Bismuth Enhances the Stability of CH 3 NH 3 PbI 3 (MAPI) Perovskite under High Humidity

This is the authors' abstract. We don't add key points for this paper.

Methylammonium lead iodide (CH 3 NH 3 PbI 3, MAPI) is a high-performance solar cell material but lacks stability in the presence of humidity. Addition of a few percent bismuth (Bi) as a trivalent cation substitute for Pb (i.e., MAP(Bi)I) leads to enhanced stability under high (90%) relative humidity (RH). At moderate humidity (60% RH), however, MAP(Bi)I degrades more rapidly than MAPI. Bi incorporation into MAPI either stabilizes or destabilizes the two hydration products, MAPI·H 2 O and PbI 2, depending on the amount of humidity in the environment.