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Enhancing the Optical Properties of MAPbI3 Perovskites Passivated with Coordinating and Hydrogen Bond Donor Ligands
Matthieu Gamarde1,2,3, Abdelaziz Jouaiti1, Daniel Chartrand4
1CMC UMR 7140, CNRS-Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, Strasbourg Cedex 67081, France.
Abstract:
MAPbI 3 (MA; methylammonium) perovskite films were treated with both fluorinated (trifluoroacetamidine, TFA, and trifluoroacetamide, TFAM) and nonfluorinated (oxamide, Oxa) hydrogen bond donors as additives. The corresponding films named Oxa-MAPbI 3 , TFA-MAPbI 3 , and TFAM-MAPbI 3 were thoroughly characterized to evaluate the influence of the type of additive on the structure, morphology, thermal stability, and optical properties of the resulting films. Powder X-ray diffraction (PXRD) studies confirmed the preservation of the MAPbI 3 perovskite structure for the three types of additives. The decomposition kinetics at 100 °C in air highlight the high thermal stability of the TFAM-MAPbI 3 film, compared to the behavior of films treated with other additives. An increase in binding energy was observed by XPS for the additives owing to their perturbation of Pb2+. MAPbI3 perovskite films containing different additives exhibited similar emissions as the MAPbI3 pristine films; however, their excited-state lifetimes were increased by roughly 40%.
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