Abstract:
The application illustrates a solar cell module, included a base device, a solar cell on the base device, and a concentrator on the solar cell. The concentrator directly contacts with the solar cell and concentrates the light to the solar cell for opto-electric transformation.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the right of priority based on Taiwan Patent Application No. 098123682 entitled “A Solar Cell Module and the Fabrication Method of the Same”, filed Jul. 13, 2009, which is incorporated herein by reference and assigned to the assignee herein. 
       TECHNICAL FIELD 
       [0002]    The application generally relates to a solar cell module and the fabrication method of the same, and more particularly to a solar cell module with a concentrator combined a primary concentration device with a secondary concentration device and the fabrication method of the same. 
       BACKGROUND 
       [0003]    Due to the shortage of the petroleum energy, people are much aware of the importance of the environment protection, and thus research and develop aggressively the technology relates to the substitute energy and the recycle energy in recent years. The goal is to reduce the dependence upon the petroleum energy and the influence of such use on the environment. In numerous technologies of the substitute energy and the recycle energy, the solar cell is the most noticeable. Because the solar cell can directly transfer the solar energy to the electrical energy without generating the harmful material such as carbon dioxide or nitrides during process, the pollution to the environment is largely reduced. 
         [0004]    The efficiency of electric power generation of the solar cell module structure is currently improved by using the huge lens to focusing the light on a small area. Beside, the solar cell can work well only when it is located nearby the focal point. As  FIG. 1  shows, the sun light is concentrated on the solar cell  18  by using the huge lens  2 , and it has a focal length D between the huge lens  2  and the solar cell  18  which is about tens centimeters. The solar cell module formed by the above structure is large-sized and expensive. 
       SUMMARY 
       [0005]    The application provides a concentrator on the solar cell module comprising a primary concentration device and a secondary concentration device, wherein the primary concentration device further comprising a reflective concentration device formed by a plurality of reflective concentration lens. 
         [0006]    The application provides a concentrator for the solar cell module comprising a primary concentration device and a secondary concentration device, wherein the secondary concentration device further comprises a light-guiding concentration device, which can be a light-guiding plate. 
         [0007]    The application provides a concentrator for the solar cell module comprising a primary concentration device and a secondary concentration device, wherein the secondary concentration device further comprises a light-guiding concentration device, wherein the front side of the light-guiding concentration device is a flat plane, the back side of the light-guiding concentration device has a particular angle or configuration that can direct the light to a certain direction. 
         [0008]    The application provides a concentrator on the solar cell module comprising a primary concentration device and a secondary concentration device, wherein the secondary concentration device further comprises a light-guiding concentration device, wherein the back side of the light-guiding concentration device is a flat plane, inclined plane, paraboloid plane, complex plane, or aspherical reflective plane. 
         [0009]    The application provides a concentrator on the solar cell module comprising a primary concentration device and a secondary concentration device, wherein the secondary concentration device further comprising a light-guiding concentration device, wherein the front side of the light-guiding concentration device is a flat plane, and the back side of the light-guiding concentration device is a pyramidal or protuberance reflective structure that can direct the light to a certain direction. 
         [0010]    The application provides a solar cell module having a base device comprising a back substrate and a heat sink on the back substrate, wherein the back substrate comprises a material having a good thermal conductivity like metal, semiconductor, or ceramic. 
         [0011]    The application provides a solar cell module having a base device comprising a back substrate and a heat sink on the back substrate, wherein the heat sink comprises a material having a good thermal conductivity like metal, semiconductor, or ceramic. 
         [0012]    The application provides a solar cell module, wherein the solar cell is a concentration-type solar cell. 
         [0013]    The application provides a solar cell module, wherein the solar cell is formed by the semiconductor material. 
         [0014]    The application provides a solar cell module, wherein the concentrator directly contacts with the solar cell and directs the light to the solar cell for opto-electric transformation. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]    The foregoing aspects and many of the attendant advantages of this application will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein: 
           [0016]      FIG. 1  illustrates a known solar cell module structure; 
           [0017]      FIG. 2  illustrates a sectional view of the solar cell module in accordance with one embodiment of the present application; 
           [0018]      FIG. 3  illustrates a sectional view of the reflective concentration device in accordance with one embodiment of the present application; 
           [0019]      FIG. 4  illustrates a sectional view of the light-guiding concentration device in accordance with one embodiment of the present application; 
           [0020]      FIG. 5  illustrates a sectional view of the base device in accordance with one embodiment of the present application; 
           [0021]      FIG. 6  illustrates a sectional view of the solar cell module in accordance with another embodiment of the present application; 
           [0022]      FIG. 7  illustrates a sectional view of the solar cell module in accordance with another embodiment of the present application. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0023]    A solar cell module section view structure in accordance with one embodiment of the application shown in  FIG. 2 , it comprises a base device  50 , a solar cell  18 , and a concentrator  60 , wherein the concentrator comprises a primary concentration device  30  and a secondary concentration device  40 . The primary concentration device further comprises a reflective concentration device formed by the plurality of reflective concentration lens. The focal length of the reflective concentration lens is about several centimeters, which is smaller than that of the huge lens  2  shown in  FIG. 1 , so the volume of the solar cell module with a primary concentration device  30  in accordance with one embodiment of the application is much smaller than that of the conventional solar cell module. The secondary concentration device  40  further comprises a light-guiding concentration device  19 , wherein the light-guiding concentration device can be a light-guiding plate. The light is focused by the primary concentration device  30  then injected into the secondary concentration device  40 . The light-guiding concentration device  19  of the secondary concentration device  40  can diffuse and propagate the light because of the total reflection that occurs when the index of refraction of the light-guiding material is higher than that of the external medium. The light injected from different angles is reflected by the reflective coating layers  13 ,  14  on the front side and the back side of the light-guiding concentration device, and is concentrated on and absorbed by the solar cell  18  located at the center for opto-electric transformation by operating with the suitable angle and configuration of the back side of the light-guiding concentration device. The current generated by the opto-electric transformation can be conducted by the circuitry (the figure is not shown) designed between the heat sink  15  and the back substrate  16  of the base device. 
         [0024]    The manufacture steps of the above mentioned solar cell module are described in below: 
         [0025]    A concentrator  60  is formed by a primary concentration device  30  combined with a secondary concentration device  40 . The primary concentration device  30  comprises a reflective concentration device formed by a plurality of reflective concentration lens  11 . As  FIG. 3  shows, the light-incident surface of the reflective concentration lens can be shaped in circular, square, oval-shaped, or polygon. Opening  11 A allows the light being injected into the secondary concentration device  40 . 
         [0026]    A secondary concentration device  40  is located below the primary concentration device  30  and comprises a light-guiding concentration device  19  to have the light focus on the center region as shown in  FIG. 4 . The light-guiding concentration device  19  is a device having the front side as a flat plane and the back side with suitable angle and configuration which is made of the light-guiding material by the injection, sawing, polishing, or sculpture technology. The back side of the light-guiding concentration device can be a flat, inclined, parabolic, compound parabolic, or non-spherical reflective plane. By lithography process, the photo resist is defined in the light-incident area  19 A on the front side of the secondary concentration device, and in the area  19 B located on the back side of the secondary concentration device where the light is focused and propagated to the solar cell, then the front side and the back side of the second concentration device are coated with reflective material such as metal like silver, aluminum metal, or dielectric layer like silicon oxide, titanium oxide, aluminum oxide. Finally, the photo resist is removed, and the front light-incident area  19 A and the back side output light area  19 B of the secondary concentration device is exposed to complete the reflective coating layers  13 ,  14  manufacturing process. Further, to facilitate the light collected from the reflective concentration lens  11  to be injected into the secondary concentration device  40  and to be propagated to the solar cell  18  from the secondary concentration device, an anti-reflective coating layer  20  is formed to cover the whole surface of the front reflective coating layer  13  and/or the back reflective coating layer  14  of the secondary concentration device respectively by evaporation or deposition. The secondary concentration device comprises plastic, glass, or organic material. 
         [0027]    The solar cell  18  can be a concentrative solar cell in this embodiment, which is a multi junction solar cell made of the semiconductor material. The solar cell  18  is connected with the back substrate  16  and the heat sink  15  by the metal connecting layer  12 , and a circuitry is formed (the figure is not shown) between the back substrate and the heat sink to conduct the current generated by the solar cell form the bottom thereof. Beside, an isolation layer  17  is formed on two sides of the solar cell  18  by the isolation glue to be isolated from the heat sink  15  as shown in  FIG. 5 . The back substrate  16  can comprise a material having a good thermal conductivity like metal, semiconductor, or ceramic. The heat sink  15  can comprise a material having a good thermal conductivity like metal, semiconductor, or ceramic. 
         [0028]    Then, the opening  11 A is aligned and combined with the front light-incident area  19 A of the secondary concentration device to form a concentrator  60 , and the concentrator is combined with the base device  50  of the solar cell  18 , so the concentrator can directly contact with the solar cell to collect the light into the solar cell and proceed the opto-electric transformation. The solar cell module  10  is then accomplished with a small area which can achieve low cost, large area effect, high efficiency without a huge concentration module as  FIG. 2  shows. 
         [0029]    Besides the above embodiments, this application includes another two embodiments disclosing the following various structures. As  FIG. 6  shows, the solar cell  18  concentrated the light is disposed on the sidewall of the light-guiding concentration device  19 . After the light is concentrated by the primary concentration device, it is injected into the secondary concentration device, and the light injected in different angles is reflected in the secondary concentration device. With the suitable angle and configuration of the back side, the light can be reflected and focused on the solar cell  18  and absorbed for the opto-electric transformation. The current generated by the transformation is conducted by the circuitry designed between the heat sink  15  and the back substrate  16  of the base device  50  (not shown in the figure). Another structure has a flat front side and flat backside for the light-guiding concentration device  19 , and has a pyramidal or protuberance reflective structure  21  located on the back side of the light-guiding concentration device below the secondary concentration device corresponding to the opening  11 A to reflect the direct incident light with certain angle(s) to be focused on the concentration direction of the solar cell  18 . Please refer to  FIG. 7 . 
         [0030]    Other embodiments of the application will be apparent to those having ordinary skill in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.