WO2016063738A1 - 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
- Publication number
- WO2016063738A1 WO2016063738A1 PCT/JP2015/078583 JP2015078583W WO2016063738A1 WO 2016063738 A1 WO2016063738 A1 WO 2016063738A1 JP 2015078583 W JP2015078583 W JP 2015078583W WO 2016063738 A1 WO2016063738 A1 WO 2016063738A1
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- Prior art keywords
- wiring
- insulating film
- interlayer insulating
- dielectric material
- wave device
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000011229 interlayer Substances 0.000 claims abstract description 130
- 239000003989 dielectric material Substances 0.000 claims abstract description 52
- 239000000758 substrate Substances 0.000 claims abstract description 50
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- 238000005530 etching Methods 0.000 claims description 27
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- 229910018565 CuAl Inorganic materials 0.000 claims description 4
- 229910000765 intermetallic Inorganic materials 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- 239000010408 film Substances 0.000 description 118
- 229910052751 metal Inorganic materials 0.000 description 17
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- 229920005989 resin Polymers 0.000 description 15
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- 229910045601 alloy Inorganic materials 0.000 description 7
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- 229910016570 AlCu Inorganic materials 0.000 description 4
- 238000000059 patterning Methods 0.000 description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
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- 239000000057 synthetic resin Substances 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- 238000004544 sputter deposition Methods 0.000 description 2
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- 229910017931 Cu—Si Inorganic materials 0.000 description 1
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 239000000919 ceramic Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 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 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 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
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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
- H03H9/125—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
- 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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02897—Means for compensation or elimination of undesirable effects of strain or mechanical damage, e.g. strain due to bending 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
- H03H9/05—Holders; Supports
- H03H9/10—Mounting in enclosures
- H03H9/1064—Mounting in enclosures for surface acoustic wave [SAW] devices
- H03H9/1071—Mounting in enclosures for surface acoustic wave [SAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the SAW device
-
- 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
- H03H9/05—Holders; Supports
- H03H9/10—Mounting in enclosures
- H03H9/1064—Mounting in enclosures for surface acoustic wave [SAW] devices
- H03H9/1092—Mounting in enclosures for surface acoustic wave [SAW] devices the enclosure being defined by a cover cap mounted on an element forming part of the surface acoustic wave [SAW] device on the side of the IDT's
-
- 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
- H03H9/54—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
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
Definitions
- the present invention relates to an acoustic wave device having a portion where a plurality of wirings are three-dimensionally crossed on a piezoelectric substrate, and a method for manufacturing the same.
- Patent Document 1 a structure in which wirings are three-dimensionally crossed via an inorganic insulating film on a piezoelectric substrate is known.
- a wiring having an IDT electrode and a three-dimensional intersection is formed on a piezoelectric substrate.
- a hollow portion is configured by laminating a support member made of resin and a lid material on the piezoelectric substrate.
- Patent Document 2 an IDT electrode and a wiring having a three-dimensional intersection are provided on a piezoelectric substrate. And the solid intersection part is exposed to the opening provided in the support member so that the support member made of resin does not cover the solid intersection part.
- Patent Document 3 discloses a three-dimensional intersection portion of a wiring having an interlayer insulating film made of resin on a substrate.
- Patent Document 2 the three-dimensional intersection is not covered with a support member made of resin. Therefore, the thermal stress can be relaxed. However, the degree of freedom in design is reduced, and downsizing becomes difficult. In addition, cracks and poor elasticity in the wiring on the inorganic insulating film may still occur.
- the interlayer insulating film is made of resin. Therefore, the surface of the interlayer insulating film is rounded. Therefore, cracks and disconnections in the upper wiring are unlikely to occur.
- the interlayer insulating film made of resin has a problem that a large thermal stress is easily generated in the wiring on the insulating layer because the difference in linear expansion coefficient between the piezoelectric substrate and the resin is large.
- An object of the present invention is to provide an acoustic wave device that uses an interlayer insulating film made of an inorganic dielectric material and is unlikely to cause cracks or breaks in wiring on the interlayer insulating film.
- An acoustic wave device is provided on a piezoelectric substrate, a plurality of IDT electrodes provided on the piezoelectric substrate, and the piezoelectric substrate, and electrically connects the plurality of IDT electrodes.
- a plurality of wirings, wherein the plurality of wirings include a first wiring and a second wiring connected to a different potential from the first wiring.
