SEMICONDUCTOR STRUCTURE AND MANUFACTURING METHOD THEREOF

Abstract

A semiconductor structure includes a substrate, a chip, a plurality of conductive bumps, a flexible printed circuit (FPC) board and a plurality of circuit patterns. The chip is disposed on the substrate and includes a plurality of pads. The conductive bumps are disposed on the pads respectively. The FPC board is connected between the substrate and the chip, and the conductive bumps penetrate through an end of the FPC board. The circuit patterns are disposed on the FPC board and electrically connected to the conductive bumps and the substrate.

Claims

1. A semiconductor structure, comprising: a substrate; a first chip disposed on the substrate and comprising a plurality of first pads; a plurality of first conductive bumps disposed on the first pads respectively; a first flexible printed circuit (FPC) board connecting between the substrate and the first chip, wherein the first conductive bumps penetrate through a first end of the first FPC board; and a plurality of first circuit patterns disposed on the first FPC board and electrically connecting the first conductive bumps and the substrate.

2. The semiconductor structure as claimed in claim 1, wherein each of the first conductive bumps is substantially a taper-shaped conductive bump, and tips of the taper-shaped conductive bumps penetrate through the first circuit patterns on the first FPC board.

3. The semiconductor structure as claimed in claim 1, wherein a material of each of the first conductive bumps comprises silver alloy or aluminum alloy.

4. The semiconductor structure as claimed in claim 1, further comprising a plurality of substrate conductive bumps disposed on the substrate, wherein the first circuit patterns are extended from the first FPC board onto the substrate and connected to the substrate conductive bumps respectively, so as to electrically connect the first conductive bumps and the substrate.

5. The semiconductor structure as claimed in claim 1, further comprising a plurality of substrate conductive bumps penetrating through a second end of the first FPC board and electrically connecting the first circuit patterns, wherein the second end is opposite to the first end.

6. The semiconductor structure as claimed in claim 1, further comprising a lamination adhesive disposed between the first FPC board and the first chip and between the first FPC board and the substrate.

7. The semiconductor structure as claimed in claim 1, further comprising a second chip, a plurality of second conductive bumps and a second FPC board, wherein the second chip is stacked on the first chip without covering the plurality of first conductive bumps, the second conductive bumps are disposed on a plurality of second pads of the second chip respectively, the second FPC board is connected between the first chip and the second chip and comprises a plurality of second circuit patterns, the first conductive bumps and the second conductive bumps penetrate through two opposite ends of the second FPC board respectively, so as to electrically connect the first conductive bumps and the second conductive bumps through the second circuit patterns.

8. The semiconductor structure as claimed in claim 1, wherein the plurality of first conductive bumps are formed by a three-dimensional (3-D) printing technique.

9. The semiconductor structure as claimed in claim 4, wherein the plurality of substrate conductive bumps and the first circuit patterns are formed by a three-dimensional (3-D) printing technique.

10. The semiconductor structure as claimed in claim 7, wherein the plurality of second conductive bumps are formed by a three-dimensional (3-D) printing technique.

11. The semiconductor structure as claimed in claim 7, wherein the plurality of second circuit patterns are formed by a three-dimensional (3-D) printing technique.

12. A manufacturing method of a semiconductor structure, comprising: providing a substrate; disposing a first chip on the substrate, wherein the first chip comprises a plurality of first pads; forming a plurality of first conductive bumps on the first pads by a three-dimensional (3-D) printing technique; and performing a thermal lamination process to connect the substrate and the first chip by a first FPC board, wherein the first conductive bumps penetrate through the first FPC board to be electrically connected to the substrate through the first FPC board.

13. The manufacturing method of the semiconductor structure as claimed in claim 12, further comprising: forming a plurality of first circuit patterns and a plurality of substrate conductive bumps by the three-dimensional (3-D) printing technique, wherein the first circuit patterns are extended from the first FPC board onto the substrate, so as to electrically connect the first conductive bumps and the substrate conductive bumps on the substrate.

