CN216303264U

CN216303264U - Airtight packaging structure of device with cavity

Info

Publication number: CN216303264U
Application number: CN202121914640.5U
Authority: CN
Inventors: 黄黎; 丁希聪; 凌方舟; 刘尧
Original assignee: Meixin Semiconductor Tianjin Co ltd
Current assignee: Meixin Semiconductor Tianjin Co ltd
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2022-04-15
Anticipated expiration: 2031-08-16

Abstract

The utility model provides an airtight packaging structure with a cavity device, which comprises: a semiconductor component; a cover plate; a bonding layer located between the semiconductor component and the cover plate to bond the semiconductor component and the cover plate together; a first cavity located between the semiconductor component and the cover plate, surrounded by the bonding layer and completely sealed; the second cavity is positioned between the semiconductor component and the cover plate, positioned on one side of the first cavity and surrounded by the bonding layer and partially sealed; a communication hole communicating the second cavity and not completely sealed by the bonding layer; and the sealing part is formed by melting and is used for sealing the communication hole, so that the second cavity is completely sealed. Compared with the prior art, the utility model can package MEMS devices with different working gas pressures and/or different gas composition requirements on the same wafer, realize the integration of multiple MEMS devices, reduce the size of a sensing system and reduce the manufacturing cost.

Description

Airtight packaging structure of device with cavity

[ technical field ] A method for producing a semiconductor device

The utility model belongs to the field of Micro-Electro-Mechanical System (MEMS) devices, and particularly relates to an airtight packaging structure with a cavity device, which can package MEMS with different working air pressure requirements and/or different gas composition requirements on the same wafer.

[ background of the utility model ]

Like integrated circuit ICs, MEMS sensors and actuators are also moving towards high performance, miniaturization and low cost and integration. The traditional packaging method adopts a single gas sealing pressure, and the ideal working pressure of different types of MEMS devices is different, such as a MEMS accelerometer, so that the working pressure is higher in order to keep high performance and reliability. And for the MEMS gyroscope, the working air pressure is lower in order to ensure high sensitivity and low power consumption. The current packaging mode can not meet the packaging requirements of different air pressures when packaging different types of MEMS devices on the same wafer.

Therefore, it is necessary to provide a technical solution to overcome the above problems.

[ Utility model ] content

One of the objectives of the present invention is to provide an airtight package structure with a cavity device, which can package MEMS devices with different working pressures and/or different gas composition requirements on the same wafer, thereby achieving integration of multiple MEMS devices, reducing the size of a sensing system, and reducing the manufacturing cost.

According to an aspect of the present invention, there is provided a hermetic package structure with a cavity device, comprising: a semiconductor component; a cover plate; a bonding layer between the semiconductor component and the cover plate to bond the semiconductor component and the cover plate together; a first cavity between the semiconductor component and the cover plate, surrounded by the bonding layer and completely sealed; a second cavity between the semiconductor component and the cover plate, the second cavity being located on one side of the first cavity, the second cavity being surrounded by the bonding layer and partially sealed; a communication hole communicating the second cavity without being completely sealed by the bonding layer; and a sealing part formed by melting and used for sealing the communication hole so that the second cavity is completely sealed.

Compared with the prior art, the semiconductor component and the cover plate are bonded to completely seal the first cavity and partially seal the second cavity, and the second cavity is communicated with the external environment through the communicating hole; and then, the communication hole is sealed by melting the communication hole so as to realize complete sealing of the second cavity, wherein the first cavity and the second cavity have different gas types besides different gas pressures, and the gas pressure and the components of the packaging environment gas can be adjusted to realize the complete sealing of the second cavity. Therefore, the MEMS device with different working gas pressures and/or different gas composition requirements can be packaged on the same wafer, the integration of multiple MEMS devices is realized, the size of a sensing system is reduced, and the manufacturing cost is reduced.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

fig. 1 is a partial longitudinal cross-sectional view of a semiconductor component 100 provided in one embodiment of the present invention;

FIG. 2a is a partial top view of a cover plate 210 provided in one embodiment of the present invention;

FIG. 2b is a partial longitudinal cross-sectional view of the cover plate shown in FIG. 2a taken along a mid-line 201 in one embodiment of the present invention;

FIG. 3 is a partial longitudinal cross-sectional view of a bonding structure formed by bonding the semiconductor component shown in FIG. 1 and the cover plate shown in FIGS. 2a and 2b according to a first embodiment of the present invention;

FIG. 4 is a partial longitudinal cross-sectional view of a hermetic package formed after fusing a communication hole to the bonded structure shown in FIG. 3 in one embodiment of the present invention;

FIG. 5 is a partial longitudinal cross-sectional view of a bonded structure formed after bonding a semiconductor component and a cover plate in a second embodiment of the present invention;

FIG. 6 is a partial longitudinal cross-sectional view of a hermetic package formed after fusing a communication hole to the bonded structure shown in FIG. 5 in one embodiment of the present invention;

FIG. 7 is a partial longitudinal cross-sectional view of a bonded structure formed after bonding a semiconductor component and a lid plate in a third embodiment of the present invention;

FIG. 8 is a partial longitudinal cross-sectional view of a bonded structure formed after bonding a semiconductor component and a lid plate in a fourth embodiment of the present invention;

fig. 9 is a flow chart of a method of manufacturing a hermetically sealed package structure with a cavity device in accordance with the present invention in one embodiment.

