Multilayer Optimized Uniform Nanomachined Diffractive Solar Wrap (MOUND)

This work develops a novel, rollable, mass fabricable, low-concentration photovoltaic sheets for Cubesats providing them with efficient photoelectric
conversion of direct and secondary diffuse light. The wrap consists of three thin (of order a millimeter or less), cheap plastic-sheet layers which concentrate (10x) on silicon strips.

Innovation: Although CPV has been used for small satellites including, they require precise tracking and active thermal management systems. We have built a CPV system that mitigates this completely leveraging non-imaging optics and nano-manufacturing techniques. Specifically, our innovations include:
· A design for a flat angular response curve which remains flat from normal incidence of over 35 degrees to the normal without tracking
· Diffraction Efficiency Modulation (DEM). MOUND shunts IR wavelengths in between cells optimizing cell performance.
· Mass-fabricable and Rollable. A master is fabricated enabling mass-replication via roll to roll UV embossing on cheap flexible plastic sheets. Technology can be used in flexible and rollable space applications.