WO2019220713A1 - 圧電性単結晶基板と支持基板との接合体 - Google Patents
圧電性単結晶基板と支持基板との接合体 Download PDFInfo
- Publication number
- WO2019220713A1 WO2019220713A1 PCT/JP2019/004999 JP2019004999W WO2019220713A1 WO 2019220713 A1 WO2019220713 A1 WO 2019220713A1 JP 2019004999 W JP2019004999 W JP 2019004999W WO 2019220713 A1 WO2019220713 A1 WO 2019220713A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- amorphous layer
- piezoelectric single
- single crystal
- support substrate
- substrate
- Prior art date
Links
- 239000000758 substrate Substances 0.000 title claims abstract description 118
- 239000013078 crystal Substances 0.000 title claims abstract description 62
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 60
- 230000002093 peripheral effect Effects 0.000 claims abstract description 40
- 229910052786 argon Inorganic materials 0.000 claims abstract description 39
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 16
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims abstract description 15
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 12
- 239000010955 niobium Substances 0.000 claims abstract description 12
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 12
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 4
- 125000004429 atom Chemical group 0.000 claims description 23
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 238000010897 surface acoustic wave method Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000001678 irradiating effect Effects 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000001994 activation Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010884 ion-beam technique Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 125000004430 oxygen atom Chemical group O* 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 235000019687 Lamb Nutrition 0.000 description 1
- 229910012463 LiTaO3 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000678 plasma activation Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02543—Characteristics of substrate, e.g. cutting angles
- H03H9/02574—Characteristics of substrate, e.g. cutting angles of combined substrates, multilayered substrates, piezoelectrical layers on not-piezoelectrical substrate
-
- 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
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/853—Ceramic compositions
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/16—Oxides
- C30B29/22—Complex oxides
- C30B29/30—Niobates; Vanadates; Tantalates
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/25—Constructional features of resonators using surface acoustic waves
-
- H—ELECTRICITY
- 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
-
- 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
- H10N30/704—Piezoelectric or electrostrictive devices based on piezoelectric or electrostrictive films or coatings
- H10N30/706—Piezoelectric or electrostrictive devices based on piezoelectric or electrostrictive films or coatings characterised by the underlying bases, e.g. substrates
-
- 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
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/853—Ceramic compositions
- H10N30/8542—Alkali metal based oxides, e.g. lithium, sodium or potassium niobates
Definitions
- the present invention relates to a joined body of a piezoelectric single crystal substrate and a support substrate.
- an SOI substrate composed of a high resistance Si / SiO 2 thin film / Si thin film is widely used.
- Plasma activation is used to realize an SOI substrate. This is because bonding can be performed at a relatively low temperature (400 ° C.).
- a composite substrate composed of a similar Si / SiO 2 thin film / piezoelectric thin film has been proposed to improve the characteristics of the piezoelectric device (Patent Document 1).
- Patent Document 1 a piezoelectric single crystal substrate made of lithium niobate or lithium tantalate and a silicon substrate provided with a silicon oxide layer are joined after being activated by an ion implantation method.
- Patent Document 3 the surface of a silicon substrate and the surface of a lithium tantalate substrate are surface-activated by a neutral atom beam, and then bonded to each surface so as to follow the interface between the silicon substrate and the lithium tantalate substrate.
- a neutral atom beam a neutral atom beam
- JP 2016-225537 A JP2014-086400 WO 2017 / 134980A1
- the lithium tantalate and lithium niobate single crystal substrates used for acoustic wave filters have low thermal conductivity. Due to the increase in transmission power accompanying the recent increase in communication volume and the heat generation from peripheral elements due to modularization, the acoustic wave filter is in an environment where the temperature tends to increase. As a result, an elastic wave filter made of a piezoelectric single crystal single plate could not be used for a high-performance communication terminal.
- An object of the present invention is to suppress warpage of a bonded body during heating in a bonded body of a piezoelectric single crystal substrate made of lithium niobate or the like and a support substrate.
- the joined body according to the present invention is: Support substrate, A piezoelectric single crystal substrate made of a material selected from the group consisting of lithium niobate, lithium tantalate and lithium niobate-lithium tantalate, and an amorphous material existing between the support substrate and the piezoelectric single crystal substrate An amorphous layer containing one or more metal atoms selected from the group consisting of niobium and tantalum, atoms constituting the support substrate, and argon atoms, and a central layer of the amorphous layer The concentration of the argon atom in the portion is higher than the concentration of the argon atom in the peripheral portion of the amorphous layer.
- the inventor tried to irradiate the bonding surface of the piezoelectric single crystal substrate and the bonding surface of the support substrate with an argon atom beam to activate each bonding surface and bond the activated bonding surfaces to each other. .
