Synthesis of Hybrid to Inorganic Quasi 2D-Layered Perovskite Nanoparticles

摘要

Metal halide perovskites have emerged as a potential candidate for photovoltaic and light emitting applications. Tuning the optical properties by tailoring the perovskite nanostructures could enhance the efficiency of these devices. Herein, we report the synthesis of hybrid to inorganic quasi-2D perovskites, by using different ratios of PhNH3Br and CsI, to prepare (Cs)x(PhNH3)-(2-2x)PbBr_(4-x)I_x nanomaterials. The as-prepared nanostructures were characterized by powder X-ray diffraction (p- XRD), Fourier transform infrared spectroscopy (FTIR) and ultraviolet- visible spectroscopy (UV/Vis). Transmission electron microscopy (TEM) showed that the shape of the as-prepared nanostructures can be tuned from rectangle/rods to sheet like structures. It was observed that the ratio of the organic cation (anilinium ion) plays a crucial role in the development of the perovskite crystallites size and shape. This is the first such study on the conversion of hybrid 2D perovskite to inorganic quasi- 2D perovskite by using inorganic cation (Cs~+) and could be a potential material for optoelectronic applications.