CN212461602U - Three-dimensional packaging structure of embedded substrate chip system - Google Patents

Abstract

The embodiment of the utility model provides a bury three-dimensional packaging structure of base plate chip system makes first interconnect structure and second interconnect structure electricity connect through-hole structure, makes the IO pin distribute at the front and the back of chip, has realized the three-dimensional perpendicular interconnection of the positive and negative two sides of chip, can improve pin density, realizes more functions, and satisfies the demand of little volume, low loss, low time delay. The volume of the packaging structure can be reduced, and the integration level is improved.

Description

Three-dimensional packaging structure of embedded substrate chip system

Technical Field

The utility model relates to a semiconductor package field especially relates to a bury three-dimensional packaging structure of base plate chip system.

Background

Electronic packaging has become an important direction for the development of the semiconductor industry, and in the process of packaging technology development for over twenty years, the requirements of high-density, small-size and low-cost packaging have become the mainstream direction of packaging.

However, the existing package structure is yet to be perfected.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a three-dimensional package structure of embedded substrate chip system to optimize the package structure and improve the reliability of the package structure.

The embodiment of the utility model provides a bury integrated three-dimensional packaging structure of base plate chip system, packaging structure includes:

a substrate comprising a first side and a second side arranged oppositely;

a plurality of via structures including a conductive layer that penetrates the substrate and a dielectric layer between the conductive layer and the substrate;

a first interconnect structure formed on the first face and electrically connected to the conductive layer;

a first groove formed on the second face;

the chip is arranged in the first groove;

a passivation layer covering the chip and the second face; and

and the second interconnection structure is formed in the passivation layer and is electrically connected with the through hole structure and the chip respectively.

Preferably, the chip comprises a first chip and a second chip;

the first chip and the second chip are adhered to the bottom of the first groove; the first chip and the second chip are spaced apart by a predetermined distance.

Preferably, the package structure further includes:

a second groove formed on the second face; and

and the third chip is adhered to the bottom of the second groove.

Preferably, the first chip, the second chip and the third chip are at least one of an analog integrated circuit chip, a digital/analog hybrid integrated circuit chip or a micro electro mechanical system chip, respectively.

Preferably, the second groove is disposed at one side of the first groove, and a part of the through hole structure is located between the first groove and the second groove.

Preferably, the material of the substrate is at least one of silicon, glass, printed circuit board, ceramic, diamond, or metal.

Preferably, the material of the conductive layer is at least one of titanium, tantalum, chromium, tungsten, copper, aluminum, nickel, gold or conductive adhesive.

Preferably, the material of the dielectric layer is at least one of silicon dioxide, silicon nitride, silicon oxynitride or silicon oxycarbide.

Preferably, the shape of the first groove and the second groove is any polygon, circle or ellipse.

Preferably, the via structure is located in a hole of the substrate;

the holes are vertical holes, stepped holes or flared holes.

The embodiment of the utility model provides a bury three-dimensional packaging structure of base plate chip system makes first interconnect structure and second interconnect structure electricity connect through-hole structure, makes the IO pin distribute at the front and the back of chip, has realized the three-dimensional perpendicular interconnection of the positive and negative two sides of chip, can improve pin density, realizes more functions, and satisfies the demand of little volume, low loss, low time delay. The volume of the packaging structure can be reduced, and the integration level is improved.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a flow chart of a three-dimensional packaging method of a substrate-embedded chip system according to a first embodiment of the present invention;

fig. 2-11 are schematic cross-sectional views of structures formed at various steps of a packaging method according to an embodiment of the invention;

fig. 12 is a schematic diagram of a three-dimensional package structure of a substrate-embedded chip system according to a second embodiment of the present invention.