- a thin amorphous layer is formed along the interface between the piezoelectric single crystal substrate and the support substrate.
- the joined body when the joined body thus obtained is heated, the joined body may be warped.
- the present inventor studied the cause of warping, and conceived the possibility of warping due to the difference in thermal expansion between the piezoelectric single crystal substrate and the support substrate. It was considered structurally difficult to absorb the warp caused by such a difference in thermal expansion at the bonding interface between the piezoelectric single crystal substrate and the support substrate.
- the present inventor changed the center of the bonding interface, for example, by changing the exit structure of the argon atom beam when generating the amorphous layer along the bonding interface between the piezoelectric single crystal substrate and the support substrate.
- the argon concentration in the central part of the amorphous layer was made higher than the argon concentration in the peripheral part, and the influence on the warpage of the joined body during heating was examined. As a result, it was confirmed that the warpage when the joined body was heated was remarkably reduced.
- (A) shows the piezoelectric single crystal substrate 1, and (b) shows a state in which the activated surface 5 is generated by irradiating the surface 1 a of the piezoelectric single crystal substrate 1 with the argon atom beam A.
- (A) shows the support substrate 3, and (b) shows a state in which the surface 3a of the support substrate 3 is irradiated with an argon atom beam B.
- (A) shows the joined body 8 of the piezoelectric single crystal substrate 1 and the support substrate 3, (b) shows a state where the piezoelectric single crystal substrate 1 of the joined body 8A is thinned by processing, (c) Indicates an acoustic wave element 11.
- FIG. 1A a piezoelectric single crystal substrate 1 having a pair of main surfaces 1a and 1b is prepared.
- the bonding surface 1 a of the piezoelectric single crystal substrate 1 is irradiated with an argon atom beam as indicated by an arrow A to obtain a surface activated bonding surface 5.
- a support substrate 3 having a surface 3a is prepared.
- surface activation is performed by irradiating the surface 3a of the support substrate with an argon atom beam as shown by an arrow B, thereby forming an activated bonding surface 6.
- the activated bonding surface 5 on the piezoelectric single crystal substrate 1 and the activated bonding surface 6 of the support substrate 3 are brought into contact with each other and directly bonded to form a bonded body 8 shown in FIG. Can be obtained.
- an amorphous layer 7 is generated between the bonding surface 6 of the support substrate 3 and the bonding surface 5 of the piezoelectric single crystal substrate 1.
- an electrode may be provided on the piezoelectric single crystal substrate 1.
- the main surface 1b of the piezoelectric single crystal substrate 1 is processed to thin the substrate 1 to obtain a thinned piezoelectric single crystal substrate 1A.
- 9 is a processing surface.
- a predetermined electrode 10 is formed on the processed surface 9 of the piezoelectric single crystal substrate 1A of the joined body 8A, and the acoustic wave element 11 can be obtained.
- an amorphous layer 7 is provided between the support substrate 3 and the piezoelectric single crystal substrates 1 and 1A.
- the amorphous layer 7 includes one or more metal atoms selected from the group consisting of niobium and tantalum, atoms constituting the support substrate 3, and argon atoms.
- One or more metal atoms selected from the group consisting of niobium and tantalum may be niobium alone, tantalum alone, or both niobium and tantalum.
- the concentration of the metal atom is a total value of the niobium concentration and the tantalum concentration.
- the atoms constituting the support substrate 3 are a single species
- the atoms constituting the amorphous layer 7 are also a single species.
- the atoms constituting the support substrate 3 are one or more of these.
- niobium, tantalum, and oxygen are excluded from the atoms constituting the support substrate 3.
- the concentration of argon atoms in the central portion of the amorphous layer 7 is made higher than the concentration of argon atoms in the peripheral portion of the amorphous layer.
- the central portion of the amorphous layer 7 means the center of the amorphous layer 7 when the amorphous layer 7 is viewed in plan.
- the peripheral portion of the amorphous layer 7 is measured at three points in the ring-shaped region having a distance of 5 to 10 mm in the center direction from the end (edge) of the amorphous layer 7, and the average value thereof is calculated. Take.
- the concentration of argon atoms in the central portion of the amorphous layer 7 is preferably 2.0 atomic% or more, and more preferably 2.4 atomic% or more from the viewpoint of bonding strength. Moreover, the density
- the concentration of argon atoms in the peripheral portion of the amorphous layer 7 is preferably 2.0 atomic% or more, and more preferably 2.7 atomic% or more from the viewpoint of bonding strength. Moreover, the density
- concentration of the argon atom in the peripheral part of an amorphous layer is usually 5.0 atomic% or less, and it is preferable that it is 4.7 atomic% or less.
