WO2005060091A1 - 圧電薄膜デバイスの製造方法および圧電薄膜デバイス - Google Patents
圧電薄膜デバイスの製造方法および圧電薄膜デバイス Download PDFInfo
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- WO2005060091A1 WO2005060091A1 PCT/JP2004/018890 JP2004018890W WO2005060091A1 WO 2005060091 A1 WO2005060091 A1 WO 2005060091A1 JP 2004018890 W JP2004018890 W JP 2004018890W WO 2005060091 A1 WO2005060091 A1 WO 2005060091A1
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- piezoelectric thin
- thin film
- insulating layer
- sacrificial layer
- film device
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- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
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- 229910004298 SiO 2 Inorganic materials 0.000 description 1
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- NKZSPGSOXYXWQA-UHFFFAOYSA-N dioxido(oxo)titanium;lead(2+) Chemical compound [Pb+2].[O-][Ti]([O-])=O NKZSPGSOXYXWQA-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
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- 229910052732 germanium Inorganic materials 0.000 description 1
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- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
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- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- 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
- H03H3/04—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 for obtaining desired frequency or temperature coefficient
-
- 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
- H03H9/173—Air-gaps
-
- 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
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/07—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base
- H10N30/074—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing
- H10N30/076—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing by vapour phase deposition
Definitions
- the present invention relates to a method for manufacturing a piezoelectric thin-film device manufactured by singly or in combination of a plurality of piezoelectric thin-film resonators using a piezoelectric thin film. More specifically, the present invention relates to a communication device filter. The present invention relates to a method of manufacturing a piezoelectric thin-film device used for the same and the like, and a piezoelectric thin-film device manufactured by the method.
- SAW Surface Acoustic Wave
- FBAR FBAR
- SBAR Thin Film Bulk Acoustic Resonators and Filters
- Piezoelectric thin-film resonators such as FBARs and SBARs applied to resonators, filters, and the like utilizing such elastic waves are manufactured as follows.
- a dielectric thin film, a conductive thin film, or a conductive thin film is formed on a substrate such as a semiconductor single crystal such as silicon, a polycrystalline diamond formed on a silicon wafer, and a constant elastic metal such as Elinvar by various thin film forming methods. Are formed to form a base film. On this base film A piezoelectric thin film is formed, and an upper structure is formed as necessary. After the formation of each layer or after the formation of all layers, each film is subjected to physical processing or chemical processing to perform fine processing and patterning.
- a floating structure is formed by removing a portion located below the vibrating portion from the substrate by anisotropic etching based on a wet method, and finally, a piezoelectric thin film resonator is obtained by separating the device into units of one device.
- one of the conventionally known methods for manufacturing a piezoelectric thin film resonator is to form a lower base film, a lower electrode, a piezoelectric thin film, and an upper electrode on the upper surface of a substrate and then vibrate from the lower surface side of the substrate.
- This is a method in which a via hole is formed by removing a substrate portion below a portion to be a part (for example, see Patent Documents 1 and 2). If the substrate is made of silicon, a via hole is formed by etching off a part of the silicon substrate from the back surface using a carothermal K ⁇ H aqueous solution. This makes it possible to manufacture a resonator having a configuration in which the edge of the structure in which the piezoelectric thin film is sandwiched between the plurality of metal electrodes is supported by the portion around the via hole on the upper surface side of the silicon substrate.
- the etching proceeds in parallel with the (111) plane, and the etching proceeds at an inclination of 54.7 degrees with respect to the (100) silicon substrate surface.
- the distance between adjacent resonators must be significantly greater.
- a device with a top dimension of about 150 ⁇ m x 150 ⁇ m, built on a silicon wafer with a thickness of 550 ⁇ m, requires a backside etching hole of about 930 ⁇ m x 930 ⁇ m and an adjacent side hole.
- the center-to-center distance of matching resonators is more than 930 / m.
- Patent Document 3 describes the configuration and manufacturing method of an air-barrier FBARZSBAR device using phosphorus-doped silicate glass (PSG) as a sacrificial layer.
- PSG phosphorus-doped silicate glass
- a cavity is formed on the upper surface of the substrate by etching, a sacrificial layer is deposited on the upper surface of the substrate by thermal CVD (Chemical Vapor Deposition), and CMP ( After a series of processes such as planarization and smoothing of the top surface of the substrate by polishing, deposition of the lower electrode, piezoelectric material and upper electrode on the sacrificial layer, and pattern formation, a via hole (hole) penetrating to the sacrificial layer.
- thermal CVD Chemical Vapor Deposition
- CMP Chemical Vapor Deposition
- Patent Document 4 discloses that an air bridge type FBAR device requires a step of forming a cavity in the upper surface of a substrate and flattening the upper surface of the substrate by CMP polishing by using a metal or a polymer as a sacrificial layer.
- the structure and manufacturing method of an air bridge type FBAR / SBAR device that forms a vibration space by relatively simple steps are described.
- the thickness of the sacrificial layer needs to be about 2000 nm. .
- the surface of the sacrificial layer becomes rougher due to the growth of metal crystal grains.