- the second wiring includes a part of the first wiring and the interlayer Three-dimensionally intersecting via an insulating film, and at the three-dimensionally intersecting portion, is extended from a region outside the interlayer insulating film to a region where the interlayer insulating film is provided, and the interlayer insulating film Is laminated on the lower surface of the second wiring in a region outside In the region where the interlayer insulating film is provided, further comprising the interlayer insulating film and is positioned below the second wiring, the first auxiliary wiring electrodes.
- the first auxiliary wiring electrode is provided on both one side and the other side of the first wiring at the three-dimensionally intersecting portion. .
- the crack and disconnection failure of the second wiring can be effectively suppressed on both the one side and the other side of the first wiring.
- the interlayer insulating film includes first and second side surfaces located on one side and the other side of the first wiring, The first side surface and the second side surface are inclined surfaces that are inclined so as to be located at the center of the interlayer insulating film as they go upward.
- the first side surface and the second side surface are As the interface between one auxiliary wiring electrode and the second wiring approaches the interlayer insulating film, the interface is inclined upward, and the piezoelectric substrate on the first and second side surfaces of the interlayer insulating film An inclination angle with respect to the upper surface of the piezoelectric substrate is larger than an inclination angle of the interface between the first auxiliary wiring electrode and the second wiring with respect to the upper surface of the piezoelectric substrate. In this case, the crack and disconnection failure of the second wiring can be more effectively suppressed.
- the surface roughness in the portion where the second wiring of the first auxiliary wiring electrode is laminated is the interlayer of the first auxiliary wiring electrode. It is larger than the surface roughness in the portion covered with the insulating film. In this case, the adhesion strength between the layers can be effectively increased.
- a portion of the first auxiliary wiring electrode that is in contact with the second wiring is an Al alloy layer containing Cu, and the CuAl 2 intermetallic compound is used. It has a convex part. In this case, the surface roughness can be effectively increased.
- the first wiring extends in the extending direction, and is stacked on the first wiring in a region outside the interlayer insulating film, A second auxiliary wiring electrode is further provided which reaches the interlayer insulating film and is separated from the second wiring.
- the influence due to the etching of the first wiring or the like can be mitigated, and an increase in wiring resistance can be suppressed.
- the inclination angle of the first and second side surfaces of the interlayer insulating film is 50 ° or less. In this case, cracks and disconnections of the second wiring can be more effectively suppressed.
- the first and second side surfaces of the interlayer insulating film include a lower side surface portion having a relatively large inclination angle and an upper portion having a relatively small inclination angle. And a side portion.
- the interlayer insulating film is formed on the first dielectric material layer made of the first inorganic dielectric material and the first dielectric material layer. And a stacked second dielectric material layer.
- a first dielectric material layer in which the interlayer insulating film is made of a first inorganic dielectric material and a first dielectric material different from the first inorganic dielectric material A second dielectric material layer made of two inorganic dielectric materials, and a side surface of the first dielectric material layer constitutes the lower side surface portion of the second dielectric material layer. A side surface constitutes the upper side surface portion.
- a support member provided on the piezoelectric substrate and provided so as to surround the IDT electrode so as to form a hollow portion facing the IDT electrode; And a lid member provided on the support member for sealing the hollow portion.
- the support member is provided so as to reach at least one of the three-dimensionally intersecting portions.
- a method of manufacturing an acoustic wave device is to obtain an acoustic wave device configured according to the present invention, the step of forming the IDT electrode on the piezoelectric substrate, and the first method on the piezoelectric substrate.
- the first auxiliary wiring electrode is formed by a photolithography-etching method.
- the interlayer insulating film is formed by dry etching of the interlayer insulating film.
- the interlayer insulating film includes a first inorganic dielectric material layer made of a first inorganic dielectric material, and the first inorganic dielectric.
- a second inorganic dielectric material layer made of a second inorganic dielectric material different from the body material, and etching the first inorganic dielectric material layer and the second inorganic dielectric material layer by an etching method.
- the etching rate of the first inorganic dielectric material layer is set higher than the etching rate of the second inorganic dielectric material layer.
- FIG. 1 (a) and 1 (b) are a partially cutaway plan view showing a three-dimensionally crossed portion of the acoustic wave device according to the first embodiment of the present invention in an enlarged manner and I-- in FIG. 1 (a). It is sectional drawing which follows an I line.
- 2A and 2B are a front sectional view of the acoustic wave device according to the first embodiment of the present invention and a schematic plan view showing an electrode structure on the piezoelectric substrate.
- FIG. 3 is a front cross-sectional view showing a three-dimensional intersection of an elastic wave device according to the second embodiment of the present invention.
- FIG. 4 is a front sectional view showing a three-dimensional intersection of an acoustic wave device according to the third embodiment of the present invention.
- FIG. 5 (a) and 5 (b) are partially cutaway plan views of the three-dimensional intersection of the acoustic wave device according to the fourth embodiment of the present invention and along the line II-II in FIG. 5 (a).
- It is sectional drawing of a part. 6 (a) and 6 (b) are partial cutaway plan views of a three-dimensional intersection of an acoustic wave device according to a fifth embodiment of the present invention and along the line III-III in FIG. 6 (a).
- It is sectional drawing of a part. 7 (a) and 7 (b) are partially cutaway plan views of a three-dimensional intersection of an acoustic wave device according to a sixth embodiment of the present invention and along the line IV-IV in FIG. 7 (a).
- FIG. 8 is a front sectional view of a three-dimensional intersection of an acoustic wave device according to a seventh embodiment of the present invention.
- FIG. 2 (a) and 2 (b) are a front sectional view of the acoustic wave device according to the first embodiment of the present invention and a schematic plan view showing an electrode structure on the piezoelectric substrate.
- FIG. 2B the structure in which the lid member 5 and the bumps 8a and 8b in FIG. 2A are removed is schematically shown in a plan view.
- FIG. 2 (a) shows a cross section of the acoustic wave device 1 along the line AA in FIG. 2 (b).
- the acoustic wave device 1 has a piezoelectric substrate 2.
- the piezoelectric substrate 2 is made of a piezoelectric single crystal such as LiTaO 3 or LiNbO 3 .
- the piezoelectric substrate 2 may be made of piezoelectric ceramics.
- At least one IDT electrode 3 is provided on the piezoelectric substrate 2.
- a plurality of IDT electrodes are provided to constitute an elastic wave filter.
- FIG. 2B the portion where the IDT electrode and the reflector are formed is schematically shown by a symbol in which X is surrounded by a rectangular frame.
- a 3IDT type longitudinally coupled resonator type acoustic wave filter 9 a and a plurality of acoustic wave resonators 9 b are provided on the piezoelectric substrate 2.
- the longitudinally coupled resonator type acoustic wave filter 9a three IDT electrodes are provided along the acoustic wave propagation direction. Reflectors are provided on both sides of the region where the three IDT electrodes are provided. That is, the longitudinally coupled resonator type acoustic wave filter 9a is a 3IDT type longitudinally coupled resonator type acoustic wave filter.
- Each of the plurality of acoustic wave resonators 9b is a one-port resonator in which reflectors are provided on both sides of the IDT electrode.
- These 1-port type acoustic wave resonators 9b and longitudinally coupled resonator type acoustic wave filters 9a are electrically connected to each other by wiring electrodes 10.
- the characteristic of the elastic wave device 1 is the structure of the three-dimensional intersection B of the wiring.
- 1 (a) and 1 (b) are a partially cutaway plan view showing a three-dimensional intersection B in an enlarged manner and a cross-sectional view taken along the line II in FIG. 1 (a).
- the first wiring 11 and the second wiring 12 are three-dimensionally crossed via the interlayer insulating film 13. More specifically, the first wiring 11 is extended in the first direction on the piezoelectric substrate 2.
- the first direction means a direction in which the first wiring 11 extends in the three-dimensional intersection B.
- the second wiring 12 is connected to a potential different from that of the first wiring 11.
- An interlayer insulating film 13 made of an inorganic dielectric material is provided so as to cover the first wiring 11.
- a second wiring 12 extending in a second direction which is a direction orthogonal to the first direction is provided on the interlayer insulating film 13. Therefore, insulation between the first wiring 11 and the second wiring 12 is achieved via the interlayer insulating film 13.
- the direction in which the second wiring extends in the three-dimensional intersection is the second direction.
- this 2nd direction should just be a direction which cross
- the feature of this embodiment is that the first auxiliary wiring electrodes 14 and 15 are provided in the three-dimensional intersection B.
- the first auxiliary wiring electrodes 14 and 15 are provided on the piezoelectric substrate 2 and extend in the second direction.
- a first auxiliary wiring electrode 14 is provided on one side of the first wiring 11, and a first auxiliary wiring electrode 15 is provided on the other side.
- the first auxiliary wiring electrode 14 is disposed so as to extend from a region outside the interlayer insulating film 13 to a region where the interlayer insulating film 13 is provided in the second direction.
- the first auxiliary wiring electrode 15 is also arranged in the second direction so as to extend from a region outside the portion where the interlayer insulating film 13 is provided to a region where the interlayer insulating film 13 is provided.
- the inner ends 14 a and 15 a of the first auxiliary wiring electrodes 14 and 15 are separated from the first wiring 11 through the interlayer insulating film 13.
