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Perovskite-based solar cells are promising due to their rapidly improvingefficiencies, but suffer from instability issues. Recently it has been claimedthat one of the key contributors to the instability of perovskite solar cellsis ion migration induced electrode degradation, which can be avoided byincorporating inorganic hole blocking layers (HBL) in the device architecture.In this work, we investigate the operational environmental stability ofmethylammonium lead iodide (MAPbI3) perovskite solar cells that contain eitheran inorganic or organic HBL, with only the former effectively blocking ionsfrom migrating to the metal electrode. This is confirmed by X-ray photoemissionspectroscopy measured on electrodes of degraded devices, where only electrodesof devices with an organic HBL show a significant iodine signal. Despite this,we show that when these devices are degraded under realistic operationalconditions (i.e. constant illumination in a variety of atmospheric conditions),both types of devices exhibit nearly identical degradation behavior. Theseresults demonstrate that contrary to prior suggestions, ion-induced electrodedegradation is not the dominant factor in perovskite environmental instabilityunder operational conditions.

Effect of Ion Migration Induced Electrode Degradation on the Operational Stability of Perovskite Solar Cells