Description of reference numerals:

a, a first chip; b, a second chip; c, a third chip; 10 a substrate; 11 a first side; 12 a second face; 20 a via structure; 21 a dielectric layer; 22 a conductive layer; 30 a first interconnect structure; 31 a first metal interconnection line; 32 a first pin; 40 a carrier sheet; 50 a first groove; 60 a second groove; 70 a first adhesive layer; 80 a second adhesive layer; 90 a passivation layer; 100 a second interconnect structure; 101 a second metal interconnection line; 102 a second pin; a' a first chip; b' a second chip; c' a third chip; 10' a substrate; 11' a first face; 12' a second face; a 20' via structure; 21' a dielectric layer; 22' a conductive layer; 30' a first interconnect structure; 31' a first metal interconnection line; 32' a first pin; 40' carrying plate; 50' a first groove; 60' a second groove; 70' a first adhesive layer; 80' a second adhesive layer; 90' a passivation layer; 100' a second interconnect structure; 101' a second metal interconnect line; 102' second pin.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of embodiments of the invention, certain specific details are set forth. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the embodiments of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the embodiments of the present invention, "a plurality" means two or more unless otherwise specified.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

When an element or layer is referred to as being "on," "engaged to," "connected to" or "coupled to" another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on," "directly engaged to," "directly connected to" or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a similar manner. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Spatially relative terms, such as "inner," "outer," "below," "lower," "above," "upper," and the like, are used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device may be otherwise oriented and the spatially relative descriptors used herein interpreted accordingly.

The three-dimensional embedded (fan-out) packaging is realized by the three-dimensional fan-out packaging of a chip on a substrate (the substrate can be a wafer level or a board level), is an advanced packaging process with a large I/O number and good integration flexibility, and can realize multi-chip integration in the vertical direction and the horizontal direction in one packaging body. The existing three-dimensional integration technology adopts molding compound as a fan-out carrier plate, and has great difference with the traditional silicon wafer. The processes of photoetching, developing, exposing, manufacturing fine metal circuits, ball planting and the like are mature on the silicon chip. However, the molding compound is not suitable for the above processing process, for example, the molding compound is not resistant to high temperature, is easy to age and warp, has difficulties in holding the molding compound wafer and preparing fine circuits, and needs related customized equipment. From the structure, the thermal expansion coefficient difference between the molding compound and silicon is large, which brings reliability problem, and the heat dissipation of the molding compound is also a problem for the chip with large power consumption.

In order to solve the defect of molding compound encapsulation, the utility model discloses bury base plate chip system three-dimensional packaging structure adopts good heat dissipation and non-deformable's material to encapsulate the chip to improve packaging structure's reliability.

Fig. 1 is a flowchart of a three-dimensional packaging method for a substrate-embedded chip system according to a first embodiment of the present invention. As shown in fig. 1, the packaging method according to the first embodiment of the present invention includes the following steps:

step S100, providing a substrate 10, where the substrate 10 includes a first surface 11 and a second surface 12 disposed opposite to each other.

Step S200, forming a plurality of via structures 20 on the first surface 11, where the via structures 20 include a dielectric layer 21 formed on the bottom and the sidewall of the hole and a conductive layer 22 filled on the dielectric layer 21.

Step S300, forming a first interconnection structure 30 electrically connected to the via structure 20 on the first surface 11.

Step S400, bonding a carrier sheet 40 on the first surface 11 to protect the first surface 11.

Step S500, a planarization process is used to thin the second surface 12 to expose the conductive layer 22.

Step S600, forming a first groove 50 on the second surface 12.

Step S700, at least one chip is placed in the first recess 50.

Step S800, forming a passivation layer 90 on the second surface 12 to cover the chip and the second surface 12.

Step S900, forming a second interconnection structure 100 on the passivation layer 90, wherein the second interconnection structure is electrically connected to the via structure 20 and the chip, respectively.

And S1000, removing the bearing sheet 40.

In an optional implementation manner, the encapsulation method according to the first embodiment of the present invention further includes the following steps:

step S600a, forming a second groove 60 on the second face 12.

Step S700a, placing at least one chip in the second recess 60.

