Probe Decomposition of Methylammonium Lead Iodide Perovskite in N2 and O2 by in Situ Infrared Spectroscopy

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• 作者：Xiaozhou Yu ; Ying Qin ; Qing Peng
• 刊名：Journal of Physical Chemistry A
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：121
• 期：6
• 页码：1169-1174
• 全文大小：373K
• ISSN：1520-5215

文摘

Packaging methylammonium lead iodide perovskite (MAPbI₃)-based solar cells with N₂ or dry air is a promising solution for its application in outdoor photovoltaics. However, the effect of N₂ and O₂ on the decomposition chemistry and kinetics of MAPbI₃ is not yet well-understood. With in situ Fourier transform infrared spectroscopy measurements, we show that the effective activation energy for the degradation of MAPbI₃ in N₂ is ∼120 kJ/mol. The decomposition of MAPbI₃ is greatly accelerated by exposure to O₂ in the dark. As a result of the synergistic effect between O₂ and a HeNe laser (633 nm), the degradation rate is further increased with photon flux. This synergistic effect reduces the effective activation energy of degradation of MAPbI₃ to ∼50 kJ/mol. The solid decomposition products after annealing in N₂ and O₂ at 150 °C or below do not have absorbance between 650 and 4000 cm^–1.