WO2004088840A1 - 圧電薄膜デバイス及びその製造方法 - Google Patents
圧電薄膜デバイス及びその製造方法 Download PDFInfo
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- WO2004088840A1 WO2004088840A1 PCT/JP2004/004507 JP2004004507W WO2004088840A1 WO 2004088840 A1 WO2004088840 A1 WO 2004088840A1 JP 2004004507 W JP2004004507 W JP 2004004507W WO 2004088840 A1 WO2004088840 A1 WO 2004088840A1
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- substrate
- piezoelectric thin
- via hole
- thin film
- piezoelectric
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- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- NKZSPGSOXYXWQA-UHFFFAOYSA-N dioxido(oxo)titanium;lead(2+) Chemical compound [Pb+2].[O-][Ti]([O-])=O NKZSPGSOXYXWQA-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
- H03H9/171—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type
- H03H9/172—Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
- H03H9/174—Membranes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/0504—Holders; Supports for bulk acoustic wave devices
- H03H9/0514—Holders; Supports for bulk acoustic wave devices consisting of mounting pads or bumps
- H03H9/0523—Holders; Supports for bulk acoustic wave devices consisting of mounting pads or bumps for flip-chip mounting
-
- 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
- H03H9/1007—Mounting in enclosures for bulk acoustic wave [BAW] devices
- H03H9/1014—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW 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
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/56—Monolithic crystal filters
- H03H9/564—Monolithic crystal filters implemented with thin-film techniques
-
- 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
- H03H9/56—Monolithic crystal filters
- H03H9/566—Electric coupling means therefor
- H03H9/568—Electric coupling means therefor consisting of a ladder configuration
Definitions
- the present invention relates to a piezoelectric thin-film device having a single or a combination of a plurality of piezoelectric thin-film resonators using a piezoelectric film and a method for manufacturing the same. More specifically, the present invention relates to a filter for a communication device. The present invention relates to a piezoelectric thin film device that can be used and a method for manufacturing the same. Background technology:
- SAW surface acoustic wave
- F BAR thin film bulk wave resonator
- S BAR is a thin support film provided on a substrate, on which a thin film mainly composed of a piezoelectric material and an electrode for driving the thin film are formed. Is possible. If the filter is composed of F BAR or S BAR, it can be remarkably miniaturized, low loss, wide band operation is possible, and it can be integrated with the semiconductor integrated circuit. Is expected.
- a piezoelectric thin film resonator such as a FB AR or S BAR applied to a resonator or a filter using such an elastic wave is manufactured as follows. Dielectric thin films are formed on the surface of a semiconductor single crystal substrate such as silicon, or a substrate formed by depositing a polycrystalline diamond or a permanent metal such as an ellipse on the surface of a silicon wafer. A base film composed of a conductor thin film or a laminated film of these is formed. A piezoelectric thin film is formed on the underlayer, and an upper structure is formed as necessary. After the formation of each film or after forming all the films, each film is subjected to a physical treatment or a chemical treatment to perform fine processing or patterning.
- the substrate is processed by anisotropic etching based on the wet method, and the portion of the substrate located below the vibrating portion including a part of the piezoelectric thin film is removed, thereby producing a floating structure including the vibrating portion.
- a piezoelectric thin-film resonator is obtained by separating it into device units. ...
- a conventionally known piezoelectric thin film resonator is formed by forming a base film, a lower electrode, a piezoelectric thin film, and an upper electrode on an upper surface of a substrate, and then, from a lower surface side of the substrate, a portion of the substrate below a portion serving as a vibration portion. It is manufactured by forming a via hole by removing the metal (see, for example, JP-A-58-1553412 and JP-A-60-142607). If the substrate is made of silicon, a via hole is formed by etching away a portion of the silicon substrate from the lower surface (back surface) using a heated KOH aqueous solution.
- a second conventional method for manufacturing a piezoelectric thin film resonator such as an FBAR or SBAR applied to a piezoelectric thin film device is to make an air-bridge type FBAR device (for example, see Japanese Patent Application Laid-Open No. 2-131109). No.).
- a sacrificial layer (Sacrifificialalayer) is first set, and then a piezoelectric thin film is formed on the sacrificial layer.