[ detailed description ] embodiments

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the utility model. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Unless otherwise specified, the terms connected, and connected as used herein mean electrically connected, directly or indirectly.

Fig. 9 is a flow chart of a method for manufacturing a hermetic package structure with a cavity device according to an embodiment of the present invention. The manufacturing method includes the following steps.

Step 10, as shown in fig. 1, 2a and 2b, provides a semiconductor component 100 and a cover plate 210. Fig. 1 is a partial longitudinal cross-sectional view of a semiconductor component 100 provided in one embodiment of the present invention;

FIG. 2a is a partial top view of a cover plate 210 provided in one embodiment of the present invention; fig. 2b is a partial longitudinal cross-sectional view of the cover plate shown in fig. 2a along a middle line 201 in an embodiment of the present invention.

In the embodiment shown in fig. 1, the semiconductor component 100 comprises: a first surface 150, a second surface 160 opposite the first surface 150, a first MEMS device (i.e., MEMS1)130, a second MEMS device (i.e., MEMS2)131, and a trench 140. Wherein the first micro-electro-mechanical system device (i.e., MEMS1)130 and the second micro-electro-mechanical system device (i.e., MEMS2)131 are located on the first surface 150 of the semiconductor component 100 and are spaced apart along the first surface 150 of the semiconductor component 100; the trench 140 is formed in the first surface 150 of the semiconductor component 100 and is located outside (or around) the second MEMS device (i.e., MEMS2) 131.

In the specific embodiment shown in fig. 1, the semiconductor component 100 further includes a substrate 110 and a first structural layer 120 located above the substrate 110, a side surface of the first structural layer 120 away from the substrate 110 is a first surface 150 of the semiconductor component 100, a side surface of the substrate 110 away from the first structural layer 120 is a second surface 160 of the semiconductor component 100, and a first MEMS device (i.e., MEMS1)130 and a second MEMS device (i.e., MEMS2)131 are located above and spaced along a side surface of the first structural layer 120 away from the substrate 110 (i.e., the first surface 150 of the semiconductor component 100); the trench 140 is formed on a side surface of the first structural layer 120 away from the substrate 110 and outside (or around) the second MEMS device (i.e., MEMS2) 131.

The substrate 110 is a semiconductor substrate layer, typically a silicon wafer, used in the fabrication of circuits and MEMS structures. The first structure layer 120 may be a circuit layer or a dielectric layer. Trenches 140 may be etched into first structural layer 120. The first MEMS device (i.e., MEMS1)130 and the second MEMS device (i.e., MEMS2)131 may be different types of devices that require different working gas pressures and/or working gas compositions, such as the first MEMS device (i.e., MEMS1)130 being a gyroscope and the second MEMS device (i.e., MEMS2) being an accelerometer, or vice versa.

In the embodiment shown in fig. 2a and 2b, the cover plate 210 comprises a first surface 250, a second surface 260 opposite the first surface 250, and a first recess 211 and a second recess 212. The first grooves 211 and the second grooves 212 are formed on the first surface 250 of the cover plate 210 and are arranged at intervals along the first surface 250 of the cover plate 210; a bonding layer 220 is formed over the first surface 250 of the cap plate 210, the bonding layer 220 completely surrounding the first recess 211 and partially surrounding the second recess 212 (or the bonding layer 220 surrounding the first recess 211 and the second recess 212, respectively). In fig. 2a, 201 and 202 are the middle lines. The bonding layer 220 is used for wafer bonding, and may be implemented by thin film deposition or the like. The first recess 211 and the second recess 212 may be formed by dry etching or wet etching. The cover plate 210 may be a silicon wafer or glass.

Step 20, as shown in fig. 3, in a first packaging environment, the first surface 150 of the semiconductor component 100 and the first surface 250 of the cover plate 210 are opposite to each other, and the semiconductor component 100 and the cover plate 210 are bonded together through the bonding layer 220 located between the first surface 150 of the semiconductor component 100 and the first surface 250 of the cover plate 210 to form a bonding structure 300. Fig. 3 is a partial longitudinal sectional view of a bonding structure formed by bonding the semiconductor component shown in fig. 1 and the cover plate shown in fig. 2a and 2b according to a first embodiment of the present invention. Wherein a first cavity a, a second cavity B and a communication hole C are formed between the first surface 150 of the semiconductor component 100 and the first surface 250 of the cap plate 210, the first cavity a being surrounded by the bonding layer 220 and completely sealed; the second cavity B is surrounded and partially sealed by the bonding layer 220; the communication hole C communicates the second chamber B with the outside.

The semiconductor component 100 and the cap plate 210 may be bonded using adhesive/anodic bonding, metal bonding, hybrid metal/polymer wafer bonding, and the like. The gas pressure and the gas composition of the completely sealed first cavity a are adjusted by adjusting the gas pressure and the gas composition of the first package environment, for example, the gas pressure in the first cavity a is determined by the gas pressure when the semiconductor component 100 and the lid 210 are bonded and other process parameters in the process.

