ELECTRONIC PACKAGE MODULE AND METHOD FOR FABRICATION OF THE SAME

An electronic package module and the method for fabrication of the same are provided. The method includes providing a circuit substrate with a first surface. An interposer frame and at least one first electronic component are disposed on the first surface. Subsequently, a first molding layer encapsulating the first electronic component and the interposer frame is formed on the first surface. A shielding material is disposed on the first molding layer, and thus the shielding material covers the interposer frame while the opening of the shielding material overlaps the electronic component. With the shielding material as the mask, a heat conductive solder is deposited on the first molding layer. After removing the shielding material, the interposer frame is connected to a main board. Therefore, the heat dissipation of the electronic component toward the main board accelerates due to the heat conductive solder.

RELATED APPLICATIONS

This application claims priority to China application Serial Number 202310146775.9, filed Feb. 8, 2023, which is herein incorporated by reference in its entirety.

BACKGROUND

Technical Field

The present disclosure relates to an electronic package module. More particular, the present disclosure relates to the electronic package module with heat conductive solder and the method for fabrication of the same.

Description of Related Art

Double sided surface mount technology (SMT) is to dispose the electronic components on two opposite surfaces of a circuit substrate, and to electronically connect the circuit substrate to a main board through a frame board. The electronic components are disposed on the circuit substrate, and thus, a double sided package structure is formed. Although this double sided package structure can increase the number of the disposed electronic components, the heat produced by the inner electronic components should be conducted to the surfaces of the package and directly dissipate by heat convection of the air, or should be conducted to the main board through the frame board.

However, one side of the double sided package structure is connected to the main board, so that the heat from the electric components near to the main board is difficult to be dissipated by heat convection of the air. Therefore, the heat dissipation rate is reduced, and the electronic components may be affected badly. Especially, the electronic components near to the main board may lead to serious problem of heat accumulation.

SUMMARY

Accordingly, the disclosure is to provide an electronic package module and the method for fabrication of the same, thereby improving the rate of heat dissipation.

At least one embodiment of the disclosure provides a method for fabricating an electronic package module, including providing a circuit substrate including a first surface; disposing an interposer frame and at least one first electronic component on the first surface, and the interposer frame includes an interface far away from the circuit substrate; forming a first molding layer on the first surface, and the first molding layer encapsulates the first electronic component and the interposer frame; disposing a shielding material on the first molding layer, this shielding material covers the interposer frame, and has at least one opening and the opening overlaps the first electronic component; depositing a heat conductive solder on the first molding layer with the shielding material as a mask, and the heat conductive solder does not directly contact the first electronic component; removing the shielding material after depositing the heat conductive solder; and connecting the interposer frame to a main board after removing the shielding material, and the interface of the interposer faces to the main board.

At least one embodiment of the disclosure provides an electronic package module. The electronic package module includes a circuit substrate having a first surface and a second surface; a first electronic component disposed on the first surface; an interposer frame disposed on the first surface and electrically connecting the circuit substrate; a first molding layer encapsulating the first electronic component and the interposer frame; and a heat conductive solder covering the first molding layer and the first electronic component. The first molding layer is located between the first electronic component and the heat conductive solder, and the first electronic component does not directly contact the heat conductive solder.

According to the aforementioned embodiments, a heat conductive solder is disposed on the side of the electronic package module facing to the main board, and on the region overlapping the electronic components. Since the heat conductive solder is located between the package module and the main board, the heat conductive rate transferring from the electronic components to the main board may be increased, thereby improving the heat dissipation rate of the electronic package module.

DETAILED DESCRIPTION

FIG.1AtoFIG.1Fillustrate sequent steps of the method for fabricating an electronic package module in accordance with at least one embodiment of present disclosure. Referring toFIG.1A, firstly, the circuit substrate100which includes the surface100fis provided. Afterwards, the interposer frame120and at least one electronic component140is disposed on the surface100fof the circuit substrate100as shown inFIG.1B. Although the figures of this embodiment illustrates three electronic components140, the number of the electronic components140is not limited to three but one and above in the present disclosure.