- cavities are formed on the upper surface of the substrate by etching, sacrificial layers are deposited on the upper surface of the substrate by thermal CVD (Chemica 1 Vapor Deposition), and CMP (Chemical Mechanical Polishing) is performed. Polishing and flattening of the top surface of the substrate by polishing,
- a method that form a via hole as vibration space by anisotropic etching from the substrate lower face side of the c above have a serious problem that it is difficult to produce a structure of FBAR or SBAR, air Purijji only the substrate upper surface
- a via hole having a side wall perpendicular to the substrate surface is formed from the lower surface side of the substrate by using a deep RIE (deep reactive ion etching) method.
- the shape of the formed vibration space differs depending on the position in the substrate surface where the piezoelectric thin film resonator is formed. Therefore, it is difficult to manufacture a piezoelectric thin-film resonator having a required resonance frequency, and when manufacturing multiple piezoelectric thin-film resonators on one substrate, the resonance frequency varies among the multiple piezoelectric thin-film resonators. There was a problem.
- FBAR and SBAR obtain resonance by the propagation of elastic waves in the thickness direction in a thin film, a film of a piezoelectric laminated structure composed of an insulating layer on the substrate, a lower electrode, a piezoelectric thin film, an upper electrode, etc.
- the characteristics are greatly affected not only by the thickness uniformity but also by the shape accuracy of the vibration space. For this reason, it is extremely difficult to obtain a plurality of piezoelectric thin film devices having uniform characteristics within the substrate.
- the present invention has been made in view of the above problems, and has as its object to simplify the process and to provide Provided are a method of manufacturing a piezoelectric thin film device capable of favorably forming a vibration space facing a piezoelectric laminated structure regardless of a position in a plate surface, and a piezoelectric thin film device manufactured by the method. That is.
- the present inventor formed a first via hole having a depth smaller than the thickness of the substrate from the lower surface side of the substrate, Forming a vibration space by forming a second via hole based on the bottom surface of the via hole has been found to be the most preferable solution in terms of both stabilization of the characteristics of the piezoelectric thin film device and cost reduction. .
- the vibration space is a piezoelectric thin-film device formed to allow vibration of a vibration portion configured to include at least a part of the piezoelectric laminated structure, wherein the vibration space is provided in the substrate.
- a second via hole formed toward the upper surface of the piezoelectric thin film device.
- a plurality of the vibrating portions are formed on an upper surface side of the substrate, and the first via hole shares a part of the vibration space for each of the plurality of vibrating portions.
- a plurality of the second via holes are formed corresponding to each of the plurality of vibrating portions from the intermediate surface.
- the second via hole is located at least 2 m inside the first via hole.
- the depth of the second via hole is 10 m to 150 ⁇ m.
- a method for manufacturing a piezoelectric thin film device as described above wherein a first space is formed in the substrate material from the lower surface to the upper surface of the substrate material when forming the vibration space of the substrate.
- a via hole is formed, and then a second via hole is formed from the bottom surface toward the upper surface of the substrate material so as to be located inside the first via hole when viewed in a vertical direction.
- a method of manufacturing a piezoelectric thin-film device wherein a hole is formed, and thereby the intermediate surface is formed by the bottom surface portion remaining in the substrate material.
- the piezoelectric thin-film device has a plurality of the vibrating portions on an upper surface side of the substrate, the first via hole is formed commonly for the plurality of vibrating portions, and the bottom surface is formed. And forming a plurality of the second via holes corresponding to each of the plurality of vibrating portions.
- an SOI wafer is used as the substrate material, and a part of the insulating layer forms a bottom surface of the first via hole.
- the second via hole is formed by a deep reactive ion etching method.
- the process is simple, and the vibration space facing the vibrating portion can be favorably formed irrespective of the position in the substrate surface, and thus depends on the position in the substrate surface.
- a piezoelectric thin film device having stable characteristics without variation in characteristics is provided.
- FIG. 1 is a schematic plan view showing an embodiment of a piezoelectric thin film device (piezoelectric thin film resonator) according to the present invention.
- FIG. 2 is a sectional view taken along line XX of FIG.
- FIG. 3 is a schematic plan view showing an embodiment of the piezoelectric thin film device (piezoelectric thin film filter) according to the present invention.
- FIG. 4 is a sectional view taken along line XX of FIG.
- FIG. 5 is a schematic plan view showing an embodiment of the piezoelectric thin film device (piezoelectric thin film filter) according to the present invention.
- FIG. 6 is a sectional view taken along line XX of FIG.
- FIG. 7 is a schematic cross-sectional view showing one embodiment of the piezoelectric thin film device of the present invention mounted on a microwave package.
- FIG. 8 is a schematic plan view showing the piezoelectric thin film device (piezoelectric thin film resonator) used in the comparative example.
