WO2005002049A1 - 弾性表面波素子 - Google Patents
弾性表面波素子 Download PDFInfo
- Publication number
- WO2005002049A1 WO2005002049A1 PCT/JP2004/005552 JP2004005552W WO2005002049A1 WO 2005002049 A1 WO2005002049 A1 WO 2005002049A1 JP 2004005552 W JP2004005552 W JP 2004005552W WO 2005002049 A1 WO2005002049 A1 WO 2005002049A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acoustic wave
- surface acoustic
- piezoelectric substrate
- protective film
- wave device
- Prior art date
Links
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
- H03H9/05—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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02984—Protection measures against damaging
-
- 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
- H03H9/058—Holders; Supports for surface acoustic wave devices
- H03H9/0585—Holders; Supports for surface acoustic wave devices consisting of an adhesive layer
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/058—Holders; Supports for surface acoustic wave devices
- H03H9/059—Holders; Supports for surface acoustic wave devices consisting of mounting pads or bumps
-
- 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
- H03H9/1085—Mounting in enclosures for surface acoustic wave [SAW] devices the enclosure being defined by a non-uniform sealing mass covering the non-active sides of the BAW device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/32225—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73201—Location after the connecting process on the same surface
- H01L2224/73203—Bump and layer connectors
- H01L2224/73204—Bump and layer connectors the bump connector being embedded into the layer connector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/151—Die mounting substrate
- H01L2924/1517—Multilayer substrate
- H01L2924/15172—Fan-out arrangement of the internal vias
- H01L2924/15174—Fan-out arrangement of the internal vias in different layers of the multilayer substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
Definitions
- the present invention relates to a surface acoustic wave element used for a surface acoustic wave filter or the like, and more particularly, to a surface acoustic wave element having a structure in which electrode breakdown or the like due to pyroelectricity of a piezoelectric substrate is suppressed.
- a surface acoustic wave element used for a surface acoustic wave filter or the like, and more particularly, to a surface acoustic wave element having a structure in which electrode breakdown or the like due to pyroelectricity of a piezoelectric substrate is suppressed.
- an interdigital transducer In a surface acoustic wave device, an interdigital transducer (IDT) is generated by (a) electric charge generated on the surface due to pyroelectricity of a piezoelectric substrate due to temperature change, or (b) electric charge induced when a surge voltage is applied.
- IDT interdigital transducer
- discharge occurred between electrodes connected to different potentials. If the discharge is large, the electrode may deteriorate or rupture. As a result, the characteristics of the surface acoustic wave element are impaired.
- the resistivity of the piezoelectric substrate may be reduced.
- the resistivity of the substrate is lowered, suddenly generated charges on the substrate surface move on the substrate surface, and the potential difference is quickly reduced. Therefore, a discharge phenomenon caused by local accumulation of electric charges can be suppressed, and accordingly, a device such as a surface acoustic wave filter using a piezoelectric substrate can have improved pyroelectric breakdown resistance and power resistance.
- methods for lowering the resistivity of a substrate include doping the substrate surface with a substance that can become a carrier such as Fe, or heat-treating the substrate in a reducing atmosphere using a specific gas under reduced pressure. It has been known. For example, Japanese Unexamined 1 1 one 9 2 1 4 7 JP below, L i N b 0 3 or L i T a 0 3 crystals and the ability to reduce the surface charge is conditioned to increase An adjustment method is disclosed. In Japanese Patent Application Laid-Open No. H11-92147, more specifically, LiNbOs or Li is used under reduced pressure at a temperature of 500 to 114 ° C in a reducing atmosphere. T a 0 3 how the heat treatment crystal is shown.
- a treatment is performed in a high-temperature atmosphere containing oxygen.
- a surface acoustic wave device of a chip size package in which a surface acoustic wave element is flip-chip bonded to a mounting substrate and the surface acoustic wave element is sealed with resin, the surface acoustic wave element is mounted on the mounting substrate.
- a process is performed in a high-temperature atmosphere containing oxygen.
- a method of manufacturing a surface acoustic wave device in which a surface acoustic wave element is flip-chip bonded to a ceramic package the step of flip-chip bonding the surface acoustic wave element to the ceramic package is performed in a high-temperature atmosphere containing oxygen.
- a thermosetting step of the die pond agent after the die pond is performed in a high-temperature atmosphere containing oxygen.
- An object of the present invention is to solve the above-described disadvantages of the prior art, and to provide a surface acoustic wave device configured using a piezoelectric substrate having a reduced resistivity, in which the recovery of pyroelectricity hardly occurs. Accordingly, it is an object of the present invention to provide a surface acoustic wave device which is less likely to cause electrode deterioration and electrode destruction and has excellent reliability.
- the first invention of the present application is a resistivity of 1. 0x 1 0 7 ⁇ 1. 0xl 0i3Q.
- a piezoelectric substrate is cm, and is formed on one main surface of the piezoelectric substrate, and the inter one digital electrode, said And a protective film formed so as to cover the interdigital electrode.
- the second invention provides a piezoelectric substrate having a resistivity of 1-0 ⁇ 10 7 to 1.0 ⁇ 10 13 ⁇ cm, an interdigital electrode formed on one main surface of the piezoelectric substrate, and the interdigital electrode. And a protective film provided on an underlayer.