- the inner end is an end located on the center side of the interlayer insulating film 13.
- the interlayer insulating film 13 has an upper surface 13a and first and second side surfaces 13b and 13c.
- the first side surface 13b and the second side surface 13c are inclined surfaces that are inclined toward the center side of the interlayer insulating film 13 as going upward.
- the first wiring 11 and the second wiring 12 are electrically connected to the IDT electrode 3 constituting the acoustic wave resonator 9b and the longitudinally coupled resonator type acoustic wave filter 9a shown in FIG. ing.
- the first wiring 11 is preferably formed of the same material as the IDT electrode at the same time. Thereby, the manufacturing process can be simplified.
- the metal material for forming the first wiring 11 and the IDT electrode is not particularly limited. Metals such as Al, Pt, Cu, Au, Ti, Ag, W, Ni, Cr or Mo can be used. Further, the metal is not limited to a pure metal but may be an alloy. Furthermore, the IDT electrode and the first wiring 11 may be formed of a single metal layer, or may be a stacked metal film formed by stacking a plurality of metal layers.
- first auxiliary wiring electrodes 14 and 15 are also formed of the same material and the same process as the first wiring 11 and the IDT electrode.
- the first wiring 11 and the first auxiliary wiring electrodes 14 and 15 are made of a laminated metal film having an AlCu layer on the top. More specifically, it has a structure in which a Ti film and an AlCu layer are stacked on a piezoelectric substrate.
- the first wiring 11, the IDT electrode, and the first auxiliary wiring electrodes 14 and 15 can be formed by a thin film forming method such as vapor deposition or sputtering.
- the IDT electrode, the first wiring 11 and the first auxiliary wiring electrodes 14 and 15 having a predetermined shape are formed by etching after forming a metal film by such a film forming method. desirable.
- the interlayer insulating film 13 is made of an inorganic dielectric material. Such a material is not particularly limited as long as it is an inorganic dielectric material. For example, silicon oxide, silicon nitride, silicon oxynitride, silicon carbide, tantalum oxide, titanium oxide, titanium nitride, alumina, and the like can be used. . In the present embodiment, the interlayer insulating film 13 is made of silicon oxide.
- the interlayer insulating film 13 is obtained by forming an insulating film by a film forming method such as sputtering or vapor deposition and then patterning it by a photolithography-etching method.
- the etching method is not particularly limited, and dry etching or wet etching may be selected according to the type of the inorganic dielectric material.
- the cross-sectional shape of the photoresist is rounded, so that the cross-sectional shape of the resist that is rounded can be transferred to the patterned interlayer insulating film 13 by dry etching.
- the second wiring 12 is formed.
- the second wiring 12 is made of a laminated film of Ti, AlCu, and Pt.
- the material forming the second wiring 12 is not particularly limited, and the same metal material as that of the first wiring 11 can be used.
- the second wiring 12 may also be a single layer or a laminated metal film formed by laminating a plurality of metal layers.
- the etching method in this case is not particularly limited, but it is preferable to perform etching using an alkaline developer as described later.
- the first auxiliary wiring electrodes 14 and 15 are provided at the three-dimensional intersection B, so that the second wiring 12 on the interlayer insulating film 13 is cracked or disconnected. hard.
- the upper surface of the interlayer insulating film 13 has a height above the portion where the first wiring 11 is provided and outside in the second direction. Will be different. That is, the thickness of the interlayer insulating film 13 is thick immediately above the portion where the first wiring 11 is provided, and the interlayer insulating film is outside the region where the first wiring 11 is provided in the second direction. The height of 13 becomes relatively low, and a step is generated between the two. Therefore, a step is also generated on the second wiring 12 on this step, and when the thermal shock is applied, the second wiring may be cracked or disconnected at the step.
- the inner ends 14a and 15a of the first auxiliary wiring electrodes 14 and 15 are provided so as to reach the inside of the interlayer insulating film 13, the upper surface 13a of the interlayer insulating film 13 is formed.
- the upper portion of the first wiring 11 and the outer portion in the second direction do not change much. Therefore, it is possible to reliably suppress cracks and disconnections of the second wiring 12 in the vicinity of the portions indicated by arrows C1 and C2 in FIG.
- the height between the upper surface 12a of the portion located above the portion of the second wiring 12 where the interlayer insulating film 13 is provided and the upper surface 12b of the second wiring 12 in the outer region is high.
- the height H of the step can be reduced by the thickness of the first auxiliary wiring electrodes 14 and 15. it can. Also by this, cracks and disconnections near the step can be suppressed.