- the electromechanical coupling coefficient Kt 2 decreases due to the decrease in the crystal orientation of the piezoelectric thin film itself, and resonance occurs due to the increase in the surface roughness of the piezoelectric multilayer structure itself.
- Patent Document 5 discloses that an air-bridge type FBAR device does not require a step of forming a cavity in the upper surface of the substrate or flattening the upper surface of the substrate by CMP polishing. The configuration and manufacturing method of the air-bridge type FBARZSBAR device that can reduce the size of the device are described.
- the sacrificial layer is etched in advance with the first etching solution, and further, the second etching solution is introduced using the voids to etch the support film, thereby forming the vibration space. Therefore, it is necessary to use a material that is resistant to two types of etchants, which not only severely restricts the materials used, but also complicates the process and increases the manufacturing cost.
- Materials such as magnesium oxide and zinc oxide are used for the sacrificial layer.
- the surface of the sacrificial layer has a large surface roughness and is formed on the surface.
- the crystal orientation of the lower electrode and the piezoelectric thin film deteriorates. For example, in the case of a 50 nm-thick magnesium oxide thin film, its surface roughness (RMS variation in height) is usually 10 nm or more.
- Patent Document 1 JP-A-58-153412
- Patent Document 2 JP-A-60-142607
- Patent Document 3 JP-A-2000-69594
- Patent Document 4 Japanese Patent Publication No. 2002-509644
- Patent Document 5 JP-A-2003-32060
- FBARs and SBARs obtain resonance by the propagation of elastic waves generated by the piezoelectric effect of the piezoelectric material in the piezoelectric multilayer structure, the lower electrode, the piezoelectric thin film, and the upper
- the characteristics are greatly affected not only by the crystal quality of the electrodes and the like, but also by the accuracy of the formation of the vibration space. Furthermore, if the bending of the piezoelectric thin film is large, the strength of the piezoelectric thin film is reduced, and the reliability is significantly reduced. Therefore, it is extremely difficult to stably obtain a highly reliable piezoelectric thin film device having excellent characteristics.
- the present invention has been made in view of the above problems, and an object of the present invention is to simplify the process, to form a vibration space well below the piezoelectric laminated structure, and to improve the characteristics.
- An object of the present invention is to provide a method for manufacturing an excellent and highly reliable piezoelectric thin film device, and a piezoelectric thin film device manufactured by the method. Means for solving the problem
- the present inventors have formed an insulating layer on a substrate which is etched in advance with a specific chemical substance, A sacrificial layer whose material strength is higher than that of the insulating layer by an etching rate by the specific chemical substance is formed in a region serving as a space, and the sacrificial layer is removed by etching and an insulating layer provided below the sacrificial layer is removed.
- Forming the vibration space by performing etching removal of the corresponding part using the above-mentioned specific chemical substance as an etchant is the most preferable solution in terms of both high performance and low cost of the piezoelectric thin film device. It was found to be a means.
- a piezoelectric laminated structure including a piezoelectric thin film and an upper electrode and a lower electrode formed on both upper and lower surfaces thereof is supported by a substrate, and a vibration space is formed so as to allow the piezoelectric laminated structure to vibrate.
- a method of manufacturing a formed piezoelectric thin film device comprising: forming an insulating layer on a substrate upper surface with a specific chemical substance; and forming the specific chemical substance on a partial region on the insulating layer.
- the via hole is formed to penetrate at least one of the lower electrode, the piezoelectric thin film, and the upper electrode so as to expose a part of the sacrificial layer.
- the via hole is formed through the substrate so as to expose a part of the insulating layer.
- the material of the insulating layer is mainly composed of silicate glass or silicate glass, and the material of the sacrificial layer is titanium.
- the material of the insulating layer is aluminum nitride, and the material of the sacrificial layer is aluminum.
- the method for manufacturing a piezoelectric thin-film device is characterized in that after the sacrificial layer is formed, etching is performed on the sacrificial layer and the insulating layer by the specific chemical substance. Laminating a second insulating layer made of a material having a lower speed than the insulating layer.
- One embodiment of the present invention is a nitride or oxynitride insulator mainly composed of aluminum nitride or silicon nitride.
- the thickness of the sacrificial layer is 20 nm to 600 nm, preferably 2 Onm to 90 nm.
- the surface roughness of the upper surface of the sacrificial layer is 5 nm or less in RMS variation in height.
- the thickness of the insulating layer is 500 nm to 3000 nm.
- a piezoelectric laminated structure including a piezoelectric thin film and an upper electrode and a lower electrode formed on both upper and lower surfaces thereof is supported by a substrate via an insulating layer, and allows the piezoelectric laminated structure to vibrate.
- a surface distance between an upper surface of the insulating layer and a lower surface of the lower electrode in the vibration space is 20 nm to 600 nm, preferably 20 nm to 90 nm. In one embodiment of the present invention, a surface distance between an upper surface of the insulating layer and a lower surface of the vibration space is 500 nm to 3000 nm.
- a polishing technique such as CMP can be realized.
- a vibration space can be favorably formed below the piezoelectric laminated structure by a simple process without using it, and a highly reliable piezoelectric thin film device having excellent characteristics can be stably manufactured.
