Published online by Cambridge University Press: 05 February 2016
We report the experimental demonstration of a low-cost paradigm for photovoltaicpower generation that utilizes a prismatic Fresnel-like lens to simultaneouslyconcentrate and separate sunlight into laterally spaced spectral bands. Theoptical element is designed using geometric optics and optical dispersion andits performance is simulated with a ray-tracing software. The device, fabricatedby injection molding, suitable for large-scale mass production, isexperimentally characterized. We report an average optical transmittance above85% over the VIS-IR range and spectral separation in excellent agreement withour simulations. Finally, the system is tested with a pair of copper indiumgallium selenide based solar cells. We demonstrate an increase in peakelectrical power output of 160% under outdoor sunlight illumination,corresponding to an increase in power conversion efficiency of 15% relative tosingle-junction full-spectrum one-sun illumination. Given the ease ofmanufacturability and the potential of the proposed solution, we project thatour design can provide a cost-effective alternative to multi-junction solarcells ready for mass production.