Replication of a large size Fresnel type concentration lens for photovoltaic solar cell using spin coating
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In this study, we applied spin coating method to replicate a large size solar concentration lens. Although power generation from photovoltaic solar cell is a clean energy resource from the nature, its applications are limited due to its high cost and low efficiency. To challenge these difficulties, concentrated photovoltaic (CPV) solar cell attracts attention. The solar concentration lens is usually made of plastic materials and replicated by hot embossing and injection molding methods. However, plastic lenses have weak durability for heat and UV. Therefore, silicone based lenses are presented. Moreover, the spin coating method can replicate a large size micro-patterned lens from silicone material at room temperature and atmospheric pressure. In particular, Fresnel type of lens design is suitable for spin coating due to its thin and uniform thickness. The diameter of the lens is 160 mm to achieve X 1000 of concentration ratio. The diameter and optical power of focused beam are measured along the distance, and the generated power is also compared between non-concentrated and CPV solar cell.
