Fig. 1 (IMAGE) Kanazawa University Caption Normalized PCE versus time for unencapsulated PSCs stored in the dark under ambient air without a UV filter at the 40–50% RH. Inset diagram shows the change in perovskite crystal structure after 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.