In the specific embodiment shown in fig. 3, the diameter of the cap plate 210 is smaller than the diameter of the semiconductor component 100, and after the cap plate 210 and the semiconductor component 100 are bonded, the edge of the cap plate 210 is located inside the edge of the semiconductor component 100, i.e., a step is formed at the edge of the bonded structure 300. When the semiconductor component 100 and the lid 210 are bonded together, the first recess 211 is snap-fit with the first surface 150 of the semiconductor component 100 in (or around) the area of the first MEMS device (i.e., MEMS1)130 to form a first cavity a, in which the first MEMS device (i.e., MEMS1)130 is received; the second recess 212 is engaged with the first surface 150 of the semiconductor component 100 in (or around) the area where the second MEMS device (i.e., MEMS2)131 is located to form a second cavity B, in which the second MEMS device (i.e., MEMS2)131 is received. The trench 140 formed on the first surface 150 of the semiconductor component 100 and located outside the second MEMS device (i.e., MEMS2)131 is opposite to the sidewall of the second groove 212 of the cover plate 210, and a communication hole C communicating the second cavity B with the outside is formed in a space surrounded by the trench 140 and the opposite sidewall of the second groove 212. That is, when the semiconductor component 100 and the cover plate 210 are bonded together, the first MEMS device (i.e., the MEMS1)130 is sealed in the first cavity a, the second MEMS device (i.e., the MEMS2)131 is located in the second cavity B, and after bonding, the second cavity B is still in communication with the outside through the communication hole C. The communication hole C is used to adjust the gas pressure and gas composition of the second chamber B.

In the specific embodiment shown in fig. 3, the bonding layer 220 bonds a side surface of the first structure layer 120 remote from the substrate 110 (i.e., the first surface 150 of the semiconductor component 100) and the first surface 250 of the cap plate 210 together; the sidewall of the second groove 212 opposite to the groove 140 is located above the groove 140, specifically, see the dashed-line frame part at the lower right corner of fig. 3, the dashed-line frame part is a top view of the groove 140 in one embodiment, as seen from the top view, the groove 140 crosses the thickness direction of the sidewall of the second groove 212 opposite to the groove 140, one end of the groove 140 is located at one side of the sidewall of the second groove 212 opposite to the groove 140 and communicates with the second cavity B, and the other end of the groove 140 is located at the other side of the sidewall of the second groove 212 opposite to the groove 140 and communicates with the external environment; the trench 140 may be one trench 1401 or a plurality of trenches 1402 arranged in parallel. In fig. 3, the 3 grooves 1402 are only illustrated, and actually, the grooves are not limited to the 3 grooves 1402.

Step 30, as shown in fig. 4, in the second packaging environment, the second cavity B is completely sealed by melting the communication hole C to form a sealing part 430 for sealing the communication hole C. Fig. 4 is a partial longitudinal cross-sectional view of a hermetic package structure formed after fusing communication holes to the bonded structure shown in fig. 3 according to an embodiment of the present invention. In the embodiment shown in fig. 4, the communicating hole C is locally heated by the pulsed laser 420, wherein the sidewall of the trench 140 and the sidewall of the second recess 212 forming the communicating hole C need to be thick enough to prevent the sidewall from being damaged when the pulsed laser 420 is heated. The pulsed laser 420 is angled with respect to the substrate 110 to melt the cover plate 210 material and the first structural layer 120 material near the via C, causing them to fuse together and prevent damage or heating elsewhere; and the pulse width of the pulsed laser 420 is sufficiently short. 430 is a schematic view of a sealing part formed by fusing upper and lower layer materials of the communicating hole C through local heating by laser pulses, and the sealing part 430 seals the communicating hole C, thereby realizing sealing of the second cavity B. The gas pressure and the gas composition of the completely sealed second cavity B are adjusted by adjusting the gas pressure and the gas composition of the second package environment, for example, the gas pressure of the completely sealed second cavity B may be determined by the gas pressure of the second package environment when the laser pulse is emitted. The air pressure of the completely sealed first cavity a is greater than the air pressure of the completely sealed second cavity B, and may also be less than the air pressure of the completely sealed second cavity B, which may be determined by adjusting the air pressure during bonding (i.e., the first sealing environment) and during melting the communication hole C (or the second sealing environment). In one embodiment, the MEMS device in the lower air pressure cavity A, B may be a gyroscope, filter, oscillator, etc., and the MEMS device in the higher air pressure cavity A, B may be an accelerometer, pressure sensor, infrared sensor, etc.

Fig. 5 is a partial longitudinal cross-sectional view of a bonding structure formed by bonding a semiconductor component and a cover plate according to a second embodiment of the present invention.

The structure of the cover plate 210 shown in fig. 5 is the same as that of the cover plate 210 shown in fig. 3, and for details, reference is made to the description of the cover plate 210 shown in fig. 3, and details are not repeated here.

