Resonator Device And Method For Manufacturing Resonator Device

A resonator device includes a base and a resonator component disposed on the base. The base includes a semiconductor substrate having a first surface and a second surface that are in a front-to-back relation with each other; an integrated circuit that includes a wiring layer disposed at the second surface side and including a connection pad and includes an insulating layer disposed between the second surface and the wiring layer; a through electrode that penetrates the semiconductor substrate and the insulating layer and is coupled to the connection pad; and an annular metal layer that is disposed so as to penetrate the insulating layer between the second surface and the wiring layer and surrounds the through electrode in a plan view of the semiconductor substrate.

The present application is based on, and claims priority from JP Application Serial Number 2021-010083, filed Jan. 26, 2021, the disclosure of which is hereby incorporated by reference herein in its entirety.

BACKGROUND

1. Technical Field

The present disclosure relates to a resonator device and a method for manufacturing a resonator device.

2. Related Art

A semiconductor substrate described in JP-T-2014-519201 includes a silicon substrate, an insulating layer formed on the silicon substrate, a conductive pad formed on the insulating layer, and a through electrode penetrating the silicon substrate and the insulating layer and coupled to the conductive pad. A method for forming a through electrode includes forming a through hole in a silicon substrate by dry etching, forming a through hole in an insulating layer by wet etching, and filling the through holes with a metal material.

As described above, in the method for forming a through electrode in JP-T-2014-519201, the through hole is formed in the insulating layer by the wet etching. However, the wet etching is isotropic etching. Therefore, there is a problem that side etching occurs in the insulating layer, and the metal material enters a void unintentionally generated by the side etching, which may cause a pattern failure of a wiring (hereinafter, also referred to as “the wiring pattern failure due to the side etching”).

SUMMARY

A resonator device according to the present disclosure includes: a base; and a resonator component disposed on the base, in which the base includes a semiconductor substrate having a first surface and a second surface that are in a front-to-back relation with each other; an integrated circuit that includes a wiring layer disposed at the second surface side and including a connection pad and includes an insulating layer disposed between the second surface and the wiring layer; a through electrode that penetrates the semiconductor substrate and the insulating layer and is coupled to the connection pad; and an annular metal layer that is disposed so as to penetrate the insulating layer between the second surface and the wiring layer, and surrounds the through electrode in a plan view of the semiconductor substrate.

A method for manufacturing a resonator device according to the present disclosure includes: a base preparation step of preparing a base that includes a semiconductor substrate having a first surface and a second surface that are in a front-to-back relation with each other, an integrated circuit that includes a wiring layer disposed at the second surface side and including a connection pad and includes an insulating layer disposed between the second surface and the wiring layer, and an annular metal layer that is disposed so as to penetrate the insulating layer between the second surface and the wiring layer; and a through electrode forming step of forming a through electrode penetrating the semiconductor substrate and the insulating layer and coupled to the connection pad through an inside of the metal layer, in which the through electrode forming step includes a through hole forming step of forming a through hole from the first surface to the connection pad through the inside of the metal layer by penetrating the semiconductor substrate by dry etching and then penetrating the insulating layer by wet etching; and a conductive material arranging step of disposing a conductive material in the through hole to form the through electrode.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereinafter, preferred embodiments of a resonator device are described with reference to the accompanying drawings. Further, for convenience of illustration, an upper side of a paper surface inFIGS. 1, 3, and 7 to 15is also referred to as “upper”, and a lower side of the paper surface is also referred to as “lower”.

First Embodiment

FIG. 1is a vertical cross-sectional view illustrating a resonator device according to a first embodiment.FIG. 2is a plan view illustrating an upper surface of a base.FIG. 3is a vertical cross-sectional view illustrating a metal layer surrounding a through electrode.FIG. 4is a horizontal cross-sectional view illustrating the metal layer surrounding the through electrode.FIG. 5is a plan view illustrating a resonator component.FIG. 6is a flowchart illustrating manufacturing steps of a resonator device.FIGS. 7 to 14are vertical cross-sectional views illustrating a method for manufacturing the resonator device.FIG. 1is a cross-sectional view taken along a line A-A inFIG. 2.

