Perovskite Photoluminescence (IMAGE) University of California - San Diego Caption The inside back cover image of the Nov. 20, 2017 issue of Advanced Materials illustrates how ion migration in a hybrid perovskite crystal affects solar cell performance in different areas of the crystal. Credit AMOLF Usage Restrictions Please credit: AMOLF 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.