Li, Xiaotong; Ke, Weijun; Traore, Boubacar; Guo, Peijun; Hadar, Ido; Kepenekian, Mikael; Even, Jacky; Katan, Claudine; Stoumpos, Constantinos C.; Schaller, Richard D.; Kanatzidis, Mercouri G. published the artcile< Two-Dimensional Dion-Jacobson Hybrid Lead Iodide Perovskites with Aromatic Diammonium Cations>, Reference of 3731-53-1, the main research area is aminomethylpyridinium methylammonium lead iodide perovskite luminescence crystal structure.
Two-dimensional (2D) halide perovskites have extraordinary optoelectronic properties and structural tunability. Among them, the Dion-Jacobson phases with the inorganic layers stacking exactly on top of each other are less explored. Two-dimensional (2D) Dion-Jacobson halide perovskites are presented, which adopt the general formula of A’An-1PbnI3n+1 (A’ = 4-(aminomethyl)pyridinium (4AMPY), A = methylammonium (MA), n = 1-4). By modifying the position of the CH2NH3+ group from 4AMPY to 3AMPY (3AMPY = 3-(aminomethyl)pyridinium), the stacking of the inorganic layers changes from exactly eclipsed to slightly offset. The perovskite octahedra tilts are also different between the 2 series, with the 3AMPY series exhibiting smaller bandgaps than the 4AMPY series. Compared to the aliphatic cation of the same size (AMP = (aminomethyl)piperidinium), the aromatic spacers increase the rigidity of the cation, reduce the interlayer spacing, and decrease the dielec. mismatch between inorganic layer and the organic spacer, showing the indirect but powerful influence of the organic cations on the structure and consequently on the optical properties of the perovskite materials. All A’An-1PbnI3n+1 compounds exhibit strong luminescence (PL) at room temperature Preliminary solar cell devices based on the n = 4 perovskites as absorbers of both series exhibit promising performances, with a champion power conversion efficiency (PCE) of 9.20% for (3AMPY)(MA)3Pb4I13-based devices, which is higher than the (4AMPY)(MA)3Pb4I13 and the corresponding aliphatic analog (3AMP)(MA)3Pb4I13-based ones.
Journal of the American Chemical Society published new progress about Band gap. 3731-53-1 belongs to class pyridine-derivatives, and the molecular formula is C6H8N2, Reference of 3731-53-1.