The semiconductor component 100-1 shown in fig. 5 is substantially the same in structure as the semiconductor component 100 shown in fig. 3, with the main difference that the semiconductor component 100-1 shown in fig. 5 further includes a second structure layer 510; the trench 240 is formed in the second structural layer 510. Specifically, the semiconductor component 100-1 shown in fig. 5 includes: a substrate 110, a first structural layer 120, a second structural layer 510, a first microelectromechanical system device (i.e., MEMS1)130, a second microelectromechanical system device (i.e., MEMS2)131, and a trench 240. Wherein the first structural layer 120 is located above the substrate 110; the first micro-electro-mechanical system device (i.e., MEMS1)130 and the second micro-electro-mechanical system device (i.e., MEMS2)131 are located above and spaced along a surface of the first structural layer 120 on a side away from the substrate 110; the second structural layer 510 is located above the first structural layer 120 and surrounds the first MEMS device (i.e., MEMS1)130 and the second MEMS device (i.e., MEMS2), respectively; a surface of the second structure layer 510 away from the first structure layer 120 is a first surface (not shown) of the semiconductor component 100, and a surface of the substrate 110 away from the first structure layer 120 is a second surface (not shown) of the semiconductor component 100.

In the specific embodiment shown in fig. 5, the bonding layer 220 bonds a side surface of the second structural layer 510 remote from the first structural layer 120 (i.e., the first surface of the semiconductor component 100) and the first surface of the cap plate 210 together; the trench 240 is formed on a side surface of the second structural layer 510 away from the substrate 110 (i.e., the first surface of the semiconductor component 100) and outside (or around) the second MEMS device (i.e., the MEMS2) 131; the side wall of the second groove 212 opposite to the groove 240 is located above the groove 240, specifically, see the dashed-line frame part at the lower right corner of fig. 5, the dashed-line frame part is a top view of the groove 240 in one embodiment, as seen from the top view, the groove 240 crosses the thickness direction of the side wall of the second groove 212 opposite to the groove 240, one end of the groove 240 is located at one side of the side wall of the second groove 212 opposite to the groove 240 and communicates with the second cavity B, and the other end of the groove 240 is located at the other side of the side wall of the second groove 212 opposite to the groove 240 and communicates with the external environment; the groove 240 may be one groove 2401 or a plurality of grooves 2402 arranged in parallel. In fig. 5, the 3 grooves 2402 are only illustrated, and actually, the grooves are not limited to the 3 grooves 2402.

Fig. 6 is a partial longitudinal cross-sectional view of a hermetic package structure formed after fusing communication holes to the bonded structure shown in fig. 5 in one embodiment of the present invention. As shown in fig. 6, in the second packaging environment, the second cavity B is completely sealed by melting the communication hole C to form a sealing portion 430 sealing the communication hole C. In the embodiment shown in fig. 6, the communicating hole C is locally heated by the pulsed laser 420, wherein the sidewall of the trench 140 and the sidewall of the second recess 212 forming the communicating hole C need to be thick enough to prevent the sidewall from being damaged when the pulsed laser 420 is heated. The pulsed laser 420 is angled with respect to the substrate 110 to melt the material of the cover plate 210 and the material of the second structural layer 510 near the via C, so that they are fused together and prevent damage or heating of other parts; and the pulse width of the pulsed laser 420 is sufficiently short and the power is sufficiently high.

Fig. 7 is a partial longitudinal sectional view of a bonding structure formed by bonding a semiconductor component and a cover plate according to a third embodiment of the present invention.

The structure of the cover plate 210 shown in fig. 7 is the same as that of the cover plate 210 shown in fig. 3, and for details, reference is made to the description of the cover plate 210 shown in fig. 3, and details are not repeated here.

The semiconductor component 100-2 shown in fig. 7 is substantially the same in structure as the semiconductor component 100 shown in fig. 3, with the main difference that the semiconductor component 100-2 shown in fig. 7 further includes a second structure layer 710; the trench 340 is formed in the second structural layer 710, and a sidewall of the second recess 212 opposite to the trench 340 is suspended within the trench 340. Specifically, the semiconductor component 100-2 shown in fig. 7 includes: a substrate 110, a first structural layer 120, a second structural layer 710, a first microelectromechanical system device (i.e., MEMS1)130, a second microelectromechanical system device (i.e., MEMS2)131, and a trench 340. Wherein the first structural layer 120 is located above the substrate 110; the first micro-electro-mechanical system device (i.e., MEMS1)130 and the second micro-electro-mechanical system device (i.e., MEMS2)131 are located above and spaced along a surface of the first structural layer 120 on a side away from the substrate 110; the second structural layer 710 is located above the first structural layer 120 and surrounds only a second MEMS device (i.e., MEMS 2); a side surface of the second structure layer 710 away from the first structure layer 120, and a portion of a side surface of the first structure layer 120 away from the substrate 110, which is not covered by the second structure layer 710, constitutes a first surface (not identified) of the semiconductor component 100-2, and a side surface of the substrate 110 away from the first structure layer 120 is a second surface (not identified) of the semiconductor component 100.

In the particular embodiment shown in fig. 7, bonding layer 220 bonds together a side surface of the second structural layer 710 remote from the first structural layer 120 (which is the first surface of semiconductor component 100-2); the trench 340 is formed on a side surface of the second structural layer 710 away from the substrate 110 (which belongs to the first surface of the semiconductor component 100-2) and is located outside (or around) the second MEMS device (i.e., MEMS2) 131; the sidewall of the second groove 212 opposite to the trench 340 is suspended in the trench 340, specifically, please refer to the dashed-line frame portion at the lower right corner of fig. 7, which is a top view of the trench 340 in one embodiment, as can be seen from fig. 7, the trench 340 penetrates through the second structural layer 710; the side wall of the second groove 212 opposite to the groove 340 is suspended in the groove 340, and a communication hole C for communicating the second cavity B with the outside is formed in a space surrounded by the groove 340 and the opposite side wall of the second groove 212.

