Single Molecule Solar Cell (IMAGE) Technical University of Munich (TUM) Caption Photosystem-I (green) is optically excited by an electrode (top). An electron then is transferred step by step in only 16 nanoseconds. Credit Christoph Hohmann (Nanosystems Initiative Munich) Usage Restrictions None License Licensed content 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.