Energy harvesting, IoT power, Solar Auto Bodywork, Wearables, and Smart Buildings. A bicycle helmet with a flashing light and no batteries, a beach umbrella that can charge your phone. The ability to generate power from your curtains, the furniture, and any surface, even in ambient light.
Printable, rollable, roll-to-roll manufactured at ultra-low cost, photovoltaic cells. They may not be ready to compete with silicon cells in the solar park, but the secondary applications are limitless.