Abstract:
A manufacturing method of a semiconductor device is disclosed. The manufacturing method includes a first step that mounts plural semiconductor elements on a first substrate, a second step that inspects each of the semiconductor elements mounted on the first substrate, a third step that divides the first substrate by dicing so that a divided first substrate includes at least one semiconductor element, and a fourth step that mounts the divided first substrate in which at least one semiconductor element is mounted on a second substrate.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention generally relates to a semiconductor device and a manufacturing method thereof in which a substrate on which a semiconductor element is mounted is further mounted on another substrate.  
         [0003]     2. Description of the Related Art  
         [0004]     There are various kinds of semiconductor devices on which a semiconductor element is mounted. For example, when the semiconductor element is an optical function element having a light emitting function or a photoelectric conversion function, the semiconductor device can be used as a displaying device, a communicating device, a measuring device, a controlling device, and so on. Such a semiconductor device is formed by mounting an optical function element on a predetermined substrate on which wirings are formed.  
         [0005]      FIGS. 1A through 1C  are schematic cross-sectional views showing processes for manufacturing a semiconductor device on which an LED (light emitting diode) is mounted.  
         [0006]     Referring to  FIGS. 1A through 1C , manufacturing processes of the semiconductor device are described.  
         [0007]     First, in a process shown in  FIG. 1A , a substrate  1  is prepared. The substrate  1  is made of, for example, a ceramic material, and a concave section  1 A is formed in the substrate  1 . A semiconductor element is mounted on the concave section  1 A in a later process. In addition, a wiring section  2 , which is to be connected to the semiconductor element to be mounted, is formed on the bottom surface of the concave section  1 A, and connecting layers (bumps)  3  made of Au are formed on the wiring section  2 .  
         [0008]     The side wall of the concave section  1 A is formed to have, for example, a taper-shaped surface and a reflection surface  4  is formed on the side wall surface.  
         [0009]     Next, in a process shown in  FIG. 1B , a semiconductor element  5  (for example, an LED) is mounted on the connecting layers  3 . In this case, the semiconductor element  5  is connected to the wiring section  2  via the connecting layers  3 .  
         [0010]     Next, in a process shown in  FIG. 1C , a fluorescent substance layer  6  is applied so as to cover the semiconductor element  5 . For example, an LED emits a predetermined color light; however, the kinds of colors are limited. Therefore, when a desired color light is obtained, in some cases, a mixed color is obtained by mixing a color light emitted from the LED with a color light emitted from the fluorescent substance. In this case, the color light to be emitted from the fluorescent substance is determined corresponding to the color light of the LED. Further, a coloring material can be mixed into the fluorescent substance.  
         [0011]     By the processes described above, a semiconductor device  10  in which the semiconductor element (LED)  5  is mounted on the substrate  1  is formed. In the above description, only one LED is used; however, the number of LEDs is not limited to one, and plural LEDs can be mounted on the substrate  1 .  
         [0012]     Related art cases are described in the following documents.  
         [0013]     [Patent Document 1] Japanese Laid-Open Patent Application No. 2003-163381 (U.S. Pat. No. 6,774,406)  
         [0014]     [Patent Document 2] Japanese Laid-Open Patent Application No. 2003-168828  
         [0015]     [Patent Document 3] Japanese Laid-Open Patent Application No. 2004-260169 (United States Patent Application Publication No. US2004/0166234)  
         [0016]     In the above documents, a technology in which an LED is coated by resin containing a fluorescent substance is disclosed. However, a semiconductor device in which a substrate on which an LED is mounted is further mounted on another substrate is not disclosed.  
         [0017]     In the above described semiconductor device, in some cases, a defective semiconductor device is manufactured caused by, for example, irregular color and poor light emission due to an individual difference of the LED which is mounted on the substrate.  
         [0018]     In addition, for example, when the thickness of the fluorescent substance layer  6  applied on the semiconductor element  5  is dispersed, irregular color occurs.  