- a second protective film provided so as to cover the interdigital electrode is further provided.
- the protective film is configured by S i N, 1 kind selected from the group consisting of Z n O, and S i 0 2.
- the protective film is a SiN film Or a Z ⁇ ⁇ film and a SiO 2 film formed on the Si N film or the Z ⁇ ⁇ film.
- the piezoelectric substrate is made of L i T A_ ⁇ 3 or L i N b 0 3.
- the surface acoustic wave device is provided on the piezoelectric substrate and electrically connected to the outside! :
- An electrode pad is further provided, and the protective film is formed on substantially the entirety of the one main surface of the piezoelectric substrate so as to have an exposed portion having a smaller area than the electrode pad on the electrode pad.
- FIGS. 1A and 1B are schematic front sectional views of a surface acoustic wave device according to a first embodiment of the present invention, and electrodes of a surface acoustic wave element used in the surface acoustic wave device. It is a schematic plan view which shows a structure.
- FIG. 2 is a diagram showing the value of the voltage induced on the surface after heating a piezoelectric substrate having a low resistivity at various temperatures in the air and a nitrogen atmosphere for one hour.
- 3A is a schematic front sectional view of a surface acoustic wave device according to a second embodiment of the present invention
- FIG. 3B is a bottom view of a surface acoustic wave element used.
- FIG. 4 is a schematic front sectional view of a surface acoustic wave device according to a third embodiment of the present invention.
- FIG. 5 is a schematic front sectional view of a surface acoustic wave device according to a fourth embodiment of the present invention.
- FIG. 6 is a schematic front sectional view of a surface acoustic wave device according to a fifth embodiment of the present invention.
- FIG. 7 is a schematic front sectional view of a surface acoustic wave device according to a sixth embodiment of the present invention.
- FIG. 8 is a schematic front sectional view of a surface acoustic wave device according to a seventh embodiment of the present invention.
- FIG. 9 is a schematic front sectional view showing a modification of the surface acoustic wave device according to the third embodiment of the present invention.
- FIG. 10 is a schematic front sectional view showing a modification of the surface acoustic wave device according to the fifth embodiment of the present invention.
- FIGS. 1A and 1B are a schematic front sectional view of a surface acoustic wave device according to a first embodiment of the present invention and an electrode structure of a surface acoustic wave device used in the present invention.
- FIG. 2 is a schematic plan view for performing
- the surface acoustic wave element 3 is mounted on the mounting board 2 by force-down bonding.
- the periphery of the surface acoustic wave element 3 is covered with the sealing resin 4.
- the surface acoustic wave element 3 has a piezoelectric substrate 5. As shown in FIG. 1A, an interdigital electrode 6 and electrode pads 7 and 8 are formed on one main surface 5 a of the piezoelectric substrate 5. The electrode pads 7 and 8 are electrically connected to the interdigital electrodes 6a and 6b of the interdigital electrode 6, respectively. In FIG. 1A, only the interdigital electrode 6 and the electrode pads 7 and 8 are shown for easy understanding of the configuration of the present invention, but in the present embodiment, specifically, FIG. The electrode structure shown in 1 (b) is provided. That is, as shown in FIG.
- a one-port SAW resonator R and a longitudinally coupled resonator type surface acoustic wave filter F having a balance-unbalance conversion function are formed on the piezoelectric substrate 5.
- the 1-port S AW resonator R is It has an interdigital electrode 6a and a pair of reflectors arranged on both sides of the interdigital electrode 6a.
- the longitudinally coupled resonator type surface acoustic wave filter F is disposed on the side of the region where the three interdigital electrodes 6 b to 6 d and the interdigital electrodes 6 b to 6 d are provided. It has a pair of reflectors.
- the protective film 9 forms a surface acoustic wave resonator R including the interdigital electrodes 6a and 6b to 6d and a longitudinally coupled resonator type surface acoustic wave filter F.
- the various electrodes described above are covered.
- the piezoelectric substrate 5 is constituted by a piezoelectric single crystal substrate, such as L i T a 0 3 or L i N b 0 3 which has been subjected to special treatment. Therefore, the piezoelectric substrate 5 has a resistivity in the thickness direction of 1.0 O 10 to 10 ⁇ 10 13 ⁇ ⁇ cm. When the resistivity exceeds 1.0 ⁇ 10 13 Q ⁇ cm, the piezoelectric substrate has pyroelectricity, and the interdigital electrode is likely to deteriorate or break when subjected to a temperature change or the like. 1. If it is less than 0 X 1 0 7 ⁇ ⁇ cm is lower piezoelectric properties of the piezoelectric substrate, it becomes impossible to obtain sufficient characteristics as a surface acoustic wave device.
- Such a resistivity is realized by subjecting the piezoelectric single crystal substrate to an oxygen reduction treatment.
- the piezoelectric substrate 5 having a resistivity of 1.0 X 1013 Q ⁇ cm or less has almost no pyroelectricity.
- the interdigital electrode 6 and the electrode pads 7, 8 are made of, for example, a metal or alloy such as Cu or A1.
- the surface acoustic wave element 3 is mounted on the mounting substrate 2 such that the main surface 5a is the lower surface.
