Patent Publication Number: US-9899300-B2

Title: Semiconductor device

Description:
This application is a Continuation of U.S. Ser. No. 15/096,792, filed Apr. 12, 2016, now U.S. Pat. No. 9,640,455, which is a Continuation of U.S. Ser. No. 14/669,169, filed Mar. 26, 2015, now U.S. Pat. No. 9,355,988, the content of each of whice is incorporate herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a semiconductor device. 
     2. Description of Related Art 
     In a semiconductor device having a built-in semiconductor element, a conduction supporting member that constitutes a conduction path to the semiconductor device and supports the semiconductor element is used. In such a semiconductor device, a lead made of a metal is used as the conduction supporting member. A plurality of wires made of Au or the like are used as means for electrically connecting the semiconductor element to the lead. Known documents relating to semiconductor devices include JP-A-2014-7363, for example. 
     In the manufacturing process of the semiconductor device, a process for bonding the plurality of wires is executed. This bonding process is performed sequentially on the plurality of wires, and cannot be executed collectively on the plurality of wires. This is thus an impediment to improving the manufacturing efficiency of the semiconductor device. Also, the wires are comparatively thin, and thus could possibly be unintentionally cut or separate during the manufacturing process of the semiconductor device or use of the semiconductor device. Also, in the case of joining the semiconductor device to a heat dissipation member called an island or the like, the semiconductor device and the heat dissipation member are joined via a joining material. Improved efficiency and increased reliability of this junction are desired. 
     SUMMARY OF THE INVENTION 
     The present invention has been proposed under the above circumstances, and an object of the present invention is to provide a semiconductor device that can enhance manufacturing efficiency and enables the semiconductor element to be more reliably joined to the conduction connection member. Also, another object of the present invention is to provide a semiconductor device that can enhance manufacturing efficiency and enables the semiconductor element to be more reliably joined to the heat dissipation member. 
     A semiconductor device according to a first aspect of the present invention is provided with a semiconductor element having a functional surface on which a functional circuit is formed and a back surface facing in an opposite direction to the functional surface, a conduction supporting member supporting the semiconductor element and electrically connected to the semiconductor element, and a resin package at least partially covering the semiconductor element and the conduction supporting member, the semiconductor element having a functional surface side electrode formed on the functional surface and equipped with a functional surface side raised part that projects in a direction in which the functional surface faces, and the functional surface side raised part of the functional surface side electrode being joined to the conduction supporting member by solid state bonding. 
     Preferably, the functional surface side electrode has a base layer that contacts the functional surface. 
     Preferably, the base layer is made of Al. 
     Preferably, the functional surface side raised part and the base layer do not overlap with each other in plan view. 
     Preferably, the functional surface side electrode has a foundation layer laminated on the base layer. 
     Preferably, the foundation layer is made of one of Ti, W and Ta. 
     Preferably, the functional surface side electrode has a redistribution layer laminated on the foundation layer, and the functional surface side raised part is formed on the redistribution layer. 
     Preferably, the redistribution layer is made of Cu. 
     Preferably, the redistribution layer is larger than the base layer in plan view. 
     Preferably, the functional surface side electrode has a joining promotion layer that is positioned as an uppermost layer. 
     Preferably, the joining promotion layer of the functional surface side electrode contains at least one of Ni and Pd. 
     Preferably, the joining promotion layer of the functional surface side electrode has a Ni layer laminated on the functional surface side raised part and a Pd layer laminated on the Ni layer. 
     Preferably, the semiconductor device is provided with a passivation film covering the functional surface and having formed therein a through hole that allows the functional surface side electrode to reach the functional surface. 
     Preferably, the passivation film is made of SiN. 
     Preferably, the redistribution layer overlaps with the passivation film in plan view. 
     Preferably, the functional surface side raised part overlaps with the passivation film in plan view. 
     Preferably, the semiconductor device is provided with a protective film laminated on the passivation film. 
     Preferably, the protective film is made of polyimide. 
     Preferably, the redistribution layer overlaps with the protective film in plan view. 
     Preferably, the functional surface side raised part overlaps with the protective film in plan view. 
     Preferably, the functional surface side raised part is made of Cu. 
     Preferably, the conduction supporting member is a lead made of a metal. 
     Preferably, a portion of the lead projects from the resin package. 
     Preferably, a surface of the lead on an opposite side to a region where the lead is joined to the functional surface side electrode has unevenness. 
     Preferably, the semiconductor device has a plurality of the functional surface side electrode. 
     Preferably, the functional surface side electrode has a plurality of the functional surface side raised part. 
     Preferably, the semiconductor device is further provided with a heat dissipation member joined to the semiconductor element, the semiconductor element has a back surface metal layer formed on the back surface, and the back surface metal layer of the semiconductor element is joined to the heat dissipation member by solid state bonding. 
     Preferably, a joining promotion layer is laminated on the back surface metal layer. 
     Preferably, the joining promotion layer on the back surface metal layer contains at least one of Ni and Pd. 
     Preferably, a joining promotion layer is laminated on the heat dissipation member. 
     Preferably, the joining promotion layer on the heat dissipation member contains at least one of Ni and Pd. 
     Preferably, a surface of the heat dissipation member on an opposite side to a region where the heat dissipation member is joined to the back surface metal layer has unevenness. 
     Preferably, a surface of the heat dissipation member on an opposite side to a region where the heat dissipation member is joined to the back surface metal layer is exposed from the resin package. 
     A semiconductor device according to a second aspect of the present invention is provided with a semiconductor element having a functional surface on which a functional circuit is formed and a back surface facing in an opposite direction to the functional surface, a conduction supporting member supporting the semiconductor element and electrically connected to the semiconductor element, and a resin package at least partially covering the semiconductor element and the conduction supporting member, the semiconductor element having a functional surface side electrode formed on the functional surface, the conduction supporting member having a conduction supporting member side raised part that projects toward the functional surface side electrode, and the functional surface side electrode being joined to the conduction supporting member side raised part of the conduction supporting member by solid state bonding. 
     Preferably, the functional surface side electrode has a base layer that contacts the functional surface. 
     Preferably, the base layer is made of Al. 
     Preferably, the conduction supporting member side raised part and the base layer do not overlap with each other in plan view. 
     Preferably, the functional surface side electrode has a foundation layer laminated on the base layer. 
     Preferably, the foundation layer is made of one of Ti, W and Ta. 
     Preferably, the functional surface side electrode has a redistribution layer laminated on the foundation layer. 
     Preferably, the redistribution layer is made of Cu. 
     Preferably, the redistribution layer is larger than the base layer in plan view. 
     Preferably, the functional surface side electrode has a joining promotion layer that is positioned as an uppermost layer. 
     Preferably, the joining promotion layer of the functional surface side electrode contains at least one of Ni and Pd. 
     Preferably, the joining promotion layer of the functional surface side electrode has a Ni layer that is positioned on the functional surface side and a Pd layer laminated on the Ni layer. 
     Preferably, the semiconductor device is provided with a passivation film covering the functional surface and having formed therein a through hole that allows the functional surface side electrode to reach the functional surface. 
     Preferably, the passivation film is made of SiN. 
     Preferably, the redistribution layer overlaps with the passivation film in plan view. 
     Preferably, the conduction supporting member side raised part overlaps with the passivation film in plan view. 
     Preferably, the semiconductor device is provided with a protective film laminated on the passivation film. 
     Preferably, the protective film is made of polyimide. 
     Preferably, the redistribution layer overlaps with the protective film in plan view. 
     Preferably, the conduction supporting member side raised part overlaps with the protective film in plan view. 
     Preferably, the conduction supporting member is a lead made of a metal. 
     Preferably, a portion of the lead projects from the resin package. 
     Preferably, a surface of the lead on an opposite side to a region where the lead is joined to the functional surface side electrode has unevenness. 
     Preferably, the conduction supporting member side raised part is constituted by a portion that is thicker than a surrounding portion. 
     Preferably, the conduction supporting member side raised part has a through hole formed therein. 
     Preferably, the conduction supporting member side raised part is formed from a bent portion of the conduction supporting member. 
     Preferably, the semiconductor device has a plurality of the functional surface side electrode. 
     Preferably, the functional surface side electrode is joined to the plurality of conduction supporting member side raised parts. 
     Preferably, the semiconductor device is further provided with a heat dissipation member joined to the semiconductor element, the semiconductor element has a back surface metal layer formed on the back surface, and the back surface metal layer of the semiconductor element is joined to the heat dissipation member by solid state bonding. 
     Preferably, a joining promotion layer is laminated on the back surface metal layer. 
     Preferably, the joining promotion layer on the back surface metal layer contains at least one of Ni and Pd. 
     Preferably, a joining promotion layer is laminated on the heat dissipation member. 
     Preferably, the joining promotion layer on the heat dissipation member contains at least one of Ni and Pd. 
     Preferably, a surface of the heat dissipation member on an opposite side to a region where the heat dissipation member is joined to the back surface metal layer has unevenness. 
     Preferably, a surface of the heat dissipation member on an opposite side to a region where the heat dissipation member is joined to the back surface metal layer is exposed from the resin package. 
     A semiconductor device according to a third aspect of the present invention is provided with a semiconductor element having a functional surface on which a functional circuit is formed and a back surface facing in an opposite direction to the functional surface, a conduction supporting member supporting the semiconductor element and electrically connected to the semiconductor element, a heat dissipation member joined to the semiconductor element, and a resin package at least partially covering the semiconductor element, the conduction supporting member and the heat dissipation member, the semiconductor element having a back surface metal layer formed on the back surface, and the back surface metal layer of the semiconductor element being joined to the heat dissipation member by solid state bonding. 
     Preferably, a joining promotion layer is laminated on the back surface metal layer. 
     Preferably, the joining promotion layer on the back surface metal layer contains at least one of Ni and Pd. 
     Preferably, a joining promotion layer is laminated on the heat dissipation member. 
     Preferably, the joining promotion layer on the heat dissipation member contains at least one of Ni and Pd. 
     Preferably, a surface of the heat dissipation member on an opposite side to a region where the heat dissipation member is joined to the back surface metal layer has unevenness. 
     Preferably, the semiconductor element has a functional surface side electrode formed on the functional surface. 
     Preferably, the functional surface side electrode is equipped with a functional surface side raised part that projects in a direction in which the functional surface faces, and the functional surface side raised part of the functional surface side electrode is joined to the conduction supporting member by solid state bonding. 
     Preferably, the conduction supporting member has a conduction supporting member side raised part that projects toward the functional surface side electrode, and the functional surface side electrode is joined to the conduction supporting member side raised part of the conduction supporting member by solid state bonding. 
     Preferably, the functional surface side electrode has a base layer that contacts the functional surface. 
     Preferably, the base layer is made of Al. 
     Preferably, the functional surface side electrode has a foundation layer laminated on the base layer. 
     Preferably, the foundation layer is made of one of Ti, W and Ta. 
     Preferably, the functional surface side electrode has a redistribution layer laminated on the foundation layer. 
     Preferably, the redistribution layer is made of Cu. 
     Preferably, the redistribution layer is larger than the base layer in plan view. 
     Preferably, the functional surface side electrode has a joining promotion layer that is positioned as an uppermost layer. 
     Preferably, the joining promotion layer of the functional surface side electrode contains at least one of Ni and Pd. 
     Preferably, the semiconductor device is provided with a passivation film covering the functional surface and having formed therein a through hole that allows the functional surface side electrode to reach the functional surface. 
     Preferably, the passivation film is made of SiN. 
     Preferably, the redistribution layer overlaps with the passivation film in plan view. 
     Preferably, the semiconductor device is provided with a protective film laminated on the passivation film. 
     Preferably, the protective film is made of polyimide. 
     Preferably, the redistribution layer overlaps with the protective film in plan view. 
     Preferably, the conduction supporting member is a lead made of a metal. 
     Preferably, a portion of the lead projects from the resin package. 
     Preferably, a surface of the lead on an opposite side to a region where the lead is joined to the functional surface side electrode has unevenness. 
     Other features and advantages of the present invention will become apparent from the following detailed description with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION IN THE DIAGRAMS 
         FIG. 1  is a plan view showing a semiconductor device that is based on a first embodiment of the present invention. 
         FIG. 2  is a bottom view showing the semiconductor device of  FIG. 1 . 
         FIG. 3  is a front view showing the semiconductor device of  FIG. 1 . 
         FIG. 4  is a side view showing the semiconductor device of  FIG. 1 . 
         FIG. 5  is a cross-sectional view along a line V-V in  FIG. 1 . 
         FIG. 6  is an enlarged cross-sectional view showing a main section of the semiconductor device of  FIG. 1 . 
         FIG. 7  is an enlarged cross-sectional view showing a main section of an exemplary method for making the semiconductor device of  FIG. 1 . 
         FIG. 8  is an enlarged cross-sectional view showing a main section of an exemplary method for making the semiconductor device of  FIG. 1 . 
         FIG. 9  is an enlarged cross-sectional view showing a main section of an exemplary method for making the semiconductor device of  FIG. 1 . 
         FIG. 10  is an enlarged cross-sectional view showing a main section of an exemplary method for making the semiconductor device of  FIG. 1 . 
         FIG. 11  is an enlarged cross-sectional view showing a main section of an exemplary method for making the semiconductor device of  FIG. 1 . 
         FIG. 12  is an enlarged cross-sectional view showing a main section of an exemplary method for making the semiconductor device of  FIG. 1 . 
         FIG. 13  is a cross-sectional view showing an exemplary method for making the semiconductor device of  FIG. 1 . 
         FIG. 14  is an enlarged cross-sectional view showing a main section of an exemplary method for making the semiconductor device of  FIG. 1 . 
         FIG. 15  is a plan view showing a semiconductor device that is based on a second embodiment of the present invention. 
         FIG. 16  is a bottom view showing the semiconductor device of  FIG. 15 . 
         FIG. 17  is a front view showing the semiconductor device of  FIG. 15 . 
         FIG. 18  is a side view showing the semiconductor device of  FIG. 15 . 
         FIG. 19  is a cross-sectional view along a line XIX-XIX in  FIG. 1 . 
         FIG. 20  is an enlarged cross-sectional view showing a main section of the semiconductor device of  FIG. 15 . 
         FIG. 21  is an enlarged cross-sectional view showing a main section of a modification of the semiconductor device of  FIG. 15 . 
         FIG. 22  is an enlarged cross-sectional view showing a main section of another modification of the semiconductor device of  FIG. 15 . 
         FIG. 23  is an enlarged cross-sectional view showing a main section of another modification of the semiconductor device of  FIG. 15 . 
         FIG. 24  is an enlarged cross-sectional view showing a main section of another modification of the semiconductor device of  FIG. 15 . 
         FIG. 25  is a plan view showing a semiconductor device that is based on a third embodiment of the present invention. 
         FIG. 26  is a bottom view showing the semiconductor device of  FIG. 25 . 
         FIG. 27  is a front view showing the semiconductor device of  FIG. 25 . 
         FIG. 28  is a side view showing the semiconductor device of  FIG. 25 . 
         FIG. 29  is a cross-sectional view along a line XXIX-XXIX in  FIG. 25 . 
         FIG. 30  is an enlarged cross-sectional view showing a main section of the semiconductor device of  FIG. 25 . 
         FIG. 31  is an enlarged cross-sectional view showing a main section of a modification of the semiconductor device of  FIG. 25 . 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 
       FIGS. 1 to 6  show a semiconductor device that is based on a first embodiment of the present invention. A semiconductor device A 1  of the present embodiment is provided with leads  101  to  107 , a semiconductor element  300 , and a sealing resin  400 . 
       FIG. 1  is a plan view showing the semiconductor device A 1 .  FIG. 2  is a bottom view showing the semiconductor device A 1 .  FIG. 3  is a front view showing the semiconductor device A 1 .  FIG. 4  is a side view showing the semiconductor device A 1 .  FIG. 5  is a cross-sectional view along a line V-V in  FIG. 1 .  FIG. 6  is an enlarged cross-sectional view showing a main section of the semiconductor device A 1 . 
     The leads  101  to  107  are examples of a conduction supporting member as referred to in the present invention. The leads  101  to  107  constitute conduction paths between the semiconductor element  300  and outside the semiconductor device A 1 , and support the semiconductor element  300 . The leads  101  to  107  are made of a metal, and are preferably made of either Cu or Ni, an alloy thereof, alloy 42, or the like. Also, a plating layer of Ti, Ag, Pd, Au or the like may be provided on the surface of the leads  101  to  107 . The present embodiment will be described taking the case where the leads  101  to  107  are made of Cu as an example. The leads  101  to  107  are not particularly limited in thickness, and have, for example, a thickness of 50 μm to 500 μm, and preferably 100 μm to 150 μm. 
     The leads  101  to  107  each have an opposing part  110  and a terminal part  120 . The opposing part  110  overlaps with the semiconductor element  300  in plan view, and opposes a functional surface side electrode  330  of the semiconductor element  300  which will be discussed later. The terminal part  120  is exposed from the sealing resin  400  and is used for mounting the semiconductor device A 1  to a circuit board or the like. As shown in  FIGS. 3 and 5 , the leads  101  to  107  have a bent part between the opposing part  110  and the terminal part  120 . Also, the lead  101  has two terminal parts  120 . 
     As shown in  FIG. 5 , the opposing parts  110  have a joining surface  113  and a back surface  114 . The joining surfaces  113  face the functional surface side electrodes  330  of the semiconductor element  300 , and are joined to the functional surface side electrodes  330 . The back surfaces  114  face in the opposite direction to the joining surfaces  113 . 
     As shown in  FIGS. 2 and 6 , the back surface  114  of the opposing part  110  has unevenness. This uneven portion has a depth of about 20 μm, for example. 
     In the present embodiment, as shown in  FIG. 1 , the terminal parts  120  of the leads  101 ,  104  and  106  project to the left in the diagram. Also, the terminal parts  120  of the leads  102 ,  103 ,  105  and  107  project to the right in the diagram. The opposing part  110  of the lead  101  is comparatively large. The opposing parts  110  of the leads  102  and  103  are smaller than the opposing part  110  of the lead  101 , and are aligned in the y direction. The opposing part  110  of the lead  101  is aligned in the x direction with the opposing parts  110  of the leads  102  and  103 . The opposing parts  110  of the leads  104 ,  105 ,  106  and  107  are comparatively small. The opposing parts  110  of the leads  106  and  107  are disposed so as to be aligned in the x direction toward the center in the x direction. The opposing parts  110  of the leads  104  and  105  are disposed on either side in the x direction with the opposing parts  110  of the leads  106  and  107  sandwiched therebetween. 
     The semiconductor element  300  is an element that exhibits the functions of the semiconductor device A 1  and is not particularly limited in type, with it being possible to select from various types of elements such as a transistor, a diode or an LSI. As shown in  FIG. 5 , the semiconductor element  300  has a functional surface  310  and a back surface  320 . The back surface  320  has formed thereon a functional circuit (not shown) that realizes the functions of the semiconductor element  300 . The back surface  320  faces in the opposite direction to the functional surface  310 . The semiconductor element  300  is manufactured from a wafer made of Si or the like, for example. 
     The semiconductor element  300  has a plurality of functional surface side electrodes  330 , a passivation film  340 , and a protective film  350 . 
     The plurality of functional surface side electrodes  330  are formed on the functional surface  310  and are each electrically connected to a different one of the leads  101  to  107 . In the present embodiment, seven functional surface side electrodes  330  are formed in correspondence with the leads  101  to  107 . These functional surface side electrodes  330  have a common basic configuration despite differing in size and disposition. 
     In the present embodiment, as shown in  FIG. 1 , the functional surface side electrode  330  that opposes the opposing part  110  of the lead  101  is comparatively large, and has an oblong shape in plan view with the longitudinal direction being in the y direction. The two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  102  and  103  have a substantially square shape in plan view and are aligned in the y direction. The functional surface side electrode  330  that opposes the opposing part  110  of the lead  101  is aligned in the x direction with the two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  102  and  103 . The four functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  104 ,  105 ,  106  and  107  are comparatively small and have a substantially square shape in plan view. The two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  106  and  107  are disposed so as to be aligned in the x direction toward the center in the x direction. The two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  104  and  105  are disposed on either side in the x direction with the opposing parts  110  of the leads  106  and  107  sandwiched therebetween. 
     As shown in  FIGS. 1, 5 and 6 , the functional surface side electrodes  330  have a base layer  331 , a foundation layer  332 , a redistribution layer  333 , a functional surface side raised part  334 , and a joining promotion layer  335 . 
     The base layer  331  contacts the functional surface  310 , and is electrically connected directly to an appropriate place of the functional circuit on the functional surface  310 . The functional surface  310  is made of Al, for example. The base layer  331  has a thickness of 0.1 μm to 10 μm, for example. 
     Here, the passivation film  340  and the protective film  350  will be described. The passivation film  340  is for preventing an excessive force from being loaded on the Si which is a main constituent of the semiconductor element  300 , and is made of an insulating material such as SiN, for example. The passivation film  340  has a thickness of 200 nm to 3 μm, for example. The protective film  350  is laminated on the passivation film  340 , and is for preventing an excessive force from being loaded on the Si which is a main constituent of the semiconductor element  300  and for facilitating formation of the redistribution layer  333 . The protective film  350  is made of an insulating material such as polyimide, for example. The protective film  350  has a thickness of about 5 μm, for example. 
     A through hole  341  is formed in the passivation film  340 . The through hole  341  is provided in order to expose the base layer  331  of the functional surface side electrode  330 . In the present embodiment, the portion of the passivation film  340  surrounding the through hole  341  covers an end edge of the base layer  331 . A through hole  351  is formed in the protective film  350 . The through hole  351  coincides with the through hole  341  in plan view, and is provided in order to expose the base layer  331  of the functional surface side electrode  330 . 
     Description will now return to the functional surface side electrodes  330 . The foundation layer  332  provides a foundation for forming the redistribution layer  333 . The foundation layer  332  coincides in shape with the functional surface side electrode  330  in plan view. That is, the foundation layer  332  covers the portion of the base layer  331  exposed from the passivation film  340  and the protective film  350 , the through hole  341  in the passivation film  340 , the through hole  351  in the protective film  350 , and an appropriate region of the protective film  350 . The foundation layer  332  is made of Ti, TiW, Ta or the like, for example. The foundation layer  332  has a thickness of about 100 nm. 
     The redistribution layer  333  is a main constituent of the functional surface side electrode  330 , and is larger than the base layer  331  in plan view. The redistribution layer  333  is not particularly limited in material, and is made of Cu in the present embodiment. The redistribution layer  333  has a thickness of about 10 μm, for example. 
     The functional surface side raised part  334  is formed on the redistribution layer  333  and projects in the direction in which the functional surface  310  faces. The functional surface side raised part  334  is not particularly limited in material as long as the material is a conductive material, and is made of Cu in the present embodiment. Also, the functional surface side raised part  334  is not particularly limited in shape, and has a columnar shape in the present embodiment. The functional surface side raised part  334  has a diameter of 25 μm to 200 μm and a height of 10 μm to 500 μm. In plan view, the functional surface side raised part  334  is disposed in a position that avoids the base layer  331  so as to not overlap with the base layer  331 . Also, the functional surface side raised part  334  overlaps with the passivation film  340  and the protective film  350  in plan view. 
     Also, in the present embodiment, as shown in  FIG. 1 , a plurality of functional surface side raised parts  334  are formed on the three functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  101 ,  102  and  103 . Eight functional surface side raised parts  334  are formed in four rows and two columns on the functional surface side raised part  334  that opposes the opposing part  110  of the lead  101 . Four functional surface side raised parts  334  are formed in two rows and two columns on the functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  102  and  103 . One functional surface side raised part  334  each is formed on the functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  104  to  107 . 
     The joining promotion layer  335  constitutes the uppermost layer of the functional surface side electrode  330 , and, in the present embodiment, covers the functional surface side raised parts  334  and the redistribution layer  333 . The joining promotion layer  335  is for strengthening the junction between the functional surface side electrodes  330  and the opposing parts  110  of the leads  101  to  107 . The joining promotion layer  335  contains at least one of Ni and Pd, and, in the present embodiment, consists of a Ni layer that directly covers the functional surface side raised parts  334  and the redistribution layer  333  and a Pd layer laminated on this Ni layer. The joining promotion layer  335  has a thickness of about 100 nm to 10 μm, for example. Also, apart from the materials given above, Cu, Al, Ti, Au or the like can be employed as appropriate as the material of the joining promotion layer  335 . 
     The functional surface side electrodes  330  are joined to the opposing parts  110  of the leads  101  to  107  by solid state bonding. More specifically, the top faces of the functional surface side raised parts  334  are solid state bonded to the joining surfaces  113  of the opposing parts  110 . Note that, in the present embodiment, a configuration is adopted in which the joining promotion layer  335  is interposed between the functional surface side raised parts  334  and the joining surfaces  113  of the opposing parts  110 . Note that a joining promotion layer may be formed on the joining surfaces  113  of the opposing parts  110 , in addition to or instead of forming the joining promotion layer  335  on the functional surface side electrodes  330 . 
     The sealing resin  400  entirely covers the semiconductor element  300  and covers the leads  101  to  107  except for the terminal parts  120 . The sealing resin  400  is made of an insulating material, and, in the present embodiment, is made of a black epoxy resin, for example. In the present embodiment, the sealing resin  400  is also filled between the joining surfaces  113  of the opposing parts  110  and the joining promotion layers  335  of the functional surface side electrodes  330 , in areas avoiding the functional surface side raised parts  334 . 
     Next, an exemplary method for making the semiconductor device A 1  will be described hereinafter. 
     First, as shown in  FIG. 7 , the base layer  331  is formed on the semiconductor element  300 . The base layer  331  is electrically connected to an appropriate place of a functional circuit (not shown) formed on the functional surface  310  of the semiconductor element  300 . The base layer  331  is patterned by plating using Al, for example. The base layer  331  has a thickness of 0.1 μm to 10 μm, for example. 
     Next, as shown in  FIG. 8 , the passivation film  340  and the protective film  350  are formed. Formation of the passivation film  340  and the protective film  350  is performed by forming a SiN film and a polyimide film, for example, over the entire functional surface  310 . The SiN film has a thickness of 200 nm to 3 μm, for example. Also, the polyimide film has a thickness of about 5 μm, for example. The through hole  341  and the through hole  351  that expose the base layer  331  are then formed in the SiN film and the polyimide film by patterning such as etching. The passivation film  340  and the protective film  350  are thereby obtained. 
     Next, as shown in  FIG. 9 , the foundation layer  332  is formed. Specifically, a film is made of Ti, TiW, Ta or the like and having a thickness of about 100 nm is formed, so as to cover the portion of the base layer  331  that is exposed from the passivation film  340  and the protective film  350 , the through hole  341 , the through hole  351 , and the protective film  350 . The film forming method is not particularly limited, and CVD, spattering or the like can be used. Note that the shape, size and disposition of the foundation layer  332  correspond to the shape, size and disposition of the functional surface side electrodes  330  to be formed. 
     Next, as shown in  FIG. 10 , the redistribution layer  333  is formed. The redistribution layer  333  is formed by electrolytic plating using the foundation layer  332 , for example. The redistribution layer  333  is made of Cu, for example, and has a thickness of about 10 μm. The shape, size and disposition of the redistribution layer  333  substantially match the foundation layer  332 . 
     Next, as shown in  FIG. 11 , the functional surface side raised parts  334  are formed. The functional surface side raised parts  334  are formed through a combination of plating, sputtering and patterning, for example. For example, a mask having openings that coincide with the shape of the functional surface side raised parts  334  in plan view is prepared, and Cu is adhered by plating or sputtering using this mask. Alternatively, the functional surface side raised parts  334  are formed by performing processing such as etching on a Cu film formed by plating or sputtering. 
     Next, as shown in  FIG. 12 , the joining promotion layer  335  is formed. Formation of the joining promotion layer  335  is performed by sequentially forming a Ni layer and a Pd layer by plating, for example, so as to cover the redistribution layer  333  and the functional surface side raised parts  334 . The joining promotion layer  335  has a thickness of 100 nm to 10 μm, for example. 
     Next, as shown in  FIG. 13 , the joining surfaces  113  of the opposing parts  110  of the leads  101  to  107  are joined to the plurality of functional surface side electrodes  330  of the semiconductor element  300 . This junction is realized by fixing the semiconductor element  300  to a table  801 , and pressing a jig  802  against the back surfaces  114  of the opposing parts  110  of the leads  101  to  107 , for example. A plurality of protrusions are formed in a lower surface of the jig  802  in the diagram. The jig  802  is vibrated in an xy plane, with a predetermined pressing force being applied to the leads  101  to  107  by the jig  802 . This vibration is low frequency compared with ultrasonic waves, for example, and is, for example, 100 Hz or less, and specifically 50 Hz to 60 Hz. As shown in  FIG. 14 , the functional surface side raised parts  334  are thereby solid state bonded to the opposing parts  110  with the joining promotion layer  335  sandwiched therebetween. Also, the back surfaces  114  of the opposing parts  110  are formed to have unevenness with the marks left by the jig  802  having been pressed thereagainst. 
     Thereafter, the semiconductor device A 1  is obtained by undergoing a process for forming the sealing resin  400 . 
     Next, workings of the semiconductor device A 1  will be described. 
     According to the present embodiment, the functional surface side raised parts  334  are joined to the opposing parts  110  of the leads  101  to  107  by solid state bonding. Solid state bonding involves both sides being directly joined to each other and does not require a joining medium interposed between both sides, such as wire or solder. Also, the solid state bonding of all of the functional surface side raised parts  334  and the opposing parts  110  of the leads  101  to  107  can be performed collectively. The manufacturing efficiency of the semiconductor device A 1  can thereby be improved. Also, the joining strength of the functional surface side raised parts  334  with the opposing parts  110  of the leads  101  to  107  can be enhanced. 
     As a result of providing the functional surface side raised parts  334 , it is possible to reduce the area of the junction between the functional surface side electrodes  330  and the opposing parts  110  of the leads  101  to  107 . The force that needs to be applied in order to obtain a predetermined joining pressure at the time of solid state bonding can thereby be reduced. The semiconductor element  300  can thereby be prevented from being unintentionally damaged or the like. Also, as a result of providing the functional surface side raised parts  334 , the sealing resin  400  can be reliably filled between the functional surface  310  of the semiconductor element  300  and the joining surfaces  113  of the opposing parts  110  of the leads  101  to  107 . Places that need to be insulated in the semiconductor device A 1  can thereby be more reliably insulated. 
     As a result of the functional surface side raised parts  334  not overlapping with the base layer  331  in plan view, it is possible to avoid the force at the time of solid state bonding being excessively loaded on the Si forming a main constituent of the semiconductor element  300 . Also, as a result of the functional surface side raised parts  334  being overlapped with the passivation film  340  and the protective film  350  in plan view, the force at the time of solid state bonding can be absorbed by the passivation film  340  and the protective film  350 . 
     As a result of providing the joining promotion layer  335 , solid state bonding of the functional surface side raised parts  334  to the opposing parts  110  can be performed more reliably. 
       FIGS. 15 to 31  show other embodiments of the present invention. Note that, in these diagrams, elements that are the same as or similar to the above embodiment are given the same reference numerals. 
       FIGS. 15 to 20  show a semiconductor device that is based on a second embodiment of the present invention. A semiconductor device A 2  of the present embodiment is provided with leads  101  to  107 , a semiconductor element  300 , and a sealing resin  400 . 
       FIG. 15  is a plan view showing the semiconductor device A 2 .  FIG. 16  is a bottom view showing the semiconductor device A 2 .  FIG. 17  is a front view showing the semiconductor device A 2 .  FIG. 18  is a side view showing the semiconductor device A 2 .  FIG. 19  is a cross-sectional view along a line XIX-XIX in  FIG. 15 .  FIG. 20  is an enlarged cross-sectional view showing a main section of the semiconductor device A 2 . 
     The leads  101  to  107  are examples of a conduction supporting member as referred to in the present invention. The leads  101  to  107  constitute conduction paths between the semiconductor element  300  and outside the semiconductor device A 2 , and support the semiconductor element  300 . The leads  101  to  107  are made of a metal, and are preferably made of either Cu or Ni, an alloy thereof, alloy 42, or the like. Also, a plating layer of Ti, Ag, Pd, Au or the like may be provided on the surface of the leads  101  to  107 . The present embodiment will be described taking the case where the leads  101  to  107  are made of Cu as an example. The leads  101  to  107  are not particularly limited in thickness, and have, for example, a thickness of 50 μm to 500 μm, and preferably 100 μm to 150 μm. 
     The leads  101  to  107  each have an opposing part  110  and a terminal part  120 . The opposing part  110  overlaps with the semiconductor element  300  in plan view, and opposes a functional surface side electrode  330  of the semiconductor element  300  which will be discussed later. The terminal part  120  is exposed from the sealing resin  400  and is used for mounting the semiconductor device A 2  to a circuit board or the like. As shown in  FIGS. 17 and 19 , the leads  101  to  107  have a bent part between the opposing part  110  and the terminal part  120 . Also, the lead  101  has two terminal parts  120 . 
     As shown in  FIG. 19 , the opposing parts  110  have a joining surface  113  and a back surface  114 . The joining surface  113  faces the functional surface side electrode  330  of the semiconductor element  300 . In the present embodiment, a conduction supporting member side raised part  111  is formed on the joining surface  113  of the opposing part  110 . The conduction supporting member side raised part  111  projects toward the functional surface side electrode  330  from the joining surface  113 . The conduction supporting member side raised part  111  is not particularly limited in shape, and, in the present embodiment, the conduction supporting member side raised part  111  has a columnar shape. The conduction supporting member side raised part  111  has a height of 25 μm to 200 μm and a diameter of 10 μm to 500 μm. Such a conduction supporting member side raised part  111  can be formed by etching, for example. The back surface  114  faces in the opposite direction to the joining surface  113 . As shown in  FIGS. 16 and 20 , the back surface  114  of the opposing part  110  has unevenness. This uneven portion has a depth of about 20 μm, for example. 
     In the present embodiment, as shown in  FIG. 15 , the terminal parts  120  of the leads  101 ,  104  and  106  project to the left in the diagram. Also, the terminal parts  120  of the leads  102 ,  103 ,  105  and  107  project to the right in the diagram. The opposing part  110  of the lead  101  is comparatively large. The opposing parts  110  of the leads  102  and  103  are smaller than the opposing part  110  of the lead  101 , and are aligned in the y direction. The opposing part  110  of the lead  101  is aligned in the x direction with the opposing parts  110  of the leads  102  and  103 . The opposing parts  110  of the leads  104 ,  105 ,  106  and  107  are comparatively small. The opposing parts  110  of the leads  106  and  107  are disposed so as to be aligned in the x direction toward the center in the x direction. The opposing parts  110  of the leads  104  and  105  are disposed on either side in the x direction with the opposing parts  110  of the leads  106  and  107  sandwiched therebetween. 
     The semiconductor element  300  is an element that exhibits the functions of the semiconductor device A 2  and is not particularly limited in type, with it being possible to select from various types of elements such as a transistor, a diode or an LSI. As shown in  FIG. 19 , the semiconductor element  300  has a functional surface  310  and a back surface  320 . The back surface  320  has formed thereon a functional circuit (not shown) that realizes the functions of the semiconductor element  300 . The back surface  320  faces in the opposite direction to the functional surface  310 . The semiconductor element  300  is manufactured from a wafer made of Si or the like, for example. 
     The semiconductor element  300  has a plurality of functional surface side electrodes  330 , a passivation film  340 , and a protective film  350 . 
     The plurality of functional surface side electrodes  330  are formed on the functional surface  310  and are each electrically connected to a different one of the leads  101  to  107 . In the present embodiment, seven functional surface side electrodes  330  are formed in correspondence with the leads  101  to  107 . These functional surface side electrodes  330  have a common basic configuration despite differing in size and disposition. 
     In the present embodiment, as shown in  FIG. 15 , the functional surface side electrode  330  that opposes the opposing part  110  of the lead  101  is comparatively large, and has an oblong shape in plan view with the longitudinal direction being in the y direction. The two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  102  and  103  have a substantially square shape in plan view and are aligned in the y direction. The functional surface side electrode  330  that opposes the opposing part  110  of the lead  101  is aligned in the x direction with the two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  102  and  103 . The four functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  104 ,  105 ,  106  and  107  are comparatively small and have a substantially square shape in plan view. The two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  106  and  107  are disposed so as to be aligned in the x direction toward the center in the x direction. The two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  104  and  105  are disposed on either side in the x direction with the opposing parts  110  of the leads  106  and  107  sandwiched therebetween. 
     As shown in  FIGS. 15, 19 and 20 , the functional surface side electrodes  330  have a base layer  331 , a foundation layer  332 , a redistribution layer  333 , and a joining promotion layer  335 . 
     The base layer  331  contacts the functional surface  310 , and is electrically connected directly to an appropriate place of the functional circuit on the functional surface  310 . The functional surface  310  is made of Al, for example. The base layer  331  has a thickness of 0.1 μm to 10 μm, for example. 
     Here, the passivation film  340  and the protective film  350  will be described. The passivation film  340  is for preventing an excessive force from being loaded on the Si which is a main constituent of the semiconductor element  300 , and is made of an insulating material such as SiN, for example. The passivation film  340  has a thickness of 200 nm to 3 μm, for example. The protective film  350  is laminated on the passivation film  340 , and is for preventing an excessive force from being loaded on the Si which is a main constituent of the semiconductor element  300  and for facilitating formation of the redistribution layer  333 . The protective film  350  is made of an insulating material such as polyimide, for example. The protective film  350  has a thickness of about 5 μm, for example. 
     A through hole  341  is formed in the passivation film  340 . The through hole  341  is provided in order to expose the base layer  331  of the functional surface side electrode  330 . In the present embodiment, the portion of the passivation film  340  surrounding the through hole  341  covers an end edge of the base layer  331 . A through hole  351  is formed in the protective film  350 . The through hole  351  coincides with the through hole  341  in plan view, and is provided in order to expose the base layer  331  of the functional surface side electrode  330 . 
     Description will now return to the functional surface side electrodes  330 . The foundation layer  332  provides a foundation for forming the redistribution layer  333 . The foundation layer  332  coincides in shape with the functional surface side electrode  330  in plan view. That is, the foundation layer  332  covers the portion of the base layer  331  exposed from the passivation film  340  and the protective film  350 , the through hole  341  in the passivation film  340 , the through hole  351  in the protective film  350 , and an appropriate region of the protective film  350 . The foundation layer  332  is made of Ti, TiW, Ta or the like, for example. The foundation layer  332  has a thickness of about 100 nm. 
     The redistribution layer  333  is a main constituent of the functional surface side electrode  330 , and is larger than the base layer  331  in plan view. The redistribution layer  333  is not particularly limited in material, and is made of Cu in the present embodiment. The redistribution layer  333  has a thickness of about 10 μm, for example. 
     Note that, in plan view, the conduction supporting member side raised part  111  is disposed in a position that avoids the base layer  331  so as to not overlap with the base layer  331 . Also, the conduction supporting member side raised part  111  overlaps with the passivation film  340  and the protective film  350  in plan view. 
     Also, in the present embodiment, as shown in  FIG. 15 , a plurality of conduction supporting member side raised parts  111  are formed on the opposing parts  110  of the leads  101 ,  102  and  103 . Eight conduction supporting member side raised parts  111  are formed in four rows and two columns on the opposing part  110  of the lead  101 . Four conduction supporting member side raised parts  111  are formed in two rows and two columns on the opposing parts  110  of the leads  102  and  103 . One conduction supporting member side raised part  111  each is formed on the opposing parts  110  of the leads  104  to  107 . 
     The joining promotion layer  335  constitutes the uppermost layer of the functional surface side electrode  330 , and, in the present embodiment, covers the redistribution layer  333 . The joining promotion layer  335  is for strengthening the junction between the functional surface side electrodes  330  and conduction supporting member side raised parts  111  of the opposing parts  110  of the leads  101  to  107 . The joining promotion layer  335  contains at least one of Ni and Pd, and, in the present embodiment, consists of a Ni layer that directly covers the redistribution layer  333  and a Pd layer laminated on this Ni layer. The joining promotion layer  335  has a thickness of about 100 nm to 10 μm, for example. Also, apart from the materials given above, Cu, Al, Ti, Au or the like can be employed as appropriate as the material of the joining promotion layer  335 . 
     The functional surface side electrodes  330  are joined to the opposing parts  110  of the leads  101  to  107  by solid state bonding. More specifically, the redistribution layer  333  of the functional surface side electrodes  330  is solid state bonded to the conduction supporting member side raised parts ill of the opposing parts  110 . Note that, in the present embodiment, a configuration is adopted in which the joining promotion layer  335  is interposed between the redistribution layer  333  and the conduction supporting member side raised parts  111  of the opposing parts  110 . Note that a joining promotion layer may be formed on the conduction supporting member side raised parts  111  of the opposing parts  110 , in addition to or instead of forming the joining promotion layer  335  on the functional surface side electrodes  330 . 
     The sealing resin  400  entirely covers the semiconductor element  300  and covers the leads  101  to  107  except for the terminal parts  120 . The sealing resin  400  is made of an insulating material, and, in the present embodiment, is made of a black epoxy resin, for example. In the present embodiment, the sealing resin  400  is also filled between the joining surfaces  113  of the opposing parts  110  and the joining promotion layers  335  of the functional surface side electrodes  330 , in an area avoiding the conduction supporting member side raised parts  111 . 
     According to the present embodiment, the functional surface side electrodes  330  are joined to the conduction supporting member side raised parts  111  of the opposing parts  110  of the leads  101  to  107  by solid state bonding. Solid state bonding involves both sides being directly joined to each other and does not require a joining medium interposed between both sides, such as wire or solder. Also, the solid state bonding of all of the functional surface side electrodes  330  and the conduction supporting member side raised parts  111  of the opposing parts  110  of the leads  101  to  107  can be performed collectively. The manufacturing efficiency of the semiconductor device A 2  can thereby be improved. Also, the joining strength of the functional surface side electrodes  330  with the opposing parts  110  of the leads  101  to  107  can be enhanced. 
     As a result of providing the conduction supporting member side raised parts  111 , it is possible to reduce the area of the junction between the functional surface side electrodes  330  and the opposing parts  110  of the leads  101  to  107 . The force that needs to be applied in order to obtain a predetermined joining pressure at the time of solid state bonding can thereby be reduced. The semiconductor element  300  can thereby be prevented from being unintentionally damaged or the like. Also, as a result of providing the conduction supporting member side raised parts  111 , the sealing resin  400  can be reliably filled between the functional surface  310  of the semiconductor element  300  and the joining surfaces  113  of the opposing parts  110  of the leads  101  to  107 . Places that need to be insulated in the semiconductor device A 2  can thereby be more reliably insulated. 
     As a result of the conduction supporting member side raised parts  111  not overlapping with the base layer  331  in plan view, it is possible to avoid the force at the time of solid state bonding being excessively loaded on the Si forming a main constituent of the semiconductor element  300 . Also, as a result of the conduction supporting member side raised parts  111  being overlapped with the passivation film  340  and the protective film  350  in plan view, the force at the time of solid state bonding can be absorbed by the passivation film  340  and the protective film  350 . 
     As a result of providing the joining promotion layer  335 , solid state bonding of the functional surface side raised parts  334  to the opposing parts  110  can be performed more reliably. 
       FIGS. 25 to 30  show a semiconductor device that is based on a third embodiment of the present invention. A semiconductor device A 3  of the present embodiment is provided with leads  101  to  107 , a heat dissipation member  200 , a semiconductor element  300 , and a sealing resin  400 . 
       FIG. 25  is a plan view showing the semiconductor device A 3 .  FIG. 26  is a bottom view showing the semiconductor device A 3 .  FIG. 27  is a front view showing the semiconductor device A 3 .  FIG. 28  is a side view showing the semiconductor device A 3 .  FIG. 29  is a cross-sectional view along a line XXIX-XXIX in  FIG. 25 .  FIG. 30  is an enlarged cross-sectional view showing a main section of the semiconductor device A 3 . 
     The leads  101  to  107  are examples of a conduction supporting member as referred to in the present invention. The leads  101  to  107  constitute conduction paths between the semiconductor element  300  and outside the semiconductor device A 3 , and support the semiconductor element  300 . The leads  101  to  107  are made of a metal, and are preferably made of either Cu or Ni, an alloy thereof, alloy 42, or the like. Also, a plating layer of Ti, Ag, Pd, Au or the like may be provided on the surface of the leads  101  to  107 . The present embodiment will be described taking the case where the leads  101  to  107  are made of Cu as an example. The leads  101  to  107  are not particularly limited in thickness, and have, for example, a thickness of 50 μm to 500 μm, and preferably 100 μm to 150 μm. 
     The leads  101  to  107  each have an opposing part  110  and a terminal part  120 . The opposing part  110  overlaps with the semiconductor element  300  in plan view, and opposes a functional surface side electrode  330  of the semiconductor element  300  which will be discussed later. The terminal part  120  is exposed from the sealing resin  400  and is used for mounting the semiconductor device A 3  to a circuit board or the like. As shown in  FIGS. 27 and 29 , the leads  101  to  107  have a bent part between the opposing part  110  and the terminal part  120 . Also, the lead  101  has two terminal parts  120 . 
     As shown in  FIG. 29 , the opposing parts  110  have a joining surface  113  and a back surface  114 . The joining surfaces  113  face the functional surface side electrodes  330  of the semiconductor element  300 , and are joined to the functional surface side electrodes  330 . The back surfaces  114  face in the opposite direction to the joining surfaces  113 . 
     As shown in  FIGS. 26 and 30 , the back surface  114  of the opposing part  110  has unevenness. This uneven portion has a depth of about 20 μm, for example. 
     In the present embodiment, as shown in  FIG. 25 , the terminal parts  120  of the leads  101 ,  104  and  106  project to the left in the diagram. Also, the terminal parts  120  of the leads  102 ,  103 ,  105  and  107  project to the right in the diagram. The opposing part  110  of the lead  101  is comparatively large. The opposing parts  110  of the leads  102  and  103  are smaller than the opposing part  110  of the lead  101 , and are aligned in the y direction. The opposing part  110  of the lead  101  is aligned in the x direction with the opposing parts  110  of the leads  102  and  103 . The opposing parts  110  of the leads  104 ,  105 ,  106  and  107  are comparatively small. The opposing parts  110  of the leads  106  and  107  are disposed so as to be aligned in the x direction toward the center in the x direction. The opposing parts  110  of the leads  104  and  105  are disposed on either side in the x direction with the opposing parts  110  of the leads  106  and  107  sandwiched therebetween. 
     The heat dissipation member  200  is joined to the semiconductor element  300  and is for promoting dissipation of heat from the semiconductor element  300 . The heat dissipation member  200  is made of a metal, and is preferably made of either Cu or Ni, an alloy thereof, alloy 42, or the like. Also, a plating layer of Ti, Ag, Pd, Au or the like may be provided on the surface of the heat dissipation member  200 . The heat dissipation member  200  is not particularly limited in thickness, and has, for example, a thickness of 50 μm to 500 μm, and preferably 100 μm to 150 μm. The present embodiment will be described taking the case where the heat dissipation member  200  is made of Cu and is formed together with the leads  101  to  107  as an example. In this case, in the manufacturing process of the semiconductor device A 3 , the leads  101  to  107  and the heat dissipation member  200  are formed from the same plate-like member. Also, in order to realize a disposition in which the leads  101  to  107  face the heat dissipation member  200  with the semiconductor element  300  sandwiched therebetween, a technique in which the leads  101  to  107  are rotated 180 degrees relative to the heat dissipation member  200  about a rotation axis extending along the y axis can be employed. 
     As shown in  FIGS. 29 and 30 , the heat dissipation member  200  has a joining surface  210  and a back surface  220 . The joining surface  210  is joined to the semiconductor element  300 . The back surface  220  faces in the opposite direction to the joining surface  210 . In the present embodiment, the back surface  220  is exposed from the sealing resin  400 . Also, as shown in  FIGS. 25 and 30 , the back surface  220  has unevenness. This uneven portion has a depth of about 20 μm, for example. 
     The semiconductor element  300  is an element that exhibits the functions of the semiconductor device A 3  and is not particularly limited in type, with it being possible to select from various types of elements such as a transistor, a diode or an LSI. As shown in  FIG. 29 , the semiconductor element  300  has a functional surface  310  and a back surface  320 . The back surface  320  has formed thereon a functional circuit (not shown) that realizes the functions of the semiconductor element  300 . The back surface  320  faces in the opposite direction to the functional surface  310 . The semiconductor element  300  is manufactured from a wafer made of Si or the like, for example. 
     The semiconductor element  300  has a plurality of functional surface side electrodes  330 , a passivation film  340 , a protective film  350 , a back surface metal layer  360 , and a joining promotion layer  361 . 
     The plurality of functional surface side electrodes  330  are formed on the functional surface  310  and are each electrically connected to a different one of the leads  101  to  107 . In the present embodiment, seven functional surface side electrodes  330  are formed in correspondence with the leads  101  to  107 . These functional surface side electrodes  330  have a common basic configuration despite differing in size and disposition. 
     In the present embodiment, as shown in  FIG. 25 , the functional surface side electrode  330  that opposes the opposing part  110  of the lead  101  is comparatively large, and has an oblong shape in plan view with the longitudinal direction being in the y direction. The two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  102  and  103  have a substantially square shape in plan view and are aligned in the y direction. The functional surface side electrode  330  that opposes the opposing part  110  of the lead  101  is aligned in the x direction with the two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  102  and  103 . The four functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  104 ,  105 ,  106  and  107  are comparatively small and have a substantially square shape in plan view. The two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  106  and  107  are disposed so as to be aligned in the x direction toward the center in the x direction. The two functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  104  and  105  are disposed on either side in the x direction with the opposing parts  110  of the leads  106  and  107  sandwiched therebetween. 
     As shown in  FIGS. 25, 29 and 30 , the functional surface side electrodes  330  have a base layer  331 , a foundation layer  332 , a redistribution layer  333 , a functional surface side raised part  334 , and a joining promotion layer  335 . 
     The base layer  331  contacts the functional surface  310 , and is electrically connected directly to an appropriate place of the functional circuit on the functional surface  310 . The functional surface  310  is made of Al, for example. The base layer  331  has a thickness of 0.1 μm to 10 μm, for example. 
     Here, the passivation film  340  and the protective film  350  will be described. The passivation film  340  is for preventing an excessive force from being loaded on the Si which is a main constituent of the semiconductor element  300 , and is made of an insulating material such as SiN, for example. The passivation film  340  has a thickness of 200 nm to 3 μm, for example. The protective film  350  is laminated on the passivation film  340 , and is for preventing an excessive force from being loaded on the Si which is a main constituent of the semiconductor element  300  and for facilitating formation of the redistribution layer  333 . The protective film  350  is made of an insulating material such as polyimide, for example. The protective film  350  has a thickness of about 5 μm, for example. 
     A through hole  341  is formed in the passivation film  340 . The through hole  341  is provided in order to expose the base layer  331  of the functional surface side electrode  330 . In the present embodiment, the portion of the passivation film  340  surrounding the through hole  341  covers an end edge of the base layer  331 . A through hole  351  is formed in the protective film  350 . The through hole  351  coincides with the through hole  341  in plan view, and is provided in order to expose the base layer  331  of the functional surface side electrode  330 . 
     Description will now return to the functional surface side electrodes  330 . The foundation layer  332  provides a foundation for forming the redistribution layer  333 . The foundation layer  332  coincides in shape with the functional surface side electrode  330  in plan view. That is, the foundation layer  332  covers the portion of the base layer  331  exposed from the passivation film  340  and the protective film  350 , the through hole  341  in the passivation film  340 , the through hole  351  in the protective film  350 , and an appropriate region of the protective film  350 . The foundation layer  332  is made of Ti, TiW, Ta or the like, for example. The foundation layer  332  has a thickness of about 100 nm. 
     The redistribution layer  333  is a main constituent of the functional surface side electrode  330 , and is larger than the base layer  331  in plan view. The redistribution layer  333  is not particularly limited in material, and is made of Cu in the present embodiment. The redistribution layer  333  has a thickness of about 10 μm, for example. 
     The functional surface side raised part  334  is formed on the redistribution layer  333  and projects in the direction in which the functional surface  310  faces. The functional surface side raised part  334  is not particularly limited in material as long as the material is a conductive material, and is made of Cu in the present embodiment. Also, the functional surface side raised part  334  is not particularly limited in shape, and has a columnar shape in the present embodiment. The functional surface side raised part  334  has a diameter of 25 μm to 200 μm and a height of 10 μm to 500 μm. In plan view, the functional surface side raised part  334  is disposed in a position that avoids the base layer  331  so as to not overlap with the base layer  331 . Also, the functional surface side raised part  334  overlaps with the passivation film  340  and the protective film  350  in plan view. 
     Also, in the present embodiment, as shown in  FIG. 25 , a plurality of functional surface side raised parts  334  are formed on the three functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  101 ,  102  and  103 . Eight functional surface side raised parts  334  are formed in four rows and two columns on the functional surface side raised part  334  that opposes the opposing part  110  of the lead  101 . Four functional surface side raised parts  334  are formed in two rows and two columns on the functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  102  and  103 . One functional surface side raised part  334  each is formed on the functional surface side electrodes  330  that oppose the opposing parts  110  of the leads  104  to  107 . 
     The joining promotion layer  335  constitutes the uppermost layer of the functional surface side electrode  330 , and, in the present embodiment, covers the functional surface side raised parts  334  and the redistribution layer  333 . The joining promotion layer  335  is for strengthening the junction between the functional surface side electrodes  330  and the opposing parts  110  of the leads  101  to  107 . The joining promotion layer  335  contains at least one of Ni and Pd, and, in the present embodiment, consists of a Ni layer that directly covers the functional surface side raised parts  334  and the redistribution layer  333  and a Pd layer laminated on this Ni layer. The joining promotion layer  335  has a thickness of about 100 nm to 10 μm, for example. Also, apart from the materials given above, Cu, Al, Ti, Au or the like can be employed as appropriate as the material of the joining promotion layer  335 . 
     The functional surface side electrodes  330  are joined to the opposing parts  110  of the leads  101  to  107  by solid state bonding. More specifically, the top faces of the functional surface side raised parts  334  are solid state bonded to the joining surfaces  113  of the opposing parts  110 . Note that, in the present embodiment, a configuration is adopted in which the joining promotion layer  335  is interposed between the functional surface side raised parts  334  and the joining surfaces  113  of the opposing parts  110 . Note that a joining promotion layer may be formed on the joining surfaces  113  of the opposing parts  110 , in addition to or instead of forming the joining promotion layer  335  on the functional surface side electrodes  330 . 
     The back surface metal layer  360  is formed on the back surface  320 , and, in the present embodiment, entirely covers the surface of the back surface  320 . The back surface metal layer  360  is made of a metal, and is made of Cu, Al, Ti, Au, or the like. The back surface metal layer  360  has a thickness of 0.1 μm to 10 μm, for example. 
     The joining promotion layer  361  is laminated on the back surface metal layer  360 . The joining promotion layer  361  contains at least one of Ni and Pd, and, in the present embodiment, consists of a Ni layer that directly covers the back surface  320  and a Pd layer laminated on this Ni layer. The joining promotion layer  361  has a thickness of about 100 nm to 10 μm, for example. Also, apart from the materials given above, Cu, Al, Ti, Au or the like can be employed as appropriate as the material of the joining promotion layer  361 . 
     The back surface metal layer  360  is joined to the joining surface  210  of the heat dissipation member  200  by solid state bonding. In the present embodiment, the joining promotion layer  361  is configured to be interposed between the back surface metal layer  360  and the joining surface  210 . The back surface  220  of the heat dissipation member  200  has unevenness as described above due to the marks left by a jig being pressed thereagainst at the time of solid state bonding the back surface metal layer  360  to the heat dissipation member  200 . 
     The sealing resin  400  entirely covers the semiconductor element  300  and covers the leads  101  to  107  except for the terminal parts  120 . The sealing resin  400  is made of an insulating material, and, in the present embodiment, is made of a black epoxy resin, for example. In the present embodiment, the sealing resin  400  is also filled between the joining surfaces  113  of the opposing parts  110  and the joining promotion layers  335  of the functional surface side electrodes  330 , in areas avoiding the functional surface side raised parts  334 . 
     According to the present embodiment, the heat dissipation member  200  is solid state bonded to the back surface  320  of the semiconductor element  300 . An increase in the joining efficiency of the heat dissipation member  200  with the back surface  320  of the semiconductor element  300  can thereby be achieved, compared with the case where joining is performed via a joining material, for example. Also, as a result of performing solid state bonding, the efficiency with which heat is transferred from the semiconductor element  300  to the heat dissipation member  200  can be enhanced, and the dissipation of heat from the semiconductor element  300  can be promoted. 
     The functional surface side raised parts  334  are joined to the opposing parts  110  of the leads  101  to  107  by solid state bonding. Solid state bonding involves both sides being directly joined to each other and does not require a joining medium interposed between both sides, such as wire or solder. Also, the solid state bonding of all of the functional surface side raised parts  334  and the opposing parts  110  of the leads  101  to  107  can be performed collectively. The manufacturing efficiency of the semiconductor device A 3  can thereby be improved. Also, the joining strength of the functional surface side raised parts  334  with the opposing parts  110  of the leads  101  to  107  can be enhanced. 
     As a result of providing the functional surface side raised parts  334 , it is possible to reduce the area of the junction between the functional surface side electrodes  330  and the opposing parts  110  of the leads  101  to  107 . The force that needs to be applied in order to obtain a predetermined joining pressure at the time of solid state bonding can thereby be reduced. The semiconductor element  300  can thereby be prevented from being unintentionally damaged or the like. Also, as a result of providing the functional surface side raised parts  334 , the sealing resin  400  can be reliably filled between the functional surface  310  of the semiconductor element  300  and the joining surfaces  113  of the opposing parts  110  of the leads  101  to  107 . Places that need to be insulated in the semiconductor device A 3  can thereby be more reliably insulated. 
     As a result of the functional surface side raised parts  334  not overlapping with the base layer  331  in plan view, it is possible to avoid the force at the time of solid state bonding being excessively loaded on the Si forming a main constituent of the semiconductor element  300 . Also, as a result of the functional surface side raised parts  334  being overlapped with the passivation film  340  and the protective film  350  in plan view, the force at the time of solid state bonding can be absorbed by the passivation film  340  and the protective film  350 . 
     As a result of providing the joining promotion layer  335 , solid state bonding of the functional surface side raised parts  334  to the opposing parts  110  can be performed more reliably. 
       FIG. 31  shows the modification of the semiconductor device A 3 . In the present modification, the conduction supporting member side raised parts  111  described in relation to the semiconductor device A 2  are formed on the opposing parts  110 , instead of forming the functional surface side raised parts  334 . An increase in the joining efficiency of the heat dissipation member  200  with the back surface  320  of the semiconductor element  300  can also be achieved according to such a modification. Also, dissipation of heat from the semiconductor element  300  can be promoted. Also, the semiconductor device A 3  may be the configuration to have both the functional surface side raised parts  334  and the conduction supporting member side raised parts  111 . 
     The semiconductor device according to the present invention is not limited to the abovementioned embodiments. Design changes can be freely made to the specific configurations of the various parts of the semiconductor device according to the present invention. 
     Configurations of the present invention and variations thereof are enumerated below as appendixes. 
     [Appendix 1A] 
     A semiconductor device comprising: 
     a semiconductor element having a functional surface on which a functional circuit is formed and a back surface facing in an opposite direction to the functional surface; 
     a conduction supporting member supporting the semiconductor element and electrically connected to the semiconductor element; and 
     a resin package at least partially covering the semiconductor element and the conduction supporting member, 
     wherein the semiconductor element has a functional surface side electrode formed on the functional surface, 
     the conduction supporting member has a conduction supporting member side raised part that projects toward the functional surface side electrode, and 
     the functional surface side electrode is joined to the conduction supporting member side raised part of the conduction supporting member by solid state bonding. 
     [Appendix 2A] 
     The semiconductor device according to appendix 1A, wherein the functional surface side electrode has a base layer that contacts the functional surface. 
     [Appendix 3A] 
     The semiconductor device according to appendix 2A, wherein the base layer is made of Al. 
     [Appendix 4A] 
     The semiconductor device according to appendix 2A, wherein the conduction supporting member side raised part and the base layer do not overlap with each other in plan view. 
     [Appendix 5A] 
     The semiconductor device according to appendix 2A, wherein the functional surface side electrode has a foundation layer laminated on the base layer. 
     [Appendix 6A] 
     The semiconductor device according to appendix 5A, wherein the foundation layer is made of one of Ti, W and Ta. 
     [Appendix 7A] 
     The semiconductor device according to appendix 5A, wherein the functional surface side electrode has a redistribution layer laminated on the foundation layer. 
     [Appendix 8A] 
     The semiconductor device according to appendix 7A, wherein the redistribution layer is made of Cu. 
     [Appendix 9A] 
     The semiconductor device according to appendix 7A, wherein the redistribution layer is larger than the base layer in plan view. 
     [Appendix 10A] 
     The semiconductor element according to any of appendix 7A, wherein the functional surface side electrode has a joining promotion layer that is positioned as an uppermost layer. 
     [Appendix 11A] 
     The semiconductor device according to appendix 10A, wherein the joining promotion layer of the functional surface side electrode is made of at least one of Ni and Pd. 
     [Appendix 12A] 
     The semiconductor device according to appendix 10A, wherein the joining promotion layer of the functional surface side electrode has a Ni layer that is positioned on the functional surface side and a Pd layer laminated on the Ni layer. 
     [Appendix 13A] 
     The semiconductor element according to appendix 7A, comprising a passivation film covering the functional surface and having formed therein a through hole that allows the functional surface side electrode to reach the functional surface. 
     [Appendix 14A] 
     The semiconductor device according to appendix 13A, wherein the passivation film is made of SiN. 
     [Appendix 15A] 
     The semiconductor device according to appendix 13A, wherein the redistribution layer overlaps with the passivation film in plan view. 
     [Appendix 16A] 
     The semiconductor device according to appendix 13A, wherein the conduction supporting member side raised part overlaps with the passivation film in plan view. 
     [Appendix 17A] 
     The semiconductor element according to appendix 13A, comprising a protective film laminated on the passivation film. 
     [Appendix 18A] 
     The semiconductor device according to appendix 17A, wherein the protective film is made of polyimide. 
     [Appendix 19A] 
     The semiconductor device according to appendix 17A, wherein the redistribution layer overlaps with the protective film in plan view. 
     [Appendix 20A] 
     The semiconductor device according to appendix 17A, wherein the conduction supporting member side raised part overlaps with the protective film in plan view. 
     [Appendix 21A] 
     The semiconductor device according to appendix 1A, wherein the conduction supporting member is a lead made of a metal. 
     [Appendix 22A] 
     The semiconductor element according to appendix 21A, wherein a portion of the lead projects from the resin package. 
     [Appendix 23A] 
     The semiconductor device according to appendix 21A, wherein a surface of the lead on an opposite side to a region where the lead is joined to the functional surface side electrode has unevenness. 
     [Appendix 24A] 
     The semiconductor device according to appendix 21A, wherein the conduction supporting member side raised part is constituted by a portion that is thicker than a surrounding portion. 
     [Appendix 25A] 
     The semiconductor device according to appendix 24A, wherein the conduction supporting member side raised part has a through hole formed therein. 
     [Appendix 26A] 
     The semiconductor device according to appendix 21A, wherein the conduction supporting member side raised part is formed from a bent portion of the conduction supporting member. 
     [Appendix 27A] 
     The semiconductor device according to appendix 1A, wherein the semiconductor element has a plurality of the functional surface side electrode. 
     [Appendix 28A] 
     The semiconductor device according to appendix 1A, wherein the functional surface side electrode is joined to the plurality of conduction supporting member side raised parts. 
     [Appendix 29A] 
     The semiconductor device according to appendix 1A, further comprising a heat dissipation member joined to the semiconductor element, 
     wherein the semiconductor element has a back surface metal layer formed on the back surface, and 
     the back surface metal layer of the semiconductor element is joined to the heat dissipation member by solid state bonding. 
     [Appendix 30A] 
     The semiconductor device according to appendix 29A, wherein a joining promotion layer is laminated on the back surface metal layer. 
     [Appendix 31A] 
     The semiconductor device according to appendix 30A, wherein the joining promotion layer on the back surface metal layer is made of at least one of Ni and Pd. 
     [Appendix 32A] 
     The semiconductor device according to appendix 29A, wherein a joining promotion layer is laminated on the heat dissipation member. 
     [Appendix 33A] 
     The semiconductor device according to appendix 32A, wherein the joining promotion layer on the heat dissipation member is made of at least one of Ni and Pd. 
     [Appendix 34A] 
     The semiconductor device according to appendix 29A, wherein a surface of the heat dissipation member on an opposite side to a region where the heat dissipation member is joined to the back surface metal layer has unevenness. 
     [Appendix 35A] 
     The semiconductor device according to appendix 29A, wherein a surface of the heat dissipation member on an opposite side to a region where the heat dissipation member is joined to the back surface metal layer is exposed from the resin package. 
     [Appendix 1B] 
     A semiconductor device comprising: 
     a semiconductor element having a functional surface on which a functional circuit is formed and a back surface facing in an opposite direction to the functional surface; 
     a conduction supporting member supporting the semiconductor element and electrically connected to the semiconductor element; 
     a heat dissipation member joined to the semiconductor element; and 
     a resin package at least partially covering the semiconductor element, the conduction supporting member and the heat dissipation member, 
     wherein the semiconductor element has a back surface metal layer formed on the back surface, and 
     the back surface metal layer of the semiconductor element is joined to the heat dissipation member by solid state bonding. 
     [Appendix 2B] 
     The semiconductor device according to appendix 1B, wherein a joining promotion layer is laminated on the back surface metal layer. 
     [Appendix 3B] 
     The semiconductor device according to appendix 2B, wherein the joining promotion layer on the back surface metal layer is made of at least one of Ni and Pd. 
     [Appendix 4B] 
     The semiconductor device according to appendix 1B, wherein a joining promotion layer is laminated on the heat dissipation member. 
     [Appendix 5B] 
     The semiconductor device according to appendix 4B, wherein the joining promotion layer on the heat dissipation member is made of at least one of Ni and Pd. 
     [Appendix 6B] 
     The semiconductor device according to appendix 1B, wherein a surface of the heat dissipation member on an opposite side to a region where the heat dissipation member is joined to the back surface metal layer has unevenness. 
     [Appendix 7B] 
     The semiconductor device according to appendix 1B, wherein the semiconductor element has a functional surface side electrode formed on the functional surface. 
     [Appendix 8B] 
     The semiconductor device according to appendix 7B, wherein the functional surface side electrode is equipped with a functional surface side raised part that projects in a direction in which the functional surface faces, and 
     the functional surface side raised part of the functional surface side electrode is joined to the conduction supporting member by solid state bonding. 
     [Appendix 9B] 
     The semiconductor device according to appendix 7B, wherein the conduction supporting member has a conduction supporting member side raised part that projects toward the functional surface side electrode, and 
     the functional surface side electrode is joined to the conduction supporting member side raised part of the conduction supporting member by solid state bonding. 
     [Appendix 10B] 
     The semiconductor device according to appendix 7B, wherein the functional surface side electrode has a base layer that contacts the functional surface. 
     [Appendix 11B] 
     The semiconductor device according to appendix 10B, wherein the base layer is made of Al. 
     [Appendix 12B] 
     The semiconductor device according to appendix 10B, wherein the functional surface side electrode has a foundation layer laminated on the base layer. 
     [Appendix 13B] 
     The semiconductor device according to appendix 12B, wherein the foundation layer is made of one of Ti, W and Ta. 
     [Appendix 14B] 
     The semiconductor device according to appendix 12B, wherein the functional surface side electrode has a redistribution layer laminated on the foundation layer. 
     [Appendix 15B] 
     The semiconductor device according to appendix 14B, wherein the redistribution layer is made of Cu. 
     [Appendix 16B] 
     The semiconductor device according to appendix 14B, wherein the redistribution layer is larger than the base layer in plan view. 
     [Appendix 17B] 
     The semiconductor device according to appendix 14B, wherein the functional surface side electrode has a joining promotion layer that is positioned as an uppermost layer. 
     [Appendix 18B] 
     The semiconductor device according to appendix 17B, wherein the joining promotion layer of the functional surface side electrode is made of at least one of Ni and Pd. 
     [Appendix 19B] 
     The semiconductor device according to appendix 14B comprising a passivation film covering the functional surface and having formed therein a through hole that allows the functional surface side electrode to reach the functional surface. 
     [Appendix 20B] 
     The semiconductor device according to appendix 19B, wherein the passivation film is made of SiN. 
     [Appendix 21B] 
     The semiconductor device according to appendix 19B, wherein the redistribution layer overlaps with the passivation film in plan view. 
     [Appendix 22B] 
     The semiconductor device according to appendix 19B, comprising a protective film laminated on the passivation film. 
     [Appendix 23B] 
     The semiconductor device according to appendix 22B, wherein the protective film is made of polyimide. 
     [Appendix 24B] 
     The semiconductor device according to appendix 22B, wherein the redistribution layer overlaps with the protective film in plan view. 
     [Appendix 25B] 
     The semiconductor device according to appendix 1B, wherein the conduction supporting member is a lead made of a metal. 
     [Appendix 26B] 
     The semiconductor device according to appendix 25B, wherein a portion of the lead projects from the resin package. 
     [Appendix 27B] 
     The semiconductor device according to appendix 25B, wherein a surface of the lead on an opposite side to a region where the lead is joined to the functional surface side electrode has unevenness.