Generation of Charge Pairs (IMAGE) Technische Universität Dresden Caption Illustration of the generation of charge pairs (excitons), the precursors of free charge carriers in the active layer of an organic solar cell. Free charge carriers then generate an electric voltage at the contacts of the cell. The lower image section shows a microscopic model of the organic thin film. Credit Credit: M. Panhans 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.