Now a team at Eindhoven University of Technology (TU/e) is using a similar system to produce chemicals, which could one day lead to solar-powered "mini-factories" that can produce drugs, pesticides and other chemicals almost anywhere.

To mimic the light-capturing molecules in leaves, the researchers turned to luminescent solar concentrators (LSCs), materials seen in solar-harvesting window technology and used to catch and amplify laser beams carrying data in Facebook's drone-mounted internet project. These LSCs absorb incoming light, convert it to specific wavelengths and then guide the photons to the edges of the device.

The TU/e team's take on the idea was to create a leaf-shaped device, made from a silicon rubber LSC, with a thin channel running through it like the veins in a leaf. As chemicals are pumped through the channel, the LSC material directs sunlight towards it, and the high intensity of the sunlight can trigger a chemical reaction with the liquid in the channel. Essentially, one substance enters, and by the time it comes out the other end, the device will have converted it into a different chemical, which may be useful as a drug, fuel or other agent.