- FIG. 9 is a sectional view taken along line XX of FIG.
- Figure 10 is a schematic diagram showing the piezoelectric thin film device (piezoelectric thin film filter) used in the comparative example. It is a schematic plan view.
- FIG. 11 is a sectional view taken along line XX of FIG.
- FIG. 12 is a schematic plan view showing the piezoelectric thin film device (piezoelectric thin film resonator) used in the comparative example.
- FIG. 13 is a sectional view taken along line XX of FIG.
- FIGS. 14A and 14B are schematic cross-sectional views illustrating an embodiment of a method for manufacturing the piezoelectric thin film device of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a schematic plan view showing an embodiment of a piezoelectric thin-film device (piezoelectric thin-film resonator 10) according to the present invention
- FIG. 2 is a cross-sectional view taken along line XX of FIG.
- the piezoelectric thin-film resonator 10 includes a substrate 12, an insulator layer 13 formed on the upper surface of the substrate 12, and a piezoelectric laminated structure 1 formed on the insulator layer 13.
- the piezoelectric laminated structure 14 includes a lower electrode 15 formed on the insulator layer 13, and a piezoelectric material formed on the insulator layer 13 so as to cover a part of the lower electrode 15. It comprises a film 16 and an upper electrode 17 formed on the piezoelectric film 16.
- the substrate 12 has a first via hole 21 forming a vibration space 20 from the lower surface to the upper surface. Further, a second via hole 22 forming a vibration space 20 is formed from the downward intermediate surface 25 corresponding to the bottom surface of the first via hole 21 toward the upper surface of the substrate. As is clear from FIG. 1, the second via hole 22 is located inside the first via hole 21 when viewed in the vertical direction. Thus, the first via hole 21 and the second via hole 22 constitute the vibration space 20.
- the vibration space 20 is formed so as to allow the vibration of the vibrating part 23 constituted by a part of the piezoelectric laminated structure 14 and a part of the insulating layer 13.
- the piezoelectric laminated structure 14 is formed on the upper surface side of the substrate 12. This is because, as shown in Fig. 2, another layer (the insulator layer 13 in Fig. 2) is formed on the upper surface of the substrate 12, and the piezoelectric laminated structure is interposed through that layer. 14 may be formed, or the surface layer of the substrate 12 may be processed to form another layer (eg, an insulator layer) in the substrate, and the piezoelectric laminated structure 14 may be formed thereon. As in the case, the piezoelectric laminated structure 14 may be formed directly on the upper surface of the substrate 12.
- the structure is not limited to one layer, and a plurality of layers may be interposed. Further, the layer to be interposed is not limited to the insulating layer.
- the substrate 12 a substrate made of a single crystal such as Si (100) single crystal or a substrate obtained by forming a silicon, diamond or other polycrystalline film on the surface of a base material such as a Si single crystal is used. be able to. Further, as the substrate 12, it is also possible to use another semiconductor or a substrate made of an insulator.
- the insulator layer 1 for example, a dielectric film composed mainly of oxide silicon (S i 0 2), a dielectric film mainly composed of nitride silicon (S i N x), and the oxide silicon A stacked film of a dielectric film containing a main component and a dielectric film containing silicon nitride as a main component can be used.
- the main component refers to a component whose content in the dielectric film is 50 equivalent% or more.
- the dielectric film may be composed of a single layer, or may be composed of a plurality of layers to which a layer for improving adhesion is added.
- the thickness of the insulator layer 13 is, for example, less than 2. ⁇ .
- Examples of the method for forming the insulator layer 13 include a thermal oxidation method and a CVD (Chemica 1 Vapor Deosition) method for the surface of the substrate 12. Further, in the present invention, the insulating layer 13 in a region corresponding to the vibrating portion 23 is entirely removed by etching, and the lower electrode 15 is exposed to the vibration space 20 so as to have a piezoelectric structure. Thin-film resonators can also be employed. Thus, by removing all the insulator layer 13 in the region corresponding to the vibrating part 23, the temperature characteristic of the resonance frequency is slightly deteriorated, but the acoustic quality factor (Q value) is improved. There are advantages.
- the lower electrode 15 is formed by laminating a metal layer formed by a sputtering method and a vapor deposition method and, if necessary, an adhesion metal layer formed between the metal layer and the insulator layer 13. , Its thickness is, for example, 50 ⁇ ! ⁇ 500 nm.
