Fig. 2 (IMAGE) Kanazawa University Caption Top view SEM images of a) a pristine MAPbI3 film, and perovskite films with b) up layer, c) down layer and d) double layer CsI intercalation. Credit Kanazawa University Usage Restrictions The image may only be used with appropriate caption and credit. License Original 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.