- the impedance ratio of this resonator is 60 dB, and Q is about 800.
- the quartz substrate has good frequency-temperature characteristics, but has a small coupling coefficient indicating piezoelectricity, and cannot satisfy the filter band required for smartphones and mobile phones.
- the filter using the bulk wave of the AlN (aluminum nitride) thin film has a resonator Q of 2000, and the filter characteristics are steep compared to the SAW filter, but the frequency temperature characteristic is ⁇ 30 ppm / ° C. Not very good.
- Non-Patent Document 1 a relatively good TCF can be obtained.
- the SiO 2 thin film is a columnar structure polycrystalline film, the Q and impedance ratio of the resonator are LT or LN substrate alone.
- the steepness of the frequency characteristic is still insufficient.
- the present invention has been made paying attention to such a problem, and an object thereof is to provide an elastic wave device that has a good TCF and can increase the Q and impedance ratio of the resonator.
- an acoustic wave device is an acoustic wave device using a surface acoustic wave, and is provided on a substrate containing 70% by mass or more of silicon dioxide (SiO 2 ), and the substrate. And a piezoelectric thin film made of LiTaO 3 crystal or LiNbO 3 crystal, and an interdigital electrode provided in contact with the piezoelectric thin film.
- the piezoelectric thin film includes a piezoelectric thin plate.
- the substrate has a bulk wave shear velocity of 3,400 m / s to 4,800 m / s, which is close to that of LT or LN.
- Many of these substrates are isotropic substrates and have no anisotropy in the X, Y, and Z directions, but a quartz crystal substrate that is a piezoelectric single crystal has anisotropy and therefore has different properties.
- the quartz substrate may be configured such that the speed of sound of the surface acoustic wave propagating is faster than the speed of sound of the surface acoustic wave propagating through the piezoelectric thin film. More preferred.
- the difference in sound velocity is preferably 300 m / s or more, and more preferably 600 m / s or more.
- the surface acoustic wave is a leaky surface acoustic wave (LSAW).
- LSAW leaky surface acoustic wave
- SH sin horizontal
- the surface acoustic wave may be an S wave having a sound speed of 4,500 m / s or more. Whether the used surface acoustic wave is a leaky surface acoustic wave can be theoretically determined from the Euler angle of the substrate.
- a substrate containing 70% by mass or more of silicon dioxide (SiO 2 ) can obtain a positive TCF with respect to surface acoustic waves (SAW). Therefore, in the acoustic wave device according to the present invention, by providing a piezoelectric thin film made of LiTaO 3 crystal (LT) or LiNbO 3 crystal (LN) having a negative TCF on a substrate having a positive TCF, zero ppm Good TCF close to / ° C. can be obtained.
- LT LiTaO 3 crystal
- LN LiNbO 3 crystal
- the piezoelectric thin film made of LT or LN is set to an Euler angle that excites a leaky surface acoustic wave (LSAW), and the substrate is set to an Euler angle having a sound speed that is equal to or faster than the sound speed of the LT or LN LSAW.
- LSAW leaky surface acoustic wave
- the substrate is set to an Euler angle having a sound speed that is equal to or faster than the sound speed of the LT or LN LSAW.
- the acoustic wave device may include a grounded short-circuit electrode and / or an insulating bonding film between the substrate and the piezoelectric thin film.
- a grounded short-circuit electrode and / or an insulating bonding film between the substrate and the piezoelectric thin film may include a grounded short-circuit electrode and / or an insulating bonding film between the substrate and the piezoelectric thin film.
- the bonding film is preferably made of a hard material that does not absorb sound and may be made of, for example, a Si film or a SiO 2 film.
- the interdigital electrode is provided on the piezoelectric thin film so that at least a lower part is embedded in the piezoelectric thin film and / or at least an upper part protrudes from the piezoelectric thin film. Also good. In this case, any structure has excellent characteristics and a high impedance ratio can be obtained. In particular, when the structure is such that the whole or lower part of the interdigital electrode is embedded in the piezoelectric thin film, the speed of sound is increased, which is advantageous for increasing the frequency. In this case, the piezoelectric thin film and the substrate may be electrically short-circuited.
- the substrate preferably contains 80% by mass or more of silicon dioxide (SiO 2 ), more preferably 99% by mass or more and less than 100% by mass, and 100% by mass.
- SiO 2 silicon dioxide
- Fused quartz is more preferable, and it is more preferable that the quartz substrate be a piezoelectric single crystal.
- the substrate may have a sound velocity of propagating surface acoustic waves of 3,400 to 4,800 m / s.
- the substrate may be an isotropic substrate excluding quartz, and the piezoelectric thin film may have a thickness of 0.001 mm or more and less than 0.01 mm.
- the substrate may be a quartz substrate, and the acoustic velocity of the propagated surface acoustic wave may be 4,500 m / s or more, 4,800 m / s or more, or 5,000 m / s or more. Any of these configurations has excellent characteristics, and a good TCF and a high Q and impedance ratio can be obtained.
- the thickness of the piezoelectric thin film is not particular.
- the isotropic substrate excluding quartz does not depend on the propagation direction of elastic waves, but when quartz is used, it has anisotropy, so the azimuth and propagation direction (Euler angle) of the quartz substrate used Depending on the characteristics, selection of a suitable Euler angle is important. In the acoustic wave device according to the present invention, it is desirable to first select an Euler angle in which the power flow angle (PFA) is approximately zero. This is because if the Euler angle deviates greatly from zero, the elastic wave propagates in an oblique direction with the interdigital electrode.
- PFA power flow angle
- the Euler angles of the quartz substrate where the PFA is almost zero are (0 ° ⁇ 5 °, 0 ° -180 °, 40 ° ⁇ 12 °), (10 ° ⁇ 5 °, 0 ° -180 °, 42 ° ⁇ 8) °), (20 ° ⁇ 5 °, 0 ° -180 °, 50 ° ⁇ 8 °), (0 ° ⁇ 5 °, 0 ° -180 °, 0 ° ⁇ 5 °), (10 ° ⁇ 5 °, 0 ° -180 °, 0 ° ⁇ 5 °), (20 ° ⁇ 5 °, 0 ° -180 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° -180 °, 90 ° ⁇ 5) °), (10 ° ⁇ 5 °, 0 ° -180 °, 90 ° ⁇ 5 °), (20 ° ⁇ 5 °,
- the substrate has an Euler angle (0 ° ⁇ 5 °, 0 ° to 125 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° to 36 °).
- the substrate has Euler angles (20 ° ⁇ 5 °, 120 ° ⁇ 10 °, 115 ° ⁇ 10 °), (0 ° ⁇ 5 °, 90 ° ⁇ 5 °, 0 ° ⁇ 10 °), ( 0 ° ⁇ 5 °, 90 ° ⁇ 5 °, 75 ° ⁇ 10 °), (0 ° ⁇ 5 °, 0 ° ⁇ 5 °, 0 ° ⁇ 10 °), (0 ° ⁇ 5 °, 0 ° ⁇ 5 °, 60 ° ⁇ 10 °). In these cases, good TCF is exhibited.
- the substrate has a propagation velocity of the surface acoustic wave of 4,500 m / s or more and an Euler angle of (0 ° ⁇ 5 °, 70 ° to 165 °, 0 (° ⁇ 5 °) or (0 ° ⁇ 5 °, 95 ° to 155 °, 90 ° ⁇ 5 °).
- the sound velocity of the surface acoustic wave propagating in the substrate is 4,800 m / s or more, and the Euler angles are (0 ° ⁇ 5 °, 90 ° to 150 °, 0 ° ⁇ 5 °) or (0 ° ⁇ ).
- 5 °, 103 ° to 140 °, 90 ° ⁇ 5 °) is more preferable, and the substrate has a surface acoustic wave wave velocity of 5,000 m / s or more and a Euler angle of (0 ° ⁇ ). 5 °, 100 ° to 140 °, 0 ° ⁇ 5 °) or (0 ° ⁇ 5 °, 110 ° to 135 °, 90 ° ⁇ 5 °).
- the substrate has an Euler angle (0 ° ⁇ 5 °, 0 ° to 132 °, 0 ° ⁇ 5 °) where Rayleigh wave or TSA of LSAW is positive (0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° -18 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 42 ° -65 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 126 ° -180 ° , 0 ° ⁇ 5 °), and the piezoelectric thin film may be made of LiTaO 3 crystal and the Euler angles may be (0 ° ⁇ 5 °, 82 ° to 148 °, 0 ° ⁇ 5 °).
- the substrate has Euler angles (0 ° ⁇ 5 °, 0 ° -12 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 44 ° -63 °, 0 ° ⁇ 5 °), ( (0 ° ⁇ 5 °, 135 ° to 180 °, 0 ° ⁇ 5 °) is more preferable.
- the piezoelectric thin film preferably has an Euler angle (0 ° ⁇ 5 °, 90 ° to 140 °, 0 ⁇ 5 °). With this combination, a particularly good TCF is obtained.
- the substrate has an Euler angle (0 ° ⁇ 5 °, 0 ° -42 °, 90 ° ⁇ 5 °), in which Rayleigh wave or TSA of LSAW is positive, (0 ° ⁇ 5 °, 170 ° -190 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° -45 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 123 ° -180 ° 90 ° ⁇ 5 °), and the piezoelectric thin film may be made of LiTaO 3 crystal, and the Euler angles may be (0 ° ⁇ 5 °, 80 ° to 148 °, 0 ° ⁇ 5 °).
- the substrate has Euler angles (0 ° ⁇ 5 °, 0 ° to 34 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 126 ° to 180 °, 90 ° ⁇ 5 °). It is more preferable.
- the piezoelectric thin film preferably has an Euler angle (0 ° ⁇ 5 °, 90 ° to 140 °, 0 ° ⁇ 5 °), and more preferably (0 ° ⁇ 5 °, 95 ° to 143 °, 0 ° ⁇ 5 °), and more preferably (0 ° ⁇ 5 °, 103 ° to 125 °, 0 ° ⁇ 5 °).
- the substrate may have Euler angles (1 ° to 39 °, 100 ° to 150 °, 0 ° to 20 °, 70 ° to 120 °, or 160 °) having a high sound velocity LSAW.
- the piezoelectric thin film may be made of LiTaO 3 crystal, and the Euler angles may be (0 ° ⁇ 5 °, 80 ° to 148 °, 0 ° ⁇ 5 °).
- the substrate has an Euler angle with a high sound velocity fast shear of around 5,000 m / s, (20 ° ⁇ 5 °, 120 ° ⁇ 10 °, 115 ° ⁇ 10 °), (0 ° ⁇ 5 °, 90 ° ⁇ 5 °, 0 ° ⁇ 10 °), (0 ° ⁇ 5 °, 90 °, 75 ° ⁇ 10 °), (0 ° ⁇ 5 °, 0 °, 0 ° ⁇ 10 °), (0 ° ⁇ 5 (°, 0 °, 60 ° ⁇ 10 °).
- the substrate has an Euler angle (0 ° ⁇ 5 °, 0 ° -23 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 32 ° -69 °).
- the piezoelectric thin film may be made of LiTaO 3 crystal, and the Euler angles may be (0 ° ⁇ 5 °, 80 ° to 148 °, 0 ° ⁇ 5 °).
- the Euler angles of the substrate are (0 ° ⁇ 5 °, 0 ° -12 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 37 ° -66 °, 0 ° ⁇ 5 °), ( 0 ° ⁇ 5 °, 132 ° -180 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° -50 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 126 ° -180 (°, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° -17 °, 30 ° -60 °), (0 ° ⁇ 5 °, 35 ° -67 °, 30 ° -60 °), ( (0 ° ⁇ 5 °, 123 ° to 180 °, 30 ° to 60 °) are more preferable.
- the piezoelectric thin film is made of LiTaO 3 crystal, and the Euler angles are (90 ° ⁇ 5 °, 90 ° ⁇ 5 °, 33 ° to 55 °), (90 ° ⁇ 5). °, 90 ° ⁇ 5 °, 125 ° to 155 °).