In some embodiments, the circuit substrate100may further include at least one solder mask (not shown), and the solder mask can cover the surface100fof the circuit substrate100while a plurality of pads (not shown) exposed on the surface100f.The electronic components140are soldered and mounted on the circuit substrate100by the plurality of solders102via these pads, so that the electronic components140are electrically connected to the circuit substrate100. The solders102may be solder balls, copper pillars or other connecting structures for electrically connection. Furthermore, the electronic components140may be electrically connected to the circuit substrate100with wire-bonding in other embodiments. The electronic components140may be packaged as a chip or unpackaged as a die.

Referring toFIG.1B, the interposer frame120includes the interface120iwhich is on the side far away from the circuit substrate100, that is, the interface120ibacks to the surface100fof the circuit substrate100. In this embodiment, the number of the interposer frame120is one, and the interposer frame120includes at least one opening122where the electronic components140are disposed. However, the number of the interposer frame120may be one and above, and each of the interposer frame120may include one and above openings122(for example, one opening122) in other embodiments.

In the same way for connecting the electronic components140to the circuit substrate100, the interposer frame120is electrically connected to the circuit substrate100by the plurality of solders102via the pads exposed on the circuit substrate100(not shown). It is worth mentioning, although the interface120iof the interposer frame120is above the top side of the electronic components140, the disclosure is not limited by this embodiment. In other embodiments, the interface120iof the interposer frame120may be below or flush with the top side of the electronic components140.

Referring toFIG.1C, the molding layer160is formed on the surface100fafter the interposer frame120and the electronic components140are disposed on the circuit substrate100, so that the molding layer160encapsulates the electronic components140and the interposer frame120. The material of the molding layer160may include organic resin (such as epoxy resin) or other isolation material, or similarity thereof. In this embodiment, the molding layer160encapsulates the electronic components140and the interposer frame120completely. However, in other embodiments, a part of the interface120iof the interposer frame120may be exposed from the molding layer160. In other word, the interposer frame120may be partially covered by the molding layer160.

Afterward, as shown inFIG.1D, the shielding material180is disposed on the molding layer160, so that the shielding material180covers the interposer frame120. Since the interface120iis not exposed from the molding layer160, the shielding material180does not directly contact the interposer frame120in the embodiment. However, the shielding material180may directly contact the interposer frame120in other embodiments.

FIG.2illustrates a local top view of the shielding material180. Referring toFIG.1DandFIG.2, the shielding material180has at least one opening182, and the opening182overlaps the electronic components140to uncover the electronic components140from the shielding material180. The shielding material180may be a steel stencil or other alloy stencil, but the shielding material180in present disclosure is not limited to a metal stencil. For example, the shielding material180may be a ceramic plate or a tape which includes polymers (such as polyimide tape).

AsFIG.2shown, the shielding material180may include the plurality of openings182. The number and the position of the openings182are configured in accordance with the openings122of the interposer frame120since the openings182should overlap the electronic components140while the electronic components140are disposed in the openings122of the interposer frame120. In addition, although the shielding material180covers the whole interposer frame120(even beyond the whole interposer frame120) in this embodiment, the present disclosure is not limited by this embodiment. In other embodiments, the shielding material180may cover the interposer frame120partially. In other words, the size and the shape of the openings182of the shielding material180may be different from the size and the shape of the openings122of the interposer frame120.

Referring toFIG.1E, the heat conductive solder190is deposited on the molding layer160with the shielding material180as the mask. It is noted that the heat conductive solder190does not directly contact the electronic components140since the molding layer160exists in in-between. In the embodiment, the heat conductive solder190may be deposited on the molding layer160by sputtering, stencil printing or other similar method. The material of the heat conductive solder190may include solder metals such as copper, tin or the alloy thereof.