Next, in the second packaging environment, the communication hole C of the bonding structure shown in fig. 7 may be locally heated by the pulsed laser 420 to form a sealing portion that seals the communication hole C, so that the second cavity B is completely sealed.

Fig. 8 is a partial longitudinal cross-sectional view of a bonding structure formed by bonding a semiconductor component and a cover plate according to a fourth embodiment of the present invention.

The semiconductor component 100-2 shown in fig. 8 has the same structure as the semiconductor component 100-2 shown in fig. 7, and will not be described again.

The cover plate 210-1 shown in fig. 8 has substantially the same structure as the cover plate 210 shown in fig. 7, and differs therefrom mainly in that the sidewall portions 810 of the second recess 212 opposite to the trenches 840 are shorter than the other sidewall portions of the second recess 212, and the short sidewall portions 810 can be realized by means of secondary etching; and after wafer bonding, the short sidewalls 810 of the second recess 212 opposite the trench 840 are located above the trench 840.

As can be seen from the above embodiments, the

trenches

140, 240, 340, 840 may be formed in a first structural layer 120, the first structural layer 120 being located below the first MEMS device (i.e., MEMS1)130, the second MEMS device (i.e., MEMS2) 131; the

trenches

140, 240, 340, 840 may also be formed in the second

structural layer

510, 710, and the second

structural layer

510, 710 may be in the same layer as the first MEMS device (i.e., MEMS1)130 and the second MEMS device (i.e., MEMS2) 131.

Next, in the second packaging environment, the communication hole C of the bonding structure shown in fig. 8 may be locally heated by the pulsed laser 420 to form a sealing portion that seals the communication hole C, so that the second cavity B is completely sealed.

According to another aspect of the present invention, a hermetic package structure with a cavity device is provided.

The hermetic package structure 400 with cavity device shown in fig. 4 includes a bonding structure 300 and a sealing part 430. The bonding structure 300 includes the semiconductor component 100, the cap plate 210, the bonding layer 220, the first cavity a, the second cavity B, and the communication hole C.

In the embodiment shown in fig. 4, the semiconductor component 100 includes: a first surface 150, a second surface 160 opposite the first surface 150, a first MEMS device (i.e., MEMS1)130, a second MEMS device (i.e., MEMS2)131, and a trench 140. Wherein the first micro-electro-mechanical system device (i.e., MEMS1)130 and the second micro-electro-mechanical system device (i.e., MEMS2)131 are located on the first surface 150 of the semiconductor component 100 and are spaced apart along the first surface 150 of the semiconductor component 100; the trench 140 is formed in the first surface 150 of the semiconductor component 100 and is located outside (or around) the second MEMS device (i.e., MEMS2) 131.

In the specific embodiment shown in fig. 4, the semiconductor component 100 further includes a substrate 110 and a first structural layer 120 located above the substrate 110, a side surface of the first structural layer 120 away from the substrate 110 is a first surface 150 of the semiconductor component 100, a side surface of the substrate 110 away from the first structural layer 120 is a second surface 160 of the semiconductor component 100, and a first MEMS device (i.e., MEMS1)130 and a second MEMS device (i.e., MEMS2)131 are located above and spaced along a side surface of the first structural layer 120 away from the substrate 110 (i.e., the first surface 150 of the semiconductor component 100); the trench 140 is formed on a side surface of the first structural layer 120 away from the substrate 110 and outside (or around) the second MEMS device (i.e., MEMS2) 131. The substrate 110 is a semiconductor substrate layer, typically a silicon wafer, used in the fabrication of circuits and MEMS structures. The first structure layer 120 may be a circuit layer or a dielectric layer. Trenches 140 may be etched into first structural layer 120. The first MEMS device (i.e., MEMS1)130 and the second MEMS device (i.e., MEMS2)131 may be different types of devices that require different working gas pressures and/or working gas compositions, such as the first MEMS device (i.e., MEMS1)130 being a gyroscope and the second MEMS device (i.e., MEMS2) being an accelerometer, or vice versa.

In the embodiment shown in fig. 4, the cap plate 210 includes a first surface 250, a second surface 260 opposite the first surface 250, and a first recess 211 and a second recess 212. The first grooves 211 and the second grooves 212 are formed on the first surface 250 of the cover plate 210 and are spaced along the first surface 250 of the cover plate 210. The bonding layer 220 is located between the first surface 150 of the semiconductor component 100 and the first surface 250 of the cover plate 210 to bond the first surface 150 of the semiconductor component 100 and the first surface 250 of the cover plate 210 together. The bonding layer 220 is used for wafer bonding, and may be implemented by thin film deposition or the like. The first recess 211 and the second recess 212 may be formed by dry etching or wet etching. The cover plate 210 may be a silicon wafer or glass. The first cavity a is located between the first surface 150 of the semiconductor component 100 and the first surface 250 of the cap plate 210, and is completely surrounded and completely sealed by the bonding layer 220; a second cavity B is located between the first surface 150 of the semiconductor component 100 and the first surface 250 of the cover plate 210, and the second cavity B is located at one side of the first cavity a, and the second cavity B is partially surrounded and partially sealed by the bonding layer 220 (or the bonding layer 220 surrounds the first cavity a and the second cavity B, respectively); the communication hole C is used for communicating the second cavity B with the external environment.