14. The manufacturing method of the semiconductor structure as claimed in claim 12, further comprising: forming a plurality of substrate conductive bumps on the substrate by the 3-D printing technique, wherein when the first FPC board is connected between the substrate and the first chip, the substrate conductive bumps penetrate through the first FPC board and electrically connect a plurality of first circuit patterns on the first FPC board.

15. The manufacturing method of the semiconductor structure as claimed in claim 12, further comprising: stacking a second chip on the first chip without covering the plurality of first conductive bumps; forming a plurality of second conductive bumps on a plurality of second pads of the second chip respectively by the 3-D printing technique; and connecting the first chip and the second chip by a second FPC board, wherein the second FPC board comprises a plurality of second circuit patterns formed by the 3-D printing technique, the first conductive bumps and the second conductive bumps penetrate through two opposite ends of the second FPC board respectively, so as to electrically connect the first conductive bumps and the second conductive bumps through the second circuit patterns.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure.

[0011] FIG. 1 to FIG. 7 illustrates a manufacturing process of a semiconductor structure according to an embodiment of the present disclosure.

DESCRIPTION OF THE EMBODIMENTS

[0012] The present disclosure will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. The terms used herein such as above, below, front, back, left and right are for the purpose of describing directions in the figures only and are not intended to be limiting of the disclosure. Moreover, in the following embodiments, the same or similar devices are denoted by the same or similar referential numbers.

[0013] FIG. 1 to FIG. 7 illustrates a manufacturing process of a semiconductor structure according to an embodiment of the present disclosure. In the present embodiment, the manufacturing method of the semiconductor structure 100 includes the following steps. First, a substrate as shown in FIG. 1 is provided. Next, a first chip 120 is disposed on the substrate 110. In the present embodiment, the first chip 120 may be obtained by dicing a wafer having a plurality of chips. The first chip 120 includes a plurality of first pads 122, an active surface and a back surface opposite to the active surface. The first pads 122 is disposed on the active surface, and the first chip 120 is disposed on the substrate 110 via the back surface of the first chip 120.

[0014] Next, referring to FIG. 2, a plurality of first conductive bumps 130 are formed on the first pads 122 by a three-dimensional (3-D) printing technique. In detail, the present embodiment may print out the first conductive bumps 130 as shown in FIG. 2 according to a digital 3-D model of the first conductive bump 130 by a 3-D printing device. The 3-D printing technique of the present embodiment may include fused filament fabrication (FFF), stereo-lithography, melted and extrusion modelling, electron beam modelling, or other suitable 3-D printing techniques. The disclosure is not limited thereto.

[0015] In the present embodiment, each of the first conductive bumps 130 may substantially be a taper-shaped conductive bump as shown in the partially enlarged view of FIG. 2. Each of the first conductive bumps 130 includes a tip, and a material of each of the first conductive bumps 130 includes silver alloy or aluminum alloy. In the present embodiment, the digital 3-D model of the first conductive bump 130 may be a digital 3-D image file, which may be built by computer-aided design (CAD) or animation and modelling software, etc. The digital 3-D model is sliced into a plurality of cross-sections for the 3-D printing device to read and print the building material by layers on the print bed of the 3-D printing device according to the cross-sections of the digital 3-D model to form a plurality of stacking layers. The stacking layers stacked on top of each other to form the first conductive bump 130. That is to say, the first conductive bump 130 formed by 3-D printing technique may include a plurality of stacking layers stacked on top of each other. Certainly, the disclosure is not limited thereto. In addition, after the first conductive bumps is printed, a curing process may be optionally performed to cure the first conductive bumps 130 and enhance the stiffness of the first conductive bumps 130.

[0016] Next, referring to FIG. 3, a thermal lamination is performed to connect the substrate 110 and the first chip 120 by a first FPC board 140, wherein the tips of the tapered-shaped first conductive bumps 130 penetrate through a first end 142 of the first FPC board 140 to be electrically connected to the substrate 110 through the first FPC board 140. In detail, in the present embodiment, a lamination adhesive may be disposed on two opposite ends of the first FPC board 140, and then the thermal lamination is performed to laminate the two opposite ends of the first FPC board 140 on the first chip 120 and the substrate 110 respectively. In detail, the lamination adhesive may be disposed between the first FPC board 140 and the first chip 120 and between the first FPC board 140 and the substrate 110.

