WO2022138443A1 - 弾性波装置 - Google Patents
弾性波装置 Download PDFInfo
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- WO2022138443A1 WO2022138443A1 PCT/JP2021/046509 JP2021046509W WO2022138443A1 WO 2022138443 A1 WO2022138443 A1 WO 2022138443A1 JP 2021046509 W JP2021046509 W JP 2021046509W WO 2022138443 A1 WO2022138443 A1 WO 2022138443A1
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- WIPO (PCT)
- Prior art keywords
- elastic wave
- sound velocity
- wave device
- layer
- piezoelectric layer
- Prior art date
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- 239000003989 dielectric material Substances 0.000 claims abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 16
- 229910000505 Al2TiO5 Inorganic materials 0.000 claims description 4
- 229910052582 BN Inorganic materials 0.000 claims description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 8
- 229910052581 Si3N4 Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000001902 propagating effect Effects 0.000 description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910016570 AlCu Inorganic materials 0.000 description 1
- 229910003327 LiNbO3 Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 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
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- H03H9/02543—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
- H03H9/02637—Details concerning reflective or coupling arrays
-
- 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
- H03H9/14541—Multilayer finger or busbar electrode
-
- 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
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
Definitions
- the present invention relates to an elastic wave device having a structure in which a low sound velocity layer and a piezoelectric layer are laminated on a high sound velocity member.
- an elastic wave device in which an IDT electrode is provided on a composite substrate having a piezoelectric layer has been obtained.
- a low sound velocity layer made of silicon oxide and a piezoelectric layer made of LiTaO 3 are laminated on a high sound velocity substrate made of a high sound velocity material.
- An IDT electrode is provided on this piezoelectric layer.
- elastic waves can be effectively confined in the piezoelectric layer, and the Q value can be increased.
- a wide specific band may be required for elastic wave resonators used in band-passing filters and the like. However, it has been difficult to sufficiently widen the specific band with the conventional elastic wave device.
- An object of the present invention is to provide an elastic wave device having a wide specific band.
- the elastic wave device has a high sound velocity member, a low sound velocity layer laminated on the high sound velocity member, a piezoelectric layer directly or indirectly laminated on the low sound velocity layer, and a piezoelectric layer on the piezoelectric layer.
- the low sound velocity layer is provided with an provided electrode, and is composed of a dielectric material having a Young's modulus lower than that of silicon oxide, or a layer containing the dielectric material as a main component.
- FIG. 1 is a front sectional view showing a main part of an elastic wave device according to a first embodiment of the present invention.
- FIG. 2 is a schematic plan view showing the electrode structure of the elastic wave device of the first embodiment.
- FIG. 3 is a diagram showing impedance-frequency characteristics as elastic wave resonators of the elastic wave devices of Example 1 and Comparative Example 1.
- FIG. 4 is a diagram showing impedance-frequency characteristics as elastic wave resonators of the elastic wave devices of Example 2 and Comparative Example 2.
- FIG. 5 is a diagram showing the relationship between the material of the low sound velocity layer in the elastic wave device using the LiTaO 3 film as the piezoelectric layer and the specific band.
- FIG. 6 is a diagram showing the relationship between the material of the low sound velocity layer in the elastic wave device using the LiNbO3 film as the piezoelectric layer and the specific band.
- FIG. 7 is a front sectional view showing a main part of the elastic wave device according to the second embodiment of the present invention.
- FIG. 1 is a front sectional view showing a main part of an elastic wave device according to a first embodiment of the present invention
- FIG. 2 is a schematic plan view showing an electrode structure thereof.
- the IDT electrode 7 is provided on the piezoelectric composite substrate 6.
- the IDT electrode 7 has a plurality of first electrode fingers 7a interspersed with each other and a plurality of second electrode fingers 7b.
- the elastic wave device 1 is an elastic wave resonator. As shown in FIG. 2, reflectors 8 and 9 are provided on both sides of the IDT electrode 7 in the elastic wave propagation direction.
- the IDT electrode 7 and the reflectors 8 and 9 can be made of an appropriate metal or alloy. Further, the IDT electrode 7 and the reflectors 8 and 9 may be made of a laminated body of a plurality of metal films.
- the high sound velocity member 3, the low sound velocity layer 4, and the piezoelectric layer 5 are laminated on the support substrate 2.
- the support substrate 2 is made of Si.
- the support substrate 2 can also be made of another appropriate dielectric or semiconductor.
- the high sound velocity member 3 is made of a high sound velocity material.
- the high sound velocity material means a material in which the sound velocity of the propagating bulk wave is higher than the sound velocity of the elastic wave propagating in the piezoelectric layer 5.
- Such high-pitched materials include aluminum oxide, silicon carbide, silicon nitride, silicon oxynitride, silicon, sapphire, lithium tantalate, lithium niobate, crystal, alumina, zirconia, cozilite, mulite, steatite, and forsterite. , Magnesia, DLC (diamond-like carbon) film or diamond, a medium containing the above material as a main component, a medium containing a mixture of the above materials as a main component, and the like.
- the high sound velocity member 3 is made of SiN as silicon nitride.
- the low sound velocity layer 4 is made of a low sound velocity material in which the sound velocity of the propagating bulk wave is lower than the sound velocity of the bulk wave propagating in the piezoelectric layer 5.
- the low sound velocity layer 4 is made of a dielectric material having a Young's modulus lower than that of silicon oxide.
- the dielectric material is not particularly limited, and one kind of material selected from the group consisting of aluminum titanate, boron nitride, carbon-containing silicon oxide, and nitrogen-containing silicon carbide can be used.
- the low sound velocity layer 4 is made of AlTiO 4 as aluminum titanate.
- the Young's modulus of AlTiO 4 is 13 GPa, and the Young's modulus of silicon oxide is 73 GPa.
- the piezoelectric layer 5 is made of a piezoelectric single crystal, and lithium tantalate (LiTaO 3 ) is used as such a piezoelectric single crystal. Lithium niobate may be used.
- the piezoelectric layer 5 may be indirectly laminated on the low sound velocity layer 4.
- the piezoelectric composite substrate 6 Since the piezoelectric composite substrate 6 has the above-mentioned laminated structure, elastic waves can be effectively confined in the piezoelectric layer 5. Therefore, the Q value can be increased.
- the low sound velocity layer 4 is made of a dielectric material having a Young's modulus lower than that of silicon oxide, the specific band can be effectively widened as is clear from the experimental examples described later.
- the specific band in the elastic wave resonator is expressed as (fa-fr) / fr when the resonance frequency is fr and the antiresonance frequency is fa.
- Example 1 As Example 1, an elastic wave device having the following configuration was produced.
- Si having a plane orientation of (111) plane and a third Euler angle of 73 ° was used.
- a SiN film having a thickness of 300 nm was used.
- AlTIO 4 having a Young's modulus of 13 GPa was used, and the film thickness was set to 400 nm.
- a 35 ° Y-cut X-propagation LiTaO 3 film was used, and the thickness was set to 300 nm.
- a Ti / AlCu / Ti laminate was used for the IDT electrode 7.
- the film thickness was 12 nm / 100 nm / 4 nm from the upper surface side opposite to the piezoelectric layer 5.
- the logarithm of the electrode fingers of the IDT electrode 7 was 100 pairs, the crossing width was 40 ⁇ m, and the wavelength ⁇ determined by the electrode finger pitch was 2 ⁇ m.
- the crossover width is the direction in which the first and second electrode fingers 7a and 7b extend in the region where the adjacent first and second electrode fingers 7a and 7b overlap when viewed from the elastic wave propagation direction. It is a dimension along.
- an elastic wave device of Comparative Example 1 was prepared in the same manner as in Example 1 except that a silicon oxide film having a thickness of 300 nm was used for the low sound velocity layer 4.
- FIG. 3 is a diagram showing resonance characteristics of the elastic wave devices of Example 1 and Comparative Example 1 as elastic wave resonators. As is clear from FIG. 3, according to the first embodiment as compared with the first comparative example, the resonance frequency can be shifted to the lower frequency side. Therefore, the specific band is widened.
- Example 2 Next, as Example 2, an elastic wave device using BN as boron nitride in the low sound velocity layer 4 was produced.
- the Young's modulus of BN was 10 GPa, and its thickness was 400 nm.
- the logarithm of the electrode fingers of the IDT electrode 7 was 100 pairs, the crossing width was 40 ⁇ m, and the wavelength determined by the electrode finger pitch was 2 ⁇ m.
- Other configurations were the same as in Example 1.
- an elastic wave device of Comparative Example 2 was prepared in the same manner as in Example 2 except that a silicon oxide film having a thickness of 300 nm was used as the low sound velocity layer 4.
- FIG. 4 is a diagram showing impedance-frequency characteristics as elastic wave resonators of the elastic wave devices of Example 2 and Comparative Example 2. As is clear from FIG. 4, according to the second embodiment, the resonance frequency is shifted to the lower frequency side and the specific band is wider than that of the second comparative example.
- the low sound velocity layer 4 is made of a dielectric material having a Young's modulus lower than that of silicon oxide, the specific band of the elastic wave device is effective. It turns out that it can be expanded.
- the low sound velocity layer 4 may contain the dielectric material as a main component. That is, the low sound velocity layer 4 may be a layer containing the dielectric material as a main component.
- a dielectric material having a Young's modulus lower than that of silicon oxide is used as the material constituting the low sound velocity layer 4.
- a dielectric material AlTIO 4 as aluminum titanate, BN as boron nitride, SiOC as carbon-containing silicon oxide, SiCN as nitrogen-containing silicon carbide, and the like can be preferably used.
- Example 3 a high sound velocity member 3 made of silicon nitride (SiN) having a thickness of 300 nm is laminated on a support substrate 2 made of Si, and elastic by using various dielectric materials of 200 nm as a low sound velocity layer 4. A wave device was configured.
- SiN silicon nitride
- a LiTaO 3 film having a thickness of 400 nm and propagating 40 ° Y-cut X was used.
- the laminated structure of the electrodes was the same as in Example 1.
- the wavelength ⁇ determined by the electrode finger pitch of the IDT electrode 7 was 2 ⁇ m, the logarithm of the electrode fingers was 100 pairs, and the crossing width was 40 ⁇ m.
- SiOC SiOC
- AlTiO 4 SiCN
- BN boron triboride
- a low sound velocity layer 4 composed of SiO 2 was also prepared.
- the Young's modulus of SiOC, AlTiO 4 , SiCN, BN and SiO 2 is as shown in Table 1 below.
- Example 4 An elastic wave device using each dielectric material as the low sound velocity layer 4 in the same manner as in Example 3 except that the piezoelectric layer 5 made of a LiNbO 3 film having a thickness of 400 nm and propagating 30 ° Y-cut is used. was configured.
- the resonance characteristics of each elastic wave device were measured, and the specific band was determined. The results are shown in FIG. As shown in FIG. 6, it can be seen that the specific band can be widened when SiOC, AlTIO 4 , SiCN or BN is used as compared with the case where the dielectric material constituting the low sound velocity layer 4 is SiO 2 . As described above, in the present invention, the specific band can be effectively expanded even when LiNbO 3 is used as the piezoelectric layer 5.
- FIG. 7 is a front sectional view of the elastic wave device showing a main part of the elastic wave device according to the second embodiment of the present invention.
- the high sound velocity member 3 is a support substrate made of a high sound velocity material. In this case, the high sound velocity member as a separate material from the support substrate can be omitted. In other structures, the elastic wave device 21 is the same as the elastic wave device 1 shown in FIG.