Fig. 2-11 are schematic cross-sectional views of structures formed at various steps of a packaging method according to an embodiment of the present invention. Fig. 2 is a schematic cross-sectional view of the substrate 10. Referring to fig. 2, in step S100, a substrate 10 is provided. The substrate 10 includes a first side 11 and a second side 12 disposed opposite to each other.

The material of the substrate 10 is at least one of silicon, glass, printed circuit board, ceramic, diamond, and metal.

Optionally, the material of the substrate 10 has better thermal stability and better heat dissipation. In the present embodiment, a silicon wafer may be employed as the material of the substrate 10. Since silicon is inexpensive and easy to process, the use of silicon wafers as the material of the substrate 10 can reduce the processing cost.

In other alternative implementations, the material of the substrate 10 may also be silicon carbide, gallium arsenide, gallium phosphide, indium arsenide, or indium dysprosium.

Referring to fig. 3, in step S200, a plurality of via structures 20 are formed on the first surface 11, where the via structures 20 include a dielectric layer 21 formed at the bottom and the sidewalls of a hole and a conductive layer 22 filled on the dielectric layer 21.

Specifically, forming a plurality of via structures 20 on the first face 11 includes the steps of:

step S201, etching the first surface 11 to form a plurality of holes.

Step S202, forming a dielectric layer 21 covering the bottom and the side wall of the hole in the plurality of holes.

Step S203, filling a conductive material on the dielectric layer 21 to form a conductive layer 22.

In step S201, the first surface 11 is etched to form a plurality of holes. Specifically, dry etching or wet etching is used to etch the predetermined position of the first surface 11 to form a plurality of holes. In this embodiment, the plurality of holes are formed by a dry etching process, which may be a reactive ion etching method. The bottom of the hole is at a distance from the second side 12.

In step S202, a dielectric layer 21 is formed in the plurality of holes covering the bottom and sidewalls of the holes. Specifically, the dielectric layer 21 may be formed on the bottom and the sidewall of the hole using a Chemical Vapor Deposition (CVD) process. The Chemical Vapor Deposition method may include Low Temperature Chemical Vapor Deposition (LTCVD), Low Pressure Chemical Vapor Deposition (LPCVD), Rapid Thermal Chemical Vapor Deposition (RTCVD), Plasma Enhanced Chemical Vapor Deposition (PECVD), and the like. The material of the dielectric layer 21 may be at least one of silicon dioxide, silicon nitride, silicon oxynitride or silicon oxycarbide.

The dielectric layer 21 serves as an electrical isolation to prevent electrical shorting of the conductive layer 22 to the substrate 10 or other structure. The reliability of the packaging structure is ensured. In this embodiment, the dielectric layer 21 may be formed by a high temperature deposition process or a thermal oxidation process. This improves the density of the dielectric layer 21 and improves the insulation of the dielectric layer 21.

In step S203, a conductive material is filled on the dielectric layer 21 to form a conductive layer 22.

The conductive material is at least one of titanium, tantalum, chromium, tungsten, copper, aluminum, nickel, gold or conductive adhesive.

In an alternative implementation, the conductive material is copper, and the conductive layer 22 may be formed on the dielectric layer 21 by an electroplating process.

In another optional implementation manner, the conductive material is a conductive adhesive, the dielectric layer 21 is filled with the conductive adhesive, and the conductive layer 22 is formed after drying.

It should be understood that the drawings of the embodiments of the present invention show, by way of example, only three via structures 20 of one cross-section in the substrate 10, and that in fact other via structures 20 may be formed in the substrate 10. The arrangement of the via structures 20 is not limited to the periphery of the subsequently placed chip, and can be located on the substrate 10 at any position.

Referring to fig. 4, in step S300, a first interconnection structure 30 electrically connected to the via structure 20 is formed on the first face 11.