- the elastic wave device 1 is characterized by having the above-mentioned three-dimensional intersection B, and other structures are configured in the same manner as conventionally known elastic wave devices. ing. That is, terminal electrodes 6 a to 6 g are provided on the piezoelectric substrate 2. A support member 4 made of resin is provided on the terminal electrodes 6a to 6g. Under bump metal layers 7 a and 7 b shown in FIG. 2A are provided so as to penetrate through the support member 4. Further, a lid member 5 for forming a hollow portion is joined on the support member 4. The lid member 5 has a structure in which a first synthetic resin layer 5a and a second synthetic resin layer 5b are laminated.
- the cover material 5 may be formed with the single resin layer, or may be formed with materials other than resin.
- the under bump metal layers 7 a and 7 b penetrate the lid member 5 and reach the outer surface of the lid member 5. And bump 8a, 8b is joined on under bump metal layer 7a, 7b.
- the piezoelectric substrate 2, the support member 4, and the lid member 5 constitute a hollow portion where the IDT electrode 3 faces. That is, an acoustic wave device 1 having a so-called wafer level package structure (WLP structure) is configured.
- WLP structure wafer level package structure
- FIGS. 3 to 8 an elastic wave device according to another embodiment of the present invention will be described with reference to FIGS. 3 to 8.
- a three-dimensional intersection portion as a main part will be described.
- the configuration other than the three-dimensional intersection is omitted by using the description of the first embodiment.
- FIG. 3 is a front sectional view showing a three-dimensional intersection in the elastic wave device according to the second embodiment of the present invention.
- a first wiring 11 and first auxiliary wiring electrodes 14 and 15 are formed on the piezoelectric substrate 2.
- An interlayer insulating film 13 is formed so as to cover the first wiring 11.
- the inner ends 14a and 15a of the first auxiliary wiring electrodes 14 and 15 are formed so as to reach the region where the interlayer insulating film 13 is provided, as in the first embodiment.
- a second wiring 12 extending in the second direction is provided so as to cover the interlayer insulating film 13.
- the interface between the first auxiliary wiring electrodes 14 and 15 and the second wiring 12 is inclined so as to go upward as the interlayer insulating film 13 is approached.
- the second embodiment is different from the first embodiment in that the inclination angle X1 of the first side surface 13b located outside the interlayer insulating film 13 in FIG. 3 in the second direction is the first auxiliary wiring.
- the reason is that the inclination angle X2 of the inclined portion of the interface between the electrode 14 and the second wiring 12 is larger.
- an arrow C3 in FIG. 3 it is possible to moderate the change in the stepped portion on the upper surface of the second wiring 12. Therefore, it is possible to suppress cracks and disconnections at the portion indicated by the arrow C3.
- the inclination angle of the second side surface 13 c of the interlayer insulating film 13 is the inclination angle of the inclined portion of the interface between the first auxiliary wiring electrode 15 and the second wiring 12. Is bigger than. Therefore, similarly to the first auxiliary wiring electrode 14 side, the change in the step portion on the upper surface of the second wiring 12 can be moderated.
- the inclination angle of the first and second side surfaces 13b and 13c is preferably 50 ° or less. Thereby, cracks and disconnections of the second wiring 12 can be effectively suppressed.
- Such a structure can be achieved by etching the uppermost layers of the first auxiliary wiring electrodes 14 and 15 with an etching developer for patterning the second wiring 12.
- an etching developer for patterning the second wiring 12 For example, when the surface layer of the first auxiliary wiring electrodes 14 and 15 is a material mainly composed of Al, such as Al or an AlCu alloy, it is desirable to perform etching using an alkaline developer. As a result, the surface layers of the first auxiliary wiring electrodes 14 and 15 are etched, and the inclination angle X2 of the inclined portion at the interface between the second wiring 12 and the first auxiliary wiring electrodes 14 and 15 is determined from the inclination angle X1. Can also be reduced.
- FIG. 4 is a front sectional view showing a three-dimensional intersection of an acoustic wave device according to the third embodiment of the present invention.
- the surface roughness of the surface of the first auxiliary wiring electrodes 14 and 15 that contacts the second wiring 12 is covered with the interlayer insulating film 13 of the first auxiliary wiring electrodes 14 and 15. It is made rougher than the surface roughness of the upper surface in the area. Therefore, the adhesion between the first auxiliary wiring electrodes 14 and 15 and the second wiring 12 can be enhanced.
- the third embodiment is the same as the first embodiment. Accordingly, the same operational effects as those of the first embodiment are obtained.
