I'm gonna give Inovalight some credit for working on this fascinating new energy idea called Solar Ink. Based on a solvent-based silicon nanomaterial platform, this ink uses what can only be referred to as "quantum dots" that can be printed using the same technology as printing on paper. So, put these dots on any flexible surfaces—like clothing or portable chargers—and you're good to go. The company also claims that by controlling the size of the dots, they can also tailor what part of the light spectrum gets captured, meaning everything from infrared to ultraviolet. Not bad, considering conventional technology can only absorb the visible spectrum.
Solar Ink Being Developed by Inovalight