Integrated Artificial Photosynthesis Nanosystem (image) DOE/Lawrence Berkeley National Laboratory Caption This is a schematic of the nanoscale tree-like heterostructures used for solar-driven water splitting in which TiO2 nanowires (blue) are grown on the upper half of a Si nanowire (gray), and the two semiconductors absorb different regions of the solar spectrum. Insets display photoexcited electron-hole pairs separated at the semiconductor-electrolyte interface to carry out water splitting with the help of co-catalysts (yellow and gray dots). Credit Image from Peidong Yang group/Berkeley Lab and UC Berkeley Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.