         [0019]     Further, in a case where a light emitting state of each semiconductor element such as an LED is inspected before mounting on a substrate, excessive time and workload are needed; consequently, the inspection cannot be actually executed. In addition, it is difficult to find the poor light emission until the process shown in  FIG. 1C  is finished or at least the process shown in  FIG. 1B  is finished. Accordingly, when a defective semiconductor device is found after the semiconductor elements are mounted, the defective semiconductor device on which plural semiconductor elements are mounted must be discarded.  
       SUMMARY OF THE INVENTION  
       [0020]     It is a general object of the present invention to provide a semiconductor device and a manufacturing method thereof that are novel and useful so as to substantially obviate one or more of the problems caused by the limitations and disadvantages of the related art.  
         [0021]     Features and advantages of the present invention are set forth in the description which follows, and in part will become apparent from the description and the accompanying drawings, or may be learned by practice of the invention according to the teachings provided in the description. Features and advantages of the present invention may be realized and attained by a semiconductor device and a manufacturing method thereof particularly pointed out in the specification in such full, clear, concise, and exact terms as to enable a person having ordinary skill in the art to practice the invention.  
         [0022]     According to one aspect of the present invention, there is provided a manufacturing method of a semiconductor device. The manufacturing method includes a first step that mounts plural semiconductor elements on a first substrate, a second step that inspects each of the semiconductor elements mounted on the first substrate, a third step that divides the first substrate by dicing so that a divided first substrate includes at least one semiconductor element, and a fourth step that mounts the divided first substrate in which at least one semiconductor element is mounted on a second substrate.  
         [0023]     Since each of the plural semiconductor elements is inspected in the second step and inspected semiconductor elements are mounted on the second substrate in the fourth step, an individual difference among the plural semiconductor elements which are mounted on the second substrate is prevented and the yield in manufacturing the semiconductor device can be increased.  
         [0024]     When the semiconductor element is an optical function element, it is conventionally difficult to inspect the optical function element while the semiconductor device is being manufactured. However, the optical function element can be inspected when the optical function element is mounted on the first substrate; therefore, the yield in manufacturing the semiconductor device can be increased.  
         [0025]     In addition, when the first step includes a step of forming an optical function layer which operates for a transmission light on the semiconductor element, the dispersion of the coating of the optical function layers on the semiconductor element can be inspected. Consequently, the dispersion of the optical function layers in the semiconductor devices can be decreased.  
         [0026]     In addition, when the semiconductor element is an LED and the optical function layer is a fluorescent substance layer, a semiconductor device having a light emitting function can be manufactured at high productivity by combining the LED and the fluorescent substance layer.  
         [0027]     In addition, since the second step includes an inspection while the LED is emitting light, a defective LED can be rejected before mounting the LED on the second substrate.  
         [0028]     In addition, when the optical function layer is formed by an inkjet method, a defective optical function layer caused by non-uniform coating can be avoided.  
         [0029]     In addition, when wiring sections formed on the first substrate are connected to the semiconductor element via connecting sections by ultrasonic bonding, since solder is not used, contamination of the semiconductor element caused by flux of the solder can be prevented.  
         [0030]     In addition, when wiring sections formed in the first substrate are connected to a wiring section formed on the second substrate by solder, the certainty of the connection can be obtained.  
         [0031]     According to another aspect of the present invention, there is provided a semiconductor device. The semiconductor device includes a first substrate on which a semiconductor element is mounted and a second substrate on which the first substrate is mounted. The semiconductor element is an optical function element and an optical function layer which operates for a transmission light is formed on the optical function element.  
         [0032]     Since the semiconductor element mounted on the first substrate is inspected before being mounted on the second substrate, the dispersion of the characteristics of the semiconductor elements can be decreased. In addition, when the semiconductor element is mounted on the second substrate in a state where the semiconductor element has been mounted on the first substrate, the position and the angle of the semiconductor element on the second substrate can be determined at high accuracy.  
         [0033]     In addition, when the semiconductor element is an LED, the dispersion of light emission of the LED can be decreased and the position and the angle of the LED on the second substrate can be determined at high accuracy.  
         [0034]     In addition, when the optical function layer is a fluorescent substance layer, a desired color light can be obtained.  