- the electrode pads 11 and 12 are formed on the upper surface 2 a of the mounting board 2. Electrode pads 7 and 8 of surface acoustic wave element 3 are joined to electrode pads 11 and 12 by metal bumps 13 and 14. As the metal bumps 13 and 14, bumps made of an appropriate metal material such as gold or solder can be used. ′
- the connection electrodes 15 and 16 are formed in the mounting board 2. The upper ends of the connection electrodes 15 and 16 reach the upper surface 2a of the mounting board, and are electrically connected to the electrode pads 11 and 12.
- connection electrodes 15 and 16 reach the lower surface 2b of the mounting board 2, and are electrically connected to the terminal electrodes 17 and 18 formed on the lower surface 2b.
- the electrode pads 11 and 12, the connection electrodes 15 and 16, and the terminal electrodes 17 and 18 provided on the mounting board 2 are made of an appropriate metal material such as A 1 or Cu.
- the mounting substrate 2 can be made of an insulating ceramic such as alumina, an insulating resin, or the like.
- the surface acoustic wave element 3 is mounted on the mounting board 2, and the gap A is formed between the surface acoustic wave element 3 and the mounting board 2. Therefore, the vibration of the surface acoustic wave element 3 is not hindered, and the characteristic hardly deteriorates. Further, a sealing resin 4 is provided to seal the gap A. The sealing resin 4 is in contact with the top and side surfaces of the surface acoustic wave element 3 and is joined to the top surface 2 a of the mounting board 2.
- the surface acoustic wave device 1 is characterized in that a protective film 9 is formed on the surface acoustic wave device 3.
- the protective film 9 serves as a piezoelectric substrate during the high-temperature treatment including oxygen during the manufacturing process of the surface acoustic wave device 1. It is provided to prevent the pyroelectricity of 5 from being restored.
- the material constituting the protective film 9 is not particularly limited, as a material constituting the protective film 9, for example, S i N, Z n O , etc. S i 0 2 and the like, Preferably, SiN containing no oxygen is suitably used. 'However, in the case of forming a protective film made of S i 0 2 and Z eta theta can be suppressed even reoxidation of the piezoelectric substrate 5 by the protective film 9.
- the protective film 9 is formed so as to cover a region where the interdigital electrode 6 is formed in the present embodiment. Therefore, the surface of the piezoelectric substrate 5 is not directly in contact with the atmosphere in the region where the interdigital electrodes 6 are formed. Therefore, reoxidation of the piezoelectric substrate 5 in the region is suppressed.
- the treatment at a high temperature containing oxygen that causes re-oxidation is a step of bonding the surface acoustic wave element 3 to the mounting board 2 by the face-down method after obtaining the surface acoustic wave element 3. , And a step of thermosetting the sealing resin 4.
- the treatment is performed at a high temperature containing oxygen.
- the formation of the protective film 9 prevents the region of the piezoelectric substrate 5 covered with the protective film 9 from being reoxidized. Therefore, electrode deterioration and electrode breakage due to the pyroelectric effect of the surface acoustic wave device 1 and application of a surge voltage are unlikely to occur. This will be described based on specific experimental examples.
- the piezoelectric substrate obtained as described above and the piezoelectric substrate on which the protective film was formed were heated at various temperatures in the air for one hour, and after a sufficient time had elapsed, each substrate was heated to 10 ° C by a heater. The voltage induced on the surface when heated to ° c was measured. In addition, the same piezoelectric substrate is similarly heated for 1 hour at various temperatures in a nitrogen atmosphere. The voltage induced on the surface when each of the substrates was heated to 10 ° C. by a heater was measured.
- ⁇ is a L i T a 0 3 substrate resistivity is 1 0 ⁇ 4 ⁇ when heated to 1 0 0 ° C by a heater, showing the voltage induced on the surface.
- FIG. 9 when the surface acoustic wave element is formed using a piezoelectric substrate having a reduced resistivity, if the protective film 9 is formed according to the present embodiment, even if the protective film 9 is exposed to a high temperature including oxygen, FIG. It can be seen that the re-oxidation of the piezoelectric substrate 5 is suppressed as in the case of heating in the nitrogen atmosphere of No. 2. Therefore, in the surface acoustic wave device 1 of the above-described embodiment, the protective film 9 is formed so that even if a process under a high temperature including oxygen is performed in the manufacturing process of the surface acoustic wave device 1, the protective film of the piezoelectric substrate 5 is formed. Reoxidation of the surface hardly occurs in the area covered by 9. In other words, the pyroelectricity is not restored, so that the deterioration and rupture of the electrode can be surely suppressed.
- the protective film 9 not only can suppress the above-described resurrection of the pyroelectricity, but also has a function of preventing the oxidation and corrosion of the IDT electrode 6.
- the protective film 9 is formed on the IDT electrode, the adhesion of the metal powder itself between the electrode fingers can be suppressed, that is, the short circuit due to the metal powder in the IDT electrode finger 6 can be prevented. Since the defects can be suppressed, the above steps are not required.
- FIG. 3A is a schematic front sectional view of a surface acoustic wave device according to a second embodiment of the present invention.