- the material is not particularly limited, gold (Au), platinum (Pt), titanium (T i), aluminum (A 1), molybdenum (Mo), tungsten (W) and the like are preferably used.
- Predetermined shape As a method of patterning, a photolithography technique such as dry etching or wet etching, or a lift-off method can be used as appropriate.
- a 1 N has a high propagation speed of elastic waves and is suitable as a piezoelectric film for a piezoelectric thin film device such as a piezoelectric thin film resonator or a piezoelectric thin film filter that operates in a high frequency band.
- the thickness is, for example, 0.5 / im to 3. ⁇ ⁇ .
- a photolithography technique such as dry etching and etching can be appropriately used. ⁇
- the upper electrode 17 a metal layer formed by a sputtering method, a vapor deposition method, or the like is used as in the lower electrode 15.
- the material gold (Au), platinum (Pt), titanium (Ti), aluminum (A1), molybdenum (Mo), tungsten (W) and the like are preferably used.
- the thickness of the upper electrode 17 is, for example, 50 ⁇ ! ⁇ 500 nm.
- a photolithography technique such as dry etching or wet etching, or a lift-off method is used as in the case of the lower electrode 15.
- FIGS. 14A and 14B an embodiment of the method of manufacturing the piezoelectric thin film device of the embodiment of FIGS. 1 and 2, particularly a method of forming the vibration space 20 of the substrate 12 will be described. .
- the above-described insulator layer 13 and piezoelectric laminated structure 14 are formed on the upper surface of a substrate material 12 ′ which is a material of the substrate 12.
- potassium hydroxide (KOH) or TMAH (tetramethylammonium hydroxide) is applied from the lower surface side of the substrate material 12 ′.
- KOH potassium hydroxide
- TMAH tetramethylammonium hydroxide
- the first via hole 21 does not reach the upper surface of the substrate material 12 ′, and a downward bottom surface 25 ′ is formed in the substrate material 12 ′.
- the bottom surface 25 ' is located at a distance T from the top surface of the substrate material 12'.
- a photoresist is applied to the entire lower surface of the substrate material 1 2 ′ including the bottom surface 25 ′ of the first via hole using a spray-type photo resist coating device or the like. Further, the photo resist in a portion corresponding to the vibrating portion to be formed is removed by photolithography, and the patterned photo resist is used as a mask to remove SF 6 or the like.
- the substrate material 1 2 ′ is removed from the bottom surface of the first via hole 25 until the insulating layer 13 is exposed.
- a second via hole 22 as shown in FIGS. 1 and 2 is formed by etching from the top of the substrate material to the upper surface.
- the second via hole 22 is located inside the first via hole 21 by a distance W. That is, the width of the intermediate surface 25 is W. W is preferably at least 2 / im, for example, 5 ⁇ ! 550 ⁇ m.
- the thickness of the photoresist to be applied varies depending on the depth of the second via hole 22, but is usually 0.5! ⁇ 4 im.
- the thickness of the applied photoresist is likely to be uneven due to the influence of the adjacent side wall surface, which causes a decrease in pattern accuracy.
- the machining accuracy itself by etching is apt to be reduced immediately near the end of the bottom surface 25. Therefore, if the width of the intermediate surface 25 is too small, the dimensional accuracy of the formed second via hole 22 is reduced, and the yield tends to be reduced.
- the width of the intermediate surface 25 is too large, the amount of the final product obtained per substrate material tends to decrease.
- the width of the intermediate surface 25 is too large, the metal electrode connecting the adjacent piezoelectric thin-film resonators becomes longer, and the electrical Since the resistance increases, the insertion loss of the manufactured piezoelectric thin film device tends to increase.
- the dimension of the second via hole 22, that is, the thickness of the substrate 12, excluding the depth of the first via hole 21, is T.
- T is preferably from 10 ⁇ m to 150 / m, more preferably from 15 to: l OO / zm, and particularly preferably from 20 to 80 ⁇ . It is. If the depth T of the second via hole 22 is too large, the processing accuracy of the second via hole 22 tends to decrease, and the yield tends to decrease. If the depth is too small, the strength of the vibrating portion 23 and its surroundings is reduced, and the probability of breakage in a manufacturing process such as a dicing process tends to increase significantly.
- the entire thickness of the substrate can be formed all at once using a dry etching method or deep RIE method. compared to perform, processing unevenness due to E Tsuchingu speed difference in the substrate surface is reduced, especially c stability of the machining shape is remarkably improved, vibration in the characteristics of the resonator exposed vibrating unit 2 3
- the shape of the opening of the space 20, that is, the shape of the opening of the second via hole 22 on the upper surface side of the substrate 12 affects the shape.