In the present embodiment, the first interconnection structure 30 includes a first metal interconnection line 31 and a first pin 32. Alternatively, the first leads 32 may be metal bumps, solder balls, or conductive adhesive.

The first metal interconnection line 31 is electrically connected with the conductive layer 22, and the first pin 32 is used for rerouting the position of I/O.

Specifically, the first metal interconnection lines 31 may be formed by forming an insulating layer on the first face 11, etching the insulating layer to form trenches, and forming the first metal interconnection lines 31 in the trenches.

In the present embodiment, the first surface 11 is located on the back surface of the chip, and the via structure 20 and the first interconnect structure 30 electrically connected to the via structure 20 are formed on the first surface 11 located on the back surface of the chip. The adhesive layer can be prevented from losing efficacy due to the high temperature of a high-temperature deposition process or a thermal oxidation process after the chip is pasted.

Referring to fig. 5, in step S400, a carrier sheet 40 is bonded to the first surface 11 to protect the first surface 11.

Specifically, the carrier sheet 40 is adhered to the first face 11 by bonding glue. The carrier sheet 40 is a silicon wafer, glass, metal or printed circuit board.

In this embodiment, the bonding paste can buffer the pressure generated during the bonding process and protect the surface structure. The carrier sheet 40 protects the structure formed on the first surface 11, and supports the substrate 10 to assist subsequent processing. Subsequent processing thins the substrate 10 from the second side 12, so that the thickness of the substrate 10 is generally 200 μm, which cannot be directly handled and processed, and the processing is performed with the aid of the carrier sheet 40. Meanwhile, the carrier sheet 40 may correct the substrate 10 to prevent the substrate 10 from being deformed due to the internal stress, and prevent the vacuum chuck for fixing the substrate 10 from being unable to adsorb the substrate 10 due to the deformation of the substrate 10.

In this embodiment, the carrier sheet is used for assisting in processing, so that the requirement for thinning the packaging structure can be met, and the size of the packaging structure can be reduced.

Referring to fig. 6, in step S500, the second side 12 is thinned by a planarization process to expose the conductive layer 22.

Specifically, the second side 12 of the substrate 10 may be ground or polished by a Grinding process or Chemical Mechanical Polishing (CMP) to reduce the thickness of the substrate 10 to expose the conductive layer 22.

Further, the thickness of the substrate 10 is thinned to a thickness of 100-300 microns of the substrate 10. In the present embodiment, the thickness of the thinned substrate 10 is 200 μm.

Referring to fig. 7, in step S600, a first groove 50 is formed on the second face 12.

Referring to fig. 7, in step S600a, a second groove 60 is formed on the second face 12.

Specifically, step S600a and step S600 are performed simultaneously. In the present embodiment, an etching process is used to form the first recess 50 and the second recess 60 on the second face 12.

Referring to fig. 8, at least one chip is placed in the first recess 50 in step S700.

Specifically, a first chip a and a second chip B are attached to the bottom of the first groove 50. The first chip A and the second chip B are spaced apart by a predetermined distance.

In the present embodiment, the first chip a and the second chip B are fixed by an adhesive glue, which fills the gap between the first groove 50 and the chip, and finally forms the first adhesive layer 70 between the chip and the first groove 50.

Referring to fig. 8, in step S700a, at least one chip is placed in the second recess 60.

The second recess 60 is disposed at one side of the first recess 50, and a portion of the via structure 20 is located between the first recess 50 and the second recess 60.

Specifically, step S700a and step S700 are executed simultaneously. The third chip C is attached to the bottom of the second groove 60. In this embodiment, the third chip C is fixed by an adhesive glue, which fills the gap between the first groove 50 and the chip, and finally forms the second adhesive layer 80 between the chip and the first groove 50.

