Abstract:
The present invention relates to a semiconductor device, and more particularly to a manufacturing method for said semiconductor device. The semiconductor device comprises a die that connects with a substrate or a lead frame via an adhesion layer, a metal layer, and/or a back metal layer. Furthermore, the adhesion layer can be made of aluminum, and the die can connect with the substrate or the lead frame by ultrasonic bonding technology, which can avoid heat damaging the die during the manufacturing process.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority of U.S. Provisional Application No. 61/119,048 filed on 2 Dec. 2008 under 35 U.S.C. §119(e), the entire contents of all of which are hereby incorporated by reference. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates to a semiconductor device, and more particularly to a manufacturing method for said semiconductor device. 
       BACKGROUND 
       [0003]      FIG. 1  is a diagrammatic illustration of a semiconductor device in accordance with a prior art. The typical semiconductor device  10  comprises a substrate  11  and a die  13 . The die  13  comprises an active surface  131  and a back surface  133 , and is positioned on the top surface of the substrate  11 . Furthermore, a solder  15  is used to connect the die  13  and the substrate  11 . 
         [0004]    In the manufacturing process of semiconductor device  10 , the solder  15  can be formed on the top surface of the substrate  11 , and be heated to melt; for example, the solder  15  may melt at 300 degree centigrade. The die  13  can be positioned on the molten solder  15 . As the solder  15  has cooled, the die  13  can connect with the substrate  11  by means of the solder  15 . 
         [0005]    As the die  13  is placed on the molten solder  15 , the heat can flow from the molten solder  15  to the die  13 ; for example, the temperature of the die  13  may be about 300 degree centigrade. The heat may damage the die  13  and cause a reduction in the yield of the semiconductor device  10 . In addition, the high stress may be generated in the die  13  to cause to damage the structure of the die  13 . 
       SUMMARY OF THE INVENTION 
       [0006]    It is the primary objective of the present invention to provide a semiconductor device, wherein an adhesion layer that is made of aluminum can be positioned between the die and the lead frame or the substrate, such as the die can connect with the lead frame by means of the adhesion layer. 
         [0007]    It is a secondary objective of the present invention to provide a semiconductor device, wherein a metal layer can be formed on a substrate, and a die with an adhesion layer can be poisoned on the metal layer, such as the die can connect with the substrate easily. 
         [0008]    It is another objective of the present invention to provide a semiconductor device, wherein a back metal layer can be formed on the back surface of the die to benefit to form the adhesion layer on the die. 
         [0009]    It is another objective of the present invention to provide a manufacturing method for the semiconductor device, wherein the adhesion layer can be formed on the die or the substrate by a plating technology or an ultrasonic bonding technology to avoid to damage the die during the manufacturing process of the adhesion layer. 
         [0010]    It is another objective of the present invention to provide a manufacturing method for the semiconductor device, wherein the die can connect with the substrate or the lead frame with the adhesion layer by an ultrasonic bonding technology to avoid to damage the die during the manufacturing process. 
         [0011]    In an aspect of the present invention, a semiconductor device, comprising: a lead frame; a die positioned on the lead frame; and an adhesion layer positioned between the lead frame and the die, wherein the adhesion layer comprises aluminum. 
         [0012]    In an aspect of the present invention, a semiconductor device, comprising: a substrate; a die positioned on the substrate; and an adhesion layer positioned between the substrate and the die, wherein the adhesion layer comprises aluminum. 
         [0013]    In an aspect of the present invention, a manufacturing method of a semiconductor device, comprising the steps of: forming an adhesion layer on a substrate or a lead frame, wherein the adhesion layer comprises aluminum; and connecting the adhesion layer with a die. 
         [0014]    In an aspect of the present invention, a manufacturing method of a semiconductor device, comprising the steps of: forming an adhesion layer on a die, wherein the adhesion layer comprises aluminum; and connecting the adhesion layer with a lead frame or a substrate. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0015]      FIG. 1  is a diagrammatic illustration of a semiconductor device in accordance with a prior art. 
           [0016]      FIG. 2  is a diagrammatic illustration of a semiconductor device in accordance with an embodiment of the invention. 
           [0017]      FIG. 3  is a diagrammatic illustration of a semiconductor device in accordance with another embodiment of the invention. 