- the formation of the second via hole 22 Since it is sufficient to go to a depth T smaller than the thickness of the second via hole 22, the shape of the opening of the second via hole 22 can be made required with high accuracy. Thus, it is possible to manufacture a piezoelectric thin-film resonator having stable characteristics regardless of the position in the substrate plane.
- FIG. 3 is a schematic plan view showing an embodiment of the piezoelectric thin film device (piezoelectric thin film filter 11) according to the present invention, and FIG. In these figures, members having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals.
- a common first via hole 21 is formed for four vibrating portions 23 adjacent to each other, which are constituted by a part of the piezoelectric laminated structure 14 and a part of the insulating layer 13.
- the second via hole 22 is formed individually from the intermediate surface 25 corresponding to the bottom surface of the via hole to each vibrating portion 23.
- the first via hole 21 is formed so as to share a part of the vibration space for each of the plurality of vibrating portions 23, the first substrate 12 having a large thickness is used.
- the distance between the vibrating parts adjacent to each other can be adjusted only by the distance between the second via holes, and the adjacent vibrating parts can be brought close to each other, so that the substrate can be used effectively and Since the connected wiring and the like can be shortened, it is possible to provide an excellent filter and the like with little signal loss.
- FIG. 5 shows still another example of the piezoelectric thin film device (piezoelectric thin film filter 11) according to the present invention.
- FIG. 6 is a schematic plan view showing the embodiment, and FIG. 6 is a sectional view taken along line XX of FIG.
- members having the same functions as the members in FIGS. 1 to 4 are denoted by the same reference numerals.
- a SOI (Silicon Insul sat aor) wafer is used as the substrate 12.
- the SOI wafer is composed of an unoxidized wafer (base wafer) 12a and an insulating layer 12c consisting of a necessary oxide film. Then, the other side (active layer side) of the pound wafer 12b is ground and polished, so that the insulating layer 12c is arranged at an arbitrary position in the thickness direction of the substrate 12.
- the insulating layer 12 c of the SOI wafer is removed by photolithography with a hydrofluoric acid buffer solution into a specific shape so as to form an appropriate vibrating portion 23, and the remaining portion is left.
- the Deep RIE method is performed using the insulating layer alone or both the residual insulating layer and the residual photoresist as a mask. Therefore, the processing accuracy is remarkably improved, and it becomes possible to manufacture a piezoelectric thin film filter having substantially uniform characteristics over the entire surface of the substrate.
- piezoelectric thin film devices piezoelectric thin film resonators having the structures shown in FIGS. 1 and 2 were manufactured using a common substrate as follows.
- the resist was patterned into a predetermined shape using a photomask for the upper electrode, and a 0.17 / zm-thick Mo layer was formed by a DC magnetron pack method. . Further, the Mo layer was patterned into a desired shape by performing ultrasonic cleaning in a resist stripper to form an upper electrode.
- a photoresist is applied to the lower surface of the Si wafer on which the insulating layer made of the thermal oxide film and the piezoelectric multilayer structure are formed on the upper surface by the above method, and the photomask of the first via hole is used. Patterning was performed, and a part of the thermal oxide film on the lower surface side was removed using a fluoric acid buffer solution. Subsequently, using this thermal oxide film as a mask, wet etching is performed in an aqueous KOH solution to perform etching to a depth of 150 ⁇ m, which is 75% of the substrate thickness, and a plurality of first via holes are formed. Was formed.
- the photoresist was applied to the entire lower surface of the substrate including the bottom surface of the first via hole using a spray-type photoresist application device. Further, using a photomask having a shape equal to the shape of the vibrating portion to be formed, the photoresist is patterned, and using this as a mask, etching is performed by a Deep RIE apparatus until the thermal oxide film formed on the upper surface of the wafer is exposed. A second via hole having a vertical side wall was formed, and thus a vibration space including the first via hole and the second via hole was produced. The minimum width of the intermediate plane was 5 m.
- a plurality of vibrating portions were formed on the entire surface of the 4-inch Si substrate, and a plurality of piezoelectric thin film resonators were formed.
- the resonance frequency of the formed piezoelectric thin-film resonator was evaluated using a network analyzer.
- a GSG microphone port prober was brought into contact with the I / O terminal of the resonator.
- the percentage was as shown in Table 1.
