Switzerland, Solar cells, Solar energy
Power of the Sun. Dirt cheap In the late 1980s, the German-born chemist Michael Grätzel literally tied his name to an invention that is hailed as a revolution in renewable energy .
Nano-tuned Solar Cells The sun has enough power to supply the whole earth with energy. But as long as renewable energy is more expensive than energy produced by coal or nuclear plants, solar energy won’t be first choice.