Electric‐Field‐Driven Reversible Conversion Between Methylammonium Lead Triiodide Perovskites and Lead Iodide at Elevated Temperatures

Electrically driven reversible structural conversion between the MAPbI3 and PbI2 phase in MAPbI3 at 330 K is first reported, which provides insights into the intrinsic stability and chemical activities of MAPbI3 materials. Meanwhile, direct visualization of the macro­scopic migration of iodine anions is also reported for the first time, which provides strong evidence for the iodine ions migration. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.