- the difference between the concentration of argon atoms in the central portion of the amorphous layer 7 and the concentration of argon atoms in the peripheral portion is 1.0 atomic% or more. It is preferable that it is 1.5 atomic% or more.
- the concentration of the metal atoms in the amorphous layer 7 is 40 to 50 atomic%, more preferably 41.8 to 46.7 atomic%.
- atoms constituting the support substrate 3 are other than tantalum, niobium, and oxygen atoms. This atom is preferably silicon.
- the concentration of the atoms constituting the support substrate 3 in the amorphous layer 7 is preferably 25 to 40 atomic%, and more preferably 28.3 to 38.1 atomic%.
- the amorphous layer 7 contains oxygen atoms.
- the concentration of oxygen atoms is preferably 15 to 21 atom%, and more preferably 17.1 to 20.2 atom%.
- the thickness of the amorphous layer 7 at the center is larger than the thickness of the peripheral portion of the amorphous layer 7. This further reduces warpage when the joined body is heated. From such a viewpoint, the difference between the thickness at the center of the amorphous layer 7 and the thickness at the peripheral edge of the amorphous layer 7 is preferably 1.0 nm or more, and more preferably 1.5 nm or more. .
- the thickness at the center of the amorphous layer 7 is preferably 5 to 8 nm, more preferably 5.9 to 6.8 nm.
- the thickness of the peripheral portion of the amorphous layer 7 is preferably 4 to 5 nm, and more preferably 4.4 to 4.9 nm or more.
- measuring device The microstructure is observed using a transmission electron microscope (H-9500, manufactured by Hitachi High-Technologies Corporation).
- Measurement condition A sample sliced by the FIB (focused ion beam) method is observed at an acceleration voltage of 200 kV.
- the concentration of each atom in the amorphous layer 7 is measured as follows. measuring device: Elemental analysis is performed using an elemental analyzer (JEOL JEM-ARM200F). Measurement condition: A sample sliced by the FIB (focused ion beam) method is observed at an acceleration voltage of 200 kV.
- the material of the support substrate 3 is not particularly limited, but a highly thermally conductive semiconductor such as Si, SiC, or GaN, or a ceramic such as AlN or SiC can be used.
- the piezoelectric single crystal substrate 1 (1A) used in the present invention is a lithium tantalate (LT) single crystal, a lithium niobate (LN) single crystal, or a lithium niobate-lithium tantalate solid solution. Since these have a high propagation speed of elastic waves and a large electromechanical coupling coefficient, they are suitable as surface acoustic wave devices for high frequencies and wideband frequencies.
- the normal direction of the main surface of the piezoelectric single crystal substrate 1 (1A) is not particularly limited.
- the piezoelectric single crystal substrate 1 (1A) is made of LT, it is the propagation direction of the surface acoustic wave. It is preferable to use the one rotated by 32 to 55 ° from the Y axis to the Z axis around the X axis and the Euler angle display (180 °, 58 to 35 °, 180 °) since the propagation loss is small.
- the piezoelectric single crystal substrate 1 (1A) is made of LN, (a) the surface rotated by 37.8 ° from the Z axis to the -Y axis around the X axis, which is the propagation direction of the surface acoustic wave, Euler angle display It is preferable to use (0 °, 37.8 °, 0 °) because of the large electromechanical coupling coefficient, or (b) from the Y axis to the Z axis centering on the X axis, which is the propagation direction of the surface acoustic wave.
- the size of the piezoelectric single crystal substrate 1 (1A) is not particularly limited.
- the diameter is 100 to 200 mm and the thickness is 0.15 to 1 mm.
- the thickness of the piezoelectric single crystal substrate 1A is preferably 20 ⁇ m or less.
- the thickness of the support substrate 3 is preferably 150 ⁇ m or more, and more preferably 230 ⁇ m or more, from the viewpoint of easy handling of the joined body 8 (8A).
- the thermal resistance of the entire bonded body 8 (8A) becomes high, so that it is preferably 750 ⁇ m or less, and more preferably 675 ⁇ m or less.
- the surface 1a of the piezoelectric single crystal substrate 1 and the surface 3a of the support substrate 3 are irradiated with argon atom beams A and B to activate the surfaces 1a and 3a.
- the ion beam is neutralized by the grid, so that a beam of argon atoms is emitted from the fast atom beam source.
- the voltage upon activation by beam irradiation is preferably 0.5 to 2.0 kV, and the current is preferably 50 to 200 mA.
- the grid has a distribution of hole diameter, direction, and inclination so that more beams are irradiated to the central portion.
- the one in which the central portion of the substrate for irradiating the beam comes on the extension line of the center on the entrance side and the center on the exit side of the grid hole The size of the grid hole in the 30 mm square portion is increased by 15 to 30% compared to the others.
- the distribution of the beam irradiation amount can also be provided by increasing the flow rate of Ar gas by 40% only in the region of the grid central portion 30 mm.
- it is not limited to the method mentioned above, As a result, what is necessary is just the method of irradiating more beams to a center part than a peripheral part.
- the temperature at this time is room temperature, specifically, preferably 40 ° C. or lower, more preferably 30 ° C. or lower.
- the temperature at the time of joining is particularly preferably 20 ° C. or higher and 25 ° C. or lower.
- the pressure at the time of joining is preferably 100 to 20000 N.
- the surface 1a of the piezoelectric single crystal substrate 1 and the surface 3a of the support substrate 3 are planarized before irradiation with an argon atom beam.
- Methods for flattening the surfaces 1a and 3a include lap polishing and chemical mechanical polishing (CMP).
- the flat surface is preferably Ra ⁇ 1 nm, more preferably 0.3 nm or less.
- the annealing temperature is preferably 100 ° C. or higher and 300 ° C. or lower.
- the joined bodies 8 and 8A of the present invention can be suitably used for the acoustic wave element 11.
- a surface acoustic wave device receives an input-side IDT (Interdigital Transducer) electrode (also referred to as a comb-shaped electrode or a comb-shaped electrode) and a surface acoustic wave on the surface of a piezoelectric single crystal substrate.
- IDT Interdigital Transducer
- the material constituting the electrode 10 on the piezoelectric single crystal substrate 1A is preferably aluminum, aluminum alloy, copper, or gold, and more preferably aluminum or aluminum alloy.
- As the aluminum alloy it is preferable to use Al mixed with 0.3 to 5% by weight of Cu.
- Ti, Mg, Ni, Mo, Ta may be used instead of Cu.
- Example 1 According to the method described with reference to FIGS. 1 to 3, a joined body 8A shown in FIG. Specifically, a 42Y cut black LiTaO3 (LT) substrate (piezoelectric single crystal substrate) 1 having a thickness of 0.25 mm and polished on both sides to a mirror surface, and a high resistance ( ⁇ 2 k ⁇ ) having a thickness of 0.23 mm Cm) A Si substrate (support substrate) 3 was prepared. The substrate size is 100 mm for all. Next, the surface 1a of the piezoelectric single crystal substrate 1 and the surface 3a of the support substrate 3 were cleaned, and particles were removed from the surfaces.
- LT LiTaO3
- the surface 1a of the piezoelectric single crystal substrate 1 and the surface 3a of the support substrate 3 were surface activated, respectively.
- both substrates were introduced into an ultra-high vacuum chamber and each surface was surface activated with an argon atom beam for 50 seconds.
- a grid having a grid hole diameter increased by 20% only in the central 30 mm square region was used so that the central part of each surface 1a, 3a was irradiated with a large amount of argon atom beam.
- the activated bonding surfaces 5 and 6 of both substrates were brought into contact with each other at room temperature.
- a load of 200 kgf was applied by bringing the piezoelectric single crystal substrate 1 side into contact.
- the joined body 8 was taken out of the chamber, put in an oven in a nitrogen atmosphere for the purpose of increasing the joining strength, and held at 120 ° C. for 10 hours to obtain the joined body 8.
- the piezoelectric single crystal substrate 1 of the obtained bonded body 8 was ground and polished, and finally a bonded body 8A having a piezoelectric single crystal substrate 1A thickness of 20 ⁇ m was obtained.
- the concentration of each atom in the amorphous layer 7 at the bonding interface between the piezoelectric single crystal substrate 1A and the support substrate 3 and the thickness of the amorphous layer 7 were measured as described above. The measurement results are shown in Table 1 and below. Further, the obtained bonded body was heated at 80 ° C., and the size of SORI was measured. Here, for the measurement of SORI, a laser displacement meter LK-G5000 manufactured by Keyence was used to measure the height information of the wafer placed on the movable stage, and scan measurement was performed on the line. The measurement was performed on the substrate orientation flat and two lines in the horizontal and vertical directions, and the wafer having the larger SORI value was used as the wafer SORI.
- Tantalum 46.7 atomic% (central part), 42.1 atomic% (peripheral part) Silicon: 28.3 atomic% (central part), 38.0 atomic% (peripheral part)
- Oxygen 20.2 atomic% (central part), 17.2 atomic% (peripheral part)
- Argon 4.8 atomic% (central part), 2.7 atomic% (peripheral part)
- Example 2 A joined body 8A was produced and evaluated in the same manner as in Example 1.
- the material of the piezoelectric single crystal substrates 1 and 1A is a lithium niobate (LN) single crystal.
- LN lithium niobate
- Niobium 45.7 atomic% (central part), 41.8 atomic% (peripheral part)
- Silicon 33.0 atomic% (center part), 38.1 atomic% (peripheral part)
- Oxygen 17.1 atomic% (central part), 17.4 atomic% (peripheral part)
- Argon 4.2 atomic% (central part), 2.7 atomic% (peripheral part)
- Example 1 A joined body 8A was produced and evaluated in the same manner as in Example 1. However, in this example, the grid hole diameter of the argon atom beam exit is made the same at both the central portion and the peripheral portion so that the whole of the bonding surface 8A is irradiated with the argon atom beam substantially uniformly. The results are shown in Table 1 and below.
- Tantalum 41.5 atomic% (central part), 42.2 atomic% (peripheral part) Silicon: 38.4 atomic% (central part), 37.6 atomic% (peripheral part) Oxygen: 17.7 atomic% (central part), 17.6 atomic% (peripheral part) Argon: 2.4 atomic% (center part), 2.6 atomic% (peripheral part)
- Comparative Example 2 A joined body 8A was produced and evaluated in the same manner as in Comparative Example 1. However, in this example, the irradiation amount of the argon atom beam was increased to 360 kJ. The results are shown in Table 1 and below. Tantalum: 46.0 atomic% (central part), 46.7 atomic% (peripheral part silicon: 31.9 atomic% (central part), 30.4 atomic% (peripheral part) Oxygen: 17.4 atomic% (central part), 18.2 atomic% (peripheral part) Argon: 4.7 atomic% (center part), 4.7 atomic% (peripheral part)
- the argon atom concentration in the central portion of the amorphous layer 7 is 2.4 atomic%, and the argon atom concentration in the peripheral portion of the amorphous layer 7 is 2.6 atoms. %,
- the thickness at the center of the amorphous layer 7 is 4.5 nm, and the thickness at the peripheral edge of the amorphous layer 7 is 4.2 nm, but the SORI when heated at 80 ° C. is 650 ⁇ m. there were.
- the argon atom concentration in the central part of the amorphous layer 7 is 4.7 atomic%
- the argon atom concentration in the peripheral part of the amorphous layer 7 is 4.7 atomic%.
- the thickness of the central portion of the layer 7 is 5.8 nm and the thickness of the peripheral portion of the amorphous layer 7 is 5.5 nm, but the SORI when heated at 80 ° C. is 600 ⁇ m. Not much improved.
- Example 1 the argon atom concentration in the central part of the amorphous layer 7 is 4.8 atomic%, and the argon atom concentration in the peripheral part of the amorphous layer 7 is 2.7 atomic%.
- the thickness at the center of the layer 7 was 5.9 nm and the thickness at the peripheral edge of the amorphous layer 7 was 4.4 nm, but the SORI when heated at 80 ° C. was reduced to 320 ⁇ m.
- Example 2 the argon atom concentration in the central part of the amorphous layer 7 is 4.2 atomic%, and the argon atom concentration in the peripheral part of the amorphous layer 7 is 2.7 atomic%.
- the thickness of the central portion of the layer 7 was 6.8 nm and the thickness of the peripheral portion of the amorphous layer 7 was 4.9 nm, but the SORI during heating at 80 ° C. was reduced to 300 ⁇ m.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Acoustics & Sound (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Inorganic Chemistry (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Ceramic Products (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
支持基板、
ニオブ酸リチウム、タンタル酸リチウムおよびニオブ酸リチウム-タンタル酸リチウムからなる群より選ばれた材質からなる圧電性単結晶基板、および
前記支持基板と前記圧電性単結晶基板との間に存在する非晶質層であって、ニオブおよびタンタルからなる群より選ばれた一種以上の金属原子、前記支持基板を構成する原子およびアルゴン原子を含む非晶質層
を備えており、前記非晶質層の中央部における前記アルゴン原子の濃度が前記非晶質層の周縁部における前記アルゴン原子の濃度よりも高いことを特徴とする。
まず、図1(a)に示すように、一対の主面1a、1bを有する圧電性単結晶基板1を準備する。次いで、図1(b)に示すように、圧電性単結晶基板1の接合面1aに対して矢印Aのようにアルゴン原子ビームを照射し、表面活性化された接合面5を得る。
本発明では、支持基板3と圧電性単結晶基板1、1Aとの間に非晶質層7を設ける。この非晶質層7は、ニオブおよびタンタルからなる群より選ばれた一種以上の金属原子、支持基板3を構成する原子およびアルゴン原子を含む。
測定装置:
透過型電子顕微鏡(日立ハイテクノロジーズ製 H-9500)を用いて微構造観察する。
測定条件:
FIB(集束イオンビーム)法にて薄片化したサンプルに対して、加速電圧200kVにて観察する。
測定装置:
元素分析装置(日本電子 JEM-ARM200F)を用いて元素分析を行う。
測定条件:
FIB(集束イオンビーム)法にて薄片化したサンプルに対して、加速電圧200kVにて観察する。
弾性波素子11としては、弾性表面波デバイスやラム波素子、薄膜共振子(FBAR)などが知られている。例えば、弾性表面波デバイスは、圧電性単結晶基板の表面に、弾性表面波を励振する入力側のIDT(Interdigital Transducer)電極(櫛形電極、すだれ状電極ともいう)と弾性表面波を受信する出力側のIDT電極とを設けたものである。入力側のIDT電極に高周波信号を印加すると、電極間に電界が発生し、弾性表面波が励振されて圧電性単結晶基板上を伝搬していく。そして、伝搬方向に設けられた出力側のIDT電極から、伝搬された弾性表面波を電気信号として取り出すことができる。
図1~図3を参照しつつ説明した方法に従い、図3(b)に示す接合体8Aを作製した。
具体的には、厚さが0.25mmで両面が鏡面に研磨されている42YカットのブラックLiTaO3(LT)基板(圧電性単結晶基板)1と、厚みが0.23mmの高抵抗(≧2kΩ・cm)Si基板(支持基板)3を用意した。基板サイズはいずれも100mmである。次いで、圧電性単結晶基板1の表面1aおよび支持基板3の表面3aをそれぞれ洗浄し、その表面からパーティクルを除去した。
ここで、SORIの測定にはキーエンス製レーザー変位計LK-G5000を用い、可動ステージの上に乗せたウエハーの高さ情報を測定し、ライン上にスキャン測定した。測定は基板のオリエンテーションフラットと水平方向および垂直方向の2ラインで行い、SORI値が大きいほうをウエハーのSORIとした。
タンタル:46.7原子%(中央部)、42.1原子%(周縁部)
珪素: 28.3原子%(中央部)、38.0原子%(周縁部)
酸素: 20.2原子%(中央部)、17.2原子%(周縁部)
アルゴン:4.8原子%(中央部)、2.7原子%(周縁部)
実施例1と同様にして接合体8Aを作製し、評価した。ただし、本例では、圧電性単結晶基板1、1Aの材質をニオブ酸リチウム(LN)単結晶とした。結果を表1および下記に示す。
ニオブ: 45.7原子%(中央部)、41.8原子%(周縁部)
珪素: 33.0原子%(中央部)、38.1原子%(周縁部)
酸素: 17.1原子%(中央部)、17.4原子%(周縁部)
アルゴン:4.2原子%(中央部)、2.7原子%(周縁部)
実施例1と同様にして接合体8Aを作製し、評価した。ただし、本例では、アルゴン原子ビームの射出口のグリッド孔径を中央部も周縁部も同じにすることで、接合面8Aの全体にアルゴン原子ビームが略均等に照射されるようにした。結果を表1および下記に示す。
タンタル:41.5原子%(中央部)、42.2原子%(周縁部)
珪素: 38.4原子%(中央部)、37.6原子%(周縁部)
酸素: 17.7原子%(中央部)、17.6原子%(周縁部)
アルゴン:2.4原子%(中央部)、2.6原子%(周縁部)
比較例1と同様にして接合体8Aを作製し、評価した。ただし、本例では、アルゴン原子ビームの照射量を360kJまで増大させた。結果を表1および下記に示す。
タンタル:46.0原子%(中央部)、46.7原子%(周縁部
珪素: 31.9原子%(中央部)、30.4原子%(周縁部)
酸素: 17.4原子%(中央部)、18.2原子%(周縁部)
アルゴン:4.7原子%(中央部)、4.7原子%(周縁部)
Claims (4)
- 支持基板、
ニオブ酸リチウム、タンタル酸リチウムおよびニオブ酸リチウム-タンタル酸リチウムからなる群より選ばれた材質からなる圧電性単結晶基板、および
前記支持基板と前記圧電性単結晶基板との間に存在する非晶質層であって、ニオブおよびタンタルからなる群より選ばれた一種以上の金属原子、前記支持基板を構成する原子およびアルゴン原子を含む非晶質層
を備えている接合体であって、
前記非晶質層の中央部における前記アルゴン原子の濃度が前記非晶質層の周縁部における前記アルゴン原子の濃度よりも高いことを特徴とする、接合体。
- 前記非晶質層の前記中央部における厚さが前記非晶質層の前記周縁部における厚さよりも大きいことを特徴とする、請求項1記載の接合体。
- 前記支持基板が珪素からなることを特徴とする、請求項1または2記載の接合体。
- 前記圧電性単結晶基板の厚さが50μm以下であることを特徴とする、請求項1~3のいずれか一つの請求項に記載の接合体。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020207035117A KR102326982B1 (ko) | 2018-05-17 | 2019-02-13 | 압전성 단결정 기판과 지지 기판의 접합체 |
CN201980026646.8A CN112088149B (zh) | 2018-05-17 | 2019-02-13 | 压电性单晶基板与支撑基板的接合体 |
JP2019544079A JP6698954B2 (ja) | 2018-05-17 | 2019-02-13 | 圧電性単結晶基板と支持基板との接合体 |
DE112019001985.6T DE112019001985B4 (de) | 2018-05-17 | 2019-02-13 | Verbundener Körper aus einem piezoelektrischen Einkristallsubstrat und einem Trägersubstrat |
US17/097,563 US11107973B2 (en) | 2018-05-17 | 2020-11-13 | Joined body of piezoelectric single-crystal substrate and support substrate |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018-095260 | 2018-05-17 | ||
JP2018095260 | 2018-05-17 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/097,563 Continuation US11107973B2 (en) | 2018-05-17 | 2020-11-13 | Joined body of piezoelectric single-crystal substrate and support substrate |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2019220713A1 true WO2019220713A1 (ja) | 2019-11-21 |
Family
ID=68540017
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2019/004999 WO2019220713A1 (ja) | 2018-05-17 | 2019-02-13 | 圧電性単結晶基板と支持基板との接合体 |
Country Status (7)
Country | Link |
---|---|
US (1) | US11107973B2 (ja) |
JP (1) | JP6698954B2 (ja) |
KR (1) | KR102326982B1 (ja) |
CN (1) | CN112088149B (ja) |
DE (1) | DE112019001985B4 (ja) |
TW (1) | TWI787486B (ja) |
WO (1) | WO2019220713A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021141081A1 (ja) * | 2020-01-10 | 2021-07-15 | 日本碍子株式会社 | 圧電振動基板および圧電振動素子 |
JP7075529B1 (ja) | 2021-06-11 | 2022-05-25 | 日本碍子株式会社 | 複合基板および複合基板の製造方法 |
JP7420922B2 (ja) | 2020-03-31 | 2024-01-23 | 京セラ株式会社 | 接合基板 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102287005B1 (ko) * | 2018-06-22 | 2021-08-09 | 엔지케이 인슐레이터 엘티디 | 접합체 및 탄성파 소자 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014077213A1 (ja) * | 2012-11-14 | 2014-05-22 | 日本碍子株式会社 | 複合基板 |
WO2017155002A1 (ja) * | 2016-03-11 | 2017-09-14 | ボンドテック株式会社 | 基板接合方法 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1187340A (ja) * | 1997-09-05 | 1999-03-30 | Mitsubishi Electric Corp | 半導体装置及びその製造方法 |
TW541584B (en) * | 2001-06-01 | 2003-07-11 | Semiconductor Energy Lab | Semiconductor film, semiconductor device and method for manufacturing same |
JP3774782B2 (ja) * | 2003-05-14 | 2006-05-17 | 富士通メディアデバイス株式会社 | 弾性表面波素子の製造方法 |
JP2014086400A (ja) | 2012-10-26 | 2014-05-12 | Mitsubishi Heavy Ind Ltd | 高速原子ビーム源およびそれを用いた常温接合装置 |
KR101497888B1 (ko) * | 2012-11-14 | 2015-03-02 | 엔지케이 인슐레이터 엘티디 | 복합 기판 및 그 제법 |
CN103515536B (zh) * | 2013-07-01 | 2017-05-31 | 中国科学院青岛生物能源与过程研究所 | 一种反型有机太阳能电池的简易制备方法 |
JP5697731B2 (ja) | 2013-10-28 | 2015-04-08 | キヤノン株式会社 | X線撮像システム、制御方法、及びプログラム |
CN105874607B (zh) * | 2014-07-17 | 2019-07-12 | 富士电机株式会社 | 半导体装置以及半导体装置的制造方法 |
JP6454606B2 (ja) | 2015-06-02 | 2019-01-16 | 信越化学工業株式会社 | 酸化物単結晶薄膜を備えた複合ウェーハの製造方法 |
US10541667B2 (en) * | 2015-08-25 | 2020-01-21 | Avago Technologies International Sales Pte. Limited | Surface acoustic wave (SAW) resonator having trap-rich region |
JP6549054B2 (ja) | 2016-02-02 | 2019-07-24 | 信越化学工業株式会社 | 複合基板および複合基板の製造方法 |
DE112018000012B4 (de) | 2017-03-31 | 2019-11-07 | Ngk Insulators, Ltd. | Verbundene Körper und Akustikwellenvorrichtungen |
JP7097727B2 (ja) * | 2018-03-23 | 2022-07-08 | 日本電産マシンツール株式会社 | 複合基板及び複合基板の製造方法 |