         [0035]     In addition, when a concave section is formed in the second substrate so as to contain the first substrate on which the semiconductor element is mounted and a reflection surface is formed on the concave section, the light emitting efficiency can be increased.  
         [0036]     In addition, since wiring sections are formed to penetrate the first substrate and connect the semiconductor element to a wiring section formed on the second substrate, a thin semiconductor device can be obtained.  
         [0037]     In the second substrate so as to contain the first substrate on which the semiconductor element is mounted, a reflection surface is formed on the concave section and wiring sections are formed on the first substrate so as to connect to the semiconductor element via connecting layers, and the connecting sections are connected to a wiring section formed on the second substrate by wire bonding. Therefore, the certainty of the connection can be obtained.  
         [0038]     In addition, a concave section is formed in the first substrate so as to contain the semiconductor element, the concave section is filled with an optical function layer, wiring sections are formed to penetrate the first substrate so as to connect the semiconductor element to a second substrate via connecting sections, and the wiring sections are connected to a wiring section formed on the second substrate by solder; therefore the certainty of the connection can be obtained.  
         [0039]     In addition, a concave section is formed in the first substrate so as to contain the semiconductor element. The concave section is formed to have a taper shape, a reflection surface is formed on the taper-shaped surface of the concave section, an optical function layer is formed to cover the semiconductor element, wiring sections are formed to penetrate the first substrate so as to connect the semiconductor element to a second substrate via connecting sections, and the wiring sections are connected to a wiring section formed on the second substrate by solder; therefore the certainty of the connection can be obtained.  
         [0040]     In addition, since the first substrate is a silicon substrate, the transfer of heat can be excellent.  
         [0041]     According to embodiments of the present invention, a semiconductor device and a manufacturing method of the semiconductor device can be provided in which an individual difference of characteristics among semiconductor elements can be decreased and the yield in manufacturing the semiconductor device can be increased.  
         [0042]     Features and advantages of the present invention will become apparent from the following detailed description when read in conjunction with the accompanying drawings. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0043]      FIGS. 1A through 1C  are schematic cross-sectional views showing processes for manufacturing a semiconductor device on which an LED is mounted;  
         [0044]      FIGS. 2A through 2F  are schematic cross-sectional views showing processes in a manufacturing method of a semiconductor device according to a first embodiment of the present invention;  
         [0045]      FIG. 3  is a schematic cross-sectional view showing a semiconductor device according to a second embodiment of the present invention;  
         [0046]      FIG. 4  is a schematic cross-sectional view showing a modified example of the second embodiment shown in  FIG. 3 ;  
         [0047]      FIG. 5  is a schematic cross-sectional view showing a semiconductor device according to a third embodiment of the present invention; and  
         [0048]      FIG. 6  is a schematic cross-sectional view showing a semiconductor device according to a fourth embodiment of the present invention. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0049]     In the following, embodiments of the present invention are described with reference to the accompanying drawings.  
       First Embodiment  
       [0050]      FIGS. 2A through 2F  are schematic cross-sectional views showing processes in a manufacturing method of a semiconductor device according to a first embodiment of the present invention.  
         [0051]     Referring to  FIGS. 2A through 2F , the manufacturing method of the semiconductor device according to the first embodiment of the present invention is described.  
         [0052]     In the following description, the manufacturing method for one semiconductor device is mainly explained; however, the number of the semiconductor devices is not limited to one, and plural semiconductor devices are actually formed at the same time.  
         [0053]     First, in a process shown in  FIG. 2A , via holes BH are formed in a substrate  101  made of, for example, a silicon wafer, and an insulation layer  102  is formed on the surface of the substrate  101  and on the inner wall surface of the via holes BH. The insulation layer  102  can be formed by various methods. For example, a film of an organic material such as a resin material is formed by an electro-deposition method, or a film of an inorganic material such as SiO 2  or SiN is formed by a CVD (chemical vapor deposition) method or a sputtering method.  
         [0054]     Next, via plugs  103  are formed so as to fill the via holes BH and pattern wirings  104  and  105  are formed so as to connect to the via plugs  103  by, for example, a Cu plating method. For example, the via plugs  103  and the pattern wirings  104  and  105  are formed by Cu electrolytic plating; however, it is preferable that a Cu layer which is a seed layer be formed by electroless plating, a CVD method, or a sputtering method before applying the Cu electrolytic plating.  
