WO2016147688A1 - 弾性波装置及びその製造方法 - Google Patents
弾性波装置及びその製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 230000005284 excitation Effects 0.000 claims abstract description 36
- 230000001629 suppression Effects 0.000 claims abstract description 3
- 230000002093 peripheral effect Effects 0.000 claims description 47
- 230000006866 deterioration Effects 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 229910052814 silicon oxide Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 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
- 239000013078 crystal Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 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
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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- 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
-
- 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
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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
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02842—Means for compensation or elimination of undesirable effects of reflections
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- 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
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- 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
- H03H3/10—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 for obtaining desired frequency or temperature coefficient
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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
- H03H9/02—Details
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02086—Means for compensation or elimination of undesirable effects
- H03H9/0211—Means for compensation or elimination of undesirable effects of reflections
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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
- H03H9/02—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
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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
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
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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
- H03H9/15—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
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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
- H03H9/15—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
- H03H9/172—Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
- H03H9/175—Acoustic mirrors
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- 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
- H03H2003/025—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 the resonators or networks comprising an acoustic mirror
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- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/06—Forming electrodes or interconnections, e.g. leads or terminals
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- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
Definitions
- the present invention relates to an elastic wave device and a manufacturing method thereof.
- a structure in which a cavity is omitted by providing an acoustic reflection layer is known.
- an IDT electrode is formed on one main surface of a piezoelectric layer, and an acoustic reflection layer is laminated on the other main surface of the piezoelectric layer.
- the acoustic reflection layer has a structure in which a high acoustic impedance layer and a low acoustic impedance layer are laminated.
- an elastic wave leaking from the piezoelectric layer side to the acoustic reflection layer side can be reflected to the piezoelectric layer side by the acoustic reflection layer. Therefore, the excitation efficiency of elastic waves can be increased.
- the resonance characteristic and the filter characteristic are deteriorated by the unnecessary wave.
- An object of the present invention is to provide an elastic wave device in which characteristics are hardly deteriorated by unnecessary waves.
- a piezoelectric layer having a first main surface and a second main surface facing the first main surface, and the piezoelectric layer And an acoustic reflection layer provided on the first main surface of the piezoelectric layer, wherein the acoustic reflection layer has a relatively high acoustic impedance.
- An elastic wave having an impedance layer and a low acoustic impedance layer having a relatively low acoustic impedance, and wherein the acoustic reflection layer has an unnecessary wave reflection suppressing structure that suppresses reflection of unnecessary waves to the piezoelectric layer side.
- a piezoelectric layer having a first main surface and a second main surface facing the first main surface, and the piezoelectric layer First and second excitation electrodes provided so as to be in contact with each other and an acoustic reflection layer provided on the first main surface of the piezoelectric layer, the acoustic reflection layers facing each other
- a high acoustic impedance layer having a pair of principal surfaces and a relatively high acoustic impedance
- a low acoustic impedance layer having a pair of opposing principal surfaces and a relatively low acoustic impedance; and the acoustic reflection layer.
- the outer peripheral edge of each main surface of the pair of main surfaces is in the direction of the outer peripheral edge. Do not lie in the extended plane Are songs, the elastic wave device is provided.
- a piezoelectric layer having a first main surface and a second main surface facing the first main surface, and the piezoelectric layer First and second excitation electrodes provided so as to be in contact with each other, and an acoustic reflection layer provided on the first main surface of the piezoelectric layer, wherein the acoustic reflection layer is relatively A high acoustic impedance layer having a high acoustic impedance; and a low acoustic impedance layer having a relatively low acoustic impedance; and at least one of the high acoustic impedance layer and the low acoustic impedance layer on an outer peripheral side surface of the acoustic reflection layer.
- An elastic wave device is provided in which the outer peripheral side surface of the other layer is arranged through a step with respect to the outer peripheral side surface of the other layer.
- the excitation electrode is an IDT electrode
- the IDT electrode is provided on at least one of the first main surface and the second main surface of the piezoelectric layer. It has been.
- an elastic wave such as a plate wave can be excited by the IDT electrode.
- the IDT electrode is provided on the second main surface of the piezoelectric layer.
- the IDT electrode is provided on the side opposite to the acoustic reflection layer, the elastic wave can be excited more effectively.