In other alternative implementations, the first adhesive layer 70 and the second adhesive layer 80 may be replaced with Die Attach Film (DAF)

In terms of chip functions, the first chip a, the second chip B, and the third chip C are at least one of an analog integrated circuit chip, a digital/analog hybrid integrated circuit chip, or a Micro Electro Mechanical System (MEMS) chip, respectively. From the material of the chip, the first chip a, the second chip B and the third chip C may be Low k or non-Low k chips, respectively.

In the present embodiment, the first groove 50 and the second groove 60 are formed as an example, and in fact, other grooves may be formed on the substrate 10 according to the requirement of the package. That is, the number of grooves may be plural. Meanwhile, the number of the single groove embedded chips is not limited to one or two, and may be more than one. The types of chips may be the same or different. Therefore, integration level of the packaging structure can be improved by integrating different types or different materials.

Referring to fig. 9, in step S800, a passivation layer 90 is formed on the second side 12 to cover the chip and the second side 12.

The passivation layer 90 may be at least one of silicon dioxide, silicon nitride, silicon oxynitride, or silicon oxycarbide. The passivation layer 90 may be formed using a chemical vapor deposition process. The passivation layer 90 can protect the chip on the one hand, plays waterproof dirt-proof effect, and on the other hand can play insulating effect, avoids the chip short circuit.

In this embodiment, the passivation layer 90 is used to encapsulate the chip in the first groove 50 and the second groove 60.

Referring to fig. 10, in step S900, a second interconnect structure 100 electrically connected to the via structure 20 and the chip, respectively, is formed on the passivation layer 90.

In this embodiment, the second interconnect structure 100 includes a second metal interconnect line 101 and a second pin 102. Alternatively, the second lead 102 may be a metal bump, a solder ball, or a conductive adhesive.

Specifically, the second metal interconnection line 101 may be formed by etching the passivation layer 90, forming a trench in the passivation layer 90, and forming the second metal interconnection line 101 in the trench.

In an alternative implementation manner, the material of the second metal interconnection line 101 is copper, and specifically, the second metal interconnection line 101 may be formed in the trench by using an electroplating process.

The second metal interconnection line 101 is electrically connected to the conductive layer 22 and the chip, respectively, and the second metal bump is used to rewire the position of the I/O pin. Therefore, the first interconnection structure 30 and the second interconnection structure 100 are electrically connected through the through hole structure 20, and the I/O pins are distributed on the front surface and the back surface of the chip, so that the volume of the packaging structure can be reduced, and the integration level can be improved.

Referring to fig. 11, in step S1000, the carrier sheet 40 is removed.

In the first embodiment of the present invention, the through-hole structure 20 is formed on the first surface 11 of the substrate 10, the first groove 50 is formed on the second surface 12 of the substrate 10, and the chip is fixed in the first groove 50, so that the through-hole structure 20 and the first groove 50 are respectively processed on two surfaces of the substrate 10, and the mutual influence during the processing process is avoided. Meanwhile, the through-hole structure 20 is formed first, so that the chip fixed in the first groove 50 is prevented from falling off or moving due to high temperature during the through-hole forming process. Therefore, the utility model discloses packaging method can improve packaging structure's reliability.

It should be understood that, in the drawings of the embodiment of the present invention, the side walls of the through hole structure 20, the first groove 50, and the second groove 60 are illustrated by taking a vertical surface as an example, but actually, the through hole structure 20, the first groove 50, and the second groove 60 are formed by etching, and therefore, the side walls of the through hole structure 20, the first groove 50, and the second groove 60 may be inclined surfaces, irregular shapes, or the like.

Fig. 12 is a schematic diagram of a three-dimensional package structure of a substrate-embedded chip system according to a second embodiment of the present invention. As shown in fig. 12, the package structure according to the second embodiment of the present invention includes: a substrate 10 ', a plurality of via structures 20', a first interconnect structure 30 ', a first recess 50', a chip, a passivation layer 90 'and a second interconnect structure 100'.

The substrate 10 ' includes a first side 11 ' and a second side 12 ' disposed opposite to each other.

