Solar cell is the key device in generating electrical power for spacecrafts. It is an on-going challenge in maximizing electrical power available to spacecraft while reducing overall stowage volume and mass of solar array. While the "record" solar cells approach the theoretical limit after several decades of extensive R&D effort, it becomes ever-increasingly difficult and cost prohibitive to further increasing their efficiency, by continuingly playing with existing solar cell fabrication protocols. Sun Innovations proposes a highly innovative alternative approach in significantly increasing the solar cell efficiency (~10%), specific power density, the radiation resistance and lifetime, without adding much cost and weight to the existing solar cells. It is also a generic approach that shall enhance the efficiency and lifetime of most commercial solar cells for broad based commercial benefits. The key nano-crystalline materials will be developed in Phase I, to demonstrate the feasibility of the approach in record cells. The technology will be further developed in Phase II to be ready for commercialization in Phase III.