- the protective film 9 is formed on one main surface 5a of the piezoelectric substrate 4 in a region where the interdigital electrode 6 is formed.
- the protective film 29 is provided not only in the region where the interdigital electrode 6 is provided but also in the piezoelectric substrate 5
- the main surface 5a is formed so as to cover almost the entire surface.
- at least a part of the upper surface of the electrode pads 7 and 8 is exposed and covered with a protective film 29.
- the surface acoustic wave device 21 is configured similarly to the surface acoustic wave device 1. Therefore, the same parts are denoted by the same reference numerals, and their description is omitted. .
- the protective film 29 is formed so as to cover almost the entire area of the main surface 5 a of the piezoelectric substrate 5, the reoxidation of the piezoelectric substrate 5 can be more efficiently performed. It can be effectively suppressed and the protective film 29
- the effect of preventing short-circuiting and corrosion of the electrodes is also enhanced.
- the protective film 29 for example, after forming a protective film on the entire surface on the main surface 5a of the piezoelectric substrate 5, electrode pads 7, 8, E1, E2, E3 are provided. A method of etching the protective film only in the portion where the protection film is formed. In this case, as shown in the plan view of the surface acoustic wave element 3 in FIG. 3 (b), the etching area, that is, the area of the exposed portion 29a is determined by the electrode pads 7, 8, E1, E2, It is desirable that the area be smaller than the area of E 3.
- the outer edge of the exposed portion 29a formed by etching is located inside the outer edge of the electrode pads 7, 8, E1, E2, and E3. It is desirable not to expose the main surface 5a.
- the intermetallic compound between the metal bumps 13 and 14 and the electrode pads 7 and 8, which is formed after the formation of the metal bumps 13 and 14, is prevented from spreading to the entire area of the electrode pads 7 and 8. The effect is also obtained. That is, since the region where the intermetallic compound is formed can be suppressed, it is possible to suppress the generation of metal powder caused by the deterioration and dropping of the outer edge of the electrode pad due to the effect of the intermetallic compound.
- FIG. 4 is a schematic front sectional view of a surface acoustic wave device according to a third embodiment of the present invention.
- the protective film 39 is formed directly on the main surface 5 a of the piezoelectric substrate 5 as a base of the interdigital electrode 6. That is, the surface acoustic wave device 31 is configured in the same manner as the surface acoustic wave device 1 except that the protective film 39 is configured as a base of the interdigital electrode 6.
- the protective film 39 is formed as a base layer of the interdigital electrode 6, but also in this case, as in the first embodiment, in the manufacturing process of the elastic surface wave device 1, Even when exposed to a high-temperature atmosphere containing oxygen, the re-oxidation of the piezoelectric substrate 5 is prevented in the region where the protective film 39 is provided. Therefore, as in the first embodiment, Deterioration or destruction of the electrode 6 due to the pyroelectric effect is unlikely to occur.
- the protection film 39 can enhance the stabilization of the electrical characteristics.
- a protective film 39 is formed as a base layer in a region where the interdigital electrode 6 is provided.
- the protective film 39 is formed on the main surface 5 of the piezoelectric substrate 5. Even if it is formed on the entire surface of a. In this case, since the protective film 39 is formed as a base for the electrode pads 7 and 8, unlike the second embodiment, the protective film 39 must be formed over the entire area of the main surface 5a. Can be. Further, by forming the protective film 39 on the entire area of the main surface 5a, reoxidation of the piezoelectric substrate 5 can be more effectively suppressed.
- FIG. 5 is a schematic front sectional view of a surface acoustic wave device according to a fourth embodiment of the present invention.
- the protective film 49 has a laminated structure.
- the surface acoustic wave device 41 has the same configuration as the surface acoustic wave device 1.
- the protective film 49 includes a first layer 49 a formed to cover the region where the interdigital electrode 6 is formed, and a second layer 49 b formed on the first layer 49 a.
- the protective film may have a laminated structure in which a plurality of protective film constituent materials are laminated.
- the first layer 4 9 a is made S i N or Z eta theta film
- the second layer 4 9 b is formed from the S i 0 2 film.
- the SiN film has excellent oxidation resistance and corrosion resistance even when it is thin.
- S i 0 2 film is excellent in stability in long-term compared to S i N film. Therefore, by forming the SiO 2 film as the second layer 49 b on the 3 1 ⁇ film ⁇ ⁇ ⁇ film,
- the frequency can be easily adjusted by the thickness of the protective film. That is, the frequency of the surface acoustic wave element 3 can be adjusted by adjusting the thickness of the protective film.
- a protective film material constituting the second layer 49b a wide range of etching conditions can be selected. It is desirable to use a material whose film thickness can be easily adjusted. For example, the Sio 2 film has a wider selection range of the etching conditions than the SiN film, and the film thickness can be easily adjusted. Therefore, it is desirable that the second layer 49 b be a SiO 2 film.
- the protective film 49 is provided only in the region where the interdigital electrode 6 is formed. However, similar to the surface acoustic wave device 21 of the second embodiment, the protective film 49 is provided. May be formed so as to reach almost the entire area of the main surface 5 a of the piezoelectric substrate 5. In this case, at least one of the first layer 49a and the second layer 49b may be formed so as to reach almost the entire region.