- the piezoelectric thin film device of the present invention has a good vibration space below the piezoelectric multilayer structure, the piezoelectric thin film device has excellent characteristics and high reliability. Therefore, the piezoelectric thin film device having the obtained vibration space is combined. Therefore, it is suitable for producing a piezoelectric thin film device such as a filter and a duplexer.
- FIG. 1 is a schematic plan view showing a first 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 upward and downward directions indicate the upward and downward directions in the figure when the piezoelectric thin film device is arranged as shown in FIG. Therefore, the expressions of the upper surface, the lower surface, etc. follow these directions.
- the piezoelectric thin-film resonator 10 is formed so as to straddle a substrate 11, an insulating layer 12 formed on the upper surface of the substrate 11, and a vibration space 20 formed by removing a part of the insulating layer.
- the piezoelectric laminated structure 14 is provided.
- the piezoelectric laminated structure 14 includes a lower electrode 15, a piezoelectric thin film 16 formed so as to cover a part of the lower electrode 15, and an upper electrode 17 formed on the piezoelectric thin film 16.
- FIG. 3 (a)-(e) are explanatory views showing a series of manufacturing steps of the first embodiment in a cross section XX similar to FIG.
- an insulating layer 12 is formed on a substrate 11.
- a sacrifice layer 13 in which the etching rate by a specific chemical substance is higher than that of the insulating layer 12 is formed on a region corresponding to the vibration space 20 on the insulating layer 12. I do.
- a piezoelectric laminated structure 14 including a lower electrode 15, a piezoelectric thin film 16, and an upper electrode 17 is formed on the sacrificial layer 13 and the insulating layer 12.
- a via hole 18 is provided so as to expose a part of the sacrificial layer 13 through the piezoelectric layer 16 and the lower electrode 15.
- an etching solution (the above-mentioned specific chemical substance) for etching the sacrificial layer and the insulating layer is introduced from the via hole. Since the sacrifice layer 13 is selected from a material having an etching rate higher than that of the insulating layer 12, the sacrifice layer 13 is first removed by etching faster than the insulating layer 12, and the etchant is favorably introduced into the voids formed thereby. Is done.
- the etching liquid is introduced into the gap from which the sacrificial layer 13 has been removed, so that the insulating layer 12 is mainly etched in the thickness direction and is located below the sacrificial layer 13.
- the portion of the insulating layer 12 to be etched is satisfactorily etched away. Since the etching of the portion of the insulating layer 12 corresponding to the end of the sacrificial layer 13 is isotropic, the force to be further etched in the lateral direction is about the thickness of the insulating layer 12.
- the vibration space 20 is substantially limited to a portion where the sacrificial layer 13 is removed and a portion of the insulating layer located below the portion.
- the sacrifice layer and the insulating layer are etched by the same etching liquid (specific chemical substance).
- the substrate 11 may be a single crystal ueno such as Si (100) or an SOI (Silicon on Insula). tor) wafers can be used. It is also possible to use a semiconductor single crystal wafer such as gallium arsenide and an insulating substrate such as quartz glass.
- the insulating layer 12 for example, an insulating film mainly composed of silicate glass (SiO 2)
- a minimum (A1N) film can be used.
- the main component means that the content in the film is 50 equivalents
- a thermal oxide film by a thermal oxidation method As a method for forming an insulating film mainly composed of silicate glass, when a silicon wafer is used as a substrate, formation of a thermal oxide film by a thermal oxidation method can be mentioned first.
- the surface roughness of the silicon wafer is less than 0.3 nm in RMS variation of height. Since the thermal oxide film is formed directly by oxidation of the silicon wafer, the surface roughness is almost the same as that of the silicon wafer, and compared with a method in which a sacrificial layer is deposited in advance and flattened by CMP polishing technology. This is also preferable because the surface roughness of the piezoelectric laminated structure can be reduced.
- silicate glass In addition to thermal oxide films, silicate glass, phosphorus-doped silicate glass (PSG), boron-doped silicate glass (BSG), and boron-doped silicate glass (BPSG), etc., deposited by CVD (Chemical Vapor Deposition) are also available. Selected.
- the aluminum nitride (A1N) film can be formed by, for example, a sputtering method. It is convenient to use an aluminum nitride film as the insulating layer because the same film forming apparatus can be used when the aluminum nitride film is used as the piezoelectric thin film.
- the piezoelectric laminate formed thereon can be obtained with a large electromechanical coupling coefficient. If the bandwidth of the piezoelectric thin film device can be widened, the resonance sharpness and the Q value that can be reduced by force increase, and the attenuation of the obtained piezoelectric thin film device can be increased.
- the insulating layer 12 may be a single layer, or may have a plurality of layers including a layer for improving adhesion and a protective layer for preventing the components of the original insulating layer from diffusing to the substrate side. It may be composed of layers.
- the thickness of the insulating layer 12 is preferably between 500 nm and 3000 nm.
- the thickness is less than 500 nm, the possibility that the part of the piezoelectric laminated structure comes into contact with the substrate due to the radius of the piezoelectric laminated structure and adversely affects the characteristics increases significantly.
