Globally, there are different-different research centers involved in searching a solution to the energy consumption of mobile phones. To build more strong you have to have long time battery backup and performance. The French company Wysips, however, proposes another latest technology based solution.
It been capable to build a film of solar panels just hundred microns thick. You could enter the film in a layer of the screen of the mobile phones to recharge the battery using sun light. According to the first test enough six hours of exposure to external light to completelly charge the battery. With an hour of charging you can talk for thirty minutes.