As illustrated inFIG. 1, a resonator device1includes a package10including an accommodating portion S, and a resonator component4accommodated in the accommodating portion S. The package10includes a base2on which the resonator component4is mounted, and a lid3covering the resonator component4and bonded to an upper surface of the base2. The base2includes a semiconductor substrate5and an integrated circuit6disposed on the semiconductor substrate5.

The semiconductor substrate5is a silicon substrate, in particular, a P-type silicon substrate. However, the semiconductor substrate5is not particularly limited, and may be an N-type silicon substrate. The semiconductor substrate5may be a semiconductor substrate other than the silicon substrate, for example, a Ge, GaP, GaAs, or InP semiconductor substrate.

The semiconductor substrate5is plate-shaped and has a first surface5aand a second surface5bthat are in a front-to-back relation with each other. The first surface5ais an upper surface, and the second surface5bis a lower surface. An insulating film50made of silicon oxide (SiO2) is formed on a surface of the semiconductor substrate5. However, the insulating film50is not particularly limited, and may be, for example, an organic insulating film.

The integrated circuit6electrically coupled to the resonator component4is formed at a second surface5bside of the semiconductor substrate5. By forming the integrated circuit6at the semiconductor substrate5, the semiconductor substrate5can be effectively utilized. In particular, by forming the integrated circuit6at the second surface5bside, as compared with a case where the integrated circuit6is formed at a first surface5aside, a wide space for forming the integrated circuit6can be secured since no bonding region with the lid3exists.

The integrated circuit6includes an oscillation circuit6A that is electrically coupled to the resonator component4and generates an oscillation signal such as a clock signal by oscillating the resonator component4. The integrated circuit6may include a circuit in addition to the oscillation circuit6A. Examples of the circuit include a processing circuit that processes an output signal from the oscillation circuit6A, and examples of such a processing circuit include a PLL circuit.

A stacked body60in which an etching stop layer61, an insulating layer62, a wiring layer63, an insulating layer64, a wiring layer65, an insulating layer66, a passivation film67, and a terminal layer68are stacked in this order is formed at the second surface5bside. A plurality of active components (not illustrated) formed at the second surface5bside via the wiring layers63and65are electrically coupled to form the integrated circuit6. The terminal layer68includes a plurality of mounting terminals681. The integrated circuit6is electrically coupled to an external device via the mounting terminals681. The number of the wiring layers provided in the stacked body60is not particularly limited, and may be one or three or more.

The base2is formed with a pair of through holes21and22that penetrate from the upper surface side of the base to the wiring layer63through the semiconductor substrate5, the etching stop layer61, and the insulating layer62in a thickness direction. As will be described in a method for manufacturing the resonator device1described later, the through holes21and22are formed by penetrating the semiconductor substrate5and the etching stop layer61by dry etching, and then penetrating the insulating layer62by wet etching. According to such a forming method, since the through holes21and22reach the wiring layer63during the wet etching, a plasma damage to the wiring layer63can be prevented. Since the semiconductor substrate5is penetrated by the dry etching, the through holes21and22having a high aspect ratio can be formed. Therefore, a reliability of the resonator device1can be improved and a size of the resonator device1can be reduced.

A conductive material E is filled in the through holes21and22, and through electrodes210and220are formed. The through electrodes210and220are electrically coupled to connection pads631and632of the wiring layer63, respectively. That is, the through electrodes210and220are coupled to the connection pads631and632included in the wiring layer63, located closest to the semiconductor substrate5, among the plurality of wiring layers63and65included in the integrated circuit6. Accordingly, the through electrodes210and220can be shortened as compared with a case of coupling to connection pads included in the wiring layer65. Therefore, the through electrodes210and220can be easily formed. However, the present disclosure is not limited thereto, and for example, the through electrodes210and220may be coupled to the connection pads included in the wiring layer65.