- the thickness exceeds 3000 nm, the etching time becomes longer to form the vibration space, and the etching of the insulating layer corresponding to the end of the sacrificial layer proceeds in the lateral direction, and the accuracy of the vibration space is reduced. Not only adversely affects the piezoelectric layer structure, but also lowers the yield of the piezoelectric laminate structure due to the separation of the lower electrode.
- the sacrificial layer 13 is selected from a material whose etching rate by a specific chemical substance is larger than that of the insulating layer 12.
- titanium (Ti) can be suitably used as the material of the sacrificial layer 13.
- the silicate glass include phosphorus-doped silicate glass (PSG), boron-doped silicate glass (BSG), and boron-doped silicate glass (BPSG).
- hydrofluoric acid or a hydrofluoric acid buffer can be used as the etching solution.
- titanium (Ti) has an etching rate several times higher than that of silicate glass.
- the width of the etching of the insulating layer located corresponding to the end of the sacrifice layer can be reduced in the lateral direction, and the shape of the vibration space can be accurately controlled.
- germanium Ge
- a mixed solution of hydrofluoric acid and aqueous hydrogen peroxide can be suitably used as the etching solution.
- aluminum nitride is used as the material of the insulating layer 12
- aluminum can be suitably used as the material of the sacrificial layer 13.
- heated phosphoric acid or the like can be used as the etching solution.
- the sacrificial layer 13 may be a layer made of a single material, or may be composed of two or more layers if the lowermost layer in contact with the insulating layer 12 has a layer made of a substance having a high etching rate. May be different. Since the characteristics of the piezoelectric thin film resonator are greatly affected by the crystal quality of the piezoelectric thin film, it is preferable to improve the crystal quality of the lower electrode 15 and the piezoelectric thin film 16 by appropriately selecting the material of each layer of the sacrificial layer. .
- the thickness of the sacrificial layer 13 is 20-600 nm, preferably 20-90 nm.
- the thickness is less than 20 nm, the penetration of the etchant is slow.It takes a long time to etch the insulating layer, and the etching of the insulating layer located corresponding to the end of the sacrificial layer proceeds in the lateral direction, The accuracy of the vibration space is reduced.
- the thickness exceeds 90 nm, the resonance characteristics of the obtained piezoelectric thin film device tend to slightly decrease.
- the thickness exceeds 600 nm, the time required for forming the vibration space is shortened and the processing accuracy is improved, but the bending of the end of the piezoelectric laminated structure becomes large, so that the piezoelectric thin film is formed. As soon as cracks occur, the reliability decreases.
- photolithography such as dry etching or wet etching is used. A lithography technique or a lift-off method can be appropriately used.
- 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 insulating layer 12 and the sacrifice layer 13. It is composed of a metal layer and has a thickness of, for example, 50-500 nm.
- the material of the lower electrode 15 is not particularly limited, gold (Au), platinum (Pt), titanium (Ti), aluminum (A1), molybdenum (Mo), tungsten (W), iridium (Ir), Ruthenium (Ru) is preferably used.
- a sacrifice layer made of a single material when a sacrifice layer made of a single material is used, its material must be appropriately selected so as not to adversely affect the resistance to the etching solution and the crystal quality of the piezoelectric thin film.
- a photolithography technique such as dry etching or wet etching, or a lift-off method can be appropriately used.
- the materials of the piezoelectric thin film 16 include aluminum nitride (A1N), zinc oxide (ZnO), cadmium sulfide (CdS), lead titanate (PT (PbTi ⁇ )), and lead zirconate titanate (PZT (Pb (Zr
- A1N is a high-frequency band where the propagation speed of elastic waves is fast.
- piezoelectric thin film for a piezoelectric thin film device such as a piezoelectric thin film resonator or a piezoelectric thin film filter that operates. Its thickness is, for example, 500-3000 nm.
- a photolithography technique such as dry etching or wet 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 in the same manner as the lower electrode 15.
- Materials for the upper electrode 17 include gold (Au), platinum (Pt), titanium (Ti), aluminum (A1), molybdenum (Mo), tungsten (W), tantalum (Ta), iridium (Ir), Ruthenium (Ru) is preferably used. Further, for reasons such as enhancing the adhesiveness, the force S for laminating the adhesive metal layer located between the metal layer and the piezoelectric thin film 16 can be provided as needed.
- the thickness of the upper electrode 17 including the adhesion layer is, for example, 50500 nm.
- a photolithography technique such as dry etching or wet etching or a lift-off method is appropriately used as in the case of the lower electrode 15.
- the via hole 18 is provided so as to expose a part of the sacrifice layer 13 so that the etchant is favorably introduced.
- the via holes 18 are arranged at the four corners of the sacrificial layer 13.
- the force S is not particularly limited.
- a photolithography technique such as dry etching or wet etching can be appropriately used.
- the vibration space 20 is formed by introducing an etchant from the via hole 18 and etching away the sacrificial layer 13 and the insulating layer 12 disposed thereunder. At this time, depending on the type of the etching liquid and the material of the piezoelectric laminated structure 14, it is necessary to protect portions other than the via holes 18 with a photoresist.