The bonding layer 220 bonds the semiconductor component 100 and the lid 210 together in a first packaging environment. The semiconductor component 100 and the cap plate 210 may be bonded using adhesive/anodic bonding, metal bonding, hybrid metal/polymer wafer bonding, and the like. The gas pressure and the gas composition of the completely sealed first cavity a are adjusted by adjusting the gas pressure and the gas composition of the first package environment, for example, the gas pressure in the first cavity a is determined by the gas pressure when the semiconductor component 100 and the lid 210 are bonded and other process parameters in the process.

In the particular embodiment shown in fig. 4, the diameter of the cap plate 210 is smaller than the diameter of the semiconductor component 100, and the edge of the cap plate 210 is located inside the edge of the semiconductor component 100, i.e., a step is formed at the edge of the bonded structure 300. The first recess 211 is engaged with the first surface 150 of the semiconductor component 100 in (or around) the area where the first MEMS device (i.e., MEMS1)130 is located to form a first cavity a, in which the first MEMS device (i.e., MEMS1)130 is received; the second recess 212 is engaged with the first surface 150 of the semiconductor component 100 in (or around) the area where the second MEMS device (i.e., MEMS2)131 is located to form a second cavity B, in which the second MEMS device (i.e., MEMS2)131 is received. The trench 140 formed on the first surface 150 of the semiconductor component 100 and located outside the second MEMS device (i.e., MEMS2)131 is opposite to the sidewall of the second groove 212 of the cover plate 210, and a communication hole C communicating the second cavity B with the outside is formed in a space surrounded by the trench 140 and the opposite sidewall of the second groove 212. That is, when the semiconductor component 100 and the cover plate 210 are bonded together by the bonding layer 220, the first MEMS device (i.e., the MEMS1)130 is sealed in the first cavity a, the second MEMS device (i.e., the MEMS2)131 is located in the second cavity B, and after bonding, the second cavity B is still communicated with the outside through the communication hole C. The communication hole C is used to adjust the gas pressure and gas composition of the second chamber B. The bonding layer 220 bonds a side surface of the first structure layer 120 away from the substrate 110 (i.e., the first surface 150 of the semiconductor component 100) and the first surface 250 of the cover plate 210 together; the sidewall of the second recess 212 opposite to the trench 140 is located above the trench 140, as described above with reference to the trench 140 shown in fig. 3 and 4.

In the embodiment shown in fig. 4, the sealing part 430 is used for sealing the communication hole C, so that the second cavity B is completely sealed. The sealing part 430 is formed by fusing the communication hole C in the second packaging environment. In the embodiment shown in fig. 4, the communicating hole C is locally heated by the pulsed laser 420, wherein the sidewall of the trench 140 and the sidewall of the second recess 212 forming the communicating hole C need to be thick enough to prevent the sidewall from being damaged when the pulsed laser 420 is heated. The pulsed laser 420 is angled with respect to the substrate 110 to melt the cover plate 210 material and the first structural layer 120 material near the via C, causing them to fuse together and prevent damage or heating elsewhere; and the pulse width of the pulsed laser 420 is sufficiently short and the power is sufficiently high. 430 is a schematic view of a sealing part formed by fusing upper and lower layer materials of the communicating hole C through local heating by laser pulses, and the sealing part 430 seals the communicating hole C, thereby realizing sealing of the second cavity B. The gas pressure and the gas composition of the completely sealed second cavity B are adjusted by adjusting the gas pressure and the gas composition of the second package environment, for example, the gas pressure of the completely sealed second cavity B may be determined by the gas pressure of the second package environment when the laser pulse is emitted. The air pressure of the completely sealed first cavity a is greater than the air pressure of the completely sealed second cavity B, and may also be less than the air pressure of the completely sealed second cavity B, which may be determined by adjusting the air pressure during bonding (i.e., the first sealing environment) and during melting the communication hole C (or the second sealing environment). In one embodiment, the MEMS device in the lower air pressure cavity A, B may be a gyroscope, filter, oscillator, etc., and the MEMS device in the higher air pressure cavity A, B may be an accelerometer, pressure sensor, infrared sensor, etc.

The hermetic package structure 600 with cavity device shown in fig. 6 includes a bonding structure 500 and a sealing part 430. The bonding structure 500 includes a semiconductor component 100-1, a cover plate 210, a bonding layer 220, a first cavity a, a second cavity B, and a communication hole C.

The structure of the cover plate 210 shown in fig. 6 is the same as that of the cover plate 210 shown in fig. 4, and for details, reference is made to the description of the cover plate 210 shown in fig. 4, and details are not repeated here.