         [0055]     The via plugs  103  are formed to penetrate the substrate  101 . The pattern wirings  104  are formed at the side where a semiconductor element is mounted of the substrate  101  at a later process (hereinafter this side is referred to as the first side). The pattern wirings  105  are formed at the side opposite to the first side of the substrate  101  (hereinafter this side is referred to as the second side).  
         [0056]     Next, connecting layers (bumps)  106  are formed on the pattern wirings  104  so that the pattern wirings  104  can be excellently electrically connected to the semiconductor element. The connecting layers  106  are formed of, for example, Au; however, the connecting layers  106  can be formed of another metal, or of a layer in which plural metals are stacked. For example, the connecting layers  106  can be formed by Au plating, or can be a stud bump of Au by wire bonding.  
         [0057]     Next, in a process shown in  FIG. 2B , a semiconductor element  107  which is an optical function element such as an LED is mounted on the substrate  101 . The semiconductor element  107  is connected to the connecting layers  106  by ultrasonic bonding. Or the semiconductor element  107  can be connected to the connecting layers  106  by wire bonding. In this case, in order to make the bonding ability high, it is preferable that the connecting layers  106  be Au plating layers. The semiconductor element  107  is an optical function element, for example, a photoelectric conversion element such as a photo diode or a light emitting element such as an LED. However, the semiconductor element  107  is not limited to the above elements.  
         [0058]     Next, in a process shown in  FIG. 2C , an optical function layer  108  which operates for a transmission light is formed on the semiconductor element  107  by, for example, coating so as to cover the semiconductor element  107 . With this, a first mounted structure  100  is formed in which structure the substrate  101 , the insulation layer  102 , the via plugs  103 , the pattern wirings  104  and  105 , the connecting layers  106 , the semiconductor element  107 , and the optical function layer  108  are formed.  
         [0059]     For example, when the semiconductor element  107  is a photoelectric conversion element such as a photo-detecting element, the optical function layer  108  is a filter which blocks a predetermined wavelength of light input to the semiconductor element  107  or a lens which condenses a predetermined wavelength of light input to the semiconductor element  107 .  
         [0060]     In addition, when the semiconductor element  107  is a light emitting element such as an LED, the optical function layer  108  is a filter which blocks a predetermined wavelength of light emitted from the semiconductor element  107 , a lens which condenses a predetermined wavelength of light emitted from the semiconductor element  107 , or a fluorescent substance layer by which a desired color light is obtained.  
         [0061]     In the present embodiment, the semiconductor element  107  is an LED and the optical function layer  108  is a fluorescent substance layer. By combining the LED  107  with the fluorescent substance layer  108 , an emitted color light can be changed to a desired color light.  
         [0062]     It is preferable that the optical function layer  108  be formed by coating a fluorescent substance by, for example, an inkjet method. When the inkjet method is used, the uniformity of the thickness of the fluorescent substance layer can be excellently obtained, compared with cases of using a screen printing method, a dispenser, a spray coater, or a roll coater. Therefore, the irregularity of light emission in the semiconductor device can be prevented. In addition, in the inkjet method, a mask is not needed and the coating can be executed at high speed and high efficiency, further, the coating can be applied at a necessary position with a necessary thickness by patterning. Therefore, the coating can be applied to a position such as a cavity where a concave part is formed. In addition, the uniformity of the concentration of the fluorescent substance can be excellent when the fluorescent substance layer is formed by the inkjet method.  
         [0063]     Next, in a process shown in  FIG. 2D , the first mounted structure  100  is put on an inspection board  310 . Test wirings (contact probes)  311  are formed on the inspection board  310  to connect to the pattern wirings  105 .  
         [0064]     The first mounted structure  100  is connected to an inspection circuit (not shown) via the test wirings  311  and the semiconductor element  107  mounted on the substrate  101  is inspected. The test wirings  311  are contact probes or connector pins which are electrically connected to the semiconductor element  107  and execute various inspections by driving the semiconductor element  107 . The contact probes or the connector pins are shaped to form a spring so as to contact the pattern wirings  105  by a force of elasticity and be electrically connected to the pattern wirings  105 .  
         [0065]     For example, in the present embodiment, a light emission inspection of an LED (the semiconductor element  107 ) is executed using power supplied via the test wirings  311 . That is, the LED emits light by being driven and characteristics of the light emission such as intensity and color (wavelength) are inspected. Further, individual differences of the above characteristics among plural LEDs are inspected. As described above, actually, plural LEDs are mounted on the substrate  101 .  
         [0066]     In addition, since the inspection is executed where the optical function layer  108  is formed on the semiconductor element (LED)  107 , a level that color irregularity and thickness non-uniformity of the optical function layer  108  give to the dispersion of the light emission can be also inspected. That is, the light,emission from the semiconductor element  107  combined with the optical function layer  108  can be inspected.  
         [0067]     Next, in a process shown in  FIG. 2E , the first mounted structure  100  is divided into plural first mounted structures  100 A by, for example, dicing by a dicer. That is, the plural first mounted structures  100 A are obtained, in which each structure  100 A provides the substrate  101 , the insulation layer  102 , the via plugs  103 , the pattern wirings  104  and  105 , the connecting layers  106 , the semiconductor element  107 , and the optical function layer  108 . In this case, for example, the first mounted structure  100 A is obtained so that one semiconductor element (LED)  107  is mounted. However, the first mounted structure  100 A can be formed so that plural semiconductor elements (LEDs)  107  are mounted, or the first mounted structure  100 A can be formed so that plural semiconductor elements (LEDs)  107  are mounted with one or more other elements (not shown).  
         [0068]     When a defective semiconductor element  107  and/or a defective optical function layer  108  is detected in the process shown in  FIG. 2D , the first mounted structure  100 A having the defective element and/or the layer is selectively discarded after the process shown in  FIG. 2E .  
         [0069]     Next, in a process shown in  FIG. 2F , a semiconductor device (second mounted structure)  200  is formed by mounting the first mounted structure  100 A on a substrate  201 . The substrate  201  is made of, for example, a ceramic material and a concave section  204  is formed in the substrate  201  to contain the first mounted structure  100 A. Pattern wiring  202  is formed on the bottom surface of the concave section  204  so that the pattern wirings  105  of the first mounted structure  100 A are connected to the pattern wiring  202 . The pattern wirings  105  and the pattern wiring  202  are electrically connected by connecting layers (bumps)  203  made of, for example, solder.  
         [0070]     A side wall surface of the concave section  204  at a position near the opening is formed as, for example, a taper-shaped surface, and a reflection surface  205  is formed on the taper-shaped surface. With this, a light emitted from the semiconductor element (LED)  107  and the optical function layer (fluorescent substance layer)  108  can be efficiently utilized. The reflection surface  205  is formed by sputtering of, for example, a metal, or is formed by polishing the substrate  201 .  
         [0071]     In addition, in  FIG. 2F , after forming the semiconductor device  200 , a cap made of, for example, glass, can be formed so as to seal the concave section  204 .  
         [0072]     In  FIG. 2F , two semiconductor elements  107  are shown; however, the number of the semiconductor elements  107  is not limited to two, one semiconductor element  107  is allowed and three or more semiconductor elements  107  are also allowed, if necessary.  
         [0073]     In the manufacturing method of the semiconductor device according to the present embodiment, the semiconductor element  107  is inspected where the first mounted structure  100  is formed when the semiconductor element  107  is mounted on the substrate  101 . However, conventionally, since a semiconductor element (LED) is directly mounted on a substrate similar to the substrate  201  shown in  FIG. 2F , when a defective semiconductor element and/or a defective optical function layer is detected, the semiconductor device in which the defective semiconductor element and/or the defective optical function layer is mounted must be discarded.  
         [0074]     As described above, in the manufacturing method of the semiconductor device according to the present embodiment, as shown in  FIG. 2D , for the first mounted structure  100 , that is, at a wafer level, each semiconductor element (LED)  107  is inspected. Further, after the inspection, the first mounted structure  100  is divided into plural first mounted structures  100 A, and the semiconductor device  200  is formed by mounting each first mounted structure  100 A on the substrate  201 .  
         [0075]     Therefore, in the present embodiment, a defective semiconductor element  107  and/or a defective optical function layer  108  can be detected before forming the semiconductor device  200 . Further, after the inspection, since the first mounted structure  100  is divided into plural first mounted structures  100 A, the first mounted structure  100 A having the defective semiconductor element  107  and/or the defective optical function layer  108  can be discarded before forming the semiconductor device  200 .  
         [0076]     Consequently, in the semiconductor device (second mounted structure)  200 , the probability of a defective semiconductor element  107  and/or a defective optical function layer  108  being mounted is greatly reduced, and the yield in manufacturing the semiconductor device  200  can be increased. Further, the number of the semiconductor devices  200  which are discarded can be decreased.  
         [0077]     In addition, generally, in order to increase the yield of a semiconductor device, there is a method in which each semiconductor element is inspected before being mounted on a substrate. However, in this case, manufacturing of a special testing jig is required and the inspection requires excessive time. Consequently, it is actually difficult to execute the inspection for each element. In addition, when the semiconductor element is an optical function element, it is impossible to execute an actual characteristic inspection without forming an optical function layer, and further it is impossible to form the optical function layer when the semiconductor element is not mounted on a predetermined substrate.  
         [0078]     As described above, in the present embodiment, as shown in  FIG. 2D , at the wafer level in which plural semiconductor elements  107  are formed, each semiconductor element  107  can be inspected. Therefore, the inspection can be easily executed. Further, the inspection can be executed where the semiconductor element  107  is combined with the optical function layer  108 , that is, for example, an LED is combined with a fluorescent substance layer.  
         [0079]     Especially, when the substrate  101  is a silicon wafer, existing various inspection instruments can be used as they are. In addition, when the substrate  101  is a silicon wafer, an existing pattern wiring technology and an instrument for forming pattern wirings can be used. For example, the via plugs  103  and the pattern wirings  104  and  105  can be easily formed with a fine structure, and the dicing can be easily executed. Further, since silicon has excellent heat conductivity, heat from the semiconductor element  107  can be easily transferred.  
         [0080]     In addition, the structure of the semiconductor device  200  has excellent accuracy for the position and the angle of the semiconductor element  107  when the semiconductor element  107  is disposed on the substrate  201 , compared with a conventional semiconductor device. That is, since the semiconductor element  107  mounted on the substrate  101  is mounted on the substrate  201 , the disposed position and the disposed angle of the semiconductor element  107  can have excellent accuracy for the substrate  201 , compared with a case where a semiconductor element is directly mounted on a substrate of the semiconductor device. Especially, it is generally difficult to mount a fine semiconductor element in a space such as a concave section at high accuracy. However, in the present embodiment, the first mounted structure  100 A can be mounted on the substrate  201  of the semiconductor device  200  at high accuracy.  
         [0081]     In addition, in the process shown in  FIG. 2B , the semiconductor element  107  is connected to the connecting layers  106  (the pattern wirings  104 ) by ultrasonic bonding instead of using solder. Therefore, contamination of the semiconductor element  107  caused by flux at the soldering is avoided. Especially, when the semiconductor element  107  is an optical function element, input or output light to/from the optical function element is likely to be diffused by the contamination caused by flux and so on. Therefore, it is preferable to use a solder-free method such as the ultrasonic bonding for connecting the semiconductor element  107  to the connecting layers  106 .  
         [0082]     On the other hand, in the process shown in  FIG. 2F , since the pattern wirings  105  are connected to the pattern wiring  202  by the connecting layers  203  which are solder bumps, the pattern wirings  105  can be electrically connected to the pattern wiring  202  excellently. In addition, the first mounted structure  100 A can be mounted on the substrate  201  of the semiconductor device  200  at high accuracy due to the self alignment effect of surface tension when the solder is fused.  