- FIG. 6 is a schematic front sectional view showing a surface acoustic wave device according to a fifth embodiment of the present invention.
- the interdigital electrode 6 is formed on the protective film 39, similarly to the surface acoustic wave device 31 of the third embodiment.
- a second protective film 59 is formed so as to cover the interdigital electrode 6.
- the interdigital electrode 6 is formed in a laminated structure of the protective film 39 and the protective film 59.
- the surface acoustic wave device 51 is configured similarly to the surface acoustic wave device 31.
- the interdigital electrode 6 may be embedded in a protective film having a multilayer structure. Even in this case, even if the substrate is exposed to a high-temperature treatment containing oxygen in a later step, the protective film 39, 59 prevents Thus, reoxidation of the surface of the piezoelectric substrate 5 is suppressed. In addition, by forming the protective film 59, oxidation and corrosion of the interdigital electrode 6 can be suppressed. In this embodiment, at least one of the protective films 39 and 59 may be formed so as to reach almost the entire area of the main surface 5a of the piezoelectric substrate 5.
- the protective films 39 and 59 are formed in the region excluding the electrical connection portion. It needs to be formed.
- the protective film 39 may be formed as a base layer for the electrode pads 7 and 8 as shown in FIG. 10, in which case the protective film 39 extends over the entire main surface 5a. May be formed.
- FIG. 7 is a schematic front sectional view of a surface acoustic wave device according to a sixth embodiment of the present invention.
- the surface acoustic wave element 3 is configured similarly to the surface acoustic wave element 3 of the surface acoustic wave device 1 of the first embodiment.
- the structure of the package is different from that of the first surface acoustic wave device 1. That is, in the surface acoustic wave device 61, a package material 62 having a concave portion 62a opened on the upper surface is used.
- the surface acoustic wave element 3 is housed in the recess 62 a of the package material 62.
- the electrode pads 11 and 12 are formed on the bottom surface 6 2 b of the concave portion 6 2 a of the package material 62.
- the connection electrodes 15 and 16 and the terminal electrodes 17 and 18 are provided on the package material 62.
- the lid member 63 is joined to the package member 62 with an insulating adhesive or the like so as to cover the concave portion 62 a of the package 62.
- the package material 62 can be made of insulating ceramics, synthetic resin, or the like, similarly to the mounting substrate 2.
- the lid member 63 can be made of a metal or an insulating material. When the lid member 63 is made of metal, the upper part of the concave portion 62 a can be electromagnetically shielded.
- the protective film 9 due to the presence of the protective film 9,
- the piezoelectric substrate 5 is not reoxidized in the step of bonding.
- FIG. 8 is a schematic front sectional view showing a surface acoustic wave device according to a seventh embodiment.
- the surface acoustic wave element 3 is housed in the recess 72 a of the package 72.
- the surface acoustic wave element 3 is fixed to the package material 72 by the insulating adhesive 73 from the main surface 5b side of the piezoelectric substrate 5 instead of the face down method.
- the surface acoustic wave element 3 is housed and fixed in the recess 72 a so that the main surface 5 a of the surface acoustic wave element 3 on which the interdigital electrodes 6 and the like are formed becomes the upper surface. I have.
- a step 72c is formed in the recess 72a of the package material 72, and the electrode pads 74 and 75 are formed on the step 72c.
- the electrode pads 74 and 75 are joined to the electrode pads 7 and 8 of the surface acoustic wave element 3 by bonding wires 76 and 77, respectively.
- connection electrodes 80, 81 for connecting the electrode pads 74, 75 to the terminal electrodes 78, 79 provided on the lower surface of the package 72 are formed on the package 72.
- the lid member 82 is fixed to the package member 72 so as to close the recess 72 a.
- the lid member 82 can be made of the same material as the lid member 63 of the surface acoustic wave device 61. Due to the presence of the protective film 9, the piezoelectric substrate 5 is not reoxidized even in the step of die bonding with an insulating adhesive.
- the surface acoustic wave device of the present invention can be used to configure surface acoustic wave devices having various package structures, and the package structure is not particularly limited. Not something.
- the surface acoustic wave element of the present invention is not limited to the one having the electrode structure shown in FIG. 1 (b), but has an appropriate electrode structure that constitutes various surface acoustic wave resonators and surface acoustic wave filters. Applying the present invention to a surface acoustic wave element
- the surface acoustic wave device is configured using a low-resistance piezoelectric substrate having a resistivity of 1.0 ⁇ 10 7 -1.0 X 10 ⁇ 3 ⁇ ⁇ cm. Does not have electrical properties.
- the protective film since the protective film is formed so as to cover at least the interdigital electrode, the protective film can be used in a process of manufacturing a surface acoustic wave device using a surface acoustic wave element in an atmosphere containing oxygen. Even if the treatment is performed at a high temperature, re-oxidation of the piezoelectric substrate hardly occurs. Therefore, even if the piezoelectric substrate is exposed to a high temperature containing oxygen, re-oxidation of the piezoelectric substrate hardly occurs, so that deterioration and destruction of the interdigital electrode can be effectively suppressed.
- interdigital electrodes are covered with the protective film, oxidation and corrosion of the interdigital electrodes are unlikely to occur.