- the piezoelectric thin film is made of LiNbO 3 crystal and has Euler angles (90 ° ⁇ 5 °, 90 ° ⁇ 5 °, 38 ° to 65 °), (90 ° ⁇ 5 °, 90 ° ⁇ 5 °, 118). (° to 140 °).
- the piezoelectric thin film may be made of LiTaO 3 crystal and have a thickness of 0.001 to 2 times the wavelength of the acoustic wave.
- the thickness of the piezoelectric thin film is preferably 0.01 to 0.6 times the wavelength of the elastic wave, more preferably 0.02 to 0.6 times, and further 0.03 times. It is preferably ⁇ 0.4 times, and more preferably 0.03 times to 0.3 times.
- the substrate has an Euler angle (0 ° ⁇ 5 °, 0 ° to 132 °, 0 ° ⁇ 5 °) where Rayleigh wave or TSA of LSAW is positive (0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° -18 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 42 ° -65 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 126 ° -180 ° , 0 ° ⁇ 5 °), the piezoelectric thin film is made of LiNbO 3 crystal, and the Euler angles may be (0 ° ⁇ 5 °, 75 ° to 165 °, 0 ° ⁇ 5 °), Preferably, it may be (0 ° ⁇ 5 °, 100 ° to 160 °, 0 ° ⁇ 5 °).
- the Euler angles of the substrate are (0 ° ⁇ 5 °, 0 ° -12 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 44 ° -63 °, 0 ° ⁇ 5 °), (0 (° ⁇ 5 °, 135 ° to 180 °, 0 ° ⁇ 5 °) are more preferable.
- the piezoelectric thin film preferably has a thickness of 0.001 to 2 times the wavelength of the surface acoustic wave, and more preferably 0.01 to 0.6 times.
- the ratio is more preferably 0.012 to 0.6 times, more preferably 0.02 to 0.5 times, and further preferably 0.03 to 0.33 times.
- the substrate has Euler angles (0 ° ⁇ 5 °, 0 ° to 42 °, 90 ° ⁇ 5 °) (0 °) where Rayleigh wave or LSAW TCF is positive.
- the piezoelectric thin film may be made of LiNbO 3 crystal and have Euler angles (0 ° ⁇ 5 °, 70 ° to 170 °, 0 ° ⁇ 5 °).
- the Euler angles of the substrate are (0 ° ⁇ 5 °, 0 ° to 34 °, 90 ° ⁇ 5 °), (0 ° ⁇ °, 126 ° to 180 °, 90 ° ⁇ 5 °). More preferred.
- the piezoelectric thin film preferably has a thickness of 0.001 to 2 times the wavelength of the surface acoustic wave, and has a thickness of 0.01 to 0.5 times. It is preferably 0.02 to 0.33 times, more preferably 0.06 to 0.3 times.
- the substrate has an Euler angle (1 ° to 39 °, 100 ° to 150 °, 0 ° to 20 °, 70 ° to 120 °, or 160 ° to 180 °).
- the piezoelectric thin film may be made of LiNbO 3 crystal, and the Euler angles may be (0 ° ⁇ 5 °, 95 ° to 160 °, 0 ° ⁇ 5 °).
- the substrate has an Euler angle (1 ° to 39 °, 70 ° to 150 °, 0 ° to 20 °, 70 ° to 120 °, or 160 ° to 180 °), and the piezoelectric thin film is made of LiNbO 3 crystal.
- the Euler angle may be (0 ° ⁇ 5 °, 25 ° to 51 °, 0 ° ⁇ 5 °).
- the substrate has an Euler angle (0 ° ⁇ 5 °, 90 ° to 178 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 80 ° to 160 °).
- the piezoelectric thin film is made of LiNbO 3 crystal
- Euler angles for exciting Rayleigh waves are (0 ° ⁇ 5 °, 35 ° to 70 °, 0 ° ⁇ 5 °) It may be preferably (0 ° ⁇ 5 °, 45 ° to 63 °, 0 ° ⁇ 5 °), and more preferably (0 ° ⁇ 5 °, 48 ° to 60 °, 0 ° ⁇ 5 °).
- the Euler angles of the substrates with positive LSAW and Rayleigh wave TCF are (0 ° ⁇ 5 °, 90 ° to 178 °, 0 ° ⁇ 5 °), and (0 ° ⁇ 5 °, 125 (° to 160 °, 90 ° ⁇ 5 °).
- the substrate has an Euler angle (0 ° ⁇ 5 °, 0 ° -16 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 42 ° -64 °).
- the Euler angles of the substrate are (0 ° ⁇ 5 °, 43 ° to 61 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 147 ° to 180 °, 0 ° ⁇ 5 °), ( 0 ° ⁇ 5 °, 0 ° -15 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 134 ° -180 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° -23) °, 30 ° -60 °), (0 ° ⁇ 5 °, 43 ° -67 °, 30 ° -60 °), (0 ° ⁇ 5 °, 137 ° -180 °, 30 ° -60 °). It
- the substrate has an Euler angle (0 ° ⁇ 5 °, 32 ° to 118 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° to 30 °).
- the piezoelectric thin film is made of LiNbO 3 crystal and has an Euler angle (0 ° ⁇ 5 °, 35 ° to 70 °, 0 ° ⁇ 5 °), more preferably (0 ° ⁇ 5 °, 45 ° to 63 °, 0 ° ⁇ 5 °).
- the Euler angles of the substrate are (0 ° ⁇ 5 °, 40 ° to 102 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° to 17 °, 90 ° ⁇ 5 °), ( (0 ° ⁇ 5 °, 175 ° -180 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 13 ° -130 °, 30 ° -60 °) are more preferable.
- the surface acoustic wave used may be a fundamental mode or a higher order mode.
- the piezoelectric thin film preferably has a thickness of 0.35 to 9.3 times the wavelength of the surface acoustic wave.
- the piezoelectric thin film preferably has a thickness of 0.5 to 9 times the wavelength of the surface acoustic wave. In these cases, a high impedance ratio can be obtained.
- the Euler angles ( ⁇ , ⁇ , ⁇ ) are right-handed systems, and express the cut surface of the substrate and the piezoelectric thin film and the propagation direction of the surface acoustic wave. That is, with respect to the crystal constituting the substrate and the crystal axes X, Y, and Z of LT or LN, the X axis is rotated ⁇ in the counterclockwise direction with the Z axis as the rotation axis to obtain the X ′ axis. Next, the Z ′ axis is obtained by rotating the Z axis counterclockwise by using the X ′ axis as a rotation axis.
- the Z ′ axis is a normal line
- the surface including the X ′ axis is a cut surface of the substrate or the piezoelectric thin film.
- the direction in which the Z ′ axis is the rotation axis and the X ′ axis is rotated ⁇ counterclockwise is the propagation direction of the surface acoustic wave.
- an axis perpendicular to the X ′ axis and the Z ′ axis obtained by moving the Y axis by these rotations is defined as a Y ′ axis.
- 40 ° rotation Y-plate X-direction propagation is expressed as Euler angles (0 °, 130 °, 0 °)
- 40 ° rotation Y-plate 90 ° X-direction propagation Is expressed as Euler angles (0 °, 130 °, 90 °).
- the substrate and the piezoelectric thin film may have not only the above Euler angles but also crystallographically equivalent Euler angles. Even in this case, better TCF and higher Q and impedance ratio characteristics can be obtained. Further, when a substrate or a piezoelectric thin film is cut out at a desired Euler angle, an error of about ⁇ 0.5 ° at maximum may occur with respect to each component of the Euler angle. With respect to the shape of the IDT, an error of about ⁇ 3 ° may occur with respect to the propagation direction ⁇ . Regarding the characteristics of the elastic wave, among the Euler angles of ( ⁇ , ⁇ , ⁇ ), with respect to ⁇ , ⁇ , there is almost no characteristic difference due to a deviation of about ⁇ 5 °.
- an elastic wave device that has a good TCF and can increase the Q and impedance ratio of the resonator.
- the interdigital electrode composed of an aluminum electrode having a thickness of 0.08 wavelength is referred to as Al-IDT.
- A a conventional acoustic wave device made of an Al-IDT / piezoelectric substrate, (b) an acoustic wave device according to an embodiment of the present invention, (c) an acoustic wave device according to an embodiment of the present invention, having a bonding film It is a perspective view which shows a modification.
- the impedance ((a) Al-IDT / (0 °, 110 °, 0 °) LT substrate, (b) Al-IDT / (0 °, 132 °, 0 °) LT substrate of the conventional acoustic wave resonator ( (Z) is a graph showing the frequency characteristics (in the figure, the minimum and maximum frequencies of Z are called the resonance frequency (fr), the anti-resonance frequency (fa), the impedances are called Zr and Za, respectively, and the band is (fa -Fa) / fr, the impedance ratio is expressed as 20 ⁇ LOG (Za / Zr)).
- Al-IDT / (0 ° , 120 °, 0 °) LT thin film (thickness: 0.15 wavelength) / (0 °, 130 °, 0 °) is a graph showing frequency characteristics of impedance (Z) of an acoustic wave resonator having a quartz substrate structure. is there.
- Al-IDT / (0 ° , 110 °, 0 °) LT thin film (thickness 0.15 wavelength) / (0 °, 130 °, 60 °) is a graph showing frequency characteristics of impedance (Z) of an acoustic wave resonator having a quartz substrate structure. is there.
- ( ⁇ , ⁇ , ⁇ ) is a graph showing the ⁇ dependency of sound velocity (Phase velocity) at various ⁇ and ⁇ in a quartz substrate (quartz).
- (0) Rayleigh wave (Rayleigh) and LSAW sound velocity (Phase velocity) in the LT substrate in the figure, solid line (v f ) and broken line (v m ) are the surface of the LT substrate, respectively.
- (c) LSAW TCF, ⁇ dependence of the graph. is there.
- Al-IDT / (0 °, ⁇ , 0 °) LT thin film (thickness 0.15 wavelength) / (0 °, 115 ° to 145 °, 0 °) acoustic wave resonator having crystal substrate structure (a) It is a graph which shows (theta) dependence of a zone
- (a) Al thickness of an acoustic wave resonator having a quartz substrate structure Is a graph showing the ⁇ dependence of the impedance ratio when the Al thickness is 0.08 wavelength and (b) Al thickness is 0.2 wavelength. The broken line shows a characteristic with ripples).
- Al-IDT / (0 °, ⁇ , 0 °) LT thin film (thickness 0.15 wavelength) / (0 °, 100 ° to 175 °, 90 °) acoustic wave resonator having crystal substrate structure (a) It is a graph which shows (theta) dependence of a zone
- Al-IDT / (0 °, 110 °, 0 °) LT thin film / (0 °, 128 °, 90 °) acoustic wave resonator having crystal substrate structure
- Al thickness is 0.08 wavelength and 0.2
- Al-IDT / (0 °, 131 °, 0 °) LN thin film / (0 °, 130 °, 0 °) acoustic wave resonator having quartz substrate structure
- Al thickness is 0.08 wavelength and 0.2
- a graph showing the dependence of the impedance ratio on waves on the ⁇ (A solid line indicates a characteristic without ripple and a broken line indicates a characteristic with ripple between resonance and anti-resonance frequencies).
- FIG. 5 is a graph showing frequency characteristics of impedance (Z) of an acoustic wave resonator having a structure of Al-IDT / (0 °, 110 °, 0 °) LT thin film (thickness: 0.15 wavelength) / fused quartz substrate.
- Al-IDT / (0 °, 110 °, 0 °) LT thin film (thickness 0.15 wavelength) / impedance ratio of an acoustic wave resonator having various substrate structures shows the dependency of LT on the film thickness It is a graph.
- Al-IDT / (0 °, 110 °, 0 °) LT thin film / SiO 2 film / high sound velocity substrate and Al-IDT / (0 °, 131 °, 0 °) LN thin film / SiO 2 film / high sound velocity acoustic wave resonator having a structure of the substrate is a graph showing the film thickness dependency of the SiO 2 film in the impedance ratio of the LSAW.
- FIG. 33 Each of the acoustic wave resonators having the structures shown in FIGS.
- 5A is a graph showing the LT film thickness dependence of (a) band (Bandwidth) and (b) impedance ratio (Impedance ratio). (0 °, 110 °, 0 °) LT thin film and (0 °, 132.75 °, 90 °) quartz substrate, and a part or all of Al-IDT is embedded in the LT thin film 4 is a graph showing LT film thickness dependence of the impedance ratio of an acoustic wave resonator having a structure in which Al-IDT is not embedded in an LT thin film.
- Al-IDT / (0 °, 110 °, 0 °) LT thin film (thickness 0.15 wavelength) / bonding film / (0 °, 132.75 °, 90 °) of acoustic wave resonator having the structure of a quartz substrate It is a graph which shows the film thickness dependence of (a) sound velocity (Phase velocity), (b) zone
- Various IDT / (0 °, 110 °, 0 °) LT thin film (thickness 0.15 wavelength) / (0 °, 132.75 °, 90 °) high-order mode of an acoustic wave resonator having a quartz substrate structure 6 is a graph showing the dependence of the impedance ratio on the thickness of the interdigital electrodes of various materials.
- Au-IDT / (0 °, 110 °, 0 °) LT thin film / (0 °, 132.75 °, 90 °) quartz substrate and Au-IDT / (0 °, 110 °, 0 °) LT thin film / Short-circuit electrode / (0 °, 132.75 °, 90 °) is a graph showing the LT film thickness dependence of the impedance ratio of an acoustic wave resonator having a quartz substrate structure.
- FIG. 1B shows an acoustic wave device according to an embodiment of the present invention.
- an acoustic wave device 10 according to an embodiment of the present invention is provided on a substrate 11, a piezoelectric thin film 12 provided on the substrate 11, and the piezoelectric thin film 12. It has an interdigital electrode (IDT) 13.
- IDT interdigital electrode
- the substrate 11 contains 70% by mass or more of SiO 2 .
- the substrate 11 is made of, for example, quartz, Pyrex (registered trademark) glass, fused quartz, borosilicate glass, synthetic quartz, quartz glass, or the like.
- the piezoelectric thin film 12 is made of LiTaO 3 crystal (LT) or LiNbO 3 crystal (LN). In the case of an acoustic wave resonator, it has a reflector 14 composed of a large number of electrode fingers provided so as to sandwich the interdigital electrode 13.
- Each reflector 14 is provided so as to sandwich the interdigital electrode 13 from both sides with a space between the interdigital electrode 13 along the propagation direction of the surface acoustic wave.
- Each reflector 14 has a pair of bus bars and a plurality of electrode fingers extending between the bus bars.
- the pitch of the electrode fingers is substantially the same as the pitch of the electrode fingers of the interdigital electrode 13.
- a conventional acoustic wave device 50 is shown in FIG.
- a conventional acoustic wave device 50 has a structure in which an interdigital electrode (IDT) 52 is formed on a piezoelectric substrate 51 made of LT or LN.
- IDT interdigital electrode
- Each pair of reflectors 53 is provided so as to sandwich the interdigital electrode 52.
- the Euler angles ( ⁇ , ⁇ , ⁇ ) are simply represented by ( ⁇ , ⁇ , ⁇ ).
- the thickness of the piezoelectric thin film 12, the interdigital electrode 13, and the interdigital electrode 52 is represented by the magnification with respect to the wavelength ⁇ of the elastic wave device to be used.
- the substrate 11 a quartz substrate 11 is used unless otherwise specified.
- the Euler angles of the substrate 11 and the piezoelectric thin film 12 described below may be crystallographically equivalent Euler angles.
- an LT thin film (0 °, 110 °, 0 °) in which the piezoelectric thin film 12 and the quartz substrate 11 are combined in the acoustic wave device 10 shown in FIG. 1 (b).
- 12 (thickness 0.15 wavelength) / (0 °, 130 °, 90 °) quartz substrate 11 and (0 °, 120 °, 0 °) LT thin film 12 (thickness 0.15 wavelength) / (0 °,
- the frequency characteristics of the impedance (Z) obtained for each of the Al interdigital electrodes 13 having a thickness of 0.08 wavelength formed on the quartz substrate 11 are shown.
- FIG. 3 In the quartz substrate 11 (0 °, 130 °, 90 °) and the quartz substrate 11 (0 °, 130 °, 0 °), LSAW and Rayleigh waves are excited (FIGS. 5, 7, and 8). 3), the characteristics of FIG. 3 are those using LSAW. SAW when using Rayleigh waves was confirmed with no or only small response.
- FIG. 5 shows the (0 °, 130 °, ⁇ ) crystal substrate 11 obtained for the propagation direction ⁇ dependence of Rayleigh waves and LSAW sound velocity.
- PFA power flow angle
- the LSAW sound speed of the LT thin film 12 used is 4100 m / s, whereas the LSAW sound speed is 3,800 m / s and low sound speed (0 °, 130 °, 30 ° ) And (0 °, 130 °, 60 °) when the Al thickness is 0.08 wavelength, good characteristics cannot be obtained, and the LSAW sound velocity is 5,000 m / s. Good characteristics are obtained when the crystal substrate 11 of (0 °, 130 °, 0 °) and (0 °, 130 °, 90 °) with high and high sound speeds is used. Further, as shown in FIGS.
- the (0 °, 110 °, 0 °) LT substrate and the (0 °, 132 °, 0 °) LT substrate have a larger leakage component. Nevertheless, the characteristic improvement effect is great. From these results, it is considered that a major cause of the improvement in characteristics is that the LSAW leakage component of the LT thin film 12 becomes zero by bonding the quartz substrate 11 having a higher sound speed than the LT thin film 12.
- FIGS. 6A and 6B show (0 °, 132 °, 0 °) LT thin films (thickness 0.15) on (110) plane (001) direction propagation Si substrate and c sapphire substrate having high sound velocity, respectively.
- the frequency characteristics of the obtained impedance (Z) are shown for SAW resonators in which an Al interdigital electrode having a thickness of 0.08 wavelength is formed thereon.
- BW when the Si substrate was used, BW was 4.4% and the impedance ratio was 69 dB.
- FIG. 6B when a sapphire substrate was used, BW was 5.7% and the impedance ratio was 68 dB.
- the characteristics shown in FIGS. 6A and 6B are wide in BW and have an impedance ratio of 5 to 6 dB better than the characteristics of the SAW resonator of the LT substrate alone in FIG.
- the LT thin film 12 / quartz substrate 11 shown in FIG. 3 has better characteristics.
- piezoelectric substrates such as quartz, LT, and LN excite LSAW.
- Si substrates and sapphire substrates have no piezoelectricity, only Rayleigh waves are excited in the SAW mode. From this, it is possible to obtain better characteristics when using the quartz substrate 11 than when using a Si substrate or a sapphire substrate, even though the quartz substrate 11 used uses the same LSAW as the LT thin film 12.
- the Si substrate and the sapphire substrate are considered to be because the transversal velocity of the bulk wave is larger than that of the LT thin film, and Rayleigh waves different from the LSAW of the used LT thin film are used.
- the acoustic velocity of the transverse wave of the bulk wave is close to the piezoelectric thin film 12 such as LT, LN, etc. to be used, and it is good by bonding a substrate with a high sonic velocity whose main component is SH component from the sonic velocity as a base substrate. Characteristics can be obtained.
- FIG. 7 (a) and 7 (b) show (0 °, ⁇ , 0 °) the dependence of the Rayleigh wave and LSAW of the quartz substrate 11 on the speed of sound and the ⁇ of the TCF, respectively.
- FIG. 7C shows the ratio of displacement of the LSAW longitudinal wave displacement component U1, SH component U2, and SV component U3 on the substrate surface.
- 4,500 m / s or more at ⁇ 70 ° to 165 °
- 4,800 m / s or more at ⁇ 90 ° to 150 °
- 5 at ⁇ 100 ° to 140 °.
- a high sound velocity of 000 m / s or more is obtained. Further, as shown in FIG.
- FIG. 8 (a) and 8 (b) show the (0 °, ⁇ , 90 °) dependence of the Rayleigh wave and LSAW of the quartz substrate 11 on the sound velocity and the TCF ⁇ dependency, respectively.
- FIG. 8C shows the displacement ratio of the LSAW longitudinal wave displacement component U1, SH component U2, and SV component U3 on the substrate surface.
- ⁇ 90 ° to 150 °, 4,500 m / s or more
- ⁇ 103 ° to 143 °, 4,800 m / s or more
- ⁇ 110 ° to 135 °, 5
- a high sound velocity of 000 m / s or more is obtained. Further, as shown in FIG.
- FIG. 9 shows the speed of sound of the quartz substrate 11 having various Euler angles.
- (1 A high sound velocity LSAW can be obtained at (° -39 °, 100-150 °, 160-180 °).
- the acoustic wave device it is preferable to use a substrate having a power flow angle near zero (propagation direction in which the tangent to the LSAW propagation direction is zero) so that the LSAW does not propagate obliquely.
- the direction in which the power flow angle is close to zero is (0 ° ⁇ 5 °, ⁇ , 35 ° ⁇ 8 °), (10 ° ⁇ 5 °, ⁇ , 42 ° ⁇ ).
- FIGS. 10A and 10B show the ⁇ dependency of the acoustic velocity and the electromechanical coupling coefficient (coupling coefficient) of Rayleigh waves and LSAW of the (0 °, ⁇ , 0 °) LT substrate.
- FIG. 10C shows the ⁇ dependence of TCF of the LSAW of the (0 °, ⁇ , 0 °) LT substrate.
- the sound velocity Vm at this time (the sound velocity when the substrate surface is electrically short-circuited) is 4,000 to 4,100 m / s.
- the band of the filter depends on the coupling coefficient of the substrate to be used, it is necessary to select a coupling coefficient that satisfies the desired band.
- ⁇ 65 ° to 148 ° having a large coupling coefficient is used. Good characteristics can be obtained by using the quartz substrate 11 which has a sound speed of about 3,700 to 4,100 m / s or higher than that at that time.
- the LCF of the LSAW of the LT substrate is negative and is ⁇ 30 to ⁇ 70 ppm / ° C.
- the LSAW TCF of ⁇ 120 ° to 146 ° used for the LT substrate alone is about ⁇ 33 ppm / ° C., but the crystal substrate 11 having Rayleigh waves or a positive TCF of LSAW, that is, the Rayleigh shown in FIG. 8 (0 °, 0 ° to 130 °, 0 °), LSAW crystal substrate 11 (0 °, 132 ° to 180 °, 0 °), or (0 °, 0) of Rayleigh wave shown in FIG.
- FIG. 12A shows an Al thickness of 0.08 wavelength
- FIG. 12B shows an Al thickness of 0.2 wavelength (0 °, 110 °, 0 °) LT thin film 12 (thickness 0.15).
- Wavelength) / (0 °, ⁇ , 0 °)
- the impedance ratio of the obtained acoustic wave resonator depends on the ⁇ of the quartz crystal. Showing gender.
- the solid line indicates a characteristic without ripple in the band between fr and fa of the resonator, and the broken line indicates a characteristic with ripple.
- a good impedance ratio is obtained at (0 °, 115 ° to 145 °, 0 °) of quartz, but ripples are observed in other cases. However, in FIG. 12B, almost no ripple is seen, and a large impedance is obtained at any azimuth angle. Thus, the ⁇ dependency of the impedance ratio differs depending on the Al electrode thickness. Although not shown, when the Al electrode thickness is 0.08 wavelength or more, the Al electrode thickness is close to 0.2 wavelength. When the Al electrode has a wavelength of 0.08, the crystal substrate 11 is (0 °, 132 ° to 145 °, 0 °) in consideration of the range where the LSAW of the crystal becomes a positive TCF from FIG. 7B.
