The sun is the oldest deity worshipped by humans for good reason. "It is the best and cleanest source of energy we know," says physicist Niyazi Serdar Sariciftci. For the last 30 years, Sariciftci has been working on the question of how solar energy can be used in an efficient and eco-friendly way. In his research, Sariciftci - winner of the FWF Wittgenstein Award - focuses on the development of organic solar cells.