- the surface acoustic wave element is formed by using a low-resistance piezoelectric substrate having a resistivity of 1.0 ⁇ 10 7 to 1.0 ⁇ 10 13 ⁇ ⁇ cm. Since the protective film is provided on the underlayer, the reoxidation of the piezoelectric substrate is suppressed by the protective film. Therefore, even in the second invention, even if the piezoelectric substrate is exposed to a high temperature in an atmosphere containing oxygen, re-oxidation of the piezoelectric substrate is unlikely to occur, so that deterioration and breakage of electrodes due to pyroelectricity of the piezoelectric substrate occur. hard.
- the second protective film when the second protective film is provided so as to cover the interdigital electrode, the second protective film also suppresses re-oxidation of the piezoelectric substrate, and also suppresses the interdigital electrode. Since this is protected by the second protective film, the oxidation resistance and corrosion resistance of the interdigital electrode can be improved as in the first invention.
- the protective layer may be composed of a variety of materials but, S i N, Z n O, and if it is composed of one kind selected from the group consisting of S io 2, effectively re-oxidation of the piezoelectric board Can be suppressed.
- the protective layer may have a layered structure, if having an S i_ N film or Z n O film and, S i N film or Z eta theta S formed on the membrane ⁇ 0 2 film.
- S i 0 2 film compared to S i N film and Z eta theta film, wide selection range of the etching conditions, since it is easy to thickness adjustment, the second layer of S I_ ⁇ 2 film By forming it as a protective film, frequency adjustment can be performed easily and with high accuracy. .
- the piezoelectric substrate is made of L i T a 0 3 substrate or L i N B_ ⁇ 3 substrate, as described above, by Rukoto to high-temperature treatment in a reduced pressure atmosphere, resistivity 1.0 It is possible to easily obtain a piezoelectric substrate of x107 to ⁇ 0.010 ⁇ 10 cm.
- An electrode pad is provided on the piezoelectric substrate, and the protective film is formed on substantially the entirety of one main surface of the piezoelectric substrate so as to have an exposed portion having a smaller area than the electrode pad on the electrode pad.
- the protection film prevents exposure on the main surface of the piezoelectric substrate. Therefore, the reoxidation of the piezoelectric substrate can be more reliably prevented.
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/543,808 US7282835B2 (en) | 2003-06-26 | 2004-04-19 | Surface acoustic wave element |
JP2005510982A JP4341622B2 (ja) | 2003-06-26 | 2004-04-19 | 弾性表面波装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003183094 | 2003-06-26 | ||
JP2003-183094 | 2003-06-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005002049A1 true WO2005002049A1 (ja) | 2005-01-06 |
Family
ID=33549571
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/005552 WO2005002049A1 (ja) | 2003-06-26 | 2004-04-19 | 弾性表面波素子 |
Country Status (3)
Country | Link |
---|---|
US (1) | US7282835B2 (ja) |
JP (1) | JP4341622B2 (ja) |
WO (1) | WO2005002049A1 (ja) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006217225A (ja) * | 2005-02-03 | 2006-08-17 | Matsushita Electric Ind Co Ltd | 弾性表面波デバイスの製造方法 |
JP2006352377A (ja) * | 2005-06-14 | 2006-12-28 | Epson Toyocom Corp | 弾性表面波デバイスとその製造方法 |
US7525240B2 (en) | 2004-04-26 | 2009-04-28 | Tdk Corporation | Electronic component |
JP2010098385A (ja) * | 2008-10-14 | 2010-04-30 | Murata Mfg Co Ltd | 弾性波装置 |
WO2011138877A1 (ja) * | 2010-05-07 | 2011-11-10 | 株式会社村田製作所 | 弾性表面波装置及びその製造方法 |
JP5158092B2 (ja) * | 2007-11-28 | 2013-03-06 | 株式会社村田製作所 | 弾性波装置 |