The material of the substrate 10' is at least one of silicon, glass, printed circuit board, ceramic, diamond, and metal.

Optionally, the material of the substrate 10' has better thermal stability and better heat dissipation. In the present embodiment, a silicon wafer may be used as the material of the substrate 10'. Because the price of silicon is lower, the processing cost can be reduced. Meanwhile, silicon is easy to process, thin lines can be manufactured, high-density wiring can be achieved, and the requirement of high-density O/I can be met. Moreover, the thermal expansion coefficients of silicon and the chip are similar, so that the packaging structure has excellent reliability.

In other alternative implementations, the material of the substrate 10' may also be silicon carbide, gallium arsenide, gallium phosphide, indium arsenide, or indium dysprosium, or the like.

The plurality of via structures 20 'includes a conductive layer 22' extending through the substrate 10 'and a dielectric layer 21' located between the conductive layer 22 'and the substrate 10'.

The via structures 20 'are located in holes of the substrate 10'. The hole is at least one of a vertical hole, a stepped hole or a horn-shaped hole.

The dielectric layer 21 ' serves as an electrical isolation to prevent electrical shorting of the conductive layer 22 ' to the substrate 10 ' or other structure. The reliability of the packaging structure is ensured. In this embodiment, the material of the dielectric layer 21' may be at least one of silicon dioxide, silicon nitride, silicon oxynitride, or silicon oxycarbide.

The material of the conductive layer 22' may be at least one of titanium, tantalum, chromium, tungsten, copper, aluminum, nickel, gold, or conductive paste. In this embodiment, the material of the conductive layer 22' is copper.

A first interconnect structure 30 ' is formed on the first side 11 ' and is electrically connected to the conductive layer 22 '.

In this embodiment, the first interconnection structure 30 ' includes a first metal interconnection line 31 ' and a first pin 32 '. Alternatively, the first leads 32' may be metal bumps, solder balls, or conductive adhesive.

The first metal interconnection line 31 ' is electrically connected with the conductive layer 22 ', and the first pin 32 ' is used for rerouting the position of I/O.

A first groove 50 'is formed on the second face 12'.

The chip is disposed in the first recess 50'.

In an alternative implementation, the chips include a first chip a 'and a second chip B'.

The first chip a ' and the second chip B ' are attached to the bottom of the first groove 50 '. The first chip a 'and the second chip B' are spaced apart by a predetermined distance. Specifically, the first chip a 'and the second chip B' are adhered to the bottom of the first groove 50 'by the first adhesive layer 70'.

In an alternative implementation, the package structure further includes a second groove 60 ', the second groove 60 ' being formed on the second face 12 '. Specifically, the second groove 60 ' is disposed at one side of the first groove 50 ', and a portion of the via structure 20 ' is located between the first groove 50 ' and the second groove 60 '.

The shapes of the first groove 50 'and the second groove 60' are arbitrary polygons, circles, or ellipses, respectively.

And a third chip C 'is adhered to the bottom of the second groove 60'. Specifically, the third chip C ' is adhered to the bottom of the first groove 50 ' by the second adhesive layer 80 '.

The first chip A ', the second chip B ' and the third chip C ' are at least one of an analog integrated circuit chip, a digital/analog hybrid integrated circuit chip or a micro electro mechanical system chip respectively.

In terms of chip functions, the first chip a ', the second chip B ' and the third chip C ' are at least one of an analog integrated circuit chip, a digital/analog hybrid integrated circuit chip or a MEMS chip, respectively. From the material of the chip, the first chip a ', the second chip B ' and the third chip C ' may be Low k or non-Low k chips, respectively.

In the present embodiment, the package structure including the first recess 50 ' and the second recess 60 ' is taken as an example for illustration, and in fact, other recesses may be formed on the substrate 10 ' according to the requirement of the package. That is, the number of grooves may be plural. Meanwhile, the number of the single groove embedded chips is not limited to one or two, and may be more than one. The types of chips may be the same or different. Therefore, integration level of the packaging structure can be improved by integrating different types or different materials.