As shown inFIG.3in which the shielding material180is omitted, the heat conductive solder190is deposited in each of the openings182as one single block in this embodiment. It is worth mentioning, the heat conductive solder190in each of the openings182(not denoted) may include a plurality of blocks in some embodiments. Referring toFIG.4illustrating another embodiment in which the shielding material180is omitted. For example, the plurality of blocks of the heat conductive solder190(not denoted) separated from each other are included in one single opening182(not denoted). As a result, the uniformity of the thickness of the heat conductive solder190may increase, so that the heat conductive solder190is prevented from flowing unevenly during the soldering.

The shielding material180is removed after the heat conductive solder190is deposited. In this embodiment, the circuit substrate100, the molding layer160and the interposer frame120are cut with, for example, machine cutting, laser cutting or ion beam cutting after the shielding material180is removed. Referring toFIG.1F, the cutting device p cut the circuit substrate100from the surface100sand along with the normal direction of the circuit substrate100, so that a plurality of isolated electronic package elements are formed. The cutting device p may be the cutting tool, the laser beam or the ion beam.

It should be noted, although the cutting is conducted after the heat conductive solder190is formed, the cutting is not limited to be in this sequence. In particular, the circuit substrate100, the molding layer160and the interposer frame120may be cut before the shielding material180is removed.

Referring toFIG.5, the interposer frame120is connected to the main board510after the shielding material180is removed and the electronic package elements are formed by cutting. The interface120iof the interposer frame120faces to the main board510in the connection, thus, the surface100fof the circuit substrate100faces to the main board510. In this step, the plurality of solder materials502are disposed on the interface120iof the interposer frame120. The material of the solder materials502may be the same as the material of the solders102. Afterwards, these solder materials502are connected to the main board510.

Furthermore, the main board510is soldered with the heat conductive solder190on the molding layer160, so that the main board510is connected to the molding layer160, thereby attaching the electronic package element to the main board510. The heat conductive solder190may be grounded via the main board510since the heat conductive solder190directly contacts the main board510.

Referring toFIG.5, the structure of the electronic package module in at least on embodiment is disclosed. The electronic package module50of this embodiment includes the circuit substrate100, the interposer frame120, the electronic components140, the molding layer160and the heat conductive solder190. The circuit substrate100has the surface100fand the surface100sopposite to the surface100f,and the electronic components140are mounted on the surface100fand electrically connected to the circuit substrate100via the plurality of solders102. The solders102may be solder balls, copper pillars or other connecting structures for electrically connection. Although the figures of this embodiment illustrate three electronic components140apiece, the number of the electronic components140is not limited to three but one and above in the present disclosure. In addition, the interposer frame120is on the surface100fand is electrically connected to the circuit substrate100via the plurality of solders102.

Referring toFIG.5, the molding layer160encapsulates the electronic components140and the interposer frame120. The material of the molding layer160may include organic resin (such as epoxy resin) or other isolation material, or similarity thereof. In this embodiment, the molding layer160encapsulates the electronic components140completely but exposes a part of the interposer frame120. In other words, the interposer frame120may be partially covered by the molding layer160.

The heat conductive solder190is on the molding layer160and overlaps the molding layer160and the electronic components140. As shown inFIG.5, the molding layer160is between the electronic components140and the heat conductive solder190while the electronic components140do not directly contact the heat conductive solder190in this embodiment. In other words, the electronic components140and the heat conductive solder190are separated by the molding layer160without any direct contact between each other. In addition, the molding layer160has the surface160ffar away from the circuit substrate100, and the heat conductive solder190is above the surface160f.However, the disclosure is not limited by this embodiment. In other embodiments, the heat conductive solder190may be below or flush with the surface160f.

