The plan is to replace rechargeable batteries in mobile devices with a miniature version of the hydrogen fuel cell used to power electric cars. A superefficient solar cell built into the devices would recharge the miniature fuel cell.Not sure how feasible this really is, as everything I've heard from the people that I know over at Ballard is that fuel cells really aren't ideal small devices, but it's still an interesting idea.
"The decisive factor," said Christopher Hebling, head of the Micro-Energy Technology group at the ISE, "is that the device can run on solar power alone even under low lighting levels. At a normal workplace, you have only 3 percent of the brightness of summer sunshine. Even down to a level of 1 percent, the electrical voltage provided by our solar module remains virtually constant. In conventional cell types, it would have long since broken down."