Synthesis And Characterization Of Low-dimensional Halide Perovskites

With the increasing consumption of fossil fuels and the growing environment pollution,there is an urgent need to develop sustainable clean energy.Organic-inorganic hybrid perovskites have attracted more and more attention in recent years due to their excellent optoelectronic properties.It's important to note that the solar cells based on MAPbI₃ or FAPbI₃ have high photoelectric conversion efficiency,compared with traditional silicon solar cells.However,the potential toxicology issue of lead became a problem that hinders the commercial applications of perovskite solar cells.And the stability of these materials also became a bottleneck.So that,it's urgent for us to find the new lead-free perovskite materials to replace lead halide perovskites.As a adjacent element of lead in the periodic table,bismuth can be regarded as the effective substitution of lead in perovskite materials.According to the recent research,the bismuth-based perovskite solar cells all achieved lower efficiency,and the exploration of optoelectronics based on bismuth perovskite is still very limited.Organic-inorganic perovskites have more diversity due to the introduction of organic components.Although lead-halide perovskites formed by various other amines have also been used in many applications,the research on organic-inorganic bismuth halide perovskites is still very limited,and related research is mainly focused on MA₃Bi₂I₉ thin film perovskite solar cells.This experiment attempts to synthesis and characterization of bismuth-based perovskites nanomaterials and single crystals.Here,my experiment synthesized the corresponding perovskite materials by introducing some new amine groups such as phenethylamine,triethylamine and so on.Low-dimensional?PEA?₃Bi₂I₉ nanomaterials were prepared by introducing ligand to regulate the morphology.The photoelectric properties of these materials were characterized and the related optoelectronic devices were prepared by adjusting their morphology.In addition,high-quality bismuth-based perovskite single crystals were prepared and characterized by introducing some simple methods.A useful exploration in the direction of material synthesis provides an inspiration for the discovery and exploration of new bismuth-based perovskite materials.This paper discusses the significance of long organic cations and their effects on structures,as well as the optical and physical properties of two-dimensional perovskites,and also explores the use of these materials for photovoltaic applications.At the end,this paper discusses the influence of ligand on the morphology of the material.