As illustrated inFIG. 2, a pair of wirings28and29electrically coupled to the resonator component4via metal bumps81and82are disposed at the first surface5aside of the semiconductor substrate5. The wiring28is electrically coupled to the integrated circuit6via the through electrode210, and the wiring29is electrically coupled to the integrated circuit6via the through electrode220.

As illustrated inFIGS. 1 and 3, the base2is formed with metal layers691and692disposed between the etching stop layer61and the wiring layer63so as to penetrate the insulating layer62. As illustrated inFIG. 4, each of the metal layers691and692, in a plan view of the semiconductor substrate5, has an annular shape surrounding the through electrodes210and220. The wiring layer63is provided with the connection pads631and632coupled to the through electrodes210and220, and in the plan view of the semiconductor substrate5, the metal layer691is included in the connection pad631, and the metal layer692is included in the connection pad632. Therefore, upper ends of the metal layers691and692penetrate the insulating layer62and come into contact with a lower surface of the etching stop layer61, and lower ends of the metal layers691and692penetrate the insulating layer62and come into contact with upper surfaces of the connection pads631and632.

As will be described in the method for manufacturing the resonator device1described later, such metal layers691and692function as guard rings which are etching stop layers when forming the through holes21and22. By providing the metal layers691and692, when the through holes21and22are formed in the insulating layer62by the wet etching, side etching to an outside of the metal layers691and692is restricted, and further unintended side etching can be prevented. Therefore, the wiring pattern failure due to the side etching can be prevented, and the resonator device1has a high reliability.

The lid3, similar to the semiconductor substrate5, is a silicon substrate. Accordingly, linear expansion coefficients of the semiconductor substrate5and the lid3are equal. Therefore, generation of a thermal stress due to thermal expansion is prevented, and the resonator device1has excellent resonating characteristics. In addition, since the resonator device1can be formed by a semiconductor process, the resonator device1can be manufactured with a high accuracy, and the size of the resonator device1can be reduced. However, the lid3is not particularly limited, and may use a semiconductor substrate other than silicon substrate, for example, a Ge, GaP, GaAs, or InP semiconductor substrate. For example, a substrate other than a metal substrate such as a kovar substrate, or a semiconductor substrate such as a glass substrate may be used.

As illustrated inFIG. 1, the lid3includes a bottomed recess31that opens in a lower surface of the lid3and accommodates the resonator component4therein. The lower surface of the lid3is bonded to the upper surface of the base2via a bonding member7. Accordingly, the accommodating portion S, which is a space accommodating the resonator component4, is formed between the lid3and the base2. In the present embodiment, the lid3and the base2are bonded by using diffusion bonding utilizing diffusion between metals. However, a bonding method between the lid3and the base2is not particularly limited.

The accommodating portion S is airtight and in a reduced pressure state, preferably in a state close to a vacuum. Accordingly, viscous resistance is reduced, and oscillation characteristics of the resonator component4are improved. However, an atmosphere of the accommodating portion S is not particularly limited, and may be, for example, an atmosphere in which an inert gas such as nitrogen or Ar is sealed, or may be in an atmospheric pressure state or a pressurized state instead of the reduced pressure state.

As illustrated inFIG. 5, the resonator component4includes a resonator substrate41and an electrode42disposed on a surface of the resonator substrate41. The resonator substrate41includes a thickness-shear resonation mode, and is formed by an AT-cut quartz crystal substrate in the present embodiment. Since the AT-cut quartz crystal substrate has cubic frequency-temperature characteristics, the AT-cut quartz crystal substrate is the resonator component4having excellent temperature characteristics. The electrode42includes an excitation electrode421disposed on an upper surface of the resonator substrate41and an excitation electrode422disposed on a lower surface so as to face the excitation electrode421. The electrode42includes a pair of terminals423and424disposed on the lower surface of the resonator substrate41, a wiring425that electrically couples the terminal423to the excitation electrode421, and a wiring426that electrically couples the terminal424to the excitation electrode422.