The electronic package module50in the embodiment includes the main board510which connected to the heat conductive solder190. The interposer frame120and the electronic components140are between the circuit substrate100and the main board510, while the interposer frame120is electrically connected to the main board510via the plurality of solder materials502on the interposer frame120. The material of the solder materials502may be the same as the material of the solders102. The main board510includes the pads515, and the heat conductive solder190is connected to the main board510via these pads515in the embodiment. It is worth mentioning that at least one of the pads515may be electrically connected to the grounding circuit in order to ground the heat conductive solder190.

FIG.6AtoFIG.6Billustrate a cross-sectional view of a method for fabricating an electronic package module in accordance with another embodiment of the present disclosure, and the step ofFIG.6Acan follow up the step ofFIG.1C. The steps beforeFIG.6Aof this embodiment are the same as theFIG.1AtoFIG.1C, and thus, the descriptions of those steps are not repeated hereof.

Referring toFIG.6A, the electronic components640are disposed on the other surface100sof the circuit substrate100after the molding layer160is formed. The types of the electronic components640may be the same as the types of the electronic components140. The surface100fand the surface100sare on the opposite sides of the circuit substrate100, and the electronic components640may be electrically connected to the circuit substrate100via the plurality of solders602which may be the same as the solders102. Although the figures of this embodiment illustrate four electronic components140apiece, the number of the electronic components140is not limited to four but one and above (e.g. one electronic component140) in the present disclosure.

Referring toFIG.6B, the molding layer660is formed to encapsulate the electronic components640on the surface100safter the electronic components640are disposed and mounted. The material of the molding layer660may include organic resin (such as epoxy resin) or other isolation material, or similarity thereof.

The following steps of this embodiment afterFIG.6Bare similar to the steps of the aforementioned embodiment illustrated inFIG.1DtoFIG.1F. The difference between this embodiment and the aforementioned embodiment is that the electrical conductive layer670may be deposited on the molding layer660after the shielding material180is disposed, as shown inFIG.6C. Since the electrical conductive layer670completely covers the electronic components640, the electrical conductive layer670may electromagnetically shield the electronic components640. The material of the electrical conductive layer670may include metals (such as copper, nickel or alloys), conductive adhesive or other materials and may be deposited with spin coating, sputtering, chemical plating or other similar methods. It should be noted that the cutting process should be conducted before the electrical conductive layer670is deposited, so that the electrical conductive layer670can cover the side surfaces of the electronic components640.

FIG.7illustrates the cross-section view of the electronic package module70in accordance with another embodiment of present disclosure. The difference between the electronic package module70and the electronic package module50is that the electronic package module70further includes the electronic components640and the molding layer660. Four electronic components640are on the surface100sof the circuit substrate100in this embodiment, and the electronic components640are electrically connected to the circuit substrate100via the plurality of solders602. However, the number of the electronic components640is not limited by the embodiment while the number of the electronic components640may be one and above.

Moreover, other devices such as antennas may be disposed on the surface100sinstead of the electronic components640, and the electrical conductive layer670inFIG.6Cmay be excluded from the electronic package module70. The molding layer660completely covers the electronic components640in this embodiment. However, the molding layer660may partially cover the electronic components640or may cover none of the electronic components640in other embodiments.

In conclusion, the heat conductive rate transferring from the electronic components to the main board (that is, the heat transfers from the electronic components along with the direction leaving the circuit substrate) may be increased by disposing the heat conductive solder in the electronic package module, thereby improving the heat dissipation rate of the electronic package module. In addition, the bonding strength between the electronic package elements and the main board may be enhanced since the heat conductive solder is soldered on the main board. Therefore, the reliability of the connection between solders and the main board are increased.

Although the embodiments of the present disclosure have been disclosed as above in the embodiments, they are not intended to limit the embodiments of the present disclosure. Any person having ordinary skill in the art can make various changes and modifications without departing from the spirit and the scope of the embodiments of the present disclosure. Therefore, the protection scope of the embodiments of the present disclosure should be determined according to the scope of the appended claims.