- a plate wave excited by the IDT electrode is used.
- the excitation electrode includes a first excitation electrode provided on the first main surface of the piezoelectric layer, and the second of the piezoelectric layer. And a second excitation electrode provided on the main surface. In this case, a bulk wave can be effectively excited between the first and second excitation electrodes.
- the method for manufacturing an elastic wave device according to the present invention is a method for manufacturing an elastic wave device configured according to the present invention.
- At least one low acoustic impedance layer and at least one high acoustic impedance layer are formed on the piezoelectric layer.
- the acoustic reflection layer includes a step of forming a film so as to include the unnecessary wave reflection suppressing structure, and a step of providing the excitation electrode so as to be in contact with the piezoelectric layer.
- the method for manufacturing an acoustic wave device provided in the second broad aspect of the present invention includes a step of forming the acoustic reflection layer on the piezoelectric layer, and a step of providing the excitation electrode so as to contact the piezoelectric layer.
- a step of forming the acoustic reflection layer in at least one of the high acoustic impedance layer and the low acoustic impedance layer, an outer peripheral edge of each main surface of the pair of main surfaces is a center of the layer.
- the main surfaces in the portion are curved so as not to be located in a plane extending in the outer peripheral direction. In this case, unnecessary waves are effectively diffused and the influence of unnecessary waves can be effectively reduced.
- the method for manufacturing an acoustic wave device provided in the third broad aspect of the present invention includes a step of forming the acoustic reflection layer on the piezoelectric layer, and a step of providing the excitation electrode so as to be in contact with the piezoelectric layer.
- a step of forming the acoustic reflection layer at least one of the high acoustic impedance layer and the low acoustic impedance layer is arranged such that at least one outer peripheral side surface thereof is disposed through a step with an outer peripheral side surface of the other layer.
- One layer is provided. In this case, at least one outer peripheral side surface of the layer is disposed through a step with respect to the outer peripheral side surface of the other layer, so that unnecessary waves partially cancel each other. Therefore, the influence of unnecessary waves can be effectively reduced.
- the elastic wave device provided according to the first to third broad aspects of the present invention, reflection of unnecessary waves to the piezoelectric layer side can be suppressed. Therefore, the characteristics of the acoustic wave device such as resonance characteristics and filter characteristics are hardly deteriorated.
- FIG. 1A is a front sectional view of an acoustic wave device according to a first embodiment of the present invention
- FIG. 1B is a partially cutaway front sectional view showing an enlarged main part thereof.
- FIG. 2 is a plan view of the acoustic wave device according to the first embodiment of the present invention.
- FIG. 3 is a partially cutaway front sectional view for explaining an unnecessary wave reflection suppressing structure of the acoustic wave device according to the second embodiment of the present invention.
- 4A to 4D are front sectional views for explaining the method of manufacturing the acoustic wave device according to the first embodiment.
- FIG. 5A and FIG. 5B are front sectional views for explaining a method of manufacturing the acoustic wave device of the first embodiment.
- FIG. 6 (a) to 6 (c) are front sectional views for explaining a method of manufacturing the acoustic wave device according to the first embodiment.
- FIG. 7 is a front cross-sectional view for explaining an elastic wave device according to a third embodiment of the present invention.
- FIG. 1A is a front sectional view of an acoustic wave device according to a first embodiment of the present invention
- FIG. 1B is a partially cutaway front sectional view showing an enlarged main portion thereof
- 2 is a plan view of the acoustic wave device according to the first embodiment.
- FIG. FIG. 1A corresponds to a cross section of a portion along the line AA in FIG.
- the elastic wave device 1 is not particularly limited, but is an elastic wave device using a plate wave.
- the acoustic wave device 1 has a piezoelectric layer 2.
- the piezoelectric layer 2 has a first main surface 2a and a second main surface 2b facing the first main surface 2a.
- the piezoelectric layer 2 is made of a piezoelectric single crystal such as LiNbO 3 or LiTaO 3 .
- the material of the piezoelectric layer 2 is not particularly limited, and other piezoelectric materials may be used.
- an IDT electrode 3 is provided as an excitation electrode.
- One bus bar of the IDT electrode 3 is connected to the terminal electrode 4a through the wiring electrode 4b.