A configuration of the resonator component4is not limited to the above configuration. For example, the resonator component4may be a mesa shape in which a resonation region sandwiched between the excitation electrodes421and422protrudes from a periphery of the resonation region, or conversely, may be an inverted mesa shape in which the resonation region is recessed from the periphery of the resonation region. Bevel processing for grinding a periphery of the resonator substrate41and convex processing in which the upper surface and the lower surface are made as convex curve surfaces may be performed.

The resonator component4is not limited to one that resonates in the thickness-shear resonation mode, and for example, may be one in which a plurality of resonating arms are bent and resonate in an in-plane direction like a tuning fork type resonator component. That is, the resonator substrate41is not limited to one formed by the AT-cut quartz crystal substrate, and may be formed by a quartz crystal substrate other than the AT-cut quartz crystal substrate, for example, an X-cut quartz crystal substrate, a Y-cut quartz crystal substrate, a Z-cut quartz crystal substrate, a BT-cut quartz crystal substrate, an SC-cut quartz crystal substrate, and an ST-cut quartz crystal substrate.

A constituent material of the resonator substrate41is not limited to a quartz crystal, and may be formed by, for example, a lithium niobate, lithium tantalate, lithium tetraborate, langasite, potassium niobate, or gallium phosphate monocrystalline piezoelectric body, or may be formed by other monocrystalline piezoelectric bodies. Further, the resonator component4is not limited to a piezoelectric driven type resonator element, and may be an electrostatically driven type resonator element using an electrostatic force.

Such a resonator component4is located at the first surface5aside of the semiconductor substrate5. The resonator component4is bonded to the base2by the pair of metal bumps81and82, and is electrically coupled to the wirings28and29. The metal bumps81and82are stud bumps, plated bumps, or the like. The method for coupling the resonator component4to the base2is not particularly limited, and for example, the resonator component4may be bonded to the base2by a conductive adhesive and may be electrically coupled to the wirings28and29.

A configuration of the resonator device1is described above. Next, a method for manufacturing the resonator device1will be described. The method for manufacturing the resonator device1, as illustrated inFIG. 6, includes a base preparation step S1, a through electrode forming step S2, a resonator component arranging step S3, and a lid arranging step S4. The through electrode forming step S2includes a through hole forming step S21and a conductive material arranging step S22.

Base Preparation Step S1

First, as illustrated inFIG. 7, the base2is prepared. At this stage, the through electrodes210and220and the wirings28and29are not formed at the base2. That is, the base2includes the semiconductor substrate5, the integrated circuit6provided at the second surface5bside of the semiconductor substrate5, and the annular metal layers691and692formed in the integrated circuit6. The etching stop layer61is made of silicon nitride (SiN), and the insulating layers62and64are made of silicon oxide (SiO2). The wiring layers63and65, the terminal layer68, and the metal layers691and692are each made of aluminum (Al), and the passivation film67is made of polyimide. However, the constituent materials of the respective layers are not particularly limited as long as the layers can exhibit their functions.

Through Electrode Forming Step S2

Through Hole Forming Step S21

Next, as illustrated inFIG. 8, the through holes211and221that penetrate the semiconductor substrate5in the thickness direction are formed. The through holes211and221are formed by the dry etching, especially by a Bosch method. Accordingly, the through holes211and221having a high aspect ratio can be formed. The etching stop layer61functions as a stop layer for the dry etching. In particular, by forming the etching stop layer61with SiN (silicon nitride), the etching stop layer61has a high selectivity for the dry etching, and over-etching can be effectively prevented. Therefore, for example, the through holes211and221can be effectively prevented from reaching the wiring layer63and causing the plasma damage to the wiring layer63. As a result, the wiring pattern failure due to the dry etching can be prevented, and the resonator device1having a high reliability can be manufactured.

Next, as illustrated inFIG. 9, digging is performed from lower ends of the through holes211and221to form through holes212and222that penetrate the etching stop layer61in the thickness direction. The through holes212and222are formed by the dry etching. However, the present disclosure is not limited thereto, and the through holes212and222may be formed by the wet etching.