The semiconductor component 100-1 shown in fig. 6 is substantially the same in structure as the semiconductor component 100 shown in fig. 4, with the main difference that the semiconductor component 100-1 shown in fig. 6 further includes a second structure layer 510; the trench 240 is formed in the second structural layer 510. Specifically, the semiconductor component 100-1 shown in fig. 6 includes: a substrate 110, a first structural layer 120, a second structural layer 510, a first microelectromechanical system device (i.e., MEMS1)130, a second microelectromechanical system device (i.e., MEMS2)131, and a trench 240. Wherein the first structural layer 120 is located above the substrate 110; the first micro-electro-mechanical system device (i.e., MEMS1)130 and the second micro-electro-mechanical system device (i.e., MEMS2)131 are located above and spaced along a surface of the first structural layer 120 on a side away from the substrate 110; the second structural layer 510 is located above the first structural layer 120 and surrounds the first MEMS device (i.e., MEMS1)130 and the second MEMS device (i.e., MEMS2), respectively; a surface of the second structure layer 510 away from the first structure layer 120 is a first surface (not shown) of the semiconductor component 100, and a surface of the substrate 110 away from the first structure layer 120 is a second surface (not shown) of the semiconductor component 100.

In the specific embodiment shown in fig. 6, the bonding layer 220 bonds a side surface of the second structural layer 510 remote from the first structural layer 120 (i.e., the first surface of the semiconductor component 100) and the first surface of the cap plate 210 together; the trench 240 is formed on a side surface of the second structural layer 510 away from the substrate 110 (i.e., the first surface of the semiconductor component 100) and outside (or around) the second MEMS device (i.e., the MEMS2) 131; the sidewall of the second recess 212 opposite to the trench 240 is located above the trench 240, as described above with reference to the trench 240 shown in fig. 5 and 6. As shown in fig. 6, a sealing part 430 is formed by melting the communication hole C in the second packaging environment, and the sealing part 430 is used to seal the communication hole C, thereby completely sealing the second cavity B. In the embodiment shown in fig. 6, the communicating hole C is locally heated by the pulsed laser 420, wherein the sidewall of the trench 140 and the sidewall of the second recess 212 forming the communicating hole C need to be thick enough to prevent the sidewall from being damaged when the pulsed laser 420 is heated. The pulsed laser 420 is angled with respect to the substrate 110 to melt the material of the cover plate 210 and the material of the second structural layer 510 near the via C, so that they are fused together and prevent damage or heating of other parts; and the pulse width of the pulsed laser 420 is sufficiently short and the power is sufficiently high.

The bonding structure shown in fig. 7 includes a semiconductor component 100-2, a cap plate 210, a bonding layer 220, a first cavity a, a second cavity B, and a communication hole C.

The structure of the cover plate 210 shown in fig. 7 is the same as that of the cover plate 210 shown in fig. 4, and for details, reference is made to the description of the cover plate 210 shown in fig. 4, and details are not repeated here.

The semiconductor component 100-2 shown in fig. 7 is substantially the same in structure as the semiconductor component 100 shown in fig. 4, with the main difference that the semiconductor component 100-2 shown in fig. 7 further includes a second structure layer 710; the trench 340 is formed in the second structural layer 710, and a sidewall of the second recess 212 opposite to the trench 340 is suspended within the trench 340. Specifically, the semiconductor component 100-2 shown in fig. 7 includes: a substrate 110, a first structural layer 120, a second structural layer 710, a first microelectromechanical system device (i.e., MEMS1)130, a second microelectromechanical system device (i.e., MEMS2)131, and a trench 340. Wherein the first structural layer 120 is located above the substrate 110; the first micro-electro-mechanical system device (i.e., MEMS1)130 and the second micro-electro-mechanical system device (i.e., MEMS2)131 are located above and spaced along a surface of the first structural layer 120 on a side away from the substrate 110; the second structural layer 710 is located above the first structural layer 120 and surrounds only a second MEMS device (i.e., MEMS 2); a side surface of the second structure layer 710 away from the first structure layer 120, and a portion of a side surface of the first structure layer 120 away from the substrate 110, which is not covered by the second structure layer 510, constitutes a first surface (not identified) of the semiconductor component 100-2, and a side surface of the substrate 110 away from the first structure layer 120 is a second surface (not identified) of the semiconductor component 100.

In the particular embodiment shown in fig. 7, bonding layer 220 bonds together a side surface of the second structural layer 710 remote from the first structural layer 120 (which is the first surface of semiconductor component 100-2); the trench 340 is formed on a side surface of the second structural layer 710 away from the substrate 110 (which belongs to the first surface of the semiconductor component 100-2) and is located outside (or around) the second MEMS device (i.e., MEMS2) 131; the sidewalls of the second recess 212 opposite to the trench 340 are suspended in the trench 340, specifically, refer to the trench 340 shown in fig. 7.

It should be noted that, in another embodiment, the sidewall portion of the second recess 212 opposite to the trench 340 in fig. 7 may be etched to make the sidewall of the second recess 212 opposite to the trench 340 shorter than other sidewall portions of the second recess 212, so that the short sidewall is opposite to the trench 340 and above the trench 340, as described in fig. 8 and the foregoing description of fig. 8.

