Scientists at the University of Sydney in Australia have created molecules that mimic those in plants which harvest light. “A leaf is an amazingly cheap and efficient solar cell,” says Dr Deanna D’Alessandro, a postdoctoral researcher in the Molecular Electronics Group at the University of Sydney. “The best leaves can harvest 30 to 40 percent of the light falling on them. The best solar cells we can build are between 15 and 20 percent efficient, and expensive to make. We’ve recreated some of the key systems that plants use in photosynthesis,” says Deanna.