Patent Application
20110056530
1. Field of the Invention
The present invention relates to a high concentrated photovoltaic (HCPV) solar cell module, and in particular to a HCPV solar cell module utilizing Fresnel lens to concentrate sunlight.
2. The Prior Arts
Presently, in the energy regeneration resources, the high concentrated photovoltaic (HCPV) solar energy power generation system is the most promising one for its various advantages of material saving, low power cost, and high power generation efficiency, and it is generally considered as most suitable for used in a solar energy power plant, and is a mainstay and key-point in the development of the solar energy industry in the future. The high concentrated photovoltaic (HCPV) solar energy power generation system combining the high power Group III-V semiconductor solar cell and Fresnel Lens catches most of the attention for its capability of reducing the power generation cost significantly.
Refer to
However, the Fresnel lens utilized in a conventional high concentrated photovoltaic (HCPV) solar cell module is a structure made of a single layer of material, and its light concentration capability is rather insufficient, thus the high photoelectric conversion efficiency of the Group III-V semiconductor solar cell can not be fully utilized, therefore its power output is inadequate, and the cost benefit of the overall high concentrated photovoltaic (HCPV) solar cell module is not satisfactory.
In view of the problems and shortcomings of the prior art, a major objective of the present invention is to provide a high concentrated photovoltaic (HCPV) solar cell module, which utilizes a plurality of stacked-up Fresnel lenses in achieving focusing sunlight with a high concentration ratio, thus enhancing and raising the photoelectric conversion efficiency of the Group III-V semiconductor solar cell, in solving the problems and shortcomings of the prior art.
In order to achieve the above mentioned objective, the present invention provides a high concentrated photovoltaic (HCPV) solar cell module, comprising: a set of Fresnel lenses made of a plurality of thin, light-weight, and low-cost Fresnel lenses, a Group III-V semiconductor solar cell of high photoelectric conversion efficiency, and a substrate. In other words, instead of a single piece Fresnel lens utilized in the prior art, the present invention provides two or more Fresnel lenses, that are stacked on each other in an up-and-down manner and is disposed opposite and above the Group III-V semiconductor solar cell; and when it is irradiated by the sunlights, it will focus and concentrate the sunlights on the Group III-V semiconductor solar cell with high concentration ratio, in achieving high photoelectric conversion efficiency and large power output, thus reducing the number of the Group III-V semiconductor solar cells and high concentrated photovoltaic (HCPV) solar cell modules required, hereby lowering its production cost. In the process mentioned above, the temperature of the Group III-V semiconductor solar cells will be increased through the sunlights absorbed, and the heat thus generated will be dissipated into the ambient air through a substrate located at the bottom of the Group III-V semiconductor solar cell. Moreover, the present invention may also include a heat-electric conversion cell or a long wavelength solar cell, wherein, heat is converted into electricity, hereby further increasing its overall photoelectric conversion efficiency and the power generation efficiency.
Further scope of the applicability of the present invention will become apparent from the detailed descriptions given hereinafter. However, it should be understood that the detailed descriptions and specific examples, while indicating preferred embodiments of the present invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from this detailed descriptions.
The related drawings in connection with the detailed descriptions of the present invention to be made later are described briefly as follows, in which:
The purpose, construction, features, functions and advantages of the present invention can be appreciated and understood more thoroughly through the following detailed description with reference to the attached drawings.
Firstly, refer to
In the structure mentioned above, the set of Fresnel lenses are made of a plurality of Fresnel lenses, in the present embodiment, two Fresnel lenses are utilized as an example, but in actual application, it is not limited to this. Moreover, in the present invention, the set of Fresnel lenses are designed to produce varied power output depending on the angles formed by the Fresnel lenses. The first Fresnel lens 110 and the second Fresnel lens 120 are made of material of excellent optical property, such as the light transmission resin PMMA, PC, or PE, with its structure having saw-tooth mirrors on its lower side with gradually increasing angles outward, and with its texture made through utilizing light interference, diffraction, and receiving angle. In general, its focal length is designed as from 1 mm to 100 cm, with a light concentration ratio of 2×-1000×. In case that the first and second Fresnel lenses 110 and 120 are made of PMMA material, the flexibility of the Fresnel lenses can make them operate smoothly with the solar cells. Refer to
The Group III-V semiconductor solar cell 130 is disposed opposite to the first and second Fresnel lenses 110 and 120, and absorbs the sunlights focused and concentrated by the first and second Fresnel lenses 110 and 120, and converts them into electricity for output. Compared with the ordinary silicon crystal solar cell, the Group III-V semiconductor solar cell 130 is able to absorb energy of wider range of sunlight spectrum, thus its photoelectric conversion efficiency is increased significantly. In the present embodiment, the Group III-V semiconductor solar cell 130 is made of the materials selected from a group consisting of GaAs, GaP, InP, AlGaAs, GaInAs, AlGaP, GaInP, AlGaAsP, InGaAsP, AlGaInAsP, or their combinations. Alternatively, the Group III-V semiconductor solar cell 130 can be made of the materials selected from a group consisting of GaN, InN, GaAl, AlGaN, AlInN, AlInGaN, or their combinations. The substrate 140 is designed to have good heat dissipation capability, and is made of materials selected from a group consisting of: Ag, Cu, Al, Ni, Au, or their alloys. Therefore, the high temperature generated by the Group III-V semiconductor solar cell 130 through the sunlights concentrated by the first and second Fresnel lenses 110 and 120 can be dissipated into the ambient air through a substrate 140 disposed at the bottom of the solar cell 130, so that it may operate in an appropriate temperature, hereby prolonging the service life of the Group III-V semiconductor solar cell 130.
In passing through the second Fresnel lens 120 and the first Fresnel lens 100 sequentially, sunlights will be concentrated onto the Group III-V semiconductor solar cell 130 with a high concentration ratio, thus raising its photoelectric conversion efficiency significantly, achieving higher power output, while reducing the number required and area occupied by the Group III-V semiconductor solar cell 130, in realizing the reduction of its production cost.
Refer to
In addition, refer to
Finally, refer to
The above detailed description of the preferred embodiment is intended to describe more clearly the characteristics and spirit of the present invention. However, the preferred embodiments disclosed above are not intended to be any restrictions to the scope of the present invention. Conversely, its purpose is to include the various changes and equivalent arrangements which are within the scope of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 098130183 | Sep 2009 | TW | national |
