Nature Communications (May 2017)
Structure and interstitial iodide migration in hybrid perovskite methylammonium lead iodide
Abstract
The mechanism underpinning the photovoltaic effect in hybrid perovskite solar cells has remained unclear. Here, Green and co-workers suggest that iodide ions in methylammonium lead iodide perovskite migrate via interstitial sites and undergo a redox reaction to form molecular iodine and free electrons.