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
実施例1として、以下の構成の弾性波装置を作製した。
次に、実施例2として、低音速層4に窒化ホウ素としてのBNを用いた弾性波装置を作製した。BNのヤング率は10GPaであり、その厚みを400nmとした。IDT電極7の電極指の対数は100対、交差幅=40μm、電極指ピッチで定まる波長は2μmとした。その他の構成は、実施例1と同様とした。比較のために、厚み300nmの酸化ケイ素膜を低音速層4として用いたことを除いては、実施例2と同様にして、比較例2の弾性波装置を用意した。
実施例3では、Siからなる支持基板2上に、300nmの厚みの窒化シリコン(SiN)からなる高音速部材3を積層し、低音速層4として、200nmの各種誘電体材料を用いることにより弾性波装置を構成した。
厚み400nmの30°YカットX伝搬のLiNbO3膜からなる圧電層5を用いたことを除いては、実施例3と同様にして、各誘電体材料を低音速層4として用いた弾性波装置を構成した。実施例3と同様にして、各弾性波装置の共振特性を測定し、比帯域を求めた。結果を図6に示す。図6に示すように、低音速層4を構成している誘電体材料がSiO2の場合に比べて、SiOC、AlTiO4、SiCNまたはBNを用いた場合、比帯域を広げ得ることがわかる。このように、本発明においては、圧電層5として、LiNbO3を用いた場合においても、比帯域を効果的に広げることができる。
2…支持基板
3…高音速部材
4…低音速層
5…圧電層
6…圧電複合基板
7…IDT電極
7a,7b…第1,第2の電極指
8,9…反射器
Claims (6)
- 高音速部材と、
前記高音速部材上に積層された低音速層と、
前記低音速層上に直接または間接に積層された圧電層と、
前記圧電層上に設けられた電極と、
を備え、
前記低音速層が、酸化ケイ素よりもヤング率が低い誘電体材料、あるいは当該誘電体材料を主成分とする層からなる、弾性波装置。 - 前記誘電体材料が、チタン酸アルミニウム、窒化ホウ素、炭素含有酸化シリコン及び窒素含有シリコンカーバイドからなる群から選択された1種の材料からなる、請求項1に記載の弾性波装置。
- 支持基板をさらに備え、
前記支持基板上に前記高音速部材が積層されている、請求項1または2に記載の弾性波装置。 - 前記高音速部材が、高音速材料からなる支持基板である、請求項1または2に記載の弾性波装置。
- 前記支持基板がシリコン基板である、請求項3または4に記載の弾性波装置。
- 前記圧電層が、タンタル酸リチウムまたはニオブ酸リチウムからなる、請求項1~5のいずれか1項に記載の弾性波装置。
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JP2022571375A JPWO2022138443A1 (ja) | 2020-12-22 | 2021-12-16 | |
CN202180076836.8A CN116458062A (zh) | 2020-12-22 | 2021-12-16 | 弹性波装置 |
KR1020237016590A KR20230088466A (ko) | 2020-12-22 | 2021-12-16 | 탄성파 장치 |
US18/136,372 US20230261638A1 (en) | 2020-12-22 | 2023-04-19 | Acoustic wave device |
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US18/136,372 Continuation US20230261638A1 (en) | 2020-12-22 | 2023-04-19 | Acoustic wave device |
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JP2018182615A (ja) * | 2017-04-18 | 2018-11-15 | 株式会社村田製作所 | 弾性波装置 |
WO2020122005A1 (ja) * | 2018-12-10 | 2020-06-18 | 株式会社村田製作所 | 弾性波装置 |
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JP2018182615A (ja) * | 2017-04-18 | 2018-11-15 | 株式会社村田製作所 | 弾性波装置 |
WO2020122005A1 (ja) * | 2018-12-10 | 2020-06-18 | 株式会社村田製作所 | 弾性波装置 |
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CN116458062A (zh) | 2023-07-18 |
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