         [0083]     In addition, the via plugs  103  are formed in the substrate  101  to penetrate the substrate  101 , and the pattern wirings  105  connected to the via plugs  103  are connected to the pattern wiring  202  at the second side of the substrate  101  via the connecting layers  203 . Therefore, the first mounted structure  100 A can be finely formed.  
         [0084]     In the above description, the wiring structures and the connecting methods are explained. However, the wiring structures and the connecting methods are not limited to the above description. For example, the following modification and variation are possible.  
       Second Embodiment  
       [0085]     Next, a second embodiment of the present invention is described. In the second embodiment, the first embodiment is modified.  FIG. 3  is a schematic cross-sectional view showing a semiconductor device  200 A according to the second embodiment of the present invention. As shown in  FIG. 3 , the semiconductor device  200 A includes a substrate  101 A made of, for example, silicon on which a semiconductor element  107 A is mounted, and a substrate  201 A made of, for example, a ceramic material on which the substrate  101 A is mounted.  
         [0086]     The semiconductor element  107 A is similar to the semiconductor element  107  in the first embodiment and has a structure similar to the structure of the semiconductor element  107 . Further, an optical function layer  108 A similar to the optical function layer  108  in the first embodiment is formed on the semiconductor element  107 A.  
         [0087]     A concave section  204 A which contains the substrate  101 A on which the semiconductor element  107 A is mounted is formed in the substrate  201 A. The concave section  204 A is similar to the concave section  204  in the first embodiment.  
         [0088]     The substrate  101 A is adhered to the substrate  201 A by an adhering layer  110  so that the substrate  101 A is contained in the concave section  204 A. A side wall surface of the concave section  204 A at a position near the opening is formed as, for example, a taper-shaped surface, and a reflection surface  205 A is formed on the taper-shaped surface. With this, a light emitted from the semiconductor element (LED)  107 A and the optical function layer (fluorescent substance layer)  108 A can be efficiently utilized. The reflection surface  205 A is formed by sputtering of, for example, a metal, or is formed by polishing the substrate  201 A.  
         [0089]     Pattern wirings  103 A made of, for example, Cu are formed on the substrate  101 A via an insulation layer  102 A, and connecting layers  106 A having a structure similar to the connecting layers  106  in the first embodiment are formed on the pattern wirings  103 A. The semiconductor element (LED)  107 A is connected to the connecting layers  106 A by ultrasonic bonding similar to the first embodiment.  
         [0090]     Pattern wiring  202 A made of, for example, Cu is formed on the substrate  201 A, and the pattern wiring  202 A is connected to the pattern wirings  103 A by wires  103 B by wire bonding.  
         [0091]     In the semiconductor device  200 A according to the second embodiment, the via plugs  103  which penetrate the substrate  101  in the first embodiment are not formed. However, as described above, the pattern wiring  202 A on the substrate  201 A is connected to the pattern wirings  103 A on the substrate  101 A by the wires  103 B.  
         [0092]     Therefore, in the second embodiment, the forming and connection methods of the pattern wirings are easy and the manufacturing processes of the semiconductor device  200 A are simplified.  
         [0093]     Further, in  FIG. 3 , after forming the semiconductor device  200 A, a cap made of, for example, glass can be formed so as to seal the concave section  204 A.  
         [0094]     In addition, the number of the substrates  101 A having the semiconductor element  107 A, which is mounted on the substrate  201 A, is not limited to one. For example, as shown in  FIG. 4 , plural substrates  101 A having the semiconductor element  107 A can be mounted on the substrate  201 A. In this,  FIG. 4  is a schematic cross-sectional view showing a modified example of the second embodiment shown in  FIG. 3 .  
         [0095]     Further, in  FIG. 4 , after forming the semiconductor device  200 A, a cap made of, for example, glass can be formed so as to seal the concave section  204 A.  
         [0096]     A substrate on which a semiconductor element is mounted is not limited to the substrates described in the first and second embodiments, and the following shapes and structures can be applied to the substrate.  