- the surface roughness of the upper surfaces of the first auxiliary wiring electrodes 14 and 15 is relatively roughened in the portion where the second wiring 12 is laminated. That is, a plurality of convex portions D are formed. These convex portions can be formed by various methods. Preferably, the first auxiliary wiring electrodes 14 and 15 and the interlayer insulating film 13 can be formed after etching. For example, when the upper surfaces of the first auxiliary wiring electrodes 14 and 15 are made of an Al-based alloy containing Cu, it is desirable to perform etching with an alkaline developer. In that case, the convex portion D is formed consisting of CuAl 2 intermetallic compound.
- the convex portion D can be provided on the upper surfaces of the first auxiliary wiring electrodes 14 and 15, and the surface roughness can be increased.
- the elastic wave device by forming the convex portion D, the adhesion strength between the first auxiliary wiring electrodes 14 and 15 and the second wiring 12 is increased, and the second wiring 12 Peeling can be suppressed. Further, since the contact area is increased, the electrical contact resistance between the first auxiliary wiring electrodes 14 and 15 and the second wiring 12 can be reduced. In addition, it becomes difficult to be affected by the surface oxide layer mainly composed of Al, and the contact resistance can be lowered.
- 5 (a) and 5 (b) are a partially cutaway plan view of a three-dimensional intersection according to a fourth embodiment of the present invention and a sectional view taken along the line II-II in FIG. 5 (a). .
- the surface along the line II-II is a cross section extending in the first direction described above.
- the second auxiliary wiring electrodes 21 and 22 are provided from the outside of the interlayer insulating film 13 to the interlayer insulating film 13 in the first direction.
- the second auxiliary wiring electrodes 21 and 22 are separated from the second wiring 12.
- the present embodiment is the same as the first embodiment. Therefore, in the second direction in which the second wiring 12 extends, it has the same structure as the structure shown in FIG.
- the second auxiliary wiring electrodes 21 and 22 are provided so as to extend from the portion covered with the first wiring 11 to the upper surface of the interlayer insulating film 13. . Therefore, the wiring resistance in the first wiring 11 can be reduced.
- the film thickness of the first wiring 11 is not covered with the interlayer insulating film 13. It becomes thin in the part. Therefore, the wiring resistance of the first wiring 11 may increase.
- the second auxiliary wiring electrodes 21 and 22 are stacked, an increase in wiring resistance in the first wiring 11 can be suppressed.
- the second auxiliary wiring electrodes 21 and 22 can be formed of an appropriate metal or alloy. Further, not only a single metal film but also a laminated metal may be used.
- 6 (a) and 6 (b) are partial cutaway plan views of a three-dimensional intersection of an acoustic wave device according to a fifth embodiment of the present invention and along the line III-III in FIG. 6 (a). It is sectional drawing.
- the first wiring 11 and the second wiring 12 are three-dimensionally crossed via the interlayer insulating film 13.
- the first auxiliary wiring electrodes 14 and 15 are provided.
- the fifth embodiment differs from the first embodiment and the second embodiment in that the interlayer insulating film 13 is a first interlayer insulating film layer 13A as a first dielectric material layer below, and the first And having a second interlayer insulating film layer 13B as a second dielectric material layer provided on the interlayer insulating film layer 13A.
- the inclination angle E1 of the side surfaces 13a1, 13a2 of the first interlayer insulating film layer 13A with respect to the upper surface of the piezoelectric substrate 2 is the inclination angle of the side surfaces 13b1, 13b2 of the second interlayer insulating film layer 13B with respect to the upper surface of the piezoelectric substrate 2. It is larger than E2.
- the change of the second wiring 12 on the portions from the side surfaces 13a1, 13a2 to the side surfaces 13b1, 13b2 is made gentle. Therefore, cracks and disconnections in the second wiring 12 can be more effectively suppressed.
- the first interlayer insulating film layer 13A and the second interlayer insulating film layer 13B can be formed by transferring the cross-sectional shape of the resist. That is, when heat treatment is performed after the photoresist is formed, the cross-sectional shape of the patterned resist is rounded. If dry etching is performed in this state, the round cross-sectional shape of the resist can be transferred to the first and second interlayer insulating film layers 13A and 13B.
- the cross-sectional shape of the resist may be different between the case where the first interlayer insulating film layer 13A is formed and the case where the second interlayer insulating film layer 13B is formed.
- first interlayer insulating film layer 13A and the second interlayer insulating film layer 13B may be formed of the same material or different materials.
