Batteries: thermoelectric and photoelectric – Photoelectric – Panel or array
Patent
1995-04-07
1996-11-26
Weisstuch, Aaron
Batteries: thermoelectric and photoelectric
Photoelectric
Panel or array
136259, 257433, 257789, 257795, H01L 31048
Patent
active
055781411
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
1. Field of the Invention
The present invention relates to a solar cell module having excellent weather resistance. More particularly, the present invention concerns an improved solar cell module in which at least the light receiving surface of a photovoltaic element (or solar cell) in the solar cell module is coated with a composition containing vinylidene fluoride copolymer and acrylic resin for achieving a desirable photoelectric conversion efficiency over a long period of time even in a severe environment.
2. Related Art
A number of thin film solar cells have been proposed. An amorphous silicon thin film solar cell (a-Si thin film solar cell) is representative of these thin film solar cells. As the a-Si thin film solar cell, there has been known a solar cell having a construction in which an a-Si semiconducting film as a photoelectric conversion element is provided on a conductive substrate made of a metal layer and a transparent conductive layer is provided on the semiconducting film. In the case where the a-Si thin film solar cell having such a construction is used as a power supplying means, differently from a solar cell of a type in which a glass plate is used as a substrate, a light incident surface of the a-Si thin film solar cell is provided with a means for protecting the surface, that is, a transparent coating material. As the protective means, there is known a construction in which a transparent surface resin layer composed of a fluoride polymer thin film such as a fluororesin film or fluororesin paint is provided on the outermost surface side, and a filler composed of various transparent thermoplastic organic resins is provided below the surface resin layer.
More specifically, as the above surface resin layer, there is used a fluororesin film such as a tetrafluoroethylene-ethylene copolymer film or a polyvinyl fluoride film. The above mentioned filler is interposed between the surface resin layer and the solar cell. As the filler, there is used a resin such as EVA (ethylene-vinyl acetate copolymer) or butyral resin. A back face film is provided on the back face of the above conductive substrate of the solar cell by way of the filler. As the back face film, there is used a nylon film, an aluminum laminated tedlar film, or the like. In addition, the practical solar cell module has a supporting member provided under the back face film by way of the filler.
Accordingly, with respect to the filler interposed between the surface resin layer and the photovoltaic element, the filler interposed between the conductive substrate and the back face film, and the filler interposed between the back face film and the supporting member, each of them requires an adhesive function, and a function of protecting the outside of the photovoltaic element in terms of scratch and impact resistance.
However, when used in the outdoors for a long period of time (for example, 20 years), the prior art solar cell module having the above coating material composed of the surface resin layer and the filler presents the following disadvantage: namely, unsaturated double bonds are present in the main chain of the filler resin and they are conjugated; consequently, the solar cell module exhibits light absorption in the ultraviolet region or in the visible region having a wave length longer than that of the ultraviolet region. In other words, the prior art solar cell module has a disadvantage particularly in terms of weather resistance.
To solve the above-described disadvantage of the prior art solar cell module, Unexamined Japanese Patent No. SHO 58-60579 (hereinafter, referred to as "reference 1") has proposed a technique in which an ethylene series copolymer resin containing a coupling agent and an organic peroxide is used as the resin for the filler of the coating material of the solar cell module. According to the description of the reference 1, as the ethylene series copolymer resin, there may be used ethylene-vinyl acetate copolymer (hereinafter, in some cases, referred to as "EVA") containing vinyl acetate
REFERENCES:
patent: 5344498 (1994-09-01), Inoue
patent: 5389159 (1995-02-01), Kataoka et al.
Itoyama Shigenori
Kataoka Ichiro
Mori Takahiro
Yamada Satoru
Canon Kabushiki Kaisha
Weisstuch Aaron
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