- piezoelectric thin film device piezoelectric thin film resonator having the structure shown in FIGS. 1 and 2 was manufactured as follows.
- a piezoelectric thin-film resonator was manufactured in the same manner as in Example 1 except that the depths of the first via hole and the second via hole were set to 180 ⁇ m and 20 ⁇ m, respectively.
- the size and thickness of the substrate, the depths of the first and second via holes, the breakage rate, the frequency distribution, and the depth yield of the obtained piezoelectric thin-film resonator in this example are as shown in Table 1. .
- piezoelectric thin film device piezoelectric thin film resonator having the structure shown in FIGS. 1 and 2 was manufactured as follows.
- a piezoelectric thin-film resonator was fabricated in the same manner as in Example 1 except that the depths of the first via hole and the second via hole were set to 100 m and 100 ⁇ m, respectively. .
- the size and thickness of the substrate, the depths of the first and second via holes, the breakage rate of the obtained piezoelectric thin film resonator, the frequency distribution, and the device yield in this example are as shown in Table 1. .
- a piezoelectric thin film device (piezoelectric thin film filter) having the structure shown in FIGS. 3 and 4 was manufactured as follows.
- a 6-inch (100) Si wafer with a thickness of 300 / m was used, and the depths of the first via hole and the second via hole were set to 240 / Xm and 60 / Xm, respectively.
- a piezoelectric thin film filter was manufactured in the same manner as in the method shown in Example 1.
- Table 1 shows the size and thickness of the substrate, the depths of the first and second via holes, the breakage rate, the frequency distribution, and the device yield of the obtained piezoelectric thin-film filter in this example.
- a piezoelectric thin film device (piezoelectric thin film filter) having the structure shown in FIGS. 3 and 4 was manufactured as follows.
- a piezoelectric thin-film filter was produced in the same manner as in Example 4, except that the depths of the first via hole and the second via hole were set to 200 m and 100 Zm, respectively.
- Table 1 shows the size and thickness of the substrate, the depths of the first and second via holes, the breakage rate of the obtained piezoelectric thin-film filter, the frequency distribution, and the yield of the devise in this example.
- piezoelectric thin film devices piezoelectric thin film filters having the structures shown in FIGS. 5 and 6 were manufactured using a common substrate as follows.
- a photoresist was applied on the upper surface side (active layer side), and a resist pattern for a lower electrode was formed as shown in FIGS.
- a resist stripper was used.
- the Mo layer was patterned into a desired shape to form a lower electrode.
- a reactive magnetron sputtering method was used to obtain a total gas pressure of 0.5 Pa, a gas composition of ⁇ -e / 1,
- an AlN piezoelectric film having a thickness of 1.40 // m was formed.
- the A 1 N piezoelectric film was patterned into a predetermined shape shown in FIGS. 5 and 6 by wet etching using hot phosphoric acid.
- a photoresist is applied, a resist is patterned into a predetermined shape using a photomask for the upper electrode, and a 0.17 ⁇ m-thick Mo layer is formed by DC magnetron sputtering. did. Further, by performing ultrasonic cleaning in a resist stripper, the Mo layer was patterned into a desired shape to form an upper electrode.
- a photoresist is applied to the lower surface side of the SOI wafer on which the insulator layer made of the thermal oxide film and the piezoelectric laminated structure are formed on the upper surface, and patterned using the photomask of the first via hole. Then, a part of the thermal oxide film on the lower surface side was removed using a fluoric acid buffer solution. Subsequently, using the thermal oxide film as a mask, the insulating layer of the SOI wafer was etched by wet etching in a KOH aqueous solution.
- a photoresist is applied to the entire lower surface of the substrate including the bottom surface of the first via hole using a spray-type photo resist coating apparatus, and a photo mask having a shape equal to the shape of the vibrating portion to be formed is used.
- the photoresist was patterned.
- a part of the insulating layer of the SOI wafer is removed using a hydrofluoric acid buffer solution, and the remaining photoresist and the remaining insulating layer are used as a mask to form a thermal mask formed on the upper surface of the wafer by a Deep RIE apparatus.
- a second via hole was formed, and thus a vibration space including the first via hole and the second via hole was formed.
- a plurality of vibrating portions were formed on the entire surface of the 6-inch SOI substrate, and a plurality of piezoelectric thin film filters were formed.
- the center frequency of the formed piezoelectric thin film filter was evaluated using a network analyzer. A 0.5 micro prober was brought into contact with the 10 terminal of the resonator.