- a photoresist a novolak-based or cyclized rubber-based photoresist can be used as appropriate, depending on the material of the etching solution.
- FIG. 4 is a schematic plan view showing a second embodiment of the piezoelectric thin film device according to the present invention
- FIG. 5 is a sectional view taken along line XX of FIG.
- FIGS. 6 (a) and 6 (e) are explanatory views showing a series of manufacturing steps of the above-described second embodiment along a line XX similar to FIG.
- members having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals.
- a via hole for exposing a portion of the sacrifice layer 13 or the insulating layer 12 located below the sacrifice layer 13 for forming the vibration space 20 is provided on the lower surface side of the substrate 11.
- a dry etching method using sulfur hexafluoride (SF) or the like, a method using SF and C318 (C F) gas are used.
- the Deep RIE method using alternately can be applied.
- the etching time for forming the vibration space 20 is the first time. This is shortened as compared with the embodiment of FIG.
- the etchant reaches the sacrificial layer 13
- the sacrificial layer 13 is instantaneously etched. Therefore, the position of the vibration space 20 is almost limited below the sacrificial layer 13 regardless of the shape of the via hole 18.
- FIG. 7 is a schematic plan view showing a third embodiment of the piezoelectric thin-film device according to the present invention
- FIG. 8 is a sectional view taken along line XX of FIG.
- members having the same functions as those in FIGS. 1 and 2 are denoted by the same reference numerals.
- the etching rate by a specific chemical substance is formed on the region corresponding to the vibration space 20 on the first insulating layer 12.
- a sacrifice layer (similar to the sacrifice layer 13 in the above embodiment) larger than the first insulating layer 12 is formed.
- a second insulating layer 12 ′ made of a different material from the first insulating layer 12 is laminated on the sacrificial layer and the first insulating layer 12.
- a piezoelectric laminated structure 14 including a lower electrode 15, a piezoelectric thin film 16, and an upper electrode 17 is formed.
- a via hole 18 is provided so as to expose a part of the sacrificial layer 13 through the piezoelectric layer 16, the lower electrode 15, and the second insulating layer 12 ', and the sacrificial layer and the insulating layer are etched from the via hole.
- An etchant is introduced. Since the sacrificial layer is selected from a substance having a higher etching rate than the insulating layer 12, the sacrificial layer 13 is first etched away faster than the insulating layer 12, and the etchant is favorably introduced into the voids formed thereby. . Although the etching itself is isotropic, the etching liquid is introduced in a planar manner into the gap from which the sacrifice layer 13 has been removed.
- the portion of the insulating layer 12 located is favorably etched away. Since the etching of the portion of the insulating layer 12 corresponding to the end of the sacrificial layer 13 is isotropic, the force to be further etched in the lateral direction is about the thickness of the insulating layer 13.
- the vibration space 20 is substantially limited to a portion from which the sacrificial layer is removed and a portion of the insulating layer located thereunder.
- a vibration space 20 having a desired shape can be formed by selecting an insulating material whose etching rate by a specific chemical substance is smaller than that of the first insulating layer 12. it can. As described above, in the present invention, the sacrificial layer and the insulating layer are etched by the same etchant (specific chemical substance).
- a nitride mainly containing aluminum nitride or silicon nitride, or an oxynitride-based insulator can be suitably used.
- an insulating layer etched with a specific chemical substance, and an etching rate for the specific chemical substance higher than that of the insulating layer By combining with the sacrificial layer, the insulating layer and the sacrificial layer can be removed by a single etching operation without using a polishing technique such as CMP, and a good space for vibration is formed under the piezoelectric multilayer structure by a simple process. can do.
- a polishing technique such as CMP
- the piezoelectric thin film device manufactured as described above is supported by the substrate, an insulating layer formed on the upper surface of the substrate, a vibration space formed in the insulating layer, and the insulating layer.
- a piezoelectric laminated structure disposed on the vibration space, wherein the piezoelectric laminated structure includes a piezoelectric thin film and electrodes respectively formed on both surfaces thereof, and the vibration space is
- the electromechanical coupling coefficient Kt 2 decreases due to the decrease in the crystal orientation of the piezoelectric thin film itself, and the piezoelectric product decreases. It is preferable because the resonance sharpness Q does not easily decrease as the surface roughness of the layer structure itself increases.
- a surface interval between an upper surface of the insulating layer and a lower surface of the lower electrode in the vibration space is 20 nm to 600 nm, preferably 20 nm to 90 nm.
- the piezoelectric thin film device has a surface interval between the upper surface of the insulating layer and the lower surface of the vibration space of 500 nm to 3000 ⁇ m.
- the piezoelectric thin-film device of the present invention has a favorable vibration space below the piezoelectric laminated structure, and therefore has excellent characteristics and high reliability.
- the piezoelectric thin film device having the structure shown in FIGS.
- a lift-off pattern for a sacrificial layer for forming a vibration space was formed.
- a gas pressure of 0.5 Pa and substrate pressure were applied to the upper surface of the Si wafer by DC magnetron sputtering.
- the sacrificial layer was patterned into a desired shape by applying ultrasonic waves in a resist stripper.