- the TCF of the acoustic wave device 10 can be significantly improved by combining the LT thin film 12 having a negative TCF and the quartz substrate 11 having a positive TCF.
- the quartz substrate 11 is (0 °, 135 ° to 145 °, 0 °)
- a better TCF can be obtained.
- the LT film thickness is 0.01 dB to 0.6 wavelength, 70 dB or more, and 0.02 wavelength to 0.4 wavelength.
- An impedance ratio of 75 dB is obtained at 73 dB or more and 0.03 wavelength to 0.3 wavelength.
- the impedance ratio of 70 dB when the LT thickness is 2 wavelengths or less is 73 dB or more at 0.02 to 0.043 wavelengths, and 75 dB at 0.03 to 0.33 wavelengths.
- the impedance ratio is obtained. Note that when the Al thickness is 0.1 to 0.3 wavelength, the same value as that when the Al thickness is 2 wavelengths is obtained.
- FIG. 15A shows (0 °, 120 °, 0 °) LT thin film 12 (thickness 0.15 wavelength) / (0 °, ⁇ , 90 °) on quartz substrate 11 with a thickness of 0.08 wavelength.
- 2 shows the ⁇ dependence of the quartz substrate 11 of the impedance ratio of the obtained acoustic wave resonator in the acoustic wave device 10 in which the Al interdigital electrode 13 is formed.
- the solid line indicates the characteristic without ripple in the resonator band, and the broken line indicates the characteristic with ripple.
- FIG. 15B when the LT thickness is 0.15 wavelength, the Al thickness is 0.1 wavelength, and when the LT thickness is 1.25 wavelength and 2 wavelengths, the Al thickness is 0.2 wavelength.
- the relationship between the impedance ratio and the Euler angle ⁇ is shown.
- FIG. 15A with an Al thickness of 0.08 wavelength, a good impedance ratio is obtained for quartz (0 °, 100 ° to 165 °, 90 °).
- the Euler angles of the quartz substrate 11 which becomes TCF with positive Rayleigh wave and LSAW are (0 °, 123 ° to 165 °, 90 ° ⁇ 5). °), and more preferably the Euler angles (0 °, 126 ° to 165 °, 90 ° ⁇ 5 °) of the crystal that gives a TCF of +5 ppm / ° C. or more, and a TCF of +7 ppm / ° C.
- the TCF of the acoustic wave device 10 can be significantly improved by combining the LT thin film 12 having a negative TCF and the quartz substrate 11 having a positive TCF.
- the quartz substrate 11 is (0 °, 127 ° to 165 °, 90 ° ⁇ 5 °)
- a better TCF can be obtained.
- FIG. 15C shows (0 °, 120 °, 0 °) LT thin film 12 (thickness 0.15 wavelength) / (0 °, 125.25 °, 90 ° when the Al thickness is 0.1 wavelength. )
- Frequency characteristics of the quartz substrate 11 are shown. In the azimuth angle of this crystal, ripples are generated in the band at a specific Al thickness, so that the impedance ratio in FIG. 15B is smaller than other azimuth angles.
- (°, 90 °) It is desirable to avoid the combination with the quartz substrate 11.
- the LT film thickness is 0.01 to 0.6 wavelengths.
- An impedance ratio of 70 dB or more, 73 dB or more at 0.02 to 0.4 wavelengths, and 75 dB at 0.03 to 0.3 wavelengths is obtained.
- the LT thickness is 2 wavelengths or less, and the impedance ratio of 70 dB is 0.02 wavelength to 0.0.43 wavelength, 73 dB or more, and 0.03 wavelength to 0.33 wavelength.
- An impedance ratio of 75 dB or more is obtained.
- the Al thickness is 0.1 wavelength or less, it shows the same value as the 0.08 wavelength.
- the Al thickness is 0.1 to 0.3 wavelength, it is almost the same as when the Al thickness is 0.2 wavelength. Show the same value.
- each of the acoustic wave devices 10 formed with the Al interdigital electrode 13 having two wavelengths has a frequency characteristic of impedance (Z) when the thickness of the LT thin film 12 is 0.15 wavelength and the thickness of the LT having an impedance ratio. Indicates dependency.
- the used quartz substrate 11 (0 °, 45 °, 0 °) has a Rayleigh wave TCF of 25 ppm / ° C., a Rayleigh wave sound speed of 3270 m / s, and an LSAW sound speed of 3950 m / s.
- the frequency is as low as 3 GHz, but a good impedance ratio of 75 dB is obtained.
- the LT film thickness is 0.43 wavelength or less, and an impedance ratio of 70 dB or more is obtained.
- FIG. 18 shows (0 °, 110 °, 0 °) LT thin film 12 / (20 °, 120 °, 115 °) quartz substrate 11 and (0 °, 110 °, 0 °) LT thin film 12 / (0 (°, 130 °, 0 °)
- the acoustic wave device 10 in which the Al interdigital electrode 13 having a thickness of 0.08 wavelength is formed on the quartz substrate 11, the dependence of the impedance ratio on the thickness of LT is shown.
- the used crystal substrate 11 (20 °, 120 °, 115 °) has an azimuth angle that excites a high-speed S wave (sound wave) of about 5000 m / s (0 °, 130 °).
- the quartz substrate 11 has an azimuth angle for exciting a high acoustic velocity LSAW. As shown in FIG. 18, in the case of the quartz substrate 11 (0 °, 130 °, 0 °), an impedance ratio of 70 dB or more can be obtained only when the LT thickness is 0.8 wavelength or less. On the other hand, in the case of the quartz substrate 11 having a high sound velocity S wave (20 °, 120 °, 115 °), an impedance ratio of 72 dB can be obtained even when the LT thickness is 10 wavelengths, and although not shown, the LT thickness is 20 wavelengths. However, 70 dB is obtained.
- the Euler angles of such high sound velocity S waves include (20 ° ⁇ 5 °, 120 ° ⁇ 10 °, 115 ° ⁇ 10 °), (0 ° ⁇ 5 °, 90 ° ⁇ 5 °, 0 ° ⁇ 10). °), (0 ° ⁇ 5 °, 90 °, 75 ° ⁇ 10 °), (0 ° ⁇ 5 °, 0 °, 0 ° ⁇ 10 °), (0 ° ⁇ 5 °, 0 °, 60 ° ⁇ 10 °).
- the LT thin film 12 shows almost the maximum value of the absolute value of TCF shown in FIG. 10C (0 °, 125 °, 0 °) among the optimum azimuth angles (0 °, 80 ° to 148 °, 0 °). ), Indicating the minimum values (0 °, 80 °, 0 °) and (0 °, 148 °, 0 °). As shown in FIGS.
- the azimuth angle of the quartz crystal substrate 11 capable of realizing practical ⁇ 20 to +20 ppm / ° C. with half the TCF of the LT thin film 12 is (0 ° ⁇ 5 °, 0 ° -23 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 32 ° -69 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 118 ° -180 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° -62 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 118 ° -180 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° to 72 °, 30 ° to 60 °), (0 ° ⁇ 5 °, 117 ° to 180 °, 30 ° to 60 °).
- the azimuth angles of the quartz substrate 11 that can realize better -10 to +10 ppm / ° C are (0 ° ⁇ 5 °, 0 ° -12 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 37 ° ⁇ 66 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 132 ° -180 °, 0 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° -50 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 126 ° -180 °, 90 ° ⁇ 5 °), (0 ° ⁇ 5 °, 0 ° -17 °, 30 ° -60 °), (0 ° ⁇ 5 °, 35 °- 67 °, 30 ° to 60 °), (0 ° ⁇ 5 °, 123 ° to 180 °, 30 ° to 60 °).
- FIGS. 20A and 20B show the ⁇ dependence of the sound velocity and electromechanical coupling coefficient of Rayleigh waves and LSAW of the (0 °, ⁇ , 0 °) LN substrate.
- FIG. 20C shows the TCF ⁇ dependency of the Rayleigh wave and LSAW of the (0 °, ⁇ , 0 °) LN substrate.
- an LN substrate has a small leakage component and a large coupling coefficient
- an LSAW of ⁇ 131 ° to 154 °, a large coupling coefficient
- ⁇ 90 °.
- a nearby LSAW or a love wave with zero leakage component using an electrode with a slow sound velocity on the substrate surface is used.
- the sound speed Vm of LSAW used is 4,150 to 4,450 m / s.
- FIG. 21 shows that the LSAW sound velocity is 4,250 m / s (0 °, 131 °, 0 °) LN thin film 12 (thickness 0.15 wavelength), and the LSAW sound velocity is 5,040 m / s (0 °, 115 °). , 90 °) an acoustic wave resonator obtained by combining a quartz substrate 11 (see FIG. 8A) and forming an interdigital electrode 13 having a thickness of 0.08 wavelength on an LN thin film 12. The frequency characteristics of the impedance (Z) are shown. As shown in FIG. 21, the impedance ratio is 79.3 dB, which is 19 dB larger than the conventional SAW characteristic of the LN substrate alone.
- good characteristics can be obtained as in the case of LT.
- good characteristics can be obtained by using the LN thin film 12 having a large coupling coefficient and using the quartz substrate 11 which has the same speed as the LSAW sound speed at that time or higher than the sound speed.
- LN thin film 12 (thickness 0.15 wavelength) / (0 °, 130 °, 0 °) on quartz substrate 11 has a thickness of 0.08 wavelength.
- 2 shows the dependence of LN on the ⁇ of the impedance ratio of the acoustic wave resonator obtained for the LSAW and Rayleigh wave for the acoustic wave device 10 in which the interdigital electrode 13 of 0.2 wavelength is formed. As shown in FIG.
- the impedance ratio of the resonator when the Al thickness is 0.08 wavelength and 0.2 wavelength is shown, and the solid line with an impedance ratio of 70 dB or more spreading in the center is good without ripples
- the broken line of 70 dB or less on both sides shows the characteristic with ripples.
- the same impedance ratio as that at 0.2 wavelength is obtained.
- LN thin film 12 (thickness 0.15 wavelength) / (0 °, ⁇ , 0 °) on quartz substrate 11 has a thickness of 0.08 wavelength.
- the impedance ratio of the acoustic wave resonator obtained with respect to LSAW and the (0 °, 55 °, 0 °) LN thin film 12 (thickness 0.15 wavelength) / (0 °, ⁇ , 0 °)
- An acoustic wave device 10 having an Al interdigital electrode 13 having a thickness of 0.08 wavelength formed on a quartz substrate 11 is changed to a Rayleigh wave.
- the impedance ratio of 75 dB or less divided on both sides is a characteristic with ripple in the band, and the impedance ratio of 75 dB or more is a good characteristic without ripple.
- the Al thickness When the Al thickness is 0.06 wavelength to 0.09 wavelength, the Al thickness shows the same impedance ratio as the 0.08 wavelength. When the Al thickness is 0.09 wavelength to 0.22 wavelength, the same impedance ratio as that at 0.2 wavelength is obtained.
- the Al thickness is 0.08 wavelength, from FIG. 7B, the Euler angles at which the LSAW TCF of the quartz substrate 11 is positive are (0 °, 132 ° to 180 °, 0 ° ⁇ 5 °). The Euler angles resulting in a TCF of +5 ppm / ° C. are (0 °, 135 ° -180 °, 0 ° ⁇ 5 °).
- the TCF of the acoustic wave device 10 can be significantly improved by combining the LN thin film 12 having a negative TCF and the quartz substrate 11 having a positive TCF.
- the Euler angles of the quartz substrate 11 are (0 °, 132 ° to 145 °, 0 ° ⁇ 5 °). Is preferable, and (0 °, 135 ° to 145 °, 0 ° ⁇ 5 °) is more preferable.
- the Euler angle of the quartz substrate 11 is (0 °, 90 ° to 178) as shown by the solid line.
- An impedance ratio of 70 dB is obtained at 0 ° ⁇ 5 °.
- the broken line portion has a lip, and exhibits an impedance ratio of 70 dB or less.