Next, as illustrated inFIG. 10, digging is performed from lower ends of the through hole212and222to form through holes213and223that pass through an inside of the metal layers691and692and penetrate the insulating layer62in the thickness direction. The through holes213and223are formed by the wet etching. By forming the through holes213and223by the wet etching, the plasma damage to the wiring layer63as in a case of forming the through holes213and223by the dry etching does not occur. Therefore, the wiring pattern failure due to the dry etching can be prevented. Instead, in the wet etching, the side etching may occur, resulting in the wiring pattern failure due to the wet etching. However, in the present embodiment, since the through holes213and223pass through the inside of the metal layers691and692, the metal layers691and692further restrict the side etching to the outside. Therefore, the unintended side etching is prevented. As a result, the wiring pattern failure due to the side etching is prevented, and the resonator device1having a high reliability can be manufactured.

In particular, in the present embodiment, in the plan view of the semiconductor substrate5, the metal layers691and692are included in the connection pads631and632, and the lower ends of the metal layers691and692come into contact with the upper surfaces of the connection pads631and632. Therefore, entering of an etching solution to the outside of the metal layers691and692can be effectively prevented, and the unintended side etching can be effectively prevented. As a result, the wiring pattern failure due to the wet etching can be more effectively prevented.

By the above steps, the through holes21and22are formed from the first surface5athrough the inside of the metal layers691and692to the connection pads631and632of the wiring layer63. According to the method for forming the through holes21and22as described above, the plasma damage to the wiring layer63and the wiring pattern failure due to the side etching can be prevented, and the through holes21and22having a high aspect ratio can be formed. Therefore, the highly reliable and compact resonator device1can be manufactured.

Conductive Material Arranging Step S22

Next, as illustrated inFIG. 11, the insulating film is formed on the first surface5aof the semiconductor substrate5and inner surfaces of the through holes21and22. The method for forming the insulating film50is not particularly limited, and for example, chemical vapor deposition (CVD) can be used. Next, as illustrated inFIG. 12, the insulating film50formed on bottom surfaces of the through holes21and22is removed by etching to expose the connection pads631and632in the through holes21and22.

Next, the conductive material E is disposed in a film shape on the first surface5aand filled in the through holes21and22. Then, the conductive material E on the first surface5ais patterned by etching. Accordingly, as illustrated inFIG. 13, the wirings28and29and the through electrodes210and220are collectively formed. The conductive material E is not particularly limited, and for example, the same material as the wiring layer63can be used. Accordingly, an affinity between the through electrodes210and220and the wiring layer63is enhanced, and contact failure or the like between the through electrodes210and220and the wiring layer63can be effectively prevented. Since the materials can be shared, manufacturing cost of the resonator device1can be reduced. However, the conductive material E is not particularly limited, and for example, a stacked structure of titanium-tungsten alloy (TiW)/copper (Cu)/gold (Au) may be used.

Resonator Component Arranging Step S3

Next, the resonator component4is mounted on the wirings28and29via the metal bumps81and82.

Lid Arranging Step S4

Next, the lid3is bonded to the upper surface of the base2. Accordingly, as illustrated inFIG. 14, the resonator device1is manufactured.

The resonator device1and the method for manufacturing the resonator device1are described in detail above. As described above, such a resonator device1includes the base2and the resonator component4disposed on the base2. The base2includes the semiconductor substrate5having the first surface5aand the second surface5bthat are in the front-to-back relation with each other; the integrated circuit6that includes the wiring layer63disposed at the second surface5bside and having the connection pads631and632and includes the insulating layer62disposed between the second surface5band the wiring layer63; the through electrodes210and220that penetrate the semiconductor substrate5and the insulating layer62and are coupled to the connection pads631and632; and the annular metal layers691and692that are disposed so as to penetrate the insulating layer62between the second surface5band the wiring layer63and surround the through electrodes210and220in the plan view of the semiconductor substrate5. According to the resonator device1having such a configuration, even if the through holes213and223penetrating the insulating layer62are formed by the wet etching, the metal layers691and692function as the guard rings, and further side etching is restricted. Therefore, for example, the plasma damage as in the case of the dry etching is not given to the wiring layer63, and the wiring pattern failure due to the side etching is prevented. Therefore, the resonator device1has a high reliability.