- a photoresist is applied on the upper surface of the Si wafer to form a lift-off pattern for the lower electrode as shown in FIG. 1, and the gas pressure is 0.5 Pa by DC magnetron sputtering and the substrate is not heated.
- a Mo layer of about 300 nm was formed as a lower electrode, and the lower electrode was patterned into a desired shape by applying ultrasonic waves in a resist stripper.
- the total gas pressure was 0.5 Pa
- the gas composition A r / N 1/1
- the substrate temperature was 300 ° C.
- the A1N piezoelectric thin film was patterned into a predetermined shape as shown in FIG. 1 by wet etching using heated phosphoric acid. Subsequently, a photoresist was applied, the resist was patterned into a predetermined shape using a photomask for the upper electrode, and a Mo layer having a thickness of about 300 nm was formed as an upper electrode by a DC magnetron sputtering method. Further, the upper electrode was patterned into the shape shown in FIG. 1 by applying ultrasonic waves in a resist stripping solution. Next, as shown in Fig. 1 by dry etching using a mixed gas of C1 and Ar.
- the photoresist is immersed in a buffer solution to remove the photoresist, and the sacrificial layer and the insulating layer below the sacrificial layer are removed by etching.
- piezoelectric thin film device piezoelectric thin film resonator
- This defect is mainly caused by cracks at the edges of the piezoelectric laminated structure, peeling of part of the lower electrode due to an increase in the lateral etching amount of the insulating layer corresponding to the edges of the sacrificial layer, and Structure This is caused by a part of the structure physically contacting the substrate.
- a piezoelectric thin film device (piezoelectric thin film resonator) having the structure shown in FIG. 12 was manufactured as follows. That is, the piezoelectric thin-film resonator shown in FIG. 12 was produced in the same manner as in Example 1 except that the thickness of the insulating layer was set to 100 nm.
- a piezoelectric thin film device having the structure shown in FIGS.
- piezoelectric thin film resonator (Piezoelectric thin film resonator) was produced. That is, the piezoelectric thin-film resonator shown in FIG. 12 was manufactured in the same manner as in Example 1 except that the insulating layer was formed by the CVD method and the thickness of the insulating layer was 3000 nm.
- a piezoelectric thin film device having the structure shown in FIGS. 1 and 2 was manufactured as follows. That is, the piezoelectric thin-film resonators shown in FIGS. 1 and 2 were produced in the same manner as in Example 1 except that the thickness of the insulating layer was changed to 500 nm.
- a piezoelectric thin film device (piezoelectric thin film resonator) having the structure shown in FIGS. 1 and 2 was manufactured as follows. That is, except that the thickness of the sacrificial layer was changed to 20 nm, the piezoelectric thin film resonator shown in FIGS.
- a piezoelectric thin film device having the structure shown in FIGS. 1 and 2 was manufactured as follows. That is, the piezoelectric thin-film resonator shown in FIGS. 1 and 2 was produced in the same manner as in Example 1 except that the thickness of the sacrificial layer was 90 nm.
- the piezoelectric thin film device having the structure shown in FIGS. (Piezoelectric thin film resonator) was produced. That is, the piezoelectric thin-film resonators shown in FIGS. 1 and 2 were produced in the same manner as in Example 1 except that the thickness of the sacrificial layer was set to 500 nm.
- a piezoelectric thin film device (piezoelectric thin film resonator) having the structure shown in FIGS. 1 and 2 was manufactured as follows. That is, except that the thickness of the sacrificial layer was set to 600 nm, the piezoelectric thin-film resonator shown in FIGS.
- a piezoelectric thin film device having the structure shown in FIGS. 1 and 2 was manufactured as follows. That is, FIGS. 1 and 2 are the same as those shown in Example 1 except that the insulating layer was formed by a CVD method, the material of the insulating layer was PSG (phosphorus-doped silicate glass), and the thickness of the insulating layer was 3000 nm. Were fabricated.
- a piezoelectric thin film device having the structure shown in FIGS. 1 and 2 was manufactured as follows.
- Example 1 is the same as Example 1 except that the insulating layer was formed by the CVD method, the material of the insulating layer was BPSG (phosphorus boron-doped silicate glass), the thickness of the insulating layer was 2500 nm, and the thickness of the sacrificial layer was 500 nm.
- the piezoelectric thin film shown in Figs. A film resonator was manufactured.
- the piezoelectric thin film device having the structure shown in FIGS.
- An A1N insulating layer of 500 nm was formed.
- a photoresist was applied to the upper surface of the Si wafer to form a lift-off pattern for the sacrificial layer as shown in FIG.
- An A1 layer having a thickness of 50 nm was formed as a sacrificial layer on the upper surface of the Si wafer by DC magnetron sputtering under a gas pressure of 0.5 Pa and no substrate heating, and then ultrasonic waves were applied in a resist stripper. Thereby, the sacrificial layer was patterned into a desired shape.
- a photoresist is applied to the upper surface of the Si wafer to form a lift-off pattern for the lower electrode as shown in FIG.
- An A1N piezoelectric thin film with a thickness of about 1500 nm was formed at a plate temperature of 300 ° C.
