Lead-free Perovskite Solar Cell (IMAGE) Brown University Caption Researchers have shown that titanium is an attractive choice to replace the toxic lead in the prevailing perovskite thin film solar cells. Credit Padture Lab / Brown University Usage Restrictions None 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.