Transparent photovoltaics have yet to grace the face of your smartphone, but don't give up hope — UCLA researchers are working on a new see-through solar cell that's showing potential. Using a new type of polymer solar cell, the team has been able to build a device that converts infrared light into electrical current. Current prototypes boast 4 percent energy conversion efficiency at 66 percent transparency — not crystal clear, but certainly clean enough to peer through. According to a stud…