- FIGS. 7A and 7B are a partially cutaway plan view for explaining a three-dimensional intersection of the acoustic wave device according to the sixth embodiment, and a line IV-IV in FIG. It is sectional drawing which follows.
- the interlayer insulating film 13 includes a first interlayer insulating film layer 13A and a second interlayer insulating film layer 13B.
- the first interlayer insulating film layer 13A and the second interlayer insulating film layer 13B are formed of different dielectric materials.
- the first interlayer insulating film layer 13A and the second interlayer insulating film layer 13B are formed by etching after forming an insulating film. In this case, it is preferable to perform dry etching so that the etching rate when patterning the first interlayer insulating film layer 13A is higher than the etching rate for forming the second interlayer insulating film layer 13B. . Accordingly, as shown in FIG. 7B, the inclination angle E1 can be made larger than the inclination angle E2. That is, the same tilt angle relationship as in the fifth embodiment can be realized.
- the change of the second wiring 12 is performed above the portion where the first interlayer insulating film layer 13A and the second interlayer insulating film layer 13B are connected. Can be relieved. Therefore, the crack and disconnection of the 2nd wiring 12 can be suppressed more effectively.
- the three-dimensional intersections according to the first to sixth embodiments described above may be exposed on the piezoelectric substrate 2 or covered with a support member made of resin or the like in the acoustic wave device.
- a support member made of resin or the like in the acoustic wave device 1 of the first embodiment, the hollow portion is formed by using the support member 4 made of resin.
- the three-dimensional intersection may be covered with the support member 4 as shown in FIG.
- the solid intersection is the same as in FIG. Even if the support member 4 is formed on the three-dimensional intersection B, the stress applied to the second wiring 12 can be reduced by providing the first auxiliary wiring electrodes 14 and 15.
- the pressure at the time of forming the resin layer when the support member 4 is formed may cause the second wiring 12 or the like to be bent or disconnected, but the second wiring 12 may be cracked or disconnected as described above.
- the support member 4 may be provided so as to cover the three-dimensional intersection B. As a result, the acoustic wave device 1 can be reduced in size and the degree of freedom in design can be increased.
- this invention can be widely used not only for the elastic wave apparatus of the WLP structure mentioned above but for the elastic wave apparatus of various structures.
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Abstract
Description
2…圧電基板
3…IDT電極
4…支持部材
5…蓋材
5a,5b…第1,第2の合成樹脂層
6a~6g…端子電極
7a,7b…アンダーバンプメタル層
8a,8b…バンプ
9a…縦結合共振子型弾性波フィルタ
9b…弾性波共振子
10…配線電極
11,12…第1,第2の配線
12a,12b…上面
13…層間絶縁膜
13A,13B…第1,第2の層間絶縁膜層