[0017] Referring to FIG. 4, in the present embodiment, a plurality of first circuit patterns 150 and a plurality of substrate conductive bumps 112 are formed by the 3-D printing technique, wherein the substrate conductive bumps 112 are printed on the substrate 110, and the first circuit patterns 150 is printed on the first FPC board 140 and the substrate 110 and contacts with the first conductive bumps 130 and the substrate conductive bumps 112 to electrically connect the first conductive bumps 130 and the substrate 110.

[0018] In addition, in another embodiment, the method of electrically connecting the first conductive bumps 130 and the substrate 110 through the first FPC board 140 may also be shown in FIG. 5. A plurality of first circuit patterns 150 may be pre-printed on the first FPC board 140 by the 3-D printing technique, and a plurality of substrate conductive bumps 112 are formed on the substrate 110 by the 3-D printing technique, such that, when the thermal lamination is performed on the first FPC board 140, the taper-shaped substrate conductive bumps 112 penetrate through a second end 144, which is opposite to the first end 142, of the first FPC board 140 and electrically connect the first circuit patterns 150 on the first FPC board 140. In the present embodiment, the substrate conductive bumps 112 may be in a taper shape as the first conductive bumps 130 is. Accordingly, the tip of the taper-shaped first conductive bump 130 penetrates through an end of the first circuit pattern 150, and the tip of the taper-shaped substrate conductive bump 112 penetrates through another end of the first circuit pattern 150, such that the first conductive bumps 130 are electrically connected to the substrate conductive bump 112 through the first circuit patterns 150 of the first FPC board 140. Accordingly, the manufacturing process of the semiconductor structure in the present embodiment may be substantially done.

[0019] In the present embodiment, the manufacturing method of the semiconductor structure may further continue to perform the following steps. Referring to FIG. 6, a second chip 160 is stacked on the first chip 120 without covering the first conductive bumps 130. The second chip 160 may include a plurality of second pads 162, an active surface and a back surface opposite to the active surface. The second pads 162 are disposed on the active surface of the second chip 160, and the second chip 160 is disposed on the first chip 120 via the back surface of the second chip 160. Next, a plurality of second conductive bumps 170 are formed on the second pads 162 of the second chip 160 respectively by the 3-D printing technique. The second conductive bump 170 may also be in a taper shape as the first conductive bump 130 is. Next, referring to FIG. 7, the first chip 120 and the second chip 160 are electrically connected by a second FPC board 180. In detail, in the present embodiment, a plurality of second circuit patterns 190 may be pre-printed on the second FPC board 180 by 3-D printing technique. Accordingly, when the second FPC board 180 is connected between the first chip 120 and the second chip 160, the first conductive bumps 130 and the second conductive bumps 170 may penetrate through two opposite ends of the second FPC board 180 respectively, and penetrate through the second circuit patterns 190 of the second FPC board 180 respectively, so as to electrically connect the first conductive bumps 130 and the second conductive bumps 180 through the second circuit patterns 190 of the second FPC board 180. As such, the manufacturing process of the semiconductor structure 100 of the present embodiment may be substantially done.

[0020] In sum, the present disclosure adopts the 3-D printing technique to form a plurality of conductive bumps on the chip and the substrate respectively. Then, a FPC board is configured to connect between the chip and the substrate, such that the conductive bumps on the chip and the substrate penetrate through two opposite ends of the FPC board respectively, so as to electrically connect the chip and the substrate through the FPC board.

[0021] With such configuration, the disclosure utilizes the flexibility of the FPC board to form the electrical connection between the chip and the substrate and/or between the chips, so the conventional wire-bonding process may be omitted, so as to avoid the problem of short circuit easily occurring between adjacent metal wires in the conventional wire-bonding process, and save the production cost of specific wire-bonding tools and wire-bonding platforms. Therefore, the semiconductor structure and manufacturing method thereof in the present disclosure may effectively improve yield rate, simplify manufacturing process and further reduce the production cost.

[0022] It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this disclosure provided they fall within the scope of the following claims and their equivalents.