Solar Energy: Cheaper Solar Concentrator With Fewer Photovoltaic Cells

A new solar concentrator design from an electrical engineering Ph.D. student at the University of California, San Diego could lead to solar concentrators that are less expensive and require fewer photovoltaic cells than existing solar concentrators. The graduate student, Jason Karp and his colleagues at the UC San Diego Jacobs School of Engineering presented the new solar concentrator in a paper in the January 2010 issue of the journal Optics Express.

While engineers have already developed high-efficiency solar concentrators that incorporate optics to focus the sun hundreds of times and can deliver twice the power of rigid solar panels, the new design offers potential new benefits. Existing solar concentrator systems typically use arrays of individual lenses that focus directly onto independent photovoltaic cells which all need to be aligned and electrically connected. In contrast, the new solar concentrator collects sunlight with thousands of small lenses imprinted on a common sheet. All these lenses couple into a flat “waveguide” which funnels light to a single photovoltaic cell.

Karp built a working prototype with just two primary optical components, thus reducing materials, alignment and assembly. This solar concentrator is compatible with high-volume, low-cost manufacturing.

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