- the A1N piezoelectric thin film was patterned into a predetermined shape as shown in FIG. 1 by wet etching using heated phosphoric acid.
- a photoresist was applied, the resist was patterned into a predetermined shape using a photomask for the upper electrode, and a Mo layer having a thickness of about 300 nm was formed as an upper electrode by DC magnetron sputtering.
- the upper electrode was patterned into a shape as shown in FIG.
- via holes were formed as shown in FIG. 1 by a dry etching method using a mixed gas of C12 and Ar.
- immerse in hot phosphoric acid without stripping the photoresist, After etching off the A1N insulating layer located below the layer,
- piezoelectric thin film device piezoelectric thin film resonator
- a piezoelectric thin film device (piezoelectric thin film resonator) having the structure shown in FIGS. 1 and 2 was manufactured as follows. That is, except that the thickness of the sacrificial layer was set to 500 nm, a piezoelectric thin-film resonator shown in FIGS.
- a piezoelectric thin film device having the structure shown in FIGS.
- a 500-nm-thick Si layer was formed on both sides of a 300- ⁇ m-thick 6-inch Si wafer by thermal oxidation, and a photoresist was applied to the upper surface of the Si wafer. As shown
- a lift-off pattern for a sacrificial layer for forming a working space was formed.
- a 50 nm Ti layer is formed as a sacrificial layer on the upper surface of this Si wafer by DC magnetron sputtering under a gas pressure of 0.5 Pa and no substrate heating, and then ultrasonic waves are applied in a resist stripper.
- the sacrificial layer was patterned into a desired shape.
- a photoresist is applied to the upper surface of the Si wafer to form a lift-off pattern for the lower electrode as shown in FIG. 4, and a DC magnetron sputtering method is used under the conditions of 0.5 Pa gas pressure and no substrate heating.
- an A1N piezoelectric thin film having a thickness of about 1500 nm was formed.
- the A1N piezoelectric thin film was patterned into the predetermined shape shown in FIG. 4 by wet etching using heated phosphoric acid.
- a photoresist was applied and the resist was patterned into a predetermined shape, and then a Mo layer having a thickness of about 300 nm was formed as an upper electrode by DC magnetron sputtering.
- the upper electrode was patterned into the shape shown in Fig. 4 by applying ultrasonic waves in the resist stripping solution.
- a photoresist is applied to both surfaces of the wafer, a pattern for forming a via hole as shown in FIG. 4 is formed on the lower surface of the wafer, and the thermal oxide film on the lower surface of the wafer is patterned by dipping in a hydrofluoric acid buffer solution. . Furthermore, via holes were formed by etching the Si wafer by Deep RIE using SF6 and C4F8 gases alternately until the insulating layer (thermal oxide film) formed on the upper surface of the wafer was exposed. Next, the photoresist was immersed in a buffer solution to remove the photoresist, and the sacrificial layer and the insulating layer located below the sacrificial layer were removed by etching.
- piezoelectric thin film device piezoelectric thin film resonator
- a piezoelectric thin film device (piezoelectric thin film resonator) having the structure shown in FIGS. 4 and 5 was manufactured as follows. That is, the piezoelectric thin-film resonators shown in FIGS. 4 and 5 were produced in the same manner as in Embodiment 13 except that the thickness of the insulating layer was set to 2000 nm.
- the piezoelectric thin film device having the structure shown in FIGS.
- An A1N second insulating layer having a thickness of 300 nm was formed at a plate temperature of 300 ° C. Further, a photoresist is applied on the upper surface of the A1N second insulating layer to form a lift-off pattern for the lower electrode as shown in FIG. 7, and the gas pressure is 0.5 Pa by DC magnetron sputtering and the substrate is not heated. Under these conditions, a Mo layer of about 300 nm was formed as a lower electrode, and the lower electrode was patterned into a desired shape by applying ultrasonic waves in a resist stripper.
- A1N piezoelectric thin film of OOnm was formed. Subsequently, the A1N piezoelectric thin film was patterned into a predetermined shape shown in FIG. 7 by wet etching using heated phosphoric acid. Next, apply a photoresist, use a photomask for the upper electrode, pattern the resist into a predetermined shape, and form a Mo layer with a thickness of about 300 nm as the upper electrode by DC magnetron sputtering. did. By applying ultrasonic waves in the resist stripper, the upper electrode was patterned into the shape shown in FIG. Then, via holes as shown in FIG. 7 were formed by dry etching using a mixed gas of C12 and Ar. Next, the photoresist is immersed in a buffer solution to remove the photoresist, and the sacrificial layer and the SiO insulating layer located below the sacrificial layer are etched.
- piezoelectric thin film device piezoelectric thin film resonator
- a piezoelectric thin film device having the structure shown in FIGS. 1 and 2 was manufactured as follows. That is, the piezoelectric thin-film resonator shown in FIGS. 1 and 2 was produced in the same manner as in Example 1 except that the force did not form a sacrificial layer. However, even if the etching treatment was performed for a long time, a vibration space could not be formed below the piezoelectric laminated structure, and the electrical characteristics could not be evaluated at all.
- 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. 1.