WO2015022931A1 (ja) * | 2013-08-14 | 2015-02-19 | 株式会社村田製作所 | 弾性波装置、電子部品、および弾性波装置の製造方法 |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1765050A (zh) * | 2004-03-18 | 2006-04-26 | 株式会社村田制作所 | 声表面波器件 |
WO2006087871A1 (ja) * | 2005-02-15 | 2006-08-24 | Murata Manufacturing Co., Ltd. | 積層型圧電素子 |
CN101107776B (zh) * | 2005-06-16 | 2010-05-19 | 株式会社村田制作所 | 压电器件及其制作方法 |
WO2007026428A1 (ja) * | 2005-08-31 | 2007-03-08 | Kyocera Corporation | 圧電共振子 |
US7888850B2 (en) * | 2007-01-30 | 2011-02-15 | Nihon Dempa Kogyo Co., Ltd. | Tuning-fork type piezoelectric unit |
US20090216551A1 (en) * | 2008-02-26 | 2009-08-27 | Project Omega, Inc. | Method and system for managing social networks of a user |
JP4836092B2 (ja) * | 2008-03-19 | 2011-12-14 | 国立大学法人東北大学 | 半導体装置の形成方法 |
US8508100B2 (en) * | 2008-11-04 | 2013-08-13 | Samsung Electronics Co., Ltd. | Surface acoustic wave element, surface acoustic wave device and methods for manufacturing the same |
JP5120461B2 (ja) * | 2008-11-18 | 2013-01-16 | 株式会社村田製作所 | チューナブルフィルタ |
CN205725680U (zh) * | 2013-12-26 | 2016-11-23 | 株式会社村田制作所 | 弹性波装置 |
US9973169B2 (en) * | 2015-10-01 | 2018-05-15 | Qorvo Us, Inc. | Surface acoustic wave filter with a cap layer for improved reliability |
CN111781271B (zh) * | 2020-07-14 | 2022-03-08 | 电子科技大学 | 一种柔性声表面波气体传感器及其制备方法 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06132758A (ja) * | 1992-10-14 | 1994-05-13 | Murata Mfg Co Ltd | 弾性表面波装置の製造方法 |
JPH0826730A (ja) * | 1994-07-12 | 1996-01-30 | Nippon Mektron Ltd | ニオブ酸リチウム基板の製造方法 |
JPH08307190A (ja) * | 1994-05-13 | 1996-11-22 | Matsushita Electric Ind Co Ltd | 弾性表面波モジュール素子及びその製造方法 |
JP2000183680A (ja) * | 1998-12-11 | 2000-06-30 | Tdk Corp | 弾性表面波装置 |
JP2000517144A (ja) * | 1997-06-10 | 2000-12-19 | トムソン―セーエスエフ | 焦電妨害を除去する表面弾性波デバイス |
JP2001102898A (ja) * | 1999-09-30 | 2001-04-13 | Kyocera Corp | 弾性表面波装置 |
JP2001345657A (ja) * | 2000-05-31 | 2001-12-14 | Kyocera Corp | 弾性表面波装置およびその製造方法 |
JP2003023187A (ja) * | 2001-07-10 | 2003-01-24 | Murata Mfg Co Ltd | 高耐熱圧電素子およびそれを用いた圧電装置 |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4381469A (en) * | 1979-07-20 | 1983-04-26 | Murata Manufacturing Company, Ltd. | Temperature stable piezoelectric device |
JPH06152299A (ja) | 1992-11-09 | 1994-05-31 | Fujitsu Ltd | 弾性表面波デバイス |
JP2003264448A (ja) | 1994-05-13 | 2003-09-19 | Matsushita Electric Ind Co Ltd | 弾性表面波モジュール素子 |
WO1996004713A1 (fr) * | 1994-08-05 | 1996-02-15 | Japan Energy Corporation | Dispositif a ondes acoustiques de surface et procede de production |
JPH0897671A (ja) | 1994-09-27 | 1996-04-12 | Oki Electric Ind Co Ltd | 弾性表面波装置 |
JPH09199974A (ja) * | 1996-01-19 | 1997-07-31 | Nec Corp | 弾性表面波装置 |
JPH10107573A (ja) | 1996-09-30 | 1998-04-24 | Kyocera Corp | 弾性表面波装置 |
JPH10209801A (ja) | 1997-01-28 | 1998-08-07 | Murata Mfg Co Ltd | 表面波装置 |
EP0893515B1 (en) | 1997-07-25 | 2003-11-26 | Crystal Technology, Inc. | Preconditioned crystals of lithium niobate and lithium tantalate and methods of preparing the same |
JPH11274883A (ja) | 1998-03-20 | 1999-10-08 | Sumitomo Electric Ind Ltd | 圧電体複合基板および表面弾性波素子 |
JP2000058593A (ja) | 1998-08-03 | 2000-02-25 | Nec Corp | 表面弾性波素子の実装構造及びその実装方法 |
JP2001168676A (ja) | 1999-09-30 | 2001-06-22 | Matsushita Electric Ind Co Ltd | 弾性表面波デバイスおよびその製造方法 |
JP3435639B2 (ja) * | 2000-04-13 | 2003-08-11 | 株式会社村田製作所 | 弾性表面波装置の製造方法及び弾性表面波装置 |
JP3829644B2 (ja) | 2000-05-01 | 2006-10-04 | 株式会社村田製作所 | 表面波装置、横波トランスデューサー及び縦波トランスデューサーの製造方法 |
US6710682B2 (en) * | 2000-10-04 | 2004-03-23 | Matsushita Electric Industrial Co., Ltd. | Surface acoustic wave device, method for producing the same, and circuit module using the same |
US6969945B2 (en) * | 2001-02-06 | 2005-11-29 | Matsushita Electric Industrial Co., Ltd. | Surface acoustic wave device, method for manufacturing, and electronic circuit device |
JP4058970B2 (ja) | 2001-03-21 | 2008-03-12 | セイコーエプソン株式会社 | ニオブ酸カリウム圧電薄膜を有する表面弾性波素子、周波数フィルタ、発振器、電子回路、及び電子機器 |