As described above, in the plan view of the semiconductor substrate5, the metal layers691and692are included in the connection pads631and632. As a result, the entering of the etching solution to the outside of the metal layers691and692can be more effectively prevented, and the wiring pattern failure due to the side etching can be more effectively prevented.

As described above, the integrated circuit6includes the plurality of wiring layers63and65stacked in the thickness direction of the semiconductor substrate5, and the through electrodes210and220are coupled to the connection pads631and632included in the wiring layer63, located closest to the semiconductor substrate5side, among the plurality of wiring layers63and65. Accordingly, the through electrodes210and220can be shortened as much as possible, and the through electrodes210and220can be easily formed.

As described above, the base2is disposed between the second surface5band the insulating layer62and includes the etching stop layer61made of SiN. Accordingly, when the semiconductor substrate5is dry-etched to form the through holes211and221, over-etching can be prevented, and the plasma damage to the wiring layer63can be effectively prevented.

As described above, the wiring layer63and the through electrodes210and220are made of the same material. Accordingly, the affinity between the through electrodes210and220and the wiring layer63is enhanced, and contact failure or the like between the through electrodes210and220and the wiring layer63can be effectively prevented. Since the material can be shared, the manufacturing cost of the resonator device1can be reduced.

As described above, the resonator component4is disposed at the first surface5aside of the semiconductor substrate5. The resonator device1includes the lid3for accommodating the resonator component4between the lid3and the base2. Accordingly, the resonator component4can be protected. By forming the integrated circuit6at the second surface5bside, as compared with the case where the integrated circuit6is formed at the first surface5a, the wide space for forming the integrated circuit6can be secured since no bonding region with the lid3exists.

As described above, the method for manufacturing the resonator device1includes the base preparation step S1of preparing the base2that includes the semiconductor substrate5having the first surface5aand the second surface5bthat are in the front-to-back relation with each other, the integrated circuit6that includes the wiring layer63disposed at the second surface5bside and including the connection pads631and632and includes the insulating layer62disposed between the second surface5band the wiring layer63, and the annular metal layers691and692that are disposed so as to penetrate the insulating layer62between the second surface5band the wiring layer63; and the through electrode forming step S2of forming the through electrodes210and220penetrating the semiconductor substrate5and the insulating layer62and coupled to the connection pads631and632through the inside of the metal layers691and692. The through electrode forming step S2includes the through hole forming step S21of forming the through holes21and22from the first surface5ato the connection pads631and632through the inside of the metal layers691and692by penetrating the semiconductor substrate5by the dry etching and then penetrating the insulating layer62by the wet etching, and the conductive material arranging step S22of disposing the conductive material E in the through holes21and22to form the through electrodes210and220. According to such a method, even if the through holes213and223penetrating the insulating layer62are formed by the wet etching, the metal layers691and692function as the guard rings, and further side etching is restricted. Therefore, for example, the plasma damage as in the case of the dry etching is not given to the wiring layer63, and the wiring pattern failure due to the side etching is prevented. Therefore, the resonator device1has a high reliability.

As described above, the base2is disposed between the second surface5band the insulating layer62and includes the etching stop layer61made of SiN. Accordingly, when the semiconductor substrate5is dry-etched to form the through holes211and221, over-etching can be prevented, and the plasma damage to the wiring layer63can be effectively prevented.

Second Embodiment

FIG. 15is a vertical cross-sectional view illustrating a resonator device according to a second embodiment.

The resonator device1according to the present embodiment, except that the configuration of the base2is different, is the same as the resonator device1according to the first embodiment described above. In the following description, the present embodiment will be described with a focus on the difference from the above embodiment, and a description of similar matters will be omitted. InFIG. 15, the same reference numerals are given to configurations similar to those according to the above embodiment.