- a piezoelectric thin film device (piezoelectric thin film filter) having the structure shown in FIGS. 5 and 6 was manufactured as follows.
- a piezoelectric thin-film filter was manufactured in the same manner as in Example 6, except that an SOI wafer having an active layer thickness of 20 m and an insulating layer thickness of 0.5 m was used.
- Table 1 shows the size and thickness of the substrate, the depths of the first and second via holes, the breakage rate of the obtained piezoelectric thin film filter, the frequency distribution, and the device yield in this example.
- the substrate on which the plurality of piezoelectric thin film devices were formed by the above process was cut into a shape of less than 1 mm using a dicing saw to obtain a desired chip for each depiice. Since it is inconvenient to handle the chip in the form of a chip, it was housed in a ceramic package as shown in Figure 7. In a general ceramic package, a chip having multiple input / output pads is connected by wire bonding.In this embodiment, flip-chip bonding technology was used to reduce device dimensions. .
- FIG. 7 shows a device 30 in which the chip of the piezoelectric thin film filter 11 is mounted on the microwave package 31 by flip-chip bonding.
- the package 31 includes a package substrate 32 and a cap 33.
- the bonding pad 40 connected to the lower electrode or upper electrode of the piezoelectric thin film filter 11 is disposed in a microwave package 31 such as ceramics via a bonding member 34 such as an Au bump or a solder bump.
- Signal path 35 is connected to an external terminal 36 provided outside the package through the inside of a package substrate 32 of ceramic or the like.
- the chip shape is 1 mm square, the size of the die becomes 3 mm square by the wire-bonding method. Philip chip bonding can be downsized to 2.3 mm square.
- FIGS. 8 and 9 a piezoelectric thin-film resonator having the structure shown in FIGS. 8 and 9 was manufactured as follows.
- members having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals.
- the insulating layer and the insulating layer were formed on the upper surface of the substrate by using the same method as described in Example 1. (4) A piezoelectric laminated structure was manufactured.
- a photoresist is applied to the lower surface of the Si wafer, patterned using the photomask for forming the second via hole described in Example 1, and the lower surface is exposed using a hydrofluoric acid buffer solution. A part of the thermal oxide film was removed. Next, using the remaining thermal oxide film and photo resist as a mask, etching is performed by a Deep RIE device until the thermal oxide film formed on the upper surface of the wafer is exposed, forming a via hole with the sidewalls set up vertically. As a result, a space for vibration was created.
- a plurality of piezoelectric thin film resonators were formed on the entire surface of the 4-inch Si substrate.
- the resonance frequency of the formed piezoelectric thin film resonator was evaluated using a network analyzer.
- a GSG microprober was brought into contact with the I / O terminal of the resonator.
- Table 1 shows the size and thickness of the substrate, the breakage rate, the frequency distribution, and the device yield of the obtained piezoelectric thin film resonator in this comparative example.
- a piezoelectric thin film filter having the structure shown in FIGS. 10 and 11 was manufactured as follows.
- members having the same functions as those in FIGS. 3 and 4 are denoted by the same reference numerals.
- an insulator layer and a piezoelectric laminated structure were produced on the upper surface of the substrate by using the same method as that described in Example 4.
- a photoresist is applied to the lower surface of the Si wafer, patterned using the photomask for forming the second via hole described in Example 4, and the lower surface is exposed using a hydrofluoric acid buffer solution. A part of the thermal oxide film was removed. Subsequently, using the remaining thermal oxide film and photoresist as a mask, etching is performed by a Deep RIE device until the thermal oxide film formed on the upper surface of the wafer is exposed, thereby forming a via hole having a vertical sidewall. As a result, a space for vibration was created.
- an insulating layer and a piezoelectric laminated structure were produced on the upper surface of the substrate by using the same method as that described in Example 1 except that a different photomask was used.
- a photoresist is applied to the lower surface of the Si wafer, patterned using a photomask for forming a via hole for wet etching, and a part of the thermal oxide film on the lower surface is etched using a hydrofluoric acid buffer solution. Removed.
- anisotropic etching was performed in a KOH aqueous solution until the thermal oxide film formed on the upper surface of the wafer was exposed to form a via hole, thereby producing a vibration space.
- a plurality of piezoelectric thin film resonators were formed on the entire surface of the 4-inch Si substrate.
- the resonance frequency of the formed piezoelectric thin film resonator was evaluated using a network analyzer.
- a GSG microproper was brought into contact with the I / O terminal of the resonator.