- either LSAW or Rayleigh wave indicates TCF plus.
- the LN film thickness is 0.01 dB to 0.6 wavelength, 70 dB or more, and 0.02 wavelength to 0.5 wavelength.
- An impedance ratio of 75 dB is obtained at 73 dB or more and 0.03 to 0.33 wavelengths.
- the LN film thickness is 70 dB or more at 0.012 to 2 wavelengths, 73 dB or more at 0.02 to 0.7 wavelengths, and 75 dB at 0.03 to 0.4 wavelengths. The above impedance ratio is obtained.
- LN thin film 12 (thickness 0.15 wavelength) / (0 °, 130 °, 90 °) on quartz substrate 11 has a thickness of 0.08 wavelength.
- 2 shows the dependence of LN on the ⁇ of the impedance ratio of the acoustic wave resonator obtained for the LSAW and Rayleigh wave for the acoustic wave device 10 in which the interdigital electrode 13 of 0.2 wavelength is formed.
- the impedance ratio of the resonator when the Al thickness is 0.08 wavelength and 0.2 wavelength is shown, and the central solid line with an impedance ratio of 70 dB or more is a ripple in the band.
- the broken line of 70 dB or less on both sides shows the characteristic with ripple.
- the Al thickness 0.08 wavelength
- ⁇ 70 ° to 170 °.
- Al thickness 0.06 wavelength to 0.09 wavelength
- Al thickness shows the same impedance ratio as 0.08 wavelength.
- the Al thickness 0.09 wavelength to 0.22 wavelength
- the same impedance ratio as that at 0.2 wavelength is obtained.
- FIG. 24B shows (0 °, 131 °, 0 °) LN thin film 12 (thickness 0.15 wavelength) / (0 °, ⁇ , 90 °) on quartz substrate 11 with a thickness of 0.08 wavelength.
- An acoustic wave device 10 in which an Al interdigital electrode 13 having a thickness of 0.08 wavelength is formed on a quartz substrate 11 is converted into a Rayleigh wave.
- the ⁇ dependence of the quartz substrate 11 of the impedance ratio of the acoustic wave resonator obtained is shown.
- a solid line at the center with an impedance ratio of 70 dB or more shows a characteristic without ripple in the band, and a broken line with 70 dB or less on both sides shows a characteristic with ripple.
- the Al thickness is 0.08 wavelength
- the Al thickness is 0.2 wavelength
- the azimuth angle is omnidirectional.
- Al thickness is 0.06 wavelength to 0.09 wavelength
- Al thickness shows the same impedance ratio as 0.08 wavelength.
- the quartz substrate 11 has an Euler angle (0 °, 123 ° to 180 °, 90 ° ⁇ 5 °) with a positive LSAW TCF, and a TCF of +5 ppm / ° C.
- the Euler angles are (0 °, 126 ° -180 °, 90 ° ⁇ 5 °).
- the TCF of the acoustic wave device 10 can be significantly improved by combining the LN thin film 12 having a negative TCF and the quartz substrate 11 having a positive TCF. From the results of FIG. 8B and FIG.
- the Euler angles of the quartz substrate 11 are (0 °, 123 ° to 155 °, 90 ° ⁇ 5 °). Is preferable, and (0 °, 126 ° to 155 °, 90 ° ⁇ 5 °) is more preferable. Further preferred is a crystal LSAW TCF of +7 ppm / ° C. or higher (0 °, 127 ° to 155 °, 90 ° ⁇ 5 °).
- the Euler angles of the quartz substrate 11 are (0 °, 80 ° to 160 °, 90 ° ⁇ 5 °) and 70 dB (0 °, 115 ° to 145 °, 90 ° ⁇ 5 °). An impedance ratio of 75 dB is obtained.
- the Euler angle of the quartz substrate 11 is preferably (0 °, 125 ° to 160 °, 90 ° ⁇ 5 °).
- the LN film thickness is 0.01 dB to 0.5 wavelength, 70 dB or more, and 0.02 wavelength to 0.33 wavelength.
- An impedance ratio of 75 dB is obtained at 73 dB or more and 0.06 wavelength to 0.3 wavelength.
- the LN film thickness is 70 dB or more at 0.01 to 2 wavelengths, 73 dB or more at 0.02 to 0.43 wavelengths, 0.06 to 0.36 wavelengths.
- An impedance ratio of 75 dB or more is obtained.
- the LN thin film 12 shows the minimum value of the absolute value of the TCF of LSAW shown in FIG. 20 (c) among the optimum azimuth angles (0 ° ⁇ 5 °, 75 to 165 °, 0 ° ⁇ 5 °) (0 ° 154 °, 0 °), maximum values (0 °, 85 °, 0 °), and Rayleigh wave optimum orientations (0 °, 38 °, 0 °). As shown in FIGS.
- the azimuth angle of the quartz substrate 11 capable of realizing a practical TCF of ⁇ 20 to +20 ppm / ° C. is (0 ° ⁇ 5 °, 0 ° to 16) in LSAW.
- the SiO 2 film has the same constants as fused quartz, and the film containing SiO as a component is a film such as SiOF or SiON.
- SiO x Z y In the chemical formula, x is 30% or more with respect to x + y. This film has the same characteristics as the SiO 2 film.
- FIG. 29 Pyrex glass, borosilicate glass, synthetic quartz, fused silica, and quartz glass are used as the substrate 11, and (0 °, 110 °, 0 °) LT thin films 12 (thickness 0.15 wavelength) are used. / The thickness dependence of LT of an impedance ratio is shown about the acoustic wave device 10 which formed the interdigital electrode 13 of thickness 0.08 wavelength on various board
- the LT film thickness is 0.52 wavelength or less and the SiO 2 content is about 70 to 80% by mass.
- the LT film thickness is 0.34 wavelength or less, and a good impedance ratio of 70 dB or more is obtained. It has also been confirmed that similar characteristics can be obtained even when an LN thin film is used instead of the LT thin film.
- FIG. 30 shows (0 °, 110 °, 0 °) LT thin film 12 / SiO 2 film / high sound velocity substrate and (0 °, 131 °, 0 °) LN thin film 12 / SiO 2 film / high sound velocity substrate.
- the dependence of the impedance ratio of LSAW on the thickness of the SiO 2 film is shown for the acoustic wave device 10 on which the Al interdigital electrode 13 having a thickness of 0.08 wavelength is formed.
- the LT thin film or LN thin film formed on a high sound velocity substrate having a transverse wave sound velocity of 5,900 m / s or more, such as sapphire, alumina (Al 2 O 3 ), and SiC shown in Table 7, can be obtained as shown in FIG.
- the film thickness of the SiO 2 film is desirably 1 wavelength or less, preferably 0.5 wavelength or less.
- the electrode thickness is 70 dB or more at a wavelength of 0.005 to 0.32 and 0.005 to 0.
- An impedance ratio of 73 dB or more at 28 wavelengths and 75 dB or more at 0.005 to 0.25 wavelengths is obtained.
- the electrode thickness is 70 dB or more at 0.005 to 0.20 wavelength, 73 dB or more at 0.005 to 0.19 wavelength, 0.005
- An impedance ratio of 75 dB or more is obtained at a wavelength of ⁇ 0.18.
- the electrode thickness is 70 dB or more at a wavelength of 0.005 to 0.28, 73 dB or more at a wavelength of 0.005 to 0.27, 0.
- An impedance ratio of 75 dB or more is obtained at a wavelength of 005 to 0.20.
- the electrode thickness is 70 dB or more at 0.005 to 0.20 wavelength, 73 dB or more at 0.005 to 0.13 wavelength, 0.005
- An impedance ratio of 75 dB or more is obtained at a wavelength of ⁇ 0.11.
- the optimum thickness varies depending on the type of electrode, and the lower the density of the electrode, the wider the range of the optimum thickness where a large impedance ratio can be obtained. From this, it can be said that the range of the optimum thickness depends on the density of the electrode.
- Table 8 shows the relationship between the optimum thickness range and the electrode density. In Table 8, “A” indicates a condition for obtaining an impedance ratio of 70 dB or more, “B” indicates a condition for obtaining an impedance ratio of 73 dB or more, and “A” indicates a condition for obtaining an impedance ratio of 75 dB or more.
- each interdigital electrode 13 has an optimum film thickness obtained from FIG. That is, when the interdigital electrode 13 is Al, the electrode thickness is 0.08 wavelength, 0.045 wavelength when Cu, 0.05 wavelength when Mo, and 0.03 wavelength when Pt.
- the widest band is obtained where the metallization ratio is smaller than 0.5 regardless of the material of the interdigital electrode 13.
- the metallization ratio at which the impedance ratio increases that is, the optimum metallization ratio differs depending on the type of electrode.
- Table 9 shows the relationship between the optimal metallization ratio and the electrode density. “A” in Table 9 is a condition for obtaining a high impedance ratio (approximately 75.5 dB or more), “B” is a condition for obtaining a higher impedance ratio (approximately 76.5 dB or more), and “C” is the highest impedance.
- FIG. 1B shows the structure of an IDT (interdigital electrode) 13 / piezoelectric thin film 12 / quartz substrate 11 as the acoustic wave device 10, including the short-circuit electrode 31.
- IDT interdigital electrode
- FIG. 33 shows an example in which the piezoelectric thin film 12 is made of LiTaO 3 crystal (LT) and the substrate 11 is made of a quartz substrate.
- FIG. 33A shows a structure composed of IDT 13 / piezoelectric thin film 12 (LT) / substrate 11 and the same structure as FIG. FIG.
- FIG. 33B shows IDT 13 / piezoelectric thin film 12 (LT) / short-circuit electrode 31 / substrate 11.
- FIG. 33 (c) shows the piezoelectric thin film 12 (LT) / IDT 13 / substrate 11, in which the IDT 13 is embedded on the substrate 11 side (upper figure) and that embedded on the piezoelectric thin film 12 side. (See below).
- FIG. 33 (d) shows the short-circuit electrode 31 / piezoelectric thin film 12 (LT) / IDT 13 / substrate 11, where the IDT 13 is embedded on the substrate 11 side (upper figure) and embedded on the piezoelectric thin film 12 side. There is something (below).
- FIGS. 34 (a) and 34 (b) show the LT film of the acoustic wave resonator band and impedance ratio obtained for the acoustic wave device 10 having the four structures shown in FIGS. 33 (a) to 33 (d). Shows thickness dependence.
- the piezoelectric thin film 12 is a (0 °, 110 °, 0 °) LT thin film
- the quartz substrate 11 is a (0 °, 132.75 °, 90 °) quartz substrate
- the IDT 13 has a thickness. It is an 0.08 wavelength Al electrode.
- the short-circuit electrode 31 is provided so that a thin electrode surface covers the entire surface of the crystal substrate 11 or the piezoelectric thin film 12, and all the electrode surfaces are electrically short-circuited.
- the short-circuit electrode 31 is a floating electrode that is not connected to the IDT 13.
- the widest band is obtained with the IDT / LT / quartz structure shown in FIG. 33 (a) regardless of the thickness of the LT.
- a large impedance ratio is obtained with the structure of IDT / LT / quartz shown in FIG. 33 (a) and IDT / LT / short-circuited electrode / quartz shown in FIG. 33 (b). It has been. Although the required band varies depending on the application, the impedance ratio greatly affects the mechanical Q. Therefore, the larger the better, the better. For this reason, even if it is a structure shown in FIG.33 (b), it is thought that the same effect is acquired on the same conditions as the structure shown in FIG.33 (a).
- the acoustic wave device 10 may be provided so that the entire IDT 13 may be embedded in the piezoelectric thin film 12, the lower part is embedded in the piezoelectric thin film 12, and the upper part protrudes from the piezoelectric thin film 12. It may be.
- FIG. 35 shows the dependency of the obtained impedance ratio on the film thickness of the piezoelectric thin film 12 for the elastic wave device 10 having the two structures and the structure of FIG.