- the other bus bar of the IDT electrode 3 is connected to the terminal electrode 4c through the wiring electrode 4d.
- the IDT electrode 3, the terminal electrodes 4a and 4c, and the wiring electrodes 4b and 4d can be formed using an appropriate metal or alloy.
- a broken line B in FIG. 2 indicates a boundary portion between the bus bar and the wiring electrode 4b or 4d.
- the acoustic reflection layer 5 is laminated on the first main surface 2a side of the piezoelectric layer 2.
- a support layer 6 is laminated on the reinforcing substrate 7.
- the support layer 6 is provided with a recess that opens toward the upper surface.
- the acoustic reflection layer 5 is filled in the recess.
- the thickness of the piezoelectric layer 2 is not particularly limited, but is preferably 100 nm or more and 1000 nm or less. In the case of 100 nm or more, the piezoelectric layer 2 is hardly damaged. If it is 1000 nm or less, the excitation efficiency of a plate wave can be improved effectively.
- a support layer 6 is laminated on the reinforcing substrate 7, and the piezoelectric layer 2 is further formed on the support layer 6.
- the support layer 6 and the reinforcing substrate 7 can be formed of an appropriate insulating resin, piezoelectric material, or the like.
- a material for example, silicon (Si), silicon oxide, silicon oxynitride, alumina, or the like can be used.
- the acoustic reflection layer 5 is formed by alternately laminating low acoustic impedance layers 5a, 5c, 5e having a pair of opposing main surfaces and high acoustic impedance layers 5b, 5d, 5f having a pair of opposing main surfaces. It has a structure.
- the acoustic impedance of the high acoustic impedance layers 5b, 5d, and 5f is higher than the acoustic impedance of the low acoustic impedance layers 5a, 5c, and 5e.
- the low acoustic impedance layers 5 a, 5 c and 5 e are preferably made of the same material as the support layer 6. In that case, the type of material can be reduced. In addition, the manufacturing process can be simplified. In the present embodiment, the support layer 6 and the low acoustic impedance layers 5a, 5c, 5e are made of the same material. However, the high acoustic impedance layers 5b, 5d, and 5f may be made of the same material as that of the support layer 6, and the low acoustic impedance layers 5a, 5c, and 5e may be formed of a material having an acoustic impedance lower than that of the support layer 6. .
- the low acoustic impedance layers 5 a, 5 c and 5 e and the high acoustic impedance layers 5 b, 5 d and 5 f may be made of a material different from that of the support layer 6.
- the material of the low acoustic impedance layers 5a, 5c, 5e is not particularly limited as long as the acoustic impedance is lower than that of the high acoustic impedance layers 5b, 5d, 5f.
- examples of the material constituting the low acoustic impedance layers 5a, 5c, 5e and the high acoustic impedance layers 5b, 5d, 5f include ceramics such as silicon oxide, silicon nitride, silicon oxynitride, alumina, and zinc oxide, and nitriding.
- a piezoelectric material such as aluminum, LiTaO 3 or LiNbO 3 , or a metal such as W can be used.
- silicon oxide having a relatively low acoustic impedance is suitably used as the low acoustic impedance layers 5a, 5c, 5e.
- a metal such as W, a piezoelectric body, or the like is preferably used as the high acoustic impedance layers 5b, 5d, 5f.
- the thicknesses of the low acoustic impedance layers 5a, 5c and 5e and the high acoustic impedance layers 5b, 5d and 5f are not particularly limited, but are preferably 100 nm or more and 500 nm or less. If it is in this thickness range, the thickness of the entire acoustic reflection layer 5 is not so thick, and the acoustic wave device 1 can be effectively reduced in thickness.
- the thickness of the support layer 6 is not particularly limited as long as it can surround the acoustic reflection layer 5.
- the support layer 6 reaches the lower side of the acoustic reflection layer 5, but the support layer 6 may not exist below the acoustic reflection layer 5. That is, the lower surface of the acoustic reflection layer 5 may be directly laminated on the reinforcing substrate 7.
- the acoustic reflection layer 5 is provided at a position overlapping the IDT electrode 3 when viewed in plan. Therefore, even if the plate wave excited by the IDT electrode 3 leaks to the acoustic reflection layer 5 side, it is reflected by the acoustic reflection layer 5 and the excitation efficiency of the plate wave can be increased.