As can be seen from the above embodiments, the

trenches

140, 240, 340, 840 may also be formed in the second

structural layer

510, 710, and the second

structural layer

In summary, the cover plate 210 for packaging of the present invention has a first recess 211 and a second recess 212, wherein, when the wafer is bonded, the first recess 211 forms a first cavity a and is completely sealed, the second recess 212 forms a second cavity B and is partially sealed, and the second cavity B is communicated with the external environment through a communication hole C; then, sealing the communication hole C to realize complete sealing of the second cavity B, wherein the sealing of the communication hole C can be realized by melting the communication hole; the first cavity A and the second cavity B can be different in gas pressure and gas type, and the gas pressure and the gas composition of the packaging environment can be adjusted to realize the purpose. Therefore, the utility model can integrate a plurality of different MEMS devices on a single chip, thereby improving the integration level, reducing the size of the chip, realizing the multifunctional measurement of the single chip, and the like. In addition, the process of the utility model is compatible with the existing semiconductor processing process, and can further reduce the cost of the MEMS system; the influence of the environment gas and the air pressure on the pulse laser is small, and when the second cavity B is sealed, the selection of the components of the gas in the cavity and the size of the air pressure is more diversified.

In the present invention, the terms "connected", "connecting", and the like mean electrical connections, and direct or indirect electrical connections unless otherwise specified.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.

Claims

1. The utility model provides a take airtight packaging structure of cavity device which characterized in that, it includes:

a semiconductor component;

a cover plate;

a bonding layer between the semiconductor component and the cover plate to bond the semiconductor component and the cover plate together;

a first cavity between the semiconductor component and the cover plate, surrounded by the bonding layer and completely sealed;

a second cavity between the semiconductor component and the cover plate, the second cavity being located on one side of the first cavity, the second cavity being surrounded by the bonding layer and partially sealed;

a communication hole communicating the second cavity without being completely sealed by the bonding layer;

and a sealing part formed by melting and used for sealing the communication hole so that the second cavity is completely sealed.

2. The hermetic package structure with cavity device according to claim 1,

the gas pressure within the fully sealed first cavity is different from the gas pressure within the fully sealed second cavity;

the composition of the gas within the first fully sealed cavity is different from the composition of the gas within the second fully sealed cavity; and/or

A first microelectromechanical system device within the first cavity is different from a second microelectromechanical system device within the second cavity.

3. The hermetic package structure with cavity device according to claim 1,

the cover plate further comprises a first groove and a second groove which are formed on the first surface of the cover plate, and the first groove and the second groove are arranged at intervals along the first surface of the cover plate;

the semiconductor component further includes first and second MEMS devices located at the first surface of the semiconductor component, the first and second MEMS devices spaced apart along the first surface of the semiconductor component;

the first groove is buckled with a first surface of the semiconductor component in the area where the first micro-electro-mechanical system device is located to form a first cavity, and the first micro-electro-mechanical system device is contained in the first cavity; the second groove is buckled with the first surface of the semiconductor component in the area where the second micro-electro-mechanical system device is located to form a second cavity, and the second micro-electro-mechanical system device is contained in the second cavity.

4. The hermetic package structure with cavity device according to claim 3,

the semiconductor component further comprising a trench formed in the first surface of the semiconductor component and located outside of the second MEMS device,

the groove formed on the first surface of the semiconductor component is opposite to the side wall of the second groove formed on the first surface of the cover plate, and the groove and the opposite side wall of the second groove enclose the communication hole which is communicated with the second cavity and the outside.

5. The hermetic package structure with cavity device according to claim 4,

the side wall of the second groove opposite to the groove is positioned above the groove, or the side wall of the second groove opposite to the groove is suspended in the groove;

the trench is formed in a first structural layer located below the first and second MEMS devices; or the trench is formed in a second structural layer that is the same layer as the first and second MEMS devices.

6. The hermetic package structure of the device with cavity according to claim 4, wherein the semiconductor component further comprises a substrate and a first structural layer over the substrate,

the first MEMS device and the second MEMS device are positioned above the surface of one side, far away from the substrate, of the first structural layer and are arranged along the surface at intervals;

the groove is formed on one side surface of the first structural layer far away from the substrate and is positioned at the outer side of the second micro-electro-mechanical system device,

or, the semiconductor component further comprises a substrate, a first structural layer and a second structural layer,

the first structural layer is located above the substrate;

the first micro-electromechanical system device and the second micro-electromechanical system device are positioned above one side surface of the first structural layer far away from the substrate and are arranged at intervals along the first surface;

the second structural layer is located above the first structural layer and surrounds the first and second MEMS devices, respectively, or the second structural layer only surrounds the second MEMS device;

the groove is formed on one side surface of the second structural layer far away from the first structural layer and is positioned outside the second micro-electro-mechanical system device.

7. The hermetic package structure with cavity device according to claim 6,

the first structure layer is a circuit layer or a dielectric layer;

the second structural layer is in a same layer as the first and second MEMS devices;

the micro electro mechanical system device is a gyroscope, an accelerometer, a pressure sensor, an inertial sensor or a biochemical sensor.

8. The hermetic package structure with cavity device according to any one of claims 1 to 7,

the bonding layer bonds the semiconductor component and the cover plate together in a first packaging environment;

the sealing part is formed by melting the material at the through hole in a pulse laser local heating mode under a second packaging environment;

adjusting the gas pressure and gas composition of the fully sealed first cavity by adjusting the gas pressure and gas composition of the first packaging environment; adjusting the gas pressure and gas composition of the second cavity, which is completely sealed, by adjusting the gas pressure and gas composition of the second package environment.