- the piezoelectric thin film 12 is a (0 °, 110 °, 0 °) LT thin film
- the quartz substrate 11 is a (0 °, 132.75 °, 90 °) quartz substrate
- the IDT 13 has a thickness. It is an 0.08 wavelength Al electrode.
- the acoustic wave device 10 may have an insulating bonding film 32 between the crystal substrate 11 and the piezoelectric thin film 12.
- the bonding film 32 is preferably made of a hard material having a low sound absorption property.
- the bonding film 32 is made of Ta 2 O 5 or ZnO whose bulk transverse wave sound velocity [(C 44 E / density) 1/2 ] is significantly slower than the sound velocity of quartz.
- the bonding film 32 is made of Si x N y with a high shear wave sound velocity, the SAW sound velocity increases, the band slightly narrows, and the impedance slightly decreases as the film thickness of the bonding film 32 increases.
- the bonding film 32 is made of polycrystalline Si or SiO 2 whose transverse wave sound speed is close to the sound speed of quartz, the sound speed of the SAW slightly changes and the band slightly increases as the film thickness of the bonding film 32 increases.
- the impedance ratio does not vary greatly until the thickness of the bonding film 32 reaches three wavelengths.
- a SiO 2 film it has a positive TCF, which is effective in improving TCF.
- the SiO 2 film is 0.1 wavelength or more, the TCF is plus 5 ppm / ° C. or more, and when it is 0.2 wavelength or more, plus 10 ppm / Improved over °C.
- the same TCF can be obtained even if the azimuth angle ⁇ of the crystal is shifted by about ⁇ 10 °.
- FIG. 36C when the SiO 2 film has a wavelength of 1.2 or less, there is no deterioration of the impedance ratio.
- FIG. 36B when the SiO 2 film has a wavelength of 0.3 or less, there is no decrease in the bandwidth, and a bandwidth of 94% can be secured even at the 0.5 wavelength.
- the same characteristics as those of SiO 2 can be obtained by the above-described SiO x Z y film containing SiO as a main component.
- the relationship between the bonding film 32 and its optimum thickness depends on the bulk shear wave velocity.
- the characteristics of the acoustic wave device 10 when the bonding film 32 is used have a large impedance when the thickness of the bonding film 32 is equal to or less than 0.34 wavelength, regardless of the bulk shear wave velocity. A ratio is obtained.
- the optimum thickness of the bonding film 32 greatly depends on the bulk shear wave sound velocity of the bonding film 32.
- the thickness of the bonding film 32 is 0.13 wavelength or less, a larger impedance ratio is obtained, and when the thickness of the bonding film 32 is 0.04 wavelength or less, a larger impedance ratio is obtained.
- Table 10 shows the relationship between the shear wave speed of the bonding film 32 and the optimum film thickness of the bonding film 32.
- “A” in Table 10 is a condition for obtaining a high impedance ratio (approximately 70 dB or more)
- “B” is a condition for obtaining a higher impedance ratio (approximately 73 dB or more)
- “C” is the highest impedance ratio (approximately 75 dB). The above conditions are obtained. It has been confirmed that the relationship shown in Table 10 can be applied even when the piezoelectric thin film 12 is made of LN.
- Vs1, Vs2, Vs3, and Vs4 four kinds of materials having different shear wave sound speeds shown in Table 10 were designated as Vs1, Vs2, Vs3, and Vs4, and two of these were variously combined as the first layer and the second layer of the bonding film 32. Sought about things. Also, the Ta 2 O 5, Vs2 and Vs1 discussed ZnO, Vs3 to the SiO 2, Vs4 as Si x N y.
- the first and second layers of the bonding film 32 are Vs3 (SiO2 film, Vs4 film, Vs4 film and Vs3 film, Vs2 film and Vs3 film, Vs1 film and Vs3 film, respectively. 2 )
- the results of film thickness dependence are shown in FIGS. 37 (a) to (d).
- the numerical value in each drawing indicates the thickness (wavelength) of the bonding film 32 which is different from Vs3.
- Table 11 shows the relationship between the combination of the first and second layers of the bonding film 32 and the optimum total film thickness obtained from these examination results.
- A is a condition for obtaining a high impedance ratio (approximately 70 B or more)
- B is a condition for obtaining a higher impedance ratio (approximately 73 dB or more)
- C is the highest impedance ratio (approximately 75 dB).
- the above conditions are obtained.
- the conditions showing a good impedance ratio may be that the first layer of the bonding film 32 satisfies the conditions shown in Table 10, and the total film thickness of the first and second layers should satisfy the conditions shown in Table 11.
- the SiO 2 film can be reduced to 1.5 wavelengths or less by selecting the type and thickness of the first layer.
- An impedance ratio of 75 dB or more can be obtained.
- the bonding layer 32 has three layers was examined. (0 °, 110 °, 0 °) LT thin film 12 (thickness 0.15 wavelength) / first layer of bonding film 32 / second layer of bonding film 32 / third layer of bonding film 32 / (0 °, 132 .75 °, 90 °)
- the film thickness dependency was obtained.
- Vs1, Vs2, Vs3, and Vs4, respectively the four types of materials having different shear wave sound speeds shown in Table 10 are Vs1, Vs2, Vs3, and Vs4, respectively, and three of them are the first layer, the second layer, and the third layer of the bonding film 32.
- the Ta 2 O 5, Vs2 and Vs1 discussed ZnO, Vs3 to the SiO 2, Vs4 as Si x N y.
- the first layer of the bonding film 32 is Vs3 (thickness 0.1 wavelength)
- the second layer is Vs4 (thickness 0.1 wavelength)
- the third layer is Vs1, Vs2, Vs3, or Vs4. The result is shown in FIG. As shown in FIG.
- the third layer is a Vs1 (Ta 2 O 5 ) film or a Vs2 (ZnO) film
- an impedance ratio of 70 dB or more is obtained at a film thickness of 1 wavelength or less
- the third layer is In the case of a Vs3 (SiO 2 ) film or a Vs4 (Si x N y ) film, an impedance ratio of about 75 dB is obtained at a film thickness of 5 wavelengths or less.
- the first layer of the bonding film 32 is Vs4 (thickness 0.01 wavelength)
- the second layer is Vs3 (thickness 0.1 wavelength)
- the third layer is Vs1, Vs2, Vs3, or Vs4.
- FIG. 38 (b) shows the result when As shown in FIG.
- the third layer is a Vs1 (Ta 2 O 5 ) film or a Vs2 (ZnO) film
- an impedance ratio of 70 dB or more is obtained with a film thickness of 1 wavelength or less
- the third layer is In the case of a Vs3 (SiO 2 ) film or a Vs4 (Si x N y ) film, an impedance ratio of about 73 dB is obtained with a film thickness of 5 wavelengths or less.
- Table 12 shows the relationship between the combination of the first to third layers of the bonding film 32 and the optimum total film thickness obtained from these examination results.
- “A” indicates a condition for obtaining a high impedance ratio (approximately 70 dB or more)
- “B” indicates a condition for obtaining a higher impedance ratio (approximately 73 dB or more).
- the conditions showing a good impedance ratio may be that the first layer of the bonding film 32 should satisfy the conditions shown in Table 10, and the total film thickness of the first to third layers should satisfy the conditions shown in Table 12. Even when the bonding film 32 has four or more layers, the first layer needs to satisfy Table 10.
- requires a sound speed etc.
- the thin film is a mixed film of two or more films
- the arithmetic average of the respective films may be used.
- the SiO 2 film can be formed by selecting the type and thickness of the layer other than the SiO 2 film.
- An impedance ratio of 75 dB or more can be obtained at 5 wavelengths or less.
- FIG. 40 shows the relationship between the impedance ratio of the acoustic wave device 10 and the electrode thickness in the higher-order mode for the interdigital electrode 13 made of various materials.
- the acoustic wave device 10 the (0 °, 110 °, 0 °) LT thin film 12 (thickness 0.15 wavelength) / (0 °, 132.75 °, 90 °) is formed on the quartz substrate 11.
- various interdigital electrodes 13 having a wavelength of 0.6 are formed.
- Table 13 shows the relationship between the optimum thickness range and the electrode density. Table 13 shows the results when the metallization ratio of the interdigital electrode 13 is 0.5.
- the interdigital electrode 13 When an alloy or a multilayer electrode film is used as the interdigital electrode 13, an average density is obtained from the electrode thickness and the theoretical electrode density, and an optimum electrode thickness is obtained from Table 13 based on the average density.
- the metallization ratio is 0.5
- FIG. 41 shows elastic waves of the structure of IDT13 / piezoelectric thin film 12 / quartz substrate 11 shown in FIG. 33 (a) and the structure of IDT13 / piezoelectric thin film 12 / short-circuit electrode 31 / crystal substrate 11 shown in FIG. 33 (b).
- the film thickness dependence of the piezoelectric thin film 12 of the obtained impedance ratio is shown.
- the piezoelectric thin film 12 is a (0 °, 110 °, 0 °) LT thin film
- the quartz substrate 11 is a (0 °, 132.75 °, 90 °) quartz substrate
- the IDT 13 has a thickness. It is a 0.2 wavelength Au electrode.
- the structure of FIG. 33A having no short-circuit electrode 31 the structure of FIG. 33B having the short-circuit electrode 31 when the LT film thickness is 0.35 to 9.3 wavelengths.
- the LT film thickness is 0.5 to 9 wavelengths, an impedance ratio of 70 dB or more is obtained. It has also been confirmed that similar characteristics can be obtained even when an LN thin film is used instead of the LT thin film.
- the acoustic wave device 10 in which the interdigital electrode 13 of Au is formed on the LT thin film 12 / (0 °, ⁇ , 90 °) quartz substrate 11, the higher order mode (1-th of the obtained acoustic wave resonator) ) Shows the ⁇ dependency of the quartz substrate 11.
- the thickness of LT was made into four types, 0.5 wavelength ((lambda)), 1 wavelength, 2 wavelengths, and 4 wavelengths.
- the thickness of the interdigital electrode 13 was set to 0.2 wavelength.
- the acoustic wave device 10 is manufactured as follows. First, a piezoelectric substrate 12a made of LT or LN is prepared (see FIG. 43A), and the piezoelectric substrate 12a is bonded onto the quartz substrate 11 (see the left diagram in FIG. 43B). When the short-circuit electrode 31 and the bonding film 32 are formed between the piezoelectric substrate 12a and the quartz substrate 11, the short-circuit electrode 31 and the bonding film 32 are bonded onto the quartz substrate 11, and then the piezoelectric film is formed thereon. The substrate 12a is bonded (see the right diagram in FIG. 43B). Each substrate or film may be bonded using an adhesive, but may be bonded by so-called direct bonding in which the bonding surfaces are bonded by activation treatment with plasma or the like.
- the piezoelectric substrate 12a is polished to form a thin film (piezoelectric thin film 12) (see FIG. 43C).
- An electrode film made of Al or the like is formed on the surface of the piezoelectric thin film 12, and a resist is applied thereon, followed by patterning (exposure and development), etching, and removal of the resist, thereby forming the interdigital electrode 13 And the reflector 14 is formed (refer FIG.43 (d)).
- the acoustic wave device 10 can be manufactured by separating unnecessary portions (see FIG. 43E).
- 43 (c) to 43 (e) show the case of the left figure of FIG. 43 (b), but in the case of the right figure of FIG. 43 (b), the crystal substrate 11 and the piezoelectric thin film 12 are shown.
- the acoustic wave device 10 having the short-circuit electrode 31 and the bonding film 32 can be manufactured.