- the feature of the elastic wave device 1 of the present embodiment is that the acoustic reflection layer 5 is provided with an unnecessary wave reflection suppressing structure 5x. That is, as shown in an enlarged view in FIG. 1B, at the outer peripheral edge of the acoustic reflection layer 5, a pair of main surfaces of the low acoustic impedance layers 5a, 5c, 5e and the high acoustic impedance layers 5b, 5d, 5f The outer peripheral edge of each main surface is curved so as not to be located in a plane extending from the main surface in the central portion of the acoustic impedance layers 5a to 5f in the outer peripheral direction.
- unnecessary waves generated in the piezoelectric layer 2 leak to the acoustic reflection layer 5 side together with the plate wave used.
- the unwanted waves are uniformly distributed on the outer peripheral side surface of the acoustic reflection layer 5. Reflected and difficult to attenuate. Therefore, the unnecessary wave returns to the piezoelectric layer 2, and the influence of the unnecessary wave appears on the resonance characteristics and the filter characteristics.
- each of a pair of opposing main surfaces A part of the outer peripheral edge of the main surface is curved so as not to be positioned in a plane extending from the main surface in the central portion of the layer in the outer peripheral direction.
- at least a part of the outer peripheral edge of each main surface is in a plane extending from each main surface in the central portion of the layer in the outer peripheral direction. If it is curved so as not to be positioned, unwanted waves can be diffusely reflected.
- the three low acoustic impedance layers 5a, 5c, and 5e and the three high acoustic impedance layers 5b, 5d, and 5f are laminated.
- the number of laminated impedance layers is not particularly limited. It is sufficient that at least one low acoustic impedance layer is provided.
- FIG. 3 is a partially cutaway front cross-sectional view for explaining an unnecessary wave reflection suppressing structure of an acoustic wave device according to a second embodiment of the present invention.
- the acoustic reflection layer 15 is formed by alternately laminating low acoustic impedance layers 15a, 15c, and 15e and high acoustic impedance layers 15b, 15d, and 15f. It has a structure.
- the outer peripheral side surface 15a1 of the low acoustic impedance layer 15a is separated from the outer peripheral side surface 15b1 of the adjacent high acoustic impedance layer 15b through a step.
- the outer peripheral side surfaces of the low acoustic impedance layers 15c and 15e are also separated from the outer peripheral side surfaces of the adjacent high acoustic impedance layers 15b, 15d and 15f among the high acoustic impedance layers 15b, 15d and 15f through a step. Therefore, the phase of the unnecessary wave reflected on the outer peripheral side surfaces of the low acoustic impedance layers 15a, 15c, and 15e and the unnecessary wave reflected on the outer peripheral side surfaces of the high acoustic impedance layers 15b, 15d, and 15f, for example, the outer peripheral side surface 15b1, vary. It will be. For this reason, unnecessary waves partially cancel each other. Therefore, it is possible to effectively suppress unwanted waves from being reflected by the acoustic reflection layer 15 and returning to the piezoelectric layer side.
- At least one outer peripheral side surface of the high acoustic impedance layers 15b, 15d, 15f and the low acoustic impedance layers 15a, 15c, 15e may be arranged so as to be stepped from the outer peripheral side surface of the other layers. Even in such a case, the phase of the reflected wave varies partially, so that the reflection of the unnecessary wave can be effectively suppressed.
- the number of the low acoustic impedance layers and the high acoustic impedance layers constituting the acoustic reflection layer 15 is not particularly limited.
- a low acoustic impedance layer 5a1 is formed by depositing silicon oxide on one main surface of the piezoelectric substrate 2A by sputtering.
- the high acoustic impedance layer 5b is formed on the low acoustic impedance layer 5a.
- the high acoustic impedance layer 5b is formed by vapor deposition lift-off using a photolithography technique.
- a high acoustic impedance layer 5b made of metal and a low acoustic impedance layer 5a made of silicon oxide are formed in a central portion as shown in the figure.
- a silicon oxide film is formed to form a low acoustic impedance layer 5c.
- the portion deposited on the high acoustic impedance layer 5b forms the low acoustic impedance layer 5c.
