Water Infiltration in Methylammonium Lead Iodide Perovskite: Fast and Inconspicuous

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• 作者：Christian M眉ller ; Tobias Glaser ; Marcel Plogmeyer ; Michael Sendner ; Sebastian D枚ring ; Artem A. Bakulin ; Carlo Brzuska ; Roland Scheer ; Maxim S. Pshenichnikov ; Wolfgang Kowalsky ; Annemarie Pucci ; Robert Lovrin膷i膰
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：November 24, 2015
• 年：2015
• 卷：27
• 期：22
• 页码：7835-7841
• 全文大小：374K
• ISSN：1520-5002

文摘

While the susceptibility of CH₃NH₃PbI₃ to water is well-documented, the influence of water on device performance is not well-understood. Herein, we use infrared spectroscopy to show that water infiltration into CH₃NH₃PbI₃ occurs much faster and at a humidity much lower than previously thought. We propose a molecular model in which water molecules have a strong effect on the hydrogen bonding between the methylammonium cations and the Pb鈥揑 cage. Furthermore, the exposure of CH₃NH₃PbI₃ to the ambient environment increases the photocurrent of films in lateral devices by more than 1 order of magnitude. The observed slow component in the photocurrent buildup indicates that the effect is associated with enhanced proton conduction when light is combined with water and oxygen exposure.