Phase Segregation in FACsPbI3 Perovskite (IMAGE) Eindhoven University of Technology Caption The atomic structure of mixed FACsPbI3 perovskite, where it separates into two CsPbI3 (green region) and FAPbI3 clusters under light excitation. Credit Shuxia Tao (TU/e) Usage Restrictions Please credit Shuxia Tao (TU/e) 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.