- the portion deposited around the low acoustic impedance layer 5c is laminated on the low acoustic impedance layer 5a1 formed first.
- the high acoustic impedance layer 5d, the low acoustic impedance layer 5e, and the high acoustic impedance layer 5f are sequentially formed in the same manner as described above. Accordingly, a support layer portion 6A made of silicon oxide is formed around the acoustic reflection layer 5.
- a support layer portion 6A made of silicon oxide is formed around the acoustic reflection layer 5.
- at least one outer peripheral side surface of the high acoustic impedance layer and the low acoustic impedance layer may be disposed so as to be stepped from the outer peripheral side surface of the other layer. This can be achieved by controlling the resist shape and electrode formation method during patterning.
- a silicon oxide film is further formed by sputtering or the like to form the support layer 6.
- the support layer 6 is polished, and as shown in FIG. 5B, the surface of the support layer 6 opposite to the piezoelectric substrate 2A is flattened.
- a reinforcing substrate 7 is laminated on the surface of the support layer 6 opposite to the piezoelectric substrate 2A for reinforcement.
- Si or SiO 2 is used for the reinforcing substrate.
- the piezoelectric substrate 2A is thinned. This thinning can be formed by directly polishing the substrate or by providing the piezoelectric substrate 2A with a high concentration ion implantation portion and peeling the piezoelectric substrate 2A with the high concentration ion implantation portion as a boundary.
- the IDT electrode 3 and the terminal electrodes 4a and 4c are formed on the second main surface 2b of the piezoelectric layer 2.
- the elastic wave device having the IDT electrode 3 and using a plate wave has been described.
- the present invention is not limited to an elastic wave device using a plate wave.
- FIG. 7 is a front cross-sectional view of an elastic wave device using a bulk wave as a third embodiment of the present invention.
- the acoustic reflection layer 5 is laminated on the reinforcing substrate 7. Further, the first excitation electrode 33 a is laminated on the upper surface of the piezoelectric layer 32, and the second excitation electrode 33 b is laminated on the lower surface as the first main surface of the piezoelectric layer 32.
- the elastic wave device 31 uses a bulk wave excited by the piezoelectric layer 32 by applying an alternating electric field from the first and second excitation electrodes 33a and 33b. That is, a bulk wave is excited by the first excitation electrode 33a and the second excitation electrode 33b.
- the unnecessary wave reflection suppressing structure is not limited to the above structure, and as in the second embodiment, the high acoustic impedance layers 5b, 5d, 5f and the low acoustic impedance layers 5a, 5c are used. , 5e, the outer peripheral side surface of at least one layer may be arranged through a step with the outer peripheral side surface of the other layer.