       Third Embodiment  
       [0097]     Referring to  FIG. 5 , a semiconductor device according to a third embodiment of the present invention is described.  FIG. 5  is a schematic cross-sectional view showing a semiconductor device  200 B according to the third embodiment of the present invention. As shown in  FIG. 5 , the semiconductor device  200 B includes a substrate  101 B made of, for example, silicon on which a semiconductor element  107 B is mounted, and a substrate  201 B made of, for example, a ceramic material on which the substrate  101 B is mounted.  
         [0098]     The semiconductor element  107 B is similar to the semiconductor element  107  in the first embodiment and has a structure similar to the structure of the semiconductor element  107 . The semiconductor element  107 B is mounted on the substrate  101 B so that the semiconductor element  107 B is contained in a concave section  111  formed in the substrate  101 B. The concave section  111  is formed as an approximate rectangular parallelopiped shape or an approximate cylindrical shape by etching the substrate  101 B. After mounting the semiconductor element  107 B in the concave section  111 , the concave section  111  is filled with an optical function layer  108 B. The optical function layer  108 B is made of a material similar to the material (fluorescent substance) of the optical function layer  108  in the first embodiment. The concave section  111  can be sealed by a lid section  112  made of, for example, glass.  
         [0099]     Via plugs  103 B are formed in the substrate  101 B so as to penetrate the bottom part of the concave section  111 . Pattern wirings  104 B are formed on one end of the via plugs  103   b  and pattern wirings  105 B are formed on the other end of the via plugs  103 B. An insulation layer  102 B is formed between the via plugs  103 B and the substrate  101 B, on the inner wall surface of the concave section  111 , and on the bottom surface of the substrate  101 B. The semiconductor element  107 B is connected to the pattern wirings  104 B via connecting layers  106 B by ultrasonic bonding. The pattern wirings  105 B are connected to pattern wiring  202 B formed on the substrate  201 B via connecting layers (bumps)  203 B made of solder.  
         [0100]     As described above, in the third embodiment, the semiconductor element (LED)  107 B is mounted on the substrate  101 B so that the semiconductor element  107 B is contained in the concave section  111 .  
       Fourth Embodiment  
       [0101]     Referring to  FIG. 6 , a fourth embodiment of the present invention is described.  FIG. 6  is a schematic cross-sectional view showing a semiconductor device  200 C according to the fourth embodiment of the present invention. In  FIG. 6 , a substrate  101 C, an insulation layer  102 C, via plugs  103 C, pattern wirings  104 C and  105 C, connecting layers  106 C, a semiconductor element  107 C, and a lid  112 C are similar to the substrate  101 B, the insulation layer  102 B, the via plugs  103 B, the pattern wirings  104 B and  105 B, the connecting layers  106 B, the semiconductor element  107 B, and the lid  112  in the third embodiment. The structure of the semiconductor device  200   c  is similar to that of the third embodiment. In addition, in  FIG. 6 , a substrate  201 B, pattern wirings  202 B, and connecting layers  203 B are the same as those in the third embodiment.  
         [0102]     However, in the fourth embodiment, a concave section  111 C is different from the concave section  111  in the third embodiment and has a taper shape. Further, a reflection surface  111 D is formed on the inner surface of the taper-shaped part of the concave section  111 C. With this, a light emitted from the semiconductor element (LED)  107 C can be efficiently utilized. Further, in the third embodiment, the concave section  111  is fully filled with the optical function layer  108 B; however, the concave section  111 C is not entirely filled with an optical function layer  108 C. That is, the optical function layer  108 C is selectively formed to cover the semiconductor element  107 C. In this, the concave section  111 C can be fully filled with the optical function layer  108 C.  
         [0103]     According to the embodiments of the present invention, as described above, the semiconductor device can be formed by changing the wiring structures and the shape of the substrates.  
         [0104]     As described above, according to the embodiments of the present invention, an individual difference among plural semiconductor elements which are mounted on a substrate can be prevented and the yield in manufacturing a semiconductor device can be increased.  
         [0105]     Further, the present invention is not limited to these embodiments, but variations and modifications may be made without departing from the scope of the present invention.  
         [0106]     The present invention is based on Japanese Priority Patent Application No. 2005-204794, filed on Jul. 13, 2005, with the Japanese Patent Office, the entire contents of which are hereby incorporated by reference.