title: Probe Decomposition of Methylammonium Lead Iodide Perovskite in N2and O2by in Situ Infrared Spectroscopy.
abstract: Packaging methylammonium lead iodide perovskite (MAPbI3)-based solar cells with N2or dry air is a promising solution for its application in outdoor photovoltaics. However, the effect of N2and O2on the decomposition chemistry and kinetics of MAPbI3is not yet well-understood. With in situ Fourier transform infrared spectroscopy measurements, we show that the effective activation energy for the degradation of MAPbI3in N2is ∼120 kJ/mol. The decomposition of MAPbI3is greatly accelerated by exposure to O2in the dark. As a result of the synergistic effect between O2and 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 MAPbI3to ∼50 kJ/mol. The solid decomposition products after annealing in N2and O2at 150 °C or below do not have absorbance between 650 and 4000 cm-1.
authors.affiliation: Chemical and Biological Engineering Department, University of Alabama , P.O. Box 870203, Tuscaloosa, Alabama 35487, United States.
authors.forename: Xiaozhou
authors.initials: X
authors.lastname: Yu
authors.affiliation: Alabama Innovation and Mentoring of Entrepreneurs, University of Alabama , P.O. Box 870204, Tuscaloosa, Alabama 35401, United States.
authors.forename: Ying
authors.initials: Y
authors.lastname: Qin
authors.affiliation: Chemical and Biological Engineering Department, University of Alabama , P.O. Box 870203, Tuscaloosa, Alabama 35487, United States.
authors.forename: Qing
authors.identifier: http://orcid.org/0000-0001-9582-179X
authors.initials: Q
authors.lastname: Peng