Methylammonium lead triiodide (MAPbI<sub>3</sub>) perovskites are a promising new material for solar cells that have comparable power conversion efficiency to commercial solar cells but with a lower anticipated cost. Since their potential began to be recognized in 2005, one of the greatest challenges has been how fast their performance degrades in ambient conditions. Depending on the sample, the power conversion efficiency drops and the perovskites turn gray or yellow in as little as an hour. Recently, some groups retained high efficiency even in outdoor conditions by applying a coating that prevents ambient exposure. However, the underlying mechanisms of the perovskite degradation are still unclear. Here, we present our results on pure MAPbI<sub>3</sub> perovskite crystals exposed to controlled doses of oxygen and water at controlled temperatures and analyze the products through mass spectrometry.

Analysis of Perovskite and its degradation mechanisms in ambient conditions

253rd National Meeting (2017)

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