           [0018]      FIG. 4  is a diagrammatic illustration of a semiconductor device in accordance with another embodiment of the invention. 
           [0019]      FIG. 5  is a diagrammatic illustration of a semiconductor device in accordance with another embodiment of the invention. 
           [0020]      FIG. 6A  and  FIG. 6B  are diagrammatic illustrations of manufacturing process of a semiconductor device in accordance with an embodiment of the invention. 
           [0021]      FIG. 7A  and  FIG. 7B  are diagrammatic illustrations of manufacturing process of a semiconductor device in accordance with an embodiment of the invention. 
           [0022]      FIG. 8A  and  FIG. 8B  are diagrammatic illustrations of manufacturing process of a semiconductor device in accordance with an embodiment of the invention. 
           [0023]      FIG. 9A  and  FIG. 9B  are diagrammatic illustrations of manufacturing process of a semiconductor device in accordance with an embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0024]    Referring to  FIG. 2 , there is shown a diagrammatic illustration of a semiconductor device in accordance with an embodiment of the invention. The semiconductor device  20  comprises a die  23  that connects with a substrate  21  via an adhesion layer  25 , wherein the adhesion layer  25  can be made of aluminum. 
         [0025]    The die  23  comprises an active surface  231  and a back surface  233 , wherein the back surface  233  of the die  23  can connect with the substrate via the adhesion layer  25 . Furthermore, there is at least one bond pad  27  positioned on the active surface  231  of the die  23 , and a ball bond  291  can be positioned upon the bond pad  27  and connected with a lead  22  via a bonding wire  293 . 
         [0026]    Referring to  FIG. 3 , there is shown a diagrammatic illustration of a semiconductor device in accordance with another embodiment of the invention. The semiconductor device  30  comprises a die  23  that connects with a substrate  21  via an adhesion layer  25 , wherein the adhesion layer  25  can be made of aluminum. In addition, a back metal layer  34  is positioned between the adhesion layer  25  and the die  23 . 
         [0027]    The back metal layer  34  is formed on the back surface  233  of the die  23 , and the die  23  can connect with the substrate  21  vial the back metal layer  34  and the adhesion layer  25 . The adhesion layer  25  and the back metal layer  34  both are made of metal, so the die  23  with the back metal layer  34  can connect with the adhesion layer  25  more easily and stably. 
         [0028]    Referring to  FIG. 4 , there is shown a diagrammatic illustration of a semiconductor device in accordance with another embodiment of the invention. The semiconductor device  40  comprises a die  23  that connects with a substrate  21  via an adhesion layer  25 , wherein the adhesion layer  25  can be made of aluminum. In addition, a metal layer  46  is positioned between the adhesion layer  25  and the substrate  21 . 
         [0029]    The metal layer  46  is formed on the top surface of the substrate  21 , and the adhesion layer  25  can connect with the substrate  21  via the metal layer  46 . The adhesion layer  25  and the metal layer  46  both are made of metal, such that the adhesion layer  25  can connect with the metal layer  46  more easily and stably. 
         [0030]    More specifically, the semiconductor device  50  comprises the back metal layer  34 , the adhesion layer  25  and the metal layer  46  simultaneously. For example, the back metal layer  34  can be formed between the die  23  and the adhesion layer  25 , and the metal layer  46  can be formed between the adhesion layer  25  and the substrate  21 , such that the die  23  can connect with the substrate  21  by means of the back metal layer  34 , the adhesion layer  25 , and the metal layer  46 , as shown on  FIG. 5 . 
         [0031]    Referring to  FIG. 6A  and  FIG. 6B , there are shown diagrammatic illustrations of manufacturing process of a semiconductor device in accordance with an embodiment of the invention. An adhesion layer  25  that is made of aluminum can be formed on the top surface of the substrate  21 , wherein the adhesion layer  25  can be formed by plating technology or an ultrasonic bonding technology, as shown on  FIG. 6A . 
         [0032]    After forming the adhesion layer  25  on the substrate  21 , the die  23  can be positioned on the adhesion layer  25  to connect with the substrate  21  via the adhesion layer  25  by the ultrasonic bonding technology. For example, an ultrasonic vibration can be applied on the die  23 , and a pressure can be applied between the die  23  and the substrate  21 , such as the die  23  can connect with the substrate  21  by means of the adhesion layer  25 , as shown on  FIG. 6B . 
