Perovskite Efficiency (IMAGE) Massachusetts Institute of Technology Caption Solar cells made of perovskite have great promise, in part because they can easily be made on flexible substrates, like this experimental cell. Credit Ken Richardson Usage Restrictions Images are made available to non-commercial entities, press and the general public under a Creative Commons Attribution Non-Commercial No Derivatives license. You may not alter the images provided, other than to crop them to size. A credit line must be used when reproducing images. 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.