A passivation layer 90 'covers the chip and the second side 12'.

The passivation layer 90' may be at least one of silicon dioxide, silicon nitride, silicon oxynitride, or silicon oxycarbide. The passivation layer 90' can protect the chip on one hand, play waterproof dirt-proof effect, and on the other hand can play insulating effect, avoids the chip short circuit.

A second interconnect structure 100 ' is formed in the passivation layer 90 ' and is electrically connected to the via structure 20 ' and the chip, respectively.

The second interconnect structure 100 ' includes a second metal interconnect line 101 ' and a second pin 102 '. Alternatively, the second lead 102' may be a metal bump, a solder ball or a conductive adhesive. The second metal interconnection line 101 ' may be formed in the passivation layer 90 ', and the second pin 102 ' electrically connected to the second metal interconnection line 101 ' may be partially formed on the passivation layer 90 '.

The utility model discloses in the second embodiment, make first interconnect structure 30 ' and second interconnect structure 100 ' electricity be connected through-hole structure 20 ', make the IO pin distribute at the front and the back of chip, realized the three-dimensional perpendicular interconnection of chip tow sides, can improve pin density, realize more functions, and satisfy little volume, low loss, the demand of low time delay. The volume of the packaging structure can be reduced, and the integration level is improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. A three-dimensional packaging structure of a buried substrate chip system, the packaging structure comprising:

a substrate (10 ') comprising a first face (11 ') and a second face (12 ') arranged opposite;

a plurality of via structures (20 '), said via structures (20 ') comprising a conductive layer (22 ') extending through said substrate (10 ') and a dielectric layer (21 ') located between said conductive layer (22 ') and substrate (10 ');

a first interconnect structure (30 ') formed on said first face (11 ') and electrically connected to said conductive layer (22 ');

a first groove (50 ') formed on the second face (12');

a chip arranged in the first recess (50');

a passivation layer (90 ') covering the chip and the second face (12'); and

a second interconnect structure (100 ') formed in the passivation layer (90 ') and electrically connected to the via structure (20 ') and the chip, respectively.

2. The package structure according to claim 1, wherein the chips comprise a first chip (a ') and a second chip (B');

the first chip (A ') and the second chip (B ') are pasted at the bottom of the first groove (50 '); the first chip (A ') and the second chip (B') are spaced apart by a predetermined distance.

3. The package structure of claim 2, further comprising:

a second groove (60 ') formed on the second face (12'); and

and a third chip (C ') adhered to the bottom of the second groove (60').

4. The package structure of claim 3, wherein the first chip (A '), the second chip (B ') and the third chip (C ') are at least one of an analog integrated circuit chip, a digital/analog hybrid integrated circuit chip or a micro-electro-mechanical system chip, respectively.

5. The encapsulation structure according to claim 3, wherein the second recess (60 ') is disposed on one side of the first recess (50 '), and a portion of the via structure (20 ') is located between the first recess (50 ') and the second recess (60 ').

6. The encapsulation structure according to claim 1, wherein the material of the substrate (10') is at least one of silicon, glass, printed circuit board, ceramic, diamond, or metal.

7. The package structure of claim 1, wherein the material of the conductive layer (22') is at least one of titanium, tantalum, chromium, tungsten, copper, aluminum, nickel, gold, or conductive paste.

8. The encapsulation structure according to claim 1, wherein the dielectric layer (21') is made of at least one of silicon dioxide, silicon nitride, silicon oxynitride, or silicon oxycarbide.

9. The encapsulation structure according to claim 3, characterized in that the shape of the first recess (50 ') and the second recess (60') is any polygon, circle or ellipse, respectively.

10. The encapsulation structure according to claim 1, characterized in that the via structure (20 ') is located in a hole of the substrate (10');

the holes are vertical holes, stepped holes or flared holes.

Images