JP3925366B2 (ja) * | 2001-10-17 | 2007-06-06 | 株式会社村田製作所 | 弾性表面波装置およびその製造方法 |
-
2004
- 2004-04-19 US US10/543,808 patent/US7282835B2/en active Active
- 2004-04-19 WO PCT/JP2004/005552 patent/WO2005002049A1/ja active Application Filing
- 2004-04-19 JP JP2005510982A patent/JP4341622B2/ja not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06132758A (ja) * | 1992-10-14 | 1994-05-13 | Murata Mfg Co Ltd | 弾性表面波装置の製造方法 |
JPH08307190A (ja) * | 1994-05-13 | 1996-11-22 | Matsushita Electric Ind Co Ltd | 弾性表面波モジュール素子及びその製造方法 |
JPH0826730A (ja) * | 1994-07-12 | 1996-01-30 | Nippon Mektron Ltd | ニオブ酸リチウム基板の製造方法 |
JP2000517144A (ja) * | 1997-06-10 | 2000-12-19 | トムソン―セーエスエフ | 焦電妨害を除去する表面弾性波デバイス |
JP2000183680A (ja) * | 1998-12-11 | 2000-06-30 | Tdk Corp | 弾性表面波装置 |
JP2001102898A (ja) * | 1999-09-30 | 2001-04-13 | Kyocera Corp | 弾性表面波装置 |
JP2001345657A (ja) * | 2000-05-31 | 2001-12-14 | Kyocera Corp | 弾性表面波装置およびその製造方法 |
JP2003023187A (ja) * | 2001-07-10 | 2003-01-24 | Murata Mfg Co Ltd | 高耐熱圧電素子およびそれを用いた圧電装置 |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7525240B2 (en) | 2004-04-26 | 2009-04-28 | Tdk Corporation | Electronic component |
JP2006217225A (ja) * | 2005-02-03 | 2006-08-17 | Matsushita Electric Ind Co Ltd | 弾性表面波デバイスの製造方法 |
JP2006352377A (ja) * | 2005-06-14 | 2006-12-28 | Epson Toyocom Corp | 弾性表面波デバイスとその製造方法 |
JP5158092B2 (ja) * | 2007-11-28 | 2013-03-06 | 株式会社村田製作所 | 弾性波装置 |
JP2010098385A (ja) * | 2008-10-14 | 2010-04-30 | Murata Mfg Co Ltd | 弾性波装置 |
WO2011138877A1 (ja) * | 2010-05-07 | 2011-11-10 | 株式会社村田製作所 | 弾性表面波装置及びその製造方法 |
CN102870326A (zh) * | 2010-05-07 | 2013-01-09 | 株式会社村田制作所 | 弹性表面波装置以及其制造方法 |
WO2015022931A1 (ja) * | 2013-08-14 | 2015-02-19 | 株式会社村田製作所 | 弾性波装置、電子部品、および弾性波装置の製造方法 |
JPWO2015022931A1 (ja) * | 2013-08-14 | 2017-03-02 | 株式会社村田製作所 | 弾性波装置、電子部品、および弾性波装置の製造方法 |
US10250220B2 (en) | 2013-08-14 | 2019-04-02 | Murata Manufacturing Co., Ltd. | Elastic wave device, electronic component, and method for manufacturing elastic wave device |
Also Published As
Publication number | Publication date |
---|---|
JP4341622B2 (ja) | 2009-10-07 |
US7282835B2 (en) | 2007-10-16 |
US20060131991A1 (en) | 2006-06-22 |
JPWO2005002049A1 (ja) | 2006-08-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4341622B2 (ja) | 弾性表面波装置 | |
US6552475B2 (en) | Surface acoustic wave device | |
EP2175556B1 (en) | Elastic wave device and method for manufacturing the same | |
JP2012034418A (ja) | 弾性表面波素子及び弾性表面波装置 | |
US10250220B2 (en) | Elastic wave device, electronic component, and method for manufacturing elastic wave device | |
US11616486B2 (en) | Acoustic wave device and electronic component module | |
WO2005091500A1 (ja) | 弾性表面波装置 | |
JP4697528B2 (ja) | 弾性波装置 | |
JP2003198321A (ja) | 弾性表面波装置およびその製造方法 | |
EP1521362B1 (en) | Method of producing surface acoustic wave device and the surface acoustic wave device | |
JP2008079275A (ja) | 弾性表面波素子及び弾性表面波装置 | |
JP2007081555A (ja) | 弾性表面波装置 | |
JP2005223641A (ja) | 表面実装型sawデバイス | |
CN100508386C (zh) | 弹性波装置 | |
EP1635458B1 (en) | Surface acoustic wave device | |
JP2000114916A (ja) | 表面弾性波デバイス及びその製造方法 | |
JPWO2018216486A1 (ja) | 電子部品およびそれを備えるモジュール | |
JP2005020423A (ja) | 弾性表面波装置 | |
JP7281146B2 (ja) | 弾性波デバイス | |
JP2007096526A (ja) | 表面実装型弾性表面波デバイス | |
JP2007028235A (ja) | 弾性表面波装置 | |
JP2004235896A (ja) | 弾性表面波装置 | |
JP2001285013A (ja) | 弾性表面波装置 | |
JP2003338514A (ja) | 超音波接合構造及び方法、並びにそれを用いた電子部品及びその製造方法 | |
JP2004200908A (ja) | 弾性表面波装置の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2005510982 Country of ref document: JP |
|
ENP | Entry into the national phase |
Ref document number: 2006131991 Country of ref document: US Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10543808 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 10543808 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |