WO2011013553A1 - 複合基板及びその製造方法 - Google Patents
複合基板及びその製造方法 Download PDFInfo
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- WO2011013553A1 WO2011013553A1 PCT/JP2010/062238 JP2010062238W WO2011013553A1 WO 2011013553 A1 WO2011013553 A1 WO 2011013553A1 JP 2010062238 W JP2010062238 W JP 2010062238W WO 2011013553 A1 WO2011013553 A1 WO 2011013553A1
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- substrate
- piezoelectric substrate
- piezoelectric
- composite
- outer peripheral
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
- H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
- H03H3/08—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of resonators or networks using surface acoustic waves
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- 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
- H10N30/072—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by laminating or bonding of piezoelectric or electrostrictive bodies
- H10N30/073—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by laminating or bonding of piezoelectric or electrostrictive bodies by fusion of metals or by adhesives
-
- 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
- H10N30/08—Shaping or machining of piezoelectric or electrostrictive bodies
- H10N30/085—Shaping or machining of piezoelectric or electrostrictive bodies by machining
- H10N30/086—Shaping or machining of piezoelectric or electrostrictive bodies by machining by polishing or grinding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/42—Piezoelectric device making
Definitions
- the present invention relates to a composite substrate and a manufacturing method thereof.
- an electrode is provided on a composite substrate obtained by bonding a support substrate and a piezoelectric substrate to produce an acoustic wave element.
- the acoustic wave element is used, for example, as a band-pass filter in a communication device such as a mobile phone.
- a composite substrate using lithium niobate or lithium tantalate as a piezoelectric substrate and silicon or quartz as a supporting substrate is known (see Patent Document 1).
- such a composite substrate is often manufactured by preparing a piezoelectric substrate and a support substrate, bonding these substrates with an organic adhesive layer interposed therebetween, and then reducing the thickness of the piezoelectric substrate.
- the piezoelectric substrate is usually chamfered.
- polishing abrasive grains are interposed between the surface of the piezoelectric substrate and the polishing surface plate, and the surface of the piezoelectric substrate is polished by the polishing surface plate.
- the edge portion when the piezoelectric substrate and the support substrate are bonded together, the edge portion may be in a state where the organic adhesive layer does not come to the chamfered portion.
- the surface of the piezoelectric substrate is polished with a polishing surface plate in this state, there is a problem that a lot of chips are generated starting from the edge portion.
- a process involving heating may be performed after polishing. At this time, cracks and the like may occur at the end of the piezoelectric substrate due to the expansion and contraction due to heating.
- the present invention has been made in view of the above-described problems, and in the case where a piezoelectric substrate and a support substrate are bonded together through an adhesive layer, a composite substrate that can further suppress the occurrence of defects at the end portions, and
- the main purpose is to provide a manufacturing method thereof.
- the composite substrate of the present invention is A support substrate; A piezoelectric substrate; An adhesive layer that bonds the support substrate and the piezoelectric substrate; When the surface of the piezoelectric substrate that is bonded to the support substrate is the first surface and the surface opposite to the first surface is the second surface, the first surface is relative to the second surface. A bulging portion is formed on the piezoelectric substrate so that the first surface enters the inside of the second surface when projected onto the second surface in the vertical direction. It has a continuous outer peripheral surface from the piezoelectric substrate through the adhesive layer to the support substrate.
- the method for producing the composite substrate of the present invention comprises: (A) preparing a support substrate and a piezoelectric substrate with chamfered corners; (B) forming a bonded substrate by bonding the bonding portion on the surface of the support substrate and the back surface of the piezoelectric substrate via an adhesive layer; (C) by grinding the outer peripheral surface of the bonded substrate, interposing abrasive grains between the surface of the piezoelectric substrate and a polishing surface plate, and polishing the surface of the piezoelectric substrate with the polishing surface plate.
- step (c) when the surface of the piezoelectric substrate bonded to the support substrate is a first surface and the surface opposite to the first surface is a second surface, the first surface When the projection is projected onto the second surface in a direction perpendicular to the second surface, a bulge is formed in the piezoelectric substrate so that the first surface enters the inside of the second surface, and the piezoelectric substrate
- the bonded substrate is processed so as to form a continuous outer peripheral surface from the adhesive layer to the support substrate.
- the first surface is the second surface.
- the projection is projected onto the second surface in a direction perpendicular to the first surface, a bulging portion is formed on the piezoelectric substrate so that the first surface is inside the second surface.
- a continuous outer peripheral surface is formed from the piezoelectric substrate to the support substrate through the adhesive layer.
- the second surface that is not adhered is formed larger than the first surface that is adhered to the support substrate by the adhesive layer, and the volume on the second surface side having a high degree of freedom is high. Is relatively large. Due to the presence of the bulging portion, it is presumed that the stress at the end caused by the expansion / contraction of the support substrate and the piezoelectric substrate, such as when heated, can be relieved. Moreover, since the continuous outer peripheral surface is formed, the malfunction in the outer peripheral surface bonded together can be reduced more.
- FIG. 1 is a configuration diagram showing an outline of the configuration of a composite substrate 10.
- FIG. 3 is a cross-sectional view schematically showing an example of a manufacturing process for the composite substrate 10.
- FIG. FIG. 4 is a partial cross-sectional view taken along line A-A ′ showing how the grinding wheel 34 moves when grinding the outer peripheral surface of the bonded substrate 20 before polishing.
- Sectional drawing which shows the outline of a structure of the composite substrate 10B.
- Sectional drawing which shows the outline of a structure of 10 C of composite substrates.
- Sectional drawing which shows the outline of a structure of the composite substrate 10F.
- Sectional drawing which shows the outline of a structure of composite substrate 10G.
- Sectional drawing which shows the outline of a structure of the composite substrate 110 of the comparative example 1.
- FIG. The schematic diagram of the composite substrate of Example 1 and the comparative example 1 after heat processing.
- FIG. 1 is a configuration diagram showing an outline of the configuration of a composite substrate 10 according to an embodiment of the present invention.
- the composite substrate 10 of the present invention is configured by bonding a plurality of substrates.
- the composite substrate 10 includes a support substrate 12, a piezoelectric substrate 14, and an adhesive layer 19 that adheres the support substrate 12 and the piezoelectric substrate 14.
- the composite substrate 10 has a first surface when a surface of the piezoelectric substrate 14 bonded to the support substrate 12 is a first surface 15 and a surface opposite to the first surface 15 is a second surface 16.
- the composite substrate 10 of the present invention has a continuous outer peripheral surface from the piezoelectric substrate 14 through the adhesive layer 19 to the support substrate 12. Further, the composite substrate 10 is formed in a circular shape in which one place is flat. This flat portion is a portion called an orientation flat (OF), and is used, for example, when detecting the wafer position and direction when performing various operations in the manufacturing process of the surface acoustic wave device.
- OF orientation flat
- the support substrate 12 is a substrate that supports the piezoelectric substrate 14 by adhering the piezoelectric substrate 14 to the adhesive surface 11 that is the upper surface thereof.
- Examples of the material of the support substrate 12 include silicon, sapphire, aluminum nitride, alumina, borosilicate glass, quartz glass, lithium tantalate, lithium niobate, lithium niobate-lithium tantalate solid solution single crystal, lithium borate, and Langa. Site, crystal, etc.
- a constricted portion 13 having a smaller outer periphery than the adhesive surface 11 is formed between the adhesive surface 11, which is the upper surface, and the lower surface.
- the constricted portion 13 projects the cross section of the constricted portion 13 (a cross section parallel to the adhesive surface 11) onto the adhesive surface 11 in a direction perpendicular to the adhesive surface 11, and this cross section enters the inside of the adhesive surface 11. It is formed in such a shape.
- the support substrate 12 may have a thermal expansion coefficient different from that of the piezoelectric substrate 14, and preferably has a smaller thermal expansion coefficient than the piezoelectric substrate 14.
- the support substrate 12 may have a difference in thermal expansion coefficient from the piezoelectric substrate 14 of 5 ppm / ° C. or more. Even if the difference in thermal expansion coefficient is 5 ppm / ° C.
- the shape of the piezoelectric substrate 14 can suppress the occurrence of cracks and chipping at the end of the piezoelectric substrate 14.
- the support substrate 12 preferably has a thermal expansion coefficient of 2 to 7 ppm / ° C. when the piezoelectric substrate 14 has a thermal expansion coefficient of 13 to 20 ppm / ° C.
- Table 1 shows thermal expansion coefficients of typical materials used for the piezoelectric substrate 14 and the support substrate 12 of the composite substrate 10.
- the adhesive layer 19 is a layer that bonds the support substrate 12 and the piezoelectric substrate 14 together.
- the material of the adhesive layer 19 is not particularly limited, but an organic adhesive having heat resistance is preferable, and examples thereof include an epoxy adhesive and an acrylic adhesive.
- the adhesive layer 19 is formed so that the outer periphery increases from the support substrate 12 side toward the piezoelectric substrate 14 side.
- the piezoelectric substrate 14 may be a substrate capable of propagating elastic waves (particularly, surface acoustic waves).
- Examples of the material of the piezoelectric substrate 14 include lithium tantalate, lithium niobate, lithium niobate-lithium tantalate solid solution single crystal, lithium borate, langasite, and quartz.
- a surface (lower surface) bonded to the support substrate 12 is a first surface 15, and a surface (upper surface) opposite to the first surface 15 is a second surface 16.
- a bulging portion 14 a is formed such that the first surface 15 enters the inside of the second surface 16.
- the piezoelectric substrate 14 is formed with an outer peripheral surface 17 whose outer periphery increases from the first surface 15 toward the second surface 16.
- the first surface 15 is a surface that contributes to adhesion with the support substrate 12.
- the piezoelectric substrate 14 is perpendicular to the second surface 16 and passes through the center of the composite substrate 10, and a tangent line from the first surface 15 toward the bulging portion 14 a of the piezoelectric substrate 14 and the first surface 15.
- the outer peripheral surface 17 is formed so that the angle ⁇ formed with the extension line is an acute angle.
- the center of the composite substrate 10 may be, for example, the center of the outer shape excluding the OF portion (see FIG. 1).
- This angle ⁇ is less than 90 °, preferably more than 0 °, and preferably 70 °. More preferably, it is 20 ° or more. When the angle ⁇ is 70 ° or less and 20 ° or more, it is preferable because the mechanical strength at the end of the piezoelectric substrate 14 can be further secured.
- the piezoelectric substrate 14 having a thermal expansion coefficient of 13 to 20 ppm / ° C. can be used.
- the composite substrate 10 may be used for an acoustic wave device.
- the acoustic wave device include a surface acoustic wave device, a Lamb wave element, and a thin film resonator (FBAR).
- a surface acoustic wave device includes an input-side IDT (Interdigital-Transducer) electrode (also referred to as a comb-shaped electrode or an interdigital electrode) that excites surface acoustic waves on the surface of a piezoelectric substrate and an output-side IDT that receives surface acoustic waves. And an electrode.
- IDT Interdigital-Transducer
- the acoustic wave device using the composite substrate 10 of the present invention can relieve stress due to thermal expansion and the like, and defects such as cracks and chips at the ends of the piezoelectric substrate 14, the adhesive layer 19, the support substrate 12, and the like occur. Can be suppressed.
- FIG. 2 is a cross-sectional view schematically showing an example of the manufacturing process of the composite substrate 10.
- FIG. 3 is an explanatory diagram showing an outline of the configuration of the grinding device 30.
- FIG. 4 is a partial cross-sectional view taken along the line A-A ′ showing how the grinding wheel 34 moves when the outer peripheral surface of the bonded substrate 20 before polishing is ground.
- the manufacturing method of the composite substrate 10 includes: (a) a step of preparing a support substrate and a piezoelectric substrate with chamfered corners; (b) a step of bonding the support substrate and the piezoelectric substrate to form a bonded substrate; (C) grinding the outer peripheral surface of the bonded substrate to reduce the thickness of the piezoelectric substrate, and mirror-polishing the surface of the piezoelectric substrate.
- those before grinding are referred to as a support substrate 22, a piezoelectric substrate 24, and an adhesive layer 29, respectively.
- a support substrate 22 and a piezoelectric substrate 24 that is capable of propagating elastic waves and has chamfered corners are prepared (FIG. 2A).
- the support substrate 22 and the piezoelectric substrate 24 the materials described above can be used.
- the size of the support substrate 22 is not particularly limited.
- the diameter is 50 to 150 mm and the thickness is 250 to 500 ⁇ m.
- the support substrate 22 may have chamfered corners in advance.
- the size of the piezoelectric substrate 24 is not particularly limited.
- the diameter can be 50 to 150 mm and the thickness can be 250 to 500 ⁇ m.
- the chamfering may be a C chamfer in which an intersection (ridge) between two surfaces is cut at a predetermined angle, or an R chamfer cut so that the ridge has a predetermined radius of curvature. It may be.
- a metal or silicon dioxide layer having a thickness of 0.1 to 5 ⁇ m may be provided on the back surface of the piezoelectric substrate.
- the bonding substrate 20 is formed by bonding the bonding surface 21 that is the upper surface of the support substrate 22 and the first surface 25 that is the back surface of the piezoelectric substrate 24 through the bonding layer 29.
- an adhesive is uniformly applied to one or both of the adhesive surface 21 and the first surface 25, and the bonded substrate 20 is formed by solidifying the adhesive in a state in which both are overlapped (FIG. 2B).
- the adhesive is preferably an organic adhesive having heat resistance, and for example, an epoxy adhesive or an acrylic adhesive is preferably used. Examples of the method for applying the organic adhesive include spin coating and printing.
- the thickness of the adhesive layer formed by heating is preferably 0.1 ⁇ m or more and 1.0 ⁇ m or less. .
- the thickness of the adhesive layer is 1.0 ⁇ m or less, it is possible to obtain the effect of suppressing the change of the frequency characteristic with respect to the temperature change. An effect of suppressing changes in frequency characteristics can be obtained.
- step (c) the outer peripheral surface of the bonded substrate is ground to reduce the thickness of the piezoelectric substrate, and the surface of the piezoelectric substrate is mirror-polished (FIG. 2 (c)). Specifically, in this step (c), the outer peripheral surface of the bonded substrate is ground so as to form a continuous outer peripheral surface from the piezoelectric substrate through the adhesive layer to the support substrate. At this time, a continuous outer peripheral surface from the piezoelectric substrate to the support substrate may be formed on at least a part of the outer peripheral surface of the composite substrate 10.
- the surface of the piezoelectric substrate bonded to the support substrate is the first surface 25, and the surface opposite to the first surface after the thickness of the piezoelectric substrate 14 is reduced is the second surface.
- the piezoelectric substrate 14 When the first surface 25 is projected onto the second surface 16 in a direction perpendicular to the second surface 16 when the surface 16 is used, the piezoelectric substrate 14 swells so that the first surface 25 enters the second surface 16. A protruding portion 14a is formed.
- the outer peripheral surface 27 whose outer periphery becomes larger from the adhesive surface 21 of the support substrate 22 toward the upper surface 26 of the piezoelectric substrate 24 may be produced by grinding. In this way, the piezoelectric substrate 14 having an area larger than the bonding surface 11 of the support substrate 12 is formed above the stress, and the stress at the outer peripheral end of the composite substrate 10 can be relieved.
- the piezoelectric substrate 24 and the adhesive layer 29 are ground so as to form the constricted portion 13 on the support substrate 12, and It is preferable to grind partly.
- the outer peripheral portion of the adhesive layer 29 where an unbonded portion is likely to be generated can be sufficiently ground, and peeling on the outer peripheral side of the adhesive layer can be more easily suppressed.
- a tangent line from the first surface 25 toward the bulging portion 14 a of the piezoelectric substrate 14 and an extension line of the first surface 25 are formed.
- the bonded substrate may be processed so that the angle ⁇ is an acute angle.
- This angle ⁇ is less than 90 °, preferably more than 0 °, and more preferably 70 ° or less and 20 ° or more.
- the angle ⁇ is 70 ° or less and 20 ° or more, it is preferable because the mechanical strength at the end of the piezoelectric substrate 14 can be further secured.
- the bonded substrate is preferably processed so that the chamfered portion of the piezoelectric substrate is eliminated.
- the bonded substrate may be ground so that at least the chamfered portion of the piezoelectric substrate on the adhesive layer 29 side is eliminated.
- step (c) grinding may be performed so that the initial outer diameter of the support substrate is maintained. By doing so, it is possible to use an apparatus, a jig, or the like that conforms to the same outer diameter standard before and after performing step (c).
- the grinding wheel portion 38 of the grinding wheel 34 that also rotates is brought into contact with the outer peripheral surface of the bonded substrate 20 that rotates.
- a grinding device 30 can be used.
- the outer peripheral surface of the rotating bonded substrate is brought into contact with a grinding wheel that is not rotating, and the grinding wheel of a grinding wheel that rotates and revolves around the bonded substrate is brought into contact with the outer peripheral surface of the bonded substrate. It is also possible to use a grinding device.
- the grinding device 30 includes a grinding mechanism that horizontally grinds the grinding wheel 34 whose height has been adjusted in advance, and presses the grinding wheel portion 38 of the grinding wheel 34 against the outer peripheral surface of the bonded substrate 20 for grinding. Yes.
- the bonded substrate 20 is held on the rotation holding base 32 by the vacuum suction method with the support substrate 12 facing down, and the bonded substrate 20 rotates in the same direction as the grinding wheel 34.
- the grindstone portion 28 is a ring-shaped member in which a triangle is formed at the end on the outer peripheral side of the rectangle when viewed in cross section, and is fixed to the upper side surface of the grindstone main body 36.
- the dotted line in FIG. 4 represents the position of the grinding wheel 34 when the grinding wheel 34 is moved horizontally to finish grinding.
- step (c) the abrasive grains are interposed between the surface of the piezoelectric substrate 24 and the polishing surface plate, and the upper surface 26 of the piezoelectric substrate 24 is polished by the polishing surface plate to reduce the thickness of the piezoelectric substrate 24.
- the surface of the piezoelectric substrate 24 is mirror-polished (FIG. 2C).
- a general polishing machine can be mentioned. For example, in a polishing machine that polishes one side of the bonded substrate 20, first, the bonded substrate 20 to be polished is pressed between the pressure plate and the polishing platen, and the bonded substrate 20 and the polishing platen are bonded.
- the piezoelectric substrate 24 is thinned by applying a rotational motion to the pressure plate while supplying a slurry containing abrasive grains therebetween. Subsequently, the surface of the piezoelectric substrate 24 is changed by giving the polishing plate a pad with the surface and changing the abrasive grains to a higher one and giving the pressure plate rotation and revolution. Mirror finish. In the bonded substrate 20 provided in this step (c), the edge portion of the piezoelectric substrate 24 is not separated from the adhesive layer 29.
- the edge portion of the piezoelectric substrate 24 is less likely to be chipped.
- the composite substrate 10 shown in FIG. 1 can be manufactured.
- the piezoelectric substrate 14 is formed so that the first surface 15 enters the inside of the second surface 16 when the first surface 15 is projected onto the second surface 16 in a direction perpendicular to the second surface 16.
- the support substrate 12 is formed so that the adhesive surface 11 enters the inside of the second surface 16 when the adhesive surface 11 is projected onto the second surface 16 in a direction perpendicular to the second surface 16.
- the piezoelectric substrate 14 having a larger outer periphery than the adhesion surface 11 is formed above the adhesion surface 11 of the support substrate 12.
- the influence of expansion / contraction due to heating in the subsequent steps It is possible to further suppress the occurrence of cracks and the like at the end of the composite substrate 10 that can be caused by the above.
- the piezoelectric substrate 14 larger than the joint portion 11 of the support substrate 12 is formed above, and the end portion caused by the expansion / contraction of the support substrate 12 or the piezoelectric substrate 14 when heated or the like. This is probably because the stress can be relaxed.
- the step (c) since the outer peripheral surface of the piezoelectric substrate 14 has no chamfered portion, the edge of the piezoelectric substrate 14 is not separated from the adhesive layer 19, and the edge of the piezoelectric substrate 14 is not chamfered.
- Chipping is less likely to occur compared to the case where the adhesive layer 19 is separated.
- the reason for this is that when the edge of the piezoelectric substrate 14 is separated from the adhesive layer 19, when the surface of the piezoelectric substrate 14 is polished, the edge becomes a sharp edge in the thickness direction of the piezoelectric substrate 14 during polishing. This is considered to be due to the fact that the chipping is less likely to occur when the edge of the piezoelectric substrate 14 is not separated from the adhesive layer 19 while it is easily chipped due to the working force. Therefore, it is possible to further suppress the occurrence of defects at the end of the composite substrate.
- the outer peripheral surface 17 is formed so that the outer periphery becomes larger from the first surface 15 toward the second surface 16, but the upper surface of the piezoelectric substrate is chamfered as shown in FIG.
- the composite substrate 10B may be used.
- the first surface 15B is projected onto the second surface 16B in a direction perpendicular to the second surface 16B, the first surface 15B enters the inside of the second surface 16B.
- the piezoelectric substrate 14B is formed.
- the piezoelectric substrate 14B is formed with a protrusion 17a having a larger outer periphery than the second surface 16B between the second surface 16B as the upper surface and the first surface 15B as the lower surface.
- the projecting portion 17a projects a cross section of the projecting portion 17a (a cross section parallel to the first surface 15) onto the second surface 16B in a direction perpendicular to the second surface 16B. It is formed in a shape that fits inside. Even in this case, the second surface 16B that is not bonded is formed larger than the first surface 15B that is bonded to the support substrate 12 by the adhesive layer 19, and the occurrence of defects at the end portion is further increased. Can be suppressed.
- a linear outer peripheral surface is formed when viewed in cross section, but as shown in FIG. 6, a composite substrate 10C that forms a curved outer peripheral surface when viewed in cross section may be used.
- the support substrate 12C is formed so that the outer peripheral surface of the support substrate 12C rises substantially vertically from the constricted portion 13C toward the bonding surface 11C and then gradually inclines outward.
- the piezoelectric substrate 14C is formed on the outer peripheral surface of the composite substrate 10C so that the outward inclination becomes substantially vertical as it goes from the first surface 15C to the second surface 16C.
- the composite substrate 10C also has a continuous outer peripheral surface from the piezoelectric substrate 14C through the adhesive layer 19 to the support substrate 12C.
- the first surface 15C when the first surface 15C is projected onto the second surface 16C in a direction perpendicular to the second surface 16C, the first surface 15C is formed so as to be inside the second surface 16C. The occurrence of defects at the end can be further suppressed.
- the constricted portion 13 is formed on the support substrate 12.
- a composite substrate 10D including a support substrate 12D in which the constricted portion is not formed may be used.
- This composite substrate 10D also has a continuous outer peripheral surface from the piezoelectric substrate 14 through the adhesive layer 19 to the support substrate 12D.
- the first surface 15 is projected onto the second surface 16 in a direction perpendicular to the second surface 16, the first surface 15 is formed so as to enter the inside of the second surface 16. The occurrence of defects at the end can be further suppressed.
- the constricted portion 13 of the support substrate 12 is formed with a surface parallel to the adhesive surface 11, but as shown in FIG. It is good also as the composite substrate 10E provided with the support substrate 12E in which the inclined surface is formed.
- This composite substrate 10E also has a continuous outer peripheral surface from the piezoelectric substrate 14 through the adhesive layer 19 to the support substrate 12E. Also in this composite substrate 10E, when the first surface 15 is projected onto the second surface 16 in a direction perpendicular to the second surface 16, the first surface 15 is formed so as to enter the inside of the second surface 16, The occurrence of defects at the end can be further suppressed.
- the constricted portion 13 is formed on the support substrate 12.
- the constricted portion 13F may be a composite substrate 10F formed on the piezoelectric substrate 14F.
- the composite substrate 10F when the piezoelectric substrate 14F projects a cross section 13a parallel to the first surface 15F onto the first surface 15F in a direction perpendicular to the first surface 15F, the cross section 13a is inside the first surface 15F.
- a constricted portion 13F is formed.
- This composite substrate 10F also has a continuous outer peripheral surface from the piezoelectric substrate 14F through the adhesive layer 19 to the support substrate 12F.
- the first surface 15F when the first surface 15F is projected onto the second surface 16F in a direction perpendicular to the second surface 16F, the first surface 15F is formed so as to be inside the second surface 16F. The occurrence of defects at the end can be further suppressed.
- a tangent line from the first surface 15 toward the bulging portion 14 a and an extension line of the first surface 15 are formed in a cross section that is perpendicular to the second surface 16 and passes through the center of the composite substrate 10.
- the outer peripheral surface 17 is formed so that the angle ⁇ is an acute angle.
- the outer peripheral surface 17 is formed in a stepped shape so that the outer periphery is larger on the second surface 16G side than the first surface 15G.
- a composite substrate 10G including the piezoelectric substrate 14G may be used.
- the composite substrate 10G also has a continuous outer peripheral surface from the piezoelectric substrate 14G through the adhesive layer 19 to the support substrate 12G.
- the first surface 15G when the first surface 15G is projected onto the second surface 16G in a direction perpendicular to the second surface 16G, the first surface 15G is formed so as to be inside the second surface 16G.
- the volume on the second surface side can be made relatively large, and the occurrence of defects at the end can be further suppressed.
- the outer peripheral surface is formed by grinding the outer peripheral surface after bonding the support substrate 12 and the piezoelectric substrate 14 with the adhesive layer 19.
- the projection 15 is projected onto the second surface 16 in a direction perpendicular to the second surface 16, the support substrate 12 and the piezoelectric substrate 14 formed in advance so that the first surface 15 enters the inside of the second surface 16 are bonded to the adhesive layer 19. It is good also as what adhere
- the part of the support substrate 12 is ground.
- the present invention is not particularly limited to this.
- the piezoelectric substrate 14 and the adhesive layer 19 are ground, but the support substrate 12 may not be ground. .
- a lithium tantalate substrate (LT substrate) having an orientation flat portion (OF portion), a diameter of 100 mm, and a thickness of 250 ⁇ m was prepared as the piezoelectric substrate 14.
- a silicon substrate as a support substrate having an OF portion, a diameter of 100 mm, and a thickness of 350 ⁇ m was prepared as the support substrate 12 (FIG. 2A).
- the LT substrate a 42 ° Y-cut X-propagation LT substrate in which the propagation direction of the surface acoustic wave (SAW) is X and the cutting angle is a rotating Y-cut plate is used.
- the corners of the LT substrate are chamfered. As shown in FIG.
- chamfering starts from a position 300 ⁇ m inside from the outer peripheral surface of the LT substrate, and the chamfering angle at this position is 20 °.
- an epoxy adhesive is applied to the silicon substrate by spin coating, the LT substrate is attached, heated to 180 ° C., and the adhesive layer 19 (layer in which the epoxy adhesive is solidified) is bonded to a thickness of 0.3 ⁇ m.
- a substrate 20 was formed (FIG. 2B).
- the outer peripheral surface of the bonded substrate 20 was ground using the grinding apparatus 30 shown in FIGS. 3 and 4 (FIG. 2C).
- the outer peripheral surface of the bonded substrate 20 was ground using the grindstone portion 38 in which the angle ⁇ formed by the extended surface of the bonding surface 11 and the tangent line at the intersecting portion 18 was 45 °.
- the height of the grinding wheel 34 was adjusted so that the position 100 ⁇ m below the surface of the silicon substrate was the position of the lower surface of the grinding wheel portion 38.
- the silicon substrate was ground 100 ⁇ m from the surface and 1 mm from the outer periphery, but the initial outer diameter was maintained.
- the LT substrate and the adhesive layer were ground to a position 1 mm inside from the outer periphery of the silicon substrate.
- the chamfered portion of the LT substrate disappeared, and the outer peripheral surface of the LT substrate, the outer peripheral surface of the adhesive layer, and the outer peripheral surface of the silicon substrate on the adhesive layer side were on the same plane.
- the grinding wheel 34 was rotated so that the length at which the outer peripheral surface of the grinding wheel portion 38 passed per second through the contact position between the grinding wheel portion 38 and the bonded substrate 20 was 1500 m. Further, the rotation holding base 32 was rotated so that the contact position between the grindstone portion 38 and the bonded substrate 20 was 5 mm so that the outer peripheral surface of the bonded substrate 20 passed per second.
- polishing was performed with a polishing machine until the LT substrate had a thickness of 30 ⁇ m (FIG. 2D).
- a polishing machine a machine that performs mirror polishing after reducing the thickness as follows was used. That is, when the thickness is reduced, the ground surface of the bonded substrate 20 (ground substrate) is sandwiched between the polishing surface plate and the pressure plate, and polishing is performed between the ground substrate and the polishing surface plate. Slurry containing abrasive grains was supplied, and the pressure plate was used to rotate the pressure plate while pressing the substrate against the surface plate after grinding.
- the polishing surface plate is assumed to have a pad attached to the surface and the abrasive grains are changed to a high count, and by giving rotation and revolution motion to the pressure plate, A piezoelectric substrate whose surface was mirror-polished was used.
- the surface of the LT substrate after grinding was pressed against the surface of the platen, and the rotation speed of the rotation was 100 rpm, and the polishing was continued for 60 minutes.
- the polishing surface plate is assumed to have a pad attached to the surface and the abrasive grains are changed to a higher one, and the pressure for pressing the substrate to the surface plate after grinding is 0.2 MPa, the rotational speed of the rotation motion was polished at 100 rpm, the revolution speed was 100 rpm, and the polishing time was 60 minutes.
- five composite substrates 10 were manufactured, but the edge of the LT substrate was not chipped.
- Example 1 except that the outer peripheral surface of the bonded substrate 20 was ground using a grindstone portion 38 in which the angles ⁇ formed between the extended surface of the adhesive surface 11 and the tangent line at the intersection 18 were 60 ° and 70 °, respectively.
- the composite substrates 10 obtained through the same steps are referred to as Examples 2 and 3, respectively.
- FIG. 11 is a cross-sectional view schematically illustrating the configuration of the composite substrate 110 of Comparative Example 1.
- Comparative Example 1 after the bonded substrate 20 of FIG. 2B is formed, the grindstone portion 38 in which the angle ⁇ formed by the extended surface of the first surface 151 and the tangent at the intersecting portion 118 is 135 ° is used.
- the bonded substrate 20 was prepared by grinding the outer peripheral surface. In this comparative example 1, it produced through the process similar to Example 1 other than that.
- the first surface of the piezoelectric substrate 114 bonded to the support substrate 112 is the first surface 115 and the surface opposite to the first surface 115 is the second surface 116, the first surface
- the piezoelectric substrate 114 is formed so that the first surface 115 protrudes outside the second surface 116 when 115 is projected onto the second surface 116 in a direction perpendicular to the second surface 116.
- the composite substrate 110 has a shape in which the outer peripheral surface 117 is ground so that the outer periphery becomes smaller toward the second surface 116 (upper surface side) of the piezoelectric substrate 114.
- Five composite substrates of Comparative Example 1 were produced. As in Example 1, chipping of the edge of the LT substrate did not occur. For this reason, it was found that when the LT substrate is polished after the outer peripheral surface of the bonded substrate 20 is ground, the occurrence of chipping of the LT substrate during this polishing is at least suppressed.
- Comparative Example 2 The same process as in Comparative Example 1 was performed except that the outer peripheral surface of the bonded substrate 20 was ground using the grindstone portion 38 in which the angle ⁇ formed between the extended surface of the bonding surface 111 and the tangent at the intersecting portion 118 was 105 °. The composite substrate 110 obtained through this process was used as Comparative Example 2.
- FIG. 12 is a schematic view of the composite substrate of the example and the comparative example after the heat treatment. As shown in Table 2 and FIG. 12, in Examples 1 to 3, no defects such as chipping and cracks at the end of the composite substrate 10 were observed after the heat treatment. On the other hand, in Comparative Example 1, generation of fine cracks was confirmed at the end of the piezoelectric substrate 114 after heat treatment.
- the angle ⁇ formed by the tangent at the intersection 18 where the first surface 15 of the piezoelectric substrate 14 and the outer peripheral surface 17 intersect with the extended surface extending the first surface 15 of the piezoelectric substrate is 0 ° ⁇ ⁇ .
- the outer peripheral surface 17 is formed to be 90 °, it has been found that the occurrence of defects at the ends of the composite substrate can be further suppressed.
- the first surface 15 when the first surface 15 is projected onto the second surface 16 in a direction perpendicular to the second surface 16, the first surface 15 enters the inside of the second surface 16.
- the piezoelectric substrate 14 is formed on the substrate, it has been found that the occurrence of defects at the end of the composite substrate can be further suppressed.
- the outer periphery is such that the angle ⁇ formed by the tangent at the intersection 18 where the first surface 15 of the piezoelectric substrate 14 and the outer peripheral surface 17 intersect with the extended surface extending the first surface 15 of the piezoelectric substrate becomes an acute angle. Assuming that the surface 17 is formed, it has been found that the occurrence of defects at the end of the composite substrate can be further suppressed.
- the present invention can be used in the technical field of composite substrates having piezoelectric substrates.