- Elastic wave device 11 Substrate (quartz substrate) 12 Piezoelectric thin film (LT thin film, LN thin film) 12a Piezoelectric substrate 13 Interdigital transducer (IDT) 21 Electrode finger 14 Reflector 31 Short-circuit electrode 32 Bonding film 50 Conventional Acoustic Wave Device 51 Piezoelectric Substrate 52 Interdigital Electrode (IDT) 53 Reflector
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Abstract
Description
図1乃至図43は、本発明の実施の形態の弾性波デバイスを示している。
図1(b)に示すように、本発明の実施の形態の弾性波デバイス10は、基板11と、その基板11の上に設けられた圧電薄膜12と、その圧電薄膜12の上に設けられたすだれ状電極(IDT)13とを有している。
図2(a)および(b)に、図1(a)に示す従来の弾性波デバイス50で、(0°、110°、0°)のLT基板から成る圧電基板51、および(0°、132°、0°)のLT基板から成る圧電基板51の上に、それぞれ厚みが0.08波長のAlのすだれ状電極52を形成して作製したSAW共振子について、得られたインピーダンス(Z)の周波数特性をそれぞれ示す。
図10(a)および(b)に、(0°、θ、0°)LT基板のレイリー波とLSAWの、音速および電気機械結合係数(結合係数:coupling factor)のθ依存性を示す。また、図10(c)に、(0°、θ、0°)LT基板のLSAWの、TCFのθ依存性を示す。図10(a)および(b)に示すように、LT基板では一般的に、漏洩成分が小さく、結合係数が4%以上である、θ=120°~146°のLSAWが使用されている。このときの音速Vm(基板表面を電気的に短絡した時の音速)は、4,000~4,100m/sである。しかし、フィルタの帯域は、使用する基板の結合係数に依存するため、所望の帯域を満足させる結合係数を選ぶ必要がある。本発明の実施の形態の弾性波デバイス10によれば、LTの下に同程度あるいは高音速な基板を使用すると漏洩成分が小さくなるため、結合係数が大きいθ=65°~148°を使用し、そのときの音速3,700~4,100m/sと同程度あるいはそれより高音速である水晶基板11を用いることにより、良好な特性が得られる。
図20(a)および(b)に、(0°、θ、0°)LN基板のレイリー波とLSAWの、音速および電気機械結合係数のθ依存性を示す。また、図20(c)に、(0°、θ、0°)LN基板のレイリー波とLSAWの、TCFのθ依存性を示す。図20(a)および(b)に示すように、LN基板では一般的に、漏洩成分が小さく結合係数が大きい、θ=131°~154°のLSAWや、結合係数が大きい、θ=90°近傍のLSAWや、基板表面に音速の遅い電極を用いて、漏洩成分をゼロにしたラブ波などが使用されている。使用されているLSAWの音速Vmは、4,150~4,450m/sである。
基板11として、水晶以外の材料について検討を行った。図28に、基板11として溶融石英基板を用い、(0°、110°、0°)LT薄膜12(厚み0.15波長)/溶融石英基板の上に、厚みが0.08波長のAlのすだれ状電極13を形成した弾性波デバイス10について、インピーダンス(Z)の周波数特性を示す。また、表7に、溶融石英など、基板11等の薄膜に使用される各種材料の定数を示す。表7に示すように、使用した溶融石英は、SiO2が100質量%であり、バルク波の横波の音速が約3,757m/sである。図28に示すように、溶融石英基板で、76dBの良好なインピーダンス比が得られている。表7に示すように、SiO2膜は溶融石英と同じ定数であり、SiOを成分とする膜は、SiOFやSiONなどの膜であり、SiO以外の成分をZとしたとき、SiOxZyの化学式において、xがx+yに対し30%以上である膜を示している。この膜は、SiO2膜と同じ特性が得られる。
すだれ状電極13の最適な厚みやメタライゼーション比について検討を行った。図31(a)および(b)に、(0°、110°、0°)LT薄膜12(厚み0.15波長)/(0°、132.75°、90°)水晶基板11の上に、様々な材質のすだれ状電極13を形成した弾性波デバイス10について、それぞれ得られた弾性波共振子の帯域およびインピーダンス比の、すだれ状電極13の厚み依存性を示す。すだれ状電極13として、Al、Cu、MoおよびPtから成るものを用いた。また、すだれ状電極13のメタライゼーション比は、0.5とした。
図1(b)には、弾性波デバイス10として、IDT(すだれ状電極)13/圧電薄膜12/水晶基板11の構造を示しているが、短絡電極31を含めて、図33(a)~(d)に示すような構造も考えられる。なお、図33では、圧電薄膜12がLiTaO3結晶(LT)から成り、基板11が水晶基板から成る例を示している。図33(a)は、IDT13/圧電薄膜12(LT)/基板11から成る構造であり、図1(b)と同じ構造である。図33(b)は、IDT13/圧電薄膜12(LT)/短絡電極31/基板11である。図33(c)は、圧電薄膜12(LT)/IDT13/基板11であり、IDT13が基板11の側に埋め込まれているもの(上図)と、圧電薄膜12の側に埋め込まれているもの(下図)がある。図33(d)は、短絡電極31/圧電薄膜12(LT)/IDT13/基板11であり、IDT13が基板11の側に埋め込まれているもの(上図)と、圧電薄膜12の側に埋め込まれているもの(下図)がある。
図1(c)に示すように、弾性波デバイス10は、水晶基板11と圧電薄膜12との間に、絶縁性の接合膜32を有していてもよい。接合膜32は、吸音性が小さく、硬い材質のものから成ることが好ましく、例えば、五酸化タンタル(Ta2O5)、酸化亜鉛(ZnO)、二酸化シリコン(SiO2)、多結晶Si、窒化シリコン(SixNy:x,yは整数)などから成っている。
接合層32が2層の場合について検討を行った。(0°、110°、0°)LT薄膜12(厚み0.15波長)/接合膜32の1層目/接合膜32の2層目/(0°、132.75°、90°)水晶基板11の上に、厚みが0.08波長のAlのすだれ状電極13を形成した弾性波デバイス10について、共振子のインピーダンス比の、接合膜32の1層目および2層目の膜厚依存性を求めた。このとき、表10に示す横波音速が異なる4種の材料を、それぞれVs1、Vs2、Vs3、Vs4とし、これらのうちの2つを接合膜32の1層目および2層目として様々に組み合わせたものについて求めた。また、Vs1をTa2O5、Vs2をZnO、Vs3をSiO2、Vs4をSixNyとして検討した。
なお、音速などを求める材料の定数は、公に公表されている定数を用いている。また、薄膜が2つ以上の膜の混合膜の場合は、それぞれの膜の相加平均とすればよい。
なお、図38(a)および(b)に示すように、1層目または2層目がSiO2膜の場合、SiO2膜以外の層の種類や厚みを選ぶことにより、SiO2膜が1.5波長以下で、75dB以上のインピーダンス比を得ることができる。
弾性波デバイス10で、弾性表面波の高次モードを利用する場合について検討を行った。図39に、(0°、110°、0°)LT薄膜12(厚み0.15波長)/(0°、132.75°、90°)水晶基板11の上に、厚みが0.6波長のAlのすだれ状電極13を形成した弾性波デバイス10について、インピーダンス(Z)の周波数特性を示す。図39に示すように、1.25GHzに基本モード(0-th)が、3.6GHzにその高次モード(1-th)が確認された。
図43に示すように、弾性波デバイス10は、以下のようにして製造される。まず、LTまたはLNから成る圧電基板12aを準備し(図43(a)参照)、水晶基板11の上に、その圧電基板12aを接合する(図43(b)の左図参照)。また、圧電基板12aと水晶基板11との間に、短絡電極31や接合膜32を形成する場合には、水晶基板11の上に短絡電極31や接合膜32を接合した後、その上に圧電基板12aを接合する(図43(b)の右図参照)。各基板や膜は、接着剤を用いて接合してもよいが、接合面をプラズマなどで活性化処理して接合する、いわゆる直接接合で接合してもよい。
11 基板(水晶基板)
12 圧電薄膜(LT薄膜、LN薄膜)
12a 圧電基板
13 すだれ状電極(IDT)
21 電極指
14 反射器
31 短絡電極
32 接合膜
50 従来の弾性波デバイス
51 圧電基板
52 すだれ状電極(IDT)
53 反射器
Claims (49)
- 弾性表面波を利用する弾性波デバイスであって、
二酸化ケイ素(SiO2)を70質量%以上含む基板と、
前記基板上に設けられたLiTaO3結晶またはLiNbO3結晶から成る圧電薄膜と、
前記圧電薄膜に接するよう設けられたすだれ状電極とを、
有することを特徴とする弾性波デバイス。 - 前記基板と前記圧電薄膜との間に、短絡電極および/または絶縁性の接合膜を有することを特徴とする請求項1記載の弾性波デバイス。
- 前記基板を伝搬する前記弾性表面波の音速が、前記圧電薄膜を伝搬する前記弾性表面波の音速よりも速くなるよう構成されていることを特徴とする請求項1または2記載の弾性波デバイス。
- 前記すだれ状電極は、前記圧電薄膜上に、少なくとも下部が前記圧電薄膜に埋め込まれるよう、および/または、少なくとも上部が前記圧電薄膜から突出するよう設けられていることを特徴とする請求項1乃至3のいずれか1項に記載の弾性波デバイス。
- 前記基板は水晶基板から成ることを特徴とする請求項1乃至4のいずれか1項に記載の弾性波デバイス。
- 前記基板は、バルク波の横波音速が3,400乃至4,800m/sであることを特徴とする請求項1乃至5のいずれか1項に記載の弾性波デバイス。
- 前記基板は、等方性の基板から成り、
前記圧電薄膜は、厚みが0.001mm以上0.01mm未満であることを
特徴とする請求項1乃至4および6のいずれか1項に記載の弾性波デバイス。 - 前記基板は、水晶基板から成り、伝搬する前記弾性表面波の音速が4,500m/s以上であることを特徴とする請求項1乃至7のいずれか1項に記載の弾性波デバイス。
- 前記基板は、水晶基板から成り、伝搬する前記弾性表面波の音速が4,800m/s以上であることを特徴とする請求項1乃至7のいずれか1項に記載の弾性波デバイス。
- 前記基板は、水晶基板から成り、伝搬する前記弾性表面波の音速が5,000m/s以上であることを特徴とする請求項1乃至7のいずれか1項に記載の弾性波デバイス。
- 前記基板は、水晶基板から成り、伝搬する前記弾性表面波はSH成分を主成分とする漏洩弾性波、または、音速が4,500m/s以上のS波であることを特徴とする請求項1乃至10のいずれか1項に記載の弾性波デバイス。
- 前記基板は、伝搬する前記弾性表面波の音速が4,500m/s以上であり、オイラー角が(0°±5°、70°~165°、0°±5°)、(0°±5°、95°~155°、90°±5°)、またはこれと結晶学的に等価なオイラー角であることを特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。
- 前記基板は、オイラー角が(0°±5°、0°~125°、0°±5°)、(0°±5°、0°~36°、90°±5°)、(0°±5°、172°~180°、90°±5°)、(0°±5°、120°~140°、30°~49°)、(0°±5°、25°~105°、0°±5°)、(0°±5°、0°~45°、15°~35°)、(0°±5°、10°~20°、60°~70°)、(0°±5°、90°~180°、30°~45°)、(0°±5°、0°±5°、85°~95°)、(90°±5°、90°±5°、25°~31°)、(0°±5°、90°±5°、-3°~3°)、またはこれらと結晶学的に等価なオイラー角であることを特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。
- 前記基板は、オイラー角が(20°±5°、120°±10°、115°±10°)、(0°±5°、90°±5°、0°±10°)、(0°±5°、90°±5°、75°±10°)、(0°±5°、0°±5°、0°±10°)、(0°±5°、0°±5°、60°±10°)またはこれらと結晶学的に等価なオイラー角であることを特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。
- 前記圧電薄膜は、LiTaO3結晶から成り、オイラー角が(90°±5°、90°±5°、33°~55°)、(90°±5°、90°±5°、125°~155°)またはこれらと結晶学的に等価なオイラー角であることを特徴とする請求項1乃至14のいずれか1項に記載の弾性波デバイス。
- 前記圧電薄膜は、LiNbO3結晶から成り、オイラー角が(90°±5°、90°±5°、38°~65°)、(90°±5°、90°±5°、118°~140°)またはこれらと結晶学的に等価なオイラー角であることを特徴とする請求項1乃至14のいずれか1項に記載の弾性波デバイス。
- 前記基板は、オイラー角が(0°±5°、0°~132°、0°±5°)、(0°±5°、0°~18°、0°±5°)、(0°±5°、42°~65°、0°±5°)、(0°±5°、126°~180°、0°±5°)またはこれと結晶学的に等価なオイラー角であり、