13a…上面
13a1,13a2…側面
13b,13c…第1,第2の側面
13b1,13b2…側面
14,15…第1の補助配線電極
14a,15a…内側端
21,22…第2の補助配線電極
Claims (16)
- 圧電基板と、
前記圧電基板上に設けられた複数のIDT電極と、
前記圧電基板上に設けられており、前記複数のIDT電極を電気的に接続している複数の配線と、を備え、
前記複数の配線が、第1の配線と、前記第1の配線とは異なる電位に接続される第2の配線とを有し、
前記圧電基板上において、前記第1の配線の一部を被覆するように設けられており、無機誘電体材料からなる層間絶縁膜をさらに備え、
前記第2の配線の一部が、前記第1の配線の一部と前記層間絶縁膜を介して立体交差しており、
前記立体交差している部分において、前記層間絶縁膜の外側の領域から前記層間絶縁膜が設けられている領域に延ばされており、前記層間絶縁膜の外側の領域で前記第2の配線の下面に積層されており、前記層間絶縁膜が設けられている領域で、前記層間絶縁膜及び前記第2の配線の下方に位置している、第1の補助配線電極をさらに備える、弾性波装置。 - 前記第1の補助配線電極が、前記立体交差している部分において、前記第1の配線の一方側及び他方側の双方に設けられている、請求項1に記載の弾性波装置。
- 前記層間絶縁膜が、前記第1の配線の一方側及び他方側に位置している第1及び第2の側面を有し、前記第1の側面及び前記第2の側面が、上方にいくにつれて、前記層間絶縁膜の中央に位置するように傾斜している傾斜面とされており、前記層間絶縁膜の外側の領域において、前記第1の補助配線電極と前記第2の配線との界面が前記層間絶縁膜に近づくにつれて、上方にいくように傾斜しており、
前記層間絶縁膜の前記第1及び第2の側面の前記圧電基板の上面に対する傾斜角度が、前記第1の補助配線電極と前記第2の配線との前記界面の前記圧電基板の上面に対する傾斜角度よりも大きくされている、請求項1または2に記載の弾性波装置。 - 前記第1の補助配線電極の前記第2の配線が積層されている部分における表面粗さが、前記第1の補助配線電極の前記層間絶縁膜により被覆されている部分における表面粗さよりも大きい、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の補助配線電極の前記第2の配線と接触する部分が、Cuを含むAl合金層であり、CuAl2金属間化合物からなる凸部を有する、請求項4に記載の弾性波装置。
- 前記第1の配線が延びる方向に延ばされており、前記層間絶縁膜の外側の領域において前記第1の配線に積層されており、前記層間絶縁膜上に至っており、前記第2の配線とは隔てられている、第2の補助配線電極をさらに備える、請求項1~5のいずれか1項に記載の弾性波装置。
- 前記層間絶縁膜の前記第1,第2の側面の前記傾斜角度が、50°以下である、請求項3に記載の弾性波装置。
- 前記層間絶縁膜の前記第1,第2の側面が、傾斜角度が相対的に大きい下方側面部と、傾斜角度が相対的に小さい上方側面部とを有する、請求項3または7に記載の弾性波装置。
- 前記層間絶縁膜が、第1の無機誘電体材料からなる第1の誘電体材料層と、前記第1の誘電体材料層上に積層された第2の誘電体材料層とを有する、請求項1~8のいずれか1項に記載の弾性波装置。
- 前記層間絶縁膜が第1の無機誘電体材料からなる第1の誘電体材料層と、前記第1の無機誘電体材料と異なる第2の無機誘電体材料からなる第2の誘電体材料層とを有し、前記第1の誘電体材料層の側面が前記下方側面部を構成しており、前記第2の誘電体材料層の側面が前記上方側面部を構成している、請求項8に記載の弾性波装置。
- 前記圧電基板上に設けられており、前記IDT電極が臨む中空部を形成するために前記IDT電極を囲むように設けられた支持部材と、
前記中空部を封止するために前記支持部材上に設けられた蓋材とをさらに備える、請求項1~10のいずれか1項に記載の弾性波装置。 - 前記支持部材が少なくとも1つの前記立体交差している部分上に至るように設けられている、請求項11に記載の弾性波装置。
- 請求項1~12のいずれか1項に記載の弾性波装置の製造方法であって、
前記圧電基板上に、前記IDT電極を形成する工程と、
前記圧電基板上に前記第1の補助配線電極を形成する工程と、
前記圧電基板上において、前記第1の配線の一部及び前記第1の補助配線電極の一部を覆うように前記層間絶縁膜を形成する工程と、
前記層間絶縁膜において前記第1の配線と交差する方向に延びるように、前記圧電基板上に前記第2の配線を形成する工程とを備える、弾性波装置の製造方法。 - 前記第1の補助配線電極の形成を、フォトリソグラフィー-エッチング法により行なう、請求項13に記載の弾性波装置の製造方法。
- 前記層間絶縁膜の形成を前記層間絶縁膜のドライエッチングにより行なう、請求項14に記載の弾性波装置の製造方法。
- 前記層間絶縁膜が、第1の無機誘電体材料からなる第1の無機誘電体材料層と、前記第1の無機誘電体材料とは異なる第2の無機誘電体材料からなる第2の無機誘電体材料層とを有し、前記第1の無機誘電体材料層及び前記第2の無機誘電体材料層をエッチング法により形成するにあたり、前記第1の無機誘電体材料層のエッチング速度を、前記第2の無機誘電体材料層のエッチング速度よりも高くする、請求項15に記載の弾性波装置の製造方法。
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JP2023046526A (ja) * | 2021-09-24 | 2023-04-05 | 三安ジャパンテクノロジー株式会社 | 弾性波デバイス、モジュール |
JP7364196B2 (ja) | 2021-09-24 | 2023-10-18 | 三安ジャパンテクノロジー株式会社 | 弾性波デバイス、モジュール |
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US20170155372A1 (en) | 2017-06-01 |
KR101907453B1 (ko) | 2018-10-12 |
US10601394B2 (en) | 2020-03-24 |
DE112015004763T5 (de) | 2017-09-07 |
JP6361738B2 (ja) | 2018-07-25 |
KR20170046764A (ko) | 2017-05-02 |
DE112015004763B4 (de) | 2022-08-25 |
CN106575958A (zh) | 2017-04-19 |
CN106575958B (zh) | 2019-05-03 |
JPWO2016063738A1 (ja) | 2017-04-27 |
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