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Abstract
Description
2…圧電体層
2A…圧電基板
2a,2b…第1,第2の主面
3…IDT電極
4a,4c…端子電極
4b,4d…配線電極
5…音響反射層
5a,5a1,5c,5e…低音響インピーダンス層
5b,5b1,5d,5f…高音響インピーダンス層
5x…不要波反射抑制構造
6…支持層
6A…支持層部
7…補強基板
15…音響反射層
15a,15c,15e…低音響インピーダンス層
15a1,15b1…外周側面
15b,15d,15f…高音響インピーダンス層
31…弾性波装置
32…圧電体層
33a,33b…第1,第2の励振電極
Claims (11)
- 第1の主面と、該第1の主面と対向する第2の主面とを有する圧電体層と、
前記圧電体層に接するように設けられた励振電極と、
前記圧電体層の前記第1の主面上に設けられた音響反射層と、
を備え、
前記音響反射層が、相対的に音響インピーダンスが高い高音響インピーダンス層と、相対的に音響インピーダンスが低い低音響インピーダンス層とを有し、
前記音響反射層が、前記圧電体層側への不要波の反射を抑制する不要波反射抑制構造を有する、弾性波装置。 - 第1の主面と、該第1の主面と対向する第2の主面とを有する圧電体層と、
前記圧電体層に接するように設けられた第1及び第2の励振電極と、
前記圧電体層の前記第1の主面上に設けられた音響反射層と、
を備え、
前記音響反射層が、対向し合う一対の主面を有する、相対的に音響インピーダンスが高い高音響インピーダンス層と、対向し合う一対の主面を有する、相対的に音響インピーダンスが低い低音響インピーダンス層とを有し、
前記音響反射層において、前記低音響インピーダンス層及び高音響インピーダンス層のうち少なくとも1層において、前記一対の主面の内の各主面の外周縁が、当該層の中央部分における前記各主面を外周縁方向に延長した面内に位置しないように湾曲している、弾性波装置。 - 第1の主面と、該第1の主面と対向する第2の主面とを有する圧電体層と、
前記圧電体層に接するように設けられた第1及び第2の励振電極と、
前記圧電体層の前記第1の主面上に設けられた音響反射層と、
を備え、
前記音響反射層が、相対的に音響インピーダンスが高い高音響インピーダンス層と、相対的に音響インピーダンスが低い低音響インピーダンス層とを有し、
前記音響反射層の外周側面において、前記高音響インピーダンス層及び低音響インピーダンス層のうち少なくとも1層の外周側面が、他の層の外周側面と段差を経て配置されている、弾性波装置。 - 前記励振電極がIDT電極であり、該IDT電極が前記圧電体層の前記第1の主面及び第2の主面のうち少なくとも一方に設けられている、請求項1~3のいずれか1項に記載の弾性波装置。
- 前記IDT電極が前記圧電体層の前記第2の主面に設けられている、請求項4に記載の弾性波装置。
- 前記IDT電極により励振される板波を利用している、請求項1~5のいずれか1項に記載の弾性波装置。
- 前記励振電極が、前記圧電体層の前記第1の主面に設けられた第1の励振電極と、前記圧電体層の前記第2の主面に設けられた第2の励振電極とを有する、請求項1~3のいずれか1項に記載の弾性波装置。
- 前記第1の励振電極と前記第2励振電極とによりバルク波が励振される、請求項7に記載の弾性波装置。
- 請求項1に記載の弾性波装置の製造方法であって、
前記圧電体層上に、少なくとも1層の前記低音響インピーダンス層と、少なくとも1層の前記高音響インピーダンス層とを、前記音響反射層において前記不要波反射抑制構造を備えるように成膜する工程と、
前記圧電体層に接するように、前記励振電極を設ける工程とを備える、弾性波装置の製造方法。 - 請求項2に記載の弾性波装置の製造方法であって、
前記圧電体層に前記音響反射層を形成する工程と、
前記圧電体層に接するように前記励振電極を設ける工程とを備え、
前記音響反射層の形成に際し、前記高音響インピーダンス層及び前記低音響インピーダンス層のうちの少なくとも1層において、前記一対の主面の内の各主面の外周縁が、当該層の中央部分における前記各主面を外周縁方向に延長した面内に位置しないように湾曲させる、弾性波装置の製造方法。 - 請求項3に記載の弾性波装置の製造方法であって、
前記圧電体層に前記音響反射層を形成する工程と、
前記圧電体層に接するように前記励振電極を設ける工程とを備え、
前記音響反射層を形成するにあたり、前記高音響インピーダンス層及び前記低音響インピーダンス層のうち少なくとも1層の外周側面が、他の層の外周側面と段差を経て配置されるように当該少なくとも1層を設ける、弾性波装置の製造方法。
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018235731A1 (ja) * | 2017-06-23 | 2018-12-27 | 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および通信装置 |
WO2018235605A1 (ja) * | 2017-06-23 | 2018-12-27 | 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および通信装置 |
KR20190103411A (ko) * | 2017-02-21 | 2019-09-04 | 가부시키가이샤 무라타 세이사쿠쇼 | 탄성파 장치, 고주파 프론트엔드 회로 및 통신 장치 |
KR20200043455A (ko) | 2017-09-27 | 2020-04-27 | 가부시키가이샤 무라타 세이사쿠쇼 | 탄성파 장치 및 탄성파 장치의 제조 방법 |
WO2022244746A1 (ja) * | 2021-05-20 | 2022-11-24 | 株式会社村田製作所 | 弾性波装置及びその製造方法 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180241374A1 (en) * | 2015-09-25 | 2018-08-23 | Avago Technologies General Ip (Singapore) Pte. Ltd | Acoustic wave resonator having antiresonant cavity |
