Study On Preparation And Properties Of Organic-Inorganic Hybrid Perovskite

As a new energy material,perovskite has advantages such as high absorption coefficient,high carrier mobility,long diffusion length,and adjustable direct bandgap,which make it suitable for solar cells,field-effect transistors,LED,The fields of photodetectors and lasers have broad application prospects.In general,whether a material can exist stably and be used continuously is an evaluation standard for whether the material can be used commercially,but the perovskite material's ionic nature makes its stability very poor,including light stability.Therefore,it is very important to deeply investigate how light affects the growth of perovskite crystals and device performance.In this paper,we systematically studied the effect of light on the growth process and application of perovskite materials,and for the first time prepared an in-situ synthesis of organic-inorganic hybrid perovskite fibers with good stability film.The main work of this paper includes:(1)Taking organic-inorganic hybrid perovskite single crystal as the research object,systematically explored the influence of light on its growth process and performance.Found that the external light inhibits the nucleation of perovskite crystals and promotes the growth of crystals.Using spectroscopy and morphology and other characterization methods,the process of nucleation and growth of perovskite single crystals in solution and its dynamics are clarified It has put forward the theory of “photo-inhibiting crystal nucleation”,which laid a theoretical foundation for the research and application of light-induced perovskite single crystal growth.(2)Based on the theoretical method of light-induced enhanced perovskite crystal growth,the external light conditions are introduced in the preparation process of perovskite thin-film batteries,the photoelectric conversion efficiency of perovskite solar thin-film devices is significantly improved,and can be achieved multiple times Repeated fabrication further confirmed the light-induced perovskite crystal growth and application.(3)Electrostatic spinning technology is used to wrap the perovskite material in superhydrophobic polystyrene to improve the stability of the perovskite material.In this paper,the process conditions of electrospinning are explored in detail,including spinning solution concentration,spinning voltage,pushing speed,etc.,and the best spinning conditions are obtained;by introducing perovskite into the spinning solution,A super-hydrophobic perovskite/polystyrene fiber film was prepared,which not only significantly improved the stability of perovskite but also endowed polystyrene with fluorescent properties.Then,the water stability,thermal stability,and light stability of the spun fibers were explored in detail through fluorescence spectroscopy.Finally,the fiber film was prepared as a white LED to demonstrate the commercial value of the material.