| Summary: | 碩士 === 國立高雄應用科技大學 === 模具工程系 === 100 === This study will explores the solar cell conversion efficiency of the Fresnel lenses of different materials. Besides, this thesis also discusses the process of replication of injection molding, injection compression molding, hot embossing and R2R UV-NIL production Fresnel lens. The experiment is divided into two major parts: the first part is the Fresnel lens production, using injection molding and injection compression molding, hot embossing and R2R UV-NIL process of making Fresnel lenses.
The second part is the lens contour measurement and cell efficiency measurement: using the Fresnel lens surface profiler to measure the different production processes, investigating the replication of processes and using the light generated by the solar simulator, through the Fresnel lens to gather light to solar cells so as to enhance the conversion efficiency of the cell, and discussing the effect with different lens materials and lens replication on the cell conversion efficiency.
The experiment result showed that the Fresnel lens produced by the injection molding, injection compression forming and hot embossing can reach more than 98% of the lens replicability. Besides, the conversion efficiency of solar cells increases slightly as well when the replicability of the lens increases, During the R2R UV-NIL processing, bobbles appear on the lens’ surface and the forming result is not good as expected due to the shape of the lens. Therefore, this process is not suitable for the circular Fresnel lens. When the distance between the lens and the cell is within 100 mm, the cell conversion efficiency increases with the increase of the distance of the lens and the cell. However, if the distance between the lens and the battery is more than 100 mm, the conversion efficiency of the cell decreases with the increase of the distance of the lens and the cell, which is the same trend with the optical simulation. With PMMA, PC, COC lens, cell conversion efficiency increases 4.62%, 3.52% and 4.86%, showing that the lens material does not have obvious impacts on the solar cells the conversion efficiency.
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