- FIG. 3 is an explanatory view showing a cross-sectional view of a manufacturing process of the piezoelectric thin film device shown in FIGS. 1 and 2.
- FIG. 4 is a schematic plan view showing an embodiment of a piezoelectric thin film device (piezoelectric thin film resonator) according to the present invention.
- FIG. 5 is a sectional view taken along line XX of FIG. 4.
- FIG. 6 is an explanatory view showing a cross-sectional view of a manufacturing process of the piezoelectric thin-film device shown in FIGS. 4 and 5.
- FIG. 7 is a schematic plan view showing an embodiment of a piezoelectric thin film device (piezoelectric thin film resonator) according to the present invention.
- FIG. 8 is a sectional view taken along line XX of FIG. 7.
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US10/538,137 US7212082B2 (en) | 2003-12-19 | 2004-12-17 | Method of manufacturing piezoelectric thin film device and piezoelectric thin film device |
JP2005516357A JP4534158B2 (ja) | 2003-12-19 | 2004-12-17 | 圧電薄膜デバイスの製造方法 |
EP04807248A EP1701440A4 (en) | 2003-12-19 | 2004-12-17 | THIN-FILM PIEZOELECTRIC DEVICE AND METHOD OF MANUFACTURE |
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JP4687345B2 (ja) * | 2005-09-09 | 2011-05-25 | ソニー株式会社 | 薄膜バルク音響共振器 |
JP2007074609A (ja) * | 2005-09-09 | 2007-03-22 | Sony Corp | 薄膜バルク音響共振器 |
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JPWO2007119643A1 (ja) * | 2006-03-31 | 2009-08-27 | 宇部興産株式会社 | 圧電薄膜共振子、圧電薄膜デバイスおよびその製造方法 |
JP4688070B2 (ja) * | 2006-03-31 | 2011-05-25 | 宇部興産株式会社 | 圧電薄膜共振子、圧電薄膜デバイスおよびその製造方法 |
JP2008022305A (ja) * | 2006-07-13 | 2008-01-31 | Ube Ind Ltd | 薄膜圧電共振器およびその製造方法 |
JP2010041153A (ja) * | 2008-07-31 | 2010-02-18 | Kyocera Corp | 圧電共振器およびその製造方法 |
JP2010141570A (ja) * | 2008-12-11 | 2010-06-24 | Ube Ind Ltd | 圧電薄膜音響共振器およびその製造方法 |
DE112010000688T5 (de) | 2009-01-29 | 2012-11-15 | Murata Manufacturing Co. Ltd. | Verfahren zur Herstellung elnes Verbundsubstrats |
DE112010000688B4 (de) | 2009-01-29 | 2018-08-02 | Murata Manufacturing Co., Ltd. | Verfahren zur Herstellung elnes Verbundsubstrats |
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JP2010232983A (ja) * | 2009-03-27 | 2010-10-14 | Nippon Telegr & Teleph Corp <Ntt> | 薄膜振動子およびその製造方法 |
JPWO2012144305A1 (ja) * | 2011-04-18 | 2014-07-28 | コニカミノルタ株式会社 | 圧電アクチュエータおよびそれを備えたインクジェットヘッド |
JP5582251B2 (ja) * | 2011-04-18 | 2014-09-03 | コニカミノルタ株式会社 | 圧電アクチュエータおよびそれを備えたインクジェットヘッド |
US8979249B2 (en) | 2011-04-18 | 2015-03-17 | Konica Minolta, Inc. | Piezoelectric actuator and ink-jet head including same |
WO2012144305A1 (ja) * | 2011-04-18 | 2012-10-26 | コニカミノルタホールディングス株式会社 | 圧電アクチュエータおよびそれを備えたインクジェットヘッド |
WO2015190429A1 (ja) * | 2014-06-13 | 2015-12-17 | 株式会社村田製作所 | 圧電デバイスおよび圧電デバイスの製造方法 |
JPWO2015190429A1 (ja) * | 2014-06-13 | 2017-04-20 | 株式会社村田製作所 | 圧電デバイスおよび圧電デバイスの製造方法 |
JP2018085651A (ja) * | 2016-11-24 | 2018-05-31 | 太陽誘電株式会社 | 圧電薄膜共振器、フィルタおよびマルチプレクサ |
US11075614B2 (en) | 2016-11-24 | 2021-07-27 | Taiyo Yuden Co., Ltd. | Piezoelectric thin film resonator, filter, and multiplexer |
JP2018110379A (ja) * | 2017-01-03 | 2018-07-12 | 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響波共振装置の製造方法 |
WO2022230288A1 (ja) * | 2021-04-28 | 2022-11-03 | 株式会社村田製作所 | 弾性波装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1701440A4 (en) | 2008-09-24 |
CN100546178C (zh) | 2009-09-30 |
US20060033595A1 (en) | 2006-02-16 |
US7212082B2 (en) | 2007-05-01 |
JP4534158B2 (ja) | 2010-09-01 |
CN1894849A (zh) | 2007-01-10 |
JPWO2005060091A1 (ja) | 2007-07-12 |
EP1701440A1 (en) | 2006-09-13 |
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