As illustrated inFIG. 15, the base2according to the present embodiment is upside down with respect to the first embodiment described above, and the integrated circuit6is formed at the upper surface side, that is, the second surface5bside of the semiconductor substrate5. The resonator component4is disposed at the upper surface side of the semiconductor substrate5, and the resonator element4and the integrated circuit6are bonded via the pair of metal bumps81and82. The integrated circuit6, in order to secure a bonding space with the lid3on the second surface5bof the semiconductor substrate5, is formed to be slightly smaller than the base2so as to exclude an outer peripheral portion of the second surface5b. According to such a configuration, the integrated circuit6can be accommodated and protected in the accommodating portion S together with the resonator component4.

In the terminal layer68of the integrated circuit6, in place of the mounting terminals681in the first embodiment described above, wirings682and683that electrically couple the resonator component4to the wiring layer65are disposed. At the first surface5aside of the semiconductor substrate5, a plurality of mounting terminals26are disposed in place of the wirings28and29described above. The respective mounting terminals26pass through an annular metal layer693formed through the insulating layer62and are electrically coupled to the integrated circuit6via the through electrode230passing through the semiconductor substrate5, the etching stop layer61, and the insulating layer62. The through electrode230has the same configuration as the through electrodes210and220in the first embodiment described above, and the metal layer693has the same configuration as the metal layers691and692in the first embodiment described above. Moreover, the through electrode230and the metal layer693are formed by the same method as in the first embodiment described above.

As described above, in the resonator device1according to the present embodiment, the resonator component is disposed at the second surface5bside of the semiconductor substrate5. The resonator device1includes the lid3for accommodating the resonator component4and the integrated circuit6between the lid3and the base2. Accordingly, the resonator component4and the integrated circuit6can be protected.

According to such a second embodiment, the same effect as that of the first embodiment described above can also be exerted.

Third Embodiment

FIG. 16is a horizontal cross-sectional view illustrating a metal layer included in a resonator device according to a third embodiment.

The resonator device1according to the present embodiment, except that the configurations of the metal layers691and692are different, is the same as the resonator device1according to the first embodiment described above. In the following description, the present embodiment will be described with a focus on differences from the above embodiments, and a description of similar matters will be omitted. InFIG. 16, the same reference numerals are given to configurations similar to those according to the above embodiments.

As illustrated inFIG. 16, the resonator device1according to the present embodiment includes a plurality of concentrically arranged metal layers691. Specifically, the plurality of metal layers691include a first metal layer691alocated at an innermost position and surrounding the through electrode210, a second metal layer691blocated outside the first metal layer691aand surrounding the first metal layer691a, and a third metal layer691clocated outside the second metal layer691band surrounding the second metal layer691b. According to such a configuration, the triple metal layers691can prevent an etching solution from leaking, and thus the wiring pattern failure due to the side etching can be more reliably prevented. However, the number of the metal layers691is not particularly limited, and may be two or four or more.

Similarly, the resonator device1according to the present embodiment includes a plurality of concentrically arranged metal layers692. Specifically, the plurality of metal layers692include a first metal layer692alocated at an innermost position and surrounding the through electrode220, a second metal layer692blocated outside the first metal layer692aand surrounding the first metal layer692a, and a third metal layer692clocated outside the second metal layer692band surrounding the second metal layer692b. According to such a configuration, the triple metal layers692can prevent the etching solution from leaking, and thus the wiring pattern failure due to the side etching can be more reliably prevented. However, the number of the metal layers692is not particularly limited, and may be two or four or more.

As described above, in the resonator device1according to the present embodiment, the metal layers691and692include the first metal layers691aand692asurrounding the through electrodes210and220and the second metal layers691band692bsurrounding the first metal layers691aand692a. Accordingly, the wiring pattern failure due to the side etching can be more reliably prevented.

According to such a third embodiment, the same effect as in the first embodiment described above can also be exerted.

Although the resonator device of the present disclosure and the method for manufacturing the resonator device are described above based on the illustrated embodiments, the present disclosure is not limited thereto, and the configuration of each unit can be replaced with an optional configuration having the same function. Further, any other constituents may be added to the present disclosure. Each of the embodiments may be combined as appropriate.