New hybrid perovskites as multifunctional materials

Hybrid organic-inorganic perovskites are a quickly expanding group of functional materials that are derived from compounds of the АВХ3 type. The organic cations occupy the cationic positions A, while the anionic part of ВХ3 composes metal halide framework. The addition of organic components to hybrid perovskites leads to structural diversity of these materials and emergence of a range of functional properties.
Currently, the most studied and widely used hybrid perovskite is MAPbI3 (MA = methylammonium). This semiconductor has a bandgap of 1.5-1.6 eV and displays appealing functional physical properties such as high absorption coefficient, long carrier diffusion length, and high carrier mobility that make it ideal for use as an active layer in efficient solar cells. The wave of hybrid perovskite research towards photovoltaic applications started in 2009 when MAPbX3 was first used for production of a solar cell. By replacing MA with FA (FA = formamidinium), a FAPbI3 perovskite with a slightly lower bandgap was formed. The highest efficiency of 25.7% was recently achieved with a solar cell based on FAPbI3. Additionally, hybrid perovskites show promise as materials for the production of lasers, light emitting diodes, photodetectors, for water splitting, and other applications. During the development of this research direction numerous new 2D and 1D perovskite-like compounds were obtained, but 3D lead halide hybrid perovskites still exhibit the most attractive high conductivity and high conversion rates. However, due to structural constrains, the set of cations available to support 3D perovskite structure is strongly limited. In 2022 our team has found that aziridinium cation (AzrH) supports the formation of 3D (ArzH)PbX3 (X = Cl-, Br-, I-) perovskites. This project is dedicated to the development and investigation of new aziridinium based hybrid perovskites, determining their crystal structures and optical properties, as well as obtaining functional materials on their basis (quantum dots, thin films). The obtained series of new semiconducting materials will expand the range of studied hybrid perovskites for photovoltaic and optoelectronic applications