前記圧電薄膜は、LiTaO3結晶から成り、オイラー角が(0°±5°、82°~148°、0°±5°)またはこれと結晶学的に等価なオイラー角であることを
特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。 - 前記基板は、オイラー角が(0°±5°、0°~42°、90°±5°)(0°±5°、170°~190°、90°±5°)、(0°±5°、0°~45°、90°±5°)、(0°±5°、123°~180°、90°±5°)またはこれと結晶学的に等価なオイラー角であり、
前記圧電薄膜は、LiTaO3結晶から成り、オイラー角が(0°±5°、80°~148°、0°±5°)またはこれと結晶学的に等価なオイラー角であることを
特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。 - 前記基板は、オイラー角が(0°±5°、126°~180°、90°±5°)またはこれと結晶学的に等価なオイラー角であることを特徴とする請求項18記載の弾性波デバイス。
- 前記圧電薄膜は、オイラー角が(0°±5°、103°~125°、0°±5°)またはこれと結晶学的に等価なオイラー角であることを特徴とする請求項18または19記載の弾性波デバイス。
- 前記基板は、オイラー角が(1°~39°、100°~150°、0°~20°または70°~120°または160°~180°)またはこれと結晶学的に等価なオイラー角であり、
前記圧電薄膜は、LiTaO3結晶から成り、オイラー角が(0°±5°、80°~148°、0°±5°)またはこれと結晶学的に等価なオイラー角であることを
特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。 - 前記基板は、オイラー角が(0°±5°、0°~23°、0°±5°)、(0°±5°、32°~69°、0°±5°)、(0°±5°、118°~180°、0°±5°)、(0°±5°、0°~62°、90°±5°)、(0°±5°、118°~180°、90°±5°)、(0°±5°、0°~72°、30°~60°)、(0°±5°、117°~180°、30°~60°)またはこれと結晶学的に等価なオイラー角であり、
前記圧電薄膜は、LiTaO3結晶から成り、オイラー角が(0°±5°、80°~148°、0°±5°)またはこれと結晶学的に等価なオイラー角であることを
特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。 - 前記圧電薄膜は、前記弾性表面波の波長の0.001倍~2倍の厚みを有していることを特徴とする請求項17乃至22のいずれか1項に記載の弾性波デバイス。
- 前記圧電薄膜は、前記弾性表面波の波長の0.01倍~0.6倍の厚みを有していることを特徴とする請求項17乃至22のいずれか1項に記載の弾性波デバイス。
- 前記基板は、オイラー角が(0°±5°、0°~132°、0°±5°)、(0°±5°、0°~18°、0°±5°)、(0°±5°、42°~65°、0°±5°)、(0°±5°、126°~180°、0°±5°)またはこれと結晶学的に等価なオイラー角であり、
前記圧電薄膜は、LiNbO3結晶から成り、オイラー角が(0°±5°、75°~165°、0°±5°)またはこれと結晶学的に等価なオイラー角であることを
特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。 - 前記基板は、オイラー角が(0°±5°、0°~42°、90°±5°)、(0°±5°、90°~155°、90°±5°)、(0°±5°、0°~45°、90°±5°)、(0°±5°、123°~180°、90°±5°)またはこれと結晶学的に等価なオイラー角であり、
前記圧電薄膜は、LiNbO3結晶から成り、オイラー角が(0°±5°、70°~170°、0°±5°)またはこれと結晶学的に等価なオイラー角であることを
特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。 - 前記基板は、オイラー角が(1°~39°、100°~150°、0°~20°または70°~120°または160°~180°)またはこれと結晶学的に等価なオイラー角であり、
前記圧電薄膜は、LiNbO3結晶から成り、オイラー角が(0°±5°、95°~160°、0°±5°)またはこれと結晶学的に等価なオイラー角であることを
特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。 - 前記基板は、オイラー角が(0°±5°、90°~178°、0°±5°)、(0°±5°、80°~160°、90°±5°)またはこれと結晶学的に等価なオイラー角であり、
前記圧電薄膜は、LiNbO3結晶から成り、オイラー角が(0°±5°、35°~70°、0°±5°)、またはこれと結晶学的に等価なオイラー角であることを
特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。 - 前記基板は、オイラー角が(0°±5°、0°~16°、0°±5°)、(0°±5°、42°~64°、0°±5°)、(0°±5°、138°~180°、0°±5°)、(0°±5°、0°~30°、90°±5°)、(0°±5°、130°~180°、90°±5°)、(0°±5°、0°~28°、30°~60°)、(0°±5°、42°~70°、30°~60°)、(0°±5°、132°~180°、30°~60°)またはこれと結晶学的に等価なオイラー角であり、
前記圧電薄膜は、LiNbO3結晶から成り、オイラー角が(0°±5°、75°~165°、0°±5°)またはこれと結晶学的に等価なオイラー角であることを
特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。 - 前記基板は、オイラー角が(0°±5°、32°~118°、0°±5°)、(0°±5°、0°~30°、90°±5°)、(0°±5°、173°~180°、90°±5°)、(0°±5°、0°~142°、30°~60°)またはこれと結晶学的に等価なオイラー角であり、
前記圧電薄膜は、LiNbO3結晶から成り、オイラー角が(0°±5°、35°~70°、0°±5°)またはこれと結晶学的に等価なオイラー角であることを
特徴とする請求項1乃至11のいずれか1項に記載の弾性波デバイス。 - 前記圧電薄膜は、前記弾性表面波の波長の0.001倍~2倍の厚みを有していることを特徴とする請求項25、27、28、29または30記載の弾性波デバイス。
- 前記圧電薄膜は、前記弾性表面波の波長の0.012倍~0.6倍の厚みを有していることを特徴とする請求項25、27、28、29または30記載の弾性波デバイス。
- 前記圧電薄膜は、前記弾性表面波の波長の0.01倍~0.5倍の厚みを有していることを特徴とする請求項26、27、28、29または30記載の弾性波デバイス。
- 前記基板と前記圧電薄膜との間に、SiO2またはSiOを30%以上含むSi含有膜を有し、
前記基板は、バルク波の横波音速が5,900m/s以上であり、
前記Si含有膜は、前記弾性表面波の波長の0.15倍~1倍の厚みを有していることを
特徴とする請求項1乃至33のいずれか1項に記載の弾性波デバイス。 - 前記基板と前記圧電薄膜との間に、SiO2またはSiOを30%以上含むSi含有膜を有し、
前記基板は、バルク波の横波音速が5,900m/s以上であり、
前記Si含有膜は、前記弾性表面波の波長の0.3倍~0.5倍の厚みを有していることを
特徴とする請求項1乃至33のいずれか1項に記載の弾性波デバイス。 - 前記基板と前記圧電薄膜との間に、絶縁性の接合膜を有し、
前記接合膜は、厚みが0.34波長以下であることを
特徴とする請求項1乃至37のいずれか1項に記載の弾性波デバイス。 - 前記接合膜のうち最も前記圧電薄膜側の層または2番目に前記圧電薄膜に近い層が、SiO2またはSiOを30%以上含む膜から成り、前記弾性表面波の波長の0.001倍~1.2倍の厚みを有していることを特徴とする請求項38乃至41のいずれか1項に記載の弾性波デバイス。
- 前記接合膜のうち最も前記圧電薄膜側の層または2番目に前記圧電薄膜に近い層が、SiO2またはSiOを30%以上含む膜から成り、前記弾性表面波の波長の0.001倍~0.3倍の厚みを有していることを特徴とする請求項38乃至41のいずれか1項に記載の弾性波デバイス。
- 前記接合膜は4層以上から成り、最も前記圧電薄膜側の層がそのバルク横波音速に応じて表3に示す厚みを有していることを特徴とする請求項39記載の弾性波デバイス。
- 前記弾性表面波は高次モードから成り、
前記圧電薄膜は、前記弾性表面波の波長の0.35倍~9.3倍の厚みを有していることを
特徴とする請求項1乃至45のいずれか1項に記載の弾性波デバイス。 - 前記弾性表面波は漏洩弾性表面波であることを特徴とする請求項1乃至46のいずれか1項に記載の弾性波デバイス。
- 前記弾性表面波は縦波型の漏洩弾性表面波であることを特徴とする請求項1乃至16のいずれか1項に記載の弾性波デバイス。
- 前記圧電薄膜はLiNbO3結晶から成り、
前記弾性表面波はレイリー波であることを
特徴とする請求項1乃至15および請求項25乃至46のいずれか1項に記載の弾性波デバイス。
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WO2021006056A1 (ja) * | 2019-07-05 | 2021-01-14 | 株式会社村田製作所 | 弾性波装置、高周波フロントエンド回路及び通信装置 |
JP7401999B2 (ja) | 2019-09-12 | 2023-12-20 | 京セラ株式会社 | 弾性波素子 |
JP2021044738A (ja) * | 2019-09-12 | 2021-03-18 | 京セラ株式会社 | 弾性波素子 |
WO2021065684A1 (ja) * | 2019-09-30 | 2021-04-08 | 株式会社村田製作所 | 弾性波装置 |
JP2023508079A (ja) * | 2019-12-30 | 2023-02-28 | フレクエンシス | 横モードが抑制された単一ポート共振器のためのトランスデューサ構造 |
WO2022168798A1 (ja) * | 2021-02-04 | 2022-08-11 | 株式会社村田製作所 | 弾性波装置 |
WO2022168799A1 (ja) * | 2021-02-04 | 2022-08-11 | 株式会社村田製作所 | 弾性波装置 |
WO2022168796A1 (ja) * | 2021-02-04 | 2022-08-11 | 株式会社村田製作所 | 弾性波装置 |
WO2022168797A1 (ja) * | 2021-02-04 | 2022-08-11 | 株式会社村田製作所 | 弾性波装置 |
WO2022264933A1 (ja) * | 2021-06-16 | 2022-12-22 | 株式会社村田製作所 | 弾性波装置 |
WO2022269721A1 (ja) * | 2021-06-21 | 2022-12-29 | 国立大学法人東北大学 | 弾性表面波デバイス |
WO2022270406A1 (ja) * | 2021-06-21 | 2022-12-29 | 国立大学法人東北大学 | 弾性表面波デバイス |
WO2023048191A1 (ja) * | 2021-09-24 | 2023-03-30 | 株式会社村田製作所 | フィルタ装置 |
WO2023162594A1 (ja) * | 2022-02-22 | 2023-08-31 | 京セラ株式会社 | 弾性波装置および通信装置 |
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CN110114974B (zh) | 2024-01-12 |
JP6929565B2 (ja) | 2021-09-01 |
CN110114974A (zh) | 2019-08-09 |
JP2023053032A (ja) | 2023-04-12 |
KR20190085999A (ko) | 2019-07-19 |
JP2021177665A (ja) | 2021-11-11 |
DE112017005984T5 (de) | 2019-08-08 |
US11258427B2 (en) | 2022-02-22 |
TW201826580A (zh) | 2018-07-16 |
JPWO2018097016A1 (ja) | 2019-10-17 |
SG10202010325SA (en) | 2020-11-27 |
GB2572099B (en) | 2022-03-23 |
GB201908789D0 (en) | 2019-07-31 |
US20220173720A1 (en) | 2022-06-02 |
JP7229574B2 (ja) | 2023-02-28 |
US20190319603A1 (en) | 2019-10-17 |
GB2572099A (en) | 2019-09-18 |
CN117792334A (zh) | 2024-03-29 |
KR102554129B1 (ko) | 2023-07-12 |
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