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Abstract
Description
支持基板と、
圧電基板と、
前記支持基板と前記圧電基板とを接着する接着層と、を備え、
前記支持基板と接着されている側の前記圧電基板の面を第1面とし、該第1面の反対側の面を第2面としたときに、該第1面を該第2面に対して垂直方向に該第2面に投影すると、該第1面が該第2面の内側に入るように、該圧電基板に膨出部が形成されており、
前記圧電基板から前記接着層を通り前記支持基板まで連続な外周面を有するものである。
(a)支持基板と、角が面取りされた圧電基板とを用意する工程と、
(b)前記支持基板の表面の接合部と前記圧電基板の裏面とを接着層を介して貼り合わせて貼り合わせ基板を形成する工程と、
(c)前記貼り合わせ基板の外周面を研削し、前記圧電基板の表面と研磨定盤との間に研磨砥粒を介在させて、該圧電基板の表面を該研磨定盤により研磨することにより該圧電基板の厚みを薄くすると共に、該圧電基板の表面を鏡面研磨する工程と、を含み、
前記工程(c)では、前記支持基板と接着されている側の前記圧電基板の面を第1面とし、該第1面の反対側の面を第2面としたときに、該第1面を該第2面に対して垂直方向に該第2面に投影すると、該第1面が該第2面の内側に入るように該圧電基板に膨出部を形成すると共に、且つ前記圧電基板から前記接着層を通り前記支持基板まで連続な外周面を形成するよう前記貼り合わせ基板を加工するものである。
まず、圧電基板14として、オリエンテーションフラット部(OF部)を有し、直径が100mm、厚さが250μmのタンタル酸リチウム基板(LT基板)を用意した。また、支持基板12として、OF部を有し、直径が100mm、厚さが350μmの支持基板としてのシリコン基板を用意した(図2(a))。ここで、LT基板は、弾性表面波(SAW)の伝搬方向をXとし、切り出し角が回転Yカット板である42°YカットX伝搬LT基板を用いた。また、LT基板は、角が面取りされている。図2(a)に示すように、LT基板の外周面から300μm内側の位置から面取りが始まり、この位置での面取りの角度は20°である。次いで、シリコン基板にスピンコートによりエポキシ系接着剤を塗布し、LT基板を貼付けて180℃に加熱し、接着層19(エポキシ系接着剤が固化した層)の厚さが0.3μmの貼り合わせ基板20を形成した(図2(b))。
接着面11の延長面と交差部18での接線とのなす角度θがそれぞれ60°及び70°となる砥石部38を用いて貼り合わせ基板20の外周面を研削した以外は、実施例1と同様の工程を経て得られた複合基板10を、それぞれ実施例2,3とした。
図11は、比較例1の複合基板110の構成の概略を示す断面図である。比較例1は、図2(b)の貼り合わせ基板20を形成したあと、第1面151の延長面と交差部118での接線とのなす角度θが135°となる砥石部38を用いて貼り合わせ基板20の外周面を研削して作製した。この比較例1では、それ以外は実施例1と同様の工程を経て作製した。この複合基板110では、支持基板112と接着されている側の圧電基板114の面を第1面115とし、第1面115の反対側の面を第2面116としたときに、第1面115を第2面116に対して垂直方向に第2面116に投影すると、この第1面115が第2面116の外側に出るように圧電基板114が形成されている。また、複合基板110は、圧電基板114の第2面116(上面側)へ向かうと外周が小さくなるように外周面117が研削された形状を有している。この比較例1の複合基板を5枚作製したが、実施例1と同様に、LT基板の縁の欠けは発生しなかった。このため、貼り合わせ基板20の外周面を研削した後に、LT基板を研磨すると、この研磨時のLT基板の欠けの発生は少なくとも抑制されることが分かった。
接着面111の延長面と交差部118での接線とのなす角度θが105°となる砥石部38を用いて貼り合わせ基板20の外周面を研削した以外は、比較例1と同様の工程を経て得られた複合基板110を比較例2とした。
Claims (4)
- 支持基板と、
圧電基板と、
前記支持基板と前記圧電基板とを接着する接着層と、を備え、
前記支持基板と接着されている側の前記圧電基板の面を第1面とし、該第1面の反対側の面を第2面としたときに、該第1面を該第2面に対して垂直方向に該第2面に投影すると、該第1面が該第2面の内側に入るように、該圧電基板に膨出部が形成されており、
前記圧電基板から前記接着層を通り前記支持基板まで連続な外周面を有する、
複合基板。 - 前記第2面に対して垂直であり複合基板の中心を通る断面において、前記第1面から前記圧電基板の膨出部に向けた接線と前記第1面の延長線とがなす角度θが鋭角である、請求項1に記載の複合基板。
- 前記角度θが、45°≦θ≦70°の範囲である、請求項2に記載の複合基板。
- (a)支持基板と、角が面取りされた圧電基板とを用意する工程と、
(b)前記支持基板の表面の接合部と前記圧電基板の裏面とを接着層を介して貼り合わせて貼り合わせ基板を形成する工程と、
(c)前記貼り合わせ基板の外周面を研削し、前記圧電基板の表面と研磨定盤との間に研磨砥粒を介在させて、該圧電基板の表面を該研磨定盤により研磨することにより該圧電基板の厚みを薄くすると共に、該圧電基板の表面を鏡面研磨する工程と、を含み、
前記工程(c)では、前記支持基板と接着されている側の前記圧電基板の面を第1面とし、該第1面の反対側の面を第2面としたときに、該第1面を該第2面に対して垂直方向に該第2面に投影すると、該第1面が該第2面の内側に入るように該圧電基板に膨出部を形成すると共に、且つ前記圧電基板から前記接着層を通り前記支持基板まで連続な外周面を形成するよう前記貼り合わせ基板を加工する、
複合基板の製造方法。
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KR101579344B1 (ko) | 2015-12-21 |
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