Michael Grätzel, a Swiss chemist, and his group developed a photovoltaic device using perovskites which are cheap and abundant materials. This device is used to break water into hydrogen and oxygen using sunlight.
Grätzel's gadget improves the efficiency and price of previous aproaches using silicon. But more work is needed on the durability and stability of the solar cells.
Written by Marisol, Noa and Sofía (3rd ESO - 9th grade).