US20180337657A1 (en) * | 2015-09-25 | 2018-11-22 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Acoustic wave resonator having antiresonant cavity |
US10924086B2 (en) * | 2016-10-14 | 2021-02-16 | Qorvo Us, Inc. | Surface acoustic wave (SAW) device with antireflective structure |
EP3878097A1 (en) * | 2018-11-13 | 2021-09-15 | Huawei Technologies Co., Ltd. | Surface acoustic wave device with phononic crystal |
WO2020116528A1 (ja) * | 2018-12-06 | 2020-06-11 | 株式会社村田製作所 | 弾性波装置 |
KR102251000B1 (ko) * | 2018-12-28 | 2021-05-12 | (주)와이팜 | 에너지 누화를 최소화하는 다층 구조의 saw 공진기 및 제조 방법 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005159606A (ja) * | 2003-11-25 | 2005-06-16 | Tdk Corp | 圧電薄膜共振器およびその製造方法 |
JP2007129391A (ja) * | 2005-11-02 | 2007-05-24 | Matsushita Electric Ind Co Ltd | 音響共振器及びフィルタ |
JP2007208845A (ja) * | 2006-02-03 | 2007-08-16 | Matsushita Electric Ind Co Ltd | 圧電共振器 |
WO2009029134A1 (en) * | 2007-08-24 | 2009-03-05 | Maxim Integrated Products, Inc | Deposition of piezoelectric aln for baw resonators |
WO2012086441A1 (ja) * | 2010-12-24 | 2012-06-28 | 株式会社村田製作所 | 弾性波装置及びその製造方法 |
JP2014176095A (ja) * | 2013-03-12 | 2014-09-22 | Triquint Semiconductor Inc | 強固に固定されたバルク弾性波共振器における境界リングモード抑制 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003188675A (ja) * | 2001-12-19 | 2003-07-04 | Alps Electric Co Ltd | 表面弾性波素子及びそれを備えたデュプレクサ |
EP1515436A3 (en) * | 2003-08-29 | 2005-08-31 | Seiko Epson Corporation | Surface acoustic wave element and electronic equipment provided with the element |
JP4016983B2 (ja) * | 2004-12-07 | 2007-12-05 | 株式会社村田製作所 | 圧電薄膜共振子およびその製造方法 |
CN100547919C (zh) * | 2005-03-28 | 2009-10-07 | 京瓷株式会社 | 弹性表面波共振子以及通信装置 |
JP4641036B2 (ja) * | 2005-10-27 | 2011-03-02 | 京セラ株式会社 | 弾性表面波装置および通信装置 |
JPWO2008149619A1 (ja) * | 2007-06-06 | 2010-08-19 | 株式会社村田製作所 | 弾性波フィルタ装置 |
JP4930595B2 (ja) * | 2007-09-06 | 2012-05-16 | 株式会社村田製作所 | 圧電共振子 |
DE112009002273B4 (de) * | 2008-09-22 | 2015-06-25 | Murata Manufacturing Co., Ltd. | Filtervorrichtung für elastische Wellen |
JP5713025B2 (ja) * | 2010-12-24 | 2015-05-07 | 株式会社村田製作所 | 弾性波装置及びその製造方法 |
FI124732B (en) | 2011-11-11 | 2014-12-31 | Teknologian Tutkimuskeskus Vtt | Laterally connected bulk wave filter with improved passband characteristics |
US9452447B2 (en) * | 2013-12-27 | 2016-09-27 | General Electric Company | Ultrasound transducer and ultrasound imaging system with a variable thickness dematching layer |
CN107615657B (zh) * | 2015-06-25 | 2020-12-01 | 株式会社村田制作所 | 弹性波装置 |
US10715105B2 (en) * | 2016-06-24 | 2020-07-14 | Murata Manufacturing Co., Ltd. | Acoustic wave device |
US10601398B2 (en) * | 2018-04-13 | 2020-03-24 | Qorvo Us, Inc. | BAW structure having multiple BAW transducers over a common reflector, which has reflector layers of varying thicknesses |
US11549913B2 (en) * | 2018-05-10 | 2023-01-10 | Vanguard International Semiconductor Singapore Pte. Ltd. | Shear-mode chemical/physical sensor for liquid environment sensing and method for producing the same |