- Table 1 shows the size and thickness of the substrate, the breakage rate, the frequency distribution, and the device yield of the obtained piezoelectric thin film resonator in this comparative example.
- the manufacturing process of the piezoelectric thin film device is simplified.
- the effect of the difference in etching rate when forming via holes in the substrate surface, especially the second via hole, and the uniformity of the processed shape can be reduced, and the characteristics of the piezoelectric thin film device are extremely stable regardless of the position in the substrate surface. It can be made.
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Abstract
Description
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US10/551,680 US20060202769A1 (en) | 2003-03-31 | 2004-03-30 | Piezoelectric thin film device and method of producing the same |
JP2005504238A JP4395892B2 (ja) | 2003-03-31 | 2004-03-30 | 圧電薄膜デバイス及びその製造方法 |
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JP2006129195A (ja) * | 2004-10-29 | 2006-05-18 | Kyocera Kinseki Corp | 圧電薄膜素子 |
JP2006180304A (ja) * | 2004-12-24 | 2006-07-06 | Hitachi Media Electoronics Co Ltd | 圧電バルク共振子およびその製造方法、圧電バルク共振子を用いたフィルタ、それを用いた半導体集積回路装置、並びにそれを用いた高周波モジュール |
JP2006332730A (ja) * | 2005-05-23 | 2006-12-07 | Kyocera Corp | 薄膜バルク音響波共振子およびフィルタならびに通信装置 |
JP2007006486A (ja) * | 2005-06-20 | 2007-01-11 | Avago Technologies General Ip (Singapore) Private Ltd | 懸架型デバイスおよびその製造方法 |
JP2015019310A (ja) * | 2013-07-12 | 2015-01-29 | 富士フイルム株式会社 | ダイアフラム型共振memsデバイス用基板、ダイアフラム型共振memsデバイス及びその製造方法 |
WO2016175013A1 (ja) * | 2015-04-30 | 2016-11-03 | 株式会社村田製作所 | 圧電デバイス、圧電トランスおよび圧電デバイスの製造方法 |
JP2018067902A (ja) * | 2016-10-17 | 2018-04-26 | ウィン セミコンダクターズ コーポレーション | 質量調整構造付きバルク音波共振器およびバルク音波フィルター |
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JP2006129195A (ja) * | 2004-10-29 | 2006-05-18 | Kyocera Kinseki Corp | 圧電薄膜素子 |
JP2006180304A (ja) * | 2004-12-24 | 2006-07-06 | Hitachi Media Electoronics Co Ltd | 圧電バルク共振子およびその製造方法、圧電バルク共振子を用いたフィルタ、それを用いた半導体集積回路装置、並びにそれを用いた高周波モジュール |
JP2006332730A (ja) * | 2005-05-23 | 2006-12-07 | Kyocera Corp | 薄膜バルク音響波共振子およびフィルタならびに通信装置 |
JP4663401B2 (ja) * | 2005-05-23 | 2011-04-06 | 京セラ株式会社 | 薄膜バルク音響波共振子およびフィルタならびに通信装置 |
JP2007006486A (ja) * | 2005-06-20 | 2007-01-11 | Avago Technologies General Ip (Singapore) Private Ltd | 懸架型デバイスおよびその製造方法 |
JP2015019310A (ja) * | 2013-07-12 | 2015-01-29 | 富士フイルム株式会社 | ダイアフラム型共振memsデバイス用基板、ダイアフラム型共振memsデバイス及びその製造方法 |
WO2016175013A1 (ja) * | 2015-04-30 | 2016-11-03 | 株式会社村田製作所 | 圧電デバイス、圧電トランスおよび圧電デバイスの製造方法 |
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JP2018067902A (ja) * | 2016-10-17 | 2018-04-26 | ウィン セミコンダクターズ コーポレーション | 質量調整構造付きバルク音波共振器およびバルク音波フィルター |
JP2021520755A (ja) * | 2018-09-26 | 2021-08-19 | 中国科学院蘇州納米技術与納米▲ファン▼生研究所 | フィルムバルク音響波共振器およびその製造方法 |
JP7306726B2 (ja) | 2018-09-26 | 2023-07-11 | 中国科学院蘇州納米技術与納米▲ファン▼生研究所 | フィルムバルク音響波共振器の製造方法 |
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JP4395892B2 (ja) | 2010-01-13 |
US20060202769A1 (en) | 2006-09-14 |
JPWO2004088840A1 (ja) | 2006-07-06 |
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