US11595019B2 (en) * | 2018-04-20 | 2023-02-28 | Taiyo Yuden Co., Ltd. | Acoustic wave resonator, filter, and multiplexer |
-
2019
- 2019-02-13 KR KR1020207035117A patent/KR102326982B1/ko active IP Right Grant
- 2019-02-13 DE DE112019001985.6T patent/DE112019001985B4/de active Active
- 2019-02-13 CN CN201980026646.8A patent/CN112088149B/zh active Active
- 2019-02-13 JP JP2019544079A patent/JP6698954B2/ja active Active
- 2019-02-13 WO PCT/JP2019/004999 patent/WO2019220713A1/ja active Application Filing
- 2019-03-22 TW TW108109895A patent/TWI787486B/zh active
-
2020
- 2020-11-13 US US17/097,563 patent/US11107973B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014077213A1 (ja) * | 2012-11-14 | 2014-05-22 | 日本碍子株式会社 | 複合基板 |
WO2017155002A1 (ja) * | 2016-03-11 | 2017-09-14 | ボンドテック株式会社 | 基板接合方法 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021141081A1 (ja) * | 2020-01-10 | 2021-07-15 | 日本碍子株式会社 | 圧電振動基板および圧電振動素子 |
JPWO2021141081A1 (ja) * | 2020-01-10 | 2021-07-15 | ||
JP7015411B2 (ja) | 2020-01-10 | 2022-02-02 | 日本碍子株式会社 | 圧電振動基板および圧電振動素子 |
TWI826762B (zh) * | 2020-01-10 | 2023-12-21 | 日商日本碍子股份有限公司 | 壓電振動基板及壓電振動元件 |
JP7420922B2 (ja) | 2020-03-31 | 2024-01-23 | 京セラ株式会社 | 接合基板 |
JP7075529B1 (ja) | 2021-06-11 | 2022-05-25 | 日本碍子株式会社 | 複合基板および複合基板の製造方法 |
JP2022189405A (ja) * | 2021-06-11 | 2022-12-22 | 日本碍子株式会社 | 複合基板および複合基板の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
DE112019001985T5 (de) | 2020-12-31 |
CN112088149B (zh) | 2021-08-27 |
TW202012343A (zh) | 2020-04-01 |
JPWO2019220713A1 (ja) | 2020-05-28 |
CN112088149A (zh) | 2020-12-15 |
JP6698954B2 (ja) | 2020-05-27 |
US20210066577A1 (en) | 2021-03-04 |
US11107973B2 (en) | 2021-08-31 |
KR102326982B1 (ko) | 2021-11-16 |
KR20200142591A (ko) | 2020-12-22 |
DE112019001985B4 (de) | 2022-05-05 |
TWI787486B (zh) | 2022-12-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2018180827A1 (ja) | 接合体および弾性波素子 | |
WO2019220713A1 (ja) | 圧電性単結晶基板と支持基板との接合体 | |
JP7210497B2 (ja) | 圧電性材料基板と支持基板との接合体 | |
US11632093B2 (en) | Acoustic wave devices and a method of producing the same | |
JP6563616B2 (ja) | 接合体および弾性波素子 | |
JP6644208B1 (ja) | 接合体および弾性波素子 | |
WO2018096797A1 (ja) | 接合体 | |
WO2019244461A1 (ja) | 接合体および弾性波素子 | |
WO2019188350A1 (ja) | 接合体および弾性波素子 | |
JP6776484B1 (ja) | 複合基板および弾性波素子 | |
WO2020250490A1 (ja) | 複合基板、弾性波素子および複合基板の製造方法 | |
JP6761919B1 (ja) | 複合基板および弾性波素子 | |
JPWO2019039475A1 (ja) | 接合体および弾性波素子 | |
JP6621574B1 (ja) | 接合体および弾性波素子 | |
WO2019187577A1 (ja) | 圧電性材料基板と支持基板との接合体 | |
JP6612002B1 (ja) | 接合体および弾性波素子 | |
US20210328569A1 (en) | Bonded body of piezoelectric material substrate and supporting substrate | |
WO2020250491A1 (ja) | 複合基板、弾性波素子および複合基板の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2019544079 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 19802480 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20207035117 Country of ref document: KR Kind code of ref document: A |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 19802480 Country of ref document: EP Kind code of ref document: A1 |