US10530334B2 (en) * | 2018-05-10 | 2020-01-07 | Globalfoundries Singapore Pte. Ltd. | Acoustic wave filter formed on a V-groove topography and method for producing the same |
-
2016
- 2016-01-14 KR KR1020177020801A patent/KR101923572B1/ko active IP Right Grant
- 2016-01-14 CN CN201680012264.6A patent/CN107251427B/zh active Active
- 2016-01-14 WO PCT/JP2016/051030 patent/WO2016147688A1/ja active Application Filing
-
2017
- 2017-08-17 US US15/679,327 patent/US11146233B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005159606A (ja) * | 2003-11-25 | 2005-06-16 | Tdk Corp | 圧電薄膜共振器およびその製造方法 |
JP2007129391A (ja) * | 2005-11-02 | 2007-05-24 | Matsushita Electric Ind Co Ltd | 音響共振器及びフィルタ |
JP2007208845A (ja) * | 2006-02-03 | 2007-08-16 | Matsushita Electric Ind Co Ltd | 圧電共振器 |
WO2009029134A1 (en) * | 2007-08-24 | 2009-03-05 | Maxim Integrated Products, Inc | Deposition of piezoelectric aln for baw resonators |
WO2012086441A1 (ja) * | 2010-12-24 | 2012-06-28 | 株式会社村田製作所 | 弾性波装置及びその製造方法 |
JP2014176095A (ja) * | 2013-03-12 | 2014-09-22 | Triquint Semiconductor Inc | 強固に固定されたバルク弾性波共振器における境界リングモード抑制 |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10924080B2 (en) | 2017-02-21 | 2021-02-16 | Murata Manufacturing Co., Ltd. | Acoustic wave device, high frequency front-end circuit, and communication device |
KR102280166B1 (ko) * | 2017-02-21 | 2021-07-20 | 가부시키가이샤 무라타 세이사쿠쇼 | 탄성파 장치, 고주파 프론트엔드 회로 및 통신 장치 |
KR20190103411A (ko) * | 2017-02-21 | 2019-09-04 | 가부시키가이샤 무라타 세이사쿠쇼 | 탄성파 장치, 고주파 프론트엔드 회로 및 통신 장치 |
KR102243352B1 (ko) | 2017-06-23 | 2021-04-21 | 가부시키가이샤 무라타 세이사쿠쇼 | 탄성파 장치, 고주파 프론트엔드 회로 및 통신 장치 |
CN110809857A (zh) * | 2017-06-23 | 2020-02-18 | 株式会社村田制作所 | 弹性波装置、高频前端电路以及通信装置 |
JPWO2018235731A1 (ja) * | 2017-06-23 | 2020-04-02 | 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および通信装置 |
KR20200007963A (ko) * | 2017-06-23 | 2020-01-22 | 가부시키가이샤 무라타 세이사쿠쇼 | 탄성파 장치, 고주파 프론트엔드 회로 및 통신 장치 |
WO2018235731A1 (ja) * | 2017-06-23 | 2018-12-27 | 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および通信装置 |
WO2018235605A1 (ja) * | 2017-06-23 | 2018-12-27 | 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および通信装置 |
US11309862B2 (en) | 2017-06-23 | 2022-04-19 | Murata Manufacturing Co., Ltd | Acoustic wave device, high frequency front end circuit, and communication apparatus |
KR20200043455A (ko) | 2017-09-27 | 2020-04-27 | 가부시키가이샤 무라타 세이사쿠쇼 | 탄성파 장치 및 탄성파 장치의 제조 방법 |
DE112018005526T5 (de) | 2017-09-27 | 2020-07-09 | Murata Manufacturing Co., Ltd. | Schallwellenvorrichtung und Verfahren zur Herstellung einer Schallwellenvorrichtung |
US11309866B2 (en) | 2017-09-27 | 2022-04-19 | Murata Manufacturing Co., Ltd | Acoustic wave device and method for manufacturing acoustic wave device |
DE112018005526B4 (de) | 2017-09-27 | 2023-06-29 | Murata Manufacturing Co., Ltd. | Schallwellenvorrichtung und Verfahren zur Herstellung einer Schallwellenvorrichtung |
WO2022244746A1 (ja) * | 2021-05-20 | 2022-11-24 | 株式会社村田製作所 | 弾性波装置及びその製造方法 |
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