         [0033]    In another embodiment of the invention, the adhesion layer  25  can be formed on the back surface  233  of the die  23  firstly, and then the die  23  with the adhesion layer  25  can be positioned on the top surface of the substrate  21 . Thereafter, an ultrasonic vibration can be applied on the die  23 , and the substrate  21  can connect with the adhesion layer  25  of the die  23 . 
         [0034]    Referring to  FIG. 7A  and  FIG. 7B , there are shown diagrammatic illustrations of manufacturing process of a semiconductor device in accordance with another embodiment of the invention. An adhesion layer  25  that is made of aluminum can be formed on the top surface of the substrate  21 , and the back metal layer  34  can be formed on the back surface  233  of the die  23 , wherein the back metal layer  34  and the adhesion layer  25  can be formed by a plating technology or an ultrasonic bonding technology, as shown on  FIG. 7A . 
         [0035]    The die  23  with back metal layer  34  can be positioned on the adhesion layer  25  to connect with the substrate  21  by the ultrasonic bonding technology. For example, an ultrasonic vibration can be applied on the die  23 , and a pressure can be applied between the die  23  and the substrate  21 , such as the die  23  can connect with the substrate  21  by means of the back metal layer  34  and the adhesion layer  25 , as shown on  FIG. 7B . 
         [0036]    In another embodiment of the invention, the back metal layer  34  can be formed on the back surface  233  of the die  23 , and the adhesion layer  25  can be formed on the back metal layer  34 . After that, the die  23  with the back metal layer  34  and the adhesion layer  25  can be positioned on the top surface of the substrate  21 , such as the die  23  can connect with the substrate  21  by the ultrasonic bonding technology. 
         [0037]    Referring to  FIG. 8A  and  FIG. 8B , there are shown diagrammatic illustrations of manufacturing process of a semiconductor device in accordance with another embodiment of the invention. An adhesion layer  25  that is made of aluminum can be formed on the back surface  233  of the die  23 , and a metal layer  46  can be formed on the top surface of the substrate  21 , wherein the metal layer  46  and the adhesion layer  25  can be formed by plating technology or an ultrasonic bonding technology, as shown on  FIG. 8A . 
         [0038]    After forming the metal layer  46  on the substrate  21  and forming the adhesion layer  25  on the die  23 , the die  23  with the adhesion layer  25  can be positioned on the metal layer  46  to connect with the substrate  21  by the ultrasonic bonding technology. For example, an ultrasonic vibration can be applied on the die  23 , and a pressure can be applied between the die  23  and the substrate  21 , such as the die  23  can connect with the substrate  21  by means of the adhesion layer  25  and the metal layer  46 , as shown on  FIG. 8B . 
         [0039]    In another embodiment of the invention, the metal layer  46  and the adhesion layer  25  can be formed on the substrate  21  in turn, and the die  23  can be positioned on the adhesion layer  25 , such as the die  23  can connect with the substrate  21  via the adhesion layer  25  and the metal layer  46 . 
         [0040]    Preferably, the back metal layer  34 , the adhesion layer  25 , and the metal layer  46  can be formed between the die  23  and the substrate  21 . For example, the back metal layer  34  can be formed on the back surface  233  of the die  23 , the metal layer  46  can be formed on the top surface of the substrate  21 , and the adhesion layer  25  can be formed on the back metal layer  34  or on the metal layer  46 , such as the die  23  with the back metal layer  34  can connect with the substrate  21  with the metal layer  46  via the adhesion layer  25  by the ultrasonic bonding technology, as shown of FIG.  9 A and  FIG. 9B . 
         [0041]    In above embodiment of the invention, the die  23  is connected with the substrate  21 . Moreover, the substrate  21  also can be a lead frame  21 , such as the die  23  can be connected with the lead frame  21  via the adhesion layer  25 , the back metal layer  34  and/or the metal layer  46 . The lead frame  21  can be made of metal, such that the die  25  can connect with the lead frame  21  without the metal layer  34 . 
         [0042]    The present invention is not limited to the above-described embodiments. Various alternatives, modifications, and equivalents may be used. Therefore, the above embodiments should not be taken as limiting the scope of the invention, which is defined by the appending claims.